1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* -*- linux-c -*-
*
* linux/arch/arm/mach-s3c2443/cc9m2443js-usb.c
*
* Copyright (c) 2004,2005 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* http://www.simtec.co.uk/products/EB2410ITX/
*
* Based on the Simtec platform code
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <mach/bast-map.h>
#include <mach/bast-irq.h>
#include <mach/usb-control.h>
#include <mach/regs-gpio.h>
#include <mach/gpio.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <plat/devs.h>
#include "cc9m2443js-usb.h"
/* control power and monitor over-current events on various Simtec
* designed boards.
*/
static unsigned int power_state[2];
static void cc9m2443js_usb_timer_func(unsigned long _info)
{
struct s3c2410_hcd_info *info;
info = (struct s3c2410_hcd_info *)_info;
s3c2410_usb_report_oc(info, 0);
/*
* IMPORTANT: Some power switches, like the MAX890, reports an overload
* when they are powered on. For avoiding endless overload reports it's
* required to wait for some time (> 400usecs.) before reenabling the
* interrupt line of the overload detection.
* (Luis Galdos)
*/
mdelay(1);
enable_irq(info->oc_irq);
}
/*
* If the USB-PHY is used as second root hub port, then we must take care of its
* current state, otherwise only the first port is considered.
*/
#if defined(CONFIG_S3C2443_USB_PHY_PORT)
# define CC9M2443JS_USB_PORT_ON(state) (state[0] && state[1])
#else
# define CC9M2443JS_USB_PORT_ON(state) (state[0])
#endif /* CONFIG_S3C2443_USB_PHY_PORT */
static void cc9m2443js_usb_powercontrol(struct s3c2410_hcd_info * info, int port, int to)
{
pr_debug("USB power: port %d | to %d [%d %d]\n",
port, to, power_state[0], power_state[1]);
power_state[port] = to;
/* @XXX: Power control without a configured GPIO? */
if (!info->pw_gpio)
return;
if (CC9M2443JS_USB_PORT_ON(power_state))
s3c2443_gpio_setpin(info->pw_gpio, 1 ^ info->pw_gpio_inv);
else
s3c2443_gpio_setpin(info->pw_gpio, 0 ^ info->pw_gpio_inv);
}
static irqreturn_t cc9m2443js_usb_ocirq(int irq, void *_info)
{
struct s3c2410_hcd_info *info = _info;
if (s3c2410_gpio_getpin(info->oc_gpio) == 0) {
s3c2410_usb_report_oc(info, 3);
pr_info("USB IRQ: Overcurrent Detected\n");
} else {
disable_irq(info->oc_irq);
pr_debug("USB IRQ: Scheduling timer for clearing OC\n");
mod_timer(&info->timer, jiffies + jiffies_to_msecs(100));
}
return IRQ_HANDLED;
}
/*
* The S3C2443 doesn't have a dedicated interrupt for the OC detection.
* We use the external interrupt line connected to the GPG8
*/
static void cc9m2443js_usb_enableoc(struct s3c2410_hcd_info *info, int on)
{
int ret;
pr_debug("Command to %s OC detection\n", on ? "enable" : "disable");
info->oc_irq = s3c2443_gpio_getirq(info->oc_gpio);
if (info->oc_irq < 0) {
printk(KERN_ERR "[ ERROR ] Couldn't get a GPIO interrupt\n");
return;
}
if (on) {
ret = request_irq(info->oc_irq, cc9m2443js_usb_ocirq,
IRQF_DISABLED | IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING,
"s3c2443 USB OC", info);
if (ret != 0)
printk(KERN_ERR "[ ERROR ] Failed to request usb oc irq\n");
} else
free_irq(info->oc_irq, info);
}
static struct s3c2410_hcd_info cc9m2443js_usb_info = {
.port[0] = {
.flags = S3C_HCDFLG_USED
},
/* Enable the second port if required */
#if defined(CONFIG_S3C2443_USB_PHY_PORT)
.port[1] = {
.flags = S3C_HCDFLG_USED
},
#endif /* CONFIG_S3C2443_USB_PHY_PORT */
.power_control = cc9m2443js_usb_powercontrol,
.enable_oc = cc9m2443js_usb_enableoc,
/* Over current GPIO */
.oc_gpio = S3C2410_GPG8,
.oc_gpio_cfg = S3C2410_GPG8_EINT16,
/* Power switch GPIO (inverted by the CC9M2443JS) */
.pw_gpio = S3C2410_GPA14,
.pw_gpio_cfg = S3C2410_GPA14_OUT,
.pw_gpio_inv = 1,
};
int __init cc9m2443js_usb_init(void)
{
struct s3c2410_hcd_info *info = &cc9m2443js_usb_info;
s3c_device_usb.dev.platform_data = &cc9m2443js_usb_info;
/* Configure the GPIO and disable the pullups */
if (info->oc_gpio) {
s3c2443_gpio_cfgpin(info->oc_gpio, info->oc_gpio_cfg);
s3c2443_gpio_extpull(info->oc_gpio, 0);
s3c2443_gpio_set_udp(info->oc_gpio, 1);
}
if (info->pw_gpio) {
s3c2443_gpio_cfgpin(info->pw_gpio, info->pw_gpio_cfg);
/* At first power off the ports */
s3c2443_gpio_setpin(info->pw_gpio, 0 ^ info->pw_gpio_inv);
}
/* Init the internal timer */
init_timer(&info->timer);
info->timer.expires = 0;
info->timer.data = (unsigned long)info;
info->timer.function = cc9m2443js_usb_timer_func;
add_timer(&info->timer);
return 0;
}
|
