[v2, 3/7] mmc: sdhci-of-esdhc: add tuning support
From: Yangbo Lu <hidden>
Date: 2017-03-03 08:18:45
Also in:
linux-arm-kernel, linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
eSDHC uses tuning block for tuning procedure. So the tuning block control register must be configured properly before tuning. Signed-off-by: Yangbo Lu <redacted> --- Changes for v3: - Replaced old function for mmc_host_ops.execute_tuning with esdhc_execute_tuning to support eSDHC tuning. --- drivers/mmc/host/sdhci-esdhc.h | 5 +++++ drivers/mmc/host/sdhci-of-esdhc.c | 21 +++++++++++++++++++++ 2 files changed, 26 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 9ab6943..8007188 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)
@@ -782,6 +801,8 @@ 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; + if (IS_ERR(host)) return PTR_ERR(host);
--
2.1.0.27.g96db324
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