X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/969318c24f2101c94c43067e376474e13d159dcf..c57c9b688ba29ea6ef6cb05a25a245c002d53949:/target/linux/ar7/files/drivers/char/watchdog/ar7_wdt.c diff --git a/target/linux/ar7/files/drivers/char/watchdog/ar7_wdt.c b/target/linux/ar7/files/drivers/char/watchdog/ar7_wdt.c index a1bbad036..97cd8105a 100644 --- a/target/linux/ar7/files/drivers/char/watchdog/ar7_wdt.c +++ b/target/linux/ar7/files/drivers/char/watchdog/ar7_wdt.c @@ -1,7 +1,7 @@ /* - * linux/drivers/char/ar7_wdt.c - * - * Copyright (C) 2007 OpenWrt.org + * drivers/watchdog/ar7_wdt.c + * + * Copyright (C) 2007 Nicolas Thill * Copyright (c) 2005 Enrik Berkhan * * Some code taken from: @@ -12,12 +12,12 @@ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA @@ -55,6 +55,9 @@ static int nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, int, 0); MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); +#define READ_REG(x) readl((void __iomem *)&(x)) +#define WRITE_REG(x, v) writel((v), (void __iomem *)&(x)) + struct ar7_wdt { u32 kick_lock; u32 kick; @@ -93,11 +96,11 @@ static void ar7_wdt_get_regs(void) static void ar7_wdt_kick(u32 value) { - ar7_wdt->kick_lock = 0x5555; - if ((ar7_wdt->kick_lock & 3) == 1) { - ar7_wdt->kick_lock = 0xaaaa; - if ((ar7_wdt->kick_lock & 3) == 3) { - ar7_wdt->kick = value; + WRITE_REG(ar7_wdt->kick_lock, 0x5555); + if ((READ_REG(ar7_wdt->kick_lock) & 3) == 1) { + WRITE_REG(ar7_wdt->kick_lock, 0xaaaa); + if ((READ_REG(ar7_wdt->kick_lock) & 3) == 3) { + WRITE_REG(ar7_wdt->kick, value); return; } } @@ -106,11 +109,11 @@ static void ar7_wdt_kick(u32 value) static void ar7_wdt_prescale(u32 value) { - ar7_wdt->prescale_lock = 0x5a5a; - if ((ar7_wdt->prescale_lock & 3) == 1) { - ar7_wdt->prescale_lock = 0xa5a5; - if ((ar7_wdt->prescale_lock & 3) == 3) { - ar7_wdt->prescale = value; + WRITE_REG(ar7_wdt->prescale_lock, 0x5a5a); + if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 1) { + WRITE_REG(ar7_wdt->prescale_lock, 0xa5a5); + if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 3) { + WRITE_REG(ar7_wdt->prescale, value); return; } } @@ -119,11 +122,11 @@ static void ar7_wdt_prescale(u32 value) static void ar7_wdt_change(u32 value) { - ar7_wdt->change_lock = 0x6666; - if ((ar7_wdt->change_lock & 3) == 1) { - ar7_wdt->change_lock = 0xbbbb; - if ((ar7_wdt->change_lock & 3) == 3) { - ar7_wdt->change = value; + WRITE_REG(ar7_wdt->change_lock, 0x6666); + if ((READ_REG(ar7_wdt->change_lock) & 3) == 1) { + WRITE_REG(ar7_wdt->change_lock, 0xbbbb); + if ((READ_REG(ar7_wdt->change_lock) & 3) == 3) { + WRITE_REG(ar7_wdt->change, value); return; } } @@ -132,13 +135,13 @@ static void ar7_wdt_change(u32 value) static void ar7_wdt_disable(u32 value) { - ar7_wdt->disable_lock = 0x7777; - if ((ar7_wdt->disable_lock & 3) == 1) { - ar7_wdt->disable_lock = 0xcccc; - if ((ar7_wdt->disable_lock & 3) == 2) { - ar7_wdt->disable_lock = 0xdddd; - if ((ar7_wdt->disable_lock & 3) == 3) { - ar7_wdt->disable = value; + WRITE_REG(ar7_wdt->disable_lock, 0x7777); + if ((READ_REG(ar7_wdt->disable_lock) & 3) == 1) { + WRITE_REG(ar7_wdt->disable_lock, 0xcccc); + if ((READ_REG(ar7_wdt->disable_lock) & 3) == 2) { + WRITE_REG(ar7_wdt->disable_lock, 0xdddd); + if ((READ_REG(ar7_wdt->disable_lock) & 3) == 3) { + WRITE_REG(ar7_wdt->disable, value); return; } } @@ -181,7 +184,7 @@ static int ar7_wdt_open(struct inode *inode, struct file *file) ar7_wdt_enable_wdt(); expect_close = 0; - return 0; + return nonseekable_open(inode, file); } static int ar7_wdt_release(struct inode *inode, struct file *file) @@ -215,9 +218,6 @@ static struct notifier_block ar7_wdt_notifier = { static ssize_t ar7_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { - if (ppos != &file->f_pos) - return -ESPIPE; - /* check for a magic close character */ if (len) { size_t i; @@ -243,7 +243,7 @@ static int ar7_wdt_ioctl(struct inode *inode, struct file *file, static struct watchdog_info ident = { .identity = LONGNAME, .firmware_version = 1, - .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING), + .options = (WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING), }; int new_margin; @@ -314,23 +314,24 @@ static int __init ar7_wdt_init(void) sema_init(&open_semaphore, 1); - rc = misc_register(&ar7_wdt_miscdev); + rc = register_reboot_notifier(&ar7_wdt_notifier); if (rc) { - printk(KERN_ERR DRVNAME ": unable to register misc device\n"); + printk(KERN_ERR DRVNAME + ": unable to register reboot notifier\n"); goto out_alloc; } - rc = register_reboot_notifier(&ar7_wdt_notifier); + rc = misc_register(&ar7_wdt_miscdev); if (rc) { - printk(KERN_ERR DRVNAME - ": unable to register reboot notifier\n"); + printk(KERN_ERR DRVNAME ": unable to register misc device\n"); goto out_register; } goto out; out_register: - misc_deregister(&ar7_wdt_miscdev); + unregister_reboot_notifier(&ar7_wdt_notifier); out_alloc: + iounmap(ar7_wdt); release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); out: return rc; @@ -338,8 +339,8 @@ out: static void __exit ar7_wdt_cleanup(void) { - unregister_reboot_notifier(&ar7_wdt_notifier); misc_deregister(&ar7_wdt_miscdev); + unregister_reboot_notifier(&ar7_wdt_notifier); iounmap(ar7_wdt); release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); }