diff options
Diffstat (limited to 'drivers/sbus/char/riowatchdog.c')
| -rw-r--r-- | drivers/sbus/char/riowatchdog.c | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/drivers/sbus/char/riowatchdog.c b/drivers/sbus/char/riowatchdog.c deleted file mode 100644 index b53af832a3af..000000000000 --- a/drivers/sbus/char/riowatchdog.c +++ /dev/null @@ -1,259 +0,0 @@ -/* riowatchdog.c - driver for hw watchdog inside Super I/O of RIO - * - * Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net) - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/types.h> -#include <linux/fs.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/miscdevice.h> -#include <linux/smp_lock.h> -#include <linux/watchdog.h> -#include <linux/of.h> -#include <linux/of_device.h> - -#include <asm/io.h> -#include <asm/uaccess.h> - - -/* RIO uses the NatSemi Super I/O power management logical device - * as its' watchdog. - * - * When the watchdog triggers, it asserts a line to the BBC (Boot Bus - * Controller) of the machine. The BBC can only be configured to - * trigger a power-on reset when the signal is asserted. The BBC - * can be configured to ignore the signal entirely as well. - * - * The only Super I/O device register we care about is at index - * 0x05 (WDTO_INDEX) which is the watchdog time-out in minutes (1-255). - * If set to zero, this disables the watchdog. When set, the system - * must periodically (before watchdog expires) clear (set to zero) and - * re-set the watchdog else it will trigger. - * - * There are two other indexed watchdog registers inside this Super I/O - * logical device, but they are unused. The first, at index 0x06 is - * the watchdog control and can be used to make the watchdog timer re-set - * when the PS/2 mouse or serial lines show activity. The second, at - * index 0x07 is merely a sampling of the line from the watchdog to the - * BBC. - * - * The watchdog device generates no interrupts. - */ - -MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); -MODULE_DESCRIPTION("Hardware watchdog driver for Sun RIO"); -MODULE_SUPPORTED_DEVICE("watchdog"); -MODULE_LICENSE("GPL"); - -#define RIOWD_NAME "pmc" -#define PFX RIOWD_NAME ": " - -struct riowd { - void __iomem *regs; - spinlock_t lock; -}; - -static struct riowd *riowd_device; - -#define WDTO_INDEX 0x05 - -static int riowd_timeout = 1; /* in minutes */ -module_param(riowd_timeout, int, 0); -MODULE_PARM_DESC(riowd_timeout, "Watchdog timeout in minutes"); - -static void riowd_writereg(struct riowd *p, u8 val, int index) -{ - unsigned long flags; - - spin_lock_irqsave(&p->lock, flags); - writeb(index, p->regs + 0); - writeb(val, p->regs + 1); - spin_unlock_irqrestore(&p->lock, flags); -} - -static int riowd_open(struct inode *inode, struct file *filp) -{ - cycle_kernel_lock(); - nonseekable_open(inode, filp); - return 0; -} - -static int riowd_release(struct inode *inode, struct file *filp) -{ - return 0; -} - -static int riowd_ioctl(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) -{ - static struct watchdog_info info = { - .options = WDIOF_SETTIMEOUT, - .firmware_version = 1, - .identity = "riowd", - }; - void __user *argp = (void __user *)arg; - struct riowd *p = riowd_device; - unsigned int options; - int new_margin; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &info, sizeof(info))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - if (put_user(0, (int __user *)argp)) - return -EFAULT; - break; - - case WDIOC_KEEPALIVE: - riowd_writereg(p, riowd_timeout, WDTO_INDEX); - break; - - case WDIOC_SETOPTIONS: - if (copy_from_user(&options, argp, sizeof(options))) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) - riowd_writereg(p, 0, WDTO_INDEX); - else if (options & WDIOS_ENABLECARD) - riowd_writereg(p, riowd_timeout, WDTO_INDEX); - else - return -EINVAL; - - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, (int __user *)argp)) - return -EFAULT; - if ((new_margin < 60) || (new_margin > (255 * 60))) - return -EINVAL; - riowd_timeout = (new_margin + 59) / 60; - riowd_writereg(p, riowd_timeout, WDTO_INDEX); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(riowd_timeout * 60, (int __user *)argp); - - default: - return -EINVAL; - }; - - return 0; -} - -static ssize_t riowd_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) -{ - struct riowd *p = riowd_device; - - if (count) { - riowd_writereg(p, riowd_timeout, WDTO_INDEX); - return 1; - } - - return 0; -} - -static const struct file_operations riowd_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .ioctl = riowd_ioctl, - .open = riowd_open, - .write = riowd_write, - .release = riowd_release, -}; - -static struct miscdevice riowd_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &riowd_fops -}; - -static int __devinit riowd_probe(struct of_device *op, - const struct of_device_id *match) -{ - struct riowd *p; - int err = -EINVAL; - - if (riowd_device) - goto out; - - err = -ENOMEM; - p = kzalloc(sizeof(*p), GFP_KERNEL); - if (!p) - goto out; - - spin_lock_init(&p->lock); - - p->regs = of_ioremap(&op->resource[0], 0, 2, "riowd"); - if (!p->regs) { - printk(KERN_ERR PFX "Cannot map registers.\n"); - goto out_free; - } - - err = misc_register(&riowd_miscdev); - if (err) { - printk(KERN_ERR PFX "Cannot register watchdog misc device.\n"); - goto out_iounmap; - } - - printk(KERN_INFO PFX "Hardware watchdog [%i minutes], " - "regs at %p\n", riowd_timeout, p->regs); - - dev_set_drvdata(&op->dev, p); - riowd_device = p; - err = 0; - -out_iounmap: - of_iounmap(&op->resource[0], p->regs, 2); - -out_free: - kfree(p); - -out: - return err; -} - -static int __devexit riowd_remove(struct of_device *op) -{ - struct riowd *p = dev_get_drvdata(&op->dev); - - misc_deregister(&riowd_miscdev); - of_iounmap(&op->resource[0], p->regs, 2); - kfree(p); - - return 0; -} - -static struct of_device_id riowd_match[] = { - { - .name = "pmc", - }, - {}, -}; -MODULE_DEVICE_TABLE(of, riowd_match); - -static struct of_platform_driver riowd_driver = { - .name = "riowd", - .match_table = riowd_match, - .probe = riowd_probe, - .remove = __devexit_p(riowd_remove), -}; - -static int __init riowd_init(void) -{ - return of_register_driver(&riowd_driver, &of_bus_type); -} - -static void __exit riowd_exit(void) -{ - of_unregister_driver(&riowd_driver); -} - -module_init(riowd_init); -module_exit(riowd_exit); |