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7831d56b AC |
1 | /* |
2 | * | |
3 | * Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * | |
11 | * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have | |
12 | * to use polling for flow control. TX empty IRQ is unusable, since | |
13 | * writing conf clears FIFO buffer and we cannot have this interrupt | |
14 | * always asking us for attention. | |
15 | * | |
16 | * Example platform data: | |
17 | ||
18 | static struct plat_max3100 max3100_plat_data = { | |
19 | .loopback = 0, | |
20 | .crystal = 0, | |
21 | .poll_time = 100, | |
22 | }; | |
23 | ||
24 | static struct spi_board_info spi_board_info[] = { | |
25 | { | |
26 | .modalias = "max3100", | |
27 | .platform_data = &max3100_plat_data, | |
28 | .irq = IRQ_EINT12, | |
29 | .max_speed_hz = 5*1000*1000, | |
30 | .chip_select = 0, | |
31 | }, | |
32 | }; | |
33 | ||
34 | * The initial minor number is 209 in the low-density serial port: | |
35 | * mknod /dev/ttyMAX0 c 204 209 | |
36 | */ | |
37 | ||
38 | #define MAX3100_MAJOR 204 | |
39 | #define MAX3100_MINOR 209 | |
40 | /* 4 MAX3100s should be enough for everyone */ | |
41 | #define MAX_MAX3100 4 | |
42 | ||
43 | #include <linux/delay.h> | |
5a0e3ad6 | 44 | #include <linux/slab.h> |
7831d56b AC |
45 | #include <linux/device.h> |
46 | #include <linux/serial_core.h> | |
47 | #include <linux/serial.h> | |
48 | #include <linux/spi/spi.h> | |
49 | #include <linux/freezer.h> | |
50 | ||
51 | #include <linux/serial_max3100.h> | |
52 | ||
53 | #define MAX3100_C (1<<14) | |
54 | #define MAX3100_D (0<<14) | |
55 | #define MAX3100_W (1<<15) | |
56 | #define MAX3100_RX (0<<15) | |
57 | ||
58 | #define MAX3100_WC (MAX3100_W | MAX3100_C) | |
59 | #define MAX3100_RC (MAX3100_RX | MAX3100_C) | |
60 | #define MAX3100_WD (MAX3100_W | MAX3100_D) | |
61 | #define MAX3100_RD (MAX3100_RX | MAX3100_D) | |
62 | #define MAX3100_CMD (3 << 14) | |
63 | ||
64 | #define MAX3100_T (1<<14) | |
65 | #define MAX3100_R (1<<15) | |
66 | ||
67 | #define MAX3100_FEN (1<<13) | |
68 | #define MAX3100_SHDN (1<<12) | |
69 | #define MAX3100_TM (1<<11) | |
70 | #define MAX3100_RM (1<<10) | |
71 | #define MAX3100_PM (1<<9) | |
72 | #define MAX3100_RAM (1<<8) | |
73 | #define MAX3100_IR (1<<7) | |
74 | #define MAX3100_ST (1<<6) | |
75 | #define MAX3100_PE (1<<5) | |
76 | #define MAX3100_L (1<<4) | |
77 | #define MAX3100_BAUD (0xf) | |
78 | ||
79 | #define MAX3100_TE (1<<10) | |
80 | #define MAX3100_RAFE (1<<10) | |
81 | #define MAX3100_RTS (1<<9) | |
82 | #define MAX3100_CTS (1<<9) | |
83 | #define MAX3100_PT (1<<8) | |
84 | #define MAX3100_DATA (0xff) | |
85 | ||
86 | #define MAX3100_RT (MAX3100_R | MAX3100_T) | |
87 | #define MAX3100_RTC (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE) | |
88 | ||
89 | /* the following simulate a status reg for ignore_status_mask */ | |
90 | #define MAX3100_STATUS_PE 1 | |
91 | #define MAX3100_STATUS_FE 2 | |
92 | #define MAX3100_STATUS_OE 4 | |
93 | ||
94 | struct max3100_port { | |
95 | struct uart_port port; | |
96 | struct spi_device *spi; | |
97 | ||
98 | int cts; /* last CTS received for flow ctrl */ | |
99 | int tx_empty; /* last TX empty bit */ | |
100 | ||
101 | spinlock_t conf_lock; /* shared data */ | |
102 | int conf_commit; /* need to make changes */ | |
103 | int conf; /* configuration for the MAX31000 | |
104 | * (bits 0-7, bits 8-11 are irqs) */ | |
105 | int rts_commit; /* need to change rts */ | |
106 | int rts; /* rts status */ | |
107 | int baud; /* current baud rate */ | |
108 | ||
109 | int parity; /* keeps track if we should send parity */ | |
110 | #define MAX3100_PARITY_ON 1 | |
111 | #define MAX3100_PARITY_ODD 2 | |
112 | #define MAX3100_7BIT 4 | |
113 | int rx_enabled; /* if we should rx chars */ | |
114 | ||
115 | int irq; /* irq assigned to the max3100 */ | |
116 | ||
117 | int minor; /* minor number */ | |
118 | int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */ | |
119 | int loopback; /* 1 if we are in loopback mode */ | |
120 | ||
121 | /* for handling irqs: need workqueue since we do spi_sync */ | |
122 | struct workqueue_struct *workqueue; | |
123 | struct work_struct work; | |
124 | /* set to 1 to make the workhandler exit as soon as possible */ | |
125 | int force_end_work; | |
126 | /* need to know we are suspending to avoid deadlock on workqueue */ | |
127 | int suspending; | |
128 | ||
129 | /* hook for suspending MAX3100 via dedicated pin */ | |
130 | void (*max3100_hw_suspend) (int suspend); | |
131 | ||
132 | /* poll time (in ms) for ctrl lines */ | |
133 | int poll_time; | |
134 | /* and its timer */ | |
135 | struct timer_list timer; | |
136 | }; | |
137 | ||
138 | static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ | |
139 | static DEFINE_MUTEX(max3100s_lock); /* race on probe */ | |
140 | ||
141 | static int max3100_do_parity(struct max3100_port *s, u16 c) | |
142 | { | |
143 | int parity; | |
144 | ||
145 | if (s->parity & MAX3100_PARITY_ODD) | |
146 | parity = 1; | |
147 | else | |
148 | parity = 0; | |
149 | ||
150 | if (s->parity & MAX3100_7BIT) | |
151 | c &= 0x7f; | |
152 | else | |
153 | c &= 0xff; | |
154 | ||
155 | parity = parity ^ (hweight8(c) & 1); | |
156 | return parity; | |
157 | } | |
158 | ||
159 | static int max3100_check_parity(struct max3100_port *s, u16 c) | |
160 | { | |
161 | return max3100_do_parity(s, c) == ((c >> 8) & 1); | |
162 | } | |
163 | ||
164 | static void max3100_calc_parity(struct max3100_port *s, u16 *c) | |
165 | { | |
166 | if (s->parity & MAX3100_7BIT) | |
167 | *c &= 0x7f; | |
168 | else | |
169 | *c &= 0xff; | |
170 | ||
171 | if (s->parity & MAX3100_PARITY_ON) | |
172 | *c |= max3100_do_parity(s, *c) << 8; | |
173 | } | |
174 | ||
175 | static void max3100_work(struct work_struct *w); | |
176 | ||
177 | static void max3100_dowork(struct max3100_port *s) | |
178 | { | |
179 | if (!s->force_end_work && !work_pending(&s->work) && | |
180 | !freezing(current) && !s->suspending) | |
181 | queue_work(s->workqueue, &s->work); | |
182 | } | |
183 | ||
184 | static void max3100_timeout(unsigned long data) | |
185 | { | |
186 | struct max3100_port *s = (struct max3100_port *)data; | |
187 | ||
ebd2c8f6 | 188 | if (s->port.state) { |
7831d56b AC |
189 | max3100_dowork(s); |
190 | mod_timer(&s->timer, jiffies + s->poll_time); | |
191 | } | |
192 | } | |
193 | ||
194 | static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) | |
195 | { | |
196 | struct spi_message message; | |
197 | u16 etx, erx; | |
198 | int status; | |
199 | struct spi_transfer tran = { | |
200 | .tx_buf = &etx, | |
201 | .rx_buf = &erx, | |
202 | .len = 2, | |
203 | }; | |
204 | ||
205 | etx = cpu_to_be16(tx); | |
206 | spi_message_init(&message); | |
207 | spi_message_add_tail(&tran, &message); | |
208 | status = spi_sync(s->spi, &message); | |
209 | if (status) { | |
210 | dev_warn(&s->spi->dev, "error while calling spi_sync\n"); | |
211 | return -EIO; | |
212 | } | |
213 | *rx = be16_to_cpu(erx); | |
214 | s->tx_empty = (*rx & MAX3100_T) > 0; | |
215 | dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int max3100_handlerx(struct max3100_port *s, u16 rx) | |
220 | { | |
221 | unsigned int ch, flg, status = 0; | |
222 | int ret = 0, cts; | |
223 | ||
224 | if (rx & MAX3100_R && s->rx_enabled) { | |
225 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
226 | ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff); | |
227 | if (rx & MAX3100_RAFE) { | |
228 | s->port.icount.frame++; | |
229 | flg = TTY_FRAME; | |
230 | status |= MAX3100_STATUS_FE; | |
231 | } else { | |
232 | if (s->parity & MAX3100_PARITY_ON) { | |
233 | if (max3100_check_parity(s, rx)) { | |
234 | s->port.icount.rx++; | |
235 | flg = TTY_NORMAL; | |
236 | } else { | |
237 | s->port.icount.parity++; | |
238 | flg = TTY_PARITY; | |
239 | status |= MAX3100_STATUS_PE; | |
240 | } | |
241 | } else { | |
242 | s->port.icount.rx++; | |
243 | flg = TTY_NORMAL; | |
244 | } | |
245 | } | |
246 | uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg); | |
247 | ret = 1; | |
248 | } | |
249 | ||
250 | cts = (rx & MAX3100_CTS) > 0; | |
251 | if (s->cts != cts) { | |
252 | s->cts = cts; | |
253 | uart_handle_cts_change(&s->port, cts ? TIOCM_CTS : 0); | |
254 | } | |
255 | ||
256 | return ret; | |
257 | } | |
258 | ||
259 | static void max3100_work(struct work_struct *w) | |
260 | { | |
261 | struct max3100_port *s = container_of(w, struct max3100_port, work); | |
262 | int rxchars; | |
263 | u16 tx, rx; | |
264 | int conf, cconf, rts, crts; | |
ebd2c8f6 | 265 | struct circ_buf *xmit = &s->port.state->xmit; |
7831d56b AC |
266 | |
267 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
268 | ||
269 | rxchars = 0; | |
270 | do { | |
271 | spin_lock(&s->conf_lock); | |
272 | conf = s->conf; | |
273 | cconf = s->conf_commit; | |
274 | s->conf_commit = 0; | |
275 | rts = s->rts; | |
276 | crts = s->rts_commit; | |
277 | s->rts_commit = 0; | |
278 | spin_unlock(&s->conf_lock); | |
279 | if (cconf) | |
280 | max3100_sr(s, MAX3100_WC | conf, &rx); | |
281 | if (crts) { | |
282 | max3100_sr(s, MAX3100_WD | MAX3100_TE | | |
283 | (s->rts ? MAX3100_RTS : 0), &rx); | |
284 | rxchars += max3100_handlerx(s, rx); | |
285 | } | |
286 | ||
287 | max3100_sr(s, MAX3100_RD, &rx); | |
288 | rxchars += max3100_handlerx(s, rx); | |
289 | ||
290 | if (rx & MAX3100_T) { | |
291 | tx = 0xffff; | |
292 | if (s->port.x_char) { | |
293 | tx = s->port.x_char; | |
294 | s->port.icount.tx++; | |
295 | s->port.x_char = 0; | |
296 | } else if (!uart_circ_empty(xmit) && | |
297 | !uart_tx_stopped(&s->port)) { | |
298 | tx = xmit->buf[xmit->tail]; | |
299 | xmit->tail = (xmit->tail + 1) & | |
300 | (UART_XMIT_SIZE - 1); | |
301 | s->port.icount.tx++; | |
302 | } | |
303 | if (tx != 0xffff) { | |
304 | max3100_calc_parity(s, &tx); | |
305 | tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); | |
306 | max3100_sr(s, tx, &rx); | |
307 | rxchars += max3100_handlerx(s, rx); | |
308 | } | |
309 | } | |
310 | ||
ebd2c8f6 AC |
311 | if (rxchars > 16 && s->port.state->port.tty != NULL) { |
312 | tty_flip_buffer_push(s->port.state->port.tty); | |
7831d56b AC |
313 | rxchars = 0; |
314 | } | |
315 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
316 | uart_write_wakeup(&s->port); | |
317 | ||
318 | } while (!s->force_end_work && | |
319 | !freezing(current) && | |
320 | ((rx & MAX3100_R) || | |
321 | (!uart_circ_empty(xmit) && | |
322 | !uart_tx_stopped(&s->port)))); | |
323 | ||
ebd2c8f6 AC |
324 | if (rxchars > 0 && s->port.state->port.tty != NULL) |
325 | tty_flip_buffer_push(s->port.state->port.tty); | |
7831d56b AC |
326 | } |
327 | ||
328 | static irqreturn_t max3100_irq(int irqno, void *dev_id) | |
329 | { | |
330 | struct max3100_port *s = dev_id; | |
331 | ||
332 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
333 | ||
334 | max3100_dowork(s); | |
335 | return IRQ_HANDLED; | |
336 | } | |
337 | ||
338 | static void max3100_enable_ms(struct uart_port *port) | |
339 | { | |
340 | struct max3100_port *s = container_of(port, | |
341 | struct max3100_port, | |
342 | port); | |
343 | ||
344 | if (s->poll_time > 0) | |
345 | mod_timer(&s->timer, jiffies); | |
346 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
347 | } | |
348 | ||
349 | static void max3100_start_tx(struct uart_port *port) | |
350 | { | |
351 | struct max3100_port *s = container_of(port, | |
352 | struct max3100_port, | |
353 | port); | |
354 | ||
355 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
356 | ||
357 | max3100_dowork(s); | |
358 | } | |
359 | ||
360 | static void max3100_stop_rx(struct uart_port *port) | |
361 | { | |
362 | struct max3100_port *s = container_of(port, | |
363 | struct max3100_port, | |
364 | port); | |
365 | ||
366 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
367 | ||
368 | s->rx_enabled = 0; | |
369 | spin_lock(&s->conf_lock); | |
370 | s->conf &= ~MAX3100_RM; | |
371 | s->conf_commit = 1; | |
372 | spin_unlock(&s->conf_lock); | |
373 | max3100_dowork(s); | |
374 | } | |
375 | ||
376 | static unsigned int max3100_tx_empty(struct uart_port *port) | |
377 | { | |
378 | struct max3100_port *s = container_of(port, | |
379 | struct max3100_port, | |
380 | port); | |
381 | ||
382 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
383 | ||
384 | /* may not be truly up-to-date */ | |
385 | max3100_dowork(s); | |
386 | return s->tx_empty; | |
387 | } | |
388 | ||
389 | static unsigned int max3100_get_mctrl(struct uart_port *port) | |
390 | { | |
391 | struct max3100_port *s = container_of(port, | |
392 | struct max3100_port, | |
393 | port); | |
394 | ||
395 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
396 | ||
397 | /* may not be truly up-to-date */ | |
398 | max3100_dowork(s); | |
399 | /* always assert DCD and DSR since these lines are not wired */ | |
400 | return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; | |
401 | } | |
402 | ||
403 | static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
404 | { | |
405 | struct max3100_port *s = container_of(port, | |
406 | struct max3100_port, | |
407 | port); | |
408 | int rts; | |
409 | ||
410 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
411 | ||
412 | rts = (mctrl & TIOCM_RTS) > 0; | |
413 | ||
414 | spin_lock(&s->conf_lock); | |
415 | if (s->rts != rts) { | |
416 | s->rts = rts; | |
417 | s->rts_commit = 1; | |
418 | max3100_dowork(s); | |
419 | } | |
420 | spin_unlock(&s->conf_lock); | |
421 | } | |
422 | ||
423 | static void | |
424 | max3100_set_termios(struct uart_port *port, struct ktermios *termios, | |
425 | struct ktermios *old) | |
426 | { | |
427 | struct max3100_port *s = container_of(port, | |
428 | struct max3100_port, | |
429 | port); | |
430 | int baud = 0; | |
431 | unsigned cflag; | |
432 | u32 param_new, param_mask, parity = 0; | |
ebd2c8f6 | 433 | struct tty_struct *tty = s->port.state->port.tty; |
7831d56b AC |
434 | |
435 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
436 | if (!tty) | |
437 | return; | |
438 | ||
439 | cflag = termios->c_cflag; | |
440 | param_new = 0; | |
441 | param_mask = 0; | |
442 | ||
443 | baud = tty_get_baud_rate(tty); | |
444 | param_new = s->conf & MAX3100_BAUD; | |
445 | switch (baud) { | |
446 | case 300: | |
447 | if (s->crystal) | |
448 | baud = s->baud; | |
449 | else | |
450 | param_new = 15; | |
451 | break; | |
452 | case 600: | |
453 | param_new = 14 + s->crystal; | |
454 | break; | |
455 | case 1200: | |
456 | param_new = 13 + s->crystal; | |
457 | break; | |
458 | case 2400: | |
459 | param_new = 12 + s->crystal; | |
460 | break; | |
461 | case 4800: | |
462 | param_new = 11 + s->crystal; | |
463 | break; | |
464 | case 9600: | |
465 | param_new = 10 + s->crystal; | |
466 | break; | |
467 | case 19200: | |
468 | param_new = 9 + s->crystal; | |
469 | break; | |
470 | case 38400: | |
471 | param_new = 8 + s->crystal; | |
472 | break; | |
473 | case 57600: | |
474 | param_new = 1 + s->crystal; | |
475 | break; | |
476 | case 115200: | |
477 | param_new = 0 + s->crystal; | |
478 | break; | |
479 | case 230400: | |
480 | if (s->crystal) | |
481 | param_new = 0; | |
482 | else | |
483 | baud = s->baud; | |
484 | break; | |
485 | default: | |
486 | baud = s->baud; | |
487 | } | |
488 | tty_encode_baud_rate(tty, baud, baud); | |
489 | s->baud = baud; | |
490 | param_mask |= MAX3100_BAUD; | |
491 | ||
492 | if ((cflag & CSIZE) == CS8) { | |
493 | param_new &= ~MAX3100_L; | |
494 | parity &= ~MAX3100_7BIT; | |
495 | } else { | |
496 | param_new |= MAX3100_L; | |
497 | parity |= MAX3100_7BIT; | |
498 | cflag = (cflag & ~CSIZE) | CS7; | |
499 | } | |
500 | param_mask |= MAX3100_L; | |
501 | ||
502 | if (cflag & CSTOPB) | |
503 | param_new |= MAX3100_ST; | |
504 | else | |
505 | param_new &= ~MAX3100_ST; | |
506 | param_mask |= MAX3100_ST; | |
507 | ||
508 | if (cflag & PARENB) { | |
509 | param_new |= MAX3100_PE; | |
510 | parity |= MAX3100_PARITY_ON; | |
511 | } else { | |
512 | param_new &= ~MAX3100_PE; | |
513 | parity &= ~MAX3100_PARITY_ON; | |
514 | } | |
515 | param_mask |= MAX3100_PE; | |
516 | ||
517 | if (cflag & PARODD) | |
518 | parity |= MAX3100_PARITY_ODD; | |
519 | else | |
520 | parity &= ~MAX3100_PARITY_ODD; | |
521 | ||
522 | /* mask termios capabilities we don't support */ | |
523 | cflag &= ~CMSPAR; | |
524 | termios->c_cflag = cflag; | |
525 | ||
526 | s->port.ignore_status_mask = 0; | |
527 | if (termios->c_iflag & IGNPAR) | |
528 | s->port.ignore_status_mask |= | |
529 | MAX3100_STATUS_PE | MAX3100_STATUS_FE | | |
530 | MAX3100_STATUS_OE; | |
531 | ||
532 | /* we are sending char from a workqueue so enable */ | |
ebd2c8f6 | 533 | s->port.state->port.tty->low_latency = 1; |
7831d56b AC |
534 | |
535 | if (s->poll_time > 0) | |
536 | del_timer_sync(&s->timer); | |
537 | ||
538 | uart_update_timeout(port, termios->c_cflag, baud); | |
539 | ||
540 | spin_lock(&s->conf_lock); | |
541 | s->conf = (s->conf & ~param_mask) | (param_new & param_mask); | |
542 | s->conf_commit = 1; | |
543 | s->parity = parity; | |
544 | spin_unlock(&s->conf_lock); | |
545 | max3100_dowork(s); | |
546 | ||
547 | if (UART_ENABLE_MS(&s->port, termios->c_cflag)) | |
548 | max3100_enable_ms(&s->port); | |
549 | } | |
550 | ||
551 | static void max3100_shutdown(struct uart_port *port) | |
552 | { | |
553 | struct max3100_port *s = container_of(port, | |
554 | struct max3100_port, | |
555 | port); | |
556 | ||
557 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
558 | ||
559 | if (s->suspending) | |
560 | return; | |
561 | ||
562 | s->force_end_work = 1; | |
563 | ||
564 | if (s->poll_time > 0) | |
565 | del_timer_sync(&s->timer); | |
566 | ||
567 | if (s->workqueue) { | |
568 | flush_workqueue(s->workqueue); | |
569 | destroy_workqueue(s->workqueue); | |
570 | s->workqueue = NULL; | |
571 | } | |
572 | if (s->irq) | |
573 | free_irq(s->irq, s); | |
574 | ||
575 | /* set shutdown mode to save power */ | |
576 | if (s->max3100_hw_suspend) | |
577 | s->max3100_hw_suspend(1); | |
578 | else { | |
579 | u16 tx, rx; | |
580 | ||
581 | tx = MAX3100_WC | MAX3100_SHDN; | |
582 | max3100_sr(s, tx, &rx); | |
583 | } | |
584 | } | |
585 | ||
586 | static int max3100_startup(struct uart_port *port) | |
587 | { | |
588 | struct max3100_port *s = container_of(port, | |
589 | struct max3100_port, | |
590 | port); | |
591 | char b[12]; | |
592 | ||
593 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
594 | ||
595 | s->conf = MAX3100_RM; | |
596 | s->baud = s->crystal ? 230400 : 115200; | |
597 | s->rx_enabled = 1; | |
598 | ||
599 | if (s->suspending) | |
600 | return 0; | |
601 | ||
602 | s->force_end_work = 0; | |
603 | s->parity = 0; | |
604 | s->rts = 0; | |
605 | ||
606 | sprintf(b, "max3100-%d", s->minor); | |
607 | s->workqueue = create_freezeable_workqueue(b); | |
608 | if (!s->workqueue) { | |
609 | dev_warn(&s->spi->dev, "cannot create workqueue\n"); | |
610 | return -EBUSY; | |
611 | } | |
612 | INIT_WORK(&s->work, max3100_work); | |
613 | ||
614 | if (request_irq(s->irq, max3100_irq, | |
615 | IRQF_TRIGGER_FALLING, "max3100", s) < 0) { | |
616 | dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); | |
617 | s->irq = 0; | |
618 | destroy_workqueue(s->workqueue); | |
619 | s->workqueue = NULL; | |
620 | return -EBUSY; | |
621 | } | |
622 | ||
623 | if (s->loopback) { | |
624 | u16 tx, rx; | |
625 | tx = 0x4001; | |
626 | max3100_sr(s, tx, &rx); | |
627 | } | |
628 | ||
629 | if (s->max3100_hw_suspend) | |
630 | s->max3100_hw_suspend(0); | |
631 | s->conf_commit = 1; | |
632 | max3100_dowork(s); | |
633 | /* wait for clock to settle */ | |
634 | msleep(50); | |
635 | ||
636 | max3100_enable_ms(&s->port); | |
637 | ||
638 | return 0; | |
639 | } | |
640 | ||
641 | static const char *max3100_type(struct uart_port *port) | |
642 | { | |
643 | struct max3100_port *s = container_of(port, | |
644 | struct max3100_port, | |
645 | port); | |
646 | ||
647 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
648 | ||
649 | return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; | |
650 | } | |
651 | ||
652 | static void max3100_release_port(struct uart_port *port) | |
653 | { | |
654 | struct max3100_port *s = container_of(port, | |
655 | struct max3100_port, | |
656 | port); | |
657 | ||
658 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
659 | } | |
660 | ||
661 | static void max3100_config_port(struct uart_port *port, int flags) | |
662 | { | |
663 | struct max3100_port *s = container_of(port, | |
664 | struct max3100_port, | |
665 | port); | |
666 | ||
667 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
668 | ||
669 | if (flags & UART_CONFIG_TYPE) | |
670 | s->port.type = PORT_MAX3100; | |
671 | } | |
672 | ||
673 | static int max3100_verify_port(struct uart_port *port, | |
674 | struct serial_struct *ser) | |
675 | { | |
676 | struct max3100_port *s = container_of(port, | |
677 | struct max3100_port, | |
678 | port); | |
679 | int ret = -EINVAL; | |
680 | ||
681 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
682 | ||
683 | if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) | |
684 | ret = 0; | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static void max3100_stop_tx(struct uart_port *port) | |
689 | { | |
690 | struct max3100_port *s = container_of(port, | |
691 | struct max3100_port, | |
692 | port); | |
693 | ||
694 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
695 | } | |
696 | ||
697 | static int max3100_request_port(struct uart_port *port) | |
698 | { | |
699 | struct max3100_port *s = container_of(port, | |
700 | struct max3100_port, | |
701 | port); | |
702 | ||
703 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static void max3100_break_ctl(struct uart_port *port, int break_state) | |
708 | { | |
709 | struct max3100_port *s = container_of(port, | |
710 | struct max3100_port, | |
711 | port); | |
712 | ||
713 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
714 | } | |
715 | ||
716 | static struct uart_ops max3100_ops = { | |
717 | .tx_empty = max3100_tx_empty, | |
718 | .set_mctrl = max3100_set_mctrl, | |
719 | .get_mctrl = max3100_get_mctrl, | |
720 | .stop_tx = max3100_stop_tx, | |
721 | .start_tx = max3100_start_tx, | |
722 | .stop_rx = max3100_stop_rx, | |
723 | .enable_ms = max3100_enable_ms, | |
724 | .break_ctl = max3100_break_ctl, | |
725 | .startup = max3100_startup, | |
726 | .shutdown = max3100_shutdown, | |
727 | .set_termios = max3100_set_termios, | |
728 | .type = max3100_type, | |
729 | .release_port = max3100_release_port, | |
730 | .request_port = max3100_request_port, | |
731 | .config_port = max3100_config_port, | |
732 | .verify_port = max3100_verify_port, | |
733 | }; | |
734 | ||
735 | static struct uart_driver max3100_uart_driver = { | |
736 | .owner = THIS_MODULE, | |
737 | .driver_name = "ttyMAX", | |
738 | .dev_name = "ttyMAX", | |
739 | .major = MAX3100_MAJOR, | |
740 | .minor = MAX3100_MINOR, | |
741 | .nr = MAX_MAX3100, | |
742 | }; | |
743 | static int uart_driver_registered; | |
744 | ||
745 | static int __devinit max3100_probe(struct spi_device *spi) | |
746 | { | |
747 | int i, retval; | |
748 | struct plat_max3100 *pdata; | |
749 | u16 tx, rx; | |
750 | ||
751 | mutex_lock(&max3100s_lock); | |
752 | ||
753 | if (!uart_driver_registered) { | |
754 | uart_driver_registered = 1; | |
755 | retval = uart_register_driver(&max3100_uart_driver); | |
756 | if (retval) { | |
757 | printk(KERN_ERR "Couldn't register max3100 uart driver\n"); | |
758 | mutex_unlock(&max3100s_lock); | |
759 | return retval; | |
760 | } | |
761 | } | |
762 | ||
763 | for (i = 0; i < MAX_MAX3100; i++) | |
764 | if (!max3100s[i]) | |
765 | break; | |
766 | if (i == MAX_MAX3100) { | |
767 | dev_warn(&spi->dev, "too many MAX3100 chips\n"); | |
768 | mutex_unlock(&max3100s_lock); | |
769 | return -ENOMEM; | |
770 | } | |
771 | ||
772 | max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); | |
773 | if (!max3100s[i]) { | |
774 | dev_warn(&spi->dev, | |
775 | "kmalloc for max3100 structure %d failed!\n", i); | |
776 | mutex_unlock(&max3100s_lock); | |
777 | return -ENOMEM; | |
778 | } | |
779 | max3100s[i]->spi = spi; | |
780 | max3100s[i]->irq = spi->irq; | |
781 | spin_lock_init(&max3100s[i]->conf_lock); | |
782 | dev_set_drvdata(&spi->dev, max3100s[i]); | |
783 | pdata = spi->dev.platform_data; | |
784 | max3100s[i]->crystal = pdata->crystal; | |
785 | max3100s[i]->loopback = pdata->loopback; | |
786 | max3100s[i]->poll_time = pdata->poll_time * HZ / 1000; | |
787 | if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) | |
788 | max3100s[i]->poll_time = 1; | |
789 | max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; | |
790 | max3100s[i]->minor = i; | |
791 | init_timer(&max3100s[i]->timer); | |
792 | max3100s[i]->timer.function = max3100_timeout; | |
793 | max3100s[i]->timer.data = (unsigned long) max3100s[i]; | |
794 | ||
795 | dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); | |
796 | max3100s[i]->port.irq = max3100s[i]->irq; | |
797 | max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; | |
798 | max3100s[i]->port.fifosize = 16; | |
799 | max3100s[i]->port.ops = &max3100_ops; | |
800 | max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; | |
801 | max3100s[i]->port.line = i; | |
802 | max3100s[i]->port.type = PORT_MAX3100; | |
803 | max3100s[i]->port.dev = &spi->dev; | |
804 | retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
805 | if (retval < 0) | |
806 | dev_warn(&spi->dev, | |
807 | "uart_add_one_port failed for line %d with error %d\n", | |
808 | i, retval); | |
809 | ||
810 | /* set shutdown mode to save power. Will be woken-up on open */ | |
811 | if (max3100s[i]->max3100_hw_suspend) | |
812 | max3100s[i]->max3100_hw_suspend(1); | |
813 | else { | |
814 | tx = MAX3100_WC | MAX3100_SHDN; | |
815 | max3100_sr(max3100s[i], tx, &rx); | |
816 | } | |
817 | mutex_unlock(&max3100s_lock); | |
818 | return 0; | |
819 | } | |
820 | ||
821 | static int __devexit max3100_remove(struct spi_device *spi) | |
822 | { | |
823 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
824 | int i; | |
825 | ||
826 | mutex_lock(&max3100s_lock); | |
827 | ||
828 | /* find out the index for the chip we are removing */ | |
829 | for (i = 0; i < MAX_MAX3100; i++) | |
830 | if (max3100s[i] == s) | |
831 | break; | |
832 | ||
833 | dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); | |
834 | uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
835 | kfree(max3100s[i]); | |
836 | max3100s[i] = NULL; | |
837 | ||
838 | /* check if this is the last chip we have */ | |
839 | for (i = 0; i < MAX_MAX3100; i++) | |
840 | if (max3100s[i]) { | |
841 | mutex_unlock(&max3100s_lock); | |
842 | return 0; | |
843 | } | |
844 | pr_debug("removing max3100 driver\n"); | |
845 | uart_unregister_driver(&max3100_uart_driver); | |
846 | ||
847 | mutex_unlock(&max3100s_lock); | |
848 | return 0; | |
849 | } | |
850 | ||
851 | #ifdef CONFIG_PM | |
852 | ||
853 | static int max3100_suspend(struct spi_device *spi, pm_message_t state) | |
854 | { | |
855 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
856 | ||
857 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
858 | ||
859 | disable_irq(s->irq); | |
860 | ||
861 | s->suspending = 1; | |
862 | uart_suspend_port(&max3100_uart_driver, &s->port); | |
863 | ||
864 | if (s->max3100_hw_suspend) | |
865 | s->max3100_hw_suspend(1); | |
866 | else { | |
867 | /* no HW suspend, so do SW one */ | |
868 | u16 tx, rx; | |
869 | ||
870 | tx = MAX3100_WC | MAX3100_SHDN; | |
871 | max3100_sr(s, tx, &rx); | |
872 | } | |
873 | return 0; | |
874 | } | |
875 | ||
876 | static int max3100_resume(struct spi_device *spi) | |
877 | { | |
878 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
879 | ||
880 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
881 | ||
882 | if (s->max3100_hw_suspend) | |
883 | s->max3100_hw_suspend(0); | |
884 | uart_resume_port(&max3100_uart_driver, &s->port); | |
885 | s->suspending = 0; | |
886 | ||
887 | enable_irq(s->irq); | |
888 | ||
889 | s->conf_commit = 1; | |
890 | if (s->workqueue) | |
891 | max3100_dowork(s); | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | #else | |
897 | #define max3100_suspend NULL | |
898 | #define max3100_resume NULL | |
899 | #endif | |
900 | ||
901 | static struct spi_driver max3100_driver = { | |
902 | .driver = { | |
903 | .name = "max3100", | |
904 | .bus = &spi_bus_type, | |
905 | .owner = THIS_MODULE, | |
906 | }, | |
907 | ||
908 | .probe = max3100_probe, | |
909 | .remove = __devexit_p(max3100_remove), | |
910 | .suspend = max3100_suspend, | |
911 | .resume = max3100_resume, | |
912 | }; | |
913 | ||
914 | static int __init max3100_init(void) | |
915 | { | |
916 | return spi_register_driver(&max3100_driver); | |
917 | } | |
918 | module_init(max3100_init); | |
919 | ||
920 | static void __exit max3100_exit(void) | |
921 | { | |
922 | spi_unregister_driver(&max3100_driver); | |
923 | } | |
924 | module_exit(max3100_exit); | |
925 | ||
926 | MODULE_DESCRIPTION("MAX3100 driver"); | |
927 | MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); | |
928 | MODULE_LICENSE("GPL"); | |
e0626e38 | 929 | MODULE_ALIAS("spi:max3100"); |