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ext4: fix undefined behavior in ext4_fill_flex_info()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mmc / host / omap_hsmmc.c
blob0aecaaebef3d48c40141666f267f8da3fb473a65
1 /*
2 * drivers/mmc/host/omap_hsmmc.c
3 *
4 * Driver for OMAP2430/3430 MMC controller.
5 *
6 * Copyright (C) 2007 Texas Instruments.
7 *
8 * Authors:
9 * Syed Mohammed Khasim <x0khasim@ti.com>
10 * Madhusudhan <madhu.cr@ti.com>
11 * Mohit Jalori <mjalori@ti.com>
12 *
13 * This file is licensed under the terms of the GNU General Public License
14 * version 2. This program is licensed "as is" without any warranty of any
15 * kind, whether express or implied.
16 */
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/interrupt.h>
23 #include <linux/delay.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/platform_device.h>
26 #include <linux/workqueue.h>
27 #include <linux/timer.h>
28 #include <linux/clk.h>
29 #include <linux/mmc/host.h>
30 #include <linux/mmc/core.h>
31 #include <linux/io.h>
32 #include <linux/semaphore.h>
33 #include <mach/dma.h>
34 #include <mach/hardware.h>
35 #include <mach/board.h>
36 #include <mach/mmc.h>
37 #include <mach/cpu.h>
38
39 /* OMAP HSMMC Host Controller Registers */
40 #define OMAP_HSMMC_SYSCONFIG 0x0010
41 #define OMAP_HSMMC_SYSSTATUS 0x0014
42 #define OMAP_HSMMC_CON 0x002C
43 #define OMAP_HSMMC_BLK 0x0104
44 #define OMAP_HSMMC_ARG 0x0108
45 #define OMAP_HSMMC_CMD 0x010C
46 #define OMAP_HSMMC_RSP10 0x0110
47 #define OMAP_HSMMC_RSP32 0x0114
48 #define OMAP_HSMMC_RSP54 0x0118
49 #define OMAP_HSMMC_RSP76 0x011C
50 #define OMAP_HSMMC_DATA 0x0120
51 #define OMAP_HSMMC_HCTL 0x0128
52 #define OMAP_HSMMC_SYSCTL 0x012C
53 #define OMAP_HSMMC_STAT 0x0130
54 #define OMAP_HSMMC_IE 0x0134
55 #define OMAP_HSMMC_ISE 0x0138
56 #define OMAP_HSMMC_CAPA 0x0140
57
58 #define VS18 (1 << 26)
59 #define VS30 (1 << 25)
60 #define SDVS18 (0x5 << 9)
61 #define SDVS30 (0x6 << 9)
62 #define SDVS33 (0x7 << 9)
63 #define SDVS_MASK 0x00000E00
64 #define SDVSCLR 0xFFFFF1FF
65 #define SDVSDET 0x00000400
66 #define AUTOIDLE 0x1
67 #define SDBP (1 << 8)
68 #define DTO 0xe
69 #define ICE 0x1
70 #define ICS 0x2
71 #define CEN (1 << 2)
72 #define CLKD_MASK 0x0000FFC0
73 #define CLKD_SHIFT 6
74 #define DTO_MASK 0x000F0000
75 #define DTO_SHIFT 16
76 #define INT_EN_MASK 0x307F0033
77 #define BWR_ENABLE (1 << 4)
78 #define BRR_ENABLE (1 << 5)
79 #define INIT_STREAM (1 << 1)
80 #define DP_SELECT (1 << 21)
81 #define DDIR (1 << 4)
82 #define DMA_EN 0x1
83 #define MSBS (1 << 5)
84 #define BCE (1 << 1)
85 #define FOUR_BIT (1 << 1)
86 #define DW8 (1 << 5)
87 #define CC 0x1
88 #define TC 0x02
89 #define OD 0x1
90 #define ERR (1 << 15)
91 #define CMD_TIMEOUT (1 << 16)
92 #define DATA_TIMEOUT (1 << 20)
93 #define CMD_CRC (1 << 17)
94 #define DATA_CRC (1 << 21)
95 #define CARD_ERR (1 << 28)
96 #define STAT_CLEAR 0xFFFFFFFF
97 #define INIT_STREAM_CMD 0x00000000
98 #define DUAL_VOLT_OCR_BIT 7
99 #define SRC (1 << 25)
100 #define SRD (1 << 26)
101 #define SOFTRESET (1 << 1)
102 #define RESETDONE (1 << 0)
103
104 /*
105 * FIXME: Most likely all the data using these _DEVID defines should come
106 * from the platform_data, or implemented in controller and slot specific
107 * functions.
108 */
109 #define OMAP_MMC1_DEVID 0
110 #define OMAP_MMC2_DEVID 1
111 #define OMAP_MMC3_DEVID 2
112 #define OMAP_MMC4_DEVID 3
113 #define OMAP_MMC5_DEVID 4
114
115 #define MMC_TIMEOUT_MS 20
116 #define OMAP_MMC_MASTER_CLOCK 96000000
117 #define DRIVER_NAME "mmci-omap-hs"
118
119 /* Timeouts for entering power saving states on inactivity, msec */
120 #define OMAP_MMC_DISABLED_TIMEOUT 100
121 #define OMAP_MMC_SLEEP_TIMEOUT 1000
122 #define OMAP_MMC_OFF_TIMEOUT 8000
123
124 /*
125 * One controller can have multiple slots, like on some omap boards using
126 * omap.c controller driver. Luckily this is not currently done on any known
127 * omap_hsmmc.c device.
128 */
129 #define mmc_slot(host) (host->pdata->slots[host->slot_id])
130
131 /*
132 * MMC Host controller read/write API's
133 */
134 #define OMAP_HSMMC_READ(base, reg) \
135 __raw_readl((base) + OMAP_HSMMC_##reg)
136
137 #define OMAP_HSMMC_WRITE(base, reg, val) \
138 __raw_writel((val), (base) + OMAP_HSMMC_##reg)
139
140 struct omap_hsmmc_host {
141 struct device *dev;
142 struct mmc_host *mmc;
143 struct mmc_request *mrq;
144 struct mmc_command *cmd;
145 struct mmc_data *data;
146 struct clk *fclk;
147 struct clk *iclk;
148 struct clk *dbclk;
149 struct semaphore sem;
150 struct work_struct mmc_carddetect_work;
151 void __iomem *base;
152 resource_size_t mapbase;
153 spinlock_t irq_lock; /* Prevent races with irq handler */
154 unsigned long flags;
155 unsigned int id;
156 unsigned int dma_len;
157 unsigned int dma_sg_idx;
158 unsigned char bus_mode;
159 unsigned char power_mode;
160 u32 *buffer;
161 u32 bytesleft;
162 int suspended;
163 int irq;
164 int use_dma, dma_ch;
165 int dma_line_tx, dma_line_rx;
166 int slot_id;
167 int got_dbclk;
168 int response_busy;
169 int context_loss;
170 int dpm_state;
171 int vdd;
172 int protect_card;
173 int reqs_blocked;
174
175 struct omap_mmc_platform_data *pdata;
176 };
177
178 /*
179 * Stop clock to the card
180 */
181 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
182 {
183 OMAP_HSMMC_WRITE(host->base, SYSCTL,
184 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
185 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
186 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
187 }
188
189 #ifdef CONFIG_PM
190
191 /*
192 * Restore the MMC host context, if it was lost as result of a
193 * power state change.
194 */
195 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
196 {
197 struct mmc_ios *ios = &host->mmc->ios;
198 struct omap_mmc_platform_data *pdata = host->pdata;
199 int context_loss = 0;
200 u32 hctl, capa, con;
201 u16 dsor = 0;
202 unsigned long timeout;
203
204 if (pdata->get_context_loss_count) {
205 context_loss = pdata->get_context_loss_count(host->dev);
206 if (context_loss < 0)
207 return 1;
208 }
209
210 dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
211 context_loss == host->context_loss ? "not " : "");
212 if (host->context_loss == context_loss)
213 return 1;
214
215 /* Wait for hardware reset */
216 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
217 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
218 && time_before(jiffies, timeout))
219 ;
220
221 /* Do software reset */
222 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
223 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
224 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
225 && time_before(jiffies, timeout))
226 ;
227
228 OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
229 OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
230
231 if (host->id == OMAP_MMC1_DEVID) {
232 if (host->power_mode != MMC_POWER_OFF &&
233 (1 << ios->vdd) <= MMC_VDD_23_24)
234 hctl = SDVS18;
235 else
236 hctl = SDVS30;
237 capa = VS30 | VS18;
238 } else {
239 hctl = SDVS18;
240 capa = VS18;
241 }
242
243 OMAP_HSMMC_WRITE(host->base, HCTL,
244 OMAP_HSMMC_READ(host->base, HCTL) | hctl);
245
246 OMAP_HSMMC_WRITE(host->base, CAPA,
247 OMAP_HSMMC_READ(host->base, CAPA) | capa);
248
249 OMAP_HSMMC_WRITE(host->base, HCTL,
250 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
251
252 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
253 while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
254 && time_before(jiffies, timeout))
255 ;
256
257 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
258 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
259 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
260
261 /* Do not initialize card-specific things if the power is off */
262 if (host->power_mode == MMC_POWER_OFF)
263 goto out;
264
265 con = OMAP_HSMMC_READ(host->base, CON);
266 switch (ios->bus_width) {
267 case MMC_BUS_WIDTH_8:
268 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
269 break;
270 case MMC_BUS_WIDTH_4:
271 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
272 OMAP_HSMMC_WRITE(host->base, HCTL,
273 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
274 break;
275 case MMC_BUS_WIDTH_1:
276 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
277 OMAP_HSMMC_WRITE(host->base, HCTL,
278 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
279 break;
280 }
281
282 if (ios->clock) {
283 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
284 if (dsor < 1)
285 dsor = 1;
286
287 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
288 dsor++;
289
290 if (dsor > 250)
291 dsor = 250;
292 }
293
294 OMAP_HSMMC_WRITE(host->base, SYSCTL,
295 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
296 OMAP_HSMMC_WRITE(host->base, SYSCTL, (dsor << 6) | (DTO << 16));
297 OMAP_HSMMC_WRITE(host->base, SYSCTL,
298 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
299
300 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
301 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
302 && time_before(jiffies, timeout))
303 ;
304
305 OMAP_HSMMC_WRITE(host->base, SYSCTL,
306 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
307
308 con = OMAP_HSMMC_READ(host->base, CON);
309 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
310 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
311 else
312 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
313 out:
314 host->context_loss = context_loss;
315
316 dev_dbg(mmc_dev(host->mmc), "context is restored\n");
317 return 0;
318 }
319
320 /*
321 * Save the MMC host context (store the number of power state changes so far).
322 */
323 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
324 {
325 struct omap_mmc_platform_data *pdata = host->pdata;
326 int context_loss;
327
328 if (pdata->get_context_loss_count) {
329 context_loss = pdata->get_context_loss_count(host->dev);
330 if (context_loss < 0)
331 return;
332 host->context_loss = context_loss;
333 }
334 }
335
336 #else
337
338 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
339 {
340 return 0;
341 }
342
343 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
344 {
345 }
346
347 #endif
348
349 /*
350 * Send init stream sequence to card
351 * before sending IDLE command
352 */
353 static void send_init_stream(struct omap_hsmmc_host *host)
354 {
355 int reg = 0;
356 unsigned long timeout;
357
358 if (host->protect_card)
359 return;
360
361 disable_irq(host->irq);
362 OMAP_HSMMC_WRITE(host->base, CON,
363 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
364 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
365
366 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
367 while ((reg != CC) && time_before(jiffies, timeout))
368 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
369
370 OMAP_HSMMC_WRITE(host->base, CON,
371 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
372
373 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
374 OMAP_HSMMC_READ(host->base, STAT);
375
376 enable_irq(host->irq);
377 }
378
379 static inline
380 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
381 {
382 int r = 1;
383
384 if (mmc_slot(host).get_cover_state)
385 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
386 return r;
387 }
388
389 static ssize_t
390 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
391 char *buf)
392 {
393 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
394 struct omap_hsmmc_host *host = mmc_priv(mmc);
395
396 return sprintf(buf, "%s\n",
397 omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
398 }
399
400 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
401
402 static ssize_t
403 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
404 char *buf)
405 {
406 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
407 struct omap_hsmmc_host *host = mmc_priv(mmc);
408
409 return sprintf(buf, "%s\n", mmc_slot(host).name);
410 }
411
412 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
413
414 /*
415 * Configure the response type and send the cmd.
416 */
417 static void
418 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
419 struct mmc_data *data)
420 {
421 int cmdreg = 0, resptype = 0, cmdtype = 0;
422
423 dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
424 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
425 host->cmd = cmd;
426
427 /*
428 * Clear status bits and enable interrupts
429 */
430 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
431 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
432
433 if (host->use_dma)
434 OMAP_HSMMC_WRITE(host->base, IE,
435 INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
436 else
437 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
438
439 host->response_busy = 0;
440 if (cmd->flags & MMC_RSP_PRESENT) {
441 if (cmd->flags & MMC_RSP_136)
442 resptype = 1;
443 else if (cmd->flags & MMC_RSP_BUSY) {
444 resptype = 3;
445 host->response_busy = 1;
446 } else
447 resptype = 2;
448 }
449
450 /*
451 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
452 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
453 * a val of 0x3, rest 0x0.
454 */
455 if (cmd == host->mrq->stop)
456 cmdtype = 0x3;
457
458 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
459
460 if (data) {
461 cmdreg |= DP_SELECT | MSBS | BCE;
462 if (data->flags & MMC_DATA_READ)
463 cmdreg |= DDIR;
464 else
465 cmdreg &= ~(DDIR);
466 }
467
468 if (host->use_dma)
469 cmdreg |= DMA_EN;
470
471 /*
472 * In an interrupt context (i.e. STOP command), the spinlock is unlocked
473 * by the interrupt handler, otherwise (i.e. for a new request) it is
474 * unlocked here.
475 */
476 if (!in_interrupt())
477 spin_unlock_irqrestore(&host->irq_lock, host->flags);
478
479 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
480 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
481 }
482
483 static int
484 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
485 {
486 if (data->flags & MMC_DATA_WRITE)
487 return DMA_TO_DEVICE;
488 else
489 return DMA_FROM_DEVICE;
490 }
491
492 /*
493 * Notify the transfer complete to MMC core
494 */
495 static void
496 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
497 {
498 if (!data) {
499 struct mmc_request *mrq = host->mrq;
500
501 /* TC before CC from CMD6 - don't know why, but it happens */
502 if (host->cmd && host->cmd->opcode == 6 &&
503 host->response_busy) {
504 host->response_busy = 0;
505 return;
506 }
507
508 host->mrq = NULL;
509 mmc_request_done(host->mmc, mrq);
510 return;
511 }
512
513 host->data = NULL;
514
515 if (host->use_dma && host->dma_ch != -1)
516 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
517 omap_hsmmc_get_dma_dir(host, data));
518
519 if (!data->error)
520 data->bytes_xfered += data->blocks * (data->blksz);
521 else
522 data->bytes_xfered = 0;
523
524 if (!data->stop) {
525 host->mrq = NULL;
526 mmc_request_done(host->mmc, data->mrq);
527 return;
528 }
529 omap_hsmmc_start_command(host, data->stop, NULL);
530 }
531
532 /*
533 * Notify the core about command completion
534 */
535 static void
536 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
537 {
538 host->cmd = NULL;
539
540 if (cmd->flags & MMC_RSP_PRESENT) {
541 if (cmd->flags & MMC_RSP_136) {
542 /* response type 2 */
543 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
544 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
545 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
546 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
547 } else {
548 /* response types 1, 1b, 3, 4, 5, 6 */
549 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
550 }
551 }
552 if ((host->data == NULL && !host->response_busy) || cmd->error) {
553 host->mrq = NULL;
554 mmc_request_done(host->mmc, cmd->mrq);
555 }
556 }
557
558 /*
559 * DMA clean up for command errors
560 */
561 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
562 {
563 host->data->error = errno;
564
565 if (host->use_dma && host->dma_ch != -1) {
566 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
567 omap_hsmmc_get_dma_dir(host, host->data));
568 omap_free_dma(host->dma_ch);
569 host->dma_ch = -1;
570 up(&host->sem);
571 }
572 host->data = NULL;
573 }
574
575 /*
576 * Readable error output
577 */
578 #ifdef CONFIG_MMC_DEBUG
579 static void omap_hsmmc_report_irq(struct omap_hsmmc_host *host, u32 status)
580 {
581 /* --- means reserved bit without definition at documentation */
582 static const char *omap_hsmmc_status_bits[] = {
583 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
584 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
585 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
586 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
587 };
588 char res[256];
589 char *buf = res;
590 int len, i;
591
592 len = sprintf(buf, "MMC IRQ 0x%x :", status);
593 buf += len;
594
595 for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
596 if (status & (1 << i)) {
597 len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
598 buf += len;
599 }
600
601 dev_dbg(mmc_dev(host->mmc), "%s\n", res);
602 }
603 #endif /* CONFIG_MMC_DEBUG */
604
605 /*
606 * MMC controller internal state machines reset
607 *
608 * Used to reset command or data internal state machines, using respectively
609 * SRC or SRD bit of SYSCTL register
610 * Can be called from interrupt context
611 */
612 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
613 unsigned long bit)
614 {
615 unsigned long i = 0;
616 unsigned long limit = (loops_per_jiffy *
617 msecs_to_jiffies(MMC_TIMEOUT_MS));
618
619 OMAP_HSMMC_WRITE(host->base, SYSCTL,
620 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
621
622 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
623 (i++ < limit))
624 cpu_relax();
625
626 if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
627 dev_err(mmc_dev(host->mmc),
628 "Timeout waiting on controller reset in %s\n",
629 __func__);
630 }
631
632 /*
633 * MMC controller IRQ handler
634 */
635 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
636 {
637 struct omap_hsmmc_host *host = dev_id;
638 struct mmc_data *data;
639 int end_cmd = 0, end_trans = 0, status;
640
641 spin_lock(&host->irq_lock);
642
643 if (host->mrq == NULL) {
644 OMAP_HSMMC_WRITE(host->base, STAT,
645 OMAP_HSMMC_READ(host->base, STAT));
646 /* Flush posted write */
647 OMAP_HSMMC_READ(host->base, STAT);
648 spin_unlock(&host->irq_lock);
649 return IRQ_HANDLED;
650 }
651
652 data = host->data;
653 status = OMAP_HSMMC_READ(host->base, STAT);
654 dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
655
656 if (status & ERR) {
657 #ifdef CONFIG_MMC_DEBUG
658 omap_hsmmc_report_irq(host, status);
659 #endif
660 if ((status & CMD_TIMEOUT) ||
661 (status & CMD_CRC)) {
662 if (host->cmd) {
663 if (status & CMD_TIMEOUT) {
664 omap_hsmmc_reset_controller_fsm(host,
665 SRC);
666 host->cmd->error = -ETIMEDOUT;
667 } else {
668 host->cmd->error = -EILSEQ;
669 }
670 end_cmd = 1;
671 }
672 if (host->data || host->response_busy) {
673 if (host->data)
674 omap_hsmmc_dma_cleanup(host,
675 -ETIMEDOUT);
676 host->response_busy = 0;
677 omap_hsmmc_reset_controller_fsm(host, SRD);
678 }
679 }
680 if ((status & DATA_TIMEOUT) ||
681 (status & DATA_CRC)) {
682 if (host->data || host->response_busy) {
683 int err = (status & DATA_TIMEOUT) ?
684 -ETIMEDOUT : -EILSEQ;
685
686 if (host->data)
687 omap_hsmmc_dma_cleanup(host, err);
688 else
689 host->mrq->cmd->error = err;
690 host->response_busy = 0;
691 omap_hsmmc_reset_controller_fsm(host, SRD);
692 end_trans = 1;
693 }
694 }
695 if (status & CARD_ERR) {
696 dev_dbg(mmc_dev(host->mmc),
697 "Ignoring card err CMD%d\n", host->cmd->opcode);
698 if (host->cmd)
699 end_cmd = 1;
700 if (host->data)
701 end_trans = 1;
702 }
703 }
704
705 OMAP_HSMMC_WRITE(host->base, STAT, status);
706 /* Flush posted write */
707 OMAP_HSMMC_READ(host->base, STAT);
708
709 if (end_cmd || ((status & CC) && host->cmd))
710 omap_hsmmc_cmd_done(host, host->cmd);
711 if ((end_trans || (status & TC)) && host->mrq)
712 omap_hsmmc_xfer_done(host, data);
713
714 spin_unlock(&host->irq_lock);
715
716 return IRQ_HANDLED;
717 }
718
719 static void set_sd_bus_power(struct omap_hsmmc_host *host)
720 {
721 unsigned long i;
722
723 OMAP_HSMMC_WRITE(host->base, HCTL,
724 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
725 for (i = 0; i < loops_per_jiffy; i++) {
726 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
727 break;
728 cpu_relax();
729 }
730 }
731
732 /*
733 * Switch MMC interface voltage ... only relevant for MMC1.
734 *
735 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
736 * The MMC2 transceiver controls are used instead of DAT4..DAT7.
737 * Some chips, like eMMC ones, use internal transceivers.
738 */
739 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
740 {
741 u32 reg_val = 0;
742 int ret;
743
744 /* Disable the clocks */
745 clk_disable(host->fclk);
746 clk_disable(host->iclk);
747 if (host->got_dbclk)
748 clk_disable(host->dbclk);
749
750 /* Turn the power off */
751 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
752
753 /* Turn the power ON with given VDD 1.8 or 3.0v */
754 if (!ret)
755 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
756 vdd);
757 clk_enable(host->iclk);
758 clk_enable(host->fclk);
759 if (host->got_dbclk)
760 clk_enable(host->dbclk);
761
762 if (ret != 0)
763 goto err;
764
765 OMAP_HSMMC_WRITE(host->base, HCTL,
766 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
767 reg_val = OMAP_HSMMC_READ(host->base, HCTL);
768
769 /*
770 * If a MMC dual voltage card is detected, the set_ios fn calls
771 * this fn with VDD bit set for 1.8V. Upon card removal from the
772 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
773 *
774 * Cope with a bit of slop in the range ... per data sheets:
775 * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
776 * but recommended values are 1.71V to 1.89V
777 * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
778 * but recommended values are 2.7V to 3.3V
779 *
780 * Board setup code shouldn't permit anything very out-of-range.
781 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
782 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
783 */
784 if ((1 << vdd) <= MMC_VDD_23_24)
785 reg_val |= SDVS18;
786 else
787 reg_val |= SDVS30;
788
789 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
790 set_sd_bus_power(host);
791
792 return 0;
793 err:
794 dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
795 return ret;
796 }
797
798 /* Protect the card while the cover is open */
799 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
800 {
801 if (!mmc_slot(host).get_cover_state)
802 return;
803
804 host->reqs_blocked = 0;
805 if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
806 if (host->protect_card) {
807 printk(KERN_INFO "%s: cover is closed, "
808 "card is now accessible\n",
809 mmc_hostname(host->mmc));
810 host->protect_card = 0;
811 }
812 } else {
813 if (!host->protect_card) {
814 printk(KERN_INFO "%s: cover is open, "
815 "card is now inaccessible\n",
816 mmc_hostname(host->mmc));
817 host->protect_card = 1;
818 }
819 }
820 }
821
822 /*
823 * Work Item to notify the core about card insertion/removal
824 */
825 static void omap_hsmmc_detect(struct work_struct *work)
826 {
827 struct omap_hsmmc_host *host =
828 container_of(work, struct omap_hsmmc_host, mmc_carddetect_work);
829 struct omap_mmc_slot_data *slot = &mmc_slot(host);
830 int carddetect;
831
832 if (host->suspended)
833 return;
834
835 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
836
837 if (slot->card_detect)
838 carddetect = slot->card_detect(slot->card_detect_irq);
839 else {
840 omap_hsmmc_protect_card(host);
841 carddetect = -ENOSYS;
842 }
843
844 if (carddetect) {
845 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
846 } else {
847 mmc_host_enable(host->mmc);
848 omap_hsmmc_reset_controller_fsm(host, SRD);
849 mmc_host_lazy_disable(host->mmc);
850
851 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
852 }
853 }
854
855 /*
856 * ISR for handling card insertion and removal
857 */
858 static irqreturn_t omap_hsmmc_cd_handler(int irq, void *dev_id)
859 {
860 struct omap_hsmmc_host *host = (struct omap_hsmmc_host *)dev_id;
861
862 if (host->suspended)
863 return IRQ_HANDLED;
864 schedule_work(&host->mmc_carddetect_work);
865
866 return IRQ_HANDLED;
867 }
868
869 static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
870 struct mmc_data *data)
871 {
872 int sync_dev;
873
874 if (data->flags & MMC_DATA_WRITE)
875 sync_dev = host->dma_line_tx;
876 else
877 sync_dev = host->dma_line_rx;
878 return sync_dev;
879 }
880
881 static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
882 struct mmc_data *data,
883 struct scatterlist *sgl)
884 {
885 int blksz, nblk, dma_ch;
886
887 dma_ch = host->dma_ch;
888 if (data->flags & MMC_DATA_WRITE) {
889 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
890 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
891 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
892 sg_dma_address(sgl), 0, 0);
893 } else {
894 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
895 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
896 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
897 sg_dma_address(sgl), 0, 0);
898 }
899
900 blksz = host->data->blksz;
901 nblk = sg_dma_len(sgl) / blksz;
902
903 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
904 blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
905 omap_hsmmc_get_dma_sync_dev(host, data),
906 !(data->flags & MMC_DATA_WRITE));
907
908 omap_start_dma(dma_ch);
909 }
910
911 /*
912 * DMA call back function
913 */
914 static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *data)
915 {
916 struct omap_hsmmc_host *host = data;
917
918 if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
919 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
920
921 if (host->dma_ch < 0)
922 return;
923
924 host->dma_sg_idx++;
925 if (host->dma_sg_idx < host->dma_len) {
926 /* Fire up the next transfer. */
927 omap_hsmmc_config_dma_params(host, host->data,
928 host->data->sg + host->dma_sg_idx);
929 return;
930 }
931
932 omap_free_dma(host->dma_ch);
933 host->dma_ch = -1;
934 /*
935 * DMA Callback: run in interrupt context.
936 * mutex_unlock will throw a kernel warning if used.
937 */
938 up(&host->sem);
939 }
940
941 /*
942 * Routine to configure and start DMA for the MMC card
943 */
944 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
945 struct mmc_request *req)
946 {
947 int dma_ch = 0, ret = 0, err = 1, i;
948 struct mmc_data *data = req->data;
949
950 /* Sanity check: all the SG entries must be aligned by block size. */
951 for (i = 0; i < data->sg_len; i++) {
952 struct scatterlist *sgl;
953
954 sgl = data->sg + i;
955 if (sgl->length % data->blksz)
956 return -EINVAL;
957 }
958 if ((data->blksz % 4) != 0)
959 /* REVISIT: The MMC buffer increments only when MSB is written.
960 * Return error for blksz which is non multiple of four.
961 */
962 return -EINVAL;
963
964 /*
965 * If for some reason the DMA transfer is still active,
966 * we wait for timeout period and free the dma
967 */
968 if (host->dma_ch != -1) {
969 set_current_state(TASK_UNINTERRUPTIBLE);
970 schedule_timeout(100);
971 if (down_trylock(&host->sem)) {
972 omap_free_dma(host->dma_ch);
973 host->dma_ch = -1;
974 up(&host->sem);
975 return err;
976 }
977 } else {
978 if (down_trylock(&host->sem))
979 return err;
980 }
981
982 ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
983 "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
984 if (ret != 0) {
985 dev_err(mmc_dev(host->mmc),
986 "%s: omap_request_dma() failed with %d\n",
987 mmc_hostname(host->mmc), ret);
988 return ret;
989 }
990
991 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
992 data->sg_len, omap_hsmmc_get_dma_dir(host, data));
993 host->dma_ch = dma_ch;
994 host->dma_sg_idx = 0;
995
996 omap_hsmmc_config_dma_params(host, data, data->sg);
997
998 return 0;
999 }
1000
1001 static void set_data_timeout(struct omap_hsmmc_host *host,
1002 unsigned int timeout_ns,
1003 unsigned int timeout_clks)
1004 {
1005 unsigned int timeout, cycle_ns;
1006 uint32_t reg, clkd, dto = 0;
1007
1008 reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1009 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1010 if (clkd == 0)
1011 clkd = 1;
1012
1013 cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1014 timeout = timeout_ns / cycle_ns;
1015 timeout += timeout_clks;
1016 if (timeout) {
1017 while ((timeout & 0x80000000) == 0) {
1018 dto += 1;
1019 timeout <<= 1;
1020 }
1021 dto = 31 - dto;
1022 timeout <<= 1;
1023 if (timeout && dto)
1024 dto += 1;
1025 if (dto >= 13)
1026 dto -= 13;
1027 else
1028 dto = 0;
1029 if (dto > 14)
1030 dto = 14;
1031 }
1032
1033 reg &= ~DTO_MASK;
1034 reg |= dto << DTO_SHIFT;
1035 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1036 }
1037
1038 /*
1039 * Configure block length for MMC/SD cards and initiate the transfer.
1040 */
1041 static int
1042 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1043 {
1044 int ret;
1045 host->data = req->data;
1046
1047 if (req->data == NULL) {
1048 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1049 /*
1050 * Set an arbitrary 100ms data timeout for commands with
1051 * busy signal.
1052 */
1053 if (req->cmd->flags & MMC_RSP_BUSY)
1054 set_data_timeout(host, 100000000U, 0);
1055 return 0;
1056 }
1057
1058 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1059 | (req->data->blocks << 16));
1060 set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1061
1062 if (host->use_dma) {
1063 ret = omap_hsmmc_start_dma_transfer(host, req);
1064 if (ret != 0) {
1065 dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1066 return ret;
1067 }
1068 }
1069 return 0;
1070 }
1071
1072 /*
1073 * Request function. for read/write operation
1074 */
1075 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1076 {
1077 struct omap_hsmmc_host *host = mmc_priv(mmc);
1078 int err;
1079
1080 /*
1081 * Prevent races with the interrupt handler because of unexpected
1082 * interrupts, but not if we are already in interrupt context i.e.
1083 * retries.
1084 */
1085 if (!in_interrupt()) {
1086 spin_lock_irqsave(&host->irq_lock, host->flags);
1087 /*
1088 * Protect the card from I/O if there is a possibility
1089 * it can be removed.
1090 */
1091 if (host->protect_card) {
1092 if (host->reqs_blocked < 3) {
1093 /*
1094 * Ensure the controller is left in a consistent
1095 * state by resetting the command and data state
1096 * machines.
1097 */
1098 omap_hsmmc_reset_controller_fsm(host, SRD);
1099 omap_hsmmc_reset_controller_fsm(host, SRC);
1100 host->reqs_blocked += 1;
1101 }
1102 req->cmd->error = -EBADF;
1103 if (req->data)
1104 req->data->error = -EBADF;
1105 spin_unlock_irqrestore(&host->irq_lock, host->flags);
1106 mmc_request_done(mmc, req);
1107 return;
1108 } else if (host->reqs_blocked)
1109 host->reqs_blocked = 0;
1110 }
1111 WARN_ON(host->mrq != NULL);
1112 host->mrq = req;
1113 err = omap_hsmmc_prepare_data(host, req);
1114 if (err) {
1115 req->cmd->error = err;
1116 if (req->data)
1117 req->data->error = err;
1118 host->mrq = NULL;
1119 if (!in_interrupt())
1120 spin_unlock_irqrestore(&host->irq_lock, host->flags);
1121 mmc_request_done(mmc, req);
1122 return;
1123 }
1124
1125 omap_hsmmc_start_command(host, req->cmd, req->data);
1126 }
1127
1128 /* Routine to configure clock values. Exposed API to core */
1129 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1130 {
1131 struct omap_hsmmc_host *host = mmc_priv(mmc);
1132 u16 dsor = 0;
1133 unsigned long regval;
1134 unsigned long timeout;
1135 u32 con;
1136 int do_send_init_stream = 0;
1137
1138 mmc_host_enable(host->mmc);
1139
1140 if (ios->power_mode != host->power_mode) {
1141 switch (ios->power_mode) {
1142 case MMC_POWER_OFF:
1143 mmc_slot(host).set_power(host->dev, host->slot_id,
1144 0, 0);
1145 host->vdd = 0;
1146 break;
1147 case MMC_POWER_UP:
1148 mmc_slot(host).set_power(host->dev, host->slot_id,
1149 1, ios->vdd);
1150 host->vdd = ios->vdd;
1151 break;
1152 case MMC_POWER_ON:
1153 do_send_init_stream = 1;
1154 break;
1155 }
1156 host->power_mode = ios->power_mode;
1157 }
1158
1159 /* FIXME: set registers based only on changes to ios */
1160
1161 con = OMAP_HSMMC_READ(host->base, CON);
1162 switch (mmc->ios.bus_width) {
1163 case MMC_BUS_WIDTH_8:
1164 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
1165 break;
1166 case MMC_BUS_WIDTH_4:
1167 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1168 OMAP_HSMMC_WRITE(host->base, HCTL,
1169 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
1170 break;
1171 case MMC_BUS_WIDTH_1:
1172 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1173 OMAP_HSMMC_WRITE(host->base, HCTL,
1174 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
1175 break;
1176 }
1177
1178 if (host->id == OMAP_MMC1_DEVID) {
1179 /* Only MMC1 can interface at 3V without some flavor
1180 * of external transceiver; but they all handle 1.8V.
1181 */
1182 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1183 (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1184 /*
1185 * The mmc_select_voltage fn of the core does
1186 * not seem to set the power_mode to
1187 * MMC_POWER_UP upon recalculating the voltage.
1188 * vdd 1.8v.
1189 */
1190 if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1191 dev_dbg(mmc_dev(host->mmc),
1192 "Switch operation failed\n");
1193 }
1194 }
1195
1196 if (ios->clock) {
1197 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
1198 if (dsor < 1)
1199 dsor = 1;
1200
1201 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
1202 dsor++;
1203
1204 if (dsor > 250)
1205 dsor = 250;
1206 }
1207 omap_hsmmc_stop_clock(host);
1208 regval = OMAP_HSMMC_READ(host->base, SYSCTL);
1209 regval = regval & ~(CLKD_MASK);
1210 regval = regval | (dsor << 6) | (DTO << 16);
1211 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
1212 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1213 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
1214
1215 /* Wait till the ICS bit is set */
1216 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
1217 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
1218 && time_before(jiffies, timeout))
1219 msleep(1);
1220
1221 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1222 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
1223
1224 if (do_send_init_stream)
1225 send_init_stream(host);
1226
1227 con = OMAP_HSMMC_READ(host->base, CON);
1228 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
1229 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
1230 else
1231 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
1232
1233 if (host->power_mode == MMC_POWER_OFF)
1234 mmc_host_disable(host->mmc);
1235 else
1236 mmc_host_lazy_disable(host->mmc);
1237 }
1238
1239 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1240 {
1241 struct omap_hsmmc_host *host = mmc_priv(mmc);
1242
1243 if (!mmc_slot(host).card_detect)
1244 return -ENOSYS;
1245 return mmc_slot(host).card_detect(mmc_slot(host).card_detect_irq);
1246 }
1247
1248 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1249 {
1250 struct omap_hsmmc_host *host = mmc_priv(mmc);
1251
1252 if (!mmc_slot(host).get_ro)
1253 return -ENOSYS;
1254 return mmc_slot(host).get_ro(host->dev, 0);
1255 }
1256
1257 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1258 {
1259 u32 hctl, capa, value;
1260
1261 /* Only MMC1 supports 3.0V */
1262 if (host->id == OMAP_MMC1_DEVID) {
1263 hctl = SDVS30;
1264 capa = VS30 | VS18;
1265 } else {
1266 hctl = SDVS18;
1267 capa = VS18;
1268 }
1269
1270 value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1271 OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1272
1273 value = OMAP_HSMMC_READ(host->base, CAPA);
1274 OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1275
1276 /* Set the controller to AUTO IDLE mode */
1277 value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1278 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1279
1280 /* Set SD bus power bit */
1281 set_sd_bus_power(host);
1282 }
1283
1284 /*
1285 * Dynamic power saving handling, FSM:
1286 * ENABLED -> DISABLED -> CARDSLEEP / REGSLEEP -> OFF
1287 * ^___________| | |
1288 * |______________________|______________________|
1289 *
1290 * ENABLED: mmc host is fully functional
1291 * DISABLED: fclk is off
1292 * CARDSLEEP: fclk is off, card is asleep, voltage regulator is asleep
1293 * REGSLEEP: fclk is off, voltage regulator is asleep
1294 * OFF: fclk is off, voltage regulator is off
1295 *
1296 * Transition handlers return the timeout for the next state transition
1297 * or negative error.
1298 */
1299
1300 enum {ENABLED = 0, DISABLED, CARDSLEEP, REGSLEEP, OFF};
1301
1302 /* Handler for [ENABLED -> DISABLED] transition */
1303 static int omap_hsmmc_enabled_to_disabled(struct omap_hsmmc_host *host)
1304 {
1305 omap_hsmmc_context_save(host);
1306 clk_disable(host->fclk);
1307 host->dpm_state = DISABLED;
1308
1309 dev_dbg(mmc_dev(host->mmc), "ENABLED -> DISABLED\n");
1310
1311 if (host->power_mode == MMC_POWER_OFF)
1312 return 0;
1313
1314 return msecs_to_jiffies(OMAP_MMC_SLEEP_TIMEOUT);
1315 }
1316
1317 /* Handler for [DISABLED -> REGSLEEP / CARDSLEEP] transition */
1318 static int omap_hsmmc_disabled_to_sleep(struct omap_hsmmc_host *host)
1319 {
1320 int err, new_state;
1321
1322 if (!mmc_try_claim_host(host->mmc))
1323 return 0;
1324
1325 clk_enable(host->fclk);
1326 omap_hsmmc_context_restore(host);
1327 if (mmc_card_can_sleep(host->mmc)) {
1328 err = mmc_card_sleep(host->mmc);
1329 if (err < 0) {
1330 clk_disable(host->fclk);
1331 mmc_release_host(host->mmc);
1332 return err;
1333 }
1334 new_state = CARDSLEEP;
1335 } else {
1336 new_state = REGSLEEP;
1337 }
1338 if (mmc_slot(host).set_sleep)
1339 mmc_slot(host).set_sleep(host->dev, host->slot_id, 1, 0,
1340 new_state == CARDSLEEP);
1341 /* FIXME: turn off bus power and perhaps interrupts too */
1342 clk_disable(host->fclk);
1343 host->dpm_state = new_state;
1344
1345 mmc_release_host(host->mmc);
1346
1347 dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n",
1348 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1349
1350 if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1351 mmc_slot(host).card_detect ||
1352 (mmc_slot(host).get_cover_state &&
1353 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))
1354 return msecs_to_jiffies(OMAP_MMC_OFF_TIMEOUT);
1355
1356 return 0;
1357 }
1358
1359 /* Handler for [REGSLEEP / CARDSLEEP -> OFF] transition */
1360 static int omap_hsmmc_sleep_to_off(struct omap_hsmmc_host *host)
1361 {
1362 if (!mmc_try_claim_host(host->mmc))
1363 return 0;
1364
1365 if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1366 mmc_slot(host).card_detect ||
1367 (mmc_slot(host).get_cover_state &&
1368 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))) {
1369 mmc_release_host(host->mmc);
1370 return 0;
1371 }
1372
1373 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1374 host->vdd = 0;
1375 host->power_mode = MMC_POWER_OFF;
1376
1377 dev_dbg(mmc_dev(host->mmc), "%s -> OFF\n",
1378 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1379
1380 host->dpm_state = OFF;
1381
1382 mmc_release_host(host->mmc);
1383
1384 return 0;
1385 }
1386
1387 /* Handler for [DISABLED -> ENABLED] transition */
1388 static int omap_hsmmc_disabled_to_enabled(struct omap_hsmmc_host *host)
1389 {
1390 int err;
1391
1392 err = clk_enable(host->fclk);
1393 if (err < 0)
1394 return err;
1395
1396 omap_hsmmc_context_restore(host);
1397 host->dpm_state = ENABLED;
1398
1399 dev_dbg(mmc_dev(host->mmc), "DISABLED -> ENABLED\n");
1400
1401 return 0;
1402 }
1403
1404 /* Handler for [SLEEP -> ENABLED] transition */
1405 static int omap_hsmmc_sleep_to_enabled(struct omap_hsmmc_host *host)
1406 {
1407 if (!mmc_try_claim_host(host->mmc))
1408 return 0;
1409
1410 clk_enable(host->fclk);
1411 omap_hsmmc_context_restore(host);
1412 if (mmc_slot(host).set_sleep)
1413 mmc_slot(host).set_sleep(host->dev, host->slot_id, 0,
1414 host->vdd, host->dpm_state == CARDSLEEP);
1415 if (mmc_card_can_sleep(host->mmc))
1416 mmc_card_awake(host->mmc);
1417
1418 dev_dbg(mmc_dev(host->mmc), "%s -> ENABLED\n",
1419 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1420
1421 host->dpm_state = ENABLED;
1422
1423 mmc_release_host(host->mmc);
1424
1425 return 0;
1426 }
1427
1428 /* Handler for [OFF -> ENABLED] transition */
1429 static int omap_hsmmc_off_to_enabled(struct omap_hsmmc_host *host)
1430 {
1431 clk_enable(host->fclk);
1432
1433 omap_hsmmc_context_restore(host);
1434 omap_hsmmc_conf_bus_power(host);
1435 mmc_power_restore_host(host->mmc);
1436
1437 host->dpm_state = ENABLED;
1438
1439 dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n");
1440
1441 return 0;
1442 }
1443
1444 /*
1445 * Bring MMC host to ENABLED from any other PM state.
1446 */
1447 static int omap_hsmmc_enable(struct mmc_host *mmc)
1448 {
1449 struct omap_hsmmc_host *host = mmc_priv(mmc);
1450
1451 switch (host->dpm_state) {
1452 case DISABLED:
1453 return omap_hsmmc_disabled_to_enabled(host);
1454 case CARDSLEEP:
1455 case REGSLEEP:
1456 return omap_hsmmc_sleep_to_enabled(host);
1457 case OFF:
1458 return omap_hsmmc_off_to_enabled(host);
1459 default:
1460 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1461 return -EINVAL;
1462 }
1463 }
1464
1465 /*
1466 * Bring MMC host in PM state (one level deeper).
1467 */
1468 static int omap_hsmmc_disable(struct mmc_host *mmc, int lazy)
1469 {
1470 struct omap_hsmmc_host *host = mmc_priv(mmc);
1471
1472 switch (host->dpm_state) {
1473 case ENABLED: {
1474 int delay;
1475
1476 delay = omap_hsmmc_enabled_to_disabled(host);
1477 if (lazy || delay < 0)
1478 return delay;
1479 return 0;
1480 }
1481 case DISABLED:
1482 return omap_hsmmc_disabled_to_sleep(host);
1483 case CARDSLEEP:
1484 case REGSLEEP:
1485 return omap_hsmmc_sleep_to_off(host);
1486 default:
1487 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1488 return -EINVAL;
1489 }
1490 }
1491
1492 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1493 {
1494 struct omap_hsmmc_host *host = mmc_priv(mmc);
1495 int err;
1496
1497 err = clk_enable(host->fclk);
1498 if (err)
1499 return err;
1500 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
1501 omap_hsmmc_context_restore(host);
1502 return 0;
1503 }
1504
1505 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
1506 {
1507 struct omap_hsmmc_host *host = mmc_priv(mmc);
1508
1509 omap_hsmmc_context_save(host);
1510 clk_disable(host->fclk);
1511 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
1512 return 0;
1513 }
1514
1515 static const struct mmc_host_ops omap_hsmmc_ops = {
1516 .enable = omap_hsmmc_enable_fclk,
1517 .disable = omap_hsmmc_disable_fclk,
1518 .request = omap_hsmmc_request,
1519 .set_ios = omap_hsmmc_set_ios,
1520 .get_cd = omap_hsmmc_get_cd,
1521 .get_ro = omap_hsmmc_get_ro,
1522 /* NYET -- enable_sdio_irq */
1523 };
1524
1525 static const struct mmc_host_ops omap_hsmmc_ps_ops = {
1526 .enable = omap_hsmmc_enable,
1527 .disable = omap_hsmmc_disable,
1528 .request = omap_hsmmc_request,
1529 .set_ios = omap_hsmmc_set_ios,
1530 .get_cd = omap_hsmmc_get_cd,
1531 .get_ro = omap_hsmmc_get_ro,
1532 /* NYET -- enable_sdio_irq */
1533 };
1534
1535 #ifdef CONFIG_DEBUG_FS
1536
1537 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1538 {
1539 struct mmc_host *mmc = s->private;
1540 struct omap_hsmmc_host *host = mmc_priv(mmc);
1541 int context_loss = 0;
1542
1543 if (host->pdata->get_context_loss_count)
1544 context_loss = host->pdata->get_context_loss_count(host->dev);
1545
1546 seq_printf(s, "mmc%d:\n"
1547 " enabled:\t%d\n"
1548 " dpm_state:\t%d\n"
1549 " nesting_cnt:\t%d\n"
1550 " ctx_loss:\t%d:%d\n"
1551 "\nregs:\n",
1552 mmc->index, mmc->enabled ? 1 : 0,
1553 host->dpm_state, mmc->nesting_cnt,
1554 host->context_loss, context_loss);
1555
1556 if (host->suspended || host->dpm_state == OFF) {
1557 seq_printf(s, "host suspended, can't read registers\n");
1558 return 0;
1559 }
1560
1561 if (clk_enable(host->fclk) != 0) {
1562 seq_printf(s, "can't read the regs\n");
1563 return 0;
1564 }
1565
1566 seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1567 OMAP_HSMMC_READ(host->base, SYSCONFIG));
1568 seq_printf(s, "CON:\t\t0x%08x\n",
1569 OMAP_HSMMC_READ(host->base, CON));
1570 seq_printf(s, "HCTL:\t\t0x%08x\n",
1571 OMAP_HSMMC_READ(host->base, HCTL));
1572 seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1573 OMAP_HSMMC_READ(host->base, SYSCTL));
1574 seq_printf(s, "IE:\t\t0x%08x\n",
1575 OMAP_HSMMC_READ(host->base, IE));
1576 seq_printf(s, "ISE:\t\t0x%08x\n",
1577 OMAP_HSMMC_READ(host->base, ISE));
1578 seq_printf(s, "CAPA:\t\t0x%08x\n",
1579 OMAP_HSMMC_READ(host->base, CAPA));
1580
1581 clk_disable(host->fclk);
1582
1583 return 0;
1584 }
1585
1586 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1587 {
1588 return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1589 }
1590
1591 static const struct file_operations mmc_regs_fops = {
1592 .open = omap_hsmmc_regs_open,
1593 .read = seq_read,
1594 .llseek = seq_lseek,
1595 .release = single_release,
1596 };
1597
1598 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1599 {
1600 if (mmc->debugfs_root)
1601 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1602 mmc, &mmc_regs_fops);
1603 }
1604
1605 #else
1606
1607 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1608 {
1609 }
1610
1611 #endif
1612
1613 static int __init omap_hsmmc_probe(struct platform_device *pdev)
1614 {
1615 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1616 struct mmc_host *mmc;
1617 struct omap_hsmmc_host *host = NULL;
1618 struct resource *res;
1619 int ret = 0, irq;
1620
1621 if (pdata == NULL) {
1622 dev_err(&pdev->dev, "Platform Data is missing\n");
1623 return -ENXIO;
1624 }
1625
1626 if (pdata->nr_slots == 0) {
1627 dev_err(&pdev->dev, "No Slots\n");
1628 return -ENXIO;
1629 }
1630
1631 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1632 irq = platform_get_irq(pdev, 0);
1633 if (res == NULL || irq < 0)
1634 return -ENXIO;
1635
1636 res = request_mem_region(res->start, res->end - res->start + 1,
1637 pdev->name);
1638 if (res == NULL)
1639 return -EBUSY;
1640
1641 mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1642 if (!mmc) {
1643 ret = -ENOMEM;
1644 goto err;
1645 }
1646
1647 host = mmc_priv(mmc);
1648 host->mmc = mmc;
1649 host->pdata = pdata;
1650 host->dev = &pdev->dev;
1651 host->use_dma = 1;
1652 host->dev->dma_mask = &pdata->dma_mask;
1653 host->dma_ch = -1;
1654 host->irq = irq;
1655 host->id = pdev->id;
1656 host->slot_id = 0;
1657 host->mapbase = res->start;
1658 host->base = ioremap(host->mapbase, SZ_4K);
1659 host->power_mode = -1;
1660
1661 platform_set_drvdata(pdev, host);
1662 INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect);
1663
1664 if (mmc_slot(host).power_saving)
1665 mmc->ops = &omap_hsmmc_ps_ops;
1666 else
1667 mmc->ops = &omap_hsmmc_ops;
1668
1669 mmc->f_min = 400000;
1670 mmc->f_max = 52000000;
1671
1672 sema_init(&host->sem, 1);
1673 spin_lock_init(&host->irq_lock);
1674
1675 host->iclk = clk_get(&pdev->dev, "ick");
1676 if (IS_ERR(host->iclk)) {
1677 ret = PTR_ERR(host->iclk);
1678 host->iclk = NULL;
1679 goto err1;
1680 }
1681 host->fclk = clk_get(&pdev->dev, "fck");
1682 if (IS_ERR(host->fclk)) {
1683 ret = PTR_ERR(host->fclk);
1684 host->fclk = NULL;
1685 clk_put(host->iclk);
1686 goto err1;
1687 }
1688
1689 omap_hsmmc_context_save(host);
1690
1691 mmc->caps |= MMC_CAP_DISABLE;
1692 mmc_set_disable_delay(mmc, OMAP_MMC_DISABLED_TIMEOUT);
1693 /* we start off in DISABLED state */
1694 host->dpm_state = DISABLED;
1695
1696 if (mmc_host_enable(host->mmc) != 0) {
1697 clk_put(host->iclk);
1698 clk_put(host->fclk);
1699 goto err1;
1700 }
1701
1702 if (clk_enable(host->iclk) != 0) {
1703 mmc_host_disable(host->mmc);
1704 clk_put(host->iclk);
1705 clk_put(host->fclk);
1706 goto err1;
1707 }
1708
1709 if (cpu_is_omap2430()) {
1710 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1711 /*
1712 * MMC can still work without debounce clock.
1713 */
1714 if (IS_ERR(host->dbclk))
1715 dev_warn(mmc_dev(host->mmc),
1716 "Failed to get debounce clock\n");
1717 else
1718 host->got_dbclk = 1;
1719
1720 if (host->got_dbclk)
1721 if (clk_enable(host->dbclk) != 0)
1722 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
1723 " clk failed\n");
1724 }
1725
1726 /* Since we do only SG emulation, we can have as many segs
1727 * as we want. */
1728 mmc->max_phys_segs = 1024;
1729 mmc->max_hw_segs = 1024;
1730
1731 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
1732 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
1733 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1734 mmc->max_seg_size = mmc->max_req_size;
1735
1736 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1737 MMC_CAP_WAIT_WHILE_BUSY;
1738
1739 if (mmc_slot(host).wires >= 8)
1740 mmc->caps |= MMC_CAP_8_BIT_DATA;
1741 else if (mmc_slot(host).wires >= 4)
1742 mmc->caps |= MMC_CAP_4_BIT_DATA;
1743
1744 if (mmc_slot(host).nonremovable)
1745 mmc->caps |= MMC_CAP_NONREMOVABLE;
1746
1747 omap_hsmmc_conf_bus_power(host);
1748
1749 /* Select DMA lines */
1750 switch (host->id) {
1751 case OMAP_MMC1_DEVID:
1752 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
1753 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
1754 break;
1755 case OMAP_MMC2_DEVID:
1756 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
1757 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
1758 break;
1759 case OMAP_MMC3_DEVID:
1760 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
1761 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
1762 break;
1763 case OMAP_MMC4_DEVID:
1764 host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
1765 host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
1766 break;
1767 case OMAP_MMC5_DEVID:
1768 host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
1769 host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
1770 break;
1771 default:
1772 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
1773 goto err_irq;
1774 }
1775
1776 /* Request IRQ for MMC operations */
1777 ret = request_irq(host->irq, omap_hsmmc_irq, IRQF_DISABLED,
1778 mmc_hostname(mmc), host);
1779 if (ret) {
1780 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1781 goto err_irq;
1782 }
1783
1784 /* initialize power supplies, gpios, etc */
1785 if (pdata->init != NULL) {
1786 if (pdata->init(&pdev->dev) != 0) {
1787 dev_dbg(mmc_dev(host->mmc),
1788 "Unable to configure MMC IRQs\n");
1789 goto err_irq_cd_init;
1790 }
1791 }
1792 mmc->ocr_avail = mmc_slot(host).ocr_mask;
1793
1794 /* Request IRQ for card detect */
1795 if ((mmc_slot(host).card_detect_irq)) {
1796 ret = request_irq(mmc_slot(host).card_detect_irq,
1797 omap_hsmmc_cd_handler,
1798 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
1799 | IRQF_DISABLED,
1800 mmc_hostname(mmc), host);
1801 if (ret) {
1802 dev_dbg(mmc_dev(host->mmc),
1803 "Unable to grab MMC CD IRQ\n");
1804 goto err_irq_cd;
1805 }
1806 }
1807
1808 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
1809 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
1810
1811 mmc_host_lazy_disable(host->mmc);
1812
1813 omap_hsmmc_protect_card(host);
1814
1815 mmc_add_host(mmc);
1816
1817 if (mmc_slot(host).name != NULL) {
1818 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1819 if (ret < 0)
1820 goto err_slot_name;
1821 }
1822 if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
1823 ret = device_create_file(&mmc->class_dev,
1824 &dev_attr_cover_switch);
1825 if (ret < 0)
1826 goto err_cover_switch;
1827 }
1828
1829 omap_hsmmc_debugfs(mmc);
1830
1831 return 0;
1832
1833 err_cover_switch:
1834 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
1835 err_slot_name:
1836 mmc_remove_host(mmc);
1837 err_irq_cd:
1838 free_irq(mmc_slot(host).card_detect_irq, host);
1839 err_irq_cd_init:
1840 free_irq(host->irq, host);
1841 err_irq:
1842 mmc_host_disable(host->mmc);
1843 clk_disable(host->iclk);
1844 clk_put(host->fclk);
1845 clk_put(host->iclk);
1846 if (host->got_dbclk) {
1847 clk_disable(host->dbclk);
1848 clk_put(host->dbclk);
1849 }
1850
1851 err1:
1852 iounmap(host->base);
1853 err:
1854 dev_dbg(mmc_dev(host->mmc), "Probe Failed\n");
1855 release_mem_region(res->start, res->end - res->start + 1);
1856 if (host)
1857 mmc_free_host(mmc);
1858 return ret;
1859 }
1860
1861 static int omap_hsmmc_remove(struct platform_device *pdev)
1862 {
1863 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
1864 struct resource *res;
1865
1866 if (host) {
1867 mmc_host_enable(host->mmc);
1868 mmc_remove_host(host->mmc);
1869 if (host->pdata->cleanup)
1870 host->pdata->cleanup(&pdev->dev);
1871 free_irq(host->irq, host);
1872 if (mmc_slot(host).card_detect_irq)
1873 free_irq(mmc_slot(host).card_detect_irq, host);
1874 flush_scheduled_work();
1875
1876 mmc_host_disable(host->mmc);
1877 clk_disable(host->iclk);
1878 clk_put(host->fclk);
1879 clk_put(host->iclk);
1880 if (host->got_dbclk) {
1881 clk_disable(host->dbclk);
1882 clk_put(host->dbclk);
1883 }
1884
1885 mmc_free_host(host->mmc);
1886 iounmap(host->base);
1887 }
1888
1889 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1890 if (res)
1891 release_mem_region(res->start, res->end - res->start + 1);
1892 platform_set_drvdata(pdev, NULL);
1893
1894 return 0;
1895 }
1896
1897 #ifdef CONFIG_PM
1898 static int omap_hsmmc_suspend(struct platform_device *pdev, pm_message_t state)
1899 {
1900 int ret = 0;
1901 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
1902
1903 if (host && host->suspended)
1904 return 0;
1905
1906 if (host) {
1907 host->suspended = 1;
1908 if (host->pdata->suspend) {
1909 ret = host->pdata->suspend(&pdev->dev,
1910 host->slot_id);
1911 if (ret) {
1912 dev_dbg(mmc_dev(host->mmc),
1913 "Unable to handle MMC board"
1914 " level suspend\n");
1915 host->suspended = 0;
1916 return ret;
1917 }
1918 }
1919 cancel_work_sync(&host->mmc_carddetect_work);
1920 mmc_host_enable(host->mmc);
1921 ret = mmc_suspend_host(host->mmc, state);
1922 if (ret == 0) {
1923 OMAP_HSMMC_WRITE(host->base, ISE, 0);
1924 OMAP_HSMMC_WRITE(host->base, IE, 0);
1925
1926
1927 OMAP_HSMMC_WRITE(host->base, HCTL,
1928 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
1929 mmc_host_disable(host->mmc);
1930 clk_disable(host->iclk);
1931 if (host->got_dbclk)
1932 clk_disable(host->dbclk);
1933 } else {
1934 host->suspended = 0;
1935 if (host->pdata->resume) {
1936 ret = host->pdata->resume(&pdev->dev,
1937 host->slot_id);
1938 if (ret)
1939 dev_dbg(mmc_dev(host->mmc),
1940 "Unmask interrupt failed\n");
1941 }
1942 mmc_host_disable(host->mmc);
1943 }
1944
1945 }
1946 return ret;
1947 }
1948
1949 /* Routine to resume the MMC device */
1950 static int omap_hsmmc_resume(struct platform_device *pdev)
1951 {
1952 int ret = 0;
1953 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
1954
1955 if (host && !host->suspended)
1956 return 0;
1957
1958 if (host) {
1959 ret = clk_enable(host->iclk);
1960 if (ret)
1961 goto clk_en_err;
1962
1963 if (mmc_host_enable(host->mmc) != 0) {
1964 clk_disable(host->iclk);
1965 goto clk_en_err;
1966 }
1967
1968 if (host->got_dbclk)
1969 clk_enable(host->dbclk);
1970
1971 omap_hsmmc_conf_bus_power(host);
1972
1973 if (host->pdata->resume) {
1974 ret = host->pdata->resume(&pdev->dev, host->slot_id);
1975 if (ret)
1976 dev_dbg(mmc_dev(host->mmc),
1977 "Unmask interrupt failed\n");
1978 }
1979
1980 omap_hsmmc_protect_card(host);
1981
1982 /* Notify the core to resume the host */
1983 ret = mmc_resume_host(host->mmc);
1984 if (ret == 0)
1985 host->suspended = 0;
1986
1987 mmc_host_lazy_disable(host->mmc);
1988 }
1989
1990 return ret;
1991
1992 clk_en_err:
1993 dev_dbg(mmc_dev(host->mmc),
1994 "Failed to enable MMC clocks during resume\n");
1995 return ret;
1996 }
1997
1998 #else
1999 #define omap_hsmmc_suspend NULL
2000 #define omap_hsmmc_resume NULL
2001 #endif
2002
2003 static struct platform_driver omap_hsmmc_driver = {
2004 .remove = omap_hsmmc_remove,
2005 .suspend = omap_hsmmc_suspend,
2006 .resume = omap_hsmmc_resume,
2007 .driver = {
2008 .name = DRIVER_NAME,
2009 .owner = THIS_MODULE,
2010 },
2011 };
2012
2013 static int __init omap_hsmmc_init(void)
2014 {
2015 /* Register the MMC driver */
2016 return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe);
2017 }
2018
2019 static void __exit omap_hsmmc_cleanup(void)
2020 {
2021 /* Unregister MMC driver */
2022 platform_driver_unregister(&omap_hsmmc_driver);
2023 }
2024
2025 module_init(omap_hsmmc_init);
2026 module_exit(omap_hsmmc_cleanup);
2027
2028 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2029 MODULE_LICENSE("GPL");
2030 MODULE_ALIAS("platform:" DRIVER_NAME);
2031 MODULE_AUTHOR("Texas Instruments Inc");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree