1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
4 *
5 * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/clk.h>
11 #include <linux/phy/phy.h>
12 #include <linux/io.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/platform_device.h>
15
16 struct priv {
17 struct clk *clk;
18 void __iomem *base;
19 };
20
21 #define SATA_PHY_MODE_2 0x0330
22 #define MODE_2_FORCE_PU_TX BIT(0)
23 #define MODE_2_FORCE_PU_RX BIT(1)
24 #define MODE_2_PU_PLL BIT(2)
25 #define MODE_2_PU_IVREF BIT(3)
26 #define SATA_IF_CTRL 0x0050
27 #define CTRL_PHY_SHUTDOWN BIT(9)
28
phy_mvebu_sata_power_on(struct phy * phy)29 static int phy_mvebu_sata_power_on(struct phy *phy)
30 {
31 struct priv *priv = phy_get_drvdata(phy);
32 u32 reg;
33
34 clk_prepare_enable(priv->clk);
35
36 /* Enable PLL and IVREF */
37 reg = readl(priv->base + SATA_PHY_MODE_2);
38 reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
39 MODE_2_PU_PLL | MODE_2_PU_IVREF);
40 writel(reg , priv->base + SATA_PHY_MODE_2);
41
42 /* Enable PHY */
43 reg = readl(priv->base + SATA_IF_CTRL);
44 reg &= ~CTRL_PHY_SHUTDOWN;
45 writel(reg, priv->base + SATA_IF_CTRL);
46
47 clk_disable_unprepare(priv->clk);
48
49 return 0;
50 }
51
phy_mvebu_sata_power_off(struct phy * phy)52 static int phy_mvebu_sata_power_off(struct phy *phy)
53 {
54 struct priv *priv = phy_get_drvdata(phy);
55 u32 reg;
56
57 clk_prepare_enable(priv->clk);
58
59 /* Disable PLL and IVREF */
60 reg = readl(priv->base + SATA_PHY_MODE_2);
61 reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
62 MODE_2_PU_PLL | MODE_2_PU_IVREF);
63 writel(reg, priv->base + SATA_PHY_MODE_2);
64
65 /* Disable PHY */
66 reg = readl(priv->base + SATA_IF_CTRL);
67 reg |= CTRL_PHY_SHUTDOWN;
68 writel(reg, priv->base + SATA_IF_CTRL);
69
70 clk_disable_unprepare(priv->clk);
71
72 return 0;
73 }
74
75 static const struct phy_ops phy_mvebu_sata_ops = {
76 .power_on = phy_mvebu_sata_power_on,
77 .power_off = phy_mvebu_sata_power_off,
78 .owner = THIS_MODULE,
79 };
80
phy_mvebu_sata_probe(struct platform_device * pdev)81 static int phy_mvebu_sata_probe(struct platform_device *pdev)
82 {
83 struct phy_provider *phy_provider;
84 struct priv *priv;
85 struct phy *phy;
86
87 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
88 if (!priv)
89 return -ENOMEM;
90
91 priv->base = devm_platform_ioremap_resource(pdev, 0);
92 if (IS_ERR(priv->base))
93 return PTR_ERR(priv->base);
94
95 priv->clk = devm_clk_get(&pdev->dev, "sata");
96 if (IS_ERR(priv->clk))
97 return PTR_ERR(priv->clk);
98
99 phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
100 if (IS_ERR(phy))
101 return PTR_ERR(phy);
102
103 phy_set_drvdata(phy, priv);
104
105 phy_provider = devm_of_phy_provider_register(&pdev->dev,
106 of_phy_simple_xlate);
107 if (IS_ERR(phy_provider))
108 return PTR_ERR(phy_provider);
109
110 /* The boot loader may of left it on. Turn it off. */
111 phy_mvebu_sata_power_off(phy);
112
113 return 0;
114 }
115
116 static const struct of_device_id phy_mvebu_sata_of_match[] = {
117 { .compatible = "marvell,mvebu-sata-phy" },
118 { },
119 };
120
121 static struct platform_driver phy_mvebu_sata_driver = {
122 .probe = phy_mvebu_sata_probe,
123 .driver = {
124 .name = "phy-mvebu-sata",
125 .of_match_table = phy_mvebu_sata_of_match,
126 }
127 };
128 builtin_platform_driver(phy_mvebu_sata_driver);
129