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Commit | Line | Data |
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22510995 | 1 | /* |
ee9b4500 | 2 | * mrst_max3110.c - spi uart protocol driver for Maxim 3110 |
22510995 | 3 | * |
ee9b4500 | 4 | * Copyright (c) 2008-2010, Intel Corporation. |
22510995 FT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Note: | |
22 | * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has | |
23 | * 1 word. If SPI master controller doesn't support sclk frequency change, | |
24 | * then the char need be sent out one by one with some delay | |
25 | * | |
26 | * 2. Currently only RX availabe interrrupt is used, no need for waiting TXE | |
27 | * interrupt for a low speed UART device | |
28 | */ | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/ioport.h> | |
c044391b | 32 | #include <linux/irq.h> |
22510995 FT |
33 | #include <linux/init.h> |
34 | #include <linux/console.h> | |
22510995 FT |
35 | #include <linux/tty.h> |
36 | #include <linux/tty_flip.h> | |
37 | #include <linux/serial_core.h> | |
38 | #include <linux/serial_reg.h> | |
39 | ||
40 | #include <linux/kthread.h> | |
22510995 | 41 | #include <linux/spi/spi.h> |
22510995 FT |
42 | |
43 | #include "mrst_max3110.h" | |
44 | ||
45 | #define PR_FMT "mrst_max3110: " | |
46 | ||
d6e679b4 AV |
47 | #define UART_TX_NEEDED 1 |
48 | #define CON_TX_NEEDED 2 | |
49 | #define BIT_IRQ_PENDING 3 | |
50 | ||
22510995 FT |
51 | struct uart_max3110 { |
52 | struct uart_port port; | |
53 | struct spi_device *spi; | |
ee9b4500 | 54 | char name[24]; |
22510995 FT |
55 | |
56 | wait_queue_head_t wq; | |
57 | struct task_struct *main_thread; | |
58 | struct task_struct *read_thread; | |
68c16b41 | 59 | struct mutex thread_mutex;; |
22510995 FT |
60 | |
61 | u32 baud; | |
62 | u16 cur_conf; | |
63 | u8 clock; | |
64 | u8 parity, word_7bits; | |
ee9b4500 | 65 | u16 irq; |
22510995 | 66 | |
d6e679b4 | 67 | unsigned long uart_flags; |
22510995 FT |
68 | |
69 | /* console related */ | |
70 | struct circ_buf con_xmit; | |
22510995 FT |
71 | }; |
72 | ||
73 | /* global data structure, may need be removed */ | |
ee9b4500 FT |
74 | static struct uart_max3110 *pmax; |
75 | ||
22510995 FT |
76 | static void receive_chars(struct uart_max3110 *max, |
77 | unsigned char *str, int len); | |
ee9b4500 FT |
78 | static int max3110_read_multi(struct uart_max3110 *max, u8 *buf); |
79 | static void max3110_con_receive(struct uart_max3110 *max); | |
22510995 | 80 | |
ee9b4500 FT |
81 | static int max3110_write_then_read(struct uart_max3110 *max, |
82 | const void *txbuf, void *rxbuf, unsigned len, int always_fast) | |
22510995 FT |
83 | { |
84 | struct spi_device *spi = max->spi; | |
85 | struct spi_message message; | |
86 | struct spi_transfer x; | |
87 | int ret; | |
88 | ||
22510995 FT |
89 | spi_message_init(&message); |
90 | memset(&x, 0, sizeof x); | |
91 | x.len = len; | |
92 | x.tx_buf = txbuf; | |
93 | x.rx_buf = rxbuf; | |
94 | spi_message_add_tail(&x, &message); | |
95 | ||
96 | if (always_fast) | |
ee9b4500 | 97 | x.speed_hz = spi->max_speed_hz; |
22510995 FT |
98 | else if (max->baud) |
99 | x.speed_hz = max->baud; | |
100 | ||
101 | /* Do the i/o */ | |
102 | ret = spi_sync(spi, &message); | |
103 | return ret; | |
104 | } | |
105 | ||
ee9b4500 FT |
106 | /* Write a 16b word to the device */ |
107 | static int max3110_out(struct uart_max3110 *max, const u16 out) | |
22510995 | 108 | { |
ee9b4500 FT |
109 | void *buf; |
110 | u16 *obuf, *ibuf; | |
111 | u8 ch; | |
22510995 FT |
112 | int ret; |
113 | ||
ee9b4500 FT |
114 | buf = kzalloc(8, GFP_KERNEL | GFP_DMA); |
115 | if (!buf) | |
116 | return -ENOMEM; | |
117 | ||
118 | obuf = buf; | |
119 | ibuf = buf + 4; | |
120 | *obuf = out; | |
121 | ret = max3110_write_then_read(max, obuf, ibuf, 2, 1); | |
122 | if (ret) { | |
123 | pr_warning(PR_FMT "%s(): get err msg %d when sending 0x%x\n", | |
124 | __func__, ret, out); | |
125 | goto exit; | |
126 | } | |
22510995 FT |
127 | |
128 | /* If some valid data is read back */ | |
ee9b4500 FT |
129 | if (*ibuf & MAX3110_READ_DATA_AVAILABLE) { |
130 | ch = *ibuf & 0xff; | |
131 | receive_chars(max, &ch, 1); | |
132 | } | |
22510995 | 133 | |
ee9b4500 FT |
134 | exit: |
135 | kfree(buf); | |
22510995 FT |
136 | return ret; |
137 | } | |
138 | ||
22510995 FT |
139 | /* |
140 | * This is usually used to read data from SPIC RX FIFO, which doesn't | |
ee9b4500 FT |
141 | * need any delay like flushing character out. |
142 | * | |
143 | * Return how many valide bytes are read back | |
22510995 | 144 | */ |
ee9b4500 | 145 | static int max3110_read_multi(struct uart_max3110 *max, u8 *rxbuf) |
22510995 | 146 | { |
ee9b4500 FT |
147 | void *buf; |
148 | u16 *obuf, *ibuf; | |
149 | u8 *pbuf, valid_str[M3110_RX_FIFO_DEPTH]; | |
150 | int i, j, blen; | |
22510995 | 151 | |
ee9b4500 FT |
152 | blen = M3110_RX_FIFO_DEPTH * sizeof(u16); |
153 | buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA); | |
154 | if (!buf) { | |
155 | pr_warning(PR_FMT "%s(): fail to alloc dma buffer\n", __func__); | |
22510995 FT |
156 | return 0; |
157 | } | |
158 | ||
ee9b4500 FT |
159 | /* tx/rx always have the same length */ |
160 | obuf = buf; | |
161 | ibuf = buf + blen; | |
22510995 | 162 | |
ee9b4500 FT |
163 | if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) { |
164 | kfree(buf); | |
22510995 | 165 | return 0; |
ee9b4500 | 166 | } |
22510995 | 167 | |
ee9b4500 FT |
168 | /* If caller doesn't provide a buffer, then handle received char */ |
169 | pbuf = rxbuf ? rxbuf : valid_str; | |
22510995 | 170 | |
ee9b4500 FT |
171 | for (i = 0, j = 0; i < M3110_RX_FIFO_DEPTH; i++) { |
172 | if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE) | |
173 | pbuf[j++] = ibuf[i] & 0xff; | |
22510995 FT |
174 | } |
175 | ||
176 | if (j && (pbuf == valid_str)) | |
177 | receive_chars(max, valid_str, j); | |
178 | ||
ee9b4500 | 179 | kfree(buf); |
22510995 FT |
180 | return j; |
181 | } | |
182 | ||
183 | static void serial_m3110_con_putchar(struct uart_port *port, int ch) | |
184 | { | |
185 | struct uart_max3110 *max = | |
186 | container_of(port, struct uart_max3110, port); | |
187 | struct circ_buf *xmit = &max->con_xmit; | |
188 | ||
189 | if (uart_circ_chars_free(xmit)) { | |
190 | xmit->buf[xmit->head] = (char)ch; | |
191 | xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1); | |
192 | } | |
22510995 FT |
193 | } |
194 | ||
195 | /* | |
196 | * Print a string to the serial port trying not to disturb | |
197 | * any possible real use of the port... | |
198 | * | |
199 | * The console_lock must be held when we get here. | |
200 | */ | |
201 | static void serial_m3110_con_write(struct console *co, | |
202 | const char *s, unsigned int count) | |
203 | { | |
204 | if (!pmax) | |
205 | return; | |
206 | ||
207 | uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar); | |
ee9b4500 FT |
208 | |
209 | if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags)) | |
210 | wake_up_process(pmax->main_thread); | |
22510995 FT |
211 | } |
212 | ||
213 | static int __init | |
214 | serial_m3110_con_setup(struct console *co, char *options) | |
215 | { | |
216 | struct uart_max3110 *max = pmax; | |
217 | int baud = 115200; | |
218 | int bits = 8; | |
219 | int parity = 'n'; | |
220 | int flow = 'n'; | |
221 | ||
222 | pr_info(PR_FMT "setting up console\n"); | |
223 | ||
ee9b4500 FT |
224 | if (co->index == -1) |
225 | co->index = 0; | |
226 | ||
22510995 FT |
227 | if (!max) { |
228 | pr_err(PR_FMT "pmax is NULL, return"); | |
229 | return -ENODEV; | |
230 | } | |
231 | ||
232 | if (options) | |
233 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
234 | ||
235 | return uart_set_options(&max->port, co, baud, parity, bits, flow); | |
236 | } | |
237 | ||
238 | static struct tty_driver *serial_m3110_con_device(struct console *co, | |
239 | int *index) | |
240 | { | |
241 | struct uart_driver *p = co->data; | |
242 | *index = co->index; | |
243 | return p->tty_driver; | |
244 | } | |
245 | ||
246 | static struct uart_driver serial_m3110_reg; | |
247 | static struct console serial_m3110_console = { | |
248 | .name = "ttyS", | |
249 | .write = serial_m3110_con_write, | |
250 | .device = serial_m3110_con_device, | |
251 | .setup = serial_m3110_con_setup, | |
252 | .flags = CON_PRINTBUFFER, | |
253 | .index = -1, | |
254 | .data = &serial_m3110_reg, | |
255 | }; | |
256 | ||
22510995 FT |
257 | static unsigned int serial_m3110_tx_empty(struct uart_port *port) |
258 | { | |
259 | return 1; | |
260 | } | |
261 | ||
262 | static void serial_m3110_stop_tx(struct uart_port *port) | |
263 | { | |
264 | return; | |
265 | } | |
266 | ||
267 | /* stop_rx will be called in spin_lock env */ | |
268 | static void serial_m3110_stop_rx(struct uart_port *port) | |
269 | { | |
270 | return; | |
271 | } | |
272 | ||
273 | #define WORDS_PER_XFER 128 | |
ee9b4500 | 274 | static void send_circ_buf(struct uart_max3110 *max, |
22510995 FT |
275 | struct circ_buf *xmit) |
276 | { | |
ee9b4500 FT |
277 | void *buf; |
278 | u16 *obuf, *ibuf; | |
22510995 | 279 | u8 valid_str[WORDS_PER_XFER]; |
ee9b4500 FT |
280 | int i, j, len, blen, dma_size, left, ret = 0; |
281 | ||
282 | ||
283 | dma_size = WORDS_PER_XFER * sizeof(u16) * 2; | |
284 | buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA); | |
285 | if (!buf) | |
286 | return; | |
287 | obuf = buf; | |
288 | ibuf = buf + dma_size/2; | |
22510995 FT |
289 | |
290 | while (!uart_circ_empty(xmit)) { | |
291 | left = uart_circ_chars_pending(xmit); | |
292 | while (left) { | |
ee9b4500 FT |
293 | len = min(left, WORDS_PER_XFER); |
294 | blen = len * sizeof(u16); | |
295 | memset(ibuf, 0, blen); | |
22510995 | 296 | |
22510995 FT |
297 | for (i = 0; i < len; i++) { |
298 | obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG; | |
299 | xmit->tail = (xmit->tail + 1) & | |
300 | (UART_XMIT_SIZE - 1); | |
301 | } | |
ee9b4500 FT |
302 | |
303 | /* Fail to send msg to console is not very critical */ | |
304 | ret = max3110_write_then_read(max, obuf, ibuf, blen, 0); | |
305 | if (ret) | |
306 | pr_warning(PR_FMT "%s(): get err msg %d\n", | |
307 | __func__, ret); | |
22510995 FT |
308 | |
309 | for (i = 0, j = 0; i < len; i++) { | |
310 | if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE) | |
ee9b4500 | 311 | valid_str[j++] = ibuf[i] & 0xff; |
22510995 FT |
312 | } |
313 | ||
314 | if (j) | |
315 | receive_chars(max, valid_str, j); | |
316 | ||
317 | max->port.icount.tx += len; | |
318 | left -= len; | |
319 | } | |
320 | } | |
ee9b4500 FT |
321 | |
322 | kfree(buf); | |
22510995 FT |
323 | } |
324 | ||
325 | static void transmit_char(struct uart_max3110 *max) | |
326 | { | |
327 | struct uart_port *port = &max->port; | |
328 | struct circ_buf *xmit = &port->state->xmit; | |
329 | ||
330 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) | |
331 | return; | |
332 | ||
333 | send_circ_buf(max, xmit); | |
334 | ||
335 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
336 | uart_write_wakeup(port); | |
337 | ||
338 | if (uart_circ_empty(xmit)) | |
339 | serial_m3110_stop_tx(port); | |
340 | } | |
341 | ||
ee9b4500 FT |
342 | /* |
343 | * This will be called by uart_write() and tty_write, can't | |
344 | * go to sleep | |
345 | */ | |
22510995 FT |
346 | static void serial_m3110_start_tx(struct uart_port *port) |
347 | { | |
348 | struct uart_max3110 *max = | |
349 | container_of(port, struct uart_max3110, port); | |
350 | ||
d6e679b4 | 351 | if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags)) |
22510995 | 352 | wake_up_process(max->main_thread); |
22510995 FT |
353 | } |
354 | ||
355 | static void receive_chars(struct uart_max3110 *max, unsigned char *str, int len) | |
356 | { | |
357 | struct uart_port *port = &max->port; | |
358 | struct tty_struct *tty; | |
359 | int usable; | |
360 | ||
361 | /* If uart is not opened, just return */ | |
362 | if (!port->state) | |
363 | return; | |
364 | ||
365 | tty = port->state->port.tty; | |
366 | if (!tty) | |
ee9b4500 | 367 | return; |
22510995 FT |
368 | |
369 | while (len) { | |
370 | usable = tty_buffer_request_room(tty, len); | |
371 | if (usable) { | |
372 | tty_insert_flip_string(tty, str, usable); | |
373 | str += usable; | |
374 | port->icount.rx += usable; | |
22510995 FT |
375 | } |
376 | len -= usable; | |
377 | } | |
ee9b4500 | 378 | tty_flip_buffer_push(tty); |
22510995 FT |
379 | } |
380 | ||
ee9b4500 FT |
381 | /* |
382 | * This routine will be used in read_thread or RX IRQ handling, | |
383 | * it will first do one round buffer read(8 words), if there is some | |
384 | * valid RX data, will try to read 5 more rounds till all data | |
385 | * is read out. | |
386 | * | |
387 | * Use stack space as data buffer to save some system load, and chose | |
388 | * 504 Btyes as a threadhold to do a bulk push to upper tty layer when | |
389 | * receiving bulk data, a much bigger buffer may cause stack overflow | |
390 | */ | |
391 | static void max3110_con_receive(struct uart_max3110 *max) | |
22510995 FT |
392 | { |
393 | int loop = 1, num, total = 0; | |
394 | u8 recv_buf[512], *pbuf; | |
395 | ||
396 | pbuf = recv_buf; | |
397 | do { | |
ee9b4500 | 398 | num = max3110_read_multi(max, pbuf); |
22510995 FT |
399 | |
400 | if (num) { | |
ee9b4500 | 401 | loop = 5; |
22510995 FT |
402 | pbuf += num; |
403 | total += num; | |
404 | ||
ee9b4500 | 405 | if (total >= 504) { |
22510995 FT |
406 | receive_chars(max, recv_buf, total); |
407 | pbuf = recv_buf; | |
408 | total = 0; | |
409 | } | |
410 | } | |
411 | } while (--loop); | |
412 | ||
413 | if (total) | |
414 | receive_chars(max, recv_buf, total); | |
415 | } | |
416 | ||
417 | static int max3110_main_thread(void *_max) | |
418 | { | |
419 | struct uart_max3110 *max = _max; | |
420 | wait_queue_head_t *wq = &max->wq; | |
421 | int ret = 0; | |
422 | struct circ_buf *xmit = &max->con_xmit; | |
423 | ||
424 | init_waitqueue_head(wq); | |
425 | pr_info(PR_FMT "start main thread\n"); | |
426 | ||
427 | do { | |
d6e679b4 | 428 | wait_event_interruptible(*wq, max->uart_flags || kthread_should_stop()); |
68c16b41 AV |
429 | |
430 | mutex_lock(&max->thread_mutex); | |
22510995 | 431 | |
d6e679b4 | 432 | if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags)) |
ee9b4500 | 433 | max3110_con_receive(max); |
22510995 FT |
434 | |
435 | /* first handle console output */ | |
d6e679b4 | 436 | if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags)) |
22510995 | 437 | send_circ_buf(max, xmit); |
22510995 FT |
438 | |
439 | /* handle uart output */ | |
d6e679b4 | 440 | if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags)) |
22510995 | 441 | transmit_char(max); |
d6e679b4 | 442 | |
68c16b41 | 443 | mutex_unlock(&max->thread_mutex); |
d6e679b4 | 444 | |
22510995 FT |
445 | } while (!kthread_should_stop()); |
446 | ||
447 | return ret; | |
448 | } | |
449 | ||
22510995 FT |
450 | static irqreturn_t serial_m3110_irq(int irq, void *dev_id) |
451 | { | |
452 | struct uart_max3110 *max = dev_id; | |
453 | ||
454 | /* max3110's irq is a falling edge, not level triggered, | |
455 | * so no need to disable the irq */ | |
d6e679b4 | 456 | if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags)) |
22510995 | 457 | wake_up_process(max->main_thread); |
d6e679b4 | 458 | |
22510995 FT |
459 | return IRQ_HANDLED; |
460 | } | |
91efa75c | 461 | |
22510995 FT |
462 | /* if don't use RX IRQ, then need a thread to polling read */ |
463 | static int max3110_read_thread(void *_max) | |
464 | { | |
465 | struct uart_max3110 *max = _max; | |
466 | ||
467 | pr_info(PR_FMT "start read thread\n"); | |
468 | do { | |
ee9b4500 FT |
469 | /* |
470 | * If can't acquire the mutex, it means the main thread | |
471 | * is running which will also perform the rx job | |
472 | */ | |
473 | if (mutex_trylock(&max->thread_mutex)) { | |
474 | max3110_con_receive(max); | |
475 | mutex_unlock(&max->thread_mutex); | |
476 | } | |
22510995 FT |
477 | |
478 | set_current_state(TASK_INTERRUPTIBLE); | |
479 | schedule_timeout(HZ / 20); | |
480 | } while (!kthread_should_stop()); | |
481 | ||
482 | return 0; | |
483 | } | |
22510995 FT |
484 | |
485 | static int serial_m3110_startup(struct uart_port *port) | |
486 | { | |
487 | struct uart_max3110 *max = | |
488 | container_of(port, struct uart_max3110, port); | |
489 | u16 config = 0; | |
490 | int ret = 0; | |
491 | ||
ee9b4500 | 492 | if (port->line != 0) { |
22510995 | 493 | pr_err(PR_FMT "uart port startup failed\n"); |
ee9b4500 FT |
494 | return -1; |
495 | } | |
22510995 | 496 | |
ee9b4500 | 497 | /* Disable all IRQ and config it to 115200, 8n1 */ |
22510995 FT |
498 | config = WC_TAG | WC_FIFO_ENABLE |
499 | | WC_1_STOPBITS | |
500 | | WC_8BIT_WORD | |
501 | | WC_BAUD_DR2; | |
22510995 FT |
502 | |
503 | /* as we use thread to handle tx/rx, need set low latency */ | |
504 | port->state->port.tty->low_latency = 1; | |
505 | ||
91efa75c AC |
506 | if (max->irq) { |
507 | max->read_thread = NULL; | |
508 | ret = request_irq(max->irq, serial_m3110_irq, | |
22510995 | 509 | IRQ_TYPE_EDGE_FALLING, "max3110", max); |
91efa75c AC |
510 | if (ret) { |
511 | max->irq = 0; | |
512 | pr_err(PR_FMT "unable to allocate IRQ, polling\n"); | |
513 | } else { | |
514 | /* Enable RX IRQ only */ | |
515 | config |= WC_RXA_IRQ_ENABLE; | |
516 | } | |
517 | } | |
22510995 | 518 | |
91efa75c AC |
519 | if (max->irq == 0) { |
520 | /* If IRQ is disabled, start a read thread for input data */ | |
521 | max->read_thread = | |
522 | kthread_run(max3110_read_thread, max, "max3110_read"); | |
523 | if (IS_ERR(max->read_thread)) { | |
524 | ret = PTR_ERR(max->read_thread); | |
525 | max->read_thread = NULL; | |
526 | pr_err(PR_FMT "Can't create read thread!\n"); | |
527 | return ret; | |
528 | } | |
ee9b4500 | 529 | } |
ee9b4500 FT |
530 | |
531 | ret = max3110_out(max, config); | |
532 | if (ret) { | |
91efa75c AC |
533 | if (max->irq) |
534 | free_irq(max->irq, max); | |
535 | if (max->read_thread) | |
536 | kthread_stop(max->read_thread); | |
ee9b4500 | 537 | max->read_thread = NULL; |
ee9b4500 FT |
538 | return ret; |
539 | } | |
22510995 FT |
540 | |
541 | max->cur_conf = config; | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static void serial_m3110_shutdown(struct uart_port *port) | |
546 | { | |
547 | struct uart_max3110 *max = | |
548 | container_of(port, struct uart_max3110, port); | |
549 | u16 config; | |
550 | ||
551 | if (max->read_thread) { | |
552 | kthread_stop(max->read_thread); | |
553 | max->read_thread = NULL; | |
554 | } | |
555 | ||
91efa75c AC |
556 | if (max->irq) |
557 | free_irq(max->irq, max); | |
22510995 FT |
558 | |
559 | /* Disable interrupts from this port */ | |
560 | config = WC_TAG | WC_SW_SHDI; | |
561 | max3110_out(max, config); | |
562 | } | |
563 | ||
564 | static void serial_m3110_release_port(struct uart_port *port) | |
565 | { | |
566 | } | |
567 | ||
568 | static int serial_m3110_request_port(struct uart_port *port) | |
569 | { | |
570 | return 0; | |
571 | } | |
572 | ||
573 | static void serial_m3110_config_port(struct uart_port *port, int flags) | |
574 | { | |
ee9b4500 | 575 | port->type = PORT_MAX3100; |
22510995 FT |
576 | } |
577 | ||
578 | static int | |
579 | serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser) | |
580 | { | |
581 | /* we don't want the core code to modify any port params */ | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | ||
586 | static const char *serial_m3110_type(struct uart_port *port) | |
587 | { | |
588 | struct uart_max3110 *max = | |
589 | container_of(port, struct uart_max3110, port); | |
590 | return max->name; | |
591 | } | |
592 | ||
593 | static void | |
594 | serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios, | |
595 | struct ktermios *old) | |
596 | { | |
597 | struct uart_max3110 *max = | |
598 | container_of(port, struct uart_max3110, port); | |
599 | unsigned char cval; | |
600 | unsigned int baud, parity = 0; | |
601 | int clk_div = -1; | |
602 | u16 new_conf = max->cur_conf; | |
603 | ||
604 | switch (termios->c_cflag & CSIZE) { | |
605 | case CS7: | |
606 | cval = UART_LCR_WLEN7; | |
607 | new_conf |= WC_7BIT_WORD; | |
608 | break; | |
609 | default: | |
ee9b4500 FT |
610 | /* We only support CS7 & CS8 */ |
611 | termios->c_cflag &= ~CSIZE; | |
612 | termios->c_cflag |= CS8; | |
22510995 FT |
613 | case CS8: |
614 | cval = UART_LCR_WLEN8; | |
615 | new_conf |= WC_8BIT_WORD; | |
616 | break; | |
617 | } | |
618 | ||
619 | baud = uart_get_baud_rate(port, termios, old, 0, 230400); | |
620 | ||
ee9b4500 | 621 | /* First calc the div for 1.8MHZ clock case */ |
22510995 FT |
622 | switch (baud) { |
623 | case 300: | |
624 | clk_div = WC_BAUD_DR384; | |
625 | break; | |
626 | case 600: | |
627 | clk_div = WC_BAUD_DR192; | |
628 | break; | |
629 | case 1200: | |
630 | clk_div = WC_BAUD_DR96; | |
631 | break; | |
632 | case 2400: | |
633 | clk_div = WC_BAUD_DR48; | |
634 | break; | |
635 | case 4800: | |
636 | clk_div = WC_BAUD_DR24; | |
637 | break; | |
638 | case 9600: | |
639 | clk_div = WC_BAUD_DR12; | |
640 | break; | |
641 | case 19200: | |
642 | clk_div = WC_BAUD_DR6; | |
643 | break; | |
644 | case 38400: | |
645 | clk_div = WC_BAUD_DR3; | |
646 | break; | |
647 | case 57600: | |
648 | clk_div = WC_BAUD_DR2; | |
649 | break; | |
650 | case 115200: | |
651 | clk_div = WC_BAUD_DR1; | |
652 | break; | |
653 | case 230400: | |
654 | if (max->clock & MAX3110_HIGH_CLK) | |
655 | break; | |
656 | default: | |
ee9b4500 | 657 | /* Pick the previous baud rate */ |
22510995 FT |
658 | baud = max->baud; |
659 | clk_div = max->cur_conf & WC_BAUD_DIV_MASK; | |
660 | tty_termios_encode_baud_rate(termios, baud, baud); | |
661 | } | |
662 | ||
663 | if (max->clock & MAX3110_HIGH_CLK) { | |
664 | clk_div += 1; | |
ee9b4500 FT |
665 | /* High clk version max3110 doesn't support B300 */ |
666 | if (baud == 300) { | |
22510995 | 667 | baud = 600; |
ee9b4500 FT |
668 | clk_div = WC_BAUD_DR384; |
669 | } | |
22510995 FT |
670 | if (baud == 230400) |
671 | clk_div = WC_BAUD_DR1; | |
672 | tty_termios_encode_baud_rate(termios, baud, baud); | |
673 | } | |
674 | ||
675 | new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div; | |
ee9b4500 FT |
676 | |
677 | if (unlikely(termios->c_cflag & CMSPAR)) | |
678 | termios->c_cflag &= ~CMSPAR; | |
679 | ||
22510995 FT |
680 | if (termios->c_cflag & CSTOPB) |
681 | new_conf |= WC_2_STOPBITS; | |
682 | else | |
683 | new_conf &= ~WC_2_STOPBITS; | |
684 | ||
685 | if (termios->c_cflag & PARENB) { | |
686 | new_conf |= WC_PARITY_ENABLE; | |
687 | parity |= UART_LCR_PARITY; | |
688 | } else | |
689 | new_conf &= ~WC_PARITY_ENABLE; | |
690 | ||
691 | if (!(termios->c_cflag & PARODD)) | |
692 | parity |= UART_LCR_EPAR; | |
693 | max->parity = parity; | |
694 | ||
695 | uart_update_timeout(port, termios->c_cflag, baud); | |
696 | ||
697 | new_conf |= WC_TAG; | |
698 | if (new_conf != max->cur_conf) { | |
ee9b4500 FT |
699 | if (!max3110_out(max, new_conf)) { |
700 | max->cur_conf = new_conf; | |
701 | max->baud = baud; | |
702 | } | |
22510995 FT |
703 | } |
704 | } | |
705 | ||
ee9b4500 | 706 | /* Don't handle hw handshaking */ |
22510995 FT |
707 | static unsigned int serial_m3110_get_mctrl(struct uart_port *port) |
708 | { | |
709 | return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR; | |
710 | } | |
711 | ||
712 | static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
713 | { | |
714 | } | |
715 | ||
716 | static void serial_m3110_break_ctl(struct uart_port *port, int break_state) | |
717 | { | |
718 | } | |
719 | ||
720 | static void serial_m3110_pm(struct uart_port *port, unsigned int state, | |
721 | unsigned int oldstate) | |
722 | { | |
723 | } | |
724 | ||
725 | static void serial_m3110_enable_ms(struct uart_port *port) | |
726 | { | |
727 | } | |
728 | ||
729 | struct uart_ops serial_m3110_ops = { | |
730 | .tx_empty = serial_m3110_tx_empty, | |
731 | .set_mctrl = serial_m3110_set_mctrl, | |
732 | .get_mctrl = serial_m3110_get_mctrl, | |
733 | .stop_tx = serial_m3110_stop_tx, | |
734 | .start_tx = serial_m3110_start_tx, | |
735 | .stop_rx = serial_m3110_stop_rx, | |
736 | .enable_ms = serial_m3110_enable_ms, | |
737 | .break_ctl = serial_m3110_break_ctl, | |
738 | .startup = serial_m3110_startup, | |
739 | .shutdown = serial_m3110_shutdown, | |
ee9b4500 | 740 | .set_termios = serial_m3110_set_termios, |
22510995 FT |
741 | .pm = serial_m3110_pm, |
742 | .type = serial_m3110_type, | |
743 | .release_port = serial_m3110_release_port, | |
744 | .request_port = serial_m3110_request_port, | |
745 | .config_port = serial_m3110_config_port, | |
746 | .verify_port = serial_m3110_verify_port, | |
747 | }; | |
748 | ||
749 | static struct uart_driver serial_m3110_reg = { | |
750 | .owner = THIS_MODULE, | |
751 | .driver_name = "MRST serial", | |
752 | .dev_name = "ttyS", | |
753 | .major = TTY_MAJOR, | |
754 | .minor = 64, | |
755 | .nr = 1, | |
ee9b4500 | 756 | .cons = &serial_m3110_console, |
22510995 FT |
757 | }; |
758 | ||
ee9b4500 | 759 | #ifdef CONFIG_PM |
22510995 FT |
760 | static int serial_m3110_suspend(struct spi_device *spi, pm_message_t state) |
761 | { | |
ee9b4500 FT |
762 | struct uart_max3110 *max = spi_get_drvdata(spi); |
763 | ||
764 | disable_irq(max->irq); | |
765 | uart_suspend_port(&serial_m3110_reg, &max->port); | |
766 | max3110_out(max, max->cur_conf | WC_SW_SHDI); | |
22510995 FT |
767 | return 0; |
768 | } | |
769 | ||
770 | static int serial_m3110_resume(struct spi_device *spi) | |
771 | { | |
ee9b4500 FT |
772 | struct uart_max3110 *max = spi_get_drvdata(spi); |
773 | ||
774 | max3110_out(max, max->cur_conf); | |
775 | uart_resume_port(&serial_m3110_reg, &max->port); | |
776 | enable_irq(max->irq); | |
22510995 FT |
777 | return 0; |
778 | } | |
ee9b4500 FT |
779 | #else |
780 | #define serial_m3110_suspend NULL | |
781 | #define serial_m3110_resume NULL | |
782 | #endif | |
22510995 | 783 | |
ee9b4500 | 784 | static int __devinit serial_m3110_probe(struct spi_device *spi) |
22510995 FT |
785 | { |
786 | struct uart_max3110 *max; | |
ee9b4500 | 787 | void *buffer; |
99dd3f6b | 788 | u16 res; |
ee9b4500 FT |
789 | int ret = 0; |
790 | ||
22510995 FT |
791 | max = kzalloc(sizeof(*max), GFP_KERNEL); |
792 | if (!max) | |
793 | return -ENOMEM; | |
794 | ||
ee9b4500 | 795 | /* Set spi info */ |
22510995 FT |
796 | spi->bits_per_word = 16; |
797 | max->clock = MAX3110_HIGH_CLK; | |
22510995 FT |
798 | |
799 | spi_setup(spi); | |
800 | ||
ee9b4500 FT |
801 | max->port.type = PORT_MAX3100; |
802 | max->port.fifosize = 2; /* Only have 16b buffer */ | |
22510995 FT |
803 | max->port.ops = &serial_m3110_ops; |
804 | max->port.line = 0; | |
805 | max->port.dev = &spi->dev; | |
806 | max->port.uartclk = 115200; | |
807 | ||
808 | max->spi = spi; | |
ee9b4500 | 809 | strcpy(max->name, spi->modalias); |
22510995 FT |
810 | max->irq = (u16)spi->irq; |
811 | ||
68c16b41 | 812 | mutex_init(&max->thread_mutex); |
22510995 FT |
813 | |
814 | max->word_7bits = 0; | |
815 | max->parity = 0; | |
816 | max->baud = 0; | |
817 | ||
818 | max->cur_conf = 0; | |
d6e679b4 AV |
819 | max->uart_flags = 0; |
820 | ||
99dd3f6b | 821 | /* Check if reading configuration register returns something sane */ |
822 | ||
823 | res = RC_TAG; | |
824 | ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0); | |
825 | if (ret < 0 || res == 0 || res == 0xffff) { | |
826 | printk(KERN_ERR "MAX3111 deemed not present (conf reg %04x)", | |
827 | res); | |
828 | ret = -ENODEV; | |
829 | goto err_get_page; | |
830 | } | |
ee9b4500 FT |
831 | |
832 | buffer = (void *)__get_free_page(GFP_KERNEL); | |
22510995 FT |
833 | if (!buffer) { |
834 | ret = -ENOMEM; | |
835 | goto err_get_page; | |
836 | } | |
ee9b4500 FT |
837 | max->con_xmit.buf = buffer; |
838 | max->con_xmit.head = 0; | |
839 | max->con_xmit.tail = 0; | |
22510995 FT |
840 | |
841 | max->main_thread = kthread_run(max3110_main_thread, | |
842 | max, "max3110_main"); | |
843 | if (IS_ERR(max->main_thread)) { | |
844 | ret = PTR_ERR(max->main_thread); | |
845 | goto err_kthread; | |
846 | } | |
847 | ||
ee9b4500 | 848 | spi_set_drvdata(spi, max); |
22510995 | 849 | pmax = max; |
ee9b4500 FT |
850 | |
851 | /* Give membase a psudo value to pass serial_core's check */ | |
22510995 FT |
852 | max->port.membase = (void *)0xff110000; |
853 | uart_add_one_port(&serial_m3110_reg, &max->port); | |
854 | ||
855 | return 0; | |
856 | ||
857 | err_kthread: | |
858 | free_page((unsigned long)buffer); | |
859 | err_get_page: | |
22510995 FT |
860 | kfree(max); |
861 | return ret; | |
862 | } | |
863 | ||
ee9b4500 | 864 | static int __devexit serial_m3110_remove(struct spi_device *dev) |
22510995 | 865 | { |
ee9b4500 | 866 | struct uart_max3110 *max = spi_get_drvdata(dev); |
22510995 | 867 | |
ee9b4500 | 868 | if (!max) |
22510995 FT |
869 | return 0; |
870 | ||
22510995 FT |
871 | uart_remove_one_port(&serial_m3110_reg, &max->port); |
872 | ||
873 | free_page((unsigned long)max->con_xmit.buf); | |
874 | ||
875 | if (max->main_thread) | |
876 | kthread_stop(max->main_thread); | |
877 | ||
878 | kfree(max); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static struct spi_driver uart_max3110_driver = { | |
883 | .driver = { | |
884 | .name = "spi_max3111", | |
885 | .bus = &spi_bus_type, | |
886 | .owner = THIS_MODULE, | |
887 | }, | |
888 | .probe = serial_m3110_probe, | |
ee9b4500 | 889 | .remove = __devexit_p(serial_m3110_remove), |
22510995 FT |
890 | .suspend = serial_m3110_suspend, |
891 | .resume = serial_m3110_resume, | |
892 | }; | |
893 | ||
ee9b4500 | 894 | static int __init serial_m3110_init(void) |
22510995 FT |
895 | { |
896 | int ret = 0; | |
897 | ||
898 | ret = uart_register_driver(&serial_m3110_reg); | |
899 | if (ret) | |
900 | return ret; | |
901 | ||
902 | ret = spi_register_driver(&uart_max3110_driver); | |
903 | if (ret) | |
904 | uart_unregister_driver(&serial_m3110_reg); | |
905 | ||
906 | return ret; | |
907 | } | |
908 | ||
ee9b4500 | 909 | static void __exit serial_m3110_exit(void) |
22510995 FT |
910 | { |
911 | spi_unregister_driver(&uart_max3110_driver); | |
912 | uart_unregister_driver(&serial_m3110_reg); | |
913 | } | |
914 | ||
915 | module_init(serial_m3110_init); | |
916 | module_exit(serial_m3110_exit); | |
917 | ||
ee9b4500 | 918 | MODULE_LICENSE("GPL v2"); |
22510995 | 919 | MODULE_ALIAS("max3110-uart"); |