1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Freescale eSDHC i.MX controller driver for the platform bus.
   4 *
   5 * derived from the OF-version.
   6 *
   7 * Copyright (c) 2010 Pengutronix e.K.
   8 *   Author: Wolfram Sang <kernel@pengutronix.de>
 
 
 
 
   9 */
  10
  11#include <linux/bitfield.h>
  12#include <linux/io.h>
  13#include <linux/iopoll.h>
  14#include <linux/delay.h>
  15#include <linux/err.h>
  16#include <linux/clk.h>
 
  17#include <linux/module.h>
  18#include <linux/slab.h>
  19#include <linux/pm_qos.h>
  20#include <linux/mmc/host.h>
  21#include <linux/mmc/mmc.h>
  22#include <linux/mmc/sdio.h>
  23#include <linux/mmc/slot-gpio.h>
  24#include <linux/of.h>
  25#include <linux/of_device.h>
  26#include <linux/pinctrl/consumer.h>
  27#include <linux/pm_runtime.h>
  28#include "sdhci-cqhci.h"
  29#include "sdhci-pltfm.h"
  30#include "sdhci-esdhc.h"
  31#include "cqhci.h"
  32
  33#define ESDHC_SYS_CTRL_DTOCV_MASK	0x0f
  34#define	ESDHC_CTRL_D3CD			0x08
  35#define ESDHC_BURST_LEN_EN_INCR		(1 << 27)
  36/* VENDOR SPEC register */
  37#define ESDHC_VENDOR_SPEC		0xc0
  38#define  ESDHC_VENDOR_SPEC_SDIO_QUIRK	(1 << 1)
  39#define  ESDHC_VENDOR_SPEC_VSELECT	(1 << 1)
  40#define  ESDHC_VENDOR_SPEC_FRC_SDCLK_ON	(1 << 8)
  41#define ESDHC_DEBUG_SEL_AND_STATUS_REG		0xc2
  42#define ESDHC_DEBUG_SEL_REG			0xc3
  43#define ESDHC_DEBUG_SEL_MASK			0xf
  44#define ESDHC_DEBUG_SEL_CMD_STATE		1
  45#define ESDHC_DEBUG_SEL_DATA_STATE		2
  46#define ESDHC_DEBUG_SEL_TRANS_STATE		3
  47#define ESDHC_DEBUG_SEL_DMA_STATE		4
  48#define ESDHC_DEBUG_SEL_ADMA_STATE		5
  49#define ESDHC_DEBUG_SEL_FIFO_STATE		6
  50#define ESDHC_DEBUG_SEL_ASYNC_FIFO_STATE	7
  51#define ESDHC_WTMK_LVL			0x44
  52#define  ESDHC_WTMK_DEFAULT_VAL		0x10401040
  53#define  ESDHC_WTMK_LVL_RD_WML_MASK	0x000000FF
  54#define  ESDHC_WTMK_LVL_RD_WML_SHIFT	0
  55#define  ESDHC_WTMK_LVL_WR_WML_MASK	0x00FF0000
  56#define  ESDHC_WTMK_LVL_WR_WML_SHIFT	16
  57#define  ESDHC_WTMK_LVL_WML_VAL_DEF	64
  58#define  ESDHC_WTMK_LVL_WML_VAL_MAX	128
  59#define ESDHC_MIX_CTRL			0x48
  60#define  ESDHC_MIX_CTRL_DDREN		(1 << 3)
  61#define  ESDHC_MIX_CTRL_AC23EN		(1 << 7)
  62#define  ESDHC_MIX_CTRL_EXE_TUNE	(1 << 22)
  63#define  ESDHC_MIX_CTRL_SMPCLK_SEL	(1 << 23)
  64#define  ESDHC_MIX_CTRL_AUTO_TUNE_EN	(1 << 24)
  65#define  ESDHC_MIX_CTRL_FBCLK_SEL	(1 << 25)
  66#define  ESDHC_MIX_CTRL_HS400_EN	(1 << 26)
  67#define  ESDHC_MIX_CTRL_HS400_ES_EN	(1 << 27)
  68/* Bits 3 and 6 are not SDHCI standard definitions */
  69#define  ESDHC_MIX_CTRL_SDHCI_MASK	0xb7
  70/* Tuning bits */
  71#define  ESDHC_MIX_CTRL_TUNING_MASK	0x03c00000
  72
  73/* dll control register */
  74#define ESDHC_DLL_CTRL			0x60
  75#define ESDHC_DLL_OVERRIDE_VAL_SHIFT	9
  76#define ESDHC_DLL_OVERRIDE_EN_SHIFT	8
  77
  78/* tune control register */
  79#define ESDHC_TUNE_CTRL_STATUS		0x68
  80#define  ESDHC_TUNE_CTRL_STEP		1
  81#define  ESDHC_TUNE_CTRL_MIN		0
  82#define  ESDHC_TUNE_CTRL_MAX		((1 << 7) - 1)
  83
  84/* strobe dll register */
  85#define ESDHC_STROBE_DLL_CTRL		0x70
  86#define ESDHC_STROBE_DLL_CTRL_ENABLE	(1 << 0)
  87#define ESDHC_STROBE_DLL_CTRL_RESET	(1 << 1)
  88#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT	0x7
  89#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT	3
  90#define ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT	(4 << 20)
  91
  92#define ESDHC_STROBE_DLL_STATUS		0x74
  93#define ESDHC_STROBE_DLL_STS_REF_LOCK	(1 << 1)
  94#define ESDHC_STROBE_DLL_STS_SLV_LOCK	0x1
  95
  96#define ESDHC_VEND_SPEC2		0xc8
  97#define ESDHC_VEND_SPEC2_EN_BUSY_IRQ	(1 << 8)
  98#define ESDHC_VEND_SPEC2_AUTO_TUNE_8BIT_EN	(1 << 4)
  99#define ESDHC_VEND_SPEC2_AUTO_TUNE_4BIT_EN	(0 << 4)
 100#define ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN	(2 << 4)
 101#define ESDHC_VEND_SPEC2_AUTO_TUNE_CMD_EN	(1 << 6)
 102#define ESDHC_VEND_SPEC2_AUTO_TUNE_MODE_MASK	(7 << 4)
 103
 104#define ESDHC_TUNING_CTRL		0xcc
 105#define ESDHC_STD_TUNING_EN		(1 << 24)
 106/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
 107#define ESDHC_TUNING_START_TAP_DEFAULT	0x1
 108#define ESDHC_TUNING_START_TAP_MASK	0x7f
 109#define ESDHC_TUNING_CMD_CRC_CHECK_DISABLE	(1 << 7)
 110#define ESDHC_TUNING_STEP_DEFAULT	0x1
 111#define ESDHC_TUNING_STEP_MASK		0x00070000
 112#define ESDHC_TUNING_STEP_SHIFT		16
 113
 114/* pinctrl state */
 115#define ESDHC_PINCTRL_STATE_100MHZ	"state_100mhz"
 116#define ESDHC_PINCTRL_STATE_200MHZ	"state_200mhz"
 117
 118/*
 119 * Our interpretation of the SDHCI_HOST_CONTROL register
 120 */
 121#define ESDHC_CTRL_4BITBUS		(0x1 << 1)
 122#define ESDHC_CTRL_8BITBUS		(0x2 << 1)
 123#define ESDHC_CTRL_BUSWIDTH_MASK	(0x3 << 1)
 124#define USDHC_GET_BUSWIDTH(c) (c & ESDHC_CTRL_BUSWIDTH_MASK)
 125
 126/*
 127 * There is an INT DMA ERR mismatch between eSDHC and STD SDHC SPEC:
 128 * Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
 129 * but bit28 is used as the INT DMA ERR in fsl eSDHC design.
 130 * Define this macro DMA error INT for fsl eSDHC
 131 */
 132#define ESDHC_INT_VENDOR_SPEC_DMA_ERR	(1 << 28)
 133
 134/* the address offset of CQHCI */
 135#define ESDHC_CQHCI_ADDR_OFFSET		0x100
 136
 137/*
 138 * The CMDTYPE of the CMD register (offset 0xE) should be set to
 139 * "11" when the STOP CMD12 is issued on imx53 to abort one
 140 * open ended multi-blk IO. Otherwise the TC INT wouldn't
 141 * be generated.
 142 * In exact block transfer, the controller doesn't complete the
 143 * operations automatically as required at the end of the
 144 * transfer and remains on hold if the abort command is not sent.
 145 * As a result, the TC flag is not asserted and SW received timeout
 146 * exception. Bit1 of Vendor Spec register is used to fix it.
 147 */
 148#define ESDHC_FLAG_MULTIBLK_NO_INT	BIT(1)
 149/*
 150 * The flag tells that the ESDHC controller is an USDHC block that is
 151 * integrated on the i.MX6 series.
 152 */
 153#define ESDHC_FLAG_USDHC		BIT(3)
 154/* The IP supports manual tuning process */
 155#define ESDHC_FLAG_MAN_TUNING		BIT(4)
 156/* The IP supports standard tuning process */
 157#define ESDHC_FLAG_STD_TUNING		BIT(5)
 158/* The IP has SDHCI_CAPABILITIES_1 register */
 159#define ESDHC_FLAG_HAVE_CAP1		BIT(6)
 160/*
 161 * The IP has erratum ERR004536
 162 * uSDHC: ADMA Length Mismatch Error occurs if the AHB read access is slow,
 163 * when reading data from the card
 164 * This flag is also set for i.MX25 and i.MX35 in order to get
 165 * SDHCI_QUIRK_BROKEN_ADMA, but for different reasons (ADMA capability bits).
 166 */
 167#define ESDHC_FLAG_ERR004536		BIT(7)
 168/* The IP supports HS200 mode */
 169#define ESDHC_FLAG_HS200		BIT(8)
 170/* The IP supports HS400 mode */
 171#define ESDHC_FLAG_HS400		BIT(9)
 172/*
 173 * The IP has errata ERR010450
 174 * uSDHC: Due to the I/O timing limit, for SDR mode, SD card clock can't
 175 * exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
 176 */
 177#define ESDHC_FLAG_ERR010450		BIT(10)
 178/* The IP supports HS400ES mode */
 179#define ESDHC_FLAG_HS400_ES		BIT(11)
 180/* The IP has Host Controller Interface for Command Queuing */
 181#define ESDHC_FLAG_CQHCI		BIT(12)
 182/* need request pmqos during low power */
 183#define ESDHC_FLAG_PMQOS		BIT(13)
 184/* The IP state got lost in low power mode */
 185#define ESDHC_FLAG_STATE_LOST_IN_LPMODE		BIT(14)
 186/* The IP lost clock rate in PM_RUNTIME */
 187#define ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME	BIT(15)
 188/*
 189 * The IP do not support the ACMD23 feature completely when use ADMA mode.
 190 * In ADMA mode, it only use the 16 bit block count of the register 0x4
 191 * (BLOCK_ATT) as the CMD23's argument for ACMD23 mode, which means it will
 192 * ignore the upper 16 bit of the CMD23's argument. This will block the reliable
 193 * write operation in RPMB, because RPMB reliable write need to set the bit31
 194 * of the CMD23's argument.
 195 * imx6qpdl/imx6sx/imx6sl/imx7d has this limitation only for ADMA mode, SDMA
 196 * do not has this limitation. so when these SoC use ADMA mode, it need to
 197 * disable the ACMD23 feature.
 198 */
 199#define ESDHC_FLAG_BROKEN_AUTO_CMD23	BIT(16)
 200
 201/* ERR004536 is not applicable for the IP  */
 202#define ESDHC_FLAG_SKIP_ERR004536	BIT(17)
 203
 204enum wp_types {
 205	ESDHC_WP_NONE,		/* no WP, neither controller nor gpio */
 206	ESDHC_WP_CONTROLLER,	/* mmc controller internal WP */
 207	ESDHC_WP_GPIO,		/* external gpio pin for WP */
 208};
 209
 210enum cd_types {
 211	ESDHC_CD_NONE,		/* no CD, neither controller nor gpio */
 212	ESDHC_CD_CONTROLLER,	/* mmc controller internal CD */
 213	ESDHC_CD_GPIO,		/* external gpio pin for CD */
 214	ESDHC_CD_PERMANENT,	/* no CD, card permanently wired to host */
 215};
 216
 217/*
 218 * struct esdhc_platform_data - platform data for esdhc on i.MX
 219 *
 220 * ESDHC_WP(CD)_CONTROLLER type is not available on i.MX25/35.
 221 *
 222 * @wp_type:	type of write_protect method (see wp_types enum above)
 223 * @cd_type:	type of card_detect method (see cd_types enum above)
 224 */
 225
 226struct esdhc_platform_data {
 227	enum wp_types wp_type;
 228	enum cd_types cd_type;
 229	int max_bus_width;
 230	unsigned int delay_line;
 231	unsigned int tuning_step;       /* The delay cell steps in tuning procedure */
 232	unsigned int tuning_start_tap;	/* The start delay cell point in tuning procedure */
 233	unsigned int strobe_dll_delay_target;	/* The delay cell for strobe pad (read clock) */
 234};
 235
 236struct esdhc_soc_data {
 237	u32 flags;
 238};
 239
 240static const struct esdhc_soc_data esdhc_imx25_data = {
 241	.flags = ESDHC_FLAG_ERR004536,
 242};
 243
 244static const struct esdhc_soc_data esdhc_imx35_data = {
 245	.flags = ESDHC_FLAG_ERR004536,
 246};
 247
 248static const struct esdhc_soc_data esdhc_imx51_data = {
 249	.flags = 0,
 250};
 251
 252static const struct esdhc_soc_data esdhc_imx53_data = {
 253	.flags = ESDHC_FLAG_MULTIBLK_NO_INT,
 254};
 255
 256static const struct esdhc_soc_data usdhc_imx6q_data = {
 257	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
 258			| ESDHC_FLAG_BROKEN_AUTO_CMD23,
 259};
 260
 261static const struct esdhc_soc_data usdhc_imx6sl_data = {
 262	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 263			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
 264			| ESDHC_FLAG_HS200
 265			| ESDHC_FLAG_BROKEN_AUTO_CMD23,
 266};
 267
 268static const struct esdhc_soc_data usdhc_imx6sll_data = {
 269	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 270			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 271			| ESDHC_FLAG_HS400
 272			| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
 273};
 274
 275static const struct esdhc_soc_data usdhc_imx6sx_data = {
 276	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 277			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 278			| ESDHC_FLAG_STATE_LOST_IN_LPMODE
 279			| ESDHC_FLAG_BROKEN_AUTO_CMD23,
 280};
 281
 282static const struct esdhc_soc_data usdhc_imx6ull_data = {
 283	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 284			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 285			| ESDHC_FLAG_ERR010450
 286			| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
 287};
 288
 289static const struct esdhc_soc_data usdhc_imx7d_data = {
 290	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 291			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 292			| ESDHC_FLAG_HS400
 293			| ESDHC_FLAG_STATE_LOST_IN_LPMODE
 294			| ESDHC_FLAG_BROKEN_AUTO_CMD23,
 295};
 296
 297static struct esdhc_soc_data usdhc_s32g2_data = {
 298	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
 299			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 300			| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
 301			| ESDHC_FLAG_SKIP_ERR004536,
 302};
 303
 304static struct esdhc_soc_data usdhc_imx7ulp_data = {
 305	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 306			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 307			| ESDHC_FLAG_PMQOS | ESDHC_FLAG_HS400
 308			| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
 309};
 310static struct esdhc_soc_data usdhc_imxrt1050_data = {
 311	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 312			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
 313};
 314
 315static struct esdhc_soc_data usdhc_imx8qxp_data = {
 316	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 317			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 318			| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
 319			| ESDHC_FLAG_STATE_LOST_IN_LPMODE
 320			| ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME,
 321};
 322
 323static struct esdhc_soc_data usdhc_imx8mm_data = {
 324	.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
 325			| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
 326			| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
 327			| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
 328};
 329
 330struct pltfm_imx_data {
 
 331	u32 scratchpad;
 332	struct pinctrl *pinctrl;
 333	struct pinctrl_state *pins_100mhz;
 334	struct pinctrl_state *pins_200mhz;
 335	const struct esdhc_soc_data *socdata;
 336	struct esdhc_platform_data boarddata;
 337	struct clk *clk_ipg;
 338	struct clk *clk_ahb;
 339	struct clk *clk_per;
 340	unsigned int actual_clock;
 341	enum {
 342		NO_CMD_PENDING,      /* no multiblock command pending */
 343		MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */
 344		WAIT_FOR_INT,        /* sent CMD12, waiting for response INT */
 345	} multiblock_status;
 346	u32 is_ddr;
 347	struct pm_qos_request pm_qos_req;
 348};
 349
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 350static const struct of_device_id imx_esdhc_dt_ids[] = {
 351	{ .compatible = "fsl,imx25-esdhc", .data = &esdhc_imx25_data, },
 352	{ .compatible = "fsl,imx35-esdhc", .data = &esdhc_imx35_data, },
 353	{ .compatible = "fsl,imx51-esdhc", .data = &esdhc_imx51_data, },
 354	{ .compatible = "fsl,imx53-esdhc", .data = &esdhc_imx53_data, },
 355	{ .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, },
 356	{ .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
 357	{ .compatible = "fsl,imx6sll-usdhc", .data = &usdhc_imx6sll_data, },
 358	{ .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
 359	{ .compatible = "fsl,imx6ull-usdhc", .data = &usdhc_imx6ull_data, },
 360	{ .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
 361	{ .compatible = "fsl,imx7ulp-usdhc", .data = &usdhc_imx7ulp_data, },
 362	{ .compatible = "fsl,imx8qxp-usdhc", .data = &usdhc_imx8qxp_data, },
 363	{ .compatible = "fsl,imx8mm-usdhc", .data = &usdhc_imx8mm_data, },
 364	{ .compatible = "fsl,imxrt1050-usdhc", .data = &usdhc_imxrt1050_data, },
 365	{ .compatible = "nxp,s32g2-usdhc", .data = &usdhc_s32g2_data, },
 366	{ /* sentinel */ }
 367};
 368MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
 369
 370static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
 371{
 372	return data->socdata == &esdhc_imx25_data;
 373}
 374
 375static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
 
 
 
 
 
 376{
 377	return data->socdata == &esdhc_imx53_data;
 378}
 379
 380static inline int esdhc_is_usdhc(struct pltfm_imx_data *data)
 381{
 382	return !!(data->socdata->flags & ESDHC_FLAG_USDHC);
 383}
 384
 385static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
 386{
 387	void __iomem *base = host->ioaddr + (reg & ~0x3);
 388	u32 shift = (reg & 0x3) * 8;
 389
 390	writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
 391}
 392
 393#define DRIVER_NAME "sdhci-esdhc-imx"
 394#define ESDHC_IMX_DUMP(f, x...) \
 395	pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
 396static void esdhc_dump_debug_regs(struct sdhci_host *host)
 397{
 398	int i;
 399	char *debug_status[7] = {
 400				 "cmd debug status",
 401				 "data debug status",
 402				 "trans debug status",
 403				 "dma debug status",
 404				 "adma debug status",
 405				 "fifo debug status",
 406				 "async fifo debug status"
 407	};
 408
 409	ESDHC_IMX_DUMP("========= ESDHC IMX DEBUG STATUS DUMP =========\n");
 410	for (i = 0; i < 7; i++) {
 411		esdhc_clrset_le(host, ESDHC_DEBUG_SEL_MASK,
 412			ESDHC_DEBUG_SEL_CMD_STATE + i, ESDHC_DEBUG_SEL_REG);
 413		ESDHC_IMX_DUMP("%s:  0x%04x\n", debug_status[i],
 414			readw(host->ioaddr + ESDHC_DEBUG_SEL_AND_STATUS_REG));
 415	}
 416
 417	esdhc_clrset_le(host, ESDHC_DEBUG_SEL_MASK, 0, ESDHC_DEBUG_SEL_REG);
 418
 419}
 420
 421static inline void esdhc_wait_for_card_clock_gate_off(struct sdhci_host *host)
 422{
 423	u32 present_state;
 424	int ret;
 425
 426	ret = readl_poll_timeout(host->ioaddr + ESDHC_PRSSTAT, present_state,
 427				(present_state & ESDHC_CLOCK_GATE_OFF), 2, 100);
 428	if (ret == -ETIMEDOUT)
 429		dev_warn(mmc_dev(host->mmc), "%s: card clock still not gate off in 100us!.\n", __func__);
 430}
 431
 432/* Enable the auto tuning circuit to check the CMD line and BUS line */
 433static inline void usdhc_auto_tuning_mode_sel(struct sdhci_host *host)
 434{
 435	u32 buswidth, auto_tune_buswidth;
 436
 437	buswidth = USDHC_GET_BUSWIDTH(readl(host->ioaddr + SDHCI_HOST_CONTROL));
 438
 439	switch (buswidth) {
 440	case ESDHC_CTRL_8BITBUS:
 441		auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_8BIT_EN;
 442		break;
 443	case ESDHC_CTRL_4BITBUS:
 444		auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_4BIT_EN;
 445		break;
 446	default:	/* 1BITBUS */
 447		auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN;
 448		break;
 449	}
 450
 451	esdhc_clrset_le(host, ESDHC_VEND_SPEC2_AUTO_TUNE_MODE_MASK,
 452			auto_tune_buswidth | ESDHC_VEND_SPEC2_AUTO_TUNE_CMD_EN,
 453			ESDHC_VEND_SPEC2);
 454}
 455
 456static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
 457{
 458	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 459	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 460	u32 val = readl(host->ioaddr + reg);
 461
 462	if (unlikely(reg == SDHCI_PRESENT_STATE)) {
 463		u32 fsl_prss = val;
 464		/* save the least 20 bits */
 465		val = fsl_prss & 0x000FFFFF;
 466		/* move dat[0-3] bits */
 467		val |= (fsl_prss & 0x0F000000) >> 4;
 468		/* move cmd line bit */
 469		val |= (fsl_prss & 0x00800000) << 1;
 470	}
 471
 472	if (unlikely(reg == SDHCI_CAPABILITIES)) {
 473		/* ignore bit[0-15] as it stores cap_1 register val for mx6sl */
 474		if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
 475			val &= 0xffff0000;
 476
 477		/* In FSL esdhc IC module, only bit20 is used to indicate the
 478		 * ADMA2 capability of esdhc, but this bit is messed up on
 479		 * some SOCs (e.g. on MX25, MX35 this bit is set, but they
 480		 * don't actually support ADMA2). So set the BROKEN_ADMA
 481		 * quirk on MX25/35 platforms.
 482		 */
 483
 484		if (val & SDHCI_CAN_DO_ADMA1) {
 485			val &= ~SDHCI_CAN_DO_ADMA1;
 486			val |= SDHCI_CAN_DO_ADMA2;
 487		}
 488	}
 489
 490	if (unlikely(reg == SDHCI_CAPABILITIES_1)) {
 491		if (esdhc_is_usdhc(imx_data)) {
 492			if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
 493				val = readl(host->ioaddr + SDHCI_CAPABILITIES) & 0xFFFF;
 494			else
 495				/* imx6q/dl does not have cap_1 register, fake one */
 496				val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
 497					| SDHCI_SUPPORT_SDR50
 498					| SDHCI_USE_SDR50_TUNING
 499					| FIELD_PREP(SDHCI_RETUNING_MODE_MASK,
 500						     SDHCI_TUNING_MODE_3);
 501
 502			/*
 503			 * Do not advertise faster UHS modes if there are no
 504			 * pinctrl states for 100MHz/200MHz.
 505			 */
 506			if (IS_ERR_OR_NULL(imx_data->pins_100mhz))
 507				val &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50);
 508			if (IS_ERR_OR_NULL(imx_data->pins_200mhz))
 509				val &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_HS400);
 510		}
 511	}
 512
 513	if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
 514		val = 0;
 515		val |= FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, 0xFF);
 516		val |= FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, 0xFF);
 517		val |= FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, 0xFF);
 518	}
 519
 520	if (unlikely(reg == SDHCI_INT_STATUS)) {
 521		if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) {
 522			val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR;
 523			val |= SDHCI_INT_ADMA_ERROR;
 524		}
 525
 526		/*
 527		 * mask off the interrupt we get in response to the manually
 528		 * sent CMD12
 529		 */
 530		if ((imx_data->multiblock_status == WAIT_FOR_INT) &&
 531		    ((val & SDHCI_INT_RESPONSE) == SDHCI_INT_RESPONSE)) {
 532			val &= ~SDHCI_INT_RESPONSE;
 533			writel(SDHCI_INT_RESPONSE, host->ioaddr +
 534						   SDHCI_INT_STATUS);
 535			imx_data->multiblock_status = NO_CMD_PENDING;
 536		}
 537	}
 538
 539	return val;
 540}
 541
 542static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
 543{
 544	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 545	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 
 546	u32 data;
 547
 548	if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE ||
 549			reg == SDHCI_INT_STATUS)) {
 550		if ((val & SDHCI_INT_CARD_INT) && !esdhc_is_usdhc(imx_data)) {
 
 
 
 
 
 
 551			/*
 552			 * Clear and then set D3CD bit to avoid missing the
 553			 * card interrupt. This is an eSDHC controller problem
 554			 * so we need to apply the following workaround: clear
 555			 * and set D3CD bit will make eSDHC re-sample the card
 556			 * interrupt. In case a card interrupt was lost,
 557			 * re-sample it by the following steps.
 558			 */
 559			data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
 560			data &= ~ESDHC_CTRL_D3CD;
 561			writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
 562			data |= ESDHC_CTRL_D3CD;
 563			writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
 564		}
 565
 566		if (val & SDHCI_INT_ADMA_ERROR) {
 567			val &= ~SDHCI_INT_ADMA_ERROR;
 568			val |= ESDHC_INT_VENDOR_SPEC_DMA_ERR;
 569		}
 570	}
 571
 572	if (unlikely((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
 573				&& (reg == SDHCI_INT_STATUS)
 574				&& (val & SDHCI_INT_DATA_END))) {
 575			u32 v;
 576			v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 577			v &= ~ESDHC_VENDOR_SPEC_SDIO_QUIRK;
 578			writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
 579
 580			if (imx_data->multiblock_status == MULTIBLK_IN_PROCESS)
 581			{
 582				/* send a manual CMD12 with RESPTYP=none */
 583				data = MMC_STOP_TRANSMISSION << 24 |
 584				       SDHCI_CMD_ABORTCMD << 16;
 585				writel(data, host->ioaddr + SDHCI_TRANSFER_MODE);
 586				imx_data->multiblock_status = WAIT_FOR_INT;
 587			}
 588	}
 589
 590	writel(val, host->ioaddr + reg);
 591}
 592
 593static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
 594{
 595	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 596	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 597	u16 ret = 0;
 598	u32 val;
 599
 600	if (unlikely(reg == SDHCI_HOST_VERSION)) {
 601		reg ^= 2;
 602		if (esdhc_is_usdhc(imx_data)) {
 603			/*
 604			 * The usdhc register returns a wrong host version.
 605			 * Correct it here.
 606			 */
 607			return SDHCI_SPEC_300;
 608		}
 609	}
 610
 611	if (unlikely(reg == SDHCI_HOST_CONTROL2)) {
 612		val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 613		if (val & ESDHC_VENDOR_SPEC_VSELECT)
 614			ret |= SDHCI_CTRL_VDD_180;
 615
 616		if (esdhc_is_usdhc(imx_data)) {
 617			if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
 618				val = readl(host->ioaddr + ESDHC_MIX_CTRL);
 619			else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
 620				/* the std tuning bits is in ACMD12_ERR for imx6sl */
 621				val = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
 622		}
 623
 624		if (val & ESDHC_MIX_CTRL_EXE_TUNE)
 625			ret |= SDHCI_CTRL_EXEC_TUNING;
 626		if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
 627			ret |= SDHCI_CTRL_TUNED_CLK;
 628
 629		ret &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
 630
 631		return ret;
 632	}
 633
 634	if (unlikely(reg == SDHCI_TRANSFER_MODE)) {
 635		if (esdhc_is_usdhc(imx_data)) {
 636			u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
 637			ret = m & ESDHC_MIX_CTRL_SDHCI_MASK;
 638			/* Swap AC23 bit */
 639			if (m & ESDHC_MIX_CTRL_AC23EN) {
 640				ret &= ~ESDHC_MIX_CTRL_AC23EN;
 641				ret |= SDHCI_TRNS_AUTO_CMD23;
 642			}
 643		} else {
 644			ret = readw(host->ioaddr + SDHCI_TRANSFER_MODE);
 645		}
 646
 647		return ret;
 648	}
 649
 650	return readw(host->ioaddr + reg);
 651}
 652
 653static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
 654{
 655	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 656	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 657	u32 new_val = 0;
 658
 659	switch (reg) {
 660	case SDHCI_CLOCK_CONTROL:
 661		new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 662		if (val & SDHCI_CLOCK_CARD_EN)
 663			new_val |= ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
 664		else
 665			new_val &= ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
 666		writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
 667		if (!(new_val & ESDHC_VENDOR_SPEC_FRC_SDCLK_ON))
 668			esdhc_wait_for_card_clock_gate_off(host);
 669		return;
 670	case SDHCI_HOST_CONTROL2:
 671		new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 672		if (val & SDHCI_CTRL_VDD_180)
 673			new_val |= ESDHC_VENDOR_SPEC_VSELECT;
 674		else
 675			new_val &= ~ESDHC_VENDOR_SPEC_VSELECT;
 676		writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
 677		if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
 678			u32 v = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
 679			u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
 680			if (val & SDHCI_CTRL_TUNED_CLK) {
 681				v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
 682			} else {
 683				v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
 684				m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
 685				m &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
 686			}
 687
 688			if (val & SDHCI_CTRL_EXEC_TUNING) {
 689				v |= ESDHC_MIX_CTRL_EXE_TUNE;
 690				m |= ESDHC_MIX_CTRL_FBCLK_SEL;
 691				m |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
 692				usdhc_auto_tuning_mode_sel(host);
 693			} else {
 694				v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
 695			}
 696
 697			writel(v, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
 698			writel(m, host->ioaddr + ESDHC_MIX_CTRL);
 699		}
 700		return;
 701	case SDHCI_TRANSFER_MODE:
 702		if ((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
 
 
 
 
 703				&& (host->cmd->opcode == SD_IO_RW_EXTENDED)
 704				&& (host->cmd->data->blocks > 1)
 705				&& (host->cmd->data->flags & MMC_DATA_READ)) {
 706			u32 v;
 707			v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 708			v |= ESDHC_VENDOR_SPEC_SDIO_QUIRK;
 709			writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
 710		}
 711
 712		if (esdhc_is_usdhc(imx_data)) {
 713			u32 wml;
 714			u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
 715			/* Swap AC23 bit */
 716			if (val & SDHCI_TRNS_AUTO_CMD23) {
 717				val &= ~SDHCI_TRNS_AUTO_CMD23;
 718				val |= ESDHC_MIX_CTRL_AC23EN;
 719			}
 720			m = val | (m & ~ESDHC_MIX_CTRL_SDHCI_MASK);
 721			writel(m, host->ioaddr + ESDHC_MIX_CTRL);
 722
 723			/* Set watermark levels for PIO access to maximum value
 724			 * (128 words) to accommodate full 512 bytes buffer.
 725			 * For DMA access restore the levels to default value.
 726			 */
 727			m = readl(host->ioaddr + ESDHC_WTMK_LVL);
 728			if (val & SDHCI_TRNS_DMA) {
 729				wml = ESDHC_WTMK_LVL_WML_VAL_DEF;
 730			} else {
 731				u8 ctrl;
 732				wml = ESDHC_WTMK_LVL_WML_VAL_MAX;
 733
 734				/*
 735				 * Since already disable DMA mode, so also need
 736				 * to clear the DMASEL. Otherwise, for standard
 737				 * tuning, when send tuning command, usdhc will
 738				 * still prefetch the ADMA script from wrong
 739				 * DMA address, then we will see IOMMU report
 740				 * some error which show lack of TLB mapping.
 741				 */
 742				ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 743				ctrl &= ~SDHCI_CTRL_DMA_MASK;
 744				sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 745			}
 746			m &= ~(ESDHC_WTMK_LVL_RD_WML_MASK |
 747			       ESDHC_WTMK_LVL_WR_WML_MASK);
 748			m |= (wml << ESDHC_WTMK_LVL_RD_WML_SHIFT) |
 749			     (wml << ESDHC_WTMK_LVL_WR_WML_SHIFT);
 750			writel(m, host->ioaddr + ESDHC_WTMK_LVL);
 751		} else {
 752			/*
 753			 * Postpone this write, we must do it together with a
 754			 * command write that is down below.
 755			 */
 756			imx_data->scratchpad = val;
 757		}
 
 758		return;
 759	case SDHCI_COMMAND:
 760		if (host->cmd->opcode == MMC_STOP_TRANSMISSION)
 
 761			val |= SDHCI_CMD_ABORTCMD;
 762
 763		if ((host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
 764		    (imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
 765			imx_data->multiblock_status = MULTIBLK_IN_PROCESS;
 766
 767		if (esdhc_is_usdhc(imx_data))
 768			writel(val << 16,
 769			       host->ioaddr + SDHCI_TRANSFER_MODE);
 770		else
 771			writel(val << 16 | imx_data->scratchpad,
 772			       host->ioaddr + SDHCI_TRANSFER_MODE);
 773		return;
 774	case SDHCI_BLOCK_SIZE:
 775		val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
 776		break;
 777	}
 778	esdhc_clrset_le(host, 0xffff, val, reg);
 779}
 780
 781static u8 esdhc_readb_le(struct sdhci_host *host, int reg)
 782{
 783	u8 ret;
 784	u32 val;
 785
 786	switch (reg) {
 787	case SDHCI_HOST_CONTROL:
 788		val = readl(host->ioaddr + reg);
 789
 790		ret = val & SDHCI_CTRL_LED;
 791		ret |= (val >> 5) & SDHCI_CTRL_DMA_MASK;
 792		ret |= (val & ESDHC_CTRL_4BITBUS);
 793		ret |= (val & ESDHC_CTRL_8BITBUS) << 3;
 794		return ret;
 795	}
 796
 797	return readb(host->ioaddr + reg);
 798}
 799
 800static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
 801{
 802	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 803	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 804	u32 new_val = 0;
 805	u32 mask;
 806
 807	switch (reg) {
 808	case SDHCI_POWER_CONTROL:
 809		/*
 810		 * FSL put some DMA bits here
 811		 * If your board has a regulator, code should be here
 812		 */
 813		return;
 814	case SDHCI_HOST_CONTROL:
 815		/* FSL messed up here, so we need to manually compose it. */
 816		new_val = val & SDHCI_CTRL_LED;
 817		/* ensure the endianness */
 
 
 818		new_val |= ESDHC_HOST_CONTROL_LE;
 819		/* bits 8&9 are reserved on mx25 */
 820		if (!is_imx25_esdhc(imx_data)) {
 821			/* DMA mode bits are shifted */
 822			new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
 823		}
 824
 825		/*
 826		 * Do not touch buswidth bits here. This is done in
 827		 * esdhc_pltfm_bus_width.
 828		 * Do not touch the D3CD bit either which is used for the
 829		 * SDIO interrupt erratum workaround.
 830		 */
 831		mask = 0xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);
 832
 833		esdhc_clrset_le(host, mask, new_val, reg);
 834		return;
 835	case SDHCI_SOFTWARE_RESET:
 836		if (val & SDHCI_RESET_DATA)
 837			new_val = readl(host->ioaddr + SDHCI_HOST_CONTROL);
 838		break;
 839	}
 840	esdhc_clrset_le(host, 0xff, val, reg);
 841
 842	if (reg == SDHCI_SOFTWARE_RESET) {
 843		if (val & SDHCI_RESET_ALL) {
 844			/*
 845			 * The esdhc has a design violation to SDHC spec which
 846			 * tells that software reset should not affect card
 847			 * detection circuit. But esdhc clears its SYSCTL
 848			 * register bits [0..2] during the software reset. This
 849			 * will stop those clocks that card detection circuit
 850			 * relies on. To work around it, we turn the clocks on
 851			 * back to keep card detection circuit functional.
 852			 */
 853			esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
 854			/*
 855			 * The reset on usdhc fails to clear MIX_CTRL register.
 856			 * Do it manually here.
 857			 */
 858			if (esdhc_is_usdhc(imx_data)) {
 859				/*
 860				 * the tuning bits should be kept during reset
 861				 */
 862				new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
 863				writel(new_val & ESDHC_MIX_CTRL_TUNING_MASK,
 864						host->ioaddr + ESDHC_MIX_CTRL);
 865				imx_data->is_ddr = 0;
 866			}
 867		} else if (val & SDHCI_RESET_DATA) {
 868			/*
 869			 * The eSDHC DAT line software reset clears at least the
 870			 * data transfer width on i.MX25, so make sure that the
 871			 * Host Control register is unaffected.
 872			 */
 873			esdhc_clrset_le(host, 0xff, new_val,
 874					SDHCI_HOST_CONTROL);
 875		}
 876	}
 877}
 878
 879static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
 880{
 881	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 882
 883	return pltfm_host->clock;
 884}
 885
 886static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
 887{
 888	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 889
 890	return pltfm_host->clock / 256 / 16;
 891}
 892
 893static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
 894					 unsigned int clock)
 895{
 896	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 897	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 898	unsigned int host_clock = pltfm_host->clock;
 899	int ddr_pre_div = imx_data->is_ddr ? 2 : 1;
 900	int pre_div = 1;
 901	int div = 1;
 902	int ret;
 903	u32 temp, val;
 904
 905	if (esdhc_is_usdhc(imx_data)) {
 906		val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 907		writel(val & ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
 908			host->ioaddr + ESDHC_VENDOR_SPEC);
 909		esdhc_wait_for_card_clock_gate_off(host);
 910	}
 911
 912	if (clock == 0) {
 913		host->mmc->actual_clock = 0;
 914		return;
 915	}
 916
 917	/* For i.MX53 eSDHCv3, SYSCTL.SDCLKFS may not be set to 0. */
 918	if (is_imx53_esdhc(imx_data)) {
 919		/*
 920		 * According to the i.MX53 reference manual, if DLLCTRL[10] can
 921		 * be set, then the controller is eSDHCv3, else it is eSDHCv2.
 922		 */
 923		val = readl(host->ioaddr + ESDHC_DLL_CTRL);
 924		writel(val | BIT(10), host->ioaddr + ESDHC_DLL_CTRL);
 925		temp = readl(host->ioaddr + ESDHC_DLL_CTRL);
 926		writel(val, host->ioaddr + ESDHC_DLL_CTRL);
 927		if (temp & BIT(10))
 928			pre_div = 2;
 929	}
 930
 931	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
 932	temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
 933		| ESDHC_CLOCK_MASK);
 934	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
 935
 936	if (imx_data->socdata->flags & ESDHC_FLAG_ERR010450) {
 937		unsigned int max_clock;
 938
 939		max_clock = imx_data->is_ddr ? 45000000 : 150000000;
 940
 941		clock = min(clock, max_clock);
 942	}
 943
 944	while (host_clock / (16 * pre_div * ddr_pre_div) > clock &&
 945			pre_div < 256)
 946		pre_div *= 2;
 947
 948	while (host_clock / (div * pre_div * ddr_pre_div) > clock && div < 16)
 949		div++;
 950
 951	host->mmc->actual_clock = host_clock / (div * pre_div * ddr_pre_div);
 952	dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
 953		clock, host->mmc->actual_clock);
 954
 955	pre_div >>= 1;
 956	div--;
 957
 958	temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
 959	temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
 960		| (div << ESDHC_DIVIDER_SHIFT)
 961		| (pre_div << ESDHC_PREDIV_SHIFT));
 962	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
 963
 964	/* need to wait the bit 3 of the PRSSTAT to be set, make sure card clock is stable */
 965	ret = readl_poll_timeout(host->ioaddr + ESDHC_PRSSTAT, temp,
 966				(temp & ESDHC_CLOCK_STABLE), 2, 100);
 967	if (ret == -ETIMEDOUT)
 968		dev_warn(mmc_dev(host->mmc), "card clock still not stable in 100us!.\n");
 969
 970	if (esdhc_is_usdhc(imx_data)) {
 971		val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
 972		writel(val | ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
 973			host->ioaddr + ESDHC_VENDOR_SPEC);
 974	}
 975
 976}
 977
 978static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
 979{
 980	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 981	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 982	struct esdhc_platform_data *boarddata = &imx_data->boarddata;
 983
 984	switch (boarddata->wp_type) {
 985	case ESDHC_WP_GPIO:
 986		return mmc_gpio_get_ro(host->mmc);
 
 987	case ESDHC_WP_CONTROLLER:
 988		return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
 989			       SDHCI_WRITE_PROTECT);
 990	case ESDHC_WP_NONE:
 991		break;
 992	}
 993
 994	return -ENOSYS;
 995}
 996
 997static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
 998{
 999	u32 ctrl;
1000
1001	switch (width) {
1002	case MMC_BUS_WIDTH_8:
1003		ctrl = ESDHC_CTRL_8BITBUS;
1004		break;
1005	case MMC_BUS_WIDTH_4:
1006		ctrl = ESDHC_CTRL_4BITBUS;
1007		break;
1008	default:
1009		ctrl = 0;
1010		break;
1011	}
1012
1013	esdhc_clrset_le(host, ESDHC_CTRL_BUSWIDTH_MASK, ctrl,
1014			SDHCI_HOST_CONTROL);
1015}
1016
1017static void esdhc_reset_tuning(struct sdhci_host *host)
1018{
1019	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1020	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1021	u32 ctrl;
1022	int ret;
1023
1024	/* Reset the tuning circuit */
1025	if (esdhc_is_usdhc(imx_data)) {
1026		if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
1027			ctrl = readl(host->ioaddr + ESDHC_MIX_CTRL);
1028			ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
1029			ctrl &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
1030			writel(ctrl, host->ioaddr + ESDHC_MIX_CTRL);
1031			writel(0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
1032		} else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
1033			ctrl = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
1034			ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
1035			ctrl &= ~ESDHC_MIX_CTRL_EXE_TUNE;
1036			writel(ctrl, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
1037			/* Make sure ESDHC_MIX_CTRL_EXE_TUNE cleared */
1038			ret = readl_poll_timeout(host->ioaddr + SDHCI_AUTO_CMD_STATUS,
1039				ctrl, !(ctrl & ESDHC_MIX_CTRL_EXE_TUNE), 1, 50);
1040			if (ret == -ETIMEDOUT)
1041				dev_warn(mmc_dev(host->mmc),
1042				 "Warning! clear execute tuning bit failed\n");
1043			/*
1044			 * SDHCI_INT_DATA_AVAIL is W1C bit, set this bit will clear the
1045			 * usdhc IP internal logic flag execute_tuning_with_clr_buf, which
1046			 * will finally make sure the normal data transfer logic correct.
1047			 */
1048			ctrl = readl(host->ioaddr + SDHCI_INT_STATUS);
1049			ctrl |= SDHCI_INT_DATA_AVAIL;
1050			writel(ctrl, host->ioaddr + SDHCI_INT_STATUS);
1051		}
1052	}
1053}
1054
1055static int usdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
1056{
1057	struct sdhci_host *host = mmc_priv(mmc);
1058
1059	/*
1060	 * i.MX uSDHC internally already uses a fixed optimized timing for
1061	 * DDR50, normally does not require tuning for DDR50 mode.
1062	 */
1063	if (host->timing == MMC_TIMING_UHS_DDR50)
1064		return 0;
1065
1066	/*
1067	 * Reset tuning circuit logic. If not, the previous tuning result
1068	 * will impact current tuning, make current tuning can't set the
1069	 * correct delay cell.
1070	 */
1071	esdhc_reset_tuning(host);
1072	return sdhci_execute_tuning(mmc, opcode);
1073}
1074
1075static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
1076{
1077	u32 reg;
1078	u8 sw_rst;
1079	int ret;
1080
1081	/* FIXME: delay a bit for card to be ready for next tuning due to errors */
1082	mdelay(1);
1083
1084	/* IC suggest to reset USDHC before every tuning command */
1085	esdhc_clrset_le(host, 0xff, SDHCI_RESET_ALL, SDHCI_SOFTWARE_RESET);
1086	ret = readb_poll_timeout(host->ioaddr + SDHCI_SOFTWARE_RESET, sw_rst,
1087				!(sw_rst & SDHCI_RESET_ALL), 10, 100);
1088	if (ret == -ETIMEDOUT)
1089		dev_warn(mmc_dev(host->mmc),
1090		"warning! RESET_ALL never complete before sending tuning command\n");
1091
1092	reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
1093	reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL |
1094			ESDHC_MIX_CTRL_FBCLK_SEL;
1095	writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
1096	writel(val << 8, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
1097	dev_dbg(mmc_dev(host->mmc),
1098		"tuning with delay 0x%x ESDHC_TUNE_CTRL_STATUS 0x%x\n",
1099			val, readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS));
1100}
1101
1102static void esdhc_post_tuning(struct sdhci_host *host)
1103{
1104	u32 reg;
1105
1106	usdhc_auto_tuning_mode_sel(host);
1107
1108	reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
1109	reg &= ~ESDHC_MIX_CTRL_EXE_TUNE;
1110	reg |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
1111	writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
1112}
1113
1114static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
1115{
1116	int min, max, avg, ret;
1117
1118	/* find the mininum delay first which can pass tuning */
1119	min = ESDHC_TUNE_CTRL_MIN;
1120	while (min < ESDHC_TUNE_CTRL_MAX) {
1121		esdhc_prepare_tuning(host, min);
1122		if (!mmc_send_tuning(host->mmc, opcode, NULL))
1123			break;
1124		min += ESDHC_TUNE_CTRL_STEP;
1125	}
1126
1127	/* find the maxinum delay which can not pass tuning */
1128	max = min + ESDHC_TUNE_CTRL_STEP;
1129	while (max < ESDHC_TUNE_CTRL_MAX) {
1130		esdhc_prepare_tuning(host, max);
1131		if (mmc_send_tuning(host->mmc, opcode, NULL)) {
1132			max -= ESDHC_TUNE_CTRL_STEP;
1133			break;
1134		}
1135		max += ESDHC_TUNE_CTRL_STEP;
1136	}
1137
1138	/* use average delay to get the best timing */
1139	avg = (min + max) / 2;
1140	esdhc_prepare_tuning(host, avg);
1141	ret = mmc_send_tuning(host->mmc, opcode, NULL);
1142	esdhc_post_tuning(host);
1143
1144	dev_dbg(mmc_dev(host->mmc), "tuning %s at 0x%x ret %d\n",
1145		ret ? "failed" : "passed", avg, ret);
1146
1147	return ret;
1148}
1149
1150static void esdhc_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios)
1151{
1152	struct sdhci_host *host = mmc_priv(mmc);
1153	u32 m;
1154
1155	m = readl(host->ioaddr + ESDHC_MIX_CTRL);
1156	if (ios->enhanced_strobe)
1157		m |= ESDHC_MIX_CTRL_HS400_ES_EN;
1158	else
1159		m &= ~ESDHC_MIX_CTRL_HS400_ES_EN;
1160	writel(m, host->ioaddr + ESDHC_MIX_CTRL);
1161}
1162
1163static int esdhc_change_pinstate(struct sdhci_host *host,
1164						unsigned int uhs)
1165{
1166	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1167	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1168	struct pinctrl_state *pinctrl;
1169
1170	dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
1171
1172	if (IS_ERR(imx_data->pinctrl) ||
1173		IS_ERR(imx_data->pins_100mhz) ||
1174		IS_ERR(imx_data->pins_200mhz))
1175		return -EINVAL;
1176
1177	switch (uhs) {
1178	case MMC_TIMING_UHS_SDR50:
1179	case MMC_TIMING_UHS_DDR50:
1180		pinctrl = imx_data->pins_100mhz;
1181		break;
1182	case MMC_TIMING_UHS_SDR104:
1183	case MMC_TIMING_MMC_HS200:
1184	case MMC_TIMING_MMC_HS400:
1185		pinctrl = imx_data->pins_200mhz;
1186		break;
1187	default:
1188		/* back to default state for other legacy timing */
1189		return pinctrl_select_default_state(mmc_dev(host->mmc));
1190	}
1191
1192	return pinctrl_select_state(imx_data->pinctrl, pinctrl);
1193}
1194
1195/*
1196 * For HS400 eMMC, there is a data_strobe line. This signal is generated
1197 * by the device and used for data output and CRC status response output
1198 * in HS400 mode. The frequency of this signal follows the frequency of
1199 * CLK generated by host. The host receives the data which is aligned to the
1200 * edge of data_strobe line. Due to the time delay between CLK line and
1201 * data_strobe line, if the delay time is larger than one clock cycle,
1202 * then CLK and data_strobe line will be misaligned, read error shows up.
1203 */
1204static void esdhc_set_strobe_dll(struct sdhci_host *host)
1205{
1206	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1207	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1208	u32 strobe_delay;
1209	u32 v;
1210	int ret;
1211
1212	/* disable clock before enabling strobe dll */
1213	writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
1214		~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
1215		host->ioaddr + ESDHC_VENDOR_SPEC);
1216	esdhc_wait_for_card_clock_gate_off(host);
1217
1218	/* force a reset on strobe dll */
1219	writel(ESDHC_STROBE_DLL_CTRL_RESET,
1220		host->ioaddr + ESDHC_STROBE_DLL_CTRL);
1221	/* clear the reset bit on strobe dll before any setting */
1222	writel(0, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
1223
1224	/*
1225	 * enable strobe dll ctrl and adjust the delay target
1226	 * for the uSDHC loopback read clock
1227	 */
1228	if (imx_data->boarddata.strobe_dll_delay_target)
1229		strobe_delay = imx_data->boarddata.strobe_dll_delay_target;
1230	else
1231		strobe_delay = ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT;
1232	v = ESDHC_STROBE_DLL_CTRL_ENABLE |
1233		ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT |
1234		(strobe_delay << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
1235	writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
1236
1237	/* wait max 50us to get the REF/SLV lock */
1238	ret = readl_poll_timeout(host->ioaddr + ESDHC_STROBE_DLL_STATUS, v,
1239		((v & ESDHC_STROBE_DLL_STS_REF_LOCK) && (v & ESDHC_STROBE_DLL_STS_SLV_LOCK)), 1, 50);
1240	if (ret == -ETIMEDOUT)
1241		dev_warn(mmc_dev(host->mmc),
1242		"warning! HS400 strobe DLL status REF/SLV not lock in 50us, STROBE DLL status is %x!\n", v);
1243}
1244
1245static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1246{
1247	u32 m;
1248	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1249	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1250	struct esdhc_platform_data *boarddata = &imx_data->boarddata;
1251
1252	/* disable ddr mode and disable HS400 mode */
1253	m = readl(host->ioaddr + ESDHC_MIX_CTRL);
1254	m &= ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN);
1255	imx_data->is_ddr = 0;
1256
1257	switch (timing) {
1258	case MMC_TIMING_UHS_SDR12:
1259	case MMC_TIMING_UHS_SDR25:
1260	case MMC_TIMING_UHS_SDR50:
1261	case MMC_TIMING_UHS_SDR104:
1262	case MMC_TIMING_MMC_HS:
1263	case MMC_TIMING_MMC_HS200:
1264		writel(m, host->ioaddr + ESDHC_MIX_CTRL);
1265		break;
1266	case MMC_TIMING_UHS_DDR50:
1267	case MMC_TIMING_MMC_DDR52:
1268		m |= ESDHC_MIX_CTRL_DDREN;
1269		writel(m, host->ioaddr + ESDHC_MIX_CTRL);
1270		imx_data->is_ddr = 1;
1271		if (boarddata->delay_line) {
1272			u32 v;
1273			v = boarddata->delay_line <<
1274				ESDHC_DLL_OVERRIDE_VAL_SHIFT |
1275				(1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
1276			if (is_imx53_esdhc(imx_data))
1277				v <<= 1;
1278			writel(v, host->ioaddr + ESDHC_DLL_CTRL);
1279		}
1280		break;
1281	case MMC_TIMING_MMC_HS400:
1282		m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
1283		writel(m, host->ioaddr + ESDHC_MIX_CTRL);
1284		imx_data->is_ddr = 1;
1285		/* update clock after enable DDR for strobe DLL lock */
1286		host->ops->set_clock(host, host->clock);
1287		esdhc_set_strobe_dll(host);
1288		break;
1289	case MMC_TIMING_LEGACY:
1290	default:
1291		esdhc_reset_tuning(host);
1292		break;
1293	}
1294
1295	esdhc_change_pinstate(host, timing);
1296}
1297
1298static void esdhc_reset(struct sdhci_host *host, u8 mask)
1299{
1300	sdhci_and_cqhci_reset(host, mask);
1301
1302	sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1303	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1304}
1305
1306static unsigned int esdhc_get_max_timeout_count(struct sdhci_host *host)
1307{
1308	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1309	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1310
1311	/* Doc Erratum: the uSDHC actual maximum timeout count is 1 << 29 */
1312	return esdhc_is_usdhc(imx_data) ? 1 << 29 : 1 << 27;
1313}
1314
1315static void esdhc_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1316{
1317	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1318	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1319
1320	/* use maximum timeout counter */
1321	esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
1322			esdhc_is_usdhc(imx_data) ? 0xF : 0xE,
1323			SDHCI_TIMEOUT_CONTROL);
1324}
1325
1326static u32 esdhc_cqhci_irq(struct sdhci_host *host, u32 intmask)
1327{
1328	int cmd_error = 0;
1329	int data_error = 0;
1330
1331	if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
1332		return intmask;
1333
1334	cqhci_irq(host->mmc, intmask, cmd_error, data_error);
1335
1336	return 0;
1337}
1338
1339static struct sdhci_ops sdhci_esdhc_ops = {
1340	.read_l = esdhc_readl_le,
1341	.read_w = esdhc_readw_le,
1342	.read_b = esdhc_readb_le,
1343	.write_l = esdhc_writel_le,
1344	.write_w = esdhc_writew_le,
1345	.write_b = esdhc_writeb_le,
1346	.set_clock = esdhc_pltfm_set_clock,
1347	.get_max_clock = esdhc_pltfm_get_max_clock,
1348	.get_min_clock = esdhc_pltfm_get_min_clock,
1349	.get_max_timeout_count = esdhc_get_max_timeout_count,
1350	.get_ro = esdhc_pltfm_get_ro,
1351	.set_timeout = esdhc_set_timeout,
1352	.set_bus_width = esdhc_pltfm_set_bus_width,
1353	.set_uhs_signaling = esdhc_set_uhs_signaling,
1354	.reset = esdhc_reset,
1355	.irq = esdhc_cqhci_irq,
1356	.dump_vendor_regs = esdhc_dump_debug_regs,
1357};
1358
1359static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
1360	.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
1361			| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
1362			| SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
1363			| SDHCI_QUIRK_BROKEN_CARD_DETECTION,
 
1364	.ops = &sdhci_esdhc_ops,
1365};
1366
1367static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
1368{
1369	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1370	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1371	struct cqhci_host *cq_host = host->mmc->cqe_private;
1372	u32 tmp;
1373
1374	if (esdhc_is_usdhc(imx_data)) {
1375		/*
1376		 * The imx6q ROM code will change the default watermark
1377		 * level setting to something insane.  Change it back here.
1378		 */
1379		writel(ESDHC_WTMK_DEFAULT_VAL, host->ioaddr + ESDHC_WTMK_LVL);
1380
1381		/*
1382		 * ROM code will change the bit burst_length_enable setting
1383		 * to zero if this usdhc is chosen to boot system. Change
1384		 * it back here, otherwise it will impact the performance a
1385		 * lot. This bit is used to enable/disable the burst length
1386		 * for the external AHB2AXI bridge. It's useful especially
1387		 * for INCR transfer because without burst length indicator,
1388		 * the AHB2AXI bridge does not know the burst length in
1389		 * advance. And without burst length indicator, AHB INCR
1390		 * transfer can only be converted to singles on the AXI side.
1391		 */
1392		writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
1393			| ESDHC_BURST_LEN_EN_INCR,
1394			host->ioaddr + SDHCI_HOST_CONTROL);
1395
1396		/*
1397		 * erratum ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
1398		 * TO1.1, it's harmless for MX6SL
1399		 */
1400		if (!(imx_data->socdata->flags & ESDHC_FLAG_SKIP_ERR004536)) {
1401			writel(readl(host->ioaddr + 0x6c) & ~BIT(7),
1402				host->ioaddr + 0x6c);
1403		}
1404
1405		/* disable DLL_CTRL delay line settings */
1406		writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
1407
1408		/*
1409		 * For the case of command with busy, if set the bit
1410		 * ESDHC_VEND_SPEC2_EN_BUSY_IRQ, USDHC will generate a
1411		 * transfer complete interrupt when busy is deasserted.
1412		 * When CQHCI use DCMD to send a CMD need R1b respons,
1413		 * CQHCI require to set ESDHC_VEND_SPEC2_EN_BUSY_IRQ,
1414		 * otherwise DCMD will always meet timeout waiting for
1415		 * hardware interrupt issue.
1416		 */
1417		if (imx_data->socdata->flags & ESDHC_FLAG_CQHCI) {
1418			tmp = readl(host->ioaddr + ESDHC_VEND_SPEC2);
1419			tmp |= ESDHC_VEND_SPEC2_EN_BUSY_IRQ;
1420			writel(tmp, host->ioaddr + ESDHC_VEND_SPEC2);
1421
1422			host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
1423		}
1424
1425		if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
1426			tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
1427			tmp |= ESDHC_STD_TUNING_EN;
1428
1429			/*
1430			 * ROM code or bootloader may config the start tap
1431			 * and step, unmask them first.
1432			 */
1433			tmp &= ~(ESDHC_TUNING_START_TAP_MASK | ESDHC_TUNING_STEP_MASK);
1434			if (imx_data->boarddata.tuning_start_tap)
1435				tmp |= imx_data->boarddata.tuning_start_tap;
1436			else
1437				tmp |= ESDHC_TUNING_START_TAP_DEFAULT;
1438
1439			if (imx_data->boarddata.tuning_step) {
1440				tmp |= imx_data->boarddata.tuning_step
1441					<< ESDHC_TUNING_STEP_SHIFT;
1442			} else {
1443				tmp |= ESDHC_TUNING_STEP_DEFAULT
1444					<< ESDHC_TUNING_STEP_SHIFT;
1445			}
1446
1447			/* Disable the CMD CRC check for tuning, if not, need to
1448			 * add some delay after every tuning command, because
1449			 * hardware standard tuning logic will directly go to next
1450			 * step once it detect the CMD CRC error, will not wait for
1451			 * the card side to finally send out the tuning data, trigger
1452			 * the buffer read ready interrupt immediately. If usdhc send
1453			 * the next tuning command some eMMC card will stuck, can't
1454			 * response, block the tuning procedure or the first command
1455			 * after the whole tuning procedure always can't get any response.
1456			 */
1457			tmp |= ESDHC_TUNING_CMD_CRC_CHECK_DISABLE;
1458			writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
1459		} else if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
1460			/*
1461			 * ESDHC_STD_TUNING_EN may be configed in bootloader
1462			 * or ROM code, so clear this bit here to make sure
1463			 * the manual tuning can work.
1464			 */
1465			tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
1466			tmp &= ~ESDHC_STD_TUNING_EN;
1467			writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
1468		}
1469
1470		/*
1471		 * On i.MX8MM, we are running Dual Linux OS, with 1st Linux using SD Card
1472		 * as rootfs storage, 2nd Linux using eMMC as rootfs storage. We let
1473		 * the 1st linux configure power/clock for the 2nd Linux.
1474		 *
1475		 * When the 2nd Linux is booting into rootfs stage, we let the 1st Linux
1476		 * to destroy the 2nd linux, then restart the 2nd linux, we met SDHCI dump.
1477		 * After we clear the pending interrupt and halt CQCTL, issue gone.
1478		 */
1479		if (cq_host) {
1480			tmp = cqhci_readl(cq_host, CQHCI_IS);
1481			cqhci_writel(cq_host, tmp, CQHCI_IS);
1482			cqhci_writel(cq_host, CQHCI_HALT, CQHCI_CTL);
1483		}
1484	}
1485}
1486
1487static void esdhc_cqe_enable(struct mmc_host *mmc)
1488{
1489	struct sdhci_host *host = mmc_priv(mmc);
1490	struct cqhci_host *cq_host = mmc->cqe_private;
1491	u32 reg;
1492	u16 mode;
1493	int count = 10;
1494
1495	/*
1496	 * CQE gets stuck if it sees Buffer Read Enable bit set, which can be
1497	 * the case after tuning, so ensure the buffer is drained.
1498	 */
1499	reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
1500	while (reg & SDHCI_DATA_AVAILABLE) {
1501		sdhci_readl(host, SDHCI_BUFFER);
1502		reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
1503		if (count-- == 0) {
1504			dev_warn(mmc_dev(host->mmc),
1505				"CQE may get stuck because the Buffer Read Enable bit is set\n");
1506			break;
1507		}
1508		mdelay(1);
1509	}
1510
1511	/*
1512	 * Runtime resume will reset the entire host controller, which
1513	 * will also clear the DMAEN/BCEN of register ESDHC_MIX_CTRL.
1514	 * Here set DMAEN and BCEN when enable CMDQ.
1515	 */
1516	mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
1517	if (host->flags & SDHCI_REQ_USE_DMA)
1518		mode |= SDHCI_TRNS_DMA;
1519	if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
1520		mode |= SDHCI_TRNS_BLK_CNT_EN;
1521	sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
1522
1523	/*
1524	 * Though Runtime resume reset the entire host controller,
1525	 * but do not impact the CQHCI side, need to clear the
1526	 * HALT bit, avoid CQHCI stuck in the first request when
1527	 * system resume back.
1528	 */
1529	cqhci_writel(cq_host, 0, CQHCI_CTL);
1530	if (cqhci_readl(cq_host, CQHCI_CTL) & CQHCI_HALT)
1531		dev_err(mmc_dev(host->mmc),
1532			"failed to exit halt state when enable CQE\n");
1533
1534
1535	sdhci_cqe_enable(mmc);
1536}
1537
1538static void esdhc_sdhci_dumpregs(struct mmc_host *mmc)
1539{
1540	sdhci_dumpregs(mmc_priv(mmc));
1541}
1542
1543static const struct cqhci_host_ops esdhc_cqhci_ops = {
1544	.enable		= esdhc_cqe_enable,
1545	.disable	= sdhci_cqe_disable,
1546	.dumpregs	= esdhc_sdhci_dumpregs,
1547};
1548
1549static int
 
1550sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
1551			 struct sdhci_host *host,
1552			 struct pltfm_imx_data *imx_data)
1553{
1554	struct device_node *np = pdev->dev.of_node;
1555	struct esdhc_platform_data *boarddata = &imx_data->boarddata;
1556	int ret;
1557
1558	if (of_get_property(np, "fsl,wp-controller", NULL))
1559		boarddata->wp_type = ESDHC_WP_CONTROLLER;
1560
1561	/*
1562	 * If we have this property, then activate WP check.
1563	 * Retrieveing and requesting the actual WP GPIO will happen
1564	 * in the call to mmc_of_parse().
1565	 */
1566	if (of_property_read_bool(np, "wp-gpios"))
1567		boarddata->wp_type = ESDHC_WP_GPIO;
1568
1569	of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
1570	of_property_read_u32(np, "fsl,tuning-start-tap",
1571			     &boarddata->tuning_start_tap);
1572
1573	of_property_read_u32(np, "fsl,strobe-dll-delay-target",
1574				&boarddata->strobe_dll_delay_target);
1575	if (of_find_property(np, "no-1-8-v", NULL))
1576		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
1577
1578	if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
1579		boarddata->delay_line = 0;
1580
1581	mmc_of_parse_voltage(host->mmc, &host->ocr_mask);
1582
1583	if (esdhc_is_usdhc(imx_data) && !IS_ERR(imx_data->pinctrl)) {
1584		imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
1585						ESDHC_PINCTRL_STATE_100MHZ);
1586		imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
1587						ESDHC_PINCTRL_STATE_200MHZ);
1588	}
1589
1590	/* call to generic mmc_of_parse to support additional capabilities */
1591	ret = mmc_of_parse(host->mmc);
1592	if (ret)
1593		return ret;
1594
1595	if (mmc_gpio_get_cd(host->mmc) >= 0)
1596		host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 
 
 
 
 
1597
1598	return 0;
1599}
 
 
 
 
 
 
 
 
1600
1601static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
1602{
 
 
1603	struct sdhci_pltfm_host *pltfm_host;
1604	struct sdhci_host *host;
1605	struct cqhci_host *cq_host;
 
1606	int err;
1607	struct pltfm_imx_data *imx_data;
1608
1609	host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata,
1610				sizeof(*imx_data));
1611	if (IS_ERR(host))
1612		return PTR_ERR(host);
1613
1614	pltfm_host = sdhci_priv(host);
1615
1616	imx_data = sdhci_pltfm_priv(pltfm_host);
1617
1618	imx_data->socdata = device_get_match_data(&pdev->dev);
1619
1620	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1621		cpu_latency_qos_add_request(&imx_data->pm_qos_req, 0);
1622
1623	imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1624	if (IS_ERR(imx_data->clk_ipg)) {
1625		err = PTR_ERR(imx_data->clk_ipg);
1626		goto free_sdhci;
1627	}
1628
1629	imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1630	if (IS_ERR(imx_data->clk_ahb)) {
1631		err = PTR_ERR(imx_data->clk_ahb);
1632		goto free_sdhci;
1633	}
1634
1635	imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
1636	if (IS_ERR(imx_data->clk_per)) {
1637		err = PTR_ERR(imx_data->clk_per);
1638		goto free_sdhci;
1639	}
1640
1641	pltfm_host->clk = imx_data->clk_per;
1642	pltfm_host->clock = clk_get_rate(pltfm_host->clk);
1643	err = clk_prepare_enable(imx_data->clk_per);
1644	if (err)
1645		goto free_sdhci;
1646	err = clk_prepare_enable(imx_data->clk_ipg);
1647	if (err)
1648		goto disable_per_clk;
1649	err = clk_prepare_enable(imx_data->clk_ahb);
1650	if (err)
1651		goto disable_ipg_clk;
1652
1653	imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
1654	if (IS_ERR(imx_data->pinctrl))
1655		dev_warn(mmc_dev(host->mmc), "could not get pinctrl\n");
1656
1657	if (esdhc_is_usdhc(imx_data)) {
1658		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
1659		host->mmc->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR;
1660
1661		/* GPIO CD can be set as a wakeup source */
1662		host->mmc->caps |= MMC_CAP_CD_WAKE;
1663
1664		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
1665			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
1666
1667		/* clear tuning bits in case ROM has set it already */
1668		writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
1669		writel(0x0, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
1670		writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
1671
1672		/*
1673		 * Link usdhc specific mmc_host_ops execute_tuning function,
1674		 * to replace the standard one in sdhci_ops.
1675		 */
1676		host->mmc_host_ops.execute_tuning = usdhc_execute_tuning;
1677	}
1678
1679	err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
1680	if (err)
1681		goto disable_ahb_clk;
1682
1683	if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
1684		sdhci_esdhc_ops.platform_execute_tuning =
1685					esdhc_executing_tuning;
1686
1687	if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)
1688		host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
1689
1690	if (host->mmc->caps & MMC_CAP_8_BIT_DATA &&
1691	    imx_data->socdata->flags & ESDHC_FLAG_HS400)
1692		host->mmc->caps2 |= MMC_CAP2_HS400;
1693
1694	if (imx_data->socdata->flags & ESDHC_FLAG_BROKEN_AUTO_CMD23)
1695		host->quirks2 |= SDHCI_QUIRK2_ACMD23_BROKEN;
1696
1697	if (host->mmc->caps & MMC_CAP_8_BIT_DATA &&
1698	    imx_data->socdata->flags & ESDHC_FLAG_HS400_ES) {
1699		host->mmc->caps2 |= MMC_CAP2_HS400_ES;
1700		host->mmc_host_ops.hs400_enhanced_strobe =
1701					esdhc_hs400_enhanced_strobe;
1702	}
1703
1704	if (imx_data->socdata->flags & ESDHC_FLAG_CQHCI) {
1705		host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
1706		cq_host = devm_kzalloc(&pdev->dev, sizeof(*cq_host), GFP_KERNEL);
1707		if (!cq_host) {
1708			err = -ENOMEM;
1709			goto disable_ahb_clk;
1710		}
 
1711
1712		cq_host->mmio = host->ioaddr + ESDHC_CQHCI_ADDR_OFFSET;
1713		cq_host->ops = &esdhc_cqhci_ops;
 
 
1714
1715		err = cqhci_init(cq_host, host->mmc, false);
1716		if (err)
1717			goto disable_ahb_clk;
1718	}
1719
1720	sdhci_esdhc_imx_hwinit(host);
 
 
1721
1722	err = sdhci_add_host(host);
1723	if (err)
1724		goto disable_ahb_clk;
1725
1726	/*
1727	 * Setup the wakeup capability here, let user to decide
1728	 * whether need to enable this wakeup through sysfs interface.
1729	 */
1730	if ((host->mmc->pm_caps & MMC_PM_KEEP_POWER) &&
1731			(host->mmc->pm_caps & MMC_PM_WAKE_SDIO_IRQ))
1732		device_set_wakeup_capable(&pdev->dev, true);
1733
1734	pm_runtime_set_active(&pdev->dev);
1735	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1736	pm_runtime_use_autosuspend(&pdev->dev);
1737	pm_suspend_ignore_children(&pdev->dev, 1);
1738	pm_runtime_enable(&pdev->dev);
1739
1740	return 0;
1741
1742disable_ahb_clk:
1743	clk_disable_unprepare(imx_data->clk_ahb);
1744disable_ipg_clk:
1745	clk_disable_unprepare(imx_data->clk_ipg);
1746disable_per_clk:
1747	clk_disable_unprepare(imx_data->clk_per);
1748free_sdhci:
1749	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1750		cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
 
 
 
 
 
 
1751	sdhci_pltfm_free(pdev);
1752	return err;
1753}
1754
1755static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
1756{
1757	struct sdhci_host *host = platform_get_drvdata(pdev);
1758	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1759	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1760	int dead;
1761
1762	pm_runtime_get_sync(&pdev->dev);
1763	dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
1764	pm_runtime_disable(&pdev->dev);
1765	pm_runtime_put_noidle(&pdev->dev);
1766
1767	sdhci_remove_host(host, dead);
1768
1769	clk_disable_unprepare(imx_data->clk_per);
1770	clk_disable_unprepare(imx_data->clk_ipg);
1771	clk_disable_unprepare(imx_data->clk_ahb);
1772
1773	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1774		cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
1775
1776	sdhci_pltfm_free(pdev);
1777
1778	return 0;
1779}
1780
1781#ifdef CONFIG_PM_SLEEP
1782static int sdhci_esdhc_suspend(struct device *dev)
1783{
1784	struct sdhci_host *host = dev_get_drvdata(dev);
1785	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1786	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1787	int ret;
1788
1789	if (host->mmc->caps2 & MMC_CAP2_CQE) {
1790		ret = cqhci_suspend(host->mmc);
1791		if (ret)
1792			return ret;
1793	}
1794
1795	if ((imx_data->socdata->flags & ESDHC_FLAG_STATE_LOST_IN_LPMODE) &&
1796		(host->tuning_mode != SDHCI_TUNING_MODE_1)) {
1797		mmc_retune_timer_stop(host->mmc);
1798		mmc_retune_needed(host->mmc);
1799	}
1800
1801	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
1802		mmc_retune_needed(host->mmc);
1803
1804	ret = sdhci_suspend_host(host);
1805	if (ret)
1806		return ret;
1807
1808	ret = pinctrl_pm_select_sleep_state(dev);
1809	if (ret)
1810		return ret;
1811
1812	ret = mmc_gpio_set_cd_wake(host->mmc, true);
1813
1814	return ret;
1815}
1816
1817static int sdhci_esdhc_resume(struct device *dev)
1818{
1819	struct sdhci_host *host = dev_get_drvdata(dev);
1820	int ret;
1821
1822	ret = pinctrl_pm_select_default_state(dev);
1823	if (ret)
1824		return ret;
1825
1826	/* re-initialize hw state in case it's lost in low power mode */
1827	sdhci_esdhc_imx_hwinit(host);
1828
1829	ret = sdhci_resume_host(host);
1830	if (ret)
1831		return ret;
1832
1833	if (host->mmc->caps2 & MMC_CAP2_CQE)
1834		ret = cqhci_resume(host->mmc);
1835
1836	if (!ret)
1837		ret = mmc_gpio_set_cd_wake(host->mmc, false);
1838
1839	return ret;
1840}
1841#endif
1842
1843#ifdef CONFIG_PM
1844static int sdhci_esdhc_runtime_suspend(struct device *dev)
1845{
1846	struct sdhci_host *host = dev_get_drvdata(dev);
1847	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1848	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1849	int ret;
1850
1851	if (host->mmc->caps2 & MMC_CAP2_CQE) {
1852		ret = cqhci_suspend(host->mmc);
1853		if (ret)
1854			return ret;
1855	}
1856
1857	ret = sdhci_runtime_suspend_host(host);
1858	if (ret)
1859		return ret;
1860
1861	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
1862		mmc_retune_needed(host->mmc);
1863
1864	imx_data->actual_clock = host->mmc->actual_clock;
1865	esdhc_pltfm_set_clock(host, 0);
1866	clk_disable_unprepare(imx_data->clk_per);
1867	clk_disable_unprepare(imx_data->clk_ipg);
1868	clk_disable_unprepare(imx_data->clk_ahb);
1869
1870	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1871		cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
1872
1873	return ret;
1874}
1875
1876static int sdhci_esdhc_runtime_resume(struct device *dev)
1877{
1878	struct sdhci_host *host = dev_get_drvdata(dev);
1879	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
1880	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
1881	int err;
1882
1883	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1884		cpu_latency_qos_add_request(&imx_data->pm_qos_req, 0);
1885
1886	if (imx_data->socdata->flags & ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME)
1887		clk_set_rate(imx_data->clk_per, pltfm_host->clock);
1888
1889	err = clk_prepare_enable(imx_data->clk_ahb);
1890	if (err)
1891		goto remove_pm_qos_request;
1892
1893	err = clk_prepare_enable(imx_data->clk_per);
1894	if (err)
1895		goto disable_ahb_clk;
1896
1897	err = clk_prepare_enable(imx_data->clk_ipg);
1898	if (err)
1899		goto disable_per_clk;
1900
1901	esdhc_pltfm_set_clock(host, imx_data->actual_clock);
1902
1903	err = sdhci_runtime_resume_host(host, 0);
1904	if (err)
1905		goto disable_ipg_clk;
1906
1907	if (host->mmc->caps2 & MMC_CAP2_CQE)
1908		err = cqhci_resume(host->mmc);
1909
1910	return err;
1911
1912disable_ipg_clk:
1913	clk_disable_unprepare(imx_data->clk_ipg);
1914disable_per_clk:
1915	clk_disable_unprepare(imx_data->clk_per);
1916disable_ahb_clk:
1917	clk_disable_unprepare(imx_data->clk_ahb);
1918remove_pm_qos_request:
1919	if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
1920		cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
1921	return err;
1922}
1923#endif
1924
1925static const struct dev_pm_ops sdhci_esdhc_pmops = {
1926	SET_SYSTEM_SLEEP_PM_OPS(sdhci_esdhc_suspend, sdhci_esdhc_resume)
1927	SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,
1928				sdhci_esdhc_runtime_resume, NULL)
1929};
1930
1931static struct platform_driver sdhci_esdhc_imx_driver = {
1932	.driver		= {
1933		.name	= "sdhci-esdhc-imx",
1934		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1935		.of_match_table = imx_esdhc_dt_ids,
1936		.pm	= &sdhci_esdhc_pmops,
1937	},
 
1938	.probe		= sdhci_esdhc_imx_probe,
1939	.remove		= sdhci_esdhc_imx_remove,
 
 
 
 
1940};
1941
1942module_platform_driver(sdhci_esdhc_imx_driver);
 
 
 
 
 
 
 
 
 
 
1943
1944MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
1945MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
1946MODULE_LICENSE("GPL v2");