[PATCH V4 1/2] Phy: Exynos: Add Exynos5250 sata phy driver

Yuvaraj Kumar
2014-01-02T13:43:31Z

On Tue, Dec 31, 2013 at 4:18 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
> Hi Yuvaraj,
>
>
> On Monday 30 December 2013 06:37 PM, Yuvaraj Kumar C D wrote:
>>
>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>> So this patch also adds a i2c client driver, which is used configure
>> the CMU and TRSV block of exynos5250 SATA PHY.
>>
>> This patch incorporates the generic phy framework to deal with sata
>> phy.
>>
>> This patch depends on the below patches
>> [1].drivers: phy: add generic PHY framework
>> by Kishon Vijay Abraham I<kishon@ti.com>
>> [2].ata: ahci_platform: Manage SATA PHY
>> by Roger Quadros <rogerq@ti.com>
>>
>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>> ---
>> Changes from V3:
>> 1.Moved devm_phy_create before to devm_phy_provider_register.
>>
>> Changes from V2:
>> 1.Removed of_match_table
>> 2.Moved to syscon interface for PMU handling.
>>
>> Changes from V1:
>> 1.Adapted to latest version of Generic PHY framework
>> 2.Removed exynos_sata_i2c_remove function.
>>
>>
>> drivers/phy/Kconfig | 11 ++
>> drivers/phy/Makefile | 1 +
>> drivers/phy/exynos5250_phy_i2c.c | 44 ++++++++
>> drivers/phy/sata_phy_exynos5250.c | 220
>> +++++++++++++++++++++++++++++++++++++
>> drivers/phy/sata_phy_exynos5250.h | 35 ++++++
>> 5 files changed, 311 insertions(+)
>> create mode 100644 drivers/phy/exynos5250_phy_i2c.c
>> create mode 100644 drivers/phy/sata_phy_exynos5250.c
>> create mode 100644 drivers/phy/sata_phy_exynos5250.h
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index d0611b8..6ea124d 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -57,4 +57,15 @@ config PHY_EXYNOS_DP_VIDEO
>> help
>> Support for Display Port PHY found on Samsung EXYNOS SoCs.
>>
>> +config EXYNOS5250_SATA_PHY
>> + tristate "Exynos5250 Sata SerDes/PHY driver"
>> + depends on SOC_EXYNOS5250
>> + select GENERIC_PHY
>> + select MFD_SYSCON if ARCH_EXYNOS5
>> + help
>> + Enable this to support SATA SerDes/Phy found on Samsung's
>> + Exynos5250 based SoCs.This SerDes/Phy supports SATA 1.5 Gb/s,
>> + SATA 3.0 Gb/s, SATA 6.0 Gb/s speeds.It supports one SATA host
>> + port to accept one SATA device.
>> +
>> endmenu
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 4e4adc9..b73eb73 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -8,3 +8,4 @@ obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) +=
>> phy-exynos-mipi-video.o
>> obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o
>> obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
>> obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
>> +obj-$(CONFIG_EXYNOS5250_SATA_PHY) += sata_phy_exynos5250.o
>> exynos5250_phy_i2c.o
>> diff --git a/drivers/phy/exynos5250_phy_i2c.c
>> b/drivers/phy/exynos5250_phy_i2c.c
>> new file mode 100644
>> index 0000000..c0c1150
>> --- /dev/null
>> +++ b/drivers/phy/exynos5250_phy_i2c.c
>> @@ -0,0 +1,44 @@
>> +/*
>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>> + * Author:
>> + * Yuvaraj 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 as published by
>> the
>> + * Free Software Foundation; either version 2 of the License, or (at
>> your
>> + * option) any later version.
>> + *
>> + */
>> +
>> +#include <linux/i2c.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include "sata_phy_exynos5250.h"
>> +
>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>> + const struct i2c_device_id *i2c_id)
>> +{
>> + int ret = 0;
>> + ret = sataphy_attach_i2c_client(client);
>> + if (ret < 0)
>> + return ret;
>> +
>> + dev_info(&client->adapter->dev,
>> + "attached %s into sataphy i2c adapter successfully\n",
>> + client->name);
>> +
>> + return ret;
>> +}
>> +
>> +static const struct i2c_device_id sataphy_i2c_device_match[] = {
>> + { "exynos-sataphy-i2c", 0 },
>> +};
>> +
>> +struct i2c_driver sataphy_i2c_driver = {
>> + .probe = exynos_sata_i2c_probe,
>> + .id_table = sataphy_i2c_device_match,
>> + .driver = {
>> + .name = "exynos-sataphy-i2c",
>> + .owner = THIS_MODULE,
>> + },
>> +};
>> diff --git a/drivers/phy/sata_phy_exynos5250.c
>> b/drivers/phy/sata_phy_exynos5250.c
>> new file mode 100644
>> index 0000000..0765863
>> --- /dev/null
>> +++ b/drivers/phy/sata_phy_exynos5250.c
>> @@ -0,0 +1,220 @@
>> +/*
>> + * 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>
>> +#include "sata_phy_exynos5250.h"
>> +
>> +static struct i2c_client *phy_i2c_client;
>> +
>> +struct exynos_sata_phy {
>> + struct phy *phy;
>> + struct clk *phyclk;
>> + void __iomem *regs;
>> + void __iomem *pmureg;
>> +};
>> +
>> +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 ((readl(base + reg) & checkbit) == status)
>> + return true;
>> + }
>> + return false;
>> +}
>> +
>> +int sataphy_attach_i2c_client(struct i2c_client *sata_phy)
>> +{
>> + if (!sata_phy)
>> + return -EPROBE_DEFER;
>> + else
>> + phy_i2c_client = sata_phy;
>> +
>> + return 0;
>> +}
>> +
>> +static int exynos_sata_phy_power_on(struct phy *phy)
>> +{
>> + struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
>> +
>> + if (sata_phy->pmureg)
>> + regmap_update_bits(sata_phy->pmureg,
>> SATAPHY_CONTROL_OFFSET,
>> + EXYNOS5_SATAPHY_PMU_ENABLE, EXYNOS_SATA_PHY_EN);
>> +
>> + return 0;
>> +}
>> +
>> +static int exynos_sata_phy_power_off(struct phy *phy)
>> +{
>> + struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
>> +
>> + if (sata_phy->pmureg)
>> + regmap_update_bits(sata_phy->pmureg,
>> SATAPHY_CONTROL_OFFSET,
>> + EXYNOS5_SATAPHY_PMU_ENABLE, ~EXYNOS_SATA_PHY_EN);
>> +
>> + return 0;
>> +}
>> +
>> +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);
>> +
>> + if (sata_phy->pmureg)
>> + regmap_update_bits(sata_phy->pmureg,
>> SATAPHY_CONTROL_OFFSET,
>> + EXYNOS5_SATAPHY_PMU_ENABLE, EXYNOS_SATA_PHY_EN);
>> +
>> + writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> + val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> + val |= 0xFF;
>> + 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 |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
>> + writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
>> +
>> + writel(0x2, sata_phy->regs + EXYNOS5_SATA_MODE0);
>> +
>> + ret = i2c_master_send(phy_i2c_client, buf, sizeof(buf));
>> + if (ret < 0)
>> + return -ENXIO;
>> +
>> + /* 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);
>> +
>> + return (wait_for_reg_status(sata_phy->regs,
>> EXYNOS5_SATA_PHSATA_STATM,
>> + PHSTATM_PLL_LOCKED, 1)) ? 0 : -EINVAL;
>> +
>> +}
>> +
>> +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;
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + struct phy_provider *phy_provider;
>> + int ret = 0;
>> +
>> + sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
>> + if (!sata)
>> + return -ENOMEM;
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +
>> + sata->regs = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(sata->regs))
>> + return PTR_ERR(sata->regs);
>> +
>> + sata->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
>> + "samsung,syscon-phandle");
>> + if (!sata->pmureg) {
>> + dev_err(dev, "syscon regmap lookup failed.\n");
>> + return PTR_ERR(sata->pmureg);
>> + }
>> + dev_set_drvdata(dev, sata);
>> +
>> + if (i2c_add_driver(&sataphy_i2c_driver)) {
>> + dev_err(dev, "failed to register sataphy i2c driver\n");
>> + return -ENOENT;
>> + }
>> +
>> + sata->phyclk = devm_clk_get(dev, "sata_phyctrl");
>> + if (IS_ERR(sata->phyclk)) {
>> + dev_err(dev, "failed to get clk for PHY\n");
>> + return PTR_ERR(sata->phyclk);
>> + }
>> +
>> + ret = clk_prepare_enable(sata->phyclk);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to enable source clk\n");
>> + return ret;
>> + }
>> +
>> + sata->phy = devm_phy_create(dev, &exynos_sata_phy_ops, NULL);
>> + if (IS_ERR(sata->phy)) {
>> + dev_err(dev, "failed to create PHY\n");
>> + return PTR_ERR(sata->phy);
>> + }
>> +
>> + phy_provider = devm_of_phy_provider_register(dev,
>> + of_phy_simple_xlate);
>> + if (IS_ERR(phy_provider))
>> + return PTR_ERR(phy_provider);
>> +
>> + phy_set_drvdata(sata->phy, sata);
>
>
> huh.. phy_provider_register should be after phy_set_drvdata.
Sorry, I misunderstood.I will address this with the Bartlomiej
Zolnierkiewicz comments in the next version.
>
> Cheers
> Kishon