Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/drivers/mmc/host/dw_mmc.c

  1 /*
  2  * Synopsys DesignWare Multimedia Card Interface driver
  3  *  (Based on NXP driver for lpc 31xx)
  4  *
  5  * Copyright (C) 2009 NXP Semiconductors
  6  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/blkdev.h>
 15 #include <linux/clk.h>
 16 #include <linux/debugfs.h>
 17 #include <linux/device.h>
 18 #include <linux/dma-mapping.h>
 19 #include <linux/err.h>
 20 #include <linux/init.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/ioport.h>
 23 #include <linux/module.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/slab.h>
 27 #include <linux/stat.h>
 28 #include <linux/delay.h>
 29 #include <linux/irq.h>
 30 #include <linux/mmc/card.h>
 31 #include <linux/mmc/host.h>
 32 #include <linux/mmc/mmc.h>
 33 #include <linux/mmc/sd.h>
 34 #include <linux/mmc/sdio.h>
 35 #include <linux/mmc/dw_mmc.h>
 36 #include <linux/bitops.h>
 37 #include <linux/regulator/consumer.h>
 38 #include <linux/of.h>
 39 #include <linux/of_gpio.h>
 40 #include <linux/mmc/slot-gpio.h>
 41 
 42 #include "dw_mmc.h"
 43 
 44 /* Common flag combinations */
 45 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
 46                                  SDMMC_INT_HTO | SDMMC_INT_SBE  | \
 47                                  SDMMC_INT_EBE | SDMMC_INT_HLE)
 48 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
 49                                  SDMMC_INT_RESP_ERR | SDMMC_INT_HLE)
 50 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
 51                                  DW_MCI_CMD_ERROR_FLAGS)
 52 #define DW_MCI_SEND_STATUS      1
 53 #define DW_MCI_RECV_STATUS      2
 54 #define DW_MCI_DMA_THRESHOLD    16
 55 
 56 #define DW_MCI_FREQ_MAX 200000000       /* unit: HZ */
 57 #define DW_MCI_FREQ_MIN 400000          /* unit: HZ */
 58 
 59 #define IDMAC_INT_CLR           (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
 60                                  SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
 61                                  SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
 62                                  SDMMC_IDMAC_INT_TI)
 63 
 64 #define DESC_RING_BUF_SZ        PAGE_SIZE
 65 
 66 struct idmac_desc_64addr {
 67         u32             des0;   /* Control Descriptor */
 68 
 69         u32             des1;   /* Reserved */
 70 
 71         u32             des2;   /*Buffer sizes */
 72 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
 73         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
 74          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
 75 
 76         u32             des3;   /* Reserved */
 77 
 78         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
 79         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
 80 
 81         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
 82         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
 83 };
 84 
 85 struct idmac_desc {
 86         __le32          des0;   /* Control Descriptor */
 87 #define IDMAC_DES0_DIC  BIT(1)
 88 #define IDMAC_DES0_LD   BIT(2)
 89 #define IDMAC_DES0_FD   BIT(3)
 90 #define IDMAC_DES0_CH   BIT(4)
 91 #define IDMAC_DES0_ER   BIT(5)
 92 #define IDMAC_DES0_CES  BIT(30)
 93 #define IDMAC_DES0_OWN  BIT(31)
 94 
 95         __le32          des1;   /* Buffer sizes */
 96 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 97         ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff)))
 98 
 99         __le32          des2;   /* buffer 1 physical address */
100 
101         __le32          des3;   /* buffer 2 physical address */
102 };
103 
104 /* Each descriptor can transfer up to 4KB of data in chained mode */
105 #define DW_MCI_DESC_DATA_LENGTH 0x1000
106 
107 static bool dw_mci_reset(struct dw_mci *host);
108 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
109 static int dw_mci_card_busy(struct mmc_host *mmc);
110 static int dw_mci_get_cd(struct mmc_host *mmc);
111 
112 #if defined(CONFIG_DEBUG_FS)
113 static int dw_mci_req_show(struct seq_file *s, void *v)
114 {
115         struct dw_mci_slot *slot = s->private;
116         struct mmc_request *mrq;
117         struct mmc_command *cmd;
118         struct mmc_command *stop;
119         struct mmc_data *data;
120 
121         /* Make sure we get a consistent snapshot */
122         spin_lock_bh(&slot->host->lock);
123         mrq = slot->mrq;
124 
125         if (mrq) {
126                 cmd = mrq->cmd;
127                 data = mrq->data;
128                 stop = mrq->stop;
129 
130                 if (cmd)
131                         seq_printf(s,
132                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
133                                    cmd->opcode, cmd->arg, cmd->flags,
134                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
135                                    cmd->resp[2], cmd->error);
136                 if (data)
137                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
138                                    data->bytes_xfered, data->blocks,
139                                    data->blksz, data->flags, data->error);
140                 if (stop)
141                         seq_printf(s,
142                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
143                                    stop->opcode, stop->arg, stop->flags,
144                                    stop->resp[0], stop->resp[1], stop->resp[2],
145                                    stop->resp[2], stop->error);
146         }
147 
148         spin_unlock_bh(&slot->host->lock);
149 
150         return 0;
151 }
152 
153 static int dw_mci_req_open(struct inode *inode, struct file *file)
154 {
155         return single_open(file, dw_mci_req_show, inode->i_private);
156 }
157 
158 static const struct file_operations dw_mci_req_fops = {
159         .owner          = THIS_MODULE,
160         .open           = dw_mci_req_open,
161         .read           = seq_read,
162         .llseek         = seq_lseek,
163         .release        = single_release,
164 };
165 
166 static int dw_mci_regs_show(struct seq_file *s, void *v)
167 {
168         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
169         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
170         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
171         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
172         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
173         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
174 
175         return 0;
176 }
177 
178 static int dw_mci_regs_open(struct inode *inode, struct file *file)
179 {
180         return single_open(file, dw_mci_regs_show, inode->i_private);
181 }
182 
183 static const struct file_operations dw_mci_regs_fops = {
184         .owner          = THIS_MODULE,
185         .open           = dw_mci_regs_open,
186         .read           = seq_read,
187         .llseek         = seq_lseek,
188         .release        = single_release,
189 };
190 
191 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
192 {
193         struct mmc_host *mmc = slot->mmc;
194         struct dw_mci *host = slot->host;
195         struct dentry *root;
196         struct dentry *node;
197 
198         root = mmc->debugfs_root;
199         if (!root)
200                 return;
201 
202         node = debugfs_create_file("regs", S_IRUSR, root, host,
203                                    &dw_mci_regs_fops);
204         if (!node)
205                 goto err;
206 
207         node = debugfs_create_file("req", S_IRUSR, root, slot,
208                                    &dw_mci_req_fops);
209         if (!node)
210                 goto err;
211 
212         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
213         if (!node)
214                 goto err;
215 
216         node = debugfs_create_x32("pending_events", S_IRUSR, root,
217                                   (u32 *)&host->pending_events);
218         if (!node)
219                 goto err;
220 
221         node = debugfs_create_x32("completed_events", S_IRUSR, root,
222                                   (u32 *)&host->completed_events);
223         if (!node)
224                 goto err;
225 
226         return;
227 
228 err:
229         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
230 }
231 #endif /* defined(CONFIG_DEBUG_FS) */
232 
233 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
234 
235 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
236 {
237         struct mmc_data *data;
238         struct dw_mci_slot *slot = mmc_priv(mmc);
239         struct dw_mci *host = slot->host;
240         u32 cmdr;
241 
242         cmd->error = -EINPROGRESS;
243         cmdr = cmd->opcode;
244 
245         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
246             cmd->opcode == MMC_GO_IDLE_STATE ||
247             cmd->opcode == MMC_GO_INACTIVE_STATE ||
248             (cmd->opcode == SD_IO_RW_DIRECT &&
249              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
250                 cmdr |= SDMMC_CMD_STOP;
251         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
252                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
253 
254         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
255                 u32 clk_en_a;
256 
257                 /* Special bit makes CMD11 not die */
258                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
259 
260                 /* Change state to continue to handle CMD11 weirdness */
261                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
262                 slot->host->state = STATE_SENDING_CMD11;
263 
264                 /*
265                  * We need to disable low power mode (automatic clock stop)
266                  * while doing voltage switch so we don't confuse the card,
267                  * since stopping the clock is a specific part of the UHS
268                  * voltage change dance.
269                  *
270                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
271                  * unconditionally turned back on in dw_mci_setup_bus() if it's
272                  * ever called with a non-zero clock.  That shouldn't happen
273                  * until the voltage change is all done.
274                  */
275                 clk_en_a = mci_readl(host, CLKENA);
276                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
277                 mci_writel(host, CLKENA, clk_en_a);
278                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
279                              SDMMC_CMD_PRV_DAT_WAIT, 0);
280         }
281 
282         if (cmd->flags & MMC_RSP_PRESENT) {
283                 /* We expect a response, so set this bit */
284                 cmdr |= SDMMC_CMD_RESP_EXP;
285                 if (cmd->flags & MMC_RSP_136)
286                         cmdr |= SDMMC_CMD_RESP_LONG;
287         }
288 
289         if (cmd->flags & MMC_RSP_CRC)
290                 cmdr |= SDMMC_CMD_RESP_CRC;
291 
292         data = cmd->data;
293         if (data) {
294                 cmdr |= SDMMC_CMD_DAT_EXP;
295                 if (data->flags & MMC_DATA_WRITE)
296                         cmdr |= SDMMC_CMD_DAT_WR;
297         }
298 
299         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags))
300                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
301 
302         return cmdr;
303 }
304 
305 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
306 {
307         struct mmc_command *stop;
308         u32 cmdr;
309 
310         if (!cmd->data)
311                 return 0;
312 
313         stop = &host->stop_abort;
314         cmdr = cmd->opcode;
315         memset(stop, 0, sizeof(struct mmc_command));
316 
317         if (cmdr == MMC_READ_SINGLE_BLOCK ||
318             cmdr == MMC_READ_MULTIPLE_BLOCK ||
319             cmdr == MMC_WRITE_BLOCK ||
320             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
321             cmdr == MMC_SEND_TUNING_BLOCK ||
322             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
323                 stop->opcode = MMC_STOP_TRANSMISSION;
324                 stop->arg = 0;
325                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
326         } else if (cmdr == SD_IO_RW_EXTENDED) {
327                 stop->opcode = SD_IO_RW_DIRECT;
328                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
329                              ((cmd->arg >> 28) & 0x7);
330                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
331         } else {
332                 return 0;
333         }
334 
335         cmdr = stop->opcode | SDMMC_CMD_STOP |
336                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
337 
338         return cmdr;
339 }
340 
341 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
342 {
343         unsigned long timeout = jiffies + msecs_to_jiffies(500);
344 
345         /*
346          * Databook says that before issuing a new data transfer command
347          * we need to check to see if the card is busy.  Data transfer commands
348          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
349          *
350          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
351          * expected.
352          */
353         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
354             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
355                 while (mci_readl(host, STATUS) & SDMMC_STATUS_BUSY) {
356                         if (time_after(jiffies, timeout)) {
357                                 /* Command will fail; we'll pass error then */
358                                 dev_err(host->dev, "Busy; trying anyway\n");
359                                 break;
360                         }
361                         udelay(10);
362                 }
363         }
364 }
365 
366 static void dw_mci_start_command(struct dw_mci *host,
367                                  struct mmc_command *cmd, u32 cmd_flags)
368 {
369         host->cmd = cmd;
370         dev_vdbg(host->dev,
371                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
372                  cmd->arg, cmd_flags);
373 
374         mci_writel(host, CMDARG, cmd->arg);
375         wmb(); /* drain writebuffer */
376         dw_mci_wait_while_busy(host, cmd_flags);
377 
378         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
379 }
380 
381 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
382 {
383         struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
384 
385         dw_mci_start_command(host, stop, host->stop_cmdr);
386 }
387 
388 /* DMA interface functions */
389 static void dw_mci_stop_dma(struct dw_mci *host)
390 {
391         if (host->using_dma) {
392                 host->dma_ops->stop(host);
393                 host->dma_ops->cleanup(host);
394         }
395 
396         /* Data transfer was stopped by the interrupt handler */
397         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
398 }
399 
400 static int dw_mci_get_dma_dir(struct mmc_data *data)
401 {
402         if (data->flags & MMC_DATA_WRITE)
403                 return DMA_TO_DEVICE;
404         else
405                 return DMA_FROM_DEVICE;
406 }
407 
408 static void dw_mci_dma_cleanup(struct dw_mci *host)
409 {
410         struct mmc_data *data = host->data;
411 
412         if (data)
413                 if (!data->host_cookie)
414                         dma_unmap_sg(host->dev,
415                                      data->sg,
416                                      data->sg_len,
417                                      dw_mci_get_dma_dir(data));
418 }
419 
420 static void dw_mci_idmac_reset(struct dw_mci *host)
421 {
422         u32 bmod = mci_readl(host, BMOD);
423         /* Software reset of DMA */
424         bmod |= SDMMC_IDMAC_SWRESET;
425         mci_writel(host, BMOD, bmod);
426 }
427 
428 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
429 {
430         u32 temp;
431 
432         /* Disable and reset the IDMAC interface */
433         temp = mci_readl(host, CTRL);
434         temp &= ~SDMMC_CTRL_USE_IDMAC;
435         temp |= SDMMC_CTRL_DMA_RESET;
436         mci_writel(host, CTRL, temp);
437 
438         /* Stop the IDMAC running */
439         temp = mci_readl(host, BMOD);
440         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
441         temp |= SDMMC_IDMAC_SWRESET;
442         mci_writel(host, BMOD, temp);
443 }
444 
445 static void dw_mci_dmac_complete_dma(void *arg)
446 {
447         struct dw_mci *host = arg;
448         struct mmc_data *data = host->data;
449 
450         dev_vdbg(host->dev, "DMA complete\n");
451 
452         if ((host->use_dma == TRANS_MODE_EDMAC) &&
453             data && (data->flags & MMC_DATA_READ))
454                 /* Invalidate cache after read */
455                 dma_sync_sg_for_cpu(mmc_dev(host->cur_slot->mmc),
456                                     data->sg,
457                                     data->sg_len,
458                                     DMA_FROM_DEVICE);
459 
460         host->dma_ops->cleanup(host);
461 
462         /*
463          * If the card was removed, data will be NULL. No point in trying to
464          * send the stop command or waiting for NBUSY in this case.
465          */
466         if (data) {
467                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
468                 tasklet_schedule(&host->tasklet);
469         }
470 }
471 
472 static int dw_mci_idmac_init(struct dw_mci *host)
473 {
474         int i;
475 
476         if (host->dma_64bit_address == 1) {
477                 struct idmac_desc_64addr *p;
478                 /* Number of descriptors in the ring buffer */
479                 host->ring_size =
480                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr);
481 
482                 /* Forward link the descriptor list */
483                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
484                                                                 i++, p++) {
485                         p->des6 = (host->sg_dma +
486                                         (sizeof(struct idmac_desc_64addr) *
487                                                         (i + 1))) & 0xffffffff;
488 
489                         p->des7 = (u64)(host->sg_dma +
490                                         (sizeof(struct idmac_desc_64addr) *
491                                                         (i + 1))) >> 32;
492                         /* Initialize reserved and buffer size fields to "" */
493                         p->des1 = 0;
494                         p->des2 = 0;
495                         p->des3 = 0;
496                 }
497 
498                 /* Set the last descriptor as the end-of-ring descriptor */
499                 p->des6 = host->sg_dma & 0xffffffff;
500                 p->des7 = (u64)host->sg_dma >> 32;
501                 p->des0 = IDMAC_DES0_ER;
502 
503         } else {
504                 struct idmac_desc *p;
505                 /* Number of descriptors in the ring buffer */
506                 host->ring_size =
507                         DESC_RING_BUF_SZ / sizeof(struct idmac_desc);
508 
509                 /* Forward link the descriptor list */
510                 for (i = 0, p = host->sg_cpu;
511                      i < host->ring_size - 1;
512                      i++, p++) {
513                         p->des3 = cpu_to_le32(host->sg_dma +
514                                         (sizeof(struct idmac_desc) * (i + 1)));
515                         p->des1 = 0;
516                 }
517 
518                 /* Set the last descriptor as the end-of-ring descriptor */
519                 p->des3 = cpu_to_le32(host->sg_dma);
520                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
521         }
522 
523         dw_mci_idmac_reset(host);
524 
525         if (host->dma_64bit_address == 1) {
526                 /* Mask out interrupts - get Tx & Rx complete only */
527                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
528                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
529                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
530 
531                 /* Set the descriptor base address */
532                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
533                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
534 
535         } else {
536                 /* Mask out interrupts - get Tx & Rx complete only */
537                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
538                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
539                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
540 
541                 /* Set the descriptor base address */
542                 mci_writel(host, DBADDR, host->sg_dma);
543         }
544 
545         return 0;
546 }
547 
548 static inline int dw_mci_prepare_desc64(struct dw_mci *host,
549                                          struct mmc_data *data,
550                                          unsigned int sg_len)
551 {
552         unsigned int desc_len;
553         struct idmac_desc_64addr *desc_first, *desc_last, *desc;
554         unsigned long timeout;
555         int i;
556 
557         desc_first = desc_last = desc = host->sg_cpu;
558 
559         for (i = 0; i < sg_len; i++) {
560                 unsigned int length = sg_dma_len(&data->sg[i]);
561 
562                 u64 mem_addr = sg_dma_address(&data->sg[i]);
563 
564                 for ( ; length ; desc++) {
565                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
566                                    length : DW_MCI_DESC_DATA_LENGTH;
567 
568                         length -= desc_len;
569 
570                         /*
571                          * Wait for the former clear OWN bit operation
572                          * of IDMAC to make sure that this descriptor
573                          * isn't still owned by IDMAC as IDMAC's write
574                          * ops and CPU's read ops are asynchronous.
575                          */
576                         timeout = jiffies + msecs_to_jiffies(100);
577                         while (readl(&desc->des0) & IDMAC_DES0_OWN) {
578                                 if (time_after(jiffies, timeout))
579                                         goto err_own_bit;
580                                 udelay(10);
581                         }
582 
583                         /*
584                          * Set the OWN bit and disable interrupts
585                          * for this descriptor
586                          */
587                         desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
588                                                 IDMAC_DES0_CH;
589 
590                         /* Buffer length */
591                         IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);
592 
593                         /* Physical address to DMA to/from */
594                         desc->des4 = mem_addr & 0xffffffff;
595                         desc->des5 = mem_addr >> 32;
596 
597                         /* Update physical address for the next desc */
598                         mem_addr += desc_len;
599 
600                         /* Save pointer to the last descriptor */
601                         desc_last = desc;
602                 }
603         }
604 
605         /* Set first descriptor */
606         desc_first->des0 |= IDMAC_DES0_FD;
607 
608         /* Set last descriptor */
609         desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
610         desc_last->des0 |= IDMAC_DES0_LD;
611 
612         return 0;
613 err_own_bit:
614         /* restore the descriptor chain as it's polluted */
615         dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
616         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
617         dw_mci_idmac_init(host);
618         return -EINVAL;
619 }
620 
621 
622 static inline int dw_mci_prepare_desc32(struct dw_mci *host,
623                                          struct mmc_data *data,
624                                          unsigned int sg_len)
625 {
626         unsigned int desc_len;
627         struct idmac_desc *desc_first, *desc_last, *desc;
628         unsigned long timeout;
629         int i;
630 
631         desc_first = desc_last = desc = host->sg_cpu;
632 
633         for (i = 0; i < sg_len; i++) {
634                 unsigned int length = sg_dma_len(&data->sg[i]);
635 
636                 u32 mem_addr = sg_dma_address(&data->sg[i]);
637 
638                 for ( ; length ; desc++) {
639                         desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
640                                    length : DW_MCI_DESC_DATA_LENGTH;
641 
642                         length -= desc_len;
643 
644                         /*
645                          * Wait for the former clear OWN bit operation
646                          * of IDMAC to make sure that this descriptor
647                          * isn't still owned by IDMAC as IDMAC's write
648                          * ops and CPU's read ops are asynchronous.
649                          */
650                         timeout = jiffies + msecs_to_jiffies(100);
651                         while (readl(&desc->des0) &
652                                cpu_to_le32(IDMAC_DES0_OWN)) {
653                                 if (time_after(jiffies, timeout))
654                                         goto err_own_bit;
655                                 udelay(10);
656                         }
657 
658                         /*
659                          * Set the OWN bit and disable interrupts
660                          * for this descriptor
661                          */
662                         desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
663                                                  IDMAC_DES0_DIC |
664                                                  IDMAC_DES0_CH);
665 
666                         /* Buffer length */
667                         IDMAC_SET_BUFFER1_SIZE(desc, desc_len);
668 
669                         /* Physical address to DMA to/from */
670                         desc->des2 = cpu_to_le32(mem_addr);
671 
672                         /* Update physical address for the next desc */
673                         mem_addr += desc_len;
674 
675                         /* Save pointer to the last descriptor */
676                         desc_last = desc;
677                 }
678         }
679 
680         /* Set first descriptor */
681         desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);
682 
683         /* Set last descriptor */
684         desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
685                                        IDMAC_DES0_DIC));
686         desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
687 
688         return 0;
689 err_own_bit:
690         /* restore the descriptor chain as it's polluted */
691         dev_dbg(host->dev, "desciptor is still owned by IDMAC.\n");
692         memset(host->sg_cpu, 0, DESC_RING_BUF_SZ);
693         dw_mci_idmac_init(host);
694         return -EINVAL;
695 }
696 
697 static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
698 {
699         u32 temp;
700         int ret;
701 
702         if (host->dma_64bit_address == 1)
703                 ret = dw_mci_prepare_desc64(host, host->data, sg_len);
704         else
705                 ret = dw_mci_prepare_desc32(host, host->data, sg_len);
706 
707         if (ret)
708                 goto out;
709 
710         /* drain writebuffer */
711         wmb();
712 
713         /* Make sure to reset DMA in case we did PIO before this */
714         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
715         dw_mci_idmac_reset(host);
716 
717         /* Select IDMAC interface */
718         temp = mci_readl(host, CTRL);
719         temp |= SDMMC_CTRL_USE_IDMAC;
720         mci_writel(host, CTRL, temp);
721 
722         /* drain writebuffer */
723         wmb();
724 
725         /* Enable the IDMAC */
726         temp = mci_readl(host, BMOD);
727         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
728         mci_writel(host, BMOD, temp);
729 
730         /* Start it running */
731         mci_writel(host, PLDMND, 1);
732 
733 out:
734         return ret;
735 }
736 
737 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
738         .init = dw_mci_idmac_init,
739         .start = dw_mci_idmac_start_dma,
740         .stop = dw_mci_idmac_stop_dma,
741         .complete = dw_mci_dmac_complete_dma,
742         .cleanup = dw_mci_dma_cleanup,
743 };
744 
745 static void dw_mci_edmac_stop_dma(struct dw_mci *host)
746 {
747         dmaengine_terminate_async(host->dms->ch);
748 }
749 
750 static int dw_mci_edmac_start_dma(struct dw_mci *host,
751                                             unsigned int sg_len)
752 {
753         struct dma_slave_config cfg;
754         struct dma_async_tx_descriptor *desc = NULL;
755         struct scatterlist *sgl = host->data->sg;
756         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
757         u32 sg_elems = host->data->sg_len;
758         u32 fifoth_val;
759         u32 fifo_offset = host->fifo_reg - host->regs;
760         int ret = 0;
761 
762         /* Set external dma config: burst size, burst width */
763         cfg.dst_addr = host->phy_regs + fifo_offset;
764         cfg.src_addr = cfg.dst_addr;
765         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
766         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
767 
768         /* Match burst msize with external dma config */
769         fifoth_val = mci_readl(host, FIFOTH);
770         cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7];
771         cfg.src_maxburst = cfg.dst_maxburst;
772 
773         if (host->data->flags & MMC_DATA_WRITE)
774                 cfg.direction = DMA_MEM_TO_DEV;
775         else
776                 cfg.direction = DMA_DEV_TO_MEM;
777 
778         ret = dmaengine_slave_config(host->dms->ch, &cfg);
779         if (ret) {
780                 dev_err(host->dev, "Failed to config edmac.\n");
781                 return -EBUSY;
782         }
783 
784         desc = dmaengine_prep_slave_sg(host->dms->ch, sgl,
785                                        sg_len, cfg.direction,
786                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
787         if (!desc) {
788                 dev_err(host->dev, "Can't prepare slave sg.\n");
789                 return -EBUSY;
790         }
791 
792         /* Set dw_mci_dmac_complete_dma as callback */
793         desc->callback = dw_mci_dmac_complete_dma;
794         desc->callback_param = (void *)host;
795         dmaengine_submit(desc);
796 
797         /* Flush cache before write */
798         if (host->data->flags & MMC_DATA_WRITE)
799                 dma_sync_sg_for_device(mmc_dev(host->cur_slot->mmc), sgl,
800                                        sg_elems, DMA_TO_DEVICE);
801 
802         dma_async_issue_pending(host->dms->ch);
803 
804         return 0;
805 }
806 
807 static int dw_mci_edmac_init(struct dw_mci *host)
808 {
809         /* Request external dma channel */
810         host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL);
811         if (!host->dms)
812                 return -ENOMEM;
813 
814         host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
815         if (!host->dms->ch) {
816                 dev_err(host->dev, "Failed to get external DMA channel.\n");
817                 kfree(host->dms);
818                 host->dms = NULL;
819                 return -ENXIO;
820         }
821 
822         return 0;
823 }
824 
825 static void dw_mci_edmac_exit(struct dw_mci *host)
826 {
827         if (host->dms) {
828                 if (host->dms->ch) {
829                         dma_release_channel(host->dms->ch);
830                         host->dms->ch = NULL;
831                 }
832                 kfree(host->dms);
833                 host->dms = NULL;
834         }
835 }
836 
837 static const struct dw_mci_dma_ops dw_mci_edmac_ops = {
838         .init = dw_mci_edmac_init,
839         .exit = dw_mci_edmac_exit,
840         .start = dw_mci_edmac_start_dma,
841         .stop = dw_mci_edmac_stop_dma,
842         .complete = dw_mci_dmac_complete_dma,
843         .cleanup = dw_mci_dma_cleanup,
844 };
845 
846 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
847                                    struct mmc_data *data,
848                                    bool next)
849 {
850         struct scatterlist *sg;
851         unsigned int i, sg_len;
852 
853         if (!next && data->host_cookie)
854                 return data->host_cookie;
855 
856         /*
857          * We don't do DMA on "complex" transfers, i.e. with
858          * non-word-aligned buffers or lengths. Also, we don't bother
859          * with all the DMA setup overhead for short transfers.
860          */
861         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
862                 return -EINVAL;
863 
864         if (data->blksz & 3)
865                 return -EINVAL;
866 
867         for_each_sg(data->sg, sg, data->sg_len, i) {
868                 if (sg->offset & 3 || sg->length & 3)
869                         return -EINVAL;
870         }
871 
872         sg_len = dma_map_sg(host->dev,
873                             data->sg,
874                             data->sg_len,
875                             dw_mci_get_dma_dir(data));
876         if (sg_len == 0)
877                 return -EINVAL;
878 
879         if (next)
880                 data->host_cookie = sg_len;
881 
882         return sg_len;
883 }
884 
885 static void dw_mci_pre_req(struct mmc_host *mmc,
886                            struct mmc_request *mrq,
887                            bool is_first_req)
888 {
889         struct dw_mci_slot *slot = mmc_priv(mmc);
890         struct mmc_data *data = mrq->data;
891 
892         if (!slot->host->use_dma || !data)
893                 return;
894 
895         if (data->host_cookie) {
896                 data->host_cookie = 0;
897                 return;
898         }
899 
900         if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
901                 data->host_cookie = 0;
902 }
903 
904 static void dw_mci_post_req(struct mmc_host *mmc,
905                             struct mmc_request *mrq,
906                             int err)
907 {
908         struct dw_mci_slot *slot = mmc_priv(mmc);
909         struct mmc_data *data = mrq->data;
910 
911         if (!slot->host->use_dma || !data)
912                 return;
913 
914         if (data->host_cookie)
915                 dma_unmap_sg(slot->host->dev,
916                              data->sg,
917                              data->sg_len,
918                              dw_mci_get_dma_dir(data));
919         data->host_cookie = 0;
920 }
921 
922 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
923 {
924         unsigned int blksz = data->blksz;
925         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
926         u32 fifo_width = 1 << host->data_shift;
927         u32 blksz_depth = blksz / fifo_width, fifoth_val;
928         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
929         int idx = ARRAY_SIZE(mszs) - 1;
930 
931         /* pio should ship this scenario */
932         if (!host->use_dma)
933                 return;
934 
935         tx_wmark = (host->fifo_depth) / 2;
936         tx_wmark_invers = host->fifo_depth - tx_wmark;
937 
938         /*
939          * MSIZE is '1',
940          * if blksz is not a multiple of the FIFO width
941          */
942         if (blksz % fifo_width)
943                 goto done;
944 
945         do {
946                 if (!((blksz_depth % mszs[idx]) ||
947                      (tx_wmark_invers % mszs[idx]))) {
948                         msize = idx;
949                         rx_wmark = mszs[idx] - 1;
950                         break;
951                 }
952         } while (--idx > 0);
953         /*
954          * If idx is '', it won't be tried
955          * Thus, initial values are uesed
956          */
957 done:
958         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
959         mci_writel(host, FIFOTH, fifoth_val);
960 }
961 
962 static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
963 {
964         unsigned int blksz = data->blksz;
965         u32 blksz_depth, fifo_depth;
966         u16 thld_size;
967         u8 enable;
968 
969         /*
970          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
971          * in the FIFO region, so we really shouldn't access it).
972          */
973         if (host->verid < DW_MMC_240A ||
974                 (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE))
975                 return;
976 
977         /*
978          * Card write Threshold is introduced since 2.80a
979          * It's used when HS400 mode is enabled.
980          */
981         if (data->flags & MMC_DATA_WRITE &&
982                 !(host->timing != MMC_TIMING_MMC_HS400))
983                 return;
984 
985         if (data->flags & MMC_DATA_WRITE)
986                 enable = SDMMC_CARD_WR_THR_EN;
987         else
988                 enable = SDMMC_CARD_RD_THR_EN;
989 
990         if (host->timing != MMC_TIMING_MMC_HS200 &&
991             host->timing != MMC_TIMING_UHS_SDR104)
992                 goto disable;
993 
994         blksz_depth = blksz / (1 << host->data_shift);
995         fifo_depth = host->fifo_depth;
996 
997         if (blksz_depth > fifo_depth)
998                 goto disable;
999 
1000         /*
1001          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
1002          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
1003          * Currently just choose blksz.
1004          */
1005         thld_size = blksz;
1006         mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable));
1007         return;
1008 
1009 disable:
1010         mci_writel(host, CDTHRCTL, 0);
1011 }
1012 
1013 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
1014 {
1015         unsigned long irqflags;
1016         int sg_len;
1017         u32 temp;
1018 
1019         host->using_dma = 0;
1020 
1021         /* If we don't have a channel, we can't do DMA */
1022         if (!host->use_dma)
1023                 return -ENODEV;
1024 
1025         sg_len = dw_mci_pre_dma_transfer(host, data, 0);
1026         if (sg_len < 0) {
1027                 host->dma_ops->stop(host);
1028                 return sg_len;
1029         }
1030 
1031         host->using_dma = 1;
1032 
1033         if (host->use_dma == TRANS_MODE_IDMAC)
1034                 dev_vdbg(host->dev,
1035                          "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
1036                          (unsigned long)host->sg_cpu,
1037                          (unsigned long)host->sg_dma,
1038                          sg_len);
1039 
1040         /*
1041          * Decide the MSIZE and RX/TX Watermark.
1042          * If current block size is same with previous size,
1043          * no need to update fifoth.
1044          */
1045         if (host->prev_blksz != data->blksz)
1046                 dw_mci_adjust_fifoth(host, data);
1047 
1048         /* Enable the DMA interface */
1049         temp = mci_readl(host, CTRL);
1050         temp |= SDMMC_CTRL_DMA_ENABLE;
1051         mci_writel(host, CTRL, temp);
1052 
1053         /* Disable RX/TX IRQs, let DMA handle it */
1054         spin_lock_irqsave(&host->irq_lock, irqflags);
1055         temp = mci_readl(host, INTMASK);
1056         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
1057         mci_writel(host, INTMASK, temp);
1058         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1059 
1060         if (host->dma_ops->start(host, sg_len)) {
1061                 host->dma_ops->stop(host);
1062                 /* We can't do DMA, try PIO for this one */
1063                 dev_dbg(host->dev,
1064                         "%s: fall back to PIO mode for current transfer\n",
1065                         __func__);
1066                 return -ENODEV;
1067         }
1068 
1069         return 0;
1070 }
1071 
1072 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
1073 {
1074         unsigned long irqflags;
1075         int flags = SG_MITER_ATOMIC;
1076         u32 temp;
1077 
1078         data->error = -EINPROGRESS;
1079 
1080         WARN_ON(host->data);
1081         host->sg = NULL;
1082         host->data = data;
1083 
1084         if (data->flags & MMC_DATA_READ)
1085                 host->dir_status = DW_MCI_RECV_STATUS;
1086         else
1087                 host->dir_status = DW_MCI_SEND_STATUS;
1088 
1089         dw_mci_ctrl_thld(host, data);
1090 
1091         if (dw_mci_submit_data_dma(host, data)) {
1092                 if (host->data->flags & MMC_DATA_READ)
1093                         flags |= SG_MITER_TO_SG;
1094                 else
1095                         flags |= SG_MITER_FROM_SG;
1096 
1097                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1098                 host->sg = data->sg;
1099                 host->part_buf_start = 0;
1100                 host->part_buf_count = 0;
1101 
1102                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
1103 
1104                 spin_lock_irqsave(&host->irq_lock, irqflags);
1105                 temp = mci_readl(host, INTMASK);
1106                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
1107                 mci_writel(host, INTMASK, temp);
1108                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1109 
1110                 temp = mci_readl(host, CTRL);
1111                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
1112                 mci_writel(host, CTRL, temp);
1113 
1114                 /*
1115                  * Use the initial fifoth_val for PIO mode.
1116                  * If next issued data may be transfered by DMA mode,
1117                  * prev_blksz should be invalidated.
1118                  */
1119                 mci_writel(host, FIFOTH, host->fifoth_val);
1120                 host->prev_blksz = 0;
1121         } else {
1122                 /*
1123                  * Keep the current block size.
1124                  * It will be used to decide whether to update
1125                  * fifoth register next time.
1126                  */
1127                 host->prev_blksz = data->blksz;
1128         }
1129 }
1130 
1131 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
1132 {
1133         struct dw_mci *host = slot->host;
1134         unsigned long timeout = jiffies + msecs_to_jiffies(500);
1135         unsigned int cmd_status = 0;
1136 
1137         mci_writel(host, CMDARG, arg);
1138         wmb(); /* drain writebuffer */
1139         dw_mci_wait_while_busy(host, cmd);
1140         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
1141 
1142         while (time_before(jiffies, timeout)) {
1143                 cmd_status = mci_readl(host, CMD);
1144                 if (!(cmd_status & SDMMC_CMD_START))
1145                         return;
1146         }
1147         dev_err(&slot->mmc->class_dev,
1148                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
1149                 cmd, arg, cmd_status);
1150 }
1151 
1152 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
1153 {
1154         struct dw_mci *host = slot->host;
1155         unsigned int clock = slot->clock;
1156         u32 div;
1157         u32 clk_en_a;
1158         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
1159 
1160         /* We must continue to set bit 28 in CMD until the change is complete */
1161         if (host->state == STATE_WAITING_CMD11_DONE)
1162                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
1163 
1164         if (!clock) {
1165                 mci_writel(host, CLKENA, 0);
1166                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1167         } else if (clock != host->current_speed || force_clkinit) {
1168                 div = host->bus_hz / clock;
1169                 if (host->bus_hz % clock && host->bus_hz > clock)
1170                         /*
1171                          * move the + 1 after the divide to prevent
1172                          * over-clocking the card.
1173                          */
1174                         div += 1;
1175 
1176                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
1177 
1178                 if (clock != slot->__clk_old || force_clkinit)
1179                         dev_info(&slot->mmc->class_dev,
1180                                  "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
1181                                  slot->id, host->bus_hz, clock,
1182                                  div ? ((host->bus_hz / div) >> 1) :
1183                                  host->bus_hz, div);
1184 
1185                 /* disable clock */
1186                 mci_writel(host, CLKENA, 0);
1187                 mci_writel(host, CLKSRC, 0);
1188 
1189                 /* inform CIU */
1190                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1191 
1192                 /* set clock to desired speed */
1193                 mci_writel(host, CLKDIV, div);
1194 
1195                 /* inform CIU */
1196                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1197 
1198                 /* enable clock; only low power if no SDIO */
1199                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
1200                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
1201                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
1202                 mci_writel(host, CLKENA, clk_en_a);
1203 
1204                 /* inform CIU */
1205                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1206 
1207                 /* keep the last clock value that was requested from core */
1208                 slot->__clk_old = clock;
1209         }
1210 
1211         host->current_speed = clock;
1212 
1213         /* Set the current slot bus width */
1214         mci_writel(host, CTYPE, (slot->ctype << slot->id));
1215 }
1216 
1217 static void __dw_mci_start_request(struct dw_mci *host,
1218                                    struct dw_mci_slot *slot,
1219                                    struct mmc_command *cmd)
1220 {
1221         struct mmc_request *mrq;
1222         struct mmc_data *data;
1223         u32 cmdflags;
1224 
1225         mrq = slot->mrq;
1226 
1227         host->cur_slot = slot;
1228         host->mrq = mrq;
1229 
1230         host->pending_events = 0;
1231         host->completed_events = 0;
1232         host->cmd_status = 0;
1233         host->data_status = 0;
1234         host->dir_status = 0;
1235 
1236         data = cmd->data;
1237         if (data) {
1238                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1239                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1240                 mci_writel(host, BLKSIZ, data->blksz);
1241         }
1242 
1243         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1244 
1245         /* this is the first command, send the initialization clock */
1246         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1247                 cmdflags |= SDMMC_CMD_INIT;
1248 
1249         if (data) {
1250                 dw_mci_submit_data(host, data);
1251                 wmb(); /* drain writebuffer */
1252         }
1253 
1254         dw_mci_start_command(host, cmd, cmdflags);
1255 
1256         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1257                 unsigned long irqflags;
1258 
1259                 /*
1260                  * Databook says to fail after 2ms w/ no response, but evidence
1261                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1262                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1263                  * is just about to roll over.
1264                  *
1265                  * We do this whole thing under spinlock and only if the
1266                  * command hasn't already completed (indicating the the irq
1267                  * already ran so we don't want the timeout).
1268                  */
1269                 spin_lock_irqsave(&host->irq_lock, irqflags);
1270                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1271                         mod_timer(&host->cmd11_timer,
1272                                 jiffies + msecs_to_jiffies(500) + 1);
1273                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1274         }
1275 
1276         if (mrq->stop)
1277                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
1278         else
1279                 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1280 }
1281 
1282 static void dw_mci_start_request(struct dw_mci *host,
1283                                  struct dw_mci_slot *slot)
1284 {
1285         struct mmc_request *mrq = slot->mrq;
1286         struct mmc_command *cmd;
1287 
1288         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1289         __dw_mci_start_request(host, slot, cmd);
1290 }
1291 
1292 /* must be called with host->lock held */
1293 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1294                                  struct mmc_request *mrq)
1295 {
1296         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1297                  host->state);
1298 
1299         slot->mrq = mrq;
1300 
1301         if (host->state == STATE_WAITING_CMD11_DONE) {
1302                 dev_warn(&slot->mmc->class_dev,
1303                          "Voltage change didn't complete\n");
1304                 /*
1305                  * this case isn't expected to happen, so we can
1306                  * either crash here or just try to continue on
1307                  * in the closest possible state
1308                  */
1309                 host->state = STATE_IDLE;
1310         }
1311 
1312         if (host->state == STATE_IDLE) {
1313                 host->state = STATE_SENDING_CMD;
1314                 dw_mci_start_request(host, slot);
1315         } else {
1316                 list_add_tail(&slot->queue_node, &host->queue);
1317         }
1318 }
1319 
1320 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1321 {
1322         struct dw_mci_slot *slot = mmc_priv(mmc);
1323         struct dw_mci *host = slot->host;
1324 
1325         WARN_ON(slot->mrq);
1326 
1327         /*
1328          * The check for card presence and queueing of the request must be
1329          * atomic, otherwise the card could be removed in between and the
1330          * request wouldn't fail until another card was inserted.
1331          */
1332 
1333         if (!dw_mci_get_cd(mmc)) {
1334                 mrq->cmd->error = -ENOMEDIUM;
1335                 mmc_request_done(mmc, mrq);
1336                 return;
1337         }
1338 
1339         spin_lock_bh(&host->lock);
1340 
1341         dw_mci_queue_request(host, slot, mrq);
1342 
1343         spin_unlock_bh(&host->lock);
1344 }
1345 
1346 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1347 {
1348         struct dw_mci_slot *slot = mmc_priv(mmc);
1349         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1350         u32 regs;
1351         int ret;
1352 
1353         switch (ios->bus_width) {
1354         case MMC_BUS_WIDTH_4:
1355                 slot->ctype = SDMMC_CTYPE_4BIT;
1356                 break;
1357         case MMC_BUS_WIDTH_8:
1358                 slot->ctype = SDMMC_CTYPE_8BIT;
1359                 break;
1360         default:
1361                 /* set default 1 bit mode */
1362                 slot->ctype = SDMMC_CTYPE_1BIT;
1363         }
1364 
1365         regs = mci_readl(slot->host, UHS_REG);
1366 
1367         /* DDR mode set */
1368         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1369             ios->timing == MMC_TIMING_UHS_DDR50 ||
1370             ios->timing == MMC_TIMING_MMC_HS400)
1371                 regs |= ((0x1 << slot->id) << 16);
1372         else
1373                 regs &= ~((0x1 << slot->id) << 16);
1374 
1375         mci_writel(slot->host, UHS_REG, regs);
1376         slot->host->timing = ios->timing;
1377 
1378         /*
1379          * Use mirror of ios->clock to prevent race with mmc
1380          * core ios update when finding the minimum.
1381          */
1382         slot->clock = ios->clock;
1383 
1384         if (drv_data && drv_data->set_ios)
1385                 drv_data->set_ios(slot->host, ios);
1386 
1387         switch (ios->power_mode) {
1388         case MMC_POWER_UP:
1389                 if (!IS_ERR(mmc->supply.vmmc)) {
1390                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1391                                         ios->vdd);
1392                         if (ret) {
1393                                 dev_err(slot->host->dev,
1394                                         "failed to enable vmmc regulator\n");
1395                                 /*return, if failed turn on vmmc*/
1396                                 return;
1397                         }
1398                 }
1399                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1400                 regs = mci_readl(slot->host, PWREN);
1401                 regs |= (1 << slot->id);
1402                 mci_writel(slot->host, PWREN, regs);
1403                 break;
1404         case MMC_POWER_ON:
1405                 if (!slot->host->vqmmc_enabled) {
1406                         if (!IS_ERR(mmc->supply.vqmmc)) {
1407                                 ret = regulator_enable(mmc->supply.vqmmc);
1408                                 if (ret < 0)
1409                                         dev_err(slot->host->dev,
1410                                                 "failed to enable vqmmc\n");
1411                                 else
1412                                         slot->host->vqmmc_enabled = true;
1413 
1414                         } else {
1415                                 /* Keep track so we don't reset again */
1416                                 slot->host->vqmmc_enabled = true;
1417                         }
1418 
1419                         /* Reset our state machine after powering on */
1420                         dw_mci_ctrl_reset(slot->host,
1421                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1422                 }
1423 
1424                 /* Adjust clock / bus width after power is up */
1425                 dw_mci_setup_bus(slot, false);
1426 
1427                 break;
1428         case MMC_POWER_OFF:
1429                 /* Turn clock off before power goes down */
1430                 dw_mci_setup_bus(slot, false);
1431 
1432                 if (!IS_ERR(mmc->supply.vmmc))
1433                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1434 
1435                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1436                         regulator_disable(mmc->supply.vqmmc);
1437                 slot->host->vqmmc_enabled = false;
1438 
1439                 regs = mci_readl(slot->host, PWREN);
1440                 regs &= ~(1 << slot->id);
1441                 mci_writel(slot->host, PWREN, regs);
1442                 break;
1443         default:
1444                 break;
1445         }
1446 
1447         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1448                 slot->host->state = STATE_IDLE;
1449 }
1450 
1451 static int dw_mci_card_busy(struct mmc_host *mmc)
1452 {
1453         struct dw_mci_slot *slot = mmc_priv(mmc);
1454         u32 status;
1455 
1456         /*
1457          * Check the busy bit which is low when DAT[3:0]
1458          * (the data lines) are 0000
1459          */
1460         status = mci_readl(slot->host, STATUS);
1461 
1462         return !!(status & SDMMC_STATUS_BUSY);
1463 }
1464 
1465 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1466 {
1467         struct dw_mci_slot *slot = mmc_priv(mmc);
1468         struct dw_mci *host = slot->host;
1469         const struct dw_mci_drv_data *drv_data = host->drv_data;
1470         u32 uhs;
1471         u32 v18 = SDMMC_UHS_18V << slot->id;
1472         int ret;
1473 
1474         if (drv_data && drv_data->switch_voltage)
1475                 return drv_data->switch_voltage(mmc, ios);
1476 
1477         /*
1478          * Program the voltage.  Note that some instances of dw_mmc may use
1479          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1480          * does no harm but you need to set the regulator directly.  Try both.
1481          */
1482         uhs = mci_readl(host, UHS_REG);
1483         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1484                 uhs &= ~v18;
1485         else
1486                 uhs |= v18;
1487 
1488         if (!IS_ERR(mmc->supply.vqmmc)) {
1489                 ret = mmc_regulator_set_vqmmc(mmc, ios);
1490 
1491                 if (ret) {
1492                         dev_dbg(&mmc->class_dev,
1493                                          "Regulator set error %d - %s V\n",
1494                                          ret, uhs & v18 ? "1.8" : "3.3");
1495                         return ret;
1496                 }
1497         }
1498         mci_writel(host, UHS_REG, uhs);
1499 
1500         return 0;
1501 }
1502 
1503 static int dw_mci_get_ro(struct mmc_host *mmc)
1504 {
1505         int read_only;
1506         struct dw_mci_slot *slot = mmc_priv(mmc);
1507         int gpio_ro = mmc_gpio_get_ro(mmc);
1508 
1509         /* Use platform get_ro function, else try on board write protect */
1510         if (gpio_ro >= 0)
1511                 read_only = gpio_ro;
1512         else
1513                 read_only =
1514                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1515 
1516         dev_dbg(&mmc->class_dev, "card is %s\n",
1517                 read_only ? "read-only" : "read-write");
1518 
1519         return read_only;
1520 }
1521 
1522 static int dw_mci_get_cd(struct mmc_host *mmc)
1523 {
1524         int present;
1525         struct dw_mci_slot *slot = mmc_priv(mmc);
1526         struct dw_mci *host = slot->host;
1527         int gpio_cd = mmc_gpio_get_cd(mmc);
1528 
1529         /* Use platform get_cd function, else try onboard card detect */
1530         if ((mmc->caps & MMC_CAP_NEEDS_POLL) || !mmc_card_is_removable(mmc))
1531                 present = 1;
1532         else if (gpio_cd >= 0)
1533                 present = gpio_cd;
1534         else
1535                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1536                         == 0 ? 1 : 0;
1537 
1538         spin_lock_bh(&host->lock);
1539         if (present) {
1540                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1541                 dev_dbg(&mmc->class_dev, "card is present\n");
1542         } else {
1543                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1544                 dev_dbg(&mmc->class_dev, "card is not present\n");
1545         }
1546         spin_unlock_bh(&host->lock);
1547 
1548         return present;
1549 }
1550 
1551 static void dw_mci_hw_reset(struct mmc_host *mmc)
1552 {
1553         struct dw_mci_slot *slot = mmc_priv(mmc);
1554         struct dw_mci *host = slot->host;
1555         int reset;
1556 
1557         if (host->use_dma == TRANS_MODE_IDMAC)
1558                 dw_mci_idmac_reset(host);
1559 
1560         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET |
1561                                      SDMMC_CTRL_FIFO_RESET))
1562                 return;
1563 
1564         /*
1565          * According to eMMC spec, card reset procedure:
1566          * tRstW >= 1us:   RST_n pulse width
1567          * tRSCA >= 200us: RST_n to Command time
1568          * tRSTH >= 1us:   RST_n high period
1569          */
1570         reset = mci_readl(host, RST_N);
1571         reset &= ~(SDMMC_RST_HWACTIVE << slot->id);
1572         mci_writel(host, RST_N, reset);
1573         usleep_range(1, 2);
1574         reset |= SDMMC_RST_HWACTIVE << slot->id;
1575         mci_writel(host, RST_N, reset);
1576         usleep_range(200, 300);
1577 }
1578 
1579 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1580 {
1581         struct dw_mci_slot *slot = mmc_priv(mmc);
1582         struct dw_mci *host = slot->host;
1583 
1584         /*
1585          * Low power mode will stop the card clock when idle.  According to the
1586          * description of the CLKENA register we should disable low power mode
1587          * for SDIO cards if we need SDIO interrupts to work.
1588          */
1589         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1590                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1591                 u32 clk_en_a_old;
1592                 u32 clk_en_a;
1593 
1594                 clk_en_a_old = mci_readl(host, CLKENA);
1595 
1596                 if (card->type == MMC_TYPE_SDIO ||
1597                     card->type == MMC_TYPE_SD_COMBO) {
1598                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1599                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1600                 } else {
1601                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1602                         clk_en_a = clk_en_a_old | clken_low_pwr;
1603                 }
1604 
1605                 if (clk_en_a != clk_en_a_old) {
1606                         mci_writel(host, CLKENA, clk_en_a);
1607                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1608                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1609                 }
1610         }
1611 }
1612 
1613 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1614 {
1615         struct dw_mci_slot *slot = mmc_priv(mmc);
1616         struct dw_mci *host = slot->host;
1617         unsigned long irqflags;
1618         u32 int_mask;
1619 
1620         spin_lock_irqsave(&host->irq_lock, irqflags);
1621 
1622         /* Enable/disable Slot Specific SDIO interrupt */
1623         int_mask = mci_readl(host, INTMASK);
1624         if (enb)
1625                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1626         else
1627                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1628         mci_writel(host, INTMASK, int_mask);
1629 
1630         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1631 }
1632 
1633 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1634 {
1635         struct dw_mci_slot *slot = mmc_priv(mmc);
1636         struct dw_mci *host = slot->host;
1637         const struct dw_mci_drv_data *drv_data = host->drv_data;
1638         int err = -EINVAL;
1639 
1640         if (drv_data && drv_data->execute_tuning)
1641                 err = drv_data->execute_tuning(slot, opcode);
1642         return err;
1643 }
1644 
1645 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc,
1646                                        struct mmc_ios *ios)
1647 {
1648         struct dw_mci_slot *slot = mmc_priv(mmc);
1649         struct dw_mci *host = slot->host;
1650         const struct dw_mci_drv_data *drv_data = host->drv_data;
1651 
1652         if (drv_data && drv_data->prepare_hs400_tuning)
1653                 return drv_data->prepare_hs400_tuning(host, ios);
1654 
1655         return 0;
1656 }
1657 
1658 static const struct mmc_host_ops dw_mci_ops = {
1659         .request                = dw_mci_request,
1660         .pre_req                = dw_mci_pre_req,
1661         .post_req               = dw_mci_post_req,
1662         .set_ios                = dw_mci_set_ios,
1663         .get_ro                 = dw_mci_get_ro,
1664         .get_cd                 = dw_mci_get_cd,
1665         .hw_reset               = dw_mci_hw_reset,
1666         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1667         .execute_tuning         = dw_mci_execute_tuning,
1668         .card_busy              = dw_mci_card_busy,
1669         .start_signal_voltage_switch = dw_mci_switch_voltage,
1670         .init_card              = dw_mci_init_card,
1671         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1672 };
1673 
1674 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1675         __releases(&host->lock)
1676         __acquires(&host->lock)
1677 {
1678         struct dw_mci_slot *slot;
1679         struct mmc_host *prev_mmc = host->cur_slot->mmc;
1680 
1681         WARN_ON(host->cmd || host->data);
1682 
1683         host->cur_slot->mrq = NULL;
1684         host->mrq = NULL;
1685         if (!list_empty(&host->queue)) {
1686                 slot = list_entry(host->queue.next,
1687                                   struct dw_mci_slot, queue_node);
1688                 list_del(&slot->queue_node);
1689                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1690                          mmc_hostname(slot->mmc));
1691                 host->state = STATE_SENDING_CMD;
1692                 dw_mci_start_request(host, slot);
1693         } else {
1694                 dev_vdbg(host->dev, "list empty\n");
1695 
1696                 if (host->state == STATE_SENDING_CMD11)
1697                         host->state = STATE_WAITING_CMD11_DONE;
1698                 else
1699                         host->state = STATE_IDLE;
1700         }
1701 
1702         spin_unlock(&host->lock);
1703         mmc_request_done(prev_mmc, mrq);
1704         spin_lock(&host->lock);
1705 }
1706 
1707 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1708 {
1709         u32 status = host->cmd_status;
1710 
1711         host->cmd_status = 0;
1712 
1713         /* Read the response from the card (up to 16 bytes) */
1714         if (cmd->flags & MMC_RSP_PRESENT) {
1715                 if (cmd->flags & MMC_RSP_136) {
1716                         cmd->resp[3] = mci_readl(host, RESP0);
1717                         cmd->resp[2] = mci_readl(host, RESP1);
1718                         cmd->resp[1] = mci_readl(host, RESP2);
1719                         cmd->resp[0] = mci_readl(host, RESP3);
1720                 } else {
1721                         cmd->resp[0] = mci_readl(host, RESP0);
1722                         cmd->resp[1] = 0;
1723                         cmd->resp[2] = 0;
1724                         cmd->resp[3] = 0;
1725                 }
1726         }
1727 
1728         if (status & SDMMC_INT_RTO)
1729                 cmd->error = -ETIMEDOUT;
1730         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1731                 cmd->error = -EILSEQ;
1732         else if (status & SDMMC_INT_RESP_ERR)
1733                 cmd->error = -EIO;
1734         else
1735                 cmd->error = 0;
1736 
1737         return cmd->error;
1738 }
1739 
1740 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1741 {
1742         u32 status = host->data_status;
1743 
1744         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1745                 if (status & SDMMC_INT_DRTO) {
1746                         data->error = -ETIMEDOUT;
1747                 } else if (status & SDMMC_INT_DCRC) {
1748                         data->error = -EILSEQ;
1749                 } else if (status & SDMMC_INT_EBE) {
1750                         if (host->dir_status ==
1751                                 DW_MCI_SEND_STATUS) {
1752                                 /*
1753                                  * No data CRC status was returned.
1754                                  * The number of bytes transferred
1755                                  * will be exaggerated in PIO mode.
1756                                  */
1757                                 data->bytes_xfered = 0;
1758                                 data->error = -ETIMEDOUT;
1759                         } else if (host->dir_status ==
1760                                         DW_MCI_RECV_STATUS) {
1761                                 data->error = -EILSEQ;
1762                         }
1763                 } else {
1764                         /* SDMMC_INT_SBE is included */
1765                         data->error = -EILSEQ;
1766                 }
1767 
1768                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1769 
1770                 /*
1771                  * After an error, there may be data lingering
1772                  * in the FIFO
1773                  */
1774                 dw_mci_reset(host);
1775         } else {
1776                 data->bytes_xfered = data->blocks * data->blksz;
1777                 data->error = 0;
1778         }
1779 
1780         return data->error;
1781 }
1782 
1783 static void dw_mci_set_drto(struct dw_mci *host)
1784 {
1785         unsigned int drto_clks;
1786         unsigned int drto_ms;
1787 
1788         drto_clks = mci_readl(host, TMOUT) >> 8;
1789         drto_ms = DIV_ROUND_UP(drto_clks, host->bus_hz / 1000);
1790 
1791         /* add a bit spare time */
1792         drto_ms += 10;
1793 
1794         mod_timer(&host->dto_timer, jiffies + msecs_to_jiffies(drto_ms));
1795 }
1796 
1797 static void dw_mci_tasklet_func(unsigned long priv)
1798 {
1799         struct dw_mci *host = (struct dw_mci *)priv;
1800         struct mmc_data *data;
1801         struct mmc_command *cmd;
1802         struct mmc_request *mrq;
1803         enum dw_mci_state state;
1804         enum dw_mci_state prev_state;
1805         unsigned int err;
1806 
1807         spin_lock(&host->lock);
1808 
1809         state = host->state;
1810         data = host->data;
1811         mrq = host->mrq;
1812 
1813         do {
1814                 prev_state = state;
1815 
1816                 switch (state) {
1817                 case STATE_IDLE:
1818                 case STATE_WAITING_CMD11_DONE:
1819                         break;
1820 
1821                 case STATE_SENDING_CMD11:
1822                 case STATE_SENDING_CMD:
1823                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1824                                                 &host->pending_events))
1825                                 break;
1826 
1827                         cmd = host->cmd;
1828                         host->cmd = NULL;
1829                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1830                         err = dw_mci_command_complete(host, cmd);
1831                         if (cmd == mrq->sbc && !err) {
1832                                 prev_state = state = STATE_SENDING_CMD;
1833                                 __dw_mci_start_request(host, host->cur_slot,
1834                                                        mrq->cmd);
1835                                 goto unlock;
1836                         }
1837 
1838                         if (cmd->data && err) {
1839                                 /*
1840                                  * During UHS tuning sequence, sending the stop
1841                                  * command after the response CRC error would
1842                                  * throw the system into a confused state
1843                                  * causing all future tuning phases to report
1844                                  * failure.
1845                                  *
1846                                  * In such case controller will move into a data
1847                                  * transfer state after a response error or
1848                                  * response CRC error. Let's let that finish
1849                                  * before trying to send a stop, so we'll go to
1850                                  * STATE_SENDING_DATA.
1851                                  *
1852                                  * Although letting the data transfer take place
1853                                  * will waste a bit of time (we already know
1854                                  * the command was bad), it can't cause any
1855                                  * errors since it's possible it would have
1856                                  * taken place anyway if this tasklet got
1857                                  * delayed. Allowing the transfer to take place
1858                                  * avoids races and keeps things simple.
1859                                  */
1860                                 if ((err != -ETIMEDOUT) &&
1861                                     (cmd->opcode == MMC_SEND_TUNING_BLOCK)) {
1862                                         state = STATE_SENDING_DATA;
1863                                         continue;
1864                                 }
1865 
1866                                 dw_mci_stop_dma(host);
1867                                 send_stop_abort(host, data);
1868                                 state = STATE_SENDING_STOP;
1869                                 break;
1870                         }
1871 
1872                         if (!cmd->data || err) {
1873                                 dw_mci_request_end(host, mrq);
1874                                 goto unlock;
1875                         }
1876 
1877                         prev_state = state = STATE_SENDING_DATA;
1878                         /* fall through */
1879 
1880                 case STATE_SENDING_DATA:
1881                         /*
1882                          * We could get a data error and never a transfer
1883                          * complete so we'd better check for it here.
1884                          *
1885                          * Note that we don't really care if we also got a
1886                          * transfer complete; stopping the DMA and sending an
1887                          * abort won't hurt.
1888                          */
1889                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1890                                                &host->pending_events)) {
1891                                 dw_mci_stop_dma(host);
1892                                 if (data->stop ||
1893                                     !(host->data_status & (SDMMC_INT_DRTO |
1894                                                            SDMMC_INT_EBE)))
1895                                         send_stop_abort(host, data);
1896                                 state = STATE_DATA_ERROR;
1897                                 break;
1898                         }
1899 
1900                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1901                                                 &host->pending_events)) {
1902                                 /*
1903                                  * If all data-related interrupts don't come
1904                                  * within the given time in reading data state.
1905                                  */
1906                                 if (host->dir_status == DW_MCI_RECV_STATUS)
1907                                         dw_mci_set_drto(host);
1908                                 break;
1909                         }
1910 
1911                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1912 
1913                         /*
1914                          * Handle an EVENT_DATA_ERROR that might have shown up
1915                          * before the transfer completed.  This might not have
1916                          * been caught by the check above because the interrupt
1917                          * could have gone off between the previous check and
1918                          * the check for transfer complete.
1919                          *
1920                          * Technically this ought not be needed assuming we
1921                          * get a DATA_COMPLETE eventually (we'll notice the
1922                          * error and end the request), but it shouldn't hurt.
1923                          *
1924                          * This has the advantage of sending the stop command.
1925                          */
1926                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1927                                                &host->pending_events)) {
1928                                 dw_mci_stop_dma(host);
1929                                 if (data->stop ||
1930                                     !(host->data_status & (SDMMC_INT_DRTO |
1931                                                            SDMMC_INT_EBE)))
1932                                         send_stop_abort(host, data);
1933                                 state = STATE_DATA_ERROR;
1934                                 break;
1935                         }
1936                         prev_state = state = STATE_DATA_BUSY;
1937 
1938                         /* fall through */
1939 
1940                 case STATE_DATA_BUSY:
1941                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1942                                                 &host->pending_events)) {
1943                                 /*
1944                                  * If data error interrupt comes but data over
1945                                  * interrupt doesn't come within the given time.
1946                                  * in reading data state.
1947                                  */
1948                                 if (host->dir_status == DW_MCI_RECV_STATUS)
1949                                         dw_mci_set_drto(host);
1950                                 break;
1951                         }
1952 
1953                         host->data = NULL;
1954                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1955                         err = dw_mci_data_complete(host, data);
1956 
1957                         if (!err) {
1958                                 if (!data->stop || mrq->sbc) {
1959                                         if (mrq->sbc && data->stop)
1960                                                 data->stop->error = 0;
1961                                         dw_mci_request_end(host, mrq);
1962                                         goto unlock;
1963                                 }
1964 
1965                                 /* stop command for open-ended transfer*/
1966                                 if (data->stop)
1967                                         send_stop_abort(host, data);
1968                         } else {
1969                                 /*
1970                                  * If we don't have a command complete now we'll
1971                                  * never get one since we just reset everything;
1972                                  * better end the request.
1973                                  *
1974                                  * If we do have a command complete we'll fall
1975                                  * through to the SENDING_STOP command and
1976                                  * everything will be peachy keen.
1977                                  */
1978                                 if (!test_bit(EVENT_CMD_COMPLETE,
1979                                               &host->pending_events)) {
1980                                         host->cmd = NULL;
1981                                         dw_mci_request_end(host, mrq);
1982                                         goto unlock;
1983                                 }
1984                         }
1985 
1986                         /*
1987                          * If err has non-zero,
1988                          * stop-abort command has been already issued.
1989                          */
1990                         prev_state = state = STATE_SENDING_STOP;
1991 
1992                         /* fall through */
1993 
1994                 case STATE_SENDING_STOP:
1995                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1996                                                 &host->pending_events))
1997                                 break;
1998 
1999                         /* CMD error in data command */
2000                         if (mrq->cmd->error && mrq->data)
2001                                 dw_mci_reset(host);
2002 
2003                         host->cmd = NULL;
2004                         host->data = NULL;
2005 
2006                         if (mrq->stop)
2007                                 dw_mci_command_complete(host, mrq->stop);
2008                         else
2009                                 host->cmd_status = 0;
2010 
2011                         dw_mci_request_end(host, mrq);
2012                         goto unlock;
2013 
2014                 case STATE_DATA_ERROR:
2015                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
2016                                                 &host->pending_events))
2017                                 break;
2018 
2019                         state = STATE_DATA_BUSY;
2020                         break;
2021                 }
2022         } while (state != prev_state);
2023 
2024         host->state = state;
2025 unlock:
2026         spin_unlock(&host->lock);
2027 
2028 }
2029 
2030 /* push final bytes to part_buf, only use during push */
2031 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
2032 {
2033         memcpy((void *)&host->part_buf, buf, cnt);
2034         host->part_buf_count = cnt;
2035 }
2036 
2037 /* append bytes to part_buf, only use during push */
2038 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
2039 {
2040         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
2041         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
2042         host->part_buf_count += cnt;
2043         return cnt;
2044 }
2045 
2046 /* pull first bytes from part_buf, only use during pull */
2047 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
2048 {
2049         cnt = min_t(int, cnt, host->part_buf_count);
2050         if (cnt) {
2051                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
2052                        cnt);
2053                 host->part_buf_count -= cnt;
2054                 host->part_buf_start += cnt;
2055         }
2056         return cnt;
2057 }
2058 
2059 /* pull final bytes from the part_buf, assuming it's just been filled */
2060 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
2061 {
2062         memcpy(buf, &host->part_buf, cnt);
2063         host->part_buf_start = cnt;
2064         host->part_buf_count = (1 << host->data_shift) - cnt;
2065 }
2066 
2067 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
2068 {
2069         struct mmc_data *data = host->data;
2070         int init_cnt = cnt;
2071 
2072         /* try and push anything in the part_buf */
2073         if (unlikely(host->part_buf_count)) {
2074                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2075 
2076                 buf += len;
2077                 cnt -= len;
2078                 if (host->part_buf_count == 2) {
2079                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2080                         host->part_buf_count = 0;
2081                 }
2082         }
2083 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2084         if (unlikely((unsigned long)buf & 0x1)) {
2085                 while (cnt >= 2) {
2086                         u16 aligned_buf[64];
2087                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2088                         int items = len >> 1;
2089                         int i;
2090                         /* memcpy from input buffer into aligned buffer */
2091                         memcpy(aligned_buf, buf, len);
2092                         buf += len;
2093                         cnt -= len;
2094                         /* push data from aligned buffer into fifo */
2095                         for (i = 0; i < items; ++i)
2096                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
2097                 }
2098         } else
2099 #endif
2100         {
2101                 u16 *pdata = buf;
2102 
2103                 for (; cnt >= 2; cnt -= 2)
2104                         mci_fifo_writew(host->fifo_reg, *pdata++);
2105                 buf = pdata;
2106         }
2107         /* put anything remaining in the part_buf */
2108         if (cnt) {
2109                 dw_mci_set_part_bytes(host, buf, cnt);
2110                  /* Push data if we have reached the expected data length */
2111                 if ((data->bytes_xfered + init_cnt) ==
2112                     (data->blksz * data->blocks))
2113                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2114         }
2115 }
2116 
2117 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
2118 {
2119 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2120         if (unlikely((unsigned long)buf & 0x1)) {
2121                 while (cnt >= 2) {
2122                         /* pull data from fifo into aligned buffer */
2123                         u16 aligned_buf[64];
2124                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2125                         int items = len >> 1;
2126                         int i;
2127 
2128                         for (i = 0; i < items; ++i)
2129                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
2130                         /* memcpy from aligned buffer into output buffer */
2131                         memcpy(buf, aligned_buf, len);
2132                         buf += len;
2133                         cnt -= len;
2134                 }
2135         } else
2136 #endif
2137         {
2138                 u16 *pdata = buf;
2139 
2140                 for (; cnt >= 2; cnt -= 2)
2141                         *pdata++ = mci_fifo_readw(host->fifo_reg);
2142                 buf = pdata;
2143         }
2144         if (cnt) {
2145                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
2146                 dw_mci_pull_final_bytes(host, buf, cnt);
2147         }
2148 }
2149 
2150 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
2151 {
2152         struct mmc_data *data = host->data;
2153         int init_cnt = cnt;
2154 
2155         /* try and push anything in the part_buf */
2156         if (unlikely(host->part_buf_count)) {
2157                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2158 
2159                 buf += len;
2160                 cnt -= len;
2161                 if (host->part_buf_count == 4) {
2162                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2163                         host->part_buf_count = 0;
2164                 }
2165         }
2166 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2167         if (unlikely((unsigned long)buf & 0x3)) {
2168                 while (cnt >= 4) {
2169                         u32 aligned_buf[32];
2170                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2171                         int items = len >> 2;
2172                         int i;
2173                         /* memcpy from input buffer into aligned buffer */
2174                         memcpy(aligned_buf, buf, len);
2175                         buf += len;
2176                         cnt -= len;
2177                         /* push data from aligned buffer into fifo */
2178                         for (i = 0; i < items; ++i)
2179                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
2180                 }
2181         } else
2182 #endif
2183         {
2184                 u32 *pdata = buf;
2185 
2186                 for (; cnt >= 4; cnt -= 4)
2187                         mci_fifo_writel(host->fifo_reg, *pdata++);
2188                 buf = pdata;
2189         }
2190         /* put anything remaining in the part_buf */
2191         if (cnt) {
2192                 dw_mci_set_part_bytes(host, buf, cnt);
2193                  /* Push data if we have reached the expected data length */
2194                 if ((data->bytes_xfered + init_cnt) ==
2195                     (data->blksz * data->blocks))
2196                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2197         }
2198 }
2199 
2200 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
2201 {
2202 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2203         if (unlikely((unsigned long)buf & 0x3)) {
2204                 while (cnt >= 4) {
2205                         /* pull data from fifo into aligned buffer */
2206                         u32 aligned_buf[32];
2207                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2208                         int items = len >> 2;
2209                         int i;
2210 
2211                         for (i = 0; i < items; ++i)
2212                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
2213                         /* memcpy from aligned buffer into output buffer */
2214                         memcpy(buf, aligned_buf, len);
2215                         buf += len;
2216                         cnt -= len;
2217                 }
2218         } else
2219 #endif
2220         {
2221                 u32 *pdata = buf;
2222 
2223                 for (; cnt >= 4; cnt -= 4)
2224                         *pdata++ = mci_fifo_readl(host->fifo_reg);
2225                 buf = pdata;
2226         }
2227         if (cnt) {
2228                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
2229                 dw_mci_pull_final_bytes(host, buf, cnt);
2230         }
2231 }
2232 
2233 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
2234 {
2235         struct mmc_data *data = host->data;
2236         int init_cnt = cnt;
2237 
2238         /* try and push anything in the part_buf */
2239         if (unlikely(host->part_buf_count)) {
2240                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2241 
2242                 buf += len;
2243                 cnt -= len;
2244 
2245                 if (host->part_buf_count == 8) {
2246                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2247                         host->part_buf_count = 0;
2248                 }
2249         }
2250 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2251         if (unlikely((unsigned long)buf & 0x7)) {
2252                 while (cnt >= 8) {
2253                         u64 aligned_buf[16];
2254                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2255                         int items = len >> 3;
2256                         int i;
2257                         /* memcpy from input buffer into aligned buffer */
2258                         memcpy(aligned_buf, buf, len);
2259                         buf += len;
2260                         cnt -= len;
2261                         /* push data from aligned buffer into fifo */
2262                         for (i = 0; i < items; ++i)
2263                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
2264                 }
2265         } else
2266 #endif
2267         {
2268                 u64 *pdata = buf;
2269 
2270                 for (; cnt >= 8; cnt -= 8)
2271                         mci_fifo_writeq(host->fifo_reg, *pdata++);
2272                 buf = pdata;
2273         }
2274         /* put anything remaining in the part_buf */
2275         if (cnt) {
2276                 dw_mci_set_part_bytes(host, buf, cnt);
2277                 /* Push data if we have reached the expected data length */
2278                 if ((data->bytes_xfered + init_cnt) ==
2279                     (data->blksz * data->blocks))
2280                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2281         }
2282 }
2283 
2284 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
2285 {
2286 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2287         if (unlikely((unsigned long)buf & 0x7)) {
2288                 while (cnt >= 8) {
2289                         /* pull data from fifo into aligned buffer */
2290                         u64 aligned_buf[16];
2291                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2292                         int items = len >> 3;
2293                         int i;
2294 
2295                         for (i = 0; i < items; ++i)
2296                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
2297 
2298                         /* memcpy from aligned buffer into output buffer */
2299                         memcpy(buf, aligned_buf, len);
2300                         buf += len;
2301                         cnt -= len;
2302                 }
2303         } else
2304 #endif
2305         {
2306                 u64 *pdata = buf;
2307 
2308                 for (; cnt >= 8; cnt -= 8)
2309                         *pdata++ = mci_fifo_readq(host->fifo_reg);
2310                 buf = pdata;
2311         }
2312         if (cnt) {
2313                 host->part_buf = mci_fifo_readq(host->fifo_reg);
2314                 dw_mci_pull_final_bytes(host, buf, cnt);
2315         }
2316 }
2317 
2318 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2319 {
2320         int len;
2321 
2322         /* get remaining partial bytes */
2323         len = dw_mci_pull_part_bytes(host, buf, cnt);
2324         if (unlikely(len == cnt))
2325                 return;
2326         buf += len;
2327         cnt -= len;
2328 
2329         /* get the rest of the data */
2330         host->pull_data(host, buf, cnt);
2331 }
2332 
2333 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2334 {
2335         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2336         void *buf;
2337         unsigned int offset;
2338         struct mmc_data *data = host->data;
2339         int shift = host->data_shift;
2340         u32 status;
2341         unsigned int len;
2342         unsigned int remain, fcnt;
2343 
2344         do {
2345                 if (!sg_miter_next(sg_miter))
2346                         goto done;
2347 
2348                 host->sg = sg_miter->piter.sg;
2349                 buf = sg_miter->addr;
2350                 remain = sg_miter->length;
2351                 offset = 0;
2352 
2353                 do {
2354                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2355                                         << shift) + host->part_buf_count;
2356                         len = min(remain, fcnt);
2357                         if (!len)
2358                                 break;
2359                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2360                         data->bytes_xfered += len;
2361                         offset += len;
2362                         remain -= len;
2363                 } while (remain);
2364 
2365                 sg_miter->consumed = offset;
2366                 status = mci_readl(host, MINTSTS);
2367                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2368         /* if the RXDR is ready read again */
2369         } while ((status & SDMMC_INT_RXDR) ||
2370                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2371 
2372         if (!remain) {
2373                 if (!sg_miter_next(sg_miter))
2374                         goto done;
2375                 sg_miter->consumed = 0;
2376         }
2377         sg_miter_stop(sg_miter);
2378         return;
2379 
2380 done:
2381         sg_miter_stop(sg_miter);
2382         host->sg = NULL;
2383         smp_wmb(); /* drain writebuffer */
2384         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2385 }
2386 
2387 static void dw_mci_write_data_pio(struct dw_mci *host)
2388 {
2389         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2390         void *buf;
2391         unsigned int offset;
2392         struct mmc_data *data = host->data;
2393         int shift = host->data_shift;
2394         u32 status;
2395         unsigned int len;
2396         unsigned int fifo_depth = host->fifo_depth;
2397         unsigned int remain, fcnt;
2398 
2399         do {
2400                 if (!sg_miter_next(sg_miter))
2401                         goto done;
2402 
2403                 host->sg = sg_miter->piter.sg;
2404                 buf = sg_miter->addr;
2405                 remain = sg_miter->length;
2406                 offset = 0;
2407 
2408                 do {
2409                         fcnt = ((fifo_depth -
2410                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2411                                         << shift) - host->part_buf_count;
2412                         len = min(remain, fcnt);
2413                         if (!len)
2414                                 break;
2415                         host->push_data(host, (void *)(buf + offset), len);
2416                         data->bytes_xfered += len;
2417                         offset += len;
2418                         remain -= len;
2419                 } while (remain);
2420 
2421                 sg_miter->consumed = offset;
2422                 status = mci_readl(host, MINTSTS);
2423                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2424         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2425 
2426         if (!remain) {
2427                 if (!sg_miter_next(sg_miter))
2428                         goto done;
2429                 sg_miter->consumed = 0;
2430         }
2431         sg_miter_stop(sg_miter);
2432         return;
2433 
2434 done:
2435         sg_miter_stop(sg_miter);
2436         host->sg = NULL;
2437         smp_wmb(); /* drain writebuffer */
2438         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2439 }
2440 
2441 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2442 {
2443         if (!host->cmd_status)
2444                 host->cmd_status = status;
2445 
2446         smp_wmb(); /* drain writebuffer */
2447 
2448         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2449         tasklet_schedule(&host->tasklet);
2450 }
2451 
2452 static void dw_mci_handle_cd(struct dw_mci *host)
2453 {
2454         int i;
2455 
2456         for (i = 0; i < host->num_slots; i++) {
2457                 struct dw_mci_slot *slot = host->slot[i];
2458 
2459                 if (!slot)
2460                         continue;
2461 
2462                 if (slot->mmc->ops->card_event)
2463                         slot->mmc->ops->card_event(slot->mmc);
2464                 mmc_detect_change(slot->mmc,
2465                         msecs_to_jiffies(host->pdata->detect_delay_ms));
2466         }
2467 }
2468 
2469 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2470 {
2471         struct dw_mci *host = dev_id;
2472         u32 pending;
2473         int i;
2474 
2475         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2476 
2477         if (pending) {
2478                 /* Check volt switch first, since it can look like an error */
2479                 if ((host->state == STATE_SENDING_CMD11) &&
2480                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2481                         unsigned long irqflags;
2482 
2483                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2484                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2485 
2486                         /*
2487                          * Hold the lock; we know cmd11_timer can't be kicked
2488                          * off after the lock is released, so safe to delete.
2489                          */
2490                         spin_lock_irqsave(&host->irq_lock, irqflags);
2491                         dw_mci_cmd_interrupt(host, pending);
2492                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2493 
2494                         del_timer(&host->cmd11_timer);
2495                 }
2496 
2497                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2498                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2499                         host->cmd_status = pending;
2500                         smp_wmb(); /* drain writebuffer */
2501                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2502                 }
2503 
2504                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2505                         /* if there is an error report DATA_ERROR */
2506                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2507                         host->data_status = pending;
2508                         smp_wmb(); /* drain writebuffer */
2509                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2510                         tasklet_schedule(&host->tasklet);
2511                 }
2512 
2513                 if (pending & SDMMC_INT_DATA_OVER) {
2514                         del_timer(&host->dto_timer);
2515 
2516                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2517                         if (!host->data_status)
2518                                 host->data_status = pending;
2519                         smp_wmb(); /* drain writebuffer */
2520                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2521                                 if (host->sg != NULL)
2522                                         dw_mci_read_data_pio(host, true);
2523                         }
2524                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2525                         tasklet_schedule(&host->tasklet);
2526                 }
2527 
2528                 if (pending & SDMMC_INT_RXDR) {
2529                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2530                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2531                                 dw_mci_read_data_pio(host, false);
2532                 }
2533 
2534                 if (pending & SDMMC_INT_TXDR) {
2535                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2536                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2537                                 dw_mci_write_data_pio(host);
2538                 }
2539 
2540                 if (pending & SDMMC_INT_CMD_DONE) {
2541                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2542                         dw_mci_cmd_interrupt(host, pending);
2543                 }
2544 
2545                 if (pending & SDMMC_INT_CD) {
2546                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2547                         dw_mci_handle_cd(host);
2548                 }
2549 
2550                 /* Handle SDIO Interrupts */
2551                 for (i = 0; i < host->num_slots; i++) {
2552                         struct dw_mci_slot *slot = host->slot[i];
2553 
2554                         if (!slot)
2555                                 continue;
2556 
2557                         if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2558                                 mci_writel(host, RINTSTS,
2559                                            SDMMC_INT_SDIO(slot->sdio_id));
2560                                 mmc_signal_sdio_irq(slot->mmc);
2561                         }
2562                 }
2563 
2564         }
2565 
2566         if (host->use_dma != TRANS_MODE_IDMAC)
2567                 return IRQ_HANDLED;
2568 
2569         /* Handle IDMA interrupts */
2570         if (host->dma_64bit_address == 1) {
2571                 pending = mci_readl(host, IDSTS64);
2572                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2573                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2574                                                         SDMMC_IDMAC_INT_RI);
2575                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2576                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2577                                 host->dma_ops->complete((void *)host);
2578                 }
2579         } else {
2580                 pending = mci_readl(host, IDSTS);
2581                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2582                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2583                                                         SDMMC_IDMAC_INT_RI);
2584                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2585                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2586                                 host->dma_ops->complete((void *)host);
2587                 }
2588         }
2589 
2590         return IRQ_HANDLED;
2591 }
2592 
2593 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2594 {
2595         struct mmc_host *mmc;
2596         struct dw_mci_slot *slot;
2597         const struct dw_mci_drv_data *drv_data = host->drv_data;
2598         int ctrl_id, ret;
2599         u32 freq[2];
2600 
2601         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2602         if (!mmc)
2603                 return -ENOMEM;
2604 
2605         slot = mmc_priv(mmc);
2606         slot->id = id;
2607         slot->sdio_id = host->sdio_id0 + id;
2608         slot->mmc = mmc;
2609         slot->host = host;
2610         host->slot[id] = slot;
2611 
2612         mmc->ops = &dw_mci_ops;
2613         if (of_property_read_u32_array(host->dev->of_node,
2614                                        "clock-freq-min-max", freq, 2)) {
2615                 mmc->f_min = DW_MCI_FREQ_MIN;
2616                 mmc->f_max = DW_MCI_FREQ_MAX;
2617         } else {
2618                 mmc->f_min = freq[0];
2619                 mmc->f_max = freq[1];
2620         }
2621 
2622         /*if there are external regulators, get them*/
2623         ret = mmc_regulator_get_supply(mmc);
2624         if (ret == -EPROBE_DEFER)
2625                 goto err_host_allocated;
2626 
2627         if (!mmc->ocr_avail)
2628                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2629 
2630         if (host->pdata->caps)
2631                 mmc->caps = host->pdata->caps;
2632 
2633         /*
2634          * Support MMC_CAP_ERASE by default.
2635          * It needs to use trim/discard/erase commands.
2636          */
2637         mmc->caps |= MMC_CAP_ERASE;
2638 
2639         if (host->pdata->pm_caps)
2640                 mmc->pm_caps = host->pdata->pm_caps;
2641 
2642         if (host->dev->of_node) {
2643                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2644                 if (ctrl_id < 0)
2645                         ctrl_id = 0;
2646         } else {
2647                 ctrl_id = to_platform_device(host->dev)->id;
2648         }
2649         if (drv_data && drv_data->caps)
2650                 mmc->caps |= drv_data->caps[ctrl_id];
2651 
2652         if (host->pdata->caps2)
2653                 mmc->caps2 = host->pdata->caps2;
2654 
2655         ret = mmc_of_parse(mmc);
2656         if (ret)
2657                 goto err_host_allocated;
2658 
2659         /* Useful defaults if platform data is unset. */
2660         if (host->use_dma == TRANS_MODE_IDMAC) {
2661                 mmc->max_segs = host->ring_size;
2662                 mmc->max_blk_size = 65535;
2663                 mmc->max_seg_size = 0x1000;
2664                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2665                 mmc->max_blk_count = mmc->max_req_size / 512;
2666         } else if (host->use_dma == TRANS_MODE_EDMAC) {
2667                 mmc->max_segs = 64;
2668                 mmc->max_blk_size = 65535;
2669                 mmc->max_blk_count = 65535;
2670                 mmc->max_req_size =
2671                                 mmc->max_blk_size * mmc->max_blk_count;
2672                 mmc->max_seg_size = mmc->max_req_size;
2673         } else {
2674                 /* TRANS_MODE_PIO */
2675                 mmc->max_segs = 64;
2676                 mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */
2677                 mmc->max_blk_count = 512;
2678                 mmc->max_req_size = mmc->max_blk_size *
2679                                     mmc->max_blk_count;
2680                 mmc->max_seg_size = mmc->max_req_size;
2681         }
2682 
2683         dw_mci_get_cd(mmc);
2684 
2685         ret = mmc_add_host(mmc);
2686         if (ret)
2687                 goto err_host_allocated;
2688 
2689 #if defined(CONFIG_DEBUG_FS)
2690         dw_mci_init_debugfs(slot);
2691 #endif
2692 
2693         return 0;
2694 
2695 err_host_allocated:
2696         mmc_free_host(mmc);
2697         return ret;
2698 }
2699 
2700 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2701 {
2702         /* Debugfs stuff is cleaned up by mmc core */
2703         mmc_remove_host(slot->mmc);
2704         slot->host->slot[id] = NULL;
2705         mmc_free_host(slot->mmc);
2706 }
2707 
2708 static void dw_mci_init_dma(struct dw_mci *host)
2709 {
2710         int addr_config;
2711         struct device *dev = host->dev;
2712         struct device_node *np = dev->of_node;
2713 
2714         /*
2715         * Check tansfer mode from HCON[17:16]
2716         * Clear the ambiguous description of dw_mmc databook:
2717         * 2b'00: No DMA Interface -> Actually means using Internal DMA block
2718         * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block
2719         * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block
2720         * 2b'11: Non DW DMA Interface -> pio only
2721         * Compared to DesignWare DMA Interface, Generic DMA Interface has a
2722         * simpler request/acknowledge handshake mechanism and both of them
2723         * are regarded as external dma master for dw_mmc.
2724         */
2725         host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON));
2726         if (host->use_dma == DMA_INTERFACE_IDMA) {
2727                 host->use_dma = TRANS_MODE_IDMAC;
2728         } else if (host->use_dma == DMA_INTERFACE_DWDMA ||
2729                    host->use_dma == DMA_INTERFACE_GDMA) {
2730                 host->use_dma = TRANS_MODE_EDMAC;
2731         } else {
2732                 goto no_dma;
2733         }
2734 
2735         /* Determine which DMA interface to use */
2736         if (host->use_dma == TRANS_MODE_IDMAC) {
2737                 /*
2738                 * Check ADDR_CONFIG bit in HCON to find
2739                 * IDMAC address bus width
2740                 */
2741                 addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON));
2742 
2743                 if (addr_config == 1) {
2744                         /* host supports IDMAC in 64-bit address mode */
2745                         host->dma_64bit_address = 1;
2746                         dev_info(host->dev,
2747                                  "IDMAC supports 64-bit address mode.\n");
2748                         if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2749                                 dma_set_coherent_mask(host->dev,
2750                                                       DMA_BIT_MASK(64));
2751                 } else {
2752                         /* host supports IDMAC in 32-bit address mode */
2753                         host->dma_64bit_address = 0;
2754                         dev_info(host->dev,
2755                                  "IDMAC supports 32-bit address mode.\n");
2756                 }
2757 
2758                 /* Alloc memory for sg translation */
2759                 host->sg_cpu = dmam_alloc_coherent(host->dev,
2760                                                    DESC_RING_BUF_SZ,
2761                                                    &host->sg_dma, GFP_KERNEL);
2762                 if (!host->sg_cpu) {
2763                         dev_err(host->dev,
2764                                 "%s: could not alloc DMA memory\n",
2765                                 __func__);
2766                         goto no_dma;
2767                 }
2768 
2769                 host->dma_ops = &dw_mci_idmac_ops;
2770                 dev_info(host->dev, "Using internal DMA controller.\n");
2771         } else {
2772                 /* TRANS_MODE_EDMAC: check dma bindings again */
2773                 if ((of_property_count_strings(np, "dma-names") < 0) ||
2774                     (!of_find_property(np, "dmas", NULL))) {
2775                         goto no_dma;
2776                 }
2777                 host->dma_ops = &dw_mci_edmac_ops;
2778                 dev_info(host->dev, "Using external DMA controller.\n");
2779         }
2780 
2781         if (host->dma_ops->init && host->dma_ops->start &&
2782             host->dma_ops->stop && host->dma_ops->cleanup) {
2783                 if (host->dma_ops->init(host)) {
2784                         dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n",
2785                                 __func__);
2786                         goto no_dma;
2787                 }
2788         } else {
2789                 dev_err(host->dev, "DMA initialization not found.\n");
2790                 goto no_dma;
2791         }
2792 
2793         return;
2794 
2795 no_dma:
2796         dev_info(host->dev, "Using PIO mode.\n");
2797         host->use_dma = TRANS_MODE_PIO;
2798 }
2799 
2800 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2801 {
2802         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2803         u32 ctrl;
2804 
2805         ctrl = mci_readl(host, CTRL);
2806         ctrl |= reset;
2807         mci_writel(host, CTRL, ctrl);
2808 
2809         /* wait till resets clear */
2810         do {
2811                 ctrl = mci_readl(host, CTRL);
2812                 if (!(ctrl & reset))
2813                         return true;
2814         } while (time_before(jiffies, timeout));
2815 
2816         dev_err(host->dev,
2817                 "Timeout resetting block (ctrl reset %#x)\n",
2818                 ctrl & reset);
2819 
2820         return false;
2821 }
2822 
2823 static bool dw_mci_reset(struct dw_mci *host)
2824 {
2825         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2826         bool ret = false;
2827 
2828         /*
2829          * Reseting generates a block interrupt, hence setting
2830          * the scatter-gather pointer to NULL.
2831          */
2832         if (host->sg) {
2833                 sg_miter_stop(&host->sg_miter);
2834                 host->sg = NULL;
2835         }
2836 
2837         if (host->use_dma)
2838                 flags |= SDMMC_CTRL_DMA_RESET;
2839 
2840         if (dw_mci_ctrl_reset(host, flags)) {
2841                 /*
2842                  * In all cases we clear the RAWINTS register to clear any
2843                  * interrupts.
2844                  */
2845                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2846 
2847                 /* if using dma we wait for dma_req to clear */
2848                 if (host->use_dma) {
2849                         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2850                         u32 status;
2851 
2852                         do {
2853                                 status = mci_readl(host, STATUS);
2854                                 if (!(status & SDMMC_STATUS_DMA_REQ))
2855                                         break;
2856                                 cpu_relax();
2857                         } while (time_before(jiffies, timeout));
2858 
2859                         if (status & SDMMC_STATUS_DMA_REQ) {
2860                                 dev_err(host->dev,
2861                                         "%s: Timeout waiting for dma_req to clear during reset\n",
2862                                         __func__);
2863                                 goto ciu_out;
2864                         }
2865 
2866                         /* when using DMA next we reset the fifo again */
2867                         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2868                                 goto ciu_out;
2869                 }
2870         } else {
2871                 /* if the controller reset bit did clear, then set clock regs */
2872                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2873                         dev_err(host->dev,
2874                                 "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n",
2875                                 __func__);
2876                         goto ciu_out;
2877                 }
2878         }
2879 
2880         if (host->use_dma == TRANS_MODE_IDMAC)
2881                 /* It is also recommended that we reset and reprogram idmac */
2882                 dw_mci_idmac_reset(host);
2883 
2884         ret = true;
2885 
2886 ciu_out:
2887         /* After a CTRL reset we need to have CIU set clock registers  */
2888         mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2889 
2890         return ret;
2891 }
2892 
2893 static void dw_mci_cmd11_timer(unsigned long arg)
2894 {
2895         struct dw_mci *host = (struct dw_mci *)arg;
2896 
2897         if (host->state != STATE_SENDING_CMD11) {
2898                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
2899                 return;
2900         }
2901 
2902         host->cmd_status = SDMMC_INT_RTO;
2903         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2904         tasklet_schedule(&host->tasklet);
2905 }
2906 
2907 static void dw_mci_dto_timer(unsigned long arg)
2908 {
2909         struct dw_mci *host = (struct dw_mci *)arg;
2910 
2911         switch (host->state) {
2912         case STATE_SENDING_DATA:
2913         case STATE_DATA_BUSY:
2914                 /*
2915                  * If DTO interrupt does NOT come in sending data state,
2916                  * we should notify the driver to terminate current transfer
2917                  * and report a data timeout to the core.
2918                  */
2919                 host->data_status = SDMMC_INT_DRTO;
2920                 set_bit(EVENT_DATA_ERROR, &host->pending_events);
2921                 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2922                 tasklet_schedule(&host->tasklet);
2923                 break;
2924         default:
2925                 break;
2926         }
2927 }
2928 
2929 #ifdef CONFIG_OF
2930 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2931 {
2932         struct dw_mci_board *pdata;
2933         struct device *dev = host->dev;
2934         struct device_node *np = dev->of_node;
2935         const struct dw_mci_drv_data *drv_data = host->drv_data;
2936         int ret;
2937         u32 clock_frequency;
2938 
2939         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2940         if (!pdata)
2941                 return ERR_PTR(-ENOMEM);
2942 
2943         /* find reset controller when exist */
2944         pdata->rstc = devm_reset_control_get_optional(dev, "reset");
2945         if (IS_ERR(pdata->rstc)) {
2946                 if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
2947                         return ERR_PTR(-EPROBE_DEFER);
2948         }
2949 
2950         /* find out number of slots supported */
2951         of_property_read_u32(np, "num-slots", &pdata->num_slots);
2952 
2953         if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2954                 dev_info(dev,
2955                          "fifo-depth property not found, using value of FIFOTH register as default\n");
2956 
2957         of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2958 
2959         if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2960                 pdata->bus_hz = clock_frequency;
2961 
2962         if (drv_data && drv_data->parse_dt) {
2963                 ret = drv_data->parse_dt(host);
2964                 if (ret)
2965                         return ERR_PTR(ret);
2966         }
2967 
2968         return pdata;
2969 }
2970 
2971 #else /* CONFIG_OF */
2972 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2973 {
2974         return ERR_PTR(-EINVAL);
2975 }
2976 #endif /* CONFIG_OF */
2977 
2978 static void dw_mci_enable_cd(struct dw_mci *host)
2979 {
2980         unsigned long irqflags;
2981         u32 temp;
2982         int i;
2983         struct dw_mci_slot *slot;
2984 
2985         /*
2986          * No need for CD if all slots have a non-error GPIO
2987          * as well as broken card detection is found.
2988          */
2989         for (i = 0; i < host->num_slots; i++) {
2990                 slot = host->slot[i];
2991                 if (slot->mmc->caps & MMC_CAP_NEEDS_POLL)
2992                         return;
2993 
2994                 if (mmc_gpio_get_cd(slot->mmc) < 0)
2995                         break;
2996         }
2997         if (i == host->num_slots)
2998                 return;
2999 
3000         spin_lock_irqsave(&host->irq_lock, irqflags);
3001         temp = mci_readl(host, INTMASK);
3002         temp  |= SDMMC_INT_CD;
3003         mci_writel(host, INTMASK, temp);
3004         spin_unlock_irqrestore(&host->irq_lock, irqflags);
3005 }
3006 
3007 int dw_mci_probe(struct dw_mci *host)
3008 {
3009         const struct dw_mci_drv_data *drv_data = host->drv_data;
3010         int width, i, ret = 0;
3011         u32 fifo_size;
3012         int init_slots = 0;
3013 
3014         if (!host->pdata) {
3015                 host->pdata = dw_mci_parse_dt(host);
3016                 if (PTR_ERR(host->pdata) == -EPROBE_DEFER) {
3017                         return -EPROBE_DEFER;
3018                 } else if (IS_ERR(host->pdata)) {
3019                         dev_err(host->dev, "platform data not available\n");
3020                         return -EINVAL;
3021                 }
3022         }
3023 
3024         host->biu_clk = devm_clk_get(host->dev, "biu");
3025         if (IS_ERR(host->biu_clk)) {
3026                 dev_dbg(host->dev, "biu clock not available\n");
3027         } else {
3028                 ret = clk_prepare_enable(host->biu_clk);
3029                 if (ret) {
3030                         dev_err(host->dev, "failed to enable biu clock\n");
3031                         return ret;
3032                 }
3033         }
3034 
3035         host->ciu_clk = devm_clk_get(host->dev, "ciu");
3036         if (IS_ERR(host->ciu_clk)) {
3037                 dev_dbg(host->dev, "ciu clock not available\n");
3038                 host->bus_hz = host->pdata->bus_hz;
3039         } else {
3040                 ret = clk_prepare_enable(host->ciu_clk);
3041                 if (ret) {
3042                         dev_err(host->dev, "failed to enable ciu clock\n");
3043                         goto err_clk_biu;
3044                 }
3045 
3046                 if (host->pdata->bus_hz) {
3047                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
3048                         if (ret)
3049                                 dev_warn(host->dev,
3050                                          "Unable to set bus rate to %uHz\n",
3051                                          host->pdata->bus_hz);
3052                 }
3053                 host->bus_hz = clk_get_rate(host->ciu_clk);
3054         }
3055 
3056         if (!host->bus_hz) {
3057                 dev_err(host->dev,
3058                         "Platform data must supply bus speed\n");
3059                 ret = -ENODEV;
3060                 goto err_clk_ciu;
3061         }
3062 
3063         if (drv_data && drv_data->init) {
3064                 ret = drv_data->init(host);
3065                 if (ret) {
3066                         dev_err(host->dev,
3067                                 "implementation specific init failed\n");
3068                         goto err_clk_ciu;
3069                 }
3070         }
3071 
3072         if (!IS_ERR(host->pdata->rstc)) {
3073                 reset_control_assert(host->pdata->rstc);
3074                 usleep_range(10, 50);
3075                 reset_control_deassert(host->pdata->rstc);
3076         }
3077 
3078         setup_timer(&host->cmd11_timer,
3079                     dw_mci_cmd11_timer, (unsigned long)host);
3080 
3081         setup_timer(&host->dto_timer,
3082                     dw_mci_dto_timer, (unsigned long)host);
3083 
3084         spin_lock_init(&host->lock);
3085         spin_lock_init(&host->irq_lock);
3086         INIT_LIST_HEAD(&host->queue);
3087 
3088         /*
3089          * Get the host data width - this assumes that HCON has been set with
3090          * the correct values.
3091          */
3092         i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON));
3093         if (!i) {
3094                 host->push_data = dw_mci_push_data16;
3095                 host->pull_data = dw_mci_pull_data16;
3096                 width = 16;
3097                 host->data_shift = 1;
3098         } else if (i == 2) {
3099                 host->push_data = dw_mci_push_data64;
3100                 host->pull_data = dw_mci_pull_data64;
3101                 width = 64;
3102                 host->data_shift = 3;
3103         } else {
3104                 /* Check for a reserved value, and warn if it is */
3105                 WARN((i != 1),
3106                      "HCON reports a reserved host data width!\n"
3107                      "Defaulting to 32-bit access.\n");
3108                 host->push_data = dw_mci_push_data32;
3109                 host->pull_data = dw_mci_pull_data32;
3110                 width = 32;
3111                 host->data_shift = 2;
3112         }
3113 
3114         /* Reset all blocks */
3115         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3116                 ret = -ENODEV;
3117                 goto err_clk_ciu;
3118         }
3119 
3120         host->dma_ops = host->pdata->dma_ops;
3121         dw_mci_init_dma(host);
3122 
3123         /* Clear the interrupts for the host controller */
3124         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3125         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3126 
3127         /* Put in max timeout */
3128         mci_writel(host, TMOUT, 0xFFFFFFFF);
3129 
3130         /*
3131          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
3132          *                          Tx Mark = fifo_size / 2 DMA Size = 8
3133          */
3134         if (!host->pdata->fifo_depth) {
3135                 /*
3136                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
3137                  * have been overwritten by the bootloader, just like we're
3138                  * about to do, so if you know the value for your hardware, you
3139                  * should put it in the platform data.
3140                  */
3141                 fifo_size = mci_readl(host, FIFOTH);
3142                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
3143         } else {
3144                 fifo_size = host->pdata->fifo_depth;
3145         }
3146         host->fifo_depth = fifo_size;
3147         host->fifoth_val =
3148                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
3149         mci_writel(host, FIFOTH, host->fifoth_val);
3150 
3151         /* disable clock to CIU */
3152         mci_writel(host, CLKENA, 0);
3153         mci_writel(host, CLKSRC, 0);
3154 
3155         /*
3156          * In 2.40a spec, Data offset is changed.
3157          * Need to check the version-id and set data-offset for DATA register.
3158          */
3159         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
3160         dev_info(host->dev, "Version ID is %04x\n", host->verid);
3161 
3162         if (host->verid < DW_MMC_240A)
3163                 host->fifo_reg = host->regs + DATA_OFFSET;
3164         else
3165                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
3166 
3167         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
3168         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
3169                                host->irq_flags, "dw-mci", host);
3170         if (ret)
3171                 goto err_dmaunmap;
3172 
3173         if (host->pdata->num_slots)
3174                 host->num_slots = host->pdata->num_slots;
3175         else
3176                 host->num_slots = 1;
3177 
3178         if (host->num_slots < 1 ||
3179             host->num_slots > SDMMC_GET_SLOT_NUM(mci_readl(host, HCON))) {
3180                 dev_err(host->dev,
3181                         "Platform data must supply correct num_slots.\n");
3182                 ret = -ENODEV;
3183                 goto err_clk_ciu;
3184         }
3185 
3186         /*
3187          * Enable interrupts for command done, data over, data empty,
3188          * receive ready and error such as transmit, receive timeout, crc error
3189          */
3190         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3191                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3192                    DW_MCI_ERROR_FLAGS);
3193         /* Enable mci interrupt */
3194         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3195 
3196         dev_info(host->dev,
3197                  "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n",
3198                  host->irq, width, fifo_size);
3199 
3200         /* We need at least one slot to succeed */
3201         for (i = 0; i < host->num_slots; i++) {
3202                 ret = dw_mci_init_slot(host, i);
3203                 if (ret)
3204                         dev_dbg(host->dev, "slot %d init failed\n", i);
3205                 else
3206                         init_slots++;
3207         }
3208 
3209         if (init_slots) {
3210                 dev_info(host->dev, "%d slots initialized\n", init_slots);
3211         } else {
3212                 dev_dbg(host->dev,
3213                         "attempted to initialize %d slots, but failed on all\n",
3214                         host->num_slots);
3215                 goto err_dmaunmap;
3216         }
3217 
3218         /* Now that slots are all setup, we can enable card detect */
3219         dw_mci_enable_cd(host);
3220 
3221         return 0;
3222 
3223 err_dmaunmap:
3224         if (host->use_dma && host->dma_ops->exit)
3225                 host->dma_ops->exit(host);
3226 
3227         if (!IS_ERR(host->pdata->rstc))
3228                 reset_control_assert(host->pdata->rstc);
3229 
3230 err_clk_ciu:
3231         clk_disable_unprepare(host->ciu_clk);
3232 
3233 err_clk_biu:
3234         clk_disable_unprepare(host->biu_clk);
3235 
3236         return ret;
3237 }
3238 EXPORT_SYMBOL(dw_mci_probe);
3239 
3240 void dw_mci_remove(struct dw_mci *host)
3241 {
3242         int i;
3243 
3244         for (i = 0; i < host->num_slots; i++) {
3245                 dev_dbg(host->dev, "remove slot %d\n", i);
3246                 if (host->slot[i])
3247                         dw_mci_cleanup_slot(host->slot[i], i);
3248         }
3249 
3250         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3251         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3252 
3253         /* disable clock to CIU */
3254         mci_writel(host, CLKENA, 0);
3255         mci_writel(host, CLKSRC, 0);
3256 
3257         if (host->use_dma && host->dma_ops->exit)
3258                 host->dma_ops->exit(host);
3259 
3260         if (!IS_ERR(host->pdata->rstc))
3261                 reset_control_assert(host->pdata->rstc);
3262 
3263         clk_disable_unprepare(host->ciu_clk);
3264         clk_disable_unprepare(host->biu_clk);
3265 }
3266 EXPORT_SYMBOL(dw_mci_remove);
3267 
3268 
3269 
3270 #ifdef CONFIG_PM_SLEEP
3271 /*
3272  * TODO: we should probably disable the clock to the card in the suspend path.
3273  */
3274 int dw_mci_suspend(struct dw_mci *host)
3275 {
3276         if (host->use_dma && host->dma_ops->exit)
3277                 host->dma_ops->exit(host);
3278 
3279         return 0;
3280 }
3281 EXPORT_SYMBOL(dw_mci_suspend);
3282 
3283 int dw_mci_resume(struct dw_mci *host)
3284 {
3285         int i, ret;
3286 
3287         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3288                 ret = -ENODEV;
3289                 return ret;
3290         }
3291 
3292         if (host->use_dma && host->dma_ops->init)
3293                 host->dma_ops->init(host);
3294 
3295         /*
3296          * Restore the initial value at FIFOTH register
3297          * And Invalidate the prev_blksz with zero
3298          */
3299         mci_writel(host, FIFOTH, host->fifoth_val);
3300         host->prev_blksz = 0;
3301 
3302         /* Put in max timeout */
3303         mci_writel(host, TMOUT, 0xFFFFFFFF);
3304 
3305         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3306         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3307                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3308                    DW_MCI_ERROR_FLAGS);
3309         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3310 
3311         for (i = 0; i < host->num_slots; i++) {
3312                 struct dw_mci_slot *slot = host->slot[i];
3313 
3314                 if (!slot)
3315                         continue;
3316                 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
3317                         dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
3318                         dw_mci_setup_bus(slot, true);
3319                 }
3320         }
3321 
3322         /* Now that slots are all setup, we can enable card detect */
3323         dw_mci_enable_cd(host);
3324 
3325         return 0;
3326 }
3327 EXPORT_SYMBOL(dw_mci_resume);
3328 #endif /* CONFIG_PM_SLEEP */
3329 
3330 static int __init dw_mci_init(void)
3331 {
3332         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3333         return 0;
3334 }
3335 
3336 static void __exit dw_mci_exit(void)
3337 {
3338 }
3339 
3340 module_init(dw_mci_init);
3341 module_exit(dw_mci_exit);
3342 
3343 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3344 MODULE_AUTHOR("NXP Semiconductor VietNam");
3345 MODULE_AUTHOR("Imagination Technologies Ltd");
3346 MODULE_LICENSE("GPL v2");
3347 

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