projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'regulator-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[deliverable/linux.git] / drivers / mmc / host / dw_mmc.c
1 /*
2 * Synopsys DesignWare Multimedia Card Interface driver
3 * (Based on NXP driver for lpc 31xx)
4 *
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/blkdev.h>
15 #include <linux/clk.h>
16 #include <linux/debugfs.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/interrupt.h>
22 #include <linux/ioport.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
25 #include <linux/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 #if defined(CONFIG_DEBUG_FS)
104 static int dw_mci_req_show(struct seq_file *s, void *v)
105 {
106 struct dw_mci_slot *slot = s->private;
107 struct mmc_request *mrq;
108 struct mmc_command *cmd;
109 struct mmc_command *stop;
110 struct mmc_data *data;
111
112 /* Make sure we get a consistent snapshot */
113 spin_lock_bh(&slot->host->lock);
114 mrq = slot->mrq;
115
116 if (mrq) {
117 cmd = mrq->cmd;
118 data = mrq->data;
119 stop = mrq->stop;
120
121 if (cmd)
122 seq_printf(s,
123 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
124 cmd->opcode, cmd->arg, cmd->flags,
125 cmd->resp[0], cmd->resp[1], cmd->resp[2],
126 cmd->resp[2], cmd->error);
127 if (data)
128 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
129 data->bytes_xfered, data->blocks,
130 data->blksz, data->flags, data->error);
131 if (stop)
132 seq_printf(s,
133 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
134 stop->opcode, stop->arg, stop->flags,
135 stop->resp[0], stop->resp[1], stop->resp[2],
136 stop->resp[2], stop->error);
137 }
138
139 spin_unlock_bh(&slot->host->lock);
140
141 return 0;
142 }
143
144 static int dw_mci_req_open(struct inode *inode, struct file *file)
145 {
146 return single_open(file, dw_mci_req_show, inode->i_private);
147 }
148
149 static const struct file_operations dw_mci_req_fops = {
150 .owner = THIS_MODULE,
151 .open = dw_mci_req_open,
152 .read = seq_read,
153 .llseek = seq_lseek,
154 .release = single_release,
155 };
156
157 static int dw_mci_regs_show(struct seq_file *s, void *v)
158 {
159 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
160 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
161 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
162 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
163 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
164 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
165
166 return 0;
167 }
168
169 static int dw_mci_regs_open(struct inode *inode, struct file *file)
170 {
171 return single_open(file, dw_mci_regs_show, inode->i_private);
172 }
173
174 static const struct file_operations dw_mci_regs_fops = {
175 .owner = THIS_MODULE,
176 .open = dw_mci_regs_open,
177 .read = seq_read,
178 .llseek = seq_lseek,
179 .release = single_release,
180 };
181
182 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
183 {
184 struct mmc_host *mmc = slot->mmc;
185 struct dw_mci *host = slot->host;
186 struct dentry *root;
187 struct dentry *node;
188
189 root = mmc->debugfs_root;
190 if (!root)
191 return;
192
193 node = debugfs_create_file("regs", S_IRUSR, root, host,
194 &dw_mci_regs_fops);
195 if (!node)
196 goto err;
197
198 node = debugfs_create_file("req", S_IRUSR, root, slot,
199 &dw_mci_req_fops);
200 if (!node)
201 goto err;
202
203 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
204 if (!node)
205 goto err;
206
207 node = debugfs_create_x32("pending_events", S_IRUSR, root,
208 (u32 *)&host->pending_events);
209 if (!node)
210 goto err;
211
212 node = debugfs_create_x32("completed_events", S_IRUSR, root,
213 (u32 *)&host->completed_events);
214 if (!node)
215 goto err;
216
217 return;
218
219 err:
220 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
221 }
222 #endif /* defined(CONFIG_DEBUG_FS) */
223
224 static void dw_mci_set_timeout(struct dw_mci *host)
225 {
226 /* timeout (maximum) */
227 mci_writel(host, TMOUT, 0xffffffff);
228 }
229
230 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
231 {
232 struct mmc_data *data;
233 u32 cmdr;
234 cmd->error = -EINPROGRESS;
235
236 cmdr = cmd->opcode;
237
238 if (cmdr == MMC_STOP_TRANSMISSION)
239 cmdr |= SDMMC_CMD_STOP;
240 else
241 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
242
243 if (cmd->flags & MMC_RSP_PRESENT) {
244 /* We expect a response, so set this bit */
245 cmdr |= SDMMC_CMD_RESP_EXP;
246 if (cmd->flags & MMC_RSP_136)
247 cmdr |= SDMMC_CMD_RESP_LONG;
248 }
249
250 if (cmd->flags & MMC_RSP_CRC)
251 cmdr |= SDMMC_CMD_RESP_CRC;
252
253 data = cmd->data;
254 if (data) {
255 cmdr |= SDMMC_CMD_DAT_EXP;
256 if (data->flags & MMC_DATA_STREAM)
257 cmdr |= SDMMC_CMD_STRM_MODE;
258 if (data->flags & MMC_DATA_WRITE)
259 cmdr |= SDMMC_CMD_DAT_WR;
260 }
261
262 return cmdr;
263 }
264
265 static void dw_mci_start_command(struct dw_mci *host,
266 struct mmc_command *cmd, u32 cmd_flags)
267 {
268 host->cmd = cmd;
269 dev_vdbg(&host->dev,
270 "start command: ARGR=0x%08x CMDR=0x%08x\n",
271 cmd->arg, cmd_flags);
272
273 mci_writel(host, CMDARG, cmd->arg);
274 wmb();
275
276 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
277 }
278
279 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
280 {
281 dw_mci_start_command(host, data->stop, host->stop_cmdr);
282 }
283
284 /* DMA interface functions */
285 static void dw_mci_stop_dma(struct dw_mci *host)
286 {
287 if (host->using_dma) {
288 host->dma_ops->stop(host);
289 host->dma_ops->cleanup(host);
290 } else {
291 /* Data transfer was stopped by the interrupt handler */
292 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
293 }
294 }
295
296 static int dw_mci_get_dma_dir(struct mmc_data *data)
297 {
298 if (data->flags & MMC_DATA_WRITE)
299 return DMA_TO_DEVICE;
300 else
301 return DMA_FROM_DEVICE;
302 }
303
304 #ifdef CONFIG_MMC_DW_IDMAC
305 static void dw_mci_dma_cleanup(struct dw_mci *host)
306 {
307 struct mmc_data *data = host->data;
308
309 if (data)
310 if (!data->host_cookie)
311 dma_unmap_sg(&host->dev,
312 data->sg,
313 data->sg_len,
314 dw_mci_get_dma_dir(data));
315 }
316
317 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
318 {
319 u32 temp;
320
321 /* Disable and reset the IDMAC interface */
322 temp = mci_readl(host, CTRL);
323 temp &= ~SDMMC_CTRL_USE_IDMAC;
324 temp |= SDMMC_CTRL_DMA_RESET;
325 mci_writel(host, CTRL, temp);
326
327 /* Stop the IDMAC running */
328 temp = mci_readl(host, BMOD);
329 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
330 mci_writel(host, BMOD, temp);
331 }
332
333 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
334 {
335 struct mmc_data *data = host->data;
336
337 dev_vdbg(&host->dev, "DMA complete\n");
338
339 host->dma_ops->cleanup(host);
340
341 /*
342 * If the card was removed, data will be NULL. No point in trying to
343 * send the stop command or waiting for NBUSY in this case.
344 */
345 if (data) {
346 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
347 tasklet_schedule(&host->tasklet);
348 }
349 }
350
351 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
352 unsigned int sg_len)
353 {
354 int i;
355 struct idmac_desc *desc = host->sg_cpu;
356
357 for (i = 0; i < sg_len; i++, desc++) {
358 unsigned int length = sg_dma_len(&data->sg[i]);
359 u32 mem_addr = sg_dma_address(&data->sg[i]);
360
361 /* Set the OWN bit and disable interrupts for this descriptor */
362 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
363
364 /* Buffer length */
365 IDMAC_SET_BUFFER1_SIZE(desc, length);
366
367 /* Physical address to DMA to/from */
368 desc->des2 = mem_addr;
369 }
370
371 /* Set first descriptor */
372 desc = host->sg_cpu;
373 desc->des0 |= IDMAC_DES0_FD;
374
375 /* Set last descriptor */
376 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
377 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
378 desc->des0 |= IDMAC_DES0_LD;
379
380 wmb();
381 }
382
383 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
384 {
385 u32 temp;
386
387 dw_mci_translate_sglist(host, host->data, sg_len);
388
389 /* Select IDMAC interface */
390 temp = mci_readl(host, CTRL);
391 temp |= SDMMC_CTRL_USE_IDMAC;
392 mci_writel(host, CTRL, temp);
393
394 wmb();
395
396 /* Enable the IDMAC */
397 temp = mci_readl(host, BMOD);
398 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
399 mci_writel(host, BMOD, temp);
400
401 /* Start it running */
402 mci_writel(host, PLDMND, 1);
403 }
404
405 static int dw_mci_idmac_init(struct dw_mci *host)
406 {
407 struct idmac_desc *p;
408 int i;
409
410 /* Number of descriptors in the ring buffer */
411 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
412
413 /* Forward link the descriptor list */
414 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
415 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
416
417 /* Set the last descriptor as the end-of-ring descriptor */
418 p->des3 = host->sg_dma;
419 p->des0 = IDMAC_DES0_ER;
420
421 mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
422
423 /* Mask out interrupts - get Tx & Rx complete only */
424 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
425 SDMMC_IDMAC_INT_TI);
426
427 /* Set the descriptor base address */
428 mci_writel(host, DBADDR, host->sg_dma);
429 return 0;
430 }
431
432 static struct dw_mci_dma_ops dw_mci_idmac_ops = {
433 .init = dw_mci_idmac_init,
434 .start = dw_mci_idmac_start_dma,
435 .stop = dw_mci_idmac_stop_dma,
436 .complete = dw_mci_idmac_complete_dma,
437 .cleanup = dw_mci_dma_cleanup,
438 };
439 #endif /* CONFIG_MMC_DW_IDMAC */
440
441 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
442 struct mmc_data *data,
443 bool next)
444 {
445 struct scatterlist *sg;
446 unsigned int i, sg_len;
447
448 if (!next && data->host_cookie)
449 return data->host_cookie;
450
451 /*
452 * We don't do DMA on "complex" transfers, i.e. with
453 * non-word-aligned buffers or lengths. Also, we don't bother
454 * with all the DMA setup overhead for short transfers.
455 */
456 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
457 return -EINVAL;
458
459 if (data->blksz & 3)
460 return -EINVAL;
461
462 for_each_sg(data->sg, sg, data->sg_len, i) {
463 if (sg->offset & 3 || sg->length & 3)
464 return -EINVAL;
465 }
466
467 sg_len = dma_map_sg(&host->dev,
468 data->sg,
469 data->sg_len,
470 dw_mci_get_dma_dir(data));
471 if (sg_len == 0)
472 return -EINVAL;
473
474 if (next)
475 data->host_cookie = sg_len;
476
477 return sg_len;
478 }
479
480 static void dw_mci_pre_req(struct mmc_host *mmc,
481 struct mmc_request *mrq,
482 bool is_first_req)
483 {
484 struct dw_mci_slot *slot = mmc_priv(mmc);
485 struct mmc_data *data = mrq->data;
486
487 if (!slot->host->use_dma || !data)
488 return;
489
490 if (data->host_cookie) {
491 data->host_cookie = 0;
492 return;
493 }
494
495 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
496 data->host_cookie = 0;
497 }
498
499 static void dw_mci_post_req(struct mmc_host *mmc,
500 struct mmc_request *mrq,
501 int err)
502 {
503 struct dw_mci_slot *slot = mmc_priv(mmc);
504 struct mmc_data *data = mrq->data;
505
506 if (!slot->host->use_dma || !data)
507 return;
508
509 if (data->host_cookie)
510 dma_unmap_sg(&slot->host->dev,
511 data->sg,
512 data->sg_len,
513 dw_mci_get_dma_dir(data));
514 data->host_cookie = 0;
515 }
516
517 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
518 {
519 int sg_len;
520 u32 temp;
521
522 host->using_dma = 0;
523
524 /* If we don't have a channel, we can't do DMA */
525 if (!host->use_dma)
526 return -ENODEV;
527
528 sg_len = dw_mci_pre_dma_transfer(host, data, 0);
529 if (sg_len < 0) {
530 host->dma_ops->stop(host);
531 return sg_len;
532 }
533
534 host->using_dma = 1;
535
536 dev_vdbg(&host->dev,
537 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
538 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
539 sg_len);
540
541 /* Enable the DMA interface */
542 temp = mci_readl(host, CTRL);
543 temp |= SDMMC_CTRL_DMA_ENABLE;
544 mci_writel(host, CTRL, temp);
545
546 /* Disable RX/TX IRQs, let DMA handle it */
547 temp = mci_readl(host, INTMASK);
548 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
549 mci_writel(host, INTMASK, temp);
550
551 host->dma_ops->start(host, sg_len);
552
553 return 0;
554 }
555
556 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
557 {
558 u32 temp;
559
560 data->error = -EINPROGRESS;
561
562 WARN_ON(host->data);
563 host->sg = NULL;
564 host->data = data;
565
566 if (data->flags & MMC_DATA_READ)
567 host->dir_status = DW_MCI_RECV_STATUS;
568 else
569 host->dir_status = DW_MCI_SEND_STATUS;
570
571 if (dw_mci_submit_data_dma(host, data)) {
572 int flags = SG_MITER_ATOMIC;
573 if (host->data->flags & MMC_DATA_READ)
574 flags |= SG_MITER_TO_SG;
575 else
576 flags |= SG_MITER_FROM_SG;
577
578 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
579 host->sg = data->sg;
580 host->part_buf_start = 0;
581 host->part_buf_count = 0;
582
583 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
584 temp = mci_readl(host, INTMASK);
585 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
586 mci_writel(host, INTMASK, temp);
587
588 temp = mci_readl(host, CTRL);
589 temp &= ~SDMMC_CTRL_DMA_ENABLE;
590 mci_writel(host, CTRL, temp);
591 }
592 }
593
594 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
595 {
596 struct dw_mci *host = slot->host;
597 unsigned long timeout = jiffies + msecs_to_jiffies(500);
598 unsigned int cmd_status = 0;
599
600 mci_writel(host, CMDARG, arg);
601 wmb();
602 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
603
604 while (time_before(jiffies, timeout)) {
605 cmd_status = mci_readl(host, CMD);
606 if (!(cmd_status & SDMMC_CMD_START))
607 return;
608 }
609 dev_err(&slot->mmc->class_dev,
610 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
611 cmd, arg, cmd_status);
612 }
613
614 static void dw_mci_setup_bus(struct dw_mci_slot *slot)
615 {
616 struct dw_mci *host = slot->host;
617 u32 div;
618
619 if (slot->clock != host->current_speed) {
620 div = host->bus_hz / slot->clock;
621 if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
622 /*
623 * move the + 1 after the divide to prevent
624 * over-clocking the card.
625 */
626 div += 1;
627
628 div = (host->bus_hz != slot->clock) ? DIV_ROUND_UP(div, 2) : 0;
629
630 dev_info(&slot->mmc->class_dev,
631 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
632 " div = %d)\n", slot->id, host->bus_hz, slot->clock,
633 div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
634
635 /* disable clock */
636 mci_writel(host, CLKENA, 0);
637 mci_writel(host, CLKSRC, 0);
638
639 /* inform CIU */
640 mci_send_cmd(slot,
641 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
642
643 /* set clock to desired speed */
644 mci_writel(host, CLKDIV, div);
645
646 /* inform CIU */
647 mci_send_cmd(slot,
648 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
649
650 /* enable clock */
651 mci_writel(host, CLKENA, ((SDMMC_CLKEN_ENABLE |
652 SDMMC_CLKEN_LOW_PWR) << slot->id));
653
654 /* inform CIU */
655 mci_send_cmd(slot,
656 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
657
658 host->current_speed = slot->clock;
659 }
660
661 /* Set the current slot bus width */
662 mci_writel(host, CTYPE, (slot->ctype << slot->id));
663 }
664
665 static void __dw_mci_start_request(struct dw_mci *host,
666 struct dw_mci_slot *slot,
667 struct mmc_command *cmd)
668 {
669 struct mmc_request *mrq;
670 struct mmc_data *data;
671 u32 cmdflags;
672
673 mrq = slot->mrq;
674 if (host->pdata->select_slot)
675 host->pdata->select_slot(slot->id);
676
677 /* Slot specific timing and width adjustment */
678 dw_mci_setup_bus(slot);
679
680 host->cur_slot = slot;
681 host->mrq = mrq;
682
683 host->pending_events = 0;
684 host->completed_events = 0;
685 host->data_status = 0;
686
687 data = cmd->data;
688 if (data) {
689 dw_mci_set_timeout(host);
690 mci_writel(host, BYTCNT, data->blksz*data->blocks);
691 mci_writel(host, BLKSIZ, data->blksz);
692 }
693
694 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
695
696 /* this is the first command, send the initialization clock */
697 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
698 cmdflags |= SDMMC_CMD_INIT;
699
700 if (data) {
701 dw_mci_submit_data(host, data);
702 wmb();
703 }
704
705 dw_mci_start_command(host, cmd, cmdflags);
706
707 if (mrq->stop)
708 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
709 }
710
711 static void dw_mci_start_request(struct dw_mci *host,
712 struct dw_mci_slot *slot)
713 {
714 struct mmc_request *mrq = slot->mrq;
715 struct mmc_command *cmd;
716
717 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
718 __dw_mci_start_request(host, slot, cmd);
719 }
720
721 /* must be called with host->lock held */
722 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
723 struct mmc_request *mrq)
724 {
725 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
726 host->state);
727
728 slot->mrq = mrq;
729
730 if (host->state == STATE_IDLE) {
731 host->state = STATE_SENDING_CMD;
732 dw_mci_start_request(host, slot);
733 } else {
734 list_add_tail(&slot->queue_node, &host->queue);
735 }
736 }
737
738 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
739 {
740 struct dw_mci_slot *slot = mmc_priv(mmc);
741 struct dw_mci *host = slot->host;
742
743 WARN_ON(slot->mrq);
744
745 /*
746 * The check for card presence and queueing of the request must be
747 * atomic, otherwise the card could be removed in between and the
748 * request wouldn't fail until another card was inserted.
749 */
750 spin_lock_bh(&host->lock);
751
752 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
753 spin_unlock_bh(&host->lock);
754 mrq->cmd->error = -ENOMEDIUM;
755 mmc_request_done(mmc, mrq);
756 return;
757 }
758
759 dw_mci_queue_request(host, slot, mrq);
760
761 spin_unlock_bh(&host->lock);
762 }
763
764 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
765 {
766 struct dw_mci_slot *slot = mmc_priv(mmc);
767 u32 regs;
768
769 /* set default 1 bit mode */
770 slot->ctype = SDMMC_CTYPE_1BIT;
771
772 switch (ios->bus_width) {
773 case MMC_BUS_WIDTH_1:
774 slot->ctype = SDMMC_CTYPE_1BIT;
775 break;
776 case MMC_BUS_WIDTH_4:
777 slot->ctype = SDMMC_CTYPE_4BIT;
778 break;
779 case MMC_BUS_WIDTH_8:
780 slot->ctype = SDMMC_CTYPE_8BIT;
781 break;
782 }
783
784 regs = mci_readl(slot->host, UHS_REG);
785
786 /* DDR mode set */
787 if (ios->timing == MMC_TIMING_UHS_DDR50)
788 regs |= (0x1 << slot->id) << 16;
789 else
790 regs &= ~(0x1 << slot->id) << 16;
791
792 mci_writel(slot->host, UHS_REG, regs);
793
794 if (ios->clock) {
795 /*
796 * Use mirror of ios->clock to prevent race with mmc
797 * core ios update when finding the minimum.
798 */
799 slot->clock = ios->clock;
800 }
801
802 switch (ios->power_mode) {
803 case MMC_POWER_UP:
804 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
805 break;
806 default:
807 break;
808 }
809 }
810
811 static int dw_mci_get_ro(struct mmc_host *mmc)
812 {
813 int read_only;
814 struct dw_mci_slot *slot = mmc_priv(mmc);
815 struct dw_mci_board *brd = slot->host->pdata;
816
817 /* Use platform get_ro function, else try on board write protect */
818 if (brd->get_ro)
819 read_only = brd->get_ro(slot->id);
820 else
821 read_only =
822 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
823
824 dev_dbg(&mmc->class_dev, "card is %s\n",
825 read_only ? "read-only" : "read-write");
826
827 return read_only;
828 }
829
830 static int dw_mci_get_cd(struct mmc_host *mmc)
831 {
832 int present;
833 struct dw_mci_slot *slot = mmc_priv(mmc);
834 struct dw_mci_board *brd = slot->host->pdata;
835
836 /* Use platform get_cd function, else try onboard card detect */
837 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
838 present = 1;
839 else if (brd->get_cd)
840 present = !brd->get_cd(slot->id);
841 else
842 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
843 == 0 ? 1 : 0;
844
845 if (present)
846 dev_dbg(&mmc->class_dev, "card is present\n");
847 else
848 dev_dbg(&mmc->class_dev, "card is not present\n");
849
850 return present;
851 }
852
853 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
854 {
855 struct dw_mci_slot *slot = mmc_priv(mmc);
856 struct dw_mci *host = slot->host;
857 u32 int_mask;
858
859 /* Enable/disable Slot Specific SDIO interrupt */
860 int_mask = mci_readl(host, INTMASK);
861 if (enb) {
862 mci_writel(host, INTMASK,
863 (int_mask | SDMMC_INT_SDIO(slot->id)));
864 } else {
865 mci_writel(host, INTMASK,
866 (int_mask & ~SDMMC_INT_SDIO(slot->id)));
867 }
868 }
869
870 static const struct mmc_host_ops dw_mci_ops = {
871 .request = dw_mci_request,
872 .pre_req = dw_mci_pre_req,
873 .post_req = dw_mci_post_req,
874 .set_ios = dw_mci_set_ios,
875 .get_ro = dw_mci_get_ro,
876 .get_cd = dw_mci_get_cd,
877 .enable_sdio_irq = dw_mci_enable_sdio_irq,
878 };
879
880 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
881 __releases(&host->lock)
882 __acquires(&host->lock)
883 {
884 struct dw_mci_slot *slot;
885 struct mmc_host *prev_mmc = host->cur_slot->mmc;
886
887 WARN_ON(host->cmd || host->data);
888
889 host->cur_slot->mrq = NULL;
890 host->mrq = NULL;
891 if (!list_empty(&host->queue)) {
892 slot = list_entry(host->queue.next,
893 struct dw_mci_slot, queue_node);
894 list_del(&slot->queue_node);
895 dev_vdbg(&host->dev, "list not empty: %s is next\n",
896 mmc_hostname(slot->mmc));
897 host->state = STATE_SENDING_CMD;
898 dw_mci_start_request(host, slot);
899 } else {
900 dev_vdbg(&host->dev, "list empty\n");
901 host->state = STATE_IDLE;
902 }
903
904 spin_unlock(&host->lock);
905 mmc_request_done(prev_mmc, mrq);
906 spin_lock(&host->lock);
907 }
908
909 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
910 {
911 u32 status = host->cmd_status;
912
913 host->cmd_status = 0;
914
915 /* Read the response from the card (up to 16 bytes) */
916 if (cmd->flags & MMC_RSP_PRESENT) {
917 if (cmd->flags & MMC_RSP_136) {
918 cmd->resp[3] = mci_readl(host, RESP0);
919 cmd->resp[2] = mci_readl(host, RESP1);
920 cmd->resp[1] = mci_readl(host, RESP2);
921 cmd->resp[0] = mci_readl(host, RESP3);
922 } else {
923 cmd->resp[0] = mci_readl(host, RESP0);
924 cmd->resp[1] = 0;
925 cmd->resp[2] = 0;
926 cmd->resp[3] = 0;
927 }
928 }
929
930 if (status & SDMMC_INT_RTO)
931 cmd->error = -ETIMEDOUT;
932 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
933 cmd->error = -EILSEQ;
934 else if (status & SDMMC_INT_RESP_ERR)
935 cmd->error = -EIO;
936 else
937 cmd->error = 0;
938
939 if (cmd->error) {
940 /* newer ip versions need a delay between retries */
941 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
942 mdelay(20);
943
944 if (cmd->data) {
945 dw_mci_stop_dma(host);
946 host->data = NULL;
947 }
948 }
949 }
950
951 static void dw_mci_tasklet_func(unsigned long priv)
952 {
953 struct dw_mci *host = (struct dw_mci *)priv;
954 struct mmc_data *data;
955 struct mmc_command *cmd;
956 enum dw_mci_state state;
957 enum dw_mci_state prev_state;
958 u32 status, ctrl;
959
960 spin_lock(&host->lock);
961
962 state = host->state;
963 data = host->data;
964
965 do {
966 prev_state = state;
967
968 switch (state) {
969 case STATE_IDLE:
970 break;
971
972 case STATE_SENDING_CMD:
973 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
974 &host->pending_events))
975 break;
976
977 cmd = host->cmd;
978 host->cmd = NULL;
979 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
980 dw_mci_command_complete(host, cmd);
981 if (cmd == host->mrq->sbc && !cmd->error) {
982 prev_state = state = STATE_SENDING_CMD;
983 __dw_mci_start_request(host, host->cur_slot,
984 host->mrq->cmd);
985 goto unlock;
986 }
987
988 if (!host->mrq->data || cmd->error) {
989 dw_mci_request_end(host, host->mrq);
990 goto unlock;
991 }
992
993 prev_state = state = STATE_SENDING_DATA;
994 /* fall through */
995
996 case STATE_SENDING_DATA:
997 if (test_and_clear_bit(EVENT_DATA_ERROR,
998 &host->pending_events)) {
999 dw_mci_stop_dma(host);
1000 if (data->stop)
1001 send_stop_cmd(host, data);
1002 state = STATE_DATA_ERROR;
1003 break;
1004 }
1005
1006 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1007 &host->pending_events))
1008 break;
1009
1010 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1011 prev_state = state = STATE_DATA_BUSY;
1012 /* fall through */
1013
1014 case STATE_DATA_BUSY:
1015 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1016 &host->pending_events))
1017 break;
1018
1019 host->data = NULL;
1020 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1021 status = host->data_status;
1022
1023 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1024 if (status & SDMMC_INT_DTO) {
1025 data->error = -ETIMEDOUT;
1026 } else if (status & SDMMC_INT_DCRC) {
1027 data->error = -EILSEQ;
1028 } else if (status & SDMMC_INT_EBE &&
1029 host->dir_status ==
1030 DW_MCI_SEND_STATUS) {
1031 /*
1032 * No data CRC status was returned.
1033 * The number of bytes transferred will
1034 * be exaggerated in PIO mode.
1035 */
1036 data->bytes_xfered = 0;
1037 data->error = -ETIMEDOUT;
1038 } else {
1039 dev_err(&host->dev,
1040 "data FIFO error "
1041 "(status=%08x)\n",
1042 status);
1043 data->error = -EIO;
1044 }
1045 /*
1046 * After an error, there may be data lingering
1047 * in the FIFO, so reset it - doing so
1048 * generates a block interrupt, hence setting
1049 * the scatter-gather pointer to NULL.
1050 */
1051 sg_miter_stop(&host->sg_miter);
1052 host->sg = NULL;
1053 ctrl = mci_readl(host, CTRL);
1054 ctrl |= SDMMC_CTRL_FIFO_RESET;
1055 mci_writel(host, CTRL, ctrl);
1056 } else {
1057 data->bytes_xfered = data->blocks * data->blksz;
1058 data->error = 0;
1059 }
1060
1061 if (!data->stop) {
1062 dw_mci_request_end(host, host->mrq);
1063 goto unlock;
1064 }
1065
1066 if (host->mrq->sbc && !data->error) {
1067 data->stop->error = 0;
1068 dw_mci_request_end(host, host->mrq);
1069 goto unlock;
1070 }
1071
1072 prev_state = state = STATE_SENDING_STOP;
1073 if (!data->error)
1074 send_stop_cmd(host, data);
1075 /* fall through */
1076
1077 case STATE_SENDING_STOP:
1078 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1079 &host->pending_events))
1080 break;
1081
1082 host->cmd = NULL;
1083 dw_mci_command_complete(host, host->mrq->stop);
1084 dw_mci_request_end(host, host->mrq);
1085 goto unlock;
1086
1087 case STATE_DATA_ERROR:
1088 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1089 &host->pending_events))
1090 break;
1091
1092 state = STATE_DATA_BUSY;
1093 break;
1094 }
1095 } while (state != prev_state);
1096
1097 host->state = state;
1098 unlock:
1099 spin_unlock(&host->lock);
1100
1101 }
1102
1103 /* push final bytes to part_buf, only use during push */
1104 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1105 {
1106 memcpy((void *)&host->part_buf, buf, cnt);
1107 host->part_buf_count = cnt;
1108 }
1109
1110 /* append bytes to part_buf, only use during push */
1111 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1112 {
1113 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1114 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1115 host->part_buf_count += cnt;
1116 return cnt;
1117 }
1118
1119 /* pull first bytes from part_buf, only use during pull */
1120 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1121 {
1122 cnt = min(cnt, (int)host->part_buf_count);
1123 if (cnt) {
1124 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1125 cnt);
1126 host->part_buf_count -= cnt;
1127 host->part_buf_start += cnt;
1128 }
1129 return cnt;
1130 }
1131
1132 /* pull final bytes from the part_buf, assuming it's just been filled */
1133 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1134 {
1135 memcpy(buf, &host->part_buf, cnt);
1136 host->part_buf_start = cnt;
1137 host->part_buf_count = (1 << host->data_shift) - cnt;
1138 }
1139
1140 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1141 {
1142 /* try and push anything in the part_buf */
1143 if (unlikely(host->part_buf_count)) {
1144 int len = dw_mci_push_part_bytes(host, buf, cnt);
1145 buf += len;
1146 cnt -= len;
1147 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1148 mci_writew(host, DATA(host->data_offset),
1149 host->part_buf16);
1150 host->part_buf_count = 0;
1151 }
1152 }
1153 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1154 if (unlikely((unsigned long)buf & 0x1)) {
1155 while (cnt >= 2) {
1156 u16 aligned_buf[64];
1157 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1158 int items = len >> 1;
1159 int i;
1160 /* memcpy from input buffer into aligned buffer */
1161 memcpy(aligned_buf, buf, len);
1162 buf += len;
1163 cnt -= len;
1164 /* push data from aligned buffer into fifo */
1165 for (i = 0; i < items; ++i)
1166 mci_writew(host, DATA(host->data_offset),
1167 aligned_buf[i]);
1168 }
1169 } else
1170 #endif
1171 {
1172 u16 *pdata = buf;
1173 for (; cnt >= 2; cnt -= 2)
1174 mci_writew(host, DATA(host->data_offset), *pdata++);
1175 buf = pdata;
1176 }
1177 /* put anything remaining in the part_buf */
1178 if (cnt) {
1179 dw_mci_set_part_bytes(host, buf, cnt);
1180 if (!sg_next(host->sg))
1181 mci_writew(host, DATA(host->data_offset),
1182 host->part_buf16);
1183 }
1184 }
1185
1186 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1187 {
1188 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1189 if (unlikely((unsigned long)buf & 0x1)) {
1190 while (cnt >= 2) {
1191 /* pull data from fifo into aligned buffer */
1192 u16 aligned_buf[64];
1193 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1194 int items = len >> 1;
1195 int i;
1196 for (i = 0; i < items; ++i)
1197 aligned_buf[i] = mci_readw(host,
1198 DATA(host->data_offset));
1199 /* memcpy from aligned buffer into output buffer */
1200 memcpy(buf, aligned_buf, len);
1201 buf += len;
1202 cnt -= len;
1203 }
1204 } else
1205 #endif
1206 {
1207 u16 *pdata = buf;
1208 for (; cnt >= 2; cnt -= 2)
1209 *pdata++ = mci_readw(host, DATA(host->data_offset));
1210 buf = pdata;
1211 }
1212 if (cnt) {
1213 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1214 dw_mci_pull_final_bytes(host, buf, cnt);
1215 }
1216 }
1217
1218 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1219 {
1220 /* try and push anything in the part_buf */
1221 if (unlikely(host->part_buf_count)) {
1222 int len = dw_mci_push_part_bytes(host, buf, cnt);
1223 buf += len;
1224 cnt -= len;
1225 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1226 mci_writel(host, DATA(host->data_offset),
1227 host->part_buf32);
1228 host->part_buf_count = 0;
1229 }
1230 }
1231 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1232 if (unlikely((unsigned long)buf & 0x3)) {
1233 while (cnt >= 4) {
1234 u32 aligned_buf[32];
1235 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1236 int items = len >> 2;
1237 int i;
1238 /* memcpy from input buffer into aligned buffer */
1239 memcpy(aligned_buf, buf, len);
1240 buf += len;
1241 cnt -= len;
1242 /* push data from aligned buffer into fifo */
1243 for (i = 0; i < items; ++i)
1244 mci_writel(host, DATA(host->data_offset),
1245 aligned_buf[i]);
1246 }
1247 } else
1248 #endif
1249 {
1250 u32 *pdata = buf;
1251 for (; cnt >= 4; cnt -= 4)
1252 mci_writel(host, DATA(host->data_offset), *pdata++);
1253 buf = pdata;
1254 }
1255 /* put anything remaining in the part_buf */
1256 if (cnt) {
1257 dw_mci_set_part_bytes(host, buf, cnt);
1258 if (!sg_next(host->sg))
1259 mci_writel(host, DATA(host->data_offset),
1260 host->part_buf32);
1261 }
1262 }
1263
1264 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1265 {
1266 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1267 if (unlikely((unsigned long)buf & 0x3)) {
1268 while (cnt >= 4) {
1269 /* pull data from fifo into aligned buffer */
1270 u32 aligned_buf[32];
1271 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1272 int items = len >> 2;
1273 int i;
1274 for (i = 0; i < items; ++i)
1275 aligned_buf[i] = mci_readl(host,
1276 DATA(host->data_offset));
1277 /* memcpy from aligned buffer into output buffer */
1278 memcpy(buf, aligned_buf, len);
1279 buf += len;
1280 cnt -= len;
1281 }
1282 } else
1283 #endif
1284 {
1285 u32 *pdata = buf;
1286 for (; cnt >= 4; cnt -= 4)
1287 *pdata++ = mci_readl(host, DATA(host->data_offset));
1288 buf = pdata;
1289 }
1290 if (cnt) {
1291 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1292 dw_mci_pull_final_bytes(host, buf, cnt);
1293 }
1294 }
1295
1296 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1297 {
1298 /* try and push anything in the part_buf */
1299 if (unlikely(host->part_buf_count)) {
1300 int len = dw_mci_push_part_bytes(host, buf, cnt);
1301 buf += len;
1302 cnt -= len;
1303 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1304 mci_writew(host, DATA(host->data_offset),
1305 host->part_buf);
1306 host->part_buf_count = 0;
1307 }
1308 }
1309 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1310 if (unlikely((unsigned long)buf & 0x7)) {
1311 while (cnt >= 8) {
1312 u64 aligned_buf[16];
1313 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1314 int items = len >> 3;
1315 int i;
1316 /* memcpy from input buffer into aligned buffer */
1317 memcpy(aligned_buf, buf, len);
1318 buf += len;
1319 cnt -= len;
1320 /* push data from aligned buffer into fifo */
1321 for (i = 0; i < items; ++i)
1322 mci_writeq(host, DATA(host->data_offset),
1323 aligned_buf[i]);
1324 }
1325 } else
1326 #endif
1327 {
1328 u64 *pdata = buf;
1329 for (; cnt >= 8; cnt -= 8)
1330 mci_writeq(host, DATA(host->data_offset), *pdata++);
1331 buf = pdata;
1332 }
1333 /* put anything remaining in the part_buf */
1334 if (cnt) {
1335 dw_mci_set_part_bytes(host, buf, cnt);
1336 if (!sg_next(host->sg))
1337 mci_writeq(host, DATA(host->data_offset),
1338 host->part_buf);
1339 }
1340 }
1341
1342 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1343 {
1344 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1345 if (unlikely((unsigned long)buf & 0x7)) {
1346 while (cnt >= 8) {
1347 /* pull data from fifo into aligned buffer */
1348 u64 aligned_buf[16];
1349 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1350 int items = len >> 3;
1351 int i;
1352 for (i = 0; i < items; ++i)
1353 aligned_buf[i] = mci_readq(host,
1354 DATA(host->data_offset));
1355 /* memcpy from aligned buffer into output buffer */
1356 memcpy(buf, aligned_buf, len);
1357 buf += len;
1358 cnt -= len;
1359 }
1360 } else
1361 #endif
1362 {
1363 u64 *pdata = buf;
1364 for (; cnt >= 8; cnt -= 8)
1365 *pdata++ = mci_readq(host, DATA(host->data_offset));
1366 buf = pdata;
1367 }
1368 if (cnt) {
1369 host->part_buf = mci_readq(host, DATA(host->data_offset));
1370 dw_mci_pull_final_bytes(host, buf, cnt);
1371 }
1372 }
1373
1374 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1375 {
1376 int len;
1377
1378 /* get remaining partial bytes */
1379 len = dw_mci_pull_part_bytes(host, buf, cnt);
1380 if (unlikely(len == cnt))
1381 return;
1382 buf += len;
1383 cnt -= len;
1384
1385 /* get the rest of the data */
1386 host->pull_data(host, buf, cnt);
1387 }
1388
1389 static void dw_mci_read_data_pio(struct dw_mci *host)
1390 {
1391 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1392 void *buf;
1393 unsigned int offset;
1394 struct mmc_data *data = host->data;
1395 int shift = host->data_shift;
1396 u32 status;
1397 unsigned int nbytes = 0, len;
1398 unsigned int remain, fcnt;
1399
1400 do {
1401 if (!sg_miter_next(sg_miter))
1402 goto done;
1403
1404 host->sg = sg_miter->__sg;
1405 buf = sg_miter->addr;
1406 remain = sg_miter->length;
1407 offset = 0;
1408
1409 do {
1410 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1411 << shift) + host->part_buf_count;
1412 len = min(remain, fcnt);
1413 if (!len)
1414 break;
1415 dw_mci_pull_data(host, (void *)(buf + offset), len);
1416 offset += len;
1417 nbytes += len;
1418 remain -= len;
1419 } while (remain);
1420 sg_miter->consumed = offset;
1421
1422 status = mci_readl(host, MINTSTS);
1423 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1424 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1425 host->data_status = status;
1426 data->bytes_xfered += nbytes;
1427 sg_miter_stop(sg_miter);
1428 host->sg = NULL;
1429 smp_wmb();
1430
1431 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1432
1433 tasklet_schedule(&host->tasklet);
1434 return;
1435 }
1436 } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1437 data->bytes_xfered += nbytes;
1438
1439 if (!remain) {
1440 if (!sg_miter_next(sg_miter))
1441 goto done;
1442 sg_miter->consumed = 0;
1443 }
1444 sg_miter_stop(sg_miter);
1445 return;
1446
1447 done:
1448 data->bytes_xfered += nbytes;
1449 sg_miter_stop(sg_miter);
1450 host->sg = NULL;
1451 smp_wmb();
1452 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1453 }
1454
1455 static void dw_mci_write_data_pio(struct dw_mci *host)
1456 {
1457 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1458 void *buf;
1459 unsigned int offset;
1460 struct mmc_data *data = host->data;
1461 int shift = host->data_shift;
1462 u32 status;
1463 unsigned int nbytes = 0, len;
1464 unsigned int fifo_depth = host->fifo_depth;
1465 unsigned int remain, fcnt;
1466
1467 do {
1468 if (!sg_miter_next(sg_miter))
1469 goto done;
1470
1471 host->sg = sg_miter->__sg;
1472 buf = sg_miter->addr;
1473 remain = sg_miter->length;
1474 offset = 0;
1475
1476 do {
1477 fcnt = ((fifo_depth -
1478 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1479 << shift) - host->part_buf_count;
1480 len = min(remain, fcnt);
1481 if (!len)
1482 break;
1483 host->push_data(host, (void *)(buf + offset), len);
1484 offset += len;
1485 nbytes += len;
1486 remain -= len;
1487 } while (remain);
1488 sg_miter->consumed = offset;
1489
1490 status = mci_readl(host, MINTSTS);
1491 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1492 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1493 host->data_status = status;
1494 data->bytes_xfered += nbytes;
1495 sg_miter_stop(sg_miter);
1496 host->sg = NULL;
1497
1498 smp_wmb();
1499
1500 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1501
1502 tasklet_schedule(&host->tasklet);
1503 return;
1504 }
1505 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1506 data->bytes_xfered += nbytes;
1507
1508 if (!remain) {
1509 if (!sg_miter_next(sg_miter))
1510 goto done;
1511 sg_miter->consumed = 0;
1512 }
1513 sg_miter_stop(sg_miter);
1514 return;
1515
1516 done:
1517 data->bytes_xfered += nbytes;
1518 sg_miter_stop(sg_miter);
1519 host->sg = NULL;
1520 smp_wmb();
1521 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1522 }
1523
1524 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1525 {
1526 if (!host->cmd_status)
1527 host->cmd_status = status;
1528
1529 smp_wmb();
1530
1531 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1532 tasklet_schedule(&host->tasklet);
1533 }
1534
1535 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1536 {
1537 struct dw_mci *host = dev_id;
1538 u32 status, pending;
1539 unsigned int pass_count = 0;
1540 int i;
1541
1542 do {
1543 status = mci_readl(host, RINTSTS);
1544 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1545
1546 /*
1547 * DTO fix - version 2.10a and below, and only if internal DMA
1548 * is configured.
1549 */
1550 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1551 if (!pending &&
1552 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1553 pending |= SDMMC_INT_DATA_OVER;
1554 }
1555
1556 if (!pending)
1557 break;
1558
1559 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1560 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1561 host->cmd_status = status;
1562 smp_wmb();
1563 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1564 }
1565
1566 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1567 /* if there is an error report DATA_ERROR */
1568 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1569 host->data_status = status;
1570 smp_wmb();
1571 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1572 if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
1573 SDMMC_INT_SBE | SDMMC_INT_EBE)))
1574 tasklet_schedule(&host->tasklet);
1575 }
1576
1577 if (pending & SDMMC_INT_DATA_OVER) {
1578 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1579 if (!host->data_status)
1580 host->data_status = status;
1581 smp_wmb();
1582 if (host->dir_status == DW_MCI_RECV_STATUS) {
1583 if (host->sg != NULL)
1584 dw_mci_read_data_pio(host);
1585 }
1586 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1587 tasklet_schedule(&host->tasklet);
1588 }
1589
1590 if (pending & SDMMC_INT_RXDR) {
1591 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1592 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1593 dw_mci_read_data_pio(host);
1594 }
1595
1596 if (pending & SDMMC_INT_TXDR) {
1597 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1598 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1599 dw_mci_write_data_pio(host);
1600 }
1601
1602 if (pending & SDMMC_INT_CMD_DONE) {
1603 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1604 dw_mci_cmd_interrupt(host, status);
1605 }
1606
1607 if (pending & SDMMC_INT_CD) {
1608 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1609 queue_work(host->card_workqueue, &host->card_work);
1610 }
1611
1612 /* Handle SDIO Interrupts */
1613 for (i = 0; i < host->num_slots; i++) {
1614 struct dw_mci_slot *slot = host->slot[i];
1615 if (pending & SDMMC_INT_SDIO(i)) {
1616 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1617 mmc_signal_sdio_irq(slot->mmc);
1618 }
1619 }
1620
1621 } while (pass_count++ < 5);
1622
1623 #ifdef CONFIG_MMC_DW_IDMAC
1624 /* Handle DMA interrupts */
1625 pending = mci_readl(host, IDSTS);
1626 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1627 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1628 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1629 host->dma_ops->complete(host);
1630 }
1631 #endif
1632
1633 return IRQ_HANDLED;
1634 }
1635
1636 static void dw_mci_work_routine_card(struct work_struct *work)
1637 {
1638 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1639 int i;
1640
1641 for (i = 0; i < host->num_slots; i++) {
1642 struct dw_mci_slot *slot = host->slot[i];
1643 struct mmc_host *mmc = slot->mmc;
1644 struct mmc_request *mrq;
1645 int present;
1646 u32 ctrl;
1647
1648 present = dw_mci_get_cd(mmc);
1649 while (present != slot->last_detect_state) {
1650 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1651 present ? "inserted" : "removed");
1652
1653 /* Power up slot (before spin_lock, may sleep) */
1654 if (present != 0 && host->pdata->setpower)
1655 host->pdata->setpower(slot->id, mmc->ocr_avail);
1656
1657 spin_lock_bh(&host->lock);
1658
1659 /* Card change detected */
1660 slot->last_detect_state = present;
1661
1662 /* Mark card as present if applicable */
1663 if (present != 0)
1664 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1665
1666 /* Clean up queue if present */
1667 mrq = slot->mrq;
1668 if (mrq) {
1669 if (mrq == host->mrq) {
1670 host->data = NULL;
1671 host->cmd = NULL;
1672
1673 switch (host->state) {
1674 case STATE_IDLE:
1675 break;
1676 case STATE_SENDING_CMD:
1677 mrq->cmd->error = -ENOMEDIUM;
1678 if (!mrq->data)
1679 break;
1680 /* fall through */
1681 case STATE_SENDING_DATA:
1682 mrq->data->error = -ENOMEDIUM;
1683 dw_mci_stop_dma(host);
1684 break;
1685 case STATE_DATA_BUSY:
1686 case STATE_DATA_ERROR:
1687 if (mrq->data->error == -EINPROGRESS)
1688 mrq->data->error = -ENOMEDIUM;
1689 if (!mrq->stop)
1690 break;
1691 /* fall through */
1692 case STATE_SENDING_STOP:
1693 mrq->stop->error = -ENOMEDIUM;
1694 break;
1695 }
1696
1697 dw_mci_request_end(host, mrq);
1698 } else {
1699 list_del(&slot->queue_node);
1700 mrq->cmd->error = -ENOMEDIUM;
1701 if (mrq->data)
1702 mrq->data->error = -ENOMEDIUM;
1703 if (mrq->stop)
1704 mrq->stop->error = -ENOMEDIUM;
1705
1706 spin_unlock(&host->lock);
1707 mmc_request_done(slot->mmc, mrq);
1708 spin_lock(&host->lock);
1709 }
1710 }
1711
1712 /* Power down slot */
1713 if (present == 0) {
1714 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1715
1716 /*
1717 * Clear down the FIFO - doing so generates a
1718 * block interrupt, hence setting the
1719 * scatter-gather pointer to NULL.
1720 */
1721 sg_miter_stop(&host->sg_miter);
1722 host->sg = NULL;
1723
1724 ctrl = mci_readl(host, CTRL);
1725 ctrl |= SDMMC_CTRL_FIFO_RESET;
1726 mci_writel(host, CTRL, ctrl);
1727
1728 #ifdef CONFIG_MMC_DW_IDMAC
1729 ctrl = mci_readl(host, BMOD);
1730 /* Software reset of DMA */
1731 ctrl |= SDMMC_IDMAC_SWRESET;
1732 mci_writel(host, BMOD, ctrl);
1733 #endif
1734
1735 }
1736
1737 spin_unlock_bh(&host->lock);
1738
1739 /* Power down slot (after spin_unlock, may sleep) */
1740 if (present == 0 && host->pdata->setpower)
1741 host->pdata->setpower(slot->id, 0);
1742
1743 present = dw_mci_get_cd(mmc);
1744 }
1745
1746 mmc_detect_change(slot->mmc,
1747 msecs_to_jiffies(host->pdata->detect_delay_ms));
1748 }
1749 }
1750
1751 static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1752 {
1753 struct mmc_host *mmc;
1754 struct dw_mci_slot *slot;
1755
1756 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->dev);
1757 if (!mmc)
1758 return -ENOMEM;
1759
1760 slot = mmc_priv(mmc);
1761 slot->id = id;
1762 slot->mmc = mmc;
1763 slot->host = host;
1764
1765 mmc->ops = &dw_mci_ops;
1766 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1767 mmc->f_max = host->bus_hz;
1768
1769 if (host->pdata->get_ocr)
1770 mmc->ocr_avail = host->pdata->get_ocr(id);
1771 else
1772 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1773
1774 /*
1775 * Start with slot power disabled, it will be enabled when a card
1776 * is detected.
1777 */
1778 if (host->pdata->setpower)
1779 host->pdata->setpower(id, 0);
1780
1781 if (host->pdata->caps)
1782 mmc->caps = host->pdata->caps;
1783
1784 if (host->pdata->caps2)
1785 mmc->caps2 = host->pdata->caps2;
1786
1787 if (host->pdata->get_bus_wd)
1788 if (host->pdata->get_bus_wd(slot->id) >= 4)
1789 mmc->caps |= MMC_CAP_4_BIT_DATA;
1790
1791 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1792 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1793
1794 if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
1795 mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
1796 else
1797 mmc->power_notify_type = MMC_HOST_PW_NOTIFY_NONE;
1798
1799 if (host->pdata->blk_settings) {
1800 mmc->max_segs = host->pdata->blk_settings->max_segs;
1801 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1802 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1803 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1804 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1805 } else {
1806 /* Useful defaults if platform data is unset. */
1807 #ifdef CONFIG_MMC_DW_IDMAC
1808 mmc->max_segs = host->ring_size;
1809 mmc->max_blk_size = 65536;
1810 mmc->max_blk_count = host->ring_size;
1811 mmc->max_seg_size = 0x1000;
1812 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1813 #else
1814 mmc->max_segs = 64;
1815 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1816 mmc->max_blk_count = 512;
1817 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1818 mmc->max_seg_size = mmc->max_req_size;
1819 #endif /* CONFIG_MMC_DW_IDMAC */
1820 }
1821
1822 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1823 if (IS_ERR(host->vmmc)) {
1824 pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
1825 host->vmmc = NULL;
1826 } else
1827 regulator_enable(host->vmmc);
1828
1829 if (dw_mci_get_cd(mmc))
1830 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1831 else
1832 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1833
1834 host->slot[id] = slot;
1835 mmc_add_host(mmc);
1836
1837 #if defined(CONFIG_DEBUG_FS)
1838 dw_mci_init_debugfs(slot);
1839 #endif
1840
1841 /* Card initially undetected */
1842 slot->last_detect_state = 0;
1843
1844 /*
1845 * Card may have been plugged in prior to boot so we
1846 * need to run the detect tasklet
1847 */
1848 queue_work(host->card_workqueue, &host->card_work);
1849
1850 return 0;
1851 }
1852
1853 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
1854 {
1855 /* Shutdown detect IRQ */
1856 if (slot->host->pdata->exit)
1857 slot->host->pdata->exit(id);
1858
1859 /* Debugfs stuff is cleaned up by mmc core */
1860 mmc_remove_host(slot->mmc);
1861 slot->host->slot[id] = NULL;
1862 mmc_free_host(slot->mmc);
1863 }
1864
1865 static void dw_mci_init_dma(struct dw_mci *host)
1866 {
1867 /* Alloc memory for sg translation */
1868 host->sg_cpu = dma_alloc_coherent(&host->dev, PAGE_SIZE,
1869 &host->sg_dma, GFP_KERNEL);
1870 if (!host->sg_cpu) {
1871 dev_err(&host->dev, "%s: could not alloc DMA memory\n",
1872 __func__);
1873 goto no_dma;
1874 }
1875
1876 /* Determine which DMA interface to use */
1877 #ifdef CONFIG_MMC_DW_IDMAC
1878 host->dma_ops = &dw_mci_idmac_ops;
1879 dev_info(&host->dev, "Using internal DMA controller.\n");
1880 #endif
1881
1882 if (!host->dma_ops)
1883 goto no_dma;
1884
1885 if (host->dma_ops->init && host->dma_ops->start &&
1886 host->dma_ops->stop && host->dma_ops->cleanup) {
1887 if (host->dma_ops->init(host)) {
1888 dev_err(&host->dev, "%s: Unable to initialize "
1889 "DMA Controller.\n", __func__);
1890 goto no_dma;
1891 }
1892 } else {
1893 dev_err(&host->dev, "DMA initialization not found.\n");
1894 goto no_dma;
1895 }
1896
1897 host->use_dma = 1;
1898 return;
1899
1900 no_dma:
1901 dev_info(&host->dev, "Using PIO mode.\n");
1902 host->use_dma = 0;
1903 return;
1904 }
1905
1906 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
1907 {
1908 unsigned long timeout = jiffies + msecs_to_jiffies(500);
1909 unsigned int ctrl;
1910
1911 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1912 SDMMC_CTRL_DMA_RESET));
1913
1914 /* wait till resets clear */
1915 do {
1916 ctrl = mci_readl(host, CTRL);
1917 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1918 SDMMC_CTRL_DMA_RESET)))
1919 return true;
1920 } while (time_before(jiffies, timeout));
1921
1922 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
1923
1924 return false;
1925 }
1926
1927 int dw_mci_probe(struct dw_mci *host)
1928 {
1929 int width, i, ret = 0;
1930 u32 fifo_size;
1931
1932 if (!host->pdata || !host->pdata->init) {
1933 dev_err(&host->dev,
1934 "Platform data must supply init function\n");
1935 return -ENODEV;
1936 }
1937
1938 if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
1939 dev_err(&host->dev,
1940 "Platform data must supply select_slot function\n");
1941 return -ENODEV;
1942 }
1943
1944 if (!host->pdata->bus_hz) {
1945 dev_err(&host->dev,
1946 "Platform data must supply bus speed\n");
1947 return -ENODEV;
1948 }
1949
1950 host->bus_hz = host->pdata->bus_hz;
1951 host->quirks = host->pdata->quirks;
1952
1953 spin_lock_init(&host->lock);
1954 INIT_LIST_HEAD(&host->queue);
1955
1956 /*
1957 * Get the host data width - this assumes that HCON has been set with
1958 * the correct values.
1959 */
1960 i = (mci_readl(host, HCON) >> 7) & 0x7;
1961 if (!i) {
1962 host->push_data = dw_mci_push_data16;
1963 host->pull_data = dw_mci_pull_data16;
1964 width = 16;
1965 host->data_shift = 1;
1966 } else if (i == 2) {
1967 host->push_data = dw_mci_push_data64;
1968 host->pull_data = dw_mci_pull_data64;
1969 width = 64;
1970 host->data_shift = 3;
1971 } else {
1972 /* Check for a reserved value, and warn if it is */
1973 WARN((i != 1),
1974 "HCON reports a reserved host data width!\n"
1975 "Defaulting to 32-bit access.\n");
1976 host->push_data = dw_mci_push_data32;
1977 host->pull_data = dw_mci_pull_data32;
1978 width = 32;
1979 host->data_shift = 2;
1980 }
1981
1982 /* Reset all blocks */
1983 if (!mci_wait_reset(&host->dev, host))
1984 return -ENODEV;
1985
1986 host->dma_ops = host->pdata->dma_ops;
1987 dw_mci_init_dma(host);
1988
1989 /* Clear the interrupts for the host controller */
1990 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1991 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1992
1993 /* Put in max timeout */
1994 mci_writel(host, TMOUT, 0xFFFFFFFF);
1995
1996 /*
1997 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
1998 * Tx Mark = fifo_size / 2 DMA Size = 8
1999 */
2000 if (!host->pdata->fifo_depth) {
2001 /*
2002 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2003 * have been overwritten by the bootloader, just like we're
2004 * about to do, so if you know the value for your hardware, you
2005 * should put it in the platform data.
2006 */
2007 fifo_size = mci_readl(host, FIFOTH);
2008 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2009 } else {
2010 fifo_size = host->pdata->fifo_depth;
2011 }
2012 host->fifo_depth = fifo_size;
2013 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
2014 ((fifo_size/2) << 0));
2015 mci_writel(host, FIFOTH, host->fifoth_val);
2016
2017 /* disable clock to CIU */
2018 mci_writel(host, CLKENA, 0);
2019 mci_writel(host, CLKSRC, 0);
2020
2021 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2022 host->card_workqueue = alloc_workqueue("dw-mci-card",
2023 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
2024 if (!host->card_workqueue)
2025 goto err_dmaunmap;
2026 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
2027 ret = request_irq(host->irq, dw_mci_interrupt, host->irq_flags, "dw-mci", host);
2028 if (ret)
2029 goto err_workqueue;
2030
2031 if (host->pdata->num_slots)
2032 host->num_slots = host->pdata->num_slots;
2033 else
2034 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2035
2036 /* We need at least one slot to succeed */
2037 for (i = 0; i < host->num_slots; i++) {
2038 ret = dw_mci_init_slot(host, i);
2039 if (ret) {
2040 ret = -ENODEV;
2041 goto err_init_slot;
2042 }
2043 }
2044
2045 /*
2046 * In 2.40a spec, Data offset is changed.
2047 * Need to check the version-id and set data-offset for DATA register.
2048 */
2049 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2050 dev_info(&host->dev, "Version ID is %04x\n", host->verid);
2051
2052 if (host->verid < DW_MMC_240A)
2053 host->data_offset = DATA_OFFSET;
2054 else
2055 host->data_offset = DATA_240A_OFFSET;
2056
2057 /*
2058 * Enable interrupts for command done, data over, data empty, card det,
2059 * receive ready and error such as transmit, receive timeout, crc error
2060 */
2061 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2062 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2063 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2064 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2065 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2066
2067 dev_info(&host->dev, "DW MMC controller at irq %d, "
2068 "%d bit host data width, "
2069 "%u deep fifo\n",
2070 host->irq, width, fifo_size);
2071 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2072 dev_info(&host->dev, "Internal DMAC interrupt fix enabled.\n");
2073
2074 return 0;
2075
2076 err_init_slot:
2077 /* De-init any initialized slots */
2078 while (i > 0) {
2079 if (host->slot[i])
2080 dw_mci_cleanup_slot(host->slot[i], i);
2081 i--;
2082 }
2083 free_irq(host->irq, host);
2084
2085 err_workqueue:
2086 destroy_workqueue(host->card_workqueue);
2087
2088 err_dmaunmap:
2089 if (host->use_dma && host->dma_ops->exit)
2090 host->dma_ops->exit(host);
2091 dma_free_coherent(&host->dev, PAGE_SIZE,
2092 host->sg_cpu, host->sg_dma);
2093
2094 if (host->vmmc) {
2095 regulator_disable(host->vmmc);
2096 regulator_put(host->vmmc);
2097 }
2098 return ret;
2099 }
2100 EXPORT_SYMBOL(dw_mci_probe);
2101
2102 void dw_mci_remove(struct dw_mci *host)
2103 {
2104 int i;
2105
2106 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2107 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2108
2109 for (i = 0; i < host->num_slots; i++) {
2110 dev_dbg(&host->dev, "remove slot %d\n", i);
2111 if (host->slot[i])
2112 dw_mci_cleanup_slot(host->slot[i], i);
2113 }
2114
2115 /* disable clock to CIU */
2116 mci_writel(host, CLKENA, 0);
2117 mci_writel(host, CLKSRC, 0);
2118
2119 free_irq(host->irq, host);
2120 destroy_workqueue(host->card_workqueue);
2121 dma_free_coherent(&host->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
2122
2123 if (host->use_dma && host->dma_ops->exit)
2124 host->dma_ops->exit(host);
2125
2126 if (host->vmmc) {
2127 regulator_disable(host->vmmc);
2128 regulator_put(host->vmmc);
2129 }
2130
2131 }
2132 EXPORT_SYMBOL(dw_mci_remove);
2133
2134
2135
2136 #ifdef CONFIG_PM_SLEEP
2137 /*
2138 * TODO: we should probably disable the clock to the card in the suspend path.
2139 */
2140 int dw_mci_suspend(struct dw_mci *host)
2141 {
2142 int i, ret = 0;
2143
2144 for (i = 0; i < host->num_slots; i++) {
2145 struct dw_mci_slot *slot = host->slot[i];
2146 if (!slot)
2147 continue;
2148 ret = mmc_suspend_host(slot->mmc);
2149 if (ret < 0) {
2150 while (--i >= 0) {
2151 slot = host->slot[i];
2152 if (slot)
2153 mmc_resume_host(host->slot[i]->mmc);
2154 }
2155 return ret;
2156 }
2157 }
2158
2159 if (host->vmmc)
2160 regulator_disable(host->vmmc);
2161
2162 return 0;
2163 }
2164 EXPORT_SYMBOL(dw_mci_suspend);
2165
2166 int dw_mci_resume(struct dw_mci *host)
2167 {
2168 int i, ret;
2169
2170 if (host->vmmc)
2171 regulator_enable(host->vmmc);
2172
2173 if (!mci_wait_reset(&host->dev, host)) {
2174 ret = -ENODEV;
2175 return ret;
2176 }
2177
2178 if (host->dma_ops->init)
2179 host->dma_ops->init(host);
2180
2181 /* Restore the old value at FIFOTH register */
2182 mci_writel(host, FIFOTH, host->fifoth_val);
2183
2184 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2185 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2186 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2187 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2188 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2189
2190 for (i = 0; i < host->num_slots; i++) {
2191 struct dw_mci_slot *slot = host->slot[i];
2192 if (!slot)
2193 continue;
2194 ret = mmc_resume_host(host->slot[i]->mmc);
2195 if (ret < 0)
2196 return ret;
2197 }
2198 return 0;
2199 }
2200 EXPORT_SYMBOL(dw_mci_resume);
2201 #endif /* CONFIG_PM_SLEEP */
2202
2203 static int __init dw_mci_init(void)
2204 {
2205 printk(KERN_INFO "Synopsys Designware Multimedia Card Interface Driver");
2206 return 0;
2207 }
2208
2209 static void __exit dw_mci_exit(void)
2210 {
2211 }
2212
2213 module_init(dw_mci_init);
2214 module_exit(dw_mci_exit);
2215
2216 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2217 MODULE_AUTHOR("NXP Semiconductor VietNam");
2218 MODULE_AUTHOR("Imagination Technologies Ltd");
2219 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
This page took 0.082711 seconds and 6 git commands to generate.