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

   1 --- /dev/null
   2 +++ b/drivers/watchdog/ar2315-wtd.c
   3 @@ -0,0 +1,186 @@
   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 +}
  56 +
  57 +static ssize_t
  58 +ar2315_wdt_write(struct file *file, const char __user *data, size_t len,
  59 +                loff_t *ppos)
  60 +{
  61 +       if (len)
  62 +               ar2315_wdt_enable();
  63 +       return len;
  64 +}
  65 +
  66 +static int
  67 +ar2315_wdt_open(struct inode *inode, struct file *file)
  68 +{
  69 +       if (in_use)
  70 +               return -EBUSY;
  71 +       ar2315_wdt_enable();
  72 +       in_use = started = 1;
  73 +       return nonseekable_open(inode, file);
  74 +}
  75 +
  76 +static int
  77 +ar2315_wdt_release(struct inode *inode, struct file *file)
  78 +{
  79 +       in_use = 0;
  80 +       return 0;
  81 +}
  82 +
  83 +static irqreturn_t
  84 +ar2315_wdt_interrupt(int irq, void *dev)
  85 +{
  86 +       struct platform_device *pdev = (struct platform_device *)dev;
  87 +
  88 +       if (started) {
  89 +               dev_crit(&pdev->dev, "watchdog expired, rebooting system\n");
  90 +               emergency_restart();
  91 +       } else {
  92 +               ar231x_write_reg(AR2315_WDC, 0);
  93 +               ar231x_write_reg(AR2315_WD, 0);
  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 +       ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt,
 153 +                         IRQF_DISABLED, DRIVER_NAME, dev);
 154 +       if (ret) {
 155 +               dev_err(&dev->dev, "failed to register inetrrupt\n");
 156 +               goto out;
 157 +       }
 158 +
 159 +       ret = misc_register(&ar2315_wdt_miscdev);
 160 +       if (ret)
 161 +               dev_err(&dev->dev, "failed to register miscdev\n");
 162 +
 163 +out:
 164 +       return ret;
 165 +}
 166 +
 167 +static int
 168 +ar2315_wdt_remove(struct platform_device *dev)
 169 +{
 170 +       misc_deregister(&ar2315_wdt_miscdev);
 171 +       free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
 172 +       return 0;
 173 +}
 174 +
 175 +static struct platform_driver ar2315_wdt_driver = {
 176 +       .probe = ar2315_wdt_probe,
 177 +       .remove = ar2315_wdt_remove,
 178 +       .driver = {
 179 +               .name = DRIVER_NAME,
 180 +               .owner = THIS_MODULE,
 181 +       },
 182 +};
 183 +
 184 +module_platform_driver(ar2315_wdt_driver);
 185 +
 186 +MODULE_DESCRIPTION("Atheros AR2315 hardware watchdog driver");
 187 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 188 +MODULE_LICENSE("GPL");
 189 +MODULE_ALIAS("platform:" DRIVER_NAME);
 190 --- a/drivers/watchdog/Kconfig
 191 +++ b/drivers/watchdog/Kconfig
 192 @@ -1113,6 +1113,13 @@ config LANTIQ_WDT
 193         help
 194           Hardware driver for the Lantiq SoC Watchdog Timer.
 195
 196 +config AR2315_WDT
 197 +       tristate "Atheros AR2315+ WiSoCs Watchdog Timer"
 198 +       depends on ATHEROS_AR231X
 199 +       help
 200 +         Hardware driver for the built-in watchdog timer on the Atheros
 201 +         AR2315/AR2316 WiSoCs.
 202 +
 203  # PARISC Architecture
 204
 205  # POWERPC Architecture
 206 --- a/drivers/watchdog/Makefile
 207 +++ b/drivers/watchdog/Makefile
 208 @@ -131,6 +131,7 @@ obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
 209  obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
 210  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 211  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 212 +obj-$(CONFIG_AR2315_WDT) += ar2315-wtd.o
 213  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
 214  obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
 215  octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o