Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 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

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/host.h>
 31 #include <linux/mmc/mmc.h>
 32 #include <linux/mmc/sd.h>
 33 #include <linux/mmc/sdio.h>
 34 #include <linux/mmc/dw_mmc.h>
 35 #include <linux/bitops.h>
 36 #include <linux/regulator/consumer.h>
 37 #include <linux/workqueue.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 {
 66         u32             des0;   /* Control Descriptor */
 67 #define IDMAC_DES0_DIC  BIT(1)
 68 #define IDMAC_DES0_LD   BIT(2)
 69 #define IDMAC_DES0_FD   BIT(3)
 70 #define IDMAC_DES0_CH   BIT(4)
 71 #define IDMAC_DES0_ER   BIT(5)
 72 #define IDMAC_DES0_CES  BIT(30)
 73 #define IDMAC_DES0_OWN  BIT(31)
 74 
 75         u32             des1;   /* Buffer sizes */
 76 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 77         ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
 78 
 79         u32             des2;   /* buffer 1 physical address */
 80 
 81         u32             des3;   /* buffer 2 physical address */
 82 };
 83 #endif /* CONFIG_MMC_DW_IDMAC */
 84 
 85 static bool dw_mci_reset(struct dw_mci *host);
 86 
 87 #if defined(CONFIG_DEBUG_FS)
 88 static int dw_mci_req_show(struct seq_file *s, void *v)
 89 {
 90         struct dw_mci_slot *slot = s->private;
 91         struct mmc_request *mrq;
 92         struct mmc_command *cmd;
 93         struct mmc_command *stop;
 94         struct mmc_data *data;
 95 
 96         /* Make sure we get a consistent snapshot */
 97         spin_lock_bh(&slot->host->lock);
 98         mrq = slot->mrq;
 99 
100         if (mrq) {
101                 cmd = mrq->cmd;
102                 data = mrq->data;
103                 stop = mrq->stop;
104 
105                 if (cmd)
106                         seq_printf(s,
107                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
108                                    cmd->opcode, cmd->arg, cmd->flags,
109                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
110                                    cmd->resp[2], cmd->error);
111                 if (data)
112                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
113                                    data->bytes_xfered, data->blocks,
114                                    data->blksz, data->flags, data->error);
115                 if (stop)
116                         seq_printf(s,
117                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
118                                    stop->opcode, stop->arg, stop->flags,
119                                    stop->resp[0], stop->resp[1], stop->resp[2],
120                                    stop->resp[2], stop->error);
121         }
122 
123         spin_unlock_bh(&slot->host->lock);
124 
125         return 0;
126 }
127 
128 static int dw_mci_req_open(struct inode *inode, struct file *file)
129 {
130         return single_open(file, dw_mci_req_show, inode->i_private);
131 }
132 
133 static const struct file_operations dw_mci_req_fops = {
134         .owner          = THIS_MODULE,
135         .open           = dw_mci_req_open,
136         .read           = seq_read,
137         .llseek         = seq_lseek,
138         .release        = single_release,
139 };
140 
141 static int dw_mci_regs_show(struct seq_file *s, void *v)
142 {
143         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
144         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
145         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
146         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
147         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
148         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
149 
150         return 0;
151 }
152 
153 static int dw_mci_regs_open(struct inode *inode, struct file *file)
154 {
155         return single_open(file, dw_mci_regs_show, inode->i_private);
156 }
157 
158 static const struct file_operations dw_mci_regs_fops = {
159         .owner          = THIS_MODULE,
160         .open           = dw_mci_regs_open,
161         .read           = seq_read,
162         .llseek         = seq_lseek,
163         .release        = single_release,
164 };
165 
166 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
167 {
168         struct mmc_host *mmc = slot->mmc;
169         struct dw_mci *host = slot->host;
170         struct dentry *root;
171         struct dentry *node;
172 
173         root = mmc->debugfs_root;
174         if (!root)
175                 return;
176 
177         node = debugfs_create_file("regs", S_IRUSR, root, host,
178                                    &dw_mci_regs_fops);
179         if (!node)
180                 goto err;
181 
182         node = debugfs_create_file("req", S_IRUSR, root, slot,
183                                    &dw_mci_req_fops);
184         if (!node)
185                 goto err;
186 
187         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
188         if (!node)
189                 goto err;
190 
191         node = debugfs_create_x32("pending_events", S_IRUSR, root,
192                                   (u32 *)&host->pending_events);
193         if (!node)
194                 goto err;
195 
196         node = debugfs_create_x32("completed_events", S_IRUSR, root,
197                                   (u32 *)&host->completed_events);
198         if (!node)
199                 goto err;
200 
201         return;
202 
203 err:
204         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
205 }
206 #endif /* defined(CONFIG_DEBUG_FS) */
207 
208 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
209 
210 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
211 {
212         struct mmc_data *data;
213         struct dw_mci_slot *slot = mmc_priv(mmc);
214         struct dw_mci *host = slot->host;
215         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
216         u32 cmdr;
217         cmd->error = -EINPROGRESS;
218 
219         cmdr = cmd->opcode;
220 
221         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
222             cmd->opcode == MMC_GO_IDLE_STATE ||
223             cmd->opcode == MMC_GO_INACTIVE_STATE ||
224             (cmd->opcode == SD_IO_RW_DIRECT &&
225              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
226                 cmdr |= SDMMC_CMD_STOP;
227         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
228                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
229 
230         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
231                 u32 clk_en_a;
232 
233                 /* Special bit makes CMD11 not die */
234                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
235 
236                 /* Change state to continue to handle CMD11 weirdness */
237                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
238                 slot->host->state = STATE_SENDING_CMD11;
239 
240                 /*
241                  * We need to disable low power mode (automatic clock stop)
242                  * while doing voltage switch so we don't confuse the card,
243                  * since stopping the clock is a specific part of the UHS
244                  * voltage change dance.
245                  *
246                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
247                  * unconditionally turned back on in dw_mci_setup_bus() if it's
248                  * ever called with a non-zero clock.  That shouldn't happen
249                  * until the voltage change is all done.
250                  */
251                 clk_en_a = mci_readl(host, CLKENA);
252                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
253                 mci_writel(host, CLKENA, clk_en_a);
254                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
255                              SDMMC_CMD_PRV_DAT_WAIT, 0);
256         }
257 
258         if (cmd->flags & MMC_RSP_PRESENT) {
259                 /* We expect a response, so set this bit */
260                 cmdr |= SDMMC_CMD_RESP_EXP;
261                 if (cmd->flags & MMC_RSP_136)
262                         cmdr |= SDMMC_CMD_RESP_LONG;
263         }
264 
265         if (cmd->flags & MMC_RSP_CRC)
266                 cmdr |= SDMMC_CMD_RESP_CRC;
267 
268         data = cmd->data;
269         if (data) {
270                 cmdr |= SDMMC_CMD_DAT_EXP;
271                 if (data->flags & MMC_DATA_STREAM)
272                         cmdr |= SDMMC_CMD_STRM_MODE;
273                 if (data->flags & MMC_DATA_WRITE)
274                         cmdr |= SDMMC_CMD_DAT_WR;
275         }
276 
277         if (drv_data && drv_data->prepare_command)
278                 drv_data->prepare_command(slot->host, &cmdr);
279 
280         return cmdr;
281 }
282 
283 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
284 {
285         struct mmc_command *stop;
286         u32 cmdr;
287 
288         if (!cmd->data)
289                 return 0;
290 
291         stop = &host->stop_abort;
292         cmdr = cmd->opcode;
293         memset(stop, 0, sizeof(struct mmc_command));
294 
295         if (cmdr == MMC_READ_SINGLE_BLOCK ||
296             cmdr == MMC_READ_MULTIPLE_BLOCK ||
297             cmdr == MMC_WRITE_BLOCK ||
298             cmdr == MMC_WRITE_MULTIPLE_BLOCK) {
299                 stop->opcode = MMC_STOP_TRANSMISSION;
300                 stop->arg = 0;
301                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
302         } else if (cmdr == SD_IO_RW_EXTENDED) {
303                 stop->opcode = SD_IO_RW_DIRECT;
304                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
305                              ((cmd->arg >> 28) & 0x7);
306                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
307         } else {
308                 return 0;
309         }
310 
311         cmdr = stop->opcode | SDMMC_CMD_STOP |
312                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
313 
314         return cmdr;
315 }
316 
317 static void dw_mci_start_command(struct dw_mci *host,
318                                  struct mmc_command *cmd, u32 cmd_flags)
319 {
320         host->cmd = cmd;
321         dev_vdbg(host->dev,
322                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
323                  cmd->arg, cmd_flags);
324 
325         mci_writel(host, CMDARG, cmd->arg);
326         wmb();
327 
328         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
329 }
330 
331 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
332 {
333         struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
334         dw_mci_start_command(host, stop, host->stop_cmdr);
335 }
336 
337 /* DMA interface functions */
338 static void dw_mci_stop_dma(struct dw_mci *host)
339 {
340         if (host->using_dma) {
341                 host->dma_ops->stop(host);
342                 host->dma_ops->cleanup(host);
343         }
344 
345         /* Data transfer was stopped by the interrupt handler */
346         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
347 }
348 
349 static int dw_mci_get_dma_dir(struct mmc_data *data)
350 {
351         if (data->flags & MMC_DATA_WRITE)
352                 return DMA_TO_DEVICE;
353         else
354                 return DMA_FROM_DEVICE;
355 }
356 
357 #ifdef CONFIG_MMC_DW_IDMAC
358 static void dw_mci_dma_cleanup(struct dw_mci *host)
359 {
360         struct mmc_data *data = host->data;
361 
362         if (data)
363                 if (!data->host_cookie)
364                         dma_unmap_sg(host->dev,
365                                      data->sg,
366                                      data->sg_len,
367                                      dw_mci_get_dma_dir(data));
368 }
369 
370 static void dw_mci_idmac_reset(struct dw_mci *host)
371 {
372         u32 bmod = mci_readl(host, BMOD);
373         /* Software reset of DMA */
374         bmod |= SDMMC_IDMAC_SWRESET;
375         mci_writel(host, BMOD, bmod);
376 }
377 
378 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
379 {
380         u32 temp;
381 
382         /* Disable and reset the IDMAC interface */
383         temp = mci_readl(host, CTRL);
384         temp &= ~SDMMC_CTRL_USE_IDMAC;
385         temp |= SDMMC_CTRL_DMA_RESET;
386         mci_writel(host, CTRL, temp);
387 
388         /* Stop the IDMAC running */
389         temp = mci_readl(host, BMOD);
390         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
391         temp |= SDMMC_IDMAC_SWRESET;
392         mci_writel(host, BMOD, temp);
393 }
394 
395 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
396 {
397         struct mmc_data *data = host->data;
398 
399         dev_vdbg(host->dev, "DMA complete\n");
400 
401         host->dma_ops->cleanup(host);
402 
403         /*
404          * If the card was removed, data will be NULL. No point in trying to
405          * send the stop command or waiting for NBUSY in this case.
406          */
407         if (data) {
408                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
409                 tasklet_schedule(&host->tasklet);
410         }
411 }
412 
413 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
414                                     unsigned int sg_len)
415 {
416         int i;
417         struct idmac_desc *desc = host->sg_cpu;
418 
419         for (i = 0; i < sg_len; i++, desc++) {
420                 unsigned int length = sg_dma_len(&data->sg[i]);
421                 u32 mem_addr = sg_dma_address(&data->sg[i]);
422 
423                 /* Set the OWN bit and disable interrupts for this descriptor */
424                 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
425 
426                 /* Buffer length */
427                 IDMAC_SET_BUFFER1_SIZE(desc, length);
428 
429                 /* Physical address to DMA to/from */
430                 desc->des2 = mem_addr;
431         }
432 
433         /* Set first descriptor */
434         desc = host->sg_cpu;
435         desc->des0 |= IDMAC_DES0_FD;
436 
437         /* Set last descriptor */
438         desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
439         desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
440         desc->des0 |= IDMAC_DES0_LD;
441 
442         wmb();
443 }
444 
445 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
446 {
447         u32 temp;
448 
449         dw_mci_translate_sglist(host, host->data, sg_len);
450 
451         /* Select IDMAC interface */
452         temp = mci_readl(host, CTRL);
453         temp |= SDMMC_CTRL_USE_IDMAC;
454         mci_writel(host, CTRL, temp);
455 
456         wmb();
457 
458         /* Enable the IDMAC */
459         temp = mci_readl(host, BMOD);
460         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
461         mci_writel(host, BMOD, temp);
462 
463         /* Start it running */
464         mci_writel(host, PLDMND, 1);
465 }
466 
467 static int dw_mci_idmac_init(struct dw_mci *host)
468 {
469         struct idmac_desc *p;
470         int i;
471 
472         /* Number of descriptors in the ring buffer */
473         host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
474 
475         /* Forward link the descriptor list */
476         for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
477                 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
478 
479         /* Set the last descriptor as the end-of-ring descriptor */
480         p->des3 = host->sg_dma;
481         p->des0 = IDMAC_DES0_ER;
482 
483         dw_mci_idmac_reset(host);
484 
485         /* Mask out interrupts - get Tx & Rx complete only */
486         mci_writel(host, IDSTS, IDMAC_INT_CLR);
487         mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
488                    SDMMC_IDMAC_INT_TI);
489 
490         /* Set the descriptor base address */
491         mci_writel(host, DBADDR, host->sg_dma);
492         return 0;
493 }
494 
495 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
496         .init = dw_mci_idmac_init,
497         .start = dw_mci_idmac_start_dma,
498         .stop = dw_mci_idmac_stop_dma,
499         .complete = dw_mci_idmac_complete_dma,
500         .cleanup = dw_mci_dma_cleanup,
501 };
502 #endif /* CONFIG_MMC_DW_IDMAC */
503 
504 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
505                                    struct mmc_data *data,
506                                    bool next)
507 {
508         struct scatterlist *sg;
509         unsigned int i, sg_len;
510 
511         if (!next && data->host_cookie)
512                 return data->host_cookie;
513 
514         /*
515          * We don't do DMA on "complex" transfers, i.e. with
516          * non-word-aligned buffers or lengths. Also, we don't bother
517          * with all the DMA setup overhead for short transfers.
518          */
519         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
520                 return -EINVAL;
521 
522         if (data->blksz & 3)
523                 return -EINVAL;
524 
525         for_each_sg(data->sg, sg, data->sg_len, i) {
526                 if (sg->offset & 3 || sg->length & 3)
527                         return -EINVAL;
528         }
529 
530         sg_len = dma_map_sg(host->dev,
531                             data->sg,
532                             data->sg_len,
533                             dw_mci_get_dma_dir(data));
534         if (sg_len == 0)
535                 return -EINVAL;
536 
537         if (next)
538                 data->host_cookie = sg_len;
539 
540         return sg_len;
541 }
542 
543 static void dw_mci_pre_req(struct mmc_host *mmc,
544                            struct mmc_request *mrq,
545                            bool is_first_req)
546 {
547         struct dw_mci_slot *slot = mmc_priv(mmc);
548         struct mmc_data *data = mrq->data;
549 
550         if (!slot->host->use_dma || !data)
551                 return;
552 
553         if (data->host_cookie) {
554                 data->host_cookie = 0;
555                 return;
556         }
557 
558         if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
559                 data->host_cookie = 0;
560 }
561 
562 static void dw_mci_post_req(struct mmc_host *mmc,
563                             struct mmc_request *mrq,
564                             int err)
565 {
566         struct dw_mci_slot *slot = mmc_priv(mmc);
567         struct mmc_data *data = mrq->data;
568 
569         if (!slot->host->use_dma || !data)
570                 return;
571 
572         if (data->host_cookie)
573                 dma_unmap_sg(slot->host->dev,
574                              data->sg,
575                              data->sg_len,
576                              dw_mci_get_dma_dir(data));
577         data->host_cookie = 0;
578 }
579 
580 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
581 {
582 #ifdef CONFIG_MMC_DW_IDMAC
583         unsigned int blksz = data->blksz;
584         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
585         u32 fifo_width = 1 << host->data_shift;
586         u32 blksz_depth = blksz / fifo_width, fifoth_val;
587         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
588         int idx = (sizeof(mszs) / sizeof(mszs[0])) - 1;
589 
590         tx_wmark = (host->fifo_depth) / 2;
591         tx_wmark_invers = host->fifo_depth - tx_wmark;
592 
593         /*
594          * MSIZE is '1',
595          * if blksz is not a multiple of the FIFO width
596          */
597         if (blksz % fifo_width) {
598                 msize = 0;
599                 rx_wmark = 1;
600                 goto done;
601         }
602 
603         do {
604                 if (!((blksz_depth % mszs[idx]) ||
605                      (tx_wmark_invers % mszs[idx]))) {
606                         msize = idx;
607                         rx_wmark = mszs[idx] - 1;
608                         break;
609                 }
610         } while (--idx > 0);
611         /*
612          * If idx is '', it won't be tried
613          * Thus, initial values are uesed
614          */
615 done:
616         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
617         mci_writel(host, FIFOTH, fifoth_val);
618 #endif
619 }
620 
621 static void dw_mci_ctrl_rd_thld(struct dw_mci *host, struct mmc_data *data)
622 {
623         unsigned int blksz = data->blksz;
624         u32 blksz_depth, fifo_depth;
625         u16 thld_size;
626 
627         WARN_ON(!(data->flags & MMC_DATA_READ));
628 
629         if (host->timing != MMC_TIMING_MMC_HS200 &&
630             host->timing != MMC_TIMING_UHS_SDR104)
631                 goto disable;
632 
633         blksz_depth = blksz / (1 << host->data_shift);
634         fifo_depth = host->fifo_depth;
635 
636         if (blksz_depth > fifo_depth)
637                 goto disable;
638 
639         /*
640          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
641          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
642          * Currently just choose blksz.
643          */
644         thld_size = blksz;
645         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(thld_size, 1));
646         return;
647 
648 disable:
649         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(0, 0));
650 }
651 
652 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
653 {
654         int sg_len;
655         u32 temp;
656 
657         host->using_dma = 0;
658 
659         /* If we don't have a channel, we can't do DMA */
660         if (!host->use_dma)
661                 return -ENODEV;
662 
663         sg_len = dw_mci_pre_dma_transfer(host, data, 0);
664         if (sg_len < 0) {
665                 host->dma_ops->stop(host);
666                 return sg_len;
667         }
668 
669         host->using_dma = 1;
670 
671         dev_vdbg(host->dev,
672                  "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
673                  (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
674                  sg_len);
675 
676         /*
677          * Decide the MSIZE and RX/TX Watermark.
678          * If current block size is same with previous size,
679          * no need to update fifoth.
680          */
681         if (host->prev_blksz != data->blksz)
682                 dw_mci_adjust_fifoth(host, data);
683 
684         /* Enable the DMA interface */
685         temp = mci_readl(host, CTRL);
686         temp |= SDMMC_CTRL_DMA_ENABLE;
687         mci_writel(host, CTRL, temp);
688 
689         /* Disable RX/TX IRQs, let DMA handle it */
690         temp = mci_readl(host, INTMASK);
691         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
692         mci_writel(host, INTMASK, temp);
693 
694         host->dma_ops->start(host, sg_len);
695 
696         return 0;
697 }
698 
699 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
700 {
701         u32 temp;
702 
703         data->error = -EINPROGRESS;
704 
705         WARN_ON(host->data);
706         host->sg = NULL;
707         host->data = data;
708 
709         if (data->flags & MMC_DATA_READ) {
710                 host->dir_status = DW_MCI_RECV_STATUS;
711                 dw_mci_ctrl_rd_thld(host, data);
712         } else {
713                 host->dir_status = DW_MCI_SEND_STATUS;
714         }
715 
716         if (dw_mci_submit_data_dma(host, data)) {
717                 int flags = SG_MITER_ATOMIC;
718                 if (host->data->flags & MMC_DATA_READ)
719                         flags |= SG_MITER_TO_SG;
720                 else
721                         flags |= SG_MITER_FROM_SG;
722 
723                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
724                 host->sg = data->sg;
725                 host->part_buf_start = 0;
726                 host->part_buf_count = 0;
727 
728                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
729                 temp = mci_readl(host, INTMASK);
730                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
731                 mci_writel(host, INTMASK, temp);
732 
733                 temp = mci_readl(host, CTRL);
734                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
735                 mci_writel(host, CTRL, temp);
736 
737                 /*
738                  * Use the initial fifoth_val for PIO mode.
739                  * If next issued data may be transfered by DMA mode,
740                  * prev_blksz should be invalidated.
741                  */
742                 mci_writel(host, FIFOTH, host->fifoth_val);
743                 host->prev_blksz = 0;
744         } else {
745                 /*
746                  * Keep the current block size.
747                  * It will be used to decide whether to update
748                  * fifoth register next time.
749                  */
750                 host->prev_blksz = data->blksz;
751         }
752 }
753 
754 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
755 {
756         struct dw_mci *host = slot->host;
757         unsigned long timeout = jiffies + msecs_to_jiffies(500);
758         unsigned int cmd_status = 0;
759 
760         mci_writel(host, CMDARG, arg);
761         wmb();
762         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
763 
764         while (time_before(jiffies, timeout)) {
765                 cmd_status = mci_readl(host, CMD);
766                 if (!(cmd_status & SDMMC_CMD_START))
767                         return;
768         }
769         dev_err(&slot->mmc->class_dev,
770                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
771                 cmd, arg, cmd_status);
772 }
773 
774 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
775 {
776         struct dw_mci *host = slot->host;
777         unsigned int clock = slot->clock;
778         u32 div;
779         u32 clk_en_a;
780         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
781 
782         /* We must continue to set bit 28 in CMD until the change is complete */
783         if (host->state == STATE_WAITING_CMD11_DONE)
784                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
785 
786         if (!clock) {
787                 mci_writel(host, CLKENA, 0);
788                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
789         } else if (clock != host->current_speed || force_clkinit) {
790                 div = host->bus_hz / clock;
791                 if (host->bus_hz % clock && host->bus_hz > clock)
792                         /*
793                          * move the + 1 after the divide to prevent
794                          * over-clocking the card.
795                          */
796                         div += 1;
797 
798                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
799 
800                 if ((clock << div) != slot->__clk_old || force_clkinit)
801                         dev_info(&slot->mmc->class_dev,
802                                  "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
803                                  slot->id, host->bus_hz, clock,
804                                  div ? ((host->bus_hz / div) >> 1) :
805                                  host->bus_hz, div);
806 
807                 /* disable clock */
808                 mci_writel(host, CLKENA, 0);
809                 mci_writel(host, CLKSRC, 0);
810 
811                 /* inform CIU */
812                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
813 
814                 /* set clock to desired speed */
815                 mci_writel(host, CLKDIV, div);
816 
817                 /* inform CIU */
818                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
819 
820                 /* enable clock; only low power if no SDIO */
821                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
822                 if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
823                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
824                 mci_writel(host, CLKENA, clk_en_a);
825 
826                 /* inform CIU */
827                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
828 
829                 /* keep the clock with reflecting clock dividor */
830                 slot->__clk_old = clock << div;
831         }
832 
833         host->current_speed = clock;
834 
835         /* Set the current slot bus width */
836         mci_writel(host, CTYPE, (slot->ctype << slot->id));
837 }
838 
839 static void __dw_mci_start_request(struct dw_mci *host,
840                                    struct dw_mci_slot *slot,
841                                    struct mmc_command *cmd)
842 {
843         struct mmc_request *mrq;
844         struct mmc_data *data;
845         u32 cmdflags;
846 
847         mrq = slot->mrq;
848 
849         host->cur_slot = slot;
850         host->mrq = mrq;
851 
852         host->pending_events = 0;
853         host->completed_events = 0;
854         host->cmd_status = 0;
855         host->data_status = 0;
856         host->dir_status = 0;
857 
858         data = cmd->data;
859         if (data) {
860                 mci_writel(host, TMOUT, 0xFFFFFFFF);
861                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
862                 mci_writel(host, BLKSIZ, data->blksz);
863         }
864 
865         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
866 
867         /* this is the first command, send the initialization clock */
868         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
869                 cmdflags |= SDMMC_CMD_INIT;
870 
871         if (data) {
872                 dw_mci_submit_data(host, data);
873                 wmb();
874         }
875 
876         dw_mci_start_command(host, cmd, cmdflags);
877 
878         if (mrq->stop)
879                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
880         else
881                 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
882 }
883 
884 static void dw_mci_start_request(struct dw_mci *host,
885                                  struct dw_mci_slot *slot)
886 {
887         struct mmc_request *mrq = slot->mrq;
888         struct mmc_command *cmd;
889 
890         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
891         __dw_mci_start_request(host, slot, cmd);
892 }
893 
894 /* must be called with host->lock held */
895 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
896                                  struct mmc_request *mrq)
897 {
898         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
899                  host->state);
900 
901         slot->mrq = mrq;
902 
903         if (host->state == STATE_WAITING_CMD11_DONE) {
904                 dev_warn(&slot->mmc->class_dev,
905                          "Voltage change didn't complete\n");
906                 /*
907                  * this case isn't expected to happen, so we can
908                  * either crash here or just try to continue on
909                  * in the closest possible state
910                  */
911                 host->state = STATE_IDLE;
912         }
913 
914         if (host->state == STATE_IDLE) {
915                 host->state = STATE_SENDING_CMD;
916                 dw_mci_start_request(host, slot);
917         } else {
918                 list_add_tail(&slot->queue_node, &host->queue);
919         }
920 }
921 
922 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
923 {
924         struct dw_mci_slot *slot = mmc_priv(mmc);
925         struct dw_mci *host = slot->host;
926 
927         WARN_ON(slot->mrq);
928 
929         /*
930          * The check for card presence and queueing of the request must be
931          * atomic, otherwise the card could be removed in between and the
932          * request wouldn't fail until another card was inserted.
933          */
934         spin_lock_bh(&host->lock);
935 
936         if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
937                 spin_unlock_bh(&host->lock);
938                 mrq->cmd->error = -ENOMEDIUM;
939                 mmc_request_done(mmc, mrq);
940                 return;
941         }
942 
943         dw_mci_queue_request(host, slot, mrq);
944 
945         spin_unlock_bh(&host->lock);
946 }
947 
948 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
949 {
950         struct dw_mci_slot *slot = mmc_priv(mmc);
951         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
952         u32 regs;
953         int ret;
954 
955         switch (ios->bus_width) {
956         case MMC_BUS_WIDTH_4:
957                 slot->ctype = SDMMC_CTYPE_4BIT;
958                 break;
959         case MMC_BUS_WIDTH_8:
960                 slot->ctype = SDMMC_CTYPE_8BIT;
961                 break;
962         default:
963                 /* set default 1 bit mode */
964                 slot->ctype = SDMMC_CTYPE_1BIT;
965         }
966 
967         regs = mci_readl(slot->host, UHS_REG);
968 
969         /* DDR mode set */
970         if (ios->timing == MMC_TIMING_MMC_DDR52)
971                 regs |= ((0x1 << slot->id) << 16);
972         else
973                 regs &= ~((0x1 << slot->id) << 16);
974 
975         mci_writel(slot->host, UHS_REG, regs);
976         slot->host->timing = ios->timing;
977 
978         /*
979          * Use mirror of ios->clock to prevent race with mmc
980          * core ios update when finding the minimum.
981          */
982         slot->clock = ios->clock;
983 
984         if (drv_data && drv_data->set_ios)
985                 drv_data->set_ios(slot->host, ios);
986 
987         /* Slot specific timing and width adjustment */
988         dw_mci_setup_bus(slot, false);
989 
990         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
991                 slot->host->state = STATE_IDLE;
992 
993         switch (ios->power_mode) {
994         case MMC_POWER_UP:
995                 if (!IS_ERR(mmc->supply.vmmc)) {
996                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
997                                         ios->vdd);
998                         if (ret) {
999                                 dev_err(slot->host->dev,
1000                                         "failed to enable vmmc regulator\n");
1001                                 /*return, if failed turn on vmmc*/
1002                                 return;
1003                         }
1004                 }
1005                 if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) {
1006                         ret = regulator_enable(mmc->supply.vqmmc);
1007                         if (ret < 0)
1008                                 dev_err(slot->host->dev,
1009                                         "failed to enable vqmmc regulator\n");
1010                         else
1011                                 slot->host->vqmmc_enabled = true;
1012                 }
1013                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1014                 regs = mci_readl(slot->host, PWREN);
1015                 regs |= (1 << slot->id);
1016                 mci_writel(slot->host, PWREN, regs);
1017                 break;
1018         case MMC_POWER_OFF:
1019                 if (!IS_ERR(mmc->supply.vmmc))
1020                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1021 
1022                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) {
1023                         regulator_disable(mmc->supply.vqmmc);
1024                         slot->host->vqmmc_enabled = false;
1025                 }
1026 
1027                 regs = mci_readl(slot->host, PWREN);
1028                 regs &= ~(1 << slot->id);
1029                 mci_writel(slot->host, PWREN, regs);
1030                 break;
1031         default:
1032                 break;
1033         }
1034 }
1035 
1036 static int dw_mci_card_busy(struct mmc_host *mmc)
1037 {
1038         struct dw_mci_slot *slot = mmc_priv(mmc);
1039         u32 status;
1040 
1041         /*
1042          * Check the busy bit which is low when DAT[3:0]
1043          * (the data lines) are 0000
1044          */
1045         status = mci_readl(slot->host, STATUS);
1046 
1047         return !!(status & SDMMC_STATUS_BUSY);
1048 }
1049 
1050 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1051 {
1052         struct dw_mci_slot *slot = mmc_priv(mmc);
1053         struct dw_mci *host = slot->host;
1054         u32 uhs;
1055         u32 v18 = SDMMC_UHS_18V << slot->id;
1056         int min_uv, max_uv;
1057         int ret;
1058 
1059         /*
1060          * Program the voltage.  Note that some instances of dw_mmc may use
1061          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1062          * does no harm but you need to set the regulator directly.  Try both.
1063          */
1064         uhs = mci_readl(host, UHS_REG);
1065         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1066                 min_uv = 2700000;
1067                 max_uv = 3600000;
1068                 uhs &= ~v18;
1069         } else {
1070                 min_uv = 1700000;
1071                 max_uv = 1950000;
1072                 uhs |= v18;
1073         }
1074         if (!IS_ERR(mmc->supply.vqmmc)) {
1075                 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
1076 
1077                 if (ret) {
1078                         dev_err(&mmc->class_dev,
1079                                          "Regulator set error %d: %d - %d\n",
1080                                          ret, min_uv, max_uv);
1081                         return ret;
1082                 }
1083         }
1084         mci_writel(host, UHS_REG, uhs);
1085 
1086         return 0;
1087 }
1088 
1089 static int dw_mci_get_ro(struct mmc_host *mmc)
1090 {
1091         int read_only;
1092         struct dw_mci_slot *slot = mmc_priv(mmc);
1093         int gpio_ro = mmc_gpio_get_ro(mmc);
1094 
1095         /* Use platform get_ro function, else try on board write protect */
1096         if ((slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT) ||
1097                         (slot->host->quirks & DW_MCI_QUIRK_NO_WRITE_PROTECT))
1098                 read_only = 0;
1099         else if (!IS_ERR_VALUE(gpio_ro))
1100                 read_only = gpio_ro;
1101         else
1102                 read_only =
1103                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1104 
1105         dev_dbg(&mmc->class_dev, "card is %s\n",
1106                 read_only ? "read-only" : "read-write");
1107 
1108         return read_only;
1109 }
1110 
1111 static int dw_mci_get_cd(struct mmc_host *mmc)
1112 {
1113         int present;
1114         struct dw_mci_slot *slot = mmc_priv(mmc);
1115         struct dw_mci_board *brd = slot->host->pdata;
1116         struct dw_mci *host = slot->host;
1117         int gpio_cd = mmc_gpio_get_cd(mmc);
1118 
1119         /* Use platform get_cd function, else try onboard card detect */
1120         if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
1121                 present = 1;
1122         else if (!IS_ERR_VALUE(gpio_cd))
1123                 present = gpio_cd;
1124         else
1125                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1126                         == 0 ? 1 : 0;
1127 
1128         spin_lock_bh(&host->lock);
1129         if (present) {
1130                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1131                 dev_dbg(&mmc->class_dev, "card is present\n");
1132         } else {
1133                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1134                 dev_dbg(&mmc->class_dev, "card is not present\n");
1135         }
1136         spin_unlock_bh(&host->lock);
1137 
1138         return present;
1139 }
1140 
1141 /*
1142  * Disable lower power mode.
1143  *
1144  * Low power mode will stop the card clock when idle.  According to the
1145  * description of the CLKENA register we should disable low power mode
1146  * for SDIO cards if we need SDIO interrupts to work.
1147  *
1148  * This function is fast if low power mode is already disabled.
1149  */
1150 static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
1151 {
1152         struct dw_mci *host = slot->host;
1153         u32 clk_en_a;
1154         const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1155 
1156         clk_en_a = mci_readl(host, CLKENA);
1157 
1158         if (clk_en_a & clken_low_pwr) {
1159                 mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
1160                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1161                              SDMMC_CMD_PRV_DAT_WAIT, 0);
1162         }
1163 }
1164 
1165 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1166 {
1167         struct dw_mci_slot *slot = mmc_priv(mmc);
1168         struct dw_mci *host = slot->host;
1169         u32 int_mask;
1170 
1171         /* Enable/disable Slot Specific SDIO interrupt */
1172         int_mask = mci_readl(host, INTMASK);
1173         if (enb) {
1174                 /*
1175                  * Turn off low power mode if it was enabled.  This is a bit of
1176                  * a heavy operation and we disable / enable IRQs a lot, so
1177                  * we'll leave low power mode disabled and it will get
1178                  * re-enabled again in dw_mci_setup_bus().
1179                  */
1180                 dw_mci_disable_low_power(slot);
1181 
1182                 mci_writel(host, INTMASK,
1183                            (int_mask | SDMMC_INT_SDIO(slot->id)));
1184         } else {
1185                 mci_writel(host, INTMASK,
1186                            (int_mask & ~SDMMC_INT_SDIO(slot->id)));
1187         }
1188 }
1189 
1190 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1191 {
1192         struct dw_mci_slot *slot = mmc_priv(mmc);
1193         struct dw_mci *host = slot->host;
1194         const struct dw_mci_drv_data *drv_data = host->drv_data;
1195         struct dw_mci_tuning_data tuning_data;
1196         int err = -ENOSYS;
1197 
1198         if (opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1199                 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
1200                         tuning_data.blk_pattern = tuning_blk_pattern_8bit;
1201                         tuning_data.blksz = sizeof(tuning_blk_pattern_8bit);
1202                 } else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
1203                         tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1204                         tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1205                 } else {
1206                         return -EINVAL;
1207                 }
1208         } else if (opcode == MMC_SEND_TUNING_BLOCK) {
1209                 tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1210                 tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1211         } else {
1212                 dev_err(host->dev,
1213                         "Undefined command(%d) for tuning\n", opcode);
1214                 return -EINVAL;
1215         }
1216 
1217         if (drv_data && drv_data->execute_tuning)
1218                 err = drv_data->execute_tuning(slot, opcode, &tuning_data);
1219         return err;
1220 }
1221 
1222 static const struct mmc_host_ops dw_mci_ops = {
1223         .request                = dw_mci_request,
1224         .pre_req                = dw_mci_pre_req,
1225         .post_req               = dw_mci_post_req,
1226         .set_ios                = dw_mci_set_ios,
1227         .get_ro                 = dw_mci_get_ro,
1228         .get_cd                 = dw_mci_get_cd,
1229         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1230         .execute_tuning         = dw_mci_execute_tuning,
1231         .card_busy              = dw_mci_card_busy,
1232         .start_signal_voltage_switch = dw_mci_switch_voltage,
1233 
1234 };
1235 
1236 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1237         __releases(&host->lock)
1238         __acquires(&host->lock)
1239 {
1240         struct dw_mci_slot *slot;
1241         struct mmc_host *prev_mmc = host->cur_slot->mmc;
1242 
1243         WARN_ON(host->cmd || host->data);
1244 
1245         host->cur_slot->mrq = NULL;
1246         host->mrq = NULL;
1247         if (!list_empty(&host->queue)) {
1248                 slot = list_entry(host->queue.next,
1249                                   struct dw_mci_slot, queue_node);
1250                 list_del(&slot->queue_node);
1251                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1252                          mmc_hostname(slot->mmc));
1253                 host->state = STATE_SENDING_CMD;
1254                 dw_mci_start_request(host, slot);
1255         } else {
1256                 dev_vdbg(host->dev, "list empty\n");
1257 
1258                 if (host->state == STATE_SENDING_CMD11)
1259                         host->state = STATE_WAITING_CMD11_DONE;
1260                 else
1261                         host->state = STATE_IDLE;
1262         }
1263 
1264         spin_unlock(&host->lock);
1265         mmc_request_done(prev_mmc, mrq);
1266         spin_lock(&host->lock);
1267 }
1268 
1269 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1270 {
1271         u32 status = host->cmd_status;
1272 
1273         host->cmd_status = 0;
1274 
1275         /* Read the response from the card (up to 16 bytes) */
1276         if (cmd->flags & MMC_RSP_PRESENT) {
1277                 if (cmd->flags & MMC_RSP_136) {
1278                         cmd->resp[3] = mci_readl(host, RESP0);
1279                         cmd->resp[2] = mci_readl(host, RESP1);
1280                         cmd->resp[1] = mci_readl(host, RESP2);
1281                         cmd->resp[0] = mci_readl(host, RESP3);
1282                 } else {
1283                         cmd->resp[0] = mci_readl(host, RESP0);
1284                         cmd->resp[1] = 0;
1285                         cmd->resp[2] = 0;
1286                         cmd->resp[3] = 0;
1287                 }
1288         }
1289 
1290         if (status & SDMMC_INT_RTO)
1291                 cmd->error = -ETIMEDOUT;
1292         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1293                 cmd->error = -EILSEQ;
1294         else if (status & SDMMC_INT_RESP_ERR)
1295                 cmd->error = -EIO;
1296         else
1297                 cmd->error = 0;
1298 
1299         if (cmd->error) {
1300                 /* newer ip versions need a delay between retries */
1301                 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1302                         mdelay(20);
1303         }
1304 
1305         return cmd->error;
1306 }
1307 
1308 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1309 {
1310         u32 status = host->data_status;
1311 
1312         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1313                 if (status & SDMMC_INT_DRTO) {
1314                         data->error = -ETIMEDOUT;
1315                 } else if (status & SDMMC_INT_DCRC) {
1316                         data->error = -EILSEQ;
1317                 } else if (status & SDMMC_INT_EBE) {
1318                         if (host->dir_status ==
1319                                 DW_MCI_SEND_STATUS) {
1320                                 /*
1321                                  * No data CRC status was returned.
1322                                  * The number of bytes transferred
1323                                  * will be exaggerated in PIO mode.
1324                                  */
1325                                 data->bytes_xfered = 0;
1326                                 data->error = -ETIMEDOUT;
1327                         } else if (host->dir_status ==
1328                                         DW_MCI_RECV_STATUS) {
1329                                 data->error = -EIO;
1330                         }
1331                 } else {
1332                         /* SDMMC_INT_SBE is included */
1333                         data->error = -EIO;
1334                 }
1335 
1336                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1337 
1338                 /*
1339                  * After an error, there may be data lingering
1340                  * in the FIFO
1341                  */
1342                 dw_mci_reset(host);
1343         } else {
1344                 data->bytes_xfered = data->blocks * data->blksz;
1345                 data->error = 0;
1346         }
1347 
1348         return data->error;
1349 }
1350 
1351 static void dw_mci_tasklet_func(unsigned long priv)
1352 {
1353         struct dw_mci *host = (struct dw_mci *)priv;
1354         struct mmc_data *data;
1355         struct mmc_command *cmd;
1356         struct mmc_request *mrq;
1357         enum dw_mci_state state;
1358         enum dw_mci_state prev_state;
1359         unsigned int err;
1360 
1361         spin_lock(&host->lock);
1362 
1363         state = host->state;
1364         data = host->data;
1365         mrq = host->mrq;
1366 
1367         do {
1368                 prev_state = state;
1369 
1370                 switch (state) {
1371                 case STATE_IDLE:
1372                 case STATE_WAITING_CMD11_DONE:
1373                         break;
1374 
1375                 case STATE_SENDING_CMD11:
1376                 case STATE_SENDING_CMD:
1377                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1378                                                 &host->pending_events))
1379                                 break;
1380 
1381                         cmd = host->cmd;
1382                         host->cmd = NULL;
1383                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1384                         err = dw_mci_command_complete(host, cmd);
1385                         if (cmd == mrq->sbc && !err) {
1386                                 prev_state = state = STATE_SENDING_CMD;
1387                                 __dw_mci_start_request(host, host->cur_slot,
1388                                                        mrq->cmd);
1389                                 goto unlock;
1390                         }
1391 
1392                         if (cmd->data && err) {
1393                                 dw_mci_stop_dma(host);
1394                                 send_stop_abort(host, data);
1395                                 state = STATE_SENDING_STOP;
1396                                 break;
1397                         }
1398 
1399                         if (!cmd->data || err) {
1400                                 dw_mci_request_end(host, mrq);
1401                                 goto unlock;
1402                         }
1403 
1404                         prev_state = state = STATE_SENDING_DATA;
1405                         /* fall through */
1406 
1407                 case STATE_SENDING_DATA:
1408                         /*
1409                          * We could get a data error and never a transfer
1410                          * complete so we'd better check for it here.
1411                          *
1412                          * Note that we don't really care if we also got a
1413                          * transfer complete; stopping the DMA and sending an
1414                          * abort won't hurt.
1415                          */
1416                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1417                                                &host->pending_events)) {
1418                                 dw_mci_stop_dma(host);
1419                                 send_stop_abort(host, data);
1420                                 state = STATE_DATA_ERROR;
1421                                 break;
1422                         }
1423 
1424                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1425                                                 &host->pending_events))
1426                                 break;
1427 
1428                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1429 
1430                         /*
1431                          * Handle an EVENT_DATA_ERROR that might have shown up
1432                          * before the transfer completed.  This might not have
1433                          * been caught by the check above because the interrupt
1434                          * could have gone off between the previous check and
1435                          * the check for transfer complete.
1436                          *
1437                          * Technically this ought not be needed assuming we
1438                          * get a DATA_COMPLETE eventually (we'll notice the
1439                          * error and end the request), but it shouldn't hurt.
1440                          *
1441                          * This has the advantage of sending the stop command.
1442                          */
1443                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1444                                                &host->pending_events)) {
1445                                 dw_mci_stop_dma(host);
1446                                 send_stop_abort(host, data);
1447                                 state = STATE_DATA_ERROR;
1448                                 break;
1449                         }
1450                         prev_state = state = STATE_DATA_BUSY;
1451 
1452                         /* fall through */
1453 
1454                 case STATE_DATA_BUSY:
1455                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1456                                                 &host->pending_events))
1457                                 break;
1458 
1459                         host->data = NULL;
1460                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1461                         err = dw_mci_data_complete(host, data);
1462 
1463                         if (!err) {
1464                                 if (!data->stop || mrq->sbc) {
1465                                         if (mrq->sbc && data->stop)
1466                                                 data->stop->error = 0;
1467                                         dw_mci_request_end(host, mrq);
1468                                         goto unlock;
1469                                 }
1470 
1471                                 /* stop command for open-ended transfer*/
1472                                 if (data->stop)
1473                                         send_stop_abort(host, data);
1474                         } else {
1475                                 /*
1476                                  * If we don't have a command complete now we'll
1477                                  * never get one since we just reset everything;
1478                                  * better end the request.
1479                                  *
1480                                  * If we do have a command complete we'll fall
1481                                  * through to the SENDING_STOP command and
1482                                  * everything will be peachy keen.
1483                                  */
1484                                 if (!test_bit(EVENT_CMD_COMPLETE,
1485                                               &host->pending_events)) {
1486                                         host->cmd = NULL;
1487                                         dw_mci_request_end(host, mrq);
1488                                         goto unlock;
1489                                 }
1490                         }
1491 
1492                         /*
1493                          * If err has non-zero,
1494                          * stop-abort command has been already issued.
1495                          */
1496                         prev_state = state = STATE_SENDING_STOP;
1497 
1498                         /* fall through */
1499 
1500                 case STATE_SENDING_STOP:
1501                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1502                                                 &host->pending_events))
1503                                 break;
1504 
1505                         /* CMD error in data command */
1506                         if (mrq->cmd->error && mrq->data)
1507                                 dw_mci_reset(host);
1508 
1509                         host->cmd = NULL;
1510                         host->data = NULL;
1511 
1512                         if (mrq->stop)
1513                                 dw_mci_command_complete(host, mrq->stop);
1514                         else
1515                                 host->cmd_status = 0;
1516 
1517                         dw_mci_request_end(host, mrq);
1518                         goto unlock;
1519 
1520                 case STATE_DATA_ERROR:
1521                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1522                                                 &host->pending_events))
1523                                 break;
1524 
1525                         state = STATE_DATA_BUSY;
1526                         break;
1527                 }
1528         } while (state != prev_state);
1529 
1530         host->state = state;
1531 unlock:
1532         spin_unlock(&host->lock);
1533 
1534 }
1535 
1536 /* push final bytes to part_buf, only use during push */
1537 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1538 {
1539         memcpy((void *)&host->part_buf, buf, cnt);
1540         host->part_buf_count = cnt;
1541 }
1542 
1543 /* append bytes to part_buf, only use during push */
1544 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1545 {
1546         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1547         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1548         host->part_buf_count += cnt;
1549         return cnt;
1550 }
1551 
1552 /* pull first bytes from part_buf, only use during pull */
1553 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1554 {
1555         cnt = min(cnt, (int)host->part_buf_count);
1556         if (cnt) {
1557                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1558                        cnt);
1559                 host->part_buf_count -= cnt;
1560                 host->part_buf_start += cnt;
1561         }
1562         return cnt;
1563 }
1564 
1565 /* pull final bytes from the part_buf, assuming it's just been filled */
1566 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1567 {
1568         memcpy(buf, &host->part_buf, cnt);
1569         host->part_buf_start = cnt;
1570         host->part_buf_count = (1 << host->data_shift) - cnt;
1571 }
1572 
1573 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1574 {
1575         struct mmc_data *data = host->data;
1576         int init_cnt = cnt;
1577 
1578         /* try and push anything in the part_buf */
1579         if (unlikely(host->part_buf_count)) {
1580                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1581                 buf += len;
1582                 cnt -= len;
1583                 if (host->part_buf_count == 2) {
1584                         mci_writew(host, DATA(host->data_offset),
1585                                         host->part_buf16);
1586                         host->part_buf_count = 0;
1587                 }
1588         }
1589 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1590         if (unlikely((unsigned long)buf & 0x1)) {
1591                 while (cnt >= 2) {
1592                         u16 aligned_buf[64];
1593                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1594                         int items = len >> 1;
1595                         int i;
1596                         /* memcpy from input buffer into aligned buffer */
1597                         memcpy(aligned_buf, buf, len);
1598                         buf += len;
1599                         cnt -= len;
1600                         /* push data from aligned buffer into fifo */
1601                         for (i = 0; i < items; ++i)
1602                                 mci_writew(host, DATA(host->data_offset),
1603                                                 aligned_buf[i]);
1604                 }
1605         } else
1606 #endif
1607         {
1608                 u16 *pdata = buf;
1609                 for (; cnt >= 2; cnt -= 2)
1610                         mci_writew(host, DATA(host->data_offset), *pdata++);
1611                 buf = pdata;
1612         }
1613         /* put anything remaining in the part_buf */
1614         if (cnt) {
1615                 dw_mci_set_part_bytes(host, buf, cnt);
1616                  /* Push data if we have reached the expected data length */
1617                 if ((data->bytes_xfered + init_cnt) ==
1618                     (data->blksz * data->blocks))
1619                         mci_writew(host, DATA(host->data_offset),
1620                                    host->part_buf16);
1621         }
1622 }
1623 
1624 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1625 {
1626 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1627         if (unlikely((unsigned long)buf & 0x1)) {
1628                 while (cnt >= 2) {
1629                         /* pull data from fifo into aligned buffer */
1630                         u16 aligned_buf[64];
1631                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1632                         int items = len >> 1;
1633                         int i;
1634                         for (i = 0; i < items; ++i)
1635                                 aligned_buf[i] = mci_readw(host,
1636                                                 DATA(host->data_offset));
1637                         /* memcpy from aligned buffer into output buffer */
1638                         memcpy(buf, aligned_buf, len);
1639                         buf += len;
1640                         cnt -= len;
1641                 }
1642         } else
1643 #endif
1644         {
1645                 u16 *pdata = buf;
1646                 for (; cnt >= 2; cnt -= 2)
1647                         *pdata++ = mci_readw(host, DATA(host->data_offset));
1648                 buf = pdata;
1649         }
1650         if (cnt) {
1651                 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1652                 dw_mci_pull_final_bytes(host, buf, cnt);
1653         }
1654 }
1655 
1656 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1657 {
1658         struct mmc_data *data = host->data;
1659         int init_cnt = cnt;
1660 
1661         /* try and push anything in the part_buf */
1662         if (unlikely(host->part_buf_count)) {
1663                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1664                 buf += len;
1665                 cnt -= len;
1666                 if (host->part_buf_count == 4) {
1667                         mci_writel(host, DATA(host->data_offset),
1668                                         host->part_buf32);
1669                         host->part_buf_count = 0;
1670                 }
1671         }
1672 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1673         if (unlikely((unsigned long)buf & 0x3)) {
1674                 while (cnt >= 4) {
1675                         u32 aligned_buf[32];
1676                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1677                         int items = len >> 2;
1678                         int i;
1679                         /* memcpy from input buffer into aligned buffer */
1680                         memcpy(aligned_buf, buf, len);
1681                         buf += len;
1682                         cnt -= len;
1683                         /* push data from aligned buffer into fifo */
1684                         for (i = 0; i < items; ++i)
1685                                 mci_writel(host, DATA(host->data_offset),
1686                                                 aligned_buf[i]);
1687                 }
1688         } else
1689 #endif
1690         {
1691                 u32 *pdata = buf;
1692                 for (; cnt >= 4; cnt -= 4)
1693                         mci_writel(host, DATA(host->data_offset), *pdata++);
1694                 buf = pdata;
1695         }
1696         /* put anything remaining in the part_buf */
1697         if (cnt) {
1698                 dw_mci_set_part_bytes(host, buf, cnt);
1699                  /* Push data if we have reached the expected data length */
1700                 if ((data->bytes_xfered + init_cnt) ==
1701                     (data->blksz * data->blocks))
1702                         mci_writel(host, DATA(host->data_offset),
1703                                    host->part_buf32);
1704         }
1705 }
1706 
1707 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1708 {
1709 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1710         if (unlikely((unsigned long)buf & 0x3)) {
1711                 while (cnt >= 4) {
1712                         /* pull data from fifo into aligned buffer */
1713                         u32 aligned_buf[32];
1714                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1715                         int items = len >> 2;
1716                         int i;
1717                         for (i = 0; i < items; ++i)
1718                                 aligned_buf[i] = mci_readl(host,
1719                                                 DATA(host->data_offset));
1720                         /* memcpy from aligned buffer into output buffer */
1721                         memcpy(buf, aligned_buf, len);
1722                         buf += len;
1723                         cnt -= len;
1724                 }
1725         } else
1726 #endif
1727         {
1728                 u32 *pdata = buf;
1729                 for (; cnt >= 4; cnt -= 4)
1730                         *pdata++ = mci_readl(host, DATA(host->data_offset));
1731                 buf = pdata;
1732         }
1733         if (cnt) {
1734                 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1735                 dw_mci_pull_final_bytes(host, buf, cnt);
1736         }
1737 }
1738 
1739 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1740 {
1741         struct mmc_data *data = host->data;
1742         int init_cnt = cnt;
1743 
1744         /* try and push anything in the part_buf */
1745         if (unlikely(host->part_buf_count)) {
1746                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1747                 buf += len;
1748                 cnt -= len;
1749 
1750                 if (host->part_buf_count == 8) {
1751                         mci_writeq(host, DATA(host->data_offset),
1752                                         host->part_buf);
1753                         host->part_buf_count = 0;
1754                 }
1755         }
1756 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1757         if (unlikely((unsigned long)buf & 0x7)) {
1758                 while (cnt >= 8) {
1759                         u64 aligned_buf[16];
1760                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1761                         int items = len >> 3;
1762                         int i;
1763                         /* memcpy from input buffer into aligned buffer */
1764                         memcpy(aligned_buf, buf, len);
1765                         buf += len;
1766                         cnt -= len;
1767                         /* push data from aligned buffer into fifo */
1768                         for (i = 0; i < items; ++i)
1769                                 mci_writeq(host, DATA(host->data_offset),
1770                                                 aligned_buf[i]);
1771                 }
1772         } else
1773 #endif
1774         {
1775                 u64 *pdata = buf;
1776                 for (; cnt >= 8; cnt -= 8)
1777                         mci_writeq(host, DATA(host->data_offset), *pdata++);
1778                 buf = pdata;
1779         }
1780         /* put anything remaining in the part_buf */
1781         if (cnt) {
1782                 dw_mci_set_part_bytes(host, buf, cnt);
1783                 /* Push data if we have reached the expected data length */
1784                 if ((data->bytes_xfered + init_cnt) ==
1785                     (data->blksz * data->blocks))
1786                         mci_writeq(host, DATA(host->data_offset),
1787                                    host->part_buf);
1788         }
1789 }
1790 
1791 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1792 {
1793 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1794         if (unlikely((unsigned long)buf & 0x7)) {
1795                 while (cnt >= 8) {
1796                         /* pull data from fifo into aligned buffer */
1797                         u64 aligned_buf[16];
1798                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1799                         int items = len >> 3;
1800                         int i;
1801                         for (i = 0; i < items; ++i)
1802                                 aligned_buf[i] = mci_readq(host,
1803                                                 DATA(host->data_offset));
1804                         /* memcpy from aligned buffer into output buffer */
1805                         memcpy(buf, aligned_buf, len);
1806                         buf += len;
1807                         cnt -= len;
1808                 }
1809         } else
1810 #endif
1811         {
1812                 u64 *pdata = buf;
1813                 for (; cnt >= 8; cnt -= 8)
1814                         *pdata++ = mci_readq(host, DATA(host->data_offset));
1815                 buf = pdata;
1816         }
1817         if (cnt) {
1818                 host->part_buf = mci_readq(host, DATA(host->data_offset));
1819                 dw_mci_pull_final_bytes(host, buf, cnt);
1820         }
1821 }
1822 
1823 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1824 {
1825         int len;
1826 
1827         /* get remaining partial bytes */
1828         len = dw_mci_pull_part_bytes(host, buf, cnt);
1829         if (unlikely(len == cnt))
1830                 return;
1831         buf += len;
1832         cnt -= len;
1833 
1834         /* get the rest of the data */
1835         host->pull_data(host, buf, cnt);
1836 }
1837 
1838 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
1839 {
1840         struct sg_mapping_iter *sg_miter = &host->sg_miter;
1841         void *buf;
1842         unsigned int offset;
1843         struct mmc_data *data = host->data;
1844         int shift = host->data_shift;
1845         u32 status;
1846         unsigned int len;
1847         unsigned int remain, fcnt;
1848 
1849         do {
1850                 if (!sg_miter_next(sg_miter))
1851                         goto done;
1852 
1853                 host->sg = sg_miter->piter.sg;
1854                 buf = sg_miter->addr;
1855                 remain = sg_miter->length;
1856                 offset = 0;
1857 
1858                 do {
1859                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1860                                         << shift) + host->part_buf_count;
1861                         len = min(remain, fcnt);
1862                         if (!len)
1863                                 break;
1864                         dw_mci_pull_data(host, (void *)(buf + offset), len);
1865                         data->bytes_xfered += len;
1866                         offset += len;
1867                         remain -= len;
1868                 } while (remain);
1869 
1870                 sg_miter->consumed = offset;
1871                 status = mci_readl(host, MINTSTS);
1872                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1873         /* if the RXDR is ready read again */
1874         } while ((status & SDMMC_INT_RXDR) ||
1875                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
1876 
1877         if (!remain) {
1878                 if (!sg_miter_next(sg_miter))
1879                         goto done;
1880                 sg_miter->consumed = 0;
1881         }
1882         sg_miter_stop(sg_miter);
1883         return;
1884 
1885 done:
1886         sg_miter_stop(sg_miter);
1887         host->sg = NULL;
1888         smp_wmb();
1889         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1890 }
1891 
1892 static void dw_mci_write_data_pio(struct dw_mci *host)
1893 {
1894         struct sg_mapping_iter *sg_miter = &host->sg_miter;
1895         void *buf;
1896         unsigned int offset;
1897         struct mmc_data *data = host->data;
1898         int shift = host->data_shift;
1899         u32 status;
1900         unsigned int len;
1901         unsigned int fifo_depth = host->fifo_depth;
1902         unsigned int remain, fcnt;
1903 
1904         do {
1905                 if (!sg_miter_next(sg_miter))
1906                         goto done;
1907 
1908                 host->sg = sg_miter->piter.sg;
1909                 buf = sg_miter->addr;
1910                 remain = sg_miter->length;
1911                 offset = 0;
1912 
1913                 do {
1914                         fcnt = ((fifo_depth -
1915                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1916                                         << shift) - host->part_buf_count;
1917                         len = min(remain, fcnt);
1918                         if (!len)
1919                                 break;
1920                         host->push_data(host, (void *)(buf + offset), len);
1921                         data->bytes_xfered += len;
1922                         offset += len;
1923                         remain -= len;
1924                 } while (remain);
1925 
1926                 sg_miter->consumed = offset;
1927                 status = mci_readl(host, MINTSTS);
1928                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1929         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1930 
1931         if (!remain) {
1932                 if (!sg_miter_next(sg_miter))
1933                         goto done;
1934                 sg_miter->consumed = 0;
1935         }
1936         sg_miter_stop(sg_miter);
1937         return;
1938 
1939 done:
1940         sg_miter_stop(sg_miter);
1941         host->sg = NULL;
1942         smp_wmb();
1943         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1944 }
1945 
1946 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1947 {
1948         if (!host->cmd_status)
1949                 host->cmd_status = status;
1950 
1951         smp_wmb();
1952 
1953         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1954         tasklet_schedule(&host->tasklet);
1955 }
1956 
1957 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1958 {
1959         struct dw_mci *host = dev_id;
1960         u32 pending;
1961         int i;
1962 
1963         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1964 
1965         /*
1966          * DTO fix - version 2.10a and below, and only if internal DMA
1967          * is configured.
1968          */
1969         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1970                 if (!pending &&
1971                     ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1972                         pending |= SDMMC_INT_DATA_OVER;
1973         }
1974 
1975         if (pending) {
1976                 /* Check volt switch first, since it can look like an error */
1977                 if ((host->state == STATE_SENDING_CMD11) &&
1978                     (pending & SDMMC_INT_VOLT_SWITCH)) {
1979                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
1980                         pending &= ~SDMMC_INT_VOLT_SWITCH;
1981                         dw_mci_cmd_interrupt(host, pending);
1982                 }
1983 
1984                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1985                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1986                         host->cmd_status = pending;
1987                         smp_wmb();
1988                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1989                 }
1990 
1991                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1992                         /* if there is an error report DATA_ERROR */
1993                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1994                         host->data_status = pending;
1995                         smp_wmb();
1996                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
1997                         tasklet_schedule(&host->tasklet);
1998                 }
1999 
2000                 if (pending & SDMMC_INT_DATA_OVER) {
2001                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2002                         if (!host->data_status)
2003                                 host->data_status = pending;
2004                         smp_wmb();
2005                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2006                                 if (host->sg != NULL)
2007                                         dw_mci_read_data_pio(host, true);
2008                         }
2009                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2010                         tasklet_schedule(&host->tasklet);
2011                 }
2012 
2013                 if (pending & SDMMC_INT_RXDR) {
2014                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2015                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2016                                 dw_mci_read_data_pio(host, false);
2017                 }
2018 
2019                 if (pending & SDMMC_INT_TXDR) {
2020                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2021                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2022                                 dw_mci_write_data_pio(host);
2023                 }
2024 
2025                 if (pending & SDMMC_INT_CMD_DONE) {
2026                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2027                         dw_mci_cmd_interrupt(host, pending);
2028                 }
2029 
2030                 if (pending & SDMMC_INT_CD) {
2031                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2032                         queue_work(host->card_workqueue, &host->card_work);
2033                 }
2034 
2035                 /* Handle SDIO Interrupts */
2036                 for (i = 0; i < host->num_slots; i++) {
2037                         struct dw_mci_slot *slot = host->slot[i];
2038                         if (pending & SDMMC_INT_SDIO(i)) {
2039                                 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
2040                                 mmc_signal_sdio_irq(slot->mmc);
2041                         }
2042                 }
2043 
2044         }
2045 
2046 #ifdef CONFIG_MMC_DW_IDMAC
2047         /* Handle DMA interrupts */
2048         pending = mci_readl(host, IDSTS);
2049         if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2050                 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
2051                 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2052                 host->dma_ops->complete(host);
2053         }
2054 #endif
2055 
2056         return IRQ_HANDLED;
2057 }
2058 
2059 static void dw_mci_work_routine_card(struct work_struct *work)
2060 {
2061         struct dw_mci *host = container_of(work, struct dw_mci, card_work);
2062         int i;
2063 
2064         for (i = 0; i < host->num_slots; i++) {
2065                 struct dw_mci_slot *slot = host->slot[i];
2066                 struct mmc_host *mmc = slot->mmc;
2067                 struct mmc_request *mrq;
2068                 int present;
2069 
2070                 present = dw_mci_get_cd(mmc);
2071                 while (present != slot->last_detect_state) {
2072                         dev_dbg(&slot->mmc->class_dev, "card %s\n",
2073                                 present ? "inserted" : "removed");
2074 
2075                         spin_lock_bh(&host->lock);
2076 
2077                         /* Card change detected */
2078                         slot->last_detect_state = present;
2079 
2080                         /* Clean up queue if present */
2081                         mrq = slot->mrq;
2082                         if (mrq) {
2083                                 if (mrq == host->mrq) {
2084                                         host->data = NULL;
2085                                         host->cmd = NULL;
2086 
2087                                         switch (host->state) {
2088                                         case STATE_IDLE:
2089                                         case STATE_WAITING_CMD11_DONE:
2090                                                 break;
2091                                         case STATE_SENDING_CMD11:
2092                                         case STATE_SENDING_CMD:
2093                                                 mrq->cmd->error = -ENOMEDIUM;
2094                                                 if (!mrq->data)
2095                                                         break;
2096                                                 /* fall through */
2097                                         case STATE_SENDING_DATA:
2098                                                 mrq->data->error = -ENOMEDIUM;
2099                                                 dw_mci_stop_dma(host);
2100                                                 break;
2101                                         case STATE_DATA_BUSY:
2102                                         case STATE_DATA_ERROR:
2103                                                 if (mrq->data->error == -EINPROGRESS)
2104                                                         mrq->data->error = -ENOMEDIUM;
2105                                                 /* fall through */
2106                                         case STATE_SENDING_STOP:
2107                                                 if (mrq->stop)
2108                                                         mrq->stop->error = -ENOMEDIUM;
2109                                                 break;
2110                                         }
2111 
2112                                         dw_mci_request_end(host, mrq);
2113                                 } else {
2114                                         list_del(&slot->queue_node);
2115                                         mrq->cmd->error = -ENOMEDIUM;
2116                                         if (mrq->data)
2117                                                 mrq->data->error = -ENOMEDIUM;
2118                                         if (mrq->stop)
2119                                                 mrq->stop->error = -ENOMEDIUM;
2120 
2121                                         spin_unlock(&host->lock);
2122                                         mmc_request_done(slot->mmc, mrq);
2123                                         spin_lock(&host->lock);
2124                                 }
2125                         }
2126 
2127                         /* Power down slot */
2128                         if (present == 0)
2129                                 dw_mci_reset(host);
2130 
2131                         spin_unlock_bh(&host->lock);
2132 
2133                         present = dw_mci_get_cd(mmc);
2134                 }
2135 
2136                 mmc_detect_change(slot->mmc,
2137                         msecs_to_jiffies(host->pdata->detect_delay_ms));
2138         }
2139 }
2140 
2141 #ifdef CONFIG_OF
2142 /* given a slot id, find out the device node representing that slot */
2143 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
2144 {
2145         struct device_node *np;
2146         const __be32 *addr;
2147         int len;
2148 
2149         if (!dev || !dev->of_node)
2150                 return NULL;
2151 
2152         for_each_child_of_node(dev->of_node, np) {
2153                 addr = of_get_property(np, "reg", &len);
2154                 if (!addr || (len < sizeof(int)))
2155                         continue;
2156                 if (be32_to_cpup(addr) == slot)
2157                         return np;
2158         }
2159         return NULL;
2160 }
2161 
2162 static struct dw_mci_of_slot_quirks {
2163         char *quirk;
2164         int id;
2165 } of_slot_quirks[] = {
2166         {
2167                 .quirk  = "disable-wp",
2168                 .id     = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
2169         },
2170 };
2171 
2172 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2173 {
2174         struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2175         int quirks = 0;
2176         int idx;
2177 
2178         /* get quirks */
2179         for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
2180                 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL)) {
2181                         dev_warn(dev, "Slot quirk %s is deprecated\n",
2182                                         of_slot_quirks[idx].quirk);
2183                         quirks |= of_slot_quirks[idx].id;
2184                 }
2185 
2186         return quirks;
2187 }
2188 #else /* CONFIG_OF */
2189 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2190 {
2191         return 0;
2192 }
2193 #endif /* CONFIG_OF */
2194 
2195 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2196 {
2197         struct mmc_host *mmc;
2198         struct dw_mci_slot *slot;
2199         const struct dw_mci_drv_data *drv_data = host->drv_data;
2200         int ctrl_id, ret;
2201         u32 freq[2];
2202 
2203         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2204         if (!mmc)
2205                 return -ENOMEM;
2206 
2207         slot = mmc_priv(mmc);
2208         slot->id = id;
2209         slot->mmc = mmc;
2210         slot->host = host;
2211         host->slot[id] = slot;
2212 
2213         slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
2214 
2215         mmc->ops = &dw_mci_ops;
2216         if (of_property_read_u32_array(host->dev->of_node,
2217                                        "clock-freq-min-max", freq, 2)) {
2218                 mmc->f_min = DW_MCI_FREQ_MIN;
2219                 mmc->f_max = DW_MCI_FREQ_MAX;
2220         } else {
2221                 mmc->f_min = freq[0];
2222                 mmc->f_max = freq[1];
2223         }
2224 
2225         /*if there are external regulators, get them*/
2226         ret = mmc_regulator_get_supply(mmc);
2227         if (ret == -EPROBE_DEFER)
2228                 goto err_host_allocated;
2229 
2230         if (!mmc->ocr_avail)
2231                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2232 
2233         if (host->pdata->caps)
2234                 mmc->caps = host->pdata->caps;
2235 
2236         if (host->pdata->pm_caps)
2237                 mmc->pm_caps = host->pdata->pm_caps;
2238 
2239         if (host->dev->of_node) {
2240                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2241                 if (ctrl_id < 0)
2242                         ctrl_id = 0;
2243         } else {
2244                 ctrl_id = to_platform_device(host->dev)->id;
2245         }
2246         if (drv_data && drv_data->caps)
2247                 mmc->caps |= drv_data->caps[ctrl_id];
2248 
2249         if (host->pdata->caps2)
2250                 mmc->caps2 = host->pdata->caps2;
2251 
2252         ret = mmc_of_parse(mmc);
2253         if (ret)
2254                 goto err_host_allocated;
2255 
2256         if (host->pdata->blk_settings) {
2257                 mmc->max_segs = host->pdata->blk_settings->max_segs;
2258                 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
2259                 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
2260                 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
2261                 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
2262         } else {
2263                 /* Useful defaults if platform data is unset. */
2264 #ifdef CONFIG_MMC_DW_IDMAC
2265                 mmc->max_segs = host->ring_size;
2266                 mmc->max_blk_size = 65536;
2267                 mmc->max_blk_count = host->ring_size;
2268                 mmc->max_seg_size = 0x1000;
2269                 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
2270 #else
2271                 mmc->max_segs = 64;
2272                 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
2273                 mmc->max_blk_count = 512;
2274                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2275                 mmc->max_seg_size = mmc->max_req_size;
2276 #endif /* CONFIG_MMC_DW_IDMAC */
2277         }
2278 
2279         if (dw_mci_get_cd(mmc))
2280                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2281         else
2282                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2283 
2284         ret = mmc_add_host(mmc);
2285         if (ret)
2286                 goto err_host_allocated;
2287 
2288 #if defined(CONFIG_DEBUG_FS)
2289         dw_mci_init_debugfs(slot);
2290 #endif
2291 
2292         /* Card initially undetected */
2293         slot->last_detect_state = 0;
2294 
2295         return 0;
2296 
2297 err_host_allocated:
2298         mmc_free_host(mmc);
2299         return ret;
2300 }
2301 
2302 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2303 {
2304         /* Debugfs stuff is cleaned up by mmc core */
2305         mmc_remove_host(slot->mmc);
2306         slot->host->slot[id] = NULL;
2307         mmc_free_host(slot->mmc);
2308 }
2309 
2310 static void dw_mci_init_dma(struct dw_mci *host)
2311 {
2312         /* Alloc memory for sg translation */
2313         host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2314                                           &host->sg_dma, GFP_KERNEL);
2315         if (!host->sg_cpu) {
2316                 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2317                         __func__);
2318                 goto no_dma;
2319         }
2320 
2321         /* Determine which DMA interface to use */
2322 #ifdef CONFIG_MMC_DW_IDMAC
2323         host->dma_ops = &dw_mci_idmac_ops;
2324         dev_info(host->dev, "Using internal DMA controller.\n");
2325 #endif
2326 
2327         if (!host->dma_ops)
2328                 goto no_dma;
2329 
2330         if (host->dma_ops->init && host->dma_ops->start &&
2331             host->dma_ops->stop && host->dma_ops->cleanup) {
2332                 if (host->dma_ops->init(host)) {
2333                         dev_err(host->dev, "%s: Unable to initialize "
2334                                 "DMA Controller.\n", __func__);
2335                         goto no_dma;
2336                 }
2337         } else {
2338                 dev_err(host->dev, "DMA initialization not found.\n");
2339                 goto no_dma;
2340         }
2341 
2342         host->use_dma = 1;
2343         return;
2344 
2345 no_dma:
2346         dev_info(host->dev, "Using PIO mode.\n");
2347         host->use_dma = 0;
2348         return;
2349 }
2350 
2351 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2352 {
2353         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2354         u32 ctrl;
2355 
2356         ctrl = mci_readl(host, CTRL);
2357         ctrl |= reset;
2358         mci_writel(host, CTRL, ctrl);
2359 
2360         /* wait till resets clear */
2361         do {
2362                 ctrl = mci_readl(host, CTRL);
2363                 if (!(ctrl & reset))
2364                         return true;
2365         } while (time_before(jiffies, timeout));
2366 
2367         dev_err(host->dev,
2368                 "Timeout resetting block (ctrl reset %#x)\n",
2369                 ctrl & reset);
2370 
2371         return false;
2372 }
2373 
2374 static bool dw_mci_reset(struct dw_mci *host)
2375 {
2376         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2377         bool ret = false;
2378 
2379         /*
2380          * Reseting generates a block interrupt, hence setting
2381          * the scatter-gather pointer to NULL.
2382          */
2383         if (host->sg) {
2384                 sg_miter_stop(&host->sg_miter);
2385                 host->sg = NULL;
2386         }
2387 
2388         if (host->use_dma)
2389                 flags |= SDMMC_CTRL_DMA_RESET;
2390 
2391         if (dw_mci_ctrl_reset(host, flags)) {
2392                 /*
2393                  * In all cases we clear the RAWINTS register to clear any
2394                  * interrupts.
2395                  */
2396                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2397 
2398                 /* if using dma we wait for dma_req to clear */
2399                 if (host->use_dma) {
2400                         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2401                         u32 status;
2402                         do {
2403                                 status = mci_readl(host, STATUS);
2404                                 if (!(status & SDMMC_STATUS_DMA_REQ))
2405                                         break;
2406                                 cpu_relax();
2407                         } while (time_before(jiffies, timeout));
2408 
2409                         if (status & SDMMC_STATUS_DMA_REQ) {
2410                                 dev_err(host->dev,
2411                                         "%s: Timeout waiting for dma_req to "
2412                                         "clear during reset\n", __func__);
2413                                 goto ciu_out;
2414                         }
2415 
2416                         /* when using DMA next we reset the fifo again */
2417                         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2418                                 goto ciu_out;
2419                 }
2420         } else {
2421                 /* if the controller reset bit did clear, then set clock regs */
2422                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2423                         dev_err(host->dev, "%s: fifo/dma reset bits didn't "
2424                                 "clear but ciu was reset, doing clock update\n",
2425                                 __func__);
2426                         goto ciu_out;
2427                 }
2428         }
2429 
2430 #if IS_ENABLED(CONFIG_MMC_DW_IDMAC)
2431         /* It is also recommended that we reset and reprogram idmac */
2432         dw_mci_idmac_reset(host);
2433 #endif
2434 
2435         ret = true;
2436 
2437 ciu_out:
2438         /* After a CTRL reset we need to have CIU set clock registers  */
2439         mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2440 
2441         return ret;
2442 }
2443 
2444 #ifdef CONFIG_OF
2445 static struct dw_mci_of_quirks {
2446         char *quirk;
2447         int id;
2448 } of_quirks[] = {
2449         {
2450                 .quirk  = "broken-cd",
2451                 .id     = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2452         }, {
2453                 .quirk  = "disable-wp",
2454                 .id     = DW_MCI_QUIRK_NO_WRITE_PROTECT,
2455         },
2456 };
2457 
2458 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2459 {
2460         struct dw_mci_board *pdata;
2461         struct device *dev = host->dev;
2462         struct device_node *np = dev->of_node;
2463         const struct dw_mci_drv_data *drv_data = host->drv_data;
2464         int idx, ret;
2465         u32 clock_frequency;
2466 
2467         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2468         if (!pdata) {
2469                 dev_err(dev, "could not allocate memory for pdata\n");
2470                 return ERR_PTR(-ENOMEM);
2471         }
2472 
2473         /* find out number of slots supported */
2474         if (of_property_read_u32(dev->of_node, "num-slots",
2475                                 &pdata->num_slots)) {
2476                 dev_info(dev, "num-slots property not found, "
2477                                 "assuming 1 slot is available\n");
2478                 pdata->num_slots = 1;
2479         }
2480 
2481         /* get quirks */
2482         for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2483                 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2484                         pdata->quirks |= of_quirks[idx].id;
2485 
2486         if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2487                 dev_info(dev, "fifo-depth property not found, using "
2488                                 "value of FIFOTH register as default\n");
2489 
2490         of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2491 
2492         if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2493                 pdata->bus_hz = clock_frequency;
2494 
2495         if (drv_data && drv_data->parse_dt) {
2496                 ret = drv_data->parse_dt(host);
2497                 if (ret)
2498                         return ERR_PTR(ret);
2499         }
2500 
2501         if (of_find_property(np, "supports-highspeed", NULL))
2502                 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2503 
2504         return pdata;
2505 }
2506 
2507 #else /* CONFIG_OF */
2508 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2509 {
2510         return ERR_PTR(-EINVAL);
2511 }
2512 #endif /* CONFIG_OF */
2513 
2514 int dw_mci_probe(struct dw_mci *host)
2515 {
2516         const struct dw_mci_drv_data *drv_data = host->drv_data;
2517         int width, i, ret = 0;
2518         u32 fifo_size;
2519         int init_slots = 0;
2520 
2521         if (!host->pdata) {
2522                 host->pdata = dw_mci_parse_dt(host);
2523                 if (IS_ERR(host->pdata)) {
2524                         dev_err(host->dev, "platform data not available\n");
2525                         return -EINVAL;
2526                 }
2527         }
2528 
2529         if (host->pdata->num_slots > 1) {
2530                 dev_err(host->dev,
2531                         "Platform data must supply num_slots.\n");
2532                 return -ENODEV;
2533         }
2534 
2535         host->biu_clk = devm_clk_get(host->dev, "biu");
2536         if (IS_ERR(host->biu_clk)) {
2537                 dev_dbg(host->dev, "biu clock not available\n");
2538         } else {
2539                 ret = clk_prepare_enable(host->biu_clk);
2540                 if (ret) {
2541                         dev_err(host->dev, "failed to enable biu clock\n");
2542                         return ret;
2543                 }
2544         }
2545 
2546         host->ciu_clk = devm_clk_get(host->dev, "ciu");
2547         if (IS_ERR(host->ciu_clk)) {
2548                 dev_dbg(host->dev, "ciu clock not available\n");
2549                 host->bus_hz = host->pdata->bus_hz;
2550         } else {
2551                 ret = clk_prepare_enable(host->ciu_clk);
2552                 if (ret) {
2553                         dev_err(host->dev, "failed to enable ciu clock\n");
2554                         goto err_clk_biu;
2555                 }
2556 
2557                 if (host->pdata->bus_hz) {
2558                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2559                         if (ret)
2560                                 dev_warn(host->dev,
2561                                          "Unable to set bus rate to %uHz\n",
2562                                          host->pdata->bus_hz);
2563                 }
2564                 host->bus_hz = clk_get_rate(host->ciu_clk);
2565         }
2566 
2567         if (!host->bus_hz) {
2568                 dev_err(host->dev,
2569                         "Platform data must supply bus speed\n");
2570                 ret = -ENODEV;
2571                 goto err_clk_ciu;
2572         }
2573 
2574         if (drv_data && drv_data->init) {
2575                 ret = drv_data->init(host);
2576                 if (ret) {
2577                         dev_err(host->dev,
2578                                 "implementation specific init failed\n");
2579                         goto err_clk_ciu;
2580                 }
2581         }
2582 
2583         if (drv_data && drv_data->setup_clock) {
2584                 ret = drv_data->setup_clock(host);
2585                 if (ret) {
2586                         dev_err(host->dev,
2587                                 "implementation specific clock setup failed\n");
2588                         goto err_clk_ciu;
2589                 }
2590         }
2591 
2592         host->quirks = host->pdata->quirks;
2593 
2594         spin_lock_init(&host->lock);
2595         INIT_LIST_HEAD(&host->queue);
2596 
2597         /*
2598          * Get the host data width - this assumes that HCON has been set with
2599          * the correct values.
2600          */
2601         i = (mci_readl(host, HCON) >> 7) & 0x7;
2602         if (!i) {
2603                 host->push_data = dw_mci_push_data16;
2604                 host->pull_data = dw_mci_pull_data16;
2605                 width = 16;
2606                 host->data_shift = 1;
2607         } else if (i == 2) {
2608                 host->push_data = dw_mci_push_data64;
2609                 host->pull_data = dw_mci_pull_data64;
2610                 width = 64;
2611                 host->data_shift = 3;
2612         } else {
2613                 /* Check for a reserved value, and warn if it is */
2614                 WARN((i != 1),
2615                      "HCON reports a reserved host data width!\n"
2616                      "Defaulting to 32-bit access.\n");
2617                 host->push_data = dw_mci_push_data32;
2618                 host->pull_data = dw_mci_pull_data32;
2619                 width = 32;
2620                 host->data_shift = 2;
2621         }
2622 
2623         /* Reset all blocks */
2624         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS))
2625                 return -ENODEV;
2626 
2627         host->dma_ops = host->pdata->dma_ops;
2628         dw_mci_init_dma(host);
2629 
2630         /* Clear the interrupts for the host controller */
2631         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2632         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2633 
2634         /* Put in max timeout */
2635         mci_writel(host, TMOUT, 0xFFFFFFFF);
2636 
2637         /*
2638          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
2639          *                          Tx Mark = fifo_size / 2 DMA Size = 8
2640          */
2641         if (!host->pdata->fifo_depth) {
2642                 /*
2643                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2644                  * have been overwritten by the bootloader, just like we're
2645                  * about to do, so if you know the value for your hardware, you
2646                  * should put it in the platform data.
2647                  */
2648                 fifo_size = mci_readl(host, FIFOTH);
2649                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2650         } else {
2651                 fifo_size = host->pdata->fifo_depth;
2652         }
2653         host->fifo_depth = fifo_size;
2654         host->fifoth_val =
2655                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
2656         mci_writel(host, FIFOTH, host->fifoth_val);
2657 
2658         /* disable clock to CIU */
2659         mci_writel(host, CLKENA, 0);
2660         mci_writel(host, CLKSRC, 0);
2661 
2662         /*
2663          * In 2.40a spec, Data offset is changed.
2664          * Need to check the version-id and set data-offset for DATA register.
2665          */
2666         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2667         dev_info(host->dev, "Version ID is %04x\n", host->verid);
2668 
2669         if (host->verid < DW_MMC_240A)
2670                 host->data_offset = DATA_OFFSET;
2671         else
2672                 host->data_offset = DATA_240A_OFFSET;
2673 
2674         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2675         host->card_workqueue = alloc_workqueue("dw-mci-card",
2676                         WQ_MEM_RECLAIM, 1);
2677         if (!host->card_workqueue) {
2678                 ret = -ENOMEM;
2679                 goto err_dmaunmap;
2680         }
2681         INIT_WORK(&host->card_work, dw_mci_work_routine_card);
2682         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2683                                host->irq_flags, "dw-mci", host);
2684         if (ret)
2685                 goto err_workqueue;
2686 
2687         if (host->pdata->num_slots)
2688                 host->num_slots = host->pdata->num_slots;
2689         else
2690                 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2691 
2692         /*
2693          * Enable interrupts for command done, data over, data empty, card det,
2694          * receive ready and error such as transmit, receive timeout, crc error
2695          */
2696         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2697         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2698                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2699                    DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2700         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2701 
2702         dev_info(host->dev, "DW MMC controller at irq %d, "
2703                  "%d bit host data width, "
2704                  "%u deep fifo\n",
2705                  host->irq, width, fifo_size);
2706 
2707         /* We need at least one slot to succeed */
2708         for (i = 0; i < host->num_slots; i++) {
2709                 ret = dw_mci_init_slot(host, i);
2710                 if (ret)
2711                         dev_dbg(host->dev, "slot %d init failed\n", i);
2712                 else
2713                         init_slots++;
2714         }
2715 
2716         if (init_slots) {
2717                 dev_info(host->dev, "%d slots initialized\n", init_slots);
2718         } else {
2719                 dev_dbg(host->dev, "attempted to initialize %d slots, "
2720                                         "but failed on all\n", host->num_slots);
2721                 goto err_workqueue;
2722         }
2723 
2724         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2725                 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2726 
2727         return 0;
2728 
2729 err_workqueue:
2730         destroy_workqueue(host->card_workqueue);
2731 
2732 err_dmaunmap:
2733         if (host->use_dma && host->dma_ops->exit)
2734                 host->dma_ops->exit(host);
2735 
2736 err_clk_ciu:
2737         if (!IS_ERR(host->ciu_clk))
2738                 clk_disable_unprepare(host->ciu_clk);
2739 
2740 err_clk_biu:
2741         if (!IS_ERR(host->biu_clk))
2742                 clk_disable_unprepare(host->biu_clk);
2743 
2744         return ret;
2745 }
2746 EXPORT_SYMBOL(dw_mci_probe);
2747 
2748 void dw_mci_remove(struct dw_mci *host)
2749 {
2750         int i;
2751 
2752         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2753         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2754 
2755         for (i = 0; i < host->num_slots; i++) {
2756                 dev_dbg(host->dev, "remove slot %d\n", i);
2757                 if (host->slot[i])
2758                         dw_mci_cleanup_slot(host->slot[i], i);
2759         }
2760 
2761         /* disable clock to CIU */
2762         mci_writel(host, CLKENA, 0);
2763         mci_writel(host, CLKSRC, 0);
2764 
2765         destroy_workqueue(host->card_workqueue);
2766 
2767         if (host->use_dma && host->dma_ops->exit)
2768                 host->dma_ops->exit(host);
2769 
2770         if (!IS_ERR(host->ciu_clk))
2771                 clk_disable_unprepare(host->ciu_clk);
2772 
2773         if (!IS_ERR(host->biu_clk))
2774                 clk_disable_unprepare(host->biu_clk);
2775 }
2776 EXPORT_SYMBOL(dw_mci_remove);
2777 
2778 
2779 
2780 #ifdef CONFIG_PM_SLEEP
2781 /*
2782  * TODO: we should probably disable the clock to the card in the suspend path.
2783  */
2784 int dw_mci_suspend(struct dw_mci *host)
2785 {
2786         return 0;
2787 }
2788 EXPORT_SYMBOL(dw_mci_suspend);
2789 
2790 int dw_mci_resume(struct dw_mci *host)
2791 {
2792         int i, ret;
2793 
2794         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
2795                 ret = -ENODEV;
2796                 return ret;
2797         }
2798 
2799         if (host->use_dma && host->dma_ops->init)
2800                 host->dma_ops->init(host);
2801 
2802         /*
2803          * Restore the initial value at FIFOTH register
2804          * And Invalidate the prev_blksz with zero
2805          */
2806         mci_writel(host, FIFOTH, host->fifoth_val);
2807         host->prev_blksz = 0;
2808 
2809         /* Put in max timeout */
2810         mci_writel(host, TMOUT, 0xFFFFFFFF);
2811 
2812         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2813         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2814                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2815                    DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2816         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2817 
2818         for (i = 0; i < host->num_slots; i++) {
2819                 struct dw_mci_slot *slot = host->slot[i];
2820                 if (!slot)
2821                         continue;
2822                 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2823                         dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2824                         dw_mci_setup_bus(slot, true);
2825                 }
2826         }
2827         return 0;
2828 }
2829 EXPORT_SYMBOL(dw_mci_resume);
2830 #endif /* CONFIG_PM_SLEEP */
2831 
2832 static int __init dw_mci_init(void)
2833 {
2834         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
2835         return 0;
2836 }
2837 
2838 static void __exit dw_mci_exit(void)
2839 {
2840 }
2841 
2842 module_init(dw_mci_init);
2843 module_exit(dw_mci_exit);
2844 
2845 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2846 MODULE_AUTHOR("NXP Semiconductor VietNam");
2847 MODULE_AUTHOR("Imagination Technologies Ltd");
2848 MODULE_LICENSE("GPL v2");
2849 

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