[PATCH 2/2] [2/2] mmc: sdhci-cadence: Update PHY delay configuration
From: Piotr Sroka
Date: Thu Feb 16 2017 - 08:42:28 EST
DTS properties are used instead of fixed data
because PHY settings can be different for different platforms.
Configuration of new three PHY delays were added
Signed-off-by: Piotr Sroka <piotrs@xxxxxxxxxxx>
---
.../devicetree/bindings/mmc/sdhci-cadence.txt | 54 ++++++++++++++
drivers/mmc/host/sdhci-cadence.c | 83 +++++++++++++++++++---
2 files changed, 129 insertions(+), 8 deletions(-)
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
index c0f37cb..221d3fe 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-cadence.txt
@@ -19,6 +19,59 @@ if supported. See mmc.txt for details.
- mmc-hs400-1_8v
- mmc-hs400-1_2v
+- phy-input-delay-sd-hs:
+ Value of the delay in the input path for High Speed work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-sd-default:
+ Value of the delay in the input path for Default Speed work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-sd-sdr12:
+ Value of the delay in the input path for SDR12 work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-sd-sdr25:
+ Value of the delay in the input path for SDR25 work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-sd-sdr50:
+ Value of the delay in the input path for SDR50 work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-sd-ddr50:
+ Value of the delay in the input path for DDR50 work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-emmc-legacy:
+ Value of the delay in the input path for eMMC legacy work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-emmc-sdr:
+ Value of the delay in the input path for eMMC SDR work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-input-delay-emmc-ddr:
+ Value of the delay in the input path for eMMC DDR work mode.
+ Valid range = [0:0x1F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-dll-delay-sdclk:
+ Value of the delay introduced on the sdclk output
+ for all modes except HS200, HS400 and HS400_ES.
+ Valid range = [0:0x7F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-dll-delay-sdclk-hsmmc:
+ Value of the delay introduced on the sdclk output
+ for HS200, HS400 and HS400_ES speed modes.
+ Valid range = [0:0x7F].
+ Delay configuration stay unchanged if this property is not provided.
+- phy-dll-delay-strobe:
+ Value of the delay introduced on the dat_strobe input
+ used in HS400 / HS400_ES speed modes.
+ Valid range = [0:0x7F].
+ Delay configuration stay unchanged if this property is not provided.
+
+
Example:
emmc: sdhci@5a000000 {
compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
@@ -29,4 +82,5 @@ Example:
mmc-ddr-1_8v;
mmc-hs200-1_8v;
mmc-hs400-1_8v;
+ phy-input-delay-sd-hs = <0>;
};
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index c946e45..6c338d2 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -17,6 +17,7 @@
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/mmc/host.h>
+#include <linux/of.h>
#include "sdhci-pltfm.h"
@@ -53,6 +54,9 @@
#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
@@ -89,13 +93,73 @@ 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_parse_dt(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 tmp;
+ int ret;
+
+ if (!of_property_read_u32(np, "phy-input-delay-sd-hs", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_SD_HS, tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-input-delay-sd-default", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_SD_DEFAULT,
+ tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-input-delay-sd-sdr12", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_UHS_SDR12,
+ tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-input-delay-sd-sdr25", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_UHS_SDR25,
+ tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-input-delay-sd-sdr50", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_UHS_SDR50,
+ tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-input-delay-sd-ddr50", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_UHS_DDR50,
+ tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-dll-delay-sdclk", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_SDCLK, tmp);
+
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-dll-delay-sdclk-hsmmc", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_HSMMC, tmp);
+ if (ret)
+ return ret;
+ }
+ if (!of_property_read_u32(np, "phy-dll-delay-strobe", &tmp)) {
+ ret = sdhci_cdns_write_phy_reg(priv,
+ SDHCI_CDNS_PHY_DLY_STROBE, tmp);
+ if (ret)
+ return ret;
+ }
+ return 0;
}
static inline void *sdhci_cdns_priv(struct sdhci_host *host)
@@ -224,10 +288,11 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_cdns_priv *priv;
+ struct device *dev = &pdev->dev;
struct clk *clk;
int ret;
- clk = devm_clk_get(&pdev->dev, NULL);
+ clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
@@ -253,7 +318,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
if (ret)
goto free;
- sdhci_cdns_phy_init(priv);
+ ret = sdhci_cdns_phy_parse_dt(dev->of_node, priv);
+ if (ret)
+ goto free;
ret = sdhci_add_host(host);
if (ret)
--
2.2.2