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

[Yuvaraj Kumar]

On Tue, Dec 31, 2013 at 4:18 PM, Kishon Vijay Abraham I <kishon@xxxxxx> 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@xxxxxx>
>>         [2].ata: ahci_platform: Manage SATA PHY
>>                 by Roger Quadros <rogerq@xxxxxx>
>>
>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx>
>> Signed-off-by: Girish K S <ks.giri@xxxxxxxxxxx>
>> Signed-off-by: Vasanth Ananthan <vasanth.a@xxxxxxxxxxx>
>> ---
>> 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@xxxxxxxxxxx>
>> + *
>> + * 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@xxxxxxxxxxx>
>> + *         Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx>
>> + *
>> + * 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/