Adding platform driver and I2C client driver for SATA PHY controller for Samsung Exynos5250. The PHY controller in Exynos5250 has both the APB interface and I2C client interface, hence it requires both a platform driver and an I2C client driver. The PHY controller's primary charecteristics are handled through the APB interface, facilitated by the platform driver and the 40 bit interface should be enabled through the I2C interface, facilitated by the I2C client driver. Further, this PHY controller driver uses PHY framework introduced by this patchset. The driver registers its initialization/shutdown call back to the framework and corresponding port this PHY controller is assciated with gets this PHY and initializes it. Signed-off-by: Vasanth Ananthan <vasanth.a@xxxxxxxxxxx> --- arch/arm/mach-exynos/include/mach/regs-pmu.h | 3 + arch/arm/mach-exynos/include/mach/regs-sata.h | 29 +++ drivers/ata/Makefile | 2 +- drivers/ata/sata_exynos_phy.c | 265 +++++++++++++++++++++++++ 4 files changed, 298 insertions(+), 1 deletion(-) 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-pmu.h b/arch/arm/mach-exynos/include/mach/regs-pmu.h index 3f30aa1..fd813d9 100644 --- a/arch/arm/mach-exynos/include/mach/regs-pmu.h +++ b/arch/arm/mach-exynos/include/mach/regs-pmu.h @@ -369,4 +369,7 @@ #define EXYNOS5_OPTION_USE_RETENTION (1 << 4) +/* Only for EXYNOS5250 */ +#define EXYNOS5_SATA_PHY_CONTROL S5P_PMUREG(0x0724) + #endif /* __ASM_ARCH_REGS_PMU_H */ 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 3d2d128..7add682 100644 --- a/drivers/ata/Makefile +++ b/drivers/ata/Makefile @@ -10,7 +10,7 @@ obj-$(CONFIG_SATA_INIC162X) += sata_inic162x.o obj-$(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_PHY) += sata_phy.o sata_exynos_phy.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..f48fd2f --- /dev/null +++ b/drivers/ata/sata_exynos_phy.c @@ -0,0 +1,265 @@ +/* + * 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 <linux/of_address.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; + struct sata_phy phy; +}; + +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) +{ + unsigned long timeout = jiffies + usecs_to_jiffies(1000); + + while (time_before(jiffies, timeout)) { + if (sata_is_reg(base, reg, checkbit, status)) + return true; + } + + return false; +} + +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 = container_of(phy, struct exynos_sata_phy, phy); + + ret = clk_enable(sata_phy->clk); + if (ret < 0) { + dev_err(phy->dev, "failed to enable source clk\n"); + return ret; + } + + if (sata_is_reg(sata_phy->mmio , EXYNOS5_SATA_CTRL0, + CTRL0_P0_PHY_CALIBRATED, CTRL0_P0_PHY_CALIBRATED)) + return 0; + + 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(0x2, sata_phy->mmio + EXYNOS5_SATA_MODE0); + + ret = i2c_master_send(i2c_client, buf, sizeof(buf)); + if (ret < 0) + return -ENXIO; + + /* 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 = container_of(phy, struct exynos_sata_phy, phy); + 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 device *dev = &pdev->dev; + int ret = 0; + + sataphy = devm_kzalloc(dev, sizeof(struct exynos_sata_phy), GFP_KERNEL); + if (!sataphy) { + dev_err(dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + sataphy->mmio = of_iomap(dev->of_node, 0); + if (!sataphy->mmio) { + dev_err(dev, "failed to remap IO\n"); + return -EADDRNOTAVAIL; + } + + 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 err_iomap; + } + + sataphy->phy.init = sataphy_init; + sataphy->phy.shutdown = sataphy_shutdown; + sataphy->phy.dev = dev; + + ret = sata_add_phy(&sataphy->phy); + if (ret < 0) { + dev_err(dev, "PHY not registered with framework\n"); + goto err_iomap; + } + + ret = i2c_add_driver(&sataphy_i2c_driver); + if (ret < 0) + goto err_phy; + + platform_set_drvdata(pdev, sataphy); + + return ret; + + err_phy: + sata_remove_phy(&sataphy->phy); + + err_iomap: + iounmap(sataphy->mmio); + + return ret; +} + +static int sata_phy_remove(struct platform_device *pdev) +{ + struct exynos_sata_phy *sataphy; + + sataphy = platform_get_drvdata(pdev); + iounmap(sataphy->mmio); + i2c_del_driver(&sataphy_i2c_driver); + sata_remove_phy(&sataphy->phy); + + return 0; +} + +static const struct of_device_id sata_phy_of_match[] = { + { .compatible = "samsung,exynos5250-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 = (void *)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"); -- 1.7.9.5 -- 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
