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mmc: sdhci-of-arasan: implement enhanced strobe callback 

Currently sdhci-arasan 5.1 can support enhanced strobe function,
and we now limit it just for "arasan,sdhci-5.1". Add
mmc-hs400-enhanced-strobe in DT to enable the function if we're
sure our controller can support it.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-05-26 09:56:43 +08:00 committed by Ulf Hansson
parent bc26235bbd
commit a05c846511
1 changed files with 20 additions and 0 deletions
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20
drivers/mmc/host/sdhci-of-arasan.c
View File

@ -25,7 +25,9 @@
#include "sdhci-pltfm.h"
#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
#define VENDOR_ENHANCED_STROBE BIT(0)
#define CLK_CTRL_TIMEOUT_SHIFT 16
#define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
#define CLK_CTRL_TIMEOUT_MIN_EXP 13
@ -79,6 +81,21 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
}
}
static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
struct mmc_ios *ios)
{
u32 vendor;
struct sdhci_host *host = mmc_priv(mmc);
vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
if (ios->enhanced_strobe)
vendor |= VENDOR_ENHANCED_STROBE;
else
vendor &= ~VENDOR_ENHANCED_STROBE;
writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
}
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_arasan_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
@ -245,6 +262,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "phy_power_on err.\n");
goto err_phy_power;
}
host->mmc_host_ops.hs400_enhanced_strobe =
sdhci_arasan_hs400_enhanced_strobe;
}
ret = sdhci_add_host(host);