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authorDavid S. Miller <davem@davemloft.net>2008-08-29 15:35:59 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-29 15:35:59 -0700
commite42311d75107ca78868ded0286b691aad2df1f29 (patch)
tree8c192e9dd599743adf9434f2273a44b88b4c88cd /drivers/sbus
parentf2be6de88d247cd57010944f62267b53c47d5ae3 (diff)
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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>
Diffstat (limited to 'drivers/sbus')
-rw-r--r--drivers/sbus/char/riowatchdog.c234
1 files changed, 99 insertions, 135 deletions
diff --git a/drivers/sbus/char/riowatchdog.c b/drivers/sbus/char/riowatchdog.c
index 88c0fc6395e..b53af832a3a 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);