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mmc: sdhci-xenon: Support HS400 Enhanced Strobe feature

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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>
This commit is contained in:
Hu Ziji 2017-08-23 11:15:02 -07:00 committed by Ulf Hansson
parent 1284c248d1
commit aab6e25a5a
2 changed files with 29 additions and 6 deletions
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34
drivers/mmc/host/sdhci-xenon-phy.c
View File

@ -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)

1
drivers/mmc/host/sdhci-xenon.h
View File

@ -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