Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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)
 48 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
 49                                  SDMMC_INT_RESP_ERR)
 50 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
 51                                  DW_MCI_CMD_ERROR_FLAGS  | SDMMC_INT_HLE)
 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 #ifdef CONFIG_MMC_DW_IDMAC
 60 #define IDMAC_INT_CLR           (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
 61                                  SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
 62                                  SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
 63                                  SDMMC_IDMAC_INT_TI)
 64 
 65 struct idmac_desc_64addr {
 66         u32             des0;   /* Control Descriptor */
 67 
 68         u32             des1;   /* Reserved */
 69 
 70         u32             des2;   /*Buffer sizes */
 71 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
 72         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
 73          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
 74 
 75         u32             des3;   /* Reserved */
 76 
 77         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
 78         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
 79 
 80         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
 81         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
 82 };
 83 
 84 struct idmac_desc {
 85         __le32          des0;   /* Control Descriptor */
 86 #define IDMAC_DES0_DIC  BIT(1)
 87 #define IDMAC_DES0_LD   BIT(2)
 88 #define IDMAC_DES0_FD   BIT(3)
 89 #define IDMAC_DES0_CH   BIT(4)
 90 #define IDMAC_DES0_ER   BIT(5)
 91 #define IDMAC_DES0_CES  BIT(30)
 92 #define IDMAC_DES0_OWN  BIT(31)
 93 
 94         __le32          des1;   /* Buffer sizes */
 95 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 96         ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
 97 
 98         __le32          des2;   /* buffer 1 physical address */
 99 
100         __le32          des3;   /* buffer 2 physical address */
101 };
102 #endif /* CONFIG_MMC_DW_IDMAC */
103 
104 static bool dw_mci_reset(struct dw_mci *host);
105 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
106 static int dw_mci_card_busy(struct mmc_host *mmc);
107 
108 #if defined(CONFIG_DEBUG_FS)
109 static int dw_mci_req_show(struct seq_file *s, void *v)
110 {
111         struct dw_mci_slot *slot = s->private;
112         struct mmc_request *mrq;
113         struct mmc_command *cmd;
114         struct mmc_command *stop;
115         struct mmc_data *data;
116 
117         /* Make sure we get a consistent snapshot */
118         spin_lock_bh(&slot->host->lock);
119         mrq = slot->mrq;
120 
121         if (mrq) {
122                 cmd = mrq->cmd;
123                 data = mrq->data;
124                 stop = mrq->stop;
125 
126                 if (cmd)
127                         seq_printf(s,
128                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
129                                    cmd->opcode, cmd->arg, cmd->flags,
130                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
131                                    cmd->resp[2], cmd->error);
132                 if (data)
133                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
134                                    data->bytes_xfered, data->blocks,
135                                    data->blksz, data->flags, data->error);
136                 if (stop)
137                         seq_printf(s,
138                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
139                                    stop->opcode, stop->arg, stop->flags,
140                                    stop->resp[0], stop->resp[1], stop->resp[2],
141                                    stop->resp[2], stop->error);
142         }
143 
144         spin_unlock_bh(&slot->host->lock);
145 
146         return 0;
147 }
148 
149 static int dw_mci_req_open(struct inode *inode, struct file *file)
150 {
151         return single_open(file, dw_mci_req_show, inode->i_private);
152 }
153 
154 static const struct file_operations dw_mci_req_fops = {
155         .owner          = THIS_MODULE,
156         .open           = dw_mci_req_open,
157         .read           = seq_read,
158         .llseek         = seq_lseek,
159         .release        = single_release,
160 };
161 
162 static int dw_mci_regs_show(struct seq_file *s, void *v)
163 {
164         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
165         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
166         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
167         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
168         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
169         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
170 
171         return 0;
172 }
173 
174 static int dw_mci_regs_open(struct inode *inode, struct file *file)
175 {
176         return single_open(file, dw_mci_regs_show, inode->i_private);
177 }
178 
179 static const struct file_operations dw_mci_regs_fops = {
180         .owner          = THIS_MODULE,
181         .open           = dw_mci_regs_open,
182         .read           = seq_read,
183         .llseek         = seq_lseek,
184         .release        = single_release,
185 };
186 
187 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
188 {
189         struct mmc_host *mmc = slot->mmc;
190         struct dw_mci *host = slot->host;
191         struct dentry *root;
192         struct dentry *node;
193 
194         root = mmc->debugfs_root;
195         if (!root)
196                 return;
197 
198         node = debugfs_create_file("regs", S_IRUSR, root, host,
199                                    &dw_mci_regs_fops);
200         if (!node)
201                 goto err;
202 
203         node = debugfs_create_file("req", S_IRUSR, root, slot,
204                                    &dw_mci_req_fops);
205         if (!node)
206                 goto err;
207 
208         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
209         if (!node)
210                 goto err;
211 
212         node = debugfs_create_x32("pending_events", S_IRUSR, root,
213                                   (u32 *)&host->pending_events);
214         if (!node)
215                 goto err;
216 
217         node = debugfs_create_x32("completed_events", S_IRUSR, root,
218                                   (u32 *)&host->completed_events);
219         if (!node)
220                 goto err;
221 
222         return;
223 
224 err:
225         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
226 }
227 #endif /* defined(CONFIG_DEBUG_FS) */
228 
229 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
230 
231 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
232 {
233         struct mmc_data *data;
234         struct dw_mci_slot *slot = mmc_priv(mmc);
235         struct dw_mci *host = slot->host;
236         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
237         u32 cmdr;
238         cmd->error = -EINPROGRESS;
239 
240         cmdr = cmd->opcode;
241 
242         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
243             cmd->opcode == MMC_GO_IDLE_STATE ||
244             cmd->opcode == MMC_GO_INACTIVE_STATE ||
245             (cmd->opcode == SD_IO_RW_DIRECT &&
246              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
247                 cmdr |= SDMMC_CMD_STOP;
248         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
249                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
250 
251         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
252                 u32 clk_en_a;
253 
254                 /* Special bit makes CMD11 not die */
255                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
256 
257                 /* Change state to continue to handle CMD11 weirdness */
258                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
259                 slot->host->state = STATE_SENDING_CMD11;
260 
261                 /*
262                  * We need to disable low power mode (automatic clock stop)
263                  * while doing voltage switch so we don't confuse the card,
264                  * since stopping the clock is a specific part of the UHS
265                  * voltage change dance.
266                  *
267                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
268                  * unconditionally turned back on in dw_mci_setup_bus() if it's
269                  * ever called with a non-zero clock.  That shouldn't happen
270                  * until the voltage change is all done.
271                  */
272                 clk_en_a = mci_readl(host, CLKENA);
273                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
274                 mci_writel(host, CLKENA, clk_en_a);
275                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
276                              SDMMC_CMD_PRV_DAT_WAIT, 0);
277         }
278 
279         if (cmd->flags & MMC_RSP_PRESENT) {
280                 /* We expect a response, so set this bit */
281                 cmdr |= SDMMC_CMD_RESP_EXP;
282                 if (cmd->flags & MMC_RSP_136)
283                         cmdr |= SDMMC_CMD_RESP_LONG;
284         }
285 
286         if (cmd->flags & MMC_RSP_CRC)
287                 cmdr |= SDMMC_CMD_RESP_CRC;
288 
289         data = cmd->data;
290         if (data) {
291                 cmdr |= SDMMC_CMD_DAT_EXP;
292                 if (data->flags & MMC_DATA_STREAM)
293                         cmdr |= SDMMC_CMD_STRM_MODE;
294                 if (data->flags & MMC_DATA_WRITE)
295                         cmdr |= SDMMC_CMD_DAT_WR;
296         }
297 
298         if (drv_data && drv_data->prepare_command)
299                 drv_data->prepare_command(slot->host, &cmdr);
300 
301         return cmdr;
302 }
303 
304 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
305 {
306         struct mmc_command *stop;
307         u32 cmdr;
308 
309         if (!cmd->data)
310                 return 0;
311 
312         stop = &host->stop_abort;
313         cmdr = cmd->opcode;
314         memset(stop, 0, sizeof(struct mmc_command));
315 
316         if (cmdr == MMC_READ_SINGLE_BLOCK ||
317             cmdr == MMC_READ_MULTIPLE_BLOCK ||
318             cmdr == MMC_WRITE_BLOCK ||
319             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
320             cmdr == MMC_SEND_TUNING_BLOCK ||
321             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
322                 stop->opcode = MMC_STOP_TRANSMISSION;
323                 stop->arg = 0;
324                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
325         } else if (cmdr == SD_IO_RW_EXTENDED) {
326                 stop->opcode = SD_IO_RW_DIRECT;
327                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
328                              ((cmd->arg >> 28) & 0x7);
329                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
330         } else {
331                 return 0;
332         }
333 
334         cmdr = stop->opcode | SDMMC_CMD_STOP |
335                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
336 
337         return cmdr;
338 }
339 
340 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
341 {
342         unsigned long timeout = jiffies + msecs_to_jiffies(500);
343 
344         /*
345          * Databook says that before issuing a new data transfer command
346          * we need to check to see if the card is busy.  Data transfer commands
347          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
348          *
349          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
350          * expected.
351          */
352         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
353             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
354                 while (mci_readl(host, STATUS) & SDMMC_STATUS_BUSY) {
355                         if (time_after(jiffies, timeout)) {
356                                 /* Command will fail; we'll pass error then */
357                                 dev_err(host->dev, "Busy; trying anyway\n");
358                                 break;
359                         }
360                         udelay(10);
361                 }
362         }
363 }
364 
365 static void dw_mci_start_command(struct dw_mci *host,
366                                  struct mmc_command *cmd, u32 cmd_flags)
367 {
368         host->cmd = cmd;
369         dev_vdbg(host->dev,
370                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
371                  cmd->arg, cmd_flags);
372 
373         mci_writel(host, CMDARG, cmd->arg);
374         wmb();
375         dw_mci_wait_while_busy(host, cmd_flags);
376 
377         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
378 }
379 
380 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
381 {
382         struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
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 #ifdef CONFIG_MMC_DW_IDMAC
407 static void dw_mci_dma_cleanup(struct dw_mci *host)
408 {
409         struct mmc_data *data = host->data;
410 
411         if (data)
412                 if (!data->host_cookie)
413                         dma_unmap_sg(host->dev,
414                                      data->sg,
415                                      data->sg_len,
416                                      dw_mci_get_dma_dir(data));
417 }
418 
419 static void dw_mci_idmac_reset(struct dw_mci *host)
420 {
421         u32 bmod = mci_readl(host, BMOD);
422         /* Software reset of DMA */
423         bmod |= SDMMC_IDMAC_SWRESET;
424         mci_writel(host, BMOD, bmod);
425 }
426 
427 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
428 {
429         u32 temp;
430 
431         /* Disable and reset the IDMAC interface */
432         temp = mci_readl(host, CTRL);
433         temp &= ~SDMMC_CTRL_USE_IDMAC;
434         temp |= SDMMC_CTRL_DMA_RESET;
435         mci_writel(host, CTRL, temp);
436 
437         /* Stop the IDMAC running */
438         temp = mci_readl(host, BMOD);
439         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
440         temp |= SDMMC_IDMAC_SWRESET;
441         mci_writel(host, BMOD, temp);
442 }
443 
444 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
445 {
446         struct mmc_data *data = host->data;
447 
448         dev_vdbg(host->dev, "DMA complete\n");
449 
450         host->dma_ops->cleanup(host);
451 
452         /*
453          * If the card was removed, data will be NULL. No point in trying to
454          * send the stop command or waiting for NBUSY in this case.
455          */
456         if (data) {
457                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
458                 tasklet_schedule(&host->tasklet);
459         }
460 }
461 
462 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
463                                     unsigned int sg_len)
464 {
465         int i;
466         if (host->dma_64bit_address == 1) {
467                 struct idmac_desc_64addr *desc = host->sg_cpu;
468 
469                 for (i = 0; i < sg_len; i++, desc++) {
470                         unsigned int length = sg_dma_len(&data->sg[i]);
471                         u64 mem_addr = sg_dma_address(&data->sg[i]);
472 
473                         /*
474                          * Set the OWN bit and disable interrupts for this
475                          * descriptor
476                          */
477                         desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
478                                                 IDMAC_DES0_CH;
479                         /* Buffer length */
480                         IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, length);
481 
482                         /* Physical address to DMA to/from */
483                         desc->des4 = mem_addr & 0xffffffff;
484                         desc->des5 = mem_addr >> 32;
485                 }
486 
487                 /* Set first descriptor */
488                 desc = host->sg_cpu;
489                 desc->des0 |= IDMAC_DES0_FD;
490 
491                 /* Set last descriptor */
492                 desc = host->sg_cpu + (i - 1) *
493                                 sizeof(struct idmac_desc_64addr);
494                 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
495                 desc->des0 |= IDMAC_DES0_LD;
496 
497         } else {
498                 struct idmac_desc *desc = host->sg_cpu;
499 
500                 for (i = 0; i < sg_len; i++, desc++) {
501                         unsigned int length = sg_dma_len(&data->sg[i]);
502                         u32 mem_addr = sg_dma_address(&data->sg[i]);
503 
504                         /*
505                          * Set the OWN bit and disable interrupts for this
506                          * descriptor
507                          */
508                         desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
509                                         IDMAC_DES0_DIC | IDMAC_DES0_CH);
510                         /* Buffer length */
511                         IDMAC_SET_BUFFER1_SIZE(desc, length);
512 
513                         /* Physical address to DMA to/from */
514                         desc->des2 = cpu_to_le32(mem_addr);
515                 }
516 
517                 /* Set first descriptor */
518                 desc = host->sg_cpu;
519                 desc->des0 |= cpu_to_le32(IDMAC_DES0_FD);
520 
521                 /* Set last descriptor */
522                 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
523                 desc->des0 &= cpu_to_le32(~(IDMAC_DES0_CH | IDMAC_DES0_DIC));
524                 desc->des0 |= cpu_to_le32(IDMAC_DES0_LD);
525         }
526 
527         wmb();
528 }
529 
530 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
531 {
532         u32 temp;
533 
534         dw_mci_translate_sglist(host, host->data, sg_len);
535 
536         /* Make sure to reset DMA in case we did PIO before this */
537         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
538         dw_mci_idmac_reset(host);
539 
540         /* Select IDMAC interface */
541         temp = mci_readl(host, CTRL);
542         temp |= SDMMC_CTRL_USE_IDMAC;
543         mci_writel(host, CTRL, temp);
544 
545         wmb();
546 
547         /* Enable the IDMAC */
548         temp = mci_readl(host, BMOD);
549         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
550         mci_writel(host, BMOD, temp);
551 
552         /* Start it running */
553         mci_writel(host, PLDMND, 1);
554 }
555 
556 static int dw_mci_idmac_init(struct dw_mci *host)
557 {
558         int i;
559 
560         if (host->dma_64bit_address == 1) {
561                 struct idmac_desc_64addr *p;
562                 /* Number of descriptors in the ring buffer */
563                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
564 
565                 /* Forward link the descriptor list */
566                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
567                                                                 i++, p++) {
568                         p->des6 = (host->sg_dma +
569                                         (sizeof(struct idmac_desc_64addr) *
570                                                         (i + 1))) & 0xffffffff;
571 
572                         p->des7 = (u64)(host->sg_dma +
573                                         (sizeof(struct idmac_desc_64addr) *
574                                                         (i + 1))) >> 32;
575                         /* Initialize reserved and buffer size fields to "" */
576                         p->des1 = 0;
577                         p->des2 = 0;
578                         p->des3 = 0;
579                 }
580 
581                 /* Set the last descriptor as the end-of-ring descriptor */
582                 p->des6 = host->sg_dma & 0xffffffff;
583                 p->des7 = (u64)host->sg_dma >> 32;
584                 p->des0 = IDMAC_DES0_ER;
585 
586         } else {
587                 struct idmac_desc *p;
588                 /* Number of descriptors in the ring buffer */
589                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
590 
591                 /* Forward link the descriptor list */
592                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++) {
593                         p->des3 = cpu_to_le32(host->sg_dma +
594                                         (sizeof(struct idmac_desc) * (i + 1)));
595                         p->des1 = 0;
596                 }
597 
598                 /* Set the last descriptor as the end-of-ring descriptor */
599                 p->des3 = cpu_to_le32(host->sg_dma);
600                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
601         }
602 
603         dw_mci_idmac_reset(host);
604 
605         if (host->dma_64bit_address == 1) {
606                 /* Mask out interrupts - get Tx & Rx complete only */
607                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
608                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
609                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
610 
611                 /* Set the descriptor base address */
612                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
613                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
614 
615         } else {
616                 /* Mask out interrupts - get Tx & Rx complete only */
617                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
618                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
619                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
620 
621                 /* Set the descriptor base address */
622                 mci_writel(host, DBADDR, host->sg_dma);
623         }
624 
625         return 0;
626 }
627 
628 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
629         .init = dw_mci_idmac_init,
630         .start = dw_mci_idmac_start_dma,
631         .stop = dw_mci_idmac_stop_dma,
632         .complete = dw_mci_idmac_complete_dma,
633         .cleanup = dw_mci_dma_cleanup,
634 };
635 #endif /* CONFIG_MMC_DW_IDMAC */
636 
637 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
638                                    struct mmc_data *data,
639                                    bool next)
640 {
641         struct scatterlist *sg;
642         unsigned int i, sg_len;
643 
644         if (!next && data->host_cookie)
645                 return data->host_cookie;
646 
647         /*
648          * We don't do DMA on "complex" transfers, i.e. with
649          * non-word-aligned buffers or lengths. Also, we don't bother
650          * with all the DMA setup overhead for short transfers.
651          */
652         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
653                 return -EINVAL;
654 
655         if (data->blksz & 3)
656                 return -EINVAL;
657 
658         for_each_sg(data->sg, sg, data->sg_len, i) {
659                 if (sg->offset & 3 || sg->length & 3)
660                         return -EINVAL;
661         }
662 
663         sg_len = dma_map_sg(host->dev,
664                             data->sg,
665                             data->sg_len,
666                             dw_mci_get_dma_dir(data));
667         if (sg_len == 0)
668                 return -EINVAL;
669 
670         if (next)
671                 data->host_cookie = sg_len;
672 
673         return sg_len;
674 }
675 
676 static void dw_mci_pre_req(struct mmc_host *mmc,
677                            struct mmc_request *mrq,
678                            bool is_first_req)
679 {
680         struct dw_mci_slot *slot = mmc_priv(mmc);
681         struct mmc_data *data = mrq->data;
682 
683         if (!slot->host->use_dma || !data)
684                 return;
685 
686         if (data->host_cookie) {
687                 data->host_cookie = 0;
688                 return;
689         }
690 
691         if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
692                 data->host_cookie = 0;
693 }
694 
695 static void dw_mci_post_req(struct mmc_host *mmc,
696                             struct mmc_request *mrq,
697                             int err)
698 {
699         struct dw_mci_slot *slot = mmc_priv(mmc);
700         struct mmc_data *data = mrq->data;
701 
702         if (!slot->host->use_dma || !data)
703                 return;
704 
705         if (data->host_cookie)
706                 dma_unmap_sg(slot->host->dev,
707                              data->sg,
708                              data->sg_len,
709                              dw_mci_get_dma_dir(data));
710         data->host_cookie = 0;
711 }
712 
713 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
714 {
715 #ifdef CONFIG_MMC_DW_IDMAC
716         unsigned int blksz = data->blksz;
717         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
718         u32 fifo_width = 1 << host->data_shift;
719         u32 blksz_depth = blksz / fifo_width, fifoth_val;
720         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
721         int idx = (sizeof(mszs) / sizeof(mszs[0])) - 1;
722 
723         tx_wmark = (host->fifo_depth) / 2;
724         tx_wmark_invers = host->fifo_depth - tx_wmark;
725 
726         /*
727          * MSIZE is '1',
728          * if blksz is not a multiple of the FIFO width
729          */
730         if (blksz % fifo_width) {
731                 msize = 0;
732                 rx_wmark = 1;
733                 goto done;
734         }
735 
736         do {
737                 if (!((blksz_depth % mszs[idx]) ||
738                      (tx_wmark_invers % mszs[idx]))) {
739                         msize = idx;
740                         rx_wmark = mszs[idx] - 1;
741                         break;
742                 }
743         } while (--idx > 0);
744         /*
745          * If idx is '', it won't be tried
746          * Thus, initial values are uesed
747          */
748 done:
749         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
750         mci_writel(host, FIFOTH, fifoth_val);
751 #endif
752 }
753 
754 static void dw_mci_ctrl_rd_thld(struct dw_mci *host, struct mmc_data *data)
755 {
756         unsigned int blksz = data->blksz;
757         u32 blksz_depth, fifo_depth;
758         u16 thld_size;
759 
760         WARN_ON(!(data->flags & MMC_DATA_READ));
761 
762         /*
763          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
764          * in the FIFO region, so we really shouldn't access it).
765          */
766         if (host->verid < DW_MMC_240A)
767                 return;
768 
769         if (host->timing != MMC_TIMING_MMC_HS200 &&
770             host->timing != MMC_TIMING_MMC_HS400 &&
771             host->timing != MMC_TIMING_UHS_SDR104)
772                 goto disable;
773 
774         blksz_depth = blksz / (1 << host->data_shift);
775         fifo_depth = host->fifo_depth;
776 
777         if (blksz_depth > fifo_depth)
778                 goto disable;
779 
780         /*
781          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
782          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
783          * Currently just choose blksz.
784          */
785         thld_size = blksz;
786         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(thld_size, 1));
787         return;
788 
789 disable:
790         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(0, 0));
791 }
792 
793 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
794 {
795         unsigned long irqflags;
796         int sg_len;
797         u32 temp;
798 
799         host->using_dma = 0;
800 
801         /* If we don't have a channel, we can't do DMA */
802         if (!host->use_dma)
803                 return -ENODEV;
804 
805         sg_len = dw_mci_pre_dma_transfer(host, data, 0);
806         if (sg_len < 0) {
807                 host->dma_ops->stop(host);
808                 return sg_len;
809         }
810 
811         host->using_dma = 1;
812 
813         dev_vdbg(host->dev,
814                  "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
815                  (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
816                  sg_len);
817 
818         /*
819          * Decide the MSIZE and RX/TX Watermark.
820          * If current block size is same with previous size,
821          * no need to update fifoth.
822          */
823         if (host->prev_blksz != data->blksz)
824                 dw_mci_adjust_fifoth(host, data);
825 
826         /* Enable the DMA interface */
827         temp = mci_readl(host, CTRL);
828         temp |= SDMMC_CTRL_DMA_ENABLE;
829         mci_writel(host, CTRL, temp);
830 
831         /* Disable RX/TX IRQs, let DMA handle it */
832         spin_lock_irqsave(&host->irq_lock, irqflags);
833         temp = mci_readl(host, INTMASK);
834         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
835         mci_writel(host, INTMASK, temp);
836         spin_unlock_irqrestore(&host->irq_lock, irqflags);
837 
838         host->dma_ops->start(host, sg_len);
839 
840         return 0;
841 }
842 
843 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
844 {
845         unsigned long irqflags;
846         u32 temp;
847 
848         data->error = -EINPROGRESS;
849 
850         WARN_ON(host->data);
851         host->sg = NULL;
852         host->data = data;
853 
854         if (data->flags & MMC_DATA_READ) {
855                 host->dir_status = DW_MCI_RECV_STATUS;
856                 dw_mci_ctrl_rd_thld(host, data);
857         } else {
858                 host->dir_status = DW_MCI_SEND_STATUS;
859         }
860 
861         if (dw_mci_submit_data_dma(host, data)) {
862                 int flags = SG_MITER_ATOMIC;
863                 if (host->data->flags & MMC_DATA_READ)
864                         flags |= SG_MITER_TO_SG;
865                 else
866                         flags |= SG_MITER_FROM_SG;
867 
868                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
869                 host->sg = data->sg;
870                 host->part_buf_start = 0;
871                 host->part_buf_count = 0;
872 
873                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
874 
875                 spin_lock_irqsave(&host->irq_lock, irqflags);
876                 temp = mci_readl(host, INTMASK);
877                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
878                 mci_writel(host, INTMASK, temp);
879                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
880 
881                 temp = mci_readl(host, CTRL);
882                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
883                 mci_writel(host, CTRL, temp);
884 
885                 /*
886                  * Use the initial fifoth_val for PIO mode.
887                  * If next issued data may be transfered by DMA mode,
888                  * prev_blksz should be invalidated.
889                  */
890                 mci_writel(host, FIFOTH, host->fifoth_val);
891                 host->prev_blksz = 0;
892         } else {
893                 /*
894                  * Keep the current block size.
895                  * It will be used to decide whether to update
896                  * fifoth register next time.
897                  */
898                 host->prev_blksz = data->blksz;
899         }
900 }
901 
902 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
903 {
904         struct dw_mci *host = slot->host;
905         unsigned long timeout = jiffies + msecs_to_jiffies(500);
906         unsigned int cmd_status = 0;
907 
908         mci_writel(host, CMDARG, arg);
909         wmb();
910         dw_mci_wait_while_busy(host, cmd);
911         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
912 
913         while (time_before(jiffies, timeout)) {
914                 cmd_status = mci_readl(host, CMD);
915                 if (!(cmd_status & SDMMC_CMD_START))
916                         return;
917         }
918         dev_err(&slot->mmc->class_dev,
919                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
920                 cmd, arg, cmd_status);
921 }
922 
923 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
924 {
925         struct dw_mci *host = slot->host;
926         unsigned int clock = slot->clock;
927         u32 div;
928         u32 clk_en_a;
929         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
930 
931         /* We must continue to set bit 28 in CMD until the change is complete */
932         if (host->state == STATE_WAITING_CMD11_DONE)
933                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
934 
935         if (!clock) {
936                 mci_writel(host, CLKENA, 0);
937                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
938         } else if (clock != host->current_speed || force_clkinit) {
939                 div = host->bus_hz / clock;
940                 if (host->bus_hz % clock && host->bus_hz > clock)
941                         /*
942                          * move the + 1 after the divide to prevent
943                          * over-clocking the card.
944                          */
945                         div += 1;
946 
947                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
948 
949                 if ((clock << div) != slot->__clk_old || force_clkinit)
950                         dev_info(&slot->mmc->class_dev,
951                                  "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
952                                  slot->id, host->bus_hz, clock,
953                                  div ? ((host->bus_hz / div) >> 1) :
954                                  host->bus_hz, div);
955 
956                 /* disable clock */
957                 mci_writel(host, CLKENA, 0);
958                 mci_writel(host, CLKSRC, 0);
959 
960                 /* inform CIU */
961                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
962 
963                 /* set clock to desired speed */
964                 mci_writel(host, CLKDIV, div);
965 
966                 /* inform CIU */
967                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
968 
969                 /* enable clock; only low power if no SDIO */
970                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
971                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
972                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
973                 mci_writel(host, CLKENA, clk_en_a);
974 
975                 /* inform CIU */
976                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
977 
978                 /* keep the clock with reflecting clock dividor */
979                 slot->__clk_old = clock << div;
980         }
981 
982         host->current_speed = clock;
983 
984         /* Set the current slot bus width */
985         mci_writel(host, CTYPE, (slot->ctype << slot->id));
986 }
987 
988 static void __dw_mci_start_request(struct dw_mci *host,
989                                    struct dw_mci_slot *slot,
990                                    struct mmc_command *cmd)
991 {
992         struct mmc_request *mrq;
993         struct mmc_data *data;
994         u32 cmdflags;
995 
996         mrq = slot->mrq;
997 
998         host->cur_slot = slot;
999         host->mrq = mrq;
1000 
1001         host->pending_events = 0;
1002         host->completed_events = 0;
1003         host->cmd_status = 0;
1004         host->data_status = 0;
1005         host->dir_status = 0;
1006 
1007         data = cmd->data;
1008         if (data) {
1009                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1010                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1011                 mci_writel(host, BLKSIZ, data->blksz);
1012         }
1013 
1014         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1015 
1016         /* this is the first command, send the initialization clock */
1017         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1018                 cmdflags |= SDMMC_CMD_INIT;
1019 
1020         if (data) {
1021                 dw_mci_submit_data(host, data);
1022                 wmb();
1023         }
1024 
1025         dw_mci_start_command(host, cmd, cmdflags);
1026 
1027         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1028                 unsigned long irqflags;
1029 
1030                 /*
1031                  * Databook says to fail after 2ms w/ no response, but evidence
1032                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1033                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1034                  * is just about to roll over.
1035                  *
1036                  * We do this whole thing under spinlock and only if the
1037                  * command hasn't already completed (indicating the the irq
1038                  * already ran so we don't want the timeout).
1039                  */
1040                 spin_lock_irqsave(&host->irq_lock, irqflags);
1041                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1042                         mod_timer(&host->cmd11_timer,
1043                                 jiffies + msecs_to_jiffies(500) + 1);
1044                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1045         }
1046 
1047         if (mrq->stop)
1048                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
1049         else
1050                 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1051 }
1052 
1053 static void dw_mci_start_request(struct dw_mci *host,
1054                                  struct dw_mci_slot *slot)
1055 {
1056         struct mmc_request *mrq = slot->mrq;
1057         struct mmc_command *cmd;
1058 
1059         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1060         __dw_mci_start_request(host, slot, cmd);
1061 }
1062 
1063 /* must be called with host->lock held */
1064 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1065                                  struct mmc_request *mrq)
1066 {
1067         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1068                  host->state);
1069 
1070         slot->mrq = mrq;
1071 
1072         if (host->state == STATE_WAITING_CMD11_DONE) {
1073                 dev_warn(&slot->mmc->class_dev,
1074                          "Voltage change didn't complete\n");
1075                 /*
1076                  * this case isn't expected to happen, so we can
1077                  * either crash here or just try to continue on
1078                  * in the closest possible state
1079                  */
1080                 host->state = STATE_IDLE;
1081         }
1082 
1083         if (host->state == STATE_IDLE) {
1084                 host->state = STATE_SENDING_CMD;
1085                 dw_mci_start_request(host, slot);
1086         } else {
1087                 list_add_tail(&slot->queue_node, &host->queue);
1088         }
1089 }
1090 
1091 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1092 {
1093         struct dw_mci_slot *slot = mmc_priv(mmc);
1094         struct dw_mci *host = slot->host;
1095 
1096         WARN_ON(slot->mrq);
1097 
1098         /*
1099          * The check for card presence and queueing of the request must be
1100          * atomic, otherwise the card could be removed in between and the
1101          * request wouldn't fail until another card was inserted.
1102          */
1103         spin_lock_bh(&host->lock);
1104 
1105         if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
1106                 spin_unlock_bh(&host->lock);
1107                 mrq->cmd->error = -ENOMEDIUM;
1108                 mmc_request_done(mmc, mrq);
1109                 return;
1110         }
1111 
1112         dw_mci_queue_request(host, slot, mrq);
1113 
1114         spin_unlock_bh(&host->lock);
1115 }
1116 
1117 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1118 {
1119         struct dw_mci_slot *slot = mmc_priv(mmc);
1120         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1121         u32 regs;
1122         int ret;
1123 
1124         switch (ios->bus_width) {
1125         case MMC_BUS_WIDTH_4:
1126                 slot->ctype = SDMMC_CTYPE_4BIT;
1127                 break;
1128         case MMC_BUS_WIDTH_8:
1129                 slot->ctype = SDMMC_CTYPE_8BIT;
1130                 break;
1131         default:
1132                 /* set default 1 bit mode */
1133                 slot->ctype = SDMMC_CTYPE_1BIT;
1134         }
1135 
1136         regs = mci_readl(slot->host, UHS_REG);
1137 
1138         /* DDR mode set */
1139         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1140             ios->timing == MMC_TIMING_MMC_HS400)
1141                 regs |= ((0x1 << slot->id) << 16);
1142         else
1143                 regs &= ~((0x1 << slot->id) << 16);
1144 
1145         mci_writel(slot->host, UHS_REG, regs);
1146         slot->host->timing = ios->timing;
1147 
1148         /*
1149          * Use mirror of ios->clock to prevent race with mmc
1150          * core ios update when finding the minimum.
1151          */
1152         slot->clock = ios->clock;
1153 
1154         if (drv_data && drv_data->set_ios)
1155                 drv_data->set_ios(slot->host, ios);
1156 
1157         switch (ios->power_mode) {
1158         case MMC_POWER_UP:
1159                 if (!IS_ERR(mmc->supply.vmmc)) {
1160                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1161                                         ios->vdd);
1162                         if (ret) {
1163                                 dev_err(slot->host->dev,
1164                                         "failed to enable vmmc regulator\n");
1165                                 /*return, if failed turn on vmmc*/
1166                                 return;
1167                         }
1168                 }
1169                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1170                 regs = mci_readl(slot->host, PWREN);
1171                 regs |= (1 << slot->id);
1172                 mci_writel(slot->host, PWREN, regs);
1173                 break;
1174         case MMC_POWER_ON:
1175                 if (!slot->host->vqmmc_enabled) {
1176                         if (!IS_ERR(mmc->supply.vqmmc)) {
1177                                 ret = regulator_enable(mmc->supply.vqmmc);
1178                                 if (ret < 0)
1179                                         dev_err(slot->host->dev,
1180                                                 "failed to enable vqmmc\n");
1181                                 else
1182                                         slot->host->vqmmc_enabled = true;
1183 
1184                         } else {
1185                                 /* Keep track so we don't reset again */
1186                                 slot->host->vqmmc_enabled = true;
1187                         }
1188 
1189                         /* Reset our state machine after powering on */
1190                         dw_mci_ctrl_reset(slot->host,
1191                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1192                 }
1193 
1194                 /* Adjust clock / bus width after power is up */
1195                 dw_mci_setup_bus(slot, false);
1196 
1197                 break;
1198         case MMC_POWER_OFF:
1199                 /* Turn clock off before power goes down */
1200                 dw_mci_setup_bus(slot, false);
1201 
1202                 if (!IS_ERR(mmc->supply.vmmc))
1203                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1204 
1205                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1206                         regulator_disable(mmc->supply.vqmmc);
1207                 slot->host->vqmmc_enabled = false;
1208 
1209                 regs = mci_readl(slot->host, PWREN);
1210                 regs &= ~(1 << slot->id);
1211                 mci_writel(slot->host, PWREN, regs);
1212                 break;
1213         default:
1214                 break;
1215         }
1216 
1217         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1218                 slot->host->state = STATE_IDLE;
1219 }
1220 
1221 static int dw_mci_card_busy(struct mmc_host *mmc)
1222 {
1223         struct dw_mci_slot *slot = mmc_priv(mmc);
1224         u32 status;
1225 
1226         /*
1227          * Check the busy bit which is low when DAT[3:0]
1228          * (the data lines) are 0000
1229          */
1230         status = mci_readl(slot->host, STATUS);
1231 
1232         return !!(status & SDMMC_STATUS_BUSY);
1233 }
1234 
1235 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1236 {
1237         struct dw_mci_slot *slot = mmc_priv(mmc);
1238         struct dw_mci *host = slot->host;
1239         const struct dw_mci_drv_data *drv_data = host->drv_data;
1240         u32 uhs;
1241         u32 v18 = SDMMC_UHS_18V << slot->id;
1242         int min_uv, max_uv;
1243         int ret;
1244 
1245         if (drv_data && drv_data->switch_voltage)
1246                 return drv_data->switch_voltage(mmc, ios);
1247 
1248         /*
1249          * Program the voltage.  Note that some instances of dw_mmc may use
1250          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1251          * does no harm but you need to set the regulator directly.  Try both.
1252          */
1253         uhs = mci_readl(host, UHS_REG);
1254         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1255                 min_uv = 2700000;
1256                 max_uv = 3600000;
1257                 uhs &= ~v18;
1258         } else {
1259                 min_uv = 1700000;
1260                 max_uv = 1950000;
1261                 uhs |= v18;
1262         }
1263         if (!IS_ERR(mmc->supply.vqmmc)) {
1264                 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
1265 
1266                 if (ret) {
1267                         dev_dbg(&mmc->class_dev,
1268                                          "Regulator set error %d: %d - %d\n",
1269                                          ret, min_uv, max_uv);
1270                         return ret;
1271                 }
1272         }
1273         mci_writel(host, UHS_REG, uhs);
1274 
1275         return 0;
1276 }
1277 
1278 static int dw_mci_get_ro(struct mmc_host *mmc)
1279 {
1280         int read_only;
1281         struct dw_mci_slot *slot = mmc_priv(mmc);
1282         int gpio_ro = mmc_gpio_get_ro(mmc);
1283 
1284         /* Use platform get_ro function, else try on board write protect */
1285         if (!IS_ERR_VALUE(gpio_ro))
1286                 read_only = gpio_ro;
1287         else
1288                 read_only =
1289                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1290 
1291         dev_dbg(&mmc->class_dev, "card is %s\n",
1292                 read_only ? "read-only" : "read-write");
1293 
1294         return read_only;
1295 }
1296 
1297 static int dw_mci_get_cd(struct mmc_host *mmc)
1298 {
1299         int present;
1300         struct dw_mci_slot *slot = mmc_priv(mmc);
1301         struct dw_mci_board *brd = slot->host->pdata;
1302         struct dw_mci *host = slot->host;
1303         int gpio_cd = mmc_gpio_get_cd(mmc);
1304 
1305         /* Use platform get_cd function, else try onboard card detect */
1306         if ((brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION) ||
1307             (mmc->caps & MMC_CAP_NONREMOVABLE))
1308                 present = 1;
1309         else if (!IS_ERR_VALUE(gpio_cd))
1310                 present = gpio_cd;
1311         else
1312                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1313                         == 0 ? 1 : 0;
1314 
1315         spin_lock_bh(&host->lock);
1316         if (present) {
1317                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1318                 dev_dbg(&mmc->class_dev, "card is present\n");
1319         } else {
1320                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1321                 dev_dbg(&mmc->class_dev, "card is not present\n");
1322         }
1323         spin_unlock_bh(&host->lock);
1324 
1325         return present;
1326 }
1327 
1328 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1329 {
1330         struct dw_mci_slot *slot = mmc_priv(mmc);
1331         struct dw_mci *host = slot->host;
1332 
1333         /*
1334          * Low power mode will stop the card clock when idle.  According to the
1335          * description of the CLKENA register we should disable low power mode
1336          * for SDIO cards if we need SDIO interrupts to work.
1337          */
1338         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1339                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1340                 u32 clk_en_a_old;
1341                 u32 clk_en_a;
1342 
1343                 clk_en_a_old = mci_readl(host, CLKENA);
1344 
1345                 if (card->type == MMC_TYPE_SDIO ||
1346                     card->type == MMC_TYPE_SD_COMBO) {
1347                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1348                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1349                 } else {
1350                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1351                         clk_en_a = clk_en_a_old | clken_low_pwr;
1352                 }
1353 
1354                 if (clk_en_a != clk_en_a_old) {
1355                         mci_writel(host, CLKENA, clk_en_a);
1356                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1357                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1358                 }
1359         }
1360 }
1361 
1362 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1363 {
1364         struct dw_mci_slot *slot = mmc_priv(mmc);
1365         struct dw_mci *host = slot->host;
1366         unsigned long irqflags;
1367         u32 int_mask;
1368 
1369         spin_lock_irqsave(&host->irq_lock, irqflags);
1370 
1371         /* Enable/disable Slot Specific SDIO interrupt */
1372         int_mask = mci_readl(host, INTMASK);
1373         if (enb)
1374                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1375         else
1376                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1377         mci_writel(host, INTMASK, int_mask);
1378 
1379         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1380 }
1381 
1382 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1383 {
1384         struct dw_mci_slot *slot = mmc_priv(mmc);
1385         struct dw_mci *host = slot->host;
1386         const struct dw_mci_drv_data *drv_data = host->drv_data;
1387         int err = -ENOSYS;
1388 
1389         if (drv_data && drv_data->execute_tuning)
1390                 err = drv_data->execute_tuning(slot);
1391         return err;
1392 }
1393 
1394 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1395 {
1396         struct dw_mci_slot *slot = mmc_priv(mmc);
1397         struct dw_mci *host = slot->host;
1398         const struct dw_mci_drv_data *drv_data = host->drv_data;
1399 
1400         if (drv_data && drv_data->prepare_hs400_tuning)
1401                 return drv_data->prepare_hs400_tuning(host, ios);
1402 
1403         return 0;
1404 }
1405 
1406 static const struct mmc_host_ops dw_mci_ops = {
1407         .request                = dw_mci_request,
1408         .pre_req                = dw_mci_pre_req,
1409         .post_req               = dw_mci_post_req,
1410         .set_ios                = dw_mci_set_ios,
1411         .get_ro                 = dw_mci_get_ro,
1412         .get_cd                 = dw_mci_get_cd,
1413         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1414         .execute_tuning         = dw_mci_execute_tuning,
1415         .card_busy              = dw_mci_card_busy,
1416         .start_signal_voltage_switch = dw_mci_switch_voltage,
1417         .init_card              = dw_mci_init_card,
1418         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1419 };
1420 
1421 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1422         __releases(&host->lock)
1423         __acquires(&host->lock)
1424 {
1425         struct dw_mci_slot *slot;
1426         struct mmc_host *prev_mmc = host->cur_slot->mmc;
1427 
1428         WARN_ON(host->cmd || host->data);
1429 
1430         host->cur_slot->mrq = NULL;
1431         host->mrq = NULL;
1432         if (!list_empty(&host->queue)) {
1433                 slot = list_entry(host->queue.next,
1434                                   struct dw_mci_slot, queue_node);
1435                 list_del(&slot->queue_node);
1436                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1437                          mmc_hostname(slot->mmc));
1438                 host->state = STATE_SENDING_CMD;
1439                 dw_mci_start_request(host, slot);
1440         } else {
1441                 dev_vdbg(host->dev, "list empty\n");
1442 
1443                 if (host->state == STATE_SENDING_CMD11)
1444                         host->state = STATE_WAITING_CMD11_DONE;
1445                 else
1446                         host->state = STATE_IDLE;
1447         }
1448 
1449         spin_unlock(&host->lock);
1450         mmc_request_done(prev_mmc, mrq);
1451         spin_lock(&host->lock);
1452 }
1453 
1454 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1455 {
1456         u32 status = host->cmd_status;
1457 
1458         host->cmd_status = 0;
1459 
1460         /* Read the response from the card (up to 16 bytes) */
1461         if (cmd->flags & MMC_RSP_PRESENT) {
1462                 if (cmd->flags & MMC_RSP_136) {
1463                         cmd->resp[3] = mci_readl(host, RESP0);
1464                         cmd->resp[2] = mci_readl(host, RESP1);
1465                         cmd->resp[1] = mci_readl(host, RESP2);
1466                         cmd->resp[0] = mci_readl(host, RESP3);
1467                 } else {
1468                         cmd->resp[0] = mci_readl(host, RESP0);
1469                         cmd->resp[1] = 0;
1470                         cmd->resp[2] = 0;
1471                         cmd->resp[3] = 0;
1472                 }
1473         }
1474 
1475         if (status & SDMMC_INT_RTO)
1476                 cmd->error = -ETIMEDOUT;
1477         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1478                 cmd->error = -EILSEQ;
1479         else if (status & SDMMC_INT_RESP_ERR)
1480                 cmd->error = -EIO;
1481         else
1482                 cmd->error = 0;
1483 
1484         if (cmd->error) {
1485                 /* newer ip versions need a delay between retries */
1486                 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1487                         mdelay(20);
1488         }
1489 
1490         return cmd->error;
1491 }
1492 
1493 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1494 {
1495         u32 status = host->data_status;
1496 
1497         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1498                 if (status & SDMMC_INT_DRTO) {
1499                         data->error = -ETIMEDOUT;
1500                 } else if (status & SDMMC_INT_DCRC) {
1501                         data->error = -EILSEQ;
1502                 } else if (status & SDMMC_INT_EBE) {
1503                         if (host->dir_status ==
1504                                 DW_MCI_SEND_STATUS) {
1505                                 /*
1506                                  * No data CRC status was returned.
1507                                  * The number of bytes transferred
1508                                  * will be exaggerated in PIO mode.
1509                                  */
1510                                 data->bytes_xfered = 0;
1511                                 data->error = -ETIMEDOUT;
1512                         } else if (host->dir_status ==
1513                                         DW_MCI_RECV_STATUS) {
1514                                 data->error = -EIO;
1515                         }
1516                 } else {
1517                         /* SDMMC_INT_SBE is included */
1518                         data->error = -EIO;
1519                 }
1520 
1521                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1522 
1523                 /*
1524                  * After an error, there may be data lingering
1525                  * in the FIFO
1526                  */
1527                 dw_mci_reset(host);
1528         } else {
1529                 data->bytes_xfered = data->blocks * data->blksz;
1530                 data->error = 0;
1531         }
1532 
1533         return data->error;
1534 }
1535 
1536 static void dw_mci_tasklet_func(unsigned long priv)
1537 {
1538         struct dw_mci *host = (struct dw_mci *)priv;
1539         struct mmc_data *data;
1540         struct mmc_command *cmd;
1541         struct mmc_request *mrq;
1542         enum dw_mci_state state;
1543         enum dw_mci_state prev_state;
1544         unsigned int err;
1545 
1546         spin_lock(&host->lock);
1547 
1548         state = host->state;
1549         data = host->data;
1550         mrq = host->mrq;
1551 
1552         do {
1553                 prev_state = state;
1554 
1555                 switch (state) {
1556                 case STATE_IDLE:
1557                 case STATE_WAITING_CMD11_DONE:
1558                         break;
1559 
1560                 case STATE_SENDING_CMD11:
1561                 case STATE_SENDING_CMD:
1562                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1563                                                 &host->pending_events))
1564                                 break;
1565 
1566                         cmd = host->cmd;
1567                         host->cmd = NULL;
1568                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1569                         err = dw_mci_command_complete(host, cmd);
1570                         if (cmd == mrq->sbc && !err) {
1571                                 prev_state = state = STATE_SENDING_CMD;
1572                                 __dw_mci_start_request(host, host->cur_slot,
1573                                                        mrq->cmd);
1574                                 goto unlock;
1575                         }
1576 
1577                         if (cmd->data && err) {
1578                                 dw_mci_stop_dma(host);
1579                                 send_stop_abort(host, data);
1580                                 state = STATE_SENDING_STOP;
1581                                 break;
1582                         }
1583 
1584                         if (!cmd->data || err) {
1585                                 dw_mci_request_end(host, mrq);
1586                                 goto unlock;
1587                         }
1588 
1589                         prev_state = state = STATE_SENDING_DATA;
1590                         /* fall through */
1591 
1592                 case STATE_SENDING_DATA:
1593                         /*
1594                          * We could get a data error and never a transfer
1595                          * complete so we'd better check for it here.
1596                          *
1597                          * Note that we don't really care if we also got a
1598                          * transfer complete; stopping the DMA and sending an
1599                          * abort won't hurt.
1600                          */
1601                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1602                                                &host->pending_events)) {
1603                                 dw_mci_stop_dma(host);
1604                                 if (data->stop ||
1605                                     !(host->data_status & (SDMMC_INT_DRTO |
1606                                                            SDMMC_INT_EBE)))
1607                                         send_stop_abort(host, data);
1608                                 state = STATE_DATA_ERROR;
1609                                 break;
1610                         }
1611 
1612                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1613                                                 &host->pending_events))
1614                                 break;
1615 
1616                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1617 
1618                         /*
1619                          * Handle an EVENT_DATA_ERROR that might have shown up
1620                          * before the transfer completed.  This might not have
1621                          * been caught by the check above because the interrupt
1622                          * could have gone off between the previous check and
1623                          * the check for transfer complete.
1624                          *
1625                          * Technically this ought not be needed assuming we
1626                          * get a DATA_COMPLETE eventually (we'll notice the
1627                          * error and end the request), but it shouldn't hurt.
1628                          *
1629                          * This has the advantage of sending the stop command.
1630                          */
1631                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1632                                                &host->pending_events)) {
1633                                 dw_mci_stop_dma(host);
1634                                 if (data->stop ||
1635                                     !(host->data_status & (SDMMC_INT_DRTO |
1636                                                            SDMMC_INT_EBE)))
1637                                         send_stop_abort(host, data);
1638                                 state = STATE_DATA_ERROR;
1639                                 break;
1640                         }
1641                         prev_state = state = STATE_DATA_BUSY;
1642 
1643                         /* fall through */
1644 
1645                 case STATE_DATA_BUSY:
1646                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1647                                                 &host->pending_events))
1648                                 break;
1649 
1650                         host->data = NULL;
1651                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1652                         err = dw_mci_data_complete(host, data);
1653 
1654                         if (!err) {
1655                                 if (!data->stop || mrq->sbc) {
1656                                         if (mrq->sbc && data->stop)
1657                                                 data->stop->error = 0;
1658                                         dw_mci_request_end(host, mrq);
1659                                         goto unlock;
1660                                 }
1661 
1662                                 /* stop command for open-ended transfer*/
1663                                 if (data->stop)
1664                                         send_stop_abort(host, data);
1665                         } else {
1666                                 /*
1667                                  * If we don't have a command complete now we'll
1668                                  * never get one since we just reset everything;
1669                                  * better end the request.
1670                                  *
1671                                  * If we do have a command complete we'll fall
1672                                  * through to the SENDING_STOP command and
1673                                  * everything will be peachy keen.
1674                                  */
1675                                 if (!test_bit(EVENT_CMD_COMPLETE,
1676                                               &host->pending_events)) {
1677                                         host->cmd = NULL;
1678                                         dw_mci_request_end(host, mrq);
1679                                         goto unlock;
1680                                 }
1681                         }
1682 
1683                         /*
1684                          * If err has non-zero,
1685                          * stop-abort command has been already issued.
1686                          */
1687                         prev_state = state = STATE_SENDING_STOP;
1688 
1689                         /* fall through */
1690 
1691                 case STATE_SENDING_STOP:
1692                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1693                                                 &host->pending_events))
1694                                 break;
1695 
1696                         /* CMD error in data command */
1697                         if (mrq->cmd->error && mrq->data)
1698                                 dw_mci_reset(host);
1699 
1700                         host->cmd = NULL;
1701                         host->data = NULL;
1702 
1703                         if (mrq->stop)
1704                                 dw_mci_command_complete(host, mrq->stop);
1705                         else
1706                                 host->cmd_status = 0;
1707 
1708                         dw_mci_request_end(host, mrq);
1709                         goto unlock;
1710 
1711                 case STATE_DATA_ERROR:
1712                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1713                                                 &host->pending_events))
1714                                 break;
1715 
1716                         state = STATE_DATA_BUSY;
1717                         break;
1718                 }
1719         } while (state != prev_state);
1720 
1721         host->state = state;
1722 unlock:
1723         spin_unlock(&host->lock);
1724 
1725 }
1726 
1727 /* push final bytes to part_buf, only use during push */
1728 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1729 {
1730         memcpy((void *)&host->part_buf, buf, cnt);
1731         host->part_buf_count = cnt;
1732 }
1733 
1734 /* append bytes to part_buf, only use during push */
1735 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1736 {
1737         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1738         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1739         host->part_buf_count += cnt;
1740         return cnt;
1741 }
1742 
1743 /* pull first bytes from part_buf, only use during pull */
1744 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1745 {
1746         cnt = min(cnt, (int)host->part_buf_count);
1747         if (cnt) {
1748                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1749                        cnt);
1750                 host->part_buf_count -= cnt;
1751                 host->part_buf_start += cnt;
1752         }
1753         return cnt;
1754 }
1755 
1756 /* pull final bytes from the part_buf, assuming it's just been filled */
1757 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1758 {
1759         memcpy(buf, &host->part_buf, cnt);
1760         host->part_buf_start = cnt;
1761         host->part_buf_count = (1 << host->data_shift) - cnt;
1762 }
1763 
1764 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1765 {
1766         struct mmc_data *data = host->data;
1767         int init_cnt = cnt;
1768 
1769         /* try and push anything in the part_buf */
1770         if (unlikely(host->part_buf_count)) {
1771                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1772                 buf += len;
1773                 cnt -= len;
1774                 if (host->part_buf_count == 2) {
1775                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
1776                         host->part_buf_count = 0;
1777                 }
1778         }
1779 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1780         if (unlikely((unsigned long)buf & 0x1)) {
1781                 while (cnt >= 2) {
1782                         u16 aligned_buf[64];
1783                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1784                         int items = len >> 1;
1785                         int i;
1786                         /* memcpy from input buffer into aligned buffer */
1787                         memcpy(aligned_buf, buf, len);
1788                         buf += len;
1789                         cnt -= len;
1790                         /* push data from aligned buffer into fifo */
1791                         for (i = 0; i < items; ++i)
1792                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
1793                 }
1794         } else
1795 #endif
1796         {
1797                 u16 *pdata = buf;
1798                 for (; cnt >= 2; cnt -= 2)
1799                         mci_fifo_writew(host->fifo_reg, *pdata++);
1800                 buf = pdata;
1801         }
1802         /* put anything remaining in the part_buf */
1803         if (cnt) {
1804                 dw_mci_set_part_bytes(host, buf, cnt);
1805                  /* Push data if we have reached the expected data length */
1806                 if ((data->bytes_xfered + init_cnt) ==
1807                     (data->blksz * data->blocks))
1808                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
1809         }
1810 }
1811 
1812 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1813 {
1814 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1815         if (unlikely((unsigned long)buf & 0x1)) {
1816                 while (cnt >= 2) {
1817                         /* pull data from fifo into aligned buffer */
1818                         u16 aligned_buf[64];
1819                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1820                         int items = len >> 1;
1821                         int i;
1822                         for (i = 0; i < items; ++i)
1823                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
1824                         /* memcpy from aligned buffer into output buffer */
1825                         memcpy(buf, aligned_buf, len);
1826                         buf += len;
1827                         cnt -= len;
1828                 }
1829         } else
1830 #endif
1831         {
1832                 u16 *pdata = buf;
1833                 for (; cnt >= 2; cnt -= 2)
1834                         *pdata++ = mci_fifo_readw(host->fifo_reg);
1835                 buf = pdata;
1836         }
1837         if (cnt) {
1838                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
1839                 dw_mci_pull_final_bytes(host, buf, cnt);
1840         }
1841 }
1842 
1843 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1844 {
1845         struct mmc_data *data = host->data;
1846         int init_cnt = cnt;
1847 
1848         /* try and push anything in the part_buf */
1849         if (unlikely(host->part_buf_count)) {
1850                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1851                 buf += len;
1852                 cnt -= len;
1853                 if (host->part_buf_count == 4) {
1854                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
1855                         host->part_buf_count = 0;
1856                 }
1857         }
1858 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1859         if (unlikely((unsigned long)buf & 0x3)) {
1860                 while (cnt >= 4) {
1861                         u32 aligned_buf[32];
1862                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1863                         int items = len >> 2;
1864                         int i;
1865                         /* memcpy from input buffer into aligned buffer */
1866                         memcpy(aligned_buf, buf, len);
1867                         buf += len;
1868                         cnt -= len;
1869                         /* push data from aligned buffer into fifo */
1870                         for (i = 0; i < items; ++i)
1871                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
1872                 }
1873         } else
1874 #endif
1875         {
1876                 u32 *pdata = buf;
1877                 for (; cnt >= 4; cnt -= 4)
1878                         mci_fifo_writel(host->fifo_reg, *pdata++);
1879                 buf = pdata;
1880         }
1881         /* put anything remaining in the part_buf */
1882         if (cnt) {
1883                 dw_mci_set_part_bytes(host, buf, cnt);
1884                  /* Push data if we have reached the expected data length */
1885                 if ((data->bytes_xfered + init_cnt) ==
1886                     (data->blksz * data->blocks))
1887                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
1888         }
1889 }
1890 
1891 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1892 {
1893 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1894         if (unlikely((unsigned long)buf & 0x3)) {
1895                 while (cnt >= 4) {
1896                         /* pull data from fifo into aligned buffer */
1897                         u32 aligned_buf[32];
1898                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1899                         int items = len >> 2;
1900                         int i;
1901                         for (i = 0; i < items; ++i)
1902                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
1903                         /* memcpy from aligned buffer into output buffer */
1904                         memcpy(buf, aligned_buf, len);
1905                         buf += len;
1906                         cnt -= len;
1907                 }
1908         } else
1909 #endif
1910         {
1911                 u32 *pdata = buf;
1912                 for (; cnt >= 4; cnt -= 4)
1913                         *pdata++ = mci_fifo_readl(host->fifo_reg);
1914                 buf = pdata;
1915         }
1916         if (cnt) {
1917                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
1918                 dw_mci_pull_final_bytes(host, buf, cnt);
1919         }
1920 }
1921 
1922 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1923 {
1924         struct mmc_data *data = host->data;
1925         int init_cnt = cnt;
1926 
1927         /* try and push anything in the part_buf */
1928         if (unlikely(host->part_buf_count)) {
1929                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1930                 buf += len;
1931                 cnt -= len;
1932 
1933                 if (host->part_buf_count == 8) {
1934                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
1935                         host->part_buf_count = 0;
1936                 }
1937         }
1938 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1939         if (unlikely((unsigned long)buf & 0x7)) {
1940                 while (cnt >= 8) {
1941                         u64 aligned_buf[16];
1942                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1943                         int items = len >> 3;
1944                         int i;
1945                         /* memcpy from input buffer into aligned buffer */
1946                         memcpy(aligned_buf, buf, len);
1947                         buf += len;
1948                         cnt -= len;
1949                         /* push data from aligned buffer into fifo */
1950                         for (i = 0; i < items; ++i)
1951                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
1952                 }
1953         } else
1954 #endif
1955         {
1956                 u64 *pdata = buf;
1957                 for (; cnt >= 8; cnt -= 8)
1958                         mci_fifo_writeq(host->fifo_reg, *pdata++);
1959                 buf = pdata;
1960         }
1961         /* put anything remaining in the part_buf */
1962         if (cnt) {
1963                 dw_mci_set_part_bytes(host, buf, cnt);
1964                 /* Push data if we have reached the expected data length */
1965                 if ((data->bytes_xfered + init_cnt) ==
1966                     (data->blksz * data->blocks))
1967                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
1968         }
1969 }
1970 
1971 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1972 {
1973 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1974         if (unlikely((unsigned long)buf & 0x7)) {
1975                 while (cnt >= 8) {
1976                         /* pull data from fifo into aligned buffer */
1977                         u64 aligned_buf[16];
1978                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1979                         int items = len >> 3;
1980                         int i;
1981                         for (i = 0; i < items; ++i)
1982                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
1983 
1984                         /* memcpy from aligned buffer into output buffer */
1985                         memcpy(buf, aligned_buf, len);
1986                         buf += len;
1987                         cnt -= len;
1988                 }
1989         } else
1990 #endif
1991         {
1992                 u64 *pdata = buf;
1993                 for (; cnt >= 8; cnt -= 8)
1994                         *pdata++ = mci_fifo_readq(host->fifo_reg);
1995                 buf = pdata;
1996         }
1997         if (cnt) {
1998                 host->part_buf = mci_fifo_readq(host->fifo_reg);
1999                 dw_mci_pull_final_bytes(host, buf, cnt);
2000         }
2001 }
2002 
2003 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2004 {
2005         int len;
2006 
2007         /* get remaining partial bytes */
2008         len = dw_mci_pull_part_bytes(host, buf, cnt);
2009         if (unlikely(len == cnt))
2010                 return;
2011         buf += len;
2012         cnt -= len;
2013 
2014         /* get the rest of the data */
2015         host->pull_data(host, buf, cnt);
2016 }
2017 
2018 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2019 {
2020         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2021         void *buf;
2022         unsigned int offset;
2023         struct mmc_data *data = host->data;
2024         int shift = host->data_shift;
2025         u32 status;
2026         unsigned int len;
2027         unsigned int remain, fcnt;
2028 
2029         do {
2030                 if (!sg_miter_next(sg_miter))
2031                         goto done;
2032 
2033                 host->sg = sg_miter->piter.sg;
2034                 buf = sg_miter->addr;
2035                 remain = sg_miter->length;
2036                 offset = 0;
2037 
2038                 do {
2039                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2040                                         << shift) + host->part_buf_count;
2041                         len = min(remain, fcnt);
2042                         if (!len)
2043                                 break;
2044                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2045                         data->bytes_xfered += len;
2046                         offset += len;
2047                         remain -= len;
2048                 } while (remain);
2049 
2050                 sg_miter->consumed = offset;
2051                 status = mci_readl(host, MINTSTS);
2052                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2053         /* if the RXDR is ready read again */
2054         } while ((status & SDMMC_INT_RXDR) ||
2055                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2056 
2057         if (!remain) {
2058                 if (!sg_miter_next(sg_miter))
2059                         goto done;
2060                 sg_miter->consumed = 0;
2061         }
2062         sg_miter_stop(sg_miter);
2063         return;
2064 
2065 done:
2066         sg_miter_stop(sg_miter);
2067         host->sg = NULL;
2068         smp_wmb();
2069         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2070 }
2071 
2072 static void dw_mci_write_data_pio(struct dw_mci *host)
2073 {
2074         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2075         void *buf;
2076         unsigned int offset;
2077         struct mmc_data *data = host->data;
2078         int shift = host->data_shift;
2079         u32 status;
2080         unsigned int len;
2081         unsigned int fifo_depth = host->fifo_depth;
2082         unsigned int remain, fcnt;
2083 
2084         do {
2085                 if (!sg_miter_next(sg_miter))
2086                         goto done;
2087 
2088                 host->sg = sg_miter->piter.sg;
2089                 buf = sg_miter->addr;
2090                 remain = sg_miter->length;
2091                 offset = 0;
2092 
2093                 do {
2094                         fcnt = ((fifo_depth -
2095                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2096                                         << shift) - host->part_buf_count;
2097                         len = min(remain, fcnt);
2098                         if (!len)
2099                                 break;
2100                         host->push_data(host, (void *)(buf + offset), len);
2101                         data->bytes_xfered += len;
2102                         offset += len;
2103                         remain -= len;
2104                 } while (remain);
2105 
2106                 sg_miter->consumed = offset;
2107                 status = mci_readl(host, MINTSTS);
2108                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2109         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2110 
2111         if (!remain) {
2112                 if (!sg_miter_next(sg_miter))
2113                         goto done;
2114                 sg_miter->consumed = 0;
2115         }
2116         sg_miter_stop(sg_miter);
2117         return;
2118 
2119 done:
2120         sg_miter_stop(sg_miter);
2121         host->sg = NULL;
2122         smp_wmb();
2123         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2124 }
2125 
2126 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2127 {
2128         if (!host->cmd_status)
2129                 host->cmd_status = status;
2130 
2131         smp_wmb();
2132 
2133         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2134         tasklet_schedule(&host->tasklet);
2135 }
2136 
2137 static void dw_mci_handle_cd(struct dw_mci *host)
2138 {
2139         int i;
2140 
2141         for (i = 0; i < host->num_slots; i++) {
2142                 struct dw_mci_slot *slot = host->slot[i];
2143 
2144                 if (!slot)
2145                         continue;
2146 
2147                 if (slot->mmc->ops->card_event)
2148                         slot->mmc->ops->card_event(slot->mmc);
2149                 mmc_detect_change(slot->mmc,
2150                         msecs_to_jiffies(host->pdata->detect_delay_ms));
2151         }
2152 }
2153 
2154 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2155 {
2156         struct dw_mci *host = dev_id;
2157         u32 pending;
2158         int i;
2159 
2160         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2161 
2162         /*
2163          * DTO fix - version 2.10a and below, and only if internal DMA
2164          * is configured.
2165          */
2166         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
2167                 if (!pending &&
2168                     ((mci_readl(host, STATUS) >> 17) & 0x1fff))
2169                         pending |= SDMMC_INT_DATA_OVER;
2170         }
2171 
2172         if (pending) {
2173                 /* Check volt switch first, since it can look like an error */
2174                 if ((host->state == STATE_SENDING_CMD11) &&
2175                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2176                         unsigned long irqflags;
2177 
2178                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2179                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2180 
2181                         /*
2182                          * Hold the lock; we know cmd11_timer can't be kicked
2183                          * off after the lock is released, so safe to delete.
2184                          */
2185                         spin_lock_irqsave(&host->irq_lock, irqflags);
2186                         dw_mci_cmd_interrupt(host, pending);
2187                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2188 
2189                         del_timer(&host->cmd11_timer);
2190                 }
2191 
2192                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2193                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2194                         host->cmd_status = pending;
2195                         smp_wmb();
2196                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2197                 }
2198 
2199                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2200                         /* if there is an error report DATA_ERROR */
2201                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2202                         host->data_status = pending;
2203                         smp_wmb();
2204                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2205                         tasklet_schedule(&host->tasklet);
2206                 }
2207 
2208                 if (pending & SDMMC_INT_DATA_OVER) {
2209                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2210                         if (!host->data_status)
2211                                 host->data_status = pending;
2212                         smp_wmb();
2213                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2214                                 if (host->sg != NULL)
2215                                         dw_mci_read_data_pio(host, true);
2216                         }
2217                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2218                         tasklet_schedule(&host->tasklet);
2219                 }
2220 
2221                 if (pending & SDMMC_INT_RXDR) {
2222                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2223                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2224                                 dw_mci_read_data_pio(host, false);
2225                 }
2226 
2227                 if (pending & SDMMC_INT_TXDR) {
2228                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2229                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2230                                 dw_mci_write_data_pio(host);
2231                 }
2232 
2233                 if (pending & SDMMC_INT_CMD_DONE) {
2234                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2235                         dw_mci_cmd_interrupt(host, pending);
2236                 }
2237 
2238                 if (pending & SDMMC_INT_CD) {
2239                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2240                         dw_mci_handle_cd(host);
2241                 }
2242 
2243                 /* Handle SDIO Interrupts */
2244                 for (i = 0; i < host->num_slots; i++) {
2245                         struct dw_mci_slot *slot = host->slot[i];
2246 
2247                         if (!slot)
2248                                 continue;
2249 
2250                         if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2251                                 mci_writel(host, RINTSTS,
2252                                            SDMMC_INT_SDIO(slot->sdio_id));
2253                                 mmc_signal_sdio_irq(slot->mmc);
2254                         }
2255                 }
2256 
2257         }
2258 
2259 #ifdef CONFIG_MMC_DW_IDMAC
2260         /* Handle DMA interrupts */
2261         if (host->dma_64bit_address == 1) {
2262                 pending = mci_readl(host, IDSTS64);
2263                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2264                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2265                                                         SDMMC_IDMAC_INT_RI);
2266                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2267                         host->dma_ops->complete(host);
2268                 }
2269         } else {
2270                 pending = mci_readl(host, IDSTS);
2271                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2272                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2273                                                         SDMMC_IDMAC_INT_RI);
2274                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2275                         host->dma_ops->complete(host);
2276                 }
2277         }
2278 #endif
2279 
2280         return IRQ_HANDLED;
2281 }
2282 
2283 #ifdef CONFIG_OF
2284 /* given a slot, find out the device node representing that slot */
2285 static struct device_node *dw_mci_of_find_slot_node(struct dw_mci_slot *slot)
2286 {
2287         struct device *dev = slot->mmc->parent;
2288         struct device_node *np;
2289         const __be32 *addr;
2290         int len;
2291 
2292         if (!dev || !dev->of_node)
2293                 return NULL;
2294 
2295         for_each_child_of_node(dev->of_node, np) {
2296                 addr = of_get_property(np, "reg", &len);
2297                 if (!addr || (len < sizeof(int)))
2298                         continue;
2299                 if (be32_to_cpup(addr) == slot->id)
2300                         return np;
2301         }
2302         return NULL;
2303 }
2304 
2305 static void dw_mci_slot_of_parse(struct dw_mci_slot *slot)
2306 {
2307         struct device_node *np = dw_mci_of_find_slot_node(slot);
2308 
2309         if (!np)
2310                 return;
2311 
2312         if (of_property_read_bool(np, "disable-wp")) {
2313                 slot->mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
2314                 dev_warn(slot->mmc->parent,
2315                         "Slot quirk 'disable-wp' is deprecated\n");
2316         }
2317 }
2318 #else /* CONFIG_OF */
2319 static void dw_mci_slot_of_parse(struct dw_mci_slot *slot)
2320 {
2321 }
2322 #endif /* CONFIG_OF */
2323 
2324 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2325 {
2326         struct mmc_host *mmc;
2327         struct dw_mci_slot *slot;
2328         const struct dw_mci_drv_data *drv_data = host->drv_data;
2329         int ctrl_id, ret;
2330         u32 freq[2];
2331 
2332         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2333         if (!mmc)
2334                 return -ENOMEM;
2335 
2336         slot = mmc_priv(mmc);
2337         slot->id = id;
2338         slot->sdio_id = host->sdio_id0 + id;
2339         slot->mmc = mmc;
2340         slot->host = host;
2341         host->slot[id] = slot;
2342 
2343         mmc->ops = &dw_mci_ops;
2344         if (of_property_read_u32_array(host->dev->of_node,
2345                                        "clock-freq-min-max", freq, 2)) {
2346                 mmc->f_min = DW_MCI_FREQ_MIN;
2347                 mmc->f_max = DW_MCI_FREQ_MAX;
2348         } else {
2349                 mmc->f_min = freq[0];
2350                 mmc->f_max = freq[1];
2351         }
2352 
2353         /*if there are external regulators, get them*/
2354         ret = mmc_regulator_get_supply(mmc);
2355         if (ret == -EPROBE_DEFER)
2356                 goto err_host_allocated;
2357 
2358         if (!mmc->ocr_avail)
2359                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2360 
2361         if (host->pdata->caps)
2362                 mmc->caps = host->pdata->caps;
2363 
2364         if (host->pdata->pm_caps)
2365                 mmc->pm_caps = host->pdata->pm_caps;
2366 
2367         if (host->dev->of_node) {
2368                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2369                 if (ctrl_id < 0)
2370                         ctrl_id = 0;
2371         } else {
2372                 ctrl_id = to_platform_device(host->dev)->id;
2373         }
2374         if (drv_data && drv_data->caps)
2375                 mmc->caps |= drv_data->caps[ctrl_id];
2376 
2377         if (host->pdata->caps2)
2378                 mmc->caps2 = host->pdata->caps2;
2379 
2380         dw_mci_slot_of_parse(slot);
2381 
2382         ret = mmc_of_parse(mmc);
2383         if (ret)
2384                 goto err_host_allocated;
2385 
2386         if (host->pdata->blk_settings) {
2387                 mmc->max_segs = host->pdata->blk_settings->max_segs;
2388                 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
2389                 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
2390                 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
2391                 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
2392         } else {
2393                 /* Useful defaults if platform data is unset. */
2394 #ifdef CONFIG_MMC_DW_IDMAC
2395                 mmc->max_segs = host->ring_size;
2396                 mmc->max_blk_size = 65536;
2397                 mmc->max_seg_size = 0x1000;
2398                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2399                 mmc->max_blk_count = mmc->max_req_size / 512;
2400 #else
2401                 mmc->max_segs = 64;
2402                 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
2403                 mmc->max_blk_count = 512;
2404                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2405                 mmc->max_seg_size = mmc->max_req_size;
2406 #endif /* CONFIG_MMC_DW_IDMAC */
2407         }
2408 
2409         if (dw_mci_get_cd(mmc))
2410                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2411         else
2412                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2413 
2414         ret = mmc_add_host(mmc);
2415         if (ret)
2416                 goto err_host_allocated;
2417 
2418 #if defined(CONFIG_DEBUG_FS)
2419         dw_mci_init_debugfs(slot);
2420 #endif
2421 
2422         return 0;
2423 
2424 err_host_allocated:
2425         mmc_free_host(mmc);
2426         return ret;
2427 }
2428 
2429 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2430 {
2431         /* Debugfs stuff is cleaned up by mmc core */
2432         mmc_remove_host(slot->mmc);
2433         slot->host->slot[id] = NULL;
2434         mmc_free_host(slot->mmc);
2435 }
2436 
2437 static void dw_mci_init_dma(struct dw_mci *host)
2438 {
2439         int addr_config;
2440         /* Check ADDR_CONFIG bit in HCON to find IDMAC address bus width */
2441         addr_config = (mci_readl(host, HCON) >> 27) & 0x01;
2442 
2443         if (addr_config == 1) {
2444                 /* host supports IDMAC in 64-bit address mode */
2445                 host->dma_64bit_address = 1;
2446                 dev_info(host->dev, "IDMAC supports 64-bit address mode.\n");
2447                 if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2448                         dma_set_coherent_mask(host->dev, DMA_BIT_MASK(64));
2449         } else {
2450                 /* host supports IDMAC in 32-bit address mode */
2451                 host->dma_64bit_address = 0;
2452                 dev_info(host->dev, "IDMAC supports 32-bit address mode.\n");
2453         }
2454 
2455         /* Alloc memory for sg translation */
2456         host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2457                                           &host->sg_dma, GFP_KERNEL);
2458         if (!host->sg_cpu) {
2459                 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2460                         __func__);
2461                 goto no_dma;
2462         }
2463 
2464         /* Determine which DMA interface to use */
2465 #ifdef CONFIG_MMC_DW_IDMAC
2466         host->dma_ops = &dw_mci_idmac_ops;
2467         dev_info(host->dev, "Using internal DMA controller.\n");
2468 #endif
2469 
2470         if (!host->dma_ops)
2471                 goto no_dma;
2472 
2473         if (host->dma_ops->init && host->dma_ops->start &&
2474             host->dma_ops->stop && host->dma_ops->cleanup) {
2475                 if (host->dma_ops->init(host)) {
2476                         dev_err(host->dev, "%s: Unable to initialize "
2477                                 "DMA Controller.\n", __func__);
2478                         goto no_dma;
2479                 }
2480         } else {
2481                 dev_err(host->dev, "DMA initialization not found.\n");
2482                 goto no_dma;
2483         }
2484 
2485         host->use_dma = 1;
2486         return;
2487 
2488 no_dma:
2489         dev_info(host->dev, "Using PIO mode.\n");
2490         host->use_dma = 0;
2491         return;
2492 }
2493 
2494 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2495 {
2496         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2497         u32 ctrl;
2498 
2499         ctrl = mci_readl(host, CTRL);
2500         ctrl |= reset;
2501         mci_writel(host, CTRL, ctrl);
2502 
2503         /* wait till resets clear */
2504         do {
2505                 ctrl = mci_readl(host, CTRL);
2506                 if (!(ctrl & reset))
2507                         return true;
2508         } while (time_before(jiffies, timeout));
2509 
2510         dev_err(host->dev,
2511                 "Timeout resetting block (ctrl reset %#x)\n",
2512                 ctrl & reset);
2513 
2514         return false;
2515 }
2516 
2517 static bool dw_mci_reset(struct dw_mci *host)
2518 {
2519         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2520         bool ret = false;
2521 
2522         /*
2523          * Reseting generates a block interrupt, hence setting
2524          * the scatter-gather pointer to NULL.
2525          */
2526         if (host->sg) {
2527                 sg_miter_stop(&host->sg_miter);
2528                 host->sg = NULL;
2529         }
2530 
2531         if (host->use_dma)
2532                 flags |= SDMMC_CTRL_DMA_RESET;
2533 
2534         if (dw_mci_ctrl_reset(host, flags)) {
2535                 /*
2536                  * In all cases we clear the RAWINTS register to clear any
2537                  * interrupts.
2538                  */
2539                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2540 
2541                 /* if using dma we wait for dma_req to clear */
2542                 if (host->use_dma) {
2543                         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2544                         u32 status;
2545                         do {
2546                                 status = mci_readl(host, STATUS);
2547                                 if (!(status & SDMMC_STATUS_DMA_REQ))
2548                                         break;
2549                                 cpu_relax();
2550                         } while (time_before(jiffies, timeout));
2551 
2552                         if (status & SDMMC_STATUS_DMA_REQ) {
2553                                 dev_err(host->dev,
2554                                         "%s: Timeout waiting for dma_req to "
2555                                         "clear during reset\n", __func__);
2556                                 goto ciu_out;
2557                         }
2558 
2559                         /* when using DMA next we reset the fifo again */
2560                         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2561                                 goto ciu_out;
2562                 }
2563         } else {
2564                 /* if the controller reset bit did clear, then set clock regs */
2565                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2566                         dev_err(host->dev, "%s: fifo/dma reset bits didn't "
2567                                 "clear but ciu was reset, doing clock update\n",
2568                                 __func__);
2569                         goto ciu_out;
2570                 }
2571         }
2572 
2573 #if IS_ENABLED(CONFIG_MMC_DW_IDMAC)
2574         /* It is also recommended that we reset and reprogram idmac */
2575         dw_mci_idmac_reset(host);
2576 #endif
2577 
2578         ret = true;
2579 
2580 ciu_out:
2581         /* After a CTRL reset we need to have CIU set clock registers  */
2582         mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2583 
2584         return ret;
2585 }
2586 
2587 static void dw_mci_cmd11_timer(unsigned long arg)
2588 {
2589         struct dw_mci *host = (struct dw_mci *)arg;
2590 
2591         if (host->state != STATE_SENDING_CMD11) {
2592                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
2593                 return;
2594         }
2595 
2596         host->cmd_status = SDMMC_INT_RTO;
2597         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2598         tasklet_schedule(&host->tasklet);
2599 }
2600 
2601 #ifdef CONFIG_OF
2602 static struct dw_mci_of_quirks {
2603         char *quirk;
2604         int id;
2605 } of_quirks[] = {
2606         {
2607                 .quirk  = "broken-cd",
2608                 .id     = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2609         },
2610 };
2611 
2612 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2613 {
2614         struct dw_mci_board *pdata;
2615         struct device *dev = host->dev;
2616         struct device_node *np = dev->of_node;
2617         const struct dw_mci_drv_data *drv_data = host->drv_data;
2618         int idx, ret;
2619         u32 clock_frequency;
2620 
2621         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2622         if (!pdata)
2623                 return ERR_PTR(-ENOMEM);
2624 
2625         /* find out number of slots supported */
2626         if (of_property_read_u32(dev->of_node, "num-slots",
2627                                 &pdata->num_slots)) {
2628                 dev_info(dev, "num-slots property not found, "
2629                                 "assuming 1 slot is available\n");
2630                 pdata->num_slots = 1;
2631         }
2632 
2633         /* get quirks */
2634         for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2635                 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2636                         pdata->quirks |= of_quirks[idx].id;
2637 
2638         if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2639                 dev_info(dev, "fifo-depth property not found, using "
2640                                 "value of FIFOTH register as default\n");
2641 
2642         of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2643 
2644         if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2645                 pdata->bus_hz = clock_frequency;
2646 
2647         if (drv_data && drv_data->parse_dt) {
2648                 ret = drv_data->parse_dt(host);
2649                 if (ret)
2650                         return ERR_PTR(ret);
2651         }
2652 
2653         if (of_find_property(np, "supports-highspeed", NULL))
2654                 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2655 
2656         return pdata;
2657 }
2658 
2659 #else /* CONFIG_OF */
2660 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2661 {
2662         return ERR_PTR(-EINVAL);
2663 }
2664 #endif /* CONFIG_OF */
2665 
2666 static void dw_mci_enable_cd(struct dw_mci *host)
2667 {
2668         struct dw_mci_board *brd = host->pdata;
2669         unsigned long irqflags;
2670         u32 temp;
2671         int i;
2672 
2673         /* No need for CD if broken card detection */
2674         if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
2675                 return;
2676 
2677         /* No need for CD if all slots have a non-error GPIO */
2678         for (i = 0; i < host->num_slots; i++) {
2679                 struct dw_mci_slot *slot = host->slot[i];
2680 
2681                 if (IS_ERR_VALUE(mmc_gpio_get_cd(slot->mmc)))
2682                         break;
2683         }
2684         if (i == host->num_slots)
2685                 return;
2686 
2687         spin_lock_irqsave(&host->irq_lock, irqflags);
2688         temp = mci_readl(host, INTMASK);
2689         temp  |= SDMMC_INT_CD;
2690         mci_writel(host, INTMASK, temp);
2691         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2692 }
2693 
2694 int dw_mci_probe(struct dw_mci *host)
2695 {
2696         const struct dw_mci_drv_data *drv_data = host->drv_data;
2697         int width, i, ret = 0;
2698         u32 fifo_size;
2699         int init_slots = 0;
2700 
2701         if (!host->pdata) {
2702                 host->pdata = dw_mci_parse_dt(host);
2703                 if (IS_ERR(host->pdata)) {
2704                         dev_err(host->dev, "platform data not available\n");
2705                         return -EINVAL;
2706                 }
2707         }
2708 
2709         if (host->pdata->num_slots > 1) {
2710                 dev_err(host->dev,
2711                         "Platform data must supply num_slots.\n");
2712                 return -ENODEV;
2713         }
2714 
2715         host->biu_clk = devm_clk_get(host->dev, "biu");
2716         if (IS_ERR(host->biu_clk)) {
2717                 dev_dbg(host->dev, "biu clock not available\n");
2718         } else {
2719                 ret = clk_prepare_enable(host->biu_clk);
2720                 if (ret) {
2721                         dev_err(host->dev, "failed to enable biu clock\n");
2722                         return ret;
2723                 }
2724         }
2725 
2726         host->ciu_clk = devm_clk_get(host->dev, "ciu");
2727         if (IS_ERR(host->ciu_clk)) {
2728                 dev_dbg(host->dev, "ciu clock not available\n");
2729                 host->bus_hz = host->pdata->bus_hz;
2730         } else {
2731                 ret = clk_prepare_enable(host->ciu_clk);
2732                 if (ret) {
2733                         dev_err(host->dev, "failed to enable ciu clock\n");
2734                         goto err_clk_biu;
2735                 }
2736 
2737                 if (host->pdata->bus_hz) {
2738                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2739                         if (ret)
2740                                 dev_warn(host->dev,
2741                                          "Unable to set bus rate to %uHz\n",
2742                                          host->pdata->bus_hz);
2743                 }
2744                 host->bus_hz = clk_get_rate(host->ciu_clk);
2745         }
2746 
2747         if (!host->bus_hz) {
2748                 dev_err(host->dev,
2749                         "Platform data must supply bus speed\n");
2750                 ret = -ENODEV;
2751                 goto err_clk_ciu;
2752         }
2753 
2754         if (drv_data && drv_data->init) {
2755                 ret = drv_data->init(host);
2756                 if (ret) {
2757                         dev_err(host->dev,
2758                                 "implementation specific init failed\n");
2759                         goto err_clk_ciu;
2760                 }
2761         }
2762 
2763         if (drv_data && drv_data->setup_clock) {
2764                 ret = drv_data->setup_clock(host);
2765                 if (ret) {
2766                         dev_err(host->dev,
2767                                 "implementation specific clock setup failed\n");
2768                         goto err_clk_ciu;
2769                 }
2770         }
2771 
2772         setup_timer(&host->cmd11_timer,
2773                     dw_mci_cmd11_timer, (unsigned long)host);
2774 
2775         host->quirks = host->pdata->quirks;
2776 
2777         spin_lock_init(&host->lock);
2778         spin_lock_init(&host->irq_lock);
2779         INIT_LIST_HEAD(&host->queue);
2780 
2781         /*
2782          * Get the host data width - this assumes that HCON has been set with
2783          * the correct values.
2784          */
2785         i = (mci_readl(host, HCON) >> 7) & 0x7;
2786         if (!i) {
2787                 host->push_data = dw_mci_push_data16;
2788                 host->pull_data = dw_mci_pull_data16;
2789                 width = 16;
2790                 host->data_shift = 1;
2791         } else if (i == 2) {
2792                 host->push_data = dw_mci_push_data64;
2793                 host->pull_data = dw_mci_pull_data64;
2794                 width = 64;
2795                 host->data_shift = 3;
2796         } else {
2797                 /* Check for a reserved value, and warn if it is */
2798                 WARN((i != 1),
2799                      "HCON reports a reserved host data width!\n"
2800                      "Defaulting to 32-bit access.\n");
2801                 host->push_data = dw_mci_push_data32;
2802                 host->pull_data = dw_mci_pull_data32;
2803                 width = 32;
2804                 host->data_shift = 2;
2805         }
2806 
2807         /* Reset all blocks */
2808         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS))
2809                 return -ENODEV;
2810 
2811         host->dma_ops = host->pdata->dma_ops;
2812         dw_mci_init_dma(host);
2813 
2814         /* Clear the interrupts for the host controller */
2815         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2816         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2817 
2818         /* Put in max timeout */
2819         mci_writel(host, TMOUT, 0xFFFFFFFF);
2820 
2821         /*
2822          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
2823          *                          Tx Mark = fifo_size / 2 DMA Size = 8
2824          */
2825         if (!host->pdata->fifo_depth) {
2826                 /*
2827                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2828                  * have been overwritten by the bootloader, just like we're
2829                  * about to do, so if you know the value for your hardware, you
2830                  * should put it in the platform data.
2831                  */
2832                 fifo_size = mci_readl(host, FIFOTH);
2833                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2834         } else {
2835                 fifo_size = host->pdata->fifo_depth;
2836         }
2837         host->fifo_depth = fifo_size;
2838         host->fifoth_val =
2839                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
2840         mci_writel(host, FIFOTH, host->fifoth_val);
2841 
2842         /* disable clock to CIU */
2843         mci_writel(host, CLKENA, 0);
2844         mci_writel(host, CLKSRC, 0);
2845 
2846         /*
2847          * In 2.40a spec, Data offset is changed.
2848          * Need to check the version-id and set data-offset for DATA register.
2849          */
2850         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2851         dev_info(host->dev, "Version ID is %04x\n", host->verid);
2852 
2853         if (host->verid < DW_MMC_240A)
2854                 host->fifo_reg = host->regs + DATA_OFFSET;
2855         else
2856                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
2857 
2858         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2859         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2860                                host->irq_flags, "dw-mci", host);
2861         if (ret)
2862                 goto err_dmaunmap;
2863 
2864         if (host->pdata->num_slots)
2865                 host->num_slots = host->pdata->num_slots;
2866         else
2867                 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2868 
2869         /*
2870          * Enable interrupts for command done, data over, data empty,
2871          * receive ready and error such as transmit, receive timeout, crc error
2872          */
2873         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2874         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2875                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2876                    DW_MCI_ERROR_FLAGS);
2877         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2878 
2879         dev_info(host->dev, "DW MMC controller at irq %d, "
2880                  "%d bit host data width, "
2881                  "%u deep fifo\n",
2882                  host->irq, width, fifo_size);
2883 
2884         /* We need at least one slot to succeed */
2885         for (i = 0; i < host->num_slots; i++) {
2886                 ret = dw_mci_init_slot(host, i);
2887                 if (ret)
2888                         dev_dbg(host->dev, "slot %d init failed\n", i);
2889                 else
2890                         init_slots++;
2891         }
2892 
2893         if (init_slots) {
2894                 dev_info(host->dev, "%d slots initialized\n", init_slots);
2895         } else {
2896                 dev_dbg(host->dev, "attempted to initialize %d slots, "
2897                                         "but failed on all\n", host->num_slots);
2898                 goto err_dmaunmap;
2899         }
2900 
2901         /* Now that slots are all setup, we can enable card detect */
2902         dw_mci_enable_cd(host);
2903 
2904         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2905                 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2906 
2907         return 0;
2908 
2909 err_dmaunmap:
2910         if (host->use_dma && host->dma_ops->exit)
2911                 host->dma_ops->exit(host);
2912 
2913 err_clk_ciu:
2914         if (!IS_ERR(host->ciu_clk))
2915                 clk_disable_unprepare(host->ciu_clk);
2916 
2917 err_clk_biu:
2918         if (!IS_ERR(host->biu_clk))
2919                 clk_disable_unprepare(host->biu_clk);
2920 
2921         return ret;
2922 }
2923 EXPORT_SYMBOL(dw_mci_probe);
2924 
2925 void dw_mci_remove(struct dw_mci *host)
2926 {
2927         int i;
2928 
2929         for (i = 0; i < host->num_slots; i++) {
2930                 dev_dbg(host->dev, "remove slot %d\n", i);
2931                 if (host->slot[i])
2932                         dw_mci_cleanup_slot(host->slot[i], i);
2933         }
2934 
2935         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2936         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2937 
2938         /* disable clock to CIU */
2939         mci_writel(host, CLKENA, 0);
2940         mci_writel(host, CLKSRC, 0);
2941 
2942         if (host->use_dma && host->dma_ops->exit)
2943                 host->dma_ops->exit(host);
2944 
2945         if (!IS_ERR(host->ciu_clk))
2946                 clk_disable_unprepare(host->ciu_clk);
2947 
2948         if (!IS_ERR(host->biu_clk))
2949                 clk_disable_unprepare(host->biu_clk);
2950 }
2951 EXPORT_SYMBOL(dw_mci_remove);
2952 
2953 
2954 
2955 #ifdef CONFIG_PM_SLEEP
2956 /*
2957  * TODO: we should probably disable the clock to the card in the suspend path.
2958  */
2959 int dw_mci_suspend(struct dw_mci *host)
2960 {
2961         return 0;
2962 }
2963 EXPORT_SYMBOL(dw_mci_suspend);
2964 
2965 int dw_mci_resume(struct dw_mci *host)
2966 {
2967         int i, ret;
2968 
2969         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
2970                 ret = -ENODEV;
2971                 return ret;
2972         }
2973 
2974         if (host->use_dma && host->dma_ops->init)
2975                 host->dma_ops->init(host);
2976 
2977         /*
2978          * Restore the initial value at FIFOTH register
2979          * And Invalidate the prev_blksz with zero
2980          */
2981         mci_writel(host, FIFOTH, host->fifoth_val);
2982         host->prev_blksz = 0;
2983 
2984         /* Put in max timeout */
2985         mci_writel(host, TMOUT, 0xFFFFFFFF);
2986 
2987         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2988         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2989                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2990                    DW_MCI_ERROR_FLAGS);
2991         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2992 
2993         for (i = 0; i < host->num_slots; i++) {
2994                 struct dw_mci_slot *slot = host->slot[i];
2995                 if (!slot)
2996                         continue;
2997                 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2998                         dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2999                         dw_mci_setup_bus(slot, true);
3000                 }
3001         }
3002 
3003         /* Now that slots are all setup, we can enable card detect */
3004         dw_mci_enable_cd(host);
3005 
3006         return 0;
3007 }
3008 EXPORT_SYMBOL(dw_mci_resume);
3009 #endif /* CONFIG_PM_SLEEP */
3010 
3011 static int __init dw_mci_init(void)
3012 {
3013         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3014         return 0;
3015 }
3016 
3017 static void __exit dw_mci_exit(void)
3018 {
3019 }
3020 
3021 module_init(dw_mci_init);
3022 module_exit(dw_mci_exit);
3023 
3024 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3025 MODULE_AUTHOR("NXP Semiconductor VietNam");
3026 MODULE_AUTHOR("Imagination Technologies Ltd");
3027 MODULE_LICENSE("GPL v2");
3028 

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