--- /dev/null +++ b/drivers/watchdog/ar2315-wtd.c @@ -0,0 +1,200 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (C) 2008 John Crispin + * Based on EP93xx and ifxmips wdt driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#define CLOCK_RATE 40000000 +#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x) + +static int wdt_timeout = 20; +static int started = 0; +static int in_use = 0; + +static void +ar2315_wdt_enable(void) +{ + ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE); + ar231x_write_reg(AR2315_ISR, 0x80); +} + +static ssize_t +ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) +{ + if(len) + ar2315_wdt_enable(); + return len; +} + +static int +ar2315_wdt_open(struct inode *inode, struct file *file) +{ + if(in_use) + return -EBUSY; + ar2315_wdt_enable(); + in_use = started = 1; + return nonseekable_open(inode, file); +} + +static int +ar2315_wdt_release(struct inode *inode, struct file *file) +{ + in_use = 0; + return 0; +} + +static irqreturn_t +ar2315_wdt_interrupt(int irq, void *dev_id) +{ + if(started) + { + printk(KERN_CRIT "watchdog expired, rebooting system\n"); + emergency_restart(); + } else { + ar231x_write_reg(AR2315_WDC, 0); + ar231x_write_reg(AR2315_WD, 0); + ar231x_write_reg(AR2315_ISR, 0x80); + } + return IRQ_HANDLED; +} + +static struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = "ar2315 Watchdog", +}; + +static int +ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +{ + int new_wdt_timeout; + int ret = -ENOIOCTLCMD; + + switch(cmd) + { + case WDIOC_GETSUPPORT: + ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0; + break; + + case WDIOC_KEEPALIVE: + ar2315_wdt_enable(); + ret = 0; + break; + + case WDIOC_SETTIMEOUT: + if((ret = get_user(new_wdt_timeout, (int __user *)arg))) + break; + wdt_timeout = HEARTBEAT(new_wdt_timeout); + ar2315_wdt_enable(); + break; + + case WDIOC_GETTIMEOUT: + ret = put_user(wdt_timeout, (int __user *)arg); + break; + } + return ret; +} + +static struct file_operations ar2315_wdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = ar2315_wdt_write, + .ioctl = ar2315_wdt_ioctl, + .open = ar2315_wdt_open, + .release = ar2315_wdt_release, +}; + +static struct miscdevice ar2315_wdt_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &ar2315_wdt_fops, +}; + +static int +ar2315_wdt_probe(struct platform_device *dev) +{ + int ret = 0; + + ar2315_wdt_enable(); + ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL); + if(ret) + { + printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n"); + goto out; + } + + ret = misc_register(&ar2315_wdt_miscdev); + if(ret) + printk(KERN_ERR "ar2315wdt: failed to register miscdev\n"); + +out: + return ret; +} + +static int +ar2315_wdt_remove(struct platform_device *dev) +{ + misc_deregister(&ar2315_wdt_miscdev); + free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL); + return 0; +} + +static struct platform_driver ar2315_wdt_driver = { + .probe = ar2315_wdt_probe, + .remove = ar2315_wdt_remove, + .driver = { + .name = "ar2315_wdt", + .owner = THIS_MODULE, + }, +}; + +static int __init +init_ar2315_wdt(void) +{ + int ret = platform_driver_register(&ar2315_wdt_driver); + if(ret) + printk(KERN_INFO "ar2315_wdt: error registering platfom driver!"); + return ret; +} + +static void __exit +exit_ar2315_wdt(void) +{ + platform_driver_unregister(&ar2315_wdt_driver); +} + +module_init(init_ar2315_wdt); +module_exit(exit_ar2315_wdt); --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -916,6 +916,12 @@ config OCTEON_WDT from the first interrupt, it is then only poked when the device is written. +config ATHEROS_WDT + tristate "Atheros wisoc Watchdog Timer" + depends on ATHEROS_AR231X + help + Hardware driver for the Atheros wisoc Watchdog Timer. + # PARISC Architecture # POWERPC Architecture --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o obj-$(CONFIG_AR7_WDT) += ar7_wdt.o +obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o obj-$(CONFIG_TXX9_WDT) += txx9wdt.o obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o ' href='#n83'>83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198