diff options
| -rw-r--r-- | drivers/sbus/char/riowatchdog.c | 234 |
1 files changed, 99 insertions, 135 deletions
diff --git a/drivers/sbus/char/riowatchdog.c b/drivers/sbus/char/riowatchdog.c index 88c0fc6..b53af83 100644 --- a/drivers/sbus/char/riowatchdog.c +++ b/drivers/sbus/char/riowatchdog.c @@ -1,7 +1,6 @@ -/* $Id: riowatchdog.c,v 1.3.2.2 2002/01/23 18:48:02 davem Exp $ - * riowatchdog.c - driver for hw watchdog inside Super I/O of RIO +/* riowatchdog.c - driver for hw watchdog inside Super I/O of RIO * - * Copyright (C) 2001 David S. Miller (davem@redhat.com) + * Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net) */ #include <linux/kernel.h> @@ -12,14 +11,13 @@ #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/ebus.h> -#include <asm/bbc.h> -#include <asm/oplib.h> #include <asm/uaccess.h> -#include <asm/watchdog.h> /* RIO uses the NatSemi Super I/O power management logical device * as its' watchdog. @@ -45,74 +43,35 @@ * The watchdog device generates no interrupts. */ -MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); +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 RIOWD_MINOR 215 +#define PFX RIOWD_NAME ": " -static DEFINE_SPINLOCK(riowd_lock); +struct riowd { + void __iomem *regs; + spinlock_t lock; +}; + +static struct riowd *riowd_device; -static void __iomem *bbc_regs; -static void __iomem *riowd_regs; #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"); -#if 0 /* Currently unused. */ -static u8 riowd_readreg(int index) +static void riowd_writereg(struct riowd *p, u8 val, int index) { unsigned long flags; - u8 ret; - spin_lock_irqsave(&riowd_lock, flags); - writeb(index, riowd_regs + 0); - ret = readb(riowd_regs + 1); - spin_unlock_irqrestore(&riowd_lock, flags); - - return ret; -} -#endif - -static void riowd_writereg(u8 val, int index) -{ - unsigned long flags; - - spin_lock_irqsave(&riowd_lock, flags); - writeb(index, riowd_regs + 0); - writeb(val, riowd_regs + 1); - spin_unlock_irqrestore(&riowd_lock, flags); -} - -static void riowd_pingtimer(void) -{ - riowd_writereg(riowd_timeout, WDTO_INDEX); -} - -static void riowd_stoptimer(void) -{ - u8 val; - - riowd_writereg(0, WDTO_INDEX); - - val = readb(bbc_regs + BBC_WDACTION); - val &= ~BBC_WDACTION_RST; - writeb(val, bbc_regs + BBC_WDACTION); -} - -static void riowd_starttimer(void) -{ - u8 val; - - riowd_writereg(riowd_timeout, WDTO_INDEX); - - val = readb(bbc_regs + BBC_WDACTION); - val |= BBC_WDACTION_RST; - writeb(val, bbc_regs + BBC_WDACTION); + 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) @@ -131,9 +90,12 @@ static int riowd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { static struct watchdog_info info = { - WDIOF_SETTIMEOUT, 0, "Natl. Semiconductor PC97317" + .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; @@ -150,7 +112,7 @@ static int riowd_ioctl(struct inode *inode, struct file *filp, break; case WDIOC_KEEPALIVE: - riowd_pingtimer(); + riowd_writereg(p, riowd_timeout, WDTO_INDEX); break; case WDIOC_SETOPTIONS: @@ -158,9 +120,9 @@ static int riowd_ioctl(struct inode *inode, struct file *filp, return -EFAULT; if (options & WDIOS_DISABLECARD) - riowd_stoptimer(); + riowd_writereg(p, 0, WDTO_INDEX); else if (options & WDIOS_ENABLECARD) - riowd_starttimer(); + riowd_writereg(p, riowd_timeout, WDTO_INDEX); else return -EINVAL; @@ -170,9 +132,9 @@ static int riowd_ioctl(struct inode *inode, struct file *filp, if (get_user(new_margin, (int __user *)argp)) return -EFAULT; if ((new_margin < 60) || (new_margin > (255 * 60))) - return -EINVAL; + return -EINVAL; riowd_timeout = (new_margin + 59) / 60; - riowd_pingtimer(); + riowd_writereg(p, riowd_timeout, WDTO_INDEX); /* Fall */ case WDIOC_GETTIMEOUT: @@ -187,8 +149,10 @@ static int riowd_ioctl(struct inode *inode, struct file *filp, 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_pingtimer(); + riowd_writereg(p, riowd_timeout, WDTO_INDEX); return 1; } @@ -197,99 +161,99 @@ static ssize_t riowd_write(struct file *file, const char __user *buf, size_t cou 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 = { RIOWD_MINOR, RIOWD_NAME, &riowd_fops }; +static struct miscdevice riowd_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &riowd_fops +}; -static int __init riowd_bbc_init(void) +static int __devinit riowd_probe(struct of_device *op, + const struct of_device_id *match) { - struct linux_ebus *ebus = NULL; - struct linux_ebus_device *edev = NULL; - u8 val; - - for_each_ebus(ebus) { - for_each_ebusdev(edev, ebus) { - if (!strcmp(edev->ofdev.node->name, "bbc")) - goto found_bbc; - } - } + struct riowd *p; + int err = -EINVAL; -found_bbc: - if (!edev) - return -ENODEV; - bbc_regs = ioremap(edev->resource[0].start, BBC_REGS_SIZE); - if (!bbc_regs) - return -ENODEV; + if (riowd_device) + goto out; - /* Turn it off. */ - val = readb(bbc_regs + BBC_WDACTION); - val &= ~BBC_WDACTION_RST; - writeb(val, bbc_regs + BBC_WDACTION); + err = -ENOMEM; + p = kzalloc(sizeof(*p), GFP_KERNEL); + if (!p) + goto out; - return 0; -} + spin_lock_init(&p->lock); -static int __init riowd_init(void) -{ - struct linux_ebus *ebus = NULL; - struct linux_ebus_device *edev = NULL; - - for_each_ebus(ebus) { - for_each_ebusdev(edev, ebus) { - if (!strcmp(edev->ofdev.node->name, RIOWD_NAME)) - goto ebus_done; - } + p->regs = of_ioremap(&op->resource[0], 0, 2, "riowd"); + if (!p->regs) { + printk(KERN_ERR PFX "Cannot map registers.\n"); + goto out_free; } -ebus_done: - if (!edev) - goto fail; - - riowd_regs = ioremap(edev->resource[0].start, 2); - if (riowd_regs == NULL) { - printk(KERN_ERR "pmc: Cannot map registers.\n"); - return -ENODEV; + err = misc_register(&riowd_miscdev); + if (err) { + printk(KERN_ERR PFX "Cannot register watchdog misc device.\n"); + goto out_iounmap; } - if (riowd_bbc_init()) { - printk(KERN_ERR "pmc: Failure initializing BBC config.\n"); - goto fail; - } + printk(KERN_INFO PFX "Hardware watchdog [%i minutes], " + "regs at %p\n", riowd_timeout, p->regs); - if (misc_register(&riowd_miscdev)) { - printk(KERN_ERR "pmc: Cannot register watchdog misc device.\n"); - goto fail; - } + dev_set_drvdata(&op->dev, p); + riowd_device = p; + err = 0; - printk(KERN_INFO "pmc: Hardware watchdog [%i minutes], " - "regs at %p\n", riowd_timeout, riowd_regs); +out_iounmap: + of_iounmap(&op->resource[0], p->regs, 2); - return 0; +out_free: + kfree(p); -fail: - if (riowd_regs) { - iounmap(riowd_regs); - riowd_regs = NULL; - } - if (bbc_regs) { - iounmap(bbc_regs); - bbc_regs = NULL; - } - return -ENODEV; +out: + return err; } -static void __exit riowd_cleanup(void) +static int __devexit riowd_remove(struct of_device *op) { + struct riowd *p = dev_get_drvdata(&op->dev); + misc_deregister(&riowd_miscdev); - iounmap(riowd_regs); - riowd_regs = NULL; - iounmap(bbc_regs); - bbc_regs = NULL; + 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_cleanup); +module_exit(riowd_exit); 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