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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[deliverable/linux.git] / drivers / mmc / host / jz4740_mmc.c
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/mmc/slot-gpio.h>
18 #include <linux/err.h>
19 #include <linux/io.h>
20 #include <linux/irq.h>
21 #include <linux/interrupt.h>
22 #include <linux/module.h>
23 #include <linux/platform_device.h>
24 #include <linux/delay.h>
25 #include <linux/scatterlist.h>
26 #include <linux/clk.h>
27
28 #include <linux/bitops.h>
29 #include <linux/gpio.h>
30 #include <asm/mach-jz4740/gpio.h>
31 #include <asm/cacheflush.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/dmaengine.h>
34
35 #include <asm/mach-jz4740/dma.h>
36 #include <asm/mach-jz4740/jz4740_mmc.h>
37
38 #define JZ_REG_MMC_STRPCL 0x00
39 #define JZ_REG_MMC_STATUS 0x04
40 #define JZ_REG_MMC_CLKRT 0x08
41 #define JZ_REG_MMC_CMDAT 0x0C
42 #define JZ_REG_MMC_RESTO 0x10
43 #define JZ_REG_MMC_RDTO 0x14
44 #define JZ_REG_MMC_BLKLEN 0x18
45 #define JZ_REG_MMC_NOB 0x1C
46 #define JZ_REG_MMC_SNOB 0x20
47 #define JZ_REG_MMC_IMASK 0x24
48 #define JZ_REG_MMC_IREG 0x28
49 #define JZ_REG_MMC_CMD 0x2C
50 #define JZ_REG_MMC_ARG 0x30
51 #define JZ_REG_MMC_RESP_FIFO 0x34
52 #define JZ_REG_MMC_RXFIFO 0x38
53 #define JZ_REG_MMC_TXFIFO 0x3C
54
55 #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
56 #define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
57 #define JZ_MMC_STRPCL_START_READWAIT BIT(5)
58 #define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
59 #define JZ_MMC_STRPCL_RESET BIT(3)
60 #define JZ_MMC_STRPCL_START_OP BIT(2)
61 #define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
62 #define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
63 #define JZ_MMC_STRPCL_CLOCK_START BIT(1)
64
65
66 #define JZ_MMC_STATUS_IS_RESETTING BIT(15)
67 #define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
68 #define JZ_MMC_STATUS_PRG_DONE BIT(13)
69 #define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
70 #define JZ_MMC_STATUS_END_CMD_RES BIT(11)
71 #define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
72 #define JZ_MMC_STATUS_IS_READWAIT BIT(9)
73 #define JZ_MMC_STATUS_CLK_EN BIT(8)
74 #define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
75 #define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
76 #define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
77 #define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
78 #define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
79 #define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
80 #define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
81 #define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
82
83 #define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
84 #define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
85
86
87 #define JZ_MMC_CMDAT_IO_ABORT BIT(11)
88 #define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
89 #define JZ_MMC_CMDAT_DMA_EN BIT(8)
90 #define JZ_MMC_CMDAT_INIT BIT(7)
91 #define JZ_MMC_CMDAT_BUSY BIT(6)
92 #define JZ_MMC_CMDAT_STREAM BIT(5)
93 #define JZ_MMC_CMDAT_WRITE BIT(4)
94 #define JZ_MMC_CMDAT_DATA_EN BIT(3)
95 #define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
96 #define JZ_MMC_CMDAT_RSP_R1 1
97 #define JZ_MMC_CMDAT_RSP_R2 2
98 #define JZ_MMC_CMDAT_RSP_R3 3
99
100 #define JZ_MMC_IRQ_SDIO BIT(7)
101 #define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
102 #define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
103 #define JZ_MMC_IRQ_END_CMD_RES BIT(2)
104 #define JZ_MMC_IRQ_PRG_DONE BIT(1)
105 #define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
106
107
108 #define JZ_MMC_CLK_RATE 24000000
109
110 enum jz4740_mmc_state {
111 JZ4740_MMC_STATE_READ_RESPONSE,
112 JZ4740_MMC_STATE_TRANSFER_DATA,
113 JZ4740_MMC_STATE_SEND_STOP,
114 JZ4740_MMC_STATE_DONE,
115 };
116
117 struct jz4740_mmc_host_next {
118 int sg_len;
119 s32 cookie;
120 };
121
122 struct jz4740_mmc_host {
123 struct mmc_host *mmc;
124 struct platform_device *pdev;
125 struct jz4740_mmc_platform_data *pdata;
126 struct clk *clk;
127
128 int irq;
129 int card_detect_irq;
130
131 void __iomem *base;
132 struct resource *mem_res;
133 struct mmc_request *req;
134 struct mmc_command *cmd;
135
136 unsigned long waiting;
137
138 uint32_t cmdat;
139
140 uint16_t irq_mask;
141
142 spinlock_t lock;
143
144 struct timer_list timeout_timer;
145 struct sg_mapping_iter miter;
146 enum jz4740_mmc_state state;
147
148 /* DMA support */
149 struct dma_chan *dma_rx;
150 struct dma_chan *dma_tx;
151 struct jz4740_mmc_host_next next_data;
152 bool use_dma;
153 int sg_len;
154
155 /* The DMA trigger level is 8 words, that is to say, the DMA read
156 * trigger is when data words in MSC_RXFIFO is >= 8 and the DMA write
157 * trigger is when data words in MSC_TXFIFO is < 8.
158 */
159 #define JZ4740_MMC_FIFO_HALF_SIZE 8
160 };
161
162 /*----------------------------------------------------------------------------*/
163 /* DMA infrastructure */
164
165 static void jz4740_mmc_release_dma_channels(struct jz4740_mmc_host *host)
166 {
167 if (!host->use_dma)
168 return;
169
170 dma_release_channel(host->dma_tx);
171 dma_release_channel(host->dma_rx);
172 }
173
174 static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host)
175 {
176 dma_cap_mask_t mask;
177
178 dma_cap_zero(mask);
179 dma_cap_set(DMA_SLAVE, mask);
180
181 host->dma_tx = dma_request_channel(mask, NULL, host);
182 if (!host->dma_tx) {
183 dev_err(mmc_dev(host->mmc), "Failed to get dma_tx channel\n");
184 return -ENODEV;
185 }
186
187 host->dma_rx = dma_request_channel(mask, NULL, host);
188 if (!host->dma_rx) {
189 dev_err(mmc_dev(host->mmc), "Failed to get dma_rx channel\n");
190 goto free_master_write;
191 }
192
193 /* Initialize DMA pre request cookie */
194 host->next_data.cookie = 1;
195
196 return 0;
197
198 free_master_write:
199 dma_release_channel(host->dma_tx);
200 return -ENODEV;
201 }
202
203 static inline int jz4740_mmc_get_dma_dir(struct mmc_data *data)
204 {
205 return (data->flags & MMC_DATA_READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
206 }
207
208 static inline struct dma_chan *jz4740_mmc_get_dma_chan(struct jz4740_mmc_host *host,
209 struct mmc_data *data)
210 {
211 return (data->flags & MMC_DATA_READ) ? host->dma_rx : host->dma_tx;
212 }
213
214 static void jz4740_mmc_dma_unmap(struct jz4740_mmc_host *host,
215 struct mmc_data *data)
216 {
217 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
218 enum dma_data_direction dir = jz4740_mmc_get_dma_dir(data);
219
220 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
221 }
222
223 /* Prepares DMA data for current/next transfer, returns non-zero on failure */
224 static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
225 struct mmc_data *data,
226 struct jz4740_mmc_host_next *next,
227 struct dma_chan *chan)
228 {
229 struct jz4740_mmc_host_next *next_data = &host->next_data;
230 enum dma_data_direction dir = jz4740_mmc_get_dma_dir(data);
231 int sg_len;
232
233 if (!next && data->host_cookie &&
234 data->host_cookie != host->next_data.cookie) {
235 dev_warn(mmc_dev(host->mmc),
236 "[%s] invalid cookie: data->host_cookie %d host->next_data.cookie %d\n",
237 __func__,
238 data->host_cookie,
239 host->next_data.cookie);
240 data->host_cookie = 0;
241 }
242
243 /* Check if next job is already prepared */
244 if (next || data->host_cookie != host->next_data.cookie) {
245 sg_len = dma_map_sg(chan->device->dev,
246 data->sg,
247 data->sg_len,
248 dir);
249
250 } else {
251 sg_len = next_data->sg_len;
252 next_data->sg_len = 0;
253 }
254
255 if (sg_len <= 0) {
256 dev_err(mmc_dev(host->mmc),
257 "Failed to map scatterlist for DMA operation\n");
258 return -EINVAL;
259 }
260
261 if (next) {
262 next->sg_len = sg_len;
263 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
264 } else
265 host->sg_len = sg_len;
266
267 return 0;
268 }
269
270 static int jz4740_mmc_start_dma_transfer(struct jz4740_mmc_host *host,
271 struct mmc_data *data)
272 {
273 int ret;
274 struct dma_chan *chan;
275 struct dma_async_tx_descriptor *desc;
276 struct dma_slave_config conf = {
277 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
278 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
279 .src_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
280 .dst_maxburst = JZ4740_MMC_FIFO_HALF_SIZE,
281 };
282
283 if (data->flags & MMC_DATA_WRITE) {
284 conf.direction = DMA_MEM_TO_DEV;
285 conf.dst_addr = host->mem_res->start + JZ_REG_MMC_TXFIFO;
286 conf.slave_id = JZ4740_DMA_TYPE_MMC_TRANSMIT;
287 chan = host->dma_tx;
288 } else {
289 conf.direction = DMA_DEV_TO_MEM;
290 conf.src_addr = host->mem_res->start + JZ_REG_MMC_RXFIFO;
291 conf.slave_id = JZ4740_DMA_TYPE_MMC_RECEIVE;
292 chan = host->dma_rx;
293 }
294
295 ret = jz4740_mmc_prepare_dma_data(host, data, NULL, chan);
296 if (ret)
297 return ret;
298
299 dmaengine_slave_config(chan, &conf);
300 desc = dmaengine_prep_slave_sg(chan,
301 data->sg,
302 host->sg_len,
303 conf.direction,
304 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
305 if (!desc) {
306 dev_err(mmc_dev(host->mmc),
307 "Failed to allocate DMA %s descriptor",
308 conf.direction == DMA_MEM_TO_DEV ? "TX" : "RX");
309 goto dma_unmap;
310 }
311
312 dmaengine_submit(desc);
313 dma_async_issue_pending(chan);
314
315 return 0;
316
317 dma_unmap:
318 jz4740_mmc_dma_unmap(host, data);
319 return -ENOMEM;
320 }
321
322 static void jz4740_mmc_pre_request(struct mmc_host *mmc,
323 struct mmc_request *mrq,
324 bool is_first_req)
325 {
326 struct jz4740_mmc_host *host = mmc_priv(mmc);
327 struct mmc_data *data = mrq->data;
328 struct jz4740_mmc_host_next *next_data = &host->next_data;
329
330 BUG_ON(data->host_cookie);
331
332 if (host->use_dma) {
333 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
334
335 if (jz4740_mmc_prepare_dma_data(host, data, next_data, chan))
336 data->host_cookie = 0;
337 }
338 }
339
340 static void jz4740_mmc_post_request(struct mmc_host *mmc,
341 struct mmc_request *mrq,
342 int err)
343 {
344 struct jz4740_mmc_host *host = mmc_priv(mmc);
345 struct mmc_data *data = mrq->data;
346
347 if (host->use_dma && data->host_cookie) {
348 jz4740_mmc_dma_unmap(host, data);
349 data->host_cookie = 0;
350 }
351
352 if (err) {
353 struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
354
355 dmaengine_terminate_all(chan);
356 }
357 }
358
359 /*----------------------------------------------------------------------------*/
360
361 static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
362 unsigned int irq, bool enabled)
363 {
364 unsigned long flags;
365
366 spin_lock_irqsave(&host->lock, flags);
367 if (enabled)
368 host->irq_mask &= ~irq;
369 else
370 host->irq_mask |= irq;
371 spin_unlock_irqrestore(&host->lock, flags);
372
373 writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
374 }
375
376 static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
377 bool start_transfer)
378 {
379 uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
380
381 if (start_transfer)
382 val |= JZ_MMC_STRPCL_START_OP;
383
384 writew(val, host->base + JZ_REG_MMC_STRPCL);
385 }
386
387 static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
388 {
389 uint32_t status;
390 unsigned int timeout = 1000;
391
392 writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
393 do {
394 status = readl(host->base + JZ_REG_MMC_STATUS);
395 } while (status & JZ_MMC_STATUS_CLK_EN && --timeout);
396 }
397
398 static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
399 {
400 uint32_t status;
401 unsigned int timeout = 1000;
402
403 writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
404 udelay(10);
405 do {
406 status = readl(host->base + JZ_REG_MMC_STATUS);
407 } while (status & JZ_MMC_STATUS_IS_RESETTING && --timeout);
408 }
409
410 static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
411 {
412 struct mmc_request *req;
413
414 req = host->req;
415 host->req = NULL;
416
417 mmc_request_done(host->mmc, req);
418 }
419
420 static unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
421 unsigned int irq)
422 {
423 unsigned int timeout = 0x800;
424 uint16_t status;
425
426 do {
427 status = readw(host->base + JZ_REG_MMC_IREG);
428 } while (!(status & irq) && --timeout);
429
430 if (timeout == 0) {
431 set_bit(0, &host->waiting);
432 mod_timer(&host->timeout_timer, jiffies + 5*HZ);
433 jz4740_mmc_set_irq_enabled(host, irq, true);
434 return true;
435 }
436
437 return false;
438 }
439
440 static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
441 struct mmc_data *data)
442 {
443 int status;
444
445 status = readl(host->base + JZ_REG_MMC_STATUS);
446 if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
447 if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
448 host->req->cmd->error = -ETIMEDOUT;
449 data->error = -ETIMEDOUT;
450 } else {
451 host->req->cmd->error = -EIO;
452 data->error = -EIO;
453 }
454 } else if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
455 if (status & (JZ_MMC_STATUS_TIMEOUT_READ)) {
456 host->req->cmd->error = -ETIMEDOUT;
457 data->error = -ETIMEDOUT;
458 } else {
459 host->req->cmd->error = -EIO;
460 data->error = -EIO;
461 }
462 }
463 }
464
465 static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
466 struct mmc_data *data)
467 {
468 struct sg_mapping_iter *miter = &host->miter;
469 void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
470 uint32_t *buf;
471 bool timeout;
472 size_t i, j;
473
474 while (sg_miter_next(miter)) {
475 buf = miter->addr;
476 i = miter->length / 4;
477 j = i / 8;
478 i = i & 0x7;
479 while (j) {
480 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
481 if (unlikely(timeout))
482 goto poll_timeout;
483
484 writel(buf[0], fifo_addr);
485 writel(buf[1], fifo_addr);
486 writel(buf[2], fifo_addr);
487 writel(buf[3], fifo_addr);
488 writel(buf[4], fifo_addr);
489 writel(buf[5], fifo_addr);
490 writel(buf[6], fifo_addr);
491 writel(buf[7], fifo_addr);
492 buf += 8;
493 --j;
494 }
495 if (unlikely(i)) {
496 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
497 if (unlikely(timeout))
498 goto poll_timeout;
499
500 while (i) {
501 writel(*buf, fifo_addr);
502 ++buf;
503 --i;
504 }
505 }
506 data->bytes_xfered += miter->length;
507 }
508 sg_miter_stop(miter);
509
510 return false;
511
512 poll_timeout:
513 miter->consumed = (void *)buf - miter->addr;
514 data->bytes_xfered += miter->consumed;
515 sg_miter_stop(miter);
516
517 return true;
518 }
519
520 static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
521 struct mmc_data *data)
522 {
523 struct sg_mapping_iter *miter = &host->miter;
524 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
525 uint32_t *buf;
526 uint32_t d;
527 uint16_t status;
528 size_t i, j;
529 unsigned int timeout;
530
531 while (sg_miter_next(miter)) {
532 buf = miter->addr;
533 i = miter->length;
534 j = i / 32;
535 i = i & 0x1f;
536 while (j) {
537 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
538 if (unlikely(timeout))
539 goto poll_timeout;
540
541 buf[0] = readl(fifo_addr);
542 buf[1] = readl(fifo_addr);
543 buf[2] = readl(fifo_addr);
544 buf[3] = readl(fifo_addr);
545 buf[4] = readl(fifo_addr);
546 buf[5] = readl(fifo_addr);
547 buf[6] = readl(fifo_addr);
548 buf[7] = readl(fifo_addr);
549
550 buf += 8;
551 --j;
552 }
553
554 if (unlikely(i)) {
555 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
556 if (unlikely(timeout))
557 goto poll_timeout;
558
559 while (i >= 4) {
560 *buf++ = readl(fifo_addr);
561 i -= 4;
562 }
563 if (unlikely(i > 0)) {
564 d = readl(fifo_addr);
565 memcpy(buf, &d, i);
566 }
567 }
568 data->bytes_xfered += miter->length;
569
570 /* This can go away once MIPS implements
571 * flush_kernel_dcache_page */
572 flush_dcache_page(miter->page);
573 }
574 sg_miter_stop(miter);
575
576 /* For whatever reason there is sometime one word more in the fifo then
577 * requested */
578 timeout = 1000;
579 status = readl(host->base + JZ_REG_MMC_STATUS);
580 while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
581 d = readl(fifo_addr);
582 status = readl(host->base + JZ_REG_MMC_STATUS);
583 }
584
585 return false;
586
587 poll_timeout:
588 miter->consumed = (void *)buf - miter->addr;
589 data->bytes_xfered += miter->consumed;
590 sg_miter_stop(miter);
591
592 return true;
593 }
594
595 static void jz4740_mmc_timeout(unsigned long data)
596 {
597 struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
598
599 if (!test_and_clear_bit(0, &host->waiting))
600 return;
601
602 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
603
604 host->req->cmd->error = -ETIMEDOUT;
605 jz4740_mmc_request_done(host);
606 }
607
608 static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
609 struct mmc_command *cmd)
610 {
611 int i;
612 uint16_t tmp;
613 void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
614
615 if (cmd->flags & MMC_RSP_136) {
616 tmp = readw(fifo_addr);
617 for (i = 0; i < 4; ++i) {
618 cmd->resp[i] = tmp << 24;
619 tmp = readw(fifo_addr);
620 cmd->resp[i] |= tmp << 8;
621 tmp = readw(fifo_addr);
622 cmd->resp[i] |= tmp >> 8;
623 }
624 } else {
625 cmd->resp[0] = readw(fifo_addr) << 24;
626 cmd->resp[0] |= readw(fifo_addr) << 8;
627 cmd->resp[0] |= readw(fifo_addr) & 0xff;
628 }
629 }
630
631 static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
632 struct mmc_command *cmd)
633 {
634 uint32_t cmdat = host->cmdat;
635
636 host->cmdat &= ~JZ_MMC_CMDAT_INIT;
637 jz4740_mmc_clock_disable(host);
638
639 host->cmd = cmd;
640
641 if (cmd->flags & MMC_RSP_BUSY)
642 cmdat |= JZ_MMC_CMDAT_BUSY;
643
644 switch (mmc_resp_type(cmd)) {
645 case MMC_RSP_R1B:
646 case MMC_RSP_R1:
647 cmdat |= JZ_MMC_CMDAT_RSP_R1;
648 break;
649 case MMC_RSP_R2:
650 cmdat |= JZ_MMC_CMDAT_RSP_R2;
651 break;
652 case MMC_RSP_R3:
653 cmdat |= JZ_MMC_CMDAT_RSP_R3;
654 break;
655 default:
656 break;
657 }
658
659 if (cmd->data) {
660 cmdat |= JZ_MMC_CMDAT_DATA_EN;
661 if (cmd->data->flags & MMC_DATA_WRITE)
662 cmdat |= JZ_MMC_CMDAT_WRITE;
663 if (cmd->data->flags & MMC_DATA_STREAM)
664 cmdat |= JZ_MMC_CMDAT_STREAM;
665 if (host->use_dma)
666 cmdat |= JZ_MMC_CMDAT_DMA_EN;
667
668 writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
669 writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
670 }
671
672 writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
673 writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
674 writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
675
676 jz4740_mmc_clock_enable(host, 1);
677 }
678
679 static void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
680 {
681 struct mmc_command *cmd = host->req->cmd;
682 struct mmc_data *data = cmd->data;
683 int direction;
684
685 if (data->flags & MMC_DATA_READ)
686 direction = SG_MITER_TO_SG;
687 else
688 direction = SG_MITER_FROM_SG;
689
690 sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
691 }
692
693
694 static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
695 {
696 struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
697 struct mmc_command *cmd = host->req->cmd;
698 struct mmc_request *req = host->req;
699 struct mmc_data *data = cmd->data;
700 bool timeout = false;
701
702 if (cmd->error)
703 host->state = JZ4740_MMC_STATE_DONE;
704
705 switch (host->state) {
706 case JZ4740_MMC_STATE_READ_RESPONSE:
707 if (cmd->flags & MMC_RSP_PRESENT)
708 jz4740_mmc_read_response(host, cmd);
709
710 if (!data)
711 break;
712
713 jz_mmc_prepare_data_transfer(host);
714
715 case JZ4740_MMC_STATE_TRANSFER_DATA:
716 if (host->use_dma) {
717 /* Use DMA if enabled.
718 * Data transfer direction is defined later by
719 * relying on data flags in
720 * jz4740_mmc_prepare_dma_data() and
721 * jz4740_mmc_start_dma_transfer().
722 */
723 timeout = jz4740_mmc_start_dma_transfer(host, data);
724 data->bytes_xfered = data->blocks * data->blksz;
725 } else if (data->flags & MMC_DATA_READ)
726 /* Use PIO if DMA is not enabled.
727 * Data transfer direction was defined before
728 * by relying on data flags in
729 * jz_mmc_prepare_data_transfer().
730 */
731 timeout = jz4740_mmc_read_data(host, data);
732 else
733 timeout = jz4740_mmc_write_data(host, data);
734
735 if (unlikely(timeout)) {
736 host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
737 break;
738 }
739
740 jz4740_mmc_transfer_check_state(host, data);
741
742 timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
743 if (unlikely(timeout)) {
744 host->state = JZ4740_MMC_STATE_SEND_STOP;
745 break;
746 }
747 writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
748
749 case JZ4740_MMC_STATE_SEND_STOP:
750 if (!req->stop)
751 break;
752
753 jz4740_mmc_send_command(host, req->stop);
754
755 if (mmc_resp_type(req->stop) & MMC_RSP_BUSY) {
756 timeout = jz4740_mmc_poll_irq(host,
757 JZ_MMC_IRQ_PRG_DONE);
758 if (timeout) {
759 host->state = JZ4740_MMC_STATE_DONE;
760 break;
761 }
762 }
763 case JZ4740_MMC_STATE_DONE:
764 break;
765 }
766
767 if (!timeout)
768 jz4740_mmc_request_done(host);
769
770 return IRQ_HANDLED;
771 }
772
773 static irqreturn_t jz_mmc_irq(int irq, void *devid)
774 {
775 struct jz4740_mmc_host *host = devid;
776 struct mmc_command *cmd = host->cmd;
777 uint16_t irq_reg, status, tmp;
778
779 irq_reg = readw(host->base + JZ_REG_MMC_IREG);
780
781 tmp = irq_reg;
782 irq_reg &= ~host->irq_mask;
783
784 tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
785 JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
786
787 if (tmp != irq_reg)
788 writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
789
790 if (irq_reg & JZ_MMC_IRQ_SDIO) {
791 writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
792 mmc_signal_sdio_irq(host->mmc);
793 irq_reg &= ~JZ_MMC_IRQ_SDIO;
794 }
795
796 if (host->req && cmd && irq_reg) {
797 if (test_and_clear_bit(0, &host->waiting)) {
798 del_timer(&host->timeout_timer);
799
800 status = readl(host->base + JZ_REG_MMC_STATUS);
801
802 if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
803 cmd->error = -ETIMEDOUT;
804 } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
805 cmd->error = -EIO;
806 } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
807 JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
808 if (cmd->data)
809 cmd->data->error = -EIO;
810 cmd->error = -EIO;
811 }
812
813 jz4740_mmc_set_irq_enabled(host, irq_reg, false);
814 writew(irq_reg, host->base + JZ_REG_MMC_IREG);
815
816 return IRQ_WAKE_THREAD;
817 }
818 }
819
820 return IRQ_HANDLED;
821 }
822
823 static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
824 {
825 int div = 0;
826 int real_rate;
827
828 jz4740_mmc_clock_disable(host);
829 clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
830
831 real_rate = clk_get_rate(host->clk);
832
833 while (real_rate > rate && div < 7) {
834 ++div;
835 real_rate >>= 1;
836 }
837
838 writew(div, host->base + JZ_REG_MMC_CLKRT);
839 return real_rate;
840 }
841
842 static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
843 {
844 struct jz4740_mmc_host *host = mmc_priv(mmc);
845
846 host->req = req;
847
848 writew(0xffff, host->base + JZ_REG_MMC_IREG);
849
850 writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
851 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
852
853 host->state = JZ4740_MMC_STATE_READ_RESPONSE;
854 set_bit(0, &host->waiting);
855 mod_timer(&host->timeout_timer, jiffies + 5*HZ);
856 jz4740_mmc_send_command(host, req->cmd);
857 }
858
859 static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
860 {
861 struct jz4740_mmc_host *host = mmc_priv(mmc);
862 if (ios->clock)
863 jz4740_mmc_set_clock_rate(host, ios->clock);
864
865 switch (ios->power_mode) {
866 case MMC_POWER_UP:
867 jz4740_mmc_reset(host);
868 if (gpio_is_valid(host->pdata->gpio_power))
869 gpio_set_value(host->pdata->gpio_power,
870 !host->pdata->power_active_low);
871 host->cmdat |= JZ_MMC_CMDAT_INIT;
872 clk_prepare_enable(host->clk);
873 break;
874 case MMC_POWER_ON:
875 break;
876 default:
877 if (gpio_is_valid(host->pdata->gpio_power))
878 gpio_set_value(host->pdata->gpio_power,
879 host->pdata->power_active_low);
880 clk_disable_unprepare(host->clk);
881 break;
882 }
883
884 switch (ios->bus_width) {
885 case MMC_BUS_WIDTH_1:
886 host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
887 break;
888 case MMC_BUS_WIDTH_4:
889 host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
890 break;
891 default:
892 break;
893 }
894 }
895
896 static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
897 {
898 struct jz4740_mmc_host *host = mmc_priv(mmc);
899 jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
900 }
901
902 static const struct mmc_host_ops jz4740_mmc_ops = {
903 .request = jz4740_mmc_request,
904 .pre_req = jz4740_mmc_pre_request,
905 .post_req = jz4740_mmc_post_request,
906 .set_ios = jz4740_mmc_set_ios,
907 .get_ro = mmc_gpio_get_ro,
908 .get_cd = mmc_gpio_get_cd,
909 .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
910 };
911
912 static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
913 JZ_GPIO_BULK_PIN(MSC_CMD),
914 JZ_GPIO_BULK_PIN(MSC_CLK),
915 JZ_GPIO_BULK_PIN(MSC_DATA0),
916 JZ_GPIO_BULK_PIN(MSC_DATA1),
917 JZ_GPIO_BULK_PIN(MSC_DATA2),
918 JZ_GPIO_BULK_PIN(MSC_DATA3),
919 };
920
921 static int jz4740_mmc_request_gpio(struct device *dev, int gpio,
922 const char *name, bool output, int value)
923 {
924 int ret;
925
926 if (!gpio_is_valid(gpio))
927 return 0;
928
929 ret = gpio_request(gpio, name);
930 if (ret) {
931 dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
932 return ret;
933 }
934
935 if (output)
936 gpio_direction_output(gpio, value);
937 else
938 gpio_direction_input(gpio);
939
940 return 0;
941 }
942
943 static int jz4740_mmc_request_gpios(struct mmc_host *mmc,
944 struct platform_device *pdev)
945 {
946 struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
947 int ret = 0;
948
949 if (!pdata)
950 return 0;
951
952 if (!pdata->card_detect_active_low)
953 mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
954 if (!pdata->read_only_active_low)
955 mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
956
957 if (gpio_is_valid(pdata->gpio_card_detect)) {
958 ret = mmc_gpio_request_cd(mmc, pdata->gpio_card_detect, 0);
959 if (ret)
960 return ret;
961 }
962
963 if (gpio_is_valid(pdata->gpio_read_only)) {
964 ret = mmc_gpio_request_ro(mmc, pdata->gpio_read_only);
965 if (ret)
966 return ret;
967 }
968
969 return jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
970 "MMC read only", true, pdata->power_active_low);
971 }
972
973 static void jz4740_mmc_free_gpios(struct platform_device *pdev)
974 {
975 struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
976
977 if (!pdata)
978 return;
979
980 if (gpio_is_valid(pdata->gpio_power))
981 gpio_free(pdata->gpio_power);
982 }
983
984 static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
985 {
986 size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
987 if (host->pdata && host->pdata->data_1bit)
988 num_pins -= 3;
989
990 return num_pins;
991 }
992
993 static int jz4740_mmc_probe(struct platform_device* pdev)
994 {
995 int ret;
996 struct mmc_host *mmc;
997 struct jz4740_mmc_host *host;
998 struct jz4740_mmc_platform_data *pdata;
999
1000 pdata = pdev->dev.platform_data;
1001
1002 mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
1003 if (!mmc) {
1004 dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
1005 return -ENOMEM;
1006 }
1007
1008 host = mmc_priv(mmc);
1009 host->pdata = pdata;
1010
1011 host->irq = platform_get_irq(pdev, 0);
1012 if (host->irq < 0) {
1013 ret = host->irq;
1014 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
1015 goto err_free_host;
1016 }
1017
1018 host->clk = devm_clk_get(&pdev->dev, "mmc");
1019 if (IS_ERR(host->clk)) {
1020 ret = PTR_ERR(host->clk);
1021 dev_err(&pdev->dev, "Failed to get mmc clock\n");
1022 goto err_free_host;
1023 }
1024
1025 host->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1026 host->base = devm_ioremap_resource(&pdev->dev, host->mem_res);
1027 if (IS_ERR(host->base)) {
1028 ret = PTR_ERR(host->base);
1029 dev_err(&pdev->dev, "Failed to ioremap base memory\n");
1030 goto err_free_host;
1031 }
1032
1033 ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
1034 if (ret) {
1035 dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
1036 goto err_free_host;
1037 }
1038
1039 ret = jz4740_mmc_request_gpios(mmc, pdev);
1040 if (ret)
1041 goto err_gpio_bulk_free;
1042
1043 mmc->ops = &jz4740_mmc_ops;
1044 mmc->f_min = JZ_MMC_CLK_RATE / 128;
1045 mmc->f_max = JZ_MMC_CLK_RATE;
1046 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1047 mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
1048 mmc->caps |= MMC_CAP_SDIO_IRQ;
1049
1050 mmc->max_blk_size = (1 << 10) - 1;
1051 mmc->max_blk_count = (1 << 15) - 1;
1052 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1053
1054 mmc->max_segs = 128;
1055 mmc->max_seg_size = mmc->max_req_size;
1056
1057 host->mmc = mmc;
1058 host->pdev = pdev;
1059 spin_lock_init(&host->lock);
1060 host->irq_mask = 0xffff;
1061
1062 ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
1063 dev_name(&pdev->dev), host);
1064 if (ret) {
1065 dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
1066 goto err_free_gpios;
1067 }
1068
1069 jz4740_mmc_reset(host);
1070 jz4740_mmc_clock_disable(host);
1071 setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
1072 (unsigned long)host);
1073 /* It is not important when it times out, it just needs to timeout. */
1074 set_timer_slack(&host->timeout_timer, HZ);
1075
1076 host->use_dma = true;
1077 if (host->use_dma && jz4740_mmc_acquire_dma_channels(host) != 0)
1078 host->use_dma = false;
1079
1080 platform_set_drvdata(pdev, host);
1081 ret = mmc_add_host(mmc);
1082
1083 if (ret) {
1084 dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
1085 goto err_free_irq;
1086 }
1087 dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
1088
1089 dev_info(&pdev->dev, "Using %s, %d-bit mode\n",
1090 host->use_dma ? "DMA" : "PIO",
1091 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1092
1093 return 0;
1094
1095 err_free_irq:
1096 free_irq(host->irq, host);
1097 err_free_gpios:
1098 jz4740_mmc_free_gpios(pdev);
1099 err_gpio_bulk_free:
1100 if (host->use_dma)
1101 jz4740_mmc_release_dma_channels(host);
1102 jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
1103 err_free_host:
1104 mmc_free_host(mmc);
1105
1106 return ret;
1107 }
1108
1109 static int jz4740_mmc_remove(struct platform_device *pdev)
1110 {
1111 struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
1112
1113 del_timer_sync(&host->timeout_timer);
1114 jz4740_mmc_set_irq_enabled(host, 0xff, false);
1115 jz4740_mmc_reset(host);
1116
1117 mmc_remove_host(host->mmc);
1118
1119 free_irq(host->irq, host);
1120
1121 jz4740_mmc_free_gpios(pdev);
1122 jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
1123
1124 if (host->use_dma)
1125 jz4740_mmc_release_dma_channels(host);
1126
1127 mmc_free_host(host->mmc);
1128
1129 return 0;
1130 }
1131
1132 #ifdef CONFIG_PM_SLEEP
1133
1134 static int jz4740_mmc_suspend(struct device *dev)
1135 {
1136 struct jz4740_mmc_host *host = dev_get_drvdata(dev);
1137
1138 jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
1139
1140 return 0;
1141 }
1142
1143 static int jz4740_mmc_resume(struct device *dev)
1144 {
1145 struct jz4740_mmc_host *host = dev_get_drvdata(dev);
1146
1147 jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
1148
1149 return 0;
1150 }
1151
1152 static SIMPLE_DEV_PM_OPS(jz4740_mmc_pm_ops, jz4740_mmc_suspend,
1153 jz4740_mmc_resume);
1154 #define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
1155 #else
1156 #define JZ4740_MMC_PM_OPS NULL
1157 #endif
1158
1159 static struct platform_driver jz4740_mmc_driver = {
1160 .probe = jz4740_mmc_probe,
1161 .remove = jz4740_mmc_remove,
1162 .driver = {
1163 .name = "jz4740-mmc",
1164 .pm = JZ4740_MMC_PM_OPS,
1165 },
1166 };
1167
1168 module_platform_driver(jz4740_mmc_driver);
1169
1170 MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
1171 MODULE_LICENSE("GPL");
1172 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
Linux kernel - Deliverables
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