tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/module.h>
2#include <linux/platform_device.h>
3#include <linux/dma-mapping.h>
4#include <linux/usb/otg.h>
5#include <linux/usb/usb_phy_generic.h>
6#include <linux/slab.h>
7#include <linux/clk.h>
8#include <linux/of.h>
9#include <linux/of_address.h>
10#include <linux/usb/of.h>
11
12#include "phy-am335x-control.h"
13#include "phy-generic.h"
14
15struct am335x_phy {
16 struct usb_phy_generic usb_phy_gen;
17 struct phy_control *phy_ctrl;
18 int id;
19 enum usb_dr_mode dr_mode;
20};
21
22static int am335x_init(struct usb_phy *phy)
23{
24 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
25
26 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
27 return 0;
28}
29
30static void am335x_shutdown(struct usb_phy *phy)
31{
32 struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
33
34 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
35}
36
37static int am335x_phy_probe(struct platform_device *pdev)
38{
39 struct am335x_phy *am_phy;
40 struct device *dev = &pdev->dev;
41 int ret;
42
43 am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
44 if (!am_phy)
45 return -ENOMEM;
46
47 am_phy->phy_ctrl = am335x_get_phy_control(dev);
48 if (!am_phy->phy_ctrl)
49 return -EPROBE_DEFER;
50
51 am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
52 if (am_phy->id < 0) {
53 dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
54 return am_phy->id;
55 }
56
57 am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
58
59 ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
60 if (ret)
61 return ret;
62
63 ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
64 if (ret)
65 return ret;
66 am_phy->usb_phy_gen.phy.init = am335x_init;
67 am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
68
69 platform_set_drvdata(pdev, am_phy);
70 device_init_wakeup(dev, true);
71
72 /*
73 * If we leave PHY wakeup enabled then AM33XX wakes up
74 * immediately from DS0. To avoid this we mark dev->power.can_wakeup
75 * to false. The same is checked in suspend routine to decide
76 * on whether to enable PHY wakeup or not.
77 * PHY wakeup works fine in standby mode, there by allowing us to
78 * handle remote wakeup, wakeup on disconnect and connect.
79 */
80
81 device_set_wakeup_enable(dev, false);
82 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
83
84 return 0;
85}
86
87static int am335x_phy_remove(struct platform_device *pdev)
88{
89 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
90
91 usb_remove_phy(&am_phy->usb_phy_gen.phy);
92 return 0;
93}
94
95#ifdef CONFIG_PM_SLEEP
96static int am335x_phy_suspend(struct device *dev)
97{
98 struct platform_device *pdev = to_platform_device(dev);
99 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
100
101 /*
102 * Enable phy wakeup only if dev->power.can_wakeup is true.
103 * Make sure to enable wakeup to support remote wakeup in
104 * standby mode ( same is not supported in OFF(DS0) mode).
105 * Enable it by doing
106 * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
107 */
108
109 if (device_may_wakeup(dev))
110 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
111
112 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
113
114 return 0;
115}
116
117static int am335x_phy_resume(struct device *dev)
118{
119 struct platform_device *pdev = to_platform_device(dev);
120 struct am335x_phy *am_phy = platform_get_drvdata(pdev);
121
122 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
123
124 if (device_may_wakeup(dev))
125 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
126
127 return 0;
128}
129#endif
130
131static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
132
133static const struct of_device_id am335x_phy_ids[] = {
134 { .compatible = "ti,am335x-usb-phy" },
135 { }
136};
137MODULE_DEVICE_TABLE(of, am335x_phy_ids);
138
139static struct platform_driver am335x_phy_driver = {
140 .probe = am335x_phy_probe,
141 .remove = am335x_phy_remove,
142 .driver = {
143 .name = "am335x-phy-driver",
144 .pm = &am335x_pm_ops,
145 .of_match_table = am335x_phy_ids,
146 },
147};
148
149module_platform_driver(am335x_phy_driver);
150MODULE_LICENSE("GPL v2");