arch/arm/mach-s3c24xx/simtec-usb.c

   1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
   2  *
   3  * Copyright 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/hardware.h>
  32 #include <mach/gpio-samsung.h>
  33 #include <asm/irq.h>
  34
  35 #include <linux/platform_data/usb-ohci-s3c2410.h>
  36 #include <plat/devs.h>
  37
  38 #include "bast.h"
  39 #include "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                 gpio_set_value(S3C2410_GPB(4), 0);
  56         else
  57                 gpio_set_value(S3C2410_GPB(4), 1);
  58 }
  59
  60 static irqreturn_t
  61 usb_simtec_ocirq(int irq, void *pw)
  62 {
  63         struct s3c2410_hcd_info *info = pw;
  64
  65         if (gpio_get_value(S3C2410_GPG(10)) == 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(BAST_IRQ_USBOC, usb_simtec_ocirq,
  82                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  83                                   "USB Over-current", info);
  84                 if (ret != 0) {
  85                         printk(KERN_ERR "failed to request usb oc irq\n");
  86                 }
  87         } else {
  88                 free_irq(BAST_IRQ_USBOC, info);
  89         }
  90 }
  91
  92 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
  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 __init usb_simtec_init(void)
 106 {
 107         int ret;
 108
 109         printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
 110
 111         ret = gpio_request(S3C2410_GPB(4), "USB power control");
 112         if (ret < 0) {
 113                 pr_err("%s: failed to get GPB4\n", __func__);
 114                 return ret;
 115         }
 116
 117         ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
 118         if (ret < 0) {
 119                 pr_err("%s: failed to get GPG10\n", __func__);
 120                 gpio_free(S3C2410_GPB(4));
 121                 return ret;
 122         }
 123
 124         /* turn power on */
 125         gpio_direction_output(S3C2410_GPB(4), 1);
 126         gpio_direction_input(S3C2410_GPG(10));
 127
 128         s3c_ohci_set_platdata(&usb_simtec_info);
 129         return 0;
 130 }