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

   1 // SPDX-License-Identifier: GPL-2.0
   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 #define DEBUG
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/list.h>
  16 #include <linux/gpio.h>
  17 #include <linux/timer.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/io.h>
  21
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/map.h>
  24 #include <asm/mach/irq.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/gpio-samsung.h>
  28 #include <asm/irq.h>
  29
  30 #include <linux/platform_data/usb-ohci-s3c2410.h>
  31 #include <plat/devs.h>
  32
  33 #include "bast.h"
  34 #include "simtec.h"
  35
  36 /* control power and monitor over-current events on various Simtec
  37  * designed boards.
  38 */
  39
  40 static unsigned int power_state[2];
  41
  42 static void
  43 usb_simtec_powercontrol(int port, int to)
  44 {
  45         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
  46
  47         power_state[port] = to;
  48
  49         if (power_state[0] && power_state[1])
  50                 gpio_set_value(S3C2410_GPB(4), 0);
  51         else
  52                 gpio_set_value(S3C2410_GPB(4), 1);
  53 }
  54
  55 static irqreturn_t
  56 usb_simtec_ocirq(int irq, void *pw)
  57 {
  58         struct s3c2410_hcd_info *info = pw;
  59
  60         if (gpio_get_value(S3C2410_GPG(10)) == 0) {
  61                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
  62                 s3c2410_usb_report_oc(info, 3);
  63         } else {
  64                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
  65                 s3c2410_usb_report_oc(info, 0);
  66         }
  67
  68         return IRQ_HANDLED;
  69 }
  70
  71 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
  72 {
  73         int ret;
  74
  75         if (on) {
  76                 ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
  77                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  78                                   "USB Over-current", info);
  79                 if (ret != 0) {
  80                         printk(KERN_ERR "failed to request usb oc irq\n");
  81                 }
  82         } else {
  83                 free_irq(BAST_IRQ_USBOC, info);
  84         }
  85 }
  86
  87 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
  88         .port[0]        = {
  89                 .flags  = S3C_HCDFLG_USED
  90         },
  91         .port[1]        = {
  92                 .flags  = S3C_HCDFLG_USED
  93         },
  94
  95         .power_control  = usb_simtec_powercontrol,
  96         .enable_oc      = usb_simtec_enableoc,
  97 };
  98
  99
 100 int __init usb_simtec_init(void)
 101 {
 102         int ret;
 103
 104         printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
 105
 106         ret = gpio_request(S3C2410_GPB(4), "USB power control");
 107         if (ret < 0) {
 108                 pr_err("%s: failed to get GPB4\n", __func__);
 109                 return ret;
 110         }
 111
 112         ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
 113         if (ret < 0) {
 114                 pr_err("%s: failed to get GPG10\n", __func__);
 115                 gpio_free(S3C2410_GPB(4));
 116                 return ret;
 117         }
 118
 119         /* turn power on */
 120         gpio_direction_output(S3C2410_GPB(4), 1);
 121         gpio_direction_input(S3C2410_GPG(10));
 122
 123         s3c_ohci_set_platdata(&usb_simtec_info);
 124         return 0;
 125 }