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i915: fix AR register restore.
[linux-2.6/mini2440.git] / drivers / char / synclink_gt.c
blob1f954acf2bac49125be4b18f0167eb437ec0cbe0
1 /*
2 * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink GT serial adapters.
5 *
6 * written by Paul Fulghum for Microgate Corporation
7 * paulkf@microgate.com
8 *
9 * Microgate and SyncLink are trademarks of Microgate Corporation
10 *
11 * This code is released under the GNU General Public License (GPL)
12 *
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23 * OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 /*
27 * DEBUG OUTPUT DEFINITIONS
28 *
29 * uncomment lines below to enable specific types of debug output
30 *
31 * DBGINFO information - most verbose output
32 * DBGERR serious errors
33 * DBGBH bottom half service routine debugging
34 * DBGISR interrupt service routine debugging
35 * DBGDATA output receive and transmit data
36 * DBGTBUF output transmit DMA buffers and registers
37 * DBGRBUF output receive DMA buffers and registers
38 */
39
40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45 //#define DBGTBUF(info) dump_tbufs(info)
46 //#define DBGRBUF(info) dump_rbufs(info)
47
48
49 #include <linux/module.h>
50 #include <linux/version.h>
51 #include <linux/errno.h>
52 #include <linux/signal.h>
53 #include <linux/sched.h>
54 #include <linux/timer.h>
55 #include <linux/interrupt.h>
56 #include <linux/pci.h>
57 #include <linux/tty.h>
58 #include <linux/tty_flip.h>
59 #include <linux/serial.h>
60 #include <linux/major.h>
61 #include <linux/string.h>
62 #include <linux/fcntl.h>
63 #include <linux/ptrace.h>
64 #include <linux/ioport.h>
65 #include <linux/mm.h>
66 #include <linux/slab.h>
67 #include <linux/netdevice.h>
68 #include <linux/vmalloc.h>
69 #include <linux/init.h>
70 #include <linux/delay.h>
71 #include <linux/ioctl.h>
72 #include <linux/termios.h>
73 #include <linux/bitops.h>
74 #include <linux/workqueue.h>
75 #include <linux/hdlc.h>
76 #include <linux/synclink.h>
77
78 #include <asm/system.h>
79 #include <asm/io.h>
80 #include <asm/irq.h>
81 #include <asm/dma.h>
82 #include <asm/types.h>
83 #include <asm/uaccess.h>
84
85 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
86 #define SYNCLINK_GENERIC_HDLC 1
87 #else
88 #define SYNCLINK_GENERIC_HDLC 0
89 #endif
90
91 /*
92 * module identification
93 */
94 static char *driver_name = "SyncLink GT";
95 static char *driver_version = "$Revision: 4.50 $";
96 static char *tty_driver_name = "synclink_gt";
97 static char *tty_dev_prefix = "ttySLG";
98 MODULE_LICENSE("GPL");
99 #define MGSL_MAGIC 0x5401
100 #define MAX_DEVICES 32
101
102 static struct pci_device_id pci_table[] = {
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107 {0,}, /* terminate list */
108 };
109 MODULE_DEVICE_TABLE(pci, pci_table);
110
111 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
112 static void remove_one(struct pci_dev *dev);
113 static struct pci_driver pci_driver = {
114 .name = "synclink_gt",
115 .id_table = pci_table,
116 .probe = init_one,
117 .remove = __devexit_p(remove_one),
118 };
119
120 static int pci_registered;
121
122 /*
123 * module configuration and status
124 */
125 static struct slgt_info *slgt_device_list;
126 static int slgt_device_count;
127
128 static int ttymajor;
129 static int debug_level;
130 static int maxframe[MAX_DEVICES];
131 static int dosyncppp[MAX_DEVICES];
132
133 module_param(ttymajor, int, 0);
134 module_param(debug_level, int, 0);
135 module_param_array(maxframe, int, NULL, 0);
136 module_param_array(dosyncppp, int, NULL, 0);
137
138 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
139 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
140 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
141 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
142
143 /*
144 * tty support and callbacks
145 */
146 static struct tty_driver *serial_driver;
147
148 static int open(struct tty_struct *tty, struct file * filp);
149 static void close(struct tty_struct *tty, struct file * filp);
150 static void hangup(struct tty_struct *tty);
151 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
152
153 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
154 static void put_char(struct tty_struct *tty, unsigned char ch);
155 static void send_xchar(struct tty_struct *tty, char ch);
156 static void wait_until_sent(struct tty_struct *tty, int timeout);
157 static int write_room(struct tty_struct *tty);
158 static void flush_chars(struct tty_struct *tty);
159 static void flush_buffer(struct tty_struct *tty);
160 static void tx_hold(struct tty_struct *tty);
161 static void tx_release(struct tty_struct *tty);
162
163 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
164 static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
165 static int chars_in_buffer(struct tty_struct *tty);
166 static void throttle(struct tty_struct * tty);
167 static void unthrottle(struct tty_struct * tty);
168 static void set_break(struct tty_struct *tty, int break_state);
169
170 /*
171 * generic HDLC support and callbacks
172 */
173 #if SYNCLINK_GENERIC_HDLC
174 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
175 static void hdlcdev_tx_done(struct slgt_info *info);
176 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
177 static int hdlcdev_init(struct slgt_info *info);
178 static void hdlcdev_exit(struct slgt_info *info);
179 #endif
180
181
182 /*
183 * device specific structures, macros and functions
184 */
185
186 #define SLGT_MAX_PORTS 4
187 #define SLGT_REG_SIZE 256
188
189 /*
190 * conditional wait facility
191 */
192 struct cond_wait {
193 struct cond_wait *next;
194 wait_queue_head_t q;
195 wait_queue_t wait;
196 unsigned int data;
197 };
198 static void init_cond_wait(struct cond_wait *w, unsigned int data);
199 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
200 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
201 static void flush_cond_wait(struct cond_wait **head);
202
203 /*
204 * DMA buffer descriptor and access macros
205 */
206 struct slgt_desc
207 {
208 __le16 count;
209 __le16 status;
210 __le32 pbuf; /* physical address of data buffer */
211 __le32 next; /* physical address of next descriptor */
212
213 /* driver book keeping */
214 char *buf; /* virtual address of data buffer */
215 unsigned int pdesc; /* physical address of this descriptor */
216 dma_addr_t buf_dma_addr;
217 };
218
219 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
220 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
221 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
222 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
223 #define desc_count(a) (le16_to_cpu((a).count))
224 #define desc_status(a) (le16_to_cpu((a).status))
225 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
226 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
227 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
228 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
229 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
230
231 struct _input_signal_events {
232 int ri_up;
233 int ri_down;
234 int dsr_up;
235 int dsr_down;
236 int dcd_up;
237 int dcd_down;
238 int cts_up;
239 int cts_down;
240 };
241
242 /*
243 * device instance data structure
244 */
245 struct slgt_info {
246 void *if_ptr; /* General purpose pointer (used by SPPP) */
247
248 struct slgt_info *next_device; /* device list link */
249
250 int magic;
251 int flags;
252
253 char device_name[25];
254 struct pci_dev *pdev;
255
256 int port_count; /* count of ports on adapter */
257 int adapter_num; /* adapter instance number */
258 int port_num; /* port instance number */
259
260 /* array of pointers to port contexts on this adapter */
261 struct slgt_info *port_array[SLGT_MAX_PORTS];
262
263 int count; /* count of opens */
264 int line; /* tty line instance number */
265 unsigned short close_delay;
266 unsigned short closing_wait; /* time to wait before closing */
267
268 struct mgsl_icount icount;
269
270 struct tty_struct *tty;
271 int timeout;
272 int x_char; /* xon/xoff character */
273 int blocked_open; /* # of blocked opens */
274 unsigned int read_status_mask;
275 unsigned int ignore_status_mask;
276
277 wait_queue_head_t open_wait;
278 wait_queue_head_t close_wait;
279
280 wait_queue_head_t status_event_wait_q;
281 wait_queue_head_t event_wait_q;
282 struct timer_list tx_timer;
283 struct timer_list rx_timer;
284
285 unsigned int gpio_present;
286 struct cond_wait *gpio_wait_q;
287
288 spinlock_t lock; /* spinlock for synchronizing with ISR */
289
290 struct work_struct task;
291 u32 pending_bh;
292 int bh_requested;
293 int bh_running;
294
295 int isr_overflow;
296 int irq_requested; /* nonzero if IRQ requested */
297 int irq_occurred; /* for diagnostics use */
298
299 /* device configuration */
300
301 unsigned int bus_type;
302 unsigned int irq_level;
303 unsigned long irq_flags;
304
305 unsigned char __iomem * reg_addr; /* memory mapped registers address */
306 u32 phys_reg_addr;
307 int reg_addr_requested;
308
309 MGSL_PARAMS params; /* communications parameters */
310 u32 idle_mode;
311 u32 max_frame_size; /* as set by device config */
312
313 unsigned int raw_rx_size;
314 unsigned int if_mode;
315
316 /* device status */
317
318 int rx_enabled;
319 int rx_restart;
320
321 int tx_enabled;
322 int tx_active;
323
324 unsigned char signals; /* serial signal states */
325 int init_error; /* initialization error */
326
327 unsigned char *tx_buf;
328 int tx_count;
329
330 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
331 char char_buf[MAX_ASYNC_BUFFER_SIZE];
332 BOOLEAN drop_rts_on_tx_done;
333 struct _input_signal_events input_signal_events;
334
335 int dcd_chkcount; /* check counts to prevent */
336 int cts_chkcount; /* too many IRQs if a signal */
337 int dsr_chkcount; /* is floating */
338 int ri_chkcount;
339
340 char *bufs; /* virtual address of DMA buffer lists */
341 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
342
343 unsigned int rbuf_count;
344 struct slgt_desc *rbufs;
345 unsigned int rbuf_current;
346 unsigned int rbuf_index;
347
348 unsigned int tbuf_count;
349 struct slgt_desc *tbufs;
350 unsigned int tbuf_current;
351 unsigned int tbuf_start;
352
353 unsigned char *tmp_rbuf;
354 unsigned int tmp_rbuf_count;
355
356 /* SPPP/Cisco HDLC device parts */
357
358 int netcount;
359 int dosyncppp;
360 spinlock_t netlock;
361 #if SYNCLINK_GENERIC_HDLC
362 struct net_device *netdev;
363 #endif
364
365 };
366
367 static MGSL_PARAMS default_params = {
368 .mode = MGSL_MODE_HDLC,
369 .loopback = 0,
370 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
371 .encoding = HDLC_ENCODING_NRZI_SPACE,
372 .clock_speed = 0,
373 .addr_filter = 0xff,
374 .crc_type = HDLC_CRC_16_CCITT,
375 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
376 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
377 .data_rate = 9600,
378 .data_bits = 8,
379 .stop_bits = 1,
380 .parity = ASYNC_PARITY_NONE
381 };
382
383
384 #define BH_RECEIVE 1
385 #define BH_TRANSMIT 2
386 #define BH_STATUS 4
387 #define IO_PIN_SHUTDOWN_LIMIT 100
388
389 #define DMABUFSIZE 256
390 #define DESC_LIST_SIZE 4096
391
392 #define MASK_PARITY BIT1
393 #define MASK_FRAMING BIT0
394 #define MASK_BREAK BIT14
395 #define MASK_OVERRUN BIT4
396
397 #define GSR 0x00 /* global status */
398 #define JCR 0x04 /* JTAG control */
399 #define IODR 0x08 /* GPIO direction */
400 #define IOER 0x0c /* GPIO interrupt enable */
401 #define IOVR 0x10 /* GPIO value */
402 #define IOSR 0x14 /* GPIO interrupt status */
403 #define TDR 0x80 /* tx data */
404 #define RDR 0x80 /* rx data */
405 #define TCR 0x82 /* tx control */
406 #define TIR 0x84 /* tx idle */
407 #define TPR 0x85 /* tx preamble */
408 #define RCR 0x86 /* rx control */
409 #define VCR 0x88 /* V.24 control */
410 #define CCR 0x89 /* clock control */
411 #define BDR 0x8a /* baud divisor */
412 #define SCR 0x8c /* serial control */
413 #define SSR 0x8e /* serial status */
414 #define RDCSR 0x90 /* rx DMA control/status */
415 #define TDCSR 0x94 /* tx DMA control/status */
416 #define RDDAR 0x98 /* rx DMA descriptor address */
417 #define TDDAR 0x9c /* tx DMA descriptor address */
418
419 #define RXIDLE BIT14
420 #define RXBREAK BIT14
421 #define IRQ_TXDATA BIT13
422 #define IRQ_TXIDLE BIT12
423 #define IRQ_TXUNDER BIT11 /* HDLC */
424 #define IRQ_RXDATA BIT10
425 #define IRQ_RXIDLE BIT9 /* HDLC */
426 #define IRQ_RXBREAK BIT9 /* async */
427 #define IRQ_RXOVER BIT8
428 #define IRQ_DSR BIT7
429 #define IRQ_CTS BIT6
430 #define IRQ_DCD BIT5
431 #define IRQ_RI BIT4
432 #define IRQ_ALL 0x3ff0
433 #define IRQ_MASTER BIT0
434
435 #define slgt_irq_on(info, mask) \
436 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
437 #define slgt_irq_off(info, mask) \
438 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
439
440 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
441 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
442 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
443 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
444 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
445 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
446
447 static void msc_set_vcr(struct slgt_info *info);
448
449 static int startup(struct slgt_info *info);
450 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
451 static void shutdown(struct slgt_info *info);
452 static void program_hw(struct slgt_info *info);
453 static void change_params(struct slgt_info *info);
454
455 static int register_test(struct slgt_info *info);
456 static int irq_test(struct slgt_info *info);
457 static int loopback_test(struct slgt_info *info);
458 static int adapter_test(struct slgt_info *info);
459
460 static void reset_adapter(struct slgt_info *info);
461 static void reset_port(struct slgt_info *info);
462 static void async_mode(struct slgt_info *info);
463 static void sync_mode(struct slgt_info *info);
464
465 static void rx_stop(struct slgt_info *info);
466 static void rx_start(struct slgt_info *info);
467 static void reset_rbufs(struct slgt_info *info);
468 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
469 static void rdma_reset(struct slgt_info *info);
470 static int rx_get_frame(struct slgt_info *info);
471 static int rx_get_buf(struct slgt_info *info);
472
473 static void tx_start(struct slgt_info *info);
474 static void tx_stop(struct slgt_info *info);
475 static void tx_set_idle(struct slgt_info *info);
476 static unsigned int free_tbuf_count(struct slgt_info *info);
477 static void reset_tbufs(struct slgt_info *info);
478 static void tdma_reset(struct slgt_info *info);
479 static void tdma_start(struct slgt_info *info);
480 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
481
482 static void get_signals(struct slgt_info *info);
483 static void set_signals(struct slgt_info *info);
484 static void enable_loopback(struct slgt_info *info);
485 static void set_rate(struct slgt_info *info, u32 data_rate);
486
487 static int bh_action(struct slgt_info *info);
488 static void bh_handler(struct work_struct *work);
489 static void bh_transmit(struct slgt_info *info);
490 static void isr_serial(struct slgt_info *info);
491 static void isr_rdma(struct slgt_info *info);
492 static void isr_txeom(struct slgt_info *info, unsigned short status);
493 static void isr_tdma(struct slgt_info *info);
494 static irqreturn_t slgt_interrupt(int irq, void *dev_id);
495
496 static int alloc_dma_bufs(struct slgt_info *info);
497 static void free_dma_bufs(struct slgt_info *info);
498 static int alloc_desc(struct slgt_info *info);
499 static void free_desc(struct slgt_info *info);
500 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
501 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
502
503 static int alloc_tmp_rbuf(struct slgt_info *info);
504 static void free_tmp_rbuf(struct slgt_info *info);
505
506 static void tx_timeout(unsigned long context);
507 static void rx_timeout(unsigned long context);
508
509 /*
510 * ioctl handlers
511 */
512 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
513 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
514 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
515 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
516 static int set_txidle(struct slgt_info *info, int idle_mode);
517 static int tx_enable(struct slgt_info *info, int enable);
518 static int tx_abort(struct slgt_info *info);
519 static int rx_enable(struct slgt_info *info, int enable);
520 static int modem_input_wait(struct slgt_info *info,int arg);
521 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
522 static int tiocmget(struct tty_struct *tty, struct file *file);
523 static int tiocmset(struct tty_struct *tty, struct file *file,
524 unsigned int set, unsigned int clear);
525 static void set_break(struct tty_struct *tty, int break_state);
526 static int get_interface(struct slgt_info *info, int __user *if_mode);
527 static int set_interface(struct slgt_info *info, int if_mode);
528 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
529 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
530 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
531
532 /*
533 * driver functions
534 */
535 static void add_device(struct slgt_info *info);
536 static void device_init(int adapter_num, struct pci_dev *pdev);
537 static int claim_resources(struct slgt_info *info);
538 static void release_resources(struct slgt_info *info);
539
540 /*
541 * DEBUG OUTPUT CODE
542 */
543 #ifndef DBGINFO
544 #define DBGINFO(fmt)
545 #endif
546 #ifndef DBGERR
547 #define DBGERR(fmt)
548 #endif
549 #ifndef DBGBH
550 #define DBGBH(fmt)
551 #endif
552 #ifndef DBGISR
553 #define DBGISR(fmt)
554 #endif
555
556 #ifdef DBGDATA
557 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
558 {
559 int i;
560 int linecount;
561 printk("%s %s data:\n",info->device_name, label);
562 while(count) {
563 linecount = (count > 16) ? 16 : count;
564 for(i=0; i < linecount; i++)
565 printk("%02X ",(unsigned char)data[i]);
566 for(;i<17;i++)
567 printk(" ");
568 for(i=0;i<linecount;i++) {
569 if (data[i]>=040 && data[i]<=0176)
570 printk("%c",data[i]);
571 else
572 printk(".");
573 }
574 printk("\n");
575 data += linecount;
576 count -= linecount;
577 }
578 }
579 #else
580 #define DBGDATA(info, buf, size, label)
581 #endif
582
583 #ifdef DBGTBUF
584 static void dump_tbufs(struct slgt_info *info)
585 {
586 int i;
587 printk("tbuf_current=%d\n", info->tbuf_current);
588 for (i=0 ; i < info->tbuf_count ; i++) {
589 printk("%d: count=%04X status=%04X\n",
590 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
591 }
592 }
593 #else
594 #define DBGTBUF(info)
595 #endif
596
597 #ifdef DBGRBUF
598 static void dump_rbufs(struct slgt_info *info)
599 {
600 int i;
601 printk("rbuf_current=%d\n", info->rbuf_current);
602 for (i=0 ; i < info->rbuf_count ; i++) {
603 printk("%d: count=%04X status=%04X\n",
604 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
605 }
606 }
607 #else
608 #define DBGRBUF(info)
609 #endif
610
611 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
612 {
613 #ifdef SANITY_CHECK
614 if (!info) {
615 printk("null struct slgt_info for (%s) in %s\n", devname, name);
616 return 1;
617 }
618 if (info->magic != MGSL_MAGIC) {
619 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
620 return 1;
621 }
622 #else
623 if (!info)
624 return 1;
625 #endif
626 return 0;
627 }
628
629 /**
630 * line discipline callback wrappers
631 *
632 * The wrappers maintain line discipline references
633 * while calling into the line discipline.
634 *
635 * ldisc_receive_buf - pass receive data to line discipline
636 */
637 static void ldisc_receive_buf(struct tty_struct *tty,
638 const __u8 *data, char *flags, int count)
639 {
640 struct tty_ldisc *ld;
641 if (!tty)
642 return;
643 ld = tty_ldisc_ref(tty);
644 if (ld) {
645 if (ld->receive_buf)
646 ld->receive_buf(tty, data, flags, count);
647 tty_ldisc_deref(ld);
648 }
649 }
650
651 /* tty callbacks */
652
653 static int open(struct tty_struct *tty, struct file *filp)
654 {
655 struct slgt_info *info;
656 int retval, line;
657 unsigned long flags;
658
659 line = tty->index;
660 if ((line < 0) || (line >= slgt_device_count)) {
661 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
662 return -ENODEV;
663 }
664
665 info = slgt_device_list;
666 while(info && info->line != line)
667 info = info->next_device;
668 if (sanity_check(info, tty->name, "open"))
669 return -ENODEV;
670 if (info->init_error) {
671 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
672 return -ENODEV;
673 }
674
675 tty->driver_data = info;
676 info->tty = tty;
677
678 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
679
680 /* If port is closing, signal caller to try again */
681 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
682 if (info->flags & ASYNC_CLOSING)
683 interruptible_sleep_on(&info->close_wait);
684 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
685 -EAGAIN : -ERESTARTSYS);
686 goto cleanup;
687 }
688
689 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
690
691 spin_lock_irqsave(&info->netlock, flags);
692 if (info->netcount) {
693 retval = -EBUSY;
694 spin_unlock_irqrestore(&info->netlock, flags);
695 goto cleanup;
696 }
697 info->count++;
698 spin_unlock_irqrestore(&info->netlock, flags);
699
700 if (info->count == 1) {
701 /* 1st open on this device, init hardware */
702 retval = startup(info);
703 if (retval < 0)
704 goto cleanup;
705 }
706
707 retval = block_til_ready(tty, filp, info);
708 if (retval) {
709 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
710 goto cleanup;
711 }
712
713 retval = 0;
714
715 cleanup:
716 if (retval) {
717 if (tty->count == 1)
718 info->tty = NULL; /* tty layer will release tty struct */
719 if(info->count)
720 info->count--;
721 }
722
723 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
724 return retval;
725 }
726
727 static void close(struct tty_struct *tty, struct file *filp)
728 {
729 struct slgt_info *info = tty->driver_data;
730
731 if (sanity_check(info, tty->name, "close"))
732 return;
733 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
734
735 if (!info->count)
736 return;
737
738 if (tty_hung_up_p(filp))
739 goto cleanup;
740
741 if ((tty->count == 1) && (info->count != 1)) {
742 /*
743 * tty->count is 1 and the tty structure will be freed.
744 * info->count should be one in this case.
745 * if it's not, correct it so that the port is shutdown.
746 */
747 DBGERR(("%s close: bad refcount; tty->count=1, "
748 "info->count=%d\n", info->device_name, info->count));
749 info->count = 1;
750 }
751
752 info->count--;
753
754 /* if at least one open remaining, leave hardware active */
755 if (info->count)
756 goto cleanup;
757
758 info->flags |= ASYNC_CLOSING;
759
760 /* set tty->closing to notify line discipline to
761 * only process XON/XOFF characters. Only the N_TTY
762 * discipline appears to use this (ppp does not).
763 */
764 tty->closing = 1;
765
766 /* wait for transmit data to clear all layers */
767
768 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
769 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
770 tty_wait_until_sent(tty, info->closing_wait);
771 }
772
773 if (info->flags & ASYNC_INITIALIZED)
774 wait_until_sent(tty, info->timeout);
775 if (tty->driver->flush_buffer)
776 tty->driver->flush_buffer(tty);
777 tty_ldisc_flush(tty);
778
779 shutdown(info);
780
781 tty->closing = 0;
782 info->tty = NULL;
783
784 if (info->blocked_open) {
785 if (info->close_delay) {
786 msleep_interruptible(jiffies_to_msecs(info->close_delay));
787 }
788 wake_up_interruptible(&info->open_wait);
789 }
790
791 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
792
793 wake_up_interruptible(&info->close_wait);
794
795 cleanup:
796 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
797 }
798
799 static void hangup(struct tty_struct *tty)
800 {
801 struct slgt_info *info = tty->driver_data;
802
803 if (sanity_check(info, tty->name, "hangup"))
804 return;
805 DBGINFO(("%s hangup\n", info->device_name));
806
807 flush_buffer(tty);
808 shutdown(info);
809
810 info->count = 0;
811 info->flags &= ~ASYNC_NORMAL_ACTIVE;
812 info->tty = NULL;
813
814 wake_up_interruptible(&info->open_wait);
815 }
816
817 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
818 {
819 struct slgt_info *info = tty->driver_data;
820 unsigned long flags;
821
822 DBGINFO(("%s set_termios\n", tty->driver->name));
823
824 change_params(info);
825
826 /* Handle transition to B0 status */
827 if (old_termios->c_cflag & CBAUD &&
828 !(tty->termios->c_cflag & CBAUD)) {
829 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
830 spin_lock_irqsave(&info->lock,flags);
831 set_signals(info);
832 spin_unlock_irqrestore(&info->lock,flags);
833 }
834
835 /* Handle transition away from B0 status */
836 if (!(old_termios->c_cflag & CBAUD) &&
837 tty->termios->c_cflag & CBAUD) {
838 info->signals |= SerialSignal_DTR;
839 if (!(tty->termios->c_cflag & CRTSCTS) ||
840 !test_bit(TTY_THROTTLED, &tty->flags)) {
841 info->signals |= SerialSignal_RTS;
842 }
843 spin_lock_irqsave(&info->lock,flags);
844 set_signals(info);
845 spin_unlock_irqrestore(&info->lock,flags);
846 }
847
848 /* Handle turning off CRTSCTS */
849 if (old_termios->c_cflag & CRTSCTS &&
850 !(tty->termios->c_cflag & CRTSCTS)) {
851 tty->hw_stopped = 0;
852 tx_release(tty);
853 }
854 }
855
856 static int write(struct tty_struct *tty,
857 const unsigned char *buf, int count)
858 {
859 int ret = 0;
860 struct slgt_info *info = tty->driver_data;
861 unsigned long flags;
862
863 if (sanity_check(info, tty->name, "write"))
864 goto cleanup;
865 DBGINFO(("%s write count=%d\n", info->device_name, count));
866
867 if (!info->tx_buf)
868 goto cleanup;
869
870 if (count > info->max_frame_size) {
871 ret = -EIO;
872 goto cleanup;
873 }
874
875 if (!count)
876 goto cleanup;
877
878 if (info->params.mode == MGSL_MODE_RAW ||
879 info->params.mode == MGSL_MODE_MONOSYNC ||
880 info->params.mode == MGSL_MODE_BISYNC) {
881 unsigned int bufs_needed = (count/DMABUFSIZE);
882 unsigned int bufs_free = free_tbuf_count(info);
883 if (count % DMABUFSIZE)
884 ++bufs_needed;
885 if (bufs_needed > bufs_free)
886 goto cleanup;
887 } else {
888 if (info->tx_active)
889 goto cleanup;
890 if (info->tx_count) {
891 /* send accumulated data from send_char() calls */
892 /* as frame and wait before accepting more data. */
893 tx_load(info, info->tx_buf, info->tx_count);
894 goto start;
895 }
896 }
897
898 ret = info->tx_count = count;
899 tx_load(info, buf, count);
900 goto start;
901
902 start:
903 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
904 spin_lock_irqsave(&info->lock,flags);
905 if (!info->tx_active)
906 tx_start(info);
907 else
908 tdma_start(info);
909 spin_unlock_irqrestore(&info->lock,flags);
910 }
911
912 cleanup:
913 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
914 return ret;
915 }
916
917 static void put_char(struct tty_struct *tty, unsigned char ch)
918 {
919 struct slgt_info *info = tty->driver_data;
920 unsigned long flags;
921
922 if (sanity_check(info, tty->name, "put_char"))
923 return;
924 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
925 if (!info->tx_buf)
926 return;
927 spin_lock_irqsave(&info->lock,flags);
928 if (!info->tx_active && (info->tx_count < info->max_frame_size))
929 info->tx_buf[info->tx_count++] = ch;
930 spin_unlock_irqrestore(&info->lock,flags);
931 }
932
933 static void send_xchar(struct tty_struct *tty, char ch)
934 {
935 struct slgt_info *info = tty->driver_data;
936 unsigned long flags;
937
938 if (sanity_check(info, tty->name, "send_xchar"))
939 return;
940 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
941 info->x_char = ch;
942 if (ch) {
943 spin_lock_irqsave(&info->lock,flags);
944 if (!info->tx_enabled)
945 tx_start(info);
946 spin_unlock_irqrestore(&info->lock,flags);
947 }
948 }
949
950 static void wait_until_sent(struct tty_struct *tty, int timeout)
951 {
952 struct slgt_info *info = tty->driver_data;
953 unsigned long orig_jiffies, char_time;
954
955 if (!info )
956 return;
957 if (sanity_check(info, tty->name, "wait_until_sent"))
958 return;
959 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
960 if (!(info->flags & ASYNC_INITIALIZED))
961 goto exit;
962
963 orig_jiffies = jiffies;
964
965 /* Set check interval to 1/5 of estimated time to
966 * send a character, and make it at least 1. The check
967 * interval should also be less than the timeout.
968 * Note: use tight timings here to satisfy the NIST-PCTS.
969 */
970
971 if (info->params.data_rate) {
972 char_time = info->timeout/(32 * 5);
973 if (!char_time)
974 char_time++;
975 } else
976 char_time = 1;
977
978 if (timeout)
979 char_time = min_t(unsigned long, char_time, timeout);
980
981 while (info->tx_active) {
982 msleep_interruptible(jiffies_to_msecs(char_time));
983 if (signal_pending(current))
984 break;
985 if (timeout && time_after(jiffies, orig_jiffies + timeout))
986 break;
987 }
988
989 exit:
990 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
991 }
992
993 static int write_room(struct tty_struct *tty)
994 {
995 struct slgt_info *info = tty->driver_data;
996 int ret;
997
998 if (sanity_check(info, tty->name, "write_room"))
999 return 0;
1000 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1001 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
1002 return ret;
1003 }
1004
1005 static void flush_chars(struct tty_struct *tty)
1006 {
1007 struct slgt_info *info = tty->driver_data;
1008 unsigned long flags;
1009
1010 if (sanity_check(info, tty->name, "flush_chars"))
1011 return;
1012 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1013
1014 if (info->tx_count <= 0 || tty->stopped ||
1015 tty->hw_stopped || !info->tx_buf)
1016 return;
1017
1018 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1019
1020 spin_lock_irqsave(&info->lock,flags);
1021 if (!info->tx_active && info->tx_count) {
1022 tx_load(info, info->tx_buf,info->tx_count);
1023 tx_start(info);
1024 }
1025 spin_unlock_irqrestore(&info->lock,flags);
1026 }
1027
1028 static void flush_buffer(struct tty_struct *tty)
1029 {
1030 struct slgt_info *info = tty->driver_data;
1031 unsigned long flags;
1032
1033 if (sanity_check(info, tty->name, "flush_buffer"))
1034 return;
1035 DBGINFO(("%s flush_buffer\n", info->device_name));
1036
1037 spin_lock_irqsave(&info->lock,flags);
1038 if (!info->tx_active)
1039 info->tx_count = 0;
1040 spin_unlock_irqrestore(&info->lock,flags);
1041
1042 tty_wakeup(tty);
1043 }
1044
1045 /*
1046 * throttle (stop) transmitter
1047 */
1048 static void tx_hold(struct tty_struct *tty)
1049 {
1050 struct slgt_info *info = tty->driver_data;
1051 unsigned long flags;
1052
1053 if (sanity_check(info, tty->name, "tx_hold"))
1054 return;
1055 DBGINFO(("%s tx_hold\n", info->device_name));
1056 spin_lock_irqsave(&info->lock,flags);
1057 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1058 tx_stop(info);
1059 spin_unlock_irqrestore(&info->lock,flags);
1060 }
1061
1062 /*
1063 * release (start) transmitter
1064 */
1065 static void tx_release(struct tty_struct *tty)
1066 {
1067 struct slgt_info *info = tty->driver_data;
1068 unsigned long flags;
1069
1070 if (sanity_check(info, tty->name, "tx_release"))
1071 return;
1072 DBGINFO(("%s tx_release\n", info->device_name));
1073 spin_lock_irqsave(&info->lock,flags);
1074 if (!info->tx_active && info->tx_count) {
1075 tx_load(info, info->tx_buf, info->tx_count);
1076 tx_start(info);
1077 }
1078 spin_unlock_irqrestore(&info->lock,flags);
1079 }
1080
1081 /*
1082 * Service an IOCTL request
1083 *
1084 * Arguments
1085 *
1086 * tty pointer to tty instance data
1087 * file pointer to associated file object for device
1088 * cmd IOCTL command code
1089 * arg command argument/context
1090 *
1091 * Return 0 if success, otherwise error code
1092 */
1093 static int ioctl(struct tty_struct *tty, struct file *file,
1094 unsigned int cmd, unsigned long arg)
1095 {
1096 struct slgt_info *info = tty->driver_data;
1097 struct mgsl_icount cnow; /* kernel counter temps */
1098 struct serial_icounter_struct __user *p_cuser; /* user space */
1099 unsigned long flags;
1100 void __user *argp = (void __user *)arg;
1101
1102 if (sanity_check(info, tty->name, "ioctl"))
1103 return -ENODEV;
1104 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1105
1106 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1107 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1108 if (tty->flags & (1 << TTY_IO_ERROR))
1109 return -EIO;
1110 }
1111
1112 switch (cmd) {
1113 case MGSL_IOCGPARAMS:
1114 return get_params(info, argp);
1115 case MGSL_IOCSPARAMS:
1116 return set_params(info, argp);
1117 case MGSL_IOCGTXIDLE:
1118 return get_txidle(info, argp);
1119 case MGSL_IOCSTXIDLE:
1120 return set_txidle(info, (int)arg);
1121 case MGSL_IOCTXENABLE:
1122 return tx_enable(info, (int)arg);
1123 case MGSL_IOCRXENABLE:
1124 return rx_enable(info, (int)arg);
1125 case MGSL_IOCTXABORT:
1126 return tx_abort(info);
1127 case MGSL_IOCGSTATS:
1128 return get_stats(info, argp);
1129 case MGSL_IOCWAITEVENT:
1130 return wait_mgsl_event(info, argp);
1131 case TIOCMIWAIT:
1132 return modem_input_wait(info,(int)arg);
1133 case MGSL_IOCGIF:
1134 return get_interface(info, argp);
1135 case MGSL_IOCSIF:
1136 return set_interface(info,(int)arg);
1137 case MGSL_IOCSGPIO:
1138 return set_gpio(info, argp);
1139 case MGSL_IOCGGPIO:
1140 return get_gpio(info, argp);
1141 case MGSL_IOCWAITGPIO:
1142 return wait_gpio(info, argp);
1143 case TIOCGICOUNT:
1144 spin_lock_irqsave(&info->lock,flags);
1145 cnow = info->icount;
1146 spin_unlock_irqrestore(&info->lock,flags);
1147 p_cuser = argp;
1148 if (put_user(cnow.cts, &p_cuser->cts) ||
1149 put_user(cnow.dsr, &p_cuser->dsr) ||
1150 put_user(cnow.rng, &p_cuser->rng) ||
1151 put_user(cnow.dcd, &p_cuser->dcd) ||
1152 put_user(cnow.rx, &p_cuser->rx) ||
1153 put_user(cnow.tx, &p_cuser->tx) ||
1154 put_user(cnow.frame, &p_cuser->frame) ||
1155 put_user(cnow.overrun, &p_cuser->overrun) ||
1156 put_user(cnow.parity, &p_cuser->parity) ||
1157 put_user(cnow.brk, &p_cuser->brk) ||
1158 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1159 return -EFAULT;
1160 return 0;
1161 default:
1162 return -ENOIOCTLCMD;
1163 }
1164 return 0;
1165 }
1166
1167 /*
1168 * support for 32 bit ioctl calls on 64 bit systems
1169 */
1170 #ifdef CONFIG_COMPAT
1171 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1172 {
1173 struct MGSL_PARAMS32 tmp_params;
1174
1175 DBGINFO(("%s get_params32\n", info->device_name));
1176 tmp_params.mode = (compat_ulong_t)info->params.mode;
1177 tmp_params.loopback = info->params.loopback;
1178 tmp_params.flags = info->params.flags;
1179 tmp_params.encoding = info->params.encoding;
1180 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1181 tmp_params.addr_filter = info->params.addr_filter;
1182 tmp_params.crc_type = info->params.crc_type;
1183 tmp_params.preamble_length = info->params.preamble_length;
1184 tmp_params.preamble = info->params.preamble;
1185 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1186 tmp_params.data_bits = info->params.data_bits;
1187 tmp_params.stop_bits = info->params.stop_bits;
1188 tmp_params.parity = info->params.parity;
1189 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1190 return -EFAULT;
1191 return 0;
1192 }
1193
1194 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1195 {
1196 struct MGSL_PARAMS32 tmp_params;
1197
1198 DBGINFO(("%s set_params32\n", info->device_name));
1199 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1200 return -EFAULT;
1201
1202 spin_lock(&info->lock);
1203 info->params.mode = tmp_params.mode;
1204 info->params.loopback = tmp_params.loopback;
1205 info->params.flags = tmp_params.flags;
1206 info->params.encoding = tmp_params.encoding;
1207 info->params.clock_speed = tmp_params.clock_speed;
1208 info->params.addr_filter = tmp_params.addr_filter;
1209 info->params.crc_type = tmp_params.crc_type;
1210 info->params.preamble_length = tmp_params.preamble_length;
1211 info->params.preamble = tmp_params.preamble;
1212 info->params.data_rate = tmp_params.data_rate;
1213 info->params.data_bits = tmp_params.data_bits;
1214 info->params.stop_bits = tmp_params.stop_bits;
1215 info->params.parity = tmp_params.parity;
1216 spin_unlock(&info->lock);
1217
1218 change_params(info);
1219
1220 return 0;
1221 }
1222
1223 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1224 unsigned int cmd, unsigned long arg)
1225 {
1226 struct slgt_info *info = tty->driver_data;
1227 int rc = -ENOIOCTLCMD;
1228
1229 if (sanity_check(info, tty->name, "compat_ioctl"))
1230 return -ENODEV;
1231 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1232
1233 switch (cmd) {
1234
1235 case MGSL_IOCSPARAMS32:
1236 rc = set_params32(info, compat_ptr(arg));
1237 break;
1238
1239 case MGSL_IOCGPARAMS32:
1240 rc = get_params32(info, compat_ptr(arg));
1241 break;
1242
1243 case MGSL_IOCGPARAMS:
1244 case MGSL_IOCSPARAMS:
1245 case MGSL_IOCGTXIDLE:
1246 case MGSL_IOCGSTATS:
1247 case MGSL_IOCWAITEVENT:
1248 case MGSL_IOCGIF:
1249 case MGSL_IOCSGPIO:
1250 case MGSL_IOCGGPIO:
1251 case MGSL_IOCWAITGPIO:
1252 case TIOCGICOUNT:
1253 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1254 break;
1255
1256 case MGSL_IOCSTXIDLE:
1257 case MGSL_IOCTXENABLE:
1258 case MGSL_IOCRXENABLE:
1259 case MGSL_IOCTXABORT:
1260 case TIOCMIWAIT:
1261 case MGSL_IOCSIF:
1262 rc = ioctl(tty, file, cmd, arg);
1263 break;
1264 }
1265
1266 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1267 return rc;
1268 }
1269 #else
1270 #define slgt_compat_ioctl NULL
1271 #endif /* ifdef CONFIG_COMPAT */
1272
1273 /*
1274 * proc fs support
1275 */
1276 static inline int line_info(char *buf, struct slgt_info *info)
1277 {
1278 char stat_buf[30];
1279 int ret;
1280 unsigned long flags;
1281
1282 ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1283 info->device_name, info->phys_reg_addr,
1284 info->irq_level, info->max_frame_size);
1285
1286 /* output current serial signal states */
1287 spin_lock_irqsave(&info->lock,flags);
1288 get_signals(info);
1289 spin_unlock_irqrestore(&info->lock,flags);
1290
1291 stat_buf[0] = 0;
1292 stat_buf[1] = 0;
1293 if (info->signals & SerialSignal_RTS)
1294 strcat(stat_buf, "|RTS");
1295 if (info->signals & SerialSignal_CTS)
1296 strcat(stat_buf, "|CTS");
1297 if (info->signals & SerialSignal_DTR)
1298 strcat(stat_buf, "|DTR");
1299 if (info->signals & SerialSignal_DSR)
1300 strcat(stat_buf, "|DSR");
1301 if (info->signals & SerialSignal_DCD)
1302 strcat(stat_buf, "|CD");
1303 if (info->signals & SerialSignal_RI)
1304 strcat(stat_buf, "|RI");
1305
1306 if (info->params.mode != MGSL_MODE_ASYNC) {
1307 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1308 info->icount.txok, info->icount.rxok);
1309 if (info->icount.txunder)
1310 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1311 if (info->icount.txabort)
1312 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1313 if (info->icount.rxshort)
1314 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1315 if (info->icount.rxlong)
1316 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1317 if (info->icount.rxover)
1318 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1319 if (info->icount.rxcrc)
1320 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1321 } else {
1322 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1323 info->icount.tx, info->icount.rx);
1324 if (info->icount.frame)
1325 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1326 if (info->icount.parity)
1327 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1328 if (info->icount.brk)
1329 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1330 if (info->icount.overrun)
1331 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1332 }
1333
1334 /* Append serial signal status to end */
1335 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1336
1337 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1338 info->tx_active,info->bh_requested,info->bh_running,
1339 info->pending_bh);
1340
1341 return ret;
1342 }
1343
1344 /* Called to print information about devices
1345 */
1346 static int read_proc(char *page, char **start, off_t off, int count,
1347 int *eof, void *data)
1348 {
1349 int len = 0, l;
1350 off_t begin = 0;
1351 struct slgt_info *info;
1352
1353 len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1354
1355 info = slgt_device_list;
1356 while( info ) {
1357 l = line_info(page + len, info);
1358 len += l;
1359 if (len+begin > off+count)
1360 goto done;
1361 if (len+begin < off) {
1362 begin += len;
1363 len = 0;
1364 }
1365 info = info->next_device;
1366 }
1367
1368 *eof = 1;
1369 done:
1370 if (off >= len+begin)
1371 return 0;
1372 *start = page + (off-begin);
1373 return ((count < begin+len-off) ? count : begin+len-off);
1374 }
1375
1376 /*
1377 * return count of bytes in transmit buffer
1378 */
1379 static int chars_in_buffer(struct tty_struct *tty)
1380 {
1381 struct slgt_info *info = tty->driver_data;
1382 if (sanity_check(info, tty->name, "chars_in_buffer"))
1383 return 0;
1384 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1385 return info->tx_count;
1386 }
1387
1388 /*
1389 * signal remote device to throttle send data (our receive data)
1390 */
1391 static void throttle(struct tty_struct * tty)
1392 {
1393 struct slgt_info *info = tty->driver_data;
1394 unsigned long flags;
1395
1396 if (sanity_check(info, tty->name, "throttle"))
1397 return;
1398 DBGINFO(("%s throttle\n", info->device_name));
1399 if (I_IXOFF(tty))
1400 send_xchar(tty, STOP_CHAR(tty));
1401 if (tty->termios->c_cflag & CRTSCTS) {
1402 spin_lock_irqsave(&info->lock,flags);
1403 info->signals &= ~SerialSignal_RTS;
1404 set_signals(info);
1405 spin_unlock_irqrestore(&info->lock,flags);
1406 }
1407 }
1408
1409 /*
1410 * signal remote device to stop throttling send data (our receive data)
1411 */
1412 static void unthrottle(struct tty_struct * tty)
1413 {
1414 struct slgt_info *info = tty->driver_data;
1415 unsigned long flags;
1416
1417 if (sanity_check(info, tty->name, "unthrottle"))
1418 return;
1419 DBGINFO(("%s unthrottle\n", info->device_name));
1420 if (I_IXOFF(tty)) {
1421 if (info->x_char)
1422 info->x_char = 0;
1423 else
1424 send_xchar(tty, START_CHAR(tty));
1425 }
1426 if (tty->termios->c_cflag & CRTSCTS) {
1427 spin_lock_irqsave(&info->lock,flags);
1428 info->signals |= SerialSignal_RTS;
1429 set_signals(info);
1430 spin_unlock_irqrestore(&info->lock,flags);
1431 }
1432 }
1433
1434 /*
1435 * set or clear transmit break condition
1436 * break_state -1=set break condition, 0=clear
1437 */
1438 static void set_break(struct tty_struct *tty, int break_state)
1439 {
1440 struct slgt_info *info = tty->driver_data;
1441 unsigned short value;
1442 unsigned long flags;
1443
1444 if (sanity_check(info, tty->name, "set_break"))
1445 return;
1446 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1447
1448 spin_lock_irqsave(&info->lock,flags);
1449 value = rd_reg16(info, TCR);
1450 if (break_state == -1)
1451 value |= BIT6;
1452 else
1453 value &= ~BIT6;
1454 wr_reg16(info, TCR, value);
1455 spin_unlock_irqrestore(&info->lock,flags);
1456 }
1457
1458 #if SYNCLINK_GENERIC_HDLC
1459
1460 /**
1461 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1462 * set encoding and frame check sequence (FCS) options
1463 *
1464 * dev pointer to network device structure
1465 * encoding serial encoding setting
1466 * parity FCS setting
1467 *
1468 * returns 0 if success, otherwise error code
1469 */
1470 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1471 unsigned short parity)
1472 {
1473 struct slgt_info *info = dev_to_port(dev);
1474 unsigned char new_encoding;
1475 unsigned short new_crctype;
1476
1477 /* return error if TTY interface open */
1478 if (info->count)
1479 return -EBUSY;
1480
1481 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1482
1483 switch (encoding)
1484 {
1485 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1486 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1487 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1488 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1489 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1490 default: return -EINVAL;
1491 }
1492
1493 switch (parity)
1494 {
1495 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1496 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1497 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1498 default: return -EINVAL;
1499 }
1500
1501 info->params.encoding = new_encoding;
1502 info->params.crc_type = new_crctype;
1503
1504 /* if network interface up, reprogram hardware */
1505 if (info->netcount)
1506 program_hw(info);
1507
1508 return 0;
1509 }
1510
1511 /**
1512 * called by generic HDLC layer to send frame
1513 *
1514 * skb socket buffer containing HDLC frame
1515 * dev pointer to network device structure
1516 *
1517 * returns 0 if success, otherwise error code
1518 */
1519 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1520 {
1521 struct slgt_info *info = dev_to_port(dev);
1522 struct net_device_stats *stats = hdlc_stats(dev);
1523 unsigned long flags;
1524
1525 DBGINFO(("%s hdlc_xmit\n", dev->name));
1526
1527 /* stop sending until this frame completes */
1528 netif_stop_queue(dev);
1529
1530 /* copy data to device buffers */
1531 info->tx_count = skb->len;
1532 tx_load(info, skb->data, skb->len);
1533
1534 /* update network statistics */
1535 stats->tx_packets++;
1536 stats->tx_bytes += skb->len;
1537
1538 /* done with socket buffer, so free it */
1539 dev_kfree_skb(skb);
1540
1541 /* save start time for transmit timeout detection */
1542 dev->trans_start = jiffies;
1543
1544 /* start hardware transmitter if necessary */
1545 spin_lock_irqsave(&info->lock,flags);
1546 if (!info->tx_active)
1547 tx_start(info);
1548 spin_unlock_irqrestore(&info->lock,flags);
1549
1550 return 0;
1551 }
1552
1553 /**
1554 * called by network layer when interface enabled
1555 * claim resources and initialize hardware
1556 *
1557 * dev pointer to network device structure
1558 *
1559 * returns 0 if success, otherwise error code
1560 */
1561 static int hdlcdev_open(struct net_device *dev)
1562 {
1563 struct slgt_info *info = dev_to_port(dev);
1564 int rc;
1565 unsigned long flags;
1566
1567 if (!try_module_get(THIS_MODULE))
1568 return -EBUSY;
1569
1570 DBGINFO(("%s hdlcdev_open\n", dev->name));
1571
1572 /* generic HDLC layer open processing */
1573 if ((rc = hdlc_open(dev)))
1574 return rc;
1575
1576 /* arbitrate between network and tty opens */
1577 spin_lock_irqsave(&info->netlock, flags);
1578 if (info->count != 0 || info->netcount != 0) {
1579 DBGINFO(("%s hdlc_open busy\n", dev->name));
1580 spin_unlock_irqrestore(&info->netlock, flags);
1581 return -EBUSY;
1582 }
1583 info->netcount=1;
1584 spin_unlock_irqrestore(&info->netlock, flags);
1585
1586 /* claim resources and init adapter */
1587 if ((rc = startup(info)) != 0) {
1588 spin_lock_irqsave(&info->netlock, flags);
1589 info->netcount=0;
1590 spin_unlock_irqrestore(&info->netlock, flags);
1591 return rc;
1592 }
1593
1594 /* assert DTR and RTS, apply hardware settings */
1595 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1596 program_hw(info);
1597
1598 /* enable network layer transmit */
1599 dev->trans_start = jiffies;
1600 netif_start_queue(dev);
1601
1602 /* inform generic HDLC layer of current DCD status */
1603 spin_lock_irqsave(&info->lock, flags);
1604 get_signals(info);
1605 spin_unlock_irqrestore(&info->lock, flags);
1606 if (info->signals & SerialSignal_DCD)
1607 netif_carrier_on(dev);
1608 else
1609 netif_carrier_off(dev);
1610 return 0;
1611 }
1612
1613 /**
1614 * called by network layer when interface is disabled
1615 * shutdown hardware and release resources
1616 *
1617 * dev pointer to network device structure
1618 *
1619 * returns 0 if success, otherwise error code
1620 */
1621 static int hdlcdev_close(struct net_device *dev)
1622 {
1623 struct slgt_info *info = dev_to_port(dev);
1624 unsigned long flags;
1625
1626 DBGINFO(("%s hdlcdev_close\n", dev->name));
1627
1628 netif_stop_queue(dev);
1629
1630 /* shutdown adapter and release resources */
1631 shutdown(info);
1632
1633 hdlc_close(dev);
1634
1635 spin_lock_irqsave(&info->netlock, flags);
1636 info->netcount=0;
1637 spin_unlock_irqrestore(&info->netlock, flags);
1638
1639 module_put(THIS_MODULE);
1640 return 0;
1641 }
1642
1643 /**
1644 * called by network layer to process IOCTL call to network device
1645 *
1646 * dev pointer to network device structure
1647 * ifr pointer to network interface request structure
1648 * cmd IOCTL command code
1649 *
1650 * returns 0 if success, otherwise error code
1651 */
1652 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1653 {
1654 const size_t size = sizeof(sync_serial_settings);
1655 sync_serial_settings new_line;
1656 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1657 struct slgt_info *info = dev_to_port(dev);
1658 unsigned int flags;
1659
1660 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1661
1662 /* return error if TTY interface open */
1663 if (info->count)
1664 return -EBUSY;
1665
1666 if (cmd != SIOCWANDEV)
1667 return hdlc_ioctl(dev, ifr, cmd);
1668
1669 switch(ifr->ifr_settings.type) {
1670 case IF_GET_IFACE: /* return current sync_serial_settings */
1671
1672 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1673 if (ifr->ifr_settings.size < size) {
1674 ifr->ifr_settings.size = size; /* data size wanted */
1675 return -ENOBUFS;
1676 }
1677
1678 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1679 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1680 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1681 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1682
1683 switch (flags){
1684 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1685 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1686 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1687 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1688 default: new_line.clock_type = CLOCK_DEFAULT;
1689 }
1690
1691 new_line.clock_rate = info->params.clock_speed;
1692 new_line.loopback = info->params.loopback ? 1:0;
1693
1694 if (copy_to_user(line, &new_line, size))
1695 return -EFAULT;
1696 return 0;
1697
1698 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1699
1700 if(!capable(CAP_NET_ADMIN))
1701 return -EPERM;
1702 if (copy_from_user(&new_line, line, size))
1703 return -EFAULT;
1704
1705 switch (new_line.clock_type)
1706 {
1707 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1708 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1709 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1710 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1711 case CLOCK_DEFAULT: flags = info->params.flags &
1712 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1713 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1714 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1715 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1716 default: return -EINVAL;
1717 }
1718
1719 if (new_line.loopback != 0 && new_line.loopback != 1)
1720 return -EINVAL;
1721
1722 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1723 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1724 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1725 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1726 info->params.flags |= flags;
1727
1728 info->params.loopback = new_line.loopback;
1729
1730 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1731 info->params.clock_speed = new_line.clock_rate;
1732 else
1733 info->params.clock_speed = 0;
1734
1735 /* if network interface up, reprogram hardware */
1736 if (info->netcount)
1737 program_hw(info);
1738 return 0;
1739
1740 default:
1741 return hdlc_ioctl(dev, ifr, cmd);
1742 }
1743 }
1744
1745 /**
1746 * called by network layer when transmit timeout is detected
1747 *
1748 * dev pointer to network device structure
1749 */
1750 static void hdlcdev_tx_timeout(struct net_device *dev)
1751 {
1752 struct slgt_info *info = dev_to_port(dev);
1753 struct net_device_stats *stats = hdlc_stats(dev);
1754 unsigned long flags;
1755
1756 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1757
1758 stats->tx_errors++;
1759 stats->tx_aborted_errors++;
1760
1761 spin_lock_irqsave(&info->lock,flags);
1762 tx_stop(info);
1763 spin_unlock_irqrestore(&info->lock,flags);
1764
1765 netif_wake_queue(dev);
1766 }
1767
1768 /**
1769 * called by device driver when transmit completes
1770 * reenable network layer transmit if stopped
1771 *
1772 * info pointer to device instance information
1773 */
1774 static void hdlcdev_tx_done(struct slgt_info *info)
1775 {
1776 if (netif_queue_stopped(info->netdev))
1777 netif_wake_queue(info->netdev);
1778 }
1779
1780 /**
1781 * called by device driver when frame received
1782 * pass frame to network layer
1783 *
1784 * info pointer to device instance information
1785 * buf pointer to buffer contianing frame data
1786 * size count of data bytes in buf
1787 */
1788 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1789 {
1790 struct sk_buff *skb = dev_alloc_skb(size);
1791 struct net_device *dev = info->netdev;
1792 struct net_device_stats *stats = hdlc_stats(dev);
1793
1794 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1795
1796 if (skb == NULL) {
1797 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1798 stats->rx_dropped++;
1799 return;
1800 }
1801
1802 memcpy(skb_put(skb, size),buf,size);
1803
1804 skb->protocol = hdlc_type_trans(skb, info->netdev);
1805
1806 stats->rx_packets++;
1807 stats->rx_bytes += size;
1808
1809 netif_rx(skb);
1810
1811 info->netdev->last_rx = jiffies;
1812 }
1813
1814 /**
1815 * called by device driver when adding device instance
1816 * do generic HDLC initialization
1817 *
1818 * info pointer to device instance information
1819 *
1820 * returns 0 if success, otherwise error code
1821 */
1822 static int hdlcdev_init(struct slgt_info *info)
1823 {
1824 int rc;
1825 struct net_device *dev;
1826 hdlc_device *hdlc;
1827
1828 /* allocate and initialize network and HDLC layer objects */
1829
1830 if (!(dev = alloc_hdlcdev(info))) {
1831 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1832 return -ENOMEM;
1833 }
1834
1835 /* for network layer reporting purposes only */
1836 dev->mem_start = info->phys_reg_addr;
1837 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1838 dev->irq = info->irq_level;
1839
1840 /* network layer callbacks and settings */
1841 dev->do_ioctl = hdlcdev_ioctl;
1842 dev->open = hdlcdev_open;
1843 dev->stop = hdlcdev_close;
1844 dev->tx_timeout = hdlcdev_tx_timeout;
1845 dev->watchdog_timeo = 10*HZ;
1846 dev->tx_queue_len = 50;
1847
1848 /* generic HDLC layer callbacks and settings */
1849 hdlc = dev_to_hdlc(dev);
1850 hdlc->attach = hdlcdev_attach;
1851 hdlc->xmit = hdlcdev_xmit;
1852
1853 /* register objects with HDLC layer */
1854 if ((rc = register_hdlc_device(dev))) {
1855 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1856 free_netdev(dev);
1857 return rc;
1858 }
1859
1860 info->netdev = dev;
1861 return 0;
1862 }
1863
1864 /**
1865 * called by device driver when removing device instance
1866 * do generic HDLC cleanup
1867 *
1868 * info pointer to device instance information
1869 */
1870 static void hdlcdev_exit(struct slgt_info *info)
1871 {
1872 unregister_hdlc_device(info->netdev);
1873 free_netdev(info->netdev);
1874 info->netdev = NULL;
1875 }
1876
1877 #endif /* ifdef CONFIG_HDLC */
1878
1879 /*
1880 * get async data from rx DMA buffers
1881 */
1882 static void rx_async(struct slgt_info *info)
1883 {
1884 struct tty_struct *tty = info->tty;
1885 struct mgsl_icount *icount = &info->icount;
1886 unsigned int start, end;
1887 unsigned char *p;
1888 unsigned char status;
1889 struct slgt_desc *bufs = info->rbufs;
1890 int i, count;
1891 int chars = 0;
1892 int stat;
1893 unsigned char ch;
1894
1895 start = end = info->rbuf_current;
1896
1897 while(desc_complete(bufs[end])) {
1898 count = desc_count(bufs[end]) - info->rbuf_index;
1899 p = bufs[end].buf + info->rbuf_index;
1900
1901 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1902 DBGDATA(info, p, count, "rx");
1903
1904 for(i=0 ; i < count; i+=2, p+=2) {
1905 ch = *p;
1906 icount->rx++;
1907
1908 stat = 0;
1909
1910 if ((status = *(p+1) & (BIT1 + BIT0))) {
1911 if (status & BIT1)
1912 icount->parity++;
1913 else if (status & BIT0)
1914 icount->frame++;
1915 /* discard char if tty control flags say so */
1916 if (status & info->ignore_status_mask)
1917 continue;
1918 if (status & BIT1)
1919 stat = TTY_PARITY;
1920 else if (status & BIT0)
1921 stat = TTY_FRAME;
1922 }
1923 if (tty) {
1924 tty_insert_flip_char(tty, ch, stat);
1925 chars++;
1926 }
1927 }
1928
1929 if (i < count) {
1930 /* receive buffer not completed */
1931 info->rbuf_index += i;
1932 mod_timer(&info->rx_timer, jiffies + 1);
1933 break;
1934 }
1935
1936 info->rbuf_index = 0;
1937 free_rbufs(info, end, end);
1938
1939 if (++end == info->rbuf_count)
1940 end = 0;
1941
1942 /* if entire list searched then no frame available */
1943 if (end == start)
1944 break;
1945 }
1946
1947 if (tty && chars)
1948 tty_flip_buffer_push(tty);
1949 }
1950
1951 /*
1952 * return next bottom half action to perform
1953 */
1954 static int bh_action(struct slgt_info *info)
1955 {
1956 unsigned long flags;
1957 int rc;
1958
1959 spin_lock_irqsave(&info->lock,flags);
1960
1961 if (info->pending_bh & BH_RECEIVE) {
1962 info->pending_bh &= ~BH_RECEIVE;
1963 rc = BH_RECEIVE;
1964 } else if (info->pending_bh & BH_TRANSMIT) {
1965 info->pending_bh &= ~BH_TRANSMIT;
1966 rc = BH_TRANSMIT;
1967 } else if (info->pending_bh & BH_STATUS) {
1968 info->pending_bh &= ~BH_STATUS;
1969 rc = BH_STATUS;
1970 } else {
1971 /* Mark BH routine as complete */
1972 info->bh_running = 0;
1973 info->bh_requested = 0;
1974 rc = 0;
1975 }
1976
1977 spin_unlock_irqrestore(&info->lock,flags);
1978
1979 return rc;
1980 }
1981
1982 /*
1983 * perform bottom half processing
1984 */
1985 static void bh_handler(struct work_struct *work)
1986 {
1987 struct slgt_info *info = container_of(work, struct slgt_info, task);
1988 int action;
1989
1990 if (!info)
1991 return;
1992 info->bh_running = 1;
1993
1994 while((action = bh_action(info))) {
1995 switch (action) {
1996 case BH_RECEIVE:
1997 DBGBH(("%s bh receive\n", info->device_name));
1998 switch(info->params.mode) {
1999 case MGSL_MODE_ASYNC:
2000 rx_async(info);
2001 break;
2002 case MGSL_MODE_HDLC:
2003 while(rx_get_frame(info));
2004 break;
2005 case MGSL_MODE_RAW:
2006 case MGSL_MODE_MONOSYNC:
2007 case MGSL_MODE_BISYNC:
2008 while(rx_get_buf(info));
2009 break;
2010 }
2011 /* restart receiver if rx DMA buffers exhausted */
2012 if (info->rx_restart)
2013 rx_start(info);
2014 break;
2015 case BH_TRANSMIT:
2016 bh_transmit(info);
2017 break;
2018 case BH_STATUS:
2019 DBGBH(("%s bh status\n", info->device_name));
2020 info->ri_chkcount = 0;
2021 info->dsr_chkcount = 0;
2022 info->dcd_chkcount = 0;
2023 info->cts_chkcount = 0;
2024 break;
2025 default:
2026 DBGBH(("%s unknown action\n", info->device_name));
2027 break;
2028 }
2029 }
2030 DBGBH(("%s bh_handler exit\n", info->device_name));
2031 }
2032
2033 static void bh_transmit(struct slgt_info *info)
2034 {
2035 struct tty_struct *tty = info->tty;
2036
2037 DBGBH(("%s bh_transmit\n", info->device_name));
2038 if (tty)
2039 tty_wakeup(tty);
2040 }
2041
2042 static void dsr_change(struct slgt_info *info, unsigned short status)
2043 {
2044 if (status & BIT3) {
2045 info->signals |= SerialSignal_DSR;
2046 info->input_signal_events.dsr_up++;
2047 } else {
2048 info->signals &= ~SerialSignal_DSR;
2049 info->input_signal_events.dsr_down++;
2050 }
2051 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2052 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2053 slgt_irq_off(info, IRQ_DSR);
2054 return;
2055 }
2056 info->icount.dsr++;
2057 wake_up_interruptible(&info->status_event_wait_q);
2058 wake_up_interruptible(&info->event_wait_q);
2059 info->pending_bh |= BH_STATUS;
2060 }
2061
2062 static void cts_change(struct slgt_info *info, unsigned short status)
2063 {
2064 if (status & BIT2) {
2065 info->signals |= SerialSignal_CTS;
2066 info->input_signal_events.cts_up++;
2067 } else {
2068 info->signals &= ~SerialSignal_CTS;
2069 info->input_signal_events.cts_down++;
2070 }
2071 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2072 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2073 slgt_irq_off(info, IRQ_CTS);
2074 return;
2075 }
2076 info->icount.cts++;
2077 wake_up_interruptible(&info->status_event_wait_q);
2078 wake_up_interruptible(&info->event_wait_q);
2079 info->pending_bh |= BH_STATUS;
2080
2081 if (info->flags & ASYNC_CTS_FLOW) {
2082 if (info->tty) {
2083 if (info->tty->hw_stopped) {
2084 if (info->signals & SerialSignal_CTS) {
2085 info->tty->hw_stopped = 0;
2086 info->pending_bh |= BH_TRANSMIT;
2087 return;
2088 }
2089 } else {
2090 if (!(info->signals & SerialSignal_CTS))
2091 info->tty->hw_stopped = 1;
2092 }
2093 }
2094 }
2095 }
2096
2097 static void dcd_change(struct slgt_info *info, unsigned short status)
2098 {
2099 if (status & BIT1) {
2100 info->signals |= SerialSignal_DCD;
2101 info->input_signal_events.dcd_up++;
2102 } else {
2103 info->signals &= ~SerialSignal_DCD;
2104 info->input_signal_events.dcd_down++;
2105 }
2106 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2107 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2108 slgt_irq_off(info, IRQ_DCD);
2109 return;
2110 }
2111 info->icount.dcd++;
2112 #if SYNCLINK_GENERIC_HDLC
2113 if (info->netcount) {
2114 if (info->signals & SerialSignal_DCD)
2115 netif_carrier_on(info->netdev);
2116 else
2117 netif_carrier_off(info->netdev);
2118 }
2119 #endif
2120 wake_up_interruptible(&info->status_event_wait_q);
2121 wake_up_interruptible(&info->event_wait_q);
2122 info->pending_bh |= BH_STATUS;
2123
2124 if (info->flags & ASYNC_CHECK_CD) {
2125 if (info->signals & SerialSignal_DCD)
2126 wake_up_interruptible(&info->open_wait);
2127 else {
2128 if (info->tty)
2129 tty_hangup(info->tty);
2130 }
2131 }
2132 }
2133
2134 static void ri_change(struct slgt_info *info, unsigned short status)
2135 {
2136 if (status & BIT0) {
2137 info->signals |= SerialSignal_RI;
2138 info->input_signal_events.ri_up++;
2139 } else {
2140 info->signals &= ~SerialSignal_RI;
2141 info->input_signal_events.ri_down++;
2142 }
2143 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2144 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2145 slgt_irq_off(info, IRQ_RI);
2146 return;
2147 }
2148 info->icount.rng++;
2149 wake_up_interruptible(&info->status_event_wait_q);
2150 wake_up_interruptible(&info->event_wait_q);
2151 info->pending_bh |= BH_STATUS;
2152 }
2153
2154 static void isr_serial(struct slgt_info *info)
2155 {
2156 unsigned short status = rd_reg16(info, SSR);
2157
2158 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2159
2160 wr_reg16(info, SSR, status); /* clear pending */
2161
2162 info->irq_occurred = 1;
2163
2164 if (info->params.mode == MGSL_MODE_ASYNC) {
2165 if (status & IRQ_TXIDLE) {
2166 if (info->tx_count)
2167 isr_txeom(info, status);
2168 }
2169 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2170 info->icount.brk++;
2171 /* process break detection if tty control allows */
2172 if (info->tty) {
2173 if (!(status & info->ignore_status_mask)) {
2174 if (info->read_status_mask & MASK_BREAK) {
2175 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
2176 if (info->flags & ASYNC_SAK)
2177 do_SAK(info->tty);
2178 }
2179 }
2180 }
2181 }
2182 } else {
2183 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2184 isr_txeom(info, status);
2185
2186 if (status & IRQ_RXIDLE) {
2187 if (status & RXIDLE)
2188 info->icount.rxidle++;
2189 else
2190 info->icount.exithunt++;
2191 wake_up_interruptible(&info->event_wait_q);
2192 }
2193
2194 if (status & IRQ_RXOVER)
2195 rx_start(info);
2196 }
2197
2198 if (status & IRQ_DSR)
2199 dsr_change(info, status);
2200 if (status & IRQ_CTS)
2201 cts_change(info, status);
2202 if (status & IRQ_DCD)
2203 dcd_change(info, status);
2204 if (status & IRQ_RI)
2205 ri_change(info, status);
2206 }
2207
2208 static void isr_rdma(struct slgt_info *info)
2209 {
2210 unsigned int status = rd_reg32(info, RDCSR);
2211
2212 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2213
2214 /* RDCSR (rx DMA control/status)
2215 *
2216 * 31..07 reserved
2217 * 06 save status byte to DMA buffer
2218 * 05 error
2219 * 04 eol (end of list)
2220 * 03 eob (end of buffer)
2221 * 02 IRQ enable
2222 * 01 reset
2223 * 00 enable
2224 */
2225 wr_reg32(info, RDCSR, status); /* clear pending */
2226
2227 if (status & (BIT5 + BIT4)) {
2228 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2229 info->rx_restart = 1;
2230 }
2231 info->pending_bh |= BH_RECEIVE;
2232 }
2233
2234 static void isr_tdma(struct slgt_info *info)
2235 {
2236 unsigned int status = rd_reg32(info, TDCSR);
2237
2238 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2239
2240 /* TDCSR (tx DMA control/status)
2241 *
2242 * 31..06 reserved
2243 * 05 error
2244 * 04 eol (end of list)
2245 * 03 eob (end of buffer)
2246 * 02 IRQ enable
2247 * 01 reset
2248 * 00 enable
2249 */
2250 wr_reg32(info, TDCSR, status); /* clear pending */
2251
2252 if (status & (BIT5 + BIT4 + BIT3)) {
2253 // another transmit buffer has completed
2254 // run bottom half to get more send data from user
2255 info->pending_bh |= BH_TRANSMIT;
2256 }
2257 }
2258
2259 static void isr_txeom(struct slgt_info *info, unsigned short status)
2260 {
2261 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2262
2263 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2264 tdma_reset(info);
2265 reset_tbufs(info);
2266 if (status & IRQ_TXUNDER) {
2267 unsigned short val = rd_reg16(info, TCR);
2268 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2269 wr_reg16(info, TCR, val); /* clear reset bit */
2270 }
2271
2272 if (info->tx_active) {
2273 if (info->params.mode != MGSL_MODE_ASYNC) {
2274 if (status & IRQ_TXUNDER)
2275 info->icount.txunder++;
2276 else if (status & IRQ_TXIDLE)
2277 info->icount.txok++;
2278 }
2279
2280 info->tx_active = 0;
2281 info->tx_count = 0;
2282
2283 del_timer(&info->tx_timer);
2284
2285 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2286 info->signals &= ~SerialSignal_RTS;
2287 info->drop_rts_on_tx_done = 0;
2288 set_signals(info);
2289 }
2290
2291 #if SYNCLINK_GENERIC_HDLC
2292 if (info->netcount)
2293 hdlcdev_tx_done(info);
2294 else
2295 #endif
2296 {
2297 if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2298 tx_stop(info);
2299 return;
2300 }
2301 info->pending_bh |= BH_TRANSMIT;
2302 }
2303 }
2304 }
2305
2306 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2307 {
2308 struct cond_wait *w, *prev;
2309
2310 /* wake processes waiting for specific transitions */
2311 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2312 if (w->data & changed) {
2313 w->data = state;
2314 wake_up_interruptible(&w->q);
2315 if (prev != NULL)
2316 prev->next = w->next;
2317 else
2318 info->gpio_wait_q = w->next;
2319 } else
2320 prev = w;
2321 }
2322 }
2323
2324 /* interrupt service routine
2325 *
2326 * irq interrupt number
2327 * dev_id device ID supplied during interrupt registration
2328 */
2329 static irqreturn_t slgt_interrupt(int irq, void *dev_id)
2330 {
2331 struct slgt_info *info;
2332 unsigned int gsr;
2333 unsigned int i;
2334
2335 DBGISR(("slgt_interrupt irq=%d entry\n", irq));
2336
2337 info = dev_id;
2338 if (!info)
2339 return IRQ_NONE;
2340
2341 spin_lock(&info->lock);
2342
2343 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2344 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2345 info->irq_occurred = 1;
2346 for(i=0; i < info->port_count ; i++) {
2347 if (info->port_array[i] == NULL)
2348 continue;
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 }
2356 }
2357
2358 if (info->gpio_present) {
2359 unsigned int state;
2360 unsigned int changed;
2361 while ((changed = rd_reg32(info, IOSR)) != 0) {
2362 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2363 /* read latched state of GPIO signals */
2364 state = rd_reg32(info, IOVR);
2365 /* clear pending GPIO interrupt bits */
2366 wr_reg32(info, IOSR, changed);
2367 for (i=0 ; i < info->port_count ; i++) {
2368 if (info->port_array[i] != NULL)
2369 isr_gpio(info->port_array[i], changed, state);
2370 }
2371 }
2372 }
2373
2374 for(i=0; i < info->port_count ; i++) {
2375 struct slgt_info *port = info->port_array[i];
2376
2377 if (port && (port->count || port->netcount) &&
2378 port->pending_bh && !port->bh_running &&
2379 !port->bh_requested) {
2380 DBGISR(("%s bh queued\n", port->device_name));
2381 schedule_work(&port->task);
2382 port->bh_requested = 1;
2383 }
2384 }
2385
2386 spin_unlock(&info->lock);
2387
2388 DBGISR(("slgt_interrupt irq=%d exit\n", irq));
2389 return IRQ_HANDLED;
2390 }
2391
2392 static int startup(struct slgt_info *info)
2393 {
2394 DBGINFO(("%s startup\n", info->device_name));
2395
2396 if (info->flags & ASYNC_INITIALIZED)
2397 return 0;
2398
2399 if (!info->tx_buf) {
2400 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2401 if (!info->tx_buf) {
2402 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2403 return -ENOMEM;
2404 }
2405 }
2406
2407 info->pending_bh = 0;
2408
2409 memset(&info->icount, 0, sizeof(info->icount));
2410
2411 /* program hardware for current parameters */
2412 change_params(info);
2413
2414 if (info->tty)
2415 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2416
2417 info->flags |= ASYNC_INITIALIZED;
2418
2419 return 0;
2420 }
2421
2422 /*
2423 * called by close() and hangup() to shutdown hardware
2424 */
2425 static void shutdown(struct slgt_info *info)
2426 {
2427 unsigned long flags;
2428
2429 if (!(info->flags & ASYNC_INITIALIZED))
2430 return;
2431
2432 DBGINFO(("%s shutdown\n", info->device_name));
2433
2434 /* clear status wait queue because status changes */
2435 /* can't happen after shutting down the hardware */
2436 wake_up_interruptible(&info->status_event_wait_q);
2437 wake_up_interruptible(&info->event_wait_q);
2438
2439 del_timer_sync(&info->tx_timer);
2440 del_timer_sync(&info->rx_timer);
2441
2442 kfree(info->tx_buf);
2443 info->tx_buf = NULL;
2444
2445 spin_lock_irqsave(&info->lock,flags);
2446
2447 tx_stop(info);
2448 rx_stop(info);
2449
2450 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2451
2452 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2453 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2454 set_signals(info);
2455 }
2456
2457 flush_cond_wait(&info->gpio_wait_q);
2458
2459 spin_unlock_irqrestore(&info->lock,flags);
2460
2461 if (info->tty)
2462 set_bit(TTY_IO_ERROR, &info->tty->flags);
2463
2464 info->flags &= ~ASYNC_INITIALIZED;
2465 }
2466
2467 static void program_hw(struct slgt_info *info)
2468 {
2469 unsigned long flags;
2470
2471 spin_lock_irqsave(&info->lock,flags);
2472
2473 rx_stop(info);
2474 tx_stop(info);
2475
2476 if (info->params.mode != MGSL_MODE_ASYNC ||
2477 info->netcount)
2478 sync_mode(info);
2479 else
2480 async_mode(info);
2481
2482 set_signals(info);
2483
2484 info->dcd_chkcount = 0;
2485 info->cts_chkcount = 0;
2486 info->ri_chkcount = 0;
2487 info->dsr_chkcount = 0;
2488
2489 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2490 get_signals(info);
2491
2492 if (info->netcount ||
2493 (info->tty && info->tty->termios->c_cflag & CREAD))
2494 rx_start(info);
2495
2496 spin_unlock_irqrestore(&info->lock,flags);
2497 }
2498
2499 /*
2500 * reconfigure adapter based on new parameters
2501 */
2502 static void change_params(struct slgt_info *info)
2503 {
2504 unsigned cflag;
2505 int bits_per_char;
2506
2507 if (!info->tty || !info->tty->termios)
2508 return;
2509 DBGINFO(("%s change_params\n", info->device_name));
2510
2511 cflag = info->tty->termios->c_cflag;
2512
2513 /* if B0 rate (hangup) specified then negate DTR and RTS */
2514 /* otherwise assert DTR and RTS */
2515 if (cflag & CBAUD)
2516 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2517 else
2518 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2519
2520 /* byte size and parity */
2521
2522 switch (cflag & CSIZE) {
2523 case CS5: info->params.data_bits = 5; break;
2524 case CS6: info->params.data_bits = 6; break;
2525 case CS7: info->params.data_bits = 7; break;
2526 case CS8: info->params.data_bits = 8; break;
2527 default: info->params.data_bits = 7; break;
2528 }
2529
2530 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2531
2532 if (cflag & PARENB)
2533 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2534 else
2535 info->params.parity = ASYNC_PARITY_NONE;
2536
2537 /* calculate number of jiffies to transmit a full
2538 * FIFO (32 bytes) at specified data rate
2539 */
2540 bits_per_char = info->params.data_bits +
2541 info->params.stop_bits + 1;
2542
2543 info->params.data_rate = tty_get_baud_rate(info->tty);
2544
2545 if (info->params.data_rate) {
2546 info->timeout = (32*HZ*bits_per_char) /
2547 info->params.data_rate;
2548 }
2549 info->timeout += HZ/50; /* Add .02 seconds of slop */
2550
2551 if (cflag & CRTSCTS)
2552 info->flags |= ASYNC_CTS_FLOW;
2553 else
2554 info->flags &= ~ASYNC_CTS_FLOW;
2555
2556 if (cflag & CLOCAL)
2557 info->flags &= ~ASYNC_CHECK_CD;
2558 else
2559 info->flags |= ASYNC_CHECK_CD;
2560
2561 /* process tty input control flags */
2562
2563 info->read_status_mask = IRQ_RXOVER;
2564 if (I_INPCK(info->tty))
2565 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2566 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2567 info->read_status_mask |= MASK_BREAK;
2568 if (I_IGNPAR(info->tty))
2569 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2570 if (I_IGNBRK(info->tty)) {
2571 info->ignore_status_mask |= MASK_BREAK;
2572 /* If ignoring parity and break indicators, ignore
2573 * overruns too. (For real raw support).
2574 */
2575 if (I_IGNPAR(info->tty))
2576 info->ignore_status_mask |= MASK_OVERRUN;
2577 }
2578
2579 program_hw(info);
2580 }
2581
2582 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2583 {
2584 DBGINFO(("%s get_stats\n", info->device_name));
2585 if (!user_icount) {
2586 memset(&info->icount, 0, sizeof(info->icount));
2587 } else {
2588 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2589 return -EFAULT;
2590 }
2591 return 0;
2592 }
2593
2594 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2595 {
2596 DBGINFO(("%s get_params\n", info->device_name));
2597 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2598 return -EFAULT;
2599 return 0;
2600 }
2601
2602 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2603 {
2604 unsigned long flags;
2605 MGSL_PARAMS tmp_params;
2606
2607 DBGINFO(("%s set_params\n", info->device_name));
2608 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2609 return -EFAULT;
2610
2611 spin_lock_irqsave(&info->lock, flags);
2612 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2613 spin_unlock_irqrestore(&info->lock, flags);
2614
2615 change_params(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 DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2673 spin_lock_irqsave(&info->lock,flags);
2674 if (enable) {
2675 if (!info->rx_enabled)
2676 rx_start(info);
2677 else if (enable == 2) {
2678 /* force hunt mode (write 1 to RCR[3]) */
2679 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2680 }
2681 } else {
2682 if (info->rx_enabled)
2683 rx_stop(info);
2684 }
2685 spin_unlock_irqrestore(&info->lock,flags);
2686 return 0;
2687 }
2688
2689 /*
2690 * wait for specified event to occur
2691 */
2692 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2693 {
2694 unsigned long flags;
2695 int s;
2696 int rc=0;
2697 struct mgsl_icount cprev, cnow;
2698 int events;
2699 int mask;
2700 struct _input_signal_events oldsigs, newsigs;
2701 DECLARE_WAITQUEUE(wait, current);
2702
2703 if (get_user(mask, mask_ptr))
2704 return -EFAULT;
2705
2706 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2707
2708 spin_lock_irqsave(&info->lock,flags);
2709
2710 /* return immediately if state matches requested events */
2711 get_signals(info);
2712 s = info->signals;
2713
2714 events = mask &
2715 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2716 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2717 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2718 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2719 if (events) {
2720 spin_unlock_irqrestore(&info->lock,flags);
2721 goto exit;
2722 }
2723
2724 /* save current irq counts */
2725 cprev = info->icount;
2726 oldsigs = info->input_signal_events;
2727
2728 /* enable hunt and idle irqs if needed */
2729 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2730 unsigned short val = rd_reg16(info, SCR);
2731 if (!(val & IRQ_RXIDLE))
2732 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2733 }
2734
2735 set_current_state(TASK_INTERRUPTIBLE);
2736 add_wait_queue(&info->event_wait_q, &wait);
2737
2738 spin_unlock_irqrestore(&info->lock,flags);
2739
2740 for(;;) {
2741 schedule();
2742 if (signal_pending(current)) {
2743 rc = -ERESTARTSYS;
2744 break;
2745 }
2746
2747 /* get current irq counts */
2748 spin_lock_irqsave(&info->lock,flags);
2749 cnow = info->icount;
2750 newsigs = info->input_signal_events;
2751 set_current_state(TASK_INTERRUPTIBLE);
2752 spin_unlock_irqrestore(&info->lock,flags);
2753
2754 /* if no change, wait aborted for some reason */
2755 if (newsigs.dsr_up == oldsigs.dsr_up &&
2756 newsigs.dsr_down == oldsigs.dsr_down &&
2757 newsigs.dcd_up == oldsigs.dcd_up &&
2758 newsigs.dcd_down == oldsigs.dcd_down &&
2759 newsigs.cts_up == oldsigs.cts_up &&
2760 newsigs.cts_down == oldsigs.cts_down &&
2761 newsigs.ri_up == oldsigs.ri_up &&
2762 newsigs.ri_down == oldsigs.ri_down &&
2763 cnow.exithunt == cprev.exithunt &&
2764 cnow.rxidle == cprev.rxidle) {
2765 rc = -EIO;
2766 break;
2767 }
2768
2769 events = mask &
2770 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2771 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2772 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2773 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2774 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2775 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2776 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2777 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2778 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2779 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2780 if (events)
2781 break;
2782
2783 cprev = cnow;
2784 oldsigs = newsigs;
2785 }
2786
2787 remove_wait_queue(&info->event_wait_q, &wait);
2788 set_current_state(TASK_RUNNING);
2789
2790
2791 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2792 spin_lock_irqsave(&info->lock,flags);
2793 if (!waitqueue_active(&info->event_wait_q)) {
2794 /* disable enable exit hunt mode/idle rcvd IRQs */
2795 wr_reg16(info, SCR,
2796 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2797 }
2798 spin_unlock_irqrestore(&info->lock,flags);
2799 }
2800 exit:
2801 if (rc == 0)
2802 rc = put_user(events, mask_ptr);
2803 return rc;
2804 }
2805
2806 static int get_interface(struct slgt_info *info, int __user *if_mode)
2807 {
2808 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2809 if (put_user(info->if_mode, if_mode))
2810 return -EFAULT;
2811 return 0;
2812 }
2813
2814 static int set_interface(struct slgt_info *info, int if_mode)
2815 {
2816 unsigned long flags;
2817 unsigned short val;
2818
2819 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2820 spin_lock_irqsave(&info->lock,flags);
2821 info->if_mode = if_mode;
2822
2823 msc_set_vcr(info);
2824
2825 /* TCR (tx control) 07 1=RTS driver control */
2826 val = rd_reg16(info, TCR);
2827 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2828 val |= BIT7;
2829 else
2830 val &= ~BIT7;
2831 wr_reg16(info, TCR, val);
2832
2833 spin_unlock_irqrestore(&info->lock,flags);
2834 return 0;
2835 }
2836
2837 /*
2838 * set general purpose IO pin state and direction
2839 *
2840 * user_gpio fields:
2841 * state each bit indicates a pin state
2842 * smask set bit indicates pin state to set
2843 * dir each bit indicates a pin direction (0=input, 1=output)
2844 * dmask set bit indicates pin direction to set
2845 */
2846 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2847 {
2848 unsigned long flags;
2849 struct gpio_desc gpio;
2850 __u32 data;
2851
2852 if (!info->gpio_present)
2853 return -EINVAL;
2854 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2855 return -EFAULT;
2856 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2857 info->device_name, gpio.state, gpio.smask,
2858 gpio.dir, gpio.dmask));
2859
2860 spin_lock_irqsave(&info->lock,flags);
2861 if (gpio.dmask) {
2862 data = rd_reg32(info, IODR);
2863 data |= gpio.dmask & gpio.dir;
2864 data &= ~(gpio.dmask & ~gpio.dir);
2865 wr_reg32(info, IODR, data);
2866 }
2867 if (gpio.smask) {
2868 data = rd_reg32(info, IOVR);
2869 data |= gpio.smask & gpio.state;
2870 data &= ~(gpio.smask & ~gpio.state);
2871 wr_reg32(info, IOVR, data);
2872 }
2873 spin_unlock_irqrestore(&info->lock,flags);
2874
2875 return 0;
2876 }
2877
2878 /*
2879 * get general purpose IO pin state and direction
2880 */
2881 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2882 {
2883 struct gpio_desc gpio;
2884 if (!info->gpio_present)
2885 return -EINVAL;
2886 gpio.state = rd_reg32(info, IOVR);
2887 gpio.smask = 0xffffffff;
2888 gpio.dir = rd_reg32(info, IODR);
2889 gpio.dmask = 0xffffffff;
2890 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2891 return -EFAULT;
2892 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2893 info->device_name, gpio.state, gpio.dir));
2894 return 0;
2895 }
2896
2897 /*
2898 * conditional wait facility
2899 */
2900 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2901 {
2902 init_waitqueue_head(&w->q);
2903 init_waitqueue_entry(&w->wait, current);
2904 w->data = data;
2905 }
2906
2907 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2908 {
2909 set_current_state(TASK_INTERRUPTIBLE);
2910 add_wait_queue(&w->q, &w->wait);
2911 w->next = *head;
2912 *head = w;
2913 }
2914
2915 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2916 {
2917 struct cond_wait *w, *prev;
2918 remove_wait_queue(&cw->q, &cw->wait);
2919 set_current_state(TASK_RUNNING);
2920 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2921 if (w == cw) {
2922 if (prev != NULL)
2923 prev->next = w->next;
2924 else
2925 *head = w->next;
2926 break;
2927 }
2928 }
2929 }
2930
2931 static void flush_cond_wait(struct cond_wait **head)
2932 {
2933 while (*head != NULL) {
2934 wake_up_interruptible(&(*head)->q);
2935 *head = (*head)->next;
2936 }
2937 }
2938
2939 /*
2940 * wait for general purpose I/O pin(s) to enter specified state
2941 *
2942 * user_gpio fields:
2943 * state - bit indicates target pin state
2944 * smask - set bit indicates watched pin
2945 *
2946 * The wait ends when at least one watched pin enters the specified
2947 * state. When 0 (no error) is returned, user_gpio->state is set to the
2948 * state of all GPIO pins when the wait ends.
2949 *
2950 * Note: Each pin may be a dedicated input, dedicated output, or
2951 * configurable input/output. The number and configuration of pins
2952 * varies with the specific adapter model. Only input pins (dedicated
2953 * or configured) can be monitored with this function.
2954 */
2955 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2956 {
2957 unsigned long flags;
2958 int rc = 0;
2959 struct gpio_desc gpio;
2960 struct cond_wait wait;
2961 u32 state;
2962
2963 if (!info->gpio_present)
2964 return -EINVAL;
2965 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2966 return -EFAULT;
2967 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2968 info->device_name, gpio.state, gpio.smask));
2969 /* ignore output pins identified by set IODR bit */
2970 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2971 return -EINVAL;
2972 init_cond_wait(&wait, gpio.smask);
2973
2974 spin_lock_irqsave(&info->lock, flags);
2975 /* enable interrupts for watched pins */
2976 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2977 /* get current pin states */
2978 state = rd_reg32(info, IOVR);
2979
2980 if (gpio.smask & ~(state ^ gpio.state)) {
2981 /* already in target state */
2982 gpio.state = state;
2983 } else {
2984 /* wait for target state */
2985 add_cond_wait(&info->gpio_wait_q, &wait);
2986 spin_unlock_irqrestore(&info->lock, flags);
2987 schedule();
2988 if (signal_pending(current))
2989 rc = -ERESTARTSYS;
2990 else
2991 gpio.state = wait.data;
2992 spin_lock_irqsave(&info->lock, flags);
2993 remove_cond_wait(&info->gpio_wait_q, &wait);
2994 }
2995
2996 /* disable all GPIO interrupts if no waiting processes */
2997 if (info->gpio_wait_q == NULL)
2998 wr_reg32(info, IOER, 0);
2999 spin_unlock_irqrestore(&info->lock,flags);
3000
3001 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3002 rc = -EFAULT;
3003 return rc;
3004 }
3005
3006 static int modem_input_wait(struct slgt_info *info,int arg)
3007 {
3008 unsigned long flags;
3009 int rc;
3010 struct mgsl_icount cprev, cnow;
3011 DECLARE_WAITQUEUE(wait, current);
3012
3013 /* save current irq counts */
3014 spin_lock_irqsave(&info->lock,flags);
3015 cprev = info->icount;
3016 add_wait_queue(&info->status_event_wait_q, &wait);
3017 set_current_state(TASK_INTERRUPTIBLE);
3018 spin_unlock_irqrestore(&info->lock,flags);
3019
3020 for(;;) {
3021 schedule();
3022 if (signal_pending(current)) {
3023 rc = -ERESTARTSYS;
3024 break;
3025 }
3026
3027 /* get new irq counts */
3028 spin_lock_irqsave(&info->lock,flags);
3029 cnow = info->icount;
3030 set_current_state(TASK_INTERRUPTIBLE);
3031 spin_unlock_irqrestore(&info->lock,flags);
3032
3033 /* if no change, wait aborted for some reason */
3034 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3035 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3036 rc = -EIO;
3037 break;
3038 }
3039
3040 /* check for change in caller specified modem input */
3041 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3042 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3043 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3044 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3045 rc = 0;
3046 break;
3047 }
3048
3049 cprev = cnow;
3050 }
3051 remove_wait_queue(&info->status_event_wait_q, &wait);
3052 set_current_state(TASK_RUNNING);
3053 return rc;
3054 }
3055
3056 /*
3057 * return state of serial control and status signals
3058 */
3059 static int tiocmget(struct tty_struct *tty, struct file *file)
3060 {
3061 struct slgt_info *info = tty->driver_data;
3062 unsigned int result;
3063 unsigned long flags;
3064
3065 spin_lock_irqsave(&info->lock,flags);
3066 get_signals(info);
3067 spin_unlock_irqrestore(&info->lock,flags);
3068
3069 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3070 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3071 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3072 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3073 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3074 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3075
3076 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3077 return result;
3078 }
3079
3080 /*
3081 * set modem control signals (DTR/RTS)
3082 *
3083 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3084 * TIOCMSET = set/clear signal values
3085 * value bit mask for command
3086 */
3087 static int tiocmset(struct tty_struct *tty, struct file *file,
3088 unsigned int set, unsigned int clear)
3089 {
3090 struct slgt_info *info = tty->driver_data;
3091 unsigned long flags;
3092
3093 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3094
3095 if (set & TIOCM_RTS)
3096 info->signals |= SerialSignal_RTS;
3097 if (set & TIOCM_DTR)
3098 info->signals |= SerialSignal_DTR;
3099 if (clear & TIOCM_RTS)
3100 info->signals &= ~SerialSignal_RTS;
3101 if (clear & TIOCM_DTR)
3102 info->signals &= ~SerialSignal_DTR;
3103
3104 spin_lock_irqsave(&info->lock,flags);
3105 set_signals(info);
3106 spin_unlock_irqrestore(&info->lock,flags);
3107 return 0;
3108 }
3109
3110 /*
3111 * block current process until the device is ready to open
3112 */
3113 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3114 struct slgt_info *info)
3115 {
3116 DECLARE_WAITQUEUE(wait, current);
3117 int retval;
3118 int do_clocal = 0, extra_count = 0;
3119 unsigned long flags;
3120
3121 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3122
3123 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3124 /* nonblock mode is set or port is not enabled */
3125 info->flags |= ASYNC_NORMAL_ACTIVE;
3126 return 0;
3127 }
3128
3129 if (tty->termios->c_cflag & CLOCAL)
3130 do_clocal = 1;
3131
3132 /* Wait for carrier detect and the line to become
3133 * free (i.e., not in use by the callout). While we are in
3134 * this loop, info->count is dropped by one, so that
3135 * close() knows when to free things. We restore it upon
3136 * exit, either normal or abnormal.
3137 */
3138
3139 retval = 0;
3140 add_wait_queue(&info->open_wait, &wait);
3141
3142 spin_lock_irqsave(&info->lock, flags);
3143 if (!tty_hung_up_p(filp)) {
3144 extra_count = 1;
3145 info->count--;
3146 }
3147 spin_unlock_irqrestore(&info->lock, flags);
3148 info->blocked_open++;
3149
3150 while (1) {
3151 if ((tty->termios->c_cflag & CBAUD)) {
3152 spin_lock_irqsave(&info->lock,flags);
3153 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3154 set_signals(info);
3155 spin_unlock_irqrestore(&info->lock,flags);
3156 }
3157
3158 set_current_state(TASK_INTERRUPTIBLE);
3159
3160 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3161 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3162 -EAGAIN : -ERESTARTSYS;
3163 break;
3164 }
3165
3166 spin_lock_irqsave(&info->lock,flags);
3167 get_signals(info);
3168 spin_unlock_irqrestore(&info->lock,flags);
3169
3170 if (!(info->flags & ASYNC_CLOSING) &&
3171 (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3172 break;
3173 }
3174
3175 if (signal_pending(current)) {
3176 retval = -ERESTARTSYS;
3177 break;
3178 }
3179
3180 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3181 schedule();
3182 }
3183
3184 set_current_state(TASK_RUNNING);
3185 remove_wait_queue(&info->open_wait, &wait);
3186
3187 if (extra_count)
3188 info->count++;
3189 info->blocked_open--;
3190
3191 if (!retval)
3192 info->flags |= ASYNC_NORMAL_ACTIVE;
3193
3194 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3195 return retval;
3196 }
3197
3198 static int alloc_tmp_rbuf(struct slgt_info *info)
3199 {
3200 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3201 if (info->tmp_rbuf == NULL)
3202 return -ENOMEM;
3203 return 0;
3204 }
3205
3206 static void free_tmp_rbuf(struct slgt_info *info)
3207 {
3208 kfree(info->tmp_rbuf);
3209 info->tmp_rbuf = NULL;
3210 }
3211
3212 /*
3213 * allocate DMA descriptor lists.
3214 */
3215 static int alloc_desc(struct slgt_info *info)
3216 {
3217 unsigned int i;
3218 unsigned int pbufs;
3219
3220 /* allocate memory to hold descriptor lists */
3221 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3222 if (info->bufs == NULL)
3223 return -ENOMEM;
3224
3225 memset(info->bufs, 0, DESC_LIST_SIZE);
3226
3227 info->rbufs = (struct slgt_desc*)info->bufs;
3228 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3229
3230 pbufs = (unsigned int)info->bufs_dma_addr;
3231
3232 /*
3233 * Build circular lists of descriptors
3234 */
3235
3236 for (i=0; i < info->rbuf_count; i++) {
3237 /* physical address of this descriptor */
3238 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3239
3240 /* physical address of next descriptor */
3241 if (i == info->rbuf_count - 1)
3242 info->rbufs[i].next = cpu_to_le32(pbufs);
3243 else
3244 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3245 set_desc_count(info->rbufs[i], DMABUFSIZE);
3246 }
3247
3248 for (i=0; i < info->tbuf_count; i++) {
3249 /* physical address of this descriptor */
3250 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3251
3252 /* physical address of next descriptor */
3253 if (i == info->tbuf_count - 1)
3254 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3255 else
3256 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3257 }
3258
3259 return 0;
3260 }
3261
3262 static void free_desc(struct slgt_info *info)
3263 {
3264 if (info->bufs != NULL) {
3265 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3266 info->bufs = NULL;
3267 info->rbufs = NULL;
3268 info->tbufs = NULL;
3269 }
3270 }
3271
3272 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3273 {
3274 int i;
3275 for (i=0; i < count; i++) {
3276 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3277 return -ENOMEM;
3278 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3279 }
3280 return 0;
3281 }
3282
3283 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3284 {
3285 int i;
3286 for (i=0; i < count; i++) {
3287 if (bufs[i].buf == NULL)
3288 continue;
3289 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3290 bufs[i].buf = NULL;
3291 }
3292 }
3293
3294 static int alloc_dma_bufs(struct slgt_info *info)
3295 {
3296 info->rbuf_count = 32;
3297 info->tbuf_count = 32;
3298
3299 if (alloc_desc(info) < 0 ||
3300 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3301 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3302 alloc_tmp_rbuf(info) < 0) {
3303 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3304 return -ENOMEM;
3305 }
3306 reset_rbufs(info);
3307 return 0;
3308 }
3309
3310 static void free_dma_bufs(struct slgt_info *info)
3311 {
3312 if (info->bufs) {
3313 free_bufs(info, info->rbufs, info->rbuf_count);
3314 free_bufs(info, info->tbufs, info->tbuf_count);
3315 free_desc(info);
3316 }
3317 free_tmp_rbuf(info);
3318 }
3319
3320 static int claim_resources(struct slgt_info *info)
3321 {
3322 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3323 DBGERR(("%s reg addr conflict, addr=%08X\n",
3324 info->device_name, info->phys_reg_addr));
3325 info->init_error = DiagStatus_AddressConflict;
3326 goto errout;
3327 }
3328 else
3329 info->reg_addr_requested = 1;
3330
3331 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3332 if (!info->reg_addr) {
3333 DBGERR(("%s cant map device registers, addr=%08X\n",
3334 info->device_name, info->phys_reg_addr));
3335 info->init_error = DiagStatus_CantAssignPciResources;
3336 goto errout;
3337 }
3338 return 0;
3339
3340 errout:
3341 release_resources(info);
3342 return -ENODEV;
3343 }
3344
3345 static void release_resources(struct slgt_info *info)
3346 {
3347 if (info->irq_requested) {
3348 free_irq(info->irq_level, info);
3349 info->irq_requested = 0;
3350 }
3351
3352 if (info->reg_addr_requested) {
3353 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3354 info->reg_addr_requested = 0;
3355 }
3356
3357 if (info->reg_addr) {
3358 iounmap(info->reg_addr);
3359 info->reg_addr = NULL;
3360 }
3361 }
3362
3363 /* Add the specified device instance data structure to the
3364 * global linked list of devices and increment the device count.
3365 */
3366 static void add_device(struct slgt_info *info)
3367 {
3368 char *devstr;
3369
3370 info->next_device = NULL;
3371 info->line = slgt_device_count;
3372 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3373
3374 if (info->line < MAX_DEVICES) {
3375 if (maxframe[info->line])
3376 info->max_frame_size = maxframe[info->line];
3377 info->dosyncppp = dosyncppp[info->line];
3378 }
3379
3380 slgt_device_count++;
3381
3382 if (!slgt_device_list)
3383 slgt_device_list = info;
3384 else {
3385 struct slgt_info *current_dev = slgt_device_list;
3386 while(current_dev->next_device)
3387 current_dev = current_dev->next_device;
3388 current_dev->next_device = info;
3389 }
3390
3391 if (info->max_frame_size < 4096)
3392 info->max_frame_size = 4096;
3393 else if (info->max_frame_size > 65535)
3394 info->max_frame_size = 65535;
3395
3396 switch(info->pdev->device) {
3397 case SYNCLINK_GT_DEVICE_ID:
3398 devstr = "GT";
3399 break;
3400 case SYNCLINK_GT2_DEVICE_ID:
3401 devstr = "GT2";
3402 break;
3403 case SYNCLINK_GT4_DEVICE_ID:
3404 devstr = "GT4";
3405 break;
3406 case SYNCLINK_AC_DEVICE_ID:
3407 devstr = "AC";
3408 info->params.mode = MGSL_MODE_ASYNC;
3409 break;
3410 default:
3411 devstr = "(unknown model)";
3412 }
3413 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3414 devstr, info->device_name, info->phys_reg_addr,
3415 info->irq_level, info->max_frame_size);
3416
3417 #if SYNCLINK_GENERIC_HDLC
3418 hdlcdev_init(info);
3419 #endif
3420 }
3421
3422 /*
3423 * allocate device instance structure, return NULL on failure
3424 */
3425 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3426 {
3427 struct slgt_info *info;
3428
3429 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3430
3431 if (!info) {
3432 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3433 driver_name, adapter_num, port_num));
3434 } else {
3435 info->magic = MGSL_MAGIC;
3436 INIT_WORK(&info->task, bh_handler);
3437 info->max_frame_size = 4096;
3438 info->raw_rx_size = DMABUFSIZE;
3439 info->close_delay = 5*HZ/10;
3440 info->closing_wait = 30*HZ;
3441 init_waitqueue_head(&info->open_wait);
3442 init_waitqueue_head(&info->close_wait);
3443 init_waitqueue_head(&info->status_event_wait_q);
3444 init_waitqueue_head(&info->event_wait_q);
3445 spin_lock_init(&info->netlock);
3446 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3447 info->idle_mode = HDLC_TXIDLE_FLAGS;
3448 info->adapter_num = adapter_num;
3449 info->port_num = port_num;
3450
3451 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3452 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3453
3454 /* Copy configuration info to device instance data */
3455 info->pdev = pdev;
3456 info->irq_level = pdev->irq;
3457 info->phys_reg_addr = pci_resource_start(pdev,0);
3458
3459 info->bus_type = MGSL_BUS_TYPE_PCI;
3460 info->irq_flags = IRQF_SHARED;
3461
3462 info->init_error = -1; /* assume error, set to 0 on successful init */
3463 }
3464
3465 return info;
3466 }
3467
3468 static void device_init(int adapter_num, struct pci_dev *pdev)
3469 {
3470 struct slgt_info *port_array[SLGT_MAX_PORTS];
3471 int i;
3472 int port_count = 1;
3473
3474 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3475 port_count = 2;
3476 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3477 port_count = 4;
3478
3479 /* allocate device instances for all ports */
3480 for (i=0; i < port_count; ++i) {
3481 port_array[i] = alloc_dev(adapter_num, i, pdev);
3482 if (port_array[i] == NULL) {
3483 for (--i; i >= 0; --i)
3484 kfree(port_array[i]);
3485 return;
3486 }
3487 }
3488
3489 /* give copy of port_array to all ports and add to device list */
3490 for (i=0; i < port_count; ++i) {
3491 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3492 add_device(port_array[i]);
3493 port_array[i]->port_count = port_count;
3494 spin_lock_init(&port_array[i]->lock);
3495 }
3496
3497 /* Allocate and claim adapter resources */
3498 if (!claim_resources(port_array[0])) {
3499
3500 alloc_dma_bufs(port_array[0]);
3501
3502 /* copy resource information from first port to others */
3503 for (i = 1; i < port_count; ++i) {
3504 port_array[i]->lock = port_array[0]->lock;
3505 port_array[i]->irq_level = port_array[0]->irq_level;
3506 port_array[i]->reg_addr = port_array[0]->reg_addr;
3507 alloc_dma_bufs(port_array[i]);
3508 }
3509
3510 if (request_irq(port_array[0]->irq_level,
3511 slgt_interrupt,
3512 port_array[0]->irq_flags,
3513 port_array[0]->device_name,
3514 port_array[0]) < 0) {
3515 DBGERR(("%s request_irq failed IRQ=%d\n",
3516 port_array[0]->device_name,
3517 port_array[0]->irq_level));
3518 } else {
3519 port_array[0]->irq_requested = 1;
3520 adapter_test(port_array[0]);
3521 for (i=1 ; i < port_count ; i++) {
3522 port_array[i]->init_error = port_array[0]->init_error;
3523 port_array[i]->gpio_present = port_array[0]->gpio_present;
3524 }
3525 }
3526 }
3527
3528 for (i=0; i < port_count; ++i)
3529 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3530 }
3531
3532 static int __devinit init_one(struct pci_dev *dev,
3533 const struct pci_device_id *ent)
3534 {
3535 if (pci_enable_device(dev)) {
3536 printk("error enabling pci device %p\n", dev);
3537 return -EIO;
3538 }
3539 pci_set_master(dev);
3540 device_init(slgt_device_count, dev);
3541 return 0;
3542 }
3543
3544 static void __devexit remove_one(struct pci_dev *dev)
3545 {
3546 }
3547
3548 static const struct tty_operations ops = {
3549 .open = open,
3550 .close = close,
3551 .write = write,
3552 .put_char = put_char,
3553 .flush_chars = flush_chars,
3554 .write_room = write_room,
3555 .chars_in_buffer = chars_in_buffer,
3556 .flush_buffer = flush_buffer,
3557 .ioctl = ioctl,
3558 .compat_ioctl = slgt_compat_ioctl,
3559 .throttle = throttle,
3560 .unthrottle = unthrottle,
3561 .send_xchar = send_xchar,
3562 .break_ctl = set_break,
3563 .wait_until_sent = wait_until_sent,
3564 .read_proc = read_proc,
3565 .set_termios = set_termios,
3566 .stop = tx_hold,
3567 .start = tx_release,
3568 .hangup = hangup,
3569 .tiocmget = tiocmget,
3570 .tiocmset = tiocmset,
3571 };
3572
3573 static void slgt_cleanup(void)
3574 {
3575 int rc;
3576 struct slgt_info *info;
3577 struct slgt_info *tmp;
3578
3579 printk("unload %s %s\n", driver_name, driver_version);
3580
3581 if (serial_driver) {
3582 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3583 tty_unregister_device(serial_driver, info->line);
3584 if ((rc = tty_unregister_driver(serial_driver)))
3585 DBGERR(("tty_unregister_driver error=%d\n", rc));
3586 put_tty_driver(serial_driver);
3587 }
3588
3589 /* reset devices */
3590 info = slgt_device_list;
3591 while(info) {
3592 reset_port(info);
3593 info = info->next_device;
3594 }
3595
3596 /* release devices */
3597 info = slgt_device_list;
3598 while(info) {
3599 #if SYNCLINK_GENERIC_HDLC
3600 hdlcdev_exit(info);
3601 #endif
3602 free_dma_bufs(info);
3603 free_tmp_rbuf(info);
3604 if (info->port_num == 0)
3605 release_resources(info);
3606 tmp = info;
3607 info = info->next_device;
3608 kfree(tmp);
3609 }
3610
3611 if (pci_registered)
3612 pci_unregister_driver(&pci_driver);
3613 }
3614
3615 /*
3616 * Driver initialization entry point.
3617 */
3618 static int __init slgt_init(void)
3619 {
3620 int rc;
3621
3622 printk("%s %s\n", driver_name, driver_version);
3623
3624 serial_driver = alloc_tty_driver(MAX_DEVICES);
3625 if (!serial_driver) {
3626 printk("%s can't allocate tty driver\n", driver_name);
3627 return -ENOMEM;
3628 }
3629
3630 /* Initialize the tty_driver structure */
3631
3632 serial_driver->owner = THIS_MODULE;
3633 serial_driver->driver_name = tty_driver_name;
3634 serial_driver->name = tty_dev_prefix;
3635 serial_driver->major = ttymajor;
3636 serial_driver->minor_start = 64;
3637 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3638 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3639 serial_driver->init_termios = tty_std_termios;
3640 serial_driver->init_termios.c_cflag =
3641 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3642 serial_driver->init_termios.c_ispeed = 9600;
3643 serial_driver->init_termios.c_ospeed = 9600;
3644 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3645 tty_set_operations(serial_driver, &ops);
3646 if ((rc = tty_register_driver(serial_driver)) < 0) {
3647 DBGERR(("%s can't register serial driver\n", driver_name));
3648 put_tty_driver(serial_driver);
3649 serial_driver = NULL;
3650 goto error;
3651 }
3652
3653 printk("%s %s, tty major#%d\n",
3654 driver_name, driver_version,
3655 serial_driver->major);
3656
3657 slgt_device_count = 0;
3658 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3659 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3660 goto error;
3661 }
3662 pci_registered = 1;
3663
3664 if (!slgt_device_list)
3665 printk("%s no devices found\n",driver_name);
3666
3667 return 0;
3668
3669 error:
3670 slgt_cleanup();
3671 return rc;
3672 }
3673
3674 static void __exit slgt_exit(void)
3675 {
3676 slgt_cleanup();
3677 }
3678
3679 module_init(slgt_init);
3680 module_exit(slgt_exit);
3681
3682 /*
3683 * register access routines
3684 */
3685
3686 #define CALC_REGADDR() \
3687 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3688 if (addr >= 0x80) \
3689 reg_addr += (info->port_num) * 32;
3690
3691 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3692 {
3693 CALC_REGADDR();
3694 return readb((void __iomem *)reg_addr);
3695 }
3696
3697 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3698 {
3699 CALC_REGADDR();
3700 writeb(value, (void __iomem *)reg_addr);
3701 }
3702
3703 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3704 {
3705 CALC_REGADDR();
3706 return readw((void __iomem *)reg_addr);
3707 }
3708
3709 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3710 {
3711 CALC_REGADDR();
3712 writew(value, (void __iomem *)reg_addr);
3713 }
3714
3715 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3716 {
3717 CALC_REGADDR();
3718 return readl((void __iomem *)reg_addr);
3719 }
3720
3721 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3722 {
3723 CALC_REGADDR();
3724 writel(value, (void __iomem *)reg_addr);
3725 }
3726
3727 static void rdma_reset(struct slgt_info *info)
3728 {
3729 unsigned int i;
3730
3731 /* set reset bit */
3732 wr_reg32(info, RDCSR, BIT1);
3733
3734 /* wait for enable bit cleared */
3735 for(i=0 ; i < 1000 ; i++)
3736 if (!(rd_reg32(info, RDCSR) & BIT0))
3737 break;
3738 }
3739
3740 static void tdma_reset(struct slgt_info *info)
3741 {
3742 unsigned int i;
3743
3744 /* set reset bit */
3745 wr_reg32(info, TDCSR, BIT1);
3746
3747 /* wait for enable bit cleared */
3748 for(i=0 ; i < 1000 ; i++)
3749 if (!(rd_reg32(info, TDCSR) & BIT0))
3750 break;
3751 }
3752
3753 /*
3754 * enable internal loopback
3755 * TxCLK and RxCLK are generated from BRG
3756 * and TxD is looped back to RxD internally.
3757 */
3758 static void enable_loopback(struct slgt_info *info)
3759 {
3760 /* SCR (serial control) BIT2=looopback enable */
3761 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3762
3763 if (info->params.mode != MGSL_MODE_ASYNC) {
3764 /* CCR (clock control)
3765 * 07..05 tx clock source (010 = BRG)
3766 * 04..02 rx clock source (010 = BRG)
3767 * 01 auxclk enable (0 = disable)
3768 * 00 BRG enable (1 = enable)
3769 *
3770 * 0100 1001
3771 */
3772 wr_reg8(info, CCR, 0x49);
3773
3774 /* set speed if available, otherwise use default */
3775 if (info->params.clock_speed)
3776 set_rate(info, info->params.clock_speed);
3777 else
3778 set_rate(info, 3686400);
3779 }
3780 }
3781
3782 /*
3783 * set baud rate generator to specified rate
3784 */
3785 static void set_rate(struct slgt_info *info, u32 rate)
3786 {
3787 unsigned int div;
3788 static unsigned int osc = 14745600;
3789
3790 /* div = osc/rate - 1
3791 *
3792 * Round div up if osc/rate is not integer to
3793 * force to next slowest rate.
3794 */
3795
3796 if (rate) {
3797 div = osc/rate;
3798 if (!(osc % rate) && div)
3799 div--;
3800 wr_reg16(info, BDR, (unsigned short)div);
3801 }
3802 }
3803
3804 static void rx_stop(struct slgt_info *info)
3805 {
3806 unsigned short val;
3807
3808 /* disable and reset receiver */
3809 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3810 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3811 wr_reg16(info, RCR, val); /* clear reset bit */
3812
3813 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3814
3815 /* clear pending rx interrupts */
3816 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3817
3818 rdma_reset(info);
3819
3820 info->rx_enabled = 0;
3821 info->rx_restart = 0;
3822 }
3823
3824 static void rx_start(struct slgt_info *info)
3825 {
3826 unsigned short val;
3827
3828 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3829
3830 /* clear pending rx overrun IRQ */
3831 wr_reg16(info, SSR, IRQ_RXOVER);
3832
3833 /* reset and disable receiver */
3834 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3835 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3836 wr_reg16(info, RCR, val); /* clear reset bit */
3837
3838 rdma_reset(info);
3839 reset_rbufs(info);
3840
3841 /* set 1st descriptor address */
3842 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3843
3844 if (info->params.mode != MGSL_MODE_ASYNC) {
3845 /* enable rx DMA and DMA interrupt */
3846 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3847 } else {
3848 /* enable saving of rx status, rx DMA and DMA interrupt */
3849 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3850 }
3851
3852 slgt_irq_on(info, IRQ_RXOVER);
3853
3854 /* enable receiver */
3855 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3856
3857 info->rx_restart = 0;
3858 info->rx_enabled = 1;
3859 }
3860
3861 static void tx_start(struct slgt_info *info)
3862 {
3863 if (!info->tx_enabled) {
3864 wr_reg16(info, TCR,
3865 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3866 info->tx_enabled = TRUE;
3867 }
3868
3869 if (info->tx_count) {
3870 info->drop_rts_on_tx_done = 0;
3871
3872 if (info->params.mode != MGSL_MODE_ASYNC) {
3873 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3874 get_signals(info);
3875 if (!(info->signals & SerialSignal_RTS)) {
3876 info->signals |= SerialSignal_RTS;
3877 set_signals(info);
3878 info->drop_rts_on_tx_done = 1;
3879 }
3880 }
3881
3882 slgt_irq_off(info, IRQ_TXDATA);
3883 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3884 /* clear tx idle and underrun status bits */
3885 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3886 if (info->params.mode == MGSL_MODE_HDLC)
3887 mod_timer(&info->tx_timer, jiffies +
3888 msecs_to_jiffies(5000));
3889 } else {
3890 slgt_irq_off(info, IRQ_TXDATA);
3891 slgt_irq_on(info, IRQ_TXIDLE);
3892 /* clear tx idle status bit */
3893 wr_reg16(info, SSR, IRQ_TXIDLE);
3894 }
3895 tdma_start(info);
3896 info->tx_active = 1;
3897 }
3898 }
3899
3900 /*
3901 * start transmit DMA if inactive and there are unsent buffers
3902 */
3903 static void tdma_start(struct slgt_info *info)
3904 {
3905 unsigned int i;
3906
3907 if (rd_reg32(info, TDCSR) & BIT0)
3908 return;
3909
3910 /* transmit DMA inactive, check for unsent buffers */
3911 i = info->tbuf_start;
3912 while (!desc_count(info->tbufs[i])) {
3913 if (++i == info->tbuf_count)
3914 i = 0;
3915 if (i == info->tbuf_current)
3916 return;
3917 }
3918 info->tbuf_start = i;
3919
3920 /* there are unsent buffers, start transmit DMA */
3921
3922 /* reset needed if previous error condition */
3923 tdma_reset(info);
3924
3925 /* set 1st descriptor address */
3926 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3927 switch(info->params.mode) {
3928 case MGSL_MODE_RAW:
3929 case MGSL_MODE_MONOSYNC:
3930 case MGSL_MODE_BISYNC:
3931 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3932 break;
3933 default:
3934 wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3935 }
3936 }
3937
3938 static void tx_stop(struct slgt_info *info)
3939 {
3940 unsigned short val;
3941
3942 del_timer(&info->tx_timer);
3943
3944 tdma_reset(info);
3945
3946 /* reset and disable transmitter */
3947 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3948 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3949
3950 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3951
3952 /* clear tx idle and underrun status bit */
3953 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3954
3955 reset_tbufs(info);
3956
3957 info->tx_enabled = 0;
3958 info->tx_active = 0;
3959 }
3960
3961 static void reset_port(struct slgt_info *info)
3962 {
3963 if (!info->reg_addr)
3964 return;
3965
3966 tx_stop(info);
3967 rx_stop(info);
3968
3969 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3970 set_signals(info);
3971
3972 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3973 }
3974
3975 static void reset_adapter(struct slgt_info *info)
3976 {
3977 int i;
3978 for (i=0; i < info->port_count; ++i) {
3979 if (info->port_array[i])
3980 reset_port(info->port_array[i]);
3981 }
3982 }
3983
3984 static void async_mode(struct slgt_info *info)
3985 {
3986 unsigned short val;
3987
3988 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3989 tx_stop(info);
3990 rx_stop(info);
3991
3992 /* TCR (tx control)
3993 *
3994 * 15..13 mode, 010=async
3995 * 12..10 encoding, 000=NRZ
3996 * 09 parity enable
3997 * 08 1=odd parity, 0=even parity
3998 * 07 1=RTS driver control
3999 * 06 1=break enable
4000 * 05..04 character length
4001 * 00=5 bits
4002 * 01=6 bits
4003 * 10=7 bits
4004 * 11=8 bits
4005 * 03 0=1 stop bit, 1=2 stop bits
4006 * 02 reset
4007 * 01 enable
4008 * 00 auto-CTS enable
4009 */
4010 val = 0x4000;
4011
4012 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4013 val |= BIT7;
4014
4015 if (info->params.parity != ASYNC_PARITY_NONE) {
4016 val |= BIT9;
4017 if (info->params.parity == ASYNC_PARITY_ODD)
4018 val |= BIT8;
4019 }
4020
4021 switch (info->params.data_bits)
4022 {
4023 case 6: val |= BIT4; break;
4024 case 7: val |= BIT5; break;
4025 case 8: val |= BIT5 + BIT4; break;
4026 }
4027
4028 if (info->params.stop_bits != 1)
4029 val |= BIT3;
4030
4031 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4032 val |= BIT0;
4033
4034 wr_reg16(info, TCR, val);
4035
4036 /* RCR (rx control)
4037 *
4038 * 15..13 mode, 010=async
4039 * 12..10 encoding, 000=NRZ
4040 * 09 parity enable
4041 * 08 1=odd parity, 0=even parity
4042 * 07..06 reserved, must be 0
4043 * 05..04 character length
4044 * 00=5 bits
4045 * 01=6 bits
4046 * 10=7 bits
4047 * 11=8 bits
4048 * 03 reserved, must be zero
4049 * 02 reset
4050 * 01 enable
4051 * 00 auto-DCD enable
4052 */
4053 val = 0x4000;
4054
4055 if (info->params.parity != ASYNC_PARITY_NONE) {
4056 val |= BIT9;
4057 if (info->params.parity == ASYNC_PARITY_ODD)
4058 val |= BIT8;
4059 }
4060
4061 switch (info->params.data_bits)
4062 {
4063 case 6: val |= BIT4; break;
4064 case 7: val |= BIT5; break;
4065 case 8: val |= BIT5 + BIT4; break;
4066 }
4067
4068 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4069 val |= BIT0;
4070
4071 wr_reg16(info, RCR, val);
4072
4073 /* CCR (clock control)
4074 *
4075 * 07..05 011 = tx clock source is BRG/16
4076 * 04..02 010 = rx clock source is BRG
4077 * 01 0 = auxclk disabled
4078 * 00 1 = BRG enabled
4079 *
4080 * 0110 1001
4081 */
4082 wr_reg8(info, CCR, 0x69);
4083
4084 msc_set_vcr(info);
4085
4086 /* SCR (serial control)
4087 *
4088 * 15 1=tx req on FIFO half empty
4089 * 14 1=rx req on FIFO half full
4090 * 13 tx data IRQ enable
4091 * 12 tx idle IRQ enable
4092 * 11 rx break on IRQ enable
4093 * 10 rx data IRQ enable
4094 * 09 rx break off IRQ enable
4095 * 08 overrun IRQ enable
4096 * 07 DSR IRQ enable
4097 * 06 CTS IRQ enable
4098 * 05 DCD IRQ enable
4099 * 04 RI IRQ enable
4100 * 03 reserved, must be zero
4101 * 02 1=txd->rxd internal loopback enable
4102 * 01 reserved, must be zero
4103 * 00 1=master IRQ enable
4104 */
4105 val = BIT15 + BIT14 + BIT0;
4106 wr_reg16(info, SCR, val);
4107
4108 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4109
4110 set_rate(info, info->params.data_rate * 16);
4111
4112 if (info->params.loopback)
4113 enable_loopback(info);
4114 }
4115
4116 static void sync_mode(struct slgt_info *info)
4117 {
4118 unsigned short val;
4119
4120 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4121 tx_stop(info);
4122 rx_stop(info);
4123
4124 /* TCR (tx control)
4125 *
4126 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4127 * 12..10 encoding
4128 * 09 CRC enable
4129 * 08 CRC32
4130 * 07 1=RTS driver control
4131 * 06 preamble enable
4132 * 05..04 preamble length
4133 * 03 share open/close flag
4134 * 02 reset
4135 * 01 enable
4136 * 00 auto-CTS enable
4137 */
4138 val = 0;
4139
4140 switch(info->params.mode) {
4141 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4142 case MGSL_MODE_BISYNC: val |= BIT15; break;
4143 case MGSL_MODE_RAW: val |= BIT13; break;
4144 }
4145 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4146 val |= BIT7;
4147
4148 switch(info->params.encoding)
4149 {
4150 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4151 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4152 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4153 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4154 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4155 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4156 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4157 }
4158
4159 switch (info->params.crc_type & HDLC_CRC_MASK)
4160 {
4161 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4162 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4163 }
4164
4165 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4166 val |= BIT6;
4167
4168 switch (info->params.preamble_length)
4169 {
4170 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4171 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4172 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4173 }
4174
4175 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4176 val |= BIT0;
4177
4178 wr_reg16(info, TCR, val);
4179
4180 /* TPR (transmit preamble) */
4181
4182 switch (info->params.preamble)
4183 {
4184 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4185 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4186 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4187 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4188 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4189 default: val = 0x7e; break;
4190 }
4191 wr_reg8(info, TPR, (unsigned char)val);
4192
4193 /* RCR (rx control)
4194 *
4195 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4196 * 12..10 encoding
4197 * 09 CRC enable
4198 * 08 CRC32
4199 * 07..03 reserved, must be 0
4200 * 02 reset
4201 * 01 enable
4202 * 00 auto-DCD enable
4203 */
4204 val = 0;
4205
4206 switch(info->params.mode) {
4207 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4208 case MGSL_MODE_BISYNC: val |= BIT15; break;
4209 case MGSL_MODE_RAW: val |= BIT13; break;
4210 }
4211
4212 switch(info->params.encoding)
4213 {
4214 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4215 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4216 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4217 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4218 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4219 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4220 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4221 }
4222
4223 switch (info->params.crc_type & HDLC_CRC_MASK)
4224 {
4225 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4226 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4227 }
4228
4229 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4230 val |= BIT0;
4231
4232 wr_reg16(info, RCR, val);
4233
4234 /* CCR (clock control)
4235 *
4236 * 07..05 tx clock source
4237 * 04..02 rx clock source
4238 * 01 auxclk enable
4239 * 00 BRG enable
4240 */
4241 val = 0;
4242
4243 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4244 {
4245 // when RxC source is DPLL, BRG generates 16X DPLL
4246 // reference clock, so take TxC from BRG/16 to get
4247 // transmit clock at actual data rate
4248 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4249 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4250 else
4251 val |= BIT6; /* 010, txclk = BRG */
4252 }
4253 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4254 val |= BIT7; /* 100, txclk = DPLL Input */
4255 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4256 val |= BIT5; /* 001, txclk = RXC Input */
4257
4258 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4259 val |= BIT3; /* 010, rxclk = BRG */
4260 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4261 val |= BIT4; /* 100, rxclk = DPLL */
4262 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4263 val |= BIT2; /* 001, rxclk = TXC Input */
4264
4265 if (info->params.clock_speed)
4266 val |= BIT1 + BIT0;
4267
4268 wr_reg8(info, CCR, (unsigned char)val);
4269
4270 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4271 {
4272 // program DPLL mode
4273 switch(info->params.encoding)
4274 {
4275 case HDLC_ENCODING_BIPHASE_MARK:
4276 case HDLC_ENCODING_BIPHASE_SPACE:
4277 val = BIT7; break;
4278 case HDLC_ENCODING_BIPHASE_LEVEL:
4279 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4280 val = BIT7 + BIT6; break;
4281 default: val = BIT6; // NRZ encodings
4282 }
4283 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4284
4285 // DPLL requires a 16X reference clock from BRG
4286 set_rate(info, info->params.clock_speed * 16);
4287 }
4288 else
4289 set_rate(info, info->params.clock_speed);
4290
4291 tx_set_idle(info);
4292
4293 msc_set_vcr(info);
4294
4295 /* SCR (serial control)
4296 *
4297 * 15 1=tx req on FIFO half empty
4298 * 14 1=rx req on FIFO half full
4299 * 13 tx data IRQ enable
4300 * 12 tx idle IRQ enable
4301 * 11 underrun IRQ enable
4302 * 10 rx data IRQ enable
4303 * 09 rx idle IRQ enable
4304 * 08 overrun IRQ enable
4305 * 07 DSR IRQ enable
4306 * 06 CTS IRQ enable
4307 * 05 DCD IRQ enable
4308 * 04 RI IRQ enable
4309 * 03 reserved, must be zero
4310 * 02 1=txd->rxd internal loopback enable
4311 * 01 reserved, must be zero
4312 * 00 1=master IRQ enable
4313 */
4314 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4315
4316 if (info->params.loopback)
4317 enable_loopback(info);
4318 }
4319
4320 /*
4321 * set transmit idle mode
4322 */
4323 static void tx_set_idle(struct slgt_info *info)
4324 {
4325 unsigned char val;
4326 unsigned short tcr;
4327
4328 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4329 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4330 */
4331 tcr = rd_reg16(info, TCR);
4332 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4333 /* disable preamble, set idle size to 16 bits */
4334 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4335 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4336 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4337 } else if (!(tcr & BIT6)) {
4338 /* preamble is disabled, set idle size to 8 bits */
4339 tcr &= ~(BIT5 + BIT4);
4340 }
4341 wr_reg16(info, TCR, tcr);
4342
4343 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4344 /* LSB of custom tx idle specified in tx idle register */
4345 val = (unsigned char)(info->idle_mode & 0xff);
4346 } else {
4347 /* standard 8 bit idle patterns */
4348 switch(info->idle_mode)
4349 {
4350 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4351 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4352 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4353 case HDLC_TXIDLE_ZEROS:
4354 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4355 default: val = 0xff;
4356 }
4357 }
4358
4359 wr_reg8(info, TIR, val);
4360 }
4361
4362 /*
4363 * get state of V24 status (input) signals
4364 */
4365 static void get_signals(struct slgt_info *info)
4366 {
4367 unsigned short status = rd_reg16(info, SSR);
4368
4369 /* clear all serial signals except DTR and RTS */
4370 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4371
4372 if (status & BIT3)
4373 info->signals |= SerialSignal_DSR;
4374 if (status & BIT2)
4375 info->signals |= SerialSignal_CTS;
4376 if (status & BIT1)
4377 info->signals |= SerialSignal_DCD;
4378 if (status & BIT0)
4379 info->signals |= SerialSignal_RI;
4380 }
4381
4382 /*
4383 * set V.24 Control Register based on current configuration
4384 */
4385 static void msc_set_vcr(struct slgt_info *info)
4386 {
4387 unsigned char val = 0;
4388
4389 /* VCR (V.24 control)
4390 *
4391 * 07..04 serial IF select
4392 * 03 DTR
4393 * 02 RTS
4394 * 01 LL
4395 * 00 RL
4396 */
4397
4398 switch(info->if_mode & MGSL_INTERFACE_MASK)
4399 {
4400 case MGSL_INTERFACE_RS232:
4401 val |= BIT5; /* 0010 */
4402 break;
4403 case MGSL_INTERFACE_V35:
4404 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4405 break;
4406 case MGSL_INTERFACE_RS422:
4407 val |= BIT6; /* 0100 */
4408 break;
4409 }
4410
4411 if (info->signals & SerialSignal_DTR)
4412 val |= BIT3;
4413 if (info->signals & SerialSignal_RTS)
4414 val |= BIT2;
4415 if (info->if_mode & MGSL_INTERFACE_LL)
4416 val |= BIT1;
4417 if (info->if_mode & MGSL_INTERFACE_RL)
4418 val |= BIT0;
4419 wr_reg8(info, VCR, val);
4420 }
4421
4422 /*
4423 * set state of V24 control (output) signals
4424 */
4425 static void set_signals(struct slgt_info *info)
4426 {
4427 unsigned char val = rd_reg8(info, VCR);
4428 if (info->signals & SerialSignal_DTR)
4429 val |= BIT3;
4430 else
4431 val &= ~BIT3;
4432 if (info->signals & SerialSignal_RTS)
4433 val |= BIT2;
4434 else
4435 val &= ~BIT2;
4436 wr_reg8(info, VCR, val);
4437 }
4438
4439 /*
4440 * free range of receive DMA buffers (i to last)
4441 */
4442 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4443 {
4444 int done = 0;
4445
4446 while(!done) {
4447 /* reset current buffer for reuse */
4448 info->rbufs[i].status = 0;
4449 switch(info->params.mode) {
4450 case MGSL_MODE_RAW:
4451 case MGSL_MODE_MONOSYNC:
4452 case MGSL_MODE_BISYNC:
4453 set_desc_count(info->rbufs[i], info->raw_rx_size);
4454 break;
4455 default:
4456 set_desc_count(info->rbufs[i], DMABUFSIZE);
4457 }
4458
4459 if (i == last)
4460 done = 1;
4461 if (++i == info->rbuf_count)
4462 i = 0;
4463 }
4464 info->rbuf_current = i;
4465 }
4466
4467 /*
4468 * mark all receive DMA buffers as free
4469 */
4470 static void reset_rbufs(struct slgt_info *info)
4471 {
4472 free_rbufs(info, 0, info->rbuf_count - 1);
4473 }
4474
4475 /*
4476 * pass receive HDLC frame to upper layer
4477 *
4478 * return 1 if frame available, otherwise 0
4479 */
4480 static int rx_get_frame(struct slgt_info *info)
4481 {
4482 unsigned int start, end;
4483 unsigned short status;
4484 unsigned int framesize = 0;
4485 int rc = 0;
4486 unsigned long flags;
4487 struct tty_struct *tty = info->tty;
4488 unsigned char addr_field = 0xff;
4489 unsigned int crc_size = 0;
4490
4491 switch (info->params.crc_type & HDLC_CRC_MASK) {
4492 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4493 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4494 }
4495
4496 check_again:
4497
4498 framesize = 0;
4499 addr_field = 0xff;
4500 start = end = info->rbuf_current;
4501
4502 for (;;) {
4503 if (!desc_complete(info->rbufs[end]))
4504 goto cleanup;
4505
4506 if (framesize == 0 && info->params.addr_filter != 0xff)
4507 addr_field = info->rbufs[end].buf[0];
4508
4509 framesize += desc_count(info->rbufs[end]);
4510
4511 if (desc_eof(info->rbufs[end]))
4512 break;
4513
4514 if (++end == info->rbuf_count)
4515 end = 0;
4516
4517 if (end == info->rbuf_current) {
4518 if (info->rx_enabled){
4519 spin_lock_irqsave(&info->lock,flags);
4520 rx_start(info);
4521 spin_unlock_irqrestore(&info->lock,flags);
4522 }
4523 goto cleanup;
4524 }
4525 }
4526
4527 /* status
4528 *
4529 * 15 buffer complete
4530 * 14..06 reserved
4531 * 05..04 residue
4532 * 02 eof (end of frame)
4533 * 01 CRC error
4534 * 00 abort
4535 */
4536 status = desc_status(info->rbufs[end]);
4537
4538 /* ignore CRC bit if not using CRC (bit is undefined) */
4539 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4540 status &= ~BIT1;
4541
4542 if (framesize == 0 ||
4543 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4544 free_rbufs(info, start, end);
4545 goto check_again;
4546 }
4547
4548 if (framesize < (2 + crc_size) || status & BIT0) {
4549 info->icount.rxshort++;
4550 framesize = 0;
4551 } else if (status & BIT1) {
4552 info->icount.rxcrc++;
4553 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4554 framesize = 0;
4555 }
4556
4557 #if SYNCLINK_GENERIC_HDLC
4558 if (framesize == 0) {
4559 struct net_device_stats *stats = hdlc_stats(info->netdev);
4560 stats->rx_errors++;
4561 stats->rx_frame_errors++;
4562 }
4563 #endif
4564
4565 DBGBH(("%s rx frame status=%04X size=%d\n",
4566 info->device_name, status, framesize));
4567 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
4568
4569 if (framesize) {
4570 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4571 framesize -= crc_size;
4572 crc_size = 0;
4573 }
4574
4575 if (framesize > info->max_frame_size + crc_size)
4576 info->icount.rxlong++;
4577 else {
4578 /* copy dma buffer(s) to contiguous temp buffer */
4579 int copy_count = framesize;
4580 int i = start;
4581 unsigned char *p = info->tmp_rbuf;
4582 info->tmp_rbuf_count = framesize;
4583
4584 info->icount.rxok++;
4585
4586 while(copy_count) {
4587 int partial_count = min(copy_count, DMABUFSIZE);
4588 memcpy(p, info->rbufs[i].buf, partial_count);
4589 p += partial_count;
4590 copy_count -= partial_count;
4591 if (++i == info->rbuf_count)
4592 i = 0;
4593 }
4594
4595 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4596 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4597 framesize++;
4598 }
4599
4600 #if SYNCLINK_GENERIC_HDLC
4601 if (info->netcount)
4602 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4603 else
4604 #endif
4605 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4606 }
4607 }
4608 free_rbufs(info, start, end);
4609 rc = 1;
4610
4611 cleanup:
4612 return rc;
4613 }
4614
4615 /*
4616 * pass receive buffer (RAW synchronous mode) to tty layer
4617 * return 1 if buffer available, otherwise 0
4618 */
4619 static int rx_get_buf(struct slgt_info *info)
4620 {
4621 unsigned int i = info->rbuf_current;
4622 unsigned int count;
4623
4624 if (!desc_complete(info->rbufs[i]))
4625 return 0;
4626 count = desc_count(info->rbufs[i]);
4627 switch(info->params.mode) {
4628 case MGSL_MODE_MONOSYNC:
4629 case MGSL_MODE_BISYNC:
4630 /* ignore residue in byte synchronous modes */
4631 if (desc_residue(info->rbufs[i]))
4632 count--;
4633 break;
4634 }
4635 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4636 DBGINFO(("rx_get_buf size=%d\n", count));
4637 if (count)
4638 ldisc_receive_buf(info->tty, info->rbufs[i].buf,
4639 info->flag_buf, count);
4640 free_rbufs(info, i, i);
4641 return 1;
4642 }
4643
4644 static void reset_tbufs(struct slgt_info *info)
4645 {
4646 unsigned int i;
4647 info->tbuf_current = 0;
4648 for (i=0 ; i < info->tbuf_count ; i++) {
4649 info->tbufs[i].status = 0;
4650 info->tbufs[i].count = 0;
4651 }
4652 }
4653
4654 /*
4655 * return number of free transmit DMA buffers
4656 */
4657 static unsigned int free_tbuf_count(struct slgt_info *info)
4658 {
4659 unsigned int count = 0;
4660 unsigned int i = info->tbuf_current;
4661
4662 do
4663 {
4664 if (desc_count(info->tbufs[i]))
4665 break; /* buffer in use */
4666 ++count;
4667 if (++i == info->tbuf_count)
4668 i=0;
4669 } while (i != info->tbuf_current);
4670
4671 /* if tx DMA active, last zero count buffer is in use */
4672 if (count && (rd_reg32(info, TDCSR) & BIT0))
4673 --count;
4674
4675 return count;
4676 }
4677
4678 /*
4679 * load transmit DMA buffer(s) with data
4680 */
4681 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4682 {
4683 unsigned short count;
4684 unsigned int i;
4685 struct slgt_desc *d;
4686
4687 if (size == 0)
4688 return;
4689
4690 DBGDATA(info, buf, size, "tx");
4691
4692 info->tbuf_start = i = info->tbuf_current;
4693
4694 while (size) {
4695 d = &info->tbufs[i];
4696 if (++i == info->tbuf_count)
4697 i = 0;
4698
4699 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4700 memcpy(d->buf, buf, count);
4701
4702 size -= count;
4703 buf += count;
4704
4705 /*
4706 * set EOF bit for last buffer of HDLC frame or
4707 * for every buffer in raw mode
4708 */
4709 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4710 info->params.mode == MGSL_MODE_RAW)
4711 set_desc_eof(*d, 1);
4712 else
4713 set_desc_eof(*d, 0);
4714
4715 set_desc_count(*d, count);
4716 }
4717
4718 info->tbuf_current = i;
4719 }
4720
4721 static int register_test(struct slgt_info *info)
4722 {
4723 static unsigned short patterns[] =
4724 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4725 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4726 unsigned int i;
4727 int rc = 0;
4728
4729 for (i=0 ; i < count ; i++) {
4730 wr_reg16(info, TIR, patterns[i]);
4731 wr_reg16(info, BDR, patterns[(i+1)%count]);
4732 if ((rd_reg16(info, TIR) != patterns[i]) ||
4733 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4734 rc = -ENODEV;
4735 break;
4736 }
4737 }
4738 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4739 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4740 return rc;
4741 }
4742
4743 static int irq_test(struct slgt_info *info)
4744 {
4745 unsigned long timeout;
4746 unsigned long flags;
4747 struct tty_struct *oldtty = info->tty;
4748 u32 speed = info->params.data_rate;
4749
4750 info->params.data_rate = 921600;
4751 info->tty = NULL;
4752
4753 spin_lock_irqsave(&info->lock, flags);
4754 async_mode(info);
4755 slgt_irq_on(info, IRQ_TXIDLE);
4756
4757 /* enable transmitter */
4758 wr_reg16(info, TCR,
4759 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4760
4761 /* write one byte and wait for tx idle */
4762 wr_reg16(info, TDR, 0);
4763
4764 /* assume failure */
4765 info->init_error = DiagStatus_IrqFailure;
4766 info->irq_occurred = FALSE;
4767
4768 spin_unlock_irqrestore(&info->lock, flags);
4769
4770 timeout=100;
4771 while(timeout-- && !info->irq_occurred)
4772 msleep_interruptible(10);
4773
4774 spin_lock_irqsave(&info->lock,flags);
4775 reset_port(info);
4776 spin_unlock_irqrestore(&info->lock,flags);
4777
4778 info->params.data_rate = speed;
4779 info->tty = oldtty;
4780
4781 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4782 return info->irq_occurred ? 0 : -ENODEV;
4783 }
4784
4785 static int loopback_test_rx(struct slgt_info *info)
4786 {
4787 unsigned char *src, *dest;
4788 int count;
4789
4790 if (desc_complete(info->rbufs[0])) {
4791 count = desc_count(info->rbufs[0]);
4792 src = info->rbufs[0].buf;
4793 dest = info->tmp_rbuf;
4794
4795 for( ; count ; count-=2, src+=2) {
4796 /* src=data byte (src+1)=status byte */
4797 if (!(*(src+1) & (BIT9 + BIT8))) {
4798 *dest = *src;
4799 dest++;
4800 info->tmp_rbuf_count++;
4801 }
4802 }
4803 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4804 return 1;
4805 }
4806 return 0;
4807 }
4808
4809 static int loopback_test(struct slgt_info *info)
4810 {
4811 #define TESTFRAMESIZE 20
4812
4813 unsigned long timeout;
4814 u16 count = TESTFRAMESIZE;
4815 unsigned char buf[TESTFRAMESIZE];
4816 int rc = -ENODEV;
4817 unsigned long flags;
4818
4819 struct tty_struct *oldtty = info->tty;
4820 MGSL_PARAMS params;
4821
4822 memcpy(&params, &info->params, sizeof(params));
4823
4824 info->params.mode = MGSL_MODE_ASYNC;
4825 info->params.data_rate = 921600;
4826 info->params.loopback = 1;
4827 info->tty = NULL;
4828
4829 /* build and send transmit frame */
4830 for (count = 0; count < TESTFRAMESIZE; ++count)
4831 buf[count] = (unsigned char)count;
4832
4833 info->tmp_rbuf_count = 0;
4834 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4835
4836 /* program hardware for HDLC and enabled receiver */
4837 spin_lock_irqsave(&info->lock,flags);
4838 async_mode(info);
4839 rx_start(info);
4840 info->tx_count = count;
4841 tx_load(info, buf, count);
4842 tx_start(info);
4843 spin_unlock_irqrestore(&info->lock, flags);
4844
4845 /* wait for receive complete */
4846 for (timeout = 100; timeout; --timeout) {
4847 msleep_interruptible(10);
4848 if (loopback_test_rx(info)) {
4849 rc = 0;
4850 break;
4851 }
4852 }
4853
4854 /* verify received frame length and contents */
4855 if (!rc && (info->tmp_rbuf_count != count ||
4856 memcmp(buf, info->tmp_rbuf, count))) {
4857 rc = -ENODEV;
4858 }
4859
4860 spin_lock_irqsave(&info->lock,flags);
4861 reset_adapter(info);
4862 spin_unlock_irqrestore(&info->lock,flags);
4863
4864 memcpy(&info->params, &params, sizeof(info->params));
4865 info->tty = oldtty;
4866
4867 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4868 return rc;
4869 }
4870
4871 static int adapter_test(struct slgt_info *info)
4872 {
4873 DBGINFO(("testing %s\n", info->device_name));
4874 if (register_test(info) < 0) {
4875 printk("register test failure %s addr=%08X\n",
4876 info->device_name, info->phys_reg_addr);
4877 } else if (irq_test(info) < 0) {
4878 printk("IRQ test failure %s IRQ=%d\n",
4879 info->device_name, info->irq_level);
4880 } else if (loopback_test(info) < 0) {
4881 printk("loopback test failure %s\n", info->device_name);
4882 }
4883 return info->init_error;
4884 }
4885
4886 /*
4887 * transmit timeout handler
4888 */
4889 static void tx_timeout(unsigned long context)
4890 {
4891 struct slgt_info *info = (struct slgt_info*)context;
4892 unsigned long flags;
4893
4894 DBGINFO(("%s tx_timeout\n", info->device_name));
4895 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4896 info->icount.txtimeout++;
4897 }
4898 spin_lock_irqsave(&info->lock,flags);
4899 info->tx_active = 0;
4900 info->tx_count = 0;
4901 spin_unlock_irqrestore(&info->lock,flags);
4902
4903 #if SYNCLINK_GENERIC_HDLC
4904 if (info->netcount)
4905 hdlcdev_tx_done(info);
4906 else
4907 #endif
4908 bh_transmit(info);
4909 }
4910
4911 /*
4912 * receive buffer polling timer
4913 */
4914 static void rx_timeout(unsigned long context)
4915 {
4916 struct slgt_info *info = (struct slgt_info*)context;
4917 unsigned long flags;
4918
4919 DBGINFO(("%s rx_timeout\n", info->device_name));
4920 spin_lock_irqsave(&info->lock, flags);
4921 info->pending_bh |= BH_RECEIVE;
4922 spin_unlock_irqrestore(&info->lock, flags);
4923 bh_handler(&info->task);
4924 }
4925
Support for the Chinese Samsung S3C2440 based development boards