phy: add hix5hd2-sata-phy driver

Add hix5hd2-sata-phy driver on Hisilicon hix5hd2 soc.

Signed-off-by: Jiancheng Xue <xuejiancheng@huawei.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

3 files changed, 201 insertions, 0 deletions

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 64b98d242ea6..30c82fcbb492 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -109,6 +109,14 @@ config PHY_EXYNOS5250_SATA
           SATA 3.0 Gb/s, SATA 6.0 Gb/s speeds. It supports one SATA host
           port to accept one SATA device.
 
+config PHY_HIX5HD2_SATA
+        tristate "HIX5HD2 SATA PHY Driver"
+        depends on ARCH_HIX5HD2 && OF && HAS_IOMEM
+        select GENERIC_PHY
+        select MFD_SYSCON
+        help
+          Support for SATA PHY on Hisilicon hix5hd2 Soc.
+
 config PHY_SUN4I_USB
         tristate "Allwinner sunxi SoC USB PHY driver"
         depends on ARCH_SUNXI && HAS_IOMEM && OF
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index b4f1d5770601..54f04d04e85d 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
 obj-$(CONFIG_TI_PIPE3)                  += phy-ti-pipe3.o
 obj-$(CONFIG_TWL4030_USB)               += phy-twl4030-usb.o
 obj-$(CONFIG_PHY_EXYNOS5250_SATA)       += phy-exynos5250-sata.o
+obj-$(CONFIG_PHY_HIX5HD2_SATA)          += phy-hix5hd2-sata.o
 obj-$(CONFIG_PHY_SUN4I_USB)             += phy-sun4i-usb.o
 obj-$(CONFIG_PHY_SAMSUNG_USB2)          += phy-exynos-usb2.o
 phy-exynos-usb2-y                       += phy-samsung-usb2.o
diff --git a/drivers/phy/phy-hix5hd2-sata.c b/drivers/phy/phy-hix5hd2-sata.c
new file mode 100644
index 000000000000..d44283453d71
--- /dev/null
+++ b/drivers/phy/phy-hix5hd2-sata.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright (c) 2014 Linaro Ltd.
+ * Copyright (c) 2014 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define SATA_PHY0_CTLL          0xa0
+#define MPLL_MULTIPLIER_SHIFT   1
+#define MPLL_MULTIPLIER_MASK    0xfe
+#define MPLL_MULTIPLIER_50M     0x3c
+#define MPLL_MULTIPLIER_100M    0x1e
+#define PHY_RESET               BIT(0)
+#define REF_SSP_EN              BIT(9)
+#define SSC_EN                  BIT(10)
+#define REF_USE_PAD             BIT(23)
+
+#define SATA_PORT_PHYCTL        0x174
+#define SPEED_MODE_MASK         0x6f0000
+#define HALF_RATE_SHIFT         16
+#define PHY_CONFIG_SHIFT        18
+#define GEN2_EN_SHIFT           21
+#define SPEED_CTRL              BIT(20)
+
+#define SATA_PORT_PHYCTL1       0x148
+#define AMPLITUDE_MASK          0x3ffffe
+#define AMPLITUDE_GEN3          0x68
+#define AMPLITUDE_GEN3_SHIFT    15
+#define AMPLITUDE_GEN2          0x56
+#define AMPLITUDE_GEN2_SHIFT    8
+#define AMPLITUDE_GEN1          0x56
+#define AMPLITUDE_GEN1_SHIFT    1
+
+#define SATA_PORT_PHYCTL2       0x14c
+#define PREEMPH_MASK            0x3ffff
+#define PREEMPH_GEN3            0x20
+#define PREEMPH_GEN3_SHIFT      12
+#define PREEMPH_GEN2            0x15
+#define PREEMPH_GEN2_SHIFT      6
+#define PREEMPH_GEN1            0x5
+#define PREEMPH_GEN1_SHIFT      0
+
+struct hix5hd2_priv {
+        void __iomem    *base;
+        struct regmap   *peri_ctrl;
+};
+
+enum phy_speed_mode {
+        SPEED_MODE_GEN1 = 0,
+        SPEED_MODE_GEN2 = 1,
+        SPEED_MODE_GEN3 = 2,
+};
+
+static int hix5hd2_sata_phy_init(struct phy *phy)
+{
+        struct hix5hd2_priv *priv = phy_get_drvdata(phy);
+        u32 val, data[2];
+        int ret;
+
+        if (priv->peri_ctrl) {
+                ret = of_property_read_u32_array(phy->dev.of_node,
+                                                 "hisilicon,power-reg",
+                                                 &data[0], 2);
+                if (ret) {
+                        dev_err(&phy->dev, "Fail read hisilicon,power-reg\n");
+                        return ret;
+                }
+
+                regmap_update_bits(priv->peri_ctrl, data[0],
+                                   BIT(data[1]), BIT(data[1]));
+        }
+
+        /* reset phy */
+        val = readl_relaxed(priv->base + SATA_PHY0_CTLL);
+        val &= ~(MPLL_MULTIPLIER_MASK | REF_USE_PAD);
+        val |= MPLL_MULTIPLIER_50M << MPLL_MULTIPLIER_SHIFT |
+               REF_SSP_EN | PHY_RESET;
+        writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
+        msleep(20);
+        val &= ~PHY_RESET;
+        writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
+
+        val = readl_relaxed(priv->base + SATA_PORT_PHYCTL1);
+        val &= ~AMPLITUDE_MASK;
+        val |= AMPLITUDE_GEN3 << AMPLITUDE_GEN3_SHIFT |
+               AMPLITUDE_GEN2 << AMPLITUDE_GEN2_SHIFT |
+               AMPLITUDE_GEN1 << AMPLITUDE_GEN1_SHIFT;
+        writel_relaxed(val, priv->base + SATA_PORT_PHYCTL1);
+
+        val = readl_relaxed(priv->base + SATA_PORT_PHYCTL2);
+        val &= ~PREEMPH_MASK;
+        val |= PREEMPH_GEN3 << PREEMPH_GEN3_SHIFT |
+               PREEMPH_GEN2 << PREEMPH_GEN2_SHIFT |
+               PREEMPH_GEN1 << PREEMPH_GEN1_SHIFT;
+        writel_relaxed(val, priv->base + SATA_PORT_PHYCTL2);
+
+        /* ensure PHYCTRL setting takes effect */
+        val = readl_relaxed(priv->base + SATA_PORT_PHYCTL);
+        val &= ~SPEED_MODE_MASK;
+        val |= SPEED_MODE_GEN1 << HALF_RATE_SHIFT |
+               SPEED_MODE_GEN1 << PHY_CONFIG_SHIFT |
+               SPEED_MODE_GEN1 << GEN2_EN_SHIFT | SPEED_CTRL;
+        writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
+
+        msleep(20);
+        val &= ~SPEED_MODE_MASK;
+        val |= SPEED_MODE_GEN3 << HALF_RATE_SHIFT |
+               SPEED_MODE_GEN3 << PHY_CONFIG_SHIFT |
+               SPEED_MODE_GEN3 << GEN2_EN_SHIFT | SPEED_CTRL;
+        writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
+
+        val &= ~(SPEED_MODE_MASK | SPEED_CTRL);
+        val |= SPEED_MODE_GEN2 << HALF_RATE_SHIFT |
+               SPEED_MODE_GEN2 << PHY_CONFIG_SHIFT |
+               SPEED_MODE_GEN2 << GEN2_EN_SHIFT;
+        writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
+
+        return 0;
+}
+
+static struct phy_ops hix5hd2_sata_phy_ops = {
+        .init           = hix5hd2_sata_phy_init,
+        .owner          = THIS_MODULE,
+};
+
+static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
+{
+        struct phy_provider *phy_provider;
+        struct device *dev = &pdev->dev;
+        struct resource *res;
+        struct phy *phy;
+        struct hix5hd2_priv *priv;
+
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        priv->base = devm_ioremap(dev, res->start, resource_size(res));
+        if (!priv->base)
+                return -ENOMEM;
+
+        priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
+                                        "hisilicon,peripheral-syscon");
+        if (IS_ERR(priv->peri_ctrl))
+                priv->peri_ctrl = NULL;
+
+        phy = devm_phy_create(dev, &hix5hd2_sata_phy_ops, NULL);
+        if (IS_ERR(phy)) {
+                dev_err(dev, "failed to create PHY\n");
+                return PTR_ERR(phy);
+        }
+
+        phy_set_drvdata(phy, priv);
+        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+        if (IS_ERR(phy_provider))
+                return PTR_ERR(phy_provider);
+
+        return 0;
+}
+
+static const struct of_device_id hix5hd2_sata_phy_of_match[] = {
+        {.compatible = "hisilicon,hix5hd2-sata-phy",},
+        { },
+};
+MODULE_DEVICE_TABLE(of, hix5hd2_sata_phy_of_match);
+
+static struct platform_driver hix5hd2_sata_phy_driver = {
+        .probe  = hix5hd2_sata_phy_probe,
+        .driver = {
+                .name   = "hix5hd2-sata-phy",
+                .owner  = THIS_MODULE,
+                .of_match_table = hix5hd2_sata_phy_of_match,
+        }
+};
+module_platform_driver(hix5hd2_sata_phy_driver);
+
+MODULE_AUTHOR("Jiancheng Xue <xuejiancheng@huawei.com>");
+MODULE_DESCRIPTION("HISILICON HIX5HD2 SATA PHY driver");
+MODULE_ALIAS("platform:hix5hd2-sata-phy");
+MODULE_LICENSE("GPL v2");