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mmc: Atmel host kconfig cleanup for everyone else
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mmc / host / omap_hsmmc.c
blob83f0affadcae638fcbc0abc8cc0e892c23e16142
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 <linux/gpio.h>
34 #include <linux/regulator/consumer.h>
35 #include <plat/dma.h>
36 #include <mach/hardware.h>
37 #include <plat/board.h>
38 #include <plat/mmc.h>
39 #include <plat/cpu.h>
40
41 /* OMAP HSMMC Host Controller Registers */
42 #define OMAP_HSMMC_SYSCONFIG 0x0010
43 #define OMAP_HSMMC_SYSSTATUS 0x0014
44 #define OMAP_HSMMC_CON 0x002C
45 #define OMAP_HSMMC_BLK 0x0104
46 #define OMAP_HSMMC_ARG 0x0108
47 #define OMAP_HSMMC_CMD 0x010C
48 #define OMAP_HSMMC_RSP10 0x0110
49 #define OMAP_HSMMC_RSP32 0x0114
50 #define OMAP_HSMMC_RSP54 0x0118
51 #define OMAP_HSMMC_RSP76 0x011C
52 #define OMAP_HSMMC_DATA 0x0120
53 #define OMAP_HSMMC_HCTL 0x0128
54 #define OMAP_HSMMC_SYSCTL 0x012C
55 #define OMAP_HSMMC_STAT 0x0130
56 #define OMAP_HSMMC_IE 0x0134
57 #define OMAP_HSMMC_ISE 0x0138
58 #define OMAP_HSMMC_CAPA 0x0140
59
60 #define VS18 (1 << 26)
61 #define VS30 (1 << 25)
62 #define SDVS18 (0x5 << 9)
63 #define SDVS30 (0x6 << 9)
64 #define SDVS33 (0x7 << 9)
65 #define SDVS_MASK 0x00000E00
66 #define SDVSCLR 0xFFFFF1FF
67 #define SDVSDET 0x00000400
68 #define AUTOIDLE 0x1
69 #define SDBP (1 << 8)
70 #define DTO 0xe
71 #define ICE 0x1
72 #define ICS 0x2
73 #define CEN (1 << 2)
74 #define CLKD_MASK 0x0000FFC0
75 #define CLKD_SHIFT 6
76 #define DTO_MASK 0x000F0000
77 #define DTO_SHIFT 16
78 #define INT_EN_MASK 0x307F0033
79 #define BWR_ENABLE (1 << 4)
80 #define BRR_ENABLE (1 << 5)
81 #define INIT_STREAM (1 << 1)
82 #define DP_SELECT (1 << 21)
83 #define DDIR (1 << 4)
84 #define DMA_EN 0x1
85 #define MSBS (1 << 5)
86 #define BCE (1 << 1)
87 #define FOUR_BIT (1 << 1)
88 #define DW8 (1 << 5)
89 #define CC 0x1
90 #define TC 0x02
91 #define OD 0x1
92 #define ERR (1 << 15)
93 #define CMD_TIMEOUT (1 << 16)
94 #define DATA_TIMEOUT (1 << 20)
95 #define CMD_CRC (1 << 17)
96 #define DATA_CRC (1 << 21)
97 #define CARD_ERR (1 << 28)
98 #define STAT_CLEAR 0xFFFFFFFF
99 #define INIT_STREAM_CMD 0x00000000
100 #define DUAL_VOLT_OCR_BIT 7
101 #define SRC (1 << 25)
102 #define SRD (1 << 26)
103 #define SOFTRESET (1 << 1)
104 #define RESETDONE (1 << 0)
105
106 /*
107 * FIXME: Most likely all the data using these _DEVID defines should come
108 * from the platform_data, or implemented in controller and slot specific
109 * functions.
110 */
111 #define OMAP_MMC1_DEVID 0
112 #define OMAP_MMC2_DEVID 1
113 #define OMAP_MMC3_DEVID 2
114 #define OMAP_MMC4_DEVID 3
115 #define OMAP_MMC5_DEVID 4
116
117 #define MMC_TIMEOUT_MS 20
118 #define OMAP_MMC_MASTER_CLOCK 96000000
119 #define DRIVER_NAME "mmci-omap-hs"
120
121 /* Timeouts for entering power saving states on inactivity, msec */
122 #define OMAP_MMC_DISABLED_TIMEOUT 100
123 #define OMAP_MMC_SLEEP_TIMEOUT 1000
124 #define OMAP_MMC_OFF_TIMEOUT 8000
125
126 /*
127 * One controller can have multiple slots, like on some omap boards using
128 * omap.c controller driver. Luckily this is not currently done on any known
129 * omap_hsmmc.c device.
130 */
131 #define mmc_slot(host) (host->pdata->slots[host->slot_id])
132
133 /*
134 * MMC Host controller read/write API's
135 */
136 #define OMAP_HSMMC_READ(base, reg) \
137 __raw_readl((base) + OMAP_HSMMC_##reg)
138
139 #define OMAP_HSMMC_WRITE(base, reg, val) \
140 __raw_writel((val), (base) + OMAP_HSMMC_##reg)
141
142 struct omap_hsmmc_host {
143 struct device *dev;
144 struct mmc_host *mmc;
145 struct mmc_request *mrq;
146 struct mmc_command *cmd;
147 struct mmc_data *data;
148 struct clk *fclk;
149 struct clk *iclk;
150 struct clk *dbclk;
151 /*
152 * vcc == configured supply
153 * vcc_aux == optional
154 * - MMC1, supply for DAT4..DAT7
155 * - MMC2/MMC2, external level shifter voltage supply, for
156 * chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
157 */
158 struct regulator *vcc;
159 struct regulator *vcc_aux;
160 struct semaphore sem;
161 struct work_struct mmc_carddetect_work;
162 void __iomem *base;
163 resource_size_t mapbase;
164 spinlock_t irq_lock; /* Prevent races with irq handler */
165 unsigned long flags;
166 unsigned int id;
167 unsigned int dma_len;
168 unsigned int dma_sg_idx;
169 unsigned char bus_mode;
170 unsigned char power_mode;
171 u32 *buffer;
172 u32 bytesleft;
173 int suspended;
174 int irq;
175 int use_dma, dma_ch;
176 int dma_line_tx, dma_line_rx;
177 int slot_id;
178 int got_dbclk;
179 int response_busy;
180 int context_loss;
181 int dpm_state;
182 int vdd;
183 int protect_card;
184 int reqs_blocked;
185 int use_reg;
186
187 struct omap_mmc_platform_data *pdata;
188 };
189
190 static int omap_hsmmc_card_detect(struct device *dev, int slot)
191 {
192 struct omap_mmc_platform_data *mmc = dev->platform_data;
193
194 /* NOTE: assumes card detect signal is active-low */
195 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
196 }
197
198 static int omap_hsmmc_get_wp(struct device *dev, int slot)
199 {
200 struct omap_mmc_platform_data *mmc = dev->platform_data;
201
202 /* NOTE: assumes write protect signal is active-high */
203 return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
204 }
205
206 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
207 {
208 struct omap_mmc_platform_data *mmc = dev->platform_data;
209
210 /* NOTE: assumes card detect signal is active-low */
211 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
212 }
213
214 #ifdef CONFIG_PM
215
216 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
217 {
218 struct omap_mmc_platform_data *mmc = dev->platform_data;
219
220 disable_irq(mmc->slots[0].card_detect_irq);
221 return 0;
222 }
223
224 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
225 {
226 struct omap_mmc_platform_data *mmc = dev->platform_data;
227
228 enable_irq(mmc->slots[0].card_detect_irq);
229 return 0;
230 }
231
232 #else
233
234 #define omap_hsmmc_suspend_cdirq NULL
235 #define omap_hsmmc_resume_cdirq NULL
236
237 #endif
238
239 #ifdef CONFIG_REGULATOR
240
241 static int omap_hsmmc_1_set_power(struct device *dev, int slot, int power_on,
242 int vdd)
243 {
244 struct omap_hsmmc_host *host =
245 platform_get_drvdata(to_platform_device(dev));
246 int ret;
247
248 if (mmc_slot(host).before_set_reg)
249 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
250
251 if (power_on)
252 ret = mmc_regulator_set_ocr(host->vcc, vdd);
253 else
254 ret = mmc_regulator_set_ocr(host->vcc, 0);
255
256 if (mmc_slot(host).after_set_reg)
257 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
258
259 return ret;
260 }
261
262 static int omap_hsmmc_23_set_power(struct device *dev, int slot, int power_on,
263 int vdd)
264 {
265 struct omap_hsmmc_host *host =
266 platform_get_drvdata(to_platform_device(dev));
267 int ret = 0;
268
269 /*
270 * If we don't see a Vcc regulator, assume it's a fixed
271 * voltage always-on regulator.
272 */
273 if (!host->vcc)
274 return 0;
275
276 if (mmc_slot(host).before_set_reg)
277 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
278
279 /*
280 * Assume Vcc regulator is used only to power the card ... OMAP
281 * VDDS is used to power the pins, optionally with a transceiver to
282 * support cards using voltages other than VDDS (1.8V nominal). When a
283 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
284 *
285 * In some cases this regulator won't support enable/disable;
286 * e.g. it's a fixed rail for a WLAN chip.
287 *
288 * In other cases vcc_aux switches interface power. Example, for
289 * eMMC cards it represents VccQ. Sometimes transceivers or SDIO
290 * chips/cards need an interface voltage rail too.
291 */
292 if (power_on) {
293 ret = mmc_regulator_set_ocr(host->vcc, vdd);
294 /* Enable interface voltage rail, if needed */
295 if (ret == 0 && host->vcc_aux) {
296 ret = regulator_enable(host->vcc_aux);
297 if (ret < 0)
298 ret = mmc_regulator_set_ocr(host->vcc, 0);
299 }
300 } else {
301 if (host->vcc_aux)
302 ret = regulator_disable(host->vcc_aux);
303 if (ret == 0)
304 ret = mmc_regulator_set_ocr(host->vcc, 0);
305 }
306
307 if (mmc_slot(host).after_set_reg)
308 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
309
310 return ret;
311 }
312
313 static int omap_hsmmc_1_set_sleep(struct device *dev, int slot, int sleep,
314 int vdd, int cardsleep)
315 {
316 struct omap_hsmmc_host *host =
317 platform_get_drvdata(to_platform_device(dev));
318 int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
319
320 return regulator_set_mode(host->vcc, mode);
321 }
322
323 static int omap_hsmmc_23_set_sleep(struct device *dev, int slot, int sleep,
324 int vdd, int cardsleep)
325 {
326 struct omap_hsmmc_host *host =
327 platform_get_drvdata(to_platform_device(dev));
328 int err, mode;
329
330 /*
331 * If we don't see a Vcc regulator, assume it's a fixed
332 * voltage always-on regulator.
333 */
334 if (!host->vcc)
335 return 0;
336
337 mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
338
339 if (!host->vcc_aux)
340 return regulator_set_mode(host->vcc, mode);
341
342 if (cardsleep) {
343 /* VCC can be turned off if card is asleep */
344 if (sleep)
345 err = mmc_regulator_set_ocr(host->vcc, 0);
346 else
347 err = mmc_regulator_set_ocr(host->vcc, vdd);
348 } else
349 err = regulator_set_mode(host->vcc, mode);
350 if (err)
351 return err;
352
353 if (!mmc_slot(host).vcc_aux_disable_is_sleep)
354 return regulator_set_mode(host->vcc_aux, mode);
355
356 if (sleep)
357 return regulator_disable(host->vcc_aux);
358 else
359 return regulator_enable(host->vcc_aux);
360 }
361
362 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
363 {
364 struct regulator *reg;
365 int ret = 0;
366
367 switch (host->id) {
368 case OMAP_MMC1_DEVID:
369 /* On-chip level shifting via PBIAS0/PBIAS1 */
370 mmc_slot(host).set_power = omap_hsmmc_1_set_power;
371 mmc_slot(host).set_sleep = omap_hsmmc_1_set_sleep;
372 break;
373 case OMAP_MMC2_DEVID:
374 case OMAP_MMC3_DEVID:
375 /* Off-chip level shifting, or none */
376 mmc_slot(host).set_power = omap_hsmmc_23_set_power;
377 mmc_slot(host).set_sleep = omap_hsmmc_23_set_sleep;
378 break;
379 default:
380 pr_err("MMC%d configuration not supported!\n", host->id);
381 return -EINVAL;
382 }
383
384 reg = regulator_get(host->dev, "vmmc");
385 if (IS_ERR(reg)) {
386 dev_dbg(host->dev, "vmmc regulator missing\n");
387 /*
388 * HACK: until fixed.c regulator is usable,
389 * we don't require a main regulator
390 * for MMC2 or MMC3
391 */
392 if (host->id == OMAP_MMC1_DEVID) {
393 ret = PTR_ERR(reg);
394 goto err;
395 }
396 } else {
397 host->vcc = reg;
398 mmc_slot(host).ocr_mask = mmc_regulator_get_ocrmask(reg);
399
400 /* Allow an aux regulator */
401 reg = regulator_get(host->dev, "vmmc_aux");
402 host->vcc_aux = IS_ERR(reg) ? NULL : reg;
403
404 /*
405 * UGLY HACK: workaround regulator framework bugs.
406 * When the bootloader leaves a supply active, it's
407 * initialized with zero usecount ... and we can't
408 * disable it without first enabling it. Until the
409 * framework is fixed, we need a workaround like this
410 * (which is safe for MMC, but not in general).
411 */
412 if (regulator_is_enabled(host->vcc) > 0) {
413 regulator_enable(host->vcc);
414 regulator_disable(host->vcc);
415 }
416 if (host->vcc_aux) {
417 if (regulator_is_enabled(reg) > 0) {
418 regulator_enable(reg);
419 regulator_disable(reg);
420 }
421 }
422 }
423
424 return 0;
425
426 err:
427 mmc_slot(host).set_power = NULL;
428 mmc_slot(host).set_sleep = NULL;
429 return ret;
430 }
431
432 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
433 {
434 regulator_put(host->vcc);
435 regulator_put(host->vcc_aux);
436 mmc_slot(host).set_power = NULL;
437 mmc_slot(host).set_sleep = NULL;
438 }
439
440 static inline int omap_hsmmc_have_reg(void)
441 {
442 return 1;
443 }
444
445 #else
446
447 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
448 {
449 return -EINVAL;
450 }
451
452 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
453 {
454 }
455
456 static inline int omap_hsmmc_have_reg(void)
457 {
458 return 0;
459 }
460
461 #endif
462
463 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
464 {
465 int ret;
466
467 if (gpio_is_valid(pdata->slots[0].switch_pin)) {
468 pdata->suspend = omap_hsmmc_suspend_cdirq;
469 pdata->resume = omap_hsmmc_resume_cdirq;
470 if (pdata->slots[0].cover)
471 pdata->slots[0].get_cover_state =
472 omap_hsmmc_get_cover_state;
473 else
474 pdata->slots[0].card_detect = omap_hsmmc_card_detect;
475 pdata->slots[0].card_detect_irq =
476 gpio_to_irq(pdata->slots[0].switch_pin);
477 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
478 if (ret)
479 return ret;
480 ret = gpio_direction_input(pdata->slots[0].switch_pin);
481 if (ret)
482 goto err_free_sp;
483 } else
484 pdata->slots[0].switch_pin = -EINVAL;
485
486 if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
487 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
488 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
489 if (ret)
490 goto err_free_cd;
491 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
492 if (ret)
493 goto err_free_wp;
494 } else
495 pdata->slots[0].gpio_wp = -EINVAL;
496
497 return 0;
498
499 err_free_wp:
500 gpio_free(pdata->slots[0].gpio_wp);
501 err_free_cd:
502 if (gpio_is_valid(pdata->slots[0].switch_pin))
503 err_free_sp:
504 gpio_free(pdata->slots[0].switch_pin);
505 return ret;
506 }
507
508 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
509 {
510 if (gpio_is_valid(pdata->slots[0].gpio_wp))
511 gpio_free(pdata->slots[0].gpio_wp);
512 if (gpio_is_valid(pdata->slots[0].switch_pin))
513 gpio_free(pdata->slots[0].switch_pin);
514 }
515
516 /*
517 * Stop clock to the card
518 */
519 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
520 {
521 OMAP_HSMMC_WRITE(host->base, SYSCTL,
522 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
523 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
524 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
525 }
526
527 #ifdef CONFIG_PM
528
529 /*
530 * Restore the MMC host context, if it was lost as result of a
531 * power state change.
532 */
533 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
534 {
535 struct mmc_ios *ios = &host->mmc->ios;
536 struct omap_mmc_platform_data *pdata = host->pdata;
537 int context_loss = 0;
538 u32 hctl, capa, con;
539 u16 dsor = 0;
540 unsigned long timeout;
541
542 if (pdata->get_context_loss_count) {
543 context_loss = pdata->get_context_loss_count(host->dev);
544 if (context_loss < 0)
545 return 1;
546 }
547
548 dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
549 context_loss == host->context_loss ? "not " : "");
550 if (host->context_loss == context_loss)
551 return 1;
552
553 /* Wait for hardware reset */
554 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
555 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
556 && time_before(jiffies, timeout))
557 ;
558
559 /* Do software reset */
560 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
561 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
562 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
563 && time_before(jiffies, timeout))
564 ;
565
566 OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
567 OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
568
569 if (host->id == OMAP_MMC1_DEVID) {
570 if (host->power_mode != MMC_POWER_OFF &&
571 (1 << ios->vdd) <= MMC_VDD_23_24)
572 hctl = SDVS18;
573 else
574 hctl = SDVS30;
575 capa = VS30 | VS18;
576 } else {
577 hctl = SDVS18;
578 capa = VS18;
579 }
580
581 OMAP_HSMMC_WRITE(host->base, HCTL,
582 OMAP_HSMMC_READ(host->base, HCTL) | hctl);
583
584 OMAP_HSMMC_WRITE(host->base, CAPA,
585 OMAP_HSMMC_READ(host->base, CAPA) | capa);
586
587 OMAP_HSMMC_WRITE(host->base, HCTL,
588 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
589
590 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
591 while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
592 && time_before(jiffies, timeout))
593 ;
594
595 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
596 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
597 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
598
599 /* Do not initialize card-specific things if the power is off */
600 if (host->power_mode == MMC_POWER_OFF)
601 goto out;
602
603 con = OMAP_HSMMC_READ(host->base, CON);
604 switch (ios->bus_width) {
605 case MMC_BUS_WIDTH_8:
606 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
607 break;
608 case MMC_BUS_WIDTH_4:
609 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
610 OMAP_HSMMC_WRITE(host->base, HCTL,
611 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
612 break;
613 case MMC_BUS_WIDTH_1:
614 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
615 OMAP_HSMMC_WRITE(host->base, HCTL,
616 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
617 break;
618 }
619
620 if (ios->clock) {
621 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
622 if (dsor < 1)
623 dsor = 1;
624
625 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
626 dsor++;
627
628 if (dsor > 250)
629 dsor = 250;
630 }
631
632 OMAP_HSMMC_WRITE(host->base, SYSCTL,
633 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
634 OMAP_HSMMC_WRITE(host->base, SYSCTL, (dsor << 6) | (DTO << 16));
635 OMAP_HSMMC_WRITE(host->base, SYSCTL,
636 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
637
638 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
639 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
640 && time_before(jiffies, timeout))
641 ;
642
643 OMAP_HSMMC_WRITE(host->base, SYSCTL,
644 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
645
646 con = OMAP_HSMMC_READ(host->base, CON);
647 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
648 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
649 else
650 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
651 out:
652 host->context_loss = context_loss;
653
654 dev_dbg(mmc_dev(host->mmc), "context is restored\n");
655 return 0;
656 }
657
658 /*
659 * Save the MMC host context (store the number of power state changes so far).
660 */
661 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
662 {
663 struct omap_mmc_platform_data *pdata = host->pdata;
664 int context_loss;
665
666 if (pdata->get_context_loss_count) {
667 context_loss = pdata->get_context_loss_count(host->dev);
668 if (context_loss < 0)
669 return;
670 host->context_loss = context_loss;
671 }
672 }
673
674 #else
675
676 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
677 {
678 return 0;
679 }
680
681 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
682 {
683 }
684
685 #endif
686
687 /*
688 * Send init stream sequence to card
689 * before sending IDLE command
690 */
691 static void send_init_stream(struct omap_hsmmc_host *host)
692 {
693 int reg = 0;
694 unsigned long timeout;
695
696 if (host->protect_card)
697 return;
698
699 disable_irq(host->irq);
700 OMAP_HSMMC_WRITE(host->base, CON,
701 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
702 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
703
704 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
705 while ((reg != CC) && time_before(jiffies, timeout))
706 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
707
708 OMAP_HSMMC_WRITE(host->base, CON,
709 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
710
711 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
712 OMAP_HSMMC_READ(host->base, STAT);
713
714 enable_irq(host->irq);
715 }
716
717 static inline
718 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
719 {
720 int r = 1;
721
722 if (mmc_slot(host).get_cover_state)
723 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
724 return r;
725 }
726
727 static ssize_t
728 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
729 char *buf)
730 {
731 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
732 struct omap_hsmmc_host *host = mmc_priv(mmc);
733
734 return sprintf(buf, "%s\n",
735 omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
736 }
737
738 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
739
740 static ssize_t
741 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
742 char *buf)
743 {
744 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
745 struct omap_hsmmc_host *host = mmc_priv(mmc);
746
747 return sprintf(buf, "%s\n", mmc_slot(host).name);
748 }
749
750 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
751
752 /*
753 * Configure the response type and send the cmd.
754 */
755 static void
756 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
757 struct mmc_data *data)
758 {
759 int cmdreg = 0, resptype = 0, cmdtype = 0;
760
761 dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
762 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
763 host->cmd = cmd;
764
765 /*
766 * Clear status bits and enable interrupts
767 */
768 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
769 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
770
771 if (host->use_dma)
772 OMAP_HSMMC_WRITE(host->base, IE,
773 INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
774 else
775 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
776
777 host->response_busy = 0;
778 if (cmd->flags & MMC_RSP_PRESENT) {
779 if (cmd->flags & MMC_RSP_136)
780 resptype = 1;
781 else if (cmd->flags & MMC_RSP_BUSY) {
782 resptype = 3;
783 host->response_busy = 1;
784 } else
785 resptype = 2;
786 }
787
788 /*
789 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
790 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
791 * a val of 0x3, rest 0x0.
792 */
793 if (cmd == host->mrq->stop)
794 cmdtype = 0x3;
795
796 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
797
798 if (data) {
799 cmdreg |= DP_SELECT | MSBS | BCE;
800 if (data->flags & MMC_DATA_READ)
801 cmdreg |= DDIR;
802 else
803 cmdreg &= ~(DDIR);
804 }
805
806 if (host->use_dma)
807 cmdreg |= DMA_EN;
808
809 /*
810 * In an interrupt context (i.e. STOP command), the spinlock is unlocked
811 * by the interrupt handler, otherwise (i.e. for a new request) it is
812 * unlocked here.
813 */
814 if (!in_interrupt())
815 spin_unlock_irqrestore(&host->irq_lock, host->flags);
816
817 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
818 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
819 }
820
821 static int
822 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
823 {
824 if (data->flags & MMC_DATA_WRITE)
825 return DMA_TO_DEVICE;
826 else
827 return DMA_FROM_DEVICE;
828 }
829
830 /*
831 * Notify the transfer complete to MMC core
832 */
833 static void
834 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
835 {
836 if (!data) {
837 struct mmc_request *mrq = host->mrq;
838
839 /* TC before CC from CMD6 - don't know why, but it happens */
840 if (host->cmd && host->cmd->opcode == 6 &&
841 host->response_busy) {
842 host->response_busy = 0;
843 return;
844 }
845
846 host->mrq = NULL;
847 mmc_request_done(host->mmc, mrq);
848 return;
849 }
850
851 host->data = NULL;
852
853 if (host->use_dma && host->dma_ch != -1)
854 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
855 omap_hsmmc_get_dma_dir(host, data));
856
857 if (!data->error)
858 data->bytes_xfered += data->blocks * (data->blksz);
859 else
860 data->bytes_xfered = 0;
861
862 if (!data->stop) {
863 host->mrq = NULL;
864 mmc_request_done(host->mmc, data->mrq);
865 return;
866 }
867 omap_hsmmc_start_command(host, data->stop, NULL);
868 }
869
870 /*
871 * Notify the core about command completion
872 */
873 static void
874 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
875 {
876 host->cmd = NULL;
877
878 if (cmd->flags & MMC_RSP_PRESENT) {
879 if (cmd->flags & MMC_RSP_136) {
880 /* response type 2 */
881 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
882 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
883 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
884 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
885 } else {
886 /* response types 1, 1b, 3, 4, 5, 6 */
887 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
888 }
889 }
890 if ((host->data == NULL && !host->response_busy) || cmd->error) {
891 host->mrq = NULL;
892 mmc_request_done(host->mmc, cmd->mrq);
893 }
894 }
895
896 /*
897 * DMA clean up for command errors
898 */
899 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
900 {
901 host->data->error = errno;
902
903 if (host->use_dma && host->dma_ch != -1) {
904 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
905 omap_hsmmc_get_dma_dir(host, host->data));
906 omap_free_dma(host->dma_ch);
907 host->dma_ch = -1;
908 up(&host->sem);
909 }
910 host->data = NULL;
911 }
912
913 /*
914 * Readable error output
915 */
916 #ifdef CONFIG_MMC_DEBUG
917 static void omap_hsmmc_report_irq(struct omap_hsmmc_host *host, u32 status)
918 {
919 /* --- means reserved bit without definition at documentation */
920 static const char *omap_hsmmc_status_bits[] = {
921 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
922 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
923 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
924 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
925 };
926 char res[256];
927 char *buf = res;
928 int len, i;
929
930 len = sprintf(buf, "MMC IRQ 0x%x :", status);
931 buf += len;
932
933 for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
934 if (status & (1 << i)) {
935 len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
936 buf += len;
937 }
938
939 dev_dbg(mmc_dev(host->mmc), "%s\n", res);
940 }
941 #endif /* CONFIG_MMC_DEBUG */
942
943 /*
944 * MMC controller internal state machines reset
945 *
946 * Used to reset command or data internal state machines, using respectively
947 * SRC or SRD bit of SYSCTL register
948 * Can be called from interrupt context
949 */
950 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
951 unsigned long bit)
952 {
953 unsigned long i = 0;
954 unsigned long limit = (loops_per_jiffy *
955 msecs_to_jiffies(MMC_TIMEOUT_MS));
956
957 OMAP_HSMMC_WRITE(host->base, SYSCTL,
958 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
959
960 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
961 (i++ < limit))
962 cpu_relax();
963
964 if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
965 dev_err(mmc_dev(host->mmc),
966 "Timeout waiting on controller reset in %s\n",
967 __func__);
968 }
969
970 /*
971 * MMC controller IRQ handler
972 */
973 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
974 {
975 struct omap_hsmmc_host *host = dev_id;
976 struct mmc_data *data;
977 int end_cmd = 0, end_trans = 0, status;
978
979 spin_lock(&host->irq_lock);
980
981 if (host->mrq == NULL) {
982 OMAP_HSMMC_WRITE(host->base, STAT,
983 OMAP_HSMMC_READ(host->base, STAT));
984 /* Flush posted write */
985 OMAP_HSMMC_READ(host->base, STAT);
986 spin_unlock(&host->irq_lock);
987 return IRQ_HANDLED;
988 }
989
990 data = host->data;
991 status = OMAP_HSMMC_READ(host->base, STAT);
992 dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
993
994 if (status & ERR) {
995 #ifdef CONFIG_MMC_DEBUG
996 omap_hsmmc_report_irq(host, status);
997 #endif
998 if ((status & CMD_TIMEOUT) ||
999 (status & CMD_CRC)) {
1000 if (host->cmd) {
1001 if (status & CMD_TIMEOUT) {
1002 omap_hsmmc_reset_controller_fsm(host,
1003 SRC);
1004 host->cmd->error = -ETIMEDOUT;
1005 } else {
1006 host->cmd->error = -EILSEQ;
1007 }
1008 end_cmd = 1;
1009 }
1010 if (host->data || host->response_busy) {
1011 if (host->data)
1012 omap_hsmmc_dma_cleanup(host,
1013 -ETIMEDOUT);
1014 host->response_busy = 0;
1015 omap_hsmmc_reset_controller_fsm(host, SRD);
1016 }
1017 }
1018 if ((status & DATA_TIMEOUT) ||
1019 (status & DATA_CRC)) {
1020 if (host->data || host->response_busy) {
1021 int err = (status & DATA_TIMEOUT) ?
1022 -ETIMEDOUT : -EILSEQ;
1023
1024 if (host->data)
1025 omap_hsmmc_dma_cleanup(host, err);
1026 else
1027 host->mrq->cmd->error = err;
1028 host->response_busy = 0;
1029 omap_hsmmc_reset_controller_fsm(host, SRD);
1030 end_trans = 1;
1031 }
1032 }
1033 if (status & CARD_ERR) {
1034 dev_dbg(mmc_dev(host->mmc),
1035 "Ignoring card err CMD%d\n", host->cmd->opcode);
1036 if (host->cmd)
1037 end_cmd = 1;
1038 if (host->data)
1039 end_trans = 1;
1040 }
1041 }
1042
1043 OMAP_HSMMC_WRITE(host->base, STAT, status);
1044 /* Flush posted write */
1045 OMAP_HSMMC_READ(host->base, STAT);
1046
1047 if (end_cmd || ((status & CC) && host->cmd))
1048 omap_hsmmc_cmd_done(host, host->cmd);
1049 if ((end_trans || (status & TC)) && host->mrq)
1050 omap_hsmmc_xfer_done(host, data);
1051
1052 spin_unlock(&host->irq_lock);
1053
1054 return IRQ_HANDLED;
1055 }
1056
1057 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1058 {
1059 unsigned long i;
1060
1061 OMAP_HSMMC_WRITE(host->base, HCTL,
1062 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1063 for (i = 0; i < loops_per_jiffy; i++) {
1064 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1065 break;
1066 cpu_relax();
1067 }
1068 }
1069
1070 /*
1071 * Switch MMC interface voltage ... only relevant for MMC1.
1072 *
1073 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1074 * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1075 * Some chips, like eMMC ones, use internal transceivers.
1076 */
1077 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1078 {
1079 u32 reg_val = 0;
1080 int ret;
1081
1082 /* Disable the clocks */
1083 clk_disable(host->fclk);
1084 clk_disable(host->iclk);
1085 if (host->got_dbclk)
1086 clk_disable(host->dbclk);
1087
1088 /* Turn the power off */
1089 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1090
1091 /* Turn the power ON with given VDD 1.8 or 3.0v */
1092 if (!ret)
1093 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1094 vdd);
1095 clk_enable(host->iclk);
1096 clk_enable(host->fclk);
1097 if (host->got_dbclk)
1098 clk_enable(host->dbclk);
1099
1100 if (ret != 0)
1101 goto err;
1102
1103 OMAP_HSMMC_WRITE(host->base, HCTL,
1104 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1105 reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1106
1107 /*
1108 * If a MMC dual voltage card is detected, the set_ios fn calls
1109 * this fn with VDD bit set for 1.8V. Upon card removal from the
1110 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1111 *
1112 * Cope with a bit of slop in the range ... per data sheets:
1113 * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1114 * but recommended values are 1.71V to 1.89V
1115 * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1116 * but recommended values are 2.7V to 3.3V
1117 *
1118 * Board setup code shouldn't permit anything very out-of-range.
1119 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1120 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1121 */
1122 if ((1 << vdd) <= MMC_VDD_23_24)
1123 reg_val |= SDVS18;
1124 else
1125 reg_val |= SDVS30;
1126
1127 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1128 set_sd_bus_power(host);
1129
1130 return 0;
1131 err:
1132 dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1133 return ret;
1134 }
1135
1136 /* Protect the card while the cover is open */
1137 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1138 {
1139 if (!mmc_slot(host).get_cover_state)
1140 return;
1141
1142 host->reqs_blocked = 0;
1143 if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1144 if (host->protect_card) {
1145 printk(KERN_INFO "%s: cover is closed, "
1146 "card is now accessible\n",
1147 mmc_hostname(host->mmc));
1148 host->protect_card = 0;
1149 }
1150 } else {
1151 if (!host->protect_card) {
1152 printk(KERN_INFO "%s: cover is open, "
1153 "card is now inaccessible\n",
1154 mmc_hostname(host->mmc));
1155 host->protect_card = 1;
1156 }
1157 }
1158 }
1159
1160 /*
1161 * Work Item to notify the core about card insertion/removal
1162 */
1163 static void omap_hsmmc_detect(struct work_struct *work)
1164 {
1165 struct omap_hsmmc_host *host =
1166 container_of(work, struct omap_hsmmc_host, mmc_carddetect_work);
1167 struct omap_mmc_slot_data *slot = &mmc_slot(host);
1168 int carddetect;
1169
1170 if (host->suspended)
1171 return;
1172
1173 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1174
1175 if (slot->card_detect)
1176 carddetect = slot->card_detect(host->dev, host->slot_id);
1177 else {
1178 omap_hsmmc_protect_card(host);
1179 carddetect = -ENOSYS;
1180 }
1181
1182 if (carddetect) {
1183 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1184 } else {
1185 mmc_host_enable(host->mmc);
1186 omap_hsmmc_reset_controller_fsm(host, SRD);
1187 mmc_host_lazy_disable(host->mmc);
1188
1189 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1190 }
1191 }
1192
1193 /*
1194 * ISR for handling card insertion and removal
1195 */
1196 static irqreturn_t omap_hsmmc_cd_handler(int irq, void *dev_id)
1197 {
1198 struct omap_hsmmc_host *host = (struct omap_hsmmc_host *)dev_id;
1199
1200 if (host->suspended)
1201 return IRQ_HANDLED;
1202 schedule_work(&host->mmc_carddetect_work);
1203
1204 return IRQ_HANDLED;
1205 }
1206
1207 static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
1208 struct mmc_data *data)
1209 {
1210 int sync_dev;
1211
1212 if (data->flags & MMC_DATA_WRITE)
1213 sync_dev = host->dma_line_tx;
1214 else
1215 sync_dev = host->dma_line_rx;
1216 return sync_dev;
1217 }
1218
1219 static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
1220 struct mmc_data *data,
1221 struct scatterlist *sgl)
1222 {
1223 int blksz, nblk, dma_ch;
1224
1225 dma_ch = host->dma_ch;
1226 if (data->flags & MMC_DATA_WRITE) {
1227 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1228 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1229 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1230 sg_dma_address(sgl), 0, 0);
1231 } else {
1232 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1233 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1234 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1235 sg_dma_address(sgl), 0, 0);
1236 }
1237
1238 blksz = host->data->blksz;
1239 nblk = sg_dma_len(sgl) / blksz;
1240
1241 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
1242 blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
1243 omap_hsmmc_get_dma_sync_dev(host, data),
1244 !(data->flags & MMC_DATA_WRITE));
1245
1246 omap_start_dma(dma_ch);
1247 }
1248
1249 /*
1250 * DMA call back function
1251 */
1252 static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *data)
1253 {
1254 struct omap_hsmmc_host *host = data;
1255
1256 if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ)
1257 dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n");
1258
1259 if (host->dma_ch < 0)
1260 return;
1261
1262 host->dma_sg_idx++;
1263 if (host->dma_sg_idx < host->dma_len) {
1264 /* Fire up the next transfer. */
1265 omap_hsmmc_config_dma_params(host, host->data,
1266 host->data->sg + host->dma_sg_idx);
1267 return;
1268 }
1269
1270 omap_free_dma(host->dma_ch);
1271 host->dma_ch = -1;
1272 /*
1273 * DMA Callback: run in interrupt context.
1274 * mutex_unlock will throw a kernel warning if used.
1275 */
1276 up(&host->sem);
1277 }
1278
1279 /*
1280 * Routine to configure and start DMA for the MMC card
1281 */
1282 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1283 struct mmc_request *req)
1284 {
1285 int dma_ch = 0, ret = 0, err = 1, i;
1286 struct mmc_data *data = req->data;
1287
1288 /* Sanity check: all the SG entries must be aligned by block size. */
1289 for (i = 0; i < data->sg_len; i++) {
1290 struct scatterlist *sgl;
1291
1292 sgl = data->sg + i;
1293 if (sgl->length % data->blksz)
1294 return -EINVAL;
1295 }
1296 if ((data->blksz % 4) != 0)
1297 /* REVISIT: The MMC buffer increments only when MSB is written.
1298 * Return error for blksz which is non multiple of four.
1299 */
1300 return -EINVAL;
1301
1302 /*
1303 * If for some reason the DMA transfer is still active,
1304 * we wait for timeout period and free the dma
1305 */
1306 if (host->dma_ch != -1) {
1307 set_current_state(TASK_UNINTERRUPTIBLE);
1308 schedule_timeout(100);
1309 if (down_trylock(&host->sem)) {
1310 omap_free_dma(host->dma_ch);
1311 host->dma_ch = -1;
1312 up(&host->sem);
1313 return err;
1314 }
1315 } else {
1316 if (down_trylock(&host->sem))
1317 return err;
1318 }
1319
1320 ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
1321 "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
1322 if (ret != 0) {
1323 dev_err(mmc_dev(host->mmc),
1324 "%s: omap_request_dma() failed with %d\n",
1325 mmc_hostname(host->mmc), ret);
1326 return ret;
1327 }
1328
1329 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1330 data->sg_len, omap_hsmmc_get_dma_dir(host, data));
1331 host->dma_ch = dma_ch;
1332 host->dma_sg_idx = 0;
1333
1334 omap_hsmmc_config_dma_params(host, data, data->sg);
1335
1336 return 0;
1337 }
1338
1339 static void set_data_timeout(struct omap_hsmmc_host *host,
1340 unsigned int timeout_ns,
1341 unsigned int timeout_clks)
1342 {
1343 unsigned int timeout, cycle_ns;
1344 uint32_t reg, clkd, dto = 0;
1345
1346 reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1347 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1348 if (clkd == 0)
1349 clkd = 1;
1350
1351 cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1352 timeout = timeout_ns / cycle_ns;
1353 timeout += timeout_clks;
1354 if (timeout) {
1355 while ((timeout & 0x80000000) == 0) {
1356 dto += 1;
1357 timeout <<= 1;
1358 }
1359 dto = 31 - dto;
1360 timeout <<= 1;
1361 if (timeout && dto)
1362 dto += 1;
1363 if (dto >= 13)
1364 dto -= 13;
1365 else
1366 dto = 0;
1367 if (dto > 14)
1368 dto = 14;
1369 }
1370
1371 reg &= ~DTO_MASK;
1372 reg |= dto << DTO_SHIFT;
1373 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1374 }
1375
1376 /*
1377 * Configure block length for MMC/SD cards and initiate the transfer.
1378 */
1379 static int
1380 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1381 {
1382 int ret;
1383 host->data = req->data;
1384
1385 if (req->data == NULL) {
1386 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1387 /*
1388 * Set an arbitrary 100ms data timeout for commands with
1389 * busy signal.
1390 */
1391 if (req->cmd->flags & MMC_RSP_BUSY)
1392 set_data_timeout(host, 100000000U, 0);
1393 return 0;
1394 }
1395
1396 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1397 | (req->data->blocks << 16));
1398 set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1399
1400 if (host->use_dma) {
1401 ret = omap_hsmmc_start_dma_transfer(host, req);
1402 if (ret != 0) {
1403 dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1404 return ret;
1405 }
1406 }
1407 return 0;
1408 }
1409
1410 /*
1411 * Request function. for read/write operation
1412 */
1413 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1414 {
1415 struct omap_hsmmc_host *host = mmc_priv(mmc);
1416 int err;
1417
1418 /*
1419 * Prevent races with the interrupt handler because of unexpected
1420 * interrupts, but not if we are already in interrupt context i.e.
1421 * retries.
1422 */
1423 if (!in_interrupt()) {
1424 spin_lock_irqsave(&host->irq_lock, host->flags);
1425 /*
1426 * Protect the card from I/O if there is a possibility
1427 * it can be removed.
1428 */
1429 if (host->protect_card) {
1430 if (host->reqs_blocked < 3) {
1431 /*
1432 * Ensure the controller is left in a consistent
1433 * state by resetting the command and data state
1434 * machines.
1435 */
1436 omap_hsmmc_reset_controller_fsm(host, SRD);
1437 omap_hsmmc_reset_controller_fsm(host, SRC);
1438 host->reqs_blocked += 1;
1439 }
1440 req->cmd->error = -EBADF;
1441 if (req->data)
1442 req->data->error = -EBADF;
1443 spin_unlock_irqrestore(&host->irq_lock, host->flags);
1444 mmc_request_done(mmc, req);
1445 return;
1446 } else if (host->reqs_blocked)
1447 host->reqs_blocked = 0;
1448 }
1449 WARN_ON(host->mrq != NULL);
1450 host->mrq = req;
1451 err = omap_hsmmc_prepare_data(host, req);
1452 if (err) {
1453 req->cmd->error = err;
1454 if (req->data)
1455 req->data->error = err;
1456 host->mrq = NULL;
1457 if (!in_interrupt())
1458 spin_unlock_irqrestore(&host->irq_lock, host->flags);
1459 mmc_request_done(mmc, req);
1460 return;
1461 }
1462
1463 omap_hsmmc_start_command(host, req->cmd, req->data);
1464 }
1465
1466 /* Routine to configure clock values. Exposed API to core */
1467 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1468 {
1469 struct omap_hsmmc_host *host = mmc_priv(mmc);
1470 u16 dsor = 0;
1471 unsigned long regval;
1472 unsigned long timeout;
1473 u32 con;
1474 int do_send_init_stream = 0;
1475
1476 mmc_host_enable(host->mmc);
1477
1478 if (ios->power_mode != host->power_mode) {
1479 switch (ios->power_mode) {
1480 case MMC_POWER_OFF:
1481 mmc_slot(host).set_power(host->dev, host->slot_id,
1482 0, 0);
1483 host->vdd = 0;
1484 break;
1485 case MMC_POWER_UP:
1486 mmc_slot(host).set_power(host->dev, host->slot_id,
1487 1, ios->vdd);
1488 host->vdd = ios->vdd;
1489 break;
1490 case MMC_POWER_ON:
1491 do_send_init_stream = 1;
1492 break;
1493 }
1494 host->power_mode = ios->power_mode;
1495 }
1496
1497 /* FIXME: set registers based only on changes to ios */
1498
1499 con = OMAP_HSMMC_READ(host->base, CON);
1500 switch (mmc->ios.bus_width) {
1501 case MMC_BUS_WIDTH_8:
1502 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
1503 break;
1504 case MMC_BUS_WIDTH_4:
1505 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1506 OMAP_HSMMC_WRITE(host->base, HCTL,
1507 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
1508 break;
1509 case MMC_BUS_WIDTH_1:
1510 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1511 OMAP_HSMMC_WRITE(host->base, HCTL,
1512 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
1513 break;
1514 }
1515
1516 if (host->id == OMAP_MMC1_DEVID) {
1517 /* Only MMC1 can interface at 3V without some flavor
1518 * of external transceiver; but they all handle 1.8V.
1519 */
1520 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1521 (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1522 /*
1523 * The mmc_select_voltage fn of the core does
1524 * not seem to set the power_mode to
1525 * MMC_POWER_UP upon recalculating the voltage.
1526 * vdd 1.8v.
1527 */
1528 if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1529 dev_dbg(mmc_dev(host->mmc),
1530 "Switch operation failed\n");
1531 }
1532 }
1533
1534 if (ios->clock) {
1535 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
1536 if (dsor < 1)
1537 dsor = 1;
1538
1539 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
1540 dsor++;
1541
1542 if (dsor > 250)
1543 dsor = 250;
1544 }
1545 omap_hsmmc_stop_clock(host);
1546 regval = OMAP_HSMMC_READ(host->base, SYSCTL);
1547 regval = regval & ~(CLKD_MASK);
1548 regval = regval | (dsor << 6) | (DTO << 16);
1549 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
1550 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1551 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
1552
1553 /* Wait till the ICS bit is set */
1554 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
1555 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
1556 && time_before(jiffies, timeout))
1557 msleep(1);
1558
1559 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1560 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
1561
1562 if (do_send_init_stream)
1563 send_init_stream(host);
1564
1565 con = OMAP_HSMMC_READ(host->base, CON);
1566 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
1567 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
1568 else
1569 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
1570
1571 if (host->power_mode == MMC_POWER_OFF)
1572 mmc_host_disable(host->mmc);
1573 else
1574 mmc_host_lazy_disable(host->mmc);
1575 }
1576
1577 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1578 {
1579 struct omap_hsmmc_host *host = mmc_priv(mmc);
1580
1581 if (!mmc_slot(host).card_detect)
1582 return -ENOSYS;
1583 return mmc_slot(host).card_detect(host->dev, host->slot_id);
1584 }
1585
1586 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1587 {
1588 struct omap_hsmmc_host *host = mmc_priv(mmc);
1589
1590 if (!mmc_slot(host).get_ro)
1591 return -ENOSYS;
1592 return mmc_slot(host).get_ro(host->dev, 0);
1593 }
1594
1595 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1596 {
1597 u32 hctl, capa, value;
1598
1599 /* Only MMC1 supports 3.0V */
1600 if (host->id == OMAP_MMC1_DEVID) {
1601 hctl = SDVS30;
1602 capa = VS30 | VS18;
1603 } else {
1604 hctl = SDVS18;
1605 capa = VS18;
1606 }
1607
1608 value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1609 OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1610
1611 value = OMAP_HSMMC_READ(host->base, CAPA);
1612 OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1613
1614 /* Set the controller to AUTO IDLE mode */
1615 value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1616 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1617
1618 /* Set SD bus power bit */
1619 set_sd_bus_power(host);
1620 }
1621
1622 /*
1623 * Dynamic power saving handling, FSM:
1624 * ENABLED -> DISABLED -> CARDSLEEP / REGSLEEP -> OFF
1625 * ^___________| | |
1626 * |______________________|______________________|
1627 *
1628 * ENABLED: mmc host is fully functional
1629 * DISABLED: fclk is off
1630 * CARDSLEEP: fclk is off, card is asleep, voltage regulator is asleep
1631 * REGSLEEP: fclk is off, voltage regulator is asleep
1632 * OFF: fclk is off, voltage regulator is off
1633 *
1634 * Transition handlers return the timeout for the next state transition
1635 * or negative error.
1636 */
1637
1638 enum {ENABLED = 0, DISABLED, CARDSLEEP, REGSLEEP, OFF};
1639
1640 /* Handler for [ENABLED -> DISABLED] transition */
1641 static int omap_hsmmc_enabled_to_disabled(struct omap_hsmmc_host *host)
1642 {
1643 omap_hsmmc_context_save(host);
1644 clk_disable(host->fclk);
1645 host->dpm_state = DISABLED;
1646
1647 dev_dbg(mmc_dev(host->mmc), "ENABLED -> DISABLED\n");
1648
1649 if (host->power_mode == MMC_POWER_OFF)
1650 return 0;
1651
1652 return OMAP_MMC_SLEEP_TIMEOUT;
1653 }
1654
1655 /* Handler for [DISABLED -> REGSLEEP / CARDSLEEP] transition */
1656 static int omap_hsmmc_disabled_to_sleep(struct omap_hsmmc_host *host)
1657 {
1658 int err, new_state;
1659
1660 if (!mmc_try_claim_host(host->mmc))
1661 return 0;
1662
1663 clk_enable(host->fclk);
1664 omap_hsmmc_context_restore(host);
1665 if (mmc_card_can_sleep(host->mmc)) {
1666 err = mmc_card_sleep(host->mmc);
1667 if (err < 0) {
1668 clk_disable(host->fclk);
1669 mmc_release_host(host->mmc);
1670 return err;
1671 }
1672 new_state = CARDSLEEP;
1673 } else {
1674 new_state = REGSLEEP;
1675 }
1676 if (mmc_slot(host).set_sleep)
1677 mmc_slot(host).set_sleep(host->dev, host->slot_id, 1, 0,
1678 new_state == CARDSLEEP);
1679 /* FIXME: turn off bus power and perhaps interrupts too */
1680 clk_disable(host->fclk);
1681 host->dpm_state = new_state;
1682
1683 mmc_release_host(host->mmc);
1684
1685 dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n",
1686 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1687
1688 if (mmc_slot(host).no_off)
1689 return 0;
1690
1691 if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1692 mmc_slot(host).card_detect ||
1693 (mmc_slot(host).get_cover_state &&
1694 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))
1695 return OMAP_MMC_OFF_TIMEOUT;
1696
1697 return 0;
1698 }
1699
1700 /* Handler for [REGSLEEP / CARDSLEEP -> OFF] transition */
1701 static int omap_hsmmc_sleep_to_off(struct omap_hsmmc_host *host)
1702 {
1703 if (!mmc_try_claim_host(host->mmc))
1704 return 0;
1705
1706 if (mmc_slot(host).no_off)
1707 return 0;
1708
1709 if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1710 mmc_slot(host).card_detect ||
1711 (mmc_slot(host).get_cover_state &&
1712 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))) {
1713 mmc_release_host(host->mmc);
1714 return 0;
1715 }
1716
1717 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1718 host->vdd = 0;
1719 host->power_mode = MMC_POWER_OFF;
1720
1721 dev_dbg(mmc_dev(host->mmc), "%s -> OFF\n",
1722 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1723
1724 host->dpm_state = OFF;
1725
1726 mmc_release_host(host->mmc);
1727
1728 return 0;
1729 }
1730
1731 /* Handler for [DISABLED -> ENABLED] transition */
1732 static int omap_hsmmc_disabled_to_enabled(struct omap_hsmmc_host *host)
1733 {
1734 int err;
1735
1736 err = clk_enable(host->fclk);
1737 if (err < 0)
1738 return err;
1739
1740 omap_hsmmc_context_restore(host);
1741 host->dpm_state = ENABLED;
1742
1743 dev_dbg(mmc_dev(host->mmc), "DISABLED -> ENABLED\n");
1744
1745 return 0;
1746 }
1747
1748 /* Handler for [SLEEP -> ENABLED] transition */
1749 static int omap_hsmmc_sleep_to_enabled(struct omap_hsmmc_host *host)
1750 {
1751 if (!mmc_try_claim_host(host->mmc))
1752 return 0;
1753
1754 clk_enable(host->fclk);
1755 omap_hsmmc_context_restore(host);
1756 if (mmc_slot(host).set_sleep)
1757 mmc_slot(host).set_sleep(host->dev, host->slot_id, 0,
1758 host->vdd, host->dpm_state == CARDSLEEP);
1759 if (mmc_card_can_sleep(host->mmc))
1760 mmc_card_awake(host->mmc);
1761
1762 dev_dbg(mmc_dev(host->mmc), "%s -> ENABLED\n",
1763 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1764
1765 host->dpm_state = ENABLED;
1766
1767 mmc_release_host(host->mmc);
1768
1769 return 0;
1770 }
1771
1772 /* Handler for [OFF -> ENABLED] transition */
1773 static int omap_hsmmc_off_to_enabled(struct omap_hsmmc_host *host)
1774 {
1775 clk_enable(host->fclk);
1776
1777 omap_hsmmc_context_restore(host);
1778 omap_hsmmc_conf_bus_power(host);
1779 mmc_power_restore_host(host->mmc);
1780
1781 host->dpm_state = ENABLED;
1782
1783 dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n");
1784
1785 return 0;
1786 }
1787
1788 /*
1789 * Bring MMC host to ENABLED from any other PM state.
1790 */
1791 static int omap_hsmmc_enable(struct mmc_host *mmc)
1792 {
1793 struct omap_hsmmc_host *host = mmc_priv(mmc);
1794
1795 switch (host->dpm_state) {
1796 case DISABLED:
1797 return omap_hsmmc_disabled_to_enabled(host);
1798 case CARDSLEEP:
1799 case REGSLEEP:
1800 return omap_hsmmc_sleep_to_enabled(host);
1801 case OFF:
1802 return omap_hsmmc_off_to_enabled(host);
1803 default:
1804 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1805 return -EINVAL;
1806 }
1807 }
1808
1809 /*
1810 * Bring MMC host in PM state (one level deeper).
1811 */
1812 static int omap_hsmmc_disable(struct mmc_host *mmc, int lazy)
1813 {
1814 struct omap_hsmmc_host *host = mmc_priv(mmc);
1815
1816 switch (host->dpm_state) {
1817 case ENABLED: {
1818 int delay;
1819
1820 delay = omap_hsmmc_enabled_to_disabled(host);
1821 if (lazy || delay < 0)
1822 return delay;
1823 return 0;
1824 }
1825 case DISABLED:
1826 return omap_hsmmc_disabled_to_sleep(host);
1827 case CARDSLEEP:
1828 case REGSLEEP:
1829 return omap_hsmmc_sleep_to_off(host);
1830 default:
1831 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1832 return -EINVAL;
1833 }
1834 }
1835
1836 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1837 {
1838 struct omap_hsmmc_host *host = mmc_priv(mmc);
1839 int err;
1840
1841 err = clk_enable(host->fclk);
1842 if (err)
1843 return err;
1844 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
1845 omap_hsmmc_context_restore(host);
1846 return 0;
1847 }
1848
1849 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
1850 {
1851 struct omap_hsmmc_host *host = mmc_priv(mmc);
1852
1853 omap_hsmmc_context_save(host);
1854 clk_disable(host->fclk);
1855 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
1856 return 0;
1857 }
1858
1859 static const struct mmc_host_ops omap_hsmmc_ops = {
1860 .enable = omap_hsmmc_enable_fclk,
1861 .disable = omap_hsmmc_disable_fclk,
1862 .request = omap_hsmmc_request,
1863 .set_ios = omap_hsmmc_set_ios,
1864 .get_cd = omap_hsmmc_get_cd,
1865 .get_ro = omap_hsmmc_get_ro,
1866 /* NYET -- enable_sdio_irq */
1867 };
1868
1869 static const struct mmc_host_ops omap_hsmmc_ps_ops = {
1870 .enable = omap_hsmmc_enable,
1871 .disable = omap_hsmmc_disable,
1872 .request = omap_hsmmc_request,
1873 .set_ios = omap_hsmmc_set_ios,
1874 .get_cd = omap_hsmmc_get_cd,
1875 .get_ro = omap_hsmmc_get_ro,
1876 /* NYET -- enable_sdio_irq */
1877 };
1878
1879 #ifdef CONFIG_DEBUG_FS
1880
1881 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1882 {
1883 struct mmc_host *mmc = s->private;
1884 struct omap_hsmmc_host *host = mmc_priv(mmc);
1885 int context_loss = 0;
1886
1887 if (host->pdata->get_context_loss_count)
1888 context_loss = host->pdata->get_context_loss_count(host->dev);
1889
1890 seq_printf(s, "mmc%d:\n"
1891 " enabled:\t%d\n"
1892 " dpm_state:\t%d\n"
1893 " nesting_cnt:\t%d\n"
1894 " ctx_loss:\t%d:%d\n"
1895 "\nregs:\n",
1896 mmc->index, mmc->enabled ? 1 : 0,
1897 host->dpm_state, mmc->nesting_cnt,
1898 host->context_loss, context_loss);
1899
1900 if (host->suspended || host->dpm_state == OFF) {
1901 seq_printf(s, "host suspended, can't read registers\n");
1902 return 0;
1903 }
1904
1905 if (clk_enable(host->fclk) != 0) {
1906 seq_printf(s, "can't read the regs\n");
1907 return 0;
1908 }
1909
1910 seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1911 OMAP_HSMMC_READ(host->base, SYSCONFIG));
1912 seq_printf(s, "CON:\t\t0x%08x\n",
1913 OMAP_HSMMC_READ(host->base, CON));
1914 seq_printf(s, "HCTL:\t\t0x%08x\n",
1915 OMAP_HSMMC_READ(host->base, HCTL));
1916 seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1917 OMAP_HSMMC_READ(host->base, SYSCTL));
1918 seq_printf(s, "IE:\t\t0x%08x\n",
1919 OMAP_HSMMC_READ(host->base, IE));
1920 seq_printf(s, "ISE:\t\t0x%08x\n",
1921 OMAP_HSMMC_READ(host->base, ISE));
1922 seq_printf(s, "CAPA:\t\t0x%08x\n",
1923 OMAP_HSMMC_READ(host->base, CAPA));
1924
1925 clk_disable(host->fclk);
1926
1927 return 0;
1928 }
1929
1930 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1931 {
1932 return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1933 }
1934
1935 static const struct file_operations mmc_regs_fops = {
1936 .open = omap_hsmmc_regs_open,
1937 .read = seq_read,
1938 .llseek = seq_lseek,
1939 .release = single_release,
1940 };
1941
1942 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1943 {
1944 if (mmc->debugfs_root)
1945 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1946 mmc, &mmc_regs_fops);
1947 }
1948
1949 #else
1950
1951 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1952 {
1953 }
1954
1955 #endif
1956
1957 static int __init omap_hsmmc_probe(struct platform_device *pdev)
1958 {
1959 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1960 struct mmc_host *mmc;
1961 struct omap_hsmmc_host *host = NULL;
1962 struct resource *res;
1963 int ret, irq;
1964
1965 if (pdata == NULL) {
1966 dev_err(&pdev->dev, "Platform Data is missing\n");
1967 return -ENXIO;
1968 }
1969
1970 if (pdata->nr_slots == 0) {
1971 dev_err(&pdev->dev, "No Slots\n");
1972 return -ENXIO;
1973 }
1974
1975 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1976 irq = platform_get_irq(pdev, 0);
1977 if (res == NULL || irq < 0)
1978 return -ENXIO;
1979
1980 res = request_mem_region(res->start, res->end - res->start + 1,
1981 pdev->name);
1982 if (res == NULL)
1983 return -EBUSY;
1984
1985 ret = omap_hsmmc_gpio_init(pdata);
1986 if (ret)
1987 goto err;
1988
1989 mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1990 if (!mmc) {
1991 ret = -ENOMEM;
1992 goto err_alloc;
1993 }
1994
1995 host = mmc_priv(mmc);
1996 host->mmc = mmc;
1997 host->pdata = pdata;
1998 host->dev = &pdev->dev;
1999 host->use_dma = 1;
2000 host->dev->dma_mask = &pdata->dma_mask;
2001 host->dma_ch = -1;
2002 host->irq = irq;
2003 host->id = pdev->id;
2004 host->slot_id = 0;
2005 host->mapbase = res->start;
2006 host->base = ioremap(host->mapbase, SZ_4K);
2007 host->power_mode = MMC_POWER_OFF;
2008
2009 platform_set_drvdata(pdev, host);
2010 INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect);
2011
2012 if (mmc_slot(host).power_saving)
2013 mmc->ops = &omap_hsmmc_ps_ops;
2014 else
2015 mmc->ops = &omap_hsmmc_ops;
2016
2017 /*
2018 * If regulator_disable can only put vcc_aux to sleep then there is
2019 * no off state.
2020 */
2021 if (mmc_slot(host).vcc_aux_disable_is_sleep)
2022 mmc_slot(host).no_off = 1;
2023
2024 mmc->f_min = 400000;
2025 mmc->f_max = 52000000;
2026
2027 sema_init(&host->sem, 1);
2028 spin_lock_init(&host->irq_lock);
2029
2030 host->iclk = clk_get(&pdev->dev, "ick");
2031 if (IS_ERR(host->iclk)) {
2032 ret = PTR_ERR(host->iclk);
2033 host->iclk = NULL;
2034 goto err1;
2035 }
2036 host->fclk = clk_get(&pdev->dev, "fck");
2037 if (IS_ERR(host->fclk)) {
2038 ret = PTR_ERR(host->fclk);
2039 host->fclk = NULL;
2040 clk_put(host->iclk);
2041 goto err1;
2042 }
2043
2044 omap_hsmmc_context_save(host);
2045
2046 mmc->caps |= MMC_CAP_DISABLE;
2047 mmc_set_disable_delay(mmc, OMAP_MMC_DISABLED_TIMEOUT);
2048 /* we start off in DISABLED state */
2049 host->dpm_state = DISABLED;
2050
2051 if (mmc_host_enable(host->mmc) != 0) {
2052 clk_put(host->iclk);
2053 clk_put(host->fclk);
2054 goto err1;
2055 }
2056
2057 if (clk_enable(host->iclk) != 0) {
2058 mmc_host_disable(host->mmc);
2059 clk_put(host->iclk);
2060 clk_put(host->fclk);
2061 goto err1;
2062 }
2063
2064 if (cpu_is_omap2430()) {
2065 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
2066 /*
2067 * MMC can still work without debounce clock.
2068 */
2069 if (IS_ERR(host->dbclk))
2070 dev_warn(mmc_dev(host->mmc),
2071 "Failed to get debounce clock\n");
2072 else
2073 host->got_dbclk = 1;
2074
2075 if (host->got_dbclk)
2076 if (clk_enable(host->dbclk) != 0)
2077 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
2078 " clk failed\n");
2079 }
2080
2081 /* Since we do only SG emulation, we can have as many segs
2082 * as we want. */
2083 mmc->max_phys_segs = 1024;
2084 mmc->max_hw_segs = 1024;
2085
2086 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
2087 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
2088 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2089 mmc->max_seg_size = mmc->max_req_size;
2090
2091 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2092 MMC_CAP_WAIT_WHILE_BUSY;
2093
2094 if (mmc_slot(host).wires >= 8)
2095 mmc->caps |= MMC_CAP_8_BIT_DATA;
2096 else if (mmc_slot(host).wires >= 4)
2097 mmc->caps |= MMC_CAP_4_BIT_DATA;
2098
2099 if (mmc_slot(host).nonremovable)
2100 mmc->caps |= MMC_CAP_NONREMOVABLE;
2101
2102 omap_hsmmc_conf_bus_power(host);
2103
2104 /* Select DMA lines */
2105 switch (host->id) {
2106 case OMAP_MMC1_DEVID:
2107 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
2108 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
2109 break;
2110 case OMAP_MMC2_DEVID:
2111 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
2112 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
2113 break;
2114 case OMAP_MMC3_DEVID:
2115 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
2116 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
2117 break;
2118 case OMAP_MMC4_DEVID:
2119 host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
2120 host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
2121 break;
2122 case OMAP_MMC5_DEVID:
2123 host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
2124 host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
2125 break;
2126 default:
2127 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
2128 goto err_irq;
2129 }
2130
2131 /* Request IRQ for MMC operations */
2132 ret = request_irq(host->irq, omap_hsmmc_irq, IRQF_DISABLED,
2133 mmc_hostname(mmc), host);
2134 if (ret) {
2135 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2136 goto err_irq;
2137 }
2138
2139 if (pdata->init != NULL) {
2140 if (pdata->init(&pdev->dev) != 0) {
2141 dev_dbg(mmc_dev(host->mmc),
2142 "Unable to configure MMC IRQs\n");
2143 goto err_irq_cd_init;
2144 }
2145 }
2146
2147 if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2148 ret = omap_hsmmc_reg_get(host);
2149 if (ret)
2150 goto err_reg;
2151 host->use_reg = 1;
2152 }
2153
2154 mmc->ocr_avail = mmc_slot(host).ocr_mask;
2155
2156 /* Request IRQ for card detect */
2157 if ((mmc_slot(host).card_detect_irq)) {
2158 ret = request_irq(mmc_slot(host).card_detect_irq,
2159 omap_hsmmc_cd_handler,
2160 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
2161 | IRQF_DISABLED,
2162 mmc_hostname(mmc), host);
2163 if (ret) {
2164 dev_dbg(mmc_dev(host->mmc),
2165 "Unable to grab MMC CD IRQ\n");
2166 goto err_irq_cd;
2167 }
2168 }
2169
2170 OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);
2171 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
2172
2173 mmc_host_lazy_disable(host->mmc);
2174
2175 omap_hsmmc_protect_card(host);
2176
2177 mmc_add_host(mmc);
2178
2179 if (mmc_slot(host).name != NULL) {
2180 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2181 if (ret < 0)
2182 goto err_slot_name;
2183 }
2184 if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2185 ret = device_create_file(&mmc->class_dev,
2186 &dev_attr_cover_switch);
2187 if (ret < 0)
2188 goto err_slot_name;
2189 }
2190
2191 omap_hsmmc_debugfs(mmc);
2192
2193 return 0;
2194
2195 err_slot_name:
2196 mmc_remove_host(mmc);
2197 free_irq(mmc_slot(host).card_detect_irq, host);
2198 err_irq_cd:
2199 if (host->use_reg)
2200 omap_hsmmc_reg_put(host);
2201 err_reg:
2202 if (host->pdata->cleanup)
2203 host->pdata->cleanup(&pdev->dev);
2204 err_irq_cd_init:
2205 free_irq(host->irq, host);
2206 err_irq:
2207 mmc_host_disable(host->mmc);
2208 clk_disable(host->iclk);
2209 clk_put(host->fclk);
2210 clk_put(host->iclk);
2211 if (host->got_dbclk) {
2212 clk_disable(host->dbclk);
2213 clk_put(host->dbclk);
2214 }
2215 err1:
2216 iounmap(host->base);
2217 platform_set_drvdata(pdev, NULL);
2218 mmc_free_host(mmc);
2219 err_alloc:
2220 omap_hsmmc_gpio_free(pdata);
2221 err:
2222 release_mem_region(res->start, res->end - res->start + 1);
2223 return ret;
2224 }
2225
2226 static int omap_hsmmc_remove(struct platform_device *pdev)
2227 {
2228 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2229 struct resource *res;
2230
2231 if (host) {
2232 mmc_host_enable(host->mmc);
2233 mmc_remove_host(host->mmc);
2234 if (host->use_reg)
2235 omap_hsmmc_reg_put(host);
2236 if (host->pdata->cleanup)
2237 host->pdata->cleanup(&pdev->dev);
2238 free_irq(host->irq, host);
2239 if (mmc_slot(host).card_detect_irq)
2240 free_irq(mmc_slot(host).card_detect_irq, host);
2241 flush_scheduled_work();
2242
2243 mmc_host_disable(host->mmc);
2244 clk_disable(host->iclk);
2245 clk_put(host->fclk);
2246 clk_put(host->iclk);
2247 if (host->got_dbclk) {
2248 clk_disable(host->dbclk);
2249 clk_put(host->dbclk);
2250 }
2251
2252 mmc_free_host(host->mmc);
2253 iounmap(host->base);
2254 omap_hsmmc_gpio_free(pdev->dev.platform_data);
2255 }
2256
2257 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2258 if (res)
2259 release_mem_region(res->start, res->end - res->start + 1);
2260 platform_set_drvdata(pdev, NULL);
2261
2262 return 0;
2263 }
2264
2265 #ifdef CONFIG_PM
2266 static int omap_hsmmc_suspend(struct platform_device *pdev, pm_message_t state)
2267 {
2268 int ret = 0;
2269 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2270
2271 if (host && host->suspended)
2272 return 0;
2273
2274 if (host) {
2275 host->suspended = 1;
2276 if (host->pdata->suspend) {
2277 ret = host->pdata->suspend(&pdev->dev,
2278 host->slot_id);
2279 if (ret) {
2280 dev_dbg(mmc_dev(host->mmc),
2281 "Unable to handle MMC board"
2282 " level suspend\n");
2283 host->suspended = 0;
2284 return ret;
2285 }
2286 }
2287 cancel_work_sync(&host->mmc_carddetect_work);
2288 mmc_host_enable(host->mmc);
2289 ret = mmc_suspend_host(host->mmc, state);
2290 if (ret == 0) {
2291 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2292 OMAP_HSMMC_WRITE(host->base, IE, 0);
2293
2294
2295 OMAP_HSMMC_WRITE(host->base, HCTL,
2296 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2297 mmc_host_disable(host->mmc);
2298 clk_disable(host->iclk);
2299 if (host->got_dbclk)
2300 clk_disable(host->dbclk);
2301 } else {
2302 host->suspended = 0;
2303 if (host->pdata->resume) {
2304 ret = host->pdata->resume(&pdev->dev,
2305 host->slot_id);
2306 if (ret)
2307 dev_dbg(mmc_dev(host->mmc),
2308 "Unmask interrupt failed\n");
2309 }
2310 mmc_host_disable(host->mmc);
2311 }
2312
2313 }
2314 return ret;
2315 }
2316
2317 /* Routine to resume the MMC device */
2318 static int omap_hsmmc_resume(struct platform_device *pdev)
2319 {
2320 int ret = 0;
2321 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2322
2323 if (host && !host->suspended)
2324 return 0;
2325
2326 if (host) {
2327 ret = clk_enable(host->iclk);
2328 if (ret)
2329 goto clk_en_err;
2330
2331 if (mmc_host_enable(host->mmc) != 0) {
2332 clk_disable(host->iclk);
2333 goto clk_en_err;
2334 }
2335
2336 if (host->got_dbclk)
2337 clk_enable(host->dbclk);
2338
2339 omap_hsmmc_conf_bus_power(host);
2340
2341 if (host->pdata->resume) {
2342 ret = host->pdata->resume(&pdev->dev, host->slot_id);
2343 if (ret)
2344 dev_dbg(mmc_dev(host->mmc),
2345 "Unmask interrupt failed\n");
2346 }
2347
2348 omap_hsmmc_protect_card(host);
2349
2350 /* Notify the core to resume the host */
2351 ret = mmc_resume_host(host->mmc);
2352 if (ret == 0)
2353 host->suspended = 0;
2354
2355 mmc_host_lazy_disable(host->mmc);
2356 }
2357
2358 return ret;
2359
2360 clk_en_err:
2361 dev_dbg(mmc_dev(host->mmc),
2362 "Failed to enable MMC clocks during resume\n");
2363 return ret;
2364 }
2365
2366 #else
2367 #define omap_hsmmc_suspend NULL
2368 #define omap_hsmmc_resume NULL
2369 #endif
2370
2371 static struct platform_driver omap_hsmmc_driver = {
2372 .remove = omap_hsmmc_remove,
2373 .suspend = omap_hsmmc_suspend,
2374 .resume = omap_hsmmc_resume,
2375 .driver = {
2376 .name = DRIVER_NAME,
2377 .owner = THIS_MODULE,
2378 },
2379 };
2380
2381 static int __init omap_hsmmc_init(void)
2382 {
2383 /* Register the MMC driver */
2384 return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe);
2385 }
2386
2387 static void __exit omap_hsmmc_cleanup(void)
2388 {
2389 /* Unregister MMC driver */
2390 platform_driver_unregister(&omap_hsmmc_driver);
2391 }
2392
2393 module_init(omap_hsmmc_init);
2394 module_exit(omap_hsmmc_cleanup);
2395
2396 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2397 MODULE_LICENSE("GPL");
2398 MODULE_ALIAS("platform:" DRIVER_NAME);
2399 MODULE_AUTHOR("Texas Instruments Inc");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree