AuxXxilium/linux_dsm_epyc7002
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mmc: sdhci-of-esdhc: add tuning support

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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@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
yangbo lu 2017-04-20 16:14:42 +08:00 committed by Ulf Hansson
parent ea35645a3c
commit ba49cbd093
2 changed files with 25 additions and 0 deletions
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5
drivers/mmc/host/sdhci-esdhc.h
View File

@ -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 */

20
drivers/mmc/host/sdhci-of-esdhc.c
View File

@ -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);