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Commit ba49cbd0 authored by yangbo lu's avatar yangbo lu Committed by Ulf Hansson
Browse files

mmc: sdhci-of-esdhc: add tuning support 



eSDHC uses tuning block for tuning procedure. So the tuning
block control register must be configured properly before tuning.

Signed-off-by: default avatarYangbo Lu <yangbo.lu@nxp.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent ea35645a

drivers/mmc/host/sdhci-esdhc.h

+5 −0
Original line number Diff line number Diff line
@@ -53,9 +53,14 @@ 
#define ESDHC_CLOCK_HCKEN		0x00000002

#define ESDHC_CLOCK_IPGEN		0x00000001



/* Tuning Block Control Register */

#define ESDHC_TBCTL			0x120

#define ESDHC_TB_EN			0x00000004



/* Control Register for DMA transfer */

#define ESDHC_DMA_SYSCTL		0x40c

#define ESDHC_PERIPHERAL_CLK_SEL	0x00080000

#define ESDHC_FLUSH_ASYNC_FIFO		0x00040000

#define ESDHC_DMA_SNOOP			0x00000040



#endif /* _DRIVERS_MMC_SDHCI_ESDHC_H */

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

+20 −0
Original line number Diff line number Diff line
@@ -631,6 +631,25 @@ static int esdhc_signal_voltage_switch(struct mmc_host *mmc, 
	}

}



static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)

{

	struct sdhci_host *host = mmc_priv(mmc);

	u32 val;



	/* Use tuning block for tuning procedure */

	esdhc_clock_enable(host, false);

	val = sdhci_readl(host, ESDHC_DMA_SYSCTL);

	val |= ESDHC_FLUSH_ASYNC_FIFO;

	sdhci_writel(host, val, ESDHC_DMA_SYSCTL);



	val = sdhci_readl(host, ESDHC_TBCTL);

	val |= ESDHC_TB_EN;

	sdhci_writel(host, val, ESDHC_TBCTL);

	esdhc_clock_enable(host, true);



	return sdhci_execute_tuning(mmc, opcode);

}



#ifdef CONFIG_PM_SLEEP

static u32 esdhc_proctl;

static int esdhc_of_suspend(struct device *dev)
@@ -790,6 +809,7 @@ static int sdhci_esdhc_probe(struct platform_device *pdev) 


	host->mmc_host_ops.start_signal_voltage_switch =

		esdhc_signal_voltage_switch;

	host->mmc_host_ops.execute_tuning = esdhc_execute_tuning;



	esdhc_init(pdev, host);