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1/*
2 * linux/drivers/mmc/host/tmio_mmc_pio.c
3 *
4 * Copyright (C) 2011 Guennadi Liakhovetski
5 * Copyright (C) 2007 Ian Molton
6 * Copyright (C) 2004 Ian Molton
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Driver for the MMC / SD / SDIO IP found in:
13 *
14 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
15 *
16 * This driver draws mainly on scattered spec sheets, Reverse engineering
17 * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
18 * support). (Further 4 bit support from a later datasheet).
19 *
20 * TODO:
21 * Investigate using a workqueue for PIO transfers
22 * Eliminate FIXMEs
23 * SDIO support
24 * Better Power management
25 * Handle MMC errors better
26 * double buffer support
27 *
28 */
29
30#include <linux/delay.h>
31#include <linux/device.h>
32#include <linux/highmem.h>
33#include <linux/interrupt.h>
34#include <linux/io.h>
35#include <linux/irq.h>
36#include <linux/mfd/tmio.h>
37#include <linux/mmc/host.h>
38#include <linux/mmc/mmc.h>
39#include <linux/mmc/slot-gpio.h>
40#include <linux/mmc/tmio.h>
41#include <linux/module.h>
42#include <linux/pagemap.h>
43#include <linux/platform_device.h>
44#include <linux/pm_qos.h>
45#include <linux/pm_runtime.h>
46#include <linux/regulator/consumer.h>
47#include <linux/scatterlist.h>
48#include <linux/spinlock.h>
49#include <linux/workqueue.h>
50
51#include "tmio_mmc.h"
52
53void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
54{
55 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
56 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
57}
58
59void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
60{
61 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
62 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
63}
64
65static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
66{
67 sd_ctrl_write32(host, CTL_STATUS, ~i);
68}
69
70static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
71{
72 host->sg_len = data->sg_len;
73 host->sg_ptr = data->sg;
74 host->sg_orig = data->sg;
75 host->sg_off = 0;
76}
77
78static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
79{
80 host->sg_ptr = sg_next(host->sg_ptr);
81 host->sg_off = 0;
82 return --host->sg_len;
83}
84
85#ifdef CONFIG_MMC_DEBUG
86
87#define STATUS_TO_TEXT(a, status, i) \
88 do { \
89 if (status & TMIO_STAT_##a) { \
90 if (i++) \
91 printk(" | "); \
92 printk(#a); \
93 } \
94 } while (0)
95
96static void pr_debug_status(u32 status)
97{
98 int i = 0;
99 pr_debug("status: %08x = ", status);
100 STATUS_TO_TEXT(CARD_REMOVE, status, i);
101 STATUS_TO_TEXT(CARD_INSERT, status, i);
102 STATUS_TO_TEXT(SIGSTATE, status, i);
103 STATUS_TO_TEXT(WRPROTECT, status, i);
104 STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
105 STATUS_TO_TEXT(CARD_INSERT_A, status, i);
106 STATUS_TO_TEXT(SIGSTATE_A, status, i);
107 STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
108 STATUS_TO_TEXT(STOPBIT_ERR, status, i);
109 STATUS_TO_TEXT(ILL_FUNC, status, i);
110 STATUS_TO_TEXT(CMD_BUSY, status, i);
111 STATUS_TO_TEXT(CMDRESPEND, status, i);
112 STATUS_TO_TEXT(DATAEND, status, i);
113 STATUS_TO_TEXT(CRCFAIL, status, i);
114 STATUS_TO_TEXT(DATATIMEOUT, status, i);
115 STATUS_TO_TEXT(CMDTIMEOUT, status, i);
116 STATUS_TO_TEXT(RXOVERFLOW, status, i);
117 STATUS_TO_TEXT(TXUNDERRUN, status, i);
118 STATUS_TO_TEXT(RXRDY, status, i);
119 STATUS_TO_TEXT(TXRQ, status, i);
120 STATUS_TO_TEXT(ILL_ACCESS, status, i);
121 printk("\n");
122}
123
124#else
125#define pr_debug_status(s) do { } while (0)
126#endif
127
128static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
129{
130 struct tmio_mmc_host *host = mmc_priv(mmc);
131
132 if (enable) {
133 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
134 ~TMIO_SDIO_STAT_IOIRQ;
135 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
136 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
137 } else {
138 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
139 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
140 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
141 }
142}
143
144static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
145{
146 u32 clk = 0, clock;
147
148 if (new_clock) {
149 for (clock = host->mmc->f_min, clk = 0x80000080;
150 new_clock >= (clock<<1); clk >>= 1)
151 clock <<= 1;
152 clk |= 0x100;
153 }
154
155 if (host->set_clk_div)
156 host->set_clk_div(host->pdev, (clk>>22) & 1);
157
158 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
159 msleep(10);
160}
161
162static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
163{
164 /* implicit BUG_ON(!res) */
165 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
166 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
167 msleep(10);
168 }
169
170 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
171 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
172 msleep(10);
173}
174
175static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
176{
177 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
178 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
179 msleep(10);
180
181 /* implicit BUG_ON(!res) */
182 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
183 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
184 msleep(10);
185 }
186}
187
188static void tmio_mmc_reset(struct tmio_mmc_host *host)
189{
190 /* FIXME - should we set stop clock reg here */
191 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
192 /* implicit BUG_ON(!res) */
193 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
194 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
195 msleep(10);
196 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
197 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
198 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
199 msleep(10);
200}
201
202static void tmio_mmc_reset_work(struct work_struct *work)
203{
204 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
205 delayed_reset_work.work);
206 struct mmc_request *mrq;
207 unsigned long flags;
208
209 spin_lock_irqsave(&host->lock, flags);
210 mrq = host->mrq;
211
212 /*
213 * is request already finished? Since we use a non-blocking
214 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
215 * us, so, have to check for IS_ERR(host->mrq)
216 */
217 if (IS_ERR_OR_NULL(mrq)
218 || time_is_after_jiffies(host->last_req_ts +
219 msecs_to_jiffies(2000))) {
220 spin_unlock_irqrestore(&host->lock, flags);
221 return;
222 }
223
224 dev_warn(&host->pdev->dev,
225 "timeout waiting for hardware interrupt (CMD%u)\n",
226 mrq->cmd->opcode);
227
228 if (host->data)
229 host->data->error = -ETIMEDOUT;
230 else if (host->cmd)
231 host->cmd->error = -ETIMEDOUT;
232 else
233 mrq->cmd->error = -ETIMEDOUT;
234
235 host->cmd = NULL;
236 host->data = NULL;
237 host->force_pio = false;
238
239 spin_unlock_irqrestore(&host->lock, flags);
240
241 tmio_mmc_reset(host);
242
243 /* Ready for new calls */
244 host->mrq = NULL;
245
246 tmio_mmc_abort_dma(host);
247 mmc_request_done(host->mmc, mrq);
248}
249
250/* called with host->lock held, interrupts disabled */
251static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
252{
253 struct mmc_request *mrq;
254 unsigned long flags;
255
256 spin_lock_irqsave(&host->lock, flags);
257
258 mrq = host->mrq;
259 if (IS_ERR_OR_NULL(mrq)) {
260 spin_unlock_irqrestore(&host->lock, flags);
261 return;
262 }
263
264 host->cmd = NULL;
265 host->data = NULL;
266 host->force_pio = false;
267
268 cancel_delayed_work(&host->delayed_reset_work);
269
270 host->mrq = NULL;
271 spin_unlock_irqrestore(&host->lock, flags);
272
273 if (mrq->cmd->error || (mrq->data && mrq->data->error))
274 tmio_mmc_abort_dma(host);
275
276 mmc_request_done(host->mmc, mrq);
277}
278
279static void tmio_mmc_done_work(struct work_struct *work)
280{
281 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
282 done);
283 tmio_mmc_finish_request(host);
284}
285
286/* These are the bitmasks the tmio chip requires to implement the MMC response
287 * types. Note that R1 and R6 are the same in this scheme. */
288#define APP_CMD 0x0040
289#define RESP_NONE 0x0300
290#define RESP_R1 0x0400
291#define RESP_R1B 0x0500
292#define RESP_R2 0x0600
293#define RESP_R3 0x0700
294#define DATA_PRESENT 0x0800
295#define TRANSFER_READ 0x1000
296#define TRANSFER_MULTI 0x2000
297#define SECURITY_CMD 0x4000
298
299static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
300{
301 struct mmc_data *data = host->data;
302 int c = cmd->opcode;
303 u32 irq_mask = TMIO_MASK_CMD;
304
305 /* CMD12 is handled by hardware */
306 if (cmd->opcode == MMC_STOP_TRANSMISSION && !cmd->arg) {
307 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
308 return 0;
309 }
310
311 switch (mmc_resp_type(cmd)) {
312 case MMC_RSP_NONE: c |= RESP_NONE; break;
313 case MMC_RSP_R1: c |= RESP_R1; break;
314 case MMC_RSP_R1B: c |= RESP_R1B; break;
315 case MMC_RSP_R2: c |= RESP_R2; break;
316 case MMC_RSP_R3: c |= RESP_R3; break;
317 default:
318 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
319 return -EINVAL;
320 }
321
322 host->cmd = cmd;
323
324/* FIXME - this seems to be ok commented out but the spec suggest this bit
325 * should be set when issuing app commands.
326 * if(cmd->flags & MMC_FLAG_ACMD)
327 * c |= APP_CMD;
328 */
329 if (data) {
330 c |= DATA_PRESENT;
331 if (data->blocks > 1) {
332 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
333 c |= TRANSFER_MULTI;
334 }
335 if (data->flags & MMC_DATA_READ)
336 c |= TRANSFER_READ;
337 }
338
339 if (!host->native_hotplug)
340 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
341 tmio_mmc_enable_mmc_irqs(host, irq_mask);
342
343 /* Fire off the command */
344 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
345 sd_ctrl_write16(host, CTL_SD_CMD, c);
346
347 return 0;
348}
349
350/*
351 * This chip always returns (at least?) as much data as you ask for.
352 * I'm unsure what happens if you ask for less than a block. This should be
353 * looked into to ensure that a funny length read doesn't hose the controller.
354 */
355static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
356{
357 struct mmc_data *data = host->data;
358 void *sg_virt;
359 unsigned short *buf;
360 unsigned int count;
361 unsigned long flags;
362
363 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
364 pr_err("PIO IRQ in DMA mode!\n");
365 return;
366 } else if (!data) {
367 pr_debug("Spurious PIO IRQ\n");
368 return;
369 }
370
371 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
372 buf = (unsigned short *)(sg_virt + host->sg_off);
373
374 count = host->sg_ptr->length - host->sg_off;
375 if (count > data->blksz)
376 count = data->blksz;
377
378 pr_debug("count: %08x offset: %08x flags %08x\n",
379 count, host->sg_off, data->flags);
380
381 /* Transfer the data */
382 if (data->flags & MMC_DATA_READ)
383 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
384 else
385 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
386
387 host->sg_off += count;
388
389 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
390
391 if (host->sg_off == host->sg_ptr->length)
392 tmio_mmc_next_sg(host);
393
394 return;
395}
396
397static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
398{
399 if (host->sg_ptr == &host->bounce_sg) {
400 unsigned long flags;
401 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
402 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
403 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
404 }
405}
406
407/* needs to be called with host->lock held */
408void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
409{
410 struct mmc_data *data = host->data;
411 struct mmc_command *stop;
412
413 host->data = NULL;
414
415 if (!data) {
416 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
417 return;
418 }
419 stop = data->stop;
420
421 /* FIXME - return correct transfer count on errors */
422 if (!data->error)
423 data->bytes_xfered = data->blocks * data->blksz;
424 else
425 data->bytes_xfered = 0;
426
427 pr_debug("Completed data request\n");
428
429 /*
430 * FIXME: other drivers allow an optional stop command of any given type
431 * which we dont do, as the chip can auto generate them.
432 * Perhaps we can be smarter about when to use auto CMD12 and
433 * only issue the auto request when we know this is the desired
434 * stop command, allowing fallback to the stop command the
435 * upper layers expect. For now, we do what works.
436 */
437
438 if (data->flags & MMC_DATA_READ) {
439 if (host->chan_rx && !host->force_pio)
440 tmio_mmc_check_bounce_buffer(host);
441 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
442 host->mrq);
443 } else {
444 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
445 host->mrq);
446 }
447
448 if (stop) {
449 if (stop->opcode == MMC_STOP_TRANSMISSION && !stop->arg)
450 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
451 else
452 BUG();
453 }
454
455 schedule_work(&host->done);
456}
457
458static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
459{
460 struct mmc_data *data;
461 spin_lock(&host->lock);
462 data = host->data;
463
464 if (!data)
465 goto out;
466
467 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
468 /*
469 * Has all data been written out yet? Testing on SuperH showed,
470 * that in most cases the first interrupt comes already with the
471 * BUSY status bit clear, but on some operations, like mount or
472 * in the beginning of a write / sync / umount, there is one
473 * DATAEND interrupt with the BUSY bit set, in this cases
474 * waiting for one more interrupt fixes the problem.
475 */
476 if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
477 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
478 tasklet_schedule(&host->dma_complete);
479 }
480 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
481 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
482 tasklet_schedule(&host->dma_complete);
483 } else {
484 tmio_mmc_do_data_irq(host);
485 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
486 }
487out:
488 spin_unlock(&host->lock);
489}
490
491static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
492 unsigned int stat)
493{
494 struct mmc_command *cmd = host->cmd;
495 int i, addr;
496
497 spin_lock(&host->lock);
498
499 if (!host->cmd) {
500 pr_debug("Spurious CMD irq\n");
501 goto out;
502 }
503
504 host->cmd = NULL;
505
506 /* This controller is sicker than the PXA one. Not only do we need to
507 * drop the top 8 bits of the first response word, we also need to
508 * modify the order of the response for short response command types.
509 */
510
511 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
512 cmd->resp[i] = sd_ctrl_read32(host, addr);
513
514 if (cmd->flags & MMC_RSP_136) {
515 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
516 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
517 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
518 cmd->resp[3] <<= 8;
519 } else if (cmd->flags & MMC_RSP_R3) {
520 cmd->resp[0] = cmd->resp[3];
521 }
522
523 if (stat & TMIO_STAT_CMDTIMEOUT)
524 cmd->error = -ETIMEDOUT;
525 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
526 cmd->error = -EILSEQ;
527
528 /* If there is data to handle we enable data IRQs here, and
529 * we will ultimatley finish the request in the data_end handler.
530 * If theres no data or we encountered an error, finish now.
531 */
532 if (host->data && !cmd->error) {
533 if (host->data->flags & MMC_DATA_READ) {
534 if (host->force_pio || !host->chan_rx)
535 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
536 else
537 tasklet_schedule(&host->dma_issue);
538 } else {
539 if (host->force_pio || !host->chan_tx)
540 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
541 else
542 tasklet_schedule(&host->dma_issue);
543 }
544 } else {
545 schedule_work(&host->done);
546 }
547
548out:
549 spin_unlock(&host->lock);
550}
551
552static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
553 int *ireg, int *status)
554{
555 *status = sd_ctrl_read32(host, CTL_STATUS);
556 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
557
558 pr_debug_status(*status);
559 pr_debug_status(*ireg);
560}
561
562static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
563 int ireg, int status)
564{
565 struct mmc_host *mmc = host->mmc;
566
567 /* Card insert / remove attempts */
568 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
569 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
570 TMIO_STAT_CARD_REMOVE);
571 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
572 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
573 !work_pending(&mmc->detect.work))
574 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
575 return true;
576 }
577
578 return false;
579}
580
581irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
582{
583 unsigned int ireg, status;
584 struct tmio_mmc_host *host = devid;
585
586 tmio_mmc_card_irq_status(host, &ireg, &status);
587 __tmio_mmc_card_detect_irq(host, ireg, status);
588
589 return IRQ_HANDLED;
590}
591EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
592
593static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
594 int ireg, int status)
595{
596 /* Command completion */
597 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
598 tmio_mmc_ack_mmc_irqs(host,
599 TMIO_STAT_CMDRESPEND |
600 TMIO_STAT_CMDTIMEOUT);
601 tmio_mmc_cmd_irq(host, status);
602 return true;
603 }
604
605 /* Data transfer */
606 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
607 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
608 tmio_mmc_pio_irq(host);
609 return true;
610 }
611
612 /* Data transfer completion */
613 if (ireg & TMIO_STAT_DATAEND) {
614 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
615 tmio_mmc_data_irq(host);
616 return true;
617 }
618
619 return false;
620}
621
622irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
623{
624 unsigned int ireg, status;
625 struct tmio_mmc_host *host = devid;
626
627 tmio_mmc_card_irq_status(host, &ireg, &status);
628 __tmio_mmc_sdcard_irq(host, ireg, status);
629
630 return IRQ_HANDLED;
631}
632EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
633
634irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
635{
636 struct tmio_mmc_host *host = devid;
637 struct mmc_host *mmc = host->mmc;
638 struct tmio_mmc_data *pdata = host->pdata;
639 unsigned int ireg, status;
640
641 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
642 return IRQ_HANDLED;
643
644 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
645 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
646
647 sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
648
649 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
650 mmc_signal_sdio_irq(mmc);
651
652 return IRQ_HANDLED;
653}
654EXPORT_SYMBOL(tmio_mmc_sdio_irq);
655
656irqreturn_t tmio_mmc_irq(int irq, void *devid)
657{
658 struct tmio_mmc_host *host = devid;
659 unsigned int ireg, status;
660
661 pr_debug("MMC IRQ begin\n");
662
663 tmio_mmc_card_irq_status(host, &ireg, &status);
664 if (__tmio_mmc_card_detect_irq(host, ireg, status))
665 return IRQ_HANDLED;
666 if (__tmio_mmc_sdcard_irq(host, ireg, status))
667 return IRQ_HANDLED;
668
669 tmio_mmc_sdio_irq(irq, devid);
670
671 return IRQ_HANDLED;
672}
673EXPORT_SYMBOL(tmio_mmc_irq);
674
675static int tmio_mmc_start_data(struct tmio_mmc_host *host,
676 struct mmc_data *data)
677{
678 struct tmio_mmc_data *pdata = host->pdata;
679
680 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
681 data->blksz, data->blocks);
682
683 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
684 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
685 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
686
687 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
688 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
689 mmc_hostname(host->mmc), data->blksz);
690 return -EINVAL;
691 }
692 }
693
694 tmio_mmc_init_sg(host, data);
695 host->data = data;
696
697 /* Set transfer length / blocksize */
698 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
699 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
700
701 tmio_mmc_start_dma(host, data);
702
703 return 0;
704}
705
706/* Process requests from the MMC layer */
707static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
708{
709 struct tmio_mmc_host *host = mmc_priv(mmc);
710 unsigned long flags;
711 int ret;
712
713 spin_lock_irqsave(&host->lock, flags);
714
715 if (host->mrq) {
716 pr_debug("request not null\n");
717 if (IS_ERR(host->mrq)) {
718 spin_unlock_irqrestore(&host->lock, flags);
719 mrq->cmd->error = -EAGAIN;
720 mmc_request_done(mmc, mrq);
721 return;
722 }
723 }
724
725 host->last_req_ts = jiffies;
726 wmb();
727 host->mrq = mrq;
728
729 spin_unlock_irqrestore(&host->lock, flags);
730
731 if (mrq->data) {
732 ret = tmio_mmc_start_data(host, mrq->data);
733 if (ret)
734 goto fail;
735 }
736
737 ret = tmio_mmc_start_command(host, mrq->cmd);
738 if (!ret) {
739 schedule_delayed_work(&host->delayed_reset_work,
740 msecs_to_jiffies(2000));
741 return;
742 }
743
744fail:
745 host->force_pio = false;
746 host->mrq = NULL;
747 mrq->cmd->error = ret;
748 mmc_request_done(mmc, mrq);
749}
750
751static int tmio_mmc_clk_update(struct mmc_host *mmc)
752{
753 struct tmio_mmc_host *host = mmc_priv(mmc);
754 struct tmio_mmc_data *pdata = host->pdata;
755 int ret;
756
757 if (!pdata->clk_enable)
758 return -ENOTSUPP;
759
760 ret = pdata->clk_enable(host->pdev, &mmc->f_max);
761 if (!ret)
762 mmc->f_min = mmc->f_max / 512;
763
764 return ret;
765}
766
767static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
768{
769 struct mmc_host *mmc = host->mmc;
770 int ret = 0;
771
772 /* .set_ios() is returning void, so, no chance to report an error */
773
774 if (host->set_pwr)
775 host->set_pwr(host->pdev, 1);
776
777 if (!IS_ERR(mmc->supply.vmmc)) {
778 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
779 /*
780 * Attention: empiric value. With a b43 WiFi SDIO card this
781 * delay proved necessary for reliable card-insertion probing.
782 * 100us were not enough. Is this the same 140us delay, as in
783 * tmio_mmc_set_ios()?
784 */
785 udelay(200);
786 }
787 /*
788 * It seems, VccQ should be switched on after Vcc, this is also what the
789 * omap_hsmmc.c driver does.
790 */
791 if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
792 ret = regulator_enable(mmc->supply.vqmmc);
793 udelay(200);
794 }
795
796 if (ret < 0)
797 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
798 ret);
799}
800
801static void tmio_mmc_power_off(struct tmio_mmc_host *host)
802{
803 struct mmc_host *mmc = host->mmc;
804
805 if (!IS_ERR(mmc->supply.vqmmc))
806 regulator_disable(mmc->supply.vqmmc);
807
808 if (!IS_ERR(mmc->supply.vmmc))
809 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
810
811 if (host->set_pwr)
812 host->set_pwr(host->pdev, 0);
813}
814
815/* Set MMC clock / power.
816 * Note: This controller uses a simple divider scheme therefore it cannot
817 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
818 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
819 * slowest setting.
820 */
821static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
822{
823 struct tmio_mmc_host *host = mmc_priv(mmc);
824 struct device *dev = &host->pdev->dev;
825 unsigned long flags;
826
827 mutex_lock(&host->ios_lock);
828
829 spin_lock_irqsave(&host->lock, flags);
830 if (host->mrq) {
831 if (IS_ERR(host->mrq)) {
832 dev_dbg(dev,
833 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
834 current->comm, task_pid_nr(current),
835 ios->clock, ios->power_mode);
836 host->mrq = ERR_PTR(-EINTR);
837 } else {
838 dev_dbg(dev,
839 "%s.%d: CMD%u active since %lu, now %lu!\n",
840 current->comm, task_pid_nr(current),
841 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
842 }
843 spin_unlock_irqrestore(&host->lock, flags);
844
845 mutex_unlock(&host->ios_lock);
846 return;
847 }
848
849 host->mrq = ERR_PTR(-EBUSY);
850
851 spin_unlock_irqrestore(&host->lock, flags);
852
853 /*
854 * host->power toggles between false and true in both cases - either
855 * or not the controller can be runtime-suspended during inactivity.
856 * But if the controller has to be kept on, the runtime-pm usage_count
857 * is kept positive, so no suspending actually takes place.
858 */
859 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
860 if (host->power != TMIO_MMC_ON_RUN) {
861 tmio_mmc_clk_update(mmc);
862 pm_runtime_get_sync(dev);
863 if (host->resuming) {
864 tmio_mmc_reset(host);
865 host->resuming = false;
866 }
867 }
868 if (host->power == TMIO_MMC_OFF_STOP)
869 tmio_mmc_reset(host);
870 tmio_mmc_set_clock(host, ios->clock);
871 if (host->power == TMIO_MMC_OFF_STOP)
872 /* power up SD card and the bus */
873 tmio_mmc_power_on(host, ios->vdd);
874 host->power = TMIO_MMC_ON_RUN;
875 /* start bus clock */
876 tmio_mmc_clk_start(host);
877 } else if (ios->power_mode != MMC_POWER_UP) {
878 struct tmio_mmc_data *pdata = host->pdata;
879 unsigned int old_power = host->power;
880
881 if (old_power != TMIO_MMC_OFF_STOP) {
882 if (ios->power_mode == MMC_POWER_OFF) {
883 tmio_mmc_power_off(host);
884 host->power = TMIO_MMC_OFF_STOP;
885 } else {
886 host->power = TMIO_MMC_ON_STOP;
887 }
888 }
889
890 if (old_power == TMIO_MMC_ON_RUN) {
891 tmio_mmc_clk_stop(host);
892 pm_runtime_put(dev);
893 if (pdata->clk_disable)
894 pdata->clk_disable(host->pdev);
895 }
896 }
897
898 if (host->power != TMIO_MMC_OFF_STOP) {
899 switch (ios->bus_width) {
900 case MMC_BUS_WIDTH_1:
901 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
902 break;
903 case MMC_BUS_WIDTH_4:
904 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
905 break;
906 }
907 }
908
909 /* Let things settle. delay taken from winCE driver */
910 udelay(140);
911 if (PTR_ERR(host->mrq) == -EINTR)
912 dev_dbg(&host->pdev->dev,
913 "%s.%d: IOS interrupted: clk %u, mode %u",
914 current->comm, task_pid_nr(current),
915 ios->clock, ios->power_mode);
916 host->mrq = NULL;
917
918 mutex_unlock(&host->ios_lock);
919}
920
921static int tmio_mmc_get_ro(struct mmc_host *mmc)
922{
923 struct tmio_mmc_host *host = mmc_priv(mmc);
924 struct tmio_mmc_data *pdata = host->pdata;
925 int ret = mmc_gpio_get_ro(mmc);
926 if (ret >= 0)
927 return ret;
928
929 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
930 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
931}
932
933static const struct mmc_host_ops tmio_mmc_ops = {
934 .request = tmio_mmc_request,
935 .set_ios = tmio_mmc_set_ios,
936 .get_ro = tmio_mmc_get_ro,
937 .get_cd = mmc_gpio_get_cd,
938 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
939};
940
941static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
942{
943 struct tmio_mmc_data *pdata = host->pdata;
944 struct mmc_host *mmc = host->mmc;
945
946 mmc_regulator_get_supply(mmc);
947
948 /* use ocr_mask if no regulator */
949 if (!mmc->ocr_avail)
950 mmc->ocr_avail = pdata->ocr_mask;
951
952 /*
953 * try again.
954 * There is possibility that regulator has not been probed
955 */
956 if (!mmc->ocr_avail)
957 return -EPROBE_DEFER;
958
959 return 0;
960}
961
962static void tmio_mmc_of_parse(struct platform_device *pdev,
963 struct tmio_mmc_data *pdata)
964{
965 const struct device_node *np = pdev->dev.of_node;
966 if (!np)
967 return;
968
969 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
970 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE;
971}
972
973int tmio_mmc_host_probe(struct tmio_mmc_host **host,
974 struct platform_device *pdev,
975 struct tmio_mmc_data *pdata)
976{
977 struct tmio_mmc_host *_host;
978 struct mmc_host *mmc;
979 struct resource *res_ctl;
980 int ret;
981 u32 irq_mask = TMIO_MASK_CMD;
982
983 tmio_mmc_of_parse(pdev, pdata);
984
985 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
986 pdata->write16_hook = NULL;
987
988 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
989 if (!res_ctl)
990 return -EINVAL;
991
992 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
993 if (!mmc)
994 return -ENOMEM;
995
996 ret = mmc_of_parse(mmc);
997 if (ret < 0)
998 goto host_free;
999
1000 pdata->dev = &pdev->dev;
1001 _host = mmc_priv(mmc);
1002 _host->pdata = pdata;
1003 _host->mmc = mmc;
1004 _host->pdev = pdev;
1005 platform_set_drvdata(pdev, mmc);
1006
1007 _host->set_pwr = pdata->set_pwr;
1008 _host->set_clk_div = pdata->set_clk_div;
1009
1010 ret = tmio_mmc_init_ocr(_host);
1011 if (ret < 0)
1012 goto host_free;
1013
1014 _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
1015 if (!_host->ctl) {
1016 ret = -ENOMEM;
1017 goto host_free;
1018 }
1019
1020 mmc->ops = &tmio_mmc_ops;
1021 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
1022 mmc->caps2 |= pdata->capabilities2;
1023 mmc->max_segs = 32;
1024 mmc->max_blk_size = 512;
1025 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
1026 mmc->max_segs;
1027 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1028 mmc->max_seg_size = mmc->max_req_size;
1029
1030 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
1031 mmc->caps & MMC_CAP_NEEDS_POLL ||
1032 mmc->caps & MMC_CAP_NONREMOVABLE ||
1033 mmc->slot.cd_irq >= 0);
1034
1035 _host->power = TMIO_MMC_OFF_STOP;
1036 pm_runtime_enable(&pdev->dev);
1037 ret = pm_runtime_resume(&pdev->dev);
1038 if (ret < 0)
1039 goto pm_disable;
1040
1041 if (tmio_mmc_clk_update(mmc) < 0) {
1042 mmc->f_max = pdata->hclk;
1043 mmc->f_min = mmc->f_max / 512;
1044 }
1045
1046 /*
1047 * There are 4 different scenarios for the card detection:
1048 * 1) an external gpio irq handles the cd (best for power savings)
1049 * 2) internal sdhi irq handles the cd
1050 * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
1051 * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
1052 *
1053 * While we increment the runtime PM counter for all scenarios when
1054 * the mmc core activates us by calling an appropriate set_ios(), we
1055 * must additionally ensure that in case 2) the tmio mmc hardware stays
1056 * powered on during runtime for the card detection to work.
1057 */
1058 if (_host->native_hotplug)
1059 pm_runtime_get_noresume(&pdev->dev);
1060
1061 tmio_mmc_clk_stop(_host);
1062 tmio_mmc_reset(_host);
1063
1064 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
1065 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1066
1067 /* Unmask the IRQs we want to know about */
1068 if (!_host->chan_rx)
1069 irq_mask |= TMIO_MASK_READOP;
1070 if (!_host->chan_tx)
1071 irq_mask |= TMIO_MASK_WRITEOP;
1072 if (!_host->native_hotplug)
1073 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1074
1075 _host->sdcard_irq_mask &= ~irq_mask;
1076
1077 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1078 tmio_mmc_enable_sdio_irq(mmc, 0);
1079
1080 spin_lock_init(&_host->lock);
1081 mutex_init(&_host->ios_lock);
1082
1083 /* Init delayed work for request timeouts */
1084 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1085 INIT_WORK(&_host->done, tmio_mmc_done_work);
1086
1087 /* See if we also get DMA */
1088 tmio_mmc_request_dma(_host, pdata);
1089
1090 ret = mmc_add_host(mmc);
1091 if (pdata->clk_disable)
1092 pdata->clk_disable(pdev);
1093 if (ret < 0) {
1094 tmio_mmc_host_remove(_host);
1095 return ret;
1096 }
1097
1098 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1099
1100 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
1101 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
1102 if (ret < 0) {
1103 tmio_mmc_host_remove(_host);
1104 return ret;
1105 }
1106 }
1107
1108 *host = _host;
1109
1110 return 0;
1111
1112pm_disable:
1113 pm_runtime_disable(&pdev->dev);
1114 iounmap(_host->ctl);
1115host_free:
1116 mmc_free_host(mmc);
1117
1118 return ret;
1119}
1120EXPORT_SYMBOL(tmio_mmc_host_probe);
1121
1122void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1123{
1124 struct platform_device *pdev = host->pdev;
1125 struct mmc_host *mmc = host->mmc;
1126
1127 if (!host->native_hotplug)
1128 pm_runtime_get_sync(&pdev->dev);
1129
1130 dev_pm_qos_hide_latency_limit(&pdev->dev);
1131
1132 mmc_remove_host(mmc);
1133 cancel_work_sync(&host->done);
1134 cancel_delayed_work_sync(&host->delayed_reset_work);
1135 tmio_mmc_release_dma(host);
1136
1137 pm_runtime_put_sync(&pdev->dev);
1138 pm_runtime_disable(&pdev->dev);
1139
1140 iounmap(host->ctl);
1141 mmc_free_host(mmc);
1142}
1143EXPORT_SYMBOL(tmio_mmc_host_remove);
1144
1145#ifdef CONFIG_PM_SLEEP
1146int tmio_mmc_host_suspend(struct device *dev)
1147{
1148 struct mmc_host *mmc = dev_get_drvdata(dev);
1149 struct tmio_mmc_host *host = mmc_priv(mmc);
1150
1151 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1152 return 0;
1153}
1154EXPORT_SYMBOL(tmio_mmc_host_suspend);
1155
1156int tmio_mmc_host_resume(struct device *dev)
1157{
1158 struct mmc_host *mmc = dev_get_drvdata(dev);
1159 struct tmio_mmc_host *host = mmc_priv(mmc);
1160
1161 tmio_mmc_enable_dma(host, true);
1162
1163 /* The MMC core will perform the complete set up */
1164 host->resuming = true;
1165 return 0;
1166}
1167EXPORT_SYMBOL(tmio_mmc_host_resume);
1168#endif
1169
1170#ifdef CONFIG_PM_RUNTIME
1171int tmio_mmc_host_runtime_suspend(struct device *dev)
1172{
1173 return 0;
1174}
1175EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1176
1177int tmio_mmc_host_runtime_resume(struct device *dev)
1178{
1179 struct mmc_host *mmc = dev_get_drvdata(dev);
1180 struct tmio_mmc_host *host = mmc_priv(mmc);
1181
1182 tmio_mmc_enable_dma(host, true);
1183
1184 return 0;
1185}
1186EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1187#endif
1188
1189MODULE_LICENSE("GPL v2");