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[karo-tx-linux.git] / arch / arm / mach-s3c24xx / simtec-usb.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/hardware.h>
32 #include <asm/irq.h>
33
34 #include <linux/platform_data/usb-ohci-s3c2410.h>
35 #include <plat/devs.h>
36
37 #include "bast.h"
38 #include "simtec.h"
39
40 /* control power and monitor over-current events on various Simtec
41  * designed boards.
42 */
43
44 static unsigned int power_state[2];
45
46 static void
47 usb_simtec_powercontrol(int port, int to)
48 {
49         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
50
51         power_state[port] = to;
52
53         if (power_state[0] && power_state[1])
54                 gpio_set_value(S3C2410_GPB(4), 0);
55         else
56                 gpio_set_value(S3C2410_GPB(4), 1);
57 }
58
59 static irqreturn_t
60 usb_simtec_ocirq(int irq, void *pw)
61 {
62         struct s3c2410_hcd_info *info = pw;
63
64         if (gpio_get_value(S3C2410_GPG(10)) == 0) {
65                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
66                 s3c2410_usb_report_oc(info, 3);
67         } else {
68                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
69                 s3c2410_usb_report_oc(info, 0);
70         }
71
72         return IRQ_HANDLED;
73 }
74
75 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
76 {
77         int ret;
78
79         if (on) {
80                 ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
81                                   IRQF_DISABLED | IRQF_TRIGGER_RISING |
82                                    IRQF_TRIGGER_FALLING,
83                                   "USB Over-current", info);
84                 if (ret != 0) {
85                         printk(KERN_ERR "failed to request usb oc irq\n");
86                 }
87         } else {
88                 free_irq(BAST_IRQ_USBOC, info);
89         }
90 }
91
92 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
93         .port[0]        = {
94                 .flags  = S3C_HCDFLG_USED
95         },
96         .port[1]        = {
97                 .flags  = S3C_HCDFLG_USED
98         },
99
100         .power_control  = usb_simtec_powercontrol,
101         .enable_oc      = usb_simtec_enableoc,
102 };
103
104
105 int __init usb_simtec_init(void)
106 {
107         int ret;
108
109         printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
110
111         ret = gpio_request(S3C2410_GPB(4), "USB power control");
112         if (ret < 0) {
113                 pr_err("%s: failed to get GPB4\n", __func__);
114                 return ret;
115         }
116
117         ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
118         if (ret < 0) {
119                 pr_err("%s: failed to get GPG10\n", __func__);
120                 gpio_free(S3C2410_GPB(4));
121                 return ret;
122         }
123
124         /* turn power on */
125         gpio_direction_output(S3C2410_GPB(4), 1);
126         gpio_direction_input(S3C2410_GPG(10));
127
128         s3c_ohci_set_platdata(&usb_simtec_info);
129         return 0;
130 }