target/linux/atheros/patches-3.10/130-watchdog.patch

   1 --- /dev/null
   2 +++ b/drivers/watchdog/ar2315-wtd.c
   3 @@ -0,0 +1,198 @@
   4 +/*
   5 + * This program is free software; you can redistribute it and/or modify
   6 + * it under the terms of the GNU General Public License as published by
   7 + * the Free Software Foundation; either version 2 of the License, or
   8 + * (at your option) any later version.
   9 + *
  10 + * This program is distributed in the hope that it will be useful,
  11 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 + * GNU General Public License for more details.
  14 + *
  15 + * You should have received a copy of the GNU General Public License
  16 + * along with this program; if not, write to the Free Software
  17 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 + *
  19 + * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  20 + * Based on EP93xx and ifxmips wdt driver
  21 + */
  22 +
  23 +#include <linux/interrupt.h>
  24 +#include <linux/module.h>
  25 +#include <linux/moduleparam.h>
  26 +#include <linux/types.h>
  27 +#include <linux/miscdevice.h>
  28 +#include <linux/watchdog.h>
  29 +#include <linux/fs.h>
  30 +#include <linux/ioport.h>
  31 +#include <linux/notifier.h>
  32 +#include <linux/reboot.h>
  33 +#include <linux/init.h>
  34 +#include <linux/platform_device.h>
  35 +#include <linux/io.h>
  36 +#include <linux/uaccess.h>
  37 +
  38 +#include <ar231x_platform.h>
  39 +#include <ar2315_regs.h>
  40 +#include <ar231x.h>
  41 +
  42 +#define CLOCK_RATE 40000000
  43 +#define HEARTBEAT(x) (x < 1 || x > 90 ? 20 : x)
  44 +
  45 +static int wdt_timeout = 20;
  46 +static int started;
  47 +static int in_use;
  48 +
  49 +static void
  50 +ar2315_wdt_enable(void)
  51 +{
  52 +       ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
  53 +       ar231x_write_reg(AR2315_ISR, 0x80);
  54 +}
  55 +
  56 +static ssize_t
  57 +ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
  58 +                loff_t *ppos)
  59 +{
  60 +       if (len)
  61 +               ar2315_wdt_enable();
  62 +       return len;
  63 +}
  64 +
  65 +static int
  66 +ar2315_wdt_open(struct inode *inode, struct file *file)
  67 +{
  68 +       if (in_use)
  69 +               return -EBUSY;
  70 +       ar2315_wdt_enable();
  71 +       in_use = started = 1;
  72 +       return nonseekable_open(inode, file);
  73 +}
  74 +
  75 +static int
  76 +ar2315_wdt_release(struct inode *inode, struct file *file)
  77 +{
  78 +       in_use = 0;
  79 +       return 0;
  80 +}
  81 +
  82 +static irqreturn_t
  83 +ar2315_wdt_interrupt(int irq, void *dev)
  84 +{
  85 +       struct platform_device *pdev = (struct platform_device *)dev;
  86 +
  87 +       if (started) {
  88 +               dev_crit(&pdev->dev, "watchdog expired, rebooting system\n");
  89 +               emergency_restart();
  90 +       } else {
  91 +               ar231x_write_reg(AR2315_WDC, 0);
  92 +               ar231x_write_reg(AR2315_WD, 0);
  93 +               ar231x_write_reg(AR2315_ISR, 0x80);
  94 +       }
  95 +       return IRQ_HANDLED;
  96 +}
  97 +
  98 +static struct watchdog_info ident = {
  99 +       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
 100 +       .identity = "ar2315 Watchdog",
 101 +};
 102 +
 103 +static long
 104 +ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 105 +{
 106 +       int new_wdt_timeout;
 107 +       int ret = -ENOIOCTLCMD;
 108 +
 109 +       switch (cmd) {
 110 +       case WDIOC_GETSUPPORT:
 111 +               ret = copy_to_user((void __user *)arg, &ident, sizeof(ident)) ?
 112 +                     -EFAULT : 0;
 113 +               break;
 114 +       case WDIOC_KEEPALIVE:
 115 +               ar2315_wdt_enable();
 116 +               ret = 0;
 117 +               break;
 118 +       case WDIOC_SETTIMEOUT:
 119 +               ret = get_user(new_wdt_timeout, (int __user *)arg);
 120 +               if (ret)
 121 +                       break;
 122 +               wdt_timeout = HEARTBEAT(new_wdt_timeout);
 123 +               ar2315_wdt_enable();
 124 +               break;
 125 +       case WDIOC_GETTIMEOUT:
 126 +               ret = put_user(wdt_timeout, (int __user *)arg);
 127 +               break;
 128 +       }
 129 +       return ret;
 130 +}
 131 +
 132 +static const struct file_operations ar2315_wdt_fops = {
 133 +       .owner          = THIS_MODULE,
 134 +       .llseek         = no_llseek,
 135 +       .write          = ar2315_wdt_write,
 136 +       .unlocked_ioctl = ar2315_wdt_ioctl,
 137 +       .open           = ar2315_wdt_open,
 138 +       .release        = ar2315_wdt_release,
 139 +};
 140 +
 141 +static struct miscdevice ar2315_wdt_miscdev = {
 142 +       .minor  = WATCHDOG_MINOR,
 143 +       .name   = "watchdog",
 144 +       .fops   = &ar2315_wdt_fops,
 145 +};
 146 +
 147 +static int
 148 +ar2315_wdt_probe(struct platform_device *dev)
 149 +{
 150 +       int ret = 0;
 151 +
 152 +       ar2315_wdt_enable();
 153 +       ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt,
 154 +                         IRQF_DISABLED, "ar2315_wdt", dev);
 155 +       if (ret) {
 156 +               dev_err(&dev->dev, "failed to register inetrrupt\n");
 157 +               goto out;
 158 +       }
 159 +
 160 +       ret = misc_register(&ar2315_wdt_miscdev);
 161 +       if (ret)
 162 +               dev_err(&dev->dev, "failed to register miscdev\n");
 163 +
 164 +out:
 165 +       return ret;
 166 +}
 167 +
 168 +static int
 169 +ar2315_wdt_remove(struct platform_device *dev)
 170 +{
 171 +       misc_deregister(&ar2315_wdt_miscdev);
 172 +       free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
 173 +       return 0;
 174 +}
 175 +
 176 +static struct platform_driver ar2315_wdt_driver = {
 177 +       .probe = ar2315_wdt_probe,
 178 +       .remove = ar2315_wdt_remove,
 179 +       .driver = {
 180 +               .name = "ar2315_wdt",
 181 +               .owner = THIS_MODULE,
 182 +       },
 183 +};
 184 +
 185 +static int __init
 186 +init_ar2315_wdt(void)
 187 +{
 188 +       int ret = platform_driver_register(&ar2315_wdt_driver);
 189 +       if (ret)
 190 +               pr_err("ar2315_wdt: error registering platfom driver!\n");
 191 +       return ret;
 192 +}
 193 +
 194 +static void __exit
 195 +exit_ar2315_wdt(void)
 196 +{
 197 +       platform_driver_unregister(&ar2315_wdt_driver);
 198 +}
 199 +
 200 +module_init(init_ar2315_wdt);
 201 +module_exit(exit_ar2315_wdt);
 202 --- a/drivers/watchdog/Kconfig
 203 +++ b/drivers/watchdog/Kconfig
 204 @@ -1113,6 +1113,12 @@ config LANTIQ_WDT
 205         help
 206           Hardware driver for the Lantiq SoC Watchdog Timer.
 207
 208 +config ATHEROS_WDT
 209 +       tristate "Atheros wisoc Watchdog Timer"
 210 +       depends on ATHEROS_AR231X
 211 +       help
 212 +         Hardware driver for the Atheros wisoc Watchdog Timer.
 213 +
 214  # PARISC Architecture
 215
 216  # POWERPC Architecture
 217 --- a/drivers/watchdog/Makefile
 218 +++ b/drivers/watchdog/Makefile
 219 @@ -131,6 +131,7 @@ obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
 220  obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
 221  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 222  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 223 +obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
 224  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
 225  obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
 226  octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o