Hi,
On Wednesday 04 December 2013 10:46 PM, 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>
> ---
> drivers/phy/Kconfig | 5 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-mvebu-sata.c | 130 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 136 insertions(+)
> create mode 100644 drivers/phy/phy-mvebu-sata.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index a344f3d52361..2dd97c3bdab7 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -21,6 +21,11 @@ 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..7d40c3afb090
> --- /dev/null
> +++ b/drivers/phy/phy-mvebu-sata.c
> @@ -0,0 +1,130 @@
> +/*
> + * 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 SATA_IF_CTRL 0x0050
> +
> +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 |= 0xf;
No magic values here. Please add macros for these.
> + writel(reg , priv->base + SATA_PHY_MODE_2);
> +
> + /* Enable PHY */
> + reg = readl(priv->base + SATA_IF_CTRL);
> + reg &= ~0x200;
same here.
> + writel(reg, priv->base + SATA_IF_CTRL);
It would be nice to add mvebu_readl and mvebu_writel apis. No strong feelings
though.
> +
> + 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 &= ~0xf;
no magic values.
> + writel(reg, priv->base + SATA_PHY_MODE_2);
> +
> + /* Disable PHY */
> + reg = readl(priv->base + SATA_IF_CTRL);
> + reg |= 0x200;
same here.
> + 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);
heh.. so your PHY implements a sinlge PHY device onle. You need to have '0' as
phy-cells values in both Documentation and dt data.
Thanks
Kishon
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