mmc: sdhci-cadence: add HS400 enhanced strobe support
Add support for HS400ES mode to Cadence SDHCI driver. Signed-off-by: Piotr Sroka <piotrs@cadence.com> Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -40,6 +40,7 @@
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#define SDHCI_CDNS_HRS06_MODE_MMC_DDR 0x3
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#define SDHCI_CDNS_HRS06_MODE_MMC_DDR 0x3
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#define SDHCI_CDNS_HRS06_MODE_MMC_HS200 0x4
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#define SDHCI_CDNS_HRS06_MODE_MMC_HS200 0x4
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#define SDHCI_CDNS_HRS06_MODE_MMC_HS400 0x5
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#define SDHCI_CDNS_HRS06_MODE_MMC_HS400 0x5
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#define SDHCI_CDNS_HRS06_MODE_MMC_HS400ES 0x6
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/* SRS - Slot Register Set (SDHCI-compatible) */
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/* SRS - Slot Register Set (SDHCI-compatible) */
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#define SDHCI_CDNS_SRS_BASE 0x200
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#define SDHCI_CDNS_SRS_BASE 0x200
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@ -64,6 +65,7 @@
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struct sdhci_cdns_priv {
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struct sdhci_cdns_priv {
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void __iomem *hrs_addr;
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void __iomem *hrs_addr;
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bool enhanced_strobe;
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};
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};
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static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
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static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
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@ -108,11 +110,30 @@ static unsigned int sdhci_cdns_get_timeout_clock(struct sdhci_host *host)
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return host->max_clk / 1000;
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return host->max_clk / 1000;
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}
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}
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static void sdhci_cdns_set_emmc_mode(struct sdhci_cdns_priv *priv, u32 mode)
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{
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u32 tmp;
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/* The speed mode for eMMC is selected by HRS06 register */
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tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
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tmp &= ~SDHCI_CDNS_HRS06_MODE_MASK;
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tmp |= mode;
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writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
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}
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static u32 sdhci_cdns_get_emmc_mode(struct sdhci_cdns_priv *priv)
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{
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u32 tmp;
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tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
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return tmp & SDHCI_CDNS_HRS06_MODE_MASK;
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}
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static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
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static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
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unsigned int timing)
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unsigned int timing)
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{
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{
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struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host);
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struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host);
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u32 mode, tmp;
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u32 mode;
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switch (timing) {
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switch (timing) {
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case MMC_TIMING_MMC_HS:
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case MMC_TIMING_MMC_HS:
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@ -125,18 +146,17 @@ static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
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mode = SDHCI_CDNS_HRS06_MODE_MMC_HS200;
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mode = SDHCI_CDNS_HRS06_MODE_MMC_HS200;
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break;
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break;
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case MMC_TIMING_MMC_HS400:
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case MMC_TIMING_MMC_HS400:
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mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400;
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if (priv->enhanced_strobe)
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mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400ES;
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else
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mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400;
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break;
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break;
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default:
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default:
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mode = SDHCI_CDNS_HRS06_MODE_SD;
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mode = SDHCI_CDNS_HRS06_MODE_SD;
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break;
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break;
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}
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}
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/* The speed mode for eMMC is selected by HRS06 register */
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sdhci_cdns_set_emmc_mode(priv, mode);
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tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
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tmp &= ~SDHCI_CDNS_HRS06_MODE_MASK;
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tmp |= mode;
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writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
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/* For SD, fall back to the default handler */
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/* For SD, fall back to the default handler */
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if (mode == SDHCI_CDNS_HRS06_MODE_SD)
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if (mode == SDHCI_CDNS_HRS06_MODE_SD)
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@ -213,6 +233,26 @@ static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode)
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return sdhci_cdns_set_tune_val(host, end_of_streak - max_streak / 2);
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return sdhci_cdns_set_tune_val(host, end_of_streak - max_streak / 2);
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}
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}
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static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc,
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struct mmc_ios *ios)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host);
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u32 mode;
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priv->enhanced_strobe = ios->enhanced_strobe;
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mode = sdhci_cdns_get_emmc_mode(priv);
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if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400 && ios->enhanced_strobe)
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sdhci_cdns_set_emmc_mode(priv,
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SDHCI_CDNS_HRS06_MODE_MMC_HS400ES);
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if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400ES && !ios->enhanced_strobe)
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sdhci_cdns_set_emmc_mode(priv,
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SDHCI_CDNS_HRS06_MODE_MMC_HS400);
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}
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static int sdhci_cdns_probe(struct platform_device *pdev)
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static int sdhci_cdns_probe(struct platform_device *pdev)
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{
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{
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struct sdhci_host *host;
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struct sdhci_host *host;
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@ -240,8 +280,11 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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priv = sdhci_cdns_priv(host);
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priv = sdhci_cdns_priv(host);
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priv->hrs_addr = host->ioaddr;
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priv->hrs_addr = host->ioaddr;
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priv->enhanced_strobe = false;
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host->ioaddr += SDHCI_CDNS_SRS_BASE;
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host->ioaddr += SDHCI_CDNS_SRS_BASE;
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host->mmc_host_ops.execute_tuning = sdhci_cdns_execute_tuning;
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host->mmc_host_ops.execute_tuning = sdhci_cdns_execute_tuning;
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host->mmc_host_ops.hs400_enhanced_strobe =
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sdhci_cdns_hs400_enhanced_strobe;
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ret = mmc_of_parse(host->mmc);
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ret = mmc_of_parse(host->mmc);
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if (ret)
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if (ret)
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