drivers/char: minor irq handler cleanups
[linux-2.6.git] / drivers / char / synclink_gt.c
1 /*
2  * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
3  *
4  * Device driver for Microgate SyncLink GT serial adapters.
5  *
6  * written by Paul Fulghum for Microgate Corporation
7  * paulkf@microgate.com
8  *
9  * Microgate and SyncLink are trademarks of Microgate Corporation
10  *
11  * This code is released under the GNU General Public License (GPL)
12  *
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23  * OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 /*
27  * DEBUG OUTPUT DEFINITIONS
28  *
29  * uncomment lines below to enable specific types of debug output
30  *
31  * DBGINFO   information - most verbose output
32  * DBGERR    serious errors
33  * DBGBH     bottom half service routine debugging
34  * DBGISR    interrupt service routine debugging
35  * DBGDATA   output receive and transmit data
36  * DBGTBUF   output transmit DMA buffers and registers
37  * DBGRBUF   output receive DMA buffers and registers
38  */
39
40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45 //#define DBGTBUF(info) dump_tbufs(info)
46 //#define DBGRBUF(info) dump_rbufs(info)
47
48
49 #include <linux/module.h>
50 #include <linux/version.h>
51 #include <linux/errno.h>
52 #include <linux/signal.h>
53 #include <linux/sched.h>
54 #include <linux/timer.h>
55 #include <linux/interrupt.h>
56 #include <linux/pci.h>
57 #include <linux/tty.h>
58 #include <linux/tty_flip.h>
59 #include <linux/serial.h>
60 #include <linux/major.h>
61 #include <linux/string.h>
62 #include <linux/fcntl.h>
63 #include <linux/ptrace.h>
64 #include <linux/ioport.h>
65 #include <linux/mm.h>
66 #include <linux/slab.h>
67 #include <linux/netdevice.h>
68 #include <linux/vmalloc.h>
69 #include <linux/init.h>
70 #include <linux/delay.h>
71 #include <linux/ioctl.h>
72 #include <linux/termios.h>
73 #include <linux/bitops.h>
74 #include <linux/workqueue.h>
75 #include <linux/hdlc.h>
76 #include <linux/synclink.h>
77
78 #include <asm/system.h>
79 #include <asm/io.h>
80 #include <asm/irq.h>
81 #include <asm/dma.h>
82 #include <asm/types.h>
83 #include <asm/uaccess.h>
84
85 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
86 #define SYNCLINK_GENERIC_HDLC 1
87 #else
88 #define SYNCLINK_GENERIC_HDLC 0
89 #endif
90
91 /*
92  * module identification
93  */
94 static char *driver_name     = "SyncLink GT";
95 static char *driver_version  = "$Revision: 4.50 $";
96 static char *tty_driver_name = "synclink_gt";
97 static char *tty_dev_prefix  = "ttySLG";
98 MODULE_LICENSE("GPL");
99 #define MGSL_MAGIC 0x5401
100 #define MAX_DEVICES 32
101
102 static struct pci_device_id pci_table[] = {
103         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107         {0,}, /* terminate list */
108 };
109 MODULE_DEVICE_TABLE(pci, pci_table);
110
111 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
112 static void remove_one(struct pci_dev *dev);
113 static struct pci_driver pci_driver = {
114         .name           = "synclink_gt",
115         .id_table       = pci_table,
116         .probe          = init_one,
117         .remove         = __devexit_p(remove_one),
118 };
119
120 static int pci_registered;
121
122 /*
123  * module configuration and status
124  */
125 static struct slgt_info *slgt_device_list;
126 static int slgt_device_count;
127
128 static int ttymajor;
129 static int debug_level;
130 static int maxframe[MAX_DEVICES];
131 static int dosyncppp[MAX_DEVICES];
132
133 module_param(ttymajor, int, 0);
134 module_param(debug_level, int, 0);
135 module_param_array(maxframe, int, NULL, 0);
136 module_param_array(dosyncppp, int, NULL, 0);
137
138 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
139 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
140 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
141 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
142
143 /*
144  * tty support and callbacks
145  */
146 static struct tty_driver *serial_driver;
147
148 static int  open(struct tty_struct *tty, struct file * filp);
149 static void close(struct tty_struct *tty, struct file * filp);
150 static void hangup(struct tty_struct *tty);
151 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
152
153 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
154 static void put_char(struct tty_struct *tty, unsigned char ch);
155 static void send_xchar(struct tty_struct *tty, char ch);
156 static void wait_until_sent(struct tty_struct *tty, int timeout);
157 static int  write_room(struct tty_struct *tty);
158 static void flush_chars(struct tty_struct *tty);
159 static void flush_buffer(struct tty_struct *tty);
160 static void tx_hold(struct tty_struct *tty);
161 static void tx_release(struct tty_struct *tty);
162
163 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
164 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
165 static int  chars_in_buffer(struct tty_struct *tty);
166 static void throttle(struct tty_struct * tty);
167 static void unthrottle(struct tty_struct * tty);
168 static void set_break(struct tty_struct *tty, int break_state);
169
170 /*
171  * generic HDLC support and callbacks
172  */
173 #if SYNCLINK_GENERIC_HDLC
174 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
175 static void hdlcdev_tx_done(struct slgt_info *info);
176 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
177 static int  hdlcdev_init(struct slgt_info *info);
178 static void hdlcdev_exit(struct slgt_info *info);
179 #endif
180
181
182 /*
183  * device specific structures, macros and functions
184  */
185
186 #define SLGT_MAX_PORTS 4
187 #define SLGT_REG_SIZE  256
188
189 /*
190  * conditional wait facility
191  */
192 struct cond_wait {
193         struct cond_wait *next;
194         wait_queue_head_t q;
195         wait_queue_t wait;
196         unsigned int data;
197 };
198 static void init_cond_wait(struct cond_wait *w, unsigned int data);
199 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
200 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
201 static void flush_cond_wait(struct cond_wait **head);
202
203 /*
204  * DMA buffer descriptor and access macros
205  */
206 struct slgt_desc
207 {
208         __le16 count;
209         __le16 status;
210         __le32 pbuf;  /* physical address of data buffer */
211         __le32 next;  /* physical address of next descriptor */
212
213         /* driver book keeping */
214         char *buf;          /* virtual  address of data buffer */
215         unsigned int pdesc; /* physical address of this descriptor */
216         dma_addr_t buf_dma_addr;
217 };
218
219 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
220 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
221 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
222 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
223 #define desc_count(a)      (le16_to_cpu((a).count))
224 #define desc_status(a)     (le16_to_cpu((a).status))
225 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
226 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
227 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
228 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
229 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
230
231 struct _input_signal_events {
232         int ri_up;
233         int ri_down;
234         int dsr_up;
235         int dsr_down;
236         int dcd_up;
237         int dcd_down;
238         int cts_up;
239         int cts_down;
240 };
241
242 /*
243  * device instance data structure
244  */
245 struct slgt_info {
246         void *if_ptr;           /* General purpose pointer (used by SPPP) */
247
248         struct slgt_info *next_device;  /* device list link */
249
250         int magic;
251         int flags;
252
253         char device_name[25];
254         struct pci_dev *pdev;
255
256         int port_count;  /* count of ports on adapter */
257         int adapter_num; /* adapter instance number */
258         int port_num;    /* port instance number */
259
260         /* array of pointers to port contexts on this adapter */
261         struct slgt_info *port_array[SLGT_MAX_PORTS];
262
263         int                     count;          /* count of opens */
264         int                     line;           /* tty line instance number */
265         unsigned short          close_delay;
266         unsigned short          closing_wait;   /* time to wait before closing */
267
268         struct mgsl_icount      icount;
269
270         struct tty_struct       *tty;
271         int                     timeout;
272         int                     x_char;         /* xon/xoff character */
273         int                     blocked_open;   /* # of blocked opens */
274         unsigned int            read_status_mask;
275         unsigned int            ignore_status_mask;
276
277         wait_queue_head_t       open_wait;
278         wait_queue_head_t       close_wait;
279
280         wait_queue_head_t       status_event_wait_q;
281         wait_queue_head_t       event_wait_q;
282         struct timer_list       tx_timer;
283         struct timer_list       rx_timer;
284
285         unsigned int            gpio_present;
286         struct cond_wait        *gpio_wait_q;
287
288         spinlock_t lock;        /* spinlock for synchronizing with ISR */
289
290         struct work_struct task;
291         u32 pending_bh;
292         int bh_requested;
293         int bh_running;
294
295         int isr_overflow;
296         int irq_requested;      /* nonzero if IRQ requested */
297         int irq_occurred;       /* for diagnostics use */
298
299         /* device configuration */
300
301         unsigned int bus_type;
302         unsigned int irq_level;
303         unsigned long irq_flags;
304
305         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
306         u32 phys_reg_addr;
307         int reg_addr_requested;
308
309         MGSL_PARAMS params;       /* communications parameters */
310         u32 idle_mode;
311         u32 max_frame_size;       /* as set by device config */
312
313         unsigned int raw_rx_size;
314         unsigned int if_mode;
315
316         /* device status */
317
318         int rx_enabled;
319         int rx_restart;
320
321         int tx_enabled;
322         int tx_active;
323
324         unsigned char signals;    /* serial signal states */
325         int init_error;  /* initialization error */
326
327         unsigned char *tx_buf;
328         int tx_count;
329
330         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
331         char char_buf[MAX_ASYNC_BUFFER_SIZE];
332         BOOLEAN drop_rts_on_tx_done;
333         struct  _input_signal_events    input_signal_events;
334
335         int dcd_chkcount;       /* check counts to prevent */
336         int cts_chkcount;       /* too many IRQs if a signal */
337         int dsr_chkcount;       /* is floating */
338         int ri_chkcount;
339
340         char *bufs;             /* virtual address of DMA buffer lists */
341         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
342
343         unsigned int rbuf_count;
344         struct slgt_desc *rbufs;
345         unsigned int rbuf_current;
346         unsigned int rbuf_index;
347
348         unsigned int tbuf_count;
349         struct slgt_desc *tbufs;
350         unsigned int tbuf_current;
351         unsigned int tbuf_start;
352
353         unsigned char *tmp_rbuf;
354         unsigned int tmp_rbuf_count;
355
356         /* SPPP/Cisco HDLC device parts */
357
358         int netcount;
359         int dosyncppp;
360         spinlock_t netlock;
361 #if SYNCLINK_GENERIC_HDLC
362         struct net_device *netdev;
363 #endif
364
365 };
366
367 static MGSL_PARAMS default_params = {
368         .mode            = MGSL_MODE_HDLC,
369         .loopback        = 0,
370         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
371         .encoding        = HDLC_ENCODING_NRZI_SPACE,
372         .clock_speed     = 0,
373         .addr_filter     = 0xff,
374         .crc_type        = HDLC_CRC_16_CCITT,
375         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
376         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
377         .data_rate       = 9600,
378         .data_bits       = 8,
379         .stop_bits       = 1,
380         .parity          = ASYNC_PARITY_NONE
381 };
382
383
384 #define BH_RECEIVE  1
385 #define BH_TRANSMIT 2
386 #define BH_STATUS   4
387 #define IO_PIN_SHUTDOWN_LIMIT 100
388
389 #define DMABUFSIZE 256
390 #define DESC_LIST_SIZE 4096
391
392 #define MASK_PARITY  BIT1
393 #define MASK_FRAMING BIT0
394 #define MASK_BREAK   BIT14
395 #define MASK_OVERRUN BIT4
396
397 #define GSR   0x00 /* global status */
398 #define JCR   0x04 /* JTAG control */
399 #define IODR  0x08 /* GPIO direction */
400 #define IOER  0x0c /* GPIO interrupt enable */
401 #define IOVR  0x10 /* GPIO value */
402 #define IOSR  0x14 /* GPIO interrupt status */
403 #define TDR   0x80 /* tx data */
404 #define RDR   0x80 /* rx data */
405 #define TCR   0x82 /* tx control */
406 #define TIR   0x84 /* tx idle */
407 #define TPR   0x85 /* tx preamble */
408 #define RCR   0x86 /* rx control */
409 #define VCR   0x88 /* V.24 control */
410 #define CCR   0x89 /* clock control */
411 #define BDR   0x8a /* baud divisor */
412 #define SCR   0x8c /* serial control */
413 #define SSR   0x8e /* serial status */
414 #define RDCSR 0x90 /* rx DMA control/status */
415 #define TDCSR 0x94 /* tx DMA control/status */
416 #define RDDAR 0x98 /* rx DMA descriptor address */
417 #define TDDAR 0x9c /* tx DMA descriptor address */
418
419 #define RXIDLE      BIT14
420 #define RXBREAK     BIT14
421 #define IRQ_TXDATA  BIT13
422 #define IRQ_TXIDLE  BIT12
423 #define IRQ_TXUNDER BIT11 /* HDLC */
424 #define IRQ_RXDATA  BIT10
425 #define IRQ_RXIDLE  BIT9  /* HDLC */
426 #define IRQ_RXBREAK BIT9  /* async */
427 #define IRQ_RXOVER  BIT8
428 #define IRQ_DSR     BIT7
429 #define IRQ_CTS     BIT6
430 #define IRQ_DCD     BIT5
431 #define IRQ_RI      BIT4
432 #define IRQ_ALL     0x3ff0
433 #define IRQ_MASTER  BIT0
434
435 #define slgt_irq_on(info, mask) \
436         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
437 #define slgt_irq_off(info, mask) \
438         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
439
440 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
441 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
442 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
443 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
444 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
445 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
446
447 static void  msc_set_vcr(struct slgt_info *info);
448
449 static int  startup(struct slgt_info *info);
450 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
451 static void shutdown(struct slgt_info *info);
452 static void program_hw(struct slgt_info *info);
453 static void change_params(struct slgt_info *info);
454
455 static int  register_test(struct slgt_info *info);
456 static int  irq_test(struct slgt_info *info);
457 static int  loopback_test(struct slgt_info *info);
458 static int  adapter_test(struct slgt_info *info);
459
460 static void reset_adapter(struct slgt_info *info);
461 static void reset_port(struct slgt_info *info);
462 static void async_mode(struct slgt_info *info);
463 static void sync_mode(struct slgt_info *info);
464
465 static void rx_stop(struct slgt_info *info);
466 static void rx_start(struct slgt_info *info);
467 static void reset_rbufs(struct slgt_info *info);
468 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
469 static void rdma_reset(struct slgt_info *info);
470 static int  rx_get_frame(struct slgt_info *info);
471 static int  rx_get_buf(struct slgt_info *info);
472
473 static void tx_start(struct slgt_info *info);
474 static void tx_stop(struct slgt_info *info);
475 static void tx_set_idle(struct slgt_info *info);
476 static unsigned int free_tbuf_count(struct slgt_info *info);
477 static void reset_tbufs(struct slgt_info *info);
478 static void tdma_reset(struct slgt_info *info);
479 static void tdma_start(struct slgt_info *info);
480 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
481
482 static void get_signals(struct slgt_info *info);
483 static void set_signals(struct slgt_info *info);
484 static void enable_loopback(struct slgt_info *info);
485 static void set_rate(struct slgt_info *info, u32 data_rate);
486
487 static int  bh_action(struct slgt_info *info);
488 static void bh_handler(struct work_struct *work);
489 static void bh_transmit(struct slgt_info *info);
490 static void isr_serial(struct slgt_info *info);
491 static void isr_rdma(struct slgt_info *info);
492 static void isr_txeom(struct slgt_info *info, unsigned short status);
493 static void isr_tdma(struct slgt_info *info);
494
495 static int  alloc_dma_bufs(struct slgt_info *info);
496 static void free_dma_bufs(struct slgt_info *info);
497 static int  alloc_desc(struct slgt_info *info);
498 static void free_desc(struct slgt_info *info);
499 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
500 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
501
502 static int  alloc_tmp_rbuf(struct slgt_info *info);
503 static void free_tmp_rbuf(struct slgt_info *info);
504
505 static void tx_timeout(unsigned long context);
506 static void rx_timeout(unsigned long context);
507
508 /*
509  * ioctl handlers
510  */
511 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
512 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
513 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
514 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
515 static int  set_txidle(struct slgt_info *info, int idle_mode);
516 static int  tx_enable(struct slgt_info *info, int enable);
517 static int  tx_abort(struct slgt_info *info);
518 static int  rx_enable(struct slgt_info *info, int enable);
519 static int  modem_input_wait(struct slgt_info *info,int arg);
520 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
521 static int  tiocmget(struct tty_struct *tty, struct file *file);
522 static int  tiocmset(struct tty_struct *tty, struct file *file,
523                      unsigned int set, unsigned int clear);
524 static void set_break(struct tty_struct *tty, int break_state);
525 static int  get_interface(struct slgt_info *info, int __user *if_mode);
526 static int  set_interface(struct slgt_info *info, int if_mode);
527 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
528 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
529 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
530
531 /*
532  * driver functions
533  */
534 static void add_device(struct slgt_info *info);
535 static void device_init(int adapter_num, struct pci_dev *pdev);
536 static int  claim_resources(struct slgt_info *info);
537 static void release_resources(struct slgt_info *info);
538
539 /*
540  * DEBUG OUTPUT CODE
541  */
542 #ifndef DBGINFO
543 #define DBGINFO(fmt)
544 #endif
545 #ifndef DBGERR
546 #define DBGERR(fmt)
547 #endif
548 #ifndef DBGBH
549 #define DBGBH(fmt)
550 #endif
551 #ifndef DBGISR
552 #define DBGISR(fmt)
553 #endif
554
555 #ifdef DBGDATA
556 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
557 {
558         int i;
559         int linecount;
560         printk("%s %s data:\n",info->device_name, label);
561         while(count) {
562                 linecount = (count > 16) ? 16 : count;
563                 for(i=0; i < linecount; i++)
564                         printk("%02X ",(unsigned char)data[i]);
565                 for(;i<17;i++)
566                         printk("   ");
567                 for(i=0;i<linecount;i++) {
568                         if (data[i]>=040 && data[i]<=0176)
569                                 printk("%c",data[i]);
570                         else
571                                 printk(".");
572                 }
573                 printk("\n");
574                 data  += linecount;
575                 count -= linecount;
576         }
577 }
578 #else
579 #define DBGDATA(info, buf, size, label)
580 #endif
581
582 #ifdef DBGTBUF
583 static void dump_tbufs(struct slgt_info *info)
584 {
585         int i;
586         printk("tbuf_current=%d\n", info->tbuf_current);
587         for (i=0 ; i < info->tbuf_count ; i++) {
588                 printk("%d: count=%04X status=%04X\n",
589                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
590         }
591 }
592 #else
593 #define DBGTBUF(info)
594 #endif
595
596 #ifdef DBGRBUF
597 static void dump_rbufs(struct slgt_info *info)
598 {
599         int i;
600         printk("rbuf_current=%d\n", info->rbuf_current);
601         for (i=0 ; i < info->rbuf_count ; i++) {
602                 printk("%d: count=%04X status=%04X\n",
603                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
604         }
605 }
606 #else
607 #define DBGRBUF(info)
608 #endif
609
610 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
611 {
612 #ifdef SANITY_CHECK
613         if (!info) {
614                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
615                 return 1;
616         }
617         if (info->magic != MGSL_MAGIC) {
618                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
619                 return 1;
620         }
621 #else
622         if (!info)
623                 return 1;
624 #endif
625         return 0;
626 }
627
628 /**
629  * line discipline callback wrappers
630  *
631  * The wrappers maintain line discipline references
632  * while calling into the line discipline.
633  *
634  * ldisc_receive_buf  - pass receive data to line discipline
635  */
636 static void ldisc_receive_buf(struct tty_struct *tty,
637                               const __u8 *data, char *flags, int count)
638 {
639         struct tty_ldisc *ld;
640         if (!tty)
641                 return;
642         ld = tty_ldisc_ref(tty);
643         if (ld) {
644                 if (ld->receive_buf)
645                         ld->receive_buf(tty, data, flags, count);
646                 tty_ldisc_deref(ld);
647         }
648 }
649
650 /* tty callbacks */
651
652 static int open(struct tty_struct *tty, struct file *filp)
653 {
654         struct slgt_info *info;
655         int retval, line;
656         unsigned long flags;
657
658         line = tty->index;
659         if ((line < 0) || (line >= slgt_device_count)) {
660                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
661                 return -ENODEV;
662         }
663
664         info = slgt_device_list;
665         while(info && info->line != line)
666                 info = info->next_device;
667         if (sanity_check(info, tty->name, "open"))
668                 return -ENODEV;
669         if (info->init_error) {
670                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
671                 return -ENODEV;
672         }
673
674         tty->driver_data = info;
675         info->tty = tty;
676
677         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
678
679         /* If port is closing, signal caller to try again */
680         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
681                 if (info->flags & ASYNC_CLOSING)
682                         interruptible_sleep_on(&info->close_wait);
683                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
684                         -EAGAIN : -ERESTARTSYS);
685                 goto cleanup;
686         }
687
688         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
689
690         spin_lock_irqsave(&info->netlock, flags);
691         if (info->netcount) {
692                 retval = -EBUSY;
693                 spin_unlock_irqrestore(&info->netlock, flags);
694                 goto cleanup;
695         }
696         info->count++;
697         spin_unlock_irqrestore(&info->netlock, flags);
698
699         if (info->count == 1) {
700                 /* 1st open on this device, init hardware */
701                 retval = startup(info);
702                 if (retval < 0)
703                         goto cleanup;
704         }
705
706         retval = block_til_ready(tty, filp, info);
707         if (retval) {
708                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
709                 goto cleanup;
710         }
711
712         retval = 0;
713
714 cleanup:
715         if (retval) {
716                 if (tty->count == 1)
717                         info->tty = NULL; /* tty layer will release tty struct */
718                 if(info->count)
719                         info->count--;
720         }
721
722         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
723         return retval;
724 }
725
726 static void close(struct tty_struct *tty, struct file *filp)
727 {
728         struct slgt_info *info = tty->driver_data;
729
730         if (sanity_check(info, tty->name, "close"))
731                 return;
732         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
733
734         if (!info->count)
735                 return;
736
737         if (tty_hung_up_p(filp))
738                 goto cleanup;
739
740         if ((tty->count == 1) && (info->count != 1)) {
741                 /*
742                  * tty->count is 1 and the tty structure will be freed.
743                  * info->count should be one in this case.
744                  * if it's not, correct it so that the port is shutdown.
745                  */
746                 DBGERR(("%s close: bad refcount; tty->count=1, "
747                        "info->count=%d\n", info->device_name, info->count));
748                 info->count = 1;
749         }
750
751         info->count--;
752
753         /* if at least one open remaining, leave hardware active */
754         if (info->count)
755                 goto cleanup;
756
757         info->flags |= ASYNC_CLOSING;
758
759         /* set tty->closing to notify line discipline to
760          * only process XON/XOFF characters. Only the N_TTY
761          * discipline appears to use this (ppp does not).
762          */
763         tty->closing = 1;
764
765         /* wait for transmit data to clear all layers */
766
767         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
768                 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
769                 tty_wait_until_sent(tty, info->closing_wait);
770         }
771
772         if (info->flags & ASYNC_INITIALIZED)
773                 wait_until_sent(tty, info->timeout);
774         if (tty->driver->flush_buffer)
775                 tty->driver->flush_buffer(tty);
776         tty_ldisc_flush(tty);
777
778         shutdown(info);
779
780         tty->closing = 0;
781         info->tty = NULL;
782
783         if (info->blocked_open) {
784                 if (info->close_delay) {
785                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
786                 }
787                 wake_up_interruptible(&info->open_wait);
788         }
789
790         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
791
792         wake_up_interruptible(&info->close_wait);
793
794 cleanup:
795         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
796 }
797
798 static void hangup(struct tty_struct *tty)
799 {
800         struct slgt_info *info = tty->driver_data;
801
802         if (sanity_check(info, tty->name, "hangup"))
803                 return;
804         DBGINFO(("%s hangup\n", info->device_name));
805
806         flush_buffer(tty);
807         shutdown(info);
808
809         info->count = 0;
810         info->flags &= ~ASYNC_NORMAL_ACTIVE;
811         info->tty = NULL;
812
813         wake_up_interruptible(&info->open_wait);
814 }
815
816 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
817 {
818         struct slgt_info *info = tty->driver_data;
819         unsigned long flags;
820
821         DBGINFO(("%s set_termios\n", tty->driver->name));
822
823         change_params(info);
824
825         /* Handle transition to B0 status */
826         if (old_termios->c_cflag & CBAUD &&
827             !(tty->termios->c_cflag & CBAUD)) {
828                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
829                 spin_lock_irqsave(&info->lock,flags);
830                 set_signals(info);
831                 spin_unlock_irqrestore(&info->lock,flags);
832         }
833
834         /* Handle transition away from B0 status */
835         if (!(old_termios->c_cflag & CBAUD) &&
836             tty->termios->c_cflag & CBAUD) {
837                 info->signals |= SerialSignal_DTR;
838                 if (!(tty->termios->c_cflag & CRTSCTS) ||
839                     !test_bit(TTY_THROTTLED, &tty->flags)) {
840                         info->signals |= SerialSignal_RTS;
841                 }
842                 spin_lock_irqsave(&info->lock,flags);
843                 set_signals(info);
844                 spin_unlock_irqrestore(&info->lock,flags);
845         }
846
847         /* Handle turning off CRTSCTS */
848         if (old_termios->c_cflag & CRTSCTS &&
849             !(tty->termios->c_cflag & CRTSCTS)) {
850                 tty->hw_stopped = 0;
851                 tx_release(tty);
852         }
853 }
854
855 static int write(struct tty_struct *tty,
856                  const unsigned char *buf, int count)
857 {
858         int ret = 0;
859         struct slgt_info *info = tty->driver_data;
860         unsigned long flags;
861
862         if (sanity_check(info, tty->name, "write"))
863                 goto cleanup;
864         DBGINFO(("%s write count=%d\n", info->device_name, count));
865
866         if (!info->tx_buf)
867                 goto cleanup;
868
869         if (count > info->max_frame_size) {
870                 ret = -EIO;
871                 goto cleanup;
872         }
873
874         if (!count)
875                 goto cleanup;
876
877         if (info->params.mode == MGSL_MODE_RAW ||
878             info->params.mode == MGSL_MODE_MONOSYNC ||
879             info->params.mode == MGSL_MODE_BISYNC) {
880                 unsigned int bufs_needed = (count/DMABUFSIZE);
881                 unsigned int bufs_free = free_tbuf_count(info);
882                 if (count % DMABUFSIZE)
883                         ++bufs_needed;
884                 if (bufs_needed > bufs_free)
885                         goto cleanup;
886         } else {
887                 if (info->tx_active)
888                         goto cleanup;
889                 if (info->tx_count) {
890                         /* send accumulated data from send_char() calls */
891                         /* as frame and wait before accepting more data. */
892                         tx_load(info, info->tx_buf, info->tx_count);
893                         goto start;
894                 }
895         }
896
897         ret = info->tx_count = count;
898         tx_load(info, buf, count);
899         goto start;
900
901 start:
902         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
903                 spin_lock_irqsave(&info->lock,flags);
904                 if (!info->tx_active)
905                         tx_start(info);
906                 else
907                         tdma_start(info);
908                 spin_unlock_irqrestore(&info->lock,flags);
909         }
910
911 cleanup:
912         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
913         return ret;
914 }
915
916 static void put_char(struct tty_struct *tty, unsigned char ch)
917 {
918         struct slgt_info *info = tty->driver_data;
919         unsigned long flags;
920
921         if (sanity_check(info, tty->name, "put_char"))
922                 return;
923         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
924         if (!info->tx_buf)
925                 return;
926         spin_lock_irqsave(&info->lock,flags);
927         if (!info->tx_active && (info->tx_count < info->max_frame_size))
928                 info->tx_buf[info->tx_count++] = ch;
929         spin_unlock_irqrestore(&info->lock,flags);
930 }
931
932 static void send_xchar(struct tty_struct *tty, char ch)
933 {
934         struct slgt_info *info = tty->driver_data;
935         unsigned long flags;
936
937         if (sanity_check(info, tty->name, "send_xchar"))
938                 return;
939         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
940         info->x_char = ch;
941         if (ch) {
942                 spin_lock_irqsave(&info->lock,flags);
943                 if (!info->tx_enabled)
944                         tx_start(info);
945                 spin_unlock_irqrestore(&info->lock,flags);
946         }
947 }
948
949 static void wait_until_sent(struct tty_struct *tty, int timeout)
950 {
951         struct slgt_info *info = tty->driver_data;
952         unsigned long orig_jiffies, char_time;
953
954         if (!info )
955                 return;
956         if (sanity_check(info, tty->name, "wait_until_sent"))
957                 return;
958         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
959         if (!(info->flags & ASYNC_INITIALIZED))
960                 goto exit;
961
962         orig_jiffies = jiffies;
963
964         /* Set check interval to 1/5 of estimated time to
965          * send a character, and make it at least 1. The check
966          * interval should also be less than the timeout.
967          * Note: use tight timings here to satisfy the NIST-PCTS.
968          */
969
970         if (info->params.data_rate) {
971                 char_time = info->timeout/(32 * 5);
972                 if (!char_time)
973                         char_time++;
974         } else
975                 char_time = 1;
976
977         if (timeout)
978                 char_time = min_t(unsigned long, char_time, timeout);
979
980         while (info->tx_active) {
981                 msleep_interruptible(jiffies_to_msecs(char_time));
982                 if (signal_pending(current))
983                         break;
984                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
985                         break;
986         }
987
988 exit:
989         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
990 }
991
992 static int write_room(struct tty_struct *tty)
993 {
994         struct slgt_info *info = tty->driver_data;
995         int ret;
996
997         if (sanity_check(info, tty->name, "write_room"))
998                 return 0;
999         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1000         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
1001         return ret;
1002 }
1003
1004 static void flush_chars(struct tty_struct *tty)
1005 {
1006         struct slgt_info *info = tty->driver_data;
1007         unsigned long flags;
1008
1009         if (sanity_check(info, tty->name, "flush_chars"))
1010                 return;
1011         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1012
1013         if (info->tx_count <= 0 || tty->stopped ||
1014             tty->hw_stopped || !info->tx_buf)
1015                 return;
1016
1017         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1018
1019         spin_lock_irqsave(&info->lock,flags);
1020         if (!info->tx_active && info->tx_count) {
1021                 tx_load(info, info->tx_buf,info->tx_count);
1022                 tx_start(info);
1023         }
1024         spin_unlock_irqrestore(&info->lock,flags);
1025 }
1026
1027 static void flush_buffer(struct tty_struct *tty)
1028 {
1029         struct slgt_info *info = tty->driver_data;
1030         unsigned long flags;
1031
1032         if (sanity_check(info, tty->name, "flush_buffer"))
1033                 return;
1034         DBGINFO(("%s flush_buffer\n", info->device_name));
1035
1036         spin_lock_irqsave(&info->lock,flags);
1037         if (!info->tx_active)
1038                 info->tx_count = 0;
1039         spin_unlock_irqrestore(&info->lock,flags);
1040
1041         tty_wakeup(tty);
1042 }
1043
1044 /*
1045  * throttle (stop) transmitter
1046  */
1047 static void tx_hold(struct tty_struct *tty)
1048 {
1049         struct slgt_info *info = tty->driver_data;
1050         unsigned long flags;
1051
1052         if (sanity_check(info, tty->name, "tx_hold"))
1053                 return;
1054         DBGINFO(("%s tx_hold\n", info->device_name));
1055         spin_lock_irqsave(&info->lock,flags);
1056         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1057                 tx_stop(info);
1058         spin_unlock_irqrestore(&info->lock,flags);
1059 }
1060
1061 /*
1062  * release (start) transmitter
1063  */
1064 static void tx_release(struct tty_struct *tty)
1065 {
1066         struct slgt_info *info = tty->driver_data;
1067         unsigned long flags;
1068
1069         if (sanity_check(info, tty->name, "tx_release"))
1070                 return;
1071         DBGINFO(("%s tx_release\n", info->device_name));
1072         spin_lock_irqsave(&info->lock,flags);
1073         if (!info->tx_active && info->tx_count) {
1074                 tx_load(info, info->tx_buf, info->tx_count);
1075                 tx_start(info);
1076         }
1077         spin_unlock_irqrestore(&info->lock,flags);
1078 }
1079
1080 /*
1081  * Service an IOCTL request
1082  *
1083  * Arguments
1084  *
1085  *      tty     pointer to tty instance data
1086  *      file    pointer to associated file object for device
1087  *      cmd     IOCTL command code
1088  *      arg     command argument/context
1089  *
1090  * Return 0 if success, otherwise error code
1091  */
1092 static int ioctl(struct tty_struct *tty, struct file *file,
1093                  unsigned int cmd, unsigned long arg)
1094 {
1095         struct slgt_info *info = tty->driver_data;
1096         struct mgsl_icount cnow;        /* kernel counter temps */
1097         struct serial_icounter_struct __user *p_cuser;  /* user space */
1098         unsigned long flags;
1099         void __user *argp = (void __user *)arg;
1100
1101         if (sanity_check(info, tty->name, "ioctl"))
1102                 return -ENODEV;
1103         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1104
1105         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1106             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1107                 if (tty->flags & (1 << TTY_IO_ERROR))
1108                     return -EIO;
1109         }
1110
1111         switch (cmd) {
1112         case MGSL_IOCGPARAMS:
1113                 return get_params(info, argp);
1114         case MGSL_IOCSPARAMS:
1115                 return set_params(info, argp);
1116         case MGSL_IOCGTXIDLE:
1117                 return get_txidle(info, argp);
1118         case MGSL_IOCSTXIDLE:
1119                 return set_txidle(info, (int)arg);
1120         case MGSL_IOCTXENABLE:
1121                 return tx_enable(info, (int)arg);
1122         case MGSL_IOCRXENABLE:
1123                 return rx_enable(info, (int)arg);
1124         case MGSL_IOCTXABORT:
1125                 return tx_abort(info);
1126         case MGSL_IOCGSTATS:
1127                 return get_stats(info, argp);
1128         case MGSL_IOCWAITEVENT:
1129                 return wait_mgsl_event(info, argp);
1130         case TIOCMIWAIT:
1131                 return modem_input_wait(info,(int)arg);
1132         case MGSL_IOCGIF:
1133                 return get_interface(info, argp);
1134         case MGSL_IOCSIF:
1135                 return set_interface(info,(int)arg);
1136         case MGSL_IOCSGPIO:
1137                 return set_gpio(info, argp);
1138         case MGSL_IOCGGPIO:
1139                 return get_gpio(info, argp);
1140         case MGSL_IOCWAITGPIO:
1141                 return wait_gpio(info, argp);
1142         case TIOCGICOUNT:
1143                 spin_lock_irqsave(&info->lock,flags);
1144                 cnow = info->icount;
1145                 spin_unlock_irqrestore(&info->lock,flags);
1146                 p_cuser = argp;
1147                 if (put_user(cnow.cts, &p_cuser->cts) ||
1148                     put_user(cnow.dsr, &p_cuser->dsr) ||
1149                     put_user(cnow.rng, &p_cuser->rng) ||
1150                     put_user(cnow.dcd, &p_cuser->dcd) ||
1151                     put_user(cnow.rx, &p_cuser->rx) ||
1152                     put_user(cnow.tx, &p_cuser->tx) ||
1153                     put_user(cnow.frame, &p_cuser->frame) ||
1154                     put_user(cnow.overrun, &p_cuser->overrun) ||
1155                     put_user(cnow.parity, &p_cuser->parity) ||
1156                     put_user(cnow.brk, &p_cuser->brk) ||
1157                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1158                         return -EFAULT;
1159                 return 0;
1160         default:
1161                 return -ENOIOCTLCMD;
1162         }
1163         return 0;
1164 }
1165
1166 /*
1167  * support for 32 bit ioctl calls on 64 bit systems
1168  */
1169 #ifdef CONFIG_COMPAT
1170 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1171 {
1172         struct MGSL_PARAMS32 tmp_params;
1173
1174         DBGINFO(("%s get_params32\n", info->device_name));
1175         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1176         tmp_params.loopback        = info->params.loopback;
1177         tmp_params.flags           = info->params.flags;
1178         tmp_params.encoding        = info->params.encoding;
1179         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1180         tmp_params.addr_filter     = info->params.addr_filter;
1181         tmp_params.crc_type        = info->params.crc_type;
1182         tmp_params.preamble_length = info->params.preamble_length;
1183         tmp_params.preamble        = info->params.preamble;
1184         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1185         tmp_params.data_bits       = info->params.data_bits;
1186         tmp_params.stop_bits       = info->params.stop_bits;
1187         tmp_params.parity          = info->params.parity;
1188         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1189                 return -EFAULT;
1190         return 0;
1191 }
1192
1193 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1194 {
1195         struct MGSL_PARAMS32 tmp_params;
1196
1197         DBGINFO(("%s set_params32\n", info->device_name));
1198         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1199                 return -EFAULT;
1200
1201         spin_lock(&info->lock);
1202         info->params.mode            = tmp_params.mode;
1203         info->params.loopback        = tmp_params.loopback;
1204         info->params.flags           = tmp_params.flags;
1205         info->params.encoding        = tmp_params.encoding;
1206         info->params.clock_speed     = tmp_params.clock_speed;
1207         info->params.addr_filter     = tmp_params.addr_filter;
1208         info->params.crc_type        = tmp_params.crc_type;
1209         info->params.preamble_length = tmp_params.preamble_length;
1210         info->params.preamble        = tmp_params.preamble;
1211         info->params.data_rate       = tmp_params.data_rate;
1212         info->params.data_bits       = tmp_params.data_bits;
1213         info->params.stop_bits       = tmp_params.stop_bits;
1214         info->params.parity          = tmp_params.parity;
1215         spin_unlock(&info->lock);
1216
1217         change_params(info);
1218
1219         return 0;
1220 }
1221
1222 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1223                          unsigned int cmd, unsigned long arg)
1224 {
1225         struct slgt_info *info = tty->driver_data;
1226         int rc = -ENOIOCTLCMD;
1227
1228         if (sanity_check(info, tty->name, "compat_ioctl"))
1229                 return -ENODEV;
1230         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1231
1232         switch (cmd) {
1233
1234         case MGSL_IOCSPARAMS32:
1235                 rc = set_params32(info, compat_ptr(arg));
1236                 break;
1237
1238         case MGSL_IOCGPARAMS32:
1239                 rc = get_params32(info, compat_ptr(arg));
1240                 break;
1241
1242         case MGSL_IOCGPARAMS:
1243         case MGSL_IOCSPARAMS:
1244         case MGSL_IOCGTXIDLE:
1245         case MGSL_IOCGSTATS:
1246         case MGSL_IOCWAITEVENT:
1247         case MGSL_IOCGIF:
1248         case MGSL_IOCSGPIO:
1249         case MGSL_IOCGGPIO:
1250         case MGSL_IOCWAITGPIO:
1251         case TIOCGICOUNT:
1252                 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1253                 break;
1254
1255         case MGSL_IOCSTXIDLE:
1256         case MGSL_IOCTXENABLE:
1257         case MGSL_IOCRXENABLE:
1258         case MGSL_IOCTXABORT:
1259         case TIOCMIWAIT:
1260         case MGSL_IOCSIF:
1261                 rc = ioctl(tty, file, cmd, arg);
1262                 break;
1263         }
1264
1265         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1266         return rc;
1267 }
1268 #else
1269 #define slgt_compat_ioctl NULL
1270 #endif /* ifdef CONFIG_COMPAT */
1271
1272 /*
1273  * proc fs support
1274  */
1275 static inline int line_info(char *buf, struct slgt_info *info)
1276 {
1277         char stat_buf[30];
1278         int ret;
1279         unsigned long flags;
1280
1281         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1282                       info->device_name, info->phys_reg_addr,
1283                       info->irq_level, info->max_frame_size);
1284
1285         /* output current serial signal states */
1286         spin_lock_irqsave(&info->lock,flags);
1287         get_signals(info);
1288         spin_unlock_irqrestore(&info->lock,flags);
1289
1290         stat_buf[0] = 0;
1291         stat_buf[1] = 0;
1292         if (info->signals & SerialSignal_RTS)
1293                 strcat(stat_buf, "|RTS");
1294         if (info->signals & SerialSignal_CTS)
1295                 strcat(stat_buf, "|CTS");
1296         if (info->signals & SerialSignal_DTR)
1297                 strcat(stat_buf, "|DTR");
1298         if (info->signals & SerialSignal_DSR)
1299                 strcat(stat_buf, "|DSR");
1300         if (info->signals & SerialSignal_DCD)
1301                 strcat(stat_buf, "|CD");
1302         if (info->signals & SerialSignal_RI)
1303                 strcat(stat_buf, "|RI");
1304
1305         if (info->params.mode != MGSL_MODE_ASYNC) {
1306                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1307                                info->icount.txok, info->icount.rxok);
1308                 if (info->icount.txunder)
1309                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1310                 if (info->icount.txabort)
1311                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1312                 if (info->icount.rxshort)
1313                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1314                 if (info->icount.rxlong)
1315                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1316                 if (info->icount.rxover)
1317                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1318                 if (info->icount.rxcrc)
1319                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1320         } else {
1321                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1322                                info->icount.tx, info->icount.rx);
1323                 if (info->icount.frame)
1324                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1325                 if (info->icount.parity)
1326                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1327                 if (info->icount.brk)
1328                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1329                 if (info->icount.overrun)
1330                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1331         }
1332
1333         /* Append serial signal status to end */
1334         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1335
1336         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1337                        info->tx_active,info->bh_requested,info->bh_running,
1338                        info->pending_bh);
1339
1340         return ret;
1341 }
1342
1343 /* Called to print information about devices
1344  */
1345 static int read_proc(char *page, char **start, off_t off, int count,
1346                      int *eof, void *data)
1347 {
1348         int len = 0, l;
1349         off_t   begin = 0;
1350         struct slgt_info *info;
1351
1352         len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1353
1354         info = slgt_device_list;
1355         while( info ) {
1356                 l = line_info(page + len, info);
1357                 len += l;
1358                 if (len+begin > off+count)
1359                         goto done;
1360                 if (len+begin < off) {
1361                         begin += len;
1362                         len = 0;
1363                 }
1364                 info = info->next_device;
1365         }
1366
1367         *eof = 1;
1368 done:
1369         if (off >= len+begin)
1370                 return 0;
1371         *start = page + (off-begin);
1372         return ((count < begin+len-off) ? count : begin+len-off);
1373 }
1374
1375 /*
1376  * return count of bytes in transmit buffer
1377  */
1378 static int chars_in_buffer(struct tty_struct *tty)
1379 {
1380         struct slgt_info *info = tty->driver_data;
1381         if (sanity_check(info, tty->name, "chars_in_buffer"))
1382                 return 0;
1383         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1384         return info->tx_count;
1385 }
1386
1387 /*
1388  * signal remote device to throttle send data (our receive data)
1389  */
1390 static void throttle(struct tty_struct * tty)
1391 {
1392         struct slgt_info *info = tty->driver_data;
1393         unsigned long flags;
1394
1395         if (sanity_check(info, tty->name, "throttle"))
1396                 return;
1397         DBGINFO(("%s throttle\n", info->device_name));
1398         if (I_IXOFF(tty))
1399                 send_xchar(tty, STOP_CHAR(tty));
1400         if (tty->termios->c_cflag & CRTSCTS) {
1401                 spin_lock_irqsave(&info->lock,flags);
1402                 info->signals &= ~SerialSignal_RTS;
1403                 set_signals(info);
1404                 spin_unlock_irqrestore(&info->lock,flags);
1405         }
1406 }
1407
1408 /*
1409  * signal remote device to stop throttling send data (our receive data)
1410  */
1411 static void unthrottle(struct tty_struct * tty)
1412 {
1413         struct slgt_info *info = tty->driver_data;
1414         unsigned long flags;
1415
1416         if (sanity_check(info, tty->name, "unthrottle"))
1417                 return;
1418         DBGINFO(("%s unthrottle\n", info->device_name));
1419         if (I_IXOFF(tty)) {
1420                 if (info->x_char)
1421                         info->x_char = 0;
1422                 else
1423                         send_xchar(tty, START_CHAR(tty));
1424         }
1425         if (tty->termios->c_cflag & CRTSCTS) {
1426                 spin_lock_irqsave(&info->lock,flags);
1427                 info->signals |= SerialSignal_RTS;
1428                 set_signals(info);
1429                 spin_unlock_irqrestore(&info->lock,flags);
1430         }
1431 }
1432
1433 /*
1434  * set or clear transmit break condition
1435  * break_state  -1=set break condition, 0=clear
1436  */
1437 static void set_break(struct tty_struct *tty, int break_state)
1438 {
1439         struct slgt_info *info = tty->driver_data;
1440         unsigned short value;
1441         unsigned long flags;
1442
1443         if (sanity_check(info, tty->name, "set_break"))
1444                 return;
1445         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1446
1447         spin_lock_irqsave(&info->lock,flags);
1448         value = rd_reg16(info, TCR);
1449         if (break_state == -1)
1450                 value |= BIT6;
1451         else
1452                 value &= ~BIT6;
1453         wr_reg16(info, TCR, value);
1454         spin_unlock_irqrestore(&info->lock,flags);
1455 }
1456
1457 #if SYNCLINK_GENERIC_HDLC
1458
1459 /**
1460  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1461  * set encoding and frame check sequence (FCS) options
1462  *
1463  * dev       pointer to network device structure
1464  * encoding  serial encoding setting
1465  * parity    FCS setting
1466  *
1467  * returns 0 if success, otherwise error code
1468  */
1469 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1470                           unsigned short parity)
1471 {
1472         struct slgt_info *info = dev_to_port(dev);
1473         unsigned char  new_encoding;
1474         unsigned short new_crctype;
1475
1476         /* return error if TTY interface open */
1477         if (info->count)
1478                 return -EBUSY;
1479
1480         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1481
1482         switch (encoding)
1483         {
1484         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1485         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1486         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1487         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1488         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1489         default: return -EINVAL;
1490         }
1491
1492         switch (parity)
1493         {
1494         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1495         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1496         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1497         default: return -EINVAL;
1498         }
1499
1500         info->params.encoding = new_encoding;
1501         info->params.crc_type = new_crctype;
1502
1503         /* if network interface up, reprogram hardware */
1504         if (info->netcount)
1505                 program_hw(info);
1506
1507         return 0;
1508 }
1509
1510 /**
1511  * called by generic HDLC layer to send frame
1512  *
1513  * skb  socket buffer containing HDLC frame
1514  * dev  pointer to network device structure
1515  *
1516  * returns 0 if success, otherwise error code
1517  */
1518 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1519 {
1520         struct slgt_info *info = dev_to_port(dev);
1521         struct net_device_stats *stats = hdlc_stats(dev);
1522         unsigned long flags;
1523
1524         DBGINFO(("%s hdlc_xmit\n", dev->name));
1525
1526         /* stop sending until this frame completes */
1527         netif_stop_queue(dev);
1528
1529         /* copy data to device buffers */
1530         info->tx_count = skb->len;
1531         tx_load(info, skb->data, skb->len);
1532
1533         /* update network statistics */
1534         stats->tx_packets++;
1535         stats->tx_bytes += skb->len;
1536
1537         /* done with socket buffer, so free it */
1538         dev_kfree_skb(skb);
1539
1540         /* save start time for transmit timeout detection */
1541         dev->trans_start = jiffies;
1542
1543         /* start hardware transmitter if necessary */
1544         spin_lock_irqsave(&info->lock,flags);
1545         if (!info->tx_active)
1546                 tx_start(info);
1547         spin_unlock_irqrestore(&info->lock,flags);
1548
1549         return 0;
1550 }
1551
1552 /**
1553  * called by network layer when interface enabled
1554  * claim resources and initialize hardware
1555  *
1556  * dev  pointer to network device structure
1557  *
1558  * returns 0 if success, otherwise error code
1559  */
1560 static int hdlcdev_open(struct net_device *dev)
1561 {
1562         struct slgt_info *info = dev_to_port(dev);
1563         int rc;
1564         unsigned long flags;
1565
1566         if (!try_module_get(THIS_MODULE))
1567                 return -EBUSY;
1568
1569         DBGINFO(("%s hdlcdev_open\n", dev->name));
1570
1571         /* generic HDLC layer open processing */
1572         if ((rc = hdlc_open(dev)))
1573                 return rc;
1574
1575         /* arbitrate between network and tty opens */
1576         spin_lock_irqsave(&info->netlock, flags);
1577         if (info->count != 0 || info->netcount != 0) {
1578                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1579                 spin_unlock_irqrestore(&info->netlock, flags);
1580                 return -EBUSY;
1581         }
1582         info->netcount=1;
1583         spin_unlock_irqrestore(&info->netlock, flags);
1584
1585         /* claim resources and init adapter */
1586         if ((rc = startup(info)) != 0) {
1587                 spin_lock_irqsave(&info->netlock, flags);
1588                 info->netcount=0;
1589                 spin_unlock_irqrestore(&info->netlock, flags);
1590                 return rc;
1591         }
1592
1593         /* assert DTR and RTS, apply hardware settings */
1594         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1595         program_hw(info);
1596
1597         /* enable network layer transmit */
1598         dev->trans_start = jiffies;
1599         netif_start_queue(dev);
1600
1601         /* inform generic HDLC layer of current DCD status */
1602         spin_lock_irqsave(&info->lock, flags);
1603         get_signals(info);
1604         spin_unlock_irqrestore(&info->lock, flags);
1605         if (info->signals & SerialSignal_DCD)
1606                 netif_carrier_on(dev);
1607         else
1608                 netif_carrier_off(dev);
1609         return 0;
1610 }
1611
1612 /**
1613  * called by network layer when interface is disabled
1614  * shutdown hardware and release resources
1615  *
1616  * dev  pointer to network device structure
1617  *
1618  * returns 0 if success, otherwise error code
1619  */
1620 static int hdlcdev_close(struct net_device *dev)
1621 {
1622         struct slgt_info *info = dev_to_port(dev);
1623         unsigned long flags;
1624
1625         DBGINFO(("%s hdlcdev_close\n", dev->name));
1626
1627         netif_stop_queue(dev);
1628
1629         /* shutdown adapter and release resources */
1630         shutdown(info);
1631
1632         hdlc_close(dev);
1633
1634         spin_lock_irqsave(&info->netlock, flags);
1635         info->netcount=0;
1636         spin_unlock_irqrestore(&info->netlock, flags);
1637
1638         module_put(THIS_MODULE);
1639         return 0;
1640 }
1641
1642 /**
1643  * called by network layer to process IOCTL call to network device
1644  *
1645  * dev  pointer to network device structure
1646  * ifr  pointer to network interface request structure
1647  * cmd  IOCTL command code
1648  *
1649  * returns 0 if success, otherwise error code
1650  */
1651 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1652 {
1653         const size_t size = sizeof(sync_serial_settings);
1654         sync_serial_settings new_line;
1655         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1656         struct slgt_info *info = dev_to_port(dev);
1657         unsigned int flags;
1658
1659         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1660
1661         /* return error if TTY interface open */
1662         if (info->count)
1663                 return -EBUSY;
1664
1665         if (cmd != SIOCWANDEV)
1666                 return hdlc_ioctl(dev, ifr, cmd);
1667
1668         switch(ifr->ifr_settings.type) {
1669         case IF_GET_IFACE: /* return current sync_serial_settings */
1670
1671                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1672                 if (ifr->ifr_settings.size < size) {
1673                         ifr->ifr_settings.size = size; /* data size wanted */
1674                         return -ENOBUFS;
1675                 }
1676
1677                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1678                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1679                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1680                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1681
1682                 switch (flags){
1683                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1684                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1685                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1686                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1687                 default: new_line.clock_type = CLOCK_DEFAULT;
1688                 }
1689
1690                 new_line.clock_rate = info->params.clock_speed;
1691                 new_line.loopback   = info->params.loopback ? 1:0;
1692
1693                 if (copy_to_user(line, &new_line, size))
1694                         return -EFAULT;
1695                 return 0;
1696
1697         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1698
1699                 if(!capable(CAP_NET_ADMIN))
1700                         return -EPERM;
1701                 if (copy_from_user(&new_line, line, size))
1702                         return -EFAULT;
1703
1704                 switch (new_line.clock_type)
1705                 {
1706                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1707                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1708                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1709                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1710                 case CLOCK_DEFAULT:  flags = info->params.flags &
1711                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1712                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1713                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1714                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1715                 default: return -EINVAL;
1716                 }
1717
1718                 if (new_line.loopback != 0 && new_line.loopback != 1)
1719                         return -EINVAL;
1720
1721                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1722                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1723                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1724                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1725                 info->params.flags |= flags;
1726
1727                 info->params.loopback = new_line.loopback;
1728
1729                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1730                         info->params.clock_speed = new_line.clock_rate;
1731                 else
1732                         info->params.clock_speed = 0;
1733
1734                 /* if network interface up, reprogram hardware */
1735                 if (info->netcount)
1736                         program_hw(info);
1737                 return 0;
1738
1739         default:
1740                 return hdlc_ioctl(dev, ifr, cmd);
1741         }
1742 }
1743
1744 /**
1745  * called by network layer when transmit timeout is detected
1746  *
1747  * dev  pointer to network device structure
1748  */
1749 static void hdlcdev_tx_timeout(struct net_device *dev)
1750 {
1751         struct slgt_info *info = dev_to_port(dev);
1752         struct net_device_stats *stats = hdlc_stats(dev);
1753         unsigned long flags;
1754
1755         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1756
1757         stats->tx_errors++;
1758         stats->tx_aborted_errors++;
1759
1760         spin_lock_irqsave(&info->lock,flags);
1761         tx_stop(info);
1762         spin_unlock_irqrestore(&info->lock,flags);
1763
1764         netif_wake_queue(dev);
1765 }
1766
1767 /**
1768  * called by device driver when transmit completes
1769  * reenable network layer transmit if stopped
1770  *
1771  * info  pointer to device instance information
1772  */
1773 static void hdlcdev_tx_done(struct slgt_info *info)
1774 {
1775         if (netif_queue_stopped(info->netdev))
1776                 netif_wake_queue(info->netdev);
1777 }
1778
1779 /**
1780  * called by device driver when frame received
1781  * pass frame to network layer
1782  *
1783  * info  pointer to device instance information
1784  * buf   pointer to buffer contianing frame data
1785  * size  count of data bytes in buf
1786  */
1787 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1788 {
1789         struct sk_buff *skb = dev_alloc_skb(size);
1790         struct net_device *dev = info->netdev;
1791         struct net_device_stats *stats = hdlc_stats(dev);
1792
1793         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1794
1795         if (skb == NULL) {
1796                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1797                 stats->rx_dropped++;
1798                 return;
1799         }
1800
1801         memcpy(skb_put(skb, size),buf,size);
1802
1803         skb->protocol = hdlc_type_trans(skb, info->netdev);
1804
1805         stats->rx_packets++;
1806         stats->rx_bytes += size;
1807
1808         netif_rx(skb);
1809
1810         info->netdev->last_rx = jiffies;
1811 }
1812
1813 /**
1814  * called by device driver when adding device instance
1815  * do generic HDLC initialization
1816  *
1817  * info  pointer to device instance information
1818  *
1819  * returns 0 if success, otherwise error code
1820  */
1821 static int hdlcdev_init(struct slgt_info *info)
1822 {
1823         int rc;
1824         struct net_device *dev;
1825         hdlc_device *hdlc;
1826
1827         /* allocate and initialize network and HDLC layer objects */
1828
1829         if (!(dev = alloc_hdlcdev(info))) {
1830                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1831                 return -ENOMEM;
1832         }
1833
1834         /* for network layer reporting purposes only */
1835         dev->mem_start = info->phys_reg_addr;
1836         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1837         dev->irq       = info->irq_level;
1838
1839         /* network layer callbacks and settings */
1840         dev->do_ioctl       = hdlcdev_ioctl;
1841         dev->open           = hdlcdev_open;
1842         dev->stop           = hdlcdev_close;
1843         dev->tx_timeout     = hdlcdev_tx_timeout;
1844         dev->watchdog_timeo = 10*HZ;
1845         dev->tx_queue_len   = 50;
1846
1847         /* generic HDLC layer callbacks and settings */
1848         hdlc         = dev_to_hdlc(dev);
1849         hdlc->attach = hdlcdev_attach;
1850         hdlc->xmit   = hdlcdev_xmit;
1851
1852         /* register objects with HDLC layer */
1853         if ((rc = register_hdlc_device(dev))) {
1854                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1855                 free_netdev(dev);
1856                 return rc;
1857         }
1858
1859         info->netdev = dev;
1860         return 0;
1861 }
1862
1863 /**
1864  * called by device driver when removing device instance
1865  * do generic HDLC cleanup
1866  *
1867  * info  pointer to device instance information
1868  */
1869 static void hdlcdev_exit(struct slgt_info *info)
1870 {
1871         unregister_hdlc_device(info->netdev);
1872         free_netdev(info->netdev);
1873         info->netdev = NULL;
1874 }
1875
1876 #endif /* ifdef CONFIG_HDLC */
1877
1878 /*
1879  * get async data from rx DMA buffers
1880  */
1881 static void rx_async(struct slgt_info *info)
1882 {
1883         struct tty_struct *tty = info->tty;
1884         struct mgsl_icount *icount = &info->icount;
1885         unsigned int start, end;
1886         unsigned char *p;
1887         unsigned char status;
1888         struct slgt_desc *bufs = info->rbufs;
1889         int i, count;
1890         int chars = 0;
1891         int stat;
1892         unsigned char ch;
1893
1894         start = end = info->rbuf_current;
1895
1896         while(desc_complete(bufs[end])) {
1897                 count = desc_count(bufs[end]) - info->rbuf_index;
1898                 p     = bufs[end].buf + info->rbuf_index;
1899
1900                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1901                 DBGDATA(info, p, count, "rx");
1902
1903                 for(i=0 ; i < count; i+=2, p+=2) {
1904                         ch = *p;
1905                         icount->rx++;
1906
1907                         stat = 0;
1908
1909                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1910                                 if (status & BIT1)
1911                                         icount->parity++;
1912                                 else if (status & BIT0)
1913                                         icount->frame++;
1914                                 /* discard char if tty control flags say so */
1915                                 if (status & info->ignore_status_mask)
1916                                         continue;
1917                                 if (status & BIT1)
1918                                         stat = TTY_PARITY;
1919                                 else if (status & BIT0)
1920                                         stat = TTY_FRAME;
1921                         }
1922                         if (tty) {
1923                                 tty_insert_flip_char(tty, ch, stat);
1924                                 chars++;
1925                         }
1926                 }
1927
1928                 if (i < count) {
1929                         /* receive buffer not completed */
1930                         info->rbuf_index += i;
1931                         mod_timer(&info->rx_timer, jiffies + 1);
1932                         break;
1933                 }
1934
1935                 info->rbuf_index = 0;
1936                 free_rbufs(info, end, end);
1937
1938                 if (++end == info->rbuf_count)
1939                         end = 0;
1940
1941                 /* if entire list searched then no frame available */
1942                 if (end == start)
1943                         break;
1944         }
1945
1946         if (tty && chars)
1947                 tty_flip_buffer_push(tty);
1948 }
1949
1950 /*
1951  * return next bottom half action to perform
1952  */
1953 static int bh_action(struct slgt_info *info)
1954 {
1955         unsigned long flags;
1956         int rc;
1957
1958         spin_lock_irqsave(&info->lock,flags);
1959
1960         if (info->pending_bh & BH_RECEIVE) {
1961                 info->pending_bh &= ~BH_RECEIVE;
1962                 rc = BH_RECEIVE;
1963         } else if (info->pending_bh & BH_TRANSMIT) {
1964                 info->pending_bh &= ~BH_TRANSMIT;
1965                 rc = BH_TRANSMIT;
1966         } else if (info->pending_bh & BH_STATUS) {
1967                 info->pending_bh &= ~BH_STATUS;
1968                 rc = BH_STATUS;
1969         } else {
1970                 /* Mark BH routine as complete */
1971                 info->bh_running   = 0;
1972                 info->bh_requested = 0;
1973                 rc = 0;
1974         }
1975
1976         spin_unlock_irqrestore(&info->lock,flags);
1977
1978         return rc;
1979 }
1980
1981 /*
1982  * perform bottom half processing
1983  */
1984 static void bh_handler(struct work_struct *work)
1985 {
1986         struct slgt_info *info = container_of(work, struct slgt_info, task);
1987         int action;
1988
1989         if (!info)
1990                 return;
1991         info->bh_running = 1;
1992
1993         while((action = bh_action(info))) {
1994                 switch (action) {
1995                 case BH_RECEIVE:
1996                         DBGBH(("%s bh receive\n", info->device_name));
1997                         switch(info->params.mode) {
1998                         case MGSL_MODE_ASYNC:
1999                                 rx_async(info);
2000                                 break;
2001                         case MGSL_MODE_HDLC:
2002                                 while(rx_get_frame(info));
2003                                 break;
2004                         case MGSL_MODE_RAW:
2005                         case MGSL_MODE_MONOSYNC:
2006                         case MGSL_MODE_BISYNC:
2007                                 while(rx_get_buf(info));
2008                                 break;
2009                         }
2010                         /* restart receiver if rx DMA buffers exhausted */
2011                         if (info->rx_restart)
2012                                 rx_start(info);
2013                         break;
2014                 case BH_TRANSMIT:
2015                         bh_transmit(info);
2016                         break;
2017                 case BH_STATUS:
2018                         DBGBH(("%s bh status\n", info->device_name));
2019                         info->ri_chkcount = 0;
2020                         info->dsr_chkcount = 0;
2021                         info->dcd_chkcount = 0;
2022                         info->cts_chkcount = 0;
2023                         break;
2024                 default:
2025                         DBGBH(("%s unknown action\n", info->device_name));
2026                         break;
2027                 }
2028         }
2029         DBGBH(("%s bh_handler exit\n", info->device_name));
2030 }
2031
2032 static void bh_transmit(struct slgt_info *info)
2033 {
2034         struct tty_struct *tty = info->tty;
2035
2036         DBGBH(("%s bh_transmit\n", info->device_name));
2037         if (tty)
2038                 tty_wakeup(tty);
2039 }
2040
2041 static void dsr_change(struct slgt_info *info, unsigned short status)
2042 {
2043         if (status & BIT3) {
2044                 info->signals |= SerialSignal_DSR;
2045                 info->input_signal_events.dsr_up++;
2046         } else {
2047                 info->signals &= ~SerialSignal_DSR;
2048                 info->input_signal_events.dsr_down++;
2049         }
2050         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2051         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2052                 slgt_irq_off(info, IRQ_DSR);
2053                 return;
2054         }
2055         info->icount.dsr++;
2056         wake_up_interruptible(&info->status_event_wait_q);
2057         wake_up_interruptible(&info->event_wait_q);
2058         info->pending_bh |= BH_STATUS;
2059 }
2060
2061 static void cts_change(struct slgt_info *info, unsigned short status)
2062 {
2063         if (status & BIT2) {
2064                 info->signals |= SerialSignal_CTS;
2065                 info->input_signal_events.cts_up++;
2066         } else {
2067                 info->signals &= ~SerialSignal_CTS;
2068                 info->input_signal_events.cts_down++;
2069         }
2070         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2071         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2072                 slgt_irq_off(info, IRQ_CTS);
2073                 return;
2074         }
2075         info->icount.cts++;
2076         wake_up_interruptible(&info->status_event_wait_q);
2077         wake_up_interruptible(&info->event_wait_q);
2078         info->pending_bh |= BH_STATUS;
2079
2080         if (info->flags & ASYNC_CTS_FLOW) {
2081                 if (info->tty) {
2082                         if (info->tty->hw_stopped) {
2083                                 if (info->signals & SerialSignal_CTS) {
2084                                         info->tty->hw_stopped = 0;
2085                                         info->pending_bh |= BH_TRANSMIT;
2086                                         return;
2087                                 }
2088                         } else {
2089                                 if (!(info->signals & SerialSignal_CTS))
2090                                         info->tty->hw_stopped = 1;
2091                         }
2092                 }
2093         }
2094 }
2095
2096 static void dcd_change(struct slgt_info *info, unsigned short status)
2097 {
2098         if (status & BIT1) {
2099                 info->signals |= SerialSignal_DCD;
2100                 info->input_signal_events.dcd_up++;
2101         } else {
2102                 info->signals &= ~SerialSignal_DCD;
2103                 info->input_signal_events.dcd_down++;
2104         }
2105         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2106         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2107                 slgt_irq_off(info, IRQ_DCD);
2108                 return;
2109         }
2110         info->icount.dcd++;
2111 #if SYNCLINK_GENERIC_HDLC
2112         if (info->netcount) {
2113                 if (info->signals & SerialSignal_DCD)
2114                         netif_carrier_on(info->netdev);
2115                 else
2116                         netif_carrier_off(info->netdev);
2117         }
2118 #endif
2119         wake_up_interruptible(&info->status_event_wait_q);
2120         wake_up_interruptible(&info->event_wait_q);
2121         info->pending_bh |= BH_STATUS;
2122
2123         if (info->flags & ASYNC_CHECK_CD) {
2124                 if (info->signals & SerialSignal_DCD)
2125                         wake_up_interruptible(&info->open_wait);
2126                 else {
2127                         if (info->tty)
2128                                 tty_hangup(info->tty);
2129                 }
2130         }
2131 }
2132
2133 static void ri_change(struct slgt_info *info, unsigned short status)
2134 {
2135         if (status & BIT0) {
2136                 info->signals |= SerialSignal_RI;
2137                 info->input_signal_events.ri_up++;
2138         } else {
2139                 info->signals &= ~SerialSignal_RI;
2140                 info->input_signal_events.ri_down++;
2141         }
2142         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2143         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2144                 slgt_irq_off(info, IRQ_RI);
2145                 return;
2146         }
2147         info->icount.rng++;
2148         wake_up_interruptible(&info->status_event_wait_q);
2149         wake_up_interruptible(&info->event_wait_q);
2150         info->pending_bh |= BH_STATUS;
2151 }
2152
2153 static void isr_serial(struct slgt_info *info)
2154 {
2155         unsigned short status = rd_reg16(info, SSR);
2156
2157         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2158
2159         wr_reg16(info, SSR, status); /* clear pending */
2160
2161         info->irq_occurred = 1;
2162
2163         if (info->params.mode == MGSL_MODE_ASYNC) {
2164                 if (status & IRQ_TXIDLE) {
2165                         if (info->tx_count)
2166                                 isr_txeom(info, status);
2167                 }
2168                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2169                         info->icount.brk++;
2170                         /* process break detection if tty control allows */
2171                         if (info->tty) {
2172                                 if (!(status & info->ignore_status_mask)) {
2173                                         if (info->read_status_mask & MASK_BREAK) {
2174                                                 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
2175                                                 if (info->flags & ASYNC_SAK)
2176                                                         do_SAK(info->tty);
2177                                         }
2178                                 }
2179                         }
2180                 }
2181         } else {
2182                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2183                         isr_txeom(info, status);
2184
2185                 if (status & IRQ_RXIDLE) {
2186                         if (status & RXIDLE)
2187                                 info->icount.rxidle++;
2188                         else
2189                                 info->icount.exithunt++;
2190                         wake_up_interruptible(&info->event_wait_q);
2191                 }
2192
2193                 if (status & IRQ_RXOVER)
2194                         rx_start(info);
2195         }
2196
2197         if (status & IRQ_DSR)
2198                 dsr_change(info, status);
2199         if (status & IRQ_CTS)
2200                 cts_change(info, status);
2201         if (status & IRQ_DCD)
2202                 dcd_change(info, status);
2203         if (status & IRQ_RI)
2204                 ri_change(info, status);
2205 }
2206
2207 static void isr_rdma(struct slgt_info *info)
2208 {
2209         unsigned int status = rd_reg32(info, RDCSR);
2210
2211         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2212
2213         /* RDCSR (rx DMA control/status)
2214          *
2215          * 31..07  reserved
2216          * 06      save status byte to DMA buffer
2217          * 05      error
2218          * 04      eol (end of list)
2219          * 03      eob (end of buffer)
2220          * 02      IRQ enable
2221          * 01      reset
2222          * 00      enable
2223          */
2224         wr_reg32(info, RDCSR, status);  /* clear pending */
2225
2226         if (status & (BIT5 + BIT4)) {
2227                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2228                 info->rx_restart = 1;
2229         }
2230         info->pending_bh |= BH_RECEIVE;
2231 }
2232
2233 static void isr_tdma(struct slgt_info *info)
2234 {
2235         unsigned int status = rd_reg32(info, TDCSR);
2236
2237         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2238
2239         /* TDCSR (tx DMA control/status)
2240          *
2241          * 31..06  reserved
2242          * 05      error
2243          * 04      eol (end of list)
2244          * 03      eob (end of buffer)
2245          * 02      IRQ enable
2246          * 01      reset
2247          * 00      enable
2248          */
2249         wr_reg32(info, TDCSR, status);  /* clear pending */
2250
2251         if (status & (BIT5 + BIT4 + BIT3)) {
2252                 // another transmit buffer has completed
2253                 // run bottom half to get more send data from user
2254                 info->pending_bh |= BH_TRANSMIT;
2255         }
2256 }
2257
2258 static void isr_txeom(struct slgt_info *info, unsigned short status)
2259 {
2260         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2261
2262         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2263         tdma_reset(info);
2264         reset_tbufs(info);
2265         if (status & IRQ_TXUNDER) {
2266                 unsigned short val = rd_reg16(info, TCR);
2267                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2268                 wr_reg16(info, TCR, val); /* clear reset bit */
2269         }
2270
2271         if (info->tx_active) {
2272                 if (info->params.mode != MGSL_MODE_ASYNC) {
2273                         if (status & IRQ_TXUNDER)
2274                                 info->icount.txunder++;
2275                         else if (status & IRQ_TXIDLE)
2276                                 info->icount.txok++;
2277                 }
2278
2279                 info->tx_active = 0;
2280                 info->tx_count = 0;
2281
2282                 del_timer(&info->tx_timer);
2283
2284                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2285                         info->signals &= ~SerialSignal_RTS;
2286                         info->drop_rts_on_tx_done = 0;
2287                         set_signals(info);
2288                 }
2289
2290 #if SYNCLINK_GENERIC_HDLC
2291                 if (info->netcount)
2292                         hdlcdev_tx_done(info);
2293                 else
2294 #endif
2295                 {
2296                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2297                                 tx_stop(info);
2298                                 return;
2299                         }
2300                         info->pending_bh |= BH_TRANSMIT;
2301                 }
2302         }
2303 }
2304
2305 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2306 {
2307         struct cond_wait *w, *prev;
2308
2309         /* wake processes waiting for specific transitions */
2310         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2311                 if (w->data & changed) {
2312                         w->data = state;
2313                         wake_up_interruptible(&w->q);
2314                         if (prev != NULL)
2315                                 prev->next = w->next;
2316                         else
2317                                 info->gpio_wait_q = w->next;
2318                 } else
2319                         prev = w;
2320         }
2321 }
2322
2323 /* interrupt service routine
2324  *
2325  *      irq     interrupt number
2326  *      dev_id  device ID supplied during interrupt registration
2327  */
2328 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2329 {
2330         struct slgt_info *info = dev_id;
2331         unsigned int gsr;
2332         unsigned int i;
2333
2334         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2335
2336         spin_lock(&info->lock);
2337
2338         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2339                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2340                 info->irq_occurred = 1;
2341                 for(i=0; i < info->port_count ; i++) {
2342                         if (info->port_array[i] == NULL)
2343                                 continue;
2344                         if (gsr & (BIT8 << i))
2345                                 isr_serial(info->port_array[i]);
2346                         if (gsr & (BIT16 << (i*2)))
2347                                 isr_rdma(info->port_array[i]);
2348                         if (gsr & (BIT17 << (i*2)))
2349                                 isr_tdma(info->port_array[i]);
2350                 }
2351         }
2352
2353         if (info->gpio_present) {
2354                 unsigned int state;
2355                 unsigned int changed;
2356                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2357                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2358                         /* read latched state of GPIO signals */
2359                         state = rd_reg32(info, IOVR);
2360                         /* clear pending GPIO interrupt bits */
2361                         wr_reg32(info, IOSR, changed);
2362                         for (i=0 ; i < info->port_count ; i++) {
2363                                 if (info->port_array[i] != NULL)
2364                                         isr_gpio(info->port_array[i], changed, state);
2365                         }
2366                 }
2367         }
2368
2369         for(i=0; i < info->port_count ; i++) {
2370                 struct slgt_info *port = info->port_array[i];
2371
2372                 if (port && (port->count || port->netcount) &&
2373                     port->pending_bh && !port->bh_running &&
2374                     !port->bh_requested) {
2375                         DBGISR(("%s bh queued\n", port->device_name));
2376                         schedule_work(&port->task);
2377                         port->bh_requested = 1;
2378                 }
2379         }
2380
2381         spin_unlock(&info->lock);
2382
2383         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2384         return IRQ_HANDLED;
2385 }
2386
2387 static int startup(struct slgt_info *info)
2388 {
2389         DBGINFO(("%s startup\n", info->device_name));
2390
2391         if (info->flags & ASYNC_INITIALIZED)
2392                 return 0;
2393
2394         if (!info->tx_buf) {
2395                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2396                 if (!info->tx_buf) {
2397                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2398                         return -ENOMEM;
2399                 }
2400         }
2401
2402         info->pending_bh = 0;
2403
2404         memset(&info->icount, 0, sizeof(info->icount));
2405
2406         /* program hardware for current parameters */
2407         change_params(info);
2408
2409         if (info->tty)
2410                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2411
2412         info->flags |= ASYNC_INITIALIZED;
2413
2414         return 0;
2415 }
2416
2417 /*
2418  *  called by close() and hangup() to shutdown hardware
2419  */
2420 static void shutdown(struct slgt_info *info)
2421 {
2422         unsigned long flags;
2423
2424         if (!(info->flags & ASYNC_INITIALIZED))
2425                 return;
2426
2427         DBGINFO(("%s shutdown\n", info->device_name));
2428
2429         /* clear status wait queue because status changes */
2430         /* can't happen after shutting down the hardware */
2431         wake_up_interruptible(&info->status_event_wait_q);
2432         wake_up_interruptible(&info->event_wait_q);
2433
2434         del_timer_sync(&info->tx_timer);
2435         del_timer_sync(&info->rx_timer);
2436
2437         kfree(info->tx_buf);
2438         info->tx_buf = NULL;
2439
2440         spin_lock_irqsave(&info->lock,flags);
2441
2442         tx_stop(info);
2443         rx_stop(info);
2444
2445         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2446
2447         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2448                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2449                 set_signals(info);
2450         }
2451
2452         flush_cond_wait(&info->gpio_wait_q);
2453
2454         spin_unlock_irqrestore(&info->lock,flags);
2455
2456         if (info->tty)
2457                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2458
2459         info->flags &= ~ASYNC_INITIALIZED;
2460 }
2461
2462 static void program_hw(struct slgt_info *info)
2463 {
2464         unsigned long flags;
2465
2466         spin_lock_irqsave(&info->lock,flags);
2467
2468         rx_stop(info);
2469         tx_stop(info);
2470
2471         if (info->params.mode != MGSL_MODE_ASYNC ||
2472             info->netcount)
2473                 sync_mode(info);
2474         else
2475                 async_mode(info);
2476
2477         set_signals(info);
2478
2479         info->dcd_chkcount = 0;
2480         info->cts_chkcount = 0;
2481         info->ri_chkcount = 0;
2482         info->dsr_chkcount = 0;
2483
2484         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2485         get_signals(info);
2486
2487         if (info->netcount ||
2488             (info->tty && info->tty->termios->c_cflag & CREAD))
2489                 rx_start(info);
2490
2491         spin_unlock_irqrestore(&info->lock,flags);
2492 }
2493
2494 /*
2495  * reconfigure adapter based on new parameters
2496  */
2497 static void change_params(struct slgt_info *info)
2498 {
2499         unsigned cflag;
2500         int bits_per_char;
2501
2502         if (!info->tty || !info->tty->termios)
2503                 return;
2504         DBGINFO(("%s change_params\n", info->device_name));
2505
2506         cflag = info->tty->termios->c_cflag;
2507
2508         /* if B0 rate (hangup) specified then negate DTR and RTS */
2509         /* otherwise assert DTR and RTS */
2510         if (cflag & CBAUD)
2511                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2512         else
2513                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2514
2515         /* byte size and parity */
2516
2517         switch (cflag & CSIZE) {
2518         case CS5: info->params.data_bits = 5; break;
2519         case CS6: info->params.data_bits = 6; break;
2520         case CS7: info->params.data_bits = 7; break;
2521         case CS8: info->params.data_bits = 8; break;
2522         default:  info->params.data_bits = 7; break;
2523         }
2524
2525         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2526
2527         if (cflag & PARENB)
2528                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2529         else
2530                 info->params.parity = ASYNC_PARITY_NONE;
2531
2532         /* calculate number of jiffies to transmit a full
2533          * FIFO (32 bytes) at specified data rate
2534          */
2535         bits_per_char = info->params.data_bits +
2536                         info->params.stop_bits + 1;
2537
2538         info->params.data_rate = tty_get_baud_rate(info->tty);
2539
2540         if (info->params.data_rate) {
2541                 info->timeout = (32*HZ*bits_per_char) /
2542                                 info->params.data_rate;
2543         }
2544         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2545
2546         if (cflag & CRTSCTS)
2547                 info->flags |= ASYNC_CTS_FLOW;
2548         else
2549                 info->flags &= ~ASYNC_CTS_FLOW;
2550
2551         if (cflag & CLOCAL)
2552                 info->flags &= ~ASYNC_CHECK_CD;
2553         else
2554                 info->flags |= ASYNC_CHECK_CD;
2555
2556         /* process tty input control flags */
2557
2558         info->read_status_mask = IRQ_RXOVER;
2559         if (I_INPCK(info->tty))
2560                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2561         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2562                 info->read_status_mask |= MASK_BREAK;
2563         if (I_IGNPAR(info->tty))
2564                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2565         if (I_IGNBRK(info->tty)) {
2566                 info->ignore_status_mask |= MASK_BREAK;
2567                 /* If ignoring parity and break indicators, ignore
2568                  * overruns too.  (For real raw support).
2569                  */
2570                 if (I_IGNPAR(info->tty))
2571                         info->ignore_status_mask |= MASK_OVERRUN;
2572         }
2573
2574         program_hw(info);
2575 }
2576
2577 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2578 {
2579         DBGINFO(("%s get_stats\n",  info->device_name));
2580         if (!user_icount) {
2581                 memset(&info->icount, 0, sizeof(info->icount));
2582         } else {
2583                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2584                         return -EFAULT;
2585         }
2586         return 0;
2587 }
2588
2589 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2590 {
2591         DBGINFO(("%s get_params\n", info->device_name));
2592         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2593                 return -EFAULT;
2594         return 0;
2595 }
2596
2597 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2598 {
2599         unsigned long flags;
2600         MGSL_PARAMS tmp_params;
2601
2602         DBGINFO(("%s set_params\n", info->device_name));
2603         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2604                 return -EFAULT;
2605
2606         spin_lock_irqsave(&info->lock, flags);
2607         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2608         spin_unlock_irqrestore(&info->lock, flags);
2609
2610         change_params(info);
2611
2612         return 0;
2613 }
2614
2615 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2616 {
2617         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2618         if (put_user(info->idle_mode, idle_mode))
2619                 return -EFAULT;
2620         return 0;
2621 }
2622
2623 static int set_txidle(struct slgt_info *info, int idle_mode)
2624 {
2625         unsigned long flags;
2626         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2627         spin_lock_irqsave(&info->lock,flags);
2628         info->idle_mode = idle_mode;
2629         if (info->params.mode != MGSL_MODE_ASYNC)
2630                 tx_set_idle(info);
2631         spin_unlock_irqrestore(&info->lock,flags);
2632         return 0;
2633 }
2634
2635 static int tx_enable(struct slgt_info *info, int enable)
2636 {
2637         unsigned long flags;
2638         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2639         spin_lock_irqsave(&info->lock,flags);
2640         if (enable) {
2641                 if (!info->tx_enabled)
2642                         tx_start(info);
2643         } else {
2644                 if (info->tx_enabled)
2645                         tx_stop(info);
2646         }
2647         spin_unlock_irqrestore(&info->lock,flags);
2648         return 0;
2649 }
2650
2651 /*
2652  * abort transmit HDLC frame
2653  */
2654 static int tx_abort(struct slgt_info *info)
2655 {
2656         unsigned long flags;
2657         DBGINFO(("%s tx_abort\n", info->device_name));
2658         spin_lock_irqsave(&info->lock,flags);
2659         tdma_reset(info);
2660         spin_unlock_irqrestore(&info->lock,flags);
2661         return 0;
2662 }
2663
2664 static int rx_enable(struct slgt_info *info, int enable)
2665 {
2666         unsigned long flags;
2667         DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2668         spin_lock_irqsave(&info->lock,flags);
2669         if (enable) {
2670                 if (!info->rx_enabled)
2671                         rx_start(info);
2672                 else if (enable == 2) {
2673                         /* force hunt mode (write 1 to RCR[3]) */
2674                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2675                 }
2676         } else {
2677                 if (info->rx_enabled)
2678                         rx_stop(info);
2679         }
2680         spin_unlock_irqrestore(&info->lock,flags);
2681         return 0;
2682 }
2683
2684 /*
2685  *  wait for specified event to occur
2686  */
2687 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2688 {
2689         unsigned long flags;
2690         int s;
2691         int rc=0;
2692         struct mgsl_icount cprev, cnow;
2693         int events;
2694         int mask;
2695         struct  _input_signal_events oldsigs, newsigs;
2696         DECLARE_WAITQUEUE(wait, current);
2697
2698         if (get_user(mask, mask_ptr))
2699                 return -EFAULT;
2700
2701         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2702
2703         spin_lock_irqsave(&info->lock,flags);
2704
2705         /* return immediately if state matches requested events */
2706         get_signals(info);
2707         s = info->signals;
2708
2709         events = mask &
2710                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2711                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2712                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2713                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2714         if (events) {
2715                 spin_unlock_irqrestore(&info->lock,flags);
2716                 goto exit;
2717         }
2718
2719         /* save current irq counts */
2720         cprev = info->icount;
2721         oldsigs = info->input_signal_events;
2722
2723         /* enable hunt and idle irqs if needed */
2724         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2725                 unsigned short val = rd_reg16(info, SCR);
2726                 if (!(val & IRQ_RXIDLE))
2727                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2728         }
2729
2730         set_current_state(TASK_INTERRUPTIBLE);
2731         add_wait_queue(&info->event_wait_q, &wait);
2732
2733         spin_unlock_irqrestore(&info->lock,flags);
2734
2735         for(;;) {
2736                 schedule();
2737                 if (signal_pending(current)) {
2738                         rc = -ERESTARTSYS;
2739                         break;
2740                 }
2741
2742                 /* get current irq counts */
2743                 spin_lock_irqsave(&info->lock,flags);
2744                 cnow = info->icount;
2745                 newsigs = info->input_signal_events;
2746                 set_current_state(TASK_INTERRUPTIBLE);
2747                 spin_unlock_irqrestore(&info->lock,flags);
2748
2749                 /* if no change, wait aborted for some reason */
2750                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2751                     newsigs.dsr_down == oldsigs.dsr_down &&
2752                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2753                     newsigs.dcd_down == oldsigs.dcd_down &&
2754                     newsigs.cts_up   == oldsigs.cts_up   &&
2755                     newsigs.cts_down == oldsigs.cts_down &&
2756                     newsigs.ri_up    == oldsigs.ri_up    &&
2757                     newsigs.ri_down  == oldsigs.ri_down  &&
2758                     cnow.exithunt    == cprev.exithunt   &&
2759                     cnow.rxidle      == cprev.rxidle) {
2760                         rc = -EIO;
2761                         break;
2762                 }
2763
2764                 events = mask &
2765                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2766                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2767                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2768                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2769                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2770                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2771                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2772                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2773                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2774                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2775                 if (events)
2776                         break;
2777
2778                 cprev = cnow;
2779                 oldsigs = newsigs;
2780         }
2781
2782         remove_wait_queue(&info->event_wait_q, &wait);
2783         set_current_state(TASK_RUNNING);
2784
2785
2786         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2787                 spin_lock_irqsave(&info->lock,flags);
2788                 if (!waitqueue_active(&info->event_wait_q)) {
2789                         /* disable enable exit hunt mode/idle rcvd IRQs */
2790                         wr_reg16(info, SCR,
2791                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2792                 }
2793                 spin_unlock_irqrestore(&info->lock,flags);
2794         }
2795 exit:
2796         if (rc == 0)
2797                 rc = put_user(events, mask_ptr);
2798         return rc;
2799 }
2800
2801 static int get_interface(struct slgt_info *info, int __user *if_mode)
2802 {
2803         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2804         if (put_user(info->if_mode, if_mode))
2805                 return -EFAULT;
2806         return 0;
2807 }
2808
2809 static int set_interface(struct slgt_info *info, int if_mode)
2810 {
2811         unsigned long flags;
2812         unsigned short val;
2813
2814         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2815         spin_lock_irqsave(&info->lock,flags);
2816         info->if_mode = if_mode;
2817
2818         msc_set_vcr(info);
2819
2820         /* TCR (tx control) 07  1=RTS driver control */
2821         val = rd_reg16(info, TCR);
2822         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2823                 val |= BIT7;
2824         else
2825                 val &= ~BIT7;
2826         wr_reg16(info, TCR, val);
2827
2828         spin_unlock_irqrestore(&info->lock,flags);
2829         return 0;
2830 }
2831
2832 /*
2833  * set general purpose IO pin state and direction
2834  *
2835  * user_gpio fields:
2836  * state   each bit indicates a pin state
2837  * smask   set bit indicates pin state to set
2838  * dir     each bit indicates a pin direction (0=input, 1=output)
2839  * dmask   set bit indicates pin direction to set
2840  */
2841 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2842 {
2843         unsigned long flags;
2844         struct gpio_desc gpio;
2845         __u32 data;
2846
2847         if (!info->gpio_present)
2848                 return -EINVAL;
2849         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2850                 return -EFAULT;
2851         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2852                  info->device_name, gpio.state, gpio.smask,
2853                  gpio.dir, gpio.dmask));
2854
2855         spin_lock_irqsave(&info->lock,flags);
2856         if (gpio.dmask) {
2857                 data = rd_reg32(info, IODR);
2858                 data |= gpio.dmask & gpio.dir;
2859                 data &= ~(gpio.dmask & ~gpio.dir);
2860                 wr_reg32(info, IODR, data);
2861         }
2862         if (gpio.smask) {
2863                 data = rd_reg32(info, IOVR);
2864                 data |= gpio.smask & gpio.state;
2865                 data &= ~(gpio.smask & ~gpio.state);
2866                 wr_reg32(info, IOVR, data);
2867         }
2868         spin_unlock_irqrestore(&info->lock,flags);
2869
2870         return 0;
2871 }
2872
2873 /*
2874  * get general purpose IO pin state and direction
2875  */
2876 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2877 {
2878         struct gpio_desc gpio;
2879         if (!info->gpio_present)
2880                 return -EINVAL;
2881         gpio.state = rd_reg32(info, IOVR);
2882         gpio.smask = 0xffffffff;
2883         gpio.dir   = rd_reg32(info, IODR);
2884         gpio.dmask = 0xffffffff;
2885         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2886                 return -EFAULT;
2887         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2888                  info->device_name, gpio.state, gpio.dir));
2889         return 0;
2890 }
2891
2892 /*
2893  * conditional wait facility
2894  */
2895 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2896 {
2897         init_waitqueue_head(&w->q);
2898         init_waitqueue_entry(&w->wait, current);
2899         w->data = data;
2900 }
2901
2902 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2903 {
2904         set_current_state(TASK_INTERRUPTIBLE);
2905         add_wait_queue(&w->q, &w->wait);
2906         w->next = *head;
2907         *head = w;
2908 }
2909
2910 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2911 {
2912         struct cond_wait *w, *prev;
2913         remove_wait_queue(&cw->q, &cw->wait);
2914         set_current_state(TASK_RUNNING);
2915         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2916                 if (w == cw) {
2917                         if (prev != NULL)
2918                                 prev->next = w->next;
2919                         else
2920                                 *head = w->next;
2921                         break;
2922                 }
2923         }
2924 }
2925
2926 static void flush_cond_wait(struct cond_wait **head)
2927 {
2928         while (*head != NULL) {
2929                 wake_up_interruptible(&(*head)->q);
2930                 *head = (*head)->next;
2931         }
2932 }
2933
2934 /*
2935  * wait for general purpose I/O pin(s) to enter specified state
2936  *
2937  * user_gpio fields:
2938  * state - bit indicates target pin state
2939  * smask - set bit indicates watched pin
2940  *
2941  * The wait ends when at least one watched pin enters the specified
2942  * state. When 0 (no error) is returned, user_gpio->state is set to the
2943  * state of all GPIO pins when the wait ends.
2944  *
2945  * Note: Each pin may be a dedicated input, dedicated output, or
2946  * configurable input/output. The number and configuration of pins
2947  * varies with the specific adapter model. Only input pins (dedicated
2948  * or configured) can be monitored with this function.
2949  */
2950 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2951 {
2952         unsigned long flags;
2953         int rc = 0;
2954         struct gpio_desc gpio;
2955         struct cond_wait wait;
2956         u32 state;
2957
2958         if (!info->gpio_present)
2959                 return -EINVAL;
2960         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2961                 return -EFAULT;
2962         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2963                  info->device_name, gpio.state, gpio.smask));
2964         /* ignore output pins identified by set IODR bit */
2965         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2966                 return -EINVAL;
2967         init_cond_wait(&wait, gpio.smask);
2968
2969         spin_lock_irqsave(&info->lock, flags);
2970         /* enable interrupts for watched pins */
2971         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2972         /* get current pin states */
2973         state = rd_reg32(info, IOVR);
2974
2975         if (gpio.smask & ~(state ^ gpio.state)) {
2976                 /* already in target state */
2977                 gpio.state = state;
2978         } else {
2979                 /* wait for target state */
2980                 add_cond_wait(&info->gpio_wait_q, &wait);
2981                 spin_unlock_irqrestore(&info->lock, flags);
2982                 schedule();
2983                 if (signal_pending(current))
2984                         rc = -ERESTARTSYS;
2985                 else
2986                         gpio.state = wait.data;
2987                 spin_lock_irqsave(&info->lock, flags);
2988                 remove_cond_wait(&info->gpio_wait_q, &wait);
2989         }
2990
2991         /* disable all GPIO interrupts if no waiting processes */
2992         if (info->gpio_wait_q == NULL)
2993                 wr_reg32(info, IOER, 0);
2994         spin_unlock_irqrestore(&info->lock,flags);
2995
2996         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2997                 rc = -EFAULT;
2998         return rc;
2999 }
3000
3001 static int modem_input_wait(struct slgt_info *info,int arg)
3002 {
3003         unsigned long flags;
3004         int rc;
3005         struct mgsl_icount cprev, cnow;
3006         DECLARE_WAITQUEUE(wait, current);
3007
3008         /* save current irq counts */
3009         spin_lock_irqsave(&info->lock,flags);
3010         cprev = info->icount;
3011         add_wait_queue(&info->status_event_wait_q, &wait);
3012         set_current_state(TASK_INTERRUPTIBLE);
3013         spin_unlock_irqrestore(&info->lock,flags);
3014
3015         for(;;) {
3016                 schedule();
3017                 if (signal_pending(current)) {
3018                         rc = -ERESTARTSYS;
3019                         break;
3020                 }
3021
3022                 /* get new irq counts */
3023                 spin_lock_irqsave(&info->lock,flags);
3024                 cnow = info->icount;
3025                 set_current_state(TASK_INTERRUPTIBLE);
3026                 spin_unlock_irqrestore(&info->lock,flags);
3027
3028                 /* if no change, wait aborted for some reason */
3029                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3030                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3031                         rc = -EIO;
3032                         break;
3033                 }
3034
3035                 /* check for change in caller specified modem input */
3036                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3037                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3038                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3039                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3040                         rc = 0;
3041                         break;
3042                 }
3043
3044                 cprev = cnow;
3045         }
3046         remove_wait_queue(&info->status_event_wait_q, &wait);
3047         set_current_state(TASK_RUNNING);
3048         return rc;
3049 }
3050
3051 /*
3052  *  return state of serial control and status signals
3053  */
3054 static int tiocmget(struct tty_struct *tty, struct file *file)
3055 {
3056         struct slgt_info *info = tty->driver_data;
3057         unsigned int result;
3058         unsigned long flags;
3059
3060         spin_lock_irqsave(&info->lock,flags);
3061         get_signals(info);
3062         spin_unlock_irqrestore(&info->lock,flags);
3063
3064         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3065                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3066                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3067                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3068                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3069                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3070
3071         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3072         return result;
3073 }
3074
3075 /*
3076  * set modem control signals (DTR/RTS)
3077  *
3078  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3079  *              TIOCMSET = set/clear signal values
3080  *      value   bit mask for command
3081  */
3082 static int tiocmset(struct tty_struct *tty, struct file *file,
3083                     unsigned int set, unsigned int clear)
3084 {
3085         struct slgt_info *info = tty->driver_data;
3086         unsigned long flags;
3087
3088         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3089
3090         if (set & TIOCM_RTS)
3091                 info->signals |= SerialSignal_RTS;
3092         if (set & TIOCM_DTR)
3093                 info->signals |= SerialSignal_DTR;
3094         if (clear & TIOCM_RTS)
3095                 info->signals &= ~SerialSignal_RTS;
3096         if (clear & TIOCM_DTR)
3097                 info->signals &= ~SerialSignal_DTR;
3098
3099         spin_lock_irqsave(&info->lock,flags);
3100         set_signals(info);
3101         spin_unlock_irqrestore(&info->lock,flags);
3102         return 0;
3103 }
3104
3105 /*
3106  *  block current process until the device is ready to open
3107  */
3108 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3109                            struct slgt_info *info)
3110 {
3111         DECLARE_WAITQUEUE(wait, current);
3112         int             retval;
3113         int             do_clocal = 0, extra_count = 0;
3114         unsigned long   flags;
3115
3116         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3117
3118         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3119                 /* nonblock mode is set or port is not enabled */
3120                 info->flags |= ASYNC_NORMAL_ACTIVE;
3121                 return 0;
3122         }
3123
3124         if (tty->termios->c_cflag & CLOCAL)
3125                 do_clocal = 1;
3126
3127         /* Wait for carrier detect and the line to become
3128          * free (i.e., not in use by the callout).  While we are in
3129          * this loop, info->count is dropped by one, so that
3130          * close() knows when to free things.  We restore it upon
3131          * exit, either normal or abnormal.
3132          */
3133
3134         retval = 0;
3135         add_wait_queue(&info->open_wait, &wait);
3136
3137         spin_lock_irqsave(&info->lock, flags);
3138         if (!tty_hung_up_p(filp)) {
3139                 extra_count = 1;
3140                 info->count--;
3141         }
3142         spin_unlock_irqrestore(&info->lock, flags);
3143         info->blocked_open++;
3144
3145         while (1) {
3146                 if ((tty->termios->c_cflag & CBAUD)) {
3147                         spin_lock_irqsave(&info->lock,flags);
3148                         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3149                         set_signals(info);
3150                         spin_unlock_irqrestore(&info->lock,flags);
3151                 }
3152
3153                 set_current_state(TASK_INTERRUPTIBLE);
3154
3155                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3156                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3157                                         -EAGAIN : -ERESTARTSYS;
3158                         break;
3159                 }
3160
3161                 spin_lock_irqsave(&info->lock,flags);
3162                 get_signals(info);
3163                 spin_unlock_irqrestore(&info->lock,flags);
3164
3165                 if (!(info->flags & ASYNC_CLOSING) &&
3166                     (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3167                         break;
3168                 }
3169
3170                 if (signal_pending(current)) {
3171                         retval = -ERESTARTSYS;
3172                         break;
3173                 }
3174
3175                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3176                 schedule();
3177         }
3178
3179         set_current_state(TASK_RUNNING);
3180         remove_wait_queue(&info->open_wait, &wait);
3181
3182         if (extra_count)
3183                 info->count++;
3184         info->blocked_open--;
3185
3186         if (!retval)
3187                 info->flags |= ASYNC_NORMAL_ACTIVE;
3188
3189         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3190         return retval;
3191 }
3192
3193 static int alloc_tmp_rbuf(struct slgt_info *info)
3194 {
3195         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3196         if (info->tmp_rbuf == NULL)
3197                 return -ENOMEM;
3198         return 0;
3199 }
3200
3201 static void free_tmp_rbuf(struct slgt_info *info)
3202 {
3203         kfree(info->tmp_rbuf);
3204         info->tmp_rbuf = NULL;
3205 }
3206
3207 /*
3208  * allocate DMA descriptor lists.
3209  */
3210 static int alloc_desc(struct slgt_info *info)
3211 {
3212         unsigned int i;
3213         unsigned int pbufs;
3214
3215         /* allocate memory to hold descriptor lists */
3216         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3217         if (info->bufs == NULL)
3218                 return -ENOMEM;
3219
3220         memset(info->bufs, 0, DESC_LIST_SIZE);
3221
3222         info->rbufs = (struct slgt_desc*)info->bufs;
3223         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3224
3225         pbufs = (unsigned int)info->bufs_dma_addr;
3226
3227         /*
3228          * Build circular lists of descriptors
3229          */
3230
3231         for (i=0; i < info->rbuf_count; i++) {
3232                 /* physical address of this descriptor */
3233                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3234
3235                 /* physical address of next descriptor */
3236                 if (i == info->rbuf_count - 1)
3237                         info->rbufs[i].next = cpu_to_le32(pbufs);
3238                 else
3239                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3240                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3241         }
3242
3243         for (i=0; i < info->tbuf_count; i++) {
3244                 /* physical address of this descriptor */
3245                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3246
3247                 /* physical address of next descriptor */
3248                 if (i == info->tbuf_count - 1)
3249                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3250                 else
3251                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3252         }
3253
3254         return 0;
3255 }
3256
3257 static void free_desc(struct slgt_info *info)
3258 {
3259         if (info->bufs != NULL) {
3260                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3261                 info->bufs  = NULL;
3262                 info->rbufs = NULL;
3263                 info->tbufs = NULL;
3264         }
3265 }
3266
3267 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3268 {
3269         int i;
3270         for (i=0; i < count; i++) {
3271                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3272                         return -ENOMEM;
3273                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3274         }
3275         return 0;
3276 }
3277
3278 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3279 {
3280         int i;
3281         for (i=0; i < count; i++) {
3282                 if (bufs[i].buf == NULL)
3283                         continue;
3284                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3285                 bufs[i].buf = NULL;
3286         }
3287 }
3288
3289 static int alloc_dma_bufs(struct slgt_info *info)
3290 {
3291         info->rbuf_count = 32;
3292         info->tbuf_count = 32;
3293
3294         if (alloc_desc(info) < 0 ||
3295             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3296             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3297             alloc_tmp_rbuf(info) < 0) {
3298                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3299                 return -ENOMEM;
3300         }
3301         reset_rbufs(info);
3302         return 0;
3303 }
3304
3305 static void free_dma_bufs(struct slgt_info *info)
3306 {
3307         if (info->bufs) {
3308                 free_bufs(info, info->rbufs, info->rbuf_count);
3309                 free_bufs(info, info->tbufs, info->tbuf_count);
3310                 free_desc(info);
3311         }
3312         free_tmp_rbuf(info);
3313 }
3314
3315 static int claim_resources(struct slgt_info *info)
3316 {
3317         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3318                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3319                         info->device_name, info->phys_reg_addr));
3320                 info->init_error = DiagStatus_AddressConflict;
3321                 goto errout;
3322         }
3323         else
3324                 info->reg_addr_requested = 1;
3325
3326         info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3327         if (!info->reg_addr) {
3328                 DBGERR(("%s cant map device registers, addr=%08X\n",
3329                         info->device_name, info->phys_reg_addr));
3330                 info->init_error = DiagStatus_CantAssignPciResources;
3331                 goto errout;
3332         }
3333         return 0;
3334
3335 errout:
3336         release_resources(info);
3337         return -ENODEV;
3338 }
3339
3340 static void release_resources(struct slgt_info *info)
3341 {
3342         if (info->irq_requested) {
3343                 free_irq(info->irq_level, info);
3344                 info->irq_requested = 0;
3345         }
3346
3347         if (info->reg_addr_requested) {
3348                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3349                 info->reg_addr_requested = 0;
3350         }
3351
3352         if (info->reg_addr) {
3353                 iounmap(info->reg_addr);
3354                 info->reg_addr = NULL;
3355         }
3356 }
3357
3358 /* Add the specified device instance data structure to the
3359  * global linked list of devices and increment the device count.
3360  */
3361 static void add_device(struct slgt_info *info)
3362 {
3363         char *devstr;
3364
3365         info->next_device = NULL;
3366         info->line = slgt_device_count;
3367         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3368
3369         if (info->line < MAX_DEVICES) {
3370                 if (maxframe[info->line])
3371                         info->max_frame_size = maxframe[info->line];
3372                 info->dosyncppp = dosyncppp[info->line];
3373         }
3374
3375         slgt_device_count++;
3376
3377         if (!slgt_device_list)
3378                 slgt_device_list = info;
3379         else {
3380                 struct slgt_info *current_dev = slgt_device_list;
3381                 while(current_dev->next_device)
3382                         current_dev = current_dev->next_device;
3383                 current_dev->next_device = info;
3384         }
3385
3386         if (info->max_frame_size < 4096)
3387                 info->max_frame_size = 4096;
3388         else if (info->max_frame_size > 65535)
3389                 info->max_frame_size = 65535;
3390
3391         switch(info->pdev->device) {
3392         case SYNCLINK_GT_DEVICE_ID:
3393                 devstr = "GT";
3394                 break;
3395         case SYNCLINK_GT2_DEVICE_ID:
3396                 devstr = "GT2";
3397                 break;
3398         case SYNCLINK_GT4_DEVICE_ID:
3399                 devstr = "GT4";
3400                 break;
3401         case SYNCLINK_AC_DEVICE_ID:
3402                 devstr = "AC";
3403                 info->params.mode = MGSL_MODE_ASYNC;
3404                 break;
3405         default:
3406                 devstr = "(unknown model)";
3407         }
3408         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3409                 devstr, info->device_name, info->phys_reg_addr,
3410                 info->irq_level, info->max_frame_size);
3411
3412 #if SYNCLINK_GENERIC_HDLC
3413         hdlcdev_init(info);
3414 #endif
3415 }
3416
3417 /*
3418  *  allocate device instance structure, return NULL on failure
3419  */
3420 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3421 {
3422         struct slgt_info *info;
3423
3424         info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3425
3426         if (!info) {
3427                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3428                         driver_name, adapter_num, port_num));
3429         } else {
3430                 info->magic = MGSL_MAGIC;
3431                 INIT_WORK(&info->task, bh_handler);
3432                 info->max_frame_size = 4096;
3433                 info->raw_rx_size = DMABUFSIZE;
3434                 info->close_delay = 5*HZ/10;
3435                 info->closing_wait = 30*HZ;
3436                 init_waitqueue_head(&info->open_wait);
3437                 init_waitqueue_head(&info->close_wait);
3438                 init_waitqueue_head(&info->status_event_wait_q);
3439                 init_waitqueue_head(&info->event_wait_q);
3440                 spin_lock_init(&info->netlock);
3441                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3442                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3443                 info->adapter_num = adapter_num;
3444                 info->port_num = port_num;
3445
3446                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3447                 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3448
3449                 /* Copy configuration info to device instance data */
3450                 info->pdev = pdev;
3451                 info->irq_level = pdev->irq;
3452                 info->phys_reg_addr = pci_resource_start(pdev,0);
3453
3454                 info->bus_type = MGSL_BUS_TYPE_PCI;
3455                 info->irq_flags = IRQF_SHARED;
3456
3457                 info->init_error = -1; /* assume error, set to 0 on successful init */
3458         }
3459
3460         return info;
3461 }
3462
3463 static void device_init(int adapter_num, struct pci_dev *pdev)
3464 {
3465         struct slgt_info *port_array[SLGT_MAX_PORTS];
3466         int i;
3467         int port_count = 1;
3468
3469         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3470                 port_count = 2;
3471         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3472                 port_count = 4;
3473
3474         /* allocate device instances for all ports */
3475         for (i=0; i < port_count; ++i) {
3476                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3477                 if (port_array[i] == NULL) {
3478                         for (--i; i >= 0; --i)
3479                                 kfree(port_array[i]);
3480                         return;
3481                 }
3482         }
3483
3484         /* give copy of port_array to all ports and add to device list  */
3485         for (i=0; i < port_count; ++i) {
3486                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3487                 add_device(port_array[i]);
3488                 port_array[i]->port_count = port_count;
3489                 spin_lock_init(&port_array[i]->lock);
3490         }
3491
3492         /* Allocate and claim adapter resources */
3493         if (!claim_resources(port_array[0])) {
3494
3495                 alloc_dma_bufs(port_array[0]);
3496
3497                 /* copy resource information from first port to others */
3498                 for (i = 1; i < port_count; ++i) {
3499                         port_array[i]->lock      = port_array[0]->lock;
3500                         port_array[i]->irq_level = port_array[0]->irq_level;
3501                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3502                         alloc_dma_bufs(port_array[i]);
3503                 }
3504
3505                 if (request_irq(port_array[0]->irq_level,
3506                                         slgt_interrupt,
3507                                         port_array[0]->irq_flags,
3508                                         port_array[0]->device_name,
3509                                         port_array[0]) < 0) {
3510                         DBGERR(("%s request_irq failed IRQ=%d\n",
3511                                 port_array[0]->device_name,
3512                                 port_array[0]->irq_level));
3513                 } else {
3514                         port_array[0]->irq_requested = 1;
3515                         adapter_test(port_array[0]);
3516                         for (i=1 ; i < port_count ; i++) {
3517                                 port_array[i]->init_error = port_array[0]->init_error;
3518                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3519                         }
3520                 }
3521         }
3522
3523         for (i=0; i < port_count; ++i)
3524                 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3525 }
3526
3527 static int __devinit init_one(struct pci_dev *dev,
3528                               const struct pci_device_id *ent)
3529 {
3530         if (pci_enable_device(dev)) {
3531                 printk("error enabling pci device %p\n", dev);
3532                 return -EIO;
3533         }
3534         pci_set_master(dev);
3535         device_init(slgt_device_count, dev);
3536         return 0;
3537 }
3538
3539 static void __devexit remove_one(struct pci_dev *dev)
3540 {
3541 }
3542
3543 static const struct tty_operations ops = {
3544         .open = open,
3545         .close = close,
3546         .write = write,
3547         .put_char = put_char,
3548         .flush_chars = flush_chars,
3549         .write_room = write_room,
3550         .chars_in_buffer = chars_in_buffer,
3551         .flush_buffer = flush_buffer,
3552         .ioctl = ioctl,
3553         .compat_ioctl = slgt_compat_ioctl,
3554         .throttle = throttle,
3555         .unthrottle = unthrottle,
3556         .send_xchar = send_xchar,
3557         .break_ctl = set_break,
3558         .wait_until_sent = wait_until_sent,
3559         .read_proc = read_proc,
3560         .set_termios = set_termios,
3561         .stop = tx_hold,
3562         .start = tx_release,
3563         .hangup = hangup,
3564         .tiocmget = tiocmget,
3565         .tiocmset = tiocmset,
3566 };
3567
3568 static void slgt_cleanup(void)
3569 {
3570         int rc;
3571         struct slgt_info *info;
3572         struct slgt_info *tmp;
3573
3574         printk("unload %s %s\n", driver_name, driver_version);
3575
3576         if (serial_driver) {
3577                 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3578                         tty_unregister_device(serial_driver, info->line);
3579                 if ((rc = tty_unregister_driver(serial_driver)))
3580                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3581                 put_tty_driver(serial_driver);
3582         }
3583
3584         /* reset devices */
3585         info = slgt_device_list;
3586         while(info) {
3587                 reset_port(info);
3588                 info = info->next_device;
3589         }
3590
3591         /* release devices */
3592         info = slgt_device_list;
3593         while(info) {
3594 #if SYNCLINK_GENERIC_HDLC
3595                 hdlcdev_exit(info);
3596 #endif
3597                 free_dma_bufs(info);
3598                 free_tmp_rbuf(info);
3599                 if (info->port_num == 0)
3600                         release_resources(info);
3601                 tmp = info;
3602                 info = info->next_device;
3603                 kfree(tmp);
3604         }
3605
3606         if (pci_registered)
3607                 pci_unregister_driver(&pci_driver);
3608 }
3609
3610 /*
3611  *  Driver initialization entry point.
3612  */
3613 static int __init slgt_init(void)
3614 {
3615         int rc;
3616
3617         printk("%s %s\n", driver_name, driver_version);
3618
3619         serial_driver = alloc_tty_driver(MAX_DEVICES);
3620         if (!serial_driver) {
3621                 printk("%s can't allocate tty driver\n", driver_name);
3622                 return -ENOMEM;
3623         }
3624
3625         /* Initialize the tty_driver structure */
3626
3627         serial_driver->owner = THIS_MODULE;
3628         serial_driver->driver_name = tty_driver_name;
3629         serial_driver->name = tty_dev_prefix;
3630         serial_driver->major = ttymajor;
3631         serial_driver->minor_start = 64;
3632         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3633         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3634         serial_driver->init_termios = tty_std_termios;
3635         serial_driver->init_termios.c_cflag =
3636                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3637         serial_driver->init_termios.c_ispeed = 9600;
3638         serial_driver->init_termios.c_ospeed = 9600;
3639         serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3640         tty_set_operations(serial_driver, &ops);
3641         if ((rc = tty_register_driver(serial_driver)) < 0) {
3642                 DBGERR(("%s can't register serial driver\n", driver_name));
3643                 put_tty_driver(serial_driver);
3644                 serial_driver = NULL;
3645                 goto error;
3646         }
3647
3648         printk("%s %s, tty major#%d\n",
3649                 driver_name, driver_version,
3650                 serial_driver->major);
3651
3652         slgt_device_count = 0;
3653         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3654                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3655                 goto error;
3656         }
3657         pci_registered = 1;
3658
3659         if (!slgt_device_list)
3660                 printk("%s no devices found\n",driver_name);
3661
3662         return 0;
3663
3664 error:
3665         slgt_cleanup();
3666         return rc;
3667 }
3668
3669 static void __exit slgt_exit(void)
3670 {
3671         slgt_cleanup();
3672 }
3673
3674 module_init(slgt_init);
3675 module_exit(slgt_exit);
3676
3677 /*
3678  * register access routines
3679  */
3680
3681 #define CALC_REGADDR() \
3682         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3683         if (addr >= 0x80) \
3684                 reg_addr += (info->port_num) * 32;
3685
3686 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3687 {
3688         CALC_REGADDR();
3689         return readb((void __iomem *)reg_addr);
3690 }
3691
3692 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3693 {
3694         CALC_REGADDR();
3695         writeb(value, (void __iomem *)reg_addr);
3696 }
3697
3698 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3699 {
3700         CALC_REGADDR();
3701         return readw((void __iomem *)reg_addr);
3702 }
3703
3704 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3705 {
3706         CALC_REGADDR();
3707         writew(value, (void __iomem *)reg_addr);
3708 }
3709
3710 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3711 {
3712         CALC_REGADDR();
3713         return readl((void __iomem *)reg_addr);
3714 }
3715
3716 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3717 {
3718         CALC_REGADDR();
3719         writel(value, (void __iomem *)reg_addr);
3720 }
3721
3722 static void rdma_reset(struct slgt_info *info)
3723 {
3724         unsigned int i;
3725
3726         /* set reset bit */
3727         wr_reg32(info, RDCSR, BIT1);
3728
3729         /* wait for enable bit cleared */
3730         for(i=0 ; i < 1000 ; i++)
3731                 if (!(rd_reg32(info, RDCSR) & BIT0))
3732                         break;
3733 }
3734
3735 static void tdma_reset(struct slgt_info *info)
3736 {
3737         unsigned int i;
3738
3739         /* set reset bit */
3740         wr_reg32(info, TDCSR, BIT1);
3741
3742         /* wait for enable bit cleared */
3743         for(i=0 ; i < 1000 ; i++)
3744                 if (!(rd_reg32(info, TDCSR) & BIT0))
3745                         break;
3746 }
3747
3748 /*
3749  * enable internal loopback
3750  * TxCLK and RxCLK are generated from BRG
3751  * and TxD is looped back to RxD internally.
3752  */
3753 static void enable_loopback(struct slgt_info *info)
3754 {
3755         /* SCR (serial control) BIT2=looopback enable */
3756         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3757
3758         if (info->params.mode != MGSL_MODE_ASYNC) {
3759                 /* CCR (clock control)
3760                  * 07..05  tx clock source (010 = BRG)
3761                  * 04..02  rx clock source (010 = BRG)
3762                  * 01      auxclk enable   (0 = disable)
3763                  * 00      BRG enable      (1 = enable)
3764                  *
3765                  * 0100 1001
3766                  */
3767                 wr_reg8(info, CCR, 0x49);
3768
3769                 /* set speed if available, otherwise use default */
3770                 if (info->params.clock_speed)
3771                         set_rate(info, info->params.clock_speed);
3772                 else
3773                         set_rate(info, 3686400);
3774         }
3775 }
3776
3777 /*
3778  *  set baud rate generator to specified rate
3779  */
3780 static void set_rate(struct slgt_info *info, u32 rate)
3781 {
3782         unsigned int div;
3783         static unsigned int osc = 14745600;
3784
3785         /* div = osc/rate - 1
3786          *
3787          * Round div up if osc/rate is not integer to
3788          * force to next slowest rate.
3789          */
3790
3791         if (rate) {
3792                 div = osc/rate;
3793                 if (!(osc % rate) && div)
3794                         div--;
3795                 wr_reg16(info, BDR, (unsigned short)div);
3796         }
3797 }
3798
3799 static void rx_stop(struct slgt_info *info)
3800 {
3801         unsigned short val;
3802
3803         /* disable and reset receiver */
3804         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3805         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3806         wr_reg16(info, RCR, val);                  /* clear reset bit */
3807
3808         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3809
3810         /* clear pending rx interrupts */
3811         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3812
3813         rdma_reset(info);
3814
3815         info->rx_enabled = 0;
3816         info->rx_restart = 0;
3817 }
3818
3819 static void rx_start(struct slgt_info *info)
3820 {
3821         unsigned short val;
3822
3823         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3824
3825         /* clear pending rx overrun IRQ */
3826         wr_reg16(info, SSR, IRQ_RXOVER);
3827
3828         /* reset and disable receiver */
3829         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3830         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3831         wr_reg16(info, RCR, val);                  /* clear reset bit */
3832
3833         rdma_reset(info);
3834         reset_rbufs(info);
3835
3836         /* set 1st descriptor address */
3837         wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3838
3839         if (info->params.mode != MGSL_MODE_ASYNC) {
3840                 /* enable rx DMA and DMA interrupt */
3841                 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3842         } else {
3843                 /* enable saving of rx status, rx DMA and DMA interrupt */
3844                 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3845         }
3846
3847         slgt_irq_on(info, IRQ_RXOVER);
3848
3849         /* enable receiver */
3850         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3851
3852         info->rx_restart = 0;
3853         info->rx_enabled = 1;
3854 }
3855
3856 static void tx_start(struct slgt_info *info)
3857 {
3858         if (!info->tx_enabled) {
3859                 wr_reg16(info, TCR,
3860                          (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3861                 info->tx_enabled = TRUE;
3862         }
3863
3864         if (info->tx_count) {
3865                 info->drop_rts_on_tx_done = 0;
3866
3867                 if (info->params.mode != MGSL_MODE_ASYNC) {
3868                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3869                                 get_signals(info);
3870                                 if (!(info->signals & SerialSignal_RTS)) {
3871                                         info->signals |= SerialSignal_RTS;
3872                                         set_signals(info);
3873                                         info->drop_rts_on_tx_done = 1;
3874                                 }
3875                         }
3876
3877                         slgt_irq_off(info, IRQ_TXDATA);
3878                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3879                         /* clear tx idle and underrun status bits */
3880                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3881                         if (info->params.mode == MGSL_MODE_HDLC)
3882                                 mod_timer(&info->tx_timer, jiffies +
3883                                                 msecs_to_jiffies(5000));
3884                 } else {
3885                         slgt_irq_off(info, IRQ_TXDATA);
3886                         slgt_irq_on(info, IRQ_TXIDLE);
3887                         /* clear tx idle status bit */
3888                         wr_reg16(info, SSR, IRQ_TXIDLE);
3889                 }
3890                 tdma_start(info);
3891                 info->tx_active = 1;
3892         }
3893 }
3894
3895 /*
3896  * start transmit DMA if inactive and there are unsent buffers
3897  */
3898 static void tdma_start(struct slgt_info *info)
3899 {
3900         unsigned int i;
3901
3902         if (rd_reg32(info, TDCSR) & BIT0)
3903                 return;
3904
3905         /* transmit DMA inactive, check for unsent buffers */
3906         i = info->tbuf_start;
3907         while (!desc_count(info->tbufs[i])) {
3908                 if (++i == info->tbuf_count)
3909                         i = 0;
3910                 if (i == info->tbuf_current)
3911                         return;
3912         }
3913         info->tbuf_start = i;
3914
3915         /* there are unsent buffers, start transmit DMA */
3916
3917         /* reset needed if previous error condition */
3918         tdma_reset(info);
3919
3920         /* set 1st descriptor address */
3921         wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3922         switch(info->params.mode) {
3923         case MGSL_MODE_RAW:
3924         case MGSL_MODE_MONOSYNC:
3925         case MGSL_MODE_BISYNC:
3926                 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3927                 break;
3928         default:
3929                 wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3930         }
3931 }
3932
3933 static void tx_stop(struct slgt_info *info)
3934 {
3935         unsigned short val;
3936
3937         del_timer(&info->tx_timer);
3938
3939         tdma_reset(info);
3940
3941         /* reset and disable transmitter */
3942         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
3943         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3944
3945         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3946
3947         /* clear tx idle and underrun status bit */
3948         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3949
3950         reset_tbufs(info);
3951
3952         info->tx_enabled = 0;
3953         info->tx_active  = 0;
3954 }
3955
3956 static void reset_port(struct slgt_info *info)
3957 {
3958         if (!info->reg_addr)
3959                 return;
3960
3961         tx_stop(info);
3962         rx_stop(info);
3963
3964         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3965         set_signals(info);
3966
3967         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3968 }
3969
3970 static void reset_adapter(struct slgt_info *info)
3971 {
3972         int i;
3973         for (i=0; i < info->port_count; ++i) {
3974                 if (info->port_array[i])
3975                         reset_port(info->port_array[i]);
3976         }
3977 }
3978
3979 static void async_mode(struct slgt_info *info)
3980 {
3981         unsigned short val;
3982
3983         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3984         tx_stop(info);
3985         rx_stop(info);
3986
3987         /* TCR (tx control)
3988          *
3989          * 15..13  mode, 010=async
3990          * 12..10  encoding, 000=NRZ
3991          * 09      parity enable
3992          * 08      1=odd parity, 0=even parity
3993          * 07      1=RTS driver control
3994          * 06      1=break enable
3995          * 05..04  character length
3996          *         00=5 bits
3997          *         01=6 bits
3998          *         10=7 bits
3999          *         11=8 bits
4000          * 03      0=1 stop bit, 1=2 stop bits
4001          * 02      reset
4002          * 01      enable
4003          * 00      auto-CTS enable
4004          */
4005         val = 0x4000;
4006
4007         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4008                 val |= BIT7;
4009
4010         if (info->params.parity != ASYNC_PARITY_NONE) {
4011                 val |= BIT9;
4012                 if (info->params.parity == ASYNC_PARITY_ODD)
4013                         val |= BIT8;
4014         }
4015
4016         switch (info->params.data_bits)
4017         {
4018         case 6: val |= BIT4; break;
4019         case 7: val |= BIT5; break;
4020         case 8: val |= BIT5 + BIT4; break;
4021         }
4022
4023         if (info->params.stop_bits != 1)
4024                 val |= BIT3;
4025
4026         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4027                 val |= BIT0;
4028
4029         wr_reg16(info, TCR, val);
4030
4031         /* RCR (rx control)
4032          *
4033          * 15..13  mode, 010=async
4034          * 12..10  encoding, 000=NRZ
4035          * 09      parity enable
4036          * 08      1=odd parity, 0=even parity
4037          * 07..06  reserved, must be 0
4038          * 05..04  character length
4039          *         00=5 bits
4040          *         01=6 bits
4041          *         10=7 bits
4042          *         11=8 bits
4043          * 03      reserved, must be zero
4044          * 02      reset
4045          * 01      enable
4046          * 00      auto-DCD enable
4047          */
4048         val = 0x4000;
4049
4050         if (info->params.parity != ASYNC_PARITY_NONE) {
4051                 val |= BIT9;
4052                 if (info->params.parity == ASYNC_PARITY_ODD)
4053                         val |= BIT8;
4054         }
4055
4056         switch (info->params.data_bits)
4057         {
4058         case 6: val |= BIT4; break;
4059         case 7: val |= BIT5; break;
4060         case 8: val |= BIT5 + BIT4; break;
4061         }
4062
4063         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4064                 val |= BIT0;
4065
4066         wr_reg16(info, RCR, val);
4067
4068         /* CCR (clock control)
4069          *
4070          * 07..05  011 = tx clock source is BRG/16
4071          * 04..02  010 = rx clock source is BRG
4072          * 01      0 = auxclk disabled
4073          * 00      1 = BRG enabled
4074          *
4075          * 0110 1001
4076          */
4077         wr_reg8(info, CCR, 0x69);
4078
4079         msc_set_vcr(info);
4080
4081         /* SCR (serial control)
4082          *
4083          * 15  1=tx req on FIFO half empty
4084          * 14  1=rx req on FIFO half full
4085          * 13  tx data  IRQ enable
4086          * 12  tx idle  IRQ enable
4087          * 11  rx break on IRQ enable
4088          * 10  rx data  IRQ enable
4089          * 09  rx break off IRQ enable
4090          * 08  overrun  IRQ enable
4091          * 07  DSR      IRQ enable
4092          * 06  CTS      IRQ enable
4093          * 05  DCD      IRQ enable
4094          * 04  RI       IRQ enable
4095          * 03  reserved, must be zero
4096          * 02  1=txd->rxd internal loopback enable
4097          * 01  reserved, must be zero
4098          * 00  1=master IRQ enable
4099          */
4100         val = BIT15 + BIT14 + BIT0;
4101         wr_reg16(info, SCR, val);
4102
4103         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4104
4105         set_rate(info, info->params.data_rate * 16);
4106
4107         if (info->params.loopback)
4108                 enable_loopback(info);
4109 }
4110
4111 static void sync_mode(struct slgt_info *info)
4112 {
4113         unsigned short val;
4114
4115         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4116         tx_stop(info);
4117         rx_stop(info);
4118
4119         /* TCR (tx control)
4120          *
4121          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4122          * 12..10  encoding
4123          * 09      CRC enable
4124          * 08      CRC32
4125          * 07      1=RTS driver control
4126          * 06      preamble enable
4127          * 05..04  preamble length
4128          * 03      share open/close flag
4129          * 02      reset
4130          * 01      enable
4131          * 00      auto-CTS enable
4132          */
4133         val = 0;
4134
4135         switch(info->params.mode) {
4136         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4137         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4138         case MGSL_MODE_RAW:      val |= BIT13; break;
4139         }
4140         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4141                 val |= BIT7;
4142
4143         switch(info->params.encoding)
4144         {
4145         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4146         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4147         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4148         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4149         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4150         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4151         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4152         }
4153
4154         switch (info->params.crc_type & HDLC_CRC_MASK)
4155         {
4156         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4157         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4158         }
4159
4160         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4161                 val |= BIT6;
4162
4163         switch (info->params.preamble_length)
4164         {
4165         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4166         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4167         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4168         }
4169
4170         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4171                 val |= BIT0;
4172
4173         wr_reg16(info, TCR, val);
4174
4175         /* TPR (transmit preamble) */
4176
4177         switch (info->params.preamble)
4178         {
4179         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4180         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4181         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4182         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4183         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4184         default:                          val = 0x7e; break;
4185         }
4186         wr_reg8(info, TPR, (unsigned char)val);
4187
4188         /* RCR (rx control)
4189          *
4190          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4191          * 12..10  encoding
4192          * 09      CRC enable
4193          * 08      CRC32
4194          * 07..03  reserved, must be 0
4195          * 02      reset
4196          * 01      enable
4197          * 00      auto-DCD enable
4198          */
4199         val = 0;
4200
4201         switch(info->params.mode) {
4202         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4203         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4204         case MGSL_MODE_RAW:      val |= BIT13; break;
4205         }
4206
4207         switch(info->params.encoding)
4208         {
4209         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4210         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4211         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4212         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4213         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4214         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4215         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4216         }
4217
4218         switch (info->params.crc_type & HDLC_CRC_MASK)
4219         {
4220         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4221         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4222         }
4223
4224         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4225                 val |= BIT0;
4226
4227         wr_reg16(info, RCR, val);
4228
4229         /* CCR (clock control)
4230          *
4231          * 07..05  tx clock source
4232          * 04..02  rx clock source
4233          * 01      auxclk enable
4234          * 00      BRG enable
4235          */
4236         val = 0;
4237
4238         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4239         {
4240                 // when RxC source is DPLL, BRG generates 16X DPLL
4241                 // reference clock, so take TxC from BRG/16 to get
4242                 // transmit clock at actual data rate
4243                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4244                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4245                 else
4246                         val |= BIT6;    /* 010, txclk = BRG */
4247         }
4248         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4249                 val |= BIT7;    /* 100, txclk = DPLL Input */
4250         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4251                 val |= BIT5;    /* 001, txclk = RXC Input */
4252
4253         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4254                 val |= BIT3;    /* 010, rxclk = BRG */
4255         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4256                 val |= BIT4;    /* 100, rxclk = DPLL */
4257         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4258                 val |= BIT2;    /* 001, rxclk = TXC Input */
4259
4260         if (info->params.clock_speed)
4261                 val |= BIT1 + BIT0;
4262
4263         wr_reg8(info, CCR, (unsigned char)val);
4264
4265         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4266         {
4267                 // program DPLL mode
4268                 switch(info->params.encoding)
4269                 {
4270                 case HDLC_ENCODING_BIPHASE_MARK:
4271                 case HDLC_ENCODING_BIPHASE_SPACE:
4272                         val = BIT7; break;
4273                 case HDLC_ENCODING_BIPHASE_LEVEL:
4274                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4275                         val = BIT7 + BIT6; break;
4276                 default: val = BIT6;    // NRZ encodings
4277                 }
4278                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4279
4280                 // DPLL requires a 16X reference clock from BRG
4281                 set_rate(info, info->params.clock_speed * 16);
4282         }
4283         else
4284                 set_rate(info, info->params.clock_speed);
4285
4286         tx_set_idle(info);
4287
4288         msc_set_vcr(info);
4289
4290         /* SCR (serial control)
4291          *
4292          * 15  1=tx req on FIFO half empty
4293          * 14  1=rx req on FIFO half full
4294          * 13  tx data  IRQ enable
4295          * 12  tx idle  IRQ enable
4296          * 11  underrun IRQ enable
4297          * 10  rx data  IRQ enable
4298          * 09  rx idle  IRQ enable
4299          * 08  overrun  IRQ enable
4300          * 07  DSR      IRQ enable
4301          * 06  CTS      IRQ enable
4302          * 05  DCD      IRQ enable
4303          * 04  RI       IRQ enable
4304          * 03  reserved, must be zero
4305          * 02  1=txd->rxd internal loopback enable
4306          * 01  reserved, must be zero
4307          * 00  1=master IRQ enable
4308          */
4309         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4310
4311         if (info->params.loopback)
4312                 enable_loopback(info);
4313 }
4314
4315 /*
4316  *  set transmit idle mode
4317  */
4318 static void tx_set_idle(struct slgt_info *info)
4319 {
4320         unsigned char val;
4321         unsigned short tcr;
4322
4323         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4324          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4325          */
4326         tcr = rd_reg16(info, TCR);
4327         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4328                 /* disable preamble, set idle size to 16 bits */
4329                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4330                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4331                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4332         } else if (!(tcr & BIT6)) {
4333                 /* preamble is disabled, set idle size to 8 bits */
4334                 tcr &= ~(BIT5 + BIT4);
4335         }
4336         wr_reg16(info, TCR, tcr);
4337
4338         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4339                 /* LSB of custom tx idle specified in tx idle register */
4340                 val = (unsigned char)(info->idle_mode & 0xff);
4341         } else {
4342                 /* standard 8 bit idle patterns */
4343                 switch(info->idle_mode)
4344                 {
4345                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4346                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4347                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4348                 case HDLC_TXIDLE_ZEROS:
4349                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4350                 default:                         val = 0xff;
4351                 }
4352         }
4353
4354         wr_reg8(info, TIR, val);
4355 }
4356
4357 /*
4358  * get state of V24 status (input) signals
4359  */
4360 static void get_signals(struct slgt_info *info)
4361 {
4362         unsigned short status = rd_reg16(info, SSR);
4363
4364         /* clear all serial signals except DTR and RTS */
4365         info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4366
4367         if (status & BIT3)
4368                 info->signals |= SerialSignal_DSR;
4369         if (status & BIT2)
4370                 info->signals |= SerialSignal_CTS;
4371         if (status & BIT1)
4372                 info->signals |= SerialSignal_DCD;
4373         if (status & BIT0)
4374                 info->signals |= SerialSignal_RI;
4375 }
4376
4377 /*
4378  * set V.24 Control Register based on current configuration
4379  */
4380 static void msc_set_vcr(struct slgt_info *info)
4381 {
4382         unsigned char val = 0;
4383
4384         /* VCR (V.24 control)
4385          *
4386          * 07..04  serial IF select
4387          * 03      DTR
4388          * 02      RTS
4389          * 01      LL
4390          * 00      RL
4391          */
4392
4393         switch(info->if_mode & MGSL_INTERFACE_MASK)
4394         {
4395         case MGSL_INTERFACE_RS232:
4396                 val |= BIT5; /* 0010 */
4397                 break;
4398         case MGSL_INTERFACE_V35:
4399                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4400                 break;
4401         case MGSL_INTERFACE_RS422:
4402                 val |= BIT6; /* 0100 */
4403                 break;
4404         }
4405
4406         if (info->signals & SerialSignal_DTR)
4407                 val |= BIT3;
4408         if (info->signals & SerialSignal_RTS)
4409                 val |= BIT2;
4410         if (info->if_mode & MGSL_INTERFACE_LL)
4411                 val |= BIT1;
4412         if (info->if_mode & MGSL_INTERFACE_RL)
4413                 val |= BIT0;
4414         wr_reg8(info, VCR, val);
4415 }
4416
4417 /*
4418  * set state of V24 control (output) signals
4419  */
4420 static void set_signals(struct slgt_info *info)
4421 {
4422         unsigned char val = rd_reg8(info, VCR);
4423         if (info->signals & SerialSignal_DTR)
4424                 val |= BIT3;
4425         else
4426                 val &= ~BIT3;
4427         if (info->signals & SerialSignal_RTS)
4428                 val |= BIT2;
4429         else
4430                 val &= ~BIT2;
4431         wr_reg8(info, VCR, val);
4432 }
4433
4434 /*
4435  * free range of receive DMA buffers (i to last)
4436  */
4437 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4438 {
4439         int done = 0;
4440
4441         while(!done) {
4442                 /* reset current buffer for reuse */
4443                 info->rbufs[i].status = 0;
4444                 switch(info->params.mode) {
4445                 case MGSL_MODE_RAW:
4446                 case MGSL_MODE_MONOSYNC:
4447                 case MGSL_MODE_BISYNC:
4448                         set_desc_count(info->rbufs[i], info->raw_rx_size);
4449                         break;
4450                 default:
4451                         set_desc_count(info->rbufs[i], DMABUFSIZE);
4452                 }
4453
4454                 if (i == last)
4455                         done = 1;
4456                 if (++i == info->rbuf_count)
4457                         i = 0;
4458         }
4459         info->rbuf_current = i;
4460 }
4461
4462 /*
4463  * mark all receive DMA buffers as free
4464  */
4465 static void reset_rbufs(struct slgt_info *info)
4466 {
4467         free_rbufs(info, 0, info->rbuf_count - 1);
4468 }
4469
4470 /*
4471  * pass receive HDLC frame to upper layer
4472  *
4473  * return 1 if frame available, otherwise 0
4474  */
4475 static int rx_get_frame(struct slgt_info *info)
4476 {
4477         unsigned int start, end;
4478         unsigned short status;
4479         unsigned int framesize = 0;
4480         int rc = 0;
4481         unsigned long flags;
4482         struct tty_struct *tty = info->tty;
4483         unsigned char addr_field = 0xff;
4484         unsigned int crc_size = 0;
4485
4486         switch (info->params.crc_type & HDLC_CRC_MASK) {
4487         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4488         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4489         }
4490
4491 check_again:
4492
4493         framesize = 0;
4494         addr_field = 0xff;
4495         start = end = info->rbuf_current;
4496
4497         for (;;) {
4498                 if (!desc_complete(info->rbufs[end]))
4499                         goto cleanup;
4500
4501                 if (framesize == 0 && info->params.addr_filter != 0xff)
4502                         addr_field = info->rbufs[end].buf[0];
4503
4504                 framesize += desc_count(info->rbufs[end]);
4505
4506                 if (desc_eof(info->rbufs[end]))
4507                         break;
4508
4509                 if (++end == info->rbuf_count)
4510                         end = 0;
4511
4512                 if (end == info->rbuf_current) {
4513                         if (info->rx_enabled){
4514                                 spin_lock_irqsave(&info->lock,flags);
4515                                 rx_start(info);
4516                                 spin_unlock_irqrestore(&info->lock,flags);
4517                         }
4518                         goto cleanup;
4519                 }
4520         }
4521
4522         /* status
4523          *
4524          * 15      buffer complete
4525          * 14..06  reserved
4526          * 05..04  residue
4527          * 02      eof (end of frame)
4528          * 01      CRC error
4529          * 00      abort
4530          */
4531         status = desc_status(info->rbufs[end]);
4532
4533         /* ignore CRC bit if not using CRC (bit is undefined) */
4534         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4535                 status &= ~BIT1;
4536
4537         if (framesize == 0 ||
4538                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4539                 free_rbufs(info, start, end);
4540                 goto check_again;
4541         }
4542
4543         if (framesize < (2 + crc_size) || status & BIT0) {
4544                 info->icount.rxshort++;
4545                 framesize = 0;
4546         } else if (status & BIT1) {
4547                 info->icount.rxcrc++;
4548                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4549                         framesize = 0;
4550         }
4551
4552 #if SYNCLINK_GENERIC_HDLC
4553         if (framesize == 0) {
4554                 struct net_device_stats *stats = hdlc_stats(info->netdev);
4555                 stats->rx_errors++;
4556                 stats->rx_frame_errors++;
4557         }
4558 #endif
4559
4560         DBGBH(("%s rx frame status=%04X size=%d\n",
4561                 info->device_name, status, framesize));
4562         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
4563
4564         if (framesize) {
4565                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4566                         framesize -= crc_size;
4567                         crc_size = 0;
4568                 }
4569
4570                 if (framesize > info->max_frame_size + crc_size)
4571                         info->icount.rxlong++;
4572                 else {
4573                         /* copy dma buffer(s) to contiguous temp buffer */
4574                         int copy_count = framesize;
4575                         int i = start;
4576                         unsigned char *p = info->tmp_rbuf;
4577                         info->tmp_rbuf_count = framesize;
4578
4579                         info->icount.rxok++;
4580
4581                         while(copy_count) {
4582                                 int partial_count = min(copy_count, DMABUFSIZE);
4583                                 memcpy(p, info->rbufs[i].buf, partial_count);
4584                                 p += partial_count;
4585                                 copy_count -= partial_count;
4586                                 if (++i == info->rbuf_count)
4587                                         i = 0;
4588                         }
4589
4590                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4591                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4592                                 framesize++;
4593                         }
4594
4595 #if SYNCLINK_GENERIC_HDLC
4596                         if (info->netcount)
4597                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4598                         else
4599 #endif
4600                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4601                 }
4602         }
4603         free_rbufs(info, start, end);
4604         rc = 1;
4605
4606 cleanup:
4607         return rc;
4608 }
4609
4610 /*
4611  * pass receive buffer (RAW synchronous mode) to tty layer
4612  * return 1 if buffer available, otherwise 0
4613  */
4614 static int rx_get_buf(struct slgt_info *info)
4615 {
4616         unsigned int i = info->rbuf_current;
4617         unsigned int count;
4618
4619         if (!desc_complete(info->rbufs[i]))
4620                 return 0;
4621         count = desc_count(info->rbufs[i]);
4622         switch(info->params.mode) {
4623         case MGSL_MODE_MONOSYNC:
4624         case MGSL_MODE_BISYNC:
4625                 /* ignore residue in byte synchronous modes */
4626                 if (desc_residue(info->rbufs[i]))
4627                         count--;
4628                 break;
4629         }
4630         DBGDATA(info, info->rbufs[i].buf, count, "rx");
4631         DBGINFO(("rx_get_buf size=%d\n", count));
4632         if (count)
4633                 ldisc_receive_buf(info->tty, info->rbufs[i].buf,
4634                                   info->flag_buf, count);
4635         free_rbufs(info, i, i);
4636         return 1;
4637 }
4638
4639 static void reset_tbufs(struct slgt_info *info)
4640 {
4641         unsigned int i;
4642         info->tbuf_current = 0;
4643         for (i=0 ; i < info->tbuf_count ; i++) {
4644                 info->tbufs[i].status = 0;
4645                 info->tbufs[i].count  = 0;
4646         }
4647 }
4648
4649 /*
4650  * return number of free transmit DMA buffers
4651  */
4652 static unsigned int free_tbuf_count(struct slgt_info *info)
4653 {
4654         unsigned int count = 0;
4655         unsigned int i = info->tbuf_current;
4656
4657         do
4658         {
4659                 if (desc_count(info->tbufs[i]))
4660                         break; /* buffer in use */
4661                 ++count;
4662                 if (++i == info->tbuf_count)
4663                         i=0;
4664         } while (i != info->tbuf_current);
4665
4666         /* if tx DMA active, last zero count buffer is in use */
4667         if (count && (rd_reg32(info, TDCSR) & BIT0))
4668                 --count;
4669
4670         return count;
4671 }
4672
4673 /*
4674  * load transmit DMA buffer(s) with data
4675  */
4676 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4677 {
4678         unsigned short count;
4679         unsigned int i;
4680         struct slgt_desc *d;
4681
4682         if (size == 0)
4683                 return;
4684
4685         DBGDATA(info, buf, size, "tx");
4686
4687         info->tbuf_start = i = info->tbuf_current;
4688
4689         while (size) {
4690                 d = &info->tbufs[i];
4691                 if (++i == info->tbuf_count)
4692                         i = 0;
4693
4694                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4695                 memcpy(d->buf, buf, count);
4696
4697                 size -= count;
4698                 buf  += count;
4699
4700                 /*
4701                  * set EOF bit for last buffer of HDLC frame or
4702                  * for every buffer in raw mode
4703                  */
4704                 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4705                     info->params.mode == MGSL_MODE_RAW)
4706                         set_desc_eof(*d, 1);
4707                 else
4708                         set_desc_eof(*d, 0);
4709
4710                 set_desc_count(*d, count);
4711         }
4712
4713         info->tbuf_current = i;
4714 }
4715
4716 static int register_test(struct slgt_info *info)
4717 {
4718         static unsigned short patterns[] =
4719                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4720         static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4721         unsigned int i;
4722         int rc = 0;
4723
4724         for (i=0 ; i < count ; i++) {
4725                 wr_reg16(info, TIR, patterns[i]);
4726                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4727                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4728                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4729                         rc = -ENODEV;
4730                         break;
4731                 }
4732         }
4733         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4734         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4735         return rc;
4736 }
4737
4738 static int irq_test(struct slgt_info *info)
4739 {
4740         unsigned long timeout;
4741         unsigned long flags;
4742         struct tty_struct *oldtty = info->tty;
4743         u32 speed = info->params.data_rate;
4744
4745         info->params.data_rate = 921600;
4746         info->tty = NULL;
4747
4748         spin_lock_irqsave(&info->lock, flags);
4749         async_mode(info);
4750         slgt_irq_on(info, IRQ_TXIDLE);
4751
4752         /* enable transmitter */
4753         wr_reg16(info, TCR,
4754                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4755
4756         /* write one byte and wait for tx idle */
4757         wr_reg16(info, TDR, 0);
4758
4759         /* assume failure */
4760         info->init_error = DiagStatus_IrqFailure;
4761         info->irq_occurred = FALSE;
4762
4763         spin_unlock_irqrestore(&info->lock, flags);
4764
4765         timeout=100;
4766         while(timeout-- && !info->irq_occurred)
4767                 msleep_interruptible(10);
4768
4769         spin_lock_irqsave(&info->lock,flags);
4770         reset_port(info);
4771         spin_unlock_irqrestore(&info->lock,flags);
4772
4773         info->params.data_rate = speed;
4774         info->tty = oldtty;
4775
4776         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4777         return info->irq_occurred ? 0 : -ENODEV;
4778 }
4779
4780 static int loopback_test_rx(struct slgt_info *info)
4781 {
4782         unsigned char *src, *dest;
4783         int count;
4784
4785         if (desc_complete(info->rbufs[0])) {
4786                 count = desc_count(info->rbufs[0]);
4787                 src   = info->rbufs[0].buf;
4788                 dest  = info->tmp_rbuf;
4789
4790                 for( ; count ; count-=2, src+=2) {
4791                         /* src=data byte (src+1)=status byte */
4792                         if (!(*(src+1) & (BIT9 + BIT8))) {
4793                                 *dest = *src;
4794                                 dest++;
4795                                 info->tmp_rbuf_count++;
4796                         }
4797                 }
4798                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4799                 return 1;
4800         }
4801         return 0;
4802 }
4803
4804 static int loopback_test(struct slgt_info *info)
4805 {
4806 #define TESTFRAMESIZE 20
4807
4808         unsigned long timeout;
4809         u16 count = TESTFRAMESIZE;
4810         unsigned char buf[TESTFRAMESIZE];
4811         int rc = -ENODEV;
4812         unsigned long flags;
4813
4814         struct tty_struct *oldtty = info->tty;
4815         MGSL_PARAMS params;
4816
4817         memcpy(&params, &info->params, sizeof(params));
4818
4819         info->params.mode = MGSL_MODE_ASYNC;
4820         info->params.data_rate = 921600;
4821         info->params.loopback = 1;
4822         info->tty = NULL;
4823
4824         /* build and send transmit frame */
4825         for (count = 0; count < TESTFRAMESIZE; ++count)
4826                 buf[count] = (unsigned char)count;
4827
4828         info->tmp_rbuf_count = 0;
4829         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4830
4831         /* program hardware for HDLC and enabled receiver */
4832         spin_lock_irqsave(&info->lock,flags);
4833         async_mode(info);
4834         rx_start(info);
4835         info->tx_count = count;
4836         tx_load(info, buf, count);
4837         tx_start(info);
4838         spin_unlock_irqrestore(&info->lock, flags);
4839
4840         /* wait for receive complete */
4841         for (timeout = 100; timeout; --timeout) {
4842                 msleep_interruptible(10);
4843                 if (loopback_test_rx(info)) {
4844                         rc = 0;
4845                         break;
4846                 }
4847         }
4848
4849         /* verify received frame length and contents */
4850         if (!rc && (info->tmp_rbuf_count != count ||
4851                   memcmp(buf, info->tmp_rbuf, count))) {
4852                 rc = -ENODEV;
4853         }
4854
4855         spin_lock_irqsave(&info->lock,flags);
4856         reset_adapter(info);
4857         spin_unlock_irqrestore(&info->lock,flags);
4858
4859         memcpy(&info->params, &params, sizeof(info->params));
4860         info->tty = oldtty;
4861
4862         info->init_error = rc ? DiagStatus_DmaFailure : 0;
4863         return rc;
4864 }
4865
4866 static int adapter_test(struct slgt_info *info)
4867 {
4868         DBGINFO(("testing %s\n", info->device_name));
4869         if (register_test(info) < 0) {
4870                 printk("register test failure %s addr=%08X\n",
4871                         info->device_name, info->phys_reg_addr);
4872         } else if (irq_test(info) < 0) {
4873                 printk("IRQ test failure %s IRQ=%d\n",
4874                         info->device_name, info->irq_level);
4875         } else if (loopback_test(info) < 0) {
4876                 printk("loopback test failure %s\n", info->device_name);
4877         }
4878         return info->init_error;
4879 }
4880
4881 /*
4882  * transmit timeout handler
4883  */
4884 static void tx_timeout(unsigned long context)
4885 {
4886         struct slgt_info *info = (struct slgt_info*)context;
4887         unsigned long flags;
4888
4889         DBGINFO(("%s tx_timeout\n", info->device_name));
4890         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4891                 info->icount.txtimeout++;
4892         }
4893         spin_lock_irqsave(&info->lock,flags);
4894         info->tx_active = 0;
4895         info->tx_count = 0;
4896         spin_unlock_irqrestore(&info->lock,flags);
4897
4898 #if SYNCLINK_GENERIC_HDLC
4899         if (info->netcount)
4900                 hdlcdev_tx_done(info);
4901         else
4902 #endif
4903                 bh_transmit(info);
4904 }
4905
4906 /*
4907  * receive buffer polling timer
4908  */
4909 static void rx_timeout(unsigned long context)
4910 {
4911         struct slgt_info *info = (struct slgt_info*)context;
4912         unsigned long flags;
4913
4914         DBGINFO(("%s rx_timeout\n", info->device_name));
4915         spin_lock_irqsave(&info->lock, flags);
4916         info->pending_bh |= BH_RECEIVE;
4917         spin_unlock_irqrestore(&info->lock, flags);
4918         bh_handler(&info->task);
4919 }
4920