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Merge branch 'move-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/davej...
[linux-2.6/next.git] / drivers / mmc / host / sh_mmcif.c
blobaf97015a2fc7f57b216992a2032869f40cbf5e59
1 /*
2 * MMCIF eMMC driver.
3 *
4 * Copyright (C) 2010 Renesas Solutions Corp.
5 * Yusuke Goda <yusuke.goda.sx@renesas.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License.
10 *
11 *
12 * TODO
13 * 1. DMA
14 * 2. Power management
15 * 3. Handle MMC errors better
16 *
17 */
18
19 #include <linux/clk.h>
20 #include <linux/completion.h>
21 #include <linux/delay.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/dmaengine.h>
24 #include <linux/mmc/card.h>
25 #include <linux/mmc/core.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/mmc.h>
28 #include <linux/mmc/sdio.h>
29 #include <linux/mmc/sh_mmcif.h>
30 #include <linux/pagemap.h>
31 #include <linux/platform_device.h>
32
33 #define DRIVER_NAME "sh_mmcif"
34 #define DRIVER_VERSION "2010-04-28"
35
36 /* CE_CMD_SET */
37 #define CMD_MASK 0x3f000000
38 #define CMD_SET_RTYP_NO ((0 << 23) | (0 << 22))
39 #define CMD_SET_RTYP_6B ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */
40 #define CMD_SET_RTYP_17B ((1 << 23) | (0 << 22)) /* R2 */
41 #define CMD_SET_RBSY (1 << 21) /* R1b */
42 #define CMD_SET_CCSEN (1 << 20)
43 #define CMD_SET_WDAT (1 << 19) /* 1: on data, 0: no data */
44 #define CMD_SET_DWEN (1 << 18) /* 1: write, 0: read */
45 #define CMD_SET_CMLTE (1 << 17) /* 1: multi block trans, 0: single */
46 #define CMD_SET_CMD12EN (1 << 16) /* 1: CMD12 auto issue */
47 #define CMD_SET_RIDXC_INDEX ((0 << 15) | (0 << 14)) /* index check */
48 #define CMD_SET_RIDXC_BITS ((0 << 15) | (1 << 14)) /* check bits check */
49 #define CMD_SET_RIDXC_NO ((1 << 15) | (0 << 14)) /* no check */
50 #define CMD_SET_CRC7C ((0 << 13) | (0 << 12)) /* CRC7 check*/
51 #define CMD_SET_CRC7C_BITS ((0 << 13) | (1 << 12)) /* check bits check*/
52 #define CMD_SET_CRC7C_INTERNAL ((1 << 13) | (0 << 12)) /* internal CRC7 check*/
53 #define CMD_SET_CRC16C (1 << 10) /* 0: CRC16 check*/
54 #define CMD_SET_CRCSTE (1 << 8) /* 1: not receive CRC status */
55 #define CMD_SET_TBIT (1 << 7) /* 1: tran mission bit "Low" */
56 #define CMD_SET_OPDM (1 << 6) /* 1: open/drain */
57 #define CMD_SET_CCSH (1 << 5)
58 #define CMD_SET_DATW_1 ((0 << 1) | (0 << 0)) /* 1bit */
59 #define CMD_SET_DATW_4 ((0 << 1) | (1 << 0)) /* 4bit */
60 #define CMD_SET_DATW_8 ((1 << 1) | (0 << 0)) /* 8bit */
61
62 /* CE_CMD_CTRL */
63 #define CMD_CTRL_BREAK (1 << 0)
64
65 /* CE_BLOCK_SET */
66 #define BLOCK_SIZE_MASK 0x0000ffff
67
68 /* CE_INT */
69 #define INT_CCSDE (1 << 29)
70 #define INT_CMD12DRE (1 << 26)
71 #define INT_CMD12RBE (1 << 25)
72 #define INT_CMD12CRE (1 << 24)
73 #define INT_DTRANE (1 << 23)
74 #define INT_BUFRE (1 << 22)
75 #define INT_BUFWEN (1 << 21)
76 #define INT_BUFREN (1 << 20)
77 #define INT_CCSRCV (1 << 19)
78 #define INT_RBSYE (1 << 17)
79 #define INT_CRSPE (1 << 16)
80 #define INT_CMDVIO (1 << 15)
81 #define INT_BUFVIO (1 << 14)
82 #define INT_WDATERR (1 << 11)
83 #define INT_RDATERR (1 << 10)
84 #define INT_RIDXERR (1 << 9)
85 #define INT_RSPERR (1 << 8)
86 #define INT_CCSTO (1 << 5)
87 #define INT_CRCSTO (1 << 4)
88 #define INT_WDATTO (1 << 3)
89 #define INT_RDATTO (1 << 2)
90 #define INT_RBSYTO (1 << 1)
91 #define INT_RSPTO (1 << 0)
92 #define INT_ERR_STS (INT_CMDVIO | INT_BUFVIO | INT_WDATERR | \
93 INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
94 INT_CCSTO | INT_CRCSTO | INT_WDATTO | \
95 INT_RDATTO | INT_RBSYTO | INT_RSPTO)
96
97 /* CE_INT_MASK */
98 #define MASK_ALL 0x00000000
99 #define MASK_MCCSDE (1 << 29)
100 #define MASK_MCMD12DRE (1 << 26)
101 #define MASK_MCMD12RBE (1 << 25)
102 #define MASK_MCMD12CRE (1 << 24)
103 #define MASK_MDTRANE (1 << 23)
104 #define MASK_MBUFRE (1 << 22)
105 #define MASK_MBUFWEN (1 << 21)
106 #define MASK_MBUFREN (1 << 20)
107 #define MASK_MCCSRCV (1 << 19)
108 #define MASK_MRBSYE (1 << 17)
109 #define MASK_MCRSPE (1 << 16)
110 #define MASK_MCMDVIO (1 << 15)
111 #define MASK_MBUFVIO (1 << 14)
112 #define MASK_MWDATERR (1 << 11)
113 #define MASK_MRDATERR (1 << 10)
114 #define MASK_MRIDXERR (1 << 9)
115 #define MASK_MRSPERR (1 << 8)
116 #define MASK_MCCSTO (1 << 5)
117 #define MASK_MCRCSTO (1 << 4)
118 #define MASK_MWDATTO (1 << 3)
119 #define MASK_MRDATTO (1 << 2)
120 #define MASK_MRBSYTO (1 << 1)
121 #define MASK_MRSPTO (1 << 0)
122
123 /* CE_HOST_STS1 */
124 #define STS1_CMDSEQ (1 << 31)
125
126 /* CE_HOST_STS2 */
127 #define STS2_CRCSTE (1 << 31)
128 #define STS2_CRC16E (1 << 30)
129 #define STS2_AC12CRCE (1 << 29)
130 #define STS2_RSPCRC7E (1 << 28)
131 #define STS2_CRCSTEBE (1 << 27)
132 #define STS2_RDATEBE (1 << 26)
133 #define STS2_AC12REBE (1 << 25)
134 #define STS2_RSPEBE (1 << 24)
135 #define STS2_AC12IDXE (1 << 23)
136 #define STS2_RSPIDXE (1 << 22)
137 #define STS2_CCSTO (1 << 15)
138 #define STS2_RDATTO (1 << 14)
139 #define STS2_DATBSYTO (1 << 13)
140 #define STS2_CRCSTTO (1 << 12)
141 #define STS2_AC12BSYTO (1 << 11)
142 #define STS2_RSPBSYTO (1 << 10)
143 #define STS2_AC12RSPTO (1 << 9)
144 #define STS2_RSPTO (1 << 8)
145 #define STS2_CRC_ERR (STS2_CRCSTE | STS2_CRC16E | \
146 STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
147 #define STS2_TIMEOUT_ERR (STS2_CCSTO | STS2_RDATTO | \
148 STS2_DATBSYTO | STS2_CRCSTTO | \
149 STS2_AC12BSYTO | STS2_RSPBSYTO | \
150 STS2_AC12RSPTO | STS2_RSPTO)
151
152 #define CLKDEV_EMMC_DATA 52000000 /* 52MHz */
153 #define CLKDEV_MMC_DATA 20000000 /* 20MHz */
154 #define CLKDEV_INIT 400000 /* 400 KHz */
155
156 struct sh_mmcif_host {
157 struct mmc_host *mmc;
158 struct mmc_data *data;
159 struct platform_device *pd;
160 struct clk *hclk;
161 unsigned int clk;
162 int bus_width;
163 bool sd_error;
164 long timeout;
165 void __iomem *addr;
166 struct completion intr_wait;
167
168 /* DMA support */
169 struct dma_chan *chan_rx;
170 struct dma_chan *chan_tx;
171 struct completion dma_complete;
172 bool dma_active;
173 };
174
175 static inline void sh_mmcif_bitset(struct sh_mmcif_host *host,
176 unsigned int reg, u32 val)
177 {
178 writel(val | readl(host->addr + reg), host->addr + reg);
179 }
180
181 static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host,
182 unsigned int reg, u32 val)
183 {
184 writel(~val & readl(host->addr + reg), host->addr + reg);
185 }
186
187 static void mmcif_dma_complete(void *arg)
188 {
189 struct sh_mmcif_host *host = arg;
190 dev_dbg(&host->pd->dev, "Command completed\n");
191
192 if (WARN(!host->data, "%s: NULL data in DMA completion!\n",
193 dev_name(&host->pd->dev)))
194 return;
195
196 if (host->data->flags & MMC_DATA_READ)
197 dma_unmap_sg(host->chan_rx->device->dev,
198 host->data->sg, host->data->sg_len,
199 DMA_FROM_DEVICE);
200 else
201 dma_unmap_sg(host->chan_tx->device->dev,
202 host->data->sg, host->data->sg_len,
203 DMA_TO_DEVICE);
204
205 complete(&host->dma_complete);
206 }
207
208 static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
209 {
210 struct scatterlist *sg = host->data->sg;
211 struct dma_async_tx_descriptor *desc = NULL;
212 struct dma_chan *chan = host->chan_rx;
213 dma_cookie_t cookie = -EINVAL;
214 int ret;
215
216 ret = dma_map_sg(chan->device->dev, sg, host->data->sg_len,
217 DMA_FROM_DEVICE);
218 if (ret > 0) {
219 host->dma_active = true;
220 desc = chan->device->device_prep_slave_sg(chan, sg, ret,
221 DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
222 }
223
224 if (desc) {
225 desc->callback = mmcif_dma_complete;
226 desc->callback_param = host;
227 cookie = dmaengine_submit(desc);
228 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN);
229 dma_async_issue_pending(chan);
230 }
231 dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
232 __func__, host->data->sg_len, ret, cookie);
233
234 if (!desc) {
235 /* DMA failed, fall back to PIO */
236 if (ret >= 0)
237 ret = -EIO;
238 host->chan_rx = NULL;
239 host->dma_active = false;
240 dma_release_channel(chan);
241 /* Free the Tx channel too */
242 chan = host->chan_tx;
243 if (chan) {
244 host->chan_tx = NULL;
245 dma_release_channel(chan);
246 }
247 dev_warn(&host->pd->dev,
248 "DMA failed: %d, falling back to PIO\n", ret);
249 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
250 }
251
252 dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
253 desc, cookie, host->data->sg_len);
254 }
255
256 static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
257 {
258 struct scatterlist *sg = host->data->sg;
259 struct dma_async_tx_descriptor *desc = NULL;
260 struct dma_chan *chan = host->chan_tx;
261 dma_cookie_t cookie = -EINVAL;
262 int ret;
263
264 ret = dma_map_sg(chan->device->dev, sg, host->data->sg_len,
265 DMA_TO_DEVICE);
266 if (ret > 0) {
267 host->dma_active = true;
268 desc = chan->device->device_prep_slave_sg(chan, sg, ret,
269 DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
270 }
271
272 if (desc) {
273 desc->callback = mmcif_dma_complete;
274 desc->callback_param = host;
275 cookie = dmaengine_submit(desc);
276 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN);
277 dma_async_issue_pending(chan);
278 }
279 dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
280 __func__, host->data->sg_len, ret, cookie);
281
282 if (!desc) {
283 /* DMA failed, fall back to PIO */
284 if (ret >= 0)
285 ret = -EIO;
286 host->chan_tx = NULL;
287 host->dma_active = false;
288 dma_release_channel(chan);
289 /* Free the Rx channel too */
290 chan = host->chan_rx;
291 if (chan) {
292 host->chan_rx = NULL;
293 dma_release_channel(chan);
294 }
295 dev_warn(&host->pd->dev,
296 "DMA failed: %d, falling back to PIO\n", ret);
297 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
298 }
299
300 dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d\n", __func__,
301 desc, cookie);
302 }
303
304 static bool sh_mmcif_filter(struct dma_chan *chan, void *arg)
305 {
306 dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
307 chan->private = arg;
308 return true;
309 }
310
311 static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
312 struct sh_mmcif_plat_data *pdata)
313 {
314 host->dma_active = false;
315
316 /* We can only either use DMA for both Tx and Rx or not use it at all */
317 if (pdata->dma) {
318 dma_cap_mask_t mask;
319
320 dma_cap_zero(mask);
321 dma_cap_set(DMA_SLAVE, mask);
322
323 host->chan_tx = dma_request_channel(mask, sh_mmcif_filter,
324 &pdata->dma->chan_priv_tx);
325 dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
326 host->chan_tx);
327
328 if (!host->chan_tx)
329 return;
330
331 host->chan_rx = dma_request_channel(mask, sh_mmcif_filter,
332 &pdata->dma->chan_priv_rx);
333 dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
334 host->chan_rx);
335
336 if (!host->chan_rx) {
337 dma_release_channel(host->chan_tx);
338 host->chan_tx = NULL;
339 return;
340 }
341
342 init_completion(&host->dma_complete);
343 }
344 }
345
346 static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
347 {
348 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
349 /* Descriptors are freed automatically */
350 if (host->chan_tx) {
351 struct dma_chan *chan = host->chan_tx;
352 host->chan_tx = NULL;
353 dma_release_channel(chan);
354 }
355 if (host->chan_rx) {
356 struct dma_chan *chan = host->chan_rx;
357 host->chan_rx = NULL;
358 dma_release_channel(chan);
359 }
360
361 host->dma_active = false;
362 }
363
364 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
365 {
366 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
367
368 sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
369 sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
370
371 if (!clk)
372 return;
373 if (p->sup_pclk && clk == host->clk)
374 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
375 else
376 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
377 (ilog2(__rounddown_pow_of_two(host->clk / clk)) << 16));
378
379 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
380 }
381
382 static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
383 {
384 u32 tmp;
385
386 tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL);
387
388 sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON);
389 sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
390 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
391 SRSPTO_256 | SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
392 /* byte swap on */
393 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
394 }
395
396 static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
397 {
398 u32 state1, state2;
399 int ret, timeout = 10000000;
400
401 host->sd_error = false;
402
403 state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1);
404 state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2);
405 dev_dbg(&host->pd->dev, "ERR HOST_STS1 = %08x\n", state1);
406 dev_dbg(&host->pd->dev, "ERR HOST_STS2 = %08x\n", state2);
407
408 if (state1 & STS1_CMDSEQ) {
409 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK);
410 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK);
411 while (1) {
412 timeout--;
413 if (timeout < 0) {
414 dev_err(&host->pd->dev,
415 "Forceed end of command sequence timeout err\n");
416 return -EIO;
417 }
418 if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1)
419 & STS1_CMDSEQ))
420 break;
421 mdelay(1);
422 }
423 sh_mmcif_sync_reset(host);
424 dev_dbg(&host->pd->dev, "Forced end of command sequence\n");
425 return -EIO;
426 }
427
428 if (state2 & STS2_CRC_ERR) {
429 dev_dbg(&host->pd->dev, ": Happened CRC error\n");
430 ret = -EIO;
431 } else if (state2 & STS2_TIMEOUT_ERR) {
432 dev_dbg(&host->pd->dev, ": Happened Timeout error\n");
433 ret = -ETIMEDOUT;
434 } else {
435 dev_dbg(&host->pd->dev, ": Happened End/Index error\n");
436 ret = -EIO;
437 }
438 return ret;
439 }
440
441 static int sh_mmcif_single_read(struct sh_mmcif_host *host,
442 struct mmc_request *mrq)
443 {
444 struct mmc_data *data = mrq->data;
445 long time;
446 u32 blocksize, i, *p = sg_virt(data->sg);
447
448 /* buf read enable */
449 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
450 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
451 host->timeout);
452 if (time <= 0 || host->sd_error)
453 return sh_mmcif_error_manage(host);
454
455 blocksize = (BLOCK_SIZE_MASK &
456 sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET)) + 3;
457 for (i = 0; i < blocksize / 4; i++)
458 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
459
460 /* buffer read end */
461 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
462 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
463 host->timeout);
464 if (time <= 0 || host->sd_error)
465 return sh_mmcif_error_manage(host);
466
467 return 0;
468 }
469
470 static int sh_mmcif_multi_read(struct sh_mmcif_host *host,
471 struct mmc_request *mrq)
472 {
473 struct mmc_data *data = mrq->data;
474 long time;
475 u32 blocksize, i, j, sec, *p;
476
477 blocksize = BLOCK_SIZE_MASK & sh_mmcif_readl(host->addr,
478 MMCIF_CE_BLOCK_SET);
479 for (j = 0; j < data->sg_len; j++) {
480 p = sg_virt(data->sg);
481 for (sec = 0; sec < data->sg->length / blocksize; sec++) {
482 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
483 /* buf read enable */
484 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
485 host->timeout);
486
487 if (time <= 0 || host->sd_error)
488 return sh_mmcif_error_manage(host);
489
490 for (i = 0; i < blocksize / 4; i++)
491 *p++ = sh_mmcif_readl(host->addr,
492 MMCIF_CE_DATA);
493 }
494 if (j < data->sg_len - 1)
495 data->sg++;
496 }
497 return 0;
498 }
499
500 static int sh_mmcif_single_write(struct sh_mmcif_host *host,
501 struct mmc_request *mrq)
502 {
503 struct mmc_data *data = mrq->data;
504 long time;
505 u32 blocksize, i, *p = sg_virt(data->sg);
506
507 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
508
509 /* buf write enable */
510 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
511 host->timeout);
512 if (time <= 0 || host->sd_error)
513 return sh_mmcif_error_manage(host);
514
515 blocksize = (BLOCK_SIZE_MASK &
516 sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET)) + 3;
517 for (i = 0; i < blocksize / 4; i++)
518 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
519
520 /* buffer write end */
521 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
522
523 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
524 host->timeout);
525 if (time <= 0 || host->sd_error)
526 return sh_mmcif_error_manage(host);
527
528 return 0;
529 }
530
531 static int sh_mmcif_multi_write(struct sh_mmcif_host *host,
532 struct mmc_request *mrq)
533 {
534 struct mmc_data *data = mrq->data;
535 long time;
536 u32 i, sec, j, blocksize, *p;
537
538 blocksize = BLOCK_SIZE_MASK & sh_mmcif_readl(host->addr,
539 MMCIF_CE_BLOCK_SET);
540
541 for (j = 0; j < data->sg_len; j++) {
542 p = sg_virt(data->sg);
543 for (sec = 0; sec < data->sg->length / blocksize; sec++) {
544 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
545 /* buf write enable*/
546 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
547 host->timeout);
548
549 if (time <= 0 || host->sd_error)
550 return sh_mmcif_error_manage(host);
551
552 for (i = 0; i < blocksize / 4; i++)
553 sh_mmcif_writel(host->addr,
554 MMCIF_CE_DATA, *p++);
555 }
556 if (j < data->sg_len - 1)
557 data->sg++;
558 }
559 return 0;
560 }
561
562 static void sh_mmcif_get_response(struct sh_mmcif_host *host,
563 struct mmc_command *cmd)
564 {
565 if (cmd->flags & MMC_RSP_136) {
566 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3);
567 cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2);
568 cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1);
569 cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
570 } else
571 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
572 }
573
574 static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
575 struct mmc_command *cmd)
576 {
577 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12);
578 }
579
580 static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
581 struct mmc_request *mrq, struct mmc_command *cmd, u32 opc)
582 {
583 u32 tmp = 0;
584
585 /* Response Type check */
586 switch (mmc_resp_type(cmd)) {
587 case MMC_RSP_NONE:
588 tmp |= CMD_SET_RTYP_NO;
589 break;
590 case MMC_RSP_R1:
591 case MMC_RSP_R1B:
592 case MMC_RSP_R3:
593 tmp |= CMD_SET_RTYP_6B;
594 break;
595 case MMC_RSP_R2:
596 tmp |= CMD_SET_RTYP_17B;
597 break;
598 default:
599 dev_err(&host->pd->dev, "Unsupported response type.\n");
600 break;
601 }
602 switch (opc) {
603 /* RBSY */
604 case MMC_SWITCH:
605 case MMC_STOP_TRANSMISSION:
606 case MMC_SET_WRITE_PROT:
607 case MMC_CLR_WRITE_PROT:
608 case MMC_ERASE:
609 case MMC_GEN_CMD:
610 tmp |= CMD_SET_RBSY;
611 break;
612 }
613 /* WDAT / DATW */
614 if (host->data) {
615 tmp |= CMD_SET_WDAT;
616 switch (host->bus_width) {
617 case MMC_BUS_WIDTH_1:
618 tmp |= CMD_SET_DATW_1;
619 break;
620 case MMC_BUS_WIDTH_4:
621 tmp |= CMD_SET_DATW_4;
622 break;
623 case MMC_BUS_WIDTH_8:
624 tmp |= CMD_SET_DATW_8;
625 break;
626 default:
627 dev_err(&host->pd->dev, "Unsupported bus width.\n");
628 break;
629 }
630 }
631 /* DWEN */
632 if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK)
633 tmp |= CMD_SET_DWEN;
634 /* CMLTE/CMD12EN */
635 if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) {
636 tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
637 sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET,
638 mrq->data->blocks << 16);
639 }
640 /* RIDXC[1:0] check bits */
641 if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID ||
642 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
643 tmp |= CMD_SET_RIDXC_BITS;
644 /* RCRC7C[1:0] check bits */
645 if (opc == MMC_SEND_OP_COND)
646 tmp |= CMD_SET_CRC7C_BITS;
647 /* RCRC7C[1:0] internal CRC7 */
648 if (opc == MMC_ALL_SEND_CID ||
649 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
650 tmp |= CMD_SET_CRC7C_INTERNAL;
651
652 return opc = ((opc << 24) | tmp);
653 }
654
655 static int sh_mmcif_data_trans(struct sh_mmcif_host *host,
656 struct mmc_request *mrq, u32 opc)
657 {
658 int ret;
659
660 switch (opc) {
661 case MMC_READ_MULTIPLE_BLOCK:
662 ret = sh_mmcif_multi_read(host, mrq);
663 break;
664 case MMC_WRITE_MULTIPLE_BLOCK:
665 ret = sh_mmcif_multi_write(host, mrq);
666 break;
667 case MMC_WRITE_BLOCK:
668 ret = sh_mmcif_single_write(host, mrq);
669 break;
670 case MMC_READ_SINGLE_BLOCK:
671 case MMC_SEND_EXT_CSD:
672 ret = sh_mmcif_single_read(host, mrq);
673 break;
674 default:
675 dev_err(&host->pd->dev, "UNSUPPORTED CMD = d'%08d\n", opc);
676 ret = -EINVAL;
677 break;
678 }
679 return ret;
680 }
681
682 static void sh_mmcif_start_cmd(struct sh_mmcif_host *host,
683 struct mmc_request *mrq, struct mmc_command *cmd)
684 {
685 long time;
686 int ret = 0, mask = 0;
687 u32 opc = cmd->opcode;
688
689 switch (opc) {
690 /* respons busy check */
691 case MMC_SWITCH:
692 case MMC_STOP_TRANSMISSION:
693 case MMC_SET_WRITE_PROT:
694 case MMC_CLR_WRITE_PROT:
695 case MMC_ERASE:
696 case MMC_GEN_CMD:
697 mask = MASK_MRBSYE;
698 break;
699 default:
700 mask = MASK_MCRSPE;
701 break;
702 }
703 mask |= MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR |
704 MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR |
705 MASK_MCCSTO | MASK_MCRCSTO | MASK_MWDATTO |
706 MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO;
707
708 if (host->data) {
709 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0);
710 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET,
711 mrq->data->blksz);
712 }
713 opc = sh_mmcif_set_cmd(host, mrq, cmd, opc);
714
715 sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0);
716 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask);
717 /* set arg */
718 sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
719 /* set cmd */
720 sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
721
722 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
723 host->timeout);
724 if (time <= 0) {
725 cmd->error = sh_mmcif_error_manage(host);
726 return;
727 }
728 if (host->sd_error) {
729 switch (cmd->opcode) {
730 case MMC_ALL_SEND_CID:
731 case MMC_SELECT_CARD:
732 case MMC_APP_CMD:
733 cmd->error = -ETIMEDOUT;
734 break;
735 default:
736 dev_dbg(&host->pd->dev, "Cmd(d'%d) err\n",
737 cmd->opcode);
738 cmd->error = sh_mmcif_error_manage(host);
739 break;
740 }
741 host->sd_error = false;
742 return;
743 }
744 if (!(cmd->flags & MMC_RSP_PRESENT)) {
745 cmd->error = 0;
746 return;
747 }
748 sh_mmcif_get_response(host, cmd);
749 if (host->data) {
750 if (!host->dma_active) {
751 ret = sh_mmcif_data_trans(host, mrq, cmd->opcode);
752 } else {
753 long time =
754 wait_for_completion_interruptible_timeout(&host->dma_complete,
755 host->timeout);
756 if (!time)
757 ret = -ETIMEDOUT;
758 else if (time < 0)
759 ret = time;
760 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC,
761 BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
762 host->dma_active = false;
763 }
764 if (ret < 0)
765 mrq->data->bytes_xfered = 0;
766 else
767 mrq->data->bytes_xfered =
768 mrq->data->blocks * mrq->data->blksz;
769 }
770 cmd->error = ret;
771 }
772
773 static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
774 struct mmc_request *mrq, struct mmc_command *cmd)
775 {
776 long time;
777
778 if (mrq->cmd->opcode == MMC_READ_MULTIPLE_BLOCK)
779 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
780 else if (mrq->cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK)
781 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
782 else {
783 dev_err(&host->pd->dev, "unsupported stop cmd\n");
784 cmd->error = sh_mmcif_error_manage(host);
785 return;
786 }
787
788 time = wait_for_completion_interruptible_timeout(&host->intr_wait,
789 host->timeout);
790 if (time <= 0 || host->sd_error) {
791 cmd->error = sh_mmcif_error_manage(host);
792 return;
793 }
794 sh_mmcif_get_cmd12response(host, cmd);
795 cmd->error = 0;
796 }
797
798 static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq)
799 {
800 struct sh_mmcif_host *host = mmc_priv(mmc);
801
802 switch (mrq->cmd->opcode) {
803 /* MMCIF does not support SD/SDIO command */
804 case SD_IO_SEND_OP_COND:
805 case MMC_APP_CMD:
806 mrq->cmd->error = -ETIMEDOUT;
807 mmc_request_done(mmc, mrq);
808 return;
809 case MMC_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
810 if (!mrq->data) {
811 /* send_if_cond cmd (not support) */
812 mrq->cmd->error = -ETIMEDOUT;
813 mmc_request_done(mmc, mrq);
814 return;
815 }
816 break;
817 default:
818 break;
819 }
820 host->data = mrq->data;
821 if (mrq->data) {
822 if (mrq->data->flags & MMC_DATA_READ) {
823 if (host->chan_rx)
824 sh_mmcif_start_dma_rx(host);
825 } else {
826 if (host->chan_tx)
827 sh_mmcif_start_dma_tx(host);
828 }
829 }
830 sh_mmcif_start_cmd(host, mrq, mrq->cmd);
831 host->data = NULL;
832
833 if (mrq->cmd->error != 0) {
834 mmc_request_done(mmc, mrq);
835 return;
836 }
837 if (mrq->stop)
838 sh_mmcif_stop_cmd(host, mrq, mrq->stop);
839 mmc_request_done(mmc, mrq);
840 }
841
842 static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
843 {
844 struct sh_mmcif_host *host = mmc_priv(mmc);
845 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
846
847 if (ios->power_mode == MMC_POWER_UP) {
848 if (p->set_pwr)
849 p->set_pwr(host->pd, ios->power_mode);
850 } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
851 /* clock stop */
852 sh_mmcif_clock_control(host, 0);
853 if (ios->power_mode == MMC_POWER_OFF && p->down_pwr)
854 p->down_pwr(host->pd);
855 return;
856 }
857
858 if (ios->clock)
859 sh_mmcif_clock_control(host, ios->clock);
860
861 host->bus_width = ios->bus_width;
862 }
863
864 static int sh_mmcif_get_cd(struct mmc_host *mmc)
865 {
866 struct sh_mmcif_host *host = mmc_priv(mmc);
867 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
868
869 if (!p->get_cd)
870 return -ENOSYS;
871 else
872 return p->get_cd(host->pd);
873 }
874
875 static struct mmc_host_ops sh_mmcif_ops = {
876 .request = sh_mmcif_request,
877 .set_ios = sh_mmcif_set_ios,
878 .get_cd = sh_mmcif_get_cd,
879 };
880
881 static void sh_mmcif_detect(struct mmc_host *mmc)
882 {
883 mmc_detect_change(mmc, 0);
884 }
885
886 static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
887 {
888 struct sh_mmcif_host *host = dev_id;
889 u32 state;
890 int err = 0;
891
892 state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
893
894 if (state & INT_RBSYE) {
895 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
896 ~(INT_RBSYE | INT_CRSPE));
897 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MRBSYE);
898 } else if (state & INT_CRSPE) {
899 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_CRSPE);
900 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCRSPE);
901 } else if (state & INT_BUFREN) {
902 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFREN);
903 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
904 } else if (state & INT_BUFWEN) {
905 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFWEN);
906 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
907 } else if (state & INT_CMD12DRE) {
908 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
909 ~(INT_CMD12DRE | INT_CMD12RBE |
910 INT_CMD12CRE | INT_BUFRE));
911 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
912 } else if (state & INT_BUFRE) {
913 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFRE);
914 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
915 } else if (state & INT_DTRANE) {
916 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_DTRANE);
917 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
918 } else if (state & INT_CMD12RBE) {
919 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
920 ~(INT_CMD12RBE | INT_CMD12CRE));
921 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
922 } else if (state & INT_ERR_STS) {
923 /* err interrupts */
924 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
925 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
926 err = 1;
927 } else {
928 dev_dbg(&host->pd->dev, "Not support int\n");
929 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
930 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
931 err = 1;
932 }
933 if (err) {
934 host->sd_error = true;
935 dev_dbg(&host->pd->dev, "int err state = %08x\n", state);
936 }
937 if (state & ~(INT_CMD12RBE | INT_CMD12CRE))
938 complete(&host->intr_wait);
939 else
940 dev_dbg(&host->pd->dev, "Unexpected IRQ 0x%x\n", state);
941
942 return IRQ_HANDLED;
943 }
944
945 static int __devinit sh_mmcif_probe(struct platform_device *pdev)
946 {
947 int ret = 0, irq[2];
948 struct mmc_host *mmc;
949 struct sh_mmcif_host *host;
950 struct sh_mmcif_plat_data *pd;
951 struct resource *res;
952 void __iomem *reg;
953 char clk_name[8];
954
955 irq[0] = platform_get_irq(pdev, 0);
956 irq[1] = platform_get_irq(pdev, 1);
957 if (irq[0] < 0 || irq[1] < 0) {
958 dev_err(&pdev->dev, "Get irq error\n");
959 return -ENXIO;
960 }
961 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
962 if (!res) {
963 dev_err(&pdev->dev, "platform_get_resource error.\n");
964 return -ENXIO;
965 }
966 reg = ioremap(res->start, resource_size(res));
967 if (!reg) {
968 dev_err(&pdev->dev, "ioremap error.\n");
969 return -ENOMEM;
970 }
971 pd = pdev->dev.platform_data;
972 if (!pd) {
973 dev_err(&pdev->dev, "sh_mmcif plat data error.\n");
974 ret = -ENXIO;
975 goto clean_up;
976 }
977 mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), &pdev->dev);
978 if (!mmc) {
979 ret = -ENOMEM;
980 goto clean_up;
981 }
982 host = mmc_priv(mmc);
983 host->mmc = mmc;
984 host->addr = reg;
985 host->timeout = 1000;
986
987 snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);
988 host->hclk = clk_get(&pdev->dev, clk_name);
989 if (IS_ERR(host->hclk)) {
990 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
991 ret = PTR_ERR(host->hclk);
992 goto clean_up1;
993 }
994 clk_enable(host->hclk);
995 host->clk = clk_get_rate(host->hclk);
996 host->pd = pdev;
997
998 init_completion(&host->intr_wait);
999
1000 mmc->ops = &sh_mmcif_ops;
1001 mmc->f_max = host->clk;
1002 /* close to 400KHz */
1003 if (mmc->f_max < 51200000)
1004 mmc->f_min = mmc->f_max / 128;
1005 else if (mmc->f_max < 102400000)
1006 mmc->f_min = mmc->f_max / 256;
1007 else
1008 mmc->f_min = mmc->f_max / 512;
1009 if (pd->ocr)
1010 mmc->ocr_avail = pd->ocr;
1011 mmc->caps = MMC_CAP_MMC_HIGHSPEED;
1012 if (pd->caps)
1013 mmc->caps |= pd->caps;
1014 mmc->max_segs = 32;
1015 mmc->max_blk_size = 512;
1016 mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs;
1017 mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
1018 mmc->max_seg_size = mmc->max_req_size;
1019
1020 sh_mmcif_sync_reset(host);
1021 platform_set_drvdata(pdev, host);
1022
1023 /* See if we also get DMA */
1024 sh_mmcif_request_dma(host, pd);
1025
1026 mmc_add_host(mmc);
1027
1028 ret = request_irq(irq[0], sh_mmcif_intr, 0, "sh_mmc:error", host);
1029 if (ret) {
1030 dev_err(&pdev->dev, "request_irq error (sh_mmc:error)\n");
1031 goto clean_up2;
1032 }
1033 ret = request_irq(irq[1], sh_mmcif_intr, 0, "sh_mmc:int", host);
1034 if (ret) {
1035 free_irq(irq[0], host);
1036 dev_err(&pdev->dev, "request_irq error (sh_mmc:int)\n");
1037 goto clean_up2;
1038 }
1039
1040 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1041 sh_mmcif_detect(host->mmc);
1042
1043 dev_info(&pdev->dev, "driver version %s\n", DRIVER_VERSION);
1044 dev_dbg(&pdev->dev, "chip ver H'%04x\n",
1045 sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0x0000ffff);
1046 return ret;
1047
1048 clean_up2:
1049 clk_disable(host->hclk);
1050 clean_up1:
1051 mmc_free_host(mmc);
1052 clean_up:
1053 if (reg)
1054 iounmap(reg);
1055 return ret;
1056 }
1057
1058 static int __devexit sh_mmcif_remove(struct platform_device *pdev)
1059 {
1060 struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1061 int irq[2];
1062
1063 mmc_remove_host(host->mmc);
1064 sh_mmcif_release_dma(host);
1065
1066 if (host->addr)
1067 iounmap(host->addr);
1068
1069 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1070
1071 irq[0] = platform_get_irq(pdev, 0);
1072 irq[1] = platform_get_irq(pdev, 1);
1073
1074 free_irq(irq[0], host);
1075 free_irq(irq[1], host);
1076
1077 platform_set_drvdata(pdev, NULL);
1078
1079 clk_disable(host->hclk);
1080 mmc_free_host(host->mmc);
1081
1082 return 0;
1083 }
1084
1085 static struct platform_driver sh_mmcif_driver = {
1086 .probe = sh_mmcif_probe,
1087 .remove = sh_mmcif_remove,
1088 .driver = {
1089 .name = DRIVER_NAME,
1090 },
1091 };
1092
1093 static int __init sh_mmcif_init(void)
1094 {
1095 return platform_driver_register(&sh_mmcif_driver);
1096 }
1097
1098 static void __exit sh_mmcif_exit(void)
1099 {
1100 platform_driver_unregister(&sh_mmcif_driver);
1101 }
1102
1103 module_init(sh_mmcif_init);
1104 module_exit(sh_mmcif_exit);
1105
1106
1107 MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver");
1108 MODULE_LICENSE("GPL");
1109 MODULE_ALIAS("platform:" DRIVER_NAME);
1110 MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>");
linux-next