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   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  * Modifications:
  15  *      14-Sep-2004 BJD  Created
  16  *      18-Oct-2004 BJD  Cleanups, and added code to report OC cleared
  17  *      09-Aug-2005 BJD  Renamed s3c2410_report_oc to s3c2410_usb_report_oc
  18  *      09-Aug-2005 BJD  Ports powered only if both are enabled
  19 */
  20
  21 #define DEBUG
  22
  23 #include <linux/kernel.h>
  24 #include <linux/types.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/list.h>
  27 #include <linux/timer.h>
  28 #include <linux/init.h>
  29 #include <linux/device.h>
  30
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/map.h>
  33 #include <asm/mach/irq.h>
  34
  35 #include <asm/arch/bast-map.h>
  36 #include <asm/arch/bast-irq.h>
  37 #include <asm/arch/usb-control.h>
  38 #include <asm/arch/regs-gpio.h>
  39
  40 #include <asm/hardware.h>
  41 #include <asm/io.h>
  42 #include <asm/irq.h>
  43
  44 #include "devs.h"
  45 #include "usb-simtec.h"
  46
  47 /* control power and monitor over-current events on various Simtec
  48  * designed boards.
  49 */
  50
  51 static unsigned int power_state[2];
  52
  53 static void
  54 usb_simtec_powercontrol(int port, int to)
  55 {
  56         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
  57
  58         power_state[port] = to;
  59
  60         if (power_state[0] && power_state[1])
  61                 s3c2410_gpio_setpin(S3C2410_GPB4, 0);
  62         else
  63                 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
  64 }
  65
  66 static irqreturn_t
  67 usb_simtec_ocirq(int irq, void *pw, struct pt_regs *regs)
  68 {
  69         struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
  70
  71         if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
  72                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
  73                 s3c2410_usb_report_oc(info, 3);
  74         } else {
  75                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
  76                 s3c2410_usb_report_oc(info, 0);
  77         }
  78
  79         return IRQ_HANDLED;
  80 }
  81
  82 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
  83 {
  84         int ret;
  85
  86         if (on) {
  87                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
  88                                   SA_INTERRUPT | SA_TRIGGER_RISING |
  89                                    SA_TRIGGER_FALLING,
  90                                   "USB Over-current", info);
  91                 if (ret != 0) {
  92                         printk(KERN_ERR "failed to request usb oc irq\n");
  93                 }
  94         } else {
  95                 free_irq(IRQ_USBOC, info);
  96         }
  97 }
  98
  99 static struct s3c2410_hcd_info usb_simtec_info = {
 100         .port[0]        = {
 101                 .flags  = S3C_HCDFLG_USED
 102         },
 103         .port[1]        = {
 104                 .flags  = S3C_HCDFLG_USED
 105         },
 106
 107         .power_control  = usb_simtec_powercontrol,
 108         .enable_oc      = usb_simtec_enableoc,
 109 };
 110
 111
 112 int usb_simtec_init(void)
 113 {
 114         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
 115         s3c_device_usb.dev.platform_data = &usb_simtec_info;
 116
 117         s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
 118         s3c2410_gpio_setpin(S3C2410_GPB4, 1);
 119         return 0;
 120 }