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tg3: Add EEE support
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / coldfire_qspi.c
blob052b3c7fa6a0f644d26c613e67e69ffe00ad05be
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/sched.h>
28 #include <linux/workqueue.h>
29 #include <linux/delay.h>
30 #include <linux/io.h>
31 #include <linux/clk.h>
32 #include <linux/err.h>
33 #include <linux/spi/spi.h>
34
35 #include <asm/coldfire.h>
36 #include <asm/mcfqspi.h>
37
38 #define DRIVER_NAME "mcfqspi"
39
40 #define MCFQSPI_BUSCLK (MCF_BUSCLK / 2)
41
42 #define MCFQSPI_QMR 0x00
43 #define MCFQSPI_QMR_MSTR 0x8000
44 #define MCFQSPI_QMR_CPOL 0x0200
45 #define MCFQSPI_QMR_CPHA 0x0100
46 #define MCFQSPI_QDLYR 0x04
47 #define MCFQSPI_QDLYR_SPE 0x8000
48 #define MCFQSPI_QWR 0x08
49 #define MCFQSPI_QWR_HALT 0x8000
50 #define MCFQSPI_QWR_WREN 0x4000
51 #define MCFQSPI_QWR_CSIV 0x1000
52 #define MCFQSPI_QIR 0x0C
53 #define MCFQSPI_QIR_WCEFB 0x8000
54 #define MCFQSPI_QIR_ABRTB 0x4000
55 #define MCFQSPI_QIR_ABRTL 0x1000
56 #define MCFQSPI_QIR_WCEFE 0x0800
57 #define MCFQSPI_QIR_ABRTE 0x0400
58 #define MCFQSPI_QIR_SPIFE 0x0100
59 #define MCFQSPI_QIR_WCEF 0x0008
60 #define MCFQSPI_QIR_ABRT 0x0004
61 #define MCFQSPI_QIR_SPIF 0x0001
62 #define MCFQSPI_QAR 0x010
63 #define MCFQSPI_QAR_TXBUF 0x00
64 #define MCFQSPI_QAR_RXBUF 0x10
65 #define MCFQSPI_QAR_CMDBUF 0x20
66 #define MCFQSPI_QDR 0x014
67 #define MCFQSPI_QCR 0x014
68 #define MCFQSPI_QCR_CONT 0x8000
69 #define MCFQSPI_QCR_BITSE 0x4000
70 #define MCFQSPI_QCR_DT 0x2000
71
72 struct mcfqspi {
73 void __iomem *iobase;
74 int irq;
75 struct clk *clk;
76 struct mcfqspi_cs_control *cs_control;
77
78 wait_queue_head_t waitq;
79
80 struct work_struct work;
81 struct workqueue_struct *workq;
82 spinlock_t lock;
83 struct list_head msgq;
84 };
85
86 static void mcfqspi_wr_qmr(struct mcfqspi *mcfqspi, u16 val)
87 {
88 writew(val, mcfqspi->iobase + MCFQSPI_QMR);
89 }
90
91 static void mcfqspi_wr_qdlyr(struct mcfqspi *mcfqspi, u16 val)
92 {
93 writew(val, mcfqspi->iobase + MCFQSPI_QDLYR);
94 }
95
96 static u16 mcfqspi_rd_qdlyr(struct mcfqspi *mcfqspi)
97 {
98 return readw(mcfqspi->iobase + MCFQSPI_QDLYR);
99 }
100
101 static void mcfqspi_wr_qwr(struct mcfqspi *mcfqspi, u16 val)
102 {
103 writew(val, mcfqspi->iobase + MCFQSPI_QWR);
104 }
105
106 static void mcfqspi_wr_qir(struct mcfqspi *mcfqspi, u16 val)
107 {
108 writew(val, mcfqspi->iobase + MCFQSPI_QIR);
109 }
110
111 static void mcfqspi_wr_qar(struct mcfqspi *mcfqspi, u16 val)
112 {
113 writew(val, mcfqspi->iobase + MCFQSPI_QAR);
114 }
115
116 static void mcfqspi_wr_qdr(struct mcfqspi *mcfqspi, u16 val)
117 {
118 writew(val, mcfqspi->iobase + MCFQSPI_QDR);
119 }
120
121 static u16 mcfqspi_rd_qdr(struct mcfqspi *mcfqspi)
122 {
123 return readw(mcfqspi->iobase + MCFQSPI_QDR);
124 }
125
126 static void mcfqspi_cs_select(struct mcfqspi *mcfqspi, u8 chip_select,
127 bool cs_high)
128 {
129 mcfqspi->cs_control->select(mcfqspi->cs_control, chip_select, cs_high);
130 }
131
132 static void mcfqspi_cs_deselect(struct mcfqspi *mcfqspi, u8 chip_select,
133 bool cs_high)
134 {
135 mcfqspi->cs_control->deselect(mcfqspi->cs_control, chip_select, cs_high);
136 }
137
138 static int mcfqspi_cs_setup(struct mcfqspi *mcfqspi)
139 {
140 return (mcfqspi->cs_control && mcfqspi->cs_control->setup) ?
141 mcfqspi->cs_control->setup(mcfqspi->cs_control) : 0;
142 }
143
144 static void mcfqspi_cs_teardown(struct mcfqspi *mcfqspi)
145 {
146 if (mcfqspi->cs_control && mcfqspi->cs_control->teardown)
147 mcfqspi->cs_control->teardown(mcfqspi->cs_control);
148 }
149
150 static u8 mcfqspi_qmr_baud(u32 speed_hz)
151 {
152 return clamp((MCFQSPI_BUSCLK + speed_hz - 1) / speed_hz, 2u, 255u);
153 }
154
155 static bool mcfqspi_qdlyr_spe(struct mcfqspi *mcfqspi)
156 {
157 return mcfqspi_rd_qdlyr(mcfqspi) & MCFQSPI_QDLYR_SPE;
158 }
159
160 static irqreturn_t mcfqspi_irq_handler(int this_irq, void *dev_id)
161 {
162 struct mcfqspi *mcfqspi = dev_id;
163
164 /* clear interrupt */
165 mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE | MCFQSPI_QIR_SPIF);
166 wake_up(&mcfqspi->waitq);
167
168 return IRQ_HANDLED;
169 }
170
171 static void mcfqspi_transfer_msg8(struct mcfqspi *mcfqspi, unsigned count,
172 const u8 *txbuf, u8 *rxbuf)
173 {
174 unsigned i, n, offset = 0;
175
176 n = min(count, 16u);
177
178 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF);
179 for (i = 0; i < n; ++i)
180 mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE);
181
182 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF);
183 if (txbuf)
184 for (i = 0; i < n; ++i)
185 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
186 else
187 for (i = 0; i < count; ++i)
188 mcfqspi_wr_qdr(mcfqspi, 0);
189
190 count -= n;
191 if (count) {
192 u16 qwr = 0xf08;
193 mcfqspi_wr_qwr(mcfqspi, 0x700);
194 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
195
196 do {
197 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
198 mcfqspi_wr_qwr(mcfqspi, qwr);
199 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
200 if (rxbuf) {
201 mcfqspi_wr_qar(mcfqspi,
202 MCFQSPI_QAR_RXBUF + offset);
203 for (i = 0; i < 8; ++i)
204 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
205 }
206 n = min(count, 8u);
207 if (txbuf) {
208 mcfqspi_wr_qar(mcfqspi,
209 MCFQSPI_QAR_TXBUF + offset);
210 for (i = 0; i < n; ++i)
211 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
212 }
213 qwr = (offset ? 0x808 : 0) + ((n - 1) << 8);
214 offset ^= 8;
215 count -= n;
216 } while (count);
217 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
218 mcfqspi_wr_qwr(mcfqspi, qwr);
219 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
220 if (rxbuf) {
221 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
222 for (i = 0; i < 8; ++i)
223 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
224 offset ^= 8;
225 }
226 } else {
227 mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8);
228 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
229 }
230 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
231 if (rxbuf) {
232 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
233 for (i = 0; i < n; ++i)
234 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
235 }
236 }
237
238 static void mcfqspi_transfer_msg16(struct mcfqspi *mcfqspi, unsigned count,
239 const u16 *txbuf, u16 *rxbuf)
240 {
241 unsigned i, n, offset = 0;
242
243 n = min(count, 16u);
244
245 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_CMDBUF);
246 for (i = 0; i < n; ++i)
247 mcfqspi_wr_qdr(mcfqspi, MCFQSPI_QCR_BITSE);
248
249 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_TXBUF);
250 if (txbuf)
251 for (i = 0; i < n; ++i)
252 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
253 else
254 for (i = 0; i < count; ++i)
255 mcfqspi_wr_qdr(mcfqspi, 0);
256
257 count -= n;
258 if (count) {
259 u16 qwr = 0xf08;
260 mcfqspi_wr_qwr(mcfqspi, 0x700);
261 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
262
263 do {
264 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
265 mcfqspi_wr_qwr(mcfqspi, qwr);
266 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
267 if (rxbuf) {
268 mcfqspi_wr_qar(mcfqspi,
269 MCFQSPI_QAR_RXBUF + offset);
270 for (i = 0; i < 8; ++i)
271 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
272 }
273 n = min(count, 8u);
274 if (txbuf) {
275 mcfqspi_wr_qar(mcfqspi,
276 MCFQSPI_QAR_TXBUF + offset);
277 for (i = 0; i < n; ++i)
278 mcfqspi_wr_qdr(mcfqspi, *txbuf++);
279 }
280 qwr = (offset ? 0x808 : 0x000) + ((n - 1) << 8);
281 offset ^= 8;
282 count -= n;
283 } while (count);
284 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
285 mcfqspi_wr_qwr(mcfqspi, qwr);
286 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
287 if (rxbuf) {
288 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
289 for (i = 0; i < 8; ++i)
290 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
291 offset ^= 8;
292 }
293 } else {
294 mcfqspi_wr_qwr(mcfqspi, (n - 1) << 8);
295 mcfqspi_wr_qdlyr(mcfqspi, MCFQSPI_QDLYR_SPE);
296 }
297 wait_event(mcfqspi->waitq, !mcfqspi_qdlyr_spe(mcfqspi));
298 if (rxbuf) {
299 mcfqspi_wr_qar(mcfqspi, MCFQSPI_QAR_RXBUF + offset);
300 for (i = 0; i < n; ++i)
301 *rxbuf++ = mcfqspi_rd_qdr(mcfqspi);
302 }
303 }
304
305 static void mcfqspi_work(struct work_struct *work)
306 {
307 struct mcfqspi *mcfqspi = container_of(work, struct mcfqspi, work);
308 unsigned long flags;
309
310 spin_lock_irqsave(&mcfqspi->lock, flags);
311 while (!list_empty(&mcfqspi->msgq)) {
312 struct spi_message *msg;
313 struct spi_device *spi;
314 struct spi_transfer *xfer;
315 int status = 0;
316
317 msg = container_of(mcfqspi->msgq.next, struct spi_message,
318 queue);
319
320 list_del_init(&mcfqspi->msgq);
321 spin_unlock_irqrestore(&mcfqspi->lock, flags);
322
323 spi = msg->spi;
324
325 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
326 bool cs_high = spi->mode & SPI_CS_HIGH;
327 u16 qmr = MCFQSPI_QMR_MSTR;
328
329 if (xfer->bits_per_word)
330 qmr |= xfer->bits_per_word << 10;
331 else
332 qmr |= spi->bits_per_word << 10;
333 if (spi->mode & SPI_CPHA)
334 qmr |= MCFQSPI_QMR_CPHA;
335 if (spi->mode & SPI_CPOL)
336 qmr |= MCFQSPI_QMR_CPOL;
337 if (xfer->speed_hz)
338 qmr |= mcfqspi_qmr_baud(xfer->speed_hz);
339 else
340 qmr |= mcfqspi_qmr_baud(spi->max_speed_hz);
341 mcfqspi_wr_qmr(mcfqspi, qmr);
342
343 mcfqspi_cs_select(mcfqspi, spi->chip_select, cs_high);
344
345 mcfqspi_wr_qir(mcfqspi, MCFQSPI_QIR_SPIFE);
346 if ((xfer->bits_per_word ? xfer->bits_per_word :
347 spi->bits_per_word) == 8)
348 mcfqspi_transfer_msg8(mcfqspi, xfer->len,
349 xfer->tx_buf,
350 xfer->rx_buf);
351 else
352 mcfqspi_transfer_msg16(mcfqspi, xfer->len / 2,
353 xfer->tx_buf,
354 xfer->rx_buf);
355 mcfqspi_wr_qir(mcfqspi, 0);
356
357 if (xfer->delay_usecs)
358 udelay(xfer->delay_usecs);
359 if (xfer->cs_change) {
360 if (!list_is_last(&xfer->transfer_list,
361 &msg->transfers))
362 mcfqspi_cs_deselect(mcfqspi,
363 spi->chip_select,
364 cs_high);
365 } else {
366 if (list_is_last(&xfer->transfer_list,
367 &msg->transfers))
368 mcfqspi_cs_deselect(mcfqspi,
369 spi->chip_select,
370 cs_high);
371 }
372 msg->actual_length += xfer->len;
373 }
374 msg->status = status;
375 msg->complete(msg->context);
376
377 spin_lock_irqsave(&mcfqspi->lock, flags);
378 }
379 spin_unlock_irqrestore(&mcfqspi->lock, flags);
380 }
381
382 static int mcfqspi_transfer(struct spi_device *spi, struct spi_message *msg)
383 {
384 struct mcfqspi *mcfqspi;
385 struct spi_transfer *xfer;
386 unsigned long flags;
387
388 mcfqspi = spi_master_get_devdata(spi->master);
389
390 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
391 if (xfer->bits_per_word && ((xfer->bits_per_word < 8)
392 || (xfer->bits_per_word > 16))) {
393 dev_dbg(&spi->dev,
394 "%d bits per word is not supported\n",
395 xfer->bits_per_word);
396 goto fail;
397 }
398 if (xfer->speed_hz) {
399 u32 real_speed = MCFQSPI_BUSCLK /
400 mcfqspi_qmr_baud(xfer->speed_hz);
401 if (real_speed != xfer->speed_hz)
402 dev_dbg(&spi->dev,
403 "using speed %d instead of %d\n",
404 real_speed, xfer->speed_hz);
405 }
406 }
407 msg->status = -EINPROGRESS;
408 msg->actual_length = 0;
409
410 spin_lock_irqsave(&mcfqspi->lock, flags);
411 list_add_tail(&msg->queue, &mcfqspi->msgq);
412 queue_work(mcfqspi->workq, &mcfqspi->work);
413 spin_unlock_irqrestore(&mcfqspi->lock, flags);
414
415 return 0;
416 fail:
417 msg->status = -EINVAL;
418 return -EINVAL;
419 }
420
421 static int mcfqspi_setup(struct spi_device *spi)
422 {
423 if ((spi->bits_per_word < 8) || (spi->bits_per_word > 16)) {
424 dev_dbg(&spi->dev, "%d bits per word is not supported\n",
425 spi->bits_per_word);
426 return -EINVAL;
427 }
428 if (spi->chip_select >= spi->master->num_chipselect) {
429 dev_dbg(&spi->dev, "%d chip select is out of range\n",
430 spi->chip_select);
431 return -EINVAL;
432 }
433
434 mcfqspi_cs_deselect(spi_master_get_devdata(spi->master),
435 spi->chip_select, spi->mode & SPI_CS_HIGH);
436
437 dev_dbg(&spi->dev,
438 "bits per word %d, chip select %d, speed %d KHz\n",
439 spi->bits_per_word, spi->chip_select,
440 (MCFQSPI_BUSCLK / mcfqspi_qmr_baud(spi->max_speed_hz))
441 / 1000);
442
443 return 0;
444 }
445
446 static int __devinit mcfqspi_probe(struct platform_device *pdev)
447 {
448 struct spi_master *master;
449 struct mcfqspi *mcfqspi;
450 struct resource *res;
451 struct mcfqspi_platform_data *pdata;
452 int status;
453
454 master = spi_alloc_master(&pdev->dev, sizeof(*mcfqspi));
455 if (master == NULL) {
456 dev_dbg(&pdev->dev, "spi_alloc_master failed\n");
457 return -ENOMEM;
458 }
459
460 mcfqspi = spi_master_get_devdata(master);
461
462 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
463 if (!res) {
464 dev_dbg(&pdev->dev, "platform_get_resource failed\n");
465 status = -ENXIO;
466 goto fail0;
467 }
468
469 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
470 dev_dbg(&pdev->dev, "request_mem_region failed\n");
471 status = -EBUSY;
472 goto fail0;
473 }
474
475 mcfqspi->iobase = ioremap(res->start, resource_size(res));
476 if (!mcfqspi->iobase) {
477 dev_dbg(&pdev->dev, "ioremap failed\n");
478 status = -ENOMEM;
479 goto fail1;
480 }
481
482 mcfqspi->irq = platform_get_irq(pdev, 0);
483 if (mcfqspi->irq < 0) {
484 dev_dbg(&pdev->dev, "platform_get_irq failed\n");
485 status = -ENXIO;
486 goto fail2;
487 }
488
489 status = request_irq(mcfqspi->irq, mcfqspi_irq_handler, IRQF_DISABLED,
490 pdev->name, mcfqspi);
491 if (status) {
492 dev_dbg(&pdev->dev, "request_irq failed\n");
493 goto fail2;
494 }
495
496 mcfqspi->clk = clk_get(&pdev->dev, "qspi_clk");
497 if (IS_ERR(mcfqspi->clk)) {
498 dev_dbg(&pdev->dev, "clk_get failed\n");
499 status = PTR_ERR(mcfqspi->clk);
500 goto fail3;
501 }
502 clk_enable(mcfqspi->clk);
503
504 mcfqspi->workq = create_singlethread_workqueue(dev_name(master->dev.parent));
505 if (!mcfqspi->workq) {
506 dev_dbg(&pdev->dev, "create_workqueue failed\n");
507 status = -ENOMEM;
508 goto fail4;
509 }
510 INIT_WORK(&mcfqspi->work, mcfqspi_work);
511 spin_lock_init(&mcfqspi->lock);
512 INIT_LIST_HEAD(&mcfqspi->msgq);
513 init_waitqueue_head(&mcfqspi->waitq);
514
515 pdata = pdev->dev.platform_data;
516 if (!pdata) {
517 dev_dbg(&pdev->dev, "platform data is missing\n");
518 goto fail5;
519 }
520 master->bus_num = pdata->bus_num;
521 master->num_chipselect = pdata->num_chipselect;
522
523 mcfqspi->cs_control = pdata->cs_control;
524 status = mcfqspi_cs_setup(mcfqspi);
525 if (status) {
526 dev_dbg(&pdev->dev, "error initializing cs_control\n");
527 goto fail5;
528 }
529
530 master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA;
531 master->setup = mcfqspi_setup;
532 master->transfer = mcfqspi_transfer;
533
534 platform_set_drvdata(pdev, master);
535
536 status = spi_register_master(master);
537 if (status) {
538 dev_dbg(&pdev->dev, "spi_register_master failed\n");
539 goto fail6;
540 }
541 dev_info(&pdev->dev, "Coldfire QSPI bus driver\n");
542
543 return 0;
544
545 fail6:
546 mcfqspi_cs_teardown(mcfqspi);
547 fail5:
548 destroy_workqueue(mcfqspi->workq);
549 fail4:
550 clk_disable(mcfqspi->clk);
551 clk_put(mcfqspi->clk);
552 fail3:
553 free_irq(mcfqspi->irq, mcfqspi);
554 fail2:
555 iounmap(mcfqspi->iobase);
556 fail1:
557 release_mem_region(res->start, resource_size(res));
558 fail0:
559 spi_master_put(master);
560
561 dev_dbg(&pdev->dev, "Coldfire QSPI probe failed\n");
562
563 return status;
564 }
565
566 static int __devexit mcfqspi_remove(struct platform_device *pdev)
567 {
568 struct spi_master *master = platform_get_drvdata(pdev);
569 struct mcfqspi *mcfqspi = spi_master_get_devdata(master);
570 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
571
572 /* disable the hardware (set the baud rate to 0) */
573 mcfqspi_wr_qmr(mcfqspi, MCFQSPI_QMR_MSTR);
574
575 platform_set_drvdata(pdev, NULL);
576 mcfqspi_cs_teardown(mcfqspi);
577 destroy_workqueue(mcfqspi->workq);
578 clk_disable(mcfqspi->clk);
579 clk_put(mcfqspi->clk);
580 free_irq(mcfqspi->irq, mcfqspi);
581 iounmap(mcfqspi->iobase);
582 release_mem_region(res->start, resource_size(res));
583 spi_unregister_master(master);
584 spi_master_put(master);
585
586 return 0;
587 }
588
589 #ifdef CONFIG_PM
590
591 static int mcfqspi_suspend(struct device *dev)
592 {
593 struct mcfqspi *mcfqspi = platform_get_drvdata(to_platform_device(dev));
594
595 clk_disable(mcfqspi->clk);
596
597 return 0;
598 }
599
600 static int mcfqspi_resume(struct device *dev)
601 {
602 struct mcfqspi *mcfqspi = platform_get_drvdata(to_platform_device(dev));
603
604 clk_enable(mcfqspi->clk);
605
606 return 0;
607 }
608
609 static struct dev_pm_ops mcfqspi_dev_pm_ops = {
610 .suspend = mcfqspi_suspend,
611 .resume = mcfqspi_resume,
612 };
613
614 #define MCFQSPI_DEV_PM_OPS (&mcfqspi_dev_pm_ops)
615 #else
616 #define MCFQSPI_DEV_PM_OPS NULL
617 #endif
618
619 static struct platform_driver mcfqspi_driver = {
620 .driver.name = DRIVER_NAME,
621 .driver.owner = THIS_MODULE,
622 .driver.pm = MCFQSPI_DEV_PM_OPS,
623 .remove = __devexit_p(mcfqspi_remove),
624 };
625
626 static int __init mcfqspi_init(void)
627 {
628 return platform_driver_probe(&mcfqspi_driver, mcfqspi_probe);
629 }
630 module_init(mcfqspi_init);
631
632 static void __exit mcfqspi_exit(void)
633 {
634 platform_driver_unregister(&mcfqspi_driver);
635 }
636 module_exit(mcfqspi_exit);
637
638 MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
639 MODULE_DESCRIPTION("Coldfire QSPI Controller Driver");
640 MODULE_LICENSE("GPL");
641 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree