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