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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / host / jz4740_mmc.c
blobc8852a8128a90c119d7d53c5eec5381aa9678008
1 /*
2 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 SD/MMC controller driver
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16 #include <linux/mmc/host.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19 #include <linux/irq.h>
20 #include <linux/interrupt.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/delay.h>
24 #include <linux/scatterlist.h>
25 #include <linux/clk.h>
26
27 #include <linux/bitops.h>
28 #include <linux/gpio.h>
29 #include <asm/mach-jz4740/gpio.h>
30 #include <asm/cacheflush.h>
31 #include <linux/dma-mapping.h>
32
33 #include <asm/mach-jz4740/jz4740_mmc.h>
34
35 #define JZ_REG_MMC_STRPCL 0x00
36 #define JZ_REG_MMC_STATUS 0x04
37 #define JZ_REG_MMC_CLKRT 0x08
38 #define JZ_REG_MMC_CMDAT 0x0C
39 #define JZ_REG_MMC_RESTO 0x10
40 #define JZ_REG_MMC_RDTO 0x14
41 #define JZ_REG_MMC_BLKLEN 0x18
42 #define JZ_REG_MMC_NOB 0x1C
43 #define JZ_REG_MMC_SNOB 0x20
44 #define JZ_REG_MMC_IMASK 0x24
45 #define JZ_REG_MMC_IREG 0x28
46 #define JZ_REG_MMC_CMD 0x2C
47 #define JZ_REG_MMC_ARG 0x30
48 #define JZ_REG_MMC_RESP_FIFO 0x34
49 #define JZ_REG_MMC_RXFIFO 0x38
50 #define JZ_REG_MMC_TXFIFO 0x3C
51
52 #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
53 #define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
54 #define JZ_MMC_STRPCL_START_READWAIT BIT(5)
55 #define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
56 #define JZ_MMC_STRPCL_RESET BIT(3)
57 #define JZ_MMC_STRPCL_START_OP BIT(2)
58 #define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
59 #define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
60 #define JZ_MMC_STRPCL_CLOCK_START BIT(1)
61
62
63 #define JZ_MMC_STATUS_IS_RESETTING BIT(15)
64 #define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
65 #define JZ_MMC_STATUS_PRG_DONE BIT(13)
66 #define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
67 #define JZ_MMC_STATUS_END_CMD_RES BIT(11)
68 #define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
69 #define JZ_MMC_STATUS_IS_READWAIT BIT(9)
70 #define JZ_MMC_STATUS_CLK_EN BIT(8)
71 #define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
72 #define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
73 #define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
74 #define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
75 #define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
76 #define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
77 #define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
78 #define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
79
80 #define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
81 #define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
82
83
84 #define JZ_MMC_CMDAT_IO_ABORT BIT(11)
85 #define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
86 #define JZ_MMC_CMDAT_DMA_EN BIT(8)
87 #define JZ_MMC_CMDAT_INIT BIT(7)
88 #define JZ_MMC_CMDAT_BUSY BIT(6)
89 #define JZ_MMC_CMDAT_STREAM BIT(5)
90 #define JZ_MMC_CMDAT_WRITE BIT(4)
91 #define JZ_MMC_CMDAT_DATA_EN BIT(3)
92 #define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
93 #define JZ_MMC_CMDAT_RSP_R1 1
94 #define JZ_MMC_CMDAT_RSP_R2 2
95 #define JZ_MMC_CMDAT_RSP_R3 3
96
97 #define JZ_MMC_IRQ_SDIO BIT(7)
98 #define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
99 #define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
100 #define JZ_MMC_IRQ_END_CMD_RES BIT(2)
101 #define JZ_MMC_IRQ_PRG_DONE BIT(1)
102 #define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
103
104
105 #define JZ_MMC_CLK_RATE 24000000
106
107 enum jz4740_mmc_state {
108 JZ4740_MMC_STATE_READ_RESPONSE,
109 JZ4740_MMC_STATE_TRANSFER_DATA,
110 JZ4740_MMC_STATE_SEND_STOP,
111 JZ4740_MMC_STATE_DONE,
112 };
113
114 struct jz4740_mmc_host {
115 struct mmc_host *mmc;
116 struct platform_device *pdev;
117 struct jz4740_mmc_platform_data *pdata;
118 struct clk *clk;
119
120 int irq;
121 int card_detect_irq;
122
123 struct resource *mem;
124 void __iomem *base;
125 struct mmc_request *req;
126 struct mmc_command *cmd;
127
128 unsigned long waiting;
129
130 uint32_t cmdat;
131
132 uint16_t irq_mask;
133
134 spinlock_t lock;
135
136 struct timer_list timeout_timer;
137 struct sg_mapping_iter miter;
138 enum jz4740_mmc_state state;
139 };
140
141 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
142 unsigned int irq, bool enabled)
143 {
144 unsigned long flags;
145
146 spin_lock_irqsave(&host->lock, flags);
147 if (enabled)
148 host->irq_mask &= ~irq;
149 else
150 host->irq_mask |= irq;
151 spin_unlock_irqrestore(&host->lock, flags);
152
153 writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
154 }
155
156 static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
157 bool start_transfer)
158 {
159 uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
160
161 if (start_transfer)
162 val |= JZ_MMC_STRPCL_START_OP;
163
164 writew(val, host->base + JZ_REG_MMC_STRPCL);
165 }
166
167 static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
168 {
169 uint32_t status;
170 unsigned int timeout = 1000;
171
172 writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
173 do {
174 status = readl(host->base + JZ_REG_MMC_STATUS);
175 } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
176 }
177
178 static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
179 {
180 uint32_t status;
181 unsigned int timeout = 1000;
182
183 writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
184 udelay(10);
185 do {
186 status = readl(host->base + JZ_REG_MMC_STATUS);
187 } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
188 }
189
190 static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
191 {
192 struct mmc_request *req;
193
194 req = host->req;
195 host->req = NULL;
196
197 mmc_request_done(host->mmc, req);
198 }
199
200 static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
201 unsigned int irq)
202 {
203 unsigned int timeout = 0x800;
204 uint16_t status;
205
206 do {
207 status = readw(host->base + JZ_REG_MMC_IREG);
208 } while (!(status & irq) && --timeout);
209
210 if (timeout == 0) {
211 set_bit(0, &host->waiting);
212 mod_timer(&host->timeout_timer, jiffies + 5*HZ);
213 jz4740_mmc_set_irq_enabled(host, irq, true);
214 return true;
215 }
216
217 return false;
218 }
219
220 static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
221 struct mmc_data *data)
222 {
223 int status;
224
225 status = readl(host->base + JZ_REG_MMC_STATUS);
226 if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
227 if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
228 host->req->cmd->error = -ETIMEDOUT;
229 data->error = -ETIMEDOUT;
230 } else {
231 host->req->cmd->error = -EIO;
232 data->error = -EIO;
233 }
234 }
235 }
236
237 static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
238 struct mmc_data *data)
239 {
240 struct sg_mapping_iter *miter = &host->miter;
241 void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
242 uint32_t *buf;
243 bool timeout;
244 size_t i, j;
245
246 while (sg_miter_next(miter)) {
247 buf = miter->addr;
248 i = miter->length / 4;
249 j = i / 8;
250 i = i & 0x7;
251 while (j) {
252 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
253 if (unlikely(timeout))
254 goto poll_timeout;
255
256 writel(buf[0], fifo_addr);
257 writel(buf[1], fifo_addr);
258 writel(buf[2], fifo_addr);
259 writel(buf[3], fifo_addr);
260 writel(buf[4], fifo_addr);
261 writel(buf[5], fifo_addr);
262 writel(buf[6], fifo_addr);
263 writel(buf[7], fifo_addr);
264 buf += 8;
265 --j;
266 }
267 if (unlikely(i)) {
268 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
269 if (unlikely(timeout))
270 goto poll_timeout;
271
272 while (i) {
273 writel(*buf, fifo_addr);
274 ++buf;
275 --i;
276 }
277 }
278 data->bytes_xfered += miter->length;
279 }
280 sg_miter_stop(miter);
281
282 return false;
283
284 poll_timeout:
285 miter->consumed = (void *)buf - miter->addr;
286 data->bytes_xfered += miter->consumed;
287 sg_miter_stop(miter);
288
289 return true;
290 }
291
292 static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
293 struct mmc_data *data)
294 {
295 struct sg_mapping_iter *miter = &host->miter;
296 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
297 uint32_t *buf;
298 uint32_t d;
299 uint16_t status;
300 size_t i, j;
301 unsigned int timeout;
302
303 while (sg_miter_next(miter)) {
304 buf = miter->addr;
305 i = miter->length;
306 j = i / 32;
307 i = i & 0x1f;
308 while (j) {
309 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
310 if (unlikely(timeout))
311 goto poll_timeout;
312
313 buf[0] = readl(fifo_addr);
314 buf[1] = readl(fifo_addr);
315 buf[2] = readl(fifo_addr);
316 buf[3] = readl(fifo_addr);
317 buf[4] = readl(fifo_addr);
318 buf[5] = readl(fifo_addr);
319 buf[6] = readl(fifo_addr);
320 buf[7] = readl(fifo_addr);
321
322 buf += 8;
323 --j;
324 }
325
326 if (unlikely(i)) {
327 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
328 if (unlikely(timeout))
329 goto poll_timeout;
330
331 while (i >= 4) {
332 *buf++ = readl(fifo_addr);
333 i -= 4;
334 }
335 if (unlikely(i > 0)) {
336 d = readl(fifo_addr);
337 memcpy(buf, &d, i);
338 }
339 }
340 data->bytes_xfered += miter->length;
341
342 /* This can go away once MIPS implements
343 * flush_kernel_dcache_page */
344 flush_dcache_page(miter->page);
345 }
346 sg_miter_stop(miter);
347
348 /* For whatever reason there is sometime one word more in the fifo then
349 * requested */
350 timeout = 1000;
351 status = readl(host->base + JZ_REG_MMC_STATUS);
352 while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
353 d = readl(fifo_addr);
354 status = readl(host->base + JZ_REG_MMC_STATUS);
355 }
356
357 return false;
358
359 poll_timeout:
360 miter->consumed = (void *)buf - miter->addr;
361 data->bytes_xfered += miter->consumed;
362 sg_miter_stop(miter);
363
364 return true;
365 }
366
367 static void jz4740_mmc_timeout(unsigned long data)
368 {
369 struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
370
371 if (!test_and_clear_bit(0, &host->waiting))
372 return;
373
374 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
375
376 host->req->cmd->error = -ETIMEDOUT;
377 jz4740_mmc_request_done(host);
378 }
379
380 static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
381 struct mmc_command *cmd)
382 {
383 int i;
384 uint16_t tmp;
385 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
386
387 if (cmd->flags & MMC_RSP_136) {
388 tmp = readw(fifo_addr);
389 for (i = 0; i < 4; ++i) {
390 cmd->resp[i] = tmp << 24;
391 tmp = readw(fifo_addr);
392 cmd->resp[i] |= tmp << 8;
393 tmp = readw(fifo_addr);
394 cmd->resp[i] |= tmp >> 8;
395 }
396 } else {
397 cmd->resp[0] = readw(fifo_addr) << 24;
398 cmd->resp[0] |= readw(fifo_addr) << 8;
399 cmd->resp[0] |= readw(fifo_addr) & 0xff;
400 }
401 }
402
403 static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
404 struct mmc_command *cmd)
405 {
406 uint32_t cmdat = host->cmdat;
407
408 host->cmdat &= ~JZ_MMC_CMDAT_INIT;
409 jz4740_mmc_clock_disable(host);
410
411 host->cmd = cmd;
412
413 if (cmd->flags & MMC_RSP_BUSY)
414 cmdat |= JZ_MMC_CMDAT_BUSY;
415
416 switch (mmc_resp_type(cmd)) {
417 case MMC_RSP_R1B:
418 case MMC_RSP_R1:
419 cmdat |= JZ_MMC_CMDAT_RSP_R1;
420 break;
421 case MMC_RSP_R2:
422 cmdat |= JZ_MMC_CMDAT_RSP_R2;
423 break;
424 case MMC_RSP_R3:
425 cmdat |= JZ_MMC_CMDAT_RSP_R3;
426 break;
427 default:
428 break;
429 }
430
431 if (cmd->data) {
432 cmdat |= JZ_MMC_CMDAT_DATA_EN;
433 if (cmd->data->flags & MMC_DATA_WRITE)
434 cmdat |= JZ_MMC_CMDAT_WRITE;
435 if (cmd->data->flags & MMC_DATA_STREAM)
436 cmdat |= JZ_MMC_CMDAT_STREAM;
437
438 writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
439 writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
440 }
441
442 writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
443 writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
444 writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
445
446 jz4740_mmc_clock_enable(host, 1);
447 }
448
449 static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
450 {
451 struct mmc_command *cmd = host->req->cmd;
452 struct mmc_data *data = cmd->data;
453 int direction;
454
455 if (data->flags & MMC_DATA_READ)
456 direction = SG_MITER_TO_SG;
457 else
458 direction = SG_MITER_FROM_SG;
459
460 sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
461 }
462
463
464 static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
465 {
466 struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
467 struct mmc_command *cmd = host->req->cmd;
468 struct mmc_request *req = host->req;
469 bool timeout = false;
470
471 if (cmd->error)
472 host->state = JZ4740_MMC_STATE_DONE;
473
474 switch (host->state) {
475 case JZ4740_MMC_STATE_READ_RESPONSE:
476 if (cmd->flags & MMC_RSP_PRESENT)
477 jz4740_mmc_read_response(host, cmd);
478
479 if (!cmd->data)
480 break;
481
482 jz_mmc_prepare_data_transfer(host);
483
484 case JZ4740_MMC_STATE_TRANSFER_DATA:
485 if (cmd->data->flags & MMC_DATA_READ)
486 timeout = jz4740_mmc_read_data(host, cmd->data);
487 else
488 timeout = jz4740_mmc_write_data(host, cmd->data);
489
490 if (unlikely(timeout)) {
491 host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
492 break;
493 }
494
495 jz4740_mmc_transfer_check_state(host, cmd->data);
496
497 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
498 if (unlikely(timeout)) {
499 host->state = JZ4740_MMC_STATE_SEND_STOP;
500 break;
501 }
502 writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
503
504 case JZ4740_MMC_STATE_SEND_STOP:
505 if (!req->stop)
506 break;
507
508 jz4740_mmc_send_command(host, req->stop);
509
510 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_PRG_DONE);
511 if (timeout) {
512 host->state = JZ4740_MMC_STATE_DONE;
513 break;
514 }
515 case JZ4740_MMC_STATE_DONE:
516 break;
517 }
518
519 if (!timeout)
520 jz4740_mmc_request_done(host);
521
522 return IRQ_HANDLED;
523 }
524
525 static irqreturn_t jz_mmc_irq(int irq, void *devid)
526 {
527 struct jz4740_mmc_host *host = devid;
528 struct mmc_command *cmd = host->cmd;
529 uint16_t irq_reg, status, tmp;
530
531 irq_reg = readw(host->base + JZ_REG_MMC_IREG);
532
533 tmp = irq_reg;
534 irq_reg &= ~host->irq_mask;
535
536 tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
537 JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
538
539 if (tmp != irq_reg)
540 writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
541
542 if (irq_reg & JZ_MMC_IRQ_SDIO) {
543 writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
544 mmc_signal_sdio_irq(host->mmc);
545 irq_reg &= ~JZ_MMC_IRQ_SDIO;
546 }
547
548 if (host->req && cmd && irq_reg) {
549 if (test_and_clear_bit(0, &host->waiting)) {
550 del_timer(&host->timeout_timer);
551
552 status = readl(host->base + JZ_REG_MMC_STATUS);
553
554 if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
555 cmd->error = -ETIMEDOUT;
556 } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
557 cmd->error = -EIO;
558 } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
559 JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
560 if (cmd->data)
561 cmd->data->error = -EIO;
562 cmd->error = -EIO;
563 } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
564 JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
565 if (cmd->data)
566 cmd->data->error = -EIO;
567 cmd->error = -EIO;
568 }
569
570 jz4740_mmc_set_irq_enabled(host, irq_reg, false);
571 writew(irq_reg, host->base + JZ_REG_MMC_IREG);
572
573 return IRQ_WAKE_THREAD;
574 }
575 }
576
577 return IRQ_HANDLED;
578 }
579
580 static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
581 {
582 int div = 0;
583 int real_rate;
584
585 jz4740_mmc_clock_disable(host);
586 clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
587
588 real_rate = clk_get_rate(host->clk);
589
590 while (real_rate > rate && div < 7) {
591 ++div;
592 real_rate >>= 1;
593 }
594
595 writew(div, host->base + JZ_REG_MMC_CLKRT);
596 return real_rate;
597 }
598
599 static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
600 {
601 struct jz4740_mmc_host *host = mmc_priv(mmc);
602
603 host->req = req;
604
605 writew(0xffff, host->base + JZ_REG_MMC_IREG);
606
607 writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
608 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
609
610 host->state = JZ4740_MMC_STATE_READ_RESPONSE;
611 set_bit(0, &host->waiting);
612 mod_timer(&host->timeout_timer, jiffies + 5*HZ);
613 jz4740_mmc_send_command(host, req->cmd);
614 }
615
616 static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
617 {
618 struct jz4740_mmc_host *host = mmc_priv(mmc);
619 if (ios->clock)
620 jz4740_mmc_set_clock_rate(host, ios->clock);
621
622 switch (ios->power_mode) {
623 case MMC_POWER_UP:
624 jz4740_mmc_reset(host);
625 if (gpio_is_valid(host->pdata->gpio_power))
626 gpio_set_value(host->pdata->gpio_power,
627 !host->pdata->power_active_low);
628 host->cmdat |= JZ_MMC_CMDAT_INIT;
629 clk_enable(host->clk);
630 break;
631 case MMC_POWER_ON:
632 break;
633 default:
634 if (gpio_is_valid(host->pdata->gpio_power))
635 gpio_set_value(host->pdata->gpio_power,
636 host->pdata->power_active_low);
637 clk_disable(host->clk);
638 break;
639 }
640
641 switch (ios->bus_width) {
642 case MMC_BUS_WIDTH_1:
643 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
644 break;
645 case MMC_BUS_WIDTH_4:
646 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
647 break;
648 default:
649 break;
650 }
651 }
652
653 static int jz4740_mmc_get_ro(struct mmc_host *mmc)
654 {
655 struct jz4740_mmc_host *host = mmc_priv(mmc);
656 if (!gpio_is_valid(host->pdata->gpio_read_only))
657 return -ENOSYS;
658
659 return gpio_get_value(host->pdata->gpio_read_only) ^
660 host->pdata->read_only_active_low;
661 }
662
663 static int jz4740_mmc_get_cd(struct mmc_host *mmc)
664 {
665 struct jz4740_mmc_host *host = mmc_priv(mmc);
666 if (!gpio_is_valid(host->pdata->gpio_card_detect))
667 return -ENOSYS;
668
669 return gpio_get_value(host->pdata->gpio_card_detect) ^
670 host->pdata->card_detect_active_low;
671 }
672
673 static irqreturn_t jz4740_mmc_card_detect_irq(int irq, void *devid)
674 {
675 struct jz4740_mmc_host *host = devid;
676
677 mmc_detect_change(host->mmc, HZ / 2);
678
679 return IRQ_HANDLED;
680 }
681
682 static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
683 {
684 struct jz4740_mmc_host *host = mmc_priv(mmc);
685 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
686 }
687
688 static const struct mmc_host_ops jz4740_mmc_ops = {
689 .request = jz4740_mmc_request,
690 .set_ios = jz4740_mmc_set_ios,
691 .get_ro = jz4740_mmc_get_ro,
692 .get_cd = jz4740_mmc_get_cd,
693 .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
694 };
695
696 static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
697 JZ_GPIO_BULK_PIN(MSC_CMD),
698 JZ_GPIO_BULK_PIN(MSC_CLK),
699 JZ_GPIO_BULK_PIN(MSC_DATA0),
700 JZ_GPIO_BULK_PIN(MSC_DATA1),
701 JZ_GPIO_BULK_PIN(MSC_DATA2),
702 JZ_GPIO_BULK_PIN(MSC_DATA3),
703 };
704
705 static int __devinit jz4740_mmc_request_gpio(struct device *dev, int gpio,
706 const char *name, bool output, int value)
707 {
708 int ret;
709
710 if (!gpio_is_valid(gpio))
711 return 0;
712
713 ret = gpio_request(gpio, name);
714 if (ret) {
715 dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
716 return ret;
717 }
718
719 if (output)
720 gpio_direction_output(gpio, value);
721 else
722 gpio_direction_input(gpio);
723
724 return 0;
725 }
726
727 static int __devinit jz4740_mmc_request_gpios(struct platform_device *pdev)
728 {
729 int ret;
730 struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
731
732 if (!pdata)
733 return 0;
734
735 ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_card_detect,
736 "MMC detect change", false, 0);
737 if (ret)
738 goto err;
739
740 ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_read_only,
741 "MMC read only", false, 0);
742 if (ret)
743 goto err_free_gpio_card_detect;
744
745 ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
746 "MMC read only", true, pdata->power_active_low);
747 if (ret)
748 goto err_free_gpio_read_only;
749
750 return 0;
751
752 err_free_gpio_read_only:
753 if (gpio_is_valid(pdata->gpio_read_only))
754 gpio_free(pdata->gpio_read_only);
755 err_free_gpio_card_detect:
756 if (gpio_is_valid(pdata->gpio_card_detect))
757 gpio_free(pdata->gpio_card_detect);
758 err:
759 return ret;
760 }
761
762 static int __devinit jz4740_mmc_request_cd_irq(struct platform_device *pdev,
763 struct jz4740_mmc_host *host)
764 {
765 struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
766
767 if (!gpio_is_valid(pdata->gpio_card_detect))
768 return 0;
769
770 host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);
771 if (host->card_detect_irq < 0) {
772 dev_warn(&pdev->dev, "Failed to get card detect irq\n");
773 return 0;
774 }
775
776 return request_irq(host->card_detect_irq, jz4740_mmc_card_detect_irq,
777 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
778 "MMC card detect", host);
779 }
780
781 static void jz4740_mmc_free_gpios(struct platform_device *pdev)
782 {
783 struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
784
785 if (!pdata)
786 return;
787
788 if (gpio_is_valid(pdata->gpio_power))
789 gpio_free(pdata->gpio_power);
790 if (gpio_is_valid(pdata->gpio_read_only))
791 gpio_free(pdata->gpio_read_only);
792 if (gpio_is_valid(pdata->gpio_card_detect))
793 gpio_free(pdata->gpio_card_detect);
794 }
795
796 static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
797 {
798 size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
799 if (host->pdata && host->pdata->data_1bit)
800 num_pins -= 3;
801
802 return num_pins;
803 }
804
805 static int __devinit jz4740_mmc_probe(struct platform_device* pdev)
806 {
807 int ret;
808 struct mmc_host *mmc;
809 struct jz4740_mmc_host *host;
810 struct jz4740_mmc_platform_data *pdata;
811
812 pdata = pdev->dev.platform_data;
813
814 mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
815 if (!mmc) {
816 dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
817 return -ENOMEM;
818 }
819
820 host = mmc_priv(mmc);
821 host->pdata = pdata;
822
823 host->irq = platform_get_irq(pdev, 0);
824 if (host->irq < 0) {
825 ret = host->irq;
826 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
827 goto err_free_host;
828 }
829
830 host->clk = clk_get(&pdev->dev, "mmc");
831 if (IS_ERR(host->clk)) {
832 ret = PTR_ERR(host->clk);
833 dev_err(&pdev->dev, "Failed to get mmc clock\n");
834 goto err_free_host;
835 }
836
837 host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
838 if (!host->mem) {
839 ret = -ENOENT;
840 dev_err(&pdev->dev, "Failed to get base platform memory\n");
841 goto err_clk_put;
842 }
843
844 host->mem = request_mem_region(host->mem->start,
845 resource_size(host->mem), pdev->name);
846 if (!host->mem) {
847 ret = -EBUSY;
848 dev_err(&pdev->dev, "Failed to request base memory region\n");
849 goto err_clk_put;
850 }
851
852 host->base = ioremap_nocache(host->mem->start, resource_size(host->mem));
853 if (!host->base) {
854 ret = -EBUSY;
855 dev_err(&pdev->dev, "Failed to ioremap base memory\n");
856 goto err_release_mem_region;
857 }
858
859 ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
860 if (ret) {
861 dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
862 goto err_iounmap;
863 }
864
865 ret = jz4740_mmc_request_gpios(pdev);
866 if (ret)
867 goto err_gpio_bulk_free;
868
869 mmc->ops = &jz4740_mmc_ops;
870 mmc->f_min = JZ_MMC_CLK_RATE / 128;
871 mmc->f_max = JZ_MMC_CLK_RATE;
872 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
873 mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
874 mmc->caps |= MMC_CAP_SDIO_IRQ;
875
876 mmc->max_blk_size = (1 << 10) - 1;
877 mmc->max_blk_count = (1 << 15) - 1;
878 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
879
880 mmc->max_segs = 128;
881 mmc->max_seg_size = mmc->max_req_size;
882
883 host->mmc = mmc;
884 host->pdev = pdev;
885 spin_lock_init(&host->lock);
886 host->irq_mask = 0xffff;
887
888 ret = jz4740_mmc_request_cd_irq(pdev, host);
889 if (ret) {
890 dev_err(&pdev->dev, "Failed to request card detect irq\n");
891 goto err_free_gpios;
892 }
893
894 ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
895 dev_name(&pdev->dev), host);
896 if (ret) {
897 dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
898 goto err_free_card_detect_irq;
899 }
900
901 jz4740_mmc_reset(host);
902 jz4740_mmc_clock_disable(host);
903 setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
904 (unsigned long)host);
905 /* It is not important when it times out, it just needs to timeout. */
906 set_timer_slack(&host->timeout_timer, HZ);
907
908 platform_set_drvdata(pdev, host);
909 ret = mmc_add_host(mmc);
910
911 if (ret) {
912 dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
913 goto err_free_irq;
914 }
915 dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
916
917 return 0;
918
919 err_free_irq:
920 free_irq(host->irq, host);
921 err_free_card_detect_irq:
922 if (host->card_detect_irq >= 0)
923 free_irq(host->card_detect_irq, host);
924 err_free_gpios:
925 jz4740_mmc_free_gpios(pdev);
926 err_gpio_bulk_free:
927 jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
928 err_iounmap:
929 iounmap(host->base);
930 err_release_mem_region:
931 release_mem_region(host->mem->start, resource_size(host->mem));
932 err_clk_put:
933 clk_put(host->clk);
934 err_free_host:
935 platform_set_drvdata(pdev, NULL);
936 mmc_free_host(mmc);
937
938 return ret;
939 }
940
941 static int __devexit jz4740_mmc_remove(struct platform_device *pdev)
942 {
943 struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
944
945 del_timer_sync(&host->timeout_timer);
946 jz4740_mmc_set_irq_enabled(host, 0xff, false);
947 jz4740_mmc_reset(host);
948
949 mmc_remove_host(host->mmc);
950
951 free_irq(host->irq, host);
952 if (host->card_detect_irq >= 0)
953 free_irq(host->card_detect_irq, host);
954
955 jz4740_mmc_free_gpios(pdev);
956 jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
957
958 iounmap(host->base);
959 release_mem_region(host->mem->start, resource_size(host->mem));
960
961 clk_put(host->clk);
962
963 platform_set_drvdata(pdev, NULL);
964 mmc_free_host(host->mmc);
965
966 return 0;
967 }
968
969 #ifdef CONFIG_PM
970
971 static int jz4740_mmc_suspend(struct device *dev)
972 {
973 struct jz4740_mmc_host *host = dev_get_drvdata(dev);
974
975 mmc_suspend_host(host->mmc);
976
977 jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
978
979 return 0;
980 }
981
982 static int jz4740_mmc_resume(struct device *dev)
983 {
984 struct jz4740_mmc_host *host = dev_get_drvdata(dev);
985
986 jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
987
988 mmc_resume_host(host->mmc);
989
990 return 0;
991 }
992
993 const struct dev_pm_ops jz4740_mmc_pm_ops = {
994 .suspend = jz4740_mmc_suspend,
995 .resume = jz4740_mmc_resume,
996 .poweroff = jz4740_mmc_suspend,
997 .restore = jz4740_mmc_resume,
998 };
999
1000 #define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
1001 #else
1002 #define JZ4740_MMC_PM_OPS NULL
1003 #endif
1004
1005 static struct platform_driver jz4740_mmc_driver = {
1006 .probe = jz4740_mmc_probe,
1007 .remove = __devexit_p(jz4740_mmc_remove),
1008 .driver = {
1009 .name = "jz4740-mmc",
1010 .owner = THIS_MODULE,
1011 .pm = JZ4740_MMC_PM_OPS,
1012 },
1013 };
1014
1015 module_platform_driver(jz4740_mmc_driver);
1016
1017 MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
1018 MODULE_LICENSE("GPL");
1019 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");