1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/phy/phy-exynos-pcie.c b/drivers/phy/phy-exynos-pcie.c
new file mode 100644
index 000000000000..4f60b83641d5
--- /dev/null
+++ b/drivers/phy/phy-exynos-pcie.c
@@ -0,0 +1,285 @@
+/*
+ * Samsung EXYNOS SoC series PCIe PHY driver
+ *
+ * Phy provider for PCIe controller on Exynos SoC series
+ *
+ * Copyright (C) 2017 Samsung Electronics Co., Ltd.
+ * Jaehoon Chung <jh80.chung@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+
+/* PCIe Purple registers */
+#define PCIE_PHY_GLOBAL_RESET           0x000
+#define PCIE_PHY_COMMON_RESET           0x004
+#define PCIE_PHY_CMN_REG                0x008
+#define PCIE_PHY_MAC_RESET              0x00c
+#define PCIE_PHY_PLL_LOCKED             0x010
+#define PCIE_PHY_TRSVREG_RESET          0x020
+#define PCIE_PHY_TRSV_RESET             0x024
+
+/* PCIe PHY registers */
+#define PCIE_PHY_IMPEDANCE              0x004
+#define PCIE_PHY_PLL_DIV_0              0x008
+#define PCIE_PHY_PLL_BIAS               0x00c
+#define PCIE_PHY_DCC_FEEDBACK           0x014
+#define PCIE_PHY_PLL_DIV_1              0x05c
+#define PCIE_PHY_COMMON_POWER           0x064
+#define PCIE_PHY_COMMON_PD_CMN          BIT(3)
+#define PCIE_PHY_TRSV0_EMP_LVL          0x084
+#define PCIE_PHY_TRSV0_DRV_LVL          0x088
+#define PCIE_PHY_TRSV0_RXCDR            0x0ac
+#define PCIE_PHY_TRSV0_POWER            0x0c4
+#define PCIE_PHY_TRSV0_PD_TSV           BIT(7)
+#define PCIE_PHY_TRSV0_LVCC             0x0dc
+#define PCIE_PHY_TRSV1_EMP_LVL          0x144
+#define PCIE_PHY_TRSV1_RXCDR            0x16c
+#define PCIE_PHY_TRSV1_POWER            0x184
+#define PCIE_PHY_TRSV1_PD_TSV           BIT(7)
+#define PCIE_PHY_TRSV1_LVCC             0x19c
+#define PCIE_PHY_TRSV2_EMP_LVL          0x204
+#define PCIE_PHY_TRSV2_RXCDR            0x22c
+#define PCIE_PHY_TRSV2_POWER            0x244
+#define PCIE_PHY_TRSV2_PD_TSV           BIT(7)
+#define PCIE_PHY_TRSV2_LVCC             0x25c
+#define PCIE_PHY_TRSV3_EMP_LVL          0x2c4
+#define PCIE_PHY_TRSV3_RXCDR            0x2ec
+#define PCIE_PHY_TRSV3_POWER            0x304
+#define PCIE_PHY_TRSV3_PD_TSV           BIT(7)
+#define PCIE_PHY_TRSV3_LVCC             0x31c
+
+struct exynos_pcie_phy_data {
+        const struct phy_ops    *ops;
+};
+
+/* For Exynos pcie phy */
+struct exynos_pcie_phy {
+        const struct exynos_pcie_phy_data *drv_data;
+        void __iomem *phy_base;
+        void __iomem *blk_base; /* For exynos5440 */
+};
+
+static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset)
+{
+        writel(val, base + offset);
+}
+
+static u32 exynos_pcie_phy_readl(void __iomem *base, u32 offset)
+{
+        return readl(base + offset);
+}
+
+/* For Exynos5440 specific functions */
+static int exynos5440_pcie_phy_init(struct phy *phy)
+{
+        struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
+
+        /* DCC feedback control off */
+        exynos_pcie_phy_writel(ep->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK);
+
+        /* set TX/RX impedance */
+        exynos_pcie_phy_writel(ep->phy_base, 0xd5, PCIE_PHY_IMPEDANCE);
+
+        /* set 50Mhz PHY clock */
+        exynos_pcie_phy_writel(ep->phy_base, 0x14, PCIE_PHY_PLL_DIV_0);
+        exynos_pcie_phy_writel(ep->phy_base, 0x12, PCIE_PHY_PLL_DIV_1);
+
+        /* set TX Differential output for lane 0 */
+        exynos_pcie_phy_writel(ep->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL);
+
+        /* set TX Pre-emphasis Level Control for lane 0 to minimum */
+        exynos_pcie_phy_writel(ep->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL);
+
+        /* set RX clock and data recovery bandwidth */
+        exynos_pcie_phy_writel(ep->phy_base, 0xe7, PCIE_PHY_PLL_BIAS);
+        exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR);
+        exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR);
+        exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR);
+        exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR);
+
+        /* change TX Pre-emphasis Level Control for lanes */
+        exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL);
+        exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL);
+        exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL);
+        exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL);
+
+        /* set LVCC */
+        exynos_pcie_phy_writel(ep->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC);
+        exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC);
+        exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC);
+        exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC);
+
+        /* pulse for common reset */
+        exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_COMMON_RESET);
+        udelay(500);
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET);
+
+        return 0;
+}
+
+static int exynos5440_pcie_phy_power_on(struct phy *phy)
+{
+        struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
+        u32 val;
+
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET);
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_CMN_REG);
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSVREG_RESET);
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSV_RESET);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
+        val &= ~PCIE_PHY_COMMON_PD_CMN;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
+        val &= ~PCIE_PHY_TRSV0_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
+        val &= ~PCIE_PHY_TRSV1_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
+        val &= ~PCIE_PHY_TRSV2_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
+        val &= ~PCIE_PHY_TRSV3_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
+
+        return 0;
+}
+
+static int exynos5440_pcie_phy_power_off(struct phy *phy)
+{
+        struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
+        u32 val;
+
+        if (readl_poll_timeout(ep->phy_base + PCIE_PHY_PLL_LOCKED, val,
+                                (val != 0), 1, 500)) {
+                dev_err(&phy->dev, "PLL Locked: 0x%x\n", val);
+                return -ETIMEDOUT;
+        }
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER);
+        val |= PCIE_PHY_COMMON_PD_CMN;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER);
+        val |= PCIE_PHY_TRSV0_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER);
+        val |= PCIE_PHY_TRSV1_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER);
+        val |= PCIE_PHY_TRSV2_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER);
+
+        val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER);
+        val |= PCIE_PHY_TRSV3_PD_TSV;
+        exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER);
+
+        return 0;
+}
+
+static int exynos5440_pcie_phy_reset(struct phy *phy)
+{
+        struct exynos_pcie_phy *ep = phy_get_drvdata(phy);
+
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_MAC_RESET);
+        exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_GLOBAL_RESET);
+        exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_GLOBAL_RESET);
+
+        return 0;
+}
+
+static const struct phy_ops exynos5440_phy_ops = {
+        .init           = exynos5440_pcie_phy_init,
+        .power_on       = exynos5440_pcie_phy_power_on,
+        .power_off      = exynos5440_pcie_phy_power_off,
+        .reset          = exynos5440_pcie_phy_reset,
+        .owner          = THIS_MODULE,
+};
+
+static const struct exynos_pcie_phy_data exynos5440_pcie_phy_data = {
+        .ops            = &exynos5440_phy_ops,
+};
+
+static const struct of_device_id exynos_pcie_phy_match[] = {
+        {
+                .compatible = "samsung,exynos5440-pcie-phy",
+                .data = &exynos5440_pcie_phy_data,
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, exynos_pcie_phy_match);
+
+static int exynos_pcie_phy_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct exynos_pcie_phy *exynos_phy;
+        struct phy *generic_phy;
+        struct phy_provider *phy_provider;
+        struct resource *res;
+        const struct exynos_pcie_phy_data *drv_data;
+
+        drv_data = of_device_get_match_data(dev);
+        if (!drv_data)
+                return -ENODEV;
+
+        exynos_phy = devm_kzalloc(dev, sizeof(*exynos_phy), GFP_KERNEL);
+        if (!exynos_phy)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        exynos_phy->phy_base = devm_ioremap_resource(dev, res);
+        if (IS_ERR(exynos_phy->phy_base))
+                return PTR_ERR(exynos_phy->phy_base);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        exynos_phy->blk_base = devm_ioremap_resource(dev, res);
+        if (IS_ERR(exynos_phy->phy_base))
+                return PTR_ERR(exynos_phy->phy_base);
+
+        exynos_phy->drv_data = drv_data;
+
+        generic_phy = devm_phy_create(dev, dev->of_node, drv_data->ops);
+        if (IS_ERR(generic_phy)) {
+                dev_err(dev, "failed to create PHY\n");
+                return PTR_ERR(generic_phy);
+        }
+
+        phy_set_drvdata(generic_phy, exynos_phy);
+        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+        return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver exynos_pcie_phy_driver = {
+        .probe  = exynos_pcie_phy_probe,
+        .driver = {
+                .of_match_table = exynos_pcie_phy_match,
+                .name           = "exynos_pcie_phy",
+        }
+};
+module_platform_driver(exynos_pcie_phy_driver);
+
+MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC PCIe PHY driver");
+MODULE_AUTHOR("Jaehoon Chung <jh80.chung@samsung.com>");
+MODULE_LICENSE("GPL v2");