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}