Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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/kernel.h>
 21 #include <linux/debugfs.h>
 22 #include <linux/dmaengine.h>
 23 #include <linux/seq_file.h>
 24 #include <linux/sizes.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/delay.h>
 27 #include <linux/dma-mapping.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/timer.h>
 30 #include <linux/clk.h>
 31 #include <linux/of.h>
 32 #include <linux/of_irq.h>
 33 #include <linux/of_gpio.h>
 34 #include <linux/of_device.h>
 35 #include <linux/omap-dmaengine.h>
 36 #include <linux/mmc/host.h>
 37 #include <linux/mmc/core.h>
 38 #include <linux/mmc/mmc.h>
 39 #include <linux/io.h>
 40 #include <linux/irq.h>
 41 #include <linux/gpio.h>
 42 #include <linux/regulator/consumer.h>
 43 #include <linux/pinctrl/consumer.h>
 44 #include <linux/pm_runtime.h>
 45 #include <linux/platform_data/mmc-omap.h>
 46 
 47 /* OMAP HSMMC Host Controller Registers */
 48 #define OMAP_HSMMC_SYSSTATUS    0x0014
 49 #define OMAP_HSMMC_CON          0x002C
 50 #define OMAP_HSMMC_SDMASA       0x0100
 51 #define OMAP_HSMMC_BLK          0x0104
 52 #define OMAP_HSMMC_ARG          0x0108
 53 #define OMAP_HSMMC_CMD          0x010C
 54 #define OMAP_HSMMC_RSP10        0x0110
 55 #define OMAP_HSMMC_RSP32        0x0114
 56 #define OMAP_HSMMC_RSP54        0x0118
 57 #define OMAP_HSMMC_RSP76        0x011C
 58 #define OMAP_HSMMC_DATA         0x0120
 59 #define OMAP_HSMMC_PSTATE       0x0124
 60 #define OMAP_HSMMC_HCTL         0x0128
 61 #define OMAP_HSMMC_SYSCTL       0x012C
 62 #define OMAP_HSMMC_STAT         0x0130
 63 #define OMAP_HSMMC_IE           0x0134
 64 #define OMAP_HSMMC_ISE          0x0138
 65 #define OMAP_HSMMC_AC12         0x013C
 66 #define OMAP_HSMMC_CAPA         0x0140
 67 
 68 #define VS18                    (1 << 26)
 69 #define VS30                    (1 << 25)
 70 #define HSS                     (1 << 21)
 71 #define SDVS18                  (0x5 << 9)
 72 #define SDVS30                  (0x6 << 9)
 73 #define SDVS33                  (0x7 << 9)
 74 #define SDVS_MASK               0x00000E00
 75 #define SDVSCLR                 0xFFFFF1FF
 76 #define SDVSDET                 0x00000400
 77 #define AUTOIDLE                0x1
 78 #define SDBP                    (1 << 8)
 79 #define DTO                     0xe
 80 #define ICE                     0x1
 81 #define ICS                     0x2
 82 #define CEN                     (1 << 2)
 83 #define CLKD_MAX                0x3FF           /* max clock divisor: 1023 */
 84 #define CLKD_MASK               0x0000FFC0
 85 #define CLKD_SHIFT              6
 86 #define DTO_MASK                0x000F0000
 87 #define DTO_SHIFT               16
 88 #define INIT_STREAM             (1 << 1)
 89 #define ACEN_ACMD23             (2 << 2)
 90 #define DP_SELECT               (1 << 21)
 91 #define DDIR                    (1 << 4)
 92 #define DMAE                    0x1
 93 #define MSBS                    (1 << 5)
 94 #define BCE                     (1 << 1)
 95 #define FOUR_BIT                (1 << 1)
 96 #define HSPE                    (1 << 2)
 97 #define IWE                     (1 << 24)
 98 #define DDR                     (1 << 19)
 99 #define CLKEXTFREE              (1 << 16)
100 #define CTPL                    (1 << 11)
101 #define DW8                     (1 << 5)
102 #define OD                      0x1
103 #define STAT_CLEAR              0xFFFFFFFF
104 #define INIT_STREAM_CMD         0x00000000
105 #define DUAL_VOLT_OCR_BIT       7
106 #define SRC                     (1 << 25)
107 #define SRD                     (1 << 26)
108 #define SOFTRESET               (1 << 1)
109 
110 /* PSTATE */
111 #define DLEV_DAT(x)             (1 << (20 + (x)))
112 
113 /* Interrupt masks for IE and ISE register */
114 #define CC_EN                   (1 << 0)
115 #define TC_EN                   (1 << 1)
116 #define BWR_EN                  (1 << 4)
117 #define BRR_EN                  (1 << 5)
118 #define CIRQ_EN                 (1 << 8)
119 #define ERR_EN                  (1 << 15)
120 #define CTO_EN                  (1 << 16)
121 #define CCRC_EN                 (1 << 17)
122 #define CEB_EN                  (1 << 18)
123 #define CIE_EN                  (1 << 19)
124 #define DTO_EN                  (1 << 20)
125 #define DCRC_EN                 (1 << 21)
126 #define DEB_EN                  (1 << 22)
127 #define ACE_EN                  (1 << 24)
128 #define CERR_EN                 (1 << 28)
129 #define BADA_EN                 (1 << 29)
130 
131 #define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
132                 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
133                 BRR_EN | BWR_EN | TC_EN | CC_EN)
134 
135 #define CNI     (1 << 7)
136 #define ACIE    (1 << 4)
137 #define ACEB    (1 << 3)
138 #define ACCE    (1 << 2)
139 #define ACTO    (1 << 1)
140 #define ACNE    (1 << 0)
141 
142 #define MMC_AUTOSUSPEND_DELAY   100
143 #define MMC_TIMEOUT_MS          20              /* 20 mSec */
144 #define MMC_TIMEOUT_US          20000           /* 20000 micro Sec */
145 #define OMAP_MMC_MIN_CLOCK      400000
146 #define OMAP_MMC_MAX_CLOCK      52000000
147 #define DRIVER_NAME             "omap_hsmmc"
148 
149 #define VDD_1V8                 1800000         /* 180000 uV */
150 #define VDD_3V0                 3000000         /* 300000 uV */
151 #define VDD_165_195             (ffs(MMC_VDD_165_195) - 1)
152 
153 /*
154  * One controller can have multiple slots, like on some omap boards using
155  * omap.c controller driver. Luckily this is not currently done on any known
156  * omap_hsmmc.c device.
157  */
158 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
159 
160 /*
161  * MMC Host controller read/write API's
162  */
163 #define OMAP_HSMMC_READ(base, reg)      \
164         __raw_readl((base) + OMAP_HSMMC_##reg)
165 
166 #define OMAP_HSMMC_WRITE(base, reg, val) \
167         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
168 
169 struct omap_hsmmc_next {
170         unsigned int    dma_len;
171         s32             cookie;
172 };
173 
174 struct omap_hsmmc_host {
175         struct  device          *dev;
176         struct  mmc_host        *mmc;
177         struct  mmc_request     *mrq;
178         struct  mmc_command     *cmd;
179         struct  mmc_data        *data;
180         struct  clk             *fclk;
181         struct  clk             *dbclk;
182         /*
183          * vcc == configured supply
184          * vcc_aux == optional
185          *   -  MMC1, supply for DAT4..DAT7
186          *   -  MMC2/MMC2, external level shifter voltage supply, for
187          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
188          */
189         struct  regulator       *vcc;
190         struct  regulator       *vcc_aux;
191         struct  regulator       *pbias;
192         bool                    pbias_enabled;
193         void    __iomem         *base;
194         resource_size_t         mapbase;
195         spinlock_t              irq_lock; /* Prevent races with irq handler */
196         unsigned int            dma_len;
197         unsigned int            dma_sg_idx;
198         unsigned char           bus_mode;
199         unsigned char           power_mode;
200         int                     suspended;
201         u32                     con;
202         u32                     hctl;
203         u32                     sysctl;
204         u32                     capa;
205         int                     irq;
206         int                     wake_irq;
207         int                     use_dma, dma_ch;
208         struct dma_chan         *tx_chan;
209         struct dma_chan         *rx_chan;
210         int                     slot_id;
211         int                     response_busy;
212         int                     context_loss;
213         int                     protect_card;
214         int                     reqs_blocked;
215         int                     use_reg;
216         int                     req_in_progress;
217         unsigned long           clk_rate;
218         unsigned int            flags;
219 #define AUTO_CMD23              (1 << 0)        /* Auto CMD23 support */
220 #define HSMMC_SDIO_IRQ_ENABLED  (1 << 1)        /* SDIO irq enabled */
221 #define HSMMC_WAKE_IRQ_ENABLED  (1 << 2)
222         struct omap_hsmmc_next  next_data;
223         struct  omap_mmc_platform_data  *pdata;
224 };
225 
226 struct omap_mmc_of_data {
227         u32 reg_offset;
228         u8 controller_flags;
229 };
230 
231 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
232 
233 static int omap_hsmmc_card_detect(struct device *dev, int slot)
234 {
235         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
236         struct omap_mmc_platform_data *mmc = host->pdata;
237 
238         /* NOTE: assumes card detect signal is active-low */
239         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
240 }
241 
242 static int omap_hsmmc_get_wp(struct device *dev, int slot)
243 {
244         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
245         struct omap_mmc_platform_data *mmc = host->pdata;
246 
247         /* NOTE: assumes write protect signal is active-high */
248         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
249 }
250 
251 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
252 {
253         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
254         struct omap_mmc_platform_data *mmc = host->pdata;
255 
256         /* NOTE: assumes card detect signal is active-low */
257         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
258 }
259 
260 #ifdef CONFIG_PM
261 
262 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
263 {
264         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
265         struct omap_mmc_platform_data *mmc = host->pdata;
266 
267         disable_irq(mmc->slots[0].card_detect_irq);
268         return 0;
269 }
270 
271 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
272 {
273         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
274         struct omap_mmc_platform_data *mmc = host->pdata;
275 
276         enable_irq(mmc->slots[0].card_detect_irq);
277         return 0;
278 }
279 
280 #else
281 
282 #define omap_hsmmc_suspend_cdirq        NULL
283 #define omap_hsmmc_resume_cdirq         NULL
284 
285 #endif
286 
287 #ifdef CONFIG_REGULATOR
288 
289 static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on,
290                                    int vdd)
291 {
292         struct omap_hsmmc_host *host =
293                 platform_get_drvdata(to_platform_device(dev));
294         int ret = 0;
295 
296         /*
297          * If we don't see a Vcc regulator, assume it's a fixed
298          * voltage always-on regulator.
299          */
300         if (!host->vcc)
301                 return 0;
302 
303         if (mmc_slot(host).before_set_reg)
304                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
305 
306         if (host->pbias) {
307                 if (host->pbias_enabled == 1) {
308                         ret = regulator_disable(host->pbias);
309                         if (!ret)
310                                 host->pbias_enabled = 0;
311                 }
312                 regulator_set_voltage(host->pbias, VDD_3V0, VDD_3V0);
313         }
314 
315         /*
316          * Assume Vcc regulator is used only to power the card ... OMAP
317          * VDDS is used to power the pins, optionally with a transceiver to
318          * support cards using voltages other than VDDS (1.8V nominal).  When a
319          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
320          *
321          * In some cases this regulator won't support enable/disable;
322          * e.g. it's a fixed rail for a WLAN chip.
323          *
324          * In other cases vcc_aux switches interface power.  Example, for
325          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
326          * chips/cards need an interface voltage rail too.
327          */
328         if (power_on) {
329                 if (host->vcc)
330                         ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
331                 /* Enable interface voltage rail, if needed */
332                 if (ret == 0 && host->vcc_aux) {
333                         ret = regulator_enable(host->vcc_aux);
334                         if (ret < 0 && host->vcc)
335                                 ret = mmc_regulator_set_ocr(host->mmc,
336                                                         host->vcc, 0);
337                 }
338         } else {
339                 /* Shut down the rail */
340                 if (host->vcc_aux)
341                         ret = regulator_disable(host->vcc_aux);
342                 if (host->vcc) {
343                         /* Then proceed to shut down the local regulator */
344                         ret = mmc_regulator_set_ocr(host->mmc,
345                                                 host->vcc, 0);
346                 }
347         }
348 
349         if (host->pbias) {
350                 if (vdd <= VDD_165_195)
351                         ret = regulator_set_voltage(host->pbias, VDD_1V8,
352                                                                 VDD_1V8);
353                 else
354                         ret = regulator_set_voltage(host->pbias, VDD_3V0,
355                                                                 VDD_3V0);
356                 if (ret < 0)
357                         goto error_set_power;
358 
359                 if (host->pbias_enabled == 0) {
360                         ret = regulator_enable(host->pbias);
361                         if (!ret)
362                                 host->pbias_enabled = 1;
363                 }
364         }
365 
366         if (mmc_slot(host).after_set_reg)
367                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
368 
369 error_set_power:
370         return ret;
371 }
372 
373 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
374 {
375         struct regulator *reg;
376         int ocr_value = 0;
377 
378         reg = devm_regulator_get(host->dev, "vmmc");
379         if (IS_ERR(reg)) {
380                 dev_err(host->dev, "unable to get vmmc regulator %ld\n",
381                         PTR_ERR(reg));
382                 return PTR_ERR(reg);
383         } else {
384                 host->vcc = reg;
385                 ocr_value = mmc_regulator_get_ocrmask(reg);
386                 if (!mmc_slot(host).ocr_mask) {
387                         mmc_slot(host).ocr_mask = ocr_value;
388                 } else {
389                         if (!(mmc_slot(host).ocr_mask & ocr_value)) {
390                                 dev_err(host->dev, "ocrmask %x is not supported\n",
391                                         mmc_slot(host).ocr_mask);
392                                 mmc_slot(host).ocr_mask = 0;
393                                 return -EINVAL;
394                         }
395                 }
396         }
397         mmc_slot(host).set_power = omap_hsmmc_set_power;
398 
399         /* Allow an aux regulator */
400         reg = devm_regulator_get_optional(host->dev, "vmmc_aux");
401         host->vcc_aux = IS_ERR(reg) ? NULL : reg;
402 
403         reg = devm_regulator_get_optional(host->dev, "pbias");
404         host->pbias = IS_ERR(reg) ? NULL : reg;
405 
406         /* For eMMC do not power off when not in sleep state */
407         if (mmc_slot(host).no_regulator_off_init)
408                 return 0;
409         /*
410          * To disable boot_on regulator, enable regulator
411          * to increase usecount and then disable it.
412          */
413         if ((host->vcc && regulator_is_enabled(host->vcc) > 0) ||
414             (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
415                 int vdd = ffs(mmc_slot(host).ocr_mask) - 1;
416 
417                 mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
418                 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
419         }
420 
421         return 0;
422 }
423 
424 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
425 {
426         mmc_slot(host).set_power = NULL;
427 }
428 
429 static inline int omap_hsmmc_have_reg(void)
430 {
431         return 1;
432 }
433 
434 #else
435 
436 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
437 {
438         return -EINVAL;
439 }
440 
441 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
442 {
443 }
444 
445 static inline int omap_hsmmc_have_reg(void)
446 {
447         return 0;
448 }
449 
450 #endif
451 
452 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
453 {
454         int ret;
455 
456         if (gpio_is_valid(pdata->slots[0].switch_pin)) {
457                 if (pdata->slots[0].cover)
458                         pdata->slots[0].get_cover_state =
459                                         omap_hsmmc_get_cover_state;
460                 else
461                         pdata->slots[0].card_detect = omap_hsmmc_card_detect;
462                 pdata->slots[0].card_detect_irq =
463                                 gpio_to_irq(pdata->slots[0].switch_pin);
464                 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
465                 if (ret)
466                         return ret;
467                 ret = gpio_direction_input(pdata->slots[0].switch_pin);
468                 if (ret)
469                         goto err_free_sp;
470         } else
471                 pdata->slots[0].switch_pin = -EINVAL;
472 
473         if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
474                 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
475                 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
476                 if (ret)
477                         goto err_free_cd;
478                 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
479                 if (ret)
480                         goto err_free_wp;
481         } else
482                 pdata->slots[0].gpio_wp = -EINVAL;
483 
484         return 0;
485 
486 err_free_wp:
487         gpio_free(pdata->slots[0].gpio_wp);
488 err_free_cd:
489         if (gpio_is_valid(pdata->slots[0].switch_pin))
490 err_free_sp:
491                 gpio_free(pdata->slots[0].switch_pin);
492         return ret;
493 }
494 
495 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
496 {
497         if (gpio_is_valid(pdata->slots[0].gpio_wp))
498                 gpio_free(pdata->slots[0].gpio_wp);
499         if (gpio_is_valid(pdata->slots[0].switch_pin))
500                 gpio_free(pdata->slots[0].switch_pin);
501 }
502 
503 /*
504  * Start clock to the card
505  */
506 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
507 {
508         OMAP_HSMMC_WRITE(host->base, SYSCTL,
509                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
510 }
511 
512 /*
513  * Stop clock to the card
514  */
515 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
516 {
517         OMAP_HSMMC_WRITE(host->base, SYSCTL,
518                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
519         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
520                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
521 }
522 
523 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
524                                   struct mmc_command *cmd)
525 {
526         u32 irq_mask = INT_EN_MASK;
527         unsigned long flags;
528 
529         if (host->use_dma)
530                 irq_mask &= ~(BRR_EN | BWR_EN);
531 
532         /* Disable timeout for erases */
533         if (cmd->opcode == MMC_ERASE)
534                 irq_mask &= ~DTO_EN;
535 
536         spin_lock_irqsave(&host->irq_lock, flags);
537         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
538         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
539 
540         /* latch pending CIRQ, but don't signal MMC core */
541         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
542                 irq_mask |= CIRQ_EN;
543         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
544         spin_unlock_irqrestore(&host->irq_lock, flags);
545 }
546 
547 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
548 {
549         u32 irq_mask = 0;
550         unsigned long flags;
551 
552         spin_lock_irqsave(&host->irq_lock, flags);
553         /* no transfer running but need to keep cirq if enabled */
554         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
555                 irq_mask |= CIRQ_EN;
556         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
557         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
558         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
559         spin_unlock_irqrestore(&host->irq_lock, flags);
560 }
561 
562 /* Calculate divisor for the given clock frequency */
563 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
564 {
565         u16 dsor = 0;
566 
567         if (ios->clock) {
568                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
569                 if (dsor > CLKD_MAX)
570                         dsor = CLKD_MAX;
571         }
572 
573         return dsor;
574 }
575 
576 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
577 {
578         struct mmc_ios *ios = &host->mmc->ios;
579         unsigned long regval;
580         unsigned long timeout;
581         unsigned long clkdiv;
582 
583         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
584 
585         omap_hsmmc_stop_clock(host);
586 
587         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
588         regval = regval & ~(CLKD_MASK | DTO_MASK);
589         clkdiv = calc_divisor(host, ios);
590         regval = regval | (clkdiv << 6) | (DTO << 16);
591         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
592         OMAP_HSMMC_WRITE(host->base, SYSCTL,
593                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
594 
595         /* Wait till the ICS bit is set */
596         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
597         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
598                 && time_before(jiffies, timeout))
599                 cpu_relax();
600 
601         /*
602          * Enable High-Speed Support
603          * Pre-Requisites
604          *      - Controller should support High-Speed-Enable Bit
605          *      - Controller should not be using DDR Mode
606          *      - Controller should advertise that it supports High Speed
607          *        in capabilities register
608          *      - MMC/SD clock coming out of controller > 25MHz
609          */
610         if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) &&
611             (ios->timing != MMC_TIMING_MMC_DDR52) &&
612             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
613                 regval = OMAP_HSMMC_READ(host->base, HCTL);
614                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
615                         regval |= HSPE;
616                 else
617                         regval &= ~HSPE;
618 
619                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
620         }
621 
622         omap_hsmmc_start_clock(host);
623 }
624 
625 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
626 {
627         struct mmc_ios *ios = &host->mmc->ios;
628         u32 con;
629 
630         con = OMAP_HSMMC_READ(host->base, CON);
631         if (ios->timing == MMC_TIMING_MMC_DDR52)
632                 con |= DDR;     /* configure in DDR mode */
633         else
634                 con &= ~DDR;
635         switch (ios->bus_width) {
636         case MMC_BUS_WIDTH_8:
637                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
638                 break;
639         case MMC_BUS_WIDTH_4:
640                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
641                 OMAP_HSMMC_WRITE(host->base, HCTL,
642                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
643                 break;
644         case MMC_BUS_WIDTH_1:
645                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
646                 OMAP_HSMMC_WRITE(host->base, HCTL,
647                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
648                 break;
649         }
650 }
651 
652 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
653 {
654         struct mmc_ios *ios = &host->mmc->ios;
655         u32 con;
656 
657         con = OMAP_HSMMC_READ(host->base, CON);
658         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
659                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
660         else
661                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
662 }
663 
664 #ifdef CONFIG_PM
665 
666 /*
667  * Restore the MMC host context, if it was lost as result of a
668  * power state change.
669  */
670 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
671 {
672         struct mmc_ios *ios = &host->mmc->ios;
673         u32 hctl, capa;
674         unsigned long timeout;
675 
676         if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
677             host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
678             host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
679             host->capa == OMAP_HSMMC_READ(host->base, CAPA))
680                 return 0;
681 
682         host->context_loss++;
683 
684         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
685                 if (host->power_mode != MMC_POWER_OFF &&
686                     (1 << ios->vdd) <= MMC_VDD_23_24)
687                         hctl = SDVS18;
688                 else
689                         hctl = SDVS30;
690                 capa = VS30 | VS18;
691         } else {
692                 hctl = SDVS18;
693                 capa = VS18;
694         }
695 
696         if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
697                 hctl |= IWE;
698 
699         OMAP_HSMMC_WRITE(host->base, HCTL,
700                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
701 
702         OMAP_HSMMC_WRITE(host->base, CAPA,
703                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
704 
705         OMAP_HSMMC_WRITE(host->base, HCTL,
706                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
707 
708         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
709         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
710                 && time_before(jiffies, timeout))
711                 ;
712 
713         OMAP_HSMMC_WRITE(host->base, ISE, 0);
714         OMAP_HSMMC_WRITE(host->base, IE, 0);
715         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
716 
717         /* Do not initialize card-specific things if the power is off */
718         if (host->power_mode == MMC_POWER_OFF)
719                 goto out;
720 
721         omap_hsmmc_set_bus_width(host);
722 
723         omap_hsmmc_set_clock(host);
724 
725         omap_hsmmc_set_bus_mode(host);
726 
727 out:
728         dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
729                 host->context_loss);
730         return 0;
731 }
732 
733 /*
734  * Save the MMC host context (store the number of power state changes so far).
735  */
736 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
737 {
738         host->con =  OMAP_HSMMC_READ(host->base, CON);
739         host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
740         host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
741         host->capa = OMAP_HSMMC_READ(host->base, CAPA);
742 }
743 
744 #else
745 
746 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
747 {
748         return 0;
749 }
750 
751 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
752 {
753 }
754 
755 #endif
756 
757 /*
758  * Send init stream sequence to card
759  * before sending IDLE command
760  */
761 static void send_init_stream(struct omap_hsmmc_host *host)
762 {
763         int reg = 0;
764         unsigned long timeout;
765 
766         if (host->protect_card)
767                 return;
768 
769         disable_irq(host->irq);
770 
771         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
772         OMAP_HSMMC_WRITE(host->base, CON,
773                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
774         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
775 
776         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
777         while ((reg != CC_EN) && time_before(jiffies, timeout))
778                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
779 
780         OMAP_HSMMC_WRITE(host->base, CON,
781                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
782 
783         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
784         OMAP_HSMMC_READ(host->base, STAT);
785 
786         enable_irq(host->irq);
787 }
788 
789 static inline
790 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
791 {
792         int r = 1;
793 
794         if (mmc_slot(host).get_cover_state)
795                 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
796         return r;
797 }
798 
799 static ssize_t
800 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
801                            char *buf)
802 {
803         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
804         struct omap_hsmmc_host *host = mmc_priv(mmc);
805 
806         return sprintf(buf, "%s\n",
807                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
808 }
809 
810 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
811 
812 static ssize_t
813 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
814                         char *buf)
815 {
816         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
817         struct omap_hsmmc_host *host = mmc_priv(mmc);
818 
819         return sprintf(buf, "%s\n", mmc_slot(host).name);
820 }
821 
822 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
823 
824 /*
825  * Configure the response type and send the cmd.
826  */
827 static void
828 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
829         struct mmc_data *data)
830 {
831         int cmdreg = 0, resptype = 0, cmdtype = 0;
832 
833         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
834                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
835         host->cmd = cmd;
836 
837         omap_hsmmc_enable_irq(host, cmd);
838 
839         host->response_busy = 0;
840         if (cmd->flags & MMC_RSP_PRESENT) {
841                 if (cmd->flags & MMC_RSP_136)
842                         resptype = 1;
843                 else if (cmd->flags & MMC_RSP_BUSY) {
844                         resptype = 3;
845                         host->response_busy = 1;
846                 } else
847                         resptype = 2;
848         }
849 
850         /*
851          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
852          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
853          * a val of 0x3, rest 0x0.
854          */
855         if (cmd == host->mrq->stop)
856                 cmdtype = 0x3;
857 
858         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
859 
860         if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
861             host->mrq->sbc) {
862                 cmdreg |= ACEN_ACMD23;
863                 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
864         }
865         if (data) {
866                 cmdreg |= DP_SELECT | MSBS | BCE;
867                 if (data->flags & MMC_DATA_READ)
868                         cmdreg |= DDIR;
869                 else
870                         cmdreg &= ~(DDIR);
871         }
872 
873         if (host->use_dma)
874                 cmdreg |= DMAE;
875 
876         host->req_in_progress = 1;
877 
878         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
879         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
880 }
881 
882 static int
883 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
884 {
885         if (data->flags & MMC_DATA_WRITE)
886                 return DMA_TO_DEVICE;
887         else
888                 return DMA_FROM_DEVICE;
889 }
890 
891 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
892         struct mmc_data *data)
893 {
894         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
895 }
896 
897 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
898 {
899         int dma_ch;
900         unsigned long flags;
901 
902         spin_lock_irqsave(&host->irq_lock, flags);
903         host->req_in_progress = 0;
904         dma_ch = host->dma_ch;
905         spin_unlock_irqrestore(&host->irq_lock, flags);
906 
907         omap_hsmmc_disable_irq(host);
908         /* Do not complete the request if DMA is still in progress */
909         if (mrq->data && host->use_dma && dma_ch != -1)
910                 return;
911         host->mrq = NULL;
912         mmc_request_done(host->mmc, mrq);
913 }
914 
915 /*
916  * Notify the transfer complete to MMC core
917  */
918 static void
919 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
920 {
921         if (!data) {
922                 struct mmc_request *mrq = host->mrq;
923 
924                 /* TC before CC from CMD6 - don't know why, but it happens */
925                 if (host->cmd && host->cmd->opcode == 6 &&
926                     host->response_busy) {
927                         host->response_busy = 0;
928                         return;
929                 }
930 
931                 omap_hsmmc_request_done(host, mrq);
932                 return;
933         }
934 
935         host->data = NULL;
936 
937         if (!data->error)
938                 data->bytes_xfered += data->blocks * (data->blksz);
939         else
940                 data->bytes_xfered = 0;
941 
942         if (data->stop && (data->error || !host->mrq->sbc))
943                 omap_hsmmc_start_command(host, data->stop, NULL);
944         else
945                 omap_hsmmc_request_done(host, data->mrq);
946 }
947 
948 /*
949  * Notify the core about command completion
950  */
951 static void
952 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
953 {
954         if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
955             !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
956                 host->cmd = NULL;
957                 omap_hsmmc_start_dma_transfer(host);
958                 omap_hsmmc_start_command(host, host->mrq->cmd,
959                                                 host->mrq->data);
960                 return;
961         }
962 
963         host->cmd = NULL;
964 
965         if (cmd->flags & MMC_RSP_PRESENT) {
966                 if (cmd->flags & MMC_RSP_136) {
967                         /* response type 2 */
968                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
969                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
970                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
971                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
972                 } else {
973                         /* response types 1, 1b, 3, 4, 5, 6 */
974                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
975                 }
976         }
977         if ((host->data == NULL && !host->response_busy) || cmd->error)
978                 omap_hsmmc_request_done(host, host->mrq);
979 }
980 
981 /*
982  * DMA clean up for command errors
983  */
984 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
985 {
986         int dma_ch;
987         unsigned long flags;
988 
989         host->data->error = errno;
990 
991         spin_lock_irqsave(&host->irq_lock, flags);
992         dma_ch = host->dma_ch;
993         host->dma_ch = -1;
994         spin_unlock_irqrestore(&host->irq_lock, flags);
995 
996         if (host->use_dma && dma_ch != -1) {
997                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
998 
999                 dmaengine_terminate_all(chan);
1000                 dma_unmap_sg(chan->device->dev,
1001                         host->data->sg, host->data->sg_len,
1002                         omap_hsmmc_get_dma_dir(host, host->data));
1003 
1004                 host->data->host_cookie = 0;
1005         }
1006         host->data = NULL;
1007 }
1008 
1009 /*
1010  * Readable error output
1011  */
1012 #ifdef CONFIG_MMC_DEBUG
1013 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
1014 {
1015         /* --- means reserved bit without definition at documentation */
1016         static const char *omap_hsmmc_status_bits[] = {
1017                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
1018                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
1019                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
1020                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
1021         };
1022         char res[256];
1023         char *buf = res;
1024         int len, i;
1025 
1026         len = sprintf(buf, "MMC IRQ 0x%x :", status);
1027         buf += len;
1028 
1029         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
1030                 if (status & (1 << i)) {
1031                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1032                         buf += len;
1033                 }
1034 
1035         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
1036 }
1037 #else
1038 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1039                                              u32 status)
1040 {
1041 }
1042 #endif  /* CONFIG_MMC_DEBUG */
1043 
1044 /*
1045  * MMC controller internal state machines reset
1046  *
1047  * Used to reset command or data internal state machines, using respectively
1048  *  SRC or SRD bit of SYSCTL register
1049  * Can be called from interrupt context
1050  */
1051 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1052                                                    unsigned long bit)
1053 {
1054         unsigned long i = 0;
1055         unsigned long limit = MMC_TIMEOUT_US;
1056 
1057         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1058                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1059 
1060         /*
1061          * OMAP4 ES2 and greater has an updated reset logic.
1062          * Monitor a 0->1 transition first
1063          */
1064         if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
1065                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1066                                         && (i++ < limit))
1067                         udelay(1);
1068         }
1069         i = 0;
1070 
1071         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1072                 (i++ < limit))
1073                 udelay(1);
1074 
1075         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1076                 dev_err(mmc_dev(host->mmc),
1077                         "Timeout waiting on controller reset in %s\n",
1078                         __func__);
1079 }
1080 
1081 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1082                                         int err, int end_cmd)
1083 {
1084         if (end_cmd) {
1085                 omap_hsmmc_reset_controller_fsm(host, SRC);
1086                 if (host->cmd)
1087                         host->cmd->error = err;
1088         }
1089 
1090         if (host->data) {
1091                 omap_hsmmc_reset_controller_fsm(host, SRD);
1092                 omap_hsmmc_dma_cleanup(host, err);
1093         } else if (host->mrq && host->mrq->cmd)
1094                 host->mrq->cmd->error = err;
1095 }
1096 
1097 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1098 {
1099         struct mmc_data *data;
1100         int end_cmd = 0, end_trans = 0;
1101         int error = 0;
1102 
1103         data = host->data;
1104         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1105 
1106         if (status & ERR_EN) {
1107                 omap_hsmmc_dbg_report_irq(host, status);
1108 
1109                 if (status & (CTO_EN | CCRC_EN))
1110                         end_cmd = 1;
1111                 if (status & (CTO_EN | DTO_EN))
1112                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1113                 else if (status & (CCRC_EN | DCRC_EN))
1114                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1115 
1116                 if (status & ACE_EN) {
1117                         u32 ac12;
1118                         ac12 = OMAP_HSMMC_READ(host->base, AC12);
1119                         if (!(ac12 & ACNE) && host->mrq->sbc) {
1120                                 end_cmd = 1;
1121                                 if (ac12 & ACTO)
1122                                         error =  -ETIMEDOUT;
1123                                 else if (ac12 & (ACCE | ACEB | ACIE))
1124                                         error = -EILSEQ;
1125                                 host->mrq->sbc->error = error;
1126                                 hsmmc_command_incomplete(host, error, end_cmd);
1127                         }
1128                         dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
1129                 }
1130                 if (host->data || host->response_busy) {
1131                         end_trans = !end_cmd;
1132                         host->response_busy = 0;
1133                 }
1134         }
1135 
1136         OMAP_HSMMC_WRITE(host->base, STAT, status);
1137         if (end_cmd || ((status & CC_EN) && host->cmd))
1138                 omap_hsmmc_cmd_done(host, host->cmd);
1139         if ((end_trans || (status & TC_EN)) && host->mrq)
1140                 omap_hsmmc_xfer_done(host, data);
1141 }
1142 
1143 /*
1144  * MMC controller IRQ handler
1145  */
1146 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1147 {
1148         struct omap_hsmmc_host *host = dev_id;
1149         int status;
1150 
1151         status = OMAP_HSMMC_READ(host->base, STAT);
1152         while (status & (INT_EN_MASK | CIRQ_EN)) {
1153                 if (host->req_in_progress)
1154                         omap_hsmmc_do_irq(host, status);
1155 
1156                 if (status & CIRQ_EN)
1157                         mmc_signal_sdio_irq(host->mmc);
1158 
1159                 /* Flush posted write */
1160                 status = OMAP_HSMMC_READ(host->base, STAT);
1161         }
1162 
1163         return IRQ_HANDLED;
1164 }
1165 
1166 static irqreturn_t omap_hsmmc_wake_irq(int irq, void *dev_id)
1167 {
1168         struct omap_hsmmc_host *host = dev_id;
1169 
1170         /* cirq is level triggered, disable to avoid infinite loop */
1171         spin_lock(&host->irq_lock);
1172         if (host->flags & HSMMC_WAKE_IRQ_ENABLED) {
1173                 disable_irq_nosync(host->wake_irq);
1174                 host->flags &= ~HSMMC_WAKE_IRQ_ENABLED;
1175         }
1176         spin_unlock(&host->irq_lock);
1177         pm_request_resume(host->dev); /* no use counter */
1178 
1179         return IRQ_HANDLED;
1180 }
1181 
1182 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1183 {
1184         unsigned long i;
1185 
1186         OMAP_HSMMC_WRITE(host->base, HCTL,
1187                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1188         for (i = 0; i < loops_per_jiffy; i++) {
1189                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1190                         break;
1191                 cpu_relax();
1192         }
1193 }
1194 
1195 /*
1196  * Switch MMC interface voltage ... only relevant for MMC1.
1197  *
1198  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1199  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1200  * Some chips, like eMMC ones, use internal transceivers.
1201  */
1202 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1203 {
1204         u32 reg_val = 0;
1205         int ret;
1206 
1207         /* Disable the clocks */
1208         pm_runtime_put_sync(host->dev);
1209         if (host->dbclk)
1210                 clk_disable_unprepare(host->dbclk);
1211 
1212         /* Turn the power off */
1213         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1214 
1215         /* Turn the power ON with given VDD 1.8 or 3.0v */
1216         if (!ret)
1217                 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1218                                                vdd);
1219         pm_runtime_get_sync(host->dev);
1220         if (host->dbclk)
1221                 clk_prepare_enable(host->dbclk);
1222 
1223         if (ret != 0)
1224                 goto err;
1225 
1226         OMAP_HSMMC_WRITE(host->base, HCTL,
1227                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1228         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1229 
1230         /*
1231          * If a MMC dual voltage card is detected, the set_ios fn calls
1232          * this fn with VDD bit set for 1.8V. Upon card removal from the
1233          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1234          *
1235          * Cope with a bit of slop in the range ... per data sheets:
1236          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1237          *    but recommended values are 1.71V to 1.89V
1238          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1239          *    but recommended values are 2.7V to 3.3V
1240          *
1241          * Board setup code shouldn't permit anything very out-of-range.
1242          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1243          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1244          */
1245         if ((1 << vdd) <= MMC_VDD_23_24)
1246                 reg_val |= SDVS18;
1247         else
1248                 reg_val |= SDVS30;
1249 
1250         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1251         set_sd_bus_power(host);
1252 
1253         return 0;
1254 err:
1255         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1256         return ret;
1257 }
1258 
1259 /* Protect the card while the cover is open */
1260 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1261 {
1262         if (!mmc_slot(host).get_cover_state)
1263                 return;
1264 
1265         host->reqs_blocked = 0;
1266         if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1267                 if (host->protect_card) {
1268                         dev_info(host->dev, "%s: cover is closed, "
1269                                          "card is now accessible\n",
1270                                          mmc_hostname(host->mmc));
1271                         host->protect_card = 0;
1272                 }
1273         } else {
1274                 if (!host->protect_card) {
1275                         dev_info(host->dev, "%s: cover is open, "
1276                                          "card is now inaccessible\n",
1277                                          mmc_hostname(host->mmc));
1278                         host->protect_card = 1;
1279                 }
1280         }
1281 }
1282 
1283 /*
1284  * irq handler to notify the core about card insertion/removal
1285  */
1286 static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
1287 {
1288         struct omap_hsmmc_host *host = dev_id;
1289         struct omap_mmc_slot_data *slot = &mmc_slot(host);
1290         int carddetect;
1291 
1292         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1293 
1294         if (slot->card_detect)
1295                 carddetect = slot->card_detect(host->dev, host->slot_id);
1296         else {
1297                 omap_hsmmc_protect_card(host);
1298                 carddetect = -ENOSYS;
1299         }
1300 
1301         if (carddetect)
1302                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1303         else
1304                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1305         return IRQ_HANDLED;
1306 }
1307 
1308 static void omap_hsmmc_dma_callback(void *param)
1309 {
1310         struct omap_hsmmc_host *host = param;
1311         struct dma_chan *chan;
1312         struct mmc_data *data;
1313         int req_in_progress;
1314 
1315         spin_lock_irq(&host->irq_lock);
1316         if (host->dma_ch < 0) {
1317                 spin_unlock_irq(&host->irq_lock);
1318                 return;
1319         }
1320 
1321         data = host->mrq->data;
1322         chan = omap_hsmmc_get_dma_chan(host, data);
1323         if (!data->host_cookie)
1324                 dma_unmap_sg(chan->device->dev,
1325                              data->sg, data->sg_len,
1326                              omap_hsmmc_get_dma_dir(host, data));
1327 
1328         req_in_progress = host->req_in_progress;
1329         host->dma_ch = -1;
1330         spin_unlock_irq(&host->irq_lock);
1331 
1332         /* If DMA has finished after TC, complete the request */
1333         if (!req_in_progress) {
1334                 struct mmc_request *mrq = host->mrq;
1335 
1336                 host->mrq = NULL;
1337                 mmc_request_done(host->mmc, mrq);
1338         }
1339 }
1340 
1341 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1342                                        struct mmc_data *data,
1343                                        struct omap_hsmmc_next *next,
1344                                        struct dma_chan *chan)
1345 {
1346         int dma_len;
1347 
1348         if (!next && data->host_cookie &&
1349             data->host_cookie != host->next_data.cookie) {
1350                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1351                        " host->next_data.cookie %d\n",
1352                        __func__, data->host_cookie, host->next_data.cookie);
1353                 data->host_cookie = 0;
1354         }
1355 
1356         /* Check if next job is already prepared */
1357         if (next || data->host_cookie != host->next_data.cookie) {
1358                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1359                                      omap_hsmmc_get_dma_dir(host, data));
1360 
1361         } else {
1362                 dma_len = host->next_data.dma_len;
1363                 host->next_data.dma_len = 0;
1364         }
1365 
1366 
1367         if (dma_len == 0)
1368                 return -EINVAL;
1369 
1370         if (next) {
1371                 next->dma_len = dma_len;
1372                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1373         } else
1374                 host->dma_len = dma_len;
1375 
1376         return 0;
1377 }
1378 
1379 /*
1380  * Routine to configure and start DMA for the MMC card
1381  */
1382 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
1383                                         struct mmc_request *req)
1384 {
1385         struct dma_slave_config cfg;
1386         struct dma_async_tx_descriptor *tx;
1387         int ret = 0, i;
1388         struct mmc_data *data = req->data;
1389         struct dma_chan *chan;
1390 
1391         /* Sanity check: all the SG entries must be aligned by block size. */
1392         for (i = 0; i < data->sg_len; i++) {
1393                 struct scatterlist *sgl;
1394 
1395                 sgl = data->sg + i;
1396                 if (sgl->length % data->blksz)
1397                         return -EINVAL;
1398         }
1399         if ((data->blksz % 4) != 0)
1400                 /* REVISIT: The MMC buffer increments only when MSB is written.
1401                  * Return error for blksz which is non multiple of four.
1402                  */
1403                 return -EINVAL;
1404 
1405         BUG_ON(host->dma_ch != -1);
1406 
1407         chan = omap_hsmmc_get_dma_chan(host, data);
1408 
1409         cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
1410         cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
1411         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1412         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1413         cfg.src_maxburst = data->blksz / 4;
1414         cfg.dst_maxburst = data->blksz / 4;
1415 
1416         ret = dmaengine_slave_config(chan, &cfg);
1417         if (ret)
1418                 return ret;
1419 
1420         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1421         if (ret)
1422                 return ret;
1423 
1424         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1425                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1426                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1427         if (!tx) {
1428                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1429                 /* FIXME: cleanup */
1430                 return -1;
1431         }
1432 
1433         tx->callback = omap_hsmmc_dma_callback;
1434         tx->callback_param = host;
1435 
1436         /* Does not fail */
1437         dmaengine_submit(tx);
1438 
1439         host->dma_ch = 1;
1440 
1441         return 0;
1442 }
1443 
1444 static void set_data_timeout(struct omap_hsmmc_host *host,
1445                              unsigned int timeout_ns,
1446                              unsigned int timeout_clks)
1447 {
1448         unsigned int timeout, cycle_ns;
1449         uint32_t reg, clkd, dto = 0;
1450 
1451         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1452         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1453         if (clkd == 0)
1454                 clkd = 1;
1455 
1456         cycle_ns = 1000000000 / (host->clk_rate / clkd);
1457         timeout = timeout_ns / cycle_ns;
1458         timeout += timeout_clks;
1459         if (timeout) {
1460                 while ((timeout & 0x80000000) == 0) {
1461                         dto += 1;
1462                         timeout <<= 1;
1463                 }
1464                 dto = 31 - dto;
1465                 timeout <<= 1;
1466                 if (timeout && dto)
1467                         dto += 1;
1468                 if (dto >= 13)
1469                         dto -= 13;
1470                 else
1471                         dto = 0;
1472                 if (dto > 14)
1473                         dto = 14;
1474         }
1475 
1476         reg &= ~DTO_MASK;
1477         reg |= dto << DTO_SHIFT;
1478         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1479 }
1480 
1481 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
1482 {
1483         struct mmc_request *req = host->mrq;
1484         struct dma_chan *chan;
1485 
1486         if (!req->data)
1487                 return;
1488         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1489                                 | (req->data->blocks << 16));
1490         set_data_timeout(host, req->data->timeout_ns,
1491                                 req->data->timeout_clks);
1492         chan = omap_hsmmc_get_dma_chan(host, req->data);
1493         dma_async_issue_pending(chan);
1494 }
1495 
1496 /*
1497  * Configure block length for MMC/SD cards and initiate the transfer.
1498  */
1499 static int
1500 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1501 {
1502         int ret;
1503         host->data = req->data;
1504 
1505         if (req->data == NULL) {
1506                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1507                 /*
1508                  * Set an arbitrary 100ms data timeout for commands with
1509                  * busy signal.
1510                  */
1511                 if (req->cmd->flags & MMC_RSP_BUSY)
1512                         set_data_timeout(host, 100000000U, 0);
1513                 return 0;
1514         }
1515 
1516         if (host->use_dma) {
1517                 ret = omap_hsmmc_setup_dma_transfer(host, req);
1518                 if (ret != 0) {
1519                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1520                         return ret;
1521                 }
1522         }
1523         return 0;
1524 }
1525 
1526 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1527                                 int err)
1528 {
1529         struct omap_hsmmc_host *host = mmc_priv(mmc);
1530         struct mmc_data *data = mrq->data;
1531 
1532         if (host->use_dma && data->host_cookie) {
1533                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1534 
1535                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1536                              omap_hsmmc_get_dma_dir(host, data));
1537                 data->host_cookie = 0;
1538         }
1539 }
1540 
1541 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1542                                bool is_first_req)
1543 {
1544         struct omap_hsmmc_host *host = mmc_priv(mmc);
1545 
1546         if (mrq->data->host_cookie) {
1547                 mrq->data->host_cookie = 0;
1548                 return ;
1549         }
1550 
1551         if (host->use_dma) {
1552                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1553 
1554                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1555                                                 &host->next_data, c))
1556                         mrq->data->host_cookie = 0;
1557         }
1558 }
1559 
1560 /*
1561  * Request function. for read/write operation
1562  */
1563 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1564 {
1565         struct omap_hsmmc_host *host = mmc_priv(mmc);
1566         int err;
1567 
1568         BUG_ON(host->req_in_progress);
1569         BUG_ON(host->dma_ch != -1);
1570         if (host->protect_card) {
1571                 if (host->reqs_blocked < 3) {
1572                         /*
1573                          * Ensure the controller is left in a consistent
1574                          * state by resetting the command and data state
1575                          * machines.
1576                          */
1577                         omap_hsmmc_reset_controller_fsm(host, SRD);
1578                         omap_hsmmc_reset_controller_fsm(host, SRC);
1579                         host->reqs_blocked += 1;
1580                 }
1581                 req->cmd->error = -EBADF;
1582                 if (req->data)
1583                         req->data->error = -EBADF;
1584                 req->cmd->retries = 0;
1585                 mmc_request_done(mmc, req);
1586                 return;
1587         } else if (host->reqs_blocked)
1588                 host->reqs_blocked = 0;
1589         WARN_ON(host->mrq != NULL);
1590         host->mrq = req;
1591         host->clk_rate = clk_get_rate(host->fclk);
1592         err = omap_hsmmc_prepare_data(host, req);
1593         if (err) {
1594                 req->cmd->error = err;
1595                 if (req->data)
1596                         req->data->error = err;
1597                 host->mrq = NULL;
1598                 mmc_request_done(mmc, req);
1599                 return;
1600         }
1601         if (req->sbc && !(host->flags & AUTO_CMD23)) {
1602                 omap_hsmmc_start_command(host, req->sbc, NULL);
1603                 return;
1604         }
1605 
1606         omap_hsmmc_start_dma_transfer(host);
1607         omap_hsmmc_start_command(host, req->cmd, req->data);
1608 }
1609 
1610 /* Routine to configure clock values. Exposed API to core */
1611 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1612 {
1613         struct omap_hsmmc_host *host = mmc_priv(mmc);
1614         int do_send_init_stream = 0;
1615 
1616         pm_runtime_get_sync(host->dev);
1617 
1618         if (ios->power_mode != host->power_mode) {
1619                 switch (ios->power_mode) {
1620                 case MMC_POWER_OFF:
1621                         mmc_slot(host).set_power(host->dev, host->slot_id,
1622                                                  0, 0);
1623                         break;
1624                 case MMC_POWER_UP:
1625                         mmc_slot(host).set_power(host->dev, host->slot_id,
1626                                                  1, ios->vdd);
1627                         break;
1628                 case MMC_POWER_ON:
1629                         do_send_init_stream = 1;
1630                         break;
1631                 }
1632                 host->power_mode = ios->power_mode;
1633         }
1634 
1635         /* FIXME: set registers based only on changes to ios */
1636 
1637         omap_hsmmc_set_bus_width(host);
1638 
1639         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1640                 /* Only MMC1 can interface at 3V without some flavor
1641                  * of external transceiver; but they all handle 1.8V.
1642                  */
1643                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1644                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1645                                 /*
1646                                  * The mmc_select_voltage fn of the core does
1647                                  * not seem to set the power_mode to
1648                                  * MMC_POWER_UP upon recalculating the voltage.
1649                                  * vdd 1.8v.
1650                                  */
1651                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1652                                 dev_dbg(mmc_dev(host->mmc),
1653                                                 "Switch operation failed\n");
1654                 }
1655         }
1656 
1657         omap_hsmmc_set_clock(host);
1658 
1659         if (do_send_init_stream)
1660                 send_init_stream(host);
1661 
1662         omap_hsmmc_set_bus_mode(host);
1663 
1664         pm_runtime_put_autosuspend(host->dev);
1665 }
1666 
1667 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1668 {
1669         struct omap_hsmmc_host *host = mmc_priv(mmc);
1670 
1671         if (!mmc_slot(host).card_detect)
1672                 return -ENOSYS;
1673         return mmc_slot(host).card_detect(host->dev, host->slot_id);
1674 }
1675 
1676 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1677 {
1678         struct omap_hsmmc_host *host = mmc_priv(mmc);
1679 
1680         if (!mmc_slot(host).get_ro)
1681                 return -ENOSYS;
1682         return mmc_slot(host).get_ro(host->dev, 0);
1683 }
1684 
1685 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1686 {
1687         struct omap_hsmmc_host *host = mmc_priv(mmc);
1688 
1689         if (mmc_slot(host).init_card)
1690                 mmc_slot(host).init_card(card);
1691 }
1692 
1693 static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1694 {
1695         struct omap_hsmmc_host *host = mmc_priv(mmc);
1696         u32 irq_mask, con;
1697         unsigned long flags;
1698 
1699         spin_lock_irqsave(&host->irq_lock, flags);
1700 
1701         con = OMAP_HSMMC_READ(host->base, CON);
1702         irq_mask = OMAP_HSMMC_READ(host->base, ISE);
1703         if (enable) {
1704                 host->flags |= HSMMC_SDIO_IRQ_ENABLED;
1705                 irq_mask |= CIRQ_EN;
1706                 con |= CTPL | CLKEXTFREE;
1707         } else {
1708                 host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
1709                 irq_mask &= ~CIRQ_EN;
1710                 con &= ~(CTPL | CLKEXTFREE);
1711         }
1712         OMAP_HSMMC_WRITE(host->base, CON, con);
1713         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
1714 
1715         /*
1716          * if enable, piggy back detection on current request
1717          * but always disable immediately
1718          */
1719         if (!host->req_in_progress || !enable)
1720                 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
1721 
1722         /* flush posted write */
1723         OMAP_HSMMC_READ(host->base, IE);
1724 
1725         spin_unlock_irqrestore(&host->irq_lock, flags);
1726 }
1727 
1728 static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
1729 {
1730         struct mmc_host *mmc = host->mmc;
1731         int ret;
1732 
1733         /*
1734          * For omaps with wake-up path, wakeirq will be irq from pinctrl and
1735          * for other omaps, wakeirq will be from GPIO (dat line remuxed to
1736          * gpio). wakeirq is needed to detect sdio irq in runtime suspend state
1737          * with functional clock disabled.
1738          */
1739         if (!host->dev->of_node || !host->wake_irq)
1740                 return -ENODEV;
1741 
1742         /* Prevent auto-enabling of IRQ */
1743         irq_set_status_flags(host->wake_irq, IRQ_NOAUTOEN);
1744         ret = devm_request_irq(host->dev, host->wake_irq, omap_hsmmc_wake_irq,
1745                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1746                                mmc_hostname(mmc), host);
1747         if (ret) {
1748                 dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n");
1749                 goto err;
1750         }
1751 
1752         /*
1753          * Some omaps don't have wake-up path from deeper idle states
1754          * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
1755          */
1756         if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
1757                 struct pinctrl *p = devm_pinctrl_get(host->dev);
1758                 if (!p) {
1759                         ret = -ENODEV;
1760                         goto err_free_irq;
1761                 }
1762                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {
1763                         dev_info(host->dev, "missing default pinctrl state\n");
1764                         devm_pinctrl_put(p);
1765                         ret = -EINVAL;
1766                         goto err_free_irq;
1767                 }
1768 
1769                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) {
1770                         dev_info(host->dev, "missing idle pinctrl state\n");
1771                         devm_pinctrl_put(p);
1772                         ret = -EINVAL;
1773                         goto err_free_irq;
1774                 }
1775                 devm_pinctrl_put(p);
1776         }
1777 
1778         OMAP_HSMMC_WRITE(host->base, HCTL,
1779                          OMAP_HSMMC_READ(host->base, HCTL) | IWE);
1780         return 0;
1781 
1782 err_free_irq:
1783         devm_free_irq(host->dev, host->wake_irq, host);
1784 err:
1785         dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n");
1786         host->wake_irq = 0;
1787         return ret;
1788 }
1789 
1790 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1791 {
1792         u32 hctl, capa, value;
1793 
1794         /* Only MMC1 supports 3.0V */
1795         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1796                 hctl = SDVS30;
1797                 capa = VS30 | VS18;
1798         } else {
1799                 hctl = SDVS18;
1800                 capa = VS18;
1801         }
1802 
1803         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1804         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1805 
1806         value = OMAP_HSMMC_READ(host->base, CAPA);
1807         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1808 
1809         /* Set SD bus power bit */
1810         set_sd_bus_power(host);
1811 }
1812 
1813 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1814 {
1815         struct omap_hsmmc_host *host = mmc_priv(mmc);
1816 
1817         pm_runtime_get_sync(host->dev);
1818 
1819         return 0;
1820 }
1821 
1822 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
1823 {
1824         struct omap_hsmmc_host *host = mmc_priv(mmc);
1825 
1826         pm_runtime_mark_last_busy(host->dev);
1827         pm_runtime_put_autosuspend(host->dev);
1828 
1829         return 0;
1830 }
1831 
1832 static int omap_hsmmc_multi_io_quirk(struct mmc_card *card,
1833                                      unsigned int direction, int blk_size)
1834 {
1835         /* This controller can't do multiblock reads due to hw bugs */
1836         if (direction == MMC_DATA_READ)
1837                 return 1;
1838 
1839         return blk_size;
1840 }
1841 
1842 static struct mmc_host_ops omap_hsmmc_ops = {
1843         .enable = omap_hsmmc_enable_fclk,
1844         .disable = omap_hsmmc_disable_fclk,
1845         .post_req = omap_hsmmc_post_req,
1846         .pre_req = omap_hsmmc_pre_req,
1847         .request = omap_hsmmc_request,
1848         .set_ios = omap_hsmmc_set_ios,
1849         .get_cd = omap_hsmmc_get_cd,
1850         .get_ro = omap_hsmmc_get_ro,
1851         .init_card = omap_hsmmc_init_card,
1852         .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
1853 };
1854 
1855 #ifdef CONFIG_DEBUG_FS
1856 
1857 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1858 {
1859         struct mmc_host *mmc = s->private;
1860         struct omap_hsmmc_host *host = mmc_priv(mmc);
1861 
1862         seq_printf(s, "mmc%d:\n", mmc->index);
1863         seq_printf(s, "sdio irq mode\t%s\n",
1864                    (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling");
1865 
1866         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1867                 seq_printf(s, "sdio irq \t%s\n",
1868                            (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?  "enabled"
1869                            : "disabled");
1870         }
1871         seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
1872 
1873         pm_runtime_get_sync(host->dev);
1874         seq_puts(s, "\nregs:\n");
1875         seq_printf(s, "CON:\t\t0x%08x\n",
1876                         OMAP_HSMMC_READ(host->base, CON));
1877         seq_printf(s, "PSTATE:\t\t0x%08x\n",
1878                    OMAP_HSMMC_READ(host->base, PSTATE));
1879         seq_printf(s, "HCTL:\t\t0x%08x\n",
1880                         OMAP_HSMMC_READ(host->base, HCTL));
1881         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1882                         OMAP_HSMMC_READ(host->base, SYSCTL));
1883         seq_printf(s, "IE:\t\t0x%08x\n",
1884                         OMAP_HSMMC_READ(host->base, IE));
1885         seq_printf(s, "ISE:\t\t0x%08x\n",
1886                         OMAP_HSMMC_READ(host->base, ISE));
1887         seq_printf(s, "CAPA:\t\t0x%08x\n",
1888                         OMAP_HSMMC_READ(host->base, CAPA));
1889 
1890         pm_runtime_mark_last_busy(host->dev);
1891         pm_runtime_put_autosuspend(host->dev);
1892 
1893         return 0;
1894 }
1895 
1896 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1897 {
1898         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1899 }
1900 
1901 static const struct file_operations mmc_regs_fops = {
1902         .open           = omap_hsmmc_regs_open,
1903         .read           = seq_read,
1904         .llseek         = seq_lseek,
1905         .release        = single_release,
1906 };
1907 
1908 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1909 {
1910         if (mmc->debugfs_root)
1911                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1912                         mmc, &mmc_regs_fops);
1913 }
1914 
1915 #else
1916 
1917 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1918 {
1919 }
1920 
1921 #endif
1922 
1923 #ifdef CONFIG_OF
1924 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
1925         /* See 35xx errata 2.1.1.128 in SPRZ278F */
1926         .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
1927 };
1928 
1929 static const struct omap_mmc_of_data omap4_mmc_of_data = {
1930         .reg_offset = 0x100,
1931 };
1932 static const struct omap_mmc_of_data am33xx_mmc_of_data = {
1933         .reg_offset = 0x100,
1934         .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING,
1935 };
1936 
1937 static const struct of_device_id omap_mmc_of_match[] = {
1938         {
1939                 .compatible = "ti,omap2-hsmmc",
1940         },
1941         {
1942                 .compatible = "ti,omap3-pre-es3-hsmmc",
1943                 .data = &omap3_pre_es3_mmc_of_data,
1944         },
1945         {
1946                 .compatible = "ti,omap3-hsmmc",
1947         },
1948         {
1949                 .compatible = "ti,omap4-hsmmc",
1950                 .data = &omap4_mmc_of_data,
1951         },
1952         {
1953                 .compatible = "ti,am33xx-hsmmc",
1954                 .data = &am33xx_mmc_of_data,
1955         },
1956         {},
1957 };
1958 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1959 
1960 static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1961 {
1962         struct omap_mmc_platform_data *pdata;
1963         struct device_node *np = dev->of_node;
1964         u32 bus_width, max_freq;
1965         int cd_gpio, wp_gpio;
1966 
1967         cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
1968         wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
1969         if (cd_gpio == -EPROBE_DEFER || wp_gpio == -EPROBE_DEFER)
1970                 return ERR_PTR(-EPROBE_DEFER);
1971 
1972         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1973         if (!pdata)
1974                 return ERR_PTR(-ENOMEM); /* out of memory */
1975 
1976         if (of_find_property(np, "ti,dual-volt", NULL))
1977                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1978 
1979         /* This driver only supports 1 slot */
1980         pdata->nr_slots = 1;
1981         pdata->slots[0].switch_pin = cd_gpio;
1982         pdata->slots[0].gpio_wp = wp_gpio;
1983 
1984         if (of_find_property(np, "ti,non-removable", NULL)) {
1985                 pdata->slots[0].nonremovable = true;
1986                 pdata->slots[0].no_regulator_off_init = true;
1987         }
1988         of_property_read_u32(np, "bus-width", &bus_width);
1989         if (bus_width == 4)
1990                 pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
1991         else if (bus_width == 8)
1992                 pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
1993 
1994         if (of_find_property(np, "ti,needs-special-reset", NULL))
1995                 pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
1996 
1997         if (!of_property_read_u32(np, "max-frequency", &max_freq))
1998                 pdata->max_freq = max_freq;
1999 
2000         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
2001                 pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT;
2002 
2003         if (of_find_property(np, "keep-power-in-suspend", NULL))
2004                 pdata->slots[0].pm_caps |= MMC_PM_KEEP_POWER;
2005 
2006         if (of_find_property(np, "enable-sdio-wakeup", NULL))
2007                 pdata->slots[0].pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
2008 
2009         return pdata;
2010 }
2011 #else
2012 static inline struct omap_mmc_platform_data
2013                         *of_get_hsmmc_pdata(struct device *dev)
2014 {
2015         return ERR_PTR(-EINVAL);
2016 }
2017 #endif
2018 
2019 static int omap_hsmmc_probe(struct platform_device *pdev)
2020 {
2021         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
2022         struct mmc_host *mmc;
2023         struct omap_hsmmc_host *host = NULL;
2024         struct resource *res;
2025         int ret, irq;
2026         const struct of_device_id *match;
2027         dma_cap_mask_t mask;
2028         unsigned tx_req, rx_req;
2029         const struct omap_mmc_of_data *data;
2030         void __iomem *base;
2031 
2032         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
2033         if (match) {
2034                 pdata = of_get_hsmmc_pdata(&pdev->dev);
2035 
2036                 if (IS_ERR(pdata))
2037                         return PTR_ERR(pdata);
2038 
2039                 if (match->data) {
2040                         data = match->data;
2041                         pdata->reg_offset = data->reg_offset;
2042                         pdata->controller_flags |= data->controller_flags;
2043                 }
2044         }
2045 
2046         if (pdata == NULL) {
2047                 dev_err(&pdev->dev, "Platform Data is missing\n");
2048                 return -ENXIO;
2049         }
2050 
2051         if (pdata->nr_slots == 0) {
2052                 dev_err(&pdev->dev, "No Slots\n");
2053                 return -ENXIO;
2054         }
2055 
2056         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2057         irq = platform_get_irq(pdev, 0);
2058         if (res == NULL || irq < 0)
2059                 return -ENXIO;
2060 
2061         base = devm_ioremap_resource(&pdev->dev, res);
2062         if (IS_ERR(base))
2063                 return PTR_ERR(base);
2064 
2065         ret = omap_hsmmc_gpio_init(pdata);
2066         if (ret)
2067                 goto err;
2068 
2069         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
2070         if (!mmc) {
2071                 ret = -ENOMEM;
2072                 goto err_alloc;
2073         }
2074 
2075         host            = mmc_priv(mmc);
2076         host->mmc       = mmc;
2077         host->pdata     = pdata;
2078         host->dev       = &pdev->dev;
2079         host->use_dma   = 1;
2080         host->dma_ch    = -1;
2081         host->irq       = irq;
2082         host->slot_id   = 0;
2083         host->mapbase   = res->start + pdata->reg_offset;
2084         host->base      = base + pdata->reg_offset;
2085         host->power_mode = MMC_POWER_OFF;
2086         host->next_data.cookie = 1;
2087         host->pbias_enabled = 0;
2088 
2089         platform_set_drvdata(pdev, host);
2090 
2091         if (pdev->dev.of_node)
2092                 host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
2093 
2094         mmc->ops        = &omap_hsmmc_ops;
2095 
2096         mmc->f_min = OMAP_MMC_MIN_CLOCK;
2097 
2098         if (pdata->max_freq > 0)
2099                 mmc->f_max = pdata->max_freq;
2100         else
2101                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
2102 
2103         spin_lock_init(&host->irq_lock);
2104 
2105         host->fclk = devm_clk_get(&pdev->dev, "fck");
2106         if (IS_ERR(host->fclk)) {
2107                 ret = PTR_ERR(host->fclk);
2108                 host->fclk = NULL;
2109                 goto err1;
2110         }
2111 
2112         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
2113                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
2114                 omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
2115         }
2116 
2117         pm_runtime_enable(host->dev);
2118         pm_runtime_get_sync(host->dev);
2119         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
2120         pm_runtime_use_autosuspend(host->dev);
2121 
2122         omap_hsmmc_context_save(host);
2123 
2124         host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck");
2125         /*
2126          * MMC can still work without debounce clock.
2127          */
2128         if (IS_ERR(host->dbclk)) {
2129                 host->dbclk = NULL;
2130         } else if (clk_prepare_enable(host->dbclk) != 0) {
2131                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
2132                 host->dbclk = NULL;
2133         }
2134 
2135         /* Since we do only SG emulation, we can have as many segs
2136          * as we want. */
2137         mmc->max_segs = 1024;
2138 
2139         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
2140         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
2141         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2142         mmc->max_seg_size = mmc->max_req_size;
2143 
2144         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2145                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2146 
2147         mmc->caps |= mmc_slot(host).caps;
2148         if (mmc->caps & MMC_CAP_8_BIT_DATA)
2149                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2150 
2151         if (mmc_slot(host).nonremovable)
2152                 mmc->caps |= MMC_CAP_NONREMOVABLE;
2153 
2154         mmc->pm_caps = mmc_slot(host).pm_caps;
2155 
2156         omap_hsmmc_conf_bus_power(host);
2157 
2158         if (!pdev->dev.of_node) {
2159                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
2160                 if (!res) {
2161                         dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
2162                         ret = -ENXIO;
2163                         goto err_irq;
2164                 }
2165                 tx_req = res->start;
2166 
2167                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
2168                 if (!res) {
2169                         dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
2170                         ret = -ENXIO;
2171                         goto err_irq;
2172                 }
2173                 rx_req = res->start;
2174         }
2175 
2176         dma_cap_zero(mask);
2177         dma_cap_set(DMA_SLAVE, mask);
2178 
2179         host->rx_chan =
2180                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2181                                                  &rx_req, &pdev->dev, "rx");
2182 
2183         if (!host->rx_chan) {
2184                 dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
2185                 ret = -ENXIO;
2186                 goto err_irq;
2187         }
2188 
2189         host->tx_chan =
2190                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2191                                                  &tx_req, &pdev->dev, "tx");
2192 
2193         if (!host->tx_chan) {
2194                 dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
2195                 ret = -ENXIO;
2196                 goto err_irq;
2197         }
2198 
2199         /* Request IRQ for MMC operations */
2200         ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
2201                         mmc_hostname(mmc), host);
2202         if (ret) {
2203                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2204                 goto err_irq;
2205         }
2206 
2207         if (pdata->init != NULL) {
2208                 if (pdata->init(&pdev->dev) != 0) {
2209                         dev_err(mmc_dev(host->mmc),
2210                                 "Unable to configure MMC IRQs\n");
2211                         goto err_irq;
2212                 }
2213         }
2214 
2215         if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2216                 ret = omap_hsmmc_reg_get(host);
2217                 if (ret)
2218                         goto err_reg;
2219                 host->use_reg = 1;
2220         }
2221 
2222         mmc->ocr_avail = mmc_slot(host).ocr_mask;
2223 
2224         /* Request IRQ for card detect */
2225         if ((mmc_slot(host).card_detect_irq)) {
2226                 ret = devm_request_threaded_irq(&pdev->dev,
2227                                                 mmc_slot(host).card_detect_irq,
2228                                                 NULL, omap_hsmmc_detect,
2229                                            IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
2230                                            mmc_hostname(mmc), host);
2231                 if (ret) {
2232                         dev_err(mmc_dev(host->mmc),
2233                                 "Unable to grab MMC CD IRQ\n");
2234                         goto err_irq_cd;
2235                 }
2236                 pdata->suspend = omap_hsmmc_suspend_cdirq;
2237                 pdata->resume = omap_hsmmc_resume_cdirq;
2238         }
2239 
2240         omap_hsmmc_disable_irq(host);
2241 
2242         /*
2243          * For now, only support SDIO interrupt if we have a separate
2244          * wake-up interrupt configured from device tree. This is because
2245          * the wake-up interrupt is needed for idle state and some
2246          * platforms need special quirks. And we don't want to add new
2247          * legacy mux platform init code callbacks any longer as we
2248          * are moving to DT based booting anyways.
2249          */
2250         ret = omap_hsmmc_configure_wake_irq(host);
2251         if (!ret)
2252                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2253 
2254         omap_hsmmc_protect_card(host);
2255 
2256         mmc_add_host(mmc);
2257 
2258         if (mmc_slot(host).name != NULL) {
2259                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2260                 if (ret < 0)
2261                         goto err_slot_name;
2262         }
2263         if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2264                 ret = device_create_file(&mmc->class_dev,
2265                                         &dev_attr_cover_switch);
2266                 if (ret < 0)
2267                         goto err_slot_name;
2268         }
2269 
2270         omap_hsmmc_debugfs(mmc);
2271         pm_runtime_mark_last_busy(host->dev);
2272         pm_runtime_put_autosuspend(host->dev);
2273 
2274         return 0;
2275 
2276 err_slot_name:
2277         mmc_remove_host(mmc);
2278 err_irq_cd:
2279         if (host->use_reg)
2280                 omap_hsmmc_reg_put(host);
2281 err_reg:
2282         if (host->pdata->cleanup)
2283                 host->pdata->cleanup(&pdev->dev);
2284 err_irq:
2285         if (host->tx_chan)
2286                 dma_release_channel(host->tx_chan);
2287         if (host->rx_chan)
2288                 dma_release_channel(host->rx_chan);
2289         pm_runtime_put_sync(host->dev);
2290         pm_runtime_disable(host->dev);
2291         if (host->dbclk)
2292                 clk_disable_unprepare(host->dbclk);
2293 err1:
2294         mmc_free_host(mmc);
2295 err_alloc:
2296         omap_hsmmc_gpio_free(pdata);
2297 err:
2298         return ret;
2299 }
2300 
2301 static int omap_hsmmc_remove(struct platform_device *pdev)
2302 {
2303         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2304 
2305         pm_runtime_get_sync(host->dev);
2306         mmc_remove_host(host->mmc);
2307         if (host->use_reg)
2308                 omap_hsmmc_reg_put(host);
2309         if (host->pdata->cleanup)
2310                 host->pdata->cleanup(&pdev->dev);
2311 
2312         if (host->tx_chan)
2313                 dma_release_channel(host->tx_chan);
2314         if (host->rx_chan)
2315                 dma_release_channel(host->rx_chan);
2316 
2317         pm_runtime_put_sync(host->dev);
2318         pm_runtime_disable(host->dev);
2319         if (host->dbclk)
2320                 clk_disable_unprepare(host->dbclk);
2321 
2322         omap_hsmmc_gpio_free(host->pdata);
2323         mmc_free_host(host->mmc);
2324 
2325         return 0;
2326 }
2327 
2328 #ifdef CONFIG_PM
2329 static int omap_hsmmc_prepare(struct device *dev)
2330 {
2331         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2332 
2333         if (host->pdata->suspend)
2334                 return host->pdata->suspend(dev, host->slot_id);
2335 
2336         return 0;
2337 }
2338 
2339 static void omap_hsmmc_complete(struct device *dev)
2340 {
2341         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2342 
2343         if (host->pdata->resume)
2344                 host->pdata->resume(dev, host->slot_id);
2345 
2346 }
2347 
2348 static int omap_hsmmc_suspend(struct device *dev)
2349 {
2350         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2351 
2352         if (!host)
2353                 return 0;
2354 
2355         pm_runtime_get_sync(host->dev);
2356 
2357         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2358                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2359                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2360                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2361                 OMAP_HSMMC_WRITE(host->base, HCTL,
2362                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2363         }
2364 
2365         /* do not wake up due to sdio irq */
2366         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2367             !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ))
2368                 disable_irq(host->wake_irq);
2369 
2370         if (host->dbclk)
2371                 clk_disable_unprepare(host->dbclk);
2372 
2373         pm_runtime_put_sync(host->dev);
2374         return 0;
2375 }
2376 
2377 /* Routine to resume the MMC device */
2378 static int omap_hsmmc_resume(struct device *dev)
2379 {
2380         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2381 
2382         if (!host)
2383                 return 0;
2384 
2385         pm_runtime_get_sync(host->dev);
2386 
2387         if (host->dbclk)
2388                 clk_prepare_enable(host->dbclk);
2389 
2390         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2391                 omap_hsmmc_conf_bus_power(host);
2392 
2393         omap_hsmmc_protect_card(host);
2394 
2395         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2396             !(host->mmc->pm_flags & MMC_PM_WAKE_SDIO_IRQ))
2397                 enable_irq(host->wake_irq);
2398 
2399         pm_runtime_mark_last_busy(host->dev);
2400         pm_runtime_put_autosuspend(host->dev);
2401         return 0;
2402 }
2403 
2404 #else
2405 #define omap_hsmmc_prepare      NULL
2406 #define omap_hsmmc_complete     NULL
2407 #define omap_hsmmc_suspend      NULL
2408 #define omap_hsmmc_resume       NULL
2409 #endif
2410 
2411 static int omap_hsmmc_runtime_suspend(struct device *dev)
2412 {
2413         struct omap_hsmmc_host *host;
2414         unsigned long flags;
2415         int ret = 0;
2416 
2417         host = platform_get_drvdata(to_platform_device(dev));
2418         omap_hsmmc_context_save(host);
2419         dev_dbg(dev, "disabled\n");
2420 
2421         spin_lock_irqsave(&host->irq_lock, flags);
2422         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2423             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2424                 /* disable sdio irq handling to prevent race */
2425                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2426                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2427 
2428                 if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) {
2429                         /*
2430                          * dat1 line low, pending sdio irq
2431                          * race condition: possible irq handler running on
2432                          * multi-core, abort
2433                          */
2434                         dev_dbg(dev, "pending sdio irq, abort suspend\n");
2435                         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2436                         OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2437                         OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2438                         pm_runtime_mark_last_busy(dev);
2439                         ret = -EBUSY;
2440                         goto abort;
2441                 }
2442 
2443                 pinctrl_pm_select_idle_state(dev);
2444 
2445                 WARN_ON(host->flags & HSMMC_WAKE_IRQ_ENABLED);
2446                 enable_irq(host->wake_irq);
2447                 host->flags |= HSMMC_WAKE_IRQ_ENABLED;
2448         } else {
2449                 pinctrl_pm_select_idle_state(dev);
2450         }
2451 
2452 abort:
2453         spin_unlock_irqrestore(&host->irq_lock, flags);
2454         return ret;
2455 }
2456 
2457 static int omap_hsmmc_runtime_resume(struct device *dev)
2458 {
2459         struct omap_hsmmc_host *host;
2460         unsigned long flags;
2461 
2462         host = platform_get_drvdata(to_platform_device(dev));
2463         omap_hsmmc_context_restore(host);
2464         dev_dbg(dev, "enabled\n");
2465 
2466         spin_lock_irqsave(&host->irq_lock, flags);
2467         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2468             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2469                 /* sdio irq flag can't change while in runtime suspend */
2470                 if (host->flags & HSMMC_WAKE_IRQ_ENABLED) {
2471                         disable_irq_nosync(host->wake_irq);
2472                         host->flags &= ~HSMMC_WAKE_IRQ_ENABLED;
2473                 }
2474 
2475                 pinctrl_pm_select_default_state(host->dev);
2476 
2477                 /* irq lost, if pinmux incorrect */
2478                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2479                 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2480                 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2481         } else {
2482                 pinctrl_pm_select_default_state(host->dev);
2483         }
2484         spin_unlock_irqrestore(&host->irq_lock, flags);
2485         return 0;
2486 }
2487 
2488 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2489         .suspend        = omap_hsmmc_suspend,
2490         .resume         = omap_hsmmc_resume,
2491         .prepare        = omap_hsmmc_prepare,
2492         .complete       = omap_hsmmc_complete,
2493         .runtime_suspend = omap_hsmmc_runtime_suspend,
2494         .runtime_resume = omap_hsmmc_runtime_resume,
2495 };
2496 
2497 static struct platform_driver omap_hsmmc_driver = {
2498         .probe          = omap_hsmmc_probe,
2499         .remove         = omap_hsmmc_remove,
2500         .driver         = {
2501                 .name = DRIVER_NAME,
2502                 .pm = &omap_hsmmc_dev_pm_ops,
2503                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2504         },
2505 };
2506 
2507 module_platform_driver(omap_hsmmc_driver);
2508 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2509 MODULE_LICENSE("GPL");
2510 MODULE_ALIAS("platform:" DRIVER_NAME);
2511 MODULE_AUTHOR("Texas Instruments Inc");
2512 

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