Loading...
1/*
2 * linux/drivers/mmc/host/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#include <linux/scatterlist.h>
28#include <linux/i2c/tps65010.h>
29#include <linux/slab.h>
30
31#include <asm/io.h>
32#include <asm/irq.h>
33
34#include <plat/board.h>
35#include <plat/mmc.h>
36#include <mach/gpio.h>
37#include <plat/dma.h>
38#include <plat/mux.h>
39#include <plat/fpga.h>
40
41#define OMAP_MMC_REG_CMD 0x00
42#define OMAP_MMC_REG_ARGL 0x01
43#define OMAP_MMC_REG_ARGH 0x02
44#define OMAP_MMC_REG_CON 0x03
45#define OMAP_MMC_REG_STAT 0x04
46#define OMAP_MMC_REG_IE 0x05
47#define OMAP_MMC_REG_CTO 0x06
48#define OMAP_MMC_REG_DTO 0x07
49#define OMAP_MMC_REG_DATA 0x08
50#define OMAP_MMC_REG_BLEN 0x09
51#define OMAP_MMC_REG_NBLK 0x0a
52#define OMAP_MMC_REG_BUF 0x0b
53#define OMAP_MMC_REG_SDIO 0x0d
54#define OMAP_MMC_REG_REV 0x0f
55#define OMAP_MMC_REG_RSP0 0x10
56#define OMAP_MMC_REG_RSP1 0x11
57#define OMAP_MMC_REG_RSP2 0x12
58#define OMAP_MMC_REG_RSP3 0x13
59#define OMAP_MMC_REG_RSP4 0x14
60#define OMAP_MMC_REG_RSP5 0x15
61#define OMAP_MMC_REG_RSP6 0x16
62#define OMAP_MMC_REG_RSP7 0x17
63#define OMAP_MMC_REG_IOSR 0x18
64#define OMAP_MMC_REG_SYSC 0x19
65#define OMAP_MMC_REG_SYSS 0x1a
66
67#define OMAP_MMC_STAT_CARD_ERR (1 << 14)
68#define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
69#define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
70#define OMAP_MMC_STAT_A_EMPTY (1 << 11)
71#define OMAP_MMC_STAT_A_FULL (1 << 10)
72#define OMAP_MMC_STAT_CMD_CRC (1 << 8)
73#define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
74#define OMAP_MMC_STAT_DATA_CRC (1 << 6)
75#define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
76#define OMAP_MMC_STAT_END_BUSY (1 << 4)
77#define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
78#define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
79#define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
80
81#define OMAP_MMC_REG(host, reg) (OMAP_MMC_REG_##reg << (host)->reg_shift)
82#define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG(host, reg))
83#define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG(host, reg))
84
85/*
86 * Command types
87 */
88#define OMAP_MMC_CMDTYPE_BC 0
89#define OMAP_MMC_CMDTYPE_BCR 1
90#define OMAP_MMC_CMDTYPE_AC 2
91#define OMAP_MMC_CMDTYPE_ADTC 3
92
93
94#define DRIVER_NAME "mmci-omap"
95
96/* Specifies how often in millisecs to poll for card status changes
97 * when the cover switch is open */
98#define OMAP_MMC_COVER_POLL_DELAY 500
99
100struct mmc_omap_host;
101
102struct mmc_omap_slot {
103 int id;
104 unsigned int vdd;
105 u16 saved_con;
106 u16 bus_mode;
107 unsigned int fclk_freq;
108 unsigned powered:1;
109
110 struct tasklet_struct cover_tasklet;
111 struct timer_list cover_timer;
112 unsigned cover_open;
113
114 struct mmc_request *mrq;
115 struct mmc_omap_host *host;
116 struct mmc_host *mmc;
117 struct omap_mmc_slot_data *pdata;
118};
119
120struct mmc_omap_host {
121 int initialized;
122 int suspended;
123 struct mmc_request * mrq;
124 struct mmc_command * cmd;
125 struct mmc_data * data;
126 struct mmc_host * mmc;
127 struct device * dev;
128 unsigned char id; /* 16xx chips have 2 MMC blocks */
129 struct clk * iclk;
130 struct clk * fclk;
131 struct resource *mem_res;
132 void __iomem *virt_base;
133 unsigned int phys_base;
134 int irq;
135 unsigned char bus_mode;
136 unsigned char hw_bus_mode;
137 unsigned int reg_shift;
138
139 struct work_struct cmd_abort_work;
140 unsigned abort:1;
141 struct timer_list cmd_abort_timer;
142
143 struct work_struct slot_release_work;
144 struct mmc_omap_slot *next_slot;
145 struct work_struct send_stop_work;
146 struct mmc_data *stop_data;
147
148 unsigned int sg_len;
149 int sg_idx;
150 u16 * buffer;
151 u32 buffer_bytes_left;
152 u32 total_bytes_left;
153
154 unsigned use_dma:1;
155 unsigned brs_received:1, dma_done:1;
156 unsigned dma_is_read:1;
157 unsigned dma_in_use:1;
158 int dma_ch;
159 spinlock_t dma_lock;
160 struct timer_list dma_timer;
161 unsigned dma_len;
162
163 struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
164 struct mmc_omap_slot *current_slot;
165 spinlock_t slot_lock;
166 wait_queue_head_t slot_wq;
167 int nr_slots;
168
169 struct timer_list clk_timer;
170 spinlock_t clk_lock; /* for changing enabled state */
171 unsigned int fclk_enabled:1;
172
173 struct omap_mmc_platform_data *pdata;
174};
175
176static struct workqueue_struct *mmc_omap_wq;
177
178static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
179{
180 unsigned long tick_ns;
181
182 if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
183 tick_ns = (1000000000 + slot->fclk_freq - 1) / slot->fclk_freq;
184 ndelay(8 * tick_ns);
185 }
186}
187
188static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
189{
190 unsigned long flags;
191
192 spin_lock_irqsave(&host->clk_lock, flags);
193 if (host->fclk_enabled != enable) {
194 host->fclk_enabled = enable;
195 if (enable)
196 clk_enable(host->fclk);
197 else
198 clk_disable(host->fclk);
199 }
200 spin_unlock_irqrestore(&host->clk_lock, flags);
201}
202
203static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
204{
205 struct mmc_omap_host *host = slot->host;
206 unsigned long flags;
207
208 if (claimed)
209 goto no_claim;
210 spin_lock_irqsave(&host->slot_lock, flags);
211 while (host->mmc != NULL) {
212 spin_unlock_irqrestore(&host->slot_lock, flags);
213 wait_event(host->slot_wq, host->mmc == NULL);
214 spin_lock_irqsave(&host->slot_lock, flags);
215 }
216 host->mmc = slot->mmc;
217 spin_unlock_irqrestore(&host->slot_lock, flags);
218no_claim:
219 del_timer(&host->clk_timer);
220 if (host->current_slot != slot || !claimed)
221 mmc_omap_fclk_offdelay(host->current_slot);
222
223 if (host->current_slot != slot) {
224 OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
225 if (host->pdata->switch_slot != NULL)
226 host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
227 host->current_slot = slot;
228 }
229
230 if (claimed) {
231 mmc_omap_fclk_enable(host, 1);
232
233 /* Doing the dummy read here seems to work around some bug
234 * at least in OMAP24xx silicon where the command would not
235 * start after writing the CMD register. Sigh. */
236 OMAP_MMC_READ(host, CON);
237
238 OMAP_MMC_WRITE(host, CON, slot->saved_con);
239 } else
240 mmc_omap_fclk_enable(host, 0);
241}
242
243static void mmc_omap_start_request(struct mmc_omap_host *host,
244 struct mmc_request *req);
245
246static void mmc_omap_slot_release_work(struct work_struct *work)
247{
248 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
249 slot_release_work);
250 struct mmc_omap_slot *next_slot = host->next_slot;
251 struct mmc_request *rq;
252
253 host->next_slot = NULL;
254 mmc_omap_select_slot(next_slot, 1);
255
256 rq = next_slot->mrq;
257 next_slot->mrq = NULL;
258 mmc_omap_start_request(host, rq);
259}
260
261static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
262{
263 struct mmc_omap_host *host = slot->host;
264 unsigned long flags;
265 int i;
266
267 BUG_ON(slot == NULL || host->mmc == NULL);
268
269 if (clk_enabled)
270 /* Keeps clock running for at least 8 cycles on valid freq */
271 mod_timer(&host->clk_timer, jiffies + HZ/10);
272 else {
273 del_timer(&host->clk_timer);
274 mmc_omap_fclk_offdelay(slot);
275 mmc_omap_fclk_enable(host, 0);
276 }
277
278 spin_lock_irqsave(&host->slot_lock, flags);
279 /* Check for any pending requests */
280 for (i = 0; i < host->nr_slots; i++) {
281 struct mmc_omap_slot *new_slot;
282
283 if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
284 continue;
285
286 BUG_ON(host->next_slot != NULL);
287 new_slot = host->slots[i];
288 /* The current slot should not have a request in queue */
289 BUG_ON(new_slot == host->current_slot);
290
291 host->next_slot = new_slot;
292 host->mmc = new_slot->mmc;
293 spin_unlock_irqrestore(&host->slot_lock, flags);
294 queue_work(mmc_omap_wq, &host->slot_release_work);
295 return;
296 }
297
298 host->mmc = NULL;
299 wake_up(&host->slot_wq);
300 spin_unlock_irqrestore(&host->slot_lock, flags);
301}
302
303static inline
304int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
305{
306 if (slot->pdata->get_cover_state)
307 return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
308 slot->id);
309 return 0;
310}
311
312static ssize_t
313mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
314 char *buf)
315{
316 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
317 struct mmc_omap_slot *slot = mmc_priv(mmc);
318
319 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
320 "closed");
321}
322
323static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
324
325static ssize_t
326mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
327 char *buf)
328{
329 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
330 struct mmc_omap_slot *slot = mmc_priv(mmc);
331
332 return sprintf(buf, "%s\n", slot->pdata->name);
333}
334
335static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
336
337static void
338mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
339{
340 u32 cmdreg;
341 u32 resptype;
342 u32 cmdtype;
343
344 host->cmd = cmd;
345
346 resptype = 0;
347 cmdtype = 0;
348
349 /* Our hardware needs to know exact type */
350 switch (mmc_resp_type(cmd)) {
351 case MMC_RSP_NONE:
352 break;
353 case MMC_RSP_R1:
354 case MMC_RSP_R1B:
355 /* resp 1, 1b, 6, 7 */
356 resptype = 1;
357 break;
358 case MMC_RSP_R2:
359 resptype = 2;
360 break;
361 case MMC_RSP_R3:
362 resptype = 3;
363 break;
364 default:
365 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
366 break;
367 }
368
369 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
370 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
371 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
372 cmdtype = OMAP_MMC_CMDTYPE_BC;
373 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
374 cmdtype = OMAP_MMC_CMDTYPE_BCR;
375 } else {
376 cmdtype = OMAP_MMC_CMDTYPE_AC;
377 }
378
379 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
380
381 if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
382 cmdreg |= 1 << 6;
383
384 if (cmd->flags & MMC_RSP_BUSY)
385 cmdreg |= 1 << 11;
386
387 if (host->data && !(host->data->flags & MMC_DATA_WRITE))
388 cmdreg |= 1 << 15;
389
390 mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
391
392 OMAP_MMC_WRITE(host, CTO, 200);
393 OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
394 OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
395 OMAP_MMC_WRITE(host, IE,
396 OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
397 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
398 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
399 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
400 OMAP_MMC_STAT_END_OF_DATA);
401 OMAP_MMC_WRITE(host, CMD, cmdreg);
402}
403
404static void
405mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
406 int abort)
407{
408 enum dma_data_direction dma_data_dir;
409
410 BUG_ON(host->dma_ch < 0);
411 if (data->error)
412 omap_stop_dma(host->dma_ch);
413 /* Release DMA channel lazily */
414 mod_timer(&host->dma_timer, jiffies + HZ);
415 if (data->flags & MMC_DATA_WRITE)
416 dma_data_dir = DMA_TO_DEVICE;
417 else
418 dma_data_dir = DMA_FROM_DEVICE;
419 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
420 dma_data_dir);
421}
422
423static void mmc_omap_send_stop_work(struct work_struct *work)
424{
425 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
426 send_stop_work);
427 struct mmc_omap_slot *slot = host->current_slot;
428 struct mmc_data *data = host->stop_data;
429 unsigned long tick_ns;
430
431 tick_ns = (1000000000 + slot->fclk_freq - 1)/slot->fclk_freq;
432 ndelay(8*tick_ns);
433
434 mmc_omap_start_command(host, data->stop);
435}
436
437static void
438mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
439{
440 if (host->dma_in_use)
441 mmc_omap_release_dma(host, data, data->error);
442
443 host->data = NULL;
444 host->sg_len = 0;
445
446 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
447 * dozens of requests until the card finishes writing data.
448 * It'd be cheaper to just wait till an EOFB interrupt arrives...
449 */
450
451 if (!data->stop) {
452 struct mmc_host *mmc;
453
454 host->mrq = NULL;
455 mmc = host->mmc;
456 mmc_omap_release_slot(host->current_slot, 1);
457 mmc_request_done(mmc, data->mrq);
458 return;
459 }
460
461 host->stop_data = data;
462 queue_work(mmc_omap_wq, &host->send_stop_work);
463}
464
465static void
466mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
467{
468 struct mmc_omap_slot *slot = host->current_slot;
469 unsigned int restarts, passes, timeout;
470 u16 stat = 0;
471
472 /* Sending abort takes 80 clocks. Have some extra and round up */
473 timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
474 restarts = 0;
475 while (restarts < maxloops) {
476 OMAP_MMC_WRITE(host, STAT, 0xFFFF);
477 OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
478
479 passes = 0;
480 while (passes < timeout) {
481 stat = OMAP_MMC_READ(host, STAT);
482 if (stat & OMAP_MMC_STAT_END_OF_CMD)
483 goto out;
484 udelay(1);
485 passes++;
486 }
487
488 restarts++;
489 }
490out:
491 OMAP_MMC_WRITE(host, STAT, stat);
492}
493
494static void
495mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
496{
497 if (host->dma_in_use)
498 mmc_omap_release_dma(host, data, 1);
499
500 host->data = NULL;
501 host->sg_len = 0;
502
503 mmc_omap_send_abort(host, 10000);
504}
505
506static void
507mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
508{
509 unsigned long flags;
510 int done;
511
512 if (!host->dma_in_use) {
513 mmc_omap_xfer_done(host, data);
514 return;
515 }
516 done = 0;
517 spin_lock_irqsave(&host->dma_lock, flags);
518 if (host->dma_done)
519 done = 1;
520 else
521 host->brs_received = 1;
522 spin_unlock_irqrestore(&host->dma_lock, flags);
523 if (done)
524 mmc_omap_xfer_done(host, data);
525}
526
527static void
528mmc_omap_dma_timer(unsigned long data)
529{
530 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
531
532 BUG_ON(host->dma_ch < 0);
533 omap_free_dma(host->dma_ch);
534 host->dma_ch = -1;
535}
536
537static void
538mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
539{
540 unsigned long flags;
541 int done;
542
543 done = 0;
544 spin_lock_irqsave(&host->dma_lock, flags);
545 if (host->brs_received)
546 done = 1;
547 else
548 host->dma_done = 1;
549 spin_unlock_irqrestore(&host->dma_lock, flags);
550 if (done)
551 mmc_omap_xfer_done(host, data);
552}
553
554static void
555mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
556{
557 host->cmd = NULL;
558
559 del_timer(&host->cmd_abort_timer);
560
561 if (cmd->flags & MMC_RSP_PRESENT) {
562 if (cmd->flags & MMC_RSP_136) {
563 /* response type 2 */
564 cmd->resp[3] =
565 OMAP_MMC_READ(host, RSP0) |
566 (OMAP_MMC_READ(host, RSP1) << 16);
567 cmd->resp[2] =
568 OMAP_MMC_READ(host, RSP2) |
569 (OMAP_MMC_READ(host, RSP3) << 16);
570 cmd->resp[1] =
571 OMAP_MMC_READ(host, RSP4) |
572 (OMAP_MMC_READ(host, RSP5) << 16);
573 cmd->resp[0] =
574 OMAP_MMC_READ(host, RSP6) |
575 (OMAP_MMC_READ(host, RSP7) << 16);
576 } else {
577 /* response types 1, 1b, 3, 4, 5, 6 */
578 cmd->resp[0] =
579 OMAP_MMC_READ(host, RSP6) |
580 (OMAP_MMC_READ(host, RSP7) << 16);
581 }
582 }
583
584 if (host->data == NULL || cmd->error) {
585 struct mmc_host *mmc;
586
587 if (host->data != NULL)
588 mmc_omap_abort_xfer(host, host->data);
589 host->mrq = NULL;
590 mmc = host->mmc;
591 mmc_omap_release_slot(host->current_slot, 1);
592 mmc_request_done(mmc, cmd->mrq);
593 }
594}
595
596/*
597 * Abort stuck command. Can occur when card is removed while it is being
598 * read.
599 */
600static void mmc_omap_abort_command(struct work_struct *work)
601{
602 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
603 cmd_abort_work);
604 BUG_ON(!host->cmd);
605
606 dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
607 host->cmd->opcode);
608
609 if (host->cmd->error == 0)
610 host->cmd->error = -ETIMEDOUT;
611
612 if (host->data == NULL) {
613 struct mmc_command *cmd;
614 struct mmc_host *mmc;
615
616 cmd = host->cmd;
617 host->cmd = NULL;
618 mmc_omap_send_abort(host, 10000);
619
620 host->mrq = NULL;
621 mmc = host->mmc;
622 mmc_omap_release_slot(host->current_slot, 1);
623 mmc_request_done(mmc, cmd->mrq);
624 } else
625 mmc_omap_cmd_done(host, host->cmd);
626
627 host->abort = 0;
628 enable_irq(host->irq);
629}
630
631static void
632mmc_omap_cmd_timer(unsigned long data)
633{
634 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
635 unsigned long flags;
636
637 spin_lock_irqsave(&host->slot_lock, flags);
638 if (host->cmd != NULL && !host->abort) {
639 OMAP_MMC_WRITE(host, IE, 0);
640 disable_irq(host->irq);
641 host->abort = 1;
642 queue_work(mmc_omap_wq, &host->cmd_abort_work);
643 }
644 spin_unlock_irqrestore(&host->slot_lock, flags);
645}
646
647/* PIO only */
648static void
649mmc_omap_sg_to_buf(struct mmc_omap_host *host)
650{
651 struct scatterlist *sg;
652
653 sg = host->data->sg + host->sg_idx;
654 host->buffer_bytes_left = sg->length;
655 host->buffer = sg_virt(sg);
656 if (host->buffer_bytes_left > host->total_bytes_left)
657 host->buffer_bytes_left = host->total_bytes_left;
658}
659
660static void
661mmc_omap_clk_timer(unsigned long data)
662{
663 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
664
665 mmc_omap_fclk_enable(host, 0);
666}
667
668/* PIO only */
669static void
670mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
671{
672 int n;
673
674 if (host->buffer_bytes_left == 0) {
675 host->sg_idx++;
676 BUG_ON(host->sg_idx == host->sg_len);
677 mmc_omap_sg_to_buf(host);
678 }
679 n = 64;
680 if (n > host->buffer_bytes_left)
681 n = host->buffer_bytes_left;
682 host->buffer_bytes_left -= n;
683 host->total_bytes_left -= n;
684 host->data->bytes_xfered += n;
685
686 if (write) {
687 __raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA), host->buffer, n);
688 } else {
689 __raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA), host->buffer, n);
690 }
691}
692
693static inline void mmc_omap_report_irq(u16 status)
694{
695 static const char *mmc_omap_status_bits[] = {
696 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
697 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
698 };
699 int i, c = 0;
700
701 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
702 if (status & (1 << i)) {
703 if (c)
704 printk(" ");
705 printk("%s", mmc_omap_status_bits[i]);
706 c++;
707 }
708}
709
710static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
711{
712 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
713 u16 status;
714 int end_command;
715 int end_transfer;
716 int transfer_error, cmd_error;
717
718 if (host->cmd == NULL && host->data == NULL) {
719 status = OMAP_MMC_READ(host, STAT);
720 dev_info(mmc_dev(host->slots[0]->mmc),
721 "Spurious IRQ 0x%04x\n", status);
722 if (status != 0) {
723 OMAP_MMC_WRITE(host, STAT, status);
724 OMAP_MMC_WRITE(host, IE, 0);
725 }
726 return IRQ_HANDLED;
727 }
728
729 end_command = 0;
730 end_transfer = 0;
731 transfer_error = 0;
732 cmd_error = 0;
733
734 while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
735 int cmd;
736
737 OMAP_MMC_WRITE(host, STAT, status);
738 if (host->cmd != NULL)
739 cmd = host->cmd->opcode;
740 else
741 cmd = -1;
742#ifdef CONFIG_MMC_DEBUG
743 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
744 status, cmd);
745 mmc_omap_report_irq(status);
746 printk("\n");
747#endif
748 if (host->total_bytes_left) {
749 if ((status & OMAP_MMC_STAT_A_FULL) ||
750 (status & OMAP_MMC_STAT_END_OF_DATA))
751 mmc_omap_xfer_data(host, 0);
752 if (status & OMAP_MMC_STAT_A_EMPTY)
753 mmc_omap_xfer_data(host, 1);
754 }
755
756 if (status & OMAP_MMC_STAT_END_OF_DATA)
757 end_transfer = 1;
758
759 if (status & OMAP_MMC_STAT_DATA_TOUT) {
760 dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
761 cmd);
762 if (host->data) {
763 host->data->error = -ETIMEDOUT;
764 transfer_error = 1;
765 }
766 }
767
768 if (status & OMAP_MMC_STAT_DATA_CRC) {
769 if (host->data) {
770 host->data->error = -EILSEQ;
771 dev_dbg(mmc_dev(host->mmc),
772 "data CRC error, bytes left %d\n",
773 host->total_bytes_left);
774 transfer_error = 1;
775 } else {
776 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
777 }
778 }
779
780 if (status & OMAP_MMC_STAT_CMD_TOUT) {
781 /* Timeouts are routine with some commands */
782 if (host->cmd) {
783 struct mmc_omap_slot *slot =
784 host->current_slot;
785 if (slot == NULL ||
786 !mmc_omap_cover_is_open(slot))
787 dev_err(mmc_dev(host->mmc),
788 "command timeout (CMD%d)\n",
789 cmd);
790 host->cmd->error = -ETIMEDOUT;
791 end_command = 1;
792 cmd_error = 1;
793 }
794 }
795
796 if (status & OMAP_MMC_STAT_CMD_CRC) {
797 if (host->cmd) {
798 dev_err(mmc_dev(host->mmc),
799 "command CRC error (CMD%d, arg 0x%08x)\n",
800 cmd, host->cmd->arg);
801 host->cmd->error = -EILSEQ;
802 end_command = 1;
803 cmd_error = 1;
804 } else
805 dev_err(mmc_dev(host->mmc),
806 "command CRC error without cmd?\n");
807 }
808
809 if (status & OMAP_MMC_STAT_CARD_ERR) {
810 dev_dbg(mmc_dev(host->mmc),
811 "ignoring card status error (CMD%d)\n",
812 cmd);
813 end_command = 1;
814 }
815
816 /*
817 * NOTE: On 1610 the END_OF_CMD may come too early when
818 * starting a write
819 */
820 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
821 (!(status & OMAP_MMC_STAT_A_EMPTY))) {
822 end_command = 1;
823 }
824 }
825
826 if (cmd_error && host->data) {
827 del_timer(&host->cmd_abort_timer);
828 host->abort = 1;
829 OMAP_MMC_WRITE(host, IE, 0);
830 disable_irq_nosync(host->irq);
831 queue_work(mmc_omap_wq, &host->cmd_abort_work);
832 return IRQ_HANDLED;
833 }
834
835 if (end_command && host->cmd)
836 mmc_omap_cmd_done(host, host->cmd);
837 if (host->data != NULL) {
838 if (transfer_error)
839 mmc_omap_xfer_done(host, host->data);
840 else if (end_transfer)
841 mmc_omap_end_of_data(host, host->data);
842 }
843
844 return IRQ_HANDLED;
845}
846
847void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
848{
849 int cover_open;
850 struct mmc_omap_host *host = dev_get_drvdata(dev);
851 struct mmc_omap_slot *slot = host->slots[num];
852
853 BUG_ON(num >= host->nr_slots);
854
855 /* Other subsystems can call in here before we're initialised. */
856 if (host->nr_slots == 0 || !host->slots[num])
857 return;
858
859 cover_open = mmc_omap_cover_is_open(slot);
860 if (cover_open != slot->cover_open) {
861 slot->cover_open = cover_open;
862 sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
863 }
864
865 tasklet_hi_schedule(&slot->cover_tasklet);
866}
867
868static void mmc_omap_cover_timer(unsigned long arg)
869{
870 struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
871 tasklet_schedule(&slot->cover_tasklet);
872}
873
874static void mmc_omap_cover_handler(unsigned long param)
875{
876 struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
877 int cover_open = mmc_omap_cover_is_open(slot);
878
879 mmc_detect_change(slot->mmc, 0);
880 if (!cover_open)
881 return;
882
883 /*
884 * If no card is inserted, we postpone polling until
885 * the cover has been closed.
886 */
887 if (slot->mmc->card == NULL || !mmc_card_present(slot->mmc->card))
888 return;
889
890 mod_timer(&slot->cover_timer,
891 jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
892}
893
894/* Prepare to transfer the next segment of a scatterlist */
895static void
896mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
897{
898 int dma_ch = host->dma_ch;
899 unsigned long data_addr;
900 u16 buf, frame;
901 u32 count;
902 struct scatterlist *sg = &data->sg[host->sg_idx];
903 int src_port = 0;
904 int dst_port = 0;
905 int sync_dev = 0;
906
907 data_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
908 frame = data->blksz;
909 count = sg_dma_len(sg);
910
911 if ((data->blocks == 1) && (count > data->blksz))
912 count = frame;
913
914 host->dma_len = count;
915
916 /* FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx and 24xx.
917 * Use 16 or 32 word frames when the blocksize is at least that large.
918 * Blocksize is usually 512 bytes; but not for some SD reads.
919 */
920 if (cpu_is_omap15xx() && frame > 32)
921 frame = 32;
922 else if (frame > 64)
923 frame = 64;
924 count /= frame;
925 frame >>= 1;
926
927 if (!(data->flags & MMC_DATA_WRITE)) {
928 buf = 0x800f | ((frame - 1) << 8);
929
930 if (cpu_class_is_omap1()) {
931 src_port = OMAP_DMA_PORT_TIPB;
932 dst_port = OMAP_DMA_PORT_EMIFF;
933 }
934 if (cpu_is_omap24xx())
935 sync_dev = OMAP24XX_DMA_MMC1_RX;
936
937 omap_set_dma_src_params(dma_ch, src_port,
938 OMAP_DMA_AMODE_CONSTANT,
939 data_addr, 0, 0);
940 omap_set_dma_dest_params(dma_ch, dst_port,
941 OMAP_DMA_AMODE_POST_INC,
942 sg_dma_address(sg), 0, 0);
943 omap_set_dma_dest_data_pack(dma_ch, 1);
944 omap_set_dma_dest_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
945 } else {
946 buf = 0x0f80 | ((frame - 1) << 0);
947
948 if (cpu_class_is_omap1()) {
949 src_port = OMAP_DMA_PORT_EMIFF;
950 dst_port = OMAP_DMA_PORT_TIPB;
951 }
952 if (cpu_is_omap24xx())
953 sync_dev = OMAP24XX_DMA_MMC1_TX;
954
955 omap_set_dma_dest_params(dma_ch, dst_port,
956 OMAP_DMA_AMODE_CONSTANT,
957 data_addr, 0, 0);
958 omap_set_dma_src_params(dma_ch, src_port,
959 OMAP_DMA_AMODE_POST_INC,
960 sg_dma_address(sg), 0, 0);
961 omap_set_dma_src_data_pack(dma_ch, 1);
962 omap_set_dma_src_burst_mode(dma_ch, OMAP_DMA_DATA_BURST_4);
963 }
964
965 /* Max limit for DMA frame count is 0xffff */
966 BUG_ON(count > 0xffff);
967
968 OMAP_MMC_WRITE(host, BUF, buf);
969 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S16,
970 frame, count, OMAP_DMA_SYNC_FRAME,
971 sync_dev, 0);
972}
973
974/* A scatterlist segment completed */
975static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data)
976{
977 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
978 struct mmc_data *mmcdat = host->data;
979
980 if (unlikely(host->dma_ch < 0)) {
981 dev_err(mmc_dev(host->mmc),
982 "DMA callback while DMA not enabled\n");
983 return;
984 }
985 /* FIXME: We really should do something to _handle_ the errors */
986 if (ch_status & OMAP1_DMA_TOUT_IRQ) {
987 dev_err(mmc_dev(host->mmc),"DMA timeout\n");
988 return;
989 }
990 if (ch_status & OMAP_DMA_DROP_IRQ) {
991 dev_err(mmc_dev(host->mmc), "DMA sync error\n");
992 return;
993 }
994 if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
995 return;
996 }
997 mmcdat->bytes_xfered += host->dma_len;
998 host->sg_idx++;
999 if (host->sg_idx < host->sg_len) {
1000 mmc_omap_prepare_dma(host, host->data);
1001 omap_start_dma(host->dma_ch);
1002 } else
1003 mmc_omap_dma_done(host, host->data);
1004}
1005
1006static int mmc_omap_get_dma_channel(struct mmc_omap_host *host, struct mmc_data *data)
1007{
1008 const char *dma_dev_name;
1009 int sync_dev, dma_ch, is_read, r;
1010
1011 is_read = !(data->flags & MMC_DATA_WRITE);
1012 del_timer_sync(&host->dma_timer);
1013 if (host->dma_ch >= 0) {
1014 if (is_read == host->dma_is_read)
1015 return 0;
1016 omap_free_dma(host->dma_ch);
1017 host->dma_ch = -1;
1018 }
1019
1020 if (is_read) {
1021 if (host->id == 0) {
1022 sync_dev = OMAP_DMA_MMC_RX;
1023 dma_dev_name = "MMC1 read";
1024 } else {
1025 sync_dev = OMAP_DMA_MMC2_RX;
1026 dma_dev_name = "MMC2 read";
1027 }
1028 } else {
1029 if (host->id == 0) {
1030 sync_dev = OMAP_DMA_MMC_TX;
1031 dma_dev_name = "MMC1 write";
1032 } else {
1033 sync_dev = OMAP_DMA_MMC2_TX;
1034 dma_dev_name = "MMC2 write";
1035 }
1036 }
1037 r = omap_request_dma(sync_dev, dma_dev_name, mmc_omap_dma_cb,
1038 host, &dma_ch);
1039 if (r != 0) {
1040 dev_dbg(mmc_dev(host->mmc), "omap_request_dma() failed with %d\n", r);
1041 return r;
1042 }
1043 host->dma_ch = dma_ch;
1044 host->dma_is_read = is_read;
1045
1046 return 0;
1047}
1048
1049static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
1050{
1051 u16 reg;
1052
1053 reg = OMAP_MMC_READ(host, SDIO);
1054 reg &= ~(1 << 5);
1055 OMAP_MMC_WRITE(host, SDIO, reg);
1056 /* Set maximum timeout */
1057 OMAP_MMC_WRITE(host, CTO, 0xff);
1058}
1059
1060static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
1061{
1062 unsigned int timeout, cycle_ns;
1063 u16 reg;
1064
1065 cycle_ns = 1000000000 / host->current_slot->fclk_freq;
1066 timeout = req->data->timeout_ns / cycle_ns;
1067 timeout += req->data->timeout_clks;
1068
1069 /* Check if we need to use timeout multiplier register */
1070 reg = OMAP_MMC_READ(host, SDIO);
1071 if (timeout > 0xffff) {
1072 reg |= (1 << 5);
1073 timeout /= 1024;
1074 } else
1075 reg &= ~(1 << 5);
1076 OMAP_MMC_WRITE(host, SDIO, reg);
1077 OMAP_MMC_WRITE(host, DTO, timeout);
1078}
1079
1080static void
1081mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
1082{
1083 struct mmc_data *data = req->data;
1084 int i, use_dma, block_size;
1085 unsigned sg_len;
1086
1087 host->data = data;
1088 if (data == NULL) {
1089 OMAP_MMC_WRITE(host, BLEN, 0);
1090 OMAP_MMC_WRITE(host, NBLK, 0);
1091 OMAP_MMC_WRITE(host, BUF, 0);
1092 host->dma_in_use = 0;
1093 set_cmd_timeout(host, req);
1094 return;
1095 }
1096
1097 block_size = data->blksz;
1098
1099 OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
1100 OMAP_MMC_WRITE(host, BLEN, block_size - 1);
1101 set_data_timeout(host, req);
1102
1103 /* cope with calling layer confusion; it issues "single
1104 * block" writes using multi-block scatterlists.
1105 */
1106 sg_len = (data->blocks == 1) ? 1 : data->sg_len;
1107
1108 /* Only do DMA for entire blocks */
1109 use_dma = host->use_dma;
1110 if (use_dma) {
1111 for (i = 0; i < sg_len; i++) {
1112 if ((data->sg[i].length % block_size) != 0) {
1113 use_dma = 0;
1114 break;
1115 }
1116 }
1117 }
1118
1119 host->sg_idx = 0;
1120 if (use_dma) {
1121 if (mmc_omap_get_dma_channel(host, data) == 0) {
1122 enum dma_data_direction dma_data_dir;
1123
1124 if (data->flags & MMC_DATA_WRITE)
1125 dma_data_dir = DMA_TO_DEVICE;
1126 else
1127 dma_data_dir = DMA_FROM_DEVICE;
1128
1129 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1130 sg_len, dma_data_dir);
1131 host->total_bytes_left = 0;
1132 mmc_omap_prepare_dma(host, req->data);
1133 host->brs_received = 0;
1134 host->dma_done = 0;
1135 host->dma_in_use = 1;
1136 } else
1137 use_dma = 0;
1138 }
1139
1140 /* Revert to PIO? */
1141 if (!use_dma) {
1142 OMAP_MMC_WRITE(host, BUF, 0x1f1f);
1143 host->total_bytes_left = data->blocks * block_size;
1144 host->sg_len = sg_len;
1145 mmc_omap_sg_to_buf(host);
1146 host->dma_in_use = 0;
1147 }
1148}
1149
1150static void mmc_omap_start_request(struct mmc_omap_host *host,
1151 struct mmc_request *req)
1152{
1153 BUG_ON(host->mrq != NULL);
1154
1155 host->mrq = req;
1156
1157 /* only touch fifo AFTER the controller readies it */
1158 mmc_omap_prepare_data(host, req);
1159 mmc_omap_start_command(host, req->cmd);
1160 if (host->dma_in_use)
1161 omap_start_dma(host->dma_ch);
1162}
1163
1164static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
1165{
1166 struct mmc_omap_slot *slot = mmc_priv(mmc);
1167 struct mmc_omap_host *host = slot->host;
1168 unsigned long flags;
1169
1170 spin_lock_irqsave(&host->slot_lock, flags);
1171 if (host->mmc != NULL) {
1172 BUG_ON(slot->mrq != NULL);
1173 slot->mrq = req;
1174 spin_unlock_irqrestore(&host->slot_lock, flags);
1175 return;
1176 } else
1177 host->mmc = mmc;
1178 spin_unlock_irqrestore(&host->slot_lock, flags);
1179 mmc_omap_select_slot(slot, 1);
1180 mmc_omap_start_request(host, req);
1181}
1182
1183static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
1184 int vdd)
1185{
1186 struct mmc_omap_host *host;
1187
1188 host = slot->host;
1189
1190 if (slot->pdata->set_power != NULL)
1191 slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
1192 vdd);
1193
1194 if (cpu_is_omap24xx()) {
1195 u16 w;
1196
1197 if (power_on) {
1198 w = OMAP_MMC_READ(host, CON);
1199 OMAP_MMC_WRITE(host, CON, w | (1 << 11));
1200 } else {
1201 w = OMAP_MMC_READ(host, CON);
1202 OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
1203 }
1204 }
1205}
1206
1207static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
1208{
1209 struct mmc_omap_slot *slot = mmc_priv(mmc);
1210 struct mmc_omap_host *host = slot->host;
1211 int func_clk_rate = clk_get_rate(host->fclk);
1212 int dsor;
1213
1214 if (ios->clock == 0)
1215 return 0;
1216
1217 dsor = func_clk_rate / ios->clock;
1218 if (dsor < 1)
1219 dsor = 1;
1220
1221 if (func_clk_rate / dsor > ios->clock)
1222 dsor++;
1223
1224 if (dsor > 250)
1225 dsor = 250;
1226
1227 slot->fclk_freq = func_clk_rate / dsor;
1228
1229 if (ios->bus_width == MMC_BUS_WIDTH_4)
1230 dsor |= 1 << 15;
1231
1232 return dsor;
1233}
1234
1235static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1236{
1237 struct mmc_omap_slot *slot = mmc_priv(mmc);
1238 struct mmc_omap_host *host = slot->host;
1239 int i, dsor;
1240 int clk_enabled;
1241
1242 mmc_omap_select_slot(slot, 0);
1243
1244 dsor = mmc_omap_calc_divisor(mmc, ios);
1245
1246 if (ios->vdd != slot->vdd)
1247 slot->vdd = ios->vdd;
1248
1249 clk_enabled = 0;
1250 switch (ios->power_mode) {
1251 case MMC_POWER_OFF:
1252 mmc_omap_set_power(slot, 0, ios->vdd);
1253 break;
1254 case MMC_POWER_UP:
1255 /* Cannot touch dsor yet, just power up MMC */
1256 mmc_omap_set_power(slot, 1, ios->vdd);
1257 goto exit;
1258 case MMC_POWER_ON:
1259 mmc_omap_fclk_enable(host, 1);
1260 clk_enabled = 1;
1261 dsor |= 1 << 11;
1262 break;
1263 }
1264
1265 if (slot->bus_mode != ios->bus_mode) {
1266 if (slot->pdata->set_bus_mode != NULL)
1267 slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
1268 ios->bus_mode);
1269 slot->bus_mode = ios->bus_mode;
1270 }
1271
1272 /* On insanely high arm_per frequencies something sometimes
1273 * goes somehow out of sync, and the POW bit is not being set,
1274 * which results in the while loop below getting stuck.
1275 * Writing to the CON register twice seems to do the trick. */
1276 for (i = 0; i < 2; i++)
1277 OMAP_MMC_WRITE(host, CON, dsor);
1278 slot->saved_con = dsor;
1279 if (ios->power_mode == MMC_POWER_ON) {
1280 /* worst case at 400kHz, 80 cycles makes 200 microsecs */
1281 int usecs = 250;
1282
1283 /* Send clock cycles, poll completion */
1284 OMAP_MMC_WRITE(host, IE, 0);
1285 OMAP_MMC_WRITE(host, STAT, 0xffff);
1286 OMAP_MMC_WRITE(host, CMD, 1 << 7);
1287 while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
1288 udelay(1);
1289 usecs--;
1290 }
1291 OMAP_MMC_WRITE(host, STAT, 1);
1292 }
1293
1294exit:
1295 mmc_omap_release_slot(slot, clk_enabled);
1296}
1297
1298static const struct mmc_host_ops mmc_omap_ops = {
1299 .request = mmc_omap_request,
1300 .set_ios = mmc_omap_set_ios,
1301};
1302
1303static int __init mmc_omap_new_slot(struct mmc_omap_host *host, int id)
1304{
1305 struct mmc_omap_slot *slot = NULL;
1306 struct mmc_host *mmc;
1307 int r;
1308
1309 mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
1310 if (mmc == NULL)
1311 return -ENOMEM;
1312
1313 slot = mmc_priv(mmc);
1314 slot->host = host;
1315 slot->mmc = mmc;
1316 slot->id = id;
1317 slot->pdata = &host->pdata->slots[id];
1318
1319 host->slots[id] = slot;
1320
1321 mmc->caps = 0;
1322 if (host->pdata->slots[id].wires >= 4)
1323 mmc->caps |= MMC_CAP_4_BIT_DATA;
1324
1325 mmc->ops = &mmc_omap_ops;
1326 mmc->f_min = 400000;
1327
1328 if (cpu_class_is_omap2())
1329 mmc->f_max = 48000000;
1330 else
1331 mmc->f_max = 24000000;
1332 if (host->pdata->max_freq)
1333 mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
1334 mmc->ocr_avail = slot->pdata->ocr_mask;
1335
1336 /* Use scatterlist DMA to reduce per-transfer costs.
1337 * NOTE max_seg_size assumption that small blocks aren't
1338 * normally used (except e.g. for reading SD registers).
1339 */
1340 mmc->max_segs = 32;
1341 mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
1342 mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
1343 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1344 mmc->max_seg_size = mmc->max_req_size;
1345
1346 r = mmc_add_host(mmc);
1347 if (r < 0)
1348 goto err_remove_host;
1349
1350 if (slot->pdata->name != NULL) {
1351 r = device_create_file(&mmc->class_dev,
1352 &dev_attr_slot_name);
1353 if (r < 0)
1354 goto err_remove_host;
1355 }
1356
1357 if (slot->pdata->get_cover_state != NULL) {
1358 r = device_create_file(&mmc->class_dev,
1359 &dev_attr_cover_switch);
1360 if (r < 0)
1361 goto err_remove_slot_name;
1362
1363 setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
1364 (unsigned long)slot);
1365 tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
1366 (unsigned long)slot);
1367 tasklet_schedule(&slot->cover_tasklet);
1368 }
1369
1370 return 0;
1371
1372err_remove_slot_name:
1373 if (slot->pdata->name != NULL)
1374 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1375err_remove_host:
1376 mmc_remove_host(mmc);
1377 mmc_free_host(mmc);
1378 return r;
1379}
1380
1381static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
1382{
1383 struct mmc_host *mmc = slot->mmc;
1384
1385 if (slot->pdata->name != NULL)
1386 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1387 if (slot->pdata->get_cover_state != NULL)
1388 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1389
1390 tasklet_kill(&slot->cover_tasklet);
1391 del_timer_sync(&slot->cover_timer);
1392 flush_workqueue(mmc_omap_wq);
1393
1394 mmc_remove_host(mmc);
1395 mmc_free_host(mmc);
1396}
1397
1398static int __init mmc_omap_probe(struct platform_device *pdev)
1399{
1400 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1401 struct mmc_omap_host *host = NULL;
1402 struct resource *res;
1403 int i, ret = 0;
1404 int irq;
1405
1406 if (pdata == NULL) {
1407 dev_err(&pdev->dev, "platform data missing\n");
1408 return -ENXIO;
1409 }
1410 if (pdata->nr_slots == 0) {
1411 dev_err(&pdev->dev, "no slots\n");
1412 return -ENXIO;
1413 }
1414
1415 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1416 irq = platform_get_irq(pdev, 0);
1417 if (res == NULL || irq < 0)
1418 return -ENXIO;
1419
1420 res = request_mem_region(res->start, resource_size(res),
1421 pdev->name);
1422 if (res == NULL)
1423 return -EBUSY;
1424
1425 host = kzalloc(sizeof(struct mmc_omap_host), GFP_KERNEL);
1426 if (host == NULL) {
1427 ret = -ENOMEM;
1428 goto err_free_mem_region;
1429 }
1430
1431 INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
1432 INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
1433
1434 INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
1435 setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
1436 (unsigned long) host);
1437
1438 spin_lock_init(&host->clk_lock);
1439 setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
1440
1441 spin_lock_init(&host->dma_lock);
1442 setup_timer(&host->dma_timer, mmc_omap_dma_timer, (unsigned long) host);
1443 spin_lock_init(&host->slot_lock);
1444 init_waitqueue_head(&host->slot_wq);
1445
1446 host->pdata = pdata;
1447 host->dev = &pdev->dev;
1448 platform_set_drvdata(pdev, host);
1449
1450 host->id = pdev->id;
1451 host->mem_res = res;
1452 host->irq = irq;
1453
1454 host->use_dma = 1;
1455 host->dev->dma_mask = &pdata->dma_mask;
1456 host->dma_ch = -1;
1457
1458 host->irq = irq;
1459 host->phys_base = host->mem_res->start;
1460 host->virt_base = ioremap(res->start, resource_size(res));
1461 if (!host->virt_base)
1462 goto err_ioremap;
1463
1464 host->iclk = clk_get(&pdev->dev, "ick");
1465 if (IS_ERR(host->iclk)) {
1466 ret = PTR_ERR(host->iclk);
1467 goto err_free_mmc_host;
1468 }
1469 clk_enable(host->iclk);
1470
1471 host->fclk = clk_get(&pdev->dev, "fck");
1472 if (IS_ERR(host->fclk)) {
1473 ret = PTR_ERR(host->fclk);
1474 goto err_free_iclk;
1475 }
1476
1477 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1478 if (ret)
1479 goto err_free_fclk;
1480
1481 if (pdata->init != NULL) {
1482 ret = pdata->init(&pdev->dev);
1483 if (ret < 0)
1484 goto err_free_irq;
1485 }
1486
1487 host->nr_slots = pdata->nr_slots;
1488 for (i = 0; i < pdata->nr_slots; i++) {
1489 ret = mmc_omap_new_slot(host, i);
1490 if (ret < 0) {
1491 while (--i >= 0)
1492 mmc_omap_remove_slot(host->slots[i]);
1493
1494 goto err_plat_cleanup;
1495 }
1496 }
1497
1498 host->reg_shift = (cpu_is_omap7xx() ? 1 : 2);
1499
1500 return 0;
1501
1502err_plat_cleanup:
1503 if (pdata->cleanup)
1504 pdata->cleanup(&pdev->dev);
1505err_free_irq:
1506 free_irq(host->irq, host);
1507err_free_fclk:
1508 clk_put(host->fclk);
1509err_free_iclk:
1510 clk_disable(host->iclk);
1511 clk_put(host->iclk);
1512err_free_mmc_host:
1513 iounmap(host->virt_base);
1514err_ioremap:
1515 kfree(host);
1516err_free_mem_region:
1517 release_mem_region(res->start, resource_size(res));
1518 return ret;
1519}
1520
1521static int mmc_omap_remove(struct platform_device *pdev)
1522{
1523 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1524 int i;
1525
1526 platform_set_drvdata(pdev, NULL);
1527
1528 BUG_ON(host == NULL);
1529
1530 for (i = 0; i < host->nr_slots; i++)
1531 mmc_omap_remove_slot(host->slots[i]);
1532
1533 if (host->pdata->cleanup)
1534 host->pdata->cleanup(&pdev->dev);
1535
1536 mmc_omap_fclk_enable(host, 0);
1537 free_irq(host->irq, host);
1538 clk_put(host->fclk);
1539 clk_disable(host->iclk);
1540 clk_put(host->iclk);
1541
1542 iounmap(host->virt_base);
1543 release_mem_region(pdev->resource[0].start,
1544 pdev->resource[0].end - pdev->resource[0].start + 1);
1545
1546 kfree(host);
1547
1548 return 0;
1549}
1550
1551#ifdef CONFIG_PM
1552static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1553{
1554 int i, ret = 0;
1555 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1556
1557 if (host == NULL || host->suspended)
1558 return 0;
1559
1560 for (i = 0; i < host->nr_slots; i++) {
1561 struct mmc_omap_slot *slot;
1562
1563 slot = host->slots[i];
1564 ret = mmc_suspend_host(slot->mmc);
1565 if (ret < 0) {
1566 while (--i >= 0) {
1567 slot = host->slots[i];
1568 mmc_resume_host(slot->mmc);
1569 }
1570 return ret;
1571 }
1572 }
1573 host->suspended = 1;
1574 return 0;
1575}
1576
1577static int mmc_omap_resume(struct platform_device *pdev)
1578{
1579 int i, ret = 0;
1580 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1581
1582 if (host == NULL || !host->suspended)
1583 return 0;
1584
1585 for (i = 0; i < host->nr_slots; i++) {
1586 struct mmc_omap_slot *slot;
1587 slot = host->slots[i];
1588 ret = mmc_resume_host(slot->mmc);
1589 if (ret < 0)
1590 return ret;
1591
1592 host->suspended = 0;
1593 }
1594 return 0;
1595}
1596#else
1597#define mmc_omap_suspend NULL
1598#define mmc_omap_resume NULL
1599#endif
1600
1601static struct platform_driver mmc_omap_driver = {
1602 .remove = mmc_omap_remove,
1603 .suspend = mmc_omap_suspend,
1604 .resume = mmc_omap_resume,
1605 .driver = {
1606 .name = DRIVER_NAME,
1607 .owner = THIS_MODULE,
1608 },
1609};
1610
1611static int __init mmc_omap_init(void)
1612{
1613 int ret;
1614
1615 mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
1616 if (!mmc_omap_wq)
1617 return -ENOMEM;
1618
1619 ret = platform_driver_probe(&mmc_omap_driver, mmc_omap_probe);
1620 if (ret)
1621 destroy_workqueue(mmc_omap_wq);
1622 return ret;
1623}
1624
1625static void __exit mmc_omap_exit(void)
1626{
1627 platform_driver_unregister(&mmc_omap_driver);
1628 destroy_workqueue(mmc_omap_wq);
1629}
1630
1631module_init(mmc_omap_init);
1632module_exit(mmc_omap_exit);
1633
1634MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1635MODULE_LICENSE("GPL");
1636MODULE_ALIAS("platform:" DRIVER_NAME);
1637MODULE_AUTHOR("Juha Yrjölä");
1/*
2 * linux/drivers/mmc/host/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/dmaengine.h>
21#include <linux/dma-mapping.h>
22#include <linux/delay.h>
23#include <linux/spinlock.h>
24#include <linux/timer.h>
25#include <linux/of.h>
26#include <linux/omap-dma.h>
27#include <linux/mmc/host.h>
28#include <linux/mmc/card.h>
29#include <linux/mmc/mmc.h>
30#include <linux/clk.h>
31#include <linux/scatterlist.h>
32#include <linux/slab.h>
33#include <linux/platform_data/mmc-omap.h>
34
35
36#define OMAP_MMC_REG_CMD 0x00
37#define OMAP_MMC_REG_ARGL 0x01
38#define OMAP_MMC_REG_ARGH 0x02
39#define OMAP_MMC_REG_CON 0x03
40#define OMAP_MMC_REG_STAT 0x04
41#define OMAP_MMC_REG_IE 0x05
42#define OMAP_MMC_REG_CTO 0x06
43#define OMAP_MMC_REG_DTO 0x07
44#define OMAP_MMC_REG_DATA 0x08
45#define OMAP_MMC_REG_BLEN 0x09
46#define OMAP_MMC_REG_NBLK 0x0a
47#define OMAP_MMC_REG_BUF 0x0b
48#define OMAP_MMC_REG_SDIO 0x0d
49#define OMAP_MMC_REG_REV 0x0f
50#define OMAP_MMC_REG_RSP0 0x10
51#define OMAP_MMC_REG_RSP1 0x11
52#define OMAP_MMC_REG_RSP2 0x12
53#define OMAP_MMC_REG_RSP3 0x13
54#define OMAP_MMC_REG_RSP4 0x14
55#define OMAP_MMC_REG_RSP5 0x15
56#define OMAP_MMC_REG_RSP6 0x16
57#define OMAP_MMC_REG_RSP7 0x17
58#define OMAP_MMC_REG_IOSR 0x18
59#define OMAP_MMC_REG_SYSC 0x19
60#define OMAP_MMC_REG_SYSS 0x1a
61
62#define OMAP_MMC_STAT_CARD_ERR (1 << 14)
63#define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
64#define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
65#define OMAP_MMC_STAT_A_EMPTY (1 << 11)
66#define OMAP_MMC_STAT_A_FULL (1 << 10)
67#define OMAP_MMC_STAT_CMD_CRC (1 << 8)
68#define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
69#define OMAP_MMC_STAT_DATA_CRC (1 << 6)
70#define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
71#define OMAP_MMC_STAT_END_BUSY (1 << 4)
72#define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
73#define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
74#define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
75
76#define mmc_omap7xx() (host->features & MMC_OMAP7XX)
77#define mmc_omap15xx() (host->features & MMC_OMAP15XX)
78#define mmc_omap16xx() (host->features & MMC_OMAP16XX)
79#define MMC_OMAP1_MASK (MMC_OMAP7XX | MMC_OMAP15XX | MMC_OMAP16XX)
80#define mmc_omap1() (host->features & MMC_OMAP1_MASK)
81#define mmc_omap2() (!mmc_omap1())
82
83#define OMAP_MMC_REG(host, reg) (OMAP_MMC_REG_##reg << (host)->reg_shift)
84#define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG(host, reg))
85#define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG(host, reg))
86
87/*
88 * Command types
89 */
90#define OMAP_MMC_CMDTYPE_BC 0
91#define OMAP_MMC_CMDTYPE_BCR 1
92#define OMAP_MMC_CMDTYPE_AC 2
93#define OMAP_MMC_CMDTYPE_ADTC 3
94
95#define DRIVER_NAME "mmci-omap"
96
97/* Specifies how often in millisecs to poll for card status changes
98 * when the cover switch is open */
99#define OMAP_MMC_COVER_POLL_DELAY 500
100
101struct mmc_omap_host;
102
103struct mmc_omap_slot {
104 int id;
105 unsigned int vdd;
106 u16 saved_con;
107 u16 bus_mode;
108 unsigned int fclk_freq;
109
110 struct tasklet_struct cover_tasklet;
111 struct timer_list cover_timer;
112 unsigned cover_open;
113
114 struct mmc_request *mrq;
115 struct mmc_omap_host *host;
116 struct mmc_host *mmc;
117 struct omap_mmc_slot_data *pdata;
118};
119
120struct mmc_omap_host {
121 int initialized;
122 struct mmc_request * mrq;
123 struct mmc_command * cmd;
124 struct mmc_data * data;
125 struct mmc_host * mmc;
126 struct device * dev;
127 unsigned char id; /* 16xx chips have 2 MMC blocks */
128 struct clk * iclk;
129 struct clk * fclk;
130 struct dma_chan *dma_rx;
131 u32 dma_rx_burst;
132 struct dma_chan *dma_tx;
133 u32 dma_tx_burst;
134 void __iomem *virt_base;
135 unsigned int phys_base;
136 int irq;
137 unsigned char bus_mode;
138 unsigned int reg_shift;
139
140 struct work_struct cmd_abort_work;
141 unsigned abort:1;
142 struct timer_list cmd_abort_timer;
143
144 struct work_struct slot_release_work;
145 struct mmc_omap_slot *next_slot;
146 struct work_struct send_stop_work;
147 struct mmc_data *stop_data;
148
149 unsigned int sg_len;
150 int sg_idx;
151 u16 * buffer;
152 u32 buffer_bytes_left;
153 u32 total_bytes_left;
154
155 unsigned features;
156 unsigned brs_received:1, dma_done:1;
157 unsigned dma_in_use:1;
158 spinlock_t dma_lock;
159
160 struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
161 struct mmc_omap_slot *current_slot;
162 spinlock_t slot_lock;
163 wait_queue_head_t slot_wq;
164 int nr_slots;
165
166 struct timer_list clk_timer;
167 spinlock_t clk_lock; /* for changing enabled state */
168 unsigned int fclk_enabled:1;
169 struct workqueue_struct *mmc_omap_wq;
170
171 struct omap_mmc_platform_data *pdata;
172};
173
174
175static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
176{
177 unsigned long tick_ns;
178
179 if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
180 tick_ns = (1000000000 + slot->fclk_freq - 1) / slot->fclk_freq;
181 ndelay(8 * tick_ns);
182 }
183}
184
185static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
186{
187 unsigned long flags;
188
189 spin_lock_irqsave(&host->clk_lock, flags);
190 if (host->fclk_enabled != enable) {
191 host->fclk_enabled = enable;
192 if (enable)
193 clk_enable(host->fclk);
194 else
195 clk_disable(host->fclk);
196 }
197 spin_unlock_irqrestore(&host->clk_lock, flags);
198}
199
200static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
201{
202 struct mmc_omap_host *host = slot->host;
203 unsigned long flags;
204
205 if (claimed)
206 goto no_claim;
207 spin_lock_irqsave(&host->slot_lock, flags);
208 while (host->mmc != NULL) {
209 spin_unlock_irqrestore(&host->slot_lock, flags);
210 wait_event(host->slot_wq, host->mmc == NULL);
211 spin_lock_irqsave(&host->slot_lock, flags);
212 }
213 host->mmc = slot->mmc;
214 spin_unlock_irqrestore(&host->slot_lock, flags);
215no_claim:
216 del_timer(&host->clk_timer);
217 if (host->current_slot != slot || !claimed)
218 mmc_omap_fclk_offdelay(host->current_slot);
219
220 if (host->current_slot != slot) {
221 OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
222 if (host->pdata->switch_slot != NULL)
223 host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
224 host->current_slot = slot;
225 }
226
227 if (claimed) {
228 mmc_omap_fclk_enable(host, 1);
229
230 /* Doing the dummy read here seems to work around some bug
231 * at least in OMAP24xx silicon where the command would not
232 * start after writing the CMD register. Sigh. */
233 OMAP_MMC_READ(host, CON);
234
235 OMAP_MMC_WRITE(host, CON, slot->saved_con);
236 } else
237 mmc_omap_fclk_enable(host, 0);
238}
239
240static void mmc_omap_start_request(struct mmc_omap_host *host,
241 struct mmc_request *req);
242
243static void mmc_omap_slot_release_work(struct work_struct *work)
244{
245 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
246 slot_release_work);
247 struct mmc_omap_slot *next_slot = host->next_slot;
248 struct mmc_request *rq;
249
250 host->next_slot = NULL;
251 mmc_omap_select_slot(next_slot, 1);
252
253 rq = next_slot->mrq;
254 next_slot->mrq = NULL;
255 mmc_omap_start_request(host, rq);
256}
257
258static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
259{
260 struct mmc_omap_host *host = slot->host;
261 unsigned long flags;
262 int i;
263
264 BUG_ON(slot == NULL || host->mmc == NULL);
265
266 if (clk_enabled)
267 /* Keeps clock running for at least 8 cycles on valid freq */
268 mod_timer(&host->clk_timer, jiffies + HZ/10);
269 else {
270 del_timer(&host->clk_timer);
271 mmc_omap_fclk_offdelay(slot);
272 mmc_omap_fclk_enable(host, 0);
273 }
274
275 spin_lock_irqsave(&host->slot_lock, flags);
276 /* Check for any pending requests */
277 for (i = 0; i < host->nr_slots; i++) {
278 struct mmc_omap_slot *new_slot;
279
280 if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
281 continue;
282
283 BUG_ON(host->next_slot != NULL);
284 new_slot = host->slots[i];
285 /* The current slot should not have a request in queue */
286 BUG_ON(new_slot == host->current_slot);
287
288 host->next_slot = new_slot;
289 host->mmc = new_slot->mmc;
290 spin_unlock_irqrestore(&host->slot_lock, flags);
291 queue_work(host->mmc_omap_wq, &host->slot_release_work);
292 return;
293 }
294
295 host->mmc = NULL;
296 wake_up(&host->slot_wq);
297 spin_unlock_irqrestore(&host->slot_lock, flags);
298}
299
300static inline
301int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
302{
303 if (slot->pdata->get_cover_state)
304 return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
305 slot->id);
306 return 0;
307}
308
309static ssize_t
310mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
311 char *buf)
312{
313 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
314 struct mmc_omap_slot *slot = mmc_priv(mmc);
315
316 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
317 "closed");
318}
319
320static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
321
322static ssize_t
323mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
324 char *buf)
325{
326 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
327 struct mmc_omap_slot *slot = mmc_priv(mmc);
328
329 return sprintf(buf, "%s\n", slot->pdata->name);
330}
331
332static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
333
334static void
335mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
336{
337 u32 cmdreg;
338 u32 resptype;
339 u32 cmdtype;
340 u16 irq_mask;
341
342 host->cmd = cmd;
343
344 resptype = 0;
345 cmdtype = 0;
346
347 /* Our hardware needs to know exact type */
348 switch (mmc_resp_type(cmd)) {
349 case MMC_RSP_NONE:
350 break;
351 case MMC_RSP_R1:
352 case MMC_RSP_R1B:
353 /* resp 1, 1b, 6, 7 */
354 resptype = 1;
355 break;
356 case MMC_RSP_R2:
357 resptype = 2;
358 break;
359 case MMC_RSP_R3:
360 resptype = 3;
361 break;
362 default:
363 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
364 break;
365 }
366
367 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
368 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
369 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
370 cmdtype = OMAP_MMC_CMDTYPE_BC;
371 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
372 cmdtype = OMAP_MMC_CMDTYPE_BCR;
373 } else {
374 cmdtype = OMAP_MMC_CMDTYPE_AC;
375 }
376
377 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
378
379 if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
380 cmdreg |= 1 << 6;
381
382 if (cmd->flags & MMC_RSP_BUSY)
383 cmdreg |= 1 << 11;
384
385 if (host->data && !(host->data->flags & MMC_DATA_WRITE))
386 cmdreg |= 1 << 15;
387
388 mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
389
390 OMAP_MMC_WRITE(host, CTO, 200);
391 OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
392 OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
393 irq_mask = OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
394 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
395 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
396 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
397 OMAP_MMC_STAT_END_OF_DATA;
398 if (cmd->opcode == MMC_ERASE)
399 irq_mask &= ~OMAP_MMC_STAT_DATA_TOUT;
400 OMAP_MMC_WRITE(host, IE, irq_mask);
401 OMAP_MMC_WRITE(host, CMD, cmdreg);
402}
403
404static void
405mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
406 int abort)
407{
408 enum dma_data_direction dma_data_dir;
409 struct device *dev = mmc_dev(host->mmc);
410 struct dma_chan *c;
411
412 if (data->flags & MMC_DATA_WRITE) {
413 dma_data_dir = DMA_TO_DEVICE;
414 c = host->dma_tx;
415 } else {
416 dma_data_dir = DMA_FROM_DEVICE;
417 c = host->dma_rx;
418 }
419 if (c) {
420 if (data->error) {
421 dmaengine_terminate_all(c);
422 /* Claim nothing transferred on error... */
423 data->bytes_xfered = 0;
424 }
425 dev = c->device->dev;
426 }
427 dma_unmap_sg(dev, data->sg, host->sg_len, dma_data_dir);
428}
429
430static void mmc_omap_send_stop_work(struct work_struct *work)
431{
432 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
433 send_stop_work);
434 struct mmc_omap_slot *slot = host->current_slot;
435 struct mmc_data *data = host->stop_data;
436 unsigned long tick_ns;
437
438 tick_ns = (1000000000 + slot->fclk_freq - 1)/slot->fclk_freq;
439 ndelay(8*tick_ns);
440
441 mmc_omap_start_command(host, data->stop);
442}
443
444static void
445mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
446{
447 if (host->dma_in_use)
448 mmc_omap_release_dma(host, data, data->error);
449
450 host->data = NULL;
451 host->sg_len = 0;
452
453 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
454 * dozens of requests until the card finishes writing data.
455 * It'd be cheaper to just wait till an EOFB interrupt arrives...
456 */
457
458 if (!data->stop) {
459 struct mmc_host *mmc;
460
461 host->mrq = NULL;
462 mmc = host->mmc;
463 mmc_omap_release_slot(host->current_slot, 1);
464 mmc_request_done(mmc, data->mrq);
465 return;
466 }
467
468 host->stop_data = data;
469 queue_work(host->mmc_omap_wq, &host->send_stop_work);
470}
471
472static void
473mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
474{
475 struct mmc_omap_slot *slot = host->current_slot;
476 unsigned int restarts, passes, timeout;
477 u16 stat = 0;
478
479 /* Sending abort takes 80 clocks. Have some extra and round up */
480 timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
481 restarts = 0;
482 while (restarts < maxloops) {
483 OMAP_MMC_WRITE(host, STAT, 0xFFFF);
484 OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
485
486 passes = 0;
487 while (passes < timeout) {
488 stat = OMAP_MMC_READ(host, STAT);
489 if (stat & OMAP_MMC_STAT_END_OF_CMD)
490 goto out;
491 udelay(1);
492 passes++;
493 }
494
495 restarts++;
496 }
497out:
498 OMAP_MMC_WRITE(host, STAT, stat);
499}
500
501static void
502mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
503{
504 if (host->dma_in_use)
505 mmc_omap_release_dma(host, data, 1);
506
507 host->data = NULL;
508 host->sg_len = 0;
509
510 mmc_omap_send_abort(host, 10000);
511}
512
513static void
514mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
515{
516 unsigned long flags;
517 int done;
518
519 if (!host->dma_in_use) {
520 mmc_omap_xfer_done(host, data);
521 return;
522 }
523 done = 0;
524 spin_lock_irqsave(&host->dma_lock, flags);
525 if (host->dma_done)
526 done = 1;
527 else
528 host->brs_received = 1;
529 spin_unlock_irqrestore(&host->dma_lock, flags);
530 if (done)
531 mmc_omap_xfer_done(host, data);
532}
533
534static void
535mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
536{
537 unsigned long flags;
538 int done;
539
540 done = 0;
541 spin_lock_irqsave(&host->dma_lock, flags);
542 if (host->brs_received)
543 done = 1;
544 else
545 host->dma_done = 1;
546 spin_unlock_irqrestore(&host->dma_lock, flags);
547 if (done)
548 mmc_omap_xfer_done(host, data);
549}
550
551static void
552mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
553{
554 host->cmd = NULL;
555
556 del_timer(&host->cmd_abort_timer);
557
558 if (cmd->flags & MMC_RSP_PRESENT) {
559 if (cmd->flags & MMC_RSP_136) {
560 /* response type 2 */
561 cmd->resp[3] =
562 OMAP_MMC_READ(host, RSP0) |
563 (OMAP_MMC_READ(host, RSP1) << 16);
564 cmd->resp[2] =
565 OMAP_MMC_READ(host, RSP2) |
566 (OMAP_MMC_READ(host, RSP3) << 16);
567 cmd->resp[1] =
568 OMAP_MMC_READ(host, RSP4) |
569 (OMAP_MMC_READ(host, RSP5) << 16);
570 cmd->resp[0] =
571 OMAP_MMC_READ(host, RSP6) |
572 (OMAP_MMC_READ(host, RSP7) << 16);
573 } else {
574 /* response types 1, 1b, 3, 4, 5, 6 */
575 cmd->resp[0] =
576 OMAP_MMC_READ(host, RSP6) |
577 (OMAP_MMC_READ(host, RSP7) << 16);
578 }
579 }
580
581 if (host->data == NULL || cmd->error) {
582 struct mmc_host *mmc;
583
584 if (host->data != NULL)
585 mmc_omap_abort_xfer(host, host->data);
586 host->mrq = NULL;
587 mmc = host->mmc;
588 mmc_omap_release_slot(host->current_slot, 1);
589 mmc_request_done(mmc, cmd->mrq);
590 }
591}
592
593/*
594 * Abort stuck command. Can occur when card is removed while it is being
595 * read.
596 */
597static void mmc_omap_abort_command(struct work_struct *work)
598{
599 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
600 cmd_abort_work);
601 BUG_ON(!host->cmd);
602
603 dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
604 host->cmd->opcode);
605
606 if (host->cmd->error == 0)
607 host->cmd->error = -ETIMEDOUT;
608
609 if (host->data == NULL) {
610 struct mmc_command *cmd;
611 struct mmc_host *mmc;
612
613 cmd = host->cmd;
614 host->cmd = NULL;
615 mmc_omap_send_abort(host, 10000);
616
617 host->mrq = NULL;
618 mmc = host->mmc;
619 mmc_omap_release_slot(host->current_slot, 1);
620 mmc_request_done(mmc, cmd->mrq);
621 } else
622 mmc_omap_cmd_done(host, host->cmd);
623
624 host->abort = 0;
625 enable_irq(host->irq);
626}
627
628static void
629mmc_omap_cmd_timer(unsigned long data)
630{
631 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
632 unsigned long flags;
633
634 spin_lock_irqsave(&host->slot_lock, flags);
635 if (host->cmd != NULL && !host->abort) {
636 OMAP_MMC_WRITE(host, IE, 0);
637 disable_irq(host->irq);
638 host->abort = 1;
639 queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
640 }
641 spin_unlock_irqrestore(&host->slot_lock, flags);
642}
643
644/* PIO only */
645static void
646mmc_omap_sg_to_buf(struct mmc_omap_host *host)
647{
648 struct scatterlist *sg;
649
650 sg = host->data->sg + host->sg_idx;
651 host->buffer_bytes_left = sg->length;
652 host->buffer = sg_virt(sg);
653 if (host->buffer_bytes_left > host->total_bytes_left)
654 host->buffer_bytes_left = host->total_bytes_left;
655}
656
657static void
658mmc_omap_clk_timer(unsigned long data)
659{
660 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
661
662 mmc_omap_fclk_enable(host, 0);
663}
664
665/* PIO only */
666static void
667mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
668{
669 int n, nwords;
670
671 if (host->buffer_bytes_left == 0) {
672 host->sg_idx++;
673 BUG_ON(host->sg_idx == host->sg_len);
674 mmc_omap_sg_to_buf(host);
675 }
676 n = 64;
677 if (n > host->buffer_bytes_left)
678 n = host->buffer_bytes_left;
679
680 nwords = n / 2;
681 nwords += n & 1; /* handle odd number of bytes to transfer */
682
683 host->buffer_bytes_left -= n;
684 host->total_bytes_left -= n;
685 host->data->bytes_xfered += n;
686
687 if (write) {
688 __raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA),
689 host->buffer, nwords);
690 } else {
691 __raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA),
692 host->buffer, nwords);
693 }
694
695 host->buffer += nwords;
696}
697
698#ifdef CONFIG_MMC_DEBUG
699static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
700{
701 static const char *mmc_omap_status_bits[] = {
702 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
703 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
704 };
705 int i;
706 char res[64], *buf = res;
707
708 buf += sprintf(buf, "MMC IRQ 0x%x:", status);
709
710 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
711 if (status & (1 << i))
712 buf += sprintf(buf, " %s", mmc_omap_status_bits[i]);
713 dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
714}
715#else
716static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
717{
718}
719#endif
720
721
722static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
723{
724 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
725 u16 status;
726 int end_command;
727 int end_transfer;
728 int transfer_error, cmd_error;
729
730 if (host->cmd == NULL && host->data == NULL) {
731 status = OMAP_MMC_READ(host, STAT);
732 dev_info(mmc_dev(host->slots[0]->mmc),
733 "Spurious IRQ 0x%04x\n", status);
734 if (status != 0) {
735 OMAP_MMC_WRITE(host, STAT, status);
736 OMAP_MMC_WRITE(host, IE, 0);
737 }
738 return IRQ_HANDLED;
739 }
740
741 end_command = 0;
742 end_transfer = 0;
743 transfer_error = 0;
744 cmd_error = 0;
745
746 while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
747 int cmd;
748
749 OMAP_MMC_WRITE(host, STAT, status);
750 if (host->cmd != NULL)
751 cmd = host->cmd->opcode;
752 else
753 cmd = -1;
754 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
755 status, cmd);
756 mmc_omap_report_irq(host, status);
757
758 if (host->total_bytes_left) {
759 if ((status & OMAP_MMC_STAT_A_FULL) ||
760 (status & OMAP_MMC_STAT_END_OF_DATA))
761 mmc_omap_xfer_data(host, 0);
762 if (status & OMAP_MMC_STAT_A_EMPTY)
763 mmc_omap_xfer_data(host, 1);
764 }
765
766 if (status & OMAP_MMC_STAT_END_OF_DATA)
767 end_transfer = 1;
768
769 if (status & OMAP_MMC_STAT_DATA_TOUT) {
770 dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
771 cmd);
772 if (host->data) {
773 host->data->error = -ETIMEDOUT;
774 transfer_error = 1;
775 }
776 }
777
778 if (status & OMAP_MMC_STAT_DATA_CRC) {
779 if (host->data) {
780 host->data->error = -EILSEQ;
781 dev_dbg(mmc_dev(host->mmc),
782 "data CRC error, bytes left %d\n",
783 host->total_bytes_left);
784 transfer_error = 1;
785 } else {
786 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
787 }
788 }
789
790 if (status & OMAP_MMC_STAT_CMD_TOUT) {
791 /* Timeouts are routine with some commands */
792 if (host->cmd) {
793 struct mmc_omap_slot *slot =
794 host->current_slot;
795 if (slot == NULL ||
796 !mmc_omap_cover_is_open(slot))
797 dev_err(mmc_dev(host->mmc),
798 "command timeout (CMD%d)\n",
799 cmd);
800 host->cmd->error = -ETIMEDOUT;
801 end_command = 1;
802 cmd_error = 1;
803 }
804 }
805
806 if (status & OMAP_MMC_STAT_CMD_CRC) {
807 if (host->cmd) {
808 dev_err(mmc_dev(host->mmc),
809 "command CRC error (CMD%d, arg 0x%08x)\n",
810 cmd, host->cmd->arg);
811 host->cmd->error = -EILSEQ;
812 end_command = 1;
813 cmd_error = 1;
814 } else
815 dev_err(mmc_dev(host->mmc),
816 "command CRC error without cmd?\n");
817 }
818
819 if (status & OMAP_MMC_STAT_CARD_ERR) {
820 dev_dbg(mmc_dev(host->mmc),
821 "ignoring card status error (CMD%d)\n",
822 cmd);
823 end_command = 1;
824 }
825
826 /*
827 * NOTE: On 1610 the END_OF_CMD may come too early when
828 * starting a write
829 */
830 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
831 (!(status & OMAP_MMC_STAT_A_EMPTY))) {
832 end_command = 1;
833 }
834 }
835
836 if (cmd_error && host->data) {
837 del_timer(&host->cmd_abort_timer);
838 host->abort = 1;
839 OMAP_MMC_WRITE(host, IE, 0);
840 disable_irq_nosync(host->irq);
841 queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
842 return IRQ_HANDLED;
843 }
844
845 if (end_command && host->cmd)
846 mmc_omap_cmd_done(host, host->cmd);
847 if (host->data != NULL) {
848 if (transfer_error)
849 mmc_omap_xfer_done(host, host->data);
850 else if (end_transfer)
851 mmc_omap_end_of_data(host, host->data);
852 }
853
854 return IRQ_HANDLED;
855}
856
857void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
858{
859 int cover_open;
860 struct mmc_omap_host *host = dev_get_drvdata(dev);
861 struct mmc_omap_slot *slot = host->slots[num];
862
863 BUG_ON(num >= host->nr_slots);
864
865 /* Other subsystems can call in here before we're initialised. */
866 if (host->nr_slots == 0 || !host->slots[num])
867 return;
868
869 cover_open = mmc_omap_cover_is_open(slot);
870 if (cover_open != slot->cover_open) {
871 slot->cover_open = cover_open;
872 sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
873 }
874
875 tasklet_hi_schedule(&slot->cover_tasklet);
876}
877
878static void mmc_omap_cover_timer(unsigned long arg)
879{
880 struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
881 tasklet_schedule(&slot->cover_tasklet);
882}
883
884static void mmc_omap_cover_handler(unsigned long param)
885{
886 struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
887 int cover_open = mmc_omap_cover_is_open(slot);
888
889 mmc_detect_change(slot->mmc, 0);
890 if (!cover_open)
891 return;
892
893 /*
894 * If no card is inserted, we postpone polling until
895 * the cover has been closed.
896 */
897 if (slot->mmc->card == NULL || !mmc_card_present(slot->mmc->card))
898 return;
899
900 mod_timer(&slot->cover_timer,
901 jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
902}
903
904static void mmc_omap_dma_callback(void *priv)
905{
906 struct mmc_omap_host *host = priv;
907 struct mmc_data *data = host->data;
908
909 /* If we got to the end of DMA, assume everything went well */
910 data->bytes_xfered += data->blocks * data->blksz;
911
912 mmc_omap_dma_done(host, data);
913}
914
915static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
916{
917 u16 reg;
918
919 reg = OMAP_MMC_READ(host, SDIO);
920 reg &= ~(1 << 5);
921 OMAP_MMC_WRITE(host, SDIO, reg);
922 /* Set maximum timeout */
923 OMAP_MMC_WRITE(host, CTO, 0xff);
924}
925
926static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
927{
928 unsigned int timeout, cycle_ns;
929 u16 reg;
930
931 cycle_ns = 1000000000 / host->current_slot->fclk_freq;
932 timeout = req->data->timeout_ns / cycle_ns;
933 timeout += req->data->timeout_clks;
934
935 /* Check if we need to use timeout multiplier register */
936 reg = OMAP_MMC_READ(host, SDIO);
937 if (timeout > 0xffff) {
938 reg |= (1 << 5);
939 timeout /= 1024;
940 } else
941 reg &= ~(1 << 5);
942 OMAP_MMC_WRITE(host, SDIO, reg);
943 OMAP_MMC_WRITE(host, DTO, timeout);
944}
945
946static void
947mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
948{
949 struct mmc_data *data = req->data;
950 int i, use_dma = 1, block_size;
951 unsigned sg_len;
952
953 host->data = data;
954 if (data == NULL) {
955 OMAP_MMC_WRITE(host, BLEN, 0);
956 OMAP_MMC_WRITE(host, NBLK, 0);
957 OMAP_MMC_WRITE(host, BUF, 0);
958 host->dma_in_use = 0;
959 set_cmd_timeout(host, req);
960 return;
961 }
962
963 block_size = data->blksz;
964
965 OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
966 OMAP_MMC_WRITE(host, BLEN, block_size - 1);
967 set_data_timeout(host, req);
968
969 /* cope with calling layer confusion; it issues "single
970 * block" writes using multi-block scatterlists.
971 */
972 sg_len = (data->blocks == 1) ? 1 : data->sg_len;
973
974 /* Only do DMA for entire blocks */
975 for (i = 0; i < sg_len; i++) {
976 if ((data->sg[i].length % block_size) != 0) {
977 use_dma = 0;
978 break;
979 }
980 }
981
982 host->sg_idx = 0;
983 if (use_dma) {
984 enum dma_data_direction dma_data_dir;
985 struct dma_async_tx_descriptor *tx;
986 struct dma_chan *c;
987 u32 burst, *bp;
988 u16 buf;
989
990 /*
991 * FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx
992 * and 24xx. Use 16 or 32 word frames when the
993 * blocksize is at least that large. Blocksize is
994 * usually 512 bytes; but not for some SD reads.
995 */
996 burst = mmc_omap15xx() ? 32 : 64;
997 if (burst > data->blksz)
998 burst = data->blksz;
999
1000 burst >>= 1;
1001
1002 if (data->flags & MMC_DATA_WRITE) {
1003 c = host->dma_tx;
1004 bp = &host->dma_tx_burst;
1005 buf = 0x0f80 | (burst - 1) << 0;
1006 dma_data_dir = DMA_TO_DEVICE;
1007 } else {
1008 c = host->dma_rx;
1009 bp = &host->dma_rx_burst;
1010 buf = 0x800f | (burst - 1) << 8;
1011 dma_data_dir = DMA_FROM_DEVICE;
1012 }
1013
1014 if (!c)
1015 goto use_pio;
1016
1017 /* Only reconfigure if we have a different burst size */
1018 if (*bp != burst) {
1019 struct dma_slave_config cfg;
1020
1021 cfg.src_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1022 cfg.dst_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1023 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1024 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1025 cfg.src_maxburst = burst;
1026 cfg.dst_maxburst = burst;
1027
1028 if (dmaengine_slave_config(c, &cfg))
1029 goto use_pio;
1030
1031 *bp = burst;
1032 }
1033
1034 host->sg_len = dma_map_sg(c->device->dev, data->sg, sg_len,
1035 dma_data_dir);
1036 if (host->sg_len == 0)
1037 goto use_pio;
1038
1039 tx = dmaengine_prep_slave_sg(c, data->sg, host->sg_len,
1040 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1041 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1042 if (!tx)
1043 goto use_pio;
1044
1045 OMAP_MMC_WRITE(host, BUF, buf);
1046
1047 tx->callback = mmc_omap_dma_callback;
1048 tx->callback_param = host;
1049 dmaengine_submit(tx);
1050 host->brs_received = 0;
1051 host->dma_done = 0;
1052 host->dma_in_use = 1;
1053 return;
1054 }
1055 use_pio:
1056
1057 /* Revert to PIO? */
1058 OMAP_MMC_WRITE(host, BUF, 0x1f1f);
1059 host->total_bytes_left = data->blocks * block_size;
1060 host->sg_len = sg_len;
1061 mmc_omap_sg_to_buf(host);
1062 host->dma_in_use = 0;
1063}
1064
1065static void mmc_omap_start_request(struct mmc_omap_host *host,
1066 struct mmc_request *req)
1067{
1068 BUG_ON(host->mrq != NULL);
1069
1070 host->mrq = req;
1071
1072 /* only touch fifo AFTER the controller readies it */
1073 mmc_omap_prepare_data(host, req);
1074 mmc_omap_start_command(host, req->cmd);
1075 if (host->dma_in_use) {
1076 struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ?
1077 host->dma_tx : host->dma_rx;
1078
1079 dma_async_issue_pending(c);
1080 }
1081}
1082
1083static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
1084{
1085 struct mmc_omap_slot *slot = mmc_priv(mmc);
1086 struct mmc_omap_host *host = slot->host;
1087 unsigned long flags;
1088
1089 spin_lock_irqsave(&host->slot_lock, flags);
1090 if (host->mmc != NULL) {
1091 BUG_ON(slot->mrq != NULL);
1092 slot->mrq = req;
1093 spin_unlock_irqrestore(&host->slot_lock, flags);
1094 return;
1095 } else
1096 host->mmc = mmc;
1097 spin_unlock_irqrestore(&host->slot_lock, flags);
1098 mmc_omap_select_slot(slot, 1);
1099 mmc_omap_start_request(host, req);
1100}
1101
1102static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
1103 int vdd)
1104{
1105 struct mmc_omap_host *host;
1106
1107 host = slot->host;
1108
1109 if (slot->pdata->set_power != NULL)
1110 slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
1111 vdd);
1112 if (mmc_omap2()) {
1113 u16 w;
1114
1115 if (power_on) {
1116 w = OMAP_MMC_READ(host, CON);
1117 OMAP_MMC_WRITE(host, CON, w | (1 << 11));
1118 } else {
1119 w = OMAP_MMC_READ(host, CON);
1120 OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
1121 }
1122 }
1123}
1124
1125static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
1126{
1127 struct mmc_omap_slot *slot = mmc_priv(mmc);
1128 struct mmc_omap_host *host = slot->host;
1129 int func_clk_rate = clk_get_rate(host->fclk);
1130 int dsor;
1131
1132 if (ios->clock == 0)
1133 return 0;
1134
1135 dsor = func_clk_rate / ios->clock;
1136 if (dsor < 1)
1137 dsor = 1;
1138
1139 if (func_clk_rate / dsor > ios->clock)
1140 dsor++;
1141
1142 if (dsor > 250)
1143 dsor = 250;
1144
1145 slot->fclk_freq = func_clk_rate / dsor;
1146
1147 if (ios->bus_width == MMC_BUS_WIDTH_4)
1148 dsor |= 1 << 15;
1149
1150 return dsor;
1151}
1152
1153static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1154{
1155 struct mmc_omap_slot *slot = mmc_priv(mmc);
1156 struct mmc_omap_host *host = slot->host;
1157 int i, dsor;
1158 int clk_enabled;
1159
1160 mmc_omap_select_slot(slot, 0);
1161
1162 dsor = mmc_omap_calc_divisor(mmc, ios);
1163
1164 if (ios->vdd != slot->vdd)
1165 slot->vdd = ios->vdd;
1166
1167 clk_enabled = 0;
1168 switch (ios->power_mode) {
1169 case MMC_POWER_OFF:
1170 mmc_omap_set_power(slot, 0, ios->vdd);
1171 break;
1172 case MMC_POWER_UP:
1173 /* Cannot touch dsor yet, just power up MMC */
1174 mmc_omap_set_power(slot, 1, ios->vdd);
1175 goto exit;
1176 case MMC_POWER_ON:
1177 mmc_omap_fclk_enable(host, 1);
1178 clk_enabled = 1;
1179 dsor |= 1 << 11;
1180 break;
1181 }
1182
1183 if (slot->bus_mode != ios->bus_mode) {
1184 if (slot->pdata->set_bus_mode != NULL)
1185 slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
1186 ios->bus_mode);
1187 slot->bus_mode = ios->bus_mode;
1188 }
1189
1190 /* On insanely high arm_per frequencies something sometimes
1191 * goes somehow out of sync, and the POW bit is not being set,
1192 * which results in the while loop below getting stuck.
1193 * Writing to the CON register twice seems to do the trick. */
1194 for (i = 0; i < 2; i++)
1195 OMAP_MMC_WRITE(host, CON, dsor);
1196 slot->saved_con = dsor;
1197 if (ios->power_mode == MMC_POWER_ON) {
1198 /* worst case at 400kHz, 80 cycles makes 200 microsecs */
1199 int usecs = 250;
1200
1201 /* Send clock cycles, poll completion */
1202 OMAP_MMC_WRITE(host, IE, 0);
1203 OMAP_MMC_WRITE(host, STAT, 0xffff);
1204 OMAP_MMC_WRITE(host, CMD, 1 << 7);
1205 while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
1206 udelay(1);
1207 usecs--;
1208 }
1209 OMAP_MMC_WRITE(host, STAT, 1);
1210 }
1211
1212exit:
1213 mmc_omap_release_slot(slot, clk_enabled);
1214}
1215
1216static const struct mmc_host_ops mmc_omap_ops = {
1217 .request = mmc_omap_request,
1218 .set_ios = mmc_omap_set_ios,
1219};
1220
1221static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
1222{
1223 struct mmc_omap_slot *slot = NULL;
1224 struct mmc_host *mmc;
1225 int r;
1226
1227 mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
1228 if (mmc == NULL)
1229 return -ENOMEM;
1230
1231 slot = mmc_priv(mmc);
1232 slot->host = host;
1233 slot->mmc = mmc;
1234 slot->id = id;
1235 slot->pdata = &host->pdata->slots[id];
1236
1237 host->slots[id] = slot;
1238
1239 mmc->caps = 0;
1240 if (host->pdata->slots[id].wires >= 4)
1241 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_ERASE;
1242
1243 mmc->ops = &mmc_omap_ops;
1244 mmc->f_min = 400000;
1245
1246 if (mmc_omap2())
1247 mmc->f_max = 48000000;
1248 else
1249 mmc->f_max = 24000000;
1250 if (host->pdata->max_freq)
1251 mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
1252 mmc->ocr_avail = slot->pdata->ocr_mask;
1253
1254 /* Use scatterlist DMA to reduce per-transfer costs.
1255 * NOTE max_seg_size assumption that small blocks aren't
1256 * normally used (except e.g. for reading SD registers).
1257 */
1258 mmc->max_segs = 32;
1259 mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
1260 mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
1261 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1262 mmc->max_seg_size = mmc->max_req_size;
1263
1264 if (slot->pdata->get_cover_state != NULL) {
1265 setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
1266 (unsigned long)slot);
1267 tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
1268 (unsigned long)slot);
1269 }
1270
1271 r = mmc_add_host(mmc);
1272 if (r < 0)
1273 goto err_remove_host;
1274
1275 if (slot->pdata->name != NULL) {
1276 r = device_create_file(&mmc->class_dev,
1277 &dev_attr_slot_name);
1278 if (r < 0)
1279 goto err_remove_host;
1280 }
1281
1282 if (slot->pdata->get_cover_state != NULL) {
1283 r = device_create_file(&mmc->class_dev,
1284 &dev_attr_cover_switch);
1285 if (r < 0)
1286 goto err_remove_slot_name;
1287 tasklet_schedule(&slot->cover_tasklet);
1288 }
1289
1290 return 0;
1291
1292err_remove_slot_name:
1293 if (slot->pdata->name != NULL)
1294 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1295err_remove_host:
1296 mmc_remove_host(mmc);
1297 mmc_free_host(mmc);
1298 return r;
1299}
1300
1301static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
1302{
1303 struct mmc_host *mmc = slot->mmc;
1304
1305 if (slot->pdata->name != NULL)
1306 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1307 if (slot->pdata->get_cover_state != NULL)
1308 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1309
1310 tasklet_kill(&slot->cover_tasklet);
1311 del_timer_sync(&slot->cover_timer);
1312 flush_workqueue(slot->host->mmc_omap_wq);
1313
1314 mmc_remove_host(mmc);
1315 mmc_free_host(mmc);
1316}
1317
1318static int mmc_omap_probe(struct platform_device *pdev)
1319{
1320 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1321 struct mmc_omap_host *host = NULL;
1322 struct resource *res;
1323 dma_cap_mask_t mask;
1324 unsigned sig = 0;
1325 int i, ret = 0;
1326 int irq;
1327
1328 if (pdata == NULL) {
1329 dev_err(&pdev->dev, "platform data missing\n");
1330 return -ENXIO;
1331 }
1332 if (pdata->nr_slots == 0) {
1333 dev_err(&pdev->dev, "no slots\n");
1334 return -EPROBE_DEFER;
1335 }
1336
1337 host = devm_kzalloc(&pdev->dev, sizeof(struct mmc_omap_host),
1338 GFP_KERNEL);
1339 if (host == NULL)
1340 return -ENOMEM;
1341
1342 irq = platform_get_irq(pdev, 0);
1343 if (irq < 0)
1344 return -ENXIO;
1345
1346 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1347 host->virt_base = devm_ioremap_resource(&pdev->dev, res);
1348 if (IS_ERR(host->virt_base))
1349 return PTR_ERR(host->virt_base);
1350
1351 INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
1352 INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
1353
1354 INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
1355 setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
1356 (unsigned long) host);
1357
1358 spin_lock_init(&host->clk_lock);
1359 setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
1360
1361 spin_lock_init(&host->dma_lock);
1362 spin_lock_init(&host->slot_lock);
1363 init_waitqueue_head(&host->slot_wq);
1364
1365 host->pdata = pdata;
1366 host->features = host->pdata->slots[0].features;
1367 host->dev = &pdev->dev;
1368 platform_set_drvdata(pdev, host);
1369
1370 host->id = pdev->id;
1371 host->irq = irq;
1372 host->phys_base = res->start;
1373 host->iclk = clk_get(&pdev->dev, "ick");
1374 if (IS_ERR(host->iclk))
1375 return PTR_ERR(host->iclk);
1376 clk_enable(host->iclk);
1377
1378 host->fclk = clk_get(&pdev->dev, "fck");
1379 if (IS_ERR(host->fclk)) {
1380 ret = PTR_ERR(host->fclk);
1381 goto err_free_iclk;
1382 }
1383
1384 dma_cap_zero(mask);
1385 dma_cap_set(DMA_SLAVE, mask);
1386
1387 host->dma_tx_burst = -1;
1388 host->dma_rx_burst = -1;
1389
1390 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1391 if (res)
1392 sig = res->start;
1393 host->dma_tx = dma_request_slave_channel_compat(mask,
1394 omap_dma_filter_fn, &sig, &pdev->dev, "tx");
1395 if (!host->dma_tx)
1396 dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
1397 sig);
1398
1399 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1400 if (res)
1401 sig = res->start;
1402 host->dma_rx = dma_request_slave_channel_compat(mask,
1403 omap_dma_filter_fn, &sig, &pdev->dev, "rx");
1404 if (!host->dma_rx)
1405 dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
1406 sig);
1407
1408 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1409 if (ret)
1410 goto err_free_dma;
1411
1412 if (pdata->init != NULL) {
1413 ret = pdata->init(&pdev->dev);
1414 if (ret < 0)
1415 goto err_free_irq;
1416 }
1417
1418 host->nr_slots = pdata->nr_slots;
1419 host->reg_shift = (mmc_omap7xx() ? 1 : 2);
1420
1421 host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
1422 if (!host->mmc_omap_wq)
1423 goto err_plat_cleanup;
1424
1425 for (i = 0; i < pdata->nr_slots; i++) {
1426 ret = mmc_omap_new_slot(host, i);
1427 if (ret < 0) {
1428 while (--i >= 0)
1429 mmc_omap_remove_slot(host->slots[i]);
1430
1431 goto err_destroy_wq;
1432 }
1433 }
1434
1435 return 0;
1436
1437err_destroy_wq:
1438 destroy_workqueue(host->mmc_omap_wq);
1439err_plat_cleanup:
1440 if (pdata->cleanup)
1441 pdata->cleanup(&pdev->dev);
1442err_free_irq:
1443 free_irq(host->irq, host);
1444err_free_dma:
1445 if (host->dma_tx)
1446 dma_release_channel(host->dma_tx);
1447 if (host->dma_rx)
1448 dma_release_channel(host->dma_rx);
1449 clk_put(host->fclk);
1450err_free_iclk:
1451 clk_disable(host->iclk);
1452 clk_put(host->iclk);
1453 return ret;
1454}
1455
1456static int mmc_omap_remove(struct platform_device *pdev)
1457{
1458 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1459 int i;
1460
1461 BUG_ON(host == NULL);
1462
1463 for (i = 0; i < host->nr_slots; i++)
1464 mmc_omap_remove_slot(host->slots[i]);
1465
1466 if (host->pdata->cleanup)
1467 host->pdata->cleanup(&pdev->dev);
1468
1469 mmc_omap_fclk_enable(host, 0);
1470 free_irq(host->irq, host);
1471 clk_put(host->fclk);
1472 clk_disable(host->iclk);
1473 clk_put(host->iclk);
1474
1475 if (host->dma_tx)
1476 dma_release_channel(host->dma_tx);
1477 if (host->dma_rx)
1478 dma_release_channel(host->dma_rx);
1479
1480 destroy_workqueue(host->mmc_omap_wq);
1481
1482 return 0;
1483}
1484
1485#if IS_BUILTIN(CONFIG_OF)
1486static const struct of_device_id mmc_omap_match[] = {
1487 { .compatible = "ti,omap2420-mmc", },
1488 { },
1489};
1490#endif
1491
1492static struct platform_driver mmc_omap_driver = {
1493 .probe = mmc_omap_probe,
1494 .remove = mmc_omap_remove,
1495 .driver = {
1496 .name = DRIVER_NAME,
1497 .owner = THIS_MODULE,
1498 .of_match_table = of_match_ptr(mmc_omap_match),
1499 },
1500};
1501
1502module_platform_driver(mmc_omap_driver);
1503MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1504MODULE_LICENSE("GPL");
1505MODULE_ALIAS("platform:" DRIVER_NAME);
1506MODULE_AUTHOR("Juha Yrjölä");