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Andrew Lunne3eae852013-12-17 21:21:50 +01001/*
2 * phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
3 *
4 * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/clk.h>
15#include <linux/phy/phy.h>
16#include <linux/io.h>
17#include <linux/platform_device.h>
18
19struct priv {
20 struct clk *clk;
21 void __iomem *base;
22};
23
24#define SATA_PHY_MODE_2 0x0330
25#define MODE_2_FORCE_PU_TX BIT(0)
26#define MODE_2_FORCE_PU_RX BIT(1)
27#define MODE_2_PU_PLL BIT(2)
28#define MODE_2_PU_IVREF BIT(3)
29#define SATA_IF_CTRL 0x0050
30#define CTRL_PHY_SHUTDOWN BIT(9)
31
32static int phy_mvebu_sata_power_on(struct phy *phy)
33{
34 struct priv *priv = phy_get_drvdata(phy);
35 u32 reg;
36
37 clk_prepare_enable(priv->clk);
38
39 /* Enable PLL and IVREF */
40 reg = readl(priv->base + SATA_PHY_MODE_2);
41 reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
42 MODE_2_PU_PLL | MODE_2_PU_IVREF);
43 writel(reg , priv->base + SATA_PHY_MODE_2);
44
45 /* Enable PHY */
46 reg = readl(priv->base + SATA_IF_CTRL);
47 reg &= ~CTRL_PHY_SHUTDOWN;
48 writel(reg, priv->base + SATA_IF_CTRL);
49
50 clk_disable_unprepare(priv->clk);
51
52 return 0;
53}
54
55static int phy_mvebu_sata_power_off(struct phy *phy)
56{
57 struct priv *priv = phy_get_drvdata(phy);
58 u32 reg;
59
60 clk_prepare_enable(priv->clk);
61
62 /* Disable PLL and IVREF */
63 reg = readl(priv->base + SATA_PHY_MODE_2);
64 reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
65 MODE_2_PU_PLL | MODE_2_PU_IVREF);
66 writel(reg, priv->base + SATA_PHY_MODE_2);
67
68 /* Disable PHY */
69 reg = readl(priv->base + SATA_IF_CTRL);
70 reg |= CTRL_PHY_SHUTDOWN;
71 writel(reg, priv->base + SATA_IF_CTRL);
72
73 clk_disable_unprepare(priv->clk);
74
75 return 0;
76}
77
78static struct phy_ops phy_mvebu_sata_ops = {
79 .power_on = phy_mvebu_sata_power_on,
80 .power_off = phy_mvebu_sata_power_off,
81 .owner = THIS_MODULE,
82};
83
84static int phy_mvebu_sata_probe(struct platform_device *pdev)
85{
86 struct phy_provider *phy_provider;
87 struct resource *res;
88 struct priv *priv;
89 struct phy *phy;
90
91 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
92
93 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
94 priv->base = devm_ioremap_resource(&pdev->dev, res);
95 if (IS_ERR(priv->base))
96 return PTR_ERR(priv->base);
97
98 priv->clk = devm_clk_get(&pdev->dev, "sata");
99 if (IS_ERR(priv->clk))
100 return PTR_ERR(priv->clk);
101
102 phy_provider = devm_of_phy_provider_register(&pdev->dev,
103 of_phy_simple_xlate);
104 if (IS_ERR(phy_provider))
105 return PTR_ERR(phy_provider);
106
107 phy = devm_phy_create(&pdev->dev, &phy_mvebu_sata_ops, NULL);
108 if (IS_ERR(phy))
109 return PTR_ERR(phy);
110
111 phy_set_drvdata(phy, priv);
112
113 /* The boot loader may of left it on. Turn it off. */
114 phy_mvebu_sata_power_off(phy);
115
116 return 0;
117}
118
119static const struct of_device_id phy_mvebu_sata_of_match[] = {
120 { .compatible = "marvell,mvebu-sata-phy" },
121 { },
122};
123MODULE_DEVICE_TABLE(of, phy_mvebu_sata_of_match);
124
125static struct platform_driver phy_mvebu_sata_driver = {
126 .probe = phy_mvebu_sata_probe,
127 .driver = {
128 .name = "phy-mvebu-sata",
129 .owner = THIS_MODULE,
130 .of_match_table = phy_mvebu_sata_of_match,
131 }
132};
133module_platform_driver(phy_mvebu_sata_driver);
134
135MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
136MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver");
137MODULE_LICENSE("GPL v2");