// 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/bitfield.h>
#include <linux/io.h>
#include <linux/iopoll.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/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include "sdhci-cqhci.h"
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
#include "cqhci.h"
#define ESDHC_SYS_CTRL_DTOCV_MASK GENMASK(19 , 16 )
#define ESDHC_SYS_CTRL_RST_FIFO BIT(22 )
#define ESDHC_SYS_CTRL_IPP_RST_N BIT(23 )
#define ESDHC_SYS_CTRL_RESET_TUNING BIT(28 )
#define ESDHC_CTRL_D3CD 0 x08
#define ESDHC_BURST_LEN_EN_INCR (1 << 27 )
/* VENDOR SPEC register */
#define ESDHC_VENDOR_SPEC 0 xc0
#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_DEBUG_SEL_AND_STATUS_REG 0 xc2
#define ESDHC_DEBUG_SEL_REG 0 xc3
#define ESDHC_DEBUG_SEL_MASK 0 xf
#define ESDHC_DEBUG_SEL_CMD_STATE 1
#define ESDHC_DEBUG_SEL_DATA_STATE 2
#define ESDHC_DEBUG_SEL_TRANS_STATE 3
#define ESDHC_DEBUG_SEL_DMA_STATE 4
#define ESDHC_DEBUG_SEL_ADMA_STATE 5
#define ESDHC_DEBUG_SEL_FIFO_STATE 6
#define ESDHC_DEBUG_SEL_ASYNC_FIFO_STATE 7
#define ESDHC_WTMK_LVL 0 x44
#define ESDHC_WTMK_DEFAULT_VAL 0 x10401040
#define ESDHC_WTMK_LVL_RD_WML_MASK 0 x000000FF
#define ESDHC_WTMK_LVL_RD_WML_SHIFT 0
#define ESDHC_WTMK_LVL_WR_WML_MASK 0 x00FF0000
#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 0 x48
#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 0 xb7
/* Tuning bits */
#define ESDHC_MIX_CTRL_TUNING_MASK 0 x03c00000
/* dll control register */
#define ESDHC_DLL_CTRL 0 x60
#define ESDHC_DLL_OVERRIDE_VAL_SHIFT 9
#define ESDHC_DLL_OVERRIDE_EN_SHIFT 8
/* tune control register */
#define ESDHC_TUNE_CTRL_STATUS 0 x68
#define ESDHC_TUNE_CTRL_STEP 1
#define ESDHC_TUNE_CTRL_MIN 0
#define ESDHC_TUNE_CTRL_MAX ((1 << 7 ) - 1 )
#define ESDHC_TUNE_CTRL_STATUS_TAP_SEL_MASK GENMASK(30 , 16 )
#define ESDHC_TUNE_CTRL_STATUS_TAP_SEL_PRE_MASK GENMASK(30 , 24 )
#define ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_PRE_MASK GENMASK(14 , 8 )
#define ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_OUT_MASK GENMASK(7 , 4 )
#define ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_POST_MASK GENMASK(3 , 0 )
/* strobe dll register */
#define ESDHC_STROBE_DLL_CTRL 0 x70
#define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0 )
#define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1 )
#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT 0 x7
#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 0 x74
#define ESDHC_STROBE_DLL_STS_REF_LOCK (1 << 1 )
#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0 x1
#define ESDHC_VEND_SPEC2 0 xc8
#define ESDHC_VEND_SPEC2_EN_BUSY_IRQ (1 << 8 )
#define ESDHC_VEND_SPEC2_AUTO_TUNE_8BIT_EN (1 << 4 )
#define ESDHC_VEND_SPEC2_AUTO_TUNE_4BIT_EN (0 << 4 )
#define ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN (2 << 4 )
#define ESDHC_VEND_SPEC2_AUTO_TUNE_CMD_EN (1 << 6 )
#define ESDHC_VEND_SPEC2_AUTO_TUNE_MODE_MASK (7 << 4 )
#define ESDHC_TUNING_CTRL 0 xcc
#define ESDHC_STD_TUNING_EN (1 << 24 )
#define ESDHC_TUNING_WINDOW_MASK GENMASK(22 , 20 )
/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
#define ESDHC_TUNING_START_TAP_DEFAULT 0 x1
#define ESDHC_TUNING_START_TAP_MASK 0 x7f
#define ESDHC_TUNING_CMD_CRC_CHECK_DISABLE (1 << 7 )
#define ESDHC_TUNING_STEP_DEFAULT 0 x1
#define ESDHC_TUNING_STEP_MASK 0 x00070000
#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 (0 x1 << 1 )
#define ESDHC_CTRL_8BITBUS (0 x2 << 1 )
#define ESDHC_CTRL_BUSWIDTH_MASK (0 x3 << 1 )
#define USDHC_GET_BUSWIDTH(c) (c & ESDHC_CTRL_BUSWIDTH_MASK)
/*
* 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 0 x100
/*
* The CMDTYPE of the CMD register ( offset 0 xE ) 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 : At 1 . 8 V due to the I / O timing limit , for SDR mode , SD card
* clock can ' t exceed 150 MHz , for DDR mode , SD card clock can ' t exceed 45 MHz .
*/
#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 )
/* The IP state got lost in low power mode */
#define ESDHC_FLAG_STATE_LOST_IN_LPMODE BIT(14 )
/* The IP lost clock rate in PM_RUNTIME */
#define ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME BIT(15 )
/*
* The IP do not support the ACMD23 feature completely when use ADMA mode .
* In ADMA mode , it only use the 16 bit block count of the register 0 x4
* ( BLOCK_ATT ) as the CMD23 ' s argument for ACMD23 mode , which means it will
* ignore the upper 16 bit of the CMD23 ' s argument . This will block the reliable
* write operation in RPMB , because RPMB reliable write need to set the bit31
* of the CMD23 ' s argument .
* imx6qpdl / imx6sx / imx6sl / imx7d has this limitation only for ADMA mode , SDMA
* do not has this limitation . so when these SoC use ADMA mode , it need to
* disable the ACMD23 feature .
*/
#define ESDHC_FLAG_BROKEN_AUTO_CMD23 BIT(16 )
/* ERR004536 is not applicable for the IP */
#define ESDHC_FLAG_SKIP_ERR004536 BIT(17 )
/* The IP does not have GPIO CD wake capabilities */
#define ESDHC_FLAG_SKIP_CD_WAKE BIT(18 )
/* the controller has dummy pad for clock loopback */
#define ESDHC_FLAG_DUMMY_PAD BIT(19 )
#define ESDHC_AUTO_TUNING_WINDOW 3
enum wp_types {
ESDHC_WP_NONE, /* no WP, neither controller nor gpio */
ESDHC_WP_CONTROLLER, /* mmc controller internal WP */
ESDHC_WP_GPIO, /* external gpio pin for WP */
};
enum cd_types {
ESDHC_CD_NONE, /* no CD, neither controller nor gpio */
ESDHC_CD_CONTROLLER, /* mmc controller internal CD */
ESDHC_CD_GPIO, /* external gpio pin for CD */
ESDHC_CD_PERMANENT, /* no CD, card permanently wired to host */
};
/*
* struct esdhc_platform_data - platform data for esdhc on i . MX
*
* ESDHC_WP ( CD ) _ CONTROLLER type is not available on i . MX25 / 35 .
*
* @ wp_type : type of write_protect method ( see wp_types enum above )
* @ cd_type : type of card_detect method ( see cd_types enum above )
*/
struct esdhc_platform_data {
enum wp_types wp_type;
enum cd_types cd_type;
int max_bus_width;
unsigned int delay_line;
unsigned int tuning_step; /* The delay cell steps in tuning procedure */
unsigned int tuning_start_tap; /* The start delay cell point in tuning procedure */
unsigned int strobe_dll_delay_target; /* The delay cell for strobe pad (read clock) */
unsigned int saved_tuning_delay_cell; /* save the value of tuning delay cell */
unsigned int saved_auto_tuning_window; /* save the auto tuning window width */
};
struct esdhc_soc_data {
u32 flags;
u32 quirks;
};
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
| ESDHC_FLAG_BROKEN_AUTO_CMD23,
};
static const struct esdhc_soc_data usdhc_imx6sl_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
| ESDHC_FLAG_HS200
| ESDHC_FLAG_BROKEN_AUTO_CMD23,
};
static const struct esdhc_soc_data usdhc_imx6sll_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400
| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
};
static const struct esdhc_soc_data usdhc_imx6sx_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_STATE_LOST_IN_LPMODE
| ESDHC_FLAG_BROKEN_AUTO_CMD23,
};
static const struct esdhc_soc_data usdhc_imx6ull_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_ERR010450
| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
};
static const struct esdhc_soc_data usdhc_imx7d_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400
| ESDHC_FLAG_STATE_LOST_IN_LPMODE
| ESDHC_FLAG_BROKEN_AUTO_CMD23,
};
static struct esdhc_soc_data usdhc_s32g2_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
| ESDHC_FLAG_SKIP_ERR004536 | ESDHC_FLAG_SKIP_CD_WAKE,
.quirks = SDHCI_QUIRK_NO_LED,
};
static struct esdhc_soc_data usdhc_imx7ulp_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_PMQOS | ESDHC_FLAG_HS400
| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
.quirks = SDHCI_QUIRK_NO_LED,
};
static struct esdhc_soc_data usdhc_imxrt1050_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
.quirks = SDHCI_QUIRK_NO_LED,
};
static struct esdhc_soc_data usdhc_imx8qxp_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
| ESDHC_FLAG_STATE_LOST_IN_LPMODE
| ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME,
.quirks = SDHCI_QUIRK_NO_LED,
};
static struct esdhc_soc_data usdhc_imx8mm_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
| ESDHC_FLAG_STATE_LOST_IN_LPMODE,
.quirks = SDHCI_QUIRK_NO_LED,
};
static struct esdhc_soc_data usdhc_imx95_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING
| ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
| ESDHC_FLAG_HS400 | ESDHC_FLAG_HS400_ES
| ESDHC_FLAG_STATE_LOST_IN_LPMODE
| ESDHC_FLAG_DUMMY_PAD,
.quirks = SDHCI_QUIRK_NO_LED,
};
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;
/*
* USDHC has one limition , require the SDIO device a different
* register setting . Driver has to recognize card type during
* the card init , but at this stage , mmc_host - > card is not
* available . So involve this field to save the card type
* during card init through usdhc_init_card ( ) .
*/
unsigned int init_card_type;
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 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,imx6sll-usdhc" , .data = &usdhc_imx6sll_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, },
{ .compatible = "fsl,imx8mm-usdhc" , .data = &usdhc_imx8mm_data, },
{ .compatible = "fsl,imx94-usdhc" , .data = &usdhc_imx95_data, },
{ .compatible = "fsl,imx95-usdhc" , .data = &usdhc_imx95_data, },
{ .compatible = "fsl,imxrt1050-usdhc" , .data = &usdhc_imxrt1050_data, },
{ .compatible = "nxp,s32g2-usdhc" , .data = &usdhc_s32g2_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 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 & ~0 x3);
u32 shift = (reg & 0 x3) * 8 ;
writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
}
#define DRIVER_NAME "sdhci-esdhc-imx"
#define ESDHC_IMX_DUMP(f, x...) \
pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
static void esdhc_dump_debug_regs(struct sdhci_host *host)
{
int i;
char *debug_status[7 ] = {
"cmd debug status" ,
"data debug status" ,
"trans debug status" ,
"dma debug status" ,
"adma debug status" ,
"fifo debug status" ,
"async fifo debug status"
};
ESDHC_IMX_DUMP("========= ESDHC IMX DEBUG STATUS DUMP =========\n" );
for (i = 0 ; i < 7 ; i++) {
esdhc_clrset_le(host, ESDHC_DEBUG_SEL_MASK,
ESDHC_DEBUG_SEL_CMD_STATE + i, ESDHC_DEBUG_SEL_REG);
ESDHC_IMX_DUMP("%s: 0x%04x\n" , debug_status[i],
readw(host->ioaddr + ESDHC_DEBUG_SEL_AND_STATUS_REG));
}
esdhc_clrset_le(host, ESDHC_DEBUG_SEL_MASK, 0 , ESDHC_DEBUG_SEL_REG);
}
static inline void esdhc_wait_for_card_clock_gate_off(struct sdhci_host *host)
{
u32 present_state;
int ret;
ret = readl_poll_timeout(host->ioaddr + ESDHC_PRSSTAT, present_state,
(present_state & ESDHC_CLOCK_GATE_OFF), 2 , 100 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc), "%s: card clock still not gate off in 100us!.\n" , __func__);
}
/* Enable the auto tuning circuit to check the CMD line and BUS line */
static inline void usdhc_auto_tuning_mode_sel_and_en(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 buswidth, auto_tune_buswidth;
u32 reg;
buswidth = USDHC_GET_BUSWIDTH(readl(host->ioaddr + SDHCI_HOST_CONTROL));
switch (buswidth) {
case ESDHC_CTRL_8BITBUS:
auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_8BIT_EN;
break ;
case ESDHC_CTRL_4BITBUS:
auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_4BIT_EN;
break ;
default : /* 1BITBUS */
auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN;
break ;
}
/*
* For USDHC , auto tuning circuit can not handle the async sdio
* device interrupt correctly . When sdio device use 4 data lines ,
* async sdio interrupt will use the shared DAT [ 1 ] , if enable auto
* tuning circuit check these 4 data lines , include the DAT [ 1 ] ,
* this circuit will detect this interrupt , take this as a data on
* DAT [ 1 ] , and adjust the delay cell wrongly .
* This is the hardware design limitation , to avoid this , for sdio
* device , config the auto tuning circuit only check DAT [ 0 ] and CMD
* line .
*/
if (imx_data->init_card_type == MMC_TYPE_SDIO)
auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN;
esdhc_clrset_le(host, ESDHC_VEND_SPEC2_AUTO_TUNE_MODE_MASK,
auto_tune_buswidth | ESDHC_VEND_SPEC2_AUTO_TUNE_CMD_EN,
ESDHC_VEND_SPEC2);
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
}
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 & 0 x000FFFFF;
/* move dat[0-3] bits */
val |= (fsl_prss & 0 x0F000000) >> 4 ;
/* move cmd line bit */
val |= (fsl_prss & 0 x00800000) << 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 &= 0 xffff0000;
/* 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) & 0 xFFFF;
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
| FIELD_PREP(SDHCI_RETUNING_MODE_MASK,
SDHCI_TUNING_MODE_3);
/*
* Do not advertise faster UHS modes if there are no
* pinctrl states for 100 MHz / 200 MHz .
*/
if (IS_ERR_OR_NULL(imx_data->pins_100mhz))
val &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50);
if (IS_ERR_OR_NULL(imx_data->pins_200mhz))
val &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_HS400);
}
}
if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
val = 0 ;
val |= FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, 0 xFF);
val |= FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, 0 xFF);
val |= FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, 0 xFF);
}
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);
if (!(new_val & ESDHC_VENDOR_SPEC_FRC_SDCLK_ON))
esdhc_wait_for_card_clock_gate_off(host);
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_STD_TUNING) {
u32 v = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
if (val & SDHCI_CTRL_TUNED_CLK)
v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
else
v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
if (val & SDHCI_CTRL_EXEC_TUNING)
v |= ESDHC_MIX_CTRL_EXE_TUNE;
else
v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
writel(v, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
}
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 {
u8 ctrl;
wml = ESDHC_WTMK_LVL_WML_VAL_MAX;
/*
* Since already disable DMA mode , so also need
* to clear the DMASEL . Otherwise , for standard
* tuning , when send tuning command , usdhc will
* still prefetch the ADMA script from wrong
* DMA address , then we will see IOMMU report
* some error which show lack of TLB mapping .
*/
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl &= ~SDHCI_CTRL_DMA_MASK;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
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(0 x7, 0 );
break ;
}
esdhc_clrset_le(host, 0 xffff, 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 = 0 xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);
esdhc_clrset_le(host, mask, new_val, reg);
return ;
case SDHCI_TIMEOUT_CONTROL:
esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
FIELD_PREP(ESDHC_SYS_CTRL_DTOCV_MASK, val),
ESDHC_SYSTEM_CONTROL);
return ;
case SDHCI_SOFTWARE_RESET:
if (val & SDHCI_RESET_DATA)
new_val = readl(host->ioaddr + SDHCI_HOST_CONTROL);
break ;
}
esdhc_clrset_le(host, 0 xff, 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, 0 x7, 0 x7, 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, 0 xff, 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 ;
int ret;
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);
esdhc_wait_for_card_clock_gate_off(host);
}
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) &&
(!(host->quirks2 & SDHCI_QUIRK2_NO_1_8_V))) {
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);
/* need to wait the bit 3 of the PRSSTAT to be set, make sure card clock is stable */
ret = readl_poll_timeout(host->ioaddr + ESDHC_PRSSTAT, temp,
(temp & ESDHC_CLOCK_STABLE), 2 , 100 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc), "card clock still not stable in 100us!.\n" );
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);
}
}
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 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, tuning_ctrl, sys_ctrl;
int ret;
/* Reset the tuning circuit */
if (esdhc_is_usdhc(imx_data)) {
ctrl = readl(host->ioaddr + ESDHC_MIX_CTRL);
ctrl &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_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) {
writel(ctrl, host->ioaddr + ESDHC_MIX_CTRL);
/*
* enable the std tuning just in case it cleared in
* sdhc_esdhc_tuning_restore .
*/
tuning_ctrl = readl(host->ioaddr + ESDHC_TUNING_CTRL);
if (!(tuning_ctrl & ESDHC_STD_TUNING_EN)) {
tuning_ctrl |= ESDHC_STD_TUNING_EN;
writel(tuning_ctrl, host->ioaddr + ESDHC_TUNING_CTRL);
}
/* set the reset tuning bit */
sys_ctrl = readl(host->ioaddr + ESDHC_SYSTEM_CONTROL);
sys_ctrl |= ESDHC_SYS_CTRL_RESET_TUNING;
writel(sys_ctrl, host->ioaddr + ESDHC_SYSTEM_CONTROL);
ctrl = readl(host->ioaddr + SDHCI_AUTO_CMD_STATUS);
ctrl &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
ctrl &= ~ESDHC_MIX_CTRL_EXE_TUNE;
writel(ctrl, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
/* Make sure ESDHC_MIX_CTRL_EXE_TUNE cleared */
ret = readl_poll_timeout(host->ioaddr + SDHCI_AUTO_CMD_STATUS,
ctrl, !(ctrl & ESDHC_MIX_CTRL_EXE_TUNE), 1 , 50 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc),
"Warning! clear execute tuning bit failed\n" );
/*
* SDHCI_INT_DATA_AVAIL is W1C bit , set this bit will clear the
* usdhc IP internal logic flag execute_tuning_with_clr_buf , which
* will finally make sure the normal data transfer logic correct .
*/
ctrl = readl(host->ioaddr + SDHCI_INT_STATUS);
ctrl |= SDHCI_INT_DATA_AVAIL;
writel(ctrl, host->ioaddr + SDHCI_INT_STATUS);
}
}
}
static void usdhc_init_card(struct mmc_host *mmc, struct mmc_card *card)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
imx_data->init_card_type = card->type;
}
static int usdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
int err;
/*
* 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 ;
/*
* Reset tuning circuit logic . If not , the previous tuning result
* will impact current tuning , make current tuning can ' t set the
* correct delay cell .
*/
esdhc_reset_tuning(host);
err = sdhci_execute_tuning(mmc, opcode);
/* If tuning done, enable auto tuning */
if (!err && !host->tuning_err)
usdhc_auto_tuning_mode_sel_and_en(host);
return err;
}
static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
{
u32 reg, sys_ctrl;
u8 sw_rst;
int ret;
/* FIXME: delay a bit for card to be ready for next tuning due to errors */
mdelay(1 );
/* IC suggest to reset USDHC before every tuning command */
esdhc_clrset_le(host, 0 xff, SDHCI_RESET_ALL, SDHCI_SOFTWARE_RESET);
ret = readb_poll_timeout(host->ioaddr + SDHCI_SOFTWARE_RESET, sw_rst,
!(sw_rst & SDHCI_RESET_ALL), 10 , 100 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc),
"warning! RESET_ALL never complete before sending tuning command\n" );
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
writel(FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_PRE_MASK, val),
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));
/* set RST_FIFO to reset the async FIFO, and wat it to self-clear */
sys_ctrl = readl(host->ioaddr + ESDHC_SYSTEM_CONTROL);
sys_ctrl |= ESDHC_SYS_CTRL_RST_FIFO;
writel(sys_ctrl, host->ioaddr + ESDHC_SYSTEM_CONTROL);
ret = readl_poll_timeout(host->ioaddr + ESDHC_SYSTEM_CONTROL, sys_ctrl,
!(sys_ctrl & ESDHC_SYS_CTRL_RST_FIFO), 10 , 100 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc),
"warning! RST_FIFO not clear in 100us\n" );
}
static void esdhc_post_tuning(struct sdhci_host *host)
{
u32 reg;
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg &= ~ESDHC_MIX_CTRL_EXE_TUNE;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
}
/*
* find the largest pass window , and use the average delay of this
* largest window to get the best timing .
*/
static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
{
int min, max, avg, ret;
int win_length, target_min, target_max, target_win_length;
u32 clk_tune_ctrl_status, temp;
min = target_min = ESDHC_TUNE_CTRL_MIN;
max = target_max = ESDHC_TUNE_CTRL_MIN;
target_win_length = 0 ;
while (max < ESDHC_TUNE_CTRL_MAX) {
/* find the mininum delay first which can pass tuning */
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;
}
win_length = max - min + 1 ;
/* get the largest pass window */
if (win_length > target_win_length) {
target_win_length = win_length;
target_min = min;
target_max = max;
}
/* continue to find the next pass window */
min = max + ESDHC_TUNE_CTRL_STEP;
}
/* use average delay to get the best timing */
avg = (target_min + target_max) / 2 ;
esdhc_prepare_tuning(host, avg);
/*
* adjust the delay according to tuning window , make preparation
* for the auto - tuning logic . According to hardware suggest , need
* to config the auto tuning window width to 3 , to make the auto
* tuning logic have enough space to handle the sample point shift
* caused by temperature change .
*/
clk_tune_ctrl_status = FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_PRE_MASK,
avg - ESDHC_AUTO_TUNING_WINDOW) |
FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_OUT_MASK,
ESDHC_AUTO_TUNING_WINDOW) |
FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_POST_MASK,
ESDHC_AUTO_TUNING_WINDOW);
writel(clk_tune_ctrl_status, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
ret = readl_poll_timeout(host->ioaddr + ESDHC_TUNE_CTRL_STATUS, temp,
clk_tune_ctrl_status ==
FIELD_GET(ESDHC_TUNE_CTRL_STATUS_TAP_SEL_MASK, temp),
1 , 10 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc),
"clock tuning control status not set in 10us\n" );
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)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
u32 strobe_delay;
u32 v;
int ret;
/* disable clock before enabling strobe dll */
writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
host->ioaddr + ESDHC_VENDOR_SPEC);
esdhc_wait_for_card_clock_gate_off(host);
/* 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
*/
if (imx_data->boarddata.strobe_dll_delay_target)
strobe_delay = imx_data->boarddata.strobe_dll_delay_target;
else
strobe_delay = ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT;
v = ESDHC_STROBE_DLL_CTRL_ENABLE |
ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT |
(strobe_delay << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
/* wait max 50us to get the REF/SLV lock */
ret = readl_poll_timeout(host->ioaddr + ESDHC_STROBE_DLL_STATUS, v,
((v & ESDHC_STROBE_DLL_STS_REF_LOCK) && (v & ESDHC_STROBE_DLL_STS_SLV_LOCK)), 1 , 50 );
if (ret == -ETIMEDOUT)
dev_warn(mmc_dev(host->mmc),
"warning! HS400 strobe DLL status REF/SLV not lock in 50us, STROBE DLL status is %x!\n" , v);
}
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 ;
}
if (!(imx_data->socdata->flags & ESDHC_FLAG_DUMMY_PAD) &&
(timing == MMC_TIMING_UHS_SDR104 ||
timing == MMC_TIMING_MMC_HS200 ||
timing == MMC_TIMING_MMC_HS400))
m |= ESDHC_MIX_CTRL_FBCLK_SEL;
else
m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
esdhc_change_pinstate(host, timing);
}
static void esdhc_reset(struct sdhci_host *host, u8 mask)
{
sdhci_and_cqhci_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 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 void esdhc_hw_reset(struct sdhci_host *host)
{
esdhc_clrset_le(host, ESDHC_SYS_CTRL_IPP_RST_N, 0 , ESDHC_SYSTEM_CONTROL);
/* eMMC spec requires minimum 1us, here delay between 1-10us */
usleep_range(1 , 10 );
esdhc_clrset_le(host, ESDHC_SYS_CTRL_IPP_RST_N,
ESDHC_SYS_CTRL_IPP_RST_N, ESDHC_SYSTEM_CONTROL);
/* eMMC spec requires minimum 200us, here delay between 200-300us */
usleep_range(200 , 300 );
}
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_bus_width = esdhc_pltfm_set_bus_width,
.set_uhs_signaling = esdhc_set_uhs_signaling,
.reset = esdhc_reset,
.irq = esdhc_cqhci_irq,
.dump_vendor_regs = esdhc_dump_debug_regs,
.hw_reset = esdhc_hw_reset,
};
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);
struct cqhci_host *cq_host = host->mmc->cqe_private;
u32 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
*/
if (!(imx_data->socdata->flags & ESDHC_FLAG_SKIP_ERR004536)) {
writel(readl(host->ioaddr + 0 x6c) & ~BIT(7 ),
host->ioaddr + 0 x6c);
}
/* disable DLL_CTRL delay line settings */
writel(0 x0, 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;
/*
* ROM code or bootloader may config the start tap
* and step , unmask them first .
*/
tmp &= ~(ESDHC_TUNING_START_TAP_MASK | ESDHC_TUNING_STEP_MASK);
if (imx_data->boarddata.tuning_start_tap)
tmp |= imx_data->boarddata.tuning_start_tap;
else
tmp |= ESDHC_TUNING_START_TAP_DEFAULT;
if (imx_data->boarddata.tuning_step) {
tmp |= imx_data->boarddata.tuning_step
<< ESDHC_TUNING_STEP_SHIFT;
} else {
tmp |= ESDHC_TUNING_STEP_DEFAULT
<< ESDHC_TUNING_STEP_SHIFT;
}
/*
* Config the tuning window to the hardware suggested value 3 .
* This tuning window is used for auto tuning logic . The default
* tuning window is 2 , here change to 3 make the window a bit
* wider , give auto tuning enough space to handle the sample
* point shift cause by temperature change .
*/
tmp &= ~ESDHC_TUNING_WINDOW_MASK;
tmp |= FIELD_PREP(ESDHC_TUNING_WINDOW_MASK, ESDHC_AUTO_TUNING_WINDOW);
/* Disable the CMD CRC check for tuning, if not, need to
* add some delay after every tuning command , because
* hardware standard tuning logic will directly go to next
* step once it detect the CMD CRC error , will not wait for
* the card side to finally send out the tuning data , trigger
* the buffer read ready interrupt immediately . If usdhc send
* the next tuning command some eMMC card will stuck , can ' t
* response , block the tuning procedure or the first command
* after the whole tuning procedure always can ' t get any response .
*/
tmp |= ESDHC_TUNING_CMD_CRC_CHECK_DISABLE;
writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
} else if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
/*
* ESDHC_STD_TUNING_EN may be configured 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);
}
/*
* On i . MX8MM , we are running Dual Linux OS , with 1 st Linux using SD Card
* as rootfs storage , 2 nd Linux using eMMC as rootfs storage . We let
* the 1 st linux configure power / clock for the 2 nd Linux .
*
* When the 2 nd Linux is booting into rootfs stage , we let the 1 st Linux
* to destroy the 2 nd linux , then restart the 2 nd linux , we met SDHCI dump .
* After we clear the pending interrupt and halt CQCTL , issue gone .
*/
if (cq_host) {
tmp = cqhci_readl(cq_host, CQHCI_IS);
cqhci_writel(cq_host, tmp, CQHCI_IS);
cqhci_writel(cq_host, CQHCI_HALT, CQHCI_CTL);
}
}
}
#ifdef CONFIG_PM_SLEEP
static void sdhc_esdhc_tuning_save(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 reg;
/*
* SD / eMMC do not need this tuning save because it will re - init
* after system resume back .
* Here save the tuning delay value for SDIO device since it may
* keep power during system PM . And for usdhc , only SDR50 and
* SDR104 mode for SDIO device need to do tuning , and need to
* save / restore .
*/
if (host->timing == MMC_TIMING_UHS_SDR50 ||
host->timing == MMC_TIMING_UHS_SDR104) {
reg = readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
reg = FIELD_GET(ESDHC_TUNE_CTRL_STATUS_TAP_SEL_PRE_MASK, reg);
imx_data->boarddata.saved_tuning_delay_cell = reg;
}
}
static void sdhc_esdhc_tuning_restore(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 reg;
if (host->timing == MMC_TIMING_UHS_SDR50 ||
host->timing == MMC_TIMING_UHS_SDR104) {
/*
* restore the tuning delay value actually is a
* manual tuning method , so clear the standard
* tuning enable bit here . Will set back this
* ESDHC_STD_TUNING_EN in esdhc_reset_tuning ( )
* when trigger re - tuning .
*/
reg = readl(host->ioaddr + ESDHC_TUNING_CTRL);
reg &= ~ESDHC_STD_TUNING_EN;
writel(reg, host->ioaddr + ESDHC_TUNING_CTRL);
reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
reg |= ESDHC_MIX_CTRL_SMPCLK_SEL;
if (!(imx_data->socdata->flags & ESDHC_FLAG_DUMMY_PAD))
reg |= ESDHC_MIX_CTRL_FBCLK_SEL;
writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
writel(FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_PRE_MASK,
imx_data->boarddata.saved_tuning_delay_cell) |
FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_OUT_MASK,
ESDHC_AUTO_TUNING_WINDOW) |
FIELD_PREP(ESDHC_TUNE_CTRL_STATUS_DLY_CELL_SET_POST_MASK,
ESDHC_AUTO_TUNING_WINDOW),
host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
}
}
#endif
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,
};
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_property_read_bool(np, "fsl,wp-controller" ))
boarddata->wp_type = ESDHC_WP_CONTROLLER;
/*
* If we have this property , then activate WP check .
* Retrieving and requesting the actual WP GPIO will happen
* in the call to mmc_of_parse ( ) .
*/
if (of_property_present(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);
of_property_read_u32(np, "fsl,strobe-dll-delay-target" ,
&boarddata->strobe_dll_delay_target);
if (of_property_read_bool(np, "no-1-8-v" ))
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(host->mmc, &host->ocr_mask);
if (esdhc_is_usdhc(imx_data) && !IS_ERR(imx_data->pinctrl)) {
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;
/* HS400/HS400ES require 8 bit bus */
if (!(host->mmc->caps & MMC_CAP_8_BIT_DATA))
host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES);
if (mmc_gpio_get_cd(host->mmc) >= 0 )
host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
return 0 ;
}
static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
{
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 = device_get_match_data(&pdev->dev);
host->quirks |= imx_data->socdata->quirks;
if (imx_data->socdata->flags & ESDHC_FLAG_PMQOS)
cpu_latency_qos_add_request(&imx_data->pm_qos_req, 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;
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;
pltfm_host->clock = clk_get_rate(pltfm_host->clk);
if (!pltfm_host->clock) {
dev_err(mmc_dev(host->mmc), "could not get clk rate\n" );
err = -EINVAL;
goto disable_ahb_clk;
}
imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(imx_data->pinctrl))
dev_warn(mmc_dev(host->mmc), "could not get pinctrl\n" );
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;
/* GPIO CD can be set as a wakeup source */
if (!(imx_data->socdata->flags & ESDHC_FLAG_SKIP_CD_WAKE))
host->mmc->caps |= MMC_CAP_CD_WAKE;
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(0 x0, host->ioaddr + ESDHC_MIX_CTRL);
writel(0 x0, host->ioaddr + SDHCI_AUTO_CMD_STATUS);
writel(0 x0, 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;
/*
* Link usdhc specific mmc_host_ops init card function ,
* to distinguish the card type .
*/
host->mmc_host_ops.init_card = usdhc_init_card;
host->max_timeout_count = 0 xF;
}
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->mmc->caps2 |= MMC_CAP2_HS400;
if (imx_data->socdata->flags & ESDHC_FLAG_BROKEN_AUTO_CMD23)
host->quirks2 |= SDHCI_QUIRK2_ACMD23_BROKEN;
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;
}
err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
if (err)
goto disable_ahb_clk;
sdhci_esdhc_imx_hwinit(host);
err = sdhci_add_host(host);
if (err)
goto disable_ahb_clk;
/*
* Setup the wakeup capability here , let user to decide
* whether need to enable this wakeup through sysfs interface .
*/
if ((host->mmc->pm_caps & MMC_PM_KEEP_POWER) &&
(host->mmc->pm_caps & MMC_PM_WAKE_SDIO_IRQ))
device_set_wakeup_capable(&pdev->dev, true );
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)
cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
return err;
}
static void 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;
pm_runtime_get_sync(&pdev->dev);
dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0 xffffffff);
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)
cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
}
#ifdef CONFIG_PM_SLEEP
static int sdhci_esdhc_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;
/*
* Switch to runtime resume for two reasons :
* 1 , there is register access ( e . g . , wakeup control register ) , so
* need to make sure gate on ipg clock .
* 2 , make sure the pm_runtime_force_resume ( ) in sdhci_esdhc_resume ( ) really
* invoke its - > runtime_resume callback ( needs_force_resume = 1 ) .
*/
pm_runtime_get_sync(dev);
if ((imx_data->socdata->flags & ESDHC_FLAG_STATE_LOST_IN_LPMODE) &&
(host->tuning_mode != SDHCI_TUNING_MODE_1)) {
mmc_retune_timer_stop(host->mmc);
mmc_retune_needed(host->mmc);
}
/*
* For the device need to keep power during system PM , need
* to save the tuning delay value just in case the usdhc
* lost power during system PM .
*/
if (mmc_card_keep_power(host->mmc) && mmc_card_wake_sdio_irq(host->mmc) &&
esdhc_is_usdhc(imx_data))
sdhc_esdhc_tuning_save(host);
if (device_may_wakeup(dev)) {
/* The irqs of imx are not shared. It is safe to disable */
disable_irq(host->irq);
ret = sdhci_enable_irq_wakeups(host);
if (!ret)
dev_warn(dev, "Failed to enable irq wakeup\n" );
} else {
/*
* For the device which works as wakeup source , no need
* to change the pinctrl to sleep state .
* e . g . For SDIO device , the interrupt share with data pin ,
* but the pinctrl sleep state may config the data pin to
* other function like GPIO function to save power in PM ,
* which finally block the SDIO wakeup function .
*/
ret = pinctrl_pm_select_sleep_state(dev);
if (ret)
return ret;
}
ret = mmc_gpio_set_cd_wake(host->mmc, true );
/*
* Make sure invoke runtime_suspend to gate off clock .
* uSDHC IP supports in - band SDIO wakeup even without clock .
*/
pm_runtime_force_suspend(dev);
return ret;
}
static int sdhci_esdhc_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 ret;
pm_runtime_force_resume(dev);
ret = mmc_gpio_set_cd_wake(host->mmc, false );
if (ret)
return ret;
/* re-initialize hw state in case it's lost in low power mode */
sdhci_esdhc_imx_hwinit(host);
if (host->irq_wake_enabled) {
sdhci_disable_irq_wakeups(host);
enable_irq(host->irq);
}
/*
* restore the saved tuning delay value for the device which keep
* power during system PM .
*/
if (mmc_card_keep_power(host->mmc) && mmc_card_wake_sdio_irq(host->mmc) &&
esdhc_is_usdhc(imx_data))
sdhc_esdhc_tuning_restore(host);
pm_runtime_put_autosuspend(dev);
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;
}
sdhci_runtime_suspend_host(host);
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)
cpu_latency_qos_remove_request(&imx_data->pm_qos_req);
return 0 ;
}
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)
cpu_latency_qos_add_request(&imx_data->pm_qos_req, 0 );
if (imx_data->socdata->flags & ESDHC_FLAG_CLK_RATE_LOST_IN_PM_RUNTIME)
clk_set_rate(imx_data->clk_per, pltfm_host->clock);
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);
sdhci_runtime_resume_host(host, 0 );
if (host->mmc->caps2 & MMC_CAP2_CQE)
err = cqhci_resume(host->mmc);
return err;
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)
cpu_latency_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" ,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = imx_esdhc_dt_ids,
.pm = &sdhci_esdhc_pmops,
},
.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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