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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / mmc / host / tmio_mmc_core.c
blob45a474ccab1c9802a67be15d065410c6465f3678
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for the MMC / SD / SDIO IP found in:
4 *
5 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
6 *
7 * Copyright (C) 2015-19 Renesas Electronics Corporation
8 * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
9 * Copyright (C) 2017 Horms Solutions, Simon Horman
10 * Copyright (C) 2011 Guennadi Liakhovetski
11 * Copyright (C) 2007 Ian Molton
12 * Copyright (C) 2004 Ian Molton
13 *
14 * This driver draws mainly on scattered spec sheets, Reverse engineering
15 * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
16 * support). (Further 4 bit support from a later datasheet).
17 *
18 * TODO:
19 * Investigate using a workqueue for PIO transfers
20 * Eliminate FIXMEs
21 * Better Power management
22 * Handle MMC errors better
23 * double buffer support
24 *
25 */
26
27 #include <linux/delay.h>
28 #include <linux/device.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/highmem.h>
31 #include <linux/interrupt.h>
32 #include <linux/io.h>
33 #include <linux/irq.h>
34 #include <linux/mmc/card.h>
35 #include <linux/mmc/host.h>
36 #include <linux/mmc/mmc.h>
37 #include <linux/mmc/slot-gpio.h>
38 #include <linux/module.h>
39 #include <linux/of.h>
40 #include <linux/pagemap.h>
41 #include <linux/platform_data/tmio.h>
42 #include <linux/platform_device.h>
43 #include <linux/pm_qos.h>
44 #include <linux/pm_runtime.h>
45 #include <linux/regulator/consumer.h>
46 #include <linux/mmc/sdio.h>
47 #include <linux/scatterlist.h>
48 #include <linux/sizes.h>
49 #include <linux/spinlock.h>
50 #include <linux/workqueue.h>
51
52 #include "tmio_mmc.h"
53
54 static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
55 struct mmc_data *data)
56 {
57 if (host->dma_ops)
58 host->dma_ops->start(host, data);
59 }
60
61 static inline void tmio_mmc_end_dma(struct tmio_mmc_host *host)
62 {
63 if (host->dma_ops && host->dma_ops->end)
64 host->dma_ops->end(host);
65 }
66
67 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
68 {
69 if (host->dma_ops)
70 host->dma_ops->enable(host, enable);
71 }
72
73 static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
74 struct tmio_mmc_data *pdata)
75 {
76 if (host->dma_ops) {
77 host->dma_ops->request(host, pdata);
78 } else {
79 host->chan_tx = NULL;
80 host->chan_rx = NULL;
81 }
82 }
83
84 static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
85 {
86 if (host->dma_ops)
87 host->dma_ops->release(host);
88 }
89
90 static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
91 {
92 if (host->dma_ops)
93 host->dma_ops->abort(host);
94 }
95
96 static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host)
97 {
98 if (host->dma_ops)
99 host->dma_ops->dataend(host);
100 }
101
102 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
103 {
104 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
105 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
106 }
107 EXPORT_SYMBOL_GPL(tmio_mmc_enable_mmc_irqs);
108
109 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
110 {
111 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
112 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
113 }
114 EXPORT_SYMBOL_GPL(tmio_mmc_disable_mmc_irqs);
115
116 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
117 {
118 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i);
119 }
120
121 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
122 {
123 host->sg_len = data->sg_len;
124 host->sg_ptr = data->sg;
125 host->sg_orig = data->sg;
126 host->sg_off = 0;
127 }
128
129 static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
130 {
131 host->sg_ptr = sg_next(host->sg_ptr);
132 host->sg_off = 0;
133 return --host->sg_len;
134 }
135
136 #define CMDREQ_TIMEOUT 5000
137
138 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
139 {
140 struct tmio_mmc_host *host = mmc_priv(mmc);
141
142 if (enable && !host->sdio_irq_enabled) {
143 u16 sdio_status;
144
145 /* Keep device active while SDIO irq is enabled */
146 pm_runtime_get_sync(mmc_dev(mmc));
147
148 host->sdio_irq_enabled = true;
149 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ;
150
151 /* Clear obsolete interrupts before enabling */
152 sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS) & ~TMIO_SDIO_MASK_ALL;
153 if (host->pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
154 sdio_status |= TMIO_SDIO_SETBITS_MASK;
155 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
156
157 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
158 } else if (!enable && host->sdio_irq_enabled) {
159 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
160 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
161
162 host->sdio_irq_enabled = false;
163 pm_runtime_mark_last_busy(mmc_dev(mmc));
164 pm_runtime_put_autosuspend(mmc_dev(mmc));
165 }
166 }
167
168 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
169 unsigned char bus_width)
170 {
171 u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
172 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
173
174 /* reg now applies to MMC_BUS_WIDTH_4 */
175 if (bus_width == MMC_BUS_WIDTH_1)
176 reg |= CARD_OPT_WIDTH;
177 else if (bus_width == MMC_BUS_WIDTH_8)
178 reg |= CARD_OPT_WIDTH8;
179
180 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
181 }
182
183 static void tmio_mmc_reset(struct tmio_mmc_host *host, bool preserve)
184 {
185 u16 card_opt, clk_ctrl, sdif_mode;
186
187 if (preserve) {
188 card_opt = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
189 clk_ctrl = sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL);
190 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2)
191 sdif_mode = sd_ctrl_read16(host, CTL_SDIF_MODE);
192 }
193
194 /* FIXME - should we set stop clock reg here */
195 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
196 usleep_range(10000, 11000);
197 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
198 usleep_range(10000, 11000);
199
200 tmio_mmc_abort_dma(host);
201
202 if (host->reset)
203 host->reset(host, preserve);
204
205 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask_all);
206 host->sdcard_irq_mask = host->sdcard_irq_mask_all;
207
208 if (host->native_hotplug)
209 tmio_mmc_enable_mmc_irqs(host,
210 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
211
212 tmio_mmc_set_bus_width(host, host->mmc->ios.bus_width);
213
214 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
215 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
216 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
217 }
218
219 if (preserve) {
220 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, card_opt);
221 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk_ctrl);
222 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2)
223 sd_ctrl_write16(host, CTL_SDIF_MODE, sdif_mode);
224 }
225
226 if (host->mmc->card)
227 mmc_retune_needed(host->mmc);
228 }
229
230 static void tmio_mmc_reset_work(struct work_struct *work)
231 {
232 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
233 delayed_reset_work.work);
234 struct mmc_request *mrq;
235 unsigned long flags;
236
237 spin_lock_irqsave(&host->lock, flags);
238 mrq = host->mrq;
239
240 /*
241 * is request already finished? Since we use a non-blocking
242 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
243 * us, so, have to check for IS_ERR(host->mrq)
244 */
245 if (IS_ERR_OR_NULL(mrq) ||
246 time_is_after_jiffies(host->last_req_ts +
247 msecs_to_jiffies(CMDREQ_TIMEOUT))) {
248 spin_unlock_irqrestore(&host->lock, flags);
249 return;
250 }
251
252 dev_warn(&host->pdev->dev,
253 "timeout waiting for hardware interrupt (CMD%u)\n",
254 mrq->cmd->opcode);
255
256 if (host->data)
257 host->data->error = -ETIMEDOUT;
258 else if (host->cmd)
259 host->cmd->error = -ETIMEDOUT;
260 else
261 mrq->cmd->error = -ETIMEDOUT;
262
263 /* No new calls yet, but disallow concurrent tmio_mmc_done_work() */
264 host->mrq = ERR_PTR(-EBUSY);
265 host->cmd = NULL;
266 host->data = NULL;
267
268 spin_unlock_irqrestore(&host->lock, flags);
269
270 tmio_mmc_reset(host, true);
271
272 /* Ready for new calls */
273 host->mrq = NULL;
274 mmc_request_done(host->mmc, mrq);
275 }
276
277 /* These are the bitmasks the tmio chip requires to implement the MMC response
278 * types. Note that R1 and R6 are the same in this scheme. */
279 #define APP_CMD 0x0040
280 #define RESP_NONE 0x0300
281 #define RESP_R1 0x0400
282 #define RESP_R1B 0x0500
283 #define RESP_R2 0x0600
284 #define RESP_R3 0x0700
285 #define DATA_PRESENT 0x0800
286 #define TRANSFER_READ 0x1000
287 #define TRANSFER_MULTI 0x2000
288 #define SECURITY_CMD 0x4000
289 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */
290
291 static int tmio_mmc_start_command(struct tmio_mmc_host *host,
292 struct mmc_command *cmd)
293 {
294 struct mmc_data *data = host->data;
295 int c = cmd->opcode;
296
297 switch (mmc_resp_type(cmd)) {
298 case MMC_RSP_NONE: c |= RESP_NONE; break;
299 case MMC_RSP_R1:
300 case MMC_RSP_R1_NO_CRC:
301 c |= RESP_R1; break;
302 case MMC_RSP_R1B: c |= RESP_R1B; break;
303 case MMC_RSP_R2: c |= RESP_R2; break;
304 case MMC_RSP_R3: c |= RESP_R3; break;
305 default:
306 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
307 return -EINVAL;
308 }
309
310 host->cmd = cmd;
311
312 /* FIXME - this seems to be ok commented out but the spec suggest this bit
313 * should be set when issuing app commands.
314 * if(cmd->flags & MMC_FLAG_ACMD)
315 * c |= APP_CMD;
316 */
317 if (data) {
318 c |= DATA_PRESENT;
319 if (data->blocks > 1) {
320 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC);
321 c |= TRANSFER_MULTI;
322
323 /*
324 * Disable auto CMD12 at IO_RW_EXTENDED and
325 * SET_BLOCK_COUNT when doing multiple block transfer
326 */
327 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) &&
328 (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc))
329 c |= NO_CMD12_ISSUE;
330 }
331 if (data->flags & MMC_DATA_READ)
332 c |= TRANSFER_READ;
333 }
334
335 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD);
336
337 /* Fire off the command */
338 sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg);
339 sd_ctrl_write16(host, CTL_SD_CMD, c);
340
341 return 0;
342 }
343
344 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
345 unsigned short *buf,
346 unsigned int count)
347 {
348 int is_read = host->data->flags & MMC_DATA_READ;
349 u8 *buf8;
350
351 /*
352 * Transfer the data
353 */
354 if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) {
355 u32 data = 0;
356 u32 *buf32 = (u32 *)buf;
357
358 if (is_read)
359 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32,
360 count >> 2);
361 else
362 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32,
363 count >> 2);
364
365 /* if count was multiple of 4 */
366 if (!(count & 0x3))
367 return;
368
369 buf32 += count >> 2;
370 count %= 4;
371
372 if (is_read) {
373 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1);
374 memcpy(buf32, &data, count);
375 } else {
376 memcpy(&data, buf32, count);
377 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1);
378 }
379
380 return;
381 }
382
383 if (is_read)
384 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
385 else
386 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
387
388 /* if count was even number */
389 if (!(count & 0x1))
390 return;
391
392 /* if count was odd number */
393 buf8 = (u8 *)(buf + (count >> 1));
394
395 /*
396 * FIXME
397 *
398 * driver and this function are assuming that
399 * it is used as little endian
400 */
401 if (is_read)
402 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
403 else
404 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
405 }
406
407 /*
408 * This chip always returns (at least?) as much data as you ask for.
409 * I'm unsure what happens if you ask for less than a block. This should be
410 * looked into to ensure that a funny length read doesn't hose the controller.
411 */
412 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
413 {
414 struct mmc_data *data = host->data;
415 void *sg_virt;
416 unsigned short *buf;
417 unsigned int count;
418
419 if (host->dma_on) {
420 pr_err("PIO IRQ in DMA mode!\n");
421 return;
422 } else if (!data) {
423 pr_debug("Spurious PIO IRQ\n");
424 return;
425 }
426
427 sg_virt = kmap_local_page(sg_page(host->sg_ptr));
428 buf = (unsigned short *)(sg_virt + host->sg_ptr->offset + host->sg_off);
429
430 count = host->sg_ptr->length - host->sg_off;
431 if (count > data->blksz)
432 count = data->blksz;
433
434 pr_debug("count: %08x offset: %08x flags %08x\n",
435 count, host->sg_off, data->flags);
436
437 /* Transfer the data */
438 tmio_mmc_transfer_data(host, buf, count);
439
440 host->sg_off += count;
441
442 kunmap_local(sg_virt);
443
444 if (host->sg_off == host->sg_ptr->length)
445 tmio_mmc_next_sg(host);
446 }
447
448 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
449 {
450 if (host->sg_ptr == &host->bounce_sg) {
451 void *sg_virt = kmap_local_page(sg_page(host->sg_orig));
452
453 memcpy(sg_virt + host->sg_orig->offset, host->bounce_buf,
454 host->bounce_sg.length);
455 kunmap_local(sg_virt);
456 }
457 }
458
459 /* needs to be called with host->lock held */
460 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
461 {
462 struct mmc_data *data = host->data;
463 struct mmc_command *stop;
464
465 host->data = NULL;
466
467 if (!data) {
468 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
469 return;
470 }
471 stop = data->stop;
472
473 /* FIXME - return correct transfer count on errors */
474 if (!data->error)
475 data->bytes_xfered = data->blocks * data->blksz;
476 else
477 data->bytes_xfered = 0;
478
479 pr_debug("Completed data request\n");
480
481 /*
482 * FIXME: other drivers allow an optional stop command of any given type
483 * which we dont do, as the chip can auto generate them.
484 * Perhaps we can be smarter about when to use auto CMD12 and
485 * only issue the auto request when we know this is the desired
486 * stop command, allowing fallback to the stop command the
487 * upper layers expect. For now, we do what works.
488 */
489
490 if (data->flags & MMC_DATA_READ) {
491 if (host->dma_on)
492 tmio_mmc_check_bounce_buffer(host);
493 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
494 host->mrq);
495 } else {
496 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
497 host->mrq);
498 }
499
500 if (stop && !host->mrq->sbc) {
501 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg)
502 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n",
503 stop->opcode, stop->arg);
504
505 /* fill in response from auto CMD12 */
506 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE);
507
508 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0);
509 }
510
511 schedule_work(&host->done);
512 }
513 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq);
514
515 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat)
516 {
517 struct mmc_data *data;
518
519 spin_lock(&host->lock);
520 data = host->data;
521
522 if (!data)
523 goto out;
524
525 if (stat & TMIO_STAT_DATATIMEOUT)
526 data->error = -ETIMEDOUT;
527 else if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR ||
528 stat & TMIO_STAT_TXUNDERRUN)
529 data->error = -EILSEQ;
530 if (host->dma_on && (data->flags & MMC_DATA_WRITE)) {
531 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
532 bool done = false;
533
534 /*
535 * Has all data been written out yet? Testing on SuperH showed,
536 * that in most cases the first interrupt comes already with the
537 * BUSY status bit clear, but on some operations, like mount or
538 * in the beginning of a write / sync / umount, there is one
539 * DATAEND interrupt with the BUSY bit set, in this cases
540 * waiting for one more interrupt fixes the problem.
541 */
542 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) {
543 if (status & TMIO_STAT_SCLKDIVEN)
544 done = true;
545 } else {
546 if (!(status & TMIO_STAT_CMD_BUSY))
547 done = true;
548 }
549
550 if (done) {
551 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
552 tmio_mmc_dataend_dma(host);
553 }
554 } else if (host->dma_on && (data->flags & MMC_DATA_READ)) {
555 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
556 tmio_mmc_dataend_dma(host);
557 } else {
558 tmio_mmc_do_data_irq(host);
559 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
560 }
561 out:
562 spin_unlock(&host->lock);
563 }
564
565 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
566 {
567 struct mmc_command *cmd = host->cmd;
568 int i, addr;
569
570 spin_lock(&host->lock);
571
572 if (!host->cmd) {
573 pr_debug("Spurious CMD irq\n");
574 goto out;
575 }
576
577 /* This controller is sicker than the PXA one. Not only do we need to
578 * drop the top 8 bits of the first response word, we also need to
579 * modify the order of the response for short response command types.
580 */
581
582 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
583 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr);
584
585 if (cmd->flags & MMC_RSP_136) {
586 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
587 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
588 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
589 cmd->resp[3] <<= 8;
590 } else if (cmd->flags & MMC_RSP_R3) {
591 cmd->resp[0] = cmd->resp[3];
592 }
593
594 if (stat & TMIO_STAT_CMDTIMEOUT)
595 cmd->error = -ETIMEDOUT;
596 else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) ||
597 stat & TMIO_STAT_STOPBIT_ERR ||
598 stat & TMIO_STAT_CMD_IDX_ERR)
599 cmd->error = -EILSEQ;
600
601 /* If there is data to handle we enable data IRQs here, and
602 * we will ultimatley finish the request in the data_end handler.
603 * If theres no data or we encountered an error, finish now.
604 */
605 if (host->data && (!cmd->error || cmd->error == -EILSEQ)) {
606 if (host->data->flags & MMC_DATA_READ) {
607 if (!host->dma_on) {
608 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
609 } else {
610 tmio_mmc_disable_mmc_irqs(host,
611 TMIO_MASK_READOP);
612 queue_work(system_bh_wq, &host->dma_issue);
613 }
614 } else {
615 if (!host->dma_on) {
616 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
617 } else {
618 tmio_mmc_disable_mmc_irqs(host,
619 TMIO_MASK_WRITEOP);
620 queue_work(system_bh_wq, &host->dma_issue);
621 }
622 }
623 } else {
624 schedule_work(&host->done);
625 }
626
627 out:
628 spin_unlock(&host->lock);
629 }
630
631 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
632 int ireg, int status)
633 {
634 struct mmc_host *mmc = host->mmc;
635
636 /* Card insert / remove attempts */
637 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
638 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
639 TMIO_STAT_CARD_REMOVE);
640 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
641 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
642 !work_pending(&mmc->detect.work))
643 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
644 return true;
645 }
646
647 return false;
648 }
649
650 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg,
651 int status)
652 {
653 /* Command completion */
654 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
655 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND |
656 TMIO_STAT_CMDTIMEOUT);
657 tmio_mmc_cmd_irq(host, status);
658 return true;
659 }
660
661 /* Data transfer */
662 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
663 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
664 tmio_mmc_pio_irq(host);
665 return true;
666 }
667
668 /* Data transfer completion */
669 if (ireg & TMIO_STAT_DATAEND) {
670 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
671 tmio_mmc_data_irq(host, status);
672 return true;
673 }
674
675 if (host->dma_ops && host->dma_ops->dma_irq && host->dma_ops->dma_irq(host))
676 return true;
677
678 return false;
679 }
680
681 static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
682 {
683 struct mmc_host *mmc = host->mmc;
684 struct tmio_mmc_data *pdata = host->pdata;
685 unsigned int ireg, status;
686 unsigned int sdio_status;
687
688 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
689 return false;
690
691 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
692 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask;
693
694 sdio_status = status & ~TMIO_SDIO_MASK_ALL;
695 if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
696 sdio_status |= TMIO_SDIO_SETBITS_MASK;
697
698 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
699
700 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
701 mmc_signal_sdio_irq(mmc);
702
703 return ireg;
704 }
705
706 irqreturn_t tmio_mmc_irq(int irq, void *devid)
707 {
708 struct tmio_mmc_host *host = devid;
709 unsigned int ireg, status;
710
711 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
712 ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
713
714 /* Clear the status except the interrupt status */
715 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ);
716
717 if (__tmio_mmc_card_detect_irq(host, ireg, status))
718 return IRQ_HANDLED;
719 if (__tmio_mmc_sdcard_irq(host, ireg, status))
720 return IRQ_HANDLED;
721
722 if (__tmio_mmc_sdio_irq(host))
723 return IRQ_HANDLED;
724
725 return IRQ_NONE;
726 }
727 EXPORT_SYMBOL_GPL(tmio_mmc_irq);
728
729 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
730 struct mmc_data *data)
731 {
732 struct tmio_mmc_data *pdata = host->pdata;
733
734 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
735 data->blksz, data->blocks);
736
737 /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */
738 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 ||
739 host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
740 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
741
742 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
743 pr_err("%s: %d byte block unsupported in 4/8 bit mode\n",
744 mmc_hostname(host->mmc), data->blksz);
745 return -EINVAL;
746 }
747 }
748
749 tmio_mmc_init_sg(host, data);
750 host->data = data;
751 host->dma_on = false;
752
753 /* Set transfer length / blocksize */
754 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
755 if (host->mmc->max_blk_count >= SZ_64K)
756 sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks);
757 else
758 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
759
760 tmio_mmc_start_dma(host, data);
761
762 return 0;
763 }
764
765 static void tmio_process_mrq(struct tmio_mmc_host *host,
766 struct mmc_request *mrq)
767 {
768 struct mmc_command *cmd;
769 int ret;
770
771 if (mrq->sbc && host->cmd != mrq->sbc) {
772 cmd = mrq->sbc;
773 } else {
774 cmd = mrq->cmd;
775 if (mrq->data) {
776 ret = tmio_mmc_start_data(host, mrq->data);
777 if (ret)
778 goto fail;
779 }
780 }
781
782 ret = tmio_mmc_start_command(host, cmd);
783 if (ret)
784 goto fail;
785
786 schedule_delayed_work(&host->delayed_reset_work,
787 msecs_to_jiffies(CMDREQ_TIMEOUT));
788 return;
789
790 fail:
791 host->mrq = NULL;
792 mrq->cmd->error = ret;
793 mmc_request_done(host->mmc, mrq);
794 }
795
796 /* Process requests from the MMC layer */
797 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
798 {
799 struct tmio_mmc_host *host = mmc_priv(mmc);
800 unsigned long flags;
801
802 spin_lock_irqsave(&host->lock, flags);
803
804 if (host->mrq) {
805 pr_debug("request not null\n");
806 if (IS_ERR(host->mrq)) {
807 spin_unlock_irqrestore(&host->lock, flags);
808 mrq->cmd->error = -EAGAIN;
809 mmc_request_done(mmc, mrq);
810 return;
811 }
812 }
813
814 host->last_req_ts = jiffies;
815 wmb();
816 host->mrq = mrq;
817
818 spin_unlock_irqrestore(&host->lock, flags);
819
820 tmio_process_mrq(host, mrq);
821 }
822
823 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
824 {
825 struct mmc_request *mrq;
826 unsigned long flags;
827
828 spin_lock_irqsave(&host->lock, flags);
829
830 tmio_mmc_end_dma(host);
831
832 mrq = host->mrq;
833 if (IS_ERR_OR_NULL(mrq)) {
834 spin_unlock_irqrestore(&host->lock, flags);
835 return;
836 }
837
838 /* If not SET_BLOCK_COUNT, clear old data */
839 if (host->cmd != mrq->sbc) {
840 host->cmd = NULL;
841 host->data = NULL;
842 host->mrq = NULL;
843 }
844
845 cancel_delayed_work(&host->delayed_reset_work);
846
847 spin_unlock_irqrestore(&host->lock, flags);
848
849 if (mrq->cmd->error || (mrq->data && mrq->data->error)) {
850 tmio_mmc_ack_mmc_irqs(host, TMIO_MASK_IRQ); /* Clear all */
851 tmio_mmc_abort_dma(host);
852 }
853
854 /* Error means retune, but executed command was still successful */
855 if (host->check_retune && host->check_retune(host, mrq))
856 mmc_retune_needed(host->mmc);
857
858 /* If SET_BLOCK_COUNT, continue with main command */
859 if (host->mrq && !mrq->cmd->error) {
860 tmio_process_mrq(host, mrq);
861 return;
862 }
863
864 if (host->fixup_request)
865 host->fixup_request(host, mrq);
866
867 mmc_request_done(host->mmc, mrq);
868 }
869
870 static void tmio_mmc_done_work(struct work_struct *work)
871 {
872 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
873 done);
874 tmio_mmc_finish_request(host);
875 }
876
877 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
878 {
879 struct mmc_host *mmc = host->mmc;
880 int ret = 0;
881
882 /* .set_ios() is returning void, so, no chance to report an error */
883
884 if (!IS_ERR(mmc->supply.vmmc)) {
885 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
886 /*
887 * Attention: empiric value. With a b43 WiFi SDIO card this
888 * delay proved necessary for reliable card-insertion probing.
889 * 100us were not enough. Is this the same 140us delay, as in
890 * tmio_mmc_set_ios()?
891 */
892 usleep_range(200, 300);
893 }
894 /*
895 * It seems, VccQ should be switched on after Vcc, this is also what the
896 * omap_hsmmc.c driver does.
897 */
898 if (!ret) {
899 ret = mmc_regulator_enable_vqmmc(mmc);
900 usleep_range(200, 300);
901 }
902
903 if (ret < 0)
904 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
905 ret);
906 }
907
908 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
909 {
910 struct mmc_host *mmc = host->mmc;
911
912 mmc_regulator_disable_vqmmc(mmc);
913
914 if (!IS_ERR(mmc->supply.vmmc))
915 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
916 }
917
918 static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host)
919 {
920 u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
921
922 val = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT;
923 return 1 << (13 + val);
924 }
925
926 static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host)
927 {
928 unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max;
929
930 host->mmc->max_busy_timeout = host->get_timeout_cycles(host) /
931 (clk_rate / MSEC_PER_SEC);
932 }
933
934 /* Set MMC clock / power.
935 * Note: This controller uses a simple divider scheme therefore it cannot
936 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
937 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
938 * slowest setting.
939 */
940 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
941 {
942 struct tmio_mmc_host *host = mmc_priv(mmc);
943 struct device *dev = &host->pdev->dev;
944 unsigned long flags;
945
946 mutex_lock(&host->ios_lock);
947
948 spin_lock_irqsave(&host->lock, flags);
949 if (host->mrq) {
950 if (IS_ERR(host->mrq)) {
951 dev_dbg(dev,
952 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
953 current->comm, task_pid_nr(current),
954 ios->clock, ios->power_mode);
955 host->mrq = ERR_PTR(-EINTR);
956 } else {
957 dev_dbg(dev,
958 "%s.%d: CMD%u active since %lu, now %lu!\n",
959 current->comm, task_pid_nr(current),
960 host->mrq->cmd->opcode, host->last_req_ts,
961 jiffies);
962 }
963 spin_unlock_irqrestore(&host->lock, flags);
964
965 mutex_unlock(&host->ios_lock);
966 return;
967 }
968
969 /* Disallow new mrqs and work handlers to run */
970 host->mrq = ERR_PTR(-EBUSY);
971
972 spin_unlock_irqrestore(&host->lock, flags);
973
974 switch (ios->power_mode) {
975 case MMC_POWER_OFF:
976 tmio_mmc_power_off(host);
977 /* For R-Car Gen2+, we need to reset SDHI specific SCC */
978 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2)
979 tmio_mmc_reset(host, false);
980
981 host->set_clock(host, 0);
982 break;
983 case MMC_POWER_UP:
984 tmio_mmc_power_on(host, ios->vdd);
985 host->set_clock(host, ios->clock);
986 tmio_mmc_set_bus_width(host, ios->bus_width);
987 break;
988 case MMC_POWER_ON:
989 host->set_clock(host, ios->clock);
990 tmio_mmc_set_bus_width(host, ios->bus_width);
991 break;
992 }
993
994 if (host->pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT)
995 tmio_mmc_max_busy_timeout(host);
996
997 /* Let things settle. delay taken from winCE driver */
998 usleep_range(140, 200);
999 if (PTR_ERR(host->mrq) == -EINTR)
1000 dev_dbg(&host->pdev->dev,
1001 "%s.%d: IOS interrupted: clk %u, mode %u",
1002 current->comm, task_pid_nr(current),
1003 ios->clock, ios->power_mode);
1004
1005 /* Ready for new mrqs */
1006 host->mrq = NULL;
1007 host->clk_cache = ios->clock;
1008
1009 mutex_unlock(&host->ios_lock);
1010 }
1011
1012 static int tmio_mmc_get_ro(struct mmc_host *mmc)
1013 {
1014 struct tmio_mmc_host *host = mmc_priv(mmc);
1015
1016 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
1017 TMIO_STAT_WRPROTECT);
1018 }
1019
1020 static int tmio_mmc_get_cd(struct mmc_host *mmc)
1021 {
1022 struct tmio_mmc_host *host = mmc_priv(mmc);
1023
1024 return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
1025 TMIO_STAT_SIGSTATE);
1026 }
1027
1028 static int tmio_multi_io_quirk(struct mmc_card *card,
1029 unsigned int direction, int blk_size)
1030 {
1031 struct tmio_mmc_host *host = mmc_priv(card->host);
1032
1033 if (host->multi_io_quirk)
1034 return host->multi_io_quirk(card, direction, blk_size);
1035
1036 return blk_size;
1037 }
1038
1039 static struct mmc_host_ops tmio_mmc_ops = {
1040 .request = tmio_mmc_request,
1041 .set_ios = tmio_mmc_set_ios,
1042 .get_ro = tmio_mmc_get_ro,
1043 .get_cd = tmio_mmc_get_cd,
1044 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
1045 .multi_io_quirk = tmio_multi_io_quirk,
1046 };
1047
1048 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
1049 {
1050 struct tmio_mmc_data *pdata = host->pdata;
1051 struct mmc_host *mmc = host->mmc;
1052 int err;
1053
1054 err = mmc_regulator_get_supply(mmc);
1055 if (err)
1056 return err;
1057
1058 /* use ocr_mask if no regulator */
1059 if (!mmc->ocr_avail)
1060 mmc->ocr_avail = pdata->ocr_mask;
1061
1062 /*
1063 * try again.
1064 * There is possibility that regulator has not been probed
1065 */
1066 if (!mmc->ocr_avail)
1067 return -EPROBE_DEFER;
1068
1069 return 0;
1070 }
1071
1072 static void tmio_mmc_of_parse(struct platform_device *pdev,
1073 struct mmc_host *mmc)
1074 {
1075 const struct device_node *np = pdev->dev.of_node;
1076
1077 if (!np)
1078 return;
1079
1080 /*
1081 * DEPRECATED:
1082 * For new platforms, please use "disable-wp" instead of
1083 * "toshiba,mmc-wrprotect-disable"
1084 */
1085 if (of_property_read_bool(np, "toshiba,mmc-wrprotect-disable"))
1086 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
1087 }
1088
1089 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
1090 struct tmio_mmc_data *pdata)
1091 {
1092 struct tmio_mmc_host *host;
1093 struct mmc_host *mmc;
1094 void __iomem *ctl;
1095 int ret;
1096
1097 ctl = devm_platform_ioremap_resource(pdev, 0);
1098 if (IS_ERR(ctl))
1099 return ERR_CAST(ctl);
1100
1101 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
1102 if (!mmc)
1103 return ERR_PTR(-ENOMEM);
1104
1105 host = mmc_priv(mmc);
1106 host->ctl = ctl;
1107 host->mmc = mmc;
1108 host->pdev = pdev;
1109 host->pdata = pdata;
1110 host->ops = tmio_mmc_ops;
1111 mmc->ops = &host->ops;
1112
1113 ret = mmc_of_parse(host->mmc);
1114 if (ret) {
1115 host = ERR_PTR(ret);
1116 goto free;
1117 }
1118
1119 tmio_mmc_of_parse(pdev, mmc);
1120
1121 platform_set_drvdata(pdev, host);
1122
1123 return host;
1124 free:
1125 mmc_free_host(mmc);
1126
1127 return host;
1128 }
1129 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc);
1130
1131 void tmio_mmc_host_free(struct tmio_mmc_host *host)
1132 {
1133 mmc_free_host(host->mmc);
1134 }
1135 EXPORT_SYMBOL_GPL(tmio_mmc_host_free);
1136
1137 int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
1138 {
1139 struct platform_device *pdev = _host->pdev;
1140 struct tmio_mmc_data *pdata = _host->pdata;
1141 struct mmc_host *mmc = _host->mmc;
1142 int ret;
1143
1144 /*
1145 * Check the sanity of mmc->f_min to prevent host->set_clock() from
1146 * looping forever...
1147 */
1148 if (mmc->f_min == 0)
1149 return -EINVAL;
1150
1151 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
1152 _host->write16_hook = NULL;
1153
1154 if (pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT && !_host->get_timeout_cycles)
1155 _host->get_timeout_cycles = tmio_mmc_get_timeout_cycles;
1156
1157 ret = tmio_mmc_init_ocr(_host);
1158 if (ret < 0)
1159 return ret;
1160
1161 /*
1162 * Look for a card detect GPIO, if it fails with anything
1163 * else than a probe deferral, just live without it.
1164 */
1165 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
1166 if (ret == -EPROBE_DEFER)
1167 return ret;
1168
1169 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1170 mmc->caps2 |= pdata->capabilities2;
1171 mmc->max_segs = pdata->max_segs ? : 32;
1172 mmc->max_blk_size = TMIO_MAX_BLK_SIZE;
1173 mmc->max_blk_count = pdata->max_blk_count ? :
1174 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs;
1175 mmc->max_req_size = min_t(size_t,
1176 mmc->max_blk_size * mmc->max_blk_count,
1177 dma_max_mapping_size(&pdev->dev));
1178 mmc->max_seg_size = mmc->max_req_size;
1179
1180 if (mmc_can_gpio_ro(mmc))
1181 _host->ops.get_ro = mmc_gpio_get_ro;
1182
1183 if (mmc_can_gpio_cd(mmc))
1184 _host->ops.get_cd = mmc_gpio_get_cd;
1185
1186 /* must be set before tmio_mmc_reset() */
1187 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) ||
1188 mmc->caps & MMC_CAP_NEEDS_POLL ||
1189 !mmc_card_is_removable(mmc));
1190
1191 /*
1192 * While using internal tmio hardware logic for card detection, we need
1193 * to ensure it stays powered for it to work.
1194 */
1195 if (_host->native_hotplug)
1196 pm_runtime_get_noresume(&pdev->dev);
1197
1198 _host->sdio_irq_enabled = false;
1199 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1200 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
1201
1202 if (!_host->sdcard_irq_mask_all)
1203 _host->sdcard_irq_mask_all = TMIO_MASK_ALL;
1204
1205 _host->set_clock(_host, 0);
1206 tmio_mmc_reset(_host, false);
1207
1208 spin_lock_init(&_host->lock);
1209 mutex_init(&_host->ios_lock);
1210
1211 /* Init delayed work for request timeouts */
1212 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1213 INIT_WORK(&_host->done, tmio_mmc_done_work);
1214
1215 /* See if we also get DMA */
1216 tmio_mmc_request_dma(_host, pdata);
1217
1218 pm_runtime_get_noresume(&pdev->dev);
1219 pm_runtime_set_active(&pdev->dev);
1220 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1221 pm_runtime_use_autosuspend(&pdev->dev);
1222 pm_runtime_enable(&pdev->dev);
1223
1224 ret = mmc_add_host(mmc);
1225 if (ret)
1226 goto remove_host;
1227
1228 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1229 pm_runtime_put(&pdev->dev);
1230
1231 return 0;
1232
1233 remove_host:
1234 pm_runtime_put_noidle(&pdev->dev);
1235 tmio_mmc_host_remove(_host);
1236 return ret;
1237 }
1238 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe);
1239
1240 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1241 {
1242 struct platform_device *pdev = host->pdev;
1243 struct mmc_host *mmc = host->mmc;
1244
1245 pm_runtime_get_sync(&pdev->dev);
1246
1247 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ)
1248 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
1249
1250 dev_pm_qos_hide_latency_limit(&pdev->dev);
1251
1252 mmc_remove_host(mmc);
1253 cancel_work_sync(&host->done);
1254 cancel_delayed_work_sync(&host->delayed_reset_work);
1255 tmio_mmc_release_dma(host);
1256 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all);
1257
1258 if (host->native_hotplug)
1259 pm_runtime_put_noidle(&pdev->dev);
1260
1261 pm_runtime_disable(&pdev->dev);
1262 pm_runtime_dont_use_autosuspend(&pdev->dev);
1263 pm_runtime_put_noidle(&pdev->dev);
1264 }
1265 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove);
1266
1267 #ifdef CONFIG_PM
1268 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host)
1269 {
1270 if (!host->clk_enable)
1271 return -ENOTSUPP;
1272
1273 return host->clk_enable(host);
1274 }
1275
1276 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host)
1277 {
1278 if (host->clk_disable)
1279 host->clk_disable(host);
1280 }
1281
1282 int tmio_mmc_host_runtime_suspend(struct device *dev)
1283 {
1284 struct tmio_mmc_host *host = dev_get_drvdata(dev);
1285
1286 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all);
1287
1288 if (host->clk_cache)
1289 host->set_clock(host, 0);
1290
1291 tmio_mmc_clk_disable(host);
1292
1293 return 0;
1294 }
1295 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend);
1296
1297 int tmio_mmc_host_runtime_resume(struct device *dev)
1298 {
1299 struct tmio_mmc_host *host = dev_get_drvdata(dev);
1300
1301 tmio_mmc_clk_enable(host);
1302 tmio_mmc_reset(host, false);
1303
1304 if (host->clk_cache)
1305 host->set_clock(host, host->clk_cache);
1306
1307 tmio_mmc_enable_dma(host, true);
1308
1309 return 0;
1310 }
1311 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume);
1312 #endif
1313
1314 MODULE_DESCRIPTION("TMIO MMC core driver");
1315 MODULE_LICENSE("GPL v2");
Kernel DRM miscellaneous fixes and cross-tree changes