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Merge branch 'message-callback' into kbuild/kconfig
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / host / omap_hsmmc.c
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/mmc/mmc.h>
32 #include <linux/io.h>
33 #include <linux/semaphore.h>
34 #include <linux/gpio.h>
35 #include <linux/regulator/consumer.h>
36 #include <plat/dma.h>
37 #include <mach/hardware.h>
38 #include <plat/board.h>
39 #include <plat/mmc.h>
40 #include <plat/cpu.h>
41
42 /* OMAP HSMMC Host Controller Registers */
43 #define OMAP_HSMMC_SYSCONFIG 0x0010
44 #define OMAP_HSMMC_SYSSTATUS 0x0014
45 #define OMAP_HSMMC_CON 0x002C
46 #define OMAP_HSMMC_BLK 0x0104
47 #define OMAP_HSMMC_ARG 0x0108
48 #define OMAP_HSMMC_CMD 0x010C
49 #define OMAP_HSMMC_RSP10 0x0110
50 #define OMAP_HSMMC_RSP32 0x0114
51 #define OMAP_HSMMC_RSP54 0x0118
52 #define OMAP_HSMMC_RSP76 0x011C
53 #define OMAP_HSMMC_DATA 0x0120
54 #define OMAP_HSMMC_HCTL 0x0128
55 #define OMAP_HSMMC_SYSCTL 0x012C
56 #define OMAP_HSMMC_STAT 0x0130
57 #define OMAP_HSMMC_IE 0x0134
58 #define OMAP_HSMMC_ISE 0x0138
59 #define OMAP_HSMMC_CAPA 0x0140
60
61 #define VS18 (1 << 26)
62 #define VS30 (1 << 25)
63 #define SDVS18 (0x5 << 9)
64 #define SDVS30 (0x6 << 9)
65 #define SDVS33 (0x7 << 9)
66 #define SDVS_MASK 0x00000E00
67 #define SDVSCLR 0xFFFFF1FF
68 #define SDVSDET 0x00000400
69 #define AUTOIDLE 0x1
70 #define SDBP (1 << 8)
71 #define DTO 0xe
72 #define ICE 0x1
73 #define ICS 0x2
74 #define CEN (1 << 2)
75 #define CLKD_MASK 0x0000FFC0
76 #define CLKD_SHIFT 6
77 #define DTO_MASK 0x000F0000
78 #define DTO_SHIFT 16
79 #define INT_EN_MASK 0x307F0033
80 #define BWR_ENABLE (1 << 4)
81 #define BRR_ENABLE (1 << 5)
82 #define DTO_ENABLE (1 << 20)
83 #define INIT_STREAM (1 << 1)
84 #define DP_SELECT (1 << 21)
85 #define DDIR (1 << 4)
86 #define DMA_EN 0x1
87 #define MSBS (1 << 5)
88 #define BCE (1 << 1)
89 #define FOUR_BIT (1 << 1)
90 #define DW8 (1 << 5)
91 #define CC 0x1
92 #define TC 0x02
93 #define OD 0x1
94 #define ERR (1 << 15)
95 #define CMD_TIMEOUT (1 << 16)
96 #define DATA_TIMEOUT (1 << 20)
97 #define CMD_CRC (1 << 17)
98 #define DATA_CRC (1 << 21)
99 #define CARD_ERR (1 << 28)
100 #define STAT_CLEAR 0xFFFFFFFF
101 #define INIT_STREAM_CMD 0x00000000
102 #define DUAL_VOLT_OCR_BIT 7
103 #define SRC (1 << 25)
104 #define SRD (1 << 26)
105 #define SOFTRESET (1 << 1)
106 #define RESETDONE (1 << 0)
107
108 /*
109 * FIXME: Most likely all the data using these _DEVID defines should come
110 * from the platform_data, or implemented in controller and slot specific
111 * functions.
112 */
113 #define OMAP_MMC1_DEVID 0
114 #define OMAP_MMC2_DEVID 1
115 #define OMAP_MMC3_DEVID 2
116 #define OMAP_MMC4_DEVID 3
117 #define OMAP_MMC5_DEVID 4
118
119 #define MMC_TIMEOUT_MS 20
120 #define OMAP_MMC_MASTER_CLOCK 96000000
121 #define DRIVER_NAME "mmci-omap-hs"
122
123 /* Timeouts for entering power saving states on inactivity, msec */
124 #define OMAP_MMC_DISABLED_TIMEOUT 100
125 #define OMAP_MMC_SLEEP_TIMEOUT 1000
126 #define OMAP_MMC_OFF_TIMEOUT 8000
127
128 /*
129 * One controller can have multiple slots, like on some omap boards using
130 * omap.c controller driver. Luckily this is not currently done on any known
131 * omap_hsmmc.c device.
132 */
133 #define mmc_slot(host) (host->pdata->slots[host->slot_id])
134
135 /*
136 * MMC Host controller read/write API's
137 */
138 #define OMAP_HSMMC_READ(base, reg) \
139 __raw_readl((base) + OMAP_HSMMC_##reg)
140
141 #define OMAP_HSMMC_WRITE(base, reg, val) \
142 __raw_writel((val), (base) + OMAP_HSMMC_##reg)
143
144 struct omap_hsmmc_host {
145 struct device *dev;
146 struct mmc_host *mmc;
147 struct mmc_request *mrq;
148 struct mmc_command *cmd;
149 struct mmc_data *data;
150 struct clk *fclk;
151 struct clk *iclk;
152 struct clk *dbclk;
153 /*
154 * vcc == configured supply
155 * vcc_aux == optional
156 * - MMC1, supply for DAT4..DAT7
157 * - MMC2/MMC2, external level shifter voltage supply, for
158 * chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
159 */
160 struct regulator *vcc;
161 struct regulator *vcc_aux;
162 struct work_struct mmc_carddetect_work;
163 void __iomem *base;
164 resource_size_t mapbase;
165 spinlock_t irq_lock; /* Prevent races with irq handler */
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 int req_in_progress;
187
188 struct omap_mmc_platform_data *pdata;
189 };
190
191 static int omap_hsmmc_card_detect(struct device *dev, int slot)
192 {
193 struct omap_mmc_platform_data *mmc = dev->platform_data;
194
195 /* NOTE: assumes card detect signal is active-low */
196 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
197 }
198
199 static int omap_hsmmc_get_wp(struct device *dev, int slot)
200 {
201 struct omap_mmc_platform_data *mmc = dev->platform_data;
202
203 /* NOTE: assumes write protect signal is active-high */
204 return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
205 }
206
207 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
208 {
209 struct omap_mmc_platform_data *mmc = dev->platform_data;
210
211 /* NOTE: assumes card detect signal is active-low */
212 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
213 }
214
215 #ifdef CONFIG_PM
216
217 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
218 {
219 struct omap_mmc_platform_data *mmc = dev->platform_data;
220
221 disable_irq(mmc->slots[0].card_detect_irq);
222 return 0;
223 }
224
225 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
226 {
227 struct omap_mmc_platform_data *mmc = dev->platform_data;
228
229 enable_irq(mmc->slots[0].card_detect_irq);
230 return 0;
231 }
232
233 #else
234
235 #define omap_hsmmc_suspend_cdirq NULL
236 #define omap_hsmmc_resume_cdirq NULL
237
238 #endif
239
240 #ifdef CONFIG_REGULATOR
241
242 static int omap_hsmmc_1_set_power(struct device *dev, int slot, int power_on,
243 int vdd)
244 {
245 struct omap_hsmmc_host *host =
246 platform_get_drvdata(to_platform_device(dev));
247 int ret;
248
249 if (mmc_slot(host).before_set_reg)
250 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
251
252 if (power_on)
253 ret = mmc_regulator_set_ocr(host->vcc, vdd);
254 else
255 ret = mmc_regulator_set_ocr(host->vcc, 0);
256
257 if (mmc_slot(host).after_set_reg)
258 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
259
260 return ret;
261 }
262
263 static int omap_hsmmc_23_set_power(struct device *dev, int slot, int power_on,
264 int vdd)
265 {
266 struct omap_hsmmc_host *host =
267 platform_get_drvdata(to_platform_device(dev));
268 int ret = 0;
269
270 /*
271 * If we don't see a Vcc regulator, assume it's a fixed
272 * voltage always-on regulator.
273 */
274 if (!host->vcc)
275 return 0;
276
277 if (mmc_slot(host).before_set_reg)
278 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
279
280 /*
281 * Assume Vcc regulator is used only to power the card ... OMAP
282 * VDDS is used to power the pins, optionally with a transceiver to
283 * support cards using voltages other than VDDS (1.8V nominal). When a
284 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
285 *
286 * In some cases this regulator won't support enable/disable;
287 * e.g. it's a fixed rail for a WLAN chip.
288 *
289 * In other cases vcc_aux switches interface power. Example, for
290 * eMMC cards it represents VccQ. Sometimes transceivers or SDIO
291 * chips/cards need an interface voltage rail too.
292 */
293 if (power_on) {
294 ret = mmc_regulator_set_ocr(host->vcc, vdd);
295 /* Enable interface voltage rail, if needed */
296 if (ret == 0 && host->vcc_aux) {
297 ret = regulator_enable(host->vcc_aux);
298 if (ret < 0)
299 ret = mmc_regulator_set_ocr(host->vcc, 0);
300 }
301 } else {
302 if (host->vcc_aux)
303 ret = regulator_disable(host->vcc_aux);
304 if (ret == 0)
305 ret = mmc_regulator_set_ocr(host->vcc, 0);
306 }
307
308 if (mmc_slot(host).after_set_reg)
309 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
310
311 return ret;
312 }
313
314 static int omap_hsmmc_1_set_sleep(struct device *dev, int slot, int sleep,
315 int vdd, int cardsleep)
316 {
317 struct omap_hsmmc_host *host =
318 platform_get_drvdata(to_platform_device(dev));
319 int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
320
321 return regulator_set_mode(host->vcc, mode);
322 }
323
324 static int omap_hsmmc_23_set_sleep(struct device *dev, int slot, int sleep,
325 int vdd, int cardsleep)
326 {
327 struct omap_hsmmc_host *host =
328 platform_get_drvdata(to_platform_device(dev));
329 int err, mode;
330
331 /*
332 * If we don't see a Vcc regulator, assume it's a fixed
333 * voltage always-on regulator.
334 */
335 if (!host->vcc)
336 return 0;
337
338 mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
339
340 if (!host->vcc_aux)
341 return regulator_set_mode(host->vcc, mode);
342
343 if (cardsleep) {
344 /* VCC can be turned off if card is asleep */
345 if (sleep)
346 err = mmc_regulator_set_ocr(host->vcc, 0);
347 else
348 err = mmc_regulator_set_ocr(host->vcc, vdd);
349 } else
350 err = regulator_set_mode(host->vcc, mode);
351 if (err)
352 return err;
353
354 if (!mmc_slot(host).vcc_aux_disable_is_sleep)
355 return regulator_set_mode(host->vcc_aux, mode);
356
357 if (sleep)
358 return regulator_disable(host->vcc_aux);
359 else
360 return regulator_enable(host->vcc_aux);
361 }
362
363 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
364 {
365 struct regulator *reg;
366 int ret = 0;
367
368 switch (host->id) {
369 case OMAP_MMC1_DEVID:
370 /* On-chip level shifting via PBIAS0/PBIAS1 */
371 mmc_slot(host).set_power = omap_hsmmc_1_set_power;
372 mmc_slot(host).set_sleep = omap_hsmmc_1_set_sleep;
373 break;
374 case OMAP_MMC2_DEVID:
375 case OMAP_MMC3_DEVID:
376 /* Off-chip level shifting, or none */
377 mmc_slot(host).set_power = omap_hsmmc_23_set_power;
378 mmc_slot(host).set_sleep = omap_hsmmc_23_set_sleep;
379 break;
380 default:
381 pr_err("MMC%d configuration not supported!\n", host->id);
382 return -EINVAL;
383 }
384
385 reg = regulator_get(host->dev, "vmmc");
386 if (IS_ERR(reg)) {
387 dev_dbg(host->dev, "vmmc regulator missing\n");
388 /*
389 * HACK: until fixed.c regulator is usable,
390 * we don't require a main regulator
391 * for MMC2 or MMC3
392 */
393 if (host->id == OMAP_MMC1_DEVID) {
394 ret = PTR_ERR(reg);
395 goto err;
396 }
397 } else {
398 host->vcc = reg;
399 mmc_slot(host).ocr_mask = mmc_regulator_get_ocrmask(reg);
400
401 /* Allow an aux regulator */
402 reg = regulator_get(host->dev, "vmmc_aux");
403 host->vcc_aux = IS_ERR(reg) ? NULL : reg;
404
405 /*
406 * UGLY HACK: workaround regulator framework bugs.
407 * When the bootloader leaves a supply active, it's
408 * initialized with zero usecount ... and we can't
409 * disable it without first enabling it. Until the
410 * framework is fixed, we need a workaround like this
411 * (which is safe for MMC, but not in general).
412 */
413 if (regulator_is_enabled(host->vcc) > 0) {
414 regulator_enable(host->vcc);
415 regulator_disable(host->vcc);
416 }
417 if (host->vcc_aux) {
418 if (regulator_is_enabled(reg) > 0) {
419 regulator_enable(reg);
420 regulator_disable(reg);
421 }
422 }
423 }
424
425 return 0;
426
427 err:
428 mmc_slot(host).set_power = NULL;
429 mmc_slot(host).set_sleep = NULL;
430 return ret;
431 }
432
433 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
434 {
435 regulator_put(host->vcc);
436 regulator_put(host->vcc_aux);
437 mmc_slot(host).set_power = NULL;
438 mmc_slot(host).set_sleep = NULL;
439 }
440
441 static inline int omap_hsmmc_have_reg(void)
442 {
443 return 1;
444 }
445
446 #else
447
448 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
449 {
450 return -EINVAL;
451 }
452
453 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
454 {
455 }
456
457 static inline int omap_hsmmc_have_reg(void)
458 {
459 return 0;
460 }
461
462 #endif
463
464 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
465 {
466 int ret;
467
468 if (gpio_is_valid(pdata->slots[0].switch_pin)) {
469 pdata->suspend = omap_hsmmc_suspend_cdirq;
470 pdata->resume = omap_hsmmc_resume_cdirq;
471 if (pdata->slots[0].cover)
472 pdata->slots[0].get_cover_state =
473 omap_hsmmc_get_cover_state;
474 else
475 pdata->slots[0].card_detect = omap_hsmmc_card_detect;
476 pdata->slots[0].card_detect_irq =
477 gpio_to_irq(pdata->slots[0].switch_pin);
478 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
479 if (ret)
480 return ret;
481 ret = gpio_direction_input(pdata->slots[0].switch_pin);
482 if (ret)
483 goto err_free_sp;
484 } else
485 pdata->slots[0].switch_pin = -EINVAL;
486
487 if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
488 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
489 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
490 if (ret)
491 goto err_free_cd;
492 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
493 if (ret)
494 goto err_free_wp;
495 } else
496 pdata->slots[0].gpio_wp = -EINVAL;
497
498 return 0;
499
500 err_free_wp:
501 gpio_free(pdata->slots[0].gpio_wp);
502 err_free_cd:
503 if (gpio_is_valid(pdata->slots[0].switch_pin))
504 err_free_sp:
505 gpio_free(pdata->slots[0].switch_pin);
506 return ret;
507 }
508
509 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
510 {
511 if (gpio_is_valid(pdata->slots[0].gpio_wp))
512 gpio_free(pdata->slots[0].gpio_wp);
513 if (gpio_is_valid(pdata->slots[0].switch_pin))
514 gpio_free(pdata->slots[0].switch_pin);
515 }
516
517 /*
518 * Stop clock to the card
519 */
520 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
521 {
522 OMAP_HSMMC_WRITE(host->base, SYSCTL,
523 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
524 if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
525 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
526 }
527
528 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
529 struct mmc_command *cmd)
530 {
531 unsigned int irq_mask;
532
533 if (host->use_dma)
534 irq_mask = INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE);
535 else
536 irq_mask = INT_EN_MASK;
537
538 /* Disable timeout for erases */
539 if (cmd->opcode == MMC_ERASE)
540 irq_mask &= ~DTO_ENABLE;
541
542 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
543 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
544 OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
545 }
546
547 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
548 {
549 OMAP_HSMMC_WRITE(host->base, ISE, 0);
550 OMAP_HSMMC_WRITE(host->base, IE, 0);
551 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
552 }
553
554 #ifdef CONFIG_PM
555
556 /*
557 * Restore the MMC host context, if it was lost as result of a
558 * power state change.
559 */
560 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
561 {
562 struct mmc_ios *ios = &host->mmc->ios;
563 struct omap_mmc_platform_data *pdata = host->pdata;
564 int context_loss = 0;
565 u32 hctl, capa, con;
566 u16 dsor = 0;
567 unsigned long timeout;
568
569 if (pdata->get_context_loss_count) {
570 context_loss = pdata->get_context_loss_count(host->dev);
571 if (context_loss < 0)
572 return 1;
573 }
574
575 dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
576 context_loss == host->context_loss ? "not " : "");
577 if (host->context_loss == context_loss)
578 return 1;
579
580 /* Wait for hardware reset */
581 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
582 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
583 && time_before(jiffies, timeout))
584 ;
585
586 /* Do software reset */
587 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
588 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
589 while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
590 && time_before(jiffies, timeout))
591 ;
592
593 OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
594 OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
595
596 if (host->id == OMAP_MMC1_DEVID) {
597 if (host->power_mode != MMC_POWER_OFF &&
598 (1 << ios->vdd) <= MMC_VDD_23_24)
599 hctl = SDVS18;
600 else
601 hctl = SDVS30;
602 capa = VS30 | VS18;
603 } else {
604 hctl = SDVS18;
605 capa = VS18;
606 }
607
608 OMAP_HSMMC_WRITE(host->base, HCTL,
609 OMAP_HSMMC_READ(host->base, HCTL) | hctl);
610
611 OMAP_HSMMC_WRITE(host->base, CAPA,
612 OMAP_HSMMC_READ(host->base, CAPA) | capa);
613
614 OMAP_HSMMC_WRITE(host->base, HCTL,
615 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
616
617 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
618 while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
619 && time_before(jiffies, timeout))
620 ;
621
622 omap_hsmmc_disable_irq(host);
623
624 /* Do not initialize card-specific things if the power is off */
625 if (host->power_mode == MMC_POWER_OFF)
626 goto out;
627
628 con = OMAP_HSMMC_READ(host->base, CON);
629 switch (ios->bus_width) {
630 case MMC_BUS_WIDTH_8:
631 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
632 break;
633 case MMC_BUS_WIDTH_4:
634 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
635 OMAP_HSMMC_WRITE(host->base, HCTL,
636 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
637 break;
638 case MMC_BUS_WIDTH_1:
639 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
640 OMAP_HSMMC_WRITE(host->base, HCTL,
641 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
642 break;
643 }
644
645 if (ios->clock) {
646 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
647 if (dsor < 1)
648 dsor = 1;
649
650 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
651 dsor++;
652
653 if (dsor > 250)
654 dsor = 250;
655 }
656
657 OMAP_HSMMC_WRITE(host->base, SYSCTL,
658 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
659 OMAP_HSMMC_WRITE(host->base, SYSCTL, (dsor << 6) | (DTO << 16));
660 OMAP_HSMMC_WRITE(host->base, SYSCTL,
661 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
662
663 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
664 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
665 && time_before(jiffies, timeout))
666 ;
667
668 OMAP_HSMMC_WRITE(host->base, SYSCTL,
669 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
670
671 con = OMAP_HSMMC_READ(host->base, CON);
672 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
673 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
674 else
675 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
676 out:
677 host->context_loss = context_loss;
678
679 dev_dbg(mmc_dev(host->mmc), "context is restored\n");
680 return 0;
681 }
682
683 /*
684 * Save the MMC host context (store the number of power state changes so far).
685 */
686 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
687 {
688 struct omap_mmc_platform_data *pdata = host->pdata;
689 int context_loss;
690
691 if (pdata->get_context_loss_count) {
692 context_loss = pdata->get_context_loss_count(host->dev);
693 if (context_loss < 0)
694 return;
695 host->context_loss = context_loss;
696 }
697 }
698
699 #else
700
701 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
702 {
703 return 0;
704 }
705
706 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
707 {
708 }
709
710 #endif
711
712 /*
713 * Send init stream sequence to card
714 * before sending IDLE command
715 */
716 static void send_init_stream(struct omap_hsmmc_host *host)
717 {
718 int reg = 0;
719 unsigned long timeout;
720
721 if (host->protect_card)
722 return;
723
724 disable_irq(host->irq);
725
726 OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
727 OMAP_HSMMC_WRITE(host->base, CON,
728 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
729 OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
730
731 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
732 while ((reg != CC) && time_before(jiffies, timeout))
733 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
734
735 OMAP_HSMMC_WRITE(host->base, CON,
736 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
737
738 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
739 OMAP_HSMMC_READ(host->base, STAT);
740
741 enable_irq(host->irq);
742 }
743
744 static inline
745 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
746 {
747 int r = 1;
748
749 if (mmc_slot(host).get_cover_state)
750 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
751 return r;
752 }
753
754 static ssize_t
755 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
756 char *buf)
757 {
758 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
759 struct omap_hsmmc_host *host = mmc_priv(mmc);
760
761 return sprintf(buf, "%s\n",
762 omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
763 }
764
765 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
766
767 static ssize_t
768 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
769 char *buf)
770 {
771 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
772 struct omap_hsmmc_host *host = mmc_priv(mmc);
773
774 return sprintf(buf, "%s\n", mmc_slot(host).name);
775 }
776
777 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
778
779 /*
780 * Configure the response type and send the cmd.
781 */
782 static void
783 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
784 struct mmc_data *data)
785 {
786 int cmdreg = 0, resptype = 0, cmdtype = 0;
787
788 dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
789 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
790 host->cmd = cmd;
791
792 omap_hsmmc_enable_irq(host, cmd);
793
794 host->response_busy = 0;
795 if (cmd->flags & MMC_RSP_PRESENT) {
796 if (cmd->flags & MMC_RSP_136)
797 resptype = 1;
798 else if (cmd->flags & MMC_RSP_BUSY) {
799 resptype = 3;
800 host->response_busy = 1;
801 } else
802 resptype = 2;
803 }
804
805 /*
806 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
807 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
808 * a val of 0x3, rest 0x0.
809 */
810 if (cmd == host->mrq->stop)
811 cmdtype = 0x3;
812
813 cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
814
815 if (data) {
816 cmdreg |= DP_SELECT | MSBS | BCE;
817 if (data->flags & MMC_DATA_READ)
818 cmdreg |= DDIR;
819 else
820 cmdreg &= ~(DDIR);
821 }
822
823 if (host->use_dma)
824 cmdreg |= DMA_EN;
825
826 host->req_in_progress = 1;
827
828 OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
829 OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
830 }
831
832 static int
833 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
834 {
835 if (data->flags & MMC_DATA_WRITE)
836 return DMA_TO_DEVICE;
837 else
838 return DMA_FROM_DEVICE;
839 }
840
841 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
842 {
843 int dma_ch;
844
845 spin_lock(&host->irq_lock);
846 host->req_in_progress = 0;
847 dma_ch = host->dma_ch;
848 spin_unlock(&host->irq_lock);
849
850 omap_hsmmc_disable_irq(host);
851 /* Do not complete the request if DMA is still in progress */
852 if (mrq->data && host->use_dma && dma_ch != -1)
853 return;
854 host->mrq = NULL;
855 mmc_request_done(host->mmc, mrq);
856 }
857
858 /*
859 * Notify the transfer complete to MMC core
860 */
861 static void
862 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
863 {
864 if (!data) {
865 struct mmc_request *mrq = host->mrq;
866
867 /* TC before CC from CMD6 - don't know why, but it happens */
868 if (host->cmd && host->cmd->opcode == 6 &&
869 host->response_busy) {
870 host->response_busy = 0;
871 return;
872 }
873
874 omap_hsmmc_request_done(host, mrq);
875 return;
876 }
877
878 host->data = NULL;
879
880 if (!data->error)
881 data->bytes_xfered += data->blocks * (data->blksz);
882 else
883 data->bytes_xfered = 0;
884
885 if (!data->stop) {
886 omap_hsmmc_request_done(host, data->mrq);
887 return;
888 }
889 omap_hsmmc_start_command(host, data->stop, NULL);
890 }
891
892 /*
893 * Notify the core about command completion
894 */
895 static void
896 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
897 {
898 host->cmd = NULL;
899
900 if (cmd->flags & MMC_RSP_PRESENT) {
901 if (cmd->flags & MMC_RSP_136) {
902 /* response type 2 */
903 cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
904 cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
905 cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
906 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
907 } else {
908 /* response types 1, 1b, 3, 4, 5, 6 */
909 cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
910 }
911 }
912 if ((host->data == NULL && !host->response_busy) || cmd->error)
913 omap_hsmmc_request_done(host, cmd->mrq);
914 }
915
916 /*
917 * DMA clean up for command errors
918 */
919 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
920 {
921 int dma_ch;
922
923 host->data->error = errno;
924
925 spin_lock(&host->irq_lock);
926 dma_ch = host->dma_ch;
927 host->dma_ch = -1;
928 spin_unlock(&host->irq_lock);
929
930 if (host->use_dma && dma_ch != -1) {
931 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
932 omap_hsmmc_get_dma_dir(host, host->data));
933 omap_free_dma(dma_ch);
934 }
935 host->data = NULL;
936 }
937
938 /*
939 * Readable error output
940 */
941 #ifdef CONFIG_MMC_DEBUG
942 static void omap_hsmmc_report_irq(struct omap_hsmmc_host *host, u32 status)
943 {
944 /* --- means reserved bit without definition at documentation */
945 static const char *omap_hsmmc_status_bits[] = {
946 "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ",
947 "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC",
948 "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---",
949 "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---"
950 };
951 char res[256];
952 char *buf = res;
953 int len, i;
954
955 len = sprintf(buf, "MMC IRQ 0x%x :", status);
956 buf += len;
957
958 for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
959 if (status & (1 << i)) {
960 len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
961 buf += len;
962 }
963
964 dev_dbg(mmc_dev(host->mmc), "%s\n", res);
965 }
966 #endif /* CONFIG_MMC_DEBUG */
967
968 /*
969 * MMC controller internal state machines reset
970 *
971 * Used to reset command or data internal state machines, using respectively
972 * SRC or SRD bit of SYSCTL register
973 * Can be called from interrupt context
974 */
975 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
976 unsigned long bit)
977 {
978 unsigned long i = 0;
979 unsigned long limit = (loops_per_jiffy *
980 msecs_to_jiffies(MMC_TIMEOUT_MS));
981
982 OMAP_HSMMC_WRITE(host->base, SYSCTL,
983 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
984
985 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
986 (i++ < limit))
987 cpu_relax();
988
989 if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
990 dev_err(mmc_dev(host->mmc),
991 "Timeout waiting on controller reset in %s\n",
992 __func__);
993 }
994
995 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
996 {
997 struct mmc_data *data;
998 int end_cmd = 0, end_trans = 0;
999
1000 if (!host->req_in_progress) {
1001 do {
1002 OMAP_HSMMC_WRITE(host->base, STAT, status);
1003 /* Flush posted write */
1004 status = OMAP_HSMMC_READ(host->base, STAT);
1005 } while (status & INT_EN_MASK);
1006 return;
1007 }
1008
1009 data = host->data;
1010 dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1011
1012 if (status & ERR) {
1013 #ifdef CONFIG_MMC_DEBUG
1014 omap_hsmmc_report_irq(host, status);
1015 #endif
1016 if ((status & CMD_TIMEOUT) ||
1017 (status & CMD_CRC)) {
1018 if (host->cmd) {
1019 if (status & CMD_TIMEOUT) {
1020 omap_hsmmc_reset_controller_fsm(host,
1021 SRC);
1022 host->cmd->error = -ETIMEDOUT;
1023 } else {
1024 host->cmd->error = -EILSEQ;
1025 }
1026 end_cmd = 1;
1027 }
1028 if (host->data || host->response_busy) {
1029 if (host->data)
1030 omap_hsmmc_dma_cleanup(host,
1031 -ETIMEDOUT);
1032 host->response_busy = 0;
1033 omap_hsmmc_reset_controller_fsm(host, SRD);
1034 }
1035 }
1036 if ((status & DATA_TIMEOUT) ||
1037 (status & DATA_CRC)) {
1038 if (host->data || host->response_busy) {
1039 int err = (status & DATA_TIMEOUT) ?
1040 -ETIMEDOUT : -EILSEQ;
1041
1042 if (host->data)
1043 omap_hsmmc_dma_cleanup(host, err);
1044 else
1045 host->mrq->cmd->error = err;
1046 host->response_busy = 0;
1047 omap_hsmmc_reset_controller_fsm(host, SRD);
1048 end_trans = 1;
1049 }
1050 }
1051 if (status & CARD_ERR) {
1052 dev_dbg(mmc_dev(host->mmc),
1053 "Ignoring card err CMD%d\n", host->cmd->opcode);
1054 if (host->cmd)
1055 end_cmd = 1;
1056 if (host->data)
1057 end_trans = 1;
1058 }
1059 }
1060
1061 OMAP_HSMMC_WRITE(host->base, STAT, status);
1062
1063 if (end_cmd || ((status & CC) && host->cmd))
1064 omap_hsmmc_cmd_done(host, host->cmd);
1065 if ((end_trans || (status & TC)) && host->mrq)
1066 omap_hsmmc_xfer_done(host, data);
1067 }
1068
1069 /*
1070 * MMC controller IRQ handler
1071 */
1072 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1073 {
1074 struct omap_hsmmc_host *host = dev_id;
1075 int status;
1076
1077 status = OMAP_HSMMC_READ(host->base, STAT);
1078 do {
1079 omap_hsmmc_do_irq(host, status);
1080 /* Flush posted write */
1081 status = OMAP_HSMMC_READ(host->base, STAT);
1082 } while (status & INT_EN_MASK);
1083
1084 return IRQ_HANDLED;
1085 }
1086
1087 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1088 {
1089 unsigned long i;
1090
1091 OMAP_HSMMC_WRITE(host->base, HCTL,
1092 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1093 for (i = 0; i < loops_per_jiffy; i++) {
1094 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1095 break;
1096 cpu_relax();
1097 }
1098 }
1099
1100 /*
1101 * Switch MMC interface voltage ... only relevant for MMC1.
1102 *
1103 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1104 * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1105 * Some chips, like eMMC ones, use internal transceivers.
1106 */
1107 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1108 {
1109 u32 reg_val = 0;
1110 int ret;
1111
1112 /* Disable the clocks */
1113 clk_disable(host->fclk);
1114 clk_disable(host->iclk);
1115 if (host->got_dbclk)
1116 clk_disable(host->dbclk);
1117
1118 /* Turn the power off */
1119 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1120
1121 /* Turn the power ON with given VDD 1.8 or 3.0v */
1122 if (!ret)
1123 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1124 vdd);
1125 clk_enable(host->iclk);
1126 clk_enable(host->fclk);
1127 if (host->got_dbclk)
1128 clk_enable(host->dbclk);
1129
1130 if (ret != 0)
1131 goto err;
1132
1133 OMAP_HSMMC_WRITE(host->base, HCTL,
1134 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1135 reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1136
1137 /*
1138 * If a MMC dual voltage card is detected, the set_ios fn calls
1139 * this fn with VDD bit set for 1.8V. Upon card removal from the
1140 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1141 *
1142 * Cope with a bit of slop in the range ... per data sheets:
1143 * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1144 * but recommended values are 1.71V to 1.89V
1145 * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1146 * but recommended values are 2.7V to 3.3V
1147 *
1148 * Board setup code shouldn't permit anything very out-of-range.
1149 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1150 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1151 */
1152 if ((1 << vdd) <= MMC_VDD_23_24)
1153 reg_val |= SDVS18;
1154 else
1155 reg_val |= SDVS30;
1156
1157 OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1158 set_sd_bus_power(host);
1159
1160 return 0;
1161 err:
1162 dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1163 return ret;
1164 }
1165
1166 /* Protect the card while the cover is open */
1167 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1168 {
1169 if (!mmc_slot(host).get_cover_state)
1170 return;
1171
1172 host->reqs_blocked = 0;
1173 if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1174 if (host->protect_card) {
1175 printk(KERN_INFO "%s: cover is closed, "
1176 "card is now accessible\n",
1177 mmc_hostname(host->mmc));
1178 host->protect_card = 0;
1179 }
1180 } else {
1181 if (!host->protect_card) {
1182 printk(KERN_INFO "%s: cover is open, "
1183 "card is now inaccessible\n",
1184 mmc_hostname(host->mmc));
1185 host->protect_card = 1;
1186 }
1187 }
1188 }
1189
1190 /*
1191 * Work Item to notify the core about card insertion/removal
1192 */
1193 static void omap_hsmmc_detect(struct work_struct *work)
1194 {
1195 struct omap_hsmmc_host *host =
1196 container_of(work, struct omap_hsmmc_host, mmc_carddetect_work);
1197 struct omap_mmc_slot_data *slot = &mmc_slot(host);
1198 int carddetect;
1199
1200 if (host->suspended)
1201 return;
1202
1203 sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1204
1205 if (slot->card_detect)
1206 carddetect = slot->card_detect(host->dev, host->slot_id);
1207 else {
1208 omap_hsmmc_protect_card(host);
1209 carddetect = -ENOSYS;
1210 }
1211
1212 if (carddetect)
1213 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1214 else
1215 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1216 }
1217
1218 /*
1219 * ISR for handling card insertion and removal
1220 */
1221 static irqreturn_t omap_hsmmc_cd_handler(int irq, void *dev_id)
1222 {
1223 struct omap_hsmmc_host *host = (struct omap_hsmmc_host *)dev_id;
1224
1225 if (host->suspended)
1226 return IRQ_HANDLED;
1227 schedule_work(&host->mmc_carddetect_work);
1228
1229 return IRQ_HANDLED;
1230 }
1231
1232 static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
1233 struct mmc_data *data)
1234 {
1235 int sync_dev;
1236
1237 if (data->flags & MMC_DATA_WRITE)
1238 sync_dev = host->dma_line_tx;
1239 else
1240 sync_dev = host->dma_line_rx;
1241 return sync_dev;
1242 }
1243
1244 static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
1245 struct mmc_data *data,
1246 struct scatterlist *sgl)
1247 {
1248 int blksz, nblk, dma_ch;
1249
1250 dma_ch = host->dma_ch;
1251 if (data->flags & MMC_DATA_WRITE) {
1252 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1253 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1254 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1255 sg_dma_address(sgl), 0, 0);
1256 } else {
1257 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1258 (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1259 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1260 sg_dma_address(sgl), 0, 0);
1261 }
1262
1263 blksz = host->data->blksz;
1264 nblk = sg_dma_len(sgl) / blksz;
1265
1266 omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
1267 blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
1268 omap_hsmmc_get_dma_sync_dev(host, data),
1269 !(data->flags & MMC_DATA_WRITE));
1270
1271 omap_start_dma(dma_ch);
1272 }
1273
1274 /*
1275 * DMA call back function
1276 */
1277 static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data)
1278 {
1279 struct omap_hsmmc_host *host = cb_data;
1280 struct mmc_data *data = host->mrq->data;
1281 int dma_ch, req_in_progress;
1282
1283 if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
1284 dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n",
1285 ch_status);
1286 return;
1287 }
1288
1289 spin_lock(&host->irq_lock);
1290 if (host->dma_ch < 0) {
1291 spin_unlock(&host->irq_lock);
1292 return;
1293 }
1294
1295 host->dma_sg_idx++;
1296 if (host->dma_sg_idx < host->dma_len) {
1297 /* Fire up the next transfer. */
1298 omap_hsmmc_config_dma_params(host, data,
1299 data->sg + host->dma_sg_idx);
1300 spin_unlock(&host->irq_lock);
1301 return;
1302 }
1303
1304 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
1305 omap_hsmmc_get_dma_dir(host, data));
1306
1307 req_in_progress = host->req_in_progress;
1308 dma_ch = host->dma_ch;
1309 host->dma_ch = -1;
1310 spin_unlock(&host->irq_lock);
1311
1312 omap_free_dma(dma_ch);
1313
1314 /* If DMA has finished after TC, complete the request */
1315 if (!req_in_progress) {
1316 struct mmc_request *mrq = host->mrq;
1317
1318 host->mrq = NULL;
1319 mmc_request_done(host->mmc, mrq);
1320 }
1321 }
1322
1323 /*
1324 * Routine to configure and start DMA for the MMC card
1325 */
1326 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1327 struct mmc_request *req)
1328 {
1329 int dma_ch = 0, ret = 0, i;
1330 struct mmc_data *data = req->data;
1331
1332 /* Sanity check: all the SG entries must be aligned by block size. */
1333 for (i = 0; i < data->sg_len; i++) {
1334 struct scatterlist *sgl;
1335
1336 sgl = data->sg + i;
1337 if (sgl->length % data->blksz)
1338 return -EINVAL;
1339 }
1340 if ((data->blksz % 4) != 0)
1341 /* REVISIT: The MMC buffer increments only when MSB is written.
1342 * Return error for blksz which is non multiple of four.
1343 */
1344 return -EINVAL;
1345
1346 BUG_ON(host->dma_ch != -1);
1347
1348 ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
1349 "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
1350 if (ret != 0) {
1351 dev_err(mmc_dev(host->mmc),
1352 "%s: omap_request_dma() failed with %d\n",
1353 mmc_hostname(host->mmc), ret);
1354 return ret;
1355 }
1356
1357 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1358 data->sg_len, omap_hsmmc_get_dma_dir(host, data));
1359 host->dma_ch = dma_ch;
1360 host->dma_sg_idx = 0;
1361
1362 omap_hsmmc_config_dma_params(host, data, data->sg);
1363
1364 return 0;
1365 }
1366
1367 static void set_data_timeout(struct omap_hsmmc_host *host,
1368 unsigned int timeout_ns,
1369 unsigned int timeout_clks)
1370 {
1371 unsigned int timeout, cycle_ns;
1372 uint32_t reg, clkd, dto = 0;
1373
1374 reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1375 clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1376 if (clkd == 0)
1377 clkd = 1;
1378
1379 cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1380 timeout = timeout_ns / cycle_ns;
1381 timeout += timeout_clks;
1382 if (timeout) {
1383 while ((timeout & 0x80000000) == 0) {
1384 dto += 1;
1385 timeout <<= 1;
1386 }
1387 dto = 31 - dto;
1388 timeout <<= 1;
1389 if (timeout && dto)
1390 dto += 1;
1391 if (dto >= 13)
1392 dto -= 13;
1393 else
1394 dto = 0;
1395 if (dto > 14)
1396 dto = 14;
1397 }
1398
1399 reg &= ~DTO_MASK;
1400 reg |= dto << DTO_SHIFT;
1401 OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1402 }
1403
1404 /*
1405 * Configure block length for MMC/SD cards and initiate the transfer.
1406 */
1407 static int
1408 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1409 {
1410 int ret;
1411 host->data = req->data;
1412
1413 if (req->data == NULL) {
1414 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1415 /*
1416 * Set an arbitrary 100ms data timeout for commands with
1417 * busy signal.
1418 */
1419 if (req->cmd->flags & MMC_RSP_BUSY)
1420 set_data_timeout(host, 100000000U, 0);
1421 return 0;
1422 }
1423
1424 OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1425 | (req->data->blocks << 16));
1426 set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1427
1428 if (host->use_dma) {
1429 ret = omap_hsmmc_start_dma_transfer(host, req);
1430 if (ret != 0) {
1431 dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1432 return ret;
1433 }
1434 }
1435 return 0;
1436 }
1437
1438 /*
1439 * Request function. for read/write operation
1440 */
1441 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1442 {
1443 struct omap_hsmmc_host *host = mmc_priv(mmc);
1444 int err;
1445
1446 BUG_ON(host->req_in_progress);
1447 BUG_ON(host->dma_ch != -1);
1448 if (host->protect_card) {
1449 if (host->reqs_blocked < 3) {
1450 /*
1451 * Ensure the controller is left in a consistent
1452 * state by resetting the command and data state
1453 * machines.
1454 */
1455 omap_hsmmc_reset_controller_fsm(host, SRD);
1456 omap_hsmmc_reset_controller_fsm(host, SRC);
1457 host->reqs_blocked += 1;
1458 }
1459 req->cmd->error = -EBADF;
1460 if (req->data)
1461 req->data->error = -EBADF;
1462 req->cmd->retries = 0;
1463 mmc_request_done(mmc, req);
1464 return;
1465 } else if (host->reqs_blocked)
1466 host->reqs_blocked = 0;
1467 WARN_ON(host->mrq != NULL);
1468 host->mrq = req;
1469 err = omap_hsmmc_prepare_data(host, req);
1470 if (err) {
1471 req->cmd->error = err;
1472 if (req->data)
1473 req->data->error = err;
1474 host->mrq = NULL;
1475 mmc_request_done(mmc, req);
1476 return;
1477 }
1478
1479 omap_hsmmc_start_command(host, req->cmd, req->data);
1480 }
1481
1482 /* Routine to configure clock values. Exposed API to core */
1483 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1484 {
1485 struct omap_hsmmc_host *host = mmc_priv(mmc);
1486 u16 dsor = 0;
1487 unsigned long regval;
1488 unsigned long timeout;
1489 u32 con;
1490 int do_send_init_stream = 0;
1491
1492 mmc_host_enable(host->mmc);
1493
1494 if (ios->power_mode != host->power_mode) {
1495 switch (ios->power_mode) {
1496 case MMC_POWER_OFF:
1497 mmc_slot(host).set_power(host->dev, host->slot_id,
1498 0, 0);
1499 host->vdd = 0;
1500 break;
1501 case MMC_POWER_UP:
1502 mmc_slot(host).set_power(host->dev, host->slot_id,
1503 1, ios->vdd);
1504 host->vdd = ios->vdd;
1505 break;
1506 case MMC_POWER_ON:
1507 do_send_init_stream = 1;
1508 break;
1509 }
1510 host->power_mode = ios->power_mode;
1511 }
1512
1513 /* FIXME: set registers based only on changes to ios */
1514
1515 con = OMAP_HSMMC_READ(host->base, CON);
1516 switch (mmc->ios.bus_width) {
1517 case MMC_BUS_WIDTH_8:
1518 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
1519 break;
1520 case MMC_BUS_WIDTH_4:
1521 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1522 OMAP_HSMMC_WRITE(host->base, HCTL,
1523 OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
1524 break;
1525 case MMC_BUS_WIDTH_1:
1526 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
1527 OMAP_HSMMC_WRITE(host->base, HCTL,
1528 OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
1529 break;
1530 }
1531
1532 if (host->id == OMAP_MMC1_DEVID) {
1533 /* Only MMC1 can interface at 3V without some flavor
1534 * of external transceiver; but they all handle 1.8V.
1535 */
1536 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1537 (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1538 /*
1539 * The mmc_select_voltage fn of the core does
1540 * not seem to set the power_mode to
1541 * MMC_POWER_UP upon recalculating the voltage.
1542 * vdd 1.8v.
1543 */
1544 if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1545 dev_dbg(mmc_dev(host->mmc),
1546 "Switch operation failed\n");
1547 }
1548 }
1549
1550 if (ios->clock) {
1551 dsor = OMAP_MMC_MASTER_CLOCK / ios->clock;
1552 if (dsor < 1)
1553 dsor = 1;
1554
1555 if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock)
1556 dsor++;
1557
1558 if (dsor > 250)
1559 dsor = 250;
1560 }
1561 omap_hsmmc_stop_clock(host);
1562 regval = OMAP_HSMMC_READ(host->base, SYSCTL);
1563 regval = regval & ~(CLKD_MASK);
1564 regval = regval | (dsor << 6) | (DTO << 16);
1565 OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
1566 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1567 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
1568
1569 /* Wait till the ICS bit is set */
1570 timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
1571 while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
1572 && time_before(jiffies, timeout))
1573 msleep(1);
1574
1575 OMAP_HSMMC_WRITE(host->base, SYSCTL,
1576 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
1577
1578 if (do_send_init_stream)
1579 send_init_stream(host);
1580
1581 con = OMAP_HSMMC_READ(host->base, CON);
1582 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
1583 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
1584 else
1585 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
1586
1587 if (host->power_mode == MMC_POWER_OFF)
1588 mmc_host_disable(host->mmc);
1589 else
1590 mmc_host_lazy_disable(host->mmc);
1591 }
1592
1593 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1594 {
1595 struct omap_hsmmc_host *host = mmc_priv(mmc);
1596
1597 if (!mmc_slot(host).card_detect)
1598 return -ENOSYS;
1599 return mmc_slot(host).card_detect(host->dev, host->slot_id);
1600 }
1601
1602 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1603 {
1604 struct omap_hsmmc_host *host = mmc_priv(mmc);
1605
1606 if (!mmc_slot(host).get_ro)
1607 return -ENOSYS;
1608 return mmc_slot(host).get_ro(host->dev, 0);
1609 }
1610
1611 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1612 {
1613 struct omap_hsmmc_host *host = mmc_priv(mmc);
1614
1615 if (mmc_slot(host).init_card)
1616 mmc_slot(host).init_card(card);
1617 }
1618
1619 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1620 {
1621 u32 hctl, capa, value;
1622
1623 /* Only MMC1 supports 3.0V */
1624 if (host->id == OMAP_MMC1_DEVID) {
1625 hctl = SDVS30;
1626 capa = VS30 | VS18;
1627 } else {
1628 hctl = SDVS18;
1629 capa = VS18;
1630 }
1631
1632 value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1633 OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1634
1635 value = OMAP_HSMMC_READ(host->base, CAPA);
1636 OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1637
1638 /* Set the controller to AUTO IDLE mode */
1639 value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1640 OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1641
1642 /* Set SD bus power bit */
1643 set_sd_bus_power(host);
1644 }
1645
1646 /*
1647 * Dynamic power saving handling, FSM:
1648 * ENABLED -> DISABLED -> CARDSLEEP / REGSLEEP -> OFF
1649 * ^___________| | |
1650 * |______________________|______________________|
1651 *
1652 * ENABLED: mmc host is fully functional
1653 * DISABLED: fclk is off
1654 * CARDSLEEP: fclk is off, card is asleep, voltage regulator is asleep
1655 * REGSLEEP: fclk is off, voltage regulator is asleep
1656 * OFF: fclk is off, voltage regulator is off
1657 *
1658 * Transition handlers return the timeout for the next state transition
1659 * or negative error.
1660 */
1661
1662 enum {ENABLED = 0, DISABLED, CARDSLEEP, REGSLEEP, OFF};
1663
1664 /* Handler for [ENABLED -> DISABLED] transition */
1665 static int omap_hsmmc_enabled_to_disabled(struct omap_hsmmc_host *host)
1666 {
1667 omap_hsmmc_context_save(host);
1668 clk_disable(host->fclk);
1669 host->dpm_state = DISABLED;
1670
1671 dev_dbg(mmc_dev(host->mmc), "ENABLED -> DISABLED\n");
1672
1673 if (host->power_mode == MMC_POWER_OFF)
1674 return 0;
1675
1676 return OMAP_MMC_SLEEP_TIMEOUT;
1677 }
1678
1679 /* Handler for [DISABLED -> REGSLEEP / CARDSLEEP] transition */
1680 static int omap_hsmmc_disabled_to_sleep(struct omap_hsmmc_host *host)
1681 {
1682 int err, new_state;
1683
1684 if (!mmc_try_claim_host(host->mmc))
1685 return 0;
1686
1687 clk_enable(host->fclk);
1688 omap_hsmmc_context_restore(host);
1689 if (mmc_card_can_sleep(host->mmc)) {
1690 err = mmc_card_sleep(host->mmc);
1691 if (err < 0) {
1692 clk_disable(host->fclk);
1693 mmc_release_host(host->mmc);
1694 return err;
1695 }
1696 new_state = CARDSLEEP;
1697 } else {
1698 new_state = REGSLEEP;
1699 }
1700 if (mmc_slot(host).set_sleep)
1701 mmc_slot(host).set_sleep(host->dev, host->slot_id, 1, 0,
1702 new_state == CARDSLEEP);
1703 /* FIXME: turn off bus power and perhaps interrupts too */
1704 clk_disable(host->fclk);
1705 host->dpm_state = new_state;
1706
1707 mmc_release_host(host->mmc);
1708
1709 dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n",
1710 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1711
1712 if (mmc_slot(host).no_off)
1713 return 0;
1714
1715 if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1716 mmc_slot(host).card_detect ||
1717 (mmc_slot(host).get_cover_state &&
1718 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))
1719 return OMAP_MMC_OFF_TIMEOUT;
1720
1721 return 0;
1722 }
1723
1724 /* Handler for [REGSLEEP / CARDSLEEP -> OFF] transition */
1725 static int omap_hsmmc_sleep_to_off(struct omap_hsmmc_host *host)
1726 {
1727 if (!mmc_try_claim_host(host->mmc))
1728 return 0;
1729
1730 if (mmc_slot(host).no_off)
1731 return 0;
1732
1733 if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
1734 mmc_slot(host).card_detect ||
1735 (mmc_slot(host).get_cover_state &&
1736 mmc_slot(host).get_cover_state(host->dev, host->slot_id)))) {
1737 mmc_release_host(host->mmc);
1738 return 0;
1739 }
1740
1741 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1742 host->vdd = 0;
1743 host->power_mode = MMC_POWER_OFF;
1744
1745 dev_dbg(mmc_dev(host->mmc), "%s -> OFF\n",
1746 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1747
1748 host->dpm_state = OFF;
1749
1750 mmc_release_host(host->mmc);
1751
1752 return 0;
1753 }
1754
1755 /* Handler for [DISABLED -> ENABLED] transition */
1756 static int omap_hsmmc_disabled_to_enabled(struct omap_hsmmc_host *host)
1757 {
1758 int err;
1759
1760 err = clk_enable(host->fclk);
1761 if (err < 0)
1762 return err;
1763
1764 omap_hsmmc_context_restore(host);
1765 host->dpm_state = ENABLED;
1766
1767 dev_dbg(mmc_dev(host->mmc), "DISABLED -> ENABLED\n");
1768
1769 return 0;
1770 }
1771
1772 /* Handler for [SLEEP -> ENABLED] transition */
1773 static int omap_hsmmc_sleep_to_enabled(struct omap_hsmmc_host *host)
1774 {
1775 if (!mmc_try_claim_host(host->mmc))
1776 return 0;
1777
1778 clk_enable(host->fclk);
1779 omap_hsmmc_context_restore(host);
1780 if (mmc_slot(host).set_sleep)
1781 mmc_slot(host).set_sleep(host->dev, host->slot_id, 0,
1782 host->vdd, host->dpm_state == CARDSLEEP);
1783 if (mmc_card_can_sleep(host->mmc))
1784 mmc_card_awake(host->mmc);
1785
1786 dev_dbg(mmc_dev(host->mmc), "%s -> ENABLED\n",
1787 host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
1788
1789 host->dpm_state = ENABLED;
1790
1791 mmc_release_host(host->mmc);
1792
1793 return 0;
1794 }
1795
1796 /* Handler for [OFF -> ENABLED] transition */
1797 static int omap_hsmmc_off_to_enabled(struct omap_hsmmc_host *host)
1798 {
1799 clk_enable(host->fclk);
1800
1801 omap_hsmmc_context_restore(host);
1802 omap_hsmmc_conf_bus_power(host);
1803 mmc_power_restore_host(host->mmc);
1804
1805 host->dpm_state = ENABLED;
1806
1807 dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n");
1808
1809 return 0;
1810 }
1811
1812 /*
1813 * Bring MMC host to ENABLED from any other PM state.
1814 */
1815 static int omap_hsmmc_enable(struct mmc_host *mmc)
1816 {
1817 struct omap_hsmmc_host *host = mmc_priv(mmc);
1818
1819 switch (host->dpm_state) {
1820 case DISABLED:
1821 return omap_hsmmc_disabled_to_enabled(host);
1822 case CARDSLEEP:
1823 case REGSLEEP:
1824 return omap_hsmmc_sleep_to_enabled(host);
1825 case OFF:
1826 return omap_hsmmc_off_to_enabled(host);
1827 default:
1828 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1829 return -EINVAL;
1830 }
1831 }
1832
1833 /*
1834 * Bring MMC host in PM state (one level deeper).
1835 */
1836 static int omap_hsmmc_disable(struct mmc_host *mmc, int lazy)
1837 {
1838 struct omap_hsmmc_host *host = mmc_priv(mmc);
1839
1840 switch (host->dpm_state) {
1841 case ENABLED: {
1842 int delay;
1843
1844 delay = omap_hsmmc_enabled_to_disabled(host);
1845 if (lazy || delay < 0)
1846 return delay;
1847 return 0;
1848 }
1849 case DISABLED:
1850 return omap_hsmmc_disabled_to_sleep(host);
1851 case CARDSLEEP:
1852 case REGSLEEP:
1853 return omap_hsmmc_sleep_to_off(host);
1854 default:
1855 dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n");
1856 return -EINVAL;
1857 }
1858 }
1859
1860 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1861 {
1862 struct omap_hsmmc_host *host = mmc_priv(mmc);
1863 int err;
1864
1865 err = clk_enable(host->fclk);
1866 if (err)
1867 return err;
1868 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
1869 omap_hsmmc_context_restore(host);
1870 return 0;
1871 }
1872
1873 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
1874 {
1875 struct omap_hsmmc_host *host = mmc_priv(mmc);
1876
1877 omap_hsmmc_context_save(host);
1878 clk_disable(host->fclk);
1879 dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
1880 return 0;
1881 }
1882
1883 static const struct mmc_host_ops omap_hsmmc_ops = {
1884 .enable = omap_hsmmc_enable_fclk,
1885 .disable = omap_hsmmc_disable_fclk,
1886 .request = omap_hsmmc_request,
1887 .set_ios = omap_hsmmc_set_ios,
1888 .get_cd = omap_hsmmc_get_cd,
1889 .get_ro = omap_hsmmc_get_ro,
1890 .init_card = omap_hsmmc_init_card,
1891 /* NYET -- enable_sdio_irq */
1892 };
1893
1894 static const struct mmc_host_ops omap_hsmmc_ps_ops = {
1895 .enable = omap_hsmmc_enable,
1896 .disable = omap_hsmmc_disable,
1897 .request = omap_hsmmc_request,
1898 .set_ios = omap_hsmmc_set_ios,
1899 .get_cd = omap_hsmmc_get_cd,
1900 .get_ro = omap_hsmmc_get_ro,
1901 .init_card = omap_hsmmc_init_card,
1902 /* NYET -- enable_sdio_irq */
1903 };
1904
1905 #ifdef CONFIG_DEBUG_FS
1906
1907 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1908 {
1909 struct mmc_host *mmc = s->private;
1910 struct omap_hsmmc_host *host = mmc_priv(mmc);
1911 int context_loss = 0;
1912
1913 if (host->pdata->get_context_loss_count)
1914 context_loss = host->pdata->get_context_loss_count(host->dev);
1915
1916 seq_printf(s, "mmc%d:\n"
1917 " enabled:\t%d\n"
1918 " dpm_state:\t%d\n"
1919 " nesting_cnt:\t%d\n"
1920 " ctx_loss:\t%d:%d\n"
1921 "\nregs:\n",
1922 mmc->index, mmc->enabled ? 1 : 0,
1923 host->dpm_state, mmc->nesting_cnt,
1924 host->context_loss, context_loss);
1925
1926 if (host->suspended || host->dpm_state == OFF) {
1927 seq_printf(s, "host suspended, can't read registers\n");
1928 return 0;
1929 }
1930
1931 if (clk_enable(host->fclk) != 0) {
1932 seq_printf(s, "can't read the regs\n");
1933 return 0;
1934 }
1935
1936 seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1937 OMAP_HSMMC_READ(host->base, SYSCONFIG));
1938 seq_printf(s, "CON:\t\t0x%08x\n",
1939 OMAP_HSMMC_READ(host->base, CON));
1940 seq_printf(s, "HCTL:\t\t0x%08x\n",
1941 OMAP_HSMMC_READ(host->base, HCTL));
1942 seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1943 OMAP_HSMMC_READ(host->base, SYSCTL));
1944 seq_printf(s, "IE:\t\t0x%08x\n",
1945 OMAP_HSMMC_READ(host->base, IE));
1946 seq_printf(s, "ISE:\t\t0x%08x\n",
1947 OMAP_HSMMC_READ(host->base, ISE));
1948 seq_printf(s, "CAPA:\t\t0x%08x\n",
1949 OMAP_HSMMC_READ(host->base, CAPA));
1950
1951 clk_disable(host->fclk);
1952
1953 return 0;
1954 }
1955
1956 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1957 {
1958 return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1959 }
1960
1961 static const struct file_operations mmc_regs_fops = {
1962 .open = omap_hsmmc_regs_open,
1963 .read = seq_read,
1964 .llseek = seq_lseek,
1965 .release = single_release,
1966 };
1967
1968 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1969 {
1970 if (mmc->debugfs_root)
1971 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1972 mmc, &mmc_regs_fops);
1973 }
1974
1975 #else
1976
1977 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1978 {
1979 }
1980
1981 #endif
1982
1983 static int __init omap_hsmmc_probe(struct platform_device *pdev)
1984 {
1985 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1986 struct mmc_host *mmc;
1987 struct omap_hsmmc_host *host = NULL;
1988 struct resource *res;
1989 int ret, irq;
1990
1991 if (pdata == NULL) {
1992 dev_err(&pdev->dev, "Platform Data is missing\n");
1993 return -ENXIO;
1994 }
1995
1996 if (pdata->nr_slots == 0) {
1997 dev_err(&pdev->dev, "No Slots\n");
1998 return -ENXIO;
1999 }
2000
2001 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2002 irq = platform_get_irq(pdev, 0);
2003 if (res == NULL || irq < 0)
2004 return -ENXIO;
2005
2006 res = request_mem_region(res->start, res->end - res->start + 1,
2007 pdev->name);
2008 if (res == NULL)
2009 return -EBUSY;
2010
2011 ret = omap_hsmmc_gpio_init(pdata);
2012 if (ret)
2013 goto err;
2014
2015 mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
2016 if (!mmc) {
2017 ret = -ENOMEM;
2018 goto err_alloc;
2019 }
2020
2021 host = mmc_priv(mmc);
2022 host->mmc = mmc;
2023 host->pdata = pdata;
2024 host->dev = &pdev->dev;
2025 host->use_dma = 1;
2026 host->dev->dma_mask = &pdata->dma_mask;
2027 host->dma_ch = -1;
2028 host->irq = irq;
2029 host->id = pdev->id;
2030 host->slot_id = 0;
2031 host->mapbase = res->start;
2032 host->base = ioremap(host->mapbase, SZ_4K);
2033 host->power_mode = MMC_POWER_OFF;
2034
2035 platform_set_drvdata(pdev, host);
2036 INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect);
2037
2038 if (mmc_slot(host).power_saving)
2039 mmc->ops = &omap_hsmmc_ps_ops;
2040 else
2041 mmc->ops = &omap_hsmmc_ops;
2042
2043 /*
2044 * If regulator_disable can only put vcc_aux to sleep then there is
2045 * no off state.
2046 */
2047 if (mmc_slot(host).vcc_aux_disable_is_sleep)
2048 mmc_slot(host).no_off = 1;
2049
2050 mmc->f_min = 400000;
2051 mmc->f_max = 52000000;
2052
2053 spin_lock_init(&host->irq_lock);
2054
2055 host->iclk = clk_get(&pdev->dev, "ick");
2056 if (IS_ERR(host->iclk)) {
2057 ret = PTR_ERR(host->iclk);
2058 host->iclk = NULL;
2059 goto err1;
2060 }
2061 host->fclk = clk_get(&pdev->dev, "fck");
2062 if (IS_ERR(host->fclk)) {
2063 ret = PTR_ERR(host->fclk);
2064 host->fclk = NULL;
2065 clk_put(host->iclk);
2066 goto err1;
2067 }
2068
2069 omap_hsmmc_context_save(host);
2070
2071 mmc->caps |= MMC_CAP_DISABLE;
2072 mmc_set_disable_delay(mmc, OMAP_MMC_DISABLED_TIMEOUT);
2073 /* we start off in DISABLED state */
2074 host->dpm_state = DISABLED;
2075
2076 if (mmc_host_enable(host->mmc) != 0) {
2077 clk_put(host->iclk);
2078 clk_put(host->fclk);
2079 goto err1;
2080 }
2081
2082 if (clk_enable(host->iclk) != 0) {
2083 mmc_host_disable(host->mmc);
2084 clk_put(host->iclk);
2085 clk_put(host->fclk);
2086 goto err1;
2087 }
2088
2089 if (cpu_is_omap2430()) {
2090 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
2091 /*
2092 * MMC can still work without debounce clock.
2093 */
2094 if (IS_ERR(host->dbclk))
2095 dev_warn(mmc_dev(host->mmc),
2096 "Failed to get debounce clock\n");
2097 else
2098 host->got_dbclk = 1;
2099
2100 if (host->got_dbclk)
2101 if (clk_enable(host->dbclk) != 0)
2102 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
2103 " clk failed\n");
2104 }
2105
2106 /* Since we do only SG emulation, we can have as many segs
2107 * as we want. */
2108 mmc->max_phys_segs = 1024;
2109 mmc->max_hw_segs = 1024;
2110
2111 mmc->max_blk_size = 512; /* Block Length at max can be 1024 */
2112 mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */
2113 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2114 mmc->max_seg_size = mmc->max_req_size;
2115
2116 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2117 MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2118
2119 switch (mmc_slot(host).wires) {
2120 case 8:
2121 mmc->caps |= MMC_CAP_8_BIT_DATA;
2122 /* Fall through */
2123 case 4:
2124 mmc->caps |= MMC_CAP_4_BIT_DATA;
2125 break;
2126 case 1:
2127 /* Nothing to crib here */
2128 case 0:
2129 /* Assuming nothing was given by board, Core use's 1-Bit */
2130 break;
2131 default:
2132 /* Completely unexpected.. Core goes with 1-Bit Width */
2133 dev_crit(mmc_dev(host->mmc), "Invalid width %d\n used!"
2134 "using 1 instead\n", mmc_slot(host).wires);
2135 }
2136
2137 if (mmc_slot(host).nonremovable)
2138 mmc->caps |= MMC_CAP_NONREMOVABLE;
2139
2140 omap_hsmmc_conf_bus_power(host);
2141
2142 /* Select DMA lines */
2143 switch (host->id) {
2144 case OMAP_MMC1_DEVID:
2145 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
2146 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
2147 break;
2148 case OMAP_MMC2_DEVID:
2149 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
2150 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
2151 break;
2152 case OMAP_MMC3_DEVID:
2153 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
2154 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
2155 break;
2156 case OMAP_MMC4_DEVID:
2157 host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
2158 host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
2159 break;
2160 case OMAP_MMC5_DEVID:
2161 host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
2162 host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
2163 break;
2164 default:
2165 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
2166 goto err_irq;
2167 }
2168
2169 /* Request IRQ for MMC operations */
2170 ret = request_irq(host->irq, omap_hsmmc_irq, IRQF_DISABLED,
2171 mmc_hostname(mmc), host);
2172 if (ret) {
2173 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2174 goto err_irq;
2175 }
2176
2177 if (pdata->init != NULL) {
2178 if (pdata->init(&pdev->dev) != 0) {
2179 dev_dbg(mmc_dev(host->mmc),
2180 "Unable to configure MMC IRQs\n");
2181 goto err_irq_cd_init;
2182 }
2183 }
2184
2185 if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2186 ret = omap_hsmmc_reg_get(host);
2187 if (ret)
2188 goto err_reg;
2189 host->use_reg = 1;
2190 }
2191
2192 mmc->ocr_avail = mmc_slot(host).ocr_mask;
2193
2194 /* Request IRQ for card detect */
2195 if ((mmc_slot(host).card_detect_irq)) {
2196 ret = request_irq(mmc_slot(host).card_detect_irq,
2197 omap_hsmmc_cd_handler,
2198 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
2199 | IRQF_DISABLED,
2200 mmc_hostname(mmc), host);
2201 if (ret) {
2202 dev_dbg(mmc_dev(host->mmc),
2203 "Unable to grab MMC CD IRQ\n");
2204 goto err_irq_cd;
2205 }
2206 }
2207
2208 omap_hsmmc_disable_irq(host);
2209
2210 mmc_host_lazy_disable(host->mmc);
2211
2212 omap_hsmmc_protect_card(host);
2213
2214 mmc_add_host(mmc);
2215
2216 if (mmc_slot(host).name != NULL) {
2217 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2218 if (ret < 0)
2219 goto err_slot_name;
2220 }
2221 if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2222 ret = device_create_file(&mmc->class_dev,
2223 &dev_attr_cover_switch);
2224 if (ret < 0)
2225 goto err_slot_name;
2226 }
2227
2228 omap_hsmmc_debugfs(mmc);
2229
2230 return 0;
2231
2232 err_slot_name:
2233 mmc_remove_host(mmc);
2234 free_irq(mmc_slot(host).card_detect_irq, host);
2235 err_irq_cd:
2236 if (host->use_reg)
2237 omap_hsmmc_reg_put(host);
2238 err_reg:
2239 if (host->pdata->cleanup)
2240 host->pdata->cleanup(&pdev->dev);
2241 err_irq_cd_init:
2242 free_irq(host->irq, host);
2243 err_irq:
2244 mmc_host_disable(host->mmc);
2245 clk_disable(host->iclk);
2246 clk_put(host->fclk);
2247 clk_put(host->iclk);
2248 if (host->got_dbclk) {
2249 clk_disable(host->dbclk);
2250 clk_put(host->dbclk);
2251 }
2252 err1:
2253 iounmap(host->base);
2254 platform_set_drvdata(pdev, NULL);
2255 mmc_free_host(mmc);
2256 err_alloc:
2257 omap_hsmmc_gpio_free(pdata);
2258 err:
2259 release_mem_region(res->start, res->end - res->start + 1);
2260 return ret;
2261 }
2262
2263 static int omap_hsmmc_remove(struct platform_device *pdev)
2264 {
2265 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2266 struct resource *res;
2267
2268 if (host) {
2269 mmc_host_enable(host->mmc);
2270 mmc_remove_host(host->mmc);
2271 if (host->use_reg)
2272 omap_hsmmc_reg_put(host);
2273 if (host->pdata->cleanup)
2274 host->pdata->cleanup(&pdev->dev);
2275 free_irq(host->irq, host);
2276 if (mmc_slot(host).card_detect_irq)
2277 free_irq(mmc_slot(host).card_detect_irq, host);
2278 flush_scheduled_work();
2279
2280 mmc_host_disable(host->mmc);
2281 clk_disable(host->iclk);
2282 clk_put(host->fclk);
2283 clk_put(host->iclk);
2284 if (host->got_dbclk) {
2285 clk_disable(host->dbclk);
2286 clk_put(host->dbclk);
2287 }
2288
2289 mmc_free_host(host->mmc);
2290 iounmap(host->base);
2291 omap_hsmmc_gpio_free(pdev->dev.platform_data);
2292 }
2293
2294 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2295 if (res)
2296 release_mem_region(res->start, res->end - res->start + 1);
2297 platform_set_drvdata(pdev, NULL);
2298
2299 return 0;
2300 }
2301
2302 #ifdef CONFIG_PM
2303 static int omap_hsmmc_suspend(struct device *dev)
2304 {
2305 int ret = 0;
2306 struct platform_device *pdev = to_platform_device(dev);
2307 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2308 pm_message_t state = PMSG_SUSPEND; /* unused by MMC core */
2309
2310 if (host && host->suspended)
2311 return 0;
2312
2313 if (host) {
2314 host->suspended = 1;
2315 if (host->pdata->suspend) {
2316 ret = host->pdata->suspend(&pdev->dev,
2317 host->slot_id);
2318 if (ret) {
2319 dev_dbg(mmc_dev(host->mmc),
2320 "Unable to handle MMC board"
2321 " level suspend\n");
2322 host->suspended = 0;
2323 return ret;
2324 }
2325 }
2326 cancel_work_sync(&host->mmc_carddetect_work);
2327 mmc_host_enable(host->mmc);
2328 ret = mmc_suspend_host(host->mmc);
2329 if (ret == 0) {
2330 omap_hsmmc_disable_irq(host);
2331 OMAP_HSMMC_WRITE(host->base, HCTL,
2332 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2333 mmc_host_disable(host->mmc);
2334 clk_disable(host->iclk);
2335 if (host->got_dbclk)
2336 clk_disable(host->dbclk);
2337 } else {
2338 host->suspended = 0;
2339 if (host->pdata->resume) {
2340 ret = host->pdata->resume(&pdev->dev,
2341 host->slot_id);
2342 if (ret)
2343 dev_dbg(mmc_dev(host->mmc),
2344 "Unmask interrupt failed\n");
2345 }
2346 mmc_host_disable(host->mmc);
2347 }
2348
2349 }
2350 return ret;
2351 }
2352
2353 /* Routine to resume the MMC device */
2354 static int omap_hsmmc_resume(struct device *dev)
2355 {
2356 int ret = 0;
2357 struct platform_device *pdev = to_platform_device(dev);
2358 struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2359
2360 if (host && !host->suspended)
2361 return 0;
2362
2363 if (host) {
2364 ret = clk_enable(host->iclk);
2365 if (ret)
2366 goto clk_en_err;
2367
2368 if (mmc_host_enable(host->mmc) != 0) {
2369 clk_disable(host->iclk);
2370 goto clk_en_err;
2371 }
2372
2373 if (host->got_dbclk)
2374 clk_enable(host->dbclk);
2375
2376 omap_hsmmc_conf_bus_power(host);
2377
2378 if (host->pdata->resume) {
2379 ret = host->pdata->resume(&pdev->dev, host->slot_id);
2380 if (ret)
2381 dev_dbg(mmc_dev(host->mmc),
2382 "Unmask interrupt failed\n");
2383 }
2384
2385 omap_hsmmc_protect_card(host);
2386
2387 /* Notify the core to resume the host */
2388 ret = mmc_resume_host(host->mmc);
2389 if (ret == 0)
2390 host->suspended = 0;
2391
2392 mmc_host_lazy_disable(host->mmc);
2393 }
2394
2395 return ret;
2396
2397 clk_en_err:
2398 dev_dbg(mmc_dev(host->mmc),
2399 "Failed to enable MMC clocks during resume\n");
2400 return ret;
2401 }
2402
2403 #else
2404 #define omap_hsmmc_suspend NULL
2405 #define omap_hsmmc_resume NULL
2406 #endif
2407
2408 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2409 .suspend = omap_hsmmc_suspend,
2410 .resume = omap_hsmmc_resume,
2411 };
2412
2413 static struct platform_driver omap_hsmmc_driver = {
2414 .remove = omap_hsmmc_remove,
2415 .driver = {
2416 .name = DRIVER_NAME,
2417 .owner = THIS_MODULE,
2418 .pm = &omap_hsmmc_dev_pm_ops,
2419 },
2420 };
2421
2422 static int __init omap_hsmmc_init(void)
2423 {
2424 /* Register the MMC driver */
2425 return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe);
2426 }
2427
2428 static void __exit omap_hsmmc_cleanup(void)
2429 {
2430 /* Unregister MMC driver */
2431 platform_driver_unregister(&omap_hsmmc_driver);
2432 }
2433
2434 module_init(omap_hsmmc_init);
2435 module_exit(omap_hsmmc_cleanup);
2436
2437 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2438 MODULE_LICENSE("GPL");
2439 MODULE_ALIAS("platform:" DRIVER_NAME);
2440 MODULE_AUTHOR("Texas Instruments Inc");
kernel source for telekom puls (alcatel/mediatek)