This patch adds a platform driver and I2C client driver for SATA PHY controller Signed-off-by: Vasanth Ananthan <vasanth.a@xxxxxxxxxxx> --- arch/arm/mach-exynos/include/mach/regs-sata.h | 29 +++ drivers/ata/Makefile | 2 +- drivers/ata/sata_exynos_phy.c | 300 +++++++++++++++++++++++++ 3 files changed, 330 insertions(+), 1 deletions(-) create mode 100644 arch/arm/mach-exynos/include/mach/regs-sata.h create mode 100644 drivers/ata/sata_exynos_phy.c diff --git a/arch/arm/mach-exynos/include/mach/regs-sata.h b/arch/arm/mach-exynos/include/mach/regs-sata.h new file mode 100644 index 0000000..80dd564 --- /dev/null +++ b/arch/arm/mach-exynos/include/mach/regs-sata.h @@ -0,0 +1,29 @@ +/* + * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * EXYNOS - SATA PHY controller definition + * + * 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. +*/ + +#define EXYNOS5_SATA_RESET 0x4 +#define RESET_CMN_RST_N (1 << 1) +#define LINK_RESET 0xF0000 + +#define EXYNOS5_SATA_MODE0 0x10 + +#define EXYNOS5_SATA_CTRL0 0x14 +#define CTRL0_P0_PHY_CALIBRATED_SEL (1 << 9) +#define CTRL0_P0_PHY_CALIBRATED (1 << 8) + +#define EXYNOS5_SATA_PHSATA_CTRLM 0xE0 +#define PHCTRLM_REF_RATE (1 << 1) +#define PHCTRLM_HIGH_SPEED (1 << 0) + +#define EXYNOS5_SATA_PHSATA_STATM 0xF0 +#define PHSTATM_PLL_LOCKED (1 << 0) + +#define SATA_PHY_CON_RESET 0xF003F diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index 43bb38e..6a3a8ee 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -11,7 +11,7 @@ obj-$(CONFIG_SATA_SIL24) += sata_sil24.o obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o obj-$(CONFIG_SATA_PHY) += sata_phy.o -obj-$(CONFIG_SATA_EXYNOS) += sata_exynos.o libahci.o +obj-$(CONFIG_SATA_EXYNOS) += sata_exynos.o sata_exynos_phy.o libahci.o # SFF w/ custom DMA obj-$(CONFIG_PDC_ADMA) += pdc_adma.o diff --git a/drivers/ata/sata_exynos_phy.c b/drivers/ata/sata_exynos_phy.c new file mode 100644 index 0000000..ec61db5 --- /dev/null +++ b/drivers/ata/sata_exynos_phy.c @@ -0,0 +1,300 @@ +/* + * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * EXYNOS - SATA PHY controller driver + * + * 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/module.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/ahci_platform.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/io.h> + +#include <plat/cpu.h> + +#include <mach/irqs.h> +#include <mach/map.h> +#include <mach/regs-pmu.h> +#include <mach/regs-sata.h> + +#include "sata_phy.h" + +#define SATA_TIME_LIMIT 1000 + +static struct i2c_client *i2c_client; + +static struct i2c_driver sataphy_i2c_driver; + +struct exynos_sata_phy { + void __iomem *mmio; + struct resource *mem; + struct clk *clk; +}; + +static bool sata_is_reg(void __iomem *base, u32 reg, u32 checkbit, u32 status) +{ + if ((readl(base + reg) & checkbit) == status) + return true; + else + return false; +} + +static bool wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit, + u32 status) +{ + u16 time_limit_cnt = 0; + while (!sata_is_reg(base, reg, checkbit, status)) { + if (time_limit_cnt == SATA_TIME_LIMIT) + return false; + udelay(1000); + time_limit_cnt++; + } + return true; +} + +static int sataphy_init(struct sata_phy *phy) +{ + int ret; + u32 val; + + /* Values to be written to enable 40 bits interface */ + u8 buf[] = { 0x3A, 0x0B }; + + struct exynos_sata_phy *sata_phy; + + if (!i2c_client) + return -EPROBE_DEFER; + + sata_phy = (struct exynos_sata_phy *)phy->priv_data; + + clk_enable(sata_phy->clk); + + writel(S5P_PMU_SATA_PHY_CONTROL_EN, EXYNOS5_SATA_PHY_CONTROL); + + val = 0; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_RESET); + val |= 0xFF; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_RESET); + val |= LINK_RESET; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_RESET); + val |= RESET_CMN_RST_N; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_PHSATA_CTRLM); + val &= ~PHCTRLM_REF_RATE; + writel(val, sata_phy->mmio + EXYNOS5_SATA_PHSATA_CTRLM); + + /* High speed enable for Gen3 */ + val = readl(sata_phy->mmio + EXYNOS5_SATA_PHSATA_CTRLM); + val |= PHCTRLM_HIGH_SPEED; + writel(val, sata_phy->mmio + EXYNOS5_SATA_PHSATA_CTRLM); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_CTRL0); + val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED; + writel(val, sata_phy->mmio + EXYNOS5_SATA_CTRL0); + + writel(SATA_PHY_GENERATION3, sata_phy->mmio + EXYNOS5_SATA_MODE0); + + ret = i2c_master_send(i2c_client, buf, sizeof(buf)); + if (ret < 0) + return -EINVAL; + + /* release cmu reset */ + val = readl(sata_phy->mmio + EXYNOS5_SATA_RESET); + val &= ~RESET_CMN_RST_N; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + val = readl(sata_phy->mmio + EXYNOS5_SATA_RESET); + val |= RESET_CMN_RST_N; + writel(val, sata_phy->mmio + EXYNOS5_SATA_RESET); + + if (wait_for_reg_status(sata_phy->mmio, EXYNOS5_SATA_PHSATA_STATM, + PHSTATM_PLL_LOCKED, 1)) { + return 0; + } + return -EINVAL; +} + +static int sataphy_shutdown(struct sata_phy *phy) +{ + + struct exynos_sata_phy *sata_phy; + + sata_phy = (struct exynos_sata_phy *)phy->priv_data; + + clk_disable(sata_phy->clk); + + return 0; +} + +static int __init sata_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *i2c_id) +{ + i2c_client = client; + return 0; +} + +static int __init sata_phy_probe(struct platform_device *pdev) +{ + struct exynos_sata_phy *sataphy; + struct sata_phy *phy; + struct resource *res; + struct device *dev = &pdev->dev; + int ret = 0; + + phy = kzalloc(sizeof(struct sata_phy), GFP_KERNEL); + if (!phy) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + ret = -ENOMEM; + goto out; + } + + sataphy = kzalloc(sizeof(struct exynos_sata_phy), GFP_KERNEL); + if (!sataphy) { + dev_err(dev, "failed to allocate memory\n"); + ret = -ENOMEM; + goto err0; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "Could not find IO resource\n"); + ret = -EINVAL; + goto err1; + } + + sataphy->mem = devm_request_mem_region(dev, res->start, + resource_size(res), pdev->name); + if (!sataphy->mem) { + dev_err(dev, "Could not request IO resource\n"); + ret = -EINVAL; + goto err1; + } + + sataphy->mmio = + devm_ioremap(dev, res->start, resource_size(res)); + if (!sataphy->mmio) { + dev_err(dev, "failed to remap IO\n"); + ret = -ENOMEM; + goto err2; + } + + sataphy->clk = devm_clk_get(dev, "sata-phy"); + if (IS_ERR(sataphy->clk)) { + dev_err(dev, "failed to get clk for PHY\n"); + ret = PTR_ERR(sataphy->clk); + goto err3; + } + + phy->init = sataphy_init; + phy->shutdown = sataphy_shutdown; + phy->priv_data = (void *)sataphy; + phy->dev = dev; + + ret = sata_add_phy(phy, SATA_PHY_GENERATION3); + if (ret < 0) + goto err4; + + ret = i2c_add_driver(&sataphy_i2c_driver); + if (ret < 0) + goto err5; + + platform_set_drvdata(pdev, phy); + + return ret; + + err5: + sata_remove_phy(phy); + + err4: + clk_disable(sataphy->clk); + devm_clk_put(dev, sataphy->clk); + + err3: + devm_iounmap(dev, sataphy->mmio); + + err2: + devm_release_mem_region(dev, res->start, resource_size(res)); + + err1: + kfree(sataphy); + + err0: + kfree(phy); + + out: + return ret; +} + +static int sata_phy_remove(struct platform_device *pdev) +{ + struct sata_phy *phy; + struct exynos_sata_phy *sataphy; + + phy = platform_get_drvdata(pdev); + + sataphy = (struct exynos_sata_phy *)phy->priv_data; + sata_remove_phy(phy); + + kfree(sataphy); + kfree(phy); + + return 0; +} + +static const struct of_device_id sata_phy_of_match[] = { + { .compatible = "samsung,exynos5-sata-phy", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, sata_phy_of_match); + +static const struct i2c_device_id phy_i2c_device_match[] = { + { "sata-phy", 0 }, +}; + +MODULE_DEVICE_TABLE(of, phy_i2c_device_match); + +static struct platform_driver sata_phy_driver = { + .probe = sata_phy_probe, + .remove = sata_phy_remove, + .driver = { + .name = "sata-phy", + .owner = THIS_MODULE, + .of_match_table = sata_phy_of_match, + }, +}; + +static struct i2c_driver sataphy_i2c_driver = { + .driver = { + .name = "sata-phy-i2c", + .owner = THIS_MODULE, + .of_match_table = phy_i2c_device_match, + }, + .probe = sata_i2c_probe, + .id_table = phy_i2c_device_match, +}; + +module_platform_driver(sata_phy_driver); + +MODULE_DESCRIPTION("EXYNOS SATA PHY DRIVER"); +MODULE_AUTHOR("Vasanth Ananthan, <vasanth.a@xxxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
