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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / mmc / host / omap.c
blobb94f38ec2a838acff3f67861a8059eb22d41c2ff
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/omap-dma.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/card.h>
28 #include <linux/clk.h>
29 #include <linux/scatterlist.h>
30 #include <linux/slab.h>
31 #include <linux/platform_data/mmc-omap.h>
32
33
34 #define OMAP_MMC_REG_CMD 0x00
35 #define OMAP_MMC_REG_ARGL 0x01
36 #define OMAP_MMC_REG_ARGH 0x02
37 #define OMAP_MMC_REG_CON 0x03
38 #define OMAP_MMC_REG_STAT 0x04
39 #define OMAP_MMC_REG_IE 0x05
40 #define OMAP_MMC_REG_CTO 0x06
41 #define OMAP_MMC_REG_DTO 0x07
42 #define OMAP_MMC_REG_DATA 0x08
43 #define OMAP_MMC_REG_BLEN 0x09
44 #define OMAP_MMC_REG_NBLK 0x0a
45 #define OMAP_MMC_REG_BUF 0x0b
46 #define OMAP_MMC_REG_SDIO 0x0d
47 #define OMAP_MMC_REG_REV 0x0f
48 #define OMAP_MMC_REG_RSP0 0x10
49 #define OMAP_MMC_REG_RSP1 0x11
50 #define OMAP_MMC_REG_RSP2 0x12
51 #define OMAP_MMC_REG_RSP3 0x13
52 #define OMAP_MMC_REG_RSP4 0x14
53 #define OMAP_MMC_REG_RSP5 0x15
54 #define OMAP_MMC_REG_RSP6 0x16
55 #define OMAP_MMC_REG_RSP7 0x17
56 #define OMAP_MMC_REG_IOSR 0x18
57 #define OMAP_MMC_REG_SYSC 0x19
58 #define OMAP_MMC_REG_SYSS 0x1a
59
60 #define OMAP_MMC_STAT_CARD_ERR (1 << 14)
61 #define OMAP_MMC_STAT_CARD_IRQ (1 << 13)
62 #define OMAP_MMC_STAT_OCR_BUSY (1 << 12)
63 #define OMAP_MMC_STAT_A_EMPTY (1 << 11)
64 #define OMAP_MMC_STAT_A_FULL (1 << 10)
65 #define OMAP_MMC_STAT_CMD_CRC (1 << 8)
66 #define OMAP_MMC_STAT_CMD_TOUT (1 << 7)
67 #define OMAP_MMC_STAT_DATA_CRC (1 << 6)
68 #define OMAP_MMC_STAT_DATA_TOUT (1 << 5)
69 #define OMAP_MMC_STAT_END_BUSY (1 << 4)
70 #define OMAP_MMC_STAT_END_OF_DATA (1 << 3)
71 #define OMAP_MMC_STAT_CARD_BUSY (1 << 2)
72 #define OMAP_MMC_STAT_END_OF_CMD (1 << 0)
73
74 #define mmc_omap7xx() (host->features & MMC_OMAP7XX)
75 #define mmc_omap15xx() (host->features & MMC_OMAP15XX)
76 #define mmc_omap16xx() (host->features & MMC_OMAP16XX)
77 #define MMC_OMAP1_MASK (MMC_OMAP7XX | MMC_OMAP15XX | MMC_OMAP16XX)
78 #define mmc_omap1() (host->features & MMC_OMAP1_MASK)
79 #define mmc_omap2() (!mmc_omap1())
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 #define OMAP_DMA_MMC_TX 21
94 #define OMAP_DMA_MMC_RX 22
95 #define OMAP_DMA_MMC2_TX 54
96 #define OMAP_DMA_MMC2_RX 55
97
98 #define OMAP24XX_DMA_MMC2_TX 47
99 #define OMAP24XX_DMA_MMC2_RX 48
100 #define OMAP24XX_DMA_MMC1_TX 61
101 #define OMAP24XX_DMA_MMC1_RX 62
102
103
104 #define DRIVER_NAME "mmci-omap"
105
106 /* Specifies how often in millisecs to poll for card status changes
107 * when the cover switch is open */
108 #define OMAP_MMC_COVER_POLL_DELAY 500
109
110 struct mmc_omap_host;
111
112 struct mmc_omap_slot {
113 int id;
114 unsigned int vdd;
115 u16 saved_con;
116 u16 bus_mode;
117 unsigned int fclk_freq;
118
119 struct tasklet_struct cover_tasklet;
120 struct timer_list cover_timer;
121 unsigned cover_open;
122
123 struct mmc_request *mrq;
124 struct mmc_omap_host *host;
125 struct mmc_host *mmc;
126 struct omap_mmc_slot_data *pdata;
127 };
128
129 struct mmc_omap_host {
130 int initialized;
131 int suspended;
132 struct mmc_request * mrq;
133 struct mmc_command * cmd;
134 struct mmc_data * data;
135 struct mmc_host * mmc;
136 struct device * dev;
137 unsigned char id; /* 16xx chips have 2 MMC blocks */
138 struct clk * iclk;
139 struct clk * fclk;
140 struct dma_chan *dma_rx;
141 u32 dma_rx_burst;
142 struct dma_chan *dma_tx;
143 u32 dma_tx_burst;
144 struct resource *mem_res;
145 void __iomem *virt_base;
146 unsigned int phys_base;
147 int irq;
148 unsigned char bus_mode;
149 unsigned int reg_shift;
150
151 struct work_struct cmd_abort_work;
152 unsigned abort:1;
153 struct timer_list cmd_abort_timer;
154
155 struct work_struct slot_release_work;
156 struct mmc_omap_slot *next_slot;
157 struct work_struct send_stop_work;
158 struct mmc_data *stop_data;
159
160 unsigned int sg_len;
161 int sg_idx;
162 u16 * buffer;
163 u32 buffer_bytes_left;
164 u32 total_bytes_left;
165
166 unsigned features;
167 unsigned use_dma:1;
168 unsigned brs_received:1, dma_done:1;
169 unsigned dma_in_use:1;
170 spinlock_t dma_lock;
171
172 struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS];
173 struct mmc_omap_slot *current_slot;
174 spinlock_t slot_lock;
175 wait_queue_head_t slot_wq;
176 int nr_slots;
177
178 struct timer_list clk_timer;
179 spinlock_t clk_lock; /* for changing enabled state */
180 unsigned int fclk_enabled:1;
181 struct workqueue_struct *mmc_omap_wq;
182
183 struct omap_mmc_platform_data *pdata;
184 };
185
186
187 static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot)
188 {
189 unsigned long tick_ns;
190
191 if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) {
192 tick_ns = (1000000000 + slot->fclk_freq - 1) / slot->fclk_freq;
193 ndelay(8 * tick_ns);
194 }
195 }
196
197 static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable)
198 {
199 unsigned long flags;
200
201 spin_lock_irqsave(&host->clk_lock, flags);
202 if (host->fclk_enabled != enable) {
203 host->fclk_enabled = enable;
204 if (enable)
205 clk_enable(host->fclk);
206 else
207 clk_disable(host->fclk);
208 }
209 spin_unlock_irqrestore(&host->clk_lock, flags);
210 }
211
212 static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed)
213 {
214 struct mmc_omap_host *host = slot->host;
215 unsigned long flags;
216
217 if (claimed)
218 goto no_claim;
219 spin_lock_irqsave(&host->slot_lock, flags);
220 while (host->mmc != NULL) {
221 spin_unlock_irqrestore(&host->slot_lock, flags);
222 wait_event(host->slot_wq, host->mmc == NULL);
223 spin_lock_irqsave(&host->slot_lock, flags);
224 }
225 host->mmc = slot->mmc;
226 spin_unlock_irqrestore(&host->slot_lock, flags);
227 no_claim:
228 del_timer(&host->clk_timer);
229 if (host->current_slot != slot || !claimed)
230 mmc_omap_fclk_offdelay(host->current_slot);
231
232 if (host->current_slot != slot) {
233 OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00);
234 if (host->pdata->switch_slot != NULL)
235 host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id);
236 host->current_slot = slot;
237 }
238
239 if (claimed) {
240 mmc_omap_fclk_enable(host, 1);
241
242 /* Doing the dummy read here seems to work around some bug
243 * at least in OMAP24xx silicon where the command would not
244 * start after writing the CMD register. Sigh. */
245 OMAP_MMC_READ(host, CON);
246
247 OMAP_MMC_WRITE(host, CON, slot->saved_con);
248 } else
249 mmc_omap_fclk_enable(host, 0);
250 }
251
252 static void mmc_omap_start_request(struct mmc_omap_host *host,
253 struct mmc_request *req);
254
255 static void mmc_omap_slot_release_work(struct work_struct *work)
256 {
257 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
258 slot_release_work);
259 struct mmc_omap_slot *next_slot = host->next_slot;
260 struct mmc_request *rq;
261
262 host->next_slot = NULL;
263 mmc_omap_select_slot(next_slot, 1);
264
265 rq = next_slot->mrq;
266 next_slot->mrq = NULL;
267 mmc_omap_start_request(host, rq);
268 }
269
270 static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled)
271 {
272 struct mmc_omap_host *host = slot->host;
273 unsigned long flags;
274 int i;
275
276 BUG_ON(slot == NULL || host->mmc == NULL);
277
278 if (clk_enabled)
279 /* Keeps clock running for at least 8 cycles on valid freq */
280 mod_timer(&host->clk_timer, jiffies + HZ/10);
281 else {
282 del_timer(&host->clk_timer);
283 mmc_omap_fclk_offdelay(slot);
284 mmc_omap_fclk_enable(host, 0);
285 }
286
287 spin_lock_irqsave(&host->slot_lock, flags);
288 /* Check for any pending requests */
289 for (i = 0; i < host->nr_slots; i++) {
290 struct mmc_omap_slot *new_slot;
291
292 if (host->slots[i] == NULL || host->slots[i]->mrq == NULL)
293 continue;
294
295 BUG_ON(host->next_slot != NULL);
296 new_slot = host->slots[i];
297 /* The current slot should not have a request in queue */
298 BUG_ON(new_slot == host->current_slot);
299
300 host->next_slot = new_slot;
301 host->mmc = new_slot->mmc;
302 spin_unlock_irqrestore(&host->slot_lock, flags);
303 queue_work(host->mmc_omap_wq, &host->slot_release_work);
304 return;
305 }
306
307 host->mmc = NULL;
308 wake_up(&host->slot_wq);
309 spin_unlock_irqrestore(&host->slot_lock, flags);
310 }
311
312 static inline
313 int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
314 {
315 if (slot->pdata->get_cover_state)
316 return slot->pdata->get_cover_state(mmc_dev(slot->mmc),
317 slot->id);
318 return 0;
319 }
320
321 static ssize_t
322 mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
323 char *buf)
324 {
325 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
326 struct mmc_omap_slot *slot = mmc_priv(mmc);
327
328 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
329 "closed");
330 }
331
332 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
333
334 static ssize_t
335 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
336 char *buf)
337 {
338 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
339 struct mmc_omap_slot *slot = mmc_priv(mmc);
340
341 return sprintf(buf, "%s\n", slot->pdata->name);
342 }
343
344 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
345
346 static void
347 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
348 {
349 u32 cmdreg;
350 u32 resptype;
351 u32 cmdtype;
352
353 host->cmd = cmd;
354
355 resptype = 0;
356 cmdtype = 0;
357
358 /* Our hardware needs to know exact type */
359 switch (mmc_resp_type(cmd)) {
360 case MMC_RSP_NONE:
361 break;
362 case MMC_RSP_R1:
363 case MMC_RSP_R1B:
364 /* resp 1, 1b, 6, 7 */
365 resptype = 1;
366 break;
367 case MMC_RSP_R2:
368 resptype = 2;
369 break;
370 case MMC_RSP_R3:
371 resptype = 3;
372 break;
373 default:
374 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd));
375 break;
376 }
377
378 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) {
379 cmdtype = OMAP_MMC_CMDTYPE_ADTC;
380 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) {
381 cmdtype = OMAP_MMC_CMDTYPE_BC;
382 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) {
383 cmdtype = OMAP_MMC_CMDTYPE_BCR;
384 } else {
385 cmdtype = OMAP_MMC_CMDTYPE_AC;
386 }
387
388 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
389
390 if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN)
391 cmdreg |= 1 << 6;
392
393 if (cmd->flags & MMC_RSP_BUSY)
394 cmdreg |= 1 << 11;
395
396 if (host->data && !(host->data->flags & MMC_DATA_WRITE))
397 cmdreg |= 1 << 15;
398
399 mod_timer(&host->cmd_abort_timer, jiffies + HZ/2);
400
401 OMAP_MMC_WRITE(host, CTO, 200);
402 OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff);
403 OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16);
404 OMAP_MMC_WRITE(host, IE,
405 OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL |
406 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT |
407 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT |
408 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR |
409 OMAP_MMC_STAT_END_OF_DATA);
410 OMAP_MMC_WRITE(host, CMD, cmdreg);
411 }
412
413 static void
414 mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
415 int abort)
416 {
417 enum dma_data_direction dma_data_dir;
418 struct device *dev = mmc_dev(host->mmc);
419 struct dma_chan *c;
420
421 if (data->flags & MMC_DATA_WRITE) {
422 dma_data_dir = DMA_TO_DEVICE;
423 c = host->dma_tx;
424 } else {
425 dma_data_dir = DMA_FROM_DEVICE;
426 c = host->dma_rx;
427 }
428 if (c) {
429 if (data->error) {
430 dmaengine_terminate_all(c);
431 /* Claim nothing transferred on error... */
432 data->bytes_xfered = 0;
433 }
434 dev = c->device->dev;
435 }
436 dma_unmap_sg(dev, data->sg, host->sg_len, dma_data_dir);
437 }
438
439 static void mmc_omap_send_stop_work(struct work_struct *work)
440 {
441 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
442 send_stop_work);
443 struct mmc_omap_slot *slot = host->current_slot;
444 struct mmc_data *data = host->stop_data;
445 unsigned long tick_ns;
446
447 tick_ns = (1000000000 + slot->fclk_freq - 1)/slot->fclk_freq;
448 ndelay(8*tick_ns);
449
450 mmc_omap_start_command(host, data->stop);
451 }
452
453 static void
454 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
455 {
456 if (host->dma_in_use)
457 mmc_omap_release_dma(host, data, data->error);
458
459 host->data = NULL;
460 host->sg_len = 0;
461
462 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
463 * dozens of requests until the card finishes writing data.
464 * It'd be cheaper to just wait till an EOFB interrupt arrives...
465 */
466
467 if (!data->stop) {
468 struct mmc_host *mmc;
469
470 host->mrq = NULL;
471 mmc = host->mmc;
472 mmc_omap_release_slot(host->current_slot, 1);
473 mmc_request_done(mmc, data->mrq);
474 return;
475 }
476
477 host->stop_data = data;
478 queue_work(host->mmc_omap_wq, &host->send_stop_work);
479 }
480
481 static void
482 mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops)
483 {
484 struct mmc_omap_slot *slot = host->current_slot;
485 unsigned int restarts, passes, timeout;
486 u16 stat = 0;
487
488 /* Sending abort takes 80 clocks. Have some extra and round up */
489 timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq;
490 restarts = 0;
491 while (restarts < maxloops) {
492 OMAP_MMC_WRITE(host, STAT, 0xFFFF);
493 OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7));
494
495 passes = 0;
496 while (passes < timeout) {
497 stat = OMAP_MMC_READ(host, STAT);
498 if (stat & OMAP_MMC_STAT_END_OF_CMD)
499 goto out;
500 udelay(1);
501 passes++;
502 }
503
504 restarts++;
505 }
506 out:
507 OMAP_MMC_WRITE(host, STAT, stat);
508 }
509
510 static void
511 mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
512 {
513 if (host->dma_in_use)
514 mmc_omap_release_dma(host, data, 1);
515
516 host->data = NULL;
517 host->sg_len = 0;
518
519 mmc_omap_send_abort(host, 10000);
520 }
521
522 static void
523 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
524 {
525 unsigned long flags;
526 int done;
527
528 if (!host->dma_in_use) {
529 mmc_omap_xfer_done(host, data);
530 return;
531 }
532 done = 0;
533 spin_lock_irqsave(&host->dma_lock, flags);
534 if (host->dma_done)
535 done = 1;
536 else
537 host->brs_received = 1;
538 spin_unlock_irqrestore(&host->dma_lock, flags);
539 if (done)
540 mmc_omap_xfer_done(host, data);
541 }
542
543 static void
544 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data)
545 {
546 unsigned long flags;
547 int done;
548
549 done = 0;
550 spin_lock_irqsave(&host->dma_lock, flags);
551 if (host->brs_received)
552 done = 1;
553 else
554 host->dma_done = 1;
555 spin_unlock_irqrestore(&host->dma_lock, flags);
556 if (done)
557 mmc_omap_xfer_done(host, data);
558 }
559
560 static void
561 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
562 {
563 host->cmd = NULL;
564
565 del_timer(&host->cmd_abort_timer);
566
567 if (cmd->flags & MMC_RSP_PRESENT) {
568 if (cmd->flags & MMC_RSP_136) {
569 /* response type 2 */
570 cmd->resp[3] =
571 OMAP_MMC_READ(host, RSP0) |
572 (OMAP_MMC_READ(host, RSP1) << 16);
573 cmd->resp[2] =
574 OMAP_MMC_READ(host, RSP2) |
575 (OMAP_MMC_READ(host, RSP3) << 16);
576 cmd->resp[1] =
577 OMAP_MMC_READ(host, RSP4) |
578 (OMAP_MMC_READ(host, RSP5) << 16);
579 cmd->resp[0] =
580 OMAP_MMC_READ(host, RSP6) |
581 (OMAP_MMC_READ(host, RSP7) << 16);
582 } else {
583 /* response types 1, 1b, 3, 4, 5, 6 */
584 cmd->resp[0] =
585 OMAP_MMC_READ(host, RSP6) |
586 (OMAP_MMC_READ(host, RSP7) << 16);
587 }
588 }
589
590 if (host->data == NULL || cmd->error) {
591 struct mmc_host *mmc;
592
593 if (host->data != NULL)
594 mmc_omap_abort_xfer(host, host->data);
595 host->mrq = NULL;
596 mmc = host->mmc;
597 mmc_omap_release_slot(host->current_slot, 1);
598 mmc_request_done(mmc, cmd->mrq);
599 }
600 }
601
602 /*
603 * Abort stuck command. Can occur when card is removed while it is being
604 * read.
605 */
606 static void mmc_omap_abort_command(struct work_struct *work)
607 {
608 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
609 cmd_abort_work);
610 BUG_ON(!host->cmd);
611
612 dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n",
613 host->cmd->opcode);
614
615 if (host->cmd->error == 0)
616 host->cmd->error = -ETIMEDOUT;
617
618 if (host->data == NULL) {
619 struct mmc_command *cmd;
620 struct mmc_host *mmc;
621
622 cmd = host->cmd;
623 host->cmd = NULL;
624 mmc_omap_send_abort(host, 10000);
625
626 host->mrq = NULL;
627 mmc = host->mmc;
628 mmc_omap_release_slot(host->current_slot, 1);
629 mmc_request_done(mmc, cmd->mrq);
630 } else
631 mmc_omap_cmd_done(host, host->cmd);
632
633 host->abort = 0;
634 enable_irq(host->irq);
635 }
636
637 static void
638 mmc_omap_cmd_timer(unsigned long data)
639 {
640 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
641 unsigned long flags;
642
643 spin_lock_irqsave(&host->slot_lock, flags);
644 if (host->cmd != NULL && !host->abort) {
645 OMAP_MMC_WRITE(host, IE, 0);
646 disable_irq(host->irq);
647 host->abort = 1;
648 queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
649 }
650 spin_unlock_irqrestore(&host->slot_lock, flags);
651 }
652
653 /* PIO only */
654 static void
655 mmc_omap_sg_to_buf(struct mmc_omap_host *host)
656 {
657 struct scatterlist *sg;
658
659 sg = host->data->sg + host->sg_idx;
660 host->buffer_bytes_left = sg->length;
661 host->buffer = sg_virt(sg);
662 if (host->buffer_bytes_left > host->total_bytes_left)
663 host->buffer_bytes_left = host->total_bytes_left;
664 }
665
666 static void
667 mmc_omap_clk_timer(unsigned long data)
668 {
669 struct mmc_omap_host *host = (struct mmc_omap_host *) data;
670
671 mmc_omap_fclk_enable(host, 0);
672 }
673
674 /* PIO only */
675 static void
676 mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
677 {
678 int n, nwords;
679
680 if (host->buffer_bytes_left == 0) {
681 host->sg_idx++;
682 BUG_ON(host->sg_idx == host->sg_len);
683 mmc_omap_sg_to_buf(host);
684 }
685 n = 64;
686 if (n > host->buffer_bytes_left)
687 n = host->buffer_bytes_left;
688
689 nwords = n / 2;
690 nwords += n & 1; /* handle odd number of bytes to transfer */
691
692 host->buffer_bytes_left -= n;
693 host->total_bytes_left -= n;
694 host->data->bytes_xfered += n;
695
696 if (write) {
697 __raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA),
698 host->buffer, nwords);
699 } else {
700 __raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA),
701 host->buffer, nwords);
702 }
703
704 host->buffer += nwords;
705 }
706
707 #ifdef CONFIG_MMC_DEBUG
708 static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
709 {
710 static const char *mmc_omap_status_bits[] = {
711 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO",
712 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR"
713 };
714 int i;
715 char res[64], *buf = res;
716
717 buf += sprintf(buf, "MMC IRQ 0x%x:", status);
718
719 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++)
720 if (status & (1 << i))
721 buf += sprintf(buf, " %s", mmc_omap_status_bits[i]);
722 dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
723 }
724 #else
725 static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
726 {
727 }
728 #endif
729
730
731 static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
732 {
733 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id;
734 u16 status;
735 int end_command;
736 int end_transfer;
737 int transfer_error, cmd_error;
738
739 if (host->cmd == NULL && host->data == NULL) {
740 status = OMAP_MMC_READ(host, STAT);
741 dev_info(mmc_dev(host->slots[0]->mmc),
742 "Spurious IRQ 0x%04x\n", status);
743 if (status != 0) {
744 OMAP_MMC_WRITE(host, STAT, status);
745 OMAP_MMC_WRITE(host, IE, 0);
746 }
747 return IRQ_HANDLED;
748 }
749
750 end_command = 0;
751 end_transfer = 0;
752 transfer_error = 0;
753 cmd_error = 0;
754
755 while ((status = OMAP_MMC_READ(host, STAT)) != 0) {
756 int cmd;
757
758 OMAP_MMC_WRITE(host, STAT, status);
759 if (host->cmd != NULL)
760 cmd = host->cmd->opcode;
761 else
762 cmd = -1;
763 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ",
764 status, cmd);
765 mmc_omap_report_irq(host, status);
766
767 if (host->total_bytes_left) {
768 if ((status & OMAP_MMC_STAT_A_FULL) ||
769 (status & OMAP_MMC_STAT_END_OF_DATA))
770 mmc_omap_xfer_data(host, 0);
771 if (status & OMAP_MMC_STAT_A_EMPTY)
772 mmc_omap_xfer_data(host, 1);
773 }
774
775 if (status & OMAP_MMC_STAT_END_OF_DATA)
776 end_transfer = 1;
777
778 if (status & OMAP_MMC_STAT_DATA_TOUT) {
779 dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n",
780 cmd);
781 if (host->data) {
782 host->data->error = -ETIMEDOUT;
783 transfer_error = 1;
784 }
785 }
786
787 if (status & OMAP_MMC_STAT_DATA_CRC) {
788 if (host->data) {
789 host->data->error = -EILSEQ;
790 dev_dbg(mmc_dev(host->mmc),
791 "data CRC error, bytes left %d\n",
792 host->total_bytes_left);
793 transfer_error = 1;
794 } else {
795 dev_dbg(mmc_dev(host->mmc), "data CRC error\n");
796 }
797 }
798
799 if (status & OMAP_MMC_STAT_CMD_TOUT) {
800 /* Timeouts are routine with some commands */
801 if (host->cmd) {
802 struct mmc_omap_slot *slot =
803 host->current_slot;
804 if (slot == NULL ||
805 !mmc_omap_cover_is_open(slot))
806 dev_err(mmc_dev(host->mmc),
807 "command timeout (CMD%d)\n",
808 cmd);
809 host->cmd->error = -ETIMEDOUT;
810 end_command = 1;
811 cmd_error = 1;
812 }
813 }
814
815 if (status & OMAP_MMC_STAT_CMD_CRC) {
816 if (host->cmd) {
817 dev_err(mmc_dev(host->mmc),
818 "command CRC error (CMD%d, arg 0x%08x)\n",
819 cmd, host->cmd->arg);
820 host->cmd->error = -EILSEQ;
821 end_command = 1;
822 cmd_error = 1;
823 } else
824 dev_err(mmc_dev(host->mmc),
825 "command CRC error without cmd?\n");
826 }
827
828 if (status & OMAP_MMC_STAT_CARD_ERR) {
829 dev_dbg(mmc_dev(host->mmc),
830 "ignoring card status error (CMD%d)\n",
831 cmd);
832 end_command = 1;
833 }
834
835 /*
836 * NOTE: On 1610 the END_OF_CMD may come too early when
837 * starting a write
838 */
839 if ((status & OMAP_MMC_STAT_END_OF_CMD) &&
840 (!(status & OMAP_MMC_STAT_A_EMPTY))) {
841 end_command = 1;
842 }
843 }
844
845 if (cmd_error && host->data) {
846 del_timer(&host->cmd_abort_timer);
847 host->abort = 1;
848 OMAP_MMC_WRITE(host, IE, 0);
849 disable_irq_nosync(host->irq);
850 queue_work(host->mmc_omap_wq, &host->cmd_abort_work);
851 return IRQ_HANDLED;
852 }
853
854 if (end_command && host->cmd)
855 mmc_omap_cmd_done(host, host->cmd);
856 if (host->data != NULL) {
857 if (transfer_error)
858 mmc_omap_xfer_done(host, host->data);
859 else if (end_transfer)
860 mmc_omap_end_of_data(host, host->data);
861 }
862
863 return IRQ_HANDLED;
864 }
865
866 void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed)
867 {
868 int cover_open;
869 struct mmc_omap_host *host = dev_get_drvdata(dev);
870 struct mmc_omap_slot *slot = host->slots[num];
871
872 BUG_ON(num >= host->nr_slots);
873
874 /* Other subsystems can call in here before we're initialised. */
875 if (host->nr_slots == 0 || !host->slots[num])
876 return;
877
878 cover_open = mmc_omap_cover_is_open(slot);
879 if (cover_open != slot->cover_open) {
880 slot->cover_open = cover_open;
881 sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
882 }
883
884 tasklet_hi_schedule(&slot->cover_tasklet);
885 }
886
887 static void mmc_omap_cover_timer(unsigned long arg)
888 {
889 struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
890 tasklet_schedule(&slot->cover_tasklet);
891 }
892
893 static void mmc_omap_cover_handler(unsigned long param)
894 {
895 struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param;
896 int cover_open = mmc_omap_cover_is_open(slot);
897
898 mmc_detect_change(slot->mmc, 0);
899 if (!cover_open)
900 return;
901
902 /*
903 * If no card is inserted, we postpone polling until
904 * the cover has been closed.
905 */
906 if (slot->mmc->card == NULL || !mmc_card_present(slot->mmc->card))
907 return;
908
909 mod_timer(&slot->cover_timer,
910 jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY));
911 }
912
913 static void mmc_omap_dma_callback(void *priv)
914 {
915 struct mmc_omap_host *host = priv;
916 struct mmc_data *data = host->data;
917
918 /* If we got to the end of DMA, assume everything went well */
919 data->bytes_xfered += data->blocks * data->blksz;
920
921 mmc_omap_dma_done(host, data);
922 }
923
924 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req)
925 {
926 u16 reg;
927
928 reg = OMAP_MMC_READ(host, SDIO);
929 reg &= ~(1 << 5);
930 OMAP_MMC_WRITE(host, SDIO, reg);
931 /* Set maximum timeout */
932 OMAP_MMC_WRITE(host, CTO, 0xff);
933 }
934
935 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req)
936 {
937 unsigned int timeout, cycle_ns;
938 u16 reg;
939
940 cycle_ns = 1000000000 / host->current_slot->fclk_freq;
941 timeout = req->data->timeout_ns / cycle_ns;
942 timeout += req->data->timeout_clks;
943
944 /* Check if we need to use timeout multiplier register */
945 reg = OMAP_MMC_READ(host, SDIO);
946 if (timeout > 0xffff) {
947 reg |= (1 << 5);
948 timeout /= 1024;
949 } else
950 reg &= ~(1 << 5);
951 OMAP_MMC_WRITE(host, SDIO, reg);
952 OMAP_MMC_WRITE(host, DTO, timeout);
953 }
954
955 static void
956 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req)
957 {
958 struct mmc_data *data = req->data;
959 int i, use_dma, block_size;
960 unsigned sg_len;
961
962 host->data = data;
963 if (data == NULL) {
964 OMAP_MMC_WRITE(host, BLEN, 0);
965 OMAP_MMC_WRITE(host, NBLK, 0);
966 OMAP_MMC_WRITE(host, BUF, 0);
967 host->dma_in_use = 0;
968 set_cmd_timeout(host, req);
969 return;
970 }
971
972 block_size = data->blksz;
973
974 OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
975 OMAP_MMC_WRITE(host, BLEN, block_size - 1);
976 set_data_timeout(host, req);
977
978 /* cope with calling layer confusion; it issues "single
979 * block" writes using multi-block scatterlists.
980 */
981 sg_len = (data->blocks == 1) ? 1 : data->sg_len;
982
983 /* Only do DMA for entire blocks */
984 use_dma = host->use_dma;
985 if (use_dma) {
986 for (i = 0; i < sg_len; i++) {
987 if ((data->sg[i].length % block_size) != 0) {
988 use_dma = 0;
989 break;
990 }
991 }
992 }
993
994 host->sg_idx = 0;
995 if (use_dma) {
996 enum dma_data_direction dma_data_dir;
997 struct dma_async_tx_descriptor *tx;
998 struct dma_chan *c;
999 u32 burst, *bp;
1000 u16 buf;
1001
1002 /*
1003 * FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx
1004 * and 24xx. Use 16 or 32 word frames when the
1005 * blocksize is at least that large. Blocksize is
1006 * usually 512 bytes; but not for some SD reads.
1007 */
1008 burst = mmc_omap15xx() ? 32 : 64;
1009 if (burst > data->blksz)
1010 burst = data->blksz;
1011
1012 burst >>= 1;
1013
1014 if (data->flags & MMC_DATA_WRITE) {
1015 c = host->dma_tx;
1016 bp = &host->dma_tx_burst;
1017 buf = 0x0f80 | (burst - 1) << 0;
1018 dma_data_dir = DMA_TO_DEVICE;
1019 } else {
1020 c = host->dma_rx;
1021 bp = &host->dma_rx_burst;
1022 buf = 0x800f | (burst - 1) << 8;
1023 dma_data_dir = DMA_FROM_DEVICE;
1024 }
1025
1026 if (!c)
1027 goto use_pio;
1028
1029 /* Only reconfigure if we have a different burst size */
1030 if (*bp != burst) {
1031 struct dma_slave_config cfg;
1032
1033 cfg.src_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1034 cfg.dst_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1035 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1036 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1037 cfg.src_maxburst = burst;
1038 cfg.dst_maxburst = burst;
1039
1040 if (dmaengine_slave_config(c, &cfg))
1041 goto use_pio;
1042
1043 *bp = burst;
1044 }
1045
1046 host->sg_len = dma_map_sg(c->device->dev, data->sg, sg_len,
1047 dma_data_dir);
1048 if (host->sg_len == 0)
1049 goto use_pio;
1050
1051 tx = dmaengine_prep_slave_sg(c, data->sg, host->sg_len,
1052 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1053 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1054 if (!tx)
1055 goto use_pio;
1056
1057 OMAP_MMC_WRITE(host, BUF, buf);
1058
1059 tx->callback = mmc_omap_dma_callback;
1060 tx->callback_param = host;
1061 dmaengine_submit(tx);
1062 host->brs_received = 0;
1063 host->dma_done = 0;
1064 host->dma_in_use = 1;
1065 return;
1066 }
1067 use_pio:
1068
1069 /* Revert to PIO? */
1070 OMAP_MMC_WRITE(host, BUF, 0x1f1f);
1071 host->total_bytes_left = data->blocks * block_size;
1072 host->sg_len = sg_len;
1073 mmc_omap_sg_to_buf(host);
1074 host->dma_in_use = 0;
1075 }
1076
1077 static void mmc_omap_start_request(struct mmc_omap_host *host,
1078 struct mmc_request *req)
1079 {
1080 BUG_ON(host->mrq != NULL);
1081
1082 host->mrq = req;
1083
1084 /* only touch fifo AFTER the controller readies it */
1085 mmc_omap_prepare_data(host, req);
1086 mmc_omap_start_command(host, req->cmd);
1087 if (host->dma_in_use) {
1088 struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ?
1089 host->dma_tx : host->dma_rx;
1090
1091 dma_async_issue_pending(c);
1092 }
1093 }
1094
1095 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
1096 {
1097 struct mmc_omap_slot *slot = mmc_priv(mmc);
1098 struct mmc_omap_host *host = slot->host;
1099 unsigned long flags;
1100
1101 spin_lock_irqsave(&host->slot_lock, flags);
1102 if (host->mmc != NULL) {
1103 BUG_ON(slot->mrq != NULL);
1104 slot->mrq = req;
1105 spin_unlock_irqrestore(&host->slot_lock, flags);
1106 return;
1107 } else
1108 host->mmc = mmc;
1109 spin_unlock_irqrestore(&host->slot_lock, flags);
1110 mmc_omap_select_slot(slot, 1);
1111 mmc_omap_start_request(host, req);
1112 }
1113
1114 static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
1115 int vdd)
1116 {
1117 struct mmc_omap_host *host;
1118
1119 host = slot->host;
1120
1121 if (slot->pdata->set_power != NULL)
1122 slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
1123 vdd);
1124 if (mmc_omap2()) {
1125 u16 w;
1126
1127 if (power_on) {
1128 w = OMAP_MMC_READ(host, CON);
1129 OMAP_MMC_WRITE(host, CON, w | (1 << 11));
1130 } else {
1131 w = OMAP_MMC_READ(host, CON);
1132 OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
1133 }
1134 }
1135 }
1136
1137 static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
1138 {
1139 struct mmc_omap_slot *slot = mmc_priv(mmc);
1140 struct mmc_omap_host *host = slot->host;
1141 int func_clk_rate = clk_get_rate(host->fclk);
1142 int dsor;
1143
1144 if (ios->clock == 0)
1145 return 0;
1146
1147 dsor = func_clk_rate / ios->clock;
1148 if (dsor < 1)
1149 dsor = 1;
1150
1151 if (func_clk_rate / dsor > ios->clock)
1152 dsor++;
1153
1154 if (dsor > 250)
1155 dsor = 250;
1156
1157 slot->fclk_freq = func_clk_rate / dsor;
1158
1159 if (ios->bus_width == MMC_BUS_WIDTH_4)
1160 dsor |= 1 << 15;
1161
1162 return dsor;
1163 }
1164
1165 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1166 {
1167 struct mmc_omap_slot *slot = mmc_priv(mmc);
1168 struct mmc_omap_host *host = slot->host;
1169 int i, dsor;
1170 int clk_enabled;
1171
1172 mmc_omap_select_slot(slot, 0);
1173
1174 dsor = mmc_omap_calc_divisor(mmc, ios);
1175
1176 if (ios->vdd != slot->vdd)
1177 slot->vdd = ios->vdd;
1178
1179 clk_enabled = 0;
1180 switch (ios->power_mode) {
1181 case MMC_POWER_OFF:
1182 mmc_omap_set_power(slot, 0, ios->vdd);
1183 break;
1184 case MMC_POWER_UP:
1185 /* Cannot touch dsor yet, just power up MMC */
1186 mmc_omap_set_power(slot, 1, ios->vdd);
1187 goto exit;
1188 case MMC_POWER_ON:
1189 mmc_omap_fclk_enable(host, 1);
1190 clk_enabled = 1;
1191 dsor |= 1 << 11;
1192 break;
1193 }
1194
1195 if (slot->bus_mode != ios->bus_mode) {
1196 if (slot->pdata->set_bus_mode != NULL)
1197 slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
1198 ios->bus_mode);
1199 slot->bus_mode = ios->bus_mode;
1200 }
1201
1202 /* On insanely high arm_per frequencies something sometimes
1203 * goes somehow out of sync, and the POW bit is not being set,
1204 * which results in the while loop below getting stuck.
1205 * Writing to the CON register twice seems to do the trick. */
1206 for (i = 0; i < 2; i++)
1207 OMAP_MMC_WRITE(host, CON, dsor);
1208 slot->saved_con = dsor;
1209 if (ios->power_mode == MMC_POWER_ON) {
1210 /* worst case at 400kHz, 80 cycles makes 200 microsecs */
1211 int usecs = 250;
1212
1213 /* Send clock cycles, poll completion */
1214 OMAP_MMC_WRITE(host, IE, 0);
1215 OMAP_MMC_WRITE(host, STAT, 0xffff);
1216 OMAP_MMC_WRITE(host, CMD, 1 << 7);
1217 while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
1218 udelay(1);
1219 usecs--;
1220 }
1221 OMAP_MMC_WRITE(host, STAT, 1);
1222 }
1223
1224 exit:
1225 mmc_omap_release_slot(slot, clk_enabled);
1226 }
1227
1228 static const struct mmc_host_ops mmc_omap_ops = {
1229 .request = mmc_omap_request,
1230 .set_ios = mmc_omap_set_ios,
1231 };
1232
1233 static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
1234 {
1235 struct mmc_omap_slot *slot = NULL;
1236 struct mmc_host *mmc;
1237 int r;
1238
1239 mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
1240 if (mmc == NULL)
1241 return -ENOMEM;
1242
1243 slot = mmc_priv(mmc);
1244 slot->host = host;
1245 slot->mmc = mmc;
1246 slot->id = id;
1247 slot->pdata = &host->pdata->slots[id];
1248
1249 host->slots[id] = slot;
1250
1251 mmc->caps = 0;
1252 if (host->pdata->slots[id].wires >= 4)
1253 mmc->caps |= MMC_CAP_4_BIT_DATA;
1254
1255 mmc->ops = &mmc_omap_ops;
1256 mmc->f_min = 400000;
1257
1258 if (mmc_omap2())
1259 mmc->f_max = 48000000;
1260 else
1261 mmc->f_max = 24000000;
1262 if (host->pdata->max_freq)
1263 mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
1264 mmc->ocr_avail = slot->pdata->ocr_mask;
1265
1266 /* Use scatterlist DMA to reduce per-transfer costs.
1267 * NOTE max_seg_size assumption that small blocks aren't
1268 * normally used (except e.g. for reading SD registers).
1269 */
1270 mmc->max_segs = 32;
1271 mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */
1272 mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */
1273 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1274 mmc->max_seg_size = mmc->max_req_size;
1275
1276 r = mmc_add_host(mmc);
1277 if (r < 0)
1278 goto err_remove_host;
1279
1280 if (slot->pdata->name != NULL) {
1281 r = device_create_file(&mmc->class_dev,
1282 &dev_attr_slot_name);
1283 if (r < 0)
1284 goto err_remove_host;
1285 }
1286
1287 if (slot->pdata->get_cover_state != NULL) {
1288 r = device_create_file(&mmc->class_dev,
1289 &dev_attr_cover_switch);
1290 if (r < 0)
1291 goto err_remove_slot_name;
1292
1293 setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
1294 (unsigned long)slot);
1295 tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
1296 (unsigned long)slot);
1297 tasklet_schedule(&slot->cover_tasklet);
1298 }
1299
1300 return 0;
1301
1302 err_remove_slot_name:
1303 if (slot->pdata->name != NULL)
1304 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1305 err_remove_host:
1306 mmc_remove_host(mmc);
1307 mmc_free_host(mmc);
1308 return r;
1309 }
1310
1311 static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
1312 {
1313 struct mmc_host *mmc = slot->mmc;
1314
1315 if (slot->pdata->name != NULL)
1316 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1317 if (slot->pdata->get_cover_state != NULL)
1318 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1319
1320 tasklet_kill(&slot->cover_tasklet);
1321 del_timer_sync(&slot->cover_timer);
1322 flush_workqueue(slot->host->mmc_omap_wq);
1323
1324 mmc_remove_host(mmc);
1325 mmc_free_host(mmc);
1326 }
1327
1328 static int mmc_omap_probe(struct platform_device *pdev)
1329 {
1330 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1331 struct mmc_omap_host *host = NULL;
1332 struct resource *res;
1333 dma_cap_mask_t mask;
1334 unsigned sig;
1335 int i, ret = 0;
1336 int irq;
1337
1338 if (pdata == NULL) {
1339 dev_err(&pdev->dev, "platform data missing\n");
1340 return -ENXIO;
1341 }
1342 if (pdata->nr_slots == 0) {
1343 dev_err(&pdev->dev, "no slots\n");
1344 return -ENXIO;
1345 }
1346
1347 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1348 irq = platform_get_irq(pdev, 0);
1349 if (res == NULL || irq < 0)
1350 return -ENXIO;
1351
1352 res = request_mem_region(res->start, resource_size(res),
1353 pdev->name);
1354 if (res == NULL)
1355 return -EBUSY;
1356
1357 host = kzalloc(sizeof(struct mmc_omap_host), GFP_KERNEL);
1358 if (host == NULL) {
1359 ret = -ENOMEM;
1360 goto err_free_mem_region;
1361 }
1362
1363 INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
1364 INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
1365
1366 INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
1367 setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
1368 (unsigned long) host);
1369
1370 spin_lock_init(&host->clk_lock);
1371 setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
1372
1373 spin_lock_init(&host->dma_lock);
1374 spin_lock_init(&host->slot_lock);
1375 init_waitqueue_head(&host->slot_wq);
1376
1377 host->pdata = pdata;
1378 host->features = host->pdata->slots[0].features;
1379 host->dev = &pdev->dev;
1380 platform_set_drvdata(pdev, host);
1381
1382 host->id = pdev->id;
1383 host->mem_res = res;
1384 host->irq = irq;
1385 host->use_dma = 1;
1386 host->irq = irq;
1387 host->phys_base = host->mem_res->start;
1388 host->virt_base = ioremap(res->start, resource_size(res));
1389 if (!host->virt_base)
1390 goto err_ioremap;
1391
1392 host->iclk = clk_get(&pdev->dev, "ick");
1393 if (IS_ERR(host->iclk)) {
1394 ret = PTR_ERR(host->iclk);
1395 goto err_free_mmc_host;
1396 }
1397 clk_enable(host->iclk);
1398
1399 host->fclk = clk_get(&pdev->dev, "fck");
1400 if (IS_ERR(host->fclk)) {
1401 ret = PTR_ERR(host->fclk);
1402 goto err_free_iclk;
1403 }
1404
1405 dma_cap_zero(mask);
1406 dma_cap_set(DMA_SLAVE, mask);
1407
1408 host->dma_tx_burst = -1;
1409 host->dma_rx_burst = -1;
1410
1411 if (mmc_omap2())
1412 sig = host->id == 0 ? OMAP24XX_DMA_MMC1_TX : OMAP24XX_DMA_MMC2_TX;
1413 else
1414 sig = host->id == 0 ? OMAP_DMA_MMC_TX : OMAP_DMA_MMC2_TX;
1415 host->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
1416 if (!host->dma_tx)
1417 dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
1418 sig);
1419 if (mmc_omap2())
1420 sig = host->id == 0 ? OMAP24XX_DMA_MMC1_RX : OMAP24XX_DMA_MMC2_RX;
1421 else
1422 sig = host->id == 0 ? OMAP_DMA_MMC_RX : OMAP_DMA_MMC2_RX;
1423 host->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
1424 if (!host->dma_rx)
1425 dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
1426 sig);
1427
1428 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1429 if (ret)
1430 goto err_free_dma;
1431
1432 if (pdata->init != NULL) {
1433 ret = pdata->init(&pdev->dev);
1434 if (ret < 0)
1435 goto err_free_irq;
1436 }
1437
1438 host->nr_slots = pdata->nr_slots;
1439 host->reg_shift = (mmc_omap7xx() ? 1 : 2);
1440
1441 host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
1442 if (!host->mmc_omap_wq)
1443 goto err_plat_cleanup;
1444
1445 for (i = 0; i < pdata->nr_slots; i++) {
1446 ret = mmc_omap_new_slot(host, i);
1447 if (ret < 0) {
1448 while (--i >= 0)
1449 mmc_omap_remove_slot(host->slots[i]);
1450
1451 goto err_destroy_wq;
1452 }
1453 }
1454
1455 return 0;
1456
1457 err_destroy_wq:
1458 destroy_workqueue(host->mmc_omap_wq);
1459 err_plat_cleanup:
1460 if (pdata->cleanup)
1461 pdata->cleanup(&pdev->dev);
1462 err_free_irq:
1463 free_irq(host->irq, host);
1464 err_free_dma:
1465 if (host->dma_tx)
1466 dma_release_channel(host->dma_tx);
1467 if (host->dma_rx)
1468 dma_release_channel(host->dma_rx);
1469 clk_put(host->fclk);
1470 err_free_iclk:
1471 clk_disable(host->iclk);
1472 clk_put(host->iclk);
1473 err_free_mmc_host:
1474 iounmap(host->virt_base);
1475 err_ioremap:
1476 kfree(host);
1477 err_free_mem_region:
1478 release_mem_region(res->start, resource_size(res));
1479 return ret;
1480 }
1481
1482 static int mmc_omap_remove(struct platform_device *pdev)
1483 {
1484 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1485 int i;
1486
1487 BUG_ON(host == NULL);
1488
1489 for (i = 0; i < host->nr_slots; i++)
1490 mmc_omap_remove_slot(host->slots[i]);
1491
1492 if (host->pdata->cleanup)
1493 host->pdata->cleanup(&pdev->dev);
1494
1495 mmc_omap_fclk_enable(host, 0);
1496 free_irq(host->irq, host);
1497 clk_put(host->fclk);
1498 clk_disable(host->iclk);
1499 clk_put(host->iclk);
1500
1501 if (host->dma_tx)
1502 dma_release_channel(host->dma_tx);
1503 if (host->dma_rx)
1504 dma_release_channel(host->dma_rx);
1505
1506 iounmap(host->virt_base);
1507 release_mem_region(pdev->resource[0].start,
1508 pdev->resource[0].end - pdev->resource[0].start + 1);
1509 destroy_workqueue(host->mmc_omap_wq);
1510
1511 kfree(host);
1512
1513 return 0;
1514 }
1515
1516 #ifdef CONFIG_PM
1517 static int mmc_omap_suspend(struct platform_device *pdev, pm_message_t mesg)
1518 {
1519 int i, ret = 0;
1520 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1521
1522 if (host == NULL || host->suspended)
1523 return 0;
1524
1525 for (i = 0; i < host->nr_slots; i++) {
1526 struct mmc_omap_slot *slot;
1527
1528 slot = host->slots[i];
1529 ret = mmc_suspend_host(slot->mmc);
1530 if (ret < 0) {
1531 while (--i >= 0) {
1532 slot = host->slots[i];
1533 mmc_resume_host(slot->mmc);
1534 }
1535 return ret;
1536 }
1537 }
1538 host->suspended = 1;
1539 return 0;
1540 }
1541
1542 static int mmc_omap_resume(struct platform_device *pdev)
1543 {
1544 int i, ret = 0;
1545 struct mmc_omap_host *host = platform_get_drvdata(pdev);
1546
1547 if (host == NULL || !host->suspended)
1548 return 0;
1549
1550 for (i = 0; i < host->nr_slots; i++) {
1551 struct mmc_omap_slot *slot;
1552 slot = host->slots[i];
1553 ret = mmc_resume_host(slot->mmc);
1554 if (ret < 0)
1555 return ret;
1556
1557 host->suspended = 0;
1558 }
1559 return 0;
1560 }
1561 #else
1562 #define mmc_omap_suspend NULL
1563 #define mmc_omap_resume NULL
1564 #endif
1565
1566 static struct platform_driver mmc_omap_driver = {
1567 .probe = mmc_omap_probe,
1568 .remove = mmc_omap_remove,
1569 .suspend = mmc_omap_suspend,
1570 .resume = mmc_omap_resume,
1571 .driver = {
1572 .name = DRIVER_NAME,
1573 .owner = THIS_MODULE,
1574 },
1575 };
1576
1577 module_platform_driver(mmc_omap_driver);
1578 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1579 MODULE_LICENSE("GPL");
1580 MODULE_ALIAS("platform:" DRIVER_NAME);
1581 MODULE_AUTHOR("Juha Yrjölä");
Linux with added FPC-III support