1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2015 Linaro Ltd.
4 * Copyright (c) 2015 HiSilicon Limited.
5 */
6
7#include <linux/mfd/syscon.h>
8#include <linux/mod_devicetable.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/phy/phy.h>
12#include <linux/regmap.h>
13
14#define SC_PERIPH_CTRL4 0x00c
15
16#define CTRL4_PICO_SIDDQ BIT(6)
17#define CTRL4_PICO_OGDISABLE BIT(8)
18#define CTRL4_PICO_VBUSVLDEXT BIT(10)
19#define CTRL4_PICO_VBUSVLDEXTSEL BIT(11)
20#define CTRL4_OTG_PHY_SEL BIT(21)
21
22#define SC_PERIPH_CTRL5 0x010
23
24#define CTRL5_USBOTG_RES_SEL BIT(3)
25#define CTRL5_PICOPHY_ACAENB BIT(4)
26#define CTRL5_PICOPHY_BC_MODE BIT(5)
27#define CTRL5_PICOPHY_CHRGSEL BIT(6)
28#define CTRL5_PICOPHY_VDATSRCEND BIT(7)
29#define CTRL5_PICOPHY_VDATDETENB BIT(8)
30#define CTRL5_PICOPHY_DCDENB BIT(9)
31#define CTRL5_PICOPHY_IDDIG BIT(10)
32
33#define SC_PERIPH_CTRL8 0x018
34#define SC_PERIPH_RSTEN0 0x300
35#define SC_PERIPH_RSTDIS0 0x304
36
37#define RST0_USBOTG_BUS BIT(4)
38#define RST0_POR_PICOPHY BIT(5)
39#define RST0_USBOTG BIT(6)
40#define RST0_USBOTG_32K BIT(7)
41
42#define EYE_PATTERN_PARA 0x7053348c
43
44struct hi6220_priv {
45 struct regmap *reg;
46 struct device *dev;
47};
48
49static void hi6220_phy_init(struct hi6220_priv *priv)
50{
51 struct regmap *reg = priv->reg;
52 u32 val, mask;
53
54 val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
55 RST0_USBOTG | RST0_USBOTG_32K;
56 mask = val;
57 regmap_update_bits(map: reg, SC_PERIPH_RSTEN0, mask, val);
58 regmap_update_bits(map: reg, SC_PERIPH_RSTDIS0, mask, val);
59}
60
61static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
62{
63 struct regmap *reg = priv->reg;
64 u32 val, mask;
65 int ret;
66
67 if (on) {
68 val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
69 mask = val | CTRL5_PICOPHY_BC_MODE;
70 ret = regmap_update_bits(map: reg, SC_PERIPH_CTRL5, mask, val);
71 if (ret)
72 goto out;
73
74 val = CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
75 CTRL4_OTG_PHY_SEL;
76 mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
77 ret = regmap_update_bits(map: reg, SC_PERIPH_CTRL4, mask, val);
78 if (ret)
79 goto out;
80
81 ret = regmap_write(map: reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
82 if (ret)
83 goto out;
84 } else {
85 val = CTRL4_PICO_SIDDQ;
86 mask = val;
87 ret = regmap_update_bits(map: reg, SC_PERIPH_CTRL4, mask, val);
88 if (ret)
89 goto out;
90 }
91
92 return 0;
93out:
94 dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
95 return ret;
96}
97
98static int hi6220_phy_start(struct phy *phy)
99{
100 struct hi6220_priv *priv = phy_get_drvdata(phy);
101
102 return hi6220_phy_setup(priv, on: true);
103}
104
105static int hi6220_phy_exit(struct phy *phy)
106{
107 struct hi6220_priv *priv = phy_get_drvdata(phy);
108
109 return hi6220_phy_setup(priv, on: false);
110}
111
112static const struct phy_ops hi6220_phy_ops = {
113 .init = hi6220_phy_start,
114 .exit = hi6220_phy_exit,
115 .owner = THIS_MODULE,
116};
117
118static int hi6220_phy_probe(struct platform_device *pdev)
119{
120 struct phy_provider *phy_provider;
121 struct device *dev = &pdev->dev;
122 struct phy *phy;
123 struct hi6220_priv *priv;
124
125 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
126 if (!priv)
127 return -ENOMEM;
128
129 priv->dev = dev;
130 priv->reg = syscon_regmap_lookup_by_phandle(np: dev->of_node,
131 property: "hisilicon,peripheral-syscon");
132 if (IS_ERR(ptr: priv->reg)) {
133 dev_err(dev, "no hisilicon,peripheral-syscon\n");
134 return PTR_ERR(ptr: priv->reg);
135 }
136
137 hi6220_phy_init(priv);
138
139 phy = devm_phy_create(dev, NULL, ops: &hi6220_phy_ops);
140 if (IS_ERR(ptr: phy))
141 return PTR_ERR(ptr: phy);
142
143 phy_set_drvdata(phy, data: priv);
144 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
145 return PTR_ERR_OR_ZERO(ptr: phy_provider);
146}
147
148static const struct of_device_id hi6220_phy_of_match[] = {
149 {.compatible = "hisilicon,hi6220-usb-phy",},
150 { },
151};
152MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
153
154static struct platform_driver hi6220_phy_driver = {
155 .probe = hi6220_phy_probe,
156 .driver = {
157 .name = "hi6220-usb-phy",
158 .of_match_table = hi6220_phy_of_match,
159 }
160};
161module_platform_driver(hi6220_phy_driver);
162
163MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
164MODULE_ALIAS("platform:hi6220-usb-phy");
165MODULE_LICENSE("GPL");
166

source code of linux/drivers/phy/hisilicon/phy-hi6220-usb.c