diff options
Diffstat (limited to 'drivers/phy/samsung/phy-exynos5250-sata.c')
| -rw-r--r-- | drivers/phy/samsung/phy-exynos5250-sata.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/phy/samsung/phy-exynos5250-sata.c b/drivers/phy/samsung/phy-exynos5250-sata.c new file mode 100644 index 000000000000..60e13afcd9b8 --- /dev/null +++ b/drivers/phy/samsung/phy-exynos5250-sata.c @@ -0,0 +1,250 @@ +/* + * 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 const 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>"); |