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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / mmc / host / tmio_mmc_pio.c
blob03f6e74c190691c74e4845bdd94401710baaed5c
1 /*
2 * linux/drivers/mmc/host/tmio_mmc_pio.c
3 *
4 * Copyright (C) 2016 Sang Engineering, Wolfram Sang
5 * Copyright (C) 2015-16 Renesas Electronics Corporation
6 * Copyright (C) 2011 Guennadi Liakhovetski
7 * Copyright (C) 2007 Ian Molton
8 * Copyright (C) 2004 Ian Molton
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * Driver for the MMC / SD / SDIO IP found in:
15 *
16 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
17 *
18 * This driver draws mainly on scattered spec sheets, Reverse engineering
19 * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
20 * support). (Further 4 bit support from a later datasheet).
21 *
22 * TODO:
23 * Investigate using a workqueue for PIO transfers
24 * Eliminate FIXMEs
25 * SDIO support
26 * Better Power management
27 * Handle MMC errors better
28 * double buffer support
29 *
30 */
31
32 #include <linux/delay.h>
33 #include <linux/device.h>
34 #include <linux/highmem.h>
35 #include <linux/interrupt.h>
36 #include <linux/io.h>
37 #include <linux/irq.h>
38 #include <linux/mfd/tmio.h>
39 #include <linux/mmc/host.h>
40 #include <linux/mmc/mmc.h>
41 #include <linux/mmc/slot-gpio.h>
42 #include <linux/mmc/tmio.h>
43 #include <linux/module.h>
44 #include <linux/pagemap.h>
45 #include <linux/platform_device.h>
46 #include <linux/pm_qos.h>
47 #include <linux/pm_runtime.h>
48 #include <linux/regulator/consumer.h>
49 #include <linux/mmc/sdio.h>
50 #include <linux/scatterlist.h>
51 #include <linux/spinlock.h>
52 #include <linux/workqueue.h>
53
54 #include "tmio_mmc.h"
55
56 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
57 {
58 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
59 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
60 }
61
62 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
63 {
64 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
65 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
66 }
67
68 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
69 {
70 sd_ctrl_write32(host, CTL_STATUS, ~i);
71 }
72
73 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
74 {
75 host->sg_len = data->sg_len;
76 host->sg_ptr = data->sg;
77 host->sg_orig = data->sg;
78 host->sg_off = 0;
79 }
80
81 static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
82 {
83 host->sg_ptr = sg_next(host->sg_ptr);
84 host->sg_off = 0;
85 return --host->sg_len;
86 }
87
88 #define CMDREQ_TIMEOUT 5000
89
90 #ifdef CONFIG_MMC_DEBUG
91
92 #define STATUS_TO_TEXT(a, status, i) \
93 do { \
94 if (status & TMIO_STAT_##a) { \
95 if (i++) \
96 printk(" | "); \
97 printk(#a); \
98 } \
99 } while (0)
100
101 static void pr_debug_status(u32 status)
102 {
103 int i = 0;
104 pr_debug("status: %08x = ", status);
105 STATUS_TO_TEXT(CARD_REMOVE, status, i);
106 STATUS_TO_TEXT(CARD_INSERT, status, i);
107 STATUS_TO_TEXT(SIGSTATE, status, i);
108 STATUS_TO_TEXT(WRPROTECT, status, i);
109 STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
110 STATUS_TO_TEXT(CARD_INSERT_A, status, i);
111 STATUS_TO_TEXT(SIGSTATE_A, status, i);
112 STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
113 STATUS_TO_TEXT(STOPBIT_ERR, status, i);
114 STATUS_TO_TEXT(ILL_FUNC, status, i);
115 STATUS_TO_TEXT(CMD_BUSY, status, i);
116 STATUS_TO_TEXT(CMDRESPEND, status, i);
117 STATUS_TO_TEXT(DATAEND, status, i);
118 STATUS_TO_TEXT(CRCFAIL, status, i);
119 STATUS_TO_TEXT(DATATIMEOUT, status, i);
120 STATUS_TO_TEXT(CMDTIMEOUT, status, i);
121 STATUS_TO_TEXT(RXOVERFLOW, status, i);
122 STATUS_TO_TEXT(TXUNDERRUN, status, i);
123 STATUS_TO_TEXT(RXRDY, status, i);
124 STATUS_TO_TEXT(TXRQ, status, i);
125 STATUS_TO_TEXT(ILL_ACCESS, status, i);
126 printk("\n");
127 }
128
129 #else
130 #define pr_debug_status(s) do { } while (0)
131 #endif
132
133 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
134 {
135 struct tmio_mmc_host *host = mmc_priv(mmc);
136
137 if (enable && !host->sdio_irq_enabled) {
138 /* Keep device active while SDIO irq is enabled */
139 pm_runtime_get_sync(mmc_dev(mmc));
140 host->sdio_irq_enabled = true;
141
142 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
143 ~TMIO_SDIO_STAT_IOIRQ;
144 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
145 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
146 } else if (!enable && host->sdio_irq_enabled) {
147 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
148 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
149 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
150
151 host->sdio_irq_enabled = false;
152 pm_runtime_mark_last_busy(mmc_dev(mmc));
153 pm_runtime_put_autosuspend(mmc_dev(mmc));
154 }
155 }
156
157 static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
158 unsigned int new_clock)
159 {
160 u32 clk = 0, clock;
161
162 if (new_clock) {
163 for (clock = host->mmc->f_min, clk = 0x80000080;
164 new_clock >= (clock << 1);
165 clk >>= 1)
166 clock <<= 1;
167
168 /* 1/1 clock is option */
169 if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) &&
170 ((clk >> 22) & 0x1))
171 clk |= 0xff;
172 }
173
174 if (host->set_clk_div)
175 host->set_clk_div(host->pdev, (clk >> 22) & 1);
176
177 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
178 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
179 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
180 if (!(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG))
181 msleep(10);
182 }
183
184 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
185 {
186 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
187 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
188 msleep(10);
189 }
190
191 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
192 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
193 msleep(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG ? 5 : 10);
194 }
195
196 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
197 {
198 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
199 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
200 msleep(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG ? 1 : 10);
201
202 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
203 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
204 msleep(10);
205 }
206 }
207
208 static void tmio_mmc_reset(struct tmio_mmc_host *host)
209 {
210 /* FIXME - should we set stop clock reg here */
211 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
212 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
213 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
214 msleep(10);
215 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
216 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
217 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
218 msleep(10);
219 }
220
221 static void tmio_mmc_reset_work(struct work_struct *work)
222 {
223 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
224 delayed_reset_work.work);
225 struct mmc_request *mrq;
226 unsigned long flags;
227
228 spin_lock_irqsave(&host->lock, flags);
229 mrq = host->mrq;
230
231 /*
232 * is request already finished? Since we use a non-blocking
233 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
234 * us, so, have to check for IS_ERR(host->mrq)
235 */
236 if (IS_ERR_OR_NULL(mrq)
237 || time_is_after_jiffies(host->last_req_ts +
238 msecs_to_jiffies(CMDREQ_TIMEOUT))) {
239 spin_unlock_irqrestore(&host->lock, flags);
240 return;
241 }
242
243 dev_warn(&host->pdev->dev,
244 "timeout waiting for hardware interrupt (CMD%u)\n",
245 mrq->cmd->opcode);
246
247 if (host->data)
248 host->data->error = -ETIMEDOUT;
249 else if (host->cmd)
250 host->cmd->error = -ETIMEDOUT;
251 else
252 mrq->cmd->error = -ETIMEDOUT;
253
254 host->cmd = NULL;
255 host->data = NULL;
256 host->force_pio = false;
257
258 spin_unlock_irqrestore(&host->lock, flags);
259
260 tmio_mmc_reset(host);
261
262 /* Ready for new calls */
263 host->mrq = NULL;
264
265 tmio_mmc_abort_dma(host);
266 mmc_request_done(host->mmc, mrq);
267
268 pm_runtime_mark_last_busy(mmc_dev(host->mmc));
269 pm_runtime_put_autosuspend(mmc_dev(host->mmc));
270 }
271
272 /* called with host->lock held, interrupts disabled */
273 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
274 {
275 struct mmc_request *mrq;
276 unsigned long flags;
277
278 spin_lock_irqsave(&host->lock, flags);
279
280 mrq = host->mrq;
281 if (IS_ERR_OR_NULL(mrq)) {
282 spin_unlock_irqrestore(&host->lock, flags);
283 return;
284 }
285
286 host->cmd = NULL;
287 host->data = NULL;
288 host->force_pio = false;
289
290 cancel_delayed_work(&host->delayed_reset_work);
291
292 host->mrq = NULL;
293 spin_unlock_irqrestore(&host->lock, flags);
294
295 if (mrq->cmd->error || (mrq->data && mrq->data->error))
296 tmio_mmc_abort_dma(host);
297
298 mmc_request_done(host->mmc, mrq);
299
300 pm_runtime_mark_last_busy(mmc_dev(host->mmc));
301 pm_runtime_put_autosuspend(mmc_dev(host->mmc));
302 }
303
304 static void tmio_mmc_done_work(struct work_struct *work)
305 {
306 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
307 done);
308 tmio_mmc_finish_request(host);
309 }
310
311 /* These are the bitmasks the tmio chip requires to implement the MMC response
312 * types. Note that R1 and R6 are the same in this scheme. */
313 #define APP_CMD 0x0040
314 #define RESP_NONE 0x0300
315 #define RESP_R1 0x0400
316 #define RESP_R1B 0x0500
317 #define RESP_R2 0x0600
318 #define RESP_R3 0x0700
319 #define DATA_PRESENT 0x0800
320 #define TRANSFER_READ 0x1000
321 #define TRANSFER_MULTI 0x2000
322 #define SECURITY_CMD 0x4000
323 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */
324
325 static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
326 {
327 struct mmc_data *data = host->data;
328 int c = cmd->opcode;
329 u32 irq_mask = TMIO_MASK_CMD;
330
331 /* CMD12 is handled by hardware */
332 if (cmd->opcode == MMC_STOP_TRANSMISSION && !cmd->arg) {
333 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
334 return 0;
335 }
336
337 switch (mmc_resp_type(cmd)) {
338 case MMC_RSP_NONE: c |= RESP_NONE; break;
339 case MMC_RSP_R1: c |= RESP_R1; break;
340 case MMC_RSP_R1B: c |= RESP_R1B; break;
341 case MMC_RSP_R2: c |= RESP_R2; break;
342 case MMC_RSP_R3: c |= RESP_R3; break;
343 default:
344 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
345 return -EINVAL;
346 }
347
348 host->cmd = cmd;
349
350 /* FIXME - this seems to be ok commented out but the spec suggest this bit
351 * should be set when issuing app commands.
352 * if(cmd->flags & MMC_FLAG_ACMD)
353 * c |= APP_CMD;
354 */
355 if (data) {
356 c |= DATA_PRESENT;
357 if (data->blocks > 1) {
358 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
359 c |= TRANSFER_MULTI;
360
361 /*
362 * Disable auto CMD12 at IO_RW_EXTENDED when
363 * multiple block transfer
364 */
365 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) &&
366 (cmd->opcode == SD_IO_RW_EXTENDED))
367 c |= NO_CMD12_ISSUE;
368 }
369 if (data->flags & MMC_DATA_READ)
370 c |= TRANSFER_READ;
371 }
372
373 if (!host->native_hotplug)
374 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
375 tmio_mmc_enable_mmc_irqs(host, irq_mask);
376
377 /* Fire off the command */
378 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
379 sd_ctrl_write16(host, CTL_SD_CMD, c);
380
381 return 0;
382 }
383
384 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
385 unsigned short *buf,
386 unsigned int count)
387 {
388 int is_read = host->data->flags & MMC_DATA_READ;
389 u8 *buf8;
390
391 /*
392 * Transfer the data
393 */
394 if (is_read)
395 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
396 else
397 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
398
399 /* if count was even number */
400 if (!(count & 0x1))
401 return;
402
403 /* if count was odd number */
404 buf8 = (u8 *)(buf + (count >> 1));
405
406 /*
407 * FIXME
408 *
409 * driver and this function are assuming that
410 * it is used as little endian
411 */
412 if (is_read)
413 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
414 else
415 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
416 }
417
418 /*
419 * This chip always returns (at least?) as much data as you ask for.
420 * I'm unsure what happens if you ask for less than a block. This should be
421 * looked into to ensure that a funny length read doesn't hose the controller.
422 */
423 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
424 {
425 struct mmc_data *data = host->data;
426 void *sg_virt;
427 unsigned short *buf;
428 unsigned int count;
429 unsigned long flags;
430
431 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
432 pr_err("PIO IRQ in DMA mode!\n");
433 return;
434 } else if (!data) {
435 pr_debug("Spurious PIO IRQ\n");
436 return;
437 }
438
439 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
440 buf = (unsigned short *)(sg_virt + host->sg_off);
441
442 count = host->sg_ptr->length - host->sg_off;
443 if (count > data->blksz)
444 count = data->blksz;
445
446 pr_debug("count: %08x offset: %08x flags %08x\n",
447 count, host->sg_off, data->flags);
448
449 /* Transfer the data */
450 tmio_mmc_transfer_data(host, buf, count);
451
452 host->sg_off += count;
453
454 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
455
456 if (host->sg_off == host->sg_ptr->length)
457 tmio_mmc_next_sg(host);
458
459 return;
460 }
461
462 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
463 {
464 if (host->sg_ptr == &host->bounce_sg) {
465 unsigned long flags;
466 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
467 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
468 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
469 }
470 }
471
472 /* needs to be called with host->lock held */
473 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
474 {
475 struct mmc_data *data = host->data;
476 struct mmc_command *stop;
477
478 host->data = NULL;
479
480 if (!data) {
481 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
482 return;
483 }
484 stop = data->stop;
485
486 /* FIXME - return correct transfer count on errors */
487 if (!data->error)
488 data->bytes_xfered = data->blocks * data->blksz;
489 else
490 data->bytes_xfered = 0;
491
492 pr_debug("Completed data request\n");
493
494 /*
495 * FIXME: other drivers allow an optional stop command of any given type
496 * which we dont do, as the chip can auto generate them.
497 * Perhaps we can be smarter about when to use auto CMD12 and
498 * only issue the auto request when we know this is the desired
499 * stop command, allowing fallback to the stop command the
500 * upper layers expect. For now, we do what works.
501 */
502
503 if (data->flags & MMC_DATA_READ) {
504 if (host->chan_rx && !host->force_pio)
505 tmio_mmc_check_bounce_buffer(host);
506 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
507 host->mrq);
508 } else {
509 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
510 host->mrq);
511 }
512
513 if (stop) {
514 if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
515 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
516 else
517 BUG();
518 }
519
520 schedule_work(&host->done);
521 }
522
523 static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
524 {
525 struct mmc_data *data;
526 spin_lock(&host->lock);
527 data = host->data;
528
529 if (!data)
530 goto out;
531
532 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
533 u32 status = sd_ctrl_read32(host, CTL_STATUS);
534 bool done = false;
535
536 /*
537 * Has all data been written out yet? Testing on SuperH showed,
538 * that in most cases the first interrupt comes already with the
539 * BUSY status bit clear, but on some operations, like mount or
540 * in the beginning of a write / sync / umount, there is one
541 * DATAEND interrupt with the BUSY bit set, in this cases
542 * waiting for one more interrupt fixes the problem.
543 */
544 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) {
545 if (status & TMIO_STAT_ILL_FUNC)
546 done = true;
547 } else {
548 if (!(status & TMIO_STAT_CMD_BUSY))
549 done = true;
550 }
551
552 if (done) {
553 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
554 tasklet_schedule(&host->dma_complete);
555 }
556 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
557 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
558 tasklet_schedule(&host->dma_complete);
559 } else {
560 tmio_mmc_do_data_irq(host);
561 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
562 }
563 out:
564 spin_unlock(&host->lock);
565 }
566
567 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
568 unsigned int stat)
569 {
570 struct mmc_command *cmd = host->cmd;
571 int i, addr;
572
573 spin_lock(&host->lock);
574
575 if (!host->cmd) {
576 pr_debug("Spurious CMD irq\n");
577 goto out;
578 }
579
580 host->cmd = NULL;
581
582 /* This controller is sicker than the PXA one. Not only do we need to
583 * drop the top 8 bits of the first response word, we also need to
584 * modify the order of the response for short response command types.
585 */
586
587 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
588 cmd->resp[i] = sd_ctrl_read32(host, addr);
589
590 if (cmd->flags & MMC_RSP_136) {
591 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
592 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
593 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
594 cmd->resp[3] <<= 8;
595 } else if (cmd->flags & MMC_RSP_R3) {
596 cmd->resp[0] = cmd->resp[3];
597 }
598
599 if (stat & TMIO_STAT_CMDTIMEOUT)
600 cmd->error = -ETIMEDOUT;
601 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
602 cmd->error = -EILSEQ;
603
604 /* If there is data to handle we enable data IRQs here, and
605 * we will ultimatley finish the request in the data_end handler.
606 * If theres no data or we encountered an error, finish now.
607 */
608 if (host->data && !cmd->error) {
609 if (host->data->flags & MMC_DATA_READ) {
610 if (host->force_pio || !host->chan_rx)
611 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
612 else
613 tasklet_schedule(&host->dma_issue);
614 } else {
615 if (host->force_pio || !host->chan_tx)
616 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
617 else
618 tasklet_schedule(&host->dma_issue);
619 }
620 } else {
621 schedule_work(&host->done);
622 }
623
624 out:
625 spin_unlock(&host->lock);
626 }
627
628 static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
629 int *ireg, int *status)
630 {
631 *status = sd_ctrl_read32(host, CTL_STATUS);
632 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
633
634 pr_debug_status(*status);
635 pr_debug_status(*ireg);
636
637 /* Clear the status except the interrupt status */
638 sd_ctrl_write32(host, CTL_STATUS, TMIO_MASK_IRQ);
639 }
640
641 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
642 int ireg, int status)
643 {
644 struct mmc_host *mmc = host->mmc;
645
646 /* Card insert / remove attempts */
647 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
648 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
649 TMIO_STAT_CARD_REMOVE);
650 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
651 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
652 !work_pending(&mmc->detect.work))
653 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
654 return true;
655 }
656
657 return false;
658 }
659
660 irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
661 {
662 unsigned int ireg, status;
663 struct tmio_mmc_host *host = devid;
664
665 tmio_mmc_card_irq_status(host, &ireg, &status);
666 __tmio_mmc_card_detect_irq(host, ireg, status);
667
668 return IRQ_HANDLED;
669 }
670 EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
671
672 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
673 int ireg, int status)
674 {
675 /* Command completion */
676 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
677 tmio_mmc_ack_mmc_irqs(host,
678 TMIO_STAT_CMDRESPEND |
679 TMIO_STAT_CMDTIMEOUT);
680 tmio_mmc_cmd_irq(host, status);
681 return true;
682 }
683
684 /* Data transfer */
685 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
686 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
687 tmio_mmc_pio_irq(host);
688 return true;
689 }
690
691 /* Data transfer completion */
692 if (ireg & TMIO_STAT_DATAEND) {
693 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
694 tmio_mmc_data_irq(host);
695 return true;
696 }
697
698 return false;
699 }
700
701 irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
702 {
703 unsigned int ireg, status;
704 struct tmio_mmc_host *host = devid;
705
706 tmio_mmc_card_irq_status(host, &ireg, &status);
707 __tmio_mmc_sdcard_irq(host, ireg, status);
708
709 return IRQ_HANDLED;
710 }
711 EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
712
713 irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
714 {
715 struct tmio_mmc_host *host = devid;
716 struct mmc_host *mmc = host->mmc;
717 struct tmio_mmc_data *pdata = host->pdata;
718 unsigned int ireg, status;
719 unsigned int sdio_status;
720
721 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
722 return IRQ_HANDLED;
723
724 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
725 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
726
727 sdio_status = status & ~TMIO_SDIO_MASK_ALL;
728 if (pdata->flags & TMIO_MMC_SDIO_STATUS_QUIRK)
729 sdio_status |= 6;
730
731 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
732
733 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
734 mmc_signal_sdio_irq(mmc);
735
736 return IRQ_HANDLED;
737 }
738 EXPORT_SYMBOL(tmio_mmc_sdio_irq);
739
740 irqreturn_t tmio_mmc_irq(int irq, void *devid)
741 {
742 struct tmio_mmc_host *host = devid;
743 unsigned int ireg, status;
744
745 pr_debug("MMC IRQ begin\n");
746
747 tmio_mmc_card_irq_status(host, &ireg, &status);
748 if (__tmio_mmc_card_detect_irq(host, ireg, status))
749 return IRQ_HANDLED;
750 if (__tmio_mmc_sdcard_irq(host, ireg, status))
751 return IRQ_HANDLED;
752
753 tmio_mmc_sdio_irq(irq, devid);
754
755 return IRQ_HANDLED;
756 }
757 EXPORT_SYMBOL(tmio_mmc_irq);
758
759 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
760 struct mmc_data *data)
761 {
762 struct tmio_mmc_data *pdata = host->pdata;
763
764 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
765 data->blksz, data->blocks);
766
767 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
768 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
769 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
770
771 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
772 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
773 mmc_hostname(host->mmc), data->blksz);
774 return -EINVAL;
775 }
776 }
777
778 tmio_mmc_init_sg(host, data);
779 host->data = data;
780
781 /* Set transfer length / blocksize */
782 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
783 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
784
785 tmio_mmc_start_dma(host, data);
786
787 return 0;
788 }
789
790 /* Process requests from the MMC layer */
791 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
792 {
793 struct tmio_mmc_host *host = mmc_priv(mmc);
794 unsigned long flags;
795 int ret;
796
797 spin_lock_irqsave(&host->lock, flags);
798
799 if (host->mrq) {
800 pr_debug("request not null\n");
801 if (IS_ERR(host->mrq)) {
802 spin_unlock_irqrestore(&host->lock, flags);
803 mrq->cmd->error = -EAGAIN;
804 mmc_request_done(mmc, mrq);
805 return;
806 }
807 }
808
809 host->last_req_ts = jiffies;
810 wmb();
811 host->mrq = mrq;
812
813 spin_unlock_irqrestore(&host->lock, flags);
814
815 pm_runtime_get_sync(mmc_dev(mmc));
816
817 if (mrq->data) {
818 ret = tmio_mmc_start_data(host, mrq->data);
819 if (ret)
820 goto fail;
821 }
822
823 ret = tmio_mmc_start_command(host, mrq->cmd);
824 if (!ret) {
825 schedule_delayed_work(&host->delayed_reset_work,
826 msecs_to_jiffies(CMDREQ_TIMEOUT));
827 return;
828 }
829
830 fail:
831 host->force_pio = false;
832 host->mrq = NULL;
833 mrq->cmd->error = ret;
834 mmc_request_done(mmc, mrq);
835
836 pm_runtime_mark_last_busy(mmc_dev(mmc));
837 pm_runtime_put_autosuspend(mmc_dev(mmc));
838 }
839
840 static int tmio_mmc_clk_update(struct tmio_mmc_host *host)
841 {
842 struct mmc_host *mmc = host->mmc;
843 int ret;
844
845 if (!host->clk_enable)
846 return -ENOTSUPP;
847
848 ret = host->clk_enable(host->pdev, &mmc->f_max);
849 if (!ret)
850 mmc->f_min = mmc->f_max / 512;
851
852 return ret;
853 }
854
855 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
856 {
857 struct mmc_host *mmc = host->mmc;
858 int ret = 0;
859
860 /* .set_ios() is returning void, so, no chance to report an error */
861
862 if (host->set_pwr)
863 host->set_pwr(host->pdev, 1);
864
865 if (!IS_ERR(mmc->supply.vmmc)) {
866 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
867 /*
868 * Attention: empiric value. With a b43 WiFi SDIO card this
869 * delay proved necessary for reliable card-insertion probing.
870 * 100us were not enough. Is this the same 140us delay, as in
871 * tmio_mmc_set_ios()?
872 */
873 udelay(200);
874 }
875 /*
876 * It seems, VccQ should be switched on after Vcc, this is also what the
877 * omap_hsmmc.c driver does.
878 */
879 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
880 ret = regulator_enable(mmc->supply.vqmmc);
881 udelay(200);
882 }
883
884 if (ret < 0)
885 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
886 ret);
887 }
888
889 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
890 {
891 struct mmc_host *mmc = host->mmc;
892
893 if (!IS_ERR(mmc->supply.vqmmc))
894 regulator_disable(mmc->supply.vqmmc);
895
896 if (!IS_ERR(mmc->supply.vmmc))
897 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
898
899 if (host->set_pwr)
900 host->set_pwr(host->pdev, 0);
901 }
902
903 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
904 unsigned char bus_width)
905 {
906 switch (bus_width) {
907 case MMC_BUS_WIDTH_1:
908 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
909 break;
910 case MMC_BUS_WIDTH_4:
911 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
912 break;
913 }
914 }
915
916 /* Set MMC clock / power.
917 * Note: This controller uses a simple divider scheme therefore it cannot
918 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
919 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
920 * slowest setting.
921 */
922 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
923 {
924 struct tmio_mmc_host *host = mmc_priv(mmc);
925 struct device *dev = &host->pdev->dev;
926 unsigned long flags;
927
928 pm_runtime_get_sync(mmc_dev(mmc));
929
930 mutex_lock(&host->ios_lock);
931
932 spin_lock_irqsave(&host->lock, flags);
933 if (host->mrq) {
934 if (IS_ERR(host->mrq)) {
935 dev_dbg(dev,
936 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
937 current->comm, task_pid_nr(current),
938 ios->clock, ios->power_mode);
939 host->mrq = ERR_PTR(-EINTR);
940 } else {
941 dev_dbg(dev,
942 "%s.%d: CMD%u active since %lu, now %lu!\n",
943 current->comm, task_pid_nr(current),
944 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
945 }
946 spin_unlock_irqrestore(&host->lock, flags);
947
948 mutex_unlock(&host->ios_lock);
949 return;
950 }
951
952 host->mrq = ERR_PTR(-EBUSY);
953
954 spin_unlock_irqrestore(&host->lock, flags);
955
956 switch (ios->power_mode) {
957 case MMC_POWER_OFF:
958 tmio_mmc_power_off(host);
959 tmio_mmc_clk_stop(host);
960 break;
961 case MMC_POWER_UP:
962 tmio_mmc_set_clock(host, ios->clock);
963 tmio_mmc_power_on(host, ios->vdd);
964 tmio_mmc_clk_start(host);
965 tmio_mmc_set_bus_width(host, ios->bus_width);
966 break;
967 case MMC_POWER_ON:
968 tmio_mmc_set_clock(host, ios->clock);
969 tmio_mmc_clk_start(host);
970 tmio_mmc_set_bus_width(host, ios->bus_width);
971 break;
972 }
973
974 /* Let things settle. delay taken from winCE driver */
975 udelay(140);
976 if (PTR_ERR(host->mrq) == -EINTR)
977 dev_dbg(&host->pdev->dev,
978 "%s.%d: IOS interrupted: clk %u, mode %u",
979 current->comm, task_pid_nr(current),
980 ios->clock, ios->power_mode);
981 host->mrq = NULL;
982
983 host->clk_cache = ios->clock;
984
985 mutex_unlock(&host->ios_lock);
986
987 pm_runtime_mark_last_busy(mmc_dev(mmc));
988 pm_runtime_put_autosuspend(mmc_dev(mmc));
989 }
990
991 static int tmio_mmc_get_ro(struct mmc_host *mmc)
992 {
993 struct tmio_mmc_host *host = mmc_priv(mmc);
994 struct tmio_mmc_data *pdata = host->pdata;
995 int ret = mmc_gpio_get_ro(mmc);
996 if (ret >= 0)
997 return ret;
998
999 pm_runtime_get_sync(mmc_dev(mmc));
1000 ret = !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
1001 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
1002 pm_runtime_mark_last_busy(mmc_dev(mmc));
1003 pm_runtime_put_autosuspend(mmc_dev(mmc));
1004
1005 return ret;
1006 }
1007
1008 static int tmio_multi_io_quirk(struct mmc_card *card,
1009 unsigned int direction, int blk_size)
1010 {
1011 struct tmio_mmc_host *host = mmc_priv(card->host);
1012
1013 if (host->multi_io_quirk)
1014 return host->multi_io_quirk(card, direction, blk_size);
1015
1016 return blk_size;
1017 }
1018
1019 static const struct mmc_host_ops tmio_mmc_ops = {
1020 .request = tmio_mmc_request,
1021 .set_ios = tmio_mmc_set_ios,
1022 .get_ro = tmio_mmc_get_ro,
1023 .get_cd = mmc_gpio_get_cd,
1024 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
1025 .multi_io_quirk = tmio_multi_io_quirk,
1026 };
1027
1028 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
1029 {
1030 struct tmio_mmc_data *pdata = host->pdata;
1031 struct mmc_host *mmc = host->mmc;
1032
1033 mmc_regulator_get_supply(mmc);
1034
1035 /* use ocr_mask if no regulator */
1036 if (!mmc->ocr_avail)
1037 mmc->ocr_avail = pdata->ocr_mask;
1038
1039 /*
1040 * try again.
1041 * There is possibility that regulator has not been probed
1042 */
1043 if (!mmc->ocr_avail)
1044 return -EPROBE_DEFER;
1045
1046 return 0;
1047 }
1048
1049 static void tmio_mmc_of_parse(struct platform_device *pdev,
1050 struct tmio_mmc_data *pdata)
1051 {
1052 const struct device_node *np = pdev->dev.of_node;
1053 if (!np)
1054 return;
1055
1056 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
1057 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
1058 }
1059
1060 struct tmio_mmc_host*
1061 tmio_mmc_host_alloc(struct platform_device *pdev)
1062 {
1063 struct tmio_mmc_host *host;
1064 struct mmc_host *mmc;
1065
1066 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
1067 if (!mmc)
1068 return NULL;
1069
1070 host = mmc_priv(mmc);
1071 host->mmc = mmc;
1072 host->pdev = pdev;
1073
1074 return host;
1075 }
1076 EXPORT_SYMBOL(tmio_mmc_host_alloc);
1077
1078 void tmio_mmc_host_free(struct tmio_mmc_host *host)
1079 {
1080 mmc_free_host(host->mmc);
1081 }
1082 EXPORT_SYMBOL(tmio_mmc_host_free);
1083
1084 int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
1085 struct tmio_mmc_data *pdata)
1086 {
1087 struct platform_device *pdev = _host->pdev;
1088 struct mmc_host *mmc = _host->mmc;
1089 struct resource *res_ctl;
1090 int ret;
1091 u32 irq_mask = TMIO_MASK_CMD;
1092
1093 tmio_mmc_of_parse(pdev, pdata);
1094
1095 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
1096 _host->write16_hook = NULL;
1097
1098 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1099 if (!res_ctl)
1100 return -EINVAL;
1101
1102 ret = mmc_of_parse(mmc);
1103 if (ret < 0)
1104 goto host_free;
1105
1106 _host->pdata = pdata;
1107 platform_set_drvdata(pdev, mmc);
1108
1109 _host->set_pwr = pdata->set_pwr;
1110 _host->set_clk_div = pdata->set_clk_div;
1111
1112 ret = tmio_mmc_init_ocr(_host);
1113 if (ret < 0)
1114 goto host_free;
1115
1116 _host->ctl = devm_ioremap(&pdev->dev,
1117 res_ctl->start, resource_size(res_ctl));
1118 if (!_host->ctl) {
1119 ret = -ENOMEM;
1120 goto host_free;
1121 }
1122
1123 mmc->ops = &tmio_mmc_ops;
1124 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1125 mmc->caps2 |= pdata->capabilities2;
1126 mmc->max_segs = 32;
1127 mmc->max_blk_size = 512;
1128 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
1129 mmc->max_segs;
1130 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1131 mmc->max_seg_size = mmc->max_req_size;
1132
1133 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
1134 mmc->caps & MMC_CAP_NEEDS_POLL ||
1135 mmc->caps & MMC_CAP_NONREMOVABLE ||
1136 mmc->slot.cd_irq >= 0);
1137
1138 if (tmio_mmc_clk_update(_host) < 0) {
1139 mmc->f_max = pdata->hclk;
1140 mmc->f_min = mmc->f_max / 512;
1141 }
1142
1143 /*
1144 * Check the sanity of mmc->f_min to prevent tmio_mmc_set_clock() from
1145 * looping forever...
1146 */
1147 if (mmc->f_min == 0) {
1148 ret = -EINVAL;
1149 goto host_free;
1150 }
1151
1152 /*
1153 * While using internal tmio hardware logic for card detection, we need
1154 * to ensure it stays powered for it to work.
1155 */
1156 if (_host->native_hotplug)
1157 pm_runtime_get_noresume(&pdev->dev);
1158
1159 tmio_mmc_clk_stop(_host);
1160 tmio_mmc_reset(_host);
1161
1162 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
1163 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1164
1165 /* Unmask the IRQs we want to know about */
1166 if (!_host->chan_rx)
1167 irq_mask |= TMIO_MASK_READOP;
1168 if (!_host->chan_tx)
1169 irq_mask |= TMIO_MASK_WRITEOP;
1170 if (!_host->native_hotplug)
1171 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1172
1173 _host->sdcard_irq_mask &= ~irq_mask;
1174
1175 _host->sdio_irq_enabled = false;
1176 if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
1177 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
1178 sd_ctrl_write16(_host, CTL_SDIO_IRQ_MASK, _host->sdio_irq_mask);
1179 sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0000);
1180 }
1181
1182 spin_lock_init(&_host->lock);
1183 mutex_init(&_host->ios_lock);
1184
1185 /* Init delayed work for request timeouts */
1186 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1187 INIT_WORK(&_host->done, tmio_mmc_done_work);
1188
1189 /* See if we also get DMA */
1190 tmio_mmc_request_dma(_host, pdata);
1191
1192 pm_runtime_set_active(&pdev->dev);
1193 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1194 pm_runtime_use_autosuspend(&pdev->dev);
1195 pm_runtime_enable(&pdev->dev);
1196
1197 ret = mmc_add_host(mmc);
1198 if (ret < 0) {
1199 tmio_mmc_host_remove(_host);
1200 return ret;
1201 }
1202
1203 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1204
1205 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
1206 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
1207 if (ret < 0) {
1208 tmio_mmc_host_remove(_host);
1209 return ret;
1210 }
1211 mmc_gpiod_request_cd_irq(mmc);
1212 }
1213
1214 return 0;
1215
1216 host_free:
1217
1218 return ret;
1219 }
1220 EXPORT_SYMBOL(tmio_mmc_host_probe);
1221
1222 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1223 {
1224 struct platform_device *pdev = host->pdev;
1225 struct mmc_host *mmc = host->mmc;
1226
1227 if (!host->native_hotplug)
1228 pm_runtime_get_sync(&pdev->dev);
1229
1230 dev_pm_qos_hide_latency_limit(&pdev->dev);
1231
1232 mmc_remove_host(mmc);
1233 cancel_work_sync(&host->done);
1234 cancel_delayed_work_sync(&host->delayed_reset_work);
1235 tmio_mmc_release_dma(host);
1236
1237 pm_runtime_put_sync(&pdev->dev);
1238 pm_runtime_disable(&pdev->dev);
1239 }
1240 EXPORT_SYMBOL(tmio_mmc_host_remove);
1241
1242 #ifdef CONFIG_PM
1243 int tmio_mmc_host_runtime_suspend(struct device *dev)
1244 {
1245 struct mmc_host *mmc = dev_get_drvdata(dev);
1246 struct tmio_mmc_host *host = mmc_priv(mmc);
1247
1248 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1249
1250 if (host->clk_cache)
1251 tmio_mmc_clk_stop(host);
1252
1253 if (host->clk_disable)
1254 host->clk_disable(host->pdev);
1255
1256 return 0;
1257 }
1258 EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1259
1260 int tmio_mmc_host_runtime_resume(struct device *dev)
1261 {
1262 struct mmc_host *mmc = dev_get_drvdata(dev);
1263 struct tmio_mmc_host *host = mmc_priv(mmc);
1264
1265 tmio_mmc_reset(host);
1266 tmio_mmc_clk_update(host);
1267
1268 if (host->clk_cache) {
1269 tmio_mmc_set_clock(host, host->clk_cache);
1270 tmio_mmc_clk_start(host);
1271 }
1272
1273 tmio_mmc_enable_dma(host, true);
1274
1275 return 0;
1276 }
1277 EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1278 #endif
1279
1280 MODULE_LICENSE("GPL v2");
CRIS linux kernel tree