summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/phy/phy-rockchip-usb.c
blob: 7d4c33643768808780f71455900bc7dd51329103 (plain)
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/*
 * Rockchip usb PHY driver
 *
 * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
 * Copyright (C) 2014 ROCKCHIP, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

/*
 * The higher 16-bit of this register is used for write protection
 * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
 */
#define SIDDQ_WRITE_ENA	BIT(29)
#define SIDDQ_ON		BIT(13)
#define SIDDQ_OFF		(0 << 13)

struct rockchip_usb_phy {
	unsigned int	reg_offset;
	struct regmap	*reg_base;
	struct clk	*clk;
	struct phy	*phy;
};

static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy,
					   bool siddq)
{
	return regmap_write(phy->reg_base, phy->reg_offset,
			    SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
}

static int rockchip_usb_phy_power_off(struct phy *_phy)
{
	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
	int ret = 0;

	/* Power down usb phy analog blocks by set siddq 1 */
	ret = rockchip_usb_phy_power(phy, 1);
	if (ret)
		return ret;

	clk_disable_unprepare(phy->clk);

	return 0;
}

static int rockchip_usb_phy_power_on(struct phy *_phy)
{
	struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
	int ret = 0;

	ret = clk_prepare_enable(phy->clk);
	if (ret)
		return ret;

	/* Power up usb phy analog blocks by set siddq 0 */
	ret = rockchip_usb_phy_power(phy, 0);
	if (ret) {
		clk_disable_unprepare(phy->clk);
		return ret;
	}

	return 0;
}

static struct phy_ops ops = {
	.power_on	= rockchip_usb_phy_power_on,
	.power_off	= rockchip_usb_phy_power_off,
	.owner		= THIS_MODULE,
};

static int rockchip_usb_phy_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rockchip_usb_phy *rk_phy;
	struct phy_provider *phy_provider;
	struct device_node *child;
	struct regmap *grf;
	unsigned int reg_offset;

	grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
	if (IS_ERR(grf)) {
		dev_err(&pdev->dev, "Missing rockchip,grf property\n");
		return PTR_ERR(grf);
	}

	for_each_available_child_of_node(dev->of_node, child) {
		rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
		if (!rk_phy)
			return -ENOMEM;

		if (of_property_read_u32(child, "reg", &reg_offset)) {
			dev_err(dev, "missing reg property in node %s\n",
				child->name);
			return -EINVAL;
		}

		rk_phy->reg_offset = reg_offset;
		rk_phy->reg_base = grf;

		rk_phy->clk = of_clk_get_by_name(child, "phyclk");
		if (IS_ERR(rk_phy->clk))
			rk_phy->clk = NULL;

		rk_phy->phy = devm_phy_create(dev, child, &ops);
		if (IS_ERR(rk_phy->phy)) {
			dev_err(dev, "failed to create PHY\n");
			return PTR_ERR(rk_phy->phy);
		}
		phy_set_drvdata(rk_phy->phy, rk_phy);
	}

	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	return PTR_ERR_OR_ZERO(phy_provider);
}

static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
	{ .compatible = "rockchip,rk3288-usb-phy" },
	{}
};

MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);

static struct platform_driver rockchip_usb_driver = {
	.probe		= rockchip_usb_phy_probe,
	.driver		= {
		.name	= "rockchip-usb-phy",
		.owner	= THIS_MODULE,
		.of_match_table = rockchip_usb_phy_dt_ids,
	},
};

module_platform_driver(rockchip_usb_driver);

MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
MODULE_LICENSE("GPL v2");