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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* linux/arch/arm/mach-s3c2410/usb-simtec.c
2 *
3 * Copyright (c) 2004 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 * Modifications:
15 * 14-Sep-2004 BJD Created
16 * 18-Oct-2004 BJD Cleanups, and added code to report OC cleared
17*/
18
19#define DEBUG
20
21#include <linux/kernel.h>
22#include <linux/types.h>
23#include <linux/interrupt.h>
24#include <linux/list.h>
25#include <linux/timer.h>
26#include <linux/init.h>
27#include <linux/device.h>
28
29#include <asm/mach/arch.h>
30#include <asm/mach/map.h>
31#include <asm/mach/irq.h>
32
33#include <asm/arch/bast-map.h>
34#include <asm/arch/bast-irq.h>
35#include <asm/arch/usb-control.h>
36#include <asm/arch/regs-gpio.h>
37
38#include <asm/hardware.h>
39#include <asm/io.h>
40#include <asm/irq.h>
41#include <asm/mach-types.h>
42
43#include "devs.h"
44#include "usb-simtec.h"
45
46/* control power and monitor over-current events on various Simtec
47 * designed boards.
48*/
49
50static void
51usb_simtec_powercontrol(int port, int to)
52{
53 pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
54
55 if (port == 1)
56 s3c2410_gpio_setpin(S3C2410_GPB4, to ? 0:1);
57}
58
59static irqreturn_t
60usb_simtec_ocirq(int irq, void *pw, struct pt_regs *regs)
61{
62 struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
63
64 if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
65 pr_debug("usb_simtec: over-current irq (oc detected)\n");
66 s3c2410_report_oc(info, 3);
67 } else {
68 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
69 s3c2410_report_oc(info, 0);
70 }
71
72 return IRQ_HANDLED;
73}
74
75static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
76{
77 int ret;
78
79 if (on) {
80 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq, SA_INTERRUPT,
81 "USB Over-current", info);
82 if (ret != 0) {
83 printk(KERN_ERR "failed to request usb oc irq\n");
84 }
85
86 set_irq_type(IRQ_USBOC, IRQT_BOTHEDGE);
87 } else {
88 free_irq(IRQ_USBOC, info);
89 }
90}
91
92static struct s3c2410_hcd_info usb_simtec_info = {
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
105int usb_simtec_init(void)
106{
107 printk("USB Power Control, (c) 2004 Simtec Electronics\n");
108 s3c_device_usb.dev.platform_data = &usb_simtec_info;
109
110 s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
111 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
112 return 0;
113}