Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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_gpio.h>
 33 #include <linux/of_device.h>
 34 #include <linux/omap-dma.h>
 35 #include <linux/mmc/host.h>
 36 #include <linux/mmc/core.h>
 37 #include <linux/mmc/mmc.h>
 38 #include <linux/io.h>
 39 #include <linux/gpio.h>
 40 #include <linux/regulator/consumer.h>
 41 #include <linux/pinctrl/consumer.h>
 42 #include <linux/pm_runtime.h>
 43 #include <linux/platform_data/mmc-omap.h>
 44 
 45 /* OMAP HSMMC Host Controller Registers */
 46 #define OMAP_HSMMC_SYSSTATUS    0x0014
 47 #define OMAP_HSMMC_CON          0x002C
 48 #define OMAP_HSMMC_SDMASA       0x0100
 49 #define OMAP_HSMMC_BLK          0x0104
 50 #define OMAP_HSMMC_ARG          0x0108
 51 #define OMAP_HSMMC_CMD          0x010C
 52 #define OMAP_HSMMC_RSP10        0x0110
 53 #define OMAP_HSMMC_RSP32        0x0114
 54 #define OMAP_HSMMC_RSP54        0x0118
 55 #define OMAP_HSMMC_RSP76        0x011C
 56 #define OMAP_HSMMC_DATA         0x0120
 57 #define OMAP_HSMMC_HCTL         0x0128
 58 #define OMAP_HSMMC_SYSCTL       0x012C
 59 #define OMAP_HSMMC_STAT         0x0130
 60 #define OMAP_HSMMC_IE           0x0134
 61 #define OMAP_HSMMC_ISE          0x0138
 62 #define OMAP_HSMMC_AC12         0x013C
 63 #define OMAP_HSMMC_CAPA         0x0140
 64 
 65 #define VS18                    (1 << 26)
 66 #define VS30                    (1 << 25)
 67 #define HSS                     (1 << 21)
 68 #define SDVS18                  (0x5 << 9)
 69 #define SDVS30                  (0x6 << 9)
 70 #define SDVS33                  (0x7 << 9)
 71 #define SDVS_MASK               0x00000E00
 72 #define SDVSCLR                 0xFFFFF1FF
 73 #define SDVSDET                 0x00000400
 74 #define AUTOIDLE                0x1
 75 #define SDBP                    (1 << 8)
 76 #define DTO                     0xe
 77 #define ICE                     0x1
 78 #define ICS                     0x2
 79 #define CEN                     (1 << 2)
 80 #define CLKD_MAX                0x3FF           /* max clock divisor: 1023 */
 81 #define CLKD_MASK               0x0000FFC0
 82 #define CLKD_SHIFT              6
 83 #define DTO_MASK                0x000F0000
 84 #define DTO_SHIFT               16
 85 #define INIT_STREAM             (1 << 1)
 86 #define ACEN_ACMD23             (2 << 2)
 87 #define DP_SELECT               (1 << 21)
 88 #define DDIR                    (1 << 4)
 89 #define DMAE                    0x1
 90 #define MSBS                    (1 << 5)
 91 #define BCE                     (1 << 1)
 92 #define FOUR_BIT                (1 << 1)
 93 #define HSPE                    (1 << 2)
 94 #define DDR                     (1 << 19)
 95 #define DW8                     (1 << 5)
 96 #define OD                      0x1
 97 #define STAT_CLEAR              0xFFFFFFFF
 98 #define INIT_STREAM_CMD         0x00000000
 99 #define DUAL_VOLT_OCR_BIT       7
100 #define SRC                     (1 << 25)
101 #define SRD                     (1 << 26)
102 #define SOFTRESET               (1 << 1)
103 
104 /* Interrupt masks for IE and ISE register */
105 #define CC_EN                   (1 << 0)
106 #define TC_EN                   (1 << 1)
107 #define BWR_EN                  (1 << 4)
108 #define BRR_EN                  (1 << 5)
109 #define ERR_EN                  (1 << 15)
110 #define CTO_EN                  (1 << 16)
111 #define CCRC_EN                 (1 << 17)
112 #define CEB_EN                  (1 << 18)
113 #define CIE_EN                  (1 << 19)
114 #define DTO_EN                  (1 << 20)
115 #define DCRC_EN                 (1 << 21)
116 #define DEB_EN                  (1 << 22)
117 #define ACE_EN                  (1 << 24)
118 #define CERR_EN                 (1 << 28)
119 #define BADA_EN                 (1 << 29)
120 
121 #define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
122                 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
123                 BRR_EN | BWR_EN | TC_EN | CC_EN)
124 
125 #define CNI     (1 << 7)
126 #define ACIE    (1 << 4)
127 #define ACEB    (1 << 3)
128 #define ACCE    (1 << 2)
129 #define ACTO    (1 << 1)
130 #define ACNE    (1 << 0)
131 
132 #define MMC_AUTOSUSPEND_DELAY   100
133 #define MMC_TIMEOUT_MS          20              /* 20 mSec */
134 #define MMC_TIMEOUT_US          20000           /* 20000 micro Sec */
135 #define OMAP_MMC_MIN_CLOCK      400000
136 #define OMAP_MMC_MAX_CLOCK      52000000
137 #define DRIVER_NAME             "omap_hsmmc"
138 
139 #define VDD_1V8                 1800000         /* 180000 uV */
140 #define VDD_3V0                 3000000         /* 300000 uV */
141 #define VDD_165_195             (ffs(MMC_VDD_165_195) - 1)
142 
143 #define AUTO_CMD23              (1 << 1)        /* Auto CMD23 support */
144 /*
145  * One controller can have multiple slots, like on some omap boards using
146  * omap.c controller driver. Luckily this is not currently done on any known
147  * omap_hsmmc.c device.
148  */
149 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
150 
151 /*
152  * MMC Host controller read/write API's
153  */
154 #define OMAP_HSMMC_READ(base, reg)      \
155         __raw_readl((base) + OMAP_HSMMC_##reg)
156 
157 #define OMAP_HSMMC_WRITE(base, reg, val) \
158         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
159 
160 struct omap_hsmmc_next {
161         unsigned int    dma_len;
162         s32             cookie;
163 };
164 
165 struct omap_hsmmc_host {
166         struct  device          *dev;
167         struct  mmc_host        *mmc;
168         struct  mmc_request     *mrq;
169         struct  mmc_command     *cmd;
170         struct  mmc_data        *data;
171         struct  clk             *fclk;
172         struct  clk             *dbclk;
173         /*
174          * vcc == configured supply
175          * vcc_aux == optional
176          *   -  MMC1, supply for DAT4..DAT7
177          *   -  MMC2/MMC2, external level shifter voltage supply, for
178          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
179          */
180         struct  regulator       *vcc;
181         struct  regulator       *vcc_aux;
182         struct  regulator       *pbias;
183         bool                    pbias_enabled;
184         void    __iomem         *base;
185         resource_size_t         mapbase;
186         spinlock_t              irq_lock; /* Prevent races with irq handler */
187         unsigned int            dma_len;
188         unsigned int            dma_sg_idx;
189         unsigned char           bus_mode;
190         unsigned char           power_mode;
191         int                     suspended;
192         u32                     con;
193         u32                     hctl;
194         u32                     sysctl;
195         u32                     capa;
196         int                     irq;
197         int                     use_dma, dma_ch;
198         struct dma_chan         *tx_chan;
199         struct dma_chan         *rx_chan;
200         int                     slot_id;
201         int                     response_busy;
202         int                     context_loss;
203         int                     protect_card;
204         int                     reqs_blocked;
205         int                     use_reg;
206         int                     req_in_progress;
207         unsigned long           clk_rate;
208         unsigned int            flags;
209         struct omap_hsmmc_next  next_data;
210         struct  omap_mmc_platform_data  *pdata;
211 };
212 
213 struct omap_mmc_of_data {
214         u32 reg_offset;
215         u8 controller_flags;
216 };
217 
218 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
219 
220 static int omap_hsmmc_card_detect(struct device *dev, int slot)
221 {
222         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
223         struct omap_mmc_platform_data *mmc = host->pdata;
224 
225         /* NOTE: assumes card detect signal is active-low */
226         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
227 }
228 
229 static int omap_hsmmc_get_wp(struct device *dev, int slot)
230 {
231         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
232         struct omap_mmc_platform_data *mmc = host->pdata;
233 
234         /* NOTE: assumes write protect signal is active-high */
235         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
236 }
237 
238 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
239 {
240         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
241         struct omap_mmc_platform_data *mmc = host->pdata;
242 
243         /* NOTE: assumes card detect signal is active-low */
244         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
245 }
246 
247 #ifdef CONFIG_PM
248 
249 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
250 {
251         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
252         struct omap_mmc_platform_data *mmc = host->pdata;
253 
254         disable_irq(mmc->slots[0].card_detect_irq);
255         return 0;
256 }
257 
258 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
259 {
260         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
261         struct omap_mmc_platform_data *mmc = host->pdata;
262 
263         enable_irq(mmc->slots[0].card_detect_irq);
264         return 0;
265 }
266 
267 #else
268 
269 #define omap_hsmmc_suspend_cdirq        NULL
270 #define omap_hsmmc_resume_cdirq         NULL
271 
272 #endif
273 
274 #ifdef CONFIG_REGULATOR
275 
276 static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on,
277                                    int vdd)
278 {
279         struct omap_hsmmc_host *host =
280                 platform_get_drvdata(to_platform_device(dev));
281         int ret = 0;
282 
283         /*
284          * If we don't see a Vcc regulator, assume it's a fixed
285          * voltage always-on regulator.
286          */
287         if (!host->vcc)
288                 return 0;
289 
290         if (mmc_slot(host).before_set_reg)
291                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
292 
293         if (host->pbias) {
294                 if (host->pbias_enabled == 1) {
295                         ret = regulator_disable(host->pbias);
296                         if (!ret)
297                                 host->pbias_enabled = 0;
298                 }
299                 regulator_set_voltage(host->pbias, VDD_3V0, VDD_3V0);
300         }
301 
302         /*
303          * Assume Vcc regulator is used only to power the card ... OMAP
304          * VDDS is used to power the pins, optionally with a transceiver to
305          * support cards using voltages other than VDDS (1.8V nominal).  When a
306          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
307          *
308          * In some cases this regulator won't support enable/disable;
309          * e.g. it's a fixed rail for a WLAN chip.
310          *
311          * In other cases vcc_aux switches interface power.  Example, for
312          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
313          * chips/cards need an interface voltage rail too.
314          */
315         if (power_on) {
316                 if (host->vcc)
317                         ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
318                 /* Enable interface voltage rail, if needed */
319                 if (ret == 0 && host->vcc_aux) {
320                         ret = regulator_enable(host->vcc_aux);
321                         if (ret < 0 && host->vcc)
322                                 ret = mmc_regulator_set_ocr(host->mmc,
323                                                         host->vcc, 0);
324                 }
325         } else {
326                 /* Shut down the rail */
327                 if (host->vcc_aux)
328                         ret = regulator_disable(host->vcc_aux);
329                 if (host->vcc) {
330                         /* Then proceed to shut down the local regulator */
331                         ret = mmc_regulator_set_ocr(host->mmc,
332                                                 host->vcc, 0);
333                 }
334         }
335 
336         if (host->pbias) {
337                 if (vdd <= VDD_165_195)
338                         ret = regulator_set_voltage(host->pbias, VDD_1V8,
339                                                                 VDD_1V8);
340                 else
341                         ret = regulator_set_voltage(host->pbias, VDD_3V0,
342                                                                 VDD_3V0);
343                 if (ret < 0)
344                         goto error_set_power;
345 
346                 if (host->pbias_enabled == 0) {
347                         ret = regulator_enable(host->pbias);
348                         if (!ret)
349                                 host->pbias_enabled = 1;
350                 }
351         }
352 
353         if (mmc_slot(host).after_set_reg)
354                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
355 
356 error_set_power:
357         return ret;
358 }
359 
360 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
361 {
362         struct regulator *reg;
363         int ocr_value = 0;
364 
365         reg = devm_regulator_get(host->dev, "vmmc");
366         if (IS_ERR(reg)) {
367                 dev_err(host->dev, "unable to get vmmc regulator %ld\n",
368                         PTR_ERR(reg));
369                 return PTR_ERR(reg);
370         } else {
371                 host->vcc = reg;
372                 ocr_value = mmc_regulator_get_ocrmask(reg);
373                 if (!mmc_slot(host).ocr_mask) {
374                         mmc_slot(host).ocr_mask = ocr_value;
375                 } else {
376                         if (!(mmc_slot(host).ocr_mask & ocr_value)) {
377                                 dev_err(host->dev, "ocrmask %x is not supported\n",
378                                         mmc_slot(host).ocr_mask);
379                                 mmc_slot(host).ocr_mask = 0;
380                                 return -EINVAL;
381                         }
382                 }
383         }
384         mmc_slot(host).set_power = omap_hsmmc_set_power;
385 
386         /* Allow an aux regulator */
387         reg = devm_regulator_get_optional(host->dev, "vmmc_aux");
388         host->vcc_aux = IS_ERR(reg) ? NULL : reg;
389 
390         reg = devm_regulator_get_optional(host->dev, "pbias");
391         host->pbias = IS_ERR(reg) ? NULL : reg;
392 
393         /* For eMMC do not power off when not in sleep state */
394         if (mmc_slot(host).no_regulator_off_init)
395                 return 0;
396         /*
397          * To disable boot_on regulator, enable regulator
398          * to increase usecount and then disable it.
399          */
400         if ((host->vcc && regulator_is_enabled(host->vcc) > 0) ||
401             (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
402                 int vdd = ffs(mmc_slot(host).ocr_mask) - 1;
403 
404                 mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd);
405                 mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
406         }
407 
408         return 0;
409 }
410 
411 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
412 {
413         mmc_slot(host).set_power = NULL;
414 }
415 
416 static inline int omap_hsmmc_have_reg(void)
417 {
418         return 1;
419 }
420 
421 #else
422 
423 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
424 {
425         return -EINVAL;
426 }
427 
428 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
429 {
430 }
431 
432 static inline int omap_hsmmc_have_reg(void)
433 {
434         return 0;
435 }
436 
437 #endif
438 
439 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
440 {
441         int ret;
442 
443         if (gpio_is_valid(pdata->slots[0].switch_pin)) {
444                 if (pdata->slots[0].cover)
445                         pdata->slots[0].get_cover_state =
446                                         omap_hsmmc_get_cover_state;
447                 else
448                         pdata->slots[0].card_detect = omap_hsmmc_card_detect;
449                 pdata->slots[0].card_detect_irq =
450                                 gpio_to_irq(pdata->slots[0].switch_pin);
451                 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
452                 if (ret)
453                         return ret;
454                 ret = gpio_direction_input(pdata->slots[0].switch_pin);
455                 if (ret)
456                         goto err_free_sp;
457         } else
458                 pdata->slots[0].switch_pin = -EINVAL;
459 
460         if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
461                 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
462                 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
463                 if (ret)
464                         goto err_free_cd;
465                 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
466                 if (ret)
467                         goto err_free_wp;
468         } else
469                 pdata->slots[0].gpio_wp = -EINVAL;
470 
471         return 0;
472 
473 err_free_wp:
474         gpio_free(pdata->slots[0].gpio_wp);
475 err_free_cd:
476         if (gpio_is_valid(pdata->slots[0].switch_pin))
477 err_free_sp:
478                 gpio_free(pdata->slots[0].switch_pin);
479         return ret;
480 }
481 
482 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
483 {
484         if (gpio_is_valid(pdata->slots[0].gpio_wp))
485                 gpio_free(pdata->slots[0].gpio_wp);
486         if (gpio_is_valid(pdata->slots[0].switch_pin))
487                 gpio_free(pdata->slots[0].switch_pin);
488 }
489 
490 /*
491  * Start clock to the card
492  */
493 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
494 {
495         OMAP_HSMMC_WRITE(host->base, SYSCTL,
496                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
497 }
498 
499 /*
500  * Stop clock to the card
501  */
502 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
503 {
504         OMAP_HSMMC_WRITE(host->base, SYSCTL,
505                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
506         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
507                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
508 }
509 
510 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
511                                   struct mmc_command *cmd)
512 {
513         unsigned int irq_mask;
514 
515         if (host->use_dma)
516                 irq_mask = INT_EN_MASK & ~(BRR_EN | BWR_EN);
517         else
518                 irq_mask = INT_EN_MASK;
519 
520         /* Disable timeout for erases */
521         if (cmd->opcode == MMC_ERASE)
522                 irq_mask &= ~DTO_EN;
523 
524         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
525         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
526         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
527 }
528 
529 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
530 {
531         OMAP_HSMMC_WRITE(host->base, ISE, 0);
532         OMAP_HSMMC_WRITE(host->base, IE, 0);
533         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
534 }
535 
536 /* Calculate divisor for the given clock frequency */
537 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
538 {
539         u16 dsor = 0;
540 
541         if (ios->clock) {
542                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
543                 if (dsor > CLKD_MAX)
544                         dsor = CLKD_MAX;
545         }
546 
547         return dsor;
548 }
549 
550 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
551 {
552         struct mmc_ios *ios = &host->mmc->ios;
553         unsigned long regval;
554         unsigned long timeout;
555         unsigned long clkdiv;
556 
557         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
558 
559         omap_hsmmc_stop_clock(host);
560 
561         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
562         regval = regval & ~(CLKD_MASK | DTO_MASK);
563         clkdiv = calc_divisor(host, ios);
564         regval = regval | (clkdiv << 6) | (DTO << 16);
565         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
566         OMAP_HSMMC_WRITE(host->base, SYSCTL,
567                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
568 
569         /* Wait till the ICS bit is set */
570         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
571         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
572                 && time_before(jiffies, timeout))
573                 cpu_relax();
574 
575         /*
576          * Enable High-Speed Support
577          * Pre-Requisites
578          *      - Controller should support High-Speed-Enable Bit
579          *      - Controller should not be using DDR Mode
580          *      - Controller should advertise that it supports High Speed
581          *        in capabilities register
582          *      - MMC/SD clock coming out of controller > 25MHz
583          */
584         if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) &&
585             (ios->timing != MMC_TIMING_UHS_DDR50) &&
586             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
587                 regval = OMAP_HSMMC_READ(host->base, HCTL);
588                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
589                         regval |= HSPE;
590                 else
591                         regval &= ~HSPE;
592 
593                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
594         }
595 
596         omap_hsmmc_start_clock(host);
597 }
598 
599 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
600 {
601         struct mmc_ios *ios = &host->mmc->ios;
602         u32 con;
603 
604         con = OMAP_HSMMC_READ(host->base, CON);
605         if (ios->timing == MMC_TIMING_UHS_DDR50)
606                 con |= DDR;     /* configure in DDR mode */
607         else
608                 con &= ~DDR;
609         switch (ios->bus_width) {
610         case MMC_BUS_WIDTH_8:
611                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
612                 break;
613         case MMC_BUS_WIDTH_4:
614                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
615                 OMAP_HSMMC_WRITE(host->base, HCTL,
616                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
617                 break;
618         case MMC_BUS_WIDTH_1:
619                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
620                 OMAP_HSMMC_WRITE(host->base, HCTL,
621                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
622                 break;
623         }
624 }
625 
626 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
627 {
628         struct mmc_ios *ios = &host->mmc->ios;
629         u32 con;
630 
631         con = OMAP_HSMMC_READ(host->base, CON);
632         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
633                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
634         else
635                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
636 }
637 
638 #ifdef CONFIG_PM
639 
640 /*
641  * Restore the MMC host context, if it was lost as result of a
642  * power state change.
643  */
644 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
645 {
646         struct mmc_ios *ios = &host->mmc->ios;
647         u32 hctl, capa;
648         unsigned long timeout;
649 
650         if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
651             host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
652             host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
653             host->capa == OMAP_HSMMC_READ(host->base, CAPA))
654                 return 0;
655 
656         host->context_loss++;
657 
658         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
659                 if (host->power_mode != MMC_POWER_OFF &&
660                     (1 << ios->vdd) <= MMC_VDD_23_24)
661                         hctl = SDVS18;
662                 else
663                         hctl = SDVS30;
664                 capa = VS30 | VS18;
665         } else {
666                 hctl = SDVS18;
667                 capa = VS18;
668         }
669 
670         OMAP_HSMMC_WRITE(host->base, HCTL,
671                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
672 
673         OMAP_HSMMC_WRITE(host->base, CAPA,
674                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
675 
676         OMAP_HSMMC_WRITE(host->base, HCTL,
677                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
678 
679         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
680         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
681                 && time_before(jiffies, timeout))
682                 ;
683 
684         omap_hsmmc_disable_irq(host);
685 
686         /* Do not initialize card-specific things if the power is off */
687         if (host->power_mode == MMC_POWER_OFF)
688                 goto out;
689 
690         omap_hsmmc_set_bus_width(host);
691 
692         omap_hsmmc_set_clock(host);
693 
694         omap_hsmmc_set_bus_mode(host);
695 
696 out:
697         dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
698                 host->context_loss);
699         return 0;
700 }
701 
702 /*
703  * Save the MMC host context (store the number of power state changes so far).
704  */
705 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
706 {
707         host->con =  OMAP_HSMMC_READ(host->base, CON);
708         host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
709         host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
710         host->capa = OMAP_HSMMC_READ(host->base, CAPA);
711 }
712 
713 #else
714 
715 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
716 {
717         return 0;
718 }
719 
720 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
721 {
722 }
723 
724 #endif
725 
726 /*
727  * Send init stream sequence to card
728  * before sending IDLE command
729  */
730 static void send_init_stream(struct omap_hsmmc_host *host)
731 {
732         int reg = 0;
733         unsigned long timeout;
734 
735         if (host->protect_card)
736                 return;
737 
738         disable_irq(host->irq);
739 
740         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
741         OMAP_HSMMC_WRITE(host->base, CON,
742                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
743         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
744 
745         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
746         while ((reg != CC_EN) && time_before(jiffies, timeout))
747                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
748 
749         OMAP_HSMMC_WRITE(host->base, CON,
750                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
751 
752         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
753         OMAP_HSMMC_READ(host->base, STAT);
754 
755         enable_irq(host->irq);
756 }
757 
758 static inline
759 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
760 {
761         int r = 1;
762 
763         if (mmc_slot(host).get_cover_state)
764                 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
765         return r;
766 }
767 
768 static ssize_t
769 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
770                            char *buf)
771 {
772         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
773         struct omap_hsmmc_host *host = mmc_priv(mmc);
774 
775         return sprintf(buf, "%s\n",
776                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
777 }
778 
779 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
780 
781 static ssize_t
782 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
783                         char *buf)
784 {
785         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
786         struct omap_hsmmc_host *host = mmc_priv(mmc);
787 
788         return sprintf(buf, "%s\n", mmc_slot(host).name);
789 }
790 
791 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
792 
793 /*
794  * Configure the response type and send the cmd.
795  */
796 static void
797 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
798         struct mmc_data *data)
799 {
800         int cmdreg = 0, resptype = 0, cmdtype = 0;
801 
802         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
803                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
804         host->cmd = cmd;
805 
806         omap_hsmmc_enable_irq(host, cmd);
807 
808         host->response_busy = 0;
809         if (cmd->flags & MMC_RSP_PRESENT) {
810                 if (cmd->flags & MMC_RSP_136)
811                         resptype = 1;
812                 else if (cmd->flags & MMC_RSP_BUSY) {
813                         resptype = 3;
814                         host->response_busy = 1;
815                 } else
816                         resptype = 2;
817         }
818 
819         /*
820          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
821          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
822          * a val of 0x3, rest 0x0.
823          */
824         if (cmd == host->mrq->stop)
825                 cmdtype = 0x3;
826 
827         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
828 
829         if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
830             host->mrq->sbc) {
831                 cmdreg |= ACEN_ACMD23;
832                 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
833         }
834         if (data) {
835                 cmdreg |= DP_SELECT | MSBS | BCE;
836                 if (data->flags & MMC_DATA_READ)
837                         cmdreg |= DDIR;
838                 else
839                         cmdreg &= ~(DDIR);
840         }
841 
842         if (host->use_dma)
843                 cmdreg |= DMAE;
844 
845         host->req_in_progress = 1;
846 
847         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
848         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
849 }
850 
851 static int
852 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
853 {
854         if (data->flags & MMC_DATA_WRITE)
855                 return DMA_TO_DEVICE;
856         else
857                 return DMA_FROM_DEVICE;
858 }
859 
860 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
861         struct mmc_data *data)
862 {
863         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
864 }
865 
866 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
867 {
868         int dma_ch;
869         unsigned long flags;
870 
871         spin_lock_irqsave(&host->irq_lock, flags);
872         host->req_in_progress = 0;
873         dma_ch = host->dma_ch;
874         spin_unlock_irqrestore(&host->irq_lock, flags);
875 
876         omap_hsmmc_disable_irq(host);
877         /* Do not complete the request if DMA is still in progress */
878         if (mrq->data && host->use_dma && dma_ch != -1)
879                 return;
880         host->mrq = NULL;
881         mmc_request_done(host->mmc, mrq);
882 }
883 
884 /*
885  * Notify the transfer complete to MMC core
886  */
887 static void
888 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
889 {
890         if (!data) {
891                 struct mmc_request *mrq = host->mrq;
892 
893                 /* TC before CC from CMD6 - don't know why, but it happens */
894                 if (host->cmd && host->cmd->opcode == 6 &&
895                     host->response_busy) {
896                         host->response_busy = 0;
897                         return;
898                 }
899 
900                 omap_hsmmc_request_done(host, mrq);
901                 return;
902         }
903 
904         host->data = NULL;
905 
906         if (!data->error)
907                 data->bytes_xfered += data->blocks * (data->blksz);
908         else
909                 data->bytes_xfered = 0;
910 
911         if (data->stop && (data->error || !host->mrq->sbc))
912                 omap_hsmmc_start_command(host, data->stop, NULL);
913         else
914                 omap_hsmmc_request_done(host, data->mrq);
915 }
916 
917 /*
918  * Notify the core about command completion
919  */
920 static void
921 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
922 {
923         host->cmd = NULL;
924 
925         if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
926             !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
927                 omap_hsmmc_start_dma_transfer(host);
928                 omap_hsmmc_start_command(host, host->mrq->cmd,
929                                                 host->mrq->data);
930                 return;
931         }
932 
933         if (cmd->flags & MMC_RSP_PRESENT) {
934                 if (cmd->flags & MMC_RSP_136) {
935                         /* response type 2 */
936                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
937                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
938                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
939                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
940                 } else {
941                         /* response types 1, 1b, 3, 4, 5, 6 */
942                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
943                 }
944         }
945         if ((host->data == NULL && !host->response_busy) || cmd->error)
946                 omap_hsmmc_request_done(host, host->mrq);
947 }
948 
949 /*
950  * DMA clean up for command errors
951  */
952 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
953 {
954         int dma_ch;
955         unsigned long flags;
956 
957         host->data->error = errno;
958 
959         spin_lock_irqsave(&host->irq_lock, flags);
960         dma_ch = host->dma_ch;
961         host->dma_ch = -1;
962         spin_unlock_irqrestore(&host->irq_lock, flags);
963 
964         if (host->use_dma && dma_ch != -1) {
965                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
966 
967                 dmaengine_terminate_all(chan);
968                 dma_unmap_sg(chan->device->dev,
969                         host->data->sg, host->data->sg_len,
970                         omap_hsmmc_get_dma_dir(host, host->data));
971 
972                 host->data->host_cookie = 0;
973         }
974         host->data = NULL;
975 }
976 
977 /*
978  * Readable error output
979  */
980 #ifdef CONFIG_MMC_DEBUG
981 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
982 {
983         /* --- means reserved bit without definition at documentation */
984         static const char *omap_hsmmc_status_bits[] = {
985                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
986                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
987                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
988                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
989         };
990         char res[256];
991         char *buf = res;
992         int len, i;
993 
994         len = sprintf(buf, "MMC IRQ 0x%x :", status);
995         buf += len;
996 
997         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
998                 if (status & (1 << i)) {
999                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1000                         buf += len;
1001                 }
1002 
1003         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
1004 }
1005 #else
1006 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1007                                              u32 status)
1008 {
1009 }
1010 #endif  /* CONFIG_MMC_DEBUG */
1011 
1012 /*
1013  * MMC controller internal state machines reset
1014  *
1015  * Used to reset command or data internal state machines, using respectively
1016  *  SRC or SRD bit of SYSCTL register
1017  * Can be called from interrupt context
1018  */
1019 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1020                                                    unsigned long bit)
1021 {
1022         unsigned long i = 0;
1023         unsigned long limit = MMC_TIMEOUT_US;
1024 
1025         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1026                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1027 
1028         /*
1029          * OMAP4 ES2 and greater has an updated reset logic.
1030          * Monitor a 0->1 transition first
1031          */
1032         if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
1033                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1034                                         && (i++ < limit))
1035                         udelay(1);
1036         }
1037         i = 0;
1038 
1039         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1040                 (i++ < limit))
1041                 udelay(1);
1042 
1043         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1044                 dev_err(mmc_dev(host->mmc),
1045                         "Timeout waiting on controller reset in %s\n",
1046                         __func__);
1047 }
1048 
1049 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1050                                         int err, int end_cmd)
1051 {
1052         if (end_cmd) {
1053                 omap_hsmmc_reset_controller_fsm(host, SRC);
1054                 if (host->cmd)
1055                         host->cmd->error = err;
1056         }
1057 
1058         if (host->data) {
1059                 omap_hsmmc_reset_controller_fsm(host, SRD);
1060                 omap_hsmmc_dma_cleanup(host, err);
1061         } else if (host->mrq && host->mrq->cmd)
1062                 host->mrq->cmd->error = err;
1063 }
1064 
1065 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1066 {
1067         struct mmc_data *data;
1068         int end_cmd = 0, end_trans = 0;
1069         int error = 0;
1070 
1071         data = host->data;
1072         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1073 
1074         if (status & ERR_EN) {
1075                 omap_hsmmc_dbg_report_irq(host, status);
1076 
1077                 if (status & (CTO_EN | CCRC_EN))
1078                         end_cmd = 1;
1079                 if (status & (CTO_EN | DTO_EN))
1080                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1081                 else if (status & (CCRC_EN | DCRC_EN))
1082                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1083 
1084                 if (status & ACE_EN) {
1085                         u32 ac12;
1086                         ac12 = OMAP_HSMMC_READ(host->base, AC12);
1087                         if (!(ac12 & ACNE) && host->mrq->sbc) {
1088                                 end_cmd = 1;
1089                                 if (ac12 & ACTO)
1090                                         error =  -ETIMEDOUT;
1091                                 else if (ac12 & (ACCE | ACEB | ACIE))
1092                                         error = -EILSEQ;
1093                                 host->mrq->sbc->error = error;
1094                                 hsmmc_command_incomplete(host, error, end_cmd);
1095                         }
1096                         dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
1097                 }
1098                 if (host->data || host->response_busy) {
1099                         end_trans = !end_cmd;
1100                         host->response_busy = 0;
1101                 }
1102         }
1103 
1104         OMAP_HSMMC_WRITE(host->base, STAT, status);
1105         if (end_cmd || ((status & CC_EN) && host->cmd))
1106                 omap_hsmmc_cmd_done(host, host->cmd);
1107         if ((end_trans || (status & TC_EN)) && host->mrq)
1108                 omap_hsmmc_xfer_done(host, data);
1109 }
1110 
1111 /*
1112  * MMC controller IRQ handler
1113  */
1114 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1115 {
1116         struct omap_hsmmc_host *host = dev_id;
1117         int status;
1118 
1119         status = OMAP_HSMMC_READ(host->base, STAT);
1120         while (status & INT_EN_MASK && host->req_in_progress) {
1121                 omap_hsmmc_do_irq(host, status);
1122 
1123                 /* Flush posted write */
1124                 status = OMAP_HSMMC_READ(host->base, STAT);
1125         }
1126 
1127         return IRQ_HANDLED;
1128 }
1129 
1130 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1131 {
1132         unsigned long i;
1133 
1134         OMAP_HSMMC_WRITE(host->base, HCTL,
1135                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1136         for (i = 0; i < loops_per_jiffy; i++) {
1137                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1138                         break;
1139                 cpu_relax();
1140         }
1141 }
1142 
1143 /*
1144  * Switch MMC interface voltage ... only relevant for MMC1.
1145  *
1146  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1147  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1148  * Some chips, like eMMC ones, use internal transceivers.
1149  */
1150 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1151 {
1152         u32 reg_val = 0;
1153         int ret;
1154 
1155         /* Disable the clocks */
1156         pm_runtime_put_sync(host->dev);
1157         if (host->dbclk)
1158                 clk_disable_unprepare(host->dbclk);
1159 
1160         /* Turn the power off */
1161         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1162 
1163         /* Turn the power ON with given VDD 1.8 or 3.0v */
1164         if (!ret)
1165                 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1166                                                vdd);
1167         pm_runtime_get_sync(host->dev);
1168         if (host->dbclk)
1169                 clk_prepare_enable(host->dbclk);
1170 
1171         if (ret != 0)
1172                 goto err;
1173 
1174         OMAP_HSMMC_WRITE(host->base, HCTL,
1175                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1176         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1177 
1178         /*
1179          * If a MMC dual voltage card is detected, the set_ios fn calls
1180          * this fn with VDD bit set for 1.8V. Upon card removal from the
1181          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1182          *
1183          * Cope with a bit of slop in the range ... per data sheets:
1184          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1185          *    but recommended values are 1.71V to 1.89V
1186          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1187          *    but recommended values are 2.7V to 3.3V
1188          *
1189          * Board setup code shouldn't permit anything very out-of-range.
1190          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1191          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1192          */
1193         if ((1 << vdd) <= MMC_VDD_23_24)
1194                 reg_val |= SDVS18;
1195         else
1196                 reg_val |= SDVS30;
1197 
1198         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1199         set_sd_bus_power(host);
1200 
1201         return 0;
1202 err:
1203         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1204         return ret;
1205 }
1206 
1207 /* Protect the card while the cover is open */
1208 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1209 {
1210         if (!mmc_slot(host).get_cover_state)
1211                 return;
1212 
1213         host->reqs_blocked = 0;
1214         if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1215                 if (host->protect_card) {
1216                         dev_info(host->dev, "%s: cover is closed, "
1217                                          "card is now accessible\n",
1218                                          mmc_hostname(host->mmc));
1219                         host->protect_card = 0;
1220                 }
1221         } else {
1222                 if (!host->protect_card) {
1223                         dev_info(host->dev, "%s: cover is open, "
1224                                          "card is now inaccessible\n",
1225                                          mmc_hostname(host->mmc));
1226                         host->protect_card = 1;
1227                 }
1228         }
1229 }
1230 
1231 /*
1232  * irq handler to notify the core about card insertion/removal
1233  */
1234 static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
1235 {
1236         struct omap_hsmmc_host *host = dev_id;
1237         struct omap_mmc_slot_data *slot = &mmc_slot(host);
1238         int carddetect;
1239 
1240         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1241 
1242         if (slot->card_detect)
1243                 carddetect = slot->card_detect(host->dev, host->slot_id);
1244         else {
1245                 omap_hsmmc_protect_card(host);
1246                 carddetect = -ENOSYS;
1247         }
1248 
1249         if (carddetect)
1250                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1251         else
1252                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1253         return IRQ_HANDLED;
1254 }
1255 
1256 static void omap_hsmmc_dma_callback(void *param)
1257 {
1258         struct omap_hsmmc_host *host = param;
1259         struct dma_chan *chan;
1260         struct mmc_data *data;
1261         int req_in_progress;
1262 
1263         spin_lock_irq(&host->irq_lock);
1264         if (host->dma_ch < 0) {
1265                 spin_unlock_irq(&host->irq_lock);
1266                 return;
1267         }
1268 
1269         data = host->mrq->data;
1270         chan = omap_hsmmc_get_dma_chan(host, data);
1271         if (!data->host_cookie)
1272                 dma_unmap_sg(chan->device->dev,
1273                              data->sg, data->sg_len,
1274                              omap_hsmmc_get_dma_dir(host, data));
1275 
1276         req_in_progress = host->req_in_progress;
1277         host->dma_ch = -1;
1278         spin_unlock_irq(&host->irq_lock);
1279 
1280         /* If DMA has finished after TC, complete the request */
1281         if (!req_in_progress) {
1282                 struct mmc_request *mrq = host->mrq;
1283 
1284                 host->mrq = NULL;
1285                 mmc_request_done(host->mmc, mrq);
1286         }
1287 }
1288 
1289 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1290                                        struct mmc_data *data,
1291                                        struct omap_hsmmc_next *next,
1292                                        struct dma_chan *chan)
1293 {
1294         int dma_len;
1295 
1296         if (!next && data->host_cookie &&
1297             data->host_cookie != host->next_data.cookie) {
1298                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1299                        " host->next_data.cookie %d\n",
1300                        __func__, data->host_cookie, host->next_data.cookie);
1301                 data->host_cookie = 0;
1302         }
1303 
1304         /* Check if next job is already prepared */
1305         if (next || data->host_cookie != host->next_data.cookie) {
1306                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1307                                      omap_hsmmc_get_dma_dir(host, data));
1308 
1309         } else {
1310                 dma_len = host->next_data.dma_len;
1311                 host->next_data.dma_len = 0;
1312         }
1313 
1314 
1315         if (dma_len == 0)
1316                 return -EINVAL;
1317 
1318         if (next) {
1319                 next->dma_len = dma_len;
1320                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1321         } else
1322                 host->dma_len = dma_len;
1323 
1324         return 0;
1325 }
1326 
1327 /*
1328  * Routine to configure and start DMA for the MMC card
1329  */
1330 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
1331                                         struct mmc_request *req)
1332 {
1333         struct dma_slave_config cfg;
1334         struct dma_async_tx_descriptor *tx;
1335         int ret = 0, i;
1336         struct mmc_data *data = req->data;
1337         struct dma_chan *chan;
1338 
1339         /* Sanity check: all the SG entries must be aligned by block size. */
1340         for (i = 0; i < data->sg_len; i++) {
1341                 struct scatterlist *sgl;
1342 
1343                 sgl = data->sg + i;
1344                 if (sgl->length % data->blksz)
1345                         return -EINVAL;
1346         }
1347         if ((data->blksz % 4) != 0)
1348                 /* REVISIT: The MMC buffer increments only when MSB is written.
1349                  * Return error for blksz which is non multiple of four.
1350                  */
1351                 return -EINVAL;
1352 
1353         BUG_ON(host->dma_ch != -1);
1354 
1355         chan = omap_hsmmc_get_dma_chan(host, data);
1356 
1357         cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
1358         cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
1359         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1360         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1361         cfg.src_maxburst = data->blksz / 4;
1362         cfg.dst_maxburst = data->blksz / 4;
1363 
1364         ret = dmaengine_slave_config(chan, &cfg);
1365         if (ret)
1366                 return ret;
1367 
1368         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1369         if (ret)
1370                 return ret;
1371 
1372         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1373                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1374                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1375         if (!tx) {
1376                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1377                 /* FIXME: cleanup */
1378                 return -1;
1379         }
1380 
1381         tx->callback = omap_hsmmc_dma_callback;
1382         tx->callback_param = host;
1383 
1384         /* Does not fail */
1385         dmaengine_submit(tx);
1386 
1387         host->dma_ch = 1;
1388 
1389         return 0;
1390 }
1391 
1392 static void set_data_timeout(struct omap_hsmmc_host *host,
1393                              unsigned int timeout_ns,
1394                              unsigned int timeout_clks)
1395 {
1396         unsigned int timeout, cycle_ns;
1397         uint32_t reg, clkd, dto = 0;
1398 
1399         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1400         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1401         if (clkd == 0)
1402                 clkd = 1;
1403 
1404         cycle_ns = 1000000000 / (host->clk_rate / clkd);
1405         timeout = timeout_ns / cycle_ns;
1406         timeout += timeout_clks;
1407         if (timeout) {
1408                 while ((timeout & 0x80000000) == 0) {
1409                         dto += 1;
1410                         timeout <<= 1;
1411                 }
1412                 dto = 31 - dto;
1413                 timeout <<= 1;
1414                 if (timeout && dto)
1415                         dto += 1;
1416                 if (dto >= 13)
1417                         dto -= 13;
1418                 else
1419                         dto = 0;
1420                 if (dto > 14)
1421                         dto = 14;
1422         }
1423 
1424         reg &= ~DTO_MASK;
1425         reg |= dto << DTO_SHIFT;
1426         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1427 }
1428 
1429 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
1430 {
1431         struct mmc_request *req = host->mrq;
1432         struct dma_chan *chan;
1433 
1434         if (!req->data)
1435                 return;
1436         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1437                                 | (req->data->blocks << 16));
1438         set_data_timeout(host, req->data->timeout_ns,
1439                                 req->data->timeout_clks);
1440         chan = omap_hsmmc_get_dma_chan(host, req->data);
1441         dma_async_issue_pending(chan);
1442 }
1443 
1444 /*
1445  * Configure block length for MMC/SD cards and initiate the transfer.
1446  */
1447 static int
1448 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1449 {
1450         int ret;
1451         host->data = req->data;
1452 
1453         if (req->data == NULL) {
1454                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1455                 /*
1456                  * Set an arbitrary 100ms data timeout for commands with
1457                  * busy signal.
1458                  */
1459                 if (req->cmd->flags & MMC_RSP_BUSY)
1460                         set_data_timeout(host, 100000000U, 0);
1461                 return 0;
1462         }
1463 
1464         if (host->use_dma) {
1465                 ret = omap_hsmmc_setup_dma_transfer(host, req);
1466                 if (ret != 0) {
1467                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1468                         return ret;
1469                 }
1470         }
1471         return 0;
1472 }
1473 
1474 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1475                                 int err)
1476 {
1477         struct omap_hsmmc_host *host = mmc_priv(mmc);
1478         struct mmc_data *data = mrq->data;
1479 
1480         if (host->use_dma && data->host_cookie) {
1481                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1482 
1483                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1484                              omap_hsmmc_get_dma_dir(host, data));
1485                 data->host_cookie = 0;
1486         }
1487 }
1488 
1489 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1490                                bool is_first_req)
1491 {
1492         struct omap_hsmmc_host *host = mmc_priv(mmc);
1493 
1494         if (mrq->data->host_cookie) {
1495                 mrq->data->host_cookie = 0;
1496                 return ;
1497         }
1498 
1499         if (host->use_dma) {
1500                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1501 
1502                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1503                                                 &host->next_data, c))
1504                         mrq->data->host_cookie = 0;
1505         }
1506 }
1507 
1508 /*
1509  * Request function. for read/write operation
1510  */
1511 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1512 {
1513         struct omap_hsmmc_host *host = mmc_priv(mmc);
1514         int err;
1515 
1516         BUG_ON(host->req_in_progress);
1517         BUG_ON(host->dma_ch != -1);
1518         if (host->protect_card) {
1519                 if (host->reqs_blocked < 3) {
1520                         /*
1521                          * Ensure the controller is left in a consistent
1522                          * state by resetting the command and data state
1523                          * machines.
1524                          */
1525                         omap_hsmmc_reset_controller_fsm(host, SRD);
1526                         omap_hsmmc_reset_controller_fsm(host, SRC);
1527                         host->reqs_blocked += 1;
1528                 }
1529                 req->cmd->error = -EBADF;
1530                 if (req->data)
1531                         req->data->error = -EBADF;
1532                 req->cmd->retries = 0;
1533                 mmc_request_done(mmc, req);
1534                 return;
1535         } else if (host->reqs_blocked)
1536                 host->reqs_blocked = 0;
1537         WARN_ON(host->mrq != NULL);
1538         host->mrq = req;
1539         host->clk_rate = clk_get_rate(host->fclk);
1540         err = omap_hsmmc_prepare_data(host, req);
1541         if (err) {
1542                 req->cmd->error = err;
1543                 if (req->data)
1544                         req->data->error = err;
1545                 host->mrq = NULL;
1546                 mmc_request_done(mmc, req);
1547                 return;
1548         }
1549         if (req->sbc && !(host->flags & AUTO_CMD23)) {
1550                 omap_hsmmc_start_command(host, req->sbc, NULL);
1551                 return;
1552         }
1553 
1554         omap_hsmmc_start_dma_transfer(host);
1555         omap_hsmmc_start_command(host, req->cmd, req->data);
1556 }
1557 
1558 /* Routine to configure clock values. Exposed API to core */
1559 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1560 {
1561         struct omap_hsmmc_host *host = mmc_priv(mmc);
1562         int do_send_init_stream = 0;
1563 
1564         pm_runtime_get_sync(host->dev);
1565 
1566         if (ios->power_mode != host->power_mode) {
1567                 switch (ios->power_mode) {
1568                 case MMC_POWER_OFF:
1569                         mmc_slot(host).set_power(host->dev, host->slot_id,
1570                                                  0, 0);
1571                         break;
1572                 case MMC_POWER_UP:
1573                         mmc_slot(host).set_power(host->dev, host->slot_id,
1574                                                  1, ios->vdd);
1575                         break;
1576                 case MMC_POWER_ON:
1577                         do_send_init_stream = 1;
1578                         break;
1579                 }
1580                 host->power_mode = ios->power_mode;
1581         }
1582 
1583         /* FIXME: set registers based only on changes to ios */
1584 
1585         omap_hsmmc_set_bus_width(host);
1586 
1587         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1588                 /* Only MMC1 can interface at 3V without some flavor
1589                  * of external transceiver; but they all handle 1.8V.
1590                  */
1591                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1592                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1593                                 /*
1594                                  * The mmc_select_voltage fn of the core does
1595                                  * not seem to set the power_mode to
1596                                  * MMC_POWER_UP upon recalculating the voltage.
1597                                  * vdd 1.8v.
1598                                  */
1599                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1600                                 dev_dbg(mmc_dev(host->mmc),
1601                                                 "Switch operation failed\n");
1602                 }
1603         }
1604 
1605         omap_hsmmc_set_clock(host);
1606 
1607         if (do_send_init_stream)
1608                 send_init_stream(host);
1609 
1610         omap_hsmmc_set_bus_mode(host);
1611 
1612         pm_runtime_put_autosuspend(host->dev);
1613 }
1614 
1615 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1616 {
1617         struct omap_hsmmc_host *host = mmc_priv(mmc);
1618 
1619         if (!mmc_slot(host).card_detect)
1620                 return -ENOSYS;
1621         return mmc_slot(host).card_detect(host->dev, host->slot_id);
1622 }
1623 
1624 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1625 {
1626         struct omap_hsmmc_host *host = mmc_priv(mmc);
1627 
1628         if (!mmc_slot(host).get_ro)
1629                 return -ENOSYS;
1630         return mmc_slot(host).get_ro(host->dev, 0);
1631 }
1632 
1633 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1634 {
1635         struct omap_hsmmc_host *host = mmc_priv(mmc);
1636 
1637         if (mmc_slot(host).init_card)
1638                 mmc_slot(host).init_card(card);
1639 }
1640 
1641 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1642 {
1643         u32 hctl, capa, value;
1644 
1645         /* Only MMC1 supports 3.0V */
1646         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1647                 hctl = SDVS30;
1648                 capa = VS30 | VS18;
1649         } else {
1650                 hctl = SDVS18;
1651                 capa = VS18;
1652         }
1653 
1654         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1655         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1656 
1657         value = OMAP_HSMMC_READ(host->base, CAPA);
1658         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1659 
1660         /* Set SD bus power bit */
1661         set_sd_bus_power(host);
1662 }
1663 
1664 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1665 {
1666         struct omap_hsmmc_host *host = mmc_priv(mmc);
1667 
1668         pm_runtime_get_sync(host->dev);
1669 
1670         return 0;
1671 }
1672 
1673 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
1674 {
1675         struct omap_hsmmc_host *host = mmc_priv(mmc);
1676 
1677         pm_runtime_mark_last_busy(host->dev);
1678         pm_runtime_put_autosuspend(host->dev);
1679 
1680         return 0;
1681 }
1682 
1683 static const struct mmc_host_ops omap_hsmmc_ops = {
1684         .enable = omap_hsmmc_enable_fclk,
1685         .disable = omap_hsmmc_disable_fclk,
1686         .post_req = omap_hsmmc_post_req,
1687         .pre_req = omap_hsmmc_pre_req,
1688         .request = omap_hsmmc_request,
1689         .set_ios = omap_hsmmc_set_ios,
1690         .get_cd = omap_hsmmc_get_cd,
1691         .get_ro = omap_hsmmc_get_ro,
1692         .init_card = omap_hsmmc_init_card,
1693         /* NYET -- enable_sdio_irq */
1694 };
1695 
1696 #ifdef CONFIG_DEBUG_FS
1697 
1698 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1699 {
1700         struct mmc_host *mmc = s->private;
1701         struct omap_hsmmc_host *host = mmc_priv(mmc);
1702 
1703         seq_printf(s, "mmc%d:\n ctx_loss:\t%d\n\nregs:\n",
1704                         mmc->index, host->context_loss);
1705 
1706         pm_runtime_get_sync(host->dev);
1707 
1708         seq_printf(s, "CON:\t\t0x%08x\n",
1709                         OMAP_HSMMC_READ(host->base, CON));
1710         seq_printf(s, "HCTL:\t\t0x%08x\n",
1711                         OMAP_HSMMC_READ(host->base, HCTL));
1712         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1713                         OMAP_HSMMC_READ(host->base, SYSCTL));
1714         seq_printf(s, "IE:\t\t0x%08x\n",
1715                         OMAP_HSMMC_READ(host->base, IE));
1716         seq_printf(s, "ISE:\t\t0x%08x\n",
1717                         OMAP_HSMMC_READ(host->base, ISE));
1718         seq_printf(s, "CAPA:\t\t0x%08x\n",
1719                         OMAP_HSMMC_READ(host->base, CAPA));
1720 
1721         pm_runtime_mark_last_busy(host->dev);
1722         pm_runtime_put_autosuspend(host->dev);
1723 
1724         return 0;
1725 }
1726 
1727 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1728 {
1729         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1730 }
1731 
1732 static const struct file_operations mmc_regs_fops = {
1733         .open           = omap_hsmmc_regs_open,
1734         .read           = seq_read,
1735         .llseek         = seq_lseek,
1736         .release        = single_release,
1737 };
1738 
1739 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1740 {
1741         if (mmc->debugfs_root)
1742                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1743                         mmc, &mmc_regs_fops);
1744 }
1745 
1746 #else
1747 
1748 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1749 {
1750 }
1751 
1752 #endif
1753 
1754 #ifdef CONFIG_OF
1755 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
1756         /* See 35xx errata 2.1.1.128 in SPRZ278F */
1757         .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
1758 };
1759 
1760 static const struct omap_mmc_of_data omap4_mmc_of_data = {
1761         .reg_offset = 0x100,
1762 };
1763 
1764 static const struct of_device_id omap_mmc_of_match[] = {
1765         {
1766                 .compatible = "ti,omap2-hsmmc",
1767         },
1768         {
1769                 .compatible = "ti,omap3-pre-es3-hsmmc",
1770                 .data = &omap3_pre_es3_mmc_of_data,
1771         },
1772         {
1773                 .compatible = "ti,omap3-hsmmc",
1774         },
1775         {
1776                 .compatible = "ti,omap4-hsmmc",
1777                 .data = &omap4_mmc_of_data,
1778         },
1779         {},
1780 };
1781 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1782 
1783 static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1784 {
1785         struct omap_mmc_platform_data *pdata;
1786         struct device_node *np = dev->of_node;
1787         u32 bus_width, max_freq;
1788         int cd_gpio, wp_gpio;
1789 
1790         cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
1791         wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
1792         if (cd_gpio == -EPROBE_DEFER || wp_gpio == -EPROBE_DEFER)
1793                 return ERR_PTR(-EPROBE_DEFER);
1794 
1795         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1796         if (!pdata)
1797                 return ERR_PTR(-ENOMEM); /* out of memory */
1798 
1799         if (of_find_property(np, "ti,dual-volt", NULL))
1800                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1801 
1802         /* This driver only supports 1 slot */
1803         pdata->nr_slots = 1;
1804         pdata->slots[0].switch_pin = cd_gpio;
1805         pdata->slots[0].gpio_wp = wp_gpio;
1806 
1807         if (of_find_property(np, "ti,non-removable", NULL)) {
1808                 pdata->slots[0].nonremovable = true;
1809                 pdata->slots[0].no_regulator_off_init = true;
1810         }
1811         of_property_read_u32(np, "bus-width", &bus_width);
1812         if (bus_width == 4)
1813                 pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
1814         else if (bus_width == 8)
1815                 pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
1816 
1817         if (of_find_property(np, "ti,needs-special-reset", NULL))
1818                 pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
1819 
1820         if (!of_property_read_u32(np, "max-frequency", &max_freq))
1821                 pdata->max_freq = max_freq;
1822 
1823         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
1824                 pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT;
1825 
1826         if (of_find_property(np, "keep-power-in-suspend", NULL))
1827                 pdata->slots[0].pm_caps |= MMC_PM_KEEP_POWER;
1828 
1829         if (of_find_property(np, "enable-sdio-wakeup", NULL))
1830                 pdata->slots[0].pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
1831 
1832         return pdata;
1833 }
1834 #else
1835 static inline struct omap_mmc_platform_data
1836                         *of_get_hsmmc_pdata(struct device *dev)
1837 {
1838         return ERR_PTR(-EINVAL);
1839 }
1840 #endif
1841 
1842 static int omap_hsmmc_probe(struct platform_device *pdev)
1843 {
1844         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1845         struct mmc_host *mmc;
1846         struct omap_hsmmc_host *host = NULL;
1847         struct resource *res;
1848         int ret, irq;
1849         const struct of_device_id *match;
1850         dma_cap_mask_t mask;
1851         unsigned tx_req, rx_req;
1852         struct pinctrl *pinctrl;
1853         const struct omap_mmc_of_data *data;
1854 
1855         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
1856         if (match) {
1857                 pdata = of_get_hsmmc_pdata(&pdev->dev);
1858 
1859                 if (IS_ERR(pdata))
1860                         return PTR_ERR(pdata);
1861 
1862                 if (match->data) {
1863                         data = match->data;
1864                         pdata->reg_offset = data->reg_offset;
1865                         pdata->controller_flags |= data->controller_flags;
1866                 }
1867         }
1868 
1869         if (pdata == NULL) {
1870                 dev_err(&pdev->dev, "Platform Data is missing\n");
1871                 return -ENXIO;
1872         }
1873 
1874         if (pdata->nr_slots == 0) {
1875                 dev_err(&pdev->dev, "No Slots\n");
1876                 return -ENXIO;
1877         }
1878 
1879         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1880         irq = platform_get_irq(pdev, 0);
1881         if (res == NULL || irq < 0)
1882                 return -ENXIO;
1883 
1884         res = request_mem_region(res->start, resource_size(res), pdev->name);
1885         if (res == NULL)
1886                 return -EBUSY;
1887 
1888         ret = omap_hsmmc_gpio_init(pdata);
1889         if (ret)
1890                 goto err;
1891 
1892         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1893         if (!mmc) {
1894                 ret = -ENOMEM;
1895                 goto err_alloc;
1896         }
1897 
1898         host            = mmc_priv(mmc);
1899         host->mmc       = mmc;
1900         host->pdata     = pdata;
1901         host->dev       = &pdev->dev;
1902         host->use_dma   = 1;
1903         host->dma_ch    = -1;
1904         host->irq       = irq;
1905         host->slot_id   = 0;
1906         host->mapbase   = res->start + pdata->reg_offset;
1907         host->base      = ioremap(host->mapbase, SZ_4K);
1908         host->power_mode = MMC_POWER_OFF;
1909         host->next_data.cookie = 1;
1910         host->pbias_enabled = 0;
1911 
1912         platform_set_drvdata(pdev, host);
1913 
1914         mmc->ops        = &omap_hsmmc_ops;
1915 
1916         mmc->f_min = OMAP_MMC_MIN_CLOCK;
1917 
1918         if (pdata->max_freq > 0)
1919                 mmc->f_max = pdata->max_freq;
1920         else
1921                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
1922 
1923         spin_lock_init(&host->irq_lock);
1924 
1925         host->fclk = clk_get(&pdev->dev, "fck");
1926         if (IS_ERR(host->fclk)) {
1927                 ret = PTR_ERR(host->fclk);
1928                 host->fclk = NULL;
1929                 goto err1;
1930         }
1931 
1932         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
1933                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
1934                 mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
1935         }
1936 
1937         pm_runtime_enable(host->dev);
1938         pm_runtime_get_sync(host->dev);
1939         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
1940         pm_runtime_use_autosuspend(host->dev);
1941 
1942         omap_hsmmc_context_save(host);
1943 
1944         host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1945         /*
1946          * MMC can still work without debounce clock.
1947          */
1948         if (IS_ERR(host->dbclk)) {
1949                 host->dbclk = NULL;
1950         } else if (clk_prepare_enable(host->dbclk) != 0) {
1951                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
1952                 clk_put(host->dbclk);
1953                 host->dbclk = NULL;
1954         }
1955 
1956         /* Since we do only SG emulation, we can have as many segs
1957          * as we want. */
1958         mmc->max_segs = 1024;
1959 
1960         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1961         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1962         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1963         mmc->max_seg_size = mmc->max_req_size;
1964 
1965         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1966                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
1967 
1968         mmc->caps |= mmc_slot(host).caps;
1969         if (mmc->caps & MMC_CAP_8_BIT_DATA)
1970                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1971 
1972         if (mmc_slot(host).nonremovable)
1973                 mmc->caps |= MMC_CAP_NONREMOVABLE;
1974 
1975         mmc->pm_caps = mmc_slot(host).pm_caps;
1976 
1977         omap_hsmmc_conf_bus_power(host);
1978 
1979         if (!pdev->dev.of_node) {
1980                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1981                 if (!res) {
1982                         dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
1983                         ret = -ENXIO;
1984                         goto err_irq;
1985                 }
1986                 tx_req = res->start;
1987 
1988                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1989                 if (!res) {
1990                         dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
1991                         ret = -ENXIO;
1992                         goto err_irq;
1993                 }
1994                 rx_req = res->start;
1995         }
1996 
1997         dma_cap_zero(mask);
1998         dma_cap_set(DMA_SLAVE, mask);
1999 
2000         host->rx_chan =
2001                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2002                                                  &rx_req, &pdev->dev, "rx");
2003 
2004         if (!host->rx_chan) {
2005                 dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
2006                 ret = -ENXIO;
2007                 goto err_irq;
2008         }
2009 
2010         host->tx_chan =
2011                 dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
2012                                                  &tx_req, &pdev->dev, "tx");
2013 
2014         if (!host->tx_chan) {
2015                 dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
2016                 ret = -ENXIO;
2017                 goto err_irq;
2018         }
2019 
2020         /* Request IRQ for MMC operations */
2021         ret = request_irq(host->irq, omap_hsmmc_irq, 0,
2022                         mmc_hostname(mmc), host);
2023         if (ret) {
2024                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2025                 goto err_irq;
2026         }
2027 
2028         if (pdata->init != NULL) {
2029                 if (pdata->init(&pdev->dev) != 0) {
2030                         dev_err(mmc_dev(host->mmc),
2031                                 "Unable to configure MMC IRQs\n");
2032                         goto err_irq_cd_init;
2033                 }
2034         }
2035 
2036         if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2037                 ret = omap_hsmmc_reg_get(host);
2038                 if (ret)
2039                         goto err_reg;
2040                 host->use_reg = 1;
2041         }
2042 
2043         mmc->ocr_avail = mmc_slot(host).ocr_mask;
2044 
2045         /* Request IRQ for card detect */
2046         if ((mmc_slot(host).card_detect_irq)) {
2047                 ret = request_threaded_irq(mmc_slot(host).card_detect_irq,
2048                                            NULL,
2049                                            omap_hsmmc_detect,
2050                                            IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
2051                                            mmc_hostname(mmc), host);
2052                 if (ret) {
2053                         dev_err(mmc_dev(host->mmc),
2054                                 "Unable to grab MMC CD IRQ\n");
2055                         goto err_irq_cd;
2056                 }
2057                 pdata->suspend = omap_hsmmc_suspend_cdirq;
2058                 pdata->resume = omap_hsmmc_resume_cdirq;
2059         }
2060 
2061         omap_hsmmc_disable_irq(host);
2062 
2063         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
2064         if (IS_ERR(pinctrl))
2065                 dev_warn(&pdev->dev,
2066                         "pins are not configured from the driver\n");
2067 
2068         omap_hsmmc_protect_card(host);
2069 
2070         mmc_add_host(mmc);
2071 
2072         if (mmc_slot(host).name != NULL) {
2073                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2074                 if (ret < 0)
2075                         goto err_slot_name;
2076         }
2077         if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2078                 ret = device_create_file(&mmc->class_dev,
2079                                         &dev_attr_cover_switch);
2080                 if (ret < 0)
2081                         goto err_slot_name;
2082         }
2083 
2084         omap_hsmmc_debugfs(mmc);
2085         pm_runtime_mark_last_busy(host->dev);
2086         pm_runtime_put_autosuspend(host->dev);
2087 
2088         return 0;
2089 
2090 err_slot_name:
2091         mmc_remove_host(mmc);
2092         free_irq(mmc_slot(host).card_detect_irq, host);
2093 err_irq_cd:
2094         if (host->use_reg)
2095                 omap_hsmmc_reg_put(host);
2096 err_reg:
2097         if (host->pdata->cleanup)
2098                 host->pdata->cleanup(&pdev->dev);
2099 err_irq_cd_init:
2100         free_irq(host->irq, host);
2101 err_irq:
2102         if (host->tx_chan)
2103                 dma_release_channel(host->tx_chan);
2104         if (host->rx_chan)
2105                 dma_release_channel(host->rx_chan);
2106         pm_runtime_put_sync(host->dev);
2107         pm_runtime_disable(host->dev);
2108         clk_put(host->fclk);
2109         if (host->dbclk) {
2110                 clk_disable_unprepare(host->dbclk);
2111                 clk_put(host->dbclk);
2112         }
2113 err1:
2114         iounmap(host->base);
2115         mmc_free_host(mmc);
2116 err_alloc:
2117         omap_hsmmc_gpio_free(pdata);
2118 err:
2119         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2120         if (res)
2121                 release_mem_region(res->start, resource_size(res));
2122         return ret;
2123 }
2124 
2125 static int omap_hsmmc_remove(struct platform_device *pdev)
2126 {
2127         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2128         struct resource *res;
2129 
2130         pm_runtime_get_sync(host->dev);
2131         mmc_remove_host(host->mmc);
2132         if (host->use_reg)
2133                 omap_hsmmc_reg_put(host);
2134         if (host->pdata->cleanup)
2135                 host->pdata->cleanup(&pdev->dev);
2136         free_irq(host->irq, host);
2137         if (mmc_slot(host).card_detect_irq)
2138                 free_irq(mmc_slot(host).card_detect_irq, host);
2139 
2140         if (host->tx_chan)
2141                 dma_release_channel(host->tx_chan);
2142         if (host->rx_chan)
2143                 dma_release_channel(host->rx_chan);
2144 
2145         pm_runtime_put_sync(host->dev);
2146         pm_runtime_disable(host->dev);
2147         clk_put(host->fclk);
2148         if (host->dbclk) {
2149                 clk_disable_unprepare(host->dbclk);
2150                 clk_put(host->dbclk);
2151         }
2152 
2153         omap_hsmmc_gpio_free(host->pdata);
2154         iounmap(host->base);
2155         mmc_free_host(host->mmc);
2156 
2157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2158         if (res)
2159                 release_mem_region(res->start, resource_size(res));
2160 
2161         return 0;
2162 }
2163 
2164 #ifdef CONFIG_PM
2165 static int omap_hsmmc_prepare(struct device *dev)
2166 {
2167         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2168 
2169         if (host->pdata->suspend)
2170                 return host->pdata->suspend(dev, host->slot_id);
2171 
2172         return 0;
2173 }
2174 
2175 static void omap_hsmmc_complete(struct device *dev)
2176 {
2177         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2178 
2179         if (host->pdata->resume)
2180                 host->pdata->resume(dev, host->slot_id);
2181 
2182 }
2183 
2184 static int omap_hsmmc_suspend(struct device *dev)
2185 {
2186         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2187 
2188         if (!host)
2189                 return 0;
2190 
2191         pm_runtime_get_sync(host->dev);
2192 
2193         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2194                 omap_hsmmc_disable_irq(host);
2195                 OMAP_HSMMC_WRITE(host->base, HCTL,
2196                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2197         }
2198 
2199         if (host->dbclk)
2200                 clk_disable_unprepare(host->dbclk);
2201 
2202         pm_runtime_put_sync(host->dev);
2203         return 0;
2204 }
2205 
2206 /* Routine to resume the MMC device */
2207 static int omap_hsmmc_resume(struct device *dev)
2208 {
2209         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2210 
2211         if (!host)
2212                 return 0;
2213 
2214         pm_runtime_get_sync(host->dev);
2215 
2216         if (host->dbclk)
2217                 clk_prepare_enable(host->dbclk);
2218 
2219         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2220                 omap_hsmmc_conf_bus_power(host);
2221 
2222         omap_hsmmc_protect_card(host);
2223 
2224         pm_runtime_mark_last_busy(host->dev);
2225         pm_runtime_put_autosuspend(host->dev);
2226         return 0;
2227 }
2228 
2229 #else
2230 #define omap_hsmmc_prepare      NULL
2231 #define omap_hsmmc_complete     NULL
2232 #define omap_hsmmc_suspend      NULL
2233 #define omap_hsmmc_resume       NULL
2234 #endif
2235 
2236 static int omap_hsmmc_runtime_suspend(struct device *dev)
2237 {
2238         struct omap_hsmmc_host *host;
2239 
2240         host = platform_get_drvdata(to_platform_device(dev));
2241         omap_hsmmc_context_save(host);
2242         dev_dbg(dev, "disabled\n");
2243 
2244         return 0;
2245 }
2246 
2247 static int omap_hsmmc_runtime_resume(struct device *dev)
2248 {
2249         struct omap_hsmmc_host *host;
2250 
2251         host = platform_get_drvdata(to_platform_device(dev));
2252         omap_hsmmc_context_restore(host);
2253         dev_dbg(dev, "enabled\n");
2254 
2255         return 0;
2256 }
2257 
2258 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2259         .suspend        = omap_hsmmc_suspend,
2260         .resume         = omap_hsmmc_resume,
2261         .prepare        = omap_hsmmc_prepare,
2262         .complete       = omap_hsmmc_complete,
2263         .runtime_suspend = omap_hsmmc_runtime_suspend,
2264         .runtime_resume = omap_hsmmc_runtime_resume,
2265 };
2266 
2267 static struct platform_driver omap_hsmmc_driver = {
2268         .probe          = omap_hsmmc_probe,
2269         .remove         = omap_hsmmc_remove,
2270         .driver         = {
2271                 .name = DRIVER_NAME,
2272                 .owner = THIS_MODULE,
2273                 .pm = &omap_hsmmc_dev_pm_ops,
2274                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2275         },
2276 };
2277 
2278 module_platform_driver(omap_hsmmc_driver);
2279 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2280 MODULE_LICENSE("GPL");
2281 MODULE_ALIAS("platform:" DRIVER_NAME);
2282 MODULE_AUTHOR("Texas Instruments Inc");
2283 

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