Commit 920adc57 authored by Kishon Vijay Abraham I's avatar Kishon Vijay Abraham I Committed by Jason Liu

mmc: Enable signal voltage to be selected from mmc core

Add a new function *mmc_set_signal_voltage* in mmc core
which can be used during mmc initialization to select the
signal voltage. Platform driver should use the set_ios
callback function to select the signal voltage.
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: default avatarJean-Jacques Hiblot <jjhiblot@ti.com>
parent 2bcfc012
......@@ -29,6 +29,7 @@ static const unsigned int sd_au_size[] = {
SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
};
static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);
#if CONFIG_IS_ENABLED(MMC_TINY)
static struct mmc mmc_static;
......@@ -1247,6 +1248,12 @@ struct mode_width_tuning {
uint widths;
};
static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
{
mmc->signal_voltage = signal_voltage;
return mmc_set_ios(mmc);
}
static const struct mode_width_tuning sd_modes_by_pref[] = {
{
.mode = SD_HS,
......@@ -1935,6 +1942,14 @@ int mmc_start_init(struct mmc *mmc)
return err;
#endif
mmc->ddr_mode = 0;
/* First try to set 3.3V. If it fails set to 1.8V */
err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_330);
if (err != 0)
err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_180);
if (err != 0)
printf("failed to set signal voltage\n");
mmc_set_bus_width(mmc, 1);
mmc_set_clock(mmc, 1);
......
......@@ -266,6 +266,10 @@
#define ENHNCD_SUPPORT (0x2)
#define PART_ENH_ATTRIB (0x1f)
#define MMC_SIGNAL_VOLTAGE_330 1
#define MMC_SIGNAL_VOLTAGE_180 2
#define MMC_SIGNAL_VOLTAGE_120 3
/* Maximum block size for MMC */
#define MMC_MAX_BLOCK_LEN 512
......@@ -452,6 +456,7 @@ struct mmc {
int high_capacity;
uint bus_width;
uint clock;
uint signal_voltage;
uint card_caps;
uint ocr;
uint dsr;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment