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 /*
20 * The MMCIF driver is now processing MMC requests asynchronously, according
21 * to the Linux MMC API requirement.
22 *
23 * The MMCIF driver processes MMC requests in up to 3 stages: command, optional
24 * data, and optional stop. To achieve asynchronous processing each of these
25 * stages is split into two halves: a top and a bottom half. The top half
26 * initialises the hardware, installs a timeout handler to handle completion
27 * timeouts, and returns. In case of the command stage this immediately returns
28 * control to the caller, leaving all further processing to run asynchronously.
29 * All further request processing is performed by the bottom halves.
30 *
31 * The bottom half further consists of a "hard" IRQ handler, an IRQ handler
32 * thread, a DMA completion callback, if DMA is used, a timeout work, and
33 * request- and stage-specific handler methods.
34 *
35 * Each bottom half run begins with either a hardware interrupt, a DMA callback
36 * invocation, or a timeout work run. In case of an error or a successful
37 * processing completion, the MMC core is informed and the request processing is
38 * finished. In case processing has to continue, i.e., if data has to be read
39 * from or written to the card, or if a stop command has to be sent, the next
40 * top half is called, which performs the necessary hardware handling and
41 * reschedules the timeout work. This returns the driver state machine into the
42 * bottom half waiting state.
43 */
44
45 #include <linux/bitops.h>
46 #include <linux/clk.h>
47 #include <linux/completion.h>
48 #include <linux/delay.h>
49 #include <linux/dma-mapping.h>
50 #include <linux/dmaengine.h>
51 #include <linux/mmc/card.h>
52 #include <linux/mmc/core.h>
53 #include <linux/mmc/host.h>
54 #include <linux/mmc/mmc.h>
55 #include <linux/mmc/sdio.h>
56 #include <linux/mmc/sh_mmcif.h>
57 #include <linux/pagemap.h>
58 #include <linux/platform_device.h>
59 #include <linux/pm_runtime.h>
60 #include <linux/spinlock.h>
61 #include <linux/module.h>
62
63 #define DRIVER_NAME "sh_mmcif"
64 #define DRIVER_VERSION "2010-04-28"
65
66 /* CE_CMD_SET */
67 #define CMD_MASK 0x3f000000
68 #define CMD_SET_RTYP_NO ((0 << 23) | (0 << 22))
69 #define CMD_SET_RTYP_6B ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */
70 #define CMD_SET_RTYP_17B ((1 << 23) | (0 << 22)) /* R2 */
71 #define CMD_SET_RBSY (1 << 21) /* R1b */
72 #define CMD_SET_CCSEN (1 << 20)
73 #define CMD_SET_WDAT (1 << 19) /* 1: on data, 0: no data */
74 #define CMD_SET_DWEN (1 << 18) /* 1: write, 0: read */
75 #define CMD_SET_CMLTE (1 << 17) /* 1: multi block trans, 0: single */
76 #define CMD_SET_CMD12EN (1 << 16) /* 1: CMD12 auto issue */
77 #define CMD_SET_RIDXC_INDEX ((0 << 15) | (0 << 14)) /* index check */
78 #define CMD_SET_RIDXC_BITS ((0 << 15) | (1 << 14)) /* check bits check */
79 #define CMD_SET_RIDXC_NO ((1 << 15) | (0 << 14)) /* no check */
80 #define CMD_SET_CRC7C ((0 << 13) | (0 << 12)) /* CRC7 check*/
81 #define CMD_SET_CRC7C_BITS ((0 << 13) | (1 << 12)) /* check bits check*/
82 #define CMD_SET_CRC7C_INTERNAL ((1 << 13) | (0 << 12)) /* internal CRC7 check*/
83 #define CMD_SET_CRC16C (1 << 10) /* 0: CRC16 check*/
84 #define CMD_SET_CRCSTE (1 << 8) /* 1: not receive CRC status */
85 #define CMD_SET_TBIT (1 << 7) /* 1: tran mission bit "Low" */
86 #define CMD_SET_OPDM (1 << 6) /* 1: open/drain */
87 #define CMD_SET_CCSH (1 << 5)
88 #define CMD_SET_DATW_1 ((0 << 1) | (0 << 0)) /* 1bit */
89 #define CMD_SET_DATW_4 ((0 << 1) | (1 << 0)) /* 4bit */
90 #define CMD_SET_DATW_8 ((1 << 1) | (0 << 0)) /* 8bit */
91
92 /* CE_CMD_CTRL */
93 #define CMD_CTRL_BREAK (1 << 0)
94
95 /* CE_BLOCK_SET */
96 #define BLOCK_SIZE_MASK 0x0000ffff
97
98 /* CE_INT */
99 #define INT_CCSDE (1 << 29)
100 #define INT_CMD12DRE (1 << 26)
101 #define INT_CMD12RBE (1 << 25)
102 #define INT_CMD12CRE (1 << 24)
103 #define INT_DTRANE (1 << 23)
104 #define INT_BUFRE (1 << 22)
105 #define INT_BUFWEN (1 << 21)
106 #define INT_BUFREN (1 << 20)
107 #define INT_CCSRCV (1 << 19)
108 #define INT_RBSYE (1 << 17)
109 #define INT_CRSPE (1 << 16)
110 #define INT_CMDVIO (1 << 15)
111 #define INT_BUFVIO (1 << 14)
112 #define INT_WDATERR (1 << 11)
113 #define INT_RDATERR (1 << 10)
114 #define INT_RIDXERR (1 << 9)
115 #define INT_RSPERR (1 << 8)
116 #define INT_CCSTO (1 << 5)
117 #define INT_CRCSTO (1 << 4)
118 #define INT_WDATTO (1 << 3)
119 #define INT_RDATTO (1 << 2)
120 #define INT_RBSYTO (1 << 1)
121 #define INT_RSPTO (1 << 0)
122 #define INT_ERR_STS (INT_CMDVIO | INT_BUFVIO | INT_WDATERR | \
123 INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
124 INT_CCSTO | INT_CRCSTO | INT_WDATTO | \
125 INT_RDATTO | INT_RBSYTO | INT_RSPTO)
126
127 /* CE_INT_MASK */
128 #define MASK_ALL 0x00000000
129 #define MASK_MCCSDE (1 << 29)
130 #define MASK_MCMD12DRE (1 << 26)
131 #define MASK_MCMD12RBE (1 << 25)
132 #define MASK_MCMD12CRE (1 << 24)
133 #define MASK_MDTRANE (1 << 23)
134 #define MASK_MBUFRE (1 << 22)
135 #define MASK_MBUFWEN (1 << 21)
136 #define MASK_MBUFREN (1 << 20)
137 #define MASK_MCCSRCV (1 << 19)
138 #define MASK_MRBSYE (1 << 17)
139 #define MASK_MCRSPE (1 << 16)
140 #define MASK_MCMDVIO (1 << 15)
141 #define MASK_MBUFVIO (1 << 14)
142 #define MASK_MWDATERR (1 << 11)
143 #define MASK_MRDATERR (1 << 10)
144 #define MASK_MRIDXERR (1 << 9)
145 #define MASK_MRSPERR (1 << 8)
146 #define MASK_MCCSTO (1 << 5)
147 #define MASK_MCRCSTO (1 << 4)
148 #define MASK_MWDATTO (1 << 3)
149 #define MASK_MRDATTO (1 << 2)
150 #define MASK_MRBSYTO (1 << 1)
151 #define MASK_MRSPTO (1 << 0)
152
153 #define MASK_START_CMD (MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR | \
154 MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR | \
155 MASK_MCCSTO | MASK_MCRCSTO | MASK_MWDATTO | \
156 MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO)
157
158 /* CE_HOST_STS1 */
159 #define STS1_CMDSEQ (1 << 31)
160
161 /* CE_HOST_STS2 */
162 #define STS2_CRCSTE (1 << 31)
163 #define STS2_CRC16E (1 << 30)
164 #define STS2_AC12CRCE (1 << 29)
165 #define STS2_RSPCRC7E (1 << 28)
166 #define STS2_CRCSTEBE (1 << 27)
167 #define STS2_RDATEBE (1 << 26)
168 #define STS2_AC12REBE (1 << 25)
169 #define STS2_RSPEBE (1 << 24)
170 #define STS2_AC12IDXE (1 << 23)
171 #define STS2_RSPIDXE (1 << 22)
172 #define STS2_CCSTO (1 << 15)
173 #define STS2_RDATTO (1 << 14)
174 #define STS2_DATBSYTO (1 << 13)
175 #define STS2_CRCSTTO (1 << 12)
176 #define STS2_AC12BSYTO (1 << 11)
177 #define STS2_RSPBSYTO (1 << 10)
178 #define STS2_AC12RSPTO (1 << 9)
179 #define STS2_RSPTO (1 << 8)
180 #define STS2_CRC_ERR (STS2_CRCSTE | STS2_CRC16E | \
181 STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
182 #define STS2_TIMEOUT_ERR (STS2_CCSTO | STS2_RDATTO | \
183 STS2_DATBSYTO | STS2_CRCSTTO | \
184 STS2_AC12BSYTO | STS2_RSPBSYTO | \
185 STS2_AC12RSPTO | STS2_RSPTO)
186
187 #define CLKDEV_EMMC_DATA 52000000 /* 52MHz */
188 #define CLKDEV_MMC_DATA 20000000 /* 20MHz */
189 #define CLKDEV_INIT 400000 /* 400 KHz */
190
191 enum mmcif_state {
192 STATE_IDLE,
193 STATE_REQUEST,
194 STATE_IOS,
195 };
196
197 enum mmcif_wait_for {
198 MMCIF_WAIT_FOR_REQUEST,
199 MMCIF_WAIT_FOR_CMD,
200 MMCIF_WAIT_FOR_MREAD,
201 MMCIF_WAIT_FOR_MWRITE,
202 MMCIF_WAIT_FOR_READ,
203 MMCIF_WAIT_FOR_WRITE,
204 MMCIF_WAIT_FOR_READ_END,
205 MMCIF_WAIT_FOR_WRITE_END,
206 MMCIF_WAIT_FOR_STOP,
207 };
208
209 struct sh_mmcif_host {
210 struct mmc_host *mmc;
211 struct mmc_request *mrq;
212 struct platform_device *pd;
213 struct sh_dmae_slave dma_slave_tx;
214 struct sh_dmae_slave dma_slave_rx;
215 struct clk *hclk;
216 unsigned int clk;
217 int bus_width;
218 bool sd_error;
219 bool dying;
220 long timeout;
221 void __iomem *addr;
222 u32 *pio_ptr;
223 spinlock_t lock; /* protect sh_mmcif_host::state */
224 enum mmcif_state state;
225 enum mmcif_wait_for wait_for;
226 struct delayed_work timeout_work;
227 size_t blocksize;
228 int sg_idx;
229 int sg_blkidx;
230 bool power;
231 bool card_present;
232
233 /* DMA support */
234 struct dma_chan *chan_rx;
235 struct dma_chan *chan_tx;
236 struct completion dma_complete;
237 bool dma_active;
238 };
239
sh_mmcif_bitset(struct sh_mmcif_host * host,unsigned int reg,u32 val)240 static inline void sh_mmcif_bitset(struct sh_mmcif_host *host,
241 unsigned int reg, u32 val)
242 {
243 writel(val | readl(host->addr + reg), host->addr + reg);
244 }
245
sh_mmcif_bitclr(struct sh_mmcif_host * host,unsigned int reg,u32 val)246 static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host,
247 unsigned int reg, u32 val)
248 {
249 writel(~val & readl(host->addr + reg), host->addr + reg);
250 }
251
mmcif_dma_complete(void * arg)252 static void mmcif_dma_complete(void *arg)
253 {
254 struct sh_mmcif_host *host = arg;
255 struct mmc_data *data = host->mrq->data;
256
257 dev_dbg(&host->pd->dev, "Command completed\n");
258
259 if (WARN(!data, "%s: NULL data in DMA completion!\n",
260 dev_name(&host->pd->dev)))
261 return;
262
263 if (data->flags & MMC_DATA_READ)
264 dma_unmap_sg(host->chan_rx->device->dev,
265 data->sg, data->sg_len,
266 DMA_FROM_DEVICE);
267 else
268 dma_unmap_sg(host->chan_tx->device->dev,
269 data->sg, data->sg_len,
270 DMA_TO_DEVICE);
271
272 complete(&host->dma_complete);
273 }
274
sh_mmcif_start_dma_rx(struct sh_mmcif_host * host)275 static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
276 {
277 struct mmc_data *data = host->mrq->data;
278 struct scatterlist *sg = data->sg;
279 struct dma_async_tx_descriptor *desc = NULL;
280 struct dma_chan *chan = host->chan_rx;
281 dma_cookie_t cookie = -EINVAL;
282 int ret;
283
284 ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
285 DMA_FROM_DEVICE);
286 if (ret > 0) {
287 host->dma_active = true;
288 desc = chan->device->device_prep_slave_sg(chan, sg, ret,
289 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
290 }
291
292 if (desc) {
293 desc->callback = mmcif_dma_complete;
294 desc->callback_param = host;
295 cookie = dmaengine_submit(desc);
296 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN);
297 dma_async_issue_pending(chan);
298 }
299 dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
300 __func__, data->sg_len, ret, cookie);
301
302 if (!desc) {
303 /* DMA failed, fall back to PIO */
304 if (ret >= 0)
305 ret = -EIO;
306 host->chan_rx = NULL;
307 host->dma_active = false;
308 dma_release_channel(chan);
309 /* Free the Tx channel too */
310 chan = host->chan_tx;
311 if (chan) {
312 host->chan_tx = NULL;
313 dma_release_channel(chan);
314 }
315 dev_warn(&host->pd->dev,
316 "DMA failed: %d, falling back to PIO\n", ret);
317 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
318 }
319
320 dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
321 desc, cookie, data->sg_len);
322 }
323
sh_mmcif_start_dma_tx(struct sh_mmcif_host * host)324 static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
325 {
326 struct mmc_data *data = host->mrq->data;
327 struct scatterlist *sg = data->sg;
328 struct dma_async_tx_descriptor *desc = NULL;
329 struct dma_chan *chan = host->chan_tx;
330 dma_cookie_t cookie = -EINVAL;
331 int ret;
332
333 ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
334 DMA_TO_DEVICE);
335 if (ret > 0) {
336 host->dma_active = true;
337 desc = chan->device->device_prep_slave_sg(chan, sg, ret,
338 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
339 }
340
341 if (desc) {
342 desc->callback = mmcif_dma_complete;
343 desc->callback_param = host;
344 cookie = dmaengine_submit(desc);
345 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN);
346 dma_async_issue_pending(chan);
347 }
348 dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
349 __func__, data->sg_len, ret, cookie);
350
351 if (!desc) {
352 /* DMA failed, fall back to PIO */
353 if (ret >= 0)
354 ret = -EIO;
355 host->chan_tx = NULL;
356 host->dma_active = false;
357 dma_release_channel(chan);
358 /* Free the Rx channel too */
359 chan = host->chan_rx;
360 if (chan) {
361 host->chan_rx = NULL;
362 dma_release_channel(chan);
363 }
364 dev_warn(&host->pd->dev,
365 "DMA failed: %d, falling back to PIO\n", ret);
366 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
367 }
368
369 dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d\n", __func__,
370 desc, cookie);
371 }
372
sh_mmcif_filter(struct dma_chan * chan,void * arg)373 static bool sh_mmcif_filter(struct dma_chan *chan, void *arg)
374 {
375 dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
376 chan->private = arg;
377 return true;
378 }
379
sh_mmcif_request_dma(struct sh_mmcif_host * host,struct sh_mmcif_plat_data * pdata)380 static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
381 struct sh_mmcif_plat_data *pdata)
382 {
383 struct sh_dmae_slave *tx, *rx;
384 host->dma_active = false;
385
386 /* We can only either use DMA for both Tx and Rx or not use it at all */
387 if (pdata->dma) {
388 dev_warn(&host->pd->dev,
389 "Update your platform to use embedded DMA slave IDs\n");
390 tx = &pdata->dma->chan_priv_tx;
391 rx = &pdata->dma->chan_priv_rx;
392 } else {
393 tx = &host->dma_slave_tx;
394 tx->slave_id = pdata->slave_id_tx;
395 rx = &host->dma_slave_rx;
396 rx->slave_id = pdata->slave_id_rx;
397 }
398 if (tx->slave_id > 0 && rx->slave_id > 0) {
399 dma_cap_mask_t mask;
400
401 dma_cap_zero(mask);
402 dma_cap_set(DMA_SLAVE, mask);
403
404 host->chan_tx = dma_request_channel(mask, sh_mmcif_filter, tx);
405 dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
406 host->chan_tx);
407
408 if (!host->chan_tx)
409 return;
410
411 host->chan_rx = dma_request_channel(mask, sh_mmcif_filter, rx);
412 dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
413 host->chan_rx);
414
415 if (!host->chan_rx) {
416 dma_release_channel(host->chan_tx);
417 host->chan_tx = NULL;
418 return;
419 }
420
421 init_completion(&host->dma_complete);
422 }
423 }
424
sh_mmcif_release_dma(struct sh_mmcif_host * host)425 static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
426 {
427 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
428 /* Descriptors are freed automatically */
429 if (host->chan_tx) {
430 struct dma_chan *chan = host->chan_tx;
431 host->chan_tx = NULL;
432 dma_release_channel(chan);
433 }
434 if (host->chan_rx) {
435 struct dma_chan *chan = host->chan_rx;
436 host->chan_rx = NULL;
437 dma_release_channel(chan);
438 }
439
440 host->dma_active = false;
441 }
442
sh_mmcif_clock_control(struct sh_mmcif_host * host,unsigned int clk)443 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
444 {
445 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
446
447 sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
448 sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
449
450 if (!clk)
451 return;
452 if (p->sup_pclk && clk == host->clk)
453 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
454 else
455 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
456 ((fls(host->clk / clk) - 1) << 16));
457
458 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
459 }
460
sh_mmcif_sync_reset(struct sh_mmcif_host * host)461 static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
462 {
463 u32 tmp;
464
465 tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL);
466
467 sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON);
468 sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
469 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
470 SRSPTO_256 | SRBSYTO_29 | SRWDTO_29 | SCCSTO_29);
471 /* byte swap on */
472 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
473 }
474
sh_mmcif_error_manage(struct sh_mmcif_host * host)475 static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
476 {
477 u32 state1, state2;
478 int ret, timeout;
479
480 host->sd_error = false;
481
482 state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1);
483 state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2);
484 dev_dbg(&host->pd->dev, "ERR HOST_STS1 = %08x\n", state1);
485 dev_dbg(&host->pd->dev, "ERR HOST_STS2 = %08x\n", state2);
486
487 if (state1 & STS1_CMDSEQ) {
488 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK);
489 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK);
490 for (timeout = 10000000; timeout; timeout--) {
491 if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1)
492 & STS1_CMDSEQ))
493 break;
494 mdelay(1);
495 }
496 if (!timeout) {
497 dev_err(&host->pd->dev,
498 "Forced end of command sequence timeout err\n");
499 return -EIO;
500 }
501 sh_mmcif_sync_reset(host);
502 dev_dbg(&host->pd->dev, "Forced end of command sequence\n");
503 return -EIO;
504 }
505
506 if (state2 & STS2_CRC_ERR) {
507 dev_dbg(&host->pd->dev, ": CRC error\n");
508 ret = -EIO;
509 } else if (state2 & STS2_TIMEOUT_ERR) {
510 dev_dbg(&host->pd->dev, ": Timeout\n");
511 ret = -ETIMEDOUT;
512 } else {
513 dev_dbg(&host->pd->dev, ": End/Index error\n");
514 ret = -EIO;
515 }
516 return ret;
517 }
518
sh_mmcif_next_block(struct sh_mmcif_host * host,u32 * p)519 static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
520 {
521 struct mmc_data *data = host->mrq->data;
522
523 host->sg_blkidx += host->blocksize;
524
525 /* data->sg->length must be a multiple of host->blocksize? */
526 BUG_ON(host->sg_blkidx > data->sg->length);
527
528 if (host->sg_blkidx == data->sg->length) {
529 host->sg_blkidx = 0;
530 if (++host->sg_idx < data->sg_len)
531 host->pio_ptr = sg_virt(++data->sg);
532 } else {
533 host->pio_ptr = p;
534 }
535
536 if (host->sg_idx == data->sg_len)
537 return false;
538
539 return true;
540 }
541
sh_mmcif_single_read(struct sh_mmcif_host * host,struct mmc_request * mrq)542 static void sh_mmcif_single_read(struct sh_mmcif_host *host,
543 struct mmc_request *mrq)
544 {
545 host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
546 BLOCK_SIZE_MASK) + 3;
547
548 host->wait_for = MMCIF_WAIT_FOR_READ;
549 schedule_delayed_work(&host->timeout_work, host->timeout);
550
551 /* buf read enable */
552 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
553 }
554
sh_mmcif_read_block(struct sh_mmcif_host * host)555 static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
556 {
557 struct mmc_data *data = host->mrq->data;
558 u32 *p = sg_virt(data->sg);
559 int i;
560
561 if (host->sd_error) {
562 data->error = sh_mmcif_error_manage(host);
563 return false;
564 }
565
566 for (i = 0; i < host->blocksize / 4; i++)
567 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
568
569 /* buffer read end */
570 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
571 host->wait_for = MMCIF_WAIT_FOR_READ_END;
572
573 return true;
574 }
575
sh_mmcif_multi_read(struct sh_mmcif_host * host,struct mmc_request * mrq)576 static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
577 struct mmc_request *mrq)
578 {
579 struct mmc_data *data = mrq->data;
580
581 if (!data->sg_len || !data->sg->length)
582 return;
583
584 host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
585 BLOCK_SIZE_MASK;
586
587 host->wait_for = MMCIF_WAIT_FOR_MREAD;
588 host->sg_idx = 0;
589 host->sg_blkidx = 0;
590 host->pio_ptr = sg_virt(data->sg);
591 schedule_delayed_work(&host->timeout_work, host->timeout);
592 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
593 }
594
sh_mmcif_mread_block(struct sh_mmcif_host * host)595 static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
596 {
597 struct mmc_data *data = host->mrq->data;
598 u32 *p = host->pio_ptr;
599 int i;
600
601 if (host->sd_error) {
602 data->error = sh_mmcif_error_manage(host);
603 return false;
604 }
605
606 BUG_ON(!data->sg->length);
607
608 for (i = 0; i < host->blocksize / 4; i++)
609 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
610
611 if (!sh_mmcif_next_block(host, p))
612 return false;
613
614 schedule_delayed_work(&host->timeout_work, host->timeout);
615 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
616
617 return true;
618 }
619
sh_mmcif_single_write(struct sh_mmcif_host * host,struct mmc_request * mrq)620 static void sh_mmcif_single_write(struct sh_mmcif_host *host,
621 struct mmc_request *mrq)
622 {
623 host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
624 BLOCK_SIZE_MASK) + 3;
625
626 host->wait_for = MMCIF_WAIT_FOR_WRITE;
627 schedule_delayed_work(&host->timeout_work, host->timeout);
628
629 /* buf write enable */
630 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
631 }
632
sh_mmcif_write_block(struct sh_mmcif_host * host)633 static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
634 {
635 struct mmc_data *data = host->mrq->data;
636 u32 *p = sg_virt(data->sg);
637 int i;
638
639 if (host->sd_error) {
640 data->error = sh_mmcif_error_manage(host);
641 return false;
642 }
643
644 for (i = 0; i < host->blocksize / 4; i++)
645 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
646
647 /* buffer write end */
648 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
649 host->wait_for = MMCIF_WAIT_FOR_WRITE_END;
650
651 return true;
652 }
653
sh_mmcif_multi_write(struct sh_mmcif_host * host,struct mmc_request * mrq)654 static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
655 struct mmc_request *mrq)
656 {
657 struct mmc_data *data = mrq->data;
658
659 if (!data->sg_len || !data->sg->length)
660 return;
661
662 host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
663 BLOCK_SIZE_MASK;
664
665 host->wait_for = MMCIF_WAIT_FOR_MWRITE;
666 host->sg_idx = 0;
667 host->sg_blkidx = 0;
668 host->pio_ptr = sg_virt(data->sg);
669 schedule_delayed_work(&host->timeout_work, host->timeout);
670 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
671 }
672
sh_mmcif_mwrite_block(struct sh_mmcif_host * host)673 static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
674 {
675 struct mmc_data *data = host->mrq->data;
676 u32 *p = host->pio_ptr;
677 int i;
678
679 if (host->sd_error) {
680 data->error = sh_mmcif_error_manage(host);
681 return false;
682 }
683
684 BUG_ON(!data->sg->length);
685
686 for (i = 0; i < host->blocksize / 4; i++)
687 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
688
689 if (!sh_mmcif_next_block(host, p))
690 return false;
691
692 schedule_delayed_work(&host->timeout_work, host->timeout);
693 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
694
695 return true;
696 }
697
sh_mmcif_get_response(struct sh_mmcif_host * host,struct mmc_command * cmd)698 static void sh_mmcif_get_response(struct sh_mmcif_host *host,
699 struct mmc_command *cmd)
700 {
701 if (cmd->flags & MMC_RSP_136) {
702 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3);
703 cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2);
704 cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1);
705 cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
706 } else
707 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
708 }
709
sh_mmcif_get_cmd12response(struct sh_mmcif_host * host,struct mmc_command * cmd)710 static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
711 struct mmc_command *cmd)
712 {
713 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12);
714 }
715
sh_mmcif_set_cmd(struct sh_mmcif_host * host,struct mmc_request * mrq)716 static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
717 struct mmc_request *mrq)
718 {
719 struct mmc_data *data = mrq->data;
720 struct mmc_command *cmd = mrq->cmd;
721 u32 opc = cmd->opcode;
722 u32 tmp = 0;
723
724 /* Response Type check */
725 switch (mmc_resp_type(cmd)) {
726 case MMC_RSP_NONE:
727 tmp |= CMD_SET_RTYP_NO;
728 break;
729 case MMC_RSP_R1:
730 case MMC_RSP_R1B:
731 case MMC_RSP_R3:
732 tmp |= CMD_SET_RTYP_6B;
733 break;
734 case MMC_RSP_R2:
735 tmp |= CMD_SET_RTYP_17B;
736 break;
737 default:
738 dev_err(&host->pd->dev, "Unsupported response type.\n");
739 break;
740 }
741 switch (opc) {
742 /* RBSY */
743 case MMC_SWITCH:
744 case MMC_STOP_TRANSMISSION:
745 case MMC_SET_WRITE_PROT:
746 case MMC_CLR_WRITE_PROT:
747 case MMC_ERASE:
748 case MMC_GEN_CMD:
749 tmp |= CMD_SET_RBSY;
750 break;
751 }
752 /* WDAT / DATW */
753 if (data) {
754 tmp |= CMD_SET_WDAT;
755 switch (host->bus_width) {
756 case MMC_BUS_WIDTH_1:
757 tmp |= CMD_SET_DATW_1;
758 break;
759 case MMC_BUS_WIDTH_4:
760 tmp |= CMD_SET_DATW_4;
761 break;
762 case MMC_BUS_WIDTH_8:
763 tmp |= CMD_SET_DATW_8;
764 break;
765 default:
766 dev_err(&host->pd->dev, "Unsupported bus width.\n");
767 break;
768 }
769 }
770 /* DWEN */
771 if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK)
772 tmp |= CMD_SET_DWEN;
773 /* CMLTE/CMD12EN */
774 if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) {
775 tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
776 sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET,
777 data->blocks << 16);
778 }
779 /* RIDXC[1:0] check bits */
780 if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID ||
781 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
782 tmp |= CMD_SET_RIDXC_BITS;
783 /* RCRC7C[1:0] check bits */
784 if (opc == MMC_SEND_OP_COND)
785 tmp |= CMD_SET_CRC7C_BITS;
786 /* RCRC7C[1:0] internal CRC7 */
787 if (opc == MMC_ALL_SEND_CID ||
788 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
789 tmp |= CMD_SET_CRC7C_INTERNAL;
790
791 return (opc << 24) | tmp;
792 }
793
sh_mmcif_data_trans(struct sh_mmcif_host * host,struct mmc_request * mrq,u32 opc)794 static int sh_mmcif_data_trans(struct sh_mmcif_host *host,
795 struct mmc_request *mrq, u32 opc)
796 {
797 switch (opc) {
798 case MMC_READ_MULTIPLE_BLOCK:
799 sh_mmcif_multi_read(host, mrq);
800 return 0;
801 case MMC_WRITE_MULTIPLE_BLOCK:
802 sh_mmcif_multi_write(host, mrq);
803 return 0;
804 case MMC_WRITE_BLOCK:
805 sh_mmcif_single_write(host, mrq);
806 return 0;
807 case MMC_READ_SINGLE_BLOCK:
808 case MMC_SEND_EXT_CSD:
809 sh_mmcif_single_read(host, mrq);
810 return 0;
811 default:
812 dev_err(&host->pd->dev, "UNSUPPORTED CMD = d'%08d\n", opc);
813 return -EINVAL;
814 }
815 }
816
sh_mmcif_start_cmd(struct sh_mmcif_host * host,struct mmc_request * mrq)817 static void sh_mmcif_start_cmd(struct sh_mmcif_host *host,
818 struct mmc_request *mrq)
819 {
820 struct mmc_command *cmd = mrq->cmd;
821 u32 opc = cmd->opcode;
822 u32 mask;
823
824 switch (opc) {
825 /* response busy check */
826 case MMC_SWITCH:
827 case MMC_STOP_TRANSMISSION:
828 case MMC_SET_WRITE_PROT:
829 case MMC_CLR_WRITE_PROT:
830 case MMC_ERASE:
831 case MMC_GEN_CMD:
832 mask = MASK_START_CMD | MASK_MRBSYE;
833 break;
834 default:
835 mask = MASK_START_CMD | MASK_MCRSPE;
836 break;
837 }
838
839 if (mrq->data) {
840 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0);
841 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET,
842 mrq->data->blksz);
843 }
844 opc = sh_mmcif_set_cmd(host, mrq);
845
846 sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0);
847 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask);
848 /* set arg */
849 sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
850 /* set cmd */
851 sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
852
853 host->wait_for = MMCIF_WAIT_FOR_CMD;
854 schedule_delayed_work(&host->timeout_work, host->timeout);
855 }
856
sh_mmcif_stop_cmd(struct sh_mmcif_host * host,struct mmc_request * mrq)857 static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
858 struct mmc_request *mrq)
859 {
860 switch (mrq->cmd->opcode) {
861 case MMC_READ_MULTIPLE_BLOCK:
862 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
863 break;
864 case MMC_WRITE_MULTIPLE_BLOCK:
865 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
866 break;
867 default:
868 dev_err(&host->pd->dev, "unsupported stop cmd\n");
869 mrq->stop->error = sh_mmcif_error_manage(host);
870 return;
871 }
872
873 host->wait_for = MMCIF_WAIT_FOR_STOP;
874 schedule_delayed_work(&host->timeout_work, host->timeout);
875 }
876
sh_mmcif_request(struct mmc_host * mmc,struct mmc_request * mrq)877 static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq)
878 {
879 struct sh_mmcif_host *host = mmc_priv(mmc);
880 unsigned long flags;
881
882 spin_lock_irqsave(&host->lock, flags);
883 if (host->state != STATE_IDLE) {
884 spin_unlock_irqrestore(&host->lock, flags);
885 mrq->cmd->error = -EAGAIN;
886 mmc_request_done(mmc, mrq);
887 return;
888 }
889
890 host->state = STATE_REQUEST;
891 spin_unlock_irqrestore(&host->lock, flags);
892
893 switch (mrq->cmd->opcode) {
894 /* MMCIF does not support SD/SDIO command */
895 case SD_IO_SEND_OP_COND:
896 case MMC_APP_CMD:
897 host->state = STATE_IDLE;
898 mrq->cmd->error = -ETIMEDOUT;
899 mmc_request_done(mmc, mrq);
900 return;
901 case MMC_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
902 if (!mrq->data) {
903 /* send_if_cond cmd (not support) */
904 host->state = STATE_IDLE;
905 mrq->cmd->error = -ETIMEDOUT;
906 mmc_request_done(mmc, mrq);
907 return;
908 }
909 break;
910 default:
911 break;
912 }
913
914 host->mrq = mrq;
915
916 sh_mmcif_start_cmd(host, mrq);
917 }
918
sh_mmcif_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)919 static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
920 {
921 struct sh_mmcif_host *host = mmc_priv(mmc);
922 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
923 unsigned long flags;
924
925 spin_lock_irqsave(&host->lock, flags);
926 if (host->state != STATE_IDLE) {
927 spin_unlock_irqrestore(&host->lock, flags);
928 return;
929 }
930
931 host->state = STATE_IOS;
932 spin_unlock_irqrestore(&host->lock, flags);
933
934 if (ios->power_mode == MMC_POWER_UP) {
935 if (!host->card_present) {
936 /* See if we also get DMA */
937 sh_mmcif_request_dma(host, host->pd->dev.platform_data);
938 host->card_present = true;
939 }
940 } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
941 /* clock stop */
942 sh_mmcif_clock_control(host, 0);
943 if (ios->power_mode == MMC_POWER_OFF) {
944 if (host->card_present) {
945 sh_mmcif_release_dma(host);
946 host->card_present = false;
947 }
948 }
949 if (host->power) {
950 pm_runtime_put(&host->pd->dev);
951 host->power = false;
952 if (p->down_pwr && ios->power_mode == MMC_POWER_OFF)
953 p->down_pwr(host->pd);
954 }
955 host->state = STATE_IDLE;
956 return;
957 }
958
959 if (ios->clock) {
960 if (!host->power) {
961 if (p->set_pwr)
962 p->set_pwr(host->pd, ios->power_mode);
963 pm_runtime_get_sync(&host->pd->dev);
964 host->power = true;
965 sh_mmcif_sync_reset(host);
966 }
967 sh_mmcif_clock_control(host, ios->clock);
968 }
969
970 host->bus_width = ios->bus_width;
971 host->state = STATE_IDLE;
972 }
973
sh_mmcif_get_cd(struct mmc_host * mmc)974 static int sh_mmcif_get_cd(struct mmc_host *mmc)
975 {
976 struct sh_mmcif_host *host = mmc_priv(mmc);
977 struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
978
979 if (!p->get_cd)
980 return -ENOSYS;
981 else
982 return p->get_cd(host->pd);
983 }
984
985 static struct mmc_host_ops sh_mmcif_ops = {
986 .request = sh_mmcif_request,
987 .set_ios = sh_mmcif_set_ios,
988 .get_cd = sh_mmcif_get_cd,
989 };
990
sh_mmcif_end_cmd(struct sh_mmcif_host * host)991 static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
992 {
993 struct mmc_command *cmd = host->mrq->cmd;
994 struct mmc_data *data = host->mrq->data;
995 long time;
996
997 if (host->sd_error) {
998 switch (cmd->opcode) {
999 case MMC_ALL_SEND_CID:
1000 case MMC_SELECT_CARD:
1001 case MMC_APP_CMD:
1002 cmd->error = -ETIMEDOUT;
1003 host->sd_error = false;
1004 break;
1005 default:
1006 cmd->error = sh_mmcif_error_manage(host);
1007 dev_dbg(&host->pd->dev, "Cmd(d'%d) error %d\n",
1008 cmd->opcode, cmd->error);
1009 break;
1010 }
1011 return false;
1012 }
1013 if (!(cmd->flags & MMC_RSP_PRESENT)) {
1014 cmd->error = 0;
1015 return false;
1016 }
1017
1018 sh_mmcif_get_response(host, cmd);
1019
1020 if (!data)
1021 return false;
1022
1023 if (data->flags & MMC_DATA_READ) {
1024 if (host->chan_rx)
1025 sh_mmcif_start_dma_rx(host);
1026 } else {
1027 if (host->chan_tx)
1028 sh_mmcif_start_dma_tx(host);
1029 }
1030
1031 if (!host->dma_active) {
1032 data->error = sh_mmcif_data_trans(host, host->mrq, cmd->opcode);
1033 if (!data->error)
1034 return true;
1035 return false;
1036 }
1037
1038 /* Running in the IRQ thread, can sleep */
1039 time = wait_for_completion_interruptible_timeout(&host->dma_complete,
1040 host->timeout);
1041 if (host->sd_error) {
1042 dev_err(host->mmc->parent,
1043 "Error IRQ while waiting for DMA completion!\n");
1044 /* Woken up by an error IRQ: abort DMA */
1045 if (data->flags & MMC_DATA_READ)
1046 dmaengine_terminate_all(host->chan_rx);
1047 else
1048 dmaengine_terminate_all(host->chan_tx);
1049 data->error = sh_mmcif_error_manage(host);
1050 } else if (!time) {
1051 data->error = -ETIMEDOUT;
1052 } else if (time < 0) {
1053 data->error = time;
1054 }
1055 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC,
1056 BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
1057 host->dma_active = false;
1058
1059 if (data->error)
1060 data->bytes_xfered = 0;
1061
1062 return false;
1063 }
1064
sh_mmcif_irqt(int irq,void * dev_id)1065 static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
1066 {
1067 struct sh_mmcif_host *host = dev_id;
1068 struct mmc_request *mrq = host->mrq;
1069 struct mmc_data *data = mrq->data;
1070
1071 cancel_delayed_work_sync(&host->timeout_work);
1072
1073 /*
1074 * All handlers return true, if processing continues, and false, if the
1075 * request has to be completed - successfully or not
1076 */
1077 switch (host->wait_for) {
1078 case MMCIF_WAIT_FOR_REQUEST:
1079 /* We're too late, the timeout has already kicked in */
1080 return IRQ_HANDLED;
1081 case MMCIF_WAIT_FOR_CMD:
1082 if (sh_mmcif_end_cmd(host))
1083 /* Wait for data */
1084 return IRQ_HANDLED;
1085 break;
1086 case MMCIF_WAIT_FOR_MREAD:
1087 if (sh_mmcif_mread_block(host))
1088 /* Wait for more data */
1089 return IRQ_HANDLED;
1090 break;
1091 case MMCIF_WAIT_FOR_READ:
1092 if (sh_mmcif_read_block(host))
1093 /* Wait for data end */
1094 return IRQ_HANDLED;
1095 break;
1096 case MMCIF_WAIT_FOR_MWRITE:
1097 if (sh_mmcif_mwrite_block(host))
1098 /* Wait data to write */
1099 return IRQ_HANDLED;
1100 break;
1101 case MMCIF_WAIT_FOR_WRITE:
1102 if (sh_mmcif_write_block(host))
1103 /* Wait for data end */
1104 return IRQ_HANDLED;
1105 break;
1106 case MMCIF_WAIT_FOR_STOP:
1107 if (host->sd_error) {
1108 mrq->stop->error = sh_mmcif_error_manage(host);
1109 break;
1110 }
1111 sh_mmcif_get_cmd12response(host, mrq->stop);
1112 mrq->stop->error = 0;
1113 break;
1114 case MMCIF_WAIT_FOR_READ_END:
1115 case MMCIF_WAIT_FOR_WRITE_END:
1116 if (host->sd_error)
1117 data->error = sh_mmcif_error_manage(host);
1118 break;
1119 default:
1120 BUG();
1121 }
1122
1123 if (host->wait_for != MMCIF_WAIT_FOR_STOP) {
1124 if (!mrq->cmd->error && data && !data->error)
1125 data->bytes_xfered =
1126 data->blocks * data->blksz;
1127
1128 if (mrq->stop && !mrq->cmd->error && (!data || !data->error)) {
1129 sh_mmcif_stop_cmd(host, mrq);
1130 if (!mrq->stop->error)
1131 return IRQ_HANDLED;
1132 }
1133 }
1134
1135 host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1136 host->state = STATE_IDLE;
1137 host->mrq = NULL;
1138 mmc_request_done(host->mmc, mrq);
1139
1140 return IRQ_HANDLED;
1141 }
1142
sh_mmcif_intr(int irq,void * dev_id)1143 static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
1144 {
1145 struct sh_mmcif_host *host = dev_id;
1146 u32 state;
1147 int err = 0;
1148
1149 state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
1150
1151 if (state & INT_ERR_STS) {
1152 /* error interrupts - process first */
1153 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
1154 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
1155 err = 1;
1156 } else if (state & INT_RBSYE) {
1157 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1158 ~(INT_RBSYE | INT_CRSPE));
1159 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MRBSYE);
1160 } else if (state & INT_CRSPE) {
1161 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_CRSPE);
1162 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCRSPE);
1163 } else if (state & INT_BUFREN) {
1164 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFREN);
1165 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
1166 } else if (state & INT_BUFWEN) {
1167 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFWEN);
1168 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
1169 } else if (state & INT_CMD12DRE) {
1170 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1171 ~(INT_CMD12DRE | INT_CMD12RBE |
1172 INT_CMD12CRE | INT_BUFRE));
1173 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
1174 } else if (state & INT_BUFRE) {
1175 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFRE);
1176 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
1177 } else if (state & INT_DTRANE) {
1178 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_DTRANE);
1179 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
1180 } else if (state & INT_CMD12RBE) {
1181 sh_mmcif_writel(host->addr, MMCIF_CE_INT,
1182 ~(INT_CMD12RBE | INT_CMD12CRE));
1183 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
1184 } else {
1185 dev_dbg(&host->pd->dev, "Unsupported interrupt: 0x%x\n", state);
1186 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
1187 sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
1188 err = 1;
1189 }
1190 if (err) {
1191 host->sd_error = true;
1192 dev_dbg(&host->pd->dev, "int err state = %08x\n", state);
1193 }
1194 if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
1195 if (!host->dma_active)
1196 return IRQ_WAKE_THREAD;
1197 else if (host->sd_error)
1198 mmcif_dma_complete(host);
1199 } else {
1200 dev_dbg(&host->pd->dev, "Unexpected IRQ 0x%x\n", state);
1201 }
1202
1203 return IRQ_HANDLED;
1204 }
1205
mmcif_timeout_work(struct work_struct * work)1206 static void mmcif_timeout_work(struct work_struct *work)
1207 {
1208 struct delayed_work *d = container_of(work, struct delayed_work, work);
1209 struct sh_mmcif_host *host = container_of(d, struct sh_mmcif_host, timeout_work);
1210 struct mmc_request *mrq = host->mrq;
1211
1212 if (host->dying)
1213 /* Don't run after mmc_remove_host() */
1214 return;
1215
1216 /*
1217 * Handle races with cancel_delayed_work(), unless
1218 * cancel_delayed_work_sync() is used
1219 */
1220 switch (host->wait_for) {
1221 case MMCIF_WAIT_FOR_CMD:
1222 mrq->cmd->error = sh_mmcif_error_manage(host);
1223 break;
1224 case MMCIF_WAIT_FOR_STOP:
1225 mrq->stop->error = sh_mmcif_error_manage(host);
1226 break;
1227 case MMCIF_WAIT_FOR_MREAD:
1228 case MMCIF_WAIT_FOR_MWRITE:
1229 case MMCIF_WAIT_FOR_READ:
1230 case MMCIF_WAIT_FOR_WRITE:
1231 case MMCIF_WAIT_FOR_READ_END:
1232 case MMCIF_WAIT_FOR_WRITE_END:
1233 mrq->data->error = sh_mmcif_error_manage(host);
1234 break;
1235 default:
1236 BUG();
1237 }
1238
1239 host->state = STATE_IDLE;
1240 host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1241 host->mrq = NULL;
1242 mmc_request_done(host->mmc, mrq);
1243 }
1244
sh_mmcif_probe(struct platform_device * pdev)1245 static int __devinit sh_mmcif_probe(struct platform_device *pdev)
1246 {
1247 int ret = 0, irq[2];
1248 struct mmc_host *mmc;
1249 struct sh_mmcif_host *host;
1250 struct sh_mmcif_plat_data *pd;
1251 struct resource *res;
1252 void __iomem *reg;
1253 char clk_name[8];
1254
1255 irq[0] = platform_get_irq(pdev, 0);
1256 irq[1] = platform_get_irq(pdev, 1);
1257 if (irq[0] < 0 || irq[1] < 0) {
1258 dev_err(&pdev->dev, "Get irq error\n");
1259 return -ENXIO;
1260 }
1261 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1262 if (!res) {
1263 dev_err(&pdev->dev, "platform_get_resource error.\n");
1264 return -ENXIO;
1265 }
1266 reg = ioremap(res->start, resource_size(res));
1267 if (!reg) {
1268 dev_err(&pdev->dev, "ioremap error.\n");
1269 return -ENOMEM;
1270 }
1271 pd = pdev->dev.platform_data;
1272 if (!pd) {
1273 dev_err(&pdev->dev, "sh_mmcif plat data error.\n");
1274 ret = -ENXIO;
1275 goto clean_up;
1276 }
1277 mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), &pdev->dev);
1278 if (!mmc) {
1279 ret = -ENOMEM;
1280 goto clean_up;
1281 }
1282 host = mmc_priv(mmc);
1283 host->mmc = mmc;
1284 host->addr = reg;
1285 host->timeout = 1000;
1286
1287 snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);
1288 host->hclk = clk_get(&pdev->dev, clk_name);
1289 if (IS_ERR(host->hclk)) {
1290 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
1291 ret = PTR_ERR(host->hclk);
1292 goto clean_up1;
1293 }
1294 clk_enable(host->hclk);
1295 host->clk = clk_get_rate(host->hclk);
1296 host->pd = pdev;
1297
1298 spin_lock_init(&host->lock);
1299
1300 mmc->ops = &sh_mmcif_ops;
1301 mmc->f_max = host->clk;
1302 /* close to 400KHz */
1303 if (mmc->f_max < 51200000)
1304 mmc->f_min = mmc->f_max / 128;
1305 else if (mmc->f_max < 102400000)
1306 mmc->f_min = mmc->f_max / 256;
1307 else
1308 mmc->f_min = mmc->f_max / 512;
1309 if (pd->ocr)
1310 mmc->ocr_avail = pd->ocr;
1311 mmc->caps = MMC_CAP_MMC_HIGHSPEED;
1312 if (pd->caps)
1313 mmc->caps |= pd->caps;
1314 mmc->max_segs = 32;
1315 mmc->max_blk_size = 512;
1316 mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs;
1317 mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
1318 mmc->max_seg_size = mmc->max_req_size;
1319
1320 sh_mmcif_sync_reset(host);
1321 platform_set_drvdata(pdev, host);
1322
1323 pm_runtime_enable(&pdev->dev);
1324 host->power = false;
1325
1326 ret = pm_runtime_resume(&pdev->dev);
1327 if (ret < 0)
1328 goto clean_up2;
1329
1330 INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
1331
1332 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1333
1334 ret = request_threaded_irq(irq[0], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:error", host);
1335 if (ret) {
1336 dev_err(&pdev->dev, "request_irq error (sh_mmc:error)\n");
1337 goto clean_up3;
1338 }
1339 ret = request_threaded_irq(irq[1], sh_mmcif_intr, sh_mmcif_irqt, 0, "sh_mmc:int", host);
1340 if (ret) {
1341 dev_err(&pdev->dev, "request_irq error (sh_mmc:int)\n");
1342 goto clean_up4;
1343 }
1344
1345 ret = mmc_add_host(mmc);
1346 if (ret < 0)
1347 goto clean_up5;
1348
1349 dev_info(&pdev->dev, "driver version %s\n", DRIVER_VERSION);
1350 dev_dbg(&pdev->dev, "chip ver H'%04x\n",
1351 sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0x0000ffff);
1352 return ret;
1353
1354 clean_up5:
1355 free_irq(irq[1], host);
1356 clean_up4:
1357 free_irq(irq[0], host);
1358 clean_up3:
1359 pm_runtime_suspend(&pdev->dev);
1360 clean_up2:
1361 pm_runtime_disable(&pdev->dev);
1362 clk_disable(host->hclk);
1363 clean_up1:
1364 mmc_free_host(mmc);
1365 clean_up:
1366 if (reg)
1367 iounmap(reg);
1368 return ret;
1369 }
1370
sh_mmcif_remove(struct platform_device * pdev)1371 static int __devexit sh_mmcif_remove(struct platform_device *pdev)
1372 {
1373 struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1374 int irq[2];
1375
1376 host->dying = true;
1377 pm_runtime_get_sync(&pdev->dev);
1378
1379 mmc_remove_host(host->mmc);
1380 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1381
1382 /*
1383 * FIXME: cancel_delayed_work(_sync)() and free_irq() race with the
1384 * mmc_remove_host() call above. But swapping order doesn't help either
1385 * (a query on the linux-mmc mailing list didn't bring any replies).
1386 */
1387 cancel_delayed_work_sync(&host->timeout_work);
1388
1389 if (host->addr)
1390 iounmap(host->addr);
1391
1392 irq[0] = platform_get_irq(pdev, 0);
1393 irq[1] = platform_get_irq(pdev, 1);
1394
1395 free_irq(irq[0], host);
1396 free_irq(irq[1], host);
1397
1398 platform_set_drvdata(pdev, NULL);
1399
1400 clk_disable(host->hclk);
1401 mmc_free_host(host->mmc);
1402 pm_runtime_put_sync(&pdev->dev);
1403 pm_runtime_disable(&pdev->dev);
1404
1405 return 0;
1406 }
1407
1408 #ifdef CONFIG_PM
sh_mmcif_suspend(struct device * dev)1409 static int sh_mmcif_suspend(struct device *dev)
1410 {
1411 struct platform_device *pdev = to_platform_device(dev);
1412 struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1413 int ret = mmc_suspend_host(host->mmc);
1414
1415 if (!ret) {
1416 sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1417 clk_disable(host->hclk);
1418 }
1419
1420 return ret;
1421 }
1422
sh_mmcif_resume(struct device * dev)1423 static int sh_mmcif_resume(struct device *dev)
1424 {
1425 struct platform_device *pdev = to_platform_device(dev);
1426 struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1427
1428 clk_enable(host->hclk);
1429
1430 return mmc_resume_host(host->mmc);
1431 }
1432 #else
1433 #define sh_mmcif_suspend NULL
1434 #define sh_mmcif_resume NULL
1435 #endif /* CONFIG_PM */
1436
1437 static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
1438 .suspend = sh_mmcif_suspend,
1439 .resume = sh_mmcif_resume,
1440 };
1441
1442 static struct platform_driver sh_mmcif_driver = {
1443 .probe = sh_mmcif_probe,
1444 .remove = sh_mmcif_remove,
1445 .driver = {
1446 .name = DRIVER_NAME,
1447 .pm = &sh_mmcif_dev_pm_ops,
1448 },
1449 };
1450
1451 module_platform_driver(sh_mmcif_driver);
1452
1453 MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver");
1454 MODULE_LICENSE("GPL");
1455 MODULE_ALIAS("platform:" DRIVER_NAME);
1456 MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>");
1457