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Merge 3.2-rc3 into usb-linus
[zen-stable.git] / drivers / mmc / host / dw_mmc.c
blob3aaeb0841914f6a1fdc790de71e6dbaaf15e735b
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 & 0x03ffe000) | ((s) & 0x1fff))
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->timing == MMC_TIMING_UHS_DDR50) {
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 void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
768 {
769 struct dw_mci_slot *slot = mmc_priv(mmc);
770 struct dw_mci *host = slot->host;
771 u32 int_mask;
772
773 /* Enable/disable Slot Specific SDIO interrupt */
774 int_mask = mci_readl(host, INTMASK);
775 if (enb) {
776 mci_writel(host, INTMASK,
777 (int_mask | (1 << SDMMC_INT_SDIO(slot->id))));
778 } else {
779 mci_writel(host, INTMASK,
780 (int_mask & ~(1 << SDMMC_INT_SDIO(slot->id))));
781 }
782 }
783
784 static const struct mmc_host_ops dw_mci_ops = {
785 .request = dw_mci_request,
786 .set_ios = dw_mci_set_ios,
787 .get_ro = dw_mci_get_ro,
788 .get_cd = dw_mci_get_cd,
789 .enable_sdio_irq = dw_mci_enable_sdio_irq,
790 };
791
792 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
793 __releases(&host->lock)
794 __acquires(&host->lock)
795 {
796 struct dw_mci_slot *slot;
797 struct mmc_host *prev_mmc = host->cur_slot->mmc;
798
799 WARN_ON(host->cmd || host->data);
800
801 host->cur_slot->mrq = NULL;
802 host->mrq = NULL;
803 if (!list_empty(&host->queue)) {
804 slot = list_entry(host->queue.next,
805 struct dw_mci_slot, queue_node);
806 list_del(&slot->queue_node);
807 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
808 mmc_hostname(slot->mmc));
809 host->state = STATE_SENDING_CMD;
810 dw_mci_start_request(host, slot);
811 } else {
812 dev_vdbg(&host->pdev->dev, "list empty\n");
813 host->state = STATE_IDLE;
814 }
815
816 spin_unlock(&host->lock);
817 mmc_request_done(prev_mmc, mrq);
818 spin_lock(&host->lock);
819 }
820
821 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
822 {
823 u32 status = host->cmd_status;
824
825 host->cmd_status = 0;
826
827 /* Read the response from the card (up to 16 bytes) */
828 if (cmd->flags & MMC_RSP_PRESENT) {
829 if (cmd->flags & MMC_RSP_136) {
830 cmd->resp[3] = mci_readl(host, RESP0);
831 cmd->resp[2] = mci_readl(host, RESP1);
832 cmd->resp[1] = mci_readl(host, RESP2);
833 cmd->resp[0] = mci_readl(host, RESP3);
834 } else {
835 cmd->resp[0] = mci_readl(host, RESP0);
836 cmd->resp[1] = 0;
837 cmd->resp[2] = 0;
838 cmd->resp[3] = 0;
839 }
840 }
841
842 if (status & SDMMC_INT_RTO)
843 cmd->error = -ETIMEDOUT;
844 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
845 cmd->error = -EILSEQ;
846 else if (status & SDMMC_INT_RESP_ERR)
847 cmd->error = -EIO;
848 else
849 cmd->error = 0;
850
851 if (cmd->error) {
852 /* newer ip versions need a delay between retries */
853 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
854 mdelay(20);
855
856 if (cmd->data) {
857 host->data = NULL;
858 dw_mci_stop_dma(host);
859 }
860 }
861 }
862
863 static void dw_mci_tasklet_func(unsigned long priv)
864 {
865 struct dw_mci *host = (struct dw_mci *)priv;
866 struct mmc_data *data;
867 struct mmc_command *cmd;
868 enum dw_mci_state state;
869 enum dw_mci_state prev_state;
870 u32 status, ctrl;
871
872 spin_lock(&host->lock);
873
874 state = host->state;
875 data = host->data;
876
877 do {
878 prev_state = state;
879
880 switch (state) {
881 case STATE_IDLE:
882 break;
883
884 case STATE_SENDING_CMD:
885 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
886 &host->pending_events))
887 break;
888
889 cmd = host->cmd;
890 host->cmd = NULL;
891 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
892 dw_mci_command_complete(host, host->mrq->cmd);
893 if (!host->mrq->data || cmd->error) {
894 dw_mci_request_end(host, host->mrq);
895 goto unlock;
896 }
897
898 prev_state = state = STATE_SENDING_DATA;
899 /* fall through */
900
901 case STATE_SENDING_DATA:
902 if (test_and_clear_bit(EVENT_DATA_ERROR,
903 &host->pending_events)) {
904 dw_mci_stop_dma(host);
905 if (data->stop)
906 send_stop_cmd(host, data);
907 state = STATE_DATA_ERROR;
908 break;
909 }
910
911 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
912 &host->pending_events))
913 break;
914
915 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
916 prev_state = state = STATE_DATA_BUSY;
917 /* fall through */
918
919 case STATE_DATA_BUSY:
920 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
921 &host->pending_events))
922 break;
923
924 host->data = NULL;
925 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
926 status = host->data_status;
927
928 if (status & DW_MCI_DATA_ERROR_FLAGS) {
929 if (status & SDMMC_INT_DTO) {
930 data->error = -ETIMEDOUT;
931 } else if (status & SDMMC_INT_DCRC) {
932 data->error = -EILSEQ;
933 } else if (status & SDMMC_INT_EBE &&
934 host->dir_status ==
935 DW_MCI_SEND_STATUS) {
936 /*
937 * No data CRC status was returned.
938 * The number of bytes transferred will
939 * be exaggerated in PIO mode.
940 */
941 data->bytes_xfered = 0;
942 data->error = -ETIMEDOUT;
943 } else {
944 dev_err(&host->pdev->dev,
945 "data FIFO error "
946 "(status=%08x)\n",
947 status);
948 data->error = -EIO;
949 }
950 /*
951 * After an error, there may be data lingering
952 * in the FIFO, so reset it - doing so
953 * generates a block interrupt, hence setting
954 * the scatter-gather pointer to NULL.
955 */
956 host->sg = NULL;
957 ctrl = mci_readl(host, CTRL);
958 ctrl |= SDMMC_CTRL_FIFO_RESET;
959 mci_writel(host, CTRL, ctrl);
960 } else {
961 data->bytes_xfered = data->blocks * data->blksz;
962 data->error = 0;
963 }
964
965 if (!data->stop) {
966 dw_mci_request_end(host, host->mrq);
967 goto unlock;
968 }
969
970 prev_state = state = STATE_SENDING_STOP;
971 if (!data->error)
972 send_stop_cmd(host, data);
973 /* fall through */
974
975 case STATE_SENDING_STOP:
976 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
977 &host->pending_events))
978 break;
979
980 host->cmd = NULL;
981 dw_mci_command_complete(host, host->mrq->stop);
982 dw_mci_request_end(host, host->mrq);
983 goto unlock;
984
985 case STATE_DATA_ERROR:
986 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
987 &host->pending_events))
988 break;
989
990 state = STATE_DATA_BUSY;
991 break;
992 }
993 } while (state != prev_state);
994
995 host->state = state;
996 unlock:
997 spin_unlock(&host->lock);
998
999 }
1000
1001 /* push final bytes to part_buf, only use during push */
1002 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1003 {
1004 memcpy((void *)&host->part_buf, buf, cnt);
1005 host->part_buf_count = cnt;
1006 }
1007
1008 /* append bytes to part_buf, only use during push */
1009 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1010 {
1011 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1012 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1013 host->part_buf_count += cnt;
1014 return cnt;
1015 }
1016
1017 /* pull first bytes from part_buf, only use during pull */
1018 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1019 {
1020 cnt = min(cnt, (int)host->part_buf_count);
1021 if (cnt) {
1022 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1023 cnt);
1024 host->part_buf_count -= cnt;
1025 host->part_buf_start += cnt;
1026 }
1027 return cnt;
1028 }
1029
1030 /* pull final bytes from the part_buf, assuming it's just been filled */
1031 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1032 {
1033 memcpy(buf, &host->part_buf, cnt);
1034 host->part_buf_start = cnt;
1035 host->part_buf_count = (1 << host->data_shift) - cnt;
1036 }
1037
1038 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1039 {
1040 /* try and push anything in the part_buf */
1041 if (unlikely(host->part_buf_count)) {
1042 int len = dw_mci_push_part_bytes(host, buf, cnt);
1043 buf += len;
1044 cnt -= len;
1045 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1046 mci_writew(host, DATA(host->data_offset),
1047 host->part_buf16);
1048 host->part_buf_count = 0;
1049 }
1050 }
1051 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1052 if (unlikely((unsigned long)buf & 0x1)) {
1053 while (cnt >= 2) {
1054 u16 aligned_buf[64];
1055 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1056 int items = len >> 1;
1057 int i;
1058 /* memcpy from input buffer into aligned buffer */
1059 memcpy(aligned_buf, buf, len);
1060 buf += len;
1061 cnt -= len;
1062 /* push data from aligned buffer into fifo */
1063 for (i = 0; i < items; ++i)
1064 mci_writew(host, DATA(host->data_offset),
1065 aligned_buf[i]);
1066 }
1067 } else
1068 #endif
1069 {
1070 u16 *pdata = buf;
1071 for (; cnt >= 2; cnt -= 2)
1072 mci_writew(host, DATA(host->data_offset), *pdata++);
1073 buf = pdata;
1074 }
1075 /* put anything remaining in the part_buf */
1076 if (cnt) {
1077 dw_mci_set_part_bytes(host, buf, cnt);
1078 if (!sg_next(host->sg))
1079 mci_writew(host, DATA(host->data_offset),
1080 host->part_buf16);
1081 }
1082 }
1083
1084 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1085 {
1086 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1087 if (unlikely((unsigned long)buf & 0x1)) {
1088 while (cnt >= 2) {
1089 /* pull data from fifo into aligned buffer */
1090 u16 aligned_buf[64];
1091 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1092 int items = len >> 1;
1093 int i;
1094 for (i = 0; i < items; ++i)
1095 aligned_buf[i] = mci_readw(host,
1096 DATA(host->data_offset));
1097 /* memcpy from aligned buffer into output buffer */
1098 memcpy(buf, aligned_buf, len);
1099 buf += len;
1100 cnt -= len;
1101 }
1102 } else
1103 #endif
1104 {
1105 u16 *pdata = buf;
1106 for (; cnt >= 2; cnt -= 2)
1107 *pdata++ = mci_readw(host, DATA(host->data_offset));
1108 buf = pdata;
1109 }
1110 if (cnt) {
1111 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1112 dw_mci_pull_final_bytes(host, buf, cnt);
1113 }
1114 }
1115
1116 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1117 {
1118 /* try and push anything in the part_buf */
1119 if (unlikely(host->part_buf_count)) {
1120 int len = dw_mci_push_part_bytes(host, buf, cnt);
1121 buf += len;
1122 cnt -= len;
1123 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1124 mci_writel(host, DATA(host->data_offset),
1125 host->part_buf32);
1126 host->part_buf_count = 0;
1127 }
1128 }
1129 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1130 if (unlikely((unsigned long)buf & 0x3)) {
1131 while (cnt >= 4) {
1132 u32 aligned_buf[32];
1133 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1134 int items = len >> 2;
1135 int i;
1136 /* memcpy from input buffer into aligned buffer */
1137 memcpy(aligned_buf, buf, len);
1138 buf += len;
1139 cnt -= len;
1140 /* push data from aligned buffer into fifo */
1141 for (i = 0; i < items; ++i)
1142 mci_writel(host, DATA(host->data_offset),
1143 aligned_buf[i]);
1144 }
1145 } else
1146 #endif
1147 {
1148 u32 *pdata = buf;
1149 for (; cnt >= 4; cnt -= 4)
1150 mci_writel(host, DATA(host->data_offset), *pdata++);
1151 buf = pdata;
1152 }
1153 /* put anything remaining in the part_buf */
1154 if (cnt) {
1155 dw_mci_set_part_bytes(host, buf, cnt);
1156 if (!sg_next(host->sg))
1157 mci_writel(host, DATA(host->data_offset),
1158 host->part_buf32);
1159 }
1160 }
1161
1162 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1163 {
1164 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1165 if (unlikely((unsigned long)buf & 0x3)) {
1166 while (cnt >= 4) {
1167 /* pull data from fifo into aligned buffer */
1168 u32 aligned_buf[32];
1169 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1170 int items = len >> 2;
1171 int i;
1172 for (i = 0; i < items; ++i)
1173 aligned_buf[i] = mci_readl(host,
1174 DATA(host->data_offset));
1175 /* memcpy from aligned buffer into output buffer */
1176 memcpy(buf, aligned_buf, len);
1177 buf += len;
1178 cnt -= len;
1179 }
1180 } else
1181 #endif
1182 {
1183 u32 *pdata = buf;
1184 for (; cnt >= 4; cnt -= 4)
1185 *pdata++ = mci_readl(host, DATA(host->data_offset));
1186 buf = pdata;
1187 }
1188 if (cnt) {
1189 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1190 dw_mci_pull_final_bytes(host, buf, cnt);
1191 }
1192 }
1193
1194 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1195 {
1196 /* try and push anything in the part_buf */
1197 if (unlikely(host->part_buf_count)) {
1198 int len = dw_mci_push_part_bytes(host, buf, cnt);
1199 buf += len;
1200 cnt -= len;
1201 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1202 mci_writew(host, DATA(host->data_offset),
1203 host->part_buf);
1204 host->part_buf_count = 0;
1205 }
1206 }
1207 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1208 if (unlikely((unsigned long)buf & 0x7)) {
1209 while (cnt >= 8) {
1210 u64 aligned_buf[16];
1211 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1212 int items = len >> 3;
1213 int i;
1214 /* memcpy from input buffer into aligned buffer */
1215 memcpy(aligned_buf, buf, len);
1216 buf += len;
1217 cnt -= len;
1218 /* push data from aligned buffer into fifo */
1219 for (i = 0; i < items; ++i)
1220 mci_writeq(host, DATA(host->data_offset),
1221 aligned_buf[i]);
1222 }
1223 } else
1224 #endif
1225 {
1226 u64 *pdata = buf;
1227 for (; cnt >= 8; cnt -= 8)
1228 mci_writeq(host, DATA(host->data_offset), *pdata++);
1229 buf = pdata;
1230 }
1231 /* put anything remaining in the part_buf */
1232 if (cnt) {
1233 dw_mci_set_part_bytes(host, buf, cnt);
1234 if (!sg_next(host->sg))
1235 mci_writeq(host, DATA(host->data_offset),
1236 host->part_buf);
1237 }
1238 }
1239
1240 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1241 {
1242 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1243 if (unlikely((unsigned long)buf & 0x7)) {
1244 while (cnt >= 8) {
1245 /* pull data from fifo into aligned buffer */
1246 u64 aligned_buf[16];
1247 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1248 int items = len >> 3;
1249 int i;
1250 for (i = 0; i < items; ++i)
1251 aligned_buf[i] = mci_readq(host,
1252 DATA(host->data_offset));
1253 /* memcpy from aligned buffer into output buffer */
1254 memcpy(buf, aligned_buf, len);
1255 buf += len;
1256 cnt -= len;
1257 }
1258 } else
1259 #endif
1260 {
1261 u64 *pdata = buf;
1262 for (; cnt >= 8; cnt -= 8)
1263 *pdata++ = mci_readq(host, DATA(host->data_offset));
1264 buf = pdata;
1265 }
1266 if (cnt) {
1267 host->part_buf = mci_readq(host, DATA(host->data_offset));
1268 dw_mci_pull_final_bytes(host, buf, cnt);
1269 }
1270 }
1271
1272 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1273 {
1274 int len;
1275
1276 /* get remaining partial bytes */
1277 len = dw_mci_pull_part_bytes(host, buf, cnt);
1278 if (unlikely(len == cnt))
1279 return;
1280 buf += len;
1281 cnt -= len;
1282
1283 /* get the rest of the data */
1284 host->pull_data(host, buf, cnt);
1285 }
1286
1287 static void dw_mci_read_data_pio(struct dw_mci *host)
1288 {
1289 struct scatterlist *sg = host->sg;
1290 void *buf = sg_virt(sg);
1291 unsigned int offset = host->pio_offset;
1292 struct mmc_data *data = host->data;
1293 int shift = host->data_shift;
1294 u32 status;
1295 unsigned int nbytes = 0, len;
1296
1297 do {
1298 len = host->part_buf_count +
1299 (SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
1300 if (offset + len <= sg->length) {
1301 dw_mci_pull_data(host, (void *)(buf + offset), len);
1302
1303 offset += len;
1304 nbytes += len;
1305
1306 if (offset == sg->length) {
1307 flush_dcache_page(sg_page(sg));
1308 host->sg = sg = sg_next(sg);
1309 if (!sg)
1310 goto done;
1311
1312 offset = 0;
1313 buf = sg_virt(sg);
1314 }
1315 } else {
1316 unsigned int remaining = sg->length - offset;
1317 dw_mci_pull_data(host, (void *)(buf + offset),
1318 remaining);
1319 nbytes += remaining;
1320
1321 flush_dcache_page(sg_page(sg));
1322 host->sg = sg = sg_next(sg);
1323 if (!sg)
1324 goto done;
1325
1326 offset = len - remaining;
1327 buf = sg_virt(sg);
1328 dw_mci_pull_data(host, buf, offset);
1329 nbytes += offset;
1330 }
1331
1332 status = mci_readl(host, MINTSTS);
1333 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1334 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1335 host->data_status = status;
1336 data->bytes_xfered += nbytes;
1337 smp_wmb();
1338
1339 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1340
1341 tasklet_schedule(&host->tasklet);
1342 return;
1343 }
1344 } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1345 host->pio_offset = offset;
1346 data->bytes_xfered += nbytes;
1347 return;
1348
1349 done:
1350 data->bytes_xfered += nbytes;
1351 smp_wmb();
1352 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1353 }
1354
1355 static void dw_mci_write_data_pio(struct dw_mci *host)
1356 {
1357 struct scatterlist *sg = host->sg;
1358 void *buf = sg_virt(sg);
1359 unsigned int offset = host->pio_offset;
1360 struct mmc_data *data = host->data;
1361 int shift = host->data_shift;
1362 u32 status;
1363 unsigned int nbytes = 0, len;
1364
1365 do {
1366 len = ((host->fifo_depth -
1367 SDMMC_GET_FCNT(mci_readl(host, STATUS))) << shift)
1368 - host->part_buf_count;
1369 if (offset + len <= sg->length) {
1370 host->push_data(host, (void *)(buf + offset), len);
1371
1372 offset += len;
1373 nbytes += len;
1374 if (offset == sg->length) {
1375 host->sg = sg = sg_next(sg);
1376 if (!sg)
1377 goto done;
1378
1379 offset = 0;
1380 buf = sg_virt(sg);
1381 }
1382 } else {
1383 unsigned int remaining = sg->length - offset;
1384
1385 host->push_data(host, (void *)(buf + offset),
1386 remaining);
1387 nbytes += remaining;
1388
1389 host->sg = sg = sg_next(sg);
1390 if (!sg)
1391 goto done;
1392
1393 offset = len - remaining;
1394 buf = sg_virt(sg);
1395 host->push_data(host, (void *)buf, offset);
1396 nbytes += offset;
1397 }
1398
1399 status = mci_readl(host, MINTSTS);
1400 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1401 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1402 host->data_status = status;
1403 data->bytes_xfered += nbytes;
1404
1405 smp_wmb();
1406
1407 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1408
1409 tasklet_schedule(&host->tasklet);
1410 return;
1411 }
1412 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1413 host->pio_offset = offset;
1414 data->bytes_xfered += nbytes;
1415 return;
1416
1417 done:
1418 data->bytes_xfered += nbytes;
1419 smp_wmb();
1420 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1421 }
1422
1423 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1424 {
1425 if (!host->cmd_status)
1426 host->cmd_status = status;
1427
1428 smp_wmb();
1429
1430 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1431 tasklet_schedule(&host->tasklet);
1432 }
1433
1434 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1435 {
1436 struct dw_mci *host = dev_id;
1437 u32 status, pending;
1438 unsigned int pass_count = 0;
1439 int i;
1440
1441 do {
1442 status = mci_readl(host, RINTSTS);
1443 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1444
1445 /*
1446 * DTO fix - version 2.10a and below, and only if internal DMA
1447 * is configured.
1448 */
1449 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1450 if (!pending &&
1451 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1452 pending |= SDMMC_INT_DATA_OVER;
1453 }
1454
1455 if (!pending)
1456 break;
1457
1458 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1459 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1460 host->cmd_status = status;
1461 smp_wmb();
1462 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1463 }
1464
1465 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1466 /* if there is an error report DATA_ERROR */
1467 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1468 host->data_status = status;
1469 smp_wmb();
1470 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1471 if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
1472 SDMMC_INT_SBE | SDMMC_INT_EBE)))
1473 tasklet_schedule(&host->tasklet);
1474 }
1475
1476 if (pending & SDMMC_INT_DATA_OVER) {
1477 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1478 if (!host->data_status)
1479 host->data_status = status;
1480 smp_wmb();
1481 if (host->dir_status == DW_MCI_RECV_STATUS) {
1482 if (host->sg != NULL)
1483 dw_mci_read_data_pio(host);
1484 }
1485 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1486 tasklet_schedule(&host->tasklet);
1487 }
1488
1489 if (pending & SDMMC_INT_RXDR) {
1490 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1491 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1492 dw_mci_read_data_pio(host);
1493 }
1494
1495 if (pending & SDMMC_INT_TXDR) {
1496 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1497 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1498 dw_mci_write_data_pio(host);
1499 }
1500
1501 if (pending & SDMMC_INT_CMD_DONE) {
1502 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1503 dw_mci_cmd_interrupt(host, status);
1504 }
1505
1506 if (pending & SDMMC_INT_CD) {
1507 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1508 queue_work(dw_mci_card_workqueue, &host->card_work);
1509 }
1510
1511 /* Handle SDIO Interrupts */
1512 for (i = 0; i < host->num_slots; i++) {
1513 struct dw_mci_slot *slot = host->slot[i];
1514 if (pending & SDMMC_INT_SDIO(i)) {
1515 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1516 mmc_signal_sdio_irq(slot->mmc);
1517 }
1518 }
1519
1520 } while (pass_count++ < 5);
1521
1522 #ifdef CONFIG_MMC_DW_IDMAC
1523 /* Handle DMA interrupts */
1524 pending = mci_readl(host, IDSTS);
1525 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1526 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1527 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1528 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1529 host->dma_ops->complete(host);
1530 }
1531 #endif
1532
1533 return IRQ_HANDLED;
1534 }
1535
1536 static void dw_mci_work_routine_card(struct work_struct *work)
1537 {
1538 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1539 int i;
1540
1541 for (i = 0; i < host->num_slots; i++) {
1542 struct dw_mci_slot *slot = host->slot[i];
1543 struct mmc_host *mmc = slot->mmc;
1544 struct mmc_request *mrq;
1545 int present;
1546 u32 ctrl;
1547
1548 present = dw_mci_get_cd(mmc);
1549 while (present != slot->last_detect_state) {
1550 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1551 present ? "inserted" : "removed");
1552
1553 /* Power up slot (before spin_lock, may sleep) */
1554 if (present != 0 && host->pdata->setpower)
1555 host->pdata->setpower(slot->id, mmc->ocr_avail);
1556
1557 spin_lock_bh(&host->lock);
1558
1559 /* Card change detected */
1560 slot->last_detect_state = present;
1561
1562 /* Mark card as present if applicable */
1563 if (present != 0)
1564 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1565
1566 /* Clean up queue if present */
1567 mrq = slot->mrq;
1568 if (mrq) {
1569 if (mrq == host->mrq) {
1570 host->data = NULL;
1571 host->cmd = NULL;
1572
1573 switch (host->state) {
1574 case STATE_IDLE:
1575 break;
1576 case STATE_SENDING_CMD:
1577 mrq->cmd->error = -ENOMEDIUM;
1578 if (!mrq->data)
1579 break;
1580 /* fall through */
1581 case STATE_SENDING_DATA:
1582 mrq->data->error = -ENOMEDIUM;
1583 dw_mci_stop_dma(host);
1584 break;
1585 case STATE_DATA_BUSY:
1586 case STATE_DATA_ERROR:
1587 if (mrq->data->error == -EINPROGRESS)
1588 mrq->data->error = -ENOMEDIUM;
1589 if (!mrq->stop)
1590 break;
1591 /* fall through */
1592 case STATE_SENDING_STOP:
1593 mrq->stop->error = -ENOMEDIUM;
1594 break;
1595 }
1596
1597 dw_mci_request_end(host, mrq);
1598 } else {
1599 list_del(&slot->queue_node);
1600 mrq->cmd->error = -ENOMEDIUM;
1601 if (mrq->data)
1602 mrq->data->error = -ENOMEDIUM;
1603 if (mrq->stop)
1604 mrq->stop->error = -ENOMEDIUM;
1605
1606 spin_unlock(&host->lock);
1607 mmc_request_done(slot->mmc, mrq);
1608 spin_lock(&host->lock);
1609 }
1610 }
1611
1612 /* Power down slot */
1613 if (present == 0) {
1614 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1615
1616 /*
1617 * Clear down the FIFO - doing so generates a
1618 * block interrupt, hence setting the
1619 * scatter-gather pointer to NULL.
1620 */
1621 host->sg = NULL;
1622
1623 ctrl = mci_readl(host, CTRL);
1624 ctrl |= SDMMC_CTRL_FIFO_RESET;
1625 mci_writel(host, CTRL, ctrl);
1626
1627 #ifdef CONFIG_MMC_DW_IDMAC
1628 ctrl = mci_readl(host, BMOD);
1629 ctrl |= 0x01; /* Software reset of DMA */
1630 mci_writel(host, BMOD, ctrl);
1631 #endif
1632
1633 }
1634
1635 spin_unlock_bh(&host->lock);
1636
1637 /* Power down slot (after spin_unlock, may sleep) */
1638 if (present == 0 && host->pdata->setpower)
1639 host->pdata->setpower(slot->id, 0);
1640
1641 present = dw_mci_get_cd(mmc);
1642 }
1643
1644 mmc_detect_change(slot->mmc,
1645 msecs_to_jiffies(host->pdata->detect_delay_ms));
1646 }
1647 }
1648
1649 static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1650 {
1651 struct mmc_host *mmc;
1652 struct dw_mci_slot *slot;
1653
1654 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
1655 if (!mmc)
1656 return -ENOMEM;
1657
1658 slot = mmc_priv(mmc);
1659 slot->id = id;
1660 slot->mmc = mmc;
1661 slot->host = host;
1662
1663 mmc->ops = &dw_mci_ops;
1664 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1665 mmc->f_max = host->bus_hz;
1666
1667 if (host->pdata->get_ocr)
1668 mmc->ocr_avail = host->pdata->get_ocr(id);
1669 else
1670 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1671
1672 /*
1673 * Start with slot power disabled, it will be enabled when a card
1674 * is detected.
1675 */
1676 if (host->pdata->setpower)
1677 host->pdata->setpower(id, 0);
1678
1679 if (host->pdata->caps)
1680 mmc->caps = host->pdata->caps;
1681 else
1682 mmc->caps = 0;
1683
1684 if (host->pdata->get_bus_wd)
1685 if (host->pdata->get_bus_wd(slot->id) >= 4)
1686 mmc->caps |= MMC_CAP_4_BIT_DATA;
1687
1688 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1689 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1690
1691 #ifdef CONFIG_MMC_DW_IDMAC
1692 mmc->max_segs = host->ring_size;
1693 mmc->max_blk_size = 65536;
1694 mmc->max_blk_count = host->ring_size;
1695 mmc->max_seg_size = 0x1000;
1696 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1697 #else
1698 if (host->pdata->blk_settings) {
1699 mmc->max_segs = host->pdata->blk_settings->max_segs;
1700 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1701 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1702 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1703 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1704 } else {
1705 /* Useful defaults if platform data is unset. */
1706 mmc->max_segs = 64;
1707 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1708 mmc->max_blk_count = 512;
1709 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1710 mmc->max_seg_size = mmc->max_req_size;
1711 }
1712 #endif /* CONFIG_MMC_DW_IDMAC */
1713
1714 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1715 if (IS_ERR(host->vmmc)) {
1716 pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
1717 host->vmmc = NULL;
1718 } else
1719 regulator_enable(host->vmmc);
1720
1721 if (dw_mci_get_cd(mmc))
1722 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1723 else
1724 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1725
1726 host->slot[id] = slot;
1727 mmc_add_host(mmc);
1728
1729 #if defined(CONFIG_DEBUG_FS)
1730 dw_mci_init_debugfs(slot);
1731 #endif
1732
1733 /* Card initially undetected */
1734 slot->last_detect_state = 0;
1735
1736 /*
1737 * Card may have been plugged in prior to boot so we
1738 * need to run the detect tasklet
1739 */
1740 queue_work(dw_mci_card_workqueue, &host->card_work);
1741
1742 return 0;
1743 }
1744
1745 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
1746 {
1747 /* Shutdown detect IRQ */
1748 if (slot->host->pdata->exit)
1749 slot->host->pdata->exit(id);
1750
1751 /* Debugfs stuff is cleaned up by mmc core */
1752 mmc_remove_host(slot->mmc);
1753 slot->host->slot[id] = NULL;
1754 mmc_free_host(slot->mmc);
1755 }
1756
1757 static void dw_mci_init_dma(struct dw_mci *host)
1758 {
1759 /* Alloc memory for sg translation */
1760 host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
1761 &host->sg_dma, GFP_KERNEL);
1762 if (!host->sg_cpu) {
1763 dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
1764 __func__);
1765 goto no_dma;
1766 }
1767
1768 /* Determine which DMA interface to use */
1769 #ifdef CONFIG_MMC_DW_IDMAC
1770 host->dma_ops = &dw_mci_idmac_ops;
1771 dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
1772 #endif
1773
1774 if (!host->dma_ops)
1775 goto no_dma;
1776
1777 if (host->dma_ops->init) {
1778 if (host->dma_ops->init(host)) {
1779 dev_err(&host->pdev->dev, "%s: Unable to initialize "
1780 "DMA Controller.\n", __func__);
1781 goto no_dma;
1782 }
1783 } else {
1784 dev_err(&host->pdev->dev, "DMA initialization not found.\n");
1785 goto no_dma;
1786 }
1787
1788 host->use_dma = 1;
1789 return;
1790
1791 no_dma:
1792 dev_info(&host->pdev->dev, "Using PIO mode.\n");
1793 host->use_dma = 0;
1794 return;
1795 }
1796
1797 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
1798 {
1799 unsigned long timeout = jiffies + msecs_to_jiffies(500);
1800 unsigned int ctrl;
1801
1802 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1803 SDMMC_CTRL_DMA_RESET));
1804
1805 /* wait till resets clear */
1806 do {
1807 ctrl = mci_readl(host, CTRL);
1808 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1809 SDMMC_CTRL_DMA_RESET)))
1810 return true;
1811 } while (time_before(jiffies, timeout));
1812
1813 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
1814
1815 return false;
1816 }
1817
1818 static int dw_mci_probe(struct platform_device *pdev)
1819 {
1820 struct dw_mci *host;
1821 struct resource *regs;
1822 struct dw_mci_board *pdata;
1823 int irq, ret, i, width;
1824 u32 fifo_size;
1825
1826 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1827 if (!regs)
1828 return -ENXIO;
1829
1830 irq = platform_get_irq(pdev, 0);
1831 if (irq < 0)
1832 return irq;
1833
1834 host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
1835 if (!host)
1836 return -ENOMEM;
1837
1838 host->pdev = pdev;
1839 host->pdata = pdata = pdev->dev.platform_data;
1840 if (!pdata || !pdata->init) {
1841 dev_err(&pdev->dev,
1842 "Platform data must supply init function\n");
1843 ret = -ENODEV;
1844 goto err_freehost;
1845 }
1846
1847 if (!pdata->select_slot && pdata->num_slots > 1) {
1848 dev_err(&pdev->dev,
1849 "Platform data must supply select_slot function\n");
1850 ret = -ENODEV;
1851 goto err_freehost;
1852 }
1853
1854 if (!pdata->bus_hz) {
1855 dev_err(&pdev->dev,
1856 "Platform data must supply bus speed\n");
1857 ret = -ENODEV;
1858 goto err_freehost;
1859 }
1860
1861 host->bus_hz = pdata->bus_hz;
1862 host->quirks = pdata->quirks;
1863
1864 spin_lock_init(&host->lock);
1865 INIT_LIST_HEAD(&host->queue);
1866
1867 ret = -ENOMEM;
1868 host->regs = ioremap(regs->start, resource_size(regs));
1869 if (!host->regs)
1870 goto err_freehost;
1871
1872 host->dma_ops = pdata->dma_ops;
1873 dw_mci_init_dma(host);
1874
1875 /*
1876 * Get the host data width - this assumes that HCON has been set with
1877 * the correct values.
1878 */
1879 i = (mci_readl(host, HCON) >> 7) & 0x7;
1880 if (!i) {
1881 host->push_data = dw_mci_push_data16;
1882 host->pull_data = dw_mci_pull_data16;
1883 width = 16;
1884 host->data_shift = 1;
1885 } else if (i == 2) {
1886 host->push_data = dw_mci_push_data64;
1887 host->pull_data = dw_mci_pull_data64;
1888 width = 64;
1889 host->data_shift = 3;
1890 } else {
1891 /* Check for a reserved value, and warn if it is */
1892 WARN((i != 1),
1893 "HCON reports a reserved host data width!\n"
1894 "Defaulting to 32-bit access.\n");
1895 host->push_data = dw_mci_push_data32;
1896 host->pull_data = dw_mci_pull_data32;
1897 width = 32;
1898 host->data_shift = 2;
1899 }
1900
1901 /* Reset all blocks */
1902 if (!mci_wait_reset(&pdev->dev, host)) {
1903 ret = -ENODEV;
1904 goto err_dmaunmap;
1905 }
1906
1907 /* Clear the interrupts for the host controller */
1908 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1909 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1910
1911 /* Put in max timeout */
1912 mci_writel(host, TMOUT, 0xFFFFFFFF);
1913
1914 /*
1915 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
1916 * Tx Mark = fifo_size / 2 DMA Size = 8
1917 */
1918 if (!host->pdata->fifo_depth) {
1919 /*
1920 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
1921 * have been overwritten by the bootloader, just like we're
1922 * about to do, so if you know the value for your hardware, you
1923 * should put it in the platform data.
1924 */
1925 fifo_size = mci_readl(host, FIFOTH);
1926 fifo_size = 1 + ((fifo_size >> 16) & 0x7ff);
1927 } else {
1928 fifo_size = host->pdata->fifo_depth;
1929 }
1930 host->fifo_depth = fifo_size;
1931 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
1932 ((fifo_size/2) << 0));
1933 mci_writel(host, FIFOTH, host->fifoth_val);
1934
1935 /* disable clock to CIU */
1936 mci_writel(host, CLKENA, 0);
1937 mci_writel(host, CLKSRC, 0);
1938
1939 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
1940 dw_mci_card_workqueue = alloc_workqueue("dw-mci-card",
1941 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
1942 if (!dw_mci_card_workqueue)
1943 goto err_dmaunmap;
1944 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
1945
1946 ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
1947 if (ret)
1948 goto err_workqueue;
1949
1950 platform_set_drvdata(pdev, host);
1951
1952 if (host->pdata->num_slots)
1953 host->num_slots = host->pdata->num_slots;
1954 else
1955 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
1956
1957 /* We need at least one slot to succeed */
1958 for (i = 0; i < host->num_slots; i++) {
1959 ret = dw_mci_init_slot(host, i);
1960 if (ret) {
1961 ret = -ENODEV;
1962 goto err_init_slot;
1963 }
1964 }
1965
1966 /*
1967 * In 2.40a spec, Data offset is changed.
1968 * Need to check the version-id and set data-offset for DATA register.
1969 */
1970 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
1971 dev_info(&pdev->dev, "Version ID is %04x\n", host->verid);
1972
1973 if (host->verid < DW_MMC_240A)
1974 host->data_offset = DATA_OFFSET;
1975 else
1976 host->data_offset = DATA_240A_OFFSET;
1977
1978 /*
1979 * Enable interrupts for command done, data over, data empty, card det,
1980 * receive ready and error such as transmit, receive timeout, crc error
1981 */
1982 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1983 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
1984 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
1985 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
1986 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
1987
1988 dev_info(&pdev->dev, "DW MMC controller at irq %d, "
1989 "%d bit host data width, "
1990 "%u deep fifo\n",
1991 irq, width, fifo_size);
1992 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
1993 dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
1994
1995 return 0;
1996
1997 err_init_slot:
1998 /* De-init any initialized slots */
1999 while (i > 0) {
2000 if (host->slot[i])
2001 dw_mci_cleanup_slot(host->slot[i], i);
2002 i--;
2003 }
2004 free_irq(irq, host);
2005
2006 err_workqueue:
2007 destroy_workqueue(dw_mci_card_workqueue);
2008
2009 err_dmaunmap:
2010 if (host->use_dma && host->dma_ops->exit)
2011 host->dma_ops->exit(host);
2012 dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
2013 host->sg_cpu, host->sg_dma);
2014 iounmap(host->regs);
2015
2016 if (host->vmmc) {
2017 regulator_disable(host->vmmc);
2018 regulator_put(host->vmmc);
2019 }
2020
2021
2022 err_freehost:
2023 kfree(host);
2024 return ret;
2025 }
2026
2027 static int __exit dw_mci_remove(struct platform_device *pdev)
2028 {
2029 struct dw_mci *host = platform_get_drvdata(pdev);
2030 int i;
2031
2032 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2033 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2034
2035 platform_set_drvdata(pdev, NULL);
2036
2037 for (i = 0; i < host->num_slots; i++) {
2038 dev_dbg(&pdev->dev, "remove slot %d\n", i);
2039 if (host->slot[i])
2040 dw_mci_cleanup_slot(host->slot[i], i);
2041 }
2042
2043 /* disable clock to CIU */
2044 mci_writel(host, CLKENA, 0);
2045 mci_writel(host, CLKSRC, 0);
2046
2047 free_irq(platform_get_irq(pdev, 0), host);
2048 destroy_workqueue(dw_mci_card_workqueue);
2049 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
2050
2051 if (host->use_dma && host->dma_ops->exit)
2052 host->dma_ops->exit(host);
2053
2054 if (host->vmmc) {
2055 regulator_disable(host->vmmc);
2056 regulator_put(host->vmmc);
2057 }
2058
2059 iounmap(host->regs);
2060
2061 kfree(host);
2062 return 0;
2063 }
2064
2065 #ifdef CONFIG_PM
2066 /*
2067 * TODO: we should probably disable the clock to the card in the suspend path.
2068 */
2069 static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
2070 {
2071 int i, ret;
2072 struct dw_mci *host = platform_get_drvdata(pdev);
2073
2074 for (i = 0; i < host->num_slots; i++) {
2075 struct dw_mci_slot *slot = host->slot[i];
2076 if (!slot)
2077 continue;
2078 ret = mmc_suspend_host(slot->mmc);
2079 if (ret < 0) {
2080 while (--i >= 0) {
2081 slot = host->slot[i];
2082 if (slot)
2083 mmc_resume_host(host->slot[i]->mmc);
2084 }
2085 return ret;
2086 }
2087 }
2088
2089 if (host->vmmc)
2090 regulator_disable(host->vmmc);
2091
2092 return 0;
2093 }
2094
2095 static int dw_mci_resume(struct platform_device *pdev)
2096 {
2097 int i, ret;
2098 struct dw_mci *host = platform_get_drvdata(pdev);
2099
2100 if (host->vmmc)
2101 regulator_enable(host->vmmc);
2102
2103 if (host->dma_ops->init)
2104 host->dma_ops->init(host);
2105
2106 if (!mci_wait_reset(&pdev->dev, host)) {
2107 ret = -ENODEV;
2108 return ret;
2109 }
2110
2111 /* Restore the old value at FIFOTH register */
2112 mci_writel(host, FIFOTH, host->fifoth_val);
2113
2114 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2115 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2116 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2117 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2118 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2119
2120 for (i = 0; i < host->num_slots; i++) {
2121 struct dw_mci_slot *slot = host->slot[i];
2122 if (!slot)
2123 continue;
2124 ret = mmc_resume_host(host->slot[i]->mmc);
2125 if (ret < 0)
2126 return ret;
2127 }
2128
2129 return 0;
2130 }
2131 #else
2132 #define dw_mci_suspend NULL
2133 #define dw_mci_resume NULL
2134 #endif /* CONFIG_PM */
2135
2136 static struct platform_driver dw_mci_driver = {
2137 .remove = __exit_p(dw_mci_remove),
2138 .suspend = dw_mci_suspend,
2139 .resume = dw_mci_resume,
2140 .driver = {
2141 .name = "dw_mmc",
2142 },
2143 };
2144
2145 static int __init dw_mci_init(void)
2146 {
2147 return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
2148 }
2149
2150 static void __exit dw_mci_exit(void)
2151 {
2152 platform_driver_unregister(&dw_mci_driver);
2153 }
2154
2155 module_init(dw_mci_init);
2156 module_exit(dw_mci_exit);
2157
2158 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2159 MODULE_AUTHOR("NXP Semiconductor VietNam");
2160 MODULE_AUTHOR("Imagination Technologies Ltd");
2161 MODULE_LICENSE("GPL v2");