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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
3bb869c8 SAS |
2 | #include <linux/module.h> |
3 | #include <linux/platform_device.h> | |
4 | #include <linux/dma-mapping.h> | |
5 | #include <linux/usb/otg.h> | |
d7078df6 | 6 | #include <linux/usb/usb_phy_generic.h> |
3bb869c8 SAS |
7 | #include <linux/slab.h> |
8 | #include <linux/clk.h> | |
3bb869c8 SAS |
9 | #include <linux/of.h> |
10 | #include <linux/of_address.h> | |
59f042f6 | 11 | #include <linux/usb/of.h> |
3bb869c8 | 12 | |
5306661e | 13 | #include "phy-am335x-control.h" |
3bb869c8 SAS |
14 | #include "phy-generic.h" |
15 | ||
16 | struct am335x_phy { | |
4525beeb | 17 | struct usb_phy_generic usb_phy_gen; |
3bb869c8 SAS |
18 | struct phy_control *phy_ctrl; |
19 | int id; | |
59f042f6 | 20 | enum usb_dr_mode dr_mode; |
3bb869c8 SAS |
21 | }; |
22 | ||
23 | static int am335x_init(struct usb_phy *phy) | |
24 | { | |
25 | struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); | |
26 | ||
59f042f6 | 27 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true); |
3bb869c8 SAS |
28 | return 0; |
29 | } | |
30 | ||
31 | static void am335x_shutdown(struct usb_phy *phy) | |
32 | { | |
33 | struct am335x_phy *am_phy = dev_get_drvdata(phy->dev); | |
34 | ||
59f042f6 | 35 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
3bb869c8 SAS |
36 | } |
37 | ||
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; | |
59f042f6 | 51 | |
3bb869c8 SAS |
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 | ||
ce15ed4c | 58 | am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1); |
59f042f6 | 59 | |
b267ddf6 | 60 | ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen); |
3bb869c8 SAS |
61 | if (ret) |
62 | return ret; | |
63 | ||
3bb869c8 SAS |
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); | |
2fc711d7 GC |
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); | |
59f042f6 | 80 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
4d175f34 | 81 | |
a53469a6 | 82 | return usb_add_phy_dev(&am_phy->usb_phy_gen.phy); |
3bb869c8 SAS |
83 | } |
84 | ||
85 | static int 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 | return 0; | |
91 | } | |
92 | ||
2fc711d7 GC |
93 | #ifdef CONFIG_PM_SLEEP |
94 | static int am335x_phy_suspend(struct device *dev) | |
a1222639 | 95 | { |
8bffbdb6 | 96 | struct am335x_phy *am_phy = dev_get_drvdata(dev); |
a1222639 | 97 | |
2fc711d7 GC |
98 | /* |
99 | * Enable phy wakeup only if dev->power.can_wakeup is true. | |
100 | * Make sure to enable wakeup to support remote wakeup in | |
101 | * standby mode ( same is not supported in OFF(DS0) mode). | |
102 | * Enable it by doing | |
103 | * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup | |
104 | */ | |
105 | ||
a1222639 SAS |
106 | if (device_may_wakeup(dev)) |
107 | phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true); | |
2fc711d7 | 108 | |
59f042f6 | 109 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false); |
2fc711d7 | 110 | |
a1222639 SAS |
111 | return 0; |
112 | } | |
113 | ||
2fc711d7 | 114 | static int am335x_phy_resume(struct device *dev) |
a1222639 | 115 | { |
8bffbdb6 | 116 | struct am335x_phy *am_phy = dev_get_drvdata(dev); |
a1222639 | 117 | |
59f042f6 | 118 | phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, 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 | } | |
2fc711d7 GC |
125 | #endif |
126 | ||
1e32cda8 JH |
127 | static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume); |
128 | ||
3bb869c8 SAS |
129 | static const struct of_device_id am335x_phy_ids[] = { |
130 | { .compatible = "ti,am335x-usb-phy" }, | |
131 | { } | |
132 | }; | |
133 | MODULE_DEVICE_TABLE(of, am335x_phy_ids); | |
134 | ||
135 | static struct platform_driver am335x_phy_driver = { | |
136 | .probe = am335x_phy_probe, | |
137 | .remove = am335x_phy_remove, | |
138 | .driver = { | |
139 | .name = "am335x-phy-driver", | |
1e32cda8 | 140 | .pm = &am335x_pm_ops, |
b99fffca | 141 | .of_match_table = am335x_phy_ids, |
3bb869c8 SAS |
142 | }, |
143 | }; | |
144 | ||
145 | module_platform_driver(am335x_phy_driver); | |
146 | MODULE_LICENSE("GPL v2"); |