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@@ -22,6 +22,7 @@
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#include <linux/libfdt.h>
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#include <malloc.h>
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#include <sdhci.h>
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+#include <power/regulator.h>
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DECLARE_GLOBAL_DATA_PTR;
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@@ -42,6 +43,14 @@ DECLARE_GLOBAL_DATA_PTR;
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#define SDHC_SYS_EXT_OP_CTRL 0x010C
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#define MASK_CMD_CONFLICT_ERROR BIT(8)
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+#define SDHC_SLOT_EMMC_CTRL 0x0130
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+#define ENABLE_DATA_STROBE_SHIFT 24
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+#define SET_EMMC_RSTN_SHIFT 16
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+#define EMMC_VCCQ_MASK 0x3
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+#define EMMC_VCCQ_1_8V 0x1
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+#define EMMC_VCCQ_1_2V 0x2
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+#define EMMC_VCCQ_3_3V 0x3
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+
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#define SDHC_SLOT_RETUNING_REQ_CTRL 0x0144
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/* retuning compatible */
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#define RETUNING_COMPATIBLE 0x1
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@@ -108,6 +117,8 @@ DECLARE_GLOBAL_DATA_PTR;
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#define MMC_TIMING_MMC_HS400 10
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#define XENON_MMC_MAX_CLK 400000000
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+#define XENON_MMC_3V3_UV 3300000
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+#define XENON_MMC_1V8_UV 1800000
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enum soc_pad_ctrl_type {
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SOC_PAD_SD,
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@@ -128,6 +139,8 @@ struct xenon_sdhci_priv {
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void *pad_ctrl_reg;
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int pad_type;
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+
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+ struct udevice *vqmmc;
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};
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static int xenon_mmc_phy_init(struct sdhci_host *host)
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@@ -208,6 +221,51 @@ static void armada_3700_soc_pad_voltage_set(struct sdhci_host *host)
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writel(ARMADA_3700_SOC_PAD_3_3V, priv->pad_ctrl_reg);
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}
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+static int xenon_mmc_start_signal_voltage_switch(struct sdhci_host *host)
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+{
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+ struct xenon_sdhci_priv *priv = host->mmc->priv;
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+ u8 voltage;
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+ u32 ctrl;
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+ int ret = 0;
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+
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+ /* If there is no vqmmc regulator, return */
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+ if (!priv->vqmmc)
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+ return 0;
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+
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+ if (priv->pad_type == SOC_PAD_FIXED_1_8V) {
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+ /* Switch to 1.8v */
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+ ret = regulator_set_value(priv->vqmmc,
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+ XENON_MMC_1V8_UV);
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+ } else if (priv->pad_type == SOC_PAD_SD) {
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+ /* Get voltage info */
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+ voltage = sdhci_readb(host, SDHCI_POWER_CONTROL);
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+ voltage &= ~SDHCI_POWER_ON;
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+
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+ if (voltage == SDHCI_POWER_330) {
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+ /* Switch to 3.3v */
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+ ret = regulator_set_value(priv->vqmmc,
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+ XENON_MMC_3V3_UV);
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+ } else {
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+ /* Switch to 1.8v */
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+ ret = regulator_set_value(priv->vqmmc,
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+ XENON_MMC_1V8_UV);
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+ }
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+ }
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+
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+ /* Set VCCQ, eMMC mode: 1.8V; SD/SDIO mode: 3.3V */
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+ ctrl = sdhci_readl(host, SDHC_SLOT_EMMC_CTRL);
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+ if (IS_SD(host->mmc))
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+ ctrl |= EMMC_VCCQ_3_3V;
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+ else
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+ ctrl |= EMMC_VCCQ_1_8V;
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+ sdhci_writel(host, ctrl, SDHC_SLOT_EMMC_CTRL);
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+
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+ if (ret)
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+ printf("Signal voltage switch fail\n");
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+
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+ return ret;
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+}
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+
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static void xenon_mmc_phy_set(struct sdhci_host *host)
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{
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struct xenon_sdhci_priv *priv = host->mmc->priv;
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@@ -334,6 +392,13 @@ static int xenon_sdhci_set_ios_post(struct sdhci_host *host)
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uint speed = host->mmc->tran_speed;
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int pwr_18v = 0;
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+ /*
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+ * Signal Voltage Switching is only applicable for Host Controllers
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+ * v3.00 and above.
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+ */
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+ if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
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+ xenon_mmc_start_signal_voltage_switch(host);
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+
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if ((sdhci_readb(host, SDHCI_POWER_CONTROL) & ~SDHCI_POWER_ON) ==
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SDHCI_POWER_180)
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pwr_18v = 1;
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@@ -394,6 +459,18 @@ static int xenon_sdhci_probe(struct udevice *dev)
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/* Set default timing */
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priv->timing = MMC_TIMING_LEGACY;
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+ /* Get the vqmmc regulator if there is */
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+ device_get_supply_regulator(dev, "vqmmc-supply", &priv->vqmmc);
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+ /* Set the initial voltage value to 3.3V if there is regulator */
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+ if (priv->vqmmc) {
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+ ret = regulator_set_value(priv->vqmmc,
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+ XENON_MMC_3V3_UV);
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+ if (ret) {
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+ printf("Failed to set VQMMC regulator to 3.3V\n");
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+ return ret;
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+ }
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+ }
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+
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/* Disable auto clock gating during init */
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xenon_mmc_set_acg(host, false);
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@@ -426,7 +503,7 @@ static int xenon_sdhci_probe(struct udevice *dev)
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host->ops = &xenon_sdhci_ops;
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host->max_clk = XENON_MMC_MAX_CLK;
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- ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
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+ ret = sdhci_setup_cfg(&plat->cfg, host, XENON_MMC_MAX_CLK, 0);
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if (ret)
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return ret;
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