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mmc: sdhci-cadence: Update PHY delay configuration

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DTS properties are used instead of fixed data
because PHY settings can be different for different chips/boards.

Signed-off-by: Piotr Sroka <piotrs@cadence.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Piotr Sroka 2017-03-21 14:33:11 +00:00 committed by Ulf Hansson
parent 6f4b091902
commit a89c472d8b
1 changed files with 46 additions and 7 deletions
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53
drivers/mmc/host/sdhci-cadence.c
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@ -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"
@ -55,6 +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
@ -68,6 +72,25 @@ struct sdhci_cdns_priv {
bool enhanced_strobe;
};
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)
{
@ -92,13 +115,26 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
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)
@ -267,6 +303,7 @@ 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);
if (IS_ERR(clk))
@ -297,7 +334,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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)