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
usb_simtec_powercontrol(int port,int to)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
usb_simtec_ocirq(int irq,void * pw)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
usb_simtec_enableoc(struct s3c2410_hcd_info * info,int on)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
usb_simtec_init(void)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 }
133