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
16 struct 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
am335x_init(struct usb_phy * phy)23 static 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
am335x_shutdown(struct usb_phy * phy)31 static 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
am335x_phy_probe(struct platform_device * pdev)38 static 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);
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, am_phy);
68 device_init_wakeup(dev, 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, false);
80 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
81
82 return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
83 }
84
am335x_phy_remove(struct platform_device * pdev)85 static 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
am335x_phy_suspend(struct device * dev)93 static 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(am_phy->phy_ctrl, am_phy->id, true);
107
108 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
109
110 return 0;
111 }
112
am335x_phy_resume(struct device * dev)113 static int am335x_phy_resume(struct device *dev)
114 {
115 struct am335x_phy *am_phy = dev_get_drvdata(dev);
116
117 phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
118
119 if (device_may_wakeup(dev))
120 phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
121
122 return 0;
123 }
124 #endif
125
126 static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
127
128 static const struct of_device_id am335x_phy_ids[] = {
129 { .compatible = "ti,am335x-usb-phy" },
130 { }
131 };
132 MODULE_DEVICE_TABLE(of, am335x_phy_ids);
133
134 static 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
144 module_platform_driver(am335x_phy_driver);
145 MODULE_DESCRIPTION("AM335x USB PHY Driver");
146 MODULE_LICENSE("GPL v2");
147