1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
*
* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/io.h>
#include <linux/mod_devicetable.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 priv *priv;
struct phy *phy;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_platform_ioremap_resource(pdev, 0);
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" },
{ },
};
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,
}
};
builtin_platform_driver(phy_mvebu_sata_driver);
|
