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mmc: Enable signal voltage to be selected from mmc core

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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: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2017-09-21 16:30:00 +02:00 committed by Jaehoon Chung
parent 2a4d212f71
commit aff5d3c83f
2 changed files with 24 additions and 0 deletions
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16
drivers/mmc/mmc.c
View File

@ -30,6 +30,8 @@ static const unsigned int sd_au_size[] = {
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;
struct mmc *find_mmc_device(int dev_num)
@ -1257,6 +1259,12 @@ 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,
@ -1964,6 +1972,14 @@ 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);

8
include/mmc.h
View File

@ -272,6 +272,13 @@
#define ENHNCD_SUPPORT (0x2)
#define PART_ENH_ATTRIB (0x1f)
enum mmc_voltage {
MMC_SIGNAL_VOLTAGE_000 = 0,
MMC_SIGNAL_VOLTAGE_120,
MMC_SIGNAL_VOLTAGE_180,
MMC_SIGNAL_VOLTAGE_330
};
/* Maximum block size for MMC */
#define MMC_MAX_BLOCK_LEN 512
@ -457,6 +464,7 @@ struct mmc {
int high_capacity;
uint bus_width;
uint clock;
enum mmc_voltage signal_voltage;
uint card_caps;
uint ocr;
uint dsr;