Version:  2.0.40 2.2.26 2.4.37 3.11 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

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 struct idmac_desc_64addr {
 65         u32             des0;   /* Control Descriptor */
 66 
 67         u32             des1;   /* Reserved */
 68 
 69         u32             des2;   /*Buffer sizes */
 70 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
 71         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
 72          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
 73 
 74         u32             des3;   /* Reserved */
 75 
 76         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
 77         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
 78 
 79         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
 80         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
 81 };
 82 
 83 struct idmac_desc {
 84         __le32          des0;   /* Control Descriptor */
 85 #define IDMAC_DES0_DIC  BIT(1)
 86 #define IDMAC_DES0_LD   BIT(2)
 87 #define IDMAC_DES0_FD   BIT(3)
 88 #define IDMAC_DES0_CH   BIT(4)
 89 #define IDMAC_DES0_ER   BIT(5)
 90 #define IDMAC_DES0_CES  BIT(30)
 91 #define IDMAC_DES0_OWN  BIT(31)
 92 
 93         __le32          des1;   /* Buffer sizes */
 94 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 95         ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff)))
 96 
 97         __le32          des2;   /* buffer 1 physical address */
 98 
 99         __le32          des3;   /* buffer 2 physical address */
100 };
101 
102 /* Each descriptor can transfer up to 4KB of data in chained mode */
103 #define DW_MCI_DESC_DATA_LENGTH 0x1000
104 
105 static bool dw_mci_reset(struct dw_mci *host);
106 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
107 static int dw_mci_card_busy(struct mmc_host *mmc);
108 static int dw_mci_get_cd(struct mmc_host *mmc);
109 
110 #if defined(CONFIG_DEBUG_FS)
111 static int dw_mci_req_show(struct seq_file *s, void *v)
112 {
113         struct dw_mci_slot *slot = s->private;
114         struct mmc_request *mrq;
115         struct mmc_command *cmd;
116         struct mmc_command *stop;
117         struct mmc_data *data;
118 
119         /* Make sure we get a consistent snapshot */
120         spin_lock_bh(&slot->host->lock);
121         mrq = slot->mrq;
122 
123         if (mrq) {
124                 cmd = mrq->cmd;
125                 data = mrq->data;
126                 stop = mrq->stop;
127 
128                 if (cmd)
129                         seq_printf(s,
130                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
131                                    cmd->opcode, cmd->arg, cmd->flags,
132                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
133                                    cmd->resp[2], cmd->error);
134                 if (data)
135                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
136                                    data->bytes_xfered, data->blocks,
137                                    data->blksz, data->flags, data->error);
138                 if (stop)
139                         seq_printf(s,
140                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
141                                    stop->opcode, stop->arg, stop->flags,
142                                    stop->resp[0], stop->resp[1], stop->resp[2],
143                                    stop->resp[2], stop->error);
144         }
145 
146         spin_unlock_bh(&slot->host->lock);
147 
148         return 0;
149 }
150 
151 static int dw_mci_req_open(struct inode *inode, struct file *file)
152 {
153         return single_open(file, dw_mci_req_show, inode->i_private);
154 }
155 
156 static const struct file_operations dw_mci_req_fops = {
157         .owner          = THIS_MODULE,
158         .open           = dw_mci_req_open,
159         .read           = seq_read,
160         .llseek         = seq_lseek,
161         .release        = single_release,
162 };
163 
164 static int dw_mci_regs_show(struct seq_file *s, void *v)
165 {
166         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
167         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
168         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
169         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
170         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
171         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
172 
173         return 0;
174 }
175 
176 static int dw_mci_regs_open(struct inode *inode, struct file *file)
177 {
178         return single_open(file, dw_mci_regs_show, inode->i_private);
179 }
180 
181 static const struct file_operations dw_mci_regs_fops = {
182         .owner          = THIS_MODULE,
183         .open           = dw_mci_regs_open,
184         .read           = seq_read,
185         .llseek         = seq_lseek,
186         .release        = single_release,
187 };
188 
189 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
190 {
191         struct mmc_host *mmc = slot->mmc;
192         struct dw_mci *host = slot->host;
193         struct dentry *root;
194         struct dentry *node;
195 
196         root = mmc->debugfs_root;
197         if (!root)
198                 return;
199 
200         node = debugfs_create_file("regs", S_IRUSR, root, host,
201                                    &dw_mci_regs_fops);
202         if (!node)
203                 goto err;
204 
205         node = debugfs_create_file("req", S_IRUSR, root, slot,
206                                    &dw_mci_req_fops);
207         if (!node)
208                 goto err;
209 
210         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
211         if (!node)
212                 goto err;
213 
214         node = debugfs_create_x32("pending_events", S_IRUSR, root,
215                                   (u32 *)&host->pending_events);
216         if (!node)
217                 goto err;
218 
219         node = debugfs_create_x32("completed_events", S_IRUSR, root,
220                                   (u32 *)&host->completed_events);
221         if (!node)
222                 goto err;
223 
224         return;
225 
226 err:
227         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
228 }
229 #endif /* defined(CONFIG_DEBUG_FS) */
230 
231 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
232 
233 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
234 {
235         struct mmc_data *data;
236         struct dw_mci_slot *slot = mmc_priv(mmc);
237         struct dw_mci *host = slot->host;
238         u32 cmdr;
239 
240         cmd->error = -EINPROGRESS;
241         cmdr = cmd->opcode;
242 
243         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
244             cmd->opcode == MMC_GO_IDLE_STATE ||
245             cmd->opcode == MMC_GO_INACTIVE_STATE ||
246             (cmd->opcode == SD_IO_RW_DIRECT &&
247              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
248                 cmdr |= SDMMC_CMD_STOP;
249         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
250                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
251 
252         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
253                 u32 clk_en_a;
254 
255                 /* Special bit makes CMD11 not die */
256                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
257 
258                 /* Change state to continue to handle CMD11 weirdness */
259                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
260                 slot->host->state = STATE_SENDING_CMD11;
261 
262                 /*
263                  * We need to disable low power mode (automatic clock stop)
264                  * while doing voltage switch so we don't confuse the card,
265                  * since stopping the clock is a specific part of the UHS
266                  * voltage change dance.
267                  *
268                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
269                  * unconditionally turned back on in dw_mci_setup_bus() if it's
270                  * ever called with a non-zero clock.  That shouldn't happen
271                  * until the voltage change is all done.
272                  */
273                 clk_en_a = mci_readl(host, CLKENA);
274                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
275                 mci_writel(host, CLKENA, clk_en_a);
276                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
277                              SDMMC_CMD_PRV_DAT_WAIT, 0);
278         }
279 
280         if (cmd->flags & MMC_RSP_PRESENT) {
281                 /* We expect a response, so set this bit */
282                 cmdr |= SDMMC_CMD_RESP_EXP;
283                 if (cmd->flags & MMC_RSP_136)
284                         cmdr |= SDMMC_CMD_RESP_LONG;
285         }
286 
287         if (cmd->flags & MMC_RSP_CRC)
288                 cmdr |= SDMMC_CMD_RESP_CRC;
289 
290         data = cmd->data;
291         if (data) {
292                 cmdr |= SDMMC_CMD_DAT_EXP;
293                 if (data->flags & MMC_DATA_WRITE)
294                         cmdr |= SDMMC_CMD_DAT_WR;
295         }
296 
297         if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags))
298                 cmdr |= SDMMC_CMD_USE_HOLD_REG;
299 
300         return cmdr;
301 }
302 
303 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
304 {
305         struct mmc_command *stop;
306         u32 cmdr;
307 
308         if (!cmd->data)
309                 return 0;
310 
311         stop = &host->stop_abort;
312         cmdr = cmd->opcode;
313         memset(stop, 0, sizeof(struct mmc_command));
314 
315         if (cmdr == MMC_READ_SINGLE_BLOCK ||
316             cmdr == MMC_READ_MULTIPLE_BLOCK ||
317             cmdr == MMC_WRITE_BLOCK ||
318             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
319             cmdr == MMC_SEND_TUNING_BLOCK ||
320             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
321                 stop->opcode = MMC_STOP_TRANSMISSION;
322                 stop->arg = 0;
323                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
324         } else if (cmdr == SD_IO_RW_EXTENDED) {
325                 stop->opcode = SD_IO_RW_DIRECT;
326                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
327                              ((cmd->arg >> 28) & 0x7);
328                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
329         } else {
330                 return 0;
331         }
332 
333         cmdr = stop->opcode | SDMMC_CMD_STOP |
334                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
335 
336         return cmdr;
337 }
338 
339 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
340 {
341         unsigned long timeout = jiffies + msecs_to_jiffies(500);
342 
343         /*
344          * Databook says that before issuing a new data transfer command
345          * we need to check to see if the card is busy.  Data transfer commands
346          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
347          *
348          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
349          * expected.
350          */
351         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
352             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
353                 while (mci_readl(host, STATUS) & SDMMC_STATUS_BUSY) {
354                         if (time_after(jiffies, timeout)) {
355                                 /* Command will fail; we'll pass error then */
356                                 dev_err(host->dev, "Busy; trying anyway\n");
357                                 break;
358                         }
359                         udelay(10);
360                 }
361         }
362 }
363 
364 static void dw_mci_start_command(struct dw_mci *host,
365                                  struct mmc_command *cmd, u32 cmd_flags)
366 {
367         host->cmd = cmd;
368         dev_vdbg(host->dev,
369                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
370                  cmd->arg, cmd_flags);
371 
372         mci_writel(host, CMDARG, cmd->arg);
373         wmb(); /* drain writebuffer */
374         dw_mci_wait_while_busy(host, cmd_flags);
375 
376         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
377 }
378 
379 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
380 {
381         struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
382 
383         dw_mci_start_command(host, stop, host->stop_cmdr);
384 }
385 
386 /* DMA interface functions */
387 static void dw_mci_stop_dma(struct dw_mci *host)
388 {
389         if (host->using_dma) {
390                 host->dma_ops->stop(host);
391                 host->dma_ops->cleanup(host);
392         }
393 
394         /* Data transfer was stopped by the interrupt handler */
395         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
396 }
397 
398 static int dw_mci_get_dma_dir(struct mmc_data *data)
399 {
400         if (data->flags & MMC_DATA_WRITE)
401                 return DMA_TO_DEVICE;
402         else
403                 return DMA_FROM_DEVICE;
404 }
405 
406 static void dw_mci_dma_cleanup(struct dw_mci *host)
407 {
408         struct mmc_data *data = host->data;
409 
410         if (data)
411                 if (!data->host_cookie)
412                         dma_unmap_sg(host->dev,
413                                      data->sg,
414                                      data->sg_len,
415                                      dw_mci_get_dma_dir(data));
416 }
417 
418 static void dw_mci_idmac_reset(struct dw_mci *host)
419 {
420         u32 bmod = mci_readl(host, BMOD);
421         /* Software reset of DMA */
422         bmod |= SDMMC_IDMAC_SWRESET;
423         mci_writel(host, BMOD, bmod);
424 }
425 
426 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
427 {
428         u32 temp;
429 
430         /* Disable and reset the IDMAC interface */
431         temp = mci_readl(host, CTRL);
432         temp &= ~SDMMC_CTRL_USE_IDMAC;
433         temp |= SDMMC_CTRL_DMA_RESET;
434         mci_writel(host, CTRL, temp);
435 
436         /* Stop the IDMAC running */
437         temp = mci_readl(host, BMOD);
438         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
439         temp |= SDMMC_IDMAC_SWRESET;
440         mci_writel(host, BMOD, temp);
441 }
442 
443 static void dw_mci_dmac_complete_dma(void *arg)
444 {
445         struct dw_mci *host = arg;
446         struct mmc_data *data = host->data;
447 
448         dev_vdbg(host->dev, "DMA complete\n");
449 
450         if ((host->use_dma == TRANS_MODE_EDMAC) &&
451             data && (data->flags & MMC_DATA_READ))
452                 /* Invalidate cache after read */
453                 dma_sync_sg_for_cpu(mmc_dev(host->cur_slot->mmc),
454                                     data->sg,
455                                     data->sg_len,
456                                     DMA_FROM_DEVICE);
457 
458         host->dma_ops->cleanup(host);
459 
460         /*
461          * If the card was removed, data will be NULL. No point in trying to
462          * send the stop command or waiting for NBUSY in this case.
463          */
464         if (data) {
465                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
466                 tasklet_schedule(&host->tasklet);
467         }
468 }
469 
470 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
471                                     unsigned int sg_len)
472 {
473         unsigned int desc_len;
474         int i;
475 
476         if (host->dma_64bit_address == 1) {
477                 struct idmac_desc_64addr *desc_first, *desc_last, *desc;
478 
479                 desc_first = desc_last = desc = host->sg_cpu;
480 
481                 for (i = 0; i < sg_len; i++) {
482                         unsigned int length = sg_dma_len(&data->sg[i]);
483 
484                         u64 mem_addr = sg_dma_address(&data->sg[i]);
485 
486                         for ( ; length ; desc++) {
487                                 desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
488                                            length : DW_MCI_DESC_DATA_LENGTH;
489 
490                                 length -= desc_len;
491 
492                                 /*
493                                  * Set the OWN bit and disable interrupts
494                                  * for this descriptor
495                                  */
496                                 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
497                                                         IDMAC_DES0_CH;
498 
499                                 /* Buffer length */
500                                 IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len);
501 
502                                 /* Physical address to DMA to/from */
503                                 desc->des4 = mem_addr & 0xffffffff;
504                                 desc->des5 = mem_addr >> 32;
505 
506                                 /* Update physical address for the next desc */
507                                 mem_addr += desc_len;
508 
509                                 /* Save pointer to the last descriptor */
510                                 desc_last = desc;
511                         }
512                 }
513 
514                 /* Set first descriptor */
515                 desc_first->des0 |= IDMAC_DES0_FD;
516 
517                 /* Set last descriptor */
518                 desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
519                 desc_last->des0 |= IDMAC_DES0_LD;
520 
521         } else {
522                 struct idmac_desc *desc_first, *desc_last, *desc;
523 
524                 desc_first = desc_last = desc = host->sg_cpu;
525 
526                 for (i = 0; i < sg_len; i++) {
527                         unsigned int length = sg_dma_len(&data->sg[i]);
528 
529                         u32 mem_addr = sg_dma_address(&data->sg[i]);
530 
531                         for ( ; length ; desc++) {
532                                 desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ?
533                                            length : DW_MCI_DESC_DATA_LENGTH;
534 
535                                 length -= desc_len;
536 
537                                 /*
538                                  * Set the OWN bit and disable interrupts
539                                  * for this descriptor
540                                  */
541                                 desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
542                                                          IDMAC_DES0_DIC |
543                                                          IDMAC_DES0_CH);
544 
545                                 /* Buffer length */
546                                 IDMAC_SET_BUFFER1_SIZE(desc, desc_len);
547 
548                                 /* Physical address to DMA to/from */
549                                 desc->des2 = cpu_to_le32(mem_addr);
550 
551                                 /* Update physical address for the next desc */
552                                 mem_addr += desc_len;
553 
554                                 /* Save pointer to the last descriptor */
555                                 desc_last = desc;
556                         }
557                 }
558 
559                 /* Set first descriptor */
560                 desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD);
561 
562                 /* Set last descriptor */
563                 desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH |
564                                                IDMAC_DES0_DIC));
565                 desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD);
566         }
567 
568         wmb(); /* drain writebuffer */
569 }
570 
571 static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
572 {
573         u32 temp;
574 
575         dw_mci_translate_sglist(host, host->data, sg_len);
576 
577         /* Make sure to reset DMA in case we did PIO before this */
578         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
579         dw_mci_idmac_reset(host);
580 
581         /* Select IDMAC interface */
582         temp = mci_readl(host, CTRL);
583         temp |= SDMMC_CTRL_USE_IDMAC;
584         mci_writel(host, CTRL, temp);
585 
586         /* drain writebuffer */
587         wmb();
588 
589         /* Enable the IDMAC */
590         temp = mci_readl(host, BMOD);
591         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
592         mci_writel(host, BMOD, temp);
593 
594         /* Start it running */
595         mci_writel(host, PLDMND, 1);
596 
597         return 0;
598 }
599 
600 static int dw_mci_idmac_init(struct dw_mci *host)
601 {
602         int i;
603 
604         if (host->dma_64bit_address == 1) {
605                 struct idmac_desc_64addr *p;
606                 /* Number of descriptors in the ring buffer */
607                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
608 
609                 /* Forward link the descriptor list */
610                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
611                                                                 i++, p++) {
612                         p->des6 = (host->sg_dma +
613                                         (sizeof(struct idmac_desc_64addr) *
614                                                         (i + 1))) & 0xffffffff;
615 
616                         p->des7 = (u64)(host->sg_dma +
617                                         (sizeof(struct idmac_desc_64addr) *
618                                                         (i + 1))) >> 32;
619                         /* Initialize reserved and buffer size fields to "" */
620                         p->des1 = 0;
621                         p->des2 = 0;
622                         p->des3 = 0;
623                 }
624 
625                 /* Set the last descriptor as the end-of-ring descriptor */
626                 p->des6 = host->sg_dma & 0xffffffff;
627                 p->des7 = (u64)host->sg_dma >> 32;
628                 p->des0 = IDMAC_DES0_ER;
629 
630         } else {
631                 struct idmac_desc *p;
632                 /* Number of descriptors in the ring buffer */
633                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
634 
635                 /* Forward link the descriptor list */
636                 for (i = 0, p = host->sg_cpu;
637                      i < host->ring_size - 1;
638                      i++, p++) {
639                         p->des3 = cpu_to_le32(host->sg_dma +
640                                         (sizeof(struct idmac_desc) * (i + 1)));
641                         p->des1 = 0;
642                 }
643 
644                 /* Set the last descriptor as the end-of-ring descriptor */
645                 p->des3 = cpu_to_le32(host->sg_dma);
646                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
647         }
648 
649         dw_mci_idmac_reset(host);
650 
651         if (host->dma_64bit_address == 1) {
652                 /* Mask out interrupts - get Tx & Rx complete only */
653                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
654                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
655                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
656 
657                 /* Set the descriptor base address */
658                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
659                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
660 
661         } else {
662                 /* Mask out interrupts - get Tx & Rx complete only */
663                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
664                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
665                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
666 
667                 /* Set the descriptor base address */
668                 mci_writel(host, DBADDR, host->sg_dma);
669         }
670 
671         return 0;
672 }
673 
674 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
675         .init = dw_mci_idmac_init,
676         .start = dw_mci_idmac_start_dma,
677         .stop = dw_mci_idmac_stop_dma,
678         .complete = dw_mci_dmac_complete_dma,
679         .cleanup = dw_mci_dma_cleanup,
680 };
681 
682 static void dw_mci_edmac_stop_dma(struct dw_mci *host)
683 {
684         dmaengine_terminate_async(host->dms->ch);
685 }
686 
687 static int dw_mci_edmac_start_dma(struct dw_mci *host,
688                                             unsigned int sg_len)
689 {
690         struct dma_slave_config cfg;
691         struct dma_async_tx_descriptor *desc = NULL;
692         struct scatterlist *sgl = host->data->sg;
693         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
694         u32 sg_elems = host->data->sg_len;
695         u32 fifoth_val;
696         u32 fifo_offset = host->fifo_reg - host->regs;
697         int ret = 0;
698 
699         /* Set external dma config: burst size, burst width */
700         cfg.dst_addr = host->phy_regs + fifo_offset;
701         cfg.src_addr = cfg.dst_addr;
702         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
703         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
704 
705         /* Match burst msize with external dma config */
706         fifoth_val = mci_readl(host, FIFOTH);
707         cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7];
708         cfg.src_maxburst = cfg.dst_maxburst;
709 
710         if (host->data->flags & MMC_DATA_WRITE)
711                 cfg.direction = DMA_MEM_TO_DEV;
712         else
713                 cfg.direction = DMA_DEV_TO_MEM;
714 
715         ret = dmaengine_slave_config(host->dms->ch, &cfg);
716         if (ret) {
717                 dev_err(host->dev, "Failed to config edmac.\n");
718                 return -EBUSY;
719         }
720 
721         desc = dmaengine_prep_slave_sg(host->dms->ch, sgl,
722                                        sg_len, cfg.direction,
723                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
724         if (!desc) {
725                 dev_err(host->dev, "Can't prepare slave sg.\n");
726                 return -EBUSY;
727         }
728 
729         /* Set dw_mci_dmac_complete_dma as callback */
730         desc->callback = dw_mci_dmac_complete_dma;
731         desc->callback_param = (void *)host;
732         dmaengine_submit(desc);
733 
734         /* Flush cache before write */
735         if (host->data->flags & MMC_DATA_WRITE)
736                 dma_sync_sg_for_device(mmc_dev(host->cur_slot->mmc), sgl,
737                                        sg_elems, DMA_TO_DEVICE);
738 
739         dma_async_issue_pending(host->dms->ch);
740 
741         return 0;
742 }
743 
744 static int dw_mci_edmac_init(struct dw_mci *host)
745 {
746         /* Request external dma channel */
747         host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL);
748         if (!host->dms)
749                 return -ENOMEM;
750 
751         host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
752         if (!host->dms->ch) {
753                 dev_err(host->dev, "Failed to get external DMA channel.\n");
754                 kfree(host->dms);
755                 host->dms = NULL;
756                 return -ENXIO;
757         }
758 
759         return 0;
760 }
761 
762 static void dw_mci_edmac_exit(struct dw_mci *host)
763 {
764         if (host->dms) {
765                 if (host->dms->ch) {
766                         dma_release_channel(host->dms->ch);
767                         host->dms->ch = NULL;
768                 }
769                 kfree(host->dms);
770                 host->dms = NULL;
771         }
772 }
773 
774 static const struct dw_mci_dma_ops dw_mci_edmac_ops = {
775         .init = dw_mci_edmac_init,
776         .exit = dw_mci_edmac_exit,
777         .start = dw_mci_edmac_start_dma,
778         .stop = dw_mci_edmac_stop_dma,
779         .complete = dw_mci_dmac_complete_dma,
780         .cleanup = dw_mci_dma_cleanup,
781 };
782 
783 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
784                                    struct mmc_data *data,
785                                    bool next)
786 {
787         struct scatterlist *sg;
788         unsigned int i, sg_len;
789 
790         if (!next && data->host_cookie)
791                 return data->host_cookie;
792 
793         /*
794          * We don't do DMA on "complex" transfers, i.e. with
795          * non-word-aligned buffers or lengths. Also, we don't bother
796          * with all the DMA setup overhead for short transfers.
797          */
798         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
799                 return -EINVAL;
800 
801         if (data->blksz & 3)
802                 return -EINVAL;
803 
804         for_each_sg(data->sg, sg, data->sg_len, i) {
805                 if (sg->offset & 3 || sg->length & 3)
806                         return -EINVAL;
807         }
808 
809         sg_len = dma_map_sg(host->dev,
810                             data->sg,
811                             data->sg_len,
812                             dw_mci_get_dma_dir(data));
813         if (sg_len == 0)
814                 return -EINVAL;
815 
816         if (next)
817                 data->host_cookie = sg_len;
818 
819         return sg_len;
820 }
821 
822 static void dw_mci_pre_req(struct mmc_host *mmc,
823                            struct mmc_request *mrq,
824                            bool is_first_req)
825 {
826         struct dw_mci_slot *slot = mmc_priv(mmc);
827         struct mmc_data *data = mrq->data;
828 
829         if (!slot->host->use_dma || !data)
830                 return;
831 
832         if (data->host_cookie) {
833                 data->host_cookie = 0;
834                 return;
835         }
836 
837         if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
838                 data->host_cookie = 0;
839 }
840 
841 static void dw_mci_post_req(struct mmc_host *mmc,
842                             struct mmc_request *mrq,
843                             int err)
844 {
845         struct dw_mci_slot *slot = mmc_priv(mmc);
846         struct mmc_data *data = mrq->data;
847 
848         if (!slot->host->use_dma || !data)
849                 return;
850 
851         if (data->host_cookie)
852                 dma_unmap_sg(slot->host->dev,
853                              data->sg,
854                              data->sg_len,
855                              dw_mci_get_dma_dir(data));
856         data->host_cookie = 0;
857 }
858 
859 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
860 {
861         unsigned int blksz = data->blksz;
862         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
863         u32 fifo_width = 1 << host->data_shift;
864         u32 blksz_depth = blksz / fifo_width, fifoth_val;
865         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
866         int idx = ARRAY_SIZE(mszs) - 1;
867 
868         /* pio should ship this scenario */
869         if (!host->use_dma)
870                 return;
871 
872         tx_wmark = (host->fifo_depth) / 2;
873         tx_wmark_invers = host->fifo_depth - tx_wmark;
874 
875         /*
876          * MSIZE is '1',
877          * if blksz is not a multiple of the FIFO width
878          */
879         if (blksz % fifo_width) {
880                 msize = 0;
881                 rx_wmark = 1;
882                 goto done;
883         }
884 
885         do {
886                 if (!((blksz_depth % mszs[idx]) ||
887                      (tx_wmark_invers % mszs[idx]))) {
888                         msize = idx;
889                         rx_wmark = mszs[idx] - 1;
890                         break;
891                 }
892         } while (--idx > 0);
893         /*
894          * If idx is '', it won't be tried
895          * Thus, initial values are uesed
896          */
897 done:
898         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
899         mci_writel(host, FIFOTH, fifoth_val);
900 }
901 
902 static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data)
903 {
904         unsigned int blksz = data->blksz;
905         u32 blksz_depth, fifo_depth;
906         u16 thld_size;
907         u8 enable;
908 
909         /*
910          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
911          * in the FIFO region, so we really shouldn't access it).
912          */
913         if (host->verid < DW_MMC_240A ||
914                 (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE))
915                 return;
916 
917         /*
918          * Card write Threshold is introduced since 2.80a
919          * It's used when HS400 mode is enabled.
920          */
921         if (data->flags & MMC_DATA_WRITE &&
922                 !(host->timing != MMC_TIMING_MMC_HS400))
923                 return;
924 
925         if (data->flags & MMC_DATA_WRITE)
926                 enable = SDMMC_CARD_WR_THR_EN;
927         else
928                 enable = SDMMC_CARD_RD_THR_EN;
929 
930         if (host->timing != MMC_TIMING_MMC_HS200 &&
931             host->timing != MMC_TIMING_UHS_SDR104)
932                 goto disable;
933 
934         blksz_depth = blksz / (1 << host->data_shift);
935         fifo_depth = host->fifo_depth;
936 
937         if (blksz_depth > fifo_depth)
938                 goto disable;
939 
940         /*
941          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
942          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
943          * Currently just choose blksz.
944          */
945         thld_size = blksz;
946         mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable));
947         return;
948 
949 disable:
950         mci_writel(host, CDTHRCTL, 0);
951 }
952 
953 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
954 {
955         unsigned long irqflags;
956         int sg_len;
957         u32 temp;
958 
959         host->using_dma = 0;
960 
961         /* If we don't have a channel, we can't do DMA */
962         if (!host->use_dma)
963                 return -ENODEV;
964 
965         sg_len = dw_mci_pre_dma_transfer(host, data, 0);
966         if (sg_len < 0) {
967                 host->dma_ops->stop(host);
968                 return sg_len;
969         }
970 
971         host->using_dma = 1;
972 
973         if (host->use_dma == TRANS_MODE_IDMAC)
974                 dev_vdbg(host->dev,
975                          "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
976                          (unsigned long)host->sg_cpu,
977                          (unsigned long)host->sg_dma,
978                          sg_len);
979 
980         /*
981          * Decide the MSIZE and RX/TX Watermark.
982          * If current block size is same with previous size,
983          * no need to update fifoth.
984          */
985         if (host->prev_blksz != data->blksz)
986                 dw_mci_adjust_fifoth(host, data);
987 
988         /* Enable the DMA interface */
989         temp = mci_readl(host, CTRL);
990         temp |= SDMMC_CTRL_DMA_ENABLE;
991         mci_writel(host, CTRL, temp);
992 
993         /* Disable RX/TX IRQs, let DMA handle it */
994         spin_lock_irqsave(&host->irq_lock, irqflags);
995         temp = mci_readl(host, INTMASK);
996         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
997         mci_writel(host, INTMASK, temp);
998         spin_unlock_irqrestore(&host->irq_lock, irqflags);
999 
1000         if (host->dma_ops->start(host, sg_len)) {
1001                 /* We can't do DMA */
1002                 dev_err(host->dev, "%s: failed to start DMA.\n", __func__);
1003                 return -ENODEV;
1004         }
1005 
1006         return 0;
1007 }
1008 
1009 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
1010 {
1011         unsigned long irqflags;
1012         int flags = SG_MITER_ATOMIC;
1013         u32 temp;
1014 
1015         data->error = -EINPROGRESS;
1016 
1017         WARN_ON(host->data);
1018         host->sg = NULL;
1019         host->data = data;
1020 
1021         if (data->flags & MMC_DATA_READ)
1022                 host->dir_status = DW_MCI_RECV_STATUS;
1023         else
1024                 host->dir_status = DW_MCI_SEND_STATUS;
1025 
1026         dw_mci_ctrl_thld(host, data);
1027 
1028         if (dw_mci_submit_data_dma(host, data)) {
1029                 if (host->data->flags & MMC_DATA_READ)
1030                         flags |= SG_MITER_TO_SG;
1031                 else
1032                         flags |= SG_MITER_FROM_SG;
1033 
1034                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1035                 host->sg = data->sg;
1036                 host->part_buf_start = 0;
1037                 host->part_buf_count = 0;
1038 
1039                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
1040 
1041                 spin_lock_irqsave(&host->irq_lock, irqflags);
1042                 temp = mci_readl(host, INTMASK);
1043                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
1044                 mci_writel(host, INTMASK, temp);
1045                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1046 
1047                 temp = mci_readl(host, CTRL);
1048                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
1049                 mci_writel(host, CTRL, temp);
1050 
1051                 /*
1052                  * Use the initial fifoth_val for PIO mode.
1053                  * If next issued data may be transfered by DMA mode,
1054                  * prev_blksz should be invalidated.
1055                  */
1056                 mci_writel(host, FIFOTH, host->fifoth_val);
1057                 host->prev_blksz = 0;
1058         } else {
1059                 /*
1060                  * Keep the current block size.
1061                  * It will be used to decide whether to update
1062                  * fifoth register next time.
1063                  */
1064                 host->prev_blksz = data->blksz;
1065         }
1066 }
1067 
1068 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
1069 {
1070         struct dw_mci *host = slot->host;
1071         unsigned long timeout = jiffies + msecs_to_jiffies(500);
1072         unsigned int cmd_status = 0;
1073 
1074         mci_writel(host, CMDARG, arg);
1075         wmb(); /* drain writebuffer */
1076         dw_mci_wait_while_busy(host, cmd);
1077         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
1078 
1079         while (time_before(jiffies, timeout)) {
1080                 cmd_status = mci_readl(host, CMD);
1081                 if (!(cmd_status & SDMMC_CMD_START))
1082                         return;
1083         }
1084         dev_err(&slot->mmc->class_dev,
1085                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
1086                 cmd, arg, cmd_status);
1087 }
1088 
1089 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
1090 {
1091         struct dw_mci *host = slot->host;
1092         unsigned int clock = slot->clock;
1093         u32 div;
1094         u32 clk_en_a;
1095         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
1096 
1097         /* We must continue to set bit 28 in CMD until the change is complete */
1098         if (host->state == STATE_WAITING_CMD11_DONE)
1099                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
1100 
1101         if (!clock) {
1102                 mci_writel(host, CLKENA, 0);
1103                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1104         } else if (clock != host->current_speed || force_clkinit) {
1105                 div = host->bus_hz / clock;
1106                 if (host->bus_hz % clock && host->bus_hz > clock)
1107                         /*
1108                          * move the + 1 after the divide to prevent
1109                          * over-clocking the card.
1110                          */
1111                         div += 1;
1112 
1113                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
1114 
1115                 if (clock != slot->__clk_old || force_clkinit)
1116                         dev_info(&slot->mmc->class_dev,
1117                                  "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
1118                                  slot->id, host->bus_hz, clock,
1119                                  div ? ((host->bus_hz / div) >> 1) :
1120                                  host->bus_hz, div);
1121 
1122                 /* disable clock */
1123                 mci_writel(host, CLKENA, 0);
1124                 mci_writel(host, CLKSRC, 0);
1125 
1126                 /* inform CIU */
1127                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1128 
1129                 /* set clock to desired speed */
1130                 mci_writel(host, CLKDIV, div);
1131 
1132                 /* inform CIU */
1133                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1134 
1135                 /* enable clock; only low power if no SDIO */
1136                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
1137                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
1138                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
1139                 mci_writel(host, CLKENA, clk_en_a);
1140 
1141                 /* inform CIU */
1142                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
1143 
1144                 /* keep the last clock value that was requested from core */
1145                 slot->__clk_old = clock;
1146         }
1147 
1148         host->current_speed = clock;
1149 
1150         /* Set the current slot bus width */
1151         mci_writel(host, CTYPE, (slot->ctype << slot->id));
1152 }
1153 
1154 static void __dw_mci_start_request(struct dw_mci *host,
1155                                    struct dw_mci_slot *slot,
1156                                    struct mmc_command *cmd)
1157 {
1158         struct mmc_request *mrq;
1159         struct mmc_data *data;
1160         u32 cmdflags;
1161 
1162         mrq = slot->mrq;
1163 
1164         host->cur_slot = slot;
1165         host->mrq = mrq;
1166 
1167         host->pending_events = 0;
1168         host->completed_events = 0;
1169         host->cmd_status = 0;
1170         host->data_status = 0;
1171         host->dir_status = 0;
1172 
1173         data = cmd->data;
1174         if (data) {
1175                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1176                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1177                 mci_writel(host, BLKSIZ, data->blksz);
1178         }
1179 
1180         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1181 
1182         /* this is the first command, send the initialization clock */
1183         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1184                 cmdflags |= SDMMC_CMD_INIT;
1185 
1186         if (data) {
1187                 dw_mci_submit_data(host, data);
1188                 wmb(); /* drain writebuffer */
1189         }
1190 
1191         dw_mci_start_command(host, cmd, cmdflags);
1192 
1193         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1194                 unsigned long irqflags;
1195 
1196                 /*
1197                  * Databook says to fail after 2ms w/ no response, but evidence
1198                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1199                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1200                  * is just about to roll over.
1201                  *
1202                  * We do this whole thing under spinlock and only if the
1203                  * command hasn't already completed (indicating the the irq
1204                  * already ran so we don't want the timeout).
1205                  */
1206                 spin_lock_irqsave(&host->irq_lock, irqflags);
1207                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1208                         mod_timer(&host->cmd11_timer,
1209                                 jiffies + msecs_to_jiffies(500) + 1);
1210                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1211         }
1212 
1213         if (mrq->stop)
1214                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
1215         else
1216                 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1217 }
1218 
1219 static void dw_mci_start_request(struct dw_mci *host,
1220                                  struct dw_mci_slot *slot)
1221 {
1222         struct mmc_request *mrq = slot->mrq;
1223         struct mmc_command *cmd;
1224 
1225         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1226         __dw_mci_start_request(host, slot, cmd);
1227 }
1228 
1229 /* must be called with host->lock held */
1230 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1231                                  struct mmc_request *mrq)
1232 {
1233         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1234                  host->state);
1235 
1236         slot->mrq = mrq;
1237 
1238         if (host->state == STATE_WAITING_CMD11_DONE) {
1239                 dev_warn(&slot->mmc->class_dev,
1240                          "Voltage change didn't complete\n");
1241                 /*
1242                  * this case isn't expected to happen, so we can
1243                  * either crash here or just try to continue on
1244                  * in the closest possible state
1245                  */
1246                 host->state = STATE_IDLE;
1247         }
1248 
1249         if (host->state == STATE_IDLE) {
1250                 host->state = STATE_SENDING_CMD;
1251                 dw_mci_start_request(host, slot);
1252         } else {
1253                 list_add_tail(&slot->queue_node, &host->queue);
1254         }
1255 }
1256 
1257 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1258 {
1259         struct dw_mci_slot *slot = mmc_priv(mmc);
1260         struct dw_mci *host = slot->host;
1261 
1262         WARN_ON(slot->mrq);
1263 
1264         /*
1265          * The check for card presence and queueing of the request must be
1266          * atomic, otherwise the card could be removed in between and the
1267          * request wouldn't fail until another card was inserted.
1268          */
1269 
1270         if (!dw_mci_get_cd(mmc)) {
1271                 mrq->cmd->error = -ENOMEDIUM;
1272                 mmc_request_done(mmc, mrq);
1273                 return;
1274         }
1275 
1276         spin_lock_bh(&host->lock);
1277 
1278         dw_mci_queue_request(host, slot, mrq);
1279 
1280         spin_unlock_bh(&host->lock);
1281 }
1282 
1283 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1284 {
1285         struct dw_mci_slot *slot = mmc_priv(mmc);
1286         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1287         u32 regs;
1288         int ret;
1289 
1290         switch (ios->bus_width) {
1291         case MMC_BUS_WIDTH_4:
1292                 slot->ctype = SDMMC_CTYPE_4BIT;
1293                 break;
1294         case MMC_BUS_WIDTH_8:
1295                 slot->ctype = SDMMC_CTYPE_8BIT;
1296                 break;
1297         default:
1298                 /* set default 1 bit mode */
1299                 slot->ctype = SDMMC_CTYPE_1BIT;
1300         }
1301 
1302         regs = mci_readl(slot->host, UHS_REG);
1303 
1304         /* DDR mode set */
1305         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1306             ios->timing == MMC_TIMING_UHS_DDR50 ||
1307             ios->timing == MMC_TIMING_MMC_HS400)
1308                 regs |= ((0x1 << slot->id) << 16);
1309         else
1310                 regs &= ~((0x1 << slot->id) << 16);
1311 
1312         mci_writel(slot->host, UHS_REG, regs);
1313         slot->host->timing = ios->timing;
1314 
1315         /*
1316          * Use mirror of ios->clock to prevent race with mmc
1317          * core ios update when finding the minimum.
1318          */
1319         slot->clock = ios->clock;
1320 
1321         if (drv_data && drv_data->set_ios)
1322                 drv_data->set_ios(slot->host, ios);
1323 
1324         switch (ios->power_mode) {
1325         case MMC_POWER_UP:
1326                 if (!IS_ERR(mmc->supply.vmmc)) {
1327                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1328                                         ios->vdd);
1329                         if (ret) {
1330                                 dev_err(slot->host->dev,
1331                                         "failed to enable vmmc regulator\n");
1332                                 /*return, if failed turn on vmmc*/
1333                                 return;
1334                         }
1335                 }
1336                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1337                 regs = mci_readl(slot->host, PWREN);
1338                 regs |= (1 << slot->id);
1339                 mci_writel(slot->host, PWREN, regs);
1340                 break;
1341         case MMC_POWER_ON:
1342                 if (!slot->host->vqmmc_enabled) {
1343                         if (!IS_ERR(mmc->supply.vqmmc)) {
1344                                 ret = regulator_enable(mmc->supply.vqmmc);
1345                                 if (ret < 0)
1346                                         dev_err(slot->host->dev,
1347                                                 "failed to enable vqmmc\n");
1348                                 else
1349                                         slot->host->vqmmc_enabled = true;
1350 
1351                         } else {
1352                                 /* Keep track so we don't reset again */
1353                                 slot->host->vqmmc_enabled = true;
1354                         }
1355 
1356                         /* Reset our state machine after powering on */
1357                         dw_mci_ctrl_reset(slot->host,
1358                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1359                 }
1360 
1361                 /* Adjust clock / bus width after power is up */
1362                 dw_mci_setup_bus(slot, false);
1363 
1364                 break;
1365         case MMC_POWER_OFF:
1366                 /* Turn clock off before power goes down */
1367                 dw_mci_setup_bus(slot, false);
1368 
1369                 if (!IS_ERR(mmc->supply.vmmc))
1370                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1371 
1372                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1373                         regulator_disable(mmc->supply.vqmmc);
1374                 slot->host->vqmmc_enabled = false;
1375 
1376                 regs = mci_readl(slot->host, PWREN);
1377                 regs &= ~(1 << slot->id);
1378                 mci_writel(slot->host, PWREN, regs);
1379                 break;
1380         default:
1381                 break;
1382         }
1383 
1384         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1385                 slot->host->state = STATE_IDLE;
1386 }
1387 
1388 static int dw_mci_card_busy(struct mmc_host *mmc)
1389 {
1390         struct dw_mci_slot *slot = mmc_priv(mmc);
1391         u32 status;
1392 
1393         /*
1394          * Check the busy bit which is low when DAT[3:0]
1395          * (the data lines) are 0000
1396          */
1397         status = mci_readl(slot->host, STATUS);
1398 
1399         return !!(status & SDMMC_STATUS_BUSY);
1400 }
1401 
1402 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1403 {
1404         struct dw_mci_slot *slot = mmc_priv(mmc);
1405         struct dw_mci *host = slot->host;
1406         const struct dw_mci_drv_data *drv_data = host->drv_data;
1407         u32 uhs;
1408         u32 v18 = SDMMC_UHS_18V << slot->id;
1409         int ret;
1410 
1411         if (drv_data && drv_data->switch_voltage)
1412                 return drv_data->switch_voltage(mmc, ios);
1413 
1414         /*
1415          * Program the voltage.  Note that some instances of dw_mmc may use
1416          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1417          * does no harm but you need to set the regulator directly.  Try both.
1418          */
1419         uhs = mci_readl(host, UHS_REG);
1420         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1421                 uhs &= ~v18;
1422         else
1423                 uhs |= v18;
1424 
1425         if (!IS_ERR(mmc->supply.vqmmc)) {
1426                 ret = mmc_regulator_set_vqmmc(mmc, ios);
1427 
1428                 if (ret) {
1429                         dev_dbg(&mmc->class_dev,
1430                                          "Regulator set error %d - %s V\n",
1431                                          ret, uhs & v18 ? "1.8" : "3.3");
1432                         return ret;
1433                 }
1434         }
1435         mci_writel(host, UHS_REG, uhs);
1436 
1437         return 0;
1438 }
1439 
1440 static int dw_mci_get_ro(struct mmc_host *mmc)
1441 {
1442         int read_only;
1443         struct dw_mci_slot *slot = mmc_priv(mmc);
1444         int gpio_ro = mmc_gpio_get_ro(mmc);
1445 
1446         /* Use platform get_ro function, else try on board write protect */
1447         if (gpio_ro >= 0)
1448                 read_only = gpio_ro;
1449         else
1450                 read_only =
1451                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1452 
1453         dev_dbg(&mmc->class_dev, "card is %s\n",
1454                 read_only ? "read-only" : "read-write");
1455 
1456         return read_only;
1457 }
1458 
1459 static int dw_mci_get_cd(struct mmc_host *mmc)
1460 {
1461         int present;
1462         struct dw_mci_slot *slot = mmc_priv(mmc);
1463         struct dw_mci *host = slot->host;
1464         int gpio_cd = mmc_gpio_get_cd(mmc);
1465 
1466         /* Use platform get_cd function, else try onboard card detect */
1467         if ((mmc->caps & MMC_CAP_NEEDS_POLL) || !mmc_card_is_removable(mmc))
1468                 present = 1;
1469         else if (gpio_cd >= 0)
1470                 present = gpio_cd;
1471         else
1472                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1473                         == 0 ? 1 : 0;
1474 
1475         spin_lock_bh(&host->lock);
1476         if (present) {
1477                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1478                 dev_dbg(&mmc->class_dev, "card is present\n");
1479         } else {
1480                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1481                 dev_dbg(&mmc->class_dev, "card is not present\n");
1482         }
1483         spin_unlock_bh(&host->lock);
1484 
1485         return present;
1486 }
1487 
1488 static void dw_mci_hw_reset(struct mmc_host *mmc)
1489 {
1490         struct dw_mci_slot *slot = mmc_priv(mmc);
1491         struct dw_mci *host = slot->host;
1492         int reset;
1493 
1494         if (host->use_dma == TRANS_MODE_IDMAC)
1495                 dw_mci_idmac_reset(host);
1496 
1497         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET |
1498                                      SDMMC_CTRL_FIFO_RESET))
1499                 return;
1500 
1501         /*
1502          * According to eMMC spec, card reset procedure:
1503          * tRstW >= 1us:   RST_n pulse width
1504          * tRSCA >= 200us: RST_n to Command time
1505          * tRSTH >= 1us:   RST_n high period
1506          */
1507         reset = mci_readl(host, RST_N);
1508         reset &= ~(SDMMC_RST_HWACTIVE << slot->id);
1509         mci_writel(host, RST_N, reset);
1510         usleep_range(1, 2);
1511         reset |= SDMMC_RST_HWACTIVE << slot->id;
1512         mci_writel(host, RST_N, reset);
1513         usleep_range(200, 300);
1514 }
1515 
1516 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1517 {
1518         struct dw_mci_slot *slot = mmc_priv(mmc);
1519         struct dw_mci *host = slot->host;
1520 
1521         /*
1522          * Low power mode will stop the card clock when idle.  According to the
1523          * description of the CLKENA register we should disable low power mode
1524          * for SDIO cards if we need SDIO interrupts to work.
1525          */
1526         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1527                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1528                 u32 clk_en_a_old;
1529                 u32 clk_en_a;
1530 
1531                 clk_en_a_old = mci_readl(host, CLKENA);
1532 
1533                 if (card->type == MMC_TYPE_SDIO ||
1534                     card->type == MMC_TYPE_SD_COMBO) {
1535                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1536                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1537                 } else {
1538                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1539                         clk_en_a = clk_en_a_old | clken_low_pwr;
1540                 }
1541 
1542                 if (clk_en_a != clk_en_a_old) {
1543                         mci_writel(host, CLKENA, clk_en_a);
1544                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1545                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1546                 }
1547         }
1548 }
1549 
1550 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1551 {
1552         struct dw_mci_slot *slot = mmc_priv(mmc);
1553         struct dw_mci *host = slot->host;
1554         unsigned long irqflags;
1555         u32 int_mask;
1556 
1557         spin_lock_irqsave(&host->irq_lock, irqflags);
1558 
1559         /* Enable/disable Slot Specific SDIO interrupt */
1560         int_mask = mci_readl(host, INTMASK);
1561         if (enb)
1562                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1563         else
1564                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1565         mci_writel(host, INTMASK, int_mask);
1566 
1567         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1568 }
1569 
1570 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1571 {
1572         struct dw_mci_slot *slot = mmc_priv(mmc);
1573         struct dw_mci *host = slot->host;
1574         const struct dw_mci_drv_data *drv_data = host->drv_data;
1575         int err = -EINVAL;
1576 
1577         if (drv_data && drv_data->execute_tuning)
1578                 err = drv_data->execute_tuning(slot, opcode);
1579         return err;
1580 }
1581 
1582 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc,
1583                                        struct mmc_ios *ios)
1584 {
1585         struct dw_mci_slot *slot = mmc_priv(mmc);
1586         struct dw_mci *host = slot->host;
1587         const struct dw_mci_drv_data *drv_data = host->drv_data;
1588 
1589         if (drv_data && drv_data->prepare_hs400_tuning)
1590                 return drv_data->prepare_hs400_tuning(host, ios);
1591 
1592         return 0;
1593 }
1594 
1595 static const struct mmc_host_ops dw_mci_ops = {
1596         .request                = dw_mci_request,
1597         .pre_req                = dw_mci_pre_req,
1598         .post_req               = dw_mci_post_req,
1599         .set_ios                = dw_mci_set_ios,
1600         .get_ro                 = dw_mci_get_ro,
1601         .get_cd                 = dw_mci_get_cd,
1602         .hw_reset               = dw_mci_hw_reset,
1603         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1604         .execute_tuning         = dw_mci_execute_tuning,
1605         .card_busy              = dw_mci_card_busy,
1606         .start_signal_voltage_switch = dw_mci_switch_voltage,
1607         .init_card              = dw_mci_init_card,
1608         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1609 };
1610 
1611 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1612         __releases(&host->lock)
1613         __acquires(&host->lock)
1614 {
1615         struct dw_mci_slot *slot;
1616         struct mmc_host *prev_mmc = host->cur_slot->mmc;
1617 
1618         WARN_ON(host->cmd || host->data);
1619 
1620         host->cur_slot->mrq = NULL;
1621         host->mrq = NULL;
1622         if (!list_empty(&host->queue)) {
1623                 slot = list_entry(host->queue.next,
1624                                   struct dw_mci_slot, queue_node);
1625                 list_del(&slot->queue_node);
1626                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1627                          mmc_hostname(slot->mmc));
1628                 host->state = STATE_SENDING_CMD;
1629                 dw_mci_start_request(host, slot);
1630         } else {
1631                 dev_vdbg(host->dev, "list empty\n");
1632 
1633                 if (host->state == STATE_SENDING_CMD11)
1634                         host->state = STATE_WAITING_CMD11_DONE;
1635                 else
1636                         host->state = STATE_IDLE;
1637         }
1638 
1639         spin_unlock(&host->lock);
1640         mmc_request_done(prev_mmc, mrq);
1641         spin_lock(&host->lock);
1642 }
1643 
1644 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1645 {
1646         u32 status = host->cmd_status;
1647 
1648         host->cmd_status = 0;
1649 
1650         /* Read the response from the card (up to 16 bytes) */
1651         if (cmd->flags & MMC_RSP_PRESENT) {
1652                 if (cmd->flags & MMC_RSP_136) {
1653                         cmd->resp[3] = mci_readl(host, RESP0);
1654                         cmd->resp[2] = mci_readl(host, RESP1);
1655                         cmd->resp[1] = mci_readl(host, RESP2);
1656                         cmd->resp[0] = mci_readl(host, RESP3);
1657                 } else {
1658                         cmd->resp[0] = mci_readl(host, RESP0);
1659                         cmd->resp[1] = 0;
1660                         cmd->resp[2] = 0;
1661                         cmd->resp[3] = 0;
1662                 }
1663         }
1664 
1665         if (status & SDMMC_INT_RTO)
1666                 cmd->error = -ETIMEDOUT;
1667         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1668                 cmd->error = -EILSEQ;
1669         else if (status & SDMMC_INT_RESP_ERR)
1670                 cmd->error = -EIO;
1671         else
1672                 cmd->error = 0;
1673 
1674         return cmd->error;
1675 }
1676 
1677 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1678 {
1679         u32 status = host->data_status;
1680 
1681         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1682                 if (status & SDMMC_INT_DRTO) {
1683                         data->error = -ETIMEDOUT;
1684                 } else if (status & SDMMC_INT_DCRC) {
1685                         data->error = -EILSEQ;
1686                 } else if (status & SDMMC_INT_EBE) {
1687                         if (host->dir_status ==
1688                                 DW_MCI_SEND_STATUS) {
1689                                 /*
1690                                  * No data CRC status was returned.
1691                                  * The number of bytes transferred
1692                                  * will be exaggerated in PIO mode.
1693                                  */
1694                                 data->bytes_xfered = 0;
1695                                 data->error = -ETIMEDOUT;
1696                         } else if (host->dir_status ==
1697                                         DW_MCI_RECV_STATUS) {
1698                                 data->error = -EIO;
1699                         }
1700                 } else {
1701                         /* SDMMC_INT_SBE is included */
1702                         data->error = -EIO;
1703                 }
1704 
1705                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1706 
1707                 /*
1708                  * After an error, there may be data lingering
1709                  * in the FIFO
1710                  */
1711                 dw_mci_reset(host);
1712         } else {
1713                 data->bytes_xfered = data->blocks * data->blksz;
1714                 data->error = 0;
1715         }
1716 
1717         return data->error;
1718 }
1719 
1720 static void dw_mci_set_drto(struct dw_mci *host)
1721 {
1722         unsigned int drto_clks;
1723         unsigned int drto_ms;
1724 
1725         drto_clks = mci_readl(host, TMOUT) >> 8;
1726         drto_ms = DIV_ROUND_UP(drto_clks, host->bus_hz / 1000);
1727 
1728         /* add a bit spare time */
1729         drto_ms += 10;
1730 
1731         mod_timer(&host->dto_timer, jiffies + msecs_to_jiffies(drto_ms));
1732 }
1733 
1734 static void dw_mci_tasklet_func(unsigned long priv)
1735 {
1736         struct dw_mci *host = (struct dw_mci *)priv;
1737         struct mmc_data *data;
1738         struct mmc_command *cmd;
1739         struct mmc_request *mrq;
1740         enum dw_mci_state state;
1741         enum dw_mci_state prev_state;
1742         unsigned int err;
1743 
1744         spin_lock(&host->lock);
1745 
1746         state = host->state;
1747         data = host->data;
1748         mrq = host->mrq;
1749 
1750         do {
1751                 prev_state = state;
1752 
1753                 switch (state) {
1754                 case STATE_IDLE:
1755                 case STATE_WAITING_CMD11_DONE:
1756                         break;
1757 
1758                 case STATE_SENDING_CMD11:
1759                 case STATE_SENDING_CMD:
1760                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1761                                                 &host->pending_events))
1762                                 break;
1763 
1764                         cmd = host->cmd;
1765                         host->cmd = NULL;
1766                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1767                         err = dw_mci_command_complete(host, cmd);
1768                         if (cmd == mrq->sbc && !err) {
1769                                 prev_state = state = STATE_SENDING_CMD;
1770                                 __dw_mci_start_request(host, host->cur_slot,
1771                                                        mrq->cmd);
1772                                 goto unlock;
1773                         }
1774 
1775                         if (cmd->data && err) {
1776                                 /*
1777                                  * During UHS tuning sequence, sending the stop
1778                                  * command after the response CRC error would
1779                                  * throw the system into a confused state
1780                                  * causing all future tuning phases to report
1781                                  * failure.
1782                                  *
1783                                  * In such case controller will move into a data
1784                                  * transfer state after a response error or
1785                                  * response CRC error. Let's let that finish
1786                                  * before trying to send a stop, so we'll go to
1787                                  * STATE_SENDING_DATA.
1788                                  *
1789                                  * Although letting the data transfer take place
1790                                  * will waste a bit of time (we already know
1791                                  * the command was bad), it can't cause any
1792                                  * errors since it's possible it would have
1793                                  * taken place anyway if this tasklet got
1794                                  * delayed. Allowing the transfer to take place
1795                                  * avoids races and keeps things simple.
1796                                  */
1797                                 if ((err != -ETIMEDOUT) &&
1798                                     (cmd->opcode == MMC_SEND_TUNING_BLOCK)) {
1799                                         state = STATE_SENDING_DATA;
1800                                         continue;
1801                                 }
1802 
1803                                 dw_mci_stop_dma(host);
1804                                 send_stop_abort(host, data);
1805                                 state = STATE_SENDING_STOP;
1806                                 break;
1807                         }
1808 
1809                         if (!cmd->data || err) {
1810                                 dw_mci_request_end(host, mrq);
1811                                 goto unlock;
1812                         }
1813 
1814                         prev_state = state = STATE_SENDING_DATA;
1815                         /* fall through */
1816 
1817                 case STATE_SENDING_DATA:
1818                         /*
1819                          * We could get a data error and never a transfer
1820                          * complete so we'd better check for it here.
1821                          *
1822                          * Note that we don't really care if we also got a
1823                          * transfer complete; stopping the DMA and sending an
1824                          * abort won't hurt.
1825                          */
1826                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1827                                                &host->pending_events)) {
1828                                 dw_mci_stop_dma(host);
1829                                 if (data->stop ||
1830                                     !(host->data_status & (SDMMC_INT_DRTO |
1831                                                            SDMMC_INT_EBE)))
1832                                         send_stop_abort(host, data);
1833                                 state = STATE_DATA_ERROR;
1834                                 break;
1835                         }
1836 
1837                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1838                                                 &host->pending_events)) {
1839                                 /*
1840                                  * If all data-related interrupts don't come
1841                                  * within the given time in reading data state.
1842                                  */
1843                                 if (host->dir_status == DW_MCI_RECV_STATUS)
1844                                         dw_mci_set_drto(host);
1845                                 break;
1846                         }
1847 
1848                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1849 
1850                         /*
1851                          * Handle an EVENT_DATA_ERROR that might have shown up
1852                          * before the transfer completed.  This might not have
1853                          * been caught by the check above because the interrupt
1854                          * could have gone off between the previous check and
1855                          * the check for transfer complete.
1856                          *
1857                          * Technically this ought not be needed assuming we
1858                          * get a DATA_COMPLETE eventually (we'll notice the
1859                          * error and end the request), but it shouldn't hurt.
1860                          *
1861                          * This has the advantage of sending the stop command.
1862                          */
1863                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1864                                                &host->pending_events)) {
1865                                 dw_mci_stop_dma(host);
1866                                 if (data->stop ||
1867                                     !(host->data_status & (SDMMC_INT_DRTO |
1868                                                            SDMMC_INT_EBE)))
1869                                         send_stop_abort(host, data);
1870                                 state = STATE_DATA_ERROR;
1871                                 break;
1872                         }
1873                         prev_state = state = STATE_DATA_BUSY;
1874 
1875                         /* fall through */
1876 
1877                 case STATE_DATA_BUSY:
1878                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1879                                                 &host->pending_events)) {
1880                                 /*
1881                                  * If data error interrupt comes but data over
1882                                  * interrupt doesn't come within the given time.
1883                                  * in reading data state.
1884                                  */
1885                                 if (host->dir_status == DW_MCI_RECV_STATUS)
1886                                         dw_mci_set_drto(host);
1887                                 break;
1888                         }
1889 
1890                         host->data = NULL;
1891                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1892                         err = dw_mci_data_complete(host, data);
1893 
1894                         if (!err) {
1895                                 if (!data->stop || mrq->sbc) {
1896                                         if (mrq->sbc && data->stop)
1897                                                 data->stop->error = 0;
1898                                         dw_mci_request_end(host, mrq);
1899                                         goto unlock;
1900                                 }
1901 
1902                                 /* stop command for open-ended transfer*/
1903                                 if (data->stop)
1904                                         send_stop_abort(host, data);
1905                         } else {
1906                                 /*
1907                                  * If we don't have a command complete now we'll
1908                                  * never get one since we just reset everything;
1909                                  * better end the request.
1910                                  *
1911                                  * If we do have a command complete we'll fall
1912                                  * through to the SENDING_STOP command and
1913                                  * everything will be peachy keen.
1914                                  */
1915                                 if (!test_bit(EVENT_CMD_COMPLETE,
1916                                               &host->pending_events)) {
1917                                         host->cmd = NULL;
1918                                         dw_mci_request_end(host, mrq);
1919                                         goto unlock;
1920                                 }
1921                         }
1922 
1923                         /*
1924                          * If err has non-zero,
1925                          * stop-abort command has been already issued.
1926                          */
1927                         prev_state = state = STATE_SENDING_STOP;
1928 
1929                         /* fall through */
1930 
1931                 case STATE_SENDING_STOP:
1932                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1933                                                 &host->pending_events))
1934                                 break;
1935 
1936                         /* CMD error in data command */
1937                         if (mrq->cmd->error && mrq->data)
1938                                 dw_mci_reset(host);
1939 
1940                         host->cmd = NULL;
1941                         host->data = NULL;
1942 
1943                         if (mrq->stop)
1944                                 dw_mci_command_complete(host, mrq->stop);
1945                         else
1946                                 host->cmd_status = 0;
1947 
1948                         dw_mci_request_end(host, mrq);
1949                         goto unlock;
1950 
1951                 case STATE_DATA_ERROR:
1952                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1953                                                 &host->pending_events))
1954                                 break;
1955 
1956                         state = STATE_DATA_BUSY;
1957                         break;
1958                 }
1959         } while (state != prev_state);
1960 
1961         host->state = state;
1962 unlock:
1963         spin_unlock(&host->lock);
1964 
1965 }
1966 
1967 /* push final bytes to part_buf, only use during push */
1968 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1969 {
1970         memcpy((void *)&host->part_buf, buf, cnt);
1971         host->part_buf_count = cnt;
1972 }
1973 
1974 /* append bytes to part_buf, only use during push */
1975 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1976 {
1977         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1978         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1979         host->part_buf_count += cnt;
1980         return cnt;
1981 }
1982 
1983 /* pull first bytes from part_buf, only use during pull */
1984 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1985 {
1986         cnt = min_t(int, cnt, host->part_buf_count);
1987         if (cnt) {
1988                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1989                        cnt);
1990                 host->part_buf_count -= cnt;
1991                 host->part_buf_start += cnt;
1992         }
1993         return cnt;
1994 }
1995 
1996 /* pull final bytes from the part_buf, assuming it's just been filled */
1997 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1998 {
1999         memcpy(buf, &host->part_buf, cnt);
2000         host->part_buf_start = cnt;
2001         host->part_buf_count = (1 << host->data_shift) - cnt;
2002 }
2003 
2004 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
2005 {
2006         struct mmc_data *data = host->data;
2007         int init_cnt = cnt;
2008 
2009         /* try and push anything in the part_buf */
2010         if (unlikely(host->part_buf_count)) {
2011                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2012 
2013                 buf += len;
2014                 cnt -= len;
2015                 if (host->part_buf_count == 2) {
2016                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2017                         host->part_buf_count = 0;
2018                 }
2019         }
2020 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2021         if (unlikely((unsigned long)buf & 0x1)) {
2022                 while (cnt >= 2) {
2023                         u16 aligned_buf[64];
2024                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2025                         int items = len >> 1;
2026                         int i;
2027                         /* memcpy from input buffer into aligned buffer */
2028                         memcpy(aligned_buf, buf, len);
2029                         buf += len;
2030                         cnt -= len;
2031                         /* push data from aligned buffer into fifo */
2032                         for (i = 0; i < items; ++i)
2033                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
2034                 }
2035         } else
2036 #endif
2037         {
2038                 u16 *pdata = buf;
2039 
2040                 for (; cnt >= 2; cnt -= 2)
2041                         mci_fifo_writew(host->fifo_reg, *pdata++);
2042                 buf = pdata;
2043         }
2044         /* put anything remaining in the part_buf */
2045         if (cnt) {
2046                 dw_mci_set_part_bytes(host, buf, cnt);
2047                  /* Push data if we have reached the expected data length */
2048                 if ((data->bytes_xfered + init_cnt) ==
2049                     (data->blksz * data->blocks))
2050                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
2051         }
2052 }
2053 
2054 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
2055 {
2056 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2057         if (unlikely((unsigned long)buf & 0x1)) {
2058                 while (cnt >= 2) {
2059                         /* pull data from fifo into aligned buffer */
2060                         u16 aligned_buf[64];
2061                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
2062                         int items = len >> 1;
2063                         int i;
2064 
2065                         for (i = 0; i < items; ++i)
2066                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
2067                         /* memcpy from aligned buffer into output buffer */
2068                         memcpy(buf, aligned_buf, len);
2069                         buf += len;
2070                         cnt -= len;
2071                 }
2072         } else
2073 #endif
2074         {
2075                 u16 *pdata = buf;
2076 
2077                 for (; cnt >= 2; cnt -= 2)
2078                         *pdata++ = mci_fifo_readw(host->fifo_reg);
2079                 buf = pdata;
2080         }
2081         if (cnt) {
2082                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
2083                 dw_mci_pull_final_bytes(host, buf, cnt);
2084         }
2085 }
2086 
2087 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
2088 {
2089         struct mmc_data *data = host->data;
2090         int init_cnt = cnt;
2091 
2092         /* try and push anything in the part_buf */
2093         if (unlikely(host->part_buf_count)) {
2094                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2095 
2096                 buf += len;
2097                 cnt -= len;
2098                 if (host->part_buf_count == 4) {
2099                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2100                         host->part_buf_count = 0;
2101                 }
2102         }
2103 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2104         if (unlikely((unsigned long)buf & 0x3)) {
2105                 while (cnt >= 4) {
2106                         u32 aligned_buf[32];
2107                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2108                         int items = len >> 2;
2109                         int i;
2110                         /* memcpy from input buffer into aligned buffer */
2111                         memcpy(aligned_buf, buf, len);
2112                         buf += len;
2113                         cnt -= len;
2114                         /* push data from aligned buffer into fifo */
2115                         for (i = 0; i < items; ++i)
2116                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
2117                 }
2118         } else
2119 #endif
2120         {
2121                 u32 *pdata = buf;
2122 
2123                 for (; cnt >= 4; cnt -= 4)
2124                         mci_fifo_writel(host->fifo_reg, *pdata++);
2125                 buf = pdata;
2126         }
2127         /* put anything remaining in the part_buf */
2128         if (cnt) {
2129                 dw_mci_set_part_bytes(host, buf, cnt);
2130                  /* Push data if we have reached the expected data length */
2131                 if ((data->bytes_xfered + init_cnt) ==
2132                     (data->blksz * data->blocks))
2133                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
2134         }
2135 }
2136 
2137 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
2138 {
2139 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2140         if (unlikely((unsigned long)buf & 0x3)) {
2141                 while (cnt >= 4) {
2142                         /* pull data from fifo into aligned buffer */
2143                         u32 aligned_buf[32];
2144                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
2145                         int items = len >> 2;
2146                         int i;
2147 
2148                         for (i = 0; i < items; ++i)
2149                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
2150                         /* memcpy from aligned buffer into output buffer */
2151                         memcpy(buf, aligned_buf, len);
2152                         buf += len;
2153                         cnt -= len;
2154                 }
2155         } else
2156 #endif
2157         {
2158                 u32 *pdata = buf;
2159 
2160                 for (; cnt >= 4; cnt -= 4)
2161                         *pdata++ = mci_fifo_readl(host->fifo_reg);
2162                 buf = pdata;
2163         }
2164         if (cnt) {
2165                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
2166                 dw_mci_pull_final_bytes(host, buf, cnt);
2167         }
2168 }
2169 
2170 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
2171 {
2172         struct mmc_data *data = host->data;
2173         int init_cnt = cnt;
2174 
2175         /* try and push anything in the part_buf */
2176         if (unlikely(host->part_buf_count)) {
2177                 int len = dw_mci_push_part_bytes(host, buf, cnt);
2178 
2179                 buf += len;
2180                 cnt -= len;
2181 
2182                 if (host->part_buf_count == 8) {
2183                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2184                         host->part_buf_count = 0;
2185                 }
2186         }
2187 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2188         if (unlikely((unsigned long)buf & 0x7)) {
2189                 while (cnt >= 8) {
2190                         u64 aligned_buf[16];
2191                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2192                         int items = len >> 3;
2193                         int i;
2194                         /* memcpy from input buffer into aligned buffer */
2195                         memcpy(aligned_buf, buf, len);
2196                         buf += len;
2197                         cnt -= len;
2198                         /* push data from aligned buffer into fifo */
2199                         for (i = 0; i < items; ++i)
2200                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
2201                 }
2202         } else
2203 #endif
2204         {
2205                 u64 *pdata = buf;
2206 
2207                 for (; cnt >= 8; cnt -= 8)
2208                         mci_fifo_writeq(host->fifo_reg, *pdata++);
2209                 buf = pdata;
2210         }
2211         /* put anything remaining in the part_buf */
2212         if (cnt) {
2213                 dw_mci_set_part_bytes(host, buf, cnt);
2214                 /* Push data if we have reached the expected data length */
2215                 if ((data->bytes_xfered + init_cnt) ==
2216                     (data->blksz * data->blocks))
2217                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
2218         }
2219 }
2220 
2221 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
2222 {
2223 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
2224         if (unlikely((unsigned long)buf & 0x7)) {
2225                 while (cnt >= 8) {
2226                         /* pull data from fifo into aligned buffer */
2227                         u64 aligned_buf[16];
2228                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
2229                         int items = len >> 3;
2230                         int i;
2231 
2232                         for (i = 0; i < items; ++i)
2233                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
2234 
2235                         /* memcpy from aligned buffer into output buffer */
2236                         memcpy(buf, aligned_buf, len);
2237                         buf += len;
2238                         cnt -= len;
2239                 }
2240         } else
2241 #endif
2242         {
2243                 u64 *pdata = buf;
2244 
2245                 for (; cnt >= 8; cnt -= 8)
2246                         *pdata++ = mci_fifo_readq(host->fifo_reg);
2247                 buf = pdata;
2248         }
2249         if (cnt) {
2250                 host->part_buf = mci_fifo_readq(host->fifo_reg);
2251                 dw_mci_pull_final_bytes(host, buf, cnt);
2252         }
2253 }
2254 
2255 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2256 {
2257         int len;
2258 
2259         /* get remaining partial bytes */
2260         len = dw_mci_pull_part_bytes(host, buf, cnt);
2261         if (unlikely(len == cnt))
2262                 return;
2263         buf += len;
2264         cnt -= len;
2265 
2266         /* get the rest of the data */
2267         host->pull_data(host, buf, cnt);
2268 }
2269 
2270 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2271 {
2272         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2273         void *buf;
2274         unsigned int offset;
2275         struct mmc_data *data = host->data;
2276         int shift = host->data_shift;
2277         u32 status;
2278         unsigned int len;
2279         unsigned int remain, fcnt;
2280 
2281         do {
2282                 if (!sg_miter_next(sg_miter))
2283                         goto done;
2284 
2285                 host->sg = sg_miter->piter.sg;
2286                 buf = sg_miter->addr;
2287                 remain = sg_miter->length;
2288                 offset = 0;
2289 
2290                 do {
2291                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2292                                         << shift) + host->part_buf_count;
2293                         len = min(remain, fcnt);
2294                         if (!len)
2295                                 break;
2296                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2297                         data->bytes_xfered += len;
2298                         offset += len;
2299                         remain -= len;
2300                 } while (remain);
2301 
2302                 sg_miter->consumed = offset;
2303                 status = mci_readl(host, MINTSTS);
2304                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2305         /* if the RXDR is ready read again */
2306         } while ((status & SDMMC_INT_RXDR) ||
2307                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2308 
2309         if (!remain) {
2310                 if (!sg_miter_next(sg_miter))
2311                         goto done;
2312                 sg_miter->consumed = 0;
2313         }
2314         sg_miter_stop(sg_miter);
2315         return;
2316 
2317 done:
2318         sg_miter_stop(sg_miter);
2319         host->sg = NULL;
2320         smp_wmb(); /* drain writebuffer */
2321         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2322 }
2323 
2324 static void dw_mci_write_data_pio(struct dw_mci *host)
2325 {
2326         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2327         void *buf;
2328         unsigned int offset;
2329         struct mmc_data *data = host->data;
2330         int shift = host->data_shift;
2331         u32 status;
2332         unsigned int len;
2333         unsigned int fifo_depth = host->fifo_depth;
2334         unsigned int remain, fcnt;
2335 
2336         do {
2337                 if (!sg_miter_next(sg_miter))
2338                         goto done;
2339 
2340                 host->sg = sg_miter->piter.sg;
2341                 buf = sg_miter->addr;
2342                 remain = sg_miter->length;
2343                 offset = 0;
2344 
2345                 do {
2346                         fcnt = ((fifo_depth -
2347                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2348                                         << shift) - host->part_buf_count;
2349                         len = min(remain, fcnt);
2350                         if (!len)
2351                                 break;
2352                         host->push_data(host, (void *)(buf + offset), len);
2353                         data->bytes_xfered += len;
2354                         offset += len;
2355                         remain -= len;
2356                 } while (remain);
2357 
2358                 sg_miter->consumed = offset;
2359                 status = mci_readl(host, MINTSTS);
2360                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2361         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2362 
2363         if (!remain) {
2364                 if (!sg_miter_next(sg_miter))
2365                         goto done;
2366                 sg_miter->consumed = 0;
2367         }
2368         sg_miter_stop(sg_miter);
2369         return;
2370 
2371 done:
2372         sg_miter_stop(sg_miter);
2373         host->sg = NULL;
2374         smp_wmb(); /* drain writebuffer */
2375         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2376 }
2377 
2378 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2379 {
2380         if (!host->cmd_status)
2381                 host->cmd_status = status;
2382 
2383         smp_wmb(); /* drain writebuffer */
2384 
2385         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2386         tasklet_schedule(&host->tasklet);
2387 }
2388 
2389 static void dw_mci_handle_cd(struct dw_mci *host)
2390 {
2391         int i;
2392 
2393         for (i = 0; i < host->num_slots; i++) {
2394                 struct dw_mci_slot *slot = host->slot[i];
2395 
2396                 if (!slot)
2397                         continue;
2398 
2399                 if (slot->mmc->ops->card_event)
2400                         slot->mmc->ops->card_event(slot->mmc);
2401                 mmc_detect_change(slot->mmc,
2402                         msecs_to_jiffies(host->pdata->detect_delay_ms));
2403         }
2404 }
2405 
2406 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2407 {
2408         struct dw_mci *host = dev_id;
2409         u32 pending;
2410         int i;
2411 
2412         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2413 
2414         if (pending) {
2415                 /* Check volt switch first, since it can look like an error */
2416                 if ((host->state == STATE_SENDING_CMD11) &&
2417                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2418                         unsigned long irqflags;
2419 
2420                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2421                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2422 
2423                         /*
2424                          * Hold the lock; we know cmd11_timer can't be kicked
2425                          * off after the lock is released, so safe to delete.
2426                          */
2427                         spin_lock_irqsave(&host->irq_lock, irqflags);
2428                         dw_mci_cmd_interrupt(host, pending);
2429                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2430 
2431                         del_timer(&host->cmd11_timer);
2432                 }
2433 
2434                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2435                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2436                         host->cmd_status = pending;
2437                         smp_wmb(); /* drain writebuffer */
2438                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2439                 }
2440 
2441                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2442                         /* if there is an error report DATA_ERROR */
2443                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2444                         host->data_status = pending;
2445                         smp_wmb(); /* drain writebuffer */
2446                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2447                         tasklet_schedule(&host->tasklet);
2448                 }
2449 
2450                 if (pending & SDMMC_INT_DATA_OVER) {
2451                         del_timer(&host->dto_timer);
2452 
2453                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2454                         if (!host->data_status)
2455                                 host->data_status = pending;
2456                         smp_wmb(); /* drain writebuffer */
2457                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2458                                 if (host->sg != NULL)
2459                                         dw_mci_read_data_pio(host, true);
2460                         }
2461                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2462                         tasklet_schedule(&host->tasklet);
2463                 }
2464 
2465                 if (pending & SDMMC_INT_RXDR) {
2466                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2467                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2468                                 dw_mci_read_data_pio(host, false);
2469                 }
2470 
2471                 if (pending & SDMMC_INT_TXDR) {
2472                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2473                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2474                                 dw_mci_write_data_pio(host);
2475                 }
2476 
2477                 if (pending & SDMMC_INT_CMD_DONE) {
2478                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2479                         dw_mci_cmd_interrupt(host, pending);
2480                 }
2481 
2482                 if (pending & SDMMC_INT_CD) {
2483                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2484                         dw_mci_handle_cd(host);
2485                 }
2486 
2487                 /* Handle SDIO Interrupts */
2488                 for (i = 0; i < host->num_slots; i++) {
2489                         struct dw_mci_slot *slot = host->slot[i];
2490 
2491                         if (!slot)
2492                                 continue;
2493 
2494                         if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2495                                 mci_writel(host, RINTSTS,
2496                                            SDMMC_INT_SDIO(slot->sdio_id));
2497                                 mmc_signal_sdio_irq(slot->mmc);
2498                         }
2499                 }
2500 
2501         }
2502 
2503         if (host->use_dma != TRANS_MODE_IDMAC)
2504                 return IRQ_HANDLED;
2505 
2506         /* Handle IDMA interrupts */
2507         if (host->dma_64bit_address == 1) {
2508                 pending = mci_readl(host, IDSTS64);
2509                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2510                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2511                                                         SDMMC_IDMAC_INT_RI);
2512                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2513                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2514                                 host->dma_ops->complete((void *)host);
2515                 }
2516         } else {
2517                 pending = mci_readl(host, IDSTS);
2518                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2519                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2520                                                         SDMMC_IDMAC_INT_RI);
2521                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2522                         if (!test_bit(EVENT_DATA_ERROR, &host->pending_events))
2523                                 host->dma_ops->complete((void *)host);
2524                 }
2525         }
2526 
2527         return IRQ_HANDLED;
2528 }
2529 
2530 #ifdef CONFIG_OF
2531 /* given a slot, find out the device node representing that slot */
2532 static struct device_node *dw_mci_of_find_slot_node(struct dw_mci_slot *slot)
2533 {
2534         struct device *dev = slot->mmc->parent;
2535         struct device_node *np;
2536         const __be32 *addr;
2537         int len;
2538 
2539         if (!dev || !dev->of_node)
2540                 return NULL;
2541 
2542         for_each_child_of_node(dev->of_node, np) {
2543                 addr = of_get_property(np, "reg", &len);
2544                 if (!addr || (len < sizeof(int)))
2545                         continue;
2546                 if (be32_to_cpup(addr) == slot->id)
2547                         return np;
2548         }
2549         return NULL;
2550 }
2551 
2552 static void dw_mci_slot_of_parse(struct dw_mci_slot *slot)
2553 {
2554         struct device_node *np = dw_mci_of_find_slot_node(slot);
2555 
2556         if (!np)
2557                 return;
2558 
2559         if (of_property_read_bool(np, "disable-wp")) {
2560                 slot->mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
2561                 dev_warn(slot->mmc->parent,
2562                         "Slot quirk 'disable-wp' is deprecated\n");
2563         }
2564 }
2565 #else /* CONFIG_OF */
2566 static void dw_mci_slot_of_parse(struct dw_mci_slot *slot)
2567 {
2568 }
2569 #endif /* CONFIG_OF */
2570 
2571 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2572 {
2573         struct mmc_host *mmc;
2574         struct dw_mci_slot *slot;
2575         const struct dw_mci_drv_data *drv_data = host->drv_data;
2576         int ctrl_id, ret;
2577         u32 freq[2];
2578 
2579         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2580         if (!mmc)
2581                 return -ENOMEM;
2582 
2583         slot = mmc_priv(mmc);
2584         slot->id = id;
2585         slot->sdio_id = host->sdio_id0 + id;
2586         slot->mmc = mmc;
2587         slot->host = host;
2588         host->slot[id] = slot;
2589 
2590         mmc->ops = &dw_mci_ops;
2591         if (of_property_read_u32_array(host->dev->of_node,
2592                                        "clock-freq-min-max", freq, 2)) {
2593                 mmc->f_min = DW_MCI_FREQ_MIN;
2594                 mmc->f_max = DW_MCI_FREQ_MAX;
2595         } else {
2596                 mmc->f_min = freq[0];
2597                 mmc->f_max = freq[1];
2598         }
2599 
2600         /*if there are external regulators, get them*/
2601         ret = mmc_regulator_get_supply(mmc);
2602         if (ret == -EPROBE_DEFER)
2603                 goto err_host_allocated;
2604 
2605         if (!mmc->ocr_avail)
2606                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2607 
2608         if (host->pdata->caps)
2609                 mmc->caps = host->pdata->caps;
2610 
2611         /*
2612          * Support MMC_CAP_ERASE by default.
2613          * It needs to use trim/discard/erase commands.
2614          */
2615         mmc->caps |= MMC_CAP_ERASE;
2616 
2617         if (host->pdata->pm_caps)
2618                 mmc->pm_caps = host->pdata->pm_caps;
2619 
2620         if (host->dev->of_node) {
2621                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2622                 if (ctrl_id < 0)
2623                         ctrl_id = 0;
2624         } else {
2625                 ctrl_id = to_platform_device(host->dev)->id;
2626         }
2627         if (drv_data && drv_data->caps)
2628                 mmc->caps |= drv_data->caps[ctrl_id];
2629 
2630         if (host->pdata->caps2)
2631                 mmc->caps2 = host->pdata->caps2;
2632 
2633         dw_mci_slot_of_parse(slot);
2634 
2635         ret = mmc_of_parse(mmc);
2636         if (ret)
2637                 goto err_host_allocated;
2638 
2639         /* Useful defaults if platform data is unset. */
2640         if (host->use_dma == TRANS_MODE_IDMAC) {
2641                 mmc->max_segs = host->ring_size;
2642                 mmc->max_blk_size = 65535;
2643                 mmc->max_seg_size = 0x1000;
2644                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2645                 mmc->max_blk_count = mmc->max_req_size / 512;
2646         } else if (host->use_dma == TRANS_MODE_EDMAC) {
2647                 mmc->max_segs = 64;
2648                 mmc->max_blk_size = 65535;
2649                 mmc->max_blk_count = 65535;
2650                 mmc->max_req_size =
2651                                 mmc->max_blk_size * mmc->max_blk_count;
2652                 mmc->max_seg_size = mmc->max_req_size;
2653         } else {
2654                 /* TRANS_MODE_PIO */
2655                 mmc->max_segs = 64;
2656                 mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */
2657                 mmc->max_blk_count = 512;
2658                 mmc->max_req_size = mmc->max_blk_size *
2659                                     mmc->max_blk_count;
2660                 mmc->max_seg_size = mmc->max_req_size;
2661         }
2662 
2663         dw_mci_get_cd(mmc);
2664 
2665         ret = mmc_add_host(mmc);
2666         if (ret)
2667                 goto err_host_allocated;
2668 
2669 #if defined(CONFIG_DEBUG_FS)
2670         dw_mci_init_debugfs(slot);
2671 #endif
2672 
2673         return 0;
2674 
2675 err_host_allocated:
2676         mmc_free_host(mmc);
2677         return ret;
2678 }
2679 
2680 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2681 {
2682         /* Debugfs stuff is cleaned up by mmc core */
2683         mmc_remove_host(slot->mmc);
2684         slot->host->slot[id] = NULL;
2685         mmc_free_host(slot->mmc);
2686 }
2687 
2688 static void dw_mci_init_dma(struct dw_mci *host)
2689 {
2690         int addr_config;
2691         struct device *dev = host->dev;
2692         struct device_node *np = dev->of_node;
2693 
2694         /*
2695         * Check tansfer mode from HCON[17:16]
2696         * Clear the ambiguous description of dw_mmc databook:
2697         * 2b'00: No DMA Interface -> Actually means using Internal DMA block
2698         * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block
2699         * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block
2700         * 2b'11: Non DW DMA Interface -> pio only
2701         * Compared to DesignWare DMA Interface, Generic DMA Interface has a
2702         * simpler request/acknowledge handshake mechanism and both of them
2703         * are regarded as external dma master for dw_mmc.
2704         */
2705         host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON));
2706         if (host->use_dma == DMA_INTERFACE_IDMA) {
2707                 host->use_dma = TRANS_MODE_IDMAC;
2708         } else if (host->use_dma == DMA_INTERFACE_DWDMA ||
2709                    host->use_dma == DMA_INTERFACE_GDMA) {
2710                 host->use_dma = TRANS_MODE_EDMAC;
2711         } else {
2712                 goto no_dma;
2713         }
2714 
2715         /* Determine which DMA interface to use */
2716         if (host->use_dma == TRANS_MODE_IDMAC) {
2717                 /*
2718                 * Check ADDR_CONFIG bit in HCON to find
2719                 * IDMAC address bus width
2720                 */
2721                 addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON));
2722 
2723                 if (addr_config == 1) {
2724                         /* host supports IDMAC in 64-bit address mode */
2725                         host->dma_64bit_address = 1;
2726                         dev_info(host->dev,
2727                                  "IDMAC supports 64-bit address mode.\n");
2728                         if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2729                                 dma_set_coherent_mask(host->dev,
2730                                                       DMA_BIT_MASK(64));
2731                 } else {
2732                         /* host supports IDMAC in 32-bit address mode */
2733                         host->dma_64bit_address = 0;
2734                         dev_info(host->dev,
2735                                  "IDMAC supports 32-bit address mode.\n");
2736                 }
2737 
2738                 /* Alloc memory for sg translation */
2739                 host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2740                                                    &host->sg_dma, GFP_KERNEL);
2741                 if (!host->sg_cpu) {
2742                         dev_err(host->dev,
2743                                 "%s: could not alloc DMA memory\n",
2744                                 __func__);
2745                         goto no_dma;
2746                 }
2747 
2748                 host->dma_ops = &dw_mci_idmac_ops;
2749                 dev_info(host->dev, "Using internal DMA controller.\n");
2750         } else {
2751                 /* TRANS_MODE_EDMAC: check dma bindings again */
2752                 if ((of_property_count_strings(np, "dma-names") < 0) ||
2753                     (!of_find_property(np, "dmas", NULL))) {
2754                         goto no_dma;
2755                 }
2756                 host->dma_ops = &dw_mci_edmac_ops;
2757                 dev_info(host->dev, "Using external DMA controller.\n");
2758         }
2759 
2760         if (host->dma_ops->init && host->dma_ops->start &&
2761             host->dma_ops->stop && host->dma_ops->cleanup) {
2762                 if (host->dma_ops->init(host)) {
2763                         dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n",
2764                                 __func__);
2765                         goto no_dma;
2766                 }
2767         } else {
2768                 dev_err(host->dev, "DMA initialization not found.\n");
2769                 goto no_dma;
2770         }
2771 
2772         return;
2773 
2774 no_dma:
2775         dev_info(host->dev, "Using PIO mode.\n");
2776         host->use_dma = TRANS_MODE_PIO;
2777 }
2778 
2779 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2780 {
2781         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2782         u32 ctrl;
2783 
2784         ctrl = mci_readl(host, CTRL);
2785         ctrl |= reset;
2786         mci_writel(host, CTRL, ctrl);
2787 
2788         /* wait till resets clear */
2789         do {
2790                 ctrl = mci_readl(host, CTRL);
2791                 if (!(ctrl & reset))
2792                         return true;
2793         } while (time_before(jiffies, timeout));
2794 
2795         dev_err(host->dev,
2796                 "Timeout resetting block (ctrl reset %#x)\n",
2797                 ctrl & reset);
2798 
2799         return false;
2800 }
2801 
2802 static bool dw_mci_reset(struct dw_mci *host)
2803 {
2804         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2805         bool ret = false;
2806 
2807         /*
2808          * Reseting generates a block interrupt, hence setting
2809          * the scatter-gather pointer to NULL.
2810          */
2811         if (host->sg) {
2812                 sg_miter_stop(&host->sg_miter);
2813                 host->sg = NULL;
2814         }
2815 
2816         if (host->use_dma)
2817                 flags |= SDMMC_CTRL_DMA_RESET;
2818 
2819         if (dw_mci_ctrl_reset(host, flags)) {
2820                 /*
2821                  * In all cases we clear the RAWINTS register to clear any
2822                  * interrupts.
2823                  */
2824                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2825 
2826                 /* if using dma we wait for dma_req to clear */
2827                 if (host->use_dma) {
2828                         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2829                         u32 status;
2830 
2831                         do {
2832                                 status = mci_readl(host, STATUS);
2833                                 if (!(status & SDMMC_STATUS_DMA_REQ))
2834                                         break;
2835                                 cpu_relax();
2836                         } while (time_before(jiffies, timeout));
2837 
2838                         if (status & SDMMC_STATUS_DMA_REQ) {
2839                                 dev_err(host->dev,
2840                                         "%s: Timeout waiting for dma_req to clear during reset\n",
2841                                         __func__);
2842                                 goto ciu_out;
2843                         }
2844 
2845                         /* when using DMA next we reset the fifo again */
2846                         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2847                                 goto ciu_out;
2848                 }
2849         } else {
2850                 /* if the controller reset bit did clear, then set clock regs */
2851                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2852                         dev_err(host->dev,
2853                                 "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n",
2854                                 __func__);
2855                         goto ciu_out;
2856                 }
2857         }
2858 
2859         if (host->use_dma == TRANS_MODE_IDMAC)
2860                 /* It is also recommended that we reset and reprogram idmac */
2861                 dw_mci_idmac_reset(host);
2862 
2863         ret = true;
2864 
2865 ciu_out:
2866         /* After a CTRL reset we need to have CIU set clock registers  */
2867         mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2868 
2869         return ret;
2870 }
2871 
2872 static void dw_mci_cmd11_timer(unsigned long arg)
2873 {
2874         struct dw_mci *host = (struct dw_mci *)arg;
2875 
2876         if (host->state != STATE_SENDING_CMD11) {
2877                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
2878                 return;
2879         }
2880 
2881         host->cmd_status = SDMMC_INT_RTO;
2882         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2883         tasklet_schedule(&host->tasklet);
2884 }
2885 
2886 static void dw_mci_dto_timer(unsigned long arg)
2887 {
2888         struct dw_mci *host = (struct dw_mci *)arg;
2889 
2890         switch (host->state) {
2891         case STATE_SENDING_DATA:
2892         case STATE_DATA_BUSY:
2893                 /*
2894                  * If DTO interrupt does NOT come in sending data state,
2895                  * we should notify the driver to terminate current transfer
2896                  * and report a data timeout to the core.
2897                  */
2898                 host->data_status = SDMMC_INT_DRTO;
2899                 set_bit(EVENT_DATA_ERROR, &host->pending_events);
2900                 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2901                 tasklet_schedule(&host->tasklet);
2902                 break;
2903         default:
2904                 break;
2905         }
2906 }
2907 
2908 #ifdef CONFIG_OF
2909 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2910 {
2911         struct dw_mci_board *pdata;
2912         struct device *dev = host->dev;
2913         struct device_node *np = dev->of_node;
2914         const struct dw_mci_drv_data *drv_data = host->drv_data;
2915         int ret;
2916         u32 clock_frequency;
2917 
2918         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2919         if (!pdata)
2920                 return ERR_PTR(-ENOMEM);
2921 
2922         /* find out number of slots supported */
2923         of_property_read_u32(np, "num-slots", &pdata->num_slots);
2924 
2925         if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2926                 dev_info(dev,
2927                          "fifo-depth property not found, using value of FIFOTH register as default\n");
2928 
2929         of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2930 
2931         if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2932                 pdata->bus_hz = clock_frequency;
2933 
2934         if (drv_data && drv_data->parse_dt) {
2935                 ret = drv_data->parse_dt(host);
2936                 if (ret)
2937                         return ERR_PTR(ret);
2938         }
2939 
2940         if (of_find_property(np, "supports-highspeed", NULL)) {
2941                 dev_info(dev, "supports-highspeed property is deprecated.\n");
2942                 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2943         }
2944 
2945         return pdata;
2946 }
2947 
2948 #else /* CONFIG_OF */
2949 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2950 {
2951         return ERR_PTR(-EINVAL);
2952 }
2953 #endif /* CONFIG_OF */
2954 
2955 static void dw_mci_enable_cd(struct dw_mci *host)
2956 {
2957         unsigned long irqflags;
2958         u32 temp;
2959         int i;
2960         struct dw_mci_slot *slot;
2961 
2962         /*
2963          * No need for CD if all slots have a non-error GPIO
2964          * as well as broken card detection is found.
2965          */
2966         for (i = 0; i < host->num_slots; i++) {
2967                 slot = host->slot[i];
2968                 if (slot->mmc->caps & MMC_CAP_NEEDS_POLL)
2969                         return;
2970 
2971                 if (mmc_gpio_get_cd(slot->mmc) < 0)
2972                         break;
2973         }
2974         if (i == host->num_slots)
2975                 return;
2976 
2977         spin_lock_irqsave(&host->irq_lock, irqflags);
2978         temp = mci_readl(host, INTMASK);
2979         temp  |= SDMMC_INT_CD;
2980         mci_writel(host, INTMASK, temp);
2981         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2982 }
2983 
2984 int dw_mci_probe(struct dw_mci *host)
2985 {
2986         const struct dw_mci_drv_data *drv_data = host->drv_data;
2987         int width, i, ret = 0;
2988         u32 fifo_size;
2989         int init_slots = 0;
2990 
2991         if (!host->pdata) {
2992                 host->pdata = dw_mci_parse_dt(host);
2993                 if (IS_ERR(host->pdata)) {
2994                         dev_err(host->dev, "platform data not available\n");
2995                         return -EINVAL;
2996                 }
2997         }
2998 
2999         host->biu_clk = devm_clk_get(host->dev, "biu");
3000         if (IS_ERR(host->biu_clk)) {
3001                 dev_dbg(host->dev, "biu clock not available\n");
3002         } else {
3003                 ret = clk_prepare_enable(host->biu_clk);
3004                 if (ret) {
3005                         dev_err(host->dev, "failed to enable biu clock\n");
3006                         return ret;
3007                 }
3008         }
3009 
3010         host->ciu_clk = devm_clk_get(host->dev, "ciu");
3011         if (IS_ERR(host->ciu_clk)) {
3012                 dev_dbg(host->dev, "ciu clock not available\n");
3013                 host->bus_hz = host->pdata->bus_hz;
3014         } else {
3015                 ret = clk_prepare_enable(host->ciu_clk);
3016                 if (ret) {
3017                         dev_err(host->dev, "failed to enable ciu clock\n");
3018                         goto err_clk_biu;
3019                 }
3020 
3021                 if (host->pdata->bus_hz) {
3022                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
3023                         if (ret)
3024                                 dev_warn(host->dev,
3025                                          "Unable to set bus rate to %uHz\n",
3026                                          host->pdata->bus_hz);
3027                 }
3028                 host->bus_hz = clk_get_rate(host->ciu_clk);
3029         }
3030 
3031         if (!host->bus_hz) {
3032                 dev_err(host->dev,
3033                         "Platform data must supply bus speed\n");
3034                 ret = -ENODEV;
3035                 goto err_clk_ciu;
3036         }
3037 
3038         if (drv_data && drv_data->init) {
3039                 ret = drv_data->init(host);
3040                 if (ret) {
3041                         dev_err(host->dev,
3042                                 "implementation specific init failed\n");
3043                         goto err_clk_ciu;
3044                 }
3045         }
3046 
3047         setup_timer(&host->cmd11_timer,
3048                     dw_mci_cmd11_timer, (unsigned long)host);
3049 
3050         setup_timer(&host->dto_timer,
3051                     dw_mci_dto_timer, (unsigned long)host);
3052 
3053         spin_lock_init(&host->lock);
3054         spin_lock_init(&host->irq_lock);
3055         INIT_LIST_HEAD(&host->queue);
3056 
3057         /*
3058          * Get the host data width - this assumes that HCON has been set with
3059          * the correct values.
3060          */
3061         i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON));
3062         if (!i) {
3063                 host->push_data = dw_mci_push_data16;
3064                 host->pull_data = dw_mci_pull_data16;
3065                 width = 16;
3066                 host->data_shift = 1;
3067         } else if (i == 2) {
3068                 host->push_data = dw_mci_push_data64;
3069                 host->pull_data = dw_mci_pull_data64;
3070                 width = 64;
3071                 host->data_shift = 3;
3072         } else {
3073                 /* Check for a reserved value, and warn if it is */
3074                 WARN((i != 1),
3075                      "HCON reports a reserved host data width!\n"
3076                      "Defaulting to 32-bit access.\n");
3077                 host->push_data = dw_mci_push_data32;
3078                 host->pull_data = dw_mci_pull_data32;
3079                 width = 32;
3080                 host->data_shift = 2;
3081         }
3082 
3083         /* Reset all blocks */
3084         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3085                 ret = -ENODEV;
3086                 goto err_clk_ciu;
3087         }
3088 
3089         host->dma_ops = host->pdata->dma_ops;
3090         dw_mci_init_dma(host);
3091 
3092         /* Clear the interrupts for the host controller */
3093         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3094         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3095 
3096         /* Put in max timeout */
3097         mci_writel(host, TMOUT, 0xFFFFFFFF);
3098 
3099         /*
3100          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
3101          *                          Tx Mark = fifo_size / 2 DMA Size = 8
3102          */
3103         if (!host->pdata->fifo_depth) {
3104                 /*
3105                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
3106                  * have been overwritten by the bootloader, just like we're
3107                  * about to do, so if you know the value for your hardware, you
3108                  * should put it in the platform data.
3109                  */
3110                 fifo_size = mci_readl(host, FIFOTH);
3111                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
3112         } else {
3113                 fifo_size = host->pdata->fifo_depth;
3114         }
3115         host->fifo_depth = fifo_size;
3116         host->fifoth_val =
3117                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
3118         mci_writel(host, FIFOTH, host->fifoth_val);
3119 
3120         /* disable clock to CIU */
3121         mci_writel(host, CLKENA, 0);
3122         mci_writel(host, CLKSRC, 0);
3123 
3124         /*
3125          * In 2.40a spec, Data offset is changed.
3126          * Need to check the version-id and set data-offset for DATA register.
3127          */
3128         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
3129         dev_info(host->dev, "Version ID is %04x\n", host->verid);
3130 
3131         if (host->verid < DW_MMC_240A)
3132                 host->fifo_reg = host->regs + DATA_OFFSET;
3133         else
3134                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
3135 
3136         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
3137         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
3138                                host->irq_flags, "dw-mci", host);
3139         if (ret)
3140                 goto err_dmaunmap;
3141 
3142         if (host->pdata->num_slots)
3143                 host->num_slots = host->pdata->num_slots;
3144         else
3145                 host->num_slots = 1;
3146 
3147         if (host->num_slots < 1 ||
3148             host->num_slots > SDMMC_GET_SLOT_NUM(mci_readl(host, HCON))) {
3149                 dev_err(host->dev,
3150                         "Platform data must supply correct num_slots.\n");
3151                 ret = -ENODEV;
3152                 goto err_clk_ciu;
3153         }
3154 
3155         /*
3156          * Enable interrupts for command done, data over, data empty,
3157          * receive ready and error such as transmit, receive timeout, crc error
3158          */
3159         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3160                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3161                    DW_MCI_ERROR_FLAGS);
3162         /* Enable mci interrupt */
3163         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3164 
3165         dev_info(host->dev,
3166                  "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n",
3167                  host->irq, width, fifo_size);
3168 
3169         /* We need at least one slot to succeed */
3170         for (i = 0; i < host->num_slots; i++) {
3171                 ret = dw_mci_init_slot(host, i);
3172                 if (ret)
3173                         dev_dbg(host->dev, "slot %d init failed\n", i);
3174                 else
3175                         init_slots++;
3176         }
3177 
3178         if (init_slots) {
3179                 dev_info(host->dev, "%d slots initialized\n", init_slots);
3180         } else {
3181                 dev_dbg(host->dev,
3182                         "attempted to initialize %d slots, but failed on all\n",
3183                         host->num_slots);
3184                 goto err_dmaunmap;
3185         }
3186 
3187         /* Now that slots are all setup, we can enable card detect */
3188         dw_mci_enable_cd(host);
3189 
3190         return 0;
3191 
3192 err_dmaunmap:
3193         if (host->use_dma && host->dma_ops->exit)
3194                 host->dma_ops->exit(host);
3195 
3196 err_clk_ciu:
3197         if (!IS_ERR(host->ciu_clk))
3198                 clk_disable_unprepare(host->ciu_clk);
3199 
3200 err_clk_biu:
3201         if (!IS_ERR(host->biu_clk))
3202                 clk_disable_unprepare(host->biu_clk);
3203 
3204         return ret;
3205 }
3206 EXPORT_SYMBOL(dw_mci_probe);
3207 
3208 void dw_mci_remove(struct dw_mci *host)
3209 {
3210         int i;
3211 
3212         for (i = 0; i < host->num_slots; i++) {
3213                 dev_dbg(host->dev, "remove slot %d\n", i);
3214                 if (host->slot[i])
3215                         dw_mci_cleanup_slot(host->slot[i], i);
3216         }
3217 
3218         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3219         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
3220 
3221         /* disable clock to CIU */
3222         mci_writel(host, CLKENA, 0);
3223         mci_writel(host, CLKSRC, 0);
3224 
3225         if (host->use_dma && host->dma_ops->exit)
3226                 host->dma_ops->exit(host);
3227 
3228         if (!IS_ERR(host->ciu_clk))
3229                 clk_disable_unprepare(host->ciu_clk);
3230 
3231         if (!IS_ERR(host->biu_clk))
3232                 clk_disable_unprepare(host->biu_clk);
3233 }
3234 EXPORT_SYMBOL(dw_mci_remove);
3235 
3236 
3237 
3238 #ifdef CONFIG_PM_SLEEP
3239 /*
3240  * TODO: we should probably disable the clock to the card in the suspend path.
3241  */
3242 int dw_mci_suspend(struct dw_mci *host)
3243 {
3244         if (host->use_dma && host->dma_ops->exit)
3245                 host->dma_ops->exit(host);
3246 
3247         return 0;
3248 }
3249 EXPORT_SYMBOL(dw_mci_suspend);
3250 
3251 int dw_mci_resume(struct dw_mci *host)
3252 {
3253         int i, ret;
3254 
3255         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
3256                 ret = -ENODEV;
3257                 return ret;
3258         }
3259 
3260         if (host->use_dma && host->dma_ops->init)
3261                 host->dma_ops->init(host);
3262 
3263         /*
3264          * Restore the initial value at FIFOTH register
3265          * And Invalidate the prev_blksz with zero
3266          */
3267         mci_writel(host, FIFOTH, host->fifoth_val);
3268         host->prev_blksz = 0;
3269 
3270         /* Put in max timeout */
3271         mci_writel(host, TMOUT, 0xFFFFFFFF);
3272 
3273         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3274         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3275                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3276                    DW_MCI_ERROR_FLAGS);
3277         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3278 
3279         for (i = 0; i < host->num_slots; i++) {
3280                 struct dw_mci_slot *slot = host->slot[i];
3281 
3282                 if (!slot)
3283                         continue;
3284                 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
3285                         dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
3286                         dw_mci_setup_bus(slot, true);
3287                 }
3288         }
3289 
3290         /* Now that slots are all setup, we can enable card detect */
3291         dw_mci_enable_cd(host);
3292 
3293         return 0;
3294 }
3295 EXPORT_SYMBOL(dw_mci_resume);
3296 #endif /* CONFIG_PM_SLEEP */
3297 
3298 static int __init dw_mci_init(void)
3299 {
3300         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3301         return 0;
3302 }
3303 
3304 static void __exit dw_mci_exit(void)
3305 {
3306 }
3307 
3308 module_init(dw_mci_init);
3309 module_exit(dw_mci_exit);
3310 
3311 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3312 MODULE_AUTHOR("NXP Semiconductor VietNam");
3313 MODULE_AUTHOR("Imagination Technologies Ltd");
3314 MODULE_LICENSE("GPL v2");
3315 

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