mmc: omap_hsmmc: add signal voltage selection support
I/O data lines of UHS SD card operates at 1.8V when in UHS speed
mode (same is true for eMMC in DDR and HS200 modes). Add support
to switch signal voltage to 1.8V in order to support
UHS cards and eMMC HS200 and DDR modes.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/arch/arm/include/asm/omap_mmc.h b/arch/arm/include/asm/omap_mmc.h
index c50087e..c6129c5 100644
--- a/arch/arm/include/asm/omap_mmc.h
+++ b/arch/arm/include/asm/omap_mmc.h
@@ -172,10 +172,6 @@
#define VS30_3V0SUP BIT(25)
#define VS18_1V8SUP BIT(26)
-#define IOV_3V3 3300000
-#define IOV_3V0 3000000
-#define IOV_1V8 1800000
-
#define AC12_ET BIT(22)
#define AC12_V1V8_SIGEN BIT(19)
#define AC12_SCLK_SEL BIT(23)
@@ -224,6 +220,12 @@
IE_DTO | IE_CIE | IE_CEB | IE_CCRC | IE_ADMAE | IE_CTO |\
IE_BRR | IE_BWR | IE_TC | IE_CC)
+#define CON_CLKEXTFREE BIT(16)
+#define CON_PADEN BIT(15)
+#define PSTATE_CLEV BIT(24)
+#define PSTATE_DLEV (0xF << 20)
+#define PSTATE_DLEV_DAT0 (0x1 << 20)
+
int omap_mmc_init(int dev_index, uint host_caps_mask, uint f_max, int cd_gpio,
int wp_gpio);
diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index 0e80420..24027f2 100644
--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -78,6 +78,7 @@
#endif
uint bus_width;
uint clock;
+ ushort last_cmd;
#ifdef OMAP_HSMMC_USE_GPIO
#if CONFIG_IS_ENABLED(DM_MMC)
struct gpio_desc cd_gpio; /* Change Detect GPIO */
@@ -89,7 +90,6 @@
#endif
#endif
#if CONFIG_IS_ENABLED(DM_MMC)
- uint iov;
enum bus_mode mode;
#endif
u8 controller_flags;
@@ -98,6 +98,8 @@
uint desc_slot;
#endif
const char *hw_rev;
+ struct udevice *pbias_supply;
+ uint signal_voltage;
#ifdef CONFIG_IODELAY_RECALIBRATION
struct omap_hsmmc_pinctrl_state *default_pinctrl_state;
struct omap_hsmmc_pinctrl_state *hs_pinctrl_state;
@@ -254,7 +256,8 @@
&prcm_base->iclken1_core);
#endif
-#if defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)
+#if (defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)) &&\
+ !CONFIG_IS_ENABLED(DM_REGULATOR)
/* PBIAS config needed for MMC1 only */
if (mmc_get_blk_desc(mmc)->devnum == 0)
vmmc_pbias_config(LDO_VOLT_3V0);
@@ -398,32 +401,148 @@
omap_hsmmc_start_clock(mmc_base);
}
-static void omap_hsmmc_conf_bus_power(struct mmc *mmc)
+static void omap_hsmmc_conf_bus_power(struct mmc *mmc, uint signal_voltage)
{
struct hsmmc *mmc_base;
struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
- u32 val;
+ u32 hctl, ac12;
mmc_base = priv->base_addr;
- val = readl(&mmc_base->hctl) & ~SDVS_MASK;
+ hctl = readl(&mmc_base->hctl) & ~SDVS_MASK;
+ ac12 = readl(&mmc_base->ac12) & ~AC12_V1V8_SIGEN;
- switch (priv->iov) {
- case IOV_3V3:
- val |= SDVS_3V3;
+ switch (signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ hctl |= SDVS_3V0;
break;
- case IOV_3V0:
- val |= SDVS_3V0;
- break;
- case IOV_1V8:
- val |= SDVS_1V8;
+ case MMC_SIGNAL_VOLTAGE_180:
+ hctl |= SDVS_1V8;
+ ac12 |= AC12_V1V8_SIGEN;
break;
}
- writel(val, &mmc_base->hctl);
+ writel(hctl, &mmc_base->hctl);
+ writel(ac12, &mmc_base->ac12);
+}
+
+#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
+static int omap_hsmmc_wait_dat0(struct udevice *dev, int state, int timeout)
+{
+ int ret = -ETIMEDOUT;
+ u32 con;
+ bool dat0_high;
+ bool target_dat0_high = !!state;
+ struct omap_hsmmc_data *priv = dev_get_priv(dev);
+ struct hsmmc *mmc_base = priv->base_addr;
+
+ con = readl(&mmc_base->con);
+ writel(con | CON_CLKEXTFREE | CON_PADEN, &mmc_base->con);
+
+ timeout = DIV_ROUND_UP(timeout, 10); /* check every 10 us. */
+ while (timeout--) {
+ dat0_high = !!(readl(&mmc_base->pstate) & PSTATE_DLEV_DAT0);
+ if (dat0_high == target_dat0_high) {
+ ret = 0;
+ break;
+ }
+ udelay(10);
+ }
+ writel(con, &mmc_base->con);
+
+ return ret;
+}
+#endif
+
+#if CONFIG_IS_ENABLED(MMC_IO_VOLTAGE)
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+static int omap_hsmmc_set_io_regulator(struct mmc *mmc, int mV)
+{
+ int ret = 0;
+ int uV = mV * 1000;
+
+ struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
+
+ if (!mmc->vqmmc_supply)
+ return 0;
+
+ /* Disable PBIAS */
+ ret = regulator_set_enable(priv->pbias_supply, false);
+ if (ret && ret != -ENOSYS)
+ return ret;
+
+ /* Turn off IO voltage */
+ ret = regulator_set_enable(mmc->vqmmc_supply, false);
+ if (ret && ret != -ENOSYS)
+ return ret;
+ /* Program a new IO voltage value */
+ ret = regulator_set_value(mmc->vqmmc_supply, uV);
+ if (ret)
+ return ret;
+ /* Turn on IO voltage */
+ ret = regulator_set_enable(mmc->vqmmc_supply, true);
+ if (ret && ret != -ENOSYS)
+ return ret;
+
+ /* Program PBIAS voltage*/
+ ret = regulator_set_value(priv->pbias_supply, uV);
+ if (ret && ret != -ENOSYS)
+ return ret;
+ /* Enable PBIAS */
+ ret = regulator_set_enable(priv->pbias_supply, true);
+ if (ret && ret != -ENOSYS)
+ return ret;
+
+ return 0;
}
+#endif
-static void omap_hsmmc_set_capabilities(struct mmc *mmc)
+static int omap_hsmmc_set_signal_voltage(struct mmc *mmc)
+{
+ struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
+ struct hsmmc *mmc_base = priv->base_addr;
+ int mv = mmc_voltage_to_mv(mmc->signal_voltage);
+ u32 capa_mask;
+ __maybe_unused u8 palmas_ldo_volt;
+ u32 val;
+
+ if (mv < 0)
+ return -EINVAL;
+
+ if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
+ /* Use 3.0V rather than 3.3V */
+ mv = 3000;
+ capa_mask = VS30_3V0SUP;
+ palmas_ldo_volt = LDO_VOLT_3V0;
+ } else if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
+ capa_mask = VS18_1V8SUP;
+ palmas_ldo_volt = LDO_VOLT_1V8;
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ val = readl(&mmc_base->capa);
+ if (!(val & capa_mask))
+ return -EOPNOTSUPP;
+
+ priv->signal_voltage = mmc->signal_voltage;
+
+ omap_hsmmc_conf_bus_power(mmc, mmc->signal_voltage);
+
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ return omap_hsmmc_set_io_regulator(mmc, mv);
+#elif (defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)) && \
+ defined(CONFIG_PALMAS_POWER)
+ if (mmc_get_blk_desc(mmc)->devnum == 0)
+ vmmc_pbias_config(palmas_ldo_volt);
+ return 0;
+#else
+ return 0;
+#endif
+}
+#endif
+
+static uint32_t omap_hsmmc_set_capabilities(struct mmc *mmc)
{
struct hsmmc *mmc_base;
struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc);
@@ -434,18 +553,17 @@
if (priv->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
val |= (VS30_3V0SUP | VS18_1V8SUP);
- priv->iov = IOV_3V0;
} else if (priv->controller_flags & OMAP_HSMMC_NO_1_8_V) {
val |= VS30_3V0SUP;
val &= ~VS18_1V8SUP;
- priv->iov = IOV_3V0;
} else {
val |= VS18_1V8SUP;
val &= ~VS30_3V0SUP;
- priv->iov = IOV_1V8;
}
writel(val, &mmc_base->capa);
+
+ return val;
}
#ifdef MMC_SUPPORTS_TUNING
@@ -630,8 +748,9 @@
#endif
#if CONFIG_IS_ENABLED(DM_MMC)
- omap_hsmmc_set_capabilities(mmc);
- omap_hsmmc_conf_bus_power(mmc);
+ reg_val = omap_hsmmc_set_capabilities(mmc);
+ omap_hsmmc_conf_bus_power(mmc, (reg_val & VS30_3V0SUP) ?
+ MMC_SIGNAL_VOLTAGE_330 : MMC_SIGNAL_VOLTAGE_180);
#else
writel(DTW_1_BITMODE | SDBP_PWROFF | SDVS_3V0, &mmc_base->hctl);
writel(readl(&mmc_base->capa) | VS30_3V0SUP | VS18_1V8SUP,
@@ -842,6 +961,7 @@
struct hsmmc *mmc_base;
unsigned int flags, mmc_stat;
ulong start;
+ priv->last_cmd = cmd->cmdidx;
mmc_base = priv->base_addr;
@@ -1208,6 +1328,7 @@
struct mmc *mmc = upriv->mmc;
#endif
struct hsmmc *mmc_base = priv->base_addr;
+ int ret = 0;
if (priv->bus_width != mmc->bus_width)
omap_hsmmc_set_bus_width(mmc);
@@ -1223,8 +1344,13 @@
#if CONFIG_IS_ENABLED(DM_MMC)
if (priv->mode != mmc->selected_mode)
omap_hsmmc_set_timing(mmc);
+
+#if CONFIG_IS_ENABLED(MMC_IO_VOLTAGE)
+ if (priv->signal_voltage != mmc->signal_voltage)
+ ret = omap_hsmmc_set_signal_voltage(mmc);
#endif
- return 0;
+#endif
+ return ret;
}
#ifdef OMAP_HSMMC_USE_GPIO
@@ -1298,6 +1424,9 @@
.execute_tuning = omap_hsmmc_execute_tuning,
#endif
.send_init_stream = omap_hsmmc_send_init_stream,
+#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
+ .wait_dat0 = omap_hsmmc_wait_dat0,
+#endif
};
#else
static const struct mmc_ops omap_hsmmc_ops = {
@@ -1759,7 +1888,10 @@
if (mmc == NULL)
return -1;
#endif
-
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ device_get_supply_regulator(dev, "pbias-supply",
+ &priv->pbias_supply);
+#endif
#if defined(OMAP_HSMMC_USE_GPIO) && CONFIG_IS_ENABLED(OF_CONTROL)
gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
gpio_request_by_name(dev, "wp-gpios", 0, &priv->wp_gpio, GPIOD_IS_IN);