1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
5 * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/clk.h>
11 #include <linux/phy/phy.h>
13 #include <linux/platform_device.h>
20 #define SATA_PHY_MODE_2 0x0330
21 #define MODE_2_FORCE_PU_TX BIT(0)
22 #define MODE_2_FORCE_PU_RX BIT(1)
23 #define MODE_2_PU_PLL BIT(2)
24 #define MODE_2_PU_IVREF BIT(3)
25 #define SATA_IF_CTRL 0x0050
26 #define CTRL_PHY_SHUTDOWN BIT(9)
28 static int phy_mvebu_sata_power_on(struct phy *phy)
30 struct priv *priv = phy_get_drvdata(phy);
33 clk_prepare_enable(priv->clk);
35 /* Enable PLL and IVREF */
36 reg = readl(priv->base + SATA_PHY_MODE_2);
37 reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
38 MODE_2_PU_PLL | MODE_2_PU_IVREF);
39 writel(reg , priv->base + SATA_PHY_MODE_2);
42 reg = readl(priv->base + SATA_IF_CTRL);
43 reg &= ~CTRL_PHY_SHUTDOWN;
44 writel(reg, priv->base + SATA_IF_CTRL);
46 clk_disable_unprepare(priv->clk);
51 static int phy_mvebu_sata_power_off(struct phy *phy)
53 struct priv *priv = phy_get_drvdata(phy);
56 clk_prepare_enable(priv->clk);
58 /* Disable PLL and IVREF */
59 reg = readl(priv->base + SATA_PHY_MODE_2);
60 reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
61 MODE_2_PU_PLL | MODE_2_PU_IVREF);
62 writel(reg, priv->base + SATA_PHY_MODE_2);
65 reg = readl(priv->base + SATA_IF_CTRL);
66 reg |= CTRL_PHY_SHUTDOWN;
67 writel(reg, priv->base + SATA_IF_CTRL);
69 clk_disable_unprepare(priv->clk);
74 static const struct phy_ops phy_mvebu_sata_ops = {
75 .power_on = phy_mvebu_sata_power_on,
76 .power_off = phy_mvebu_sata_power_off,
80 static int phy_mvebu_sata_probe(struct platform_device *pdev)
82 struct phy_provider *phy_provider;
87 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
91 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
92 priv->base = devm_ioremap_resource(&pdev->dev, res);
93 if (IS_ERR(priv->base))
94 return PTR_ERR(priv->base);
96 priv->clk = devm_clk_get(&pdev->dev, "sata");
97 if (IS_ERR(priv->clk))
98 return PTR_ERR(priv->clk);
100 phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
104 phy_set_drvdata(phy, priv);
106 phy_provider = devm_of_phy_provider_register(&pdev->dev,
107 of_phy_simple_xlate);
108 if (IS_ERR(phy_provider))
109 return PTR_ERR(phy_provider);
111 /* The boot loader may of left it on. Turn it off. */
112 phy_mvebu_sata_power_off(phy);
117 static const struct of_device_id phy_mvebu_sata_of_match[] = {
118 { .compatible = "marvell,mvebu-sata-phy" },
122 static struct platform_driver phy_mvebu_sata_driver = {
123 .probe = phy_mvebu_sata_probe,
125 .name = "phy-mvebu-sata",
126 .of_match_table = phy_mvebu_sata_of_match,
129 builtin_platform_driver(phy_mvebu_sata_driver);