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/timer.h>
  22 #include <linux/init.h>
  23 #include <linux/device.h>
  24
  25 #include <asm/mach/arch.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach/irq.h>
  28
  29 #include <asm/arch/bast-map.h>
  30 #include <asm/arch/bast-irq.h>
  31 #include <asm/arch/usb-control.h>
  32 #include <asm/arch/regs-gpio.h>
  33
  34 #include <asm/hardware.h>
  35 #include <asm/io.h>
  36 #include <asm/irq.h>
  37
  38 #include <asm/plat-s3c24xx/devs.h>
  39 #include "usb-simtec.h"
  40
  41 /* control power and monitor over-current events on various Simtec
  42  * designed boards.
  43 */
  44
  45 static unsigned int power_state[2];
  46
  47 static void
  48 usb_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                 s3c2410_gpio_setpin(S3C2410_GPB4, 0);
  56         else
  57                 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
  58 }
  59
  60 static irqreturn_t
  61 usb_simtec_ocirq(int irq, void *pw)
  62 {
  63         struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
  64
  65         if (s3c2410_gpio_getpin(S3C2410_GPG10) == 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
  76 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
  77 {
  78         int ret;
  79
  80         if (on) {
  81                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
  82                                   IRQF_DISABLED | IRQF_TRIGGER_RISING |
  83                                    IRQF_TRIGGER_FALLING,
  84                                   "USB Over-current", info);
  85                 if (ret != 0) {
  86                         printk(KERN_ERR "failed to request usb oc irq\n");
  87                 }
  88         } else {
  89                 free_irq(IRQ_USBOC, info);
  90         }
  91 }
  92
  93 static struct s3c2410_hcd_info usb_simtec_info = {
  94         .port[0]        = {
  95                 .flags  = S3C_HCDFLG_USED
  96         },
  97         .port[1]        = {
  98                 .flags  = S3C_HCDFLG_USED
  99         },
 100
 101         .power_control  = usb_simtec_powercontrol,
 102         .enable_oc      = usb_simtec_enableoc,
 103 };
 104
 105
 106 int usb_simtec_init(void)
 107 {
 108         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
 109         s3c_device_usb.dev.platform_data = &usb_simtec_info;
 110
 111         s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
 112         s3c2410_gpio_setpin(S3C2410_GPB4, 1);
 113         return 0;
 114 }