On 27/03/17 10:49, Yangbo Lu wrote:
> eSDHC uses tuning block for tuning procedure. So the tuning
> block control register must be configured properly before tuning.
>
> Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> Changes for v2:
> - Replaced old function for mmc_host_ops.execute_tuning with
> esdhc_execute_tuning to support eSDHC tuning.
> Changes for v3:
> - Put .execute_tuning assigning after after IS_ERR(host) check.
> ---
> drivers/mmc/host/sdhci-esdhc.h | 5 +++++
> drivers/mmc/host/sdhci-of-esdhc.c | 20 ++++++++++++++++++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
> index 6869567..c4bbd74 100644
> --- a/drivers/mmc/host/sdhci-esdhc.h
> +++ b/drivers/mmc/host/sdhci-esdhc.h
> @@ -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 */
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index a70499a..8c8e147 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -630,6 +630,25 @@ 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)
> @@ -787,6 +806,7 @@ 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);
>
>
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