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 */
  17
  18 #define DEBUG
  19
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/list.h>
  24 #include <linux/timer.h>
  25 #include <linux/init.h>
  26 #include <linux/device.h>
  27
  28 #include <asm/mach/arch.h>
  29 #include <asm/mach/map.h>
  30 #include <asm/mach/irq.h>
  31
  32 #include <asm/arch/bast-map.h>
  33 #include <asm/arch/bast-irq.h>
  34 #include <asm/arch/usb-control.h>
  35 #include <asm/arch/regs-gpio.h>
  36
  37 #include <asm/hardware.h>
  38 #include <asm/io.h>
  39 #include <asm/irq.h>
  40 #include <asm/mach-types.h>
  41
  42 #include "devs.h"
  43 #include "usb-simtec.h"
  44
  45 /* control power and monitor over-current events on various Simtec
  46  * designed boards.
  47 */
  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         if (port == 1) {
  55                 s3c2410_gpio_setpin(S3C2410_GPB4, to ? 0:1);
  56                 pr_debug("GPBDAT now %08x\n", __raw_readl(S3C2410_GPBDAT));
  57         }
  58 }
  59
  60 static irqreturn_t
  61 usb_simtec_ocirq(int irq, void *pw, struct pt_regs *regs)
  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_report_oc(info, 3);
  68         } else {
  69                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
  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                 pr_debug("claiming usb overccurent\n");
  81                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq, SA_INTERRUPT,
  82                                   "usb-oc", info);
  83                 if (ret != 0) {
  84                         printk(KERN_ERR "failed to request usb oc irq\n");
  85                 }
  86
  87                 set_irq_type(IRQ_USBOC, IRQT_BOTHEDGE);
  88         } else {
  89                 free_irq(IRQ_USBOC, NULL);
  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
 114         pr_debug("GPB: CON=%08x, DAT=%08x\n",
 115                  __raw_readl(S3C2410_GPBCON), __raw_readl(S3C2410_GPBDAT));
 116
 117         if (0) {
 118                 s3c2410_modify_misccr(S3C2410_MISCCR_USBHOST,
 119                                       S3C2410_MISCCR_USBDEV);
 120         }
 121
 122         return 0;
 123 }