readahead: combine file_ra_state.prev_index/prev_offset into prev_pos
[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
77 #include <asm/system.h>
78 #include <asm/io.h>
79 #include <asm/irq.h>
80 #include <asm/dma.h>
81 #include <asm/types.h>
82 #include <asm/uaccess.h>
83
84 #include "linux/synclink.h"
85
86 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
87 #define SYNCLINK_GENERIC_HDLC 1
88 #else
89 #define SYNCLINK_GENERIC_HDLC 0
90 #endif
91
92 /*
93  * module identification
94  */
95 static char *driver_name     = "SyncLink GT";
96 static char *driver_version  = "$Revision: 4.50 $";
97 static char *tty_driver_name = "synclink_gt";
98 static char *tty_dev_prefix  = "ttySLG";
99 MODULE_LICENSE("GPL");
100 #define MGSL_MAGIC 0x5401
101 #define MAX_DEVICES 32
102
103 static struct pci_device_id pci_table[] = {
104         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
108         {0,}, /* terminate list */
109 };
110 MODULE_DEVICE_TABLE(pci, pci_table);
111
112 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
113 static void remove_one(struct pci_dev *dev);
114 static struct pci_driver pci_driver = {
115         .name           = "synclink_gt",
116         .id_table       = pci_table,
117         .probe          = init_one,
118         .remove         = __devexit_p(remove_one),
119 };
120
121 static int pci_registered;
122
123 /*
124  * module configuration and status
125  */
126 static struct slgt_info *slgt_device_list;
127 static int slgt_device_count;
128
129 static int ttymajor;
130 static int debug_level;
131 static int maxframe[MAX_DEVICES];
132 static int dosyncppp[MAX_DEVICES];
133
134 module_param(ttymajor, int, 0);
135 module_param(debug_level, int, 0);
136 module_param_array(maxframe, int, NULL, 0);
137 module_param_array(dosyncppp, int, NULL, 0);
138
139 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
140 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
141 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
142 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
143
144 /*
145  * tty support and callbacks
146  */
147 static struct tty_driver *serial_driver;
148
149 static int  open(struct tty_struct *tty, struct file * filp);
150 static void close(struct tty_struct *tty, struct file * filp);
151 static void hangup(struct tty_struct *tty);
152 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
153
154 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
155 static void put_char(struct tty_struct *tty, unsigned char ch);
156 static void send_xchar(struct tty_struct *tty, char ch);
157 static void wait_until_sent(struct tty_struct *tty, int timeout);
158 static int  write_room(struct tty_struct *tty);
159 static void flush_chars(struct tty_struct *tty);
160 static void flush_buffer(struct tty_struct *tty);
161 static void tx_hold(struct tty_struct *tty);
162 static void tx_release(struct tty_struct *tty);
163
164 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
165 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
166 static int  chars_in_buffer(struct tty_struct *tty);
167 static void throttle(struct tty_struct * tty);
168 static void unthrottle(struct tty_struct * tty);
169 static void set_break(struct tty_struct *tty, int break_state);
170
171 /*
172  * generic HDLC support and callbacks
173  */
174 #if SYNCLINK_GENERIC_HDLC
175 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
176 static void hdlcdev_tx_done(struct slgt_info *info);
177 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
178 static int  hdlcdev_init(struct slgt_info *info);
179 static void hdlcdev_exit(struct slgt_info *info);
180 #endif
181
182
183 /*
184  * device specific structures, macros and functions
185  */
186
187 #define SLGT_MAX_PORTS 4
188 #define SLGT_REG_SIZE  256
189
190 /*
191  * conditional wait facility
192  */
193 struct cond_wait {
194         struct cond_wait *next;
195         wait_queue_head_t q;
196         wait_queue_t wait;
197         unsigned int data;
198 };
199 static void init_cond_wait(struct cond_wait *w, unsigned int data);
200 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
201 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
202 static void flush_cond_wait(struct cond_wait **head);
203
204 /*
205  * DMA buffer descriptor and access macros
206  */
207 struct slgt_desc
208 {
209         __le16 count;
210         __le16 status;
211         __le32 pbuf;  /* physical address of data buffer */
212         __le32 next;  /* physical address of next descriptor */
213
214         /* driver book keeping */
215         char *buf;          /* virtual  address of data buffer */
216         unsigned int pdesc; /* physical address of this descriptor */
217         dma_addr_t buf_dma_addr;
218 };
219
220 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
221 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
222 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
223 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
224 #define desc_count(a)      (le16_to_cpu((a).count))
225 #define desc_status(a)     (le16_to_cpu((a).status))
226 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
227 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
228 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
229 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
230 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
231
232 struct _input_signal_events {
233         int ri_up;
234         int ri_down;
235         int dsr_up;
236         int dsr_down;
237         int dcd_up;
238         int dcd_down;
239         int cts_up;
240         int cts_down;
241 };
242
243 /*
244  * device instance data structure
245  */
246 struct slgt_info {
247         void *if_ptr;           /* General purpose pointer (used by SPPP) */
248
249         struct slgt_info *next_device;  /* device list link */
250
251         int magic;
252         int flags;
253
254         char device_name[25];
255         struct pci_dev *pdev;
256
257         int port_count;  /* count of ports on adapter */
258         int adapter_num; /* adapter instance number */
259         int port_num;    /* port instance number */
260
261         /* array of pointers to port contexts on this adapter */
262         struct slgt_info *port_array[SLGT_MAX_PORTS];
263
264         int                     count;          /* count of opens */
265         int                     line;           /* tty line instance number */
266         unsigned short          close_delay;
267         unsigned short          closing_wait;   /* time to wait before closing */
268
269         struct mgsl_icount      icount;
270
271         struct tty_struct       *tty;
272         int                     timeout;
273         int                     x_char;         /* xon/xoff character */
274         int                     blocked_open;   /* # of blocked opens */
275         unsigned int            read_status_mask;
276         unsigned int            ignore_status_mask;
277
278         wait_queue_head_t       open_wait;
279         wait_queue_head_t       close_wait;
280
281         wait_queue_head_t       status_event_wait_q;
282         wait_queue_head_t       event_wait_q;
283         struct timer_list       tx_timer;
284         struct timer_list       rx_timer;
285
286         unsigned int            gpio_present;
287         struct cond_wait        *gpio_wait_q;
288
289         spinlock_t lock;        /* spinlock for synchronizing with ISR */
290
291         struct work_struct task;
292         u32 pending_bh;
293         int bh_requested;
294         int bh_running;
295
296         int isr_overflow;
297         int irq_requested;      /* nonzero if IRQ requested */
298         int irq_occurred;       /* for diagnostics use */
299
300         /* device configuration */
301
302         unsigned int bus_type;
303         unsigned int irq_level;
304         unsigned long irq_flags;
305
306         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
307         u32 phys_reg_addr;
308         int reg_addr_requested;
309
310         MGSL_PARAMS params;       /* communications parameters */
311         u32 idle_mode;
312         u32 max_frame_size;       /* as set by device config */
313
314         unsigned int raw_rx_size;
315         unsigned int if_mode;
316
317         /* device status */
318
319         int rx_enabled;
320         int rx_restart;
321
322         int tx_enabled;
323         int tx_active;
324
325         unsigned char signals;    /* serial signal states */
326         int init_error;  /* initialization error */
327
328         unsigned char *tx_buf;
329         int tx_count;
330
331         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
332         char char_buf[MAX_ASYNC_BUFFER_SIZE];
333         BOOLEAN drop_rts_on_tx_done;
334         struct  _input_signal_events    input_signal_events;
335
336         int dcd_chkcount;       /* check counts to prevent */
337         int cts_chkcount;       /* too many IRQs if a signal */
338         int dsr_chkcount;       /* is floating */
339         int ri_chkcount;
340
341         char *bufs;             /* virtual address of DMA buffer lists */
342         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
343
344         unsigned int rbuf_count;
345         struct slgt_desc *rbufs;
346         unsigned int rbuf_current;
347         unsigned int rbuf_index;
348
349         unsigned int tbuf_count;
350         struct slgt_desc *tbufs;
351         unsigned int tbuf_current;
352         unsigned int tbuf_start;
353
354         unsigned char *tmp_rbuf;
355         unsigned int tmp_rbuf_count;
356
357         /* SPPP/Cisco HDLC device parts */
358
359         int netcount;
360         int dosyncppp;
361         spinlock_t netlock;
362 #if SYNCLINK_GENERIC_HDLC
363         struct net_device *netdev;
364 #endif
365
366 };
367
368 static MGSL_PARAMS default_params = {
369         .mode            = MGSL_MODE_HDLC,
370         .loopback        = 0,
371         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
372         .encoding        = HDLC_ENCODING_NRZI_SPACE,
373         .clock_speed     = 0,
374         .addr_filter     = 0xff,
375         .crc_type        = HDLC_CRC_16_CCITT,
376         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
377         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
378         .data_rate       = 9600,
379         .data_bits       = 8,
380         .stop_bits       = 1,
381         .parity          = ASYNC_PARITY_NONE
382 };
383
384
385 #define BH_RECEIVE  1
386 #define BH_TRANSMIT 2
387 #define BH_STATUS   4
388 #define IO_PIN_SHUTDOWN_LIMIT 100
389
390 #define DMABUFSIZE 256
391 #define DESC_LIST_SIZE 4096
392
393 #define MASK_PARITY  BIT1
394 #define MASK_FRAMING BIT0
395 #define MASK_BREAK   BIT14
396 #define MASK_OVERRUN BIT4
397
398 #define GSR   0x00 /* global status */
399 #define JCR   0x04 /* JTAG control */
400 #define IODR  0x08 /* GPIO direction */
401 #define IOER  0x0c /* GPIO interrupt enable */
402 #define IOVR  0x10 /* GPIO value */
403 #define IOSR  0x14 /* GPIO interrupt status */
404 #define TDR   0x80 /* tx data */
405 #define RDR   0x80 /* rx data */
406 #define TCR   0x82 /* tx control */
407 #define TIR   0x84 /* tx idle */
408 #define TPR   0x85 /* tx preamble */
409 #define RCR   0x86 /* rx control */
410 #define VCR   0x88 /* V.24 control */
411 #define CCR   0x89 /* clock control */
412 #define BDR   0x8a /* baud divisor */
413 #define SCR   0x8c /* serial control */
414 #define SSR   0x8e /* serial status */
415 #define RDCSR 0x90 /* rx DMA control/status */
416 #define TDCSR 0x94 /* tx DMA control/status */
417 #define RDDAR 0x98 /* rx DMA descriptor address */
418 #define TDDAR 0x9c /* tx DMA descriptor address */
419
420 #define RXIDLE      BIT14
421 #define RXBREAK     BIT14
422 #define IRQ_TXDATA  BIT13
423 #define IRQ_TXIDLE  BIT12
424 #define IRQ_TXUNDER BIT11 /* HDLC */
425 #define IRQ_RXDATA  BIT10
426 #define IRQ_RXIDLE  BIT9  /* HDLC */
427 #define IRQ_RXBREAK BIT9  /* async */
428 #define IRQ_RXOVER  BIT8
429 #define IRQ_DSR     BIT7
430 #define IRQ_CTS     BIT6
431 #define IRQ_DCD     BIT5
432 #define IRQ_RI      BIT4
433 #define IRQ_ALL     0x3ff0
434 #define IRQ_MASTER  BIT0
435
436 #define slgt_irq_on(info, mask) \
437         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
438 #define slgt_irq_off(info, mask) \
439         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
440
441 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
442 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
443 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
444 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
445 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
446 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
447
448 static void  msc_set_vcr(struct slgt_info *info);
449
450 static int  startup(struct slgt_info *info);
451 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
452 static void shutdown(struct slgt_info *info);
453 static void program_hw(struct slgt_info *info);
454 static void change_params(struct slgt_info *info);
455
456 static int  register_test(struct slgt_info *info);
457 static int  irq_test(struct slgt_info *info);
458 static int  loopback_test(struct slgt_info *info);
459 static int  adapter_test(struct slgt_info *info);
460
461 static void reset_adapter(struct slgt_info *info);
462 static void reset_port(struct slgt_info *info);
463 static void async_mode(struct slgt_info *info);
464 static void sync_mode(struct slgt_info *info);
465
466 static void rx_stop(struct slgt_info *info);
467 static void rx_start(struct slgt_info *info);
468 static void reset_rbufs(struct slgt_info *info);
469 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
470 static void rdma_reset(struct slgt_info *info);
471 static int  rx_get_frame(struct slgt_info *info);
472 static int  rx_get_buf(struct slgt_info *info);
473
474 static void tx_start(struct slgt_info *info);
475 static void tx_stop(struct slgt_info *info);
476 static void tx_set_idle(struct slgt_info *info);
477 static unsigned int free_tbuf_count(struct slgt_info *info);
478 static void reset_tbufs(struct slgt_info *info);
479 static void tdma_reset(struct slgt_info *info);
480 static void tdma_start(struct slgt_info *info);
481 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
482
483 static void get_signals(struct slgt_info *info);
484 static void set_signals(struct slgt_info *info);
485 static void enable_loopback(struct slgt_info *info);
486 static void set_rate(struct slgt_info *info, u32 data_rate);
487
488 static int  bh_action(struct slgt_info *info);
489 static void bh_handler(struct work_struct *work);
490 static void bh_transmit(struct slgt_info *info);
491 static void isr_serial(struct slgt_info *info);
492 static void isr_rdma(struct slgt_info *info);
493 static void isr_txeom(struct slgt_info *info, unsigned short status);
494 static void isr_tdma(struct slgt_info *info);
495 static irqreturn_t slgt_interrupt(int irq, void *dev_id);
496
497 static int  alloc_dma_bufs(struct slgt_info *info);
498 static void free_dma_bufs(struct slgt_info *info);
499 static int  alloc_desc(struct slgt_info *info);
500 static void free_desc(struct slgt_info *info);
501 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
502 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
503
504 static int  alloc_tmp_rbuf(struct slgt_info *info);
505 static void free_tmp_rbuf(struct slgt_info *info);
506
507 static void tx_timeout(unsigned long context);
508 static void rx_timeout(unsigned long context);
509
510 /*
511  * ioctl handlers
512  */
513 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
514 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
515 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
516 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
517 static int  set_txidle(struct slgt_info *info, int idle_mode);
518 static int  tx_enable(struct slgt_info *info, int enable);
519 static int  tx_abort(struct slgt_info *info);
520 static int  rx_enable(struct slgt_info *info, int enable);
521 static int  modem_input_wait(struct slgt_info *info,int arg);
522 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
523 static int  tiocmget(struct tty_struct *tty, struct file *file);
524 static int  tiocmset(struct tty_struct *tty, struct file *file,
525                      unsigned int set, unsigned int clear);
526 static void set_break(struct tty_struct *tty, int break_state);
527 static int  get_interface(struct slgt_info *info, int __user *if_mode);
528 static int  set_interface(struct slgt_info *info, int if_mode);
529 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
530 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
531 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
532
533 /*
534  * driver functions
535  */
536 static void add_device(struct slgt_info *info);
537 static void device_init(int adapter_num, struct pci_dev *pdev);
538 static int  claim_resources(struct slgt_info *info);
539 static void release_resources(struct slgt_info *info);
540
541 /*
542  * DEBUG OUTPUT CODE
543  */
544 #ifndef DBGINFO
545 #define DBGINFO(fmt)
546 #endif
547 #ifndef DBGERR
548 #define DBGERR(fmt)
549 #endif
550 #ifndef DBGBH
551 #define DBGBH(fmt)
552 #endif
553 #ifndef DBGISR
554 #define DBGISR(fmt)
555 #endif
556
557 #ifdef DBGDATA
558 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
559 {
560         int i;
561         int linecount;
562         printk("%s %s data:\n",info->device_name, label);
563         while(count) {
564                 linecount = (count > 16) ? 16 : count;
565                 for(i=0; i < linecount; i++)
566                         printk("%02X ",(unsigned char)data[i]);
567                 for(;i<17;i++)
568                         printk("   ");
569                 for(i=0;i<linecount;i++) {
570                         if (data[i]>=040 && data[i]<=0176)
571                                 printk("%c",data[i]);
572                         else
573                                 printk(".");
574                 }
575                 printk("\n");
576                 data  += linecount;
577                 count -= linecount;
578         }
579 }
580 #else
581 #define DBGDATA(info, buf, size, label)
582 #endif
583
584 #ifdef DBGTBUF
585 static void dump_tbufs(struct slgt_info *info)
586 {
587         int i;
588         printk("tbuf_current=%d\n", info->tbuf_current);
589         for (i=0 ; i < info->tbuf_count ; i++) {
590                 printk("%d: count=%04X status=%04X\n",
591                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
592         }
593 }
594 #else
595 #define DBGTBUF(info)
596 #endif
597
598 #ifdef DBGRBUF
599 static void dump_rbufs(struct slgt_info *info)
600 {
601         int i;
602         printk("rbuf_current=%d\n", info->rbuf_current);
603         for (i=0 ; i < info->rbuf_count ; i++) {
604                 printk("%d: count=%04X status=%04X\n",
605                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
606         }
607 }
608 #else
609 #define DBGRBUF(info)
610 #endif
611
612 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
613 {
614 #ifdef SANITY_CHECK
615         if (!info) {
616                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
617                 return 1;
618         }
619         if (info->magic != MGSL_MAGIC) {
620                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
621                 return 1;
622         }
623 #else
624         if (!info)
625                 return 1;
626 #endif
627         return 0;
628 }
629
630 /**
631  * line discipline callback wrappers
632  *
633  * The wrappers maintain line discipline references
634  * while calling into the line discipline.
635  *
636  * ldisc_receive_buf  - pass receive data to line discipline
637  */
638 static void ldisc_receive_buf(struct tty_struct *tty,
639                               const __u8 *data, char *flags, int count)
640 {
641         struct tty_ldisc *ld;
642         if (!tty)
643                 return;
644         ld = tty_ldisc_ref(tty);
645         if (ld) {
646                 if (ld->receive_buf)
647                         ld->receive_buf(tty, data, flags, count);
648                 tty_ldisc_deref(ld);
649         }
650 }
651
652 /* tty callbacks */
653
654 static int open(struct tty_struct *tty, struct file *filp)
655 {
656         struct slgt_info *info;
657         int retval, line;
658         unsigned long flags;
659
660         line = tty->index;
661         if ((line < 0) || (line >= slgt_device_count)) {
662                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
663                 return -ENODEV;
664         }
665
666         info = slgt_device_list;
667         while(info && info->line != line)
668                 info = info->next_device;
669         if (sanity_check(info, tty->name, "open"))
670                 return -ENODEV;
671         if (info->init_error) {
672                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
673                 return -ENODEV;
674         }
675
676         tty->driver_data = info;
677         info->tty = tty;
678
679         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
680
681         /* If port is closing, signal caller to try again */
682         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
683                 if (info->flags & ASYNC_CLOSING)
684                         interruptible_sleep_on(&info->close_wait);
685                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
686                         -EAGAIN : -ERESTARTSYS);
687                 goto cleanup;
688         }
689
690         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
691
692         spin_lock_irqsave(&info->netlock, flags);
693         if (info->netcount) {
694                 retval = -EBUSY;
695                 spin_unlock_irqrestore(&info->netlock, flags);
696                 goto cleanup;
697         }
698         info->count++;
699         spin_unlock_irqrestore(&info->netlock, flags);
700
701         if (info->count == 1) {
702                 /* 1st open on this device, init hardware */
703                 retval = startup(info);
704                 if (retval < 0)
705                         goto cleanup;
706         }
707
708         retval = block_til_ready(tty, filp, info);
709         if (retval) {
710                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
711                 goto cleanup;
712         }
713
714         retval = 0;
715
716 cleanup:
717         if (retval) {
718                 if (tty->count == 1)
719                         info->tty = NULL; /* tty layer will release tty struct */
720                 if(info->count)
721                         info->count--;
722         }
723
724         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
725         return retval;
726 }
727
728 static void close(struct tty_struct *tty, struct file *filp)
729 {
730         struct slgt_info *info = tty->driver_data;
731
732         if (sanity_check(info, tty->name, "close"))
733                 return;
734         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
735
736         if (!info->count)
737                 return;
738
739         if (tty_hung_up_p(filp))
740                 goto cleanup;
741
742         if ((tty->count == 1) && (info->count != 1)) {
743                 /*
744                  * tty->count is 1 and the tty structure will be freed.
745                  * info->count should be one in this case.
746                  * if it's not, correct it so that the port is shutdown.
747                  */
748                 DBGERR(("%s close: bad refcount; tty->count=1, "
749                        "info->count=%d\n", info->device_name, info->count));
750                 info->count = 1;
751         }
752
753         info->count--;
754
755         /* if at least one open remaining, leave hardware active */
756         if (info->count)
757                 goto cleanup;
758
759         info->flags |= ASYNC_CLOSING;
760
761         /* set tty->closing to notify line discipline to
762          * only process XON/XOFF characters. Only the N_TTY
763          * discipline appears to use this (ppp does not).
764          */
765         tty->closing = 1;
766
767         /* wait for transmit data to clear all layers */
768
769         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
770                 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
771                 tty_wait_until_sent(tty, info->closing_wait);
772         }
773
774         if (info->flags & ASYNC_INITIALIZED)
775                 wait_until_sent(tty, info->timeout);
776         if (tty->driver->flush_buffer)
777                 tty->driver->flush_buffer(tty);
778         tty_ldisc_flush(tty);
779
780         shutdown(info);
781
782         tty->closing = 0;
783         info->tty = NULL;
784
785         if (info->blocked_open) {
786                 if (info->close_delay) {
787                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
788                 }
789                 wake_up_interruptible(&info->open_wait);
790         }
791
792         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
793
794         wake_up_interruptible(&info->close_wait);
795
796 cleanup:
797         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
798 }
799
800 static void hangup(struct tty_struct *tty)
801 {
802         struct slgt_info *info = tty->driver_data;
803
804         if (sanity_check(info, tty->name, "hangup"))
805                 return;
806         DBGINFO(("%s hangup\n", info->device_name));
807
808         flush_buffer(tty);
809         shutdown(info);
810
811         info->count = 0;
812         info->flags &= ~ASYNC_NORMAL_ACTIVE;
813         info->tty = NULL;
814
815         wake_up_interruptible(&info->open_wait);
816 }
817
818 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
819 {
820         struct slgt_info *info = tty->driver_data;
821         unsigned long flags;
822
823         DBGINFO(("%s set_termios\n", tty->driver->name));
824
825         change_params(info);
826
827         /* Handle transition to B0 status */
828         if (old_termios->c_cflag & CBAUD &&
829             !(tty->termios->c_cflag & CBAUD)) {
830                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
831                 spin_lock_irqsave(&info->lock,flags);
832                 set_signals(info);
833                 spin_unlock_irqrestore(&info->lock,flags);
834         }
835
836         /* Handle transition away from B0 status */
837         if (!(old_termios->c_cflag & CBAUD) &&
838             tty->termios->c_cflag & CBAUD) {
839                 info->signals |= SerialSignal_DTR;
840                 if (!(tty->termios->c_cflag & CRTSCTS) ||
841                     !test_bit(TTY_THROTTLED, &tty->flags)) {
842                         info->signals |= SerialSignal_RTS;
843                 }
844                 spin_lock_irqsave(&info->lock,flags);
845                 set_signals(info);
846                 spin_unlock_irqrestore(&info->lock,flags);
847         }
848
849         /* Handle turning off CRTSCTS */
850         if (old_termios->c_cflag & CRTSCTS &&
851             !(tty->termios->c_cflag & CRTSCTS)) {
852                 tty->hw_stopped = 0;
853                 tx_release(tty);
854         }
855 }
856
857 static int write(struct tty_struct *tty,
858                  const unsigned char *buf, int count)
859 {
860         int ret = 0;
861         struct slgt_info *info = tty->driver_data;
862         unsigned long flags;
863
864         if (sanity_check(info, tty->name, "write"))
865                 goto cleanup;
866         DBGINFO(("%s write count=%d\n", info->device_name, count));
867
868         if (!info->tx_buf)
869                 goto cleanup;
870
871         if (count > info->max_frame_size) {
872                 ret = -EIO;
873                 goto cleanup;
874         }
875
876         if (!count)
877                 goto cleanup;
878
879         if (info->params.mode == MGSL_MODE_RAW ||
880             info->params.mode == MGSL_MODE_MONOSYNC ||
881             info->params.mode == MGSL_MODE_BISYNC) {
882                 unsigned int bufs_needed = (count/DMABUFSIZE);
883                 unsigned int bufs_free = free_tbuf_count(info);
884                 if (count % DMABUFSIZE)
885                         ++bufs_needed;
886                 if (bufs_needed > bufs_free)
887                         goto cleanup;
888         } else {
889                 if (info->tx_active)
890                         goto cleanup;
891                 if (info->tx_count) {
892                         /* send accumulated data from send_char() calls */
893                         /* as frame and wait before accepting more data. */
894                         tx_load(info, info->tx_buf, info->tx_count);
895                         goto start;
896                 }
897         }
898
899         ret = info->tx_count = count;
900         tx_load(info, buf, count);
901         goto start;
902
903 start:
904         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
905                 spin_lock_irqsave(&info->lock,flags);
906                 if (!info->tx_active)
907                         tx_start(info);
908                 else
909                         tdma_start(info);
910                 spin_unlock_irqrestore(&info->lock,flags);
911         }
912
913 cleanup:
914         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
915         return ret;
916 }
917
918 static void put_char(struct tty_struct *tty, unsigned char ch)
919 {
920         struct slgt_info *info = tty->driver_data;
921         unsigned long flags;
922
923         if (sanity_check(info, tty->name, "put_char"))
924                 return;
925         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
926         if (!info->tx_buf)
927                 return;
928         spin_lock_irqsave(&info->lock,flags);
929         if (!info->tx_active && (info->tx_count < info->max_frame_size))
930                 info->tx_buf[info->tx_count++] = ch;
931         spin_unlock_irqrestore(&info->lock,flags);
932 }
933
934 static void send_xchar(struct tty_struct *tty, char ch)
935 {
936         struct slgt_info *info = tty->driver_data;
937         unsigned long flags;
938
939         if (sanity_check(info, tty->name, "send_xchar"))
940                 return;
941         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
942         info->x_char = ch;
943         if (ch) {
944                 spin_lock_irqsave(&info->lock,flags);
945                 if (!info->tx_enabled)
946                         tx_start(info);
947                 spin_unlock_irqrestore(&info->lock,flags);
948         }
949 }
950
951 static void wait_until_sent(struct tty_struct *tty, int timeout)
952 {
953         struct slgt_info *info = tty->driver_data;
954         unsigned long orig_jiffies, char_time;
955
956         if (!info )
957                 return;
958         if (sanity_check(info, tty->name, "wait_until_sent"))
959                 return;
960         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
961         if (!(info->flags & ASYNC_INITIALIZED))
962                 goto exit;
963
964         orig_jiffies = jiffies;
965
966         /* Set check interval to 1/5 of estimated time to
967          * send a character, and make it at least 1. The check
968          * interval should also be less than the timeout.
969          * Note: use tight timings here to satisfy the NIST-PCTS.
970          */
971
972         if (info->params.data_rate) {
973                 char_time = info->timeout/(32 * 5);
974                 if (!char_time)
975                         char_time++;
976         } else
977                 char_time = 1;
978
979         if (timeout)
980                 char_time = min_t(unsigned long, char_time, timeout);
981
982         while (info->tx_active) {
983                 msleep_interruptible(jiffies_to_msecs(char_time));
984                 if (signal_pending(current))
985                         break;
986                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
987                         break;
988         }
989
990 exit:
991         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
992 }
993
994 static int write_room(struct tty_struct *tty)
995 {
996         struct slgt_info *info = tty->driver_data;
997         int ret;
998
999         if (sanity_check(info, tty->name, "write_room"))
1000                 return 0;
1001         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1002         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
1003         return ret;
1004 }
1005
1006 static void flush_chars(struct tty_struct *tty)
1007 {
1008         struct slgt_info *info = tty->driver_data;
1009         unsigned long flags;
1010
1011         if (sanity_check(info, tty->name, "flush_chars"))
1012                 return;
1013         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1014
1015         if (info->tx_count <= 0 || tty->stopped ||
1016             tty->hw_stopped || !info->tx_buf)
1017                 return;
1018
1019         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1020
1021         spin_lock_irqsave(&info->lock,flags);
1022         if (!info->tx_active && info->tx_count) {
1023                 tx_load(info, info->tx_buf,info->tx_count);
1024                 tx_start(info);
1025         }
1026         spin_unlock_irqrestore(&info->lock,flags);
1027 }
1028
1029 static void flush_buffer(struct tty_struct *tty)
1030 {
1031         struct slgt_info *info = tty->driver_data;
1032         unsigned long flags;
1033
1034         if (sanity_check(info, tty->name, "flush_buffer"))
1035                 return;
1036         DBGINFO(("%s flush_buffer\n", info->device_name));
1037
1038         spin_lock_irqsave(&info->lock,flags);
1039         if (!info->tx_active)
1040                 info->tx_count = 0;
1041         spin_unlock_irqrestore(&info->lock,flags);
1042
1043         tty_wakeup(tty);
1044 }
1045
1046 /*
1047  * throttle (stop) transmitter
1048  */
1049 static void tx_hold(struct tty_struct *tty)
1050 {
1051         struct slgt_info *info = tty->driver_data;
1052         unsigned long flags;
1053
1054         if (sanity_check(info, tty->name, "tx_hold"))
1055                 return;
1056         DBGINFO(("%s tx_hold\n", info->device_name));
1057         spin_lock_irqsave(&info->lock,flags);
1058         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1059                 tx_stop(info);
1060         spin_unlock_irqrestore(&info->lock,flags);
1061 }
1062
1063 /*
1064  * release (start) transmitter
1065  */
1066 static void tx_release(struct tty_struct *tty)
1067 {
1068         struct slgt_info *info = tty->driver_data;
1069         unsigned long flags;
1070
1071         if (sanity_check(info, tty->name, "tx_release"))
1072                 return;
1073         DBGINFO(("%s tx_release\n", info->device_name));
1074         spin_lock_irqsave(&info->lock,flags);
1075         if (!info->tx_active && info->tx_count) {
1076                 tx_load(info, info->tx_buf, info->tx_count);
1077                 tx_start(info);
1078         }
1079         spin_unlock_irqrestore(&info->lock,flags);
1080 }
1081
1082 /*
1083  * Service an IOCTL request
1084  *
1085  * Arguments
1086  *
1087  *      tty     pointer to tty instance data
1088  *      file    pointer to associated file object for device
1089  *      cmd     IOCTL command code
1090  *      arg     command argument/context
1091  *
1092  * Return 0 if success, otherwise error code
1093  */
1094 static int ioctl(struct tty_struct *tty, struct file *file,
1095                  unsigned int cmd, unsigned long arg)
1096 {
1097         struct slgt_info *info = tty->driver_data;
1098         struct mgsl_icount cnow;        /* kernel counter temps */
1099         struct serial_icounter_struct __user *p_cuser;  /* user space */
1100         unsigned long flags;
1101         void __user *argp = (void __user *)arg;
1102
1103         if (sanity_check(info, tty->name, "ioctl"))
1104                 return -ENODEV;
1105         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1106
1107         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1108             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1109                 if (tty->flags & (1 << TTY_IO_ERROR))
1110                     return -EIO;
1111         }
1112
1113         switch (cmd) {
1114         case MGSL_IOCGPARAMS:
1115                 return get_params(info, argp);
1116         case MGSL_IOCSPARAMS:
1117                 return set_params(info, argp);
1118         case MGSL_IOCGTXIDLE:
1119                 return get_txidle(info, argp);
1120         case MGSL_IOCSTXIDLE:
1121                 return set_txidle(info, (int)arg);
1122         case MGSL_IOCTXENABLE:
1123                 return tx_enable(info, (int)arg);
1124         case MGSL_IOCRXENABLE:
1125                 return rx_enable(info, (int)arg);
1126         case MGSL_IOCTXABORT:
1127                 return tx_abort(info);
1128         case MGSL_IOCGSTATS:
1129                 return get_stats(info, argp);
1130         case MGSL_IOCWAITEVENT:
1131                 return wait_mgsl_event(info, argp);
1132         case TIOCMIWAIT:
1133                 return modem_input_wait(info,(int)arg);
1134         case MGSL_IOCGIF:
1135                 return get_interface(info, argp);
1136         case MGSL_IOCSIF:
1137                 return set_interface(info,(int)arg);
1138         case MGSL_IOCSGPIO:
1139                 return set_gpio(info, argp);
1140         case MGSL_IOCGGPIO:
1141                 return get_gpio(info, argp);
1142         case MGSL_IOCWAITGPIO:
1143                 return wait_gpio(info, argp);
1144         case TIOCGICOUNT:
1145                 spin_lock_irqsave(&info->lock,flags);
1146                 cnow = info->icount;
1147                 spin_unlock_irqrestore(&info->lock,flags);
1148                 p_cuser = argp;
1149                 if (put_user(cnow.cts, &p_cuser->cts) ||
1150                     put_user(cnow.dsr, &p_cuser->dsr) ||
1151                     put_user(cnow.rng, &p_cuser->rng) ||
1152                     put_user(cnow.dcd, &p_cuser->dcd) ||
1153                     put_user(cnow.rx, &p_cuser->rx) ||
1154                     put_user(cnow.tx, &p_cuser->tx) ||
1155                     put_user(cnow.frame, &p_cuser->frame) ||
1156                     put_user(cnow.overrun, &p_cuser->overrun) ||
1157                     put_user(cnow.parity, &p_cuser->parity) ||
1158                     put_user(cnow.brk, &p_cuser->brk) ||
1159                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1160                         return -EFAULT;
1161                 return 0;
1162         default:
1163                 return -ENOIOCTLCMD;
1164         }
1165         return 0;
1166 }
1167
1168 /*
1169  * support for 32 bit ioctl calls on 64 bit systems
1170  */
1171 #ifdef CONFIG_COMPAT
1172 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1173 {
1174         struct MGSL_PARAMS32 tmp_params;
1175
1176         DBGINFO(("%s get_params32\n", info->device_name));
1177         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1178         tmp_params.loopback        = info->params.loopback;
1179         tmp_params.flags           = info->params.flags;
1180         tmp_params.encoding        = info->params.encoding;
1181         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1182         tmp_params.addr_filter     = info->params.addr_filter;
1183         tmp_params.crc_type        = info->params.crc_type;
1184         tmp_params.preamble_length = info->params.preamble_length;
1185         tmp_params.preamble        = info->params.preamble;
1186         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1187         tmp_params.data_bits       = info->params.data_bits;
1188         tmp_params.stop_bits       = info->params.stop_bits;
1189         tmp_params.parity          = info->params.parity;
1190         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1191                 return -EFAULT;
1192         return 0;
1193 }
1194
1195 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1196 {
1197         struct MGSL_PARAMS32 tmp_params;
1198
1199         DBGINFO(("%s set_params32\n", info->device_name));
1200         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1201                 return -EFAULT;
1202
1203         spin_lock(&info->lock);
1204         info->params.mode            = tmp_params.mode;
1205         info->params.loopback        = tmp_params.loopback;
1206         info->params.flags           = tmp_params.flags;
1207         info->params.encoding        = tmp_params.encoding;
1208         info->params.clock_speed     = tmp_params.clock_speed;
1209         info->params.addr_filter     = tmp_params.addr_filter;
1210         info->params.crc_type        = tmp_params.crc_type;
1211         info->params.preamble_length = tmp_params.preamble_length;
1212         info->params.preamble        = tmp_params.preamble;
1213         info->params.data_rate       = tmp_params.data_rate;
1214         info->params.data_bits       = tmp_params.data_bits;
1215         info->params.stop_bits       = tmp_params.stop_bits;
1216         info->params.parity          = tmp_params.parity;
1217         spin_unlock(&info->lock);
1218
1219         change_params(info);
1220
1221         return 0;
1222 }
1223
1224 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1225                          unsigned int cmd, unsigned long arg)
1226 {
1227         struct slgt_info *info = tty->driver_data;
1228         int rc = -ENOIOCTLCMD;
1229
1230         if (sanity_check(info, tty->name, "compat_ioctl"))
1231                 return -ENODEV;
1232         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1233
1234         switch (cmd) {
1235
1236         case MGSL_IOCSPARAMS32:
1237                 rc = set_params32(info, compat_ptr(arg));
1238                 break;
1239
1240         case MGSL_IOCGPARAMS32:
1241                 rc = get_params32(info, compat_ptr(arg));
1242                 break;
1243
1244         case MGSL_IOCGPARAMS:
1245         case MGSL_IOCSPARAMS:
1246         case MGSL_IOCGTXIDLE:
1247         case MGSL_IOCGSTATS:
1248         case MGSL_IOCWAITEVENT:
1249         case MGSL_IOCGIF:
1250         case MGSL_IOCSGPIO:
1251         case MGSL_IOCGGPIO:
1252         case MGSL_IOCWAITGPIO:
1253         case TIOCGICOUNT:
1254                 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1255                 break;
1256
1257         case MGSL_IOCSTXIDLE:
1258         case MGSL_IOCTXENABLE:
1259         case MGSL_IOCRXENABLE:
1260         case MGSL_IOCTXABORT:
1261         case TIOCMIWAIT:
1262         case MGSL_IOCSIF:
1263                 rc = ioctl(tty, file, cmd, arg);
1264                 break;
1265         }
1266
1267         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1268         return rc;
1269 }
1270 #else
1271 #define slgt_compat_ioctl NULL
1272 #endif /* ifdef CONFIG_COMPAT */
1273
1274 /*
1275  * proc fs support
1276  */
1277 static inline int line_info(char *buf, struct slgt_info *info)
1278 {
1279         char stat_buf[30];
1280         int ret;
1281         unsigned long flags;
1282
1283         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1284                       info->device_name, info->phys_reg_addr,
1285                       info->irq_level, info->max_frame_size);
1286
1287         /* output current serial signal states */
1288         spin_lock_irqsave(&info->lock,flags);
1289         get_signals(info);
1290         spin_unlock_irqrestore(&info->lock,flags);
1291
1292         stat_buf[0] = 0;
1293         stat_buf[1] = 0;
1294         if (info->signals & SerialSignal_RTS)
1295                 strcat(stat_buf, "|RTS");
1296         if (info->signals & SerialSignal_CTS)
1297                 strcat(stat_buf, "|CTS");
1298         if (info->signals & SerialSignal_DTR)
1299                 strcat(stat_buf, "|DTR");
1300         if (info->signals & SerialSignal_DSR)
1301                 strcat(stat_buf, "|DSR");
1302         if (info->signals & SerialSignal_DCD)
1303                 strcat(stat_buf, "|CD");
1304         if (info->signals & SerialSignal_RI)
1305                 strcat(stat_buf, "|RI");
1306
1307         if (info->params.mode != MGSL_MODE_ASYNC) {
1308                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1309                                info->icount.txok, info->icount.rxok);
1310                 if (info->icount.txunder)
1311                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1312                 if (info->icount.txabort)
1313                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1314                 if (info->icount.rxshort)
1315                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1316                 if (info->icount.rxlong)
1317                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1318                 if (info->icount.rxover)
1319                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1320                 if (info->icount.rxcrc)
1321                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1322         } else {
1323                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1324                                info->icount.tx, info->icount.rx);
1325                 if (info->icount.frame)
1326                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1327                 if (info->icount.parity)
1328                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1329                 if (info->icount.brk)
1330                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1331                 if (info->icount.overrun)
1332                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1333         }
1334
1335         /* Append serial signal status to end */
1336         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1337
1338         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1339                        info->tx_active,info->bh_requested,info->bh_running,
1340                        info->pending_bh);
1341
1342         return ret;
1343 }
1344
1345 /* Called to print information about devices
1346  */
1347 static int read_proc(char *page, char **start, off_t off, int count,
1348                      int *eof, void *data)
1349 {
1350         int len = 0, l;
1351         off_t   begin = 0;
1352         struct slgt_info *info;
1353
1354         len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1355
1356         info = slgt_device_list;
1357         while( info ) {
1358                 l = line_info(page + len, info);
1359                 len += l;
1360                 if (len+begin > off+count)
1361                         goto done;
1362                 if (len+begin < off) {
1363                         begin += len;
1364                         len = 0;
1365                 }
1366                 info = info->next_device;
1367         }
1368
1369         *eof = 1;
1370 done:
1371         if (off >= len+begin)
1372                 return 0;
1373         *start = page + (off-begin);
1374         return ((count < begin+len-off) ? count : begin+len-off);
1375 }
1376
1377 /*
1378  * return count of bytes in transmit buffer
1379  */
1380 static int chars_in_buffer(struct tty_struct *tty)
1381 {
1382         struct slgt_info *info = tty->driver_data;
1383         if (sanity_check(info, tty->name, "chars_in_buffer"))
1384                 return 0;
1385         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1386         return info->tx_count;
1387 }
1388
1389 /*
1390  * signal remote device to throttle send data (our receive data)
1391  */
1392 static void throttle(struct tty_struct * tty)
1393 {
1394         struct slgt_info *info = tty->driver_data;
1395         unsigned long flags;
1396
1397         if (sanity_check(info, tty->name, "throttle"))
1398                 return;
1399         DBGINFO(("%s throttle\n", info->device_name));
1400         if (I_IXOFF(tty))
1401                 send_xchar(tty, STOP_CHAR(tty));
1402         if (tty->termios->c_cflag & CRTSCTS) {
1403                 spin_lock_irqsave(&info->lock,flags);
1404                 info->signals &= ~SerialSignal_RTS;
1405                 set_signals(info);
1406                 spin_unlock_irqrestore(&info->lock,flags);
1407         }
1408 }
1409
1410 /*
1411  * signal remote device to stop throttling send data (our receive data)
1412  */
1413 static void unthrottle(struct tty_struct * tty)
1414 {
1415         struct slgt_info *info = tty->driver_data;
1416         unsigned long flags;
1417
1418         if (sanity_check(info, tty->name, "unthrottle"))
1419                 return;
1420         DBGINFO(("%s unthrottle\n", info->device_name));
1421         if (I_IXOFF(tty)) {
1422                 if (info->x_char)
1423                         info->x_char = 0;
1424                 else
1425                         send_xchar(tty, START_CHAR(tty));
1426         }
1427         if (tty->termios->c_cflag & CRTSCTS) {
1428                 spin_lock_irqsave(&info->lock,flags);
1429                 info->signals |= SerialSignal_RTS;
1430                 set_signals(info);
1431                 spin_unlock_irqrestore(&info->lock,flags);
1432         }
1433 }
1434
1435 /*
1436  * set or clear transmit break condition
1437  * break_state  -1=set break condition, 0=clear
1438  */
1439 static void set_break(struct tty_struct *tty, int break_state)
1440 {
1441         struct slgt_info *info = tty->driver_data;
1442         unsigned short value;
1443         unsigned long flags;
1444
1445         if (sanity_check(info, tty->name, "set_break"))
1446                 return;
1447         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1448
1449         spin_lock_irqsave(&info->lock,flags);
1450         value = rd_reg16(info, TCR);
1451         if (break_state == -1)
1452                 value |= BIT6;
1453         else
1454                 value &= ~BIT6;
1455         wr_reg16(info, TCR, value);
1456         spin_unlock_irqrestore(&info->lock,flags);
1457 }
1458
1459 #if SYNCLINK_GENERIC_HDLC
1460
1461 /**
1462  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1463  * set encoding and frame check sequence (FCS) options
1464  *
1465  * dev       pointer to network device structure
1466  * encoding  serial encoding setting
1467  * parity    FCS setting
1468  *
1469  * returns 0 if success, otherwise error code
1470  */
1471 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1472                           unsigned short parity)
1473 {
1474         struct slgt_info *info = dev_to_port(dev);
1475         unsigned char  new_encoding;
1476         unsigned short new_crctype;
1477
1478         /* return error if TTY interface open */
1479         if (info->count)
1480                 return -EBUSY;
1481
1482         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1483
1484         switch (encoding)
1485         {
1486         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1487         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1488         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1489         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1490         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1491         default: return -EINVAL;
1492         }
1493
1494         switch (parity)
1495         {
1496         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1497         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1498         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1499         default: return -EINVAL;
1500         }
1501
1502         info->params.encoding = new_encoding;
1503         info->params.crc_type = new_crctype;
1504
1505         /* if network interface up, reprogram hardware */
1506         if (info->netcount)
1507                 program_hw(info);
1508
1509         return 0;
1510 }
1511
1512 /**
1513  * called by generic HDLC layer to send frame
1514  *
1515  * skb  socket buffer containing HDLC frame
1516  * dev  pointer to network device structure
1517  *
1518  * returns 0 if success, otherwise error code
1519  */
1520 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1521 {
1522         struct slgt_info *info = dev_to_port(dev);
1523         struct net_device_stats *stats = hdlc_stats(dev);
1524         unsigned long flags;
1525
1526         DBGINFO(("%s hdlc_xmit\n", dev->name));
1527
1528         /* stop sending until this frame completes */
1529         netif_stop_queue(dev);
1530
1531         /* copy data to device buffers */
1532         info->tx_count = skb->len;
1533         tx_load(info, skb->data, skb->len);
1534
1535         /* update network statistics */
1536         stats->tx_packets++;
1537         stats->tx_bytes += skb->len;
1538
1539         /* done with socket buffer, so free it */
1540         dev_kfree_skb(skb);
1541
1542         /* save start time for transmit timeout detection */
1543         dev->trans_start = jiffies;
1544
1545         /* start hardware transmitter if necessary */
1546         spin_lock_irqsave(&info->lock,flags);
1547         if (!info->tx_active)
1548                 tx_start(info);
1549         spin_unlock_irqrestore(&info->lock,flags);
1550
1551         return 0;
1552 }
1553
1554 /**
1555  * called by network layer when interface enabled
1556  * claim resources and initialize hardware
1557  *
1558  * dev  pointer to network device structure
1559  *
1560  * returns 0 if success, otherwise error code
1561  */
1562 static int hdlcdev_open(struct net_device *dev)
1563 {
1564         struct slgt_info *info = dev_to_port(dev);
1565         int rc;
1566         unsigned long flags;
1567
1568         if (!try_module_get(THIS_MODULE))
1569                 return -EBUSY;
1570
1571         DBGINFO(("%s hdlcdev_open\n", dev->name));
1572
1573         /* generic HDLC layer open processing */
1574         if ((rc = hdlc_open(dev)))
1575                 return rc;
1576
1577         /* arbitrate between network and tty opens */
1578         spin_lock_irqsave(&info->netlock, flags);
1579         if (info->count != 0 || info->netcount != 0) {
1580                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1581                 spin_unlock_irqrestore(&info->netlock, flags);
1582                 return -EBUSY;
1583         }
1584         info->netcount=1;
1585         spin_unlock_irqrestore(&info->netlock, flags);
1586
1587         /* claim resources and init adapter */
1588         if ((rc = startup(info)) != 0) {
1589                 spin_lock_irqsave(&info->netlock, flags);
1590                 info->netcount=0;
1591                 spin_unlock_irqrestore(&info->netlock, flags);
1592                 return rc;
1593         }
1594
1595         /* assert DTR and RTS, apply hardware settings */
1596         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1597         program_hw(info);
1598
1599         /* enable network layer transmit */
1600         dev->trans_start = jiffies;
1601         netif_start_queue(dev);
1602
1603         /* inform generic HDLC layer of current DCD status */
1604         spin_lock_irqsave(&info->lock, flags);
1605         get_signals(info);
1606         spin_unlock_irqrestore(&info->lock, flags);
1607         if (info->signals & SerialSignal_DCD)
1608                 netif_carrier_on(dev);
1609         else
1610                 netif_carrier_off(dev);
1611         return 0;
1612 }
1613
1614 /**
1615  * called by network layer when interface is disabled
1616  * shutdown hardware and release resources
1617  *
1618  * dev  pointer to network device structure
1619  *
1620  * returns 0 if success, otherwise error code
1621  */
1622 static int hdlcdev_close(struct net_device *dev)
1623 {
1624         struct slgt_info *info = dev_to_port(dev);
1625         unsigned long flags;
1626
1627         DBGINFO(("%s hdlcdev_close\n", dev->name));
1628
1629         netif_stop_queue(dev);
1630
1631         /* shutdown adapter and release resources */
1632         shutdown(info);
1633
1634         hdlc_close(dev);
1635
1636         spin_lock_irqsave(&info->netlock, flags);
1637         info->netcount=0;
1638         spin_unlock_irqrestore(&info->netlock, flags);
1639
1640         module_put(THIS_MODULE);
1641         return 0;
1642 }
1643
1644 /**
1645  * called by network layer to process IOCTL call to network device
1646  *
1647  * dev  pointer to network device structure
1648  * ifr  pointer to network interface request structure
1649  * cmd  IOCTL command code
1650  *
1651  * returns 0 if success, otherwise error code
1652  */
1653 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1654 {
1655         const size_t size = sizeof(sync_serial_settings);
1656         sync_serial_settings new_line;
1657         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1658         struct slgt_info *info = dev_to_port(dev);
1659         unsigned int flags;
1660
1661         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1662
1663         /* return error if TTY interface open */
1664         if (info->count)
1665                 return -EBUSY;
1666
1667         if (cmd != SIOCWANDEV)
1668                 return hdlc_ioctl(dev, ifr, cmd);
1669
1670         switch(ifr->ifr_settings.type) {
1671         case IF_GET_IFACE: /* return current sync_serial_settings */
1672
1673                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1674                 if (ifr->ifr_settings.size < size) {
1675                         ifr->ifr_settings.size = size; /* data size wanted */
1676                         return -ENOBUFS;
1677                 }
1678
1679                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1680                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1681                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1682                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1683
1684                 switch (flags){
1685                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1686                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1687                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1688                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1689                 default: new_line.clock_type = CLOCK_DEFAULT;
1690                 }
1691
1692                 new_line.clock_rate = info->params.clock_speed;
1693                 new_line.loopback   = info->params.loopback ? 1:0;
1694
1695                 if (copy_to_user(line, &new_line, size))
1696                         return -EFAULT;
1697                 return 0;
1698
1699         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1700
1701                 if(!capable(CAP_NET_ADMIN))
1702                         return -EPERM;
1703                 if (copy_from_user(&new_line, line, size))
1704                         return -EFAULT;
1705
1706                 switch (new_line.clock_type)
1707                 {
1708                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1709                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1710                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1711                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1712                 case CLOCK_DEFAULT:  flags = info->params.flags &
1713                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1714                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1715                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1716                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1717                 default: return -EINVAL;
1718                 }
1719
1720                 if (new_line.loopback != 0 && new_line.loopback != 1)
1721                         return -EINVAL;
1722
1723                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1724                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1725                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1726                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1727                 info->params.flags |= flags;
1728
1729                 info->params.loopback = new_line.loopback;
1730
1731                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1732                         info->params.clock_speed = new_line.clock_rate;
1733                 else
1734                         info->params.clock_speed = 0;
1735
1736                 /* if network interface up, reprogram hardware */
1737                 if (info->netcount)
1738                         program_hw(info);
1739                 return 0;
1740
1741         default:
1742                 return hdlc_ioctl(dev, ifr, cmd);
1743         }
1744 }
1745
1746 /**
1747  * called by network layer when transmit timeout is detected
1748  *
1749  * dev  pointer to network device structure
1750  */
1751 static void hdlcdev_tx_timeout(struct net_device *dev)
1752 {
1753         struct slgt_info *info = dev_to_port(dev);
1754         struct net_device_stats *stats = hdlc_stats(dev);
1755         unsigned long flags;
1756
1757         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1758
1759         stats->tx_errors++;
1760         stats->tx_aborted_errors++;
1761
1762         spin_lock_irqsave(&info->lock,flags);
1763         tx_stop(info);
1764         spin_unlock_irqrestore(&info->lock,flags);
1765
1766         netif_wake_queue(dev);
1767 }
1768
1769 /**
1770  * called by device driver when transmit completes
1771  * reenable network layer transmit if stopped
1772  *
1773  * info  pointer to device instance information
1774  */
1775 static void hdlcdev_tx_done(struct slgt_info *info)
1776 {
1777         if (netif_queue_stopped(info->netdev))
1778                 netif_wake_queue(info->netdev);
1779 }
1780
1781 /**
1782  * called by device driver when frame received
1783  * pass frame to network layer
1784  *
1785  * info  pointer to device instance information
1786  * buf   pointer to buffer contianing frame data
1787  * size  count of data bytes in buf
1788  */
1789 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1790 {
1791         struct sk_buff *skb = dev_alloc_skb(size);
1792         struct net_device *dev = info->netdev;
1793         struct net_device_stats *stats = hdlc_stats(dev);
1794
1795         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1796
1797         if (skb == NULL) {
1798                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1799                 stats->rx_dropped++;
1800                 return;
1801         }
1802
1803         memcpy(skb_put(skb, size),buf,size);
1804
1805         skb->protocol = hdlc_type_trans(skb, info->netdev);
1806
1807         stats->rx_packets++;
1808         stats->rx_bytes += size;
1809
1810         netif_rx(skb);
1811
1812         info->netdev->last_rx = jiffies;
1813 }
1814
1815 /**
1816  * called by device driver when adding device instance
1817  * do generic HDLC initialization
1818  *
1819  * info  pointer to device instance information
1820  *
1821  * returns 0 if success, otherwise error code
1822  */
1823 static int hdlcdev_init(struct slgt_info *info)
1824 {
1825         int rc;
1826         struct net_device *dev;
1827         hdlc_device *hdlc;
1828
1829         /* allocate and initialize network and HDLC layer objects */
1830
1831         if (!(dev = alloc_hdlcdev(info))) {
1832                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1833                 return -ENOMEM;
1834         }
1835
1836         /* for network layer reporting purposes only */
1837         dev->mem_start = info->phys_reg_addr;
1838         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1839         dev->irq       = info->irq_level;
1840
1841         /* network layer callbacks and settings */
1842         dev->do_ioctl       = hdlcdev_ioctl;
1843         dev->open           = hdlcdev_open;
1844         dev->stop           = hdlcdev_close;
1845         dev->tx_timeout     = hdlcdev_tx_timeout;
1846         dev->watchdog_timeo = 10*HZ;
1847         dev->tx_queue_len   = 50;
1848
1849         /* generic HDLC layer callbacks and settings */
1850         hdlc         = dev_to_hdlc(dev);
1851         hdlc->attach = hdlcdev_attach;
1852         hdlc->xmit   = hdlcdev_xmit;
1853
1854         /* register objects with HDLC layer */
1855         if ((rc = register_hdlc_device(dev))) {
1856                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1857                 free_netdev(dev);
1858                 return rc;
1859         }
1860
1861         info->netdev = dev;
1862         return 0;
1863 }
1864
1865 /**
1866  * called by device driver when removing device instance
1867  * do generic HDLC cleanup
1868  *
1869  * info  pointer to device instance information
1870  */
1871 static void hdlcdev_exit(struct slgt_info *info)
1872 {
1873         unregister_hdlc_device(info->netdev);
1874         free_netdev(info->netdev);
1875         info->netdev = NULL;
1876 }
1877
1878 #endif /* ifdef CONFIG_HDLC */
1879
1880 /*
1881  * get async data from rx DMA buffers
1882  */
1883 static void rx_async(struct slgt_info *info)
1884 {
1885         struct tty_struct *tty = info->tty;
1886         struct mgsl_icount *icount = &info->icount;
1887         unsigned int start, end;
1888         unsigned char *p;
1889         unsigned char status;
1890         struct slgt_desc *bufs = info->rbufs;
1891         int i, count;
1892         int chars = 0;
1893         int stat;
1894         unsigned char ch;
1895
1896         start = end = info->rbuf_current;
1897
1898         while(desc_complete(bufs[end])) {
1899                 count = desc_count(bufs[end]) - info->rbuf_index;
1900                 p     = bufs[end].buf + info->rbuf_index;
1901
1902                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1903                 DBGDATA(info, p, count, "rx");
1904
1905                 for(i=0 ; i < count; i+=2, p+=2) {
1906                         ch = *p;
1907                         icount->rx++;
1908
1909                         stat = 0;
1910
1911                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1912                                 if (status & BIT1)
1913                                         icount->parity++;
1914                                 else if (status & BIT0)
1915                                         icount->frame++;
1916                                 /* discard char if tty control flags say so */
1917                                 if (status & info->ignore_status_mask)
1918                                         continue;
1919                                 if (status & BIT1)
1920                                         stat = TTY_PARITY;
1921                                 else if (status & BIT0)
1922                                         stat = TTY_FRAME;
1923                         }
1924                         if (tty) {
1925                                 tty_insert_flip_char(tty, ch, stat);
1926                                 chars++;
1927                         }
1928                 }
1929
1930                 if (i < count) {
1931                         /* receive buffer not completed */
1932                         info->rbuf_index += i;
1933                         mod_timer(&info->rx_timer, jiffies + 1);
1934                         break;
1935                 }
1936
1937                 info->rbuf_index = 0;
1938                 free_rbufs(info, end, end);
1939
1940                 if (++end == info->rbuf_count)
1941                         end = 0;
1942
1943                 /* if entire list searched then no frame available */
1944                 if (end == start)
1945                         break;
1946         }
1947
1948         if (tty && chars)
1949                 tty_flip_buffer_push(tty);
1950 }
1951
1952 /*
1953  * return next bottom half action to perform
1954  */
1955 static int bh_action(struct slgt_info *info)
1956 {
1957         unsigned long flags;
1958         int rc;
1959
1960         spin_lock_irqsave(&info->lock,flags);
1961
1962         if (info->pending_bh & BH_RECEIVE) {
1963                 info->pending_bh &= ~BH_RECEIVE;
1964                 rc = BH_RECEIVE;
1965         } else if (info->pending_bh & BH_TRANSMIT) {
1966                 info->pending_bh &= ~BH_TRANSMIT;
1967                 rc = BH_TRANSMIT;
1968         } else if (info->pending_bh & BH_STATUS) {
1969                 info->pending_bh &= ~BH_STATUS;
1970                 rc = BH_STATUS;
1971         } else {
1972                 /* Mark BH routine as complete */
1973                 info->bh_running   = 0;
1974                 info->bh_requested = 0;
1975                 rc = 0;
1976         }
1977
1978         spin_unlock_irqrestore(&info->lock,flags);
1979
1980         return rc;
1981 }
1982
1983 /*
1984  * perform bottom half processing
1985  */
1986 static void bh_handler(struct work_struct *work)
1987 {
1988         struct slgt_info *info = container_of(work, struct slgt_info, task);
1989         int action;
1990
1991         if (!info)
1992                 return;
1993         info->bh_running = 1;
1994
1995         while((action = bh_action(info))) {
1996                 switch (action) {
1997                 case BH_RECEIVE:
1998                         DBGBH(("%s bh receive\n", info->device_name));
1999                         switch(info->params.mode) {
2000                         case MGSL_MODE_ASYNC:
2001                                 rx_async(info);
2002                                 break;
2003                         case MGSL_MODE_HDLC:
2004                                 while(rx_get_frame(info));
2005                                 break;
2006                         case MGSL_MODE_RAW:
2007                         case MGSL_MODE_MONOSYNC:
2008                         case MGSL_MODE_BISYNC:
2009                                 while(rx_get_buf(info));
2010                                 break;
2011                         }
2012                         /* restart receiver if rx DMA buffers exhausted */
2013                         if (info->rx_restart)
2014                                 rx_start(info);
2015                         break;
2016                 case BH_TRANSMIT:
2017                         bh_transmit(info);
2018                         break;
2019                 case BH_STATUS:
2020                         DBGBH(("%s bh status\n", info->device_name));
2021                         info->ri_chkcount = 0;
2022                         info->dsr_chkcount = 0;
2023                         info->dcd_chkcount = 0;
2024                         info->cts_chkcount = 0;
2025                         break;
2026                 default:
2027                         DBGBH(("%s unknown action\n", info->device_name));
2028                         break;
2029                 }
2030         }
2031         DBGBH(("%s bh_handler exit\n", info->device_name));
2032 }
2033
2034 static void bh_transmit(struct slgt_info *info)
2035 {
2036         struct tty_struct *tty = info->tty;
2037
2038         DBGBH(("%s bh_transmit\n", info->device_name));
2039         if (tty)
2040                 tty_wakeup(tty);
2041 }
2042
2043 static void dsr_change(struct slgt_info *info)
2044 {
2045         get_signals(info);
2046         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2047         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2048                 slgt_irq_off(info, IRQ_DSR);
2049                 return;
2050         }
2051         info->icount.dsr++;
2052         if (info->signals & SerialSignal_DSR)
2053                 info->input_signal_events.dsr_up++;
2054         else
2055                 info->input_signal_events.dsr_down++;
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)
2062 {
2063         get_signals(info);
2064         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2065         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2066                 slgt_irq_off(info, IRQ_CTS);
2067                 return;
2068         }
2069         info->icount.cts++;
2070         if (info->signals & SerialSignal_CTS)
2071                 info->input_signal_events.cts_up++;
2072         else
2073                 info->input_signal_events.cts_down++;
2074         wake_up_interruptible(&info->status_event_wait_q);
2075         wake_up_interruptible(&info->event_wait_q);
2076         info->pending_bh |= BH_STATUS;
2077
2078         if (info->flags & ASYNC_CTS_FLOW) {
2079                 if (info->tty) {
2080                         if (info->tty->hw_stopped) {
2081                                 if (info->signals & SerialSignal_CTS) {
2082                                         info->tty->hw_stopped = 0;
2083                                         info->pending_bh |= BH_TRANSMIT;
2084                                         return;
2085                                 }
2086                         } else {
2087                                 if (!(info->signals & SerialSignal_CTS))
2088                                         info->tty->hw_stopped = 1;
2089                         }
2090                 }
2091         }
2092 }
2093
2094 static void dcd_change(struct slgt_info *info)
2095 {
2096         get_signals(info);
2097         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2098         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2099                 slgt_irq_off(info, IRQ_DCD);
2100                 return;
2101         }
2102         info->icount.dcd++;
2103         if (info->signals & SerialSignal_DCD) {
2104                 info->input_signal_events.dcd_up++;
2105         } else {
2106                 info->input_signal_events.dcd_down++;
2107         }
2108 #if SYNCLINK_GENERIC_HDLC
2109         if (info->netcount) {
2110                 if (info->signals & SerialSignal_DCD)
2111                         netif_carrier_on(info->netdev);
2112                 else
2113                         netif_carrier_off(info->netdev);
2114         }
2115 #endif
2116         wake_up_interruptible(&info->status_event_wait_q);
2117         wake_up_interruptible(&info->event_wait_q);
2118         info->pending_bh |= BH_STATUS;
2119
2120         if (info->flags & ASYNC_CHECK_CD) {
2121                 if (info->signals & SerialSignal_DCD)
2122                         wake_up_interruptible(&info->open_wait);
2123                 else {
2124                         if (info->tty)
2125                                 tty_hangup(info->tty);
2126                 }
2127         }
2128 }
2129
2130 static void ri_change(struct slgt_info *info)
2131 {
2132         get_signals(info);
2133         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2134         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2135                 slgt_irq_off(info, IRQ_RI);
2136                 return;
2137         }
2138         info->icount.dcd++;
2139         if (info->signals & SerialSignal_RI) {
2140                 info->input_signal_events.ri_up++;
2141         } else {
2142                 info->input_signal_events.ri_down++;
2143         }
2144         wake_up_interruptible(&info->status_event_wait_q);
2145         wake_up_interruptible(&info->event_wait_q);
2146         info->pending_bh |= BH_STATUS;
2147 }
2148
2149 static void isr_serial(struct slgt_info *info)
2150 {
2151         unsigned short status = rd_reg16(info, SSR);
2152
2153         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2154
2155         wr_reg16(info, SSR, status); /* clear pending */
2156
2157         info->irq_occurred = 1;
2158
2159         if (info->params.mode == MGSL_MODE_ASYNC) {
2160                 if (status & IRQ_TXIDLE) {
2161                         if (info->tx_count)
2162                                 isr_txeom(info, status);
2163                 }
2164                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2165                         info->icount.brk++;
2166                         /* process break detection if tty control allows */
2167                         if (info->tty) {
2168                                 if (!(status & info->ignore_status_mask)) {
2169                                         if (info->read_status_mask & MASK_BREAK) {
2170                                                 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
2171                                                 if (info->flags & ASYNC_SAK)
2172                                                         do_SAK(info->tty);
2173                                         }
2174                                 }
2175                         }
2176                 }
2177         } else {
2178                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2179                         isr_txeom(info, status);
2180
2181                 if (status & IRQ_RXIDLE) {
2182                         if (status & RXIDLE)
2183                                 info->icount.rxidle++;
2184                         else
2185                                 info->icount.exithunt++;
2186                         wake_up_interruptible(&info->event_wait_q);
2187                 }
2188
2189                 if (status & IRQ_RXOVER)
2190                         rx_start(info);
2191         }
2192
2193         if (status & IRQ_DSR)
2194                 dsr_change(info);
2195         if (status & IRQ_CTS)
2196                 cts_change(info);
2197         if (status & IRQ_DCD)
2198                 dcd_change(info);
2199         if (status & IRQ_RI)
2200                 ri_change(info);
2201 }
2202
2203 static void isr_rdma(struct slgt_info *info)
2204 {
2205         unsigned int status = rd_reg32(info, RDCSR);
2206
2207         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2208
2209         /* RDCSR (rx DMA control/status)
2210          *
2211          * 31..07  reserved
2212          * 06      save status byte to DMA buffer
2213          * 05      error
2214          * 04      eol (end of list)
2215          * 03      eob (end of buffer)
2216          * 02      IRQ enable
2217          * 01      reset
2218          * 00      enable
2219          */
2220         wr_reg32(info, RDCSR, status);  /* clear pending */
2221
2222         if (status & (BIT5 + BIT4)) {
2223                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2224                 info->rx_restart = 1;
2225         }
2226         info->pending_bh |= BH_RECEIVE;
2227 }
2228
2229 static void isr_tdma(struct slgt_info *info)
2230 {
2231         unsigned int status = rd_reg32(info, TDCSR);
2232
2233         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2234
2235         /* TDCSR (tx DMA control/status)
2236          *
2237          * 31..06  reserved
2238          * 05      error
2239          * 04      eol (end of list)
2240          * 03      eob (end of buffer)
2241          * 02      IRQ enable
2242          * 01      reset
2243          * 00      enable
2244          */
2245         wr_reg32(info, TDCSR, status);  /* clear pending */
2246
2247         if (status & (BIT5 + BIT4 + BIT3)) {
2248                 // another transmit buffer has completed
2249                 // run bottom half to get more send data from user
2250                 info->pending_bh |= BH_TRANSMIT;
2251         }
2252 }
2253
2254 static void isr_txeom(struct slgt_info *info, unsigned short status)
2255 {
2256         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2257
2258         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2259         tdma_reset(info);
2260         reset_tbufs(info);
2261         if (status & IRQ_TXUNDER) {
2262                 unsigned short val = rd_reg16(info, TCR);
2263                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2264                 wr_reg16(info, TCR, val); /* clear reset bit */
2265         }
2266
2267         if (info->tx_active) {
2268                 if (info->params.mode != MGSL_MODE_ASYNC) {
2269                         if (status & IRQ_TXUNDER)
2270                                 info->icount.txunder++;
2271                         else if (status & IRQ_TXIDLE)
2272                                 info->icount.txok++;
2273                 }
2274
2275                 info->tx_active = 0;
2276                 info->tx_count = 0;
2277
2278                 del_timer(&info->tx_timer);
2279
2280                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2281                         info->signals &= ~SerialSignal_RTS;
2282                         info->drop_rts_on_tx_done = 0;
2283                         set_signals(info);
2284                 }
2285
2286 #if SYNCLINK_GENERIC_HDLC
2287                 if (info->netcount)
2288                         hdlcdev_tx_done(info);
2289                 else
2290 #endif
2291                 {
2292                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2293                                 tx_stop(info);
2294                                 return;
2295                         }
2296                         info->pending_bh |= BH_TRANSMIT;
2297                 }
2298         }
2299 }
2300
2301 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2302 {
2303         struct cond_wait *w, *prev;
2304
2305         /* wake processes waiting for specific transitions */
2306         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2307                 if (w->data & changed) {
2308                         w->data = state;
2309                         wake_up_interruptible(&w->q);
2310                         if (prev != NULL)
2311                                 prev->next = w->next;
2312                         else
2313                                 info->gpio_wait_q = w->next;
2314                 } else
2315                         prev = w;
2316         }
2317 }
2318
2319 /* interrupt service routine
2320  *
2321  *      irq     interrupt number
2322  *      dev_id  device ID supplied during interrupt registration
2323  */
2324 static irqreturn_t slgt_interrupt(int irq, void *dev_id)
2325 {
2326         struct slgt_info *info;
2327         unsigned int gsr;
2328         unsigned int i;
2329
2330         DBGISR(("slgt_interrupt irq=%d entry\n", irq));
2331
2332         info = dev_id;
2333         if (!info)
2334                 return IRQ_NONE;
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", irq));
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