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3bb869c8 SAS |
1 | #include <linux/module.h> |
2 | #include <linux/platform_device.h> | |
3 | #include <linux/dma-mapping.h> | |
4 | #include <linux/usb/otg.h> | |
d7078df6 | 5 | #include <linux/usb/usb_phy_generic.h> |
3bb869c8 SAS |
6 | #include <linux/slab.h> |
7 | #include <linux/clk.h> | |
8 | #include <linux/regulator/consumer.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/of_address.h> | |
11 | ||
12 | #include "am35x-phy-control.h" | |
13 | #include "phy-generic.h" | |
14 | ||
15 | struct am335x_phy { | |
4525beeb | 16 | struct usb_phy_generic usb_phy_gen; |
3bb869c8 SAS |
17 | struct phy_control *phy_ctrl; |
18 | int id; | |
19 | }; | |
20 | ||
21 | static int am335x_init(struct usb_phy *phy) | |
22 | { | |
23 | struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); | |
24 | ||
25 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true); | |
26 | return 0; | |
27 | } | |
28 | ||
29 | static void am335x_shutdown(struct usb_phy *phy) | |
30 | { | |
31 | struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); | |
32 | ||
33 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); | |
34 | } | |
35 | ||
36 | static int am335x_phy_probe(struct platform_device *pdev) | |
37 | { | |
38 | struct am335x_phy *am_phy; | |
39 | struct device *dev = &pdev->dev; | |
40 | int ret; | |
41 | ||
42 | am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL); | |
43 | if (!am_phy) | |
44 | return -ENOMEM; | |
45 | ||
46 | am_phy->phy_ctrl = am335x_get_phy_control(dev); | |
47 | if (!am_phy->phy_ctrl) | |
48 | return -EPROBE_DEFER; | |
49 | am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy"); | |
50 | if (am_phy->id < 0) { | |
51 | dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id); | |
52 | return am_phy->id; | |
53 | } | |
54 | ||
af9f51c5 | 55 | ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL); |
3bb869c8 SAS |
56 | if (ret) |
57 | return ret; | |
58 | ||
59 | ret = usb_add_phy_dev(&am_phy->usb_phy_gen.phy); | |
60 | if (ret) | |
4d175f34 | 61 | return ret; |
3bb869c8 SAS |
62 | am_phy->usb_phy_gen.phy.init = am335x_init; |
63 | am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown; | |
64 | ||
65 | platform_set_drvdata(pdev, am_phy); | |
2fc711d7 GC |
66 | device_init_wakeup(dev, true); |
67 | ||
68 | /* | |
69 | * If we leave PHY wakeup enabled then AM33XX wakes up | |
70 | * immediately from DS0. To avoid this we mark dev->power.can_wakeup | |
71 | * to false. The same is checked in suspend routine to decide | |
72 | * on whether to enable PHY wakeup or not. | |
73 | * PHY wakeup works fine in standby mode, there by allowing us to | |
74 | * handle remote wakeup, wakeup on disconnect and connect. | |
75 | */ | |
76 | ||
77 | device_set_wakeup_enable(dev, false); | |
78 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); | |
4d175f34 | 79 | |
3bb869c8 | 80 | return 0; |
3bb869c8 SAS |
81 | } |
82 | ||
83 | static int am335x_phy_remove(struct platform_device *pdev) | |
84 | { | |
85 | struct am335x_phy *am_phy = platform_get_drvdata(pdev); | |
86 | ||
87 | usb_remove_phy(&am_phy->usb_phy_gen.phy); | |
88 | return 0; | |
89 | } | |
90 | ||
2fc711d7 GC |
91 | #ifdef CONFIG_PM_SLEEP |
92 | static int am335x_phy_suspend(struct device *dev) | |
a1222639 SAS |
93 | { |
94 | struct platform_device *pdev = to_platform_device(dev); | |
95 | struct am335x_phy *am_phy = platform_get_drvdata(pdev); | |
96 | ||
2fc711d7 GC |
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 | ||
a1222639 SAS |
105 | if (device_may_wakeup(dev)) |
106 | phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); | |
2fc711d7 | 107 | |
a1222639 | 108 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, false); |
2fc711d7 | 109 | |
a1222639 SAS |
110 | return 0; |
111 | } | |
112 | ||
2fc711d7 | 113 | static int am335x_phy_resume(struct device *dev) |
a1222639 SAS |
114 | { |
115 | struct platform_device *pdev = to_platform_device(dev); | |
116 | struct am335x_phy *am_phy = platform_get_drvdata(pdev); | |
117 | ||
118 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, true); | |
2fc711d7 | 119 | |
a1222639 SAS |
120 | if (device_may_wakeup(dev)) |
121 | phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false); | |
2fc711d7 | 122 | |
a1222639 SAS |
123 | return 0; |
124 | } | |
51561001 FB |
125 | |
126 | static const struct dev_pm_ops am335x_pm_ops = { | |
127 | SET_SYSTEM_SLEEP_PM_OPS(am335x_phy_suspend, am335x_phy_resume) | |
128 | }; | |
129 | ||
2fc711d7 GC |
130 | #define DEV_PM_OPS (&am335x_pm_ops) |
131 | #else | |
132 | #define DEV_PM_OPS NULL | |
133 | #endif | |
134 | ||
3bb869c8 SAS |
135 | static const struct of_device_id am335x_phy_ids[] = { |
136 | { .compatible = "ti,am335x-usb-phy" }, | |
137 | { } | |
138 | }; | |
139 | MODULE_DEVICE_TABLE(of, am335x_phy_ids); | |
140 | ||
141 | static struct platform_driver am335x_phy_driver = { | |
142 | .probe = am335x_phy_probe, | |
143 | .remove = am335x_phy_remove, | |
144 | .driver = { | |
145 | .name = "am335x-phy-driver", | |
146 | .owner = THIS_MODULE, | |
a1222639 | 147 | .pm = DEV_PM_OPS, |
b99fffca | 148 | .of_match_table = am335x_phy_ids, |
3bb869c8 SAS |
149 | }, |
150 | }; | |
151 | ||
152 | module_platform_driver(am335x_phy_driver); | |
153 | MODULE_LICENSE("GPL v2"); |