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@@ -20,6 +20,7 @@
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <phys2bus.h>
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+#include <power/regulator.h>
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static void sdhci_reset(struct sdhci_host *host, u8 mask)
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{
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@@ -509,6 +510,100 @@ void sdhci_set_uhs_timing(struct sdhci_host *host)
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sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
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}
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+static void sdhci_set_voltage(struct sdhci_host *host)
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+{
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+ if (IS_ENABLED(CONFIG_MMC_IO_VOLTAGE)) {
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+ struct mmc *mmc = (struct mmc *)host->mmc;
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+ u32 ctrl;
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+
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+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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+
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+ switch (mmc->signal_voltage) {
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+ case MMC_SIGNAL_VOLTAGE_330:
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+#if CONFIG_IS_ENABLED(DM_REGULATOR)
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+ if (mmc->vqmmc_supply) {
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+ if (regulator_set_enable_if_allowed(mmc->vqmmc_supply, false)) {
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+ pr_err("failed to disable vqmmc-supply\n");
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+ return;
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+ }
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+
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+ if (regulator_set_value(mmc->vqmmc_supply, 3300000)) {
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+ pr_err("failed to set vqmmc-voltage to 3.3V\n");
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+ return;
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+ }
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+
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+ if (regulator_set_enable_if_allowed(mmc->vqmmc_supply, true)) {
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+ pr_err("failed to enable vqmmc-supply\n");
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+ return;
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+ }
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+ }
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+#endif
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+ if (IS_SD(mmc)) {
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+ ctrl &= ~SDHCI_CTRL_VDD_180;
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+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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+ }
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+
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+ /* Wait for 5ms */
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+ mdelay(5);
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+
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+ /* 3.3V regulator output should be stable within 5 ms */
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+ if (IS_SD(mmc)) {
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+ if (ctrl & SDHCI_CTRL_VDD_180) {
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+ pr_err("3.3V regulator output did not become stable\n");
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+ return;
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+ }
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+ }
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+
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+ break;
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+ case MMC_SIGNAL_VOLTAGE_180:
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+#if CONFIG_IS_ENABLED(DM_REGULATOR)
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+ if (mmc->vqmmc_supply) {
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+ if (regulator_set_enable_if_allowed(mmc->vqmmc_supply, false)) {
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+ pr_err("failed to disable vqmmc-supply\n");
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+ return;
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+ }
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+
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+ if (regulator_set_value(mmc->vqmmc_supply, 1800000)) {
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+ pr_err("failed to set vqmmc-voltage to 1.8V\n");
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+ return;
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+ }
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+
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+ if (regulator_set_enable_if_allowed(mmc->vqmmc_supply, true)) {
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+ pr_err("failed to enable vqmmc-supply\n");
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+ return;
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+ }
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+ }
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+#endif
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+ if (IS_SD(mmc)) {
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+ ctrl |= SDHCI_CTRL_VDD_180;
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+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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+ }
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+
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+ /* Wait for 5 ms */
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+ mdelay(5);
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+
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+ /* 1.8V regulator output has to be stable within 5 ms */
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+ if (IS_SD(mmc)) {
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+ if (!(ctrl & SDHCI_CTRL_VDD_180)) {
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+ pr_err("1.8V regulator output did not become stable\n");
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+ return;
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+ }
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+ }
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+
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+ break;
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+ default:
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+ /* No signal voltage switch required */
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+ return;
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+ }
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+ }
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+}
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+
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+void sdhci_set_control_reg(struct sdhci_host *host)
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+{
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+ sdhci_set_voltage(host);
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+ sdhci_set_uhs_timing(host);
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+}
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+
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#ifdef CONFIG_DM_MMC
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static int sdhci_set_ios(struct udevice *dev)
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{
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