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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/cd-gpio.h>
38#include <linux/mmc/host.h>
39#include <linux/mmc/tmio.h>
40#include <linux/module.h>
41#include <linux/pagemap.h>
42#include <linux/platform_device.h>
43#include <linux/pm_qos.h>
44#include <linux/pm_runtime.h>
45#include <linux/scatterlist.h>
46#include <linux/spinlock.h>
47#include <linux/workqueue.h>
48
49#include "tmio_mmc.h"
50
51void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
52{
53 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
54 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
55}
56
57void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
58{
59 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
60 sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
61}
62
63static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
64{
65 sd_ctrl_write32(host, CTL_STATUS, ~i);
66}
67
68static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
69{
70 host->sg_len = data->sg_len;
71 host->sg_ptr = data->sg;
72 host->sg_orig = data->sg;
73 host->sg_off = 0;
74}
75
76static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
77{
78 host->sg_ptr = sg_next(host->sg_ptr);
79 host->sg_off = 0;
80 return --host->sg_len;
81}
82
83#ifdef CONFIG_MMC_DEBUG
84
85#define STATUS_TO_TEXT(a, status, i) \
86 do { \
87 if (status & TMIO_STAT_##a) { \
88 if (i++) \
89 printk(" | "); \
90 printk(#a); \
91 } \
92 } while (0)
93
94static void pr_debug_status(u32 status)
95{
96 int i = 0;
97 pr_debug("status: %08x = ", status);
98 STATUS_TO_TEXT(CARD_REMOVE, status, i);
99 STATUS_TO_TEXT(CARD_INSERT, status, i);
100 STATUS_TO_TEXT(SIGSTATE, status, i);
101 STATUS_TO_TEXT(WRPROTECT, status, i);
102 STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
103 STATUS_TO_TEXT(CARD_INSERT_A, status, i);
104 STATUS_TO_TEXT(SIGSTATE_A, status, i);
105 STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
106 STATUS_TO_TEXT(STOPBIT_ERR, status, i);
107 STATUS_TO_TEXT(ILL_FUNC, status, i);
108 STATUS_TO_TEXT(CMD_BUSY, status, i);
109 STATUS_TO_TEXT(CMDRESPEND, status, i);
110 STATUS_TO_TEXT(DATAEND, status, i);
111 STATUS_TO_TEXT(CRCFAIL, status, i);
112 STATUS_TO_TEXT(DATATIMEOUT, status, i);
113 STATUS_TO_TEXT(CMDTIMEOUT, status, i);
114 STATUS_TO_TEXT(RXOVERFLOW, status, i);
115 STATUS_TO_TEXT(TXUNDERRUN, status, i);
116 STATUS_TO_TEXT(RXRDY, status, i);
117 STATUS_TO_TEXT(TXRQ, status, i);
118 STATUS_TO_TEXT(ILL_ACCESS, status, i);
119 printk("\n");
120}
121
122#else
123#define pr_debug_status(s) do { } while (0)
124#endif
125
126static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
127{
128 struct tmio_mmc_host *host = mmc_priv(mmc);
129
130 if (enable) {
131 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
132 ~TMIO_SDIO_STAT_IOIRQ;
133 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
134 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
135 } else {
136 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
137 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
138 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
139 }
140}
141
142static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
143{
144 u32 clk = 0, clock;
145
146 if (new_clock) {
147 for (clock = host->mmc->f_min, clk = 0x80000080;
148 new_clock >= (clock<<1); clk >>= 1)
149 clock <<= 1;
150 clk |= 0x100;
151 }
152
153 if (host->set_clk_div)
154 host->set_clk_div(host->pdev, (clk>>22) & 1);
155
156 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
157}
158
159static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
160{
161 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
162
163 /* implicit BUG_ON(!res) */
164 if (resource_size(res) > 0x100) {
165 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
166 msleep(10);
167 }
168
169 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
170 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
171 msleep(10);
172}
173
174static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
175{
176 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
177
178 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
179 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
180 msleep(10);
181
182 /* implicit BUG_ON(!res) */
183 if (resource_size(res) > 0x100) {
184 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
185 msleep(10);
186 }
187}
188
189static void tmio_mmc_reset(struct tmio_mmc_host *host)
190{
191 struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
192
193 /* FIXME - should we set stop clock reg here */
194 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
195 /* implicit BUG_ON(!res) */
196 if (resource_size(res) > 0x100)
197 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
198 msleep(10);
199 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
200 if (resource_size(res) > 0x100)
201 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
202 msleep(10);
203}
204
205static void tmio_mmc_reset_work(struct work_struct *work)
206{
207 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
208 delayed_reset_work.work);
209 struct mmc_request *mrq;
210 unsigned long flags;
211
212 spin_lock_irqsave(&host->lock, flags);
213 mrq = host->mrq;
214
215 /*
216 * is request already finished? Since we use a non-blocking
217 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
218 * us, so, have to check for IS_ERR(host->mrq)
219 */
220 if (IS_ERR_OR_NULL(mrq)
221 || time_is_after_jiffies(host->last_req_ts +
222 msecs_to_jiffies(2000))) {
223 spin_unlock_irqrestore(&host->lock, flags);
224 return;
225 }
226
227 dev_warn(&host->pdev->dev,
228 "timeout waiting for hardware interrupt (CMD%u)\n",
229 mrq->cmd->opcode);
230
231 if (host->data)
232 host->data->error = -ETIMEDOUT;
233 else if (host->cmd)
234 host->cmd->error = -ETIMEDOUT;
235 else
236 mrq->cmd->error = -ETIMEDOUT;
237
238 host->cmd = NULL;
239 host->data = NULL;
240 host->force_pio = false;
241
242 spin_unlock_irqrestore(&host->lock, flags);
243
244 tmio_mmc_reset(host);
245
246 /* Ready for new calls */
247 host->mrq = NULL;
248
249 tmio_mmc_abort_dma(host);
250 mmc_request_done(host->mmc, mrq);
251}
252
253/* called with host->lock held, interrupts disabled */
254static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
255{
256 struct mmc_request *mrq;
257 unsigned long flags;
258
259 spin_lock_irqsave(&host->lock, flags);
260
261 mrq = host->mrq;
262 if (IS_ERR_OR_NULL(mrq)) {
263 spin_unlock_irqrestore(&host->lock, flags);
264 return;
265 }
266
267 host->cmd = NULL;
268 host->data = NULL;
269 host->force_pio = false;
270
271 cancel_delayed_work(&host->delayed_reset_work);
272
273 host->mrq = NULL;
274 spin_unlock_irqrestore(&host->lock, flags);
275
276 if (mrq->cmd->error || (mrq->data && mrq->data->error))
277 tmio_mmc_abort_dma(host);
278
279 mmc_request_done(host->mmc, mrq);
280}
281
282static void tmio_mmc_done_work(struct work_struct *work)
283{
284 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
285 done);
286 tmio_mmc_finish_request(host);
287}
288
289/* These are the bitmasks the tmio chip requires to implement the MMC response
290 * types. Note that R1 and R6 are the same in this scheme. */
291#define APP_CMD 0x0040
292#define RESP_NONE 0x0300
293#define RESP_R1 0x0400
294#define RESP_R1B 0x0500
295#define RESP_R2 0x0600
296#define RESP_R3 0x0700
297#define DATA_PRESENT 0x0800
298#define TRANSFER_READ 0x1000
299#define TRANSFER_MULTI 0x2000
300#define SECURITY_CMD 0x4000
301
302static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
303{
304 struct mmc_data *data = host->data;
305 int c = cmd->opcode;
306 u32 irq_mask = TMIO_MASK_CMD;
307
308 /* Command 12 is handled by hardware */
309 if (cmd->opcode == 12 && !cmd->arg) {
310 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
311 return 0;
312 }
313
314 switch (mmc_resp_type(cmd)) {
315 case MMC_RSP_NONE: c |= RESP_NONE; break;
316 case MMC_RSP_R1: c |= RESP_R1; break;
317 case MMC_RSP_R1B: c |= RESP_R1B; break;
318 case MMC_RSP_R2: c |= RESP_R2; break;
319 case MMC_RSP_R3: c |= RESP_R3; break;
320 default:
321 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
322 return -EINVAL;
323 }
324
325 host->cmd = cmd;
326
327/* FIXME - this seems to be ok commented out but the spec suggest this bit
328 * should be set when issuing app commands.
329 * if(cmd->flags & MMC_FLAG_ACMD)
330 * c |= APP_CMD;
331 */
332 if (data) {
333 c |= DATA_PRESENT;
334 if (data->blocks > 1) {
335 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
336 c |= TRANSFER_MULTI;
337 }
338 if (data->flags & MMC_DATA_READ)
339 c |= TRANSFER_READ;
340 }
341
342 if (!host->native_hotplug)
343 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
344 tmio_mmc_enable_mmc_irqs(host, irq_mask);
345
346 /* Fire off the command */
347 sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
348 sd_ctrl_write16(host, CTL_SD_CMD, c);
349
350 return 0;
351}
352
353/*
354 * This chip always returns (at least?) as much data as you ask for.
355 * I'm unsure what happens if you ask for less than a block. This should be
356 * looked into to ensure that a funny length read doesn't hose the controller.
357 */
358static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
359{
360 struct mmc_data *data = host->data;
361 void *sg_virt;
362 unsigned short *buf;
363 unsigned int count;
364 unsigned long flags;
365
366 if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
367 pr_err("PIO IRQ in DMA mode!\n");
368 return;
369 } else if (!data) {
370 pr_debug("Spurious PIO IRQ\n");
371 return;
372 }
373
374 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
375 buf = (unsigned short *)(sg_virt + host->sg_off);
376
377 count = host->sg_ptr->length - host->sg_off;
378 if (count > data->blksz)
379 count = data->blksz;
380
381 pr_debug("count: %08x offset: %08x flags %08x\n",
382 count, host->sg_off, data->flags);
383
384 /* Transfer the data */
385 if (data->flags & MMC_DATA_READ)
386 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
387 else
388 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
389
390 host->sg_off += count;
391
392 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
393
394 if (host->sg_off == host->sg_ptr->length)
395 tmio_mmc_next_sg(host);
396
397 return;
398}
399
400static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
401{
402 if (host->sg_ptr == &host->bounce_sg) {
403 unsigned long flags;
404 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
405 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
406 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
407 }
408}
409
410/* needs to be called with host->lock held */
411void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
412{
413 struct mmc_data *data = host->data;
414 struct mmc_command *stop;
415
416 host->data = NULL;
417
418 if (!data) {
419 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
420 return;
421 }
422 stop = data->stop;
423
424 /* FIXME - return correct transfer count on errors */
425 if (!data->error)
426 data->bytes_xfered = data->blocks * data->blksz;
427 else
428 data->bytes_xfered = 0;
429
430 pr_debug("Completed data request\n");
431
432 /*
433 * FIXME: other drivers allow an optional stop command of any given type
434 * which we dont do, as the chip can auto generate them.
435 * Perhaps we can be smarter about when to use auto CMD12 and
436 * only issue the auto request when we know this is the desired
437 * stop command, allowing fallback to the stop command the
438 * upper layers expect. For now, we do what works.
439 */
440
441 if (data->flags & MMC_DATA_READ) {
442 if (host->chan_rx && !host->force_pio)
443 tmio_mmc_check_bounce_buffer(host);
444 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
445 host->mrq);
446 } else {
447 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
448 host->mrq);
449 }
450
451 if (stop) {
452 if (stop->opcode == 12 && !stop->arg)
453 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
454 else
455 BUG();
456 }
457
458 schedule_work(&host->done);
459}
460
461static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
462{
463 struct mmc_data *data;
464 spin_lock(&host->lock);
465 data = host->data;
466
467 if (!data)
468 goto out;
469
470 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
471 /*
472 * Has all data been written out yet? Testing on SuperH showed,
473 * that in most cases the first interrupt comes already with the
474 * BUSY status bit clear, but on some operations, like mount or
475 * in the beginning of a write / sync / umount, there is one
476 * DATAEND interrupt with the BUSY bit set, in this cases
477 * waiting for one more interrupt fixes the problem.
478 */
479 if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
480 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
481 tasklet_schedule(&host->dma_complete);
482 }
483 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
484 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
485 tasklet_schedule(&host->dma_complete);
486 } else {
487 tmio_mmc_do_data_irq(host);
488 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
489 }
490out:
491 spin_unlock(&host->lock);
492}
493
494static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
495 unsigned int stat)
496{
497 struct mmc_command *cmd = host->cmd;
498 int i, addr;
499
500 spin_lock(&host->lock);
501
502 if (!host->cmd) {
503 pr_debug("Spurious CMD irq\n");
504 goto out;
505 }
506
507 host->cmd = NULL;
508
509 /* This controller is sicker than the PXA one. Not only do we need to
510 * drop the top 8 bits of the first response word, we also need to
511 * modify the order of the response for short response command types.
512 */
513
514 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
515 cmd->resp[i] = sd_ctrl_read32(host, addr);
516
517 if (cmd->flags & MMC_RSP_136) {
518 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
519 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
520 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
521 cmd->resp[3] <<= 8;
522 } else if (cmd->flags & MMC_RSP_R3) {
523 cmd->resp[0] = cmd->resp[3];
524 }
525
526 if (stat & TMIO_STAT_CMDTIMEOUT)
527 cmd->error = -ETIMEDOUT;
528 else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
529 cmd->error = -EILSEQ;
530
531 /* If there is data to handle we enable data IRQs here, and
532 * we will ultimatley finish the request in the data_end handler.
533 * If theres no data or we encountered an error, finish now.
534 */
535 if (host->data && !cmd->error) {
536 if (host->data->flags & MMC_DATA_READ) {
537 if (host->force_pio || !host->chan_rx)
538 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
539 else
540 tasklet_schedule(&host->dma_issue);
541 } else {
542 if (host->force_pio || !host->chan_tx)
543 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
544 else
545 tasklet_schedule(&host->dma_issue);
546 }
547 } else {
548 schedule_work(&host->done);
549 }
550
551out:
552 spin_unlock(&host->lock);
553}
554
555static void tmio_mmc_card_irq_status(struct tmio_mmc_host *host,
556 int *ireg, int *status)
557{
558 *status = sd_ctrl_read32(host, CTL_STATUS);
559 *ireg = *status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
560
561 pr_debug_status(*status);
562 pr_debug_status(*ireg);
563}
564
565static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
566 int ireg, int status)
567{
568 struct mmc_host *mmc = host->mmc;
569
570 /* Card insert / remove attempts */
571 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
572 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
573 TMIO_STAT_CARD_REMOVE);
574 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
575 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
576 !work_pending(&mmc->detect.work))
577 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
578 return true;
579 }
580
581 return false;
582}
583
584irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid)
585{
586 unsigned int ireg, status;
587 struct tmio_mmc_host *host = devid;
588
589 tmio_mmc_card_irq_status(host, &ireg, &status);
590 __tmio_mmc_card_detect_irq(host, ireg, status);
591
592 return IRQ_HANDLED;
593}
594EXPORT_SYMBOL(tmio_mmc_card_detect_irq);
595
596static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host,
597 int ireg, int status)
598{
599 /* Command completion */
600 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
601 tmio_mmc_ack_mmc_irqs(host,
602 TMIO_STAT_CMDRESPEND |
603 TMIO_STAT_CMDTIMEOUT);
604 tmio_mmc_cmd_irq(host, status);
605 return true;
606 }
607
608 /* Data transfer */
609 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
610 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
611 tmio_mmc_pio_irq(host);
612 return true;
613 }
614
615 /* Data transfer completion */
616 if (ireg & TMIO_STAT_DATAEND) {
617 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
618 tmio_mmc_data_irq(host);
619 return true;
620 }
621
622 return false;
623}
624
625irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid)
626{
627 unsigned int ireg, status;
628 struct tmio_mmc_host *host = devid;
629
630 tmio_mmc_card_irq_status(host, &ireg, &status);
631 __tmio_mmc_sdcard_irq(host, ireg, status);
632
633 return IRQ_HANDLED;
634}
635EXPORT_SYMBOL(tmio_mmc_sdcard_irq);
636
637irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid)
638{
639 struct tmio_mmc_host *host = devid;
640 struct mmc_host *mmc = host->mmc;
641 struct tmio_mmc_data *pdata = host->pdata;
642 unsigned int ireg, status;
643
644 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
645 return IRQ_HANDLED;
646
647 status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
648 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdcard_irq_mask;
649
650 sd_ctrl_write16(host, CTL_SDIO_STATUS, status & ~TMIO_SDIO_MASK_ALL);
651
652 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
653 mmc_signal_sdio_irq(mmc);
654
655 return IRQ_HANDLED;
656}
657EXPORT_SYMBOL(tmio_mmc_sdio_irq);
658
659irqreturn_t tmio_mmc_irq(int irq, void *devid)
660{
661 struct tmio_mmc_host *host = devid;
662 unsigned int ireg, status;
663
664 pr_debug("MMC IRQ begin\n");
665
666 tmio_mmc_card_irq_status(host, &ireg, &status);
667 if (__tmio_mmc_card_detect_irq(host, ireg, status))
668 return IRQ_HANDLED;
669 if (__tmio_mmc_sdcard_irq(host, ireg, status))
670 return IRQ_HANDLED;
671
672 tmio_mmc_sdio_irq(irq, devid);
673
674 return IRQ_HANDLED;
675}
676EXPORT_SYMBOL(tmio_mmc_irq);
677
678static int tmio_mmc_start_data(struct tmio_mmc_host *host,
679 struct mmc_data *data)
680{
681 struct tmio_mmc_data *pdata = host->pdata;
682
683 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
684 data->blksz, data->blocks);
685
686 /* Some hardware cannot perform 2 byte requests in 4 bit mode */
687 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
688 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
689
690 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
691 pr_err("%s: %d byte block unsupported in 4 bit mode\n",
692 mmc_hostname(host->mmc), data->blksz);
693 return -EINVAL;
694 }
695 }
696
697 tmio_mmc_init_sg(host, data);
698 host->data = data;
699
700 /* Set transfer length / blocksize */
701 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
702 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
703
704 tmio_mmc_start_dma(host, data);
705
706 return 0;
707}
708
709/* Process requests from the MMC layer */
710static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
711{
712 struct tmio_mmc_host *host = mmc_priv(mmc);
713 unsigned long flags;
714 int ret;
715
716 spin_lock_irqsave(&host->lock, flags);
717
718 if (host->mrq) {
719 pr_debug("request not null\n");
720 if (IS_ERR(host->mrq)) {
721 spin_unlock_irqrestore(&host->lock, flags);
722 mrq->cmd->error = -EAGAIN;
723 mmc_request_done(mmc, mrq);
724 return;
725 }
726 }
727
728 host->last_req_ts = jiffies;
729 wmb();
730 host->mrq = mrq;
731
732 spin_unlock_irqrestore(&host->lock, flags);
733
734 if (mrq->data) {
735 ret = tmio_mmc_start_data(host, mrq->data);
736 if (ret)
737 goto fail;
738 }
739
740 ret = tmio_mmc_start_command(host, mrq->cmd);
741 if (!ret) {
742 schedule_delayed_work(&host->delayed_reset_work,
743 msecs_to_jiffies(2000));
744 return;
745 }
746
747fail:
748 host->force_pio = false;
749 host->mrq = NULL;
750 mrq->cmd->error = ret;
751 mmc_request_done(mmc, mrq);
752}
753
754/* Set MMC clock / power.
755 * Note: This controller uses a simple divider scheme therefore it cannot
756 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
757 * MMC wont run that fast, it has to be clocked at 12MHz which is the next
758 * slowest setting.
759 */
760static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
761{
762 struct tmio_mmc_host *host = mmc_priv(mmc);
763 struct device *dev = &host->pdev->dev;
764 unsigned long flags;
765
766 mutex_lock(&host->ios_lock);
767
768 spin_lock_irqsave(&host->lock, flags);
769 if (host->mrq) {
770 if (IS_ERR(host->mrq)) {
771 dev_dbg(dev,
772 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
773 current->comm, task_pid_nr(current),
774 ios->clock, ios->power_mode);
775 host->mrq = ERR_PTR(-EINTR);
776 } else {
777 dev_dbg(dev,
778 "%s.%d: CMD%u active since %lu, now %lu!\n",
779 current->comm, task_pid_nr(current),
780 host->mrq->cmd->opcode, host->last_req_ts, jiffies);
781 }
782 spin_unlock_irqrestore(&host->lock, flags);
783
784 mutex_unlock(&host->ios_lock);
785 return;
786 }
787
788 host->mrq = ERR_PTR(-EBUSY);
789
790 spin_unlock_irqrestore(&host->lock, flags);
791
792 /*
793 * host->power toggles between false and true in both cases - either
794 * or not the controller can be runtime-suspended during inactivity.
795 * But if the controller has to be kept on, the runtime-pm usage_count
796 * is kept positive, so no suspending actually takes place.
797 */
798 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
799 if (!host->power) {
800 pm_runtime_get_sync(dev);
801 host->power = true;
802 }
803 tmio_mmc_set_clock(host, ios->clock);
804 /* power up SD bus */
805 if (host->set_pwr)
806 host->set_pwr(host->pdev, 1);
807 /* start bus clock */
808 tmio_mmc_clk_start(host);
809 } else if (ios->power_mode != MMC_POWER_UP) {
810 if (host->set_pwr && ios->power_mode == MMC_POWER_OFF)
811 host->set_pwr(host->pdev, 0);
812 if (host->power) {
813 host->power = false;
814 pm_runtime_put(dev);
815 }
816 tmio_mmc_clk_stop(host);
817 }
818
819 switch (ios->bus_width) {
820 case MMC_BUS_WIDTH_1:
821 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
822 break;
823 case MMC_BUS_WIDTH_4:
824 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
825 break;
826 }
827
828 /* Let things settle. delay taken from winCE driver */
829 udelay(140);
830 if (PTR_ERR(host->mrq) == -EINTR)
831 dev_dbg(&host->pdev->dev,
832 "%s.%d: IOS interrupted: clk %u, mode %u",
833 current->comm, task_pid_nr(current),
834 ios->clock, ios->power_mode);
835 host->mrq = NULL;
836
837 mutex_unlock(&host->ios_lock);
838}
839
840static int tmio_mmc_get_ro(struct mmc_host *mmc)
841{
842 struct tmio_mmc_host *host = mmc_priv(mmc);
843 struct tmio_mmc_data *pdata = host->pdata;
844
845 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
846 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
847}
848
849static int tmio_mmc_get_cd(struct mmc_host *mmc)
850{
851 struct tmio_mmc_host *host = mmc_priv(mmc);
852 struct tmio_mmc_data *pdata = host->pdata;
853
854 if (!pdata->get_cd)
855 return -ENOSYS;
856 else
857 return pdata->get_cd(host->pdev);
858}
859
860static const struct mmc_host_ops tmio_mmc_ops = {
861 .request = tmio_mmc_request,
862 .set_ios = tmio_mmc_set_ios,
863 .get_ro = tmio_mmc_get_ro,
864 .get_cd = tmio_mmc_get_cd,
865 .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
866};
867
868int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
869 struct platform_device *pdev,
870 struct tmio_mmc_data *pdata)
871{
872 struct tmio_mmc_host *_host;
873 struct mmc_host *mmc;
874 struct resource *res_ctl;
875 int ret;
876 u32 irq_mask = TMIO_MASK_CMD;
877
878 res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
879 if (!res_ctl)
880 return -EINVAL;
881
882 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
883 if (!mmc)
884 return -ENOMEM;
885
886 pdata->dev = &pdev->dev;
887 _host = mmc_priv(mmc);
888 _host->pdata = pdata;
889 _host->mmc = mmc;
890 _host->pdev = pdev;
891 platform_set_drvdata(pdev, mmc);
892
893 _host->set_pwr = pdata->set_pwr;
894 _host->set_clk_div = pdata->set_clk_div;
895
896 /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
897 _host->bus_shift = resource_size(res_ctl) >> 10;
898
899 _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
900 if (!_host->ctl) {
901 ret = -ENOMEM;
902 goto host_free;
903 }
904
905 mmc->ops = &tmio_mmc_ops;
906 mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
907 mmc->f_max = pdata->hclk;
908 mmc->f_min = mmc->f_max / 512;
909 mmc->max_segs = 32;
910 mmc->max_blk_size = 512;
911 mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
912 mmc->max_segs;
913 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
914 mmc->max_seg_size = mmc->max_req_size;
915 if (pdata->ocr_mask)
916 mmc->ocr_avail = pdata->ocr_mask;
917 else
918 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
919
920 _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
921 mmc->caps & MMC_CAP_NEEDS_POLL ||
922 mmc->caps & MMC_CAP_NONREMOVABLE);
923
924 _host->power = false;
925 pm_runtime_enable(&pdev->dev);
926 ret = pm_runtime_resume(&pdev->dev);
927 if (ret < 0)
928 goto pm_disable;
929
930 /*
931 * There are 4 different scenarios for the card detection:
932 * 1) an external gpio irq handles the cd (best for power savings)
933 * 2) internal sdhi irq handles the cd
934 * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL
935 * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE
936 *
937 * While we increment the runtime PM counter for all scenarios when
938 * the mmc core activates us by calling an appropriate set_ios(), we
939 * must additionally ensure that in case 2) the tmio mmc hardware stays
940 * additionally ensure that in case 2) the tmio mmc hardware stays
941 * powered on during runtime for the card detection to work.
942 */
943 if (_host->native_hotplug)
944 pm_runtime_get_noresume(&pdev->dev);
945
946 tmio_mmc_clk_stop(_host);
947 tmio_mmc_reset(_host);
948
949 _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
950 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
951 if (pdata->flags & TMIO_MMC_SDIO_IRQ)
952 tmio_mmc_enable_sdio_irq(mmc, 0);
953
954 spin_lock_init(&_host->lock);
955 mutex_init(&_host->ios_lock);
956
957 /* Init delayed work for request timeouts */
958 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
959 INIT_WORK(&_host->done, tmio_mmc_done_work);
960
961 /* See if we also get DMA */
962 tmio_mmc_request_dma(_host, pdata);
963
964 mmc_add_host(mmc);
965
966 dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
967
968 /* Unmask the IRQs we want to know about */
969 if (!_host->chan_rx)
970 irq_mask |= TMIO_MASK_READOP;
971 if (!_host->chan_tx)
972 irq_mask |= TMIO_MASK_WRITEOP;
973 if (!_host->native_hotplug)
974 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
975
976 tmio_mmc_enable_mmc_irqs(_host, irq_mask);
977
978 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
979 ret = mmc_cd_gpio_request(mmc, pdata->cd_gpio);
980 if (ret < 0) {
981 tmio_mmc_host_remove(_host);
982 return ret;
983 }
984 }
985
986 *host = _host;
987
988 return 0;
989
990pm_disable:
991 pm_runtime_disable(&pdev->dev);
992 iounmap(_host->ctl);
993host_free:
994 mmc_free_host(mmc);
995
996 return ret;
997}
998EXPORT_SYMBOL(tmio_mmc_host_probe);
999
1000void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1001{
1002 struct platform_device *pdev = host->pdev;
1003 struct tmio_mmc_data *pdata = host->pdata;
1004 struct mmc_host *mmc = host->mmc;
1005
1006 if (pdata->flags & TMIO_MMC_USE_GPIO_CD)
1007 /*
1008 * This means we can miss a card-eject, but this is anyway
1009 * possible, because of delayed processing of hotplug events.
1010 */
1011 mmc_cd_gpio_free(mmc);
1012
1013 if (!host->native_hotplug)
1014 pm_runtime_get_sync(&pdev->dev);
1015
1016 dev_pm_qos_hide_latency_limit(&pdev->dev);
1017
1018 mmc_remove_host(mmc);
1019 cancel_work_sync(&host->done);
1020 cancel_delayed_work_sync(&host->delayed_reset_work);
1021 tmio_mmc_release_dma(host);
1022
1023 pm_runtime_put_sync(&pdev->dev);
1024 pm_runtime_disable(&pdev->dev);
1025
1026 iounmap(host->ctl);
1027 mmc_free_host(mmc);
1028}
1029EXPORT_SYMBOL(tmio_mmc_host_remove);
1030
1031#ifdef CONFIG_PM
1032int tmio_mmc_host_suspend(struct device *dev)
1033{
1034 struct mmc_host *mmc = dev_get_drvdata(dev);
1035 struct tmio_mmc_host *host = mmc_priv(mmc);
1036 int ret = mmc_suspend_host(mmc);
1037
1038 if (!ret)
1039 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1040
1041 return ret;
1042}
1043EXPORT_SYMBOL(tmio_mmc_host_suspend);
1044
1045int tmio_mmc_host_resume(struct device *dev)
1046{
1047 struct mmc_host *mmc = dev_get_drvdata(dev);
1048 struct tmio_mmc_host *host = mmc_priv(mmc);
1049
1050 tmio_mmc_reset(host);
1051 tmio_mmc_enable_dma(host, true);
1052
1053 /* The MMC core will perform the complete set up */
1054 return mmc_resume_host(mmc);
1055}
1056EXPORT_SYMBOL(tmio_mmc_host_resume);
1057
1058#endif /* CONFIG_PM */
1059
1060int tmio_mmc_host_runtime_suspend(struct device *dev)
1061{
1062 return 0;
1063}
1064EXPORT_SYMBOL(tmio_mmc_host_runtime_suspend);
1065
1066int tmio_mmc_host_runtime_resume(struct device *dev)
1067{
1068 struct mmc_host *mmc = dev_get_drvdata(dev);
1069 struct tmio_mmc_host *host = mmc_priv(mmc);
1070
1071 tmio_mmc_reset(host);
1072 tmio_mmc_enable_dma(host, true);
1073
1074 return 0;
1075}
1076EXPORT_SYMBOL(tmio_mmc_host_runtime_resume);
1077
1078MODULE_LICENSE("GPL v2");