1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2018 John Crispin <john@phrozen.org>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Based on code from
6*4882a593Smuzhiyun * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/delay.h>
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/io.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/mutex.h>
16*4882a593Smuzhiyun #include <linux/of_platform.h>
17*4882a593Smuzhiyun #include <linux/of_device.h>
18*4882a593Smuzhiyun #include <linux/phy/phy.h>
19*4882a593Smuzhiyun #include <linux/platform_device.h>
20*4882a593Smuzhiyun #include <linux/reset.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun struct ipq4019_usb_phy {
23*4882a593Smuzhiyun struct device *dev;
24*4882a593Smuzhiyun struct phy *phy;
25*4882a593Smuzhiyun void __iomem *base;
26*4882a593Smuzhiyun struct reset_control *por_rst;
27*4882a593Smuzhiyun struct reset_control *srif_rst;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
ipq4019_ss_phy_power_off(struct phy * _phy)30*4882a593Smuzhiyun static int ipq4019_ss_phy_power_off(struct phy *_phy)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun reset_control_assert(phy->por_rst);
35*4882a593Smuzhiyun msleep(10);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun return 0;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
ipq4019_ss_phy_power_on(struct phy * _phy)40*4882a593Smuzhiyun static int ipq4019_ss_phy_power_on(struct phy *_phy)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun ipq4019_ss_phy_power_off(_phy);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun reset_control_deassert(phy->por_rst);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return 0;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun static const struct phy_ops ipq4019_usb_ss_phy_ops = {
52*4882a593Smuzhiyun .power_on = ipq4019_ss_phy_power_on,
53*4882a593Smuzhiyun .power_off = ipq4019_ss_phy_power_off,
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
ipq4019_hs_phy_power_off(struct phy * _phy)56*4882a593Smuzhiyun static int ipq4019_hs_phy_power_off(struct phy *_phy)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun reset_control_assert(phy->por_rst);
61*4882a593Smuzhiyun msleep(10);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun reset_control_assert(phy->srif_rst);
64*4882a593Smuzhiyun msleep(10);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun return 0;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
ipq4019_hs_phy_power_on(struct phy * _phy)69*4882a593Smuzhiyun static int ipq4019_hs_phy_power_on(struct phy *_phy)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun ipq4019_hs_phy_power_off(_phy);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun reset_control_deassert(phy->srif_rst);
76*4882a593Smuzhiyun msleep(10);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun reset_control_deassert(phy->por_rst);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun return 0;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun static const struct phy_ops ipq4019_usb_hs_phy_ops = {
84*4882a593Smuzhiyun .power_on = ipq4019_hs_phy_power_on,
85*4882a593Smuzhiyun .power_off = ipq4019_hs_phy_power_off,
86*4882a593Smuzhiyun };
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun static const struct of_device_id ipq4019_usb_phy_of_match[] = {
89*4882a593Smuzhiyun { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops},
90*4882a593Smuzhiyun { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops},
91*4882a593Smuzhiyun { },
92*4882a593Smuzhiyun };
93*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match);
94*4882a593Smuzhiyun
ipq4019_usb_phy_probe(struct platform_device * pdev)95*4882a593Smuzhiyun static int ipq4019_usb_phy_probe(struct platform_device *pdev)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun struct device *dev = &pdev->dev;
98*4882a593Smuzhiyun struct resource *res;
99*4882a593Smuzhiyun struct phy_provider *phy_provider;
100*4882a593Smuzhiyun struct ipq4019_usb_phy *phy;
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
103*4882a593Smuzhiyun if (!phy)
104*4882a593Smuzhiyun return -ENOMEM;
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun phy->dev = &pdev->dev;
107*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
108*4882a593Smuzhiyun phy->base = devm_ioremap_resource(&pdev->dev, res);
109*4882a593Smuzhiyun if (IS_ERR(phy->base)) {
110*4882a593Smuzhiyun dev_err(dev, "failed to remap register memory\n");
111*4882a593Smuzhiyun return PTR_ERR(phy->base);
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
115*4882a593Smuzhiyun if (IS_ERR(phy->por_rst)) {
116*4882a593Smuzhiyun if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER)
117*4882a593Smuzhiyun dev_err(dev, "POR reset is missing\n");
118*4882a593Smuzhiyun return PTR_ERR(phy->por_rst);
119*4882a593Smuzhiyun }
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst");
122*4882a593Smuzhiyun if (IS_ERR(phy->srif_rst))
123*4882a593Smuzhiyun return PTR_ERR(phy->srif_rst);
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev));
126*4882a593Smuzhiyun if (IS_ERR(phy->phy)) {
127*4882a593Smuzhiyun dev_err(dev, "failed to create PHY\n");
128*4882a593Smuzhiyun return PTR_ERR(phy->phy);
129*4882a593Smuzhiyun }
130*4882a593Smuzhiyun phy_set_drvdata(phy->phy, phy);
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun return PTR_ERR_OR_ZERO(phy_provider);
135*4882a593Smuzhiyun }
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun static struct platform_driver ipq4019_usb_phy_driver = {
138*4882a593Smuzhiyun .probe = ipq4019_usb_phy_probe,
139*4882a593Smuzhiyun .driver = {
140*4882a593Smuzhiyun .of_match_table = ipq4019_usb_phy_of_match,
141*4882a593Smuzhiyun .name = "ipq4019-usb-phy",
142*4882a593Smuzhiyun }
143*4882a593Smuzhiyun };
144*4882a593Smuzhiyun module_platform_driver(ipq4019_usb_phy_driver);
145*4882a593Smuzhiyun
146*4882a593Smuzhiyun MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver");
147*4882a593Smuzhiyun MODULE_AUTHOR("John Crispin <john@phrozen.org>");
148*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
149