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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; | |
7831d56b AC |
433 | |
434 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
7831d56b AC |
435 | |
436 | cflag = termios->c_cflag; | |
437 | param_new = 0; | |
438 | param_mask = 0; | |
439 | ||
eab4f5af | 440 | baud = tty_termios_baud_rate(termios); |
7831d56b AC |
441 | param_new = s->conf & MAX3100_BAUD; |
442 | switch (baud) { | |
443 | case 300: | |
444 | if (s->crystal) | |
445 | baud = s->baud; | |
446 | else | |
447 | param_new = 15; | |
448 | break; | |
449 | case 600: | |
450 | param_new = 14 + s->crystal; | |
451 | break; | |
452 | case 1200: | |
453 | param_new = 13 + s->crystal; | |
454 | break; | |
455 | case 2400: | |
456 | param_new = 12 + s->crystal; | |
457 | break; | |
458 | case 4800: | |
459 | param_new = 11 + s->crystal; | |
460 | break; | |
461 | case 9600: | |
462 | param_new = 10 + s->crystal; | |
463 | break; | |
464 | case 19200: | |
465 | param_new = 9 + s->crystal; | |
466 | break; | |
467 | case 38400: | |
468 | param_new = 8 + s->crystal; | |
469 | break; | |
470 | case 57600: | |
471 | param_new = 1 + s->crystal; | |
472 | break; | |
473 | case 115200: | |
474 | param_new = 0 + s->crystal; | |
475 | break; | |
476 | case 230400: | |
477 | if (s->crystal) | |
478 | param_new = 0; | |
479 | else | |
480 | baud = s->baud; | |
481 | break; | |
482 | default: | |
483 | baud = s->baud; | |
484 | } | |
eab4f5af | 485 | tty_termios_encode_baud_rate(termios, baud, baud); |
7831d56b AC |
486 | s->baud = baud; |
487 | param_mask |= MAX3100_BAUD; | |
488 | ||
489 | if ((cflag & CSIZE) == CS8) { | |
490 | param_new &= ~MAX3100_L; | |
491 | parity &= ~MAX3100_7BIT; | |
492 | } else { | |
493 | param_new |= MAX3100_L; | |
494 | parity |= MAX3100_7BIT; | |
495 | cflag = (cflag & ~CSIZE) | CS7; | |
496 | } | |
497 | param_mask |= MAX3100_L; | |
498 | ||
499 | if (cflag & CSTOPB) | |
500 | param_new |= MAX3100_ST; | |
501 | else | |
502 | param_new &= ~MAX3100_ST; | |
503 | param_mask |= MAX3100_ST; | |
504 | ||
505 | if (cflag & PARENB) { | |
506 | param_new |= MAX3100_PE; | |
507 | parity |= MAX3100_PARITY_ON; | |
508 | } else { | |
509 | param_new &= ~MAX3100_PE; | |
510 | parity &= ~MAX3100_PARITY_ON; | |
511 | } | |
512 | param_mask |= MAX3100_PE; | |
513 | ||
514 | if (cflag & PARODD) | |
515 | parity |= MAX3100_PARITY_ODD; | |
516 | else | |
517 | parity &= ~MAX3100_PARITY_ODD; | |
518 | ||
519 | /* mask termios capabilities we don't support */ | |
520 | cflag &= ~CMSPAR; | |
521 | termios->c_cflag = cflag; | |
522 | ||
523 | s->port.ignore_status_mask = 0; | |
524 | if (termios->c_iflag & IGNPAR) | |
525 | s->port.ignore_status_mask |= | |
526 | MAX3100_STATUS_PE | MAX3100_STATUS_FE | | |
527 | MAX3100_STATUS_OE; | |
528 | ||
529 | /* we are sending char from a workqueue so enable */ | |
ebd2c8f6 | 530 | s->port.state->port.tty->low_latency = 1; |
7831d56b AC |
531 | |
532 | if (s->poll_time > 0) | |
533 | del_timer_sync(&s->timer); | |
534 | ||
535 | uart_update_timeout(port, termios->c_cflag, baud); | |
536 | ||
537 | spin_lock(&s->conf_lock); | |
538 | s->conf = (s->conf & ~param_mask) | (param_new & param_mask); | |
539 | s->conf_commit = 1; | |
540 | s->parity = parity; | |
541 | spin_unlock(&s->conf_lock); | |
542 | max3100_dowork(s); | |
543 | ||
544 | if (UART_ENABLE_MS(&s->port, termios->c_cflag)) | |
545 | max3100_enable_ms(&s->port); | |
546 | } | |
547 | ||
548 | static void max3100_shutdown(struct uart_port *port) | |
549 | { | |
550 | struct max3100_port *s = container_of(port, | |
551 | struct max3100_port, | |
552 | port); | |
553 | ||
554 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
555 | ||
556 | if (s->suspending) | |
557 | return; | |
558 | ||
559 | s->force_end_work = 1; | |
560 | ||
561 | if (s->poll_time > 0) | |
562 | del_timer_sync(&s->timer); | |
563 | ||
564 | if (s->workqueue) { | |
565 | flush_workqueue(s->workqueue); | |
566 | destroy_workqueue(s->workqueue); | |
567 | s->workqueue = NULL; | |
568 | } | |
569 | if (s->irq) | |
570 | free_irq(s->irq, s); | |
571 | ||
572 | /* set shutdown mode to save power */ | |
573 | if (s->max3100_hw_suspend) | |
574 | s->max3100_hw_suspend(1); | |
575 | else { | |
576 | u16 tx, rx; | |
577 | ||
578 | tx = MAX3100_WC | MAX3100_SHDN; | |
579 | max3100_sr(s, tx, &rx); | |
580 | } | |
581 | } | |
582 | ||
583 | static int max3100_startup(struct uart_port *port) | |
584 | { | |
585 | struct max3100_port *s = container_of(port, | |
586 | struct max3100_port, | |
587 | port); | |
588 | char b[12]; | |
589 | ||
590 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
591 | ||
592 | s->conf = MAX3100_RM; | |
593 | s->baud = s->crystal ? 230400 : 115200; | |
594 | s->rx_enabled = 1; | |
595 | ||
596 | if (s->suspending) | |
597 | return 0; | |
598 | ||
599 | s->force_end_work = 0; | |
600 | s->parity = 0; | |
601 | s->rts = 0; | |
602 | ||
603 | sprintf(b, "max3100-%d", s->minor); | |
604 | s->workqueue = create_freezeable_workqueue(b); | |
605 | if (!s->workqueue) { | |
606 | dev_warn(&s->spi->dev, "cannot create workqueue\n"); | |
607 | return -EBUSY; | |
608 | } | |
609 | INIT_WORK(&s->work, max3100_work); | |
610 | ||
611 | if (request_irq(s->irq, max3100_irq, | |
612 | IRQF_TRIGGER_FALLING, "max3100", s) < 0) { | |
613 | dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); | |
614 | s->irq = 0; | |
615 | destroy_workqueue(s->workqueue); | |
616 | s->workqueue = NULL; | |
617 | return -EBUSY; | |
618 | } | |
619 | ||
620 | if (s->loopback) { | |
621 | u16 tx, rx; | |
622 | tx = 0x4001; | |
623 | max3100_sr(s, tx, &rx); | |
624 | } | |
625 | ||
626 | if (s->max3100_hw_suspend) | |
627 | s->max3100_hw_suspend(0); | |
628 | s->conf_commit = 1; | |
629 | max3100_dowork(s); | |
630 | /* wait for clock to settle */ | |
631 | msleep(50); | |
632 | ||
633 | max3100_enable_ms(&s->port); | |
634 | ||
635 | return 0; | |
636 | } | |
637 | ||
638 | static const char *max3100_type(struct uart_port *port) | |
639 | { | |
640 | struct max3100_port *s = container_of(port, | |
641 | struct max3100_port, | |
642 | port); | |
643 | ||
644 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
645 | ||
646 | return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; | |
647 | } | |
648 | ||
649 | static void max3100_release_port(struct uart_port *port) | |
650 | { | |
651 | struct max3100_port *s = container_of(port, | |
652 | struct max3100_port, | |
653 | port); | |
654 | ||
655 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
656 | } | |
657 | ||
658 | static void max3100_config_port(struct uart_port *port, int flags) | |
659 | { | |
660 | struct max3100_port *s = container_of(port, | |
661 | struct max3100_port, | |
662 | port); | |
663 | ||
664 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
665 | ||
666 | if (flags & UART_CONFIG_TYPE) | |
667 | s->port.type = PORT_MAX3100; | |
668 | } | |
669 | ||
670 | static int max3100_verify_port(struct uart_port *port, | |
671 | struct serial_struct *ser) | |
672 | { | |
673 | struct max3100_port *s = container_of(port, | |
674 | struct max3100_port, | |
675 | port); | |
676 | int ret = -EINVAL; | |
677 | ||
678 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
679 | ||
680 | if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) | |
681 | ret = 0; | |
682 | return ret; | |
683 | } | |
684 | ||
685 | static void max3100_stop_tx(struct uart_port *port) | |
686 | { | |
687 | struct max3100_port *s = container_of(port, | |
688 | struct max3100_port, | |
689 | port); | |
690 | ||
691 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
692 | } | |
693 | ||
694 | static int max3100_request_port(struct uart_port *port) | |
695 | { | |
696 | struct max3100_port *s = container_of(port, | |
697 | struct max3100_port, | |
698 | port); | |
699 | ||
700 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static void max3100_break_ctl(struct uart_port *port, int break_state) | |
705 | { | |
706 | struct max3100_port *s = container_of(port, | |
707 | struct max3100_port, | |
708 | port); | |
709 | ||
710 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
711 | } | |
712 | ||
713 | static struct uart_ops max3100_ops = { | |
714 | .tx_empty = max3100_tx_empty, | |
715 | .set_mctrl = max3100_set_mctrl, | |
716 | .get_mctrl = max3100_get_mctrl, | |
717 | .stop_tx = max3100_stop_tx, | |
718 | .start_tx = max3100_start_tx, | |
719 | .stop_rx = max3100_stop_rx, | |
720 | .enable_ms = max3100_enable_ms, | |
721 | .break_ctl = max3100_break_ctl, | |
722 | .startup = max3100_startup, | |
723 | .shutdown = max3100_shutdown, | |
724 | .set_termios = max3100_set_termios, | |
725 | .type = max3100_type, | |
726 | .release_port = max3100_release_port, | |
727 | .request_port = max3100_request_port, | |
728 | .config_port = max3100_config_port, | |
729 | .verify_port = max3100_verify_port, | |
730 | }; | |
731 | ||
732 | static struct uart_driver max3100_uart_driver = { | |
733 | .owner = THIS_MODULE, | |
734 | .driver_name = "ttyMAX", | |
735 | .dev_name = "ttyMAX", | |
736 | .major = MAX3100_MAJOR, | |
737 | .minor = MAX3100_MINOR, | |
738 | .nr = MAX_MAX3100, | |
739 | }; | |
740 | static int uart_driver_registered; | |
741 | ||
742 | static int __devinit max3100_probe(struct spi_device *spi) | |
743 | { | |
744 | int i, retval; | |
745 | struct plat_max3100 *pdata; | |
746 | u16 tx, rx; | |
747 | ||
748 | mutex_lock(&max3100s_lock); | |
749 | ||
750 | if (!uart_driver_registered) { | |
751 | uart_driver_registered = 1; | |
752 | retval = uart_register_driver(&max3100_uart_driver); | |
753 | if (retval) { | |
754 | printk(KERN_ERR "Couldn't register max3100 uart driver\n"); | |
755 | mutex_unlock(&max3100s_lock); | |
756 | return retval; | |
757 | } | |
758 | } | |
759 | ||
760 | for (i = 0; i < MAX_MAX3100; i++) | |
761 | if (!max3100s[i]) | |
762 | break; | |
763 | if (i == MAX_MAX3100) { | |
764 | dev_warn(&spi->dev, "too many MAX3100 chips\n"); | |
765 | mutex_unlock(&max3100s_lock); | |
766 | return -ENOMEM; | |
767 | } | |
768 | ||
769 | max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); | |
770 | if (!max3100s[i]) { | |
771 | dev_warn(&spi->dev, | |
772 | "kmalloc for max3100 structure %d failed!\n", i); | |
773 | mutex_unlock(&max3100s_lock); | |
774 | return -ENOMEM; | |
775 | } | |
776 | max3100s[i]->spi = spi; | |
777 | max3100s[i]->irq = spi->irq; | |
778 | spin_lock_init(&max3100s[i]->conf_lock); | |
779 | dev_set_drvdata(&spi->dev, max3100s[i]); | |
780 | pdata = spi->dev.platform_data; | |
781 | max3100s[i]->crystal = pdata->crystal; | |
782 | max3100s[i]->loopback = pdata->loopback; | |
783 | max3100s[i]->poll_time = pdata->poll_time * HZ / 1000; | |
784 | if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) | |
785 | max3100s[i]->poll_time = 1; | |
786 | max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; | |
787 | max3100s[i]->minor = i; | |
788 | init_timer(&max3100s[i]->timer); | |
789 | max3100s[i]->timer.function = max3100_timeout; | |
790 | max3100s[i]->timer.data = (unsigned long) max3100s[i]; | |
791 | ||
792 | dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); | |
793 | max3100s[i]->port.irq = max3100s[i]->irq; | |
794 | max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; | |
795 | max3100s[i]->port.fifosize = 16; | |
796 | max3100s[i]->port.ops = &max3100_ops; | |
797 | max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; | |
798 | max3100s[i]->port.line = i; | |
799 | max3100s[i]->port.type = PORT_MAX3100; | |
800 | max3100s[i]->port.dev = &spi->dev; | |
801 | retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
802 | if (retval < 0) | |
803 | dev_warn(&spi->dev, | |
804 | "uart_add_one_port failed for line %d with error %d\n", | |
805 | i, retval); | |
806 | ||
807 | /* set shutdown mode to save power. Will be woken-up on open */ | |
808 | if (max3100s[i]->max3100_hw_suspend) | |
809 | max3100s[i]->max3100_hw_suspend(1); | |
810 | else { | |
811 | tx = MAX3100_WC | MAX3100_SHDN; | |
812 | max3100_sr(max3100s[i], tx, &rx); | |
813 | } | |
814 | mutex_unlock(&max3100s_lock); | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static int __devexit max3100_remove(struct spi_device *spi) | |
819 | { | |
820 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
821 | int i; | |
822 | ||
823 | mutex_lock(&max3100s_lock); | |
824 | ||
825 | /* find out the index for the chip we are removing */ | |
826 | for (i = 0; i < MAX_MAX3100; i++) | |
827 | if (max3100s[i] == s) | |
828 | break; | |
829 | ||
830 | dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); | |
831 | uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
832 | kfree(max3100s[i]); | |
833 | max3100s[i] = NULL; | |
834 | ||
835 | /* check if this is the last chip we have */ | |
836 | for (i = 0; i < MAX_MAX3100; i++) | |
837 | if (max3100s[i]) { | |
838 | mutex_unlock(&max3100s_lock); | |
839 | return 0; | |
840 | } | |
841 | pr_debug("removing max3100 driver\n"); | |
842 | uart_unregister_driver(&max3100_uart_driver); | |
843 | ||
844 | mutex_unlock(&max3100s_lock); | |
845 | return 0; | |
846 | } | |
847 | ||
848 | #ifdef CONFIG_PM | |
849 | ||
850 | static int max3100_suspend(struct spi_device *spi, pm_message_t state) | |
851 | { | |
852 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
853 | ||
854 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
855 | ||
856 | disable_irq(s->irq); | |
857 | ||
858 | s->suspending = 1; | |
859 | uart_suspend_port(&max3100_uart_driver, &s->port); | |
860 | ||
861 | if (s->max3100_hw_suspend) | |
862 | s->max3100_hw_suspend(1); | |
863 | else { | |
864 | /* no HW suspend, so do SW one */ | |
865 | u16 tx, rx; | |
866 | ||
867 | tx = MAX3100_WC | MAX3100_SHDN; | |
868 | max3100_sr(s, tx, &rx); | |
869 | } | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static int max3100_resume(struct spi_device *spi) | |
874 | { | |
875 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
876 | ||
877 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
878 | ||
879 | if (s->max3100_hw_suspend) | |
880 | s->max3100_hw_suspend(0); | |
881 | uart_resume_port(&max3100_uart_driver, &s->port); | |
882 | s->suspending = 0; | |
883 | ||
884 | enable_irq(s->irq); | |
885 | ||
886 | s->conf_commit = 1; | |
887 | if (s->workqueue) | |
888 | max3100_dowork(s); | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | #else | |
894 | #define max3100_suspend NULL | |
895 | #define max3100_resume NULL | |
896 | #endif | |
897 | ||
898 | static struct spi_driver max3100_driver = { | |
899 | .driver = { | |
900 | .name = "max3100", | |
901 | .bus = &spi_bus_type, | |
902 | .owner = THIS_MODULE, | |
903 | }, | |
904 | ||
905 | .probe = max3100_probe, | |
906 | .remove = __devexit_p(max3100_remove), | |
907 | .suspend = max3100_suspend, | |
908 | .resume = max3100_resume, | |
909 | }; | |
910 | ||
911 | static int __init max3100_init(void) | |
912 | { | |
913 | return spi_register_driver(&max3100_driver); | |
914 | } | |
915 | module_init(max3100_init); | |
916 | ||
917 | static void __exit max3100_exit(void) | |
918 | { | |
919 | spi_unregister_driver(&max3100_driver); | |
920 | } | |
921 | module_exit(max3100_exit); | |
922 | ||
923 | MODULE_DESCRIPTION("MAX3100 driver"); | |
924 | MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); | |
925 | MODULE_LICENSE("GPL"); | |
e0626e38 | 926 | MODULE_ALIAS("spi:max3100"); |