From: Faiz Abbas <faiz_ab...@ti.com>
Add a set_voltage() function which handles the switch from 3.3V to 1.8V
for SD card UHS modes.
Signed-off-by: Faiz Abbas <faiz_ab...@ti.com>
Signed-off-by: Aswath Govindraju <a-govindr...@ti.com>
---
drivers/mmc/sdhci.c | 73 +++++++++++++++++++++++++++++++++++++++++++++
include/sdhci.h | 10 +++++++
2 files changed, 83 insertions(+)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 06289343124e..276b6a08e571 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -20,6 +20,7 @@
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <phys2bus.h>
+#include <power/regulator.h>
static void sdhci_reset(struct sdhci_host *host, u8 mask)
{
@@ -509,6 +510,78 @@ void sdhci_set_uhs_timing(struct sdhci_host *host)
sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
}
+static void sdhci_set_voltage(struct sdhci_host *host)
+{
+ if (IS_ENABLED(CONFIG_MMC_IO_VOLTAGE)) {
+ struct mmc *mmc = (struct mmc *)host->mmc;
+ u32 ctrl;
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ switch (mmc->signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ if (mmc->vqmmc_supply) {
+ if
(regulator_set_enable_if_allowed(mmc->vqmmc_supply, false)) {
+ pr_err("failed to disable
vqmmc-supply\n");
+ return;
+ }
+
+ if (regulator_set_value(mmc->vqmmc_supply,
3300000)) {
+ pr_err("failed to set vqmmc-voltage to
3.3V\n");
+ return;
+ }
+
+ if
(regulator_set_enable_if_allowed(mmc->vqmmc_supply, true)) {
+ pr_err("failed to enable
vqmmc-supply\n");
+ return;
+ }
+ }
+#endif
+ /* 3.3V regulator output should be stable within 5 ms */
+ mdelay(5);
+ if (IS_SD(mmc)) {
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ }
+ break;
+ case MMC_SIGNAL_VOLTAGE_180:
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ if (mmc->vqmmc_supply) {
+ if
(regulator_set_enable_if_allowed(mmc->vqmmc_supply, false)) {
+ pr_err("failed to disable
vqmmc-supply\n");
+ return;
+ }
+
+ if (regulator_set_value(mmc->vqmmc_supply,
1800000)) {
+ pr_err("failed to set vqmmc-voltage to
1.8V\n");
+ return;
+ }
+
+ if
(regulator_set_enable_if_allowed(mmc->vqmmc_supply, true)) {
+ pr_err("failed to enable
vqmmc-supply\n");
+ return;
+ }
+ }
+#endif
+ if (IS_SD(mmc)) {
+ ctrl |= SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ }
+ break;
+ default:
+ /* No signal voltage switch required */
+ return;
+ }
+ }
+}
+
+void sdhci_set_control_reg(struct sdhci_host *host)
+{
+ sdhci_set_voltage(host);
+ sdhci_set_uhs_timing(host);
+}
+
#ifdef CONFIG_DM_MMC
static int sdhci_set_ios(struct udevice *dev)
{
diff --git a/include/sdhci.h b/include/sdhci.h
index 3e5a64981857..0ae9471ad749 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -491,6 +491,16 @@ void sdhci_set_uhs_timing(struct sdhci_host *host);
/* Export the operations to drivers */
int sdhci_probe(struct udevice *dev);
int sdhci_set_clock(struct mmc *mmc, unsigned int clock);
+
+/**
+ * sdhci_set_control_reg - Set control registers
+ *
+ * This is used set up control registers for voltage level and UHS speed
+ * mode.
+ *
+ * @host: SDHCI host structure
+ */
+void sdhci_set_control_reg(struct sdhci_host *host);
extern const struct dm_mmc_ops sdhci_ops;
#else
#endif
--
2.17.1
