synclink_gt(): fix compat_ioctl()
[muen/linux.git] / drivers / tty / synclink_gt.c
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * Device driver for Microgate SyncLink GT serial adapters.
4  *
5  * written by Paul Fulghum for Microgate Corporation
6  * paulkf@microgate.com
7  *
8  * Microgate and SyncLink are trademarks of Microgate Corporation
9  *
10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20  * OF THE POSSIBILITY OF SUCH DAMAGE.
21  */
22
23 /*
24  * DEBUG OUTPUT DEFINITIONS
25  *
26  * uncomment lines below to enable specific types of debug output
27  *
28  * DBGINFO   information - most verbose output
29  * DBGERR    serious errors
30  * DBGBH     bottom half service routine debugging
31  * DBGISR    interrupt service routine debugging
32  * DBGDATA   output receive and transmit data
33  * DBGTBUF   output transmit DMA buffers and registers
34  * DBGRBUF   output receive DMA buffers and registers
35  */
36
37 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42 /*#define DBGTBUF(info) dump_tbufs(info)*/
43 /*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46 #include <linux/module.h>
47 #include <linux/errno.h>
48 #include <linux/signal.h>
49 #include <linux/sched.h>
50 #include <linux/timer.h>
51 #include <linux/interrupt.h>
52 #include <linux/pci.h>
53 #include <linux/tty.h>
54 #include <linux/tty_flip.h>
55 #include <linux/serial.h>
56 #include <linux/major.h>
57 #include <linux/string.h>
58 #include <linux/fcntl.h>
59 #include <linux/ptrace.h>
60 #include <linux/ioport.h>
61 #include <linux/mm.h>
62 #include <linux/seq_file.h>
63 #include <linux/slab.h>
64 #include <linux/netdevice.h>
65 #include <linux/vmalloc.h>
66 #include <linux/init.h>
67 #include <linux/delay.h>
68 #include <linux/ioctl.h>
69 #include <linux/termios.h>
70 #include <linux/bitops.h>
71 #include <linux/workqueue.h>
72 #include <linux/hdlc.h>
73 #include <linux/synclink.h>
74
75 #include <asm/io.h>
76 #include <asm/irq.h>
77 #include <asm/dma.h>
78 #include <asm/types.h>
79 #include <linux/uaccess.h>
80
81 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82 #define SYNCLINK_GENERIC_HDLC 1
83 #else
84 #define SYNCLINK_GENERIC_HDLC 0
85 #endif
86
87 /*
88  * module identification
89  */
90 static char *driver_name     = "SyncLink GT";
91 static char *slgt_driver_name = "synclink_gt";
92 static char *tty_dev_prefix  = "ttySLG";
93 MODULE_LICENSE("GPL");
94 #define MGSL_MAGIC 0x5401
95 #define MAX_DEVICES 32
96
97 static const struct pci_device_id pci_table[] = {
98         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
99         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102         {0,}, /* terminate list */
103 };
104 MODULE_DEVICE_TABLE(pci, pci_table);
105
106 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
107 static void remove_one(struct pci_dev *dev);
108 static struct pci_driver pci_driver = {
109         .name           = "synclink_gt",
110         .id_table       = pci_table,
111         .probe          = init_one,
112         .remove         = remove_one,
113 };
114
115 static bool pci_registered;
116
117 /*
118  * module configuration and status
119  */
120 static struct slgt_info *slgt_device_list;
121 static int slgt_device_count;
122
123 static int ttymajor;
124 static int debug_level;
125 static int maxframe[MAX_DEVICES];
126
127 module_param(ttymajor, int, 0);
128 module_param(debug_level, int, 0);
129 module_param_array(maxframe, int, NULL, 0);
130
131 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
132 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
133 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
134
135 /*
136  * tty support and callbacks
137  */
138 static struct tty_driver *serial_driver;
139
140 static int  open(struct tty_struct *tty, struct file * filp);
141 static void close(struct tty_struct *tty, struct file * filp);
142 static void hangup(struct tty_struct *tty);
143 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
144
145 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
146 static int put_char(struct tty_struct *tty, unsigned char ch);
147 static void send_xchar(struct tty_struct *tty, char ch);
148 static void wait_until_sent(struct tty_struct *tty, int timeout);
149 static int  write_room(struct tty_struct *tty);
150 static void flush_chars(struct tty_struct *tty);
151 static void flush_buffer(struct tty_struct *tty);
152 static void tx_hold(struct tty_struct *tty);
153 static void tx_release(struct tty_struct *tty);
154
155 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
156 static int  chars_in_buffer(struct tty_struct *tty);
157 static void throttle(struct tty_struct * tty);
158 static void unthrottle(struct tty_struct * tty);
159 static int set_break(struct tty_struct *tty, int break_state);
160
161 /*
162  * generic HDLC support and callbacks
163  */
164 #if SYNCLINK_GENERIC_HDLC
165 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
166 static void hdlcdev_tx_done(struct slgt_info *info);
167 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
168 static int  hdlcdev_init(struct slgt_info *info);
169 static void hdlcdev_exit(struct slgt_info *info);
170 #endif
171
172
173 /*
174  * device specific structures, macros and functions
175  */
176
177 #define SLGT_MAX_PORTS 4
178 #define SLGT_REG_SIZE  256
179
180 /*
181  * conditional wait facility
182  */
183 struct cond_wait {
184         struct cond_wait *next;
185         wait_queue_head_t q;
186         wait_queue_entry_t wait;
187         unsigned int data;
188 };
189 static void init_cond_wait(struct cond_wait *w, unsigned int data);
190 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
191 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
192 static void flush_cond_wait(struct cond_wait **head);
193
194 /*
195  * DMA buffer descriptor and access macros
196  */
197 struct slgt_desc
198 {
199         __le16 count;
200         __le16 status;
201         __le32 pbuf;  /* physical address of data buffer */
202         __le32 next;  /* physical address of next descriptor */
203
204         /* driver book keeping */
205         char *buf;          /* virtual  address of data buffer */
206         unsigned int pdesc; /* physical address of this descriptor */
207         dma_addr_t buf_dma_addr;
208         unsigned short buf_count;
209 };
210
211 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
212 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
213 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
214 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
215 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
216 #define desc_count(a)      (le16_to_cpu((a).count))
217 #define desc_status(a)     (le16_to_cpu((a).status))
218 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
219 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
220 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
221 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
222 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
223
224 struct _input_signal_events {
225         int ri_up;
226         int ri_down;
227         int dsr_up;
228         int dsr_down;
229         int dcd_up;
230         int dcd_down;
231         int cts_up;
232         int cts_down;
233 };
234
235 /*
236  * device instance data structure
237  */
238 struct slgt_info {
239         void *if_ptr;           /* General purpose pointer (used by SPPP) */
240         struct tty_port port;
241
242         struct slgt_info *next_device;  /* device list link */
243
244         int magic;
245
246         char device_name[25];
247         struct pci_dev *pdev;
248
249         int port_count;  /* count of ports on adapter */
250         int adapter_num; /* adapter instance number */
251         int port_num;    /* port instance number */
252
253         /* array of pointers to port contexts on this adapter */
254         struct slgt_info *port_array[SLGT_MAX_PORTS];
255
256         int                     line;           /* tty line instance number */
257
258         struct mgsl_icount      icount;
259
260         int                     timeout;
261         int                     x_char;         /* xon/xoff character */
262         unsigned int            read_status_mask;
263         unsigned int            ignore_status_mask;
264
265         wait_queue_head_t       status_event_wait_q;
266         wait_queue_head_t       event_wait_q;
267         struct timer_list       tx_timer;
268         struct timer_list       rx_timer;
269
270         unsigned int            gpio_present;
271         struct cond_wait        *gpio_wait_q;
272
273         spinlock_t lock;        /* spinlock for synchronizing with ISR */
274
275         struct work_struct task;
276         u32 pending_bh;
277         bool bh_requested;
278         bool bh_running;
279
280         int isr_overflow;
281         bool irq_requested;     /* true if IRQ requested */
282         bool irq_occurred;      /* for diagnostics use */
283
284         /* device configuration */
285
286         unsigned int bus_type;
287         unsigned int irq_level;
288         unsigned long irq_flags;
289
290         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
291         u32 phys_reg_addr;
292         bool reg_addr_requested;
293
294         MGSL_PARAMS params;       /* communications parameters */
295         u32 idle_mode;
296         u32 max_frame_size;       /* as set by device config */
297
298         unsigned int rbuf_fill_level;
299         unsigned int rx_pio;
300         unsigned int if_mode;
301         unsigned int base_clock;
302         unsigned int xsync;
303         unsigned int xctrl;
304
305         /* device status */
306
307         bool rx_enabled;
308         bool rx_restart;
309
310         bool tx_enabled;
311         bool tx_active;
312
313         unsigned char signals;    /* serial signal states */
314         int init_error;  /* initialization error */
315
316         unsigned char *tx_buf;
317         int tx_count;
318
319         char *flag_buf;
320         bool drop_rts_on_tx_done;
321         struct  _input_signal_events    input_signal_events;
322
323         int dcd_chkcount;       /* check counts to prevent */
324         int cts_chkcount;       /* too many IRQs if a signal */
325         int dsr_chkcount;       /* is floating */
326         int ri_chkcount;
327
328         char *bufs;             /* virtual address of DMA buffer lists */
329         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
330
331         unsigned int rbuf_count;
332         struct slgt_desc *rbufs;
333         unsigned int rbuf_current;
334         unsigned int rbuf_index;
335         unsigned int rbuf_fill_index;
336         unsigned short rbuf_fill_count;
337
338         unsigned int tbuf_count;
339         struct slgt_desc *tbufs;
340         unsigned int tbuf_current;
341         unsigned int tbuf_start;
342
343         unsigned char *tmp_rbuf;
344         unsigned int tmp_rbuf_count;
345
346         /* SPPP/Cisco HDLC device parts */
347
348         int netcount;
349         spinlock_t netlock;
350 #if SYNCLINK_GENERIC_HDLC
351         struct net_device *netdev;
352 #endif
353
354 };
355
356 static MGSL_PARAMS default_params = {
357         .mode            = MGSL_MODE_HDLC,
358         .loopback        = 0,
359         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
360         .encoding        = HDLC_ENCODING_NRZI_SPACE,
361         .clock_speed     = 0,
362         .addr_filter     = 0xff,
363         .crc_type        = HDLC_CRC_16_CCITT,
364         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
365         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
366         .data_rate       = 9600,
367         .data_bits       = 8,
368         .stop_bits       = 1,
369         .parity          = ASYNC_PARITY_NONE
370 };
371
372
373 #define BH_RECEIVE  1
374 #define BH_TRANSMIT 2
375 #define BH_STATUS   4
376 #define IO_PIN_SHUTDOWN_LIMIT 100
377
378 #define DMABUFSIZE 256
379 #define DESC_LIST_SIZE 4096
380
381 #define MASK_PARITY  BIT1
382 #define MASK_FRAMING BIT0
383 #define MASK_BREAK   BIT14
384 #define MASK_OVERRUN BIT4
385
386 #define GSR   0x00 /* global status */
387 #define JCR   0x04 /* JTAG control */
388 #define IODR  0x08 /* GPIO direction */
389 #define IOER  0x0c /* GPIO interrupt enable */
390 #define IOVR  0x10 /* GPIO value */
391 #define IOSR  0x14 /* GPIO interrupt status */
392 #define TDR   0x80 /* tx data */
393 #define RDR   0x80 /* rx data */
394 #define TCR   0x82 /* tx control */
395 #define TIR   0x84 /* tx idle */
396 #define TPR   0x85 /* tx preamble */
397 #define RCR   0x86 /* rx control */
398 #define VCR   0x88 /* V.24 control */
399 #define CCR   0x89 /* clock control */
400 #define BDR   0x8a /* baud divisor */
401 #define SCR   0x8c /* serial control */
402 #define SSR   0x8e /* serial status */
403 #define RDCSR 0x90 /* rx DMA control/status */
404 #define TDCSR 0x94 /* tx DMA control/status */
405 #define RDDAR 0x98 /* rx DMA descriptor address */
406 #define TDDAR 0x9c /* tx DMA descriptor address */
407 #define XSR   0x40 /* extended sync pattern */
408 #define XCR   0x44 /* extended control */
409
410 #define RXIDLE      BIT14
411 #define RXBREAK     BIT14
412 #define IRQ_TXDATA  BIT13
413 #define IRQ_TXIDLE  BIT12
414 #define IRQ_TXUNDER BIT11 /* HDLC */
415 #define IRQ_RXDATA  BIT10
416 #define IRQ_RXIDLE  BIT9  /* HDLC */
417 #define IRQ_RXBREAK BIT9  /* async */
418 #define IRQ_RXOVER  BIT8
419 #define IRQ_DSR     BIT7
420 #define IRQ_CTS     BIT6
421 #define IRQ_DCD     BIT5
422 #define IRQ_RI      BIT4
423 #define IRQ_ALL     0x3ff0
424 #define IRQ_MASTER  BIT0
425
426 #define slgt_irq_on(info, mask) \
427         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
428 #define slgt_irq_off(info, mask) \
429         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
430
431 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
432 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
433 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
434 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
435 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
436 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
437
438 static void  msc_set_vcr(struct slgt_info *info);
439
440 static int  startup(struct slgt_info *info);
441 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
442 static void shutdown(struct slgt_info *info);
443 static void program_hw(struct slgt_info *info);
444 static void change_params(struct slgt_info *info);
445
446 static int  register_test(struct slgt_info *info);
447 static int  irq_test(struct slgt_info *info);
448 static int  loopback_test(struct slgt_info *info);
449 static int  adapter_test(struct slgt_info *info);
450
451 static void reset_adapter(struct slgt_info *info);
452 static void reset_port(struct slgt_info *info);
453 static void async_mode(struct slgt_info *info);
454 static void sync_mode(struct slgt_info *info);
455
456 static void rx_stop(struct slgt_info *info);
457 static void rx_start(struct slgt_info *info);
458 static void reset_rbufs(struct slgt_info *info);
459 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
460 static void rdma_reset(struct slgt_info *info);
461 static bool rx_get_frame(struct slgt_info *info);
462 static bool rx_get_buf(struct slgt_info *info);
463
464 static void tx_start(struct slgt_info *info);
465 static void tx_stop(struct slgt_info *info);
466 static void tx_set_idle(struct slgt_info *info);
467 static unsigned int free_tbuf_count(struct slgt_info *info);
468 static unsigned int tbuf_bytes(struct slgt_info *info);
469 static void reset_tbufs(struct slgt_info *info);
470 static void tdma_reset(struct slgt_info *info);
471 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
472
473 static void get_signals(struct slgt_info *info);
474 static void set_signals(struct slgt_info *info);
475 static void enable_loopback(struct slgt_info *info);
476 static void set_rate(struct slgt_info *info, u32 data_rate);
477
478 static int  bh_action(struct slgt_info *info);
479 static void bh_handler(struct work_struct *work);
480 static void bh_transmit(struct slgt_info *info);
481 static void isr_serial(struct slgt_info *info);
482 static void isr_rdma(struct slgt_info *info);
483 static void isr_txeom(struct slgt_info *info, unsigned short status);
484 static void isr_tdma(struct slgt_info *info);
485
486 static int  alloc_dma_bufs(struct slgt_info *info);
487 static void free_dma_bufs(struct slgt_info *info);
488 static int  alloc_desc(struct slgt_info *info);
489 static void free_desc(struct slgt_info *info);
490 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492
493 static int  alloc_tmp_rbuf(struct slgt_info *info);
494 static void free_tmp_rbuf(struct slgt_info *info);
495
496 static void tx_timeout(struct timer_list *t);
497 static void rx_timeout(struct timer_list *t);
498
499 /*
500  * ioctl handlers
501  */
502 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
503 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
504 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
506 static int  set_txidle(struct slgt_info *info, int idle_mode);
507 static int  tx_enable(struct slgt_info *info, int enable);
508 static int  tx_abort(struct slgt_info *info);
509 static int  rx_enable(struct slgt_info *info, int enable);
510 static int  modem_input_wait(struct slgt_info *info,int arg);
511 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
512 static int  tiocmget(struct tty_struct *tty);
513 static int  tiocmset(struct tty_struct *tty,
514                                 unsigned int set, unsigned int clear);
515 static int set_break(struct tty_struct *tty, int break_state);
516 static int  get_interface(struct slgt_info *info, int __user *if_mode);
517 static int  set_interface(struct slgt_info *info, int if_mode);
518 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
519 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int  get_xsync(struct slgt_info *info, int __user *if_mode);
522 static int  set_xsync(struct slgt_info *info, int if_mode);
523 static int  get_xctrl(struct slgt_info *info, int __user *if_mode);
524 static int  set_xctrl(struct slgt_info *info, int if_mode);
525
526 /*
527  * driver functions
528  */
529 static void add_device(struct slgt_info *info);
530 static void device_init(int adapter_num, struct pci_dev *pdev);
531 static int  claim_resources(struct slgt_info *info);
532 static void release_resources(struct slgt_info *info);
533
534 /*
535  * DEBUG OUTPUT CODE
536  */
537 #ifndef DBGINFO
538 #define DBGINFO(fmt)
539 #endif
540 #ifndef DBGERR
541 #define DBGERR(fmt)
542 #endif
543 #ifndef DBGBH
544 #define DBGBH(fmt)
545 #endif
546 #ifndef DBGISR
547 #define DBGISR(fmt)
548 #endif
549
550 #ifdef DBGDATA
551 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
552 {
553         int i;
554         int linecount;
555         printk("%s %s data:\n",info->device_name, label);
556         while(count) {
557                 linecount = (count > 16) ? 16 : count;
558                 for(i=0; i < linecount; i++)
559                         printk("%02X ",(unsigned char)data[i]);
560                 for(;i<17;i++)
561                         printk("   ");
562                 for(i=0;i<linecount;i++) {
563                         if (data[i]>=040 && data[i]<=0176)
564                                 printk("%c",data[i]);
565                         else
566                                 printk(".");
567                 }
568                 printk("\n");
569                 data  += linecount;
570                 count -= linecount;
571         }
572 }
573 #else
574 #define DBGDATA(info, buf, size, label)
575 #endif
576
577 #ifdef DBGTBUF
578 static void dump_tbufs(struct slgt_info *info)
579 {
580         int i;
581         printk("tbuf_current=%d\n", info->tbuf_current);
582         for (i=0 ; i < info->tbuf_count ; i++) {
583                 printk("%d: count=%04X status=%04X\n",
584                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
585         }
586 }
587 #else
588 #define DBGTBUF(info)
589 #endif
590
591 #ifdef DBGRBUF
592 static void dump_rbufs(struct slgt_info *info)
593 {
594         int i;
595         printk("rbuf_current=%d\n", info->rbuf_current);
596         for (i=0 ; i < info->rbuf_count ; i++) {
597                 printk("%d: count=%04X status=%04X\n",
598                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
599         }
600 }
601 #else
602 #define DBGRBUF(info)
603 #endif
604
605 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
606 {
607 #ifdef SANITY_CHECK
608         if (!info) {
609                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
610                 return 1;
611         }
612         if (info->magic != MGSL_MAGIC) {
613                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
614                 return 1;
615         }
616 #else
617         if (!info)
618                 return 1;
619 #endif
620         return 0;
621 }
622
623 /**
624  * line discipline callback wrappers
625  *
626  * The wrappers maintain line discipline references
627  * while calling into the line discipline.
628  *
629  * ldisc_receive_buf  - pass receive data to line discipline
630  */
631 static void ldisc_receive_buf(struct tty_struct *tty,
632                               const __u8 *data, char *flags, int count)
633 {
634         struct tty_ldisc *ld;
635         if (!tty)
636                 return;
637         ld = tty_ldisc_ref(tty);
638         if (ld) {
639                 if (ld->ops->receive_buf)
640                         ld->ops->receive_buf(tty, data, flags, count);
641                 tty_ldisc_deref(ld);
642         }
643 }
644
645 /* tty callbacks */
646
647 static int open(struct tty_struct *tty, struct file *filp)
648 {
649         struct slgt_info *info;
650         int retval, line;
651         unsigned long flags;
652
653         line = tty->index;
654         if (line >= slgt_device_count) {
655                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
656                 return -ENODEV;
657         }
658
659         info = slgt_device_list;
660         while(info && info->line != line)
661                 info = info->next_device;
662         if (sanity_check(info, tty->name, "open"))
663                 return -ENODEV;
664         if (info->init_error) {
665                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
666                 return -ENODEV;
667         }
668
669         tty->driver_data = info;
670         info->port.tty = tty;
671
672         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
673
674         mutex_lock(&info->port.mutex);
675         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
676
677         spin_lock_irqsave(&info->netlock, flags);
678         if (info->netcount) {
679                 retval = -EBUSY;
680                 spin_unlock_irqrestore(&info->netlock, flags);
681                 mutex_unlock(&info->port.mutex);
682                 goto cleanup;
683         }
684         info->port.count++;
685         spin_unlock_irqrestore(&info->netlock, flags);
686
687         if (info->port.count == 1) {
688                 /* 1st open on this device, init hardware */
689                 retval = startup(info);
690                 if (retval < 0) {
691                         mutex_unlock(&info->port.mutex);
692                         goto cleanup;
693                 }
694         }
695         mutex_unlock(&info->port.mutex);
696         retval = block_til_ready(tty, filp, info);
697         if (retval) {
698                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
699                 goto cleanup;
700         }
701
702         retval = 0;
703
704 cleanup:
705         if (retval) {
706                 if (tty->count == 1)
707                         info->port.tty = NULL; /* tty layer will release tty struct */
708                 if(info->port.count)
709                         info->port.count--;
710         }
711
712         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
713         return retval;
714 }
715
716 static void close(struct tty_struct *tty, struct file *filp)
717 {
718         struct slgt_info *info = tty->driver_data;
719
720         if (sanity_check(info, tty->name, "close"))
721                 return;
722         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
723
724         if (tty_port_close_start(&info->port, tty, filp) == 0)
725                 goto cleanup;
726
727         mutex_lock(&info->port.mutex);
728         if (tty_port_initialized(&info->port))
729                 wait_until_sent(tty, info->timeout);
730         flush_buffer(tty);
731         tty_ldisc_flush(tty);
732
733         shutdown(info);
734         mutex_unlock(&info->port.mutex);
735
736         tty_port_close_end(&info->port, tty);
737         info->port.tty = NULL;
738 cleanup:
739         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
740 }
741
742 static void hangup(struct tty_struct *tty)
743 {
744         struct slgt_info *info = tty->driver_data;
745         unsigned long flags;
746
747         if (sanity_check(info, tty->name, "hangup"))
748                 return;
749         DBGINFO(("%s hangup\n", info->device_name));
750
751         flush_buffer(tty);
752
753         mutex_lock(&info->port.mutex);
754         shutdown(info);
755
756         spin_lock_irqsave(&info->port.lock, flags);
757         info->port.count = 0;
758         info->port.tty = NULL;
759         spin_unlock_irqrestore(&info->port.lock, flags);
760         tty_port_set_active(&info->port, 0);
761         mutex_unlock(&info->port.mutex);
762
763         wake_up_interruptible(&info->port.open_wait);
764 }
765
766 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
767 {
768         struct slgt_info *info = tty->driver_data;
769         unsigned long flags;
770
771         DBGINFO(("%s set_termios\n", tty->driver->name));
772
773         change_params(info);
774
775         /* Handle transition to B0 status */
776         if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
777                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
778                 spin_lock_irqsave(&info->lock,flags);
779                 set_signals(info);
780                 spin_unlock_irqrestore(&info->lock,flags);
781         }
782
783         /* Handle transition away from B0 status */
784         if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
785                 info->signals |= SerialSignal_DTR;
786                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
787                         info->signals |= SerialSignal_RTS;
788                 spin_lock_irqsave(&info->lock,flags);
789                 set_signals(info);
790                 spin_unlock_irqrestore(&info->lock,flags);
791         }
792
793         /* Handle turning off CRTSCTS */
794         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
795                 tty->hw_stopped = 0;
796                 tx_release(tty);
797         }
798 }
799
800 static void update_tx_timer(struct slgt_info *info)
801 {
802         /*
803          * use worst case speed of 1200bps to calculate transmit timeout
804          * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
805          */
806         if (info->params.mode == MGSL_MODE_HDLC) {
807                 int timeout  = (tbuf_bytes(info) * 7) + 1000;
808                 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
809         }
810 }
811
812 static int write(struct tty_struct *tty,
813                  const unsigned char *buf, int count)
814 {
815         int ret = 0;
816         struct slgt_info *info = tty->driver_data;
817         unsigned long flags;
818
819         if (sanity_check(info, tty->name, "write"))
820                 return -EIO;
821
822         DBGINFO(("%s write count=%d\n", info->device_name, count));
823
824         if (!info->tx_buf || (count > info->max_frame_size))
825                 return -EIO;
826
827         if (!count || tty->stopped || tty->hw_stopped)
828                 return 0;
829
830         spin_lock_irqsave(&info->lock, flags);
831
832         if (info->tx_count) {
833                 /* send accumulated data from send_char() */
834                 if (!tx_load(info, info->tx_buf, info->tx_count))
835                         goto cleanup;
836                 info->tx_count = 0;
837         }
838
839         if (tx_load(info, buf, count))
840                 ret = count;
841
842 cleanup:
843         spin_unlock_irqrestore(&info->lock, flags);
844         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
845         return ret;
846 }
847
848 static int put_char(struct tty_struct *tty, unsigned char ch)
849 {
850         struct slgt_info *info = tty->driver_data;
851         unsigned long flags;
852         int ret = 0;
853
854         if (sanity_check(info, tty->name, "put_char"))
855                 return 0;
856         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
857         if (!info->tx_buf)
858                 return 0;
859         spin_lock_irqsave(&info->lock,flags);
860         if (info->tx_count < info->max_frame_size) {
861                 info->tx_buf[info->tx_count++] = ch;
862                 ret = 1;
863         }
864         spin_unlock_irqrestore(&info->lock,flags);
865         return ret;
866 }
867
868 static void send_xchar(struct tty_struct *tty, char ch)
869 {
870         struct slgt_info *info = tty->driver_data;
871         unsigned long flags;
872
873         if (sanity_check(info, tty->name, "send_xchar"))
874                 return;
875         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
876         info->x_char = ch;
877         if (ch) {
878                 spin_lock_irqsave(&info->lock,flags);
879                 if (!info->tx_enabled)
880                         tx_start(info);
881                 spin_unlock_irqrestore(&info->lock,flags);
882         }
883 }
884
885 static void wait_until_sent(struct tty_struct *tty, int timeout)
886 {
887         struct slgt_info *info = tty->driver_data;
888         unsigned long orig_jiffies, char_time;
889
890         if (!info )
891                 return;
892         if (sanity_check(info, tty->name, "wait_until_sent"))
893                 return;
894         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
895         if (!tty_port_initialized(&info->port))
896                 goto exit;
897
898         orig_jiffies = jiffies;
899
900         /* Set check interval to 1/5 of estimated time to
901          * send a character, and make it at least 1. The check
902          * interval should also be less than the timeout.
903          * Note: use tight timings here to satisfy the NIST-PCTS.
904          */
905
906         if (info->params.data_rate) {
907                 char_time = info->timeout/(32 * 5);
908                 if (!char_time)
909                         char_time++;
910         } else
911                 char_time = 1;
912
913         if (timeout)
914                 char_time = min_t(unsigned long, char_time, timeout);
915
916         while (info->tx_active) {
917                 msleep_interruptible(jiffies_to_msecs(char_time));
918                 if (signal_pending(current))
919                         break;
920                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
921                         break;
922         }
923 exit:
924         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
925 }
926
927 static int write_room(struct tty_struct *tty)
928 {
929         struct slgt_info *info = tty->driver_data;
930         int ret;
931
932         if (sanity_check(info, tty->name, "write_room"))
933                 return 0;
934         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
935         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
936         return ret;
937 }
938
939 static void flush_chars(struct tty_struct *tty)
940 {
941         struct slgt_info *info = tty->driver_data;
942         unsigned long flags;
943
944         if (sanity_check(info, tty->name, "flush_chars"))
945                 return;
946         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
947
948         if (info->tx_count <= 0 || tty->stopped ||
949             tty->hw_stopped || !info->tx_buf)
950                 return;
951
952         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
953
954         spin_lock_irqsave(&info->lock,flags);
955         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
956                 info->tx_count = 0;
957         spin_unlock_irqrestore(&info->lock,flags);
958 }
959
960 static void flush_buffer(struct tty_struct *tty)
961 {
962         struct slgt_info *info = tty->driver_data;
963         unsigned long flags;
964
965         if (sanity_check(info, tty->name, "flush_buffer"))
966                 return;
967         DBGINFO(("%s flush_buffer\n", info->device_name));
968
969         spin_lock_irqsave(&info->lock, flags);
970         info->tx_count = 0;
971         spin_unlock_irqrestore(&info->lock, flags);
972
973         tty_wakeup(tty);
974 }
975
976 /*
977  * throttle (stop) transmitter
978  */
979 static void tx_hold(struct tty_struct *tty)
980 {
981         struct slgt_info *info = tty->driver_data;
982         unsigned long flags;
983
984         if (sanity_check(info, tty->name, "tx_hold"))
985                 return;
986         DBGINFO(("%s tx_hold\n", info->device_name));
987         spin_lock_irqsave(&info->lock,flags);
988         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
989                 tx_stop(info);
990         spin_unlock_irqrestore(&info->lock,flags);
991 }
992
993 /*
994  * release (start) transmitter
995  */
996 static void tx_release(struct tty_struct *tty)
997 {
998         struct slgt_info *info = tty->driver_data;
999         unsigned long flags;
1000
1001         if (sanity_check(info, tty->name, "tx_release"))
1002                 return;
1003         DBGINFO(("%s tx_release\n", info->device_name));
1004         spin_lock_irqsave(&info->lock, flags);
1005         if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1006                 info->tx_count = 0;
1007         spin_unlock_irqrestore(&info->lock, flags);
1008 }
1009
1010 /*
1011  * Service an IOCTL request
1012  *
1013  * Arguments
1014  *
1015  *      tty     pointer to tty instance data
1016  *      cmd     IOCTL command code
1017  *      arg     command argument/context
1018  *
1019  * Return 0 if success, otherwise error code
1020  */
1021 static int ioctl(struct tty_struct *tty,
1022                  unsigned int cmd, unsigned long arg)
1023 {
1024         struct slgt_info *info = tty->driver_data;
1025         void __user *argp = (void __user *)arg;
1026         int ret;
1027
1028         if (sanity_check(info, tty->name, "ioctl"))
1029                 return -ENODEV;
1030         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1031
1032         if (cmd != TIOCMIWAIT) {
1033                 if (tty_io_error(tty))
1034                     return -EIO;
1035         }
1036
1037         switch (cmd) {
1038         case MGSL_IOCWAITEVENT:
1039                 return wait_mgsl_event(info, argp);
1040         case TIOCMIWAIT:
1041                 return modem_input_wait(info,(int)arg);
1042         case MGSL_IOCSGPIO:
1043                 return set_gpio(info, argp);
1044         case MGSL_IOCGGPIO:
1045                 return get_gpio(info, argp);
1046         case MGSL_IOCWAITGPIO:
1047                 return wait_gpio(info, argp);
1048         case MGSL_IOCGXSYNC:
1049                 return get_xsync(info, argp);
1050         case MGSL_IOCSXSYNC:
1051                 return set_xsync(info, (int)arg);
1052         case MGSL_IOCGXCTRL:
1053                 return get_xctrl(info, argp);
1054         case MGSL_IOCSXCTRL:
1055                 return set_xctrl(info, (int)arg);
1056         }
1057         mutex_lock(&info->port.mutex);
1058         switch (cmd) {
1059         case MGSL_IOCGPARAMS:
1060                 ret = get_params(info, argp);
1061                 break;
1062         case MGSL_IOCSPARAMS:
1063                 ret = set_params(info, argp);
1064                 break;
1065         case MGSL_IOCGTXIDLE:
1066                 ret = get_txidle(info, argp);
1067                 break;
1068         case MGSL_IOCSTXIDLE:
1069                 ret = set_txidle(info, (int)arg);
1070                 break;
1071         case MGSL_IOCTXENABLE:
1072                 ret = tx_enable(info, (int)arg);
1073                 break;
1074         case MGSL_IOCRXENABLE:
1075                 ret = rx_enable(info, (int)arg);
1076                 break;
1077         case MGSL_IOCTXABORT:
1078                 ret = tx_abort(info);
1079                 break;
1080         case MGSL_IOCGSTATS:
1081                 ret = get_stats(info, argp);
1082                 break;
1083         case MGSL_IOCGIF:
1084                 ret = get_interface(info, argp);
1085                 break;
1086         case MGSL_IOCSIF:
1087                 ret = set_interface(info,(int)arg);
1088                 break;
1089         default:
1090                 ret = -ENOIOCTLCMD;
1091         }
1092         mutex_unlock(&info->port.mutex);
1093         return ret;
1094 }
1095
1096 static int get_icount(struct tty_struct *tty,
1097                                 struct serial_icounter_struct *icount)
1098
1099 {
1100         struct slgt_info *info = tty->driver_data;
1101         struct mgsl_icount cnow;        /* kernel counter temps */
1102         unsigned long flags;
1103
1104         spin_lock_irqsave(&info->lock,flags);
1105         cnow = info->icount;
1106         spin_unlock_irqrestore(&info->lock,flags);
1107
1108         icount->cts = cnow.cts;
1109         icount->dsr = cnow.dsr;
1110         icount->rng = cnow.rng;
1111         icount->dcd = cnow.dcd;
1112         icount->rx = cnow.rx;
1113         icount->tx = cnow.tx;
1114         icount->frame = cnow.frame;
1115         icount->overrun = cnow.overrun;
1116         icount->parity = cnow.parity;
1117         icount->brk = cnow.brk;
1118         icount->buf_overrun = cnow.buf_overrun;
1119
1120         return 0;
1121 }
1122
1123 /*
1124  * support for 32 bit ioctl calls on 64 bit systems
1125  */
1126 #ifdef CONFIG_COMPAT
1127 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1128 {
1129         struct MGSL_PARAMS32 tmp_params;
1130
1131         DBGINFO(("%s get_params32\n", info->device_name));
1132         memset(&tmp_params, 0, sizeof(tmp_params));
1133         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1134         tmp_params.loopback        = info->params.loopback;
1135         tmp_params.flags           = info->params.flags;
1136         tmp_params.encoding        = info->params.encoding;
1137         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1138         tmp_params.addr_filter     = info->params.addr_filter;
1139         tmp_params.crc_type        = info->params.crc_type;
1140         tmp_params.preamble_length = info->params.preamble_length;
1141         tmp_params.preamble        = info->params.preamble;
1142         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1143         tmp_params.data_bits       = info->params.data_bits;
1144         tmp_params.stop_bits       = info->params.stop_bits;
1145         tmp_params.parity          = info->params.parity;
1146         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1147                 return -EFAULT;
1148         return 0;
1149 }
1150
1151 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1152 {
1153         struct MGSL_PARAMS32 tmp_params;
1154
1155         DBGINFO(("%s set_params32\n", info->device_name));
1156         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1157                 return -EFAULT;
1158
1159         spin_lock(&info->lock);
1160         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1161                 info->base_clock = tmp_params.clock_speed;
1162         } else {
1163                 info->params.mode            = tmp_params.mode;
1164                 info->params.loopback        = tmp_params.loopback;
1165                 info->params.flags           = tmp_params.flags;
1166                 info->params.encoding        = tmp_params.encoding;
1167                 info->params.clock_speed     = tmp_params.clock_speed;
1168                 info->params.addr_filter     = tmp_params.addr_filter;
1169                 info->params.crc_type        = tmp_params.crc_type;
1170                 info->params.preamble_length = tmp_params.preamble_length;
1171                 info->params.preamble        = tmp_params.preamble;
1172                 info->params.data_rate       = tmp_params.data_rate;
1173                 info->params.data_bits       = tmp_params.data_bits;
1174                 info->params.stop_bits       = tmp_params.stop_bits;
1175                 info->params.parity          = tmp_params.parity;
1176         }
1177         spin_unlock(&info->lock);
1178
1179         program_hw(info);
1180
1181         return 0;
1182 }
1183
1184 static long slgt_compat_ioctl(struct tty_struct *tty,
1185                          unsigned int cmd, unsigned long arg)
1186 {
1187         struct slgt_info *info = tty->driver_data;
1188         int rc;
1189
1190         if (sanity_check(info, tty->name, "compat_ioctl"))
1191                 return -ENODEV;
1192         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1193
1194         switch (cmd) {
1195         case MGSL_IOCSPARAMS32:
1196                 rc = set_params32(info, compat_ptr(arg));
1197                 break;
1198
1199         case MGSL_IOCGPARAMS32:
1200                 rc = get_params32(info, compat_ptr(arg));
1201                 break;
1202
1203         case MGSL_IOCGPARAMS:
1204         case MGSL_IOCSPARAMS:
1205         case MGSL_IOCGTXIDLE:
1206         case MGSL_IOCGSTATS:
1207         case MGSL_IOCWAITEVENT:
1208         case MGSL_IOCGIF:
1209         case MGSL_IOCSGPIO:
1210         case MGSL_IOCGGPIO:
1211         case MGSL_IOCWAITGPIO:
1212         case MGSL_IOCGXSYNC:
1213         case MGSL_IOCGXCTRL:
1214                 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
1215                 break;
1216         default:
1217                 rc = ioctl(tty, cmd, arg);
1218         }
1219         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1220         return rc;
1221 }
1222 #else
1223 #define slgt_compat_ioctl NULL
1224 #endif /* ifdef CONFIG_COMPAT */
1225
1226 /*
1227  * proc fs support
1228  */
1229 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1230 {
1231         char stat_buf[30];
1232         unsigned long flags;
1233
1234         seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1235                       info->device_name, info->phys_reg_addr,
1236                       info->irq_level, info->max_frame_size);
1237
1238         /* output current serial signal states */
1239         spin_lock_irqsave(&info->lock,flags);
1240         get_signals(info);
1241         spin_unlock_irqrestore(&info->lock,flags);
1242
1243         stat_buf[0] = 0;
1244         stat_buf[1] = 0;
1245         if (info->signals & SerialSignal_RTS)
1246                 strcat(stat_buf, "|RTS");
1247         if (info->signals & SerialSignal_CTS)
1248                 strcat(stat_buf, "|CTS");
1249         if (info->signals & SerialSignal_DTR)
1250                 strcat(stat_buf, "|DTR");
1251         if (info->signals & SerialSignal_DSR)
1252                 strcat(stat_buf, "|DSR");
1253         if (info->signals & SerialSignal_DCD)
1254                 strcat(stat_buf, "|CD");
1255         if (info->signals & SerialSignal_RI)
1256                 strcat(stat_buf, "|RI");
1257
1258         if (info->params.mode != MGSL_MODE_ASYNC) {
1259                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1260                                info->icount.txok, info->icount.rxok);
1261                 if (info->icount.txunder)
1262                         seq_printf(m, " txunder:%d", info->icount.txunder);
1263                 if (info->icount.txabort)
1264                         seq_printf(m, " txabort:%d", info->icount.txabort);
1265                 if (info->icount.rxshort)
1266                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1267                 if (info->icount.rxlong)
1268                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1269                 if (info->icount.rxover)
1270                         seq_printf(m, " rxover:%d", info->icount.rxover);
1271                 if (info->icount.rxcrc)
1272                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1273         } else {
1274                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1275                                info->icount.tx, info->icount.rx);
1276                 if (info->icount.frame)
1277                         seq_printf(m, " fe:%d", info->icount.frame);
1278                 if (info->icount.parity)
1279                         seq_printf(m, " pe:%d", info->icount.parity);
1280                 if (info->icount.brk)
1281                         seq_printf(m, " brk:%d", info->icount.brk);
1282                 if (info->icount.overrun)
1283                         seq_printf(m, " oe:%d", info->icount.overrun);
1284         }
1285
1286         /* Append serial signal status to end */
1287         seq_printf(m, " %s\n", stat_buf+1);
1288
1289         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1290                        info->tx_active,info->bh_requested,info->bh_running,
1291                        info->pending_bh);
1292 }
1293
1294 /* Called to print information about devices
1295  */
1296 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1297 {
1298         struct slgt_info *info;
1299
1300         seq_puts(m, "synclink_gt driver\n");
1301
1302         info = slgt_device_list;
1303         while( info ) {
1304                 line_info(m, info);
1305                 info = info->next_device;
1306         }
1307         return 0;
1308 }
1309
1310 /*
1311  * return count of bytes in transmit buffer
1312  */
1313 static int chars_in_buffer(struct tty_struct *tty)
1314 {
1315         struct slgt_info *info = tty->driver_data;
1316         int count;
1317         if (sanity_check(info, tty->name, "chars_in_buffer"))
1318                 return 0;
1319         count = tbuf_bytes(info);
1320         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1321         return count;
1322 }
1323
1324 /*
1325  * signal remote device to throttle send data (our receive data)
1326  */
1327 static void throttle(struct tty_struct * tty)
1328 {
1329         struct slgt_info *info = tty->driver_data;
1330         unsigned long flags;
1331
1332         if (sanity_check(info, tty->name, "throttle"))
1333                 return;
1334         DBGINFO(("%s throttle\n", info->device_name));
1335         if (I_IXOFF(tty))
1336                 send_xchar(tty, STOP_CHAR(tty));
1337         if (C_CRTSCTS(tty)) {
1338                 spin_lock_irqsave(&info->lock,flags);
1339                 info->signals &= ~SerialSignal_RTS;
1340                 set_signals(info);
1341                 spin_unlock_irqrestore(&info->lock,flags);
1342         }
1343 }
1344
1345 /*
1346  * signal remote device to stop throttling send data (our receive data)
1347  */
1348 static void unthrottle(struct tty_struct * tty)
1349 {
1350         struct slgt_info *info = tty->driver_data;
1351         unsigned long flags;
1352
1353         if (sanity_check(info, tty->name, "unthrottle"))
1354                 return;
1355         DBGINFO(("%s unthrottle\n", info->device_name));
1356         if (I_IXOFF(tty)) {
1357                 if (info->x_char)
1358                         info->x_char = 0;
1359                 else
1360                         send_xchar(tty, START_CHAR(tty));
1361         }
1362         if (C_CRTSCTS(tty)) {
1363                 spin_lock_irqsave(&info->lock,flags);
1364                 info->signals |= SerialSignal_RTS;
1365                 set_signals(info);
1366                 spin_unlock_irqrestore(&info->lock,flags);
1367         }
1368 }
1369
1370 /*
1371  * set or clear transmit break condition
1372  * break_state  -1=set break condition, 0=clear
1373  */
1374 static int set_break(struct tty_struct *tty, int break_state)
1375 {
1376         struct slgt_info *info = tty->driver_data;
1377         unsigned short value;
1378         unsigned long flags;
1379
1380         if (sanity_check(info, tty->name, "set_break"))
1381                 return -EINVAL;
1382         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1383
1384         spin_lock_irqsave(&info->lock,flags);
1385         value = rd_reg16(info, TCR);
1386         if (break_state == -1)
1387                 value |= BIT6;
1388         else
1389                 value &= ~BIT6;
1390         wr_reg16(info, TCR, value);
1391         spin_unlock_irqrestore(&info->lock,flags);
1392         return 0;
1393 }
1394
1395 #if SYNCLINK_GENERIC_HDLC
1396
1397 /**
1398  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1399  * set encoding and frame check sequence (FCS) options
1400  *
1401  * dev       pointer to network device structure
1402  * encoding  serial encoding setting
1403  * parity    FCS setting
1404  *
1405  * returns 0 if success, otherwise error code
1406  */
1407 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1408                           unsigned short parity)
1409 {
1410         struct slgt_info *info = dev_to_port(dev);
1411         unsigned char  new_encoding;
1412         unsigned short new_crctype;
1413
1414         /* return error if TTY interface open */
1415         if (info->port.count)
1416                 return -EBUSY;
1417
1418         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1419
1420         switch (encoding)
1421         {
1422         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1423         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1424         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1425         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1426         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1427         default: return -EINVAL;
1428         }
1429
1430         switch (parity)
1431         {
1432         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1433         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1434         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1435         default: return -EINVAL;
1436         }
1437
1438         info->params.encoding = new_encoding;
1439         info->params.crc_type = new_crctype;
1440
1441         /* if network interface up, reprogram hardware */
1442         if (info->netcount)
1443                 program_hw(info);
1444
1445         return 0;
1446 }
1447
1448 /**
1449  * called by generic HDLC layer to send frame
1450  *
1451  * skb  socket buffer containing HDLC frame
1452  * dev  pointer to network device structure
1453  */
1454 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1455                                       struct net_device *dev)
1456 {
1457         struct slgt_info *info = dev_to_port(dev);
1458         unsigned long flags;
1459
1460         DBGINFO(("%s hdlc_xmit\n", dev->name));
1461
1462         if (!skb->len)
1463                 return NETDEV_TX_OK;
1464
1465         /* stop sending until this frame completes */
1466         netif_stop_queue(dev);
1467
1468         /* update network statistics */
1469         dev->stats.tx_packets++;
1470         dev->stats.tx_bytes += skb->len;
1471
1472         /* save start time for transmit timeout detection */
1473         netif_trans_update(dev);
1474
1475         spin_lock_irqsave(&info->lock, flags);
1476         tx_load(info, skb->data, skb->len);
1477         spin_unlock_irqrestore(&info->lock, flags);
1478
1479         /* done with socket buffer, so free it */
1480         dev_kfree_skb(skb);
1481
1482         return NETDEV_TX_OK;
1483 }
1484
1485 /**
1486  * called by network layer when interface enabled
1487  * claim resources and initialize hardware
1488  *
1489  * dev  pointer to network device structure
1490  *
1491  * returns 0 if success, otherwise error code
1492  */
1493 static int hdlcdev_open(struct net_device *dev)
1494 {
1495         struct slgt_info *info = dev_to_port(dev);
1496         int rc;
1497         unsigned long flags;
1498
1499         if (!try_module_get(THIS_MODULE))
1500                 return -EBUSY;
1501
1502         DBGINFO(("%s hdlcdev_open\n", dev->name));
1503
1504         /* generic HDLC layer open processing */
1505         rc = hdlc_open(dev);
1506         if (rc)
1507                 return rc;
1508
1509         /* arbitrate between network and tty opens */
1510         spin_lock_irqsave(&info->netlock, flags);
1511         if (info->port.count != 0 || info->netcount != 0) {
1512                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1513                 spin_unlock_irqrestore(&info->netlock, flags);
1514                 return -EBUSY;
1515         }
1516         info->netcount=1;
1517         spin_unlock_irqrestore(&info->netlock, flags);
1518
1519         /* claim resources and init adapter */
1520         if ((rc = startup(info)) != 0) {
1521                 spin_lock_irqsave(&info->netlock, flags);
1522                 info->netcount=0;
1523                 spin_unlock_irqrestore(&info->netlock, flags);
1524                 return rc;
1525         }
1526
1527         /* assert RTS and DTR, apply hardware settings */
1528         info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1529         program_hw(info);
1530
1531         /* enable network layer transmit */
1532         netif_trans_update(dev);
1533         netif_start_queue(dev);
1534
1535         /* inform generic HDLC layer of current DCD status */
1536         spin_lock_irqsave(&info->lock, flags);
1537         get_signals(info);
1538         spin_unlock_irqrestore(&info->lock, flags);
1539         if (info->signals & SerialSignal_DCD)
1540                 netif_carrier_on(dev);
1541         else
1542                 netif_carrier_off(dev);
1543         return 0;
1544 }
1545
1546 /**
1547  * called by network layer when interface is disabled
1548  * shutdown hardware and release resources
1549  *
1550  * dev  pointer to network device structure
1551  *
1552  * returns 0 if success, otherwise error code
1553  */
1554 static int hdlcdev_close(struct net_device *dev)
1555 {
1556         struct slgt_info *info = dev_to_port(dev);
1557         unsigned long flags;
1558
1559         DBGINFO(("%s hdlcdev_close\n", dev->name));
1560
1561         netif_stop_queue(dev);
1562
1563         /* shutdown adapter and release resources */
1564         shutdown(info);
1565
1566         hdlc_close(dev);
1567
1568         spin_lock_irqsave(&info->netlock, flags);
1569         info->netcount=0;
1570         spin_unlock_irqrestore(&info->netlock, flags);
1571
1572         module_put(THIS_MODULE);
1573         return 0;
1574 }
1575
1576 /**
1577  * called by network layer to process IOCTL call to network device
1578  *
1579  * dev  pointer to network device structure
1580  * ifr  pointer to network interface request structure
1581  * cmd  IOCTL command code
1582  *
1583  * returns 0 if success, otherwise error code
1584  */
1585 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1586 {
1587         const size_t size = sizeof(sync_serial_settings);
1588         sync_serial_settings new_line;
1589         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1590         struct slgt_info *info = dev_to_port(dev);
1591         unsigned int flags;
1592
1593         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1594
1595         /* return error if TTY interface open */
1596         if (info->port.count)
1597                 return -EBUSY;
1598
1599         if (cmd != SIOCWANDEV)
1600                 return hdlc_ioctl(dev, ifr, cmd);
1601
1602         memset(&new_line, 0, sizeof(new_line));
1603
1604         switch(ifr->ifr_settings.type) {
1605         case IF_GET_IFACE: /* return current sync_serial_settings */
1606
1607                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1608                 if (ifr->ifr_settings.size < size) {
1609                         ifr->ifr_settings.size = size; /* data size wanted */
1610                         return -ENOBUFS;
1611                 }
1612
1613                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1614                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1615                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1616                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1617
1618                 switch (flags){
1619                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1620                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1621                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1622                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1623                 default: new_line.clock_type = CLOCK_DEFAULT;
1624                 }
1625
1626                 new_line.clock_rate = info->params.clock_speed;
1627                 new_line.loopback   = info->params.loopback ? 1:0;
1628
1629                 if (copy_to_user(line, &new_line, size))
1630                         return -EFAULT;
1631                 return 0;
1632
1633         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1634
1635                 if(!capable(CAP_NET_ADMIN))
1636                         return -EPERM;
1637                 if (copy_from_user(&new_line, line, size))
1638                         return -EFAULT;
1639
1640                 switch (new_line.clock_type)
1641                 {
1642                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1643                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1644                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1645                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1646                 case CLOCK_DEFAULT:  flags = info->params.flags &
1647                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1648                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1649                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1650                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1651                 default: return -EINVAL;
1652                 }
1653
1654                 if (new_line.loopback != 0 && new_line.loopback != 1)
1655                         return -EINVAL;
1656
1657                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1658                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1659                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1660                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1661                 info->params.flags |= flags;
1662
1663                 info->params.loopback = new_line.loopback;
1664
1665                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1666                         info->params.clock_speed = new_line.clock_rate;
1667                 else
1668                         info->params.clock_speed = 0;
1669
1670                 /* if network interface up, reprogram hardware */
1671                 if (info->netcount)
1672                         program_hw(info);
1673                 return 0;
1674
1675         default:
1676                 return hdlc_ioctl(dev, ifr, cmd);
1677         }
1678 }
1679
1680 /**
1681  * called by network layer when transmit timeout is detected
1682  *
1683  * dev  pointer to network device structure
1684  */
1685 static void hdlcdev_tx_timeout(struct net_device *dev)
1686 {
1687         struct slgt_info *info = dev_to_port(dev);
1688         unsigned long flags;
1689
1690         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1691
1692         dev->stats.tx_errors++;
1693         dev->stats.tx_aborted_errors++;
1694
1695         spin_lock_irqsave(&info->lock,flags);
1696         tx_stop(info);
1697         spin_unlock_irqrestore(&info->lock,flags);
1698
1699         netif_wake_queue(dev);
1700 }
1701
1702 /**
1703  * called by device driver when transmit completes
1704  * reenable network layer transmit if stopped
1705  *
1706  * info  pointer to device instance information
1707  */
1708 static void hdlcdev_tx_done(struct slgt_info *info)
1709 {
1710         if (netif_queue_stopped(info->netdev))
1711                 netif_wake_queue(info->netdev);
1712 }
1713
1714 /**
1715  * called by device driver when frame received
1716  * pass frame to network layer
1717  *
1718  * info  pointer to device instance information
1719  * buf   pointer to buffer contianing frame data
1720  * size  count of data bytes in buf
1721  */
1722 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1723 {
1724         struct sk_buff *skb = dev_alloc_skb(size);
1725         struct net_device *dev = info->netdev;
1726
1727         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1728
1729         if (skb == NULL) {
1730                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1731                 dev->stats.rx_dropped++;
1732                 return;
1733         }
1734
1735         skb_put_data(skb, buf, size);
1736
1737         skb->protocol = hdlc_type_trans(skb, dev);
1738
1739         dev->stats.rx_packets++;
1740         dev->stats.rx_bytes += size;
1741
1742         netif_rx(skb);
1743 }
1744
1745 static const struct net_device_ops hdlcdev_ops = {
1746         .ndo_open       = hdlcdev_open,
1747         .ndo_stop       = hdlcdev_close,
1748         .ndo_start_xmit = hdlc_start_xmit,
1749         .ndo_do_ioctl   = hdlcdev_ioctl,
1750         .ndo_tx_timeout = hdlcdev_tx_timeout,
1751 };
1752
1753 /**
1754  * called by device driver when adding device instance
1755  * do generic HDLC initialization
1756  *
1757  * info  pointer to device instance information
1758  *
1759  * returns 0 if success, otherwise error code
1760  */
1761 static int hdlcdev_init(struct slgt_info *info)
1762 {
1763         int rc;
1764         struct net_device *dev;
1765         hdlc_device *hdlc;
1766
1767         /* allocate and initialize network and HDLC layer objects */
1768
1769         dev = alloc_hdlcdev(info);
1770         if (!dev) {
1771                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1772                 return -ENOMEM;
1773         }
1774
1775         /* for network layer reporting purposes only */
1776         dev->mem_start = info->phys_reg_addr;
1777         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1778         dev->irq       = info->irq_level;
1779
1780         /* network layer callbacks and settings */
1781         dev->netdev_ops     = &hdlcdev_ops;
1782         dev->watchdog_timeo = 10 * HZ;
1783         dev->tx_queue_len   = 50;
1784
1785         /* generic HDLC layer callbacks and settings */
1786         hdlc         = dev_to_hdlc(dev);
1787         hdlc->attach = hdlcdev_attach;
1788         hdlc->xmit   = hdlcdev_xmit;
1789
1790         /* register objects with HDLC layer */
1791         rc = register_hdlc_device(dev);
1792         if (rc) {
1793                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1794                 free_netdev(dev);
1795                 return rc;
1796         }
1797
1798         info->netdev = dev;
1799         return 0;
1800 }
1801
1802 /**
1803  * called by device driver when removing device instance
1804  * do generic HDLC cleanup
1805  *
1806  * info  pointer to device instance information
1807  */
1808 static void hdlcdev_exit(struct slgt_info *info)
1809 {
1810         unregister_hdlc_device(info->netdev);
1811         free_netdev(info->netdev);
1812         info->netdev = NULL;
1813 }
1814
1815 #endif /* ifdef CONFIG_HDLC */
1816
1817 /*
1818  * get async data from rx DMA buffers
1819  */
1820 static void rx_async(struct slgt_info *info)
1821 {
1822         struct mgsl_icount *icount = &info->icount;
1823         unsigned int start, end;
1824         unsigned char *p;
1825         unsigned char status;
1826         struct slgt_desc *bufs = info->rbufs;
1827         int i, count;
1828         int chars = 0;
1829         int stat;
1830         unsigned char ch;
1831
1832         start = end = info->rbuf_current;
1833
1834         while(desc_complete(bufs[end])) {
1835                 count = desc_count(bufs[end]) - info->rbuf_index;
1836                 p     = bufs[end].buf + info->rbuf_index;
1837
1838                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1839                 DBGDATA(info, p, count, "rx");
1840
1841                 for(i=0 ; i < count; i+=2, p+=2) {
1842                         ch = *p;
1843                         icount->rx++;
1844
1845                         stat = 0;
1846
1847                         status = *(p + 1) & (BIT1 + BIT0);
1848                         if (status) {
1849                                 if (status & BIT1)
1850                                         icount->parity++;
1851                                 else if (status & BIT0)
1852                                         icount->frame++;
1853                                 /* discard char if tty control flags say so */
1854                                 if (status & info->ignore_status_mask)
1855                                         continue;
1856                                 if (status & BIT1)
1857                                         stat = TTY_PARITY;
1858                                 else if (status & BIT0)
1859                                         stat = TTY_FRAME;
1860                         }
1861                         tty_insert_flip_char(&info->port, ch, stat);
1862                         chars++;
1863                 }
1864
1865                 if (i < count) {
1866                         /* receive buffer not completed */
1867                         info->rbuf_index += i;
1868                         mod_timer(&info->rx_timer, jiffies + 1);
1869                         break;
1870                 }
1871
1872                 info->rbuf_index = 0;
1873                 free_rbufs(info, end, end);
1874
1875                 if (++end == info->rbuf_count)
1876                         end = 0;
1877
1878                 /* if entire list searched then no frame available */
1879                 if (end == start)
1880                         break;
1881         }
1882
1883         if (chars)
1884                 tty_flip_buffer_push(&info->port);
1885 }
1886
1887 /*
1888  * return next bottom half action to perform
1889  */
1890 static int bh_action(struct slgt_info *info)
1891 {
1892         unsigned long flags;
1893         int rc;
1894
1895         spin_lock_irqsave(&info->lock,flags);
1896
1897         if (info->pending_bh & BH_RECEIVE) {
1898                 info->pending_bh &= ~BH_RECEIVE;
1899                 rc = BH_RECEIVE;
1900         } else if (info->pending_bh & BH_TRANSMIT) {
1901                 info->pending_bh &= ~BH_TRANSMIT;
1902                 rc = BH_TRANSMIT;
1903         } else if (info->pending_bh & BH_STATUS) {
1904                 info->pending_bh &= ~BH_STATUS;
1905                 rc = BH_STATUS;
1906         } else {
1907                 /* Mark BH routine as complete */
1908                 info->bh_running = false;
1909                 info->bh_requested = false;
1910                 rc = 0;
1911         }
1912
1913         spin_unlock_irqrestore(&info->lock,flags);
1914
1915         return rc;
1916 }
1917
1918 /*
1919  * perform bottom half processing
1920  */
1921 static void bh_handler(struct work_struct *work)
1922 {
1923         struct slgt_info *info = container_of(work, struct slgt_info, task);
1924         int action;
1925
1926         info->bh_running = true;
1927
1928         while((action = bh_action(info))) {
1929                 switch (action) {
1930                 case BH_RECEIVE:
1931                         DBGBH(("%s bh receive\n", info->device_name));
1932                         switch(info->params.mode) {
1933                         case MGSL_MODE_ASYNC:
1934                                 rx_async(info);
1935                                 break;
1936                         case MGSL_MODE_HDLC:
1937                                 while(rx_get_frame(info));
1938                                 break;
1939                         case MGSL_MODE_RAW:
1940                         case MGSL_MODE_MONOSYNC:
1941                         case MGSL_MODE_BISYNC:
1942                         case MGSL_MODE_XSYNC:
1943                                 while(rx_get_buf(info));
1944                                 break;
1945                         }
1946                         /* restart receiver if rx DMA buffers exhausted */
1947                         if (info->rx_restart)
1948                                 rx_start(info);
1949                         break;
1950                 case BH_TRANSMIT:
1951                         bh_transmit(info);
1952                         break;
1953                 case BH_STATUS:
1954                         DBGBH(("%s bh status\n", info->device_name));
1955                         info->ri_chkcount = 0;
1956                         info->dsr_chkcount = 0;
1957                         info->dcd_chkcount = 0;
1958                         info->cts_chkcount = 0;
1959                         break;
1960                 default:
1961                         DBGBH(("%s unknown action\n", info->device_name));
1962                         break;
1963                 }
1964         }
1965         DBGBH(("%s bh_handler exit\n", info->device_name));
1966 }
1967
1968 static void bh_transmit(struct slgt_info *info)
1969 {
1970         struct tty_struct *tty = info->port.tty;
1971
1972         DBGBH(("%s bh_transmit\n", info->device_name));
1973         if (tty)
1974                 tty_wakeup(tty);
1975 }
1976
1977 static void dsr_change(struct slgt_info *info, unsigned short status)
1978 {
1979         if (status & BIT3) {
1980                 info->signals |= SerialSignal_DSR;
1981                 info->input_signal_events.dsr_up++;
1982         } else {
1983                 info->signals &= ~SerialSignal_DSR;
1984                 info->input_signal_events.dsr_down++;
1985         }
1986         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1987         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1988                 slgt_irq_off(info, IRQ_DSR);
1989                 return;
1990         }
1991         info->icount.dsr++;
1992         wake_up_interruptible(&info->status_event_wait_q);
1993         wake_up_interruptible(&info->event_wait_q);
1994         info->pending_bh |= BH_STATUS;
1995 }
1996
1997 static void cts_change(struct slgt_info *info, unsigned short status)
1998 {
1999         if (status & BIT2) {
2000                 info->signals |= SerialSignal_CTS;
2001                 info->input_signal_events.cts_up++;
2002         } else {
2003                 info->signals &= ~SerialSignal_CTS;
2004                 info->input_signal_events.cts_down++;
2005         }
2006         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2007         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2008                 slgt_irq_off(info, IRQ_CTS);
2009                 return;
2010         }
2011         info->icount.cts++;
2012         wake_up_interruptible(&info->status_event_wait_q);
2013         wake_up_interruptible(&info->event_wait_q);
2014         info->pending_bh |= BH_STATUS;
2015
2016         if (tty_port_cts_enabled(&info->port)) {
2017                 if (info->port.tty) {
2018                         if (info->port.tty->hw_stopped) {
2019                                 if (info->signals & SerialSignal_CTS) {
2020                                         info->port.tty->hw_stopped = 0;
2021                                         info->pending_bh |= BH_TRANSMIT;
2022                                         return;
2023                                 }
2024                         } else {
2025                                 if (!(info->signals & SerialSignal_CTS))
2026                                         info->port.tty->hw_stopped = 1;
2027                         }
2028                 }
2029         }
2030 }
2031
2032 static void dcd_change(struct slgt_info *info, unsigned short status)
2033 {
2034         if (status & BIT1) {
2035                 info->signals |= SerialSignal_DCD;
2036                 info->input_signal_events.dcd_up++;
2037         } else {
2038                 info->signals &= ~SerialSignal_DCD;
2039                 info->input_signal_events.dcd_down++;
2040         }
2041         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2042         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2043                 slgt_irq_off(info, IRQ_DCD);
2044                 return;
2045         }
2046         info->icount.dcd++;
2047 #if SYNCLINK_GENERIC_HDLC
2048         if (info->netcount) {
2049                 if (info->signals & SerialSignal_DCD)
2050                         netif_carrier_on(info->netdev);
2051                 else
2052                         netif_carrier_off(info->netdev);
2053         }
2054 #endif
2055         wake_up_interruptible(&info->status_event_wait_q);
2056         wake_up_interruptible(&info->event_wait_q);
2057         info->pending_bh |= BH_STATUS;
2058
2059         if (tty_port_check_carrier(&info->port)) {
2060                 if (info->signals & SerialSignal_DCD)
2061                         wake_up_interruptible(&info->port.open_wait);
2062                 else {
2063                         if (info->port.tty)
2064                                 tty_hangup(info->port.tty);
2065                 }
2066         }
2067 }
2068
2069 static void ri_change(struct slgt_info *info, unsigned short status)
2070 {
2071         if (status & BIT0) {
2072                 info->signals |= SerialSignal_RI;
2073                 info->input_signal_events.ri_up++;
2074         } else {
2075                 info->signals &= ~SerialSignal_RI;
2076                 info->input_signal_events.ri_down++;
2077         }
2078         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2079         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2080                 slgt_irq_off(info, IRQ_RI);
2081                 return;
2082         }
2083         info->icount.rng++;
2084         wake_up_interruptible(&info->status_event_wait_q);
2085         wake_up_interruptible(&info->event_wait_q);
2086         info->pending_bh |= BH_STATUS;
2087 }
2088
2089 static void isr_rxdata(struct slgt_info *info)
2090 {
2091         unsigned int count = info->rbuf_fill_count;
2092         unsigned int i = info->rbuf_fill_index;
2093         unsigned short reg;
2094
2095         while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2096                 reg = rd_reg16(info, RDR);
2097                 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2098                 if (desc_complete(info->rbufs[i])) {
2099                         /* all buffers full */
2100                         rx_stop(info);
2101                         info->rx_restart = 1;
2102                         continue;
2103                 }
2104                 info->rbufs[i].buf[count++] = (unsigned char)reg;
2105                 /* async mode saves status byte to buffer for each data byte */
2106                 if (info->params.mode == MGSL_MODE_ASYNC)
2107                         info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2108                 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2109                         /* buffer full or end of frame */
2110                         set_desc_count(info->rbufs[i], count);
2111                         set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2112                         info->rbuf_fill_count = count = 0;
2113                         if (++i == info->rbuf_count)
2114                                 i = 0;
2115                         info->pending_bh |= BH_RECEIVE;
2116                 }
2117         }
2118
2119         info->rbuf_fill_index = i;
2120         info->rbuf_fill_count = count;
2121 }
2122
2123 static void isr_serial(struct slgt_info *info)
2124 {
2125         unsigned short status = rd_reg16(info, SSR);
2126
2127         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2128
2129         wr_reg16(info, SSR, status); /* clear pending */
2130
2131         info->irq_occurred = true;
2132
2133         if (info->params.mode == MGSL_MODE_ASYNC) {
2134                 if (status & IRQ_TXIDLE) {
2135                         if (info->tx_active)
2136                                 isr_txeom(info, status);
2137                 }
2138                 if (info->rx_pio && (status & IRQ_RXDATA))
2139                         isr_rxdata(info);
2140                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2141                         info->icount.brk++;
2142                         /* process break detection if tty control allows */
2143                         if (info->port.tty) {
2144                                 if (!(status & info->ignore_status_mask)) {
2145                                         if (info->read_status_mask & MASK_BREAK) {
2146                                                 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2147                                                 if (info->port.flags & ASYNC_SAK)
2148                                                         do_SAK(info->port.tty);
2149                                         }
2150                                 }
2151                         }
2152                 }
2153         } else {
2154                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2155                         isr_txeom(info, status);
2156                 if (info->rx_pio && (status & IRQ_RXDATA))
2157                         isr_rxdata(info);
2158                 if (status & IRQ_RXIDLE) {
2159                         if (status & RXIDLE)
2160                                 info->icount.rxidle++;
2161                         else
2162                                 info->icount.exithunt++;
2163                         wake_up_interruptible(&info->event_wait_q);
2164                 }
2165
2166                 if (status & IRQ_RXOVER)
2167                         rx_start(info);
2168         }
2169
2170         if (status & IRQ_DSR)
2171                 dsr_change(info, status);
2172         if (status & IRQ_CTS)
2173                 cts_change(info, status);
2174         if (status & IRQ_DCD)
2175                 dcd_change(info, status);
2176         if (status & IRQ_RI)
2177                 ri_change(info, status);
2178 }
2179
2180 static void isr_rdma(struct slgt_info *info)
2181 {
2182         unsigned int status = rd_reg32(info, RDCSR);
2183
2184         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2185
2186         /* RDCSR (rx DMA control/status)
2187          *
2188          * 31..07  reserved
2189          * 06      save status byte to DMA buffer
2190          * 05      error
2191          * 04      eol (end of list)
2192          * 03      eob (end of buffer)
2193          * 02      IRQ enable
2194          * 01      reset
2195          * 00      enable
2196          */
2197         wr_reg32(info, RDCSR, status);  /* clear pending */
2198
2199         if (status & (BIT5 + BIT4)) {
2200                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2201                 info->rx_restart = true;
2202         }
2203         info->pending_bh |= BH_RECEIVE;
2204 }
2205
2206 static void isr_tdma(struct slgt_info *info)
2207 {
2208         unsigned int status = rd_reg32(info, TDCSR);
2209
2210         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2211
2212         /* TDCSR (tx DMA control/status)
2213          *
2214          * 31..06  reserved
2215          * 05      error
2216          * 04      eol (end of list)
2217          * 03      eob (end of buffer)
2218          * 02      IRQ enable
2219          * 01      reset
2220          * 00      enable
2221          */
2222         wr_reg32(info, TDCSR, status);  /* clear pending */
2223
2224         if (status & (BIT5 + BIT4 + BIT3)) {
2225                 // another transmit buffer has completed
2226                 // run bottom half to get more send data from user
2227                 info->pending_bh |= BH_TRANSMIT;
2228         }
2229 }
2230
2231 /*
2232  * return true if there are unsent tx DMA buffers, otherwise false
2233  *
2234  * if there are unsent buffers then info->tbuf_start
2235  * is set to index of first unsent buffer
2236  */
2237 static bool unsent_tbufs(struct slgt_info *info)
2238 {
2239         unsigned int i = info->tbuf_current;
2240         bool rc = false;
2241
2242         /*
2243          * search backwards from last loaded buffer (precedes tbuf_current)
2244          * for first unsent buffer (desc_count > 0)
2245          */
2246
2247         do {
2248                 if (i)
2249                         i--;
2250                 else
2251                         i = info->tbuf_count - 1;
2252                 if (!desc_count(info->tbufs[i]))
2253                         break;
2254                 info->tbuf_start = i;
2255                 rc = true;
2256         } while (i != info->tbuf_current);
2257
2258         return rc;
2259 }
2260
2261 static void isr_txeom(struct slgt_info *info, unsigned short status)
2262 {
2263         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2264
2265         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2266         tdma_reset(info);
2267         if (status & IRQ_TXUNDER) {
2268                 unsigned short val = rd_reg16(info, TCR);
2269                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2270                 wr_reg16(info, TCR, val); /* clear reset bit */
2271         }
2272
2273         if (info->tx_active) {
2274                 if (info->params.mode != MGSL_MODE_ASYNC) {
2275                         if (status & IRQ_TXUNDER)
2276                                 info->icount.txunder++;
2277                         else if (status & IRQ_TXIDLE)
2278                                 info->icount.txok++;
2279                 }
2280
2281                 if (unsent_tbufs(info)) {
2282                         tx_start(info);
2283                         update_tx_timer(info);
2284                         return;
2285                 }
2286                 info->tx_active = false;
2287
2288                 del_timer(&info->tx_timer);
2289
2290                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2291                         info->signals &= ~SerialSignal_RTS;
2292                         info->drop_rts_on_tx_done = false;
2293                         set_signals(info);
2294                 }
2295
2296 #if SYNCLINK_GENERIC_HDLC
2297                 if (info->netcount)
2298                         hdlcdev_tx_done(info);
2299                 else
2300 #endif
2301                 {
2302                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2303                                 tx_stop(info);
2304                                 return;
2305                         }
2306                         info->pending_bh |= BH_TRANSMIT;
2307                 }
2308         }
2309 }
2310
2311 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2312 {
2313         struct cond_wait *w, *prev;
2314
2315         /* wake processes waiting for specific transitions */
2316         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2317                 if (w->data & changed) {
2318                         w->data = state;
2319                         wake_up_interruptible(&w->q);
2320                         if (prev != NULL)
2321                                 prev->next = w->next;
2322                         else
2323                                 info->gpio_wait_q = w->next;
2324                 } else
2325                         prev = w;
2326         }
2327 }
2328
2329 /* interrupt service routine
2330  *
2331  *      irq     interrupt number
2332  *      dev_id  device ID supplied during interrupt registration
2333  */
2334 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2335 {
2336         struct slgt_info *info = dev_id;
2337         unsigned int gsr;
2338         unsigned int i;
2339
2340         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2341
2342         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2343                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2344                 info->irq_occurred = true;
2345                 for(i=0; i < info->port_count ; i++) {
2346                         if (info->port_array[i] == NULL)
2347                                 continue;
2348                         spin_lock(&info->port_array[i]->lock);
2349                         if (gsr & (BIT8 << i))
2350                                 isr_serial(info->port_array[i]);
2351                         if (gsr & (BIT16 << (i*2)))
2352                                 isr_rdma(info->port_array[i]);
2353                         if (gsr & (BIT17 << (i*2)))
2354                                 isr_tdma(info->port_array[i]);
2355                         spin_unlock(&info->port_array[i]->lock);
2356                 }
2357         }
2358
2359         if (info->gpio_present) {
2360                 unsigned int state;
2361                 unsigned int changed;
2362                 spin_lock(&info->lock);
2363                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2364                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2365                         /* read latched state of GPIO signals */
2366                         state = rd_reg32(info, IOVR);
2367                         /* clear pending GPIO interrupt bits */
2368                         wr_reg32(info, IOSR, changed);
2369                         for (i=0 ; i < info->port_count ; i++) {
2370                                 if (info->port_array[i] != NULL)
2371                                         isr_gpio(info->port_array[i], changed, state);
2372                         }
2373                 }
2374                 spin_unlock(&info->lock);
2375         }
2376
2377         for(i=0; i < info->port_count ; i++) {
2378                 struct slgt_info *port = info->port_array[i];
2379                 if (port == NULL)
2380                         continue;
2381                 spin_lock(&port->lock);
2382                 if ((port->port.count || port->netcount) &&
2383                     port->pending_bh && !port->bh_running &&
2384                     !port->bh_requested) {
2385                         DBGISR(("%s bh queued\n", port->device_name));
2386                         schedule_work(&port->task);
2387                         port->bh_requested = true;
2388                 }
2389                 spin_unlock(&port->lock);
2390         }
2391
2392         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2393         return IRQ_HANDLED;
2394 }
2395
2396 static int startup(struct slgt_info *info)
2397 {
2398         DBGINFO(("%s startup\n", info->device_name));
2399
2400         if (tty_port_initialized(&info->port))
2401                 return 0;
2402
2403         if (!info->tx_buf) {
2404                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2405                 if (!info->tx_buf) {
2406                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2407                         return -ENOMEM;
2408                 }
2409         }
2410
2411         info->pending_bh = 0;
2412
2413         memset(&info->icount, 0, sizeof(info->icount));
2414
2415         /* program hardware for current parameters */
2416         change_params(info);
2417
2418         if (info->port.tty)
2419                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2420
2421         tty_port_set_initialized(&info->port, 1);
2422
2423         return 0;
2424 }
2425
2426 /*
2427  *  called by close() and hangup() to shutdown hardware
2428  */
2429 static void shutdown(struct slgt_info *info)
2430 {
2431         unsigned long flags;
2432
2433         if (!tty_port_initialized(&info->port))
2434                 return;
2435
2436         DBGINFO(("%s shutdown\n", info->device_name));
2437
2438         /* clear status wait queue because status changes */
2439         /* can't happen after shutting down the hardware */
2440         wake_up_interruptible(&info->status_event_wait_q);
2441         wake_up_interruptible(&info->event_wait_q);
2442
2443         del_timer_sync(&info->tx_timer);
2444         del_timer_sync(&info->rx_timer);
2445
2446         kfree(info->tx_buf);
2447         info->tx_buf = NULL;
2448
2449         spin_lock_irqsave(&info->lock,flags);
2450
2451         tx_stop(info);
2452         rx_stop(info);
2453
2454         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2455
2456         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2457                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2458                 set_signals(info);
2459         }
2460
2461         flush_cond_wait(&info->gpio_wait_q);
2462
2463         spin_unlock_irqrestore(&info->lock,flags);
2464
2465         if (info->port.tty)
2466                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2467
2468         tty_port_set_initialized(&info->port, 0);
2469 }
2470
2471 static void program_hw(struct slgt_info *info)
2472 {
2473         unsigned long flags;
2474
2475         spin_lock_irqsave(&info->lock,flags);
2476
2477         rx_stop(info);
2478         tx_stop(info);
2479
2480         if (info->params.mode != MGSL_MODE_ASYNC ||
2481             info->netcount)
2482                 sync_mode(info);
2483         else
2484                 async_mode(info);
2485
2486         set_signals(info);
2487
2488         info->dcd_chkcount = 0;
2489         info->cts_chkcount = 0;
2490         info->ri_chkcount = 0;
2491         info->dsr_chkcount = 0;
2492
2493         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2494         get_signals(info);
2495
2496         if (info->netcount ||
2497             (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2498                 rx_start(info);
2499
2500         spin_unlock_irqrestore(&info->lock,flags);
2501 }
2502
2503 /*
2504  * reconfigure adapter based on new parameters
2505  */
2506 static void change_params(struct slgt_info *info)
2507 {
2508         unsigned cflag;
2509         int bits_per_char;
2510
2511         if (!info->port.tty)
2512                 return;
2513         DBGINFO(("%s change_params\n", info->device_name));
2514
2515         cflag = info->port.tty->termios.c_cflag;
2516
2517         /* if B0 rate (hangup) specified then negate RTS and DTR */
2518         /* otherwise assert RTS and DTR */
2519         if (cflag & CBAUD)
2520                 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2521         else
2522                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2523
2524         /* byte size and parity */
2525
2526         switch (cflag & CSIZE) {
2527         case CS5: info->params.data_bits = 5; break;
2528         case CS6: info->params.data_bits = 6; break;
2529         case CS7: info->params.data_bits = 7; break;
2530         case CS8: info->params.data_bits = 8; break;
2531         default:  info->params.data_bits = 7; break;
2532         }
2533
2534         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2535
2536         if (cflag & PARENB)
2537                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2538         else
2539                 info->params.parity = ASYNC_PARITY_NONE;
2540
2541         /* calculate number of jiffies to transmit a full
2542          * FIFO (32 bytes) at specified data rate
2543          */
2544         bits_per_char = info->params.data_bits +
2545                         info->params.stop_bits + 1;
2546
2547         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2548
2549         if (info->params.data_rate) {
2550                 info->timeout = (32*HZ*bits_per_char) /
2551                                 info->params.data_rate;
2552         }
2553         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2554
2555         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2556         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2557
2558         /* process tty input control flags */
2559
2560         info->read_status_mask = IRQ_RXOVER;
2561         if (I_INPCK(info->port.tty))
2562                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2563         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2564                 info->read_status_mask |= MASK_BREAK;
2565         if (I_IGNPAR(info->port.tty))
2566                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2567         if (I_IGNBRK(info->port.tty)) {
2568                 info->ignore_status_mask |= MASK_BREAK;
2569                 /* If ignoring parity and break indicators, ignore
2570                  * overruns too.  (For real raw support).
2571                  */
2572                 if (I_IGNPAR(info->port.tty))
2573                         info->ignore_status_mask |= MASK_OVERRUN;
2574         }
2575
2576         program_hw(info);
2577 }
2578
2579 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2580 {
2581         DBGINFO(("%s get_stats\n",  info->device_name));
2582         if (!user_icount) {
2583                 memset(&info->icount, 0, sizeof(info->icount));
2584         } else {
2585                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2586                         return -EFAULT;
2587         }
2588         return 0;
2589 }
2590
2591 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2592 {
2593         DBGINFO(("%s get_params\n", info->device_name));
2594         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2595                 return -EFAULT;
2596         return 0;
2597 }
2598
2599 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2600 {
2601         unsigned long flags;
2602         MGSL_PARAMS tmp_params;
2603
2604         DBGINFO(("%s set_params\n", info->device_name));
2605         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2606                 return -EFAULT;
2607
2608         spin_lock_irqsave(&info->lock, flags);
2609         if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2610                 info->base_clock = tmp_params.clock_speed;
2611         else
2612                 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2613         spin_unlock_irqrestore(&info->lock, flags);
2614
2615         program_hw(info);
2616
2617         return 0;
2618 }
2619
2620 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2621 {
2622         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2623         if (put_user(info->idle_mode, idle_mode))
2624                 return -EFAULT;
2625         return 0;
2626 }
2627
2628 static int set_txidle(struct slgt_info *info, int idle_mode)
2629 {
2630         unsigned long flags;
2631         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2632         spin_lock_irqsave(&info->lock,flags);
2633         info->idle_mode = idle_mode;
2634         if (info->params.mode != MGSL_MODE_ASYNC)
2635                 tx_set_idle(info);
2636         spin_unlock_irqrestore(&info->lock,flags);
2637         return 0;
2638 }
2639
2640 static int tx_enable(struct slgt_info *info, int enable)
2641 {
2642         unsigned long flags;
2643         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2644         spin_lock_irqsave(&info->lock,flags);
2645         if (enable) {
2646                 if (!info->tx_enabled)
2647                         tx_start(info);
2648         } else {
2649                 if (info->tx_enabled)
2650                         tx_stop(info);
2651         }
2652         spin_unlock_irqrestore(&info->lock,flags);
2653         return 0;
2654 }
2655
2656 /*
2657  * abort transmit HDLC frame
2658  */
2659 static int tx_abort(struct slgt_info *info)
2660 {
2661         unsigned long flags;
2662         DBGINFO(("%s tx_abort\n", info->device_name));
2663         spin_lock_irqsave(&info->lock,flags);
2664         tdma_reset(info);
2665         spin_unlock_irqrestore(&info->lock,flags);
2666         return 0;
2667 }
2668
2669 static int rx_enable(struct slgt_info *info, int enable)
2670 {
2671         unsigned long flags;
2672         unsigned int rbuf_fill_level;
2673         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2674         spin_lock_irqsave(&info->lock,flags);
2675         /*
2676          * enable[31..16] = receive DMA buffer fill level
2677          * 0 = noop (leave fill level unchanged)
2678          * fill level must be multiple of 4 and <= buffer size
2679          */
2680         rbuf_fill_level = ((unsigned int)enable) >> 16;
2681         if (rbuf_fill_level) {
2682                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2683                         spin_unlock_irqrestore(&info->lock, flags);
2684                         return -EINVAL;
2685                 }
2686                 info->rbuf_fill_level = rbuf_fill_level;
2687                 if (rbuf_fill_level < 128)
2688                         info->rx_pio = 1; /* PIO mode */
2689                 else
2690                         info->rx_pio = 0; /* DMA mode */
2691                 rx_stop(info); /* restart receiver to use new fill level */
2692         }
2693
2694         /*
2695          * enable[1..0] = receiver enable command
2696          * 0 = disable
2697          * 1 = enable
2698          * 2 = enable or force hunt mode if already enabled
2699          */
2700         enable &= 3;
2701         if (enable) {
2702                 if (!info->rx_enabled)
2703                         rx_start(info);
2704                 else if (enable == 2) {
2705                         /* force hunt mode (write 1 to RCR[3]) */
2706                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2707                 }
2708         } else {
2709                 if (info->rx_enabled)
2710                         rx_stop(info);
2711         }
2712         spin_unlock_irqrestore(&info->lock,flags);
2713         return 0;
2714 }
2715
2716 /*
2717  *  wait for specified event to occur
2718  */
2719 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2720 {
2721         unsigned long flags;
2722         int s;
2723         int rc=0;
2724         struct mgsl_icount cprev, cnow;
2725         int events;
2726         int mask;
2727         struct  _input_signal_events oldsigs, newsigs;
2728         DECLARE_WAITQUEUE(wait, current);
2729
2730         if (get_user(mask, mask_ptr))
2731                 return -EFAULT;
2732
2733         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2734
2735         spin_lock_irqsave(&info->lock,flags);
2736
2737         /* return immediately if state matches requested events */
2738         get_signals(info);
2739         s = info->signals;
2740
2741         events = mask &
2742                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2743                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2744                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2745                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2746         if (events) {
2747                 spin_unlock_irqrestore(&info->lock,flags);
2748                 goto exit;
2749         }
2750
2751         /* save current irq counts */
2752         cprev = info->icount;
2753         oldsigs = info->input_signal_events;
2754
2755         /* enable hunt and idle irqs if needed */
2756         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2757                 unsigned short val = rd_reg16(info, SCR);
2758                 if (!(val & IRQ_RXIDLE))
2759                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2760         }
2761
2762         set_current_state(TASK_INTERRUPTIBLE);
2763         add_wait_queue(&info->event_wait_q, &wait);
2764
2765         spin_unlock_irqrestore(&info->lock,flags);
2766
2767         for(;;) {
2768                 schedule();
2769                 if (signal_pending(current)) {
2770                         rc = -ERESTARTSYS;
2771                         break;
2772                 }
2773
2774                 /* get current irq counts */
2775                 spin_lock_irqsave(&info->lock,flags);
2776                 cnow = info->icount;
2777                 newsigs = info->input_signal_events;
2778                 set_current_state(TASK_INTERRUPTIBLE);
2779                 spin_unlock_irqrestore(&info->lock,flags);
2780
2781                 /* if no change, wait aborted for some reason */
2782                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2783                     newsigs.dsr_down == oldsigs.dsr_down &&
2784                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2785                     newsigs.dcd_down == oldsigs.dcd_down &&
2786                     newsigs.cts_up   == oldsigs.cts_up   &&
2787                     newsigs.cts_down == oldsigs.cts_down &&
2788                     newsigs.ri_up    == oldsigs.ri_up    &&
2789                     newsigs.ri_down  == oldsigs.ri_down  &&
2790                     cnow.exithunt    == cprev.exithunt   &&
2791                     cnow.rxidle      == cprev.rxidle) {
2792                         rc = -EIO;
2793                         break;
2794                 }
2795
2796                 events = mask &
2797                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2798                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2799                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2800                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2801                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2802                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2803                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2804                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2805                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2806                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2807                 if (events)
2808                         break;
2809
2810                 cprev = cnow;
2811                 oldsigs = newsigs;
2812         }
2813
2814         remove_wait_queue(&info->event_wait_q, &wait);
2815         set_current_state(TASK_RUNNING);
2816
2817
2818         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2819                 spin_lock_irqsave(&info->lock,flags);
2820                 if (!waitqueue_active(&info->event_wait_q)) {
2821                         /* disable enable exit hunt mode/idle rcvd IRQs */
2822                         wr_reg16(info, SCR,
2823                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2824                 }
2825                 spin_unlock_irqrestore(&info->lock,flags);
2826         }
2827 exit:
2828         if (rc == 0)
2829                 rc = put_user(events, mask_ptr);
2830         return rc;
2831 }
2832
2833 static int get_interface(struct slgt_info *info, int __user *if_mode)
2834 {
2835         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2836         if (put_user(info->if_mode, if_mode))
2837                 return -EFAULT;
2838         return 0;
2839 }
2840
2841 static int set_interface(struct slgt_info *info, int if_mode)
2842 {
2843         unsigned long flags;
2844         unsigned short val;
2845
2846         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2847         spin_lock_irqsave(&info->lock,flags);
2848         info->if_mode = if_mode;
2849
2850         msc_set_vcr(info);
2851
2852         /* TCR (tx control) 07  1=RTS driver control */
2853         val = rd_reg16(info, TCR);
2854         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2855                 val |= BIT7;
2856         else
2857                 val &= ~BIT7;
2858         wr_reg16(info, TCR, val);
2859
2860         spin_unlock_irqrestore(&info->lock,flags);
2861         return 0;
2862 }
2863
2864 static int get_xsync(struct slgt_info *info, int __user *xsync)
2865 {
2866         DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2867         if (put_user(info->xsync, xsync))
2868                 return -EFAULT;
2869         return 0;
2870 }
2871
2872 /*
2873  * set extended sync pattern (1 to 4 bytes) for extended sync mode
2874  *
2875  * sync pattern is contained in least significant bytes of value
2876  * most significant byte of sync pattern is oldest (1st sent/detected)
2877  */
2878 static int set_xsync(struct slgt_info *info, int xsync)
2879 {
2880         unsigned long flags;
2881
2882         DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2883         spin_lock_irqsave(&info->lock, flags);
2884         info->xsync = xsync;
2885         wr_reg32(info, XSR, xsync);
2886         spin_unlock_irqrestore(&info->lock, flags);
2887         return 0;
2888 }
2889
2890 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2891 {
2892         DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2893         if (put_user(info->xctrl, xctrl))
2894                 return -EFAULT;
2895         return 0;
2896 }
2897
2898 /*
2899  * set extended control options
2900  *
2901  * xctrl[31:19] reserved, must be zero
2902  * xctrl[18:17] extended sync pattern length in bytes
2903  *              00 = 1 byte  in xsr[7:0]
2904  *              01 = 2 bytes in xsr[15:0]
2905  *              10 = 3 bytes in xsr[23:0]
2906  *              11 = 4 bytes in xsr[31:0]
2907  * xctrl[16]    1 = enable terminal count, 0=disabled
2908  * xctrl[15:0]  receive terminal count for fixed length packets
2909  *              value is count minus one (0 = 1 byte packet)
2910  *              when terminal count is reached, receiver
2911  *              automatically returns to hunt mode and receive
2912  *              FIFO contents are flushed to DMA buffers with
2913  *              end of frame (EOF) status
2914  */
2915 static int set_xctrl(struct slgt_info *info, int xctrl)
2916 {
2917         unsigned long flags;
2918
2919         DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2920         spin_lock_irqsave(&info->lock, flags);
2921         info->xctrl = xctrl;
2922         wr_reg32(info, XCR, xctrl);
2923         spin_unlock_irqrestore(&info->lock, flags);
2924         return 0;
2925 }
2926
2927 /*
2928  * set general purpose IO pin state and direction
2929  *
2930  * user_gpio fields:
2931  * state   each bit indicates a pin state
2932  * smask   set bit indicates pin state to set
2933  * dir     each bit indicates a pin direction (0=input, 1=output)
2934  * dmask   set bit indicates pin direction to set
2935  */
2936 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2937 {
2938         unsigned long flags;
2939         struct gpio_desc gpio;
2940         __u32 data;
2941
2942         if (!info->gpio_present)
2943                 return -EINVAL;
2944         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2945                 return -EFAULT;
2946         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2947                  info->device_name, gpio.state, gpio.smask,
2948                  gpio.dir, gpio.dmask));
2949
2950         spin_lock_irqsave(&info->port_array[0]->lock, flags);
2951         if (gpio.dmask) {
2952                 data = rd_reg32(info, IODR);
2953                 data |= gpio.dmask & gpio.dir;
2954                 data &= ~(gpio.dmask & ~gpio.dir);
2955                 wr_reg32(info, IODR, data);
2956         }
2957         if (gpio.smask) {
2958                 data = rd_reg32(info, IOVR);
2959                 data |= gpio.smask & gpio.state;
2960                 data &= ~(gpio.smask & ~gpio.state);
2961                 wr_reg32(info, IOVR, data);
2962         }
2963         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2964
2965         return 0;
2966 }
2967
2968 /*
2969  * get general purpose IO pin state and direction
2970  */
2971 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2972 {
2973         struct gpio_desc gpio;
2974         if (!info->gpio_present)
2975                 return -EINVAL;
2976         gpio.state = rd_reg32(info, IOVR);
2977         gpio.smask = 0xffffffff;
2978         gpio.dir   = rd_reg32(info, IODR);
2979         gpio.dmask = 0xffffffff;
2980         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2981                 return -EFAULT;
2982         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2983                  info->device_name, gpio.state, gpio.dir));
2984         return 0;
2985 }
2986
2987 /*
2988  * conditional wait facility
2989  */
2990 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2991 {
2992         init_waitqueue_head(&w->q);
2993         init_waitqueue_entry(&w->wait, current);
2994         w->data = data;
2995 }
2996
2997 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2998 {
2999         set_current_state(TASK_INTERRUPTIBLE);
3000         add_wait_queue(&w->q, &w->wait);
3001         w->next = *head;
3002         *head = w;
3003 }
3004
3005 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3006 {
3007         struct cond_wait *w, *prev;
3008         remove_wait_queue(&cw->q, &cw->wait);
3009         set_current_state(TASK_RUNNING);
3010         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3011                 if (w == cw) {
3012                         if (prev != NULL)
3013                                 prev->next = w->next;
3014                         else
3015                                 *head = w->next;
3016                         break;
3017                 }
3018         }
3019 }
3020
3021 static void flush_cond_wait(struct cond_wait **head)
3022 {
3023         while (*head != NULL) {
3024                 wake_up_interruptible(&(*head)->q);
3025                 *head = (*head)->next;
3026         }
3027 }
3028
3029 /*
3030  * wait for general purpose I/O pin(s) to enter specified state
3031  *
3032  * user_gpio fields:
3033  * state - bit indicates target pin state
3034  * smask - set bit indicates watched pin
3035  *
3036  * The wait ends when at least one watched pin enters the specified
3037  * state. When 0 (no error) is returned, user_gpio->state is set to the
3038  * state of all GPIO pins when the wait ends.
3039  *
3040  * Note: Each pin may be a dedicated input, dedicated output, or
3041  * configurable input/output. The number and configuration of pins
3042  * varies with the specific adapter model. Only input pins (dedicated
3043  * or configured) can be monitored with this function.
3044  */
3045 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3046 {
3047         unsigned long flags;
3048         int rc = 0;
3049         struct gpio_desc gpio;
3050         struct cond_wait wait;
3051         u32 state;
3052
3053         if (!info->gpio_present)
3054                 return -EINVAL;
3055         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3056                 return -EFAULT;
3057         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3058                  info->device_name, gpio.state, gpio.smask));
3059         /* ignore output pins identified by set IODR bit */
3060         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3061                 return -EINVAL;
3062         init_cond_wait(&wait, gpio.smask);
3063
3064         spin_lock_irqsave(&info->port_array[0]->lock, flags);
3065         /* enable interrupts for watched pins */
3066         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3067         /* get current pin states */
3068         state = rd_reg32(info, IOVR);
3069
3070         if (gpio.smask & ~(state ^ gpio.state)) {
3071                 /* already in target state */
3072                 gpio.state = state;
3073         } else {
3074                 /* wait for target state */
3075                 add_cond_wait(&info->gpio_wait_q, &wait);
3076                 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3077                 schedule();
3078                 if (signal_pending(current))
3079                         rc = -ERESTARTSYS;
3080                 else
3081                         gpio.state = wait.data;
3082                 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3083                 remove_cond_wait(&info->gpio_wait_q, &wait);
3084         }
3085
3086         /* disable all GPIO interrupts if no waiting processes */
3087         if (info->gpio_wait_q == NULL)
3088                 wr_reg32(info, IOER, 0);
3089         spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3090
3091         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3092                 rc = -EFAULT;
3093         return rc;
3094 }
3095
3096 static int modem_input_wait(struct slgt_info *info,int arg)
3097 {
3098         unsigned long flags;
3099         int rc;
3100         struct mgsl_icount cprev, cnow;
3101         DECLARE_WAITQUEUE(wait, current);
3102
3103         /* save current irq counts */
3104         spin_lock_irqsave(&info->lock,flags);
3105         cprev = info->icount;
3106         add_wait_queue(&info->status_event_wait_q, &wait);
3107         set_current_state(TASK_INTERRUPTIBLE);
3108         spin_unlock_irqrestore(&info->lock,flags);
3109
3110         for(;;) {
3111                 schedule();
3112                 if (signal_pending(current)) {
3113                         rc = -ERESTARTSYS;
3114                         break;
3115                 }
3116
3117                 /* get new irq counts */
3118                 spin_lock_irqsave(&info->lock,flags);
3119                 cnow = info->icount;
3120                 set_current_state(TASK_INTERRUPTIBLE);
3121                 spin_unlock_irqrestore(&info->lock,flags);
3122
3123                 /* if no change, wait aborted for some reason */
3124                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3125                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3126                         rc = -EIO;
3127                         break;
3128                 }
3129
3130                 /* check for change in caller specified modem input */
3131                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3132                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3133                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3134                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3135                         rc = 0;
3136                         break;
3137                 }
3138
3139                 cprev = cnow;
3140         }
3141         remove_wait_queue(&info->status_event_wait_q, &wait);
3142         set_current_state(TASK_RUNNING);
3143         return rc;
3144 }
3145
3146 /*
3147  *  return state of serial control and status signals
3148  */
3149 static int tiocmget(struct tty_struct *tty)
3150 {
3151         struct slgt_info *info = tty->driver_data;
3152         unsigned int result;
3153         unsigned long flags;
3154
3155         spin_lock_irqsave(&info->lock,flags);
3156         get_signals(info);
3157         spin_unlock_irqrestore(&info->lock,flags);
3158
3159         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3160                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3161                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3162                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3163                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3164                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3165
3166         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3167         return result;
3168 }
3169
3170 /*
3171  * set modem control signals (DTR/RTS)
3172  *
3173  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3174  *              TIOCMSET = set/clear signal values
3175  *      value   bit mask for command
3176  */
3177 static int tiocmset(struct tty_struct *tty,
3178                     unsigned int set, unsigned int clear)
3179 {
3180         struct slgt_info *info = tty->driver_data;
3181         unsigned long flags;
3182
3183         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3184
3185         if (set & TIOCM_RTS)
3186                 info->signals |= SerialSignal_RTS;
3187         if (set & TIOCM_DTR)
3188                 info->signals |= SerialSignal_DTR;
3189         if (clear & TIOCM_RTS)
3190                 info->signals &= ~SerialSignal_RTS;
3191         if (clear & TIOCM_DTR)
3192                 info->signals &= ~SerialSignal_DTR;
3193
3194         spin_lock_irqsave(&info->lock,flags);
3195         set_signals(info);
3196         spin_unlock_irqrestore(&info->lock,flags);
3197         return 0;
3198 }
3199
3200 static int carrier_raised(struct tty_port *port)
3201 {
3202         unsigned long flags;
3203         struct slgt_info *info = container_of(port, struct slgt_info, port);
3204
3205         spin_lock_irqsave(&info->lock,flags);
3206         get_signals(info);
3207         spin_unlock_irqrestore(&info->lock,flags);
3208         return (info->signals & SerialSignal_DCD) ? 1 : 0;
3209 }
3210
3211 static void dtr_rts(struct tty_port *port, int on)
3212 {
3213         unsigned long flags;
3214         struct slgt_info *info = container_of(port, struct slgt_info, port);
3215
3216         spin_lock_irqsave(&info->lock,flags);
3217         if (on)
3218                 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3219         else
3220                 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3221         set_signals(info);
3222         spin_unlock_irqrestore(&info->lock,flags);
3223 }
3224
3225
3226 /*
3227  *  block current process until the device is ready to open
3228  */
3229 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3230                            struct slgt_info *info)
3231 {
3232         DECLARE_WAITQUEUE(wait, current);
3233         int             retval;
3234         bool            do_clocal = false;
3235         unsigned long   flags;
3236         int             cd;
3237         struct tty_port *port = &info->port;
3238
3239         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3240
3241         if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3242                 /* nonblock mode is set or port is not enabled */
3243                 tty_port_set_active(port, 1);
3244                 return 0;
3245         }
3246
3247         if (C_CLOCAL(tty))
3248                 do_clocal = true;
3249
3250         /* Wait for carrier detect and the line to become
3251          * free (i.e., not in use by the callout).  While we are in
3252          * this loop, port->count is dropped by one, so that
3253          * close() knows when to free things.  We restore it upon
3254          * exit, either normal or abnormal.
3255          */
3256
3257         retval = 0;
3258         add_wait_queue(&port->open_wait, &wait);
3259
3260         spin_lock_irqsave(&info->lock, flags);
3261         port->count--;
3262         spin_unlock_irqrestore(&info->lock, flags);
3263         port->blocked_open++;
3264
3265         while (1) {
3266                 if (C_BAUD(tty) && tty_port_initialized(port))
3267                         tty_port_raise_dtr_rts(port);
3268
3269                 set_current_state(TASK_INTERRUPTIBLE);
3270
3271                 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3272                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3273                                         -EAGAIN : -ERESTARTSYS;
3274                         break;
3275                 }
3276
3277                 cd = tty_port_carrier_raised(port);
3278                 if (do_clocal || cd)
3279                         break;
3280
3281                 if (signal_pending(current)) {
3282                         retval = -ERESTARTSYS;
3283                         break;
3284                 }
3285
3286                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3287                 tty_unlock(tty);
3288                 schedule();
3289                 tty_lock(tty);
3290         }
3291
3292         set_current_state(TASK_RUNNING);
3293         remove_wait_queue(&port->open_wait, &wait);
3294
3295         if (!tty_hung_up_p(filp))
3296                 port->count++;
3297         port->blocked_open--;
3298
3299         if (!retval)
3300                 tty_port_set_active(port, 1);
3301
3302         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3303         return retval;
3304 }
3305
3306 /*
3307  * allocate buffers used for calling line discipline receive_buf
3308  * directly in synchronous mode
3309  * note: add 5 bytes to max frame size to allow appending
3310  * 32-bit CRC and status byte when configured to do so
3311  */
3312 static int alloc_tmp_rbuf(struct slgt_info *info)
3313 {
3314         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3315         if (info->tmp_rbuf == NULL)
3316                 return -ENOMEM;
3317         /* unused flag buffer to satisfy receive_buf calling interface */
3318         info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3319         if (!info->flag_buf) {
3320                 kfree(info->tmp_rbuf);
3321                 info->tmp_rbuf = NULL;
3322                 return -ENOMEM;
3323         }
3324         return 0;
3325 }
3326
3327 static void free_tmp_rbuf(struct slgt_info *info)
3328 {
3329         kfree(info->tmp_rbuf);
3330         info->tmp_rbuf = NULL;
3331         kfree(info->flag_buf);
3332         info->flag_buf = NULL;
3333 }
3334
3335 /*
3336  * allocate DMA descriptor lists.
3337  */
3338 static int alloc_desc(struct slgt_info *info)
3339 {
3340         unsigned int i;
3341         unsigned int pbufs;
3342
3343         /* allocate memory to hold descriptor lists */
3344         info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
3345                                            &info->bufs_dma_addr);
3346         if (info->bufs == NULL)
3347                 return -ENOMEM;
3348
3349         info->rbufs = (struct slgt_desc*)info->bufs;
3350         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3351
3352         pbufs = (unsigned int)info->bufs_dma_addr;
3353
3354         /*
3355          * Build circular lists of descriptors
3356          */
3357
3358         for (i=0; i < info->rbuf_count; i++) {
3359                 /* physical address of this descriptor */
3360                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3361
3362                 /* physical address of next descriptor */
3363                 if (i == info->rbuf_count - 1)
3364                         info->rbufs[i].next = cpu_to_le32(pbufs);
3365                 else
3366                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3367                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3368         }
3369
3370         for (i=0; i < info->tbuf_count; i++) {
3371                 /* physical address of this descriptor */
3372                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3373
3374                 /* physical address of next descriptor */
3375                 if (i == info->tbuf_count - 1)
3376                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3377                 else
3378                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3379         }
3380
3381         return 0;
3382 }
3383
3384 static void free_desc(struct slgt_info *info)
3385 {
3386         if (info->bufs != NULL) {
3387                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3388                 info->bufs  = NULL;
3389                 info->rbufs = NULL;
3390                 info->tbufs = NULL;
3391         }
3392 }
3393
3394 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3395 {
3396         int i;
3397         for (i=0; i < count; i++) {
3398                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3399                         return -ENOMEM;
3400                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3401         }
3402         return 0;
3403 }
3404
3405 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3406 {
3407         int i;
3408         for (i=0; i < count; i++) {
3409                 if (bufs[i].buf == NULL)
3410                         continue;
3411                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3412                 bufs[i].buf = NULL;
3413         }
3414 }
3415
3416 static int alloc_dma_bufs(struct slgt_info *info)
3417 {
3418         info->rbuf_count = 32;
3419         info->tbuf_count = 32;
3420
3421         if (alloc_desc(info) < 0 ||
3422             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3423             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3424             alloc_tmp_rbuf(info) < 0) {
3425                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3426                 return -ENOMEM;
3427         }
3428         reset_rbufs(info);
3429         return 0;
3430 }
3431
3432 static void free_dma_bufs(struct slgt_info *info)
3433 {
3434         if (info->bufs) {
3435                 free_bufs(info, info->rbufs, info->rbuf_count);
3436                 free_bufs(info, info->tbufs, info->tbuf_count);
3437                 free_desc(info);
3438         }
3439         free_tmp_rbuf(info);
3440 }
3441
3442 static int claim_resources(struct slgt_info *info)
3443 {
3444         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3445                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3446                         info->device_name, info->phys_reg_addr));
3447                 info->init_error = DiagStatus_AddressConflict;
3448                 goto errout;
3449         }
3450         else
3451                 info->reg_addr_requested = true;
3452
3453         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3454         if (!info->reg_addr) {
3455                 DBGERR(("%s can't map device registers, addr=%08X\n",
3456                         info->device_name, info->phys_reg_addr));
3457                 info->init_error = DiagStatus_CantAssignPciResources;
3458                 goto errout;
3459         }
3460         return 0;
3461
3462 errout:
3463         release_resources(info);
3464         return -ENODEV;
3465 }
3466