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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         struct  regulator       *pbias;
185         bool                    pbias_enabled;
186         void    __iomem         *base;
187         int                     vqmmc_enabled;
188         resource_size_t         mapbase;
189         spinlock_t              irq_lock; /* Prevent races with irq handler */
190         unsigned int            dma_len;
191         unsigned int            dma_sg_idx;
192         unsigned char           bus_mode;
193         unsigned char           power_mode;
194         int                     suspended;
195         u32                     con;
196         u32                     hctl;
197         u32                     sysctl;
198         u32                     capa;
199         int                     irq;
200         int                     wake_irq;
201         int                     use_dma, dma_ch;
202         struct dma_chan         *tx_chan;
203         struct dma_chan         *rx_chan;
204         int                     response_busy;
205         int                     context_loss;
206         int                     protect_card;
207         int                     reqs_blocked;
208         int                     req_in_progress;
209         unsigned long           clk_rate;
210         unsigned int            flags;
211 #define AUTO_CMD23              (1 << 0)        /* Auto CMD23 support */
212 #define HSMMC_SDIO_IRQ_ENABLED  (1 << 1)        /* SDIO irq enabled */
213         struct omap_hsmmc_next  next_data;
214         struct  omap_hsmmc_platform_data        *pdata;
215 
216         /* return MMC cover switch state, can be NULL if not supported.
217          *
218          * possible return values:
219          *   0 - closed
220          *   1 - open
221          */
222         int (*get_cover_state)(struct device *dev);
223 
224         int (*card_detect)(struct device *dev);
225 };
226 
227 struct omap_mmc_of_data {
228         u32 reg_offset;
229         u8 controller_flags;
230 };
231 
232 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
233 
234 static int omap_hsmmc_card_detect(struct device *dev)
235 {
236         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
237 
238         return mmc_gpio_get_cd(host->mmc);
239 }
240 
241 static int omap_hsmmc_get_cover_state(struct device *dev)
242 {
243         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
244 
245         return mmc_gpio_get_cd(host->mmc);
246 }
247 
248 static int omap_hsmmc_enable_supply(struct mmc_host *mmc)
249 {
250         int ret;
251         struct omap_hsmmc_host *host = mmc_priv(mmc);
252         struct mmc_ios *ios = &mmc->ios;
253 
254         if (mmc->supply.vmmc) {
255                 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
256                 if (ret)
257                         return ret;
258         }
259 
260         /* Enable interface voltage rail, if needed */
261         if (mmc->supply.vqmmc && !host->vqmmc_enabled) {
262                 ret = regulator_enable(mmc->supply.vqmmc);
263                 if (ret) {
264                         dev_err(mmc_dev(mmc), "vmmc_aux reg enable failed\n");
265                         goto err_vqmmc;
266                 }
267                 host->vqmmc_enabled = 1;
268         }
269 
270         return 0;
271 
272 err_vqmmc:
273         if (mmc->supply.vmmc)
274                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
275 
276         return ret;
277 }
278 
279 static int omap_hsmmc_disable_supply(struct mmc_host *mmc)
280 {
281         int ret;
282         int status;
283         struct omap_hsmmc_host *host = mmc_priv(mmc);
284 
285         if (mmc->supply.vqmmc && host->vqmmc_enabled) {
286                 ret = regulator_disable(mmc->supply.vqmmc);
287                 if (ret) {
288                         dev_err(mmc_dev(mmc), "vmmc_aux reg disable failed\n");
289                         return ret;
290                 }
291                 host->vqmmc_enabled = 0;
292         }
293 
294         if (mmc->supply.vmmc) {
295                 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
296                 if (ret)
297                         goto err_set_ocr;
298         }
299 
300         return 0;
301 
302 err_set_ocr:
303         if (mmc->supply.vqmmc) {
304                 status = regulator_enable(mmc->supply.vqmmc);
305                 if (status)
306                         dev_err(mmc_dev(mmc), "vmmc_aux re-enable failed\n");
307         }
308 
309         return ret;
310 }
311 
312 static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on,
313                                 int vdd)
314 {
315         int ret;
316 
317         if (!host->pbias)
318                 return 0;
319 
320         if (power_on) {
321                 if (vdd <= VDD_165_195)
322                         ret = regulator_set_voltage(host->pbias, VDD_1V8,
323                                                     VDD_1V8);
324                 else
325                         ret = regulator_set_voltage(host->pbias, VDD_3V0,
326                                                     VDD_3V0);
327                 if (ret < 0) {
328                         dev_err(host->dev, "pbias set voltage fail\n");
329                         return ret;
330                 }
331 
332                 if (host->pbias_enabled == 0) {
333                         ret = regulator_enable(host->pbias);
334                         if (ret) {
335                                 dev_err(host->dev, "pbias reg enable fail\n");
336                                 return ret;
337                         }
338                         host->pbias_enabled = 1;
339                 }
340         } else {
341                 if (host->pbias_enabled == 1) {
342                         ret = regulator_disable(host->pbias);
343                         if (ret) {
344                                 dev_err(host->dev, "pbias reg disable fail\n");
345                                 return ret;
346                         }
347                         host->pbias_enabled = 0;
348                 }
349         }
350 
351         return 0;
352 }
353 
354 static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
355 {
356         struct omap_hsmmc_host *host =
357                 platform_get_drvdata(to_platform_device(dev));
358         struct mmc_host *mmc = host->mmc;
359         int ret = 0;
360 
361         if (mmc_pdata(host)->set_power)
362                 return mmc_pdata(host)->set_power(dev, power_on, vdd);
363 
364         /*
365          * If we don't see a Vcc regulator, assume it's a fixed
366          * voltage always-on regulator.
367          */
368         if (!mmc->supply.vmmc)
369                 return 0;
370 
371         if (mmc_pdata(host)->before_set_reg)
372                 mmc_pdata(host)->before_set_reg(dev, power_on, vdd);
373 
374         ret = omap_hsmmc_set_pbias(host, false, 0);
375         if (ret)
376                 return ret;
377 
378         /*
379          * Assume Vcc regulator is used only to power the card ... OMAP
380          * VDDS is used to power the pins, optionally with a transceiver to
381          * support cards using voltages other than VDDS (1.8V nominal).  When a
382          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
383          *
384          * In some cases this regulator won't support enable/disable;
385          * e.g. it's a fixed rail for a WLAN chip.
386          *
387          * In other cases vcc_aux switches interface power.  Example, for
388          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
389          * chips/cards need an interface voltage rail too.
390          */
391         if (power_on) {
392                 ret = omap_hsmmc_enable_supply(mmc);
393                 if (ret)
394                         return ret;
395 
396                 ret = omap_hsmmc_set_pbias(host, true, vdd);
397                 if (ret)
398                         goto err_set_voltage;
399         } else {
400                 ret = omap_hsmmc_disable_supply(mmc);
401                 if (ret)
402                         return ret;
403         }
404 
405         if (mmc_pdata(host)->after_set_reg)
406                 mmc_pdata(host)->after_set_reg(dev, power_on, vdd);
407 
408         return 0;
409 
410 err_set_voltage:
411         omap_hsmmc_disable_supply(mmc);
412 
413         return ret;
414 }
415 
416 static int omap_hsmmc_disable_boot_regulator(struct regulator *reg)
417 {
418         int ret;
419 
420         if (!reg)
421                 return 0;
422 
423         if (regulator_is_enabled(reg)) {
424                 ret = regulator_enable(reg);
425                 if (ret)
426                         return ret;
427 
428                 ret = regulator_disable(reg);
429                 if (ret)
430                         return ret;
431         }
432 
433         return 0;
434 }
435 
436 static int omap_hsmmc_disable_boot_regulators(struct omap_hsmmc_host *host)
437 {
438         struct mmc_host *mmc = host->mmc;
439         int ret;
440 
441         /*
442          * disable regulators enabled during boot and get the usecount
443          * right so that regulators can be enabled/disabled by checking
444          * the return value of regulator_is_enabled
445          */
446         ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vmmc);
447         if (ret) {
448                 dev_err(host->dev, "fail to disable boot enabled vmmc reg\n");
449                 return ret;
450         }
451 
452         ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vqmmc);
453         if (ret) {
454                 dev_err(host->dev,
455                         "fail to disable boot enabled vmmc_aux reg\n");
456                 return ret;
457         }
458 
459         ret = omap_hsmmc_disable_boot_regulator(host->pbias);
460         if (ret) {
461                 dev_err(host->dev,
462                         "failed to disable boot enabled pbias reg\n");
463                 return ret;
464         }
465 
466         return 0;
467 }
468 
469 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
470 {
471         int ocr_value = 0;
472         int ret;
473         struct mmc_host *mmc = host->mmc;
474 
475         if (mmc_pdata(host)->set_power)
476                 return 0;
477 
478         mmc->supply.vmmc = devm_regulator_get_optional(host->dev, "vmmc");
479         if (IS_ERR(mmc->supply.vmmc)) {
480                 ret = PTR_ERR(mmc->supply.vmmc);
481                 if ((ret != -ENODEV) && host->dev->of_node)
482                         return ret;
483                 dev_dbg(host->dev, "unable to get vmmc regulator %ld\n",
484                         PTR_ERR(mmc->supply.vmmc));
485                 mmc->supply.vmmc = NULL;
486         } else {
487                 ocr_value = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
488                 if (ocr_value > 0)
489                         mmc_pdata(host)->ocr_mask = ocr_value;
490         }
491 
492         /* Allow an aux regulator */
493         mmc->supply.vqmmc = devm_regulator_get_optional(host->dev, "vmmc_aux");
494         if (IS_ERR(mmc->supply.vqmmc)) {
495                 ret = PTR_ERR(mmc->supply.vqmmc);
496                 if ((ret != -ENODEV) && host->dev->of_node)
497                         return ret;
498                 dev_dbg(host->dev, "unable to get vmmc_aux regulator %ld\n",
499                         PTR_ERR(mmc->supply.vqmmc));
500                 mmc->supply.vqmmc = NULL;
501         }
502 
503         host->pbias = devm_regulator_get_optional(host->dev, "pbias");
504         if (IS_ERR(host->pbias)) {
505                 ret = PTR_ERR(host->pbias);
506                 if ((ret != -ENODEV) && host->dev->of_node) {
507                         dev_err(host->dev,
508                         "SD card detect fail? enable CONFIG_REGULATOR_PBIAS\n");
509                         return ret;
510                 }
511                 dev_dbg(host->dev, "unable to get pbias regulator %ld\n",
512                         PTR_ERR(host->pbias));
513                 host->pbias = NULL;
514         }
515 
516         /* For eMMC do not power off when not in sleep state */
517         if (mmc_pdata(host)->no_regulator_off_init)
518                 return 0;
519 
520         ret = omap_hsmmc_disable_boot_regulators(host);
521         if (ret)
522                 return ret;
523 
524         return 0;
525 }
526 
527 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id);
528 
529 static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
530                                 struct omap_hsmmc_host *host,
531                                 struct omap_hsmmc_platform_data *pdata)
532 {
533         int ret;
534 
535         if (gpio_is_valid(pdata->gpio_cod)) {
536                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cod, 0);
537                 if (ret)
538                         return ret;
539 
540                 host->get_cover_state = omap_hsmmc_get_cover_state;
541                 mmc_gpio_set_cd_isr(mmc, omap_hsmmc_cover_irq);
542         } else if (gpio_is_valid(pdata->gpio_cd)) {
543                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0);
544                 if (ret)
545                         return ret;
546 
547                 host->card_detect = omap_hsmmc_card_detect;
548         }
549 
550         if (gpio_is_valid(pdata->gpio_wp)) {
551                 ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
552                 if (ret)
553                         return ret;
554         }
555 
556         return 0;
557 }
558 
559 /*
560  * Start clock to the card
561  */
562 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
563 {
564         OMAP_HSMMC_WRITE(host->base, SYSCTL,
565                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
566 }
567 
568 /*
569  * Stop clock to the card
570  */
571 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
572 {
573         OMAP_HSMMC_WRITE(host->base, SYSCTL,
574                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
575         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
576                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
577 }
578 
579 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
580                                   struct mmc_command *cmd)
581 {
582         u32 irq_mask = INT_EN_MASK;
583         unsigned long flags;
584 
585         if (host->use_dma)
586                 irq_mask &= ~(BRR_EN | BWR_EN);
587 
588         /* Disable timeout for erases */
589         if (cmd->opcode == MMC_ERASE)
590                 irq_mask &= ~DTO_EN;
591 
592         spin_lock_irqsave(&host->irq_lock, flags);
593         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
594         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
595 
596         /* latch pending CIRQ, but don't signal MMC core */
597         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
598                 irq_mask |= CIRQ_EN;
599         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
600         spin_unlock_irqrestore(&host->irq_lock, flags);
601 }
602 
603 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
604 {
605         u32 irq_mask = 0;
606         unsigned long flags;
607 
608         spin_lock_irqsave(&host->irq_lock, flags);
609         /* no transfer running but need to keep cirq if enabled */
610         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
611                 irq_mask |= CIRQ_EN;
612         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
613         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
614         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
615         spin_unlock_irqrestore(&host->irq_lock, flags);
616 }
617 
618 /* Calculate divisor for the given clock frequency */
619 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
620 {
621         u16 dsor = 0;
622 
623         if (ios->clock) {
624                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
625                 if (dsor > CLKD_MAX)
626                         dsor = CLKD_MAX;
627         }
628 
629         return dsor;
630 }
631 
632 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
633 {
634         struct mmc_ios *ios = &host->mmc->ios;
635         unsigned long regval;
636         unsigned long timeout;
637         unsigned long clkdiv;
638 
639         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
640 
641         omap_hsmmc_stop_clock(host);
642 
643         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
644         regval = regval & ~(CLKD_MASK | DTO_MASK);
645         clkdiv = calc_divisor(host, ios);
646         regval = regval | (clkdiv << 6) | (DTO << 16);
647         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
648         OMAP_HSMMC_WRITE(host->base, SYSCTL,
649                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
650 
651         /* Wait till the ICS bit is set */
652         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
653         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
654                 && time_before(jiffies, timeout))
655                 cpu_relax();
656 
657         /*
658          * Enable High-Speed Support
659          * Pre-Requisites
660          *      - Controller should support High-Speed-Enable Bit
661          *      - Controller should not be using DDR Mode
662          *      - Controller should advertise that it supports High Speed
663          *        in capabilities register
664          *      - MMC/SD clock coming out of controller > 25MHz
665          */
666         if ((mmc_pdata(host)->features & HSMMC_HAS_HSPE_SUPPORT) &&
667             (ios->timing != MMC_TIMING_MMC_DDR52) &&
668             (ios->timing != MMC_TIMING_UHS_DDR50) &&
669             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
670                 regval = OMAP_HSMMC_READ(host->base, HCTL);
671                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
672                         regval |= HSPE;
673                 else
674                         regval &= ~HSPE;
675 
676                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
677         }
678 
679         omap_hsmmc_start_clock(host);
680 }
681 
682 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
683 {
684         struct mmc_ios *ios = &host->mmc->ios;
685         u32 con;
686 
687         con = OMAP_HSMMC_READ(host->base, CON);
688         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
689             ios->timing == MMC_TIMING_UHS_DDR50)
690                 con |= DDR;     /* configure in DDR mode */
691         else
692                 con &= ~DDR;
693         switch (ios->bus_width) {
694         case MMC_BUS_WIDTH_8:
695                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
696                 break;
697         case MMC_BUS_WIDTH_4:
698                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
699                 OMAP_HSMMC_WRITE(host->base, HCTL,
700                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
701                 break;
702         case MMC_BUS_WIDTH_1:
703                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
704                 OMAP_HSMMC_WRITE(host->base, HCTL,
705                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
706                 break;
707         }
708 }
709 
710 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
711 {
712         struct mmc_ios *ios = &host->mmc->ios;
713         u32 con;
714 
715         con = OMAP_HSMMC_READ(host->base, CON);
716         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
717                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
718         else
719                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
720 }
721 
722 #ifdef CONFIG_PM
723 
724 /*
725  * Restore the MMC host context, if it was lost as result of a
726  * power state change.
727  */
728 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
729 {
730         struct mmc_ios *ios = &host->mmc->ios;
731         u32 hctl, capa;
732         unsigned long timeout;
733 
734         if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
735             host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
736             host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
737             host->capa == OMAP_HSMMC_READ(host->base, CAPA))
738                 return 0;
739 
740         host->context_loss++;
741 
742         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
743                 if (host->power_mode != MMC_POWER_OFF &&
744                     (1 << ios->vdd) <= MMC_VDD_23_24)
745                         hctl = SDVS18;
746                 else
747                         hctl = SDVS30;
748                 capa = VS30 | VS18;
749         } else {
750                 hctl = SDVS18;
751                 capa = VS18;
752         }
753 
754         if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
755                 hctl |= IWE;
756 
757         OMAP_HSMMC_WRITE(host->base, HCTL,
758                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
759 
760         OMAP_HSMMC_WRITE(host->base, CAPA,
761                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
762 
763         OMAP_HSMMC_WRITE(host->base, HCTL,
764                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
765 
766         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
767         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
768                 && time_before(jiffies, timeout))
769                 ;
770 
771         OMAP_HSMMC_WRITE(host->base, ISE, 0);
772         OMAP_HSMMC_WRITE(host->base, IE, 0);
773         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
774 
775         /* Do not initialize card-specific things if the power is off */
776         if (host->power_mode == MMC_POWER_OFF)
777                 goto out;
778 
779         omap_hsmmc_set_bus_width(host);
780 
781         omap_hsmmc_set_clock(host);
782 
783         omap_hsmmc_set_bus_mode(host);
784 
785 out:
786         dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
787                 host->context_loss);
788         return 0;
789 }
790 
791 /*
792  * Save the MMC host context (store the number of power state changes so far).
793  */
794 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
795 {
796         host->con =  OMAP_HSMMC_READ(host->base, CON);
797         host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
798         host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
799         host->capa = OMAP_HSMMC_READ(host->base, CAPA);
800 }
801 
802 #else
803 
804 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
805 {
806         return 0;
807 }
808 
809 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
810 {
811 }
812 
813 #endif
814 
815 /*
816  * Send init stream sequence to card
817  * before sending IDLE command
818  */
819 static void send_init_stream(struct omap_hsmmc_host *host)
820 {
821         int reg = 0;
822         unsigned long timeout;
823 
824         if (host->protect_card)
825                 return;
826 
827         disable_irq(host->irq);
828 
829         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
830         OMAP_HSMMC_WRITE(host->base, CON,
831                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
832         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
833 
834         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
835         while ((reg != CC_EN) && time_before(jiffies, timeout))
836                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
837 
838         OMAP_HSMMC_WRITE(host->base, CON,
839                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
840 
841         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
842         OMAP_HSMMC_READ(host->base, STAT);
843 
844         enable_irq(host->irq);
845 }
846 
847 static inline
848 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
849 {
850         int r = 1;
851 
852         if (host->get_cover_state)
853                 r = host->get_cover_state(host->dev);
854         return r;
855 }
856 
857 static ssize_t
858 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
859                            char *buf)
860 {
861         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
862         struct omap_hsmmc_host *host = mmc_priv(mmc);
863 
864         return sprintf(buf, "%s\n",
865                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
866 }
867 
868 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
869 
870 static ssize_t
871 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
872                         char *buf)
873 {
874         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
875         struct omap_hsmmc_host *host = mmc_priv(mmc);
876 
877         return sprintf(buf, "%s\n", mmc_pdata(host)->name);
878 }
879 
880 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
881 
882 /*
883  * Configure the response type and send the cmd.
884  */
885 static void
886 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
887         struct mmc_data *data)
888 {
889         int cmdreg = 0, resptype = 0, cmdtype = 0;
890 
891         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
892                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
893         host->cmd = cmd;
894 
895         omap_hsmmc_enable_irq(host, cmd);
896 
897         host->response_busy = 0;
898         if (cmd->flags & MMC_RSP_PRESENT) {
899                 if (cmd->flags & MMC_RSP_136)
900                         resptype = 1;
901                 else if (cmd->flags & MMC_RSP_BUSY) {
902                         resptype = 3;
903                         host->response_busy = 1;
904                 } else
905                         resptype = 2;
906         }
907 
908         /*
909          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
910          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
911          * a val of 0x3, rest 0x0.
912          */
913         if (cmd == host->mrq->stop)
914                 cmdtype = 0x3;
915 
916         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
917 
918         if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
919             host->mrq->sbc) {
920                 cmdreg |= ACEN_ACMD23;
921                 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
922         }
923         if (data) {
924                 cmdreg |= DP_SELECT | MSBS | BCE;
925                 if (data->flags & MMC_DATA_READ)
926                         cmdreg |= DDIR;
927                 else
928                         cmdreg &= ~(DDIR);
929         }
930 
931         if (host->use_dma)
932                 cmdreg |= DMAE;
933 
934         host->req_in_progress = 1;
935 
936         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
937         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
938 }
939 
940 static int
941 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
942 {
943         if (data->flags & MMC_DATA_WRITE)
944                 return DMA_TO_DEVICE;
945         else
946                 return DMA_FROM_DEVICE;
947 }
948 
949 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
950         struct mmc_data *data)
951 {
952         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
953 }
954 
955 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
956 {
957         int dma_ch;
958         unsigned long flags;
959 
960         spin_lock_irqsave(&host->irq_lock, flags);
961         host->req_in_progress = 0;
962         dma_ch = host->dma_ch;
963         spin_unlock_irqrestore(&host->irq_lock, flags);
964 
965         omap_hsmmc_disable_irq(host);
966         /* Do not complete the request if DMA is still in progress */
967         if (mrq->data && host->use_dma && dma_ch != -1)
968                 return;
969         host->mrq = NULL;
970         mmc_request_done(host->mmc, mrq);
971         pm_runtime_mark_last_busy(host->dev);
972         pm_runtime_put_autosuspend(host->dev);
973 }
974 
975 /*
976  * Notify the transfer complete to MMC core
977  */
978 static void
979 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
980 {
981         if (!data) {
982                 struct mmc_request *mrq = host->mrq;
983 
984                 /* TC before CC from CMD6 - don't know why, but it happens */
985                 if (host->cmd && host->cmd->opcode == 6 &&
986                     host->response_busy) {
987                         host->response_busy = 0;
988                         return;
989                 }
990 
991                 omap_hsmmc_request_done(host, mrq);
992                 return;
993         }
994 
995         host->data = NULL;
996 
997         if (!data->error)
998                 data->bytes_xfered += data->blocks * (data->blksz);
999         else
1000                 data->bytes_xfered = 0;
1001 
1002         if (data->stop && (data->error || !host->mrq->sbc))
1003                 omap_hsmmc_start_command(host, data->stop, NULL);
1004         else
1005                 omap_hsmmc_request_done(host, data->mrq);
1006 }
1007 
1008 /*
1009  * Notify the core about command completion
1010  */
1011 static void
1012 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
1013 {
1014         if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
1015             !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
1016                 host->cmd = NULL;
1017                 omap_hsmmc_start_dma_transfer(host);
1018                 omap_hsmmc_start_command(host, host->mrq->cmd,
1019                                                 host->mrq->data);
1020                 return;
1021         }
1022 
1023         host->cmd = NULL;
1024 
1025         if (cmd->flags & MMC_RSP_PRESENT) {
1026                 if (cmd->flags & MMC_RSP_136) {
1027                         /* response type 2 */
1028                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
1029                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
1030                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
1031                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
1032                 } else {
1033                         /* response types 1, 1b, 3, 4, 5, 6 */
1034                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
1035                 }
1036         }
1037         if ((host->data == NULL && !host->response_busy) || cmd->error)
1038                 omap_hsmmc_request_done(host, host->mrq);
1039 }
1040 
1041 /*
1042  * DMA clean up for command errors
1043  */
1044 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
1045 {
1046         int dma_ch;
1047         unsigned long flags;
1048 
1049         host->data->error = errno;
1050 
1051         spin_lock_irqsave(&host->irq_lock, flags);
1052         dma_ch = host->dma_ch;
1053         host->dma_ch = -1;
1054         spin_unlock_irqrestore(&host->irq_lock, flags);
1055 
1056         if (host->use_dma && dma_ch != -1) {
1057                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
1058 
1059                 dmaengine_terminate_all(chan);
1060                 dma_unmap_sg(chan->device->dev,
1061                         host->data->sg, host->data->sg_len,
1062                         omap_hsmmc_get_dma_dir(host, host->data));
1063 
1064                 host->data->host_cookie = 0;
1065         }
1066         host->data = NULL;
1067 }
1068 
1069 /*
1070  * Readable error output
1071  */
1072 #ifdef CONFIG_MMC_DEBUG
1073 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
1074 {
1075         /* --- means reserved bit without definition at documentation */
1076         static const char *omap_hsmmc_status_bits[] = {
1077                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
1078                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
1079                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
1080                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
1081         };
1082         char res[256];
1083         char *buf = res;
1084         int len, i;
1085 
1086         len = sprintf(buf, "MMC IRQ 0x%x :", status);
1087         buf += len;
1088 
1089         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
1090                 if (status & (1 << i)) {
1091                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1092                         buf += len;
1093                 }
1094 
1095         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
1096 }
1097 #else
1098 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1099                                              u32 status)
1100 {
1101 }
1102 #endif  /* CONFIG_MMC_DEBUG */
1103 
1104 /*
1105  * MMC controller internal state machines reset
1106  *
1107  * Used to reset command or data internal state machines, using respectively
1108  *  SRC or SRD bit of SYSCTL register
1109  * Can be called from interrupt context
1110  */
1111 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1112                                                    unsigned long bit)
1113 {
1114         unsigned long i = 0;
1115         unsigned long limit = MMC_TIMEOUT_US;
1116 
1117         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1118                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1119 
1120         /*
1121          * OMAP4 ES2 and greater has an updated reset logic.
1122          * Monitor a 0->1 transition first
1123          */
1124         if (mmc_pdata(host)->features & HSMMC_HAS_UPDATED_RESET) {
1125                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1126                                         && (i++ < limit))
1127                         udelay(1);
1128         }
1129         i = 0;
1130 
1131         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1132                 (i++ < limit))
1133                 udelay(1);
1134 
1135         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1136                 dev_err(mmc_dev(host->mmc),
1137                         "Timeout waiting on controller reset in %s\n",
1138                         __func__);
1139 }
1140 
1141 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1142                                         int err, int end_cmd)
1143 {
1144         if (end_cmd) {
1145                 omap_hsmmc_reset_controller_fsm(host, SRC);
1146                 if (host->cmd)
1147                         host->cmd->error = err;
1148         }
1149 
1150         if (host->data) {
1151                 omap_hsmmc_reset_controller_fsm(host, SRD);
1152                 omap_hsmmc_dma_cleanup(host, err);
1153         } else if (host->mrq && host->mrq->cmd)
1154                 host->mrq->cmd->error = err;
1155 }
1156 
1157 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1158 {
1159         struct mmc_data *data;
1160         int end_cmd = 0, end_trans = 0;
1161         int error = 0;
1162 
1163         data = host->data;
1164         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1165 
1166         if (status & ERR_EN) {
1167                 omap_hsmmc_dbg_report_irq(host, status);
1168 
1169                 if (status & (CTO_EN | CCRC_EN))
1170                         end_cmd = 1;
1171                 if (host->data || host->response_busy) {
1172                         end_trans = !end_cmd;
1173                         host->response_busy = 0;
1174                 }
1175                 if (status & (CTO_EN | DTO_EN))
1176                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1177                 else if (status & (CCRC_EN | DCRC_EN | DEB_EN | CEB_EN |
1178                                    BADA_EN))
1179                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1180 
1181                 if (status & ACE_EN) {
1182                         u32 ac12;
1183                         ac12 = OMAP_HSMMC_READ(host->base, AC12);
1184                         if (!(ac12 & ACNE) && host->mrq->sbc) {
1185                                 end_cmd = 1;
1186                                 if (ac12 & ACTO)
1187                                         error =  -ETIMEDOUT;
1188                                 else if (ac12 & (ACCE | ACEB | ACIE))
1189                                         error = -EILSEQ;
1190                                 host->mrq->sbc->error = error;
1191                                 hsmmc_command_incomplete(host, error, end_cmd);
1192                         }
1193                         dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
1194                 }
1195         }
1196 
1197         OMAP_HSMMC_WRITE(host->base, STAT, status);
1198         if (end_cmd || ((status & CC_EN) && host->cmd))
1199                 omap_hsmmc_cmd_done(host, host->cmd);
1200         if ((end_trans || (status & TC_EN)) && host->mrq)
1201                 omap_hsmmc_xfer_done(host, data);
1202 }
1203 
1204 /*
1205  * MMC controller IRQ handler
1206  */
1207 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1208 {
1209         struct omap_hsmmc_host *host = dev_id;
1210         int status;
1211 
1212         status = OMAP_HSMMC_READ(host->base, STAT);
1213         while (status & (INT_EN_MASK | CIRQ_EN)) {
1214                 if (host->req_in_progress)
1215                         omap_hsmmc_do_irq(host, status);
1216 
1217                 if (status & CIRQ_EN)
1218                         mmc_signal_sdio_irq(host->mmc);
1219 
1220                 /* Flush posted write */
1221                 status = OMAP_HSMMC_READ(host->base, STAT);
1222         }
1223 
1224         return IRQ_HANDLED;
1225 }
1226 
1227 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1228 {
1229         unsigned long i;
1230 
1231         OMAP_HSMMC_WRITE(host->base, HCTL,
1232                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1233         for (i = 0; i < loops_per_jiffy; i++) {
1234                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1235                         break;
1236                 cpu_relax();
1237         }
1238 }
1239 
1240 /*
1241  * Switch MMC interface voltage ... only relevant for MMC1.
1242  *
1243  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1244  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1245  * Some chips, like eMMC ones, use internal transceivers.
1246  */
1247 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1248 {
1249         u32 reg_val = 0;
1250         int ret;
1251 
1252         /* Disable the clocks */
1253         pm_runtime_put_sync(host->dev);
1254         if (host->dbclk)
1255                 clk_disable_unprepare(host->dbclk);
1256 
1257         /* Turn the power off */
1258         ret = omap_hsmmc_set_power(host->dev, 0, 0);
1259 
1260         /* Turn the power ON with given VDD 1.8 or 3.0v */
1261         if (!ret)
1262                 ret = omap_hsmmc_set_power(host->dev, 1, vdd);
1263         pm_runtime_get_sync(host->dev);
1264         if (host->dbclk)
1265                 clk_prepare_enable(host->dbclk);
1266 
1267         if (ret != 0)
1268                 goto err;
1269 
1270         OMAP_HSMMC_WRITE(host->base, HCTL,
1271                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1272         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1273 
1274         /*
1275          * If a MMC dual voltage card is detected, the set_ios fn calls
1276          * this fn with VDD bit set for 1.8V. Upon card removal from the
1277          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1278          *
1279          * Cope with a bit of slop in the range ... per data sheets:
1280          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1281          *    but recommended values are 1.71V to 1.89V
1282          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1283          *    but recommended values are 2.7V to 3.3V
1284          *
1285          * Board setup code shouldn't permit anything very out-of-range.
1286          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1287          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1288          */
1289         if ((1 << vdd) <= MMC_VDD_23_24)
1290                 reg_val |= SDVS18;
1291         else
1292                 reg_val |= SDVS30;
1293 
1294         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1295         set_sd_bus_power(host);
1296 
1297         return 0;
1298 err:
1299         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1300         return ret;
1301 }
1302 
1303 /* Protect the card while the cover is open */
1304 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1305 {
1306         if (!host->get_cover_state)
1307                 return;
1308 
1309         host->reqs_blocked = 0;
1310         if (host->get_cover_state(host->dev)) {
1311                 if (host->protect_card) {
1312                         dev_info(host->dev, "%s: cover is closed, "
1313                                          "card is now accessible\n",
1314                                          mmc_hostname(host->mmc));
1315                         host->protect_card = 0;
1316                 }
1317         } else {
1318                 if (!host->protect_card) {
1319                         dev_info(host->dev, "%s: cover is open, "
1320                                          "card is now inaccessible\n",
1321                                          mmc_hostname(host->mmc));
1322                         host->protect_card = 1;
1323                 }
1324         }
1325 }
1326 
1327 /*
1328  * irq handler when (cell-phone) cover is mounted/removed
1329  */
1330 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id)
1331 {
1332         struct omap_hsmmc_host *host = dev_id;
1333 
1334         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1335 
1336         omap_hsmmc_protect_card(host);
1337         mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1338         return IRQ_HANDLED;
1339 }
1340 
1341 static void omap_hsmmc_dma_callback(void *param)
1342 {
1343         struct omap_hsmmc_host *host = param;
1344         struct dma_chan *chan;
1345         struct mmc_data *data;
1346         int req_in_progress;
1347 
1348         spin_lock_irq(&host->irq_lock);
1349         if (host->dma_ch < 0) {
1350                 spin_unlock_irq(&host->irq_lock);
1351                 return;
1352         }
1353 
1354         data = host->mrq->data;
1355         chan = omap_hsmmc_get_dma_chan(host, data);
1356         if (!data->host_cookie)
1357                 dma_unmap_sg(chan->device->dev,
1358                              data->sg, data->sg_len,
1359                              omap_hsmmc_get_dma_dir(host, data));
1360 
1361         req_in_progress = host->req_in_progress;
1362         host->dma_ch = -1;
1363         spin_unlock_irq(&host->irq_lock);
1364 
1365         /* If DMA has finished after TC, complete the request */
1366         if (!req_in_progress) {
1367                 struct mmc_request *mrq = host->mrq;
1368 
1369                 host->mrq = NULL;
1370                 mmc_request_done(host->mmc, mrq);
1371                 pm_runtime_mark_last_busy(host->dev);
1372                 pm_runtime_put_autosuspend(host->dev);
1373         }
1374 }
1375 
1376 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1377                                        struct mmc_data *data,
1378                                        struct omap_hsmmc_next *next,
1379                                        struct dma_chan *chan)
1380 {
1381         int dma_len;
1382 
1383         if (!next && data->host_cookie &&
1384             data->host_cookie != host->next_data.cookie) {
1385                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1386                        " host->next_data.cookie %d\n",
1387                        __func__, data->host_cookie, host->next_data.cookie);
1388                 data->host_cookie = 0;
1389         }
1390 
1391         /* Check if next job is already prepared */
1392         if (next || data->host_cookie != host->next_data.cookie) {
1393                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1394                                      omap_hsmmc_get_dma_dir(host, data));
1395 
1396         } else {
1397                 dma_len = host->next_data.dma_len;
1398                 host->next_data.dma_len = 0;
1399         }
1400 
1401 
1402         if (dma_len == 0)
1403                 return -EINVAL;
1404 
1405         if (next) {
1406                 next->dma_len = dma_len;
1407                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1408         } else
1409                 host->dma_len = dma_len;
1410 
1411         return 0;
1412 }
1413 
1414 /*
1415  * Routine to configure and start DMA for the MMC card
1416  */
1417 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
1418                                         struct mmc_request *req)
1419 {
1420         struct dma_slave_config cfg;
1421         struct dma_async_tx_descriptor *tx;
1422         int ret = 0, i;
1423         struct mmc_data *data = req->data;
1424         struct dma_chan *chan;
1425 
1426         /* Sanity check: all the SG entries must be aligned by block size. */
1427         for (i = 0; i < data->sg_len; i++) {
1428                 struct scatterlist *sgl;
1429 
1430                 sgl = data->sg + i;
1431                 if (sgl->length % data->blksz)
1432                         return -EINVAL;
1433         }
1434         if ((data->blksz % 4) != 0)
1435                 /* REVISIT: The MMC buffer increments only when MSB is written.
1436                  * Return error for blksz which is non multiple of four.
1437                  */
1438                 return -EINVAL;
1439 
1440         BUG_ON(host->dma_ch != -1);
1441 
1442         chan = omap_hsmmc_get_dma_chan(host, data);
1443 
1444         cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
1445         cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
1446         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1447         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1448         cfg.src_maxburst = data->blksz / 4;
1449         cfg.dst_maxburst = data->blksz / 4;
1450 
1451         ret = dmaengine_slave_config(chan, &cfg);
1452         if (ret)
1453                 return ret;
1454 
1455         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1456         if (ret)
1457                 return ret;
1458 
1459         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1460                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1461                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1462         if (!tx) {
1463                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1464                 /* FIXME: cleanup */
1465                 return -1;
1466         }
1467 
1468         tx->callback = omap_hsmmc_dma_callback;
1469         tx->callback_param = host;
1470 
1471         /* Does not fail */
1472         dmaengine_submit(tx);
1473 
1474         host->dma_ch = 1;
1475 
1476         return 0;
1477 }
1478 
1479 static void set_data_timeout(struct omap_hsmmc_host *host,
1480                              unsigned int timeout_ns,
1481                              unsigned int timeout_clks)
1482 {
1483         unsigned int timeout, cycle_ns;
1484         uint32_t reg, clkd, dto = 0;
1485 
1486         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1487         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1488         if (clkd == 0)
1489                 clkd = 1;
1490 
1491         cycle_ns = 1000000000 / (host->clk_rate / clkd);
1492         timeout = timeout_ns / cycle_ns;
1493         timeout += timeout_clks;
1494         if (timeout) {
1495                 while ((timeout & 0x80000000) == 0) {
1496                         dto += 1;
1497                         timeout <<= 1;
1498                 }
1499                 dto = 31 - dto;
1500                 timeout <<= 1;
1501                 if (timeout && dto)
1502                         dto += 1;
1503                 if (dto >= 13)
1504                         dto -= 13;
1505                 else
1506                         dto = 0;
1507                 if (dto > 14)
1508                         dto = 14;
1509         }
1510 
1511         reg &= ~DTO_MASK;
1512         reg |= dto << DTO_SHIFT;
1513         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1514 }
1515 
1516 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
1517 {
1518         struct mmc_request *req = host->mrq;
1519         struct dma_chan *chan;
1520 
1521         if (!req->data)
1522                 return;
1523         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1524                                 | (req->data->blocks << 16));
1525         set_data_timeout(host, req->data->timeout_ns,
1526                                 req->data->timeout_clks);
1527         chan = omap_hsmmc_get_dma_chan(host, req->data);
1528         dma_async_issue_pending(chan);
1529 }
1530 
1531 /*
1532  * Configure block length for MMC/SD cards and initiate the transfer.
1533  */
1534 static int
1535 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1536 {
1537         int ret;
1538         host->data = req->data;
1539 
1540         if (req->data == NULL) {
1541                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1542                 /*
1543                  * Set an arbitrary 100ms data timeout for commands with
1544                  * busy signal.
1545                  */
1546                 if (req->cmd->flags & MMC_RSP_BUSY)
1547                         set_data_timeout(host, 100000000U, 0);
1548                 return 0;
1549         }
1550 
1551         if (host->use_dma) {
1552                 ret = omap_hsmmc_setup_dma_transfer(host, req);
1553                 if (ret != 0) {
1554                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1555                         return ret;
1556                 }
1557         }
1558         return 0;
1559 }
1560 
1561 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1562                                 int err)
1563 {
1564         struct omap_hsmmc_host *host = mmc_priv(mmc);
1565         struct mmc_data *data = mrq->data;
1566 
1567         if (host->use_dma && data->host_cookie) {
1568                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1569 
1570                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1571                              omap_hsmmc_get_dma_dir(host, data));
1572                 data->host_cookie = 0;
1573         }
1574 }
1575 
1576 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1577                                bool is_first_req)
1578 {
1579         struct omap_hsmmc_host *host = mmc_priv(mmc);
1580 
1581         if (mrq->data->host_cookie) {
1582                 mrq->data->host_cookie = 0;
1583                 return ;
1584         }
1585 
1586         if (host->use_dma) {
1587                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1588 
1589                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1590                                                 &host->next_data, c))
1591                         mrq->data->host_cookie = 0;
1592         }
1593 }
1594 
1595 /*
1596  * Request function. for read/write operation
1597  */
1598 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1599 {
1600         struct omap_hsmmc_host *host = mmc_priv(mmc);
1601         int err;
1602 
1603         BUG_ON(host->req_in_progress);
1604         BUG_ON(host->dma_ch != -1);
1605         pm_runtime_get_sync(host->dev);
1606         if (host->protect_card) {
1607                 if (host->reqs_blocked < 3) {
1608                         /*
1609                          * Ensure the controller is left in a consistent
1610                          * state by resetting the command and data state
1611                          * machines.
1612                          */
1613                         omap_hsmmc_reset_controller_fsm(host, SRD);
1614                         omap_hsmmc_reset_controller_fsm(host, SRC);
1615                         host->reqs_blocked += 1;
1616                 }
1617                 req->cmd->error = -EBADF;
1618                 if (req->data)
1619                         req->data->error = -EBADF;
1620                 req->cmd->retries = 0;
1621                 mmc_request_done(mmc, req);
1622                 pm_runtime_mark_last_busy(host->dev);
1623                 pm_runtime_put_autosuspend(host->dev);
1624                 return;
1625         } else if (host->reqs_blocked)
1626                 host->reqs_blocked = 0;
1627         WARN_ON(host->mrq != NULL);
1628         host->mrq = req;
1629         host->clk_rate = clk_get_rate(host->fclk);
1630         err = omap_hsmmc_prepare_data(host, req);
1631         if (err) {
1632                 req->cmd->error = err;
1633                 if (req->data)
1634                         req->data->error = err;
1635                 host->mrq = NULL;
1636                 mmc_request_done(mmc, req);
1637                 pm_runtime_mark_last_busy(host->dev);
1638                 pm_runtime_put_autosuspend(host->dev);
1639                 return;
1640         }
1641         if (req->sbc && !(host->flags & AUTO_CMD23)) {
1642                 omap_hsmmc_start_command(host, req->sbc, NULL);
1643                 return;
1644         }
1645 
1646         omap_hsmmc_start_dma_transfer(host);
1647         omap_hsmmc_start_command(host, req->cmd, req->data);
1648 }
1649 
1650 /* Routine to configure clock values. Exposed API to core */
1651 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1652 {
1653         struct omap_hsmmc_host *host = mmc_priv(mmc);
1654         int do_send_init_stream = 0;
1655 
1656         pm_runtime_get_sync(host->dev);
1657 
1658         if (ios->power_mode != host->power_mode) {
1659                 switch (ios->power_mode) {
1660                 case MMC_POWER_OFF:
1661                         omap_hsmmc_set_power(host->dev, 0, 0);
1662                         break;
1663                 case MMC_POWER_UP:
1664                         omap_hsmmc_set_power(host->dev, 1, ios->vdd);
1665                         break;
1666                 case MMC_POWER_ON:
1667                         do_send_init_stream = 1;
1668                         break;
1669                 }
1670                 host->power_mode = ios->power_mode;
1671         }
1672 
1673         /* FIXME: set registers based only on changes to ios */
1674 
1675         omap_hsmmc_set_bus_width(host);
1676 
1677         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1678                 /* Only MMC1 can interface at 3V without some flavor
1679                  * of external transceiver; but they all handle 1.8V.
1680                  */
1681                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1682                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1683                                 /*
1684                                  * The mmc_select_voltage fn of the core does
1685                                  * not seem to set the power_mode to
1686                                  * MMC_POWER_UP upon recalculating the voltage.
1687                                  * vdd 1.8v.
1688                                  */
1689                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1690                                 dev_dbg(mmc_dev(host->mmc),
1691                                                 "Switch operation failed\n");
1692                 }
1693         }
1694 
1695         omap_hsmmc_set_clock(host);
1696 
1697         if (do_send_init_stream)
1698                 send_init_stream(host);
1699 
1700         omap_hsmmc_set_bus_mode(host);
1701 
1702         pm_runtime_put_autosuspend(host->dev);
1703 }
1704 
1705 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1706 {
1707         struct omap_hsmmc_host *host = mmc_priv(mmc);
1708 
1709         if (!host->card_detect)
1710                 return -ENOSYS;
1711         return host->card_detect(host->dev);
1712 }
1713 
1714 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1715 {
1716         struct omap_hsmmc_host *host = mmc_priv(mmc);
1717 
1718         if (mmc_pdata(host)->init_card)
1719                 mmc_pdata(host)->init_card(card);
1720 }
1721 
1722 static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1723 {
1724         struct omap_hsmmc_host *host = mmc_priv(mmc);
1725         u32 irq_mask, con;
1726         unsigned long flags;
1727 
1728         spin_lock_irqsave(&host->irq_lock, flags);
1729 
1730         con = OMAP_HSMMC_READ(host->base, CON);
1731         irq_mask = OMAP_HSMMC_READ(host->base, ISE);
1732         if (enable) {
1733                 host->flags |= HSMMC_SDIO_IRQ_ENABLED;
1734                 irq_mask |= CIRQ_EN;
1735                 con |= CTPL | CLKEXTFREE;
1736         } else {
1737                 host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
1738                 irq_mask &= ~CIRQ_EN;
1739                 con &= ~(CTPL | CLKEXTFREE);
1740         }
1741         OMAP_HSMMC_WRITE(host->base, CON, con);
1742         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
1743 
1744         /*
1745          * if enable, piggy back detection on current request
1746          * but always disable immediately
1747          */
1748         if (!host->req_in_progress || !enable)
1749                 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
1750 
1751         /* flush posted write */
1752         OMAP_HSMMC_READ(host->base, IE);
1753 
1754         spin_unlock_irqrestore(&host->irq_lock, flags);
1755 }
1756 
1757 static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
1758 {
1759         int ret;
1760 
1761         /*
1762          * For omaps with wake-up path, wakeirq will be irq from pinctrl and
1763          * for other omaps, wakeirq will be from GPIO (dat line remuxed to
1764          * gpio). wakeirq is needed to detect sdio irq in runtime suspend state
1765          * with functional clock disabled.
1766          */
1767         if (!host->dev->of_node || !host->wake_irq)
1768                 return -ENODEV;
1769 
1770         ret = dev_pm_set_dedicated_wake_irq(host->dev, host->wake_irq);
1771         if (ret) {
1772                 dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n");
1773                 goto err;
1774         }
1775 
1776         /*
1777          * Some omaps don't have wake-up path from deeper idle states
1778          * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
1779          */
1780         if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
1781                 struct pinctrl *p = devm_pinctrl_get(host->dev);
1782                 if (!p) {
1783                         ret = -ENODEV;
1784                         goto err_free_irq;
1785                 }
1786                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {
1787                         dev_info(host->dev, "missing default pinctrl state\n");
1788                         devm_pinctrl_put(p);
1789                         ret = -EINVAL;
1790                         goto err_free_irq;
1791                 }
1792 
1793                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) {
1794                         dev_info(host->dev, "missing idle pinctrl state\n");
1795                         devm_pinctrl_put(p);
1796                         ret = -EINVAL;
1797                         goto err_free_irq;
1798                 }
1799                 devm_pinctrl_put(p);
1800         }
1801 
1802         OMAP_HSMMC_WRITE(host->base, HCTL,
1803                          OMAP_HSMMC_READ(host->base, HCTL) | IWE);
1804         return 0;
1805 
1806 err_free_irq:
1807         dev_pm_clear_wake_irq(host->dev);
1808 err:
1809         dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n");
1810         host->wake_irq = 0;
1811         return ret;
1812 }
1813 
1814 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1815 {
1816         u32 hctl, capa, value;
1817 
1818         /* Only MMC1 supports 3.0V */
1819         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1820                 hctl = SDVS30;
1821                 capa = VS30 | VS18;
1822         } else {
1823                 hctl = SDVS18;
1824                 capa = VS18;
1825         }
1826 
1827         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1828         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1829 
1830         value = OMAP_HSMMC_READ(host->base, CAPA);
1831         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1832 
1833         /* Set SD bus power bit */
1834         set_sd_bus_power(host);
1835 }
1836 
1837 static int omap_hsmmc_multi_io_quirk(struct mmc_card *card,
1838                                      unsigned int direction, int blk_size)
1839 {
1840         /* This controller can't do multiblock reads due to hw bugs */
1841         if (direction == MMC_DATA_READ)
1842                 return 1;
1843 
1844         return blk_size;
1845 }
1846 
1847 static struct mmc_host_ops omap_hsmmc_ops = {
1848         .post_req = omap_hsmmc_post_req,
1849         .pre_req = omap_hsmmc_pre_req,
1850         .request = omap_hsmmc_request,
1851         .set_ios = omap_hsmmc_set_ios,
1852         .get_cd = omap_hsmmc_get_cd,
1853         .get_ro = mmc_gpio_get_ro,
1854         .init_card = omap_hsmmc_init_card,
1855         .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
1856 };
1857 
1858 #ifdef CONFIG_DEBUG_FS
1859 
1860 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1861 {
1862         struct mmc_host *mmc = s->private;
1863         struct omap_hsmmc_host *host = mmc_priv(mmc);
1864 
1865         seq_printf(s, "mmc%d:\n", mmc->index);
1866         seq_printf(s, "sdio irq mode\t%s\n",
1867                    (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling");
1868 
1869         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1870                 seq_printf(s, "sdio irq \t%s\n",
1871                            (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?  "enabled"
1872                            : "disabled");
1873         }
1874         seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
1875 
1876         pm_runtime_get_sync(host->dev);
1877         seq_puts(s, "\nregs:\n");
1878         seq_printf(s, "CON:\t\t0x%08x\n",
1879                         OMAP_HSMMC_READ(host->base, CON));
1880         seq_printf(s, "PSTATE:\t\t0x%08x\n",
1881                    OMAP_HSMMC_READ(host->base, PSTATE));
1882         seq_printf(s, "HCTL:\t\t0x%08x\n",
1883                         OMAP_HSMMC_READ(host->base, HCTL));
1884         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1885                         OMAP_HSMMC_READ(host->base, SYSCTL));
1886         seq_printf(s, "IE:\t\t0x%08x\n",
1887                         OMAP_HSMMC_READ(host->base, IE));
1888         seq_printf(s, "ISE:\t\t0x%08x\n",
1889                         OMAP_HSMMC_READ(host->base, ISE));
1890         seq_printf(s, "CAPA:\t\t0x%08x\n",
1891                         OMAP_HSMMC_READ(host->base, CAPA));
1892 
1893         pm_runtime_mark_last_busy(host->dev);
1894         pm_runtime_put_autosuspend(host->dev);
1895 
1896         return 0;
1897 }
1898 
1899 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1900 {
1901         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1902 }
1903 
1904 static const struct file_operations mmc_regs_fops = {
1905         .open           = omap_hsmmc_regs_open,
1906         .read           = seq_read,
1907         .llseek         = seq_lseek,
1908         .release        = single_release,
1909 };
1910 
1911 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1912 {
1913         if (mmc->debugfs_root)
1914                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1915                         mmc, &mmc_regs_fops);
1916 }
1917 
1918 #else
1919 
1920 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1921 {
1922 }
1923 
1924 #endif
1925 
1926 #ifdef CONFIG_OF
1927 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
1928         /* See 35xx errata 2.1.1.128 in SPRZ278F */
1929         .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
1930 };
1931 
1932 static const struct omap_mmc_of_data omap4_mmc_of_data = {
1933         .reg_offset = 0x100,
1934 };
1935 static const struct omap_mmc_of_data am33xx_mmc_of_data = {
1936         .reg_offset = 0x100,
1937         .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING,
1938 };
1939 
1940 static const struct of_device_id omap_mmc_of_match[] = {
1941         {
1942                 .compatible = "ti,omap2-hsmmc",
1943         },
1944         {
1945                 .compatible = "ti,omap3-pre-es3-hsmmc",
1946                 .data = &omap3_pre_es3_mmc_of_data,
1947         },
1948         {
1949                 .compatible = "ti,omap3-hsmmc",
1950         },
1951         {
1952                 .compatible = "ti,omap4-hsmmc",
1953                 .data = &omap4_mmc_of_data,
1954         },
1955         {
1956                 .compatible = "ti,am33xx-hsmmc",
1957                 .data = &am33xx_mmc_of_data,
1958         },
1959         {},
1960 };
1961 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1962 
1963 static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1964 {
1965         struct omap_hsmmc_platform_data *pdata;
1966         struct device_node *np = dev->of_node;
1967 
1968         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1969         if (!pdata)
1970                 return ERR_PTR(-ENOMEM); /* out of memory */
1971 
1972         if (of_find_property(np, "ti,dual-volt", NULL))
1973                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1974 
1975         pdata->gpio_cd = -EINVAL;
1976         pdata->gpio_cod = -EINVAL;
1977         pdata->gpio_wp = -EINVAL;
1978 
1979         if (of_find_property(np, "ti,non-removable", NULL)) {
1980                 pdata->nonremovable = true;
1981                 pdata->no_regulator_off_init = true;
1982         }
1983 
1984         if (of_find_property(np, "ti,needs-special-reset", NULL))
1985                 pdata->features |= HSMMC_HAS_UPDATED_RESET;
1986 
1987         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
1988                 pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
1989 
1990         return pdata;
1991 }
1992 #else
1993 static inline struct omap_hsmmc_platform_data
1994                         *of_get_hsmmc_pdata(struct device *dev)
1995 {
1996         return ERR_PTR(-EINVAL);
1997 }
1998 #endif
1999 
2000 static int omap_hsmmc_probe(struct platform_device *pdev)
2001 {
2002         struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
2003         struct mmc_host *mmc;
2004         struct omap_hsmmc_host *host = NULL;
2005         struct resource *res;
2006         int ret, irq;
2007         const struct of_device_id *match;
2008         dma_cap_mask_t mask;
2009         unsigned tx_req, rx_req;
2010         const struct omap_mmc_of_data *data;
2011         void __iomem *base;
2012 
2013         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
2014         if (match) {
2015                 pdata = of_get_hsmmc_pdata(&pdev->dev);
2016 
2017                 if (IS_ERR(pdata))
2018                         return PTR_ERR(pdata);
2019 
2020                 if (match->data) {
2021                         data = match->data;
2022                         pdata->reg_offset = data->reg_offset;
2023                         pdata->controller_flags |= data->controller_flags;
2024                 }
2025         }
2026 
2027         if (pdata == NULL) {
2028                 dev_err(&pdev->dev, "Platform Data is missing\n");
2029                 return -ENXIO;
2030         }
2031 
2032         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2033         irq = platform_get_irq(pdev, 0);
2034         if (res == NULL || irq < 0)
2035                 return -ENXIO;
2036 
2037         base = devm_ioremap_resource(&pdev->dev, res);
2038         if (IS_ERR(base))
2039                 return PTR_ERR(base);
2040 
2041         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
2042         if (!mmc) {
2043                 ret = -ENOMEM;
2044                 goto err;
2045         }
2046 
2047         ret = mmc_of_parse(mmc);
2048         if (ret)
2049                 goto err1;
2050 
2051         host            = mmc_priv(mmc);
2052         host->mmc       = mmc;
2053         host->pdata     = pdata;
2054         host->dev       = &pdev->dev;
2055         host->use_dma   = 1;
2056         host->dma_ch    = -1;
2057         host->irq       = irq;
2058         host->mapbase   = res->start + pdata->reg_offset;
2059         host->base      = base + pdata->reg_offset;
2060         host->power_mode = MMC_POWER_OFF;
2061         host->next_data.cookie = 1;
2062         host->pbias_enabled = 0;
2063         host->vqmmc_enabled = 0;
2064 
2065         ret = omap_hsmmc_gpio_init(mmc, host, pdata);
2066         if (ret)
2067                 goto err_gpio;
2068 
2069         platform_set_drvdata(pdev, host);
2070 
2071         if (pdev->dev.of_node)
2072                 host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
2073 
2074         mmc->ops        = &omap_hsmmc_ops;
2075 
2076         mmc->f_min = OMAP_MMC_MIN_CLOCK;
2077 
2078         if (pdata->max_freq > 0)
2079                 mmc->f_max = pdata->max_freq;
2080         else if (mmc->f_max == 0)
2081                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
2082 
2083         spin_lock_init(&host->irq_lock);
2084 
2085         host->fclk = devm_clk_get(&pdev->dev, "fck");
2086         if (IS_ERR(host->fclk)) {
2087                 ret = PTR_ERR(host->fclk);
2088                 host->fclk = NULL;
2089                 goto err1;
2090         }
2091 
2092         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
2093                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
2094                 omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
2095         }
2096 
2097         device_init_wakeup(&pdev->dev, true);
2098         pm_runtime_enable(host->dev);
2099         pm_runtime_get_sync(host->dev);
2100         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
2101         pm_runtime_use_autosuspend(host->dev);
2102 
2103         omap_hsmmc_context_save(host);
2104 
2105         host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck");
2106         /*
2107          * MMC can still work without debounce clock.
2108          */
2109         if (IS_ERR(host->dbclk)) {
2110                 host->dbclk = NULL;
2111         } else if (clk_prepare_enable(host->dbclk) != 0) {
2112                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
2113                 host->dbclk = NULL;
2114         }
2115 
2116         /* Since we do only SG emulation, we can have as many segs
2117          * as we want. */
2118         mmc->max_segs = 1024;
2119 
2120         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
2121         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
2122         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2123         mmc->max_seg_size = mmc->max_req_size;
2124 
2125         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2126                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2127 
2128         mmc->caps |= mmc_pdata(host)->caps;
2129         if (mmc->caps & MMC_CAP_8_BIT_DATA)
2130                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2131 
2132         if (mmc_pdata(host)->nonremovable)
2133                 mmc->caps |= MMC_CAP_NONREMOVABLE;
2134 
2135         mmc->pm_caps |= mmc_pdata(host)->pm_caps;
2136 
2137         omap_hsmmc_conf_bus_power(host);
2138 
2139         if (!pdev->dev.of_node) {
2140                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
2141                 if (!res) {
2142                         dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
2143                         ret = -ENXIO;
2144                         goto err_irq;
2145                 }
2146                 tx_req = res->start;
2147 
2148                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
2149                 if (!res) {
2150                         dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
2151                         ret = -ENXIO;
2152                         goto err_irq;
2153                 }
2154                 rx_req = res->start;
2155         }
2156 
2157         dma_cap_zero(mask);
2158         dma_cap_set(DMA_SLAVE, mask);
2159 
2160         host->rx_chan =
2161                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2162                                                  &rx_req, &pdev->dev, "rx");
2163 
2164         if (!host->rx_chan) {
2165                 dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
2166                 ret = -ENXIO;
2167                 goto err_irq;
2168         }
2169 
2170         host->tx_chan =
2171                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2172                                                  &tx_req, &pdev->dev, "tx");
2173 
2174         if (!host->tx_chan) {
2175                 dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
2176                 ret = -ENXIO;
2177                 goto err_irq;
2178         }
2179 
2180         /* Request IRQ for MMC operations */
2181         ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
2182                         mmc_hostname(mmc), host);
2183         if (ret) {
2184                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2185                 goto err_irq;
2186         }
2187 
2188         ret = omap_hsmmc_reg_get(host);
2189         if (ret)
2190                 goto err_irq;
2191 
2192         mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
2193 
2194         omap_hsmmc_disable_irq(host);
2195 
2196         /*
2197          * For now, only support SDIO interrupt if we have a separate
2198          * wake-up interrupt configured from device tree. This is because
2199          * the wake-up interrupt is needed for idle state and some
2200          * platforms need special quirks. And we don't want to add new
2201          * legacy mux platform init code callbacks any longer as we
2202          * are moving to DT based booting anyways.
2203          */
2204         ret = omap_hsmmc_configure_wake_irq(host);
2205         if (!ret)
2206                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2207 
2208         omap_hsmmc_protect_card(host);
2209 
2210         mmc_add_host(mmc);
2211 
2212         if (mmc_pdata(host)->name != NULL) {
2213                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2214                 if (ret < 0)
2215                         goto err_slot_name;
2216         }
2217         if (host->get_cover_state) {
2218                 ret = device_create_file(&mmc->class_dev,
2219                                          &dev_attr_cover_switch);
2220                 if (ret < 0)
2221                         goto err_slot_name;
2222         }
2223 
2224         omap_hsmmc_debugfs(mmc);
2225         pm_runtime_mark_last_busy(host->dev);
2226         pm_runtime_put_autosuspend(host->dev);
2227 
2228         return 0;
2229 
2230 err_slot_name:
2231         mmc_remove_host(mmc);
2232 err_irq:
2233         device_init_wakeup(&pdev->dev, false);
2234         if (host->tx_chan)
2235                 dma_release_channel(host->tx_chan);
2236         if (host->rx_chan)
2237                 dma_release_channel(host->rx_chan);
2238         pm_runtime_dont_use_autosuspend(host->dev);
2239         pm_runtime_put_sync(host->dev);
2240         pm_runtime_disable(host->dev);
2241         if (host->dbclk)
2242                 clk_disable_unprepare(host->dbclk);
2243 err1:
2244 err_gpio:
2245         mmc_free_host(mmc);
2246 err:
2247         return ret;
2248 }
2249 
2250 static int omap_hsmmc_remove(struct platform_device *pdev)
2251 {
2252         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2253 
2254         pm_runtime_get_sync(host->dev);
2255         mmc_remove_host(host->mmc);
2256 
2257         dma_release_channel(host->tx_chan);
2258         dma_release_channel(host->rx_chan);
2259 
2260         pm_runtime_dont_use_autosuspend(host->dev);
2261         pm_runtime_put_sync(host->dev);
2262         pm_runtime_disable(host->dev);
2263         device_init_wakeup(&pdev->dev, false);
2264         if (host->dbclk)
2265                 clk_disable_unprepare(host->dbclk);
2266 
2267         mmc_free_host(host->mmc);
2268 
2269         return 0;
2270 }
2271 
2272 #ifdef CONFIG_PM_SLEEP
2273 static int omap_hsmmc_suspend(struct device *dev)
2274 {
2275         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2276 
2277         if (!host)
2278                 return 0;
2279 
2280         pm_runtime_get_sync(host->dev);
2281 
2282         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2283                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2284                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2285                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2286                 OMAP_HSMMC_WRITE(host->base, HCTL,
2287                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2288         }
2289 
2290         if (host->dbclk)
2291                 clk_disable_unprepare(host->dbclk);
2292 
2293         pm_runtime_put_sync(host->dev);
2294         return 0;
2295 }
2296 
2297 /* Routine to resume the MMC device */
2298 static int omap_hsmmc_resume(struct device *dev)
2299 {
2300         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2301 
2302         if (!host)
2303                 return 0;
2304 
2305         pm_runtime_get_sync(host->dev);
2306 
2307         if (host->dbclk)
2308                 clk_prepare_enable(host->dbclk);
2309 
2310         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2311                 omap_hsmmc_conf_bus_power(host);
2312 
2313         omap_hsmmc_protect_card(host);
2314         pm_runtime_mark_last_busy(host->dev);
2315         pm_runtime_put_autosuspend(host->dev);
2316         return 0;
2317 }
2318 #endif
2319 
2320 static int omap_hsmmc_runtime_suspend(struct device *dev)
2321 {
2322         struct omap_hsmmc_host *host;
2323         unsigned long flags;
2324         int ret = 0;
2325 
2326         host = platform_get_drvdata(to_platform_device(dev));
2327         omap_hsmmc_context_save(host);
2328         dev_dbg(dev, "disabled\n");
2329 
2330         spin_lock_irqsave(&host->irq_lock, flags);
2331         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2332             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2333                 /* disable sdio irq handling to prevent race */
2334                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2335                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2336 
2337                 if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) {
2338                         /*
2339                          * dat1 line low, pending sdio irq
2340                          * race condition: possible irq handler running on
2341                          * multi-core, abort
2342                          */
2343                         dev_dbg(dev, "pending sdio irq, abort suspend\n");
2344                         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2345                         OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2346                         OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2347                         pm_runtime_mark_last_busy(dev);
2348                         ret = -EBUSY;
2349                         goto abort;
2350                 }
2351 
2352                 pinctrl_pm_select_idle_state(dev);
2353         } else {
2354                 pinctrl_pm_select_idle_state(dev);
2355         }
2356 
2357 abort:
2358         spin_unlock_irqrestore(&host->irq_lock, flags);
2359         return ret;
2360 }
2361 
2362 static int omap_hsmmc_runtime_resume(struct device *dev)
2363 {
2364         struct omap_hsmmc_host *host;
2365         unsigned long flags;
2366 
2367         host = platform_get_drvdata(to_platform_device(dev));
2368         omap_hsmmc_context_restore(host);
2369         dev_dbg(dev, "enabled\n");
2370 
2371         spin_lock_irqsave(&host->irq_lock, flags);
2372         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2373             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2374 
2375                 pinctrl_pm_select_default_state(host->dev);
2376 
2377                 /* irq lost, if pinmux incorrect */
2378                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2379                 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2380                 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2381         } else {
2382                 pinctrl_pm_select_default_state(host->dev);
2383         }
2384         spin_unlock_irqrestore(&host->irq_lock, flags);
2385         return 0;
2386 }
2387 
2388 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2389         SET_SYSTEM_SLEEP_PM_OPS(omap_hsmmc_suspend, omap_hsmmc_resume)
2390         .runtime_suspend = omap_hsmmc_runtime_suspend,
2391         .runtime_resume = omap_hsmmc_runtime_resume,
2392 };
2393 
2394 static struct platform_driver omap_hsmmc_driver = {
2395         .probe          = omap_hsmmc_probe,
2396         .remove         = omap_hsmmc_remove,
2397         .driver         = {
2398                 .name = DRIVER_NAME,
2399                 .pm = &omap_hsmmc_dev_pm_ops,
2400                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2401         },
2402 };
2403 
2404 module_platform_driver(omap_hsmmc_driver);
2405 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2406 MODULE_LICENSE("GPL");
2407 MODULE_ALIAS("platform:" DRIVER_NAME);
2408 MODULE_AUTHOR("Texas Instruments Inc");
2409 

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