Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

Linux/drivers/mmc/host/dw_mmc.c

  1 /*
  2  * Synopsys DesignWare Multimedia Card Interface driver
  3  *  (Based on NXP driver for lpc 31xx)
  4  *
  5  * Copyright (C) 2009 NXP Semiconductors
  6  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/blkdev.h>
 15 #include <linux/clk.h>
 16 #include <linux/debugfs.h>
 17 #include <linux/device.h>
 18 #include <linux/dma-mapping.h>
 19 #include <linux/err.h>
 20 #include <linux/init.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/ioport.h>
 23 #include <linux/module.h>
 24 #include <linux/platform_device.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/slab.h>
 27 #include <linux/stat.h>
 28 #include <linux/delay.h>
 29 #include <linux/irq.h>
 30 #include <linux/mmc/card.h>
 31 #include <linux/mmc/host.h>
 32 #include <linux/mmc/mmc.h>
 33 #include <linux/mmc/sd.h>
 34 #include <linux/mmc/sdio.h>
 35 #include <linux/mmc/dw_mmc.h>
 36 #include <linux/bitops.h>
 37 #include <linux/regulator/consumer.h>
 38 #include <linux/of.h>
 39 #include <linux/of_gpio.h>
 40 #include <linux/mmc/slot-gpio.h>
 41 
 42 #include "dw_mmc.h"
 43 
 44 /* Common flag combinations */
 45 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
 46                                  SDMMC_INT_HTO | SDMMC_INT_SBE  | \
 47                                  SDMMC_INT_EBE)
 48 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
 49                                  SDMMC_INT_RESP_ERR)
 50 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
 51                                  DW_MCI_CMD_ERROR_FLAGS  | SDMMC_INT_HLE)
 52 #define DW_MCI_SEND_STATUS      1
 53 #define DW_MCI_RECV_STATUS      2
 54 #define DW_MCI_DMA_THRESHOLD    16
 55 
 56 #define DW_MCI_FREQ_MAX 200000000       /* unit: HZ */
 57 #define DW_MCI_FREQ_MIN 400000          /* unit: HZ */
 58 
 59 #ifdef CONFIG_MMC_DW_IDMAC
 60 #define IDMAC_INT_CLR           (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
 61                                  SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
 62                                  SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
 63                                  SDMMC_IDMAC_INT_TI)
 64 
 65 struct idmac_desc_64addr {
 66         u32             des0;   /* Control Descriptor */
 67 
 68         u32             des1;   /* Reserved */
 69 
 70         u32             des2;   /*Buffer sizes */
 71 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
 72         ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \
 73          ((cpu_to_le32(s)) & cpu_to_le32(0x1fff)))
 74 
 75         u32             des3;   /* Reserved */
 76 
 77         u32             des4;   /* Lower 32-bits of Buffer Address Pointer 1*/
 78         u32             des5;   /* Upper 32-bits of Buffer Address Pointer 1*/
 79 
 80         u32             des6;   /* Lower 32-bits of Next Descriptor Address */
 81         u32             des7;   /* Upper 32-bits of Next Descriptor Address */
 82 };
 83 
 84 struct idmac_desc {
 85         __le32          des0;   /* Control Descriptor */
 86 #define IDMAC_DES0_DIC  BIT(1)
 87 #define IDMAC_DES0_LD   BIT(2)
 88 #define IDMAC_DES0_FD   BIT(3)
 89 #define IDMAC_DES0_CH   BIT(4)
 90 #define IDMAC_DES0_ER   BIT(5)
 91 #define IDMAC_DES0_CES  BIT(30)
 92 #define IDMAC_DES0_OWN  BIT(31)
 93 
 94         __le32          des1;   /* Buffer sizes */
 95 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
 96         ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
 97 
 98         __le32          des2;   /* buffer 1 physical address */
 99 
100         __le32          des3;   /* buffer 2 physical address */
101 };
102 #endif /* CONFIG_MMC_DW_IDMAC */
103 
104 static bool dw_mci_reset(struct dw_mci *host);
105 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
106 static int dw_mci_card_busy(struct mmc_host *mmc);
107 
108 #if defined(CONFIG_DEBUG_FS)
109 static int dw_mci_req_show(struct seq_file *s, void *v)
110 {
111         struct dw_mci_slot *slot = s->private;
112         struct mmc_request *mrq;
113         struct mmc_command *cmd;
114         struct mmc_command *stop;
115         struct mmc_data *data;
116 
117         /* Make sure we get a consistent snapshot */
118         spin_lock_bh(&slot->host->lock);
119         mrq = slot->mrq;
120 
121         if (mrq) {
122                 cmd = mrq->cmd;
123                 data = mrq->data;
124                 stop = mrq->stop;
125 
126                 if (cmd)
127                         seq_printf(s,
128                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
129                                    cmd->opcode, cmd->arg, cmd->flags,
130                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
131                                    cmd->resp[2], cmd->error);
132                 if (data)
133                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
134                                    data->bytes_xfered, data->blocks,
135                                    data->blksz, data->flags, data->error);
136                 if (stop)
137                         seq_printf(s,
138                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
139                                    stop->opcode, stop->arg, stop->flags,
140                                    stop->resp[0], stop->resp[1], stop->resp[2],
141                                    stop->resp[2], stop->error);
142         }
143 
144         spin_unlock_bh(&slot->host->lock);
145 
146         return 0;
147 }
148 
149 static int dw_mci_req_open(struct inode *inode, struct file *file)
150 {
151         return single_open(file, dw_mci_req_show, inode->i_private);
152 }
153 
154 static const struct file_operations dw_mci_req_fops = {
155         .owner          = THIS_MODULE,
156         .open           = dw_mci_req_open,
157         .read           = seq_read,
158         .llseek         = seq_lseek,
159         .release        = single_release,
160 };
161 
162 static int dw_mci_regs_show(struct seq_file *s, void *v)
163 {
164         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
165         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
166         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
167         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
168         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
169         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
170 
171         return 0;
172 }
173 
174 static int dw_mci_regs_open(struct inode *inode, struct file *file)
175 {
176         return single_open(file, dw_mci_regs_show, inode->i_private);
177 }
178 
179 static const struct file_operations dw_mci_regs_fops = {
180         .owner          = THIS_MODULE,
181         .open           = dw_mci_regs_open,
182         .read           = seq_read,
183         .llseek         = seq_lseek,
184         .release        = single_release,
185 };
186 
187 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
188 {
189         struct mmc_host *mmc = slot->mmc;
190         struct dw_mci *host = slot->host;
191         struct dentry *root;
192         struct dentry *node;
193 
194         root = mmc->debugfs_root;
195         if (!root)
196                 return;
197 
198         node = debugfs_create_file("regs", S_IRUSR, root, host,
199                                    &dw_mci_regs_fops);
200         if (!node)
201                 goto err;
202 
203         node = debugfs_create_file("req", S_IRUSR, root, slot,
204                                    &dw_mci_req_fops);
205         if (!node)
206                 goto err;
207 
208         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
209         if (!node)
210                 goto err;
211 
212         node = debugfs_create_x32("pending_events", S_IRUSR, root,
213                                   (u32 *)&host->pending_events);
214         if (!node)
215                 goto err;
216 
217         node = debugfs_create_x32("completed_events", S_IRUSR, root,
218                                   (u32 *)&host->completed_events);
219         if (!node)
220                 goto err;
221 
222         return;
223 
224 err:
225         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
226 }
227 #endif /* defined(CONFIG_DEBUG_FS) */
228 
229 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
230 
231 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
232 {
233         struct mmc_data *data;
234         struct dw_mci_slot *slot = mmc_priv(mmc);
235         struct dw_mci *host = slot->host;
236         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
237         u32 cmdr;
238         cmd->error = -EINPROGRESS;
239 
240         cmdr = cmd->opcode;
241 
242         if (cmd->opcode == MMC_STOP_TRANSMISSION ||
243             cmd->opcode == MMC_GO_IDLE_STATE ||
244             cmd->opcode == MMC_GO_INACTIVE_STATE ||
245             (cmd->opcode == SD_IO_RW_DIRECT &&
246              ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
247                 cmdr |= SDMMC_CMD_STOP;
248         else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
249                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
250 
251         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
252                 u32 clk_en_a;
253 
254                 /* Special bit makes CMD11 not die */
255                 cmdr |= SDMMC_CMD_VOLT_SWITCH;
256 
257                 /* Change state to continue to handle CMD11 weirdness */
258                 WARN_ON(slot->host->state != STATE_SENDING_CMD);
259                 slot->host->state = STATE_SENDING_CMD11;
260 
261                 /*
262                  * We need to disable low power mode (automatic clock stop)
263                  * while doing voltage switch so we don't confuse the card,
264                  * since stopping the clock is a specific part of the UHS
265                  * voltage change dance.
266                  *
267                  * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
268                  * unconditionally turned back on in dw_mci_setup_bus() if it's
269                  * ever called with a non-zero clock.  That shouldn't happen
270                  * until the voltage change is all done.
271                  */
272                 clk_en_a = mci_readl(host, CLKENA);
273                 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
274                 mci_writel(host, CLKENA, clk_en_a);
275                 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
276                              SDMMC_CMD_PRV_DAT_WAIT, 0);
277         }
278 
279         if (cmd->flags & MMC_RSP_PRESENT) {
280                 /* We expect a response, so set this bit */
281                 cmdr |= SDMMC_CMD_RESP_EXP;
282                 if (cmd->flags & MMC_RSP_136)
283                         cmdr |= SDMMC_CMD_RESP_LONG;
284         }
285 
286         if (cmd->flags & MMC_RSP_CRC)
287                 cmdr |= SDMMC_CMD_RESP_CRC;
288 
289         data = cmd->data;
290         if (data) {
291                 cmdr |= SDMMC_CMD_DAT_EXP;
292                 if (data->flags & MMC_DATA_STREAM)
293                         cmdr |= SDMMC_CMD_STRM_MODE;
294                 if (data->flags & MMC_DATA_WRITE)
295                         cmdr |= SDMMC_CMD_DAT_WR;
296         }
297 
298         if (drv_data && drv_data->prepare_command)
299                 drv_data->prepare_command(slot->host, &cmdr);
300 
301         return cmdr;
302 }
303 
304 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
305 {
306         struct mmc_command *stop;
307         u32 cmdr;
308 
309         if (!cmd->data)
310                 return 0;
311 
312         stop = &host->stop_abort;
313         cmdr = cmd->opcode;
314         memset(stop, 0, sizeof(struct mmc_command));
315 
316         if (cmdr == MMC_READ_SINGLE_BLOCK ||
317             cmdr == MMC_READ_MULTIPLE_BLOCK ||
318             cmdr == MMC_WRITE_BLOCK ||
319             cmdr == MMC_WRITE_MULTIPLE_BLOCK ||
320             cmdr == MMC_SEND_TUNING_BLOCK ||
321             cmdr == MMC_SEND_TUNING_BLOCK_HS200) {
322                 stop->opcode = MMC_STOP_TRANSMISSION;
323                 stop->arg = 0;
324                 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
325         } else if (cmdr == SD_IO_RW_EXTENDED) {
326                 stop->opcode = SD_IO_RW_DIRECT;
327                 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
328                              ((cmd->arg >> 28) & 0x7);
329                 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
330         } else {
331                 return 0;
332         }
333 
334         cmdr = stop->opcode | SDMMC_CMD_STOP |
335                 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
336 
337         return cmdr;
338 }
339 
340 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags)
341 {
342         unsigned long timeout = jiffies + msecs_to_jiffies(500);
343 
344         /*
345          * Databook says that before issuing a new data transfer command
346          * we need to check to see if the card is busy.  Data transfer commands
347          * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that.
348          *
349          * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is
350          * expected.
351          */
352         if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) &&
353             !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) {
354                 while (mci_readl(host, STATUS) & SDMMC_STATUS_BUSY) {
355                         if (time_after(jiffies, timeout)) {
356                                 /* Command will fail; we'll pass error then */
357                                 dev_err(host->dev, "Busy; trying anyway\n");
358                                 break;
359                         }
360                         udelay(10);
361                 }
362         }
363 }
364 
365 static void dw_mci_start_command(struct dw_mci *host,
366                                  struct mmc_command *cmd, u32 cmd_flags)
367 {
368         host->cmd = cmd;
369         dev_vdbg(host->dev,
370                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
371                  cmd->arg, cmd_flags);
372 
373         mci_writel(host, CMDARG, cmd->arg);
374         wmb();
375         dw_mci_wait_while_busy(host, cmd_flags);
376 
377         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
378 }
379 
380 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
381 {
382         struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
383         dw_mci_start_command(host, stop, host->stop_cmdr);
384 }
385 
386 /* DMA interface functions */
387 static void dw_mci_stop_dma(struct dw_mci *host)
388 {
389         if (host->using_dma) {
390                 host->dma_ops->stop(host);
391                 host->dma_ops->cleanup(host);
392         }
393 
394         /* Data transfer was stopped by the interrupt handler */
395         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
396 }
397 
398 static int dw_mci_get_dma_dir(struct mmc_data *data)
399 {
400         if (data->flags & MMC_DATA_WRITE)
401                 return DMA_TO_DEVICE;
402         else
403                 return DMA_FROM_DEVICE;
404 }
405 
406 #ifdef CONFIG_MMC_DW_IDMAC
407 static void dw_mci_dma_cleanup(struct dw_mci *host)
408 {
409         struct mmc_data *data = host->data;
410 
411         if (data)
412                 if (!data->host_cookie)
413                         dma_unmap_sg(host->dev,
414                                      data->sg,
415                                      data->sg_len,
416                                      dw_mci_get_dma_dir(data));
417 }
418 
419 static void dw_mci_idmac_reset(struct dw_mci *host)
420 {
421         u32 bmod = mci_readl(host, BMOD);
422         /* Software reset of DMA */
423         bmod |= SDMMC_IDMAC_SWRESET;
424         mci_writel(host, BMOD, bmod);
425 }
426 
427 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
428 {
429         u32 temp;
430 
431         /* Disable and reset the IDMAC interface */
432         temp = mci_readl(host, CTRL);
433         temp &= ~SDMMC_CTRL_USE_IDMAC;
434         temp |= SDMMC_CTRL_DMA_RESET;
435         mci_writel(host, CTRL, temp);
436 
437         /* Stop the IDMAC running */
438         temp = mci_readl(host, BMOD);
439         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
440         temp |= SDMMC_IDMAC_SWRESET;
441         mci_writel(host, BMOD, temp);
442 }
443 
444 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
445 {
446         struct mmc_data *data = host->data;
447 
448         dev_vdbg(host->dev, "DMA complete\n");
449 
450         host->dma_ops->cleanup(host);
451 
452         /*
453          * If the card was removed, data will be NULL. No point in trying to
454          * send the stop command or waiting for NBUSY in this case.
455          */
456         if (data) {
457                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
458                 tasklet_schedule(&host->tasklet);
459         }
460 }
461 
462 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
463                                     unsigned int sg_len)
464 {
465         int i;
466         if (host->dma_64bit_address == 1) {
467                 struct idmac_desc_64addr *desc = host->sg_cpu;
468 
469                 for (i = 0; i < sg_len; i++, desc++) {
470                         unsigned int length = sg_dma_len(&data->sg[i]);
471                         u64 mem_addr = sg_dma_address(&data->sg[i]);
472 
473                         /*
474                          * Set the OWN bit and disable interrupts for this
475                          * descriptor
476                          */
477                         desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
478                                                 IDMAC_DES0_CH;
479                         /* Buffer length */
480                         IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, length);
481 
482                         /* Physical address to DMA to/from */
483                         desc->des4 = mem_addr & 0xffffffff;
484                         desc->des5 = mem_addr >> 32;
485                 }
486 
487                 /* Set first descriptor */
488                 desc = host->sg_cpu;
489                 desc->des0 |= IDMAC_DES0_FD;
490 
491                 /* Set last descriptor */
492                 desc = host->sg_cpu + (i - 1) *
493                                 sizeof(struct idmac_desc_64addr);
494                 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
495                 desc->des0 |= IDMAC_DES0_LD;
496 
497         } else {
498                 struct idmac_desc *desc = host->sg_cpu;
499 
500                 for (i = 0; i < sg_len; i++, desc++) {
501                         unsigned int length = sg_dma_len(&data->sg[i]);
502                         u32 mem_addr = sg_dma_address(&data->sg[i]);
503 
504                         /*
505                          * Set the OWN bit and disable interrupts for this
506                          * descriptor
507                          */
508                         desc->des0 = cpu_to_le32(IDMAC_DES0_OWN |
509                                         IDMAC_DES0_DIC | IDMAC_DES0_CH);
510                         /* Buffer length */
511                         IDMAC_SET_BUFFER1_SIZE(desc, length);
512 
513                         /* Physical address to DMA to/from */
514                         desc->des2 = cpu_to_le32(mem_addr);
515                 }
516 
517                 /* Set first descriptor */
518                 desc = host->sg_cpu;
519                 desc->des0 |= cpu_to_le32(IDMAC_DES0_FD);
520 
521                 /* Set last descriptor */
522                 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
523                 desc->des0 &= cpu_to_le32(~(IDMAC_DES0_CH | IDMAC_DES0_DIC));
524                 desc->des0 |= cpu_to_le32(IDMAC_DES0_LD);
525         }
526 
527         wmb();
528 }
529 
530 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
531 {
532         u32 temp;
533 
534         dw_mci_translate_sglist(host, host->data, sg_len);
535 
536         /* Make sure to reset DMA in case we did PIO before this */
537         dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
538         dw_mci_idmac_reset(host);
539 
540         /* Select IDMAC interface */
541         temp = mci_readl(host, CTRL);
542         temp |= SDMMC_CTRL_USE_IDMAC;
543         mci_writel(host, CTRL, temp);
544 
545         wmb();
546 
547         /* Enable the IDMAC */
548         temp = mci_readl(host, BMOD);
549         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
550         mci_writel(host, BMOD, temp);
551 
552         /* Start it running */
553         mci_writel(host, PLDMND, 1);
554 }
555 
556 static int dw_mci_idmac_init(struct dw_mci *host)
557 {
558         int i;
559 
560         if (host->dma_64bit_address == 1) {
561                 struct idmac_desc_64addr *p;
562                 /* Number of descriptors in the ring buffer */
563                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
564 
565                 /* Forward link the descriptor list */
566                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
567                                                                 i++, p++) {
568                         p->des6 = (host->sg_dma +
569                                         (sizeof(struct idmac_desc_64addr) *
570                                                         (i + 1))) & 0xffffffff;
571 
572                         p->des7 = (u64)(host->sg_dma +
573                                         (sizeof(struct idmac_desc_64addr) *
574                                                         (i + 1))) >> 32;
575                         /* Initialize reserved and buffer size fields to "" */
576                         p->des1 = 0;
577                         p->des2 = 0;
578                         p->des3 = 0;
579                 }
580 
581                 /* Set the last descriptor as the end-of-ring descriptor */
582                 p->des6 = host->sg_dma & 0xffffffff;
583                 p->des7 = (u64)host->sg_dma >> 32;
584                 p->des0 = IDMAC_DES0_ER;
585 
586         } else {
587                 struct idmac_desc *p;
588                 /* Number of descriptors in the ring buffer */
589                 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
590 
591                 /* Forward link the descriptor list */
592                 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++) {
593                         p->des3 = cpu_to_le32(host->sg_dma +
594                                         (sizeof(struct idmac_desc) * (i + 1)));
595                         p->des1 = 0;
596                 }
597 
598                 /* Set the last descriptor as the end-of-ring descriptor */
599                 p->des3 = cpu_to_le32(host->sg_dma);
600                 p->des0 = cpu_to_le32(IDMAC_DES0_ER);
601         }
602 
603         dw_mci_idmac_reset(host);
604 
605         if (host->dma_64bit_address == 1) {
606                 /* Mask out interrupts - get Tx & Rx complete only */
607                 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
608                 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
609                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
610 
611                 /* Set the descriptor base address */
612                 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
613                 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
614 
615         } else {
616                 /* Mask out interrupts - get Tx & Rx complete only */
617                 mci_writel(host, IDSTS, IDMAC_INT_CLR);
618                 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
619                                 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
620 
621                 /* Set the descriptor base address */
622                 mci_writel(host, DBADDR, host->sg_dma);
623         }
624 
625         return 0;
626 }
627 
628 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
629         .init = dw_mci_idmac_init,
630         .start = dw_mci_idmac_start_dma,
631         .stop = dw_mci_idmac_stop_dma,
632         .complete = dw_mci_idmac_complete_dma,
633         .cleanup = dw_mci_dma_cleanup,
634 };
635 #endif /* CONFIG_MMC_DW_IDMAC */
636 
637 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
638                                    struct mmc_data *data,
639                                    bool next)
640 {
641         struct scatterlist *sg;
642         unsigned int i, sg_len;
643 
644         if (!next && data->host_cookie)
645                 return data->host_cookie;
646 
647         /*
648          * We don't do DMA on "complex" transfers, i.e. with
649          * non-word-aligned buffers or lengths. Also, we don't bother
650          * with all the DMA setup overhead for short transfers.
651          */
652         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
653                 return -EINVAL;
654 
655         if (data->blksz & 3)
656                 return -EINVAL;
657 
658         for_each_sg(data->sg, sg, data->sg_len, i) {
659                 if (sg->offset & 3 || sg->length & 3)
660                         return -EINVAL;
661         }
662 
663         sg_len = dma_map_sg(host->dev,
664                             data->sg,
665                             data->sg_len,
666                             dw_mci_get_dma_dir(data));
667         if (sg_len == 0)
668                 return -EINVAL;
669 
670         if (next)
671                 data->host_cookie = sg_len;
672 
673         return sg_len;
674 }
675 
676 static void dw_mci_pre_req(struct mmc_host *mmc,
677                            struct mmc_request *mrq,
678                            bool is_first_req)
679 {
680         struct dw_mci_slot *slot = mmc_priv(mmc);
681         struct mmc_data *data = mrq->data;
682 
683         if (!slot->host->use_dma || !data)
684                 return;
685 
686         if (data->host_cookie) {
687                 data->host_cookie = 0;
688                 return;
689         }
690 
691         if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
692                 data->host_cookie = 0;
693 }
694 
695 static void dw_mci_post_req(struct mmc_host *mmc,
696                             struct mmc_request *mrq,
697                             int err)
698 {
699         struct dw_mci_slot *slot = mmc_priv(mmc);
700         struct mmc_data *data = mrq->data;
701 
702         if (!slot->host->use_dma || !data)
703                 return;
704 
705         if (data->host_cookie)
706                 dma_unmap_sg(slot->host->dev,
707                              data->sg,
708                              data->sg_len,
709                              dw_mci_get_dma_dir(data));
710         data->host_cookie = 0;
711 }
712 
713 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
714 {
715 #ifdef CONFIG_MMC_DW_IDMAC
716         unsigned int blksz = data->blksz;
717         const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
718         u32 fifo_width = 1 << host->data_shift;
719         u32 blksz_depth = blksz / fifo_width, fifoth_val;
720         u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
721         int idx = (sizeof(mszs) / sizeof(mszs[0])) - 1;
722 
723         tx_wmark = (host->fifo_depth) / 2;
724         tx_wmark_invers = host->fifo_depth - tx_wmark;
725 
726         /*
727          * MSIZE is '1',
728          * if blksz is not a multiple of the FIFO width
729          */
730         if (blksz % fifo_width) {
731                 msize = 0;
732                 rx_wmark = 1;
733                 goto done;
734         }
735 
736         do {
737                 if (!((blksz_depth % mszs[idx]) ||
738                      (tx_wmark_invers % mszs[idx]))) {
739                         msize = idx;
740                         rx_wmark = mszs[idx] - 1;
741                         break;
742                 }
743         } while (--idx > 0);
744         /*
745          * If idx is '', it won't be tried
746          * Thus, initial values are uesed
747          */
748 done:
749         fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
750         mci_writel(host, FIFOTH, fifoth_val);
751 #endif
752 }
753 
754 static void dw_mci_ctrl_rd_thld(struct dw_mci *host, struct mmc_data *data)
755 {
756         unsigned int blksz = data->blksz;
757         u32 blksz_depth, fifo_depth;
758         u16 thld_size;
759 
760         WARN_ON(!(data->flags & MMC_DATA_READ));
761 
762         /*
763          * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
764          * in the FIFO region, so we really shouldn't access it).
765          */
766         if (host->verid < DW_MMC_240A)
767                 return;
768 
769         if (host->timing != MMC_TIMING_MMC_HS200 &&
770             host->timing != MMC_TIMING_MMC_HS400 &&
771             host->timing != MMC_TIMING_UHS_SDR104)
772                 goto disable;
773 
774         blksz_depth = blksz / (1 << host->data_shift);
775         fifo_depth = host->fifo_depth;
776 
777         if (blksz_depth > fifo_depth)
778                 goto disable;
779 
780         /*
781          * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
782          * If (blksz_depth) <  (fifo_depth >> 1), should be thld_size = blksz
783          * Currently just choose blksz.
784          */
785         thld_size = blksz;
786         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(thld_size, 1));
787         return;
788 
789 disable:
790         mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(0, 0));
791 }
792 
793 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
794 {
795         unsigned long irqflags;
796         int sg_len;
797         u32 temp;
798 
799         host->using_dma = 0;
800 
801         /* If we don't have a channel, we can't do DMA */
802         if (!host->use_dma)
803                 return -ENODEV;
804 
805         sg_len = dw_mci_pre_dma_transfer(host, data, 0);
806         if (sg_len < 0) {
807                 host->dma_ops->stop(host);
808                 return sg_len;
809         }
810 
811         host->using_dma = 1;
812 
813         dev_vdbg(host->dev,
814                  "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
815                  (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
816                  sg_len);
817 
818         /*
819          * Decide the MSIZE and RX/TX Watermark.
820          * If current block size is same with previous size,
821          * no need to update fifoth.
822          */
823         if (host->prev_blksz != data->blksz)
824                 dw_mci_adjust_fifoth(host, data);
825 
826         /* Enable the DMA interface */
827         temp = mci_readl(host, CTRL);
828         temp |= SDMMC_CTRL_DMA_ENABLE;
829         mci_writel(host, CTRL, temp);
830 
831         /* Disable RX/TX IRQs, let DMA handle it */
832         spin_lock_irqsave(&host->irq_lock, irqflags);
833         temp = mci_readl(host, INTMASK);
834         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
835         mci_writel(host, INTMASK, temp);
836         spin_unlock_irqrestore(&host->irq_lock, irqflags);
837 
838         host->dma_ops->start(host, sg_len);
839 
840         return 0;
841 }
842 
843 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
844 {
845         unsigned long irqflags;
846         u32 temp;
847 
848         data->error = -EINPROGRESS;
849 
850         WARN_ON(host->data);
851         host->sg = NULL;
852         host->data = data;
853 
854         if (data->flags & MMC_DATA_READ) {
855                 host->dir_status = DW_MCI_RECV_STATUS;
856                 dw_mci_ctrl_rd_thld(host, data);
857         } else {
858                 host->dir_status = DW_MCI_SEND_STATUS;
859         }
860 
861         if (dw_mci_submit_data_dma(host, data)) {
862                 int flags = SG_MITER_ATOMIC;
863                 if (host->data->flags & MMC_DATA_READ)
864                         flags |= SG_MITER_TO_SG;
865                 else
866                         flags |= SG_MITER_FROM_SG;
867 
868                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
869                 host->sg = data->sg;
870                 host->part_buf_start = 0;
871                 host->part_buf_count = 0;
872 
873                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
874 
875                 spin_lock_irqsave(&host->irq_lock, irqflags);
876                 temp = mci_readl(host, INTMASK);
877                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
878                 mci_writel(host, INTMASK, temp);
879                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
880 
881                 temp = mci_readl(host, CTRL);
882                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
883                 mci_writel(host, CTRL, temp);
884 
885                 /*
886                  * Use the initial fifoth_val for PIO mode.
887                  * If next issued data may be transfered by DMA mode,
888                  * prev_blksz should be invalidated.
889                  */
890                 mci_writel(host, FIFOTH, host->fifoth_val);
891                 host->prev_blksz = 0;
892         } else {
893                 /*
894                  * Keep the current block size.
895                  * It will be used to decide whether to update
896                  * fifoth register next time.
897                  */
898                 host->prev_blksz = data->blksz;
899         }
900 }
901 
902 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
903 {
904         struct dw_mci *host = slot->host;
905         unsigned long timeout = jiffies + msecs_to_jiffies(500);
906         unsigned int cmd_status = 0;
907 
908         mci_writel(host, CMDARG, arg);
909         wmb();
910         dw_mci_wait_while_busy(host, cmd);
911         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
912 
913         while (time_before(jiffies, timeout)) {
914                 cmd_status = mci_readl(host, CMD);
915                 if (!(cmd_status & SDMMC_CMD_START))
916                         return;
917         }
918         dev_err(&slot->mmc->class_dev,
919                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
920                 cmd, arg, cmd_status);
921 }
922 
923 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
924 {
925         struct dw_mci *host = slot->host;
926         unsigned int clock = slot->clock;
927         u32 div;
928         u32 clk_en_a;
929         u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
930 
931         /* We must continue to set bit 28 in CMD until the change is complete */
932         if (host->state == STATE_WAITING_CMD11_DONE)
933                 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
934 
935         if (!clock) {
936                 mci_writel(host, CLKENA, 0);
937                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
938         } else if (clock != host->current_speed || force_clkinit) {
939                 div = host->bus_hz / clock;
940                 if (host->bus_hz % clock && host->bus_hz > clock)
941                         /*
942                          * move the + 1 after the divide to prevent
943                          * over-clocking the card.
944                          */
945                         div += 1;
946 
947                 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
948 
949                 if ((clock << div) != slot->__clk_old || force_clkinit)
950                         dev_info(&slot->mmc->class_dev,
951                                  "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
952                                  slot->id, host->bus_hz, clock,
953                                  div ? ((host->bus_hz / div) >> 1) :
954                                  host->bus_hz, div);
955 
956                 /* disable clock */
957                 mci_writel(host, CLKENA, 0);
958                 mci_writel(host, CLKSRC, 0);
959 
960                 /* inform CIU */
961                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
962 
963                 /* set clock to desired speed */
964                 mci_writel(host, CLKDIV, div);
965 
966                 /* inform CIU */
967                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
968 
969                 /* enable clock; only low power if no SDIO */
970                 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
971                 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags))
972                         clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
973                 mci_writel(host, CLKENA, clk_en_a);
974 
975                 /* inform CIU */
976                 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
977 
978                 /* keep the clock with reflecting clock dividor */
979                 slot->__clk_old = clock << div;
980         }
981 
982         host->current_speed = clock;
983 
984         /* Set the current slot bus width */
985         mci_writel(host, CTYPE, (slot->ctype << slot->id));
986 }
987 
988 static void __dw_mci_start_request(struct dw_mci *host,
989                                    struct dw_mci_slot *slot,
990                                    struct mmc_command *cmd)
991 {
992         struct mmc_request *mrq;
993         struct mmc_data *data;
994         u32 cmdflags;
995 
996         mrq = slot->mrq;
997 
998         host->cur_slot = slot;
999         host->mrq = mrq;
1000 
1001         host->pending_events = 0;
1002         host->completed_events = 0;
1003         host->cmd_status = 0;
1004         host->data_status = 0;
1005         host->dir_status = 0;
1006 
1007         data = cmd->data;
1008         if (data) {
1009                 mci_writel(host, TMOUT, 0xFFFFFFFF);
1010                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
1011                 mci_writel(host, BLKSIZ, data->blksz);
1012         }
1013 
1014         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
1015 
1016         /* this is the first command, send the initialization clock */
1017         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
1018                 cmdflags |= SDMMC_CMD_INIT;
1019 
1020         if (data) {
1021                 dw_mci_submit_data(host, data);
1022                 wmb();
1023         }
1024 
1025         dw_mci_start_command(host, cmd, cmdflags);
1026 
1027         if (cmd->opcode == SD_SWITCH_VOLTAGE) {
1028                 unsigned long irqflags;
1029 
1030                 /*
1031                  * Databook says to fail after 2ms w/ no response, but evidence
1032                  * shows that sometimes the cmd11 interrupt takes over 130ms.
1033                  * We'll set to 500ms, plus an extra jiffy just in case jiffies
1034                  * is just about to roll over.
1035                  *
1036                  * We do this whole thing under spinlock and only if the
1037                  * command hasn't already completed (indicating the the irq
1038                  * already ran so we don't want the timeout).
1039                  */
1040                 spin_lock_irqsave(&host->irq_lock, irqflags);
1041                 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events))
1042                         mod_timer(&host->cmd11_timer,
1043                                 jiffies + msecs_to_jiffies(500) + 1);
1044                 spin_unlock_irqrestore(&host->irq_lock, irqflags);
1045         }
1046 
1047         if (mrq->stop)
1048                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
1049         else
1050                 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
1051 }
1052 
1053 static void dw_mci_start_request(struct dw_mci *host,
1054                                  struct dw_mci_slot *slot)
1055 {
1056         struct mmc_request *mrq = slot->mrq;
1057         struct mmc_command *cmd;
1058 
1059         cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
1060         __dw_mci_start_request(host, slot, cmd);
1061 }
1062 
1063 /* must be called with host->lock held */
1064 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1065                                  struct mmc_request *mrq)
1066 {
1067         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1068                  host->state);
1069 
1070         slot->mrq = mrq;
1071 
1072         if (host->state == STATE_WAITING_CMD11_DONE) {
1073                 dev_warn(&slot->mmc->class_dev,
1074                          "Voltage change didn't complete\n");
1075                 /*
1076                  * this case isn't expected to happen, so we can
1077                  * either crash here or just try to continue on
1078                  * in the closest possible state
1079                  */
1080                 host->state = STATE_IDLE;
1081         }
1082 
1083         if (host->state == STATE_IDLE) {
1084                 host->state = STATE_SENDING_CMD;
1085                 dw_mci_start_request(host, slot);
1086         } else {
1087                 list_add_tail(&slot->queue_node, &host->queue);
1088         }
1089 }
1090 
1091 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1092 {
1093         struct dw_mci_slot *slot = mmc_priv(mmc);
1094         struct dw_mci *host = slot->host;
1095 
1096         WARN_ON(slot->mrq);
1097 
1098         /*
1099          * The check for card presence and queueing of the request must be
1100          * atomic, otherwise the card could be removed in between and the
1101          * request wouldn't fail until another card was inserted.
1102          */
1103         spin_lock_bh(&host->lock);
1104 
1105         if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
1106                 spin_unlock_bh(&host->lock);
1107                 mrq->cmd->error = -ENOMEDIUM;
1108                 mmc_request_done(mmc, mrq);
1109                 return;
1110         }
1111 
1112         dw_mci_queue_request(host, slot, mrq);
1113 
1114         spin_unlock_bh(&host->lock);
1115 }
1116 
1117 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1118 {
1119         struct dw_mci_slot *slot = mmc_priv(mmc);
1120         const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1121         u32 regs;
1122         int ret;
1123 
1124         switch (ios->bus_width) {
1125         case MMC_BUS_WIDTH_4:
1126                 slot->ctype = SDMMC_CTYPE_4BIT;
1127                 break;
1128         case MMC_BUS_WIDTH_8:
1129                 slot->ctype = SDMMC_CTYPE_8BIT;
1130                 break;
1131         default:
1132                 /* set default 1 bit mode */
1133                 slot->ctype = SDMMC_CTYPE_1BIT;
1134         }
1135 
1136         regs = mci_readl(slot->host, UHS_REG);
1137 
1138         /* DDR mode set */
1139         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
1140             ios->timing == MMC_TIMING_MMC_HS400)
1141                 regs |= ((0x1 << slot->id) << 16);
1142         else
1143                 regs &= ~((0x1 << slot->id) << 16);
1144 
1145         mci_writel(slot->host, UHS_REG, regs);
1146         slot->host->timing = ios->timing;
1147 
1148         /*
1149          * Use mirror of ios->clock to prevent race with mmc
1150          * core ios update when finding the minimum.
1151          */
1152         slot->clock = ios->clock;
1153 
1154         if (drv_data && drv_data->set_ios)
1155                 drv_data->set_ios(slot->host, ios);
1156 
1157         switch (ios->power_mode) {
1158         case MMC_POWER_UP:
1159                 if (!IS_ERR(mmc->supply.vmmc)) {
1160                         ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1161                                         ios->vdd);
1162                         if (ret) {
1163                                 dev_err(slot->host->dev,
1164                                         "failed to enable vmmc regulator\n");
1165                                 /*return, if failed turn on vmmc*/
1166                                 return;
1167                         }
1168                 }
1169                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1170                 regs = mci_readl(slot->host, PWREN);
1171                 regs |= (1 << slot->id);
1172                 mci_writel(slot->host, PWREN, regs);
1173                 break;
1174         case MMC_POWER_ON:
1175                 if (!slot->host->vqmmc_enabled) {
1176                         if (!IS_ERR(mmc->supply.vqmmc)) {
1177                                 ret = regulator_enable(mmc->supply.vqmmc);
1178                                 if (ret < 0)
1179                                         dev_err(slot->host->dev,
1180                                                 "failed to enable vqmmc\n");
1181                                 else
1182                                         slot->host->vqmmc_enabled = true;
1183 
1184                         } else {
1185                                 /* Keep track so we don't reset again */
1186                                 slot->host->vqmmc_enabled = true;
1187                         }
1188 
1189                         /* Reset our state machine after powering on */
1190                         dw_mci_ctrl_reset(slot->host,
1191                                           SDMMC_CTRL_ALL_RESET_FLAGS);
1192                 }
1193 
1194                 /* Adjust clock / bus width after power is up */
1195                 dw_mci_setup_bus(slot, false);
1196 
1197                 break;
1198         case MMC_POWER_OFF:
1199                 /* Turn clock off before power goes down */
1200                 dw_mci_setup_bus(slot, false);
1201 
1202                 if (!IS_ERR(mmc->supply.vmmc))
1203                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1204 
1205                 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled)
1206                         regulator_disable(mmc->supply.vqmmc);
1207                 slot->host->vqmmc_enabled = false;
1208 
1209                 regs = mci_readl(slot->host, PWREN);
1210                 regs &= ~(1 << slot->id);
1211                 mci_writel(slot->host, PWREN, regs);
1212                 break;
1213         default:
1214                 break;
1215         }
1216 
1217         if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1218                 slot->host->state = STATE_IDLE;
1219 }
1220 
1221 static int dw_mci_card_busy(struct mmc_host *mmc)
1222 {
1223         struct dw_mci_slot *slot = mmc_priv(mmc);
1224         u32 status;
1225 
1226         /*
1227          * Check the busy bit which is low when DAT[3:0]
1228          * (the data lines) are 0000
1229          */
1230         status = mci_readl(slot->host, STATUS);
1231 
1232         return !!(status & SDMMC_STATUS_BUSY);
1233 }
1234 
1235 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1236 {
1237         struct dw_mci_slot *slot = mmc_priv(mmc);
1238         struct dw_mci *host = slot->host;
1239         u32 uhs;
1240         u32 v18 = SDMMC_UHS_18V << slot->id;
1241         int min_uv, max_uv;
1242         int ret;
1243 
1244         /*
1245          * Program the voltage.  Note that some instances of dw_mmc may use
1246          * the UHS_REG for this.  For other instances (like exynos) the UHS_REG
1247          * does no harm but you need to set the regulator directly.  Try both.
1248          */
1249         uhs = mci_readl(host, UHS_REG);
1250         if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1251                 min_uv = 2700000;
1252                 max_uv = 3600000;
1253                 uhs &= ~v18;
1254         } else {
1255                 min_uv = 1700000;
1256                 max_uv = 1950000;
1257                 uhs |= v18;
1258         }
1259         if (!IS_ERR(mmc->supply.vqmmc)) {
1260                 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
1261 
1262                 if (ret) {
1263                         dev_dbg(&mmc->class_dev,
1264                                          "Regulator set error %d: %d - %d\n",
1265                                          ret, min_uv, max_uv);
1266                         return ret;
1267                 }
1268         }
1269         mci_writel(host, UHS_REG, uhs);
1270 
1271         return 0;
1272 }
1273 
1274 static int dw_mci_get_ro(struct mmc_host *mmc)
1275 {
1276         int read_only;
1277         struct dw_mci_slot *slot = mmc_priv(mmc);
1278         int gpio_ro = mmc_gpio_get_ro(mmc);
1279 
1280         /* Use platform get_ro function, else try on board write protect */
1281         if ((slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT) ||
1282                         (slot->host->quirks & DW_MCI_QUIRK_NO_WRITE_PROTECT))
1283                 read_only = 0;
1284         else if (!IS_ERR_VALUE(gpio_ro))
1285                 read_only = gpio_ro;
1286         else
1287                 read_only =
1288                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1289 
1290         dev_dbg(&mmc->class_dev, "card is %s\n",
1291                 read_only ? "read-only" : "read-write");
1292 
1293         return read_only;
1294 }
1295 
1296 static int dw_mci_get_cd(struct mmc_host *mmc)
1297 {
1298         int present;
1299         struct dw_mci_slot *slot = mmc_priv(mmc);
1300         struct dw_mci_board *brd = slot->host->pdata;
1301         struct dw_mci *host = slot->host;
1302         int gpio_cd = mmc_gpio_get_cd(mmc);
1303 
1304         /* Use platform get_cd function, else try onboard card detect */
1305         if ((brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION) ||
1306             (mmc->caps & MMC_CAP_NONREMOVABLE))
1307                 present = 1;
1308         else if (!IS_ERR_VALUE(gpio_cd))
1309                 present = gpio_cd;
1310         else
1311                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1312                         == 0 ? 1 : 0;
1313 
1314         spin_lock_bh(&host->lock);
1315         if (present) {
1316                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1317                 dev_dbg(&mmc->class_dev, "card is present\n");
1318         } else {
1319                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1320                 dev_dbg(&mmc->class_dev, "card is not present\n");
1321         }
1322         spin_unlock_bh(&host->lock);
1323 
1324         return present;
1325 }
1326 
1327 static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card)
1328 {
1329         struct dw_mci_slot *slot = mmc_priv(mmc);
1330         struct dw_mci *host = slot->host;
1331 
1332         /*
1333          * Low power mode will stop the card clock when idle.  According to the
1334          * description of the CLKENA register we should disable low power mode
1335          * for SDIO cards if we need SDIO interrupts to work.
1336          */
1337         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1338                 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1339                 u32 clk_en_a_old;
1340                 u32 clk_en_a;
1341 
1342                 clk_en_a_old = mci_readl(host, CLKENA);
1343 
1344                 if (card->type == MMC_TYPE_SDIO ||
1345                     card->type == MMC_TYPE_SD_COMBO) {
1346                         set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1347                         clk_en_a = clk_en_a_old & ~clken_low_pwr;
1348                 } else {
1349                         clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags);
1350                         clk_en_a = clk_en_a_old | clken_low_pwr;
1351                 }
1352 
1353                 if (clk_en_a != clk_en_a_old) {
1354                         mci_writel(host, CLKENA, clk_en_a);
1355                         mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1356                                      SDMMC_CMD_PRV_DAT_WAIT, 0);
1357                 }
1358         }
1359 }
1360 
1361 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1362 {
1363         struct dw_mci_slot *slot = mmc_priv(mmc);
1364         struct dw_mci *host = slot->host;
1365         unsigned long irqflags;
1366         u32 int_mask;
1367 
1368         spin_lock_irqsave(&host->irq_lock, irqflags);
1369 
1370         /* Enable/disable Slot Specific SDIO interrupt */
1371         int_mask = mci_readl(host, INTMASK);
1372         if (enb)
1373                 int_mask |= SDMMC_INT_SDIO(slot->sdio_id);
1374         else
1375                 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id);
1376         mci_writel(host, INTMASK, int_mask);
1377 
1378         spin_unlock_irqrestore(&host->irq_lock, irqflags);
1379 }
1380 
1381 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1382 {
1383         struct dw_mci_slot *slot = mmc_priv(mmc);
1384         struct dw_mci *host = slot->host;
1385         const struct dw_mci_drv_data *drv_data = host->drv_data;
1386         int err = -ENOSYS;
1387 
1388         if (drv_data && drv_data->execute_tuning)
1389                 err = drv_data->execute_tuning(slot);
1390         return err;
1391 }
1392 
1393 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1394 {
1395         struct dw_mci_slot *slot = mmc_priv(mmc);
1396         struct dw_mci *host = slot->host;
1397         const struct dw_mci_drv_data *drv_data = host->drv_data;
1398 
1399         if (drv_data && drv_data->prepare_hs400_tuning)
1400                 return drv_data->prepare_hs400_tuning(host, ios);
1401 
1402         return 0;
1403 }
1404 
1405 static const struct mmc_host_ops dw_mci_ops = {
1406         .request                = dw_mci_request,
1407         .pre_req                = dw_mci_pre_req,
1408         .post_req               = dw_mci_post_req,
1409         .set_ios                = dw_mci_set_ios,
1410         .get_ro                 = dw_mci_get_ro,
1411         .get_cd                 = dw_mci_get_cd,
1412         .enable_sdio_irq        = dw_mci_enable_sdio_irq,
1413         .execute_tuning         = dw_mci_execute_tuning,
1414         .card_busy              = dw_mci_card_busy,
1415         .start_signal_voltage_switch = dw_mci_switch_voltage,
1416         .init_card              = dw_mci_init_card,
1417         .prepare_hs400_tuning   = dw_mci_prepare_hs400_tuning,
1418 };
1419 
1420 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1421         __releases(&host->lock)
1422         __acquires(&host->lock)
1423 {
1424         struct dw_mci_slot *slot;
1425         struct mmc_host *prev_mmc = host->cur_slot->mmc;
1426 
1427         WARN_ON(host->cmd || host->data);
1428 
1429         host->cur_slot->mrq = NULL;
1430         host->mrq = NULL;
1431         if (!list_empty(&host->queue)) {
1432                 slot = list_entry(host->queue.next,
1433                                   struct dw_mci_slot, queue_node);
1434                 list_del(&slot->queue_node);
1435                 dev_vdbg(host->dev, "list not empty: %s is next\n",
1436                          mmc_hostname(slot->mmc));
1437                 host->state = STATE_SENDING_CMD;
1438                 dw_mci_start_request(host, slot);
1439         } else {
1440                 dev_vdbg(host->dev, "list empty\n");
1441 
1442                 if (host->state == STATE_SENDING_CMD11)
1443                         host->state = STATE_WAITING_CMD11_DONE;
1444                 else
1445                         host->state = STATE_IDLE;
1446         }
1447 
1448         spin_unlock(&host->lock);
1449         mmc_request_done(prev_mmc, mrq);
1450         spin_lock(&host->lock);
1451 }
1452 
1453 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1454 {
1455         u32 status = host->cmd_status;
1456 
1457         host->cmd_status = 0;
1458 
1459         /* Read the response from the card (up to 16 bytes) */
1460         if (cmd->flags & MMC_RSP_PRESENT) {
1461                 if (cmd->flags & MMC_RSP_136) {
1462                         cmd->resp[3] = mci_readl(host, RESP0);
1463                         cmd->resp[2] = mci_readl(host, RESP1);
1464                         cmd->resp[1] = mci_readl(host, RESP2);
1465                         cmd->resp[0] = mci_readl(host, RESP3);
1466                 } else {
1467                         cmd->resp[0] = mci_readl(host, RESP0);
1468                         cmd->resp[1] = 0;
1469                         cmd->resp[2] = 0;
1470                         cmd->resp[3] = 0;
1471                 }
1472         }
1473 
1474         if (status & SDMMC_INT_RTO)
1475                 cmd->error = -ETIMEDOUT;
1476         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1477                 cmd->error = -EILSEQ;
1478         else if (status & SDMMC_INT_RESP_ERR)
1479                 cmd->error = -EIO;
1480         else
1481                 cmd->error = 0;
1482 
1483         if (cmd->error) {
1484                 /* newer ip versions need a delay between retries */
1485                 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1486                         mdelay(20);
1487         }
1488 
1489         return cmd->error;
1490 }
1491 
1492 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1493 {
1494         u32 status = host->data_status;
1495 
1496         if (status & DW_MCI_DATA_ERROR_FLAGS) {
1497                 if (status & SDMMC_INT_DRTO) {
1498                         data->error = -ETIMEDOUT;
1499                 } else if (status & SDMMC_INT_DCRC) {
1500                         data->error = -EILSEQ;
1501                 } else if (status & SDMMC_INT_EBE) {
1502                         if (host->dir_status ==
1503                                 DW_MCI_SEND_STATUS) {
1504                                 /*
1505                                  * No data CRC status was returned.
1506                                  * The number of bytes transferred
1507                                  * will be exaggerated in PIO mode.
1508                                  */
1509                                 data->bytes_xfered = 0;
1510                                 data->error = -ETIMEDOUT;
1511                         } else if (host->dir_status ==
1512                                         DW_MCI_RECV_STATUS) {
1513                                 data->error = -EIO;
1514                         }
1515                 } else {
1516                         /* SDMMC_INT_SBE is included */
1517                         data->error = -EIO;
1518                 }
1519 
1520                 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1521 
1522                 /*
1523                  * After an error, there may be data lingering
1524                  * in the FIFO
1525                  */
1526                 dw_mci_reset(host);
1527         } else {
1528                 data->bytes_xfered = data->blocks * data->blksz;
1529                 data->error = 0;
1530         }
1531 
1532         return data->error;
1533 }
1534 
1535 static void dw_mci_tasklet_func(unsigned long priv)
1536 {
1537         struct dw_mci *host = (struct dw_mci *)priv;
1538         struct mmc_data *data;
1539         struct mmc_command *cmd;
1540         struct mmc_request *mrq;
1541         enum dw_mci_state state;
1542         enum dw_mci_state prev_state;
1543         unsigned int err;
1544 
1545         spin_lock(&host->lock);
1546 
1547         state = host->state;
1548         data = host->data;
1549         mrq = host->mrq;
1550 
1551         do {
1552                 prev_state = state;
1553 
1554                 switch (state) {
1555                 case STATE_IDLE:
1556                 case STATE_WAITING_CMD11_DONE:
1557                         break;
1558 
1559                 case STATE_SENDING_CMD11:
1560                 case STATE_SENDING_CMD:
1561                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1562                                                 &host->pending_events))
1563                                 break;
1564 
1565                         cmd = host->cmd;
1566                         host->cmd = NULL;
1567                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1568                         err = dw_mci_command_complete(host, cmd);
1569                         if (cmd == mrq->sbc && !err) {
1570                                 prev_state = state = STATE_SENDING_CMD;
1571                                 __dw_mci_start_request(host, host->cur_slot,
1572                                                        mrq->cmd);
1573                                 goto unlock;
1574                         }
1575 
1576                         if (cmd->data && err) {
1577                                 dw_mci_stop_dma(host);
1578                                 send_stop_abort(host, data);
1579                                 state = STATE_SENDING_STOP;
1580                                 break;
1581                         }
1582 
1583                         if (!cmd->data || err) {
1584                                 dw_mci_request_end(host, mrq);
1585                                 goto unlock;
1586                         }
1587 
1588                         prev_state = state = STATE_SENDING_DATA;
1589                         /* fall through */
1590 
1591                 case STATE_SENDING_DATA:
1592                         /*
1593                          * We could get a data error and never a transfer
1594                          * complete so we'd better check for it here.
1595                          *
1596                          * Note that we don't really care if we also got a
1597                          * transfer complete; stopping the DMA and sending an
1598                          * abort won't hurt.
1599                          */
1600                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1601                                                &host->pending_events)) {
1602                                 dw_mci_stop_dma(host);
1603                                 if (data->stop ||
1604                                     !(host->data_status & (SDMMC_INT_DRTO |
1605                                                            SDMMC_INT_EBE)))
1606                                         send_stop_abort(host, data);
1607                                 state = STATE_DATA_ERROR;
1608                                 break;
1609                         }
1610 
1611                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1612                                                 &host->pending_events))
1613                                 break;
1614 
1615                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1616 
1617                         /*
1618                          * Handle an EVENT_DATA_ERROR that might have shown up
1619                          * before the transfer completed.  This might not have
1620                          * been caught by the check above because the interrupt
1621                          * could have gone off between the previous check and
1622                          * the check for transfer complete.
1623                          *
1624                          * Technically this ought not be needed assuming we
1625                          * get a DATA_COMPLETE eventually (we'll notice the
1626                          * error and end the request), but it shouldn't hurt.
1627                          *
1628                          * This has the advantage of sending the stop command.
1629                          */
1630                         if (test_and_clear_bit(EVENT_DATA_ERROR,
1631                                                &host->pending_events)) {
1632                                 dw_mci_stop_dma(host);
1633                                 if (data->stop ||
1634                                     !(host->data_status & (SDMMC_INT_DRTO |
1635                                                            SDMMC_INT_EBE)))
1636                                         send_stop_abort(host, data);
1637                                 state = STATE_DATA_ERROR;
1638                                 break;
1639                         }
1640                         prev_state = state = STATE_DATA_BUSY;
1641 
1642                         /* fall through */
1643 
1644                 case STATE_DATA_BUSY:
1645                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1646                                                 &host->pending_events))
1647                                 break;
1648 
1649                         host->data = NULL;
1650                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1651                         err = dw_mci_data_complete(host, data);
1652 
1653                         if (!err) {
1654                                 if (!data->stop || mrq->sbc) {
1655                                         if (mrq->sbc && data->stop)
1656                                                 data->stop->error = 0;
1657                                         dw_mci_request_end(host, mrq);
1658                                         goto unlock;
1659                                 }
1660 
1661                                 /* stop command for open-ended transfer*/
1662                                 if (data->stop)
1663                                         send_stop_abort(host, data);
1664                         } else {
1665                                 /*
1666                                  * If we don't have a command complete now we'll
1667                                  * never get one since we just reset everything;
1668                                  * better end the request.
1669                                  *
1670                                  * If we do have a command complete we'll fall
1671                                  * through to the SENDING_STOP command and
1672                                  * everything will be peachy keen.
1673                                  */
1674                                 if (!test_bit(EVENT_CMD_COMPLETE,
1675                                               &host->pending_events)) {
1676                                         host->cmd = NULL;
1677                                         dw_mci_request_end(host, mrq);
1678                                         goto unlock;
1679                                 }
1680                         }
1681 
1682                         /*
1683                          * If err has non-zero,
1684                          * stop-abort command has been already issued.
1685                          */
1686                         prev_state = state = STATE_SENDING_STOP;
1687 
1688                         /* fall through */
1689 
1690                 case STATE_SENDING_STOP:
1691                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1692                                                 &host->pending_events))
1693                                 break;
1694 
1695                         /* CMD error in data command */
1696                         if (mrq->cmd->error && mrq->data)
1697                                 dw_mci_reset(host);
1698 
1699                         host->cmd = NULL;
1700                         host->data = NULL;
1701 
1702                         if (mrq->stop)
1703                                 dw_mci_command_complete(host, mrq->stop);
1704                         else
1705                                 host->cmd_status = 0;
1706 
1707                         dw_mci_request_end(host, mrq);
1708                         goto unlock;
1709 
1710                 case STATE_DATA_ERROR:
1711                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1712                                                 &host->pending_events))
1713                                 break;
1714 
1715                         state = STATE_DATA_BUSY;
1716                         break;
1717                 }
1718         } while (state != prev_state);
1719 
1720         host->state = state;
1721 unlock:
1722         spin_unlock(&host->lock);
1723 
1724 }
1725 
1726 /* push final bytes to part_buf, only use during push */
1727 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1728 {
1729         memcpy((void *)&host->part_buf, buf, cnt);
1730         host->part_buf_count = cnt;
1731 }
1732 
1733 /* append bytes to part_buf, only use during push */
1734 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1735 {
1736         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1737         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1738         host->part_buf_count += cnt;
1739         return cnt;
1740 }
1741 
1742 /* pull first bytes from part_buf, only use during pull */
1743 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1744 {
1745         cnt = min(cnt, (int)host->part_buf_count);
1746         if (cnt) {
1747                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1748                        cnt);
1749                 host->part_buf_count -= cnt;
1750                 host->part_buf_start += cnt;
1751         }
1752         return cnt;
1753 }
1754 
1755 /* pull final bytes from the part_buf, assuming it's just been filled */
1756 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1757 {
1758         memcpy(buf, &host->part_buf, cnt);
1759         host->part_buf_start = cnt;
1760         host->part_buf_count = (1 << host->data_shift) - cnt;
1761 }
1762 
1763 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1764 {
1765         struct mmc_data *data = host->data;
1766         int init_cnt = cnt;
1767 
1768         /* try and push anything in the part_buf */
1769         if (unlikely(host->part_buf_count)) {
1770                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1771                 buf += len;
1772                 cnt -= len;
1773                 if (host->part_buf_count == 2) {
1774                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
1775                         host->part_buf_count = 0;
1776                 }
1777         }
1778 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1779         if (unlikely((unsigned long)buf & 0x1)) {
1780                 while (cnt >= 2) {
1781                         u16 aligned_buf[64];
1782                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1783                         int items = len >> 1;
1784                         int i;
1785                         /* memcpy from input buffer into aligned buffer */
1786                         memcpy(aligned_buf, buf, len);
1787                         buf += len;
1788                         cnt -= len;
1789                         /* push data from aligned buffer into fifo */
1790                         for (i = 0; i < items; ++i)
1791                                 mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
1792                 }
1793         } else
1794 #endif
1795         {
1796                 u16 *pdata = buf;
1797                 for (; cnt >= 2; cnt -= 2)
1798                         mci_fifo_writew(host->fifo_reg, *pdata++);
1799                 buf = pdata;
1800         }
1801         /* put anything remaining in the part_buf */
1802         if (cnt) {
1803                 dw_mci_set_part_bytes(host, buf, cnt);
1804                  /* Push data if we have reached the expected data length */
1805                 if ((data->bytes_xfered + init_cnt) ==
1806                     (data->blksz * data->blocks))
1807                         mci_fifo_writew(host->fifo_reg, host->part_buf16);
1808         }
1809 }
1810 
1811 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1812 {
1813 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1814         if (unlikely((unsigned long)buf & 0x1)) {
1815                 while (cnt >= 2) {
1816                         /* pull data from fifo into aligned buffer */
1817                         u16 aligned_buf[64];
1818                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1819                         int items = len >> 1;
1820                         int i;
1821                         for (i = 0; i < items; ++i)
1822                                 aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
1823                         /* memcpy from aligned buffer into output buffer */
1824                         memcpy(buf, aligned_buf, len);
1825                         buf += len;
1826                         cnt -= len;
1827                 }
1828         } else
1829 #endif
1830         {
1831                 u16 *pdata = buf;
1832                 for (; cnt >= 2; cnt -= 2)
1833                         *pdata++ = mci_fifo_readw(host->fifo_reg);
1834                 buf = pdata;
1835         }
1836         if (cnt) {
1837                 host->part_buf16 = mci_fifo_readw(host->fifo_reg);
1838                 dw_mci_pull_final_bytes(host, buf, cnt);
1839         }
1840 }
1841 
1842 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1843 {
1844         struct mmc_data *data = host->data;
1845         int init_cnt = cnt;
1846 
1847         /* try and push anything in the part_buf */
1848         if (unlikely(host->part_buf_count)) {
1849                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1850                 buf += len;
1851                 cnt -= len;
1852                 if (host->part_buf_count == 4) {
1853                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
1854                         host->part_buf_count = 0;
1855                 }
1856         }
1857 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1858         if (unlikely((unsigned long)buf & 0x3)) {
1859                 while (cnt >= 4) {
1860                         u32 aligned_buf[32];
1861                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1862                         int items = len >> 2;
1863                         int i;
1864                         /* memcpy from input buffer into aligned buffer */
1865                         memcpy(aligned_buf, buf, len);
1866                         buf += len;
1867                         cnt -= len;
1868                         /* push data from aligned buffer into fifo */
1869                         for (i = 0; i < items; ++i)
1870                                 mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
1871                 }
1872         } else
1873 #endif
1874         {
1875                 u32 *pdata = buf;
1876                 for (; cnt >= 4; cnt -= 4)
1877                         mci_fifo_writel(host->fifo_reg, *pdata++);
1878                 buf = pdata;
1879         }
1880         /* put anything remaining in the part_buf */
1881         if (cnt) {
1882                 dw_mci_set_part_bytes(host, buf, cnt);
1883                  /* Push data if we have reached the expected data length */
1884                 if ((data->bytes_xfered + init_cnt) ==
1885                     (data->blksz * data->blocks))
1886                         mci_fifo_writel(host->fifo_reg, host->part_buf32);
1887         }
1888 }
1889 
1890 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1891 {
1892 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1893         if (unlikely((unsigned long)buf & 0x3)) {
1894                 while (cnt >= 4) {
1895                         /* pull data from fifo into aligned buffer */
1896                         u32 aligned_buf[32];
1897                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1898                         int items = len >> 2;
1899                         int i;
1900                         for (i = 0; i < items; ++i)
1901                                 aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
1902                         /* memcpy from aligned buffer into output buffer */
1903                         memcpy(buf, aligned_buf, len);
1904                         buf += len;
1905                         cnt -= len;
1906                 }
1907         } else
1908 #endif
1909         {
1910                 u32 *pdata = buf;
1911                 for (; cnt >= 4; cnt -= 4)
1912                         *pdata++ = mci_fifo_readl(host->fifo_reg);
1913                 buf = pdata;
1914         }
1915         if (cnt) {
1916                 host->part_buf32 = mci_fifo_readl(host->fifo_reg);
1917                 dw_mci_pull_final_bytes(host, buf, cnt);
1918         }
1919 }
1920 
1921 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1922 {
1923         struct mmc_data *data = host->data;
1924         int init_cnt = cnt;
1925 
1926         /* try and push anything in the part_buf */
1927         if (unlikely(host->part_buf_count)) {
1928                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1929                 buf += len;
1930                 cnt -= len;
1931 
1932                 if (host->part_buf_count == 8) {
1933                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
1934                         host->part_buf_count = 0;
1935                 }
1936         }
1937 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1938         if (unlikely((unsigned long)buf & 0x7)) {
1939                 while (cnt >= 8) {
1940                         u64 aligned_buf[16];
1941                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1942                         int items = len >> 3;
1943                         int i;
1944                         /* memcpy from input buffer into aligned buffer */
1945                         memcpy(aligned_buf, buf, len);
1946                         buf += len;
1947                         cnt -= len;
1948                         /* push data from aligned buffer into fifo */
1949                         for (i = 0; i < items; ++i)
1950                                 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
1951                 }
1952         } else
1953 #endif
1954         {
1955                 u64 *pdata = buf;
1956                 for (; cnt >= 8; cnt -= 8)
1957                         mci_fifo_writeq(host->fifo_reg, *pdata++);
1958                 buf = pdata;
1959         }
1960         /* put anything remaining in the part_buf */
1961         if (cnt) {
1962                 dw_mci_set_part_bytes(host, buf, cnt);
1963                 /* Push data if we have reached the expected data length */
1964                 if ((data->bytes_xfered + init_cnt) ==
1965                     (data->blksz * data->blocks))
1966                         mci_fifo_writeq(host->fifo_reg, host->part_buf);
1967         }
1968 }
1969 
1970 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1971 {
1972 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1973         if (unlikely((unsigned long)buf & 0x7)) {
1974                 while (cnt >= 8) {
1975                         /* pull data from fifo into aligned buffer */
1976                         u64 aligned_buf[16];
1977                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1978                         int items = len >> 3;
1979                         int i;
1980                         for (i = 0; i < items; ++i)
1981                                 aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
1982 
1983                         /* memcpy from aligned buffer into output buffer */
1984                         memcpy(buf, aligned_buf, len);
1985                         buf += len;
1986                         cnt -= len;
1987                 }
1988         } else
1989 #endif
1990         {
1991                 u64 *pdata = buf;
1992                 for (; cnt >= 8; cnt -= 8)
1993                         *pdata++ = mci_fifo_readq(host->fifo_reg);
1994                 buf = pdata;
1995         }
1996         if (cnt) {
1997                 host->part_buf = mci_fifo_readq(host->fifo_reg);
1998                 dw_mci_pull_final_bytes(host, buf, cnt);
1999         }
2000 }
2001 
2002 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
2003 {
2004         int len;
2005 
2006         /* get remaining partial bytes */
2007         len = dw_mci_pull_part_bytes(host, buf, cnt);
2008         if (unlikely(len == cnt))
2009                 return;
2010         buf += len;
2011         cnt -= len;
2012 
2013         /* get the rest of the data */
2014         host->pull_data(host, buf, cnt);
2015 }
2016 
2017 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
2018 {
2019         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2020         void *buf;
2021         unsigned int offset;
2022         struct mmc_data *data = host->data;
2023         int shift = host->data_shift;
2024         u32 status;
2025         unsigned int len;
2026         unsigned int remain, fcnt;
2027 
2028         do {
2029                 if (!sg_miter_next(sg_miter))
2030                         goto done;
2031 
2032                 host->sg = sg_miter->piter.sg;
2033                 buf = sg_miter->addr;
2034                 remain = sg_miter->length;
2035                 offset = 0;
2036 
2037                 do {
2038                         fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
2039                                         << shift) + host->part_buf_count;
2040                         len = min(remain, fcnt);
2041                         if (!len)
2042                                 break;
2043                         dw_mci_pull_data(host, (void *)(buf + offset), len);
2044                         data->bytes_xfered += len;
2045                         offset += len;
2046                         remain -= len;
2047                 } while (remain);
2048 
2049                 sg_miter->consumed = offset;
2050                 status = mci_readl(host, MINTSTS);
2051                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2052         /* if the RXDR is ready read again */
2053         } while ((status & SDMMC_INT_RXDR) ||
2054                  (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
2055 
2056         if (!remain) {
2057                 if (!sg_miter_next(sg_miter))
2058                         goto done;
2059                 sg_miter->consumed = 0;
2060         }
2061         sg_miter_stop(sg_miter);
2062         return;
2063 
2064 done:
2065         sg_miter_stop(sg_miter);
2066         host->sg = NULL;
2067         smp_wmb();
2068         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2069 }
2070 
2071 static void dw_mci_write_data_pio(struct dw_mci *host)
2072 {
2073         struct sg_mapping_iter *sg_miter = &host->sg_miter;
2074         void *buf;
2075         unsigned int offset;
2076         struct mmc_data *data = host->data;
2077         int shift = host->data_shift;
2078         u32 status;
2079         unsigned int len;
2080         unsigned int fifo_depth = host->fifo_depth;
2081         unsigned int remain, fcnt;
2082 
2083         do {
2084                 if (!sg_miter_next(sg_miter))
2085                         goto done;
2086 
2087                 host->sg = sg_miter->piter.sg;
2088                 buf = sg_miter->addr;
2089                 remain = sg_miter->length;
2090                 offset = 0;
2091 
2092                 do {
2093                         fcnt = ((fifo_depth -
2094                                  SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2095                                         << shift) - host->part_buf_count;
2096                         len = min(remain, fcnt);
2097                         if (!len)
2098                                 break;
2099                         host->push_data(host, (void *)(buf + offset), len);
2100                         data->bytes_xfered += len;
2101                         offset += len;
2102                         remain -= len;
2103                 } while (remain);
2104 
2105                 sg_miter->consumed = offset;
2106                 status = mci_readl(host, MINTSTS);
2107                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2108         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2109 
2110         if (!remain) {
2111                 if (!sg_miter_next(sg_miter))
2112                         goto done;
2113                 sg_miter->consumed = 0;
2114         }
2115         sg_miter_stop(sg_miter);
2116         return;
2117 
2118 done:
2119         sg_miter_stop(sg_miter);
2120         host->sg = NULL;
2121         smp_wmb();
2122         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2123 }
2124 
2125 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2126 {
2127         if (!host->cmd_status)
2128                 host->cmd_status = status;
2129 
2130         smp_wmb();
2131 
2132         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2133         tasklet_schedule(&host->tasklet);
2134 }
2135 
2136 static void dw_mci_handle_cd(struct dw_mci *host)
2137 {
2138         int i;
2139 
2140         for (i = 0; i < host->num_slots; i++) {
2141                 struct dw_mci_slot *slot = host->slot[i];
2142 
2143                 if (!slot)
2144                         continue;
2145 
2146                 if (slot->mmc->ops->card_event)
2147                         slot->mmc->ops->card_event(slot->mmc);
2148                 mmc_detect_change(slot->mmc,
2149                         msecs_to_jiffies(host->pdata->detect_delay_ms));
2150         }
2151 }
2152 
2153 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2154 {
2155         struct dw_mci *host = dev_id;
2156         u32 pending;
2157         int i;
2158 
2159         pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2160 
2161         /*
2162          * DTO fix - version 2.10a and below, and only if internal DMA
2163          * is configured.
2164          */
2165         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
2166                 if (!pending &&
2167                     ((mci_readl(host, STATUS) >> 17) & 0x1fff))
2168                         pending |= SDMMC_INT_DATA_OVER;
2169         }
2170 
2171         if (pending) {
2172                 /* Check volt switch first, since it can look like an error */
2173                 if ((host->state == STATE_SENDING_CMD11) &&
2174                     (pending & SDMMC_INT_VOLT_SWITCH)) {
2175                         unsigned long irqflags;
2176 
2177                         mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2178                         pending &= ~SDMMC_INT_VOLT_SWITCH;
2179 
2180                         /*
2181                          * Hold the lock; we know cmd11_timer can't be kicked
2182                          * off after the lock is released, so safe to delete.
2183                          */
2184                         spin_lock_irqsave(&host->irq_lock, irqflags);
2185                         dw_mci_cmd_interrupt(host, pending);
2186                         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2187 
2188                         del_timer(&host->cmd11_timer);
2189                 }
2190 
2191                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2192                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2193                         host->cmd_status = pending;
2194                         smp_wmb();
2195                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2196                 }
2197 
2198                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2199                         /* if there is an error report DATA_ERROR */
2200                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2201                         host->data_status = pending;
2202                         smp_wmb();
2203                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
2204                         tasklet_schedule(&host->tasklet);
2205                 }
2206 
2207                 if (pending & SDMMC_INT_DATA_OVER) {
2208                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2209                         if (!host->data_status)
2210                                 host->data_status = pending;
2211                         smp_wmb();
2212                         if (host->dir_status == DW_MCI_RECV_STATUS) {
2213                                 if (host->sg != NULL)
2214                                         dw_mci_read_data_pio(host, true);
2215                         }
2216                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2217                         tasklet_schedule(&host->tasklet);
2218                 }
2219 
2220                 if (pending & SDMMC_INT_RXDR) {
2221                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2222                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2223                                 dw_mci_read_data_pio(host, false);
2224                 }
2225 
2226                 if (pending & SDMMC_INT_TXDR) {
2227                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2228                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2229                                 dw_mci_write_data_pio(host);
2230                 }
2231 
2232                 if (pending & SDMMC_INT_CMD_DONE) {
2233                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2234                         dw_mci_cmd_interrupt(host, pending);
2235                 }
2236 
2237                 if (pending & SDMMC_INT_CD) {
2238                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
2239                         dw_mci_handle_cd(host);
2240                 }
2241 
2242                 /* Handle SDIO Interrupts */
2243                 for (i = 0; i < host->num_slots; i++) {
2244                         struct dw_mci_slot *slot = host->slot[i];
2245 
2246                         if (!slot)
2247                                 continue;
2248 
2249                         if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2250                                 mci_writel(host, RINTSTS,
2251                                            SDMMC_INT_SDIO(slot->sdio_id));
2252                                 mmc_signal_sdio_irq(slot->mmc);
2253                         }
2254                 }
2255 
2256         }
2257 
2258 #ifdef CONFIG_MMC_DW_IDMAC
2259         /* Handle DMA interrupts */
2260         if (host->dma_64bit_address == 1) {
2261                 pending = mci_readl(host, IDSTS64);
2262                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2263                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2264                                                         SDMMC_IDMAC_INT_RI);
2265                         mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2266                         host->dma_ops->complete(host);
2267                 }
2268         } else {
2269                 pending = mci_readl(host, IDSTS);
2270                 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2271                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2272                                                         SDMMC_IDMAC_INT_RI);
2273                         mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2274                         host->dma_ops->complete(host);
2275                 }
2276         }
2277 #endif
2278 
2279         return IRQ_HANDLED;
2280 }
2281 
2282 #ifdef CONFIG_OF
2283 /* given a slot id, find out the device node representing that slot */
2284 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
2285 {
2286         struct device_node *np;
2287         const __be32 *addr;
2288         int len;
2289 
2290         if (!dev || !dev->of_node)
2291                 return NULL;
2292 
2293         for_each_child_of_node(dev->of_node, np) {
2294                 addr = of_get_property(np, "reg", &len);
2295                 if (!addr || (len < sizeof(int)))
2296                         continue;
2297                 if (be32_to_cpup(addr) == slot)
2298                         return np;
2299         }
2300         return NULL;
2301 }
2302 
2303 static struct dw_mci_of_slot_quirks {
2304         char *quirk;
2305         int id;
2306 } of_slot_quirks[] = {
2307         {
2308                 .quirk  = "disable-wp",
2309                 .id     = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
2310         },
2311 };
2312 
2313 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2314 {
2315         struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2316         int quirks = 0;
2317         int idx;
2318 
2319         /* get quirks */
2320         for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
2321                 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL)) {
2322                         dev_warn(dev, "Slot quirk %s is deprecated\n",
2323                                         of_slot_quirks[idx].quirk);
2324                         quirks |= of_slot_quirks[idx].id;
2325                 }
2326 
2327         return quirks;
2328 }
2329 #else /* CONFIG_OF */
2330 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2331 {
2332         return 0;
2333 }
2334 #endif /* CONFIG_OF */
2335 
2336 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2337 {
2338         struct mmc_host *mmc;
2339         struct dw_mci_slot *slot;
2340         const struct dw_mci_drv_data *drv_data = host->drv_data;
2341         int ctrl_id, ret;
2342         u32 freq[2];
2343 
2344         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2345         if (!mmc)
2346                 return -ENOMEM;
2347 
2348         slot = mmc_priv(mmc);
2349         slot->id = id;
2350         slot->sdio_id = host->sdio_id0 + id;
2351         slot->mmc = mmc;
2352         slot->host = host;
2353         host->slot[id] = slot;
2354 
2355         slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
2356 
2357         mmc->ops = &dw_mci_ops;
2358         if (of_property_read_u32_array(host->dev->of_node,
2359                                        "clock-freq-min-max", freq, 2)) {
2360                 mmc->f_min = DW_MCI_FREQ_MIN;
2361                 mmc->f_max = DW_MCI_FREQ_MAX;
2362         } else {
2363                 mmc->f_min = freq[0];
2364                 mmc->f_max = freq[1];
2365         }
2366 
2367         /*if there are external regulators, get them*/
2368         ret = mmc_regulator_get_supply(mmc);
2369         if (ret == -EPROBE_DEFER)
2370                 goto err_host_allocated;
2371 
2372         if (!mmc->ocr_avail)
2373                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2374 
2375         if (host->pdata->caps)
2376                 mmc->caps = host->pdata->caps;
2377 
2378         if (host->pdata->pm_caps)
2379                 mmc->pm_caps = host->pdata->pm_caps;
2380 
2381         if (host->dev->of_node) {
2382                 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2383                 if (ctrl_id < 0)
2384                         ctrl_id = 0;
2385         } else {
2386                 ctrl_id = to_platform_device(host->dev)->id;
2387         }
2388         if (drv_data && drv_data->caps)
2389                 mmc->caps |= drv_data->caps[ctrl_id];
2390 
2391         if (host->pdata->caps2)
2392                 mmc->caps2 = host->pdata->caps2;
2393 
2394         ret = mmc_of_parse(mmc);
2395         if (ret)
2396                 goto err_host_allocated;
2397 
2398         if (host->pdata->blk_settings) {
2399                 mmc->max_segs = host->pdata->blk_settings->max_segs;
2400                 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
2401                 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
2402                 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
2403                 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
2404         } else {
2405                 /* Useful defaults if platform data is unset. */
2406 #ifdef CONFIG_MMC_DW_IDMAC
2407                 mmc->max_segs = host->ring_size;
2408                 mmc->max_blk_size = 65536;
2409                 mmc->max_seg_size = 0x1000;
2410                 mmc->max_req_size = mmc->max_seg_size * host->ring_size;
2411                 mmc->max_blk_count = mmc->max_req_size / 512;
2412 #else
2413                 mmc->max_segs = 64;
2414                 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
2415                 mmc->max_blk_count = 512;
2416                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2417                 mmc->max_seg_size = mmc->max_req_size;
2418 #endif /* CONFIG_MMC_DW_IDMAC */
2419         }
2420 
2421         if (dw_mci_get_cd(mmc))
2422                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2423         else
2424                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2425 
2426         ret = mmc_add_host(mmc);
2427         if (ret)
2428                 goto err_host_allocated;
2429 
2430 #if defined(CONFIG_DEBUG_FS)
2431         dw_mci_init_debugfs(slot);
2432 #endif
2433 
2434         return 0;
2435 
2436 err_host_allocated:
2437         mmc_free_host(mmc);
2438         return ret;
2439 }
2440 
2441 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2442 {
2443         /* Debugfs stuff is cleaned up by mmc core */
2444         mmc_remove_host(slot->mmc);
2445         slot->host->slot[id] = NULL;
2446         mmc_free_host(slot->mmc);
2447 }
2448 
2449 static void dw_mci_init_dma(struct dw_mci *host)
2450 {
2451         int addr_config;
2452         /* Check ADDR_CONFIG bit in HCON to find IDMAC address bus width */
2453         addr_config = (mci_readl(host, HCON) >> 27) & 0x01;
2454 
2455         if (addr_config == 1) {
2456                 /* host supports IDMAC in 64-bit address mode */
2457                 host->dma_64bit_address = 1;
2458                 dev_info(host->dev, "IDMAC supports 64-bit address mode.\n");
2459                 if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2460                         dma_set_coherent_mask(host->dev, DMA_BIT_MASK(64));
2461         } else {
2462                 /* host supports IDMAC in 32-bit address mode */
2463                 host->dma_64bit_address = 0;
2464                 dev_info(host->dev, "IDMAC supports 32-bit address mode.\n");
2465         }
2466 
2467         /* Alloc memory for sg translation */
2468         host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2469                                           &host->sg_dma, GFP_KERNEL);
2470         if (!host->sg_cpu) {
2471                 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2472                         __func__);
2473                 goto no_dma;
2474         }
2475 
2476         /* Determine which DMA interface to use */
2477 #ifdef CONFIG_MMC_DW_IDMAC
2478         host->dma_ops = &dw_mci_idmac_ops;
2479         dev_info(host->dev, "Using internal DMA controller.\n");
2480 #endif
2481 
2482         if (!host->dma_ops)
2483                 goto no_dma;
2484 
2485         if (host->dma_ops->init && host->dma_ops->start &&
2486             host->dma_ops->stop && host->dma_ops->cleanup) {
2487                 if (host->dma_ops->init(host)) {
2488                         dev_err(host->dev, "%s: Unable to initialize "
2489                                 "DMA Controller.\n", __func__);
2490                         goto no_dma;
2491                 }
2492         } else {
2493                 dev_err(host->dev, "DMA initialization not found.\n");
2494                 goto no_dma;
2495         }
2496 
2497         host->use_dma = 1;
2498         return;
2499 
2500 no_dma:
2501         dev_info(host->dev, "Using PIO mode.\n");
2502         host->use_dma = 0;
2503         return;
2504 }
2505 
2506 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2507 {
2508         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2509         u32 ctrl;
2510 
2511         ctrl = mci_readl(host, CTRL);
2512         ctrl |= reset;
2513         mci_writel(host, CTRL, ctrl);
2514 
2515         /* wait till resets clear */
2516         do {
2517                 ctrl = mci_readl(host, CTRL);
2518                 if (!(ctrl & reset))
2519                         return true;
2520         } while (time_before(jiffies, timeout));
2521 
2522         dev_err(host->dev,
2523                 "Timeout resetting block (ctrl reset %#x)\n",
2524                 ctrl & reset);
2525 
2526         return false;
2527 }
2528 
2529 static bool dw_mci_reset(struct dw_mci *host)
2530 {
2531         u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2532         bool ret = false;
2533 
2534         /*
2535          * Reseting generates a block interrupt, hence setting
2536          * the scatter-gather pointer to NULL.
2537          */
2538         if (host->sg) {
2539                 sg_miter_stop(&host->sg_miter);
2540                 host->sg = NULL;
2541         }
2542 
2543         if (host->use_dma)
2544                 flags |= SDMMC_CTRL_DMA_RESET;
2545 
2546         if (dw_mci_ctrl_reset(host, flags)) {
2547                 /*
2548                  * In all cases we clear the RAWINTS register to clear any
2549                  * interrupts.
2550                  */
2551                 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2552 
2553                 /* if using dma we wait for dma_req to clear */
2554                 if (host->use_dma) {
2555                         unsigned long timeout = jiffies + msecs_to_jiffies(500);
2556                         u32 status;
2557                         do {
2558                                 status = mci_readl(host, STATUS);
2559                                 if (!(status & SDMMC_STATUS_DMA_REQ))
2560                                         break;
2561                                 cpu_relax();
2562                         } while (time_before(jiffies, timeout));
2563 
2564                         if (status & SDMMC_STATUS_DMA_REQ) {
2565                                 dev_err(host->dev,
2566                                         "%s: Timeout waiting for dma_req to "
2567                                         "clear during reset\n", __func__);
2568                                 goto ciu_out;
2569                         }
2570 
2571                         /* when using DMA next we reset the fifo again */
2572                         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2573                                 goto ciu_out;
2574                 }
2575         } else {
2576                 /* if the controller reset bit did clear, then set clock regs */
2577                 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2578                         dev_err(host->dev, "%s: fifo/dma reset bits didn't "
2579                                 "clear but ciu was reset, doing clock update\n",
2580                                 __func__);
2581                         goto ciu_out;
2582                 }
2583         }
2584 
2585 #if IS_ENABLED(CONFIG_MMC_DW_IDMAC)
2586         /* It is also recommended that we reset and reprogram idmac */
2587         dw_mci_idmac_reset(host);
2588 #endif
2589 
2590         ret = true;
2591 
2592 ciu_out:
2593         /* After a CTRL reset we need to have CIU set clock registers  */
2594         mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2595 
2596         return ret;
2597 }
2598 
2599 static void dw_mci_cmd11_timer(unsigned long arg)
2600 {
2601         struct dw_mci *host = (struct dw_mci *)arg;
2602 
2603         if (host->state != STATE_SENDING_CMD11) {
2604                 dev_warn(host->dev, "Unexpected CMD11 timeout\n");
2605                 return;
2606         }
2607 
2608         host->cmd_status = SDMMC_INT_RTO;
2609         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2610         tasklet_schedule(&host->tasklet);
2611 }
2612 
2613 #ifdef CONFIG_OF
2614 static struct dw_mci_of_quirks {
2615         char *quirk;
2616         int id;
2617 } of_quirks[] = {
2618         {
2619                 .quirk  = "broken-cd",
2620                 .id     = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2621         }, {
2622                 .quirk  = "disable-wp",
2623                 .id     = DW_MCI_QUIRK_NO_WRITE_PROTECT,
2624         },
2625 };
2626 
2627 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2628 {
2629         struct dw_mci_board *pdata;
2630         struct device *dev = host->dev;
2631         struct device_node *np = dev->of_node;
2632         const struct dw_mci_drv_data *drv_data = host->drv_data;
2633         int idx, ret;
2634         u32 clock_frequency;
2635 
2636         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2637         if (!pdata)
2638                 return ERR_PTR(-ENOMEM);
2639 
2640         /* find out number of slots supported */
2641         if (of_property_read_u32(dev->of_node, "num-slots",
2642                                 &pdata->num_slots)) {
2643                 dev_info(dev, "num-slots property not found, "
2644                                 "assuming 1 slot is available\n");
2645                 pdata->num_slots = 1;
2646         }
2647 
2648         /* get quirks */
2649         for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2650                 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2651                         pdata->quirks |= of_quirks[idx].id;
2652 
2653         if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2654                 dev_info(dev, "fifo-depth property not found, using "
2655                                 "value of FIFOTH register as default\n");
2656 
2657         of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2658 
2659         if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2660                 pdata->bus_hz = clock_frequency;
2661 
2662         if (drv_data && drv_data->parse_dt) {
2663                 ret = drv_data->parse_dt(host);
2664                 if (ret)
2665                         return ERR_PTR(ret);
2666         }
2667 
2668         if (of_find_property(np, "supports-highspeed", NULL))
2669                 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2670 
2671         return pdata;
2672 }
2673 
2674 #else /* CONFIG_OF */
2675 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2676 {
2677         return ERR_PTR(-EINVAL);
2678 }
2679 #endif /* CONFIG_OF */
2680 
2681 static void dw_mci_enable_cd(struct dw_mci *host)
2682 {
2683         struct dw_mci_board *brd = host->pdata;
2684         unsigned long irqflags;
2685         u32 temp;
2686         int i;
2687 
2688         /* No need for CD if broken card detection */
2689         if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
2690                 return;
2691 
2692         /* No need for CD if all slots have a non-error GPIO */
2693         for (i = 0; i < host->num_slots; i++) {
2694                 struct dw_mci_slot *slot = host->slot[i];
2695 
2696                 if (IS_ERR_VALUE(mmc_gpio_get_cd(slot->mmc)))
2697                         break;
2698         }
2699         if (i == host->num_slots)
2700                 return;
2701 
2702         spin_lock_irqsave(&host->irq_lock, irqflags);
2703         temp = mci_readl(host, INTMASK);
2704         temp  |= SDMMC_INT_CD;
2705         mci_writel(host, INTMASK, temp);
2706         spin_unlock_irqrestore(&host->irq_lock, irqflags);
2707 }
2708 
2709 int dw_mci_probe(struct dw_mci *host)
2710 {
2711         const struct dw_mci_drv_data *drv_data = host->drv_data;
2712         int width, i, ret = 0;
2713         u32 fifo_size;
2714         int init_slots = 0;
2715 
2716         if (!host->pdata) {
2717                 host->pdata = dw_mci_parse_dt(host);
2718                 if (IS_ERR(host->pdata)) {
2719                         dev_err(host->dev, "platform data not available\n");
2720                         return -EINVAL;
2721                 }
2722         }
2723 
2724         if (host->pdata->num_slots > 1) {
2725                 dev_err(host->dev,
2726                         "Platform data must supply num_slots.\n");
2727                 return -ENODEV;
2728         }
2729 
2730         host->biu_clk = devm_clk_get(host->dev, "biu");
2731         if (IS_ERR(host->biu_clk)) {
2732                 dev_dbg(host->dev, "biu clock not available\n");
2733         } else {
2734                 ret = clk_prepare_enable(host->biu_clk);
2735                 if (ret) {
2736                         dev_err(host->dev, "failed to enable biu clock\n");
2737                         return ret;
2738                 }
2739         }
2740 
2741         host->ciu_clk = devm_clk_get(host->dev, "ciu");
2742         if (IS_ERR(host->ciu_clk)) {
2743                 dev_dbg(host->dev, "ciu clock not available\n");
2744                 host->bus_hz = host->pdata->bus_hz;
2745         } else {
2746                 ret = clk_prepare_enable(host->ciu_clk);
2747                 if (ret) {
2748                         dev_err(host->dev, "failed to enable ciu clock\n");
2749                         goto err_clk_biu;
2750                 }
2751 
2752                 if (host->pdata->bus_hz) {
2753                         ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2754                         if (ret)
2755                                 dev_warn(host->dev,
2756                                          "Unable to set bus rate to %uHz\n",
2757                                          host->pdata->bus_hz);
2758                 }
2759                 host->bus_hz = clk_get_rate(host->ciu_clk);
2760         }
2761 
2762         if (!host->bus_hz) {
2763                 dev_err(host->dev,
2764                         "Platform data must supply bus speed\n");
2765                 ret = -ENODEV;
2766                 goto err_clk_ciu;
2767         }
2768 
2769         if (drv_data && drv_data->init) {
2770                 ret = drv_data->init(host);
2771                 if (ret) {
2772                         dev_err(host->dev,
2773                                 "implementation specific init failed\n");
2774                         goto err_clk_ciu;
2775                 }
2776         }
2777 
2778         if (drv_data && drv_data->setup_clock) {
2779                 ret = drv_data->setup_clock(host);
2780                 if (ret) {
2781                         dev_err(host->dev,
2782                                 "implementation specific clock setup failed\n");
2783                         goto err_clk_ciu;
2784                 }
2785         }
2786 
2787         setup_timer(&host->cmd11_timer,
2788                     dw_mci_cmd11_timer, (unsigned long)host);
2789 
2790         host->quirks = host->pdata->quirks;
2791 
2792         spin_lock_init(&host->lock);
2793         spin_lock_init(&host->irq_lock);
2794         INIT_LIST_HEAD(&host->queue);
2795 
2796         /*
2797          * Get the host data width - this assumes that HCON has been set with
2798          * the correct values.
2799          */
2800         i = (mci_readl(host, HCON) >> 7) & 0x7;
2801         if (!i) {
2802                 host->push_data = dw_mci_push_data16;
2803                 host->pull_data = dw_mci_pull_data16;
2804                 width = 16;
2805                 host->data_shift = 1;
2806         } else if (i == 2) {
2807                 host->push_data = dw_mci_push_data64;
2808                 host->pull_data = dw_mci_pull_data64;
2809                 width = 64;
2810                 host->data_shift = 3;
2811         } else {
2812                 /* Check for a reserved value, and warn if it is */
2813                 WARN((i != 1),
2814                      "HCON reports a reserved host data width!\n"
2815                      "Defaulting to 32-bit access.\n");
2816                 host->push_data = dw_mci_push_data32;
2817                 host->pull_data = dw_mci_pull_data32;
2818                 width = 32;
2819                 host->data_shift = 2;
2820         }
2821 
2822         /* Reset all blocks */
2823         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS))
2824                 return -ENODEV;
2825 
2826         host->dma_ops = host->pdata->dma_ops;
2827         dw_mci_init_dma(host);
2828 
2829         /* Clear the interrupts for the host controller */
2830         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2831         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2832 
2833         /* Put in max timeout */
2834         mci_writel(host, TMOUT, 0xFFFFFFFF);
2835 
2836         /*
2837          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
2838          *                          Tx Mark = fifo_size / 2 DMA Size = 8
2839          */
2840         if (!host->pdata->fifo_depth) {
2841                 /*
2842                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2843                  * have been overwritten by the bootloader, just like we're
2844                  * about to do, so if you know the value for your hardware, you
2845                  * should put it in the platform data.
2846                  */
2847                 fifo_size = mci_readl(host, FIFOTH);
2848                 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2849         } else {
2850                 fifo_size = host->pdata->fifo_depth;
2851         }
2852         host->fifo_depth = fifo_size;
2853         host->fifoth_val =
2854                 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
2855         mci_writel(host, FIFOTH, host->fifoth_val);
2856 
2857         /* disable clock to CIU */
2858         mci_writel(host, CLKENA, 0);
2859         mci_writel(host, CLKSRC, 0);
2860 
2861         /*
2862          * In 2.40a spec, Data offset is changed.
2863          * Need to check the version-id and set data-offset for DATA register.
2864          */
2865         host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2866         dev_info(host->dev, "Version ID is %04x\n", host->verid);
2867 
2868         if (host->verid < DW_MMC_240A)
2869                 host->fifo_reg = host->regs + DATA_OFFSET;
2870         else
2871                 host->fifo_reg = host->regs + DATA_240A_OFFSET;
2872 
2873         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2874         ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2875                                host->irq_flags, "dw-mci", host);
2876         if (ret)
2877                 goto err_dmaunmap;
2878 
2879         if (host->pdata->num_slots)
2880                 host->num_slots = host->pdata->num_slots;
2881         else
2882                 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2883 
2884         /*
2885          * Enable interrupts for command done, data over, data empty,
2886          * receive ready and error such as transmit, receive timeout, crc error
2887          */
2888         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2889         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2890                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2891                    DW_MCI_ERROR_FLAGS);
2892         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2893 
2894         dev_info(host->dev, "DW MMC controller at irq %d, "
2895                  "%d bit host data width, "
2896                  "%u deep fifo\n",
2897                  host->irq, width, fifo_size);
2898 
2899         /* We need at least one slot to succeed */
2900         for (i = 0; i < host->num_slots; i++) {
2901                 ret = dw_mci_init_slot(host, i);
2902                 if (ret)
2903                         dev_dbg(host->dev, "slot %d init failed\n", i);
2904                 else
2905                         init_slots++;
2906         }
2907 
2908         if (init_slots) {
2909                 dev_info(host->dev, "%d slots initialized\n", init_slots);
2910         } else {
2911                 dev_dbg(host->dev, "attempted to initialize %d slots, "
2912                                         "but failed on all\n", host->num_slots);
2913                 goto err_dmaunmap;
2914         }
2915 
2916         /* Now that slots are all setup, we can enable card detect */
2917         dw_mci_enable_cd(host);
2918 
2919         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2920                 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2921 
2922         return 0;
2923 
2924 err_dmaunmap:
2925         if (host->use_dma && host->dma_ops->exit)
2926                 host->dma_ops->exit(host);
2927 
2928 err_clk_ciu:
2929         if (!IS_ERR(host->ciu_clk))
2930                 clk_disable_unprepare(host->ciu_clk);
2931 
2932 err_clk_biu:
2933         if (!IS_ERR(host->biu_clk))
2934                 clk_disable_unprepare(host->biu_clk);
2935 
2936         return ret;
2937 }
2938 EXPORT_SYMBOL(dw_mci_probe);
2939 
2940 void dw_mci_remove(struct dw_mci *host)
2941 {
2942         int i;
2943 
2944         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2945         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2946 
2947         for (i = 0; i < host->num_slots; i++) {
2948                 dev_dbg(host->dev, "remove slot %d\n", i);
2949                 if (host->slot[i])
2950                         dw_mci_cleanup_slot(host->slot[i], i);
2951         }
2952 
2953         /* disable clock to CIU */
2954         mci_writel(host, CLKENA, 0);
2955         mci_writel(host, CLKSRC, 0);
2956 
2957         if (host->use_dma && host->dma_ops->exit)
2958                 host->dma_ops->exit(host);
2959 
2960         if (!IS_ERR(host->ciu_clk))
2961                 clk_disable_unprepare(host->ciu_clk);
2962 
2963         if (!IS_ERR(host->biu_clk))
2964                 clk_disable_unprepare(host->biu_clk);
2965 }
2966 EXPORT_SYMBOL(dw_mci_remove);
2967 
2968 
2969 
2970 #ifdef CONFIG_PM_SLEEP
2971 /*
2972  * TODO: we should probably disable the clock to the card in the suspend path.
2973  */
2974 int dw_mci_suspend(struct dw_mci *host)
2975 {
2976         return 0;
2977 }
2978 EXPORT_SYMBOL(dw_mci_suspend);
2979 
2980 int dw_mci_resume(struct dw_mci *host)
2981 {
2982         int i, ret;
2983 
2984         if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
2985                 ret = -ENODEV;
2986                 return ret;
2987         }
2988 
2989         if (host->use_dma && host->dma_ops->init)
2990                 host->dma_ops->init(host);
2991 
2992         /*
2993          * Restore the initial value at FIFOTH register
2994          * And Invalidate the prev_blksz with zero
2995          */
2996         mci_writel(host, FIFOTH, host->fifoth_val);
2997         host->prev_blksz = 0;
2998 
2999         /* Put in max timeout */
3000         mci_writel(host, TMOUT, 0xFFFFFFFF);
3001 
3002         mci_writel(host, RINTSTS, 0xFFFFFFFF);
3003         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
3004                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
3005                    DW_MCI_ERROR_FLAGS);
3006         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
3007 
3008         for (i = 0; i < host->num_slots; i++) {
3009                 struct dw_mci_slot *slot = host->slot[i];
3010                 if (!slot)
3011                         continue;
3012                 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
3013                         dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
3014                         dw_mci_setup_bus(slot, true);
3015                 }
3016         }
3017 
3018         /* Now that slots are all setup, we can enable card detect */
3019         dw_mci_enable_cd(host);
3020 
3021         return 0;
3022 }
3023 EXPORT_SYMBOL(dw_mci_resume);
3024 #endif /* CONFIG_PM_SLEEP */
3025 
3026 static int __init dw_mci_init(void)
3027 {
3028         pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
3029         return 0;
3030 }
3031 
3032 static void __exit dw_mci_exit(void)
3033 {
3034 }
3035 
3036 module_init(dw_mci_init);
3037 module_exit(dw_mci_exit);
3038 
3039 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
3040 MODULE_AUTHOR("NXP Semiconductor VietNam");
3041 MODULE_AUTHOR("Imagination Technologies Ltd");
3042 MODULE_LICENSE("GPL v2");
3043 

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