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
25#include <asm/mach/arch.h>
26#include <asm/mach/map.h>
27#include <asm/mach/irq.h>
28
29#include <asm/arch/bast-map.h>
30#include <asm/arch/bast-irq.h>
31#include <asm/arch/usb-control.h>
32#include <asm/arch/regs-gpio.h>
33
34#include <asm/hardware.h>
35#include <asm/io.h>
36#include <asm/irq.h>
37
38#include <asm/plat-s3c24xx/devs.h>
39#include "usb-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		s3c2410_gpio_setpin(S3C2410_GPB4, 0);
56	else
57		s3c2410_gpio_setpin(S3C2410_GPB4, 1);
58}
59
60static irqreturn_t
61usb_simtec_ocirq(int irq, void *pw)
62{
63	struct s3c2410_hcd_info *info = (struct s3c2410_hcd_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
76static 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
93static 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
106int 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