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/seq_file.h>
  23#include <linux/interrupt.h>
  24#include <linux/delay.h>
  25#include <linux/dma-mapping.h>
  26#include <linux/platform_device.h>
 
  27#include <linux/timer.h>
  28#include <linux/clk.h>
  29#include <linux/of.h>
  30#include <linux/of_gpio.h>
  31#include <linux/of_device.h>
  32#include <linux/mmc/host.h>
  33#include <linux/mmc/core.h>
  34#include <linux/mmc/mmc.h>
  35#include <linux/io.h>
  36#include <linux/semaphore.h>
  37#include <linux/gpio.h>
  38#include <linux/regulator/consumer.h>
  39#include <linux/pm_runtime.h>
  40#include <plat/dma.h>
  41#include <mach/hardware.h>
  42#include <plat/board.h>
  43#include <plat/mmc.h>
  44#include <plat/cpu.h>
  45
  46/* OMAP HSMMC Host Controller Registers */
  47#define OMAP_HSMMC_SYSCONFIG	0x0010
  48#define OMAP_HSMMC_SYSSTATUS	0x0014
  49#define OMAP_HSMMC_CON		0x002C
  50#define OMAP_HSMMC_BLK		0x0104
  51#define OMAP_HSMMC_ARG		0x0108
  52#define OMAP_HSMMC_CMD		0x010C
  53#define OMAP_HSMMC_RSP10	0x0110
  54#define OMAP_HSMMC_RSP32	0x0114
  55#define OMAP_HSMMC_RSP54	0x0118
  56#define OMAP_HSMMC_RSP76	0x011C
  57#define OMAP_HSMMC_DATA		0x0120
  58#define OMAP_HSMMC_HCTL		0x0128
  59#define OMAP_HSMMC_SYSCTL	0x012C
  60#define OMAP_HSMMC_STAT		0x0130
  61#define OMAP_HSMMC_IE		0x0134
  62#define OMAP_HSMMC_ISE		0x0138
  63#define OMAP_HSMMC_CAPA		0x0140
  64
  65#define VS18			(1 << 26)
  66#define VS30			(1 << 25)
  67#define SDVS18			(0x5 << 9)
  68#define SDVS30			(0x6 << 9)
  69#define SDVS33			(0x7 << 9)
  70#define SDVS_MASK		0x00000E00
  71#define SDVSCLR			0xFFFFF1FF
  72#define SDVSDET			0x00000400
  73#define AUTOIDLE		0x1
  74#define SDBP			(1 << 8)
  75#define DTO			0xe
  76#define ICE			0x1
  77#define ICS			0x2
  78#define CEN			(1 << 2)
  79#define CLKD_MASK		0x0000FFC0
  80#define CLKD_SHIFT		6
  81#define DTO_MASK		0x000F0000
  82#define DTO_SHIFT		16
  83#define INT_EN_MASK		0x307F0033
  84#define BWR_ENABLE		(1 << 4)
  85#define BRR_ENABLE		(1 << 5)
  86#define DTO_ENABLE		(1 << 20)
  87#define INIT_STREAM		(1 << 1)
  88#define DP_SELECT		(1 << 21)
  89#define DDIR			(1 << 4)
  90#define DMA_EN			0x1
  91#define MSBS			(1 << 5)
  92#define BCE			(1 << 1)
  93#define FOUR_BIT		(1 << 1)
  94#define DDR			(1 << 19)
  95#define DW8			(1 << 5)
  96#define CC			0x1
  97#define TC			0x02
  98#define OD			0x1
  99#define ERR			(1 << 15)
 100#define CMD_TIMEOUT		(1 << 16)
 101#define DATA_TIMEOUT		(1 << 20)
 102#define CMD_CRC			(1 << 17)
 103#define DATA_CRC		(1 << 21)
 104#define CARD_ERR		(1 << 28)
 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#define RESETDONE		(1 << 0)
 112
 
 
 
 
 
 
 
 
 
 
 
 113#define MMC_AUTOSUSPEND_DELAY	100
 114#define MMC_TIMEOUT_MS		20
 
 115#define OMAP_MMC_MIN_CLOCK	400000
 116#define OMAP_MMC_MAX_CLOCK	52000000
 117#define DRIVER_NAME		"omap_hsmmc"
 118
 119/*
 120 * One controller can have multiple slots, like on some omap boards using
 121 * omap.c controller driver. Luckily this is not currently done on any known
 122 * omap_hsmmc.c device.
 123 */
 124#define mmc_slot(host)		(host->pdata->slots[host->slot_id])
 125
 126/*
 127 * MMC Host controller read/write API's
 128 */
 129#define OMAP_HSMMC_READ(base, reg)	\
 130	__raw_readl((base) + OMAP_HSMMC_##reg)
 131
 132#define OMAP_HSMMC_WRITE(base, reg, val) \
 133	__raw_writel((val), (base) + OMAP_HSMMC_##reg)
 134
 135struct omap_hsmmc_next {
 136	unsigned int	dma_len;
 137	s32		cookie;
 138};
 139
 140struct omap_hsmmc_host {
 141	struct	device		*dev;
 142	struct	mmc_host	*mmc;
 143	struct	mmc_request	*mrq;
 144	struct	mmc_command	*cmd;
 145	struct	mmc_data	*data;
 146	struct	clk		*fclk;
 147	struct	clk		*dbclk;
 148	/*
 149	 * vcc == configured supply
 150	 * vcc_aux == optional
 151	 *   -	MMC1, supply for DAT4..DAT7
 152	 *   -	MMC2/MMC2, external level shifter voltage supply, for
 153	 *	chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
 154	 */
 155	struct	regulator	*vcc;
 156	struct	regulator	*vcc_aux;
 
 157	void	__iomem		*base;
 158	resource_size_t		mapbase;
 159	spinlock_t		irq_lock; /* Prevent races with irq handler */
 
 160	unsigned int		dma_len;
 161	unsigned int		dma_sg_idx;
 162	unsigned char		bus_mode;
 163	unsigned char		power_mode;
 164	u32			*buffer;
 165	u32			bytesleft;
 166	int			suspended;
 167	int			irq;
 168	int			use_dma, dma_ch;
 169	int			dma_line_tx, dma_line_rx;
 170	int			slot_id;
 
 171	int			response_busy;
 172	int			context_loss;
 
 173	int			vdd;
 174	int			protect_card;
 175	int			reqs_blocked;
 176	int			use_reg;
 177	int			req_in_progress;
 178	struct omap_hsmmc_next	next_data;
 179
 180	struct	omap_mmc_platform_data	*pdata;
 181};
 182
 183static int omap_hsmmc_card_detect(struct device *dev, int slot)
 184{
 185	struct omap_mmc_platform_data *mmc = dev->platform_data;
 186
 187	/* NOTE: assumes card detect signal is active-low */
 188	return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 189}
 190
 191static int omap_hsmmc_get_wp(struct device *dev, int slot)
 192{
 193	struct omap_mmc_platform_data *mmc = dev->platform_data;
 194
 195	/* NOTE: assumes write protect signal is active-high */
 196	return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
 197}
 198
 199static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
 200{
 201	struct omap_mmc_platform_data *mmc = dev->platform_data;
 202
 203	/* NOTE: assumes card detect signal is active-low */
 204	return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 205}
 206
 207#ifdef CONFIG_PM
 208
 209static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
 210{
 211	struct omap_mmc_platform_data *mmc = dev->platform_data;
 212
 213	disable_irq(mmc->slots[0].card_detect_irq);
 214	return 0;
 215}
 216
 217static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
 218{
 219	struct omap_mmc_platform_data *mmc = dev->platform_data;
 220
 221	enable_irq(mmc->slots[0].card_detect_irq);
 222	return 0;
 223}
 224
 225#else
 226
 227#define omap_hsmmc_suspend_cdirq	NULL
 228#define omap_hsmmc_resume_cdirq		NULL
 229
 230#endif
 231
 232#ifdef CONFIG_REGULATOR
 233
 234static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 235				   int vdd)
 236{
 237	struct omap_hsmmc_host *host =
 238		platform_get_drvdata(to_platform_device(dev));
 239	int ret = 0;
 240
 241	/*
 242	 * If we don't see a Vcc regulator, assume it's a fixed
 243	 * voltage always-on regulator.
 244	 */
 245	if (!host->vcc)
 246		return 0;
 247	/*
 248	 * With DT, never turn OFF the regulator. This is because
 249	 * the pbias cell programming support is still missing when
 250	 * booting with Device tree
 251	 */
 252	if (dev->of_node && !vdd)
 253		return 0;
 254
 255	if (mmc_slot(host).before_set_reg)
 256		mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 257
 258	/*
 259	 * Assume Vcc regulator is used only to power the card ... OMAP
 260	 * VDDS is used to power the pins, optionally with a transceiver to
 261	 * support cards using voltages other than VDDS (1.8V nominal).  When a
 262	 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 263	 *
 264	 * In some cases this regulator won't support enable/disable;
 265	 * e.g. it's a fixed rail for a WLAN chip.
 266	 *
 267	 * In other cases vcc_aux switches interface power.  Example, for
 268	 * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 269	 * chips/cards need an interface voltage rail too.
 270	 */
 271	if (power_on) {
 272		ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 273		/* Enable interface voltage rail, if needed */
 274		if (ret == 0 && host->vcc_aux) {
 275			ret = regulator_enable(host->vcc_aux);
 276			if (ret < 0)
 277				ret = mmc_regulator_set_ocr(host->mmc,
 278							host->vcc, 0);
 279		}
 280	} else {
 281		/* Shut down the rail */
 282		if (host->vcc_aux)
 283			ret = regulator_disable(host->vcc_aux);
 284		if (!ret) {
 285			/* Then proceed to shut down the local regulator */
 286			ret = mmc_regulator_set_ocr(host->mmc,
 287						host->vcc, 0);
 288		}
 289	}
 290
 291	if (mmc_slot(host).after_set_reg)
 292		mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 293
 294	return ret;
 295}
 296
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 297static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 298{
 299	struct regulator *reg;
 
 300	int ocr_value = 0;
 301
 302	mmc_slot(host).set_power = omap_hsmmc_set_power;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 303
 304	reg = regulator_get(host->dev, "vmmc");
 305	if (IS_ERR(reg)) {
 306		dev_dbg(host->dev, "vmmc regulator missing\n");
 
 
 
 
 
 
 
 
 
 307	} else {
 308		host->vcc = reg;
 309		ocr_value = mmc_regulator_get_ocrmask(reg);
 310		if (!mmc_slot(host).ocr_mask) {
 311			mmc_slot(host).ocr_mask = ocr_value;
 312		} else {
 313			if (!(mmc_slot(host).ocr_mask & ocr_value)) {
 314				dev_err(host->dev, "ocrmask %x is not supported\n",
 315					mmc_slot(host).ocr_mask);
 316				mmc_slot(host).ocr_mask = 0;
 317				return -EINVAL;
 318			}
 319		}
 320
 321		/* Allow an aux regulator */
 322		reg = regulator_get(host->dev, "vmmc_aux");
 323		host->vcc_aux = IS_ERR(reg) ? NULL : reg;
 324
 325		/* For eMMC do not power off when not in sleep state */
 326		if (mmc_slot(host).no_regulator_off_init)
 327			return 0;
 328		/*
 329		* UGLY HACK:  workaround regulator framework bugs.
 330		* When the bootloader leaves a supply active, it's
 331		* initialized with zero usecount ... and we can't
 332		* disable it without first enabling it.  Until the
 333		* framework is fixed, we need a workaround like this
 334		* (which is safe for MMC, but not in general).
 335		*/
 336		if (regulator_is_enabled(host->vcc) > 0 ||
 337		    (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
 338			int vdd = ffs(mmc_slot(host).ocr_mask) - 1;
 339
 340			mmc_slot(host).set_power(host->dev, host->slot_id,
 341						 1, vdd);
 342			mmc_slot(host).set_power(host->dev, host->slot_id,
 343						 0, 0);
 
 344		}
 345	}
 346
 347	return 0;
 
 
 
 
 
 348}
 349
 350static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 351{
 352	regulator_put(host->vcc);
 353	regulator_put(host->vcc_aux);
 354	mmc_slot(host).set_power = NULL;
 
 355}
 356
 357static inline int omap_hsmmc_have_reg(void)
 358{
 359	return 1;
 360}
 361
 362#else
 363
 364static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 365{
 366	return -EINVAL;
 367}
 368
 369static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 370{
 371}
 372
 373static inline int omap_hsmmc_have_reg(void)
 374{
 375	return 0;
 376}
 377
 378#endif
 379
 380static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
 381{
 382	int ret;
 383
 384	if (gpio_is_valid(pdata->slots[0].switch_pin)) {
 385		if (pdata->slots[0].cover)
 386			pdata->slots[0].get_cover_state =
 387					omap_hsmmc_get_cover_state;
 388		else
 389			pdata->slots[0].card_detect = omap_hsmmc_card_detect;
 390		pdata->slots[0].card_detect_irq =
 391				gpio_to_irq(pdata->slots[0].switch_pin);
 392		ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
 393		if (ret)
 394			return ret;
 395		ret = gpio_direction_input(pdata->slots[0].switch_pin);
 396		if (ret)
 397			goto err_free_sp;
 398	} else
 399		pdata->slots[0].switch_pin = -EINVAL;
 400
 401	if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
 402		pdata->slots[0].get_ro = omap_hsmmc_get_wp;
 403		ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
 404		if (ret)
 405			goto err_free_cd;
 406		ret = gpio_direction_input(pdata->slots[0].gpio_wp);
 407		if (ret)
 408			goto err_free_wp;
 409	} else
 410		pdata->slots[0].gpio_wp = -EINVAL;
 411
 412	return 0;
 413
 414err_free_wp:
 415	gpio_free(pdata->slots[0].gpio_wp);
 416err_free_cd:
 417	if (gpio_is_valid(pdata->slots[0].switch_pin))
 418err_free_sp:
 419		gpio_free(pdata->slots[0].switch_pin);
 420	return ret;
 421}
 422
 423static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 424{
 425	if (gpio_is_valid(pdata->slots[0].gpio_wp))
 426		gpio_free(pdata->slots[0].gpio_wp);
 427	if (gpio_is_valid(pdata->slots[0].switch_pin))
 428		gpio_free(pdata->slots[0].switch_pin);
 429}
 430
 431/*
 432 * Start clock to the card
 433 */
 434static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
 435{
 436	OMAP_HSMMC_WRITE(host->base, SYSCTL,
 437		OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 438}
 439
 440/*
 441 * Stop clock to the card
 442 */
 443static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 444{
 445	OMAP_HSMMC_WRITE(host->base, SYSCTL,
 446		OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 447	if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 448		dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
 449}
 450
 451static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 452				  struct mmc_command *cmd)
 453{
 454	unsigned int irq_mask;
 455
 456	if (host->use_dma)
 457		irq_mask = INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE);
 458	else
 459		irq_mask = INT_EN_MASK;
 460
 461	/* Disable timeout for erases */
 462	if (cmd->opcode == MMC_ERASE)
 463		irq_mask &= ~DTO_ENABLE;
 464
 465	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 466	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 467	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 468}
 469
 470static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 471{
 472	OMAP_HSMMC_WRITE(host->base, ISE, 0);
 473	OMAP_HSMMC_WRITE(host->base, IE, 0);
 474	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 475}
 476
 477/* Calculate divisor for the given clock frequency */
 478static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
 479{
 480	u16 dsor = 0;
 481
 482	if (ios->clock) {
 483		dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
 484		if (dsor > 250)
 485			dsor = 250;
 486	}
 487
 488	return dsor;
 489}
 490
 491static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
 492{
 493	struct mmc_ios *ios = &host->mmc->ios;
 494	unsigned long regval;
 495	unsigned long timeout;
 496
 497	dev_dbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
 498
 499	omap_hsmmc_stop_clock(host);
 500
 501	regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 502	regval = regval & ~(CLKD_MASK | DTO_MASK);
 503	regval = regval | (calc_divisor(host, ios) << 6) | (DTO << 16);
 504	OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 505	OMAP_HSMMC_WRITE(host->base, SYSCTL,
 506		OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 507
 508	/* Wait till the ICS bit is set */
 509	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 510	while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
 511		&& time_before(jiffies, timeout))
 512		cpu_relax();
 513
 514	omap_hsmmc_start_clock(host);
 515}
 516
 517static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
 518{
 519	struct mmc_ios *ios = &host->mmc->ios;
 520	u32 con;
 521
 522	con = OMAP_HSMMC_READ(host->base, CON);
 523	if (ios->timing == MMC_TIMING_UHS_DDR50)
 524		con |= DDR;	/* configure in DDR mode */
 525	else
 526		con &= ~DDR;
 527	switch (ios->bus_width) {
 528	case MMC_BUS_WIDTH_8:
 529		OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 530		break;
 531	case MMC_BUS_WIDTH_4:
 532		OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 533		OMAP_HSMMC_WRITE(host->base, HCTL,
 534			OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 535		break;
 536	case MMC_BUS_WIDTH_1:
 537		OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 538		OMAP_HSMMC_WRITE(host->base, HCTL,
 539			OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 540		break;
 541	}
 542}
 543
 544static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
 545{
 546	struct mmc_ios *ios = &host->mmc->ios;
 547	u32 con;
 548
 549	con = OMAP_HSMMC_READ(host->base, CON);
 550	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 551		OMAP_HSMMC_WRITE(host->base, CON, con | OD);
 552	else
 553		OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
 554}
 555
 556#ifdef CONFIG_PM
 557
 558/*
 559 * Restore the MMC host context, if it was lost as result of a
 560 * power state change.
 561 */
 562static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 563{
 564	struct mmc_ios *ios = &host->mmc->ios;
 565	struct omap_mmc_platform_data *pdata = host->pdata;
 566	int context_loss = 0;
 567	u32 hctl, capa;
 568	unsigned long timeout;
 569
 570	if (pdata->get_context_loss_count) {
 571		context_loss = pdata->get_context_loss_count(host->dev);
 572		if (context_loss < 0)
 573			return 1;
 574	}
 575
 576	dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
 577		context_loss == host->context_loss ? "not " : "");
 578	if (host->context_loss == context_loss)
 579		return 1;
 580
 581	/* Wait for hardware reset */
 582	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 583	while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 584		&& time_before(jiffies, timeout))
 585		;
 586
 587	/* Do software reset */
 588	OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
 589	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 590	while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 591		&& time_before(jiffies, timeout))
 592		;
 593
 594	OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
 595			OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
 596
 597	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
 598		if (host->power_mode != MMC_POWER_OFF &&
 599		    (1 << ios->vdd) <= MMC_VDD_23_24)
 600			hctl = SDVS18;
 601		else
 602			hctl = SDVS30;
 603		capa = VS30 | VS18;
 604	} else {
 605		hctl = SDVS18;
 606		capa = VS18;
 607	}
 608
 609	OMAP_HSMMC_WRITE(host->base, HCTL,
 610			OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 611
 612	OMAP_HSMMC_WRITE(host->base, CAPA,
 613			OMAP_HSMMC_READ(host->base, CAPA) | capa);
 614
 615	OMAP_HSMMC_WRITE(host->base, HCTL,
 616			OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 617
 618	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 619	while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
 620		&& time_before(jiffies, timeout))
 621		;
 622
 623	omap_hsmmc_disable_irq(host);
 624
 625	/* Do not initialize card-specific things if the power is off */
 626	if (host->power_mode == MMC_POWER_OFF)
 627		goto out;
 628
 629	omap_hsmmc_set_bus_width(host);
 630
 631	omap_hsmmc_set_clock(host);
 632
 633	omap_hsmmc_set_bus_mode(host);
 634
 635out:
 636	host->context_loss = context_loss;
 637
 638	dev_dbg(mmc_dev(host->mmc), "context is restored\n");
 639	return 0;
 640}
 641
 642/*
 643 * Save the MMC host context (store the number of power state changes so far).
 644 */
 645static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 646{
 647	struct omap_mmc_platform_data *pdata = host->pdata;
 648	int context_loss;
 649
 650	if (pdata->get_context_loss_count) {
 651		context_loss = pdata->get_context_loss_count(host->dev);
 652		if (context_loss < 0)
 653			return;
 654		host->context_loss = context_loss;
 655	}
 656}
 657
 658#else
 659
 660static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 661{
 662	return 0;
 663}
 664
 665static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 666{
 667}
 668
 669#endif
 670
 671/*
 672 * Send init stream sequence to card
 673 * before sending IDLE command
 674 */
 675static void send_init_stream(struct omap_hsmmc_host *host)
 676{
 677	int reg = 0;
 678	unsigned long timeout;
 679
 680	if (host->protect_card)
 681		return;
 682
 683	disable_irq(host->irq);
 684
 685	OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 686	OMAP_HSMMC_WRITE(host->base, CON,
 687		OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 688	OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 689
 690	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 691	while ((reg != CC) && time_before(jiffies, timeout))
 692		reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
 693
 694	OMAP_HSMMC_WRITE(host->base, CON,
 695		OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 696
 697	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 698	OMAP_HSMMC_READ(host->base, STAT);
 699
 700	enable_irq(host->irq);
 701}
 702
 703static inline
 704int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
 705{
 706	int r = 1;
 707
 708	if (mmc_slot(host).get_cover_state)
 709		r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
 710	return r;
 711}
 712
 713static ssize_t
 714omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
 715			   char *buf)
 716{
 717	struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 718	struct omap_hsmmc_host *host = mmc_priv(mmc);
 719
 720	return sprintf(buf, "%s\n",
 721			omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
 722}
 723
 724static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
 725
 726static ssize_t
 727omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
 728			char *buf)
 729{
 730	struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 731	struct omap_hsmmc_host *host = mmc_priv(mmc);
 732
 733	return sprintf(buf, "%s\n", mmc_slot(host).name);
 734}
 735
 736static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
 737
 738/*
 739 * Configure the response type and send the cmd.
 740 */
 741static void
 742omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
 743	struct mmc_data *data)
 744{
 745	int cmdreg = 0, resptype = 0, cmdtype = 0;
 746
 747	dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 748		mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 749	host->cmd = cmd;
 750
 751	omap_hsmmc_enable_irq(host, cmd);
 752
 753	host->response_busy = 0;
 754	if (cmd->flags & MMC_RSP_PRESENT) {
 755		if (cmd->flags & MMC_RSP_136)
 756			resptype = 1;
 757		else if (cmd->flags & MMC_RSP_BUSY) {
 758			resptype = 3;
 759			host->response_busy = 1;
 760		} else
 761			resptype = 2;
 762	}
 763
 764	/*
 765	 * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 766	 * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 767	 * a val of 0x3, rest 0x0.
 768	 */
 769	if (cmd == host->mrq->stop)
 770		cmdtype = 0x3;
 771
 772	cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 773
 774	if (data) {
 775		cmdreg |= DP_SELECT | MSBS | BCE;
 776		if (data->flags & MMC_DATA_READ)
 777			cmdreg |= DDIR;
 778		else
 779			cmdreg &= ~(DDIR);
 780	}
 781
 782	if (host->use_dma)
 783		cmdreg |= DMA_EN;
 784
 785	host->req_in_progress = 1;
 786
 787	OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 788	OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 789}
 790
 791static int
 792omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
 793{
 794	if (data->flags & MMC_DATA_WRITE)
 795		return DMA_TO_DEVICE;
 796	else
 797		return DMA_FROM_DEVICE;
 798}
 799
 800static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
 801{
 802	int dma_ch;
 803	unsigned long flags;
 804
 805	spin_lock_irqsave(&host->irq_lock, flags);
 806	host->req_in_progress = 0;
 807	dma_ch = host->dma_ch;
 808	spin_unlock_irqrestore(&host->irq_lock, flags);
 809
 810	omap_hsmmc_disable_irq(host);
 811	/* Do not complete the request if DMA is still in progress */
 812	if (mrq->data && host->use_dma && dma_ch != -1)
 813		return;
 814	host->mrq = NULL;
 815	mmc_request_done(host->mmc, mrq);
 816}
 817
 818/*
 819 * Notify the transfer complete to MMC core
 820 */
 821static void
 822omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
 823{
 824	if (!data) {
 825		struct mmc_request *mrq = host->mrq;
 826
 827		/* TC before CC from CMD6 - don't know why, but it happens */
 828		if (host->cmd && host->cmd->opcode == 6 &&
 829		    host->response_busy) {
 830			host->response_busy = 0;
 831			return;
 832		}
 833
 834		omap_hsmmc_request_done(host, mrq);
 835		return;
 836	}
 837
 838	host->data = NULL;
 839
 840	if (!data->error)
 841		data->bytes_xfered += data->blocks * (data->blksz);
 842	else
 843		data->bytes_xfered = 0;
 844
 845	if (!data->stop) {
 846		omap_hsmmc_request_done(host, data->mrq);
 847		return;
 848	}
 849	omap_hsmmc_start_command(host, data->stop, NULL);
 850}
 851
 852/*
 853 * Notify the core about command completion
 854 */
 855static void
 856omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
 857{
 858	host->cmd = NULL;
 859
 860	if (cmd->flags & MMC_RSP_PRESENT) {
 861		if (cmd->flags & MMC_RSP_136) {
 862			/* response type 2 */
 863			cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 864			cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 865			cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 866			cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 867		} else {
 868			/* response types 1, 1b, 3, 4, 5, 6 */
 869			cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 870		}
 871	}
 872	if ((host->data == NULL && !host->response_busy) || cmd->error)
 873		omap_hsmmc_request_done(host, cmd->mrq);
 874}
 875
 876/*
 877 * DMA clean up for command errors
 878 */
 879static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
 880{
 881	int dma_ch;
 882	unsigned long flags;
 883
 884	host->data->error = errno;
 885
 886	spin_lock_irqsave(&host->irq_lock, flags);
 887	dma_ch = host->dma_ch;
 888	host->dma_ch = -1;
 889	spin_unlock_irqrestore(&host->irq_lock, flags);
 890
 891	if (host->use_dma && dma_ch != -1) {
 892		dma_unmap_sg(mmc_dev(host->mmc), host->data->sg,
 893			host->data->sg_len,
 894			omap_hsmmc_get_dma_dir(host, host->data));
 895		omap_free_dma(dma_ch);
 896		host->data->host_cookie = 0;
 897	}
 898	host->data = NULL;
 899}
 900
 901/*
 902 * Readable error output
 903 */
 904#ifdef CONFIG_MMC_DEBUG
 905static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
 906{
 907	/* --- means reserved bit without definition at documentation */
 908	static const char *omap_hsmmc_status_bits[] = {
 909		"CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
 910		"CIRQ",	"OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
 911		"CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
 912		"ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
 913	};
 914	char res[256];
 915	char *buf = res;
 916	int len, i;
 917
 918	len = sprintf(buf, "MMC IRQ 0x%x :", status);
 919	buf += len;
 920
 921	for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
 922		if (status & (1 << i)) {
 923			len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
 924			buf += len;
 925		}
 926
 927	dev_dbg(mmc_dev(host->mmc), "%s\n", res);
 928}
 929#else
 930static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
 931					     u32 status)
 932{
 933}
 934#endif  /* CONFIG_MMC_DEBUG */
 935
 936/*
 937 * MMC controller internal state machines reset
 938 *
 939 * Used to reset command or data internal state machines, using respectively
 940 *  SRC or SRD bit of SYSCTL register
 941 * Can be called from interrupt context
 942 */
 943static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
 944						   unsigned long bit)
 945{
 946	unsigned long i = 0;
 947	unsigned long limit = (loops_per_jiffy *
 948				msecs_to_jiffies(MMC_TIMEOUT_MS));
 949
 950	OMAP_HSMMC_WRITE(host->base, SYSCTL,
 951			 OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
 952
 953	/*
 954	 * OMAP4 ES2 and greater has an updated reset logic.
 955	 * Monitor a 0->1 transition first
 956	 */
 957	if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
 958		while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
 959					&& (i++ < limit))
 960			cpu_relax();
 961	}
 962	i = 0;
 963
 964	while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
 965		(i++ < limit))
 966		cpu_relax();
 967
 968	if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
 969		dev_err(mmc_dev(host->mmc),
 970			"Timeout waiting on controller reset in %s\n",
 971			__func__);
 972}
 973
 974static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
 975{
 976	struct mmc_data *data;
 977	int end_cmd = 0, end_trans = 0;
 978
 979	if (!host->req_in_progress) {
 980		do {
 981			OMAP_HSMMC_WRITE(host->base, STAT, status);
 982			/* Flush posted write */
 983			status = OMAP_HSMMC_READ(host->base, STAT);
 984		} while (status & INT_EN_MASK);
 985		return;
 986	}
 987
 988	data = host->data;
 989	dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
 990
 991	if (status & ERR) {
 992		omap_hsmmc_dbg_report_irq(host, status);
 993		if ((status & CMD_TIMEOUT) ||
 994			(status & CMD_CRC)) {
 995			if (host->cmd) {
 996				if (status & CMD_TIMEOUT) {
 997					omap_hsmmc_reset_controller_fsm(host,
 998									SRC);
 999					host->cmd->error = -ETIMEDOUT;
1000				} else {
1001					host->cmd->error = -EILSEQ;
1002				}
1003				end_cmd = 1;
1004			}
1005			if (host->data || host->response_busy) {
1006				if (host->data)
1007					omap_hsmmc_dma_cleanup(host,
1008								-ETIMEDOUT);
1009				host->response_busy = 0;
1010				omap_hsmmc_reset_controller_fsm(host, SRD);
1011			}
1012		}
1013		if ((status & DATA_TIMEOUT) ||
1014			(status & DATA_CRC)) {
1015			if (host->data || host->response_busy) {
1016				int err = (status & DATA_TIMEOUT) ?
1017						-ETIMEDOUT : -EILSEQ;
1018
1019				if (host->data)
1020					omap_hsmmc_dma_cleanup(host, err);
1021				else
1022					host->mrq->cmd->error = err;
1023				host->response_busy = 0;
1024				omap_hsmmc_reset_controller_fsm(host, SRD);
1025				end_trans = 1;
1026			}
1027		}
1028		if (status & CARD_ERR) {
1029			dev_dbg(mmc_dev(host->mmc),
1030				"Ignoring card err CMD%d\n", host->cmd->opcode);
1031			if (host->cmd)
1032				end_cmd = 1;
1033			if (host->data)
1034				end_trans = 1;
1035		}
1036	}
1037
1038	OMAP_HSMMC_WRITE(host->base, STAT, status);
1039
1040	if (end_cmd || ((status & CC) && host->cmd))
1041		omap_hsmmc_cmd_done(host, host->cmd);
1042	if ((end_trans || (status & TC)) && host->mrq)
1043		omap_hsmmc_xfer_done(host, data);
1044}
1045
1046/*
1047 * MMC controller IRQ handler
1048 */
1049static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1050{
1051	struct omap_hsmmc_host *host = dev_id;
1052	int status;
1053
1054	status = OMAP_HSMMC_READ(host->base, STAT);
1055	do {
1056		omap_hsmmc_do_irq(host, status);
1057		/* Flush posted write */
1058		status = OMAP_HSMMC_READ(host->base, STAT);
1059	} while (status & INT_EN_MASK);
1060
1061	return IRQ_HANDLED;
1062}
1063
1064static void set_sd_bus_power(struct omap_hsmmc_host *host)
1065{
1066	unsigned long i;
1067
1068	OMAP_HSMMC_WRITE(host->base, HCTL,
1069			 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1070	for (i = 0; i < loops_per_jiffy; i++) {
1071		if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1072			break;
1073		cpu_relax();
1074	}
1075}
1076
1077/*
1078 * Switch MMC interface voltage ... only relevant for MMC1.
1079 *
1080 * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1081 * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1082 * Some chips, like eMMC ones, use internal transceivers.
1083 */
1084static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1085{
1086	u32 reg_val = 0;
1087	int ret;
1088
1089	/* Disable the clocks */
1090	pm_runtime_put_sync(host->dev);
1091	if (host->dbclk)
1092		clk_disable(host->dbclk);
1093
1094	/* Turn the power off */
1095	ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1096
1097	/* Turn the power ON with given VDD 1.8 or 3.0v */
1098	if (!ret)
1099		ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1100					       vdd);
1101	pm_runtime_get_sync(host->dev);
1102	if (host->dbclk)
1103		clk_enable(host->dbclk);
1104
1105	if (ret != 0)
1106		goto err;
1107
1108	OMAP_HSMMC_WRITE(host->base, HCTL,
1109		OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1110	reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1111
1112	/*
1113	 * If a MMC dual voltage card is detected, the set_ios fn calls
1114	 * this fn with VDD bit set for 1.8V. Upon card removal from the
1115	 * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1116	 *
1117	 * Cope with a bit of slop in the range ... per data sheets:
1118	 *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1119	 *    but recommended values are 1.71V to 1.89V
1120	 *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1121	 *    but recommended values are 2.7V to 3.3V
1122	 *
1123	 * Board setup code shouldn't permit anything very out-of-range.
1124	 * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1125	 * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1126	 */
1127	if ((1 << vdd) <= MMC_VDD_23_24)
1128		reg_val |= SDVS18;
1129	else
1130		reg_val |= SDVS30;
1131
1132	OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1133	set_sd_bus_power(host);
1134
1135	return 0;
1136err:
1137	dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1138	return ret;
1139}
1140
1141/* Protect the card while the cover is open */
1142static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1143{
1144	if (!mmc_slot(host).get_cover_state)
1145		return;
1146
1147	host->reqs_blocked = 0;
1148	if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1149		if (host->protect_card) {
1150			dev_info(host->dev, "%s: cover is closed, "
1151					 "card is now accessible\n",
1152					 mmc_hostname(host->mmc));
1153			host->protect_card = 0;
1154		}
1155	} else {
1156		if (!host->protect_card) {
1157			dev_info(host->dev, "%s: cover is open, "
1158					 "card is now inaccessible\n",
1159					 mmc_hostname(host->mmc));
1160			host->protect_card = 1;
1161		}
1162	}
1163}
1164
1165/*
1166 * irq handler to notify the core about card insertion/removal
1167 */
1168static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
1169{
1170	struct omap_hsmmc_host *host = dev_id;
 
1171	struct omap_mmc_slot_data *slot = &mmc_slot(host);
1172	int carddetect;
1173
1174	if (host->suspended)
1175		return IRQ_HANDLED;
1176
1177	sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1178
1179	if (slot->card_detect)
1180		carddetect = slot->card_detect(host->dev, host->slot_id);
1181	else {
1182		omap_hsmmc_protect_card(host);
1183		carddetect = -ENOSYS;
1184	}
1185
1186	if (carddetect)
1187		mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1188	else
1189		mmc_detect_change(host->mmc, (HZ * 50) / 1000);
 
 
 
 
 
 
 
 
 
 
 
 
 
1190	return IRQ_HANDLED;
1191}
1192
1193static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
1194				     struct mmc_data *data)
1195{
1196	int sync_dev;
1197
1198	if (data->flags & MMC_DATA_WRITE)
1199		sync_dev = host->dma_line_tx;
1200	else
1201		sync_dev = host->dma_line_rx;
1202	return sync_dev;
1203}
1204
1205static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
1206				       struct mmc_data *data,
1207				       struct scatterlist *sgl)
1208{
1209	int blksz, nblk, dma_ch;
1210
1211	dma_ch = host->dma_ch;
1212	if (data->flags & MMC_DATA_WRITE) {
1213		omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1214			(host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1215		omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1216			sg_dma_address(sgl), 0, 0);
1217	} else {
1218		omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1219			(host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1220		omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1221			sg_dma_address(sgl), 0, 0);
1222	}
1223
1224	blksz = host->data->blksz;
1225	nblk = sg_dma_len(sgl) / blksz;
1226
1227	omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
1228			blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
1229			omap_hsmmc_get_dma_sync_dev(host, data),
1230			!(data->flags & MMC_DATA_WRITE));
1231
1232	omap_start_dma(dma_ch);
1233}
1234
1235/*
1236 * DMA call back function
1237 */
1238static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data)
1239{
1240	struct omap_hsmmc_host *host = cb_data;
1241	struct mmc_data *data;
1242	int dma_ch, req_in_progress;
1243	unsigned long flags;
1244
1245	if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
1246		dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n",
1247			ch_status);
1248		return;
1249	}
1250
1251	spin_lock_irqsave(&host->irq_lock, flags);
1252	if (host->dma_ch < 0) {
1253		spin_unlock_irqrestore(&host->irq_lock, flags);
1254		return;
1255	}
1256
1257	data = host->mrq->data;
1258	host->dma_sg_idx++;
1259	if (host->dma_sg_idx < host->dma_len) {
1260		/* Fire up the next transfer. */
1261		omap_hsmmc_config_dma_params(host, data,
1262					   data->sg + host->dma_sg_idx);
1263		spin_unlock_irqrestore(&host->irq_lock, flags);
1264		return;
1265	}
1266
1267	if (!data->host_cookie)
1268		dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1269			     omap_hsmmc_get_dma_dir(host, data));
1270
1271	req_in_progress = host->req_in_progress;
1272	dma_ch = host->dma_ch;
1273	host->dma_ch = -1;
1274	spin_unlock_irqrestore(&host->irq_lock, flags);
1275
1276	omap_free_dma(dma_ch);
1277
1278	/* If DMA has finished after TC, complete the request */
1279	if (!req_in_progress) {
1280		struct mmc_request *mrq = host->mrq;
1281
1282		host->mrq = NULL;
1283		mmc_request_done(host->mmc, mrq);
1284	}
1285}
1286
1287static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1288				       struct mmc_data *data,
1289				       struct omap_hsmmc_next *next)
1290{
1291	int dma_len;
1292
1293	if (!next && data->host_cookie &&
1294	    data->host_cookie != host->next_data.cookie) {
1295		dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1296		       " host->next_data.cookie %d\n",
1297		       __func__, data->host_cookie, host->next_data.cookie);
1298		data->host_cookie = 0;
1299	}
1300
1301	/* Check if next job is already prepared */
1302	if (next ||
1303	    (!next && data->host_cookie != host->next_data.cookie)) {
1304		dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1305				     data->sg_len,
1306				     omap_hsmmc_get_dma_dir(host, data));
1307
1308	} else {
1309		dma_len = host->next_data.dma_len;
1310		host->next_data.dma_len = 0;
1311	}
1312
1313
1314	if (dma_len == 0)
1315		return -EINVAL;
1316
1317	if (next) {
1318		next->dma_len = dma_len;
1319		data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1320	} else
1321		host->dma_len = dma_len;
1322
1323	return 0;
1324}
1325
1326/*
1327 * Routine to configure and start DMA for the MMC card
1328 */
1329static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1330					struct mmc_request *req)
1331{
1332	int dma_ch = 0, ret = 0, i;
1333	struct mmc_data *data = req->data;
1334
1335	/* Sanity check: all the SG entries must be aligned by block size. */
1336	for (i = 0; i < data->sg_len; i++) {
1337		struct scatterlist *sgl;
1338
1339		sgl = data->sg + i;
1340		if (sgl->length % data->blksz)
1341			return -EINVAL;
1342	}
1343	if ((data->blksz % 4) != 0)
1344		/* REVISIT: The MMC buffer increments only when MSB is written.
1345		 * Return error for blksz which is non multiple of four.
1346		 */
1347		return -EINVAL;
1348
1349	BUG_ON(host->dma_ch != -1);
1350
1351	ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
1352			       "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
1353	if (ret != 0) {
1354		dev_err(mmc_dev(host->mmc),
1355			"%s: omap_request_dma() failed with %d\n",
1356			mmc_hostname(host->mmc), ret);
1357		return ret;
1358	}
1359	ret = omap_hsmmc_pre_dma_transfer(host, data, NULL);
1360	if (ret)
1361		return ret;
1362
1363	host->dma_ch = dma_ch;
1364	host->dma_sg_idx = 0;
1365
1366	omap_hsmmc_config_dma_params(host, data, data->sg);
1367
1368	return 0;
1369}
1370
1371static void set_data_timeout(struct omap_hsmmc_host *host,
1372			     unsigned int timeout_ns,
1373			     unsigned int timeout_clks)
1374{
1375	unsigned int timeout, cycle_ns;
1376	uint32_t reg, clkd, dto = 0;
1377
1378	reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1379	clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1380	if (clkd == 0)
1381		clkd = 1;
1382
1383	cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1384	timeout = timeout_ns / cycle_ns;
1385	timeout += timeout_clks;
1386	if (timeout) {
1387		while ((timeout & 0x80000000) == 0) {
1388			dto += 1;
1389			timeout <<= 1;
1390		}
1391		dto = 31 - dto;
1392		timeout <<= 1;
1393		if (timeout && dto)
1394			dto += 1;
1395		if (dto >= 13)
1396			dto -= 13;
1397		else
1398			dto = 0;
1399		if (dto > 14)
1400			dto = 14;
1401	}
1402
1403	reg &= ~DTO_MASK;
1404	reg |= dto << DTO_SHIFT;
1405	OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1406}
1407
1408/*
1409 * Configure block length for MMC/SD cards and initiate the transfer.
1410 */
1411static int
1412omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1413{
1414	int ret;
1415	host->data = req->data;
1416
1417	if (req->data == NULL) {
1418		OMAP_HSMMC_WRITE(host->base, BLK, 0);
1419		/*
1420		 * Set an arbitrary 100ms data timeout for commands with
1421		 * busy signal.
1422		 */
1423		if (req->cmd->flags & MMC_RSP_BUSY)
1424			set_data_timeout(host, 100000000U, 0);
1425		return 0;
1426	}
1427
1428	OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1429					| (req->data->blocks << 16));
1430	set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1431
1432	if (host->use_dma) {
1433		ret = omap_hsmmc_start_dma_transfer(host, req);
1434		if (ret != 0) {
1435			dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1436			return ret;
1437		}
1438	}
1439	return 0;
1440}
1441
1442static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1443				int err)
1444{
1445	struct omap_hsmmc_host *host = mmc_priv(mmc);
1446	struct mmc_data *data = mrq->data;
1447
1448	if (host->use_dma) {
1449		if (data->host_cookie)
1450			dma_unmap_sg(mmc_dev(host->mmc), data->sg,
1451				     data->sg_len,
1452				     omap_hsmmc_get_dma_dir(host, data));
1453		data->host_cookie = 0;
1454	}
1455}
1456
1457static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1458			       bool is_first_req)
1459{
1460	struct omap_hsmmc_host *host = mmc_priv(mmc);
1461
1462	if (mrq->data->host_cookie) {
1463		mrq->data->host_cookie = 0;
1464		return ;
1465	}
1466
1467	if (host->use_dma)
1468		if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1469						&host->next_data))
1470			mrq->data->host_cookie = 0;
1471}
1472
1473/*
1474 * Request function. for read/write operation
1475 */
1476static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1477{
1478	struct omap_hsmmc_host *host = mmc_priv(mmc);
1479	int err;
1480
1481	BUG_ON(host->req_in_progress);
1482	BUG_ON(host->dma_ch != -1);
1483	if (host->protect_card) {
1484		if (host->reqs_blocked < 3) {
1485			/*
1486			 * Ensure the controller is left in a consistent
1487			 * state by resetting the command and data state
1488			 * machines.
1489			 */
1490			omap_hsmmc_reset_controller_fsm(host, SRD);
1491			omap_hsmmc_reset_controller_fsm(host, SRC);
1492			host->reqs_blocked += 1;
1493		}
1494		req->cmd->error = -EBADF;
1495		if (req->data)
1496			req->data->error = -EBADF;
1497		req->cmd->retries = 0;
1498		mmc_request_done(mmc, req);
1499		return;
1500	} else if (host->reqs_blocked)
1501		host->reqs_blocked = 0;
1502	WARN_ON(host->mrq != NULL);
1503	host->mrq = req;
1504	err = omap_hsmmc_prepare_data(host, req);
1505	if (err) {
1506		req->cmd->error = err;
1507		if (req->data)
1508			req->data->error = err;
1509		host->mrq = NULL;
1510		mmc_request_done(mmc, req);
1511		return;
1512	}
1513
1514	omap_hsmmc_start_command(host, req->cmd, req->data);
1515}
1516
1517/* Routine to configure clock values. Exposed API to core */
1518static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1519{
1520	struct omap_hsmmc_host *host = mmc_priv(mmc);
1521	int do_send_init_stream = 0;
1522
1523	pm_runtime_get_sync(host->dev);
1524
1525	if (ios->power_mode != host->power_mode) {
1526		switch (ios->power_mode) {
1527		case MMC_POWER_OFF:
1528			mmc_slot(host).set_power(host->dev, host->slot_id,
1529						 0, 0);
1530			host->vdd = 0;
1531			break;
1532		case MMC_POWER_UP:
1533			mmc_slot(host).set_power(host->dev, host->slot_id,
1534						 1, ios->vdd);
1535			host->vdd = ios->vdd;
1536			break;
1537		case MMC_POWER_ON:
1538			do_send_init_stream = 1;
1539			break;
1540		}
1541		host->power_mode = ios->power_mode;
1542	}
1543
1544	/* FIXME: set registers based only on changes to ios */
1545
1546	omap_hsmmc_set_bus_width(host);
1547
1548	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1549		/* Only MMC1 can interface at 3V without some flavor
1550		 * of external transceiver; but they all handle 1.8V.
1551		 */
1552		if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1553			(ios->vdd == DUAL_VOLT_OCR_BIT) &&
1554			/*
1555			 * With pbias cell programming missing, this
1556			 * can't be allowed when booting with device
1557			 * tree.
1558			 */
1559			!host->dev->of_node) {
1560				/*
1561				 * The mmc_select_voltage fn of the core does
1562				 * not seem to set the power_mode to
1563				 * MMC_POWER_UP upon recalculating the voltage.
1564				 * vdd 1.8v.
1565				 */
1566			if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1567				dev_dbg(mmc_dev(host->mmc),
1568						"Switch operation failed\n");
1569		}
1570	}
1571
1572	omap_hsmmc_set_clock(host);
1573
1574	if (do_send_init_stream)
1575		send_init_stream(host);
1576
1577	omap_hsmmc_set_bus_mode(host);
1578
1579	pm_runtime_put_autosuspend(host->dev);
1580}
1581
1582static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1583{
1584	struct omap_hsmmc_host *host = mmc_priv(mmc);
1585
1586	if (!mmc_slot(host).card_detect)
1587		return -ENOSYS;
1588	return mmc_slot(host).card_detect(host->dev, host->slot_id);
1589}
1590
1591static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1592{
1593	struct omap_hsmmc_host *host = mmc_priv(mmc);
1594
1595	if (!mmc_slot(host).get_ro)
1596		return -ENOSYS;
1597	return mmc_slot(host).get_ro(host->dev, 0);
1598}
1599
1600static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1601{
1602	struct omap_hsmmc_host *host = mmc_priv(mmc);
1603
1604	if (mmc_slot(host).init_card)
1605		mmc_slot(host).init_card(card);
1606}
1607
1608static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1609{
1610	u32 hctl, capa, value;
1611
1612	/* Only MMC1 supports 3.0V */
1613	if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1614		hctl = SDVS30;
1615		capa = VS30 | VS18;
1616	} else {
1617		hctl = SDVS18;
1618		capa = VS18;
1619	}
1620
1621	value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1622	OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1623
1624	value = OMAP_HSMMC_READ(host->base, CAPA);
1625	OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1626
1627	/* Set the controller to AUTO IDLE mode */
1628	value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1629	OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1630
1631	/* Set SD bus power bit */
1632	set_sd_bus_power(host);
1633}
1634
1635static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1636{
1637	struct omap_hsmmc_host *host = mmc_priv(mmc);
1638
1639	pm_runtime_get_sync(host->dev);
1640
1641	return 0;
1642}
1643
1644static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
1645{
1646	struct omap_hsmmc_host *host = mmc_priv(mmc);
1647
1648	pm_runtime_mark_last_busy(host->dev);
1649	pm_runtime_put_autosuspend(host->dev);
1650
1651	return 0;
1652}
1653
1654static const struct mmc_host_ops omap_hsmmc_ops = {
1655	.enable = omap_hsmmc_enable_fclk,
1656	.disable = omap_hsmmc_disable_fclk,
1657	.post_req = omap_hsmmc_post_req,
1658	.pre_req = omap_hsmmc_pre_req,
1659	.request = omap_hsmmc_request,
1660	.set_ios = omap_hsmmc_set_ios,
1661	.get_cd = omap_hsmmc_get_cd,
1662	.get_ro = omap_hsmmc_get_ro,
1663	.init_card = omap_hsmmc_init_card,
1664	/* NYET -- enable_sdio_irq */
1665};
1666
1667#ifdef CONFIG_DEBUG_FS
1668
1669static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1670{
1671	struct mmc_host *mmc = s->private;
1672	struct omap_hsmmc_host *host = mmc_priv(mmc);
1673	int context_loss = 0;
1674
1675	if (host->pdata->get_context_loss_count)
1676		context_loss = host->pdata->get_context_loss_count(host->dev);
1677
1678	seq_printf(s, "mmc%d:\n ctx_loss:\t%d:%d\n\nregs:\n",
1679			mmc->index, host->context_loss, context_loss);
 
 
 
 
 
 
 
1680
1681	if (host->suspended) {
1682		seq_printf(s, "host suspended, can't read registers\n");
1683		return 0;
1684	}
1685
1686	pm_runtime_get_sync(host->dev);
1687
1688	seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1689			OMAP_HSMMC_READ(host->base, SYSCONFIG));
1690	seq_printf(s, "CON:\t\t0x%08x\n",
1691			OMAP_HSMMC_READ(host->base, CON));
1692	seq_printf(s, "HCTL:\t\t0x%08x\n",
1693			OMAP_HSMMC_READ(host->base, HCTL));
1694	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1695			OMAP_HSMMC_READ(host->base, SYSCTL));
1696	seq_printf(s, "IE:\t\t0x%08x\n",
1697			OMAP_HSMMC_READ(host->base, IE));
1698	seq_printf(s, "ISE:\t\t0x%08x\n",
1699			OMAP_HSMMC_READ(host->base, ISE));
1700	seq_printf(s, "CAPA:\t\t0x%08x\n",
1701			OMAP_HSMMC_READ(host->base, CAPA));
1702
1703	pm_runtime_mark_last_busy(host->dev);
1704	pm_runtime_put_autosuspend(host->dev);
1705
1706	return 0;
1707}
1708
1709static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1710{
1711	return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1712}
1713
1714static const struct file_operations mmc_regs_fops = {
1715	.open           = omap_hsmmc_regs_open,
1716	.read           = seq_read,
1717	.llseek         = seq_lseek,
1718	.release        = single_release,
1719};
1720
1721static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1722{
1723	if (mmc->debugfs_root)
1724		debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1725			mmc, &mmc_regs_fops);
1726}
1727
1728#else
1729
1730static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1731{
1732}
1733
1734#endif
1735
1736#ifdef CONFIG_OF
1737static u16 omap4_reg_offset = 0x100;
1738
1739static const struct of_device_id omap_mmc_of_match[] = {
1740	{
1741		.compatible = "ti,omap2-hsmmc",
1742	},
1743	{
1744		.compatible = "ti,omap3-hsmmc",
1745	},
1746	{
1747		.compatible = "ti,omap4-hsmmc",
1748		.data = &omap4_reg_offset,
1749	},
1750	{},
1751};
1752MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1753
1754static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1755{
1756	struct omap_mmc_platform_data *pdata;
1757	struct device_node *np = dev->of_node;
1758	u32 bus_width;
1759
1760	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1761	if (!pdata)
1762		return NULL; /* out of memory */
1763
1764	if (of_find_property(np, "ti,dual-volt", NULL))
1765		pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1766
1767	/* This driver only supports 1 slot */
1768	pdata->nr_slots = 1;
1769	pdata->slots[0].switch_pin = of_get_named_gpio(np, "cd-gpios", 0);
1770	pdata->slots[0].gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
1771
1772	if (of_find_property(np, "ti,non-removable", NULL)) {
1773		pdata->slots[0].nonremovable = true;
1774		pdata->slots[0].no_regulator_off_init = true;
1775	}
1776	of_property_read_u32(np, "bus-width", &bus_width);
1777	if (bus_width == 4)
1778		pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
1779	else if (bus_width == 8)
1780		pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
1781
1782	if (of_find_property(np, "ti,needs-special-reset", NULL))
1783		pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
1784
1785	return pdata;
1786}
1787#else
1788static inline struct omap_mmc_platform_data
1789			*of_get_hsmmc_pdata(struct device *dev)
1790{
1791	return NULL;
1792}
1793#endif
1794
1795static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
1796{
1797	struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1798	struct mmc_host *mmc;
1799	struct omap_hsmmc_host *host = NULL;
1800	struct resource *res;
1801	int ret, irq;
1802	const struct of_device_id *match;
1803
1804	match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
1805	if (match) {
1806		pdata = of_get_hsmmc_pdata(&pdev->dev);
1807		if (match->data) {
1808			u16 *offsetp = match->data;
1809			pdata->reg_offset = *offsetp;
1810		}
1811	}
1812
1813	if (pdata == NULL) {
1814		dev_err(&pdev->dev, "Platform Data is missing\n");
1815		return -ENXIO;
1816	}
1817
1818	if (pdata->nr_slots == 0) {
1819		dev_err(&pdev->dev, "No Slots\n");
1820		return -ENXIO;
1821	}
1822
1823	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1824	irq = platform_get_irq(pdev, 0);
1825	if (res == NULL || irq < 0)
1826		return -ENXIO;
1827
 
 
1828	res = request_mem_region(res->start, resource_size(res), pdev->name);
1829	if (res == NULL)
1830		return -EBUSY;
1831
1832	ret = omap_hsmmc_gpio_init(pdata);
1833	if (ret)
1834		goto err;
1835
1836	mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1837	if (!mmc) {
1838		ret = -ENOMEM;
1839		goto err_alloc;
1840	}
1841
1842	host		= mmc_priv(mmc);
1843	host->mmc	= mmc;
1844	host->pdata	= pdata;
1845	host->dev	= &pdev->dev;
1846	host->use_dma	= 1;
1847	host->dev->dma_mask = &pdata->dma_mask;
1848	host->dma_ch	= -1;
1849	host->irq	= irq;
 
1850	host->slot_id	= 0;
1851	host->mapbase	= res->start + pdata->reg_offset;
1852	host->base	= ioremap(host->mapbase, SZ_4K);
1853	host->power_mode = MMC_POWER_OFF;
1854	host->next_data.cookie = 1;
1855
1856	platform_set_drvdata(pdev, host);
 
1857
1858	mmc->ops	= &omap_hsmmc_ops;
1859
1860	/*
1861	 * If regulator_disable can only put vcc_aux to sleep then there is
1862	 * no off state.
1863	 */
1864	if (mmc_slot(host).vcc_aux_disable_is_sleep)
1865		mmc_slot(host).no_off = 1;
1866
1867	mmc->f_min = OMAP_MMC_MIN_CLOCK;
1868
1869	if (pdata->max_freq > 0)
1870		mmc->f_max = pdata->max_freq;
1871	else
1872		mmc->f_max = OMAP_MMC_MAX_CLOCK;
1873
1874	spin_lock_init(&host->irq_lock);
1875
1876	host->fclk = clk_get(&pdev->dev, "fck");
1877	if (IS_ERR(host->fclk)) {
1878		ret = PTR_ERR(host->fclk);
1879		host->fclk = NULL;
1880		goto err1;
1881	}
1882
1883	if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
1884		dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
1885		mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
1886	}
1887
1888	pm_runtime_enable(host->dev);
1889	pm_runtime_get_sync(host->dev);
1890	pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
1891	pm_runtime_use_autosuspend(host->dev);
1892
1893	omap_hsmmc_context_save(host);
 
 
 
 
 
 
 
 
 
1894
1895	host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1896	/*
1897	 * MMC can still work without debounce clock.
1898	 */
1899	if (IS_ERR(host->dbclk)) {
1900		dev_warn(mmc_dev(host->mmc), "Failed to get debounce clk\n");
1901		host->dbclk = NULL;
1902	} else if (clk_enable(host->dbclk) != 0) {
1903		dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
1904		clk_put(host->dbclk);
1905		host->dbclk = NULL;
1906	}
1907
1908	/* Since we do only SG emulation, we can have as many segs
1909	 * as we want. */
1910	mmc->max_segs = 1024;
1911
1912	mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1913	mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1914	mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1915	mmc->max_seg_size = mmc->max_req_size;
1916
1917	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1918		     MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
1919
1920	mmc->caps |= mmc_slot(host).caps;
1921	if (mmc->caps & MMC_CAP_8_BIT_DATA)
1922		mmc->caps |= MMC_CAP_4_BIT_DATA;
1923
1924	if (mmc_slot(host).nonremovable)
1925		mmc->caps |= MMC_CAP_NONREMOVABLE;
1926
1927	mmc->pm_caps = mmc_slot(host).pm_caps;
1928
1929	omap_hsmmc_conf_bus_power(host);
1930
1931	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1932	if (!res) {
1933		dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
1934		goto err_irq;
1935	}
1936	host->dma_line_tx = res->start;
1937
1938	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1939	if (!res) {
1940		dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1941		goto err_irq;
1942	}
1943	host->dma_line_rx = res->start;
1944
1945	/* Request IRQ for MMC operations */
1946	ret = request_irq(host->irq, omap_hsmmc_irq, 0,
1947			mmc_hostname(mmc), host);
1948	if (ret) {
1949		dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1950		goto err_irq;
1951	}
1952
1953	if (pdata->init != NULL) {
1954		if (pdata->init(&pdev->dev) != 0) {
1955			dev_dbg(mmc_dev(host->mmc),
1956				"Unable to configure MMC IRQs\n");
1957			goto err_irq_cd_init;
1958		}
1959	}
1960
1961	if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
1962		ret = omap_hsmmc_reg_get(host);
1963		if (ret)
1964			goto err_reg;
1965		host->use_reg = 1;
1966	}
1967
1968	mmc->ocr_avail = mmc_slot(host).ocr_mask;
1969
1970	/* Request IRQ for card detect */
1971	if ((mmc_slot(host).card_detect_irq)) {
1972		ret = request_threaded_irq(mmc_slot(host).card_detect_irq,
1973					   NULL,
1974					   omap_hsmmc_detect,
1975					   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1976					   mmc_hostname(mmc), host);
1977		if (ret) {
1978			dev_dbg(mmc_dev(host->mmc),
1979				"Unable to grab MMC CD IRQ\n");
1980			goto err_irq_cd;
1981		}
1982		pdata->suspend = omap_hsmmc_suspend_cdirq;
1983		pdata->resume = omap_hsmmc_resume_cdirq;
1984	}
1985
1986	omap_hsmmc_disable_irq(host);
1987
1988	omap_hsmmc_protect_card(host);
1989
1990	mmc_add_host(mmc);
1991
1992	if (mmc_slot(host).name != NULL) {
1993		ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1994		if (ret < 0)
1995			goto err_slot_name;
1996	}
1997	if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
1998		ret = device_create_file(&mmc->class_dev,
1999					&dev_attr_cover_switch);
2000		if (ret < 0)
2001			goto err_slot_name;
2002	}
2003
2004	omap_hsmmc_debugfs(mmc);
2005	pm_runtime_mark_last_busy(host->dev);
2006	pm_runtime_put_autosuspend(host->dev);
2007
2008	return 0;
2009
2010err_slot_name:
2011	mmc_remove_host(mmc);
2012	free_irq(mmc_slot(host).card_detect_irq, host);
2013err_irq_cd:
2014	if (host->use_reg)
2015		omap_hsmmc_reg_put(host);
2016err_reg:
2017	if (host->pdata->cleanup)
2018		host->pdata->cleanup(&pdev->dev);
2019err_irq_cd_init:
2020	free_irq(host->irq, host);
2021err_irq:
2022	pm_runtime_put_sync(host->dev);
2023	pm_runtime_disable(host->dev);
2024	clk_put(host->fclk);
2025	if (host->dbclk) {
2026		clk_disable(host->dbclk);
2027		clk_put(host->dbclk);
2028	}
2029err1:
2030	iounmap(host->base);
2031	platform_set_drvdata(pdev, NULL);
2032	mmc_free_host(mmc);
2033err_alloc:
2034	omap_hsmmc_gpio_free(pdata);
2035err:
2036	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2037	if (res)
2038		release_mem_region(res->start, resource_size(res));
2039	return ret;
2040}
2041
2042static int __devexit omap_hsmmc_remove(struct platform_device *pdev)
2043{
2044	struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2045	struct resource *res;
2046
2047	pm_runtime_get_sync(host->dev);
2048	mmc_remove_host(host->mmc);
2049	if (host->use_reg)
2050		omap_hsmmc_reg_put(host);
2051	if (host->pdata->cleanup)
2052		host->pdata->cleanup(&pdev->dev);
2053	free_irq(host->irq, host);
2054	if (mmc_slot(host).card_detect_irq)
2055		free_irq(mmc_slot(host).card_detect_irq, host);
2056
2057	pm_runtime_put_sync(host->dev);
2058	pm_runtime_disable(host->dev);
2059	clk_put(host->fclk);
2060	if (host->dbclk) {
2061		clk_disable(host->dbclk);
2062		clk_put(host->dbclk);
 
 
 
 
 
 
 
2063	}
2064
2065	mmc_free_host(host->mmc);
2066	iounmap(host->base);
2067	omap_hsmmc_gpio_free(pdev->dev.platform_data);
2068
2069	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2070	if (res)
2071		release_mem_region(res->start, resource_size(res));
2072	platform_set_drvdata(pdev, NULL);
2073
2074	return 0;
2075}
2076
2077#ifdef CONFIG_PM
2078static int omap_hsmmc_suspend(struct device *dev)
2079{
2080	int ret = 0;
2081	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2082
2083	if (!host)
2084		return 0;
2085
2086	if (host && host->suspended)
2087		return 0;
2088
2089	pm_runtime_get_sync(host->dev);
2090	host->suspended = 1;
2091	if (host->pdata->suspend) {
2092		ret = host->pdata->suspend(dev, host->slot_id);
2093		if (ret) {
2094			dev_dbg(dev, "Unable to handle MMC board"
 
 
 
2095					" level suspend\n");
2096			host->suspended = 0;
2097			return ret;
2098		}
2099	}
2100	ret = mmc_suspend_host(host->mmc);
2101
2102	if (ret) {
2103		host->suspended = 0;
2104		if (host->pdata->resume) {
2105			ret = host->pdata->resume(dev, host->slot_id);
2106			if (ret)
2107				dev_dbg(dev, "Unmask interrupt failed\n");
2108		}
2109		goto err;
2110	}
2111
2112	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2113		omap_hsmmc_disable_irq(host);
2114		OMAP_HSMMC_WRITE(host->base, HCTL,
2115				OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
 
 
 
 
 
 
 
 
 
 
 
 
 
2116	}
2117
2118	if (host->dbclk)
2119		clk_disable(host->dbclk);
2120err:
2121	pm_runtime_put_sync(host->dev);
2122	return ret;
2123}
2124
2125/* Routine to resume the MMC device */
2126static int omap_hsmmc_resume(struct device *dev)
2127{
2128	int ret = 0;
2129	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2130
2131	if (!host)
2132		return 0;
2133
2134	if (host && !host->suspended)
2135		return 0;
2136
2137	pm_runtime_get_sync(host->dev);
 
2138
2139	if (host->dbclk)
2140		clk_enable(host->dbclk);
2141
2142	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2143		omap_hsmmc_conf_bus_power(host);
2144
2145	if (host->pdata->resume) {
2146		ret = host->pdata->resume(dev, host->slot_id);
2147		if (ret)
2148			dev_dbg(dev, "Unmask interrupt failed\n");
2149	}
 
2150
2151	omap_hsmmc_protect_card(host);
2152
2153	/* Notify the core to resume the host */
2154	ret = mmc_resume_host(host->mmc);
2155	if (ret == 0)
2156		host->suspended = 0;
2157
2158	pm_runtime_mark_last_busy(host->dev);
2159	pm_runtime_put_autosuspend(host->dev);
 
2160
2161	return ret;
2162
2163}
2164
2165#else
2166#define omap_hsmmc_suspend	NULL
2167#define omap_hsmmc_resume		NULL
2168#endif
2169
2170static int omap_hsmmc_runtime_suspend(struct device *dev)
2171{
2172	struct omap_hsmmc_host *host;
2173
2174	host = platform_get_drvdata(to_platform_device(dev));
2175	omap_hsmmc_context_save(host);
2176	dev_dbg(dev, "disabled\n");
2177
2178	return 0;
2179}
2180
2181static int omap_hsmmc_runtime_resume(struct device *dev)
2182{
2183	struct omap_hsmmc_host *host;
2184
2185	host = platform_get_drvdata(to_platform_device(dev));
2186	omap_hsmmc_context_restore(host);
2187	dev_dbg(dev, "enabled\n");
2188
2189	return 0;
2190}
2191
2192static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2193	.suspend	= omap_hsmmc_suspend,
2194	.resume		= omap_hsmmc_resume,
2195	.runtime_suspend = omap_hsmmc_runtime_suspend,
2196	.runtime_resume = omap_hsmmc_runtime_resume,
2197};
2198
2199static struct platform_driver omap_hsmmc_driver = {
2200	.probe		= omap_hsmmc_probe,
2201	.remove		= __devexit_p(omap_hsmmc_remove),
2202	.driver		= {
2203		.name = DRIVER_NAME,
2204		.owner = THIS_MODULE,
2205		.pm = &omap_hsmmc_dev_pm_ops,
2206		.of_match_table = of_match_ptr(omap_mmc_of_match),
2207	},
2208};
2209
2210module_platform_driver(omap_hsmmc_driver);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2211MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2212MODULE_LICENSE("GPL");
2213MODULE_ALIAS("platform:" DRIVER_NAME);
2214MODULE_AUTHOR("Texas Instruments Inc");