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Aaro Koskinen449d2ba2013-12-06 16:13:06 +02001/*
2 * OMAP OTG controller driver
3 *
4 * Based on code from tahvo-usb.c and isp1301_omap.c drivers.
5 *
6 * Copyright (C) 2005-2006 Nokia Corporation
7 * Copyright (C) 2004 Texas Instruments
8 * Copyright (C) 2004 David Brownell
9 *
10 * This file is subject to the terms and conditions of the GNU General
11 * Public License. See the file "COPYING" in the main directory of this
12 * archive for more details.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <linux/io.h>
21#include <linux/err.h>
22#include <linux/extcon.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/interrupt.h>
26#include <linux/platform_device.h>
27#include <linux/platform_data/usb-omap1.h>
28
29struct otg_device {
30 void __iomem *base;
31 bool id;
32 bool vbus;
Chanwoo Choia2fd2422015-07-01 13:11:31 +090033 struct extcon_dev *extcon;
Aaro Koskinen449d2ba2013-12-06 16:13:06 +020034 struct notifier_block vbus_nb;
35 struct notifier_block id_nb;
36};
37
38#define OMAP_OTG_CTRL 0x0c
39#define OMAP_OTG_ASESSVLD (1 << 20)
40#define OMAP_OTG_BSESSEND (1 << 19)
41#define OMAP_OTG_BSESSVLD (1 << 18)
42#define OMAP_OTG_VBUSVLD (1 << 17)
43#define OMAP_OTG_ID (1 << 16)
44#define OMAP_OTG_XCEIV_OUTPUTS \
45 (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
46 OMAP_OTG_VBUSVLD | OMAP_OTG_ID)
47
48static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
49{
50 u32 l;
51
52 l = readl(otg_dev->base + OMAP_OTG_CTRL);
53 l &= ~OMAP_OTG_XCEIV_OUTPUTS;
54 l |= outputs;
55 writel(l, otg_dev->base + OMAP_OTG_CTRL);
56}
57
58static void omap_otg_set_mode(struct otg_device *otg_dev)
59{
60 if (!otg_dev->id && otg_dev->vbus)
61 /* Set B-session valid. */
62 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
63 else if (otg_dev->vbus)
64 /* Set A-session valid. */
65 omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
66 else if (!otg_dev->id)
67 /* Set B-session end to indicate no VBUS. */
68 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
69}
70
71static int omap_otg_id_notifier(struct notifier_block *nb,
72 unsigned long event, void *ptr)
73{
74 struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
75
76 otg_dev->id = event;
77 omap_otg_set_mode(otg_dev);
78
79 return NOTIFY_DONE;
80}
81
82static int omap_otg_vbus_notifier(struct notifier_block *nb,
83 unsigned long event, void *ptr)
84{
85 struct otg_device *otg_dev = container_of(nb, struct otg_device,
86 vbus_nb);
87
88 otg_dev->vbus = event;
89 omap_otg_set_mode(otg_dev);
90
91 return NOTIFY_DONE;
92}
93
94static int omap_otg_probe(struct platform_device *pdev)
95{
96 const struct omap_usb_config *config = pdev->dev.platform_data;
97 struct otg_device *otg_dev;
98 struct extcon_dev *extcon;
99 int ret;
100 u32 rev;
101
102 if (!config || !config->extcon)
103 return -ENODEV;
104
105 extcon = extcon_get_extcon_dev(config->extcon);
106 if (!extcon)
107 return -EPROBE_DEFER;
108
109 otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
110 if (!otg_dev)
111 return -ENOMEM;
112
113 otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
114 if (IS_ERR(otg_dev->base))
115 return PTR_ERR(otg_dev->base);
116
Aaro Koskinen2c2025b2015-10-27 23:26:33 +0200117 otg_dev->extcon = extcon;
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200118 otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
119 otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
120
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900121 ret = extcon_register_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb);
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200122 if (ret)
123 return ret;
124
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900125 ret = extcon_register_notifier(extcon, EXTCON_USB, &otg_dev->vbus_nb);
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200126 if (ret) {
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900127 extcon_unregister_notifier(extcon, EXTCON_USB_HOST,
128 &otg_dev->id_nb);
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200129 return ret;
130 }
131
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900132 otg_dev->id = extcon_get_cable_state_(extcon, EXTCON_USB_HOST);
133 otg_dev->vbus = extcon_get_cable_state_(extcon, EXTCON_USB);
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200134 omap_otg_set_mode(otg_dev);
135
136 rev = readl(otg_dev->base);
137
138 dev_info(&pdev->dev,
139 "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
140 (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
141 otg_dev->vbus);
142
Wei Yongjunec57fcd2016-07-26 14:48:39 +0000143 platform_set_drvdata(pdev, otg_dev);
144
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200145 return 0;
146}
147
148static int omap_otg_remove(struct platform_device *pdev)
149{
150 struct otg_device *otg_dev = platform_get_drvdata(pdev);
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900151 struct extcon_dev *edev = otg_dev->extcon;
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200152
Sandhya Bankar7c8b9c32016-05-31 08:59:44 -0400153 extcon_unregister_notifier(edev, EXTCON_USB_HOST, &otg_dev->id_nb);
Chanwoo Choia2fd2422015-07-01 13:11:31 +0900154 extcon_unregister_notifier(edev, EXTCON_USB, &otg_dev->vbus_nb);
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200155
156 return 0;
157}
158
159static struct platform_driver omap_otg_driver = {
160 .probe = omap_otg_probe,
161 .remove = omap_otg_remove,
162 .driver = {
Aaro Koskinen449d2ba2013-12-06 16:13:06 +0200163 .name = "omap_otg",
164 },
165};
166module_platform_driver(omap_otg_driver);
167
168MODULE_DESCRIPTION("OMAP USB OTG controller driver");
169MODULE_LICENSE("GPL");
170MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");