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1 | /**************************************************************************** |
2 | * | |
3 | * Driver for the IFX 6x60 spi modem. | |
4 | * | |
5 | * Copyright (C) 2008 Option International | |
6 | * Copyright (C) 2008 Filip Aben <f.aben@option.com> | |
7 | * Denis Joseph Barrow <d.barow@option.com> | |
8 | * Jan Dumon <j.dumon@option.com> | |
9 | * | |
10 | * Copyright (C) 2009, 2010 Intel Corp | |
11 | * Russ Gorby <richardx.r.gorby@intel.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, | |
25 | * USA | |
26 | * | |
27 | * Driver modified by Intel from Option gtm501l_spi.c | |
28 | * | |
29 | * Notes | |
30 | * o The driver currently assumes a single device only. If you need to | |
31 | * change this then look for saved_ifx_dev and add a device lookup | |
32 | * o The driver is intended to be big-endian safe but has never been | |
33 | * tested that way (no suitable hardware). There are a couple of FIXME | |
34 | * notes by areas that may need addressing | |
35 | * o Some of the GPIO naming/setup assumptions may need revisiting if | |
36 | * you need to use this driver for another platform. | |
37 | * | |
38 | *****************************************************************************/ | |
39 | #include <linux/module.h> | |
40 | #include <linux/termios.h> | |
41 | #include <linux/tty.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/spi/spi.h> | |
44 | #include <linux/tty.h> | |
45 | #include <linux/kfifo.h> | |
46 | #include <linux/tty_flip.h> | |
47 | #include <linux/timer.h> | |
48 | #include <linux/serial.h> | |
49 | #include <linux/interrupt.h> | |
50 | #include <linux/irq.h> | |
51 | #include <linux/rfkill.h> | |
52 | #include <linux/fs.h> | |
53 | #include <linux/ip.h> | |
54 | #include <linux/dmapool.h> | |
55 | #include <linux/gpio.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/time.h> | |
58 | #include <linux/wait.h> | |
59 | #include <linux/tty.h> | |
60 | #include <linux/pm.h> | |
61 | #include <linux/pm_runtime.h> | |
62 | #include <linux/spi/ifx_modem.h> | |
63 | ||
64 | #include "ifx6x60.h" | |
65 | ||
66 | #define IFX_SPI_MORE_MASK 0x10 | |
67 | #define IFX_SPI_MORE_BIT 12 /* bit position in u16 */ | |
68 | #define IFX_SPI_CTS_BIT 13 /* bit position in u16 */ | |
69 | #define IFX_SPI_TTY_ID 0 | |
70 | #define IFX_SPI_TIMEOUT_SEC 2 | |
71 | #define IFX_SPI_HEADER_0 (-1) | |
72 | #define IFX_SPI_HEADER_F (-2) | |
73 | ||
74 | /* forward reference */ | |
75 | static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev); | |
76 | ||
77 | /* local variables */ | |
78 | static int spi_b16 = 1; /* 8 or 16 bit word length */ | |
79 | static struct tty_driver *tty_drv; | |
80 | static struct ifx_spi_device *saved_ifx_dev; | |
81 | static struct lock_class_key ifx_spi_key; | |
82 | ||
83 | /* GPIO/GPE settings */ | |
84 | ||
85 | /** | |
86 | * mrdy_set_high - set MRDY GPIO | |
87 | * @ifx: device we are controlling | |
88 | * | |
89 | */ | |
90 | static inline void mrdy_set_high(struct ifx_spi_device *ifx) | |
91 | { | |
92 | gpio_set_value(ifx->gpio.mrdy, 1); | |
93 | } | |
94 | ||
95 | /** | |
96 | * mrdy_set_low - clear MRDY GPIO | |
97 | * @ifx: device we are controlling | |
98 | * | |
99 | */ | |
100 | static inline void mrdy_set_low(struct ifx_spi_device *ifx) | |
101 | { | |
102 | gpio_set_value(ifx->gpio.mrdy, 0); | |
103 | } | |
104 | ||
105 | /** | |
106 | * ifx_spi_power_state_set | |
107 | * @ifx_dev: our SPI device | |
108 | * @val: bits to set | |
109 | * | |
110 | * Set bit in power status and signal power system if status becomes non-0 | |
111 | */ | |
112 | static void | |
113 | ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val) | |
114 | { | |
115 | unsigned long flags; | |
116 | ||
117 | spin_lock_irqsave(&ifx_dev->power_lock, flags); | |
118 | ||
119 | /* | |
120 | * if power status is already non-0, just update, else | |
121 | * tell power system | |
122 | */ | |
123 | if (!ifx_dev->power_status) | |
124 | pm_runtime_get(&ifx_dev->spi_dev->dev); | |
125 | ifx_dev->power_status |= val; | |
126 | ||
127 | spin_unlock_irqrestore(&ifx_dev->power_lock, flags); | |
128 | } | |
129 | ||
130 | /** | |
131 | * ifx_spi_power_state_clear - clear power bit | |
132 | * @ifx_dev: our SPI device | |
133 | * @val: bits to clear | |
134 | * | |
135 | * clear bit in power status and signal power system if status becomes 0 | |
136 | */ | |
137 | static void | |
138 | ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val) | |
139 | { | |
140 | unsigned long flags; | |
141 | ||
142 | spin_lock_irqsave(&ifx_dev->power_lock, flags); | |
143 | ||
144 | if (ifx_dev->power_status) { | |
145 | ifx_dev->power_status &= ~val; | |
146 | if (!ifx_dev->power_status) | |
147 | pm_runtime_put(&ifx_dev->spi_dev->dev); | |
148 | } | |
149 | ||
150 | spin_unlock_irqrestore(&ifx_dev->power_lock, flags); | |
151 | } | |
152 | ||
153 | /** | |
154 | * swap_buf | |
155 | * @buf: our buffer | |
156 | * @len : number of bytes (not words) in the buffer | |
157 | * @end: end of buffer | |
158 | * | |
159 | * Swap the contents of a buffer into big endian format | |
160 | */ | |
161 | static inline void swap_buf(u16 *buf, int len, void *end) | |
162 | { | |
163 | int n; | |
164 | ||
165 | len = ((len + 1) >> 1); | |
166 | if ((void *)&buf[len] > end) { | |
167 | pr_err("swap_buf: swap exceeds boundary (%p > %p)!", | |
168 | &buf[len], end); | |
169 | return; | |
170 | } | |
171 | for (n = 0; n < len; n++) { | |
172 | *buf = cpu_to_be16(*buf); | |
173 | buf++; | |
174 | } | |
175 | } | |
176 | ||
177 | /** | |
178 | * mrdy_assert - assert MRDY line | |
179 | * @ifx_dev: our SPI device | |
180 | * | |
181 | * Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low | |
182 | * now. | |
183 | * | |
184 | * FIXME: Can SRDY even go high as we are running this code ? | |
185 | */ | |
186 | static void mrdy_assert(struct ifx_spi_device *ifx_dev) | |
187 | { | |
188 | int val = gpio_get_value(ifx_dev->gpio.srdy); | |
189 | if (!val) { | |
190 | if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING, | |
191 | &ifx_dev->flags)) { | |
192 | ifx_dev->spi_timer.expires = | |
193 | jiffies + IFX_SPI_TIMEOUT_SEC*HZ; | |
194 | add_timer(&ifx_dev->spi_timer); | |
195 | ||
196 | } | |
197 | } | |
198 | ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING); | |
199 | mrdy_set_high(ifx_dev); | |
200 | } | |
201 | ||
202 | /** | |
203 | * ifx_spi_hangup - hang up an IFX device | |
204 | * @ifx_dev: our SPI device | |
205 | * | |
206 | * Hang up the tty attached to the IFX device if one is currently | |
207 | * open. If not take no action | |
208 | */ | |
209 | static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev) | |
210 | { | |
211 | struct tty_port *pport = &ifx_dev->tty_port; | |
212 | struct tty_struct *tty = tty_port_tty_get(pport); | |
213 | if (tty) { | |
214 | tty_hangup(tty); | |
215 | tty_kref_put(tty); | |
216 | } | |
217 | } | |
218 | ||
219 | /** | |
220 | * ifx_spi_timeout - SPI timeout | |
221 | * @arg: our SPI device | |
222 | * | |
223 | * The SPI has timed out: hang up the tty. Users will then see a hangup | |
224 | * and error events. | |
225 | */ | |
226 | static void ifx_spi_timeout(unsigned long arg) | |
227 | { | |
228 | struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg; | |
229 | ||
230 | dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***"); | |
231 | ifx_spi_ttyhangup(ifx_dev); | |
232 | mrdy_set_low(ifx_dev); | |
233 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); | |
234 | } | |
235 | ||
236 | /* char/tty operations */ | |
237 | ||
238 | /** | |
239 | * ifx_spi_tiocmget - get modem lines | |
240 | * @tty: our tty device | |
241 | * @filp: file handle issuing the request | |
242 | * | |
243 | * Map the signal state into Linux modem flags and report the value | |
244 | * in Linux terms | |
245 | */ | |
246 | static int ifx_spi_tiocmget(struct tty_struct *tty, struct file *filp) | |
247 | { | |
248 | unsigned int value; | |
249 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
250 | ||
251 | value = | |
252 | (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) | | |
253 | (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) | | |
254 | (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) | | |
255 | (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) | | |
256 | (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) | | |
257 | (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0); | |
258 | return value; | |
259 | } | |
260 | ||
261 | /** | |
262 | * ifx_spi_tiocmset - set modem bits | |
263 | * @tty: the tty structure | |
264 | * @filp: file handle issuing the request | |
265 | * @set: bits to set | |
266 | * @clear: bits to clear | |
267 | * | |
268 | * The IFX6x60 only supports DTR and RTS. Set them accordingly | |
269 | * and flag that an update to the modem is needed. | |
270 | * | |
271 | * FIXME: do we need to kick the tranfers when we do this ? | |
272 | */ | |
273 | static int ifx_spi_tiocmset(struct tty_struct *tty, struct file *filp, | |
274 | unsigned int set, unsigned int clear) | |
275 | { | |
276 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
277 | ||
278 | if (set & TIOCM_RTS) | |
279 | set_bit(IFX_SPI_RTS, &ifx_dev->signal_state); | |
280 | if (set & TIOCM_DTR) | |
281 | set_bit(IFX_SPI_DTR, &ifx_dev->signal_state); | |
282 | if (clear & TIOCM_RTS) | |
283 | clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state); | |
284 | if (clear & TIOCM_DTR) | |
285 | clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state); | |
286 | ||
287 | set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | /** | |
292 | * ifx_spi_open - called on tty open | |
293 | * @tty: our tty device | |
294 | * @filp: file handle being associated with the tty | |
295 | * | |
296 | * Open the tty interface. We let the tty_port layer do all the work | |
297 | * for us. | |
298 | * | |
299 | * FIXME: Remove single device assumption and saved_ifx_dev | |
300 | */ | |
301 | static int ifx_spi_open(struct tty_struct *tty, struct file *filp) | |
302 | { | |
303 | return tty_port_open(&saved_ifx_dev->tty_port, tty, filp); | |
304 | } | |
305 | ||
306 | /** | |
307 | * ifx_spi_close - called when our tty closes | |
308 | * @tty: the tty being closed | |
309 | * @filp: the file handle being closed | |
310 | * | |
311 | * Perform the close of the tty. We use the tty_port layer to do all | |
312 | * our hard work. | |
313 | */ | |
314 | static void ifx_spi_close(struct tty_struct *tty, struct file *filp) | |
315 | { | |
316 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
317 | tty_port_close(&ifx_dev->tty_port, tty, filp); | |
318 | /* FIXME: should we do an ifx_spi_reset here ? */ | |
319 | } | |
320 | ||
321 | /** | |
322 | * ifx_decode_spi_header - decode received header | |
323 | * @buffer: the received data | |
324 | * @length: decoded length | |
325 | * @more: decoded more flag | |
326 | * @received_cts: status of cts we received | |
327 | * | |
328 | * Note how received_cts is handled -- if header is all F it is left | |
329 | * the same as it was, if header is all 0 it is set to 0 otherwise it is | |
330 | * taken from the incoming header. | |
331 | * | |
332 | * FIXME: endianness | |
333 | */ | |
334 | static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length, | |
335 | unsigned char *more, unsigned char *received_cts) | |
336 | { | |
337 | u16 h1; | |
338 | u16 h2; | |
339 | u16 *in_buffer = (u16 *)buffer; | |
340 | ||
341 | h1 = *in_buffer; | |
342 | h2 = *(in_buffer+1); | |
343 | ||
344 | if (h1 == 0 && h2 == 0) { | |
345 | *received_cts = 0; | |
346 | return IFX_SPI_HEADER_0; | |
347 | } else if (h1 == 0xffff && h2 == 0xffff) { | |
348 | /* spi_slave_cts remains as it was */ | |
349 | return IFX_SPI_HEADER_F; | |
350 | } | |
351 | ||
352 | *length = h1 & 0xfff; /* upper bits of byte are flags */ | |
353 | *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1; | |
354 | *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /** | |
359 | * ifx_setup_spi_header - set header fields | |
360 | * @txbuffer: pointer to start of SPI buffer | |
361 | * @tx_count: bytes | |
362 | * @more: indicate if more to follow | |
363 | * | |
364 | * Format up an SPI header for a transfer | |
365 | * | |
366 | * FIXME: endianness? | |
367 | */ | |
368 | static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count, | |
369 | unsigned char more) | |
370 | { | |
371 | *(u16 *)(txbuffer) = tx_count; | |
372 | *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE; | |
373 | txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK; | |
374 | } | |
375 | ||
376 | /** | |
377 | * ifx_spi_wakeup_serial - SPI space made | |
378 | * @port_data: our SPI device | |
379 | * | |
380 | * We have emptied the FIFO enough that we want to get more data | |
381 | * queued into it. Poke the line discipline via tty_wakeup so that | |
382 | * it will feed us more bits | |
383 | */ | |
384 | static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev) | |
385 | { | |
386 | struct tty_struct *tty; | |
387 | ||
388 | tty = tty_port_tty_get(&ifx_dev->tty_port); | |
389 | if (!tty) | |
390 | return; | |
391 | tty_wakeup(tty); | |
392 | tty_kref_put(tty); | |
393 | } | |
394 | ||
395 | /** | |
396 | * ifx_spi_prepare_tx_buffer - prepare transmit frame | |
397 | * @ifx_dev: our SPI device | |
398 | * | |
399 | * The transmit buffr needs a header and various other bits of | |
400 | * information followed by as much data as we can pull from the FIFO | |
401 | * and transfer. This function formats up a suitable buffer in the | |
402 | * ifx_dev->tx_buffer | |
403 | * | |
404 | * FIXME: performance - should we wake the tty when the queue is half | |
405 | * empty ? | |
406 | */ | |
407 | static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev) | |
408 | { | |
409 | int temp_count; | |
410 | int queue_length; | |
411 | int tx_count; | |
412 | unsigned char *tx_buffer; | |
413 | ||
414 | tx_buffer = ifx_dev->tx_buffer; | |
415 | memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE); | |
416 | ||
417 | /* make room for required SPI header */ | |
418 | tx_buffer += IFX_SPI_HEADER_OVERHEAD; | |
419 | tx_count = IFX_SPI_HEADER_OVERHEAD; | |
420 | ||
421 | /* clear to signal no more data if this turns out to be the | |
422 | * last buffer sent in a sequence */ | |
423 | ifx_dev->spi_more = 0; | |
424 | ||
425 | /* if modem cts is set, just send empty buffer */ | |
426 | if (!ifx_dev->spi_slave_cts) { | |
427 | /* see if there's tx data */ | |
428 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
429 | if (queue_length != 0) { | |
430 | /* data to mux -- see if there's room for it */ | |
431 | temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE); | |
432 | temp_count = kfifo_out_locked(&ifx_dev->tx_fifo, | |
433 | tx_buffer, temp_count, | |
434 | &ifx_dev->fifo_lock); | |
435 | ||
436 | /* update buffer pointer and data count in message */ | |
437 | tx_buffer += temp_count; | |
438 | tx_count += temp_count; | |
439 | if (temp_count == queue_length) | |
440 | /* poke port to get more data */ | |
441 | ifx_spi_wakeup_serial(ifx_dev); | |
442 | else /* more data in port, use next SPI message */ | |
443 | ifx_dev->spi_more = 1; | |
444 | } | |
445 | } | |
446 | /* have data and info for header -- set up SPI header in buffer */ | |
447 | /* spi header needs payload size, not entire buffer size */ | |
448 | ifx_spi_setup_spi_header(ifx_dev->tx_buffer, | |
449 | tx_count-IFX_SPI_HEADER_OVERHEAD, | |
450 | ifx_dev->spi_more); | |
451 | /* swap actual data in the buffer */ | |
452 | swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count, | |
453 | &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]); | |
454 | return tx_count; | |
455 | } | |
456 | ||
457 | /** | |
458 | * ifx_spi_write - line discipline write | |
459 | * @tty: our tty device | |
460 | * @buf: pointer to buffer to write (kernel space) | |
461 | * @count: size of buffer | |
462 | * | |
463 | * Write the characters we have been given into the FIFO. If the device | |
464 | * is not active then activate it, when the SRDY line is asserted back | |
465 | * this will commence I/O | |
466 | */ | |
467 | static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf, | |
468 | int count) | |
469 | { | |
470 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
471 | unsigned char *tmp_buf = (unsigned char *)buf; | |
472 | int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count, | |
473 | &ifx_dev->fifo_lock); | |
474 | mrdy_assert(ifx_dev); | |
475 | return tx_count; | |
476 | } | |
477 | ||
478 | /** | |
479 | * ifx_spi_chars_in_buffer - line discipline helper | |
480 | * @tty: our tty device | |
481 | * | |
482 | * Report how much data we can accept before we drop bytes. As we use | |
483 | * a simple FIFO this is nice and easy. | |
484 | */ | |
485 | static int ifx_spi_write_room(struct tty_struct *tty) | |
486 | { | |
487 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
488 | return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo); | |
489 | } | |
490 | ||
491 | /** | |
492 | * ifx_spi_chars_in_buffer - line discipline helper | |
493 | * @tty: our tty device | |
494 | * | |
495 | * Report how many characters we have buffered. In our case this is the | |
496 | * number of bytes sitting in our transmit FIFO. | |
497 | */ | |
498 | static int ifx_spi_chars_in_buffer(struct tty_struct *tty) | |
499 | { | |
500 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
501 | return kfifo_len(&ifx_dev->tx_fifo); | |
502 | } | |
503 | ||
504 | /** | |
505 | * ifx_port_hangup | |
506 | * @port: our tty port | |
507 | * | |
508 | * tty port hang up. Called when tty_hangup processing is invoked either | |
509 | * by loss of carrier, or by software (eg vhangup). Serialized against | |
510 | * activate/shutdown by the tty layer. | |
511 | */ | |
512 | static void ifx_spi_hangup(struct tty_struct *tty) | |
513 | { | |
514 | struct ifx_spi_device *ifx_dev = tty->driver_data; | |
515 | tty_port_hangup(&ifx_dev->tty_port); | |
516 | } | |
517 | ||
518 | /** | |
519 | * ifx_port_activate | |
520 | * @port: our tty port | |
521 | * | |
522 | * tty port activate method - called for first open. Serialized | |
523 | * with hangup and shutdown by the tty layer. | |
524 | */ | |
525 | static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty) | |
526 | { | |
527 | struct ifx_spi_device *ifx_dev = | |
528 | container_of(port, struct ifx_spi_device, tty_port); | |
529 | ||
530 | /* clear any old data; can't do this in 'close' */ | |
531 | kfifo_reset(&ifx_dev->tx_fifo); | |
532 | ||
533 | /* put port data into this tty */ | |
534 | tty->driver_data = ifx_dev; | |
535 | ||
536 | /* allows flip string push from int context */ | |
537 | tty->low_latency = 1; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | /** | |
543 | * ifx_port_shutdown | |
544 | * @port: our tty port | |
545 | * | |
546 | * tty port shutdown method - called for last port close. Serialized | |
547 | * with hangup and activate by the tty layer. | |
548 | */ | |
549 | static void ifx_port_shutdown(struct tty_port *port) | |
550 | { | |
551 | struct ifx_spi_device *ifx_dev = | |
552 | container_of(port, struct ifx_spi_device, tty_port); | |
553 | ||
554 | mrdy_set_low(ifx_dev); | |
555 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); | |
556 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
557 | } | |
558 | ||
559 | static const struct tty_port_operations ifx_tty_port_ops = { | |
560 | .activate = ifx_port_activate, | |
561 | .shutdown = ifx_port_shutdown, | |
562 | }; | |
563 | ||
564 | static const struct tty_operations ifx_spi_serial_ops = { | |
565 | .open = ifx_spi_open, | |
566 | .close = ifx_spi_close, | |
567 | .write = ifx_spi_write, | |
568 | .hangup = ifx_spi_hangup, | |
569 | .write_room = ifx_spi_write_room, | |
570 | .chars_in_buffer = ifx_spi_chars_in_buffer, | |
571 | .tiocmget = ifx_spi_tiocmget, | |
572 | .tiocmset = ifx_spi_tiocmset, | |
573 | }; | |
574 | ||
575 | /** | |
576 | * ifx_spi_insert_fip_string - queue received data | |
577 | * @ifx_ser: our SPI device | |
578 | * @chars: buffer we have received | |
579 | * @size: number of chars reeived | |
580 | * | |
581 | * Queue bytes to the tty assuming the tty side is currently open. If | |
582 | * not the discard the data. | |
583 | */ | |
584 | static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev, | |
585 | unsigned char *chars, size_t size) | |
586 | { | |
587 | struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port); | |
588 | if (!tty) | |
589 | return; | |
590 | tty_insert_flip_string(tty, chars, size); | |
591 | tty_flip_buffer_push(tty); | |
592 | tty_kref_put(tty); | |
593 | } | |
594 | ||
595 | /** | |
596 | * ifx_spi_complete - SPI transfer completed | |
597 | * @ctx: our SPI device | |
598 | * | |
599 | * An SPI transfer has completed. Process any received data and kick off | |
600 | * any further transmits we can commence. | |
601 | */ | |
602 | static void ifx_spi_complete(void *ctx) | |
603 | { | |
604 | struct ifx_spi_device *ifx_dev = ctx; | |
605 | struct tty_struct *tty; | |
606 | struct tty_ldisc *ldisc = NULL; | |
607 | int length; | |
608 | int actual_length; | |
609 | unsigned char more; | |
610 | unsigned char cts; | |
611 | int local_write_pending = 0; | |
612 | int queue_length; | |
613 | int srdy; | |
614 | int decode_result; | |
615 | ||
616 | mrdy_set_low(ifx_dev); | |
617 | ||
618 | if (!ifx_dev->spi_msg.status) { | |
619 | /* check header validity, get comm flags */ | |
620 | swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD, | |
621 | &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]); | |
622 | decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer, | |
623 | &length, &more, &cts); | |
624 | if (decode_result == IFX_SPI_HEADER_0) { | |
625 | dev_dbg(&ifx_dev->spi_dev->dev, | |
626 | "ignore input: invalid header 0"); | |
627 | ifx_dev->spi_slave_cts = 0; | |
628 | goto complete_exit; | |
629 | } else if (decode_result == IFX_SPI_HEADER_F) { | |
630 | dev_dbg(&ifx_dev->spi_dev->dev, | |
631 | "ignore input: invalid header F"); | |
632 | goto complete_exit; | |
633 | } | |
634 | ||
635 | ifx_dev->spi_slave_cts = cts; | |
636 | ||
637 | actual_length = min((unsigned int)length, | |
638 | ifx_dev->spi_msg.actual_length); | |
639 | swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD), | |
640 | actual_length, | |
641 | &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]); | |
642 | ifx_spi_insert_flip_string( | |
643 | ifx_dev, | |
644 | ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD, | |
645 | (size_t)actual_length); | |
646 | } else { | |
647 | dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d", | |
648 | ifx_dev->spi_msg.status); | |
649 | } | |
650 | ||
651 | complete_exit: | |
652 | if (ifx_dev->write_pending) { | |
653 | ifx_dev->write_pending = 0; | |
654 | local_write_pending = 1; | |
655 | } | |
656 | ||
657 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags)); | |
658 | ||
659 | queue_length = kfifo_len(&ifx_dev->tx_fifo); | |
660 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
661 | if (!srdy) | |
662 | ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY); | |
663 | ||
664 | /* schedule output if there is more to do */ | |
665 | if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags)) | |
666 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
667 | else { | |
668 | if (more || ifx_dev->spi_more || queue_length > 0 || | |
669 | local_write_pending) { | |
670 | if (ifx_dev->spi_slave_cts) { | |
671 | if (more) | |
672 | mrdy_assert(ifx_dev); | |
673 | } else | |
674 | mrdy_assert(ifx_dev); | |
675 | } else { | |
676 | /* | |
677 | * poke line discipline driver if any for more data | |
678 | * may or may not get more data to write | |
679 | * for now, say not busy | |
680 | */ | |
681 | ifx_spi_power_state_clear(ifx_dev, | |
682 | IFX_SPI_POWER_DATA_PENDING); | |
683 | tty = tty_port_tty_get(&ifx_dev->tty_port); | |
684 | if (tty) { | |
685 | ldisc = tty_ldisc_ref(tty); | |
686 | if (ldisc) { | |
687 | ldisc->ops->write_wakeup(tty); | |
688 | tty_ldisc_deref(ldisc); | |
689 | } | |
690 | tty_kref_put(tty); | |
691 | } | |
692 | } | |
693 | } | |
694 | } | |
695 | ||
696 | /** | |
697 | * ifx_spio_io - I/O tasklet | |
698 | * @data: our SPI device | |
699 | * | |
700 | * Queue data for transmission if possible and then kick off the | |
701 | * transfer. | |
702 | */ | |
703 | static void ifx_spi_io(unsigned long data) | |
704 | { | |
705 | int retval; | |
706 | struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data; | |
707 | ||
708 | if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) { | |
709 | if (ifx_dev->gpio.unack_srdy_int_nb > 0) | |
710 | ifx_dev->gpio.unack_srdy_int_nb--; | |
711 | ||
712 | ifx_spi_prepare_tx_buffer(ifx_dev); | |
713 | ||
714 | spi_message_init(&ifx_dev->spi_msg); | |
715 | INIT_LIST_HEAD(&ifx_dev->spi_msg.queue); | |
716 | ||
717 | ifx_dev->spi_msg.context = ifx_dev; | |
718 | ifx_dev->spi_msg.complete = ifx_spi_complete; | |
719 | ||
720 | /* set up our spi transfer */ | |
721 | /* note len is BYTES, not transfers */ | |
722 | ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE; | |
723 | ifx_dev->spi_xfer.cs_change = 0; | |
724 | ifx_dev->spi_xfer.speed_hz = 12500000; | |
725 | /* ifx_dev->spi_xfer.speed_hz = 390625; */ | |
726 | ifx_dev->spi_xfer.bits_per_word = spi_b16 ? 16 : 8; | |
727 | ||
728 | ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer; | |
729 | ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer; | |
730 | ||
731 | /* | |
732 | * setup dma pointers | |
733 | */ | |
734 | if (ifx_dev->is_6160) { | |
735 | ifx_dev->spi_msg.is_dma_mapped = 1; | |
736 | ifx_dev->tx_dma = ifx_dev->tx_bus; | |
737 | ifx_dev->rx_dma = ifx_dev->rx_bus; | |
738 | ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma; | |
739 | ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma; | |
740 | } else { | |
741 | ifx_dev->spi_msg.is_dma_mapped = 0; | |
742 | ifx_dev->tx_dma = (dma_addr_t)0; | |
743 | ifx_dev->rx_dma = (dma_addr_t)0; | |
744 | ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0; | |
745 | ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0; | |
746 | } | |
747 | ||
748 | spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg); | |
749 | ||
750 | /* Assert MRDY. This may have already been done by the write | |
751 | * routine. | |
752 | */ | |
753 | mrdy_assert(ifx_dev); | |
754 | ||
755 | retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg); | |
756 | if (retval) { | |
757 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, | |
758 | &ifx_dev->flags); | |
759 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
760 | return; | |
761 | } | |
762 | } else | |
763 | ifx_dev->write_pending = 1; | |
764 | } | |
765 | ||
766 | /** | |
767 | * ifx_spi_free_port - free up the tty side | |
768 | * @ifx_dev: IFX device going away | |
769 | * | |
770 | * Unregister and free up a port when the device goes away | |
771 | */ | |
772 | static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev) | |
773 | { | |
774 | if (ifx_dev->tty_dev) | |
775 | tty_unregister_device(tty_drv, ifx_dev->minor); | |
776 | kfifo_free(&ifx_dev->tx_fifo); | |
777 | } | |
778 | ||
779 | /** | |
780 | * ifx_spi_create_port - create a new port | |
781 | * @ifx_dev: our spi device | |
782 | * | |
783 | * Allocate and initialise the tty port that goes with this interface | |
784 | * and add it to the tty layer so that it can be opened. | |
785 | */ | |
786 | static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev) | |
787 | { | |
788 | int ret = 0; | |
789 | struct tty_port *pport = &ifx_dev->tty_port; | |
790 | ||
791 | spin_lock_init(&ifx_dev->fifo_lock); | |
792 | lockdep_set_class_and_subclass(&ifx_dev->fifo_lock, | |
793 | &ifx_spi_key, 0); | |
794 | ||
795 | if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) { | |
796 | ret = -ENOMEM; | |
797 | goto error_ret; | |
798 | } | |
799 | ||
800 | pport->ops = &ifx_tty_port_ops; | |
801 | tty_port_init(pport); | |
802 | ifx_dev->minor = IFX_SPI_TTY_ID; | |
803 | ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor, | |
804 | &ifx_dev->spi_dev->dev); | |
805 | if (IS_ERR(ifx_dev->tty_dev)) { | |
806 | dev_dbg(&ifx_dev->spi_dev->dev, | |
807 | "%s: registering tty device failed", __func__); | |
808 | ret = PTR_ERR(ifx_dev->tty_dev); | |
809 | goto error_ret; | |
810 | } | |
811 | return 0; | |
812 | ||
813 | error_ret: | |
814 | ifx_spi_free_port(ifx_dev); | |
815 | return ret; | |
816 | } | |
817 | ||
818 | /** | |
819 | * ifx_spi_handle_srdy - handle SRDY | |
820 | * @ifx_dev: device asserting SRDY | |
821 | * | |
822 | * Check our device state and see what we need to kick off when SRDY | |
823 | * is asserted. This usually means killing the timer and firing off the | |
824 | * I/O processing. | |
825 | */ | |
826 | static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev) | |
827 | { | |
828 | if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) { | |
829 | del_timer_sync(&ifx_dev->spi_timer); | |
830 | clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags); | |
831 | } | |
832 | ||
833 | ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY); | |
834 | ||
835 | if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) | |
836 | tasklet_schedule(&ifx_dev->io_work_tasklet); | |
837 | else | |
838 | set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags); | |
839 | } | |
840 | ||
841 | /** | |
842 | * ifx_spi_srdy_interrupt - SRDY asserted | |
843 | * @irq: our IRQ number | |
844 | * @dev: our ifx device | |
845 | * | |
846 | * The modem asserted SRDY. Handle the srdy event | |
847 | */ | |
848 | static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev) | |
849 | { | |
850 | struct ifx_spi_device *ifx_dev = dev; | |
851 | ifx_dev->gpio.unack_srdy_int_nb++; | |
852 | ifx_spi_handle_srdy(ifx_dev); | |
853 | return IRQ_HANDLED; | |
854 | } | |
855 | ||
856 | /** | |
857 | * ifx_spi_reset_interrupt - Modem has changed reset state | |
858 | * @irq: interrupt number | |
859 | * @dev: our device pointer | |
860 | * | |
861 | * The modem has either entered or left reset state. Check the GPIO | |
862 | * line to see which. | |
863 | * | |
864 | * FIXME: review locking on MR_INPROGRESS versus | |
865 | * parallel unsolicited reset/solicited reset | |
866 | */ | |
867 | static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev) | |
868 | { | |
869 | struct ifx_spi_device *ifx_dev = dev; | |
870 | int val = gpio_get_value(ifx_dev->gpio.reset_out); | |
871 | int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state); | |
872 | ||
873 | if (val == 0) { | |
874 | /* entered reset */ | |
875 | set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
876 | if (!solreset) { | |
877 | /* unsolicited reset */ | |
878 | ifx_spi_ttyhangup(ifx_dev); | |
879 | } | |
880 | } else { | |
881 | /* exited reset */ | |
882 | clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state); | |
883 | if (solreset) { | |
884 | set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state); | |
885 | wake_up(&ifx_dev->mdm_reset_wait); | |
886 | } | |
887 | } | |
888 | return IRQ_HANDLED; | |
889 | } | |
890 | ||
891 | /** | |
892 | * ifx_spi_free_device - free device | |
893 | * @ifx_dev: device to free | |
894 | * | |
895 | * Free the IFX device | |
896 | */ | |
897 | static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev) | |
898 | { | |
899 | ifx_spi_free_port(ifx_dev); | |
900 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
901 | IFX_SPI_TRANSFER_SIZE, | |
902 | ifx_dev->tx_buffer, | |
903 | ifx_dev->tx_bus); | |
904 | dma_free_coherent(&ifx_dev->spi_dev->dev, | |
905 | IFX_SPI_TRANSFER_SIZE, | |
906 | ifx_dev->rx_buffer, | |
907 | ifx_dev->rx_bus); | |
908 | } | |
909 | ||
910 | /** | |
911 | * ifx_spi_reset - reset modem | |
912 | * @ifx_dev: modem to reset | |
913 | * | |
914 | * Perform a reset on the modem | |
915 | */ | |
916 | static int ifx_spi_reset(struct ifx_spi_device *ifx_dev) | |
917 | { | |
918 | int ret; | |
919 | /* | |
920 | * set up modem power, reset | |
921 | * | |
922 | * delays are required on some platforms for the modem | |
923 | * to reset properly | |
924 | */ | |
925 | set_bit(MR_START, &ifx_dev->mdm_reset_state); | |
926 | gpio_set_value(ifx_dev->gpio.po, 0); | |
927 | gpio_set_value(ifx_dev->gpio.reset, 0); | |
928 | msleep(25); | |
929 | gpio_set_value(ifx_dev->gpio.reset, 1); | |
930 | msleep(1); | |
931 | gpio_set_value(ifx_dev->gpio.po, 1); | |
932 | msleep(1); | |
933 | gpio_set_value(ifx_dev->gpio.po, 0); | |
934 | ret = wait_event_timeout(ifx_dev->mdm_reset_wait, | |
935 | test_bit(MR_COMPLETE, | |
936 | &ifx_dev->mdm_reset_state), | |
937 | IFX_RESET_TIMEOUT); | |
938 | if (!ret) | |
939 | dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)", | |
940 | ifx_dev->mdm_reset_state); | |
941 | ||
942 | ifx_dev->mdm_reset_state = 0; | |
943 | return ret; | |
944 | } | |
945 | ||
946 | /** | |
947 | * ifx_spi_spi_probe - probe callback | |
948 | * @spi: our possible matching SPI device | |
949 | * | |
950 | * Probe for a 6x60 modem on SPI bus. Perform any needed device and | |
951 | * GPIO setup. | |
952 | * | |
953 | * FIXME: | |
954 | * - Support for multiple devices | |
955 | * - Split out MID specific GPIO handling eventually | |
956 | */ | |
957 | ||
958 | static int ifx_spi_spi_probe(struct spi_device *spi) | |
959 | { | |
960 | int ret; | |
961 | int srdy; | |
962 | struct ifx_modem_platform_data *pl_data = NULL; | |
963 | struct ifx_spi_device *ifx_dev; | |
964 | ||
965 | if (saved_ifx_dev) { | |
966 | dev_dbg(&spi->dev, "ignoring subsequent detection"); | |
967 | return -ENODEV; | |
968 | } | |
969 | ||
970 | /* initialize structure to hold our device variables */ | |
971 | ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL); | |
972 | if (!ifx_dev) { | |
973 | dev_err(&spi->dev, "spi device allocation failed"); | |
974 | return -ENOMEM; | |
975 | } | |
976 | saved_ifx_dev = ifx_dev; | |
977 | ifx_dev->spi_dev = spi; | |
978 | clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags); | |
979 | spin_lock_init(&ifx_dev->write_lock); | |
980 | spin_lock_init(&ifx_dev->power_lock); | |
981 | ifx_dev->power_status = 0; | |
982 | init_timer(&ifx_dev->spi_timer); | |
983 | ifx_dev->spi_timer.function = ifx_spi_timeout; | |
984 | ifx_dev->spi_timer.data = (unsigned long)ifx_dev; | |
985 | ifx_dev->is_6160 = pl_data->is_6160; | |
986 | ||
987 | /* ensure SPI protocol flags are initialized to enable transfer */ | |
988 | ifx_dev->spi_more = 0; | |
989 | ifx_dev->spi_slave_cts = 0; | |
990 | ||
991 | /*initialize transfer and dma buffers */ | |
992 | ifx_dev->tx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev, | |
993 | IFX_SPI_TRANSFER_SIZE, | |
994 | &ifx_dev->tx_bus, | |
995 | GFP_KERNEL); | |
996 | if (!ifx_dev->tx_buffer) { | |
997 | dev_err(&spi->dev, "DMA-TX buffer allocation failed"); | |
998 | ret = -ENOMEM; | |
999 | goto error_ret; | |
1000 | } | |
1001 | ifx_dev->rx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev, | |
1002 | IFX_SPI_TRANSFER_SIZE, | |
1003 | &ifx_dev->rx_bus, | |
1004 | GFP_KERNEL); | |
1005 | if (!ifx_dev->rx_buffer) { | |
1006 | dev_err(&spi->dev, "DMA-RX buffer allocation failed"); | |
1007 | ret = -ENOMEM; | |
1008 | goto error_ret; | |
1009 | } | |
1010 | ||
1011 | /* initialize waitq for modem reset */ | |
1012 | init_waitqueue_head(&ifx_dev->mdm_reset_wait); | |
1013 | ||
1014 | spi_set_drvdata(spi, ifx_dev); | |
1015 | tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io, | |
1016 | (unsigned long)ifx_dev); | |
1017 | ||
1018 | set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags); | |
1019 | ||
1020 | /* create our tty port */ | |
1021 | ret = ifx_spi_create_port(ifx_dev); | |
1022 | if (ret != 0) { | |
1023 | dev_err(&spi->dev, "create default tty port failed"); | |
1024 | goto error_ret; | |
1025 | } | |
1026 | ||
1027 | pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data; | |
1028 | if (pl_data) { | |
1029 | ifx_dev->gpio.reset = pl_data->rst_pmu; | |
1030 | ifx_dev->gpio.po = pl_data->pwr_on; | |
1031 | ifx_dev->gpio.mrdy = pl_data->mrdy; | |
1032 | ifx_dev->gpio.srdy = pl_data->srdy; | |
1033 | ifx_dev->gpio.reset_out = pl_data->rst_out; | |
1034 | } else { | |
1035 | dev_err(&spi->dev, "missing platform data!"); | |
1036 | ret = -ENODEV; | |
1037 | goto error_ret; | |
1038 | } | |
1039 | ||
1040 | dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d", | |
1041 | ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy, | |
1042 | ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out); | |
1043 | ||
1044 | /* Configure gpios */ | |
1045 | ret = gpio_request(ifx_dev->gpio.reset, "ifxModem"); | |
1046 | if (ret < 0) { | |
1047 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)", | |
1048 | ifx_dev->gpio.reset); | |
1049 | goto error_ret; | |
1050 | } | |
1051 | ret += gpio_direction_output(ifx_dev->gpio.reset, 0); | |
1052 | ret += gpio_export(ifx_dev->gpio.reset, 1); | |
1053 | if (ret) { | |
1054 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)", | |
1055 | ifx_dev->gpio.reset); | |
1056 | ret = -EBUSY; | |
1057 | goto error_ret2; | |
1058 | } | |
1059 | ||
1060 | ret = gpio_request(ifx_dev->gpio.po, "ifxModem"); | |
1061 | ret += gpio_direction_output(ifx_dev->gpio.po, 0); | |
1062 | ret += gpio_export(ifx_dev->gpio.po, 1); | |
1063 | if (ret) { | |
1064 | dev_err(&spi->dev, "Unable to configure GPIO%d (ON)", | |
1065 | ifx_dev->gpio.po); | |
1066 | ret = -EBUSY; | |
1067 | goto error_ret3; | |
1068 | } | |
1069 | ||
1070 | ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem"); | |
1071 | if (ret < 0) { | |
1072 | dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)", | |
1073 | ifx_dev->gpio.mrdy); | |
1074 | goto error_ret3; | |
1075 | } | |
1076 | ret += gpio_export(ifx_dev->gpio.mrdy, 1); | |
1077 | ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0); | |
1078 | if (ret) { | |
1079 | dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)", | |
1080 | ifx_dev->gpio.mrdy); | |
1081 | ret = -EBUSY; | |
1082 | goto error_ret4; | |
1083 | } | |
1084 | ||
1085 | ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem"); | |
1086 | if (ret < 0) { | |
1087 | dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)", | |
1088 | ifx_dev->gpio.srdy); | |
1089 | ret = -EBUSY; | |
1090 | goto error_ret4; | |
1091 | } | |
1092 | ret += gpio_export(ifx_dev->gpio.srdy, 1); | |
1093 | ret += gpio_direction_input(ifx_dev->gpio.srdy); | |
1094 | if (ret) { | |
1095 | dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)", | |
1096 | ifx_dev->gpio.srdy); | |
1097 | ret = -EBUSY; | |
1098 | goto error_ret5; | |
1099 | } | |
1100 | ||
1101 | ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem"); | |
1102 | if (ret < 0) { | |
1103 | dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)", | |
1104 | ifx_dev->gpio.reset_out); | |
1105 | goto error_ret5; | |
1106 | } | |
1107 | ret += gpio_export(ifx_dev->gpio.reset_out, 1); | |
1108 | ret += gpio_direction_input(ifx_dev->gpio.reset_out); | |
1109 | if (ret) { | |
1110 | dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)", | |
1111 | ifx_dev->gpio.reset_out); | |
1112 | ret = -EBUSY; | |
1113 | goto error_ret6; | |
1114 | } | |
1115 | ||
1116 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out), | |
1117 | ifx_spi_reset_interrupt, | |
1118 | IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME, | |
1119 | (void *)ifx_dev); | |
1120 | if (ret) { | |
1121 | dev_err(&spi->dev, "Unable to get irq %x\n", | |
1122 | gpio_to_irq(ifx_dev->gpio.reset_out)); | |
1123 | goto error_ret6; | |
1124 | } | |
1125 | ||
1126 | ret = ifx_spi_reset(ifx_dev); | |
1127 | ||
1128 | ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy), | |
1129 | ifx_spi_srdy_interrupt, | |
1130 | IRQF_TRIGGER_RISING, DRVNAME, | |
1131 | (void *)ifx_dev); | |
1132 | if (ret) { | |
1133 | dev_err(&spi->dev, "Unable to get irq %x", | |
1134 | gpio_to_irq(ifx_dev->gpio.srdy)); | |
1135 | goto error_ret6; | |
1136 | } | |
1137 | ||
1138 | /* set pm runtime power state and register with power system */ | |
1139 | pm_runtime_set_active(&spi->dev); | |
1140 | pm_runtime_enable(&spi->dev); | |
1141 | ||
1142 | /* handle case that modem is already signaling SRDY */ | |
1143 | /* no outgoing tty open at this point, this just satisfies the | |
1144 | * modem's read and should reset communication properly | |
1145 | */ | |
1146 | srdy = gpio_get_value(ifx_dev->gpio.srdy); | |
1147 | ||
1148 | if (srdy) { | |
1149 | mrdy_assert(ifx_dev); | |
1150 | ifx_spi_handle_srdy(ifx_dev); | |
1151 | } else | |
1152 | mrdy_set_low(ifx_dev); | |
1153 | return 0; | |
1154 | ||
1155 | error_ret6: | |
1156 | gpio_free(ifx_dev->gpio.srdy); | |
1157 | error_ret5: | |
1158 | gpio_free(ifx_dev->gpio.mrdy); | |
1159 | error_ret4: | |
1160 | gpio_free(ifx_dev->gpio.reset); | |
1161 | error_ret3: | |
1162 | gpio_free(ifx_dev->gpio.po); | |
1163 | error_ret2: | |
1164 | gpio_free(ifx_dev->gpio.reset_out); | |
1165 | error_ret: | |
1166 | ifx_spi_free_device(ifx_dev); | |
1167 | saved_ifx_dev = NULL; | |
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | /** | |
1172 | * ifx_spi_spi_remove - SPI device was removed | |
1173 | * @spi: SPI device | |
1174 | * | |
1175 | * FIXME: We should be shutting the device down here not in | |
1176 | * the module unload path. | |
1177 | */ | |
1178 | ||
1179 | static int ifx_spi_spi_remove(struct spi_device *spi) | |
1180 | { | |
1181 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1182 | /* stop activity */ | |
1183 | tasklet_kill(&ifx_dev->io_work_tasklet); | |
1184 | /* free irq */ | |
1185 | free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev); | |
1186 | free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev); | |
1187 | ||
1188 | gpio_free(ifx_dev->gpio.srdy); | |
1189 | gpio_free(ifx_dev->gpio.mrdy); | |
1190 | gpio_free(ifx_dev->gpio.reset); | |
1191 | gpio_free(ifx_dev->gpio.po); | |
1192 | gpio_free(ifx_dev->gpio.reset_out); | |
1193 | ||
1194 | /* free allocations */ | |
1195 | ifx_spi_free_device(ifx_dev); | |
1196 | ||
1197 | saved_ifx_dev = NULL; | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /** | |
1202 | * ifx_spi_spi_shutdown - called on SPI shutdown | |
1203 | * @spi: SPI device | |
1204 | * | |
1205 | * No action needs to be taken here | |
1206 | */ | |
1207 | ||
1208 | static void ifx_spi_spi_shutdown(struct spi_device *spi) | |
1209 | { | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * various suspends and resumes have nothing to do | |
1214 | * no hardware to save state for | |
1215 | */ | |
1216 | ||
1217 | /** | |
1218 | * ifx_spi_spi_suspend - suspend SPI on system suspend | |
1219 | * @dev: device being suspended | |
1220 | * | |
1221 | * Suspend the SPI side. No action needed on Intel MID platforms, may | |
1222 | * need extending for other systems. | |
1223 | */ | |
1224 | static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg) | |
1225 | { | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | /** | |
1230 | * ifx_spi_spi_resume - resume SPI side on system resume | |
1231 | * @dev: device being suspended | |
1232 | * | |
1233 | * Suspend the SPI side. No action needed on Intel MID platforms, may | |
1234 | * need extending for other systems. | |
1235 | */ | |
1236 | static int ifx_spi_spi_resume(struct spi_device *spi) | |
1237 | { | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /** | |
1242 | * ifx_spi_pm_suspend - suspend modem on system suspend | |
1243 | * @dev: device being suspended | |
1244 | * | |
1245 | * Suspend the modem. No action needed on Intel MID platforms, may | |
1246 | * need extending for other systems. | |
1247 | */ | |
1248 | static int ifx_spi_pm_suspend(struct device *dev) | |
1249 | { | |
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * ifx_spi_pm_resume - resume modem on system resume | |
1255 | * @dev: device being suspended | |
1256 | * | |
1257 | * Allow the modem to resume. No action needed. | |
1258 | * | |
1259 | * FIXME: do we need to reset anything here ? | |
1260 | */ | |
1261 | static int ifx_spi_pm_resume(struct device *dev) | |
1262 | { | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | /** | |
1267 | * ifx_spi_pm_runtime_resume - suspend modem | |
1268 | * @dev: device being suspended | |
1269 | * | |
1270 | * Allow the modem to resume. No action needed. | |
1271 | */ | |
1272 | static int ifx_spi_pm_runtime_resume(struct device *dev) | |
1273 | { | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | /** | |
1278 | * ifx_spi_pm_runtime_suspend - suspend modem | |
1279 | * @dev: device being suspended | |
1280 | * | |
1281 | * Allow the modem to suspend and thus suspend to continue up the | |
1282 | * device tree. | |
1283 | */ | |
1284 | static int ifx_spi_pm_runtime_suspend(struct device *dev) | |
1285 | { | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /** | |
1290 | * ifx_spi_pm_runtime_idle - check if modem idle | |
1291 | * @dev: our device | |
1292 | * | |
1293 | * Check conditions and queue runtime suspend if idle. | |
1294 | */ | |
1295 | static int ifx_spi_pm_runtime_idle(struct device *dev) | |
1296 | { | |
1297 | struct spi_device *spi = to_spi_device(dev); | |
1298 | struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); | |
1299 | ||
1300 | if (!ifx_dev->power_status) | |
1301 | pm_runtime_suspend(dev); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static const struct dev_pm_ops ifx_spi_pm = { | |
1307 | .resume = ifx_spi_pm_resume, | |
1308 | .suspend = ifx_spi_pm_suspend, | |
1309 | .runtime_resume = ifx_spi_pm_runtime_resume, | |
1310 | .runtime_suspend = ifx_spi_pm_runtime_suspend, | |
1311 | .runtime_idle = ifx_spi_pm_runtime_idle | |
1312 | }; | |
1313 | ||
1314 | static const struct spi_device_id ifx_id_table[] = { | |
1315 | {"ifx6160", 0}, | |
1316 | {"ifx6260", 0}, | |
1317 | { } | |
1318 | }; | |
1319 | MODULE_DEVICE_TABLE(spi, ifx_id_table); | |
1320 | ||
1321 | /* spi operations */ | |
1322 | static const struct spi_driver ifx_spi_driver_6160 = { | |
1323 | .driver = { | |
1324 | .name = "ifx6160", | |
1325 | .bus = &spi_bus_type, | |
1326 | .pm = &ifx_spi_pm, | |
1327 | .owner = THIS_MODULE}, | |
1328 | .probe = ifx_spi_spi_probe, | |
1329 | .shutdown = ifx_spi_spi_shutdown, | |
1330 | .remove = __devexit_p(ifx_spi_spi_remove), | |
1331 | .suspend = ifx_spi_spi_suspend, | |
1332 | .resume = ifx_spi_spi_resume, | |
1333 | .id_table = ifx_id_table | |
1334 | }; | |
1335 | ||
1336 | /** | |
1337 | * ifx_spi_exit - module exit | |
1338 | * | |
1339 | * Unload the module. | |
1340 | */ | |
1341 | ||
1342 | static void __exit ifx_spi_exit(void) | |
1343 | { | |
1344 | /* unregister */ | |
1345 | tty_unregister_driver(tty_drv); | |
1346 | spi_unregister_driver((void *)&ifx_spi_driver_6160); | |
1347 | } | |
1348 | ||
1349 | /** | |
1350 | * ifx_spi_init - module entry point | |
1351 | * | |
1352 | * Initialise the SPI and tty interfaces for the IFX SPI driver | |
1353 | * We need to initialize upper-edge spi driver after the tty | |
1354 | * driver because otherwise the spi probe will race | |
1355 | */ | |
1356 | ||
1357 | static int __init ifx_spi_init(void) | |
1358 | { | |
1359 | int result; | |
1360 | ||
1361 | tty_drv = alloc_tty_driver(1); | |
1362 | if (!tty_drv) { | |
1363 | pr_err("%s: alloc_tty_driver failed", DRVNAME); | |
1364 | return -ENOMEM; | |
1365 | } | |
1366 | ||
1367 | tty_drv->magic = TTY_DRIVER_MAGIC; | |
1368 | tty_drv->owner = THIS_MODULE; | |
1369 | tty_drv->driver_name = DRVNAME; | |
1370 | tty_drv->name = TTYNAME; | |
1371 | tty_drv->minor_start = IFX_SPI_TTY_ID; | |
1372 | tty_drv->num = 1; | |
1373 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1374 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1375 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1376 | tty_drv->init_termios = tty_std_termios; | |
1377 | ||
1378 | tty_set_operations(tty_drv, &ifx_spi_serial_ops); | |
1379 | ||
1380 | result = tty_register_driver(tty_drv); | |
1381 | if (result) { | |
1382 | pr_err("%s: tty_register_driver failed(%d)", | |
1383 | DRVNAME, result); | |
1384 | return result; | |
1385 | } | |
1386 | ||
1387 | result = spi_register_driver((void *)&ifx_spi_driver_6160); | |
1388 | if (result) { | |
1389 | pr_err("%s: spi_register_driver failed(%d)", | |
1390 | DRVNAME, result); | |
1391 | tty_unregister_driver(tty_drv); | |
1392 | } | |
1393 | return result; | |
1394 | } | |
1395 | ||
1396 | module_init(ifx_spi_init); | |
1397 | module_exit(ifx_spi_exit); | |
1398 | ||
1399 | MODULE_AUTHOR("Intel"); | |
1400 | MODULE_DESCRIPTION("IFX6x60 spi driver"); | |
1401 | MODULE_LICENSE("GPL"); | |
1402 | MODULE_INFO(Version, "0.1-IFX6x60"); |