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Commit a05c8465 authored by Shawn Lin's avatar Shawn Lin Committed by Ulf Hansson
Browse files

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: default avatarShawn Lin <shawn.lin@rock-chips.com>

Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: default avatarDoug Anderson <dianders@chromium.org>
Tested-by: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent bc26235b

drivers/mmc/host/sdhci-of-arasan.c

+20 −0
Original line number Diff line number Diff line
@@ -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);