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usbfs: simplify the lookup-by-minor routines
[linux-2.6/mini2440.git] / drivers / char / synclink_gt.c
blob2c3e43bb2cc933184ea94cc6abd04a1b82c6b312
1 /*
2 * $Id: synclink_gt.c,v 4.50 2007/07/25 19:29:25 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink GT serial adapters.
5 *
6 * written by Paul Fulghum for Microgate Corporation
7 * paulkf@microgate.com
8 *
9 * Microgate and SyncLink are trademarks of Microgate Corporation
10 *
11 * This code is released under the GNU General Public License (GPL)
12 *
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23 * OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 /*
27 * DEBUG OUTPUT DEFINITIONS
28 *
29 * uncomment lines below to enable specific types of debug output
30 *
31 * DBGINFO information - most verbose output
32 * DBGERR serious errors
33 * DBGBH bottom half service routine debugging
34 * DBGISR interrupt service routine debugging
35 * DBGDATA output receive and transmit data
36 * DBGTBUF output transmit DMA buffers and registers
37 * DBGRBUF output receive DMA buffers and registers
38 */
39
40 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45 //#define DBGTBUF(info) dump_tbufs(info)
46 //#define DBGRBUF(info) dump_rbufs(info)
47
48
49 #include <linux/module.h>
50 #include <linux/version.h>
51 #include <linux/errno.h>
52 #include <linux/signal.h>
53 #include <linux/sched.h>
54 #include <linux/timer.h>
55 #include <linux/interrupt.h>
56 #include <linux/pci.h>
57 #include <linux/tty.h>
58 #include <linux/tty_flip.h>
59 #include <linux/serial.h>
60 #include <linux/major.h>
61 #include <linux/string.h>
62 #include <linux/fcntl.h>
63 #include <linux/ptrace.h>
64 #include <linux/ioport.h>
65 #include <linux/mm.h>
66 #include <linux/slab.h>
67 #include <linux/netdevice.h>
68 #include <linux/vmalloc.h>
69 #include <linux/init.h>
70 #include <linux/delay.h>
71 #include <linux/ioctl.h>
72 #include <linux/termios.h>
73 #include <linux/bitops.h>
74 #include <linux/workqueue.h>
75 #include <linux/hdlc.h>
76 #include <linux/synclink.h>
77
78 #include <asm/system.h>
79 #include <asm/io.h>
80 #include <asm/irq.h>
81 #include <asm/dma.h>
82 #include <asm/types.h>
83 #include <asm/uaccess.h>
84
85 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
86 #define SYNCLINK_GENERIC_HDLC 1
87 #else
88 #define SYNCLINK_GENERIC_HDLC 0
89 #endif
90
91 /*
92 * module identification
93 */
94 static char *driver_name = "SyncLink GT";
95 static char *driver_version = "$Revision: 4.50 $";
96 static char *tty_driver_name = "synclink_gt";
97 static char *tty_dev_prefix = "ttySLG";
98 MODULE_LICENSE("GPL");
99 #define MGSL_MAGIC 0x5401
100 #define MAX_DEVICES 32
101
102 static struct pci_device_id pci_table[] = {
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
105 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107 {0,}, /* terminate list */
108 };
109 MODULE_DEVICE_TABLE(pci, pci_table);
110
111 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
112 static void remove_one(struct pci_dev *dev);
113 static struct pci_driver pci_driver = {
114 .name = "synclink_gt",
115 .id_table = pci_table,
116 .probe = init_one,
117 .remove = __devexit_p(remove_one),
118 };
119
120 static bool pci_registered;
121
122 /*
123 * module configuration and status
124 */
125 static struct slgt_info *slgt_device_list;
126 static int slgt_device_count;
127
128 static int ttymajor;
129 static int debug_level;
130 static int maxframe[MAX_DEVICES];
131 static int dosyncppp[MAX_DEVICES];
132
133 module_param(ttymajor, int, 0);
134 module_param(debug_level, int, 0);
135 module_param_array(maxframe, int, NULL, 0);
136 module_param_array(dosyncppp, int, NULL, 0);
137
138 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
139 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
140 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
141 MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
142
143 /*
144 * tty support and callbacks
145 */
146 static struct tty_driver *serial_driver;
147
148 static int open(struct tty_struct *tty, struct file * filp);
149 static void close(struct tty_struct *tty, struct file * filp);
150 static void hangup(struct tty_struct *tty);
151 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
152
153 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
154 static int put_char(struct tty_struct *tty, unsigned char ch);
155 static void send_xchar(struct tty_struct *tty, char ch);
156 static void wait_until_sent(struct tty_struct *tty, int timeout);
157 static int write_room(struct tty_struct *tty);
158 static void flush_chars(struct tty_struct *tty);
159 static void flush_buffer(struct tty_struct *tty);
160 static void tx_hold(struct tty_struct *tty);
161 static void tx_release(struct tty_struct *tty);
162
163 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
164 static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
165 static int chars_in_buffer(struct tty_struct *tty);
166 static void throttle(struct tty_struct * tty);
167 static void unthrottle(struct tty_struct * tty);
168 static 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 struct tty_port port;
248
249 struct slgt_info *next_device; /* device list link */
250
251 int magic;
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 line; /* tty line instance number */
264
265 struct mgsl_icount icount;
266
267 int timeout;
268 int x_char; /* xon/xoff character */
269 unsigned int read_status_mask;
270 unsigned int ignore_status_mask;
271
272 wait_queue_head_t status_event_wait_q;
273 wait_queue_head_t event_wait_q;
274 struct timer_list tx_timer;
275 struct timer_list rx_timer;
276
277 unsigned int gpio_present;
278 struct cond_wait *gpio_wait_q;
279
280 spinlock_t lock; /* spinlock for synchronizing with ISR */
281
282 struct work_struct task;
283 u32 pending_bh;
284 bool bh_requested;
285 bool bh_running;
286
287 int isr_overflow;
288 bool irq_requested; /* true if IRQ requested */
289 bool irq_occurred; /* for diagnostics use */
290
291 /* device configuration */
292
293 unsigned int bus_type;
294 unsigned int irq_level;
295 unsigned long irq_flags;
296
297 unsigned char __iomem * reg_addr; /* memory mapped registers address */
298 u32 phys_reg_addr;
299 bool reg_addr_requested;
300
301 MGSL_PARAMS params; /* communications parameters */
302 u32 idle_mode;
303 u32 max_frame_size; /* as set by device config */
304
305 unsigned int raw_rx_size;
306 unsigned int if_mode;
307
308 /* device status */
309
310 bool rx_enabled;
311 bool rx_restart;
312
313 bool tx_enabled;
314 bool tx_active;
315
316 unsigned char signals; /* serial signal states */
317 int init_error; /* initialization error */
318
319 unsigned char *tx_buf;
320 int tx_count;
321
322 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
323 char char_buf[MAX_ASYNC_BUFFER_SIZE];
324 bool drop_rts_on_tx_done;
325 struct _input_signal_events input_signal_events;
326
327 int dcd_chkcount; /* check counts to prevent */
328 int cts_chkcount; /* too many IRQs if a signal */
329 int dsr_chkcount; /* is floating */
330 int ri_chkcount;
331
332 char *bufs; /* virtual address of DMA buffer lists */
333 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
334
335 unsigned int rbuf_count;
336 struct slgt_desc *rbufs;
337 unsigned int rbuf_current;
338 unsigned int rbuf_index;
339
340 unsigned int tbuf_count;
341 struct slgt_desc *tbufs;
342 unsigned int tbuf_current;
343 unsigned int tbuf_start;
344
345 unsigned char *tmp_rbuf;
346 unsigned int tmp_rbuf_count;
347
348 /* SPPP/Cisco HDLC device parts */
349
350 int netcount;
351 int dosyncppp;
352 spinlock_t netlock;
353 #if SYNCLINK_GENERIC_HDLC
354 struct net_device *netdev;
355 #endif
356
357 };
358
359 static MGSL_PARAMS default_params = {
360 .mode = MGSL_MODE_HDLC,
361 .loopback = 0,
362 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
363 .encoding = HDLC_ENCODING_NRZI_SPACE,
364 .clock_speed = 0,
365 .addr_filter = 0xff,
366 .crc_type = HDLC_CRC_16_CCITT,
367 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
368 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
369 .data_rate = 9600,
370 .data_bits = 8,
371 .stop_bits = 1,
372 .parity = ASYNC_PARITY_NONE
373 };
374
375
376 #define BH_RECEIVE 1
377 #define BH_TRANSMIT 2
378 #define BH_STATUS 4
379 #define IO_PIN_SHUTDOWN_LIMIT 100
380
381 #define DMABUFSIZE 256
382 #define DESC_LIST_SIZE 4096
383
384 #define MASK_PARITY BIT1
385 #define MASK_FRAMING BIT0
386 #define MASK_BREAK BIT14
387 #define MASK_OVERRUN BIT4
388
389 #define GSR 0x00 /* global status */
390 #define JCR 0x04 /* JTAG control */
391 #define IODR 0x08 /* GPIO direction */
392 #define IOER 0x0c /* GPIO interrupt enable */
393 #define IOVR 0x10 /* GPIO value */
394 #define IOSR 0x14 /* GPIO interrupt status */
395 #define TDR 0x80 /* tx data */
396 #define RDR 0x80 /* rx data */
397 #define TCR 0x82 /* tx control */
398 #define TIR 0x84 /* tx idle */
399 #define TPR 0x85 /* tx preamble */
400 #define RCR 0x86 /* rx control */
401 #define VCR 0x88 /* V.24 control */
402 #define CCR 0x89 /* clock control */
403 #define BDR 0x8a /* baud divisor */
404 #define SCR 0x8c /* serial control */
405 #define SSR 0x8e /* serial status */
406 #define RDCSR 0x90 /* rx DMA control/status */
407 #define TDCSR 0x94 /* tx DMA control/status */
408 #define RDDAR 0x98 /* rx DMA descriptor address */
409 #define TDDAR 0x9c /* tx DMA descriptor address */
410
411 #define RXIDLE BIT14
412 #define RXBREAK BIT14
413 #define IRQ_TXDATA BIT13
414 #define IRQ_TXIDLE BIT12
415 #define IRQ_TXUNDER BIT11 /* HDLC */
416 #define IRQ_RXDATA BIT10
417 #define IRQ_RXIDLE BIT9 /* HDLC */
418 #define IRQ_RXBREAK BIT9 /* async */
419 #define IRQ_RXOVER BIT8
420 #define IRQ_DSR BIT7
421 #define IRQ_CTS BIT6
422 #define IRQ_DCD BIT5
423 #define IRQ_RI BIT4
424 #define IRQ_ALL 0x3ff0
425 #define IRQ_MASTER BIT0
426
427 #define slgt_irq_on(info, mask) \
428 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
429 #define slgt_irq_off(info, mask) \
430 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
431
432 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
433 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
434 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
435 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
436 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
437 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
438
439 static void msc_set_vcr(struct slgt_info *info);
440
441 static int startup(struct slgt_info *info);
442 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
443 static void shutdown(struct slgt_info *info);
444 static void program_hw(struct slgt_info *info);
445 static void change_params(struct slgt_info *info);
446
447 static int register_test(struct slgt_info *info);
448 static int irq_test(struct slgt_info *info);
449 static int loopback_test(struct slgt_info *info);
450 static int adapter_test(struct slgt_info *info);
451
452 static void reset_adapter(struct slgt_info *info);
453 static void reset_port(struct slgt_info *info);
454 static void async_mode(struct slgt_info *info);
455 static void sync_mode(struct slgt_info *info);
456
457 static void rx_stop(struct slgt_info *info);
458 static void rx_start(struct slgt_info *info);
459 static void reset_rbufs(struct slgt_info *info);
460 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
461 static void rdma_reset(struct slgt_info *info);
462 static bool rx_get_frame(struct slgt_info *info);
463 static bool rx_get_buf(struct slgt_info *info);
464
465 static void tx_start(struct slgt_info *info);
466 static void tx_stop(struct slgt_info *info);
467 static void tx_set_idle(struct slgt_info *info);
468 static unsigned int free_tbuf_count(struct slgt_info *info);
469 static void reset_tbufs(struct slgt_info *info);
470 static void tdma_reset(struct slgt_info *info);
471 static void tdma_start(struct slgt_info *info);
472 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
473
474 static void get_signals(struct slgt_info *info);
475 static void set_signals(struct slgt_info *info);
476 static void enable_loopback(struct slgt_info *info);
477 static void set_rate(struct slgt_info *info, u32 data_rate);
478
479 static int bh_action(struct slgt_info *info);
480 static void bh_handler(struct work_struct *work);
481 static void bh_transmit(struct slgt_info *info);
482 static void isr_serial(struct slgt_info *info);
483 static void isr_rdma(struct slgt_info *info);
484 static void isr_txeom(struct slgt_info *info, unsigned short status);
485 static void isr_tdma(struct slgt_info *info);
486
487 static int alloc_dma_bufs(struct slgt_info *info);
488 static void free_dma_bufs(struct slgt_info *info);
489 static int alloc_desc(struct slgt_info *info);
490 static void free_desc(struct slgt_info *info);
491 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
493
494 static int alloc_tmp_rbuf(struct slgt_info *info);
495 static void free_tmp_rbuf(struct slgt_info *info);
496
497 static void tx_timeout(unsigned long context);
498 static void rx_timeout(unsigned long context);
499
500 /*
501 * ioctl handlers
502 */
503 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
504 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
506 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
507 static int set_txidle(struct slgt_info *info, int idle_mode);
508 static int tx_enable(struct slgt_info *info, int enable);
509 static int tx_abort(struct slgt_info *info);
510 static int rx_enable(struct slgt_info *info, int enable);
511 static int modem_input_wait(struct slgt_info *info,int arg);
512 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
513 static int tiocmget(struct tty_struct *tty, struct file *file);
514 static int tiocmset(struct tty_struct *tty, struct file *file,
515 unsigned int set, unsigned int clear);
516 static void set_break(struct tty_struct *tty, int break_state);
517 static int get_interface(struct slgt_info *info, int __user *if_mode);
518 static int set_interface(struct slgt_info *info, int if_mode);
519 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522
523 /*
524 * driver functions
525 */
526 static void add_device(struct slgt_info *info);
527 static void device_init(int adapter_num, struct pci_dev *pdev);
528 static int claim_resources(struct slgt_info *info);
529 static void release_resources(struct slgt_info *info);
530
531 /*
532 * DEBUG OUTPUT CODE
533 */
534 #ifndef DBGINFO
535 #define DBGINFO(fmt)
536 #endif
537 #ifndef DBGERR
538 #define DBGERR(fmt)
539 #endif
540 #ifndef DBGBH
541 #define DBGBH(fmt)
542 #endif
543 #ifndef DBGISR
544 #define DBGISR(fmt)
545 #endif
546
547 #ifdef DBGDATA
548 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
549 {
550 int i;
551 int linecount;
552 printk("%s %s data:\n",info->device_name, label);
553 while(count) {
554 linecount = (count > 16) ? 16 : count;
555 for(i=0; i < linecount; i++)
556 printk("%02X ",(unsigned char)data[i]);
557 for(;i<17;i++)
558 printk(" ");
559 for(i=0;i<linecount;i++) {
560 if (data[i]>=040 && data[i]<=0176)
561 printk("%c",data[i]);
562 else
563 printk(".");
564 }
565 printk("\n");
566 data += linecount;
567 count -= linecount;
568 }
569 }
570 #else
571 #define DBGDATA(info, buf, size, label)
572 #endif
573
574 #ifdef DBGTBUF
575 static void dump_tbufs(struct slgt_info *info)
576 {
577 int i;
578 printk("tbuf_current=%d\n", info->tbuf_current);
579 for (i=0 ; i < info->tbuf_count ; i++) {
580 printk("%d: count=%04X status=%04X\n",
581 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
582 }
583 }
584 #else
585 #define DBGTBUF(info)
586 #endif
587
588 #ifdef DBGRBUF
589 static void dump_rbufs(struct slgt_info *info)
590 {
591 int i;
592 printk("rbuf_current=%d\n", info->rbuf_current);
593 for (i=0 ; i < info->rbuf_count ; i++) {
594 printk("%d: count=%04X status=%04X\n",
595 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
596 }
597 }
598 #else
599 #define DBGRBUF(info)
600 #endif
601
602 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
603 {
604 #ifdef SANITY_CHECK
605 if (!info) {
606 printk("null struct slgt_info for (%s) in %s\n", devname, name);
607 return 1;
608 }
609 if (info->magic != MGSL_MAGIC) {
610 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
611 return 1;
612 }
613 #else
614 if (!info)
615 return 1;
616 #endif
617 return 0;
618 }
619
620 /**
621 * line discipline callback wrappers
622 *
623 * The wrappers maintain line discipline references
624 * while calling into the line discipline.
625 *
626 * ldisc_receive_buf - pass receive data to line discipline
627 */
628 static void ldisc_receive_buf(struct tty_struct *tty,
629 const __u8 *data, char *flags, int count)
630 {
631 struct tty_ldisc *ld;
632 if (!tty)
633 return;
634 ld = tty_ldisc_ref(tty);
635 if (ld) {
636 if (ld->ops->receive_buf)
637 ld->ops->receive_buf(tty, data, flags, count);
638 tty_ldisc_deref(ld);
639 }
640 }
641
642 /* tty callbacks */
643
644 static int open(struct tty_struct *tty, struct file *filp)
645 {
646 struct slgt_info *info;
647 int retval, line;
648 unsigned long flags;
649
650 line = tty->index;
651 if ((line < 0) || (line >= slgt_device_count)) {
652 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
653 return -ENODEV;
654 }
655
656 info = slgt_device_list;
657 while(info && info->line != line)
658 info = info->next_device;
659 if (sanity_check(info, tty->name, "open"))
660 return -ENODEV;
661 if (info->init_error) {
662 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
663 return -ENODEV;
664 }
665
666 tty->driver_data = info;
667 info->port.tty = tty;
668
669 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
670
671 /* If port is closing, signal caller to try again */
672 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
673 if (info->port.flags & ASYNC_CLOSING)
674 interruptible_sleep_on(&info->port.close_wait);
675 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
676 -EAGAIN : -ERESTARTSYS);
677 goto cleanup;
678 }
679
680 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
681
682 spin_lock_irqsave(&info->netlock, flags);
683 if (info->netcount) {
684 retval = -EBUSY;
685 spin_unlock_irqrestore(&info->netlock, flags);
686 goto cleanup;
687 }
688 info->port.count++;
689 spin_unlock_irqrestore(&info->netlock, flags);
690
691 if (info->port.count == 1) {
692 /* 1st open on this device, init hardware */
693 retval = startup(info);
694 if (retval < 0)
695 goto cleanup;
696 }
697
698 retval = block_til_ready(tty, filp, info);
699 if (retval) {
700 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
701 goto cleanup;
702 }
703
704 retval = 0;
705
706 cleanup:
707 if (retval) {
708 if (tty->count == 1)
709 info->port.tty = NULL; /* tty layer will release tty struct */
710 if(info->port.count)
711 info->port.count--;
712 }
713
714 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
715 return retval;
716 }
717
718 static void close(struct tty_struct *tty, struct file *filp)
719 {
720 struct slgt_info *info = tty->driver_data;
721
722 if (sanity_check(info, tty->name, "close"))
723 return;
724 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
725
726 if (!info->port.count)
727 return;
728
729 if (tty_hung_up_p(filp))
730 goto cleanup;
731
732 if ((tty->count == 1) && (info->port.count != 1)) {
733 /*
734 * tty->count is 1 and the tty structure will be freed.
735 * info->port.count should be one in this case.
736 * if it's not, correct it so that the port is shutdown.
737 */
738 DBGERR(("%s close: bad refcount; tty->count=1, "
739 "info->port.count=%d\n", info->device_name, info->port.count));
740 info->port.count = 1;
741 }
742
743 info->port.count--;
744
745 /* if at least one open remaining, leave hardware active */
746 if (info->port.count)
747 goto cleanup;
748
749 info->port.flags |= ASYNC_CLOSING;
750
751 /* set tty->closing to notify line discipline to
752 * only process XON/XOFF characters. Only the N_TTY
753 * discipline appears to use this (ppp does not).
754 */
755 tty->closing = 1;
756
757 /* wait for transmit data to clear all layers */
758
759 if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
760 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
761 tty_wait_until_sent(tty, info->port.closing_wait);
762 }
763
764 if (info->port.flags & ASYNC_INITIALIZED)
765 wait_until_sent(tty, info->timeout);
766 flush_buffer(tty);
767 tty_ldisc_flush(tty);
768
769 shutdown(info);
770
771 tty->closing = 0;
772 info->port.tty = NULL;
773
774 if (info->port.blocked_open) {
775 if (info->port.close_delay) {
776 msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
777 }
778 wake_up_interruptible(&info->port.open_wait);
779 }
780
781 info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
782
783 wake_up_interruptible(&info->port.close_wait);
784
785 cleanup:
786 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
787 }
788
789 static void hangup(struct tty_struct *tty)
790 {
791 struct slgt_info *info = tty->driver_data;
792
793 if (sanity_check(info, tty->name, "hangup"))
794 return;
795 DBGINFO(("%s hangup\n", info->device_name));
796
797 flush_buffer(tty);
798 shutdown(info);
799
800 info->port.count = 0;
801 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
802 info->port.tty = NULL;
803
804 wake_up_interruptible(&info->port.open_wait);
805 }
806
807 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
808 {
809 struct slgt_info *info = tty->driver_data;
810 unsigned long flags;
811
812 DBGINFO(("%s set_termios\n", tty->driver->name));
813
814 change_params(info);
815
816 /* Handle transition to B0 status */
817 if (old_termios->c_cflag & CBAUD &&
818 !(tty->termios->c_cflag & CBAUD)) {
819 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
820 spin_lock_irqsave(&info->lock,flags);
821 set_signals(info);
822 spin_unlock_irqrestore(&info->lock,flags);
823 }
824
825 /* Handle transition away from B0 status */
826 if (!(old_termios->c_cflag & CBAUD) &&
827 tty->termios->c_cflag & CBAUD) {
828 info->signals |= SerialSignal_DTR;
829 if (!(tty->termios->c_cflag & CRTSCTS) ||
830 !test_bit(TTY_THROTTLED, &tty->flags)) {
831 info->signals |= SerialSignal_RTS;
832 }
833 spin_lock_irqsave(&info->lock,flags);
834 set_signals(info);
835 spin_unlock_irqrestore(&info->lock,flags);
836 }
837
838 /* Handle turning off CRTSCTS */
839 if (old_termios->c_cflag & CRTSCTS &&
840 !(tty->termios->c_cflag & CRTSCTS)) {
841 tty->hw_stopped = 0;
842 tx_release(tty);
843 }
844 }
845
846 static int write(struct tty_struct *tty,
847 const unsigned char *buf, int count)
848 {
849 int ret = 0;
850 struct slgt_info *info = tty->driver_data;
851 unsigned long flags;
852
853 if (sanity_check(info, tty->name, "write"))
854 goto cleanup;
855 DBGINFO(("%s write count=%d\n", info->device_name, count));
856
857 if (!info->tx_buf)
858 goto cleanup;
859
860 if (count > info->max_frame_size) {
861 ret = -EIO;
862 goto cleanup;
863 }
864
865 if (!count)
866 goto cleanup;
867
868 if (info->params.mode == MGSL_MODE_RAW ||
869 info->params.mode == MGSL_MODE_MONOSYNC ||
870 info->params.mode == MGSL_MODE_BISYNC) {
871 unsigned int bufs_needed = (count/DMABUFSIZE);
872 unsigned int bufs_free = free_tbuf_count(info);
873 if (count % DMABUFSIZE)
874 ++bufs_needed;
875 if (bufs_needed > bufs_free)
876 goto cleanup;
877 } else {
878 if (info->tx_active)
879 goto cleanup;
880 if (info->tx_count) {
881 /* send accumulated data from send_char() calls */
882 /* as frame and wait before accepting more data. */
883 tx_load(info, info->tx_buf, info->tx_count);
884 goto start;
885 }
886 }
887
888 ret = info->tx_count = count;
889 tx_load(info, buf, count);
890 goto start;
891
892 start:
893 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
894 spin_lock_irqsave(&info->lock,flags);
895 if (!info->tx_active)
896 tx_start(info);
897 else
898 tdma_start(info);
899 spin_unlock_irqrestore(&info->lock,flags);
900 }
901
902 cleanup:
903 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
904 return ret;
905 }
906
907 static int put_char(struct tty_struct *tty, unsigned char ch)
908 {
909 struct slgt_info *info = tty->driver_data;
910 unsigned long flags;
911 int ret = 0;
912
913 if (sanity_check(info, tty->name, "put_char"))
914 return 0;
915 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
916 if (!info->tx_buf)
917 return 0;
918 spin_lock_irqsave(&info->lock,flags);
919 if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
920 info->tx_buf[info->tx_count++] = ch;
921 ret = 1;
922 }
923 spin_unlock_irqrestore(&info->lock,flags);
924 return ret;
925 }
926
927 static void send_xchar(struct tty_struct *tty, char ch)
928 {
929 struct slgt_info *info = tty->driver_data;
930 unsigned long flags;
931
932 if (sanity_check(info, tty->name, "send_xchar"))
933 return;
934 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
935 info->x_char = ch;
936 if (ch) {
937 spin_lock_irqsave(&info->lock,flags);
938 if (!info->tx_enabled)
939 tx_start(info);
940 spin_unlock_irqrestore(&info->lock,flags);
941 }
942 }
943
944 static void wait_until_sent(struct tty_struct *tty, int timeout)
945 {
946 struct slgt_info *info = tty->driver_data;
947 unsigned long orig_jiffies, char_time;
948
949 if (!info )
950 return;
951 if (sanity_check(info, tty->name, "wait_until_sent"))
952 return;
953 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
954 if (!(info->port.flags & ASYNC_INITIALIZED))
955 goto exit;
956
957 orig_jiffies = jiffies;
958
959 /* Set check interval to 1/5 of estimated time to
960 * send a character, and make it at least 1. The check
961 * interval should also be less than the timeout.
962 * Note: use tight timings here to satisfy the NIST-PCTS.
963 */
964
965 lock_kernel();
966
967 if (info->params.data_rate) {
968 char_time = info->timeout/(32 * 5);
969 if (!char_time)
970 char_time++;
971 } else
972 char_time = 1;
973
974 if (timeout)
975 char_time = min_t(unsigned long, char_time, timeout);
976
977 while (info->tx_active) {
978 msleep_interruptible(jiffies_to_msecs(char_time));
979 if (signal_pending(current))
980 break;
981 if (timeout && time_after(jiffies, orig_jiffies + timeout))
982 break;
983 }
984 unlock_kernel();
985
986 exit:
987 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
988 }
989
990 static int write_room(struct tty_struct *tty)
991 {
992 struct slgt_info *info = tty->driver_data;
993 int ret;
994
995 if (sanity_check(info, tty->name, "write_room"))
996 return 0;
997 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
998 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
999 return ret;
1000 }
1001
1002 static void flush_chars(struct tty_struct *tty)
1003 {
1004 struct slgt_info *info = tty->driver_data;
1005 unsigned long flags;
1006
1007 if (sanity_check(info, tty->name, "flush_chars"))
1008 return;
1009 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1010
1011 if (info->tx_count <= 0 || tty->stopped ||
1012 tty->hw_stopped || !info->tx_buf)
1013 return;
1014
1015 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1016
1017 spin_lock_irqsave(&info->lock,flags);
1018 if (!info->tx_active && info->tx_count) {
1019 tx_load(info, info->tx_buf,info->tx_count);
1020 tx_start(info);
1021 }
1022 spin_unlock_irqrestore(&info->lock,flags);
1023 }
1024
1025 static void flush_buffer(struct tty_struct *tty)
1026 {
1027 struct slgt_info *info = tty->driver_data;
1028 unsigned long flags;
1029
1030 if (sanity_check(info, tty->name, "flush_buffer"))
1031 return;
1032 DBGINFO(("%s flush_buffer\n", info->device_name));
1033
1034 spin_lock_irqsave(&info->lock,flags);
1035 if (!info->tx_active)
1036 info->tx_count = 0;
1037 spin_unlock_irqrestore(&info->lock,flags);
1038
1039 tty_wakeup(tty);
1040 }
1041
1042 /*
1043 * throttle (stop) transmitter
1044 */
1045 static void tx_hold(struct tty_struct *tty)
1046 {
1047 struct slgt_info *info = tty->driver_data;
1048 unsigned long flags;
1049
1050 if (sanity_check(info, tty->name, "tx_hold"))
1051 return;
1052 DBGINFO(("%s tx_hold\n", info->device_name));
1053 spin_lock_irqsave(&info->lock,flags);
1054 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1055 tx_stop(info);
1056 spin_unlock_irqrestore(&info->lock,flags);
1057 }
1058
1059 /*
1060 * release (start) transmitter
1061 */
1062 static void tx_release(struct tty_struct *tty)
1063 {
1064 struct slgt_info *info = tty->driver_data;
1065 unsigned long flags;
1066
1067 if (sanity_check(info, tty->name, "tx_release"))
1068 return;
1069 DBGINFO(("%s tx_release\n", info->device_name));
1070 spin_lock_irqsave(&info->lock,flags);
1071 if (!info->tx_active && info->tx_count) {
1072 tx_load(info, info->tx_buf, info->tx_count);
1073 tx_start(info);
1074 }
1075 spin_unlock_irqrestore(&info->lock,flags);
1076 }
1077
1078 /*
1079 * Service an IOCTL request
1080 *
1081 * Arguments
1082 *
1083 * tty pointer to tty instance data
1084 * file pointer to associated file object for device
1085 * cmd IOCTL command code
1086 * arg command argument/context
1087 *
1088 * Return 0 if success, otherwise error code
1089 */
1090 static int ioctl(struct tty_struct *tty, struct file *file,
1091 unsigned int cmd, unsigned long arg)
1092 {
1093 struct slgt_info *info = tty->driver_data;
1094 struct mgsl_icount cnow; /* kernel counter temps */
1095 struct serial_icounter_struct __user *p_cuser; /* user space */
1096 unsigned long flags;
1097 void __user *argp = (void __user *)arg;
1098 int ret;
1099
1100 if (sanity_check(info, tty->name, "ioctl"))
1101 return -ENODEV;
1102 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1103
1104 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1105 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1106 if (tty->flags & (1 << TTY_IO_ERROR))
1107 return -EIO;
1108 }
1109
1110 lock_kernel();
1111
1112 switch (cmd) {
1113 case MGSL_IOCGPARAMS:
1114 ret = get_params(info, argp);
1115 break;
1116 case MGSL_IOCSPARAMS:
1117 ret = set_params(info, argp);
1118 break;
1119 case MGSL_IOCGTXIDLE:
1120 ret = get_txidle(info, argp);
1121 break;
1122 case MGSL_IOCSTXIDLE:
1123 ret = set_txidle(info, (int)arg);
1124 break;
1125 case MGSL_IOCTXENABLE:
1126 ret = tx_enable(info, (int)arg);
1127 break;
1128 case MGSL_IOCRXENABLE:
1129 ret = rx_enable(info, (int)arg);
1130 break;
1131 case MGSL_IOCTXABORT:
1132 ret = tx_abort(info);
1133 break;
1134 case MGSL_IOCGSTATS:
1135 ret = get_stats(info, argp);
1136 break;
1137 case MGSL_IOCWAITEVENT:
1138 ret = wait_mgsl_event(info, argp);
1139 break;
1140 case TIOCMIWAIT:
1141 ret = modem_input_wait(info,(int)arg);
1142 break;
1143 case MGSL_IOCGIF:
1144 ret = get_interface(info, argp);
1145 break;
1146 case MGSL_IOCSIF:
1147 ret = set_interface(info,(int)arg);
1148 break;
1149 case MGSL_IOCSGPIO:
1150 ret = set_gpio(info, argp);
1151 break;
1152 case MGSL_IOCGGPIO:
1153 ret = get_gpio(info, argp);
1154 break;
1155 case MGSL_IOCWAITGPIO:
1156 ret = wait_gpio(info, argp);
1157 break;
1158 case TIOCGICOUNT:
1159 spin_lock_irqsave(&info->lock,flags);
1160 cnow = info->icount;
1161 spin_unlock_irqrestore(&info->lock,flags);
1162 p_cuser = argp;
1163 if (put_user(cnow.cts, &p_cuser->cts) ||
1164 put_user(cnow.dsr, &p_cuser->dsr) ||
1165 put_user(cnow.rng, &p_cuser->rng) ||
1166 put_user(cnow.dcd, &p_cuser->dcd) ||
1167 put_user(cnow.rx, &p_cuser->rx) ||
1168 put_user(cnow.tx, &p_cuser->tx) ||
1169 put_user(cnow.frame, &p_cuser->frame) ||
1170 put_user(cnow.overrun, &p_cuser->overrun) ||
1171 put_user(cnow.parity, &p_cuser->parity) ||
1172 put_user(cnow.brk, &p_cuser->brk) ||
1173 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1174 ret = -EFAULT;
1175 ret = 0;
1176 break;
1177 default:
1178 ret = -ENOIOCTLCMD;
1179 }
1180 unlock_kernel();
1181 return ret;
1182 }
1183
1184 /*
1185 * support for 32 bit ioctl calls on 64 bit systems
1186 */
1187 #ifdef CONFIG_COMPAT
1188 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1189 {
1190 struct MGSL_PARAMS32 tmp_params;
1191
1192 DBGINFO(("%s get_params32\n", info->device_name));
1193 tmp_params.mode = (compat_ulong_t)info->params.mode;
1194 tmp_params.loopback = info->params.loopback;
1195 tmp_params.flags = info->params.flags;
1196 tmp_params.encoding = info->params.encoding;
1197 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1198 tmp_params.addr_filter = info->params.addr_filter;
1199 tmp_params.crc_type = info->params.crc_type;
1200 tmp_params.preamble_length = info->params.preamble_length;
1201 tmp_params.preamble = info->params.preamble;
1202 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1203 tmp_params.data_bits = info->params.data_bits;
1204 tmp_params.stop_bits = info->params.stop_bits;
1205 tmp_params.parity = info->params.parity;
1206 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1207 return -EFAULT;
1208 return 0;
1209 }
1210
1211 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1212 {
1213 struct MGSL_PARAMS32 tmp_params;
1214
1215 DBGINFO(("%s set_params32\n", info->device_name));
1216 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1217 return -EFAULT;
1218
1219 spin_lock(&info->lock);
1220 info->params.mode = tmp_params.mode;
1221 info->params.loopback = tmp_params.loopback;
1222 info->params.flags = tmp_params.flags;
1223 info->params.encoding = tmp_params.encoding;
1224 info->params.clock_speed = tmp_params.clock_speed;
1225 info->params.addr_filter = tmp_params.addr_filter;
1226 info->params.crc_type = tmp_params.crc_type;
1227 info->params.preamble_length = tmp_params.preamble_length;
1228 info->params.preamble = tmp_params.preamble;
1229 info->params.data_rate = tmp_params.data_rate;
1230 info->params.data_bits = tmp_params.data_bits;
1231 info->params.stop_bits = tmp_params.stop_bits;
1232 info->params.parity = tmp_params.parity;
1233 spin_unlock(&info->lock);
1234
1235 change_params(info);
1236
1237 return 0;
1238 }
1239
1240 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1241 unsigned int cmd, unsigned long arg)
1242 {
1243 struct slgt_info *info = tty->driver_data;
1244 int rc = -ENOIOCTLCMD;
1245
1246 if (sanity_check(info, tty->name, "compat_ioctl"))
1247 return -ENODEV;
1248 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1249
1250 switch (cmd) {
1251
1252 case MGSL_IOCSPARAMS32:
1253 rc = set_params32(info, compat_ptr(arg));
1254 break;
1255
1256 case MGSL_IOCGPARAMS32:
1257 rc = get_params32(info, compat_ptr(arg));
1258 break;
1259
1260 case MGSL_IOCGPARAMS:
1261 case MGSL_IOCSPARAMS:
1262 case MGSL_IOCGTXIDLE:
1263 case MGSL_IOCGSTATS:
1264 case MGSL_IOCWAITEVENT:
1265 case MGSL_IOCGIF:
1266 case MGSL_IOCSGPIO:
1267 case MGSL_IOCGGPIO:
1268 case MGSL_IOCWAITGPIO:
1269 case TIOCGICOUNT:
1270 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1271 break;
1272
1273 case MGSL_IOCSTXIDLE:
1274 case MGSL_IOCTXENABLE:
1275 case MGSL_IOCRXENABLE:
1276 case MGSL_IOCTXABORT:
1277 case TIOCMIWAIT:
1278 case MGSL_IOCSIF:
1279 rc = ioctl(tty, file, cmd, arg);
1280 break;
1281 }
1282
1283 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1284 return rc;
1285 }
1286 #else
1287 #define slgt_compat_ioctl NULL
1288 #endif /* ifdef CONFIG_COMPAT */
1289
1290 /*
1291 * proc fs support
1292 */
1293 static inline int line_info(char *buf, struct slgt_info *info)
1294 {
1295 char stat_buf[30];
1296 int ret;
1297 unsigned long flags;
1298
1299 ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1300 info->device_name, info->phys_reg_addr,
1301 info->irq_level, info->max_frame_size);
1302
1303 /* output current serial signal states */
1304 spin_lock_irqsave(&info->lock,flags);
1305 get_signals(info);
1306 spin_unlock_irqrestore(&info->lock,flags);
1307
1308 stat_buf[0] = 0;
1309 stat_buf[1] = 0;
1310 if (info->signals & SerialSignal_RTS)
1311 strcat(stat_buf, "|RTS");
1312 if (info->signals & SerialSignal_CTS)
1313 strcat(stat_buf, "|CTS");
1314 if (info->signals & SerialSignal_DTR)
1315 strcat(stat_buf, "|DTR");
1316 if (info->signals & SerialSignal_DSR)
1317 strcat(stat_buf, "|DSR");
1318 if (info->signals & SerialSignal_DCD)
1319 strcat(stat_buf, "|CD");
1320 if (info->signals & SerialSignal_RI)
1321 strcat(stat_buf, "|RI");
1322
1323 if (info->params.mode != MGSL_MODE_ASYNC) {
1324 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1325 info->icount.txok, info->icount.rxok);
1326 if (info->icount.txunder)
1327 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1328 if (info->icount.txabort)
1329 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1330 if (info->icount.rxshort)
1331 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1332 if (info->icount.rxlong)
1333 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1334 if (info->icount.rxover)
1335 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1336 if (info->icount.rxcrc)
1337 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1338 } else {
1339 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1340 info->icount.tx, info->icount.rx);
1341 if (info->icount.frame)
1342 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1343 if (info->icount.parity)
1344 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1345 if (info->icount.brk)
1346 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1347 if (info->icount.overrun)
1348 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1349 }
1350
1351 /* Append serial signal status to end */
1352 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1353
1354 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1355 info->tx_active,info->bh_requested,info->bh_running,
1356 info->pending_bh);
1357
1358 return ret;
1359 }
1360
1361 /* Called to print information about devices
1362 */
1363 static int read_proc(char *page, char **start, off_t off, int count,
1364 int *eof, void *data)
1365 {
1366 int len = 0, l;
1367 off_t begin = 0;
1368 struct slgt_info *info;
1369
1370 len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1371
1372 info = slgt_device_list;
1373 while( info ) {
1374 l = line_info(page + len, info);
1375 len += l;
1376 if (len+begin > off+count)
1377 goto done;
1378 if (len+begin < off) {
1379 begin += len;
1380 len = 0;
1381 }
1382 info = info->next_device;
1383 }
1384
1385 *eof = 1;
1386 done:
1387 if (off >= len+begin)
1388 return 0;
1389 *start = page + (off-begin);
1390 return ((count < begin+len-off) ? count : begin+len-off);
1391 }
1392
1393 /*
1394 * return count of bytes in transmit buffer
1395 */
1396 static int chars_in_buffer(struct tty_struct *tty)
1397 {
1398 struct slgt_info *info = tty->driver_data;
1399 if (sanity_check(info, tty->name, "chars_in_buffer"))
1400 return 0;
1401 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1402 return info->tx_count;
1403 }
1404
1405 /*
1406 * signal remote device to throttle send data (our receive data)
1407 */
1408 static void throttle(struct tty_struct * tty)
1409 {
1410 struct slgt_info *info = tty->driver_data;
1411 unsigned long flags;
1412
1413 if (sanity_check(info, tty->name, "throttle"))
1414 return;
1415 DBGINFO(("%s throttle\n", info->device_name));
1416 if (I_IXOFF(tty))
1417 send_xchar(tty, STOP_CHAR(tty));
1418 if (tty->termios->c_cflag & CRTSCTS) {
1419 spin_lock_irqsave(&info->lock,flags);
1420 info->signals &= ~SerialSignal_RTS;
1421 set_signals(info);
1422 spin_unlock_irqrestore(&info->lock,flags);
1423 }
1424 }
1425
1426 /*
1427 * signal remote device to stop throttling send data (our receive data)
1428 */
1429 static void unthrottle(struct tty_struct * tty)
1430 {
1431 struct slgt_info *info = tty->driver_data;
1432 unsigned long flags;
1433
1434 if (sanity_check(info, tty->name, "unthrottle"))
1435 return;
1436 DBGINFO(("%s unthrottle\n", info->device_name));
1437 if (I_IXOFF(tty)) {
1438 if (info->x_char)
1439 info->x_char = 0;
1440 else
1441 send_xchar(tty, START_CHAR(tty));
1442 }
1443 if (tty->termios->c_cflag & CRTSCTS) {
1444 spin_lock_irqsave(&info->lock,flags);
1445 info->signals |= SerialSignal_RTS;
1446 set_signals(info);
1447 spin_unlock_irqrestore(&info->lock,flags);
1448 }
1449 }
1450
1451 /*
1452 * set or clear transmit break condition
1453 * break_state -1=set break condition, 0=clear
1454 */
1455 static void set_break(struct tty_struct *tty, int break_state)
1456 {
1457 struct slgt_info *info = tty->driver_data;
1458 unsigned short value;
1459 unsigned long flags;
1460
1461 if (sanity_check(info, tty->name, "set_break"))
1462 return;
1463 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1464
1465 spin_lock_irqsave(&info->lock,flags);
1466 value = rd_reg16(info, TCR);
1467 if (break_state == -1)
1468 value |= BIT6;
1469 else
1470 value &= ~BIT6;
1471 wr_reg16(info, TCR, value);
1472 spin_unlock_irqrestore(&info->lock,flags);
1473 }
1474
1475 #if SYNCLINK_GENERIC_HDLC
1476
1477 /**
1478 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1479 * set encoding and frame check sequence (FCS) options
1480 *
1481 * dev pointer to network device structure
1482 * encoding serial encoding setting
1483 * parity FCS setting
1484 *
1485 * returns 0 if success, otherwise error code
1486 */
1487 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1488 unsigned short parity)
1489 {
1490 struct slgt_info *info = dev_to_port(dev);
1491 unsigned char new_encoding;
1492 unsigned short new_crctype;
1493
1494 /* return error if TTY interface open */
1495 if (info->port.count)
1496 return -EBUSY;
1497
1498 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1499
1500 switch (encoding)
1501 {
1502 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1503 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1504 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1505 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1506 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1507 default: return -EINVAL;
1508 }
1509
1510 switch (parity)
1511 {
1512 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1513 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1514 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1515 default: return -EINVAL;
1516 }
1517
1518 info->params.encoding = new_encoding;
1519 info->params.crc_type = new_crctype;
1520
1521 /* if network interface up, reprogram hardware */
1522 if (info->netcount)
1523 program_hw(info);
1524
1525 return 0;
1526 }
1527
1528 /**
1529 * called by generic HDLC layer to send frame
1530 *
1531 * skb socket buffer containing HDLC frame
1532 * dev pointer to network device structure
1533 *
1534 * returns 0 if success, otherwise error code
1535 */
1536 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1537 {
1538 struct slgt_info *info = dev_to_port(dev);
1539 unsigned long flags;
1540
1541 DBGINFO(("%s hdlc_xmit\n", dev->name));
1542
1543 /* stop sending until this frame completes */
1544 netif_stop_queue(dev);
1545
1546 /* copy data to device buffers */
1547 info->tx_count = skb->len;
1548 tx_load(info, skb->data, skb->len);
1549
1550 /* update network statistics */
1551 dev->stats.tx_packets++;
1552 dev->stats.tx_bytes += skb->len;
1553
1554 /* done with socket buffer, so free it */
1555 dev_kfree_skb(skb);
1556
1557 /* save start time for transmit timeout detection */
1558 dev->trans_start = jiffies;
1559
1560 /* start hardware transmitter if necessary */
1561 spin_lock_irqsave(&info->lock,flags);
1562 if (!info->tx_active)
1563 tx_start(info);
1564 spin_unlock_irqrestore(&info->lock,flags);
1565
1566 return 0;
1567 }
1568
1569 /**
1570 * called by network layer when interface enabled
1571 * claim resources and initialize hardware
1572 *
1573 * dev pointer to network device structure
1574 *
1575 * returns 0 if success, otherwise error code
1576 */
1577 static int hdlcdev_open(struct net_device *dev)
1578 {
1579 struct slgt_info *info = dev_to_port(dev);
1580 int rc;
1581 unsigned long flags;
1582
1583 if (!try_module_get(THIS_MODULE))
1584 return -EBUSY;
1585
1586 DBGINFO(("%s hdlcdev_open\n", dev->name));
1587
1588 /* generic HDLC layer open processing */
1589 if ((rc = hdlc_open(dev)))
1590 return rc;
1591
1592 /* arbitrate between network and tty opens */
1593 spin_lock_irqsave(&info->netlock, flags);
1594 if (info->port.count != 0 || info->netcount != 0) {
1595 DBGINFO(("%s hdlc_open busy\n", dev->name));
1596 spin_unlock_irqrestore(&info->netlock, flags);
1597 return -EBUSY;
1598 }
1599 info->netcount=1;
1600 spin_unlock_irqrestore(&info->netlock, flags);
1601
1602 /* claim resources and init adapter */
1603 if ((rc = startup(info)) != 0) {
1604 spin_lock_irqsave(&info->netlock, flags);
1605 info->netcount=0;
1606 spin_unlock_irqrestore(&info->netlock, flags);
1607 return rc;
1608 }
1609
1610 /* assert DTR and RTS, apply hardware settings */
1611 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1612 program_hw(info);
1613
1614 /* enable network layer transmit */
1615 dev->trans_start = jiffies;
1616 netif_start_queue(dev);
1617
1618 /* inform generic HDLC layer of current DCD status */
1619 spin_lock_irqsave(&info->lock, flags);
1620 get_signals(info);
1621 spin_unlock_irqrestore(&info->lock, flags);
1622 if (info->signals & SerialSignal_DCD)
1623 netif_carrier_on(dev);
1624 else
1625 netif_carrier_off(dev);
1626 return 0;
1627 }
1628
1629 /**
1630 * called by network layer when interface is disabled
1631 * shutdown hardware and release resources
1632 *
1633 * dev pointer to network device structure
1634 *
1635 * returns 0 if success, otherwise error code
1636 */
1637 static int hdlcdev_close(struct net_device *dev)
1638 {
1639 struct slgt_info *info = dev_to_port(dev);
1640 unsigned long flags;
1641
1642 DBGINFO(("%s hdlcdev_close\n", dev->name));
1643
1644 netif_stop_queue(dev);
1645
1646 /* shutdown adapter and release resources */
1647 shutdown(info);
1648
1649 hdlc_close(dev);
1650
1651 spin_lock_irqsave(&info->netlock, flags);
1652 info->netcount=0;
1653 spin_unlock_irqrestore(&info->netlock, flags);
1654
1655 module_put(THIS_MODULE);
1656 return 0;
1657 }
1658
1659 /**
1660 * called by network layer to process IOCTL call to network device
1661 *
1662 * dev pointer to network device structure
1663 * ifr pointer to network interface request structure
1664 * cmd IOCTL command code
1665 *
1666 * returns 0 if success, otherwise error code
1667 */
1668 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1669 {
1670 const size_t size = sizeof(sync_serial_settings);
1671 sync_serial_settings new_line;
1672 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1673 struct slgt_info *info = dev_to_port(dev);
1674 unsigned int flags;
1675
1676 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1677
1678 /* return error if TTY interface open */
1679 if (info->port.count)
1680 return -EBUSY;
1681
1682 if (cmd != SIOCWANDEV)
1683 return hdlc_ioctl(dev, ifr, cmd);
1684
1685 switch(ifr->ifr_settings.type) {
1686 case IF_GET_IFACE: /* return current sync_serial_settings */
1687
1688 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1689 if (ifr->ifr_settings.size < size) {
1690 ifr->ifr_settings.size = size; /* data size wanted */
1691 return -ENOBUFS;
1692 }
1693
1694 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1695 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1696 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1697 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1698
1699 switch (flags){
1700 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1701 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1702 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1703 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1704 default: new_line.clock_type = CLOCK_DEFAULT;
1705 }
1706
1707 new_line.clock_rate = info->params.clock_speed;
1708 new_line.loopback = info->params.loopback ? 1:0;
1709
1710 if (copy_to_user(line, &new_line, size))
1711 return -EFAULT;
1712 return 0;
1713
1714 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1715
1716 if(!capable(CAP_NET_ADMIN))
1717 return -EPERM;
1718 if (copy_from_user(&new_line, line, size))
1719 return -EFAULT;
1720
1721 switch (new_line.clock_type)
1722 {
1723 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1724 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1725 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1726 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1727 case CLOCK_DEFAULT: flags = info->params.flags &
1728 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1729 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1730 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1731 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1732 default: return -EINVAL;
1733 }
1734
1735 if (new_line.loopback != 0 && new_line.loopback != 1)
1736 return -EINVAL;
1737
1738 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1739 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1740 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1741 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1742 info->params.flags |= flags;
1743
1744 info->params.loopback = new_line.loopback;
1745
1746 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1747 info->params.clock_speed = new_line.clock_rate;
1748 else
1749 info->params.clock_speed = 0;
1750
1751 /* if network interface up, reprogram hardware */
1752 if (info->netcount)
1753 program_hw(info);
1754 return 0;
1755
1756 default:
1757 return hdlc_ioctl(dev, ifr, cmd);
1758 }
1759 }
1760
1761 /**
1762 * called by network layer when transmit timeout is detected
1763 *
1764 * dev pointer to network device structure
1765 */
1766 static void hdlcdev_tx_timeout(struct net_device *dev)
1767 {
1768 struct slgt_info *info = dev_to_port(dev);
1769 unsigned long flags;
1770
1771 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1772
1773 dev->stats.tx_errors++;
1774 dev->stats.tx_aborted_errors++;
1775
1776 spin_lock_irqsave(&info->lock,flags);
1777 tx_stop(info);
1778 spin_unlock_irqrestore(&info->lock,flags);
1779
1780 netif_wake_queue(dev);
1781 }
1782
1783 /**
1784 * called by device driver when transmit completes
1785 * reenable network layer transmit if stopped
1786 *
1787 * info pointer to device instance information
1788 */
1789 static void hdlcdev_tx_done(struct slgt_info *info)
1790 {
1791 if (netif_queue_stopped(info->netdev))
1792 netif_wake_queue(info->netdev);
1793 }
1794
1795 /**
1796 * called by device driver when frame received
1797 * pass frame to network layer
1798 *
1799 * info pointer to device instance information
1800 * buf pointer to buffer contianing frame data
1801 * size count of data bytes in buf
1802 */
1803 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1804 {
1805 struct sk_buff *skb = dev_alloc_skb(size);
1806 struct net_device *dev = info->netdev;
1807
1808 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1809
1810 if (skb == NULL) {
1811 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1812 dev->stats.rx_dropped++;
1813 return;
1814 }
1815
1816 memcpy(skb_put(skb, size), buf, size);
1817
1818 skb->protocol = hdlc_type_trans(skb, dev);
1819
1820 dev->stats.rx_packets++;
1821 dev->stats.rx_bytes += size;
1822
1823 netif_rx(skb);
1824
1825 dev->last_rx = jiffies;
1826 }
1827
1828 /**
1829 * called by device driver when adding device instance
1830 * do generic HDLC initialization
1831 *
1832 * info pointer to device instance information
1833 *
1834 * returns 0 if success, otherwise error code
1835 */
1836 static int hdlcdev_init(struct slgt_info *info)
1837 {
1838 int rc;
1839 struct net_device *dev;
1840 hdlc_device *hdlc;
1841
1842 /* allocate and initialize network and HDLC layer objects */
1843
1844 if (!(dev = alloc_hdlcdev(info))) {
1845 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1846 return -ENOMEM;
1847 }
1848
1849 /* for network layer reporting purposes only */
1850 dev->mem_start = info->phys_reg_addr;
1851 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1852 dev->irq = info->irq_level;
1853
1854 /* network layer callbacks and settings */
1855 dev->do_ioctl = hdlcdev_ioctl;
1856 dev->open = hdlcdev_open;
1857 dev->stop = hdlcdev_close;
1858 dev->tx_timeout = hdlcdev_tx_timeout;
1859 dev->watchdog_timeo = 10*HZ;
1860 dev->tx_queue_len = 50;
1861
1862 /* generic HDLC layer callbacks and settings */
1863 hdlc = dev_to_hdlc(dev);
1864 hdlc->attach = hdlcdev_attach;
1865 hdlc->xmit = hdlcdev_xmit;
1866
1867 /* register objects with HDLC layer */
1868 if ((rc = register_hdlc_device(dev))) {
1869 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1870 free_netdev(dev);
1871 return rc;
1872 }
1873
1874 info->netdev = dev;
1875 return 0;
1876 }
1877
1878 /**
1879 * called by device driver when removing device instance
1880 * do generic HDLC cleanup
1881 *
1882 * info pointer to device instance information
1883 */
1884 static void hdlcdev_exit(struct slgt_info *info)
1885 {
1886 unregister_hdlc_device(info->netdev);
1887 free_netdev(info->netdev);
1888 info->netdev = NULL;
1889 }
1890
1891 #endif /* ifdef CONFIG_HDLC */
1892
1893 /*
1894 * get async data from rx DMA buffers
1895 */
1896 static void rx_async(struct slgt_info *info)
1897 {
1898 struct tty_struct *tty = info->port.tty;
1899 struct mgsl_icount *icount = &info->icount;
1900 unsigned int start, end;
1901 unsigned char *p;
1902 unsigned char status;
1903 struct slgt_desc *bufs = info->rbufs;
1904 int i, count;
1905 int chars = 0;
1906 int stat;
1907 unsigned char ch;
1908
1909 start = end = info->rbuf_current;
1910
1911 while(desc_complete(bufs[end])) {
1912 count = desc_count(bufs[end]) - info->rbuf_index;
1913 p = bufs[end].buf + info->rbuf_index;
1914
1915 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1916 DBGDATA(info, p, count, "rx");
1917
1918 for(i=0 ; i < count; i+=2, p+=2) {
1919 ch = *p;
1920 icount->rx++;
1921
1922 stat = 0;
1923
1924 if ((status = *(p+1) & (BIT1 + BIT0))) {
1925 if (status & BIT1)
1926 icount->parity++;
1927 else if (status & BIT0)
1928 icount->frame++;
1929 /* discard char if tty control flags say so */
1930 if (status & info->ignore_status_mask)
1931 continue;
1932 if (status & BIT1)
1933 stat = TTY_PARITY;
1934 else if (status & BIT0)
1935 stat = TTY_FRAME;
1936 }
1937 if (tty) {
1938 tty_insert_flip_char(tty, ch, stat);
1939 chars++;
1940 }
1941 }
1942
1943 if (i < count) {
1944 /* receive buffer not completed */
1945 info->rbuf_index += i;
1946 mod_timer(&info->rx_timer, jiffies + 1);
1947 break;
1948 }
1949
1950 info->rbuf_index = 0;
1951 free_rbufs(info, end, end);
1952
1953 if (++end == info->rbuf_count)
1954 end = 0;
1955
1956 /* if entire list searched then no frame available */
1957 if (end == start)
1958 break;
1959 }
1960
1961 if (tty && chars)
1962 tty_flip_buffer_push(tty);
1963 }
1964
1965 /*
1966 * return next bottom half action to perform
1967 */
1968 static int bh_action(struct slgt_info *info)
1969 {
1970 unsigned long flags;
1971 int rc;
1972
1973 spin_lock_irqsave(&info->lock,flags);
1974
1975 if (info->pending_bh & BH_RECEIVE) {
1976 info->pending_bh &= ~BH_RECEIVE;
1977 rc = BH_RECEIVE;
1978 } else if (info->pending_bh & BH_TRANSMIT) {
1979 info->pending_bh &= ~BH_TRANSMIT;
1980 rc = BH_TRANSMIT;
1981 } else if (info->pending_bh & BH_STATUS) {
1982 info->pending_bh &= ~BH_STATUS;
1983 rc = BH_STATUS;
1984 } else {
1985 /* Mark BH routine as complete */
1986 info->bh_running = false;
1987 info->bh_requested = false;
1988 rc = 0;
1989 }
1990
1991 spin_unlock_irqrestore(&info->lock,flags);
1992
1993 return rc;
1994 }
1995
1996 /*
1997 * perform bottom half processing
1998 */
1999 static void bh_handler(struct work_struct *work)
2000 {
2001 struct slgt_info *info = container_of(work, struct slgt_info, task);
2002 int action;
2003
2004 if (!info)
2005 return;
2006 info->bh_running = true;
2007
2008 while((action = bh_action(info))) {
2009 switch (action) {
2010 case BH_RECEIVE:
2011 DBGBH(("%s bh receive\n", info->device_name));
2012 switch(info->params.mode) {
2013 case MGSL_MODE_ASYNC:
2014 rx_async(info);
2015 break;
2016 case MGSL_MODE_HDLC:
2017 while(rx_get_frame(info));
2018 break;
2019 case MGSL_MODE_RAW:
2020 case MGSL_MODE_MONOSYNC:
2021 case MGSL_MODE_BISYNC:
2022 while(rx_get_buf(info));
2023 break;
2024 }
2025 /* restart receiver if rx DMA buffers exhausted */
2026 if (info->rx_restart)
2027 rx_start(info);
2028 break;
2029 case BH_TRANSMIT:
2030 bh_transmit(info);
2031 break;
2032 case BH_STATUS:
2033 DBGBH(("%s bh status\n", info->device_name));
2034 info->ri_chkcount = 0;
2035 info->dsr_chkcount = 0;
2036 info->dcd_chkcount = 0;
2037 info->cts_chkcount = 0;
2038 break;
2039 default:
2040 DBGBH(("%s unknown action\n", info->device_name));
2041 break;
2042 }
2043 }
2044 DBGBH(("%s bh_handler exit\n", info->device_name));
2045 }
2046
2047 static void bh_transmit(struct slgt_info *info)
2048 {
2049 struct tty_struct *tty = info->port.tty;
2050
2051 DBGBH(("%s bh_transmit\n", info->device_name));
2052 if (tty)
2053 tty_wakeup(tty);
2054 }
2055
2056 static void dsr_change(struct slgt_info *info, unsigned short status)
2057 {
2058 if (status & BIT3) {
2059 info->signals |= SerialSignal_DSR;
2060 info->input_signal_events.dsr_up++;
2061 } else {
2062 info->signals &= ~SerialSignal_DSR;
2063 info->input_signal_events.dsr_down++;
2064 }
2065 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2066 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2067 slgt_irq_off(info, IRQ_DSR);
2068 return;
2069 }
2070 info->icount.dsr++;
2071 wake_up_interruptible(&info->status_event_wait_q);
2072 wake_up_interruptible(&info->event_wait_q);
2073 info->pending_bh |= BH_STATUS;
2074 }
2075
2076 static void cts_change(struct slgt_info *info, unsigned short status)
2077 {
2078 if (status & BIT2) {
2079 info->signals |= SerialSignal_CTS;
2080 info->input_signal_events.cts_up++;
2081 } else {
2082 info->signals &= ~SerialSignal_CTS;
2083 info->input_signal_events.cts_down++;
2084 }
2085 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2086 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2087 slgt_irq_off(info, IRQ_CTS);
2088 return;
2089 }
2090 info->icount.cts++;
2091 wake_up_interruptible(&info->status_event_wait_q);
2092 wake_up_interruptible(&info->event_wait_q);
2093 info->pending_bh |= BH_STATUS;
2094
2095 if (info->port.flags & ASYNC_CTS_FLOW) {
2096 if (info->port.tty) {
2097 if (info->port.tty->hw_stopped) {
2098 if (info->signals & SerialSignal_CTS) {
2099 info->port.tty->hw_stopped = 0;
2100 info->pending_bh |= BH_TRANSMIT;
2101 return;
2102 }
2103 } else {
2104 if (!(info->signals & SerialSignal_CTS))
2105 info->port.tty->hw_stopped = 1;
2106 }
2107 }
2108 }
2109 }
2110
2111 static void dcd_change(struct slgt_info *info, unsigned short status)
2112 {
2113 if (status & BIT1) {
2114 info->signals |= SerialSignal_DCD;
2115 info->input_signal_events.dcd_up++;
2116 } else {
2117 info->signals &= ~SerialSignal_DCD;
2118 info->input_signal_events.dcd_down++;
2119 }
2120 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2121 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2122 slgt_irq_off(info, IRQ_DCD);
2123 return;
2124 }
2125 info->icount.dcd++;
2126 #if SYNCLINK_GENERIC_HDLC
2127 if (info->netcount) {
2128 if (info->signals & SerialSignal_DCD)
2129 netif_carrier_on(info->netdev);
2130 else
2131 netif_carrier_off(info->netdev);
2132 }
2133 #endif
2134 wake_up_interruptible(&info->status_event_wait_q);
2135 wake_up_interruptible(&info->event_wait_q);
2136 info->pending_bh |= BH_STATUS;
2137
2138 if (info->port.flags & ASYNC_CHECK_CD) {
2139 if (info->signals & SerialSignal_DCD)
2140 wake_up_interruptible(&info->port.open_wait);
2141 else {
2142 if (info->port.tty)
2143 tty_hangup(info->port.tty);
2144 }
2145 }
2146 }
2147
2148 static void ri_change(struct slgt_info *info, unsigned short status)
2149 {
2150 if (status & BIT0) {
2151 info->signals |= SerialSignal_RI;
2152 info->input_signal_events.ri_up++;
2153 } else {
2154 info->signals &= ~SerialSignal_RI;
2155 info->input_signal_events.ri_down++;
2156 }
2157 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2158 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2159 slgt_irq_off(info, IRQ_RI);
2160 return;
2161 }
2162 info->icount.rng++;
2163 wake_up_interruptible(&info->status_event_wait_q);
2164 wake_up_interruptible(&info->event_wait_q);
2165 info->pending_bh |= BH_STATUS;
2166 }
2167
2168 static void isr_serial(struct slgt_info *info)
2169 {
2170 unsigned short status = rd_reg16(info, SSR);
2171
2172 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2173
2174 wr_reg16(info, SSR, status); /* clear pending */
2175
2176 info->irq_occurred = true;
2177
2178 if (info->params.mode == MGSL_MODE_ASYNC) {
2179 if (status & IRQ_TXIDLE) {
2180 if (info->tx_count)
2181 isr_txeom(info, status);
2182 }
2183 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2184 info->icount.brk++;
2185 /* process break detection if tty control allows */
2186 if (info->port.tty) {
2187 if (!(status & info->ignore_status_mask)) {
2188 if (info->read_status_mask & MASK_BREAK) {
2189 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2190 if (info->port.flags & ASYNC_SAK)
2191 do_SAK(info->port.tty);
2192 }
2193 }
2194 }
2195 }
2196 } else {
2197 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2198 isr_txeom(info, status);
2199
2200 if (status & IRQ_RXIDLE) {
2201 if (status & RXIDLE)
2202 info->icount.rxidle++;
2203 else
2204 info->icount.exithunt++;
2205 wake_up_interruptible(&info->event_wait_q);
2206 }
2207
2208 if (status & IRQ_RXOVER)
2209 rx_start(info);
2210 }
2211
2212 if (status & IRQ_DSR)
2213 dsr_change(info, status);
2214 if (status & IRQ_CTS)
2215 cts_change(info, status);
2216 if (status & IRQ_DCD)
2217 dcd_change(info, status);
2218 if (status & IRQ_RI)
2219 ri_change(info, status);
2220 }
2221
2222 static void isr_rdma(struct slgt_info *info)
2223 {
2224 unsigned int status = rd_reg32(info, RDCSR);
2225
2226 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2227
2228 /* RDCSR (rx DMA control/status)
2229 *
2230 * 31..07 reserved
2231 * 06 save status byte to DMA buffer
2232 * 05 error
2233 * 04 eol (end of list)
2234 * 03 eob (end of buffer)
2235 * 02 IRQ enable
2236 * 01 reset
2237 * 00 enable
2238 */
2239 wr_reg32(info, RDCSR, status); /* clear pending */
2240
2241 if (status & (BIT5 + BIT4)) {
2242 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2243 info->rx_restart = true;
2244 }
2245 info->pending_bh |= BH_RECEIVE;
2246 }
2247
2248 static void isr_tdma(struct slgt_info *info)
2249 {
2250 unsigned int status = rd_reg32(info, TDCSR);
2251
2252 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2253
2254 /* TDCSR (tx DMA control/status)
2255 *
2256 * 31..06 reserved
2257 * 05 error
2258 * 04 eol (end of list)
2259 * 03 eob (end of buffer)
2260 * 02 IRQ enable
2261 * 01 reset
2262 * 00 enable
2263 */
2264 wr_reg32(info, TDCSR, status); /* clear pending */
2265
2266 if (status & (BIT5 + BIT4 + BIT3)) {
2267 // another transmit buffer has completed
2268 // run bottom half to get more send data from user
2269 info->pending_bh |= BH_TRANSMIT;
2270 }
2271 }
2272
2273 static void isr_txeom(struct slgt_info *info, unsigned short status)
2274 {
2275 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2276
2277 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2278 tdma_reset(info);
2279 reset_tbufs(info);
2280 if (status & IRQ_TXUNDER) {
2281 unsigned short val = rd_reg16(info, TCR);
2282 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2283 wr_reg16(info, TCR, val); /* clear reset bit */
2284 }
2285
2286 if (info->tx_active) {
2287 if (info->params.mode != MGSL_MODE_ASYNC) {
2288 if (status & IRQ_TXUNDER)
2289 info->icount.txunder++;
2290 else if (status & IRQ_TXIDLE)
2291 info->icount.txok++;
2292 }
2293
2294 info->tx_active = false;
2295 info->tx_count = 0;
2296
2297 del_timer(&info->tx_timer);
2298
2299 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2300 info->signals &= ~SerialSignal_RTS;
2301 info->drop_rts_on_tx_done = false;
2302 set_signals(info);
2303 }
2304
2305 #if SYNCLINK_GENERIC_HDLC
2306 if (info->netcount)
2307 hdlcdev_tx_done(info);
2308 else
2309 #endif
2310 {
2311 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2312 tx_stop(info);
2313 return;
2314 }
2315 info->pending_bh |= BH_TRANSMIT;
2316 }
2317 }
2318 }
2319
2320 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2321 {
2322 struct cond_wait *w, *prev;
2323
2324 /* wake processes waiting for specific transitions */
2325 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2326 if (w->data & changed) {
2327 w->data = state;
2328 wake_up_interruptible(&w->q);
2329 if (prev != NULL)
2330 prev->next = w->next;
2331 else
2332 info->gpio_wait_q = w->next;
2333 } else
2334 prev = w;
2335 }
2336 }
2337
2338 /* interrupt service routine
2339 *
2340 * irq interrupt number
2341 * dev_id device ID supplied during interrupt registration
2342 */
2343 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2344 {
2345 struct slgt_info *info = dev_id;
2346 unsigned int gsr;
2347 unsigned int i;
2348
2349 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2350
2351 spin_lock(&info->lock);
2352
2353 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2354 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2355 info->irq_occurred = true;
2356 for(i=0; i < info->port_count ; i++) {
2357 if (info->port_array[i] == NULL)
2358 continue;
2359 if (gsr & (BIT8 << i))
2360 isr_serial(info->port_array[i]);
2361 if (gsr & (BIT16 << (i*2)))
2362 isr_rdma(info->port_array[i]);
2363 if (gsr & (BIT17 << (i*2)))
2364 isr_tdma(info->port_array[i]);
2365 }
2366 }
2367
2368 if (info->gpio_present) {
2369 unsigned int state;
2370 unsigned int changed;
2371 while ((changed = rd_reg32(info, IOSR)) != 0) {
2372 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2373 /* read latched state of GPIO signals */
2374 state = rd_reg32(info, IOVR);
2375 /* clear pending GPIO interrupt bits */
2376 wr_reg32(info, IOSR, changed);
2377 for (i=0 ; i < info->port_count ; i++) {
2378 if (info->port_array[i] != NULL)
2379 isr_gpio(info->port_array[i], changed, state);
2380 }
2381 }
2382 }
2383
2384 for(i=0; i < info->port_count ; i++) {
2385 struct slgt_info *port = info->port_array[i];
2386
2387 if (port && (port->port.count || port->netcount) &&
2388 port->pending_bh && !port->bh_running &&
2389 !port->bh_requested) {
2390 DBGISR(("%s bh queued\n", port->device_name));
2391 schedule_work(&port->task);
2392 port->bh_requested = true;
2393 }
2394 }
2395
2396 spin_unlock(&info->lock);
2397
2398 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2399 return IRQ_HANDLED;
2400 }
2401
2402 static int startup(struct slgt_info *info)
2403 {
2404 DBGINFO(("%s startup\n", info->device_name));
2405
2406 if (info->port.flags & ASYNC_INITIALIZED)
2407 return 0;
2408
2409 if (!info->tx_buf) {
2410 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2411 if (!info->tx_buf) {
2412 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2413 return -ENOMEM;
2414 }
2415 }
2416
2417 info->pending_bh = 0;
2418
2419 memset(&info->icount, 0, sizeof(info->icount));
2420
2421 /* program hardware for current parameters */
2422 change_params(info);
2423
2424 if (info->port.tty)
2425 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2426
2427 info->port.flags |= ASYNC_INITIALIZED;
2428
2429 return 0;
2430 }
2431
2432 /*
2433 * called by close() and hangup() to shutdown hardware
2434 */
2435 static void shutdown(struct slgt_info *info)
2436 {
2437 unsigned long flags;
2438
2439 if (!(info->port.flags & ASYNC_INITIALIZED))
2440 return;
2441
2442 DBGINFO(("%s shutdown\n", info->device_name));
2443
2444 /* clear status wait queue because status changes */
2445 /* can't happen after shutting down the hardware */
2446 wake_up_interruptible(&info->status_event_wait_q);
2447 wake_up_interruptible(&info->event_wait_q);
2448
2449 del_timer_sync(&info->tx_timer);
2450 del_timer_sync(&info->rx_timer);
2451
2452 kfree(info->tx_buf);
2453 info->tx_buf = NULL;
2454
2455 spin_lock_irqsave(&info->lock,flags);
2456
2457 tx_stop(info);
2458 rx_stop(info);
2459
2460 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2461
2462 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2463 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2464 set_signals(info);
2465 }
2466
2467 flush_cond_wait(&info->gpio_wait_q);
2468
2469 spin_unlock_irqrestore(&info->lock,flags);
2470
2471 if (info->port.tty)
2472 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2473
2474 info->port.flags &= ~ASYNC_INITIALIZED;
2475 }
2476
2477 static void program_hw(struct slgt_info *info)
2478 {
2479 unsigned long flags;
2480
2481 spin_lock_irqsave(&info->lock,flags);
2482
2483 rx_stop(info);
2484 tx_stop(info);
2485
2486 if (info->params.mode != MGSL_MODE_ASYNC ||
2487 info->netcount)
2488 sync_mode(info);
2489 else
2490 async_mode(info);
2491
2492 set_signals(info);
2493
2494 info->dcd_chkcount = 0;
2495 info->cts_chkcount = 0;
2496 info->ri_chkcount = 0;
2497 info->dsr_chkcount = 0;
2498
2499 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2500 get_signals(info);
2501
2502 if (info->netcount ||
2503 (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2504 rx_start(info);
2505
2506 spin_unlock_irqrestore(&info->lock,flags);
2507 }
2508
2509 /*
2510 * reconfigure adapter based on new parameters
2511 */
2512 static void change_params(struct slgt_info *info)
2513 {
2514 unsigned cflag;
2515 int bits_per_char;
2516
2517 if (!info->port.tty || !info->port.tty->termios)
2518 return;
2519 DBGINFO(("%s change_params\n", info->device_name));
2520
2521 cflag = info->port.tty->termios->c_cflag;
2522
2523 /* if B0 rate (hangup) specified then negate DTR and RTS */
2524 /* otherwise assert DTR and RTS */
2525 if (cflag & CBAUD)
2526 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2527 else
2528 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2529
2530 /* byte size and parity */
2531
2532 switch (cflag & CSIZE) {
2533 case CS5: info->params.data_bits = 5; break;
2534 case CS6: info->params.data_bits = 6; break;
2535 case CS7: info->params.data_bits = 7; break;
2536 case CS8: info->params.data_bits = 8; break;
2537 default: info->params.data_bits = 7; break;
2538 }
2539
2540 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2541
2542 if (cflag & PARENB)
2543 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2544 else
2545 info->params.parity = ASYNC_PARITY_NONE;
2546
2547 /* calculate number of jiffies to transmit a full
2548 * FIFO (32 bytes) at specified data rate
2549 */
2550 bits_per_char = info->params.data_bits +
2551 info->params.stop_bits + 1;
2552
2553 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2554
2555 if (info->params.data_rate) {
2556 info->timeout = (32*HZ*bits_per_char) /
2557 info->params.data_rate;
2558 }
2559 info->timeout += HZ/50; /* Add .02 seconds of slop */
2560
2561 if (cflag & CRTSCTS)
2562 info->port.flags |= ASYNC_CTS_FLOW;
2563 else
2564 info->port.flags &= ~ASYNC_CTS_FLOW;
2565
2566 if (cflag & CLOCAL)
2567 info->port.flags &= ~ASYNC_CHECK_CD;
2568 else
2569 info->port.flags |= ASYNC_CHECK_CD;
2570
2571 /* process tty input control flags */
2572
2573 info->read_status_mask = IRQ_RXOVER;
2574 if (I_INPCK(info->port.tty))
2575 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2576 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2577 info->read_status_mask |= MASK_BREAK;
2578 if (I_IGNPAR(info->port.tty))
2579 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2580 if (I_IGNBRK(info->port.tty)) {
2581 info->ignore_status_mask |= MASK_BREAK;
2582 /* If ignoring parity and break indicators, ignore
2583 * overruns too. (For real raw support).
2584 */
2585 if (I_IGNPAR(info->port.tty))
2586 info->ignore_status_mask |= MASK_OVERRUN;
2587 }
2588
2589 program_hw(info);
2590 }
2591
2592 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2593 {
2594 DBGINFO(("%s get_stats\n", info->device_name));
2595 if (!user_icount) {
2596 memset(&info->icount, 0, sizeof(info->icount));
2597 } else {
2598 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2599 return -EFAULT;
2600 }
2601 return 0;
2602 }
2603
2604 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2605 {
2606 DBGINFO(("%s get_params\n", info->device_name));
2607 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2608 return -EFAULT;
2609 return 0;
2610 }
2611
2612 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2613 {
2614 unsigned long flags;
2615 MGSL_PARAMS tmp_params;
2616
2617 DBGINFO(("%s set_params\n", info->device_name));
2618 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2619 return -EFAULT;
2620
2621 spin_lock_irqsave(&info->lock, flags);
2622 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2623 spin_unlock_irqrestore(&info->lock, flags);
2624
2625 change_params(info);
2626
2627 return 0;
2628 }
2629
2630 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2631 {
2632 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2633 if (put_user(info->idle_mode, idle_mode))
2634 return -EFAULT;
2635 return 0;
2636 }
2637
2638 static int set_txidle(struct slgt_info *info, int idle_mode)
2639 {
2640 unsigned long flags;
2641 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2642 spin_lock_irqsave(&info->lock,flags);
2643 info->idle_mode = idle_mode;
2644 if (info->params.mode != MGSL_MODE_ASYNC)
2645 tx_set_idle(info);
2646 spin_unlock_irqrestore(&info->lock,flags);
2647 return 0;
2648 }
2649
2650 static int tx_enable(struct slgt_info *info, int enable)
2651 {
2652 unsigned long flags;
2653 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2654 spin_lock_irqsave(&info->lock,flags);
2655 if (enable) {
2656 if (!info->tx_enabled)
2657 tx_start(info);
2658 } else {
2659 if (info->tx_enabled)
2660 tx_stop(info);
2661 }
2662 spin_unlock_irqrestore(&info->lock,flags);
2663 return 0;
2664 }
2665
2666 /*
2667 * abort transmit HDLC frame
2668 */
2669 static int tx_abort(struct slgt_info *info)
2670 {
2671 unsigned long flags;
2672 DBGINFO(("%s tx_abort\n", info->device_name));
2673 spin_lock_irqsave(&info->lock,flags);
2674 tdma_reset(info);
2675 spin_unlock_irqrestore(&info->lock,flags);
2676 return 0;
2677 }
2678
2679 static int rx_enable(struct slgt_info *info, int enable)
2680 {
2681 unsigned long flags;
2682 DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2683 spin_lock_irqsave(&info->lock,flags);
2684 if (enable) {
2685 if (!info->rx_enabled)
2686 rx_start(info);
2687 else if (enable == 2) {
2688 /* force hunt mode (write 1 to RCR[3]) */
2689 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2690 }
2691 } else {
2692 if (info->rx_enabled)
2693 rx_stop(info);
2694 }
2695 spin_unlock_irqrestore(&info->lock,flags);
2696 return 0;
2697 }
2698
2699 /*
2700 * wait for specified event to occur
2701 */
2702 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2703 {
2704 unsigned long flags;
2705 int s;
2706 int rc=0;
2707 struct mgsl_icount cprev, cnow;
2708 int events;
2709 int mask;
2710 struct _input_signal_events oldsigs, newsigs;
2711 DECLARE_WAITQUEUE(wait, current);
2712
2713 if (get_user(mask, mask_ptr))
2714 return -EFAULT;
2715
2716 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2717
2718 spin_lock_irqsave(&info->lock,flags);
2719
2720 /* return immediately if state matches requested events */
2721 get_signals(info);
2722 s = info->signals;
2723
2724 events = mask &
2725 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2726 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2727 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2728 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2729 if (events) {
2730 spin_unlock_irqrestore(&info->lock,flags);
2731 goto exit;
2732 }
2733
2734 /* save current irq counts */
2735 cprev = info->icount;
2736 oldsigs = info->input_signal_events;
2737
2738 /* enable hunt and idle irqs if needed */
2739 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2740 unsigned short val = rd_reg16(info, SCR);
2741 if (!(val & IRQ_RXIDLE))
2742 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2743 }
2744
2745 set_current_state(TASK_INTERRUPTIBLE);
2746 add_wait_queue(&info->event_wait_q, &wait);
2747
2748 spin_unlock_irqrestore(&info->lock,flags);
2749
2750 for(;;) {
2751 schedule();
2752 if (signal_pending(current)) {
2753 rc = -ERESTARTSYS;
2754 break;
2755 }
2756
2757 /* get current irq counts */
2758 spin_lock_irqsave(&info->lock,flags);
2759 cnow = info->icount;
2760 newsigs = info->input_signal_events;
2761 set_current_state(TASK_INTERRUPTIBLE);
2762 spin_unlock_irqrestore(&info->lock,flags);
2763
2764 /* if no change, wait aborted for some reason */
2765 if (newsigs.dsr_up == oldsigs.dsr_up &&
2766 newsigs.dsr_down == oldsigs.dsr_down &&
2767 newsigs.dcd_up == oldsigs.dcd_up &&
2768 newsigs.dcd_down == oldsigs.dcd_down &&
2769 newsigs.cts_up == oldsigs.cts_up &&
2770 newsigs.cts_down == oldsigs.cts_down &&
2771 newsigs.ri_up == oldsigs.ri_up &&
2772 newsigs.ri_down == oldsigs.ri_down &&
2773 cnow.exithunt == cprev.exithunt &&
2774 cnow.rxidle == cprev.rxidle) {
2775 rc = -EIO;
2776 break;
2777 }
2778
2779 events = mask &
2780 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2781 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2782 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2783 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2784 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2785 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2786 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2787 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2788 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2789 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2790 if (events)
2791 break;
2792
2793 cprev = cnow;
2794 oldsigs = newsigs;
2795 }
2796
2797 remove_wait_queue(&info->event_wait_q, &wait);
2798 set_current_state(TASK_RUNNING);
2799
2800
2801 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2802 spin_lock_irqsave(&info->lock,flags);
2803 if (!waitqueue_active(&info->event_wait_q)) {
2804 /* disable enable exit hunt mode/idle rcvd IRQs */
2805 wr_reg16(info, SCR,
2806 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2807 }
2808 spin_unlock_irqrestore(&info->lock,flags);
2809 }
2810 exit:
2811 if (rc == 0)
2812 rc = put_user(events, mask_ptr);
2813 return rc;
2814 }
2815
2816 static int get_interface(struct slgt_info *info, int __user *if_mode)
2817 {
2818 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2819 if (put_user(info->if_mode, if_mode))
2820 return -EFAULT;
2821 return 0;
2822 }
2823
2824 static int set_interface(struct slgt_info *info, int if_mode)
2825 {
2826 unsigned long flags;
2827 unsigned short val;
2828
2829 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2830 spin_lock_irqsave(&info->lock,flags);
2831 info->if_mode = if_mode;
2832
2833 msc_set_vcr(info);
2834
2835 /* TCR (tx control) 07 1=RTS driver control */
2836 val = rd_reg16(info, TCR);
2837 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2838 val |= BIT7;
2839 else
2840 val &= ~BIT7;
2841 wr_reg16(info, TCR, val);
2842
2843 spin_unlock_irqrestore(&info->lock,flags);
2844 return 0;
2845 }
2846
2847 /*
2848 * set general purpose IO pin state and direction
2849 *
2850 * user_gpio fields:
2851 * state each bit indicates a pin state
2852 * smask set bit indicates pin state to set
2853 * dir each bit indicates a pin direction (0=input, 1=output)
2854 * dmask set bit indicates pin direction to set
2855 */
2856 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2857 {
2858 unsigned long flags;
2859 struct gpio_desc gpio;
2860 __u32 data;
2861
2862 if (!info->gpio_present)
2863 return -EINVAL;
2864 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2865 return -EFAULT;
2866 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2867 info->device_name, gpio.state, gpio.smask,
2868 gpio.dir, gpio.dmask));
2869
2870 spin_lock_irqsave(&info->lock,flags);
2871 if (gpio.dmask) {
2872 data = rd_reg32(info, IODR);
2873 data |= gpio.dmask & gpio.dir;
2874 data &= ~(gpio.dmask & ~gpio.dir);
2875 wr_reg32(info, IODR, data);
2876 }
2877 if (gpio.smask) {
2878 data = rd_reg32(info, IOVR);
2879 data |= gpio.smask & gpio.state;
2880 data &= ~(gpio.smask & ~gpio.state);
2881 wr_reg32(info, IOVR, data);
2882 }
2883 spin_unlock_irqrestore(&info->lock,flags);
2884
2885 return 0;
2886 }
2887
2888 /*
2889 * get general purpose IO pin state and direction
2890 */
2891 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2892 {
2893 struct gpio_desc gpio;
2894 if (!info->gpio_present)
2895 return -EINVAL;
2896 gpio.state = rd_reg32(info, IOVR);
2897 gpio.smask = 0xffffffff;
2898 gpio.dir = rd_reg32(info, IODR);
2899 gpio.dmask = 0xffffffff;
2900 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2901 return -EFAULT;
2902 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2903 info->device_name, gpio.state, gpio.dir));
2904 return 0;
2905 }
2906
2907 /*
2908 * conditional wait facility
2909 */
2910 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2911 {
2912 init_waitqueue_head(&w->q);
2913 init_waitqueue_entry(&w->wait, current);
2914 w->data = data;
2915 }
2916
2917 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2918 {
2919 set_current_state(TASK_INTERRUPTIBLE);
2920 add_wait_queue(&w->q, &w->wait);
2921 w->next = *head;
2922 *head = w;
2923 }
2924
2925 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2926 {
2927 struct cond_wait *w, *prev;
2928 remove_wait_queue(&cw->q, &cw->wait);
2929 set_current_state(TASK_RUNNING);
2930 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2931 if (w == cw) {
2932 if (prev != NULL)
2933 prev->next = w->next;
2934 else
2935 *head = w->next;
2936 break;
2937 }
2938 }
2939 }
2940
2941 static void flush_cond_wait(struct cond_wait **head)
2942 {
2943 while (*head != NULL) {
2944 wake_up_interruptible(&(*head)->q);
2945 *head = (*head)->next;
2946 }
2947 }
2948
2949 /*
2950 * wait for general purpose I/O pin(s) to enter specified state
2951 *
2952 * user_gpio fields:
2953 * state - bit indicates target pin state
2954 * smask - set bit indicates watched pin
2955 *
2956 * The wait ends when at least one watched pin enters the specified
2957 * state. When 0 (no error) is returned, user_gpio->state is set to the
2958 * state of all GPIO pins when the wait ends.
2959 *
2960 * Note: Each pin may be a dedicated input, dedicated output, or
2961 * configurable input/output. The number and configuration of pins
2962 * varies with the specific adapter model. Only input pins (dedicated
2963 * or configured) can be monitored with this function.
2964 */
2965 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2966 {
2967 unsigned long flags;
2968 int rc = 0;
2969 struct gpio_desc gpio;
2970 struct cond_wait wait;
2971 u32 state;
2972
2973 if (!info->gpio_present)
2974 return -EINVAL;
2975 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2976 return -EFAULT;
2977 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2978 info->device_name, gpio.state, gpio.smask));
2979 /* ignore output pins identified by set IODR bit */
2980 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2981 return -EINVAL;
2982 init_cond_wait(&wait, gpio.smask);
2983
2984 spin_lock_irqsave(&info->lock, flags);
2985 /* enable interrupts for watched pins */
2986 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2987 /* get current pin states */
2988 state = rd_reg32(info, IOVR);
2989
2990 if (gpio.smask & ~(state ^ gpio.state)) {
2991 /* already in target state */
2992 gpio.state = state;
2993 } else {
2994 /* wait for target state */
2995 add_cond_wait(&info->gpio_wait_q, &wait);
2996 spin_unlock_irqrestore(&info->lock, flags);
2997 schedule();
2998 if (signal_pending(current))
2999 rc = -ERESTARTSYS;
3000 else
3001 gpio.state = wait.data;
3002 spin_lock_irqsave(&info->lock, flags);
3003 remove_cond_wait(&info->gpio_wait_q, &wait);
3004 }
3005
3006 /* disable all GPIO interrupts if no waiting processes */
3007 if (info->gpio_wait_q == NULL)
3008 wr_reg32(info, IOER, 0);
3009 spin_unlock_irqrestore(&info->lock,flags);
3010
3011 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3012 rc = -EFAULT;
3013 return rc;
3014 }
3015
3016 static int modem_input_wait(struct slgt_info *info,int arg)
3017 {
3018 unsigned long flags;
3019 int rc;
3020 struct mgsl_icount cprev, cnow;
3021 DECLARE_WAITQUEUE(wait, current);
3022
3023 /* save current irq counts */
3024 spin_lock_irqsave(&info->lock,flags);
3025 cprev = info->icount;
3026 add_wait_queue(&info->status_event_wait_q, &wait);
3027 set_current_state(TASK_INTERRUPTIBLE);
3028 spin_unlock_irqrestore(&info->lock,flags);
3029
3030 for(;;) {
3031 schedule();
3032 if (signal_pending(current)) {
3033 rc = -ERESTARTSYS;
3034 break;
3035 }
3036
3037 /* get new irq counts */
3038 spin_lock_irqsave(&info->lock,flags);
3039 cnow = info->icount;
3040 set_current_state(TASK_INTERRUPTIBLE);
3041 spin_unlock_irqrestore(&info->lock,flags);
3042
3043 /* if no change, wait aborted for some reason */
3044 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3045 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3046 rc = -EIO;
3047 break;
3048 }
3049
3050 /* check for change in caller specified modem input */
3051 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3052 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3053 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3054 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3055 rc = 0;
3056 break;
3057 }
3058
3059 cprev = cnow;
3060 }
3061 remove_wait_queue(&info->status_event_wait_q, &wait);
3062 set_current_state(TASK_RUNNING);
3063 return rc;
3064 }
3065
3066 /*
3067 * return state of serial control and status signals
3068 */
3069 static int tiocmget(struct tty_struct *tty, struct file *file)
3070 {
3071 struct slgt_info *info = tty->driver_data;
3072 unsigned int result;
3073 unsigned long flags;
3074
3075 spin_lock_irqsave(&info->lock,flags);
3076 get_signals(info);
3077 spin_unlock_irqrestore(&info->lock,flags);
3078
3079 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3080 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3081 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3082 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3083 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3084 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3085
3086 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3087 return result;
3088 }
3089
3090 /*
3091 * set modem control signals (DTR/RTS)
3092 *
3093 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3094 * TIOCMSET = set/clear signal values
3095 * value bit mask for command
3096 */
3097 static int tiocmset(struct tty_struct *tty, struct file *file,
3098 unsigned int set, unsigned int clear)
3099 {
3100 struct slgt_info *info = tty->driver_data;
3101 unsigned long flags;
3102
3103 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3104
3105 if (set & TIOCM_RTS)
3106 info->signals |= SerialSignal_RTS;
3107 if (set & TIOCM_DTR)
3108 info->signals |= SerialSignal_DTR;
3109 if (clear & TIOCM_RTS)
3110 info->signals &= ~SerialSignal_RTS;
3111 if (clear & TIOCM_DTR)
3112 info->signals &= ~SerialSignal_DTR;
3113
3114 spin_lock_irqsave(&info->lock,flags);
3115 set_signals(info);
3116 spin_unlock_irqrestore(&info->lock,flags);
3117 return 0;
3118 }
3119
3120 /*
3121 * block current process until the device is ready to open
3122 */
3123 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3124 struct slgt_info *info)
3125 {
3126 DECLARE_WAITQUEUE(wait, current);
3127 int retval;
3128 bool do_clocal = false;
3129 bool extra_count = false;
3130 unsigned long flags;
3131
3132 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3133
3134 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3135 /* nonblock mode is set or port is not enabled */
3136 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3137 return 0;
3138 }
3139
3140 if (tty->termios->c_cflag & CLOCAL)
3141 do_clocal = true;
3142
3143 /* Wait for carrier detect and the line to become
3144 * free (i.e., not in use by the callout). While we are in
3145 * this loop, info->port.count is dropped by one, so that
3146 * close() knows when to free things. We restore it upon
3147 * exit, either normal or abnormal.
3148 */
3149
3150 retval = 0;
3151 add_wait_queue(&info->port.open_wait, &wait);
3152
3153 spin_lock_irqsave(&info->lock, flags);
3154 if (!tty_hung_up_p(filp)) {
3155 extra_count = true;
3156 info->port.count--;
3157 }
3158 spin_unlock_irqrestore(&info->lock, flags);
3159 info->port.blocked_open++;
3160
3161 while (1) {
3162 if ((tty->termios->c_cflag & CBAUD)) {
3163 spin_lock_irqsave(&info->lock,flags);
3164 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3165 set_signals(info);
3166 spin_unlock_irqrestore(&info->lock,flags);
3167 }
3168
3169 set_current_state(TASK_INTERRUPTIBLE);
3170
3171 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3172 retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3173 -EAGAIN : -ERESTARTSYS;
3174 break;
3175 }
3176
3177 spin_lock_irqsave(&info->lock,flags);
3178 get_signals(info);
3179 spin_unlock_irqrestore(&info->lock,flags);
3180
3181 if (!(info->port.flags & ASYNC_CLOSING) &&
3182 (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3183 break;
3184 }
3185
3186 if (signal_pending(current)) {
3187 retval = -ERESTARTSYS;
3188 break;
3189 }
3190
3191 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3192 schedule();
3193 }
3194
3195 set_current_state(TASK_RUNNING);
3196 remove_wait_queue(&info->port.open_wait, &wait);
3197
3198 if (extra_count)
3199 info->port.count++;
3200 info->port.blocked_open--;
3201
3202 if (!retval)
3203 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3204
3205 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3206 return retval;
3207 }
3208
3209 static int alloc_tmp_rbuf(struct slgt_info *info)
3210 {
3211 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3212 if (info->tmp_rbuf == NULL)
3213 return -ENOMEM;
3214 return 0;
3215 }
3216
3217 static void free_tmp_rbuf(struct slgt_info *info)
3218 {
3219 kfree(info->tmp_rbuf);
3220 info->tmp_rbuf = NULL;
3221 }
3222
3223 /*
3224 * allocate DMA descriptor lists.
3225 */
3226 static int alloc_desc(struct slgt_info *info)
3227 {
3228 unsigned int i;
3229 unsigned int pbufs;
3230
3231 /* allocate memory to hold descriptor lists */
3232 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3233 if (info->bufs == NULL)
3234 return -ENOMEM;
3235
3236 memset(info->bufs, 0, DESC_LIST_SIZE);
3237
3238 info->rbufs = (struct slgt_desc*)info->bufs;
3239 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3240
3241 pbufs = (unsigned int)info->bufs_dma_addr;
3242
3243 /*
3244 * Build circular lists of descriptors
3245 */
3246
3247 for (i=0; i < info->rbuf_count; i++) {
3248 /* physical address of this descriptor */
3249 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3250
3251 /* physical address of next descriptor */
3252 if (i == info->rbuf_count - 1)
3253 info->rbufs[i].next = cpu_to_le32(pbufs);
3254 else
3255 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3256 set_desc_count(info->rbufs[i], DMABUFSIZE);
3257 }
3258
3259 for (i=0; i < info->tbuf_count; i++) {
3260 /* physical address of this descriptor */
3261 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3262
3263 /* physical address of next descriptor */
3264 if (i == info->tbuf_count - 1)
3265 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3266 else
3267 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3268 }
3269
3270 return 0;
3271 }
3272
3273 static void free_desc(struct slgt_info *info)
3274 {
3275 if (info->bufs != NULL) {
3276 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3277 info->bufs = NULL;
3278 info->rbufs = NULL;
3279 info->tbufs = NULL;
3280 }
3281 }
3282
3283 static int alloc_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 = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3288 return -ENOMEM;
3289 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3290 }
3291 return 0;
3292 }
3293
3294 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3295 {
3296 int i;
3297 for (i=0; i < count; i++) {
3298 if (bufs[i].buf == NULL)
3299 continue;
3300 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3301 bufs[i].buf = NULL;
3302 }
3303 }
3304
3305 static int alloc_dma_bufs(struct slgt_info *info)
3306 {
3307 info->rbuf_count = 32;
3308 info->tbuf_count = 32;
3309
3310 if (alloc_desc(info) < 0 ||
3311 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3312 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3313 alloc_tmp_rbuf(info) < 0) {
3314 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3315 return -ENOMEM;
3316 }
3317 reset_rbufs(info);
3318 return 0;
3319 }
3320
3321 static void free_dma_bufs(struct slgt_info *info)
3322 {
3323 if (info->bufs) {
3324 free_bufs(info, info->rbufs, info->rbuf_count);
3325 free_bufs(info, info->tbufs, info->tbuf_count);
3326 free_desc(info);
3327 }
3328 free_tmp_rbuf(info);
3329 }
3330
3331 static int claim_resources(struct slgt_info *info)
3332 {
3333 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3334 DBGERR(("%s reg addr conflict, addr=%08X\n",
3335 info->device_name, info->phys_reg_addr));
3336 info->init_error = DiagStatus_AddressConflict;
3337 goto errout;
3338 }
3339 else
3340 info->reg_addr_requested = true;
3341
3342 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3343 if (!info->reg_addr) {
3344 DBGERR(("%s cant map device registers, addr=%08X\n",
3345 info->device_name, info->phys_reg_addr));
3346 info->init_error = DiagStatus_CantAssignPciResources;
3347 goto errout;
3348 }
3349 return 0;
3350
3351 errout:
3352 release_resources(info);
3353 return -ENODEV;
3354 }
3355
3356 static void release_resources(struct slgt_info *info)
3357 {
3358 if (info->irq_requested) {
3359 free_irq(info->irq_level, info);
3360 info->irq_requested = false;
3361 }
3362
3363 if (info->reg_addr_requested) {
3364 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3365 info->reg_addr_requested = false;
3366 }
3367
3368 if (info->reg_addr) {
3369 iounmap(info->reg_addr);
3370 info->reg_addr = NULL;
3371 }
3372 }
3373
3374 /* Add the specified device instance data structure to the
3375 * global linked list of devices and increment the device count.
3376 */
3377 static void add_device(struct slgt_info *info)
3378 {
3379 char *devstr;
3380
3381 info->next_device = NULL;
3382 info->line = slgt_device_count;
3383 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3384
3385 if (info->line < MAX_DEVICES) {
3386 if (maxframe[info->line])
3387 info->max_frame_size = maxframe[info->line];
3388 info->dosyncppp = dosyncppp[info->line];
3389 }
3390
3391 slgt_device_count++;
3392
3393 if (!slgt_device_list)
3394 slgt_device_list = info;
3395 else {
3396 struct slgt_info *current_dev = slgt_device_list;
3397 while(current_dev->next_device)
3398 current_dev = current_dev->next_device;
3399 current_dev->next_device = info;
3400 }
3401
3402 if (info->max_frame_size < 4096)
3403 info->max_frame_size = 4096;
3404 else if (info->max_frame_size > 65535)
3405 info->max_frame_size = 65535;
3406
3407 switch(info->pdev->device) {
3408 case SYNCLINK_GT_DEVICE_ID:
3409 devstr = "GT";
3410 break;
3411 case SYNCLINK_GT2_DEVICE_ID:
3412 devstr = "GT2";
3413 break;
3414 case SYNCLINK_GT4_DEVICE_ID:
3415 devstr = "GT4";
3416 break;
3417 case SYNCLINK_AC_DEVICE_ID:
3418 devstr = "AC";
3419 info->params.mode = MGSL_MODE_ASYNC;
3420 break;
3421 default:
3422 devstr = "(unknown model)";
3423 }
3424 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3425 devstr, info->device_name, info->phys_reg_addr,
3426 info->irq_level, info->max_frame_size);
3427
3428 #if SYNCLINK_GENERIC_HDLC
3429 hdlcdev_init(info);
3430 #endif
3431 }
3432
3433 /*
3434 * allocate device instance structure, return NULL on failure
3435 */
3436 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3437 {
3438 struct slgt_info *info;
3439
3440 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3441
3442 if (!info) {
3443 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3444 driver_name, adapter_num, port_num));
3445 } else {
3446 tty_port_init(&info->port);
3447 info->magic = MGSL_MAGIC;
3448 INIT_WORK(&info->task, bh_handler);
3449 info->max_frame_size = 4096;
3450 info->raw_rx_size = DMABUFSIZE;
3451 info->port.close_delay = 5*HZ/10;
3452 info->port.closing_wait = 30*HZ;
3453 init_waitqueue_head(&info->status_event_wait_q);
3454 init_waitqueue_head(&info->event_wait_q);
3455 spin_lock_init(&info->netlock);
3456 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3457 info->idle_mode = HDLC_TXIDLE_FLAGS;
3458 info->adapter_num = adapter_num;
3459 info->port_num = port_num;
3460
3461 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3462 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3463
3464 /* Copy configuration info to device instance data */
3465 info->pdev = pdev;
3466 info->irq_level = pdev->irq;
3467 info->phys_reg_addr = pci_resource_start(pdev,0);
3468
3469 info->bus_type = MGSL_BUS_TYPE_PCI;
3470 info->irq_flags = IRQF_SHARED;
3471
3472 info->init_error = -1; /* assume error, set to 0 on successful init */
3473 }
3474
3475 return info;
3476 }
3477
3478 static void device_init(int adapter_num, struct pci_dev *pdev)
3479 {
3480 struct slgt_info *port_array[SLGT_MAX_PORTS];
3481 int i;
3482 int port_count = 1;
3483
3484 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3485 port_count = 2;
3486 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3487 port_count = 4;
3488
3489 /* allocate device instances for all ports */
3490 for (i=0; i < port_count; ++i) {
3491 port_array[i] = alloc_dev(adapter_num, i, pdev);
3492 if (port_array[i] == NULL) {
3493 for (--i; i >= 0; --i)
3494 kfree(port_array[i]);
3495 return;
3496 }
3497 }
3498
3499 /* give copy of port_array to all ports and add to device list */
3500 for (i=0; i < port_count; ++i) {
3501 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3502 add_device(port_array[i]);
3503 port_array[i]->port_count = port_count;
3504 spin_lock_init(&port_array[i]->lock);
3505 }
3506
3507 /* Allocate and claim adapter resources */
3508 if (!claim_resources(port_array[0])) {
3509
3510 alloc_dma_bufs(port_array[0]);
3511
3512 /* copy resource information from first port to others */
3513 for (i = 1; i < port_count; ++i) {
3514 port_array[i]->lock = port_array[0]->lock;
3515 port_array[i]->irq_level = port_array[0]->irq_level;
3516 port_array[i]->reg_addr = port_array[0]->reg_addr;
3517 alloc_dma_bufs(port_array[i]);
3518 }
3519
3520 if (request_irq(port_array[0]->irq_level,
3521 slgt_interrupt,
3522 port_array[0]->irq_flags,
3523 port_array[0]->device_name,
3524 port_array[0]) < 0) {
3525 DBGERR(("%s request_irq failed IRQ=%d\n",
3526 port_array[0]->device_name,
3527 port_array[0]->irq_level));
3528 } else {
3529 port_array[0]->irq_requested = true;
3530 adapter_test(port_array[0]);
3531 for (i=1 ; i < port_count ; i++) {
3532 port_array[i]->init_error = port_array[0]->init_error;
3533 port_array[i]->gpio_present = port_array[0]->gpio_present;
3534 }
3535 }
3536 }
3537
3538 for (i=0; i < port_count; ++i)
3539 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3540 }
3541
3542 static int __devinit init_one(struct pci_dev *dev,
3543 const struct pci_device_id *ent)
3544 {
3545 if (pci_enable_device(dev)) {
3546 printk("error enabling pci device %p\n", dev);
3547 return -EIO;
3548 }
3549 pci_set_master(dev);
3550 device_init(slgt_device_count, dev);
3551 return 0;
3552 }
3553
3554 static void __devexit remove_one(struct pci_dev *dev)
3555 {
3556 }
3557
3558 static const struct tty_operations ops = {
3559 .open = open,
3560 .close = close,
3561 .write = write,
3562 .put_char = put_char,
3563 .flush_chars = flush_chars,
3564 .write_room = write_room,
3565 .chars_in_buffer = chars_in_buffer,
3566 .flush_buffer = flush_buffer,
3567 .ioctl = ioctl,
3568 .compat_ioctl = slgt_compat_ioctl,
3569 .throttle = throttle,
3570 .unthrottle = unthrottle,
3571 .send_xchar = send_xchar,
3572 .break_ctl = set_break,
3573 .wait_until_sent = wait_until_sent,
3574 .read_proc = read_proc,
3575 .set_termios = set_termios,
3576 .stop = tx_hold,
3577 .start = tx_release,
3578 .hangup = hangup,
3579 .tiocmget = tiocmget,
3580 .tiocmset = tiocmset,
3581 };
3582
3583 static void slgt_cleanup(void)
3584 {
3585 int rc;
3586 struct slgt_info *info;
3587 struct slgt_info *tmp;
3588
3589 printk("unload %s %s\n", driver_name, driver_version);
3590
3591 if (serial_driver) {
3592 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3593 tty_unregister_device(serial_driver, info->line);
3594 if ((rc = tty_unregister_driver(serial_driver)))
3595 DBGERR(("tty_unregister_driver error=%d\n", rc));
3596 put_tty_driver(serial_driver);
3597 }
3598
3599 /* reset devices */
3600 info = slgt_device_list;
3601 while(info) {
3602 reset_port(info);
3603 info = info->next_device;
3604 }
3605
3606 /* release devices */
3607 info = slgt_device_list;
3608 while(info) {
3609 #if SYNCLINK_GENERIC_HDLC
3610 hdlcdev_exit(info);
3611 #endif
3612 free_dma_bufs(info);
3613 free_tmp_rbuf(info);
3614 if (info->port_num == 0)
3615 release_resources(info);
3616 tmp = info;
3617 info = info->next_device;
3618 kfree(tmp);
3619 }
3620
3621 if (pci_registered)
3622 pci_unregister_driver(&pci_driver);
3623 }
3624
3625 /*
3626 * Driver initialization entry point.
3627 */
3628 static int __init slgt_init(void)
3629 {
3630 int rc;
3631
3632 printk("%s %s\n", driver_name, driver_version);
3633
3634 serial_driver = alloc_tty_driver(MAX_DEVICES);
3635 if (!serial_driver) {
3636 printk("%s can't allocate tty driver\n", driver_name);
3637 return -ENOMEM;
3638 }
3639
3640 /* Initialize the tty_driver structure */
3641
3642 serial_driver->owner = THIS_MODULE;
3643 serial_driver->driver_name = tty_driver_name;
3644 serial_driver->name = tty_dev_prefix;
3645 serial_driver->major = ttymajor;
3646 serial_driver->minor_start = 64;
3647 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3648 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3649 serial_driver->init_termios = tty_std_termios;
3650 serial_driver->init_termios.c_cflag =
3651 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3652 serial_driver->init_termios.c_ispeed = 9600;
3653 serial_driver->init_termios.c_ospeed = 9600;
3654 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3655 tty_set_operations(serial_driver, &ops);
3656 if ((rc = tty_register_driver(serial_driver)) < 0) {
3657 DBGERR(("%s can't register serial driver\n", driver_name));
3658 put_tty_driver(serial_driver);
3659 serial_driver = NULL;
3660 goto error;
3661 }
3662
3663 printk("%s %s, tty major#%d\n",
3664 driver_name, driver_version,
3665 serial_driver->major);
3666
3667 slgt_device_count = 0;
3668 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3669 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3670 goto error;
3671 }
3672 pci_registered = true;
3673
3674 if (!slgt_device_list)
3675 printk("%s no devices found\n",driver_name);
3676
3677 return 0;
3678
3679 error:
3680 slgt_cleanup();
3681 return rc;
3682 }
3683
3684 static void __exit slgt_exit(void)
3685 {
3686 slgt_cleanup();
3687 }
3688
3689 module_init(slgt_init);
3690 module_exit(slgt_exit);
3691
3692 /*
3693 * register access routines
3694 */
3695
3696 #define CALC_REGADDR() \
3697 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3698 if (addr >= 0x80) \
3699 reg_addr += (info->port_num) * 32;
3700
3701 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3702 {
3703 CALC_REGADDR();
3704 return readb((void __iomem *)reg_addr);
3705 }
3706
3707 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3708 {
3709 CALC_REGADDR();
3710 writeb(value, (void __iomem *)reg_addr);
3711 }
3712
3713 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3714 {
3715 CALC_REGADDR();
3716 return readw((void __iomem *)reg_addr);
3717 }
3718
3719 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3720 {
3721 CALC_REGADDR();
3722 writew(value, (void __iomem *)reg_addr);
3723 }
3724
3725 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3726 {
3727 CALC_REGADDR();
3728 return readl((void __iomem *)reg_addr);
3729 }
3730
3731 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3732 {
3733 CALC_REGADDR();
3734 writel(value, (void __iomem *)reg_addr);
3735 }
3736
3737 static void rdma_reset(struct slgt_info *info)
3738 {
3739 unsigned int i;
3740
3741 /* set reset bit */
3742 wr_reg32(info, RDCSR, BIT1);
3743
3744 /* wait for enable bit cleared */
3745 for(i=0 ; i < 1000 ; i++)
3746 if (!(rd_reg32(info, RDCSR) & BIT0))
3747 break;
3748 }
3749
3750 static void tdma_reset(struct slgt_info *info)
3751 {
3752 unsigned int i;
3753
3754 /* set reset bit */
3755 wr_reg32(info, TDCSR, BIT1);
3756
3757 /* wait for enable bit cleared */
3758 for(i=0 ; i < 1000 ; i++)
3759 if (!(rd_reg32(info, TDCSR) & BIT0))
3760 break;
3761 }
3762
3763 /*
3764 * enable internal loopback
3765 * TxCLK and RxCLK are generated from BRG
3766 * and TxD is looped back to RxD internally.
3767 */
3768 static void enable_loopback(struct slgt_info *info)
3769 {
3770 /* SCR (serial control) BIT2=looopback enable */
3771 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3772
3773 if (info->params.mode != MGSL_MODE_ASYNC) {
3774 /* CCR (clock control)
3775 * 07..05 tx clock source (010 = BRG)
3776 * 04..02 rx clock source (010 = BRG)
3777 * 01 auxclk enable (0 = disable)
3778 * 00 BRG enable (1 = enable)
3779 *
3780 * 0100 1001
3781 */
3782 wr_reg8(info, CCR, 0x49);
3783
3784 /* set speed if available, otherwise use default */
3785 if (info->params.clock_speed)
3786 set_rate(info, info->params.clock_speed);
3787 else
3788 set_rate(info, 3686400);
3789 }
3790 }
3791
3792 /*
3793 * set baud rate generator to specified rate
3794 */
3795 static void set_rate(struct slgt_info *info, u32 rate)
3796 {
3797 unsigned int div;
3798 static unsigned int osc = 14745600;
3799
3800 /* div = osc/rate - 1
3801 *
3802 * Round div up if osc/rate is not integer to
3803 * force to next slowest rate.
3804 */
3805
3806 if (rate) {
3807 div = osc/rate;
3808 if (!(osc % rate) && div)
3809 div--;
3810 wr_reg16(info, BDR, (unsigned short)div);
3811 }
3812 }
3813
3814 static void rx_stop(struct slgt_info *info)
3815 {
3816 unsigned short val;
3817
3818 /* disable and reset receiver */
3819 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3820 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3821 wr_reg16(info, RCR, val); /* clear reset bit */
3822
3823 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3824
3825 /* clear pending rx interrupts */
3826 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3827
3828 rdma_reset(info);
3829
3830 info->rx_enabled = false;
3831 info->rx_restart = false;
3832 }
3833
3834 static void rx_start(struct slgt_info *info)
3835 {
3836 unsigned short val;
3837
3838 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3839
3840 /* clear pending rx overrun IRQ */
3841 wr_reg16(info, SSR, IRQ_RXOVER);
3842
3843 /* reset and disable receiver */
3844 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3845 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3846 wr_reg16(info, RCR, val); /* clear reset bit */
3847
3848 rdma_reset(info);
3849 reset_rbufs(info);
3850
3851 /* set 1st descriptor address */
3852 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3853
3854 if (info->params.mode != MGSL_MODE_ASYNC) {
3855 /* enable rx DMA and DMA interrupt */
3856 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3857 } else {
3858 /* enable saving of rx status, rx DMA and DMA interrupt */
3859 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3860 }
3861
3862 slgt_irq_on(info, IRQ_RXOVER);
3863
3864 /* enable receiver */
3865 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3866
3867 info->rx_restart = false;
3868 info->rx_enabled = true;
3869 }
3870
3871 static void tx_start(struct slgt_info *info)
3872 {
3873 if (!info->tx_enabled) {
3874 wr_reg16(info, TCR,
3875 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3876 info->tx_enabled = true;
3877 }
3878
3879 if (info->tx_count) {
3880 info->drop_rts_on_tx_done = false;
3881
3882 if (info->params.mode != MGSL_MODE_ASYNC) {
3883 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3884 get_signals(info);
3885 if (!(info->signals & SerialSignal_RTS)) {
3886 info->signals |= SerialSignal_RTS;
3887 set_signals(info);
3888 info->drop_rts_on_tx_done = true;
3889 }
3890 }
3891
3892 slgt_irq_off(info, IRQ_TXDATA);
3893 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3894 /* clear tx idle and underrun status bits */
3895 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3896 if (info->params.mode == MGSL_MODE_HDLC)
3897 mod_timer(&info->tx_timer, jiffies +
3898 msecs_to_jiffies(5000));
3899 } else {
3900 slgt_irq_off(info, IRQ_TXDATA);
3901 slgt_irq_on(info, IRQ_TXIDLE);
3902 /* clear tx idle status bit */
3903 wr_reg16(info, SSR, IRQ_TXIDLE);
3904 }
3905 tdma_start(info);
3906 info->tx_active = true;
3907 }
3908 }
3909
3910 /*
3911 * start transmit DMA if inactive and there are unsent buffers
3912 */
3913 static void tdma_start(struct slgt_info *info)
3914 {
3915 unsigned int i;
3916
3917 if (rd_reg32(info, TDCSR) & BIT0)
3918 return;
3919
3920 /* transmit DMA inactive, check for unsent buffers */
3921 i = info->tbuf_start;
3922 while (!desc_count(info->tbufs[i])) {
3923 if (++i == info->tbuf_count)
3924 i = 0;
3925 if (i == info->tbuf_current)
3926 return;
3927 }
3928 info->tbuf_start = i;
3929
3930 /* there are unsent buffers, start transmit DMA */
3931
3932 /* reset needed if previous error condition */
3933 tdma_reset(info);
3934
3935 /* set 1st descriptor address */
3936 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3937 switch(info->params.mode) {
3938 case MGSL_MODE_RAW:
3939 case MGSL_MODE_MONOSYNC:
3940 case MGSL_MODE_BISYNC:
3941 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3942 break;
3943 default:
3944 wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3945 }
3946 }
3947
3948 static void tx_stop(struct slgt_info *info)
3949 {
3950 unsigned short val;
3951
3952 del_timer(&info->tx_timer);
3953
3954 tdma_reset(info);
3955
3956 /* reset and disable transmitter */
3957 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3958 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3959
3960 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3961
3962 /* clear tx idle and underrun status bit */
3963 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3964
3965 reset_tbufs(info);
3966
3967 info->tx_enabled = false;
3968 info->tx_active = false;
3969 }
3970
3971 static void reset_port(struct slgt_info *info)
3972 {
3973 if (!info->reg_addr)
3974 return;
3975
3976 tx_stop(info);
3977 rx_stop(info);
3978
3979 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3980 set_signals(info);
3981
3982 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3983 }
3984
3985 static void reset_adapter(struct slgt_info *info)
3986 {
3987 int i;
3988 for (i=0; i < info->port_count; ++i) {
3989 if (info->port_array[i])
3990 reset_port(info->port_array[i]);
3991 }
3992 }
3993
3994 static void async_mode(struct slgt_info *info)
3995 {
3996 unsigned short val;
3997
3998 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3999 tx_stop(info);
4000 rx_stop(info);
4001
4002 /* TCR (tx control)
4003 *
4004 * 15..13 mode, 010=async
4005 * 12..10 encoding, 000=NRZ
4006 * 09 parity enable
4007 * 08 1=odd parity, 0=even parity
4008 * 07 1=RTS driver control
4009 * 06 1=break enable
4010 * 05..04 character length
4011 * 00=5 bits
4012 * 01=6 bits
4013 * 10=7 bits
4014 * 11=8 bits
4015 * 03 0=1 stop bit, 1=2 stop bits
4016 * 02 reset
4017 * 01 enable
4018 * 00 auto-CTS enable
4019 */
4020 val = 0x4000;
4021
4022 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4023 val |= BIT7;
4024
4025 if (info->params.parity != ASYNC_PARITY_NONE) {
4026 val |= BIT9;
4027 if (info->params.parity == ASYNC_PARITY_ODD)
4028 val |= BIT8;
4029 }
4030
4031 switch (info->params.data_bits)
4032 {
4033 case 6: val |= BIT4; break;
4034 case 7: val |= BIT5; break;
4035 case 8: val |= BIT5 + BIT4; break;
4036 }
4037
4038 if (info->params.stop_bits != 1)
4039 val |= BIT3;
4040
4041 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4042 val |= BIT0;
4043
4044 wr_reg16(info, TCR, val);
4045
4046 /* RCR (rx control)
4047 *
4048 * 15..13 mode, 010=async
4049 * 12..10 encoding, 000=NRZ
4050 * 09 parity enable
4051 * 08 1=odd parity, 0=even parity
4052 * 07..06 reserved, must be 0
4053 * 05..04 character length
4054 * 00=5 bits
4055 * 01=6 bits
4056 * 10=7 bits
4057 * 11=8 bits
4058 * 03 reserved, must be zero
4059 * 02 reset
4060 * 01 enable
4061 * 00 auto-DCD enable
4062 */
4063 val = 0x4000;
4064
4065 if (info->params.parity != ASYNC_PARITY_NONE) {
4066 val |= BIT9;
4067 if (info->params.parity == ASYNC_PARITY_ODD)
4068 val |= BIT8;
4069 }
4070
4071 switch (info->params.data_bits)
4072 {
4073 case 6: val |= BIT4; break;
4074 case 7: val |= BIT5; break;
4075 case 8: val |= BIT5 + BIT4; break;
4076 }
4077
4078 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4079 val |= BIT0;
4080
4081 wr_reg16(info, RCR, val);
4082
4083 /* CCR (clock control)
4084 *
4085 * 07..05 011 = tx clock source is BRG/16
4086 * 04..02 010 = rx clock source is BRG
4087 * 01 0 = auxclk disabled
4088 * 00 1 = BRG enabled
4089 *
4090 * 0110 1001
4091 */
4092 wr_reg8(info, CCR, 0x69);
4093
4094 msc_set_vcr(info);
4095
4096 /* SCR (serial control)
4097 *
4098 * 15 1=tx req on FIFO half empty
4099 * 14 1=rx req on FIFO half full
4100 * 13 tx data IRQ enable
4101 * 12 tx idle IRQ enable
4102 * 11 rx break on IRQ enable
4103 * 10 rx data IRQ enable
4104 * 09 rx break off IRQ enable
4105 * 08 overrun IRQ enable
4106 * 07 DSR IRQ enable
4107 * 06 CTS IRQ enable
4108 * 05 DCD IRQ enable
4109 * 04 RI IRQ enable
4110 * 03 reserved, must be zero
4111 * 02 1=txd->rxd internal loopback enable
4112 * 01 reserved, must be zero
4113 * 00 1=master IRQ enable
4114 */
4115 val = BIT15 + BIT14 + BIT0;
4116 wr_reg16(info, SCR, val);
4117
4118 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4119
4120 set_rate(info, info->params.data_rate * 16);
4121
4122 if (info->params.loopback)
4123 enable_loopback(info);
4124 }
4125
4126 static void sync_mode(struct slgt_info *info)
4127 {
4128 unsigned short val;
4129
4130 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4131 tx_stop(info);
4132 rx_stop(info);
4133
4134 /* TCR (tx control)
4135 *
4136 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4137 * 12..10 encoding
4138 * 09 CRC enable
4139 * 08 CRC32
4140 * 07 1=RTS driver control
4141 * 06 preamble enable
4142 * 05..04 preamble length
4143 * 03 share open/close flag
4144 * 02 reset
4145 * 01 enable
4146 * 00 auto-CTS enable
4147 */
4148 val = 0;
4149
4150 switch(info->params.mode) {
4151 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4152 case MGSL_MODE_BISYNC: val |= BIT15; break;
4153 case MGSL_MODE_RAW: val |= BIT13; break;
4154 }
4155 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4156 val |= BIT7;
4157
4158 switch(info->params.encoding)
4159 {
4160 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4161 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4162 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4163 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4164 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4165 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4166 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4167 }
4168
4169 switch (info->params.crc_type & HDLC_CRC_MASK)
4170 {
4171 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4172 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4173 }
4174
4175 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4176 val |= BIT6;
4177
4178 switch (info->params.preamble_length)
4179 {
4180 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4181 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4182 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4183 }
4184
4185 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4186 val |= BIT0;
4187
4188 wr_reg16(info, TCR, val);
4189
4190 /* TPR (transmit preamble) */
4191
4192 switch (info->params.preamble)
4193 {
4194 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4195 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4196 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4197 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4198 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4199 default: val = 0x7e; break;
4200 }
4201 wr_reg8(info, TPR, (unsigned char)val);
4202
4203 /* RCR (rx control)
4204 *
4205 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4206 * 12..10 encoding
4207 * 09 CRC enable
4208 * 08 CRC32
4209 * 07..03 reserved, must be 0
4210 * 02 reset
4211 * 01 enable
4212 * 00 auto-DCD enable
4213 */
4214 val = 0;
4215
4216 switch(info->params.mode) {
4217 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4218 case MGSL_MODE_BISYNC: val |= BIT15; break;
4219 case MGSL_MODE_RAW: val |= BIT13; break;
4220 }
4221
4222 switch(info->params.encoding)
4223 {
4224 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4225 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4226 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4227 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4228 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4229 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4230 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4231 }
4232
4233 switch (info->params.crc_type & HDLC_CRC_MASK)
4234 {
4235 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4236 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4237 }
4238
4239 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4240 val |= BIT0;
4241
4242 wr_reg16(info, RCR, val);
4243
4244 /* CCR (clock control)
4245 *
4246 * 07..05 tx clock source
4247 * 04..02 rx clock source
4248 * 01 auxclk enable
4249 * 00 BRG enable
4250 */
4251 val = 0;
4252
4253 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4254 {
4255 // when RxC source is DPLL, BRG generates 16X DPLL
4256 // reference clock, so take TxC from BRG/16 to get
4257 // transmit clock at actual data rate
4258 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4259 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4260 else
4261 val |= BIT6; /* 010, txclk = BRG */
4262 }
4263 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4264 val |= BIT7; /* 100, txclk = DPLL Input */
4265 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4266 val |= BIT5; /* 001, txclk = RXC Input */
4267
4268 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4269 val |= BIT3; /* 010, rxclk = BRG */
4270 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4271 val |= BIT4; /* 100, rxclk = DPLL */
4272 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4273 val |= BIT2; /* 001, rxclk = TXC Input */
4274
4275 if (info->params.clock_speed)
4276 val |= BIT1 + BIT0;
4277
4278 wr_reg8(info, CCR, (unsigned char)val);
4279
4280 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4281 {
4282 // program DPLL mode
4283 switch(info->params.encoding)
4284 {
4285 case HDLC_ENCODING_BIPHASE_MARK:
4286 case HDLC_ENCODING_BIPHASE_SPACE:
4287 val = BIT7; break;
4288 case HDLC_ENCODING_BIPHASE_LEVEL:
4289 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4290 val = BIT7 + BIT6; break;
4291 default: val = BIT6; // NRZ encodings
4292 }
4293 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4294
4295 // DPLL requires a 16X reference clock from BRG
4296 set_rate(info, info->params.clock_speed * 16);
4297 }
4298 else
4299 set_rate(info, info->params.clock_speed);
4300
4301 tx_set_idle(info);
4302
4303 msc_set_vcr(info);
4304
4305 /* SCR (serial control)
4306 *
4307 * 15 1=tx req on FIFO half empty
4308 * 14 1=rx req on FIFO half full
4309 * 13 tx data IRQ enable
4310 * 12 tx idle IRQ enable
4311 * 11 underrun IRQ enable
4312 * 10 rx data IRQ enable
4313 * 09 rx idle IRQ enable
4314 * 08 overrun IRQ enable
4315 * 07 DSR IRQ enable
4316 * 06 CTS IRQ enable
4317 * 05 DCD IRQ enable
4318 * 04 RI IRQ enable
4319 * 03 reserved, must be zero
4320 * 02 1=txd->rxd internal loopback enable
4321 * 01 reserved, must be zero
4322 * 00 1=master IRQ enable
4323 */
4324 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4325
4326 if (info->params.loopback)
4327 enable_loopback(info);
4328 }
4329
4330 /*
4331 * set transmit idle mode
4332 */
4333 static void tx_set_idle(struct slgt_info *info)
4334 {
4335 unsigned char val;
4336 unsigned short tcr;
4337
4338 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4339 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4340 */
4341 tcr = rd_reg16(info, TCR);
4342 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4343 /* disable preamble, set idle size to 16 bits */
4344 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4345 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4346 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4347 } else if (!(tcr & BIT6)) {
4348 /* preamble is disabled, set idle size to 8 bits */
4349 tcr &= ~(BIT5 + BIT4);
4350 }
4351 wr_reg16(info, TCR, tcr);
4352
4353 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4354 /* LSB of custom tx idle specified in tx idle register */
4355 val = (unsigned char)(info->idle_mode & 0xff);
4356 } else {
4357 /* standard 8 bit idle patterns */
4358 switch(info->idle_mode)
4359 {
4360 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4361 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4362 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4363 case HDLC_TXIDLE_ZEROS:
4364 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4365 default: val = 0xff;
4366 }
4367 }
4368
4369 wr_reg8(info, TIR, val);
4370 }
4371
4372 /*
4373 * get state of V24 status (input) signals
4374 */
4375 static void get_signals(struct slgt_info *info)
4376 {
4377 unsigned short status = rd_reg16(info, SSR);
4378
4379 /* clear all serial signals except DTR and RTS */
4380 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4381
4382 if (status & BIT3)
4383 info->signals |= SerialSignal_DSR;
4384 if (status & BIT2)
4385 info->signals |= SerialSignal_CTS;
4386 if (status & BIT1)
4387 info->signals |= SerialSignal_DCD;
4388 if (status & BIT0)
4389 info->signals |= SerialSignal_RI;
4390 }
4391
4392 /*
4393 * set V.24 Control Register based on current configuration
4394 */
4395 static void msc_set_vcr(struct slgt_info *info)
4396 {
4397 unsigned char val = 0;
4398
4399 /* VCR (V.24 control)
4400 *
4401 * 07..04 serial IF select
4402 * 03 DTR
4403 * 02 RTS
4404 * 01 LL
4405 * 00 RL
4406 */
4407
4408 switch(info->if_mode & MGSL_INTERFACE_MASK)
4409 {
4410 case MGSL_INTERFACE_RS232:
4411 val |= BIT5; /* 0010 */
4412 break;
4413 case MGSL_INTERFACE_V35:
4414 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4415 break;
4416 case MGSL_INTERFACE_RS422:
4417 val |= BIT6; /* 0100 */
4418 break;
4419 }
4420
4421 if (info->signals & SerialSignal_DTR)
4422 val |= BIT3;
4423 if (info->signals & SerialSignal_RTS)
4424 val |= BIT2;
4425 if (info->if_mode & MGSL_INTERFACE_LL)
4426 val |= BIT1;
4427 if (info->if_mode & MGSL_INTERFACE_RL)
4428 val |= BIT0;
4429 wr_reg8(info, VCR, val);
4430 }
4431
4432 /*
4433 * set state of V24 control (output) signals
4434 */
4435 static void set_signals(struct slgt_info *info)
4436 {
4437 unsigned char val = rd_reg8(info, VCR);
4438 if (info->signals & SerialSignal_DTR)
4439 val |= BIT3;
4440 else
4441 val &= ~BIT3;
4442 if (info->signals & SerialSignal_RTS)
4443 val |= BIT2;
4444 else
4445 val &= ~BIT2;
4446 wr_reg8(info, VCR, val);
4447 }
4448
4449 /*
4450 * free range of receive DMA buffers (i to last)
4451 */
4452 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4453 {
4454 int done = 0;
4455
4456 while(!done) {
4457 /* reset current buffer for reuse */
4458 info->rbufs[i].status = 0;
4459 switch(info->params.mode) {
4460 case MGSL_MODE_RAW:
4461 case MGSL_MODE_MONOSYNC:
4462 case MGSL_MODE_BISYNC:
4463 set_desc_count(info->rbufs[i], info->raw_rx_size);
4464 break;
4465 default:
4466 set_desc_count(info->rbufs[i], DMABUFSIZE);
4467 }
4468
4469 if (i == last)
4470 done = 1;
4471 if (++i == info->rbuf_count)
4472 i = 0;
4473 }
4474 info->rbuf_current = i;
4475 }
4476
4477 /*
4478 * mark all receive DMA buffers as free
4479 */
4480 static void reset_rbufs(struct slgt_info *info)
4481 {
4482 free_rbufs(info, 0, info->rbuf_count - 1);
4483 }
4484
4485 /*
4486 * pass receive HDLC frame to upper layer
4487 *
4488 * return true if frame available, otherwise false
4489 */
4490 static bool rx_get_frame(struct slgt_info *info)
4491 {
4492 unsigned int start, end;
4493 unsigned short status;
4494 unsigned int framesize = 0;
4495 unsigned long flags;
4496 struct tty_struct *tty = info->port.tty;
4497 unsigned char addr_field = 0xff;
4498 unsigned int crc_size = 0;
4499
4500 switch (info->params.crc_type & HDLC_CRC_MASK) {
4501 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4502 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4503 }
4504
4505 check_again:
4506
4507 framesize = 0;
4508 addr_field = 0xff;
4509 start = end = info->rbuf_current;
4510
4511 for (;;) {
4512 if (!desc_complete(info->rbufs[end]))
4513 goto cleanup;
4514
4515 if (framesize == 0 && info->params.addr_filter != 0xff)
4516 addr_field = info->rbufs[end].buf[0];
4517
4518 framesize += desc_count(info->rbufs[end]);
4519
4520 if (desc_eof(info->rbufs[end]))
4521 break;
4522
4523 if (++end == info->rbuf_count)
4524 end = 0;
4525
4526 if (end == info->rbuf_current) {
4527 if (info->rx_enabled){
4528 spin_lock_irqsave(&info->lock,flags);
4529 rx_start(info);
4530 spin_unlock_irqrestore(&info->lock,flags);
4531 }
4532 goto cleanup;
4533 }
4534 }
4535
4536 /* status
4537 *
4538 * 15 buffer complete
4539 * 14..06 reserved
4540 * 05..04 residue
4541 * 02 eof (end of frame)
4542 * 01 CRC error
4543 * 00 abort
4544 */
4545 status = desc_status(info->rbufs[end]);
4546
4547 /* ignore CRC bit if not using CRC (bit is undefined) */
4548 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4549 status &= ~BIT1;
4550
4551 if (framesize == 0 ||
4552 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4553 free_rbufs(info, start, end);
4554 goto check_again;
4555 }
4556
4557 if (framesize < (2 + crc_size) || status & BIT0) {
4558 info->icount.rxshort++;
4559 framesize = 0;
4560 } else if (status & BIT1) {
4561 info->icount.rxcrc++;
4562 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4563 framesize = 0;
4564 }
4565
4566 #if SYNCLINK_GENERIC_HDLC
4567 if (framesize == 0) {
4568 info->netdev->stats.rx_errors++;
4569 info->netdev->stats.rx_frame_errors++;
4570 }
4571 #endif
4572
4573 DBGBH(("%s rx frame status=%04X size=%d\n",
4574 info->device_name, status, framesize));
4575 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
4576
4577 if (framesize) {
4578 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4579 framesize -= crc_size;
4580 crc_size = 0;
4581 }
4582
4583 if (framesize > info->max_frame_size + crc_size)
4584 info->icount.rxlong++;
4585 else {
4586 /* copy dma buffer(s) to contiguous temp buffer */
4587 int copy_count = framesize;
4588 int i = start;
4589 unsigned char *p = info->tmp_rbuf;
4590 info->tmp_rbuf_count = framesize;
4591
4592 info->icount.rxok++;
4593
4594 while(copy_count) {
4595 int partial_count = min(copy_count, DMABUFSIZE);
4596 memcpy(p, info->rbufs[i].buf, partial_count);
4597 p += partial_count;
4598 copy_count -= partial_count;
4599 if (++i == info->rbuf_count)
4600 i = 0;
4601 }
4602
4603 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4604 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4605 framesize++;
4606 }
4607
4608 #if SYNCLINK_GENERIC_HDLC
4609 if (info->netcount)
4610 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4611 else
4612 #endif
4613 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4614 }
4615 }
4616 free_rbufs(info, start, end);
4617 return true;
4618
4619 cleanup:
4620 return false;
4621 }
4622
4623 /*
4624 * pass receive buffer (RAW synchronous mode) to tty layer
4625 * return true if buffer available, otherwise false
4626 */
4627 static bool rx_get_buf(struct slgt_info *info)
4628 {
4629 unsigned int i = info->rbuf_current;
4630 unsigned int count;
4631
4632 if (!desc_complete(info->rbufs[i]))
4633 return false;
4634 count = desc_count(info->rbufs[i]);
4635 switch(info->params.mode) {
4636 case MGSL_MODE_MONOSYNC:
4637 case MGSL_MODE_BISYNC:
4638 /* ignore residue in byte synchronous modes */
4639 if (desc_residue(info->rbufs[i]))
4640 count--;
4641 break;
4642 }
4643 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4644 DBGINFO(("rx_get_buf size=%d\n", count));
4645 if (count)
4646 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4647 info->flag_buf, count);
4648 free_rbufs(info, i, i);
4649 return true;
4650 }
4651
4652 static void reset_tbufs(struct slgt_info *info)
4653 {
4654 unsigned int i;
4655 info->tbuf_current = 0;
4656 for (i=0 ; i < info->tbuf_count ; i++) {
4657 info->tbufs[i].status = 0;
4658 info->tbufs[i].count = 0;
4659 }
4660 }
4661
4662 /*
4663 * return number of free transmit DMA buffers
4664 */
4665 static unsigned int free_tbuf_count(struct slgt_info *info)
4666 {
4667 unsigned int count = 0;
4668 unsigned int i = info->tbuf_current;
4669
4670 do
4671 {
4672 if (desc_count(info->tbufs[i]))
4673 break; /* buffer in use */
4674 ++count;
4675 if (++i == info->tbuf_count)
4676 i=0;
4677 } while (i != info->tbuf_current);
4678
4679 /* if tx DMA active, last zero count buffer is in use */
4680 if (count && (rd_reg32(info, TDCSR) & BIT0))
4681 --count;
4682
4683 return count;
4684 }
4685
4686 /*
4687 * load transmit DMA buffer(s) with data
4688 */
4689 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4690 {
4691 unsigned short count;
4692 unsigned int i;
4693 struct slgt_desc *d;
4694
4695 if (size == 0)
4696 return;
4697
4698 DBGDATA(info, buf, size, "tx");
4699
4700 info->tbuf_start = i = info->tbuf_current;
4701
4702 while (size) {
4703 d = &info->tbufs[i];
4704 if (++i == info->tbuf_count)
4705 i = 0;
4706
4707 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4708 memcpy(d->buf, buf, count);
4709
4710 size -= count;
4711 buf += count;
4712
4713 /*
4714 * set EOF bit for last buffer of HDLC frame or
4715 * for every buffer in raw mode
4716 */
4717 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4718 info->params.mode == MGSL_MODE_RAW)
4719 set_desc_eof(*d, 1);
4720 else
4721 set_desc_eof(*d, 0);
4722
4723 set_desc_count(*d, count);
4724 }
4725
4726 info->tbuf_current = i;
4727 }
4728
4729 static int register_test(struct slgt_info *info)
4730 {
4731 static unsigned short patterns[] =
4732 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4733 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4734 unsigned int i;
4735 int rc = 0;
4736
4737 for (i=0 ; i < count ; i++) {
4738 wr_reg16(info, TIR, patterns[i]);
4739 wr_reg16(info, BDR, patterns[(i+1)%count]);
4740 if ((rd_reg16(info, TIR) != patterns[i]) ||
4741 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4742 rc = -ENODEV;
4743 break;
4744 }
4745 }
4746 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4747 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4748 return rc;
4749 }
4750
4751 static int irq_test(struct slgt_info *info)
4752 {
4753 unsigned long timeout;
4754 unsigned long flags;
4755 struct tty_struct *oldtty = info->port.tty;
4756 u32 speed = info->params.data_rate;
4757
4758 info->params.data_rate = 921600;
4759 info->port.tty = NULL;
4760
4761 spin_lock_irqsave(&info->lock, flags);
4762 async_mode(info);
4763 slgt_irq_on(info, IRQ_TXIDLE);
4764
4765 /* enable transmitter */
4766 wr_reg16(info, TCR,
4767 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4768
4769 /* write one byte and wait for tx idle */
4770 wr_reg16(info, TDR, 0);
4771
4772 /* assume failure */
4773 info->init_error = DiagStatus_IrqFailure;
4774 info->irq_occurred = false;
4775
4776 spin_unlock_irqrestore(&info->lock, flags);
4777
4778 timeout=100;
4779 while(timeout-- && !info->irq_occurred)
4780 msleep_interruptible(10);
4781
4782 spin_lock_irqsave(&info->lock,flags);
4783 reset_port(info);
4784 spin_unlock_irqrestore(&info->lock,flags);
4785
4786 info->params.data_rate = speed;
4787 info->port.tty = oldtty;
4788
4789 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4790 return info->irq_occurred ? 0 : -ENODEV;
4791 }
4792
4793 static int loopback_test_rx(struct slgt_info *info)
4794 {
4795 unsigned char *src, *dest;
4796 int count;
4797
4798 if (desc_complete(info->rbufs[0])) {
4799 count = desc_count(info->rbufs[0]);
4800 src = info->rbufs[0].buf;
4801 dest = info->tmp_rbuf;
4802
4803 for( ; count ; count-=2, src+=2) {
4804 /* src=data byte (src+1)=status byte */
4805 if (!(*(src+1) & (BIT9 + BIT8))) {
4806 *dest = *src;
4807 dest++;
4808 info->tmp_rbuf_count++;
4809 }
4810 }
4811 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4812 return 1;
4813 }
4814 return 0;
4815 }
4816
4817 static int loopback_test(struct slgt_info *info)
4818 {
4819 #define TESTFRAMESIZE 20
4820
4821 unsigned long timeout;
4822 u16 count = TESTFRAMESIZE;
4823 unsigned char buf[TESTFRAMESIZE];
4824 int rc = -ENODEV;
4825 unsigned long flags;
4826
4827 struct tty_struct *oldtty = info->port.tty;
4828 MGSL_PARAMS params;
4829
4830 memcpy(&params, &info->params, sizeof(params));
4831
4832 info->params.mode = MGSL_MODE_ASYNC;
4833 info->params.data_rate = 921600;
4834 info->params.loopback = 1;
4835 info->port.tty = NULL;
4836
4837 /* build and send transmit frame */
4838 for (count = 0; count < TESTFRAMESIZE; ++count)
4839 buf[count] = (unsigned char)count;
4840
4841 info->tmp_rbuf_count = 0;
4842 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4843
4844 /* program hardware for HDLC and enabled receiver */
4845 spin_lock_irqsave(&info->lock,flags);
4846 async_mode(info);
4847 rx_start(info);
4848 info->tx_count = count;
4849 tx_load(info, buf, count);
4850 tx_start(info);
4851 spin_unlock_irqrestore(&info->lock, flags);
4852
4853 /* wait for receive complete */
4854 for (timeout = 100; timeout; --timeout) {
4855 msleep_interruptible(10);
4856 if (loopback_test_rx(info)) {
4857 rc = 0;
4858 break;
4859 }
4860 }
4861
4862 /* verify received frame length and contents */
4863 if (!rc && (info->tmp_rbuf_count != count ||
4864 memcmp(buf, info->tmp_rbuf, count))) {
4865 rc = -ENODEV;
4866 }
4867
4868 spin_lock_irqsave(&info->lock,flags);
4869 reset_adapter(info);
4870 spin_unlock_irqrestore(&info->lock,flags);
4871
4872 memcpy(&info->params, &params, sizeof(info->params));
4873 info->port.tty = oldtty;
4874
4875 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4876 return rc;
4877 }
4878
4879 static int adapter_test(struct slgt_info *info)
4880 {
4881 DBGINFO(("testing %s\n", info->device_name));
4882 if (register_test(info) < 0) {
4883 printk("register test failure %s addr=%08X\n",
4884 info->device_name, info->phys_reg_addr);
4885 } else if (irq_test(info) < 0) {
4886 printk("IRQ test failure %s IRQ=%d\n",
4887 info->device_name, info->irq_level);
4888 } else if (loopback_test(info) < 0) {
4889 printk("loopback test failure %s\n", info->device_name);
4890 }
4891 return info->init_error;
4892 }
4893
4894 /*
4895 * transmit timeout handler
4896 */
4897 static void tx_timeout(unsigned long context)
4898 {
4899 struct slgt_info *info = (struct slgt_info*)context;
4900 unsigned long flags;
4901
4902 DBGINFO(("%s tx_timeout\n", info->device_name));
4903 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4904 info->icount.txtimeout++;
4905 }
4906 spin_lock_irqsave(&info->lock,flags);
4907 info->tx_active = false;
4908 info->tx_count = 0;
4909 spin_unlock_irqrestore(&info->lock,flags);
4910
4911 #if SYNCLINK_GENERIC_HDLC
4912 if (info->netcount)
4913 hdlcdev_tx_done(info);
4914 else
4915 #endif
4916 bh_transmit(info);
4917 }
4918
4919 /*
4920 * receive buffer polling timer
4921 */
4922 static void rx_timeout(unsigned long context)
4923 {
4924 struct slgt_info *info = (struct slgt_info*)context;
4925 unsigned long flags;
4926
4927 DBGINFO(("%s rx_timeout\n", info->device_name));
4928 spin_lock_irqsave(&info->lock, flags);
4929 info->pending_bh |= BH_RECEIVE;
4930 spin_unlock_irqrestore(&info->lock, flags);
4931 bh_handler(&info->task);
4932 }
4933
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