Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * esp.c - driver for Hayes ESP serial cards | |
3 | * | |
4 | * --- Notices from serial.c, upon which this driver is based --- | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * | |
8 | * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now | |
9 | * much more extensible to support other serial cards based on the | |
10 | * 16450/16550A UART's. Added support for the AST FourPort and the | |
11 | * Accent Async board. | |
12 | * | |
13 | * set_serial_info fixed to set the flags, custom divisor, and uart | |
14 | * type fields. Fix suggested by Michael K. Johnson 12/12/92. | |
15 | * | |
16 | * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk> | |
17 | * | |
18 | * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk> | |
19 | * | |
20 | * rs_set_termios fixed to look also for changes of the input | |
21 | * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK. | |
22 | * Bernd Anh�pl 05/17/96. | |
23 | * | |
24 | * --- End of notices from serial.c --- | |
25 | * | |
26 | * Support for the ESP serial card by Andrew J. Robinson | |
27 | * <arobinso@nyx.net> (Card detection routine taken from a patch | |
28 | * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed | |
29 | * by Chris Faylor. | |
30 | * | |
31 | * Most recent changes: (Andrew J. Robinson) | |
32 | * Support for PIO mode. This allows the driver to work properly with | |
33 | * multiport cards. | |
34 | * | |
35 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - | |
36 | * several cleanups, use module_init/module_exit, etc | |
37 | * | |
38 | * This module exports the following rs232 io functions: | |
39 | * | |
40 | * int espserial_init(void); | |
41 | */ | |
42 | ||
43 | #include <linux/module.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/signal.h> | |
46 | #include <linux/sched.h> | |
47 | #include <linux/interrupt.h> | |
48 | #include <linux/tty.h> | |
49 | #include <linux/tty_flip.h> | |
50 | #include <linux/serial.h> | |
51 | #include <linux/serialP.h> | |
52 | #include <linux/serial_reg.h> | |
53 | #include <linux/major.h> | |
54 | #include <linux/string.h> | |
55 | #include <linux/fcntl.h> | |
56 | #include <linux/ptrace.h> | |
57 | #include <linux/ioport.h> | |
58 | #include <linux/mm.h> | |
59 | #include <linux/init.h> | |
60 | #include <linux/delay.h> | |
61 | ||
62 | #include <asm/system.h> | |
63 | #include <asm/io.h> | |
64 | #include <asm/bitops.h> | |
65 | ||
66 | #include <asm/dma.h> | |
67 | #include <linux/slab.h> | |
68 | #include <asm/uaccess.h> | |
69 | ||
70 | #include <linux/hayesesp.h> | |
71 | ||
72 | #define NR_PORTS 64 /* maximum number of ports */ | |
73 | #define NR_PRIMARY 8 /* maximum number of primary ports */ | |
74 | #define REGION_SIZE 8 /* size of io region to request */ | |
75 | ||
76 | /* The following variables can be set by giving module options */ | |
77 | static int irq[NR_PRIMARY]; /* IRQ for each base port */ | |
78 | static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */ | |
79 | static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */ | |
80 | static unsigned int rx_trigger = ESP_RX_TRIGGER; | |
81 | static unsigned int tx_trigger = ESP_TX_TRIGGER; | |
82 | static unsigned int flow_off = ESP_FLOW_OFF; | |
83 | static unsigned int flow_on = ESP_FLOW_ON; | |
84 | static unsigned int rx_timeout = ESP_RX_TMOUT; | |
85 | static unsigned int pio_threshold = ESP_PIO_THRESHOLD; | |
86 | ||
87 | MODULE_LICENSE("GPL"); | |
88 | ||
89 | module_param_array(irq, int, NULL, 0); | |
90 | module_param_array(divisor, uint, NULL, 0); | |
91 | module_param(dma, uint, 0); | |
92 | module_param(rx_trigger, uint, 0); | |
93 | module_param(tx_trigger, uint, 0); | |
94 | module_param(flow_off, uint, 0); | |
95 | module_param(flow_on, uint, 0); | |
96 | module_param(rx_timeout, uint, 0); | |
97 | module_param(pio_threshold, uint, 0); | |
98 | ||
99 | /* END */ | |
100 | ||
101 | static char *dma_buffer; | |
102 | static int dma_bytes; | |
103 | static struct esp_pio_buffer *free_pio_buf; | |
104 | ||
105 | #define DMA_BUFFER_SZ 1024 | |
106 | ||
107 | #define WAKEUP_CHARS 1024 | |
108 | ||
109 | static char serial_name[] __initdata = "ESP serial driver"; | |
110 | static char serial_version[] __initdata = "2.2"; | |
111 | ||
112 | static struct tty_driver *esp_driver; | |
113 | ||
114 | /* serial subtype definitions */ | |
115 | #define SERIAL_TYPE_NORMAL 1 | |
116 | ||
117 | /* | |
118 | * Serial driver configuration section. Here are the various options: | |
119 | * | |
120 | * SERIAL_PARANOIA_CHECK | |
121 | * Check the magic number for the esp_structure where | |
122 | * ever possible. | |
123 | */ | |
124 | ||
125 | #undef SERIAL_PARANOIA_CHECK | |
126 | #define SERIAL_DO_RESTART | |
127 | ||
128 | #undef SERIAL_DEBUG_INTR | |
129 | #undef SERIAL_DEBUG_OPEN | |
130 | #undef SERIAL_DEBUG_FLOW | |
131 | ||
132 | #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) | |
133 | #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ | |
134 | tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s) | |
135 | #else | |
136 | #define DBG_CNT(s) | |
137 | #endif | |
138 | ||
139 | static struct esp_struct *ports; | |
140 | ||
141 | static void change_speed(struct esp_struct *info); | |
142 | static void rs_wait_until_sent(struct tty_struct *, int); | |
143 | ||
144 | /* | |
145 | * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE | |
146 | * times the normal 1.8432 Mhz clock of most serial boards). | |
147 | */ | |
148 | #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE)) | |
149 | ||
150 | /* Standard COM flags (except for COM4, because of the 8514 problem) */ | |
151 | #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) | |
152 | ||
153 | /* | |
154 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
155 | * lock it in case the memcpy_fromfs blocks while swapping in a page, | |
156 | * and some other program tries to do a serial write at the same time. | |
157 | * Since the lock will only come under contention when the system is | |
158 | * swapping and available memory is low, it makes sense to share one | |
159 | * buffer across all the serial ports, since it significantly saves | |
160 | * memory if large numbers of serial ports are open. | |
161 | */ | |
162 | static unsigned char *tmp_buf; | |
163 | static DECLARE_MUTEX(tmp_buf_sem); | |
164 | ||
165 | static inline int serial_paranoia_check(struct esp_struct *info, | |
166 | char *name, const char *routine) | |
167 | { | |
168 | #ifdef SERIAL_PARANOIA_CHECK | |
169 | static const char badmagic[] = KERN_WARNING | |
170 | "Warning: bad magic number for serial struct (%s) in %s\n"; | |
171 | static const char badinfo[] = KERN_WARNING | |
172 | "Warning: null esp_struct for (%s) in %s\n"; | |
173 | ||
174 | if (!info) { | |
175 | printk(badinfo, name, routine); | |
176 | return 1; | |
177 | } | |
178 | if (info->magic != ESP_MAGIC) { | |
179 | printk(badmagic, name, routine); | |
180 | return 1; | |
181 | } | |
182 | #endif | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static inline unsigned int serial_in(struct esp_struct *info, int offset) | |
187 | { | |
188 | return inb(info->port + offset); | |
189 | } | |
190 | ||
191 | static inline void serial_out(struct esp_struct *info, int offset, | |
192 | unsigned char value) | |
193 | { | |
194 | outb(value, info->port+offset); | |
195 | } | |
196 | ||
197 | /* | |
198 | * ------------------------------------------------------------ | |
199 | * rs_stop() and rs_start() | |
200 | * | |
201 | * This routines are called before setting or resetting tty->stopped. | |
202 | * They enable or disable transmitter interrupts, as necessary. | |
203 | * ------------------------------------------------------------ | |
204 | */ | |
205 | static void rs_stop(struct tty_struct *tty) | |
206 | { | |
207 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
208 | unsigned long flags; | |
209 | ||
210 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
211 | return; | |
212 | ||
213 | spin_lock_irqsave(&info->lock, flags); | |
214 | if (info->IER & UART_IER_THRI) { | |
215 | info->IER &= ~UART_IER_THRI; | |
216 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
217 | serial_out(info, UART_ESI_CMD2, info->IER); | |
218 | } | |
219 | spin_unlock_irqrestore(&info->lock, flags); | |
220 | } | |
221 | ||
222 | static void rs_start(struct tty_struct *tty) | |
223 | { | |
224 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
225 | unsigned long flags; | |
226 | ||
227 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
228 | return; | |
229 | ||
230 | spin_lock_irqsave(&info->lock, flags); | |
231 | if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { | |
232 | info->IER |= UART_IER_THRI; | |
233 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
234 | serial_out(info, UART_ESI_CMD2, info->IER); | |
235 | } | |
236 | spin_unlock_irqrestore(&info->lock, flags); | |
237 | } | |
238 | ||
239 | /* | |
240 | * ---------------------------------------------------------------------- | |
241 | * | |
242 | * Here starts the interrupt handling routines. All of the following | |
243 | * subroutines are declared as inline and are folded into | |
244 | * rs_interrupt(). They were separated out for readability's sake. | |
245 | * | |
246 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
247 | * runs with interrupts turned off. People who may want to modify | |
248 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
249 | * possible. After you are done making modifications, it is not a bad | |
250 | * idea to do: | |
251 | * | |
252 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
253 | * | |
254 | * and look at the resulting assemble code in serial.s. | |
255 | * | |
256 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
257 | * ----------------------------------------------------------------------- | |
258 | */ | |
259 | ||
260 | /* | |
261 | * This routine is used by the interrupt handler to schedule | |
262 | * processing in the software interrupt portion of the driver. | |
263 | */ | |
264 | static inline void rs_sched_event(struct esp_struct *info, | |
265 | int event) | |
266 | { | |
267 | info->event |= 1 << event; | |
268 | schedule_work(&info->tqueue); | |
269 | } | |
270 | ||
271 | static DEFINE_SPINLOCK(pio_lock); | |
272 | ||
273 | static inline struct esp_pio_buffer *get_pio_buffer(void) | |
274 | { | |
275 | struct esp_pio_buffer *buf; | |
276 | unsigned long flags; | |
277 | ||
278 | spin_lock_irqsave(&pio_lock, flags); | |
279 | if (free_pio_buf) { | |
280 | buf = free_pio_buf; | |
281 | free_pio_buf = buf->next; | |
282 | } else { | |
283 | buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC); | |
284 | } | |
285 | spin_unlock_irqrestore(&pio_lock, flags); | |
286 | return buf; | |
287 | } | |
288 | ||
289 | static inline void release_pio_buffer(struct esp_pio_buffer *buf) | |
290 | { | |
291 | unsigned long flags; | |
292 | spin_lock_irqsave(&pio_lock, flags); | |
293 | buf->next = free_pio_buf; | |
294 | free_pio_buf = buf; | |
295 | spin_unlock_irqrestore(&pio_lock, flags); | |
296 | } | |
297 | ||
298 | static inline void receive_chars_pio(struct esp_struct *info, int num_bytes) | |
299 | { | |
300 | struct tty_struct *tty = info->tty; | |
301 | int i; | |
302 | struct esp_pio_buffer *pio_buf; | |
303 | struct esp_pio_buffer *err_buf; | |
304 | unsigned char status_mask; | |
305 | ||
306 | pio_buf = get_pio_buffer(); | |
307 | ||
308 | if (!pio_buf) | |
309 | return; | |
310 | ||
311 | err_buf = get_pio_buffer(); | |
312 | ||
313 | if (!err_buf) { | |
314 | release_pio_buffer(pio_buf); | |
315 | return; | |
316 | } | |
317 | ||
318 | status_mask = (info->read_status_mask >> 2) & 0x07; | |
319 | ||
320 | for (i = 0; i < num_bytes - 1; i += 2) { | |
321 | *((unsigned short *)(pio_buf->data + i)) = | |
322 | inw(info->port + UART_ESI_RX); | |
323 | err_buf->data[i] = serial_in(info, UART_ESI_RWS); | |
324 | err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask; | |
325 | err_buf->data[i] &= status_mask; | |
326 | } | |
327 | ||
328 | if (num_bytes & 0x0001) { | |
329 | pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX); | |
330 | err_buf->data[num_bytes - 1] = | |
331 | (serial_in(info, UART_ESI_RWS) >> 3) & status_mask; | |
332 | } | |
333 | ||
334 | /* make sure everything is still ok since interrupts were enabled */ | |
335 | tty = info->tty; | |
336 | ||
337 | if (!tty) { | |
338 | release_pio_buffer(pio_buf); | |
339 | release_pio_buffer(err_buf); | |
340 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
341 | return; | |
342 | } | |
343 | ||
344 | status_mask = (info->ignore_status_mask >> 2) & 0x07; | |
345 | ||
346 | for (i = 0; i < num_bytes; i++) { | |
347 | if (!(err_buf->data[i] & status_mask)) { | |
33f0f88f | 348 | int flag = 0; |
1da177e4 LT |
349 | |
350 | if (err_buf->data[i] & 0x04) { | |
33f0f88f | 351 | flag = TTY_BREAK; |
1da177e4 LT |
352 | if (info->flags & ASYNC_SAK) |
353 | do_SAK(tty); | |
354 | } | |
355 | else if (err_buf->data[i] & 0x02) | |
33f0f88f | 356 | flag = TTY_FRAME; |
1da177e4 | 357 | else if (err_buf->data[i] & 0x01) |
33f0f88f AC |
358 | flag = TTY_PARITY; |
359 | tty_insert_flip_char(tty, pio_buf->data[i], flag); | |
1da177e4 LT |
360 | } |
361 | } | |
362 | ||
33f0f88f | 363 | schedule_delayed_work(&tty->buf.work, 1); |
1da177e4 LT |
364 | |
365 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
366 | release_pio_buffer(pio_buf); | |
367 | release_pio_buffer(err_buf); | |
368 | } | |
369 | ||
370 | static inline void receive_chars_dma(struct esp_struct *info, int num_bytes) | |
371 | { | |
372 | unsigned long flags; | |
373 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
374 | dma_bytes = num_bytes; | |
375 | info->stat_flags |= ESP_STAT_DMA_RX; | |
376 | ||
377 | flags=claim_dma_lock(); | |
378 | disable_dma(dma); | |
379 | clear_dma_ff(dma); | |
380 | set_dma_mode(dma, DMA_MODE_READ); | |
381 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
382 | set_dma_count(dma, dma_bytes); | |
383 | enable_dma(dma); | |
384 | release_dma_lock(flags); | |
385 | ||
386 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX); | |
387 | } | |
388 | ||
389 | static inline void receive_chars_dma_done(struct esp_struct *info, | |
390 | int status) | |
391 | { | |
392 | struct tty_struct *tty = info->tty; | |
393 | int num_bytes; | |
394 | unsigned long flags; | |
395 | ||
1da177e4 LT |
396 | flags=claim_dma_lock(); |
397 | disable_dma(dma); | |
398 | clear_dma_ff(dma); | |
399 | ||
400 | info->stat_flags &= ~ESP_STAT_DMA_RX; | |
401 | num_bytes = dma_bytes - get_dma_residue(dma); | |
402 | release_dma_lock(flags); | |
403 | ||
404 | info->icount.rx += num_bytes; | |
405 | ||
1da177e4 | 406 | if (num_bytes > 0) { |
33f0f88f | 407 | tty_insert_flip_string(tty, dma_buffer, num_bytes - 1); |
1da177e4 LT |
408 | |
409 | status &= (0x1c & info->read_status_mask); | |
33f0f88f AC |
410 | |
411 | /* Is the status significant or do we throw the last byte ? */ | |
412 | if (!(status & info->ignore_status_mask)) { | |
413 | int statflag = 0; | |
1da177e4 | 414 | |
33f0f88f AC |
415 | if (status & 0x10) { |
416 | statflag = TTY_BREAK; | |
417 | (info->icount.brk)++; | |
418 | if (info->flags & ASYNC_SAK) | |
419 | do_SAK(tty); | |
420 | } else if (status & 0x08) { | |
421 | statflag = TTY_FRAME; | |
422 | (info->icount.frame)++; | |
423 | } | |
424 | else if (status & 0x04) { | |
425 | statflag = TTY_PARITY; | |
426 | (info->icount.parity)++; | |
427 | } | |
428 | tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag); | |
1da177e4 | 429 | } |
33f0f88f | 430 | schedule_delayed_work(&tty->buf.work, 1); |
1da177e4 LT |
431 | } |
432 | ||
433 | if (dma_bytes != num_bytes) { | |
434 | num_bytes = dma_bytes - num_bytes; | |
435 | dma_bytes = 0; | |
436 | receive_chars_dma(info, num_bytes); | |
437 | } else | |
438 | dma_bytes = 0; | |
439 | } | |
440 | ||
441 | /* Caller must hold info->lock */ | |
442 | ||
443 | static inline void transmit_chars_pio(struct esp_struct *info, | |
444 | int space_avail) | |
445 | { | |
446 | int i; | |
447 | struct esp_pio_buffer *pio_buf; | |
448 | ||
449 | pio_buf = get_pio_buffer(); | |
450 | ||
451 | if (!pio_buf) | |
452 | return; | |
453 | ||
454 | while (space_avail && info->xmit_cnt) { | |
455 | if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) { | |
456 | memcpy(pio_buf->data, | |
457 | &(info->xmit_buf[info->xmit_tail]), | |
458 | space_avail); | |
459 | } else { | |
460 | i = ESP_XMIT_SIZE - info->xmit_tail; | |
461 | memcpy(pio_buf->data, | |
462 | &(info->xmit_buf[info->xmit_tail]), i); | |
463 | memcpy(&(pio_buf->data[i]), info->xmit_buf, | |
464 | space_avail - i); | |
465 | } | |
466 | ||
467 | info->xmit_cnt -= space_avail; | |
468 | info->xmit_tail = (info->xmit_tail + space_avail) & | |
469 | (ESP_XMIT_SIZE - 1); | |
470 | ||
471 | for (i = 0; i < space_avail - 1; i += 2) { | |
472 | outw(*((unsigned short *)(pio_buf->data + i)), | |
473 | info->port + UART_ESI_TX); | |
474 | } | |
475 | ||
476 | if (space_avail & 0x0001) | |
477 | serial_out(info, UART_ESI_TX, | |
478 | pio_buf->data[space_avail - 1]); | |
479 | ||
480 | if (info->xmit_cnt) { | |
481 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
482 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
483 | space_avail = serial_in(info, UART_ESI_STAT1) << 8; | |
484 | space_avail |= serial_in(info, UART_ESI_STAT2); | |
485 | ||
486 | if (space_avail > info->xmit_cnt) | |
487 | space_avail = info->xmit_cnt; | |
488 | } | |
489 | } | |
490 | ||
491 | if (info->xmit_cnt < WAKEUP_CHARS) { | |
492 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); | |
493 | ||
494 | #ifdef SERIAL_DEBUG_INTR | |
495 | printk("THRE..."); | |
496 | #endif | |
497 | ||
498 | if (info->xmit_cnt <= 0) { | |
499 | info->IER &= ~UART_IER_THRI; | |
500 | serial_out(info, UART_ESI_CMD1, | |
501 | ESI_SET_SRV_MASK); | |
502 | serial_out(info, UART_ESI_CMD2, info->IER); | |
503 | } | |
504 | } | |
505 | ||
506 | release_pio_buffer(pio_buf); | |
507 | } | |
508 | ||
509 | /* Caller must hold info->lock */ | |
510 | static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes) | |
511 | { | |
512 | unsigned long flags; | |
513 | ||
514 | dma_bytes = num_bytes; | |
515 | ||
516 | if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) { | |
517 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), | |
518 | dma_bytes); | |
519 | } else { | |
520 | int i = ESP_XMIT_SIZE - info->xmit_tail; | |
521 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), | |
522 | i); | |
523 | memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i); | |
524 | } | |
525 | ||
526 | info->xmit_cnt -= dma_bytes; | |
527 | info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1); | |
528 | ||
529 | if (info->xmit_cnt < WAKEUP_CHARS) { | |
530 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); | |
531 | ||
532 | #ifdef SERIAL_DEBUG_INTR | |
533 | printk("THRE..."); | |
534 | #endif | |
535 | ||
536 | if (info->xmit_cnt <= 0) { | |
537 | info->IER &= ~UART_IER_THRI; | |
538 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
539 | serial_out(info, UART_ESI_CMD2, info->IER); | |
540 | } | |
541 | } | |
542 | ||
543 | info->stat_flags |= ESP_STAT_DMA_TX; | |
544 | ||
545 | flags=claim_dma_lock(); | |
546 | disable_dma(dma); | |
547 | clear_dma_ff(dma); | |
548 | set_dma_mode(dma, DMA_MODE_WRITE); | |
549 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
550 | set_dma_count(dma, dma_bytes); | |
551 | enable_dma(dma); | |
552 | release_dma_lock(flags); | |
553 | ||
554 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); | |
555 | } | |
556 | ||
557 | static inline void transmit_chars_dma_done(struct esp_struct *info) | |
558 | { | |
559 | int num_bytes; | |
560 | unsigned long flags; | |
561 | ||
562 | ||
563 | flags=claim_dma_lock(); | |
564 | disable_dma(dma); | |
565 | clear_dma_ff(dma); | |
566 | ||
567 | num_bytes = dma_bytes - get_dma_residue(dma); | |
568 | info->icount.tx += dma_bytes; | |
569 | release_dma_lock(flags); | |
570 | ||
571 | if (dma_bytes != num_bytes) { | |
572 | dma_bytes -= num_bytes; | |
573 | memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes); | |
574 | ||
575 | flags=claim_dma_lock(); | |
576 | disable_dma(dma); | |
577 | clear_dma_ff(dma); | |
578 | set_dma_mode(dma, DMA_MODE_WRITE); | |
579 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
580 | set_dma_count(dma, dma_bytes); | |
581 | enable_dma(dma); | |
582 | release_dma_lock(flags); | |
583 | ||
584 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); | |
585 | } else { | |
586 | dma_bytes = 0; | |
587 | info->stat_flags &= ~ESP_STAT_DMA_TX; | |
588 | } | |
589 | } | |
590 | ||
591 | static inline void check_modem_status(struct esp_struct *info) | |
592 | { | |
593 | int status; | |
594 | ||
595 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
596 | status = serial_in(info, UART_ESI_STAT2); | |
597 | ||
598 | if (status & UART_MSR_ANY_DELTA) { | |
599 | /* update input line counters */ | |
600 | if (status & UART_MSR_TERI) | |
601 | info->icount.rng++; | |
602 | if (status & UART_MSR_DDSR) | |
603 | info->icount.dsr++; | |
604 | if (status & UART_MSR_DDCD) | |
605 | info->icount.dcd++; | |
606 | if (status & UART_MSR_DCTS) | |
607 | info->icount.cts++; | |
608 | wake_up_interruptible(&info->delta_msr_wait); | |
609 | } | |
610 | ||
611 | if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { | |
612 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) | |
613 | printk("ttys%d CD now %s...", info->line, | |
614 | (status & UART_MSR_DCD) ? "on" : "off"); | |
615 | #endif | |
616 | if (status & UART_MSR_DCD) | |
617 | wake_up_interruptible(&info->open_wait); | |
618 | else { | |
619 | #ifdef SERIAL_DEBUG_OPEN | |
620 | printk("scheduling hangup..."); | |
621 | #endif | |
622 | schedule_work(&info->tqueue_hangup); | |
623 | } | |
624 | } | |
625 | } | |
626 | ||
627 | /* | |
628 | * This is the serial driver's interrupt routine | |
629 | */ | |
630 | static irqreturn_t rs_interrupt_single(int irq, void *dev_id, | |
631 | struct pt_regs *regs) | |
632 | { | |
633 | struct esp_struct * info; | |
634 | unsigned err_status; | |
635 | unsigned int scratch; | |
636 | ||
637 | #ifdef SERIAL_DEBUG_INTR | |
638 | printk("rs_interrupt_single(%d)...", irq); | |
639 | #endif | |
640 | info = (struct esp_struct *)dev_id; | |
641 | err_status = 0; | |
642 | scratch = serial_in(info, UART_ESI_SID); | |
643 | ||
644 | spin_lock(&info->lock); | |
645 | ||
646 | if (!info->tty) { | |
647 | spin_unlock(&info->lock); | |
648 | return IRQ_NONE; | |
649 | } | |
650 | ||
651 | if (scratch & 0x04) { /* error */ | |
652 | serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT); | |
653 | err_status = serial_in(info, UART_ESI_STAT1); | |
654 | serial_in(info, UART_ESI_STAT2); | |
655 | ||
656 | if (err_status & 0x01) | |
657 | info->stat_flags |= ESP_STAT_RX_TIMEOUT; | |
658 | ||
659 | if (err_status & 0x20) /* UART status */ | |
660 | check_modem_status(info); | |
661 | ||
662 | if (err_status & 0x80) /* Start break */ | |
663 | wake_up_interruptible(&info->break_wait); | |
664 | } | |
665 | ||
666 | if ((scratch & 0x88) || /* DMA completed or timed out */ | |
667 | (err_status & 0x1c) /* receive error */) { | |
668 | if (info->stat_flags & ESP_STAT_DMA_RX) | |
669 | receive_chars_dma_done(info, err_status); | |
670 | else if (info->stat_flags & ESP_STAT_DMA_TX) | |
671 | transmit_chars_dma_done(info); | |
672 | } | |
673 | ||
674 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && | |
675 | ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) && | |
676 | (info->IER & UART_IER_RDI)) { | |
677 | int num_bytes; | |
678 | ||
679 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
680 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); | |
681 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; | |
682 | num_bytes |= serial_in(info, UART_ESI_STAT2); | |
683 | ||
33f0f88f | 684 | num_bytes = tty_buffer_request_room(info->tty, num_bytes); |
1da177e4 LT |
685 | |
686 | if (num_bytes) { | |
687 | if (dma_bytes || | |
688 | (info->stat_flags & ESP_STAT_USE_PIO) || | |
689 | (num_bytes <= info->config.pio_threshold)) | |
690 | receive_chars_pio(info, num_bytes); | |
691 | else | |
692 | receive_chars_dma(info, num_bytes); | |
693 | } | |
694 | } | |
695 | ||
696 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && | |
697 | (scratch & 0x02) && (info->IER & UART_IER_THRI)) { | |
698 | if ((info->xmit_cnt <= 0) || info->tty->stopped) { | |
699 | info->IER &= ~UART_IER_THRI; | |
700 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
701 | serial_out(info, UART_ESI_CMD2, info->IER); | |
702 | } else { | |
703 | int num_bytes; | |
704 | ||
705 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
706 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
707 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; | |
708 | num_bytes |= serial_in(info, UART_ESI_STAT2); | |
709 | ||
710 | if (num_bytes > info->xmit_cnt) | |
711 | num_bytes = info->xmit_cnt; | |
712 | ||
713 | if (num_bytes) { | |
714 | if (dma_bytes || | |
715 | (info->stat_flags & ESP_STAT_USE_PIO) || | |
716 | (num_bytes <= info->config.pio_threshold)) | |
717 | transmit_chars_pio(info, num_bytes); | |
718 | else | |
719 | transmit_chars_dma(info, num_bytes); | |
720 | } | |
721 | } | |
722 | } | |
723 | ||
724 | info->last_active = jiffies; | |
725 | ||
726 | #ifdef SERIAL_DEBUG_INTR | |
727 | printk("end.\n"); | |
728 | #endif | |
729 | spin_unlock(&info->lock); | |
730 | return IRQ_HANDLED; | |
731 | } | |
732 | ||
733 | /* | |
734 | * ------------------------------------------------------------------- | |
735 | * Here ends the serial interrupt routines. | |
736 | * ------------------------------------------------------------------- | |
737 | */ | |
738 | ||
739 | static void do_softint(void *private_) | |
740 | { | |
741 | struct esp_struct *info = (struct esp_struct *) private_; | |
742 | struct tty_struct *tty; | |
743 | ||
744 | tty = info->tty; | |
745 | if (!tty) | |
746 | return; | |
747 | ||
748 | if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) { | |
749 | tty_wakeup(tty); | |
750 | } | |
751 | } | |
752 | ||
753 | /* | |
754 | * This routine is called from the scheduler tqueue when the interrupt | |
755 | * routine has signalled that a hangup has occurred. The path of | |
756 | * hangup processing is: | |
757 | * | |
758 | * serial interrupt routine -> (scheduler tqueue) -> | |
759 | * do_serial_hangup() -> tty->hangup() -> esp_hangup() | |
760 | * | |
761 | */ | |
762 | static void do_serial_hangup(void *private_) | |
763 | { | |
764 | struct esp_struct *info = (struct esp_struct *) private_; | |
765 | struct tty_struct *tty; | |
766 | ||
767 | tty = info->tty; | |
768 | if (tty) | |
769 | tty_hangup(tty); | |
770 | } | |
771 | ||
772 | /* | |
773 | * --------------------------------------------------------------- | |
774 | * Low level utility subroutines for the serial driver: routines to | |
775 | * figure out the appropriate timeout for an interrupt chain, routines | |
776 | * to initialize and startup a serial port, and routines to shutdown a | |
777 | * serial port. Useful stuff like that. | |
778 | * | |
779 | * Caller should hold lock | |
780 | * --------------------------------------------------------------- | |
781 | */ | |
782 | ||
783 | static inline void esp_basic_init(struct esp_struct * info) | |
784 | { | |
785 | /* put ESPC in enhanced mode */ | |
786 | serial_out(info, UART_ESI_CMD1, ESI_SET_MODE); | |
787 | ||
788 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
789 | serial_out(info, UART_ESI_CMD2, 0x01); | |
790 | else | |
791 | serial_out(info, UART_ESI_CMD2, 0x31); | |
792 | ||
793 | /* disable interrupts for now */ | |
794 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
795 | serial_out(info, UART_ESI_CMD2, 0x00); | |
796 | ||
797 | /* set interrupt and DMA channel */ | |
798 | serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ); | |
799 | ||
800 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
801 | serial_out(info, UART_ESI_CMD2, 0x01); | |
802 | else | |
803 | serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01); | |
804 | ||
805 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); | |
806 | ||
807 | if (info->line % 8) /* secondary port */ | |
808 | serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */ | |
809 | else if (info->irq == 9) | |
810 | serial_out(info, UART_ESI_CMD2, 0x02); | |
811 | else | |
812 | serial_out(info, UART_ESI_CMD2, info->irq); | |
813 | ||
814 | /* set error status mask (check this) */ | |
815 | serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK); | |
816 | ||
817 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
818 | serial_out(info, UART_ESI_CMD2, 0xa1); | |
819 | else | |
820 | serial_out(info, UART_ESI_CMD2, 0xbd); | |
821 | ||
822 | serial_out(info, UART_ESI_CMD2, 0x00); | |
823 | ||
824 | /* set DMA timeout */ | |
825 | serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT); | |
826 | serial_out(info, UART_ESI_CMD2, 0xff); | |
827 | ||
828 | /* set FIFO trigger levels */ | |
829 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); | |
830 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8); | |
831 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger); | |
832 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8); | |
833 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger); | |
834 | ||
835 | /* Set clock scaling and wait states */ | |
836 | serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR); | |
837 | serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE); | |
838 | ||
839 | /* set reinterrupt pacing */ | |
840 | serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR); | |
841 | serial_out(info, UART_ESI_CMD2, 0xff); | |
842 | } | |
843 | ||
844 | static int startup(struct esp_struct * info) | |
845 | { | |
846 | unsigned long flags; | |
847 | int retval=0; | |
848 | unsigned int num_chars; | |
849 | ||
850 | spin_lock_irqsave(&info->lock, flags); | |
851 | ||
852 | if (info->flags & ASYNC_INITIALIZED) | |
853 | goto out; | |
854 | ||
855 | if (!info->xmit_buf) { | |
856 | info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC); | |
857 | retval = -ENOMEM; | |
858 | if (!info->xmit_buf) | |
859 | goto out; | |
860 | } | |
861 | ||
862 | #ifdef SERIAL_DEBUG_OPEN | |
863 | printk("starting up ttys%d (irq %d)...", info->line, info->irq); | |
864 | #endif | |
865 | ||
866 | /* Flush the RX buffer. Using the ESI flush command may cause */ | |
867 | /* wild interrupts, so read all the data instead. */ | |
868 | ||
869 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
870 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); | |
871 | num_chars = serial_in(info, UART_ESI_STAT1) << 8; | |
872 | num_chars |= serial_in(info, UART_ESI_STAT2); | |
873 | ||
874 | while (num_chars > 1) { | |
875 | inw(info->port + UART_ESI_RX); | |
876 | num_chars -= 2; | |
877 | } | |
878 | ||
879 | if (num_chars) | |
880 | serial_in(info, UART_ESI_RX); | |
881 | ||
882 | /* set receive character timeout */ | |
883 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
884 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); | |
885 | ||
886 | /* clear all flags except the "never DMA" flag */ | |
887 | info->stat_flags &= ESP_STAT_NEVER_DMA; | |
888 | ||
889 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
890 | info->stat_flags |= ESP_STAT_USE_PIO; | |
891 | ||
892 | spin_unlock_irqrestore(&info->lock, flags); | |
893 | ||
894 | /* | |
895 | * Allocate the IRQ | |
896 | */ | |
897 | ||
898 | retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ, | |
899 | "esp serial", info); | |
900 | ||
901 | if (retval) { | |
902 | if (capable(CAP_SYS_ADMIN)) { | |
903 | if (info->tty) | |
904 | set_bit(TTY_IO_ERROR, | |
905 | &info->tty->flags); | |
906 | retval = 0; | |
907 | } | |
908 | goto out_unlocked; | |
909 | } | |
910 | ||
911 | if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) { | |
912 | dma_buffer = (char *)__get_dma_pages( | |
913 | GFP_KERNEL, get_order(DMA_BUFFER_SZ)); | |
914 | ||
915 | /* use PIO mode if DMA buf/chan cannot be allocated */ | |
916 | if (!dma_buffer) | |
917 | info->stat_flags |= ESP_STAT_USE_PIO; | |
918 | else if (request_dma(dma, "esp serial")) { | |
919 | free_pages((unsigned long)dma_buffer, | |
920 | get_order(DMA_BUFFER_SZ)); | |
921 | dma_buffer = NULL; | |
922 | info->stat_flags |= ESP_STAT_USE_PIO; | |
923 | } | |
924 | ||
925 | } | |
926 | ||
927 | info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2; | |
928 | ||
929 | spin_lock_irqsave(&info->lock, flags); | |
930 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
931 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
932 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
933 | ||
934 | /* | |
935 | * Finally, enable interrupts | |
936 | */ | |
937 | /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */ | |
938 | info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT | | |
939 | UART_IER_DMA_TC; | |
940 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
941 | serial_out(info, UART_ESI_CMD2, info->IER); | |
942 | ||
943 | if (info->tty) | |
944 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
945 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
946 | spin_unlock_irqrestore(&info->lock, flags); | |
947 | ||
948 | /* | |
949 | * Set up the tty->alt_speed kludge | |
950 | */ | |
951 | if (info->tty) { | |
952 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
953 | info->tty->alt_speed = 57600; | |
954 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
955 | info->tty->alt_speed = 115200; | |
956 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
957 | info->tty->alt_speed = 230400; | |
958 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
959 | info->tty->alt_speed = 460800; | |
960 | } | |
961 | ||
962 | /* | |
963 | * set the speed of the serial port | |
964 | */ | |
965 | change_speed(info); | |
966 | info->flags |= ASYNC_INITIALIZED; | |
967 | return 0; | |
968 | ||
969 | out: | |
970 | spin_unlock_irqrestore(&info->lock, flags); | |
971 | out_unlocked: | |
972 | return retval; | |
973 | } | |
974 | ||
975 | /* | |
976 | * This routine will shutdown a serial port; interrupts are disabled, and | |
977 | * DTR is dropped if the hangup on close termio flag is on. | |
978 | */ | |
979 | static void shutdown(struct esp_struct * info) | |
980 | { | |
981 | unsigned long flags, f; | |
982 | ||
983 | if (!(info->flags & ASYNC_INITIALIZED)) | |
984 | return; | |
985 | ||
986 | #ifdef SERIAL_DEBUG_OPEN | |
987 | printk("Shutting down serial port %d (irq %d)....", info->line, | |
988 | info->irq); | |
989 | #endif | |
990 | ||
991 | spin_lock_irqsave(&info->lock, flags); | |
992 | /* | |
993 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
994 | * here so the queue might never be waken up | |
995 | */ | |
996 | wake_up_interruptible(&info->delta_msr_wait); | |
997 | wake_up_interruptible(&info->break_wait); | |
998 | ||
999 | /* stop a DMA transfer on the port being closed */ | |
1000 | /* DMA lock is higher priority always */ | |
1001 | if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) { | |
1002 | f=claim_dma_lock(); | |
1003 | disable_dma(dma); | |
1004 | clear_dma_ff(dma); | |
1005 | release_dma_lock(f); | |
1006 | ||
1007 | dma_bytes = 0; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Free the IRQ | |
1012 | */ | |
1013 | free_irq(info->irq, info); | |
1014 | ||
1015 | if (dma_buffer) { | |
1016 | struct esp_struct *current_port = ports; | |
1017 | ||
1018 | while (current_port) { | |
1019 | if ((current_port != info) && | |
1020 | (current_port->flags & ASYNC_INITIALIZED)) | |
1021 | break; | |
1022 | ||
1023 | current_port = current_port->next_port; | |
1024 | } | |
1025 | ||
1026 | if (!current_port) { | |
1027 | free_dma(dma); | |
1028 | free_pages((unsigned long)dma_buffer, | |
1029 | get_order(DMA_BUFFER_SZ)); | |
1030 | dma_buffer = NULL; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | if (info->xmit_buf) { | |
1035 | free_page((unsigned long) info->xmit_buf); | |
1036 | info->xmit_buf = NULL; | |
1037 | } | |
1038 | ||
1039 | info->IER = 0; | |
1040 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1041 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1042 | ||
1043 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
1044 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); | |
1045 | ||
1046 | info->MCR &= ~UART_MCR_OUT2; | |
1047 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1048 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1049 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1050 | ||
1051 | if (info->tty) | |
1052 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
1053 | ||
1054 | info->flags &= ~ASYNC_INITIALIZED; | |
1055 | spin_unlock_irqrestore(&info->lock, flags); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * This routine is called to set the UART divisor registers to match | |
1060 | * the specified baud rate for a serial port. | |
1061 | */ | |
1062 | static void change_speed(struct esp_struct *info) | |
1063 | { | |
1064 | unsigned short port; | |
1065 | int quot = 0; | |
1066 | unsigned cflag,cval; | |
1067 | int baud, bits; | |
1068 | unsigned char flow1 = 0, flow2 = 0; | |
1069 | unsigned long flags; | |
1070 | ||
1071 | if (!info->tty || !info->tty->termios) | |
1072 | return; | |
1073 | cflag = info->tty->termios->c_cflag; | |
1074 | port = info->port; | |
1075 | ||
1076 | /* byte size and parity */ | |
1077 | switch (cflag & CSIZE) { | |
1078 | case CS5: cval = 0x00; bits = 7; break; | |
1079 | case CS6: cval = 0x01; bits = 8; break; | |
1080 | case CS7: cval = 0x02; bits = 9; break; | |
1081 | case CS8: cval = 0x03; bits = 10; break; | |
1082 | default: cval = 0x00; bits = 7; break; | |
1083 | } | |
1084 | if (cflag & CSTOPB) { | |
1085 | cval |= 0x04; | |
1086 | bits++; | |
1087 | } | |
1088 | if (cflag & PARENB) { | |
1089 | cval |= UART_LCR_PARITY; | |
1090 | bits++; | |
1091 | } | |
1092 | if (!(cflag & PARODD)) | |
1093 | cval |= UART_LCR_EPAR; | |
1094 | #ifdef CMSPAR | |
1095 | if (cflag & CMSPAR) | |
1096 | cval |= UART_LCR_SPAR; | |
1097 | #endif | |
1098 | ||
1099 | baud = tty_get_baud_rate(info->tty); | |
1100 | if (baud == 38400 && | |
1101 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | |
1102 | quot = info->custom_divisor; | |
1103 | else { | |
1104 | if (baud == 134) | |
1105 | /* Special case since 134 is really 134.5 */ | |
1106 | quot = (2*BASE_BAUD / 269); | |
1107 | else if (baud) | |
1108 | quot = BASE_BAUD / baud; | |
1109 | } | |
1110 | /* If the quotient is ever zero, default to 9600 bps */ | |
1111 | if (!quot) | |
1112 | quot = BASE_BAUD / 9600; | |
1113 | ||
1114 | info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50); | |
1115 | ||
1116 | /* CTS flow control flag and modem status interrupts */ | |
1117 | /* info->IER &= ~UART_IER_MSI; */ | |
1118 | if (cflag & CRTSCTS) { | |
1119 | info->flags |= ASYNC_CTS_FLOW; | |
1120 | /* info->IER |= UART_IER_MSI; */ | |
1121 | flow1 = 0x04; | |
1122 | flow2 = 0x10; | |
1123 | } else | |
1124 | info->flags &= ~ASYNC_CTS_FLOW; | |
1125 | if (cflag & CLOCAL) | |
1126 | info->flags &= ~ASYNC_CHECK_CD; | |
1127 | else { | |
1128 | info->flags |= ASYNC_CHECK_CD; | |
1129 | /* info->IER |= UART_IER_MSI; */ | |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Set up parity check flag | |
1134 | */ | |
1135 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1136 | ||
1137 | info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
1138 | if (I_INPCK(info->tty)) | |
1139 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
1140 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) | |
1141 | info->read_status_mask |= UART_LSR_BI; | |
1142 | ||
1143 | info->ignore_status_mask = 0; | |
1144 | #if 0 | |
1145 | /* This should be safe, but for some broken bits of hardware... */ | |
1146 | if (I_IGNPAR(info->tty)) { | |
1147 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
1148 | info->read_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
1149 | } | |
1150 | #endif | |
1151 | if (I_IGNBRK(info->tty)) { | |
1152 | info->ignore_status_mask |= UART_LSR_BI; | |
1153 | info->read_status_mask |= UART_LSR_BI; | |
1154 | /* | |
1155 | * If we're ignore parity and break indicators, ignore | |
1156 | * overruns too. (For real raw support). | |
1157 | */ | |
1158 | if (I_IGNPAR(info->tty)) { | |
1159 | info->ignore_status_mask |= UART_LSR_OE | \ | |
1160 | UART_LSR_PE | UART_LSR_FE; | |
1161 | info->read_status_mask |= UART_LSR_OE | \ | |
1162 | UART_LSR_PE | UART_LSR_FE; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | if (I_IXOFF(info->tty)) | |
1167 | flow1 |= 0x81; | |
1168 | ||
1169 | spin_lock_irqsave(&info->lock, flags); | |
1170 | /* set baud */ | |
1171 | serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD); | |
1172 | serial_out(info, UART_ESI_CMD2, quot >> 8); | |
1173 | serial_out(info, UART_ESI_CMD2, quot & 0xff); | |
1174 | ||
1175 | /* set data bits, parity, etc. */ | |
1176 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1177 | serial_out(info, UART_ESI_CMD2, UART_LCR); | |
1178 | serial_out(info, UART_ESI_CMD2, cval); | |
1179 | ||
1180 | /* Enable flow control */ | |
1181 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL); | |
1182 | serial_out(info, UART_ESI_CMD2, flow1); | |
1183 | serial_out(info, UART_ESI_CMD2, flow2); | |
1184 | ||
1185 | /* set flow control characters (XON/XOFF only) */ | |
1186 | if (I_IXOFF(info->tty)) { | |
1187 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS); | |
1188 | serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty)); | |
1189 | serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty)); | |
1190 | serial_out(info, UART_ESI_CMD2, 0x10); | |
1191 | serial_out(info, UART_ESI_CMD2, 0x21); | |
1192 | switch (cflag & CSIZE) { | |
1193 | case CS5: | |
1194 | serial_out(info, UART_ESI_CMD2, 0x1f); | |
1195 | break; | |
1196 | case CS6: | |
1197 | serial_out(info, UART_ESI_CMD2, 0x3f); | |
1198 | break; | |
1199 | case CS7: | |
1200 | case CS8: | |
1201 | serial_out(info, UART_ESI_CMD2, 0x7f); | |
1202 | break; | |
1203 | default: | |
1204 | serial_out(info, UART_ESI_CMD2, 0xff); | |
1205 | break; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | /* Set high/low water */ | |
1210 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); | |
1211 | serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8); | |
1212 | serial_out(info, UART_ESI_CMD2, info->config.flow_off); | |
1213 | serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8); | |
1214 | serial_out(info, UART_ESI_CMD2, info->config.flow_on); | |
1215 | ||
1216 | spin_unlock_irqrestore(&info->lock, flags); | |
1217 | } | |
1218 | ||
1219 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) | |
1220 | { | |
1221 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1222 | unsigned long flags; | |
1223 | ||
1224 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) | |
1225 | return; | |
1226 | ||
1227 | if (!tty || !info->xmit_buf) | |
1228 | return; | |
1229 | ||
1230 | spin_lock_irqsave(&info->lock, flags); | |
1231 | if (info->xmit_cnt < ESP_XMIT_SIZE - 1) { | |
1232 | info->xmit_buf[info->xmit_head++] = ch; | |
1233 | info->xmit_head &= ESP_XMIT_SIZE-1; | |
1234 | info->xmit_cnt++; | |
1235 | } | |
1236 | spin_unlock_irqrestore(&info->lock, flags); | |
1237 | } | |
1238 | ||
1239 | static void rs_flush_chars(struct tty_struct *tty) | |
1240 | { | |
1241 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1242 | unsigned long flags; | |
1243 | ||
1244 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
1245 | return; | |
1246 | ||
1247 | spin_lock_irqsave(&info->lock, flags); | |
1248 | ||
1249 | if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf) | |
1250 | goto out; | |
1251 | ||
1252 | if (!(info->IER & UART_IER_THRI)) { | |
1253 | info->IER |= UART_IER_THRI; | |
1254 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1255 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1256 | } | |
1257 | out: | |
1258 | spin_unlock_irqrestore(&info->lock, flags); | |
1259 | } | |
1260 | ||
1261 | static int rs_write(struct tty_struct * tty, | |
1262 | const unsigned char *buf, int count) | |
1263 | { | |
1264 | int c, t, ret = 0; | |
1265 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1266 | unsigned long flags; | |
1267 | ||
1268 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
1269 | return 0; | |
1270 | ||
1271 | if (!tty || !info->xmit_buf || !tmp_buf) | |
1272 | return 0; | |
1273 | ||
1274 | while (1) { | |
1275 | /* Thanks to R. Wolff for suggesting how to do this with */ | |
1276 | /* interrupts enabled */ | |
1277 | ||
1278 | c = count; | |
1279 | t = ESP_XMIT_SIZE - info->xmit_cnt - 1; | |
1280 | ||
1281 | if (t < c) | |
1282 | c = t; | |
1283 | ||
1284 | t = ESP_XMIT_SIZE - info->xmit_head; | |
1285 | ||
1286 | if (t < c) | |
1287 | c = t; | |
1288 | ||
1289 | if (c <= 0) | |
1290 | break; | |
1291 | ||
1292 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
1293 | ||
1294 | info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1); | |
1295 | info->xmit_cnt += c; | |
1296 | buf += c; | |
1297 | count -= c; | |
1298 | ret += c; | |
1299 | } | |
1300 | ||
1301 | spin_lock_irqsave(&info->lock, flags); | |
1302 | ||
1303 | if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) { | |
1304 | info->IER |= UART_IER_THRI; | |
1305 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1306 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1307 | } | |
1308 | ||
1309 | spin_unlock_irqrestore(&info->lock, flags); | |
1310 | return ret; | |
1311 | } | |
1312 | ||
1313 | static int rs_write_room(struct tty_struct *tty) | |
1314 | { | |
1315 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1316 | int ret; | |
1317 | unsigned long flags; | |
1318 | ||
1319 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
1320 | return 0; | |
1321 | ||
1322 | spin_lock_irqsave(&info->lock, flags); | |
1323 | ||
1324 | ret = ESP_XMIT_SIZE - info->xmit_cnt - 1; | |
1325 | if (ret < 0) | |
1326 | ret = 0; | |
1327 | spin_unlock_irqrestore(&info->lock, flags); | |
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
1332 | { | |
1333 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1334 | ||
1335 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
1336 | return 0; | |
1337 | return info->xmit_cnt; | |
1338 | } | |
1339 | ||
1340 | static void rs_flush_buffer(struct tty_struct *tty) | |
1341 | { | |
1342 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1343 | unsigned long flags; | |
1344 | ||
1345 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
1346 | return; | |
1347 | spin_lock_irqsave(&info->lock, flags); | |
1348 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
1349 | spin_unlock_irqrestore(&info->lock, flags); | |
1350 | tty_wakeup(tty); | |
1351 | } | |
1352 | ||
1353 | /* | |
1354 | * ------------------------------------------------------------ | |
1355 | * rs_throttle() | |
1356 | * | |
1357 | * This routine is called by the upper-layer tty layer to signal that | |
1358 | * incoming characters should be throttled. | |
1359 | * ------------------------------------------------------------ | |
1360 | */ | |
1361 | static void rs_throttle(struct tty_struct * tty) | |
1362 | { | |
1363 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1364 | unsigned long flags; | |
1365 | #ifdef SERIAL_DEBUG_THROTTLE | |
1366 | char buf[64]; | |
1367 | ||
1368 | printk("throttle %s: %d....\n", tty_name(tty, buf), | |
1369 | tty->ldisc.chars_in_buffer(tty)); | |
1370 | #endif | |
1371 | ||
1372 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
1373 | return; | |
1374 | ||
1375 | spin_lock_irqsave(&info->lock, flags); | |
1376 | info->IER &= ~UART_IER_RDI; | |
1377 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1378 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1379 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
1380 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1381 | spin_unlock_irqrestore(&info->lock, flags); | |
1382 | } | |
1383 | ||
1384 | static void rs_unthrottle(struct tty_struct * tty) | |
1385 | { | |
1386 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1387 | unsigned long flags; | |
1388 | #ifdef SERIAL_DEBUG_THROTTLE | |
1389 | char buf[64]; | |
1390 | ||
1391 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), | |
1392 | tty->ldisc.chars_in_buffer(tty)); | |
1393 | #endif | |
1394 | ||
1395 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
1396 | return; | |
1397 | ||
1398 | spin_lock_irqsave(&info->lock, flags); | |
1399 | info->IER |= UART_IER_RDI; | |
1400 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1401 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1402 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
1403 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); | |
1404 | spin_unlock_irqrestore(&info->lock, flags); | |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * ------------------------------------------------------------ | |
1409 | * rs_ioctl() and friends | |
1410 | * ------------------------------------------------------------ | |
1411 | */ | |
1412 | ||
1413 | static int get_serial_info(struct esp_struct * info, | |
1414 | struct serial_struct __user *retinfo) | |
1415 | { | |
1416 | struct serial_struct tmp; | |
1417 | ||
1418 | memset(&tmp, 0, sizeof(tmp)); | |
1419 | tmp.type = PORT_16550A; | |
1420 | tmp.line = info->line; | |
1421 | tmp.port = info->port; | |
1422 | tmp.irq = info->irq; | |
1423 | tmp.flags = info->flags; | |
1424 | tmp.xmit_fifo_size = 1024; | |
1425 | tmp.baud_base = BASE_BAUD; | |
1426 | tmp.close_delay = info->close_delay; | |
1427 | tmp.closing_wait = info->closing_wait; | |
1428 | tmp.custom_divisor = info->custom_divisor; | |
1429 | tmp.hub6 = 0; | |
1430 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) | |
1431 | return -EFAULT; | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static int get_esp_config(struct esp_struct * info, | |
1436 | struct hayes_esp_config __user *retinfo) | |
1437 | { | |
1438 | struct hayes_esp_config tmp; | |
1439 | ||
1440 | if (!retinfo) | |
1441 | return -EFAULT; | |
1442 | ||
1443 | memset(&tmp, 0, sizeof(tmp)); | |
1444 | tmp.rx_timeout = info->config.rx_timeout; | |
1445 | tmp.rx_trigger = info->config.rx_trigger; | |
1446 | tmp.tx_trigger = info->config.tx_trigger; | |
1447 | tmp.flow_off = info->config.flow_off; | |
1448 | tmp.flow_on = info->config.flow_on; | |
1449 | tmp.pio_threshold = info->config.pio_threshold; | |
1450 | tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma); | |
1451 | ||
1452 | return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; | |
1453 | } | |
1454 | ||
1455 | static int set_serial_info(struct esp_struct * info, | |
1456 | struct serial_struct __user *new_info) | |
1457 | { | |
1458 | struct serial_struct new_serial; | |
1459 | struct esp_struct old_info; | |
1460 | unsigned int change_irq; | |
1461 | int retval = 0; | |
1462 | struct esp_struct *current_async; | |
1463 | ||
1464 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
1465 | return -EFAULT; | |
1466 | old_info = *info; | |
1467 | ||
1468 | if ((new_serial.type != PORT_16550A) || | |
1469 | (new_serial.hub6) || | |
1470 | (info->port != new_serial.port) || | |
1471 | (new_serial.baud_base != BASE_BAUD) || | |
1472 | (new_serial.irq > 15) || | |
1473 | (new_serial.irq < 2) || | |
1474 | (new_serial.irq == 6) || | |
1475 | (new_serial.irq == 8) || | |
1476 | (new_serial.irq == 13)) | |
1477 | return -EINVAL; | |
1478 | ||
1479 | change_irq = new_serial.irq != info->irq; | |
1480 | ||
1481 | if (change_irq && (info->line % 8)) | |
1482 | return -EINVAL; | |
1483 | ||
1484 | if (!capable(CAP_SYS_ADMIN)) { | |
1485 | if (change_irq || | |
1486 | (new_serial.close_delay != info->close_delay) || | |
1487 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
1488 | (info->flags & ~ASYNC_USR_MASK))) | |
1489 | return -EPERM; | |
1490 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
1491 | (new_serial.flags & ASYNC_USR_MASK)); | |
1492 | info->custom_divisor = new_serial.custom_divisor; | |
1493 | } else { | |
1494 | if (new_serial.irq == 2) | |
1495 | new_serial.irq = 9; | |
1496 | ||
1497 | if (change_irq) { | |
1498 | current_async = ports; | |
1499 | ||
1500 | while (current_async) { | |
1501 | if ((current_async->line >= info->line) && | |
1502 | (current_async->line < (info->line + 8))) { | |
1503 | if (current_async == info) { | |
1504 | if (current_async->count > 1) | |
1505 | return -EBUSY; | |
1506 | } else if (current_async->count) | |
1507 | return -EBUSY; | |
1508 | } | |
1509 | ||
1510 | current_async = current_async->next_port; | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * OK, past this point, all the error checking has been done. | |
1516 | * At this point, we start making changes..... | |
1517 | */ | |
1518 | ||
1519 | info->flags = ((info->flags & ~ASYNC_FLAGS) | | |
1520 | (new_serial.flags & ASYNC_FLAGS)); | |
1521 | info->custom_divisor = new_serial.custom_divisor; | |
1522 | info->close_delay = new_serial.close_delay * HZ/100; | |
1523 | info->closing_wait = new_serial.closing_wait * HZ/100; | |
1524 | ||
1525 | if (change_irq) { | |
1526 | /* | |
1527 | * We need to shutdown the serial port at the old | |
1528 | * port/irq combination. | |
1529 | */ | |
1530 | shutdown(info); | |
1531 | ||
1532 | current_async = ports; | |
1533 | ||
1534 | while (current_async) { | |
1535 | if ((current_async->line >= info->line) && | |
1536 | (current_async->line < (info->line + 8))) | |
1537 | current_async->irq = new_serial.irq; | |
1538 | ||
1539 | current_async = current_async->next_port; | |
1540 | } | |
1541 | ||
1542 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); | |
1543 | if (info->irq == 9) | |
1544 | serial_out(info, UART_ESI_CMD2, 0x02); | |
1545 | else | |
1546 | serial_out(info, UART_ESI_CMD2, info->irq); | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | if (info->flags & ASYNC_INITIALIZED) { | |
1551 | if (((old_info.flags & ASYNC_SPD_MASK) != | |
1552 | (info->flags & ASYNC_SPD_MASK)) || | |
1553 | (old_info.custom_divisor != info->custom_divisor)) { | |
1554 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
1555 | info->tty->alt_speed = 57600; | |
1556 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
1557 | info->tty->alt_speed = 115200; | |
1558 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
1559 | info->tty->alt_speed = 230400; | |
1560 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
1561 | info->tty->alt_speed = 460800; | |
1562 | change_speed(info); | |
1563 | } | |
1564 | } else | |
1565 | retval = startup(info); | |
1566 | ||
1567 | return retval; | |
1568 | } | |
1569 | ||
1570 | static int set_esp_config(struct esp_struct * info, | |
1571 | struct hayes_esp_config __user * new_info) | |
1572 | { | |
1573 | struct hayes_esp_config new_config; | |
1574 | unsigned int change_dma; | |
1575 | int retval = 0; | |
1576 | struct esp_struct *current_async; | |
1577 | unsigned long flags; | |
1578 | ||
1579 | /* Perhaps a non-sysadmin user should be able to do some of these */ | |
1580 | /* operations. I haven't decided yet. */ | |
1581 | ||
1582 | if (!capable(CAP_SYS_ADMIN)) | |
1583 | return -EPERM; | |
1584 | ||
1585 | if (copy_from_user(&new_config, new_info, sizeof(new_config))) | |
1586 | return -EFAULT; | |
1587 | ||
1588 | if ((new_config.flow_on >= new_config.flow_off) || | |
1589 | (new_config.rx_trigger < 1) || | |
1590 | (new_config.tx_trigger < 1) || | |
1591 | (new_config.flow_off < 1) || | |
1592 | (new_config.flow_on < 1) || | |
1593 | (new_config.rx_trigger > 1023) || | |
1594 | (new_config.tx_trigger > 1023) || | |
1595 | (new_config.flow_off > 1023) || | |
1596 | (new_config.flow_on > 1023) || | |
1597 | (new_config.pio_threshold < 0) || | |
1598 | (new_config.pio_threshold > 1024)) | |
1599 | return -EINVAL; | |
1600 | ||
1601 | if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3)) | |
1602 | new_config.dma_channel = 0; | |
1603 | ||
1604 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
1605 | change_dma = new_config.dma_channel; | |
1606 | else | |
1607 | change_dma = (new_config.dma_channel != dma); | |
1608 | ||
1609 | if (change_dma) { | |
1610 | if (new_config.dma_channel) { | |
1611 | /* PIO mode to DMA mode transition OR */ | |
1612 | /* change current DMA channel */ | |
1613 | ||
1614 | current_async = ports; | |
1615 | ||
1616 | while (current_async) { | |
1617 | if (current_async == info) { | |
1618 | if (current_async->count > 1) | |
1619 | return -EBUSY; | |
1620 | } else if (current_async->count) | |
1621 | return -EBUSY; | |
1622 | ||
1623 | current_async = | |
1624 | current_async->next_port; | |
1625 | } | |
1626 | ||
1627 | shutdown(info); | |
1628 | dma = new_config.dma_channel; | |
1629 | info->stat_flags &= ~ESP_STAT_NEVER_DMA; | |
1630 | ||
1631 | /* all ports must use the same DMA channel */ | |
1632 | ||
1633 | spin_lock_irqsave(&info->lock, flags); | |
1634 | current_async = ports; | |
1635 | ||
1636 | while (current_async) { | |
1637 | esp_basic_init(current_async); | |
1638 | current_async = current_async->next_port; | |
1639 | } | |
1640 | spin_unlock_irqrestore(&info->lock, flags); | |
1641 | } else { | |
1642 | /* DMA mode to PIO mode only */ | |
1643 | ||
1644 | if (info->count > 1) | |
1645 | return -EBUSY; | |
1646 | ||
1647 | shutdown(info); | |
1648 | spin_lock_irqsave(&info->lock, flags); | |
1649 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
1650 | esp_basic_init(info); | |
1651 | spin_unlock_irqrestore(&info->lock, flags); | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | info->config.pio_threshold = new_config.pio_threshold; | |
1656 | ||
1657 | if ((new_config.flow_off != info->config.flow_off) || | |
1658 | (new_config.flow_on != info->config.flow_on)) { | |
1659 | unsigned long flags; | |
1660 | ||
1661 | info->config.flow_off = new_config.flow_off; | |
1662 | info->config.flow_on = new_config.flow_on; | |
1663 | ||
1664 | spin_lock_irqsave(&info->lock, flags); | |
1665 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); | |
1666 | serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8); | |
1667 | serial_out(info, UART_ESI_CMD2, new_config.flow_off); | |
1668 | serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8); | |
1669 | serial_out(info, UART_ESI_CMD2, new_config.flow_on); | |
1670 | spin_unlock_irqrestore(&info->lock, flags); | |
1671 | } | |
1672 | ||
1673 | if ((new_config.rx_trigger != info->config.rx_trigger) || | |
1674 | (new_config.tx_trigger != info->config.tx_trigger)) { | |
1675 | unsigned long flags; | |
1676 | ||
1677 | info->config.rx_trigger = new_config.rx_trigger; | |
1678 | info->config.tx_trigger = new_config.tx_trigger; | |
1679 | spin_lock_irqsave(&info->lock, flags); | |
1680 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); | |
1681 | serial_out(info, UART_ESI_CMD2, | |
1682 | new_config.rx_trigger >> 8); | |
1683 | serial_out(info, UART_ESI_CMD2, new_config.rx_trigger); | |
1684 | serial_out(info, UART_ESI_CMD2, | |
1685 | new_config.tx_trigger >> 8); | |
1686 | serial_out(info, UART_ESI_CMD2, new_config.tx_trigger); | |
1687 | spin_unlock_irqrestore(&info->lock, flags); | |
1688 | } | |
1689 | ||
1690 | if (new_config.rx_timeout != info->config.rx_timeout) { | |
1691 | unsigned long flags; | |
1692 | ||
1693 | info->config.rx_timeout = new_config.rx_timeout; | |
1694 | spin_lock_irqsave(&info->lock, flags); | |
1695 | ||
1696 | if (info->IER & UART_IER_RDI) { | |
1697 | serial_out(info, UART_ESI_CMD1, | |
1698 | ESI_SET_RX_TIMEOUT); | |
1699 | serial_out(info, UART_ESI_CMD2, | |
1700 | new_config.rx_timeout); | |
1701 | } | |
1702 | ||
1703 | spin_unlock_irqrestore(&info->lock, flags); | |
1704 | } | |
1705 | ||
1706 | if (!(info->flags & ASYNC_INITIALIZED)) | |
1707 | retval = startup(info); | |
1708 | ||
1709 | return retval; | |
1710 | } | |
1711 | ||
1712 | /* | |
1713 | * get_lsr_info - get line status register info | |
1714 | * | |
1715 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1716 | * is emptied. On bus types like RS485, the transmitter must | |
1717 | * release the bus after transmitting. This must be done when | |
1718 | * the transmit shift register is empty, not be done when the | |
1719 | * transmit holding register is empty. This functionality | |
1720 | * allows an RS485 driver to be written in user space. | |
1721 | */ | |
1722 | static int get_lsr_info(struct esp_struct * info, unsigned int __user *value) | |
1723 | { | |
1724 | unsigned char status; | |
1725 | unsigned int result; | |
1726 | unsigned long flags; | |
1727 | ||
1728 | spin_lock_irqsave(&info->lock, flags); | |
1729 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
1730 | status = serial_in(info, UART_ESI_STAT1); | |
1731 | spin_unlock_irqrestore(&info->lock, flags); | |
1732 | result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); | |
1733 | return put_user(result,value); | |
1734 | } | |
1735 | ||
1736 | ||
1737 | static int esp_tiocmget(struct tty_struct *tty, struct file *file) | |
1738 | { | |
1739 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1740 | unsigned char control, status; | |
1741 | unsigned long flags; | |
1742 | ||
1743 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1744 | return -ENODEV; | |
1745 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1746 | return -EIO; | |
1747 | ||
1748 | control = info->MCR; | |
1749 | ||
1750 | spin_lock_irqsave(&info->lock, flags); | |
1751 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
1752 | status = serial_in(info, UART_ESI_STAT2); | |
1753 | spin_unlock_irqrestore(&info->lock, flags); | |
1754 | ||
1755 | return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) | |
1756 | | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) | |
1757 | | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) | |
1758 | | ((status & UART_MSR_RI) ? TIOCM_RNG : 0) | |
1759 | | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) | |
1760 | | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0); | |
1761 | } | |
1762 | ||
1763 | static int esp_tiocmset(struct tty_struct *tty, struct file *file, | |
1764 | unsigned int set, unsigned int clear) | |
1765 | { | |
1766 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1767 | unsigned long flags; | |
1768 | ||
1769 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1770 | return -ENODEV; | |
1771 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1772 | return -EIO; | |
1773 | ||
1774 | spin_lock_irqsave(&info->lock, flags); | |
1775 | ||
1776 | if (set & TIOCM_RTS) | |
1777 | info->MCR |= UART_MCR_RTS; | |
1778 | if (set & TIOCM_DTR) | |
1779 | info->MCR |= UART_MCR_DTR; | |
1780 | ||
1781 | if (clear & TIOCM_RTS) | |
1782 | info->MCR &= ~UART_MCR_RTS; | |
1783 | if (clear & TIOCM_DTR) | |
1784 | info->MCR &= ~UART_MCR_DTR; | |
1785 | ||
1786 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1787 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1788 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1789 | ||
1790 | spin_unlock_irqrestore(&info->lock, flags); | |
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * rs_break() --- routine which turns the break handling on or off | |
1796 | */ | |
1797 | static void esp_break(struct tty_struct *tty, int break_state) | |
1798 | { | |
1799 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1800 | unsigned long flags; | |
1801 | ||
1802 | if (serial_paranoia_check(info, tty->name, "esp_break")) | |
1803 | return; | |
1804 | ||
1805 | if (break_state == -1) { | |
1806 | spin_lock_irqsave(&info->lock, flags); | |
1807 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); | |
1808 | serial_out(info, UART_ESI_CMD2, 0x01); | |
1809 | spin_unlock_irqrestore(&info->lock, flags); | |
1810 | ||
1811 | /* FIXME - new style wait needed here */ | |
1812 | interruptible_sleep_on(&info->break_wait); | |
1813 | } else { | |
1814 | spin_lock_irqsave(&info->lock, flags); | |
1815 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); | |
1816 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1817 | spin_unlock_irqrestore(&info->lock, flags); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1822 | unsigned int cmd, unsigned long arg) | |
1823 | { | |
1824 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1825 | struct async_icount cprev, cnow; /* kernel counter temps */ | |
1826 | struct serial_icounter_struct __user *p_cuser; /* user space */ | |
1827 | void __user *argp = (void __user *)arg; | |
1828 | unsigned long flags; | |
1829 | ||
1830 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1831 | return -ENODEV; | |
1832 | ||
1833 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1834 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1835 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) && | |
1836 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) && | |
1837 | (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) { | |
1838 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1839 | return -EIO; | |
1840 | } | |
1841 | ||
1842 | switch (cmd) { | |
1843 | case TIOCGSERIAL: | |
1844 | return get_serial_info(info, argp); | |
1845 | case TIOCSSERIAL: | |
1846 | return set_serial_info(info, argp); | |
1847 | case TIOCSERCONFIG: | |
1848 | /* do not reconfigure after initial configuration */ | |
1849 | return 0; | |
1850 | ||
1851 | case TIOCSERGWILD: | |
1852 | return put_user(0L, (unsigned long __user *)argp); | |
1853 | ||
1854 | case TIOCSERGETLSR: /* Get line status register */ | |
1855 | return get_lsr_info(info, argp); | |
1856 | ||
1857 | case TIOCSERSWILD: | |
1858 | if (!capable(CAP_SYS_ADMIN)) | |
1859 | return -EPERM; | |
1860 | return 0; | |
1861 | ||
1862 | /* | |
1863 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1864 | * - mask passed in arg for lines of interest | |
1865 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1866 | * Caller should use TIOCGICOUNT to see which one it was | |
1867 | */ | |
1868 | case TIOCMIWAIT: | |
1869 | spin_lock_irqsave(&info->lock, flags); | |
1870 | cprev = info->icount; /* note the counters on entry */ | |
1871 | spin_unlock_irqrestore(&info->lock, flags); | |
1872 | while (1) { | |
1873 | /* FIXME: convert to new style wakeup */ | |
1874 | interruptible_sleep_on(&info->delta_msr_wait); | |
1875 | /* see if a signal did it */ | |
1876 | if (signal_pending(current)) | |
1877 | return -ERESTARTSYS; | |
1878 | spin_lock_irqsave(&info->lock, flags); | |
1879 | cnow = info->icount; /* atomic copy */ | |
1880 | spin_unlock_irqrestore(&info->lock, flags); | |
1881 | if (cnow.rng == cprev.rng && | |
1882 | cnow.dsr == cprev.dsr && | |
1883 | cnow.dcd == cprev.dcd && | |
1884 | cnow.cts == cprev.cts) | |
1885 | return -EIO; /* no change => error */ | |
1886 | if (((arg & TIOCM_RNG) && | |
1887 | (cnow.rng != cprev.rng)) || | |
1888 | ((arg & TIOCM_DSR) && | |
1889 | (cnow.dsr != cprev.dsr)) || | |
1890 | ((arg & TIOCM_CD) && | |
1891 | (cnow.dcd != cprev.dcd)) || | |
1892 | ((arg & TIOCM_CTS) && | |
1893 | (cnow.cts != cprev.cts)) ) { | |
1894 | return 0; | |
1895 | } | |
1896 | cprev = cnow; | |
1897 | } | |
1898 | /* NOTREACHED */ | |
1899 | ||
1900 | /* | |
1901 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1902 | * Return: write counters to the user passed counter struct | |
1903 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1904 | * RI where only 0->1 is counted. | |
1905 | */ | |
1906 | case TIOCGICOUNT: | |
1907 | spin_lock_irqsave(&info->lock, flags); | |
1908 | cnow = info->icount; | |
1909 | spin_unlock_irqrestore(&info->lock, flags); | |
1910 | p_cuser = argp; | |
1911 | if (put_user(cnow.cts, &p_cuser->cts) || | |
1912 | put_user(cnow.dsr, &p_cuser->dsr) || | |
1913 | put_user(cnow.rng, &p_cuser->rng) || | |
1914 | put_user(cnow.dcd, &p_cuser->dcd)) | |
1915 | return -EFAULT; | |
1916 | ||
1917 | return 0; | |
1918 | case TIOCGHAYESESP: | |
1919 | return get_esp_config(info, argp); | |
1920 | case TIOCSHAYESESP: | |
1921 | return set_esp_config(info, argp); | |
1922 | ||
1923 | default: | |
1924 | return -ENOIOCTLCMD; | |
1925 | } | |
1926 | return 0; | |
1927 | } | |
1928 | ||
1929 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1930 | { | |
1931 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1932 | unsigned long flags; | |
1933 | ||
1934 | if ( (tty->termios->c_cflag == old_termios->c_cflag) | |
1935 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) | |
1936 | == RELEVANT_IFLAG(old_termios->c_iflag))) | |
1937 | return; | |
1938 | ||
1939 | change_speed(info); | |
1940 | ||
1941 | spin_lock_irqsave(&info->lock, flags); | |
1942 | ||
1943 | /* Handle transition to B0 status */ | |
1944 | if ((old_termios->c_cflag & CBAUD) && | |
1945 | !(tty->termios->c_cflag & CBAUD)) { | |
1946 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); | |
1947 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1948 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1949 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1950 | } | |
1951 | ||
1952 | /* Handle transition away from B0 status */ | |
1953 | if (!(old_termios->c_cflag & CBAUD) && | |
1954 | (tty->termios->c_cflag & CBAUD)) { | |
1955 | info->MCR |= (UART_MCR_DTR | UART_MCR_RTS); | |
1956 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1957 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1958 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1959 | } | |
1960 | ||
1961 | spin_unlock_irqrestore(&info->lock, flags); | |
1962 | ||
1963 | /* Handle turning of CRTSCTS */ | |
1964 | if ((old_termios->c_cflag & CRTSCTS) && | |
1965 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1966 | rs_start(tty); | |
1967 | } | |
1968 | } | |
1969 | ||
1970 | /* | |
1971 | * ------------------------------------------------------------ | |
1972 | * rs_close() | |
1973 | * | |
1974 | * This routine is called when the serial port gets closed. First, we | |
1975 | * wait for the last remaining data to be sent. Then, we unlink its | |
1976 | * async structure from the interrupt chain if necessary, and we free | |
1977 | * that IRQ if nothing is left in the chain. | |
1978 | * ------------------------------------------------------------ | |
1979 | */ | |
1980 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1981 | { | |
1982 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1983 | unsigned long flags; | |
1984 | ||
1985 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1986 | return; | |
1987 | ||
1988 | spin_lock_irqsave(&info->lock, flags); | |
1989 | ||
1990 | if (tty_hung_up_p(filp)) { | |
1991 | DBG_CNT("before DEC-hung"); | |
1992 | goto out; | |
1993 | } | |
1994 | ||
1995 | #ifdef SERIAL_DEBUG_OPEN | |
1996 | printk("rs_close ttys%d, count = %d\n", info->line, info->count); | |
1997 | #endif | |
1998 | if ((tty->count == 1) && (info->count != 1)) { | |
1999 | /* | |
2000 | * Uh, oh. tty->count is 1, which means that the tty | |
2001 | * structure will be freed. Info->count should always | |
2002 | * be one in these conditions. If it's greater than | |
2003 | * one, we've got real problems, since it means the | |
2004 | * serial port won't be shutdown. | |
2005 | */ | |
2006 | printk("rs_close: bad serial port count; tty->count is 1, " | |
2007 | "info->count is %d\n", info->count); | |
2008 | info->count = 1; | |
2009 | } | |
2010 | if (--info->count < 0) { | |
2011 | printk("rs_close: bad serial port count for ttys%d: %d\n", | |
2012 | info->line, info->count); | |
2013 | info->count = 0; | |
2014 | } | |
2015 | if (info->count) { | |
2016 | DBG_CNT("before DEC-2"); | |
2017 | goto out; | |
2018 | } | |
2019 | info->flags |= ASYNC_CLOSING; | |
2020 | ||
2021 | spin_unlock_irqrestore(&info->lock, flags); | |
2022 | /* | |
2023 | * Now we wait for the transmit buffer to clear; and we notify | |
2024 | * the line discipline to only process XON/XOFF characters. | |
2025 | */ | |
2026 | tty->closing = 1; | |
2027 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
2028 | tty_wait_until_sent(tty, info->closing_wait); | |
2029 | /* | |
2030 | * At this point we stop accepting input. To do this, we | |
2031 | * disable the receive line status interrupts, and tell the | |
2032 | * interrupt driver to stop checking the data ready bit in the | |
2033 | * line status register. | |
2034 | */ | |
2035 | /* info->IER &= ~UART_IER_RLSI; */ | |
2036 | info->IER &= ~UART_IER_RDI; | |
2037 | info->read_status_mask &= ~UART_LSR_DR; | |
2038 | if (info->flags & ASYNC_INITIALIZED) { | |
2039 | ||
2040 | spin_lock_irqsave(&info->lock, flags); | |
2041 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
2042 | serial_out(info, UART_ESI_CMD2, info->IER); | |
2043 | ||
2044 | /* disable receive timeout */ | |
2045 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
2046 | serial_out(info, UART_ESI_CMD2, 0x00); | |
2047 | ||
2048 | spin_unlock_irqrestore(&info->lock, flags); | |
2049 | ||
2050 | /* | |
2051 | * Before we drop DTR, make sure the UART transmitter | |
2052 | * has completely drained; this is especially | |
2053 | * important if there is a transmit FIFO! | |
2054 | */ | |
2055 | rs_wait_until_sent(tty, info->timeout); | |
2056 | } | |
2057 | shutdown(info); | |
2058 | if (tty->driver->flush_buffer) | |
2059 | tty->driver->flush_buffer(tty); | |
2060 | tty_ldisc_flush(tty); | |
2061 | tty->closing = 0; | |
2062 | info->event = 0; | |
2063 | info->tty = NULL; | |
2064 | ||
2065 | if (info->blocked_open) { | |
2066 | if (info->close_delay) { | |
2067 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
2068 | } | |
2069 | wake_up_interruptible(&info->open_wait); | |
2070 | } | |
2071 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
2072 | wake_up_interruptible(&info->close_wait); | |
2073 | return; | |
2074 | ||
2075 | out: | |
2076 | spin_unlock_irqrestore(&info->lock, flags); | |
2077 | } | |
2078 | ||
2079 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
2080 | { | |
2081 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
2082 | unsigned long orig_jiffies, char_time; | |
2083 | unsigned long flags; | |
2084 | ||
2085 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
2086 | return; | |
2087 | ||
2088 | orig_jiffies = jiffies; | |
2089 | char_time = ((info->timeout - HZ / 50) / 1024) / 5; | |
2090 | ||
2091 | if (!char_time) | |
2092 | char_time = 1; | |
2093 | ||
2094 | spin_lock_irqsave(&info->lock, flags); | |
2095 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
2096 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
2097 | ||
2098 | while ((serial_in(info, UART_ESI_STAT1) != 0x03) || | |
2099 | (serial_in(info, UART_ESI_STAT2) != 0xff)) { | |
2100 | ||
2101 | spin_unlock_irqrestore(&info->lock, flags); | |
2102 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
2103 | ||
2104 | if (signal_pending(current)) | |
2105 | break; | |
2106 | ||
2107 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
2108 | break; | |
2109 | ||
2110 | spin_lock_irqsave(&info->lock, flags); | |
2111 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
2112 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
2113 | } | |
2114 | spin_unlock_irqrestore(&info->lock, flags); | |
2115 | set_current_state(TASK_RUNNING); | |
2116 | } | |
2117 | ||
2118 | /* | |
2119 | * esp_hangup() --- called by tty_hangup() when a hangup is signaled. | |
2120 | */ | |
2121 | static void esp_hangup(struct tty_struct *tty) | |
2122 | { | |
2123 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
2124 | ||
2125 | if (serial_paranoia_check(info, tty->name, "esp_hangup")) | |
2126 | return; | |
2127 | ||
2128 | rs_flush_buffer(tty); | |
2129 | shutdown(info); | |
2130 | info->event = 0; | |
2131 | info->count = 0; | |
2132 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
2133 | info->tty = NULL; | |
2134 | wake_up_interruptible(&info->open_wait); | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * ------------------------------------------------------------ | |
2139 | * esp_open() and friends | |
2140 | * ------------------------------------------------------------ | |
2141 | */ | |
2142 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
2143 | struct esp_struct *info) | |
2144 | { | |
2145 | DECLARE_WAITQUEUE(wait, current); | |
2146 | int retval; | |
2147 | int do_clocal = 0; | |
2148 | unsigned long flags; | |
2149 | ||
2150 | /* | |
2151 | * If the device is in the middle of being closed, then block | |
2152 | * until it's done, and then try again. | |
2153 | */ | |
2154 | if (tty_hung_up_p(filp) || | |
2155 | (info->flags & ASYNC_CLOSING)) { | |
2156 | if (info->flags & ASYNC_CLOSING) | |
2157 | interruptible_sleep_on(&info->close_wait); | |
2158 | #ifdef SERIAL_DO_RESTART | |
2159 | if (info->flags & ASYNC_HUP_NOTIFY) | |
2160 | return -EAGAIN; | |
2161 | else | |
2162 | return -ERESTARTSYS; | |
2163 | #else | |
2164 | return -EAGAIN; | |
2165 | #endif | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * If non-blocking mode is set, or the port is not enabled, | |
2170 | * then make the check up front and then exit. | |
2171 | */ | |
2172 | if ((filp->f_flags & O_NONBLOCK) || | |
2173 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
2174 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
2175 | return 0; | |
2176 | } | |
2177 | ||
2178 | if (tty->termios->c_cflag & CLOCAL) | |
2179 | do_clocal = 1; | |
2180 | ||
2181 | /* | |
2182 | * Block waiting for the carrier detect and the line to become | |
2183 | * free (i.e., not in use by the callout). While we are in | |
2184 | * this loop, info->count is dropped by one, so that | |
2185 | * rs_close() knows when to free things. We restore it upon | |
2186 | * exit, either normal or abnormal. | |
2187 | */ | |
2188 | retval = 0; | |
2189 | add_wait_queue(&info->open_wait, &wait); | |
2190 | #ifdef SERIAL_DEBUG_OPEN | |
2191 | printk("block_til_ready before block: ttys%d, count = %d\n", | |
2192 | info->line, info->count); | |
2193 | #endif | |
2194 | spin_lock_irqsave(&info->lock, flags); | |
2195 | if (!tty_hung_up_p(filp)) | |
2196 | info->count--; | |
2197 | info->blocked_open++; | |
2198 | while (1) { | |
2199 | if ((tty->termios->c_cflag & CBAUD)) { | |
2200 | unsigned int scratch; | |
2201 | ||
2202 | serial_out(info, UART_ESI_CMD1, ESI_READ_UART); | |
2203 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2204 | scratch = serial_in(info, UART_ESI_STAT1); | |
2205 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
2206 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2207 | serial_out(info, UART_ESI_CMD2, | |
2208 | scratch | UART_MCR_DTR | UART_MCR_RTS); | |
2209 | } | |
2210 | set_current_state(TASK_INTERRUPTIBLE); | |
2211 | if (tty_hung_up_p(filp) || | |
2212 | !(info->flags & ASYNC_INITIALIZED)) { | |
2213 | #ifdef SERIAL_DO_RESTART | |
2214 | if (info->flags & ASYNC_HUP_NOTIFY) | |
2215 | retval = -EAGAIN; | |
2216 | else | |
2217 | retval = -ERESTARTSYS; | |
2218 | #else | |
2219 | retval = -EAGAIN; | |
2220 | #endif | |
2221 | break; | |
2222 | } | |
2223 | ||
2224 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
2225 | if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD) | |
2226 | do_clocal = 1; | |
2227 | ||
2228 | if (!(info->flags & ASYNC_CLOSING) && | |
2229 | (do_clocal)) | |
2230 | break; | |
2231 | if (signal_pending(current)) { | |
2232 | retval = -ERESTARTSYS; | |
2233 | break; | |
2234 | } | |
2235 | #ifdef SERIAL_DEBUG_OPEN | |
2236 | printk("block_til_ready blocking: ttys%d, count = %d\n", | |
2237 | info->line, info->count); | |
2238 | #endif | |
2239 | spin_unlock_irqrestore(&info->lock, flags); | |
2240 | schedule(); | |
2241 | spin_lock_irqsave(&info->lock, flags); | |
2242 | } | |
2243 | set_current_state(TASK_RUNNING); | |
2244 | remove_wait_queue(&info->open_wait, &wait); | |
2245 | if (!tty_hung_up_p(filp)) | |
2246 | info->count++; | |
2247 | info->blocked_open--; | |
2248 | spin_unlock_irqrestore(&info->lock, flags); | |
2249 | #ifdef SERIAL_DEBUG_OPEN | |
2250 | printk("block_til_ready after blocking: ttys%d, count = %d\n", | |
2251 | info->line, info->count); | |
2252 | #endif | |
2253 | if (retval) | |
2254 | return retval; | |
2255 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
2256 | return 0; | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * This routine is called whenever a serial port is opened. It | |
2261 | * enables interrupts for a serial port, linking in its async structure into | |
2262 | * the IRQ chain. It also performs the serial-specific | |
2263 | * initialization for the tty structure. | |
2264 | */ | |
2265 | static int esp_open(struct tty_struct *tty, struct file * filp) | |
2266 | { | |
2267 | struct esp_struct *info; | |
2268 | int retval, line; | |
2269 | unsigned long flags; | |
2270 | ||
2271 | line = tty->index; | |
2272 | if ((line < 0) || (line >= NR_PORTS)) | |
2273 | return -ENODEV; | |
2274 | ||
2275 | /* find the port in the chain */ | |
2276 | ||
2277 | info = ports; | |
2278 | ||
2279 | while (info && (info->line != line)) | |
2280 | info = info->next_port; | |
2281 | ||
2282 | if (!info) { | |
2283 | serial_paranoia_check(info, tty->name, "esp_open"); | |
2284 | return -ENODEV; | |
2285 | } | |
2286 | ||
2287 | #ifdef SERIAL_DEBUG_OPEN | |
2288 | printk("esp_open %s, count = %d\n", tty->name, info->count); | |
2289 | #endif | |
2290 | spin_lock_irqsave(&info->lock, flags); | |
2291 | info->count++; | |
2292 | tty->driver_data = info; | |
2293 | info->tty = tty; | |
2294 | ||
2295 | if (!tmp_buf) { | |
2296 | tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL); | |
2297 | if (!tmp_buf) | |
2298 | return -ENOMEM; | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * Start up serial port | |
2303 | */ | |
2304 | retval = startup(info); | |
2305 | if (retval) | |
2306 | return retval; | |
2307 | ||
2308 | retval = block_til_ready(tty, filp, info); | |
2309 | if (retval) { | |
2310 | #ifdef SERIAL_DEBUG_OPEN | |
2311 | printk("esp_open returning after block_til_ready with %d\n", | |
2312 | retval); | |
2313 | #endif | |
2314 | return retval; | |
2315 | } | |
2316 | ||
2317 | #ifdef SERIAL_DEBUG_OPEN | |
2318 | printk("esp_open %s successful...", tty->name); | |
2319 | #endif | |
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | /* | |
2324 | * --------------------------------------------------------------------- | |
2325 | * espserial_init() and friends | |
2326 | * | |
2327 | * espserial_init() is called at boot-time to initialize the serial driver. | |
2328 | * --------------------------------------------------------------------- | |
2329 | */ | |
2330 | ||
2331 | /* | |
2332 | * This routine prints out the appropriate serial driver version | |
2333 | * number, and identifies which options were configured into this | |
2334 | * driver. | |
2335 | */ | |
2336 | ||
2337 | static inline void show_serial_version(void) | |
2338 | { | |
2339 | printk(KERN_INFO "%s version %s (DMA %u)\n", | |
2340 | serial_name, serial_version, dma); | |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * This routine is called by espserial_init() to initialize a specific serial | |
2345 | * port. | |
2346 | */ | |
2347 | static inline int autoconfig(struct esp_struct * info) | |
2348 | { | |
2349 | int port_detected = 0; | |
2350 | unsigned long flags; | |
2351 | ||
2352 | if (!request_region(info->port, REGION_SIZE, "esp serial")) | |
2353 | return -EIO; | |
2354 | ||
2355 | spin_lock_irqsave(&info->lock, flags); | |
2356 | /* | |
2357 | * Check for ESP card | |
2358 | */ | |
2359 | ||
2360 | if (serial_in(info, UART_ESI_BASE) == 0xf3) { | |
2361 | serial_out(info, UART_ESI_CMD1, 0x00); | |
2362 | serial_out(info, UART_ESI_CMD1, 0x01); | |
2363 | ||
2364 | if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) { | |
2365 | port_detected = 1; | |
2366 | ||
2367 | if (!(info->irq)) { | |
2368 | serial_out(info, UART_ESI_CMD1, 0x02); | |
2369 | ||
2370 | if (serial_in(info, UART_ESI_STAT1) & 0x01) | |
2371 | info->irq = 3; | |
2372 | else | |
2373 | info->irq = 4; | |
2374 | } | |
2375 | ||
2376 | ||
2377 | /* put card in enhanced mode */ | |
2378 | /* this prevents access through */ | |
2379 | /* the "old" IO ports */ | |
2380 | esp_basic_init(info); | |
2381 | ||
2382 | /* clear out MCR */ | |
2383 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
2384 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2385 | serial_out(info, UART_ESI_CMD2, 0x00); | |
2386 | } | |
2387 | } | |
2388 | if (!port_detected) | |
2389 | release_region(info->port, REGION_SIZE); | |
2390 | ||
2391 | spin_unlock_irqrestore(&info->lock, flags); | |
2392 | return (port_detected); | |
2393 | } | |
2394 | ||
2395 | static struct tty_operations esp_ops = { | |
2396 | .open = esp_open, | |
2397 | .close = rs_close, | |
2398 | .write = rs_write, | |
2399 | .put_char = rs_put_char, | |
2400 | .flush_chars = rs_flush_chars, | |
2401 | .write_room = rs_write_room, | |
2402 | .chars_in_buffer = rs_chars_in_buffer, | |
2403 | .flush_buffer = rs_flush_buffer, | |
2404 | .ioctl = rs_ioctl, | |
2405 | .throttle = rs_throttle, | |
2406 | .unthrottle = rs_unthrottle, | |
2407 | .set_termios = rs_set_termios, | |
2408 | .stop = rs_stop, | |
2409 | .start = rs_start, | |
2410 | .hangup = esp_hangup, | |
2411 | .break_ctl = esp_break, | |
2412 | .wait_until_sent = rs_wait_until_sent, | |
2413 | .tiocmget = esp_tiocmget, | |
2414 | .tiocmset = esp_tiocmset, | |
2415 | }; | |
2416 | ||
2417 | /* | |
2418 | * The serial driver boot-time initialization code! | |
2419 | */ | |
2420 | static int __init espserial_init(void) | |
2421 | { | |
2422 | int i, offset; | |
2423 | struct esp_struct * info; | |
2424 | struct esp_struct *last_primary = NULL; | |
2425 | int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380}; | |
2426 | ||
2427 | esp_driver = alloc_tty_driver(NR_PORTS); | |
2428 | if (!esp_driver) | |
2429 | return -ENOMEM; | |
2430 | ||
2431 | for (i = 0; i < NR_PRIMARY; i++) { | |
2432 | if (irq[i] != 0) { | |
2433 | if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) || | |
2434 | (irq[i] == 8) || (irq[i] == 13)) | |
2435 | irq[i] = 0; | |
2436 | else if (irq[i] == 2) | |
2437 | irq[i] = 9; | |
2438 | } | |
2439 | } | |
2440 | ||
2441 | if ((dma != 1) && (dma != 3)) | |
2442 | dma = 0; | |
2443 | ||
2444 | if ((rx_trigger < 1) || (rx_trigger > 1023)) | |
2445 | rx_trigger = 768; | |
2446 | ||
2447 | if ((tx_trigger < 1) || (tx_trigger > 1023)) | |
2448 | tx_trigger = 768; | |
2449 | ||
2450 | if ((flow_off < 1) || (flow_off > 1023)) | |
2451 | flow_off = 1016; | |
2452 | ||
2453 | if ((flow_on < 1) || (flow_on > 1023)) | |
2454 | flow_on = 944; | |
2455 | ||
2456 | if ((rx_timeout < 0) || (rx_timeout > 255)) | |
2457 | rx_timeout = 128; | |
2458 | ||
2459 | if (flow_on >= flow_off) | |
2460 | flow_on = flow_off - 1; | |
2461 | ||
2462 | show_serial_version(); | |
2463 | ||
2464 | /* Initialize the tty_driver structure */ | |
2465 | ||
2466 | esp_driver->owner = THIS_MODULE; | |
2467 | esp_driver->name = "ttyP"; | |
2468 | esp_driver->devfs_name = "tts/P"; | |
2469 | esp_driver->major = ESP_IN_MAJOR; | |
2470 | esp_driver->minor_start = 0; | |
2471 | esp_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
2472 | esp_driver->subtype = SERIAL_TYPE_NORMAL; | |
2473 | esp_driver->init_termios = tty_std_termios; | |
2474 | esp_driver->init_termios.c_cflag = | |
2475 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
2476 | esp_driver->flags = TTY_DRIVER_REAL_RAW; | |
2477 | tty_set_operations(esp_driver, &esp_ops); | |
2478 | if (tty_register_driver(esp_driver)) | |
2479 | { | |
2480 | printk(KERN_ERR "Couldn't register esp serial driver"); | |
2481 | put_tty_driver(esp_driver); | |
2482 | return 1; | |
2483 | } | |
2484 | ||
2485 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); | |
2486 | ||
2487 | if (!info) | |
2488 | { | |
2489 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); | |
2490 | tty_unregister_driver(esp_driver); | |
2491 | put_tty_driver(esp_driver); | |
2492 | return 1; | |
2493 | } | |
2494 | ||
2495 | memset((void *)info, 0, sizeof(struct esp_struct)); | |
2496 | /* rx_trigger, tx_trigger are needed by autoconfig */ | |
2497 | info->config.rx_trigger = rx_trigger; | |
2498 | info->config.tx_trigger = tx_trigger; | |
2499 | ||
2500 | i = 0; | |
2501 | offset = 0; | |
2502 | ||
2503 | do { | |
2504 | info->port = esp[i] + offset; | |
2505 | info->irq = irq[i]; | |
2506 | info->line = (i * 8) + (offset / 8); | |
2507 | ||
2508 | if (!autoconfig(info)) { | |
2509 | i++; | |
2510 | offset = 0; | |
2511 | continue; | |
2512 | } | |
2513 | ||
2514 | info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf; | |
2515 | info->flags = STD_COM_FLAGS; | |
2516 | if (info->custom_divisor) | |
2517 | info->flags |= ASYNC_SPD_CUST; | |
2518 | info->magic = ESP_MAGIC; | |
2519 | info->close_delay = 5*HZ/10; | |
2520 | info->closing_wait = 30*HZ; | |
2521 | INIT_WORK(&info->tqueue, do_softint, info); | |
2522 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
2523 | info->config.rx_timeout = rx_timeout; | |
2524 | info->config.flow_on = flow_on; | |
2525 | info->config.flow_off = flow_off; | |
2526 | info->config.pio_threshold = pio_threshold; | |
2527 | info->next_port = ports; | |
2528 | init_waitqueue_head(&info->open_wait); | |
2529 | init_waitqueue_head(&info->close_wait); | |
2530 | init_waitqueue_head(&info->delta_msr_wait); | |
2531 | init_waitqueue_head(&info->break_wait); | |
2532 | spin_lock_init(&info->lock); | |
2533 | ports = info; | |
2534 | printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ", | |
2535 | info->line, info->port, info->irq); | |
2536 | ||
2537 | if (info->line % 8) { | |
2538 | printk("secondary port\n"); | |
2539 | /* 8 port cards can't do DMA */ | |
2540 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
2541 | ||
2542 | if (last_primary) | |
2543 | last_primary->stat_flags |= ESP_STAT_NEVER_DMA; | |
2544 | } else { | |
2545 | printk("primary port\n"); | |
2546 | last_primary = info; | |
2547 | irq[i] = info->irq; | |
2548 | } | |
2549 | ||
2550 | if (!dma) | |
2551 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
2552 | ||
2553 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); | |
2554 | if (!info) | |
2555 | { | |
2556 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); | |
2557 | ||
2558 | /* allow use of the already detected ports */ | |
2559 | return 0; | |
2560 | } | |
2561 | ||
2562 | memset((void *)info, 0, sizeof(struct esp_struct)); | |
2563 | /* rx_trigger, tx_trigger are needed by autoconfig */ | |
2564 | info->config.rx_trigger = rx_trigger; | |
2565 | info->config.tx_trigger = tx_trigger; | |
2566 | ||
2567 | if (offset == 56) { | |
2568 | i++; | |
2569 | offset = 0; | |
2570 | } else { | |
2571 | offset += 8; | |
2572 | } | |
2573 | } while (i < NR_PRIMARY); | |
2574 | ||
2575 | /* free the last port memory allocation */ | |
2576 | kfree(info); | |
2577 | ||
2578 | return 0; | |
2579 | } | |
2580 | ||
2581 | static void __exit espserial_exit(void) | |
2582 | { | |
2583 | int e1; | |
2584 | struct esp_struct *temp_async; | |
2585 | struct esp_pio_buffer *pio_buf; | |
2586 | ||
2587 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
2588 | if ((e1 = tty_unregister_driver(esp_driver))) | |
2589 | printk("SERIAL: failed to unregister serial driver (%d)\n", | |
2590 | e1); | |
2591 | put_tty_driver(esp_driver); | |
2592 | ||
2593 | while (ports) { | |
2594 | if (ports->port) { | |
2595 | release_region(ports->port, REGION_SIZE); | |
2596 | } | |
2597 | temp_async = ports->next_port; | |
2598 | kfree(ports); | |
2599 | ports = temp_async; | |
2600 | } | |
2601 | ||
2602 | if (dma_buffer) | |
2603 | free_pages((unsigned long)dma_buffer, | |
2604 | get_order(DMA_BUFFER_SZ)); | |
2605 | ||
2606 | if (tmp_buf) | |
2607 | free_page((unsigned long)tmp_buf); | |
2608 | ||
2609 | while (free_pio_buf) { | |
2610 | pio_buf = free_pio_buf->next; | |
2611 | kfree(free_pio_buf); | |
2612 | free_pio_buf = pio_buf; | |
2613 | } | |
2614 | } | |
2615 | ||
2616 | module_init(espserial_init); | |
2617 | module_exit(espserial_exit); |