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1 | /* |
2 | * phy-keystone - USB PHY, talking to dwc3 controller in Keystone. | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * Author: WingMan Kwok <w-kwok2@ti.com> | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
d7078df6 | 21 | #include <linux/usb/usb_phy_generic.h> |
25acdd08 WK |
22 | #include <linux/io.h> |
23 | #include <linux/of.h> | |
24 | ||
25 | #include "phy-generic.h" | |
26 | ||
27 | /* USB PHY control register offsets */ | |
28 | #define USB_PHY_CTL_UTMI 0x0000 | |
29 | #define USB_PHY_CTL_PIPE 0x0004 | |
30 | #define USB_PHY_CTL_PARAM_1 0x0008 | |
31 | #define USB_PHY_CTL_PARAM_2 0x000c | |
32 | #define USB_PHY_CTL_CLOCK 0x0010 | |
33 | #define USB_PHY_CTL_PLL 0x0014 | |
34 | ||
35 | #define PHY_REF_SSP_EN BIT(29) | |
36 | ||
37 | struct keystone_usbphy { | |
4525beeb | 38 | struct usb_phy_generic usb_phy_gen; |
25acdd08 WK |
39 | void __iomem *phy_ctrl; |
40 | }; | |
41 | ||
42 | static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset) | |
43 | { | |
44 | return readl(base + offset); | |
45 | } | |
46 | ||
47 | static inline void keystone_usbphy_writel(void __iomem *base, | |
48 | u32 offset, u32 value) | |
49 | { | |
50 | writel(value, base + offset); | |
51 | } | |
52 | ||
53 | static int keystone_usbphy_init(struct usb_phy *phy) | |
54 | { | |
55 | struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); | |
56 | u32 val; | |
57 | ||
58 | val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); | |
59 | keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, | |
60 | val | PHY_REF_SSP_EN); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | static void keystone_usbphy_shutdown(struct usb_phy *phy) | |
65 | { | |
66 | struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); | |
67 | u32 val; | |
68 | ||
69 | val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); | |
70 | keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, | |
71 | val &= ~PHY_REF_SSP_EN); | |
72 | } | |
73 | ||
74 | static int keystone_usbphy_probe(struct platform_device *pdev) | |
75 | { | |
76 | struct device *dev = &pdev->dev; | |
77 | struct keystone_usbphy *k_phy; | |
78 | struct resource *res; | |
79 | int ret; | |
80 | ||
81 | k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL); | |
82 | if (!k_phy) | |
83 | return -ENOMEM; | |
84 | ||
85 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
25acdd08 WK |
86 | k_phy->phy_ctrl = devm_ioremap_resource(dev, res); |
87 | if (IS_ERR(k_phy->phy_ctrl)) | |
88 | return PTR_ERR(k_phy->phy_ctrl); | |
89 | ||
c139e142 | 90 | ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL); |
25acdd08 WK |
91 | if (ret) |
92 | return ret; | |
93 | ||
94 | k_phy->usb_phy_gen.phy.init = keystone_usbphy_init; | |
95 | k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown; | |
96 | ||
97 | platform_set_drvdata(pdev, k_phy); | |
98 | ||
a9c5d8fe | 99 | return usb_add_phy_dev(&k_phy->usb_phy_gen.phy); |
25acdd08 WK |
100 | } |
101 | ||
102 | static int keystone_usbphy_remove(struct platform_device *pdev) | |
103 | { | |
104 | struct keystone_usbphy *k_phy = platform_get_drvdata(pdev); | |
105 | ||
106 | usb_remove_phy(&k_phy->usb_phy_gen.phy); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static const struct of_device_id keystone_usbphy_ids[] = { | |
112 | { .compatible = "ti,keystone-usbphy" }, | |
113 | { } | |
114 | }; | |
115 | MODULE_DEVICE_TABLE(of, keystone_usbphy_ids); | |
116 | ||
117 | static struct platform_driver keystone_usbphy_driver = { | |
118 | .probe = keystone_usbphy_probe, | |
119 | .remove = keystone_usbphy_remove, | |
120 | .driver = { | |
121 | .name = "keystone-usbphy", | |
ed40082d | 122 | .of_match_table = keystone_usbphy_ids, |
25acdd08 WK |
123 | }, |
124 | }; | |
125 | ||
126 | module_platform_driver(keystone_usbphy_driver); | |
127 | ||
128 | MODULE_ALIAS("platform:keystone-usbphy"); | |
129 | MODULE_AUTHOR("Texas Instruments Inc."); | |
130 | MODULE_DESCRIPTION("Keystone USB phy driver"); | |
131 | MODULE_LICENSE("GPL v2"); |