diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers/watchdog')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c | 342 |
1 files changed, 112 insertions, 230 deletions
diff --git a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c index a5ecb234e..6228c6b05 100644 --- a/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c +++ b/target/linux/ifxmips/files/drivers/watchdog/ifxmips_wdt.c @@ -1,323 +1,205 @@ /* - * 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 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. * - * 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) 2006 infineon - * Copyright (C) 2007 John Crispin <blogic@openwrt.org> + * 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 <blogic@openwrt.org> + * Based on EP93xx wdt driver */ -#include <asm/uaccess.h> -#include <linux/errno.h> -#include <linux/proc_fs.h> -#include <linux/ioctl.h> #include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/watchdog.h> +#include <linux/fs.h> #include <linux/miscdevice.h> -#include <asm-mips/ifxmips/ifxmips_wdt.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <linux/platform_device.h> +#include <asm/uaccess.h> #include <asm-mips/ifxmips/ifxmips_cgu.h> #include <asm-mips/ifxmips/ifxmips.h> -#define DRVNAME "ifxmips_wdt" +#define IFXMIPS_WDT_PW1 0x00BE0000 +#define IFXMIPS_WDT_PW2 0x00DC0000 -// TODO remove magic numbers and weirdo macros -extern unsigned int ifxmips_get_fpi_hz (void); +#ifndef CONFIG_WATCHDOG_NOWAYOUT +static int wdt_ok_to_close = 0; +#endif -static int ifxmips_wdt_inuse = 0; +int wdt_timeout = 30; int -ifxmips_wdt_enable (unsigned int timeout) +ifxmips_wdt_enable(unsigned int timeout) { - unsigned int wdt_cr = 0; - unsigned int wdt_reload = 0; - unsigned int wdt_clkdiv, wdt_pwl, ffpi; - int retval = 0; - - /* clock divider & prewarning limit */ - wdt_clkdiv = 1 << (7 * IFXMIPS_BIU_WDT_CR_CLKDIV_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR))); - wdt_pwl = 0x8000 >> IFXMIPS_BIU_WDT_CR_PWL_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR)); - - ffpi = cgu_get_io_region_clock(); - printk("cpu clock = %d\n", ffpi); - - /* caculate reload value */ - wdt_reload = (timeout * (ffpi / wdt_clkdiv)) + wdt_pwl; - - printk(KERN_WARNING DRVNAME ": wdt_pwl=0x%x, wdt_clkdiv=%d, ffpi=%d, wdt_reload = 0x%x\n", - wdt_pwl, wdt_clkdiv, ffpi, wdt_reload); - - if (wdt_reload > 0xFFFF) - { - printk(KERN_WARNING DRVNAME ": timeout too large %d\n", timeout); - retval = -EINVAL; - goto out; - } - - /* Write first part of password access */ - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); - - wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR); - wdt_cr &= (!IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & - !IFXMIPS_BIU_WDT_CR_PWL_SET(0x3) & - !IFXMIPS_BIU_WDT_CR_CLKDIV_SET(0x3) & - !IFXMIPS_BIU_WDT_CR_RELOAD_SET(0xffff)); - - wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | - IFXMIPS_BIU_WDT_CR_PWL_SET(IFXMIPS_BIU_WDT_CR_PWL_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR))) | - IFXMIPS_BIU_WDT_CR_CLKDIV_SET(IFXMIPS_BIU_WDT_CR_CLKDIV_GET(ifxmips_r32(IFXMIPS_BIU_WDT_CR))) | - IFXMIPS_BIU_WDT_CR_RELOAD_SET(wdt_reload) | - IFXMIPS_BIU_WDT_CR_GEN); - - ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR); - - printk("watchdog enabled\n"); - -out: - return retval; + u32 fpi; + fpi = cgu_get_io_region_clock(); + ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR); + ifxmips_w32(IFXMIPS_WDT_PW2 | + (0x3 << 26) | // PWL + (0x3 << 24) | // CLKDIV + (0x1 << 31) | // enable + ((timeout * (fpi / 0x40000)) + 0x1000), // reload + IFXMIPS_BIU_WDT_CR); + return 0; } void -ifxmips_wdt_disable (void) +ifxmips_wdt_disable(void) { - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2), IFXMIPS_BIU_WDT_CR); - - printk("watchdog disabled\n"); +#ifndef CONFIG_WATCHDOG_NOWAYOUT + wdt_ok_to_close = 0; +#endif + ifxmips_w32(IFXMIPS_WDT_PW1, IFXMIPS_BIU_WDT_CR); + ifxmips_w32(IFXMIPS_WDT_PW2, IFXMIPS_BIU_WDT_CR); } -/* passed LPEN or DSEN */ -void -ifxmips_wdt_enable_feature (int en, int type) +static ssize_t +ifxmips_wdt_write(struct file *file, const char __user *data, size_t len, + loff_t *ppos) { - unsigned int wdt_cr = 0; + size_t i; - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); + if(!len) + return 0; - wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR); - - if (en) +#ifndef CONFIG_WATCHDOG_NOWAYOUT + for(i = 0; i != len; i++) { - wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff)); - wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | type); - } else { - wdt_cr &= (~IFXMIPS_BIU_WDT_CR_PW_SET(0xff) & ~type); - wdt_cr |= IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2); + char c; + if(get_user(c, data + i)) + return -EFAULT; + if(c == 'V') + wdt_ok_to_close = 1; } - - ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR); -} - -void -ifxmips_wdt_prewarning_limit (int pwl) -{ - unsigned int wdt_cr = 0; - - wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR); - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); - - wdt_cr &= 0xf300ffff; - wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_PWL_SET(pwl)); - - /* Set reload value in second password access */ - ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR); +#endif + ifxmips_wdt_enable(wdt_timeout); + return len; } -void -ifxmips_wdt_set_clkdiv (int clkdiv) -{ - unsigned int wdt_cr = 0; - - wdt_cr = ifxmips_r32(IFXMIPS_BIU_WDT_CR); - ifxmips_w32(IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW1), IFXMIPS_BIU_WDT_CR); - - wdt_cr &= 0xfc00ffff; - wdt_cr |= (IFXMIPS_BIU_WDT_CR_PW_SET(IFXMIPS_WDT_PW2) | IFXMIPS_BIU_WDT_CR_CLKDIV_SET(clkdiv)); - - /* Set reload value in second password access */ - ifxmips_w32(wdt_cr, IFXMIPS_BIU_WDT_CR); -} +static struct watchdog_info ident = { + .options = WDIOF_MAGICCLOSE, + .identity = "ifxmips Watchdog", +}; static int -ifxmips_wdt_ioctl (struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) +ifxmips_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg) { - int result = 0; - static int timeout = -1; - unsigned int user_arg; - - if ((cmd != IFXMIPS_WDT_IOC_STOP) && (cmd != IFXMIPS_WDT_IOC_PING) && (cmd != IFXMIPS_WDT_IOC_GET_STATUS)) - { - if (copy_from_user((void *) &user_arg, (void *) arg, sizeof (int))){ - result = -EINVAL; - goto out; - } - } + int ret = -ENOTTY; - switch (cmd) + switch(cmd) { - case IFXMIPS_WDT_IOC_START: - if ((result = ifxmips_wdt_enable(user_arg)) < 0) - timeout = -1; - else - timeout = user_arg; - break; - - case IFXMIPS_WDT_IOC_STOP: - printk(KERN_INFO DRVNAME ": disable watch dog timer\n"); - ifxmips_wdt_disable(); - break; - - case IFXMIPS_WDT_IOC_PING: - if (timeout < 0) - result = -EIO; - else - result = ifxmips_wdt_enable(timeout); - break; - - case IFXMIPS_WDT_IOC_GET_STATUS: - user_arg = ifxmips_r32(IFXMIPS_BIU_WDT_SR); - copy_to_user((int*)arg, (int*)&user_arg, sizeof(int)); - break; - - case IFXMIPS_WDT_IOC_SET_PWL: - ifxmips_wdt_prewarning_limit(user_arg); + case WDIOC_GETSUPPORT: + ret = copy_to_user((struct watchdog_info __user *)arg, &ident, + sizeof(ident)) ? -EFAULT : 0; break; - case IFXMIPS_WDT_IOC_SET_DSEN: - ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_DSEN); + case WDIOC_GETTIMEOUT: + ret = put_user(wdt_timeout, (int __user *)arg); break; - case IFXMIPS_WDT_IOC_SET_LPEN: - ifxmips_wdt_enable_feature(user_arg, IFXMIPS_BIU_WDT_CR_LPEN); + case WDIOC_SETTIMEOUT: + ret = get_user(wdt_timeout, (int __user*)arg); break; - case IFXMIPS_WDT_IOC_SET_CLKDIV: - ifxmips_wdt_set_clkdiv(user_arg); + case WDIOC_KEEPALIVE: + ifxmips_wdt_enable(wdt_timeout); + ret = 0; break; - - default: - printk(KERN_WARNING DRVNAME ": unknown watchdog iotcl\n"); } - -out: - return result; + return ret; } static int -ifxmips_wdt_open (struct inode *inode, struct file *file) +ifxmips_wdt_open(struct inode *inode, struct file *file) { - if (ifxmips_wdt_inuse) - return -EBUSY; - - ifxmips_wdt_inuse = 1; - - return 0; + ifxmips_wdt_enable(wdt_timeout); + printk("ifxmips_wdt: activated"); + return nonseekable_open(inode, file); } -static int -ifxmips_wdt_release (struct inode *inode, struct file *file) +static int ifxmips_wdt_release(struct inode *inode, struct file *file) { - ifxmips_wdt_inuse = 0; - +#ifndef CONFIG_WATCHDOG_NOWAYOUT + if(wdt_ok_to_close) + ifxmips_wdt_disable(); + else +#endif + printk(KERN_INFO "watchdog closed without warning, rebooting system\n"); return 0; } -int -ifxmips_wdt_register_proc_read (char *buf, char **start, off_t offset, int count, - int *eof, void *data) -{ - int len = 0; - - len += sprintf (buf + len, "IFXMIPS_BIU_WDT_PROC_READ\n"); - len += sprintf (buf + len, "IFXMIPS_BIU_WDT_CR(0x%08x) : 0x%08x\n", - (unsigned int)IFXMIPS_BIU_WDT_CR, ifxmips_r32(IFXMIPS_BIU_WDT_CR)); - len += sprintf (buf + len, "IFXMIPS_BIU_WDT_SR(0x%08x) : 0x%08x\n", - (unsigned int)IFXMIPS_BIU_WDT_SR, ifxmips_r32(IFXMIPS_BIU_WDT_SR)); - - *eof = 1; - - return len; -} - static const struct file_operations ifxmips_wdt_fops = { .owner = THIS_MODULE, - .llseek = no_llseek, + .write = ifxmips_wdt_write, .ioctl = ifxmips_wdt_ioctl, .open = ifxmips_wdt_open, .release = ifxmips_wdt_release, -// .write = at91_wdt_write, }; static struct miscdevice ifxmips_wdt_miscdev = { .minor = WATCHDOG_MINOR, - .name = "ifxmips_wdt", + .name = "watchdog", .fops = &ifxmips_wdt_fops, }; - static int -ifxmips_wdt_probe (struct platform_device *pdev) +ifxmips_wdt_probe(struct platform_device *dev) { - int ret = misc_register(&ifxmips_wdt_miscdev); - if (ret) - return ret; - - create_proc_read_entry(DRVNAME, 0, NULL, ifxmips_wdt_register_proc_read, NULL); - - printk(KERN_INFO DRVNAME ": ifxmips watchdog loaded\n"); - - return 0; + int err; + err = misc_register(&ifxmips_wdt_miscdev); + if(err) + printk("ifxmips_wdt: error creating device\n"); + else + printk("ifxmips_wdt: loaded\n"); + return err; } static int -ifxmips_wdt_remove (struct platform_device *pdev) +ifxmips_wdt_remove(struct platform_device *dev) { + ifxmips_wdt_disable(); misc_deregister(&ifxmips_wdt_miscdev); - remove_proc_entry(DRVNAME, NULL); return 0; } -static struct -platform_driver ifxmips_wdt_driver = { + +static struct platform_driver ifxmips_wdt_driver = { .probe = ifxmips_wdt_probe, .remove = ifxmips_wdt_remove, .driver = { - .name = DRVNAME, + .name = "ifxmips_wdt", .owner = THIS_MODULE, }, }; -int __init -ifxmips_wdt_init_module (void) +static int __init +init_ifxmips_wdt(void) { int ret = platform_driver_register(&ifxmips_wdt_driver); - if (ret) - printk(KERN_INFO DRVNAME ": Error registering platfom driver!"); + if(ret) + printk(KERN_INFO "ifxmips_wdt: error registering platfom driver!"); return ret; } -void -ifxmips_wdt_cleanup_module (void) +static void __exit +exit_ifxmips_wdt(void) { platform_driver_unregister(&ifxmips_wdt_driver); } -module_init(ifxmips_wdt_init_module); -module_exit(ifxmips_wdt_cleanup_module); +module_init(init_ifxmips_wdt); +module_exit(exit_ifxmips_wdt); MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); -MODULE_DESCRIPTION("Watchdog driver for infineon ifxmips family"); +MODULE_DESCRIPTION("ifxmips Watchdog"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |