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mmc-omap: fix sd response type 6 vs. 1
[deliverable/linux.git] / drivers / mmc / host / omap.c
1 /*
2 * linux/drivers/media/mmc/omap.c
3 *
4 * Copyright (C) 2004 Nokia Corporation
5 * Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com>
6 * Misc hacks here and there by Tony Lindgren <tony@atomide.com>
7 * Other hacks (DMA, SD, etc) by David Brownell
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/ioport.h>
18 #include <linux/platform_device.h>
19 #include <linux/interrupt.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/delay.h>
22 #include <linux/spinlock.h>
23 #include <linux/timer.h>
24 #include <linux/mmc/host.h>
25 #include <linux/mmc/card.h>
26 #include <linux/clk.h>
27
28 #include <asm/io.h>
29 #include <asm/irq.h>
30 #include <asm/scatterlist.h>
31 #include <asm/mach-types.h>
32
33 #include <asm/arch/board.h>
34 #include <asm/arch/gpio.h>
35 #include <asm/arch/dma.h>
36 #include <asm/arch/mux.h>
37 #include <asm/arch/fpga.h>
38 #include <asm/arch/tps65010.h>
39
40 #define OMAP_MMC_REG_CMD 0x00
41 #define OMAP_MMC_REG_ARGL 0x04
42 #define OMAP_MMC_REG_ARGH 0x08
43 #define OMAP_MMC_REG_CON 0x0c
44 #define OMAP_MMC_REG_STAT 0x10
45 #define OMAP_MMC_REG_IE 0x14
46 #define OMAP_MMC_REG_CTO 0x18
47 #define OMAP_MMC_REG_DTO 0x1c
48 #define OMAP_MMC_REG_DATA 0x20
49 #define OMAP_MMC_REG_BLEN 0x24
50 #define OMAP_MMC_REG_NBLK 0x28
51 #define OMAP_MMC_REG_BUF 0x2c
52 #define OMAP_MMC_REG_SDIO 0x34
53 #define OMAP_MMC_REG_REV 0x3c
54 #define OMAP_MMC_REG_RSP0 0x40
55 #define OMAP_MMC_REG_RSP1 0x44
56 #define OMAP_MMC_REG_RSP2 0x48
57 #define OMAP_MMC_REG_RSP3 0x4c
58 #define OMAP_MMC_REG_RSP4 0x50
59 #define OMAP_MMC_REG_RSP5 0x54
60 #define OMAP_MMC_REG_RSP6 0x58
61 #define OMAP_MMC_REG_RSP7 0x5c
62 #define OMAP_MMC_REG_IOSR 0x60
63 #define OMAP_MMC_REG_SYSC 0x64
64 #define OMAP_MMC_REG_SYSS 0x68
65
66 #define OMAP_MMC_STAT_CARD_ERR (1 << 14)
67 #define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
68 #define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
69 #define OMAP_MMC_STAT_A_EMPTY (1 << 11)
70 #define OMAP_MMC_STAT_A_FULL (1 << 10)
71 #define OMAP_MMC_STAT_CMD_CRC (1 << 8)
72 #define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
73 #define OMAP_MMC_STAT_DATA_CRC (1 << 6)
74 #define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
75 #define OMAP_MMC_STAT_END_BUSY (1 << 4)
76 #define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
77 #define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
78 #define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
79
80 #define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG_##reg)
81 #define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG_##reg)
82
83 /*
84 * Command types
85 */
86 #define OMAP_MMC_CMDTYPE_BC 0
87 #define OMAP_MMC_CMDTYPE_BCR 1
88 #define OMAP_MMC_CMDTYPE_AC 2
89 #define OMAP_MMC_CMDTYPE_ADTC 3
90
91
92 #define DRIVER_NAME "mmci-omap"
93
94 /* Specifies how often in millisecs to poll for card status changes
95 * when the cover switch is open */
96 #define OMAP_MMC_SWITCH_POLL_DELAY 500
97
98 static int mmc_omap_enable_poll = 1;
99
100 struct mmc_omap_host {
101 int initialized;
102 int suspended;
103 struct mmc_request * mrq;
104 struct mmc_command * cmd;
105 struct mmc_data * data;
106 struct mmc_host * mmc;
107 struct device * dev;
108 unsigned char id; /* 16xx chips have 2 MMC blocks */
109 struct clk * iclk;
110 struct clk * fclk;
111 struct resource *mem_res;
112 void __iomem *virt_base;
113 unsigned int phys_base;
114 int irq;
115 unsigned char bus_mode;
116 unsigned char hw_bus_mode;
117
118 unsigned int sg_len;
119 int sg_idx;
120 u16 * buffer;
121 u32 buffer_bytes_left;
122 u32 total_bytes_left;
123
124 unsigned use_dma:1;
125 unsigned brs_received:1, dma_done:1;
126 unsigned dma_is_read:1;
127 unsigned dma_in_use:1;
128 int dma_ch;
129 spinlock_t dma_lock;
130 struct timer_list dma_timer;
131 unsigned dma_len;
132
133 short power_pin;
134 short wp_pin;
135
136 int switch_pin;
137 struct work_struct switch_work;
138 struct timer_list switch_timer;
139 int switch_last_state;
140 };
141
142 static inline int
143 mmc_omap_cover_is_open(struct mmc_omap_host *host)
144 {
145 if (host->switch_pin < 0)
146 return 0;
147 return omap_get_gpio_datain(host->switch_pin);
148 }
149
150 static ssize_t
151 mmc_omap_show_cover_switch(struct device *dev,
152 struct device_attribute *attr, char *buf)
153 {
154 struct mmc_omap_host *host = dev_get_drvdata(dev);
155
156 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
157 "closed");
158 }
159
160 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
161
162 static ssize_t
163 mmc_omap_show_enable_poll(struct device *dev,
164 struct device_attribute *attr, char *buf)
165 {
166 return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
167 }
168
169 static ssize_t
170 mmc_omap_store_enable_poll(struct device *dev,
171 struct device_attribute *attr, const char *buf,
172 size_t size)
173 {
174 int enable_poll;
175
176 if (sscanf(buf, "%10d", &enable_poll) != 1)
177 return -EINVAL;
178
179 if (enable_poll != mmc_omap_enable_poll) {
180 struct mmc_omap_host *host = dev_get_drvdata(dev);
181
182 mmc_omap_enable_poll = enable_poll;
183 if (enable_poll && host->switch_pin >= 0)
184 schedule_work(&host->switch_work);
185 }
186 return size;
187 }
188
189 static DEVICE_ATTR(enable_poll, 0664,
190 mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);
191
192 static void
193 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
194 {
195 u32 cmdreg;
196 u32 resptype;
197 u32 cmdtype;
198
199 host->cmd = cmd;
200
201 resptype = 0;
202 cmdtype = 0;
203
204 /* Our hardware needs to know exact type */
205 switch (mmc_resp_type(cmd)) {
206 case MMC_RSP_NONE:
207 break;
208 case MMC_RSP_R1:
209 case MMC_RSP_R1B:
210 /* resp 1, 1b, 6, 7 */
211 resptype = 1;
212 break;
213 case MMC_RSP_R2:
214 resptype = 2;
215 break;
216 case MMC_RSP_R3:
217 resptype = 3;
218 break;
219 default:
220 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
221 break;
222 }
223
224 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
225 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
226 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
227 cmdtype = OMAP_MMC_CMDTYPE_BC;
228 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
229 cmdtype = OMAP_MMC_CMDTYPE_BCR;
230 } else {
231 cmdtype = OMAP_MMC_CMDTYPE_AC;
232 }
233
234 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
235
236 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
237 cmdreg |= 1 << 6;
238
239 if (cmd->flags & MMC_RSP_BUSY)
240 cmdreg |= 1 << 11;
241
242 if (host->data && !(host->data->flags & MMC_DATA_WRITE))
243 cmdreg |= 1 << 15;
244
245 clk_enable(host->fclk);
246
247 OMAP_MMC_WRITE(host, CTO, 200);
248 OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
249 OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
250 OMAP_MMC_WRITE(host, IE,
251 OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
252 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
253 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
254 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
255 OMAP_MMC_STAT_END_OF_DATA);
256 OMAP_MMC_WRITE(host, CMD, cmdreg);
257 }
258
259 static void
260 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
261 {
262 if (host->dma_in_use) {
263 enum dma_data_direction dma_data_dir;
264
265 BUG_ON(host->dma_ch < 0);
266 if (data->error != MMC_ERR_NONE)
267 omap_stop_dma(host->dma_ch);
268 /* Release DMA channel lazily */
269 mod_timer(&host->dma_timer, jiffies + HZ);
270 if (data->flags & MMC_DATA_WRITE)
271 dma_data_dir = DMA_TO_DEVICE;
272 else
273 dma_data_dir = DMA_FROM_DEVICE;
274 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
275 dma_data_dir);
276 }
277 host->data = NULL;
278 host->sg_len = 0;
279 clk_disable(host->fclk);
280
281 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
282 * dozens of requests until the card finishes writing data.
283 * It'd be cheaper to just wait till an EOFB interrupt arrives...
284 */
285
286 if (!data->stop) {
287 host->mrq = NULL;
288 mmc_request_done(host->mmc, data->mrq);
289 return;
290 }
291
292 mmc_omap_start_command(host, data->stop);
293 }
294
295 static void
296 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
297 {
298 unsigned long flags;
299 int done;
300
301 if (!host->dma_in_use) {
302 mmc_omap_xfer_done(host, data);
303 return;
304 }
305 done = 0;
306 spin_lock_irqsave(&host->dma_lock, flags);
307 if (host->dma_done)
308 done = 1;
309 else
310 host->brs_received = 1;
311 spin_unlock_irqrestore(&host->dma_lock, flags);
312 if (done)
313 mmc_omap_xfer_done(host, data);
314 }
315
316 static void
317 mmc_omap_dma_timer(unsigned long data)
318 {
319 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
320
321 BUG_ON(host->dma_ch < 0);
322 omap_free_dma(host->dma_ch);
323 host->dma_ch = -1;
324 }
325
326 static void
327 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
328 {
329 unsigned long flags;
330 int done;
331
332 done = 0;
333 spin_lock_irqsave(&host->dma_lock, flags);
334 if (host->brs_received)
335 done = 1;
336 else
337 host->dma_done = 1;
338 spin_unlock_irqrestore(&host->dma_lock, flags);
339 if (done)
340 mmc_omap_xfer_done(host, data);
341 }
342
343 static void
344 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
345 {
346 host->cmd = NULL;
347
348 if (cmd->flags & MMC_RSP_PRESENT) {
349 if (cmd->flags & MMC_RSP_136) {
350 /* response type 2 */
351 cmd->resp[3] =
352 OMAP_MMC_READ(host, RSP0) |
353 (OMAP_MMC_READ(host, RSP1) << 16);
354 cmd->resp[2] =
355 OMAP_MMC_READ(host, RSP2) |
356 (OMAP_MMC_READ(host, RSP3) << 16);
357 cmd->resp[1] =
358 OMAP_MMC_READ(host, RSP4) |
359 (OMAP_MMC_READ(host, RSP5) << 16);
360 cmd->resp[0] =
361 OMAP_MMC_READ(host, RSP6) |
362 (OMAP_MMC_READ(host, RSP7) << 16);
363 } else {
364 /* response types 1, 1b, 3, 4, 5, 6 */
365 cmd->resp[0] =
366 OMAP_MMC_READ(host, RSP6) |
367 (OMAP_MMC_READ(host, RSP7) << 16);
368 }
369 }
370
371 if (host->data == NULL || cmd->error != MMC_ERR_NONE) {
372 host->mrq = NULL;
373 clk_disable(host->fclk);
374 mmc_request_done(host->mmc, cmd->mrq);
375 }
376 }
377
378 /* PIO only */
379 static void
380 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
381 {
382 struct scatterlist *sg;
383
384 sg = host->data->sg + host->sg_idx;
385 host->buffer_bytes_left = sg->length;
386 host->buffer = page_address(sg->page) + sg->offset;
387 if (host->buffer_bytes_left > host->total_bytes_left)
388 host->buffer_bytes_left = host->total_bytes_left;
389 }
390
391 /* PIO only */
392 static void
393 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
394 {
395 int n;
396
397 if (host->buffer_bytes_left == 0) {
398 host->sg_idx++;
399 BUG_ON(host->sg_idx == host->sg_len);
400 mmc_omap_sg_to_buf(host);
401 }
402 n = 64;
403 if (n > host->buffer_bytes_left)
404 n = host->buffer_bytes_left;
405 host->buffer_bytes_left -= n;
406 host->total_bytes_left -= n;
407 host->data->bytes_xfered += n;
408
409 if (write) {
410 __raw_writesw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
411 } else {
412 __raw_readsw(host->virt_base + OMAP_MMC_REG_DATA, host->buffer, n);
413 }
414 }
415
416 static inline void mmc_omap_report_irq(u16 status)
417 {
418 static const char *mmc_omap_status_bits[] = {
419 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
420 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
421 };
422 int i, c = 0;
423
424 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
425 if (status & (1 << i)) {
426 if (c)
427 printk(" ");
428 printk("%s", mmc_omap_status_bits[i]);
429 c++;
430 }
431 }
432
433 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
434 {
435 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
436 u16 status;
437 int end_command;
438 int end_transfer;
439 int transfer_error;
440
441 if (host->cmd == NULL && host->data == NULL) {
442 status = OMAP_MMC_READ(host, STAT);
443 dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
444 if (status != 0) {
445 OMAP_MMC_WRITE(host, STAT, status);
446 OMAP_MMC_WRITE(host, IE, 0);
447 }
448 return IRQ_HANDLED;
449 }
450
451 end_command = 0;
452 end_transfer = 0;
453 transfer_error = 0;
454
455 while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
456 OMAP_MMC_WRITE(host, STAT, status);
457 #ifdef CONFIG_MMC_DEBUG
458 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
459 status, host->cmd != NULL ? host->cmd->opcode : -1);
460 mmc_omap_report_irq(status);
461 printk("\n");
462 #endif
463 if (host->total_bytes_left) {
464 if ((status & OMAP_MMC_STAT_A_FULL) ||
465 (status & OMAP_MMC_STAT_END_OF_DATA))
466 mmc_omap_xfer_data(host, 0);
467 if (status & OMAP_MMC_STAT_A_EMPTY)
468 mmc_omap_xfer_data(host, 1);
469 }
470
471 if (status & OMAP_MMC_STAT_END_OF_DATA) {
472 end_transfer = 1;
473 }
474
475 if (status & OMAP_MMC_STAT_DATA_TOUT) {
476 dev_dbg(mmc_dev(host->mmc), "data timeout\n");
477 if (host->data) {
478 host->data->error |= MMC_ERR_TIMEOUT;
479 transfer_error = 1;
480 }
481 }
482
483 if (status & OMAP_MMC_STAT_DATA_CRC) {
484 if (host->data) {
485 host->data->error |= MMC_ERR_BADCRC;
486 dev_dbg(mmc_dev(host->mmc),
487 "data CRC error, bytes left %d\n",
488 host->total_bytes_left);
489 transfer_error = 1;
490 } else {
491 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
492 }
493 }
494
495 if (status & OMAP_MMC_STAT_CMD_TOUT) {
496 /* Timeouts are routine with some commands */
497 if (host->cmd) {
498 if (host->cmd->opcode != MMC_ALL_SEND_CID &&
499 host->cmd->opcode !=
500 MMC_SEND_OP_COND &&
501 host->cmd->opcode !=
502 MMC_APP_CMD &&
503 !mmc_omap_cover_is_open(host))
504 dev_err(mmc_dev(host->mmc),
505 "command timeout, CMD %d\n",
506 host->cmd->opcode);
507 host->cmd->error = MMC_ERR_TIMEOUT;
508 end_command = 1;
509 }
510 }
511
512 if (status & OMAP_MMC_STAT_CMD_CRC) {
513 if (host->cmd) {
514 dev_err(mmc_dev(host->mmc),
515 "command CRC error (CMD%d, arg 0x%08x)\n",
516 host->cmd->opcode, host->cmd->arg);
517 host->cmd->error = MMC_ERR_BADCRC;
518 end_command = 1;
519 } else
520 dev_err(mmc_dev(host->mmc),
521 "command CRC error without cmd?\n");
522 }
523
524 if (status & OMAP_MMC_STAT_CARD_ERR) {
525 dev_dbg(mmc_dev(host->mmc),
526 "ignoring card status error (CMD%d)\n",
527 host->cmd->opcode);
528 end_command = 1;
529 }
530
531 /*
532 * NOTE: On 1610 the END_OF_CMD may come too early when
533 * starting a write
534 */
535 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
536 (!(status & OMAP_MMC_STAT_A_EMPTY))) {
537 end_command = 1;
538 }
539 }
540
541 if (end_command) {
542 mmc_omap_cmd_done(host, host->cmd);
543 }
544 if (transfer_error)
545 mmc_omap_xfer_done(host, host->data);
546 else if (end_transfer)
547 mmc_omap_end_of_data(host, host->data);
548
549 return IRQ_HANDLED;
550 }
551
552 static irqreturn_t mmc_omap_switch_irq(int irq, void *dev_id)
553 {
554 struct mmc_omap_host *host = (struct mmc_omap_host *) dev_id;
555
556 schedule_work(&host->switch_work);
557
558 return IRQ_HANDLED;
559 }
560
561 static void mmc_omap_switch_timer(unsigned long arg)
562 {
563 struct mmc_omap_host *host = (struct mmc_omap_host *) arg;
564
565 schedule_work(&host->switch_work);
566 }
567
568 static void mmc_omap_switch_handler(struct work_struct *work)
569 {
570 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, switch_work);
571 struct mmc_card *card;
572 static int complained = 0;
573 int cards = 0, cover_open;
574
575 if (host->switch_pin == -1)
576 return;
577 cover_open = mmc_omap_cover_is_open(host);
578 if (cover_open != host->switch_last_state) {
579 kobject_uevent(&host->dev->kobj, KOBJ_CHANGE);
580 host->switch_last_state = cover_open;
581 }
582 mmc_detect_change(host->mmc, 0);
583 list_for_each_entry(card, &host->mmc->cards, node) {
584 if (mmc_card_present(card))
585 cards++;
586 }
587 if (mmc_omap_cover_is_open(host)) {
588 if (!complained) {
589 dev_info(mmc_dev(host->mmc), "cover is open\n");
590 complained = 1;
591 }
592 if (mmc_omap_enable_poll)
593 mod_timer(&host->switch_timer, jiffies +
594 msecs_to_jiffies(OMAP_MMC_SWITCH_POLL_DELAY));
595 } else {
596 complained = 0;
597 }
598 }
599
600 /* Prepare to transfer the next segment of a scatterlist */
601 static void
602 mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
603 {
604 int dma_ch = host->dma_ch;
605 unsigned long data_addr;
606 u16 buf, frame;
607 u32 count;
608 struct scatterlist *sg = &data->sg[host->sg_idx];
609 int src_port = 0;
610 int dst_port = 0;
611 int sync_dev = 0;
612
613 data_addr = host->phys_base + OMAP_MMC_REG_DATA;
614 frame = data->blksz;
615 count = sg_dma_len(sg);
616
617 if ((data->blocks == 1) && (count > data->blksz))
618 count = frame;
619
620 host->dma_len = count;
621
622 /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
623 * Use 16 or 32 word frames when the blocksize is at least that large.
624 * Blocksize is usually 512 bytes; but not for some SD reads.
625 */
626 if (cpu_is_omap15xx() && frame > 32)
627 frame = 32;
628 else if (frame > 64)
629 frame = 64;
630 count /= frame;
631 frame >>= 1;
632
633 if (!(data->flags & MMC_DATA_WRITE)) {
634 buf = 0x800f | ((frame - 1) << 8);
635
636 if (cpu_class_is_omap1()) {
637 src_port = OMAP_DMA_PORT_TIPB;
638 dst_port = OMAP_DMA_PORT_EMIFF;
639 }
640 if (cpu_is_omap24xx())
641 sync_dev = OMAP24XX_DMA_MMC1_RX;
642
643 omap_set_dma_src_params(dma_ch, src_port,
644 OMAP_DMA_AMODE_CONSTANT,
645 data_addr, 0, 0);
646 omap_set_dma_dest_params(dma_ch, dst_port,
647 OMAP_DMA_AMODE_POST_INC,
648 sg_dma_address(sg), 0, 0);
649 omap_set_dma_dest_data_pack(dma_ch, 1);
650 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
651 } else {
652 buf = 0x0f80 | ((frame - 1) << 0);
653
654 if (cpu_class_is_omap1()) {
655 src_port = OMAP_DMA_PORT_EMIFF;
656 dst_port = OMAP_DMA_PORT_TIPB;
657 }
658 if (cpu_is_omap24xx())
659 sync_dev = OMAP24XX_DMA_MMC1_TX;
660
661 omap_set_dma_dest_params(dma_ch, dst_port,
662 OMAP_DMA_AMODE_CONSTANT,
663 data_addr, 0, 0);
664 omap_set_dma_src_params(dma_ch, src_port,
665 OMAP_DMA_AMODE_POST_INC,
666 sg_dma_address(sg), 0, 0);
667 omap_set_dma_src_data_pack(dma_ch, 1);
668 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
669 }
670
671 /* Max limit for DMA frame count is 0xffff */
672 BUG_ON(count > 0xffff);
673
674 OMAP_MMC_WRITE(host, BUF, buf);
675 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
676 frame, count, OMAP_DMA_SYNC_FRAME,
677 sync_dev, 0);
678 }
679
680 /* A scatterlist segment completed */
681 static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
682 {
683 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
684 struct mmc_data *mmcdat = host->data;
685
686 if (unlikely(host->dma_ch < 0)) {
687 dev_err(mmc_dev(host->mmc),
688 "DMA callback while DMA not enabled\n");
689 return;
690 }
691 /* FIXME: We really should do something to _handle_ the errors */
692 if (ch_status & OMAP1_DMA_TOUT_IRQ) {
693 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
694 return;
695 }
696 if (ch_status & OMAP_DMA_DROP_IRQ) {
697 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
698 return;
699 }
700 if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
701 return;
702 }
703 mmcdat->bytes_xfered += host->dma_len;
704 host->sg_idx++;
705 if (host->sg_idx < host->sg_len) {
706 mmc_omap_prepare_dma(host, host->data);
707 omap_start_dma(host->dma_ch);
708 } else
709 mmc_omap_dma_done(host, host->data);
710 }
711
712 static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
713 {
714 const char *dev_name;
715 int sync_dev, dma_ch, is_read, r;
716
717 is_read = !(data->flags & MMC_DATA_WRITE);
718 del_timer_sync(&host->dma_timer);
719 if (host->dma_ch >= 0) {
720 if (is_read == host->dma_is_read)
721 return 0;
722 omap_free_dma(host->dma_ch);
723 host->dma_ch = -1;
724 }
725
726 if (is_read) {
727 if (host->id == 1) {
728 sync_dev = OMAP_DMA_MMC_RX;
729 dev_name = "MMC1 read";
730 } else {
731 sync_dev = OMAP_DMA_MMC2_RX;
732 dev_name = "MMC2 read";
733 }
734 } else {
735 if (host->id == 1) {
736 sync_dev = OMAP_DMA_MMC_TX;
737 dev_name = "MMC1 write";
738 } else {
739 sync_dev = OMAP_DMA_MMC2_TX;
740 dev_name = "MMC2 write";
741 }
742 }
743 r = omap_request_dma(sync_dev, dev_name, mmc_omap_dma_cb,
744 host, &dma_ch);
745 if (r != 0) {
746 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
747 return r;
748 }
749 host->dma_ch = dma_ch;
750 host->dma_is_read = is_read;
751
752 return 0;
753 }
754
755 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
756 {
757 u16 reg;
758
759 reg = OMAP_MMC_READ(host, SDIO);
760 reg &= ~(1 << 5);
761 OMAP_MMC_WRITE(host, SDIO, reg);
762 /* Set maximum timeout */
763 OMAP_MMC_WRITE(host, CTO, 0xff);
764 }
765
766 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
767 {
768 int timeout;
769 u16 reg;
770
771 /* Convert ns to clock cycles by assuming 20MHz frequency
772 * 1 cycle at 20MHz = 500 ns
773 */
774 timeout = req->data->timeout_clks + req->data->timeout_ns / 500;
775
776 /* Check if we need to use timeout multiplier register */
777 reg = OMAP_MMC_READ(host, SDIO);
778 if (timeout > 0xffff) {
779 reg |= (1 << 5);
780 timeout /= 1024;
781 } else
782 reg &= ~(1 << 5);
783 OMAP_MMC_WRITE(host, SDIO, reg);
784 OMAP_MMC_WRITE(host, DTO, timeout);
785 }
786
787 static void
788 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
789 {
790 struct mmc_data *data = req->data;
791 int i, use_dma, block_size;
792 unsigned sg_len;
793
794 host->data = data;
795 if (data == NULL) {
796 OMAP_MMC_WRITE(host, BLEN, 0);
797 OMAP_MMC_WRITE(host, NBLK, 0);
798 OMAP_MMC_WRITE(host, BUF, 0);
799 host->dma_in_use = 0;
800 set_cmd_timeout(host, req);
801 return;
802 }
803
804 block_size = data->blksz;
805
806 OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
807 OMAP_MMC_WRITE(host, BLEN, block_size - 1);
808 set_data_timeout(host, req);
809
810 /* cope with calling layer confusion; it issues "single
811 * block" writes using multi-block scatterlists.
812 */
813 sg_len = (data->blocks == 1) ? 1 : data->sg_len;
814
815 /* Only do DMA for entire blocks */
816 use_dma = host->use_dma;
817 if (use_dma) {
818 for (i = 0; i < sg_len; i++) {
819 if ((data->sg[i].length % block_size) != 0) {
820 use_dma = 0;
821 break;
822 }
823 }
824 }
825
826 host->sg_idx = 0;
827 if (use_dma) {
828 if (mmc_omap_get_dma_channel(host, data) == 0) {
829 enum dma_data_direction dma_data_dir;
830
831 if (data->flags & MMC_DATA_WRITE)
832 dma_data_dir = DMA_TO_DEVICE;
833 else
834 dma_data_dir = DMA_FROM_DEVICE;
835
836 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
837 sg_len, dma_data_dir);
838 host->total_bytes_left = 0;
839 mmc_omap_prepare_dma(host, req->data);
840 host->brs_received = 0;
841 host->dma_done = 0;
842 host->dma_in_use = 1;
843 } else
844 use_dma = 0;
845 }
846
847 /* Revert to PIO? */
848 if (!use_dma) {
849 OMAP_MMC_WRITE(host, BUF, 0x1f1f);
850 host->total_bytes_left = data->blocks * block_size;
851 host->sg_len = sg_len;
852 mmc_omap_sg_to_buf(host);
853 host->dma_in_use = 0;
854 }
855 }
856
857 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
858 {
859 struct mmc_omap_host *host = mmc_priv(mmc);
860
861 WARN_ON(host->mrq != NULL);
862
863 host->mrq = req;
864
865 /* only touch fifo AFTER the controller readies it */
866 mmc_omap_prepare_data(host, req);
867 mmc_omap_start_command(host, req->cmd);
868 if (host->dma_in_use)
869 omap_start_dma(host->dma_ch);
870 }
871
872 static void innovator_fpga_socket_power(int on)
873 {
874 #if defined(CONFIG_MACH_OMAP_INNOVATOR) && defined(CONFIG_ARCH_OMAP15XX)
875 if (on) {
876 fpga_write(fpga_read(OMAP1510_FPGA_POWER) | (1 << 3),
877 OMAP1510_FPGA_POWER);
878 } else {
879 fpga_write(fpga_read(OMAP1510_FPGA_POWER) & ~(1 << 3),
880 OMAP1510_FPGA_POWER);
881 }
882 #endif
883 }
884
885 /*
886 * Turn the socket power on/off. Innovator uses FPGA, most boards
887 * probably use GPIO.
888 */
889 static void mmc_omap_power(struct mmc_omap_host *host, int on)
890 {
891 if (on) {
892 if (machine_is_omap_innovator())
893 innovator_fpga_socket_power(1);
894 else if (machine_is_omap_h2())
895 tps65010_set_gpio_out_value(GPIO3, HIGH);
896 else if (machine_is_omap_h3())
897 /* GPIO 4 of TPS65010 sends SD_EN signal */
898 tps65010_set_gpio_out_value(GPIO4, HIGH);
899 else if (cpu_is_omap24xx()) {
900 u16 reg = OMAP_MMC_READ(host, CON);
901 OMAP_MMC_WRITE(host, CON, reg | (1 << 11));
902 } else
903 if (host->power_pin >= 0)
904 omap_set_gpio_dataout(host->power_pin, 1);
905 } else {
906 if (machine_is_omap_innovator())
907 innovator_fpga_socket_power(0);
908 else if (machine_is_omap_h2())
909 tps65010_set_gpio_out_value(GPIO3, LOW);
910 else if (machine_is_omap_h3())
911 tps65010_set_gpio_out_value(GPIO4, LOW);
912 else if (cpu_is_omap24xx()) {
913 u16 reg = OMAP_MMC_READ(host, CON);
914 OMAP_MMC_WRITE(host, CON, reg & ~(1 << 11));
915 } else
916 if (host->power_pin >= 0)
917 omap_set_gpio_dataout(host->power_pin, 0);
918 }
919 }
920
921 static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
922 {
923 struct mmc_omap_host *host = mmc_priv(mmc);
924 int func_clk_rate = clk_get_rate(host->fclk);
925 int dsor;
926
927 if (ios->clock == 0)
928 return 0;
929
930 dsor = func_clk_rate / ios->clock;
931 if (dsor < 1)
932 dsor = 1;
933
934 if (func_clk_rate / dsor > ios->clock)
935 dsor++;
936
937 if (dsor > 250)
938 dsor = 250;
939 dsor++;
940
941 if (ios->bus_width == MMC_BUS_WIDTH_4)
942 dsor |= 1 << 15;
943
944 return dsor;
945 }
946
947 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
948 {
949 struct mmc_omap_host *host = mmc_priv(mmc);
950 int dsor;
951 int i;
952
953 dsor = mmc_omap_calc_divisor(mmc, ios);
954 host->bus_mode = ios->bus_mode;
955 host->hw_bus_mode = host->bus_mode;
956
957 switch (ios->power_mode) {
958 case MMC_POWER_OFF:
959 mmc_omap_power(host, 0);
960 break;
961 case MMC_POWER_UP:
962 /* Cannot touch dsor yet, just power up MMC */
963 mmc_omap_power(host, 1);
964 return;
965 case MMC_POWER_ON:
966 dsor |= 1 << 11;
967 break;
968 }
969
970 clk_enable(host->fclk);
971
972 /* On insanely high arm_per frequencies something sometimes
973 * goes somehow out of sync, and the POW bit is not being set,
974 * which results in the while loop below getting stuck.
975 * Writing to the CON register twice seems to do the trick. */
976 for (i = 0; i < 2; i++)
977 OMAP_MMC_WRITE(host, CON, dsor);
978 if (ios->power_mode == MMC_POWER_ON) {
979 /* Send clock cycles, poll completion */
980 OMAP_MMC_WRITE(host, IE, 0);
981 OMAP_MMC_WRITE(host, STAT, 0xffff);
982 OMAP_MMC_WRITE(host, CMD, 1 << 7);
983 while ((OMAP_MMC_READ(host, STAT) & 1) == 0);
984 OMAP_MMC_WRITE(host, STAT, 1);
985 }
986 clk_disable(host->fclk);
987 }
988
989 static int mmc_omap_get_ro(struct mmc_host *mmc)
990 {
991 struct mmc_omap_host *host = mmc_priv(mmc);
992
993 return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
994 }
995
996 static const struct mmc_host_ops mmc_omap_ops = {
997 .request = mmc_omap_request,
998 .set_ios = mmc_omap_set_ios,
999 .get_ro = mmc_omap_get_ro,
1000 };
1001
1002 static int __init mmc_omap_probe(struct platform_device *pdev)
1003 {
1004 struct omap_mmc_conf *minfo = pdev->dev.platform_data;
1005 struct mmc_host *mmc;
1006 struct mmc_omap_host *host = NULL;
1007 struct resource *res;
1008 int ret = 0;
1009 int irq;
1010
1011 if (minfo == NULL) {
1012 dev_err(&pdev->dev, "platform data missing\n");
1013 return -ENXIO;
1014 }
1015
1016 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1017 irq = platform_get_irq(pdev, 0);
1018 if (res == NULL || irq < 0)
1019 return -ENXIO;
1020
1021 res = request_mem_region(res->start, res->end - res->start + 1,
1022 pdev->name);
1023 if (res == NULL)
1024 return -EBUSY;
1025
1026 mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
1027 if (mmc == NULL) {
1028 ret = -ENOMEM;
1029 goto err_free_mem_region;
1030 }
1031
1032 host = mmc_priv(mmc);
1033 host->mmc = mmc;
1034
1035 spin_lock_init(&host->dma_lock);
1036 init_timer(&host->dma_timer);
1037 host->dma_timer.function = mmc_omap_dma_timer;
1038 host->dma_timer.data = (unsigned long) host;
1039
1040 host->id = pdev->id;
1041 host->mem_res = res;
1042 host->irq = irq;
1043
1044 if (cpu_is_omap24xx()) {
1045 host->iclk = clk_get(&pdev->dev, "mmc_ick");
1046 if (IS_ERR(host->iclk))
1047 goto err_free_mmc_host;
1048 clk_enable(host->iclk);
1049 }
1050
1051 if (!cpu_is_omap24xx())
1052 host->fclk = clk_get(&pdev->dev, "mmc_ck");
1053 else
1054 host->fclk = clk_get(&pdev->dev, "mmc_fck");
1055
1056 if (IS_ERR(host->fclk)) {
1057 ret = PTR_ERR(host->fclk);
1058 goto err_free_iclk;
1059 }
1060
1061 /* REVISIT:
1062 * Also, use minfo->cover to decide how to manage
1063 * the card detect sensing.
1064 */
1065 host->power_pin = minfo->power_pin;
1066 host->switch_pin = minfo->switch_pin;
1067 host->wp_pin = minfo->wp_pin;
1068 host->use_dma = 1;
1069 host->dma_ch = -1;
1070
1071 host->irq = irq;
1072 host->phys_base = host->mem_res->start;
1073 host->virt_base = (void __iomem *) IO_ADDRESS(host->phys_base);
1074
1075 mmc->ops = &mmc_omap_ops;
1076 mmc->f_min = 400000;
1077 mmc->f_max = 24000000;
1078 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1079 mmc->caps = MMC_CAP_MULTIWRITE | MMC_CAP_BYTEBLOCK;
1080
1081 if (minfo->wire4)
1082 mmc->caps |= MMC_CAP_4_BIT_DATA;
1083
1084 /* Use scatterlist DMA to reduce per-transfer costs.
1085 * NOTE max_seg_size assumption that small blocks aren't
1086 * normally used (except e.g. for reading SD registers).
1087 */
1088 mmc->max_phys_segs = 32;
1089 mmc->max_hw_segs = 32;
1090 mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
1091 mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
1092 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1093 mmc->max_seg_size = mmc->max_req_size;
1094
1095 if (host->power_pin >= 0) {
1096 if ((ret = omap_request_gpio(host->power_pin)) != 0) {
1097 dev_err(mmc_dev(host->mmc),
1098 "Unable to get GPIO pin for MMC power\n");
1099 goto err_free_fclk;
1100 }
1101 omap_set_gpio_direction(host->power_pin, 0);
1102 }
1103
1104 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1105 if (ret)
1106 goto err_free_power_gpio;
1107
1108 host->dev = &pdev->dev;
1109 platform_set_drvdata(pdev, host);
1110
1111 if (host->switch_pin >= 0) {
1112 INIT_WORK(&host->switch_work, mmc_omap_switch_handler);
1113 init_timer(&host->switch_timer);
1114 host->switch_timer.function = mmc_omap_switch_timer;
1115 host->switch_timer.data = (unsigned long) host;
1116 if (omap_request_gpio(host->switch_pin) != 0) {
1117 dev_warn(mmc_dev(host->mmc), "Unable to get GPIO pin for MMC cover switch\n");
1118 host->switch_pin = -1;
1119 goto no_switch;
1120 }
1121
1122 omap_set_gpio_direction(host->switch_pin, 1);
1123 ret = request_irq(OMAP_GPIO_IRQ(host->switch_pin),
1124 mmc_omap_switch_irq, IRQF_TRIGGER_RISING, DRIVER_NAME, host);
1125 if (ret) {
1126 dev_warn(mmc_dev(host->mmc), "Unable to get IRQ for MMC cover switch\n");
1127 omap_free_gpio(host->switch_pin);
1128 host->switch_pin = -1;
1129 goto no_switch;
1130 }
1131 ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
1132 if (ret == 0) {
1133 ret = device_create_file(&pdev->dev, &dev_attr_enable_poll);
1134 if (ret != 0)
1135 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1136 }
1137 if (ret) {
1138 dev_warn(mmc_dev(host->mmc), "Unable to create sysfs attributes\n");
1139 free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1140 omap_free_gpio(host->switch_pin);
1141 host->switch_pin = -1;
1142 goto no_switch;
1143 }
1144 if (mmc_omap_enable_poll && mmc_omap_cover_is_open(host))
1145 schedule_work(&host->switch_work);
1146 }
1147
1148 mmc_add_host(mmc);
1149
1150 return 0;
1151
1152 no_switch:
1153 /* FIXME: Free other resources too. */
1154 if (host) {
1155 if (host->iclk && !IS_ERR(host->iclk))
1156 clk_put(host->iclk);
1157 if (host->fclk && !IS_ERR(host->fclk))
1158 clk_put(host->fclk);
1159 mmc_free_host(host->mmc);
1160 }
1161 err_free_power_gpio:
1162 if (host->power_pin >= 0)
1163 omap_free_gpio(host->power_pin);
1164 err_free_fclk:
1165 clk_put(host->fclk);
1166 err_free_iclk:
1167 if (host->iclk != NULL) {
1168 clk_disable(host->iclk);
1169 clk_put(host->iclk);
1170 }
1171 err_free_mmc_host:
1172 mmc_free_host(host->mmc);
1173 err_free_mem_region:
1174 release_mem_region(res->start, res->end - res->start + 1);
1175 return ret;
1176 }
1177
1178 static int mmc_omap_remove(struct platform_device *pdev)
1179 {
1180 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1181
1182 platform_set_drvdata(pdev, NULL);
1183
1184 BUG_ON(host == NULL);
1185
1186 mmc_remove_host(host->mmc);
1187 free_irq(host->irq, host);
1188
1189 if (host->power_pin >= 0)
1190 omap_free_gpio(host->power_pin);
1191 if (host->switch_pin >= 0) {
1192 device_remove_file(&pdev->dev, &dev_attr_enable_poll);
1193 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1194 free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1195 omap_free_gpio(host->switch_pin);
1196 host->switch_pin = -1;
1197 del_timer_sync(&host->switch_timer);
1198 flush_scheduled_work();
1199 }
1200 if (host->iclk && !IS_ERR(host->iclk))
1201 clk_put(host->iclk);
1202 if (host->fclk && !IS_ERR(host->fclk))
1203 clk_put(host->fclk);
1204
1205 release_mem_region(pdev->resource[0].start,
1206 pdev->resource[0].end - pdev->resource[0].start + 1);
1207
1208 mmc_free_host(host->mmc);
1209
1210 return 0;
1211 }
1212
1213 #ifdef CONFIG_PM
1214 static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1215 {
1216 int ret = 0;
1217 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1218
1219 if (host && host->suspended)
1220 return 0;
1221
1222 if (host) {
1223 ret = mmc_suspend_host(host->mmc, mesg);
1224 if (ret == 0)
1225 host->suspended = 1;
1226 }
1227 return ret;
1228 }
1229
1230 static int mmc_omap_resume(struct platform_device *pdev)
1231 {
1232 int ret = 0;
1233 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1234
1235 if (host && !host->suspended)
1236 return 0;
1237
1238 if (host) {
1239 ret = mmc_resume_host(host->mmc);
1240 if (ret == 0)
1241 host->suspended = 0;
1242 }
1243
1244 return ret;
1245 }
1246 #else
1247 #define mmc_omap_suspend NULL
1248 #define mmc_omap_resume NULL
1249 #endif
1250
1251 static struct platform_driver mmc_omap_driver = {
1252 .probe = mmc_omap_probe,
1253 .remove = mmc_omap_remove,
1254 .suspend = mmc_omap_suspend,
1255 .resume = mmc_omap_resume,
1256 .driver = {
1257 .name = DRIVER_NAME,
1258 },
1259 };
1260
1261 static int __init mmc_omap_init(void)
1262 {
1263 return platform_driver_register(&mmc_omap_driver);
1264 }
1265
1266 static void __exit mmc_omap_exit(void)
1267 {
1268 platform_driver_unregister(&mmc_omap_driver);
1269 }
1270
1271 module_init(mmc_omap_init);
1272 module_exit(mmc_omap_exit);
1273
1274 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1275 MODULE_LICENSE("GPL");
1276 MODULE_ALIAS(DRIVER_NAME);
1277 MODULE_AUTHOR("Juha Yrjölä");
Linux kernel - Deliverables
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