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
45static unsigned int power_state[2];
46
47static void
48usb_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
60static irqreturn_t
61usb_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
76static 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
92static 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
105int __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