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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>
This commit is contained in:
David S. Miller
parent
f2be6de88d
commit
e42311d751
1 changed files with 102 additions and 138 deletions
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@ -1,7 +1,6 @@
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/* $Id: riowatchdog.c,v 1.3.2.2 2002/01/23 18:48:02 davem Exp $
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* riowatchdog.c - driver for hw watchdog inside Super I/O of RIO
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/* riowatchdog.c - driver for hw watchdog inside Super I/O of RIO
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*
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* Copyright (C) 2001 David S. Miller (davem@redhat.com)
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* Copyright (C) 2001, 2008 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/kernel.h>
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@ -12,14 +11,13 @@
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/smp_lock.h>
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#include <linux/watchdog.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/io.h>
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#include <asm/ebus.h>
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#include <asm/bbc.h>
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#include <asm/oplib.h>
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#include <asm/uaccess.h>
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#include <asm/watchdog.h>
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/* RIO uses the NatSemi Super I/O power management logical device
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* as its' watchdog.
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@ -45,74 +43,35 @@
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* The watchdog device generates no interrupts.
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*/
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MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
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MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
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MODULE_DESCRIPTION("Hardware watchdog driver for Sun RIO");
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MODULE_SUPPORTED_DEVICE("watchdog");
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MODULE_LICENSE("GPL");
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#define RIOWD_NAME "pmc"
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#define RIOWD_MINOR 215
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#define PFX RIOWD_NAME ": "
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static DEFINE_SPINLOCK(riowd_lock);
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struct riowd {
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void __iomem *regs;
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spinlock_t lock;
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};
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static struct riowd *riowd_device;
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static void __iomem *bbc_regs;
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static void __iomem *riowd_regs;
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#define WDTO_INDEX 0x05
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static int riowd_timeout = 1; /* in minutes */
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module_param(riowd_timeout, int, 0);
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MODULE_PARM_DESC(riowd_timeout, "Watchdog timeout in minutes");
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#if 0 /* Currently unused. */
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static u8 riowd_readreg(int index)
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{
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unsigned long flags;
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u8 ret;
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spin_lock_irqsave(&riowd_lock, flags);
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writeb(index, riowd_regs + 0);
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ret = readb(riowd_regs + 1);
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spin_unlock_irqrestore(&riowd_lock, flags);
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return ret;
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}
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#endif
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static void riowd_writereg(u8 val, int index)
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static void riowd_writereg(struct riowd *p, u8 val, int index)
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{
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unsigned long flags;
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spin_lock_irqsave(&riowd_lock, flags);
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writeb(index, riowd_regs + 0);
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writeb(val, riowd_regs + 1);
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spin_unlock_irqrestore(&riowd_lock, flags);
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}
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static void riowd_pingtimer(void)
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{
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riowd_writereg(riowd_timeout, WDTO_INDEX);
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}
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static void riowd_stoptimer(void)
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{
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u8 val;
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riowd_writereg(0, WDTO_INDEX);
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val = readb(bbc_regs + BBC_WDACTION);
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val &= ~BBC_WDACTION_RST;
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writeb(val, bbc_regs + BBC_WDACTION);
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}
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static void riowd_starttimer(void)
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{
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u8 val;
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riowd_writereg(riowd_timeout, WDTO_INDEX);
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val = readb(bbc_regs + BBC_WDACTION);
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val |= BBC_WDACTION_RST;
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writeb(val, bbc_regs + BBC_WDACTION);
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spin_lock_irqsave(&p->lock, flags);
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writeb(index, p->regs + 0);
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writeb(val, p->regs + 1);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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static int riowd_open(struct inode *inode, struct file *filp)
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@ -131,9 +90,12 @@ static int riowd_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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static struct watchdog_info info = {
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WDIOF_SETTIMEOUT, 0, "Natl. Semiconductor PC97317"
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.options = WDIOF_SETTIMEOUT,
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.firmware_version = 1,
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.identity = "riowd",
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};
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void __user *argp = (void __user *)arg;
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struct riowd *p = riowd_device;
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unsigned int options;
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int new_margin;
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@ -150,7 +112,7 @@ static int riowd_ioctl(struct inode *inode, struct file *filp,
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break;
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case WDIOC_KEEPALIVE:
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riowd_pingtimer();
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riowd_writereg(p, riowd_timeout, WDTO_INDEX);
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break;
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case WDIOC_SETOPTIONS:
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@ -158,9 +120,9 @@ static int riowd_ioctl(struct inode *inode, struct file *filp,
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return -EFAULT;
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if (options & WDIOS_DISABLECARD)
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riowd_stoptimer();
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riowd_writereg(p, 0, WDTO_INDEX);
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else if (options & WDIOS_ENABLECARD)
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riowd_starttimer();
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riowd_writereg(p, riowd_timeout, WDTO_INDEX);
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else
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return -EINVAL;
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@ -172,7 +134,7 @@ static int riowd_ioctl(struct inode *inode, struct file *filp,
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if ((new_margin < 60) || (new_margin > (255 * 60)))
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return -EINVAL;
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riowd_timeout = (new_margin + 59) / 60;
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riowd_pingtimer();
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riowd_writereg(p, riowd_timeout, WDTO_INDEX);
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/* Fall */
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case WDIOC_GETTIMEOUT:
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@ -187,8 +149,10 @@ static int riowd_ioctl(struct inode *inode, struct file *filp,
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static ssize_t riowd_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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struct riowd *p = riowd_device;
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if (count) {
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riowd_pingtimer();
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riowd_writereg(p, riowd_timeout, WDTO_INDEX);
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return 1;
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}
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@ -197,99 +161,99 @@ static ssize_t riowd_write(struct file *file, const char __user *buf, size_t cou
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static const struct file_operations riowd_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.ioctl = riowd_ioctl,
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.open = riowd_open,
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.write = riowd_write,
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.release = riowd_release,
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};
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static struct miscdevice riowd_miscdev = { RIOWD_MINOR, RIOWD_NAME, &riowd_fops };
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static struct miscdevice riowd_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &riowd_fops
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};
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static int __init riowd_bbc_init(void)
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static int __devinit riowd_probe(struct of_device *op,
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const struct of_device_id *match)
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{
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struct linux_ebus *ebus = NULL;
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struct linux_ebus_device *edev = NULL;
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u8 val;
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struct riowd *p;
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int err = -EINVAL;
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for_each_ebus(ebus) {
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for_each_ebusdev(edev, ebus) {
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if (!strcmp(edev->ofdev.node->name, "bbc"))
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goto found_bbc;
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}
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if (riowd_device)
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goto out;
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err = -ENOMEM;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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goto out;
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spin_lock_init(&p->lock);
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p->regs = of_ioremap(&op->resource[0], 0, 2, "riowd");
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if (!p->regs) {
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printk(KERN_ERR PFX "Cannot map registers.\n");
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goto out_free;
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}
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found_bbc:
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if (!edev)
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return -ENODEV;
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bbc_regs = ioremap(edev->resource[0].start, BBC_REGS_SIZE);
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if (!bbc_regs)
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return -ENODEV;
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err = misc_register(&riowd_miscdev);
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if (err) {
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printk(KERN_ERR PFX "Cannot register watchdog misc device.\n");
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goto out_iounmap;
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}
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/* Turn it off. */
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val = readb(bbc_regs + BBC_WDACTION);
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val &= ~BBC_WDACTION_RST;
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writeb(val, bbc_regs + BBC_WDACTION);
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printk(KERN_INFO PFX "Hardware watchdog [%i minutes], "
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"regs at %p\n", riowd_timeout, p->regs);
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dev_set_drvdata(&op->dev, p);
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riowd_device = p;
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err = 0;
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out_iounmap:
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of_iounmap(&op->resource[0], p->regs, 2);
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out_free:
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kfree(p);
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out:
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return err;
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}
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static int __devexit riowd_remove(struct of_device *op)
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{
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struct riowd *p = dev_get_drvdata(&op->dev);
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misc_deregister(&riowd_miscdev);
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of_iounmap(&op->resource[0], p->regs, 2);
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kfree(p);
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return 0;
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}
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static struct of_device_id riowd_match[] = {
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{
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.name = "pmc",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, riowd_match);
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static struct of_platform_driver riowd_driver = {
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.name = "riowd",
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.match_table = riowd_match,
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.probe = riowd_probe,
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.remove = __devexit_p(riowd_remove),
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};
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static int __init riowd_init(void)
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{
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struct linux_ebus *ebus = NULL;
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struct linux_ebus_device *edev = NULL;
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for_each_ebus(ebus) {
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for_each_ebusdev(edev, ebus) {
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if (!strcmp(edev->ofdev.node->name, RIOWD_NAME))
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goto ebus_done;
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}
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return of_register_driver(&riowd_driver, &of_bus_type);
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}
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ebus_done:
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if (!edev)
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goto fail;
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riowd_regs = ioremap(edev->resource[0].start, 2);
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if (riowd_regs == NULL) {
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printk(KERN_ERR "pmc: Cannot map registers.\n");
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return -ENODEV;
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}
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if (riowd_bbc_init()) {
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printk(KERN_ERR "pmc: Failure initializing BBC config.\n");
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goto fail;
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}
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if (misc_register(&riowd_miscdev)) {
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printk(KERN_ERR "pmc: Cannot register watchdog misc device.\n");
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goto fail;
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}
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printk(KERN_INFO "pmc: Hardware watchdog [%i minutes], "
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"regs at %p\n", riowd_timeout, riowd_regs);
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return 0;
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fail:
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if (riowd_regs) {
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iounmap(riowd_regs);
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riowd_regs = NULL;
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}
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if (bbc_regs) {
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iounmap(bbc_regs);
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bbc_regs = NULL;
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}
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return -ENODEV;
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}
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static void __exit riowd_cleanup(void)
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static void __exit riowd_exit(void)
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{
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misc_deregister(&riowd_miscdev);
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iounmap(riowd_regs);
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riowd_regs = NULL;
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iounmap(bbc_regs);
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bbc_regs = NULL;
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of_unregister_driver(&riowd_driver);
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}
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module_init(riowd_init);
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module_exit(riowd_cleanup);
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module_exit(riowd_exit);
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