arch/arm/mach-s3c2410/usb-simtec.c

   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/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
  46 static unsigned int power_state[2];
  47
  48 static void
  49 usb_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
  61 static irqreturn_t
  62 usb_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
  77 static 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
  94 static struct s3c2410_hcd_info usb_simtec_info = {
  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
 107 int usb_simtec_init(void)
 108 {
 109         int ret;
 110
 111         printk("USB Power Control, (c) 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_device_usb.dev.platform_data = &usb_simtec_info;
 131         return 0;
 132 }