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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; | |
1da177e4 LT |
163 | |
164 | static inline int serial_paranoia_check(struct esp_struct *info, | |
165 | char *name, const char *routine) | |
166 | { | |
167 | #ifdef SERIAL_PARANOIA_CHECK | |
168 | static const char badmagic[] = KERN_WARNING | |
169 | "Warning: bad magic number for serial struct (%s) in %s\n"; | |
170 | static const char badinfo[] = KERN_WARNING | |
171 | "Warning: null esp_struct for (%s) in %s\n"; | |
172 | ||
173 | if (!info) { | |
174 | printk(badinfo, name, routine); | |
175 | return 1; | |
176 | } | |
177 | if (info->magic != ESP_MAGIC) { | |
178 | printk(badmagic, name, routine); | |
179 | return 1; | |
180 | } | |
181 | #endif | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static inline unsigned int serial_in(struct esp_struct *info, int offset) | |
186 | { | |
187 | return inb(info->port + offset); | |
188 | } | |
189 | ||
190 | static inline void serial_out(struct esp_struct *info, int offset, | |
191 | unsigned char value) | |
192 | { | |
193 | outb(value, info->port+offset); | |
194 | } | |
195 | ||
196 | /* | |
197 | * ------------------------------------------------------------ | |
198 | * rs_stop() and rs_start() | |
199 | * | |
200 | * This routines are called before setting or resetting tty->stopped. | |
201 | * They enable or disable transmitter interrupts, as necessary. | |
202 | * ------------------------------------------------------------ | |
203 | */ | |
204 | static void rs_stop(struct tty_struct *tty) | |
205 | { | |
206 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
207 | unsigned long flags; | |
208 | ||
209 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
210 | return; | |
211 | ||
212 | spin_lock_irqsave(&info->lock, flags); | |
213 | if (info->IER & UART_IER_THRI) { | |
214 | info->IER &= ~UART_IER_THRI; | |
215 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
216 | serial_out(info, UART_ESI_CMD2, info->IER); | |
217 | } | |
218 | spin_unlock_irqrestore(&info->lock, flags); | |
219 | } | |
220 | ||
221 | static void rs_start(struct tty_struct *tty) | |
222 | { | |
223 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
224 | unsigned long flags; | |
225 | ||
226 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
227 | return; | |
228 | ||
229 | spin_lock_irqsave(&info->lock, flags); | |
230 | if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { | |
231 | info->IER |= UART_IER_THRI; | |
232 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
233 | serial_out(info, UART_ESI_CMD2, info->IER); | |
234 | } | |
235 | spin_unlock_irqrestore(&info->lock, flags); | |
236 | } | |
237 | ||
238 | /* | |
239 | * ---------------------------------------------------------------------- | |
240 | * | |
241 | * Here starts the interrupt handling routines. All of the following | |
242 | * subroutines are declared as inline and are folded into | |
243 | * rs_interrupt(). They were separated out for readability's sake. | |
244 | * | |
245 | * Note: rs_interrupt() is a "fast" interrupt, which means that it | |
246 | * runs with interrupts turned off. People who may want to modify | |
247 | * rs_interrupt() should try to keep the interrupt handler as fast as | |
248 | * possible. After you are done making modifications, it is not a bad | |
249 | * idea to do: | |
250 | * | |
251 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
252 | * | |
253 | * and look at the resulting assemble code in serial.s. | |
254 | * | |
255 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
256 | * ----------------------------------------------------------------------- | |
257 | */ | |
258 | ||
259 | /* | |
260 | * This routine is used by the interrupt handler to schedule | |
261 | * processing in the software interrupt portion of the driver. | |
262 | */ | |
263 | static inline void rs_sched_event(struct esp_struct *info, | |
264 | int event) | |
265 | { | |
266 | info->event |= 1 << event; | |
267 | schedule_work(&info->tqueue); | |
268 | } | |
269 | ||
270 | static DEFINE_SPINLOCK(pio_lock); | |
271 | ||
272 | static inline struct esp_pio_buffer *get_pio_buffer(void) | |
273 | { | |
274 | struct esp_pio_buffer *buf; | |
275 | unsigned long flags; | |
276 | ||
277 | spin_lock_irqsave(&pio_lock, flags); | |
278 | if (free_pio_buf) { | |
279 | buf = free_pio_buf; | |
280 | free_pio_buf = buf->next; | |
281 | } else { | |
282 | buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC); | |
283 | } | |
284 | spin_unlock_irqrestore(&pio_lock, flags); | |
285 | return buf; | |
286 | } | |
287 | ||
288 | static inline void release_pio_buffer(struct esp_pio_buffer *buf) | |
289 | { | |
290 | unsigned long flags; | |
291 | spin_lock_irqsave(&pio_lock, flags); | |
292 | buf->next = free_pio_buf; | |
293 | free_pio_buf = buf; | |
294 | spin_unlock_irqrestore(&pio_lock, flags); | |
295 | } | |
296 | ||
297 | static inline void receive_chars_pio(struct esp_struct *info, int num_bytes) | |
298 | { | |
299 | struct tty_struct *tty = info->tty; | |
300 | int i; | |
301 | struct esp_pio_buffer *pio_buf; | |
302 | struct esp_pio_buffer *err_buf; | |
303 | unsigned char status_mask; | |
304 | ||
305 | pio_buf = get_pio_buffer(); | |
306 | ||
307 | if (!pio_buf) | |
308 | return; | |
309 | ||
310 | err_buf = get_pio_buffer(); | |
311 | ||
312 | if (!err_buf) { | |
313 | release_pio_buffer(pio_buf); | |
314 | return; | |
315 | } | |
316 | ||
317 | status_mask = (info->read_status_mask >> 2) & 0x07; | |
318 | ||
319 | for (i = 0; i < num_bytes - 1; i += 2) { | |
320 | *((unsigned short *)(pio_buf->data + i)) = | |
321 | inw(info->port + UART_ESI_RX); | |
322 | err_buf->data[i] = serial_in(info, UART_ESI_RWS); | |
323 | err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask; | |
324 | err_buf->data[i] &= status_mask; | |
325 | } | |
326 | ||
327 | if (num_bytes & 0x0001) { | |
328 | pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX); | |
329 | err_buf->data[num_bytes - 1] = | |
330 | (serial_in(info, UART_ESI_RWS) >> 3) & status_mask; | |
331 | } | |
332 | ||
333 | /* make sure everything is still ok since interrupts were enabled */ | |
334 | tty = info->tty; | |
335 | ||
336 | if (!tty) { | |
337 | release_pio_buffer(pio_buf); | |
338 | release_pio_buffer(err_buf); | |
339 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
340 | return; | |
341 | } | |
342 | ||
343 | status_mask = (info->ignore_status_mask >> 2) & 0x07; | |
344 | ||
345 | for (i = 0; i < num_bytes; i++) { | |
346 | if (!(err_buf->data[i] & status_mask)) { | |
33f0f88f | 347 | int flag = 0; |
1da177e4 LT |
348 | |
349 | if (err_buf->data[i] & 0x04) { | |
33f0f88f | 350 | flag = TTY_BREAK; |
1da177e4 LT |
351 | if (info->flags & ASYNC_SAK) |
352 | do_SAK(tty); | |
353 | } | |
354 | else if (err_buf->data[i] & 0x02) | |
33f0f88f | 355 | flag = TTY_FRAME; |
1da177e4 | 356 | else if (err_buf->data[i] & 0x01) |
33f0f88f AC |
357 | flag = TTY_PARITY; |
358 | tty_insert_flip_char(tty, pio_buf->data[i], flag); | |
1da177e4 LT |
359 | } |
360 | } | |
361 | ||
808249ce | 362 | tty_schedule_flip(tty); |
1da177e4 LT |
363 | |
364 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
365 | release_pio_buffer(pio_buf); | |
366 | release_pio_buffer(err_buf); | |
367 | } | |
368 | ||
369 | static inline void receive_chars_dma(struct esp_struct *info, int num_bytes) | |
370 | { | |
371 | unsigned long flags; | |
372 | info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; | |
373 | dma_bytes = num_bytes; | |
374 | info->stat_flags |= ESP_STAT_DMA_RX; | |
375 | ||
376 | flags=claim_dma_lock(); | |
377 | disable_dma(dma); | |
378 | clear_dma_ff(dma); | |
379 | set_dma_mode(dma, DMA_MODE_READ); | |
380 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
381 | set_dma_count(dma, dma_bytes); | |
382 | enable_dma(dma); | |
383 | release_dma_lock(flags); | |
384 | ||
385 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX); | |
386 | } | |
387 | ||
388 | static inline void receive_chars_dma_done(struct esp_struct *info, | |
389 | int status) | |
390 | { | |
391 | struct tty_struct *tty = info->tty; | |
392 | int num_bytes; | |
393 | unsigned long flags; | |
394 | ||
1da177e4 LT |
395 | flags=claim_dma_lock(); |
396 | disable_dma(dma); | |
397 | clear_dma_ff(dma); | |
398 | ||
399 | info->stat_flags &= ~ESP_STAT_DMA_RX; | |
400 | num_bytes = dma_bytes - get_dma_residue(dma); | |
401 | release_dma_lock(flags); | |
402 | ||
403 | info->icount.rx += num_bytes; | |
404 | ||
1da177e4 | 405 | if (num_bytes > 0) { |
33f0f88f | 406 | tty_insert_flip_string(tty, dma_buffer, num_bytes - 1); |
1da177e4 LT |
407 | |
408 | status &= (0x1c & info->read_status_mask); | |
33f0f88f AC |
409 | |
410 | /* Is the status significant or do we throw the last byte ? */ | |
411 | if (!(status & info->ignore_status_mask)) { | |
412 | int statflag = 0; | |
1da177e4 | 413 | |
33f0f88f AC |
414 | if (status & 0x10) { |
415 | statflag = TTY_BREAK; | |
416 | (info->icount.brk)++; | |
417 | if (info->flags & ASYNC_SAK) | |
418 | do_SAK(tty); | |
419 | } else if (status & 0x08) { | |
420 | statflag = TTY_FRAME; | |
421 | (info->icount.frame)++; | |
422 | } | |
423 | else if (status & 0x04) { | |
424 | statflag = TTY_PARITY; | |
425 | (info->icount.parity)++; | |
426 | } | |
427 | tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag); | |
1da177e4 | 428 | } |
808249ce | 429 | tty_schedule_flip(tty); |
1da177e4 LT |
430 | } |
431 | ||
432 | if (dma_bytes != num_bytes) { | |
433 | num_bytes = dma_bytes - num_bytes; | |
434 | dma_bytes = 0; | |
435 | receive_chars_dma(info, num_bytes); | |
436 | } else | |
437 | dma_bytes = 0; | |
438 | } | |
439 | ||
440 | /* Caller must hold info->lock */ | |
441 | ||
442 | static inline void transmit_chars_pio(struct esp_struct *info, | |
443 | int space_avail) | |
444 | { | |
445 | int i; | |
446 | struct esp_pio_buffer *pio_buf; | |
447 | ||
448 | pio_buf = get_pio_buffer(); | |
449 | ||
450 | if (!pio_buf) | |
451 | return; | |
452 | ||
453 | while (space_avail && info->xmit_cnt) { | |
454 | if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) { | |
455 | memcpy(pio_buf->data, | |
456 | &(info->xmit_buf[info->xmit_tail]), | |
457 | space_avail); | |
458 | } else { | |
459 | i = ESP_XMIT_SIZE - info->xmit_tail; | |
460 | memcpy(pio_buf->data, | |
461 | &(info->xmit_buf[info->xmit_tail]), i); | |
462 | memcpy(&(pio_buf->data[i]), info->xmit_buf, | |
463 | space_avail - i); | |
464 | } | |
465 | ||
466 | info->xmit_cnt -= space_avail; | |
467 | info->xmit_tail = (info->xmit_tail + space_avail) & | |
468 | (ESP_XMIT_SIZE - 1); | |
469 | ||
470 | for (i = 0; i < space_avail - 1; i += 2) { | |
471 | outw(*((unsigned short *)(pio_buf->data + i)), | |
472 | info->port + UART_ESI_TX); | |
473 | } | |
474 | ||
475 | if (space_avail & 0x0001) | |
476 | serial_out(info, UART_ESI_TX, | |
477 | pio_buf->data[space_avail - 1]); | |
478 | ||
479 | if (info->xmit_cnt) { | |
480 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
481 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
482 | space_avail = serial_in(info, UART_ESI_STAT1) << 8; | |
483 | space_avail |= serial_in(info, UART_ESI_STAT2); | |
484 | ||
485 | if (space_avail > info->xmit_cnt) | |
486 | space_avail = info->xmit_cnt; | |
487 | } | |
488 | } | |
489 | ||
490 | if (info->xmit_cnt < WAKEUP_CHARS) { | |
491 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); | |
492 | ||
493 | #ifdef SERIAL_DEBUG_INTR | |
494 | printk("THRE..."); | |
495 | #endif | |
496 | ||
497 | if (info->xmit_cnt <= 0) { | |
498 | info->IER &= ~UART_IER_THRI; | |
499 | serial_out(info, UART_ESI_CMD1, | |
500 | ESI_SET_SRV_MASK); | |
501 | serial_out(info, UART_ESI_CMD2, info->IER); | |
502 | } | |
503 | } | |
504 | ||
505 | release_pio_buffer(pio_buf); | |
506 | } | |
507 | ||
508 | /* Caller must hold info->lock */ | |
509 | static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes) | |
510 | { | |
511 | unsigned long flags; | |
512 | ||
513 | dma_bytes = num_bytes; | |
514 | ||
515 | if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) { | |
516 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), | |
517 | dma_bytes); | |
518 | } else { | |
519 | int i = ESP_XMIT_SIZE - info->xmit_tail; | |
520 | memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), | |
521 | i); | |
522 | memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i); | |
523 | } | |
524 | ||
525 | info->xmit_cnt -= dma_bytes; | |
526 | info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1); | |
527 | ||
528 | if (info->xmit_cnt < WAKEUP_CHARS) { | |
529 | rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP); | |
530 | ||
531 | #ifdef SERIAL_DEBUG_INTR | |
532 | printk("THRE..."); | |
533 | #endif | |
534 | ||
535 | if (info->xmit_cnt <= 0) { | |
536 | info->IER &= ~UART_IER_THRI; | |
537 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
538 | serial_out(info, UART_ESI_CMD2, info->IER); | |
539 | } | |
540 | } | |
541 | ||
542 | info->stat_flags |= ESP_STAT_DMA_TX; | |
543 | ||
544 | flags=claim_dma_lock(); | |
545 | disable_dma(dma); | |
546 | clear_dma_ff(dma); | |
547 | set_dma_mode(dma, DMA_MODE_WRITE); | |
548 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
549 | set_dma_count(dma, dma_bytes); | |
550 | enable_dma(dma); | |
551 | release_dma_lock(flags); | |
552 | ||
553 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); | |
554 | } | |
555 | ||
556 | static inline void transmit_chars_dma_done(struct esp_struct *info) | |
557 | { | |
558 | int num_bytes; | |
559 | unsigned long flags; | |
560 | ||
561 | ||
562 | flags=claim_dma_lock(); | |
563 | disable_dma(dma); | |
564 | clear_dma_ff(dma); | |
565 | ||
566 | num_bytes = dma_bytes - get_dma_residue(dma); | |
567 | info->icount.tx += dma_bytes; | |
568 | release_dma_lock(flags); | |
569 | ||
570 | if (dma_bytes != num_bytes) { | |
571 | dma_bytes -= num_bytes; | |
572 | memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes); | |
573 | ||
574 | flags=claim_dma_lock(); | |
575 | disable_dma(dma); | |
576 | clear_dma_ff(dma); | |
577 | set_dma_mode(dma, DMA_MODE_WRITE); | |
578 | set_dma_addr(dma, isa_virt_to_bus(dma_buffer)); | |
579 | set_dma_count(dma, dma_bytes); | |
580 | enable_dma(dma); | |
581 | release_dma_lock(flags); | |
582 | ||
583 | serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); | |
584 | } else { | |
585 | dma_bytes = 0; | |
586 | info->stat_flags &= ~ESP_STAT_DMA_TX; | |
587 | } | |
588 | } | |
589 | ||
590 | static inline void check_modem_status(struct esp_struct *info) | |
591 | { | |
592 | int status; | |
593 | ||
594 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
595 | status = serial_in(info, UART_ESI_STAT2); | |
596 | ||
597 | if (status & UART_MSR_ANY_DELTA) { | |
598 | /* update input line counters */ | |
599 | if (status & UART_MSR_TERI) | |
600 | info->icount.rng++; | |
601 | if (status & UART_MSR_DDSR) | |
602 | info->icount.dsr++; | |
603 | if (status & UART_MSR_DDCD) | |
604 | info->icount.dcd++; | |
605 | if (status & UART_MSR_DCTS) | |
606 | info->icount.cts++; | |
607 | wake_up_interruptible(&info->delta_msr_wait); | |
608 | } | |
609 | ||
610 | if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { | |
611 | #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) | |
612 | printk("ttys%d CD now %s...", info->line, | |
613 | (status & UART_MSR_DCD) ? "on" : "off"); | |
614 | #endif | |
615 | if (status & UART_MSR_DCD) | |
616 | wake_up_interruptible(&info->open_wait); | |
617 | else { | |
618 | #ifdef SERIAL_DEBUG_OPEN | |
619 | printk("scheduling hangup..."); | |
620 | #endif | |
621 | schedule_work(&info->tqueue_hangup); | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
626 | /* | |
627 | * This is the serial driver's interrupt routine | |
628 | */ | |
629 | static irqreturn_t rs_interrupt_single(int irq, void *dev_id, | |
630 | struct pt_regs *regs) | |
631 | { | |
632 | struct esp_struct * info; | |
633 | unsigned err_status; | |
634 | unsigned int scratch; | |
635 | ||
636 | #ifdef SERIAL_DEBUG_INTR | |
637 | printk("rs_interrupt_single(%d)...", irq); | |
638 | #endif | |
639 | info = (struct esp_struct *)dev_id; | |
640 | err_status = 0; | |
641 | scratch = serial_in(info, UART_ESI_SID); | |
642 | ||
643 | spin_lock(&info->lock); | |
644 | ||
645 | if (!info->tty) { | |
646 | spin_unlock(&info->lock); | |
647 | return IRQ_NONE; | |
648 | } | |
649 | ||
650 | if (scratch & 0x04) { /* error */ | |
651 | serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT); | |
652 | err_status = serial_in(info, UART_ESI_STAT1); | |
653 | serial_in(info, UART_ESI_STAT2); | |
654 | ||
655 | if (err_status & 0x01) | |
656 | info->stat_flags |= ESP_STAT_RX_TIMEOUT; | |
657 | ||
658 | if (err_status & 0x20) /* UART status */ | |
659 | check_modem_status(info); | |
660 | ||
661 | if (err_status & 0x80) /* Start break */ | |
662 | wake_up_interruptible(&info->break_wait); | |
663 | } | |
664 | ||
665 | if ((scratch & 0x88) || /* DMA completed or timed out */ | |
666 | (err_status & 0x1c) /* receive error */) { | |
667 | if (info->stat_flags & ESP_STAT_DMA_RX) | |
668 | receive_chars_dma_done(info, err_status); | |
669 | else if (info->stat_flags & ESP_STAT_DMA_TX) | |
670 | transmit_chars_dma_done(info); | |
671 | } | |
672 | ||
673 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && | |
674 | ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) && | |
675 | (info->IER & UART_IER_RDI)) { | |
676 | int num_bytes; | |
677 | ||
678 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
679 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); | |
680 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; | |
681 | num_bytes |= serial_in(info, UART_ESI_STAT2); | |
682 | ||
33f0f88f | 683 | num_bytes = tty_buffer_request_room(info->tty, num_bytes); |
1da177e4 LT |
684 | |
685 | if (num_bytes) { | |
686 | if (dma_bytes || | |
687 | (info->stat_flags & ESP_STAT_USE_PIO) || | |
688 | (num_bytes <= info->config.pio_threshold)) | |
689 | receive_chars_pio(info, num_bytes); | |
690 | else | |
691 | receive_chars_dma(info, num_bytes); | |
692 | } | |
693 | } | |
694 | ||
695 | if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && | |
696 | (scratch & 0x02) && (info->IER & UART_IER_THRI)) { | |
697 | if ((info->xmit_cnt <= 0) || info->tty->stopped) { | |
698 | info->IER &= ~UART_IER_THRI; | |
699 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
700 | serial_out(info, UART_ESI_CMD2, info->IER); | |
701 | } else { | |
702 | int num_bytes; | |
703 | ||
704 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
705 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
706 | num_bytes = serial_in(info, UART_ESI_STAT1) << 8; | |
707 | num_bytes |= serial_in(info, UART_ESI_STAT2); | |
708 | ||
709 | if (num_bytes > info->xmit_cnt) | |
710 | num_bytes = info->xmit_cnt; | |
711 | ||
712 | if (num_bytes) { | |
713 | if (dma_bytes || | |
714 | (info->stat_flags & ESP_STAT_USE_PIO) || | |
715 | (num_bytes <= info->config.pio_threshold)) | |
716 | transmit_chars_pio(info, num_bytes); | |
717 | else | |
718 | transmit_chars_dma(info, num_bytes); | |
719 | } | |
720 | } | |
721 | } | |
722 | ||
723 | info->last_active = jiffies; | |
724 | ||
725 | #ifdef SERIAL_DEBUG_INTR | |
726 | printk("end.\n"); | |
727 | #endif | |
728 | spin_unlock(&info->lock); | |
729 | return IRQ_HANDLED; | |
730 | } | |
731 | ||
732 | /* | |
733 | * ------------------------------------------------------------------- | |
734 | * Here ends the serial interrupt routines. | |
735 | * ------------------------------------------------------------------- | |
736 | */ | |
737 | ||
738 | static void do_softint(void *private_) | |
739 | { | |
740 | struct esp_struct *info = (struct esp_struct *) private_; | |
741 | struct tty_struct *tty; | |
742 | ||
743 | tty = info->tty; | |
744 | if (!tty) | |
745 | return; | |
746 | ||
747 | if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) { | |
748 | tty_wakeup(tty); | |
749 | } | |
750 | } | |
751 | ||
752 | /* | |
753 | * This routine is called from the scheduler tqueue when the interrupt | |
754 | * routine has signalled that a hangup has occurred. The path of | |
755 | * hangup processing is: | |
756 | * | |
757 | * serial interrupt routine -> (scheduler tqueue) -> | |
758 | * do_serial_hangup() -> tty->hangup() -> esp_hangup() | |
759 | * | |
760 | */ | |
761 | static void do_serial_hangup(void *private_) | |
762 | { | |
763 | struct esp_struct *info = (struct esp_struct *) private_; | |
764 | struct tty_struct *tty; | |
765 | ||
766 | tty = info->tty; | |
767 | if (tty) | |
768 | tty_hangup(tty); | |
769 | } | |
770 | ||
771 | /* | |
772 | * --------------------------------------------------------------- | |
773 | * Low level utility subroutines for the serial driver: routines to | |
774 | * figure out the appropriate timeout for an interrupt chain, routines | |
775 | * to initialize and startup a serial port, and routines to shutdown a | |
776 | * serial port. Useful stuff like that. | |
777 | * | |
778 | * Caller should hold lock | |
779 | * --------------------------------------------------------------- | |
780 | */ | |
781 | ||
782 | static inline void esp_basic_init(struct esp_struct * info) | |
783 | { | |
784 | /* put ESPC in enhanced mode */ | |
785 | serial_out(info, UART_ESI_CMD1, ESI_SET_MODE); | |
786 | ||
787 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
788 | serial_out(info, UART_ESI_CMD2, 0x01); | |
789 | else | |
790 | serial_out(info, UART_ESI_CMD2, 0x31); | |
791 | ||
792 | /* disable interrupts for now */ | |
793 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
794 | serial_out(info, UART_ESI_CMD2, 0x00); | |
795 | ||
796 | /* set interrupt and DMA channel */ | |
797 | serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ); | |
798 | ||
799 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
800 | serial_out(info, UART_ESI_CMD2, 0x01); | |
801 | else | |
802 | serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01); | |
803 | ||
804 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); | |
805 | ||
806 | if (info->line % 8) /* secondary port */ | |
807 | serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */ | |
808 | else if (info->irq == 9) | |
809 | serial_out(info, UART_ESI_CMD2, 0x02); | |
810 | else | |
811 | serial_out(info, UART_ESI_CMD2, info->irq); | |
812 | ||
813 | /* set error status mask (check this) */ | |
814 | serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK); | |
815 | ||
816 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
817 | serial_out(info, UART_ESI_CMD2, 0xa1); | |
818 | else | |
819 | serial_out(info, UART_ESI_CMD2, 0xbd); | |
820 | ||
821 | serial_out(info, UART_ESI_CMD2, 0x00); | |
822 | ||
823 | /* set DMA timeout */ | |
824 | serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT); | |
825 | serial_out(info, UART_ESI_CMD2, 0xff); | |
826 | ||
827 | /* set FIFO trigger levels */ | |
828 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); | |
829 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8); | |
830 | serial_out(info, UART_ESI_CMD2, info->config.rx_trigger); | |
831 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8); | |
832 | serial_out(info, UART_ESI_CMD2, info->config.tx_trigger); | |
833 | ||
834 | /* Set clock scaling and wait states */ | |
835 | serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR); | |
836 | serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE); | |
837 | ||
838 | /* set reinterrupt pacing */ | |
839 | serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR); | |
840 | serial_out(info, UART_ESI_CMD2, 0xff); | |
841 | } | |
842 | ||
843 | static int startup(struct esp_struct * info) | |
844 | { | |
845 | unsigned long flags; | |
846 | int retval=0; | |
847 | unsigned int num_chars; | |
848 | ||
849 | spin_lock_irqsave(&info->lock, flags); | |
850 | ||
851 | if (info->flags & ASYNC_INITIALIZED) | |
852 | goto out; | |
853 | ||
854 | if (!info->xmit_buf) { | |
855 | info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC); | |
856 | retval = -ENOMEM; | |
857 | if (!info->xmit_buf) | |
858 | goto out; | |
859 | } | |
860 | ||
861 | #ifdef SERIAL_DEBUG_OPEN | |
862 | printk("starting up ttys%d (irq %d)...", info->line, info->irq); | |
863 | #endif | |
864 | ||
865 | /* Flush the RX buffer. Using the ESI flush command may cause */ | |
866 | /* wild interrupts, so read all the data instead. */ | |
867 | ||
868 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
869 | serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); | |
870 | num_chars = serial_in(info, UART_ESI_STAT1) << 8; | |
871 | num_chars |= serial_in(info, UART_ESI_STAT2); | |
872 | ||
873 | while (num_chars > 1) { | |
874 | inw(info->port + UART_ESI_RX); | |
875 | num_chars -= 2; | |
876 | } | |
877 | ||
878 | if (num_chars) | |
879 | serial_in(info, UART_ESI_RX); | |
880 | ||
881 | /* set receive character timeout */ | |
882 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
883 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); | |
884 | ||
885 | /* clear all flags except the "never DMA" flag */ | |
886 | info->stat_flags &= ESP_STAT_NEVER_DMA; | |
887 | ||
888 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
889 | info->stat_flags |= ESP_STAT_USE_PIO; | |
890 | ||
891 | spin_unlock_irqrestore(&info->lock, flags); | |
892 | ||
893 | /* | |
894 | * Allocate the IRQ | |
895 | */ | |
896 | ||
897 | retval = request_irq(info->irq, rs_interrupt_single, SA_SHIRQ, | |
898 | "esp serial", info); | |
899 | ||
900 | if (retval) { | |
901 | if (capable(CAP_SYS_ADMIN)) { | |
902 | if (info->tty) | |
903 | set_bit(TTY_IO_ERROR, | |
904 | &info->tty->flags); | |
905 | retval = 0; | |
906 | } | |
907 | goto out_unlocked; | |
908 | } | |
909 | ||
910 | if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) { | |
911 | dma_buffer = (char *)__get_dma_pages( | |
912 | GFP_KERNEL, get_order(DMA_BUFFER_SZ)); | |
913 | ||
914 | /* use PIO mode if DMA buf/chan cannot be allocated */ | |
915 | if (!dma_buffer) | |
916 | info->stat_flags |= ESP_STAT_USE_PIO; | |
917 | else if (request_dma(dma, "esp serial")) { | |
918 | free_pages((unsigned long)dma_buffer, | |
919 | get_order(DMA_BUFFER_SZ)); | |
920 | dma_buffer = NULL; | |
921 | info->stat_flags |= ESP_STAT_USE_PIO; | |
922 | } | |
923 | ||
924 | } | |
925 | ||
926 | info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2; | |
927 | ||
928 | spin_lock_irqsave(&info->lock, flags); | |
929 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
930 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
931 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
932 | ||
933 | /* | |
934 | * Finally, enable interrupts | |
935 | */ | |
936 | /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */ | |
937 | info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT | | |
938 | UART_IER_DMA_TC; | |
939 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
940 | serial_out(info, UART_ESI_CMD2, info->IER); | |
941 | ||
942 | if (info->tty) | |
943 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
944 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
945 | spin_unlock_irqrestore(&info->lock, flags); | |
946 | ||
947 | /* | |
948 | * Set up the tty->alt_speed kludge | |
949 | */ | |
950 | if (info->tty) { | |
951 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
952 | info->tty->alt_speed = 57600; | |
953 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
954 | info->tty->alt_speed = 115200; | |
955 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
956 | info->tty->alt_speed = 230400; | |
957 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
958 | info->tty->alt_speed = 460800; | |
959 | } | |
960 | ||
961 | /* | |
962 | * set the speed of the serial port | |
963 | */ | |
964 | change_speed(info); | |
965 | info->flags |= ASYNC_INITIALIZED; | |
966 | return 0; | |
967 | ||
968 | out: | |
969 | spin_unlock_irqrestore(&info->lock, flags); | |
970 | out_unlocked: | |
971 | return retval; | |
972 | } | |
973 | ||
974 | /* | |
975 | * This routine will shutdown a serial port; interrupts are disabled, and | |
976 | * DTR is dropped if the hangup on close termio flag is on. | |
977 | */ | |
978 | static void shutdown(struct esp_struct * info) | |
979 | { | |
980 | unsigned long flags, f; | |
981 | ||
982 | if (!(info->flags & ASYNC_INITIALIZED)) | |
983 | return; | |
984 | ||
985 | #ifdef SERIAL_DEBUG_OPEN | |
986 | printk("Shutting down serial port %d (irq %d)....", info->line, | |
987 | info->irq); | |
988 | #endif | |
989 | ||
990 | spin_lock_irqsave(&info->lock, flags); | |
991 | /* | |
992 | * clear delta_msr_wait queue to avoid mem leaks: we may free the irq | |
993 | * here so the queue might never be waken up | |
994 | */ | |
995 | wake_up_interruptible(&info->delta_msr_wait); | |
996 | wake_up_interruptible(&info->break_wait); | |
997 | ||
998 | /* stop a DMA transfer on the port being closed */ | |
999 | /* DMA lock is higher priority always */ | |
1000 | if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) { | |
1001 | f=claim_dma_lock(); | |
1002 | disable_dma(dma); | |
1003 | clear_dma_ff(dma); | |
1004 | release_dma_lock(f); | |
1005 | ||
1006 | dma_bytes = 0; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Free the IRQ | |
1011 | */ | |
1012 | free_irq(info->irq, info); | |
1013 | ||
1014 | if (dma_buffer) { | |
1015 | struct esp_struct *current_port = ports; | |
1016 | ||
1017 | while (current_port) { | |
1018 | if ((current_port != info) && | |
1019 | (current_port->flags & ASYNC_INITIALIZED)) | |
1020 | break; | |
1021 | ||
1022 | current_port = current_port->next_port; | |
1023 | } | |
1024 | ||
1025 | if (!current_port) { | |
1026 | free_dma(dma); | |
1027 | free_pages((unsigned long)dma_buffer, | |
1028 | get_order(DMA_BUFFER_SZ)); | |
1029 | dma_buffer = NULL; | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | if (info->xmit_buf) { | |
1034 | free_page((unsigned long) info->xmit_buf); | |
1035 | info->xmit_buf = NULL; | |
1036 | } | |
1037 | ||
1038 | info->IER = 0; | |
1039 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1040 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1041 | ||
1042 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
1043 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); | |
1044 | ||
1045 | info->MCR &= ~UART_MCR_OUT2; | |
1046 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1047 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1048 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1049 | ||
1050 | if (info->tty) | |
1051 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
1052 | ||
1053 | info->flags &= ~ASYNC_INITIALIZED; | |
1054 | spin_unlock_irqrestore(&info->lock, flags); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * This routine is called to set the UART divisor registers to match | |
1059 | * the specified baud rate for a serial port. | |
1060 | */ | |
1061 | static void change_speed(struct esp_struct *info) | |
1062 | { | |
1063 | unsigned short port; | |
1064 | int quot = 0; | |
1065 | unsigned cflag,cval; | |
1066 | int baud, bits; | |
1067 | unsigned char flow1 = 0, flow2 = 0; | |
1068 | unsigned long flags; | |
1069 | ||
1070 | if (!info->tty || !info->tty->termios) | |
1071 | return; | |
1072 | cflag = info->tty->termios->c_cflag; | |
1073 | port = info->port; | |
1074 | ||
1075 | /* byte size and parity */ | |
1076 | switch (cflag & CSIZE) { | |
1077 | case CS5: cval = 0x00; bits = 7; break; | |
1078 | case CS6: cval = 0x01; bits = 8; break; | |
1079 | case CS7: cval = 0x02; bits = 9; break; | |
1080 | case CS8: cval = 0x03; bits = 10; break; | |
1081 | default: cval = 0x00; bits = 7; break; | |
1082 | } | |
1083 | if (cflag & CSTOPB) { | |
1084 | cval |= 0x04; | |
1085 | bits++; | |
1086 | } | |
1087 | if (cflag & PARENB) { | |
1088 | cval |= UART_LCR_PARITY; | |
1089 | bits++; | |
1090 | } | |
1091 | if (!(cflag & PARODD)) | |
1092 | cval |= UART_LCR_EPAR; | |
1093 | #ifdef CMSPAR | |
1094 | if (cflag & CMSPAR) | |
1095 | cval |= UART_LCR_SPAR; | |
1096 | #endif | |
1097 | ||
1098 | baud = tty_get_baud_rate(info->tty); | |
1099 | if (baud == 38400 && | |
1100 | ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) | |
1101 | quot = info->custom_divisor; | |
1102 | else { | |
1103 | if (baud == 134) | |
1104 | /* Special case since 134 is really 134.5 */ | |
1105 | quot = (2*BASE_BAUD / 269); | |
1106 | else if (baud) | |
1107 | quot = BASE_BAUD / baud; | |
1108 | } | |
1109 | /* If the quotient is ever zero, default to 9600 bps */ | |
1110 | if (!quot) | |
1111 | quot = BASE_BAUD / 9600; | |
1112 | ||
1113 | info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50); | |
1114 | ||
1115 | /* CTS flow control flag and modem status interrupts */ | |
1116 | /* info->IER &= ~UART_IER_MSI; */ | |
1117 | if (cflag & CRTSCTS) { | |
1118 | info->flags |= ASYNC_CTS_FLOW; | |
1119 | /* info->IER |= UART_IER_MSI; */ | |
1120 | flow1 = 0x04; | |
1121 | flow2 = 0x10; | |
1122 | } else | |
1123 | info->flags &= ~ASYNC_CTS_FLOW; | |
1124 | if (cflag & CLOCAL) | |
1125 | info->flags &= ~ASYNC_CHECK_CD; | |
1126 | else { | |
1127 | info->flags |= ASYNC_CHECK_CD; | |
1128 | /* info->IER |= UART_IER_MSI; */ | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Set up parity check flag | |
1133 | */ | |
1134 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
1135 | ||
1136 | info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
1137 | if (I_INPCK(info->tty)) | |
1138 | info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
1139 | if (I_BRKINT(info->tty) || I_PARMRK(info->tty)) | |
1140 | info->read_status_mask |= UART_LSR_BI; | |
1141 | ||
1142 | info->ignore_status_mask = 0; | |
1143 | #if 0 | |
1144 | /* This should be safe, but for some broken bits of hardware... */ | |
1145 | if (I_IGNPAR(info->tty)) { | |
1146 | info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
1147 | info->read_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
1148 | } | |
1149 | #endif | |
1150 | if (I_IGNBRK(info->tty)) { | |
1151 | info->ignore_status_mask |= UART_LSR_BI; | |
1152 | info->read_status_mask |= UART_LSR_BI; | |
1153 | /* | |
1154 | * If we're ignore parity and break indicators, ignore | |
1155 | * overruns too. (For real raw support). | |
1156 | */ | |
1157 | if (I_IGNPAR(info->tty)) { | |
1158 | info->ignore_status_mask |= UART_LSR_OE | \ | |
1159 | UART_LSR_PE | UART_LSR_FE; | |
1160 | info->read_status_mask |= UART_LSR_OE | \ | |
1161 | UART_LSR_PE | UART_LSR_FE; | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | if (I_IXOFF(info->tty)) | |
1166 | flow1 |= 0x81; | |
1167 | ||
1168 | spin_lock_irqsave(&info->lock, flags); | |
1169 | /* set baud */ | |
1170 | serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD); | |
1171 | serial_out(info, UART_ESI_CMD2, quot >> 8); | |
1172 | serial_out(info, UART_ESI_CMD2, quot & 0xff); | |
1173 | ||
1174 | /* set data bits, parity, etc. */ | |
1175 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1176 | serial_out(info, UART_ESI_CMD2, UART_LCR); | |
1177 | serial_out(info, UART_ESI_CMD2, cval); | |
1178 | ||
1179 | /* Enable flow control */ | |
1180 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL); | |
1181 | serial_out(info, UART_ESI_CMD2, flow1); | |
1182 | serial_out(info, UART_ESI_CMD2, flow2); | |
1183 | ||
1184 | /* set flow control characters (XON/XOFF only) */ | |
1185 | if (I_IXOFF(info->tty)) { | |
1186 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS); | |
1187 | serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty)); | |
1188 | serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty)); | |
1189 | serial_out(info, UART_ESI_CMD2, 0x10); | |
1190 | serial_out(info, UART_ESI_CMD2, 0x21); | |
1191 | switch (cflag & CSIZE) { | |
1192 | case CS5: | |
1193 | serial_out(info, UART_ESI_CMD2, 0x1f); | |
1194 | break; | |
1195 | case CS6: | |
1196 | serial_out(info, UART_ESI_CMD2, 0x3f); | |
1197 | break; | |
1198 | case CS7: | |
1199 | case CS8: | |
1200 | serial_out(info, UART_ESI_CMD2, 0x7f); | |
1201 | break; | |
1202 | default: | |
1203 | serial_out(info, UART_ESI_CMD2, 0xff); | |
1204 | break; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | /* Set high/low water */ | |
1209 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); | |
1210 | serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8); | |
1211 | serial_out(info, UART_ESI_CMD2, info->config.flow_off); | |
1212 | serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8); | |
1213 | serial_out(info, UART_ESI_CMD2, info->config.flow_on); | |
1214 | ||
1215 | spin_unlock_irqrestore(&info->lock, flags); | |
1216 | } | |
1217 | ||
1218 | static void rs_put_char(struct tty_struct *tty, unsigned char ch) | |
1219 | { | |
1220 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1221 | unsigned long flags; | |
1222 | ||
1223 | if (serial_paranoia_check(info, tty->name, "rs_put_char")) | |
1224 | return; | |
1225 | ||
1226 | if (!tty || !info->xmit_buf) | |
1227 | return; | |
1228 | ||
1229 | spin_lock_irqsave(&info->lock, flags); | |
1230 | if (info->xmit_cnt < ESP_XMIT_SIZE - 1) { | |
1231 | info->xmit_buf[info->xmit_head++] = ch; | |
1232 | info->xmit_head &= ESP_XMIT_SIZE-1; | |
1233 | info->xmit_cnt++; | |
1234 | } | |
1235 | spin_unlock_irqrestore(&info->lock, flags); | |
1236 | } | |
1237 | ||
1238 | static void rs_flush_chars(struct tty_struct *tty) | |
1239 | { | |
1240 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1241 | unsigned long flags; | |
1242 | ||
1243 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
1244 | return; | |
1245 | ||
1246 | spin_lock_irqsave(&info->lock, flags); | |
1247 | ||
1248 | if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf) | |
1249 | goto out; | |
1250 | ||
1251 | if (!(info->IER & UART_IER_THRI)) { | |
1252 | info->IER |= UART_IER_THRI; | |
1253 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1254 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1255 | } | |
1256 | out: | |
1257 | spin_unlock_irqrestore(&info->lock, flags); | |
1258 | } | |
1259 | ||
1260 | static int rs_write(struct tty_struct * tty, | |
1261 | const unsigned char *buf, int count) | |
1262 | { | |
1263 | int c, t, ret = 0; | |
1264 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1265 | unsigned long flags; | |
1266 | ||
1267 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
1268 | return 0; | |
1269 | ||
1270 | if (!tty || !info->xmit_buf || !tmp_buf) | |
1271 | return 0; | |
1272 | ||
1273 | while (1) { | |
1274 | /* Thanks to R. Wolff for suggesting how to do this with */ | |
1275 | /* interrupts enabled */ | |
1276 | ||
1277 | c = count; | |
1278 | t = ESP_XMIT_SIZE - info->xmit_cnt - 1; | |
1279 | ||
1280 | if (t < c) | |
1281 | c = t; | |
1282 | ||
1283 | t = ESP_XMIT_SIZE - info->xmit_head; | |
1284 | ||
1285 | if (t < c) | |
1286 | c = t; | |
1287 | ||
1288 | if (c <= 0) | |
1289 | break; | |
1290 | ||
1291 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
1292 | ||
1293 | info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1); | |
1294 | info->xmit_cnt += c; | |
1295 | buf += c; | |
1296 | count -= c; | |
1297 | ret += c; | |
1298 | } | |
1299 | ||
1300 | spin_lock_irqsave(&info->lock, flags); | |
1301 | ||
1302 | if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) { | |
1303 | info->IER |= UART_IER_THRI; | |
1304 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1305 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1306 | } | |
1307 | ||
1308 | spin_unlock_irqrestore(&info->lock, flags); | |
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | static int rs_write_room(struct tty_struct *tty) | |
1313 | { | |
1314 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1315 | int ret; | |
1316 | unsigned long flags; | |
1317 | ||
1318 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
1319 | return 0; | |
1320 | ||
1321 | spin_lock_irqsave(&info->lock, flags); | |
1322 | ||
1323 | ret = ESP_XMIT_SIZE - info->xmit_cnt - 1; | |
1324 | if (ret < 0) | |
1325 | ret = 0; | |
1326 | spin_unlock_irqrestore(&info->lock, flags); | |
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
1331 | { | |
1332 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1333 | ||
1334 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
1335 | return 0; | |
1336 | return info->xmit_cnt; | |
1337 | } | |
1338 | ||
1339 | static void rs_flush_buffer(struct tty_struct *tty) | |
1340 | { | |
1341 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1342 | unsigned long flags; | |
1343 | ||
1344 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
1345 | return; | |
1346 | spin_lock_irqsave(&info->lock, flags); | |
1347 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
1348 | spin_unlock_irqrestore(&info->lock, flags); | |
1349 | tty_wakeup(tty); | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * ------------------------------------------------------------ | |
1354 | * rs_throttle() | |
1355 | * | |
1356 | * This routine is called by the upper-layer tty layer to signal that | |
1357 | * incoming characters should be throttled. | |
1358 | * ------------------------------------------------------------ | |
1359 | */ | |
1360 | static void rs_throttle(struct tty_struct * tty) | |
1361 | { | |
1362 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1363 | unsigned long flags; | |
1364 | #ifdef SERIAL_DEBUG_THROTTLE | |
1365 | char buf[64]; | |
1366 | ||
1367 | printk("throttle %s: %d....\n", tty_name(tty, buf), | |
1368 | tty->ldisc.chars_in_buffer(tty)); | |
1369 | #endif | |
1370 | ||
1371 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
1372 | return; | |
1373 | ||
1374 | spin_lock_irqsave(&info->lock, flags); | |
1375 | info->IER &= ~UART_IER_RDI; | |
1376 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1377 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1378 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
1379 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1380 | spin_unlock_irqrestore(&info->lock, flags); | |
1381 | } | |
1382 | ||
1383 | static void rs_unthrottle(struct tty_struct * tty) | |
1384 | { | |
1385 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1386 | unsigned long flags; | |
1387 | #ifdef SERIAL_DEBUG_THROTTLE | |
1388 | char buf[64]; | |
1389 | ||
1390 | printk("unthrottle %s: %d....\n", tty_name(tty, buf), | |
1391 | tty->ldisc.chars_in_buffer(tty)); | |
1392 | #endif | |
1393 | ||
1394 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
1395 | return; | |
1396 | ||
1397 | spin_lock_irqsave(&info->lock, flags); | |
1398 | info->IER |= UART_IER_RDI; | |
1399 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
1400 | serial_out(info, UART_ESI_CMD2, info->IER); | |
1401 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
1402 | serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); | |
1403 | spin_unlock_irqrestore(&info->lock, flags); | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * ------------------------------------------------------------ | |
1408 | * rs_ioctl() and friends | |
1409 | * ------------------------------------------------------------ | |
1410 | */ | |
1411 | ||
1412 | static int get_serial_info(struct esp_struct * info, | |
1413 | struct serial_struct __user *retinfo) | |
1414 | { | |
1415 | struct serial_struct tmp; | |
1416 | ||
1417 | memset(&tmp, 0, sizeof(tmp)); | |
1418 | tmp.type = PORT_16550A; | |
1419 | tmp.line = info->line; | |
1420 | tmp.port = info->port; | |
1421 | tmp.irq = info->irq; | |
1422 | tmp.flags = info->flags; | |
1423 | tmp.xmit_fifo_size = 1024; | |
1424 | tmp.baud_base = BASE_BAUD; | |
1425 | tmp.close_delay = info->close_delay; | |
1426 | tmp.closing_wait = info->closing_wait; | |
1427 | tmp.custom_divisor = info->custom_divisor; | |
1428 | tmp.hub6 = 0; | |
1429 | if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) | |
1430 | return -EFAULT; | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int get_esp_config(struct esp_struct * info, | |
1435 | struct hayes_esp_config __user *retinfo) | |
1436 | { | |
1437 | struct hayes_esp_config tmp; | |
1438 | ||
1439 | if (!retinfo) | |
1440 | return -EFAULT; | |
1441 | ||
1442 | memset(&tmp, 0, sizeof(tmp)); | |
1443 | tmp.rx_timeout = info->config.rx_timeout; | |
1444 | tmp.rx_trigger = info->config.rx_trigger; | |
1445 | tmp.tx_trigger = info->config.tx_trigger; | |
1446 | tmp.flow_off = info->config.flow_off; | |
1447 | tmp.flow_on = info->config.flow_on; | |
1448 | tmp.pio_threshold = info->config.pio_threshold; | |
1449 | tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma); | |
1450 | ||
1451 | return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; | |
1452 | } | |
1453 | ||
1454 | static int set_serial_info(struct esp_struct * info, | |
1455 | struct serial_struct __user *new_info) | |
1456 | { | |
1457 | struct serial_struct new_serial; | |
1458 | struct esp_struct old_info; | |
1459 | unsigned int change_irq; | |
1460 | int retval = 0; | |
1461 | struct esp_struct *current_async; | |
1462 | ||
1463 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
1464 | return -EFAULT; | |
1465 | old_info = *info; | |
1466 | ||
1467 | if ((new_serial.type != PORT_16550A) || | |
1468 | (new_serial.hub6) || | |
1469 | (info->port != new_serial.port) || | |
1470 | (new_serial.baud_base != BASE_BAUD) || | |
1471 | (new_serial.irq > 15) || | |
1472 | (new_serial.irq < 2) || | |
1473 | (new_serial.irq == 6) || | |
1474 | (new_serial.irq == 8) || | |
1475 | (new_serial.irq == 13)) | |
1476 | return -EINVAL; | |
1477 | ||
1478 | change_irq = new_serial.irq != info->irq; | |
1479 | ||
1480 | if (change_irq && (info->line % 8)) | |
1481 | return -EINVAL; | |
1482 | ||
1483 | if (!capable(CAP_SYS_ADMIN)) { | |
1484 | if (change_irq || | |
1485 | (new_serial.close_delay != info->close_delay) || | |
1486 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
1487 | (info->flags & ~ASYNC_USR_MASK))) | |
1488 | return -EPERM; | |
1489 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
1490 | (new_serial.flags & ASYNC_USR_MASK)); | |
1491 | info->custom_divisor = new_serial.custom_divisor; | |
1492 | } else { | |
1493 | if (new_serial.irq == 2) | |
1494 | new_serial.irq = 9; | |
1495 | ||
1496 | if (change_irq) { | |
1497 | current_async = ports; | |
1498 | ||
1499 | while (current_async) { | |
1500 | if ((current_async->line >= info->line) && | |
1501 | (current_async->line < (info->line + 8))) { | |
1502 | if (current_async == info) { | |
1503 | if (current_async->count > 1) | |
1504 | return -EBUSY; | |
1505 | } else if (current_async->count) | |
1506 | return -EBUSY; | |
1507 | } | |
1508 | ||
1509 | current_async = current_async->next_port; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | /* | |
1514 | * OK, past this point, all the error checking has been done. | |
1515 | * At this point, we start making changes..... | |
1516 | */ | |
1517 | ||
1518 | info->flags = ((info->flags & ~ASYNC_FLAGS) | | |
1519 | (new_serial.flags & ASYNC_FLAGS)); | |
1520 | info->custom_divisor = new_serial.custom_divisor; | |
1521 | info->close_delay = new_serial.close_delay * HZ/100; | |
1522 | info->closing_wait = new_serial.closing_wait * HZ/100; | |
1523 | ||
1524 | if (change_irq) { | |
1525 | /* | |
1526 | * We need to shutdown the serial port at the old | |
1527 | * port/irq combination. | |
1528 | */ | |
1529 | shutdown(info); | |
1530 | ||
1531 | current_async = ports; | |
1532 | ||
1533 | while (current_async) { | |
1534 | if ((current_async->line >= info->line) && | |
1535 | (current_async->line < (info->line + 8))) | |
1536 | current_async->irq = new_serial.irq; | |
1537 | ||
1538 | current_async = current_async->next_port; | |
1539 | } | |
1540 | ||
1541 | serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); | |
1542 | if (info->irq == 9) | |
1543 | serial_out(info, UART_ESI_CMD2, 0x02); | |
1544 | else | |
1545 | serial_out(info, UART_ESI_CMD2, info->irq); | |
1546 | } | |
1547 | } | |
1548 | ||
1549 | if (info->flags & ASYNC_INITIALIZED) { | |
1550 | if (((old_info.flags & ASYNC_SPD_MASK) != | |
1551 | (info->flags & ASYNC_SPD_MASK)) || | |
1552 | (old_info.custom_divisor != info->custom_divisor)) { | |
1553 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) | |
1554 | info->tty->alt_speed = 57600; | |
1555 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) | |
1556 | info->tty->alt_speed = 115200; | |
1557 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) | |
1558 | info->tty->alt_speed = 230400; | |
1559 | if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) | |
1560 | info->tty->alt_speed = 460800; | |
1561 | change_speed(info); | |
1562 | } | |
1563 | } else | |
1564 | retval = startup(info); | |
1565 | ||
1566 | return retval; | |
1567 | } | |
1568 | ||
1569 | static int set_esp_config(struct esp_struct * info, | |
1570 | struct hayes_esp_config __user * new_info) | |
1571 | { | |
1572 | struct hayes_esp_config new_config; | |
1573 | unsigned int change_dma; | |
1574 | int retval = 0; | |
1575 | struct esp_struct *current_async; | |
1576 | unsigned long flags; | |
1577 | ||
1578 | /* Perhaps a non-sysadmin user should be able to do some of these */ | |
1579 | /* operations. I haven't decided yet. */ | |
1580 | ||
1581 | if (!capable(CAP_SYS_ADMIN)) | |
1582 | return -EPERM; | |
1583 | ||
1584 | if (copy_from_user(&new_config, new_info, sizeof(new_config))) | |
1585 | return -EFAULT; | |
1586 | ||
1587 | if ((new_config.flow_on >= new_config.flow_off) || | |
1588 | (new_config.rx_trigger < 1) || | |
1589 | (new_config.tx_trigger < 1) || | |
1590 | (new_config.flow_off < 1) || | |
1591 | (new_config.flow_on < 1) || | |
1592 | (new_config.rx_trigger > 1023) || | |
1593 | (new_config.tx_trigger > 1023) || | |
1594 | (new_config.flow_off > 1023) || | |
1595 | (new_config.flow_on > 1023) || | |
1596 | (new_config.pio_threshold < 0) || | |
1597 | (new_config.pio_threshold > 1024)) | |
1598 | return -EINVAL; | |
1599 | ||
1600 | if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3)) | |
1601 | new_config.dma_channel = 0; | |
1602 | ||
1603 | if (info->stat_flags & ESP_STAT_NEVER_DMA) | |
1604 | change_dma = new_config.dma_channel; | |
1605 | else | |
1606 | change_dma = (new_config.dma_channel != dma); | |
1607 | ||
1608 | if (change_dma) { | |
1609 | if (new_config.dma_channel) { | |
1610 | /* PIO mode to DMA mode transition OR */ | |
1611 | /* change current DMA channel */ | |
1612 | ||
1613 | current_async = ports; | |
1614 | ||
1615 | while (current_async) { | |
1616 | if (current_async == info) { | |
1617 | if (current_async->count > 1) | |
1618 | return -EBUSY; | |
1619 | } else if (current_async->count) | |
1620 | return -EBUSY; | |
1621 | ||
1622 | current_async = | |
1623 | current_async->next_port; | |
1624 | } | |
1625 | ||
1626 | shutdown(info); | |
1627 | dma = new_config.dma_channel; | |
1628 | info->stat_flags &= ~ESP_STAT_NEVER_DMA; | |
1629 | ||
1630 | /* all ports must use the same DMA channel */ | |
1631 | ||
1632 | spin_lock_irqsave(&info->lock, flags); | |
1633 | current_async = ports; | |
1634 | ||
1635 | while (current_async) { | |
1636 | esp_basic_init(current_async); | |
1637 | current_async = current_async->next_port; | |
1638 | } | |
1639 | spin_unlock_irqrestore(&info->lock, flags); | |
1640 | } else { | |
1641 | /* DMA mode to PIO mode only */ | |
1642 | ||
1643 | if (info->count > 1) | |
1644 | return -EBUSY; | |
1645 | ||
1646 | shutdown(info); | |
1647 | spin_lock_irqsave(&info->lock, flags); | |
1648 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
1649 | esp_basic_init(info); | |
1650 | spin_unlock_irqrestore(&info->lock, flags); | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | info->config.pio_threshold = new_config.pio_threshold; | |
1655 | ||
1656 | if ((new_config.flow_off != info->config.flow_off) || | |
1657 | (new_config.flow_on != info->config.flow_on)) { | |
1658 | unsigned long flags; | |
1659 | ||
1660 | info->config.flow_off = new_config.flow_off; | |
1661 | info->config.flow_on = new_config.flow_on; | |
1662 | ||
1663 | spin_lock_irqsave(&info->lock, flags); | |
1664 | serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); | |
1665 | serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8); | |
1666 | serial_out(info, UART_ESI_CMD2, new_config.flow_off); | |
1667 | serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8); | |
1668 | serial_out(info, UART_ESI_CMD2, new_config.flow_on); | |
1669 | spin_unlock_irqrestore(&info->lock, flags); | |
1670 | } | |
1671 | ||
1672 | if ((new_config.rx_trigger != info->config.rx_trigger) || | |
1673 | (new_config.tx_trigger != info->config.tx_trigger)) { | |
1674 | unsigned long flags; | |
1675 | ||
1676 | info->config.rx_trigger = new_config.rx_trigger; | |
1677 | info->config.tx_trigger = new_config.tx_trigger; | |
1678 | spin_lock_irqsave(&info->lock, flags); | |
1679 | serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); | |
1680 | serial_out(info, UART_ESI_CMD2, | |
1681 | new_config.rx_trigger >> 8); | |
1682 | serial_out(info, UART_ESI_CMD2, new_config.rx_trigger); | |
1683 | serial_out(info, UART_ESI_CMD2, | |
1684 | new_config.tx_trigger >> 8); | |
1685 | serial_out(info, UART_ESI_CMD2, new_config.tx_trigger); | |
1686 | spin_unlock_irqrestore(&info->lock, flags); | |
1687 | } | |
1688 | ||
1689 | if (new_config.rx_timeout != info->config.rx_timeout) { | |
1690 | unsigned long flags; | |
1691 | ||
1692 | info->config.rx_timeout = new_config.rx_timeout; | |
1693 | spin_lock_irqsave(&info->lock, flags); | |
1694 | ||
1695 | if (info->IER & UART_IER_RDI) { | |
1696 | serial_out(info, UART_ESI_CMD1, | |
1697 | ESI_SET_RX_TIMEOUT); | |
1698 | serial_out(info, UART_ESI_CMD2, | |
1699 | new_config.rx_timeout); | |
1700 | } | |
1701 | ||
1702 | spin_unlock_irqrestore(&info->lock, flags); | |
1703 | } | |
1704 | ||
1705 | if (!(info->flags & ASYNC_INITIALIZED)) | |
1706 | retval = startup(info); | |
1707 | ||
1708 | return retval; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * get_lsr_info - get line status register info | |
1713 | * | |
1714 | * Purpose: Let user call ioctl() to get info when the UART physically | |
1715 | * is emptied. On bus types like RS485, the transmitter must | |
1716 | * release the bus after transmitting. This must be done when | |
1717 | * the transmit shift register is empty, not be done when the | |
1718 | * transmit holding register is empty. This functionality | |
1719 | * allows an RS485 driver to be written in user space. | |
1720 | */ | |
1721 | static int get_lsr_info(struct esp_struct * info, unsigned int __user *value) | |
1722 | { | |
1723 | unsigned char status; | |
1724 | unsigned int result; | |
1725 | unsigned long flags; | |
1726 | ||
1727 | spin_lock_irqsave(&info->lock, flags); | |
1728 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
1729 | status = serial_in(info, UART_ESI_STAT1); | |
1730 | spin_unlock_irqrestore(&info->lock, flags); | |
1731 | result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); | |
1732 | return put_user(result,value); | |
1733 | } | |
1734 | ||
1735 | ||
1736 | static int esp_tiocmget(struct tty_struct *tty, struct file *file) | |
1737 | { | |
1738 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1739 | unsigned char control, status; | |
1740 | unsigned long flags; | |
1741 | ||
1742 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1743 | return -ENODEV; | |
1744 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1745 | return -EIO; | |
1746 | ||
1747 | control = info->MCR; | |
1748 | ||
1749 | spin_lock_irqsave(&info->lock, flags); | |
1750 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
1751 | status = serial_in(info, UART_ESI_STAT2); | |
1752 | spin_unlock_irqrestore(&info->lock, flags); | |
1753 | ||
1754 | return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) | |
1755 | | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) | |
1756 | | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) | |
1757 | | ((status & UART_MSR_RI) ? TIOCM_RNG : 0) | |
1758 | | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) | |
1759 | | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0); | |
1760 | } | |
1761 | ||
1762 | static int esp_tiocmset(struct tty_struct *tty, struct file *file, | |
1763 | unsigned int set, unsigned int clear) | |
1764 | { | |
1765 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1766 | unsigned long flags; | |
1767 | ||
1768 | if (serial_paranoia_check(info, tty->name, __FUNCTION__)) | |
1769 | return -ENODEV; | |
1770 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1771 | return -EIO; | |
1772 | ||
1773 | spin_lock_irqsave(&info->lock, flags); | |
1774 | ||
1775 | if (set & TIOCM_RTS) | |
1776 | info->MCR |= UART_MCR_RTS; | |
1777 | if (set & TIOCM_DTR) | |
1778 | info->MCR |= UART_MCR_DTR; | |
1779 | ||
1780 | if (clear & TIOCM_RTS) | |
1781 | info->MCR &= ~UART_MCR_RTS; | |
1782 | if (clear & TIOCM_DTR) | |
1783 | info->MCR &= ~UART_MCR_DTR; | |
1784 | ||
1785 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1786 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1787 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1788 | ||
1789 | spin_unlock_irqrestore(&info->lock, flags); | |
1790 | return 0; | |
1791 | } | |
1792 | ||
1793 | /* | |
1794 | * rs_break() --- routine which turns the break handling on or off | |
1795 | */ | |
1796 | static void esp_break(struct tty_struct *tty, int break_state) | |
1797 | { | |
1798 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1799 | unsigned long flags; | |
1800 | ||
1801 | if (serial_paranoia_check(info, tty->name, "esp_break")) | |
1802 | return; | |
1803 | ||
1804 | if (break_state == -1) { | |
1805 | spin_lock_irqsave(&info->lock, flags); | |
1806 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); | |
1807 | serial_out(info, UART_ESI_CMD2, 0x01); | |
1808 | spin_unlock_irqrestore(&info->lock, flags); | |
1809 | ||
1810 | /* FIXME - new style wait needed here */ | |
1811 | interruptible_sleep_on(&info->break_wait); | |
1812 | } else { | |
1813 | spin_lock_irqsave(&info->lock, flags); | |
1814 | serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); | |
1815 | serial_out(info, UART_ESI_CMD2, 0x00); | |
1816 | spin_unlock_irqrestore(&info->lock, flags); | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1821 | unsigned int cmd, unsigned long arg) | |
1822 | { | |
1823 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1824 | struct async_icount cprev, cnow; /* kernel counter temps */ | |
1825 | struct serial_icounter_struct __user *p_cuser; /* user space */ | |
1826 | void __user *argp = (void __user *)arg; | |
1827 | unsigned long flags; | |
1828 | ||
1829 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1830 | return -ENODEV; | |
1831 | ||
1832 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1833 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1834 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) && | |
1835 | (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) && | |
1836 | (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) { | |
1837 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1838 | return -EIO; | |
1839 | } | |
1840 | ||
1841 | switch (cmd) { | |
1842 | case TIOCGSERIAL: | |
1843 | return get_serial_info(info, argp); | |
1844 | case TIOCSSERIAL: | |
1845 | return set_serial_info(info, argp); | |
1846 | case TIOCSERCONFIG: | |
1847 | /* do not reconfigure after initial configuration */ | |
1848 | return 0; | |
1849 | ||
1850 | case TIOCSERGWILD: | |
1851 | return put_user(0L, (unsigned long __user *)argp); | |
1852 | ||
1853 | case TIOCSERGETLSR: /* Get line status register */ | |
1854 | return get_lsr_info(info, argp); | |
1855 | ||
1856 | case TIOCSERSWILD: | |
1857 | if (!capable(CAP_SYS_ADMIN)) | |
1858 | return -EPERM; | |
1859 | return 0; | |
1860 | ||
1861 | /* | |
1862 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change | |
1863 | * - mask passed in arg for lines of interest | |
1864 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) | |
1865 | * Caller should use TIOCGICOUNT to see which one it was | |
1866 | */ | |
1867 | case TIOCMIWAIT: | |
1868 | spin_lock_irqsave(&info->lock, flags); | |
1869 | cprev = info->icount; /* note the counters on entry */ | |
1870 | spin_unlock_irqrestore(&info->lock, flags); | |
1871 | while (1) { | |
1872 | /* FIXME: convert to new style wakeup */ | |
1873 | interruptible_sleep_on(&info->delta_msr_wait); | |
1874 | /* see if a signal did it */ | |
1875 | if (signal_pending(current)) | |
1876 | return -ERESTARTSYS; | |
1877 | spin_lock_irqsave(&info->lock, flags); | |
1878 | cnow = info->icount; /* atomic copy */ | |
1879 | spin_unlock_irqrestore(&info->lock, flags); | |
1880 | if (cnow.rng == cprev.rng && | |
1881 | cnow.dsr == cprev.dsr && | |
1882 | cnow.dcd == cprev.dcd && | |
1883 | cnow.cts == cprev.cts) | |
1884 | return -EIO; /* no change => error */ | |
1885 | if (((arg & TIOCM_RNG) && | |
1886 | (cnow.rng != cprev.rng)) || | |
1887 | ((arg & TIOCM_DSR) && | |
1888 | (cnow.dsr != cprev.dsr)) || | |
1889 | ((arg & TIOCM_CD) && | |
1890 | (cnow.dcd != cprev.dcd)) || | |
1891 | ((arg & TIOCM_CTS) && | |
1892 | (cnow.cts != cprev.cts)) ) { | |
1893 | return 0; | |
1894 | } | |
1895 | cprev = cnow; | |
1896 | } | |
1897 | /* NOTREACHED */ | |
1898 | ||
1899 | /* | |
1900 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) | |
1901 | * Return: write counters to the user passed counter struct | |
1902 | * NB: both 1->0 and 0->1 transitions are counted except for | |
1903 | * RI where only 0->1 is counted. | |
1904 | */ | |
1905 | case TIOCGICOUNT: | |
1906 | spin_lock_irqsave(&info->lock, flags); | |
1907 | cnow = info->icount; | |
1908 | spin_unlock_irqrestore(&info->lock, flags); | |
1909 | p_cuser = argp; | |
1910 | if (put_user(cnow.cts, &p_cuser->cts) || | |
1911 | put_user(cnow.dsr, &p_cuser->dsr) || | |
1912 | put_user(cnow.rng, &p_cuser->rng) || | |
1913 | put_user(cnow.dcd, &p_cuser->dcd)) | |
1914 | return -EFAULT; | |
1915 | ||
1916 | return 0; | |
1917 | case TIOCGHAYESESP: | |
1918 | return get_esp_config(info, argp); | |
1919 | case TIOCSHAYESESP: | |
1920 | return set_esp_config(info, argp); | |
1921 | ||
1922 | default: | |
1923 | return -ENOIOCTLCMD; | |
1924 | } | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1929 | { | |
1930 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
1931 | unsigned long flags; | |
1932 | ||
1933 | if ( (tty->termios->c_cflag == old_termios->c_cflag) | |
1934 | && ( RELEVANT_IFLAG(tty->termios->c_iflag) | |
1935 | == RELEVANT_IFLAG(old_termios->c_iflag))) | |
1936 | return; | |
1937 | ||
1938 | change_speed(info); | |
1939 | ||
1940 | spin_lock_irqsave(&info->lock, flags); | |
1941 | ||
1942 | /* Handle transition to B0 status */ | |
1943 | if ((old_termios->c_cflag & CBAUD) && | |
1944 | !(tty->termios->c_cflag & CBAUD)) { | |
1945 | info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); | |
1946 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1947 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1948 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1949 | } | |
1950 | ||
1951 | /* Handle transition away from B0 status */ | |
1952 | if (!(old_termios->c_cflag & CBAUD) && | |
1953 | (tty->termios->c_cflag & CBAUD)) { | |
1954 | info->MCR |= (UART_MCR_DTR | UART_MCR_RTS); | |
1955 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
1956 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
1957 | serial_out(info, UART_ESI_CMD2, info->MCR); | |
1958 | } | |
1959 | ||
1960 | spin_unlock_irqrestore(&info->lock, flags); | |
1961 | ||
1962 | /* Handle turning of CRTSCTS */ | |
1963 | if ((old_termios->c_cflag & CRTSCTS) && | |
1964 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1965 | rs_start(tty); | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * ------------------------------------------------------------ | |
1971 | * rs_close() | |
1972 | * | |
1973 | * This routine is called when the serial port gets closed. First, we | |
1974 | * wait for the last remaining data to be sent. Then, we unlink its | |
1975 | * async structure from the interrupt chain if necessary, and we free | |
1976 | * that IRQ if nothing is left in the chain. | |
1977 | * ------------------------------------------------------------ | |
1978 | */ | |
1979 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1980 | { | |
1981 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
1982 | unsigned long flags; | |
1983 | ||
1984 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1985 | return; | |
1986 | ||
1987 | spin_lock_irqsave(&info->lock, flags); | |
1988 | ||
1989 | if (tty_hung_up_p(filp)) { | |
1990 | DBG_CNT("before DEC-hung"); | |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | #ifdef SERIAL_DEBUG_OPEN | |
1995 | printk("rs_close ttys%d, count = %d\n", info->line, info->count); | |
1996 | #endif | |
1997 | if ((tty->count == 1) && (info->count != 1)) { | |
1998 | /* | |
1999 | * Uh, oh. tty->count is 1, which means that the tty | |
2000 | * structure will be freed. Info->count should always | |
2001 | * be one in these conditions. If it's greater than | |
2002 | * one, we've got real problems, since it means the | |
2003 | * serial port won't be shutdown. | |
2004 | */ | |
2005 | printk("rs_close: bad serial port count; tty->count is 1, " | |
2006 | "info->count is %d\n", info->count); | |
2007 | info->count = 1; | |
2008 | } | |
2009 | if (--info->count < 0) { | |
2010 | printk("rs_close: bad serial port count for ttys%d: %d\n", | |
2011 | info->line, info->count); | |
2012 | info->count = 0; | |
2013 | } | |
2014 | if (info->count) { | |
2015 | DBG_CNT("before DEC-2"); | |
2016 | goto out; | |
2017 | } | |
2018 | info->flags |= ASYNC_CLOSING; | |
2019 | ||
2020 | spin_unlock_irqrestore(&info->lock, flags); | |
2021 | /* | |
2022 | * Now we wait for the transmit buffer to clear; and we notify | |
2023 | * the line discipline to only process XON/XOFF characters. | |
2024 | */ | |
2025 | tty->closing = 1; | |
2026 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
2027 | tty_wait_until_sent(tty, info->closing_wait); | |
2028 | /* | |
2029 | * At this point we stop accepting input. To do this, we | |
2030 | * disable the receive line status interrupts, and tell the | |
2031 | * interrupt driver to stop checking the data ready bit in the | |
2032 | * line status register. | |
2033 | */ | |
2034 | /* info->IER &= ~UART_IER_RLSI; */ | |
2035 | info->IER &= ~UART_IER_RDI; | |
2036 | info->read_status_mask &= ~UART_LSR_DR; | |
2037 | if (info->flags & ASYNC_INITIALIZED) { | |
2038 | ||
2039 | spin_lock_irqsave(&info->lock, flags); | |
2040 | serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); | |
2041 | serial_out(info, UART_ESI_CMD2, info->IER); | |
2042 | ||
2043 | /* disable receive timeout */ | |
2044 | serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); | |
2045 | serial_out(info, UART_ESI_CMD2, 0x00); | |
2046 | ||
2047 | spin_unlock_irqrestore(&info->lock, flags); | |
2048 | ||
2049 | /* | |
2050 | * Before we drop DTR, make sure the UART transmitter | |
2051 | * has completely drained; this is especially | |
2052 | * important if there is a transmit FIFO! | |
2053 | */ | |
2054 | rs_wait_until_sent(tty, info->timeout); | |
2055 | } | |
2056 | shutdown(info); | |
2057 | if (tty->driver->flush_buffer) | |
2058 | tty->driver->flush_buffer(tty); | |
2059 | tty_ldisc_flush(tty); | |
2060 | tty->closing = 0; | |
2061 | info->event = 0; | |
2062 | info->tty = NULL; | |
2063 | ||
2064 | if (info->blocked_open) { | |
2065 | if (info->close_delay) { | |
2066 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
2067 | } | |
2068 | wake_up_interruptible(&info->open_wait); | |
2069 | } | |
2070 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
2071 | wake_up_interruptible(&info->close_wait); | |
2072 | return; | |
2073 | ||
2074 | out: | |
2075 | spin_unlock_irqrestore(&info->lock, flags); | |
2076 | } | |
2077 | ||
2078 | static void rs_wait_until_sent(struct tty_struct *tty, int timeout) | |
2079 | { | |
2080 | struct esp_struct *info = (struct esp_struct *)tty->driver_data; | |
2081 | unsigned long orig_jiffies, char_time; | |
2082 | unsigned long flags; | |
2083 | ||
2084 | if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) | |
2085 | return; | |
2086 | ||
2087 | orig_jiffies = jiffies; | |
2088 | char_time = ((info->timeout - HZ / 50) / 1024) / 5; | |
2089 | ||
2090 | if (!char_time) | |
2091 | char_time = 1; | |
2092 | ||
2093 | spin_lock_irqsave(&info->lock, flags); | |
2094 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
2095 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
2096 | ||
2097 | while ((serial_in(info, UART_ESI_STAT1) != 0x03) || | |
2098 | (serial_in(info, UART_ESI_STAT2) != 0xff)) { | |
2099 | ||
2100 | spin_unlock_irqrestore(&info->lock, flags); | |
2101 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
2102 | ||
2103 | if (signal_pending(current)) | |
2104 | break; | |
2105 | ||
2106 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
2107 | break; | |
2108 | ||
2109 | spin_lock_irqsave(&info->lock, flags); | |
2110 | serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); | |
2111 | serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); | |
2112 | } | |
2113 | spin_unlock_irqrestore(&info->lock, flags); | |
2114 | set_current_state(TASK_RUNNING); | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * esp_hangup() --- called by tty_hangup() when a hangup is signaled. | |
2119 | */ | |
2120 | static void esp_hangup(struct tty_struct *tty) | |
2121 | { | |
2122 | struct esp_struct * info = (struct esp_struct *)tty->driver_data; | |
2123 | ||
2124 | if (serial_paranoia_check(info, tty->name, "esp_hangup")) | |
2125 | return; | |
2126 | ||
2127 | rs_flush_buffer(tty); | |
2128 | shutdown(info); | |
2129 | info->event = 0; | |
2130 | info->count = 0; | |
2131 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
2132 | info->tty = NULL; | |
2133 | wake_up_interruptible(&info->open_wait); | |
2134 | } | |
2135 | ||
2136 | /* | |
2137 | * ------------------------------------------------------------ | |
2138 | * esp_open() and friends | |
2139 | * ------------------------------------------------------------ | |
2140 | */ | |
2141 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
2142 | struct esp_struct *info) | |
2143 | { | |
2144 | DECLARE_WAITQUEUE(wait, current); | |
2145 | int retval; | |
2146 | int do_clocal = 0; | |
2147 | unsigned long flags; | |
2148 | ||
2149 | /* | |
2150 | * If the device is in the middle of being closed, then block | |
2151 | * until it's done, and then try again. | |
2152 | */ | |
2153 | if (tty_hung_up_p(filp) || | |
2154 | (info->flags & ASYNC_CLOSING)) { | |
2155 | if (info->flags & ASYNC_CLOSING) | |
2156 | interruptible_sleep_on(&info->close_wait); | |
2157 | #ifdef SERIAL_DO_RESTART | |
2158 | if (info->flags & ASYNC_HUP_NOTIFY) | |
2159 | return -EAGAIN; | |
2160 | else | |
2161 | return -ERESTARTSYS; | |
2162 | #else | |
2163 | return -EAGAIN; | |
2164 | #endif | |
2165 | } | |
2166 | ||
2167 | /* | |
2168 | * If non-blocking mode is set, or the port is not enabled, | |
2169 | * then make the check up front and then exit. | |
2170 | */ | |
2171 | if ((filp->f_flags & O_NONBLOCK) || | |
2172 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
2173 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | if (tty->termios->c_cflag & CLOCAL) | |
2178 | do_clocal = 1; | |
2179 | ||
2180 | /* | |
2181 | * Block waiting for the carrier detect and the line to become | |
2182 | * free (i.e., not in use by the callout). While we are in | |
2183 | * this loop, info->count is dropped by one, so that | |
2184 | * rs_close() knows when to free things. We restore it upon | |
2185 | * exit, either normal or abnormal. | |
2186 | */ | |
2187 | retval = 0; | |
2188 | add_wait_queue(&info->open_wait, &wait); | |
2189 | #ifdef SERIAL_DEBUG_OPEN | |
2190 | printk("block_til_ready before block: ttys%d, count = %d\n", | |
2191 | info->line, info->count); | |
2192 | #endif | |
2193 | spin_lock_irqsave(&info->lock, flags); | |
2194 | if (!tty_hung_up_p(filp)) | |
2195 | info->count--; | |
2196 | info->blocked_open++; | |
2197 | while (1) { | |
2198 | if ((tty->termios->c_cflag & CBAUD)) { | |
2199 | unsigned int scratch; | |
2200 | ||
2201 | serial_out(info, UART_ESI_CMD1, ESI_READ_UART); | |
2202 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2203 | scratch = serial_in(info, UART_ESI_STAT1); | |
2204 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
2205 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2206 | serial_out(info, UART_ESI_CMD2, | |
2207 | scratch | UART_MCR_DTR | UART_MCR_RTS); | |
2208 | } | |
2209 | set_current_state(TASK_INTERRUPTIBLE); | |
2210 | if (tty_hung_up_p(filp) || | |
2211 | !(info->flags & ASYNC_INITIALIZED)) { | |
2212 | #ifdef SERIAL_DO_RESTART | |
2213 | if (info->flags & ASYNC_HUP_NOTIFY) | |
2214 | retval = -EAGAIN; | |
2215 | else | |
2216 | retval = -ERESTARTSYS; | |
2217 | #else | |
2218 | retval = -EAGAIN; | |
2219 | #endif | |
2220 | break; | |
2221 | } | |
2222 | ||
2223 | serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); | |
2224 | if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD) | |
2225 | do_clocal = 1; | |
2226 | ||
2227 | if (!(info->flags & ASYNC_CLOSING) && | |
2228 | (do_clocal)) | |
2229 | break; | |
2230 | if (signal_pending(current)) { | |
2231 | retval = -ERESTARTSYS; | |
2232 | break; | |
2233 | } | |
2234 | #ifdef SERIAL_DEBUG_OPEN | |
2235 | printk("block_til_ready blocking: ttys%d, count = %d\n", | |
2236 | info->line, info->count); | |
2237 | #endif | |
2238 | spin_unlock_irqrestore(&info->lock, flags); | |
2239 | schedule(); | |
2240 | spin_lock_irqsave(&info->lock, flags); | |
2241 | } | |
2242 | set_current_state(TASK_RUNNING); | |
2243 | remove_wait_queue(&info->open_wait, &wait); | |
2244 | if (!tty_hung_up_p(filp)) | |
2245 | info->count++; | |
2246 | info->blocked_open--; | |
2247 | spin_unlock_irqrestore(&info->lock, flags); | |
2248 | #ifdef SERIAL_DEBUG_OPEN | |
2249 | printk("block_til_ready after blocking: ttys%d, count = %d\n", | |
2250 | info->line, info->count); | |
2251 | #endif | |
2252 | if (retval) | |
2253 | return retval; | |
2254 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * This routine is called whenever a serial port is opened. It | |
2260 | * enables interrupts for a serial port, linking in its async structure into | |
2261 | * the IRQ chain. It also performs the serial-specific | |
2262 | * initialization for the tty structure. | |
2263 | */ | |
2264 | static int esp_open(struct tty_struct *tty, struct file * filp) | |
2265 | { | |
2266 | struct esp_struct *info; | |
2267 | int retval, line; | |
2268 | unsigned long flags; | |
2269 | ||
2270 | line = tty->index; | |
2271 | if ((line < 0) || (line >= NR_PORTS)) | |
2272 | return -ENODEV; | |
2273 | ||
2274 | /* find the port in the chain */ | |
2275 | ||
2276 | info = ports; | |
2277 | ||
2278 | while (info && (info->line != line)) | |
2279 | info = info->next_port; | |
2280 | ||
2281 | if (!info) { | |
2282 | serial_paranoia_check(info, tty->name, "esp_open"); | |
2283 | return -ENODEV; | |
2284 | } | |
2285 | ||
2286 | #ifdef SERIAL_DEBUG_OPEN | |
2287 | printk("esp_open %s, count = %d\n", tty->name, info->count); | |
2288 | #endif | |
2289 | spin_lock_irqsave(&info->lock, flags); | |
2290 | info->count++; | |
2291 | tty->driver_data = info; | |
2292 | info->tty = tty; | |
2293 | ||
2294 | if (!tmp_buf) { | |
2295 | tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL); | |
2296 | if (!tmp_buf) | |
2297 | return -ENOMEM; | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * Start up serial port | |
2302 | */ | |
2303 | retval = startup(info); | |
2304 | if (retval) | |
2305 | return retval; | |
2306 | ||
2307 | retval = block_til_ready(tty, filp, info); | |
2308 | if (retval) { | |
2309 | #ifdef SERIAL_DEBUG_OPEN | |
2310 | printk("esp_open returning after block_til_ready with %d\n", | |
2311 | retval); | |
2312 | #endif | |
2313 | return retval; | |
2314 | } | |
2315 | ||
2316 | #ifdef SERIAL_DEBUG_OPEN | |
2317 | printk("esp_open %s successful...", tty->name); | |
2318 | #endif | |
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | /* | |
2323 | * --------------------------------------------------------------------- | |
2324 | * espserial_init() and friends | |
2325 | * | |
2326 | * espserial_init() is called at boot-time to initialize the serial driver. | |
2327 | * --------------------------------------------------------------------- | |
2328 | */ | |
2329 | ||
2330 | /* | |
2331 | * This routine prints out the appropriate serial driver version | |
2332 | * number, and identifies which options were configured into this | |
2333 | * driver. | |
2334 | */ | |
2335 | ||
2336 | static inline void show_serial_version(void) | |
2337 | { | |
2338 | printk(KERN_INFO "%s version %s (DMA %u)\n", | |
2339 | serial_name, serial_version, dma); | |
2340 | } | |
2341 | ||
2342 | /* | |
2343 | * This routine is called by espserial_init() to initialize a specific serial | |
2344 | * port. | |
2345 | */ | |
2346 | static inline int autoconfig(struct esp_struct * info) | |
2347 | { | |
2348 | int port_detected = 0; | |
2349 | unsigned long flags; | |
2350 | ||
2351 | if (!request_region(info->port, REGION_SIZE, "esp serial")) | |
2352 | return -EIO; | |
2353 | ||
2354 | spin_lock_irqsave(&info->lock, flags); | |
2355 | /* | |
2356 | * Check for ESP card | |
2357 | */ | |
2358 | ||
2359 | if (serial_in(info, UART_ESI_BASE) == 0xf3) { | |
2360 | serial_out(info, UART_ESI_CMD1, 0x00); | |
2361 | serial_out(info, UART_ESI_CMD1, 0x01); | |
2362 | ||
2363 | if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) { | |
2364 | port_detected = 1; | |
2365 | ||
2366 | if (!(info->irq)) { | |
2367 | serial_out(info, UART_ESI_CMD1, 0x02); | |
2368 | ||
2369 | if (serial_in(info, UART_ESI_STAT1) & 0x01) | |
2370 | info->irq = 3; | |
2371 | else | |
2372 | info->irq = 4; | |
2373 | } | |
2374 | ||
2375 | ||
2376 | /* put card in enhanced mode */ | |
2377 | /* this prevents access through */ | |
2378 | /* the "old" IO ports */ | |
2379 | esp_basic_init(info); | |
2380 | ||
2381 | /* clear out MCR */ | |
2382 | serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); | |
2383 | serial_out(info, UART_ESI_CMD2, UART_MCR); | |
2384 | serial_out(info, UART_ESI_CMD2, 0x00); | |
2385 | } | |
2386 | } | |
2387 | if (!port_detected) | |
2388 | release_region(info->port, REGION_SIZE); | |
2389 | ||
2390 | spin_unlock_irqrestore(&info->lock, flags); | |
2391 | return (port_detected); | |
2392 | } | |
2393 | ||
2394 | static struct tty_operations esp_ops = { | |
2395 | .open = esp_open, | |
2396 | .close = rs_close, | |
2397 | .write = rs_write, | |
2398 | .put_char = rs_put_char, | |
2399 | .flush_chars = rs_flush_chars, | |
2400 | .write_room = rs_write_room, | |
2401 | .chars_in_buffer = rs_chars_in_buffer, | |
2402 | .flush_buffer = rs_flush_buffer, | |
2403 | .ioctl = rs_ioctl, | |
2404 | .throttle = rs_throttle, | |
2405 | .unthrottle = rs_unthrottle, | |
2406 | .set_termios = rs_set_termios, | |
2407 | .stop = rs_stop, | |
2408 | .start = rs_start, | |
2409 | .hangup = esp_hangup, | |
2410 | .break_ctl = esp_break, | |
2411 | .wait_until_sent = rs_wait_until_sent, | |
2412 | .tiocmget = esp_tiocmget, | |
2413 | .tiocmset = esp_tiocmset, | |
2414 | }; | |
2415 | ||
2416 | /* | |
2417 | * The serial driver boot-time initialization code! | |
2418 | */ | |
2419 | static int __init espserial_init(void) | |
2420 | { | |
2421 | int i, offset; | |
2422 | struct esp_struct * info; | |
2423 | struct esp_struct *last_primary = NULL; | |
2424 | int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380}; | |
2425 | ||
2426 | esp_driver = alloc_tty_driver(NR_PORTS); | |
2427 | if (!esp_driver) | |
2428 | return -ENOMEM; | |
2429 | ||
2430 | for (i = 0; i < NR_PRIMARY; i++) { | |
2431 | if (irq[i] != 0) { | |
2432 | if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) || | |
2433 | (irq[i] == 8) || (irq[i] == 13)) | |
2434 | irq[i] = 0; | |
2435 | else if (irq[i] == 2) | |
2436 | irq[i] = 9; | |
2437 | } | |
2438 | } | |
2439 | ||
2440 | if ((dma != 1) && (dma != 3)) | |
2441 | dma = 0; | |
2442 | ||
2443 | if ((rx_trigger < 1) || (rx_trigger > 1023)) | |
2444 | rx_trigger = 768; | |
2445 | ||
2446 | if ((tx_trigger < 1) || (tx_trigger > 1023)) | |
2447 | tx_trigger = 768; | |
2448 | ||
2449 | if ((flow_off < 1) || (flow_off > 1023)) | |
2450 | flow_off = 1016; | |
2451 | ||
2452 | if ((flow_on < 1) || (flow_on > 1023)) | |
2453 | flow_on = 944; | |
2454 | ||
2455 | if ((rx_timeout < 0) || (rx_timeout > 255)) | |
2456 | rx_timeout = 128; | |
2457 | ||
2458 | if (flow_on >= flow_off) | |
2459 | flow_on = flow_off - 1; | |
2460 | ||
2461 | show_serial_version(); | |
2462 | ||
2463 | /* Initialize the tty_driver structure */ | |
2464 | ||
2465 | esp_driver->owner = THIS_MODULE; | |
2466 | esp_driver->name = "ttyP"; | |
2467 | esp_driver->devfs_name = "tts/P"; | |
2468 | esp_driver->major = ESP_IN_MAJOR; | |
2469 | esp_driver->minor_start = 0; | |
2470 | esp_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
2471 | esp_driver->subtype = SERIAL_TYPE_NORMAL; | |
2472 | esp_driver->init_termios = tty_std_termios; | |
2473 | esp_driver->init_termios.c_cflag = | |
2474 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
2475 | esp_driver->flags = TTY_DRIVER_REAL_RAW; | |
2476 | tty_set_operations(esp_driver, &esp_ops); | |
2477 | if (tty_register_driver(esp_driver)) | |
2478 | { | |
2479 | printk(KERN_ERR "Couldn't register esp serial driver"); | |
2480 | put_tty_driver(esp_driver); | |
2481 | return 1; | |
2482 | } | |
2483 | ||
2484 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); | |
2485 | ||
2486 | if (!info) | |
2487 | { | |
2488 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); | |
2489 | tty_unregister_driver(esp_driver); | |
2490 | put_tty_driver(esp_driver); | |
2491 | return 1; | |
2492 | } | |
2493 | ||
2494 | memset((void *)info, 0, sizeof(struct esp_struct)); | |
8f56a31a | 2495 | spin_lock_init(&info->lock); |
1da177e4 LT |
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); | |
1da177e4 LT |
2532 | ports = info; |
2533 | printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ", | |
2534 | info->line, info->port, info->irq); | |
2535 | ||
2536 | if (info->line % 8) { | |
2537 | printk("secondary port\n"); | |
2538 | /* 8 port cards can't do DMA */ | |
2539 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
2540 | ||
2541 | if (last_primary) | |
2542 | last_primary->stat_flags |= ESP_STAT_NEVER_DMA; | |
2543 | } else { | |
2544 | printk("primary port\n"); | |
2545 | last_primary = info; | |
2546 | irq[i] = info->irq; | |
2547 | } | |
2548 | ||
2549 | if (!dma) | |
2550 | info->stat_flags |= ESP_STAT_NEVER_DMA; | |
2551 | ||
2552 | info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL); | |
2553 | if (!info) | |
2554 | { | |
2555 | printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); | |
2556 | ||
2557 | /* allow use of the already detected ports */ | |
2558 | return 0; | |
2559 | } | |
2560 | ||
2561 | memset((void *)info, 0, sizeof(struct esp_struct)); | |
2562 | /* rx_trigger, tx_trigger are needed by autoconfig */ | |
2563 | info->config.rx_trigger = rx_trigger; | |
2564 | info->config.tx_trigger = tx_trigger; | |
2565 | ||
2566 | if (offset == 56) { | |
2567 | i++; | |
2568 | offset = 0; | |
2569 | } else { | |
2570 | offset += 8; | |
2571 | } | |
2572 | } while (i < NR_PRIMARY); | |
2573 | ||
2574 | /* free the last port memory allocation */ | |
2575 | kfree(info); | |
2576 | ||
2577 | return 0; | |
2578 | } | |
2579 | ||
2580 | static void __exit espserial_exit(void) | |
2581 | { | |
2582 | int e1; | |
2583 | struct esp_struct *temp_async; | |
2584 | struct esp_pio_buffer *pio_buf; | |
2585 | ||
2586 | /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ | |
2587 | if ((e1 = tty_unregister_driver(esp_driver))) | |
2588 | printk("SERIAL: failed to unregister serial driver (%d)\n", | |
2589 | e1); | |
2590 | put_tty_driver(esp_driver); | |
2591 | ||
2592 | while (ports) { | |
2593 | if (ports->port) { | |
2594 | release_region(ports->port, REGION_SIZE); | |
2595 | } | |
2596 | temp_async = ports->next_port; | |
2597 | kfree(ports); | |
2598 | ports = temp_async; | |
2599 | } | |
2600 | ||
2601 | if (dma_buffer) | |
2602 | free_pages((unsigned long)dma_buffer, | |
2603 | get_order(DMA_BUFFER_SZ)); | |
2604 | ||
2605 | if (tmp_buf) | |
2606 | free_page((unsigned long)tmp_buf); | |
2607 | ||
2608 | while (free_pio_buf) { | |
2609 | pio_buf = free_pio_buf->next; | |
2610 | kfree(free_pio_buf); | |
2611 | free_pio_buf = pio_buf; | |
2612 | } | |
2613 | } | |
2614 | ||
2615 | module_init(espserial_init); | |
2616 | module_exit(espserial_exit); |