Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1 4.2

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/mmc/slot-gpio.h>
 40 #include <linux/io.h>
 41 #include <linux/irq.h>
 42 #include <linux/gpio.h>
 43 #include <linux/regulator/consumer.h>
 44 #include <linux/pinctrl/consumer.h>
 45 #include <linux/pm_runtime.h>
 46 #include <linux/pm_wakeirq.h>
 47 #include <linux/platform_data/hsmmc-omap.h>
 48 
 49 /* OMAP HSMMC Host Controller Registers */
 50 #define OMAP_HSMMC_SYSSTATUS    0x0014
 51 #define OMAP_HSMMC_CON          0x002C
 52 #define OMAP_HSMMC_SDMASA       0x0100
 53 #define OMAP_HSMMC_BLK          0x0104
 54 #define OMAP_HSMMC_ARG          0x0108
 55 #define OMAP_HSMMC_CMD          0x010C
 56 #define OMAP_HSMMC_RSP10        0x0110
 57 #define OMAP_HSMMC_RSP32        0x0114
 58 #define OMAP_HSMMC_RSP54        0x0118
 59 #define OMAP_HSMMC_RSP76        0x011C
 60 #define OMAP_HSMMC_DATA         0x0120
 61 #define OMAP_HSMMC_PSTATE       0x0124
 62 #define OMAP_HSMMC_HCTL         0x0128
 63 #define OMAP_HSMMC_SYSCTL       0x012C
 64 #define OMAP_HSMMC_STAT         0x0130
 65 #define OMAP_HSMMC_IE           0x0134
 66 #define OMAP_HSMMC_ISE          0x0138
 67 #define OMAP_HSMMC_AC12         0x013C
 68 #define OMAP_HSMMC_CAPA         0x0140
 69 
 70 #define VS18                    (1 << 26)
 71 #define VS30                    (1 << 25)
 72 #define HSS                     (1 << 21)
 73 #define SDVS18                  (0x5 << 9)
 74 #define SDVS30                  (0x6 << 9)
 75 #define SDVS33                  (0x7 << 9)
 76 #define SDVS_MASK               0x00000E00
 77 #define SDVSCLR                 0xFFFFF1FF
 78 #define SDVSDET                 0x00000400
 79 #define AUTOIDLE                0x1
 80 #define SDBP                    (1 << 8)
 81 #define DTO                     0xe
 82 #define ICE                     0x1
 83 #define ICS                     0x2
 84 #define CEN                     (1 << 2)
 85 #define CLKD_MAX                0x3FF           /* max clock divisor: 1023 */
 86 #define CLKD_MASK               0x0000FFC0
 87 #define CLKD_SHIFT              6
 88 #define DTO_MASK                0x000F0000
 89 #define DTO_SHIFT               16
 90 #define INIT_STREAM             (1 << 1)
 91 #define ACEN_ACMD23             (2 << 2)
 92 #define DP_SELECT               (1 << 21)
 93 #define DDIR                    (1 << 4)
 94 #define DMAE                    0x1
 95 #define MSBS                    (1 << 5)
 96 #define BCE                     (1 << 1)
 97 #define FOUR_BIT                (1 << 1)
 98 #define HSPE                    (1 << 2)
 99 #define IWE                     (1 << 24)
100 #define DDR                     (1 << 19)
101 #define CLKEXTFREE              (1 << 16)
102 #define CTPL                    (1 << 11)
103 #define DW8                     (1 << 5)
104 #define OD                      0x1
105 #define STAT_CLEAR              0xFFFFFFFF
106 #define INIT_STREAM_CMD         0x00000000
107 #define DUAL_VOLT_OCR_BIT       7
108 #define SRC                     (1 << 25)
109 #define SRD                     (1 << 26)
110 #define SOFTRESET               (1 << 1)
111 
112 /* PSTATE */
113 #define DLEV_DAT(x)             (1 << (20 + (x)))
114 
115 /* Interrupt masks for IE and ISE register */
116 #define CC_EN                   (1 << 0)
117 #define TC_EN                   (1 << 1)
118 #define BWR_EN                  (1 << 4)
119 #define BRR_EN                  (1 << 5)
120 #define CIRQ_EN                 (1 << 8)
121 #define ERR_EN                  (1 << 15)
122 #define CTO_EN                  (1 << 16)
123 #define CCRC_EN                 (1 << 17)
124 #define CEB_EN                  (1 << 18)
125 #define CIE_EN                  (1 << 19)
126 #define DTO_EN                  (1 << 20)
127 #define DCRC_EN                 (1 << 21)
128 #define DEB_EN                  (1 << 22)
129 #define ACE_EN                  (1 << 24)
130 #define CERR_EN                 (1 << 28)
131 #define BADA_EN                 (1 << 29)
132 
133 #define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
134                 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
135                 BRR_EN | BWR_EN | TC_EN | CC_EN)
136 
137 #define CNI     (1 << 7)
138 #define ACIE    (1 << 4)
139 #define ACEB    (1 << 3)
140 #define ACCE    (1 << 2)
141 #define ACTO    (1 << 1)
142 #define ACNE    (1 << 0)
143 
144 #define MMC_AUTOSUSPEND_DELAY   100
145 #define MMC_TIMEOUT_MS          20              /* 20 mSec */
146 #define MMC_TIMEOUT_US          20000           /* 20000 micro Sec */
147 #define OMAP_MMC_MIN_CLOCK      400000
148 #define OMAP_MMC_MAX_CLOCK      52000000
149 #define DRIVER_NAME             "omap_hsmmc"
150 
151 #define VDD_1V8                 1800000         /* 180000 uV */
152 #define VDD_3V0                 3000000         /* 300000 uV */
153 #define VDD_165_195             (ffs(MMC_VDD_165_195) - 1)
154 
155 /*
156  * One controller can have multiple slots, like on some omap boards using
157  * omap.c controller driver. Luckily this is not currently done on any known
158  * omap_hsmmc.c device.
159  */
160 #define mmc_pdata(host)         host->pdata
161 
162 /*
163  * MMC Host controller read/write API's
164  */
165 #define OMAP_HSMMC_READ(base, reg)      \
166         __raw_readl((base) + OMAP_HSMMC_##reg)
167 
168 #define OMAP_HSMMC_WRITE(base, reg, val) \
169         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
170 
171 struct omap_hsmmc_next {
172         unsigned int    dma_len;
173         s32             cookie;
174 };
175 
176 struct omap_hsmmc_host {
177         struct  device          *dev;
178         struct  mmc_host        *mmc;
179         struct  mmc_request     *mrq;
180         struct  mmc_command     *cmd;
181         struct  mmc_data        *data;
182         struct  clk             *fclk;
183         struct  clk             *dbclk;
184         /*
185          * vcc == configured supply
186          * vcc_aux == optional
187          *   -  MMC1, supply for DAT4..DAT7
188          *   -  MMC2/MMC2, external level shifter voltage supply, for
189          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
190          */
191         struct  regulator       *vcc;
192         struct  regulator       *vcc_aux;
193         struct  regulator       *pbias;
194         bool                    pbias_enabled;
195         void    __iomem         *base;
196         resource_size_t         mapbase;
197         spinlock_t              irq_lock; /* Prevent races with irq handler */
198         unsigned int            dma_len;
199         unsigned int            dma_sg_idx;
200         unsigned char           bus_mode;
201         unsigned char           power_mode;
202         int                     suspended;
203         u32                     con;
204         u32                     hctl;
205         u32                     sysctl;
206         u32                     capa;
207         int                     irq;
208         int                     wake_irq;
209         int                     use_dma, dma_ch;
210         struct dma_chan         *tx_chan;
211         struct dma_chan         *rx_chan;
212         int                     response_busy;
213         int                     context_loss;
214         int                     protect_card;
215         int                     reqs_blocked;
216         int                     use_reg;
217         int                     req_in_progress;
218         unsigned long           clk_rate;
219         unsigned int            flags;
220 #define AUTO_CMD23              (1 << 0)        /* Auto CMD23 support */
221 #define HSMMC_SDIO_IRQ_ENABLED  (1 << 1)        /* SDIO irq enabled */
222         struct omap_hsmmc_next  next_data;
223         struct  omap_hsmmc_platform_data        *pdata;
224 
225         /* return MMC cover switch state, can be NULL if not supported.
226          *
227          * possible return values:
228          *   0 - closed
229          *   1 - open
230          */
231         int (*get_cover_state)(struct device *dev);
232 
233         int (*card_detect)(struct device *dev);
234 };
235 
236 struct omap_mmc_of_data {
237         u32 reg_offset;
238         u8 controller_flags;
239 };
240 
241 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
242 
243 static int omap_hsmmc_card_detect(struct device *dev)
244 {
245         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
246 
247         return mmc_gpio_get_cd(host->mmc);
248 }
249 
250 static int omap_hsmmc_get_cover_state(struct device *dev)
251 {
252         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
253 
254         return mmc_gpio_get_cd(host->mmc);
255 }
256 
257 #ifdef CONFIG_REGULATOR
258 
259 static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
260 {
261         struct omap_hsmmc_host *host =
262                 platform_get_drvdata(to_platform_device(dev));
263         int ret = 0;
264 
265         /*
266          * If we don't see a Vcc regulator, assume it's a fixed
267          * voltage always-on regulator.
268          */
269         if (!host->vcc)
270                 return 0;
271 
272         if (mmc_pdata(host)->before_set_reg)
273                 mmc_pdata(host)->before_set_reg(dev, power_on, vdd);
274 
275         if (host->pbias) {
276                 if (host->pbias_enabled == 1) {
277                         ret = regulator_disable(host->pbias);
278                         if (!ret)
279                                 host->pbias_enabled = 0;
280                 }
281                 regulator_set_voltage(host->pbias, VDD_3V0, VDD_3V0);
282         }
283 
284         /*
285          * Assume Vcc regulator is used only to power the card ... OMAP
286          * VDDS is used to power the pins, optionally with a transceiver to
287          * support cards using voltages other than VDDS (1.8V nominal).  When a
288          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
289          *
290          * In some cases this regulator won't support enable/disable;
291          * e.g. it's a fixed rail for a WLAN chip.
292          *
293          * In other cases vcc_aux switches interface power.  Example, for
294          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
295          * chips/cards need an interface voltage rail too.
296          */
297         if (power_on) {
298                 if (host->vcc)
299                         ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
300                 /* Enable interface voltage rail, if needed */
301                 if (ret == 0 && host->vcc_aux) {
302                         ret = regulator_enable(host->vcc_aux);
303                         if (ret < 0 && host->vcc)
304                                 ret = mmc_regulator_set_ocr(host->mmc,
305                                                         host->vcc, 0);
306                 }
307         } else {
308                 /* Shut down the rail */
309                 if (host->vcc_aux)
310                         ret = regulator_disable(host->vcc_aux);
311                 if (host->vcc) {
312                         /* Then proceed to shut down the local regulator */
313                         ret = mmc_regulator_set_ocr(host->mmc,
314                                                 host->vcc, 0);
315                 }
316         }
317 
318         if (host->pbias) {
319                 if (vdd <= VDD_165_195)
320                         ret = regulator_set_voltage(host->pbias, VDD_1V8,
321                                                                 VDD_1V8);
322                 else
323                         ret = regulator_set_voltage(host->pbias, VDD_3V0,
324                                                                 VDD_3V0);
325                 if (ret < 0)
326                         goto error_set_power;
327 
328                 if (host->pbias_enabled == 0) {
329                         ret = regulator_enable(host->pbias);
330                         if (!ret)
331                                 host->pbias_enabled = 1;
332                 }
333         }
334 
335         if (mmc_pdata(host)->after_set_reg)
336                 mmc_pdata(host)->after_set_reg(dev, power_on, vdd);
337 
338 error_set_power:
339         return ret;
340 }
341 
342 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
343 {
344         struct regulator *reg;
345         int ocr_value = 0;
346 
347         reg = devm_regulator_get(host->dev, "vmmc");
348         if (IS_ERR(reg)) {
349                 dev_err(host->dev, "unable to get vmmc regulator %ld\n",
350                         PTR_ERR(reg));
351                 return PTR_ERR(reg);
352         } else {
353                 host->vcc = reg;
354                 ocr_value = mmc_regulator_get_ocrmask(reg);
355                 if (!mmc_pdata(host)->ocr_mask) {
356                         mmc_pdata(host)->ocr_mask = ocr_value;
357                 } else {
358                         if (!(mmc_pdata(host)->ocr_mask & ocr_value)) {
359                                 dev_err(host->dev, "ocrmask %x is not supported\n",
360                                         mmc_pdata(host)->ocr_mask);
361                                 mmc_pdata(host)->ocr_mask = 0;
362                                 return -EINVAL;
363                         }
364                 }
365         }
366         mmc_pdata(host)->set_power = omap_hsmmc_set_power;
367 
368         /* Allow an aux regulator */
369         reg = devm_regulator_get_optional(host->dev, "vmmc_aux");
370         host->vcc_aux = IS_ERR(reg) ? NULL : reg;
371 
372         reg = devm_regulator_get_optional(host->dev, "pbias");
373         host->pbias = IS_ERR(reg) ? NULL : reg;
374 
375         /* For eMMC do not power off when not in sleep state */
376         if (mmc_pdata(host)->no_regulator_off_init)
377                 return 0;
378         /*
379          * To disable boot_on regulator, enable regulator
380          * to increase usecount and then disable it.
381          */
382         if ((host->vcc && regulator_is_enabled(host->vcc) > 0) ||
383             (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
384                 int vdd = ffs(mmc_pdata(host)->ocr_mask) - 1;
385 
386                 mmc_pdata(host)->set_power(host->dev, 1, vdd);
387                 mmc_pdata(host)->set_power(host->dev, 0, 0);
388         }
389 
390         return 0;
391 }
392 
393 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
394 {
395         mmc_pdata(host)->set_power = NULL;
396 }
397 
398 static inline int omap_hsmmc_have_reg(void)
399 {
400         return 1;
401 }
402 
403 #else
404 
405 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
406 {
407         return -EINVAL;
408 }
409 
410 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
411 {
412 }
413 
414 static inline int omap_hsmmc_have_reg(void)
415 {
416         return 0;
417 }
418 
419 #endif
420 
421 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id);
422 
423 static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
424                                 struct omap_hsmmc_host *host,
425                                 struct omap_hsmmc_platform_data *pdata)
426 {
427         int ret;
428 
429         if (gpio_is_valid(pdata->gpio_cod)) {
430                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cod, 0);
431                 if (ret)
432                         return ret;
433 
434                 host->get_cover_state = omap_hsmmc_get_cover_state;
435                 mmc_gpio_set_cd_isr(mmc, omap_hsmmc_cover_irq);
436         } else if (gpio_is_valid(pdata->gpio_cd)) {
437                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0);
438                 if (ret)
439                         return ret;
440 
441                 host->card_detect = omap_hsmmc_card_detect;
442         }
443 
444         if (gpio_is_valid(pdata->gpio_wp)) {
445                 ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
446                 if (ret)
447                         return ret;
448         }
449 
450         return 0;
451 }
452 
453 /*
454  * Start clock to the card
455  */
456 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
457 {
458         OMAP_HSMMC_WRITE(host->base, SYSCTL,
459                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
460 }
461 
462 /*
463  * Stop clock to the card
464  */
465 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
466 {
467         OMAP_HSMMC_WRITE(host->base, SYSCTL,
468                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
469         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
470                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
471 }
472 
473 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
474                                   struct mmc_command *cmd)
475 {
476         u32 irq_mask = INT_EN_MASK;
477         unsigned long flags;
478 
479         if (host->use_dma)
480                 irq_mask &= ~(BRR_EN | BWR_EN);
481 
482         /* Disable timeout for erases */
483         if (cmd->opcode == MMC_ERASE)
484                 irq_mask &= ~DTO_EN;
485 
486         spin_lock_irqsave(&host->irq_lock, flags);
487         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
488         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
489 
490         /* latch pending CIRQ, but don't signal MMC core */
491         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
492                 irq_mask |= CIRQ_EN;
493         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
494         spin_unlock_irqrestore(&host->irq_lock, flags);
495 }
496 
497 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
498 {
499         u32 irq_mask = 0;
500         unsigned long flags;
501 
502         spin_lock_irqsave(&host->irq_lock, flags);
503         /* no transfer running but need to keep cirq if enabled */
504         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
505                 irq_mask |= CIRQ_EN;
506         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
507         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
508         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
509         spin_unlock_irqrestore(&host->irq_lock, flags);
510 }
511 
512 /* Calculate divisor for the given clock frequency */
513 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
514 {
515         u16 dsor = 0;
516 
517         if (ios->clock) {
518                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
519                 if (dsor > CLKD_MAX)
520                         dsor = CLKD_MAX;
521         }
522 
523         return dsor;
524 }
525 
526 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
527 {
528         struct mmc_ios *ios = &host->mmc->ios;
529         unsigned long regval;
530         unsigned long timeout;
531         unsigned long clkdiv;
532 
533         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
534 
535         omap_hsmmc_stop_clock(host);
536 
537         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
538         regval = regval & ~(CLKD_MASK | DTO_MASK);
539         clkdiv = calc_divisor(host, ios);
540         regval = regval | (clkdiv << 6) | (DTO << 16);
541         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
542         OMAP_HSMMC_WRITE(host->base, SYSCTL,
543                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
544 
545         /* Wait till the ICS bit is set */
546         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
547         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
548                 && time_before(jiffies, timeout))
549                 cpu_relax();
550 
551         /*
552          * Enable High-Speed Support
553          * Pre-Requisites
554          *      - Controller should support High-Speed-Enable Bit
555          *      - Controller should not be using DDR Mode
556          *      - Controller should advertise that it supports High Speed
557          *        in capabilities register
558          *      - MMC/SD clock coming out of controller > 25MHz
559          */
560         if ((mmc_pdata(host)->features & HSMMC_HAS_HSPE_SUPPORT) &&
561             (ios->timing != MMC_TIMING_MMC_DDR52) &&
562             (ios->timing != MMC_TIMING_UHS_DDR50) &&
563             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
564                 regval = OMAP_HSMMC_READ(host->base, HCTL);
565                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
566                         regval |= HSPE;
567                 else
568                         regval &= ~HSPE;
569 
570                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
571         }
572 
573         omap_hsmmc_start_clock(host);
574 }
575 
576 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
577 {
578         struct mmc_ios *ios = &host->mmc->ios;
579         u32 con;
580 
581         con = OMAP_HSMMC_READ(host->base, CON);
582         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
583             ios->timing == MMC_TIMING_UHS_DDR50)
584                 con |= DDR;     /* configure in DDR mode */
585         else
586                 con &= ~DDR;
587         switch (ios->bus_width) {
588         case MMC_BUS_WIDTH_8:
589                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
590                 break;
591         case MMC_BUS_WIDTH_4:
592                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
593                 OMAP_HSMMC_WRITE(host->base, HCTL,
594                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
595                 break;
596         case MMC_BUS_WIDTH_1:
597                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
598                 OMAP_HSMMC_WRITE(host->base, HCTL,
599                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
600                 break;
601         }
602 }
603 
604 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
605 {
606         struct mmc_ios *ios = &host->mmc->ios;
607         u32 con;
608 
609         con = OMAP_HSMMC_READ(host->base, CON);
610         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
611                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
612         else
613                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
614 }
615 
616 #ifdef CONFIG_PM
617 
618 /*
619  * Restore the MMC host context, if it was lost as result of a
620  * power state change.
621  */
622 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
623 {
624         struct mmc_ios *ios = &host->mmc->ios;
625         u32 hctl, capa;
626         unsigned long timeout;
627 
628         if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
629             host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
630             host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
631             host->capa == OMAP_HSMMC_READ(host->base, CAPA))
632                 return 0;
633 
634         host->context_loss++;
635 
636         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
637                 if (host->power_mode != MMC_POWER_OFF &&
638                     (1 << ios->vdd) <= MMC_VDD_23_24)
639                         hctl = SDVS18;
640                 else
641                         hctl = SDVS30;
642                 capa = VS30 | VS18;
643         } else {
644                 hctl = SDVS18;
645                 capa = VS18;
646         }
647 
648         if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
649                 hctl |= IWE;
650 
651         OMAP_HSMMC_WRITE(host->base, HCTL,
652                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
653 
654         OMAP_HSMMC_WRITE(host->base, CAPA,
655                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
656 
657         OMAP_HSMMC_WRITE(host->base, HCTL,
658                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
659 
660         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
661         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
662                 && time_before(jiffies, timeout))
663                 ;
664 
665         OMAP_HSMMC_WRITE(host->base, ISE, 0);
666         OMAP_HSMMC_WRITE(host->base, IE, 0);
667         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
668 
669         /* Do not initialize card-specific things if the power is off */
670         if (host->power_mode == MMC_POWER_OFF)
671                 goto out;
672 
673         omap_hsmmc_set_bus_width(host);
674 
675         omap_hsmmc_set_clock(host);
676 
677         omap_hsmmc_set_bus_mode(host);
678 
679 out:
680         dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
681                 host->context_loss);
682         return 0;
683 }
684 
685 /*
686  * Save the MMC host context (store the number of power state changes so far).
687  */
688 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
689 {
690         host->con =  OMAP_HSMMC_READ(host->base, CON);
691         host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
692         host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
693         host->capa = OMAP_HSMMC_READ(host->base, CAPA);
694 }
695 
696 #else
697 
698 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
699 {
700         return 0;
701 }
702 
703 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
704 {
705 }
706 
707 #endif
708 
709 /*
710  * Send init stream sequence to card
711  * before sending IDLE command
712  */
713 static void send_init_stream(struct omap_hsmmc_host *host)
714 {
715         int reg = 0;
716         unsigned long timeout;
717 
718         if (host->protect_card)
719                 return;
720 
721         disable_irq(host->irq);
722 
723         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
724         OMAP_HSMMC_WRITE(host->base, CON,
725                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
726         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
727 
728         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
729         while ((reg != CC_EN) && time_before(jiffies, timeout))
730                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
731 
732         OMAP_HSMMC_WRITE(host->base, CON,
733                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
734 
735         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
736         OMAP_HSMMC_READ(host->base, STAT);
737 
738         enable_irq(host->irq);
739 }
740 
741 static inline
742 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
743 {
744         int r = 1;
745 
746         if (host->get_cover_state)
747                 r = host->get_cover_state(host->dev);
748         return r;
749 }
750 
751 static ssize_t
752 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
753                            char *buf)
754 {
755         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
756         struct omap_hsmmc_host *host = mmc_priv(mmc);
757 
758         return sprintf(buf, "%s\n",
759                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
760 }
761 
762 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
763 
764 static ssize_t
765 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
766                         char *buf)
767 {
768         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
769         struct omap_hsmmc_host *host = mmc_priv(mmc);
770 
771         return sprintf(buf, "%s\n", mmc_pdata(host)->name);
772 }
773 
774 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
775 
776 /*
777  * Configure the response type and send the cmd.
778  */
779 static void
780 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
781         struct mmc_data *data)
782 {
783         int cmdreg = 0, resptype = 0, cmdtype = 0;
784 
785         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
786                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
787         host->cmd = cmd;
788 
789         omap_hsmmc_enable_irq(host, cmd);
790 
791         host->response_busy = 0;
792         if (cmd->flags & MMC_RSP_PRESENT) {
793                 if (cmd->flags & MMC_RSP_136)
794                         resptype = 1;
795                 else if (cmd->flags & MMC_RSP_BUSY) {
796                         resptype = 3;
797                         host->response_busy = 1;
798                 } else
799                         resptype = 2;
800         }
801 
802         /*
803          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
804          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
805          * a val of 0x3, rest 0x0.
806          */
807         if (cmd == host->mrq->stop)
808                 cmdtype = 0x3;
809 
810         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
811 
812         if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
813             host->mrq->sbc) {
814                 cmdreg |= ACEN_ACMD23;
815                 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
816         }
817         if (data) {
818                 cmdreg |= DP_SELECT | MSBS | BCE;
819                 if (data->flags & MMC_DATA_READ)
820                         cmdreg |= DDIR;
821                 else
822                         cmdreg &= ~(DDIR);
823         }
824 
825         if (host->use_dma)
826                 cmdreg |= DMAE;
827 
828         host->req_in_progress = 1;
829 
830         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
831         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
832 }
833 
834 static int
835 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
836 {
837         if (data->flags & MMC_DATA_WRITE)
838                 return DMA_TO_DEVICE;
839         else
840                 return DMA_FROM_DEVICE;
841 }
842 
843 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
844         struct mmc_data *data)
845 {
846         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
847 }
848 
849 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
850 {
851         int dma_ch;
852         unsigned long flags;
853 
854         spin_lock_irqsave(&host->irq_lock, flags);
855         host->req_in_progress = 0;
856         dma_ch = host->dma_ch;
857         spin_unlock_irqrestore(&host->irq_lock, flags);
858 
859         omap_hsmmc_disable_irq(host);
860         /* Do not complete the request if DMA is still in progress */
861         if (mrq->data && host->use_dma && dma_ch != -1)
862                 return;
863         host->mrq = NULL;
864         mmc_request_done(host->mmc, mrq);
865         pm_runtime_mark_last_busy(host->dev);
866         pm_runtime_put_autosuspend(host->dev);
867 }
868 
869 /*
870  * Notify the transfer complete to MMC core
871  */
872 static void
873 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
874 {
875         if (!data) {
876                 struct mmc_request *mrq = host->mrq;
877 
878                 /* TC before CC from CMD6 - don't know why, but it happens */
879                 if (host->cmd && host->cmd->opcode == 6 &&
880                     host->response_busy) {
881                         host->response_busy = 0;
882                         return;
883                 }
884 
885                 omap_hsmmc_request_done(host, mrq);
886                 return;
887         }
888 
889         host->data = NULL;
890 
891         if (!data->error)
892                 data->bytes_xfered += data->blocks * (data->blksz);
893         else
894                 data->bytes_xfered = 0;
895 
896         if (data->stop && (data->error || !host->mrq->sbc))
897                 omap_hsmmc_start_command(host, data->stop, NULL);
898         else
899                 omap_hsmmc_request_done(host, data->mrq);
900 }
901 
902 /*
903  * Notify the core about command completion
904  */
905 static void
906 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
907 {
908         if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
909             !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
910                 host->cmd = NULL;
911                 omap_hsmmc_start_dma_transfer(host);
912                 omap_hsmmc_start_command(host, host->mrq->cmd,
913                                                 host->mrq->data);
914                 return;
915         }
916 
917         host->cmd = NULL;
918 
919         if (cmd->flags & MMC_RSP_PRESENT) {
920                 if (cmd->flags & MMC_RSP_136) {
921                         /* response type 2 */
922                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
923                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
924                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
925                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
926                 } else {
927                         /* response types 1, 1b, 3, 4, 5, 6 */
928                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
929                 }
930         }
931         if ((host->data == NULL && !host->response_busy) || cmd->error)
932                 omap_hsmmc_request_done(host, host->mrq);
933 }
934 
935 /*
936  * DMA clean up for command errors
937  */
938 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
939 {
940         int dma_ch;
941         unsigned long flags;
942 
943         host->data->error = errno;
944 
945         spin_lock_irqsave(&host->irq_lock, flags);
946         dma_ch = host->dma_ch;
947         host->dma_ch = -1;
948         spin_unlock_irqrestore(&host->irq_lock, flags);
949 
950         if (host->use_dma && dma_ch != -1) {
951                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
952 
953                 dmaengine_terminate_all(chan);
954                 dma_unmap_sg(chan->device->dev,
955                         host->data->sg, host->data->sg_len,
956                         omap_hsmmc_get_dma_dir(host, host->data));
957 
958                 host->data->host_cookie = 0;
959         }
960         host->data = NULL;
961 }
962 
963 /*
964  * Readable error output
965  */
966 #ifdef CONFIG_MMC_DEBUG
967 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
968 {
969         /* --- means reserved bit without definition at documentation */
970         static const char *omap_hsmmc_status_bits[] = {
971                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
972                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
973                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
974                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
975         };
976         char res[256];
977         char *buf = res;
978         int len, i;
979 
980         len = sprintf(buf, "MMC IRQ 0x%x :", status);
981         buf += len;
982 
983         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
984                 if (status & (1 << i)) {
985                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
986                         buf += len;
987                 }
988 
989         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
990 }
991 #else
992 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
993                                              u32 status)
994 {
995 }
996 #endif  /* CONFIG_MMC_DEBUG */
997 
998 /*
999  * MMC controller internal state machines reset
1000  *
1001  * Used to reset command or data internal state machines, using respectively
1002  *  SRC or SRD bit of SYSCTL register
1003  * Can be called from interrupt context
1004  */
1005 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1006                                                    unsigned long bit)
1007 {
1008         unsigned long i = 0;
1009         unsigned long limit = MMC_TIMEOUT_US;
1010 
1011         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1012                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1013 
1014         /*
1015          * OMAP4 ES2 and greater has an updated reset logic.
1016          * Monitor a 0->1 transition first
1017          */
1018         if (mmc_pdata(host)->features & HSMMC_HAS_UPDATED_RESET) {
1019                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1020                                         && (i++ < limit))
1021                         udelay(1);
1022         }
1023         i = 0;
1024 
1025         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1026                 (i++ < limit))
1027                 udelay(1);
1028 
1029         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1030                 dev_err(mmc_dev(host->mmc),
1031                         "Timeout waiting on controller reset in %s\n",
1032                         __func__);
1033 }
1034 
1035 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1036                                         int err, int end_cmd)
1037 {
1038         if (end_cmd) {
1039                 omap_hsmmc_reset_controller_fsm(host, SRC);
1040                 if (host->cmd)
1041                         host->cmd->error = err;
1042         }
1043 
1044         if (host->data) {
1045                 omap_hsmmc_reset_controller_fsm(host, SRD);
1046                 omap_hsmmc_dma_cleanup(host, err);
1047         } else if (host->mrq && host->mrq->cmd)
1048                 host->mrq->cmd->error = err;
1049 }
1050 
1051 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1052 {
1053         struct mmc_data *data;
1054         int end_cmd = 0, end_trans = 0;
1055         int error = 0;
1056 
1057         data = host->data;
1058         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1059 
1060         if (status & ERR_EN) {
1061                 omap_hsmmc_dbg_report_irq(host, status);
1062 
1063                 if (status & (CTO_EN | CCRC_EN))
1064                         end_cmd = 1;
1065                 if (host->data || host->response_busy) {
1066                         end_trans = !end_cmd;
1067                         host->response_busy = 0;
1068                 }
1069                 if (status & (CTO_EN | DTO_EN))
1070                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1071                 else if (status & (CCRC_EN | DCRC_EN | DEB_EN | CEB_EN |
1072                                    BADA_EN))
1073                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1074 
1075                 if (status & ACE_EN) {
1076                         u32 ac12;
1077                         ac12 = OMAP_HSMMC_READ(host->base, AC12);
1078                         if (!(ac12 & ACNE) && host->mrq->sbc) {
1079                                 end_cmd = 1;
1080                                 if (ac12 & ACTO)
1081                                         error =  -ETIMEDOUT;
1082                                 else if (ac12 & (ACCE | ACEB | ACIE))
1083                                         error = -EILSEQ;
1084                                 host->mrq->sbc->error = error;
1085                                 hsmmc_command_incomplete(host, error, end_cmd);
1086                         }
1087                         dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
1088                 }
1089         }
1090 
1091         OMAP_HSMMC_WRITE(host->base, STAT, status);
1092         if (end_cmd || ((status & CC_EN) && host->cmd))
1093                 omap_hsmmc_cmd_done(host, host->cmd);
1094         if ((end_trans || (status & TC_EN)) && host->mrq)
1095                 omap_hsmmc_xfer_done(host, data);
1096 }
1097 
1098 /*
1099  * MMC controller IRQ handler
1100  */
1101 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1102 {
1103         struct omap_hsmmc_host *host = dev_id;
1104         int status;
1105 
1106         status = OMAP_HSMMC_READ(host->base, STAT);
1107         while (status & (INT_EN_MASK | CIRQ_EN)) {
1108                 if (host->req_in_progress)
1109                         omap_hsmmc_do_irq(host, status);
1110 
1111                 if (status & CIRQ_EN)
1112                         mmc_signal_sdio_irq(host->mmc);
1113 
1114                 /* Flush posted write */
1115                 status = OMAP_HSMMC_READ(host->base, STAT);
1116         }
1117 
1118         return IRQ_HANDLED;
1119 }
1120 
1121 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1122 {
1123         unsigned long i;
1124 
1125         OMAP_HSMMC_WRITE(host->base, HCTL,
1126                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1127         for (i = 0; i < loops_per_jiffy; i++) {
1128                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1129                         break;
1130                 cpu_relax();
1131         }
1132 }
1133 
1134 /*
1135  * Switch MMC interface voltage ... only relevant for MMC1.
1136  *
1137  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1138  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1139  * Some chips, like eMMC ones, use internal transceivers.
1140  */
1141 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1142 {
1143         u32 reg_val = 0;
1144         int ret;
1145 
1146         /* Disable the clocks */
1147         pm_runtime_put_sync(host->dev);
1148         if (host->dbclk)
1149                 clk_disable_unprepare(host->dbclk);
1150 
1151         /* Turn the power off */
1152         ret = mmc_pdata(host)->set_power(host->dev, 0, 0);
1153 
1154         /* Turn the power ON with given VDD 1.8 or 3.0v */
1155         if (!ret)
1156                 ret = mmc_pdata(host)->set_power(host->dev, 1, vdd);
1157         pm_runtime_get_sync(host->dev);
1158         if (host->dbclk)
1159                 clk_prepare_enable(host->dbclk);
1160 
1161         if (ret != 0)
1162                 goto err;
1163 
1164         OMAP_HSMMC_WRITE(host->base, HCTL,
1165                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1166         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1167 
1168         /*
1169          * If a MMC dual voltage card is detected, the set_ios fn calls
1170          * this fn with VDD bit set for 1.8V. Upon card removal from the
1171          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1172          *
1173          * Cope with a bit of slop in the range ... per data sheets:
1174          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1175          *    but recommended values are 1.71V to 1.89V
1176          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1177          *    but recommended values are 2.7V to 3.3V
1178          *
1179          * Board setup code shouldn't permit anything very out-of-range.
1180          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1181          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1182          */
1183         if ((1 << vdd) <= MMC_VDD_23_24)
1184                 reg_val |= SDVS18;
1185         else
1186                 reg_val |= SDVS30;
1187 
1188         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1189         set_sd_bus_power(host);
1190 
1191         return 0;
1192 err:
1193         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1194         return ret;
1195 }
1196 
1197 /* Protect the card while the cover is open */
1198 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1199 {
1200         if (!host->get_cover_state)
1201                 return;
1202 
1203         host->reqs_blocked = 0;
1204         if (host->get_cover_state(host->dev)) {
1205                 if (host->protect_card) {
1206                         dev_info(host->dev, "%s: cover is closed, "
1207                                          "card is now accessible\n",
1208                                          mmc_hostname(host->mmc));
1209                         host->protect_card = 0;
1210                 }
1211         } else {
1212                 if (!host->protect_card) {
1213                         dev_info(host->dev, "%s: cover is open, "
1214                                          "card is now inaccessible\n",
1215                                          mmc_hostname(host->mmc));
1216                         host->protect_card = 1;
1217                 }
1218         }
1219 }
1220 
1221 /*
1222  * irq handler when (cell-phone) cover is mounted/removed
1223  */
1224 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id)
1225 {
1226         struct omap_hsmmc_host *host = dev_id;
1227 
1228         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1229 
1230         omap_hsmmc_protect_card(host);
1231         mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1232         return IRQ_HANDLED;
1233 }
1234 
1235 static void omap_hsmmc_dma_callback(void *param)
1236 {
1237         struct omap_hsmmc_host *host = param;
1238         struct dma_chan *chan;
1239         struct mmc_data *data;
1240         int req_in_progress;
1241 
1242         spin_lock_irq(&host->irq_lock);
1243         if (host->dma_ch < 0) {
1244                 spin_unlock_irq(&host->irq_lock);
1245                 return;
1246         }
1247 
1248         data = host->mrq->data;
1249         chan = omap_hsmmc_get_dma_chan(host, data);
1250         if (!data->host_cookie)
1251                 dma_unmap_sg(chan->device->dev,
1252                              data->sg, data->sg_len,
1253                              omap_hsmmc_get_dma_dir(host, data));
1254 
1255         req_in_progress = host->req_in_progress;
1256         host->dma_ch = -1;
1257         spin_unlock_irq(&host->irq_lock);
1258 
1259         /* If DMA has finished after TC, complete the request */
1260         if (!req_in_progress) {
1261                 struct mmc_request *mrq = host->mrq;
1262 
1263                 host->mrq = NULL;
1264                 mmc_request_done(host->mmc, mrq);
1265                 pm_runtime_mark_last_busy(host->dev);
1266                 pm_runtime_put_autosuspend(host->dev);
1267         }
1268 }
1269 
1270 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1271                                        struct mmc_data *data,
1272                                        struct omap_hsmmc_next *next,
1273                                        struct dma_chan *chan)
1274 {
1275         int dma_len;
1276 
1277         if (!next && data->host_cookie &&
1278             data->host_cookie != host->next_data.cookie) {
1279                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1280                        " host->next_data.cookie %d\n",
1281                        __func__, data->host_cookie, host->next_data.cookie);
1282                 data->host_cookie = 0;
1283         }
1284 
1285         /* Check if next job is already prepared */
1286         if (next || data->host_cookie != host->next_data.cookie) {
1287                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1288                                      omap_hsmmc_get_dma_dir(host, data));
1289 
1290         } else {
1291                 dma_len = host->next_data.dma_len;
1292                 host->next_data.dma_len = 0;
1293         }
1294 
1295 
1296         if (dma_len == 0)
1297                 return -EINVAL;
1298 
1299         if (next) {
1300                 next->dma_len = dma_len;
1301                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1302         } else
1303                 host->dma_len = dma_len;
1304 
1305         return 0;
1306 }
1307 
1308 /*
1309  * Routine to configure and start DMA for the MMC card
1310  */
1311 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
1312                                         struct mmc_request *req)
1313 {
1314         struct dma_slave_config cfg;
1315         struct dma_async_tx_descriptor *tx;
1316         int ret = 0, i;
1317         struct mmc_data *data = req->data;
1318         struct dma_chan *chan;
1319 
1320         /* Sanity check: all the SG entries must be aligned by block size. */
1321         for (i = 0; i < data->sg_len; i++) {
1322                 struct scatterlist *sgl;
1323 
1324                 sgl = data->sg + i;
1325                 if (sgl->length % data->blksz)
1326                         return -EINVAL;
1327         }
1328         if ((data->blksz % 4) != 0)
1329                 /* REVISIT: The MMC buffer increments only when MSB is written.
1330                  * Return error for blksz which is non multiple of four.
1331                  */
1332                 return -EINVAL;
1333 
1334         BUG_ON(host->dma_ch != -1);
1335 
1336         chan = omap_hsmmc_get_dma_chan(host, data);
1337 
1338         cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
1339         cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
1340         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1341         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1342         cfg.src_maxburst = data->blksz / 4;
1343         cfg.dst_maxburst = data->blksz / 4;
1344 
1345         ret = dmaengine_slave_config(chan, &cfg);
1346         if (ret)
1347                 return ret;
1348 
1349         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1350         if (ret)
1351                 return ret;
1352 
1353         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1354                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1355                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1356         if (!tx) {
1357                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1358                 /* FIXME: cleanup */
1359                 return -1;
1360         }
1361 
1362         tx->callback = omap_hsmmc_dma_callback;
1363         tx->callback_param = host;
1364 
1365         /* Does not fail */
1366         dmaengine_submit(tx);
1367 
1368         host->dma_ch = 1;
1369 
1370         return 0;
1371 }
1372 
1373 static void set_data_timeout(struct omap_hsmmc_host *host,
1374                              unsigned int timeout_ns,
1375                              unsigned int timeout_clks)
1376 {
1377         unsigned int timeout, cycle_ns;
1378         uint32_t reg, clkd, dto = 0;
1379 
1380         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1381         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1382         if (clkd == 0)
1383                 clkd = 1;
1384 
1385         cycle_ns = 1000000000 / (host->clk_rate / clkd);
1386         timeout = timeout_ns / cycle_ns;
1387         timeout += timeout_clks;
1388         if (timeout) {
1389                 while ((timeout & 0x80000000) == 0) {
1390                         dto += 1;
1391                         timeout <<= 1;
1392                 }
1393                 dto = 31 - dto;
1394                 timeout <<= 1;
1395                 if (timeout && dto)
1396                         dto += 1;
1397                 if (dto >= 13)
1398                         dto -= 13;
1399                 else
1400                         dto = 0;
1401                 if (dto > 14)
1402                         dto = 14;
1403         }
1404 
1405         reg &= ~DTO_MASK;
1406         reg |= dto << DTO_SHIFT;
1407         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1408 }
1409 
1410 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
1411 {
1412         struct mmc_request *req = host->mrq;
1413         struct dma_chan *chan;
1414 
1415         if (!req->data)
1416                 return;
1417         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1418                                 | (req->data->blocks << 16));
1419         set_data_timeout(host, req->data->timeout_ns,
1420                                 req->data->timeout_clks);
1421         chan = omap_hsmmc_get_dma_chan(host, req->data);
1422         dma_async_issue_pending(chan);
1423 }
1424 
1425 /*
1426  * Configure block length for MMC/SD cards and initiate the transfer.
1427  */
1428 static int
1429 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1430 {
1431         int ret;
1432         host->data = req->data;
1433 
1434         if (req->data == NULL) {
1435                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1436                 /*
1437                  * Set an arbitrary 100ms data timeout for commands with
1438                  * busy signal.
1439                  */
1440                 if (req->cmd->flags & MMC_RSP_BUSY)
1441                         set_data_timeout(host, 100000000U, 0);
1442                 return 0;
1443         }
1444 
1445         if (host->use_dma) {
1446                 ret = omap_hsmmc_setup_dma_transfer(host, req);
1447                 if (ret != 0) {
1448                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1449                         return ret;
1450                 }
1451         }
1452         return 0;
1453 }
1454 
1455 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1456                                 int err)
1457 {
1458         struct omap_hsmmc_host *host = mmc_priv(mmc);
1459         struct mmc_data *data = mrq->data;
1460 
1461         if (host->use_dma && data->host_cookie) {
1462                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1463 
1464                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1465                              omap_hsmmc_get_dma_dir(host, data));
1466                 data->host_cookie = 0;
1467         }
1468 }
1469 
1470 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1471                                bool is_first_req)
1472 {
1473         struct omap_hsmmc_host *host = mmc_priv(mmc);
1474 
1475         if (mrq->data->host_cookie) {
1476                 mrq->data->host_cookie = 0;
1477                 return ;
1478         }
1479 
1480         if (host->use_dma) {
1481                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1482 
1483                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1484                                                 &host->next_data, c))
1485                         mrq->data->host_cookie = 0;
1486         }
1487 }
1488 
1489 /*
1490  * Request function. for read/write operation
1491  */
1492 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1493 {
1494         struct omap_hsmmc_host *host = mmc_priv(mmc);
1495         int err;
1496 
1497         BUG_ON(host->req_in_progress);
1498         BUG_ON(host->dma_ch != -1);
1499         pm_runtime_get_sync(host->dev);
1500         if (host->protect_card) {
1501                 if (host->reqs_blocked < 3) {
1502                         /*
1503                          * Ensure the controller is left in a consistent
1504                          * state by resetting the command and data state
1505                          * machines.
1506                          */
1507                         omap_hsmmc_reset_controller_fsm(host, SRD);
1508                         omap_hsmmc_reset_controller_fsm(host, SRC);
1509                         host->reqs_blocked += 1;
1510                 }
1511                 req->cmd->error = -EBADF;
1512                 if (req->data)
1513                         req->data->error = -EBADF;
1514                 req->cmd->retries = 0;
1515                 mmc_request_done(mmc, req);
1516                 pm_runtime_mark_last_busy(host->dev);
1517                 pm_runtime_put_autosuspend(host->dev);
1518                 return;
1519         } else if (host->reqs_blocked)
1520                 host->reqs_blocked = 0;
1521         WARN_ON(host->mrq != NULL);
1522         host->mrq = req;
1523         host->clk_rate = clk_get_rate(host->fclk);
1524         err = omap_hsmmc_prepare_data(host, req);
1525         if (err) {
1526                 req->cmd->error = err;
1527                 if (req->data)
1528                         req->data->error = err;
1529                 host->mrq = NULL;
1530                 mmc_request_done(mmc, req);
1531                 pm_runtime_mark_last_busy(host->dev);
1532                 pm_runtime_put_autosuspend(host->dev);
1533                 return;
1534         }
1535         if (req->sbc && !(host->flags & AUTO_CMD23)) {
1536                 omap_hsmmc_start_command(host, req->sbc, NULL);
1537                 return;
1538         }
1539 
1540         omap_hsmmc_start_dma_transfer(host);
1541         omap_hsmmc_start_command(host, req->cmd, req->data);
1542 }
1543 
1544 /* Routine to configure clock values. Exposed API to core */
1545 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1546 {
1547         struct omap_hsmmc_host *host = mmc_priv(mmc);
1548         int do_send_init_stream = 0;
1549 
1550         pm_runtime_get_sync(host->dev);
1551 
1552         if (ios->power_mode != host->power_mode) {
1553                 switch (ios->power_mode) {
1554                 case MMC_POWER_OFF:
1555                         mmc_pdata(host)->set_power(host->dev, 0, 0);
1556                         break;
1557                 case MMC_POWER_UP:
1558                         mmc_pdata(host)->set_power(host->dev, 1, ios->vdd);
1559                         break;
1560                 case MMC_POWER_ON:
1561                         do_send_init_stream = 1;
1562                         break;
1563                 }
1564                 host->power_mode = ios->power_mode;
1565         }
1566 
1567         /* FIXME: set registers based only on changes to ios */
1568 
1569         omap_hsmmc_set_bus_width(host);
1570 
1571         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1572                 /* Only MMC1 can interface at 3V without some flavor
1573                  * of external transceiver; but they all handle 1.8V.
1574                  */
1575                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1576                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1577                                 /*
1578                                  * The mmc_select_voltage fn of the core does
1579                                  * not seem to set the power_mode to
1580                                  * MMC_POWER_UP upon recalculating the voltage.
1581                                  * vdd 1.8v.
1582                                  */
1583                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1584                                 dev_dbg(mmc_dev(host->mmc),
1585                                                 "Switch operation failed\n");
1586                 }
1587         }
1588 
1589         omap_hsmmc_set_clock(host);
1590 
1591         if (do_send_init_stream)
1592                 send_init_stream(host);
1593 
1594         omap_hsmmc_set_bus_mode(host);
1595 
1596         pm_runtime_put_autosuspend(host->dev);
1597 }
1598 
1599 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1600 {
1601         struct omap_hsmmc_host *host = mmc_priv(mmc);
1602 
1603         if (!host->card_detect)
1604                 return -ENOSYS;
1605         return host->card_detect(host->dev);
1606 }
1607 
1608 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1609 {
1610         struct omap_hsmmc_host *host = mmc_priv(mmc);
1611 
1612         if (mmc_pdata(host)->init_card)
1613                 mmc_pdata(host)->init_card(card);
1614 }
1615 
1616 static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1617 {
1618         struct omap_hsmmc_host *host = mmc_priv(mmc);
1619         u32 irq_mask, con;
1620         unsigned long flags;
1621 
1622         spin_lock_irqsave(&host->irq_lock, flags);
1623 
1624         con = OMAP_HSMMC_READ(host->base, CON);
1625         irq_mask = OMAP_HSMMC_READ(host->base, ISE);
1626         if (enable) {
1627                 host->flags |= HSMMC_SDIO_IRQ_ENABLED;
1628                 irq_mask |= CIRQ_EN;
1629                 con |= CTPL | CLKEXTFREE;
1630         } else {
1631                 host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
1632                 irq_mask &= ~CIRQ_EN;
1633                 con &= ~(CTPL | CLKEXTFREE);
1634         }
1635         OMAP_HSMMC_WRITE(host->base, CON, con);
1636         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
1637 
1638         /*
1639          * if enable, piggy back detection on current request
1640          * but always disable immediately
1641          */
1642         if (!host->req_in_progress || !enable)
1643                 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
1644 
1645         /* flush posted write */
1646         OMAP_HSMMC_READ(host->base, IE);
1647 
1648         spin_unlock_irqrestore(&host->irq_lock, flags);
1649 }
1650 
1651 static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
1652 {
1653         int ret;
1654 
1655         /*
1656          * For omaps with wake-up path, wakeirq will be irq from pinctrl and
1657          * for other omaps, wakeirq will be from GPIO (dat line remuxed to
1658          * gpio). wakeirq is needed to detect sdio irq in runtime suspend state
1659          * with functional clock disabled.
1660          */
1661         if (!host->dev->of_node || !host->wake_irq)
1662                 return -ENODEV;
1663 
1664         ret = dev_pm_set_dedicated_wake_irq(host->dev, host->wake_irq);
1665         if (ret) {
1666                 dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n");
1667                 goto err;
1668         }
1669 
1670         /*
1671          * Some omaps don't have wake-up path from deeper idle states
1672          * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
1673          */
1674         if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
1675                 struct pinctrl *p = devm_pinctrl_get(host->dev);
1676                 if (!p) {
1677                         ret = -ENODEV;
1678                         goto err_free_irq;
1679                 }
1680                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {
1681                         dev_info(host->dev, "missing default pinctrl state\n");
1682                         devm_pinctrl_put(p);
1683                         ret = -EINVAL;
1684                         goto err_free_irq;
1685                 }
1686 
1687                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) {
1688                         dev_info(host->dev, "missing idle pinctrl state\n");
1689                         devm_pinctrl_put(p);
1690                         ret = -EINVAL;
1691                         goto err_free_irq;
1692                 }
1693                 devm_pinctrl_put(p);
1694         }
1695 
1696         OMAP_HSMMC_WRITE(host->base, HCTL,
1697                          OMAP_HSMMC_READ(host->base, HCTL) | IWE);
1698         return 0;
1699 
1700 err_free_irq:
1701         dev_pm_clear_wake_irq(host->dev);
1702 err:
1703         dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n");
1704         host->wake_irq = 0;
1705         return ret;
1706 }
1707 
1708 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1709 {
1710         u32 hctl, capa, value;
1711 
1712         /* Only MMC1 supports 3.0V */
1713         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1714                 hctl = SDVS30;
1715                 capa = VS30 | VS18;
1716         } else {
1717                 hctl = SDVS18;
1718                 capa = VS18;
1719         }
1720 
1721         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1722         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1723 
1724         value = OMAP_HSMMC_READ(host->base, CAPA);
1725         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1726 
1727         /* Set SD bus power bit */
1728         set_sd_bus_power(host);
1729 }
1730 
1731 static int omap_hsmmc_multi_io_quirk(struct mmc_card *card,
1732                                      unsigned int direction, int blk_size)
1733 {
1734         /* This controller can't do multiblock reads due to hw bugs */
1735         if (direction == MMC_DATA_READ)
1736                 return 1;
1737 
1738         return blk_size;
1739 }
1740 
1741 static struct mmc_host_ops omap_hsmmc_ops = {
1742         .post_req = omap_hsmmc_post_req,
1743         .pre_req = omap_hsmmc_pre_req,
1744         .request = omap_hsmmc_request,
1745         .set_ios = omap_hsmmc_set_ios,
1746         .get_cd = omap_hsmmc_get_cd,
1747         .get_ro = mmc_gpio_get_ro,
1748         .init_card = omap_hsmmc_init_card,
1749         .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
1750 };
1751 
1752 #ifdef CONFIG_DEBUG_FS
1753 
1754 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1755 {
1756         struct mmc_host *mmc = s->private;
1757         struct omap_hsmmc_host *host = mmc_priv(mmc);
1758 
1759         seq_printf(s, "mmc%d:\n", mmc->index);
1760         seq_printf(s, "sdio irq mode\t%s\n",
1761                    (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling");
1762 
1763         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1764                 seq_printf(s, "sdio irq \t%s\n",
1765                            (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?  "enabled"
1766                            : "disabled");
1767         }
1768         seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
1769 
1770         pm_runtime_get_sync(host->dev);
1771         seq_puts(s, "\nregs:\n");
1772         seq_printf(s, "CON:\t\t0x%08x\n",
1773                         OMAP_HSMMC_READ(host->base, CON));
1774         seq_printf(s, "PSTATE:\t\t0x%08x\n",
1775                    OMAP_HSMMC_READ(host->base, PSTATE));
1776         seq_printf(s, "HCTL:\t\t0x%08x\n",
1777                         OMAP_HSMMC_READ(host->base, HCTL));
1778         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1779                         OMAP_HSMMC_READ(host->base, SYSCTL));
1780         seq_printf(s, "IE:\t\t0x%08x\n",
1781                         OMAP_HSMMC_READ(host->base, IE));
1782         seq_printf(s, "ISE:\t\t0x%08x\n",
1783                         OMAP_HSMMC_READ(host->base, ISE));
1784         seq_printf(s, "CAPA:\t\t0x%08x\n",
1785                         OMAP_HSMMC_READ(host->base, CAPA));
1786 
1787         pm_runtime_mark_last_busy(host->dev);
1788         pm_runtime_put_autosuspend(host->dev);
1789 
1790         return 0;
1791 }
1792 
1793 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1794 {
1795         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1796 }
1797 
1798 static const struct file_operations mmc_regs_fops = {
1799         .open           = omap_hsmmc_regs_open,
1800         .read           = seq_read,
1801         .llseek         = seq_lseek,
1802         .release        = single_release,
1803 };
1804 
1805 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1806 {
1807         if (mmc->debugfs_root)
1808                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1809                         mmc, &mmc_regs_fops);
1810 }
1811 
1812 #else
1813 
1814 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1815 {
1816 }
1817 
1818 #endif
1819 
1820 #ifdef CONFIG_OF
1821 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
1822         /* See 35xx errata 2.1.1.128 in SPRZ278F */
1823         .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
1824 };
1825 
1826 static const struct omap_mmc_of_data omap4_mmc_of_data = {
1827         .reg_offset = 0x100,
1828 };
1829 static const struct omap_mmc_of_data am33xx_mmc_of_data = {
1830         .reg_offset = 0x100,
1831         .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING,
1832 };
1833 
1834 static const struct of_device_id omap_mmc_of_match[] = {
1835         {
1836                 .compatible = "ti,omap2-hsmmc",
1837         },
1838         {
1839                 .compatible = "ti,omap3-pre-es3-hsmmc",
1840                 .data = &omap3_pre_es3_mmc_of_data,
1841         },
1842         {
1843                 .compatible = "ti,omap3-hsmmc",
1844         },
1845         {
1846                 .compatible = "ti,omap4-hsmmc",
1847                 .data = &omap4_mmc_of_data,
1848         },
1849         {
1850                 .compatible = "ti,am33xx-hsmmc",
1851                 .data = &am33xx_mmc_of_data,
1852         },
1853         {},
1854 };
1855 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1856 
1857 static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1858 {
1859         struct omap_hsmmc_platform_data *pdata;
1860         struct device_node *np = dev->of_node;
1861 
1862         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1863         if (!pdata)
1864                 return ERR_PTR(-ENOMEM); /* out of memory */
1865 
1866         if (of_find_property(np, "ti,dual-volt", NULL))
1867                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1868 
1869         pdata->gpio_cd = -EINVAL;
1870         pdata->gpio_cod = -EINVAL;
1871         pdata->gpio_wp = -EINVAL;
1872 
1873         if (of_find_property(np, "ti,non-removable", NULL)) {
1874                 pdata->nonremovable = true;
1875                 pdata->no_regulator_off_init = true;
1876         }
1877 
1878         if (of_find_property(np, "ti,needs-special-reset", NULL))
1879                 pdata->features |= HSMMC_HAS_UPDATED_RESET;
1880 
1881         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
1882                 pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
1883 
1884         return pdata;
1885 }
1886 #else
1887 static inline struct omap_hsmmc_platform_data
1888                         *of_get_hsmmc_pdata(struct device *dev)
1889 {
1890         return ERR_PTR(-EINVAL);
1891 }
1892 #endif
1893 
1894 static int omap_hsmmc_probe(struct platform_device *pdev)
1895 {
1896         struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
1897         struct mmc_host *mmc;
1898         struct omap_hsmmc_host *host = NULL;
1899         struct resource *res;
1900         int ret, irq;
1901         const struct of_device_id *match;
1902         dma_cap_mask_t mask;
1903         unsigned tx_req, rx_req;
1904         const struct omap_mmc_of_data *data;
1905         void __iomem *base;
1906 
1907         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
1908         if (match) {
1909                 pdata = of_get_hsmmc_pdata(&pdev->dev);
1910 
1911                 if (IS_ERR(pdata))
1912                         return PTR_ERR(pdata);
1913 
1914                 if (match->data) {
1915                         data = match->data;
1916                         pdata->reg_offset = data->reg_offset;
1917                         pdata->controller_flags |= data->controller_flags;
1918                 }
1919         }
1920 
1921         if (pdata == NULL) {
1922                 dev_err(&pdev->dev, "Platform Data is missing\n");
1923                 return -ENXIO;
1924         }
1925 
1926         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1927         irq = platform_get_irq(pdev, 0);
1928         if (res == NULL || irq < 0)
1929                 return -ENXIO;
1930 
1931         base = devm_ioremap_resource(&pdev->dev, res);
1932         if (IS_ERR(base))
1933                 return PTR_ERR(base);
1934 
1935         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1936         if (!mmc) {
1937                 ret = -ENOMEM;
1938                 goto err;
1939         }
1940 
1941         ret = mmc_of_parse(mmc);
1942         if (ret)
1943                 goto err1;
1944 
1945         host            = mmc_priv(mmc);
1946         host->mmc       = mmc;
1947         host->pdata     = pdata;
1948         host->dev       = &pdev->dev;
1949         host->use_dma   = 1;
1950         host->dma_ch    = -1;
1951         host->irq       = irq;
1952         host->mapbase   = res->start + pdata->reg_offset;
1953         host->base      = base + pdata->reg_offset;
1954         host->power_mode = MMC_POWER_OFF;
1955         host->next_data.cookie = 1;
1956         host->pbias_enabled = 0;
1957 
1958         ret = omap_hsmmc_gpio_init(mmc, host, pdata);
1959         if (ret)
1960                 goto err_gpio;
1961 
1962         platform_set_drvdata(pdev, host);
1963 
1964         if (pdev->dev.of_node)
1965                 host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1966 
1967         mmc->ops        = &omap_hsmmc_ops;
1968 
1969         mmc->f_min = OMAP_MMC_MIN_CLOCK;
1970 
1971         if (pdata->max_freq > 0)
1972                 mmc->f_max = pdata->max_freq;
1973         else if (mmc->f_max == 0)
1974                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
1975 
1976         spin_lock_init(&host->irq_lock);
1977 
1978         host->fclk = devm_clk_get(&pdev->dev, "fck");
1979         if (IS_ERR(host->fclk)) {
1980                 ret = PTR_ERR(host->fclk);
1981                 host->fclk = NULL;
1982                 goto err1;
1983         }
1984 
1985         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
1986                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
1987                 omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
1988         }
1989 
1990         device_init_wakeup(&pdev->dev, true);
1991         pm_runtime_enable(host->dev);
1992         pm_runtime_get_sync(host->dev);
1993         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
1994         pm_runtime_use_autosuspend(host->dev);
1995 
1996         omap_hsmmc_context_save(host);
1997 
1998         host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck");
1999         /*
2000          * MMC can still work without debounce clock.
2001          */
2002         if (IS_ERR(host->dbclk)) {
2003                 host->dbclk = NULL;
2004         } else if (clk_prepare_enable(host->dbclk) != 0) {
2005                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
2006                 host->dbclk = NULL;
2007         }
2008 
2009         /* Since we do only SG emulation, we can have as many segs
2010          * as we want. */
2011         mmc->max_segs = 1024;
2012 
2013         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
2014         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
2015         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2016         mmc->max_seg_size = mmc->max_req_size;
2017 
2018         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2019                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2020 
2021         mmc->caps |= mmc_pdata(host)->caps;
2022         if (mmc->caps & MMC_CAP_8_BIT_DATA)
2023                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2024 
2025         if (mmc_pdata(host)->nonremovable)
2026                 mmc->caps |= MMC_CAP_NONREMOVABLE;
2027 
2028         mmc->pm_caps |= mmc_pdata(host)->pm_caps;
2029 
2030         omap_hsmmc_conf_bus_power(host);
2031 
2032         if (!pdev->dev.of_node) {
2033                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
2034                 if (!res) {
2035                         dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
2036                         ret = -ENXIO;
2037                         goto err_irq;
2038                 }
2039                 tx_req = res->start;
2040 
2041                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
2042                 if (!res) {
2043                         dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
2044                         ret = -ENXIO;
2045                         goto err_irq;
2046                 }
2047                 rx_req = res->start;
2048         }
2049 
2050         dma_cap_zero(mask);
2051         dma_cap_set(DMA_SLAVE, mask);
2052 
2053         host->rx_chan =
2054                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2055                                                  &rx_req, &pdev->dev, "rx");
2056 
2057         if (!host->rx_chan) {
2058                 dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
2059                 ret = -ENXIO;
2060                 goto err_irq;
2061         }
2062 
2063         host->tx_chan =
2064                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2065                                                  &tx_req, &pdev->dev, "tx");
2066 
2067         if (!host->tx_chan) {
2068                 dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
2069                 ret = -ENXIO;
2070                 goto err_irq;
2071         }
2072 
2073         /* Request IRQ for MMC operations */
2074         ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
2075                         mmc_hostname(mmc), host);
2076         if (ret) {
2077                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2078                 goto err_irq;
2079         }
2080 
2081         if (omap_hsmmc_have_reg() && !mmc_pdata(host)->set_power) {
2082                 ret = omap_hsmmc_reg_get(host);
2083                 if (ret)
2084                         goto err_irq;
2085                 host->use_reg = 1;
2086         }
2087 
2088         mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
2089 
2090         omap_hsmmc_disable_irq(host);
2091 
2092         /*
2093          * For now, only support SDIO interrupt if we have a separate
2094          * wake-up interrupt configured from device tree. This is because
2095          * the wake-up interrupt is needed for idle state and some
2096          * platforms need special quirks. And we don't want to add new
2097          * legacy mux platform init code callbacks any longer as we
2098          * are moving to DT based booting anyways.
2099          */
2100         ret = omap_hsmmc_configure_wake_irq(host);
2101         if (!ret)
2102                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2103 
2104         omap_hsmmc_protect_card(host);
2105 
2106         mmc_add_host(mmc);
2107 
2108         if (mmc_pdata(host)->name != NULL) {
2109                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2110                 if (ret < 0)
2111                         goto err_slot_name;
2112         }
2113         if (host->get_cover_state) {
2114                 ret = device_create_file(&mmc->class_dev,
2115                                          &dev_attr_cover_switch);
2116                 if (ret < 0)
2117                         goto err_slot_name;
2118         }
2119 
2120         omap_hsmmc_debugfs(mmc);
2121         pm_runtime_mark_last_busy(host->dev);
2122         pm_runtime_put_autosuspend(host->dev);
2123 
2124         return 0;
2125 
2126 err_slot_name:
2127         mmc_remove_host(mmc);
2128         if (host->use_reg)
2129                 omap_hsmmc_reg_put(host);
2130 err_irq:
2131         device_init_wakeup(&pdev->dev, false);
2132         if (host->tx_chan)
2133                 dma_release_channel(host->tx_chan);
2134         if (host->rx_chan)
2135                 dma_release_channel(host->rx_chan);
2136         pm_runtime_put_sync(host->dev);
2137         pm_runtime_disable(host->dev);
2138         if (host->dbclk)
2139                 clk_disable_unprepare(host->dbclk);
2140 err1:
2141 err_gpio:
2142         mmc_free_host(mmc);
2143 err:
2144         return ret;
2145 }
2146 
2147 static int omap_hsmmc_remove(struct platform_device *pdev)
2148 {
2149         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2150 
2151         pm_runtime_get_sync(host->dev);
2152         mmc_remove_host(host->mmc);
2153         if (host->use_reg)
2154                 omap_hsmmc_reg_put(host);
2155 
2156         if (host->tx_chan)
2157                 dma_release_channel(host->tx_chan);
2158         if (host->rx_chan)
2159                 dma_release_channel(host->rx_chan);
2160 
2161         pm_runtime_put_sync(host->dev);
2162         pm_runtime_disable(host->dev);
2163         device_init_wakeup(&pdev->dev, false);
2164         if (host->dbclk)
2165                 clk_disable_unprepare(host->dbclk);
2166 
2167         mmc_free_host(host->mmc);
2168 
2169         return 0;
2170 }
2171 
2172 #ifdef CONFIG_PM_SLEEP
2173 static int omap_hsmmc_suspend(struct device *dev)
2174 {
2175         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2176 
2177         if (!host)
2178                 return 0;
2179 
2180         pm_runtime_get_sync(host->dev);
2181 
2182         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2183                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2184                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2185                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2186                 OMAP_HSMMC_WRITE(host->base, HCTL,
2187                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2188         }
2189 
2190         if (host->dbclk)
2191                 clk_disable_unprepare(host->dbclk);
2192 
2193         pm_runtime_put_sync(host->dev);
2194         return 0;
2195 }
2196 
2197 /* Routine to resume the MMC device */
2198 static int omap_hsmmc_resume(struct device *dev)
2199 {
2200         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2201 
2202         if (!host)
2203                 return 0;
2204 
2205         pm_runtime_get_sync(host->dev);
2206 
2207         if (host->dbclk)
2208                 clk_prepare_enable(host->dbclk);
2209 
2210         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2211                 omap_hsmmc_conf_bus_power(host);
2212 
2213         omap_hsmmc_protect_card(host);
2214         pm_runtime_mark_last_busy(host->dev);
2215         pm_runtime_put_autosuspend(host->dev);
2216         return 0;
2217 }
2218 #endif
2219 
2220 static int omap_hsmmc_runtime_suspend(struct device *dev)
2221 {
2222         struct omap_hsmmc_host *host;
2223         unsigned long flags;
2224         int ret = 0;
2225 
2226         host = platform_get_drvdata(to_platform_device(dev));
2227         omap_hsmmc_context_save(host);
2228         dev_dbg(dev, "disabled\n");
2229 
2230         spin_lock_irqsave(&host->irq_lock, flags);
2231         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2232             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2233                 /* disable sdio irq handling to prevent race */
2234                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2235                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2236 
2237                 if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) {
2238                         /*
2239                          * dat1 line low, pending sdio irq
2240                          * race condition: possible irq handler running on
2241                          * multi-core, abort
2242                          */
2243                         dev_dbg(dev, "pending sdio irq, abort suspend\n");
2244                         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2245                         OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2246                         OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2247                         pm_runtime_mark_last_busy(dev);
2248                         ret = -EBUSY;
2249                         goto abort;
2250                 }
2251 
2252                 pinctrl_pm_select_idle_state(dev);
2253         } else {
2254                 pinctrl_pm_select_idle_state(dev);
2255         }
2256 
2257 abort:
2258         spin_unlock_irqrestore(&host->irq_lock, flags);
2259         return ret;
2260 }
2261 
2262 static int omap_hsmmc_runtime_resume(struct device *dev)
2263 {
2264         struct omap_hsmmc_host *host;
2265         unsigned long flags;
2266 
2267         host = platform_get_drvdata(to_platform_device(dev));
2268         omap_hsmmc_context_restore(host);
2269         dev_dbg(dev, "enabled\n");
2270 
2271         spin_lock_irqsave(&host->irq_lock, flags);
2272         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2273             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2274 
2275                 pinctrl_pm_select_default_state(host->dev);
2276 
2277                 /* irq lost, if pinmux incorrect */
2278                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2279                 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2280                 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2281         } else {
2282                 pinctrl_pm_select_default_state(host->dev);
2283         }
2284         spin_unlock_irqrestore(&host->irq_lock, flags);
2285         return 0;
2286 }
2287 
2288 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2289         SET_SYSTEM_SLEEP_PM_OPS(omap_hsmmc_suspend, omap_hsmmc_resume)
2290         .runtime_suspend = omap_hsmmc_runtime_suspend,
2291         .runtime_resume = omap_hsmmc_runtime_resume,
2292 };
2293 
2294 static struct platform_driver omap_hsmmc_driver = {
2295         .probe          = omap_hsmmc_probe,
2296         .remove         = omap_hsmmc_remove,
2297         .driver         = {
2298                 .name = DRIVER_NAME,
2299                 .pm = &omap_hsmmc_dev_pm_ops,
2300                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2301         },
2302 };
2303 
2304 module_platform_driver(omap_hsmmc_driver);
2305 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2306 MODULE_LICENSE("GPL");
2307 MODULE_ALIAS("platform:" DRIVER_NAME);
2308 MODULE_AUTHOR("Texas Instruments Inc");
2309 

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