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path: root/drivers/mmc/host/sdhci-cadence.c
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Diffstat (limited to 'drivers/mmc/host/sdhci-cadence.c')
-rw-r--r--drivers/mmc/host/sdhci-cadence.c129
1 files changed, 110 insertions, 19 deletions
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 316cfec3f005..19d5698244b5 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
+#include <linux/of.h>
#include "sdhci-pltfm.h"
@@ -40,6 +41,7 @@
#define SDHCI_CDNS_HRS06_MODE_MMC_DDR 0x3
#define SDHCI_CDNS_HRS06_MODE_MMC_HS200 0x4
#define SDHCI_CDNS_HRS06_MODE_MMC_HS400 0x5
+#define SDHCI_CDNS_HRS06_MODE_MMC_HS400ES 0x6
/* SRS - Slot Register Set (SDHCI-compatible) */
#define SDHCI_CDNS_SRS_BASE 0x200
@@ -54,6 +56,9 @@
#define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY 0x06
#define SDHCI_CDNS_PHY_DLY_EMMC_SDR 0x07
#define SDHCI_CDNS_PHY_DLY_EMMC_DDR 0x08
+#define SDHCI_CDNS_PHY_DLY_SDCLK 0x0b
+#define SDHCI_CDNS_PHY_DLY_HSMMC 0x0c
+#define SDHCI_CDNS_PHY_DLY_STROBE 0x0d
/*
* The tuned val register is 6 bit-wide, but not the whole of the range is
@@ -64,13 +69,34 @@
struct sdhci_cdns_priv {
void __iomem *hrs_addr;
+ bool enhanced_strobe;
};
-static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
- u8 addr, u8 data)
+struct sdhci_cdns_phy_cfg {
+ const char *property;
+ u8 addr;
+};
+
+static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
+ { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, },
+ { "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, },
+ { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, },
+ { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, },
+ { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, },
+ { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, },
+ { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, },
+ { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, },
+ { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, },
+ { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, },
+ { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
+};
+
+static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
+ u8 addr, u8 data)
{
void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS04;
u32 tmp;
+ int ret;
tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) |
(addr << SDHCI_CDNS_HRS04_ADDR_SHIFT);
@@ -79,17 +105,36 @@ static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
tmp |= SDHCI_CDNS_HRS04_WR;
writel(tmp, reg);
+ ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10);
+ if (ret)
+ return ret;
+
tmp &= ~SDHCI_CDNS_HRS04_WR;
writel(tmp, reg);
+
+ return 0;
}
-static void sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
+static int sdhci_cdns_phy_init(struct device_node *np,
+ struct sdhci_cdns_priv *priv)
{
- sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_SD_HS, 4);
- sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_SD_DEFAULT, 4);
- sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_LEGACY, 9);
- sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_SDR, 2);
- sdhci_cdns_write_phy_reg(priv, SDHCI_CDNS_PHY_DLY_EMMC_DDR, 3);
+ u32 val;
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) {
+ ret = of_property_read_u32(np, sdhci_cdns_phy_cfgs[i].property,
+ &val);
+ if (ret)
+ continue;
+
+ ret = sdhci_cdns_write_phy_reg(priv,
+ sdhci_cdns_phy_cfgs[i].addr,
+ val);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}
static inline void *sdhci_cdns_priv(struct sdhci_host *host)
@@ -103,16 +148,35 @@ static unsigned int sdhci_cdns_get_timeout_clock(struct sdhci_host *host)
{
/*
* Cadence's spec says the Timeout Clock Frequency is the same as the
- * Base Clock Frequency. Divide it by 1000 to return a value in kHz.
+ * Base Clock Frequency.
*/
- return host->max_clk / 1000;
+ return host->max_clk;
+}
+
+static void sdhci_cdns_set_emmc_mode(struct sdhci_cdns_priv *priv, u32 mode)
+{
+ u32 tmp;
+
+ /* The speed mode for eMMC is selected by HRS06 register */
+ tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
+ tmp &= ~SDHCI_CDNS_HRS06_MODE_MASK;
+ tmp |= mode;
+ writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
+}
+
+static u32 sdhci_cdns_get_emmc_mode(struct sdhci_cdns_priv *priv)
+{
+ u32 tmp;
+
+ tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
+ return tmp & SDHCI_CDNS_HRS06_MODE_MASK;
}
static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
unsigned int timing)
{
struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host);
- u32 mode, tmp;
+ u32 mode;
switch (timing) {
case MMC_TIMING_MMC_HS:
@@ -125,18 +189,17 @@ static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
mode = SDHCI_CDNS_HRS06_MODE_MMC_HS200;
break;
case MMC_TIMING_MMC_HS400:
- mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400;
+ if (priv->enhanced_strobe)
+ mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400ES;
+ else
+ mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400;
break;
default:
mode = SDHCI_CDNS_HRS06_MODE_SD;
break;
}
- /* The speed mode for eMMC is selected by HRS06 register */
- tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
- tmp &= ~SDHCI_CDNS_HRS06_MODE_MASK;
- tmp |= mode;
- writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
+ sdhci_cdns_set_emmc_mode(priv, mode);
/* For SD, fall back to the default handler */
if (mode == SDHCI_CDNS_HRS06_MODE_SD)
@@ -213,6 +276,26 @@ static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode)
return sdhci_cdns_set_tune_val(host, end_of_streak - max_streak / 2);
}
+static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host);
+ u32 mode;
+
+ priv->enhanced_strobe = ios->enhanced_strobe;
+
+ mode = sdhci_cdns_get_emmc_mode(priv);
+
+ if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400 && ios->enhanced_strobe)
+ sdhci_cdns_set_emmc_mode(priv,
+ SDHCI_CDNS_HRS06_MODE_MMC_HS400ES);
+
+ if (mode == SDHCI_CDNS_HRS06_MODE_MMC_HS400ES && !ios->enhanced_strobe)
+ sdhci_cdns_set_emmc_mode(priv,
+ SDHCI_CDNS_HRS06_MODE_MMC_HS400);
+}
+
static int sdhci_cdns_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
@@ -220,8 +303,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
struct sdhci_cdns_priv *priv;
struct clk *clk;
int ret;
+ struct device *dev = &pdev->dev;
- clk = devm_clk_get(&pdev->dev, NULL);
+ clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
@@ -240,14 +324,21 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
priv = sdhci_cdns_priv(host);
priv->hrs_addr = host->ioaddr;
+ priv->enhanced_strobe = false;
host->ioaddr += SDHCI_CDNS_SRS_BASE;
host->mmc_host_ops.execute_tuning = sdhci_cdns_execute_tuning;
+ host->mmc_host_ops.hs400_enhanced_strobe =
+ sdhci_cdns_hs400_enhanced_strobe;
+
+ sdhci_get_of_property(pdev);
ret = mmc_of_parse(host->mmc);
if (ret)
goto free;
- sdhci_cdns_phy_init(priv);
+ ret = sdhci_cdns_phy_init(dev->of_node, priv);
+ if (ret)
+ goto free;
ret = sdhci_add_host(host);
if (ret)
generated by cgit (git 2.34.1) at 2024-06-18 01:51:05 +0000