?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ASoC: ep93xx i2s audio driver
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / coldfire_qspi.c
blob59be3efe063621e2fffb7b576e8ea0d8daa10b32
1 /*
2 * Freescale/Motorola Coldfire Queued SPI driver
3 *
4 * Copyright 2010 Steven King <sfking@fdwdc.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/errno.h>
26 #include <linux/platform_device.h>
27 #include <linux/workqueue.h>
28 #include <linux/delay.h>
29 #include <linux/io.h>
30 #include <linux/clk.h>
31 #include <linux/err.h>
32 #include <linux/spi/spi.h>
33
34 #include <asm/coldfire.h>
35 #include <asm/mcfqspi.h>
36
37 #define DRIVER_NAME "mcfqspi"
38
39 #define MCFQSPI_BUSCLK (MCF_BUSCLK / 2)
40
41 #define MCFQSPI_QMR 0x00
42 #define MCFQSPI_QMR_MSTR 0x8000
43 #define MCFQSPI_QMR_CPOL 0x0200
44 #define MCFQSPI_QMR_CPHA 0x0100
45 #define MCFQSPI_QDLYR 0x04
46 #define MCFQSPI_QDLYR_SPE 0x8000
47 #define MCFQSPI_QWR 0x08
48 #define MCFQSPI_QWR_HALT 0x8000
49 #define MCFQSPI_QWR_WREN 0x4000
50 #define MCFQSPI_QWR_CSIV 0x1000
51 #define MCFQSPI_QIR 0x0C
52 #define MCFQSPI_QIR_WCEFB 0x8000
53 #define MCFQSPI_QIR_ABRTB 0x4000
54 #define MCFQSPI_QIR_ABRTL 0x1000
55 #define MCFQSPI_QIR_WCEFE 0x0800
56 #define MCFQSPI_QIR_ABRTE 0x0400
57 #define MCFQSPI_QIR_SPIFE 0x0100
58 #define MCFQSPI_QIR_WCEF 0x0008
59 #define MCFQSPI_QIR_ABRT 0x0004
60 #define MCFQSPI_QIR_SPIF 0x0001
61 #define MCFQSPI_QAR 0x010
62 #define MCFQSPI_QAR_TXBUF 0x00
63 #define MCFQSPI_QAR_RXBUF 0x10
64 #define MCFQSPI_QAR_CMDBUF 0x20
65 #define MCFQSPI_QDR 0x014
66 #define MCFQSPI_QCR 0x014
67 #define MCFQSPI_QCR_CONT 0x8000
68 #define MCFQSPI_QCR_BITSE 0x4000
69 #define MCFQSPI_QCR_DT 0x2000
70
71 struct mcfqspi {
72 void __iomem *iobase;
73 int irq;
74 struct clk *clk;
75 struct mcfqspi_cs_control *cs_control;
76
77 wait_queue_head_t waitq;
78
79 struct work_struct work;
80 struct workqueue_struct *workq;
81 spinlock_t lock;
82 struct list_head msgq;
83 };
84
85 static void mcfqspi_wr_qmr(struct mcfqspi *mcfqspi, u16 val)
86 {
87 writew(val, mcfqspi->iobase + MCFQSPI_QMR);
88 }
89
90 static void mcfqspi_wr_qdlyr(struct mcfqspi *mcfqspi, u16 val)
91 {
92 writew(val, mcfqspi->iobase + MCFQSPI_QDLYR);
93 }
94
95 static u16 mcfqspi_rd_qdlyr(struct mcfqspi *mcfqspi)
96 {
97 return readw(mcfqspi->iobase + MCFQSPI_QDLYR);
98 }
99
100 static void mcfqspi_wr_qwr(struct mcfqspi *mcfqspi, u16 val)
101 {
102 writew(val, mcfqspi->iobase + MCFQSPI_QWR);
103 }
104
105 static void mcfqspi_wr_qir(struct mcfqspi *mcfqspi, u16 val)
106 {
107 writew(val, mcfqspi->iobase + MCFQSPI_QIR);
108 }
109
110 static void mcfqspi_wr_qar(struct mcfqspi *mcfqspi, u16 val)
111 {
112 writew(val, mcfqspi->iobase + MCFQSPI_QAR);
113 }
114
115 static void mcfqspi_wr_qdr(struct mcfqspi *mcfqspi, u16 val)
116 {
117 writew(val, mcfqspi->iobase + MCFQSPI_QDR);
118 }
119
120 static u16 mcfqspi_rd_qdr(struct mcfqspi *mcfqspi)
121 {
122 return readw(mcfqspi->iobase + MCFQSPI_QDR);
123 }
124
125 static void mcfqspi_cs_select(struct mcfqspi *mcfqspi, u8 chip_select,
126 bool cs_high)
127 {
128 mcfqspi->cs_control->select(mcfqspi->cs_control, chip_select, cs_high);
129 }
130
131 static void mcfqspi_cs_deselect(struct mcfqspi *mcfqspi, u8 chip_select,
132 bool cs_high)
133 {
134 mcfqspi->cs_control->deselect(mcfqspi->cs_control, chip_select, cs_high);
135 }
136
137 static int mcfqspi_cs_setup(struct mcfqspi *mcfqspi)
138 {
139 return (mcfqspi->cs_control && mcfqspi->cs_control->setup) ?
140 mcfqspi->cs_control->setup(mcfqspi->cs_control) : 0;
141 }
142
143 static void mcfqspi_cs_teardown(struct mcfqspi *mcfqspi)
144 {
145 if (mcfqspi->cs_control && mcfqspi->cs_control->teardown)
146 mcfqspi->cs_control->teardown(mcfqspi->cs_control);
147 }
148
149 static u8 mcfqspi_qmr_baud(u32 speed_hz)
150 {
151 return clamp((MCFQSPI_BUSCLK + speed_hz - 1) / speed_hz, 2u, 255u);
152 }
153
154 static bool mcfqspi_qdlyr_spe(struct mcfqspi *mcfqspi)
155 {
156 return mcfqspi_rd_qdlyr(mcfqspi) & MCFQSPI_QDLYR_SPE;
157 }
158
159 static irqreturn_t mcfqspi_irq_handler(int this_irq, void *dev_id)
160 {
161 struct mcfqspi *mcfqspi = dev_id;
162
163 /* clear interrupt */
164 mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE | MCFQSPI_QIR_SPIF);
165 wake_up(&mcfqspi->waitq);
166
167 return IRQ_HANDLED;
168 }
169
170 static void mcfqspi_transfer_msg8(struct mcfqspi *mcfqspi, unsigned count,
171 const u8 *txbuf, u8 *rxbuf)
172 {
173 unsigned i, n, offset = 0;
174
175 n = min(count, 16u);
176
177 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF);
178 for (i = 0; i < n; ++i)
179 mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE);
180
181 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF);
182 if (txbuf)
183 for (i = 0; i < n; ++i)
184 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
185 else
186 for (i = 0; i < count; ++i)
187 mcfqspi_wr_qdr(mcfqspi, 0);
188
189 count -= n;
190 if (count) {
191 u16 qwr = 0xf08;
192 mcfqspi_wr_qwr(mcfqspi, 0x700);
193 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
194
195 do {
196 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
197 mcfqspi_wr_qwr(mcfqspi, qwr);
198 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
199 if (rxbuf) {
200 mcfqspi_wr_qar(mcfqspi,
201 MCFQSPI_QAR_RXBUF + offset);
202 for (i = 0; i < 8; ++i)
203 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
204 }
205 n = min(count, 8u);
206 if (txbuf) {
207 mcfqspi_wr_qar(mcfqspi,
208 MCFQSPI_QAR_TXBUF + offset);
209 for (i = 0; i < n; ++i)
210 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
211 }
212 qwr = (offset ? 0x808 : 0) + ((n - 1) << 8);
213 offset ^= 8;
214 count -= n;
215 } while (count);
216 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
217 mcfqspi_wr_qwr(mcfqspi, qwr);
218 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
219 if (rxbuf) {
220 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
221 for (i = 0; i < 8; ++i)
222 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
223 offset ^= 8;
224 }
225 } else {
226 mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8);
227 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
228 }
229 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
230 if (rxbuf) {
231 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
232 for (i = 0; i < n; ++i)
233 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
234 }
235 }
236
237 static void mcfqspi_transfer_msg16(struct mcfqspi *mcfqspi, unsigned count,
238 const u16 *txbuf, u16 *rxbuf)
239 {
240 unsigned i, n, offset = 0;
241
242 n = min(count, 16u);
243
244 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF);
245 for (i = 0; i < n; ++i)
246 mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE);
247
248 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF);
249 if (txbuf)
250 for (i = 0; i < n; ++i)
251 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
252 else
253 for (i = 0; i < count; ++i)
254 mcfqspi_wr_qdr(mcfqspi, 0);
255
256 count -= n;
257 if (count) {
258 u16 qwr = 0xf08;
259 mcfqspi_wr_qwr(mcfqspi, 0x700);
260 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
261
262 do {
263 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
264 mcfqspi_wr_qwr(mcfqspi, qwr);
265 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
266 if (rxbuf) {
267 mcfqspi_wr_qar(mcfqspi,
268 MCFQSPI_QAR_RXBUF + offset);
269 for (i = 0; i < 8; ++i)
270 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
271 }
272 n = min(count, 8u);
273 if (txbuf) {
274 mcfqspi_wr_qar(mcfqspi,
275 MCFQSPI_QAR_TXBUF + offset);
276 for (i = 0; i < n; ++i)
277 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
278 }
279 qwr = (offset ? 0x808 : 0x000) + ((n - 1) << 8);
280 offset ^= 8;
281 count -= n;
282 } while (count);
283 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
284 mcfqspi_wr_qwr(mcfqspi, qwr);
285 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
286 if (rxbuf) {
287 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
288 for (i = 0; i < 8; ++i)
289 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
290 offset ^= 8;
291 }
292 } else {
293 mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8);
294 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
295 }
296 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
297 if (rxbuf) {
298 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
299 for (i = 0; i < n; ++i)
300 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
301 }
302 }
303
304 static void mcfqspi_work(struct work_struct *work)
305 {
306 struct mcfqspi *mcfqspi = container_of(work, struct mcfqspi, work);
307 unsigned long flags;
308
309 spin_lock_irqsave(&mcfqspi->lock, flags);
310 while (!list_empty(&mcfqspi->msgq)) {
311 struct spi_message *msg;
312 struct spi_device *spi;
313 struct spi_transfer *xfer;
314 int status = 0;
315
316 msg = container_of(mcfqspi->msgq.next, struct spi_message,
317 queue);
318
319 list_del_init(&mcfqspi->msgq);
320 spin_unlock_irqrestore(&mcfqspi->lock, flags);
321
322 spi = msg->spi;
323
324 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
325 bool cs_high = spi->mode & SPI_CS_HIGH;
326 u16 qmr = MCFQSPI_QMR_MSTR;
327
328 if (xfer->bits_per_word)
329 qmr |= xfer->bits_per_word << 10;
330 else
331 qmr |= spi->bits_per_word << 10;
332 if (spi->mode & SPI_CPHA)
333 qmr |= MCFQSPI_QMR_CPHA;
334 if (spi->mode & SPI_CPOL)
335 qmr |= MCFQSPI_QMR_CPOL;
336 if (xfer->speed_hz)
337 qmr |= mcfqspi_qmr_baud(xfer->speed_hz);
338 else
339 qmr |= mcfqspi_qmr_baud(spi->max_speed_hz);
340 mcfqspi_wr_qmr(mcfqspi, qmr);
341
342 mcfqspi_cs_select(mcfqspi, spi->chip_select, cs_high);
343
344 mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE);
345 if ((xfer->bits_per_word ? xfer->bits_per_word :
346 spi->bits_per_word) == 8)
347 mcfqspi_transfer_msg8(mcfqspi, xfer->len,
348 xfer->tx_buf,
349 xfer->rx_buf);
350 else
351 mcfqspi_transfer_msg16(mcfqspi, xfer->len / 2,
352 xfer->tx_buf,
353 xfer->rx_buf);
354 mcfqspi_wr_qir(mcfqspi, 0);
355
356 if (xfer->delay_usecs)
357 udelay(xfer->delay_usecs);
358 if (xfer->cs_change) {
359 if (!list_is_last(&xfer->transfer_list,
360 &msg->transfers))
361 mcfqspi_cs_deselect(mcfqspi,
362 spi->chip_select,
363 cs_high);
364 } else {
365 if (list_is_last(&xfer->transfer_list,
366 &msg->transfers))
367 mcfqspi_cs_deselect(mcfqspi,
368 spi->chip_select,
369 cs_high);
370 }
371 msg->actual_length += xfer->len;
372 }
373 msg->status = status;
374 msg->complete(msg->context);
375
376 spin_lock_irqsave(&mcfqspi->lock, flags);
377 }
378 spin_unlock_irqrestore(&mcfqspi->lock, flags);
379 }
380
381 static int mcfqspi_transfer(struct spi_device *spi, struct spi_message *msg)
382 {
383 struct mcfqspi *mcfqspi;
384 struct spi_transfer *xfer;
385 unsigned long flags;
386
387 mcfqspi = spi_master_get_devdata(spi->master);
388
389 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
390 if (xfer->bits_per_word && ((xfer->bits_per_word < 8)
391 || (xfer->bits_per_word > 16))) {
392 dev_dbg(&spi->dev,
393 "%d bits per word is not supported\n",
394 xfer->bits_per_word);
395 goto fail;
396 }
397 if (xfer->speed_hz) {
398 u32 real_speed = MCFQSPI_BUSCLK /
399 mcfqspi_qmr_baud(xfer->speed_hz);
400 if (real_speed != xfer->speed_hz)
401 dev_dbg(&spi->dev,
402 "using speed %d instead of %d\n",
403 real_speed, xfer->speed_hz);
404 }
405 }
406 msg->status = -EINPROGRESS;
407 msg->actual_length = 0;
408
409 spin_lock_irqsave(&mcfqspi->lock, flags);
410 list_add_tail(&msg->queue, &mcfqspi->msgq);
411 queue_work(mcfqspi->workq, &mcfqspi->work);
412 spin_unlock_irqrestore(&mcfqspi->lock, flags);
413
414 return 0;
415 fail:
416 msg->status = -EINVAL;
417 return -EINVAL;
418 }
419
420 static int mcfqspi_setup(struct spi_device *spi)
421 {
422 if ((spi->bits_per_word < 8) || (spi->bits_per_word > 16)) {
423 dev_dbg(&spi->dev, "%d bits per word is not supported\n",
424 spi->bits_per_word);
425 return -EINVAL;
426 }
427 if (spi->chip_select >= spi->master->num_chipselect) {
428 dev_dbg(&spi->dev, "%d chip select is out of range\n",
429 spi->chip_select);
430 return -EINVAL;
431 }
432
433 mcfqspi_cs_deselect(spi_master_get_devdata(spi->master),
434 spi->chip_select, spi->mode & SPI_CS_HIGH);
435
436 dev_dbg(&spi->dev,
437 "bits per word %d, chip select %d, speed %d KHz\n",
438 spi->bits_per_word, spi->chip_select,
439 (MCFQSPI_BUSCLK / mcfqspi_qmr_baud(spi->max_speed_hz))
440 / 1000);
441
442 return 0;
443 }
444
445 static int __devinit mcfqspi_probe(struct platform_device *pdev)
446 {
447 struct spi_master *master;
448 struct mcfqspi *mcfqspi;
449 struct resource *res;
450 struct mcfqspi_platform_data *pdata;
451 int status;
452
453 master = spi_alloc_master(&pdev->dev, sizeof(*mcfqspi));
454 if (master == NULL) {
455 dev_dbg(&pdev->dev, "spi_alloc_master failed\n");
456 return -ENOMEM;
457 }
458
459 mcfqspi = spi_master_get_devdata(master);
460
461 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
462 if (!res) {
463 dev_dbg(&pdev->dev, "platform_get_resource failed\n");
464 status = -ENXIO;
465 goto fail0;
466 }
467
468 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
469 dev_dbg(&pdev->dev, "request_mem_region failed\n");
470 status = -EBUSY;
471 goto fail0;
472 }
473
474 mcfqspi->iobase = ioremap(res->start, resource_size(res));
475 if (!mcfqspi->iobase) {
476 dev_dbg(&pdev->dev, "ioremap failed\n");
477 status = -ENOMEM;
478 goto fail1;
479 }
480
481 mcfqspi->irq = platform_get_irq(pdev, 0);
482 if (mcfqspi->irq < 0) {
483 dev_dbg(&pdev->dev, "platform_get_irq failed\n");
484 status = -ENXIO;
485 goto fail2;
486 }
487
488 status = request_irq(mcfqspi->irq, mcfqspi_irq_handler, IRQF_DISABLED,
489 pdev->name, mcfqspi);
490 if (status) {
491 dev_dbg(&pdev->dev, "request_irq failed\n");
492 goto fail2;
493 }
494
495 mcfqspi->clk = clk_get(&pdev->dev, "qspi_clk");
496 if (IS_ERR(mcfqspi->clk)) {
497 dev_dbg(&pdev->dev, "clk_get failed\n");
498 status = PTR_ERR(mcfqspi->clk);
499 goto fail3;
500 }
501 clk_enable(mcfqspi->clk);
502
503 mcfqspi->workq = create_singlethread_workqueue(dev_name(master->dev.parent));
504 if (!mcfqspi->workq) {
505 dev_dbg(&pdev->dev, "create_workqueue failed\n");
506 status = -ENOMEM;
507 goto fail4;
508 }
509 INIT_WORK(&mcfqspi->work, mcfqspi_work);
510 spin_lock_init(&mcfqspi->lock);
511 INIT_LIST_HEAD(&mcfqspi->msgq);
512 init_waitqueue_head(&mcfqspi->waitq);
513
514 pdata = pdev->dev.platform_data;
515 if (!pdata) {
516 dev_dbg(&pdev->dev, "platform data is missing\n");
517 goto fail5;
518 }
519 master->bus_num = pdata->bus_num;
520 master->num_chipselect = pdata->num_chipselect;
521
522 mcfqspi->cs_control = pdata->cs_control;
523 status = mcfqspi_cs_setup(mcfqspi);
524 if (status) {
525 dev_dbg(&pdev->dev, "error initializing cs_control\n");
526 goto fail5;
527 }
528
529 master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA;
530 master->setup = mcfqspi_setup;
531 master->transfer = mcfqspi_transfer;
532
533 platform_set_drvdata(pdev, master);
534
535 status = spi_register_master(master);
536 if (status) {
537 dev_dbg(&pdev->dev, "spi_register_master failed\n");
538 goto fail6;
539 }
540 dev_info(&pdev->dev, "Coldfire QSPI bus driver\n");
541
542 return 0;
543
544 fail6:
545 mcfqspi_cs_teardown(mcfqspi);
546 fail5:
547 destroy_workqueue(mcfqspi->workq);
548 fail4:
549 clk_disable(mcfqspi->clk);
550 clk_put(mcfqspi->clk);
551 fail3:
552 free_irq(mcfqspi->irq, mcfqspi);
553 fail2:
554 iounmap(mcfqspi->iobase);
555 fail1:
556 release_mem_region(res->start, resource_size(res));
557 fail0:
558 spi_master_put(master);
559
560 dev_dbg(&pdev->dev, "Coldfire QSPI probe failed\n");
561
562 return status;
563 }
564
565 static int __devexit mcfqspi_remove(struct platform_device *pdev)
566 {
567 struct spi_master *master = platform_get_drvdata(pdev);
568 struct mcfqspi *mcfqspi = spi_master_get_devdata(master);
569 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
570
571 /* disable the hardware (set the baud rate to 0) */
572 mcfqspi_wr_qmr(mcfqspi, MCFQSPI_QMR_MSTR);
573
574 platform_set_drvdata(pdev, NULL);
575 mcfqspi_cs_teardown(mcfqspi);
576 destroy_workqueue(mcfqspi->workq);
577 clk_disable(mcfqspi->clk);
578 clk_put(mcfqspi->clk);
579 free_irq(mcfqspi->irq, mcfqspi);
580 iounmap(mcfqspi->iobase);
581 release_mem_region(res->start, resource_size(res));
582 spi_unregister_master(master);
583 spi_master_put(master);
584
585 return 0;
586 }
587
588 #ifdef CONFIG_PM
589
590 static int mcfqspi_suspend(struct device *dev)
591 {
592 struct mcfqspi *mcfqspi = platform_get_drvdata(to_platform_device(dev));
593
594 clk_disable(mcfqspi->clk);
595
596 return 0;
597 }
598
599 static int mcfqspi_resume(struct device *dev)
600 {
601 struct mcfqspi *mcfqspi = platform_get_drvdata(to_platform_device(dev));
602
603 clk_enable(mcfqspi->clk);
604
605 return 0;
606 }
607
608 static struct dev_pm_ops mcfqspi_dev_pm_ops = {
609 .suspend = mcfqspi_suspend,
610 .resume = mcfqspi_resume,
611 };
612
613 #define MCFQSPI_DEV_PM_OPS (&mcfqspi_dev_pm_ops)
614 #else
615 #define MCFQSPI_DEV_PM_OPS NULL
616 #endif
617
618 static struct platform_driver mcfqspi_driver = {
619 .driver.name = DRIVER_NAME,
620 .driver.owner = THIS_MODULE,
621 .driver.pm = MCFQSPI_DEV_PM_OPS,
622 .remove = __devexit_p(mcfqspi_remove),
623 };
624
625 static int __init mcfqspi_init(void)
626 {
627 return platform_driver_probe(&mcfqspi_driver, mcfqspi_probe);
628 }
629 module_init(mcfqspi_init);
630
631 static void __exit mcfqspi_exit(void)
632 {
633 platform_driver_unregister(&mcfqspi_driver);
634 }
635 module_exit(mcfqspi_exit);
636
637 MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
638 MODULE_DESCRIPTION("Coldfire QSPI Controller Driver");
639 MODULE_LICENSE("GPL");
640 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree