77f0b6b1681ddc8ba74658a06a4aa8ad62276053
[linux-2.6.git] / 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/scatterlist.h>
26 #include <linux/seq_file.h>
27 #include <linux/slab.h>
28 #include <linux/stat.h>
29 #include <linux/delay.h>
30 #include <linux/irq.h>
31 #include <linux/mmc/host.h>
32 #include <linux/mmc/mmc.h>
33 #include <linux/mmc/dw_mmc.h>
34 #include <linux/bitops.h>
35 #include <linux/regulator/consumer.h>
36 #include <linux/workqueue.h>
37
38 #include "dw_mmc.h"
39
40 /* Common flag combinations */
41 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
42                                  SDMMC_INT_HTO | SDMMC_INT_SBE  | \
43                                  SDMMC_INT_EBE)
44 #define DW_MCI_CMD_ERROR_FLAGS  (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
45                                  SDMMC_INT_RESP_ERR)
46 #define DW_MCI_ERROR_FLAGS      (DW_MCI_DATA_ERROR_FLAGS | \
47                                  DW_MCI_CMD_ERROR_FLAGS  | SDMMC_INT_HLE)
48 #define DW_MCI_SEND_STATUS      1
49 #define DW_MCI_RECV_STATUS      2
50 #define DW_MCI_DMA_THRESHOLD    16
51
52 #ifdef CONFIG_MMC_DW_IDMAC
53 struct idmac_desc {
54         u32             des0;   /* Control Descriptor */
55 #define IDMAC_DES0_DIC  BIT(1)
56 #define IDMAC_DES0_LD   BIT(2)
57 #define IDMAC_DES0_FD   BIT(3)
58 #define IDMAC_DES0_CH   BIT(4)
59 #define IDMAC_DES0_ER   BIT(5)
60 #define IDMAC_DES0_CES  BIT(30)
61 #define IDMAC_DES0_OWN  BIT(31)
62
63         u32             des1;   /* Buffer sizes */
64 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
65         ((d)->des1 = ((d)->des1 & 0x03ffc000) | ((s) & 0x3fff))
66
67         u32             des2;   /* buffer 1 physical address */
68
69         u32             des3;   /* buffer 2 physical address */
70 };
71 #endif /* CONFIG_MMC_DW_IDMAC */
72
73 /**
74  * struct dw_mci_slot - MMC slot state
75  * @mmc: The mmc_host representing this slot.
76  * @host: The MMC controller this slot is using.
77  * @ctype: Card type for this slot.
78  * @mrq: mmc_request currently being processed or waiting to be
79  *      processed, or NULL when the slot is idle.
80  * @queue_node: List node for placing this node in the @queue list of
81  *      &struct dw_mci.
82  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
83  * @flags: Random state bits associated with the slot.
84  * @id: Number of this slot.
85  * @last_detect_state: Most recently observed card detect state.
86  */
87 struct dw_mci_slot {
88         struct mmc_host         *mmc;
89         struct dw_mci           *host;
90
91         u32                     ctype;
92
93         struct mmc_request      *mrq;
94         struct list_head        queue_node;
95
96         unsigned int            clock;
97         unsigned long           flags;
98 #define DW_MMC_CARD_PRESENT     0
99 #define DW_MMC_CARD_NEED_INIT   1
100         int                     id;
101         int                     last_detect_state;
102 };
103
104 static struct workqueue_struct *dw_mci_card_workqueue;
105
106 #if defined(CONFIG_DEBUG_FS)
107 static int dw_mci_req_show(struct seq_file *s, void *v)
108 {
109         struct dw_mci_slot *slot = s->private;
110         struct mmc_request *mrq;
111         struct mmc_command *cmd;
112         struct mmc_command *stop;
113         struct mmc_data *data;
114
115         /* Make sure we get a consistent snapshot */
116         spin_lock_bh(&slot->host->lock);
117         mrq = slot->mrq;
118
119         if (mrq) {
120                 cmd = mrq->cmd;
121                 data = mrq->data;
122                 stop = mrq->stop;
123
124                 if (cmd)
125                         seq_printf(s,
126                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
127                                    cmd->opcode, cmd->arg, cmd->flags,
128                                    cmd->resp[0], cmd->resp[1], cmd->resp[2],
129                                    cmd->resp[2], cmd->error);
130                 if (data)
131                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
132                                    data->bytes_xfered, data->blocks,
133                                    data->blksz, data->flags, data->error);
134                 if (stop)
135                         seq_printf(s,
136                                    "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
137                                    stop->opcode, stop->arg, stop->flags,
138                                    stop->resp[0], stop->resp[1], stop->resp[2],
139                                    stop->resp[2], stop->error);
140         }
141
142         spin_unlock_bh(&slot->host->lock);
143
144         return 0;
145 }
146
147 static int dw_mci_req_open(struct inode *inode, struct file *file)
148 {
149         return single_open(file, dw_mci_req_show, inode->i_private);
150 }
151
152 static const struct file_operations dw_mci_req_fops = {
153         .owner          = THIS_MODULE,
154         .open           = dw_mci_req_open,
155         .read           = seq_read,
156         .llseek         = seq_lseek,
157         .release        = single_release,
158 };
159
160 static int dw_mci_regs_show(struct seq_file *s, void *v)
161 {
162         seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
163         seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
164         seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
165         seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
166         seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
167         seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
168
169         return 0;
170 }
171
172 static int dw_mci_regs_open(struct inode *inode, struct file *file)
173 {
174         return single_open(file, dw_mci_regs_show, inode->i_private);
175 }
176
177 static const struct file_operations dw_mci_regs_fops = {
178         .owner          = THIS_MODULE,
179         .open           = dw_mci_regs_open,
180         .read           = seq_read,
181         .llseek         = seq_lseek,
182         .release        = single_release,
183 };
184
185 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
186 {
187         struct mmc_host *mmc = slot->mmc;
188         struct dw_mci *host = slot->host;
189         struct dentry *root;
190         struct dentry *node;
191
192         root = mmc->debugfs_root;
193         if (!root)
194                 return;
195
196         node = debugfs_create_file("regs", S_IRUSR, root, host,
197                                    &dw_mci_regs_fops);
198         if (!node)
199                 goto err;
200
201         node = debugfs_create_file("req", S_IRUSR, root, slot,
202                                    &dw_mci_req_fops);
203         if (!node)
204                 goto err;
205
206         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
207         if (!node)
208                 goto err;
209
210         node = debugfs_create_x32("pending_events", S_IRUSR, root,
211                                   (u32 *)&host->pending_events);
212         if (!node)
213                 goto err;
214
215         node = debugfs_create_x32("completed_events", S_IRUSR, root,
216                                   (u32 *)&host->completed_events);
217         if (!node)
218                 goto err;
219
220         return;
221
222 err:
223         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
224 }
225 #endif /* defined(CONFIG_DEBUG_FS) */
226
227 static void dw_mci_set_timeout(struct dw_mci *host)
228 {
229         /* timeout (maximum) */
230         mci_writel(host, TMOUT, 0xffffffff);
231 }
232
233 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
234 {
235         struct mmc_data *data;
236         u32 cmdr;
237         cmd->error = -EINPROGRESS;
238
239         cmdr = cmd->opcode;
240
241         if (cmdr == MMC_STOP_TRANSMISSION)
242                 cmdr |= SDMMC_CMD_STOP;
243         else
244                 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
245
246         if (cmd->flags & MMC_RSP_PRESENT) {
247                 /* We expect a response, so set this bit */
248                 cmdr |= SDMMC_CMD_RESP_EXP;
249                 if (cmd->flags & MMC_RSP_136)
250                         cmdr |= SDMMC_CMD_RESP_LONG;
251         }
252
253         if (cmd->flags & MMC_RSP_CRC)
254                 cmdr |= SDMMC_CMD_RESP_CRC;
255
256         data = cmd->data;
257         if (data) {
258                 cmdr |= SDMMC_CMD_DAT_EXP;
259                 if (data->flags & MMC_DATA_STREAM)
260                         cmdr |= SDMMC_CMD_STRM_MODE;
261                 if (data->flags & MMC_DATA_WRITE)
262                         cmdr |= SDMMC_CMD_DAT_WR;
263         }
264
265         return cmdr;
266 }
267
268 static void dw_mci_start_command(struct dw_mci *host,
269                                  struct mmc_command *cmd, u32 cmd_flags)
270 {
271         host->cmd = cmd;
272         dev_vdbg(&host->pdev->dev,
273                  "start command: ARGR=0x%08x CMDR=0x%08x\n",
274                  cmd->arg, cmd_flags);
275
276         mci_writel(host, CMDARG, cmd->arg);
277         wmb();
278
279         mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
280 }
281
282 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
283 {
284         dw_mci_start_command(host, data->stop, host->stop_cmdr);
285 }
286
287 /* DMA interface functions */
288 static void dw_mci_stop_dma(struct dw_mci *host)
289 {
290         if (host->using_dma) {
291                 host->dma_ops->stop(host);
292                 host->dma_ops->cleanup(host);
293         } else {
294                 /* Data transfer was stopped by the interrupt handler */
295                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
296         }
297 }
298
299 #ifdef CONFIG_MMC_DW_IDMAC
300 static void dw_mci_dma_cleanup(struct dw_mci *host)
301 {
302         struct mmc_data *data = host->data;
303
304         if (data)
305                 dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
306                              ((data->flags & MMC_DATA_WRITE)
307                               ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
308 }
309
310 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
311 {
312         u32 temp;
313
314         /* Disable and reset the IDMAC interface */
315         temp = mci_readl(host, CTRL);
316         temp &= ~SDMMC_CTRL_USE_IDMAC;
317         temp |= SDMMC_CTRL_DMA_RESET;
318         mci_writel(host, CTRL, temp);
319
320         /* Stop the IDMAC running */
321         temp = mci_readl(host, BMOD);
322         temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
323         mci_writel(host, BMOD, temp);
324 }
325
326 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
327 {
328         struct mmc_data *data = host->data;
329
330         dev_vdbg(&host->pdev->dev, "DMA complete\n");
331
332         host->dma_ops->cleanup(host);
333
334         /*
335          * If the card was removed, data will be NULL. No point in trying to
336          * send the stop command or waiting for NBUSY in this case.
337          */
338         if (data) {
339                 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
340                 tasklet_schedule(&host->tasklet);
341         }
342 }
343
344 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
345                                     unsigned int sg_len)
346 {
347         int i;
348         struct idmac_desc *desc = host->sg_cpu;
349
350         for (i = 0; i < sg_len; i++, desc++) {
351                 unsigned int length = sg_dma_len(&data->sg[i]);
352                 u32 mem_addr = sg_dma_address(&data->sg[i]);
353
354                 /* Set the OWN bit and disable interrupts for this descriptor */
355                 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
356
357                 /* Buffer length */
358                 IDMAC_SET_BUFFER1_SIZE(desc, length);
359
360                 /* Physical address to DMA to/from */
361                 desc->des2 = mem_addr;
362         }
363
364         /* Set first descriptor */
365         desc = host->sg_cpu;
366         desc->des0 |= IDMAC_DES0_FD;
367
368         /* Set last descriptor */
369         desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
370         desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
371         desc->des0 |= IDMAC_DES0_LD;
372
373         wmb();
374 }
375
376 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
377 {
378         u32 temp;
379
380         dw_mci_translate_sglist(host, host->data, sg_len);
381
382         /* Select IDMAC interface */
383         temp = mci_readl(host, CTRL);
384         temp |= SDMMC_CTRL_USE_IDMAC;
385         mci_writel(host, CTRL, temp);
386
387         wmb();
388
389         /* Enable the IDMAC */
390         temp = mci_readl(host, BMOD);
391         temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
392         mci_writel(host, BMOD, temp);
393
394         /* Start it running */
395         mci_writel(host, PLDMND, 1);
396 }
397
398 static int dw_mci_idmac_init(struct dw_mci *host)
399 {
400         struct idmac_desc *p;
401         int i;
402
403         /* Number of descriptors in the ring buffer */
404         host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
405
406         /* Forward link the descriptor list */
407         for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
408                 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
409
410         /* Set the last descriptor as the end-of-ring descriptor */
411         p->des3 = host->sg_dma;
412         p->des0 = IDMAC_DES0_ER;
413
414         /* Mask out interrupts - get Tx & Rx complete only */
415         mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
416                    SDMMC_IDMAC_INT_TI);
417
418         /* Set the descriptor base address */
419         mci_writel(host, DBADDR, host->sg_dma);
420         return 0;
421 }
422
423 static struct dw_mci_dma_ops dw_mci_idmac_ops = {
424         .init = dw_mci_idmac_init,
425         .start = dw_mci_idmac_start_dma,
426         .stop = dw_mci_idmac_stop_dma,
427         .complete = dw_mci_idmac_complete_dma,
428         .cleanup = dw_mci_dma_cleanup,
429 };
430 #endif /* CONFIG_MMC_DW_IDMAC */
431
432 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
433 {
434         struct scatterlist *sg;
435         unsigned int i, direction, sg_len;
436         u32 temp;
437
438         host->using_dma = 0;
439
440         /* If we don't have a channel, we can't do DMA */
441         if (!host->use_dma)
442                 return -ENODEV;
443
444         /*
445          * We don't do DMA on "complex" transfers, i.e. with
446          * non-word-aligned buffers or lengths. Also, we don't bother
447          * with all the DMA setup overhead for short transfers.
448          */
449         if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
450                 return -EINVAL;
451         if (data->blksz & 3)
452                 return -EINVAL;
453
454         for_each_sg(data->sg, sg, data->sg_len, i) {
455                 if (sg->offset & 3 || sg->length & 3)
456                         return -EINVAL;
457         }
458
459         host->using_dma = 1;
460
461         if (data->flags & MMC_DATA_READ)
462                 direction = DMA_FROM_DEVICE;
463         else
464                 direction = DMA_TO_DEVICE;
465
466         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
467                             direction);
468
469         dev_vdbg(&host->pdev->dev,
470                  "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
471                  (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
472                  sg_len);
473
474         /* Enable the DMA interface */
475         temp = mci_readl(host, CTRL);
476         temp |= SDMMC_CTRL_DMA_ENABLE;
477         mci_writel(host, CTRL, temp);
478
479         /* Disable RX/TX IRQs, let DMA handle it */
480         temp = mci_readl(host, INTMASK);
481         temp  &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
482         mci_writel(host, INTMASK, temp);
483
484         host->dma_ops->start(host, sg_len);
485
486         return 0;
487 }
488
489 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
490 {
491         u32 temp;
492
493         data->error = -EINPROGRESS;
494
495         WARN_ON(host->data);
496         host->sg = NULL;
497         host->data = data;
498
499         if (data->flags & MMC_DATA_READ)
500                 host->dir_status = DW_MCI_RECV_STATUS;
501         else
502                 host->dir_status = DW_MCI_SEND_STATUS;
503
504         if (dw_mci_submit_data_dma(host, data)) {
505                 host->sg = data->sg;
506                 host->pio_offset = 0;
507                 host->part_buf_start = 0;
508                 host->part_buf_count = 0;
509
510                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
511                 temp = mci_readl(host, INTMASK);
512                 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
513                 mci_writel(host, INTMASK, temp);
514
515                 temp = mci_readl(host, CTRL);
516                 temp &= ~SDMMC_CTRL_DMA_ENABLE;
517                 mci_writel(host, CTRL, temp);
518         }
519 }
520
521 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
522 {
523         struct dw_mci *host = slot->host;
524         unsigned long timeout = jiffies + msecs_to_jiffies(500);
525         unsigned int cmd_status = 0;
526
527         mci_writel(host, CMDARG, arg);
528         wmb();
529         mci_writel(host, CMD, SDMMC_CMD_START | cmd);
530
531         while (time_before(jiffies, timeout)) {
532                 cmd_status = mci_readl(host, CMD);
533                 if (!(cmd_status & SDMMC_CMD_START))
534                         return;
535         }
536         dev_err(&slot->mmc->class_dev,
537                 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
538                 cmd, arg, cmd_status);
539 }
540
541 static void dw_mci_setup_bus(struct dw_mci_slot *slot)
542 {
543         struct dw_mci *host = slot->host;
544         u32 div;
545
546         if (slot->clock != host->current_speed) {
547                 if (host->bus_hz % slot->clock)
548                         /*
549                          * move the + 1 after the divide to prevent
550                          * over-clocking the card.
551                          */
552                         div = ((host->bus_hz / slot->clock) >> 1) + 1;
553                 else
554                         div = (host->bus_hz  / slot->clock) >> 1;
555
556                 dev_info(&slot->mmc->class_dev,
557                          "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
558                          " div = %d)\n", slot->id, host->bus_hz, slot->clock,
559                          div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
560
561                 /* disable clock */
562                 mci_writel(host, CLKENA, 0);
563                 mci_writel(host, CLKSRC, 0);
564
565                 /* inform CIU */
566                 mci_send_cmd(slot,
567                              SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
568
569                 /* set clock to desired speed */
570                 mci_writel(host, CLKDIV, div);
571
572                 /* inform CIU */
573                 mci_send_cmd(slot,
574                              SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
575
576                 /* enable clock */
577                 mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE |
578                            SDMMC_CLKEN_LOW_PWR);
579
580                 /* inform CIU */
581                 mci_send_cmd(slot,
582                              SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
583
584                 host->current_speed = slot->clock;
585         }
586
587         /* Set the current slot bus width */
588         mci_writel(host, CTYPE, (slot->ctype << slot->id));
589 }
590
591 static void dw_mci_start_request(struct dw_mci *host,
592                                  struct dw_mci_slot *slot)
593 {
594         struct mmc_request *mrq;
595         struct mmc_command *cmd;
596         struct mmc_data *data;
597         u32 cmdflags;
598
599         mrq = slot->mrq;
600         if (host->pdata->select_slot)
601                 host->pdata->select_slot(slot->id);
602
603         /* Slot specific timing and width adjustment */
604         dw_mci_setup_bus(slot);
605
606         host->cur_slot = slot;
607         host->mrq = mrq;
608
609         host->pending_events = 0;
610         host->completed_events = 0;
611         host->data_status = 0;
612
613         data = mrq->data;
614         if (data) {
615                 dw_mci_set_timeout(host);
616                 mci_writel(host, BYTCNT, data->blksz*data->blocks);
617                 mci_writel(host, BLKSIZ, data->blksz);
618         }
619
620         cmd = mrq->cmd;
621         cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
622
623         /* this is the first command, send the initialization clock */
624         if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
625                 cmdflags |= SDMMC_CMD_INIT;
626
627         if (data) {
628                 dw_mci_submit_data(host, data);
629                 wmb();
630         }
631
632         dw_mci_start_command(host, cmd, cmdflags);
633
634         if (mrq->stop)
635                 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
636 }
637
638 /* must be called with host->lock held */
639 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
640                                  struct mmc_request *mrq)
641 {
642         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
643                  host->state);
644
645         slot->mrq = mrq;
646
647         if (host->state == STATE_IDLE) {
648                 host->state = STATE_SENDING_CMD;
649                 dw_mci_start_request(host, slot);
650         } else {
651                 list_add_tail(&slot->queue_node, &host->queue);
652         }
653 }
654
655 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
656 {
657         struct dw_mci_slot *slot = mmc_priv(mmc);
658         struct dw_mci *host = slot->host;
659
660         WARN_ON(slot->mrq);
661
662         /*
663          * The check for card presence and queueing of the request must be
664          * atomic, otherwise the card could be removed in between and the
665          * request wouldn't fail until another card was inserted.
666          */
667         spin_lock_bh(&host->lock);
668
669         if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
670                 spin_unlock_bh(&host->lock);
671                 mrq->cmd->error = -ENOMEDIUM;
672                 mmc_request_done(mmc, mrq);
673                 return;
674         }
675
676         dw_mci_queue_request(host, slot, mrq);
677
678         spin_unlock_bh(&host->lock);
679 }
680
681 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
682 {
683         struct dw_mci_slot *slot = mmc_priv(mmc);
684         u32 regs;
685
686         /* set default 1 bit mode */
687         slot->ctype = SDMMC_CTYPE_1BIT;
688
689         switch (ios->bus_width) {
690         case MMC_BUS_WIDTH_1:
691                 slot->ctype = SDMMC_CTYPE_1BIT;
692                 break;
693         case MMC_BUS_WIDTH_4:
694                 slot->ctype = SDMMC_CTYPE_4BIT;
695                 break;
696         case MMC_BUS_WIDTH_8:
697                 slot->ctype = SDMMC_CTYPE_8BIT;
698                 break;
699         }
700
701         /* DDR mode set */
702         if (ios->ddr) {
703                 regs = mci_readl(slot->host, UHS_REG);
704                 regs |= (0x1 << slot->id) << 16;
705                 mci_writel(slot->host, UHS_REG, regs);
706         }
707
708         if (ios->clock) {
709                 /*
710                  * Use mirror of ios->clock to prevent race with mmc
711                  * core ios update when finding the minimum.
712                  */
713                 slot->clock = ios->clock;
714         }
715
716         switch (ios->power_mode) {
717         case MMC_POWER_UP:
718                 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
719                 break;
720         default:
721                 break;
722         }
723 }
724
725 static int dw_mci_get_ro(struct mmc_host *mmc)
726 {
727         int read_only;
728         struct dw_mci_slot *slot = mmc_priv(mmc);
729         struct dw_mci_board *brd = slot->host->pdata;
730
731         /* Use platform get_ro function, else try on board write protect */
732         if (brd->get_ro)
733                 read_only = brd->get_ro(slot->id);
734         else
735                 read_only =
736                         mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
737
738         dev_dbg(&mmc->class_dev, "card is %s\n",
739                 read_only ? "read-only" : "read-write");
740
741         return read_only;
742 }
743
744 static int dw_mci_get_cd(struct mmc_host *mmc)
745 {
746         int present;
747         struct dw_mci_slot *slot = mmc_priv(mmc);
748         struct dw_mci_board *brd = slot->host->pdata;
749
750         /* Use platform get_cd function, else try onboard card detect */
751         if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
752                 present = 1;
753         else if (brd->get_cd)
754                 present = !brd->get_cd(slot->id);
755         else
756                 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
757                         == 0 ? 1 : 0;
758
759         if (present)
760                 dev_dbg(&mmc->class_dev, "card is present\n");
761         else
762                 dev_dbg(&mmc->class_dev, "card is not present\n");
763
764         return present;
765 }
766
767 static const struct mmc_host_ops dw_mci_ops = {
768         .request        = dw_mci_request,
769         .set_ios        = dw_mci_set_ios,
770         .get_ro         = dw_mci_get_ro,
771         .get_cd         = dw_mci_get_cd,
772 };
773
774 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
775         __releases(&host->lock)
776         __acquires(&host->lock)
777 {
778         struct dw_mci_slot *slot;
779         struct mmc_host *prev_mmc = host->cur_slot->mmc;
780
781         WARN_ON(host->cmd || host->data);
782
783         host->cur_slot->mrq = NULL;
784         host->mrq = NULL;
785         if (!list_empty(&host->queue)) {
786                 slot = list_entry(host->queue.next,
787                                   struct dw_mci_slot, queue_node);
788                 list_del(&slot->queue_node);
789                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
790                          mmc_hostname(slot->mmc));
791                 host->state = STATE_SENDING_CMD;
792                 dw_mci_start_request(host, slot);
793         } else {
794                 dev_vdbg(&host->pdev->dev, "list empty\n");
795                 host->state = STATE_IDLE;
796         }
797
798         spin_unlock(&host->lock);
799         mmc_request_done(prev_mmc, mrq);
800         spin_lock(&host->lock);
801 }
802
803 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
804 {
805         u32 status = host->cmd_status;
806
807         host->cmd_status = 0;
808
809         /* Read the response from the card (up to 16 bytes) */
810         if (cmd->flags & MMC_RSP_PRESENT) {
811                 if (cmd->flags & MMC_RSP_136) {
812                         cmd->resp[3] = mci_readl(host, RESP0);
813                         cmd->resp[2] = mci_readl(host, RESP1);
814                         cmd->resp[1] = mci_readl(host, RESP2);
815                         cmd->resp[0] = mci_readl(host, RESP3);
816                 } else {
817                         cmd->resp[0] = mci_readl(host, RESP0);
818                         cmd->resp[1] = 0;
819                         cmd->resp[2] = 0;
820                         cmd->resp[3] = 0;
821                 }
822         }
823
824         if (status & SDMMC_INT_RTO)
825                 cmd->error = -ETIMEDOUT;
826         else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
827                 cmd->error = -EILSEQ;
828         else if (status & SDMMC_INT_RESP_ERR)
829                 cmd->error = -EIO;
830         else
831                 cmd->error = 0;
832
833         if (cmd->error) {
834                 /* newer ip versions need a delay between retries */
835                 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
836                         mdelay(20);
837
838                 if (cmd->data) {
839                         host->data = NULL;
840                         dw_mci_stop_dma(host);
841                 }
842         }
843 }
844
845 static void dw_mci_tasklet_func(unsigned long priv)
846 {
847         struct dw_mci *host = (struct dw_mci *)priv;
848         struct mmc_data *data;
849         struct mmc_command *cmd;
850         enum dw_mci_state state;
851         enum dw_mci_state prev_state;
852         u32 status, ctrl;
853
854         spin_lock(&host->lock);
855
856         state = host->state;
857         data = host->data;
858
859         do {
860                 prev_state = state;
861
862                 switch (state) {
863                 case STATE_IDLE:
864                         break;
865
866                 case STATE_SENDING_CMD:
867                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
868                                                 &host->pending_events))
869                                 break;
870
871                         cmd = host->cmd;
872                         host->cmd = NULL;
873                         set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
874                         dw_mci_command_complete(host, host->mrq->cmd);
875                         if (!host->mrq->data || cmd->error) {
876                                 dw_mci_request_end(host, host->mrq);
877                                 goto unlock;
878                         }
879
880                         prev_state = state = STATE_SENDING_DATA;
881                         /* fall through */
882
883                 case STATE_SENDING_DATA:
884                         if (test_and_clear_bit(EVENT_DATA_ERROR,
885                                                &host->pending_events)) {
886                                 dw_mci_stop_dma(host);
887                                 if (data->stop)
888                                         send_stop_cmd(host, data);
889                                 state = STATE_DATA_ERROR;
890                                 break;
891                         }
892
893                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
894                                                 &host->pending_events))
895                                 break;
896
897                         set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
898                         prev_state = state = STATE_DATA_BUSY;
899                         /* fall through */
900
901                 case STATE_DATA_BUSY:
902                         if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
903                                                 &host->pending_events))
904                                 break;
905
906                         host->data = NULL;
907                         set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
908                         status = host->data_status;
909
910                         if (status & DW_MCI_DATA_ERROR_FLAGS) {
911                                 if (status & SDMMC_INT_DTO) {
912                                         data->error = -ETIMEDOUT;
913                                 } else if (status & SDMMC_INT_DCRC) {
914                                         data->error = -EILSEQ;
915                                 } else if (status & SDMMC_INT_EBE &&
916                                            host->dir_status ==
917                                                         DW_MCI_SEND_STATUS) {
918                                         /*
919                                          * No data CRC status was returned.
920                                          * The number of bytes transferred will
921                                          * be exaggerated in PIO mode.
922                                          */
923                                         data->bytes_xfered = 0;
924                                         data->error = -ETIMEDOUT;
925                                 } else {
926                                         dev_err(&host->pdev->dev,
927                                                 "data FIFO error "
928                                                 "(status=%08x)\n",
929                                                 status);
930                                         data->error = -EIO;
931                                 }
932                                 /*
933                                  * After an error, there may be data lingering
934                                  * in the FIFO, so reset it - doing so
935                                  * generates a block interrupt, hence setting
936                                  * the scatter-gather pointer to NULL.
937                                  */
938                                 host->sg = NULL;
939                                 ctrl = mci_readl(host, CTRL);
940                                 ctrl |= SDMMC_CTRL_FIFO_RESET;
941                                 mci_writel(host, CTRL, ctrl);
942                         } else {
943                                 data->bytes_xfered = data->blocks * data->blksz;
944                                 data->error = 0;
945                         }
946
947                         if (!data->stop) {
948                                 dw_mci_request_end(host, host->mrq);
949                                 goto unlock;
950                         }
951
952                         prev_state = state = STATE_SENDING_STOP;
953                         if (!data->error)
954                                 send_stop_cmd(host, data);
955                         /* fall through */
956
957                 case STATE_SENDING_STOP:
958                         if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
959                                                 &host->pending_events))
960                                 break;
961
962                         host->cmd = NULL;
963                         dw_mci_command_complete(host, host->mrq->stop);
964                         dw_mci_request_end(host, host->mrq);
965                         goto unlock;
966
967                 case STATE_DATA_ERROR:
968                         if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
969                                                 &host->pending_events))
970                                 break;
971
972                         state = STATE_DATA_BUSY;
973                         break;
974                 }
975         } while (state != prev_state);
976
977         host->state = state;
978 unlock:
979         spin_unlock(&host->lock);
980
981 }
982
983 /* push final bytes to part_buf, only use during push */
984 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
985 {
986         memcpy((void *)&host->part_buf, buf, cnt);
987         host->part_buf_count = cnt;
988 }
989
990 /* append bytes to part_buf, only use during push */
991 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
992 {
993         cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
994         memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
995         host->part_buf_count += cnt;
996         return cnt;
997 }
998
999 /* pull first bytes from part_buf, only use during pull */
1000 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1001 {
1002         cnt = min(cnt, (int)host->part_buf_count);
1003         if (cnt) {
1004                 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1005                        cnt);
1006                 host->part_buf_count -= cnt;
1007                 host->part_buf_start += cnt;
1008         }
1009         return cnt;
1010 }
1011
1012 /* pull final bytes from the part_buf, assuming it's just been filled */
1013 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1014 {
1015         memcpy(buf, &host->part_buf, cnt);
1016         host->part_buf_start = cnt;
1017         host->part_buf_count = (1 << host->data_shift) - cnt;
1018 }
1019
1020 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1021 {
1022         /* try and push anything in the part_buf */
1023         if (unlikely(host->part_buf_count)) {
1024                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1025                 buf += len;
1026                 cnt -= len;
1027                 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1028                         mci_writew(host, DATA, host->part_buf16);
1029                         host->part_buf_count = 0;
1030                 }
1031         }
1032 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1033         if (unlikely((unsigned long)buf & 0x1)) {
1034                 while (cnt >= 2) {
1035                         u16 aligned_buf[64];
1036                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1037                         int items = len >> 1;
1038                         int i;
1039                         /* memcpy from input buffer into aligned buffer */
1040                         memcpy(aligned_buf, buf, len);
1041                         buf += len;
1042                         cnt -= len;
1043                         /* push data from aligned buffer into fifo */
1044                         for (i = 0; i < items; ++i)
1045                                 mci_writew(host, DATA, aligned_buf[i]);
1046                 }
1047         } else
1048 #endif
1049         {
1050                 u16 *pdata = buf;
1051                 for (; cnt >= 2; cnt -= 2)
1052                         mci_writew(host, DATA, *pdata++);
1053                 buf = pdata;
1054         }
1055         /* put anything remaining in the part_buf */
1056         if (cnt) {
1057                 dw_mci_set_part_bytes(host, buf, cnt);
1058                 if (!sg_next(host->sg))
1059                         mci_writew(host, DATA, host->part_buf16);
1060         }
1061 }
1062
1063 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1064 {
1065 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1066         if (unlikely((unsigned long)buf & 0x1)) {
1067                 while (cnt >= 2) {
1068                         /* pull data from fifo into aligned buffer */
1069                         u16 aligned_buf[64];
1070                         int len = min(cnt & -2, (int)sizeof(aligned_buf));
1071                         int items = len >> 1;
1072                         int i;
1073                         for (i = 0; i < items; ++i)
1074                                 aligned_buf[i] = mci_readw(host, DATA);
1075                         /* memcpy from aligned buffer into output buffer */
1076                         memcpy(buf, aligned_buf, len);
1077                         buf += len;
1078                         cnt -= len;
1079                 }
1080         } else
1081 #endif
1082         {
1083                 u16 *pdata = buf;
1084                 for (; cnt >= 2; cnt -= 2)
1085                         *pdata++ = mci_readw(host, DATA);
1086                 buf = pdata;
1087         }
1088         if (cnt) {
1089                 host->part_buf16 = mci_readw(host, DATA);
1090                 dw_mci_pull_final_bytes(host, buf, cnt);
1091         }
1092 }
1093
1094 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1095 {
1096         /* try and push anything in the part_buf */
1097         if (unlikely(host->part_buf_count)) {
1098                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1099                 buf += len;
1100                 cnt -= len;
1101                 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1102                         mci_writel(host, DATA, host->part_buf32);
1103                         host->part_buf_count = 0;
1104                 }
1105         }
1106 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1107         if (unlikely((unsigned long)buf & 0x3)) {
1108                 while (cnt >= 4) {
1109                         u32 aligned_buf[32];
1110                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1111                         int items = len >> 2;
1112                         int i;
1113                         /* memcpy from input buffer into aligned buffer */
1114                         memcpy(aligned_buf, buf, len);
1115                         buf += len;
1116                         cnt -= len;
1117                         /* push data from aligned buffer into fifo */
1118                         for (i = 0; i < items; ++i)
1119                                 mci_writel(host, DATA, aligned_buf[i]);
1120                 }
1121         } else
1122 #endif
1123         {
1124                 u32 *pdata = buf;
1125                 for (; cnt >= 4; cnt -= 4)
1126                         mci_writel(host, DATA, *pdata++);
1127                 buf = pdata;
1128         }
1129         /* put anything remaining in the part_buf */
1130         if (cnt) {
1131                 dw_mci_set_part_bytes(host, buf, cnt);
1132                 if (!sg_next(host->sg))
1133                         mci_writel(host, DATA, host->part_buf32);
1134         }
1135 }
1136
1137 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1138 {
1139 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1140         if (unlikely((unsigned long)buf & 0x3)) {
1141                 while (cnt >= 4) {
1142                         /* pull data from fifo into aligned buffer */
1143                         u32 aligned_buf[32];
1144                         int len = min(cnt & -4, (int)sizeof(aligned_buf));
1145                         int items = len >> 2;
1146                         int i;
1147                         for (i = 0; i < items; ++i)
1148                                 aligned_buf[i] = mci_readl(host, DATA);
1149                         /* memcpy from aligned buffer into output buffer */
1150                         memcpy(buf, aligned_buf, len);
1151                         buf += len;
1152                         cnt -= len;
1153                 }
1154         } else
1155 #endif
1156         {
1157                 u32 *pdata = buf;
1158                 for (; cnt >= 4; cnt -= 4)
1159                         *pdata++ = mci_readl(host, DATA);
1160                 buf = pdata;
1161         }
1162         if (cnt) {
1163                 host->part_buf32 = mci_readl(host, DATA);
1164                 dw_mci_pull_final_bytes(host, buf, cnt);
1165         }
1166 }
1167
1168 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1169 {
1170         /* try and push anything in the part_buf */
1171         if (unlikely(host->part_buf_count)) {
1172                 int len = dw_mci_push_part_bytes(host, buf, cnt);
1173                 buf += len;
1174                 cnt -= len;
1175                 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1176                         mci_writew(host, DATA, host->part_buf);
1177                         host->part_buf_count = 0;
1178                 }
1179         }
1180 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1181         if (unlikely((unsigned long)buf & 0x7)) {
1182                 while (cnt >= 8) {
1183                         u64 aligned_buf[16];
1184                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1185                         int items = len >> 3;
1186                         int i;
1187                         /* memcpy from input buffer into aligned buffer */
1188                         memcpy(aligned_buf, buf, len);
1189                         buf += len;
1190                         cnt -= len;
1191                         /* push data from aligned buffer into fifo */
1192                         for (i = 0; i < items; ++i)
1193                                 mci_writeq(host, DATA, aligned_buf[i]);
1194                 }
1195         } else
1196 #endif
1197         {
1198                 u64 *pdata = buf;
1199                 for (; cnt >= 8; cnt -= 8)
1200                         mci_writeq(host, DATA, *pdata++);
1201                 buf = pdata;
1202         }
1203         /* put anything remaining in the part_buf */
1204         if (cnt) {
1205                 dw_mci_set_part_bytes(host, buf, cnt);
1206                 if (!sg_next(host->sg))
1207                         mci_writeq(host, DATA, host->part_buf);
1208         }
1209 }
1210
1211 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1212 {
1213 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1214         if (unlikely((unsigned long)buf & 0x7)) {
1215                 while (cnt >= 8) {
1216                         /* pull data from fifo into aligned buffer */
1217                         u64 aligned_buf[16];
1218                         int len = min(cnt & -8, (int)sizeof(aligned_buf));
1219                         int items = len >> 3;
1220                         int i;
1221                         for (i = 0; i < items; ++i)
1222                                 aligned_buf[i] = mci_readq(host, DATA);
1223                         /* memcpy from aligned buffer into output buffer */
1224                         memcpy(buf, aligned_buf, len);
1225                         buf += len;
1226                         cnt -= len;
1227                 }
1228         } else
1229 #endif
1230         {
1231                 u64 *pdata = buf;
1232                 for (; cnt >= 8; cnt -= 8)
1233                         *pdata++ = mci_readq(host, DATA);
1234                 buf = pdata;
1235         }
1236         if (cnt) {
1237                 host->part_buf = mci_readq(host, DATA);
1238                 dw_mci_pull_final_bytes(host, buf, cnt);
1239         }
1240 }
1241
1242 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1243 {
1244         int len;
1245
1246         /* get remaining partial bytes */
1247         len = dw_mci_pull_part_bytes(host, buf, cnt);
1248         if (unlikely(len == cnt))
1249                 return;
1250         buf += len;
1251         cnt -= len;
1252
1253         /* get the rest of the data */
1254         host->pull_data(host, buf, cnt);
1255 }
1256
1257 static void dw_mci_read_data_pio(struct dw_mci *host)
1258 {
1259         struct scatterlist *sg = host->sg;
1260         void *buf = sg_virt(sg);
1261         unsigned int offset = host->pio_offset;
1262         struct mmc_data *data = host->data;
1263         int shift = host->data_shift;
1264         u32 status;
1265         unsigned int nbytes = 0, len;
1266
1267         do {
1268                 len = host->part_buf_count +
1269                         (SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
1270                 if (offset + len <= sg->length) {
1271                         dw_mci_pull_data(host, (void *)(buf + offset), len);
1272
1273                         offset += len;
1274                         nbytes += len;
1275
1276                         if (offset == sg->length) {
1277                                 flush_dcache_page(sg_page(sg));
1278                                 host->sg = sg = sg_next(sg);
1279                                 if (!sg)
1280                                         goto done;
1281
1282                                 offset = 0;
1283                                 buf = sg_virt(sg);
1284                         }
1285                 } else {
1286                         unsigned int remaining = sg->length - offset;
1287                         dw_mci_pull_data(host, (void *)(buf + offset),
1288                                          remaining);
1289                         nbytes += remaining;
1290
1291                         flush_dcache_page(sg_page(sg));
1292                         host->sg = sg = sg_next(sg);
1293                         if (!sg)
1294                                 goto done;
1295
1296                         offset = len - remaining;
1297                         buf = sg_virt(sg);
1298                         dw_mci_pull_data(host, buf, offset);
1299                         nbytes += offset;
1300                 }
1301
1302                 status = mci_readl(host, MINTSTS);
1303                 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1304                 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1305                         host->data_status = status;
1306                         data->bytes_xfered += nbytes;
1307                         smp_wmb();
1308
1309                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
1310
1311                         tasklet_schedule(&host->tasklet);
1312                         return;
1313                 }
1314         } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1315         host->pio_offset = offset;
1316         data->bytes_xfered += nbytes;
1317         return;
1318
1319 done:
1320         data->bytes_xfered += nbytes;
1321         smp_wmb();
1322         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1323 }
1324
1325 static void dw_mci_write_data_pio(struct dw_mci *host)
1326 {
1327         struct scatterlist *sg = host->sg;
1328         void *buf = sg_virt(sg);
1329         unsigned int offset = host->pio_offset;
1330         struct mmc_data *data = host->data;
1331         int shift = host->data_shift;
1332         u32 status;
1333         unsigned int nbytes = 0, len;
1334
1335         do {
1336                 len = ((host->fifo_depth -
1337                         SDMMC_GET_FCNT(mci_readl(host, STATUS))) << shift)
1338                         - host->part_buf_count;
1339                 if (offset + len <= sg->length) {
1340                         host->push_data(host, (void *)(buf + offset), len);
1341
1342                         offset += len;
1343                         nbytes += len;
1344                         if (offset == sg->length) {
1345                                 host->sg = sg = sg_next(sg);
1346                                 if (!sg)
1347                                         goto done;
1348
1349                                 offset = 0;
1350                                 buf = sg_virt(sg);
1351                         }
1352                 } else {
1353                         unsigned int remaining = sg->length - offset;
1354
1355                         host->push_data(host, (void *)(buf + offset),
1356                                         remaining);
1357                         nbytes += remaining;
1358
1359                         host->sg = sg = sg_next(sg);
1360                         if (!sg)
1361                                 goto done;
1362
1363                         offset = len - remaining;
1364                         buf = sg_virt(sg);
1365                         host->push_data(host, (void *)buf, offset);
1366                         nbytes += offset;
1367                 }
1368
1369                 status = mci_readl(host, MINTSTS);
1370                 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1371                 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1372                         host->data_status = status;
1373                         data->bytes_xfered += nbytes;
1374
1375                         smp_wmb();
1376
1377                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
1378
1379                         tasklet_schedule(&host->tasklet);
1380                         return;
1381                 }
1382         } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1383         host->pio_offset = offset;
1384         data->bytes_xfered += nbytes;
1385         return;
1386
1387 done:
1388         data->bytes_xfered += nbytes;
1389         smp_wmb();
1390         set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1391 }
1392
1393 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1394 {
1395         if (!host->cmd_status)
1396                 host->cmd_status = status;
1397
1398         smp_wmb();
1399
1400         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1401         tasklet_schedule(&host->tasklet);
1402 }
1403
1404 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1405 {
1406         struct dw_mci *host = dev_id;
1407         u32 status, pending;
1408         unsigned int pass_count = 0;
1409
1410         do {
1411                 status = mci_readl(host, RINTSTS);
1412                 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1413
1414                 /*
1415                  * DTO fix - version 2.10a and below, and only if internal DMA
1416                  * is configured.
1417                  */
1418                 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1419                         if (!pending &&
1420                             ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1421                                 pending |= SDMMC_INT_DATA_OVER;
1422                 }
1423
1424                 if (!pending)
1425                         break;
1426
1427                 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1428                         mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1429                         host->cmd_status = status;
1430                         smp_wmb();
1431                         set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1432                 }
1433
1434                 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1435                         /* if there is an error report DATA_ERROR */
1436                         mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1437                         host->data_status = status;
1438                         smp_wmb();
1439                         set_bit(EVENT_DATA_ERROR, &host->pending_events);
1440                         if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
1441                                          SDMMC_INT_SBE | SDMMC_INT_EBE)))
1442                                 tasklet_schedule(&host->tasklet);
1443                 }
1444
1445                 if (pending & SDMMC_INT_DATA_OVER) {
1446                         mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1447                         if (!host->data_status)
1448                                 host->data_status = status;
1449                         smp_wmb();
1450                         if (host->dir_status == DW_MCI_RECV_STATUS) {
1451                                 if (host->sg != NULL)
1452                                         dw_mci_read_data_pio(host);
1453                         }
1454                         set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1455                         tasklet_schedule(&host->tasklet);
1456                 }
1457
1458                 if (pending & SDMMC_INT_RXDR) {
1459                         mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1460                         if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1461                                 dw_mci_read_data_pio(host);
1462                 }
1463
1464                 if (pending & SDMMC_INT_TXDR) {
1465                         mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1466                         if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1467                                 dw_mci_write_data_pio(host);
1468                 }
1469
1470                 if (pending & SDMMC_INT_CMD_DONE) {
1471                         mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1472                         dw_mci_cmd_interrupt(host, status);
1473                 }
1474
1475                 if (pending & SDMMC_INT_CD) {
1476                         mci_writel(host, RINTSTS, SDMMC_INT_CD);
1477                         queue_work(dw_mci_card_workqueue, &host->card_work);
1478                 }
1479
1480         } while (pass_count++ < 5);
1481
1482 #ifdef CONFIG_MMC_DW_IDMAC
1483         /* Handle DMA interrupts */
1484         pending = mci_readl(host, IDSTS);
1485         if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1486                 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1487                 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1488                 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1489                 host->dma_ops->complete(host);
1490         }
1491 #endif
1492
1493         return IRQ_HANDLED;
1494 }
1495
1496 static void dw_mci_work_routine_card(struct work_struct *work)
1497 {
1498         struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1499         int i;
1500
1501         for (i = 0; i < host->num_slots; i++) {
1502                 struct dw_mci_slot *slot = host->slot[i];
1503                 struct mmc_host *mmc = slot->mmc;
1504                 struct mmc_request *mrq;
1505                 int present;
1506                 u32 ctrl;
1507
1508                 present = dw_mci_get_cd(mmc);
1509                 while (present != slot->last_detect_state) {
1510                         dev_dbg(&slot->mmc->class_dev, "card %s\n",
1511                                 present ? "inserted" : "removed");
1512
1513                         /* Power up slot (before spin_lock, may sleep) */
1514                         if (present != 0 && host->pdata->setpower)
1515                                 host->pdata->setpower(slot->id, mmc->ocr_avail);
1516
1517                         spin_lock_bh(&host->lock);
1518
1519                         /* Card change detected */
1520                         slot->last_detect_state = present;
1521
1522                         /* Mark card as present if applicable */
1523                         if (present != 0)
1524                                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1525
1526                         /* Clean up queue if present */
1527                         mrq = slot->mrq;
1528                         if (mrq) {
1529                                 if (mrq == host->mrq) {
1530                                         host->data = NULL;
1531                                         host->cmd = NULL;
1532
1533                                         switch (host->state) {
1534                                         case STATE_IDLE:
1535                                                 break;
1536                                         case STATE_SENDING_CMD:
1537                                                 mrq->cmd->error = -ENOMEDIUM;
1538                                                 if (!mrq->data)
1539                                                         break;
1540                                                 /* fall through */
1541                                         case STATE_SENDING_DATA:
1542                                                 mrq->data->error = -ENOMEDIUM;
1543                                                 dw_mci_stop_dma(host);
1544                                                 break;
1545                                         case STATE_DATA_BUSY:
1546                                         case STATE_DATA_ERROR:
1547                                                 if (mrq->data->error == -EINPROGRESS)
1548                                                         mrq->data->error = -ENOMEDIUM;
1549                                                 if (!mrq->stop)
1550                                                         break;
1551                                                 /* fall through */
1552                                         case STATE_SENDING_STOP:
1553                                                 mrq->stop->error = -ENOMEDIUM;
1554                                                 break;
1555                                         }
1556
1557                                         dw_mci_request_end(host, mrq);
1558                                 } else {
1559                                         list_del(&slot->queue_node);
1560                                         mrq->cmd->error = -ENOMEDIUM;
1561                                         if (mrq->data)
1562                                                 mrq->data->error = -ENOMEDIUM;
1563                                         if (mrq->stop)
1564                                                 mrq->stop->error = -ENOMEDIUM;
1565
1566                                         spin_unlock(&host->lock);
1567                                         mmc_request_done(slot->mmc, mrq);
1568                                         spin_lock(&host->lock);
1569                                 }
1570                         }
1571
1572                         /* Power down slot */
1573                         if (present == 0) {
1574                                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1575
1576                                 /*
1577                                  * Clear down the FIFO - doing so generates a
1578                                  * block interrupt, hence setting the
1579                                  * scatter-gather pointer to NULL.
1580                                  */
1581                                 host->sg = NULL;
1582
1583                                 ctrl = mci_readl(host, CTRL);
1584                                 ctrl |= SDMMC_CTRL_FIFO_RESET;
1585                                 mci_writel(host, CTRL, ctrl);
1586
1587 #ifdef CONFIG_MMC_DW_IDMAC
1588                                 ctrl = mci_readl(host, BMOD);
1589                                 ctrl |= 0x01; /* Software reset of DMA */
1590                                 mci_writel(host, BMOD, ctrl);
1591 #endif
1592
1593                         }
1594
1595                         spin_unlock_bh(&host->lock);
1596
1597                         /* Power down slot (after spin_unlock, may sleep) */
1598                         if (present == 0 && host->pdata->setpower)
1599                                 host->pdata->setpower(slot->id, 0);
1600
1601                         present = dw_mci_get_cd(mmc);
1602                 }
1603
1604                 mmc_detect_change(slot->mmc,
1605                         msecs_to_jiffies(host->pdata->detect_delay_ms));
1606         }
1607 }
1608
1609 static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1610 {
1611         struct mmc_host *mmc;
1612         struct dw_mci_slot *slot;
1613
1614         mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
1615         if (!mmc)
1616                 return -ENOMEM;
1617
1618         slot = mmc_priv(mmc);
1619         slot->id = id;
1620         slot->mmc = mmc;
1621         slot->host = host;
1622
1623         mmc->ops = &dw_mci_ops;
1624         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1625         mmc->f_max = host->bus_hz;
1626
1627         if (host->pdata->get_ocr)
1628                 mmc->ocr_avail = host->pdata->get_ocr(id);
1629         else
1630                 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1631
1632         /*
1633          * Start with slot power disabled, it will be enabled when a card
1634          * is detected.
1635          */
1636         if (host->pdata->setpower)
1637                 host->pdata->setpower(id, 0);
1638
1639         if (host->pdata->caps)
1640                 mmc->caps = host->pdata->caps;
1641         else
1642                 mmc->caps = 0;
1643
1644         if (host->pdata->get_bus_wd)
1645                 if (host->pdata->get_bus_wd(slot->id) >= 4)
1646                         mmc->caps |= MMC_CAP_4_BIT_DATA;
1647
1648         if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1649                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1650
1651 #ifdef CONFIG_MMC_DW_IDMAC
1652         mmc->max_segs = host->ring_size;
1653         mmc->max_blk_size = 65536;
1654         mmc->max_blk_count = host->ring_size;
1655         mmc->max_seg_size = 0x1000;
1656         mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1657 #else
1658         if (host->pdata->blk_settings) {
1659                 mmc->max_segs = host->pdata->blk_settings->max_segs;
1660                 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1661                 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1662                 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1663                 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1664         } else {
1665                 /* Useful defaults if platform data is unset. */
1666                 mmc->max_segs = 64;
1667                 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1668                 mmc->max_blk_count = 512;
1669                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1670                 mmc->max_seg_size = mmc->max_req_size;
1671         }
1672 #endif /* CONFIG_MMC_DW_IDMAC */
1673
1674         host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1675         if (IS_ERR(host->vmmc)) {
1676                 printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
1677                 host->vmmc = NULL;
1678         } else
1679                 regulator_enable(host->vmmc);
1680
1681         if (dw_mci_get_cd(mmc))
1682                 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1683         else
1684                 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1685
1686         host->slot[id] = slot;
1687         mmc_add_host(mmc);
1688
1689 #if defined(CONFIG_DEBUG_FS)
1690         dw_mci_init_debugfs(slot);
1691 #endif
1692
1693         /* Card initially undetected */
1694         slot->last_detect_state = 0;
1695
1696         /*
1697          * Card may have been plugged in prior to boot so we
1698          * need to run the detect tasklet
1699          */
1700         queue_work(dw_mci_card_workqueue, &host->card_work);
1701
1702         return 0;
1703 }
1704
1705 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
1706 {
1707         /* Shutdown detect IRQ */
1708         if (slot->host->pdata->exit)
1709                 slot->host->pdata->exit(id);
1710
1711         /* Debugfs stuff is cleaned up by mmc core */
1712         mmc_remove_host(slot->mmc);
1713         slot->host->slot[id] = NULL;
1714         mmc_free_host(slot->mmc);
1715 }
1716
1717 static void dw_mci_init_dma(struct dw_mci *host)
1718 {
1719         /* Alloc memory for sg translation */
1720         host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
1721                                           &host->sg_dma, GFP_KERNEL);
1722         if (!host->sg_cpu) {
1723                 dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
1724                         __func__);
1725                 goto no_dma;
1726         }
1727
1728         /* Determine which DMA interface to use */
1729 #ifdef CONFIG_MMC_DW_IDMAC
1730         host->dma_ops = &dw_mci_idmac_ops;
1731         dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
1732 #endif
1733
1734         if (!host->dma_ops)
1735                 goto no_dma;
1736
1737         if (host->dma_ops->init) {
1738                 if (host->dma_ops->init(host)) {
1739                         dev_err(&host->pdev->dev, "%s: Unable to initialize "
1740                                 "DMA Controller.\n", __func__);
1741                         goto no_dma;
1742                 }
1743         } else {
1744                 dev_err(&host->pdev->dev, "DMA initialization not found.\n");
1745                 goto no_dma;
1746         }
1747
1748         host->use_dma = 1;
1749         return;
1750
1751 no_dma:
1752         dev_info(&host->pdev->dev, "Using PIO mode.\n");
1753         host->use_dma = 0;
1754         return;
1755 }
1756
1757 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
1758 {
1759         unsigned long timeout = jiffies + msecs_to_jiffies(500);
1760         unsigned int ctrl;
1761
1762         mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1763                                 SDMMC_CTRL_DMA_RESET));
1764
1765         /* wait till resets clear */
1766         do {
1767                 ctrl = mci_readl(host, CTRL);
1768                 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1769                               SDMMC_CTRL_DMA_RESET)))
1770                         return true;
1771         } while (time_before(jiffies, timeout));
1772
1773         dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
1774
1775         return false;
1776 }
1777
1778 static int dw_mci_probe(struct platform_device *pdev)
1779 {
1780         struct dw_mci *host;
1781         struct resource *regs;
1782         struct dw_mci_board *pdata;
1783         int irq, ret, i, width;
1784         u32 fifo_size;
1785
1786         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1787         if (!regs)
1788                 return -ENXIO;
1789
1790         irq = platform_get_irq(pdev, 0);
1791         if (irq < 0)
1792                 return irq;
1793
1794         host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
1795         if (!host)
1796                 return -ENOMEM;
1797
1798         host->pdev = pdev;
1799         host->pdata = pdata = pdev->dev.platform_data;
1800         if (!pdata || !pdata->init) {
1801                 dev_err(&pdev->dev,
1802                         "Platform data must supply init function\n");
1803                 ret = -ENODEV;
1804                 goto err_freehost;
1805         }
1806
1807         if (!pdata->select_slot && pdata->num_slots > 1) {
1808                 dev_err(&pdev->dev,
1809                         "Platform data must supply select_slot function\n");
1810                 ret = -ENODEV;
1811                 goto err_freehost;
1812         }
1813
1814         if (!pdata->bus_hz) {
1815                 dev_err(&pdev->dev,
1816                         "Platform data must supply bus speed\n");
1817                 ret = -ENODEV;
1818                 goto err_freehost;
1819         }
1820
1821         host->bus_hz = pdata->bus_hz;
1822         host->quirks = pdata->quirks;
1823
1824         spin_lock_init(&host->lock);
1825         INIT_LIST_HEAD(&host->queue);
1826
1827         ret = -ENOMEM;
1828         host->regs = ioremap(regs->start, resource_size(regs));
1829         if (!host->regs)
1830                 goto err_freehost;
1831
1832         host->dma_ops = pdata->dma_ops;
1833         dw_mci_init_dma(host);
1834
1835         /*
1836          * Get the host data width - this assumes that HCON has been set with
1837          * the correct values.
1838          */
1839         i = (mci_readl(host, HCON) >> 7) & 0x7;
1840         if (!i) {
1841                 host->push_data = dw_mci_push_data16;
1842                 host->pull_data = dw_mci_pull_data16;
1843                 width = 16;
1844                 host->data_shift = 1;
1845         } else if (i == 2) {
1846                 host->push_data = dw_mci_push_data64;
1847                 host->pull_data = dw_mci_pull_data64;
1848                 width = 64;
1849                 host->data_shift = 3;
1850         } else {
1851                 /* Check for a reserved value, and warn if it is */
1852                 WARN((i != 1),
1853                      "HCON reports a reserved host data width!\n"
1854                      "Defaulting to 32-bit access.\n");
1855                 host->push_data = dw_mci_push_data32;
1856                 host->pull_data = dw_mci_pull_data32;
1857                 width = 32;
1858                 host->data_shift = 2;
1859         }
1860
1861         /* Reset all blocks */
1862         if (!mci_wait_reset(&pdev->dev, host)) {
1863                 ret = -ENODEV;
1864                 goto err_dmaunmap;
1865         }
1866
1867         /* Clear the interrupts for the host controller */
1868         mci_writel(host, RINTSTS, 0xFFFFFFFF);
1869         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1870
1871         /* Put in max timeout */
1872         mci_writel(host, TMOUT, 0xFFFFFFFF);
1873
1874         /*
1875          * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
1876          *                          Tx Mark = fifo_size / 2 DMA Size = 8
1877          */
1878         if (!host->pdata->fifo_depth) {
1879                 /*
1880                  * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
1881                  * have been overwritten by the bootloader, just like we're
1882                  * about to do, so if you know the value for your hardware, you
1883                  * should put it in the platform data.
1884                  */
1885                 fifo_size = mci_readl(host, FIFOTH);
1886                 fifo_size = 1 + ((fifo_size >> 16) & 0x7ff);
1887         } else {
1888                 fifo_size = host->pdata->fifo_depth;
1889         }
1890         host->fifo_depth = fifo_size;
1891         host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
1892                         ((fifo_size/2) << 0));
1893         mci_writel(host, FIFOTH, host->fifoth_val);
1894
1895         /* disable clock to CIU */
1896         mci_writel(host, CLKENA, 0);
1897         mci_writel(host, CLKSRC, 0);
1898
1899         tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
1900         dw_mci_card_workqueue = alloc_workqueue("dw-mci-card",
1901                         WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
1902         if (!dw_mci_card_workqueue)
1903                 goto err_dmaunmap;
1904         INIT_WORK(&host->card_work, dw_mci_work_routine_card);
1905
1906         ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
1907         if (ret)
1908                 goto err_workqueue;
1909
1910         platform_set_drvdata(pdev, host);
1911
1912         if (host->pdata->num_slots)
1913                 host->num_slots = host->pdata->num_slots;
1914         else
1915                 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
1916
1917         /* We need at least one slot to succeed */
1918         for (i = 0; i < host->num_slots; i++) {
1919                 ret = dw_mci_init_slot(host, i);
1920                 if (ret) {
1921                         ret = -ENODEV;
1922                         goto err_init_slot;
1923                 }
1924         }
1925
1926         /*
1927          * Enable interrupts for command done, data over, data empty, card det,
1928          * receive ready and error such as transmit, receive timeout, crc error
1929          */
1930         mci_writel(host, RINTSTS, 0xFFFFFFFF);
1931         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
1932                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
1933                    DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
1934         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
1935
1936         dev_info(&pdev->dev, "DW MMC controller at irq %d, "
1937                  "%d bit host data width, "
1938                  "%u deep fifo\n",
1939                  irq, width, fifo_size);
1940         if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
1941                 dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
1942
1943         return 0;
1944
1945 err_init_slot:
1946         /* De-init any initialized slots */
1947         while (i > 0) {
1948                 if (host->slot[i])
1949                         dw_mci_cleanup_slot(host->slot[i], i);
1950                 i--;
1951         }
1952         free_irq(irq, host);
1953
1954 err_workqueue:
1955         destroy_workqueue(dw_mci_card_workqueue);
1956
1957 err_dmaunmap:
1958         if (host->use_dma && host->dma_ops->exit)
1959                 host->dma_ops->exit(host);
1960         dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
1961                           host->sg_cpu, host->sg_dma);
1962         iounmap(host->regs);
1963
1964         if (host->vmmc) {
1965                 regulator_disable(host->vmmc);
1966                 regulator_put(host->vmmc);
1967         }
1968
1969
1970 err_freehost:
1971         kfree(host);
1972         return ret;
1973 }
1974
1975 static int __exit dw_mci_remove(struct platform_device *pdev)
1976 {
1977         struct dw_mci *host = platform_get_drvdata(pdev);
1978         int i;
1979
1980         mci_writel(host, RINTSTS, 0xFFFFFFFF);
1981         mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1982
1983         platform_set_drvdata(pdev, NULL);
1984
1985         for (i = 0; i < host->num_slots; i++) {
1986                 dev_dbg(&pdev->dev, "remove slot %d\n", i);
1987                 if (host->slot[i])
1988                         dw_mci_cleanup_slot(host->slot[i], i);
1989         }
1990
1991         /* disable clock to CIU */
1992         mci_writel(host, CLKENA, 0);
1993         mci_writel(host, CLKSRC, 0);
1994
1995         free_irq(platform_get_irq(pdev, 0), host);
1996         destroy_workqueue(dw_mci_card_workqueue);
1997         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1998
1999         if (host->use_dma && host->dma_ops->exit)
2000                 host->dma_ops->exit(host);
2001
2002         if (host->vmmc) {
2003                 regulator_disable(host->vmmc);
2004                 regulator_put(host->vmmc);
2005         }
2006
2007         iounmap(host->regs);
2008
2009         kfree(host);
2010         return 0;
2011 }
2012
2013 #ifdef CONFIG_PM
2014 /*
2015  * TODO: we should probably disable the clock to the card in the suspend path.
2016  */
2017 static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
2018 {
2019         int i, ret;
2020         struct dw_mci *host = platform_get_drvdata(pdev);
2021
2022         for (i = 0; i < host->num_slots; i++) {
2023                 struct dw_mci_slot *slot = host->slot[i];
2024                 if (!slot)
2025                         continue;
2026                 ret = mmc_suspend_host(slot->mmc);
2027                 if (ret < 0) {
2028                         while (--i >= 0) {
2029                                 slot = host->slot[i];
2030                                 if (slot)
2031                                         mmc_resume_host(host->slot[i]->mmc);
2032                         }
2033                         return ret;
2034                 }
2035         }
2036
2037         if (host->vmmc)
2038                 regulator_disable(host->vmmc);
2039
2040         return 0;
2041 }
2042
2043 static int dw_mci_resume(struct platform_device *pdev)
2044 {
2045         int i, ret;
2046         struct dw_mci *host = platform_get_drvdata(pdev);
2047
2048         if (host->vmmc)
2049                 regulator_enable(host->vmmc);
2050
2051         if (host->dma_ops->init)
2052                 host->dma_ops->init(host);
2053
2054         if (!mci_wait_reset(&pdev->dev, host)) {
2055                 ret = -ENODEV;
2056                 return ret;
2057         }
2058
2059         /* Restore the old value at FIFOTH register */
2060         mci_writel(host, FIFOTH, host->fifoth_val);
2061
2062         mci_writel(host, RINTSTS, 0xFFFFFFFF);
2063         mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2064                    SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2065                    DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2066         mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2067
2068         for (i = 0; i < host->num_slots; i++) {
2069                 struct dw_mci_slot *slot = host->slot[i];
2070                 if (!slot)
2071                         continue;
2072                 ret = mmc_resume_host(host->slot[i]->mmc);
2073                 if (ret < 0)
2074                         return ret;
2075         }
2076
2077         return 0;
2078 }
2079 #else
2080 #define dw_mci_suspend  NULL
2081 #define dw_mci_resume   NULL
2082 #endif /* CONFIG_PM */
2083
2084 static struct platform_driver dw_mci_driver = {
2085         .remove         = __exit_p(dw_mci_remove),
2086         .suspend        = dw_mci_suspend,
2087         .resume         = dw_mci_resume,
2088         .driver         = {
2089                 .name           = "dw_mmc",
2090         },
2091 };
2092
2093 static int __init dw_mci_init(void)
2094 {
2095         return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
2096 }
2097
2098 static void __exit dw_mci_exit(void)
2099 {
2100         platform_driver_unregister(&dw_mci_driver);
2101 }
2102
2103 module_init(dw_mci_init);
2104 module_exit(dw_mci_exit);
2105
2106 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2107 MODULE_AUTHOR("NXP Semiconductor VietNam");
2108 MODULE_AUTHOR("Imagination Technologies Ltd");
2109 MODULE_LICENSE("GPL v2");