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Merge tag 'pci-v3.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[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/sdio.h>
33 #include <linux/mmc/dw_mmc.h>
34 #include <linux/bitops.h>
35 #include <linux/regulator/consumer.h>
36 #include <linux/workqueue.h>
37 #include <linux/of.h>
38 #include <linux/of_gpio.h>
39 #include <linux/mmc/slot-gpio.h>
40
41 #include "dw_mmc.h"
42
43 /* Common flag combinations */
44 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
45 SDMMC_INT_HTO | SDMMC_INT_SBE | \
46 SDMMC_INT_EBE)
47 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
48 SDMMC_INT_RESP_ERR)
49 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
50 DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
51 #define DW_MCI_SEND_STATUS 1
52 #define DW_MCI_RECV_STATUS 2
53 #define DW_MCI_DMA_THRESHOLD 16
54
55 #define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */
56 #define DW_MCI_FREQ_MIN 400000 /* unit: HZ */
57
58 #ifdef CONFIG_MMC_DW_IDMAC
59 #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
60 SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
61 SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
62 SDMMC_IDMAC_INT_TI)
63
64 struct idmac_desc {
65 u32 des0; /* Control Descriptor */
66 #define IDMAC_DES0_DIC BIT(1)
67 #define IDMAC_DES0_LD BIT(2)
68 #define IDMAC_DES0_FD BIT(3)
69 #define IDMAC_DES0_CH BIT(4)
70 #define IDMAC_DES0_ER BIT(5)
71 #define IDMAC_DES0_CES BIT(30)
72 #define IDMAC_DES0_OWN BIT(31)
73
74 u32 des1; /* Buffer sizes */
75 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
76 ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
77
78 u32 des2; /* buffer 1 physical address */
79
80 u32 des3; /* buffer 2 physical address */
81 };
82 #endif /* CONFIG_MMC_DW_IDMAC */
83
84 static const u8 tuning_blk_pattern_4bit[] = {
85 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
86 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
87 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
88 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
89 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
90 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
91 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
92 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
93 };
94
95 static const u8 tuning_blk_pattern_8bit[] = {
96 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
97 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
98 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
99 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
100 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
101 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
102 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
103 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
104 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
105 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
106 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
107 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
108 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
109 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
110 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
111 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
112 };
113
114 static inline bool dw_mci_fifo_reset(struct dw_mci *host);
115 static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host);
116
117 #if defined(CONFIG_DEBUG_FS)
118 static int dw_mci_req_show(struct seq_file *s, void *v)
119 {
120 struct dw_mci_slot *slot = s->private;
121 struct mmc_request *mrq;
122 struct mmc_command *cmd;
123 struct mmc_command *stop;
124 struct mmc_data *data;
125
126 /* Make sure we get a consistent snapshot */
127 spin_lock_bh(&slot->host->lock);
128 mrq = slot->mrq;
129
130 if (mrq) {
131 cmd = mrq->cmd;
132 data = mrq->data;
133 stop = mrq->stop;
134
135 if (cmd)
136 seq_printf(s,
137 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
138 cmd->opcode, cmd->arg, cmd->flags,
139 cmd->resp[0], cmd->resp[1], cmd->resp[2],
140 cmd->resp[2], cmd->error);
141 if (data)
142 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
143 data->bytes_xfered, data->blocks,
144 data->blksz, data->flags, data->error);
145 if (stop)
146 seq_printf(s,
147 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
148 stop->opcode, stop->arg, stop->flags,
149 stop->resp[0], stop->resp[1], stop->resp[2],
150 stop->resp[2], stop->error);
151 }
152
153 spin_unlock_bh(&slot->host->lock);
154
155 return 0;
156 }
157
158 static int dw_mci_req_open(struct inode *inode, struct file *file)
159 {
160 return single_open(file, dw_mci_req_show, inode->i_private);
161 }
162
163 static const struct file_operations dw_mci_req_fops = {
164 .owner = THIS_MODULE,
165 .open = dw_mci_req_open,
166 .read = seq_read,
167 .llseek = seq_lseek,
168 .release = single_release,
169 };
170
171 static int dw_mci_regs_show(struct seq_file *s, void *v)
172 {
173 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
174 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
175 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
176 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
177 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
178 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
179
180 return 0;
181 }
182
183 static int dw_mci_regs_open(struct inode *inode, struct file *file)
184 {
185 return single_open(file, dw_mci_regs_show, inode->i_private);
186 }
187
188 static const struct file_operations dw_mci_regs_fops = {
189 .owner = THIS_MODULE,
190 .open = dw_mci_regs_open,
191 .read = seq_read,
192 .llseek = seq_lseek,
193 .release = single_release,
194 };
195
196 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
197 {
198 struct mmc_host *mmc = slot->mmc;
199 struct dw_mci *host = slot->host;
200 struct dentry *root;
201 struct dentry *node;
202
203 root = mmc->debugfs_root;
204 if (!root)
205 return;
206
207 node = debugfs_create_file("regs", S_IRUSR, root, host,
208 &dw_mci_regs_fops);
209 if (!node)
210 goto err;
211
212 node = debugfs_create_file("req", S_IRUSR, root, slot,
213 &dw_mci_req_fops);
214 if (!node)
215 goto err;
216
217 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
218 if (!node)
219 goto err;
220
221 node = debugfs_create_x32("pending_events", S_IRUSR, root,
222 (u32 *)&host->pending_events);
223 if (!node)
224 goto err;
225
226 node = debugfs_create_x32("completed_events", S_IRUSR, root,
227 (u32 *)&host->completed_events);
228 if (!node)
229 goto err;
230
231 return;
232
233 err:
234 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
235 }
236 #endif /* defined(CONFIG_DEBUG_FS) */
237
238 static void dw_mci_set_timeout(struct dw_mci *host)
239 {
240 /* timeout (maximum) */
241 mci_writel(host, TMOUT, 0xffffffff);
242 }
243
244 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
245 {
246 struct mmc_data *data;
247 struct dw_mci_slot *slot = mmc_priv(mmc);
248 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
249 u32 cmdr;
250 cmd->error = -EINPROGRESS;
251
252 cmdr = cmd->opcode;
253
254 if (cmd->opcode == MMC_STOP_TRANSMISSION ||
255 cmd->opcode == MMC_GO_IDLE_STATE ||
256 cmd->opcode == MMC_GO_INACTIVE_STATE ||
257 (cmd->opcode == SD_IO_RW_DIRECT &&
258 ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
259 cmdr |= SDMMC_CMD_STOP;
260 else
261 if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
262 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
263
264 if (cmd->flags & MMC_RSP_PRESENT) {
265 /* We expect a response, so set this bit */
266 cmdr |= SDMMC_CMD_RESP_EXP;
267 if (cmd->flags & MMC_RSP_136)
268 cmdr |= SDMMC_CMD_RESP_LONG;
269 }
270
271 if (cmd->flags & MMC_RSP_CRC)
272 cmdr |= SDMMC_CMD_RESP_CRC;
273
274 data = cmd->data;
275 if (data) {
276 cmdr |= SDMMC_CMD_DAT_EXP;
277 if (data->flags & MMC_DATA_STREAM)
278 cmdr |= SDMMC_CMD_STRM_MODE;
279 if (data->flags & MMC_DATA_WRITE)
280 cmdr |= SDMMC_CMD_DAT_WR;
281 }
282
283 if (drv_data && drv_data->prepare_command)
284 drv_data->prepare_command(slot->host, &cmdr);
285
286 return cmdr;
287 }
288
289 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
290 {
291 struct mmc_command *stop;
292 u32 cmdr;
293
294 if (!cmd->data)
295 return 0;
296
297 stop = &host->stop_abort;
298 cmdr = cmd->opcode;
299 memset(stop, 0, sizeof(struct mmc_command));
300
301 if (cmdr == MMC_READ_SINGLE_BLOCK ||
302 cmdr == MMC_READ_MULTIPLE_BLOCK ||
303 cmdr == MMC_WRITE_BLOCK ||
304 cmdr == MMC_WRITE_MULTIPLE_BLOCK) {
305 stop->opcode = MMC_STOP_TRANSMISSION;
306 stop->arg = 0;
307 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
308 } else if (cmdr == SD_IO_RW_EXTENDED) {
309 stop->opcode = SD_IO_RW_DIRECT;
310 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
311 ((cmd->arg >> 28) & 0x7);
312 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
313 } else {
314 return 0;
315 }
316
317 cmdr = stop->opcode | SDMMC_CMD_STOP |
318 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
319
320 return cmdr;
321 }
322
323 static void dw_mci_start_command(struct dw_mci *host,
324 struct mmc_command *cmd, u32 cmd_flags)
325 {
326 host->cmd = cmd;
327 dev_vdbg(host->dev,
328 "start command: ARGR=0x%08x CMDR=0x%08x\n",
329 cmd->arg, cmd_flags);
330
331 mci_writel(host, CMDARG, cmd->arg);
332 wmb();
333
334 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
335 }
336
337 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
338 {
339 struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
340 dw_mci_start_command(host, stop, host->stop_cmdr);
341 }
342
343 /* DMA interface functions */
344 static void dw_mci_stop_dma(struct dw_mci *host)
345 {
346 if (host->using_dma) {
347 host->dma_ops->stop(host);
348 host->dma_ops->cleanup(host);
349 }
350
351 /* Data transfer was stopped by the interrupt handler */
352 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
353 }
354
355 static int dw_mci_get_dma_dir(struct mmc_data *data)
356 {
357 if (data->flags & MMC_DATA_WRITE)
358 return DMA_TO_DEVICE;
359 else
360 return DMA_FROM_DEVICE;
361 }
362
363 #ifdef CONFIG_MMC_DW_IDMAC
364 static void dw_mci_dma_cleanup(struct dw_mci *host)
365 {
366 struct mmc_data *data = host->data;
367
368 if (data)
369 if (!data->host_cookie)
370 dma_unmap_sg(host->dev,
371 data->sg,
372 data->sg_len,
373 dw_mci_get_dma_dir(data));
374 }
375
376 static void dw_mci_idmac_reset(struct dw_mci *host)
377 {
378 u32 bmod = mci_readl(host, BMOD);
379 /* Software reset of DMA */
380 bmod |= SDMMC_IDMAC_SWRESET;
381 mci_writel(host, BMOD, bmod);
382 }
383
384 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
385 {
386 u32 temp;
387
388 /* Disable and reset the IDMAC interface */
389 temp = mci_readl(host, CTRL);
390 temp &= ~SDMMC_CTRL_USE_IDMAC;
391 temp |= SDMMC_CTRL_DMA_RESET;
392 mci_writel(host, CTRL, temp);
393
394 /* Stop the IDMAC running */
395 temp = mci_readl(host, BMOD);
396 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
397 temp |= SDMMC_IDMAC_SWRESET;
398 mci_writel(host, BMOD, temp);
399 }
400
401 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
402 {
403 struct mmc_data *data = host->data;
404
405 dev_vdbg(host->dev, "DMA complete\n");
406
407 host->dma_ops->cleanup(host);
408
409 /*
410 * If the card was removed, data will be NULL. No point in trying to
411 * send the stop command or waiting for NBUSY in this case.
412 */
413 if (data) {
414 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
415 tasklet_schedule(&host->tasklet);
416 }
417 }
418
419 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
420 unsigned int sg_len)
421 {
422 int i;
423 struct idmac_desc *desc = host->sg_cpu;
424
425 for (i = 0; i < sg_len; i++, desc++) {
426 unsigned int length = sg_dma_len(&data->sg[i]);
427 u32 mem_addr = sg_dma_address(&data->sg[i]);
428
429 /* Set the OWN bit and disable interrupts for this descriptor */
430 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
431
432 /* Buffer length */
433 IDMAC_SET_BUFFER1_SIZE(desc, length);
434
435 /* Physical address to DMA to/from */
436 desc->des2 = mem_addr;
437 }
438
439 /* Set first descriptor */
440 desc = host->sg_cpu;
441 desc->des0 |= IDMAC_DES0_FD;
442
443 /* Set last descriptor */
444 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
445 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
446 desc->des0 |= IDMAC_DES0_LD;
447
448 wmb();
449 }
450
451 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
452 {
453 u32 temp;
454
455 dw_mci_translate_sglist(host, host->data, sg_len);
456
457 /* Select IDMAC interface */
458 temp = mci_readl(host, CTRL);
459 temp |= SDMMC_CTRL_USE_IDMAC;
460 mci_writel(host, CTRL, temp);
461
462 wmb();
463
464 /* Enable the IDMAC */
465 temp = mci_readl(host, BMOD);
466 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
467 mci_writel(host, BMOD, temp);
468
469 /* Start it running */
470 mci_writel(host, PLDMND, 1);
471 }
472
473 static int dw_mci_idmac_init(struct dw_mci *host)
474 {
475 struct idmac_desc *p;
476 int i;
477
478 /* Number of descriptors in the ring buffer */
479 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
480
481 /* Forward link the descriptor list */
482 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
483 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
484
485 /* Set the last descriptor as the end-of-ring descriptor */
486 p->des3 = host->sg_dma;
487 p->des0 = IDMAC_DES0_ER;
488
489 dw_mci_idmac_reset(host);
490
491 /* Mask out interrupts - get Tx & Rx complete only */
492 mci_writel(host, IDSTS, IDMAC_INT_CLR);
493 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
494 SDMMC_IDMAC_INT_TI);
495
496 /* Set the descriptor base address */
497 mci_writel(host, DBADDR, host->sg_dma);
498 return 0;
499 }
500
501 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
502 .init = dw_mci_idmac_init,
503 .start = dw_mci_idmac_start_dma,
504 .stop = dw_mci_idmac_stop_dma,
505 .complete = dw_mci_idmac_complete_dma,
506 .cleanup = dw_mci_dma_cleanup,
507 };
508 #endif /* CONFIG_MMC_DW_IDMAC */
509
510 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
511 struct mmc_data *data,
512 bool next)
513 {
514 struct scatterlist *sg;
515 unsigned int i, sg_len;
516
517 if (!next && data->host_cookie)
518 return data->host_cookie;
519
520 /*
521 * We don't do DMA on "complex" transfers, i.e. with
522 * non-word-aligned buffers or lengths. Also, we don't bother
523 * with all the DMA setup overhead for short transfers.
524 */
525 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
526 return -EINVAL;
527
528 if (data->blksz & 3)
529 return -EINVAL;
530
531 for_each_sg(data->sg, sg, data->sg_len, i) {
532 if (sg->offset & 3 || sg->length & 3)
533 return -EINVAL;
534 }
535
536 sg_len = dma_map_sg(host->dev,
537 data->sg,
538 data->sg_len,
539 dw_mci_get_dma_dir(data));
540 if (sg_len == 0)
541 return -EINVAL;
542
543 if (next)
544 data->host_cookie = sg_len;
545
546 return sg_len;
547 }
548
549 static void dw_mci_pre_req(struct mmc_host *mmc,
550 struct mmc_request *mrq,
551 bool is_first_req)
552 {
553 struct dw_mci_slot *slot = mmc_priv(mmc);
554 struct mmc_data *data = mrq->data;
555
556 if (!slot->host->use_dma || !data)
557 return;
558
559 if (data->host_cookie) {
560 data->host_cookie = 0;
561 return;
562 }
563
564 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
565 data->host_cookie = 0;
566 }
567
568 static void dw_mci_post_req(struct mmc_host *mmc,
569 struct mmc_request *mrq,
570 int err)
571 {
572 struct dw_mci_slot *slot = mmc_priv(mmc);
573 struct mmc_data *data = mrq->data;
574
575 if (!slot->host->use_dma || !data)
576 return;
577
578 if (data->host_cookie)
579 dma_unmap_sg(slot->host->dev,
580 data->sg,
581 data->sg_len,
582 dw_mci_get_dma_dir(data));
583 data->host_cookie = 0;
584 }
585
586 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
587 {
588 #ifdef CONFIG_MMC_DW_IDMAC
589 unsigned int blksz = data->blksz;
590 const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
591 u32 fifo_width = 1 << host->data_shift;
592 u32 blksz_depth = blksz / fifo_width, fifoth_val;
593 u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
594 int idx = (sizeof(mszs) / sizeof(mszs[0])) - 1;
595
596 tx_wmark = (host->fifo_depth) / 2;
597 tx_wmark_invers = host->fifo_depth - tx_wmark;
598
599 /*
600 * MSIZE is '1',
601 * if blksz is not a multiple of the FIFO width
602 */
603 if (blksz % fifo_width) {
604 msize = 0;
605 rx_wmark = 1;
606 goto done;
607 }
608
609 do {
610 if (!((blksz_depth % mszs[idx]) ||
611 (tx_wmark_invers % mszs[idx]))) {
612 msize = idx;
613 rx_wmark = mszs[idx] - 1;
614 break;
615 }
616 } while (--idx > 0);
617 /*
618 * If idx is '0', it won't be tried
619 * Thus, initial values are uesed
620 */
621 done:
622 fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
623 mci_writel(host, FIFOTH, fifoth_val);
624 #endif
625 }
626
627 static void dw_mci_ctrl_rd_thld(struct dw_mci *host, struct mmc_data *data)
628 {
629 unsigned int blksz = data->blksz;
630 u32 blksz_depth, fifo_depth;
631 u16 thld_size;
632
633 WARN_ON(!(data->flags & MMC_DATA_READ));
634
635 if (host->timing != MMC_TIMING_MMC_HS200 &&
636 host->timing != MMC_TIMING_UHS_SDR104)
637 goto disable;
638
639 blksz_depth = blksz / (1 << host->data_shift);
640 fifo_depth = host->fifo_depth;
641
642 if (blksz_depth > fifo_depth)
643 goto disable;
644
645 /*
646 * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
647 * If (blksz_depth) < (fifo_depth >> 1), should be thld_size = blksz
648 * Currently just choose blksz.
649 */
650 thld_size = blksz;
651 mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(thld_size, 1));
652 return;
653
654 disable:
655 mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(0, 0));
656 }
657
658 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
659 {
660 int sg_len;
661 u32 temp;
662
663 host->using_dma = 0;
664
665 /* If we don't have a channel, we can't do DMA */
666 if (!host->use_dma)
667 return -ENODEV;
668
669 sg_len = dw_mci_pre_dma_transfer(host, data, 0);
670 if (sg_len < 0) {
671 host->dma_ops->stop(host);
672 return sg_len;
673 }
674
675 host->using_dma = 1;
676
677 dev_vdbg(host->dev,
678 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
679 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
680 sg_len);
681
682 /*
683 * Decide the MSIZE and RX/TX Watermark.
684 * If current block size is same with previous size,
685 * no need to update fifoth.
686 */
687 if (host->prev_blksz != data->blksz)
688 dw_mci_adjust_fifoth(host, data);
689
690 /* Enable the DMA interface */
691 temp = mci_readl(host, CTRL);
692 temp |= SDMMC_CTRL_DMA_ENABLE;
693 mci_writel(host, CTRL, temp);
694
695 /* Disable RX/TX IRQs, let DMA handle it */
696 temp = mci_readl(host, INTMASK);
697 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
698 mci_writel(host, INTMASK, temp);
699
700 host->dma_ops->start(host, sg_len);
701
702 return 0;
703 }
704
705 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
706 {
707 u32 temp;
708
709 data->error = -EINPROGRESS;
710
711 WARN_ON(host->data);
712 host->sg = NULL;
713 host->data = data;
714
715 if (data->flags & MMC_DATA_READ) {
716 host->dir_status = DW_MCI_RECV_STATUS;
717 dw_mci_ctrl_rd_thld(host, data);
718 } else {
719 host->dir_status = DW_MCI_SEND_STATUS;
720 }
721
722 if (dw_mci_submit_data_dma(host, data)) {
723 int flags = SG_MITER_ATOMIC;
724 if (host->data->flags & MMC_DATA_READ)
725 flags |= SG_MITER_TO_SG;
726 else
727 flags |= SG_MITER_FROM_SG;
728
729 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
730 host->sg = data->sg;
731 host->part_buf_start = 0;
732 host->part_buf_count = 0;
733
734 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
735 temp = mci_readl(host, INTMASK);
736 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
737 mci_writel(host, INTMASK, temp);
738
739 temp = mci_readl(host, CTRL);
740 temp &= ~SDMMC_CTRL_DMA_ENABLE;
741 mci_writel(host, CTRL, temp);
742
743 /*
744 * Use the initial fifoth_val for PIO mode.
745 * If next issued data may be transfered by DMA mode,
746 * prev_blksz should be invalidated.
747 */
748 mci_writel(host, FIFOTH, host->fifoth_val);
749 host->prev_blksz = 0;
750 } else {
751 /*
752 * Keep the current block size.
753 * It will be used to decide whether to update
754 * fifoth register next time.
755 */
756 host->prev_blksz = data->blksz;
757 }
758 }
759
760 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
761 {
762 struct dw_mci *host = slot->host;
763 unsigned long timeout = jiffies + msecs_to_jiffies(500);
764 unsigned int cmd_status = 0;
765
766 mci_writel(host, CMDARG, arg);
767 wmb();
768 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
769
770 while (time_before(jiffies, timeout)) {
771 cmd_status = mci_readl(host, CMD);
772 if (!(cmd_status & SDMMC_CMD_START))
773 return;
774 }
775 dev_err(&slot->mmc->class_dev,
776 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
777 cmd, arg, cmd_status);
778 }
779
780 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
781 {
782 struct dw_mci *host = slot->host;
783 unsigned int clock = slot->clock;
784 u32 div;
785 u32 clk_en_a;
786
787 if (!clock) {
788 mci_writel(host, CLKENA, 0);
789 mci_send_cmd(slot,
790 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
791 } else if (clock != host->current_speed || force_clkinit) {
792 div = host->bus_hz / clock;
793 if (host->bus_hz % clock && host->bus_hz > clock)
794 /*
795 * move the + 1 after the divide to prevent
796 * over-clocking the card.
797 */
798 div += 1;
799
800 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
801
802 if ((clock << div) != slot->__clk_old || force_clkinit)
803 dev_info(&slot->mmc->class_dev,
804 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
805 slot->id, host->bus_hz, clock,
806 div ? ((host->bus_hz / div) >> 1) :
807 host->bus_hz, div);
808
809 /* disable clock */
810 mci_writel(host, CLKENA, 0);
811 mci_writel(host, CLKSRC, 0);
812
813 /* inform CIU */
814 mci_send_cmd(slot,
815 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
816
817 /* set clock to desired speed */
818 mci_writel(host, CLKDIV, div);
819
820 /* inform CIU */
821 mci_send_cmd(slot,
822 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
823
824 /* enable clock; only low power if no SDIO */
825 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
826 if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
827 clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
828 mci_writel(host, CLKENA, clk_en_a);
829
830 /* inform CIU */
831 mci_send_cmd(slot,
832 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
833
834 /* keep the clock with reflecting clock dividor */
835 slot->__clk_old = clock << div;
836 }
837
838 host->current_speed = clock;
839
840 /* Set the current slot bus width */
841 mci_writel(host, CTYPE, (slot->ctype << slot->id));
842 }
843
844 static void __dw_mci_start_request(struct dw_mci *host,
845 struct dw_mci_slot *slot,
846 struct mmc_command *cmd)
847 {
848 struct mmc_request *mrq;
849 struct mmc_data *data;
850 u32 cmdflags;
851
852 mrq = slot->mrq;
853 if (host->pdata->select_slot)
854 host->pdata->select_slot(slot->id);
855
856 host->cur_slot = slot;
857 host->mrq = mrq;
858
859 host->pending_events = 0;
860 host->completed_events = 0;
861 host->cmd_status = 0;
862 host->data_status = 0;
863 host->dir_status = 0;
864
865 data = cmd->data;
866 if (data) {
867 dw_mci_set_timeout(host);
868 mci_writel(host, BYTCNT, data->blksz*data->blocks);
869 mci_writel(host, BLKSIZ, data->blksz);
870 }
871
872 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
873
874 /* this is the first command, send the initialization clock */
875 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
876 cmdflags |= SDMMC_CMD_INIT;
877
878 if (data) {
879 dw_mci_submit_data(host, data);
880 wmb();
881 }
882
883 dw_mci_start_command(host, cmd, cmdflags);
884
885 if (mrq->stop)
886 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
887 else
888 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
889 }
890
891 static void dw_mci_start_request(struct dw_mci *host,
892 struct dw_mci_slot *slot)
893 {
894 struct mmc_request *mrq = slot->mrq;
895 struct mmc_command *cmd;
896
897 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
898 __dw_mci_start_request(host, slot, cmd);
899 }
900
901 /* must be called with host->lock held */
902 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
903 struct mmc_request *mrq)
904 {
905 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
906 host->state);
907
908 slot->mrq = mrq;
909
910 if (host->state == STATE_IDLE) {
911 host->state = STATE_SENDING_CMD;
912 dw_mci_start_request(host, slot);
913 } else {
914 list_add_tail(&slot->queue_node, &host->queue);
915 }
916 }
917
918 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
919 {
920 struct dw_mci_slot *slot = mmc_priv(mmc);
921 struct dw_mci *host = slot->host;
922
923 WARN_ON(slot->mrq);
924
925 /*
926 * The check for card presence and queueing of the request must be
927 * atomic, otherwise the card could be removed in between and the
928 * request wouldn't fail until another card was inserted.
929 */
930 spin_lock_bh(&host->lock);
931
932 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
933 spin_unlock_bh(&host->lock);
934 mrq->cmd->error = -ENOMEDIUM;
935 mmc_request_done(mmc, mrq);
936 return;
937 }
938
939 dw_mci_queue_request(host, slot, mrq);
940
941 spin_unlock_bh(&host->lock);
942 }
943
944 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
945 {
946 struct dw_mci_slot *slot = mmc_priv(mmc);
947 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
948 u32 regs;
949
950 switch (ios->bus_width) {
951 case MMC_BUS_WIDTH_4:
952 slot->ctype = SDMMC_CTYPE_4BIT;
953 break;
954 case MMC_BUS_WIDTH_8:
955 slot->ctype = SDMMC_CTYPE_8BIT;
956 break;
957 default:
958 /* set default 1 bit mode */
959 slot->ctype = SDMMC_CTYPE_1BIT;
960 }
961
962 regs = mci_readl(slot->host, UHS_REG);
963
964 /* DDR mode set */
965 if (ios->timing == MMC_TIMING_UHS_DDR50)
966 regs |= ((0x1 << slot->id) << 16);
967 else
968 regs &= ~((0x1 << slot->id) << 16);
969
970 mci_writel(slot->host, UHS_REG, regs);
971 slot->host->timing = ios->timing;
972
973 /*
974 * Use mirror of ios->clock to prevent race with mmc
975 * core ios update when finding the minimum.
976 */
977 slot->clock = ios->clock;
978
979 if (drv_data && drv_data->set_ios)
980 drv_data->set_ios(slot->host, ios);
981
982 /* Slot specific timing and width adjustment */
983 dw_mci_setup_bus(slot, false);
984
985 switch (ios->power_mode) {
986 case MMC_POWER_UP:
987 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
988 /* Power up slot */
989 if (slot->host->pdata->setpower)
990 slot->host->pdata->setpower(slot->id, mmc->ocr_avail);
991 regs = mci_readl(slot->host, PWREN);
992 regs |= (1 << slot->id);
993 mci_writel(slot->host, PWREN, regs);
994 break;
995 case MMC_POWER_OFF:
996 /* Power down slot */
997 if (slot->host->pdata->setpower)
998 slot->host->pdata->setpower(slot->id, 0);
999 regs = mci_readl(slot->host, PWREN);
1000 regs &= ~(1 << slot->id);
1001 mci_writel(slot->host, PWREN, regs);
1002 break;
1003 default:
1004 break;
1005 }
1006 }
1007
1008 static int dw_mci_get_ro(struct mmc_host *mmc)
1009 {
1010 int read_only;
1011 struct dw_mci_slot *slot = mmc_priv(mmc);
1012 struct dw_mci_board *brd = slot->host->pdata;
1013
1014 /* Use platform get_ro function, else try on board write protect */
1015 if (slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT)
1016 read_only = 0;
1017 else if (brd->get_ro)
1018 read_only = brd->get_ro(slot->id);
1019 else if (gpio_is_valid(slot->wp_gpio))
1020 read_only = gpio_get_value(slot->wp_gpio);
1021 else
1022 read_only =
1023 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1024
1025 dev_dbg(&mmc->class_dev, "card is %s\n",
1026 read_only ? "read-only" : "read-write");
1027
1028 return read_only;
1029 }
1030
1031 static int dw_mci_get_cd(struct mmc_host *mmc)
1032 {
1033 int present;
1034 struct dw_mci_slot *slot = mmc_priv(mmc);
1035 struct dw_mci_board *brd = slot->host->pdata;
1036 struct dw_mci *host = slot->host;
1037 int gpio_cd = mmc_gpio_get_cd(mmc);
1038
1039 /* Use platform get_cd function, else try onboard card detect */
1040 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
1041 present = 1;
1042 else if (brd->get_cd)
1043 present = !brd->get_cd(slot->id);
1044 else if (!IS_ERR_VALUE(gpio_cd))
1045 present = gpio_cd;
1046 else
1047 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1048 == 0 ? 1 : 0;
1049
1050 spin_lock_bh(&host->lock);
1051 if (present) {
1052 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1053 dev_dbg(&mmc->class_dev, "card is present\n");
1054 } else {
1055 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1056 dev_dbg(&mmc->class_dev, "card is not present\n");
1057 }
1058 spin_unlock_bh(&host->lock);
1059
1060 return present;
1061 }
1062
1063 /*
1064 * Disable lower power mode.
1065 *
1066 * Low power mode will stop the card clock when idle. According to the
1067 * description of the CLKENA register we should disable low power mode
1068 * for SDIO cards if we need SDIO interrupts to work.
1069 *
1070 * This function is fast if low power mode is already disabled.
1071 */
1072 static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
1073 {
1074 struct dw_mci *host = slot->host;
1075 u32 clk_en_a;
1076 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1077
1078 clk_en_a = mci_readl(host, CLKENA);
1079
1080 if (clk_en_a & clken_low_pwr) {
1081 mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
1082 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1083 SDMMC_CMD_PRV_DAT_WAIT, 0);
1084 }
1085 }
1086
1087 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1088 {
1089 struct dw_mci_slot *slot = mmc_priv(mmc);
1090 struct dw_mci *host = slot->host;
1091 u32 int_mask;
1092
1093 /* Enable/disable Slot Specific SDIO interrupt */
1094 int_mask = mci_readl(host, INTMASK);
1095 if (enb) {
1096 /*
1097 * Turn off low power mode if it was enabled. This is a bit of
1098 * a heavy operation and we disable / enable IRQs a lot, so
1099 * we'll leave low power mode disabled and it will get
1100 * re-enabled again in dw_mci_setup_bus().
1101 */
1102 dw_mci_disable_low_power(slot);
1103
1104 mci_writel(host, INTMASK,
1105 (int_mask | SDMMC_INT_SDIO(slot->id)));
1106 } else {
1107 mci_writel(host, INTMASK,
1108 (int_mask & ~SDMMC_INT_SDIO(slot->id)));
1109 }
1110 }
1111
1112 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1113 {
1114 struct dw_mci_slot *slot = mmc_priv(mmc);
1115 struct dw_mci *host = slot->host;
1116 const struct dw_mci_drv_data *drv_data = host->drv_data;
1117 struct dw_mci_tuning_data tuning_data;
1118 int err = -ENOSYS;
1119
1120 if (opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1121 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
1122 tuning_data.blk_pattern = tuning_blk_pattern_8bit;
1123 tuning_data.blksz = sizeof(tuning_blk_pattern_8bit);
1124 } else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
1125 tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1126 tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1127 } else {
1128 return -EINVAL;
1129 }
1130 } else if (opcode == MMC_SEND_TUNING_BLOCK) {
1131 tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1132 tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1133 } else {
1134 dev_err(host->dev,
1135 "Undefined command(%d) for tuning\n", opcode);
1136 return -EINVAL;
1137 }
1138
1139 if (drv_data && drv_data->execute_tuning)
1140 err = drv_data->execute_tuning(slot, opcode, &tuning_data);
1141 return err;
1142 }
1143
1144 static const struct mmc_host_ops dw_mci_ops = {
1145 .request = dw_mci_request,
1146 .pre_req = dw_mci_pre_req,
1147 .post_req = dw_mci_post_req,
1148 .set_ios = dw_mci_set_ios,
1149 .get_ro = dw_mci_get_ro,
1150 .get_cd = dw_mci_get_cd,
1151 .enable_sdio_irq = dw_mci_enable_sdio_irq,
1152 .execute_tuning = dw_mci_execute_tuning,
1153 };
1154
1155 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1156 __releases(&host->lock)
1157 __acquires(&host->lock)
1158 {
1159 struct dw_mci_slot *slot;
1160 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1161
1162 WARN_ON(host->cmd || host->data);
1163
1164 host->cur_slot->mrq = NULL;
1165 host->mrq = NULL;
1166 if (!list_empty(&host->queue)) {
1167 slot = list_entry(host->queue.next,
1168 struct dw_mci_slot, queue_node);
1169 list_del(&slot->queue_node);
1170 dev_vdbg(host->dev, "list not empty: %s is next\n",
1171 mmc_hostname(slot->mmc));
1172 host->state = STATE_SENDING_CMD;
1173 dw_mci_start_request(host, slot);
1174 } else {
1175 dev_vdbg(host->dev, "list empty\n");
1176 host->state = STATE_IDLE;
1177 }
1178
1179 spin_unlock(&host->lock);
1180 mmc_request_done(prev_mmc, mrq);
1181 spin_lock(&host->lock);
1182 }
1183
1184 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1185 {
1186 u32 status = host->cmd_status;
1187
1188 host->cmd_status = 0;
1189
1190 /* Read the response from the card (up to 16 bytes) */
1191 if (cmd->flags & MMC_RSP_PRESENT) {
1192 if (cmd->flags & MMC_RSP_136) {
1193 cmd->resp[3] = mci_readl(host, RESP0);
1194 cmd->resp[2] = mci_readl(host, RESP1);
1195 cmd->resp[1] = mci_readl(host, RESP2);
1196 cmd->resp[0] = mci_readl(host, RESP3);
1197 } else {
1198 cmd->resp[0] = mci_readl(host, RESP0);
1199 cmd->resp[1] = 0;
1200 cmd->resp[2] = 0;
1201 cmd->resp[3] = 0;
1202 }
1203 }
1204
1205 if (status & SDMMC_INT_RTO)
1206 cmd->error = -ETIMEDOUT;
1207 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1208 cmd->error = -EILSEQ;
1209 else if (status & SDMMC_INT_RESP_ERR)
1210 cmd->error = -EIO;
1211 else
1212 cmd->error = 0;
1213
1214 if (cmd->error) {
1215 /* newer ip versions need a delay between retries */
1216 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1217 mdelay(20);
1218 }
1219
1220 return cmd->error;
1221 }
1222
1223 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1224 {
1225 u32 status = host->data_status;
1226
1227 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1228 if (status & SDMMC_INT_DRTO) {
1229 data->error = -ETIMEDOUT;
1230 } else if (status & SDMMC_INT_DCRC) {
1231 data->error = -EILSEQ;
1232 } else if (status & SDMMC_INT_EBE) {
1233 if (host->dir_status ==
1234 DW_MCI_SEND_STATUS) {
1235 /*
1236 * No data CRC status was returned.
1237 * The number of bytes transferred
1238 * will be exaggerated in PIO mode.
1239 */
1240 data->bytes_xfered = 0;
1241 data->error = -ETIMEDOUT;
1242 } else if (host->dir_status ==
1243 DW_MCI_RECV_STATUS) {
1244 data->error = -EIO;
1245 }
1246 } else {
1247 /* SDMMC_INT_SBE is included */
1248 data->error = -EIO;
1249 }
1250
1251 dev_err(host->dev, "data error, status 0x%08x\n", status);
1252
1253 /*
1254 * After an error, there may be data lingering
1255 * in the FIFO
1256 */
1257 dw_mci_fifo_reset(host);
1258 } else {
1259 data->bytes_xfered = data->blocks * data->blksz;
1260 data->error = 0;
1261 }
1262
1263 return data->error;
1264 }
1265
1266 static void dw_mci_tasklet_func(unsigned long priv)
1267 {
1268 struct dw_mci *host = (struct dw_mci *)priv;
1269 struct mmc_data *data;
1270 struct mmc_command *cmd;
1271 struct mmc_request *mrq;
1272 enum dw_mci_state state;
1273 enum dw_mci_state prev_state;
1274 unsigned int err;
1275
1276 spin_lock(&host->lock);
1277
1278 state = host->state;
1279 data = host->data;
1280 mrq = host->mrq;
1281
1282 do {
1283 prev_state = state;
1284
1285 switch (state) {
1286 case STATE_IDLE:
1287 break;
1288
1289 case STATE_SENDING_CMD:
1290 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1291 &host->pending_events))
1292 break;
1293
1294 cmd = host->cmd;
1295 host->cmd = NULL;
1296 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1297 err = dw_mci_command_complete(host, cmd);
1298 if (cmd == mrq->sbc && !err) {
1299 prev_state = state = STATE_SENDING_CMD;
1300 __dw_mci_start_request(host, host->cur_slot,
1301 mrq->cmd);
1302 goto unlock;
1303 }
1304
1305 if (cmd->data && err) {
1306 dw_mci_stop_dma(host);
1307 send_stop_abort(host, data);
1308 state = STATE_SENDING_STOP;
1309 break;
1310 }
1311
1312 if (!cmd->data || err) {
1313 dw_mci_request_end(host, mrq);
1314 goto unlock;
1315 }
1316
1317 prev_state = state = STATE_SENDING_DATA;
1318 /* fall through */
1319
1320 case STATE_SENDING_DATA:
1321 if (test_and_clear_bit(EVENT_DATA_ERROR,
1322 &host->pending_events)) {
1323 dw_mci_stop_dma(host);
1324 send_stop_abort(host, data);
1325 state = STATE_DATA_ERROR;
1326 break;
1327 }
1328
1329 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1330 &host->pending_events))
1331 break;
1332
1333 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1334 prev_state = state = STATE_DATA_BUSY;
1335 /* fall through */
1336
1337 case STATE_DATA_BUSY:
1338 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1339 &host->pending_events))
1340 break;
1341
1342 host->data = NULL;
1343 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1344 err = dw_mci_data_complete(host, data);
1345
1346 if (!err) {
1347 if (!data->stop || mrq->sbc) {
1348 if (mrq->sbc)
1349 data->stop->error = 0;
1350 dw_mci_request_end(host, mrq);
1351 goto unlock;
1352 }
1353
1354 /* stop command for open-ended transfer*/
1355 if (data->stop)
1356 send_stop_abort(host, data);
1357 }
1358
1359 /*
1360 * If err has non-zero,
1361 * stop-abort command has been already issued.
1362 */
1363 prev_state = state = STATE_SENDING_STOP;
1364
1365 /* fall through */
1366
1367 case STATE_SENDING_STOP:
1368 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1369 &host->pending_events))
1370 break;
1371
1372 /* CMD error in data command */
1373 if (mrq->cmd->error && mrq->data)
1374 dw_mci_fifo_reset(host);
1375
1376 host->cmd = NULL;
1377 host->data = NULL;
1378
1379 if (mrq->stop)
1380 dw_mci_command_complete(host, mrq->stop);
1381 else
1382 host->cmd_status = 0;
1383
1384 dw_mci_request_end(host, mrq);
1385 goto unlock;
1386
1387 case STATE_DATA_ERROR:
1388 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1389 &host->pending_events))
1390 break;
1391
1392 state = STATE_DATA_BUSY;
1393 break;
1394 }
1395 } while (state != prev_state);
1396
1397 host->state = state;
1398 unlock:
1399 spin_unlock(&host->lock);
1400
1401 }
1402
1403 /* push final bytes to part_buf, only use during push */
1404 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1405 {
1406 memcpy((void *)&host->part_buf, buf, cnt);
1407 host->part_buf_count = cnt;
1408 }
1409
1410 /* append bytes to part_buf, only use during push */
1411 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1412 {
1413 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1414 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1415 host->part_buf_count += cnt;
1416 return cnt;
1417 }
1418
1419 /* pull first bytes from part_buf, only use during pull */
1420 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1421 {
1422 cnt = min(cnt, (int)host->part_buf_count);
1423 if (cnt) {
1424 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1425 cnt);
1426 host->part_buf_count -= cnt;
1427 host->part_buf_start += cnt;
1428 }
1429 return cnt;
1430 }
1431
1432 /* pull final bytes from the part_buf, assuming it's just been filled */
1433 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1434 {
1435 memcpy(buf, &host->part_buf, cnt);
1436 host->part_buf_start = cnt;
1437 host->part_buf_count = (1 << host->data_shift) - cnt;
1438 }
1439
1440 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1441 {
1442 struct mmc_data *data = host->data;
1443 int init_cnt = cnt;
1444
1445 /* try and push anything in the part_buf */
1446 if (unlikely(host->part_buf_count)) {
1447 int len = dw_mci_push_part_bytes(host, buf, cnt);
1448 buf += len;
1449 cnt -= len;
1450 if (host->part_buf_count == 2) {
1451 mci_writew(host, DATA(host->data_offset),
1452 host->part_buf16);
1453 host->part_buf_count = 0;
1454 }
1455 }
1456 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1457 if (unlikely((unsigned long)buf & 0x1)) {
1458 while (cnt >= 2) {
1459 u16 aligned_buf[64];
1460 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1461 int items = len >> 1;
1462 int i;
1463 /* memcpy from input buffer into aligned buffer */
1464 memcpy(aligned_buf, buf, len);
1465 buf += len;
1466 cnt -= len;
1467 /* push data from aligned buffer into fifo */
1468 for (i = 0; i < items; ++i)
1469 mci_writew(host, DATA(host->data_offset),
1470 aligned_buf[i]);
1471 }
1472 } else
1473 #endif
1474 {
1475 u16 *pdata = buf;
1476 for (; cnt >= 2; cnt -= 2)
1477 mci_writew(host, DATA(host->data_offset), *pdata++);
1478 buf = pdata;
1479 }
1480 /* put anything remaining in the part_buf */
1481 if (cnt) {
1482 dw_mci_set_part_bytes(host, buf, cnt);
1483 /* Push data if we have reached the expected data length */
1484 if ((data->bytes_xfered + init_cnt) ==
1485 (data->blksz * data->blocks))
1486 mci_writew(host, DATA(host->data_offset),
1487 host->part_buf16);
1488 }
1489 }
1490
1491 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1492 {
1493 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1494 if (unlikely((unsigned long)buf & 0x1)) {
1495 while (cnt >= 2) {
1496 /* pull data from fifo into aligned buffer */
1497 u16 aligned_buf[64];
1498 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1499 int items = len >> 1;
1500 int i;
1501 for (i = 0; i < items; ++i)
1502 aligned_buf[i] = mci_readw(host,
1503 DATA(host->data_offset));
1504 /* memcpy from aligned buffer into output buffer */
1505 memcpy(buf, aligned_buf, len);
1506 buf += len;
1507 cnt -= len;
1508 }
1509 } else
1510 #endif
1511 {
1512 u16 *pdata = buf;
1513 for (; cnt >= 2; cnt -= 2)
1514 *pdata++ = mci_readw(host, DATA(host->data_offset));
1515 buf = pdata;
1516 }
1517 if (cnt) {
1518 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1519 dw_mci_pull_final_bytes(host, buf, cnt);
1520 }
1521 }
1522
1523 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1524 {
1525 struct mmc_data *data = host->data;
1526 int init_cnt = cnt;
1527
1528 /* try and push anything in the part_buf */
1529 if (unlikely(host->part_buf_count)) {
1530 int len = dw_mci_push_part_bytes(host, buf, cnt);
1531 buf += len;
1532 cnt -= len;
1533 if (host->part_buf_count == 4) {
1534 mci_writel(host, DATA(host->data_offset),
1535 host->part_buf32);
1536 host->part_buf_count = 0;
1537 }
1538 }
1539 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1540 if (unlikely((unsigned long)buf & 0x3)) {
1541 while (cnt >= 4) {
1542 u32 aligned_buf[32];
1543 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1544 int items = len >> 2;
1545 int i;
1546 /* memcpy from input buffer into aligned buffer */
1547 memcpy(aligned_buf, buf, len);
1548 buf += len;
1549 cnt -= len;
1550 /* push data from aligned buffer into fifo */
1551 for (i = 0; i < items; ++i)
1552 mci_writel(host, DATA(host->data_offset),
1553 aligned_buf[i]);
1554 }
1555 } else
1556 #endif
1557 {
1558 u32 *pdata = buf;
1559 for (; cnt >= 4; cnt -= 4)
1560 mci_writel(host, DATA(host->data_offset), *pdata++);
1561 buf = pdata;
1562 }
1563 /* put anything remaining in the part_buf */
1564 if (cnt) {
1565 dw_mci_set_part_bytes(host, buf, cnt);
1566 /* Push data if we have reached the expected data length */
1567 if ((data->bytes_xfered + init_cnt) ==
1568 (data->blksz * data->blocks))
1569 mci_writel(host, DATA(host->data_offset),
1570 host->part_buf32);
1571 }
1572 }
1573
1574 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1575 {
1576 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1577 if (unlikely((unsigned long)buf & 0x3)) {
1578 while (cnt >= 4) {
1579 /* pull data from fifo into aligned buffer */
1580 u32 aligned_buf[32];
1581 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1582 int items = len >> 2;
1583 int i;
1584 for (i = 0; i < items; ++i)
1585 aligned_buf[i] = mci_readl(host,
1586 DATA(host->data_offset));
1587 /* memcpy from aligned buffer into output buffer */
1588 memcpy(buf, aligned_buf, len);
1589 buf += len;
1590 cnt -= len;
1591 }
1592 } else
1593 #endif
1594 {
1595 u32 *pdata = buf;
1596 for (; cnt >= 4; cnt -= 4)
1597 *pdata++ = mci_readl(host, DATA(host->data_offset));
1598 buf = pdata;
1599 }
1600 if (cnt) {
1601 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1602 dw_mci_pull_final_bytes(host, buf, cnt);
1603 }
1604 }
1605
1606 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1607 {
1608 struct mmc_data *data = host->data;
1609 int init_cnt = cnt;
1610
1611 /* try and push anything in the part_buf */
1612 if (unlikely(host->part_buf_count)) {
1613 int len = dw_mci_push_part_bytes(host, buf, cnt);
1614 buf += len;
1615 cnt -= len;
1616
1617 if (host->part_buf_count == 8) {
1618 mci_writeq(host, DATA(host->data_offset),
1619 host->part_buf);
1620 host->part_buf_count = 0;
1621 }
1622 }
1623 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1624 if (unlikely((unsigned long)buf & 0x7)) {
1625 while (cnt >= 8) {
1626 u64 aligned_buf[16];
1627 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1628 int items = len >> 3;
1629 int i;
1630 /* memcpy from input buffer into aligned buffer */
1631 memcpy(aligned_buf, buf, len);
1632 buf += len;
1633 cnt -= len;
1634 /* push data from aligned buffer into fifo */
1635 for (i = 0; i < items; ++i)
1636 mci_writeq(host, DATA(host->data_offset),
1637 aligned_buf[i]);
1638 }
1639 } else
1640 #endif
1641 {
1642 u64 *pdata = buf;
1643 for (; cnt >= 8; cnt -= 8)
1644 mci_writeq(host, DATA(host->data_offset), *pdata++);
1645 buf = pdata;
1646 }
1647 /* put anything remaining in the part_buf */
1648 if (cnt) {
1649 dw_mci_set_part_bytes(host, buf, cnt);
1650 /* Push data if we have reached the expected data length */
1651 if ((data->bytes_xfered + init_cnt) ==
1652 (data->blksz * data->blocks))
1653 mci_writeq(host, DATA(host->data_offset),
1654 host->part_buf);
1655 }
1656 }
1657
1658 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1659 {
1660 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1661 if (unlikely((unsigned long)buf & 0x7)) {
1662 while (cnt >= 8) {
1663 /* pull data from fifo into aligned buffer */
1664 u64 aligned_buf[16];
1665 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1666 int items = len >> 3;
1667 int i;
1668 for (i = 0; i < items; ++i)
1669 aligned_buf[i] = mci_readq(host,
1670 DATA(host->data_offset));
1671 /* memcpy from aligned buffer into output buffer */
1672 memcpy(buf, aligned_buf, len);
1673 buf += len;
1674 cnt -= len;
1675 }
1676 } else
1677 #endif
1678 {
1679 u64 *pdata = buf;
1680 for (; cnt >= 8; cnt -= 8)
1681 *pdata++ = mci_readq(host, DATA(host->data_offset));
1682 buf = pdata;
1683 }
1684 if (cnt) {
1685 host->part_buf = mci_readq(host, DATA(host->data_offset));
1686 dw_mci_pull_final_bytes(host, buf, cnt);
1687 }
1688 }
1689
1690 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1691 {
1692 int len;
1693
1694 /* get remaining partial bytes */
1695 len = dw_mci_pull_part_bytes(host, buf, cnt);
1696 if (unlikely(len == cnt))
1697 return;
1698 buf += len;
1699 cnt -= len;
1700
1701 /* get the rest of the data */
1702 host->pull_data(host, buf, cnt);
1703 }
1704
1705 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
1706 {
1707 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1708 void *buf;
1709 unsigned int offset;
1710 struct mmc_data *data = host->data;
1711 int shift = host->data_shift;
1712 u32 status;
1713 unsigned int len;
1714 unsigned int remain, fcnt;
1715
1716 do {
1717 if (!sg_miter_next(sg_miter))
1718 goto done;
1719
1720 host->sg = sg_miter->piter.sg;
1721 buf = sg_miter->addr;
1722 remain = sg_miter->length;
1723 offset = 0;
1724
1725 do {
1726 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1727 << shift) + host->part_buf_count;
1728 len = min(remain, fcnt);
1729 if (!len)
1730 break;
1731 dw_mci_pull_data(host, (void *)(buf + offset), len);
1732 data->bytes_xfered += len;
1733 offset += len;
1734 remain -= len;
1735 } while (remain);
1736
1737 sg_miter->consumed = offset;
1738 status = mci_readl(host, MINTSTS);
1739 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1740 /* if the RXDR is ready read again */
1741 } while ((status & SDMMC_INT_RXDR) ||
1742 (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
1743
1744 if (!remain) {
1745 if (!sg_miter_next(sg_miter))
1746 goto done;
1747 sg_miter->consumed = 0;
1748 }
1749 sg_miter_stop(sg_miter);
1750 return;
1751
1752 done:
1753 sg_miter_stop(sg_miter);
1754 host->sg = NULL;
1755 smp_wmb();
1756 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1757 }
1758
1759 static void dw_mci_write_data_pio(struct dw_mci *host)
1760 {
1761 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1762 void *buf;
1763 unsigned int offset;
1764 struct mmc_data *data = host->data;
1765 int shift = host->data_shift;
1766 u32 status;
1767 unsigned int len;
1768 unsigned int fifo_depth = host->fifo_depth;
1769 unsigned int remain, fcnt;
1770
1771 do {
1772 if (!sg_miter_next(sg_miter))
1773 goto done;
1774
1775 host->sg = sg_miter->piter.sg;
1776 buf = sg_miter->addr;
1777 remain = sg_miter->length;
1778 offset = 0;
1779
1780 do {
1781 fcnt = ((fifo_depth -
1782 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1783 << shift) - host->part_buf_count;
1784 len = min(remain, fcnt);
1785 if (!len)
1786 break;
1787 host->push_data(host, (void *)(buf + offset), len);
1788 data->bytes_xfered += len;
1789 offset += len;
1790 remain -= len;
1791 } while (remain);
1792
1793 sg_miter->consumed = offset;
1794 status = mci_readl(host, MINTSTS);
1795 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1796 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1797
1798 if (!remain) {
1799 if (!sg_miter_next(sg_miter))
1800 goto done;
1801 sg_miter->consumed = 0;
1802 }
1803 sg_miter_stop(sg_miter);
1804 return;
1805
1806 done:
1807 sg_miter_stop(sg_miter);
1808 host->sg = NULL;
1809 smp_wmb();
1810 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1811 }
1812
1813 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1814 {
1815 if (!host->cmd_status)
1816 host->cmd_status = status;
1817
1818 smp_wmb();
1819
1820 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1821 tasklet_schedule(&host->tasklet);
1822 }
1823
1824 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1825 {
1826 struct dw_mci *host = dev_id;
1827 u32 pending;
1828 int i;
1829
1830 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1831
1832 /*
1833 * DTO fix - version 2.10a and below, and only if internal DMA
1834 * is configured.
1835 */
1836 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1837 if (!pending &&
1838 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1839 pending |= SDMMC_INT_DATA_OVER;
1840 }
1841
1842 if (pending) {
1843 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1844 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1845 host->cmd_status = pending;
1846 smp_wmb();
1847 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1848 }
1849
1850 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1851 /* if there is an error report DATA_ERROR */
1852 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1853 host->data_status = pending;
1854 smp_wmb();
1855 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1856 tasklet_schedule(&host->tasklet);
1857 }
1858
1859 if (pending & SDMMC_INT_DATA_OVER) {
1860 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1861 if (!host->data_status)
1862 host->data_status = pending;
1863 smp_wmb();
1864 if (host->dir_status == DW_MCI_RECV_STATUS) {
1865 if (host->sg != NULL)
1866 dw_mci_read_data_pio(host, true);
1867 }
1868 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1869 tasklet_schedule(&host->tasklet);
1870 }
1871
1872 if (pending & SDMMC_INT_RXDR) {
1873 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1874 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1875 dw_mci_read_data_pio(host, false);
1876 }
1877
1878 if (pending & SDMMC_INT_TXDR) {
1879 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1880 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1881 dw_mci_write_data_pio(host);
1882 }
1883
1884 if (pending & SDMMC_INT_CMD_DONE) {
1885 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1886 dw_mci_cmd_interrupt(host, pending);
1887 }
1888
1889 if (pending & SDMMC_INT_CD) {
1890 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1891 queue_work(host->card_workqueue, &host->card_work);
1892 }
1893
1894 /* Handle SDIO Interrupts */
1895 for (i = 0; i < host->num_slots; i++) {
1896 struct dw_mci_slot *slot = host->slot[i];
1897 if (pending & SDMMC_INT_SDIO(i)) {
1898 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1899 mmc_signal_sdio_irq(slot->mmc);
1900 }
1901 }
1902
1903 }
1904
1905 #ifdef CONFIG_MMC_DW_IDMAC
1906 /* Handle DMA interrupts */
1907 pending = mci_readl(host, IDSTS);
1908 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1909 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1910 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1911 host->dma_ops->complete(host);
1912 }
1913 #endif
1914
1915 return IRQ_HANDLED;
1916 }
1917
1918 static void dw_mci_work_routine_card(struct work_struct *work)
1919 {
1920 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1921 int i;
1922
1923 for (i = 0; i < host->num_slots; i++) {
1924 struct dw_mci_slot *slot = host->slot[i];
1925 struct mmc_host *mmc = slot->mmc;
1926 struct mmc_request *mrq;
1927 int present;
1928
1929 present = dw_mci_get_cd(mmc);
1930 while (present != slot->last_detect_state) {
1931 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1932 present ? "inserted" : "removed");
1933
1934 spin_lock_bh(&host->lock);
1935
1936 /* Card change detected */
1937 slot->last_detect_state = present;
1938
1939 /* Clean up queue if present */
1940 mrq = slot->mrq;
1941 if (mrq) {
1942 if (mrq == host->mrq) {
1943 host->data = NULL;
1944 host->cmd = NULL;
1945
1946 switch (host->state) {
1947 case STATE_IDLE:
1948 break;
1949 case STATE_SENDING_CMD:
1950 mrq->cmd->error = -ENOMEDIUM;
1951 if (!mrq->data)
1952 break;
1953 /* fall through */
1954 case STATE_SENDING_DATA:
1955 mrq->data->error = -ENOMEDIUM;
1956 dw_mci_stop_dma(host);
1957 break;
1958 case STATE_DATA_BUSY:
1959 case STATE_DATA_ERROR:
1960 if (mrq->data->error == -EINPROGRESS)
1961 mrq->data->error = -ENOMEDIUM;
1962 /* fall through */
1963 case STATE_SENDING_STOP:
1964 if (mrq->stop)
1965 mrq->stop->error = -ENOMEDIUM;
1966 break;
1967 }
1968
1969 dw_mci_request_end(host, mrq);
1970 } else {
1971 list_del(&slot->queue_node);
1972 mrq->cmd->error = -ENOMEDIUM;
1973 if (mrq->data)
1974 mrq->data->error = -ENOMEDIUM;
1975 if (mrq->stop)
1976 mrq->stop->error = -ENOMEDIUM;
1977
1978 spin_unlock(&host->lock);
1979 mmc_request_done(slot->mmc, mrq);
1980 spin_lock(&host->lock);
1981 }
1982 }
1983
1984 /* Power down slot */
1985 if (present == 0) {
1986 /* Clear down the FIFO */
1987 dw_mci_fifo_reset(host);
1988 #ifdef CONFIG_MMC_DW_IDMAC
1989 dw_mci_idmac_reset(host);
1990 #endif
1991
1992 }
1993
1994 spin_unlock_bh(&host->lock);
1995
1996 present = dw_mci_get_cd(mmc);
1997 }
1998
1999 mmc_detect_change(slot->mmc,
2000 msecs_to_jiffies(host->pdata->detect_delay_ms));
2001 }
2002 }
2003
2004 #ifdef CONFIG_OF
2005 /* given a slot id, find out the device node representing that slot */
2006 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
2007 {
2008 struct device_node *np;
2009 const __be32 *addr;
2010 int len;
2011
2012 if (!dev || !dev->of_node)
2013 return NULL;
2014
2015 for_each_child_of_node(dev->of_node, np) {
2016 addr = of_get_property(np, "reg", &len);
2017 if (!addr || (len < sizeof(int)))
2018 continue;
2019 if (be32_to_cpup(addr) == slot)
2020 return np;
2021 }
2022 return NULL;
2023 }
2024
2025 static struct dw_mci_of_slot_quirks {
2026 char *quirk;
2027 int id;
2028 } of_slot_quirks[] = {
2029 {
2030 .quirk = "disable-wp",
2031 .id = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
2032 },
2033 };
2034
2035 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2036 {
2037 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2038 int quirks = 0;
2039 int idx;
2040
2041 /* get quirks */
2042 for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
2043 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL))
2044 quirks |= of_slot_quirks[idx].id;
2045
2046 return quirks;
2047 }
2048
2049 /* find out bus-width for a given slot */
2050 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
2051 {
2052 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2053 u32 bus_wd = 1;
2054
2055 if (!np)
2056 return 1;
2057
2058 if (of_property_read_u32(np, "bus-width", &bus_wd))
2059 dev_err(dev, "bus-width property not found, assuming width"
2060 " as 1\n");
2061 return bus_wd;
2062 }
2063
2064 /* find the write protect gpio for a given slot; or -1 if none specified */
2065 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
2066 {
2067 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2068 int gpio;
2069
2070 if (!np)
2071 return -EINVAL;
2072
2073 gpio = of_get_named_gpio(np, "wp-gpios", 0);
2074
2075 /* Having a missing entry is valid; return silently */
2076 if (!gpio_is_valid(gpio))
2077 return -EINVAL;
2078
2079 if (devm_gpio_request(dev, gpio, "dw-mci-wp")) {
2080 dev_warn(dev, "gpio [%d] request failed\n", gpio);
2081 return -EINVAL;
2082 }
2083
2084 return gpio;
2085 }
2086
2087 /* find the cd gpio for a given slot */
2088 static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
2089 struct mmc_host *mmc)
2090 {
2091 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2092 int gpio;
2093
2094 if (!np)
2095 return;
2096
2097 gpio = of_get_named_gpio(np, "cd-gpios", 0);
2098
2099 /* Having a missing entry is valid; return silently */
2100 if (!gpio_is_valid(gpio))
2101 return;
2102
2103 if (mmc_gpio_request_cd(mmc, gpio, 0))
2104 dev_warn(dev, "gpio [%d] request failed\n", gpio);
2105 }
2106 #else /* CONFIG_OF */
2107 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2108 {
2109 return 0;
2110 }
2111 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
2112 {
2113 return 1;
2114 }
2115 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
2116 {
2117 return NULL;
2118 }
2119 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
2120 {
2121 return -EINVAL;
2122 }
2123 static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
2124 struct mmc_host *mmc)
2125 {
2126 return;
2127 }
2128 #endif /* CONFIG_OF */
2129
2130 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2131 {
2132 struct mmc_host *mmc;
2133 struct dw_mci_slot *slot;
2134 const struct dw_mci_drv_data *drv_data = host->drv_data;
2135 int ctrl_id, ret;
2136 u32 freq[2];
2137 u8 bus_width;
2138
2139 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2140 if (!mmc)
2141 return -ENOMEM;
2142
2143 slot = mmc_priv(mmc);
2144 slot->id = id;
2145 slot->mmc = mmc;
2146 slot->host = host;
2147 host->slot[id] = slot;
2148
2149 slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
2150
2151 mmc->ops = &dw_mci_ops;
2152 if (of_property_read_u32_array(host->dev->of_node,
2153 "clock-freq-min-max", freq, 2)) {
2154 mmc->f_min = DW_MCI_FREQ_MIN;
2155 mmc->f_max = DW_MCI_FREQ_MAX;
2156 } else {
2157 mmc->f_min = freq[0];
2158 mmc->f_max = freq[1];
2159 }
2160
2161 if (host->pdata->get_ocr)
2162 mmc->ocr_avail = host->pdata->get_ocr(id);
2163 else
2164 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2165
2166 /*
2167 * Start with slot power disabled, it will be enabled when a card
2168 * is detected.
2169 */
2170 if (host->pdata->setpower)
2171 host->pdata->setpower(id, 0);
2172
2173 if (host->pdata->caps)
2174 mmc->caps = host->pdata->caps;
2175
2176 if (host->pdata->pm_caps)
2177 mmc->pm_caps = host->pdata->pm_caps;
2178
2179 if (host->dev->of_node) {
2180 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2181 if (ctrl_id < 0)
2182 ctrl_id = 0;
2183 } else {
2184 ctrl_id = to_platform_device(host->dev)->id;
2185 }
2186 if (drv_data && drv_data->caps)
2187 mmc->caps |= drv_data->caps[ctrl_id];
2188
2189 if (host->pdata->caps2)
2190 mmc->caps2 = host->pdata->caps2;
2191
2192 if (host->pdata->get_bus_wd)
2193 bus_width = host->pdata->get_bus_wd(slot->id);
2194 else if (host->dev->of_node)
2195 bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
2196 else
2197 bus_width = 1;
2198
2199 switch (bus_width) {
2200 case 8:
2201 mmc->caps |= MMC_CAP_8_BIT_DATA;
2202 case 4:
2203 mmc->caps |= MMC_CAP_4_BIT_DATA;
2204 }
2205
2206 if (host->pdata->blk_settings) {
2207 mmc->max_segs = host->pdata->blk_settings->max_segs;
2208 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
2209 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
2210 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
2211 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
2212 } else {
2213 /* Useful defaults if platform data is unset. */
2214 #ifdef CONFIG_MMC_DW_IDMAC
2215 mmc->max_segs = host->ring_size;
2216 mmc->max_blk_size = 65536;
2217 mmc->max_blk_count = host->ring_size;
2218 mmc->max_seg_size = 0x1000;
2219 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
2220 #else
2221 mmc->max_segs = 64;
2222 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
2223 mmc->max_blk_count = 512;
2224 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2225 mmc->max_seg_size = mmc->max_req_size;
2226 #endif /* CONFIG_MMC_DW_IDMAC */
2227 }
2228
2229 slot->wp_gpio = dw_mci_of_get_wp_gpio(host->dev, slot->id);
2230 dw_mci_of_get_cd_gpio(host->dev, slot->id, mmc);
2231
2232 ret = mmc_add_host(mmc);
2233 if (ret)
2234 goto err_setup_bus;
2235
2236 #if defined(CONFIG_DEBUG_FS)
2237 dw_mci_init_debugfs(slot);
2238 #endif
2239
2240 /* Card initially undetected */
2241 slot->last_detect_state = 0;
2242
2243 return 0;
2244
2245 err_setup_bus:
2246 mmc_free_host(mmc);
2247 return -EINVAL;
2248 }
2249
2250 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2251 {
2252 /* Shutdown detect IRQ */
2253 if (slot->host->pdata->exit)
2254 slot->host->pdata->exit(id);
2255
2256 /* Debugfs stuff is cleaned up by mmc core */
2257 mmc_remove_host(slot->mmc);
2258 slot->host->slot[id] = NULL;
2259 mmc_free_host(slot->mmc);
2260 }
2261
2262 static void dw_mci_init_dma(struct dw_mci *host)
2263 {
2264 /* Alloc memory for sg translation */
2265 host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2266 &host->sg_dma, GFP_KERNEL);
2267 if (!host->sg_cpu) {
2268 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2269 __func__);
2270 goto no_dma;
2271 }
2272
2273 /* Determine which DMA interface to use */
2274 #ifdef CONFIG_MMC_DW_IDMAC
2275 host->dma_ops = &dw_mci_idmac_ops;
2276 dev_info(host->dev, "Using internal DMA controller.\n");
2277 #endif
2278
2279 if (!host->dma_ops)
2280 goto no_dma;
2281
2282 if (host->dma_ops->init && host->dma_ops->start &&
2283 host->dma_ops->stop && host->dma_ops->cleanup) {
2284 if (host->dma_ops->init(host)) {
2285 dev_err(host->dev, "%s: Unable to initialize "
2286 "DMA Controller.\n", __func__);
2287 goto no_dma;
2288 }
2289 } else {
2290 dev_err(host->dev, "DMA initialization not found.\n");
2291 goto no_dma;
2292 }
2293
2294 host->use_dma = 1;
2295 return;
2296
2297 no_dma:
2298 dev_info(host->dev, "Using PIO mode.\n");
2299 host->use_dma = 0;
2300 return;
2301 }
2302
2303 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2304 {
2305 unsigned long timeout = jiffies + msecs_to_jiffies(500);
2306 u32 ctrl;
2307
2308 ctrl = mci_readl(host, CTRL);
2309 ctrl |= reset;
2310 mci_writel(host, CTRL, ctrl);
2311
2312 /* wait till resets clear */
2313 do {
2314 ctrl = mci_readl(host, CTRL);
2315 if (!(ctrl & reset))
2316 return true;
2317 } while (time_before(jiffies, timeout));
2318
2319 dev_err(host->dev,
2320 "Timeout resetting block (ctrl reset %#x)\n",
2321 ctrl & reset);
2322
2323 return false;
2324 }
2325
2326 static inline bool dw_mci_fifo_reset(struct dw_mci *host)
2327 {
2328 /*
2329 * Reseting generates a block interrupt, hence setting
2330 * the scatter-gather pointer to NULL.
2331 */
2332 if (host->sg) {
2333 sg_miter_stop(&host->sg_miter);
2334 host->sg = NULL;
2335 }
2336
2337 return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET);
2338 }
2339
2340 static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host)
2341 {
2342 return dw_mci_ctrl_reset(host,
2343 SDMMC_CTRL_FIFO_RESET |
2344 SDMMC_CTRL_RESET |
2345 SDMMC_CTRL_DMA_RESET);
2346 }
2347
2348 #ifdef CONFIG_OF
2349 static struct dw_mci_of_quirks {
2350 char *quirk;
2351 int id;
2352 } of_quirks[] = {
2353 {
2354 .quirk = "broken-cd",
2355 .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2356 },
2357 };
2358
2359 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2360 {
2361 struct dw_mci_board *pdata;
2362 struct device *dev = host->dev;
2363 struct device_node *np = dev->of_node;
2364 const struct dw_mci_drv_data *drv_data = host->drv_data;
2365 int idx, ret;
2366 u32 clock_frequency;
2367
2368 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2369 if (!pdata) {
2370 dev_err(dev, "could not allocate memory for pdata\n");
2371 return ERR_PTR(-ENOMEM);
2372 }
2373
2374 /* find out number of slots supported */
2375 if (of_property_read_u32(dev->of_node, "num-slots",
2376 &pdata->num_slots)) {
2377 dev_info(dev, "num-slots property not found, "
2378 "assuming 1 slot is available\n");
2379 pdata->num_slots = 1;
2380 }
2381
2382 /* get quirks */
2383 for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2384 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2385 pdata->quirks |= of_quirks[idx].id;
2386
2387 if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2388 dev_info(dev, "fifo-depth property not found, using "
2389 "value of FIFOTH register as default\n");
2390
2391 of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2392
2393 if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2394 pdata->bus_hz = clock_frequency;
2395
2396 if (drv_data && drv_data->parse_dt) {
2397 ret = drv_data->parse_dt(host);
2398 if (ret)
2399 return ERR_PTR(ret);
2400 }
2401
2402 if (of_find_property(np, "keep-power-in-suspend", NULL))
2403 pdata->pm_caps |= MMC_PM_KEEP_POWER;
2404
2405 if (of_find_property(np, "enable-sdio-wakeup", NULL))
2406 pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
2407
2408 if (of_find_property(np, "supports-highspeed", NULL))
2409 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2410
2411 if (of_find_property(np, "caps2-mmc-hs200-1_8v", NULL))
2412 pdata->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
2413
2414 if (of_find_property(np, "caps2-mmc-hs200-1_2v", NULL))
2415 pdata->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
2416
2417 if (of_get_property(np, "cd-inverted", NULL))
2418 pdata->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
2419
2420 return pdata;
2421 }
2422
2423 #else /* CONFIG_OF */
2424 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2425 {
2426 return ERR_PTR(-EINVAL);
2427 }
2428 #endif /* CONFIG_OF */
2429
2430 int dw_mci_probe(struct dw_mci *host)
2431 {
2432 const struct dw_mci_drv_data *drv_data = host->drv_data;
2433 int width, i, ret = 0;
2434 u32 fifo_size;
2435 int init_slots = 0;
2436
2437 if (!host->pdata) {
2438 host->pdata = dw_mci_parse_dt(host);
2439 if (IS_ERR(host->pdata)) {
2440 dev_err(host->dev, "platform data not available\n");
2441 return -EINVAL;
2442 }
2443 }
2444
2445 if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
2446 dev_err(host->dev,
2447 "Platform data must supply select_slot function\n");
2448 return -ENODEV;
2449 }
2450
2451 host->biu_clk = devm_clk_get(host->dev, "biu");
2452 if (IS_ERR(host->biu_clk)) {
2453 dev_dbg(host->dev, "biu clock not available\n");
2454 } else {
2455 ret = clk_prepare_enable(host->biu_clk);
2456 if (ret) {
2457 dev_err(host->dev, "failed to enable biu clock\n");
2458 return ret;
2459 }
2460 }
2461
2462 host->ciu_clk = devm_clk_get(host->dev, "ciu");
2463 if (IS_ERR(host->ciu_clk)) {
2464 dev_dbg(host->dev, "ciu clock not available\n");
2465 host->bus_hz = host->pdata->bus_hz;
2466 } else {
2467 ret = clk_prepare_enable(host->ciu_clk);
2468 if (ret) {
2469 dev_err(host->dev, "failed to enable ciu clock\n");
2470 goto err_clk_biu;
2471 }
2472
2473 if (host->pdata->bus_hz) {
2474 ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2475 if (ret)
2476 dev_warn(host->dev,
2477 "Unable to set bus rate to %ul\n",
2478 host->pdata->bus_hz);
2479 }
2480 host->bus_hz = clk_get_rate(host->ciu_clk);
2481 }
2482
2483 if (drv_data && drv_data->init) {
2484 ret = drv_data->init(host);
2485 if (ret) {
2486 dev_err(host->dev,
2487 "implementation specific init failed\n");
2488 goto err_clk_ciu;
2489 }
2490 }
2491
2492 if (drv_data && drv_data->setup_clock) {
2493 ret = drv_data->setup_clock(host);
2494 if (ret) {
2495 dev_err(host->dev,
2496 "implementation specific clock setup failed\n");
2497 goto err_clk_ciu;
2498 }
2499 }
2500
2501 host->vmmc = devm_regulator_get_optional(host->dev, "vmmc");
2502 if (IS_ERR(host->vmmc)) {
2503 ret = PTR_ERR(host->vmmc);
2504 if (ret == -EPROBE_DEFER)
2505 goto err_clk_ciu;
2506
2507 dev_info(host->dev, "no vmmc regulator found: %d\n", ret);
2508 host->vmmc = NULL;
2509 } else {
2510 ret = regulator_enable(host->vmmc);
2511 if (ret) {
2512 if (ret != -EPROBE_DEFER)
2513 dev_err(host->dev,
2514 "regulator_enable fail: %d\n", ret);
2515 goto err_clk_ciu;
2516 }
2517 }
2518
2519 if (!host->bus_hz) {
2520 dev_err(host->dev,
2521 "Platform data must supply bus speed\n");
2522 ret = -ENODEV;
2523 goto err_regulator;
2524 }
2525
2526 host->quirks = host->pdata->quirks;
2527
2528 spin_lock_init(&host->lock);
2529 INIT_LIST_HEAD(&host->queue);
2530
2531 /*
2532 * Get the host data width - this assumes that HCON has been set with
2533 * the correct values.
2534 */
2535 i = (mci_readl(host, HCON) >> 7) & 0x7;
2536 if (!i) {
2537 host->push_data = dw_mci_push_data16;
2538 host->pull_data = dw_mci_pull_data16;
2539 width = 16;
2540 host->data_shift = 1;
2541 } else if (i == 2) {
2542 host->push_data = dw_mci_push_data64;
2543 host->pull_data = dw_mci_pull_data64;
2544 width = 64;
2545 host->data_shift = 3;
2546 } else {
2547 /* Check for a reserved value, and warn if it is */
2548 WARN((i != 1),
2549 "HCON reports a reserved host data width!\n"
2550 "Defaulting to 32-bit access.\n");
2551 host->push_data = dw_mci_push_data32;
2552 host->pull_data = dw_mci_pull_data32;
2553 width = 32;
2554 host->data_shift = 2;
2555 }
2556
2557 /* Reset all blocks */
2558 if (!dw_mci_ctrl_all_reset(host))
2559 return -ENODEV;
2560
2561 host->dma_ops = host->pdata->dma_ops;
2562 dw_mci_init_dma(host);
2563
2564 /* Clear the interrupts for the host controller */
2565 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2566 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2567
2568 /* Put in max timeout */
2569 mci_writel(host, TMOUT, 0xFFFFFFFF);
2570
2571 /*
2572 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
2573 * Tx Mark = fifo_size / 2 DMA Size = 8
2574 */
2575 if (!host->pdata->fifo_depth) {
2576 /*
2577 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2578 * have been overwritten by the bootloader, just like we're
2579 * about to do, so if you know the value for your hardware, you
2580 * should put it in the platform data.
2581 */
2582 fifo_size = mci_readl(host, FIFOTH);
2583 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2584 } else {
2585 fifo_size = host->pdata->fifo_depth;
2586 }
2587 host->fifo_depth = fifo_size;
2588 host->fifoth_val =
2589 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
2590 mci_writel(host, FIFOTH, host->fifoth_val);
2591
2592 /* disable clock to CIU */
2593 mci_writel(host, CLKENA, 0);
2594 mci_writel(host, CLKSRC, 0);
2595
2596 /*
2597 * In 2.40a spec, Data offset is changed.
2598 * Need to check the version-id and set data-offset for DATA register.
2599 */
2600 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2601 dev_info(host->dev, "Version ID is %04x\n", host->verid);
2602
2603 if (host->verid < DW_MMC_240A)
2604 host->data_offset = DATA_OFFSET;
2605 else
2606 host->data_offset = DATA_240A_OFFSET;
2607
2608 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2609 host->card_workqueue = alloc_workqueue("dw-mci-card",
2610 WQ_MEM_RECLAIM, 1);
2611 if (!host->card_workqueue) {
2612 ret = -ENOMEM;
2613 goto err_dmaunmap;
2614 }
2615 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
2616 ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2617 host->irq_flags, "dw-mci", host);
2618 if (ret)
2619 goto err_workqueue;
2620
2621 if (host->pdata->num_slots)
2622 host->num_slots = host->pdata->num_slots;
2623 else
2624 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2625
2626 /*
2627 * Enable interrupts for command done, data over, data empty, card det,
2628 * receive ready and error such as transmit, receive timeout, crc error
2629 */
2630 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2631 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2632 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2633 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2634 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2635
2636 dev_info(host->dev, "DW MMC controller at irq %d, "
2637 "%d bit host data width, "
2638 "%u deep fifo\n",
2639 host->irq, width, fifo_size);
2640
2641 /* We need at least one slot to succeed */
2642 for (i = 0; i < host->num_slots; i++) {
2643 ret = dw_mci_init_slot(host, i);
2644 if (ret)
2645 dev_dbg(host->dev, "slot %d init failed\n", i);
2646 else
2647 init_slots++;
2648 }
2649
2650 if (init_slots) {
2651 dev_info(host->dev, "%d slots initialized\n", init_slots);
2652 } else {
2653 dev_dbg(host->dev, "attempted to initialize %d slots, "
2654 "but failed on all\n", host->num_slots);
2655 goto err_workqueue;
2656 }
2657
2658 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2659 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2660
2661 return 0;
2662
2663 err_workqueue:
2664 destroy_workqueue(host->card_workqueue);
2665
2666 err_dmaunmap:
2667 if (host->use_dma && host->dma_ops->exit)
2668 host->dma_ops->exit(host);
2669
2670 err_regulator:
2671 if (host->vmmc)
2672 regulator_disable(host->vmmc);
2673
2674 err_clk_ciu:
2675 if (!IS_ERR(host->ciu_clk))
2676 clk_disable_unprepare(host->ciu_clk);
2677
2678 err_clk_biu:
2679 if (!IS_ERR(host->biu_clk))
2680 clk_disable_unprepare(host->biu_clk);
2681
2682 return ret;
2683 }
2684 EXPORT_SYMBOL(dw_mci_probe);
2685
2686 void dw_mci_remove(struct dw_mci *host)
2687 {
2688 int i;
2689
2690 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2691 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2692
2693 for (i = 0; i < host->num_slots; i++) {
2694 dev_dbg(host->dev, "remove slot %d\n", i);
2695 if (host->slot[i])
2696 dw_mci_cleanup_slot(host->slot[i], i);
2697 }
2698
2699 /* disable clock to CIU */
2700 mci_writel(host, CLKENA, 0);
2701 mci_writel(host, CLKSRC, 0);
2702
2703 destroy_workqueue(host->card_workqueue);
2704
2705 if (host->use_dma && host->dma_ops->exit)
2706 host->dma_ops->exit(host);
2707
2708 if (host->vmmc)
2709 regulator_disable(host->vmmc);
2710
2711 if (!IS_ERR(host->ciu_clk))
2712 clk_disable_unprepare(host->ciu_clk);
2713
2714 if (!IS_ERR(host->biu_clk))
2715 clk_disable_unprepare(host->biu_clk);
2716 }
2717 EXPORT_SYMBOL(dw_mci_remove);
2718
2719
2720
2721 #ifdef CONFIG_PM_SLEEP
2722 /*
2723 * TODO: we should probably disable the clock to the card in the suspend path.
2724 */
2725 int dw_mci_suspend(struct dw_mci *host)
2726 {
2727 if (host->vmmc)
2728 regulator_disable(host->vmmc);
2729
2730 return 0;
2731 }
2732 EXPORT_SYMBOL(dw_mci_suspend);
2733
2734 int dw_mci_resume(struct dw_mci *host)
2735 {
2736 int i, ret;
2737
2738 if (host->vmmc) {
2739 ret = regulator_enable(host->vmmc);
2740 if (ret) {
2741 dev_err(host->dev,
2742 "failed to enable regulator: %d\n", ret);
2743 return ret;
2744 }
2745 }
2746
2747 if (!dw_mci_ctrl_all_reset(host)) {
2748 ret = -ENODEV;
2749 return ret;
2750 }
2751
2752 if (host->use_dma && host->dma_ops->init)
2753 host->dma_ops->init(host);
2754
2755 /*
2756 * Restore the initial value at FIFOTH register
2757 * And Invalidate the prev_blksz with zero
2758 */
2759 mci_writel(host, FIFOTH, host->fifoth_val);
2760 host->prev_blksz = 0;
2761
2762 /* Put in max timeout */
2763 mci_writel(host, TMOUT, 0xFFFFFFFF);
2764
2765 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2766 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2767 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2768 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2769 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2770
2771 for (i = 0; i < host->num_slots; i++) {
2772 struct dw_mci_slot *slot = host->slot[i];
2773 if (!slot)
2774 continue;
2775 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2776 dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2777 dw_mci_setup_bus(slot, true);
2778 }
2779 }
2780 return 0;
2781 }
2782 EXPORT_SYMBOL(dw_mci_resume);
2783 #endif /* CONFIG_PM_SLEEP */
2784
2785 static int __init dw_mci_init(void)
2786 {
2787 pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
2788 return 0;
2789 }
2790
2791 static void __exit dw_mci_exit(void)
2792 {
2793 }
2794
2795 module_init(dw_mci_init);
2796 module_exit(dw_mci_exit);
2797
2798 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2799 MODULE_AUTHOR("NXP Semiconductor VietNam");
2800 MODULE_AUTHOR("Imagination Technologies Ltd");
2801 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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