Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux...
[pandora-kernel.git] / arch / arm / mach-s3c2410 / usb-simtec.c
1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
2  *
3  * Copyright 2004-2005 Simtec Electronics
4  *   Ben Dooks <ben@simtec.co.uk>
5  *
6  * http://www.simtec.co.uk/products/EB2410ITX/
7  *
8  * Simtec BAST and Thorcom VR1000 USB port support functions
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13 */
14
15 #define DEBUG
16
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/list.h>
21 #include <linux/gpio.h>
22 #include <linux/timer.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/io.h>
26
27 #include <asm/mach/arch.h>
28 #include <asm/mach/map.h>
29 #include <asm/mach/irq.h>
30
31 #include <mach/bast-map.h>
32 #include <mach/bast-irq.h>
33
34 #include <mach/hardware.h>
35 #include <asm/irq.h>
36
37 #include <plat/usb-control.h>
38 #include <plat/devs.h>
39
40 #include "usb-simtec.h"
41
42 /* control power and monitor over-current events on various Simtec
43  * designed boards.
44 */
45
46 static unsigned int power_state[2];
47
48 static void
49 usb_simtec_powercontrol(int port, int to)
50 {
51         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
52
53         power_state[port] = to;
54
55         if (power_state[0] && power_state[1])
56                 gpio_set_value(S3C2410_GPB(4), 0);
57         else
58                 gpio_set_value(S3C2410_GPB(4), 1);
59 }
60
61 static irqreturn_t
62 usb_simtec_ocirq(int irq, void *pw)
63 {
64         struct s3c2410_hcd_info *info = pw;
65
66         if (gpio_get_value(S3C2410_GPG(10)) == 0) {
67                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
68                 s3c2410_usb_report_oc(info, 3);
69         } else {
70                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
71                 s3c2410_usb_report_oc(info, 0);
72         }
73
74         return IRQ_HANDLED;
75 }
76
77 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
78 {
79         int ret;
80
81         if (on) {
82                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
83                                   IRQF_DISABLED | IRQF_TRIGGER_RISING |
84                                    IRQF_TRIGGER_FALLING,
85                                   "USB Over-current", info);
86                 if (ret != 0) {
87                         printk(KERN_ERR "failed to request usb oc irq\n");
88                 }
89         } else {
90                 free_irq(IRQ_USBOC, info);
91         }
92 }
93
94 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
95         .port[0]        = {
96                 .flags  = S3C_HCDFLG_USED
97         },
98         .port[1]        = {
99                 .flags  = S3C_HCDFLG_USED
100         },
101
102         .power_control  = usb_simtec_powercontrol,
103         .enable_oc      = usb_simtec_enableoc,
104 };
105
106
107 int usb_simtec_init(void)
108 {
109         int ret;
110
111         printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
112
113         ret = gpio_request(S3C2410_GPB(4), "USB power control");
114         if (ret < 0) {
115                 pr_err("%s: failed to get GPB4\n", __func__);
116                 return ret;
117         }
118
119         ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
120         if (ret < 0) {
121                 pr_err("%s: failed to get GPG10\n", __func__);
122                 gpio_free(S3C2410_GPB(4));
123                 return ret;
124         }
125
126         /* turn power on */
127         gpio_direction_output(S3C2410_GPB(4), 1);
128         gpio_direction_input(S3C2410_GPG(10));
129
130         s3c_ohci_set_platdata(&usb_simtec_info);
131         return 0;
132 }