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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / spi / spi-sh-msiof.c
blob2f61a84a1fafc235295319ffc4c4b3f7f9090489
1 /*
2 * SuperH MSIOF SPI Master Interface
3 *
4 * Copyright (c) 2009 Magnus Damm
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 version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/bitmap.h>
13 #include <linux/clk.h>
14 #include <linux/completion.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_runtime.h>
25
26 #include <linux/spi/sh_msiof.h>
27 #include <linux/spi/spi.h>
28 #include <linux/spi/spi_bitbang.h>
29
30 #include <asm/unaligned.h>
31
32 struct sh_msiof_spi_priv {
33 struct spi_bitbang bitbang; /* must be first for spi_bitbang.c */
34 void __iomem *mapbase;
35 struct clk *clk;
36 struct platform_device *pdev;
37 struct sh_msiof_spi_info *info;
38 struct completion done;
39 unsigned long flags;
40 int tx_fifo_size;
41 int rx_fifo_size;
42 };
43
44 #define TMDR1 0x00
45 #define TMDR2 0x04
46 #define TMDR3 0x08
47 #define RMDR1 0x10
48 #define RMDR2 0x14
49 #define RMDR3 0x18
50 #define TSCR 0x20
51 #define RSCR 0x22
52 #define CTR 0x28
53 #define FCTR 0x30
54 #define STR 0x40
55 #define IER 0x44
56 #define TDR1 0x48
57 #define TDR2 0x4c
58 #define TFDR 0x50
59 #define RDR1 0x58
60 #define RDR2 0x5c
61 #define RFDR 0x60
62
63 #define CTR_TSCKE (1 << 15)
64 #define CTR_TFSE (1 << 14)
65 #define CTR_TXE (1 << 9)
66 #define CTR_RXE (1 << 8)
67
68 #define STR_TEOF (1 << 23)
69 #define STR_REOF (1 << 7)
70
71 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
72 {
73 switch (reg_offs) {
74 case TSCR:
75 case RSCR:
76 return ioread16(p->mapbase + reg_offs);
77 default:
78 return ioread32(p->mapbase + reg_offs);
79 }
80 }
81
82 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
83 u32 value)
84 {
85 switch (reg_offs) {
86 case TSCR:
87 case RSCR:
88 iowrite16(value, p->mapbase + reg_offs);
89 break;
90 default:
91 iowrite32(value, p->mapbase + reg_offs);
92 break;
93 }
94 }
95
96 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
97 u32 clr, u32 set)
98 {
99 u32 mask = clr | set;
100 u32 data;
101 int k;
102
103 data = sh_msiof_read(p, CTR);
104 data &= ~clr;
105 data |= set;
106 sh_msiof_write(p, CTR, data);
107
108 for (k = 100; k > 0; k--) {
109 if ((sh_msiof_read(p, CTR) & mask) == set)
110 break;
111
112 udelay(10);
113 }
114
115 return k > 0 ? 0 : -ETIMEDOUT;
116 }
117
118 static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
119 {
120 struct sh_msiof_spi_priv *p = data;
121
122 /* just disable the interrupt and wake up */
123 sh_msiof_write(p, IER, 0);
124 complete(&p->done);
125
126 return IRQ_HANDLED;
127 }
128
129 static struct {
130 unsigned short div;
131 unsigned short scr;
132 } const sh_msiof_spi_clk_table[] = {
133 { 1, 0x0007 },
134 { 2, 0x0000 },
135 { 4, 0x0001 },
136 { 8, 0x0002 },
137 { 16, 0x0003 },
138 { 32, 0x0004 },
139 { 64, 0x1f00 },
140 { 128, 0x1f01 },
141 { 256, 0x1f02 },
142 { 512, 0x1f03 },
143 { 1024, 0x1f04 },
144 };
145
146 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
147 unsigned long parent_rate,
148 unsigned long spi_hz)
149 {
150 unsigned long div = 1024;
151 size_t k;
152
153 if (!WARN_ON(!spi_hz || !parent_rate))
154 div = parent_rate / spi_hz;
155
156 /* TODO: make more fine grained */
157
158 for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
159 if (sh_msiof_spi_clk_table[k].div >= div)
160 break;
161 }
162
163 k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
164
165 sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
166 sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
167 }
168
169 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
170 u32 cpol, u32 cpha,
171 u32 tx_hi_z, u32 lsb_first)
172 {
173 u32 tmp;
174 int edge;
175
176 /*
177 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
178 * 0 0 10 10 1 1
179 * 0 1 10 10 0 0
180 * 1 0 11 11 0 0
181 * 1 1 11 11 1 1
182 */
183 sh_msiof_write(p, FCTR, 0);
184 sh_msiof_write(p, TMDR1, 0xe2000005 | (lsb_first << 24));
185 sh_msiof_write(p, RMDR1, 0x22000005 | (lsb_first << 24));
186
187 tmp = 0xa0000000;
188 tmp |= cpol << 30; /* TSCKIZ */
189 tmp |= cpol << 28; /* RSCKIZ */
190
191 edge = cpol ^ !cpha;
192
193 tmp |= edge << 27; /* TEDG */
194 tmp |= edge << 26; /* REDG */
195 tmp |= (tx_hi_z ? 2 : 0) << 22; /* TXDIZ */
196 sh_msiof_write(p, CTR, tmp);
197 }
198
199 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
200 const void *tx_buf, void *rx_buf,
201 u32 bits, u32 words)
202 {
203 u32 dr2 = ((bits - 1) << 24) | ((words - 1) << 16);
204
205 if (tx_buf)
206 sh_msiof_write(p, TMDR2, dr2);
207 else
208 sh_msiof_write(p, TMDR2, dr2 | 1);
209
210 if (rx_buf)
211 sh_msiof_write(p, RMDR2, dr2);
212
213 sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
214 }
215
216 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
217 {
218 sh_msiof_write(p, STR, sh_msiof_read(p, STR));
219 }
220
221 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
222 const void *tx_buf, int words, int fs)
223 {
224 const u8 *buf_8 = tx_buf;
225 int k;
226
227 for (k = 0; k < words; k++)
228 sh_msiof_write(p, TFDR, buf_8[k] << fs);
229 }
230
231 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
232 const void *tx_buf, int words, int fs)
233 {
234 const u16 *buf_16 = tx_buf;
235 int k;
236
237 for (k = 0; k < words; k++)
238 sh_msiof_write(p, TFDR, buf_16[k] << fs);
239 }
240
241 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
242 const void *tx_buf, int words, int fs)
243 {
244 const u16 *buf_16 = tx_buf;
245 int k;
246
247 for (k = 0; k < words; k++)
248 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
249 }
250
251 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
252 const void *tx_buf, int words, int fs)
253 {
254 const u32 *buf_32 = tx_buf;
255 int k;
256
257 for (k = 0; k < words; k++)
258 sh_msiof_write(p, TFDR, buf_32[k] << fs);
259 }
260
261 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
262 const void *tx_buf, int words, int fs)
263 {
264 const u32 *buf_32 = tx_buf;
265 int k;
266
267 for (k = 0; k < words; k++)
268 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
269 }
270
271 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
272 const void *tx_buf, int words, int fs)
273 {
274 const u32 *buf_32 = tx_buf;
275 int k;
276
277 for (k = 0; k < words; k++)
278 sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
279 }
280
281 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
282 const void *tx_buf, int words, int fs)
283 {
284 const u32 *buf_32 = tx_buf;
285 int k;
286
287 for (k = 0; k < words; k++)
288 sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
289 }
290
291 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
292 void *rx_buf, int words, int fs)
293 {
294 u8 *buf_8 = rx_buf;
295 int k;
296
297 for (k = 0; k < words; k++)
298 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
299 }
300
301 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
302 void *rx_buf, int words, int fs)
303 {
304 u16 *buf_16 = rx_buf;
305 int k;
306
307 for (k = 0; k < words; k++)
308 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
309 }
310
311 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
312 void *rx_buf, int words, int fs)
313 {
314 u16 *buf_16 = rx_buf;
315 int k;
316
317 for (k = 0; k < words; k++)
318 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
319 }
320
321 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
322 void *rx_buf, int words, int fs)
323 {
324 u32 *buf_32 = rx_buf;
325 int k;
326
327 for (k = 0; k < words; k++)
328 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
329 }
330
331 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
332 void *rx_buf, int words, int fs)
333 {
334 u32 *buf_32 = rx_buf;
335 int k;
336
337 for (k = 0; k < words; k++)
338 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
339 }
340
341 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
342 void *rx_buf, int words, int fs)
343 {
344 u32 *buf_32 = rx_buf;
345 int k;
346
347 for (k = 0; k < words; k++)
348 buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
349 }
350
351 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
352 void *rx_buf, int words, int fs)
353 {
354 u32 *buf_32 = rx_buf;
355 int k;
356
357 for (k = 0; k < words; k++)
358 put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
359 }
360
361 static int sh_msiof_spi_bits(struct spi_device *spi, struct spi_transfer *t)
362 {
363 int bits;
364
365 bits = t ? t->bits_per_word : 0;
366 if (!bits)
367 bits = spi->bits_per_word;
368 return bits;
369 }
370
371 static unsigned long sh_msiof_spi_hz(struct spi_device *spi,
372 struct spi_transfer *t)
373 {
374 unsigned long hz;
375
376 hz = t ? t->speed_hz : 0;
377 if (!hz)
378 hz = spi->max_speed_hz;
379 return hz;
380 }
381
382 static int sh_msiof_spi_setup_transfer(struct spi_device *spi,
383 struct spi_transfer *t)
384 {
385 int bits;
386
387 /* noting to check hz values against since parent clock is disabled */
388
389 bits = sh_msiof_spi_bits(spi, t);
390 if (bits < 8)
391 return -EINVAL;
392 if (bits > 32)
393 return -EINVAL;
394
395 return spi_bitbang_setup_transfer(spi, t);
396 }
397
398 static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
399 {
400 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
401 int value;
402
403 /* chip select is active low unless SPI_CS_HIGH is set */
404 if (spi->mode & SPI_CS_HIGH)
405 value = (is_on == BITBANG_CS_ACTIVE) ? 1 : 0;
406 else
407 value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1;
408
409 if (is_on == BITBANG_CS_ACTIVE) {
410 if (!test_and_set_bit(0, &p->flags)) {
411 pm_runtime_get_sync(&p->pdev->dev);
412 clk_enable(p->clk);
413 }
414
415 /* Configure pins before asserting CS */
416 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
417 !!(spi->mode & SPI_CPHA),
418 !!(spi->mode & SPI_3WIRE),
419 !!(spi->mode & SPI_LSB_FIRST));
420 }
421
422 /* use spi->controller data for CS (same strategy as spi_gpio) */
423 gpio_set_value((unsigned)spi->controller_data, value);
424
425 if (is_on == BITBANG_CS_INACTIVE) {
426 if (test_and_clear_bit(0, &p->flags)) {
427 clk_disable(p->clk);
428 pm_runtime_put(&p->pdev->dev);
429 }
430 }
431 }
432
433 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
434 void (*tx_fifo)(struct sh_msiof_spi_priv *,
435 const void *, int, int),
436 void (*rx_fifo)(struct sh_msiof_spi_priv *,
437 void *, int, int),
438 const void *tx_buf, void *rx_buf,
439 int words, int bits)
440 {
441 int fifo_shift;
442 int ret;
443
444 /* limit maximum word transfer to rx/tx fifo size */
445 if (tx_buf)
446 words = min_t(int, words, p->tx_fifo_size);
447 if (rx_buf)
448 words = min_t(int, words, p->rx_fifo_size);
449
450 /* the fifo contents need shifting */
451 fifo_shift = 32 - bits;
452
453 /* setup msiof transfer mode registers */
454 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
455
456 /* write tx fifo */
457 if (tx_buf)
458 tx_fifo(p, tx_buf, words, fifo_shift);
459
460 /* setup clock and rx/tx signals */
461 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
462 if (rx_buf)
463 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
464 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
465
466 /* start by setting frame bit */
467 INIT_COMPLETION(p->done);
468 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
469 if (ret) {
470 dev_err(&p->pdev->dev, "failed to start hardware\n");
471 goto err;
472 }
473
474 /* wait for tx fifo to be emptied / rx fifo to be filled */
475 wait_for_completion(&p->done);
476
477 /* read rx fifo */
478 if (rx_buf)
479 rx_fifo(p, rx_buf, words, fifo_shift);
480
481 /* clear status bits */
482 sh_msiof_reset_str(p);
483
484 /* shut down frame, tx/tx and clock signals */
485 ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
486 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
487 if (rx_buf)
488 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
489 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
490 if (ret) {
491 dev_err(&p->pdev->dev, "failed to shut down hardware\n");
492 goto err;
493 }
494
495 return words;
496
497 err:
498 sh_msiof_write(p, IER, 0);
499 return ret;
500 }
501
502 static int sh_msiof_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
503 {
504 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
505 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
506 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
507 int bits;
508 int bytes_per_word;
509 int bytes_done;
510 int words;
511 int n;
512 bool swab;
513
514 bits = sh_msiof_spi_bits(spi, t);
515
516 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
517 bits = 32;
518 swab = true;
519 } else {
520 swab = false;
521 }
522
523 /* setup bytes per word and fifo read/write functions */
524 if (bits <= 8) {
525 bytes_per_word = 1;
526 tx_fifo = sh_msiof_spi_write_fifo_8;
527 rx_fifo = sh_msiof_spi_read_fifo_8;
528 } else if (bits <= 16) {
529 bytes_per_word = 2;
530 if ((unsigned long)t->tx_buf & 0x01)
531 tx_fifo = sh_msiof_spi_write_fifo_16u;
532 else
533 tx_fifo = sh_msiof_spi_write_fifo_16;
534
535 if ((unsigned long)t->rx_buf & 0x01)
536 rx_fifo = sh_msiof_spi_read_fifo_16u;
537 else
538 rx_fifo = sh_msiof_spi_read_fifo_16;
539 } else if (swab) {
540 bytes_per_word = 4;
541 if ((unsigned long)t->tx_buf & 0x03)
542 tx_fifo = sh_msiof_spi_write_fifo_s32u;
543 else
544 tx_fifo = sh_msiof_spi_write_fifo_s32;
545
546 if ((unsigned long)t->rx_buf & 0x03)
547 rx_fifo = sh_msiof_spi_read_fifo_s32u;
548 else
549 rx_fifo = sh_msiof_spi_read_fifo_s32;
550 } else {
551 bytes_per_word = 4;
552 if ((unsigned long)t->tx_buf & 0x03)
553 tx_fifo = sh_msiof_spi_write_fifo_32u;
554 else
555 tx_fifo = sh_msiof_spi_write_fifo_32;
556
557 if ((unsigned long)t->rx_buf & 0x03)
558 rx_fifo = sh_msiof_spi_read_fifo_32u;
559 else
560 rx_fifo = sh_msiof_spi_read_fifo_32;
561 }
562
563 /* setup clocks (clock already enabled in chipselect()) */
564 sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk),
565 sh_msiof_spi_hz(spi, t));
566
567 /* transfer in fifo sized chunks */
568 words = t->len / bytes_per_word;
569 bytes_done = 0;
570
571 while (bytes_done < t->len) {
572 void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
573 const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
574 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
575 tx_buf,
576 rx_buf,
577 words, bits);
578 if (n < 0)
579 break;
580
581 bytes_done += n * bytes_per_word;
582 words -= n;
583 }
584
585 return bytes_done;
586 }
587
588 static u32 sh_msiof_spi_txrx_word(struct spi_device *spi, unsigned nsecs,
589 u32 word, u8 bits)
590 {
591 BUG(); /* unused but needed by bitbang code */
592 return 0;
593 }
594
595 static int sh_msiof_spi_probe(struct platform_device *pdev)
596 {
597 struct resource *r;
598 struct spi_master *master;
599 struct sh_msiof_spi_priv *p;
600 char clk_name[16];
601 int i;
602 int ret;
603
604 master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
605 if (master == NULL) {
606 dev_err(&pdev->dev, "failed to allocate spi master\n");
607 ret = -ENOMEM;
608 goto err0;
609 }
610
611 p = spi_master_get_devdata(master);
612
613 platform_set_drvdata(pdev, p);
614 p->info = pdev->dev.platform_data;
615 init_completion(&p->done);
616
617 snprintf(clk_name, sizeof(clk_name), "msiof%d", pdev->id);
618 p->clk = clk_get(&pdev->dev, clk_name);
619 if (IS_ERR(p->clk)) {
620 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
621 ret = PTR_ERR(p->clk);
622 goto err1;
623 }
624
625 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
626 i = platform_get_irq(pdev, 0);
627 if (!r || i < 0) {
628 dev_err(&pdev->dev, "cannot get platform resources\n");
629 ret = -ENOENT;
630 goto err2;
631 }
632 p->mapbase = ioremap_nocache(r->start, resource_size(r));
633 if (!p->mapbase) {
634 dev_err(&pdev->dev, "unable to ioremap\n");
635 ret = -ENXIO;
636 goto err2;
637 }
638
639 ret = request_irq(i, sh_msiof_spi_irq, IRQF_DISABLED,
640 dev_name(&pdev->dev), p);
641 if (ret) {
642 dev_err(&pdev->dev, "unable to request irq\n");
643 goto err3;
644 }
645
646 p->pdev = pdev;
647 pm_runtime_enable(&pdev->dev);
648
649 /* The standard version of MSIOF use 64 word FIFOs */
650 p->tx_fifo_size = 64;
651 p->rx_fifo_size = 64;
652
653 /* Platform data may override FIFO sizes */
654 if (p->info->tx_fifo_override)
655 p->tx_fifo_size = p->info->tx_fifo_override;
656 if (p->info->rx_fifo_override)
657 p->rx_fifo_size = p->info->rx_fifo_override;
658
659 /* init master and bitbang code */
660 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
661 master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
662 master->flags = 0;
663 master->bus_num = pdev->id;
664 master->num_chipselect = p->info->num_chipselect;
665 master->setup = spi_bitbang_setup;
666 master->cleanup = spi_bitbang_cleanup;
667
668 p->bitbang.master = master;
669 p->bitbang.chipselect = sh_msiof_spi_chipselect;
670 p->bitbang.setup_transfer = sh_msiof_spi_setup_transfer;
671 p->bitbang.txrx_bufs = sh_msiof_spi_txrx;
672 p->bitbang.txrx_word[SPI_MODE_0] = sh_msiof_spi_txrx_word;
673 p->bitbang.txrx_word[SPI_MODE_1] = sh_msiof_spi_txrx_word;
674 p->bitbang.txrx_word[SPI_MODE_2] = sh_msiof_spi_txrx_word;
675 p->bitbang.txrx_word[SPI_MODE_3] = sh_msiof_spi_txrx_word;
676
677 ret = spi_bitbang_start(&p->bitbang);
678 if (ret == 0)
679 return 0;
680
681 pm_runtime_disable(&pdev->dev);
682 err3:
683 iounmap(p->mapbase);
684 err2:
685 clk_put(p->clk);
686 err1:
687 spi_master_put(master);
688 err0:
689 return ret;
690 }
691
692 static int sh_msiof_spi_remove(struct platform_device *pdev)
693 {
694 struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
695 int ret;
696
697 ret = spi_bitbang_stop(&p->bitbang);
698 if (!ret) {
699 pm_runtime_disable(&pdev->dev);
700 free_irq(platform_get_irq(pdev, 0), p);
701 iounmap(p->mapbase);
702 clk_put(p->clk);
703 spi_master_put(p->bitbang.master);
704 }
705 return ret;
706 }
707
708 static int sh_msiof_spi_runtime_nop(struct device *dev)
709 {
710 /* Runtime PM callback shared between ->runtime_suspend()
711 * and ->runtime_resume(). Simply returns success.
712 *
713 * This driver re-initializes all registers after
714 * pm_runtime_get_sync() anyway so there is no need
715 * to save and restore registers here.
716 */
717 return 0;
718 }
719
720 static struct dev_pm_ops sh_msiof_spi_dev_pm_ops = {
721 .runtime_suspend = sh_msiof_spi_runtime_nop,
722 .runtime_resume = sh_msiof_spi_runtime_nop,
723 };
724
725 static struct platform_driver sh_msiof_spi_drv = {
726 .probe = sh_msiof_spi_probe,
727 .remove = sh_msiof_spi_remove,
728 .driver = {
729 .name = "spi_sh_msiof",
730 .owner = THIS_MODULE,
731 .pm = &sh_msiof_spi_dev_pm_ops,
732 },
733 };
734
735 static int __init sh_msiof_spi_init(void)
736 {
737 return platform_driver_register(&sh_msiof_spi_drv);
738 }
739 module_init(sh_msiof_spi_init);
740
741 static void __exit sh_msiof_spi_exit(void)
742 {
743 platform_driver_unregister(&sh_msiof_spi_drv);
744 }
745 module_exit(sh_msiof_spi_exit);
746
747 MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
748 MODULE_AUTHOR("Magnus Damm");
749 MODULE_LICENSE("GPL v2");
750 MODULE_ALIAS("platform:spi_sh_msiof");
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