tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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(phy->dev);
26
27 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
28 return 0;
29}
30
31static void am335x_shutdown(struct usb_phy *phy)
32{
33 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
34
35 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, 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, 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(pdev->dev.of_node, "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(pdev->dev.of_node, -1);
59
60 ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
61 if (ret)
62 return ret;
63
64 ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
65 if (ret)
66 return ret;
67 am_phy->usb_phy_gen.phy.init = am335x_init;
68 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
69
70 platform_set_drvdata(pdev, am_phy);
71 device_init_wakeup(dev, true);
72
73 /*
74 * If we leave PHY wakeup enabled then AM33XX wakes up
75 * immediately from DS0. To avoid this we mark dev->power.can_wakeup
76 * to false. The same is checked in suspend routine to decide
77 * on whether to enable PHY wakeup or not.
78 * PHY wakeup works fine in standby mode, there by allowing us to
79 * handle remote wakeup, wakeup on disconnect and connect.
80 */
81
82 device_set_wakeup_enable(dev, false);
83 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
84
85 return 0;
86}
87
88static int am335x_phy_remove(struct platform_device *pdev)
89{
90 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
91
92 usb_remove_phy(&am_phy->usb_phy_gen.phy);
93 return 0;
94}
95
96#ifdef CONFIG_PM_SLEEP
97static int am335x_phy_suspend(struct device *dev)
98{
99 struct platform_device *pdev = to_platform_device(dev);
100 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
101
102 /*
103 * Enable phy wakeup only if dev->power.can_wakeup is true.
104 * Make sure to enable wakeup to support remote wakeup in
105 * standby mode ( same is not supported in OFF(DS0) mode).
106 * Enable it by doing
107 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
108 */
109
110 if (device_may_wakeup(dev))
111 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
112
113 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
114
115 return 0;
116}
117
118static int am335x_phy_resume(struct device *dev)
119{
120 struct platform_device *pdev = to_platform_device(dev);
121 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
122
123 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
124
125 if (device_may_wakeup(dev))
126 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
127
128 return 0;
129}
130#endif
131
132static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
133
134static const struct of_device_id am335x_phy_ids[] = {
135 { .compatible = "ti,am335x-usb-phy" },
136 { }
137};
138MODULE_DEVICE_TABLE(of, am335x_phy_ids);
139
140static struct platform_driver am335x_phy_driver = {
141 .probe = am335x_phy_probe,
142 .remove = am335x_phy_remove,
143 .driver = {
144 .name = "am335x-phy-driver",
145 .pm = &am335x_pm_ops,
146 .of_match_table = am335x_phy_ids,
147 },
148};
149
150module_platform_driver(am335x_phy_driver);
151MODULE_LICENSE("GPL v2");