diff options
| -rw-r--r-- | arch/arm/include/asm/omap_mmc.h | 2 | ||||
| -rw-r--r-- | drivers/mmc/omap_hsmmc.c | 76 |
2 files changed, 54 insertions, 24 deletions
diff --git a/arch/arm/include/asm/omap_mmc.h b/arch/arm/include/asm/omap_mmc.h index bf9de9b..102aec2 100644 --- a/arch/arm/include/asm/omap_mmc.h +++ b/arch/arm/include/asm/omap_mmc.h @@ -172,6 +172,8 @@ struct omap_hsmmc_plat { #define CLK_400KHZ 1 #define CLK_MISC 2 +#define CLKD_MAX 0x3FF /* max clock divisor: 1023 */ + #define RSP_TYPE_NONE (RSP_TYPE_NORSP | CCCE_NOCHECK | CICE_NOCHECK) #define MMC_CMD0 (INDEX(0) | RSP_TYPE_NONE | DP_NO_DATA | DDIR_WRITE) diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index b12d6d9..fa8681a 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -62,6 +62,7 @@ struct omap_hsmmc_data { #if !CONFIG_IS_ENABLED(DM_MMC) struct mmc_config cfg; #endif + uint clock; #ifdef OMAP_HSMMC_USE_GPIO #if CONFIG_IS_ENABLED(DM_MMC) struct gpio_desc cd_gpio; /* Change Detect GPIO */ @@ -114,6 +115,8 @@ struct omap_hsmmc_adma_desc { static int mmc_read_data(struct hsmmc *mmc_base, char *buf, unsigned int size); static int mmc_write_data(struct hsmmc *mmc_base, const char *buf, unsigned int siz); +static void omap_hsmmc_start_clock(struct hsmmc *mmc_base); +static void omap_hsmmc_stop_clock(struct hsmmc *mmc_base); static inline struct omap_hsmmc_data *omap_hsmmc_get_data(struct mmc *mmc) { @@ -764,6 +767,53 @@ static int mmc_write_data(struct hsmmc *mmc_base, const char *buf, return 0; } +static void omap_hsmmc_stop_clock(struct hsmmc *mmc_base) +{ + writel(readl(&mmc_base->sysctl) & ~CEN_ENABLE, &mmc_base->sysctl); +} + +static void omap_hsmmc_start_clock(struct hsmmc *mmc_base) +{ + writel(readl(&mmc_base->sysctl) | CEN_ENABLE, &mmc_base->sysctl); +} + +static void omap_hsmmc_set_clock(struct mmc *mmc) +{ + struct omap_hsmmc_data *priv = omap_hsmmc_get_data(mmc); + struct hsmmc *mmc_base; + unsigned int dsor = 0; + ulong start; + + mmc_base = priv->base_addr; + omap_hsmmc_stop_clock(mmc_base); + + /* TODO: Is setting DTO required here? */ + mmc_reg_out(&mmc_base->sysctl, (ICE_MASK | DTO_MASK), + (ICE_STOP | DTO_15THDTO)); + + if (mmc->clock != 0) { + dsor = DIV_ROUND_UP(MMC_CLOCK_REFERENCE * 1000000, mmc->clock); + if (dsor > CLKD_MAX) + dsor = CLKD_MAX; + } else { + dsor = CLKD_MAX; + } + + mmc_reg_out(&mmc_base->sysctl, ICE_MASK | CLKD_MASK, + (dsor << CLKD_OFFSET) | ICE_OSCILLATE); + + start = get_timer(0); + while ((readl(&mmc_base->sysctl) & ICS_MASK) == ICS_NOTREADY) { + if (get_timer(0) - start > MAX_RETRY_MS) { + printf("%s: timedout waiting for ics!\n", __func__); + return; + } + } + + priv->clock = mmc->clock; + omap_hsmmc_start_clock(mmc_base); +} + #if !CONFIG_IS_ENABLED(DM_MMC) static int omap_hsmmc_set_ios(struct mmc *mmc) { @@ -776,8 +826,6 @@ static int omap_hsmmc_set_ios(struct udevice *dev) struct mmc *mmc = upriv->mmc; #endif struct hsmmc *mmc_base; - unsigned int dsor = 0; - ulong start; mmc_base = priv->base_addr; /* configue bus width */ @@ -803,28 +851,8 @@ static int omap_hsmmc_set_ios(struct udevice *dev) break; } - /* configure clock with 96Mhz system clock. - */ - if (mmc->clock != 0) { - dsor = (MMC_CLOCK_REFERENCE * 1000000 / mmc->clock); - if ((MMC_CLOCK_REFERENCE * 1000000) / dsor > mmc->clock) - dsor++; - } - - mmc_reg_out(&mmc_base->sysctl, (ICE_MASK | DTO_MASK | CEN_MASK), - (ICE_STOP | DTO_15THDTO)); - - mmc_reg_out(&mmc_base->sysctl, ICE_MASK | CLKD_MASK, - (dsor << CLKD_OFFSET) | ICE_OSCILLATE); - - start = get_timer(0); - while ((readl(&mmc_base->sysctl) & ICS_MASK) == ICS_NOTREADY) { - if (get_timer(0) - start > MAX_RETRY_MS) { - printf("%s: timedout waiting for ics!\n", __func__); - return -ETIMEDOUT; - } - } - writel(readl(&mmc_base->sysctl) | CEN_ENABLE, &mmc_base->sysctl); + if (priv->clock != mmc->clock) + omap_hsmmc_set_clock(mmc); return 0; } |