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Diffstat (limited to 'drivers/usb/phy/phy-keystone.c')
-rw-r--r--drivers/usb/phy/phy-keystone.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-keystone.c b/drivers/usb/phy/phy-keystone.c
new file mode 100644
index 00000000000..b9a9c796270
--- /dev/null
+++ b/drivers/usb/phy/phy-keystone.c
@@ -0,0 +1,151 @@
1/*
2 * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
3 *
4 * Copyright (C) 2014 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>
21#include <linux/usb/otg.h>
22#include <linux/io.h>
23#include <linux/of.h>
24
25/* USB PHY control register offsets */
26#define USB_PHY_CTL_UTMI 0x0000
27#define USB_PHY_CTL_PIPE 0x0004
28#define USB_PHY_CTL_PARAM_1 0x0008
29#define USB_PHY_CTL_PARAM_2 0x000c
30#define USB_PHY_CTL_CLOCK 0x0010
31#define USB_PHY_CTL_PLL 0x0014
32
33#define PHY_REF_SSP_EN BIT(29)
34
35struct keystone_usbphy {
36 struct usb_phy phy;
37 struct device *dev;
38 void __iomem *phy_ctrl;
39};
40
41static inline u32 k_usbphy_readl(void __iomem *base, u32 offset)
42{
43 return readl(base + offset);
44}
45
46static inline void k_usbphy_writel(void __iomem *base,
47 u32 offset, u32 value)
48{
49 writel(value, base + offset);
50}
51
52static int k_usbphy_set_suspend(struct usb_phy *x, int suspend)
53{
54 return 0;
55}
56
57static int k_usbphy_init(struct usb_phy *phy)
58{
59 struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
60 u32 val;
61
62 val = k_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
63 k_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
64 val | PHY_REF_SSP_EN);
65 return 0;
66}
67
68static void k_usbphy_shutdown(struct usb_phy *phy)
69{
70 struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
71 u32 val;
72
73 val = k_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
74 k_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
75 val &= ~PHY_REF_SSP_EN);
76}
77
78static int k_usbphy_create_phy(struct device *dev, struct keystone_usbphy *kphy)
79{
80 enum usb_phy_type type = USB_PHY_TYPE_USB2;
81
82 kphy->dev = dev;
83 kphy->phy.dev = kphy->dev;
84 kphy->phy.label = "k_usbphy-xceiv";
85 kphy->phy.set_suspend = k_usbphy_set_suspend;
86 kphy->phy.init = k_usbphy_init;
87 kphy->phy.shutdown = k_usbphy_shutdown;
88
89 kphy->phy.state = OTG_STATE_UNDEFINED;
90 kphy->phy.type = type;
91
92 return 0;
93}
94
95static int k_usbphy_probe(struct platform_device *pdev)
96{
97 struct device *dev = &pdev->dev;
98 struct keystone_usbphy *k_phy;
99 struct resource *res;
100 int ret;
101
102 k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
103 if (!k_phy)
104 return -ENOMEM;
105
106 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
108 if (IS_ERR(k_phy->phy_ctrl))
109 return PTR_ERR(k_phy->phy_ctrl);
110
111 ret = k_usbphy_create_phy(dev, k_phy);
112 if (ret)
113 return ret;
114
115 platform_set_drvdata(pdev, k_phy);
116
117 ret = usb_add_phy_dev(&k_phy->phy);
118 return ret;
119}
120
121static int k_usbphy_remove(struct platform_device *pdev)
122{
123 struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
124
125 usb_remove_phy(&k_phy->phy);
126
127 return 0;
128}
129
130static const struct of_device_id keystone_usbphy_ids[] = {
131 { .compatible = "ti,keystone-usbphy" },
132 { }
133};
134MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
135
136static struct platform_driver keystone_usbphy_driver = {
137 .probe = k_usbphy_probe,
138 .remove = k_usbphy_remove,
139 .driver = {
140 .name = "keystone-usbphy",
141 .owner = THIS_MODULE,
142 .of_match_table = keystone_usbphy_ids,
143 },
144};
145
146module_platform_driver(keystone_usbphy_driver);
147
148MODULE_ALIAS("platform:keystone-usbphy");
149MODULE_AUTHOR("WingMan Kwok");
150MODULE_DESCRIPTION("Keystone USB phy driver");
151MODULE_LICENSE("GPL v2");