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OpenCloudOS-Kernel/drivers/mmc/host/sdhci-esdhc-imx.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Freescale eSDHC i.MX controller driver for the platform bus.
*
* derived from the OF-version.
*
* Copyright (c) 2010 Pengutronix e.K.
* Author: Wolfram Sang <kernel@pengutronix.de>
*/
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pm_qos.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/mmc-esdhc-imx.h>
#include <linux/pm_runtime.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
#include "cqhci.h"
#define ESDHC_SYS_CTRL_DTOCV_MASK 0x0f
#define ESDHC_CTRL_D3CD 0x08
#define ESDHC_BURST_LEN_EN_INCR (1 << 27)
/* VENDOR SPEC register */
#define ESDHC_VENDOR_SPEC 0xc0
#define ESDHC_VENDOR_SPEC_SDIO_QUIRK (1 << 1)
#define ESDHC_VENDOR_SPEC_VSELECT (1 << 1)
#define ESDHC_VENDOR_SPEC_FRC_SDCLK_ON (1 << 8)
#define ESDHC_WTMK_LVL 0x44
#define ESDHC_WTMK_DEFAULT_VAL 0x10401040
#define ESDHC_WTMK_LVL_RD_WML_MASK 0x000000FF
#define ESDHC_WTMK_LVL_RD_WML_SHIFT 0
#define ESDHC_WTMK_LVL_WR_WML_MASK 0x00FF0000
#define ESDHC_WTMK_LVL_WR_WML_SHIFT 16
#define ESDHC_WTMK_LVL_WML_VAL_DEF 64
#define ESDHC_WTMK_LVL_WML_VAL_MAX 128
#define ESDHC_MIX_CTRL 0x48
#define ESDHC_MIX_CTRL_DDREN (1 << 3)
#define ESDHC_MIX_CTRL_AC23EN (1 << 7)
#define ESDHC_MIX_CTRL_EXE_TUNE (1 << 22)
#define ESDHC_MIX_CTRL_SMPCLK_SEL (1 << 23)
#define ESDHC_MIX_CTRL_AUTO_TUNE_EN (1 << 24)
#define ESDHC_MIX_CTRL_FBCLK_SEL (1 << 25)
#define ESDHC_MIX_CTRL_HS400_EN (1 << 26)
#define ESDHC_MIX_CTRL_HS400_ES_EN (1 << 27)
/* Bits 3 and 6 are not SDHCI standard definitions */
#define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7
/* Tuning bits */
#define ESDHC_MIX_CTRL_TUNING_MASK 0x03c00000
/* dll control register */
#define ESDHC_DLL_CTRL 0x60
#define ESDHC_DLL_OVERRIDE_VAL_SHIFT 9
#define ESDHC_DLL_OVERRIDE_EN_SHIFT 8
/* tune control register */
#define ESDHC_TUNE_CTRL_STATUS 0x68
#define ESDHC_TUNE_CTRL_STEP 1
#define ESDHC_TUNE_CTRL_MIN 0
#define ESDHC_TUNE_CTRL_MAX ((1 << 7) - 1)
/* strobe dll register */
#define ESDHC_STROBE_DLL_CTRL 0x70
#define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0)
#define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1)
#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3
#define ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT (4 << 20)
#define ESDHC_STROBE_DLL_STATUS 0x74
#define ESDHC_STROBE_DLL_STS_REF_LOCK (1 << 1)
#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0x1
#define ESDHC_VEND_SPEC2 0xc8
#define ESDHC_VEND_SPEC2_EN_BUSY_IRQ (1 << 8)
#define ESDHC_TUNING_CTRL 0xcc
#define ESDHC_STD_TUNING_EN (1 << 24)
/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
#define ESDHC_TUNING_START_TAP_DEFAULT 0x1
#define ESDHC_TUNING_START_TAP_MASK 0xff
#define ESDHC_TUNING_STEP_MASK 0x00070000
#define ESDHC_TUNING_STEP_SHIFT 16
/* pinctrl state */
#define ESDHC_PINCTRL_STATE_100MHZ "state_100mhz"
#define ESDHC_PINCTRL_STATE_200MHZ "state_200mhz"
/*
* Our interpretation of the SDHCI_HOST_CONTROL register
*/
#define ESDHC_CTRL_4BITBUS (0x1 << 1)
#define ESDHC_CTRL_8BITBUS (0x2 << 1)
#define ESDHC_CTRL_BUSWIDTH_MASK (0x3 << 1)
/*
* There is an INT DMA ERR mismatch between eSDHC and STD SDHC SPEC:
* Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
* but bit28 is used as the INT DMA ERR in fsl eSDHC design.
* Define this macro DMA error INT for fsl eSDHC
*/
#define ESDHC_INT_VENDOR_SPEC_DMA_ERR (1 << 28)
/* the address offset of CQHCI */
#define ESDHC_CQHCI_ADDR_OFFSET 0x100
/*
* The CMDTYPE of the CMD register (offset 0xE) should be set to
* "11" when the STOP CMD12 is issued on imx53 to abort one
* open ended multi-blk IO. Otherwise the TC INT wouldn't
* be generated.
* In exact block transfer, the controller doesn't complete the
* operations automatically as required at the end of the
* transfer and remains on hold if the abort command is not sent.
* As a result, the TC flag is not asserted and SW received timeout
* exception. Bit1 of Vendor Spec register is used to fix it.
*/
#define ESDHC_FLAG_MULTIBLK_NO_INT BIT(1)
/*
* The flag tells that the ESDHC controller is an USDHC block that is
* integrated on the i.MX6 series.
*/
#define ESDHC_FLAG_USDHC BIT(3)
/* The IP supports manual tuning process */
#define ESDHC_FLAG_MAN_TUNING BIT(4)
/* The IP supports standard tuning process */
#define ESDHC_FLAG_STD_TUNING BIT(5)
/* The IP has SDHCI_CAPABILITIES_1 register */
#define ESDHC_FLAG_HAVE_CAP1 BIT(6)
/*
* The IP has erratum ERR004536
* uSDHC: ADMA Length Mismatch Error occurs if the AHB read access is slow,
* when reading data from the card
* This flag is also set for i.MX25 and i.MX35 in order to get
* SDHCI_QUIRK_BROKEN_ADMA, but for different reasons (ADMA capability bits).
*/
#define ESDHC_FLAG_ERR004536 BIT(7)
/* The IP supports HS200 mode */
#define ESDHC_FLAG_HS200 BIT(8)
/* The IP supports HS400 mode */
#define ESDHC_FLAG_HS400 BIT(9)
/*
* The IP has errata ERR010450
* uSDHC: Due to the I/O timing limit, for SDR mode, SD card clock can't
* exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
*/
#define ESDHC_FLAG_ERR010450 BIT(10)
/* The IP supports HS400ES mode */
#define ESDHC_FLAG_HS400_ES BIT(11)
/* The IP has Host Controller Interface for Command Queuing */
#define ESDHC_FLAG_CQHCI BIT(12)
/* need request pmqos during low power */
#define ESDHC_FLAG_PMQOS BIT(13)
struct esdhc_soc_data {
u32 flags;
};
static const struct esdhc_soc_data esdhc_imx25_data = {
.flags = ESDHC_FLAG_ERR004536,
};
static const struct esdhc_soc_data esdhc_imx35_data = {
.flags = ESDHC_FLAG_ERR004536,
};
static const struct esdhc_soc_data esdhc_imx51_data = {
.flags = 0,
};
static const struct esdhc_soc_data esdhc_imx53_data = {
.flags = ESDHC_FLAG_MULTIBLK_NO_INT,
};
static const struct esdhc_soc_data usdhc_imx6q_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING,
};
static const struct esdhc_soc_data usdhc_imx6sl_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
| ESDHC_FLAG_HS200,
};
static const struct esdhc_soc_data usdhc_imx6sx_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
};
static const struct esdhc_soc_data usdhc_imx6ull_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_ERR010450,
};
static const struct esdhc_soc_data usdhc_imx7d_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400,
};
static struct esdhc_soc_data usdhc_imx7ulp_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_PMQOS | ESDHC_FLAG_HS400,
};
static struct esdhc_soc_data usdhc_imx8qxp_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
| ESDHC_FLAG_CQHCI,
};
struct pltfm_imx_data {
u32 scratchpad;
struct pinctrl *pinctrl;
struct pinctrl_state *pins_100mhz;
struct pinctrl_state *pins_200mhz;
const struct esdhc_soc_data *socdata;
struct esdhc_platform_data boarddata;
struct clk *clk_ipg;
struct clk *clk_ahb;
struct clk *clk_per;
unsigned int actual_clock;
enum {
NO_CMD_PENDING, /* no multiblock command pending */
MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */
WAIT_FOR_INT, /* sent CMD12, waiting for response INT */
} multiblock_status;
u32 is_ddr;
struct pm_qos_request pm_qos_req;
};
static const struct platform_device_id imx_esdhc_devtype[] = {
{
.name = "sdhci-esdhc-imx25",
.driver_data = (kernel_ulong_t) &esdhc_imx25_data,
}, {
.name = "sdhci-esdhc-imx35",
.driver_data = (kernel_ulong_t) &esdhc_imx35_data,
}, {
.name = "sdhci-esdhc-imx51",
.driver_data = (kernel_ulong_t) &esdhc_imx51_data,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);
static const struct of_device_id imx_esdhc_dt_ids[] = {
{ .compatible = "fsl,imx25-esdhc", .data = &esdhc_imx25_data, },
{ .compatible = "fsl,imx35-esdhc", .data = &esdhc_imx35_data, },
{ .compatible = "fsl,imx51-esdhc", .data = &esdhc_imx51_data, },
{ .compatible = "fsl,imx53-esdhc", .data = &esdhc_imx53_data, },
{ .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, },
{ .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
{ .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
{ .compatible = "fsl,imx6ull-usdhc", .data = &usdhc_imx6ull_data, },
{ .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
{ .compatible = "fsl,imx7ulp-usdhc", .data = &usdhc_imx7ulp_data, },
{ .compatible = "fsl,imx8qxp-usdhc", .data = &usdhc_imx8qxp_data, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
{
return data->socdata == &esdhc_imx25_data;
}
static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
{
return data->socdata == &esdhc_imx53_data;
}
static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
{
return data->socdata == &usdhc_imx6q_data;
}
static inline int esdhc_is_usdhc(struct pltfm_imx_data *data)
{
return !!(data->socdata->flags & ESDHC_FLAG_USDHC);
}
static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
{
void __iomem *base = host->ioaddr + (reg & ~0x3);
u32 shift = (reg & 0x3) * 8;
writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
}
static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 val = readl(host->ioaddr + reg);
if (unlikely(reg == SDHCI_PRESENT_STATE)) {
u32 fsl_prss = val;
/* save the least 20 bits */
val = fsl_prss & 0x000FFFFF;
/* move dat[0-3] bits */
val |= (fsl_prss & 0x0F000000) >> 4;
/* move cmd line bit */
val |= (fsl_prss & 0x00800000) << 1;
}
if (unlikely(reg == SDHCI_CAPABILITIES)) {
/* ignore bit[0-15] as it stores cap_1 register val for mx6sl */
if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
val &= 0xffff0000;
/* In FSL esdhc IC module, only bit20 is used to indicate the
* ADMA2 capability of esdhc, but this bit is messed up on
* some SOCs (e.g. on MX25, MX35 this bit is set, but they
* don't actually support ADMA2). So set the BROKEN_ADMA
* quirk on MX25/35 platforms.
*/
if (val & SDHCI_CAN_DO_ADMA1) {
val &= ~SDHCI_CAN_DO_ADMA1;
val |= SDHCI_CAN_DO_ADMA2;
}
}
if (unlikely(reg == SDHCI_CAPABILITIES_1)) {
if (esdhc_is_usdhc(imx_data)) {
if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
val = readl(host->ioaddr + SDHCI_CAPABILITIES) & 0xFFFF;
else
/* imx6q/dl does not have cap_1 register, fake one */
val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
| SDHCI_SUPPORT_SDR50
| SDHCI_USE_SDR50_TUNING
| (SDHCI_TUNING_MODE_3 << SDHCI_RETUNING_MODE_SHIFT);
if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
val |= SDHCI_SUPPORT_HS400;
/*
* Do not advertise faster UHS modes if there are no
* pinctrl states for 100MHz/200MHz.
*/
if (IS_ERR_OR_NULL(imx_data->pins_100mhz) ||
IS_ERR_OR_NULL(imx_data->pins_200mhz))
val &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50
| SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_HS400);
}
}
if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
val = 0;
val |= 0xFF << SDHCI_MAX_CURRENT_330_SHIFT;
val |= 0xFF << SDHCI_MAX_CURRENT_300_SHIFT;
val |= 0xFF << SDHCI_MAX_CURRENT_180_SHIFT;
}
if (unlikely(reg == SDHCI_INT_STATUS)) {
if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) {
val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR;
val |= SDHCI_INT_ADMA_ERROR;
}
/*
* mask off the interrupt we get in response to the manually
* sent CMD12
*/
if ((imx_data->multiblock_status == WAIT_FOR_INT) &&
((val & SDHCI_INT_RESPONSE) == SDHCI_INT_RESPONSE)) {
val &= ~SDHCI_INT_RESPONSE;
writel(SDHCI_INT_RESPONSE, host->ioaddr +
SDHCI_INT_STATUS);
imx_data->multiblock_status = NO_CMD_PENDING;
}
}
return val;
}
static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 data;
if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE ||
reg == SDHCI_INT_STATUS)) {
if ((val & SDHCI_INT_CARD_INT) && !esdhc_is_usdhc(imx_data)) {
/*
* Clear and then set D3CD bit to avoid missing the
* card interrupt. This is an eSDHC controller problem
* so we need to apply the following workaround: clear
* and set D3CD bit will make eSDHC re-sample the card
* interrupt. In case a card interrupt was lost,
* re-sample it by the following steps.
*/
data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
data &= ~ESDHC_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
data |= ESDHC_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
}
if (val & SDHCI_INT_ADMA_ERROR) {
val &= ~SDHCI_INT_ADMA_ERROR;
val |= ESDHC_INT_VENDOR_SPEC_DMA_ERR;
}
}
if (unlikely((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (reg == SDHCI_INT_STATUS)
&& (val & SDHCI_INT_DATA_END))) {
u32 v;
v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
v &= ~ESDHC_VENDOR_SPEC_SDIO_QUIRK;
writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
if (imx_data->multiblock_status == MULTIBLK_IN_PROCESS)
{
/* send a manual CMD12 with RESPTYP=none */
data = MMC_STOP_TRANSMISSION << 24 |
SDHCI_CMD_ABORTCMD << 16;
writel(data, host->ioaddr + SDHCI_TRANSFER_MODE);
imx_data->multiblock_status = WAIT_FOR_INT;
}
}
writel(val, host->ioaddr + reg);
}
static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u16 ret = 0;
u32 val;
if (unlikely(reg == SDHCI_HOST_VERSION)) {
reg ^= 2;
if (esdhc_is_usdhc(imx_data)) {
/*
* The usdhc register returns a wrong host version.
* Correct it here.
*/
return SDHCI_SPEC_300;
}
}
if (unlikely(reg == SDHCI_HOST_CONTROL2)) {
val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
if (val & ESDHC_VENDOR_SPEC_VSELECT)
ret |= SDHCI_CTRL_VDD_180;
if (esdhc_is_usdhc(imx_data)) {
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
val = readl(host->ioaddr + ESDHC_MIX_CTRL);
else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
/* the std tuning bits is in ACMD12_ERR for imx6sl */
val = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
}
if (val & ESDHC_MIX_CTRL_EXE_TUNE)
ret |= SDHCI_CTRL_EXEC_TUNING;
if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
ret |= SDHCI_CTRL_TUNED_CLK;
ret &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
return ret;
}
if (unlikely(reg == SDHCI_TRANSFER_MODE)) {
if (esdhc_is_usdhc(imx_data)) {
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
ret = m & ESDHC_MIX_CTRL_SDHCI_MASK;
/* Swap AC23 bit */
if (m & ESDHC_MIX_CTRL_AC23EN) {
ret &= ~ESDHC_MIX_CTRL_AC23EN;
ret |= SDHCI_TRNS_AUTO_CMD23;
}
} else {
ret = readw(host->ioaddr + SDHCI_TRANSFER_MODE);
}
return ret;
}
return readw(host->ioaddr + reg);
}
static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 new_val = 0;
switch (reg) {
case SDHCI_CLOCK_CONTROL:
new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
if (val & SDHCI_CLOCK_CARD_EN)
new_val |= ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
else
new_val &= ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
return;
case SDHCI_HOST_CONTROL2:
new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
if (val & SDHCI_CTRL_VDD_180)
new_val |= ESDHC_VENDOR_SPEC_VSELECT;
else
new_val &= ~ESDHC_VENDOR_SPEC_VSELECT;
writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (val & SDHCI_CTRL_TUNED_CLK) {
new_val |= ESDHC_MIX_CTRL_SMPCLK_SEL;
new_val |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
} else {
new_val &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
new_val &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
}
writel(new_val , host->ioaddr + ESDHC_MIX_CTRL);
} else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
u32 v = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (val & SDHCI_CTRL_TUNED_CLK) {
v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
} else {
v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
m &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
}
if (val & SDHCI_CTRL_EXEC_TUNING) {
v |= ESDHC_MIX_CTRL_EXE_TUNE;
m |= ESDHC_MIX_CTRL_FBCLK_SEL;
m |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
} else {
v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
}
writel(v, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
}
return;
case SDHCI_TRANSFER_MODE:
if ((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (host->cmd->opcode == SD_IO_RW_EXTENDED)
&& (host->cmd->data->blocks > 1)
&& (host->cmd->data->flags & MMC_DATA_READ)) {
u32 v;
v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
v |= ESDHC_VENDOR_SPEC_SDIO_QUIRK;
writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
}
if (esdhc_is_usdhc(imx_data)) {
u32 wml;
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
/* Swap AC23 bit */
if (val & SDHCI_TRNS_AUTO_CMD23) {
val &= ~SDHCI_TRNS_AUTO_CMD23;
val |= ESDHC_MIX_CTRL_AC23EN;
}
m = val | (m & ~ESDHC_MIX_CTRL_SDHCI_MASK);
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
/* Set watermark levels for PIO access to maximum value
* (128 words) to accommodate full 512 bytes buffer.
* For DMA access restore the levels to default value.
*/
m = readl(host->ioaddr + ESDHC_WTMK_LVL);
if (val & SDHCI_TRNS_DMA)
wml = ESDHC_WTMK_LVL_WML_VAL_DEF;
else
wml = ESDHC_WTMK_LVL_WML_VAL_MAX;
m &= ~(ESDHC_WTMK_LVL_RD_WML_MASK |
ESDHC_WTMK_LVL_WR_WML_MASK);
m |= (wml << ESDHC_WTMK_LVL_RD_WML_SHIFT) |
(wml << ESDHC_WTMK_LVL_WR_WML_SHIFT);
writel(m, host->ioaddr + ESDHC_WTMK_LVL);
} else {
/*
* Postpone this write, we must do it together with a
* command write that is down below.
*/
imx_data->scratchpad = val;
}
return;
case SDHCI_COMMAND:
if (host->cmd->opcode == MMC_STOP_TRANSMISSION)
val |= SDHCI_CMD_ABORTCMD;
if ((host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
(imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
imx_data->multiblock_status = MULTIBLK_IN_PROCESS;
if (esdhc_is_usdhc(imx_data))
writel(val << 16,
host->ioaddr + SDHCI_TRANSFER_MODE);
else
writel(val << 16 | imx_data->scratchpad,
host->ioaddr + SDHCI_TRANSFER_MODE);
return;
case SDHCI_BLOCK_SIZE:
val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
break;
}
esdhc_clrset_le(host, 0xffff, val, reg);
}
static u8 esdhc_readb_le(struct sdhci_host *host, int reg)
{
u8 ret;
u32 val;
switch (reg) {
case SDHCI_HOST_CONTROL:
val = readl(host->ioaddr + reg);
ret = val & SDHCI_CTRL_LED;
ret |= (val >> 5) & SDHCI_CTRL_DMA_MASK;
ret |= (val & ESDHC_CTRL_4BITBUS);
ret |= (val & ESDHC_CTRL_8BITBUS) << 3;
return ret;
}
return readb(host->ioaddr + reg);
}
static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 new_val = 0;
u32 mask;
switch (reg) {
case SDHCI_POWER_CONTROL:
/*
* FSL put some DMA bits here
* If your board has a regulator, code should be here
*/
return;
case SDHCI_HOST_CONTROL:
/* FSL messed up here, so we need to manually compose it. */
new_val = val & SDHCI_CTRL_LED;
/* ensure the endianness */
new_val |= ESDHC_HOST_CONTROL_LE;
/* bits 8&9 are reserved on mx25 */
if (!is_imx25_esdhc(imx_data)) {
/* DMA mode bits are shifted */
new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
}
/*
* Do not touch buswidth bits here. This is done in
* esdhc_pltfm_bus_width.
* Do not touch the D3CD bit either which is used for the
* SDIO interrupt erratum workaround.
*/
mask = 0xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);
esdhc_clrset_le(host, mask, new_val, reg);
return;
case SDHCI_SOFTWARE_RESET:
if (val & SDHCI_RESET_DATA)
new_val = readl(host->ioaddr + SDHCI_HOST_CONTROL);
break;
}
esdhc_clrset_le(host, 0xff, val, reg);
if (reg == SDHCI_SOFTWARE_RESET) {
if (val & SDHCI_RESET_ALL) {
/*
* The esdhc has a design violation to SDHC spec which
* tells that software reset should not affect card
* detection circuit. But esdhc clears its SYSCTL
* register bits [0..2] during the software reset. This
* will stop those clocks that card detection circuit
* relies on. To work around it, we turn the clocks on
* back to keep card detection circuit functional.
*/
esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
/*
* The reset on usdhc fails to clear MIX_CTRL register.
* Do it manually here.
*/
if (esdhc_is_usdhc(imx_data)) {
/*
* the tuning bits should be kept during reset
*/
new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
writel(new_val & ESDHC_MIX_CTRL_TUNING_MASK,
host->ioaddr + ESDHC_MIX_CTRL);
imx_data->is_ddr = 0;
}
} else if (val & SDHCI_RESET_DATA) {
/*
* The eSDHC DAT line software reset clears at least the
* data transfer width on i.MX25, so make sure that the
* Host Control register is unaffected.
*/
esdhc_clrset_le(host, 0xff, new_val,
SDHCI_HOST_CONTROL);
}
}
}
static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return pltfm_host->clock;
}
static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return pltfm_host->clock / 256 / 16;
}
static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
unsigned int host_clock = pltfm_host->clock;
int ddr_pre_div = imx_data->is_ddr ? 2 : 1;
int pre_div = 1;
int div = 1;
u32 temp, val;
if (esdhc_is_usdhc(imx_data)) {
val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
writel(val & ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
host->ioaddr + ESDHC_VENDOR_SPEC);
}
if (clock == 0) {
host->mmc->actual_clock = 0;
return;
}
/* For i.MX53 eSDHCv3, SYSCTL.SDCLKFS may not be set to 0. */
if (is_imx53_esdhc(imx_data)) {
/*
* According to the i.MX53 reference manual, if DLLCTRL[10] can
* be set, then the controller is eSDHCv3, else it is eSDHCv2.
*/
val = readl(host->ioaddr + ESDHC_DLL_CTRL);
writel(val | BIT(10), host->ioaddr + ESDHC_DLL_CTRL);
temp = readl(host->ioaddr + ESDHC_DLL_CTRL);
writel(val, host->ioaddr + ESDHC_DLL_CTRL);
if (temp & BIT(10))
pre_div = 2;
}
temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
| ESDHC_CLOCK_MASK);
sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
if (imx_data->socdata->flags & ESDHC_FLAG_ERR010450) {
unsigned int max_clock;
max_clock = imx_data->is_ddr ? 45000000 : 150000000;
clock = min(clock, max_clock);
}
while (host_clock / (16 * pre_div * ddr_pre_div) > clock &&
pre_div < 256)
pre_div *= 2;
while (host_clock / (div * pre_div * ddr_pre_div) > clock && div < 16)
div++;
host->mmc->actual_clock = host_clock / (div * pre_div * ddr_pre_div);
dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
clock, host->mmc->actual_clock);
pre_div >>= 1;
div--;
temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
| (div << ESDHC_DIVIDER_SHIFT)
| (pre_div << ESDHC_PREDIV_SHIFT));
sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
if (esdhc_is_usdhc(imx_data)) {
val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
writel(val | ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
host->ioaddr + ESDHC_VENDOR_SPEC);
}
mdelay(1);
}
static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
switch (boarddata->wp_type) {
case ESDHC_WP_GPIO:
return mmc_gpio_get_ro(host->mmc);
case ESDHC_WP_CONTROLLER:
return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
SDHCI_WRITE_PROTECT);
case ESDHC_WP_NONE:
break;
}
return -ENOSYS;
}
static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
{
u32 ctrl;
switch (width) {
case MMC_BUS_WIDTH_8:
ctrl = ESDHC_CTRL_8BITBUS;
break;
case MMC_BUS_WIDTH_4:
ctrl = ESDHC_CTRL_4BITBUS;
break;
default:
ctrl = 0;
break;
}
esdhc_clrset_le(host, ESDHC_CTRL_BUSWIDTH_MASK, ctrl,
SDHCI_HOST_CONTROL);
}
static int usdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
/*
* i.MX uSDHC internally already uses a fixed optimized timing for
* DDR50, normally does not require tuning for DDR50 mode.
*/
if (host->timing == MMC_TIMING_UHS_DDR50)
return 0;
return sdhci_execute_tuning(mmc, opcode);
}
static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
{
u32 reg;
/* FIXME: delay a bit for card to be ready for next tuning due to errors */
mdelay(1);
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL |
ESDHC_MIX_CTRL_FBCLK_SEL;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
writel(val << 8, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
dev_dbg(mmc_dev(host->mmc),
"tuning with delay 0x%x ESDHC_TUNE_CTRL_STATUS 0x%x\n",
val, readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS));
}
static void esdhc_post_tuning(struct sdhci_host *host)
{
u32 reg;
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg &= ~ESDHC_MIX_CTRL_EXE_TUNE;
reg |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
}
static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
{
int min, max, avg, ret;
/* find the mininum delay first which can pass tuning */
min = ESDHC_TUNE_CTRL_MIN;
while (min < ESDHC_TUNE_CTRL_MAX) {
esdhc_prepare_tuning(host, min);
if (!mmc_send_tuning(host->mmc, opcode, NULL))
break;
min += ESDHC_TUNE_CTRL_STEP;
}
/* find the maxinum delay which can not pass tuning */
max = min + ESDHC_TUNE_CTRL_STEP;
while (max < ESDHC_TUNE_CTRL_MAX) {
esdhc_prepare_tuning(host, max);
if (mmc_send_tuning(host->mmc, opcode, NULL)) {
max -= ESDHC_TUNE_CTRL_STEP;
break;
}
max += ESDHC_TUNE_CTRL_STEP;
}
/* use average delay to get the best timing */
avg = (min + max) / 2;
esdhc_prepare_tuning(host, avg);
ret = mmc_send_tuning(host->mmc, opcode, NULL);
esdhc_post_tuning(host);
dev_dbg(mmc_dev(host->mmc), "tuning %s at 0x%x ret %d\n",
ret ? "failed" : "passed", avg, ret);
return ret;
}
static void esdhc_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
u32 m;
m = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (ios->enhanced_strobe)
m |= ESDHC_MIX_CTRL_HS400_ES_EN;
else
m &= ~ESDHC_MIX_CTRL_HS400_ES_EN;
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
}
static int esdhc_change_pinstate(struct sdhci_host *host,
unsigned int uhs)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
struct pinctrl_state *pinctrl;
dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
if (IS_ERR(imx_data->pinctrl) ||
IS_ERR(imx_data->pins_100mhz) ||
IS_ERR(imx_data->pins_200mhz))
return -EINVAL;
switch (uhs) {
case MMC_TIMING_UHS_SDR50:
case MMC_TIMING_UHS_DDR50:
pinctrl = imx_data->pins_100mhz;
break;
case MMC_TIMING_UHS_SDR104:
case MMC_TIMING_MMC_HS200:
case MMC_TIMING_MMC_HS400:
pinctrl = imx_data->pins_200mhz;
break;
default:
/* back to default state for other legacy timing */
return pinctrl_select_default_state(mmc_dev(host->mmc));
}
return pinctrl_select_state(imx_data->pinctrl, pinctrl);
}
/*
* For HS400 eMMC, there is a data_strobe line. This signal is generated
* by the device and used for data output and CRC status response output
* in HS400 mode. The frequency of this signal follows the frequency of
* CLK generated by host. The host receives the data which is aligned to the
* edge of data_strobe line. Due to the time delay between CLK line and
* data_strobe line, if the delay time is larger than one clock cycle,
* then CLK and data_strobe line will be misaligned, read error shows up.
*/
static void esdhc_set_strobe_dll(struct sdhci_host *host)
{
u32 v;
/* disable clock before enabling strobe dll */
writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
host->ioaddr + ESDHC_VENDOR_SPEC);
/* force a reset on strobe dll */
writel(ESDHC_STROBE_DLL_CTRL_RESET,
host->ioaddr + ESDHC_STROBE_DLL_CTRL);
/* clear the reset bit on strobe dll before any setting */
writel(0, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
/*
* enable strobe dll ctrl and adjust the delay target
* for the uSDHC loopback read clock
*/
v = ESDHC_STROBE_DLL_CTRL_ENABLE |
ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT |
(7 << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
/* wait 5us to make sure strobe dll status register stable */
udelay(5);
v = readl(host->ioaddr + ESDHC_STROBE_DLL_STATUS);
if (!(v & ESDHC_STROBE_DLL_STS_REF_LOCK))
dev_warn(mmc_dev(host->mmc),
"warning! HS400 strobe DLL status REF not lock!\n");
if (!(v & ESDHC_STROBE_DLL_STS_SLV_LOCK))
dev_warn(mmc_dev(host->mmc),
"warning! HS400 strobe DLL status SLV not lock!\n");
}
static void esdhc_reset_tuning(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 ctrl;
/* Reset the tuning circuit */
if (esdhc_is_usdhc(imx_data)) {
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
ctrl = readl(host->ioaddr + ESDHC_MIX_CTRL);
ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
ctrl &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
writel(ctrl, host->ioaddr + ESDHC_MIX_CTRL);
writel(0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
} else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
ctrl = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
writel(ctrl, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
}
}
}
static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
{
u32 m;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
/* disable ddr mode and disable HS400 mode */
m = readl(host->ioaddr + ESDHC_MIX_CTRL);
m &= ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN);
imx_data->is_ddr = 0;
switch (timing) {
case MMC_TIMING_UHS_SDR12:
case MMC_TIMING_UHS_SDR25:
case MMC_TIMING_UHS_SDR50:
case MMC_TIMING_UHS_SDR104:
case MMC_TIMING_MMC_HS:
case MMC_TIMING_MMC_HS200:
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
break;
case MMC_TIMING_UHS_DDR50:
case MMC_TIMING_MMC_DDR52:
m |= ESDHC_MIX_CTRL_DDREN;
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
imx_data->is_ddr = 1;
if (boarddata->delay_line) {
u32 v;
v = boarddata->delay_line <<
ESDHC_DLL_OVERRIDE_VAL_SHIFT |
(1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
if (is_imx53_esdhc(imx_data))
v <<= 1;
writel(v, host->ioaddr + ESDHC_DLL_CTRL);
}
break;
case MMC_TIMING_MMC_HS400:
m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
imx_data->is_ddr = 1;
/* update clock after enable DDR for strobe DLL lock */
host->ops->set_clock(host, host->clock);
esdhc_set_strobe_dll(host);
break;
case MMC_TIMING_LEGACY:
default:
esdhc_reset_tuning(host);
break;
}
esdhc_change_pinstate(host, timing);
}
static void esdhc_reset(struct sdhci_host *host, u8 mask)
{
sdhci_reset(host, mask);
sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
}
static unsigned int esdhc_get_max_timeout_count(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
/* Doc Erratum: the uSDHC actual maximum timeout count is 1 << 29 */
return esdhc_is_usdhc(imx_data) ? 1 << 29 : 1 << 27;
}
static void esdhc_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
/* use maximum timeout counter */
esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
esdhc_is_usdhc(imx_data) ? 0xF : 0xE,
SDHCI_TIMEOUT_CONTROL);
}
static u32 esdhc_cqhci_irq(struct sdhci_host *host, u32 intmask)
{
int cmd_error = 0;
int data_error = 0;
if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
return intmask;
cqhci_irq(host->mmc, intmask, cmd_error, data_error);
return 0;
}
static struct sdhci_ops sdhci_esdhc_ops = {
.read_l = esdhc_readl_le,
.read_w = esdhc_readw_le,
.read_b = esdhc_readb_le,
.write_l = esdhc_writel_le,
.write_w = esdhc_writew_le,
.write_b = esdhc_writeb_le,
.set_clock = esdhc_pltfm_set_clock,
.get_max_clock = esdhc_pltfm_get_max_clock,
.get_min_clock = esdhc_pltfm_get_min_clock,
.get_max_timeout_count = esdhc_get_max_timeout_count,
.get_ro = esdhc_pltfm_get_ro,
.set_timeout = esdhc_set_timeout,
.set_bus_width = esdhc_pltfm_set_bus_width,
.set_uhs_signaling = esdhc_set_uhs_signaling,
.reset = esdhc_reset,
.irq = esdhc_cqhci_irq,
};
static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
| SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
| SDHCI_QUIRK_BROKEN_CARD_DETECTION,
.ops = &sdhci_esdhc_ops,
};
static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
int tmp;
if (esdhc_is_usdhc(imx_data)) {
/*
* The imx6q ROM code will change the default watermark
* level setting to something insane. Change it back here.
*/
writel(ESDHC_WTMK_DEFAULT_VAL, host->ioaddr + ESDHC_WTMK_LVL);
/*
* ROM code will change the bit burst_length_enable setting
* to zero if this usdhc is chosen to boot system. Change
* it back here, otherwise it will impact the performance a
* lot. This bit is used to enable/disable the burst length
* for the external AHB2AXI bridge. It's useful especially
* for INCR transfer because without burst length indicator,
* the AHB2AXI bridge does not know the burst length in
* advance. And without burst length indicator, AHB INCR
* transfer can only be converted to singles on the AXI side.
*/
writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
| ESDHC_BURST_LEN_EN_INCR,
host->ioaddr + SDHCI_HOST_CONTROL);
/*
* erratum ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
* TO1.1, it's harmless for MX6SL
*/
writel(readl(host->ioaddr + 0x6c) & ~BIT(7),
host->ioaddr + 0x6c);
/* disable DLL_CTRL delay line settings */
writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
/*
* For the case of command with busy, if set the bit
* ESDHC_VEND_SPEC2_EN_BUSY_IRQ, USDHC will generate a
* transfer complete interrupt when busy is deasserted.
* When CQHCI use DCMD to send a CMD need R1b respons,
* CQHCI require to set ESDHC_VEND_SPEC2_EN_BUSY_IRQ,
* otherwise DCMD will always meet timeout waiting for
* hardware interrupt issue.
*/
if (imx_data->socdata->flags & ESDHC_FLAG_CQHCI) {
tmp = readl(host->ioaddr + ESDHC_VEND_SPEC2);
tmp |= ESDHC_VEND_SPEC2_EN_BUSY_IRQ;
writel(tmp, host->ioaddr + ESDHC_VEND_SPEC2);
host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
}
if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
tmp |= ESDHC_STD_TUNING_EN |
ESDHC_TUNING_START_TAP_DEFAULT;
if (imx_data->boarddata.tuning_start_tap) {
tmp &= ~ESDHC_TUNING_START_TAP_MASK;
tmp |= imx_data->boarddata.tuning_start_tap;
}
if (imx_data->boarddata.tuning_step) {
tmp &= ~ESDHC_TUNING_STEP_MASK;
tmp |= imx_data->boarddata.tuning_step
<< ESDHC_TUNING_STEP_SHIFT;
}
writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
} else if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
/*
* ESDHC_STD_TUNING_EN may be configed in bootloader
* or ROM code, so clear this bit here to make sure
* the manual tuning can work.
*/
tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
tmp &= ~ESDHC_STD_TUNING_EN;
writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
}
}
}
static void esdhc_cqe_enable(struct mmc_host *mmc)
{
struct sdhci_host *host = mmc_priv(mmc);
struct cqhci_host *cq_host = mmc->cqe_private;
u32 reg;
u16 mode;
int count = 10;
/*
* CQE gets stuck if it sees Buffer Read Enable bit set, which can be
* the case after tuning, so ensure the buffer is drained.
*/
reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
while (reg & SDHCI_DATA_AVAILABLE) {
sdhci_readl(host, SDHCI_BUFFER);
reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
if (count-- == 0) {
dev_warn(mmc_dev(host->mmc),
"CQE may get stuck because the Buffer Read Enable bit is set\n");
break;
}
mdelay(1);
}
/*
* Runtime resume will reset the entire host controller, which
* will also clear the DMAEN/BCEN of register ESDHC_MIX_CTRL.
* Here set DMAEN and BCEN when enable CMDQ.
*/
mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
if (host->flags & SDHCI_REQ_USE_DMA)
mode |= SDHCI_TRNS_DMA;
if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
mode |= SDHCI_TRNS_BLK_CNT_EN;
sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
/*
* Though Runtime resume reset the entire host controller,
* but do not impact the CQHCI side, need to clear the
* HALT bit, avoid CQHCI stuck in the first request when
* system resume back.
*/
cqhci_writel(cq_host, 0, CQHCI_CTL);
if (cqhci_readl(cq_host, CQHCI_CTL) && CQHCI_HALT)
dev_err(mmc_dev(host->mmc),
"failed to exit halt state when enable CQE\n");
sdhci_cqe_enable(mmc);
}
static void esdhc_sdhci_dumpregs(struct mmc_host *mmc)
{
sdhci_dumpregs(mmc_priv(mmc));
}
static const struct cqhci_host_ops esdhc_cqhci_ops = {
.enable = esdhc_cqe_enable,
.disable = sdhci_cqe_disable,
.dumpregs = esdhc_sdhci_dumpregs,
};
#ifdef CONFIG_OF
static int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
struct sdhci_host *host,
struct pltfm_imx_data *imx_data)
{
struct device_node *np = pdev->dev.of_node;
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
int ret;
if (of_get_property(np, "fsl,wp-controller", NULL))
boarddata->wp_type = ESDHC_WP_CONTROLLER;
/*
* If we have this property, then activate WP check.
* Retrieveing and requesting the actual WP GPIO will happen
* in the call to mmc_of_parse().
*/
if (of_property_read_bool(np, "wp-gpios"))
boarddata->wp_type = ESDHC_WP_GPIO;
of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
of_property_read_u32(np, "fsl,tuning-start-tap",
&boarddata->tuning_start_tap);
if (of_find_property(np, "no-1-8-v", NULL))
host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
boarddata->delay_line = 0;
mmc_of_parse_voltage(np, &host->ocr_mask);
if (esdhc_is_usdhc(imx_data)) {
imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
ESDHC_PINCTRL_STATE_100MHZ);
imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
ESDHC_PINCTRL_STATE_200MHZ);
}
/* call to generic mmc_of_parse to support additional capabilities */
ret = mmc_of_parse(host->mmc);
if (ret)
return ret;
if (mmc_gpio_get_cd(host->mmc) >= 0)
host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
return 0;
}
#else
static inline int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
struct sdhci_host *host,
struct pltfm_imx_data *imx_data)
{
return -ENODEV;
}
#endif
static int sdhci_esdhc_imx_probe_nondt(struct platform_device *pdev,
struct sdhci_host *host,
struct pltfm_imx_data *imx_data)
{
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
int err;
if (!host->mmc->parent->platform_data) {
dev_err(mmc_dev(host->mmc), "no board data!\n");
return -EINVAL;
}
imx_data->boarddata = *((struct esdhc_platform_data *)
host->mmc->parent->platform_data);
/* write_protect */
if (boarddata->wp_type == ESDHC_WP_GPIO) {
host->mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
err = mmc_gpiod_request_ro(host->mmc, "wp", 0, 0);
if (err) {
dev_err(mmc_dev(host->mmc),
"failed to request write-protect gpio!\n");
return err;
}
}
/* card_detect */
switch (boarddata->cd_type) {
case ESDHC_CD_GPIO:
err = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0);
if (err) {
dev_err(mmc_dev(host->mmc),
"failed to request card-detect gpio!\n");
return err;
}
/* fall through */
case ESDHC_CD_CONTROLLER:
/* we have a working card_detect back */
host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
break;
case ESDHC_CD_PERMANENT:
host->mmc->caps |= MMC_CAP_NONREMOVABLE;
break;
case ESDHC_CD_NONE:
break;
}
switch (boarddata->max_bus_width) {
case 8:
host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA;
break;
case 4:
host->mmc->caps |= MMC_CAP_4_BIT_DATA;
break;
case 1:
default:
host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
break;
}
return 0;
}
static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(imx_esdhc_dt_ids, &pdev->dev);
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_host *host;
struct cqhci_host *cq_host;
int err;
struct pltfm_imx_data *imx_data;
host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata,
sizeof(*imx_data));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
imx_data = sdhci_pltfm_priv(pltfm_host);
imx_data->socdata = of_id ? of_id->data : (struct esdhc_soc_data *)
pdev->id_entry->driver_data;
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_add_request(&imx_data->pm_qos_req,
PM_QOS_CPU_DMA_LATENCY, 0);
imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imx_data->clk_ipg)) {
err = PTR_ERR(imx_data->clk_ipg);
goto free_sdhci;
}
imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(imx_data->clk_ahb)) {
err = PTR_ERR(imx_data->clk_ahb);
goto free_sdhci;
}
imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(imx_data->clk_per)) {
err = PTR_ERR(imx_data->clk_per);
goto free_sdhci;
}
pltfm_host->clk = imx_data->clk_per;
pltfm_host->clock = clk_get_rate(pltfm_host->clk);
err = clk_prepare_enable(imx_data->clk_per);
if (err)
goto free_sdhci;
err = clk_prepare_enable(imx_data->clk_ipg);
if (err)
goto disable_per_clk;
err = clk_prepare_enable(imx_data->clk_ahb);
if (err)
goto disable_ipg_clk;
imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(imx_data->pinctrl)) {
err = PTR_ERR(imx_data->pinctrl);
goto disable_ahb_clk;
}
if (esdhc_is_usdhc(imx_data)) {
host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
host->mmc->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR;
if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
/* clear tuning bits in case ROM has set it already */
writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
writel(0x0, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
/*
* Link usdhc specific mmc_host_ops execute_tuning function,
* to replace the standard one in sdhci_ops.
*/
host->mmc_host_ops.execute_tuning = usdhc_execute_tuning;
}
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
sdhci_esdhc_ops.platform_execute_tuning =
esdhc_executing_tuning;
if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)
host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400;
if (imx_data->socdata->flags & ESDHC_FLAG_HS400_ES) {
host->mmc->caps2 |= MMC_CAP2_HS400_ES;
host->mmc_host_ops.hs400_enhanced_strobe =
esdhc_hs400_enhanced_strobe;
}
if (imx_data->socdata->flags & ESDHC_FLAG_CQHCI) {
host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
cq_host = devm_kzalloc(&pdev->dev, sizeof(*cq_host), GFP_KERNEL);
if (!cq_host) {
err = -ENOMEM;
goto disable_ahb_clk;
}
cq_host->mmio = host->ioaddr + ESDHC_CQHCI_ADDR_OFFSET;
cq_host->ops = &esdhc_cqhci_ops;
err = cqhci_init(cq_host, host->mmc, false);
if (err)
goto disable_ahb_clk;
}
if (of_id)
err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
else
err = sdhci_esdhc_imx_probe_nondt(pdev, host, imx_data);
if (err)
goto disable_ahb_clk;
host->tuning_delay = 1;
sdhci_esdhc_imx_hwinit(host);
err = sdhci_add_host(host);
if (err)
goto disable_ahb_clk;
pm_runtime_set_active(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
pm_suspend_ignore_children(&pdev->dev, 1);
pm_runtime_enable(&pdev->dev);
return 0;
disable_ahb_clk:
clk_disable_unprepare(imx_data->clk_ahb);
disable_ipg_clk:
clk_disable_unprepare(imx_data->clk_ipg);
disable_per_clk:
clk_disable_unprepare(imx_data->clk_per);
free_sdhci:
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_remove_request(&imx_data->pm_qos_req);
sdhci_pltfm_free(pdev);
return err;
}
static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
sdhci_remove_host(host, dead);
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_remove_request(&imx_data->pm_qos_req);
sdhci_pltfm_free(pdev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int sdhci_esdhc_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
int ret;
if (host->mmc->caps2 & MMC_CAP2_CQE) {
ret = cqhci_suspend(host->mmc);
if (ret)
return ret;
}
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
return sdhci_suspend_host(host);
}
static int sdhci_esdhc_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
int ret;
/* re-initialize hw state in case it's lost in low power mode */
sdhci_esdhc_imx_hwinit(host);
ret = sdhci_resume_host(host);
if (ret)
return ret;
if (host->mmc->caps2 & MMC_CAP2_CQE)
ret = cqhci_resume(host->mmc);
return ret;
}
#endif
#ifdef CONFIG_PM
static int sdhci_esdhc_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
int ret;
if (host->mmc->caps2 & MMC_CAP2_CQE) {
ret = cqhci_suspend(host->mmc);
if (ret)
return ret;
}
ret = sdhci_runtime_suspend_host(host);
if (ret)
return ret;
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
imx_data->actual_clock = host->mmc->actual_clock;
esdhc_pltfm_set_clock(host, 0);
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_remove_request(&imx_data->pm_qos_req);
return ret;
}
static int sdhci_esdhc_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
int err;
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_add_request(&imx_data->pm_qos_req,
PM_QOS_CPU_DMA_LATENCY, 0);
err = clk_prepare_enable(imx_data->clk_ahb);
if (err)
goto remove_pm_qos_request;
err = clk_prepare_enable(imx_data->clk_per);
if (err)
goto disable_ahb_clk;
err = clk_prepare_enable(imx_data->clk_ipg);
if (err)
goto disable_per_clk;
esdhc_pltfm_set_clock(host, imx_data->actual_clock);
err = sdhci_runtime_resume_host(host, 0);
if (err)
goto disable_ipg_clk;
if (host->mmc->caps2 & MMC_CAP2_CQE)
err = cqhci_resume(host->mmc);
return err;
disable_ipg_clk:
clk_disable_unprepare(imx_data->clk_ipg);
disable_per_clk:
clk_disable_unprepare(imx_data->clk_per);
disable_ahb_clk:
clk_disable_unprepare(imx_data->clk_ahb);
remove_pm_qos_request:
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
pm_qos_remove_request(&imx_data->pm_qos_req);
return err;
}
#endif
static const struct dev_pm_ops sdhci_esdhc_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(sdhci_esdhc_suspend, sdhci_esdhc_resume)
SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,
sdhci_esdhc_runtime_resume, NULL)
};
static struct platform_driver sdhci_esdhc_imx_driver = {
.driver = {
.name = "sdhci-esdhc-imx",
.of_match_table = imx_esdhc_dt_ids,
.pm = &sdhci_esdhc_pmops,
},
.id_table = imx_esdhc_devtype,
.probe = sdhci_esdhc_imx_probe,
.remove = sdhci_esdhc_imx_remove,
};
module_platform_driver(sdhci_esdhc_imx_driver);
MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
MODULE_LICENSE("GPL v2");
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