139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/*
|
|
* 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 const 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);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
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, NULL, &phy_mvebu_sata_ops);
|
|
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",
|
|
.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");
|