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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / host / dw_mmc.c
blob8bec1c36b159159593bcad0263f0bca2787d4b92
1 /*
2 * Synopsys DesignWare Multimedia Card Interface driver
3 * (Based on NXP driver for lpc 31xx)
4 *
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/blkdev.h>
15 #include <linux/clk.h>
16 #include <linux/debugfs.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/interrupt.h>
22 #include <linux/ioport.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
25 #include <linux/seq_file.h>
26 #include <linux/slab.h>
27 #include <linux/stat.h>
28 #include <linux/delay.h>
29 #include <linux/irq.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/dw_mmc.h>
33 #include <linux/bitops.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/workqueue.h>
36
37 #include "dw_mmc.h"
38
39 /* Common flag combinations */
40 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
41 SDMMC_INT_HTO | SDMMC_INT_SBE | \
42 SDMMC_INT_EBE)
43 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
44 SDMMC_INT_RESP_ERR)
45 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
46 DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
47 #define DW_MCI_SEND_STATUS 1
48 #define DW_MCI_RECV_STATUS 2
49 #define DW_MCI_DMA_THRESHOLD 16
50
51 #ifdef CONFIG_MMC_DW_IDMAC
52 struct idmac_desc {
53 u32 des0; /* Control Descriptor */
54 #define IDMAC_DES0_DIC BIT(1)
55 #define IDMAC_DES0_LD BIT(2)
56 #define IDMAC_DES0_FD BIT(3)
57 #define IDMAC_DES0_CH BIT(4)
58 #define IDMAC_DES0_ER BIT(5)
59 #define IDMAC_DES0_CES BIT(30)
60 #define IDMAC_DES0_OWN BIT(31)
61
62 u32 des1; /* Buffer sizes */
63 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
64 ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
65
66 u32 des2; /* buffer 1 physical address */
67
68 u32 des3; /* buffer 2 physical address */
69 };
70 #endif /* CONFIG_MMC_DW_IDMAC */
71
72 /**
73 * struct dw_mci_slot - MMC slot state
74 * @mmc: The mmc_host representing this slot.
75 * @host: The MMC controller this slot is using.
76 * @ctype: Card type for this slot.
77 * @mrq: mmc_request currently being processed or waiting to be
78 * processed, or NULL when the slot is idle.
79 * @queue_node: List node for placing this node in the @queue list of
80 * &struct dw_mci.
81 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
82 * @flags: Random state bits associated with the slot.
83 * @id: Number of this slot.
84 * @last_detect_state: Most recently observed card detect state.
85 */
86 struct dw_mci_slot {
87 struct mmc_host *mmc;
88 struct dw_mci *host;
89
90 u32 ctype;
91
92 struct mmc_request *mrq;
93 struct list_head queue_node;
94
95 unsigned int clock;
96 unsigned long flags;
97 #define DW_MMC_CARD_PRESENT 0
98 #define DW_MMC_CARD_NEED_INIT 1
99 int id;
100 int last_detect_state;
101 };
102
103 static struct workqueue_struct *dw_mci_card_workqueue;
104
105 #if defined(CONFIG_DEBUG_FS)
106 static int dw_mci_req_show(struct seq_file *s, void *v)
107 {
108 struct dw_mci_slot *slot = s->private;
109 struct mmc_request *mrq;
110 struct mmc_command *cmd;
111 struct mmc_command *stop;
112 struct mmc_data *data;
113
114 /* Make sure we get a consistent snapshot */
115 spin_lock_bh(&slot->host->lock);
116 mrq = slot->mrq;
117
118 if (mrq) {
119 cmd = mrq->cmd;
120 data = mrq->data;
121 stop = mrq->stop;
122
123 if (cmd)
124 seq_printf(s,
125 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
126 cmd->opcode, cmd->arg, cmd->flags,
127 cmd->resp[0], cmd->resp[1], cmd->resp[2],
128 cmd->resp[2], cmd->error);
129 if (data)
130 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
131 data->bytes_xfered, data->blocks,
132 data->blksz, data->flags, data->error);
133 if (stop)
134 seq_printf(s,
135 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
136 stop->opcode, stop->arg, stop->flags,
137 stop->resp[0], stop->resp[1], stop->resp[2],
138 stop->resp[2], stop->error);
139 }
140
141 spin_unlock_bh(&slot->host->lock);
142
143 return 0;
144 }
145
146 static int dw_mci_req_open(struct inode *inode, struct file *file)
147 {
148 return single_open(file, dw_mci_req_show, inode->i_private);
149 }
150
151 static const struct file_operations dw_mci_req_fops = {
152 .owner = THIS_MODULE,
153 .open = dw_mci_req_open,
154 .read = seq_read,
155 .llseek = seq_lseek,
156 .release = single_release,
157 };
158
159 static int dw_mci_regs_show(struct seq_file *s, void *v)
160 {
161 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
162 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
163 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
164 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
165 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
166 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
167
168 return 0;
169 }
170
171 static int dw_mci_regs_open(struct inode *inode, struct file *file)
172 {
173 return single_open(file, dw_mci_regs_show, inode->i_private);
174 }
175
176 static const struct file_operations dw_mci_regs_fops = {
177 .owner = THIS_MODULE,
178 .open = dw_mci_regs_open,
179 .read = seq_read,
180 .llseek = seq_lseek,
181 .release = single_release,
182 };
183
184 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
185 {
186 struct mmc_host *mmc = slot->mmc;
187 struct dw_mci *host = slot->host;
188 struct dentry *root;
189 struct dentry *node;
190
191 root = mmc->debugfs_root;
192 if (!root)
193 return;
194
195 node = debugfs_create_file("regs", S_IRUSR, root, host,
196 &dw_mci_regs_fops);
197 if (!node)
198 goto err;
199
200 node = debugfs_create_file("req", S_IRUSR, root, slot,
201 &dw_mci_req_fops);
202 if (!node)
203 goto err;
204
205 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
206 if (!node)
207 goto err;
208
209 node = debugfs_create_x32("pending_events", S_IRUSR, root,
210 (u32 *)&host->pending_events);
211 if (!node)
212 goto err;
213
214 node = debugfs_create_x32("completed_events", S_IRUSR, root,
215 (u32 *)&host->completed_events);
216 if (!node)
217 goto err;
218
219 return;
220
221 err:
222 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
223 }
224 #endif /* defined(CONFIG_DEBUG_FS) */
225
226 static void dw_mci_set_timeout(struct dw_mci *host)
227 {
228 /* timeout (maximum) */
229 mci_writel(host, TMOUT, 0xffffffff);
230 }
231
232 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
233 {
234 struct mmc_data *data;
235 u32 cmdr;
236 cmd->error = -EINPROGRESS;
237
238 cmdr = cmd->opcode;
239
240 if (cmdr == MMC_STOP_TRANSMISSION)
241 cmdr |= SDMMC_CMD_STOP;
242 else
243 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
244
245 if (cmd->flags & MMC_RSP_PRESENT) {
246 /* We expect a response, so set this bit */
247 cmdr |= SDMMC_CMD_RESP_EXP;
248 if (cmd->flags & MMC_RSP_136)
249 cmdr |= SDMMC_CMD_RESP_LONG;
250 }
251
252 if (cmd->flags & MMC_RSP_CRC)
253 cmdr |= SDMMC_CMD_RESP_CRC;
254
255 data = cmd->data;
256 if (data) {
257 cmdr |= SDMMC_CMD_DAT_EXP;
258 if (data->flags & MMC_DATA_STREAM)
259 cmdr |= SDMMC_CMD_STRM_MODE;
260 if (data->flags & MMC_DATA_WRITE)
261 cmdr |= SDMMC_CMD_DAT_WR;
262 }
263
264 return cmdr;
265 }
266
267 static void dw_mci_start_command(struct dw_mci *host,
268 struct mmc_command *cmd, u32 cmd_flags)
269 {
270 host->cmd = cmd;
271 dev_vdbg(&host->pdev->dev,
272 "start command: ARGR=0x%08x CMDR=0x%08x\n",
273 cmd->arg, cmd_flags);
274
275 mci_writel(host, CMDARG, cmd->arg);
276 wmb();
277
278 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
279 }
280
281 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
282 {
283 dw_mci_start_command(host, data->stop, host->stop_cmdr);
284 }
285
286 /* DMA interface functions */
287 static void dw_mci_stop_dma(struct dw_mci *host)
288 {
289 if (host->using_dma) {
290 host->dma_ops->stop(host);
291 host->dma_ops->cleanup(host);
292 } else {
293 /* Data transfer was stopped by the interrupt handler */
294 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
295 }
296 }
297
298 #ifdef CONFIG_MMC_DW_IDMAC
299 static void dw_mci_dma_cleanup(struct dw_mci *host)
300 {
301 struct mmc_data *data = host->data;
302
303 if (data)
304 dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
305 ((data->flags & MMC_DATA_WRITE)
306 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
307 }
308
309 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
310 {
311 u32 temp;
312
313 /* Disable and reset the IDMAC interface */
314 temp = mci_readl(host, CTRL);
315 temp &= ~SDMMC_CTRL_USE_IDMAC;
316 temp |= SDMMC_CTRL_DMA_RESET;
317 mci_writel(host, CTRL, temp);
318
319 /* Stop the IDMAC running */
320 temp = mci_readl(host, BMOD);
321 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
322 mci_writel(host, BMOD, temp);
323 }
324
325 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
326 {
327 struct mmc_data *data = host->data;
328
329 dev_vdbg(&host->pdev->dev, "DMA complete\n");
330
331 host->dma_ops->cleanup(host);
332
333 /*
334 * If the card was removed, data will be NULL. No point in trying to
335 * send the stop command or waiting for NBUSY in this case.
336 */
337 if (data) {
338 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
339 tasklet_schedule(&host->tasklet);
340 }
341 }
342
343 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
344 unsigned int sg_len)
345 {
346 int i;
347 struct idmac_desc *desc = host->sg_cpu;
348
349 for (i = 0; i < sg_len; i++, desc++) {
350 unsigned int length = sg_dma_len(&data->sg[i]);
351 u32 mem_addr = sg_dma_address(&data->sg[i]);
352
353 /* Set the OWN bit and disable interrupts for this descriptor */
354 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
355
356 /* Buffer length */
357 IDMAC_SET_BUFFER1_SIZE(desc, length);
358
359 /* Physical address to DMA to/from */
360 desc->des2 = mem_addr;
361 }
362
363 /* Set first descriptor */
364 desc = host->sg_cpu;
365 desc->des0 |= IDMAC_DES0_FD;
366
367 /* Set last descriptor */
368 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
369 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
370 desc->des0 |= IDMAC_DES0_LD;
371
372 wmb();
373 }
374
375 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
376 {
377 u32 temp;
378
379 dw_mci_translate_sglist(host, host->data, sg_len);
380
381 /* Select IDMAC interface */
382 temp = mci_readl(host, CTRL);
383 temp |= SDMMC_CTRL_USE_IDMAC;
384 mci_writel(host, CTRL, temp);
385
386 wmb();
387
388 /* Enable the IDMAC */
389 temp = mci_readl(host, BMOD);
390 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
391 mci_writel(host, BMOD, temp);
392
393 /* Start it running */
394 mci_writel(host, PLDMND, 1);
395 }
396
397 static int dw_mci_idmac_init(struct dw_mci *host)
398 {
399 struct idmac_desc *p;
400 int i;
401
402 /* Number of descriptors in the ring buffer */
403 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
404
405 /* Forward link the descriptor list */
406 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
407 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
408
409 /* Set the last descriptor as the end-of-ring descriptor */
410 p->des3 = host->sg_dma;
411 p->des0 = IDMAC_DES0_ER;
412
413 /* Mask out interrupts - get Tx & Rx complete only */
414 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
415 SDMMC_IDMAC_INT_TI);
416
417 /* Set the descriptor base address */
418 mci_writel(host, DBADDR, host->sg_dma);
419 return 0;
420 }
421
422 static struct dw_mci_dma_ops dw_mci_idmac_ops = {
423 .init = dw_mci_idmac_init,
424 .start = dw_mci_idmac_start_dma,
425 .stop = dw_mci_idmac_stop_dma,
426 .complete = dw_mci_idmac_complete_dma,
427 .cleanup = dw_mci_dma_cleanup,
428 };
429 #endif /* CONFIG_MMC_DW_IDMAC */
430
431 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
432 {
433 struct scatterlist *sg;
434 unsigned int i, direction, sg_len;
435 u32 temp;
436
437 host->using_dma = 0;
438
439 /* If we don't have a channel, we can't do DMA */
440 if (!host->use_dma)
441 return -ENODEV;
442
443 /*
444 * We don't do DMA on "complex" transfers, i.e. with
445 * non-word-aligned buffers or lengths. Also, we don't bother
446 * with all the DMA setup overhead for short transfers.
447 */
448 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
449 return -EINVAL;
450 if (data->blksz & 3)
451 return -EINVAL;
452
453 for_each_sg(data->sg, sg, data->sg_len, i) {
454 if (sg->offset & 3 || sg->length & 3)
455 return -EINVAL;
456 }
457
458 host->using_dma = 1;
459
460 if (data->flags & MMC_DATA_READ)
461 direction = DMA_FROM_DEVICE;
462 else
463 direction = DMA_TO_DEVICE;
464
465 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
466 direction);
467
468 dev_vdbg(&host->pdev->dev,
469 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
470 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
471 sg_len);
472
473 /* Enable the DMA interface */
474 temp = mci_readl(host, CTRL);
475 temp |= SDMMC_CTRL_DMA_ENABLE;
476 mci_writel(host, CTRL, temp);
477
478 /* Disable RX/TX IRQs, let DMA handle it */
479 temp = mci_readl(host, INTMASK);
480 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
481 mci_writel(host, INTMASK, temp);
482
483 host->dma_ops->start(host, sg_len);
484
485 return 0;
486 }
487
488 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
489 {
490 u32 temp;
491
492 data->error = -EINPROGRESS;
493
494 WARN_ON(host->data);
495 host->sg = NULL;
496 host->data = data;
497
498 if (data->flags & MMC_DATA_READ)
499 host->dir_status = DW_MCI_RECV_STATUS;
500 else
501 host->dir_status = DW_MCI_SEND_STATUS;
502
503 if (dw_mci_submit_data_dma(host, data)) {
504 int flags = SG_MITER_ATOMIC;
505 if (host->data->flags & MMC_DATA_READ)
506 flags |= SG_MITER_TO_SG;
507 else
508 flags |= SG_MITER_FROM_SG;
509
510 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
511 host->sg = data->sg;
512 host->part_buf_start = 0;
513 host->part_buf_count = 0;
514
515 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
516 temp = mci_readl(host, INTMASK);
517 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
518 mci_writel(host, INTMASK, temp);
519
520 temp = mci_readl(host, CTRL);
521 temp &= ~SDMMC_CTRL_DMA_ENABLE;
522 mci_writel(host, CTRL, temp);
523 }
524 }
525
526 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
527 {
528 struct dw_mci *host = slot->host;
529 unsigned long timeout = jiffies + msecs_to_jiffies(500);
530 unsigned int cmd_status = 0;
531
532 mci_writel(host, CMDARG, arg);
533 wmb();
534 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
535
536 while (time_before(jiffies, timeout)) {
537 cmd_status = mci_readl(host, CMD);
538 if (!(cmd_status & SDMMC_CMD_START))
539 return;
540 }
541 dev_err(&slot->mmc->class_dev,
542 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
543 cmd, arg, cmd_status);
544 }
545
546 static void dw_mci_setup_bus(struct dw_mci_slot *slot)
547 {
548 struct dw_mci *host = slot->host;
549 u32 div;
550
551 if (slot->clock != host->current_speed) {
552 if (host->bus_hz % slot->clock)
553 /*
554 * move the + 1 after the divide to prevent
555 * over-clocking the card.
556 */
557 div = ((host->bus_hz / slot->clock) >> 1) + 1;
558 else
559 div = (host->bus_hz / slot->clock) >> 1;
560
561 dev_info(&slot->mmc->class_dev,
562 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
563 " div = %d)\n", slot->id, host->bus_hz, slot->clock,
564 div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
565
566 /* disable clock */
567 mci_writel(host, CLKENA, 0);
568 mci_writel(host, CLKSRC, 0);
569
570 /* inform CIU */
571 mci_send_cmd(slot,
572 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
573
574 /* set clock to desired speed */
575 mci_writel(host, CLKDIV, div);
576
577 /* inform CIU */
578 mci_send_cmd(slot,
579 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
580
581 /* enable clock */
582 mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE |
583 SDMMC_CLKEN_LOW_PWR);
584
585 /* inform CIU */
586 mci_send_cmd(slot,
587 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
588
589 host->current_speed = slot->clock;
590 }
591
592 /* Set the current slot bus width */
593 mci_writel(host, CTYPE, (slot->ctype << slot->id));
594 }
595
596 static void __dw_mci_start_request(struct dw_mci *host,
597 struct dw_mci_slot *slot,
598 struct mmc_command *cmd)
599 {
600 struct mmc_request *mrq;
601 struct mmc_data *data;
602 u32 cmdflags;
603
604 mrq = slot->mrq;
605 if (host->pdata->select_slot)
606 host->pdata->select_slot(slot->id);
607
608 /* Slot specific timing and width adjustment */
609 dw_mci_setup_bus(slot);
610
611 host->cur_slot = slot;
612 host->mrq = mrq;
613
614 host->pending_events = 0;
615 host->completed_events = 0;
616 host->data_status = 0;
617
618 data = cmd->data;
619 if (data) {
620 dw_mci_set_timeout(host);
621 mci_writel(host, BYTCNT, data->blksz*data->blocks);
622 mci_writel(host, BLKSIZ, data->blksz);
623 }
624
625 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
626
627 /* this is the first command, send the initialization clock */
628 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
629 cmdflags |= SDMMC_CMD_INIT;
630
631 if (data) {
632 dw_mci_submit_data(host, data);
633 wmb();
634 }
635
636 dw_mci_start_command(host, cmd, cmdflags);
637
638 if (mrq->stop)
639 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
640 }
641
642 static void dw_mci_start_request(struct dw_mci *host,
643 struct dw_mci_slot *slot)
644 {
645 struct mmc_request *mrq = slot->mrq;
646 struct mmc_command *cmd;
647
648 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
649 __dw_mci_start_request(host, slot, cmd);
650 }
651
652 /* must be called with host->lock held */
653 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
654 struct mmc_request *mrq)
655 {
656 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
657 host->state);
658
659 slot->mrq = mrq;
660
661 if (host->state == STATE_IDLE) {
662 host->state = STATE_SENDING_CMD;
663 dw_mci_start_request(host, slot);
664 } else {
665 list_add_tail(&slot->queue_node, &host->queue);
666 }
667 }
668
669 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
670 {
671 struct dw_mci_slot *slot = mmc_priv(mmc);
672 struct dw_mci *host = slot->host;
673
674 WARN_ON(slot->mrq);
675
676 /*
677 * The check for card presence and queueing of the request must be
678 * atomic, otherwise the card could be removed in between and the
679 * request wouldn't fail until another card was inserted.
680 */
681 spin_lock_bh(&host->lock);
682
683 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
684 spin_unlock_bh(&host->lock);
685 mrq->cmd->error = -ENOMEDIUM;
686 mmc_request_done(mmc, mrq);
687 return;
688 }
689
690 dw_mci_queue_request(host, slot, mrq);
691
692 spin_unlock_bh(&host->lock);
693 }
694
695 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
696 {
697 struct dw_mci_slot *slot = mmc_priv(mmc);
698 u32 regs;
699
700 /* set default 1 bit mode */
701 slot->ctype = SDMMC_CTYPE_1BIT;
702
703 switch (ios->bus_width) {
704 case MMC_BUS_WIDTH_1:
705 slot->ctype = SDMMC_CTYPE_1BIT;
706 break;
707 case MMC_BUS_WIDTH_4:
708 slot->ctype = SDMMC_CTYPE_4BIT;
709 break;
710 case MMC_BUS_WIDTH_8:
711 slot->ctype = SDMMC_CTYPE_8BIT;
712 break;
713 }
714
715 regs = mci_readl(slot->host, UHS_REG);
716
717 /* DDR mode set */
718 if (ios->timing == MMC_TIMING_UHS_DDR50)
719 regs |= (0x1 << slot->id) << 16;
720 else
721 regs &= ~(0x1 << slot->id) << 16;
722
723 mci_writel(slot->host, UHS_REG, regs);
724
725 if (ios->clock) {
726 /*
727 * Use mirror of ios->clock to prevent race with mmc
728 * core ios update when finding the minimum.
729 */
730 slot->clock = ios->clock;
731 }
732
733 switch (ios->power_mode) {
734 case MMC_POWER_UP:
735 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
736 break;
737 default:
738 break;
739 }
740 }
741
742 static int dw_mci_get_ro(struct mmc_host *mmc)
743 {
744 int read_only;
745 struct dw_mci_slot *slot = mmc_priv(mmc);
746 struct dw_mci_board *brd = slot->host->pdata;
747
748 /* Use platform get_ro function, else try on board write protect */
749 if (brd->get_ro)
750 read_only = brd->get_ro(slot->id);
751 else
752 read_only =
753 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
754
755 dev_dbg(&mmc->class_dev, "card is %s\n",
756 read_only ? "read-only" : "read-write");
757
758 return read_only;
759 }
760
761 static int dw_mci_get_cd(struct mmc_host *mmc)
762 {
763 int present;
764 struct dw_mci_slot *slot = mmc_priv(mmc);
765 struct dw_mci_board *brd = slot->host->pdata;
766
767 /* Use platform get_cd function, else try onboard card detect */
768 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
769 present = 1;
770 else if (brd->get_cd)
771 present = !brd->get_cd(slot->id);
772 else
773 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
774 == 0 ? 1 : 0;
775
776 if (present)
777 dev_dbg(&mmc->class_dev, "card is present\n");
778 else
779 dev_dbg(&mmc->class_dev, "card is not present\n");
780
781 return present;
782 }
783
784 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
785 {
786 struct dw_mci_slot *slot = mmc_priv(mmc);
787 struct dw_mci *host = slot->host;
788 u32 int_mask;
789
790 /* Enable/disable Slot Specific SDIO interrupt */
791 int_mask = mci_readl(host, INTMASK);
792 if (enb) {
793 mci_writel(host, INTMASK,
794 (int_mask | (1 << SDMMC_INT_SDIO(slot->id))));
795 } else {
796 mci_writel(host, INTMASK,
797 (int_mask & ~(1 << SDMMC_INT_SDIO(slot->id))));
798 }
799 }
800
801 static const struct mmc_host_ops dw_mci_ops = {
802 .request = dw_mci_request,
803 .set_ios = dw_mci_set_ios,
804 .get_ro = dw_mci_get_ro,
805 .get_cd = dw_mci_get_cd,
806 .enable_sdio_irq = dw_mci_enable_sdio_irq,
807 };
808
809 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
810 __releases(&host->lock)
811 __acquires(&host->lock)
812 {
813 struct dw_mci_slot *slot;
814 struct mmc_host *prev_mmc = host->cur_slot->mmc;
815
816 WARN_ON(host->cmd || host->data);
817
818 host->cur_slot->mrq = NULL;
819 host->mrq = NULL;
820 if (!list_empty(&host->queue)) {
821 slot = list_entry(host->queue.next,
822 struct dw_mci_slot, queue_node);
823 list_del(&slot->queue_node);
824 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
825 mmc_hostname(slot->mmc));
826 host->state = STATE_SENDING_CMD;
827 dw_mci_start_request(host, slot);
828 } else {
829 dev_vdbg(&host->pdev->dev, "list empty\n");
830 host->state = STATE_IDLE;
831 }
832
833 spin_unlock(&host->lock);
834 mmc_request_done(prev_mmc, mrq);
835 spin_lock(&host->lock);
836 }
837
838 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
839 {
840 u32 status = host->cmd_status;
841
842 host->cmd_status = 0;
843
844 /* Read the response from the card (up to 16 bytes) */
845 if (cmd->flags & MMC_RSP_PRESENT) {
846 if (cmd->flags & MMC_RSP_136) {
847 cmd->resp[3] = mci_readl(host, RESP0);
848 cmd->resp[2] = mci_readl(host, RESP1);
849 cmd->resp[1] = mci_readl(host, RESP2);
850 cmd->resp[0] = mci_readl(host, RESP3);
851 } else {
852 cmd->resp[0] = mci_readl(host, RESP0);
853 cmd->resp[1] = 0;
854 cmd->resp[2] = 0;
855 cmd->resp[3] = 0;
856 }
857 }
858
859 if (status & SDMMC_INT_RTO)
860 cmd->error = -ETIMEDOUT;
861 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
862 cmd->error = -EILSEQ;
863 else if (status & SDMMC_INT_RESP_ERR)
864 cmd->error = -EIO;
865 else
866 cmd->error = 0;
867
868 if (cmd->error) {
869 /* newer ip versions need a delay between retries */
870 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
871 mdelay(20);
872
873 if (cmd->data) {
874 host->data = NULL;
875 dw_mci_stop_dma(host);
876 }
877 }
878 }
879
880 static void dw_mci_tasklet_func(unsigned long priv)
881 {
882 struct dw_mci *host = (struct dw_mci *)priv;
883 struct mmc_data *data;
884 struct mmc_command *cmd;
885 enum dw_mci_state state;
886 enum dw_mci_state prev_state;
887 u32 status, ctrl;
888
889 spin_lock(&host->lock);
890
891 state = host->state;
892 data = host->data;
893
894 do {
895 prev_state = state;
896
897 switch (state) {
898 case STATE_IDLE:
899 break;
900
901 case STATE_SENDING_CMD:
902 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
903 &host->pending_events))
904 break;
905
906 cmd = host->cmd;
907 host->cmd = NULL;
908 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
909 dw_mci_command_complete(host, cmd);
910 if (cmd == host->mrq->sbc && !cmd->error) {
911 prev_state = state = STATE_SENDING_CMD;
912 __dw_mci_start_request(host, host->cur_slot,
913 host->mrq->cmd);
914 goto unlock;
915 }
916
917 if (!host->mrq->data || cmd->error) {
918 dw_mci_request_end(host, host->mrq);
919 goto unlock;
920 }
921
922 prev_state = state = STATE_SENDING_DATA;
923 /* fall through */
924
925 case STATE_SENDING_DATA:
926 if (test_and_clear_bit(EVENT_DATA_ERROR,
927 &host->pending_events)) {
928 dw_mci_stop_dma(host);
929 if (data->stop)
930 send_stop_cmd(host, data);
931 state = STATE_DATA_ERROR;
932 break;
933 }
934
935 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
936 &host->pending_events))
937 break;
938
939 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
940 prev_state = state = STATE_DATA_BUSY;
941 /* fall through */
942
943 case STATE_DATA_BUSY:
944 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
945 &host->pending_events))
946 break;
947
948 host->data = NULL;
949 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
950 status = host->data_status;
951
952 if (status & DW_MCI_DATA_ERROR_FLAGS) {
953 if (status & SDMMC_INT_DTO) {
954 data->error = -ETIMEDOUT;
955 } else if (status & SDMMC_INT_DCRC) {
956 data->error = -EILSEQ;
957 } else if (status & SDMMC_INT_EBE &&
958 host->dir_status ==
959 DW_MCI_SEND_STATUS) {
960 /*
961 * No data CRC status was returned.
962 * The number of bytes transferred will
963 * be exaggerated in PIO mode.
964 */
965 data->bytes_xfered = 0;
966 data->error = -ETIMEDOUT;
967 } else {
968 dev_err(&host->pdev->dev,
969 "data FIFO error "
970 "(status=%08x)\n",
971 status);
972 data->error = -EIO;
973 }
974 /*
975 * After an error, there may be data lingering
976 * in the FIFO, so reset it - doing so
977 * generates a block interrupt, hence setting
978 * the scatter-gather pointer to NULL.
979 */
980 sg_miter_stop(&host->sg_miter);
981 host->sg = NULL;
982 ctrl = mci_readl(host, CTRL);
983 ctrl |= SDMMC_CTRL_FIFO_RESET;
984 mci_writel(host, CTRL, ctrl);
985 } else {
986 data->bytes_xfered = data->blocks * data->blksz;
987 data->error = 0;
988 }
989
990 if (!data->stop) {
991 dw_mci_request_end(host, host->mrq);
992 goto unlock;
993 }
994
995 if (host->mrq->sbc && !data->error) {
996 data->stop->error = 0;
997 dw_mci_request_end(host, host->mrq);
998 goto unlock;
999 }
1000
1001 prev_state = state = STATE_SENDING_STOP;
1002 if (!data->error)
1003 send_stop_cmd(host, data);
1004 /* fall through */
1005
1006 case STATE_SENDING_STOP:
1007 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1008 &host->pending_events))
1009 break;
1010
1011 host->cmd = NULL;
1012 dw_mci_command_complete(host, host->mrq->stop);
1013 dw_mci_request_end(host, host->mrq);
1014 goto unlock;
1015
1016 case STATE_DATA_ERROR:
1017 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1018 &host->pending_events))
1019 break;
1020
1021 state = STATE_DATA_BUSY;
1022 break;
1023 }
1024 } while (state != prev_state);
1025
1026 host->state = state;
1027 unlock:
1028 spin_unlock(&host->lock);
1029
1030 }
1031
1032 /* push final bytes to part_buf, only use during push */
1033 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1034 {
1035 memcpy((void *)&host->part_buf, buf, cnt);
1036 host->part_buf_count = cnt;
1037 }
1038
1039 /* append bytes to part_buf, only use during push */
1040 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1041 {
1042 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1043 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1044 host->part_buf_count += cnt;
1045 return cnt;
1046 }
1047
1048 /* pull first bytes from part_buf, only use during pull */
1049 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1050 {
1051 cnt = min(cnt, (int)host->part_buf_count);
1052 if (cnt) {
1053 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1054 cnt);
1055 host->part_buf_count -= cnt;
1056 host->part_buf_start += cnt;
1057 }
1058 return cnt;
1059 }
1060
1061 /* pull final bytes from the part_buf, assuming it's just been filled */
1062 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1063 {
1064 memcpy(buf, &host->part_buf, cnt);
1065 host->part_buf_start = cnt;
1066 host->part_buf_count = (1 << host->data_shift) - cnt;
1067 }
1068
1069 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1070 {
1071 /* try and push anything in the part_buf */
1072 if (unlikely(host->part_buf_count)) {
1073 int len = dw_mci_push_part_bytes(host, buf, cnt);
1074 buf += len;
1075 cnt -= len;
1076 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1077 mci_writew(host, DATA(host->data_offset),
1078 host->part_buf16);
1079 host->part_buf_count = 0;
1080 }
1081 }
1082 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1083 if (unlikely((unsigned long)buf & 0x1)) {
1084 while (cnt >= 2) {
1085 u16 aligned_buf[64];
1086 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1087 int items = len >> 1;
1088 int i;
1089 /* memcpy from input buffer into aligned buffer */
1090 memcpy(aligned_buf, buf, len);
1091 buf += len;
1092 cnt -= len;
1093 /* push data from aligned buffer into fifo */
1094 for (i = 0; i < items; ++i)
1095 mci_writew(host, DATA(host->data_offset),
1096 aligned_buf[i]);
1097 }
1098 } else
1099 #endif
1100 {
1101 u16 *pdata = buf;
1102 for (; cnt >= 2; cnt -= 2)
1103 mci_writew(host, DATA(host->data_offset), *pdata++);
1104 buf = pdata;
1105 }
1106 /* put anything remaining in the part_buf */
1107 if (cnt) {
1108 dw_mci_set_part_bytes(host, buf, cnt);
1109 if (!sg_next(host->sg))
1110 mci_writew(host, DATA(host->data_offset),
1111 host->part_buf16);
1112 }
1113 }
1114
1115 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1116 {
1117 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1118 if (unlikely((unsigned long)buf & 0x1)) {
1119 while (cnt >= 2) {
1120 /* pull data from fifo into aligned buffer */
1121 u16 aligned_buf[64];
1122 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1123 int items = len >> 1;
1124 int i;
1125 for (i = 0; i < items; ++i)
1126 aligned_buf[i] = mci_readw(host,
1127 DATA(host->data_offset));
1128 /* memcpy from aligned buffer into output buffer */
1129 memcpy(buf, aligned_buf, len);
1130 buf += len;
1131 cnt -= len;
1132 }
1133 } else
1134 #endif
1135 {
1136 u16 *pdata = buf;
1137 for (; cnt >= 2; cnt -= 2)
1138 *pdata++ = mci_readw(host, DATA(host->data_offset));
1139 buf = pdata;
1140 }
1141 if (cnt) {
1142 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1143 dw_mci_pull_final_bytes(host, buf, cnt);
1144 }
1145 }
1146
1147 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1148 {
1149 /* try and push anything in the part_buf */
1150 if (unlikely(host->part_buf_count)) {
1151 int len = dw_mci_push_part_bytes(host, buf, cnt);
1152 buf += len;
1153 cnt -= len;
1154 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1155 mci_writel(host, DATA(host->data_offset),
1156 host->part_buf32);
1157 host->part_buf_count = 0;
1158 }
1159 }
1160 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1161 if (unlikely((unsigned long)buf & 0x3)) {
1162 while (cnt >= 4) {
1163 u32 aligned_buf[32];
1164 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1165 int items = len >> 2;
1166 int i;
1167 /* memcpy from input buffer into aligned buffer */
1168 memcpy(aligned_buf, buf, len);
1169 buf += len;
1170 cnt -= len;
1171 /* push data from aligned buffer into fifo */
1172 for (i = 0; i < items; ++i)
1173 mci_writel(host, DATA(host->data_offset),
1174 aligned_buf[i]);
1175 }
1176 } else
1177 #endif
1178 {
1179 u32 *pdata = buf;
1180 for (; cnt >= 4; cnt -= 4)
1181 mci_writel(host, DATA(host->data_offset), *pdata++);
1182 buf = pdata;
1183 }
1184 /* put anything remaining in the part_buf */
1185 if (cnt) {
1186 dw_mci_set_part_bytes(host, buf, cnt);
1187 if (!sg_next(host->sg))
1188 mci_writel(host, DATA(host->data_offset),
1189 host->part_buf32);
1190 }
1191 }
1192
1193 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1194 {
1195 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1196 if (unlikely((unsigned long)buf & 0x3)) {
1197 while (cnt >= 4) {
1198 /* pull data from fifo into aligned buffer */
1199 u32 aligned_buf[32];
1200 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1201 int items = len >> 2;
1202 int i;
1203 for (i = 0; i < items; ++i)
1204 aligned_buf[i] = mci_readl(host,
1205 DATA(host->data_offset));
1206 /* memcpy from aligned buffer into output buffer */
1207 memcpy(buf, aligned_buf, len);
1208 buf += len;
1209 cnt -= len;
1210 }
1211 } else
1212 #endif
1213 {
1214 u32 *pdata = buf;
1215 for (; cnt >= 4; cnt -= 4)
1216 *pdata++ = mci_readl(host, DATA(host->data_offset));
1217 buf = pdata;
1218 }
1219 if (cnt) {
1220 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1221 dw_mci_pull_final_bytes(host, buf, cnt);
1222 }
1223 }
1224
1225 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1226 {
1227 /* try and push anything in the part_buf */
1228 if (unlikely(host->part_buf_count)) {
1229 int len = dw_mci_push_part_bytes(host, buf, cnt);
1230 buf += len;
1231 cnt -= len;
1232 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1233 mci_writew(host, DATA(host->data_offset),
1234 host->part_buf);
1235 host->part_buf_count = 0;
1236 }
1237 }
1238 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1239 if (unlikely((unsigned long)buf & 0x7)) {
1240 while (cnt >= 8) {
1241 u64 aligned_buf[16];
1242 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1243 int items = len >> 3;
1244 int i;
1245 /* memcpy from input buffer into aligned buffer */
1246 memcpy(aligned_buf, buf, len);
1247 buf += len;
1248 cnt -= len;
1249 /* push data from aligned buffer into fifo */
1250 for (i = 0; i < items; ++i)
1251 mci_writeq(host, DATA(host->data_offset),
1252 aligned_buf[i]);
1253 }
1254 } else
1255 #endif
1256 {
1257 u64 *pdata = buf;
1258 for (; cnt >= 8; cnt -= 8)
1259 mci_writeq(host, DATA(host->data_offset), *pdata++);
1260 buf = pdata;
1261 }
1262 /* put anything remaining in the part_buf */
1263 if (cnt) {
1264 dw_mci_set_part_bytes(host, buf, cnt);
1265 if (!sg_next(host->sg))
1266 mci_writeq(host, DATA(host->data_offset),
1267 host->part_buf);
1268 }
1269 }
1270
1271 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1272 {
1273 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1274 if (unlikely((unsigned long)buf & 0x7)) {
1275 while (cnt >= 8) {
1276 /* pull data from fifo into aligned buffer */
1277 u64 aligned_buf[16];
1278 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1279 int items = len >> 3;
1280 int i;
1281 for (i = 0; i < items; ++i)
1282 aligned_buf[i] = mci_readq(host,
1283 DATA(host->data_offset));
1284 /* memcpy from aligned buffer into output buffer */
1285 memcpy(buf, aligned_buf, len);
1286 buf += len;
1287 cnt -= len;
1288 }
1289 } else
1290 #endif
1291 {
1292 u64 *pdata = buf;
1293 for (; cnt >= 8; cnt -= 8)
1294 *pdata++ = mci_readq(host, DATA(host->data_offset));
1295 buf = pdata;
1296 }
1297 if (cnt) {
1298 host->part_buf = mci_readq(host, DATA(host->data_offset));
1299 dw_mci_pull_final_bytes(host, buf, cnt);
1300 }
1301 }
1302
1303 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1304 {
1305 int len;
1306
1307 /* get remaining partial bytes */
1308 len = dw_mci_pull_part_bytes(host, buf, cnt);
1309 if (unlikely(len == cnt))
1310 return;
1311 buf += len;
1312 cnt -= len;
1313
1314 /* get the rest of the data */
1315 host->pull_data(host, buf, cnt);
1316 }
1317
1318 static void dw_mci_read_data_pio(struct dw_mci *host)
1319 {
1320 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1321 void *buf;
1322 unsigned int offset;
1323 struct mmc_data *data = host->data;
1324 int shift = host->data_shift;
1325 u32 status;
1326 unsigned int nbytes = 0, len;
1327 unsigned int remain, fcnt;
1328
1329 do {
1330 if (!sg_miter_next(sg_miter))
1331 goto done;
1332
1333 host->sg = sg_miter->__sg;
1334 buf = sg_miter->addr;
1335 remain = sg_miter->length;
1336 offset = 0;
1337
1338 do {
1339 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1340 << shift) + host->part_buf_count;
1341 len = min(remain, fcnt);
1342 if (!len)
1343 break;
1344 dw_mci_pull_data(host, (void *)(buf + offset), len);
1345 offset += len;
1346 nbytes += len;
1347 remain -= len;
1348 } while (remain);
1349 sg_miter->consumed = offset;
1350
1351 status = mci_readl(host, MINTSTS);
1352 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1353 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1354 host->data_status = status;
1355 data->bytes_xfered += nbytes;
1356 sg_miter_stop(sg_miter);
1357 host->sg = NULL;
1358 smp_wmb();
1359
1360 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1361
1362 tasklet_schedule(&host->tasklet);
1363 return;
1364 }
1365 } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1366 data->bytes_xfered += nbytes;
1367
1368 if (!remain) {
1369 if (!sg_miter_next(sg_miter))
1370 goto done;
1371 sg_miter->consumed = 0;
1372 }
1373 sg_miter_stop(sg_miter);
1374 return;
1375
1376 done:
1377 data->bytes_xfered += nbytes;
1378 sg_miter_stop(sg_miter);
1379 host->sg = NULL;
1380 smp_wmb();
1381 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1382 }
1383
1384 static void dw_mci_write_data_pio(struct dw_mci *host)
1385 {
1386 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1387 void *buf;
1388 unsigned int offset;
1389 struct mmc_data *data = host->data;
1390 int shift = host->data_shift;
1391 u32 status;
1392 unsigned int nbytes = 0, len;
1393 unsigned int fifo_depth = host->fifo_depth;
1394 unsigned int remain, fcnt;
1395
1396 do {
1397 if (!sg_miter_next(sg_miter))
1398 goto done;
1399
1400 host->sg = sg_miter->__sg;
1401 buf = sg_miter->addr;
1402 remain = sg_miter->length;
1403 offset = 0;
1404
1405 do {
1406 fcnt = ((fifo_depth -
1407 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1408 << shift) - host->part_buf_count;
1409 len = min(remain, fcnt);
1410 if (!len)
1411 break;
1412 host->push_data(host, (void *)(buf + offset), len);
1413 offset += len;
1414 nbytes += len;
1415 remain -= len;
1416 } while (remain);
1417 sg_miter->consumed = offset;
1418
1419 status = mci_readl(host, MINTSTS);
1420 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1421 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1422 host->data_status = status;
1423 data->bytes_xfered += nbytes;
1424 sg_miter_stop(sg_miter);
1425 host->sg = NULL;
1426
1427 smp_wmb();
1428
1429 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1430
1431 tasklet_schedule(&host->tasklet);
1432 return;
1433 }
1434 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1435 data->bytes_xfered += nbytes;
1436
1437 if (!remain) {
1438 if (!sg_miter_next(sg_miter))
1439 goto done;
1440 sg_miter->consumed = 0;
1441 }
1442 sg_miter_stop(sg_miter);
1443 return;
1444
1445 done:
1446 data->bytes_xfered += nbytes;
1447 sg_miter_stop(sg_miter);
1448 host->sg = NULL;
1449 smp_wmb();
1450 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1451 }
1452
1453 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1454 {
1455 if (!host->cmd_status)
1456 host->cmd_status = status;
1457
1458 smp_wmb();
1459
1460 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1461 tasklet_schedule(&host->tasklet);
1462 }
1463
1464 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1465 {
1466 struct dw_mci *host = dev_id;
1467 u32 status, pending;
1468 unsigned int pass_count = 0;
1469 int i;
1470
1471 do {
1472 status = mci_readl(host, RINTSTS);
1473 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1474
1475 /*
1476 * DTO fix - version 2.10a and below, and only if internal DMA
1477 * is configured.
1478 */
1479 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1480 if (!pending &&
1481 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1482 pending |= SDMMC_INT_DATA_OVER;
1483 }
1484
1485 if (!pending)
1486 break;
1487
1488 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1489 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1490 host->cmd_status = status;
1491 smp_wmb();
1492 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1493 }
1494
1495 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1496 /* if there is an error report DATA_ERROR */
1497 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1498 host->data_status = status;
1499 smp_wmb();
1500 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1501 if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
1502 SDMMC_INT_SBE | SDMMC_INT_EBE)))
1503 tasklet_schedule(&host->tasklet);
1504 }
1505
1506 if (pending & SDMMC_INT_DATA_OVER) {
1507 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1508 if (!host->data_status)
1509 host->data_status = status;
1510 smp_wmb();
1511 if (host->dir_status == DW_MCI_RECV_STATUS) {
1512 if (host->sg != NULL)
1513 dw_mci_read_data_pio(host);
1514 }
1515 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1516 tasklet_schedule(&host->tasklet);
1517 }
1518
1519 if (pending & SDMMC_INT_RXDR) {
1520 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1521 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1522 dw_mci_read_data_pio(host);
1523 }
1524
1525 if (pending & SDMMC_INT_TXDR) {
1526 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1527 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1528 dw_mci_write_data_pio(host);
1529 }
1530
1531 if (pending & SDMMC_INT_CMD_DONE) {
1532 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1533 dw_mci_cmd_interrupt(host, status);
1534 }
1535
1536 if (pending & SDMMC_INT_CD) {
1537 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1538 queue_work(dw_mci_card_workqueue, &host->card_work);
1539 }
1540
1541 /* Handle SDIO Interrupts */
1542 for (i = 0; i < host->num_slots; i++) {
1543 struct dw_mci_slot *slot = host->slot[i];
1544 if (pending & SDMMC_INT_SDIO(i)) {
1545 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1546 mmc_signal_sdio_irq(slot->mmc);
1547 }
1548 }
1549
1550 } while (pass_count++ < 5);
1551
1552 #ifdef CONFIG_MMC_DW_IDMAC
1553 /* Handle DMA interrupts */
1554 pending = mci_readl(host, IDSTS);
1555 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1556 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1557 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1558 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1559 host->dma_ops->complete(host);
1560 }
1561 #endif
1562
1563 return IRQ_HANDLED;
1564 }
1565
1566 static void dw_mci_work_routine_card(struct work_struct *work)
1567 {
1568 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1569 int i;
1570
1571 for (i = 0; i < host->num_slots; i++) {
1572 struct dw_mci_slot *slot = host->slot[i];
1573 struct mmc_host *mmc = slot->mmc;
1574 struct mmc_request *mrq;
1575 int present;
1576 u32 ctrl;
1577
1578 present = dw_mci_get_cd(mmc);
1579 while (present != slot->last_detect_state) {
1580 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1581 present ? "inserted" : "removed");
1582
1583 /* Power up slot (before spin_lock, may sleep) */
1584 if (present != 0 && host->pdata->setpower)
1585 host->pdata->setpower(slot->id, mmc->ocr_avail);
1586
1587 spin_lock_bh(&host->lock);
1588
1589 /* Card change detected */
1590 slot->last_detect_state = present;
1591
1592 /* Mark card as present if applicable */
1593 if (present != 0)
1594 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1595
1596 /* Clean up queue if present */
1597 mrq = slot->mrq;
1598 if (mrq) {
1599 if (mrq == host->mrq) {
1600 host->data = NULL;
1601 host->cmd = NULL;
1602
1603 switch (host->state) {
1604 case STATE_IDLE:
1605 break;
1606 case STATE_SENDING_CMD:
1607 mrq->cmd->error = -ENOMEDIUM;
1608 if (!mrq->data)
1609 break;
1610 /* fall through */
1611 case STATE_SENDING_DATA:
1612 mrq->data->error = -ENOMEDIUM;
1613 dw_mci_stop_dma(host);
1614 break;
1615 case STATE_DATA_BUSY:
1616 case STATE_DATA_ERROR:
1617 if (mrq->data->error == -EINPROGRESS)
1618 mrq->data->error = -ENOMEDIUM;
1619 if (!mrq->stop)
1620 break;
1621 /* fall through */
1622 case STATE_SENDING_STOP:
1623 mrq->stop->error = -ENOMEDIUM;
1624 break;
1625 }
1626
1627 dw_mci_request_end(host, mrq);
1628 } else {
1629 list_del(&slot->queue_node);
1630 mrq->cmd->error = -ENOMEDIUM;
1631 if (mrq->data)
1632 mrq->data->error = -ENOMEDIUM;
1633 if (mrq->stop)
1634 mrq->stop->error = -ENOMEDIUM;
1635
1636 spin_unlock(&host->lock);
1637 mmc_request_done(slot->mmc, mrq);
1638 spin_lock(&host->lock);
1639 }
1640 }
1641
1642 /* Power down slot */
1643 if (present == 0) {
1644 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1645
1646 /*
1647 * Clear down the FIFO - doing so generates a
1648 * block interrupt, hence setting the
1649 * scatter-gather pointer to NULL.
1650 */
1651 sg_miter_stop(&host->sg_miter);
1652 host->sg = NULL;
1653
1654 ctrl = mci_readl(host, CTRL);
1655 ctrl |= SDMMC_CTRL_FIFO_RESET;
1656 mci_writel(host, CTRL, ctrl);
1657
1658 #ifdef CONFIG_MMC_DW_IDMAC
1659 ctrl = mci_readl(host, BMOD);
1660 ctrl |= 0x01; /* Software reset of DMA */
1661 mci_writel(host, BMOD, ctrl);
1662 #endif
1663
1664 }
1665
1666 spin_unlock_bh(&host->lock);
1667
1668 /* Power down slot (after spin_unlock, may sleep) */
1669 if (present == 0 && host->pdata->setpower)
1670 host->pdata->setpower(slot->id, 0);
1671
1672 present = dw_mci_get_cd(mmc);
1673 }
1674
1675 mmc_detect_change(slot->mmc,
1676 msecs_to_jiffies(host->pdata->detect_delay_ms));
1677 }
1678 }
1679
1680 static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1681 {
1682 struct mmc_host *mmc;
1683 struct dw_mci_slot *slot;
1684
1685 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
1686 if (!mmc)
1687 return -ENOMEM;
1688
1689 slot = mmc_priv(mmc);
1690 slot->id = id;
1691 slot->mmc = mmc;
1692 slot->host = host;
1693
1694 mmc->ops = &dw_mci_ops;
1695 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1696 mmc->f_max = host->bus_hz;
1697
1698 if (host->pdata->get_ocr)
1699 mmc->ocr_avail = host->pdata->get_ocr(id);
1700 else
1701 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1702
1703 /*
1704 * Start with slot power disabled, it will be enabled when a card
1705 * is detected.
1706 */
1707 if (host->pdata->setpower)
1708 host->pdata->setpower(id, 0);
1709
1710 if (host->pdata->caps)
1711 mmc->caps = host->pdata->caps;
1712
1713 if (host->pdata->caps2)
1714 mmc->caps2 = host->pdata->caps2;
1715
1716 if (host->pdata->get_bus_wd)
1717 if (host->pdata->get_bus_wd(slot->id) >= 4)
1718 mmc->caps |= MMC_CAP_4_BIT_DATA;
1719
1720 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1721 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1722
1723 #ifdef CONFIG_MMC_DW_IDMAC
1724 mmc->max_segs = host->ring_size;
1725 mmc->max_blk_size = 65536;
1726 mmc->max_blk_count = host->ring_size;
1727 mmc->max_seg_size = 0x1000;
1728 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1729 #else
1730 if (host->pdata->blk_settings) {
1731 mmc->max_segs = host->pdata->blk_settings->max_segs;
1732 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1733 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1734 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1735 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1736 } else {
1737 /* Useful defaults if platform data is unset. */
1738 mmc->max_segs = 64;
1739 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1740 mmc->max_blk_count = 512;
1741 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1742 mmc->max_seg_size = mmc->max_req_size;
1743 }
1744 #endif /* CONFIG_MMC_DW_IDMAC */
1745
1746 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1747 if (IS_ERR(host->vmmc)) {
1748 pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
1749 host->vmmc = NULL;
1750 } else
1751 regulator_enable(host->vmmc);
1752
1753 if (dw_mci_get_cd(mmc))
1754 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1755 else
1756 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1757
1758 host->slot[id] = slot;
1759 mmc_add_host(mmc);
1760
1761 #if defined(CONFIG_DEBUG_FS)
1762 dw_mci_init_debugfs(slot);
1763 #endif
1764
1765 /* Card initially undetected */
1766 slot->last_detect_state = 0;
1767
1768 /*
1769 * Card may have been plugged in prior to boot so we
1770 * need to run the detect tasklet
1771 */
1772 queue_work(dw_mci_card_workqueue, &host->card_work);
1773
1774 return 0;
1775 }
1776
1777 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
1778 {
1779 /* Shutdown detect IRQ */
1780 if (slot->host->pdata->exit)
1781 slot->host->pdata->exit(id);
1782
1783 /* Debugfs stuff is cleaned up by mmc core */
1784 mmc_remove_host(slot->mmc);
1785 slot->host->slot[id] = NULL;
1786 mmc_free_host(slot->mmc);
1787 }
1788
1789 static void dw_mci_init_dma(struct dw_mci *host)
1790 {
1791 /* Alloc memory for sg translation */
1792 host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
1793 &host->sg_dma, GFP_KERNEL);
1794 if (!host->sg_cpu) {
1795 dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
1796 __func__);
1797 goto no_dma;
1798 }
1799
1800 /* Determine which DMA interface to use */
1801 #ifdef CONFIG_MMC_DW_IDMAC
1802 host->dma_ops = &dw_mci_idmac_ops;
1803 dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
1804 #endif
1805
1806 if (!host->dma_ops)
1807 goto no_dma;
1808
1809 if (host->dma_ops->init) {
1810 if (host->dma_ops->init(host)) {
1811 dev_err(&host->pdev->dev, "%s: Unable to initialize "
1812 "DMA Controller.\n", __func__);
1813 goto no_dma;
1814 }
1815 } else {
1816 dev_err(&host->pdev->dev, "DMA initialization not found.\n");
1817 goto no_dma;
1818 }
1819
1820 host->use_dma = 1;
1821 return;
1822
1823 no_dma:
1824 dev_info(&host->pdev->dev, "Using PIO mode.\n");
1825 host->use_dma = 0;
1826 return;
1827 }
1828
1829 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
1830 {
1831 unsigned long timeout = jiffies + msecs_to_jiffies(500);
1832 unsigned int ctrl;
1833
1834 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1835 SDMMC_CTRL_DMA_RESET));
1836
1837 /* wait till resets clear */
1838 do {
1839 ctrl = mci_readl(host, CTRL);
1840 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1841 SDMMC_CTRL_DMA_RESET)))
1842 return true;
1843 } while (time_before(jiffies, timeout));
1844
1845 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
1846
1847 return false;
1848 }
1849
1850 static int dw_mci_probe(struct platform_device *pdev)
1851 {
1852 struct dw_mci *host;
1853 struct resource *regs;
1854 struct dw_mci_board *pdata;
1855 int irq, ret, i, width;
1856 u32 fifo_size;
1857
1858 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1859 if (!regs)
1860 return -ENXIO;
1861
1862 irq = platform_get_irq(pdev, 0);
1863 if (irq < 0)
1864 return irq;
1865
1866 host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
1867 if (!host)
1868 return -ENOMEM;
1869
1870 host->pdev = pdev;
1871 host->pdata = pdata = pdev->dev.platform_data;
1872 if (!pdata || !pdata->init) {
1873 dev_err(&pdev->dev,
1874 "Platform data must supply init function\n");
1875 ret = -ENODEV;
1876 goto err_freehost;
1877 }
1878
1879 if (!pdata->select_slot && pdata->num_slots > 1) {
1880 dev_err(&pdev->dev,
1881 "Platform data must supply select_slot function\n");
1882 ret = -ENODEV;
1883 goto err_freehost;
1884 }
1885
1886 if (!pdata->bus_hz) {
1887 dev_err(&pdev->dev,
1888 "Platform data must supply bus speed\n");
1889 ret = -ENODEV;
1890 goto err_freehost;
1891 }
1892
1893 host->bus_hz = pdata->bus_hz;
1894 host->quirks = pdata->quirks;
1895
1896 spin_lock_init(&host->lock);
1897 INIT_LIST_HEAD(&host->queue);
1898
1899 ret = -ENOMEM;
1900 host->regs = ioremap(regs->start, resource_size(regs));
1901 if (!host->regs)
1902 goto err_freehost;
1903
1904 host->dma_ops = pdata->dma_ops;
1905 dw_mci_init_dma(host);
1906
1907 /*
1908 * Get the host data width - this assumes that HCON has been set with
1909 * the correct values.
1910 */
1911 i = (mci_readl(host, HCON) >> 7) & 0x7;
1912 if (!i) {
1913 host->push_data = dw_mci_push_data16;
1914 host->pull_data = dw_mci_pull_data16;
1915 width = 16;
1916 host->data_shift = 1;
1917 } else if (i == 2) {
1918 host->push_data = dw_mci_push_data64;
1919 host->pull_data = dw_mci_pull_data64;
1920 width = 64;
1921 host->data_shift = 3;
1922 } else {
1923 /* Check for a reserved value, and warn if it is */
1924 WARN((i != 1),
1925 "HCON reports a reserved host data width!\n"
1926 "Defaulting to 32-bit access.\n");
1927 host->push_data = dw_mci_push_data32;
1928 host->pull_data = dw_mci_pull_data32;
1929 width = 32;
1930 host->data_shift = 2;
1931 }
1932
1933 /* Reset all blocks */
1934 if (!mci_wait_reset(&pdev->dev, host)) {
1935 ret = -ENODEV;
1936 goto err_dmaunmap;
1937 }
1938
1939 /* Clear the interrupts for the host controller */
1940 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1941 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1942
1943 /* Put in max timeout */
1944 mci_writel(host, TMOUT, 0xFFFFFFFF);
1945
1946 /*
1947 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
1948 * Tx Mark = fifo_size / 2 DMA Size = 8
1949 */
1950 if (!host->pdata->fifo_depth) {
1951 /*
1952 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
1953 * have been overwritten by the bootloader, just like we're
1954 * about to do, so if you know the value for your hardware, you
1955 * should put it in the platform data.
1956 */
1957 fifo_size = mci_readl(host, FIFOTH);
1958 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
1959 } else {
1960 fifo_size = host->pdata->fifo_depth;
1961 }
1962 host->fifo_depth = fifo_size;
1963 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
1964 ((fifo_size/2) << 0));
1965 mci_writel(host, FIFOTH, host->fifoth_val);
1966
1967 /* disable clock to CIU */
1968 mci_writel(host, CLKENA, 0);
1969 mci_writel(host, CLKSRC, 0);
1970
1971 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
1972 dw_mci_card_workqueue = alloc_workqueue("dw-mci-card",
1973 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
1974 if (!dw_mci_card_workqueue)
1975 goto err_dmaunmap;
1976 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
1977
1978 ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
1979 if (ret)
1980 goto err_workqueue;
1981
1982 platform_set_drvdata(pdev, host);
1983
1984 if (host->pdata->num_slots)
1985 host->num_slots = host->pdata->num_slots;
1986 else
1987 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
1988
1989 /* We need at least one slot to succeed */
1990 for (i = 0; i < host->num_slots; i++) {
1991 ret = dw_mci_init_slot(host, i);
1992 if (ret) {
1993 ret = -ENODEV;
1994 goto err_init_slot;
1995 }
1996 }
1997
1998 /*
1999 * In 2.40a spec, Data offset is changed.
2000 * Need to check the version-id and set data-offset for DATA register.
2001 */
2002 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2003 dev_info(&pdev->dev, "Version ID is %04x\n", host->verid);
2004
2005 if (host->verid < DW_MMC_240A)
2006 host->data_offset = DATA_OFFSET;
2007 else
2008 host->data_offset = DATA_240A_OFFSET;
2009
2010 /*
2011 * Enable interrupts for command done, data over, data empty, card det,
2012 * receive ready and error such as transmit, receive timeout, crc error
2013 */
2014 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2015 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2016 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2017 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2018 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2019
2020 dev_info(&pdev->dev, "DW MMC controller at irq %d, "
2021 "%d bit host data width, "
2022 "%u deep fifo\n",
2023 irq, width, fifo_size);
2024 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2025 dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
2026
2027 return 0;
2028
2029 err_init_slot:
2030 /* De-init any initialized slots */
2031 while (i > 0) {
2032 if (host->slot[i])
2033 dw_mci_cleanup_slot(host->slot[i], i);
2034 i--;
2035 }
2036 free_irq(irq, host);
2037
2038 err_workqueue:
2039 destroy_workqueue(dw_mci_card_workqueue);
2040
2041 err_dmaunmap:
2042 if (host->use_dma && host->dma_ops->exit)
2043 host->dma_ops->exit(host);
2044 dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
2045 host->sg_cpu, host->sg_dma);
2046 iounmap(host->regs);
2047
2048 if (host->vmmc) {
2049 regulator_disable(host->vmmc);
2050 regulator_put(host->vmmc);
2051 }
2052
2053
2054 err_freehost:
2055 kfree(host);
2056 return ret;
2057 }
2058
2059 static int __exit dw_mci_remove(struct platform_device *pdev)
2060 {
2061 struct dw_mci *host = platform_get_drvdata(pdev);
2062 int i;
2063
2064 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2065 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2066
2067 platform_set_drvdata(pdev, NULL);
2068
2069 for (i = 0; i < host->num_slots; i++) {
2070 dev_dbg(&pdev->dev, "remove slot %d\n", i);
2071 if (host->slot[i])
2072 dw_mci_cleanup_slot(host->slot[i], i);
2073 }
2074
2075 /* disable clock to CIU */
2076 mci_writel(host, CLKENA, 0);
2077 mci_writel(host, CLKSRC, 0);
2078
2079 free_irq(platform_get_irq(pdev, 0), host);
2080 destroy_workqueue(dw_mci_card_workqueue);
2081 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
2082
2083 if (host->use_dma && host->dma_ops->exit)
2084 host->dma_ops->exit(host);
2085
2086 if (host->vmmc) {
2087 regulator_disable(host->vmmc);
2088 regulator_put(host->vmmc);
2089 }
2090
2091 iounmap(host->regs);
2092
2093 kfree(host);
2094 return 0;
2095 }
2096
2097 #ifdef CONFIG_PM_SLEEP
2098 /*
2099 * TODO: we should probably disable the clock to the card in the suspend path.
2100 */
2101 static int dw_mci_suspend(struct device *dev)
2102 {
2103 int i, ret;
2104 struct dw_mci *host = dev_get_drvdata(dev);
2105
2106 for (i = 0; i < host->num_slots; i++) {
2107 struct dw_mci_slot *slot = host->slot[i];
2108 if (!slot)
2109 continue;
2110 ret = mmc_suspend_host(slot->mmc);
2111 if (ret < 0) {
2112 while (--i >= 0) {
2113 slot = host->slot[i];
2114 if (slot)
2115 mmc_resume_host(host->slot[i]->mmc);
2116 }
2117 return ret;
2118 }
2119 }
2120
2121 if (host->vmmc)
2122 regulator_disable(host->vmmc);
2123
2124 return 0;
2125 }
2126
2127 static int dw_mci_resume(struct device *dev)
2128 {
2129 int i, ret;
2130 struct dw_mci *host = dev_get_drvdata(dev);
2131
2132 if (host->vmmc)
2133 regulator_enable(host->vmmc);
2134
2135 if (host->dma_ops->init)
2136 host->dma_ops->init(host);
2137
2138 if (!mci_wait_reset(dev, host)) {
2139 ret = -ENODEV;
2140 return ret;
2141 }
2142
2143 /* Restore the old value at FIFOTH register */
2144 mci_writel(host, FIFOTH, host->fifoth_val);
2145
2146 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2147 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2148 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2149 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2150 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2151
2152 for (i = 0; i < host->num_slots; i++) {
2153 struct dw_mci_slot *slot = host->slot[i];
2154 if (!slot)
2155 continue;
2156 ret = mmc_resume_host(host->slot[i]->mmc);
2157 if (ret < 0)
2158 return ret;
2159 }
2160
2161 return 0;
2162 }
2163 #else
2164 #define dw_mci_suspend NULL
2165 #define dw_mci_resume NULL
2166 #endif /* CONFIG_PM_SLEEP */
2167
2168 static SIMPLE_DEV_PM_OPS(dw_mci_pmops, dw_mci_suspend, dw_mci_resume);
2169
2170 static struct platform_driver dw_mci_driver = {
2171 .remove = __exit_p(dw_mci_remove),
2172 .driver = {
2173 .name = "dw_mmc",
2174 .pm = &dw_mci_pmops,
2175 },
2176 };
2177
2178 static int __init dw_mci_init(void)
2179 {
2180 return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
2181 }
2182
2183 static void __exit dw_mci_exit(void)
2184 {
2185 platform_driver_unregister(&dw_mci_driver);
2186 }
2187
2188 module_init(dw_mci_init);
2189 module_exit(dw_mci_exit);
2190
2191 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2192 MODULE_AUTHOR("NXP Semiconductor VietNam");
2193 MODULE_AUTHOR("Imagination Technologies Ltd");
2194 MODULE_LICENSE("GPL v2");