riowatchdog: Convert to pure OF driver.
This also cleans up a lot of crud in this driver: 1) Don't touch the BBC regs, just leave the watchdog trigger behavior whatever the firmware programmed it to. 2) Use WATCHDOG_MINOR instead of hardcoded and not properly allocated RIOWD_MINOR. Hey, I haven't touched it since I wrote it years ago :-) Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
f2be6de88d
commit
e42311d751
|
@ -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)
|
||||
{
|
||||
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)
|
||||
static void riowd_writereg(struct riowd *p, 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;
|
||||
struct riowd *p;
|
||||
int err = -EINVAL;
|
||||
|
||||
for_each_ebus(ebus) {
|
||||
for_each_ebusdev(edev, ebus) {
|
||||
if (!strcmp(edev->ofdev.node->name, "bbc"))
|
||||
goto found_bbc;
|
||||
}
|
||||
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;
|
||||
}
|
||||
|
||||
found_bbc:
|
||||
if (!edev)
|
||||
return -ENODEV;
|
||||
bbc_regs = ioremap(edev->resource[0].start, BBC_REGS_SIZE);
|
||||
if (!bbc_regs)
|
||||
return -ENODEV;
|
||||
err = misc_register(&riowd_miscdev);
|
||||
if (err) {
|
||||
printk(KERN_ERR PFX "Cannot register watchdog misc device.\n");
|
||||
goto out_iounmap;
|
||||
}
|
||||
|
||||
/* Turn it off. */
|
||||
val = readb(bbc_regs + BBC_WDACTION);
|
||||
val &= ~BBC_WDACTION_RST;
|
||||
writeb(val, bbc_regs + BBC_WDACTION);
|
||||
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)
|
||||
{
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
if (riowd_bbc_init()) {
|
||||
printk(KERN_ERR "pmc: Failure initializing BBC config.\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
if (misc_register(&riowd_miscdev)) {
|
||||
printk(KERN_ERR "pmc: Cannot register watchdog misc device.\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
printk(KERN_INFO "pmc: Hardware watchdog [%i minutes], "
|
||||
"regs at %p\n", riowd_timeout, riowd_regs);
|
||||
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
if (riowd_regs) {
|
||||
iounmap(riowd_regs);
|
||||
riowd_regs = NULL;
|
||||
}
|
||||
if (bbc_regs) {
|
||||
iounmap(bbc_regs);
|
||||
bbc_regs = NULL;
|
||||
}
|
||||
return -ENODEV;
|
||||
return of_register_driver(&riowd_driver, &of_bus_type);
|
||||
}
|
||||
|
||||
static void __exit riowd_cleanup(void)
|
||||
static void __exit riowd_exit(void)
|
||||
{
|
||||
misc_deregister(&riowd_miscdev);
|
||||
iounmap(riowd_regs);
|
||||
riowd_regs = NULL;
|
||||
iounmap(bbc_regs);
|
||||
bbc_regs = NULL;
|
||||
of_unregister_driver(&riowd_driver);
|
||||
}
|
||||
|
||||
module_init(riowd_init);
|
||||
module_exit(riowd_cleanup);
|
||||
module_exit(riowd_exit);
|
||||
|
|
Loading…
Reference in New Issue