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

   1 --- /dev/null
   2 +++ b/drivers/watchdog/ar2315-wtd.c
   3 @@ -0,0 +1,189 @@
   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 DRIVER_NAME    "ar2315-wdt"
  43 +
  44 +#define CLOCK_RATE 40000000
  45 +#define HEARTBEAT(x) (x < 1 || x > 90 ? 20 : x)
  46 +
  47 +static int wdt_timeout = 20;
  48 +static int started;
  49 +static int in_use;
  50 +
  51 +static void
  52 +ar2315_wdt_enable(void)
  53 +{
  54 +       ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
  55 +       ar231x_write_reg(AR2315_ISR, 0x80);
  56 +}
  57 +
  58 +static ssize_t
  59 +ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
  60 +                loff_t *ppos)
  61 +{
  62 +       if (len)
  63 +               ar2315_wdt_enable();
  64 +       return len;
  65 +}
  66 +
  67 +static int
  68 +ar2315_wdt_open(struct inode *inode, struct file *file)
  69 +{
  70 +       if (in_use)
  71 +               return -EBUSY;
  72 +       ar2315_wdt_enable();
  73 +       in_use = started = 1;
  74 +       return nonseekable_open(inode, file);
  75 +}
  76 +
  77 +static int
  78 +ar2315_wdt_release(struct inode *inode, struct file *file)
  79 +{
  80 +       in_use = 0;
  81 +       return 0;
  82 +}
  83 +
  84 +static irqreturn_t
  85 +ar2315_wdt_interrupt(int irq, void *dev)
  86 +{
  87 +       struct platform_device *pdev = (struct platform_device *)dev;
  88 +
  89 +       if (started) {
  90 +               dev_crit(&pdev->dev, "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 long
 106 +ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 107 +{
 108 +       int new_wdt_timeout;
 109 +       int ret = -ENOIOCTLCMD;
 110 +
 111 +       switch (cmd) {
 112 +       case WDIOC_GETSUPPORT:
 113 +               ret = copy_to_user((void __user *)arg, &ident, sizeof(ident)) ?
 114 +                     -EFAULT : 0;
 115 +               break;
 116 +       case WDIOC_KEEPALIVE:
 117 +               ar2315_wdt_enable();
 118 +               ret = 0;
 119 +               break;
 120 +       case WDIOC_SETTIMEOUT:
 121 +               ret = get_user(new_wdt_timeout, (int __user *)arg);
 122 +               if (ret)
 123 +                       break;
 124 +               wdt_timeout = HEARTBEAT(new_wdt_timeout);
 125 +               ar2315_wdt_enable();
 126 +               break;
 127 +       case WDIOC_GETTIMEOUT:
 128 +               ret = put_user(wdt_timeout, (int __user *)arg);
 129 +               break;
 130 +       }
 131 +       return ret;
 132 +}
 133 +
 134 +static const struct file_operations ar2315_wdt_fops = {
 135 +       .owner          = THIS_MODULE,
 136 +       .llseek         = no_llseek,
 137 +       .write          = ar2315_wdt_write,
 138 +       .unlocked_ioctl = ar2315_wdt_ioctl,
 139 +       .open           = ar2315_wdt_open,
 140 +       .release        = ar2315_wdt_release,
 141 +};
 142 +
 143 +static struct miscdevice ar2315_wdt_miscdev = {
 144 +       .minor  = WATCHDOG_MINOR,
 145 +       .name   = "watchdog",
 146 +       .fops   = &ar2315_wdt_fops,
 147 +};
 148 +
 149 +static int
 150 +ar2315_wdt_probe(struct platform_device *dev)
 151 +{
 152 +       int ret = 0;
 153 +
 154 +       ar2315_wdt_enable();
 155 +       ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt,
 156 +                         IRQF_DISABLED, DRIVER_NAME, dev);
 157 +       if (ret) {
 158 +               dev_err(&dev->dev, "failed to register inetrrupt\n");
 159 +               goto out;
 160 +       }
 161 +
 162 +       ret = misc_register(&ar2315_wdt_miscdev);
 163 +       if (ret)
 164 +               dev_err(&dev->dev, "failed to register miscdev\n");
 165 +
 166 +out:
 167 +       return ret;
 168 +}
 169 +
 170 +static int
 171 +ar2315_wdt_remove(struct platform_device *dev)
 172 +{
 173 +       misc_deregister(&ar2315_wdt_miscdev);
 174 +       free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
 175 +       return 0;
 176 +}
 177 +
 178 +static struct platform_driver ar2315_wdt_driver = {
 179 +       .probe = ar2315_wdt_probe,
 180 +       .remove = ar2315_wdt_remove,
 181 +       .driver = {
 182 +               .name = DRIVER_NAME,
 183 +               .owner = THIS_MODULE,
 184 +       },
 185 +};
 186 +
 187 +module_platform_driver(ar2315_wdt_driver);
 188 +
 189 +MODULE_DESCRIPTION("Atheros AR2315 hardware watchdog driver");
 190 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 191 +MODULE_LICENSE("GPL");
 192 +MODULE_ALIAS("platform:" DRIVER_NAME);
 193 --- a/drivers/watchdog/Kconfig
 194 +++ b/drivers/watchdog/Kconfig
 195 @@ -1113,6 +1113,12 @@ config LANTIQ_WDT
 196         help
 197           Hardware driver for the Lantiq SoC Watchdog Timer.
 198
 199 +config ATHEROS_WDT
 200 +       tristate "Atheros wisoc Watchdog Timer"
 201 +       depends on ATHEROS_AR231X
 202 +       help
 203 +         Hardware driver for the Atheros wisoc Watchdog Timer.
 204 +
 205  # PARISC Architecture
 206
 207  # POWERPC Architecture
 208 --- a/drivers/watchdog/Makefile
 209 +++ b/drivers/watchdog/Makefile
 210 @@ -131,6 +131,7 @@ obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
 211  obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
 212  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 213  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 214 +obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
 215  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
 216  obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
 217  octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o