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Magnus Damm8051eff2009-11-26 11:10:05 +00001/*
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
Magnus Damm8051eff2009-11-26 11:10:05 +000012#include <linux/bitmap.h>
13#include <linux/clk.h>
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010014#include <linux/completion.h>
15#include <linux/delay.h>
Magnus Dammac48eee2010-01-20 13:49:45 -070016#include <linux/err.h>
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010017#include <linux/gpio.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/kernel.h>
Paul Gortmakerd7614de2011-07-03 15:44:29 -040022#include <linux/module.h>
Bastian Hechtcf9c86e2012-12-12 12:54:48 +010023#include <linux/of.h>
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010024#include <linux/platform_device.h>
25#include <linux/pm_runtime.h>
Magnus Damm8051eff2009-11-26 11:10:05 +000026
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010027#include <linux/spi/sh_msiof.h>
Magnus Damm8051eff2009-11-26 11:10:05 +000028#include <linux/spi/spi.h>
29#include <linux/spi/spi_bitbang.h>
Magnus Damm8051eff2009-11-26 11:10:05 +000030
Magnus Damm8051eff2009-11-26 11:10:05 +000031#include <asm/unaligned.h>
32
33struct 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
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010072static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
Magnus Damm8051eff2009-11-26 11:10:05 +000073{
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
83static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010084 u32 value)
Magnus Damm8051eff2009-11-26 11:10:05 +000085{
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
97static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +010098 u32 clr, u32 set)
Magnus Damm8051eff2009-11-26 11:10:05 +000099{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100100 u32 mask = clr | set;
101 u32 data;
Magnus Damm8051eff2009-11-26 11:10:05 +0000102 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
119static 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
130static 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
147static 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
170static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100171 u32 cpol, u32 cpha,
172 u32 tx_hi_z, u32 lsb_first)
Magnus Damm8051eff2009-11-26 11:10:05 +0000173{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100174 u32 tmp;
Magnus Damm8051eff2009-11-26 11:10:05 +0000175 int edge;
176
177 /*
Markus Pietreke8708ef2010-02-02 11:29:15 +0900178 * 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
Magnus Damm8051eff2009-11-26 11:10:05 +0000183 */
Magnus Damm8051eff2009-11-26 11:10:05 +0000184 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
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100192 edge = cpol ^ !cpha;
Magnus Damm8051eff2009-11-26 11:10:05 +0000193
194 tmp |= edge << 27; /* TEDG */
Markus Pietreke8708ef2010-02-02 11:29:15 +0900195 tmp |= edge << 26; /* REDG */
Magnus Damm8051eff2009-11-26 11:10:05 +0000196 tmp |= (tx_hi_z ? 2 : 0) << 22; /* TXDIZ */
197 sh_msiof_write(p, CTR, tmp);
198}
199
200static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
201 const void *tx_buf, void *rx_buf,
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100202 u32 bits, u32 words)
Magnus Damm8051eff2009-11-26 11:10:05 +0000203{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100204 u32 dr2 = ((bits - 1) << 24) | ((words - 1) << 16);
Magnus Damm8051eff2009-11-26 11:10:05 +0000205
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
217static 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
222static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
223 const void *tx_buf, int words, int fs)
224{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100225 const u8 *buf_8 = tx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000226 int k;
227
228 for (k = 0; k < words; k++)
229 sh_msiof_write(p, TFDR, buf_8[k] << fs);
230}
231
232static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
233 const void *tx_buf, int words, int fs)
234{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100235 const u16 *buf_16 = tx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000236 int k;
237
238 for (k = 0; k < words; k++)
239 sh_msiof_write(p, TFDR, buf_16[k] << fs);
240}
241
242static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
243 const void *tx_buf, int words, int fs)
244{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100245 const u16 *buf_16 = tx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000246 int k;
247
248 for (k = 0; k < words; k++)
249 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
250}
251
252static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
253 const void *tx_buf, int words, int fs)
254{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100255 const u32 *buf_32 = tx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000256 int k;
257
258 for (k = 0; k < words; k++)
259 sh_msiof_write(p, TFDR, buf_32[k] << fs);
260}
261
262static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
263 const void *tx_buf, int words, int fs)
264{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100265 const u32 *buf_32 = tx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000266 int k;
267
268 for (k = 0; k < words; k++)
269 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
270}
271
Guennadi Liakhovetski9dabb3f2011-01-21 16:56:42 +0100272static 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
282static 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
Magnus Damm8051eff2009-11-26 11:10:05 +0000292static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
293 void *rx_buf, int words, int fs)
294{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100295 u8 *buf_8 = rx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000296 int k;
297
298 for (k = 0; k < words; k++)
299 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
300}
301
302static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
303 void *rx_buf, int words, int fs)
304{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100305 u16 *buf_16 = rx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000306 int k;
307
308 for (k = 0; k < words; k++)
309 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
310}
311
312static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
313 void *rx_buf, int words, int fs)
314{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100315 u16 *buf_16 = rx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000316 int k;
317
318 for (k = 0; k < words; k++)
319 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
320}
321
322static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
323 void *rx_buf, int words, int fs)
324{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100325 u32 *buf_32 = rx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000326 int k;
327
328 for (k = 0; k < words; k++)
329 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
330}
331
332static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
333 void *rx_buf, int words, int fs)
334{
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100335 u32 *buf_32 = rx_buf;
Magnus Damm8051eff2009-11-26 11:10:05 +0000336 int k;
337
338 for (k = 0; k < words; k++)
339 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
340}
341
Guennadi Liakhovetski9dabb3f2011-01-21 16:56:42 +0100342static 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
352static 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
Magnus Damm8051eff2009-11-26 11:10:05 +0000362static 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;
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100367 if (!bits)
368 bits = spi->bits_per_word;
Magnus Damm8051eff2009-11-26 11:10:05 +0000369 return bits;
370}
371
372static 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;
Guennadi Liakhovetskie2dbf5e2011-01-21 16:56:37 +0100378 if (!hz)
379 hz = spi->max_speed_hz;
Magnus Damm8051eff2009-11-26 11:10:05 +0000380 return hz;
381}
382
383static 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
399static 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
434static 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
503static 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;
Guennadi Liakhovetski9dabb3f2011-01-21 16:56:42 +0100513 bool swab;
Magnus Damm8051eff2009-11-26 11:10:05 +0000514
515 bits = sh_msiof_spi_bits(spi, t);
516
Guennadi Liakhovetski9dabb3f2011-01-21 16:56:42 +0100517 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
518 bits = 32;
519 swab = true;
520 } else {
521 swab = false;
522 }
523
Magnus Damm8051eff2009-11-26 11:10:05 +0000524 /* 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;
Guennadi Liakhovetski9dabb3f2011-01-21 16:56:42 +0100540 } 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;
Magnus Damm8051eff2009-11-26 11:10:05 +0000551 } 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) {
Guennadi Liakhovetski8a6afb92011-01-21 16:56:47 +0100573 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;
Magnus Damm8051eff2009-11-26 11:10:05 +0000575 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
Guennadi Liakhovetski8a6afb92011-01-21 16:56:47 +0100576 tx_buf,
577 rx_buf,
Magnus Damm8051eff2009-11-26 11:10:05 +0000578 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
589static 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
Bastian Hechtcf9c86e2012-12-12 12:54:48 +0100596#ifdef CONFIG_OF
597static 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
621static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
622{
623 return NULL;
624}
625#endif
626
Magnus Damm8051eff2009-11-26 11:10:05 +0000627static 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;
Magnus Damm8051eff2009-11-26 11:10:05 +0000632 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);
Bastian Hechtcf9c86e2012-12-12 12:54:48 +0100645 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
Magnus Damm8051eff2009-11-26 11:10:05 +0000656 init_completion(&p->done);
657
Bastian Hecht078b6ea2012-11-07 12:40:04 +0100658 p->clk = clk_get(&pdev->dev, NULL);
Magnus Damm8051eff2009-11-26 11:10:05 +0000659 if (IS_ERR(p->clk)) {
Bastian Hecht078b6ea2012-11-07 12:40:04 +0100660 dev_err(&pdev->dev, "cannot get clock\n");
Magnus Damm8051eff2009-11-26 11:10:05 +0000661 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
Yong Zhang38ada212011-10-22 17:56:55 +0800679 ret = request_irq(i, sh_msiof_spi_irq, 0,
Magnus Damm8051eff2009-11-26 11:10:05 +0000680 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
732static 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);
Guennadi Liakhovetskid95defa2011-01-17 17:01:07 +0100740 free_irq(platform_get_irq(pdev, 0), p);
Magnus Damm8051eff2009-11-26 11:10:05 +0000741 iounmap(p->mapbase);
742 clk_put(p->clk);
743 spi_master_put(p->bitbang.master);
744 }
745 return ret;
746}
747
748static 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
Bastian Hechtcf9c86e2012-12-12 12:54:48 +0100760#ifdef CONFIG_OF
761static const struct of_device_id sh_msiof_match[] = {
762 { .compatible = "renesas,sh-msiof", },
763 { .compatible = "renesas,sh-mobile-msiof", },
764 {},
765};
766MODULE_DEVICE_TABLE(of, sh_msiof_match);
Bastian Hechtcf9c86e2012-12-12 12:54:48 +0100767#endif
768
Magnus Damm8051eff2009-11-26 11:10:05 +0000769static struct dev_pm_ops sh_msiof_spi_dev_pm_ops = {
770 .runtime_suspend = sh_msiof_spi_runtime_nop,
771 .runtime_resume = sh_msiof_spi_runtime_nop,
772};
773
774static struct platform_driver sh_msiof_spi_drv = {
775 .probe = sh_msiof_spi_probe,
776 .remove = sh_msiof_spi_remove,
777 .driver = {
778 .name = "spi_sh_msiof",
779 .owner = THIS_MODULE,
780 .pm = &sh_msiof_spi_dev_pm_ops,
Sachin Kamat691ee4e2013-03-14 15:31:51 +0530781 .of_match_table = of_match_ptr(sh_msiof_match),
Magnus Damm8051eff2009-11-26 11:10:05 +0000782 },
783};
Grant Likely940ab882011-10-05 11:29:49 -0600784module_platform_driver(sh_msiof_spi_drv);
Magnus Damm8051eff2009-11-26 11:10:05 +0000785
786MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
787MODULE_AUTHOR("Magnus Damm");
788MODULE_LICENSE("GPL v2");
789MODULE_ALIAS("platform:spi_sh_msiof");