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14#include <linux/platform_device.h>
15#include <linux/io.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/of_platform.h>
20#include <linux/clk.h>
21#include <linux/phy/phy.h>
22#include <linux/regmap.h>
23#include <linux/mfd/syscon.h>
24
25#define SYSCFG332 0x80
26#define SYSCFG2520 0x820
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35
36struct stih41x_usb_cfg {
37 u32 syscfg;
38 u32 cfg_mask;
39 u32 cfg;
40 u32 oscok;
41};
42
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48
49
50struct stih41x_usb_phy {
51 struct device *dev;
52 struct regmap *regmap;
53 const struct stih41x_usb_cfg *cfg;
54 struct clk *clk;
55};
56
57static struct stih41x_usb_cfg stih415_usb_phy_cfg = {
58 .syscfg = SYSCFG332,
59 .cfg_mask = 0x3f,
60 .cfg = 0x38,
61 .oscok = BIT(6),
62};
63
64static struct stih41x_usb_cfg stih416_usb_phy_cfg = {
65 .syscfg = SYSCFG2520,
66 .cfg_mask = 0x33f,
67 .cfg = 0x238,
68 .oscok = BIT(6),
69};
70
71static int stih41x_usb_phy_init(struct phy *phy)
72{
73 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
74
75 return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
76 phy_dev->cfg->cfg_mask, phy_dev->cfg->cfg);
77}
78
79static int stih41x_usb_phy_power_on(struct phy *phy)
80{
81 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
82 int ret;
83
84 ret = clk_prepare_enable(phy_dev->clk);
85 if (ret) {
86 dev_err(phy_dev->dev, "Failed to enable osc_phy clock\n");
87 return ret;
88 }
89
90 ret = regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
91 phy_dev->cfg->oscok, phy_dev->cfg->oscok);
92 if (ret)
93 clk_disable_unprepare(phy_dev->clk);
94
95 return ret;
96}
97
98static int stih41x_usb_phy_power_off(struct phy *phy)
99{
100 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
101 int ret;
102
103 ret = regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
104 phy_dev->cfg->oscok, 0);
105 if (ret) {
106 dev_err(phy_dev->dev, "Failed to clear oscok bit\n");
107 return ret;
108 }
109
110 clk_disable_unprepare(phy_dev->clk);
111
112 return 0;
113}
114
115static const struct phy_ops stih41x_usb_phy_ops = {
116 .init = stih41x_usb_phy_init,
117 .power_on = stih41x_usb_phy_power_on,
118 .power_off = stih41x_usb_phy_power_off,
119 .owner = THIS_MODULE,
120};
121
122static const struct of_device_id stih41x_usb_phy_of_match[];
123
124static int stih41x_usb_phy_probe(struct platform_device *pdev)
125{
126 struct device_node *np = pdev->dev.of_node;
127 const struct of_device_id *match;
128 struct stih41x_usb_phy *phy_dev;
129 struct device *dev = &pdev->dev;
130 struct phy_provider *phy_provider;
131 struct phy *phy;
132
133 phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
134 if (!phy_dev)
135 return -ENOMEM;
136
137 match = of_match_device(stih41x_usb_phy_of_match, &pdev->dev);
138 if (!match)
139 return -ENODEV;
140
141 phy_dev->cfg = match->data;
142
143 phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
144 if (IS_ERR(phy_dev->regmap)) {
145 dev_err(dev, "No syscfg phandle specified\n");
146 return PTR_ERR(phy_dev->regmap);
147 }
148
149 phy_dev->clk = devm_clk_get(dev, "osc_phy");
150 if (IS_ERR(phy_dev->clk)) {
151 dev_err(dev, "osc_phy clk not found\n");
152 return PTR_ERR(phy_dev->clk);
153 }
154
155 phy = devm_phy_create(dev, NULL, &stih41x_usb_phy_ops);
156
157 if (IS_ERR(phy)) {
158 dev_err(dev, "failed to create phy\n");
159 return PTR_ERR(phy);
160 }
161
162 phy_dev->dev = dev;
163
164 phy_set_drvdata(phy, phy_dev);
165
166 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
167 return PTR_ERR_OR_ZERO(phy_provider);
168}
169
170static const struct of_device_id stih41x_usb_phy_of_match[] = {
171 { .compatible = "st,stih415-usb-phy", .data = &stih415_usb_phy_cfg },
172 { .compatible = "st,stih416-usb-phy", .data = &stih416_usb_phy_cfg },
173 { },
174};
175MODULE_DEVICE_TABLE(of, stih41x_usb_phy_of_match);
176
177static struct platform_driver stih41x_usb_phy_driver = {
178 .probe = stih41x_usb_phy_probe,
179 .driver = {
180 .name = "stih41x-usb-phy",
181 .of_match_table = stih41x_usb_phy_of_match,
182 }
183};
184module_platform_driver(stih41x_usb_phy_driver);
185
186MODULE_AUTHOR("Maxime Coquelin <maxime.coquelin@st.com>");
187MODULE_DESCRIPTION("STMicroelectronics USB PHY driver for STiH41x series");
188MODULE_LICENSE("GPL v2");
189
