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

   1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
   2  *
   3  * Copyright (c) 2004 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 */
  18
  19 #define DEBUG
  20
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/list.h>
  25 #include <linux/timer.h>
  26 #include <linux/init.h>
  27 #include <linux/device.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31 #include <asm/mach/irq.h>
  32
  33 #include <asm/arch/bast-map.h>
  34 #include <asm/arch/bast-irq.h>
  35 #include <asm/arch/usb-control.h>
  36 #include <asm/arch/regs-gpio.h>
  37
  38 #include <asm/hardware.h>
  39 #include <asm/io.h>
  40 #include <asm/irq.h>
  41 #include <asm/mach-types.h>
  42
  43 #include "devs.h"
  44 #include "usb-simtec.h"
  45
  46 /* control power and monitor over-current events on various Simtec
  47  * designed boards.
  48 */
  49
  50 static void
  51 usb_simtec_powercontrol(int port, int to)
  52 {
  53         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
  54
  55         if (port == 1)
  56                 s3c2410_gpio_setpin(S3C2410_GPB4, to ? 0:1);
  57 }
  58
  59 static irqreturn_t
  60 usb_simtec_ocirq(int irq, void *pw, struct pt_regs *regs)
  61 {
  62         struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
  63
  64         if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
  65                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
  66                 s3c2410_report_oc(info, 3);
  67         } else {
  68                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
  69                 s3c2410_report_oc(info, 0);
  70         }
  71
  72         return IRQ_HANDLED;
  73 }
  74
  75 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
  76 {
  77         int ret;
  78
  79         if (on) {
  80                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq, SA_INTERRUPT,
  81                                   "USB Over-current", info);
  82                 if (ret != 0) {
  83                         printk(KERN_ERR "failed to request usb oc irq\n");
  84                 }
  85
  86                 set_irq_type(IRQ_USBOC, IRQT_BOTHEDGE);
  87         } else {
  88                 free_irq(IRQ_USBOC, info);
  89         }
  90 }
  91
  92 static struct s3c2410_hcd_info usb_simtec_info = {
  93         .port[0]        = {
  94                 .flags  = S3C_HCDFLG_USED
  95         },
  96         .port[1]        = {
  97                 .flags  = S3C_HCDFLG_USED
  98         },
  99
 100         .power_control  = usb_simtec_powercontrol,
 101         .enable_oc      = usb_simtec_enableoc,
 102 };
 103
 104
 105 int usb_simtec_init(void)
 106 {
 107         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
 108         s3c_device_usb.dev.platform_data = &usb_simtec_info;
 109
 110         s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
 111         s3c2410_gpio_setpin(S3C2410_GPB4, 1);
 112         return 0;
 113 }