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 #include <mach/regs-gpio.h>
  34
  35 #include <mach/hardware.h>
  36 #include <asm/irq.h>
  37
  38 #include <plat/usb-control.h>
  39 #include <plat/devs.h>
  40
  41 #include "usb-simtec.h"
  42
  43 /* control power and monitor over-current events on various Simtec
  44  * designed boards.
  45 */
  46
  47 static unsigned int power_state[2];
  48
  49 static void
  50 usb_simtec_powercontrol(int port, int to)
  51 {
  52         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
  53
  54         power_state[port] = to;
  55
  56         if (power_state[0] && power_state[1])
  57                 s3c2410_gpio_setpin(S3C2410_GPB(4), 0);
  58         else
  59                 s3c2410_gpio_setpin(S3C2410_GPB(4), 1);
  60 }
  61
  62 static irqreturn_t
  63 usb_simtec_ocirq(int irq, void *pw)
  64 {
  65         struct s3c2410_hcd_info *info = pw;
  66
  67         if (s3c2410_gpio_getpin(S3C2410_GPG(10)) == 0) {
  68                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
  69                 s3c2410_usb_report_oc(info, 3);
  70         } else {
  71                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
  72                 s3c2410_usb_report_oc(info, 0);
  73         }
  74
  75         return IRQ_HANDLED;
  76 }
  77
  78 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
  79 {
  80         int ret;
  81
  82         if (on) {
  83                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
  84                                   IRQF_DISABLED | IRQF_TRIGGER_RISING |
  85                                    IRQF_TRIGGER_FALLING,
  86                                   "USB Over-current", info);
  87                 if (ret != 0) {
  88                         printk(KERN_ERR "failed to request usb oc irq\n");
  89                 }
  90         } else {
  91                 free_irq(IRQ_USBOC, info);
  92         }
  93 }
  94
  95 static struct s3c2410_hcd_info usb_simtec_info = {
  96         .port[0]        = {
  97                 .flags  = S3C_HCDFLG_USED
  98         },
  99         .port[1]        = {
 100                 .flags  = S3C_HCDFLG_USED
 101         },
 102
 103         .power_control  = usb_simtec_powercontrol,
 104         .enable_oc      = usb_simtec_enableoc,
 105 };
 106
 107
 108 int usb_simtec_init(void)
 109 {
 110         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
 111         s3c_device_usb.dev.platform_data = &usb_simtec_info;
 112
 113         s3c2410_gpio_cfgpin(S3C2410_GPB(4), S3C2410_GPIO_OUTPUT);
 114         s3c2410_gpio_setpin(S3C2410_GPB(4), 1);
 115         return 0;
 116 }