1// SPDX-License-Identifier: GPL-2.0
2#include <linux/module.h>
3#include <linux/platform_device.h>
4#include <linux/dma-mapping.h>
5#include <linux/usb/otg.h>
6#include <linux/usb/usb_phy_generic.h>
7#include <linux/slab.h>
8#include <linux/clk.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11#include <linux/usb/of.h>
12
13#include "phy-am335x-control.h"
14#include "phy-generic.h"
15
16struct am335x_phy {
17 struct usb_phy_generic usb_phy_gen;
18 struct phy_control *phy_ctrl;
19 int id;
20 enum usb_dr_mode dr_mode;
21};
22
23static int am335x_init(struct usb_phy *phy)
24{
25 struct am335x_phy *am_phy = dev_get_drvdata(dev: phy->dev);
26
27 phy_ctrl_power(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, dr_mode: am_phy->dr_mode, on: true);
28 return 0;
29}
30
31static void am335x_shutdown(struct usb_phy *phy)
32{
33 struct am335x_phy *am_phy = dev_get_drvdata(dev: phy->dev);
34
35 phy_ctrl_power(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, dr_mode: am_phy->dr_mode, on: false);
36}
37
38static int am335x_phy_probe(struct platform_device *pdev)
39{
40 struct am335x_phy *am_phy;
41 struct device *dev = &pdev->dev;
42 int ret;
43
44 am_phy = devm_kzalloc(dev, size: sizeof(*am_phy), GFP_KERNEL);
45 if (!am_phy)
46 return -ENOMEM;
47
48 am_phy->phy_ctrl = am335x_get_phy_control(dev);
49 if (!am_phy->phy_ctrl)
50 return -EPROBE_DEFER;
51
52 am_phy->id = of_alias_get_id(np: pdev->dev.of_node, stem: "phy");
53 if (am_phy->id < 0) {
54 dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
55 return am_phy->id;
56 }
57
58 am_phy->dr_mode = of_usb_get_dr_mode_by_phy(np: pdev->dev.of_node, arg0: -1);
59
60 ret = usb_phy_gen_create_phy(dev, nop: &am_phy->usb_phy_gen);
61 if (ret)
62 return ret;
63
64 am_phy->usb_phy_gen.phy.init = am335x_init;
65 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
66
67 platform_set_drvdata(pdev, data: am_phy);
68 device_init_wakeup(dev, enable: true);
69
70 /*
71 * If we leave PHY wakeup enabled then AM33XX wakes up
72 * immediately from DS0. To avoid this we mark dev->power.can_wakeup
73 * to false. The same is checked in suspend routine to decide
74 * on whether to enable PHY wakeup or not.
75 * PHY wakeup works fine in standby mode, there by allowing us to
76 * handle remote wakeup, wakeup on disconnect and connect.
77 */
78
79 device_set_wakeup_enable(dev, enable: false);
80 phy_ctrl_power(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, dr_mode: am_phy->dr_mode, on: false);
81
82 return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
83}
84
85static void am335x_phy_remove(struct platform_device *pdev)
86{
87 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
88
89 usb_remove_phy(&am_phy->usb_phy_gen.phy);
90}
91
92#ifdef CONFIG_PM_SLEEP
93static int am335x_phy_suspend(struct device *dev)
94{
95 struct am335x_phy *am_phy = dev_get_drvdata(dev);
96
97 /*
98 * Enable phy wakeup only if dev->power.can_wakeup is true.
99 * Make sure to enable wakeup to support remote wakeup in
100 * standby mode ( same is not supported in OFF(DS0) mode).
101 * Enable it by doing
102 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
103 */
104
105 if (device_may_wakeup(dev))
106 phy_ctrl_wkup(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, on: true);
107
108 phy_ctrl_power(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, dr_mode: am_phy->dr_mode, on: false);
109
110 return 0;
111}
112
113static int am335x_phy_resume(struct device *dev)
114{
115 struct am335x_phy *am_phy = dev_get_drvdata(dev);
116
117 phy_ctrl_power(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, dr_mode: am_phy->dr_mode, on: true);
118
119 if (device_may_wakeup(dev))
120 phy_ctrl_wkup(phy_ctrl: am_phy->phy_ctrl, id: am_phy->id, on: false);
121
122 return 0;
123}
124#endif
125
126static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
127
128static const struct of_device_id am335x_phy_ids[] = {
129 { .compatible = "ti,am335x-usb-phy" },
130 { }
131};
132MODULE_DEVICE_TABLE(of, am335x_phy_ids);
133
134static struct platform_driver am335x_phy_driver = {
135 .probe = am335x_phy_probe,
136 .remove_new = am335x_phy_remove,
137 .driver = {
138 .name = "am335x-phy-driver",
139 .pm = &am335x_pm_ops,
140 .of_match_table = am335x_phy_ids,
141 },
142};
143
144module_platform_driver(am335x_phy_driver);
145MODULE_LICENSE("GPL v2");
146

source code of linux/drivers/usb/phy/phy-am335x.c