WAN: remove extra help text from HDLC_PPP config option
[linux-2.6.git] / drivers / char / synclink_gt.c
1 /*
2  * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
3  *
4  * Device driver for Microgate SyncLink GT serial adapters.
5  *
6  * written by Paul Fulghum for Microgate Corporation
7  * paulkf@microgate.com
8  *
9  * Microgate and SyncLink are trademarks of Microgate Corporation
10  *
11  * This code is released under the GNU General Public License (GPL)
12  *
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23  * OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 /*
27  * DEBUG OUTPUT DEFINITIONS
28  *
29  * uncomment lines below to enable specific types of debug output
30  *
31  * DBGINFO   information - most verbose output
32  * DBGERR    serious errors
33  * DBGBH     bottom half service routine debugging
34  * DBGISR    interrupt service routine debugging
35  * DBGDATA   output receive and transmit data
36  * DBGTBUF   output transmit DMA buffers and registers
37  * DBGRBUF   output receive DMA buffers and registers
38  */
39
40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45 //#define DBGTBUF(info) dump_tbufs(info)
46 //#define DBGRBUF(info) dump_rbufs(info)
47
48
49 #include <linux/module.h>
50 #include <linux/version.h>
51 #include <linux/errno.h>
52 #include <linux/signal.h>
53 #include <linux/sched.h>
54 #include <linux/timer.h>
55 #include <linux/interrupt.h>
56 #include <linux/pci.h>
57 #include <linux/tty.h>
58 #include <linux/tty_flip.h>
59 #include <linux/serial.h>
60 #include <linux/major.h>
61 #include <linux/string.h>
62 #include <linux/fcntl.h>
63 #include <linux/ptrace.h>
64 #include <linux/ioport.h>
65 #include <linux/mm.h>
66 #include <linux/slab.h>
67 #include <linux/netdevice.h>
68 #include <linux/vmalloc.h>
69 #include <linux/init.h>
70 #include <linux/delay.h>
71 #include <linux/ioctl.h>
72 #include <linux/termios.h>
73 #include <linux/bitops.h>
74 #include <linux/workqueue.h>
75 #include <linux/hdlc.h>
76 #include <linux/synclink.h>
77
78 #include <asm/system.h>
79 #include <asm/io.h>
80 #include <asm/irq.h>
81 #include <asm/dma.h>
82 #include <asm/types.h>
83 #include <asm/uaccess.h>
84
85 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
86 #define SYNCLINK_GENERIC_HDLC 1
87 #else
88 #define SYNCLINK_GENERIC_HDLC 0
89 #endif
90
91 /*
92  * module identification
93  */
94 static char *driver_name     = "SyncLink GT";
95 static char *driver_version  = "$Revision: 4.50 $";
96 static char *tty_driver_name = "synclink_gt";
97 static char *tty_dev_prefix  = "ttySLG";
98 MODULE_LICENSE("GPL");
99 #define MGSL_MAGIC 0x5401
100 #define MAX_DEVICES 32
101
102 static struct pci_device_id pci_table[] = {
103         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107         {0,}, /* terminate list */
108 };
109 MODULE_DEVICE_TABLE(pci, pci_table);
110
111 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
112 static void remove_one(struct pci_dev *dev);
113 static struct pci_driver pci_driver = {
114         .name           = "synclink_gt",
115         .id_table       = pci_table,
116         .probe          = init_one,
117         .remove         = __devexit_p(remove_one),
118 };
119
120 static bool pci_registered;
121
122 /*
123  * module configuration and status
124  */
125 static struct slgt_info *slgt_device_list;
126 static int slgt_device_count;
127
128 static int ttymajor;
129 static int debug_level;
130 static int maxframe[MAX_DEVICES];
131 static int dosyncppp[MAX_DEVICES];
132
133 module_param(ttymajor, int, 0);
134 module_param(debug_level, int, 0);
135 module_param_array(maxframe, int, NULL, 0);
136 module_param_array(dosyncppp, int, NULL, 0);
137
138 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
139 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
140 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
141 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
142
143 /*
144  * tty support and callbacks
145  */
146 static struct tty_driver *serial_driver;
147
148 static int  open(struct tty_struct *tty, struct file * filp);
149 static void close(struct tty_struct *tty, struct file * filp);
150 static void hangup(struct tty_struct *tty);
151 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
152
153 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
154 static int put_char(struct tty_struct *tty, unsigned char ch);
155 static void send_xchar(struct tty_struct *tty, char ch);
156 static void wait_until_sent(struct tty_struct *tty, int timeout);
157 static int  write_room(struct tty_struct *tty);
158 static void flush_chars(struct tty_struct *tty);
159 static void flush_buffer(struct tty_struct *tty);
160 static void tx_hold(struct tty_struct *tty);
161 static void tx_release(struct tty_struct *tty);
162
163 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
164 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
165 static int  chars_in_buffer(struct tty_struct *tty);
166 static void throttle(struct tty_struct * tty);
167 static void unthrottle(struct tty_struct * tty);
168 static int set_break(struct tty_struct *tty, int break_state);
169
170 /*
171  * generic HDLC support and callbacks
172  */
173 #if SYNCLINK_GENERIC_HDLC
174 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
175 static void hdlcdev_tx_done(struct slgt_info *info);
176 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
177 static int  hdlcdev_init(struct slgt_info *info);
178 static void hdlcdev_exit(struct slgt_info *info);
179 #endif
180
181
182 /*
183  * device specific structures, macros and functions
184  */
185
186 #define SLGT_MAX_PORTS 4
187 #define SLGT_REG_SIZE  256
188
189 /*
190  * conditional wait facility
191  */
192 struct cond_wait {
193         struct cond_wait *next;
194         wait_queue_head_t q;
195         wait_queue_t wait;
196         unsigned int data;
197 };
198 static void init_cond_wait(struct cond_wait *w, unsigned int data);
199 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
200 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
201 static void flush_cond_wait(struct cond_wait **head);
202
203 /*
204  * DMA buffer descriptor and access macros
205  */
206 struct slgt_desc
207 {
208         __le16 count;
209         __le16 status;
210         __le32 pbuf;  /* physical address of data buffer */
211         __le32 next;  /* physical address of next descriptor */
212
213         /* driver book keeping */
214         char *buf;          /* virtual  address of data buffer */
215         unsigned int pdesc; /* physical address of this descriptor */
216         dma_addr_t buf_dma_addr;
217         unsigned short buf_count;
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         struct tty_port port;
249
250         struct slgt_info *next_device;  /* device list link */
251
252         int magic;
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                     line;           /* tty line instance number */
265
266         struct mgsl_icount      icount;
267
268         int                     timeout;
269         int                     x_char;         /* xon/xoff character */
270         unsigned int            read_status_mask;
271         unsigned int            ignore_status_mask;
272
273         wait_queue_head_t       status_event_wait_q;
274         wait_queue_head_t       event_wait_q;
275         struct timer_list       tx_timer;
276         struct timer_list       rx_timer;
277
278         unsigned int            gpio_present;
279         struct cond_wait        *gpio_wait_q;
280
281         spinlock_t lock;        /* spinlock for synchronizing with ISR */
282
283         struct work_struct task;
284         u32 pending_bh;
285         bool bh_requested;
286         bool bh_running;
287
288         int isr_overflow;
289         bool irq_requested;     /* true if IRQ requested */
290         bool irq_occurred;      /* for diagnostics use */
291
292         /* device configuration */
293
294         unsigned int bus_type;
295         unsigned int irq_level;
296         unsigned long irq_flags;
297
298         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
299         u32 phys_reg_addr;
300         bool reg_addr_requested;
301
302         MGSL_PARAMS params;       /* communications parameters */
303         u32 idle_mode;
304         u32 max_frame_size;       /* as set by device config */
305
306         unsigned int rbuf_fill_level;
307         unsigned int if_mode;
308
309         /* device status */
310
311         bool rx_enabled;
312         bool rx_restart;
313
314         bool tx_enabled;
315         bool tx_active;
316
317         unsigned char signals;    /* serial signal states */
318         int init_error;  /* initialization error */
319
320         unsigned char *tx_buf;
321         int tx_count;
322
323         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
324         char char_buf[MAX_ASYNC_BUFFER_SIZE];
325         bool drop_rts_on_tx_done;
326         struct  _input_signal_events    input_signal_events;
327
328         int dcd_chkcount;       /* check counts to prevent */
329         int cts_chkcount;       /* too many IRQs if a signal */
330         int dsr_chkcount;       /* is floating */
331         int ri_chkcount;
332
333         char *bufs;             /* virtual address of DMA buffer lists */
334         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
335
336         unsigned int rbuf_count;
337         struct slgt_desc *rbufs;
338         unsigned int rbuf_current;
339         unsigned int rbuf_index;
340
341         unsigned int tbuf_count;
342         struct slgt_desc *tbufs;
343         unsigned int tbuf_current;
344         unsigned int tbuf_start;
345
346         unsigned char *tmp_rbuf;
347         unsigned int tmp_rbuf_count;
348
349         /* SPPP/Cisco HDLC device parts */
350
351         int netcount;
352         int dosyncppp;
353         spinlock_t netlock;
354 #if SYNCLINK_GENERIC_HDLC
355         struct net_device *netdev;
356 #endif
357
358 };
359
360 static MGSL_PARAMS default_params = {
361         .mode            = MGSL_MODE_HDLC,
362         .loopback        = 0,
363         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
364         .encoding        = HDLC_ENCODING_NRZI_SPACE,
365         .clock_speed     = 0,
366         .addr_filter     = 0xff,
367         .crc_type        = HDLC_CRC_16_CCITT,
368         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
369         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
370         .data_rate       = 9600,
371         .data_bits       = 8,
372         .stop_bits       = 1,
373         .parity          = ASYNC_PARITY_NONE
374 };
375
376
377 #define BH_RECEIVE  1
378 #define BH_TRANSMIT 2
379 #define BH_STATUS   4
380 #define IO_PIN_SHUTDOWN_LIMIT 100
381
382 #define DMABUFSIZE 256
383 #define DESC_LIST_SIZE 4096
384
385 #define MASK_PARITY  BIT1
386 #define MASK_FRAMING BIT0
387 #define MASK_BREAK   BIT14
388 #define MASK_OVERRUN BIT4
389
390 #define GSR   0x00 /* global status */
391 #define JCR   0x04 /* JTAG control */
392 #define IODR  0x08 /* GPIO direction */
393 #define IOER  0x0c /* GPIO interrupt enable */
394 #define IOVR  0x10 /* GPIO value */
395 #define IOSR  0x14 /* GPIO interrupt status */
396 #define TDR   0x80 /* tx data */
397 #define RDR   0x80 /* rx data */
398 #define TCR   0x82 /* tx control */
399 #define TIR   0x84 /* tx idle */
400 #define TPR   0x85 /* tx preamble */
401 #define RCR   0x86 /* rx control */
402 #define VCR   0x88 /* V.24 control */
403 #define CCR   0x89 /* clock control */
404 #define BDR   0x8a /* baud divisor */
405 #define SCR   0x8c /* serial control */
406 #define SSR   0x8e /* serial status */
407 #define RDCSR 0x90 /* rx DMA control/status */
408 #define TDCSR 0x94 /* tx DMA control/status */
409 #define RDDAR 0x98 /* rx DMA descriptor address */
410 #define TDDAR 0x9c /* tx DMA descriptor address */
411
412 #define RXIDLE      BIT14
413 #define RXBREAK     BIT14
414 #define IRQ_TXDATA  BIT13
415 #define IRQ_TXIDLE  BIT12
416 #define IRQ_TXUNDER BIT11 /* HDLC */
417 #define IRQ_RXDATA  BIT10
418 #define IRQ_RXIDLE  BIT9  /* HDLC */
419 #define IRQ_RXBREAK BIT9  /* async */
420 #define IRQ_RXOVER  BIT8
421 #define IRQ_DSR     BIT7
422 #define IRQ_CTS     BIT6
423 #define IRQ_DCD     BIT5
424 #define IRQ_RI      BIT4
425 #define IRQ_ALL     0x3ff0
426 #define IRQ_MASTER  BIT0
427
428 #define slgt_irq_on(info, mask) \
429         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
430 #define slgt_irq_off(info, mask) \
431         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
432
433 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
434 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
435 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
436 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
437 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
438 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
439
440 static void  msc_set_vcr(struct slgt_info *info);
441
442 static int  startup(struct slgt_info *info);
443 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
444 static void shutdown(struct slgt_info *info);
445 static void program_hw(struct slgt_info *info);
446 static void change_params(struct slgt_info *info);
447
448 static int  register_test(struct slgt_info *info);
449 static int  irq_test(struct slgt_info *info);
450 static int  loopback_test(struct slgt_info *info);
451 static int  adapter_test(struct slgt_info *info);
452
453 static void reset_adapter(struct slgt_info *info);
454 static void reset_port(struct slgt_info *info);
455 static void async_mode(struct slgt_info *info);
456 static void sync_mode(struct slgt_info *info);
457
458 static void rx_stop(struct slgt_info *info);
459 static void rx_start(struct slgt_info *info);
460 static void reset_rbufs(struct slgt_info *info);
461 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
462 static void rdma_reset(struct slgt_info *info);
463 static bool rx_get_frame(struct slgt_info *info);
464 static bool rx_get_buf(struct slgt_info *info);
465
466 static void tx_start(struct slgt_info *info);
467 static void tx_stop(struct slgt_info *info);
468 static void tx_set_idle(struct slgt_info *info);
469 static unsigned int free_tbuf_count(struct slgt_info *info);
470 static unsigned int tbuf_bytes(struct slgt_info *info);
471 static void reset_tbufs(struct slgt_info *info);
472 static void tdma_reset(struct slgt_info *info);
473 static void tdma_start(struct slgt_info *info);
474 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
475
476 static void get_signals(struct slgt_info *info);
477 static void set_signals(struct slgt_info *info);
478 static void enable_loopback(struct slgt_info *info);
479 static void set_rate(struct slgt_info *info, u32 data_rate);
480
481 static int  bh_action(struct slgt_info *info);
482 static void bh_handler(struct work_struct *work);
483 static void bh_transmit(struct slgt_info *info);
484 static void isr_serial(struct slgt_info *info);
485 static void isr_rdma(struct slgt_info *info);
486 static void isr_txeom(struct slgt_info *info, unsigned short status);
487 static void isr_tdma(struct slgt_info *info);
488
489 static int  alloc_dma_bufs(struct slgt_info *info);
490 static void free_dma_bufs(struct slgt_info *info);
491 static int  alloc_desc(struct slgt_info *info);
492 static void free_desc(struct slgt_info *info);
493 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
494 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
495
496 static int  alloc_tmp_rbuf(struct slgt_info *info);
497 static void free_tmp_rbuf(struct slgt_info *info);
498
499 static void tx_timeout(unsigned long context);
500 static void rx_timeout(unsigned long context);
501
502 /*
503  * ioctl handlers
504  */
505 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
506 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
507 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
508 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
509 static int  set_txidle(struct slgt_info *info, int idle_mode);
510 static int  tx_enable(struct slgt_info *info, int enable);
511 static int  tx_abort(struct slgt_info *info);
512 static int  rx_enable(struct slgt_info *info, int enable);
513 static int  modem_input_wait(struct slgt_info *info,int arg);
514 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
515 static int  tiocmget(struct tty_struct *tty, struct file *file);
516 static int  tiocmset(struct tty_struct *tty, struct file *file,
517                      unsigned int set, unsigned int clear);
518 static int set_break(struct tty_struct *tty, int break_state);
519 static int  get_interface(struct slgt_info *info, int __user *if_mode);
520 static int  set_interface(struct slgt_info *info, int if_mode);
521 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
523 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
524
525 /*
526  * driver functions
527  */
528 static void add_device(struct slgt_info *info);
529 static void device_init(int adapter_num, struct pci_dev *pdev);
530 static int  claim_resources(struct slgt_info *info);
531 static void release_resources(struct slgt_info *info);
532
533 /*
534  * DEBUG OUTPUT CODE
535  */
536 #ifndef DBGINFO
537 #define DBGINFO(fmt)
538 #endif
539 #ifndef DBGERR
540 #define DBGERR(fmt)
541 #endif
542 #ifndef DBGBH
543 #define DBGBH(fmt)
544 #endif
545 #ifndef DBGISR
546 #define DBGISR(fmt)
547 #endif
548
549 #ifdef DBGDATA
550 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
551 {
552         int i;
553         int linecount;
554         printk("%s %s data:\n",info->device_name, label);
555         while(count) {
556                 linecount = (count > 16) ? 16 : count;
557                 for(i=0; i < linecount; i++)
558                         printk("%02X ",(unsigned char)data[i]);
559                 for(;i<17;i++)
560                         printk("   ");
561                 for(i=0;i<linecount;i++) {
562                         if (data[i]>=040 && data[i]<=0176)
563                                 printk("%c",data[i]);
564                         else
565                                 printk(".");
566                 }
567                 printk("\n");
568                 data  += linecount;
569                 count -= linecount;
570         }
571 }
572 #else
573 #define DBGDATA(info, buf, size, label)
574 #endif
575
576 #ifdef DBGTBUF
577 static void dump_tbufs(struct slgt_info *info)
578 {
579         int i;
580         printk("tbuf_current=%d\n", info->tbuf_current);
581         for (i=0 ; i < info->tbuf_count ; i++) {
582                 printk("%d: count=%04X status=%04X\n",
583                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
584         }
585 }
586 #else
587 #define DBGTBUF(info)
588 #endif
589
590 #ifdef DBGRBUF
591 static void dump_rbufs(struct slgt_info *info)
592 {
593         int i;
594         printk("rbuf_current=%d\n", info->rbuf_current);
595         for (i=0 ; i < info->rbuf_count ; i++) {
596                 printk("%d: count=%04X status=%04X\n",
597                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
598         }
599 }
600 #else
601 #define DBGRBUF(info)
602 #endif
603
604 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
605 {
606 #ifdef SANITY_CHECK
607         if (!info) {
608                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
609                 return 1;
610         }
611         if (info->magic != MGSL_MAGIC) {
612                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
613                 return 1;
614         }
615 #else
616         if (!info)
617                 return 1;
618 #endif
619         return 0;
620 }
621
622 /**
623  * line discipline callback wrappers
624  *
625  * The wrappers maintain line discipline references
626  * while calling into the line discipline.
627  *
628  * ldisc_receive_buf  - pass receive data to line discipline
629  */
630 static void ldisc_receive_buf(struct tty_struct *tty,
631                               const __u8 *data, char *flags, int count)
632 {
633         struct tty_ldisc *ld;
634         if (!tty)
635                 return;
636         ld = tty_ldisc_ref(tty);
637         if (ld) {
638                 if (ld->ops->receive_buf)
639                         ld->ops->receive_buf(tty, data, flags, count);
640                 tty_ldisc_deref(ld);
641         }
642 }
643
644 /* tty callbacks */
645
646 static int open(struct tty_struct *tty, struct file *filp)
647 {
648         struct slgt_info *info;
649         int retval, line;
650         unsigned long flags;
651
652         line = tty->index;
653         if ((line < 0) || (line >= slgt_device_count)) {
654                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
655                 return -ENODEV;
656         }
657
658         info = slgt_device_list;
659         while(info && info->line != line)
660                 info = info->next_device;
661         if (sanity_check(info, tty->name, "open"))
662                 return -ENODEV;
663         if (info->init_error) {
664                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
665                 return -ENODEV;
666         }
667
668         tty->driver_data = info;
669         info->port.tty = tty;
670
671         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
672
673         /* If port is closing, signal caller to try again */
674         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
675                 if (info->port.flags & ASYNC_CLOSING)
676                         interruptible_sleep_on(&info->port.close_wait);
677                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
678                         -EAGAIN : -ERESTARTSYS);
679                 goto cleanup;
680         }
681
682         info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
683
684         spin_lock_irqsave(&info->netlock, flags);
685         if (info->netcount) {
686                 retval = -EBUSY;
687                 spin_unlock_irqrestore(&info->netlock, flags);
688                 goto cleanup;
689         }
690         info->port.count++;
691         spin_unlock_irqrestore(&info->netlock, flags);
692
693         if (info->port.count == 1) {
694                 /* 1st open on this device, init hardware */
695                 retval = startup(info);
696                 if (retval < 0)
697                         goto cleanup;
698         }
699
700         retval = block_til_ready(tty, filp, info);
701         if (retval) {
702                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
703                 goto cleanup;
704         }
705
706         retval = 0;
707
708 cleanup:
709         if (retval) {
710                 if (tty->count == 1)
711                         info->port.tty = NULL; /* tty layer will release tty struct */
712                 if(info->port.count)
713                         info->port.count--;
714         }
715
716         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
717         return retval;
718 }
719
720 static void close(struct tty_struct *tty, struct file *filp)
721 {
722         struct slgt_info *info = tty->driver_data;
723
724         if (sanity_check(info, tty->name, "close"))
725                 return;
726         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
727
728         if (!info->port.count)
729                 return;
730
731         if (tty_hung_up_p(filp))
732                 goto cleanup;
733
734         if ((tty->count == 1) && (info->port.count != 1)) {
735                 /*
736                  * tty->count is 1 and the tty structure will be freed.
737                  * info->port.count should be one in this case.
738                  * if it's not, correct it so that the port is shutdown.
739                  */
740                 DBGERR(("%s close: bad refcount; tty->count=1, "
741                        "info->port.count=%d\n", info->device_name, info->port.count));
742                 info->port.count = 1;
743         }
744
745         info->port.count--;
746
747         /* if at least one open remaining, leave hardware active */
748         if (info->port.count)
749                 goto cleanup;
750
751         info->port.flags |= ASYNC_CLOSING;
752
753         /* set tty->closing to notify line discipline to
754          * only process XON/XOFF characters. Only the N_TTY
755          * discipline appears to use this (ppp does not).
756          */
757         tty->closing = 1;
758
759         /* wait for transmit data to clear all layers */
760
761         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
762                 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
763                 tty_wait_until_sent(tty, info->port.closing_wait);
764         }
765
766         if (info->port.flags & ASYNC_INITIALIZED)
767                 wait_until_sent(tty, info->timeout);
768         flush_buffer(tty);
769         tty_ldisc_flush(tty);
770
771         shutdown(info);
772
773         tty->closing = 0;
774         info->port.tty = NULL;
775
776         if (info->port.blocked_open) {
777                 if (info->port.close_delay) {
778                         msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
779                 }
780                 wake_up_interruptible(&info->port.open_wait);
781         }
782
783         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
784
785         wake_up_interruptible(&info->port.close_wait);
786
787 cleanup:
788         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
789 }
790
791 static void hangup(struct tty_struct *tty)
792 {
793         struct slgt_info *info = tty->driver_data;
794
795         if (sanity_check(info, tty->name, "hangup"))
796                 return;
797         DBGINFO(("%s hangup\n", info->device_name));
798
799         flush_buffer(tty);
800         shutdown(info);
801
802         info->port.count = 0;
803         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
804         info->port.tty = NULL;
805
806         wake_up_interruptible(&info->port.open_wait);
807 }
808
809 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
810 {
811         struct slgt_info *info = tty->driver_data;
812         unsigned long flags;
813
814         DBGINFO(("%s set_termios\n", tty->driver->name));
815
816         change_params(info);
817
818         /* Handle transition to B0 status */
819         if (old_termios->c_cflag & CBAUD &&
820             !(tty->termios->c_cflag & CBAUD)) {
821                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
822                 spin_lock_irqsave(&info->lock,flags);
823                 set_signals(info);
824                 spin_unlock_irqrestore(&info->lock,flags);
825         }
826
827         /* Handle transition away from B0 status */
828         if (!(old_termios->c_cflag & CBAUD) &&
829             tty->termios->c_cflag & CBAUD) {
830                 info->signals |= SerialSignal_DTR;
831                 if (!(tty->termios->c_cflag & CRTSCTS) ||
832                     !test_bit(TTY_THROTTLED, &tty->flags)) {
833                         info->signals |= SerialSignal_RTS;
834                 }
835                 spin_lock_irqsave(&info->lock,flags);
836                 set_signals(info);
837                 spin_unlock_irqrestore(&info->lock,flags);
838         }
839
840         /* Handle turning off CRTSCTS */
841         if (old_termios->c_cflag & CRTSCTS &&
842             !(tty->termios->c_cflag & CRTSCTS)) {
843                 tty->hw_stopped = 0;
844                 tx_release(tty);
845         }
846 }
847
848 static int write(struct tty_struct *tty,
849                  const unsigned char *buf, int count)
850 {
851         int ret = 0;
852         struct slgt_info *info = tty->driver_data;
853         unsigned long flags;
854         unsigned int bufs_needed;
855
856         if (sanity_check(info, tty->name, "write"))
857                 goto cleanup;
858         DBGINFO(("%s write count=%d\n", info->device_name, count));
859
860         if (!info->tx_buf)
861                 goto cleanup;
862
863         if (count > info->max_frame_size) {
864                 ret = -EIO;
865                 goto cleanup;
866         }
867
868         if (!count)
869                 goto cleanup;
870
871         if (!info->tx_active && info->tx_count) {
872                 /* send accumulated data from send_char() */
873                 tx_load(info, info->tx_buf, info->tx_count);
874                 goto start;
875         }
876         bufs_needed = (count/DMABUFSIZE);
877         if (count % DMABUFSIZE)
878                 ++bufs_needed;
879         if (bufs_needed > free_tbuf_count(info))
880                 goto cleanup;
881
882         ret = info->tx_count = count;
883         tx_load(info, buf, count);
884         goto start;
885
886 start:
887         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
888                 spin_lock_irqsave(&info->lock,flags);
889                 if (!info->tx_active)
890                         tx_start(info);
891                 else
892                         tdma_start(info);
893                 spin_unlock_irqrestore(&info->lock,flags);
894         }
895
896 cleanup:
897         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
898         return ret;
899 }
900
901 static int put_char(struct tty_struct *tty, unsigned char ch)
902 {
903         struct slgt_info *info = tty->driver_data;
904         unsigned long flags;
905         int ret = 0;
906
907         if (sanity_check(info, tty->name, "put_char"))
908                 return 0;
909         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
910         if (!info->tx_buf)
911                 return 0;
912         spin_lock_irqsave(&info->lock,flags);
913         if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
914                 info->tx_buf[info->tx_count++] = ch;
915                 ret = 1;
916         }
917         spin_unlock_irqrestore(&info->lock,flags);
918         return ret;
919 }
920
921 static void send_xchar(struct tty_struct *tty, char ch)
922 {
923         struct slgt_info *info = tty->driver_data;
924         unsigned long flags;
925
926         if (sanity_check(info, tty->name, "send_xchar"))
927                 return;
928         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
929         info->x_char = ch;
930         if (ch) {
931                 spin_lock_irqsave(&info->lock,flags);
932                 if (!info->tx_enabled)
933                         tx_start(info);
934                 spin_unlock_irqrestore(&info->lock,flags);
935         }
936 }
937
938 static void wait_until_sent(struct tty_struct *tty, int timeout)
939 {
940         struct slgt_info *info = tty->driver_data;
941         unsigned long orig_jiffies, char_time;
942
943         if (!info )
944                 return;
945         if (sanity_check(info, tty->name, "wait_until_sent"))
946                 return;
947         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
948         if (!(info->port.flags & ASYNC_INITIALIZED))
949                 goto exit;
950
951         orig_jiffies = jiffies;
952
953         /* Set check interval to 1/5 of estimated time to
954          * send a character, and make it at least 1. The check
955          * interval should also be less than the timeout.
956          * Note: use tight timings here to satisfy the NIST-PCTS.
957          */
958
959         lock_kernel();
960
961         if (info->params.data_rate) {
962                 char_time = info->timeout/(32 * 5);
963                 if (!char_time)
964                         char_time++;
965         } else
966                 char_time = 1;
967
968         if (timeout)
969                 char_time = min_t(unsigned long, char_time, timeout);
970
971         while (info->tx_active) {
972                 msleep_interruptible(jiffies_to_msecs(char_time));
973                 if (signal_pending(current))
974                         break;
975                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
976                         break;
977         }
978         unlock_kernel();
979
980 exit:
981         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
982 }
983
984 static int write_room(struct tty_struct *tty)
985 {
986         struct slgt_info *info = tty->driver_data;
987         int ret;
988
989         if (sanity_check(info, tty->name, "write_room"))
990                 return 0;
991         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
992         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
993         return ret;
994 }
995
996 static void flush_chars(struct tty_struct *tty)
997 {
998         struct slgt_info *info = tty->driver_data;
999         unsigned long flags;
1000
1001         if (sanity_check(info, tty->name, "flush_chars"))
1002                 return;
1003         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1004
1005         if (info->tx_count <= 0 || tty->stopped ||
1006             tty->hw_stopped || !info->tx_buf)
1007                 return;
1008
1009         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1010
1011         spin_lock_irqsave(&info->lock,flags);
1012         if (!info->tx_active && info->tx_count) {
1013                 tx_load(info, info->tx_buf,info->tx_count);
1014                 tx_start(info);
1015         }
1016         spin_unlock_irqrestore(&info->lock,flags);
1017 }
1018
1019 static void flush_buffer(struct tty_struct *tty)
1020 {
1021         struct slgt_info *info = tty->driver_data;
1022         unsigned long flags;
1023
1024         if (sanity_check(info, tty->name, "flush_buffer"))
1025                 return;
1026         DBGINFO(("%s flush_buffer\n", info->device_name));
1027
1028         spin_lock_irqsave(&info->lock,flags);
1029         if (!info->tx_active)
1030                 info->tx_count = 0;
1031         spin_unlock_irqrestore(&info->lock,flags);
1032
1033         tty_wakeup(tty);
1034 }
1035
1036 /*
1037  * throttle (stop) transmitter
1038  */
1039 static void tx_hold(struct tty_struct *tty)
1040 {
1041         struct slgt_info *info = tty->driver_data;
1042         unsigned long flags;
1043
1044         if (sanity_check(info, tty->name, "tx_hold"))
1045                 return;
1046         DBGINFO(("%s tx_hold\n", info->device_name));
1047         spin_lock_irqsave(&info->lock,flags);
1048         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1049                 tx_stop(info);
1050         spin_unlock_irqrestore(&info->lock,flags);
1051 }
1052
1053 /*
1054  * release (start) transmitter
1055  */
1056 static void tx_release(struct tty_struct *tty)
1057 {
1058         struct slgt_info *info = tty->driver_data;
1059         unsigned long flags;
1060
1061         if (sanity_check(info, tty->name, "tx_release"))
1062                 return;
1063         DBGINFO(("%s tx_release\n", info->device_name));
1064         spin_lock_irqsave(&info->lock,flags);
1065         if (!info->tx_active && info->tx_count) {
1066                 tx_load(info, info->tx_buf, info->tx_count);
1067                 tx_start(info);
1068         }
1069         spin_unlock_irqrestore(&info->lock,flags);
1070 }
1071
1072 /*
1073  * Service an IOCTL request
1074  *
1075  * Arguments
1076  *
1077  *      tty     pointer to tty instance data
1078  *      file    pointer to associated file object for device
1079  *      cmd     IOCTL command code
1080  *      arg     command argument/context
1081  *
1082  * Return 0 if success, otherwise error code
1083  */
1084 static int ioctl(struct tty_struct *tty, struct file *file,
1085                  unsigned int cmd, unsigned long arg)
1086 {
1087         struct slgt_info *info = tty->driver_data;
1088         struct mgsl_icount cnow;        /* kernel counter temps */
1089         struct serial_icounter_struct __user *p_cuser;  /* user space */
1090         unsigned long flags;
1091         void __user *argp = (void __user *)arg;
1092         int ret;
1093
1094         if (sanity_check(info, tty->name, "ioctl"))
1095                 return -ENODEV;
1096         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1097
1098         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1099             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1100                 if (tty->flags & (1 << TTY_IO_ERROR))
1101                     return -EIO;
1102         }
1103
1104         lock_kernel();
1105
1106         switch (cmd) {
1107         case MGSL_IOCGPARAMS:
1108                 ret = get_params(info, argp);
1109                 break;
1110         case MGSL_IOCSPARAMS:
1111                 ret = set_params(info, argp);
1112                 break;
1113         case MGSL_IOCGTXIDLE:
1114                 ret = get_txidle(info, argp);
1115                 break;
1116         case MGSL_IOCSTXIDLE:
1117                 ret = set_txidle(info, (int)arg);
1118                 break;
1119         case MGSL_IOCTXENABLE:
1120                 ret = tx_enable(info, (int)arg);
1121                 break;
1122         case MGSL_IOCRXENABLE:
1123                 ret = rx_enable(info, (int)arg);
1124                 break;
1125         case MGSL_IOCTXABORT:
1126                 ret = tx_abort(info);
1127                 break;
1128         case MGSL_IOCGSTATS:
1129                 ret = get_stats(info, argp);
1130                 break;
1131         case MGSL_IOCWAITEVENT:
1132                 ret = wait_mgsl_event(info, argp);
1133                 break;
1134         case TIOCMIWAIT:
1135                 ret = modem_input_wait(info,(int)arg);
1136                 break;
1137         case MGSL_IOCGIF:
1138                 ret = get_interface(info, argp);
1139                 break;
1140         case MGSL_IOCSIF:
1141                 ret = set_interface(info,(int)arg);
1142                 break;
1143         case MGSL_IOCSGPIO:
1144                 ret = set_gpio(info, argp);
1145                 break;
1146         case MGSL_IOCGGPIO:
1147                 ret = get_gpio(info, argp);
1148                 break;
1149         case MGSL_IOCWAITGPIO:
1150                 ret = wait_gpio(info, argp);
1151                 break;
1152         case TIOCGICOUNT:
1153                 spin_lock_irqsave(&info->lock,flags);
1154                 cnow = info->icount;
1155                 spin_unlock_irqrestore(&info->lock,flags);
1156                 p_cuser = argp;
1157                 if (put_user(cnow.cts, &p_cuser->cts) ||
1158                     put_user(cnow.dsr, &p_cuser->dsr) ||
1159                     put_user(cnow.rng, &p_cuser->rng) ||
1160                     put_user(cnow.dcd, &p_cuser->dcd) ||
1161                     put_user(cnow.rx, &p_cuser->rx) ||
1162                     put_user(cnow.tx, &p_cuser->tx) ||
1163                     put_user(cnow.frame, &p_cuser->frame) ||
1164                     put_user(cnow.overrun, &p_cuser->overrun) ||
1165                     put_user(cnow.parity, &p_cuser->parity) ||
1166                     put_user(cnow.brk, &p_cuser->brk) ||
1167                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1168                         ret = -EFAULT;
1169                 ret = 0;
1170                 break;
1171         default:
1172                 ret = -ENOIOCTLCMD;
1173         }
1174         unlock_kernel();
1175         return ret;
1176 }
1177
1178 /*
1179  * support for 32 bit ioctl calls on 64 bit systems
1180  */
1181 #ifdef CONFIG_COMPAT
1182 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1183 {
1184         struct MGSL_PARAMS32 tmp_params;
1185
1186         DBGINFO(("%s get_params32\n", info->device_name));
1187         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1188         tmp_params.loopback        = info->params.loopback;
1189         tmp_params.flags           = info->params.flags;
1190         tmp_params.encoding        = info->params.encoding;
1191         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1192         tmp_params.addr_filter     = info->params.addr_filter;
1193         tmp_params.crc_type        = info->params.crc_type;
1194         tmp_params.preamble_length = info->params.preamble_length;
1195         tmp_params.preamble        = info->params.preamble;
1196         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1197         tmp_params.data_bits       = info->params.data_bits;
1198         tmp_params.stop_bits       = info->params.stop_bits;
1199         tmp_params.parity          = info->params.parity;
1200         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1201                 return -EFAULT;
1202         return 0;
1203 }
1204
1205 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1206 {
1207         struct MGSL_PARAMS32 tmp_params;
1208
1209         DBGINFO(("%s set_params32\n", info->device_name));
1210         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1211                 return -EFAULT;
1212
1213         spin_lock(&info->lock);
1214         info->params.mode            = tmp_params.mode;
1215         info->params.loopback        = tmp_params.loopback;
1216         info->params.flags           = tmp_params.flags;
1217         info->params.encoding        = tmp_params.encoding;
1218         info->params.clock_speed     = tmp_params.clock_speed;
1219         info->params.addr_filter     = tmp_params.addr_filter;
1220         info->params.crc_type        = tmp_params.crc_type;
1221         info->params.preamble_length = tmp_params.preamble_length;
1222         info->params.preamble        = tmp_params.preamble;
1223         info->params.data_rate       = tmp_params.data_rate;
1224         info->params.data_bits       = tmp_params.data_bits;
1225         info->params.stop_bits       = tmp_params.stop_bits;
1226         info->params.parity          = tmp_params.parity;
1227         spin_unlock(&info->lock);
1228
1229         change_params(info);
1230
1231         return 0;
1232 }
1233
1234 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1235                          unsigned int cmd, unsigned long arg)
1236 {
1237         struct slgt_info *info = tty->driver_data;
1238         int rc = -ENOIOCTLCMD;
1239
1240         if (sanity_check(info, tty->name, "compat_ioctl"))
1241                 return -ENODEV;
1242         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1243
1244         switch (cmd) {
1245
1246         case MGSL_IOCSPARAMS32:
1247                 rc = set_params32(info, compat_ptr(arg));
1248                 break;
1249
1250         case MGSL_IOCGPARAMS32:
1251                 rc = get_params32(info, compat_ptr(arg));
1252                 break;
1253
1254         case MGSL_IOCGPARAMS:
1255         case MGSL_IOCSPARAMS:
1256         case MGSL_IOCGTXIDLE:
1257         case MGSL_IOCGSTATS:
1258         case MGSL_IOCWAITEVENT:
1259         case MGSL_IOCGIF:
1260         case MGSL_IOCSGPIO:
1261         case MGSL_IOCGGPIO:
1262         case MGSL_IOCWAITGPIO:
1263         case TIOCGICOUNT:
1264                 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1265                 break;
1266
1267         case MGSL_IOCSTXIDLE:
1268         case MGSL_IOCTXENABLE:
1269         case MGSL_IOCRXENABLE:
1270         case MGSL_IOCTXABORT:
1271         case TIOCMIWAIT:
1272         case MGSL_IOCSIF:
1273                 rc = ioctl(tty, file, cmd, arg);
1274                 break;
1275         }
1276
1277         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1278         return rc;
1279 }
1280 #else
1281 #define slgt_compat_ioctl NULL
1282 #endif /* ifdef CONFIG_COMPAT */
1283
1284 /*
1285  * proc fs support
1286  */
1287 static inline int line_info(char *buf, struct slgt_info *info)
1288 {
1289         char stat_buf[30];
1290         int ret;
1291         unsigned long flags;
1292
1293         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1294                       info->device_name, info->phys_reg_addr,
1295                       info->irq_level, info->max_frame_size);
1296
1297         /* output current serial signal states */
1298         spin_lock_irqsave(&info->lock,flags);
1299         get_signals(info);
1300         spin_unlock_irqrestore(&info->lock,flags);
1301
1302         stat_buf[0] = 0;
1303         stat_buf[1] = 0;
1304         if (info->signals & SerialSignal_RTS)
1305                 strcat(stat_buf, "|RTS");
1306         if (info->signals & SerialSignal_CTS)
1307                 strcat(stat_buf, "|CTS");
1308         if (info->signals & SerialSignal_DTR)
1309                 strcat(stat_buf, "|DTR");
1310         if (info->signals & SerialSignal_DSR)
1311                 strcat(stat_buf, "|DSR");
1312         if (info->signals & SerialSignal_DCD)
1313                 strcat(stat_buf, "|CD");
1314         if (info->signals & SerialSignal_RI)
1315                 strcat(stat_buf, "|RI");
1316
1317         if (info->params.mode != MGSL_MODE_ASYNC) {
1318                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1319                                info->icount.txok, info->icount.rxok);
1320                 if (info->icount.txunder)
1321                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1322                 if (info->icount.txabort)
1323                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1324                 if (info->icount.rxshort)
1325                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1326                 if (info->icount.rxlong)
1327                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1328                 if (info->icount.rxover)
1329                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1330                 if (info->icount.rxcrc)
1331                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1332         } else {
1333                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1334                                info->icount.tx, info->icount.rx);
1335                 if (info->icount.frame)
1336                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1337                 if (info->icount.parity)
1338                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1339                 if (info->icount.brk)
1340                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1341                 if (info->icount.overrun)
1342                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1343         }
1344
1345         /* Append serial signal status to end */
1346         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1347
1348         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1349                        info->tx_active,info->bh_requested,info->bh_running,
1350                        info->pending_bh);
1351
1352         return ret;
1353 }
1354
1355 /* Called to print information about devices
1356  */
1357 static int read_proc(char *page, char **start, off_t off, int count,
1358                      int *eof, void *data)
1359 {
1360         int len = 0, l;
1361         off_t   begin = 0;
1362         struct slgt_info *info;
1363
1364         len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1365
1366         info = slgt_device_list;
1367         while( info ) {
1368                 l = line_info(page + len, info);
1369                 len += l;
1370                 if (len+begin > off+count)
1371                         goto done;
1372                 if (len+begin < off) {
1373                         begin += len;
1374                         len = 0;
1375                 }
1376                 info = info->next_device;
1377         }
1378
1379         *eof = 1;
1380 done:
1381         if (off >= len+begin)
1382                 return 0;
1383         *start = page + (off-begin);
1384         return ((count < begin+len-off) ? count : begin+len-off);
1385 }
1386
1387 /*
1388  * return count of bytes in transmit buffer
1389  */
1390 static int chars_in_buffer(struct tty_struct *tty)
1391 {
1392         struct slgt_info *info = tty->driver_data;
1393         int count;
1394         if (sanity_check(info, tty->name, "chars_in_buffer"))
1395                 return 0;
1396         count = tbuf_bytes(info);
1397         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1398         return count;
1399 }
1400
1401 /*
1402  * signal remote device to throttle send data (our receive data)
1403  */
1404 static void throttle(struct tty_struct * tty)
1405 {
1406         struct slgt_info *info = tty->driver_data;
1407         unsigned long flags;
1408
1409         if (sanity_check(info, tty->name, "throttle"))
1410                 return;
1411         DBGINFO(("%s throttle\n", info->device_name));
1412         if (I_IXOFF(tty))
1413                 send_xchar(tty, STOP_CHAR(tty));
1414         if (tty->termios->c_cflag & CRTSCTS) {
1415                 spin_lock_irqsave(&info->lock,flags);
1416                 info->signals &= ~SerialSignal_RTS;
1417                 set_signals(info);
1418                 spin_unlock_irqrestore(&info->lock,flags);
1419         }
1420 }
1421
1422 /*
1423  * signal remote device to stop throttling send data (our receive data)
1424  */
1425 static void unthrottle(struct tty_struct * tty)
1426 {
1427         struct slgt_info *info = tty->driver_data;
1428         unsigned long flags;
1429
1430         if (sanity_check(info, tty->name, "unthrottle"))
1431                 return;
1432         DBGINFO(("%s unthrottle\n", info->device_name));
1433         if (I_IXOFF(tty)) {
1434                 if (info->x_char)
1435                         info->x_char = 0;
1436                 else
1437                         send_xchar(tty, START_CHAR(tty));
1438         }
1439         if (tty->termios->c_cflag & CRTSCTS) {
1440                 spin_lock_irqsave(&info->lock,flags);
1441                 info->signals |= SerialSignal_RTS;
1442                 set_signals(info);
1443                 spin_unlock_irqrestore(&info->lock,flags);
1444         }
1445 }
1446
1447 /*
1448  * set or clear transmit break condition
1449  * break_state  -1=set break condition, 0=clear
1450  */
1451 static int set_break(struct tty_struct *tty, int break_state)
1452 {
1453         struct slgt_info *info = tty->driver_data;
1454         unsigned short value;
1455         unsigned long flags;
1456
1457         if (sanity_check(info, tty->name, "set_break"))
1458                 return -EINVAL;
1459         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1460
1461         spin_lock_irqsave(&info->lock,flags);
1462         value = rd_reg16(info, TCR);
1463         if (break_state == -1)
1464                 value |= BIT6;
1465         else
1466                 value &= ~BIT6;
1467         wr_reg16(info, TCR, value);
1468         spin_unlock_irqrestore(&info->lock,flags);
1469         return 0;
1470 }
1471
1472 #if SYNCLINK_GENERIC_HDLC
1473
1474 /**
1475  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1476  * set encoding and frame check sequence (FCS) options
1477  *
1478  * dev       pointer to network device structure
1479  * encoding  serial encoding setting
1480  * parity    FCS setting
1481  *
1482  * returns 0 if success, otherwise error code
1483  */
1484 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1485                           unsigned short parity)
1486 {
1487         struct slgt_info *info = dev_to_port(dev);
1488         unsigned char  new_encoding;
1489         unsigned short new_crctype;
1490
1491         /* return error if TTY interface open */
1492         if (info->port.count)
1493                 return -EBUSY;
1494
1495         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1496
1497         switch (encoding)
1498         {
1499         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1500         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1501         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1502         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1503         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1504         default: return -EINVAL;
1505         }
1506
1507         switch (parity)
1508         {
1509         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1510         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1511         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1512         default: return -EINVAL;
1513         }
1514
1515         info->params.encoding = new_encoding;
1516         info->params.crc_type = new_crctype;
1517
1518         /* if network interface up, reprogram hardware */
1519         if (info->netcount)
1520                 program_hw(info);
1521
1522         return 0;
1523 }
1524
1525 /**
1526  * called by generic HDLC layer to send frame
1527  *
1528  * skb  socket buffer containing HDLC frame
1529  * dev  pointer to network device structure
1530  *
1531  * returns 0 if success, otherwise error code
1532  */
1533 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1534 {
1535         struct slgt_info *info = dev_to_port(dev);
1536         unsigned long flags;
1537
1538         DBGINFO(("%s hdlc_xmit\n", dev->name));
1539
1540         /* stop sending until this frame completes */
1541         netif_stop_queue(dev);
1542
1543         /* copy data to device buffers */
1544         info->tx_count = skb->len;
1545         tx_load(info, skb->data, skb->len);
1546
1547         /* update network statistics */
1548         dev->stats.tx_packets++;
1549         dev->stats.tx_bytes += skb->len;
1550
1551         /* done with socket buffer, so free it */
1552         dev_kfree_skb(skb);
1553
1554         /* save start time for transmit timeout detection */
1555         dev->trans_start = jiffies;
1556
1557         /* start hardware transmitter if necessary */
1558         spin_lock_irqsave(&info->lock,flags);
1559         if (!info->tx_active)
1560                 tx_start(info);
1561         spin_unlock_irqrestore(&info->lock,flags);
1562
1563         return 0;
1564 }
1565
1566 /**
1567  * called by network layer when interface enabled
1568  * claim resources and initialize hardware
1569  *
1570  * dev  pointer to network device structure
1571  *
1572  * returns 0 if success, otherwise error code
1573  */
1574 static int hdlcdev_open(struct net_device *dev)
1575 {
1576         struct slgt_info *info = dev_to_port(dev);
1577         int rc;
1578         unsigned long flags;
1579
1580         if (!try_module_get(THIS_MODULE))
1581                 return -EBUSY;
1582
1583         DBGINFO(("%s hdlcdev_open\n", dev->name));
1584
1585         /* generic HDLC layer open processing */
1586         if ((rc = hdlc_open(dev)))
1587                 return rc;
1588
1589         /* arbitrate between network and tty opens */
1590         spin_lock_irqsave(&info->netlock, flags);
1591         if (info->port.count != 0 || info->netcount != 0) {
1592                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1593                 spin_unlock_irqrestore(&info->netlock, flags);
1594                 return -EBUSY;
1595         }
1596         info->netcount=1;
1597         spin_unlock_irqrestore(&info->netlock, flags);
1598
1599         /* claim resources and init adapter */
1600         if ((rc = startup(info)) != 0) {
1601                 spin_lock_irqsave(&info->netlock, flags);
1602                 info->netcount=0;
1603                 spin_unlock_irqrestore(&info->netlock, flags);
1604                 return rc;
1605         }
1606
1607         /* assert DTR and RTS, apply hardware settings */
1608         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1609         program_hw(info);
1610
1611         /* enable network layer transmit */
1612         dev->trans_start = jiffies;
1613         netif_start_queue(dev);
1614
1615         /* inform generic HDLC layer of current DCD status */
1616         spin_lock_irqsave(&info->lock, flags);
1617         get_signals(info);
1618         spin_unlock_irqrestore(&info->lock, flags);
1619         if (info->signals & SerialSignal_DCD)
1620                 netif_carrier_on(dev);
1621         else
1622                 netif_carrier_off(dev);
1623         return 0;
1624 }
1625
1626 /**
1627  * called by network layer when interface is disabled
1628  * shutdown hardware and release resources
1629  *
1630  * dev  pointer to network device structure
1631  *
1632  * returns 0 if success, otherwise error code
1633  */
1634 static int hdlcdev_close(struct net_device *dev)
1635 {
1636         struct slgt_info *info = dev_to_port(dev);
1637         unsigned long flags;
1638
1639         DBGINFO(("%s hdlcdev_close\n", dev->name));
1640
1641         netif_stop_queue(dev);
1642
1643         /* shutdown adapter and release resources */
1644         shutdown(info);
1645
1646         hdlc_close(dev);
1647
1648         spin_lock_irqsave(&info->netlock, flags);
1649         info->netcount=0;
1650         spin_unlock_irqrestore(&info->netlock, flags);
1651
1652         module_put(THIS_MODULE);
1653         return 0;
1654 }
1655
1656 /**
1657  * called by network layer to process IOCTL call to network device
1658  *
1659  * dev  pointer to network device structure
1660  * ifr  pointer to network interface request structure
1661  * cmd  IOCTL command code
1662  *
1663  * returns 0 if success, otherwise error code
1664  */
1665 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1666 {
1667         const size_t size = sizeof(sync_serial_settings);
1668         sync_serial_settings new_line;
1669         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1670         struct slgt_info *info = dev_to_port(dev);
1671         unsigned int flags;
1672
1673         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1674
1675         /* return error if TTY interface open */
1676         if (info->port.count)
1677                 return -EBUSY;
1678
1679         if (cmd != SIOCWANDEV)
1680                 return hdlc_ioctl(dev, ifr, cmd);
1681
1682         switch(ifr->ifr_settings.type) {
1683         case IF_GET_IFACE: /* return current sync_serial_settings */
1684
1685                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1686                 if (ifr->ifr_settings.size < size) {
1687                         ifr->ifr_settings.size = size; /* data size wanted */
1688                         return -ENOBUFS;
1689                 }
1690
1691                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1692                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1693                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1694                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1695
1696                 switch (flags){
1697                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1698                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1699                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1700                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1701                 default: new_line.clock_type = CLOCK_DEFAULT;
1702                 }
1703
1704                 new_line.clock_rate = info->params.clock_speed;
1705                 new_line.loopback   = info->params.loopback ? 1:0;
1706
1707                 if (copy_to_user(line, &new_line, size))
1708                         return -EFAULT;
1709                 return 0;
1710
1711         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1712
1713                 if(!capable(CAP_NET_ADMIN))
1714                         return -EPERM;
1715                 if (copy_from_user(&new_line, line, size))
1716                         return -EFAULT;
1717
1718                 switch (new_line.clock_type)
1719                 {
1720                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1721                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1722                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1723                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1724                 case CLOCK_DEFAULT:  flags = info->params.flags &
1725                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1726                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1727                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1728                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1729                 default: return -EINVAL;
1730                 }
1731
1732                 if (new_line.loopback != 0 && new_line.loopback != 1)
1733                         return -EINVAL;
1734
1735                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1736                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1737                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1738                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1739                 info->params.flags |= flags;
1740
1741                 info->params.loopback = new_line.loopback;
1742
1743                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1744                         info->params.clock_speed = new_line.clock_rate;
1745                 else
1746                         info->params.clock_speed = 0;
1747
1748                 /* if network interface up, reprogram hardware */
1749                 if (info->netcount)
1750                         program_hw(info);
1751                 return 0;
1752
1753         default:
1754                 return hdlc_ioctl(dev, ifr, cmd);
1755         }
1756 }
1757
1758 /**
1759  * called by network layer when transmit timeout is detected
1760  *
1761  * dev  pointer to network device structure
1762  */
1763 static void hdlcdev_tx_timeout(struct net_device *dev)
1764 {
1765         struct slgt_info *info = dev_to_port(dev);
1766         unsigned long flags;
1767
1768         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1769
1770         dev->stats.tx_errors++;
1771         dev->stats.tx_aborted_errors++;
1772
1773         spin_lock_irqsave(&info->lock,flags);
1774         tx_stop(info);
1775         spin_unlock_irqrestore(&info->lock,flags);
1776
1777         netif_wake_queue(dev);
1778 }
1779
1780 /**
1781  * called by device driver when transmit completes
1782  * reenable network layer transmit if stopped
1783  *
1784  * info  pointer to device instance information
1785  */
1786 static void hdlcdev_tx_done(struct slgt_info *info)
1787 {
1788         if (netif_queue_stopped(info->netdev))
1789                 netif_wake_queue(info->netdev);
1790 }
1791
1792 /**
1793  * called by device driver when frame received
1794  * pass frame to network layer
1795  *
1796  * info  pointer to device instance information
1797  * buf   pointer to buffer contianing frame data
1798  * size  count of data bytes in buf
1799  */
1800 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1801 {
1802         struct sk_buff *skb = dev_alloc_skb(size);
1803         struct net_device *dev = info->netdev;
1804
1805         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1806
1807         if (skb == NULL) {
1808                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1809                 dev->stats.rx_dropped++;
1810                 return;
1811         }
1812
1813         memcpy(skb_put(skb, size), buf, size);
1814
1815         skb->protocol = hdlc_type_trans(skb, dev);
1816
1817         dev->stats.rx_packets++;
1818         dev->stats.rx_bytes += size;
1819
1820         netif_rx(skb);
1821
1822         dev->last_rx = jiffies;
1823 }
1824
1825 /**
1826  * called by device driver when adding device instance
1827  * do generic HDLC initialization
1828  *
1829  * info  pointer to device instance information
1830  *
1831  * returns 0 if success, otherwise error code
1832  */
1833 static int hdlcdev_init(struct slgt_info *info)
1834 {
1835         int rc;
1836         struct net_device *dev;
1837         hdlc_device *hdlc;
1838
1839         /* allocate and initialize network and HDLC layer objects */
1840
1841         if (!(dev = alloc_hdlcdev(info))) {
1842                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1843                 return -ENOMEM;
1844         }
1845
1846         /* for network layer reporting purposes only */
1847         dev->mem_start = info->phys_reg_addr;
1848         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1849         dev->irq       = info->irq_level;
1850
1851         /* network layer callbacks and settings */
1852         dev->do_ioctl       = hdlcdev_ioctl;
1853         dev->open           = hdlcdev_open;
1854         dev->stop           = hdlcdev_close;
1855         dev->tx_timeout     = hdlcdev_tx_timeout;
1856         dev->watchdog_timeo = 10*HZ;
1857         dev->tx_queue_len   = 50;
1858
1859         /* generic HDLC layer callbacks and settings */
1860         hdlc         = dev_to_hdlc(dev);
1861         hdlc->attach = hdlcdev_attach;
1862         hdlc->xmit   = hdlcdev_xmit;
1863
1864         /* register objects with HDLC layer */
1865         if ((rc = register_hdlc_device(dev))) {
1866                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1867                 free_netdev(dev);
1868                 return rc;
1869         }
1870
1871         info->netdev = dev;
1872         return 0;
1873 }
1874
1875 /**
1876  * called by device driver when removing device instance
1877  * do generic HDLC cleanup
1878  *
1879  * info  pointer to device instance information
1880  */
1881 static void hdlcdev_exit(struct slgt_info *info)
1882 {
1883         unregister_hdlc_device(info->netdev);
1884         free_netdev(info->netdev);
1885         info->netdev = NULL;
1886 }
1887
1888 #endif /* ifdef CONFIG_HDLC */
1889
1890 /*
1891  * get async data from rx DMA buffers
1892  */
1893 static void rx_async(struct slgt_info *info)
1894 {
1895         struct tty_struct *tty = info->port.tty;
1896         struct mgsl_icount *icount = &info->icount;
1897         unsigned int start, end;
1898         unsigned char *p;
1899         unsigned char status;
1900         struct slgt_desc *bufs = info->rbufs;
1901         int i, count;
1902         int chars = 0;
1903         int stat;
1904         unsigned char ch;
1905
1906         start = end = info->rbuf_current;
1907
1908         while(desc_complete(bufs[end])) {
1909                 count = desc_count(bufs[end]) - info->rbuf_index;
1910                 p     = bufs[end].buf + info->rbuf_index;
1911
1912                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1913                 DBGDATA(info, p, count, "rx");
1914
1915                 for(i=0 ; i < count; i+=2, p+=2) {
1916                         ch = *p;
1917                         icount->rx++;
1918
1919                         stat = 0;
1920
1921                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1922                                 if (status & BIT1)
1923                                         icount->parity++;
1924                                 else if (status & BIT0)
1925                                         icount->frame++;
1926                                 /* discard char if tty control flags say so */
1927                                 if (status & info->ignore_status_mask)
1928                                         continue;
1929                                 if (status & BIT1)
1930                                         stat = TTY_PARITY;
1931                                 else if (status & BIT0)
1932                                         stat = TTY_FRAME;
1933                         }
1934                         if (tty) {
1935                                 tty_insert_flip_char(tty, ch, stat);
1936                                 chars++;
1937                         }
1938                 }
1939
1940                 if (i < count) {
1941                         /* receive buffer not completed */
1942                         info->rbuf_index += i;
1943                         mod_timer(&info->rx_timer, jiffies + 1);
1944                         break;
1945                 }
1946
1947                 info->rbuf_index = 0;
1948                 free_rbufs(info, end, end);
1949
1950                 if (++end == info->rbuf_count)
1951                         end = 0;
1952
1953                 /* if entire list searched then no frame available */
1954                 if (end == start)
1955                         break;
1956         }
1957
1958         if (tty && chars)
1959                 tty_flip_buffer_push(tty);
1960 }
1961
1962 /*
1963  * return next bottom half action to perform
1964  */
1965 static int bh_action(struct slgt_info *info)
1966 {
1967         unsigned long flags;
1968         int rc;
1969
1970         spin_lock_irqsave(&info->lock,flags);
1971
1972         if (info->pending_bh & BH_RECEIVE) {
1973                 info->pending_bh &= ~BH_RECEIVE;
1974                 rc = BH_RECEIVE;
1975         } else if (info->pending_bh & BH_TRANSMIT) {
1976                 info->pending_bh &= ~BH_TRANSMIT;
1977                 rc = BH_TRANSMIT;
1978         } else if (info->pending_bh & BH_STATUS) {
1979                 info->pending_bh &= ~BH_STATUS;
1980                 rc = BH_STATUS;
1981         } else {
1982                 /* Mark BH routine as complete */
1983                 info->bh_running = false;
1984                 info->bh_requested = false;
1985                 rc = 0;
1986         }
1987
1988         spin_unlock_irqrestore(&info->lock,flags);
1989
1990         return rc;
1991 }
1992
1993 /*
1994  * perform bottom half processing
1995  */
1996 static void bh_handler(struct work_struct *work)
1997 {
1998         struct slgt_info *info = container_of(work, struct slgt_info, task);
1999         int action;
2000
2001         if (!info)
2002                 return;
2003         info->bh_running = true;
2004
2005         while((action = bh_action(info))) {
2006                 switch (action) {
2007                 case BH_RECEIVE:
2008                         DBGBH(("%s bh receive\n", info->device_name));
2009                         switch(info->params.mode) {
2010                         case MGSL_MODE_ASYNC:
2011                                 rx_async(info);
2012                                 break;
2013                         case MGSL_MODE_HDLC:
2014                                 while(rx_get_frame(info));
2015                                 break;
2016                         case MGSL_MODE_RAW:
2017                         case MGSL_MODE_MONOSYNC:
2018                         case MGSL_MODE_BISYNC:
2019                                 while(rx_get_buf(info));
2020                                 break;
2021                         }
2022                         /* restart receiver if rx DMA buffers exhausted */
2023                         if (info->rx_restart)
2024                                 rx_start(info);
2025                         break;
2026                 case BH_TRANSMIT:
2027                         bh_transmit(info);
2028                         break;
2029                 case BH_STATUS:
2030                         DBGBH(("%s bh status\n", info->device_name));
2031                         info->ri_chkcount = 0;
2032                         info->dsr_chkcount = 0;
2033                         info->dcd_chkcount = 0;
2034                         info->cts_chkcount = 0;
2035                         break;
2036                 default:
2037                         DBGBH(("%s unknown action\n", info->device_name));
2038                         break;
2039                 }
2040         }
2041         DBGBH(("%s bh_handler exit\n", info->device_name));
2042 }
2043
2044 static void bh_transmit(struct slgt_info *info)
2045 {
2046         struct tty_struct *tty = info->port.tty;
2047
2048         DBGBH(("%s bh_transmit\n", info->device_name));
2049         if (tty)
2050                 tty_wakeup(tty);
2051 }
2052
2053 static void dsr_change(struct slgt_info *info, unsigned short status)
2054 {
2055         if (status & BIT3) {
2056                 info->signals |= SerialSignal_DSR;
2057                 info->input_signal_events.dsr_up++;
2058         } else {
2059                 info->signals &= ~SerialSignal_DSR;
2060                 info->input_signal_events.dsr_down++;
2061         }
2062         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2063         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2064                 slgt_irq_off(info, IRQ_DSR);
2065                 return;
2066         }
2067         info->icount.dsr++;
2068         wake_up_interruptible(&info->status_event_wait_q);
2069         wake_up_interruptible(&info->event_wait_q);
2070         info->pending_bh |= BH_STATUS;
2071 }
2072
2073 static void cts_change(struct slgt_info *info, unsigned short status)
2074 {
2075         if (status & BIT2) {
2076                 info->signals |= SerialSignal_CTS;
2077                 info->input_signal_events.cts_up++;
2078         } else {
2079                 info->signals &= ~SerialSignal_CTS;
2080                 info->input_signal_events.cts_down++;
2081         }
2082         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2083         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2084                 slgt_irq_off(info, IRQ_CTS);
2085                 return;
2086         }
2087         info->icount.cts++;
2088         wake_up_interruptible(&info->status_event_wait_q);
2089         wake_up_interruptible(&info->event_wait_q);
2090         info->pending_bh |= BH_STATUS;
2091
2092         if (info->port.flags & ASYNC_CTS_FLOW) {
2093                 if (info->port.tty) {
2094                         if (info->port.tty->hw_stopped) {
2095                                 if (info->signals & SerialSignal_CTS) {
2096                                         info->port.tty->hw_stopped = 0;
2097                                         info->pending_bh |= BH_TRANSMIT;
2098                                         return;
2099                                 }
2100                         } else {
2101                                 if (!(info->signals & SerialSignal_CTS))
2102                                         info->port.tty->hw_stopped = 1;
2103                         }
2104                 }
2105         }
2106 }
2107
2108 static void dcd_change(struct slgt_info *info, unsigned short status)
2109 {
2110         if (status & BIT1) {
2111                 info->signals |= SerialSignal_DCD;
2112                 info->input_signal_events.dcd_up++;
2113         } else {
2114                 info->signals &= ~SerialSignal_DCD;
2115                 info->input_signal_events.dcd_down++;
2116         }
2117         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2118         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2119                 slgt_irq_off(info, IRQ_DCD);
2120                 return;
2121         }
2122         info->icount.dcd++;
2123 #if SYNCLINK_GENERIC_HDLC
2124         if (info->netcount) {
2125                 if (info->signals & SerialSignal_DCD)
2126                         netif_carrier_on(info->netdev);
2127                 else
2128                         netif_carrier_off(info->netdev);
2129         }
2130 #endif
2131         wake_up_interruptible(&info->status_event_wait_q);
2132         wake_up_interruptible(&info->event_wait_q);
2133         info->pending_bh |= BH_STATUS;
2134
2135         if (info->port.flags & ASYNC_CHECK_CD) {
2136                 if (info->signals & SerialSignal_DCD)
2137                         wake_up_interruptible(&info->port.open_wait);
2138                 else {
2139                         if (info->port.tty)
2140                                 tty_hangup(info->port.tty);
2141                 }
2142         }
2143 }
2144
2145 static void ri_change(struct slgt_info *info, unsigned short status)
2146 {
2147         if (status & BIT0) {
2148                 info->signals |= SerialSignal_RI;
2149                 info->input_signal_events.ri_up++;
2150         } else {
2151                 info->signals &= ~SerialSignal_RI;
2152                 info->input_signal_events.ri_down++;
2153         }
2154         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2155         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2156                 slgt_irq_off(info, IRQ_RI);
2157                 return;
2158         }
2159         info->icount.rng++;
2160         wake_up_interruptible(&info->status_event_wait_q);
2161         wake_up_interruptible(&info->event_wait_q);
2162         info->pending_bh |= BH_STATUS;
2163 }
2164
2165 static void isr_serial(struct slgt_info *info)
2166 {
2167         unsigned short status = rd_reg16(info, SSR);
2168
2169         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2170
2171         wr_reg16(info, SSR, status); /* clear pending */
2172
2173         info->irq_occurred = true;
2174
2175         if (info->params.mode == MGSL_MODE_ASYNC) {
2176                 if (status & IRQ_TXIDLE) {
2177                         if (info->tx_count)
2178                                 isr_txeom(info, status);
2179                 }
2180                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2181                         info->icount.brk++;
2182                         /* process break detection if tty control allows */
2183                         if (info->port.tty) {
2184                                 if (!(status & info->ignore_status_mask)) {
2185                                         if (info->read_status_mask & MASK_BREAK) {
2186                                                 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2187                                                 if (info->port.flags & ASYNC_SAK)
2188                                                         do_SAK(info->port.tty);
2189                                         }
2190                                 }
2191                         }
2192                 }
2193         } else {
2194                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2195                         isr_txeom(info, status);
2196
2197                 if (status & IRQ_RXIDLE) {
2198                         if (status & RXIDLE)
2199                                 info->icount.rxidle++;
2200                         else
2201                                 info->icount.exithunt++;
2202                         wake_up_interruptible(&info->event_wait_q);
2203                 }
2204
2205                 if (status & IRQ_RXOVER)
2206                         rx_start(info);
2207         }
2208
2209         if (status & IRQ_DSR)
2210                 dsr_change(info, status);
2211         if (status & IRQ_CTS)
2212                 cts_change(info, status);
2213         if (status & IRQ_DCD)
2214                 dcd_change(info, status);
2215         if (status & IRQ_RI)
2216                 ri_change(info, status);
2217 }
2218
2219 static void isr_rdma(struct slgt_info *info)
2220 {
2221         unsigned int status = rd_reg32(info, RDCSR);
2222
2223         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2224
2225         /* RDCSR (rx DMA control/status)
2226          *
2227          * 31..07  reserved
2228          * 06      save status byte to DMA buffer
2229          * 05      error
2230          * 04      eol (end of list)
2231          * 03      eob (end of buffer)
2232          * 02      IRQ enable
2233          * 01      reset
2234          * 00      enable
2235          */
2236         wr_reg32(info, RDCSR, status);  /* clear pending */
2237
2238         if (status & (BIT5 + BIT4)) {
2239                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2240                 info->rx_restart = true;
2241         }
2242         info->pending_bh |= BH_RECEIVE;
2243 }
2244
2245 static void isr_tdma(struct slgt_info *info)
2246 {
2247         unsigned int status = rd_reg32(info, TDCSR);
2248
2249         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2250
2251         /* TDCSR (tx DMA control/status)
2252          *
2253          * 31..06  reserved
2254          * 05      error
2255          * 04      eol (end of list)
2256          * 03      eob (end of buffer)
2257          * 02      IRQ enable
2258          * 01      reset
2259          * 00      enable
2260          */
2261         wr_reg32(info, TDCSR, status);  /* clear pending */
2262
2263         if (status & (BIT5 + BIT4 + BIT3)) {
2264                 // another transmit buffer has completed
2265                 // run bottom half to get more send data from user
2266                 info->pending_bh |= BH_TRANSMIT;
2267         }
2268 }
2269
2270 static void isr_txeom(struct slgt_info *info, unsigned short status)
2271 {
2272         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2273
2274         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2275         tdma_reset(info);
2276         reset_tbufs(info);
2277         if (status & IRQ_TXUNDER) {
2278                 unsigned short val = rd_reg16(info, TCR);
2279                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2280                 wr_reg16(info, TCR, val); /* clear reset bit */
2281         }
2282
2283         if (info->tx_active) {
2284                 if (info->params.mode != MGSL_MODE_ASYNC) {
2285                         if (status & IRQ_TXUNDER)
2286                                 info->icount.txunder++;
2287                         else if (status & IRQ_TXIDLE)
2288                                 info->icount.txok++;
2289                 }
2290
2291                 info->tx_active = false;
2292                 info->tx_count = 0;
2293
2294                 del_timer(&info->tx_timer);
2295
2296                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2297                         info->signals &= ~SerialSignal_RTS;
2298                         info->drop_rts_on_tx_done = false;
2299                         set_signals(info);
2300                 }
2301
2302 #if SYNCLINK_GENERIC_HDLC
2303                 if (info->netcount)
2304                         hdlcdev_tx_done(info);
2305                 else
2306 #endif
2307                 {
2308                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2309                                 tx_stop(info);
2310                                 return;
2311                         }
2312                         info->pending_bh |= BH_TRANSMIT;
2313                 }
2314         }
2315 }
2316
2317 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2318 {
2319         struct cond_wait *w, *prev;
2320
2321         /* wake processes waiting for specific transitions */
2322         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2323                 if (w->data & changed) {
2324                         w->data = state;
2325                         wake_up_interruptible(&w->q);
2326                         if (prev != NULL)
2327                                 prev->next = w->next;
2328                         else
2329                                 info->gpio_wait_q = w->next;
2330                 } else
2331                         prev = w;
2332         }
2333 }
2334
2335 /* interrupt service routine
2336  *
2337  *      irq     interrupt number
2338  *      dev_id  device ID supplied during interrupt registration
2339  */
2340 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2341 {
2342         struct slgt_info *info = dev_id;
2343         unsigned int gsr;
2344         unsigned int i;
2345
2346         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2347
2348         spin_lock(&info->lock);
2349
2350         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2351                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2352                 info->irq_occurred = true;
2353                 for(i=0; i < info->port_count ; i++) {
2354                         if (info->port_array[i] == NULL)
2355                                 continue;
2356                         if (gsr & (BIT8 << i))
2357                                 isr_serial(info->port_array[i]);
2358                         if (gsr & (BIT16 << (i*2)))
2359                                 isr_rdma(info->port_array[i]);
2360                         if (gsr & (BIT17 << (i*2)))
2361                                 isr_tdma(info->port_array[i]);
2362                 }
2363         }
2364
2365         if (info->gpio_present) {
2366                 unsigned int state;
2367                 unsigned int changed;
2368                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2369                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2370                         /* read latched state of GPIO signals */
2371                         state = rd_reg32(info, IOVR);
2372                         /* clear pending GPIO interrupt bits */
2373                         wr_reg32(info, IOSR, changed);
2374                         for (i=0 ; i < info->port_count ; i++) {
2375                                 if (info->port_array[i] != NULL)
2376                                         isr_gpio(info->port_array[i], changed, state);
2377                         }
2378                 }
2379         }
2380
2381         for(i=0; i < info->port_count ; i++) {
2382                 struct slgt_info *port = info->port_array[i];
2383
2384                 if (port && (port->port.count || port->netcount) &&
2385                     port->pending_bh && !port->bh_running &&
2386                     !port->bh_requested) {
2387                         DBGISR(("%s bh queued\n", port->device_name));
2388                         schedule_work(&port->task);
2389                         port->bh_requested = true;
2390                 }
2391         }
2392
2393         spin_unlock(&info->lock);
2394
2395         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2396         return IRQ_HANDLED;
2397 }
2398
2399 static int startup(struct slgt_info *info)
2400 {
2401         DBGINFO(("%s startup\n", info->device_name));
2402
2403         if (info->port.flags & ASYNC_INITIALIZED)
2404                 return 0;
2405
2406         if (!info->tx_buf) {
2407                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2408                 if (!info->tx_buf) {
2409                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2410                         return -ENOMEM;
2411                 }
2412         }
2413
2414         info->pending_bh = 0;
2415
2416         memset(&info->icount, 0, sizeof(info->icount));
2417
2418         /* program hardware for current parameters */
2419         change_params(info);
2420
2421         if (info->port.tty)
2422                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2423
2424         info->port.flags |= ASYNC_INITIALIZED;
2425
2426         return 0;
2427 }
2428
2429 /*
2430  *  called by close() and hangup() to shutdown hardware
2431  */
2432 static void shutdown(struct slgt_info *info)
2433 {
2434         unsigned long flags;
2435
2436         if (!(info->port.flags & ASYNC_INITIALIZED))
2437                 return;
2438
2439         DBGINFO(("%s shutdown\n", info->device_name));
2440
2441         /* clear status wait queue because status changes */
2442         /* can't happen after shutting down the hardware */
2443         wake_up_interruptible(&info->status_event_wait_q);
2444         wake_up_interruptible(&info->event_wait_q);
2445
2446         del_timer_sync(&info->tx_timer);
2447         del_timer_sync(&info->rx_timer);
2448
2449         kfree(info->tx_buf);
2450         info->tx_buf = NULL;
2451
2452         spin_lock_irqsave(&info->lock,flags);
2453
2454         tx_stop(info);
2455         rx_stop(info);
2456
2457         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2458
2459         if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2460                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2461                 set_signals(info);
2462         }
2463
2464         flush_cond_wait(&info->gpio_wait_q);
2465
2466         spin_unlock_irqrestore(&info->lock,flags);
2467
2468         if (info->port.tty)
2469                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2470
2471         info->port.flags &= ~ASYNC_INITIALIZED;
2472 }
2473
2474 static void program_hw(struct slgt_info *info)
2475 {
2476         unsigned long flags;
2477
2478         spin_lock_irqsave(&info->lock,flags);
2479
2480         rx_stop(info);
2481         tx_stop(info);
2482
2483         if (info->params.mode != MGSL_MODE_ASYNC ||
2484             info->netcount)
2485                 sync_mode(info);
2486         else
2487                 async_mode(info);
2488
2489         set_signals(info);
2490
2491         info->dcd_chkcount = 0;
2492         info->cts_chkcount = 0;
2493         info->ri_chkcount = 0;
2494         info->dsr_chkcount = 0;
2495
2496         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2497         get_signals(info);
2498
2499         if (info->netcount ||
2500             (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2501                 rx_start(info);
2502
2503         spin_unlock_irqrestore(&info->lock,flags);
2504 }
2505
2506 /*
2507  * reconfigure adapter based on new parameters
2508  */
2509 static void change_params(struct slgt_info *info)
2510 {
2511         unsigned cflag;
2512         int bits_per_char;
2513
2514         if (!info->port.tty || !info->port.tty->termios)
2515                 return;
2516         DBGINFO(("%s change_params\n", info->device_name));
2517
2518         cflag = info->port.tty->termios->c_cflag;
2519
2520         /* if B0 rate (hangup) specified then negate DTR and RTS */
2521         /* otherwise assert DTR and RTS */
2522         if (cflag & CBAUD)
2523                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2524         else
2525                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2526
2527         /* byte size and parity */
2528
2529         switch (cflag & CSIZE) {
2530         case CS5: info->params.data_bits = 5; break;
2531         case CS6: info->params.data_bits = 6; break;
2532         case CS7: info->params.data_bits = 7; break;
2533         case CS8: info->params.data_bits = 8; break;
2534         default:  info->params.data_bits = 7; break;
2535         }
2536
2537         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2538
2539         if (cflag & PARENB)
2540                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2541         else
2542                 info->params.parity = ASYNC_PARITY_NONE;
2543
2544         /* calculate number of jiffies to transmit a full
2545          * FIFO (32 bytes) at specified data rate
2546          */
2547         bits_per_char = info->params.data_bits +
2548                         info->params.stop_bits + 1;
2549
2550         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2551
2552         if (info->params.data_rate) {
2553                 info->timeout = (32*HZ*bits_per_char) /
2554                                 info->params.data_rate;
2555         }
2556         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2557
2558         if (cflag & CRTSCTS)
2559                 info->port.flags |= ASYNC_CTS_FLOW;
2560         else
2561                 info->port.flags &= ~ASYNC_CTS_FLOW;
2562
2563         if (cflag & CLOCAL)
2564                 info->port.flags &= ~ASYNC_CHECK_CD;
2565         else
2566                 info->port.flags |= ASYNC_CHECK_CD;
2567
2568         /* process tty input control flags */
2569
2570         info->read_status_mask = IRQ_RXOVER;
2571         if (I_INPCK(info->port.tty))
2572                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2573         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2574                 info->read_status_mask |= MASK_BREAK;
2575         if (I_IGNPAR(info->port.tty))
2576                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2577         if (I_IGNBRK(info->port.tty)) {
2578                 info->ignore_status_mask |= MASK_BREAK;
2579                 /* If ignoring parity and break indicators, ignore
2580                  * overruns too.  (For real raw support).
2581                  */
2582                 if (I_IGNPAR(info->port.tty))
2583                         info->ignore_status_mask |= MASK_OVERRUN;
2584         }
2585
2586         program_hw(info);
2587 }
2588
2589 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2590 {
2591         DBGINFO(("%s get_stats\n",  info->device_name));
2592         if (!user_icount) {
2593                 memset(&info->icount, 0, sizeof(info->icount));
2594         } else {
2595                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2596                         return -EFAULT;
2597         }
2598         return 0;
2599 }
2600
2601 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2602 {
2603         DBGINFO(("%s get_params\n", info->device_name));
2604         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2605                 return -EFAULT;
2606         return 0;
2607 }
2608
2609 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2610 {
2611         unsigned long flags;
2612         MGSL_PARAMS tmp_params;
2613
2614         DBGINFO(("%s set_params\n", info->device_name));
2615         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2616                 return -EFAULT;
2617
2618         spin_lock_irqsave(&info->lock, flags);
2619         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2620         spin_unlock_irqrestore(&info->lock, flags);
2621
2622         change_params(info);
2623
2624         return 0;
2625 }
2626
2627 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2628 {
2629         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2630         if (put_user(info->idle_mode, idle_mode))
2631                 return -EFAULT;
2632         return 0;
2633 }
2634
2635 static int set_txidle(struct slgt_info *info, int idle_mode)
2636 {
2637         unsigned long flags;
2638         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2639         spin_lock_irqsave(&info->lock,flags);
2640         info->idle_mode = idle_mode;
2641         if (info->params.mode != MGSL_MODE_ASYNC)
2642                 tx_set_idle(info);
2643         spin_unlock_irqrestore(&info->lock,flags);
2644         return 0;
2645 }
2646
2647 static int tx_enable(struct slgt_info *info, int enable)
2648 {
2649         unsigned long flags;
2650         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2651         spin_lock_irqsave(&info->lock,flags);
2652         if (enable) {
2653                 if (!info->tx_enabled)
2654                         tx_start(info);
2655         } else {
2656                 if (info->tx_enabled)
2657                         tx_stop(info);
2658         }
2659         spin_unlock_irqrestore(&info->lock,flags);
2660         return 0;
2661 }
2662
2663 /*
2664  * abort transmit HDLC frame
2665  */
2666 static int tx_abort(struct slgt_info *info)
2667 {
2668         unsigned long flags;
2669         DBGINFO(("%s tx_abort\n", info->device_name));
2670         spin_lock_irqsave(&info->lock,flags);
2671         tdma_reset(info);
2672         spin_unlock_irqrestore(&info->lock,flags);
2673         return 0;
2674 }
2675
2676 static int rx_enable(struct slgt_info *info, int enable)
2677 {
2678         unsigned long flags;
2679         unsigned int rbuf_fill_level;
2680         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2681         spin_lock_irqsave(&info->lock,flags);
2682         /*
2683          * enable[31..16] = receive DMA buffer fill level
2684          * 0 = noop (leave fill level unchanged)
2685          * fill level must be multiple of 4 and <= buffer size
2686          */
2687         rbuf_fill_level = ((unsigned int)enable) >> 16;
2688         if (rbuf_fill_level) {
2689                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2690                         spin_unlock_irqrestore(&info->lock, flags);
2691                         return -EINVAL;
2692                 }
2693                 info->rbuf_fill_level = rbuf_fill_level;
2694                 rx_stop(info); /* restart receiver to use new fill level */
2695         }
2696
2697         /*
2698          * enable[1..0] = receiver enable command
2699          * 0 = disable
2700          * 1 = enable
2701          * 2 = enable or force hunt mode if already enabled
2702          */
2703         enable &= 3;
2704         if (enable) {
2705                 if (!info->rx_enabled)
2706                         rx_start(info);
2707                 else if (enable == 2) {
2708                         /* force hunt mode (write 1 to RCR[3]) */
2709                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2710                 }
2711         } else {
2712                 if (info->rx_enabled)
2713                         rx_stop(info);
2714         }
2715         spin_unlock_irqrestore(&info->lock,flags);
2716         return 0;
2717 }
2718
2719 /*
2720  *  wait for specified event to occur
2721  */
2722 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2723 {
2724         unsigned long flags;
2725         int s;
2726         int rc=0;
2727         struct mgsl_icount cprev, cnow;
2728         int events;
2729         int mask;
2730         struct  _input_signal_events oldsigs, newsigs;
2731         DECLARE_WAITQUEUE(wait, current);
2732
2733         if (get_user(mask, mask_ptr))
2734                 return -EFAULT;
2735
2736         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2737
2738         spin_lock_irqsave(&info->lock,flags);
2739
2740         /* return immediately if state matches requested events */
2741         get_signals(info);
2742         s = info->signals;
2743
2744         events = mask &
2745                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2746                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2747                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2748                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2749         if (events) {
2750                 spin_unlock_irqrestore(&info->lock,flags);
2751                 goto exit;
2752         }
2753
2754         /* save current irq counts */
2755         cprev = info->icount;
2756         oldsigs = info->input_signal_events;
2757
2758         /* enable hunt and idle irqs if needed */
2759         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2760                 unsigned short val = rd_reg16(info, SCR);
2761                 if (!(val & IRQ_RXIDLE))
2762                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2763         }
2764
2765         set_current_state(TASK_INTERRUPTIBLE);
2766         add_wait_queue(&info->event_wait_q, &wait);
2767
2768         spin_unlock_irqrestore(&info->lock,flags);
2769
2770         for(;;) {
2771                 schedule();
2772                 if (signal_pending(current)) {
2773                         rc = -ERESTARTSYS;
2774                         break;
2775                 }
2776
2777                 /* get current irq counts */
2778                 spin_lock_irqsave(&info->lock,flags);
2779                 cnow = info->icount;
2780                 newsigs = info->input_signal_events;
2781                 set_current_state(TASK_INTERRUPTIBLE);
2782                 spin_unlock_irqrestore(&info->lock,flags);
2783
2784                 /* if no change, wait aborted for some reason */
2785                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2786                     newsigs.dsr_down == oldsigs.dsr_down &&
2787                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2788                     newsigs.dcd_down == oldsigs.dcd_down &&
2789                     newsigs.cts_up   == oldsigs.cts_up   &&
2790                     newsigs.cts_down == oldsigs.cts_down &&
2791                     newsigs.ri_up    == oldsigs.ri_up    &&
2792                     newsigs.ri_down  == oldsigs.ri_down  &&
2793                     cnow.exithunt    == cprev.exithunt   &&
2794                     cnow.rxidle      == cprev.rxidle) {
2795                         rc = -EIO;
2796                         break;
2797                 }
2798
2799                 events = mask &
2800                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2801                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2802                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2803                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2804                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2805                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2806                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2807                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2808                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2809                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2810                 if (events)
2811                         break;
2812
2813                 cprev = cnow;
2814                 oldsigs = newsigs;
2815         }
2816
2817         remove_wait_queue(&info->event_wait_q, &wait);
2818         set_current_state(TASK_RUNNING);
2819
2820
2821         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2822                 spin_lock_irqsave(&info->lock,flags);
2823                 if (!waitqueue_active(&info->event_wait_q)) {
2824                         /* disable enable exit hunt mode/idle rcvd IRQs */
2825                         wr_reg16(info, SCR,
2826                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2827                 }
2828                 spin_unlock_irqrestore(&info->lock,flags);
2829         }
2830 exit:
2831         if (rc == 0)
2832                 rc = put_user(events, mask_ptr);
2833         return rc;
2834 }
2835
2836 static int get_interface(struct slgt_info *info, int __user *if_mode)
2837 {
2838         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2839         if (put_user(info->if_mode, if_mode))
2840                 return -EFAULT;
2841         return 0;
2842 }
2843
2844 static int set_interface(struct slgt_info *info, int if_mode)
2845 {
2846         unsigned long flags;
2847         unsigned short val;
2848
2849         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2850         spin_lock_irqsave(&info->lock,flags);
2851         info->if_mode = if_mode;
2852
2853         msc_set_vcr(info);
2854
2855         /* TCR (tx control) 07  1=RTS driver control */
2856         val = rd_reg16(info, TCR);
2857         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2858                 val |= BIT7;
2859         else
2860                 val &= ~BIT7;
2861         wr_reg16(info, TCR, val);
2862
2863         spin_unlock_irqrestore(&info->lock,flags);
2864         return 0;
2865 }
2866
2867 /*
2868  * set general purpose IO pin state and direction
2869  *
2870  * user_gpio fields:
2871  * state   each bit indicates a pin state
2872  * smask   set bit indicates pin state to set
2873  * dir     each bit indicates a pin direction (0=input, 1=output)
2874  * dmask   set bit indicates pin direction to set
2875  */
2876 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2877 {
2878         unsigned long flags;
2879         struct gpio_desc gpio;
2880         __u32 data;
2881
2882         if (!info->gpio_present)
2883                 return -EINVAL;
2884         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2885                 return -EFAULT;
2886         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2887                  info->device_name, gpio.state, gpio.smask,
2888                  gpio.dir, gpio.dmask));
2889
2890         spin_lock_irqsave(&info->lock,flags);
2891         if (gpio.dmask) {
2892                 data = rd_reg32(info, IODR);
2893                 data |= gpio.dmask & gpio.dir;
2894                 data &= ~(gpio.dmask & ~gpio.dir);
2895                 wr_reg32(info, IODR, data);
2896         }
2897         if (gpio.smask) {
2898                 data = rd_reg32(info, IOVR);
2899                 data |= gpio.smask & gpio.state;
2900                 data &= ~(gpio.smask & ~gpio.state);
2901                 wr_reg32(info, IOVR, data);
2902         }
2903         spin_unlock_irqrestore(&info->lock,flags);
2904
2905         return 0;
2906 }
2907
2908 /*
2909  * get general purpose IO pin state and direction
2910  */
2911 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2912 {
2913         struct gpio_desc gpio;
2914         if (!info->gpio_present)
2915                 return -EINVAL;
2916         gpio.state = rd_reg32(info, IOVR);
2917         gpio.smask = 0xffffffff;
2918         gpio.dir   = rd_reg32(info, IODR);
2919         gpio.dmask = 0xffffffff;
2920         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2921                 return -EFAULT;
2922         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2923                  info->device_name, gpio.state, gpio.dir));
2924         return 0;
2925 }
2926
2927 /*
2928  * conditional wait facility
2929  */
2930 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2931 {
2932         init_waitqueue_head(&w->q);
2933         init_waitqueue_entry(&w->wait, current);
2934         w->data = data;
2935 }
2936
2937 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2938 {
2939         set_current_state(TASK_INTERRUPTIBLE);
2940         add_wait_queue(&w->q, &w->wait);
2941         w->next = *head;
2942         *head = w;
2943 }
2944
2945 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2946 {
2947         struct cond_wait *w, *prev;
2948         remove_wait_queue(&cw->q, &cw->wait);
2949         set_current_state(TASK_RUNNING);
2950         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2951                 if (w == cw) {
2952                         if (prev != NULL)
2953                                 prev->next = w->next;
2954                         else
2955                                 *head = w->next;
2956                         break;
2957                 }
2958         }
2959 }
2960
2961 static void flush_cond_wait(struct cond_wait **head)
2962 {
2963         while (*head != NULL) {
2964                 wake_up_interruptible(&(*head)->q);
2965                 *head = (*head)->next;
2966         }
2967 }
2968
2969 /*
2970  * wait for general purpose I/O pin(s) to enter specified state
2971  *
2972  * user_gpio fields:
2973  * state - bit indicates target pin state
2974  * smask - set bit indicates watched pin
2975  *
2976  * The wait ends when at least one watched pin enters the specified
2977  * state. When 0 (no error) is returned, user_gpio->state is set to the
2978  * state of all GPIO pins when the wait ends.
2979  *
2980  * Note: Each pin may be a dedicated input, dedicated output, or
2981  * configurable input/output. The number and configuration of pins
2982  * varies with the specific adapter model. Only input pins (dedicated
2983  * or configured) can be monitored with this function.
2984  */
2985 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2986 {
2987         unsigned long flags;
2988         int rc = 0;
2989         struct gpio_desc gpio;
2990         struct cond_wait wait;
2991         u32 state;
2992
2993         if (!info->gpio_present)
2994                 return -EINVAL;
2995         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2996                 return -EFAULT;
2997         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2998                  info->device_name, gpio.state, gpio.smask));
2999         /* ignore output pins identified by set IODR bit */
3000         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3001                 return -EINVAL;
3002         init_cond_wait(&wait, gpio.smask);
3003
3004         spin_lock_irqsave(&info->lock, flags);
3005         /* enable interrupts for watched pins */
3006         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3007         /* get current pin states */
3008         state = rd_reg32(info, IOVR);
3009
3010         if (gpio.smask & ~(state ^ gpio.state)) {
3011                 /* already in target state */
3012                 gpio.state = state;
3013         } else {
3014                 /* wait for target state */
3015                 add_cond_wait(&info->gpio_wait_q, &wait);
3016                 spin_unlock_irqrestore(&info->lock, flags);
3017                 schedule();
3018                 if (signal_pending(current))
3019                         rc = -ERESTARTSYS;
3020                 else
3021                         gpio.state = wait.data;
3022                 spin_lock_irqsave(&info->lock, flags);
3023                 remove_cond_wait(&info->gpio_wait_q, &wait);
3024         }
3025
3026         /* disable all GPIO interrupts if no waiting processes */
3027         if (info->gpio_wait_q == NULL)
3028                 wr_reg32(info, IOER, 0);
3029         spin_unlock_irqrestore(&info->lock,flags);
3030
3031         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3032                 rc = -EFAULT;
3033         return rc;
3034 }
3035
3036 static int modem_input_wait(struct slgt_info *info,int arg)
3037 {
3038         unsigned long flags;
3039         int rc;
3040         struct mgsl_icount cprev, cnow;
3041         DECLARE_WAITQUEUE(wait, current);
3042
3043         /* save current irq counts */
3044         spin_lock_irqsave(&info->lock,flags);
3045         cprev = info->icount;
3046         add_wait_queue(&info->status_event_wait_q, &wait);
3047         set_current_state(TASK_INTERRUPTIBLE);
3048         spin_unlock_irqrestore(&info->lock,flags);
3049
3050         for(;;) {
3051                 schedule();
3052                 if (signal_pending(current)) {
3053                         rc = -ERESTARTSYS;
3054                         break;
3055                 }
3056
3057                 /* get new irq counts */
3058                 spin_lock_irqsave(&info->lock,flags);
3059                 cnow = info->icount;
3060                 set_current_state(TASK_INTERRUPTIBLE);
3061                 spin_unlock_irqrestore(&info->lock,flags);
3062
3063                 /* if no change, wait aborted for some reason */
3064                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3065                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3066                         rc = -EIO;
3067                         break;
3068                 }
3069
3070                 /* check for change in caller specified modem input */
3071                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3072                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3073                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3074                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3075                         rc = 0;
3076                         break;
3077                 }
3078
3079                 cprev = cnow;
3080         }
3081         remove_wait_queue(&info->status_event_wait_q, &wait);
3082         set_current_state(TASK_RUNNING);
3083         return rc;
3084 }
3085
3086 /*
3087  *  return state of serial control and status signals
3088  */
3089 static int tiocmget(struct tty_struct *tty, struct file *file)
3090 {
3091         struct slgt_info *info = tty->driver_data;
3092         unsigned int result;
3093         unsigned long flags;
3094
3095         spin_lock_irqsave(&info->lock,flags);
3096         get_signals(info);
3097         spin_unlock_irqrestore(&info->lock,flags);
3098
3099         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3100                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3101                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3102                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3103                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3104                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3105
3106         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3107         return result;
3108 }
3109
3110 /*
3111  * set modem control signals (DTR/RTS)
3112  *
3113  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3114  *              TIOCMSET = set/clear signal values
3115  *      value   bit mask for command
3116  */
3117 static int tiocmset(struct tty_struct *tty, struct file *file,
3118                     unsigned int set, unsigned int clear)
3119 {
3120         struct slgt_info *info = tty->driver_data;
3121         unsigned long flags;
3122
3123         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3124
3125         if (set & TIOCM_RTS)
3126                 info->signals |= SerialSignal_RTS;
3127         if (set & TIOCM_DTR)
3128                 info->signals |= SerialSignal_DTR;
3129         if (clear & TIOCM_RTS)
3130                 info->signals &= ~SerialSignal_RTS;
3131         if (clear & TIOCM_DTR)
3132                 info->signals &= ~SerialSignal_DTR;
3133
3134         spin_lock_irqsave(&info->lock,flags);
3135         set_signals(info);
3136         spin_unlock_irqrestore(&info->lock,flags);
3137         return 0;
3138 }
3139
3140 /*
3141  *  block current process until the device is ready to open
3142  */
3143 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3144                            struct slgt_info *info)
3145 {
3146         DECLARE_WAITQUEUE(wait, current);
3147         int             retval;
3148         bool            do_clocal = false;
3149         bool            extra_count = false;
3150         unsigned long   flags;
3151
3152         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3153
3154         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3155                 /* nonblock mode is set or port is not enabled */
3156                 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3157                 return 0;
3158         }
3159
3160         if (tty->termios->c_cflag & CLOCAL)
3161                 do_clocal = true;
3162
3163         /* Wait for carrier detect and the line to become
3164          * free (i.e., not in use by the callout).  While we are in
3165          * this loop, info->port.count is dropped by one, so that
3166          * close() knows when to free things.  We restore it upon
3167          * exit, either normal or abnormal.
3168          */
3169
3170         retval = 0;
3171         add_wait_queue(&info->port.open_wait, &wait);
3172
3173         spin_lock_irqsave(&info->lock, flags);
3174         if (!tty_hung_up_p(filp)) {
3175                 extra_count = true;
3176                 info->port.count--;
3177         }
3178         spin_unlock_irqrestore(&info->lock, flags);
3179         info->port.blocked_open++;
3180
3181         while (1) {
3182                 if ((tty->termios->c_cflag & CBAUD)) {
3183                         spin_lock_irqsave(&info->lock,flags);
3184                         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3185                         set_signals(info);
3186                         spin_unlock_irqrestore(&info->lock,flags);
3187                 }
3188
3189                 set_current_state(TASK_INTERRUPTIBLE);
3190
3191                 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3192                         retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3193                                         -EAGAIN : -ERESTARTSYS;
3194                         break;
3195                 }
3196
3197                 spin_lock_irqsave(&info->lock,flags);
3198                 get_signals(info);
3199                 spin_unlock_irqrestore(&info->lock,flags);
3200
3201                 if (!(info->port.flags & ASYNC_CLOSING) &&
3202                     (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3203                         break;
3204                 }
3205
3206                 if (signal_pending(current)) {
3207                         retval = -ERESTARTSYS;
3208                         break;
3209                 }
3210
3211                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3212                 schedule();
3213         }
3214
3215         set_current_state(TASK_RUNNING);
3216         remove_wait_queue(&info->port.open_wait, &wait);
3217
3218         if (extra_count)
3219                 info->port.count++;
3220         info->port.blocked_open--;
3221
3222         if (!retval)
3223                 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3224
3225         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3226         return retval;
3227 }
3228
3229 static int alloc_tmp_rbuf(struct slgt_info *info)
3230 {
3231         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3232         if (info->tmp_rbuf == NULL)
3233                 return -ENOMEM;
3234         return 0;
3235 }
3236
3237 static void free_tmp_rbuf(struct slgt_info *info)
3238 {
3239         kfree(info->tmp_rbuf);
3240         info->tmp_rbuf = NULL;
3241 }
3242
3243 /*
3244  * allocate DMA descriptor lists.
3245  */
3246 static int alloc_desc(struct slgt_info *info)
3247 {
3248         unsigned int i;
3249         unsigned int pbufs;
3250
3251         /* allocate memory to hold descriptor lists */
3252         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3253         if (info->bufs == NULL)
3254                 return -ENOMEM;
3255
3256         memset(info->bufs, 0, DESC_LIST_SIZE);
3257
3258         info->rbufs = (struct slgt_desc*)info->bufs;
3259         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3260
3261         pbufs = (unsigned int)info->bufs_dma_addr;
3262
3263         /*
3264          * Build circular lists of descriptors
3265          */
3266
3267         for (i=0; i < info->rbuf_count; i++) {
3268                 /* physical address of this descriptor */
3269                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3270
3271                 /* physical address of next descriptor */
3272                 if (i == info->rbuf_count - 1)
3273                         info->rbufs[i].next = cpu_to_le32(pbufs);
3274                 else
3275                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3276                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3277         }
3278
3279         for (i=0; i < info->tbuf_count; i++) {
3280                 /* physical address of this descriptor */
3281                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3282
3283                 /* physical address of next descriptor */
3284                 if (i == info->tbuf_count - 1)
3285                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3286                 else
3287                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3288         }
3289
3290         return 0;
3291 }
3292
3293 static void free_desc(struct slgt_info *info)
3294 {
3295         if (info->bufs != NULL) {
3296                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3297                 info->bufs  = NULL;
3298                 info->rbufs = NULL;
3299                 info->tbufs = NULL;
3300         }
3301 }
3302
3303 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3304 {
3305         int i;
3306         for (i=0; i < count; i++) {
3307                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3308                         return -ENOMEM;
3309                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3310         }
3311         return 0;
3312 }
3313
3314 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3315 {
3316         int i;
3317         for (i=0; i < count; i++) {
3318                 if (bufs[i].buf == NULL)
3319                         continue;
3320                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3321                 bufs[i].buf = NULL;
3322         }
3323 }
3324
3325 static int alloc_dma_bufs(struct slgt_info *info)
3326 {
3327         info->rbuf_count = 32;
3328         info->tbuf_count = 32;
3329
3330         if (alloc_desc(info) < 0 ||
3331             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3332             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3333             alloc_tmp_rbuf(info) < 0) {
3334                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3335                 return -ENOMEM;
3336         }
3337         reset_rbufs(info);
3338         return 0;
3339 }
3340
3341 static void free_dma_bufs(struct slgt_info *info)
3342 {
3343         if (info->bufs) {
3344                 free_bufs(info, info->rbufs, info->rbuf_count);
3345                 free_bufs(info, info->tbufs, info->tbuf_count);
3346                 free_desc(info);
3347         }
3348         free_tmp_rbuf(info);
3349 }
3350
3351 static int claim_resources(struct slgt_info *info)
3352 {
3353         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3354                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3355                         info->device_name, info->phys_reg_addr));
3356                 info->init_error = DiagStatus_AddressConflict;
3357                 goto errout;
3358         }
3359         else
3360                 info->reg_addr_requested = true;
3361
3362         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3363         if (!info->reg_addr) {
3364                 DBGERR(("%s cant map device registers, addr=%08X\n",
3365                         info->device_name, info->phys_reg_addr));
3366                 info->init_error = DiagStatus_CantAssignPciResources;
3367                 goto errout;
3368         }
3369         return 0;
3370
3371 errout: