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 <mach/gpio-samsung.h>
33 #include <asm/irq.h>
34
35 #include <linux/platform_data/usb-ohci-s3c2410.h>
36 #include <plat/devs.h>
37
38 #include "bast.h"
39 #include "simtec.h"
40
41 /* control power and monitor over-current events on various Simtec
42 * designed boards.
43 */
44
45 static unsigned int power_state[2];
46
47 static void
usb_simtec_powercontrol(int port,int to)48 usb_simtec_powercontrol(int port, int to)
49 {
50 pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
51
52 power_state[port] = to;
53
54 if (power_state[0] && power_state[1])
55 gpio_set_value(S3C2410_GPB(4), 0);
56 else
57 gpio_set_value(S3C2410_GPB(4), 1);
58 }
59
60 static irqreturn_t
usb_simtec_ocirq(int irq,void * pw)61 usb_simtec_ocirq(int irq, void *pw)
62 {
63 struct s3c2410_hcd_info *info = pw;
64
65 if (gpio_get_value(S3C2410_GPG(10)) == 0) {
66 pr_debug("usb_simtec: over-current irq (oc detected)\n");
67 s3c2410_usb_report_oc(info, 3);
68 } else {
69 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
70 s3c2410_usb_report_oc(info, 0);
71 }
72
73 return IRQ_HANDLED;
74 }
75
usb_simtec_enableoc(struct s3c2410_hcd_info * info,int on)76 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
77 {
78 int ret;
79
80 if (on) {
81 ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
82 IRQF_TRIGGER_RISING | 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
usb_simtec_init(void)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 }
131