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Linux/drivers/mmc/host/omap.c

  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 
101 struct mmc_omap_host;
102 
103 struct 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 
120 struct 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 
175 static 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 = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq);
181                 ndelay(8 * tick_ns);
182         }
183 }
184 
185 static 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 
200 static 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);
215 no_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 
240 static void mmc_omap_start_request(struct mmc_omap_host *host,
241                                    struct mmc_request *req);
242 
243 static 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 
258 static 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 
300 static inline
301 int 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 
309 static ssize_t
310 mmc_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 
320 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
321 
322 static ssize_t
323 mmc_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 
332 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL);
333 
334 static void
335 mmc_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 
404 static void
405 mmc_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 
430 static 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 = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq);
439         ndelay(8*tick_ns);
440 
441         mmc_omap_start_command(host, data->stop);
442 }
443 
444 static void
445 mmc_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 
472 static void
473 mmc_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 = DIV_ROUND_UP(120 * USEC_PER_SEC, 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         }
497 out:
498         OMAP_MMC_WRITE(host, STAT, stat);
499 }
500 
501 static void
502 mmc_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 
513 static void
514 mmc_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 
534 static void
535 mmc_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 
551 static void
552 mmc_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  */
597 static 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 
628 static void
629 mmc_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 */
645 static void
646 mmc_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 
657 static void
658 mmc_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 */
666 static void
667 mmc_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         /* Round up to handle odd number of bytes to transfer */
681         nwords = DIV_ROUND_UP(n, 2);
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
699 static 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
716 static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status)
717 {
718 }
719 #endif
720 
721 
722 static 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 
857 void 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 
878 static 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 
884 static 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 
904 static 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 
915 static 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 
926 static 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 
946 static void
947 mmc_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         struct scatterlist *sg;
952         unsigned sg_len;
953 
954         host->data = data;
955         if (data == NULL) {
956                 OMAP_MMC_WRITE(host, BLEN, 0);
957                 OMAP_MMC_WRITE(host, NBLK, 0);
958                 OMAP_MMC_WRITE(host, BUF, 0);
959                 host->dma_in_use = 0;
960                 set_cmd_timeout(host, req);
961                 return;
962         }
963 
964         block_size = data->blksz;
965 
966         OMAP_MMC_WRITE(host, NBLK, data->blocks - 1);
967         OMAP_MMC_WRITE(host, BLEN, block_size - 1);
968         set_data_timeout(host, req);
969 
970         /* cope with calling layer confusion; it issues "single
971          * block" writes using multi-block scatterlists.
972          */
973         sg_len = (data->blocks == 1) ? 1 : data->sg_len;
974 
975         /* Only do DMA for entire blocks */
976         for_each_sg(data->sg, sg, sg_len, i) {
977                 if ((sg->length % block_size) != 0) {
978                         use_dma = 0;
979                         break;
980                 }
981         }
982 
983         host->sg_idx = 0;
984         if (use_dma) {
985                 enum dma_data_direction dma_data_dir;
986                 struct dma_async_tx_descriptor *tx;
987                 struct dma_chan *c;
988                 u32 burst, *bp;
989                 u16 buf;
990 
991                 /*
992                  * FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx
993                  * and 24xx. Use 16 or 32 word frames when the
994                  * blocksize is at least that large. Blocksize is
995                  * usually 512 bytes; but not for some SD reads.
996                  */
997                 burst = mmc_omap15xx() ? 32 : 64;
998                 if (burst > data->blksz)
999                         burst = data->blksz;
1000 
1001                 burst >>= 1;
1002 
1003                 if (data->flags & MMC_DATA_WRITE) {
1004                         c = host->dma_tx;
1005                         bp = &host->dma_tx_burst;
1006                         buf = 0x0f80 | (burst - 1) << 0;
1007                         dma_data_dir = DMA_TO_DEVICE;
1008                 } else {
1009                         c = host->dma_rx;
1010                         bp = &host->dma_rx_burst;
1011                         buf = 0x800f | (burst - 1) << 8;
1012                         dma_data_dir = DMA_FROM_DEVICE;
1013                 }
1014 
1015                 if (!c)
1016                         goto use_pio;
1017 
1018                 /* Only reconfigure if we have a different burst size */
1019                 if (*bp != burst) {
1020                         struct dma_slave_config cfg;
1021 
1022                         cfg.src_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1023                         cfg.dst_addr = host->phys_base + OMAP_MMC_REG(host, DATA);
1024                         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1025                         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
1026                         cfg.src_maxburst = burst;
1027                         cfg.dst_maxburst = burst;
1028 
1029                         if (dmaengine_slave_config(c, &cfg))
1030                                 goto use_pio;
1031 
1032                         *bp = burst;
1033                 }
1034 
1035                 host->sg_len = dma_map_sg(c->device->dev, data->sg, sg_len,
1036                                           dma_data_dir);
1037                 if (host->sg_len == 0)
1038                         goto use_pio;
1039 
1040                 tx = dmaengine_prep_slave_sg(c, data->sg, host->sg_len,
1041                         data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1042                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1043                 if (!tx)
1044                         goto use_pio;
1045 
1046                 OMAP_MMC_WRITE(host, BUF, buf);
1047 
1048                 tx->callback = mmc_omap_dma_callback;
1049                 tx->callback_param = host;
1050                 dmaengine_submit(tx);
1051                 host->brs_received = 0;
1052                 host->dma_done = 0;
1053                 host->dma_in_use = 1;
1054                 return;
1055         }
1056  use_pio:
1057 
1058         /* Revert to PIO? */
1059         OMAP_MMC_WRITE(host, BUF, 0x1f1f);
1060         host->total_bytes_left = data->blocks * block_size;
1061         host->sg_len = sg_len;
1062         mmc_omap_sg_to_buf(host);
1063         host->dma_in_use = 0;
1064 }
1065 
1066 static void mmc_omap_start_request(struct mmc_omap_host *host,
1067                                    struct mmc_request *req)
1068 {
1069         BUG_ON(host->mrq != NULL);
1070 
1071         host->mrq = req;
1072 
1073         /* only touch fifo AFTER the controller readies it */
1074         mmc_omap_prepare_data(host, req);
1075         mmc_omap_start_command(host, req->cmd);
1076         if (host->dma_in_use) {
1077                 struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ?
1078                                 host->dma_tx : host->dma_rx;
1079 
1080                 dma_async_issue_pending(c);
1081         }
1082 }
1083 
1084 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
1085 {
1086         struct mmc_omap_slot *slot = mmc_priv(mmc);
1087         struct mmc_omap_host *host = slot->host;
1088         unsigned long flags;
1089 
1090         spin_lock_irqsave(&host->slot_lock, flags);
1091         if (host->mmc != NULL) {
1092                 BUG_ON(slot->mrq != NULL);
1093                 slot->mrq = req;
1094                 spin_unlock_irqrestore(&host->slot_lock, flags);
1095                 return;
1096         } else
1097                 host->mmc = mmc;
1098         spin_unlock_irqrestore(&host->slot_lock, flags);
1099         mmc_omap_select_slot(slot, 1);
1100         mmc_omap_start_request(host, req);
1101 }
1102 
1103 static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on,
1104                                 int vdd)
1105 {
1106         struct mmc_omap_host *host;
1107 
1108         host = slot->host;
1109 
1110         if (slot->pdata->set_power != NULL)
1111                 slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on,
1112                                         vdd);
1113         if (mmc_omap2()) {
1114                 u16 w;
1115 
1116                 if (power_on) {
1117                         w = OMAP_MMC_READ(host, CON);
1118                         OMAP_MMC_WRITE(host, CON, w | (1 << 11));
1119                 } else {
1120                         w = OMAP_MMC_READ(host, CON);
1121                         OMAP_MMC_WRITE(host, CON, w & ~(1 << 11));
1122                 }
1123         }
1124 }
1125 
1126 static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios)
1127 {
1128         struct mmc_omap_slot *slot = mmc_priv(mmc);
1129         struct mmc_omap_host *host = slot->host;
1130         int func_clk_rate = clk_get_rate(host->fclk);
1131         int dsor;
1132 
1133         if (ios->clock == 0)
1134                 return 0;
1135 
1136         dsor = func_clk_rate / ios->clock;
1137         if (dsor < 1)
1138                 dsor = 1;
1139 
1140         if (func_clk_rate / dsor > ios->clock)
1141                 dsor++;
1142 
1143         if (dsor > 250)
1144                 dsor = 250;
1145 
1146         slot->fclk_freq = func_clk_rate / dsor;
1147 
1148         if (ios->bus_width == MMC_BUS_WIDTH_4)
1149                 dsor |= 1 << 15;
1150 
1151         return dsor;
1152 }
1153 
1154 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1155 {
1156         struct mmc_omap_slot *slot = mmc_priv(mmc);
1157         struct mmc_omap_host *host = slot->host;
1158         int i, dsor;
1159         int clk_enabled;
1160 
1161         mmc_omap_select_slot(slot, 0);
1162 
1163         dsor = mmc_omap_calc_divisor(mmc, ios);
1164 
1165         if (ios->vdd != slot->vdd)
1166                 slot->vdd = ios->vdd;
1167 
1168         clk_enabled = 0;
1169         switch (ios->power_mode) {
1170         case MMC_POWER_OFF:
1171                 mmc_omap_set_power(slot, 0, ios->vdd);
1172                 break;
1173         case MMC_POWER_UP:
1174                 /* Cannot touch dsor yet, just power up MMC */
1175                 mmc_omap_set_power(slot, 1, ios->vdd);
1176                 goto exit;
1177         case MMC_POWER_ON:
1178                 mmc_omap_fclk_enable(host, 1);
1179                 clk_enabled = 1;
1180                 dsor |= 1 << 11;
1181                 break;
1182         }
1183 
1184         if (slot->bus_mode != ios->bus_mode) {
1185                 if (slot->pdata->set_bus_mode != NULL)
1186                         slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id,
1187                                                   ios->bus_mode);
1188                 slot->bus_mode = ios->bus_mode;
1189         }
1190 
1191         /* On insanely high arm_per frequencies something sometimes
1192          * goes somehow out of sync, and the POW bit is not being set,
1193          * which results in the while loop below getting stuck.
1194          * Writing to the CON register twice seems to do the trick. */
1195         for (i = 0; i < 2; i++)
1196                 OMAP_MMC_WRITE(host, CON, dsor);
1197         slot->saved_con = dsor;
1198         if (ios->power_mode == MMC_POWER_ON) {
1199                 /* worst case at 400kHz, 80 cycles makes 200 microsecs */
1200                 int usecs = 250;
1201 
1202                 /* Send clock cycles, poll completion */
1203                 OMAP_MMC_WRITE(host, IE, 0);
1204                 OMAP_MMC_WRITE(host, STAT, 0xffff);
1205                 OMAP_MMC_WRITE(host, CMD, 1 << 7);
1206                 while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) {
1207                         udelay(1);
1208                         usecs--;
1209                 }
1210                 OMAP_MMC_WRITE(host, STAT, 1);
1211         }
1212 
1213 exit:
1214         mmc_omap_release_slot(slot, clk_enabled);
1215 }
1216 
1217 static const struct mmc_host_ops mmc_omap_ops = {
1218         .request        = mmc_omap_request,
1219         .set_ios        = mmc_omap_set_ios,
1220 };
1221 
1222 static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
1223 {
1224         struct mmc_omap_slot *slot = NULL;
1225         struct mmc_host *mmc;
1226         int r;
1227 
1228         mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev);
1229         if (mmc == NULL)
1230                 return -ENOMEM;
1231 
1232         slot = mmc_priv(mmc);
1233         slot->host = host;
1234         slot->mmc = mmc;
1235         slot->id = id;
1236         slot->pdata = &host->pdata->slots[id];
1237 
1238         host->slots[id] = slot;
1239 
1240         mmc->caps = 0;
1241         if (host->pdata->slots[id].wires >= 4)
1242                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_ERASE;
1243 
1244         mmc->ops = &mmc_omap_ops;
1245         mmc->f_min = 400000;
1246 
1247         if (mmc_omap2())
1248                 mmc->f_max = 48000000;
1249         else
1250                 mmc->f_max = 24000000;
1251         if (host->pdata->max_freq)
1252                 mmc->f_max = min(host->pdata->max_freq, mmc->f_max);
1253         mmc->ocr_avail = slot->pdata->ocr_mask;
1254 
1255         /* Use scatterlist DMA to reduce per-transfer costs.
1256          * NOTE max_seg_size assumption that small blocks aren't
1257          * normally used (except e.g. for reading SD registers).
1258          */
1259         mmc->max_segs = 32;
1260         mmc->max_blk_size = 2048;       /* BLEN is 11 bits (+1) */
1261         mmc->max_blk_count = 2048;      /* NBLK is 11 bits (+1) */
1262         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1263         mmc->max_seg_size = mmc->max_req_size;
1264 
1265         if (slot->pdata->get_cover_state != NULL) {
1266                 setup_timer(&slot->cover_timer, mmc_omap_cover_timer,
1267                             (unsigned long)slot);
1268                 tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler,
1269                              (unsigned long)slot);
1270         }
1271 
1272         r = mmc_add_host(mmc);
1273         if (r < 0)
1274                 goto err_remove_host;
1275 
1276         if (slot->pdata->name != NULL) {
1277                 r = device_create_file(&mmc->class_dev,
1278                                         &dev_attr_slot_name);
1279                 if (r < 0)
1280                         goto err_remove_host;
1281         }
1282 
1283         if (slot->pdata->get_cover_state != NULL) {
1284                 r = device_create_file(&mmc->class_dev,
1285                                         &dev_attr_cover_switch);
1286                 if (r < 0)
1287                         goto err_remove_slot_name;
1288                 tasklet_schedule(&slot->cover_tasklet);
1289         }
1290 
1291         return 0;
1292 
1293 err_remove_slot_name:
1294         if (slot->pdata->name != NULL)
1295                 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1296 err_remove_host:
1297         mmc_remove_host(mmc);
1298         mmc_free_host(mmc);
1299         return r;
1300 }
1301 
1302 static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
1303 {
1304         struct mmc_host *mmc = slot->mmc;
1305 
1306         if (slot->pdata->name != NULL)
1307                 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
1308         if (slot->pdata->get_cover_state != NULL)
1309                 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1310 
1311         tasklet_kill(&slot->cover_tasklet);
1312         del_timer_sync(&slot->cover_timer);
1313         flush_workqueue(slot->host->mmc_omap_wq);
1314 
1315         mmc_remove_host(mmc);
1316         mmc_free_host(mmc);
1317 }
1318 
1319 static int mmc_omap_probe(struct platform_device *pdev)
1320 {
1321         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1322         struct mmc_omap_host *host = NULL;
1323         struct resource *res;
1324         dma_cap_mask_t mask;
1325         unsigned sig = 0;
1326         int i, ret = 0;
1327         int irq;
1328 
1329         if (pdata == NULL) {
1330                 dev_err(&pdev->dev, "platform data missing\n");
1331                 return -ENXIO;
1332         }
1333         if (pdata->nr_slots == 0) {
1334                 dev_err(&pdev->dev, "no slots\n");
1335                 return -EPROBE_DEFER;
1336         }
1337 
1338         host = devm_kzalloc(&pdev->dev, sizeof(struct mmc_omap_host),
1339                             GFP_KERNEL);
1340         if (host == NULL)
1341                 return -ENOMEM;
1342 
1343         irq = platform_get_irq(pdev, 0);
1344         if (irq < 0)
1345                 return -ENXIO;
1346 
1347         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1348         host->virt_base = devm_ioremap_resource(&pdev->dev, res);
1349         if (IS_ERR(host->virt_base))
1350                 return PTR_ERR(host->virt_base);
1351 
1352         INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work);
1353         INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work);
1354 
1355         INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command);
1356         setup_timer(&host->cmd_abort_timer, mmc_omap_cmd_timer,
1357                     (unsigned long) host);
1358 
1359         spin_lock_init(&host->clk_lock);
1360         setup_timer(&host->clk_timer, mmc_omap_clk_timer, (unsigned long) host);
1361 
1362         spin_lock_init(&host->dma_lock);
1363         spin_lock_init(&host->slot_lock);
1364         init_waitqueue_head(&host->slot_wq);
1365 
1366         host->pdata = pdata;
1367         host->features = host->pdata->slots[0].features;
1368         host->dev = &pdev->dev;
1369         platform_set_drvdata(pdev, host);
1370 
1371         host->id = pdev->id;
1372         host->irq = irq;
1373         host->phys_base = res->start;
1374         host->iclk = clk_get(&pdev->dev, "ick");
1375         if (IS_ERR(host->iclk))
1376                 return PTR_ERR(host->iclk);
1377         clk_enable(host->iclk);
1378 
1379         host->fclk = clk_get(&pdev->dev, "fck");
1380         if (IS_ERR(host->fclk)) {
1381                 ret = PTR_ERR(host->fclk);
1382                 goto err_free_iclk;
1383         }
1384 
1385         dma_cap_zero(mask);
1386         dma_cap_set(DMA_SLAVE, mask);
1387 
1388         host->dma_tx_burst = -1;
1389         host->dma_rx_burst = -1;
1390 
1391         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1392         if (res)
1393                 sig = res->start;
1394         host->dma_tx = dma_request_slave_channel_compat(mask,
1395                                 omap_dma_filter_fn, &sig, &pdev->dev, "tx");
1396         if (!host->dma_tx)
1397                 dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
1398                         sig);
1399 
1400         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1401         if (res)
1402                 sig = res->start;
1403         host->dma_rx = dma_request_slave_channel_compat(mask,
1404                                 omap_dma_filter_fn, &sig, &pdev->dev, "rx");
1405         if (!host->dma_rx)
1406                 dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
1407                         sig);
1408 
1409         ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
1410         if (ret)
1411                 goto err_free_dma;
1412 
1413         if (pdata->init != NULL) {
1414                 ret = pdata->init(&pdev->dev);
1415                 if (ret < 0)
1416                         goto err_free_irq;
1417         }
1418 
1419         host->nr_slots = pdata->nr_slots;
1420         host->reg_shift = (mmc_omap7xx() ? 1 : 2);
1421 
1422         host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0);
1423         if (!host->mmc_omap_wq) {
1424                 ret = -ENOMEM;
1425                 goto err_plat_cleanup;
1426         }
1427 
1428         for (i = 0; i < pdata->nr_slots; i++) {
1429                 ret = mmc_omap_new_slot(host, i);
1430                 if (ret < 0) {
1431                         while (--i >= 0)
1432                                 mmc_omap_remove_slot(host->slots[i]);
1433 
1434                         goto err_destroy_wq;
1435                 }
1436         }
1437 
1438         return 0;
1439 
1440 err_destroy_wq:
1441         destroy_workqueue(host->mmc_omap_wq);
1442 err_plat_cleanup:
1443         if (pdata->cleanup)
1444                 pdata->cleanup(&pdev->dev);
1445 err_free_irq:
1446         free_irq(host->irq, host);
1447 err_free_dma:
1448         if (host->dma_tx)
1449                 dma_release_channel(host->dma_tx);
1450         if (host->dma_rx)
1451                 dma_release_channel(host->dma_rx);
1452         clk_put(host->fclk);
1453 err_free_iclk:
1454         clk_disable(host->iclk);
1455         clk_put(host->iclk);
1456         return ret;
1457 }
1458 
1459 static int mmc_omap_remove(struct platform_device *pdev)
1460 {
1461         struct mmc_omap_host *host = platform_get_drvdata(pdev);
1462         int i;
1463 
1464         BUG_ON(host == NULL);
1465 
1466         for (i = 0; i < host->nr_slots; i++)
1467                 mmc_omap_remove_slot(host->slots[i]);
1468 
1469         if (host->pdata->cleanup)
1470                 host->pdata->cleanup(&pdev->dev);
1471 
1472         mmc_omap_fclk_enable(host, 0);
1473         free_irq(host->irq, host);
1474         clk_put(host->fclk);
1475         clk_disable(host->iclk);
1476         clk_put(host->iclk);
1477 
1478         if (host->dma_tx)
1479                 dma_release_channel(host->dma_tx);
1480         if (host->dma_rx)
1481                 dma_release_channel(host->dma_rx);
1482 
1483         destroy_workqueue(host->mmc_omap_wq);
1484 
1485         return 0;
1486 }
1487 
1488 #if IS_BUILTIN(CONFIG_OF)
1489 static const struct of_device_id mmc_omap_match[] = {
1490         { .compatible = "ti,omap2420-mmc", },
1491         { },
1492 };
1493 MODULE_DEVICE_TABLE(of, mmc_omap_match);
1494 #endif
1495 
1496 static struct platform_driver mmc_omap_driver = {
1497         .probe          = mmc_omap_probe,
1498         .remove         = mmc_omap_remove,
1499         .driver         = {
1500                 .name   = DRIVER_NAME,
1501                 .of_match_table = of_match_ptr(mmc_omap_match),
1502         },
1503 };
1504 
1505 module_platform_driver(mmc_omap_driver);
1506 MODULE_DESCRIPTION("OMAP Multimedia Card driver");
1507 MODULE_LICENSE("GPL");
1508 MODULE_ALIAS("platform:" DRIVER_NAME);
1509 MODULE_AUTHOR("Juha Yrjölä");
1510 

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