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thermal: Fix compiler warning
[linux-2.6/btrfs-unstable.git] / drivers / spi / spi-sh-msiof.c
blob8b40d0884f8bfc1f2eb3a2d744cc3ec8feb607e9
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/of.h>
24 #include <linux/platform_device.h>
25 #include <linux/pm_runtime.h>
26
27 #include <linux/spi/sh_msiof.h>
28 #include <linux/spi/spi.h>
29 #include <linux/spi/spi_bitbang.h>
30
31 #include <asm/unaligned.h>
32
33 struct sh_msiof_spi_priv {
34 struct spi_bitbang bitbang; /* must be first for spi_bitbang.c */
35 void __iomem *mapbase;
36 struct clk *clk;
37 struct platform_device *pdev;
38 struct sh_msiof_spi_info *info;
39 struct completion done;
40 unsigned long flags;
41 int tx_fifo_size;
42 int rx_fifo_size;
43 };
44
45 #define TMDR1 0x00
46 #define TMDR2 0x04
47 #define TMDR3 0x08
48 #define RMDR1 0x10
49 #define RMDR2 0x14
50 #define RMDR3 0x18
51 #define TSCR 0x20
52 #define RSCR 0x22
53 #define CTR 0x28
54 #define FCTR 0x30
55 #define STR 0x40
56 #define IER 0x44
57 #define TDR1 0x48
58 #define TDR2 0x4c
59 #define TFDR 0x50
60 #define RDR1 0x58
61 #define RDR2 0x5c
62 #define RFDR 0x60
63
64 #define CTR_TSCKE (1 << 15)
65 #define CTR_TFSE (1 << 14)
66 #define CTR_TXE (1 << 9)
67 #define CTR_RXE (1 << 8)
68
69 #define STR_TEOF (1 << 23)
70 #define STR_REOF (1 << 7)
71
72 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
73 {
74 switch (reg_offs) {
75 case TSCR:
76 case RSCR:
77 return ioread16(p->mapbase + reg_offs);
78 default:
79 return ioread32(p->mapbase + reg_offs);
80 }
81 }
82
83 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
84 u32 value)
85 {
86 switch (reg_offs) {
87 case TSCR:
88 case RSCR:
89 iowrite16(value, p->mapbase + reg_offs);
90 break;
91 default:
92 iowrite32(value, p->mapbase + reg_offs);
93 break;
94 }
95 }
96
97 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
98 u32 clr, u32 set)
99 {
100 u32 mask = clr | set;
101 u32 data;
102 int k;
103
104 data = sh_msiof_read(p, CTR);
105 data &= ~clr;
106 data |= set;
107 sh_msiof_write(p, CTR, data);
108
109 for (k = 100; k > 0; k--) {
110 if ((sh_msiof_read(p, CTR) & mask) == set)
111 break;
112
113 udelay(10);
114 }
115
116 return k > 0 ? 0 : -ETIMEDOUT;
117 }
118
119 static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
120 {
121 struct sh_msiof_spi_priv *p = data;
122
123 /* just disable the interrupt and wake up */
124 sh_msiof_write(p, IER, 0);
125 complete(&p->done);
126
127 return IRQ_HANDLED;
128 }
129
130 static struct {
131 unsigned short div;
132 unsigned short scr;
133 } const sh_msiof_spi_clk_table[] = {
134 { 1, 0x0007 },
135 { 2, 0x0000 },
136 { 4, 0x0001 },
137 { 8, 0x0002 },
138 { 16, 0x0003 },
139 { 32, 0x0004 },
140 { 64, 0x1f00 },
141 { 128, 0x1f01 },
142 { 256, 0x1f02 },
143 { 512, 0x1f03 },
144 { 1024, 0x1f04 },
145 };
146
147 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
148 unsigned long parent_rate,
149 unsigned long spi_hz)
150 {
151 unsigned long div = 1024;
152 size_t k;
153
154 if (!WARN_ON(!spi_hz || !parent_rate))
155 div = parent_rate / spi_hz;
156
157 /* TODO: make more fine grained */
158
159 for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
160 if (sh_msiof_spi_clk_table[k].div >= div)
161 break;
162 }
163
164 k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
165
166 sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
167 sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
168 }
169
170 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
171 u32 cpol, u32 cpha,
172 u32 tx_hi_z, u32 lsb_first)
173 {
174 u32 tmp;
175 int edge;
176
177 /*
178 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
179 * 0 0 10 10 1 1
180 * 0 1 10 10 0 0
181 * 1 0 11 11 0 0
182 * 1 1 11 11 1 1
183 */
184 sh_msiof_write(p, FCTR, 0);
185 sh_msiof_write(p, TMDR1, 0xe2000005 | (lsb_first << 24));
186 sh_msiof_write(p, RMDR1, 0x22000005 | (lsb_first << 24));
187
188 tmp = 0xa0000000;
189 tmp |= cpol << 30; /* TSCKIZ */
190 tmp |= cpol << 28; /* RSCKIZ */
191
192 edge = cpol ^ !cpha;
193
194 tmp |= edge << 27; /* TEDG */
195 tmp |= edge << 26; /* REDG */
196 tmp |= (tx_hi_z ? 2 : 0) << 22; /* TXDIZ */
197 sh_msiof_write(p, CTR, tmp);
198 }
199
200 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
201 const void *tx_buf, void *rx_buf,
202 u32 bits, u32 words)
203 {
204 u32 dr2 = ((bits - 1) << 24) | ((words - 1) << 16);
205
206 if (tx_buf)
207 sh_msiof_write(p, TMDR2, dr2);
208 else
209 sh_msiof_write(p, TMDR2, dr2 | 1);
210
211 if (rx_buf)
212 sh_msiof_write(p, RMDR2, dr2);
213
214 sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
215 }
216
217 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
218 {
219 sh_msiof_write(p, STR, sh_msiof_read(p, STR));
220 }
221
222 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
223 const void *tx_buf, int words, int fs)
224 {
225 const u8 *buf_8 = tx_buf;
226 int k;
227
228 for (k = 0; k < words; k++)
229 sh_msiof_write(p, TFDR, buf_8[k] << fs);
230 }
231
232 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
233 const void *tx_buf, int words, int fs)
234 {
235 const u16 *buf_16 = tx_buf;
236 int k;
237
238 for (k = 0; k < words; k++)
239 sh_msiof_write(p, TFDR, buf_16[k] << fs);
240 }
241
242 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
243 const void *tx_buf, int words, int fs)
244 {
245 const u16 *buf_16 = tx_buf;
246 int k;
247
248 for (k = 0; k < words; k++)
249 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
250 }
251
252 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
253 const void *tx_buf, int words, int fs)
254 {
255 const u32 *buf_32 = tx_buf;
256 int k;
257
258 for (k = 0; k < words; k++)
259 sh_msiof_write(p, TFDR, buf_32[k] << fs);
260 }
261
262 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
263 const void *tx_buf, int words, int fs)
264 {
265 const u32 *buf_32 = tx_buf;
266 int k;
267
268 for (k = 0; k < words; k++)
269 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
270 }
271
272 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
273 const void *tx_buf, int words, int fs)
274 {
275 const u32 *buf_32 = tx_buf;
276 int k;
277
278 for (k = 0; k < words; k++)
279 sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
280 }
281
282 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
283 const void *tx_buf, int words, int fs)
284 {
285 const u32 *buf_32 = tx_buf;
286 int k;
287
288 for (k = 0; k < words; k++)
289 sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
290 }
291
292 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
293 void *rx_buf, int words, int fs)
294 {
295 u8 *buf_8 = rx_buf;
296 int k;
297
298 for (k = 0; k < words; k++)
299 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
300 }
301
302 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
303 void *rx_buf, int words, int fs)
304 {
305 u16 *buf_16 = rx_buf;
306 int k;
307
308 for (k = 0; k < words; k++)
309 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
310 }
311
312 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
313 void *rx_buf, int words, int fs)
314 {
315 u16 *buf_16 = rx_buf;
316 int k;
317
318 for (k = 0; k < words; k++)
319 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
320 }
321
322 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
323 void *rx_buf, int words, int fs)
324 {
325 u32 *buf_32 = rx_buf;
326 int k;
327
328 for (k = 0; k < words; k++)
329 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
330 }
331
332 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
333 void *rx_buf, int words, int fs)
334 {
335 u32 *buf_32 = rx_buf;
336 int k;
337
338 for (k = 0; k < words; k++)
339 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
340 }
341
342 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
343 void *rx_buf, int words, int fs)
344 {
345 u32 *buf_32 = rx_buf;
346 int k;
347
348 for (k = 0; k < words; k++)
349 buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
350 }
351
352 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
353 void *rx_buf, int words, int fs)
354 {
355 u32 *buf_32 = rx_buf;
356 int k;
357
358 for (k = 0; k < words; k++)
359 put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
360 }
361
362 static int sh_msiof_spi_bits(struct spi_device *spi, struct spi_transfer *t)
363 {
364 int bits;
365
366 bits = t ? t->bits_per_word : 0;
367 if (!bits)
368 bits = spi->bits_per_word;
369 return bits;
370 }
371
372 static unsigned long sh_msiof_spi_hz(struct spi_device *spi,
373 struct spi_transfer *t)
374 {
375 unsigned long hz;
376
377 hz = t ? t->speed_hz : 0;
378 if (!hz)
379 hz = spi->max_speed_hz;
380 return hz;
381 }
382
383 static int sh_msiof_spi_setup_transfer(struct spi_device *spi,
384 struct spi_transfer *t)
385 {
386 int bits;
387
388 /* noting to check hz values against since parent clock is disabled */
389
390 bits = sh_msiof_spi_bits(spi, t);
391 if (bits < 8)
392 return -EINVAL;
393 if (bits > 32)
394 return -EINVAL;
395
396 return spi_bitbang_setup_transfer(spi, t);
397 }
398
399 static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
400 {
401 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
402 int value;
403
404 /* chip select is active low unless SPI_CS_HIGH is set */
405 if (spi->mode & SPI_CS_HIGH)
406 value = (is_on == BITBANG_CS_ACTIVE) ? 1 : 0;
407 else
408 value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1;
409
410 if (is_on == BITBANG_CS_ACTIVE) {
411 if (!test_and_set_bit(0, &p->flags)) {
412 pm_runtime_get_sync(&p->pdev->dev);
413 clk_enable(p->clk);
414 }
415
416 /* Configure pins before asserting CS */
417 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
418 !!(spi->mode & SPI_CPHA),
419 !!(spi->mode & SPI_3WIRE),
420 !!(spi->mode & SPI_LSB_FIRST));
421 }
422
423 /* use spi->controller data for CS (same strategy as spi_gpio) */
424 gpio_set_value((unsigned)spi->controller_data, value);
425
426 if (is_on == BITBANG_CS_INACTIVE) {
427 if (test_and_clear_bit(0, &p->flags)) {
428 clk_disable(p->clk);
429 pm_runtime_put(&p->pdev->dev);
430 }
431 }
432 }
433
434 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
435 void (*tx_fifo)(struct sh_msiof_spi_priv *,
436 const void *, int, int),
437 void (*rx_fifo)(struct sh_msiof_spi_priv *,
438 void *, int, int),
439 const void *tx_buf, void *rx_buf,
440 int words, int bits)
441 {
442 int fifo_shift;
443 int ret;
444
445 /* limit maximum word transfer to rx/tx fifo size */
446 if (tx_buf)
447 words = min_t(int, words, p->tx_fifo_size);
448 if (rx_buf)
449 words = min_t(int, words, p->rx_fifo_size);
450
451 /* the fifo contents need shifting */
452 fifo_shift = 32 - bits;
453
454 /* setup msiof transfer mode registers */
455 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
456
457 /* write tx fifo */
458 if (tx_buf)
459 tx_fifo(p, tx_buf, words, fifo_shift);
460
461 /* setup clock and rx/tx signals */
462 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
463 if (rx_buf)
464 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
465 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
466
467 /* start by setting frame bit */
468 INIT_COMPLETION(p->done);
469 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
470 if (ret) {
471 dev_err(&p->pdev->dev, "failed to start hardware\n");
472 goto err;
473 }
474
475 /* wait for tx fifo to be emptied / rx fifo to be filled */
476 wait_for_completion(&p->done);
477
478 /* read rx fifo */
479 if (rx_buf)
480 rx_fifo(p, rx_buf, words, fifo_shift);
481
482 /* clear status bits */
483 sh_msiof_reset_str(p);
484
485 /* shut down frame, tx/tx and clock signals */
486 ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
487 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
488 if (rx_buf)
489 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
490 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
491 if (ret) {
492 dev_err(&p->pdev->dev, "failed to shut down hardware\n");
493 goto err;
494 }
495
496 return words;
497
498 err:
499 sh_msiof_write(p, IER, 0);
500 return ret;
501 }
502
503 static int sh_msiof_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
504 {
505 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
506 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
507 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
508 int bits;
509 int bytes_per_word;
510 int bytes_done;
511 int words;
512 int n;
513 bool swab;
514
515 bits = sh_msiof_spi_bits(spi, t);
516
517 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
518 bits = 32;
519 swab = true;
520 } else {
521 swab = false;
522 }
523
524 /* setup bytes per word and fifo read/write functions */
525 if (bits <= 8) {
526 bytes_per_word = 1;
527 tx_fifo = sh_msiof_spi_write_fifo_8;
528 rx_fifo = sh_msiof_spi_read_fifo_8;
529 } else if (bits <= 16) {
530 bytes_per_word = 2;
531 if ((unsigned long)t->tx_buf & 0x01)
532 tx_fifo = sh_msiof_spi_write_fifo_16u;
533 else
534 tx_fifo = sh_msiof_spi_write_fifo_16;
535
536 if ((unsigned long)t->rx_buf & 0x01)
537 rx_fifo = sh_msiof_spi_read_fifo_16u;
538 else
539 rx_fifo = sh_msiof_spi_read_fifo_16;
540 } else if (swab) {
541 bytes_per_word = 4;
542 if ((unsigned long)t->tx_buf & 0x03)
543 tx_fifo = sh_msiof_spi_write_fifo_s32u;
544 else
545 tx_fifo = sh_msiof_spi_write_fifo_s32;
546
547 if ((unsigned long)t->rx_buf & 0x03)
548 rx_fifo = sh_msiof_spi_read_fifo_s32u;
549 else
550 rx_fifo = sh_msiof_spi_read_fifo_s32;
551 } else {
552 bytes_per_word = 4;
553 if ((unsigned long)t->tx_buf & 0x03)
554 tx_fifo = sh_msiof_spi_write_fifo_32u;
555 else
556 tx_fifo = sh_msiof_spi_write_fifo_32;
557
558 if ((unsigned long)t->rx_buf & 0x03)
559 rx_fifo = sh_msiof_spi_read_fifo_32u;
560 else
561 rx_fifo = sh_msiof_spi_read_fifo_32;
562 }
563
564 /* setup clocks (clock already enabled in chipselect()) */
565 sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk),
566 sh_msiof_spi_hz(spi, t));
567
568 /* transfer in fifo sized chunks */
569 words = t->len / bytes_per_word;
570 bytes_done = 0;
571
572 while (bytes_done < t->len) {
573 void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
574 const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
575 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
576 tx_buf,
577 rx_buf,
578 words, bits);
579 if (n < 0)
580 break;
581
582 bytes_done += n * bytes_per_word;
583 words -= n;
584 }
585
586 return bytes_done;
587 }
588
589 static u32 sh_msiof_spi_txrx_word(struct spi_device *spi, unsigned nsecs,
590 u32 word, u8 bits)
591 {
592 BUG(); /* unused but needed by bitbang code */
593 return 0;
594 }
595
596 #ifdef CONFIG_OF
597 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
598 {
599 struct sh_msiof_spi_info *info;
600 struct device_node *np = dev->of_node;
601 u32 num_cs = 0;
602
603 info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
604 if (!info) {
605 dev_err(dev, "failed to allocate setup data\n");
606 return NULL;
607 }
608
609 /* Parse the MSIOF properties */
610 of_property_read_u32(np, "num-cs", &num_cs);
611 of_property_read_u32(np, "renesas,tx-fifo-size",
612 &info->tx_fifo_override);
613 of_property_read_u32(np, "renesas,rx-fifo-size",
614 &info->rx_fifo_override);
615
616 info->num_chipselect = num_cs;
617
618 return info;
619 }
620 #else
621 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
622 {
623 return NULL;
624 }
625 #endif
626
627 static int sh_msiof_spi_probe(struct platform_device *pdev)
628 {
629 struct resource *r;
630 struct spi_master *master;
631 struct sh_msiof_spi_priv *p;
632 int i;
633 int ret;
634
635 master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
636 if (master == NULL) {
637 dev_err(&pdev->dev, "failed to allocate spi master\n");
638 ret = -ENOMEM;
639 goto err0;
640 }
641
642 p = spi_master_get_devdata(master);
643
644 platform_set_drvdata(pdev, p);
645 if (pdev->dev.of_node)
646 p->info = sh_msiof_spi_parse_dt(&pdev->dev);
647 else
648 p->info = pdev->dev.platform_data;
649
650 if (!p->info) {
651 dev_err(&pdev->dev, "failed to obtain device info\n");
652 ret = -ENXIO;
653 goto err1;
654 }
655
656 init_completion(&p->done);
657
658 p->clk = clk_get(&pdev->dev, NULL);
659 if (IS_ERR(p->clk)) {
660 dev_err(&pdev->dev, "cannot get clock\n");
661 ret = PTR_ERR(p->clk);
662 goto err1;
663 }
664
665 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
666 i = platform_get_irq(pdev, 0);
667 if (!r || i < 0) {
668 dev_err(&pdev->dev, "cannot get platform resources\n");
669 ret = -ENOENT;
670 goto err2;
671 }
672 p->mapbase = ioremap_nocache(r->start, resource_size(r));
673 if (!p->mapbase) {
674 dev_err(&pdev->dev, "unable to ioremap\n");
675 ret = -ENXIO;
676 goto err2;
677 }
678
679 ret = request_irq(i, sh_msiof_spi_irq, 0,
680 dev_name(&pdev->dev), p);
681 if (ret) {
682 dev_err(&pdev->dev, "unable to request irq\n");
683 goto err3;
684 }
685
686 p->pdev = pdev;
687 pm_runtime_enable(&pdev->dev);
688
689 /* The standard version of MSIOF use 64 word FIFOs */
690 p->tx_fifo_size = 64;
691 p->rx_fifo_size = 64;
692
693 /* Platform data may override FIFO sizes */
694 if (p->info->tx_fifo_override)
695 p->tx_fifo_size = p->info->tx_fifo_override;
696 if (p->info->rx_fifo_override)
697 p->rx_fifo_size = p->info->rx_fifo_override;
698
699 /* init master and bitbang code */
700 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
701 master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
702 master->flags = 0;
703 master->bus_num = pdev->id;
704 master->num_chipselect = p->info->num_chipselect;
705 master->setup = spi_bitbang_setup;
706 master->cleanup = spi_bitbang_cleanup;
707
708 p->bitbang.master = master;
709 p->bitbang.chipselect = sh_msiof_spi_chipselect;
710 p->bitbang.setup_transfer = sh_msiof_spi_setup_transfer;
711 p->bitbang.txrx_bufs = sh_msiof_spi_txrx;
712 p->bitbang.txrx_word[SPI_MODE_0] = sh_msiof_spi_txrx_word;
713 p->bitbang.txrx_word[SPI_MODE_1] = sh_msiof_spi_txrx_word;
714 p->bitbang.txrx_word[SPI_MODE_2] = sh_msiof_spi_txrx_word;
715 p->bitbang.txrx_word[SPI_MODE_3] = sh_msiof_spi_txrx_word;
716
717 ret = spi_bitbang_start(&p->bitbang);
718 if (ret == 0)
719 return 0;
720
721 pm_runtime_disable(&pdev->dev);
722 err3:
723 iounmap(p->mapbase);
724 err2:
725 clk_put(p->clk);
726 err1:
727 spi_master_put(master);
728 err0:
729 return ret;
730 }
731
732 static int sh_msiof_spi_remove(struct platform_device *pdev)
733 {
734 struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
735 int ret;
736
737 ret = spi_bitbang_stop(&p->bitbang);
738 if (!ret) {
739 pm_runtime_disable(&pdev->dev);
740 free_irq(platform_get_irq(pdev, 0), p);
741 iounmap(p->mapbase);
742 clk_put(p->clk);
743 spi_master_put(p->bitbang.master);
744 }
745 return ret;
746 }
747
748 static int sh_msiof_spi_runtime_nop(struct device *dev)
749 {
750 /* Runtime PM callback shared between ->runtime_suspend()
751 * and ->runtime_resume(). Simply returns success.
752 *
753 * This driver re-initializes all registers after
754 * pm_runtime_get_sync() anyway so there is no need
755 * to save and restore registers here.
756 */
757 return 0;
758 }
759
760 #ifdef CONFIG_OF
761 static const struct of_device_id sh_msiof_match[] = {
762 { .compatible = "renesas,sh-msiof", },
763 { .compatible = "renesas,sh-mobile-msiof", },
764 {},
765 };
766 MODULE_DEVICE_TABLE(of, sh_msiof_match);
767 #else
768 #define sh_msiof_match NULL
769 #endif
770
771 static struct dev_pm_ops sh_msiof_spi_dev_pm_ops = {
772 .runtime_suspend = sh_msiof_spi_runtime_nop,
773 .runtime_resume = sh_msiof_spi_runtime_nop,
774 };
775
776 static struct platform_driver sh_msiof_spi_drv = {
777 .probe = sh_msiof_spi_probe,
778 .remove = sh_msiof_spi_remove,
779 .driver = {
780 .name = "spi_sh_msiof",
781 .owner = THIS_MODULE,
782 .pm = &sh_msiof_spi_dev_pm_ops,
783 .of_match_table = sh_msiof_match,
784 },
785 };
786 module_platform_driver(sh_msiof_spi_drv);
787
788 MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
789 MODULE_AUTHOR("Magnus Damm");
790 MODULE_LICENSE("GPL v2");
791 MODULE_ALIAS("platform:spi_sh_msiof");
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