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mmc: sdhci: add hooks for setting UHS in platform specific code

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Allow platform specific code to set UHS registers if
implementation requires speciial platform specific handling

Signed-off-by: Philip Rakity <prakity@marvell.com>
Reviewed-by: Arindam Nath <arindam.nath@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Philip Rakity 2011-05-13 11:17:15 +05:30 committed by Chris Ball
parent a8e6df7343
commit 6322cdd0eb
2 changed files with 20 additions and 15 deletions
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17
drivers/mmc/host/sdhci.c
View File

@ -1346,8 +1346,16 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
sdhci_set_clock(host, clock);
}
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Reset SD Clock Enable */
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
clk &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
if (host->ops->set_uhs_signaling)
host->ops->set_uhs_signaling(host, ios->timing);
else {
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* Select Bus Speed Mode for host */
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
if (ios->timing == MMC_TIMING_UHS_SDR12)
@ -1360,13 +1368,8 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
else if (ios->timing == MMC_TIMING_UHS_DDR50)
ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
/* Reset SD Clock Enable */
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
clk &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
}
/* Re-enable SD Clock */
clock = host->clock;

2
drivers/mmc/host/sdhci.h
View File

@ -270,6 +270,8 @@ struct sdhci_ops {
unsigned int (*get_ro)(struct sdhci_host *host);
void (*platform_reset_enter)(struct sdhci_host *host, u8 mask);
void (*platform_reset_exit)(struct sdhci_host *host, u8 mask);
int (*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS