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mmc: fsl_esdhc: support SDR104 and HS200

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Introduce SDR104 and HS200 support
The implementation takes linux kernel sdhci.c and sdhci-esdhc-imx.c
as reference.
 - Implement esdhc_change_pinstate to dynamically change pad settings
 - Implement esdhc_set_timing
 - Implement esdhc_set_voltage to switch voltage
 - Implement fsl_esdhc_execute_tuning to execute time process
 - Enlarge the cfg->f_max to 200MHz.
 - Parse fsl,tuning-step, fsl,tuning-start-tap and
   fsl,strobe-dll-delay-target from device tree.
 - Parse no-1-8-v property
 - Introduce esdhc_soc_data to indicate the flags and caps

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
master
Peng Fan 7 years ago committed by Stefano Babic
parent 893d98d9aa
commit 51313b49f2
2 changed files with 405 additions and 5 deletions
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  1. 363
      drivers/mmc/fsl_esdhc.c
  2. 47
      include/fsl_esdhc.h

363
drivers/mmc/fsl_esdhc.c
Unescape View File

@ -23,6 +23,7 @@
#include <asm/io.h>
#include <dm.h>
#include <asm-generic/gpio.h>
#include <dm/pinctrl.h>
DECLARE_GLOBAL_DATA_PTR;
@ -32,6 +33,7 @@ DECLARE_GLOBAL_DATA_PTR;
IRQSTATEN_CIE | IRQSTATEN_DTOE | IRQSTATEN_DCE | \
IRQSTATEN_DEBE | IRQSTATEN_BRR | IRQSTATEN_BWR | \
IRQSTATEN_DINT)
#define MAX_TUNING_LOOP 40
struct fsl_esdhc {
uint dsaddr; /* SDMA system address register */
@ -90,6 +92,11 @@ struct fsl_esdhc_plat {
struct mmc mmc;
};
struct esdhc_soc_data {
u32 flags;
u32 caps;
};
/**
* struct fsl_esdhc_priv
*
@ -103,12 +110,20 @@ struct fsl_esdhc_plat {
* @non_removable: 0: removable; 1: non-removable
* @wp_enable: 1: enable checking wp; 0: no check
* @vs18_enable: 1: use 1.8V voltage; 0: use 3.3V
* @flags: ESDHC_FLAG_xx in include/fsl_esdhc.h
* @caps: controller capabilities
* @tuning_step: tuning step setting in tuning_ctrl register
* @start_tuning_tap: the start point for tuning in tuning_ctrl register
* @strobe_dll_delay_target: settings in strobe_dllctrl
* @signal_voltage: indicating the current voltage
* @cd_gpio: gpio for card detection
* @wp_gpio: gpio for write protection
*/
struct fsl_esdhc_priv {
struct fsl_esdhc *esdhc_regs;
unsigned int sdhc_clk;
unsigned int clock;
unsigned int mode;
unsigned int bus_width;
#if !CONFIG_IS_ENABLED(BLK)
struct mmc *mmc;
@ -117,6 +132,16 @@ struct fsl_esdhc_priv {
int non_removable;
int wp_enable;
int vs18_enable;
u32 flags;
u32 caps;
u32 tuning_step;
u32 tuning_start_tap;
u32 strobe_dll_delay_target;
u32 signal_voltage;
#if IS_ENABLED(CONFIG_DM_REGULATOR)
struct udevice *vqmmc_dev;
struct udevice *vmmc_dev;
#endif
#ifdef CONFIG_DM_GPIO
struct gpio_desc cd_gpio;
struct gpio_desc wp_gpio;
@ -368,6 +393,7 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
int err = 0;
uint xfertyp;
uint irqstat;
u32 flags = IRQSTAT_CC | IRQSTAT_CTOE;
struct fsl_esdhc *regs = priv->esdhc_regs;
#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC111
@ -421,8 +447,12 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
esdhc_write32(&regs->xfertyp, xfertyp);
#endif
if ((cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK) ||
(cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200))
flags = IRQSTAT_BRR;
/* Wait for the command to complete */
while (!(esdhc_read32(&regs->irqstat) & (IRQSTAT_CC | IRQSTAT_CTOE)))
while (!(esdhc_read32(&regs->irqstat) & flags))
;
irqstat = esdhc_read32(&regs->irqstat);
@ -484,6 +514,12 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
esdhc_pio_read_write(priv, data);
#else
flags = DATA_COMPLETE;
if ((cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK) ||
(cmd->cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200)) {
flags = IRQSTAT_BRR;
}
do {
irqstat = esdhc_read32(&regs->irqstat);
@ -496,7 +532,7 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
err = -ECOMM;
goto out;
}
} while ((irqstat & DATA_COMPLETE) != DATA_COMPLETE);
} while ((irqstat & flags) != flags);
/*
* Need invalidate the dcache here again to avoid any
@ -582,6 +618,7 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, struct mmc *mmc, uint clock)
esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_CKEN);
#endif
priv->clock = clock;
}
#ifdef CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK
@ -613,9 +650,239 @@ static void esdhc_clock_control(struct fsl_esdhc_priv *priv, bool enable)
}
#endif
#ifdef MMC_SUPPORTS_TUNING
static int esdhc_change_pinstate(struct udevice *dev)
{
struct fsl_esdhc_priv *priv = dev_get_priv(dev);
int ret;
switch (priv->mode) {
case UHS_SDR50:
case UHS_DDR50:
ret = pinctrl_select_state(dev, "state_100mhz");
break;
case UHS_SDR104:
case MMC_HS_200:
ret = pinctrl_select_state(dev, "state_200mhz");
break;
default:
ret = pinctrl_select_state(dev, "default");
break;
}
if (ret)
printf("%s %d error\n", __func__, priv->mode);
return ret;
}
static void esdhc_reset_tuning(struct mmc *mmc)
{
struct fsl_esdhc_priv *priv = dev_get_priv(mmc->dev);
struct fsl_esdhc *regs = priv->esdhc_regs;
if (priv->flags & ESDHC_FLAG_USDHC) {
if (priv->flags & ESDHC_FLAG_STD_TUNING) {
esdhc_clrbits32(&regs->autoc12err,
MIX_CTRL_SMPCLK_SEL |
MIX_CTRL_EXE_TUNE);
}
}
}
static int esdhc_set_timing(struct mmc *mmc)
{
struct fsl_esdhc_priv *priv = dev_get_priv(mmc->dev);
struct fsl_esdhc *regs = priv->esdhc_regs;
u32 mixctrl;
mixctrl = readl(&regs->mixctrl);
mixctrl &= ~(MIX_CTRL_DDREN | MIX_CTRL_HS400_EN);
switch (mmc->selected_mode) {
case MMC_LEGACY:
case SD_LEGACY:
esdhc_reset_tuning(mmc);
break;
case MMC_HS:
case MMC_HS_52:
case MMC_HS_200:
case SD_HS:
case UHS_SDR12:
case UHS_SDR25:
case UHS_SDR50:
case UHS_SDR104:
writel(mixctrl, &regs->mixctrl);
break;
case UHS_DDR50:
case MMC_DDR_52:
mixctrl |= MIX_CTRL_DDREN;
writel(mixctrl, &regs->mixctrl);
break;
default:
printf("Not supported %d\n", mmc->selected_mode);
return -EINVAL;
}
priv->mode = mmc->selected_mode;
return esdhc_change_pinstate(mmc->dev);
}
static int esdhc_set_voltage(struct mmc *mmc)
{
struct fsl_esdhc_priv *priv = dev_get_priv(mmc->dev);
struct fsl_esdhc *regs = priv->esdhc_regs;
int ret;
priv->signal_voltage = mmc->signal_voltage;
switch (mmc->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
if (priv->vs18_enable)
return -EIO;
#ifdef CONFIG_DM_REGULATOR
if (!IS_ERR_OR_NULL(priv->vqmmc_dev)) {
ret = regulator_set_value(priv->vqmmc_dev, 3300000);
if (ret) {
printf("Setting to 3.3V error");
return -EIO;
}
/* Wait for 5ms */
mdelay(5);
}
#endif
esdhc_clrbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
if (!(esdhc_read32(&regs->vendorspec) &
ESDHC_VENDORSPEC_VSELECT))
return 0;
return -EAGAIN;
case MMC_SIGNAL_VOLTAGE_180:
#ifdef CONFIG_DM_REGULATOR
if (!IS_ERR_OR_NULL(priv->vqmmc_dev)) {
ret = regulator_set_value(priv->vqmmc_dev, 1800000);
if (ret) {
printf("Setting to 1.8V error");
return -EIO;
}
}
#endif
esdhc_setbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
if (esdhc_read32(&regs->vendorspec) & ESDHC_VENDORSPEC_VSELECT)
return 0;
return -EAGAIN;
case MMC_SIGNAL_VOLTAGE_120:
return -ENOTSUPP;
default:
return 0;
}
}
static void esdhc_stop_tuning(struct mmc *mmc)
{
struct mmc_cmd cmd;
cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
cmd.cmdarg = 0;
cmd.resp_type = MMC_RSP_R1b;
dm_mmc_send_cmd(mmc->dev, &cmd, NULL);
}
static int fsl_esdhc_execute_tuning(struct udevice *dev, uint32_t opcode)
{
struct fsl_esdhc_plat *plat = dev_get_platdata(dev);
struct fsl_esdhc_priv *priv = dev_get_priv(dev);
struct fsl_esdhc *regs = priv->esdhc_regs;
struct mmc *mmc = &plat->mmc;
u32 irqstaten = readl(&regs->irqstaten);
u32 irqsigen = readl(&regs->irqsigen);
int i, ret = -ETIMEDOUT;
u32 val, mixctrl;
/* clock tuning is not needed for upto 52MHz */
if (mmc->clock <= 52000000)
return 0;
/* This is readw/writew SDHCI_HOST_CONTROL2 when tuning */
if (priv->flags & ESDHC_FLAG_STD_TUNING) {
val = readl(&regs->autoc12err);
mixctrl = readl(&regs->mixctrl);
val &= ~MIX_CTRL_SMPCLK_SEL;
mixctrl &= ~(MIX_CTRL_FBCLK_SEL | MIX_CTRL_AUTO_TUNE_EN);
val |= MIX_CTRL_EXE_TUNE;
mixctrl |= MIX_CTRL_FBCLK_SEL | MIX_CTRL_AUTO_TUNE_EN;
writel(val, &regs->autoc12err);
writel(mixctrl, &regs->mixctrl);
}
/* sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE); */
mixctrl = readl(&regs->mixctrl);
mixctrl = MIX_CTRL_DTDSEL_READ | (mixctrl & ~MIX_CTRL_SDHCI_MASK);
writel(mixctrl, &regs->mixctrl);
writel(IRQSTATEN_BRR, &regs->irqstaten);
writel(IRQSTATEN_BRR, &regs->irqsigen);
/*
* Issue opcode repeatedly till Execute Tuning is set to 0 or the number
* of loops reaches 40 times.
*/
for (i = 0; i < MAX_TUNING_LOOP; i++) {
u32 ctrl;
if (opcode == MMC_CMD_SEND_TUNING_BLOCK_HS200) {
if (mmc->bus_width == 8)
writel(0x7080, &regs->blkattr);
else if (mmc->bus_width == 4)
writel(0x7040, &regs->blkattr);
} else {
writel(0x7040, &regs->blkattr);
}
/* sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE) */
val = readl(&regs->mixctrl);
val = MIX_CTRL_DTDSEL_READ | (val & ~MIX_CTRL_SDHCI_MASK);
writel(val, &regs->mixctrl);
/* We are using STD tuning, no need to check return value */
mmc_send_tuning(mmc, opcode, NULL);
ctrl = readl(&regs->autoc12err);
if ((!(ctrl & MIX_CTRL_EXE_TUNE)) &&
(ctrl & MIX_CTRL_SMPCLK_SEL)) {
/*
* need to wait some time, make sure sd/mmc fininsh
* send out tuning data, otherwise, the sd/mmc can't
* response to any command when the card still out
* put the tuning data.
*/
mdelay(1);
ret = 0;
break;
}
/* Add 1ms delay for SD and eMMC */
mdelay(1);
}
writel(irqstaten, &regs->irqstaten);
writel(irqsigen, &regs->irqsigen);
esdhc_stop_tuning(mmc);
return ret;
}
#endif
static int esdhc_set_ios_common(struct fsl_esdhc_priv *priv, struct mmc *mmc)
{
struct fsl_esdhc *regs = priv->esdhc_regs;
int ret __maybe_unused;
#ifdef CONFIG_FSL_ESDHC_USE_PERIPHERAL_CLK
/* Select to use peripheral clock */
@ -624,7 +891,41 @@ static int esdhc_set_ios_common(struct fsl_esdhc_priv *priv, struct mmc *mmc)
esdhc_clock_control(priv, true);
#endif
/* Set the clock speed */
set_sysctl(priv, mmc, mmc->clock);
if (priv->clock != mmc->clock)
set_sysctl(priv, mmc, mmc->clock);
#ifdef MMC_SUPPORTS_TUNING
if (mmc->clk_disable) {
#ifdef CONFIG_FSL_USDHC
esdhc_clrbits32(&regs->vendorspec, VENDORSPEC_CKEN);
#else
esdhc_clrbits32(&regs->sysctl, SYSCTL_CKEN);
#endif
} else {
#ifdef CONFIG_FSL_USDHC
esdhc_setbits32(&regs->vendorspec, VENDORSPEC_PEREN |
VENDORSPEC_CKEN);
#else
esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_CKEN);
#endif
}
if (priv->mode != mmc->selected_mode) {
ret = esdhc_set_timing(mmc);
if (ret) {
printf("esdhc_set_timing error %d\n", ret);
return ret;
}
}
if (priv->signal_voltage != mmc->signal_voltage) {
ret = esdhc_set_voltage(mmc);
if (ret) {
printf("esdhc_set_voltage error %d\n", ret);
return ret;
}
}
#endif
/* Set the bus width */
esdhc_clrbits32(&regs->proctl, PROCTL_DTW_4 | PROCTL_DTW_8);
@ -799,6 +1100,10 @@ static int fsl_esdhc_init(struct fsl_esdhc_priv *priv,
#ifndef CONFIG_FSL_USDHC
esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_HCKEN
| SYSCTL_IPGEN | SYSCTL_CKEN);
/* Clearing tuning bits in case ROM has set it already */
esdhc_write32(&regs->mixctrl, 0);
esdhc_write32(&regs->autoc12err, 0);
esdhc_write32(&regs->clktunectrlstatus, 0);
#else
esdhc_setbits32(&regs->vendorspec, VENDORSPEC_PEREN |
VENDORSPEC_HCKEN | VENDORSPEC_IPGEN | VENDORSPEC_CKEN);
@ -872,11 +1177,27 @@ static int fsl_esdhc_init(struct fsl_esdhc_priv *priv,
cfg->host_caps &= ~MMC_MODE_8BIT;
#endif
cfg->host_caps |= priv->caps;
cfg->f_min = 400000;
cfg->f_max = min(priv->sdhc_clk, (u32)52000000);
cfg->f_max = min(priv->sdhc_clk, (u32)200000000);
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
writel(0, &regs->dllctrl);
if (priv->flags & ESDHC_FLAG_USDHC) {
if (priv->flags & ESDHC_FLAG_STD_TUNING) {
u32 val = readl(&regs->tuning_ctrl);
val |= ESDHC_STD_TUNING_EN;
val &= ~ESDHC_TUNING_START_TAP_MASK;
val |= priv->tuning_start_tap;
val &= ~ESDHC_TUNING_STEP_MASK;
val |= (priv->tuning_step) << ESDHC_TUNING_STEP_SHIFT;
writel(val, &regs->tuning_ctrl);
}
}
return 0;
}
@ -1035,6 +1356,10 @@ static int fsl_esdhc_probe(struct udevice *dev)
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct fsl_esdhc_plat *plat = dev_get_platdata(dev);
struct fsl_esdhc_priv *priv = dev_get_priv(dev);
const void *fdt = gd->fdt_blob;
int node = dev_of_offset(dev);
struct esdhc_soc_data *data =
(struct esdhc_soc_data *)dev_get_driver_data(dev);
#ifdef CONFIG_DM_REGULATOR
struct udevice *vqmmc_dev;
#endif
@ -1049,6 +1374,11 @@ static int fsl_esdhc_probe(struct udevice *dev)
priv->esdhc_regs = (struct fsl_esdhc *)addr;
priv->dev = dev;
priv->mode = -1;
if (data) {
priv->flags = data->flags;
priv->caps = data->caps;
}
val = dev_read_u32_default(dev, "bus-width", -1);
if (val == 8)
@ -1058,6 +1388,15 @@ static int fsl_esdhc_probe(struct udevice *dev)
else
priv->bus_width = 1;
val = fdtdec_get_int(fdt, node, "fsl,tuning-step", 1);
priv->tuning_step = val;
val = fdtdec_get_int(fdt, node, "fsl,tuning-start-tap",
ESDHC_TUNING_START_TAP_DEFAULT);
priv->tuning_start_tap = val;
val = fdtdec_get_int(fdt, node, "fsl,strobe-dll-delay-target",
ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT);
priv->strobe_dll_delay_target = val;
if (dev_read_bool(dev, "non-removable")) {
priv->non_removable = 1;
} else {
@ -1099,6 +1438,9 @@ static int fsl_esdhc_probe(struct udevice *dev)
}
#endif
if (fdt_get_property(fdt, node, "no-1-8-v", NULL))
priv->caps &= ~(UHS_CAPS | MMC_MODE_HS200);
/*
* TODO:
* Because lack of clk driver, if SDHC clk is not enabled,
@ -1171,15 +1513,26 @@ static const struct dm_mmc_ops fsl_esdhc_ops = {
.get_cd = fsl_esdhc_get_cd,
.send_cmd = fsl_esdhc_send_cmd,
.set_ios = fsl_esdhc_set_ios,
#ifdef MMC_SUPPORTS_TUNING
.execute_tuning = fsl_esdhc_execute_tuning,
#endif
};
#endif
static 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,
.caps = UHS_CAPS | MMC_MODE_HS200 | MMC_MODE_DDR_52MHz |
MMC_MODE_HS_52MHz | MMC_MODE_HS,
};
static const struct udevice_id fsl_esdhc_ids[] = {
{ .compatible = "fsl,imx6ul-usdhc", },
{ .compatible = "fsl,imx6sx-usdhc", },
{ .compatible = "fsl,imx6sl-usdhc", },
{ .compatible = "fsl,imx6q-usdhc", },
{ .compatible = "fsl,imx7d-usdhc", },
{ .compatible = "fsl,imx7d-usdhc", .data = (ulong)&usdhc_imx7d_data,},
{ .compatible = "fsl,imx7ulp-usdhc", },
{ .compatible = "fsl,esdhc", },
{ /* sentinel */ }

47
include/fsl_esdhc.h
Unescape View File

@ -10,6 +10,7 @@
#ifndef __FSL_ESDHC_H__
#define __FSL_ESDHC_H__
#include <linux/bitops.h>
#include <linux/errno.h>
#include <asm/byteorder.h>
@ -173,6 +174,52 @@
#define ESDHC_VENDORSPEC_VSELECT 0x00000002 /* Use 1.8V */
/* Imported from Linux Kernel drivers/mmc/host/sdhci-esdhc-imx.c */
#define MIX_CTRL_DDREN BIT(3)
#define MIX_CTRL_DTDSEL_READ BIT(4)
#define MIX_CTRL_AC23EN BIT(7)
#define MIX_CTRL_EXE_TUNE BIT(22)
#define MIX_CTRL_SMPCLK_SEL BIT(23)
#define MIX_CTRL_AUTO_TUNE_EN BIT(24)
#define MIX_CTRL_FBCLK_SEL BIT(25)
#define MIX_CTRL_HS400_EN BIT(26)
#define MIX_CTRL_HS400_ES BIT(27)
/* Bits 3 and 6 are not SDHCI standard definitions */
#define MIX_CTRL_SDHCI_MASK 0xb7
/* Tuning bits */
#define MIX_CTRL_TUNING_MASK 0x03c00000
/* strobe dll register */
#define ESDHC_STROBE_DLL_CTRL 0x70
#define ESDHC_STROBE_DLL_CTRL_ENABLE BIT(0)
#define ESDHC_STROBE_DLL_CTRL_RESET BIT(1)
#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT 0x7
#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3
#define ESDHC_STROBE_DLL_STATUS 0x74
#define ESDHC_STROBE_DLL_STS_REF_LOCK BIT(1)
#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0x1
#define ESDHC_STROBE_DLL_CLK_FREQ 100000000
#define ESDHC_STD_TUNING_EN BIT(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
#define ESDHC_FLAG_MULTIBLK_NO_INT BIT(1)
#define ESDHC_FLAG_ENGCM07207 BIT(2)
#define ESDHC_FLAG_USDHC BIT(3)
#define ESDHC_FLAG_MAN_TUNING BIT(4)
#define ESDHC_FLAG_STD_TUNING BIT(5)
#define ESDHC_FLAG_HAVE_CAP1 BIT(6)
#define ESDHC_FLAG_ERR004536 BIT(7)
#define ESDHC_FLAG_HS200 BIT(8)
#define ESDHC_FLAG_HS400 BIT(9)
#define ESDHC_FLAG_ERR010450 BIT(10)
#define ESDHC_FLAG_HS400_ES BIT(11)
struct fsl_esdhc_cfg {
phys_addr_t esdhc_base;
u32 sdhc_clk;

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