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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
22struct 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
30static 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
44static 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
67static 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
83static 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
92static 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
99static 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
135static const struct of_device_id jh7110_usb_phy_of_match[] = {
136 { .compatible = "starfive,jh7110-usb-phy" },
137 { /* sentinel */ },
138};
139MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
140
141static 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};
148module_platform_driver(jh7110_usb_phy_driver);
149
150MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
151MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
152MODULE_LICENSE("GPL");
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/mfd/syscon.h>
14#include <linux/module.h>
15#include <linux/phy/phy.h>
16#include <linux/platform_device.h>
17#include <linux/regmap.h>
18#include <linux/usb/of.h>
19
20#define USB_125M_CLK_RATE 125000000
21#define USB_LS_KEEPALIVE_OFF 0x4
22#define USB_LS_KEEPALIVE_ENABLE BIT(4)
23
24#define USB_PDRSTN_SPLIT BIT(17)
25#define SYSCON_USB_SPLIT_OFFSET 0x18
26
27struct jh7110_usb2_phy {
28 struct phy *phy;
29 void __iomem *regs;
30 struct regmap *sys_syscon;
31 struct clk *usb_125m_clk;
32 struct clk *app_125m;
33 enum phy_mode mode;
34};
35
36static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)
37{
38 unsigned int val;
39
40 /* Host mode enable the LS speed keep-alive signal */
41 val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
42 if (set)
43 val |= USB_LS_KEEPALIVE_ENABLE;
44 else
45 val &= ~USB_LS_KEEPALIVE_ENABLE;
46
47 writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
48}
49
50static int usb2_phy_set_mode(struct phy *_phy,
51 enum phy_mode mode, int submode)
52{
53 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
54
55 switch (mode) {
56 case PHY_MODE_USB_HOST:
57 case PHY_MODE_USB_DEVICE:
58 case PHY_MODE_USB_OTG:
59 break;
60 default:
61 return -EINVAL;
62 }
63
64 if (mode != phy->mode) {
65 dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);
66 phy->mode = mode;
67 usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
68 }
69
70 /* Connect usb 2.0 phy mode */
71 regmap_update_bits(phy->sys_syscon, SYSCON_USB_SPLIT_OFFSET,
72 USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT);
73
74 return 0;
75}
76
77static int jh7110_usb2_phy_init(struct phy *_phy)
78{
79 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
80 int ret;
81
82 ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
83 if (ret)
84 return ret;
85
86 ret = clk_prepare_enable(phy->app_125m);
87 if (ret)
88 return ret;
89
90 return 0;
91}
92
93static int jh7110_usb2_phy_exit(struct phy *_phy)
94{
95 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
96
97 clk_disable_unprepare(phy->app_125m);
98
99 return 0;
100}
101
102static const struct phy_ops jh7110_usb2_phy_ops = {
103 .init = jh7110_usb2_phy_init,
104 .exit = jh7110_usb2_phy_exit,
105 .set_mode = usb2_phy_set_mode,
106 .owner = THIS_MODULE,
107};
108
109static int jh7110_usb_phy_probe(struct platform_device *pdev)
110{
111 struct jh7110_usb2_phy *phy;
112 struct device *dev = &pdev->dev;
113 struct phy_provider *phy_provider;
114
115 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
116 if (!phy)
117 return -ENOMEM;
118
119 phy->usb_125m_clk = devm_clk_get(dev, "125m");
120 if (IS_ERR(phy->usb_125m_clk))
121 return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
122 "Failed to get 125m clock\n");
123
124 phy->app_125m = devm_clk_get(dev, "app_125m");
125 if (IS_ERR(phy->app_125m))
126 return dev_err_probe(dev, PTR_ERR(phy->app_125m),
127 "Failed to get app 125m clock\n");
128
129 phy->regs = devm_platform_ioremap_resource(pdev, 0);
130 if (IS_ERR(phy->regs))
131 return dev_err_probe(dev, PTR_ERR(phy->regs),
132 "Failed to map phy base\n");
133
134 phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
135 if (IS_ERR(phy->phy))
136 return dev_err_probe(dev, PTR_ERR(phy->phy),
137 "Failed to create phy\n");
138
139 phy_set_drvdata(phy->phy, phy);
140 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
141
142 phy->sys_syscon =
143 syscon_regmap_lookup_by_compatible("starfive,jh7110-sys-syscon");
144 if (IS_ERR(phy->sys_syscon))
145 return dev_err_probe(dev, PTR_ERR(phy->sys_syscon),
146 "Failed to get sys-syscon\n");
147
148 return PTR_ERR_OR_ZERO(phy_provider);
149}
150
151static const struct of_device_id jh7110_usb_phy_of_match[] = {
152 { .compatible = "starfive,jh7110-usb-phy" },
153 { /* sentinel */ },
154};
155MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
156
157static struct platform_driver jh7110_usb_phy_driver = {
158 .probe = jh7110_usb_phy_probe,
159 .driver = {
160 .of_match_table = jh7110_usb_phy_of_match,
161 .name = "jh7110-usb-phy",
162 }
163};
164module_platform_driver(jh7110_usb_phy_driver);
165
166MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
167MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
168MODULE_LICENSE("GPL");