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Linux/drivers/mmc/host/sh_mmcif.c

  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/mmc/slot-gpio.h>
 58 #include <linux/mod_devicetable.h>
 59 #include <linux/mutex.h>
 60 #include <linux/pagemap.h>
 61 #include <linux/platform_device.h>
 62 #include <linux/pm_qos.h>
 63 #include <linux/pm_runtime.h>
 64 #include <linux/sh_dma.h>
 65 #include <linux/spinlock.h>
 66 #include <linux/module.h>
 67 
 68 #define DRIVER_NAME     "sh_mmcif"
 69 #define DRIVER_VERSION  "2010-04-28"
 70 
 71 /* CE_CMD_SET */
 72 #define CMD_MASK                0x3f000000
 73 #define CMD_SET_RTYP_NO         ((0 << 23) | (0 << 22))
 74 #define CMD_SET_RTYP_6B         ((0 << 23) | (1 << 22)) /* R1/R1b/R3/R4/R5 */
 75 #define CMD_SET_RTYP_17B        ((1 << 23) | (0 << 22)) /* R2 */
 76 #define CMD_SET_RBSY            (1 << 21) /* R1b */
 77 #define CMD_SET_CCSEN           (1 << 20)
 78 #define CMD_SET_WDAT            (1 << 19) /* 1: on data, 0: no data */
 79 #define CMD_SET_DWEN            (1 << 18) /* 1: write, 0: read */
 80 #define CMD_SET_CMLTE           (1 << 17) /* 1: multi block trans, 0: single */
 81 #define CMD_SET_CMD12EN         (1 << 16) /* 1: CMD12 auto issue */
 82 #define CMD_SET_RIDXC_INDEX     ((0 << 15) | (0 << 14)) /* index check */
 83 #define CMD_SET_RIDXC_BITS      ((0 << 15) | (1 << 14)) /* check bits check */
 84 #define CMD_SET_RIDXC_NO        ((1 << 15) | (0 << 14)) /* no check */
 85 #define CMD_SET_CRC7C           ((0 << 13) | (0 << 12)) /* CRC7 check*/
 86 #define CMD_SET_CRC7C_BITS      ((0 << 13) | (1 << 12)) /* check bits check*/
 87 #define CMD_SET_CRC7C_INTERNAL  ((1 << 13) | (0 << 12)) /* internal CRC7 check*/
 88 #define CMD_SET_CRC16C          (1 << 10) /* 0: CRC16 check*/
 89 #define CMD_SET_CRCSTE          (1 << 8) /* 1: not receive CRC status */
 90 #define CMD_SET_TBIT            (1 << 7) /* 1: tran mission bit "Low" */
 91 #define CMD_SET_OPDM            (1 << 6) /* 1: open/drain */
 92 #define CMD_SET_CCSH            (1 << 5)
 93 #define CMD_SET_DARS            (1 << 2) /* Dual Data Rate */
 94 #define CMD_SET_DATW_1          ((0 << 1) | (0 << 0)) /* 1bit */
 95 #define CMD_SET_DATW_4          ((0 << 1) | (1 << 0)) /* 4bit */
 96 #define CMD_SET_DATW_8          ((1 << 1) | (0 << 0)) /* 8bit */
 97 
 98 /* CE_CMD_CTRL */
 99 #define CMD_CTRL_BREAK          (1 << 0)
100 
101 /* CE_BLOCK_SET */
102 #define BLOCK_SIZE_MASK         0x0000ffff
103 
104 /* CE_INT */
105 #define INT_CCSDE               (1 << 29)
106 #define INT_CMD12DRE            (1 << 26)
107 #define INT_CMD12RBE            (1 << 25)
108 #define INT_CMD12CRE            (1 << 24)
109 #define INT_DTRANE              (1 << 23)
110 #define INT_BUFRE               (1 << 22)
111 #define INT_BUFWEN              (1 << 21)
112 #define INT_BUFREN              (1 << 20)
113 #define INT_CCSRCV              (1 << 19)
114 #define INT_RBSYE               (1 << 17)
115 #define INT_CRSPE               (1 << 16)
116 #define INT_CMDVIO              (1 << 15)
117 #define INT_BUFVIO              (1 << 14)
118 #define INT_WDATERR             (1 << 11)
119 #define INT_RDATERR             (1 << 10)
120 #define INT_RIDXERR             (1 << 9)
121 #define INT_RSPERR              (1 << 8)
122 #define INT_CCSTO               (1 << 5)
123 #define INT_CRCSTO              (1 << 4)
124 #define INT_WDATTO              (1 << 3)
125 #define INT_RDATTO              (1 << 2)
126 #define INT_RBSYTO              (1 << 1)
127 #define INT_RSPTO               (1 << 0)
128 #define INT_ERR_STS             (INT_CMDVIO | INT_BUFVIO | INT_WDATERR |  \
129                                  INT_RDATERR | INT_RIDXERR | INT_RSPERR | \
130                                  INT_CCSTO | INT_CRCSTO | INT_WDATTO |    \
131                                  INT_RDATTO | INT_RBSYTO | INT_RSPTO)
132 
133 #define INT_ALL                 (INT_RBSYE | INT_CRSPE | INT_BUFREN |    \
134                                  INT_BUFWEN | INT_CMD12DRE | INT_BUFRE | \
135                                  INT_DTRANE | INT_CMD12RBE | INT_CMD12CRE)
136 
137 #define INT_CCS                 (INT_CCSTO | INT_CCSRCV | INT_CCSDE)
138 
139 /* CE_INT_MASK */
140 #define MASK_ALL                0x00000000
141 #define MASK_MCCSDE             (1 << 29)
142 #define MASK_MCMD12DRE          (1 << 26)
143 #define MASK_MCMD12RBE          (1 << 25)
144 #define MASK_MCMD12CRE          (1 << 24)
145 #define MASK_MDTRANE            (1 << 23)
146 #define MASK_MBUFRE             (1 << 22)
147 #define MASK_MBUFWEN            (1 << 21)
148 #define MASK_MBUFREN            (1 << 20)
149 #define MASK_MCCSRCV            (1 << 19)
150 #define MASK_MRBSYE             (1 << 17)
151 #define MASK_MCRSPE             (1 << 16)
152 #define MASK_MCMDVIO            (1 << 15)
153 #define MASK_MBUFVIO            (1 << 14)
154 #define MASK_MWDATERR           (1 << 11)
155 #define MASK_MRDATERR           (1 << 10)
156 #define MASK_MRIDXERR           (1 << 9)
157 #define MASK_MRSPERR            (1 << 8)
158 #define MASK_MCCSTO             (1 << 5)
159 #define MASK_MCRCSTO            (1 << 4)
160 #define MASK_MWDATTO            (1 << 3)
161 #define MASK_MRDATTO            (1 << 2)
162 #define MASK_MRBSYTO            (1 << 1)
163 #define MASK_MRSPTO             (1 << 0)
164 
165 #define MASK_START_CMD          (MASK_MCMDVIO | MASK_MBUFVIO | MASK_MWDATERR | \
166                                  MASK_MRDATERR | MASK_MRIDXERR | MASK_MRSPERR | \
167                                  MASK_MCRCSTO | MASK_MWDATTO | \
168                                  MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO)
169 
170 #define MASK_CLEAN              (INT_ERR_STS | MASK_MRBSYE | MASK_MCRSPE |      \
171                                  MASK_MBUFREN | MASK_MBUFWEN |                  \
172                                  MASK_MCMD12DRE | MASK_MBUFRE | MASK_MDTRANE |  \
173                                  MASK_MCMD12RBE | MASK_MCMD12CRE)
174 
175 /* CE_HOST_STS1 */
176 #define STS1_CMDSEQ             (1 << 31)
177 
178 /* CE_HOST_STS2 */
179 #define STS2_CRCSTE             (1 << 31)
180 #define STS2_CRC16E             (1 << 30)
181 #define STS2_AC12CRCE           (1 << 29)
182 #define STS2_RSPCRC7E           (1 << 28)
183 #define STS2_CRCSTEBE           (1 << 27)
184 #define STS2_RDATEBE            (1 << 26)
185 #define STS2_AC12REBE           (1 << 25)
186 #define STS2_RSPEBE             (1 << 24)
187 #define STS2_AC12IDXE           (1 << 23)
188 #define STS2_RSPIDXE            (1 << 22)
189 #define STS2_CCSTO              (1 << 15)
190 #define STS2_RDATTO             (1 << 14)
191 #define STS2_DATBSYTO           (1 << 13)
192 #define STS2_CRCSTTO            (1 << 12)
193 #define STS2_AC12BSYTO          (1 << 11)
194 #define STS2_RSPBSYTO           (1 << 10)
195 #define STS2_AC12RSPTO          (1 << 9)
196 #define STS2_RSPTO              (1 << 8)
197 #define STS2_CRC_ERR            (STS2_CRCSTE | STS2_CRC16E |            \
198                                  STS2_AC12CRCE | STS2_RSPCRC7E | STS2_CRCSTEBE)
199 #define STS2_TIMEOUT_ERR        (STS2_CCSTO | STS2_RDATTO |             \
200                                  STS2_DATBSYTO | STS2_CRCSTTO |         \
201                                  STS2_AC12BSYTO | STS2_RSPBSYTO |       \
202                                  STS2_AC12RSPTO | STS2_RSPTO)
203 
204 #define CLKDEV_EMMC_DATA        52000000 /* 52MHz */
205 #define CLKDEV_MMC_DATA         20000000 /* 20MHz */
206 #define CLKDEV_INIT             400000   /* 400 KHz */
207 
208 enum mmcif_state {
209         STATE_IDLE,
210         STATE_REQUEST,
211         STATE_IOS,
212         STATE_TIMEOUT,
213 };
214 
215 enum mmcif_wait_for {
216         MMCIF_WAIT_FOR_REQUEST,
217         MMCIF_WAIT_FOR_CMD,
218         MMCIF_WAIT_FOR_MREAD,
219         MMCIF_WAIT_FOR_MWRITE,
220         MMCIF_WAIT_FOR_READ,
221         MMCIF_WAIT_FOR_WRITE,
222         MMCIF_WAIT_FOR_READ_END,
223         MMCIF_WAIT_FOR_WRITE_END,
224         MMCIF_WAIT_FOR_STOP,
225 };
226 
227 struct sh_mmcif_host {
228         struct mmc_host *mmc;
229         struct mmc_request *mrq;
230         struct platform_device *pd;
231         struct clk *hclk;
232         unsigned int clk;
233         int bus_width;
234         unsigned char timing;
235         bool sd_error;
236         bool dying;
237         long timeout;
238         void __iomem *addr;
239         u32 *pio_ptr;
240         spinlock_t lock;                /* protect sh_mmcif_host::state */
241         enum mmcif_state state;
242         enum mmcif_wait_for wait_for;
243         struct delayed_work timeout_work;
244         size_t blocksize;
245         int sg_idx;
246         int sg_blkidx;
247         bool power;
248         bool card_present;
249         bool ccs_enable;                /* Command Completion Signal support */
250         bool clk_ctrl2_enable;
251         struct mutex thread_lock;
252 
253         /* DMA support */
254         struct dma_chan         *chan_rx;
255         struct dma_chan         *chan_tx;
256         struct completion       dma_complete;
257         bool                    dma_active;
258 };
259 
260 static inline void sh_mmcif_bitset(struct sh_mmcif_host *host,
261                                         unsigned int reg, u32 val)
262 {
263         writel(val | readl(host->addr + reg), host->addr + reg);
264 }
265 
266 static inline void sh_mmcif_bitclr(struct sh_mmcif_host *host,
267                                         unsigned int reg, u32 val)
268 {
269         writel(~val & readl(host->addr + reg), host->addr + reg);
270 }
271 
272 static void mmcif_dma_complete(void *arg)
273 {
274         struct sh_mmcif_host *host = arg;
275         struct mmc_request *mrq = host->mrq;
276 
277         dev_dbg(&host->pd->dev, "Command completed\n");
278 
279         if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion!\n",
280                  dev_name(&host->pd->dev)))
281                 return;
282 
283         complete(&host->dma_complete);
284 }
285 
286 static void sh_mmcif_start_dma_rx(struct sh_mmcif_host *host)
287 {
288         struct mmc_data *data = host->mrq->data;
289         struct scatterlist *sg = data->sg;
290         struct dma_async_tx_descriptor *desc = NULL;
291         struct dma_chan *chan = host->chan_rx;
292         dma_cookie_t cookie = -EINVAL;
293         int ret;
294 
295         ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
296                          DMA_FROM_DEVICE);
297         if (ret > 0) {
298                 host->dma_active = true;
299                 desc = dmaengine_prep_slave_sg(chan, sg, ret,
300                         DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
301         }
302 
303         if (desc) {
304                 desc->callback = mmcif_dma_complete;
305                 desc->callback_param = host;
306                 cookie = dmaengine_submit(desc);
307                 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN);
308                 dma_async_issue_pending(chan);
309         }
310         dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
311                 __func__, data->sg_len, ret, cookie);
312 
313         if (!desc) {
314                 /* DMA failed, fall back to PIO */
315                 if (ret >= 0)
316                         ret = -EIO;
317                 host->chan_rx = NULL;
318                 host->dma_active = false;
319                 dma_release_channel(chan);
320                 /* Free the Tx channel too */
321                 chan = host->chan_tx;
322                 if (chan) {
323                         host->chan_tx = NULL;
324                         dma_release_channel(chan);
325                 }
326                 dev_warn(&host->pd->dev,
327                          "DMA failed: %d, falling back to PIO\n", ret);
328                 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
329         }
330 
331         dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
332                 desc, cookie, data->sg_len);
333 }
334 
335 static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
336 {
337         struct mmc_data *data = host->mrq->data;
338         struct scatterlist *sg = data->sg;
339         struct dma_async_tx_descriptor *desc = NULL;
340         struct dma_chan *chan = host->chan_tx;
341         dma_cookie_t cookie = -EINVAL;
342         int ret;
343 
344         ret = dma_map_sg(chan->device->dev, sg, data->sg_len,
345                          DMA_TO_DEVICE);
346         if (ret > 0) {
347                 host->dma_active = true;
348                 desc = dmaengine_prep_slave_sg(chan, sg, ret,
349                         DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
350         }
351 
352         if (desc) {
353                 desc->callback = mmcif_dma_complete;
354                 desc->callback_param = host;
355                 cookie = dmaengine_submit(desc);
356                 sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAWEN);
357                 dma_async_issue_pending(chan);
358         }
359         dev_dbg(&host->pd->dev, "%s(): mapped %d -> %d, cookie %d\n",
360                 __func__, data->sg_len, ret, cookie);
361 
362         if (!desc) {
363                 /* DMA failed, fall back to PIO */
364                 if (ret >= 0)
365                         ret = -EIO;
366                 host->chan_tx = NULL;
367                 host->dma_active = false;
368                 dma_release_channel(chan);
369                 /* Free the Rx channel too */
370                 chan = host->chan_rx;
371                 if (chan) {
372                         host->chan_rx = NULL;
373                         dma_release_channel(chan);
374                 }
375                 dev_warn(&host->pd->dev,
376                          "DMA failed: %d, falling back to PIO\n", ret);
377                 sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
378         }
379 
380         dev_dbg(&host->pd->dev, "%s(): desc %p, cookie %d\n", __func__,
381                 desc, cookie);
382 }
383 
384 static struct dma_chan *
385 sh_mmcif_request_dma_one(struct sh_mmcif_host *host,
386                          struct sh_mmcif_plat_data *pdata,
387                          enum dma_transfer_direction direction)
388 {
389         struct dma_slave_config cfg;
390         struct dma_chan *chan;
391         unsigned int slave_id;
392         struct resource *res;
393         dma_cap_mask_t mask;
394         int ret;
395 
396         dma_cap_zero(mask);
397         dma_cap_set(DMA_SLAVE, mask);
398 
399         if (pdata)
400                 slave_id = direction == DMA_MEM_TO_DEV
401                          ? pdata->slave_id_tx : pdata->slave_id_rx;
402         else
403                 slave_id = 0;
404 
405         chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
406                                 (void *)(unsigned long)slave_id, &host->pd->dev,
407                                 direction == DMA_MEM_TO_DEV ? "tx" : "rx");
408 
409         dev_dbg(&host->pd->dev, "%s: %s: got channel %p\n", __func__,
410                 direction == DMA_MEM_TO_DEV ? "TX" : "RX", chan);
411 
412         if (!chan)
413                 return NULL;
414 
415         res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
416 
417         /* In the OF case the driver will get the slave ID from the DT */
418         cfg.slave_id = slave_id;
419         cfg.direction = direction;
420         cfg.dst_addr = res->start + MMCIF_CE_DATA;
421         cfg.src_addr = 0;
422         ret = dmaengine_slave_config(chan, &cfg);
423         if (ret < 0) {
424                 dma_release_channel(chan);
425                 return NULL;
426         }
427 
428         return chan;
429 }
430 
431 static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
432                                  struct sh_mmcif_plat_data *pdata)
433 {
434         host->dma_active = false;
435 
436         if (pdata) {
437                 if (pdata->slave_id_tx <= 0 || pdata->slave_id_rx <= 0)
438                         return;
439         } else if (!host->pd->dev.of_node) {
440                 return;
441         }
442 
443         /* We can only either use DMA for both Tx and Rx or not use it at all */
444         host->chan_tx = sh_mmcif_request_dma_one(host, pdata, DMA_MEM_TO_DEV);
445         if (!host->chan_tx)
446                 return;
447 
448         host->chan_rx = sh_mmcif_request_dma_one(host, pdata, DMA_DEV_TO_MEM);
449         if (!host->chan_rx) {
450                 dma_release_channel(host->chan_tx);
451                 host->chan_tx = NULL;
452         }
453 }
454 
455 static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
456 {
457         sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC, BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
458         /* Descriptors are freed automatically */
459         if (host->chan_tx) {
460                 struct dma_chan *chan = host->chan_tx;
461                 host->chan_tx = NULL;
462                 dma_release_channel(chan);
463         }
464         if (host->chan_rx) {
465                 struct dma_chan *chan = host->chan_rx;
466                 host->chan_rx = NULL;
467                 dma_release_channel(chan);
468         }
469 
470         host->dma_active = false;
471 }
472 
473 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
474 {
475         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
476         bool sup_pclk = p ? p->sup_pclk : false;
477 
478         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
479         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
480 
481         if (!clk)
482                 return;
483         if (sup_pclk && clk == host->clk)
484                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
485         else
486                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
487                                 ((fls(DIV_ROUND_UP(host->clk,
488                                                    clk) - 1) - 1) << 16));
489 
490         sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
491 }
492 
493 static void sh_mmcif_sync_reset(struct sh_mmcif_host *host)
494 {
495         u32 tmp;
496 
497         tmp = 0x010f0000 & sh_mmcif_readl(host->addr, MMCIF_CE_CLK_CTRL);
498 
499         sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_ON);
500         sh_mmcif_writel(host->addr, MMCIF_CE_VERSION, SOFT_RST_OFF);
501         if (host->ccs_enable)
502                 tmp |= SCCSTO_29;
503         if (host->clk_ctrl2_enable)
504                 sh_mmcif_writel(host->addr, MMCIF_CE_CLK_CTRL2, 0x0F0F0000);
505         sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, tmp |
506                 SRSPTO_256 | SRBSYTO_29 | SRWDTO_29);
507         /* byte swap on */
508         sh_mmcif_bitset(host, MMCIF_CE_BUF_ACC, BUF_ACC_ATYP);
509 }
510 
511 static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
512 {
513         u32 state1, state2;
514         int ret, timeout;
515 
516         host->sd_error = false;
517 
518         state1 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1);
519         state2 = sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS2);
520         dev_dbg(&host->pd->dev, "ERR HOST_STS1 = %08x\n", state1);
521         dev_dbg(&host->pd->dev, "ERR HOST_STS2 = %08x\n", state2);
522 
523         if (state1 & STS1_CMDSEQ) {
524                 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, CMD_CTRL_BREAK);
525                 sh_mmcif_bitset(host, MMCIF_CE_CMD_CTRL, ~CMD_CTRL_BREAK);
526                 for (timeout = 10000000; timeout; timeout--) {
527                         if (!(sh_mmcif_readl(host->addr, MMCIF_CE_HOST_STS1)
528                               & STS1_CMDSEQ))
529                                 break;
530                         mdelay(1);
531                 }
532                 if (!timeout) {
533                         dev_err(&host->pd->dev,
534                                 "Forced end of command sequence timeout err\n");
535                         return -EIO;
536                 }
537                 sh_mmcif_sync_reset(host);
538                 dev_dbg(&host->pd->dev, "Forced end of command sequence\n");
539                 return -EIO;
540         }
541 
542         if (state2 & STS2_CRC_ERR) {
543                 dev_err(&host->pd->dev, " CRC error: state %u, wait %u\n",
544                         host->state, host->wait_for);
545                 ret = -EIO;
546         } else if (state2 & STS2_TIMEOUT_ERR) {
547                 dev_err(&host->pd->dev, " Timeout: state %u, wait %u\n",
548                         host->state, host->wait_for);
549                 ret = -ETIMEDOUT;
550         } else {
551                 dev_dbg(&host->pd->dev, " End/Index error: state %u, wait %u\n",
552                         host->state, host->wait_for);
553                 ret = -EIO;
554         }
555         return ret;
556 }
557 
558 static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
559 {
560         struct mmc_data *data = host->mrq->data;
561 
562         host->sg_blkidx += host->blocksize;
563 
564         /* data->sg->length must be a multiple of host->blocksize? */
565         BUG_ON(host->sg_blkidx > data->sg->length);
566 
567         if (host->sg_blkidx == data->sg->length) {
568                 host->sg_blkidx = 0;
569                 if (++host->sg_idx < data->sg_len)
570                         host->pio_ptr = sg_virt(++data->sg);
571         } else {
572                 host->pio_ptr = p;
573         }
574 
575         return host->sg_idx != data->sg_len;
576 }
577 
578 static void sh_mmcif_single_read(struct sh_mmcif_host *host,
579                                  struct mmc_request *mrq)
580 {
581         host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
582                            BLOCK_SIZE_MASK) + 3;
583 
584         host->wait_for = MMCIF_WAIT_FOR_READ;
585 
586         /* buf read enable */
587         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
588 }
589 
590 static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
591 {
592         struct mmc_data *data = host->mrq->data;
593         u32 *p = sg_virt(data->sg);
594         int i;
595 
596         if (host->sd_error) {
597                 data->error = sh_mmcif_error_manage(host);
598                 dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, data->error);
599                 return false;
600         }
601 
602         for (i = 0; i < host->blocksize / 4; i++)
603                 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
604 
605         /* buffer read end */
606         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
607         host->wait_for = MMCIF_WAIT_FOR_READ_END;
608 
609         return true;
610 }
611 
612 static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
613                                 struct mmc_request *mrq)
614 {
615         struct mmc_data *data = mrq->data;
616 
617         if (!data->sg_len || !data->sg->length)
618                 return;
619 
620         host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
621                 BLOCK_SIZE_MASK;
622 
623         host->wait_for = MMCIF_WAIT_FOR_MREAD;
624         host->sg_idx = 0;
625         host->sg_blkidx = 0;
626         host->pio_ptr = sg_virt(data->sg);
627 
628         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
629 }
630 
631 static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
632 {
633         struct mmc_data *data = host->mrq->data;
634         u32 *p = host->pio_ptr;
635         int i;
636 
637         if (host->sd_error) {
638                 data->error = sh_mmcif_error_manage(host);
639                 dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, data->error);
640                 return false;
641         }
642 
643         BUG_ON(!data->sg->length);
644 
645         for (i = 0; i < host->blocksize / 4; i++)
646                 *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
647 
648         if (!sh_mmcif_next_block(host, p))
649                 return false;
650 
651         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
652 
653         return true;
654 }
655 
656 static void sh_mmcif_single_write(struct sh_mmcif_host *host,
657                                         struct mmc_request *mrq)
658 {
659         host->blocksize = (sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
660                            BLOCK_SIZE_MASK) + 3;
661 
662         host->wait_for = MMCIF_WAIT_FOR_WRITE;
663 
664         /* buf write enable */
665         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
666 }
667 
668 static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
669 {
670         struct mmc_data *data = host->mrq->data;
671         u32 *p = sg_virt(data->sg);
672         int i;
673 
674         if (host->sd_error) {
675                 data->error = sh_mmcif_error_manage(host);
676                 dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, data->error);
677                 return false;
678         }
679 
680         for (i = 0; i < host->blocksize / 4; i++)
681                 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
682 
683         /* buffer write end */
684         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
685         host->wait_for = MMCIF_WAIT_FOR_WRITE_END;
686 
687         return true;
688 }
689 
690 static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
691                                 struct mmc_request *mrq)
692 {
693         struct mmc_data *data = mrq->data;
694 
695         if (!data->sg_len || !data->sg->length)
696                 return;
697 
698         host->blocksize = sh_mmcif_readl(host->addr, MMCIF_CE_BLOCK_SET) &
699                 BLOCK_SIZE_MASK;
700 
701         host->wait_for = MMCIF_WAIT_FOR_MWRITE;
702         host->sg_idx = 0;
703         host->sg_blkidx = 0;
704         host->pio_ptr = sg_virt(data->sg);
705 
706         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
707 }
708 
709 static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
710 {
711         struct mmc_data *data = host->mrq->data;
712         u32 *p = host->pio_ptr;
713         int i;
714 
715         if (host->sd_error) {
716                 data->error = sh_mmcif_error_manage(host);
717                 dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, data->error);
718                 return false;
719         }
720 
721         BUG_ON(!data->sg->length);
722 
723         for (i = 0; i < host->blocksize / 4; i++)
724                 sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
725 
726         if (!sh_mmcif_next_block(host, p))
727                 return false;
728 
729         sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
730 
731         return true;
732 }
733 
734 static void sh_mmcif_get_response(struct sh_mmcif_host *host,
735                                                 struct mmc_command *cmd)
736 {
737         if (cmd->flags & MMC_RSP_136) {
738                 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP3);
739                 cmd->resp[1] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP2);
740                 cmd->resp[2] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP1);
741                 cmd->resp[3] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
742         } else
743                 cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP0);
744 }
745 
746 static void sh_mmcif_get_cmd12response(struct sh_mmcif_host *host,
747                                                 struct mmc_command *cmd)
748 {
749         cmd->resp[0] = sh_mmcif_readl(host->addr, MMCIF_CE_RESP_CMD12);
750 }
751 
752 static u32 sh_mmcif_set_cmd(struct sh_mmcif_host *host,
753                             struct mmc_request *mrq)
754 {
755         struct mmc_data *data = mrq->data;
756         struct mmc_command *cmd = mrq->cmd;
757         u32 opc = cmd->opcode;
758         u32 tmp = 0;
759 
760         /* Response Type check */
761         switch (mmc_resp_type(cmd)) {
762         case MMC_RSP_NONE:
763                 tmp |= CMD_SET_RTYP_NO;
764                 break;
765         case MMC_RSP_R1:
766         case MMC_RSP_R1B:
767         case MMC_RSP_R3:
768                 tmp |= CMD_SET_RTYP_6B;
769                 break;
770         case MMC_RSP_R2:
771                 tmp |= CMD_SET_RTYP_17B;
772                 break;
773         default:
774                 dev_err(&host->pd->dev, "Unsupported response type.\n");
775                 break;
776         }
777         switch (opc) {
778         /* RBSY */
779         case MMC_SLEEP_AWAKE:
780         case MMC_SWITCH:
781         case MMC_STOP_TRANSMISSION:
782         case MMC_SET_WRITE_PROT:
783         case MMC_CLR_WRITE_PROT:
784         case MMC_ERASE:
785                 tmp |= CMD_SET_RBSY;
786                 break;
787         }
788         /* WDAT / DATW */
789         if (data) {
790                 tmp |= CMD_SET_WDAT;
791                 switch (host->bus_width) {
792                 case MMC_BUS_WIDTH_1:
793                         tmp |= CMD_SET_DATW_1;
794                         break;
795                 case MMC_BUS_WIDTH_4:
796                         tmp |= CMD_SET_DATW_4;
797                         break;
798                 case MMC_BUS_WIDTH_8:
799                         tmp |= CMD_SET_DATW_8;
800                         break;
801                 default:
802                         dev_err(&host->pd->dev, "Unsupported bus width.\n");
803                         break;
804                 }
805                 switch (host->timing) {
806                 case MMC_TIMING_MMC_DDR52:
807                         /*
808                          * MMC core will only set this timing, if the host
809                          * advertises the MMC_CAP_1_8V_DDR/MMC_CAP_1_2V_DDR
810                          * capability. MMCIF implementations with this
811                          * capability, e.g. sh73a0, will have to set it
812                          * in their platform data.
813                          */
814                         tmp |= CMD_SET_DARS;
815                         break;
816                 }
817         }
818         /* DWEN */
819         if (opc == MMC_WRITE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK)
820                 tmp |= CMD_SET_DWEN;
821         /* CMLTE/CMD12EN */
822         if (opc == MMC_READ_MULTIPLE_BLOCK || opc == MMC_WRITE_MULTIPLE_BLOCK) {
823                 tmp |= CMD_SET_CMLTE | CMD_SET_CMD12EN;
824                 sh_mmcif_bitset(host, MMCIF_CE_BLOCK_SET,
825                                 data->blocks << 16);
826         }
827         /* RIDXC[1:0] check bits */
828         if (opc == MMC_SEND_OP_COND || opc == MMC_ALL_SEND_CID ||
829             opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
830                 tmp |= CMD_SET_RIDXC_BITS;
831         /* RCRC7C[1:0] check bits */
832         if (opc == MMC_SEND_OP_COND)
833                 tmp |= CMD_SET_CRC7C_BITS;
834         /* RCRC7C[1:0] internal CRC7 */
835         if (opc == MMC_ALL_SEND_CID ||
836                 opc == MMC_SEND_CSD || opc == MMC_SEND_CID)
837                 tmp |= CMD_SET_CRC7C_INTERNAL;
838 
839         return (opc << 24) | tmp;
840 }
841 
842 static int sh_mmcif_data_trans(struct sh_mmcif_host *host,
843                                struct mmc_request *mrq, u32 opc)
844 {
845         switch (opc) {
846         case MMC_READ_MULTIPLE_BLOCK:
847                 sh_mmcif_multi_read(host, mrq);
848                 return 0;
849         case MMC_WRITE_MULTIPLE_BLOCK:
850                 sh_mmcif_multi_write(host, mrq);
851                 return 0;
852         case MMC_WRITE_BLOCK:
853                 sh_mmcif_single_write(host, mrq);
854                 return 0;
855         case MMC_READ_SINGLE_BLOCK:
856         case MMC_SEND_EXT_CSD:
857                 sh_mmcif_single_read(host, mrq);
858                 return 0;
859         default:
860                 dev_err(&host->pd->dev, "Unsupported CMD%d\n", opc);
861                 return -EINVAL;
862         }
863 }
864 
865 static void sh_mmcif_start_cmd(struct sh_mmcif_host *host,
866                                struct mmc_request *mrq)
867 {
868         struct mmc_command *cmd = mrq->cmd;
869         u32 opc = cmd->opcode;
870         u32 mask;
871 
872         switch (opc) {
873         /* response busy check */
874         case MMC_SLEEP_AWAKE:
875         case MMC_SWITCH:
876         case MMC_STOP_TRANSMISSION:
877         case MMC_SET_WRITE_PROT:
878         case MMC_CLR_WRITE_PROT:
879         case MMC_ERASE:
880                 mask = MASK_START_CMD | MASK_MRBSYE;
881                 break;
882         default:
883                 mask = MASK_START_CMD | MASK_MCRSPE;
884                 break;
885         }
886 
887         if (host->ccs_enable)
888                 mask |= MASK_MCCSTO;
889 
890         if (mrq->data) {
891                 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET, 0);
892                 sh_mmcif_writel(host->addr, MMCIF_CE_BLOCK_SET,
893                                 mrq->data->blksz);
894         }
895         opc = sh_mmcif_set_cmd(host, mrq);
896 
897         if (host->ccs_enable)
898                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0);
899         else
900                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, 0xD80430C0 | INT_CCS);
901         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, mask);
902         /* set arg */
903         sh_mmcif_writel(host->addr, MMCIF_CE_ARG, cmd->arg);
904         /* set cmd */
905         sh_mmcif_writel(host->addr, MMCIF_CE_CMD_SET, opc);
906 
907         host->wait_for = MMCIF_WAIT_FOR_CMD;
908         schedule_delayed_work(&host->timeout_work, host->timeout);
909 }
910 
911 static void sh_mmcif_stop_cmd(struct sh_mmcif_host *host,
912                               struct mmc_request *mrq)
913 {
914         switch (mrq->cmd->opcode) {
915         case MMC_READ_MULTIPLE_BLOCK:
916                 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
917                 break;
918         case MMC_WRITE_MULTIPLE_BLOCK:
919                 sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
920                 break;
921         default:
922                 dev_err(&host->pd->dev, "unsupported stop cmd\n");
923                 mrq->stop->error = sh_mmcif_error_manage(host);
924                 return;
925         }
926 
927         host->wait_for = MMCIF_WAIT_FOR_STOP;
928 }
929 
930 static void sh_mmcif_request(struct mmc_host *mmc, struct mmc_request *mrq)
931 {
932         struct sh_mmcif_host *host = mmc_priv(mmc);
933         unsigned long flags;
934 
935         spin_lock_irqsave(&host->lock, flags);
936         if (host->state != STATE_IDLE) {
937                 dev_dbg(&host->pd->dev, "%s() rejected, state %u\n", __func__, host->state);
938                 spin_unlock_irqrestore(&host->lock, flags);
939                 mrq->cmd->error = -EAGAIN;
940                 mmc_request_done(mmc, mrq);
941                 return;
942         }
943 
944         host->state = STATE_REQUEST;
945         spin_unlock_irqrestore(&host->lock, flags);
946 
947         switch (mrq->cmd->opcode) {
948         /* MMCIF does not support SD/SDIO command */
949         case MMC_SLEEP_AWAKE: /* = SD_IO_SEND_OP_COND (5) */
950         case MMC_SEND_EXT_CSD: /* = SD_SEND_IF_COND (8) */
951                 if ((mrq->cmd->flags & MMC_CMD_MASK) != MMC_CMD_BCR)
952                         break;
953         case MMC_APP_CMD:
954         case SD_IO_RW_DIRECT:
955                 host->state = STATE_IDLE;
956                 mrq->cmd->error = -ETIMEDOUT;
957                 mmc_request_done(mmc, mrq);
958                 return;
959         default:
960                 break;
961         }
962 
963         host->mrq = mrq;
964 
965         sh_mmcif_start_cmd(host, mrq);
966 }
967 
968 static int sh_mmcif_clk_update(struct sh_mmcif_host *host)
969 {
970         int ret = clk_prepare_enable(host->hclk);
971 
972         if (!ret) {
973                 host->clk = clk_get_rate(host->hclk);
974                 host->mmc->f_max = host->clk / 2;
975                 host->mmc->f_min = host->clk / 512;
976         }
977 
978         return ret;
979 }
980 
981 static void sh_mmcif_set_power(struct sh_mmcif_host *host, struct mmc_ios *ios)
982 {
983         struct mmc_host *mmc = host->mmc;
984 
985         if (!IS_ERR(mmc->supply.vmmc))
986                 /* Errors ignored... */
987                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
988                                       ios->power_mode ? ios->vdd : 0);
989 }
990 
991 static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
992 {
993         struct sh_mmcif_host *host = mmc_priv(mmc);
994         unsigned long flags;
995 
996         spin_lock_irqsave(&host->lock, flags);
997         if (host->state != STATE_IDLE) {
998                 dev_dbg(&host->pd->dev, "%s() rejected, state %u\n", __func__, host->state);
999                 spin_unlock_irqrestore(&host->lock, flags);
1000                 return;
1001         }
1002 
1003         host->state = STATE_IOS;
1004         spin_unlock_irqrestore(&host->lock, flags);
1005 
1006         if (ios->power_mode == MMC_POWER_UP) {
1007                 if (!host->card_present) {
1008                         /* See if we also get DMA */
1009                         sh_mmcif_request_dma(host, host->pd->dev.platform_data);
1010                         host->card_present = true;
1011                 }
1012                 sh_mmcif_set_power(host, ios);
1013         } else if (ios->power_mode == MMC_POWER_OFF || !ios->clock) {
1014                 /* clock stop */
1015                 sh_mmcif_clock_control(host, 0);
1016                 if (ios->power_mode == MMC_POWER_OFF) {
1017                         if (host->card_present) {
1018                                 sh_mmcif_release_dma(host);
1019                                 host->card_present = false;
1020                         }
1021                 }
1022                 if (host->power) {
1023                         pm_runtime_put_sync(&host->pd->dev);
1024                         clk_disable_unprepare(host->hclk);
1025                         host->power = false;
1026                         if (ios->power_mode == MMC_POWER_OFF)
1027                                 sh_mmcif_set_power(host, ios);
1028                 }
1029                 host->state = STATE_IDLE;
1030                 return;
1031         }
1032 
1033         if (ios->clock) {
1034                 if (!host->power) {
1035                         sh_mmcif_clk_update(host);
1036                         pm_runtime_get_sync(&host->pd->dev);
1037                         host->power = true;
1038                         sh_mmcif_sync_reset(host);
1039                 }
1040                 sh_mmcif_clock_control(host, ios->clock);
1041         }
1042 
1043         host->timing = ios->timing;
1044         host->bus_width = ios->bus_width;
1045         host->state = STATE_IDLE;
1046 }
1047 
1048 static int sh_mmcif_get_cd(struct mmc_host *mmc)
1049 {
1050         struct sh_mmcif_host *host = mmc_priv(mmc);
1051         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
1052         int ret = mmc_gpio_get_cd(mmc);
1053 
1054         if (ret >= 0)
1055                 return ret;
1056 
1057         if (!p || !p->get_cd)
1058                 return -ENOSYS;
1059         else
1060                 return p->get_cd(host->pd);
1061 }
1062 
1063 static struct mmc_host_ops sh_mmcif_ops = {
1064         .request        = sh_mmcif_request,
1065         .set_ios        = sh_mmcif_set_ios,
1066         .get_cd         = sh_mmcif_get_cd,
1067 };
1068 
1069 static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
1070 {
1071         struct mmc_command *cmd = host->mrq->cmd;
1072         struct mmc_data *data = host->mrq->data;
1073         long time;
1074 
1075         if (host->sd_error) {
1076                 switch (cmd->opcode) {
1077                 case MMC_ALL_SEND_CID:
1078                 case MMC_SELECT_CARD:
1079                 case MMC_APP_CMD:
1080                         cmd->error = -ETIMEDOUT;
1081                         break;
1082                 default:
1083                         cmd->error = sh_mmcif_error_manage(host);
1084                         break;
1085                 }
1086                 dev_dbg(&host->pd->dev, "CMD%d error %d\n",
1087                         cmd->opcode, cmd->error);
1088                 host->sd_error = false;
1089                 return false;
1090         }
1091         if (!(cmd->flags & MMC_RSP_PRESENT)) {
1092                 cmd->error = 0;
1093                 return false;
1094         }
1095 
1096         sh_mmcif_get_response(host, cmd);
1097 
1098         if (!data)
1099                 return false;
1100 
1101         /*
1102          * Completion can be signalled from DMA callback and error, so, have to
1103          * reset here, before setting .dma_active
1104          */
1105         init_completion(&host->dma_complete);
1106 
1107         if (data->flags & MMC_DATA_READ) {
1108                 if (host->chan_rx)
1109                         sh_mmcif_start_dma_rx(host);
1110         } else {
1111                 if (host->chan_tx)
1112                         sh_mmcif_start_dma_tx(host);
1113         }
1114 
1115         if (!host->dma_active) {
1116                 data->error = sh_mmcif_data_trans(host, host->mrq, cmd->opcode);
1117                 return !data->error;
1118         }
1119 
1120         /* Running in the IRQ thread, can sleep */
1121         time = wait_for_completion_interruptible_timeout(&host->dma_complete,
1122                                                          host->timeout);
1123 
1124         if (data->flags & MMC_DATA_READ)
1125                 dma_unmap_sg(host->chan_rx->device->dev,
1126                              data->sg, data->sg_len,
1127                              DMA_FROM_DEVICE);
1128         else
1129                 dma_unmap_sg(host->chan_tx->device->dev,
1130                              data->sg, data->sg_len,
1131                              DMA_TO_DEVICE);
1132 
1133         if (host->sd_error) {
1134                 dev_err(host->mmc->parent,
1135                         "Error IRQ while waiting for DMA completion!\n");
1136                 /* Woken up by an error IRQ: abort DMA */
1137                 data->error = sh_mmcif_error_manage(host);
1138         } else if (!time) {
1139                 dev_err(host->mmc->parent, "DMA timeout!\n");
1140                 data->error = -ETIMEDOUT;
1141         } else if (time < 0) {
1142                 dev_err(host->mmc->parent,
1143                         "wait_for_completion_...() error %ld!\n", time);
1144                 data->error = time;
1145         }
1146         sh_mmcif_bitclr(host, MMCIF_CE_BUF_ACC,
1147                         BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
1148         host->dma_active = false;
1149 
1150         if (data->error) {
1151                 data->bytes_xfered = 0;
1152                 /* Abort DMA */
1153                 if (data->flags & MMC_DATA_READ)
1154                         dmaengine_terminate_all(host->chan_rx);
1155                 else
1156                         dmaengine_terminate_all(host->chan_tx);
1157         }
1158 
1159         return false;
1160 }
1161 
1162 static irqreturn_t sh_mmcif_irqt(int irq, void *dev_id)
1163 {
1164         struct sh_mmcif_host *host = dev_id;
1165         struct mmc_request *mrq;
1166         bool wait = false;
1167 
1168         cancel_delayed_work_sync(&host->timeout_work);
1169 
1170         mutex_lock(&host->thread_lock);
1171 
1172         mrq = host->mrq;
1173         if (!mrq) {
1174                 dev_dbg(&host->pd->dev, "IRQ thread state %u, wait %u: NULL mrq!\n",
1175                         host->state, host->wait_for);
1176                 mutex_unlock(&host->thread_lock);
1177                 return IRQ_HANDLED;
1178         }
1179 
1180         /*
1181          * All handlers return true, if processing continues, and false, if the
1182          * request has to be completed - successfully or not
1183          */
1184         switch (host->wait_for) {
1185         case MMCIF_WAIT_FOR_REQUEST:
1186                 /* We're too late, the timeout has already kicked in */
1187                 mutex_unlock(&host->thread_lock);
1188                 return IRQ_HANDLED;
1189         case MMCIF_WAIT_FOR_CMD:
1190                 /* Wait for data? */
1191                 wait = sh_mmcif_end_cmd(host);
1192                 break;
1193         case MMCIF_WAIT_FOR_MREAD:
1194                 /* Wait for more data? */
1195                 wait = sh_mmcif_mread_block(host);
1196                 break;
1197         case MMCIF_WAIT_FOR_READ:
1198                 /* Wait for data end? */
1199                 wait = sh_mmcif_read_block(host);
1200                 break;
1201         case MMCIF_WAIT_FOR_MWRITE:
1202                 /* Wait data to write? */
1203                 wait = sh_mmcif_mwrite_block(host);
1204                 break;
1205         case MMCIF_WAIT_FOR_WRITE:
1206                 /* Wait for data end? */
1207                 wait = sh_mmcif_write_block(host);
1208                 break;
1209         case MMCIF_WAIT_FOR_STOP:
1210                 if (host->sd_error) {
1211                         mrq->stop->error = sh_mmcif_error_manage(host);
1212                         dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, mrq->stop->error);
1213                         break;
1214                 }
1215                 sh_mmcif_get_cmd12response(host, mrq->stop);
1216                 mrq->stop->error = 0;
1217                 break;
1218         case MMCIF_WAIT_FOR_READ_END:
1219         case MMCIF_WAIT_FOR_WRITE_END:
1220                 if (host->sd_error) {
1221                         mrq->data->error = sh_mmcif_error_manage(host);
1222                         dev_dbg(&host->pd->dev, "%s(): %d\n", __func__, mrq->data->error);
1223                 }
1224                 break;
1225         default:
1226                 BUG();
1227         }
1228 
1229         if (wait) {
1230                 schedule_delayed_work(&host->timeout_work, host->timeout);
1231                 /* Wait for more data */
1232                 mutex_unlock(&host->thread_lock);
1233                 return IRQ_HANDLED;
1234         }
1235 
1236         if (host->wait_for != MMCIF_WAIT_FOR_STOP) {
1237                 struct mmc_data *data = mrq->data;
1238                 if (!mrq->cmd->error && data && !data->error)
1239                         data->bytes_xfered =
1240                                 data->blocks * data->blksz;
1241 
1242                 if (mrq->stop && !mrq->cmd->error && (!data || !data->error)) {
1243                         sh_mmcif_stop_cmd(host, mrq);
1244                         if (!mrq->stop->error) {
1245                                 schedule_delayed_work(&host->timeout_work, host->timeout);
1246                                 mutex_unlock(&host->thread_lock);
1247                                 return IRQ_HANDLED;
1248                         }
1249                 }
1250         }
1251 
1252         host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1253         host->state = STATE_IDLE;
1254         host->mrq = NULL;
1255         mmc_request_done(host->mmc, mrq);
1256 
1257         mutex_unlock(&host->thread_lock);
1258 
1259         return IRQ_HANDLED;
1260 }
1261 
1262 static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
1263 {
1264         struct sh_mmcif_host *host = dev_id;
1265         u32 state, mask;
1266 
1267         state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
1268         mask = sh_mmcif_readl(host->addr, MMCIF_CE_INT_MASK);
1269         if (host->ccs_enable)
1270                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~(state & mask));
1271         else
1272                 sh_mmcif_writel(host->addr, MMCIF_CE_INT, INT_CCS | ~(state & mask));
1273         sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state & MASK_CLEAN);
1274 
1275         if (state & ~MASK_CLEAN)
1276                 dev_dbg(&host->pd->dev, "IRQ state = 0x%08x incompletely cleared\n",
1277                         state);
1278 
1279         if (state & INT_ERR_STS || state & ~INT_ALL) {
1280                 host->sd_error = true;
1281                 dev_dbg(&host->pd->dev, "int err state = 0x%08x\n", state);
1282         }
1283         if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
1284                 if (!host->mrq)
1285                         dev_dbg(&host->pd->dev, "NULL IRQ state = 0x%08x\n", state);
1286                 if (!host->dma_active)
1287                         return IRQ_WAKE_THREAD;
1288                 else if (host->sd_error)
1289                         mmcif_dma_complete(host);
1290         } else {
1291                 dev_dbg(&host->pd->dev, "Unexpected IRQ 0x%x\n", state);
1292         }
1293 
1294         return IRQ_HANDLED;
1295 }
1296 
1297 static void mmcif_timeout_work(struct work_struct *work)
1298 {
1299         struct delayed_work *d = container_of(work, struct delayed_work, work);
1300         struct sh_mmcif_host *host = container_of(d, struct sh_mmcif_host, timeout_work);
1301         struct mmc_request *mrq = host->mrq;
1302         unsigned long flags;
1303 
1304         if (host->dying)
1305                 /* Don't run after mmc_remove_host() */
1306                 return;
1307 
1308         dev_err(&host->pd->dev, "Timeout waiting for %u on CMD%u\n",
1309                 host->wait_for, mrq->cmd->opcode);
1310 
1311         spin_lock_irqsave(&host->lock, flags);
1312         if (host->state == STATE_IDLE) {
1313                 spin_unlock_irqrestore(&host->lock, flags);
1314                 return;
1315         }
1316 
1317         host->state = STATE_TIMEOUT;
1318         spin_unlock_irqrestore(&host->lock, flags);
1319 
1320         /*
1321          * Handle races with cancel_delayed_work(), unless
1322          * cancel_delayed_work_sync() is used
1323          */
1324         switch (host->wait_for) {
1325         case MMCIF_WAIT_FOR_CMD:
1326                 mrq->cmd->error = sh_mmcif_error_manage(host);
1327                 break;
1328         case MMCIF_WAIT_FOR_STOP:
1329                 mrq->stop->error = sh_mmcif_error_manage(host);
1330                 break;
1331         case MMCIF_WAIT_FOR_MREAD:
1332         case MMCIF_WAIT_FOR_MWRITE:
1333         case MMCIF_WAIT_FOR_READ:
1334         case MMCIF_WAIT_FOR_WRITE:
1335         case MMCIF_WAIT_FOR_READ_END:
1336         case MMCIF_WAIT_FOR_WRITE_END:
1337                 mrq->data->error = sh_mmcif_error_manage(host);
1338                 break;
1339         default:
1340                 BUG();
1341         }
1342 
1343         host->state = STATE_IDLE;
1344         host->wait_for = MMCIF_WAIT_FOR_REQUEST;
1345         host->mrq = NULL;
1346         mmc_request_done(host->mmc, mrq);
1347 }
1348 
1349 static void sh_mmcif_init_ocr(struct sh_mmcif_host *host)
1350 {
1351         struct sh_mmcif_plat_data *pd = host->pd->dev.platform_data;
1352         struct mmc_host *mmc = host->mmc;
1353 
1354         mmc_regulator_get_supply(mmc);
1355 
1356         if (!pd)
1357                 return;
1358 
1359         if (!mmc->ocr_avail)
1360                 mmc->ocr_avail = pd->ocr;
1361         else if (pd->ocr)
1362                 dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
1363 }
1364 
1365 static int sh_mmcif_probe(struct platform_device *pdev)
1366 {
1367         int ret = 0, irq[2];
1368         struct mmc_host *mmc;
1369         struct sh_mmcif_host *host;
1370         struct sh_mmcif_plat_data *pd = pdev->dev.platform_data;
1371         struct resource *res;
1372         void __iomem *reg;
1373         const char *name;
1374 
1375         irq[0] = platform_get_irq(pdev, 0);
1376         irq[1] = platform_get_irq(pdev, 1);
1377         if (irq[0] < 0) {
1378                 dev_err(&pdev->dev, "Get irq error\n");
1379                 return -ENXIO;
1380         }
1381         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1382         if (!res) {
1383                 dev_err(&pdev->dev, "platform_get_resource error.\n");
1384                 return -ENXIO;
1385         }
1386         reg = ioremap(res->start, resource_size(res));
1387         if (!reg) {
1388                 dev_err(&pdev->dev, "ioremap error.\n");
1389                 return -ENOMEM;
1390         }
1391 
1392         mmc = mmc_alloc_host(sizeof(struct sh_mmcif_host), &pdev->dev);
1393         if (!mmc) {
1394                 ret = -ENOMEM;
1395                 goto ealloch;
1396         }
1397 
1398         ret = mmc_of_parse(mmc);
1399         if (ret < 0)
1400                 goto eofparse;
1401 
1402         host            = mmc_priv(mmc);
1403         host->mmc       = mmc;
1404         host->addr      = reg;
1405         host->timeout   = msecs_to_jiffies(1000);
1406         host->ccs_enable = !pd || !pd->ccs_unsupported;
1407         host->clk_ctrl2_enable = pd && pd->clk_ctrl2_present;
1408 
1409         host->pd = pdev;
1410 
1411         spin_lock_init(&host->lock);
1412 
1413         mmc->ops = &sh_mmcif_ops;
1414         sh_mmcif_init_ocr(host);
1415 
1416         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_WAIT_WHILE_BUSY;
1417         if (pd && pd->caps)
1418                 mmc->caps |= pd->caps;
1419         mmc->max_segs = 32;
1420         mmc->max_blk_size = 512;
1421         mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs;
1422         mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
1423         mmc->max_seg_size = mmc->max_req_size;
1424 
1425         platform_set_drvdata(pdev, host);
1426 
1427         pm_runtime_enable(&pdev->dev);
1428         host->power = false;
1429 
1430         host->hclk = clk_get(&pdev->dev, NULL);
1431         if (IS_ERR(host->hclk)) {
1432                 ret = PTR_ERR(host->hclk);
1433                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
1434                 goto eclkget;
1435         }
1436         ret = sh_mmcif_clk_update(host);
1437         if (ret < 0)
1438                 goto eclkupdate;
1439 
1440         ret = pm_runtime_resume(&pdev->dev);
1441         if (ret < 0)
1442                 goto eresume;
1443 
1444         INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
1445 
1446         sh_mmcif_sync_reset(host);
1447         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1448 
1449         name = irq[1] < 0 ? dev_name(&pdev->dev) : "sh_mmc:error";
1450         ret = request_threaded_irq(irq[0], sh_mmcif_intr, sh_mmcif_irqt, 0, name, host);
1451         if (ret) {
1452                 dev_err(&pdev->dev, "request_irq error (%s)\n", name);
1453                 goto ereqirq0;
1454         }
1455         if (irq[1] >= 0) {
1456                 ret = request_threaded_irq(irq[1], sh_mmcif_intr, sh_mmcif_irqt,
1457                                            0, "sh_mmc:int", host);
1458                 if (ret) {
1459                         dev_err(&pdev->dev, "request_irq error (sh_mmc:int)\n");
1460                         goto ereqirq1;
1461                 }
1462         }
1463 
1464         if (pd && pd->use_cd_gpio) {
1465                 ret = mmc_gpio_request_cd(mmc, pd->cd_gpio, 0);
1466                 if (ret < 0)
1467                         goto erqcd;
1468         }
1469 
1470         mutex_init(&host->thread_lock);
1471 
1472         clk_disable_unprepare(host->hclk);
1473         ret = mmc_add_host(mmc);
1474         if (ret < 0)
1475                 goto emmcaddh;
1476 
1477         dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1478 
1479         dev_info(&pdev->dev, "driver version %s\n", DRIVER_VERSION);
1480         dev_dbg(&pdev->dev, "chip ver H'%04x\n",
1481                 sh_mmcif_readl(host->addr, MMCIF_CE_VERSION) & 0x0000ffff);
1482         return ret;
1483 
1484 emmcaddh:
1485 erqcd:
1486         if (irq[1] >= 0)
1487                 free_irq(irq[1], host);
1488 ereqirq1:
1489         free_irq(irq[0], host);
1490 ereqirq0:
1491         pm_runtime_suspend(&pdev->dev);
1492 eresume:
1493         clk_disable_unprepare(host->hclk);
1494 eclkupdate:
1495         clk_put(host->hclk);
1496 eclkget:
1497         pm_runtime_disable(&pdev->dev);
1498 eofparse:
1499         mmc_free_host(mmc);
1500 ealloch:
1501         iounmap(reg);
1502         return ret;
1503 }
1504 
1505 static int sh_mmcif_remove(struct platform_device *pdev)
1506 {
1507         struct sh_mmcif_host *host = platform_get_drvdata(pdev);
1508         int irq[2];
1509 
1510         host->dying = true;
1511         clk_prepare_enable(host->hclk);
1512         pm_runtime_get_sync(&pdev->dev);
1513 
1514         dev_pm_qos_hide_latency_limit(&pdev->dev);
1515 
1516         mmc_remove_host(host->mmc);
1517         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1518 
1519         /*
1520          * FIXME: cancel_delayed_work(_sync)() and free_irq() race with the
1521          * mmc_remove_host() call above. But swapping order doesn't help either
1522          * (a query on the linux-mmc mailing list didn't bring any replies).
1523          */
1524         cancel_delayed_work_sync(&host->timeout_work);
1525 
1526         if (host->addr)
1527                 iounmap(host->addr);
1528 
1529         irq[0] = platform_get_irq(pdev, 0);
1530         irq[1] = platform_get_irq(pdev, 1);
1531 
1532         free_irq(irq[0], host);
1533         if (irq[1] >= 0)
1534                 free_irq(irq[1], host);
1535 
1536         clk_disable_unprepare(host->hclk);
1537         mmc_free_host(host->mmc);
1538         pm_runtime_put_sync(&pdev->dev);
1539         pm_runtime_disable(&pdev->dev);
1540 
1541         return 0;
1542 }
1543 
1544 #ifdef CONFIG_PM_SLEEP
1545 static int sh_mmcif_suspend(struct device *dev)
1546 {
1547         struct sh_mmcif_host *host = dev_get_drvdata(dev);
1548 
1549         sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
1550 
1551         return 0;
1552 }
1553 
1554 static int sh_mmcif_resume(struct device *dev)
1555 {
1556         return 0;
1557 }
1558 #endif
1559 
1560 static const struct of_device_id mmcif_of_match[] = {
1561         { .compatible = "renesas,sh-mmcif" },
1562         { }
1563 };
1564 MODULE_DEVICE_TABLE(of, mmcif_of_match);
1565 
1566 static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
1567         SET_SYSTEM_SLEEP_PM_OPS(sh_mmcif_suspend, sh_mmcif_resume)
1568 };
1569 
1570 static struct platform_driver sh_mmcif_driver = {
1571         .probe          = sh_mmcif_probe,
1572         .remove         = sh_mmcif_remove,
1573         .driver         = {
1574                 .name   = DRIVER_NAME,
1575                 .pm     = &sh_mmcif_dev_pm_ops,
1576                 .owner  = THIS_MODULE,
1577                 .of_match_table = mmcif_of_match,
1578         },
1579 };
1580 
1581 module_platform_driver(sh_mmcif_driver);
1582 
1583 MODULE_DESCRIPTION("SuperH on-chip MMC/eMMC interface driver");
1584 MODULE_LICENSE("GPL");
1585 MODULE_ALIAS("platform:" DRIVER_NAME);
1586 MODULE_AUTHOR("Yusuke Goda <yusuke.goda.sx@renesas.com>");
1587 

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