1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * StarFive JH7110 USB 2.0 PHY driver
4 *
5 * Copyright (C) 2023 StarFive Technology Co., Ltd.
6 * Author: Minda Chen <minda.chen@starfivetech.com>
7 */
8
9 #include <linux/bits.h>
10 #include <linux/clk.h>
11 #include <linux/err.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/phy/phy.h>
15 #include <linux/platform_device.h>
16 #include <linux/usb/of.h>
17
18 #define USB_125M_CLK_RATE 125000000
19 #define USB_LS_KEEPALIVE_OFF 0x4
20 #define USB_LS_KEEPALIVE_ENABLE BIT(4)
21
22 struct jh7110_usb2_phy {
23 struct phy *phy;
24 void __iomem *regs;
25 struct clk *usb_125m_clk;
26 struct clk *app_125m;
27 enum phy_mode mode;
28 };
29
usb2_set_ls_keepalive(struct jh7110_usb2_phy * phy,bool set)30 static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)
31 {
32 unsigned int val;
33
34 /* Host mode enable the LS speed keep-alive signal */
35 val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
36 if (set)
37 val |= USB_LS_KEEPALIVE_ENABLE;
38 else
39 val &= ~USB_LS_KEEPALIVE_ENABLE;
40
41 writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
42 }
43
usb2_phy_set_mode(struct phy * _phy,enum phy_mode mode,int submode)44 static int usb2_phy_set_mode(struct phy *_phy,
45 enum phy_mode mode, int submode)
46 {
47 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
48
49 switch (mode) {
50 case PHY_MODE_USB_HOST:
51 case PHY_MODE_USB_DEVICE:
52 case PHY_MODE_USB_OTG:
53 break;
54 default:
55 return -EINVAL;
56 }
57
58 if (mode != phy->mode) {
59 dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);
60 phy->mode = mode;
61 usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
62 }
63
64 return 0;
65 }
66
jh7110_usb2_phy_init(struct phy * _phy)67 static int jh7110_usb2_phy_init(struct phy *_phy)
68 {
69 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
70 int ret;
71
72 ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
73 if (ret)
74 return ret;
75
76 ret = clk_prepare_enable(phy->app_125m);
77 if (ret)
78 return ret;
79
80 return 0;
81 }
82
jh7110_usb2_phy_exit(struct phy * _phy)83 static int jh7110_usb2_phy_exit(struct phy *_phy)
84 {
85 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
86
87 clk_disable_unprepare(phy->app_125m);
88
89 return 0;
90 }
91
92 static const struct phy_ops jh7110_usb2_phy_ops = {
93 .init = jh7110_usb2_phy_init,
94 .exit = jh7110_usb2_phy_exit,
95 .set_mode = usb2_phy_set_mode,
96 .owner = THIS_MODULE,
97 };
98
jh7110_usb_phy_probe(struct platform_device * pdev)99 static int jh7110_usb_phy_probe(struct platform_device *pdev)
100 {
101 struct jh7110_usb2_phy *phy;
102 struct device *dev = &pdev->dev;
103 struct phy_provider *phy_provider;
104
105 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
106 if (!phy)
107 return -ENOMEM;
108
109 phy->usb_125m_clk = devm_clk_get(dev, "125m");
110 if (IS_ERR(phy->usb_125m_clk))
111 return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
112 "Failed to get 125m clock\n");
113
114 phy->app_125m = devm_clk_get(dev, "app_125m");
115 if (IS_ERR(phy->app_125m))
116 return dev_err_probe(dev, PTR_ERR(phy->app_125m),
117 "Failed to get app 125m clock\n");
118
119 phy->regs = devm_platform_ioremap_resource(pdev, 0);
120 if (IS_ERR(phy->regs))
121 return dev_err_probe(dev, PTR_ERR(phy->regs),
122 "Failed to map phy base\n");
123
124 phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
125 if (IS_ERR(phy->phy))
126 return dev_err_probe(dev, PTR_ERR(phy->phy),
127 "Failed to create phy\n");
128
129 phy_set_drvdata(phy->phy, phy);
130 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
131
132 return PTR_ERR_OR_ZERO(phy_provider);
133 }
134
135 static const struct of_device_id jh7110_usb_phy_of_match[] = {
136 { .compatible = "starfive,jh7110-usb-phy" },
137 { /* sentinel */ },
138 };
139 MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
140
141 static struct platform_driver jh7110_usb_phy_driver = {
142 .probe = jh7110_usb_phy_probe,
143 .driver = {
144 .of_match_table = jh7110_usb_phy_of_match,
145 .name = "jh7110-usb-phy",
146 }
147 };
148 module_platform_driver(jh7110_usb_phy_driver);
149
150 MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
151 MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
152 MODULE_LICENSE("GPL");
153