phy-mvebu-sata.c
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/*
* phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
*
* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
*
* 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 = devm_phy_create(&pdev->dev, &phy_mvebu_sata_ops, NULL);
if (IS_ERR(phy))
return PTR_ERR(phy);
phy_set_drvdata(phy, priv);
phy_provider = devm_of_phy_provider_register(&pdev->dev,
of_phy_simple_xlate);
if (IS_ERR(phy_provider))
return PTR_ERR(phy_provider);
/* 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@lunn.ch>");
MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver");
MODULE_LICENSE("GPL v2");