target/linux/atheros/patches-2.6.32/130-watchdog.patch

   1 Index: linux-2.6.32.7/drivers/watchdog/ar2315-wtd.c
   2 ===================================================================
   3 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
   4 +++ linux-2.6.32.7/drivers/watchdog/ar2315-wtd.c        2010-02-03 17:01:46.074429108 +0100
   5 @@ -0,0 +1,200 @@
   6 +/*
   7 + * This program is free software; you can redistribute it and/or modify
   8 + * it under the terms of the GNU General Public License as published by
   9 + * the Free Software Foundation; either version 2 of the License, or
  10 + * (at your option) any later version.
  11 + *
  12 + * This program is distributed in the hope that it will be useful,
  13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 + * GNU General Public License for more details.
  16 + *
  17 + * You should have received a copy of the GNU General Public License
  18 + * along with this program; if not, write to the Free Software
  19 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 + *
  21 + * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  22 + * Based on EP93xx and ifxmips wdt driver
  23 + */
  24 +
  25 +#include <linux/interrupt.h>
  26 +#include <linux/module.h>
  27 +#include <linux/moduleparam.h>
  28 +#include <linux/types.h>
  29 +#include <linux/miscdevice.h>
  30 +#include <linux/watchdog.h>
  31 +#include <linux/fs.h>
  32 +#include <linux/ioport.h>
  33 +#include <linux/notifier.h>
  34 +#include <linux/reboot.h>
  35 +#include <linux/init.h>
  36 +#include <linux/platform_device.h>
  37 +
  38 +#include <asm/io.h>
  39 +#include <asm/uaccess.h>
  40 +#include <asm/system.h>
  41 +#include <asm/addrspace.h>
  42 +#include <ar231x_platform.h>
  43 +#include <ar2315_regs.h>
  44 +#include <ar231x.h>
  45 +
  46 +#define CLOCK_RATE 40000000
  47 +#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x)
  48 +
  49 +static int wdt_timeout = 20;
  50 +static int started = 0;
  51 +static int in_use = 0;
  52 +
  53 +static void
  54 +ar2315_wdt_enable(void)
  55 +{
  56 +       ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
  57 +       ar231x_write_reg(AR2315_ISR, 0x80);
  58 +}
  59 +
  60 +static ssize_t
  61 +ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
  62 +{
  63 +       if(len)
  64 +               ar2315_wdt_enable();
  65 +       return len;
  66 +}
  67 +
  68 +static int
  69 +ar2315_wdt_open(struct inode *inode, struct file *file)
  70 +{
  71 +       if(in_use)
  72 +               return -EBUSY;
  73 +       ar2315_wdt_enable();
  74 +       in_use = started = 1;
  75 +       return nonseekable_open(inode, file);
  76 +}
  77 +
  78 +static int
  79 +ar2315_wdt_release(struct inode *inode, struct file *file)
  80 +{
  81 +       in_use = 0;
  82 +       return 0;
  83 +}
  84 +
  85 +static irqreturn_t
  86 +ar2315_wdt_interrupt(int irq, void *dev_id)
  87 +{
  88 +       if(started)
  89 +       {
  90 +               printk(KERN_CRIT "watchdog expired, rebooting system\n");
  91 +               emergency_restart();
  92 +       } else {
  93 +               ar231x_write_reg(AR2315_WDC, 0);
  94 +               ar231x_write_reg(AR2315_WD, 0);
  95 +               ar231x_write_reg(AR2315_ISR, 0x80);
  96 +       }
  97 +       return IRQ_HANDLED;
  98 +}
  99 +
 100 +static struct watchdog_info ident = {
 101 +       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
 102 +       .identity = "ar2315 Watchdog",
 103 +};
 104 +
 105 +static int
 106 +ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 107 +{
 108 +       int new_wdt_timeout;
 109 +       int ret = -ENOIOCTLCMD;
 110 +
 111 +       switch(cmd)
 112 +       {
 113 +               case WDIOC_GETSUPPORT:
 114 +                       ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
 115 +                       break;
 116 +
 117 +               case WDIOC_KEEPALIVE:
 118 +                       ar2315_wdt_enable();
 119 +                       ret = 0;
 120 +                       break;
 121 +
 122 +               case WDIOC_SETTIMEOUT:
 123 +                       if((ret = get_user(new_wdt_timeout, (int __user *)arg)))
 124 +                               break;
 125 +                       wdt_timeout = HEARTBEAT(new_wdt_timeout);
 126 +                       ar2315_wdt_enable();
 127 +                       break;
 128 +
 129 +               case WDIOC_GETTIMEOUT:
 130 +                       ret = put_user(wdt_timeout, (int __user *)arg);
 131 +                       break;
 132 +       }
 133 +       return ret;
 134 +}
 135 +
 136 +static struct file_operations ar2315_wdt_fops = {
 137 +       .owner          = THIS_MODULE,
 138 +       .llseek         = no_llseek,
 139 +       .write          = ar2315_wdt_write,
 140 +       .ioctl          = ar2315_wdt_ioctl,
 141 +       .open           = ar2315_wdt_open,
 142 +       .release        = ar2315_wdt_release,
 143 +};
 144 +
 145 +static struct miscdevice ar2315_wdt_miscdev = {
 146 +       .minor  = WATCHDOG_MINOR,
 147 +       .name   = "watchdog",
 148 +       .fops   = &ar2315_wdt_fops,
 149 +};
 150 +
 151 +static int
 152 +ar2315_wdt_probe(struct platform_device *dev)
 153 +{
 154 +       int ret = 0;
 155 +
 156 +       ar2315_wdt_enable();
 157 +       ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL);
 158 +       if(ret)
 159 +       {
 160 +               printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n");
 161 +               goto out;
 162 +       }
 163 +
 164 +       ret = misc_register(&ar2315_wdt_miscdev);
 165 +       if(ret)
 166 +               printk(KERN_ERR "ar2315wdt: failed to register miscdev\n");
 167 +
 168 +out:
 169 +       return ret;
 170 +}
 171 +
 172 +static int
 173 +ar2315_wdt_remove(struct platform_device *dev)
 174 +{
 175 +       misc_deregister(&ar2315_wdt_miscdev);
 176 +       free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
 177 +       return 0;
 178 +}
 179 +
 180 +static struct platform_driver ar2315_wdt_driver = {
 181 +       .probe = ar2315_wdt_probe,
 182 +       .remove = ar2315_wdt_remove,
 183 +       .driver = {
 184 +               .name = "ar2315_wdt",
 185 +               .owner = THIS_MODULE,
 186 +       },
 187 +};
 188 +
 189 +static int __init
 190 +init_ar2315_wdt(void)
 191 +{
 192 +       int ret = platform_driver_register(&ar2315_wdt_driver);
 193 +       if(ret)
 194 +               printk(KERN_INFO "ar2315_wdt: error registering platfom driver!");
 195 +       return ret;
 196 +}
 197 +
 198 +static void __exit
 199 +exit_ar2315_wdt(void)
 200 +{
 201 +       platform_driver_unregister(&ar2315_wdt_driver);
 202 +}
 203 +
 204 +module_init(init_ar2315_wdt);
 205 +module_exit(exit_ar2315_wdt);
 206 Index: linux-2.6.32.7/drivers/watchdog/Kconfig
 207 ===================================================================
 208 --- linux-2.6.32.7.orig/drivers/watchdog/Kconfig        2010-01-29 00:06:20.000000000 +0100
 209 +++ linux-2.6.32.7/drivers/watchdog/Kconfig     2010-02-03 17:01:46.078429135 +0100
 210 @@ -850,6 +850,12 @@
 211         help
 212           Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
 213
 214 +config ATHEROS_WDT
 215 +       tristate "Atheros wisoc Watchdog Timer"
 216 +       depends on ATHEROS_AR231X
 217 +       help
 218 +         Hardware driver for the Atheros wisoc Watchdog Timer.
 219 +
 220  # PARISC Architecture
 221
 222  # POWERPC Architecture
 223 Index: linux-2.6.32.7/drivers/watchdog/Makefile
 224 ===================================================================
 225 --- linux-2.6.32.7.orig/drivers/watchdog/Makefile       2010-01-29 00:06:20.000000000 +0100
 226 +++ linux-2.6.32.7/drivers/watchdog/Makefile    2010-02-03 17:01:46.078429135 +0100
 227 @@ -113,6 +113,7 @@
 228  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 229  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 230  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
 231 +obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
 232
 233  # PARISC Architecture
 234