130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
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*
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* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/phy/phy.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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struct priv {
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struct clk *clk;
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void __iomem *base;
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};
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#define SATA_PHY_MODE_2 0x0330
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#define MODE_2_FORCE_PU_TX BIT(0)
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#define MODE_2_FORCE_PU_RX BIT(1)
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#define MODE_2_PU_PLL BIT(2)
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#define MODE_2_PU_IVREF BIT(3)
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#define SATA_IF_CTRL 0x0050
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#define CTRL_PHY_SHUTDOWN BIT(9)
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static int phy_mvebu_sata_power_on(struct phy *phy)
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{
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struct priv *priv = phy_get_drvdata(phy);
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u32 reg;
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clk_prepare_enable(priv->clk);
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/* Enable PLL and IVREF */
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reg = readl(priv->base + SATA_PHY_MODE_2);
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reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
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MODE_2_PU_PLL | MODE_2_PU_IVREF);
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writel(reg , priv->base + SATA_PHY_MODE_2);
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/* Enable PHY */
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reg = readl(priv->base + SATA_IF_CTRL);
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reg &= ~CTRL_PHY_SHUTDOWN;
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writel(reg, priv->base + SATA_IF_CTRL);
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static int phy_mvebu_sata_power_off(struct phy *phy)
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{
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struct priv *priv = phy_get_drvdata(phy);
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u32 reg;
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clk_prepare_enable(priv->clk);
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/* Disable PLL and IVREF */
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reg = readl(priv->base + SATA_PHY_MODE_2);
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reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
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MODE_2_PU_PLL | MODE_2_PU_IVREF);
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writel(reg, priv->base + SATA_PHY_MODE_2);
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/* Disable PHY */
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reg = readl(priv->base + SATA_IF_CTRL);
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reg |= CTRL_PHY_SHUTDOWN;
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writel(reg, priv->base + SATA_IF_CTRL);
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static const struct phy_ops phy_mvebu_sata_ops = {
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.power_on = phy_mvebu_sata_power_on,
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.power_off = phy_mvebu_sata_power_off,
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.owner = THIS_MODULE,
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};
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static int phy_mvebu_sata_probe(struct platform_device *pdev)
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{
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struct phy_provider *phy_provider;
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struct resource *res;
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struct priv *priv;
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struct phy *phy;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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priv->clk = devm_clk_get(&pdev->dev, "sata");
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if (IS_ERR(priv->clk))
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return PTR_ERR(priv->clk);
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phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
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if (IS_ERR(phy))
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return PTR_ERR(phy);
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phy_set_drvdata(phy, priv);
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phy_provider = devm_of_phy_provider_register(&pdev->dev,
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of_phy_simple_xlate);
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if (IS_ERR(phy_provider))
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return PTR_ERR(phy_provider);
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/* The boot loader may of left it on. Turn it off. */
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phy_mvebu_sata_power_off(phy);
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return 0;
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}
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static const struct of_device_id phy_mvebu_sata_of_match[] = {
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{ .compatible = "marvell,mvebu-sata-phy" },
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{ },
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};
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static struct platform_driver phy_mvebu_sata_driver = {
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.probe = phy_mvebu_sata_probe,
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.driver = {
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.name = "phy-mvebu-sata",
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.of_match_table = phy_mvebu_sata_of_match,
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}
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};
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builtin_platform_driver(phy_mvebu_sata_driver);
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