Hi,
On Wednesday 18 December 2013 01:51 AM, Andrew Lunn wrote:
> Kirkwood and Dove can turn the SATA phy on and off. Add a PHY driver
> to control this.
>
> Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
> ---
> v1->v2:
> Use #defines instead of magic values
> select GENERIC_PHY in Kconfig.
> ---
> drivers/phy/Kconfig | 6 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-mvebu-sata.c | 137 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 144 insertions(+)
> create mode 100644 drivers/phy/phy-mvebu-sata.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index a344f3d52361..7464d31fcbd1 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -21,6 +21,12 @@ config PHY_EXYNOS_MIPI_VIDEO
> Support for MIPI CSI-2 and MIPI DSI DPHY found on Samsung S5P
> and EXYNOS SoCs.
>
> +config PHY_MVEBU_SATA
> + def_bool y
> + depends on ARCH_KIRKWOOD || ARCH_DOVE
> + depends on OF
> + select GENERIC_PHY
> +
> config OMAP_USB2
> tristate "OMAP USB2 PHY Driver"
> depends on ARCH_OMAP2PLUS
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index d0caae9cfb83..4e4adc96f753 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -5,5 +5,6 @@
> obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
> 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
> diff --git a/drivers/phy/phy-mvebu-sata.c b/drivers/phy/phy-mvebu-sata.c
> new file mode 100644
> index 000000000000..d43786f62437
> --- /dev/null
> +++ b/drivers/phy/phy-mvebu-sata.c
> @@ -0,0 +1,137 @@
> +/*
> + * phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
> + *
> + * Copyright (C) 2013 Andrew Lunn <andrew@xxxxxxx>
> + *
> + * 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/kernel.h>
> +#include <linux/module.h>
> +#include <linux/clk.h>
> +#include <linux/phy/phy.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +
> +struct priv {
> + struct clk *clk;
> + void __iomem *base;
> +};
> +
> +#define SATA_PHY_MODE_2 0x0330
> +#define MODE_2_FORCE_PU_TX BIT(0)
> +#define MODE_2_FORCE_PU_RX BIT(1)
> +#define MODE_2_PU_PLL BIT(2)
> +#define MODE_2_PU_IVREF BIT(3)
> +#define SATA_IF_CTRL 0x0050
> +#define CTRL_PHY_SHUTDOWN BIT(9)
> +
> +static int phy_mvebu_sata_power_on(struct phy *phy)
> +{
> + struct priv *priv = phy_get_drvdata(phy);
> + u32 reg;
> +
> + clk_prepare_enable(priv->clk);
> +
> + /* Enable PLL and IVREF */
> + reg = readl(priv->base + SATA_PHY_MODE_2);
> + reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
> + MODE_2_PU_PLL | MODE_2_PU_IVREF);
> + writel(reg , priv->base + SATA_PHY_MODE_2);
> +
> + /* Enable PHY */
> + reg = readl(priv->base + SATA_IF_CTRL);
> + reg &= ~CTRL_PHY_SHUTDOWN;
> + writel(reg, priv->base + SATA_IF_CTRL);
> +
> + clk_disable_unprepare(priv->clk);
> +
> + return 0;
> +}
> +
> +static int phy_mvebu_sata_power_off(struct phy *phy)
> +{
> + struct priv *priv = phy_get_drvdata(phy);
> + u32 reg;
> +
> + clk_prepare_enable(priv->clk);
> +
> + /* Disable PLL and IVREF */
> + reg = readl(priv->base + SATA_PHY_MODE_2);
> + reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
> + MODE_2_PU_PLL | MODE_2_PU_IVREF);
> + writel(reg, priv->base + SATA_PHY_MODE_2);
> +
> + /* Disable PHY */
> + reg = readl(priv->base + SATA_IF_CTRL);
> + reg |= CTRL_PHY_SHUTDOWN;
> + writel(reg, priv->base + SATA_IF_CTRL);
> +
> + clk_disable_unprepare(priv->clk);
> +
> + return 0;
> +}
> +
> +static struct phy_ops phy_mvebu_sata_ops = {
> + .power_on = phy_mvebu_sata_power_on,
> + .power_off = phy_mvebu_sata_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int phy_mvebu_sata_probe(struct platform_device *pdev)
> +{
> + struct phy_provider *phy_provider;
> + struct resource *res;
> + struct priv *priv;
> + struct phy *phy;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(priv->base))
> + return PTR_ERR(priv->base);
> +
> + priv->clk = devm_clk_get(&pdev->dev, "sata");
> + if (IS_ERR(priv->clk))
> + return PTR_ERR(priv->clk);
> +
> + phy_provider = devm_of_phy_provider_register(&pdev->dev,
> + of_phy_simple_xlate);
> + if (IS_ERR(phy_provider))
> + return PTR_ERR(phy_provider);
> +
> + phy = devm_phy_create(&pdev->dev, &phy_mvebu_sata_ops, NULL);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> +
> + phy_set_drvdata(phy, priv);
recently Felipe found a bug and phy_provider should be registered as the last
step. If you can fix that up, I can queue it.
Thanks
Kishon
> +
> + /* The boot loader may of left it on. Turn it off. */
> + phy_mvebu_sata_power_off(phy);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id phy_mvebu_sata_of_match[] = {
> + { .compatible = "marvell,mvebu-sata-phy" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, phy_mvebu_sata_of_match);
> +
> +static struct platform_driver phy_mvebu_sata_driver = {
> + .probe = phy_mvebu_sata_probe,
> + .driver = {
> + .name = "phy-mvebu-sata",
> + .owner = THIS_MODULE,
> + .of_match_table = phy_mvebu_sata_of_match,
> + }
> +};
> +module_platform_driver(phy_mvebu_sata_driver);
> +
> +MODULE_AUTHOR("Andrew Lunn <andrew@xxxxxxx>");
> +MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver");
> +MODULE_LICENSE("GPL v2");
>
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