Loading...
Note: File does not exist in v3.15.
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/mfd/tmio.h>
35#include <linux/mmc/card.h>
36#include <linux/mmc/host.h>
37#include <linux/mmc/mmc.h>
38#include <linux/mmc/slot-gpio.h>
39#include <linux/module.h>
40#include <linux/pagemap.h>
41#include <linux/platform_device.h>
42#include <linux/pm_qos.h>
43#include <linux/pm_runtime.h>
44#include <linux/regulator/consumer.h>
45#include <linux/mmc/sdio.h>
46#include <linux/scatterlist.h>
47#include <linux/sizes.h>
48#include <linux/spinlock.h>
49#include <linux/workqueue.h>
50
51#include "tmio_mmc.h"
52
53static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
54 struct mmc_data *data)
55{
56 if (host->dma_ops)
57 host->dma_ops->start(host, data);
58}
59
60static inline void tmio_mmc_end_dma(struct tmio_mmc_host *host)
61{
62 if (host->dma_ops && host->dma_ops->end)
63 host->dma_ops->end(host);
64}
65
66static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
67{
68 if (host->dma_ops)
69 host->dma_ops->enable(host, enable);
70}
71
72static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
73 struct tmio_mmc_data *pdata)
74{
75 if (host->dma_ops) {
76 host->dma_ops->request(host, pdata);
77 } else {
78 host->chan_tx = NULL;
79 host->chan_rx = NULL;
80 }
81}
82
83static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
84{
85 if (host->dma_ops)
86 host->dma_ops->release(host);
87}
88
89static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
90{
91 if (host->dma_ops)
92 host->dma_ops->abort(host);
93}
94
95static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host)
96{
97 if (host->dma_ops)
98 host->dma_ops->dataend(host);
99}
100
101void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
102{
103 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
104 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
105}
106EXPORT_SYMBOL_GPL(tmio_mmc_enable_mmc_irqs);
107
108void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
109{
110 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
111 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
112}
113EXPORT_SYMBOL_GPL(tmio_mmc_disable_mmc_irqs);
114
115static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
116{
117 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i);
118}
119
120static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
121{
122 host->sg_len = data->sg_len;
123 host->sg_ptr = data->sg;
124 host->sg_orig = data->sg;
125 host->sg_off = 0;
126}
127
128static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
129{
130 host->sg_ptr = sg_next(host->sg_ptr);
131 host->sg_off = 0;
132 return --host->sg_len;
133}
134
135#define CMDREQ_TIMEOUT 5000
136
137static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
138{
139 struct tmio_mmc_host *host = mmc_priv(mmc);
140
141 if (enable && !host->sdio_irq_enabled) {
142 u16 sdio_status;
143
144 /* Keep device active while SDIO irq is enabled */
145 pm_runtime_get_sync(mmc_dev(mmc));
146
147 host->sdio_irq_enabled = true;
148 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ;
149
150 /* Clear obsolete interrupts before enabling */
151 sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS) & ~TMIO_SDIO_MASK_ALL;
152 if (host->pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
153 sdio_status |= TMIO_SDIO_SETBITS_MASK;
154 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
155
156 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
157 } else if (!enable && host->sdio_irq_enabled) {
158 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
159 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
160
161 host->sdio_irq_enabled = false;
162 pm_runtime_mark_last_busy(mmc_dev(mmc));
163 pm_runtime_put_autosuspend(mmc_dev(mmc));
164 }
165}
166
167static void tmio_mmc_reset(struct tmio_mmc_host *host)
168{
169 /* FIXME - should we set stop clock reg here */
170 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
171 usleep_range(10000, 11000);
172 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
173 usleep_range(10000, 11000);
174
175 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
176 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
177 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
178 }
179}
180
181static void tmio_mmc_hw_reset(struct mmc_host *mmc)
182{
183 struct tmio_mmc_host *host = mmc_priv(mmc);
184
185 host->reset(host);
186
187 tmio_mmc_abort_dma(host);
188
189 if (host->hw_reset)
190 host->hw_reset(host);
191}
192
193static void tmio_mmc_reset_work(struct work_struct *work)
194{
195 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
196 delayed_reset_work.work);
197 struct mmc_request *mrq;
198 unsigned long flags;
199
200 spin_lock_irqsave(&host->lock, flags);
201 mrq = host->mrq;
202
203 /*
204 * is request already finished? Since we use a non-blocking
205 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
206 * us, so, have to check for IS_ERR(host->mrq)
207 */
208 if (IS_ERR_OR_NULL(mrq) ||
209 time_is_after_jiffies(host->last_req_ts +
210 msecs_to_jiffies(CMDREQ_TIMEOUT))) {
211 spin_unlock_irqrestore(&host->lock, flags);
212 return;
213 }
214
215 dev_warn(&host->pdev->dev,
216 "timeout waiting for hardware interrupt (CMD%u)\n",
217 mrq->cmd->opcode);
218
219 if (host->data)
220 host->data->error = -ETIMEDOUT;
221 else if (host->cmd)
222 host->cmd->error = -ETIMEDOUT;
223 else
224 mrq->cmd->error = -ETIMEDOUT;
225
226 host->cmd = NULL;
227 host->data = NULL;
228
229 spin_unlock_irqrestore(&host->lock, flags);
230
231 tmio_mmc_hw_reset(host->mmc);
232
233 /* Ready for new calls */
234 host->mrq = NULL;
235
236 mmc_request_done(host->mmc, mrq);
237}
238
239/* These are the bitmasks the tmio chip requires to implement the MMC response
240 * types. Note that R1 and R6 are the same in this scheme. */
241#define APP_CMD 0x0040
242#define RESP_NONE 0x0300
243#define RESP_R1 0x0400
244#define RESP_R1B 0x0500
245#define RESP_R2 0x0600
246#define RESP_R3 0x0700
247#define DATA_PRESENT 0x0800
248#define TRANSFER_READ 0x1000
249#define TRANSFER_MULTI 0x2000
250#define SECURITY_CMD 0x4000
251#define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */
252
253static int tmio_mmc_start_command(struct tmio_mmc_host *host,
254 struct mmc_command *cmd)
255{
256 struct mmc_data *data = host->data;
257 int c = cmd->opcode;
258
259 switch (mmc_resp_type(cmd)) {
260 case MMC_RSP_NONE: c |= RESP_NONE; break;
261 case MMC_RSP_R1:
262 case MMC_RSP_R1_NO_CRC:
263 c |= RESP_R1; break;
264 case MMC_RSP_R1B: c |= RESP_R1B; break;
265 case MMC_RSP_R2: c |= RESP_R2; break;
266 case MMC_RSP_R3: c |= RESP_R3; break;
267 default:
268 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
269 return -EINVAL;
270 }
271
272 host->cmd = cmd;
273
274/* FIXME - this seems to be ok commented out but the spec suggest this bit
275 * should be set when issuing app commands.
276 * if(cmd->flags & MMC_FLAG_ACMD)
277 * c |= APP_CMD;
278 */
279 if (data) {
280 c |= DATA_PRESENT;
281 if (data->blocks > 1) {
282 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC);
283 c |= TRANSFER_MULTI;
284
285 /*
286 * Disable auto CMD12 at IO_RW_EXTENDED and
287 * SET_BLOCK_COUNT when doing multiple block transfer
288 */
289 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) &&
290 (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc))
291 c |= NO_CMD12_ISSUE;
292 }
293 if (data->flags & MMC_DATA_READ)
294 c |= TRANSFER_READ;
295 }
296
297 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD);
298
299 /* Fire off the command */
300 sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg);
301 sd_ctrl_write16(host, CTL_SD_CMD, c);
302
303 return 0;
304}
305
306static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
307 unsigned short *buf,
308 unsigned int count)
309{
310 int is_read = host->data->flags & MMC_DATA_READ;
311 u8 *buf8;
312
313 /*
314 * Transfer the data
315 */
316 if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) {
317 u32 data = 0;
318 u32 *buf32 = (u32 *)buf;
319
320 if (is_read)
321 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32,
322 count >> 2);
323 else
324 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32,
325 count >> 2);
326
327 /* if count was multiple of 4 */
328 if (!(count & 0x3))
329 return;
330
331 buf32 += count >> 2;
332 count %= 4;
333
334 if (is_read) {
335 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1);
336 memcpy(buf32, &data, count);
337 } else {
338 memcpy(&data, buf32, count);
339 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1);
340 }
341
342 return;
343 }
344
345 if (is_read)
346 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
347 else
348 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
349
350 /* if count was even number */
351 if (!(count & 0x1))
352 return;
353
354 /* if count was odd number */
355 buf8 = (u8 *)(buf + (count >> 1));
356
357 /*
358 * FIXME
359 *
360 * driver and this function are assuming that
361 * it is used as little endian
362 */
363 if (is_read)
364 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
365 else
366 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
367}
368
369/*
370 * This chip always returns (at least?) as much data as you ask for.
371 * I'm unsure what happens if you ask for less than a block. This should be
372 * looked into to ensure that a funny length read doesn't hose the controller.
373 */
374static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
375{
376 struct mmc_data *data = host->data;
377 void *sg_virt;
378 unsigned short *buf;
379 unsigned int count;
380 unsigned long flags;
381
382 if (host->dma_on) {
383 pr_err("PIO IRQ in DMA mode!\n");
384 return;
385 } else if (!data) {
386 pr_debug("Spurious PIO IRQ\n");
387 return;
388 }
389
390 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
391 buf = (unsigned short *)(sg_virt + host->sg_off);
392
393 count = host->sg_ptr->length - host->sg_off;
394 if (count > data->blksz)
395 count = data->blksz;
396
397 pr_debug("count: %08x offset: %08x flags %08x\n",
398 count, host->sg_off, data->flags);
399
400 /* Transfer the data */
401 tmio_mmc_transfer_data(host, buf, count);
402
403 host->sg_off += count;
404
405 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
406
407 if (host->sg_off == host->sg_ptr->length)
408 tmio_mmc_next_sg(host);
409}
410
411static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
412{
413 if (host->sg_ptr == &host->bounce_sg) {
414 unsigned long flags;
415 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
416
417 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
418 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
419 }
420}
421
422/* needs to be called with host->lock held */
423void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
424{
425 struct mmc_data *data = host->data;
426 struct mmc_command *stop;
427
428 host->data = NULL;
429
430 if (!data) {
431 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
432 return;
433 }
434 stop = data->stop;
435
436 /* FIXME - return correct transfer count on errors */
437 if (!data->error)
438 data->bytes_xfered = data->blocks * data->blksz;
439 else
440 data->bytes_xfered = 0;
441
442 pr_debug("Completed data request\n");
443
444 /*
445 * FIXME: other drivers allow an optional stop command of any given type
446 * which we dont do, as the chip can auto generate them.
447 * Perhaps we can be smarter about when to use auto CMD12 and
448 * only issue the auto request when we know this is the desired
449 * stop command, allowing fallback to the stop command the
450 * upper layers expect. For now, we do what works.
451 */
452
453 if (data->flags & MMC_DATA_READ) {
454 if (host->dma_on)
455 tmio_mmc_check_bounce_buffer(host);
456 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
457 host->mrq);
458 } else {
459 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
460 host->mrq);
461 }
462
463 if (stop && !host->mrq->sbc) {
464 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg)
465 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n",
466 stop->opcode, stop->arg);
467
468 /* fill in response from auto CMD12 */
469 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE);
470
471 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0);
472 }
473
474 schedule_work(&host->done);
475}
476EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq);
477
478static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat)
479{
480 struct mmc_data *data;
481
482 spin_lock(&host->lock);
483 data = host->data;
484
485 if (!data)
486 goto out;
487
488 if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR ||
489 stat & TMIO_STAT_TXUNDERRUN)
490 data->error = -EILSEQ;
491 if (host->dma_on && (data->flags & MMC_DATA_WRITE)) {
492 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
493 bool done = false;
494
495 /*
496 * Has all data been written out yet? Testing on SuperH showed,
497 * that in most cases the first interrupt comes already with the
498 * BUSY status bit clear, but on some operations, like mount or
499 * in the beginning of a write / sync / umount, there is one
500 * DATAEND interrupt with the BUSY bit set, in this cases
501 * waiting for one more interrupt fixes the problem.
502 */
503 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) {
504 if (status & TMIO_STAT_SCLKDIVEN)
505 done = true;
506 } else {
507 if (!(status & TMIO_STAT_CMD_BUSY))
508 done = true;
509 }
510
511 if (done) {
512 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
513 tmio_mmc_dataend_dma(host);
514 }
515 } else if (host->dma_on && (data->flags & MMC_DATA_READ)) {
516 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
517 tmio_mmc_dataend_dma(host);
518 } else {
519 tmio_mmc_do_data_irq(host);
520 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
521 }
522out:
523 spin_unlock(&host->lock);
524}
525
526static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
527{
528 struct mmc_command *cmd = host->cmd;
529 int i, addr;
530
531 spin_lock(&host->lock);
532
533 if (!host->cmd) {
534 pr_debug("Spurious CMD irq\n");
535 goto out;
536 }
537
538 /* This controller is sicker than the PXA one. Not only do we need to
539 * drop the top 8 bits of the first response word, we also need to
540 * modify the order of the response for short response command types.
541 */
542
543 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
544 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr);
545
546 if (cmd->flags & MMC_RSP_136) {
547 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
548 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
549 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
550 cmd->resp[3] <<= 8;
551 } else if (cmd->flags & MMC_RSP_R3) {
552 cmd->resp[0] = cmd->resp[3];
553 }
554
555 if (stat & TMIO_STAT_CMDTIMEOUT)
556 cmd->error = -ETIMEDOUT;
557 else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) ||
558 stat & TMIO_STAT_STOPBIT_ERR ||
559 stat & TMIO_STAT_CMD_IDX_ERR)
560 cmd->error = -EILSEQ;
561
562 /* If there is data to handle we enable data IRQs here, and
563 * we will ultimatley finish the request in the data_end handler.
564 * If theres no data or we encountered an error, finish now.
565 */
566 if (host->data && (!cmd->error || cmd->error == -EILSEQ)) {
567 if (host->data->flags & MMC_DATA_READ) {
568 if (!host->dma_on) {
569 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
570 } else {
571 tmio_mmc_disable_mmc_irqs(host,
572 TMIO_MASK_READOP);
573 tasklet_schedule(&host->dma_issue);
574 }
575 } else {
576 if (!host->dma_on) {
577 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
578 } else {
579 tmio_mmc_disable_mmc_irqs(host,
580 TMIO_MASK_WRITEOP);
581 tasklet_schedule(&host->dma_issue);
582 }
583 }
584 } else {
585 schedule_work(&host->done);
586 }
587
588out:
589 spin_unlock(&host->lock);
590}
591
592static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
593 int ireg, int status)
594{
595 struct mmc_host *mmc = host->mmc;
596
597 /* Card insert / remove attempts */
598 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
599 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
600 TMIO_STAT_CARD_REMOVE);
601 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
602 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
603 !work_pending(&mmc->detect.work))
604 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
605 return true;
606 }
607
608 return false;
609}
610
611static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg,
612 int status)
613{
614 /* Command completion */
615 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
616 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND |
617 TMIO_STAT_CMDTIMEOUT);
618 tmio_mmc_cmd_irq(host, status);
619 return true;
620 }
621
622 /* Data transfer */
623 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
624 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
625 tmio_mmc_pio_irq(host);
626 return true;
627 }
628
629 /* Data transfer completion */
630 if (ireg & TMIO_STAT_DATAEND) {
631 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
632 tmio_mmc_data_irq(host, status);
633 return true;
634 }
635
636 return false;
637}
638
639static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
640{
641 struct mmc_host *mmc = host->mmc;
642 struct tmio_mmc_data *pdata = host->pdata;
643 unsigned int ireg, status;
644 unsigned int sdio_status;
645
646 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
647 return false;
648
649 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
650 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask;
651
652 sdio_status = status & ~TMIO_SDIO_MASK_ALL;
653 if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
654 sdio_status |= TMIO_SDIO_SETBITS_MASK;
655
656 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
657
658 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
659 mmc_signal_sdio_irq(mmc);
660
661 return ireg;
662}
663
664irqreturn_t tmio_mmc_irq(int irq, void *devid)
665{
666 struct tmio_mmc_host *host = devid;
667 unsigned int ireg, status;
668
669 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
670 ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
671
672 /* Clear the status except the interrupt status */
673 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ);
674
675 if (__tmio_mmc_card_detect_irq(host, ireg, status))
676 return IRQ_HANDLED;
677 if (__tmio_mmc_sdcard_irq(host, ireg, status))
678 return IRQ_HANDLED;
679
680 if (__tmio_mmc_sdio_irq(host))
681 return IRQ_HANDLED;
682
683 return IRQ_NONE;
684}
685EXPORT_SYMBOL_GPL(tmio_mmc_irq);
686
687static int tmio_mmc_start_data(struct tmio_mmc_host *host,
688 struct mmc_data *data)
689{
690 struct tmio_mmc_data *pdata = host->pdata;
691
692 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
693 data->blksz, data->blocks);
694
695 /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */
696 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 ||
697 host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
698 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
699
700 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
701 pr_err("%s: %d byte block unsupported in 4/8 bit mode\n",
702 mmc_hostname(host->mmc), data->blksz);
703 return -EINVAL;
704 }
705 }
706
707 tmio_mmc_init_sg(host, data);
708 host->data = data;
709 host->dma_on = false;
710
711 /* Set transfer length / blocksize */
712 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
713 if (host->mmc->max_blk_count >= SZ_64K)
714 sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks);
715 else
716 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
717
718 tmio_mmc_start_dma(host, data);
719
720 return 0;
721}
722
723static int tmio_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
724{
725 struct tmio_mmc_host *host = mmc_priv(mmc);
726 int ret;
727
728 if (!host->execute_tuning)
729 return 0;
730
731 ret = host->execute_tuning(host, opcode);
732
733 if (ret < 0) {
734 dev_warn(&host->pdev->dev, "Tuning procedure failed\n");
735 tmio_mmc_hw_reset(mmc);
736 }
737
738 return ret;
739}
740
741static void tmio_process_mrq(struct tmio_mmc_host *host,
742 struct mmc_request *mrq)
743{
744 struct mmc_command *cmd;
745 int ret;
746
747 if (mrq->sbc && host->cmd != mrq->sbc) {
748 cmd = mrq->sbc;
749 } else {
750 cmd = mrq->cmd;
751 if (mrq->data) {
752 ret = tmio_mmc_start_data(host, mrq->data);
753 if (ret)
754 goto fail;
755 }
756 }
757
758 ret = tmio_mmc_start_command(host, cmd);
759 if (ret)
760 goto fail;
761
762 schedule_delayed_work(&host->delayed_reset_work,
763 msecs_to_jiffies(CMDREQ_TIMEOUT));
764 return;
765
766fail:
767 host->mrq = NULL;
768 mrq->cmd->error = ret;
769 mmc_request_done(host->mmc, mrq);
770}
771
772/* Process requests from the MMC layer */
773static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
774{
775 struct tmio_mmc_host *host = mmc_priv(mmc);
776 unsigned long flags;
777
778 spin_lock_irqsave(&host->lock, flags);
779
780 if (host->mrq) {
781 pr_debug("request not null\n");
782 if (IS_ERR(host->mrq)) {
783 spin_unlock_irqrestore(&host->lock, flags);
784 mrq->cmd->error = -EAGAIN;
785 mmc_request_done(mmc, mrq);
786 return;
787 }
788 }
789
790 host->last_req_ts = jiffies;
791 wmb();
792 host->mrq = mrq;
793
794 spin_unlock_irqrestore(&host->lock, flags);
795
796 tmio_process_mrq(host, mrq);
797}
798
799static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
800{
801 struct mmc_request *mrq;
802 unsigned long flags;
803
804 spin_lock_irqsave(&host->lock, flags);
805
806 tmio_mmc_end_dma(host);
807
808 mrq = host->mrq;
809 if (IS_ERR_OR_NULL(mrq)) {
810 spin_unlock_irqrestore(&host->lock, flags);
811 return;
812 }
813
814 /* If not SET_BLOCK_COUNT, clear old data */
815 if (host->cmd != mrq->sbc) {
816 host->cmd = NULL;
817 host->data = NULL;
818 host->mrq = NULL;
819 }
820
821 cancel_delayed_work(&host->delayed_reset_work);
822
823 spin_unlock_irqrestore(&host->lock, flags);
824
825 if (mrq->cmd->error || (mrq->data && mrq->data->error))
826 tmio_mmc_abort_dma(host);
827
828 /* Error means retune, but executed command was still successful */
829 if (host->check_retune && host->check_retune(host))
830 mmc_retune_needed(host->mmc);
831
832 /* If SET_BLOCK_COUNT, continue with main command */
833 if (host->mrq && !mrq->cmd->error) {
834 tmio_process_mrq(host, mrq);
835 return;
836 }
837
838 mmc_request_done(host->mmc, mrq);
839}
840
841static void tmio_mmc_done_work(struct work_struct *work)
842{
843 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
844 done);
845 tmio_mmc_finish_request(host);
846}
847
848static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
849{
850 struct mmc_host *mmc = host->mmc;
851 int ret = 0;
852
853 /* .set_ios() is returning void, so, no chance to report an error */
854
855 if (host->set_pwr)
856 host->set_pwr(host->pdev, 1);
857
858 if (!IS_ERR(mmc->supply.vmmc)) {
859 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
860 /*
861 * Attention: empiric value. With a b43 WiFi SDIO card this
862 * delay proved necessary for reliable card-insertion probing.
863 * 100us were not enough. Is this the same 140us delay, as in
864 * tmio_mmc_set_ios()?
865 */
866 usleep_range(200, 300);
867 }
868 /*
869 * It seems, VccQ should be switched on after Vcc, this is also what the
870 * omap_hsmmc.c driver does.
871 */
872 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
873 ret = regulator_enable(mmc->supply.vqmmc);
874 usleep_range(200, 300);
875 }
876
877 if (ret < 0)
878 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
879 ret);
880}
881
882static void tmio_mmc_power_off(struct tmio_mmc_host *host)
883{
884 struct mmc_host *mmc = host->mmc;
885
886 if (!IS_ERR(mmc->supply.vqmmc))
887 regulator_disable(mmc->supply.vqmmc);
888
889 if (!IS_ERR(mmc->supply.vmmc))
890 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
891
892 if (host->set_pwr)
893 host->set_pwr(host->pdev, 0);
894}
895
896static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
897 unsigned char bus_width)
898{
899 u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
900 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
901
902 /* reg now applies to MMC_BUS_WIDTH_4 */
903 if (bus_width == MMC_BUS_WIDTH_1)
904 reg |= CARD_OPT_WIDTH;
905 else if (bus_width == MMC_BUS_WIDTH_8)
906 reg |= CARD_OPT_WIDTH8;
907
908 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
909}
910
911/* Set MMC clock / power.
912 * Note: This controller uses a simple divider scheme therefore it cannot
913 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
914 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
915 * slowest setting.
916 */
917static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
918{
919 struct tmio_mmc_host *host = mmc_priv(mmc);
920 struct device *dev = &host->pdev->dev;
921 unsigned long flags;
922
923 mutex_lock(&host->ios_lock);
924
925 spin_lock_irqsave(&host->lock, flags);
926 if (host->mrq) {
927 if (IS_ERR(host->mrq)) {
928 dev_dbg(dev,
929 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
930 current->comm, task_pid_nr(current),
931 ios->clock, ios->power_mode);
932 host->mrq = ERR_PTR(-EINTR);
933 } else {
934 dev_dbg(dev,
935 "%s.%d: CMD%u active since %lu, now %lu!\n",
936 current->comm, task_pid_nr(current),
937 host->mrq->cmd->opcode, host->last_req_ts,
938 jiffies);
939 }
940 spin_unlock_irqrestore(&host->lock, flags);
941
942 mutex_unlock(&host->ios_lock);
943 return;
944 }
945
946 host->mrq = ERR_PTR(-EBUSY);
947
948 spin_unlock_irqrestore(&host->lock, flags);
949
950 switch (ios->power_mode) {
951 case MMC_POWER_OFF:
952 tmio_mmc_power_off(host);
953 host->set_clock(host, 0);
954 break;
955 case MMC_POWER_UP:
956 tmio_mmc_power_on(host, ios->vdd);
957 host->set_clock(host, ios->clock);
958 tmio_mmc_set_bus_width(host, ios->bus_width);
959 break;
960 case MMC_POWER_ON:
961 host->set_clock(host, ios->clock);
962 tmio_mmc_set_bus_width(host, ios->bus_width);
963 break;
964 }
965
966 /* Let things settle. delay taken from winCE driver */
967 usleep_range(140, 200);
968 if (PTR_ERR(host->mrq) == -EINTR)
969 dev_dbg(&host->pdev->dev,
970 "%s.%d: IOS interrupted: clk %u, mode %u",
971 current->comm, task_pid_nr(current),
972 ios->clock, ios->power_mode);
973 host->mrq = NULL;
974
975 host->clk_cache = ios->clock;
976
977 mutex_unlock(&host->ios_lock);
978}
979
980static int tmio_mmc_get_ro(struct mmc_host *mmc)
981{
982 struct tmio_mmc_host *host = mmc_priv(mmc);
983
984 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
985 TMIO_STAT_WRPROTECT);
986}
987
988static int tmio_mmc_get_cd(struct mmc_host *mmc)
989{
990 struct tmio_mmc_host *host = mmc_priv(mmc);
991
992 return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
993 TMIO_STAT_SIGSTATE);
994}
995
996static int tmio_multi_io_quirk(struct mmc_card *card,
997 unsigned int direction, int blk_size)
998{
999 struct tmio_mmc_host *host = mmc_priv(card->host);
1000
1001 if (host->multi_io_quirk)
1002 return host->multi_io_quirk(card, direction, blk_size);
1003
1004 return blk_size;
1005}
1006
1007static struct mmc_host_ops tmio_mmc_ops = {
1008 .request = tmio_mmc_request,
1009 .set_ios = tmio_mmc_set_ios,
1010 .get_ro = tmio_mmc_get_ro,
1011 .get_cd = tmio_mmc_get_cd,
1012 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
1013 .multi_io_quirk = tmio_multi_io_quirk,
1014 .hw_reset = tmio_mmc_hw_reset,
1015 .execute_tuning = tmio_mmc_execute_tuning,
1016};
1017
1018static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
1019{
1020 struct tmio_mmc_data *pdata = host->pdata;
1021 struct mmc_host *mmc = host->mmc;
1022 int err;
1023
1024 err = mmc_regulator_get_supply(mmc);
1025 if (err)
1026 return err;
1027
1028 /* use ocr_mask if no regulator */
1029 if (!mmc->ocr_avail)
1030 mmc->ocr_avail = pdata->ocr_mask;
1031
1032 /*
1033 * try again.
1034 * There is possibility that regulator has not been probed
1035 */
1036 if (!mmc->ocr_avail)
1037 return -EPROBE_DEFER;
1038
1039 return 0;
1040}
1041
1042static void tmio_mmc_of_parse(struct platform_device *pdev,
1043 struct mmc_host *mmc)
1044{
1045 const struct device_node *np = pdev->dev.of_node;
1046
1047 if (!np)
1048 return;
1049
1050 /*
1051 * DEPRECATED:
1052 * For new platforms, please use "disable-wp" instead of
1053 * "toshiba,mmc-wrprotect-disable"
1054 */
1055 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
1056 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
1057}
1058
1059struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
1060 struct tmio_mmc_data *pdata)
1061{
1062 struct tmio_mmc_host *host;
1063 struct mmc_host *mmc;
1064 void __iomem *ctl;
1065 int ret;
1066
1067 ctl = devm_platform_ioremap_resource(pdev, 0);
1068 if (IS_ERR(ctl))
1069 return ERR_CAST(ctl);
1070
1071 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
1072 if (!mmc)
1073 return ERR_PTR(-ENOMEM);
1074
1075 host = mmc_priv(mmc);
1076 host->ctl = ctl;
1077 host->mmc = mmc;
1078 host->pdev = pdev;
1079 host->pdata = pdata;
1080 host->ops = tmio_mmc_ops;
1081 mmc->ops = &host->ops;
1082
1083 ret = mmc_of_parse(host->mmc);
1084 if (ret) {
1085 host = ERR_PTR(ret);
1086 goto free;
1087 }
1088
1089 tmio_mmc_of_parse(pdev, mmc);
1090
1091 platform_set_drvdata(pdev, host);
1092
1093 return host;
1094free:
1095 mmc_free_host(mmc);
1096
1097 return host;
1098}
1099EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc);
1100
1101void tmio_mmc_host_free(struct tmio_mmc_host *host)
1102{
1103 mmc_free_host(host->mmc);
1104}
1105EXPORT_SYMBOL_GPL(tmio_mmc_host_free);
1106
1107int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
1108{
1109 struct platform_device *pdev = _host->pdev;
1110 struct tmio_mmc_data *pdata = _host->pdata;
1111 struct mmc_host *mmc = _host->mmc;
1112 int ret;
1113
1114 /*
1115 * Check the sanity of mmc->f_min to prevent host->set_clock() from
1116 * looping forever...
1117 */
1118 if (mmc->f_min == 0)
1119 return -EINVAL;
1120
1121 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
1122 _host->write16_hook = NULL;
1123
1124 _host->set_pwr = pdata->set_pwr;
1125
1126 ret = tmio_mmc_init_ocr(_host);
1127 if (ret < 0)
1128 return ret;
1129
1130 /*
1131 * Look for a card detect GPIO, if it fails with anything
1132 * else than a probe deferral, just live without it.
1133 */
1134 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
1135 if (ret == -EPROBE_DEFER)
1136 return ret;
1137
1138 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1139 mmc->caps2 |= pdata->capabilities2;
1140 mmc->max_segs = pdata->max_segs ? : 32;
1141 mmc->max_blk_size = TMIO_MAX_BLK_SIZE;
1142 mmc->max_blk_count = pdata->max_blk_count ? :
1143 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs;
1144 mmc->max_req_size = min_t(size_t,
1145 mmc->max_blk_size * mmc->max_blk_count,
1146 dma_max_mapping_size(&pdev->dev));
1147 mmc->max_seg_size = mmc->max_req_size;
1148
1149 if (mmc_can_gpio_ro(mmc))
1150 _host->ops.get_ro = mmc_gpio_get_ro;
1151
1152 if (mmc_can_gpio_cd(mmc))
1153 _host->ops.get_cd = mmc_gpio_get_cd;
1154
1155 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) ||
1156 mmc->caps & MMC_CAP_NEEDS_POLL ||
1157 !mmc_card_is_removable(mmc));
1158
1159 if (!_host->reset)
1160 _host->reset = tmio_mmc_reset;
1161
1162 /*
1163 * On Gen2+, eMMC with NONREMOVABLE currently fails because native
1164 * hotplug gets disabled. It seems RuntimePM related yet we need further
1165 * research. Since we are planning a PM overhaul anyway, let's enforce
1166 * for now the device being active by enabling native hotplug always.
1167 */
1168 if (pdata->flags & TMIO_MMC_MIN_RCAR2)
1169 _host->native_hotplug = true;
1170
1171 /*
1172 * While using internal tmio hardware logic for card detection, we need
1173 * to ensure it stays powered for it to work.
1174 */
1175 if (_host->native_hotplug)
1176 pm_runtime_get_noresume(&pdev->dev);
1177
1178 _host->sdio_irq_enabled = false;
1179 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1180 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
1181
1182 _host->set_clock(_host, 0);
1183 tmio_mmc_hw_reset(mmc);
1184
1185 _host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK);
1186 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1187
1188 if (_host->native_hotplug)
1189 tmio_mmc_enable_mmc_irqs(_host,
1190 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1191
1192 spin_lock_init(&_host->lock);
1193 mutex_init(&_host->ios_lock);
1194
1195 /* Init delayed work for request timeouts */
1196 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1197 INIT_WORK(&_host->done, tmio_mmc_done_work);
1198
1199 /* See if we also get DMA */
1200 tmio_mmc_request_dma(_host, pdata);
1201
1202 pm_runtime_get_noresume(&pdev->dev);
1203 pm_runtime_set_active(&pdev->dev);
1204 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1205 pm_runtime_use_autosuspend(&pdev->dev);
1206 pm_runtime_enable(&pdev->dev);
1207
1208 ret = mmc_add_host(mmc);
1209 if (ret)
1210 goto remove_host;
1211
1212 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1213 pm_runtime_put(&pdev->dev);
1214
1215 return 0;
1216
1217remove_host:
1218 pm_runtime_put_noidle(&pdev->dev);
1219 tmio_mmc_host_remove(_host);
1220 return ret;
1221}
1222EXPORT_SYMBOL_GPL(tmio_mmc_host_probe);
1223
1224void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1225{
1226 struct platform_device *pdev = host->pdev;
1227 struct mmc_host *mmc = host->mmc;
1228
1229 pm_runtime_get_sync(&pdev->dev);
1230
1231 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ)
1232 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
1233
1234 dev_pm_qos_hide_latency_limit(&pdev->dev);
1235
1236 mmc_remove_host(mmc);
1237 cancel_work_sync(&host->done);
1238 cancel_delayed_work_sync(&host->delayed_reset_work);
1239 tmio_mmc_release_dma(host);
1240 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1241
1242 if (host->native_hotplug)
1243 pm_runtime_put_noidle(&pdev->dev);
1244
1245 pm_runtime_disable(&pdev->dev);
1246 pm_runtime_dont_use_autosuspend(&pdev->dev);
1247 pm_runtime_put_noidle(&pdev->dev);
1248}
1249EXPORT_SYMBOL_GPL(tmio_mmc_host_remove);
1250
1251#ifdef CONFIG_PM
1252static int tmio_mmc_clk_enable(struct tmio_mmc_host *host)
1253{
1254 if (!host->clk_enable)
1255 return -ENOTSUPP;
1256
1257 return host->clk_enable(host);
1258}
1259
1260static void tmio_mmc_clk_disable(struct tmio_mmc_host *host)
1261{
1262 if (host->clk_disable)
1263 host->clk_disable(host);
1264}
1265
1266int tmio_mmc_host_runtime_suspend(struct device *dev)
1267{
1268 struct tmio_mmc_host *host = dev_get_drvdata(dev);
1269
1270 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1271
1272 if (host->clk_cache)
1273 host->set_clock(host, 0);
1274
1275 tmio_mmc_clk_disable(host);
1276
1277 return 0;
1278}
1279EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend);
1280
1281int tmio_mmc_host_runtime_resume(struct device *dev)
1282{
1283 struct tmio_mmc_host *host = dev_get_drvdata(dev);
1284
1285 tmio_mmc_clk_enable(host);
1286 tmio_mmc_hw_reset(host->mmc);
1287
1288 if (host->clk_cache)
1289 host->set_clock(host, host->clk_cache);
1290
1291 if (host->native_hotplug)
1292 tmio_mmc_enable_mmc_irqs(host,
1293 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1294
1295 tmio_mmc_enable_dma(host, true);
1296
1297 mmc_retune_needed(host->mmc);
1298
1299 return 0;
1300}
1301EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume);
1302#endif
1303
1304MODULE_LICENSE("GPL v2");