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>
---
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
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
