a85a60a93deb27358e7a7d7d9e6806c3bedacafe
[linux-2.6.git] / drivers / char / synclink_gt.c
1 /*
2  * $Id: synclink_gt.c,v 4.22 2006/01/09 20:16:06 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/config.h>
50 #include <linux/module.h>
51 #include <linux/version.h>
52 #include <linux/errno.h>
53 #include <linux/signal.h>
54 #include <linux/sched.h>
55 #include <linux/timer.h>
56 #include <linux/interrupt.h>
57 #include <linux/pci.h>
58 #include <linux/tty.h>
59 #include <linux/tty_flip.h>
60 #include <linux/serial.h>
61 #include <linux/major.h>
62 #include <linux/string.h>
63 #include <linux/fcntl.h>
64 #include <linux/ptrace.h>
65 #include <linux/ioport.h>
66 #include <linux/mm.h>
67 #include <linux/slab.h>
68 #include <linux/netdevice.h>
69 #include <linux/vmalloc.h>
70 #include <linux/init.h>
71 #include <linux/delay.h>
72 #include <linux/ioctl.h>
73 #include <linux/termios.h>
74 #include <linux/bitops.h>
75 #include <linux/workqueue.h>
76 #include <linux/hdlc.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 #include "linux/synclink.h"
86
87 #ifdef CONFIG_HDLC_MODULE
88 #define CONFIG_HDLC 1
89 #endif
90
91 /*
92  * module identification
93  */
94 static char *driver_name     = "SyncLink GT";
95 static char *driver_version  = "$Revision: 4.22 $";
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 12
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_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106         {0,}, /* terminate list */
107 };
108 MODULE_DEVICE_TABLE(pci, pci_table);
109
110 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
111 static void remove_one(struct pci_dev *dev);
112 static struct pci_driver pci_driver = {
113         .name           = "synclink_gt",
114         .id_table       = pci_table,
115         .probe          = init_one,
116         .remove         = __devexit_p(remove_one),
117 };
118
119 static int pci_registered;
120
121 /*
122  * module configuration and status
123  */
124 static struct slgt_info *slgt_device_list;
125 static int slgt_device_count;
126
127 static int ttymajor;
128 static int debug_level;
129 static int maxframe[MAX_DEVICES];
130 static int dosyncppp[MAX_DEVICES];
131
132 module_param(ttymajor, int, 0);
133 module_param(debug_level, int, 0);
134 module_param_array(maxframe, int, NULL, 0);
135 module_param_array(dosyncppp, int, NULL, 0);
136
137 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
138 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
139 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
140 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
141
142 /*
143  * tty support and callbacks
144  */
145 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
146
147 static struct tty_driver *serial_driver;
148
149 static int  open(struct tty_struct *tty, struct file * filp);
150 static void close(struct tty_struct *tty, struct file * filp);
151 static void hangup(struct tty_struct *tty);
152 static void set_termios(struct tty_struct *tty, struct termios *old_termios);
153
154 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
155 static void put_char(struct tty_struct *tty, unsigned char ch);
156 static void send_xchar(struct tty_struct *tty, char ch);
157 static void wait_until_sent(struct tty_struct *tty, int timeout);
158 static int  write_room(struct tty_struct *tty);
159 static void flush_chars(struct tty_struct *tty);
160 static void flush_buffer(struct tty_struct *tty);
161 static void tx_hold(struct tty_struct *tty);
162 static void tx_release(struct tty_struct *tty);
163
164 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
165 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
166 static int  chars_in_buffer(struct tty_struct *tty);
167 static void throttle(struct tty_struct * tty);
168 static void unthrottle(struct tty_struct * tty);
169 static void set_break(struct tty_struct *tty, int break_state);
170
171 /*
172  * generic HDLC support and callbacks
173  */
174 #ifdef CONFIG_HDLC
175 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
176 static void hdlcdev_tx_done(struct slgt_info *info);
177 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
178 static int  hdlcdev_init(struct slgt_info *info);
179 static void hdlcdev_exit(struct slgt_info *info);
180 #endif
181
182
183 /*
184  * device specific structures, macros and functions
185  */
186
187 #define SLGT_MAX_PORTS 4
188 #define SLGT_REG_SIZE  256
189
190 /*
191  * DMA buffer descriptor and access macros
192  */
193 struct slgt_desc
194 {
195         unsigned short count;
196         unsigned short status;
197         unsigned int pbuf;  /* physical address of data buffer */
198         unsigned int next;  /* physical address of next descriptor */
199
200         /* driver book keeping */
201         char *buf;          /* virtual  address of data buffer */
202         unsigned int pdesc; /* physical address of this descriptor */
203         dma_addr_t buf_dma_addr;
204 };
205
206 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
207 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
208 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
209 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
210 #define desc_count(a)      (le16_to_cpu((a).count))
211 #define desc_status(a)     (le16_to_cpu((a).status))
212 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
213 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
214 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
215 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
216 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
217
218 struct _input_signal_events {
219         int ri_up;
220         int ri_down;
221         int dsr_up;
222         int dsr_down;
223         int dcd_up;
224         int dcd_down;
225         int cts_up;
226         int cts_down;
227 };
228
229 /*
230  * device instance data structure
231  */
232 struct slgt_info {
233         void *if_ptr;           /* General purpose pointer (used by SPPP) */
234
235         struct slgt_info *next_device;  /* device list link */
236
237         int magic;
238         int flags;
239
240         char device_name[25];
241         struct pci_dev *pdev;
242
243         int port_count;  /* count of ports on adapter */
244         int adapter_num; /* adapter instance number */
245         int port_num;    /* port instance number */
246
247         /* array of pointers to port contexts on this adapter */
248         struct slgt_info *port_array[SLGT_MAX_PORTS];
249
250         int                     count;          /* count of opens */
251         int                     line;           /* tty line instance number */
252         unsigned short          close_delay;
253         unsigned short          closing_wait;   /* time to wait before closing */
254
255         struct mgsl_icount      icount;
256
257         struct tty_struct       *tty;
258         int                     timeout;
259         int                     x_char;         /* xon/xoff character */
260         int                     blocked_open;   /* # of blocked opens */
261         unsigned int            read_status_mask;
262         unsigned int            ignore_status_mask;
263
264         wait_queue_head_t       open_wait;
265         wait_queue_head_t       close_wait;
266
267         wait_queue_head_t       status_event_wait_q;
268         wait_queue_head_t       event_wait_q;
269         struct timer_list       tx_timer;
270         struct timer_list       rx_timer;
271
272         spinlock_t lock;        /* spinlock for synchronizing with ISR */
273
274         struct work_struct task;
275         u32 pending_bh;
276         int bh_requested;
277         int bh_running;
278
279         int isr_overflow;
280         int irq_requested;      /* nonzero if IRQ requested */
281         int irq_occurred;       /* for diagnostics use */
282
283         /* device configuration */
284
285         unsigned int bus_type;
286         unsigned int irq_level;
287         unsigned long irq_flags;
288
289         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
290         u32 phys_reg_addr;
291         int reg_addr_requested;
292
293         MGSL_PARAMS params;       /* communications parameters */
294         u32 idle_mode;
295         u32 max_frame_size;       /* as set by device config */
296
297         unsigned int raw_rx_size;
298         unsigned int if_mode;
299
300         /* device status */
301
302         int rx_enabled;
303         int rx_restart;
304
305         int tx_enabled;
306         int tx_active;
307
308         unsigned char signals;    /* serial signal states */
309         unsigned int init_error;  /* initialization error */
310
311         unsigned char *tx_buf;
312         int tx_count;
313
314         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
315         char char_buf[MAX_ASYNC_BUFFER_SIZE];
316         BOOLEAN drop_rts_on_tx_done;
317         struct  _input_signal_events    input_signal_events;
318
319         int dcd_chkcount;       /* check counts to prevent */
320         int cts_chkcount;       /* too many IRQs if a signal */
321         int dsr_chkcount;       /* is floating */
322         int ri_chkcount;
323
324         char *bufs;             /* virtual address of DMA buffer lists */
325         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
326
327         unsigned int rbuf_count;
328         struct slgt_desc *rbufs;
329         unsigned int rbuf_current;
330         unsigned int rbuf_index;
331
332         unsigned int tbuf_count;
333         struct slgt_desc *tbufs;
334         unsigned int tbuf_current;
335         unsigned int tbuf_start;
336
337         unsigned char *tmp_rbuf;
338         unsigned int tmp_rbuf_count;
339
340         /* SPPP/Cisco HDLC device parts */
341
342         int netcount;
343         int dosyncppp;
344         spinlock_t netlock;
345 #ifdef CONFIG_HDLC
346         struct net_device *netdev;
347 #endif
348
349 };
350
351 static MGSL_PARAMS default_params = {
352         .mode            = MGSL_MODE_HDLC,
353         .loopback        = 0,
354         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
355         .encoding        = HDLC_ENCODING_NRZI_SPACE,
356         .clock_speed     = 0,
357         .addr_filter     = 0xff,
358         .crc_type        = HDLC_CRC_16_CCITT,
359         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
360         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
361         .data_rate       = 9600,
362         .data_bits       = 8,
363         .stop_bits       = 1,
364         .parity          = ASYNC_PARITY_NONE
365 };
366
367
368 #define BH_RECEIVE  1
369 #define BH_TRANSMIT 2
370 #define BH_STATUS   4
371 #define IO_PIN_SHUTDOWN_LIMIT 100
372
373 #define DMABUFSIZE 256
374 #define DESC_LIST_SIZE 4096
375
376 #define MASK_PARITY  BIT1
377 #define MASK_FRAMING BIT2
378 #define MASK_BREAK   BIT3
379 #define MASK_OVERRUN BIT4
380
381 #define GSR   0x00 /* global status */
382 #define TDR   0x80 /* tx data */
383 #define RDR   0x80 /* rx data */
384 #define TCR   0x82 /* tx control */
385 #define TIR   0x84 /* tx idle */
386 #define TPR   0x85 /* tx preamble */
387 #define RCR   0x86 /* rx control */
388 #define VCR   0x88 /* V.24 control */
389 #define CCR   0x89 /* clock control */
390 #define BDR   0x8a /* baud divisor */
391 #define SCR   0x8c /* serial control */
392 #define SSR   0x8e /* serial status */
393 #define RDCSR 0x90 /* rx DMA control/status */
394 #define TDCSR 0x94 /* tx DMA control/status */
395 #define RDDAR 0x98 /* rx DMA descriptor address */
396 #define TDDAR 0x9c /* tx DMA descriptor address */
397
398 #define RXIDLE      BIT14
399 #define RXBREAK     BIT14
400 #define IRQ_TXDATA  BIT13
401 #define IRQ_TXIDLE  BIT12
402 #define IRQ_TXUNDER BIT11 /* HDLC */
403 #define IRQ_RXDATA  BIT10
404 #define IRQ_RXIDLE  BIT9  /* HDLC */
405 #define IRQ_RXBREAK BIT9  /* async */
406 #define IRQ_RXOVER  BIT8
407 #define IRQ_DSR     BIT7
408 #define IRQ_CTS     BIT6
409 #define IRQ_DCD     BIT5
410 #define IRQ_RI      BIT4
411 #define IRQ_ALL     0x3ff0
412 #define IRQ_MASTER  BIT0
413
414 #define slgt_irq_on(info, mask) \
415         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
416 #define slgt_irq_off(info, mask) \
417         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
418
419 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
420 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
421 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
422 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
423 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
424 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
425
426 static void  msc_set_vcr(struct slgt_info *info);
427
428 static int  startup(struct slgt_info *info);
429 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
430 static void shutdown(struct slgt_info *info);
431 static void program_hw(struct slgt_info *info);
432 static void change_params(struct slgt_info *info);
433
434 static int  register_test(struct slgt_info *info);
435 static int  irq_test(struct slgt_info *info);
436 static int  loopback_test(struct slgt_info *info);
437 static int  adapter_test(struct slgt_info *info);
438
439 static void reset_adapter(struct slgt_info *info);
440 static void reset_port(struct slgt_info *info);
441 static void async_mode(struct slgt_info *info);
442 static void hdlc_mode(struct slgt_info *info);
443
444 static void rx_stop(struct slgt_info *info);
445 static void rx_start(struct slgt_info *info);
446 static void reset_rbufs(struct slgt_info *info);
447 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
448 static void rdma_reset(struct slgt_info *info);
449 static int  rx_get_frame(struct slgt_info *info);
450 static int  rx_get_buf(struct slgt_info *info);
451
452 static void tx_start(struct slgt_info *info);
453 static void tx_stop(struct slgt_info *info);
454 static void tx_set_idle(struct slgt_info *info);
455 static unsigned int free_tbuf_count(struct slgt_info *info);
456 static void reset_tbufs(struct slgt_info *info);
457 static void tdma_reset(struct slgt_info *info);
458 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
459
460 static void get_signals(struct slgt_info *info);
461 static void set_signals(struct slgt_info *info);
462 static void enable_loopback(struct slgt_info *info);
463 static void set_rate(struct slgt_info *info, u32 data_rate);
464
465 static int  bh_action(struct slgt_info *info);
466 static void bh_handler(void* context);
467 static void bh_transmit(struct slgt_info *info);
468 static void isr_serial(struct slgt_info *info);
469 static void isr_rdma(struct slgt_info *info);
470 static void isr_txeom(struct slgt_info *info, unsigned short status);
471 static void isr_tdma(struct slgt_info *info);
472 static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs);
473
474 static int  alloc_dma_bufs(struct slgt_info *info);
475 static void free_dma_bufs(struct slgt_info *info);
476 static int  alloc_desc(struct slgt_info *info);
477 static void free_desc(struct slgt_info *info);
478 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
479 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
480
481 static int  alloc_tmp_rbuf(struct slgt_info *info);
482 static void free_tmp_rbuf(struct slgt_info *info);
483
484 static void tx_timeout(unsigned long context);
485 static void rx_timeout(unsigned long context);
486
487 /*
488  * ioctl handlers
489  */
490 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
491 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
492 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
493 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
494 static int  set_txidle(struct slgt_info *info, int idle_mode);
495 static int  tx_enable(struct slgt_info *info, int enable);
496 static int  tx_abort(struct slgt_info *info);
497 static int  rx_enable(struct slgt_info *info, int enable);
498 static int  modem_input_wait(struct slgt_info *info,int arg);
499 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
500 static int  tiocmget(struct tty_struct *tty, struct file *file);
501 static int  tiocmset(struct tty_struct *tty, struct file *file,
502                      unsigned int set, unsigned int clear);
503 static void set_break(struct tty_struct *tty, int break_state);
504 static int  get_interface(struct slgt_info *info, int __user *if_mode);
505 static int  set_interface(struct slgt_info *info, int if_mode);
506
507 /*
508  * driver functions
509  */
510 static void add_device(struct slgt_info *info);
511 static void device_init(int adapter_num, struct pci_dev *pdev);
512 static int  claim_resources(struct slgt_info *info);
513 static void release_resources(struct slgt_info *info);
514
515 /*
516  * DEBUG OUTPUT CODE
517  */
518 #ifndef DBGINFO
519 #define DBGINFO(fmt)
520 #endif
521 #ifndef DBGERR
522 #define DBGERR(fmt)
523 #endif
524 #ifndef DBGBH
525 #define DBGBH(fmt)
526 #endif
527 #ifndef DBGISR
528 #define DBGISR(fmt)
529 #endif
530
531 #ifdef DBGDATA
532 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
533 {
534         int i;
535         int linecount;
536         printk("%s %s data:\n",info->device_name, label);
537         while(count) {
538                 linecount = (count > 16) ? 16 : count;
539                 for(i=0; i < linecount; i++)
540                         printk("%02X ",(unsigned char)data[i]);
541                 for(;i<17;i++)
542                         printk("   ");
543                 for(i=0;i<linecount;i++) {
544                         if (data[i]>=040 && data[i]<=0176)
545                                 printk("%c",data[i]);
546                         else
547                                 printk(".");
548                 }
549                 printk("\n");
550                 data  += linecount;
551                 count -= linecount;
552         }
553 }
554 #else
555 #define DBGDATA(info, buf, size, label)
556 #endif
557
558 #ifdef DBGTBUF
559 static void dump_tbufs(struct slgt_info *info)
560 {
561         int i;
562         printk("tbuf_current=%d\n", info->tbuf_current);
563         for (i=0 ; i < info->tbuf_count ; i++) {
564                 printk("%d: count=%04X status=%04X\n",
565                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
566         }
567 }
568 #else
569 #define DBGTBUF(info)
570 #endif
571
572 #ifdef DBGRBUF
573 static void dump_rbufs(struct slgt_info *info)
574 {
575         int i;
576         printk("rbuf_current=%d\n", info->rbuf_current);
577         for (i=0 ; i < info->rbuf_count ; i++) {
578                 printk("%d: count=%04X status=%04X\n",
579                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
580         }
581 }
582 #else
583 #define DBGRBUF(info)
584 #endif
585
586 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
587 {
588 #ifdef SANITY_CHECK
589         if (!info) {
590                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
591                 return 1;
592         }
593         if (info->magic != MGSL_MAGIC) {
594                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
595                 return 1;
596         }
597 #else
598         if (!info)
599                 return 1;
600 #endif
601         return 0;
602 }
603
604 /**
605  * line discipline callback wrappers
606  *
607  * The wrappers maintain line discipline references
608  * while calling into the line discipline.
609  *
610  * ldisc_receive_buf  - pass receive data to line discipline
611  */
612 static void ldisc_receive_buf(struct tty_struct *tty,
613                               const __u8 *data, char *flags, int count)
614 {
615         struct tty_ldisc *ld;
616         if (!tty)
617                 return;
618         ld = tty_ldisc_ref(tty);
619         if (ld) {
620                 if (ld->receive_buf)
621                         ld->receive_buf(tty, data, flags, count);
622                 tty_ldisc_deref(ld);
623         }
624 }
625
626 /* tty callbacks */
627
628 static int open(struct tty_struct *tty, struct file *filp)
629 {
630         struct slgt_info *info;
631         int retval, line;
632         unsigned long flags;
633
634         line = tty->index;
635         if ((line < 0) || (line >= slgt_device_count)) {
636                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
637                 return -ENODEV;
638         }
639
640         info = slgt_device_list;
641         while(info && info->line != line)
642                 info = info->next_device;
643         if (sanity_check(info, tty->name, "open"))
644                 return -ENODEV;
645         if (info->init_error) {
646                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
647                 return -ENODEV;
648         }
649
650         tty->driver_data = info;
651         info->tty = tty;
652
653         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
654
655         /* If port is closing, signal caller to try again */
656         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
657                 if (info->flags & ASYNC_CLOSING)
658                         interruptible_sleep_on(&info->close_wait);
659                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
660                         -EAGAIN : -ERESTARTSYS);
661                 goto cleanup;
662         }
663
664         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
665
666         spin_lock_irqsave(&info->netlock, flags);
667         if (info->netcount) {
668                 retval = -EBUSY;
669                 spin_unlock_irqrestore(&info->netlock, flags);
670                 goto cleanup;
671         }
672         info->count++;
673         spin_unlock_irqrestore(&info->netlock, flags);
674
675         if (info->count == 1) {
676                 /* 1st open on this device, init hardware */
677                 retval = startup(info);
678                 if (retval < 0)
679                         goto cleanup;
680         }
681
682         retval = block_til_ready(tty, filp, info);
683         if (retval) {
684                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
685                 goto cleanup;
686         }
687
688         retval = 0;
689
690 cleanup:
691         if (retval) {
692                 if (tty->count == 1)
693                         info->tty = NULL; /* tty layer will release tty struct */
694                 if(info->count)
695                         info->count--;
696         }
697
698         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
699         return retval;
700 }
701
702 static void close(struct tty_struct *tty, struct file *filp)
703 {
704         struct slgt_info *info = tty->driver_data;
705
706         if (sanity_check(info, tty->name, "close"))
707                 return;
708         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
709
710         if (!info->count)
711                 return;
712
713         if (tty_hung_up_p(filp))
714                 goto cleanup;
715
716         if ((tty->count == 1) && (info->count != 1)) {
717                 /*
718                  * tty->count is 1 and the tty structure will be freed.
719                  * info->count should be one in this case.
720                  * if it's not, correct it so that the port is shutdown.
721                  */
722                 DBGERR(("%s close: bad refcount; tty->count=1, "
723                        "info->count=%d\n", info->device_name, info->count));
724                 info->count = 1;
725         }
726
727         info->count--;
728
729         /* if at least one open remaining, leave hardware active */
730         if (info->count)
731                 goto cleanup;
732
733         info->flags |= ASYNC_CLOSING;
734
735         /* set tty->closing to notify line discipline to
736          * only process XON/XOFF characters. Only the N_TTY
737          * discipline appears to use this (ppp does not).
738          */
739         tty->closing = 1;
740
741         /* wait for transmit data to clear all layers */
742
743         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
744                 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
745                 tty_wait_until_sent(tty, info->closing_wait);
746         }
747
748         if (info->flags & ASYNC_INITIALIZED)
749                 wait_until_sent(tty, info->timeout);
750         if (tty->driver->flush_buffer)
751                 tty->driver->flush_buffer(tty);
752         tty_ldisc_flush(tty);
753
754         shutdown(info);
755
756         tty->closing = 0;
757         info->tty = NULL;
758
759         if (info->blocked_open) {
760                 if (info->close_delay) {
761                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
762                 }
763                 wake_up_interruptible(&info->open_wait);
764         }
765
766         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
767
768         wake_up_interruptible(&info->close_wait);
769
770 cleanup:
771         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
772 }
773
774 static void hangup(struct tty_struct *tty)
775 {
776         struct slgt_info *info = tty->driver_data;
777
778         if (sanity_check(info, tty->name, "hangup"))
779                 return;
780         DBGINFO(("%s hangup\n", info->device_name));
781
782         flush_buffer(tty);
783         shutdown(info);
784
785         info->count = 0;
786         info->flags &= ~ASYNC_NORMAL_ACTIVE;
787         info->tty = NULL;
788
789         wake_up_interruptible(&info->open_wait);
790 }
791
792 static void set_termios(struct tty_struct *tty, struct termios *old_termios)
793 {
794         struct slgt_info *info = tty->driver_data;
795         unsigned long flags;
796
797         DBGINFO(("%s set_termios\n", tty->driver->name));
798
799         /* just return if nothing has changed */
800         if ((tty->termios->c_cflag == old_termios->c_cflag)
801             && (RELEVANT_IFLAG(tty->termios->c_iflag)
802                 == RELEVANT_IFLAG(old_termios->c_iflag)))
803                 return;
804
805         change_params(info);
806
807         /* Handle transition to B0 status */
808         if (old_termios->c_cflag & CBAUD &&
809             !(tty->termios->c_cflag & CBAUD)) {
810                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
811                 spin_lock_irqsave(&info->lock,flags);
812                 set_signals(info);
813                 spin_unlock_irqrestore(&info->lock,flags);
814         }
815
816         /* Handle transition away from B0 status */
817         if (!(old_termios->c_cflag & CBAUD) &&
818             tty->termios->c_cflag & CBAUD) {
819                 info->signals |= SerialSignal_DTR;
820                 if (!(tty->termios->c_cflag & CRTSCTS) ||
821                     !test_bit(TTY_THROTTLED, &tty->flags)) {
822                         info->signals |= SerialSignal_RTS;
823                 }
824                 spin_lock_irqsave(&info->lock,flags);
825                 set_signals(info);
826                 spin_unlock_irqrestore(&info->lock,flags);
827         }
828
829         /* Handle turning off CRTSCTS */
830         if (old_termios->c_cflag & CRTSCTS &&
831             !(tty->termios->c_cflag & CRTSCTS)) {
832                 tty->hw_stopped = 0;
833                 tx_release(tty);
834         }
835 }
836
837 static int write(struct tty_struct *tty,
838                  const unsigned char *buf, int count)
839 {
840         int ret = 0;
841         struct slgt_info *info = tty->driver_data;
842         unsigned long flags;
843
844         if (sanity_check(info, tty->name, "write"))
845                 goto cleanup;
846         DBGINFO(("%s write count=%d\n", info->device_name, count));
847
848         if (!tty || !info->tx_buf)
849                 goto cleanup;
850
851         if (count > info->max_frame_size) {
852                 ret = -EIO;
853                 goto cleanup;
854         }
855
856         if (!count)
857                 goto cleanup;
858
859         if (info->params.mode == MGSL_MODE_RAW) {
860                 unsigned int bufs_needed = (count/DMABUFSIZE);
861                 unsigned int bufs_free = free_tbuf_count(info);
862                 if (count % DMABUFSIZE)
863                         ++bufs_needed;
864                 if (bufs_needed > bufs_free)
865                         goto cleanup;
866         } else {
867                 if (info->tx_active)
868                         goto cleanup;
869                 if (info->tx_count) {
870                         /* send accumulated data from send_char() calls */
871                         /* as frame and wait before accepting more data. */
872                         tx_load(info, info->tx_buf, info->tx_count);
873                         goto start;
874                 }
875         }
876
877         ret = info->tx_count = count;
878         tx_load(info, buf, count);
879         goto start;
880
881 start:
882         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
883                 spin_lock_irqsave(&info->lock,flags);
884                 if (!info->tx_active)
885                         tx_start(info);
886                 spin_unlock_irqrestore(&info->lock,flags);
887         }
888
889 cleanup:
890         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
891         return ret;
892 }
893
894 static void put_char(struct tty_struct *tty, unsigned char ch)
895 {
896         struct slgt_info *info = tty->driver_data;
897         unsigned long flags;
898
899         if (sanity_check(info, tty->name, "put_char"))
900                 return;
901         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
902         if (!tty || !info->tx_buf)
903                 return;
904         spin_lock_irqsave(&info->lock,flags);
905         if (!info->tx_active && (info->tx_count < info->max_frame_size))
906                 info->tx_buf[info->tx_count++] = ch;
907         spin_unlock_irqrestore(&info->lock,flags);
908 }
909
910 static void send_xchar(struct tty_struct *tty, char ch)
911 {
912         struct slgt_info *info = tty->driver_data;
913         unsigned long flags;
914
915         if (sanity_check(info, tty->name, "send_xchar"))
916                 return;
917         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
918         info->x_char = ch;
919         if (ch) {
920                 spin_lock_irqsave(&info->lock,flags);
921                 if (!info->tx_enabled)
922                         tx_start(info);
923                 spin_unlock_irqrestore(&info->lock,flags);
924         }
925 }
926
927 static void wait_until_sent(struct tty_struct *tty, int timeout)
928 {
929         struct slgt_info *info = tty->driver_data;
930         unsigned long orig_jiffies, char_time;
931
932         if (!info )
933                 return;
934         if (sanity_check(info, tty->name, "wait_until_sent"))
935                 return;
936         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
937         if (!(info->flags & ASYNC_INITIALIZED))
938                 goto exit;
939
940         orig_jiffies = jiffies;
941
942         /* Set check interval to 1/5 of estimated time to
943          * send a character, and make it at least 1. The check
944          * interval should also be less than the timeout.
945          * Note: use tight timings here to satisfy the NIST-PCTS.
946          */
947
948         if (info->params.data_rate) {
949                 char_time = info->timeout/(32 * 5);
950                 if (!char_time)
951                         char_time++;
952         } else
953                 char_time = 1;
954
955         if (timeout)
956                 char_time = min_t(unsigned long, char_time, timeout);
957
958         while (info->tx_active) {
959                 msleep_interruptible(jiffies_to_msecs(char_time));
960                 if (signal_pending(current))
961                         break;
962                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
963                         break;
964         }
965
966 exit:
967         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
968 }
969
970 static int write_room(struct tty_struct *tty)
971 {
972         struct slgt_info *info = tty->driver_data;
973         int ret;
974
975         if (sanity_check(info, tty->name, "write_room"))
976                 return 0;
977         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
978         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
979         return ret;
980 }
981
982 static void flush_chars(struct tty_struct *tty)
983 {
984         struct slgt_info *info = tty->driver_data;
985         unsigned long flags;
986
987         if (sanity_check(info, tty->name, "flush_chars"))
988                 return;
989         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
990
991         if (info->tx_count <= 0 || tty->stopped ||
992             tty->hw_stopped || !info->tx_buf)
993                 return;
994
995         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
996
997         spin_lock_irqsave(&info->lock,flags);
998         if (!info->tx_active && info->tx_count) {
999                 tx_load(info, info->tx_buf,info->tx_count);
1000                 tx_start(info);
1001         }
1002         spin_unlock_irqrestore(&info->lock,flags);
1003 }
1004
1005 static void flush_buffer(struct tty_struct *tty)
1006 {
1007         struct slgt_info *info = tty->driver_data;
1008         unsigned long flags;
1009
1010         if (sanity_check(info, tty->name, "flush_buffer"))
1011                 return;
1012         DBGINFO(("%s flush_buffer\n", info->device_name));
1013
1014         spin_lock_irqsave(&info->lock,flags);
1015         if (!info->tx_active)
1016                 info->tx_count = 0;
1017         spin_unlock_irqrestore(&info->lock,flags);
1018
1019         wake_up_interruptible(&tty->write_wait);
1020         tty_wakeup(tty);
1021 }
1022
1023 /*
1024  * throttle (stop) transmitter
1025  */
1026 static void tx_hold(struct tty_struct *tty)
1027 {
1028         struct slgt_info *info = tty->driver_data;
1029         unsigned long flags;
1030
1031         if (sanity_check(info, tty->name, "tx_hold"))
1032                 return;
1033         DBGINFO(("%s tx_hold\n", info->device_name));
1034         spin_lock_irqsave(&info->lock,flags);
1035         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1036                 tx_stop(info);
1037         spin_unlock_irqrestore(&info->lock,flags);
1038 }
1039
1040 /*
1041  * release (start) transmitter
1042  */
1043 static void tx_release(struct tty_struct *tty)
1044 {
1045         struct slgt_info *info = tty->driver_data;
1046         unsigned long flags;
1047
1048         if (sanity_check(info, tty->name, "tx_release"))
1049                 return;
1050         DBGINFO(("%s tx_release\n", info->device_name));
1051         spin_lock_irqsave(&info->lock,flags);
1052         if (!info->tx_active && info->tx_count) {
1053                 tx_load(info, info->tx_buf, info->tx_count);
1054                 tx_start(info);
1055         }
1056         spin_unlock_irqrestore(&info->lock,flags);
1057 }
1058
1059 /*
1060  * Service an IOCTL request
1061  *
1062  * Arguments
1063  *
1064  *      tty     pointer to tty instance data
1065  *      file    pointer to associated file object for device
1066  *      cmd     IOCTL command code
1067  *      arg     command argument/context
1068  *
1069  * Return 0 if success, otherwise error code
1070  */
1071 static int ioctl(struct tty_struct *tty, struct file *file,
1072                  unsigned int cmd, unsigned long arg)
1073 {
1074         struct slgt_info *info = tty->driver_data;
1075         struct mgsl_icount cnow;        /* kernel counter temps */
1076         struct serial_icounter_struct __user *p_cuser;  /* user space */
1077         unsigned long flags;
1078         void __user *argp = (void __user *)arg;
1079
1080         if (sanity_check(info, tty->name, "ioctl"))
1081                 return -ENODEV;
1082         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1083
1084         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1085             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1086                 if (tty->flags & (1 << TTY_IO_ERROR))
1087                     return -EIO;
1088         }
1089
1090         switch (cmd) {
1091         case MGSL_IOCGPARAMS:
1092                 return get_params(info, argp);
1093         case MGSL_IOCSPARAMS:
1094                 return set_params(info, argp);
1095         case MGSL_IOCGTXIDLE:
1096                 return get_txidle(info, argp);
1097         case MGSL_IOCSTXIDLE:
1098                 return set_txidle(info, (int)arg);
1099         case MGSL_IOCTXENABLE:
1100                 return tx_enable(info, (int)arg);
1101         case MGSL_IOCRXENABLE:
1102                 return rx_enable(info, (int)arg);
1103         case MGSL_IOCTXABORT:
1104                 return tx_abort(info);
1105         case MGSL_IOCGSTATS:
1106                 return get_stats(info, argp);
1107         case MGSL_IOCWAITEVENT:
1108                 return wait_mgsl_event(info, argp);
1109         case TIOCMIWAIT:
1110                 return modem_input_wait(info,(int)arg);
1111         case MGSL_IOCGIF:
1112                 return get_interface(info, argp);
1113         case MGSL_IOCSIF:
1114                 return set_interface(info,(int)arg);
1115         case TIOCGICOUNT:
1116                 spin_lock_irqsave(&info->lock,flags);
1117                 cnow = info->icount;
1118                 spin_unlock_irqrestore(&info->lock,flags);
1119                 p_cuser = argp;
1120                 if (put_user(cnow.cts, &p_cuser->cts) ||
1121                     put_user(cnow.dsr, &p_cuser->dsr) ||
1122                     put_user(cnow.rng, &p_cuser->rng) ||
1123                     put_user(cnow.dcd, &p_cuser->dcd) ||
1124                     put_user(cnow.rx, &p_cuser->rx) ||
1125                     put_user(cnow.tx, &p_cuser->tx) ||
1126                     put_user(cnow.frame, &p_cuser->frame) ||
1127                     put_user(cnow.overrun, &p_cuser->overrun) ||
1128                     put_user(cnow.parity, &p_cuser->parity) ||
1129                     put_user(cnow.brk, &p_cuser->brk) ||
1130                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1131                         return -EFAULT;
1132                 return 0;
1133         default:
1134                 return -ENOIOCTLCMD;
1135         }
1136         return 0;
1137 }
1138
1139 /*
1140  * proc fs support
1141  */
1142 static inline int line_info(char *buf, struct slgt_info *info)
1143 {
1144         char stat_buf[30];
1145         int ret;
1146         unsigned long flags;
1147
1148         ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1149                       info->device_name, info->phys_reg_addr,
1150                       info->irq_level, info->max_frame_size);
1151
1152         /* output current serial signal states */
1153         spin_lock_irqsave(&info->lock,flags);
1154         get_signals(info);
1155         spin_unlock_irqrestore(&info->lock,flags);
1156
1157         stat_buf[0] = 0;
1158         stat_buf[1] = 0;
1159         if (info->signals & SerialSignal_RTS)
1160                 strcat(stat_buf, "|RTS");
1161         if (info->signals & SerialSignal_CTS)
1162                 strcat(stat_buf, "|CTS");
1163         if (info->signals & SerialSignal_DTR)
1164                 strcat(stat_buf, "|DTR");
1165         if (info->signals & SerialSignal_DSR)
1166                 strcat(stat_buf, "|DSR");
1167         if (info->signals & SerialSignal_DCD)
1168                 strcat(stat_buf, "|CD");
1169         if (info->signals & SerialSignal_RI)
1170                 strcat(stat_buf, "|RI");
1171
1172         if (info->params.mode != MGSL_MODE_ASYNC) {
1173                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1174                                info->icount.txok, info->icount.rxok);
1175                 if (info->icount.txunder)
1176                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1177                 if (info->icount.txabort)
1178                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1179                 if (info->icount.rxshort)
1180                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1181                 if (info->icount.rxlong)
1182                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1183                 if (info->icount.rxover)
1184                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1185                 if (info->icount.rxcrc)
1186                         ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1187         } else {
1188                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1189                                info->icount.tx, info->icount.rx);
1190                 if (info->icount.frame)
1191                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1192                 if (info->icount.parity)
1193                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1194                 if (info->icount.brk)
1195                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1196                 if (info->icount.overrun)
1197                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1198         }
1199
1200         /* Append serial signal status to end */
1201         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1202
1203         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1204                        info->tx_active,info->bh_requested,info->bh_running,
1205                        info->pending_bh);
1206
1207         return ret;
1208 }
1209
1210 /* Called to print information about devices
1211  */
1212 static int read_proc(char *page, char **start, off_t off, int count,
1213                      int *eof, void *data)
1214 {
1215         int len = 0, l;
1216         off_t   begin = 0;
1217         struct slgt_info *info;
1218
1219         len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1220
1221         info = slgt_device_list;
1222         while( info ) {
1223                 l = line_info(page + len, info);
1224                 len += l;
1225                 if (len+begin > off+count)
1226                         goto done;
1227                 if (len+begin < off) {
1228                         begin += len;
1229                         len = 0;
1230                 }
1231                 info = info->next_device;
1232         }
1233
1234         *eof = 1;
1235 done:
1236         if (off >= len+begin)
1237                 return 0;
1238         *start = page + (off-begin);
1239         return ((count < begin+len-off) ? count : begin+len-off);
1240 }
1241
1242 /*
1243  * return count of bytes in transmit buffer
1244  */
1245 static int chars_in_buffer(struct tty_struct *tty)
1246 {
1247         struct slgt_info *info = tty->driver_data;
1248         if (sanity_check(info, tty->name, "chars_in_buffer"))
1249                 return 0;
1250         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1251         return info->tx_count;
1252 }
1253
1254 /*
1255  * signal remote device to throttle send data (our receive data)
1256  */
1257 static void throttle(struct tty_struct * tty)
1258 {
1259         struct slgt_info *info = tty->driver_data;
1260         unsigned long flags;
1261
1262         if (sanity_check(info, tty->name, "throttle"))
1263                 return;
1264         DBGINFO(("%s throttle\n", info->device_name));
1265         if (I_IXOFF(tty))
1266                 send_xchar(tty, STOP_CHAR(tty));
1267         if (tty->termios->c_cflag & CRTSCTS) {
1268                 spin_lock_irqsave(&info->lock,flags);
1269                 info->signals &= ~SerialSignal_RTS;
1270                 set_signals(info);
1271                 spin_unlock_irqrestore(&info->lock,flags);
1272         }
1273 }
1274
1275 /*
1276  * signal remote device to stop throttling send data (our receive data)
1277  */
1278 static void unthrottle(struct tty_struct * tty)
1279 {
1280         struct slgt_info *info = tty->driver_data;
1281         unsigned long flags;
1282
1283         if (sanity_check(info, tty->name, "unthrottle"))
1284                 return;
1285         DBGINFO(("%s unthrottle\n", info->device_name));
1286         if (I_IXOFF(tty)) {
1287                 if (info->x_char)
1288                         info->x_char = 0;
1289                 else
1290                         send_xchar(tty, START_CHAR(tty));
1291         }
1292         if (tty->termios->c_cflag & CRTSCTS) {
1293                 spin_lock_irqsave(&info->lock,flags);
1294                 info->signals |= SerialSignal_RTS;
1295                 set_signals(info);
1296                 spin_unlock_irqrestore(&info->lock,flags);
1297         }
1298 }
1299
1300 /*
1301  * set or clear transmit break condition
1302  * break_state  -1=set break condition, 0=clear
1303  */
1304 static void set_break(struct tty_struct *tty, int break_state)
1305 {
1306         struct slgt_info *info = tty->driver_data;
1307         unsigned short value;
1308         unsigned long flags;
1309
1310         if (sanity_check(info, tty->name, "set_break"))
1311                 return;
1312         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1313
1314         spin_lock_irqsave(&info->lock,flags);
1315         value = rd_reg16(info, TCR);
1316         if (break_state == -1)
1317                 value |= BIT6;
1318         else
1319                 value &= ~BIT6;
1320         wr_reg16(info, TCR, value);
1321         spin_unlock_irqrestore(&info->lock,flags);
1322 }
1323
1324 #ifdef CONFIG_HDLC
1325
1326 /**
1327  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1328  * set encoding and frame check sequence (FCS) options
1329  *
1330  * dev       pointer to network device structure
1331  * encoding  serial encoding setting
1332  * parity    FCS setting
1333  *
1334  * returns 0 if success, otherwise error code
1335  */
1336 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1337                           unsigned short parity)
1338 {
1339         struct slgt_info *info = dev_to_port(dev);
1340         unsigned char  new_encoding;
1341         unsigned short new_crctype;
1342
1343         /* return error if TTY interface open */
1344         if (info->count)
1345                 return -EBUSY;
1346
1347         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1348
1349         switch (encoding)
1350         {
1351         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1352         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1353         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1354         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1355         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1356         default: return -EINVAL;
1357         }
1358
1359         switch (parity)
1360         {
1361         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1362         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1363         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1364         default: return -EINVAL;
1365         }
1366
1367         info->params.encoding = new_encoding;
1368         info->params.crc_type = new_crctype;;
1369
1370         /* if network interface up, reprogram hardware */
1371         if (info->netcount)
1372                 program_hw(info);
1373
1374         return 0;
1375 }
1376
1377 /**
1378  * called by generic HDLC layer to send frame
1379  *
1380  * skb  socket buffer containing HDLC frame
1381  * dev  pointer to network device structure
1382  *
1383  * returns 0 if success, otherwise error code
1384  */
1385 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1386 {
1387         struct slgt_info *info = dev_to_port(dev);
1388         struct net_device_stats *stats = hdlc_stats(dev);
1389         unsigned long flags;
1390
1391         DBGINFO(("%s hdlc_xmit\n", dev->name));
1392
1393         /* stop sending until this frame completes */
1394         netif_stop_queue(dev);
1395
1396         /* copy data to device buffers */
1397         info->tx_count = skb->len;
1398         tx_load(info, skb->data, skb->len);
1399
1400         /* update network statistics */
1401         stats->tx_packets++;
1402         stats->tx_bytes += skb->len;
1403
1404         /* done with socket buffer, so free it */
1405         dev_kfree_skb(skb);
1406
1407         /* save start time for transmit timeout detection */
1408         dev->trans_start = jiffies;
1409
1410         /* start hardware transmitter if necessary */
1411         spin_lock_irqsave(&info->lock,flags);
1412         if (!info->tx_active)
1413                 tx_start(info);
1414         spin_unlock_irqrestore(&info->lock,flags);
1415
1416         return 0;
1417 }
1418
1419 /**
1420  * called by network layer when interface enabled
1421  * claim resources and initialize hardware
1422  *
1423  * dev  pointer to network device structure
1424  *
1425  * returns 0 if success, otherwise error code
1426  */
1427 static int hdlcdev_open(struct net_device *dev)
1428 {
1429         struct slgt_info *info = dev_to_port(dev);
1430         int rc;
1431         unsigned long flags;
1432
1433         DBGINFO(("%s hdlcdev_open\n", dev->name));
1434
1435         /* generic HDLC layer open processing */
1436         if ((rc = hdlc_open(dev)))
1437                 return rc;
1438
1439         /* arbitrate between network and tty opens */
1440         spin_lock_irqsave(&info->netlock, flags);
1441         if (info->count != 0 || info->netcount != 0) {
1442                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1443                 spin_unlock_irqrestore(&info->netlock, flags);
1444                 return -EBUSY;
1445         }
1446         info->netcount=1;
1447         spin_unlock_irqrestore(&info->netlock, flags);
1448
1449         /* claim resources and init adapter */
1450         if ((rc = startup(info)) != 0) {
1451                 spin_lock_irqsave(&info->netlock, flags);
1452                 info->netcount=0;
1453                 spin_unlock_irqrestore(&info->netlock, flags);
1454                 return rc;
1455         }
1456
1457         /* assert DTR and RTS, apply hardware settings */
1458         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1459         program_hw(info);
1460
1461         /* enable network layer transmit */
1462         dev->trans_start = jiffies;
1463         netif_start_queue(dev);
1464
1465         /* inform generic HDLC layer of current DCD status */
1466         spin_lock_irqsave(&info->lock, flags);
1467         get_signals(info);
1468         spin_unlock_irqrestore(&info->lock, flags);
1469         hdlc_set_carrier(info->signals & SerialSignal_DCD, dev);
1470
1471         return 0;
1472 }
1473
1474 /**
1475  * called by network layer when interface is disabled
1476  * shutdown hardware and release resources
1477  *
1478  * dev  pointer to network device structure
1479  *
1480  * returns 0 if success, otherwise error code
1481  */
1482 static int hdlcdev_close(struct net_device *dev)
1483 {
1484         struct slgt_info *info = dev_to_port(dev);
1485         unsigned long flags;
1486
1487         DBGINFO(("%s hdlcdev_close\n", dev->name));
1488
1489         netif_stop_queue(dev);
1490
1491         /* shutdown adapter and release resources */
1492         shutdown(info);
1493
1494         hdlc_close(dev);
1495
1496         spin_lock_irqsave(&info->netlock, flags);
1497         info->netcount=0;
1498         spin_unlock_irqrestore(&info->netlock, flags);
1499
1500         return 0;
1501 }
1502
1503 /**
1504  * called by network layer to process IOCTL call to network device
1505  *
1506  * dev  pointer to network device structure
1507  * ifr  pointer to network interface request structure
1508  * cmd  IOCTL command code
1509  *
1510  * returns 0 if success, otherwise error code
1511  */
1512 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1513 {
1514         const size_t size = sizeof(sync_serial_settings);
1515         sync_serial_settings new_line;
1516         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1517         struct slgt_info *info = dev_to_port(dev);
1518         unsigned int flags;
1519
1520         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1521
1522         /* return error if TTY interface open */
1523         if (info->count)
1524                 return -EBUSY;
1525
1526         if (cmd != SIOCWANDEV)
1527                 return hdlc_ioctl(dev, ifr, cmd);
1528
1529         switch(ifr->ifr_settings.type) {
1530         case IF_GET_IFACE: /* return current sync_serial_settings */
1531
1532                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1533                 if (ifr->ifr_settings.size < size) {
1534                         ifr->ifr_settings.size = size; /* data size wanted */
1535                         return -ENOBUFS;
1536                 }
1537
1538                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1539                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1540                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1541                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1542
1543                 switch (flags){
1544                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1545                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1546                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1547                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1548                 default: new_line.clock_type = CLOCK_DEFAULT;
1549                 }
1550
1551                 new_line.clock_rate = info->params.clock_speed;
1552                 new_line.loopback   = info->params.loopback ? 1:0;
1553
1554                 if (copy_to_user(line, &new_line, size))
1555                         return -EFAULT;
1556                 return 0;
1557
1558         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1559
1560                 if(!capable(CAP_NET_ADMIN))
1561                         return -EPERM;
1562                 if (copy_from_user(&new_line, line, size))
1563                         return -EFAULT;
1564
1565                 switch (new_line.clock_type)
1566                 {
1567                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1568                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1569                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1570                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1571                 case CLOCK_DEFAULT:  flags = info->params.flags &
1572                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1573                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1574                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1575                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1576                 default: return -EINVAL;
1577                 }
1578
1579                 if (new_line.loopback != 0 && new_line.loopback != 1)
1580                         return -EINVAL;
1581
1582                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1583                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1584                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1585                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1586                 info->params.flags |= flags;
1587
1588                 info->params.loopback = new_line.loopback;
1589
1590                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1591                         info->params.clock_speed = new_line.clock_rate;
1592                 else
1593                         info->params.clock_speed = 0;
1594
1595                 /* if network interface up, reprogram hardware */
1596                 if (info->netcount)
1597                         program_hw(info);
1598                 return 0;
1599
1600         default:
1601                 return hdlc_ioctl(dev, ifr, cmd);
1602         }
1603 }
1604
1605 /**
1606  * called by network layer when transmit timeout is detected
1607  *
1608  * dev  pointer to network device structure
1609  */
1610 static void hdlcdev_tx_timeout(struct net_device *dev)
1611 {
1612         struct slgt_info *info = dev_to_port(dev);
1613         struct net_device_stats *stats = hdlc_stats(dev);
1614         unsigned long flags;
1615
1616         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1617
1618         stats->tx_errors++;
1619         stats->tx_aborted_errors++;
1620
1621         spin_lock_irqsave(&info->lock,flags);
1622         tx_stop(info);
1623         spin_unlock_irqrestore(&info->lock,flags);
1624
1625         netif_wake_queue(dev);
1626 }
1627
1628 /**
1629  * called by device driver when transmit completes
1630  * reenable network layer transmit if stopped
1631  *
1632  * info  pointer to device instance information
1633  */
1634 static void hdlcdev_tx_done(struct slgt_info *info)
1635 {
1636         if (netif_queue_stopped(info->netdev))
1637                 netif_wake_queue(info->netdev);
1638 }
1639
1640 /**
1641  * called by device driver when frame received
1642  * pass frame to network layer
1643  *
1644  * info  pointer to device instance information
1645  * buf   pointer to buffer contianing frame data
1646  * size  count of data bytes in buf
1647  */
1648 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1649 {
1650         struct sk_buff *skb = dev_alloc_skb(size);
1651         struct net_device *dev = info->netdev;
1652         struct net_device_stats *stats = hdlc_stats(dev);
1653
1654         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1655
1656         if (skb == NULL) {
1657                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1658                 stats->rx_dropped++;
1659                 return;
1660         }
1661
1662         memcpy(skb_put(skb, size),buf,size);
1663
1664         skb->protocol = hdlc_type_trans(skb, info->netdev);
1665
1666         stats->rx_packets++;
1667         stats->rx_bytes += size;
1668
1669         netif_rx(skb);
1670
1671         info->netdev->last_rx = jiffies;
1672 }
1673
1674 /**
1675  * called by device driver when adding device instance
1676  * do generic HDLC initialization
1677  *
1678  * info  pointer to device instance information
1679  *
1680  * returns 0 if success, otherwise error code
1681  */
1682 static int hdlcdev_init(struct slgt_info *info)
1683 {
1684         int rc;
1685         struct net_device *dev;
1686         hdlc_device *hdlc;
1687
1688         /* allocate and initialize network and HDLC layer objects */
1689
1690         if (!(dev = alloc_hdlcdev(info))) {
1691                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1692                 return -ENOMEM;
1693         }
1694
1695         /* for network layer reporting purposes only */
1696         dev->mem_start = info->phys_reg_addr;
1697         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1698         dev->irq       = info->irq_level;
1699
1700         /* network layer callbacks and settings */
1701         dev->do_ioctl       = hdlcdev_ioctl;
1702         dev->open           = hdlcdev_open;
1703         dev->stop           = hdlcdev_close;
1704         dev->tx_timeout     = hdlcdev_tx_timeout;
1705         dev->watchdog_timeo = 10*HZ;
1706         dev->tx_queue_len   = 50;
1707
1708         /* generic HDLC layer callbacks and settings */
1709         hdlc         = dev_to_hdlc(dev);
1710         hdlc->attach = hdlcdev_attach;
1711         hdlc->xmit   = hdlcdev_xmit;
1712
1713         /* register objects with HDLC layer */
1714         if ((rc = register_hdlc_device(dev))) {
1715                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1716                 free_netdev(dev);
1717                 return rc;
1718         }
1719
1720         info->netdev = dev;
1721         return 0;
1722 }
1723
1724 /**
1725  * called by device driver when removing device instance
1726  * do generic HDLC cleanup
1727  *
1728  * info  pointer to device instance information
1729  */
1730 static void hdlcdev_exit(struct slgt_info *info)
1731 {
1732         unregister_hdlc_device(info->netdev);
1733         free_netdev(info->netdev);
1734         info->netdev = NULL;
1735 }
1736
1737 #endif /* ifdef CONFIG_HDLC */
1738
1739 /*
1740  * get async data from rx DMA buffers
1741  */
1742 static void rx_async(struct slgt_info *info)
1743 {
1744         struct tty_struct *tty = info->tty;
1745         struct mgsl_icount *icount = &info->icount;
1746         unsigned int start, end;
1747         unsigned char *p;
1748         unsigned char status;
1749         struct slgt_desc *bufs = info->rbufs;
1750         int i, count;
1751         int chars = 0;
1752         int stat;
1753         unsigned char ch;
1754
1755         start = end = info->rbuf_current;
1756
1757         while(desc_complete(bufs[end])) {
1758                 count = desc_count(bufs[end]) - info->rbuf_index;
1759                 p     = bufs[end].buf + info->rbuf_index;
1760
1761                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1762                 DBGDATA(info, p, count, "rx");
1763
1764                 for(i=0 ; i < count; i+=2, p+=2) {
1765                         if (tty && chars) {
1766                                 tty_flip_buffer_push(tty);
1767                                 chars = 0;
1768                         }
1769                         ch = *p;
1770                         icount->rx++;
1771
1772                         stat = 0;
1773
1774                         if ((status = *(p+1) & (BIT9 + BIT8))) {
1775                                 if (status & BIT9)
1776                                         icount->parity++;
1777                                 else if (status & BIT8)
1778                                         icount->frame++;
1779                                 /* discard char if tty control flags say so */
1780                                 if (status & info->ignore_status_mask)
1781                                         continue;
1782                                 if (status & BIT9)
1783                                         stat = TTY_PARITY;
1784                                 else if (status & BIT8)
1785                                         stat = TTY_FRAME;
1786                         }
1787                         if (tty) {
1788                                 tty_insert_flip_char(tty, ch, stat);
1789                                 chars++;
1790                         }
1791                 }
1792
1793                 if (i < count) {
1794                         /* receive buffer not completed */
1795                         info->rbuf_index += i;
1796                         info->rx_timer.expires = jiffies + 1;
1797                         add_timer(&info->rx_timer);
1798                         break;
1799                 }
1800
1801                 info->rbuf_index = 0;
1802                 free_rbufs(info, end, end);
1803
1804                 if (++end == info->rbuf_count)
1805                         end = 0;
1806
1807                 /* if entire list searched then no frame available */
1808                 if (end == start)
1809                         break;
1810         }
1811
1812         if (tty && chars)
1813                 tty_flip_buffer_push(tty);
1814 }
1815
1816 /*
1817  * return next bottom half action to perform
1818  */
1819 static int bh_action(struct slgt_info *info)
1820 {
1821         unsigned long flags;
1822         int rc;
1823
1824         spin_lock_irqsave(&info->lock,flags);
1825
1826         if (info->pending_bh & BH_RECEIVE) {
1827                 info->pending_bh &= ~BH_RECEIVE;
1828                 rc = BH_RECEIVE;
1829         } else if (info->pending_bh & BH_TRANSMIT) {
1830                 info->pending_bh &= ~BH_TRANSMIT;
1831                 rc = BH_TRANSMIT;
1832         } else if (info->pending_bh & BH_STATUS) {
1833                 info->pending_bh &= ~BH_STATUS;
1834                 rc = BH_STATUS;
1835         } else {
1836                 /* Mark BH routine as complete */
1837                 info->bh_running   = 0;
1838                 info->bh_requested = 0;
1839                 rc = 0;
1840         }
1841
1842         spin_unlock_irqrestore(&info->lock,flags);
1843
1844         return rc;
1845 }
1846
1847 /*
1848  * perform bottom half processing
1849  */
1850 static void bh_handler(void* context)
1851 {
1852         struct slgt_info *info = context;
1853         int action;
1854
1855         if (!info)
1856                 return;
1857         info->bh_running = 1;
1858
1859         while((action = bh_action(info))) {
1860                 switch (action) {
1861                 case BH_RECEIVE:
1862                         DBGBH(("%s bh receive\n", info->device_name));
1863                         switch(info->params.mode) {
1864                         case MGSL_MODE_ASYNC:
1865                                 rx_async(info);
1866                                 break;
1867                         case MGSL_MODE_HDLC:
1868                                 while(rx_get_frame(info));
1869                                 break;
1870                         case MGSL_MODE_RAW:
1871                                 while(rx_get_buf(info));
1872                                 break;
1873                         }
1874                         /* restart receiver if rx DMA buffers exhausted */
1875                         if (info->rx_restart)
1876                                 rx_start(info);
1877                         break;
1878                 case BH_TRANSMIT:
1879                         bh_transmit(info);
1880                         break;
1881                 case BH_STATUS:
1882                         DBGBH(("%s bh status\n", info->device_name));
1883                         info->ri_chkcount = 0;
1884                         info->dsr_chkcount = 0;
1885                         info->dcd_chkcount = 0;
1886                         info->cts_chkcount = 0;
1887                         break;
1888                 default:
1889                         DBGBH(("%s unknown action\n", info->device_name));
1890                         break;
1891                 }
1892         }
1893         DBGBH(("%s bh_handler exit\n", info->device_name));
1894 }
1895
1896 static void bh_transmit(struct slgt_info *info)
1897 {
1898         struct tty_struct *tty = info->tty;
1899
1900         DBGBH(("%s bh_transmit\n", info->device_name));
1901         if (tty) {
1902                 tty_wakeup(tty);
1903                 wake_up_interruptible(&tty->write_wait);
1904         }
1905 }
1906
1907 static void dsr_change(struct slgt_info *info)
1908 {
1909         get_signals(info);
1910         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1911         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1912                 slgt_irq_off(info, IRQ_DSR);
1913                 return;
1914         }
1915         info->icount.dsr++;
1916         if (info->signals & SerialSignal_DSR)
1917                 info->input_signal_events.dsr_up++;
1918         else
1919                 info->input_signal_events.dsr_down++;
1920         wake_up_interruptible(&info->status_event_wait_q);
1921         wake_up_interruptible(&info->event_wait_q);
1922         info->pending_bh |= BH_STATUS;
1923 }
1924
1925 static void cts_change(struct slgt_info *info)
1926 {
1927         get_signals(info);
1928         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1929         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1930                 slgt_irq_off(info, IRQ_CTS);
1931                 return;
1932         }
1933         info->icount.cts++;
1934         if (info->signals & SerialSignal_CTS)
1935                 info->input_signal_events.cts_up++;
1936         else
1937                 info->input_signal_events.cts_down++;
1938         wake_up_interruptible(&info->status_event_wait_q);
1939         wake_up_interruptible(&info->event_wait_q);
1940         info->pending_bh |= BH_STATUS;
1941
1942         if (info->flags & ASYNC_CTS_FLOW) {
1943                 if (info->tty) {
1944                         if (info->tty->hw_stopped) {
1945                                 if (info->signals & SerialSignal_CTS) {
1946                                         info->tty->hw_stopped = 0;
1947                                         info->pending_bh |= BH_TRANSMIT;
1948                                         return;
1949                                 }
1950                         } else {
1951                                 if (!(info->signals & SerialSignal_CTS))
1952                                         info->tty->hw_stopped = 1;
1953                         }
1954                 }
1955         }
1956 }
1957
1958 static void dcd_change(struct slgt_info *info)
1959 {
1960         get_signals(info);
1961         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1962         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1963                 slgt_irq_off(info, IRQ_DCD);
1964                 return;
1965         }
1966         info->icount.dcd++;
1967         if (info->signals & SerialSignal_DCD) {
1968                 info->input_signal_events.dcd_up++;
1969         } else {
1970                 info->input_signal_events.dcd_down++;
1971         }
1972 #ifdef CONFIG_HDLC
1973         if (info->netcount)
1974                 hdlc_set_carrier(info->signals & SerialSignal_DCD, info->netdev);
1975 #endif
1976         wake_up_interruptible(&info->status_event_wait_q);
1977         wake_up_interruptible(&info->event_wait_q);
1978         info->pending_bh |= BH_STATUS;
1979
1980         if (info->flags & ASYNC_CHECK_CD) {
1981                 if (info->signals & SerialSignal_DCD)
1982                         wake_up_interruptible(&info->open_wait);
1983                 else {
1984                         if (info->tty)
1985                                 tty_hangup(info->tty);
1986                 }
1987         }
1988 }
1989
1990 static void ri_change(struct slgt_info *info)
1991 {
1992         get_signals(info);
1993         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
1994         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1995                 slgt_irq_off(info, IRQ_RI);
1996                 return;
1997         }
1998         info->icount.dcd++;
1999         if (info->signals & SerialSignal_RI) {
2000                 info->input_signal_events.ri_up++;
2001         } else {
2002                 info->input_signal_events.ri_down++;
2003         }
2004         wake_up_interruptible(&info->status_event_wait_q);
2005         wake_up_interruptible(&info->event_wait_q);
2006         info->pending_bh |= BH_STATUS;
2007 }
2008
2009 static void isr_serial(struct slgt_info *info)
2010 {
2011         unsigned short status = rd_reg16(info, SSR);
2012
2013         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2014
2015         wr_reg16(info, SSR, status); /* clear pending */
2016
2017         info->irq_occurred = 1;
2018
2019         if (info->params.mode == MGSL_MODE_ASYNC) {
2020                 if (status & IRQ_TXIDLE) {
2021                         if (info->tx_count)
2022                                 isr_txeom(info, status);
2023                 }
2024                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2025                         info->icount.brk++;
2026                         /* process break detection if tty control allows */
2027                         if (info->tty) {
2028                                 if (!(status & info->ignore_status_mask)) {
2029                                         if (info->read_status_mask & MASK_BREAK) {
2030                                                 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
2031                                                 if (info->flags & ASYNC_SAK)
2032                                                         do_SAK(info->tty);
2033                                         }
2034                                 }
2035                         }
2036                 }
2037         } else {
2038                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2039                         isr_txeom(info, status);
2040
2041                 if (status & IRQ_RXIDLE) {
2042                         if (status & RXIDLE)
2043                                 info->icount.rxidle++;
2044                         else
2045                                 info->icount.exithunt++;
2046                         wake_up_interruptible(&info->event_wait_q);
2047                 }
2048
2049                 if (status & IRQ_RXOVER)
2050                         rx_start(info);
2051         }
2052
2053         if (status & IRQ_DSR)
2054                 dsr_change(info);
2055         if (status & IRQ_CTS)
2056                 cts_change(info);
2057         if (status & IRQ_DCD)
2058                 dcd_change(info);
2059         if (status & IRQ_RI)
2060                 ri_change(info);
2061 }
2062
2063 static void isr_rdma(struct slgt_info *info)
2064 {
2065         unsigned int status = rd_reg32(info, RDCSR);
2066
2067         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2068
2069         /* RDCSR (rx DMA control/status)
2070          *
2071          * 31..07  reserved
2072          * 06      save status byte to DMA buffer
2073          * 05      error
2074          * 04      eol (end of list)
2075          * 03      eob (end of buffer)
2076          * 02      IRQ enable
2077          * 01      reset
2078          * 00      enable
2079          */
2080         wr_reg32(info, RDCSR, status);  /* clear pending */
2081
2082         if (status & (BIT5 + BIT4)) {
2083                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2084                 info->rx_restart = 1;
2085         }
2086         info->pending_bh |= BH_RECEIVE;
2087 }
2088
2089 static void isr_tdma(struct slgt_info *info)
2090 {
2091         unsigned int status = rd_reg32(info, TDCSR);
2092
2093         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2094
2095         /* TDCSR (tx DMA control/status)
2096          *
2097          * 31..06  reserved
2098          * 05      error
2099          * 04      eol (end of list)
2100          * 03      eob (end of buffer)
2101          * 02      IRQ enable
2102          * 01      reset
2103          * 00      enable
2104          */
2105         wr_reg32(info, TDCSR, status);  /* clear pending */
2106
2107         if (status & (BIT5 + BIT4 + BIT3)) {
2108                 // another transmit buffer has completed
2109                 // run bottom half to get more send data from user
2110                 info->pending_bh |= BH_TRANSMIT;
2111         }
2112 }
2113
2114 static void isr_txeom(struct slgt_info *info, unsigned short status)
2115 {
2116         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2117
2118         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2119         tdma_reset(info);
2120         reset_tbufs(info);
2121         if (status & IRQ_TXUNDER) {
2122                 unsigned short val = rd_reg16(info, TCR);
2123                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2124                 wr_reg16(info, TCR, val); /* clear reset bit */
2125         }
2126
2127         if (info->tx_active) {
2128                 if (info->params.mode != MGSL_MODE_ASYNC) {
2129                         if (status & IRQ_TXUNDER)
2130                                 info->icount.txunder++;
2131                         else if (status & IRQ_TXIDLE)
2132                                 info->icount.txok++;
2133                 }
2134
2135                 info->tx_active = 0;
2136                 info->tx_count = 0;
2137
2138                 del_timer(&info->tx_timer);
2139
2140                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2141                         info->signals &= ~SerialSignal_RTS;
2142                         info->drop_rts_on_tx_done = 0;
2143                         set_signals(info);
2144                 }
2145
2146 #ifdef CONFIG_HDLC
2147                 if (info->netcount)
2148                         hdlcdev_tx_done(info);
2149                 else
2150 #endif
2151                 {
2152                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2153                                 tx_stop(info);
2154                                 return;
2155                         }
2156                         info->pending_bh |= BH_TRANSMIT;
2157                 }
2158         }
2159 }
2160
2161 /* interrupt service routine
2162  *
2163  *      irq     interrupt number
2164  *      dev_id  device ID supplied during interrupt registration
2165  *      regs    interrupted processor context
2166  */
2167 static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs)
2168 {
2169         struct slgt_info *info;
2170         unsigned int gsr;
2171         unsigned int i;
2172
2173         DBGISR(("slgt_interrupt irq=%d entry\n", irq));
2174
2175         info = dev_id;
2176         if (!info)
2177                 return IRQ_NONE;
2178
2179         spin_lock(&info->lock);
2180
2181         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2182                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2183                 info->irq_occurred = 1;
2184                 for(i=0; i < info->port_count ; i++) {
2185                         if (info->port_array[i] == NULL)
2186                                 continue;
2187                         if (gsr & (BIT8 << i))
2188                                 isr_serial(info->port_array[i]);
2189                         if (gsr & (BIT16 << (i*2)))
2190                                 isr_rdma(info->port_array[i]);
2191                         if (gsr & (BIT17 << (i*2)))
2192                                 isr_tdma(info->port_array[i]);
2193                 }
2194         }
2195
2196         for(i=0; i < info->port_count ; i++) {
2197                 struct slgt_info *port = info->port_array[i];
2198
2199                 if (port && (port->count || port->netcount) &&
2200                     port->pending_bh && !port->bh_running &&
2201                     !port->bh_requested) {
2202                         DBGISR(("%s bh queued\n", port->device_name));
2203                         schedule_work(&port->task);
2204                         port->bh_requested = 1;
2205                 }
2206         }
2207
2208         spin_unlock(&info->lock);
2209
2210         DBGISR(("slgt_interrupt irq=%d exit\n", irq));
2211         return IRQ_HANDLED;
2212 }
2213
2214 static int startup(struct slgt_info *info)
2215 {
2216         DBGINFO(("%s startup\n", info->device_name));
2217
2218         if (info->flags & ASYNC_INITIALIZED)
2219                 return 0;
2220
2221         if (!info->tx_buf) {
2222                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2223                 if (!info->tx_buf) {
2224                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2225                         return -ENOMEM;
2226                 }
2227         }
2228
2229         info->pending_bh = 0;
2230
2231         memset(&info->icount, 0, sizeof(info->icount));
2232
2233         /* program hardware for current parameters */
2234         change_params(info);
2235
2236         if (info->tty)
2237                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2238
2239         info->flags |= ASYNC_INITIALIZED;
2240
2241         return 0;
2242 }
2243
2244 /*
2245  *  called by close() and hangup() to shutdown hardware
2246  */
2247 static void shutdown(struct slgt_info *info)
2248 {
2249         unsigned long flags;
2250
2251         if (!(info->flags & ASYNC_INITIALIZED))
2252                 return;
2253
2254         DBGINFO(("%s shutdown\n", info->device_name));
2255
2256         /* clear status wait queue because status changes */
2257         /* can't happen after shutting down the hardware */
2258         wake_up_interruptible(&info->status_event_wait_q);
2259         wake_up_interruptible(&info->event_wait_q);
2260
2261         del_timer_sync(&info->tx_timer);
2262         del_timer_sync(&info->rx_timer);
2263
2264         kfree(info->tx_buf);
2265         info->tx_buf = NULL;
2266
2267         spin_lock_irqsave(&info->lock,flags);
2268
2269         tx_stop(info);
2270         rx_stop(info);
2271
2272         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2273
2274         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2275                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2276                 set_signals(info);
2277         }
2278
2279         spin_unlock_irqrestore(&info->lock,flags);
2280
2281         if (info->tty)
2282                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2283
2284         info->flags &= ~ASYNC_INITIALIZED;
2285 }
2286
2287 static void program_hw(struct slgt_info *info)
2288 {
2289         unsigned long flags;
2290
2291         spin_lock_irqsave(&info->lock,flags);
2292
2293         rx_stop(info);
2294         tx_stop(info);
2295
2296         if (info->params.mode == MGSL_MODE_HDLC ||
2297             info->params.mode == MGSL_MODE_RAW ||
2298             info->netcount)
2299                 hdlc_mode(info);
2300         else
2301                 async_mode(info);
2302
2303         set_signals(info);
2304
2305         info->dcd_chkcount = 0;
2306         info->cts_chkcount = 0;
2307         info->ri_chkcount = 0;
2308         info->dsr_chkcount = 0;
2309
2310         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2311         get_signals(info);
2312
2313         if (info->netcount ||
2314             (info->tty && info->tty->termios->c_cflag & CREAD))
2315                 rx_start(info);
2316
2317         spin_unlock_irqrestore(&info->lock,flags);
2318 }
2319
2320 /*
2321  * reconfigure adapter based on new parameters
2322  */
2323 static void change_params(struct slgt_info *info)
2324 {
2325         unsigned cflag;
2326         int bits_per_char;
2327
2328         if (!info->tty || !info->tty->termios)
2329                 return;
2330         DBGINFO(("%s change_params\n", info->device_name));
2331
2332         cflag = info->tty->termios->c_cflag;
2333
2334         /* if B0 rate (hangup) specified then negate DTR and RTS */
2335         /* otherwise assert DTR and RTS */
2336         if (cflag & CBAUD)
2337                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2338         else
2339                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2340
2341         /* byte size and parity */
2342
2343         switch (cflag & CSIZE) {
2344         case CS5: info->params.data_bits = 5; break;
2345         case CS6: info->params.data_bits = 6; break;
2346         case CS7: info->params.data_bits = 7; break;
2347         case CS8: info->params.data_bits = 8; break;
2348         default:  info->params.data_bits = 7; break;
2349         }
2350
2351         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2352
2353         if (cflag & PARENB)
2354                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2355         else
2356                 info->params.parity = ASYNC_PARITY_NONE;
2357
2358         /* calculate number of jiffies to transmit a full
2359          * FIFO (32 bytes) at specified data rate
2360          */
2361         bits_per_char = info->params.data_bits +
2362                         info->params.stop_bits + 1;
2363
2364         info->params.data_rate = tty_get_baud_rate(info->tty);
2365
2366         if (info->params.data_rate) {
2367                 info->timeout = (32*HZ*bits_per_char) /
2368                                 info->params.data_rate;
2369         }
2370         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2371
2372         if (cflag & CRTSCTS)
2373                 info->flags |= ASYNC_CTS_FLOW;
2374         else
2375                 info->flags &= ~ASYNC_CTS_FLOW;
2376
2377         if (cflag & CLOCAL)
2378                 info->flags &= ~ASYNC_CHECK_CD;
2379         else
2380                 info->flags |= ASYNC_CHECK_CD;
2381
2382         /* process tty input control flags */
2383
2384         info->read_status_mask = IRQ_RXOVER;
2385         if (I_INPCK(info->tty))
2386                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2387         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2388                 info->read_status_mask |= MASK_BREAK;
2389         if (I_IGNPAR(info->tty))
2390                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2391         if (I_IGNBRK(info->tty)) {
2392                 info->ignore_status_mask |= MASK_BREAK;
2393                 /* If ignoring parity and break indicators, ignore
2394                  * overruns too.  (For real raw support).
2395                  */
2396                 if (I_IGNPAR(info->tty))
2397                         info->ignore_status_mask |= MASK_OVERRUN;
2398         }
2399
2400         program_hw(info);
2401 }
2402
2403 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2404 {
2405         DBGINFO(("%s get_stats\n",  info->device_name));
2406         if (!user_icount) {
2407                 memset(&info->icount, 0, sizeof(info->icount));
2408         } else {
2409                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2410                         return -EFAULT;
2411         }
2412         return 0;
2413 }
2414
2415 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2416 {
2417         DBGINFO(("%s get_params\n", info->device_name));
2418         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2419                 return -EFAULT;
2420         return 0;
2421 }
2422
2423 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2424 {
2425         unsigned long flags;
2426         MGSL_PARAMS tmp_params;
2427
2428         DBGINFO(("%s set_params\n", info->device_name));
2429         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2430                 return -EFAULT;
2431
2432         spin_lock_irqsave(&info->lock, flags);
2433         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2434         spin_unlock_irqrestore(&info->lock, flags);
2435
2436         change_params(info);
2437
2438         return 0;
2439 }
2440
2441 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2442 {
2443         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2444         if (put_user(info->idle_mode, idle_mode))
2445                 return -EFAULT;
2446         return 0;
2447 }
2448
2449 static int set_txidle(struct slgt_info *info, int idle_mode)
2450 {
2451         unsigned long flags;
2452         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2453         spin_lock_irqsave(&info->lock,flags);
2454         info->idle_mode = idle_mode;
2455         tx_set_idle(info);
2456         spin_unlock_irqrestore(&info->lock,flags);
2457         return 0;
2458 }
2459
2460 static int tx_enable(struct slgt_info *info, int enable)
2461 {
2462         unsigned long flags;
2463         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2464         spin_lock_irqsave(&info->lock,flags);
2465         if (enable) {
2466                 if (!info->tx_enabled)
2467                         tx_start(info);
2468         } else {
2469                 if (info->tx_enabled)
2470                         tx_stop(info);
2471         }
2472         spin_unlock_irqrestore(&info->lock,flags);
2473         return 0;
2474 }
2475
2476 /*
2477  * abort transmit HDLC frame
2478  */
2479 static int tx_abort(struct slgt_info *info)
2480 {
2481         unsigned long flags;
2482         DBGINFO(("%s tx_abort\n", info->device_name));
2483         spin_lock_irqsave(&info->lock,flags);
2484         tdma_reset(info);
2485         spin_unlock_irqrestore(&info->lock,flags);
2486         return 0;
2487 }
2488
2489 static int rx_enable(struct slgt_info *info, int enable)
2490 {
2491         unsigned long flags;
2492         DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2493         spin_lock_irqsave(&info->lock,flags);
2494         if (enable) {
2495                 if (!info->rx_enabled)
2496                         rx_start(info);
2497         } else {
2498                 if (info->rx_enabled)
2499                         rx_stop(info);
2500         }
2501         spin_unlock_irqrestore(&info->lock,flags);
2502         return 0;
2503 }
2504
2505 /*
2506  *  wait for specified event to occur
2507  */
2508 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2509 {
2510         unsigned long flags;
2511         int s;
2512         int rc=0;
2513         struct mgsl_icount cprev, cnow;
2514         int events;
2515         int mask;
2516         struct  _input_signal_events oldsigs, newsigs;
2517         DECLARE_WAITQUEUE(wait, current);
2518
2519         if (get_user(mask, mask_ptr))
2520                 return -EFAULT;
2521
2522         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2523
2524         spin_lock_irqsave(&info->lock,flags);
2525
2526         /* return immediately if state matches requested events */
2527         get_signals(info);
2528         s = info->signals;
2529
2530         events = mask &
2531                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2532                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2533                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2534                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2535         if (events) {
2536                 spin_unlock_irqrestore(&info->lock,flags);
2537                 goto exit;
2538         }
2539
2540         /* save current irq counts */
2541         cprev = info->icount;
2542         oldsigs = info->input_signal_events;
2543
2544         /* enable hunt and idle irqs if needed */
2545         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2546                 unsigned short val = rd_reg16(info, SCR);
2547                 if (!(val & IRQ_RXIDLE))
2548                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2549         }
2550
2551         set_current_state(TASK_INTERRUPTIBLE);
2552         add_wait_queue(&info->event_wait_q, &wait);
2553
2554         spin_unlock_irqrestore(&info->lock,flags);
2555
2556         for(;;) {
2557                 schedule();
2558                 if (signal_pending(current)) {
2559                         rc = -ERESTARTSYS;
2560                         break;
2561                 }
2562
2563                 /* get current irq counts */
2564                 spin_lock_irqsave(&info->lock,flags);
2565                 cnow = info->icount;
2566                 newsigs = info->input_signal_events;
2567                 set_current_state(TASK_INTERRUPTIBLE);
2568                 spin_unlock_irqrestore(&info->lock,flags);
2569
2570                 /* if no change, wait aborted for some reason */
2571                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2572                     newsigs.dsr_down == oldsigs.dsr_down &&
2573                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2574                     newsigs.dcd_down == oldsigs.dcd_down &&
2575                     newsigs.cts_up   == oldsigs.cts_up   &&
2576                     newsigs.cts_down == oldsigs.cts_down &&
2577                     newsigs.ri_up    == oldsigs.ri_up    &&
2578                     newsigs.ri_down  == oldsigs.ri_down  &&
2579                     cnow.exithunt    == cprev.exithunt   &&
2580                     cnow.rxidle      == cprev.rxidle) {
2581                         rc = -EIO;
2582                         break;
2583                 }
2584
2585                 events = mask &
2586                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2587                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2588                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2589                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2590                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2591                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2592                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2593                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2594                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2595                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2596                 if (events)
2597                         break;
2598
2599                 cprev = cnow;
2600                 oldsigs = newsigs;
2601         }
2602
2603         remove_wait_queue(&info->event_wait_q, &wait);
2604         set_current_state(TASK_RUNNING);
2605
2606
2607         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2608                 spin_lock_irqsave(&info->lock,flags);
2609                 if (!waitqueue_active(&info->event_wait_q)) {
2610                         /* disable enable exit hunt mode/idle rcvd IRQs */
2611                         wr_reg16(info, SCR,
2612                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2613                 }
2614                 spin_unlock_irqrestore(&info->lock,flags);
2615         }
2616 exit:
2617         if (rc == 0)
2618                 rc = put_user(events, mask_ptr);
2619         return rc;
2620 }
2621
2622 static int get_interface(struct slgt_info *info, int __user *if_mode)
2623 {
2624         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2625         if (put_user(info->if_mode, if_mode))
2626                 return -EFAULT;
2627         return 0;
2628 }
2629
2630 static int set_interface(struct slgt_info *info, int if_mode)
2631 {
2632         unsigned long flags;
2633         unsigned short val;
2634
2635         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2636         spin_lock_irqsave(&info->lock,flags);
2637         info->if_mode = if_mode;
2638
2639         msc_set_vcr(info);
2640
2641         /* TCR (tx control) 07  1=RTS driver control */
2642         val = rd_reg16(info, TCR);
2643         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2644                 val |= BIT7;
2645         else
2646                 val &= ~BIT7;
2647         wr_reg16(info, TCR, val);
2648
2649         spin_unlock_irqrestore(&info->lock,flags);
2650         return 0;
2651 }
2652
2653 static int modem_input_wait(struct slgt_info *info,int arg)
2654 {
2655         unsigned long flags;
2656         int rc;
2657         struct mgsl_icount cprev, cnow;
2658         DECLARE_WAITQUEUE(wait, current);
2659
2660         /* save current irq counts */
2661         spin_lock_irqsave(&info->lock,flags);
2662         cprev = info->icount;
2663         add_wait_queue(&info->status_event_wait_q, &wait);
2664         set_current_state(TASK_INTERRUPTIBLE);
2665         spin_unlock_irqrestore(&info->lock,flags);
2666
2667         for(;;) {
2668                 schedule();
2669                 if (signal_pending(current)) {
2670                         rc = -ERESTARTSYS;
2671                         break;
2672                 }
2673
2674                 /* get new irq counts */
2675                 spin_lock_irqsave(&info->lock,flags);
2676                 cnow = info->icount;
2677                 set_current_state(TASK_INTERRUPTIBLE);
2678                 spin_unlock_irqrestore(&info->lock,flags);
2679
2680                 /* if no change, wait aborted for some reason */
2681                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2682                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2683                         rc = -EIO;
2684                         break;
2685                 }
2686
2687                 /* check for change in caller specified modem input */
2688                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2689                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2690                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
2691                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2692                         rc = 0;
2693                         break;
2694                 }
2695
2696                 cprev = cnow;
2697         }
2698         remove_wait_queue(&info->status_event_wait_q, &wait);
2699         set_current_state(TASK_RUNNING);
2700         return rc;
2701 }
2702
2703 /*
2704  *  return state of serial control and status signals
2705  */
2706 static int tiocmget(struct tty_struct *tty, struct file *file)
2707 {
2708         struct slgt_info *info = tty->driver_data;
2709         unsigned int result;
2710         unsigned long flags;
2711
2712         spin_lock_irqsave(&info->lock,flags);
2713         get_signals(info);
2714         spin_unlock_irqrestore(&info->lock,flags);
2715
2716         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2717                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2718                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2719                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
2720                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2721                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2722
2723         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
2724         return result;
2725 }
2726
2727 /*
2728  * set modem control signals (DTR/RTS)
2729  *
2730  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
2731  *              TIOCMSET = set/clear signal values
2732  *      value   bit mask for command
2733  */
2734 static int tiocmset(struct tty_struct *tty, struct file *file,
2735                     unsigned int set, unsigned int clear)
2736 {
2737         struct slgt_info *info = tty->driver_data;
2738         unsigned long flags;
2739
2740         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
2741
2742         if (set & TIOCM_RTS)
2743                 info->signals |= SerialSignal_RTS;
2744         if (set & TIOCM_DTR)
2745                 info->signals |= SerialSignal_DTR;
2746         if (clear & TIOCM_RTS)
2747                 info->signals &= ~SerialSignal_RTS;
2748         if (clear & TIOCM_DTR)
2749                 info->signals &= ~SerialSignal_DTR;
2750
2751         spin_lock_irqsave(&info->lock,flags);
2752         set_signals(info);
2753         spin_unlock_irqrestore(&info->lock,flags);
2754         return 0;
2755 }
2756
2757 /*
2758  *  block current process until the device is ready to open
2759  */
2760 static int block_til_ready(struct tty_struct *tty, struct file *filp,
2761                            struct slgt_info *info)
2762 {
2763         DECLARE_WAITQUEUE(wait, current);
2764         int             retval;
2765         int             do_clocal = 0, extra_count = 0;
2766         unsigned long   flags;
2767
2768         DBGINFO(("%s block_til_ready\n", tty->driver->name));
2769
2770         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
2771                 /* nonblock mode is set or port is not enabled */
2772                 info->flags |= ASYNC_NORMAL_ACTIVE;
2773                 return 0;
2774         }
2775
2776         if (tty->termios->c_cflag & CLOCAL)
2777                 do_clocal = 1;
2778
2779         /* Wait for carrier detect and the line to become
2780          * free (i.e., not in use by the callout).  While we are in
2781          * this loop, info->count is dropped by one, so that
2782          * close() knows when to free things.  We restore it upon
2783          * exit, either normal or abnormal.
2784          */
2785
2786         retval = 0;
2787         add_wait_queue(&info->open_wait, &wait);
2788
2789         spin_lock_irqsave(&info->lock, flags);
2790         if (!tty_hung_up_p(filp)) {
2791                 extra_count = 1;
2792                 info->count--;
2793         }
2794         spin_unlock_irqrestore(&info->lock, flags);
2795         info->blocked_open++;
2796
2797         while (1) {
2798                 if ((tty->termios->c_cflag & CBAUD)) {
2799                         spin_lock_irqsave(&info->lock,flags);
2800                         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2801                         set_signals(info);
2802                         spin_unlock_irqrestore(&info->lock,flags);
2803                 }
2804
2805                 set_current_state(TASK_INTERRUPTIBLE);
2806
2807                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
2808                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
2809                                         -EAGAIN : -ERESTARTSYS;
2810                         break;
2811                 }
2812
2813                 spin_lock_irqsave(&info->lock,flags);
2814                 get_signals(info);
2815                 spin_unlock_irqrestore(&info->lock,flags);
2816
2817                 if (!(info->flags & ASYNC_CLOSING) &&
2818                     (do_clocal || (info->signals & SerialSignal_DCD)) ) {
2819                         break;
2820                 }
2821
2822                 if (signal_pending(current)) {
2823                         retval = -ERESTARTSYS;
2824                         break;
2825                 }
2826
2827                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
2828                 schedule();
2829         }
2830
2831         set_current_state(TASK_RUNNING);
2832         remove_wait_queue(&info->open_wait, &wait);
2833
2834         if (extra_count)
2835                 info->count++;
2836         info->blocked_open--;
2837
2838         if (!retval)
2839                 info->flags |= ASYNC_NORMAL_ACTIVE;
2840
2841         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
2842         return retval;
2843 }
2844
2845 static int alloc_tmp_rbuf(struct slgt_info *info)
2846 {
2847         info->tmp_rbuf = kmalloc(info->max_frame_size, GFP_KERNEL);
2848         if (info->tmp_rbuf == NULL)
2849                 return -ENOMEM;
2850         return 0;
2851 }
2852
2853 static void free_tmp_rbuf(struct slgt_info *info)
2854 {
2855         kfree(info->tmp_rbuf);
2856         info->tmp_rbuf = NULL;
2857 }
2858
2859 /*
2860  * allocate DMA descriptor lists.
2861  */
2862 static int alloc_desc(struct slgt_info *info)
2863 {
2864         unsigned int i;
2865         unsigned int pbufs;
2866
2867         /* allocate memory to hold descriptor lists */
2868         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
2869         if (info->bufs == NULL)
2870                 return -ENOMEM;
2871
2872         memset(info->bufs, 0, DESC_LIST_SIZE);
2873
2874         info->rbufs = (struct slgt_desc*)info->bufs;
2875         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
2876
2877         pbufs = (unsigned int)info->bufs_dma_addr;
2878
2879         /*
2880          * Build circular lists of descriptors
2881          */
2882
2883         for (i=0; i < info->rbuf_count; i++) {
2884                 /* physical address of this descriptor */
2885                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
2886
2887                 /* physical address of next descriptor */
2888                 if (i == info->rbuf_count - 1)
2889                         info->rbufs[i].next = cpu_to_le32(pbufs);
2890                 else
2891                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
2892                 set_desc_count(info->rbufs[i], DMABUFSIZE);
2893         }
2894
2895         for (i=0; i < info->tbuf_count; i++) {
2896                 /* physical address of this descriptor */
2897                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
2898
2899                 /* physical address of next descriptor */
2900                 if (i == info->tbuf_count - 1)
2901                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
2902                 else
2903                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
2904         }
2905
2906         return 0;
2907 }
2908
2909 static void free_desc(struct slgt_info *info)
2910 {
2911         if (info->bufs != NULL) {
2912                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
2913                 info->bufs  = NULL;
2914                 info->rbufs = NULL;
2915                 info->tbufs = NULL;
2916         }
2917 }
2918
2919 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
2920 {
2921         int i;
2922         for (i=0; i < count; i++) {
2923                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
2924                         return -ENOMEM;
2925                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
2926         }
2927         return 0;
2928 }
2929
2930 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
2931 {
2932         int i;
2933         for (i=0; i < count; i++) {
2934                 if (bufs[i].buf == NULL)
2935                         continue;
2936                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
2937                 bufs[i].buf = NULL;
2938         }
2939 }
2940
2941 static int alloc_dma_bufs(struct slgt_info *info)
2942 {
2943         info->rbuf_count = 32;
2944         info->tbuf_count = 32;
2945
2946         if (alloc_desc(info) < 0 ||
2947             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
2948             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
2949             alloc_tmp_rbuf(info) < 0) {
2950                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
2951                 return -ENOMEM;
2952         }
2953         reset_rbufs(info);
2954         return 0;
2955 }
2956
2957 static void free_dma_bufs(struct slgt_info *info)
2958 {
2959         if (info->bufs) {
2960                 free_bufs(info, info->rbufs, info->rbuf_count);
2961                 free_bufs(info, info->tbufs, info->tbuf_count);
2962                 free_desc(info);
2963         }
2964         free_tmp_rbuf(info);
2965 }
2966
2967 static int claim_resources(struct slgt_info *info)
2968 {
2969         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
2970                 DBGERR(("%s reg addr conflict, addr=%08X\n",
2971                         info->device_name, info->phys_reg_addr));
2972                 info->init_error = DiagStatus_AddressConflict;
2973                 goto errout;
2974         }
2975         else
2976                 info->reg_addr_requested = 1;
2977
2978         info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
2979         if (!info->reg_addr) {
2980                 DBGERR(("%s cant map device registers, addr=%08X\n",
2981                         info->device_name, info->phys_reg_addr));
2982                 info->init_error = DiagStatus_CantAssignPciResources;
2983                 goto errout;
2984         }
2985         return 0;
2986
2987 errout:
2988         release_resources(info);
2989         return -ENODEV;
2990 }
2991
2992 static void release_resources(struct slgt_info *info)
2993 {
2994         if (info->irq_requested) {
2995                 free_irq(info->irq_level, info);
2996                 info->irq_requested = 0;
2997         }
2998
2999         if (info->reg_addr_requested) {
3000                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3001                 info->reg_addr_requested = 0;
3002         }
3003
3004         if (info->reg_addr) {
3005                 iounmap(info->reg_addr);
3006                 info->reg_addr = NULL;
3007         }
3008 }
3009
3010 /* Add the specified device instance data structure to the
3011  * global linked list of devices and increment the device count.
3012  */
3013 static void add_device(struct slgt_info *info)
3014 {
3015         char *devstr;
3016
3017         info->next_device = NULL;
3018         info->line = slgt_device_count;
3019         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3020
3021         if (info->line < MAX_DEVICES) {
3022                 if (maxframe[info->line])
3023                         info->max_frame_size = maxframe[info->line];
3024                 info->dosyncppp = dosyncppp[info->line];
3025         }
3026
3027         slgt_device_count++;
3028
3029         if (!slgt_device_list)
3030                 slgt_device_list = info;
3031         else {
3032                 struct slgt_info *current_dev = slgt_device_list;
3033                 while(current_dev->next_device)
3034                         current_dev = current_dev->next_device;
3035                 current_dev->next_device = info;
3036         }
3037
3038         if (info->max_frame_size < 4096)
3039                 info->max_frame_size = 4096;
3040         else if (info->max_frame_size > 65535)
3041                 info->max_frame_size = 65535;
3042
3043         switch(info->pdev->device) {
3044         case SYNCLINK_GT_DEVICE_ID:
3045                 devstr = "GT";
3046                 break;
3047         case SYNCLINK_GT4_DEVICE_ID:
3048                 devstr = "GT4";
3049                 break;
3050         case SYNCLINK_AC_DEVICE_ID:
3051                 devstr = "AC";
3052                 info->params.mode = MGSL_MODE_ASYNC;
3053                 break;
3054         default:
3055                 devstr = "(unknown model)";
3056         }
3057         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3058                 devstr, info->device_name, info->phys_reg_addr,
3059                 info->irq_level, info->max_frame_size);
3060
3061 #ifdef CONFIG_HDLC
3062         hdlcdev_init(info);
3063 #endif
3064 }
3065
3066 /*
3067  *  allocate device instance structure, return NULL on failure
3068  */
3069 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3070 {
3071         struct slgt_info *info;
3072
3073         info = kmalloc(sizeof(struct slgt_info), GFP_KERNEL);
3074
3075         if (!info) {
3076                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3077                         driver_name, adapter_num, port_num));
3078         } else {
3079                 memset(info, 0, sizeof(struct slgt_info));
3080                 info->magic = MGSL_MAGIC;
3081                 INIT_WORK(&info->task, bh_handler, info);
3082                 info->max_frame_size = 4096;
3083                 info->raw_rx_size = DMABUFSIZE;
3084                 info->close_delay = 5*HZ/10;
3085                 info->closing_wait = 30*HZ;
3086                 init_waitqueue_head(&info->open_wait);
3087                 init_waitqueue_head(&info->close_wait);
3088                 init_waitqueue_head(&info->status_event_wait_q);
3089                 init_waitqueue_head(&info->event_wait_q);
3090                 spin_lock_init(&info->netlock);
3091                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3092                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3093                 info->adapter_num = adapter_num;
3094                 info->port_num = port_num;
3095
3096                 init_timer(&info->tx_timer);
3097                 info->tx_timer.data = (unsigned long)info;
3098                 info->tx_timer.function = tx_timeout;
3099
3100                 init_timer(&info->rx_timer);
3101                 info->rx_timer.data = (unsigned long)info;
3102                 info->rx_timer.function = rx_timeout;
3103
3104                 /* Copy configuration info to device instance data */
3105                 info->pdev = pdev;
3106                 info->irq_level = pdev->irq;
3107                 info->phys_reg_addr = pci_resource_start(pdev,0);
3108
3109                 info->bus_type = MGSL_BUS_TYPE_PCI;
3110                 info->irq_flags = SA_SHIRQ;
3111
3112                 info->init_error = -1; /* assume error, set to 0 on successful init */
3113         }
3114
3115         return info;
3116 }
3117
3118 static void device_init(int adapter_num, struct pci_dev *pdev)
3119 {
3120         struct slgt_info *port_array[SLGT_MAX_PORTS];
3121         int i;
3122         int port_count = 1;
3123
3124         if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3125                 port_count = 4;
3126
3127         /* allocate device instances for all ports */
3128         for (i=0; i < port_count; ++i) {
3129                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3130                 if (port_array[i] == NULL) {
3131                         for (--i; i >= 0; --i)
3132                                 kfree(port_array[i]);
3133                         return;
3134                 }
3135         }
3136
3137         /* give copy of port_array to all ports and add to device list  */
3138         for (i=0; i < port_count; ++i) {
3139                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3140                 add_device(port_array[i]);
3141                 port_array[i]->port_count = port_count;
3142                 spin_lock_init(&port_array[i]->lock);
3143         }
3144
3145         /* Allocate and claim adapter resources */
3146         if (!claim_resources(port_array[0])) {
3147
3148                 alloc_dma_bufs(port_array[0]);
3149
3150                 /* copy resource information from first port to others */
3151                 for (i = 1; i < port_count; ++i) {
3152                         port_array[i]->lock      = port_array[0]->lock;
3153                         port_array[i]->irq_level = port_array[0]->irq_level;
3154                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3155                         alloc_dma_bufs(port_array[i]);
3156                 }
3157
3158                 if (request_irq(port_array[0]->irq_level,
3159                                         slgt_interrupt,
3160                                         port_array[0]->irq_flags,
3161                                         port_array[0]->device_name,
3162                                         port_array[0]) < 0) {
3163                         DBGERR(("%s request_irq failed IRQ=%d\n",
3164                                 port_array[0]->device_name,
3165                                 port_array[0]->irq_level));
3166                 } else {
3167                         port_array[0]->irq_requested = 1;
3168                         adapter_test(port_array[0]);
3169                         for (i=1 ; i < port_count ; i++)
3170                                 port_array[i]->init_error = port_array[0]->init_error;
3171                 }
3172         }
3173 }
3174
3175 static int __devinit init_one(struct pci_dev *dev,
3176                               const struct pci_device_id *ent)
3177 {
3178         if (pci_enable_device(dev)) {
3179                 printk("error enabling pci device %p\n", dev);
3180                 return -EIO;
3181         }
3182         pci_set_master(dev);
3183         device_init(slgt_device_count, dev);
3184         return 0;
3185 }
3186
3187 static void __devexit remove_one(struct pci_dev *dev)
3188 {
3189 }
3190
3191 static struct tty_operations ops = {
3192         .open = open,
3193         .close = close,
3194         .write = write,
3195         .put_char = put_char,
3196         .flush_chars = flush_chars,
3197         .write_room = write_room,
3198         .chars_in_buffer = chars_in_buffer,
3199         .flush_buffer = flush_buffer,
3200         .ioctl = ioctl,
3201         .throttle = throttle,
3202         .unthrottle = unthrottle,
3203         .send_xchar = send_xchar,
3204         .break_ctl = set_break,
3205         .wait_until_sent = wait_until_sent,
3206         .read_proc = read_proc,
3207         .set_termios = set_termios,
3208         .stop = tx_hold,
3209         .start = tx_release,
3210         .hangup = hangup,
3211         .tiocmget = tiocmget,
3212         .tiocmset = tiocmset,
3213 };
3214
3215 static void slgt_cleanup(void)
3216 {
3217         int rc;
3218         struct slgt_info *info;
3219         struct slgt_info *tmp;
3220
3221         printk("unload %s %s\n", driver_name, driver_version);
3222
3223         if (serial_driver) {
3224                 if ((rc = tty_unregister_driver(serial_driver)))
3225                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3226                 put_tty_driver(serial_driver);
3227         }
3228
3229         /* reset devices */
3230         info = slgt_device_list;
3231         while(info) {
3232                 reset_port(info);
3233                 info = info->next_device;
3234         }
3235
3236         /* release devices */
3237         info = slgt_device_list;
3238         while(info) {
3239 #ifdef CONFIG_HDLC
3240                 hdlcdev_exit(info);
3241 #endif
3242                 free_dma_bufs(info);
3243                 free_tmp_rbuf(info);
3244                 if (info->port_num == 0)
3245                         release_resources(info);
3246                 tmp = info;
3247                 info = info->next_device;
3248                 kfree(tmp);
3249         }
3250
3251         if (pci_registered)
3252                 pci_unregister_driver(&pci_driver);
3253 }
3254
3255 /*
3256  *  Driver initialization entry point.
3257  */
3258 static int __init slgt_init(void)
3259 {
3260         int rc;
3261
3262         printk("%s %s\n", driver_name, driver_version);
3263
3264         slgt_device_count = 0;
3265         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3266                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3267                 return rc;
3268         }
3269         pci_registered = 1;
3270
3271         if (!slgt_device_list) {
3272                 printk("%s no devices found\n",driver_name);
3273                 return -ENODEV;
3274         }
3275
3276         serial_driver = alloc_tty_driver(MAX_DEVICES);
3277         if (!serial_driver) {
3278                 rc = -ENOMEM;
3279                 goto error;
3280         }
3281
3282         /* Initialize the tty_driver structure */
3283
3284         serial_driver->owner = THIS_MODULE;
3285         serial_driver->driver_name = tty_driver_name;
3286         serial_driver->name = tty_dev_prefix;
3287         serial_driver->major = ttymajor;
3288         serial_driver->minor_start = 64;
3289         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3290         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3291         serial_driver->init_termios = tty_std_termios;
3292         serial_driver->init_termios.c_cflag =
3293                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3294         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3295         tty_set_operations(serial_driver, &ops);
3296         if ((rc = tty_register_driver(serial_driver)) < 0) {
3297                 DBGERR(("%s can't register serial driver\n", driver_name));
3298                 put_tty_driver(serial_driver);
3299                 serial_driver = NULL;
3300                 goto error;
3301         }
3302
3303         printk("%s %s, tty major#%d\n",
3304                 driver_name, driver_version,
3305                 serial_driver->major);
3306
3307         return 0;
3308
3309 error:
3310         slgt_cleanup();
3311         return rc;
3312 }
3313
3314 static void __exit slgt_exit(void)
3315 {
3316         slgt_cleanup();
3317 }
3318
3319 module_init(slgt_init);
3320 module_exit(slgt_exit);
3321
3322 /*
3323  * register access routines
3324  */
3325
3326 #define CALC_REGADDR() \
3327         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3328         if (addr >= 0x80) \
3329                 reg_addr += (info->port_num) * 32;
3330
3331 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3332 {
3333         CALC_REGADDR();
3334         return readb((void __iomem *)reg_addr);
3335 }
3336
3337 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3338 {
3339         CALC_REGADDR();
3340         writeb(value, (void __iomem *)reg_addr);
3341 }
3342
3343 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3344 {
3345         CALC_REGADDR();
3346         return readw((void __iomem *)reg_addr);
3347 }
3348
3349 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3350 {
3351         CALC_REGADDR();
3352         writew(value, (void __iomem *)reg_addr);
3353 }
3354
3355 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3356 {
3357         CALC_REGADDR();
3358         return readl((void __iomem *)reg_addr);
3359 }
3360
3361 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3362 {
3363         CALC_REGADDR();
3364         writel(value, (void __iomem *)reg_addr);
3365 }
3366
3367 static void rdma_reset(struct slgt_info *info)
3368 {
3369         unsigned int i;
3370
3371         /* set reset bit */
3372         wr_reg32(info, RDCSR, BIT1);
3373
3374         /* wait for enable bit cleared */
3375         for(i=0 ; i < 1000 ; i++)
3376                 if (!(rd_reg32(info, RDCSR) & BIT0))
3377                         break;
3378 }
3379
3380 static void tdma_reset(struct slgt_info *info)
3381 {
3382         unsigned int i;
3383
3384         /* set reset bit */
3385         wr_reg32(info, TDCSR, BIT1);
3386
3387         /* wait for enable bit cleared */
3388         for(i=0 ; i < 1000 ; i++)
3389                 if (!(rd_reg32(info, TDCSR) & BIT0))
3390                         break;
3391 }
3392
3393 /*
3394  * enable internal loopback
3395  * TxCLK and RxCLK are generated from BRG
3396  * and TxD is looped back to RxD internally.
3397  */
3398 static void enable_loopback(struct slgt_info *info)
3399 {
3400         /* SCR (serial control) BIT2=looopback enable */
3401         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3402
3403         if (info->params.mode != MGSL_MODE_ASYNC) {
3404                 /* CCR (clock control)
3405                  * 07..05  tx clock source (010 = BRG)
3406                  * 04..02  rx clock source (010 = BRG)
3407                  * 01      auxclk enable   (0 = disable)
3408                  * 00      BRG enable      (1 = enable)
3409                  *
3410                  * 0100 1001
3411                  */
3412                 wr_reg8(info, CCR, 0x49);
3413
3414                 /* set speed if available, otherwise use default */
3415                 if (info->params.clock_speed)
3416                         set_rate(info, info->params.clock_speed);
3417                 else
3418                         set_rate(info, 3686400);
3419         }
3420 }
3421
3422 /*
3423  *  set baud rate generator to specified rate
3424  */
3425 static void set_rate(struct slgt_info *info, u32 rate)
3426 {
3427         unsigned int div;
3428         static unsigned int osc = 14745600;
3429
3430         /* div = osc/rate - 1
3431          *
3432          * Round div up if osc/rate is not integer to
3433          * force to next slowest rate.
3434          */
3435
3436         if (rate) {
3437                 div = osc/rate;
3438                 if (!(osc % rate) && div)
3439                         div--;
3440                 wr_reg16(info, BDR, (unsigned short)div);
3441         }
3442 }
3443
3444 static void rx_stop(struct slgt_info *info)
3445 {
3446         unsigned short val;
3447
3448         /* disable and reset receiver */
3449         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3450         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3451         wr_reg16(info, RCR, val);                  /* clear reset bit */
3452
3453         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3454
3455         /* clear pending rx interrupts */
3456         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3457
3458         rdma_reset(info);
3459
3460         info->rx_enabled = 0;
3461         info->rx_restart = 0;
3462 }
3463
3464 static void rx_start(struct slgt_info *info)
3465 {
3466         unsigned short val;
3467
3468         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3469
3470         /* clear pending rx overrun IRQ */
3471         wr_reg16(info, SSR, IRQ_RXOVER);
3472
3473         /* reset and disable receiver */
3474         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3475         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3476         wr_reg16(info, RCR, val);                  /* clear reset bit */
3477
3478         rdma_reset(info);
3479         reset_rbufs(info);
3480
3481         /* set 1st descriptor address */
3482         wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3483
3484         if (info->params.mode != MGSL_MODE_ASYNC) {
3485                 /* enable rx DMA and DMA interrupt */
3486                 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3487         } else {
3488                 /* enable saving of rx status, rx DMA and DMA interrupt */
3489                 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3490         }
3491
3492         slgt_irq_on(info, IRQ_RXOVER);
3493
3494         /* enable receiver */
3495         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3496
3497         info->rx_restart = 0;
3498         info->rx_enabled = 1;
3499 }
3500
3501 static void tx_start(struct slgt_info *info)
3502 {
3503         if (!info->tx_enabled) {
3504                 wr_reg16(info, TCR,
3505                         (unsigned short)(rd_reg16(info, TCR) | BIT1));
3506                 info->tx_enabled = TRUE;
3507         }
3508
3509         if (info->tx_count) {
3510                 info->drop_rts_on_tx_done = 0;
3511
3512                 if (info->params.mode != MGSL_MODE_ASYNC) {
3513                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3514                                 get_signals(info);
3515                                 if (!(info->signals & SerialSignal_RTS)) {
3516                                         info->signals |= SerialSignal_RTS;
3517                                         set_signals(info);
3518                                         info->drop_rts_on_tx_done = 1;
3519                                 }
3520                         }
3521
3522                         slgt_irq_off(info, IRQ_TXDATA);
3523                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3524                         /* clear tx idle and underrun status bits */
3525                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3526
3527                         if (!(rd_reg32(info, TDCSR) & BIT0)) {
3528                                 /* tx DMA stopped, restart tx DMA */
3529                                 tdma_reset(info);
3530                                 /* set 1st descriptor address */
3531                                 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3532                                 if (info->params.mode == MGSL_MODE_RAW)
3533                                         wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3534                                 else
3535                                         wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3536                         }
3537
3538                         if (info->params.mode != MGSL_MODE_RAW) {
3539                                 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
3540                                 add_timer(&info->tx_timer);
3541                         }
3542                 } else {
3543                         tdma_reset(info);
3544                         /* set 1st descriptor address */
3545                         wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3546
3547                         slgt_irq_off(info, IRQ_TXDATA);
3548                         slgt_irq_on(info, IRQ_TXIDLE);
3549                         /* clear tx idle status bit */
3550                         wr_reg16(info, SSR, IRQ_TXIDLE);
3551
3552                         /* enable tx DMA */
3553                         wr_reg32(info, TDCSR, BIT0);
3554                 }
3555
3556                 info->tx_active = 1;
3557         }
3558 }
3559
3560 static void tx_stop(struct slgt_info *info)
3561 {
3562         unsigned short val;
3563
3564         del_timer(&info->tx_timer);
3565
3566         tdma_reset(info);
3567
3568         /* reset and disable transmitter */
3569         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
3570         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3571         wr_reg16(info, TCR, val);                  /* clear reset */
3572
3573         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3574
3575         /* clear tx idle and underrun status bit */
3576         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3577
3578         reset_tbufs(info);
3579
3580         info->tx_enabled = 0;
3581         info->tx_active  = 0;
3582 }
3583
3584 static void reset_port(struct slgt_info *info)
3585 {
3586         if (!info->reg_addr)
3587                 return;
3588
3589         tx_stop(info);
3590         rx_stop(info);
3591
3592         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3593         set_signals(info);
3594
3595         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3596 }
3597
3598 static void reset_adapter(struct slgt_info *info)
3599 {
3600         int i;
3601         for (i=0; i < info->port_count; ++i) {
3602                 if (info->port_array[i])
3603                         reset_port(info->port_array[i]);
3604         }
3605 }
3606
3607 static void async_mode(struct slgt_info *info)
3608 {
3609         unsigned short val;
3610
3611         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3612         tx_stop(info);
3613         rx_stop(info);
3614
3615         /* TCR (tx control)
3616          *
3617          * 15..13  mode, 010=async
3618          * 12..10  encoding, 000=NRZ
3619          * 09      parity enable
3620          * 08      1=odd parity, 0=even parity
3621          * 07      1=RTS driver control
3622          * 06      1=break enable
3623          * 05..04  character length
3624          *         00=5 bits
3625          *         01=6 bits
3626          *         10=7 bits
3627          *         11=8 bits
3628          * 03      0=1 stop bit, 1=2 stop bits
3629          * 02      reset
3630          * 01      enable
3631          * 00      auto-CTS enable
3632          */
3633         val = 0x4000;
3634
3635         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
3636                 val |= BIT7;
3637
3638         if (info->params.parity != ASYNC_PARITY_NONE) {
3639                 val |= BIT9;
3640                 if (info->params.parity == ASYNC_PARITY_ODD)
3641                         val |= BIT8;
3642         }
3643
3644         switch (info->params.data_bits)
3645         {
3646         case 6: val |= BIT4; break;
3647         case 7: val |= BIT5; break;
3648         case 8: val |= BIT5 + BIT4; break;
3649         }
3650
3651         if (info->params.stop_bits != 1)
3652                 val |= BIT3;
3653
3654         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3655                 val |= BIT0;
3656
3657         wr_reg16(info, TCR, val);
3658
3659         /* RCR (rx control)
3660          *
3661          * 15..13  mode, 010=async
3662          * 12..10  encoding, 000=NRZ
3663          * 09      parity enable
3664          * 08      1=odd parity, 0=even parity
3665          * 07..06  reserved, must be 0
3666          * 05..04  character length
3667          *         00=5 bits
3668          *         01=6 bits
3669          *         10=7 bits
3670          *         11=8 bits
3671          * 03      reserved, must be zero
3672          * 02      reset
3673          * 01      enable
3674          * 00      auto-DCD enable
3675          */
3676         val = 0x4000;
3677
3678         if (info->params.parity != ASYNC_PARITY_NONE) {
3679                 val |= BIT9;
3680                 if (info->params.parity == ASYNC_PARITY_ODD)
3681                         val |= BIT8;
3682         }
3683
3684         switch (info->params.data_bits)
3685         {
3686         case 6: val |= BIT4; break;
3687         case 7: val |= BIT5; break;
3688         case 8: val |= BIT5 + BIT4; break;
3689         }
3690
3691         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3692                 val |= BIT0;
3693
3694         wr_reg16(info, RCR, val);
3695
3696         /* CCR (clock control)
3697          *
3698          * 07..05  011 = tx clock source is BRG/16
3699          * 04..02  010 = rx clock source is BRG
3700          * 01      0 = auxclk disabled
3701          * 00      1 = BRG enabled
3702          *
3703          * 0110 1001
3704          */
3705         wr_reg8(info, CCR, 0x69);
3706
3707         msc_set_vcr(info);
3708
3709         tx_set_idle(info);
3710
3711         /* SCR (serial control)
3712          *
3713          * 15  1=tx req on FIFO half empty
3714          * 14  1=rx req on FIFO half full
3715          * 13  tx data  IRQ enable
3716          * 12  tx idle  IRQ enable
3717          * 11  rx break on IRQ enable
3718          * 10  rx data  IRQ enable
3719          * 09  rx break off IRQ enable
3720          * 08  overrun  IRQ enable
3721          * 07  DSR      IRQ enable
3722          * 06  CTS      IRQ enable
3723          * 05  DCD      IRQ enable
3724          * 04  RI       IRQ enable
3725          * 03  reserved, must be zero
3726          * 02  1=txd->rxd internal loopback enable
3727          * 01  reserved, must be zero
3728          * 00  1=master IRQ enable
3729          */
3730         val = BIT15 + BIT14 + BIT0;
3731         wr_reg16(info, SCR, val);
3732
3733         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
3734
3735         set_rate(info, info->params.data_rate * 16);
3736
3737         if (info->params.loopback)
3738                 enable_loopback(info);
3739 }
3740
3741 static void hdlc_mode(struct slgt_info *info)
3742 {
3743         unsigned short val;
3744
3745         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3746         tx_stop(info);
3747         rx_stop(info);
3748
3749         /* TCR (tx control)
3750          *
3751          * 15..13  mode, 000=HDLC 001=raw sync
3752          * 12..10  encoding
3753          * 09      CRC enable
3754          * 08      CRC32
3755          * 07      1=RTS driver control
3756          * 06      preamble enable
3757          * 05..04  preamble length
3758          * 03      share open/close flag
3759          * 02      reset
3760          * 01      enable
3761          * 00      auto-CTS enable
3762          */
3763         val = 0;
3764
3765         if (info->params.mode == MGSL_MODE_RAW)
3766                 val |= BIT13;
3767         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
3768                 val |= BIT7;
3769
3770         switch(info->params.encoding)
3771         {
3772         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
3773         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
3774         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
3775         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
3776         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
3777         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
3778         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
3779         }
3780
3781         switch (info->params.crc_type)
3782         {
3783         case HDLC_CRC_16_CCITT: val |= BIT9; break;
3784         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
3785         }
3786
3787         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3788                 val |= BIT6;
3789
3790         switch (info->params.preamble_length)
3791         {
3792         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
3793         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
3794         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
3795         }
3796
3797         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3798                 val |= BIT0;
3799
3800         wr_reg16(info, TCR, val);
3801
3802         /* TPR (transmit preamble) */
3803
3804         switch (info->params.preamble)
3805         {
3806         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3807         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
3808         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
3809         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
3810         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
3811         default:                          val = 0x7e; break;
3812         }
3813         wr_reg8(info, TPR, (unsigned char)val);
3814
3815         /* RCR (rx control)
3816          *
3817          * 15..13  mode, 000=HDLC 001=raw sync
3818          * 12..10  encoding
3819          * 09      CRC enable
3820          * 08      CRC32
3821          * 07..03  reserved, must be 0
3822          * 02      reset
3823          * 01      enable
3824          * 00      auto-DCD enable
3825          */
3826         val = 0;
3827
3828         if (info->params.mode == MGSL_MODE_RAW)
3829                 val |= BIT13;
3830
3831         switch(info->params.encoding)
3832         {
3833         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
3834         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
3835         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
3836         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
3837         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
3838         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
3839         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
3840         }
3841
3842         switch (info->params.crc_type)
3843         {
3844         case HDLC_CRC_16_CCITT: val |= BIT9; break;
3845         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
3846         }
3847
3848         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3849                 val |= BIT0;
3850
3851         wr_reg16(info, RCR, val);
3852
3853         /* CCR (clock control)
3854          *
3855          * 07..05  tx clock source
3856          * 04..02  rx clock source
3857          * 01      auxclk enable
3858          * 00      BRG enable
3859          */
3860         val = 0;
3861
3862         if (info->params.flags & HDLC_FLAG_TXC_BRG)
3863         {
3864                 // when RxC source is DPLL, BRG generates 16X DPLL
3865                 // reference clock, so take TxC from BRG/16 to get
3866                 // transmit clock at actual data rate
3867                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3868                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
3869                 else
3870                         val |= BIT6;    /* 010, txclk = BRG */
3871         }
3872         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
3873                 val |= BIT7;    /* 100, txclk = DPLL Input */
3874         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
3875                 val |= BIT5;    /* 001, txclk = RXC Input */
3876
3877         if (info->params.flags & HDLC_FLAG_RXC_BRG)
3878                 val |= BIT3;    /* 010, rxclk = BRG */
3879         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3880                 val |= BIT4;    /* 100, rxclk = DPLL */
3881         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
3882                 val |= BIT2;    /* 001, rxclk = TXC Input */
3883
3884         if (info->params.clock_speed)
3885                 val |= BIT1 + BIT0;
3886
3887         wr_reg8(info, CCR, (unsigned char)val);
3888
3889         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
3890         {
3891                 // program DPLL mode
3892                 switch(info->params.encoding)
3893                 {
3894                 case HDLC_ENCODING_BIPHASE_MARK:
3895                 case HDLC_ENCODING_BIPHASE_SPACE:
3896                         val = BIT7; break;
3897                 case HDLC_ENCODING_BIPHASE_LEVEL:
3898                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
3899                         val = BIT7 + BIT6; break;
3900                 default: val = BIT6;    // NRZ encodings
3901                 }
3902                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
3903
3904                 // DPLL requires a 16X reference clock from BRG
3905                 set_rate(info, info->params.clock_speed * 16);
3906         }
3907         else
3908                 set_rate(info, info->params.clock_speed);
3909
3910         tx_set_idle(info);
3911
3912         msc_set_vcr(info);
3913
3914         /* SCR (serial control)
3915          *
3916          * 15  1=tx req on FIFO half empty
3917          * 14  1=rx req on FIFO half full
3918          * 13  tx data  IRQ enable
3919          * 12  tx idle  IRQ enable
3920          * 11  underrun IRQ enable
3921          * 10  rx data  IRQ enable
3922          * 09  rx idle  IRQ enable
3923          * 08  overrun  IRQ enable
3924          * 07  DSR      IRQ enable
3925          * 06  CTS      IRQ enable
3926          * 05  DCD      IRQ enable
3927          * 04  RI       IRQ enable
3928          * 03  reserved, must be zero
3929          * 02  1=txd->rxd internal loopback enable
3930          * 01  reserved, must be zero
3931