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authorCarlos Aguiar <carlos.aguiar@indt.org.br>2006-03-29 03:21:00 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-03-29 03:21:00 -0500
commit730c9b7e6630f786fcec026fb11d2e6f2c90fdcb (patch)
tree970dd7cbb3d2c877c29b75ad222402396bdd1fc1 /drivers/mmc/omap.c
parent224b148ef7c9a00642eb33dbdf62f2840bde974f (diff)
[MMC] Add OMAP MMC host driver
Adds OMAP MMC driver. Signed-off-by: Juha Yrjölä <juha.yrjola@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Carlos Aguiar <carlos.aguiar@indt.org.br> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/omap.c')
-rw-r--r--drivers/mmc/omap.c1231
1 files changed, 1231 insertions, 0 deletions
diff --git a/drivers/mmc/omap.c b/drivers/mmc/omap.c
new file mode 100644
index 000000000000..49fb2ea4b7ee
--- /dev/null
+++ b/drivers/mmc/omap.c
@@ -0,0 +1,1231 @@
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/config.h>
15
16#ifdef CONFIG_MMC_DEBUG
17#define DEBUG /* for dev_dbg(), pr_debug(), etc */
18#endif
19
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/init.h>
23#include <linux/ioport.h>
24#include <linux/platform_device.h>
25#include <linux/interrupt.h>
26#include <linux/dma-mapping.h>
27#include <linux/delay.h>
28#include <linux/spinlock.h>
29#include <linux/timer.h>
30#include <linux/mmc/host.h>
31#include <linux/mmc/protocol.h>
32#include <linux/mmc/card.h>
33#include <linux/clk.h>
34
35#include <asm/io.h>
36#include <asm/irq.h>
37#include <asm/scatterlist.h>
38#include <asm/mach-types.h>
39
40#include <asm/arch/board.h>
41#include <asm/arch/gpio.h>
42#include <asm/arch/dma.h>
43#include <asm/arch/mux.h>
44#include <asm/arch/fpga.h>
45#include <asm/arch/tps65010.h>
46
47#include "omap.h"
48
49#define DRIVER_NAME "mmci-omap"
50#define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
51
52/* Specifies how often in millisecs to poll for card status changes
53 * when the cover switch is open */
54#define OMAP_MMC_SWITCH_POLL_DELAY 500
55
56static int mmc_omap_enable_poll = 1;
57
58struct mmc_omap_host {
59 int initialized;
60 int suspended;
61 struct mmc_request * mrq;
62 struct mmc_command * cmd;
63 struct mmc_data * data;
64 struct mmc_host * mmc;
65 struct device * dev;
66 unsigned char id; /* 16xx chips have 2 MMC blocks */
67 struct clk * iclk;
68 struct clk * fclk;
69 void __iomem *base;
70 int irq;
71 unsigned char bus_mode;
72 unsigned char hw_bus_mode;
73
74 unsigned int sg_len;
75 int sg_idx;
76 u16 * buffer;
77 u32 buffer_bytes_left;
78 u32 total_bytes_left;
79
80 unsigned use_dma:1;
81 unsigned brs_received:1, dma_done:1;
82 unsigned dma_is_read:1;
83 unsigned dma_in_use:1;
84 int dma_ch;
85 spinlock_t dma_lock;
86 struct timer_list dma_timer;
87 unsigned dma_len;
88
89 short power_pin;
90 short wp_pin;
91
92 int switch_pin;
93 struct work_struct switch_work;
94 struct timer_list switch_timer;
95 int switch_last_state;
96};
97
98static inline int
99mmc_omap_cover_is_open(struct mmc_omap_host *host)
100{
101 if (host->switch_pin < 0)
102 return 0;
103 return omap_get_gpio_datain(host->switch_pin);
104}
105
106static ssize_t
107mmc_omap_show_cover_switch(struct device *dev,
108 struct device_attribute *attr, char *buf)
109{
110 struct mmc_omap_host *host = dev_get_drvdata(dev);
111
112 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(host) ? "open" :
113 "closed");
114}
115
116static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
117
118static ssize_t
119mmc_omap_show_enable_poll(struct device *dev,
120 struct device_attribute *attr, char *buf)
121{
122 return snprintf(buf, PAGE_SIZE, "%d\n", mmc_omap_enable_poll);
123}
124
125static ssize_t
126mmc_omap_store_enable_poll(struct device *dev,
127 struct device_attribute *attr, const char *buf,
128 size_t size)
129{
130 int enable_poll;
131
132 if (sscanf(buf, "%10d", &enable_poll) != 1)
133 return -EINVAL;
134
135 if (enable_poll != mmc_omap_enable_poll) {
136 struct mmc_omap_host *host = dev_get_drvdata(dev);
137
138 mmc_omap_enable_poll = enable_poll;
139 if (enable_poll && host->switch_pin >= 0)
140 schedule_work(&host->switch_work);
141 }
142 return size;
143}
144
145static DEVICE_ATTR(enable_poll, 0664,
146 mmc_omap_show_enable_poll, mmc_omap_store_enable_poll);
147
148static void
149mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
150{
151 u32 cmdreg;
152 u32 resptype;
153 u32 cmdtype;
154
155 host->cmd = cmd;
156
157 resptype = 0;
158 cmdtype = 0;
159
160 /* Our hardware needs to know exact type */
161 switch (RSP_TYPE(mmc_resp_type(cmd))) {
162 case RSP_TYPE(MMC_RSP_R1):
163 /* resp 1, resp 1b */
164 resptype = 1;
165 break;
166 case RSP_TYPE(MMC_RSP_R2):
167 resptype = 2;
168 break;
169 case RSP_TYPE(MMC_RSP_R3):
170 resptype = 3;
171 break;
172 default:
173 break;
174 }
175
176 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
177 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
178 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
179 cmdtype = OMAP_MMC_CMDTYPE_BC;
180 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
181 cmdtype = OMAP_MMC_CMDTYPE_BCR;
182 } else {
183 cmdtype = OMAP_MMC_CMDTYPE_AC;
184 }
185
186 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
187
188 if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
189 cmdreg |= 1 << 6;
190
191 if (cmd->flags & MMC_RSP_BUSY)
192 cmdreg |= 1 << 11;
193
194 if (host->data && !(host->data->flags & MMC_DATA_WRITE))
195 cmdreg |= 1 << 15;
196
197 clk_enable(host->fclk);
198
199 OMAP_MMC_WRITE(host->base, CTO, 200);
200 OMAP_MMC_WRITE(host->base, ARGL, cmd->arg & 0xffff);
201 OMAP_MMC_WRITE(host->base, ARGH, cmd->arg >> 16);
202 OMAP_MMC_WRITE(host->base, IE,
203 OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
204 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
205 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
206 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
207 OMAP_MMC_STAT_END_OF_DATA);
208 OMAP_MMC_WRITE(host->base, CMD, cmdreg);
209}
210
211static void
212mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
213{
214 if (host->dma_in_use) {
215 enum dma_data_direction dma_data_dir;
216
217 BUG_ON(host->dma_ch < 0);
218 if (data->error != MMC_ERR_NONE)
219 omap_stop_dma(host->dma_ch);
220 /* Release DMA channel lazily */
221 mod_timer(&host->dma_timer, jiffies + HZ);
222 if (data->flags & MMC_DATA_WRITE)
223 dma_data_dir = DMA_TO_DEVICE;
224 else
225 dma_data_dir = DMA_FROM_DEVICE;
226 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
227 dma_data_dir);
228 }
229 host->data = NULL;
230 host->sg_len = 0;
231 clk_disable(host->fclk);
232
233 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
234 * dozens of requests until the card finishes writing data.
235 * It'd be cheaper to just wait till an EOFB interrupt arrives...
236 */
237
238 if (!data->stop) {
239 host->mrq = NULL;
240 mmc_request_done(host->mmc, data->mrq);
241 return;
242 }
243
244 mmc_omap_start_command(host, data->stop);
245}
246
247static void
248mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
249{
250 unsigned long flags;
251 int done;
252
253 if (!host->dma_in_use) {
254 mmc_omap_xfer_done(host, data);
255 return;
256 }
257 done = 0;
258 spin_lock_irqsave(&host->dma_lock, flags);
259 if (host->dma_done)
260 done = 1;
261 else
262 host->brs_received = 1;
263 spin_unlock_irqrestore(&host->dma_lock, flags);
264 if (done)
265 mmc_omap_xfer_done(host, data);
266}
267
268static void
269mmc_omap_dma_timer(unsigned long data)
270{
271 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
272
273 BUG_ON(host->dma_ch < 0);
274 omap_free_dma(host->dma_ch);
275 host->dma_ch = -1;
276}
277
278static void
279mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
280{
281 unsigned long flags;
282 int done;
283
284 done = 0;
285 spin_lock_irqsave(&host->dma_lock, flags);
286 if (host->brs_received)
287 done = 1;
288 else
289 host->dma_done = 1;
290 spin_unlock_irqrestore(&host->dma_lock, flags);
291 if (done)
292 mmc_omap_xfer_done(host, data);
293}
294
295static void
296mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
297{
298 host->cmd = NULL;
299
300 if (cmd->flags & MMC_RSP_PRESENT) {
301 if (cmd->flags & MMC_RSP_136) {
302 /* response type 2 */
303 cmd->resp[3] =
304 OMAP_MMC_READ(host->base, RSP0) |
305 (OMAP_MMC_READ(host->base, RSP1) << 16);
306 cmd->resp[2] =
307 OMAP_MMC_READ(host->base, RSP2) |
308 (OMAP_MMC_READ(host->base, RSP3) << 16);
309 cmd->resp[1] =
310 OMAP_MMC_READ(host->base, RSP4) |
311 (OMAP_MMC_READ(host->base, RSP5) << 16);
312 cmd->resp[0] =
313 OMAP_MMC_READ(host->base, RSP6) |
314 (OMAP_MMC_READ(host->base, RSP7) << 16);
315 } else {
316 /* response types 1, 1b, 3, 4, 5, 6 */
317 cmd->resp[0] =
318 OMAP_MMC_READ(host->base, RSP6) |
319 (OMAP_MMC_READ(host->base, RSP7) << 16);
320 }
321 }
322
323 if (host->data == NULL || cmd->error != MMC_ERR_NONE) {
324 host->mrq = NULL;
325 clk_disable(host->fclk);
326 mmc_request_done(host->mmc, cmd->mrq);
327 }
328}
329
330/* PIO only */
331static void
332mmc_omap_sg_to_buf(struct mmc_omap_host *host)
333{
334 struct scatterlist *sg;
335
336 sg = host->data->sg + host->sg_idx;
337 host->buffer_bytes_left = sg->length;
338 host->buffer = page_address(sg->page) + sg->offset;
339 if (host->buffer_bytes_left > host->total_bytes_left)
340 host->buffer_bytes_left = host->total_bytes_left;
341}
342
343/* PIO only */
344static void
345mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
346{
347 int n;
348 void __iomem *reg;
349 u16 *p;
350
351 if (host->buffer_bytes_left == 0) {
352 host->sg_idx++;
353 BUG_ON(host->sg_idx == host->sg_len);
354 mmc_omap_sg_to_buf(host);
355 }
356 n = 64;
357 if (n > host->buffer_bytes_left)
358 n = host->buffer_bytes_left;
359 host->buffer_bytes_left -= n;
360 host->total_bytes_left -= n;
361 host->data->bytes_xfered += n;
362
363 if (write) {
364 __raw_writesw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
365 } else {
366 __raw_readsw(host->base + OMAP_MMC_REG_DATA, host->buffer, n);
367 }
368}
369
370static inline void mmc_omap_report_irq(u16 status)
371{
372 static const char *mmc_omap_status_bits[] = {
373 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
374 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
375 };
376 int i, c = 0;
377
378 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
379 if (status & (1 << i)) {
380 if (c)
381 printk(" ");
382 printk("%s", mmc_omap_status_bits[i]);
383 c++;
384 }
385}
386
387static irqreturn_t mmc_omap_irq(int irq, void *dev_id, struct pt_regs *regs)
388{
389 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
390 u16 status;
391 int end_command;
392 int end_transfer;
393 int transfer_error;
394
395 if (host->cmd == NULL && host->data == NULL) {
396 status = OMAP_MMC_READ(host->base, STAT);
397 dev_info(mmc_dev(host->mmc),"spurious irq 0x%04x\n", status);
398 if (status != 0) {
399 OMAP_MMC_WRITE(host->base, STAT, status);
400 OMAP_MMC_WRITE(host->base, IE, 0);
401 }
402 return IRQ_HANDLED;
403 }
404
405 end_command = 0;
406 end_transfer = 0;
407 transfer_error = 0;
408
409 while ((status = OMAP_MMC_READ(host->base, STAT)) != 0) {
410 OMAP_MMC_WRITE(host->base, STAT, status);
411#ifdef CONFIG_MMC_DEBUG
412 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
413 status, host->cmd != NULL ? host->cmd->opcode : -1);
414 mmc_omap_report_irq(status);
415 printk("\n");
416#endif
417 if (host->total_bytes_left) {
418 if ((status & OMAP_MMC_STAT_A_FULL) ||
419 (status & OMAP_MMC_STAT_END_OF_DATA))
420 mmc_omap_xfer_data(host, 0);
421 if (status & OMAP_MMC_STAT_A_EMPTY)
422 mmc_omap_xfer_data(host, 1);
423 }
424
425 if (status & OMAP_MMC_STAT_END_OF_DATA) {
426 end_transfer = 1;
427 }
428
429 if (status & OMAP_MMC_STAT_DATA_TOUT) {
430 dev_dbg(mmc_dev(host->mmc), "data timeout\n");
431 if (host->data) {
432 host->data->error |= MMC_ERR_TIMEOUT;
433 transfer_error = 1;
434 }
435 }
436
437 if (status & OMAP_MMC_STAT_DATA_CRC) {
438 if (host->data) {
439 host->data->error |= MMC_ERR_BADCRC;
440 dev_dbg(mmc_dev(host->mmc),
441 "data CRC error, bytes left %d\n",
442 host->total_bytes_left);
443 transfer_error = 1;
444 } else {
445 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
446 }
447 }
448
449 if (status & OMAP_MMC_STAT_CMD_TOUT) {
450 /* Timeouts are routine with some commands */
451 if (host->cmd) {
452 if (host->cmd->opcode != MMC_ALL_SEND_CID &&
453 host->cmd->opcode !=
454 MMC_SEND_OP_COND &&
455 host->cmd->opcode !=
456 MMC_APP_CMD &&
457 !mmc_omap_cover_is_open(host))
458 dev_err(mmc_dev(host->mmc),
459 "command timeout, CMD %d\n",
460 host->cmd->opcode);
461 host->cmd->error = MMC_ERR_TIMEOUT;
462 end_command = 1;
463 }
464 }
465
466 if (status & OMAP_MMC_STAT_CMD_CRC) {
467 if (host->cmd) {
468 dev_err(mmc_dev(host->mmc),
469 "command CRC error (CMD%d, arg 0x%08x)\n",
470 host->cmd->opcode, host->cmd->arg);
471 host->cmd->error = MMC_ERR_BADCRC;
472 end_command = 1;
473 } else
474 dev_err(mmc_dev(host->mmc),
475 "command CRC error without cmd?\n");
476 }
477
478 if (status & OMAP_MMC_STAT_CARD_ERR) {
479 if (host->cmd && host->cmd->opcode == MMC_STOP_TRANSMISSION) {
480 u32 response = OMAP_MMC_READ(host->base, RSP6)
481 | (OMAP_MMC_READ(host->base, RSP7) << 16);
482 /* STOP sometimes sets must-ignore bits */
483 if (!(response & (R1_CC_ERROR
484 | R1_ILLEGAL_COMMAND
485 | R1_COM_CRC_ERROR))) {
486 end_command = 1;
487 continue;
488 }
489 }
490
491 dev_dbg(mmc_dev(host->mmc), "card status error (CMD%d)\n",
492 host->cmd->opcode);
493 if (host->cmd) {
494 host->cmd->error = MMC_ERR_FAILED;
495 end_command = 1;
496 }
497 if (host->data) {
498 host->data->error = MMC_ERR_FAILED;
499 transfer_error = 1;
500 }
501 }
502
503 /*
504 * NOTE: On 1610 the END_OF_CMD may come too early when
505 * starting a write
506 */
507 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
508 (!(status & OMAP_MMC_STAT_A_EMPTY))) {
509 end_command = 1;
510 }
511 }
512
513 if (end_command) {
514 mmc_omap_cmd_done(host, host->cmd);
515 }
516 if (transfer_error)
517 mmc_omap_xfer_done(host, host->data);
518 else if (end_transfer)
519 mmc_omap_end_of_data(host, host->data);
520
521 return IRQ_HANDLED;
522}
523
524static irqreturn_t mmc_omap_switch_irq(int irq, void *dev_id, struct pt_regs *regs)
525{
526 struct mmc_omap_host *host = (struct mmc_omap_host *) dev_id;
527
528 schedule_work(&host->switch_work);
529
530 return IRQ_HANDLED;
531}
532
533static void mmc_omap_switch_timer(unsigned long arg)
534{
535 struct mmc_omap_host *host = (struct mmc_omap_host *) arg;
536
537 schedule_work(&host->switch_work);
538}
539
540/* FIXME: Handle card insertion and removal properly. Maybe use a mask
541 * for MMC state? */
542static void mmc_omap_switch_callback(unsigned long data, u8 mmc_mask)
543{
544}
545
546static void mmc_omap_switch_handler(void *data)
547{
548 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
549 struct mmc_card *card;
550 static int complained = 0;
551 int cards = 0, cover_open;
552
553 if (host->switch_pin == -1)
554 return;
555 cover_open = mmc_omap_cover_is_open(host);
556 if (cover_open != host->switch_last_state) {
557 kobject_uevent(&host->dev->kobj, KOBJ_CHANGE);
558 host->switch_last_state = cover_open;
559 }
560 mmc_detect_change(host->mmc, 0);
561 list_for_each_entry(card, &host->mmc->cards, node) {
562 if (mmc_card_present(card))
563 cards++;
564 }
565 if (mmc_omap_cover_is_open(host)) {
566 if (!complained) {
567 dev_info(mmc_dev(host->mmc), "cover is open");
568 complained = 1;
569 }
570 if (mmc_omap_enable_poll)
571 mod_timer(&host->switch_timer, jiffies +
572 msecs_to_jiffies(OMAP_MMC_SWITCH_POLL_DELAY));
573 } else {
574 complained = 0;
575 }
576}
577
578/* Prepare to transfer the next segment of a scatterlist */
579static void
580mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
581{
582 int dma_ch = host->dma_ch;
583 unsigned long data_addr;
584 u16 buf, frame;
585 u32 count;
586 struct scatterlist *sg = &data->sg[host->sg_idx];
587 int src_port = 0;
588 int dst_port = 0;
589 int sync_dev = 0;
590
591 data_addr = io_v2p((u32) host->base) + OMAP_MMC_REG_DATA;
592 frame = 1 << data->blksz_bits;
593 count = sg_dma_len(sg);
594
595 if ((data->blocks == 1) && (count > (1 << data->blksz_bits)))
596 count = frame;
597
598 host->dma_len = count;
599
600 /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
601 * Use 16 or 32 word frames when the blocksize is at least that large.
602 * Blocksize is usually 512 bytes; but not for some SD reads.
603 */
604 if (cpu_is_omap15xx() && frame > 32)
605 frame = 32;
606 else if (frame > 64)
607 frame = 64;
608 count /= frame;
609 frame >>= 1;
610
611 if (!(data->flags & MMC_DATA_WRITE)) {
612 buf = 0x800f | ((frame - 1) << 8);
613
614 if (cpu_class_is_omap1()) {
615 src_port = OMAP_DMA_PORT_TIPB;
616 dst_port = OMAP_DMA_PORT_EMIFF;
617 }
618 if (cpu_is_omap24xx())
619 sync_dev = OMAP24XX_DMA_MMC1_RX;
620
621 omap_set_dma_src_params(dma_ch, src_port,
622 OMAP_DMA_AMODE_CONSTANT,
623 data_addr, 0, 0);
624 omap_set_dma_dest_params(dma_ch, dst_port,
625 OMAP_DMA_AMODE_POST_INC,
626 sg_dma_address(sg), 0, 0);
627 omap_set_dma_dest_data_pack(dma_ch, 1);
628 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
629 } else {
630 buf = 0x0f80 | ((frame - 1) << 0);
631
632 if (cpu_class_is_omap1()) {
633 src_port = OMAP_DMA_PORT_EMIFF;
634 dst_port = OMAP_DMA_PORT_TIPB;
635 }
636 if (cpu_is_omap24xx())
637 sync_dev = OMAP24XX_DMA_MMC1_TX;
638
639 omap_set_dma_dest_params(dma_ch, dst_port,
640 OMAP_DMA_AMODE_CONSTANT,
641 data_addr, 0, 0);
642 omap_set_dma_src_params(dma_ch, src_port,
643 OMAP_DMA_AMODE_POST_INC,
644 sg_dma_address(sg), 0, 0);
645 omap_set_dma_src_data_pack(dma_ch, 1);
646 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
647 }
648
649 /* Max limit for DMA frame count is 0xffff */
650 if (unlikely(count > 0xffff))
651 BUG();
652
653 OMAP_MMC_WRITE(host->base, BUF, buf);
654 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
655 frame, count, OMAP_DMA_SYNC_FRAME,
656 sync_dev, 0);
657}
658
659/* A scatterlist segment completed */
660static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
661{
662 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
663 struct mmc_data *mmcdat = host->data;
664
665 if (unlikely(host->dma_ch < 0)) {
666 dev_err(mmc_dev(host->mmc), "DMA callback while DMA not
667 enabled\n");
668 return;
669 }
670 /* FIXME: We really should do something to _handle_ the errors */
671 if (ch_status & OMAP_DMA_TOUT_IRQ) {
672 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
673 return;
674 }
675 if (ch_status & OMAP_DMA_DROP_IRQ) {
676 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
677 return;
678 }
679 if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
680 return;
681 }
682 mmcdat->bytes_xfered += host->dma_len;
683 host->sg_idx++;
684 if (host->sg_idx < host->sg_len) {
685 mmc_omap_prepare_dma(host, host->data);
686 omap_start_dma(host->dma_ch);
687 } else
688 mmc_omap_dma_done(host, host->data);
689}
690
691static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
692{
693 const char *dev_name;
694 int sync_dev, dma_ch, is_read, r;
695
696 is_read = !(data->flags & MMC_DATA_WRITE);
697 del_timer_sync(&host->dma_timer);
698 if (host->dma_ch >= 0) {
699 if (is_read == host->dma_is_read)
700 return 0;
701 omap_free_dma(host->dma_ch);
702 host->dma_ch = -1;
703 }
704
705 if (is_read) {
706 if (host->id == 1) {
707 sync_dev = OMAP_DMA_MMC_RX;
708 dev_name = "MMC1 read";
709 } else {
710 sync_dev = OMAP_DMA_MMC2_RX;
711 dev_name = "MMC2 read";
712 }
713 } else {
714 if (host->id == 1) {
715 sync_dev = OMAP_DMA_MMC_TX;
716 dev_name = "MMC1 write";
717 } else {
718 sync_dev = OMAP_DMA_MMC2_TX;
719 dev_name = "MMC2 write";
720 }
721 }
722 r = omap_request_dma(sync_dev, dev_name, mmc_omap_dma_cb,
723 host, &dma_ch);
724 if (r != 0) {
725 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
726 return r;
727 }
728 host->dma_ch = dma_ch;
729 host->dma_is_read = is_read;
730
731 return 0;
732}
733
734static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
735{
736 u16 reg;
737
738 reg = OMAP_MMC_READ(host->base, SDIO);
739 reg &= ~(1 << 5);
740 OMAP_MMC_WRITE(host->base, SDIO, reg);
741 /* Set maximum timeout */
742 OMAP_MMC_WRITE(host->base, CTO, 0xff);
743}
744
745static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
746{
747 int timeout;
748 u16 reg;
749
750 /* Convert ns to clock cycles by assuming 20MHz frequency
751 * 1 cycle at 20MHz = 500 ns
752 */
753 timeout = req->data->timeout_clks + req->data->timeout_ns / 500;
754
755 /* Check if we need to use timeout multiplier register */
756 reg = OMAP_MMC_READ(host->base, SDIO);
757 if (timeout > 0xffff) {
758 reg |= (1 << 5);
759 timeout /= 1024;
760 } else
761 reg &= ~(1 << 5);
762 OMAP_MMC_WRITE(host->base, SDIO, reg);
763 OMAP_MMC_WRITE(host->base, DTO, timeout);
764}
765
766static void
767mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
768{
769 struct mmc_data *data = req->data;
770 int i, use_dma, block_size;
771 unsigned sg_len;
772
773 host->data = data;
774 if (data == NULL) {
775 OMAP_MMC_WRITE(host->base, BLEN, 0);
776 OMAP_MMC_WRITE(host->base, NBLK, 0);
777 OMAP_MMC_WRITE(host->base, BUF, 0);
778 host->dma_in_use = 0;
779 set_cmd_timeout(host, req);
780 return;
781 }
782
783
784 block_size = 1 << data->blksz_bits;
785
786 OMAP_MMC_WRITE(host->base, NBLK, data->blocks - 1);
787 OMAP_MMC_WRITE(host->base, BLEN, block_size - 1);
788 set_data_timeout(host, req);
789
790 /* cope with calling layer confusion; it issues "single
791 * block" writes using multi-block scatterlists.
792 */
793 sg_len = (data->blocks == 1) ? 1 : data->sg_len;
794
795 /* Only do DMA for entire blocks */
796 use_dma = host->use_dma;
797 if (use_dma) {
798 for (i = 0; i < sg_len; i++) {
799 if ((data->sg[i].length % block_size) != 0) {
800 use_dma = 0;
801 break;
802 }
803 }
804 }
805
806 host->sg_idx = 0;
807 if (use_dma) {
808 if (mmc_omap_get_dma_channel(host, data) == 0) {
809 enum dma_data_direction dma_data_dir;
810
811 if (data->flags & MMC_DATA_WRITE)
812 dma_data_dir = DMA_TO_DEVICE;
813 else
814 dma_data_dir = DMA_FROM_DEVICE;
815
816 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
817 sg_len, dma_data_dir);
818 host->total_bytes_left = 0;
819 mmc_omap_prepare_dma(host, req->data);
820 host->brs_received = 0;
821 host->dma_done = 0;
822 host->dma_in_use = 1;
823 } else
824 use_dma = 0;
825 }
826
827 /* Revert to PIO? */
828 if (!use_dma) {
829 OMAP_MMC_WRITE(host->base, BUF, 0x1f1f);
830 host->total_bytes_left = data->blocks * block_size;
831 host->sg_len = sg_len;
832 mmc_omap_sg_to_buf(host);
833 host->dma_in_use = 0;
834 }
835}
836
837static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
838{
839 struct mmc_omap_host *host = mmc_priv(mmc);
840
841 WARN_ON(host->mrq != NULL);
842
843 host->mrq = req;
844
845 /* only touch fifo AFTER the controller readies it */
846 mmc_omap_prepare_data(host, req);
847 mmc_omap_start_command(host, req->cmd);
848 if (host->dma_in_use)
849 omap_start_dma(host->dma_ch);
850}
851
852static void innovator_fpga_socket_power(int on)
853{
854#if defined(CONFIG_MACH_OMAP_INNOVATOR) && defined(CONFIG_ARCH_OMAP15XX)
855
856 if (on) {
857 fpga_write(fpga_read(OMAP1510_FPGA_POWER) | (1 << 3),
858 OMAP1510_FPGA_POWER);
859 } else {
860 fpga_write(fpga_read(OMAP1510_FPGA_POWER) & ~(1 << 3),
861 OMAP1510_FPGA_POWER);
862 }
863#endif
864}
865
866/*
867 * Turn the socket power on/off. Innovator uses FPGA, most boards
868 * probably use GPIO.
869 */
870static void mmc_omap_power(struct mmc_omap_host *host, int on)
871{
872 if (on) {
873 if (machine_is_omap_innovator())
874 innovator_fpga_socket_power(1);
875 else if (machine_is_omap_h2())
876 tps65010_set_gpio_out_value(GPIO3, HIGH);
877 else if (machine_is_omap_h3())
878 /* GPIO 4 of TPS65010 sends SD_EN signal */
879 tps65010_set_gpio_out_value(GPIO4, HIGH);
880 else if (cpu_is_omap24xx()) {
881 u16 reg = OMAP_MMC_READ(host->base, CON);
882 OMAP_MMC_WRITE(host->base, CON, reg | (1 << 11));
883 } else
884 if (host->power_pin >= 0)
885 omap_set_gpio_dataout(host->power_pin, 1);
886 } else {
887 if (machine_is_omap_innovator())
888 innovator_fpga_socket_power(0);
889 else if (machine_is_omap_h2())
890 tps65010_set_gpio_out_value(GPIO3, LOW);
891 else if (machine_is_omap_h3())
892 tps65010_set_gpio_out_value(GPIO4, LOW);
893 else if (cpu_is_omap24xx()) {
894 u16 reg = OMAP_MMC_READ(host->base, CON);
895 OMAP_MMC_WRITE(host->base, CON, reg & ~(1 << 11));
896 } else
897 if (host->power_pin >= 0)
898 omap_set_gpio_dataout(host->power_pin, 0);
899 }
900}
901
902static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
903{
904 struct mmc_omap_host *host = mmc_priv(mmc);
905 int dsor;
906 int realclock, i;
907
908 realclock = ios->clock;
909
910 if (ios->clock == 0)
911 dsor = 0;
912 else {
913 int func_clk_rate = clk_get_rate(host->fclk);
914
915 dsor = func_clk_rate / realclock;
916 if (dsor < 1)
917 dsor = 1;
918
919 if (func_clk_rate / dsor > realclock)
920 dsor++;
921
922 if (dsor > 250)
923 dsor = 250;
924 dsor++;
925
926 if (ios->bus_width == MMC_BUS_WIDTH_4)
927 dsor |= 1 << 15;
928 }
929
930 switch (ios->power_mode) {
931 case MMC_POWER_OFF:
932 mmc_omap_power(host, 0);
933 break;
934 case MMC_POWER_UP:
935 case MMC_POWER_ON:
936 mmc_omap_power(host, 1);
937 dsor |= 1<<11;
938 break;
939 }
940
941 host->bus_mode = ios->bus_mode;
942 host->hw_bus_mode = host->bus_mode;
943
944 clk_enable(host->fclk);
945
946 /* On insanely high arm_per frequencies something sometimes
947 * goes somehow out of sync, and the POW bit is not being set,
948 * which results in the while loop below getting stuck.
949 * Writing to the CON register twice seems to do the trick. */
950 for (i = 0; i < 2; i++)
951 OMAP_MMC_WRITE(host->base, CON, dsor);
952 if (ios->power_mode == MMC_POWER_UP) {
953 /* Send clock cycles, poll completion */
954 OMAP_MMC_WRITE(host->base, IE, 0);
955 OMAP_MMC_WRITE(host->base, STAT, 0xffff);
956 OMAP_MMC_WRITE(host->base, CMD, 1<<7);
957 while (0 == (OMAP_MMC_READ(host->base, STAT) & 1));
958 OMAP_MMC_WRITE(host->base, STAT, 1);
959 }
960 clk_disable(host->fclk);
961}
962
963static int mmc_omap_get_ro(struct mmc_host *mmc)
964{
965 struct mmc_omap_host *host = mmc_priv(mmc);
966
967 return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
968}
969
970static struct mmc_host_ops mmc_omap_ops = {
971 .request = mmc_omap_request,
972 .set_ios = mmc_omap_set_ios,
973 .get_ro = mmc_omap_get_ro,
974};
975
976static int __init mmc_omap_probe(struct platform_device *pdev)
977{
978 struct omap_mmc_conf *minfo = pdev->dev.platform_data;
979 struct mmc_host *mmc;
980 struct mmc_omap_host *host = NULL;
981 int ret = 0;
982
983 if (platform_get_resource(pdev, IORESOURCE_MEM, 0) ||
984 platform_get_irq(pdev, IORESOURCE_IRQ, 0)) {
985 dev_err(&pdev->dev, "mmc_omap_probe: invalid resource type\n");
986 return -ENODEV;
987 }
988
989 if (!request_mem_region(pdev->resource[0].start,
990 pdev->resource[0].end - pdev->resource[0].start + 1,
991 pdev->name)) {
992 dev_dbg(&pdev->dev, "request_mem_region failed\n");
993 return -EBUSY;
994 }
995
996 mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev);
997 if (!mmc) {
998 ret = -ENOMEM;
999 goto out;
1000 }
1001
1002 host = mmc_priv(mmc);
1003 host->mmc = mmc;
1004
1005 spin_lock_init(&host->dma_lock);
1006 init_timer(&host->dma_timer);
1007 host->dma_timer.function = mmc_omap_dma_timer;
1008 host->dma_timer.data = (unsigned long) host;
1009
1010 host->id = pdev->id;
1011
1012 if (cpu_is_omap24xx()) {
1013 host->iclk = clk_get(&pdev->dev, "mmc_ick");
1014 if (IS_ERR(host->iclk))
1015 goto out;
1016 clk_enable(host->iclk);
1017 }
1018
1019 if (!cpu_is_omap24xx())
1020 host->fclk = clk_get(&pdev->dev, "mmc_ck");
1021 else
1022 host->fclk = clk_get(&pdev->dev, "mmc_fck");
1023
1024 if (IS_ERR(host->fclk)) {
1025 ret = PTR_ERR(host->fclk);
1026 goto out;
1027 }
1028
1029 /* REVISIT:
1030 * Also, use minfo->cover to decide how to manage
1031 * the card detect sensing.
1032 */
1033 host->power_pin = minfo->power_pin;
1034 host->switch_pin = minfo->switch_pin;
1035 host->wp_pin = minfo->wp_pin;
1036 host->use_dma = 1;
1037 host->dma_ch = -1;
1038
1039 host->irq = pdev->resource[1].start;
1040 host->base = ioremap(pdev->res.start, SZ_4K);
1041 if (!host->base) {
1042 ret = -ENOMEM;
1043 goto out;
1044 }
1045
1046 if (minfo->wire4)
1047 mmc->caps |= MMC_CAP_4_BIT_DATA;
1048
1049 mmc->ops = &mmc_omap_ops;
1050 mmc->f_min = 400000;
1051 mmc->f_max = 24000000;
1052 mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
1053
1054 /* Use scatterlist DMA to reduce per-transfer costs.
1055 * NOTE max_seg_size assumption that small blocks aren't
1056 * normally used (except e.g. for reading SD registers).
1057 */
1058 mmc->max_phys_segs = 32;
1059 mmc->max_hw_segs = 32;
1060 mmc->max_sectors = 256; /* NBLK max 11-bits, OMAP also limited by DMA */
1061 mmc->max_seg_size = mmc->max_sectors * 512;
1062
1063 if (host->power_pin >= 0) {
1064 if ((ret = omap_request_gpio(host->power_pin)) != 0) {
1065 dev_err(mmc_dev(host->mmc), "Unable to get GPIO
1066 pin for MMC power\n");
1067 goto out;
1068 }
1069 omap_set_gpio_direction(host->power_pin, 0);
1070 }
1071
1072 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1073 if (ret)
1074 goto out;
1075
1076 host->dev = &pdev->dev;
1077 platform_set_drvdata(pdev, host);
1078
1079 mmc_add_host(mmc);
1080
1081 if (host->switch_pin >= 0) {
1082 INIT_WORK(&host->switch_work, mmc_omap_switch_handler, host);
1083 init_timer(&host->switch_timer);
1084 host->switch_timer.function = mmc_omap_switch_timer;
1085 host->switch_timer.data = (unsigned long) host;
1086 if (omap_request_gpio(host->switch_pin) != 0) {
1087 dev_warn(mmc_dev(host->mmc), "Unable to get GPIO pin for MMC cover switch\n");
1088 host->switch_pin = -1;
1089 goto no_switch;
1090 }
1091
1092 omap_set_gpio_direction(host->switch_pin, 1);
1093 ret = request_irq(OMAP_GPIO_IRQ(host->switch_pin),
1094 mmc_omap_switch_irq, SA_TRIGGER_RISING, DRIVER_NAME, host);
1095 if (ret) {
1096 dev_warn(mmc_dev(host->mmc), "Unable to get IRQ for MMC cover switch\n");
1097 omap_free_gpio(host->switch_pin);
1098 host->switch_pin = -1;
1099 goto no_switch;
1100 }
1101 ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
1102 if (ret == 0) {
1103 ret = device_create_file(&pdev->dev, &dev_attr_enable_poll);
1104 if (ret != 0)
1105 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1106 }
1107 if (ret) {
1108 dev_wan(mmc_dev(host->mmc), "Unable to create sysfs attributes\n");
1109 free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1110 omap_free_gpio(host->switch_pin);
1111 host->switch_pin = -1;
1112 goto no_switch;
1113 }
1114 if (mmc_omap_enable_poll && mmc_omap_cover_is_open(host))
1115 schedule_work(&host->switch_work);
1116 }
1117
1118no_switch:
1119 return 0;
1120
1121out:
1122 /* FIXME: Free other resources too. */
1123 if (host) {
1124 if (host->iclk && !IS_ERR(host->iclk))
1125 clk_put(host->iclk);
1126 if (host->fclk && !IS_ERR(host->fclk))
1127 clk_put(host->fclk);
1128 mmc_free_host(host->mmc);
1129 }
1130 return ret;
1131}
1132
1133static int mmc_omap_remove(struct platform_device *pdev)
1134{
1135 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1136
1137 platform_set_drvdata(pdev, NULL);
1138
1139 if (host) {
1140 mmc_remove_host(host->mmc);
1141 free_irq(host->irq, host);
1142
1143 if (host->power_pin >= 0)
1144 omap_free_gpio(host->power_pin);
1145 if (host->switch_pin >= 0) {
1146 device_remove_file(&pdev->dev, &dev_attr_enable_poll);
1147 device_remove_file(&pdev->dev, &dev_attr_cover_switch);
1148 free_irq(OMAP_GPIO_IRQ(host->switch_pin), host);
1149 omap_free_gpio(host->switch_pin);
1150 host->switch_pin = -1;
1151 del_timer_sync(&host->switch_timer);
1152 flush_scheduled_work();
1153 }
1154 if (host->iclk && !IS_ERR(host->iclk))
1155 clk_put(host->iclk);
1156 if (host->fclk && !IS_ERR(host->fclk))
1157 clk_put(host->fclk);
1158 mmc_free_host(host->mmc);
1159 }
1160
1161 release_mem_region(pdev->resource[0].start,
1162 pdev->resource[0].end - pdev->resource[0].start + 1);
1163
1164 return 0;
1165}
1166
1167#ifdef CONFIG_PM
1168static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1169{
1170 int ret = 0;
1171 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1172
1173 if (host && host->suspended)
1174 return 0;
1175
1176 if (host) {
1177 ret = mmc_suspend_host(host->mmc, mesg);
1178 if (ret == 0)
1179 host->suspended = 1;
1180 }
1181 return ret;
1182}
1183
1184static int mmc_omap_resume(struct platform_device *pdev)
1185{
1186 int ret = 0;
1187 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1188
1189 if (host && !host->suspended)
1190 return 0;
1191
1192 if (host) {
1193 ret = mmc_resume_host(host->mmc);
1194 if (ret == 0)
1195 host->suspended = 0;
1196 }
1197
1198 return ret;
1199}
1200#else
1201#define mmc_omap_suspend NULL
1202#define mmc_omap_resume NULL
1203#endif
1204
1205static struct platform_driver mmc_omap_driver = {
1206 .probe = mmc_omap_probe,
1207 .remove = mmc_omap_remove,
1208 .suspend = mmc_omap_suspend,
1209 .resume = mmc_omap_resume,
1210 .driver = {
1211 .name = DRIVER_NAME,
1212 },
1213};
1214
1215static int __init mmc_omap_init(void)
1216{
1217 return platform_driver_register(&mmc_omap_driver);
1218}
1219
1220static void __exit mmc_omap_exit(void)
1221{
1222 platform_driver_unregister(&mmc_omap_driver);
1223}
1224
1225module_init(mmc_omap_init);
1226module_exit(mmc_omap_exit);
1227
1228MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1229MODULE_LICENSE("GPL");
1230MODULE_ALIAS(DRIVER_NAME);
1231MODULE_AUTHOR("Juha Yrjölä");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 11:53:08 -0500