diff options
| author | Faiz Abbas <faiz_abbas@ti.com> | 2021-02-04 15:10:46 +0530 |
|---|---|---|
| committer | Lokesh Vutla <lokeshvutla@ti.com> | 2021-02-04 20:37:57 +0530 |
| commit | 43392b550e56b52274398763329f35d54109d291 (patch) | |
| tree | f98a6bf95bcabee89bcc728b6ca56eaf5240fb5d /drivers/mmc | |
| parent | bfefa3a4eb6d5a1893d6c613a53c1706b630216e (diff) | |
| download | u-boot-43392b550e56b52274398763329f35d54109d291.tar.gz u-boot-43392b550e56b52274398763329f35d54109d291.tar.xz u-boot-43392b550e56b52274398763329f35d54109d291.zip | |
mmc: sdhci: Add helper functions for UHS modes
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_abbas@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/sdhci.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 0628934312..ed0dc17325 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 +510,100 @@ 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 + if (IS_SD(mmc)) { + ctrl &= ~SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + } + + /* Wait for 5ms */ + mdelay(5); + + /* 3.3V regulator output should be stable within 5 ms */ + if (IS_SD(mmc)) { + if (ctrl & SDHCI_CTRL_VDD_180) { + pr_err("3.3V regulator output did not become stable\n"); + return; + } + } + + 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); + } + + /* Wait for 5 ms */ + mdelay(5); + + /* 1.8V regulator output has to be stable within 5 ms */ + if (IS_SD(mmc)) { + if (!(ctrl & SDHCI_CTRL_VDD_180)) { + pr_err("1.8V regulator output did not become stable\n"); + return; + } + } + + 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) { |