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/bast-map.h> 32#include <mach/bast-irq.h> 33 34#include <mach/hardware.h> 35#include <asm/irq.h> 36 37#include <plat/usb-control.h> 38#include <plat/devs.h> 39 40#include "usb-simtec.h" 41 42/* control power and monitor over-current events on various Simtec 43 * designed boards. 44*/ 45 46static unsigned int power_state[2]; 47 48static void 49usb_simtec_powercontrol(int port, int to) 50{ 51 pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to); 52 53 power_state[port] = to; 54 55 if (power_state[0] && power_state[1]) 56 gpio_set_value(S3C2410_GPB(4), 0); 57 else 58 gpio_set_value(S3C2410_GPB(4), 1); 59} 60 61static irqreturn_t 62usb_simtec_ocirq(int irq, void *pw) 63{ 64 struct s3c2410_hcd_info *info = pw; 65 66 if (gpio_get_value(S3C2410_GPG(10)) == 0) { 67 pr_debug("usb_simtec: over-current irq (oc detected)\n"); 68 s3c2410_usb_report_oc(info, 3); 69 } else { 70 pr_debug("usb_simtec: over-current irq (oc cleared)\n"); 71 s3c2410_usb_report_oc(info, 0); 72 } 73 74 return IRQ_HANDLED; 75} 76 77static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on) 78{ 79 int ret; 80 81 if (on) { 82 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq, 83 IRQF_DISABLED | IRQF_TRIGGER_RISING | 84 IRQF_TRIGGER_FALLING, 85 "USB Over-current", info); 86 if (ret != 0) { 87 printk(KERN_ERR "failed to request usb oc irq\n"); 88 } 89 } else { 90 free_irq(IRQ_USBOC, info); 91 } 92} 93 94static struct s3c2410_hcd_info usb_simtec_info __initdata = { 95 .port[0] = { 96 .flags = S3C_HCDFLG_USED 97 }, 98 .port[1] = { 99 .flags = S3C_HCDFLG_USED 100 }, 101 102 .power_control = usb_simtec_powercontrol, 103 .enable_oc = usb_simtec_enableoc, 104}; 105 106 107int usb_simtec_init(void) 108{ 109 int ret; 110 111 printk("USB Power Control, Copyright 2004 Simtec Electronics\n"); 112 113 ret = gpio_request(S3C2410_GPB(4), "USB power control"); 114 if (ret < 0) { 115 pr_err("%s: failed to get GPB4\n", __func__); 116 return ret; 117 } 118 119 ret = gpio_request(S3C2410_GPG(10), "USB overcurrent"); 120 if (ret < 0) { 121 pr_err("%s: failed to get GPG10\n", __func__); 122 gpio_free(S3C2410_GPB(4)); 123 return ret; 124 } 125 126 /* turn power on */ 127 gpio_direction_output(S3C2410_GPB(4), 1); 128 gpio_direction_input(S3C2410_GPG(10)); 129 130 s3c_ohci_set_platdata(&usb_simtec_info); 131 return 0; 132} 133