10b56e9a7SVivek Gautam /* 20b56e9a7SVivek Gautam * Samsung SATA SerDes(PHY) driver 30b56e9a7SVivek Gautam * 40b56e9a7SVivek Gautam * Copyright (C) 2013 Samsung Electronics Co., Ltd. 50b56e9a7SVivek Gautam * Authors: Girish K S <ks.giri@samsung.com> 60b56e9a7SVivek Gautam * Yuvaraj Kumar C D <yuvaraj.cd@samsung.com> 70b56e9a7SVivek Gautam * 80b56e9a7SVivek Gautam * This program is free software; you can redistribute it and/or modify 90b56e9a7SVivek Gautam * it under the terms of the GNU General Public License version 2 as 100b56e9a7SVivek Gautam * published by the Free Software Foundation. 110b56e9a7SVivek Gautam */ 120b56e9a7SVivek Gautam 130b56e9a7SVivek Gautam #include <linux/clk.h> 140b56e9a7SVivek Gautam #include <linux/delay.h> 150b56e9a7SVivek Gautam #include <linux/io.h> 160b56e9a7SVivek Gautam #include <linux/i2c.h> 170b56e9a7SVivek Gautam #include <linux/kernel.h> 180b56e9a7SVivek Gautam #include <linux/module.h> 190b56e9a7SVivek Gautam #include <linux/of.h> 200b56e9a7SVivek Gautam #include <linux/of_address.h> 210b56e9a7SVivek Gautam #include <linux/phy/phy.h> 220b56e9a7SVivek Gautam #include <linux/platform_device.h> 230b56e9a7SVivek Gautam #include <linux/regmap.h> 240b56e9a7SVivek Gautam #include <linux/spinlock.h> 250b56e9a7SVivek Gautam #include <linux/mfd/syscon.h> 260b56e9a7SVivek Gautam 270b56e9a7SVivek Gautam #define SATAPHY_CONTROL_OFFSET 0x0724 280b56e9a7SVivek Gautam #define EXYNOS5_SATAPHY_PMU_ENABLE BIT(0) 290b56e9a7SVivek Gautam #define EXYNOS5_SATA_RESET 0x4 300b56e9a7SVivek Gautam #define RESET_GLOBAL_RST_N BIT(0) 310b56e9a7SVivek Gautam #define RESET_CMN_RST_N BIT(1) 320b56e9a7SVivek Gautam #define RESET_CMN_BLOCK_RST_N BIT(2) 330b56e9a7SVivek Gautam #define RESET_CMN_I2C_RST_N BIT(3) 340b56e9a7SVivek Gautam #define RESET_TX_RX_PIPE_RST_N BIT(4) 350b56e9a7SVivek Gautam #define RESET_TX_RX_BLOCK_RST_N BIT(5) 360b56e9a7SVivek Gautam #define RESET_TX_RX_I2C_RST_N (BIT(6) | BIT(7)) 370b56e9a7SVivek Gautam #define LINK_RESET 0xf0000 380b56e9a7SVivek Gautam #define EXYNOS5_SATA_MODE0 0x10 390b56e9a7SVivek Gautam #define SATA_SPD_GEN3 BIT(1) 400b56e9a7SVivek Gautam #define EXYNOS5_SATA_CTRL0 0x14 410b56e9a7SVivek Gautam #define CTRL0_P0_PHY_CALIBRATED_SEL BIT(9) 420b56e9a7SVivek Gautam #define CTRL0_P0_PHY_CALIBRATED BIT(8) 430b56e9a7SVivek Gautam #define EXYNOS5_SATA_PHSATA_CTRLM 0xe0 440b56e9a7SVivek Gautam #define PHCTRLM_REF_RATE BIT(1) 450b56e9a7SVivek Gautam #define PHCTRLM_HIGH_SPEED BIT(0) 460b56e9a7SVivek Gautam #define EXYNOS5_SATA_PHSATA_STATM 0xf0 470b56e9a7SVivek Gautam #define PHSTATM_PLL_LOCKED BIT(0) 480b56e9a7SVivek Gautam 490b56e9a7SVivek Gautam #define PHY_PLL_TIMEOUT (usecs_to_jiffies(1000)) 500b56e9a7SVivek Gautam 510b56e9a7SVivek Gautam struct exynos_sata_phy { 520b56e9a7SVivek Gautam struct phy *phy; 530b56e9a7SVivek Gautam struct clk *phyclk; 540b56e9a7SVivek Gautam void __iomem *regs; 550b56e9a7SVivek Gautam struct regmap *pmureg; 560b56e9a7SVivek Gautam struct i2c_client *client; 570b56e9a7SVivek Gautam }; 580b56e9a7SVivek Gautam 590b56e9a7SVivek Gautam static int wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit, 600b56e9a7SVivek Gautam u32 status) 610b56e9a7SVivek Gautam { 620b56e9a7SVivek Gautam unsigned long timeout = jiffies + PHY_PLL_TIMEOUT; 630b56e9a7SVivek Gautam 640b56e9a7SVivek Gautam while (time_before(jiffies, timeout)) { 650b56e9a7SVivek Gautam if ((readl(base + reg) & checkbit) == status) 660b56e9a7SVivek Gautam return 0; 670b56e9a7SVivek Gautam } 680b56e9a7SVivek Gautam 690b56e9a7SVivek Gautam return -EFAULT; 700b56e9a7SVivek Gautam } 710b56e9a7SVivek Gautam 720b56e9a7SVivek Gautam static int exynos_sata_phy_power_on(struct phy *phy) 730b56e9a7SVivek Gautam { 740b56e9a7SVivek Gautam struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy); 750b56e9a7SVivek Gautam 760b56e9a7SVivek Gautam return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET, 770b56e9a7SVivek Gautam EXYNOS5_SATAPHY_PMU_ENABLE, true); 780b56e9a7SVivek Gautam 790b56e9a7SVivek Gautam } 800b56e9a7SVivek Gautam 810b56e9a7SVivek Gautam static int exynos_sata_phy_power_off(struct phy *phy) 820b56e9a7SVivek Gautam { 830b56e9a7SVivek Gautam struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy); 840b56e9a7SVivek Gautam 850b56e9a7SVivek Gautam return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET, 860b56e9a7SVivek Gautam EXYNOS5_SATAPHY_PMU_ENABLE, false); 870b56e9a7SVivek Gautam 880b56e9a7SVivek Gautam } 890b56e9a7SVivek Gautam 900b56e9a7SVivek Gautam static int exynos_sata_phy_init(struct phy *phy) 910b56e9a7SVivek Gautam { 920b56e9a7SVivek Gautam u32 val = 0; 930b56e9a7SVivek Gautam int ret = 0; 940b56e9a7SVivek Gautam u8 buf[] = { 0x3a, 0x0b }; 950b56e9a7SVivek Gautam struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy); 960b56e9a7SVivek Gautam 970b56e9a7SVivek Gautam ret = regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET, 980b56e9a7SVivek Gautam EXYNOS5_SATAPHY_PMU_ENABLE, true); 990b56e9a7SVivek Gautam if (ret != 0) 1000b56e9a7SVivek Gautam dev_err(&sata_phy->phy->dev, "phy init failed\n"); 1010b56e9a7SVivek Gautam 1020b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1030b56e9a7SVivek Gautam 1040b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_RESET); 1050b56e9a7SVivek Gautam val |= RESET_GLOBAL_RST_N | RESET_CMN_RST_N | RESET_CMN_BLOCK_RST_N 1060b56e9a7SVivek Gautam | RESET_CMN_I2C_RST_N | RESET_TX_RX_PIPE_RST_N 1070b56e9a7SVivek Gautam | RESET_TX_RX_BLOCK_RST_N | RESET_TX_RX_I2C_RST_N; 1080b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1090b56e9a7SVivek Gautam 1100b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_RESET); 1110b56e9a7SVivek Gautam val |= LINK_RESET; 1120b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1130b56e9a7SVivek Gautam 1140b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_RESET); 1150b56e9a7SVivek Gautam val |= RESET_CMN_RST_N; 1160b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1170b56e9a7SVivek Gautam 1180b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM); 1190b56e9a7SVivek Gautam val &= ~PHCTRLM_REF_RATE; 1200b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM); 1210b56e9a7SVivek Gautam 1220b56e9a7SVivek Gautam /* High speed enable for Gen3 */ 1230b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM); 1240b56e9a7SVivek Gautam val |= PHCTRLM_HIGH_SPEED; 1250b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM); 1260b56e9a7SVivek Gautam 1270b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_CTRL0); 1280b56e9a7SVivek Gautam val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED; 1290b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0); 1300b56e9a7SVivek Gautam 1310b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_MODE0); 1320b56e9a7SVivek Gautam val |= SATA_SPD_GEN3; 1330b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_MODE0); 1340b56e9a7SVivek Gautam 1350b56e9a7SVivek Gautam ret = i2c_master_send(sata_phy->client, buf, sizeof(buf)); 1360b56e9a7SVivek Gautam if (ret < 0) 1370b56e9a7SVivek Gautam return ret; 1380b56e9a7SVivek Gautam 1390b56e9a7SVivek Gautam /* release cmu reset */ 1400b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_RESET); 1410b56e9a7SVivek Gautam val &= ~RESET_CMN_RST_N; 1420b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1430b56e9a7SVivek Gautam 1440b56e9a7SVivek Gautam val = readl(sata_phy->regs + EXYNOS5_SATA_RESET); 1450b56e9a7SVivek Gautam val |= RESET_CMN_RST_N; 1460b56e9a7SVivek Gautam writel(val, sata_phy->regs + EXYNOS5_SATA_RESET); 1470b56e9a7SVivek Gautam 1480b56e9a7SVivek Gautam ret = wait_for_reg_status(sata_phy->regs, 1490b56e9a7SVivek Gautam EXYNOS5_SATA_PHSATA_STATM, 1500b56e9a7SVivek Gautam PHSTATM_PLL_LOCKED, 1); 1510b56e9a7SVivek Gautam if (ret < 0) 1520b56e9a7SVivek Gautam dev_err(&sata_phy->phy->dev, 1530b56e9a7SVivek Gautam "PHY PLL locking failed\n"); 1540b56e9a7SVivek Gautam return ret; 1550b56e9a7SVivek Gautam } 1560b56e9a7SVivek Gautam 1570b56e9a7SVivek Gautam static const struct phy_ops exynos_sata_phy_ops = { 1580b56e9a7SVivek Gautam .init = exynos_sata_phy_init, 1590b56e9a7SVivek Gautam .power_on = exynos_sata_phy_power_on, 1600b56e9a7SVivek Gautam .power_off = exynos_sata_phy_power_off, 1610b56e9a7SVivek Gautam .owner = THIS_MODULE, 1620b56e9a7SVivek Gautam }; 1630b56e9a7SVivek Gautam 1640b56e9a7SVivek Gautam static int exynos_sata_phy_probe(struct platform_device *pdev) 1650b56e9a7SVivek Gautam { 1660b56e9a7SVivek Gautam struct exynos_sata_phy *sata_phy; 1670b56e9a7SVivek Gautam struct device *dev = &pdev->dev; 1680b56e9a7SVivek Gautam struct resource *res; 1690b56e9a7SVivek Gautam struct phy_provider *phy_provider; 1700b56e9a7SVivek Gautam struct device_node *node; 1710b56e9a7SVivek Gautam int ret = 0; 1720b56e9a7SVivek Gautam 1730b56e9a7SVivek Gautam sata_phy = devm_kzalloc(dev, sizeof(*sata_phy), GFP_KERNEL); 1740b56e9a7SVivek Gautam if (!sata_phy) 1750b56e9a7SVivek Gautam return -ENOMEM; 1760b56e9a7SVivek Gautam 1770b56e9a7SVivek Gautam res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1780b56e9a7SVivek Gautam 1790b56e9a7SVivek Gautam sata_phy->regs = devm_ioremap_resource(dev, res); 1800b56e9a7SVivek Gautam if (IS_ERR(sata_phy->regs)) 1810b56e9a7SVivek Gautam return PTR_ERR(sata_phy->regs); 1820b56e9a7SVivek Gautam 1830b56e9a7SVivek Gautam sata_phy->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node, 1840b56e9a7SVivek Gautam "samsung,syscon-phandle"); 1850b56e9a7SVivek Gautam if (IS_ERR(sata_phy->pmureg)) { 1860b56e9a7SVivek Gautam dev_err(dev, "syscon regmap lookup failed.\n"); 1870b56e9a7SVivek Gautam return PTR_ERR(sata_phy->pmureg); 1880b56e9a7SVivek Gautam } 1890b56e9a7SVivek Gautam 1900b56e9a7SVivek Gautam node = of_parse_phandle(dev->of_node, 1910b56e9a7SVivek Gautam "samsung,exynos-sataphy-i2c-phandle", 0); 1920b56e9a7SVivek Gautam if (!node) 1930b56e9a7SVivek Gautam return -EINVAL; 1940b56e9a7SVivek Gautam 1950b56e9a7SVivek Gautam sata_phy->client = of_find_i2c_device_by_node(node); 1960b56e9a7SVivek Gautam if (!sata_phy->client) 1970b56e9a7SVivek Gautam return -EPROBE_DEFER; 1980b56e9a7SVivek Gautam 1990b56e9a7SVivek Gautam dev_set_drvdata(dev, sata_phy); 2000b56e9a7SVivek Gautam 2010b56e9a7SVivek Gautam sata_phy->phyclk = devm_clk_get(dev, "sata_phyctrl"); 2020b56e9a7SVivek Gautam if (IS_ERR(sata_phy->phyclk)) { 2030b56e9a7SVivek Gautam dev_err(dev, "failed to get clk for PHY\n"); 2040b56e9a7SVivek Gautam return PTR_ERR(sata_phy->phyclk); 2050b56e9a7SVivek Gautam } 2060b56e9a7SVivek Gautam 2070b56e9a7SVivek Gautam ret = clk_prepare_enable(sata_phy->phyclk); 2080b56e9a7SVivek Gautam if (ret < 0) { 2090b56e9a7SVivek Gautam dev_err(dev, "failed to enable source clk\n"); 2100b56e9a7SVivek Gautam return ret; 2110b56e9a7SVivek Gautam } 2120b56e9a7SVivek Gautam 2130b56e9a7SVivek Gautam sata_phy->phy = devm_phy_create(dev, NULL, &exynos_sata_phy_ops); 2140b56e9a7SVivek Gautam if (IS_ERR(sata_phy->phy)) { 2150b56e9a7SVivek Gautam clk_disable_unprepare(sata_phy->phyclk); 2160b56e9a7SVivek Gautam dev_err(dev, "failed to create PHY\n"); 2170b56e9a7SVivek Gautam return PTR_ERR(sata_phy->phy); 2180b56e9a7SVivek Gautam } 2190b56e9a7SVivek Gautam 2200b56e9a7SVivek Gautam phy_set_drvdata(sata_phy->phy, sata_phy); 2210b56e9a7SVivek Gautam 2220b56e9a7SVivek Gautam phy_provider = devm_of_phy_provider_register(dev, 2230b56e9a7SVivek Gautam of_phy_simple_xlate); 2240b56e9a7SVivek Gautam if (IS_ERR(phy_provider)) { 2250b56e9a7SVivek Gautam clk_disable_unprepare(sata_phy->phyclk); 2260b56e9a7SVivek Gautam return PTR_ERR(phy_provider); 2270b56e9a7SVivek Gautam } 2280b56e9a7SVivek Gautam 2290b56e9a7SVivek Gautam return 0; 2300b56e9a7SVivek Gautam } 2310b56e9a7SVivek Gautam 2320b56e9a7SVivek Gautam static const struct of_device_id exynos_sata_phy_of_match[] = { 2330b56e9a7SVivek Gautam { .compatible = "samsung,exynos5250-sata-phy" }, 2340b56e9a7SVivek Gautam { }, 2350b56e9a7SVivek Gautam }; 2360b56e9a7SVivek Gautam MODULE_DEVICE_TABLE(of, exynos_sata_phy_of_match); 2370b56e9a7SVivek Gautam 2380b56e9a7SVivek Gautam static struct platform_driver exynos_sata_phy_driver = { 2390b56e9a7SVivek Gautam .probe = exynos_sata_phy_probe, 2400b56e9a7SVivek Gautam .driver = { 2410b56e9a7SVivek Gautam .of_match_table = exynos_sata_phy_of_match, 2420b56e9a7SVivek Gautam .name = "samsung,sata-phy", 2430b56e9a7SVivek Gautam } 2440b56e9a7SVivek Gautam }; 2450b56e9a7SVivek Gautam module_platform_driver(exynos_sata_phy_driver); 2460b56e9a7SVivek Gautam 2470b56e9a7SVivek Gautam MODULE_DESCRIPTION("Samsung SerDes PHY driver"); 2480b56e9a7SVivek Gautam MODULE_LICENSE("GPL v2"); 2490b56e9a7SVivek Gautam MODULE_AUTHOR("Girish K S <ks.giri@samsung.com>"); 2500b56e9a7SVivek Gautam MODULE_AUTHOR("Yuvaraj C D <yuvaraj.cd@samsung.com>"); 251