summaryrefslogtreecommitdiffstats
path: root/drivers/phy/hisilicon/phy-hi6220-usb.c
blob: be05292df8b817925709ed38dbc587e770046af4 (plain) (blame)
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
159
160
161
162
163
164
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2015 Linaro Ltd.
 * Copyright (c) 2015 Hisilicon Limited.
 */

#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>

#define SC_PERIPH_CTRL4			0x00c

#define CTRL4_PICO_SIDDQ		BIT(6)
#define CTRL4_PICO_OGDISABLE		BIT(8)
#define CTRL4_PICO_VBUSVLDEXT		BIT(10)
#define CTRL4_PICO_VBUSVLDEXTSEL	BIT(11)
#define CTRL4_OTG_PHY_SEL		BIT(21)

#define SC_PERIPH_CTRL5			0x010

#define CTRL5_USBOTG_RES_SEL		BIT(3)
#define CTRL5_PICOPHY_ACAENB		BIT(4)
#define CTRL5_PICOPHY_BC_MODE		BIT(5)
#define CTRL5_PICOPHY_CHRGSEL		BIT(6)
#define CTRL5_PICOPHY_VDATSRCEND	BIT(7)
#define CTRL5_PICOPHY_VDATDETENB	BIT(8)
#define CTRL5_PICOPHY_DCDENB		BIT(9)
#define CTRL5_PICOPHY_IDDIG		BIT(10)

#define SC_PERIPH_CTRL8			0x018
#define SC_PERIPH_RSTEN0		0x300
#define SC_PERIPH_RSTDIS0		0x304

#define RST0_USBOTG_BUS			BIT(4)
#define RST0_POR_PICOPHY		BIT(5)
#define RST0_USBOTG			BIT(6)
#define RST0_USBOTG_32K			BIT(7)

#define EYE_PATTERN_PARA		0x7053348c

struct hi6220_priv {
	struct regmap *reg;
	struct device *dev;
};

static void hi6220_phy_init(struct hi6220_priv *priv)
{
	struct regmap *reg = priv->reg;
	u32 val, mask;

	val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
	      RST0_USBOTG | RST0_USBOTG_32K;
	mask = val;
	regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
	regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
}

static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
{
	struct regmap *reg = priv->reg;
	u32 val, mask;
	int ret;

	if (on) {
		val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
		mask = val | CTRL5_PICOPHY_BC_MODE;
		ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
		if (ret)
			goto out;

		val =  CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
		       CTRL4_OTG_PHY_SEL;
		mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
		ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
		if (ret)
			goto out;

		ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
		if (ret)
			goto out;
	} else {
		val = CTRL4_PICO_SIDDQ;
		mask = val;
		ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
		if (ret)
			goto out;
	}

	return 0;
out:
	dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
	return ret;
}

static int hi6220_phy_start(struct phy *phy)
{
	struct hi6220_priv *priv = phy_get_drvdata(phy);

	return hi6220_phy_setup(priv, true);
}

static int hi6220_phy_exit(struct phy *phy)
{
	struct hi6220_priv *priv = phy_get_drvdata(phy);

	return hi6220_phy_setup(priv, false);
}

static const struct phy_ops hi6220_phy_ops = {
	.init		= hi6220_phy_start,
	.exit		= hi6220_phy_exit,
	.owner		= THIS_MODULE,
};

static int hi6220_phy_probe(struct platform_device *pdev)
{
	struct phy_provider *phy_provider;
	struct device *dev = &pdev->dev;
	struct phy *phy;
	struct hi6220_priv *priv;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->dev = dev;
	priv->reg = syscon_regmap_lookup_by_phandle(dev->of_node,
					"hisilicon,peripheral-syscon");
	if (IS_ERR(priv->reg)) {
		dev_err(dev, "no hisilicon,peripheral-syscon\n");
		return PTR_ERR(priv->reg);
	}

	hi6220_phy_init(priv);

	phy = devm_phy_create(dev, NULL, &hi6220_phy_ops);
	if (IS_ERR(phy))
		return PTR_ERR(phy);

	phy_set_drvdata(phy, priv);
	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 hi6220_phy_of_match[] = {
	{.compatible = "hisilicon,hi6220-usb-phy",},
	{ },
};
MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);

static struct platform_driver hi6220_phy_driver = {
	.probe	= hi6220_phy_probe,
	.driver = {
		.name	= "hi6220-usb-phy",
		.of_match_table	= hi6220_phy_of_match,
	}
};
module_platform_driver(hi6220_phy_driver);

MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
MODULE_ALIAS("platform:hi6220-usb-phy");
MODULE_LICENSE("GPL");