--- /dev/null
+/*
+ * Samsung SATA SerDes(PHY) driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Authors: Girish K S <ks.giri@samsung.com>
+ * Yuvaraj Kumar C D <yuvaraj.cd@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/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
+
+#define SATAPHY_CONTROL_OFFSET 0x0724
+#define EXYNOS5_SATAPHY_PMU_ENABLE BIT(0)
+#define EXYNOS5_SATA_RESET 0x4
+#define RESET_GLOBAL_RST_N BIT(0)
+#define RESET_CMN_RST_N BIT(1)
+#define RESET_CMN_BLOCK_RST_N BIT(2)
+#define RESET_CMN_I2C_RST_N BIT(3)
+#define RESET_TX_RX_PIPE_RST_N BIT(4)
+#define RESET_TX_RX_BLOCK_RST_N BIT(5)
+#define RESET_TX_RX_I2C_RST_N (BIT(6) | BIT(7))
+#define LINK_RESET 0xf0000
+#define EXYNOS5_SATA_MODE0 0x10
+#define SATA_SPD_GEN3 BIT(1)
+#define EXYNOS5_SATA_CTRL0 0x14
+#define CTRL0_P0_PHY_CALIBRATED_SEL BIT(9)
+#define CTRL0_P0_PHY_CALIBRATED BIT(8)
+#define EXYNOS5_SATA_PHSATA_CTRLM 0xe0
+#define PHCTRLM_REF_RATE BIT(1)
+#define PHCTRLM_HIGH_SPEED BIT(0)
+#define EXYNOS5_SATA_PHSATA_STATM 0xf0
+#define PHSTATM_PLL_LOCKED BIT(0)
+
+#define PHY_PLL_TIMEOUT (usecs_to_jiffies(1000))
+
+struct exynos_sata_phy {
+ struct phy *phy;
+ struct clk *phyclk;
+ void __iomem *regs;
+ struct regmap *pmureg;
+ struct i2c_client *client;
+};
+
+static int wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit,
+ u32 status)
+{
+ unsigned long timeout = jiffies + PHY_PLL_TIMEOUT;
+
+ while (time_before(jiffies, timeout)) {
+ if ((readl(base + reg) & checkbit) == status)
+ return 0;
+ }
+
+ return -EFAULT;
+}
+
+static int exynos_sata_phy_power_on(struct phy *phy)
+{
+ struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
+
+ return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
+ EXYNOS5_SATAPHY_PMU_ENABLE, true);
+
+}
+
+static int exynos_sata_phy_power_off(struct phy *phy)
+{
+ struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
+
+ return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
+ EXYNOS5_SATAPHY_PMU_ENABLE, false);
+
+}
+
+static int exynos_sata_phy_init(struct phy *phy)
+{
+ u32 val = 0;
+ int ret = 0;
+ u8 buf[] = { 0x3a, 0x0b };
+ struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
+
+ ret = regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
+ EXYNOS5_SATAPHY_PMU_ENABLE, true);
+ if (ret != 0)
+ dev_err(&sata_phy->phy->dev, "phy init failed\n");
+
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+ val |= RESET_GLOBAL_RST_N | RESET_CMN_RST_N | RESET_CMN_BLOCK_RST_N
+ | RESET_CMN_I2C_RST_N | RESET_TX_RX_PIPE_RST_N
+ | RESET_TX_RX_BLOCK_RST_N | RESET_TX_RX_I2C_RST_N;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+ val |= LINK_RESET;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+ val |= RESET_CMN_RST_N;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+ val &= ~PHCTRLM_REF_RATE;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+
+ /* High speed enable for Gen3 */
+ val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+ val |= PHCTRLM_HIGH_SPEED;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_CTRL0);
+ val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_MODE0);
+ val |= SATA_SPD_GEN3;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_MODE0);
+
+ ret = i2c_master_send(sata_phy->client, buf, sizeof(buf));
+ if (ret < 0)
+ return ret;
+
+ /* release cmu reset */
+ val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+ val &= ~RESET_CMN_RST_N;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+ val |= RESET_CMN_RST_N;
+ writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+ ret = wait_for_reg_status(sata_phy->regs,
+ EXYNOS5_SATA_PHSATA_STATM,
+ PHSTATM_PLL_LOCKED, 1);
+ if (ret < 0)
+ dev_err(&sata_phy->phy->dev,
+ "PHY PLL locking failed\n");
+ return ret;
+}
+
+static struct phy_ops exynos_sata_phy_ops = {
+ .init = exynos_sata_phy_init,
+ .power_on = exynos_sata_phy_power_on,
+ .power_off = exynos_sata_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int exynos_sata_phy_probe(struct platform_device *pdev)
+{
+ struct exynos_sata_phy *sata_phy;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct phy_provider *phy_provider;
+ struct device_node *node;
+ int ret = 0;
+
+ sata_phy = devm_kzalloc(dev, sizeof(*sata_phy), GFP_KERNEL);
+ if (!sata_phy)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ sata_phy->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(sata_phy->regs))
+ return PTR_ERR(sata_phy->regs);
+
+ sata_phy->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "samsung,syscon-phandle");
+ if (IS_ERR(sata_phy->pmureg)) {
+ dev_err(dev, "syscon regmap lookup failed.\n");
+ return PTR_ERR(sata_phy->pmureg);
+ }
+
+ node = of_parse_phandle(dev->of_node,
+ "samsung,exynos-sataphy-i2c-phandle", 0);
+ if (!node)
+ return -EINVAL;
+
+ sata_phy->client = of_find_i2c_device_by_node(node);
+ if (!sata_phy->client)
+ return -EPROBE_DEFER;
+
+ dev_set_drvdata(dev, sata_phy);
+
+ sata_phy->phyclk = devm_clk_get(dev, "sata_phyctrl");
+ if (IS_ERR(sata_phy->phyclk)) {
+ dev_err(dev, "failed to get clk for PHY\n");
+ return PTR_ERR(sata_phy->phyclk);
+ }
+
+ ret = clk_prepare_enable(sata_phy->phyclk);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable source clk\n");
+ return ret;
+ }
+
+ sata_phy->phy = devm_phy_create(dev, NULL, &exynos_sata_phy_ops);
+ if (IS_ERR(sata_phy->phy)) {
+ clk_disable_unprepare(sata_phy->phyclk);
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(sata_phy->phy);
+ }
+
+ phy_set_drvdata(sata_phy->phy, sata_phy);
+
+ phy_provider = devm_of_phy_provider_register(dev,
+ of_phy_simple_xlate);
+ if (IS_ERR(phy_provider)) {
+ clk_disable_unprepare(sata_phy->phyclk);
+ return PTR_ERR(phy_provider);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id exynos_sata_phy_of_match[] = {
+ { .compatible = "samsung,exynos5250-sata-phy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, exynos_sata_phy_of_match);
+
+static struct platform_driver exynos_sata_phy_driver = {
+ .probe = exynos_sata_phy_probe,
+ .driver = {
+ .of_match_table = exynos_sata_phy_of_match,
+ .name = "samsung,sata-phy",
+ }
+};
+module_platform_driver(exynos_sata_phy_driver);
+
+MODULE_DESCRIPTION("Samsung SerDes PHY driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Girish K S <ks.giri@samsung.com>");
+MODULE_AUTHOR("Yuvaraj C D <yuvaraj.cd@samsung.com>");
Code Review / kvmfornfv.git / blobdiff