1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
2 *
3 * Copyright (c) 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/timer.h>
22 #include <linux/init.h>
23 #include <linux/device.h>
24 #include <linux/io.h>
25
26 #include <asm/mach/arch.h>
27 #include <asm/mach/map.h>
28 #include <asm/mach/irq.h>
29
30 #include <mach/bast-map.h>
31 #include <mach/bast-irq.h>
32 #include <mach/usb-control.h>
33 #include <mach/regs-gpio.h>
34
35 #include <mach/hardware.h>
36 #include <asm/irq.h>
37
38 #include <plat/devs.h>
39 #include "usb-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 s3c2410_gpio_setpin(S3C2410_GPB4, 0);
56 else
57 s3c2410_gpio_setpin(S3C2410_GPB4, 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 (s3c2410_gpio_getpin(S3C2410_GPG10) == 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(IRQ_USBOC, usb_simtec_ocirq,
82 IRQF_DISABLED | IRQF_TRIGGER_RISING |
83 IRQF_TRIGGER_FALLING,
84 "USB Over-current", info);
85 if (ret != 0) {
86 printk(KERN_ERR "failed to request usb oc irq\n");
87 }
88 } else {
89 free_irq(IRQ_USBOC, info);
90 }
91 }
92
93 static struct s3c2410_hcd_info usb_simtec_info = {
94 .port[0] = {
95 .flags = S3C_HCDFLG_USED
96 },
97 .port[1] = {
98 .flags = S3C_HCDFLG_USED
99 },
100
101 .power_control = usb_simtec_powercontrol,
102 .enable_oc = usb_simtec_enableoc,
103 };
104
105
usb_simtec_init(void)106 int usb_simtec_init(void)
107 {
108 printk("USB Power Control, (c) 2004 Simtec Electronics\n");
109 s3c_device_usb.dev.platform_data = &usb_simtec_info;
110
111 s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
112 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
113 return 0;
114 }
115