blob: 4d26d39ec3441ee97d770fc1a7e60593cd78b8d0 [file] [log] [blame]
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001/****************************************************************************
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
Russ Gorby2f1522e2011-02-02 12:56:58 -080011 * Russ Gorby <russ.gorby@intel.com>
Russ Gorbyaf3b8882010-10-26 14:13:52 +010012 *
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>
Alan Cox83abd0d2010-11-12 10:46:23 +000063#include <linux/delay.h>
Russ Gorbyaf3b8882010-10-26 14:13:52 +010064
65#include "ifx6x60.h"
66
67#define IFX_SPI_MORE_MASK 0x10
68#define IFX_SPI_MORE_BIT 12 /* bit position in u16 */
69#define IFX_SPI_CTS_BIT 13 /* bit position in u16 */
Russ Gorby2aff8d92011-02-07 12:02:31 -080070#define IFX_SPI_MODE SPI_MODE_1
Russ Gorbyaf3b8882010-10-26 14:13:52 +010071#define IFX_SPI_TTY_ID 0
72#define IFX_SPI_TIMEOUT_SEC 2
73#define IFX_SPI_HEADER_0 (-1)
74#define IFX_SPI_HEADER_F (-2)
75
76/* forward reference */
77static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
78
79/* local variables */
Russ Gorbyf0891402011-02-07 12:02:29 -080080static int spi_bpw = 16; /* 8, 16 or 32 bit word length */
Russ Gorbyaf3b8882010-10-26 14:13:52 +010081static struct tty_driver *tty_drv;
82static struct ifx_spi_device *saved_ifx_dev;
83static struct lock_class_key ifx_spi_key;
84
85/* GPIO/GPE settings */
86
87/**
88 * mrdy_set_high - set MRDY GPIO
89 * @ifx: device we are controlling
90 *
91 */
92static inline void mrdy_set_high(struct ifx_spi_device *ifx)
93{
94 gpio_set_value(ifx->gpio.mrdy, 1);
95}
96
97/**
98 * mrdy_set_low - clear MRDY GPIO
99 * @ifx: device we are controlling
100 *
101 */
102static inline void mrdy_set_low(struct ifx_spi_device *ifx)
103{
104 gpio_set_value(ifx->gpio.mrdy, 0);
105}
106
107/**
108 * ifx_spi_power_state_set
109 * @ifx_dev: our SPI device
110 * @val: bits to set
111 *
112 * Set bit in power status and signal power system if status becomes non-0
113 */
114static void
115ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
116{
117 unsigned long flags;
118
119 spin_lock_irqsave(&ifx_dev->power_lock, flags);
120
121 /*
122 * if power status is already non-0, just update, else
123 * tell power system
124 */
125 if (!ifx_dev->power_status)
126 pm_runtime_get(&ifx_dev->spi_dev->dev);
127 ifx_dev->power_status |= val;
128
129 spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
130}
131
132/**
133 * ifx_spi_power_state_clear - clear power bit
134 * @ifx_dev: our SPI device
135 * @val: bits to clear
136 *
137 * clear bit in power status and signal power system if status becomes 0
138 */
139static void
140ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
141{
142 unsigned long flags;
143
144 spin_lock_irqsave(&ifx_dev->power_lock, flags);
145
146 if (ifx_dev->power_status) {
147 ifx_dev->power_status &= ~val;
148 if (!ifx_dev->power_status)
149 pm_runtime_put(&ifx_dev->spi_dev->dev);
150 }
151
152 spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
153}
154
155/**
156 * swap_buf
157 * @buf: our buffer
158 * @len : number of bytes (not words) in the buffer
159 * @end: end of buffer
160 *
161 * Swap the contents of a buffer into big endian format
162 */
163static inline void swap_buf(u16 *buf, int len, void *end)
164{
165 int n;
166
167 len = ((len + 1) >> 1);
168 if ((void *)&buf[len] > end) {
169 pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
170 &buf[len], end);
171 return;
172 }
173 for (n = 0; n < len; n++) {
174 *buf = cpu_to_be16(*buf);
175 buf++;
176 }
177}
178
179/**
180 * mrdy_assert - assert MRDY line
181 * @ifx_dev: our SPI device
182 *
183 * Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
184 * now.
185 *
186 * FIXME: Can SRDY even go high as we are running this code ?
187 */
188static void mrdy_assert(struct ifx_spi_device *ifx_dev)
189{
190 int val = gpio_get_value(ifx_dev->gpio.srdy);
191 if (!val) {
192 if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
193 &ifx_dev->flags)) {
194 ifx_dev->spi_timer.expires =
195 jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
196 add_timer(&ifx_dev->spi_timer);
197
198 }
199 }
200 ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
201 mrdy_set_high(ifx_dev);
202}
203
204/**
205 * ifx_spi_hangup - hang up an IFX device
206 * @ifx_dev: our SPI device
207 *
208 * Hang up the tty attached to the IFX device if one is currently
209 * open. If not take no action
210 */
211static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
212{
213 struct tty_port *pport = &ifx_dev->tty_port;
214 struct tty_struct *tty = tty_port_tty_get(pport);
215 if (tty) {
216 tty_hangup(tty);
217 tty_kref_put(tty);
218 }
219}
220
221/**
222 * ifx_spi_timeout - SPI timeout
223 * @arg: our SPI device
224 *
225 * The SPI has timed out: hang up the tty. Users will then see a hangup
226 * and error events.
227 */
228static void ifx_spi_timeout(unsigned long arg)
229{
230 struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
231
232 dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
233 ifx_spi_ttyhangup(ifx_dev);
234 mrdy_set_low(ifx_dev);
235 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
236}
237
238/* char/tty operations */
239
240/**
241 * ifx_spi_tiocmget - get modem lines
242 * @tty: our tty device
243 * @filp: file handle issuing the request
244 *
245 * Map the signal state into Linux modem flags and report the value
246 * in Linux terms
247 */
Alan Cox60b33c12011-02-14 16:26:14 +0000248static int ifx_spi_tiocmget(struct tty_struct *tty)
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100249{
250 unsigned int value;
251 struct ifx_spi_device *ifx_dev = tty->driver_data;
252
253 value =
254 (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
255 (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
256 (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
257 (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
258 (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
259 (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
260 return value;
261}
262
263/**
264 * ifx_spi_tiocmset - set modem bits
265 * @tty: the tty structure
266 * @filp: file handle issuing the request
267 * @set: bits to set
268 * @clear: bits to clear
269 *
270 * The IFX6x60 only supports DTR and RTS. Set them accordingly
271 * and flag that an update to the modem is needed.
272 *
273 * FIXME: do we need to kick the tranfers when we do this ?
274 */
275static int ifx_spi_tiocmset(struct tty_struct *tty, struct file *filp,
276 unsigned int set, unsigned int clear)
277{
278 struct ifx_spi_device *ifx_dev = tty->driver_data;
279
280 if (set & TIOCM_RTS)
281 set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
282 if (set & TIOCM_DTR)
283 set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
284 if (clear & TIOCM_RTS)
285 clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
286 if (clear & TIOCM_DTR)
287 clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
288
289 set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
290 return 0;
291}
292
293/**
294 * ifx_spi_open - called on tty open
295 * @tty: our tty device
296 * @filp: file handle being associated with the tty
297 *
298 * Open the tty interface. We let the tty_port layer do all the work
299 * for us.
300 *
301 * FIXME: Remove single device assumption and saved_ifx_dev
302 */
303static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
304{
305 return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
306}
307
308/**
309 * ifx_spi_close - called when our tty closes
310 * @tty: the tty being closed
311 * @filp: the file handle being closed
312 *
313 * Perform the close of the tty. We use the tty_port layer to do all
314 * our hard work.
315 */
316static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
317{
318 struct ifx_spi_device *ifx_dev = tty->driver_data;
319 tty_port_close(&ifx_dev->tty_port, tty, filp);
320 /* FIXME: should we do an ifx_spi_reset here ? */
321}
322
323/**
324 * ifx_decode_spi_header - decode received header
325 * @buffer: the received data
326 * @length: decoded length
327 * @more: decoded more flag
328 * @received_cts: status of cts we received
329 *
330 * Note how received_cts is handled -- if header is all F it is left
331 * the same as it was, if header is all 0 it is set to 0 otherwise it is
332 * taken from the incoming header.
333 *
334 * FIXME: endianness
335 */
336static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
337 unsigned char *more, unsigned char *received_cts)
338{
339 u16 h1;
340 u16 h2;
341 u16 *in_buffer = (u16 *)buffer;
342
343 h1 = *in_buffer;
344 h2 = *(in_buffer+1);
345
346 if (h1 == 0 && h2 == 0) {
347 *received_cts = 0;
348 return IFX_SPI_HEADER_0;
349 } else if (h1 == 0xffff && h2 == 0xffff) {
350 /* spi_slave_cts remains as it was */
351 return IFX_SPI_HEADER_F;
352 }
353
354 *length = h1 & 0xfff; /* upper bits of byte are flags */
355 *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
356 *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
357 return 0;
358}
359
360/**
361 * ifx_setup_spi_header - set header fields
362 * @txbuffer: pointer to start of SPI buffer
363 * @tx_count: bytes
364 * @more: indicate if more to follow
365 *
366 * Format up an SPI header for a transfer
367 *
368 * FIXME: endianness?
369 */
370static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
371 unsigned char more)
372{
373 *(u16 *)(txbuffer) = tx_count;
374 *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
375 txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
376}
377
378/**
379 * ifx_spi_wakeup_serial - SPI space made
380 * @port_data: our SPI device
381 *
382 * We have emptied the FIFO enough that we want to get more data
383 * queued into it. Poke the line discipline via tty_wakeup so that
384 * it will feed us more bits
385 */
386static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
387{
388 struct tty_struct *tty;
389
390 tty = tty_port_tty_get(&ifx_dev->tty_port);
391 if (!tty)
392 return;
393 tty_wakeup(tty);
394 tty_kref_put(tty);
395}
396
397/**
398 * ifx_spi_prepare_tx_buffer - prepare transmit frame
399 * @ifx_dev: our SPI device
400 *
401 * The transmit buffr needs a header and various other bits of
402 * information followed by as much data as we can pull from the FIFO
403 * and transfer. This function formats up a suitable buffer in the
404 * ifx_dev->tx_buffer
405 *
406 * FIXME: performance - should we wake the tty when the queue is half
407 * empty ?
408 */
409static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
410{
411 int temp_count;
412 int queue_length;
413 int tx_count;
414 unsigned char *tx_buffer;
415
416 tx_buffer = ifx_dev->tx_buffer;
417 memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
418
419 /* make room for required SPI header */
420 tx_buffer += IFX_SPI_HEADER_OVERHEAD;
421 tx_count = IFX_SPI_HEADER_OVERHEAD;
422
423 /* clear to signal no more data if this turns out to be the
424 * last buffer sent in a sequence */
425 ifx_dev->spi_more = 0;
426
427 /* if modem cts is set, just send empty buffer */
428 if (!ifx_dev->spi_slave_cts) {
429 /* see if there's tx data */
430 queue_length = kfifo_len(&ifx_dev->tx_fifo);
431 if (queue_length != 0) {
432 /* data to mux -- see if there's room for it */
433 temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
434 temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
435 tx_buffer, temp_count,
436 &ifx_dev->fifo_lock);
437
438 /* update buffer pointer and data count in message */
439 tx_buffer += temp_count;
440 tx_count += temp_count;
441 if (temp_count == queue_length)
442 /* poke port to get more data */
443 ifx_spi_wakeup_serial(ifx_dev);
444 else /* more data in port, use next SPI message */
445 ifx_dev->spi_more = 1;
446 }
447 }
448 /* have data and info for header -- set up SPI header in buffer */
449 /* spi header needs payload size, not entire buffer size */
450 ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
451 tx_count-IFX_SPI_HEADER_OVERHEAD,
452 ifx_dev->spi_more);
453 /* swap actual data in the buffer */
454 swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
455 &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
456 return tx_count;
457}
458
459/**
460 * ifx_spi_write - line discipline write
461 * @tty: our tty device
462 * @buf: pointer to buffer to write (kernel space)
463 * @count: size of buffer
464 *
465 * Write the characters we have been given into the FIFO. If the device
466 * is not active then activate it, when the SRDY line is asserted back
467 * this will commence I/O
468 */
469static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
470 int count)
471{
472 struct ifx_spi_device *ifx_dev = tty->driver_data;
473 unsigned char *tmp_buf = (unsigned char *)buf;
474 int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
475 &ifx_dev->fifo_lock);
476 mrdy_assert(ifx_dev);
477 return tx_count;
478}
479
480/**
481 * ifx_spi_chars_in_buffer - line discipline helper
482 * @tty: our tty device
483 *
484 * Report how much data we can accept before we drop bytes. As we use
485 * a simple FIFO this is nice and easy.
486 */
487static int ifx_spi_write_room(struct tty_struct *tty)
488{
489 struct ifx_spi_device *ifx_dev = tty->driver_data;
490 return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
491}
492
493/**
494 * ifx_spi_chars_in_buffer - line discipline helper
495 * @tty: our tty device
496 *
497 * Report how many characters we have buffered. In our case this is the
498 * number of bytes sitting in our transmit FIFO.
499 */
500static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
501{
502 struct ifx_spi_device *ifx_dev = tty->driver_data;
503 return kfifo_len(&ifx_dev->tx_fifo);
504}
505
506/**
507 * ifx_port_hangup
508 * @port: our tty port
509 *
510 * tty port hang up. Called when tty_hangup processing is invoked either
511 * by loss of carrier, or by software (eg vhangup). Serialized against
512 * activate/shutdown by the tty layer.
513 */
514static void ifx_spi_hangup(struct tty_struct *tty)
515{
516 struct ifx_spi_device *ifx_dev = tty->driver_data;
517 tty_port_hangup(&ifx_dev->tty_port);
518}
519
520/**
521 * ifx_port_activate
522 * @port: our tty port
523 *
524 * tty port activate method - called for first open. Serialized
525 * with hangup and shutdown by the tty layer.
526 */
527static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
528{
529 struct ifx_spi_device *ifx_dev =
530 container_of(port, struct ifx_spi_device, tty_port);
531
532 /* clear any old data; can't do this in 'close' */
533 kfifo_reset(&ifx_dev->tx_fifo);
534
535 /* put port data into this tty */
536 tty->driver_data = ifx_dev;
537
538 /* allows flip string push from int context */
539 tty->low_latency = 1;
540
541 return 0;
542}
543
544/**
545 * ifx_port_shutdown
546 * @port: our tty port
547 *
548 * tty port shutdown method - called for last port close. Serialized
549 * with hangup and activate by the tty layer.
550 */
551static void ifx_port_shutdown(struct tty_port *port)
552{
553 struct ifx_spi_device *ifx_dev =
554 container_of(port, struct ifx_spi_device, tty_port);
555
556 mrdy_set_low(ifx_dev);
557 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
558 tasklet_kill(&ifx_dev->io_work_tasklet);
559}
560
561static const struct tty_port_operations ifx_tty_port_ops = {
562 .activate = ifx_port_activate,
563 .shutdown = ifx_port_shutdown,
564};
565
566static const struct tty_operations ifx_spi_serial_ops = {
567 .open = ifx_spi_open,
568 .close = ifx_spi_close,
569 .write = ifx_spi_write,
570 .hangup = ifx_spi_hangup,
571 .write_room = ifx_spi_write_room,
572 .chars_in_buffer = ifx_spi_chars_in_buffer,
573 .tiocmget = ifx_spi_tiocmget,
574 .tiocmset = ifx_spi_tiocmset,
575};
576
577/**
578 * ifx_spi_insert_fip_string - queue received data
579 * @ifx_ser: our SPI device
580 * @chars: buffer we have received
581 * @size: number of chars reeived
582 *
583 * Queue bytes to the tty assuming the tty side is currently open. If
584 * not the discard the data.
585 */
586static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
587 unsigned char *chars, size_t size)
588{
589 struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
590 if (!tty)
591 return;
592 tty_insert_flip_string(tty, chars, size);
593 tty_flip_buffer_push(tty);
594 tty_kref_put(tty);
595}
596
597/**
598 * ifx_spi_complete - SPI transfer completed
599 * @ctx: our SPI device
600 *
601 * An SPI transfer has completed. Process any received data and kick off
602 * any further transmits we can commence.
603 */
604static void ifx_spi_complete(void *ctx)
605{
606 struct ifx_spi_device *ifx_dev = ctx;
607 struct tty_struct *tty;
608 struct tty_ldisc *ldisc = NULL;
609 int length;
610 int actual_length;
611 unsigned char more;
612 unsigned char cts;
613 int local_write_pending = 0;
614 int queue_length;
615 int srdy;
616 int decode_result;
617
618 mrdy_set_low(ifx_dev);
619
620 if (!ifx_dev->spi_msg.status) {
621 /* check header validity, get comm flags */
622 swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
623 &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
624 decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
625 &length, &more, &cts);
626 if (decode_result == IFX_SPI_HEADER_0) {
627 dev_dbg(&ifx_dev->spi_dev->dev,
628 "ignore input: invalid header 0");
629 ifx_dev->spi_slave_cts = 0;
630 goto complete_exit;
631 } else if (decode_result == IFX_SPI_HEADER_F) {
632 dev_dbg(&ifx_dev->spi_dev->dev,
633 "ignore input: invalid header F");
634 goto complete_exit;
635 }
636
637 ifx_dev->spi_slave_cts = cts;
638
639 actual_length = min((unsigned int)length,
640 ifx_dev->spi_msg.actual_length);
641 swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
642 actual_length,
643 &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
644 ifx_spi_insert_flip_string(
645 ifx_dev,
646 ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
647 (size_t)actual_length);
648 } else {
649 dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
650 ifx_dev->spi_msg.status);
651 }
652
653complete_exit:
654 if (ifx_dev->write_pending) {
655 ifx_dev->write_pending = 0;
656 local_write_pending = 1;
657 }
658
659 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
660
661 queue_length = kfifo_len(&ifx_dev->tx_fifo);
662 srdy = gpio_get_value(ifx_dev->gpio.srdy);
663 if (!srdy)
664 ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
665
666 /* schedule output if there is more to do */
667 if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
668 tasklet_schedule(&ifx_dev->io_work_tasklet);
669 else {
670 if (more || ifx_dev->spi_more || queue_length > 0 ||
671 local_write_pending) {
672 if (ifx_dev->spi_slave_cts) {
673 if (more)
674 mrdy_assert(ifx_dev);
675 } else
676 mrdy_assert(ifx_dev);
677 } else {
678 /*
679 * poke line discipline driver if any for more data
680 * may or may not get more data to write
681 * for now, say not busy
682 */
683 ifx_spi_power_state_clear(ifx_dev,
684 IFX_SPI_POWER_DATA_PENDING);
685 tty = tty_port_tty_get(&ifx_dev->tty_port);
686 if (tty) {
687 ldisc = tty_ldisc_ref(tty);
688 if (ldisc) {
689 ldisc->ops->write_wakeup(tty);
690 tty_ldisc_deref(ldisc);
691 }
692 tty_kref_put(tty);
693 }
694 }
695 }
696}
697
698/**
699 * ifx_spio_io - I/O tasklet
700 * @data: our SPI device
701 *
702 * Queue data for transmission if possible and then kick off the
703 * transfer.
704 */
705static void ifx_spi_io(unsigned long data)
706{
707 int retval;
708 struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
709
710 if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
711 if (ifx_dev->gpio.unack_srdy_int_nb > 0)
712 ifx_dev->gpio.unack_srdy_int_nb--;
713
714 ifx_spi_prepare_tx_buffer(ifx_dev);
715
716 spi_message_init(&ifx_dev->spi_msg);
717 INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
718
719 ifx_dev->spi_msg.context = ifx_dev;
720 ifx_dev->spi_msg.complete = ifx_spi_complete;
721
722 /* set up our spi transfer */
723 /* note len is BYTES, not transfers */
724 ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
725 ifx_dev->spi_xfer.cs_change = 0;
Russ Gorby1b79b442011-02-07 12:02:30 -0800726 ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100727 /* ifx_dev->spi_xfer.speed_hz = 390625; */
Russ Gorbyf0891402011-02-07 12:02:29 -0800728 ifx_dev->spi_xfer.bits_per_word = spi_bpw;
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100729
730 ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
731 ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
732
733 /*
734 * setup dma pointers
735 */
Russ Gorby2f1522e2011-02-02 12:56:58 -0800736 if (ifx_dev->use_dma) {
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100737 ifx_dev->spi_msg.is_dma_mapped = 1;
738 ifx_dev->tx_dma = ifx_dev->tx_bus;
739 ifx_dev->rx_dma = ifx_dev->rx_bus;
740 ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
741 ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
742 } else {
743 ifx_dev->spi_msg.is_dma_mapped = 0;
744 ifx_dev->tx_dma = (dma_addr_t)0;
745 ifx_dev->rx_dma = (dma_addr_t)0;
746 ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
747 ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
748 }
749
750 spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
751
752 /* Assert MRDY. This may have already been done by the write
753 * routine.
754 */
755 mrdy_assert(ifx_dev);
756
757 retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
758 if (retval) {
759 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
760 &ifx_dev->flags);
761 tasklet_schedule(&ifx_dev->io_work_tasklet);
762 return;
763 }
764 } else
765 ifx_dev->write_pending = 1;
766}
767
768/**
769 * ifx_spi_free_port - free up the tty side
770 * @ifx_dev: IFX device going away
771 *
772 * Unregister and free up a port when the device goes away
773 */
774static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
775{
776 if (ifx_dev->tty_dev)
777 tty_unregister_device(tty_drv, ifx_dev->minor);
778 kfifo_free(&ifx_dev->tx_fifo);
779}
780
781/**
782 * ifx_spi_create_port - create a new port
783 * @ifx_dev: our spi device
784 *
785 * Allocate and initialise the tty port that goes with this interface
786 * and add it to the tty layer so that it can be opened.
787 */
788static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
789{
790 int ret = 0;
791 struct tty_port *pport = &ifx_dev->tty_port;
792
793 spin_lock_init(&ifx_dev->fifo_lock);
794 lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
795 &ifx_spi_key, 0);
796
797 if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
798 ret = -ENOMEM;
799 goto error_ret;
800 }
801
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100802 tty_port_init(pport);
Russ Gorbyb68f23b2011-02-07 12:02:27 -0800803 pport->ops = &ifx_tty_port_ops;
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100804 ifx_dev->minor = IFX_SPI_TTY_ID;
805 ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
806 &ifx_dev->spi_dev->dev);
807 if (IS_ERR(ifx_dev->tty_dev)) {
808 dev_dbg(&ifx_dev->spi_dev->dev,
809 "%s: registering tty device failed", __func__);
810 ret = PTR_ERR(ifx_dev->tty_dev);
811 goto error_ret;
812 }
813 return 0;
814
815error_ret:
816 ifx_spi_free_port(ifx_dev);
817 return ret;
818}
819
820/**
821 * ifx_spi_handle_srdy - handle SRDY
822 * @ifx_dev: device asserting SRDY
823 *
824 * Check our device state and see what we need to kick off when SRDY
825 * is asserted. This usually means killing the timer and firing off the
826 * I/O processing.
827 */
828static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
829{
830 if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
831 del_timer_sync(&ifx_dev->spi_timer);
832 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
833 }
834
835 ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
836
837 if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
838 tasklet_schedule(&ifx_dev->io_work_tasklet);
839 else
840 set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
841}
842
843/**
844 * ifx_spi_srdy_interrupt - SRDY asserted
845 * @irq: our IRQ number
846 * @dev: our ifx device
847 *
848 * The modem asserted SRDY. Handle the srdy event
849 */
850static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
851{
852 struct ifx_spi_device *ifx_dev = dev;
853 ifx_dev->gpio.unack_srdy_int_nb++;
854 ifx_spi_handle_srdy(ifx_dev);
855 return IRQ_HANDLED;
856}
857
858/**
859 * ifx_spi_reset_interrupt - Modem has changed reset state
860 * @irq: interrupt number
861 * @dev: our device pointer
862 *
863 * The modem has either entered or left reset state. Check the GPIO
864 * line to see which.
865 *
866 * FIXME: review locking on MR_INPROGRESS versus
867 * parallel unsolicited reset/solicited reset
868 */
869static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
870{
871 struct ifx_spi_device *ifx_dev = dev;
872 int val = gpio_get_value(ifx_dev->gpio.reset_out);
873 int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
874
875 if (val == 0) {
876 /* entered reset */
877 set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
878 if (!solreset) {
879 /* unsolicited reset */
880 ifx_spi_ttyhangup(ifx_dev);
881 }
882 } else {
883 /* exited reset */
884 clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
885 if (solreset) {
886 set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
887 wake_up(&ifx_dev->mdm_reset_wait);
888 }
889 }
890 return IRQ_HANDLED;
891}
892
893/**
894 * ifx_spi_free_device - free device
895 * @ifx_dev: device to free
896 *
897 * Free the IFX device
898 */
899static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
900{
901 ifx_spi_free_port(ifx_dev);
902 dma_free_coherent(&ifx_dev->spi_dev->dev,
903 IFX_SPI_TRANSFER_SIZE,
904 ifx_dev->tx_buffer,
905 ifx_dev->tx_bus);
906 dma_free_coherent(&ifx_dev->spi_dev->dev,
907 IFX_SPI_TRANSFER_SIZE,
908 ifx_dev->rx_buffer,
909 ifx_dev->rx_bus);
910}
911
912/**
913 * ifx_spi_reset - reset modem
914 * @ifx_dev: modem to reset
915 *
916 * Perform a reset on the modem
917 */
918static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
919{
920 int ret;
921 /*
922 * set up modem power, reset
923 *
924 * delays are required on some platforms for the modem
925 * to reset properly
926 */
927 set_bit(MR_START, &ifx_dev->mdm_reset_state);
928 gpio_set_value(ifx_dev->gpio.po, 0);
929 gpio_set_value(ifx_dev->gpio.reset, 0);
930 msleep(25);
931 gpio_set_value(ifx_dev->gpio.reset, 1);
932 msleep(1);
933 gpio_set_value(ifx_dev->gpio.po, 1);
934 msleep(1);
935 gpio_set_value(ifx_dev->gpio.po, 0);
936 ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
937 test_bit(MR_COMPLETE,
938 &ifx_dev->mdm_reset_state),
939 IFX_RESET_TIMEOUT);
940 if (!ret)
941 dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
942 ifx_dev->mdm_reset_state);
943
944 ifx_dev->mdm_reset_state = 0;
945 return ret;
946}
947
948/**
949 * ifx_spi_spi_probe - probe callback
950 * @spi: our possible matching SPI device
951 *
952 * Probe for a 6x60 modem on SPI bus. Perform any needed device and
953 * GPIO setup.
954 *
955 * FIXME:
956 * - Support for multiple devices
957 * - Split out MID specific GPIO handling eventually
958 */
959
960static int ifx_spi_spi_probe(struct spi_device *spi)
961{
962 int ret;
963 int srdy;
Russ Gorby2f1522e2011-02-02 12:56:58 -0800964 struct ifx_modem_platform_data *pl_data;
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100965 struct ifx_spi_device *ifx_dev;
966
967 if (saved_ifx_dev) {
968 dev_dbg(&spi->dev, "ignoring subsequent detection");
969 return -ENODEV;
970 }
971
Russ Gorby2f1522e2011-02-02 12:56:58 -0800972 pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
973 if (!pl_data) {
974 dev_err(&spi->dev, "missing platform data!");
975 return -ENODEV;
976 }
977
Russ Gorbyaf3b8882010-10-26 14:13:52 +0100978 /* initialize structure to hold our device variables */
979 ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
980 if (!ifx_dev) {
981 dev_err(&spi->dev, "spi device allocation failed");
982 return -ENOMEM;
983 }
984 saved_ifx_dev = ifx_dev;
985 ifx_dev->spi_dev = spi;
986 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
987 spin_lock_init(&ifx_dev->write_lock);
988 spin_lock_init(&ifx_dev->power_lock);
989 ifx_dev->power_status = 0;
990 init_timer(&ifx_dev->spi_timer);
991 ifx_dev->spi_timer.function = ifx_spi_timeout;
992 ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
Russ Gorby2f1522e2011-02-02 12:56:58 -0800993 ifx_dev->modem = pl_data->modem_type;
994 ifx_dev->use_dma = pl_data->use_dma;
995 ifx_dev->max_hz = pl_data->max_hz;
Russ Gorby2aff8d92011-02-07 12:02:31 -0800996 /* initialize spi mode, etc */
Russ Gorby1b79b442011-02-07 12:02:30 -0800997 spi->max_speed_hz = ifx_dev->max_hz;
Russ Gorby2aff8d92011-02-07 12:02:31 -0800998 spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode);
999 spi->bits_per_word = spi_bpw;
1000 ret = spi_setup(spi);
1001 if (ret) {
1002 dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);
1003 return -ENODEV;
1004 }
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001005
1006 /* ensure SPI protocol flags are initialized to enable transfer */
1007 ifx_dev->spi_more = 0;
1008 ifx_dev->spi_slave_cts = 0;
1009
1010 /*initialize transfer and dma buffers */
Russ Gorby5fc324952011-02-07 12:02:28 -08001011 ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001012 IFX_SPI_TRANSFER_SIZE,
1013 &ifx_dev->tx_bus,
1014 GFP_KERNEL);
1015 if (!ifx_dev->tx_buffer) {
1016 dev_err(&spi->dev, "DMA-TX buffer allocation failed");
1017 ret = -ENOMEM;
1018 goto error_ret;
1019 }
Russ Gorby5fc324952011-02-07 12:02:28 -08001020 ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001021 IFX_SPI_TRANSFER_SIZE,
1022 &ifx_dev->rx_bus,
1023 GFP_KERNEL);
1024 if (!ifx_dev->rx_buffer) {
1025 dev_err(&spi->dev, "DMA-RX buffer allocation failed");
1026 ret = -ENOMEM;
1027 goto error_ret;
1028 }
1029
1030 /* initialize waitq for modem reset */
1031 init_waitqueue_head(&ifx_dev->mdm_reset_wait);
1032
1033 spi_set_drvdata(spi, ifx_dev);
1034 tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
1035 (unsigned long)ifx_dev);
1036
1037 set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
1038
1039 /* create our tty port */
1040 ret = ifx_spi_create_port(ifx_dev);
1041 if (ret != 0) {
1042 dev_err(&spi->dev, "create default tty port failed");
1043 goto error_ret;
1044 }
1045
Russ Gorby2f1522e2011-02-02 12:56:58 -08001046 ifx_dev->gpio.reset = pl_data->rst_pmu;
1047 ifx_dev->gpio.po = pl_data->pwr_on;
1048 ifx_dev->gpio.mrdy = pl_data->mrdy;
1049 ifx_dev->gpio.srdy = pl_data->srdy;
1050 ifx_dev->gpio.reset_out = pl_data->rst_out;
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001051
1052 dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
1053 ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
1054 ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
1055
1056 /* Configure gpios */
1057 ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
1058 if (ret < 0) {
1059 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
1060 ifx_dev->gpio.reset);
1061 goto error_ret;
1062 }
1063 ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
1064 ret += gpio_export(ifx_dev->gpio.reset, 1);
1065 if (ret) {
1066 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
1067 ifx_dev->gpio.reset);
1068 ret = -EBUSY;
1069 goto error_ret2;
1070 }
1071
1072 ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
1073 ret += gpio_direction_output(ifx_dev->gpio.po, 0);
1074 ret += gpio_export(ifx_dev->gpio.po, 1);
1075 if (ret) {
1076 dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
1077 ifx_dev->gpio.po);
1078 ret = -EBUSY;
1079 goto error_ret3;
1080 }
1081
1082 ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
1083 if (ret < 0) {
1084 dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
1085 ifx_dev->gpio.mrdy);
1086 goto error_ret3;
1087 }
1088 ret += gpio_export(ifx_dev->gpio.mrdy, 1);
1089 ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
1090 if (ret) {
1091 dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
1092 ifx_dev->gpio.mrdy);
1093 ret = -EBUSY;
1094 goto error_ret4;
1095 }
1096
1097 ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
1098 if (ret < 0) {
1099 dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
1100 ifx_dev->gpio.srdy);
1101 ret = -EBUSY;
1102 goto error_ret4;
1103 }
1104 ret += gpio_export(ifx_dev->gpio.srdy, 1);
1105 ret += gpio_direction_input(ifx_dev->gpio.srdy);
1106 if (ret) {
1107 dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
1108 ifx_dev->gpio.srdy);
1109 ret = -EBUSY;
1110 goto error_ret5;
1111 }
1112
1113 ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
1114 if (ret < 0) {
1115 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
1116 ifx_dev->gpio.reset_out);
1117 goto error_ret5;
1118 }
1119 ret += gpio_export(ifx_dev->gpio.reset_out, 1);
1120 ret += gpio_direction_input(ifx_dev->gpio.reset_out);
1121 if (ret) {
1122 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
1123 ifx_dev->gpio.reset_out);
1124 ret = -EBUSY;
1125 goto error_ret6;
1126 }
1127
1128 ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
1129 ifx_spi_reset_interrupt,
1130 IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
1131 (void *)ifx_dev);
1132 if (ret) {
1133 dev_err(&spi->dev, "Unable to get irq %x\n",
1134 gpio_to_irq(ifx_dev->gpio.reset_out));
1135 goto error_ret6;
1136 }
1137
1138 ret = ifx_spi_reset(ifx_dev);
1139
1140 ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
1141 ifx_spi_srdy_interrupt,
1142 IRQF_TRIGGER_RISING, DRVNAME,
1143 (void *)ifx_dev);
1144 if (ret) {
1145 dev_err(&spi->dev, "Unable to get irq %x",
1146 gpio_to_irq(ifx_dev->gpio.srdy));
Vasiliy Kulikovbadb9532010-11-19 21:42:03 +03001147 goto error_ret7;
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001148 }
1149
1150 /* set pm runtime power state and register with power system */
1151 pm_runtime_set_active(&spi->dev);
1152 pm_runtime_enable(&spi->dev);
1153
1154 /* handle case that modem is already signaling SRDY */
1155 /* no outgoing tty open at this point, this just satisfies the
1156 * modem's read and should reset communication properly
1157 */
1158 srdy = gpio_get_value(ifx_dev->gpio.srdy);
1159
1160 if (srdy) {
1161 mrdy_assert(ifx_dev);
1162 ifx_spi_handle_srdy(ifx_dev);
1163 } else
1164 mrdy_set_low(ifx_dev);
1165 return 0;
1166
Vasiliy Kulikovbadb9532010-11-19 21:42:03 +03001167error_ret7:
1168 free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001169error_ret6:
1170 gpio_free(ifx_dev->gpio.srdy);
1171error_ret5:
1172 gpio_free(ifx_dev->gpio.mrdy);
1173error_ret4:
1174 gpio_free(ifx_dev->gpio.reset);
1175error_ret3:
1176 gpio_free(ifx_dev->gpio.po);
1177error_ret2:
1178 gpio_free(ifx_dev->gpio.reset_out);
1179error_ret:
1180 ifx_spi_free_device(ifx_dev);
1181 saved_ifx_dev = NULL;
1182 return ret;
1183}
1184
1185/**
1186 * ifx_spi_spi_remove - SPI device was removed
1187 * @spi: SPI device
1188 *
1189 * FIXME: We should be shutting the device down here not in
1190 * the module unload path.
1191 */
1192
1193static int ifx_spi_spi_remove(struct spi_device *spi)
1194{
1195 struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1196 /* stop activity */
1197 tasklet_kill(&ifx_dev->io_work_tasklet);
1198 /* free irq */
1199 free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1200 free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
1201
1202 gpio_free(ifx_dev->gpio.srdy);
1203 gpio_free(ifx_dev->gpio.mrdy);
1204 gpio_free(ifx_dev->gpio.reset);
1205 gpio_free(ifx_dev->gpio.po);
1206 gpio_free(ifx_dev->gpio.reset_out);
1207
1208 /* free allocations */
1209 ifx_spi_free_device(ifx_dev);
1210
1211 saved_ifx_dev = NULL;
1212 return 0;
1213}
1214
1215/**
1216 * ifx_spi_spi_shutdown - called on SPI shutdown
1217 * @spi: SPI device
1218 *
1219 * No action needs to be taken here
1220 */
1221
1222static void ifx_spi_spi_shutdown(struct spi_device *spi)
1223{
1224}
1225
1226/*
1227 * various suspends and resumes have nothing to do
1228 * no hardware to save state for
1229 */
1230
1231/**
1232 * ifx_spi_spi_suspend - suspend SPI on system suspend
1233 * @dev: device being suspended
1234 *
1235 * Suspend the SPI side. No action needed on Intel MID platforms, may
1236 * need extending for other systems.
1237 */
1238static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
1239{
1240 return 0;
1241}
1242
1243/**
1244 * ifx_spi_spi_resume - resume SPI side on system resume
1245 * @dev: device being suspended
1246 *
1247 * Suspend the SPI side. No action needed on Intel MID platforms, may
1248 * need extending for other systems.
1249 */
1250static int ifx_spi_spi_resume(struct spi_device *spi)
1251{
1252 return 0;
1253}
1254
1255/**
1256 * ifx_spi_pm_suspend - suspend modem on system suspend
1257 * @dev: device being suspended
1258 *
1259 * Suspend the modem. No action needed on Intel MID platforms, may
1260 * need extending for other systems.
1261 */
1262static int ifx_spi_pm_suspend(struct device *dev)
1263{
1264 return 0;
1265}
1266
1267/**
1268 * ifx_spi_pm_resume - resume modem on system resume
1269 * @dev: device being suspended
1270 *
1271 * Allow the modem to resume. No action needed.
1272 *
1273 * FIXME: do we need to reset anything here ?
1274 */
1275static int ifx_spi_pm_resume(struct device *dev)
1276{
1277 return 0;
1278}
1279
1280/**
1281 * ifx_spi_pm_runtime_resume - suspend modem
1282 * @dev: device being suspended
1283 *
1284 * Allow the modem to resume. No action needed.
1285 */
1286static int ifx_spi_pm_runtime_resume(struct device *dev)
1287{
1288 return 0;
1289}
1290
1291/**
1292 * ifx_spi_pm_runtime_suspend - suspend modem
1293 * @dev: device being suspended
1294 *
1295 * Allow the modem to suspend and thus suspend to continue up the
1296 * device tree.
1297 */
1298static int ifx_spi_pm_runtime_suspend(struct device *dev)
1299{
1300 return 0;
1301}
1302
1303/**
1304 * ifx_spi_pm_runtime_idle - check if modem idle
1305 * @dev: our device
1306 *
1307 * Check conditions and queue runtime suspend if idle.
1308 */
1309static int ifx_spi_pm_runtime_idle(struct device *dev)
1310{
1311 struct spi_device *spi = to_spi_device(dev);
1312 struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1313
1314 if (!ifx_dev->power_status)
1315 pm_runtime_suspend(dev);
1316
1317 return 0;
1318}
1319
1320static const struct dev_pm_ops ifx_spi_pm = {
1321 .resume = ifx_spi_pm_resume,
1322 .suspend = ifx_spi_pm_suspend,
1323 .runtime_resume = ifx_spi_pm_runtime_resume,
1324 .runtime_suspend = ifx_spi_pm_runtime_suspend,
1325 .runtime_idle = ifx_spi_pm_runtime_idle
1326};
1327
1328static const struct spi_device_id ifx_id_table[] = {
1329 {"ifx6160", 0},
1330 {"ifx6260", 0},
1331 { }
1332};
1333MODULE_DEVICE_TABLE(spi, ifx_id_table);
1334
1335/* spi operations */
Russ Gorby8115be02011-02-07 12:02:32 -08001336static const struct spi_driver ifx_spi_driver = {
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001337 .driver = {
Russ Gorby8115be02011-02-07 12:02:32 -08001338 .name = DRVNAME,
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001339 .bus = &spi_bus_type,
1340 .pm = &ifx_spi_pm,
1341 .owner = THIS_MODULE},
1342 .probe = ifx_spi_spi_probe,
1343 .shutdown = ifx_spi_spi_shutdown,
1344 .remove = __devexit_p(ifx_spi_spi_remove),
1345 .suspend = ifx_spi_spi_suspend,
1346 .resume = ifx_spi_spi_resume,
1347 .id_table = ifx_id_table
1348};
1349
1350/**
1351 * ifx_spi_exit - module exit
1352 *
1353 * Unload the module.
1354 */
1355
1356static void __exit ifx_spi_exit(void)
1357{
1358 /* unregister */
1359 tty_unregister_driver(tty_drv);
Russ Gorby8115be02011-02-07 12:02:32 -08001360 spi_unregister_driver((void *)&ifx_spi_driver);
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001361}
1362
1363/**
1364 * ifx_spi_init - module entry point
1365 *
1366 * Initialise the SPI and tty interfaces for the IFX SPI driver
1367 * We need to initialize upper-edge spi driver after the tty
1368 * driver because otherwise the spi probe will race
1369 */
1370
1371static int __init ifx_spi_init(void)
1372{
1373 int result;
1374
1375 tty_drv = alloc_tty_driver(1);
1376 if (!tty_drv) {
1377 pr_err("%s: alloc_tty_driver failed", DRVNAME);
1378 return -ENOMEM;
1379 }
1380
1381 tty_drv->magic = TTY_DRIVER_MAGIC;
1382 tty_drv->owner = THIS_MODULE;
1383 tty_drv->driver_name = DRVNAME;
1384 tty_drv->name = TTYNAME;
1385 tty_drv->minor_start = IFX_SPI_TTY_ID;
1386 tty_drv->num = 1;
1387 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1388 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1389 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1390 tty_drv->init_termios = tty_std_termios;
1391
1392 tty_set_operations(tty_drv, &ifx_spi_serial_ops);
1393
1394 result = tty_register_driver(tty_drv);
1395 if (result) {
1396 pr_err("%s: tty_register_driver failed(%d)",
1397 DRVNAME, result);
Vasiliy Kulikova4fb0b22010-11-19 21:41:45 +03001398 put_tty_driver(tty_drv);
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001399 return result;
1400 }
1401
Russ Gorby8115be02011-02-07 12:02:32 -08001402 result = spi_register_driver((void *)&ifx_spi_driver);
Russ Gorbyaf3b8882010-10-26 14:13:52 +01001403 if (result) {
1404 pr_err("%s: spi_register_driver failed(%d)",
1405 DRVNAME, result);
1406 tty_unregister_driver(tty_drv);
1407 }
1408 return result;
1409}
1410
1411module_init(ifx_spi_init);
1412module_exit(ifx_spi_exit);
1413
1414MODULE_AUTHOR("Intel");
1415MODULE_DESCRIPTION("IFX6x60 spi driver");
1416MODULE_LICENSE("GPL");
1417MODULE_INFO(Version, "0.1-IFX6x60");