summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorHu Ziji <huziji@marvell.com>2017-08-23 21:15:02 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2017-08-30 16:03:43 +0300
commitaab6e25a5ae1e738361ea0d94bcd5c8385664cf1 (patch)
tree0a157aea5cd8f6ed6dc55ae359b5391b13d3eb31 /drivers/mmc
parent1284c248d145926760eab7244252f695f7a7a46a (diff)
downloadlinux-aab6e25a5ae1e738361ea0d94bcd5c8385664cf1.tar.xz
mmc: sdhci-xenon: Support HS400 Enhanced Strobe feature
Support HS400 Enhanced Strobe feature in Xenon. Enable Enhanced Strobe together with Data Strobe. Disable Enhanced Strobe when eMMC is not in HS400 mode. Signed-off-by: Hu Ziji <huziji@marvell.com> Signed-off-by: Zhoujie Wu <zjwu@marvell.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-xenon-phy.c34
-rw-r--r--drivers/mmc/host/sdhci-xenon.h1
2 files changed, 29 insertions, 6 deletions
diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index f7e26b031e76..ec8794335241 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -409,17 +409,30 @@ static int xenon_emmc_phy_config_tuning(struct sdhci_host *host)
return 0;
}
-static void xenon_emmc_phy_disable_data_strobe(struct sdhci_host *host)
+static void xenon_emmc_phy_disable_strobe(struct sdhci_host *host)
{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 reg;
- /* Disable SDHC Data Strobe */
+ /* Disable both SDHC Data Strobe and Enhanced Strobe */
reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
- reg &= ~XENON_ENABLE_DATA_STROBE;
+ reg &= ~(XENON_ENABLE_DATA_STROBE | XENON_ENABLE_RESP_STROBE);
sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);
+
+ /* Clear Strobe line Pull down or Pull up */
+ if (priv->phy_type == EMMC_5_0_PHY) {
+ reg = sdhci_readl(host, XENON_EMMC_5_0_PHY_PAD_CONTROL);
+ reg &= ~(XENON_EMMC5_FC_QSP_PD | XENON_EMMC5_FC_QSP_PU);
+ sdhci_writel(host, reg, XENON_EMMC_5_0_PHY_PAD_CONTROL);
+ } else {
+ reg = sdhci_readl(host, XENON_EMMC_PHY_PAD_CONTROL1);
+ reg &= ~(XENON_EMMC5_1_FC_QSP_PD | XENON_EMMC5_1_FC_QSP_PU);
+ sdhci_writel(host, reg, XENON_EMMC_PHY_PAD_CONTROL1);
+ }
}
-/* Set HS400 Data Strobe */
+/* Set HS400 Data Strobe and Enhanced Strobe */
static void xenon_emmc_phy_strobe_delay_adj(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -439,6 +452,15 @@ static void xenon_emmc_phy_strobe_delay_adj(struct sdhci_host *host)
/* Enable SDHC Data Strobe */
reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
reg |= XENON_ENABLE_DATA_STROBE;
+ /*
+ * Enable SDHC Enhanced Strobe if supported
+ * Xenon Enhanced Strobe should be enabled only when
+ * 1. card is in HS400 mode and
+ * 2. SDCLK is higher than 52MHz
+ * 3. DLL is enabled
+ */
+ if (host->mmc->ios.enhanced_strobe)
+ reg |= XENON_ENABLE_RESP_STROBE;
sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);
/* Set Data Strobe Pull down */
@@ -615,7 +637,7 @@ static void xenon_emmc_phy_set(struct sdhci_host *host,
sdhci_writel(host, phy_regs->logic_timing_val,
phy_regs->logic_timing_adj);
else
- xenon_emmc_phy_disable_data_strobe(host);
+ xenon_emmc_phy_disable_strobe(host);
phy_init:
xenon_emmc_phy_init(host);
@@ -705,7 +727,7 @@ void xenon_soc_pad_ctrl(struct sdhci_host *host,
/*
* Setting PHY when card is working in High Speed Mode.
- * HS400 set data strobe line.
+ * HS400 set Data Strobe and Enhanced Strobe if it is supported.
* HS200/SDR104 set tuning config to prepare for tuning.
*/
static int xenon_hs_delay_adj(struct sdhci_host *host)
diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 73debb42dc2f..01937f1681b1 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -33,6 +33,7 @@
#define XENON_TUNING_STEP_DIVIDER BIT(6)
#define XENON_SLOT_EMMC_CTRL 0x0130
+#define XENON_ENABLE_RESP_STROBE BIT(25)
#define XENON_ENABLE_DATA_STROBE BIT(24)
#define XENON_SLOT_RETUNING_REQ_CTRL 0x0144