1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2018 John Crispin <john@phrozen.org>
4 *
5 * Based on code from
6 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
7 *
8 */
9
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/mutex.h>
16 #include <linux/of.h>
17 #include <linux/phy/phy.h>
18 #include <linux/platform_device.h>
19 #include <linux/reset.h>
20
21 struct ipq4019_usb_phy {
22 struct device *dev;
23 struct phy *phy;
24 void __iomem *base;
25 struct reset_control *por_rst;
26 struct reset_control *srif_rst;
27 };
28
ipq4019_ss_phy_power_off(struct phy * _phy)29 static int ipq4019_ss_phy_power_off(struct phy *_phy)
30 {
31 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
32
33 reset_control_assert(phy->por_rst);
34 msleep(10);
35
36 return 0;
37 }
38
ipq4019_ss_phy_power_on(struct phy * _phy)39 static int ipq4019_ss_phy_power_on(struct phy *_phy)
40 {
41 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
42
43 ipq4019_ss_phy_power_off(_phy);
44
45 reset_control_deassert(phy->por_rst);
46
47 return 0;
48 }
49
50 static const struct phy_ops ipq4019_usb_ss_phy_ops = {
51 .power_on = ipq4019_ss_phy_power_on,
52 .power_off = ipq4019_ss_phy_power_off,
53 };
54
ipq4019_hs_phy_power_off(struct phy * _phy)55 static int ipq4019_hs_phy_power_off(struct phy *_phy)
56 {
57 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
58
59 reset_control_assert(phy->por_rst);
60 msleep(10);
61
62 reset_control_assert(phy->srif_rst);
63 msleep(10);
64
65 return 0;
66 }
67
ipq4019_hs_phy_power_on(struct phy * _phy)68 static int ipq4019_hs_phy_power_on(struct phy *_phy)
69 {
70 struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
71
72 ipq4019_hs_phy_power_off(_phy);
73
74 reset_control_deassert(phy->srif_rst);
75 msleep(10);
76
77 reset_control_deassert(phy->por_rst);
78
79 return 0;
80 }
81
82 static const struct phy_ops ipq4019_usb_hs_phy_ops = {
83 .power_on = ipq4019_hs_phy_power_on,
84 .power_off = ipq4019_hs_phy_power_off,
85 };
86
87 static const struct of_device_id ipq4019_usb_phy_of_match[] = {
88 { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
89 { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
90 { },
91 };
92 MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
93
ipq4019_usb_phy_probe(struct platform_device * pdev)94 static int ipq4019_usb_phy_probe(struct platform_device *pdev)
95 {
96 struct device *dev = &pdev->dev;
97 struct phy_provider *phy_provider;
98 struct ipq4019_usb_phy *phy;
99
100 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
101 if (!phy)
102 return -ENOMEM;
103
104 phy->dev = &pdev->dev;
105 phy->base = devm_platform_ioremap_resource(pdev, 0);
106 if (IS_ERR(phy->base)) {
107 dev_err(dev, "failed to remap register memory\n");
108 return PTR_ERR(phy->base);
109 }
110
111 phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
112 if (IS_ERR(phy->por_rst)) {
113 if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
114 dev_err(dev, "POR reset is missing\n");
115 return PTR_ERR(phy->por_rst);
116 }
117
118 phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
119 if (IS_ERR(phy->srif_rst))
120 return PTR_ERR(phy->srif_rst);
121
122 phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
123 if (IS_ERR(phy->phy)) {
124 dev_err(dev, "failed to create PHY\n");
125 return PTR_ERR(phy->phy);
126 }
127 phy_set_drvdata(phy->phy, phy);
128
129 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
130
131 return PTR_ERR_OR_ZERO(phy_provider);
132 }
133
134 static struct platform_driver ipq4019_usb_phy_driver = {
135 .probe = ipq4019_usb_phy_probe,
136 .driver = {
137 .of_match_table = ipq4019_usb_phy_of_match,
138 .name = "ipq4019-usb-phy",
139 }
140 };
141 module_platform_driver(ipq4019_usb_phy_driver);
142
143 MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
144 MODULE_AUTHOR("John Crispin <john@phrozen.org>");
145 MODULE_LICENSE("GPL v2");
146
