diff options
author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-07-03 23:51:34 -0700 |
---|---|---|
committer | Wim Van Sebroeck <wim@iguana.be> | 2008-08-06 13:06:25 +0000 |
commit | 28acd02f9f9efe44718de3bbe8be22d6dfb7e47f (patch) | |
tree | a9afe194d2d4cee5d3356f25c790b4486dd2b77a /drivers/watchdog/mpc83xx_wdt.c | |
parent | 500c919e3d699644cc9d6c1e93022481baafd8e1 (diff) |
[WATCHDOG] mpc83xx_wdt: rename to mpc8xxx_wdt
Rename the driver because now we support some MPC86xx processors.
There are no changes to the mpc83xx_wdt.c file, yet. When possible, we do
file renames and changes separately (because Linus once asked so, because
it helps git to track the renamed files).
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/watchdog/mpc83xx_wdt.c')
-rw-r--r-- | drivers/watchdog/mpc83xx_wdt.c | 294 |
1 files changed, 0 insertions, 294 deletions
diff --git a/drivers/watchdog/mpc83xx_wdt.c b/drivers/watchdog/mpc83xx_wdt.c deleted file mode 100644 index fa82ec99ba8..00000000000 --- a/drivers/watchdog/mpc83xx_wdt.c +++ /dev/null @@ -1,294 +0,0 @@ -/* - * mpc83xx_wdt.c - MPC83xx/MPC86xx watchdog userspace interface - * - * Authors: Dave Updegraff <dave@cray.org> - * Kumar Gala <galak@kernel.crashing.org> - * Attribution: from 83xx_wst: Florian Schirmer <jolt@tuxbox.org> - * ..and from sc520_wdt - * Copyright (c) 2008 MontaVista Software, Inc. - * Anton Vorontsov <avorontsov@ru.mvista.com> - * - * Note: it appears that you can only actually ENABLE or DISABLE the thing - * once after POR. Once enabled, you cannot disable, and vice versa. - * - * 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. - */ - -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/timer.h> -#include <linux/miscdevice.h> -#include <linux/of_platform.h> -#include <linux/module.h> -#include <linux/watchdog.h> -#include <linux/io.h> -#include <linux/uaccess.h> -#include <sysdev/fsl_soc.h> - -struct mpc83xx_wdt { - __be32 res0; - __be32 swcrr; /* System watchdog control register */ -#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */ -#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */ -#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/ -#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */ - __be32 swcnr; /* System watchdog count register */ - u8 res1[2]; - __be16 swsrr; /* System watchdog service register */ - u8 res2[0xF0]; -}; - -struct mpc83xx_wdt_type { - int prescaler; - bool hw_enabled; -}; - -static struct mpc83xx_wdt __iomem *wd_base; - -static u16 timeout = 0xffff; -module_param(timeout, ushort, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in ticks. (0<timeout<65536, default=65535"); - -static int reset = 1; -module_param(reset, bool, 0); -MODULE_PARM_DESC(reset, - "Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " - "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* - * We always prescale, but if someone really doesn't want to they can set this - * to 0 - */ -static int prescale = 1; -static unsigned int timeout_sec; - -static unsigned long wdt_is_open; -static DEFINE_SPINLOCK(wdt_spinlock); - -static void mpc83xx_wdt_keepalive(void) -{ - /* Ping the WDT */ - spin_lock(&wdt_spinlock); - out_be16(&wd_base->swsrr, 0x556c); - out_be16(&wd_base->swsrr, 0xaa39); - spin_unlock(&wdt_spinlock); -} - -static void mpc83xx_wdt_timer_ping(unsigned long arg); -static DEFINE_TIMER(wdt_timer, mpc83xx_wdt_timer_ping, 0, 0); - -static void mpc83xx_wdt_timer_ping(unsigned long arg) -{ - mpc83xx_wdt_keepalive(); - /* We're pinging it twice faster than needed, just to be sure. */ - mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2); -} - -static void mpc83xx_wdt_pr_warn(const char *msg) -{ - pr_crit("mpc83xx_wdt: %s, expect the %s soon!\n", msg, - reset ? "reset" : "machine check exception"); -} - -static ssize_t mpc83xx_wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) - mpc83xx_wdt_keepalive(); - return count; -} - -static int mpc83xx_wdt_open(struct inode *inode, struct file *file) -{ - u32 tmp = SWCRR_SWEN; - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - - /* Once we start the watchdog we can't stop it */ - if (nowayout) - __module_get(THIS_MODULE); - - /* Good, fire up the show */ - if (prescale) - tmp |= SWCRR_SWPR; - if (reset) - tmp |= SWCRR_SWRI; - - tmp |= timeout << 16; - - out_be32(&wd_base->swcrr, tmp); - - del_timer_sync(&wdt_timer); - - return nonseekable_open(inode, file); -} - -static int mpc83xx_wdt_release(struct inode *inode, struct file *file) -{ - if (!nowayout) - mpc83xx_wdt_timer_ping(0); - else - mpc83xx_wdt_pr_warn("watchdog closed"); - clear_bit(0, &wdt_is_open); - return 0; -} - -static long mpc83xx_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING, - .firmware_version = 1, - .identity = "MPC83xx", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - case WDIOC_KEEPALIVE: - mpc83xx_wdt_keepalive(); - return 0; - case WDIOC_GETTIMEOUT: - return put_user(timeout_sec, p); - default: - return -ENOTTY; - } -} - -static const struct file_operations mpc83xx_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = mpc83xx_wdt_write, - .unlocked_ioctl = mpc83xx_wdt_ioctl, - .open = mpc83xx_wdt_open, - .release = mpc83xx_wdt_release, -}; - -static struct miscdevice mpc83xx_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &mpc83xx_wdt_fops, -}; - -static int __devinit mpc83xx_wdt_probe(struct of_device *ofdev, - const struct of_device_id *match) -{ - int ret; - struct device_node *np = ofdev->node; - struct mpc83xx_wdt_type *wdt_type = match->data; - u32 freq = fsl_get_sys_freq(); - bool enabled; - - if (!freq || freq == -1) - return -EINVAL; - - wd_base = of_iomap(np, 0); - if (!wd_base) - return -ENOMEM; - - enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN; - if (!enabled && wdt_type->hw_enabled) { - pr_info("mpc83xx_wdt: could not be enabled in software\n"); - ret = -ENOSYS; - goto err_unmap; - } - - ret = misc_register(&mpc83xx_wdt_miscdev); - if (ret) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto err_unmap; - } - - /* Calculate the timeout in seconds */ - if (prescale) - timeout_sec = (timeout * wdt_type->prescaler) / freq; - else - timeout_sec = timeout / freq; - - pr_info("WDT driver for MPC83xx initialized. mode:%s timeout=%d " - "(%d seconds)\n", reset ? "reset" : "interrupt", timeout, - timeout_sec); - - /* - * If the watchdog was previously enabled or we're running on - * MPC86xx, we should ping the wdt from the kernel until the - * userspace handles it. - */ - if (enabled) - mpc83xx_wdt_timer_ping(0); - return 0; -err_unmap: - iounmap(wd_base); - return ret; -} - -static int __devexit mpc83xx_wdt_remove(struct of_device *ofdev) -{ - mpc83xx_wdt_pr_warn("watchdog removed"); - del_timer_sync(&wdt_timer); - misc_deregister(&mpc83xx_wdt_miscdev); - iounmap(wd_base); - - return 0; -} - -static const struct of_device_id mpc83xx_wdt_match[] = { - { - .compatible = "mpc83xx_wdt", - .data = &(struct mpc83xx_wdt_type) { - .prescaler = 0x10000, - }, - }, - { - .compatible = "fsl,mpc8610-wdt", - .data = &(struct mpc83xx_wdt_type) { - .prescaler = 0x10000, - .hw_enabled = true, - }, - }, - {}, -}; -MODULE_DEVICE_TABLE(of, mpc83xx_wdt_match); - -static struct of_platform_driver mpc83xx_wdt_driver = { - .match_table = mpc83xx_wdt_match, - .probe = mpc83xx_wdt_probe, - .remove = __devexit_p(mpc83xx_wdt_remove), - .driver = { - .name = "mpc83xx_wdt", - .owner = THIS_MODULE, - }, -}; - -static int __init mpc83xx_wdt_init(void) -{ - return of_register_platform_driver(&mpc83xx_wdt_driver); -} - -static void __exit mpc83xx_wdt_exit(void) -{ - of_unregister_platform_driver(&mpc83xx_wdt_driver); -} - -subsys_initcall(mpc83xx_wdt_init); -module_exit(mpc83xx_wdt_exit); - -MODULE_AUTHOR("Dave Updegraff, Kumar Gala"); -MODULE_DESCRIPTION("Driver for watchdog timer in MPC83xx/MPC86xx uProcessors"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |