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Diffstat (limited to 'drivers/watchdog/cpwd.c')
-rw-r--r--drivers/watchdog/cpwd.c210
1 files changed, 102 insertions, 108 deletions
diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index 084dfe9cecf..e55ed702209 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -1,41 +1,41 @@
/* cpwd.c - driver implementation for hardware watchdog
* timers found on Sun Microsystems CP1400 and CP1500 boards.
*
- * This device supports both the generic Linux watchdog
+ * This device supports both the generic Linux watchdog
* interface and Solaris-compatible ioctls as best it is
* able.
*
- * NOTE: CP1400 systems appear to have a defective intr_mask
- * register on the PLD, preventing the disabling of
- * timer interrupts. We use a timer to periodically
- * reset 'stopped' watchdogs on affected platforms.
+ * NOTE: CP1400 systems appear to have a defective intr_mask
+ * register on the PLD, preventing the disabling of
+ * timer interrupts. We use a timer to periodically
+ * reset 'stopped' watchdogs on affected platforms.
*
* Copyright (c) 2000 Eric Brower (ebrower@usa.net)
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/major.h>
-#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timer.h>
-#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/uaccess.h>
#include <asm/irq.h>
-#include <asm/uaccess.h>
-
#include <asm/watchdog.h>
#define DRIVER_NAME "cpwd"
-#define PFX DRIVER_NAME ": "
#define WD_OBPNAME "watchdog"
#define WD_BADMODEL "SUNW,501-5336"
@@ -43,8 +43,8 @@
#define WD_BLIMIT 0xFFFF
#define WD0_MINOR 212
-#define WD1_MINOR 213
-#define WD2_MINOR 214
+#define WD1_MINOR 213
+#define WD2_MINOR 214
/* Internal driver definitions. */
#define WD0_ID 0
@@ -89,29 +89,31 @@ struct cpwd {
} devs[WD_NUMDEVS];
};
+static DEFINE_MUTEX(cpwd_mutex);
static struct cpwd *cpwd_device;
-/* Sun uses Altera PLD EPF8820ATC144-4
+/* Sun uses Altera PLD EPF8820ATC144-4
* providing three hardware watchdogs:
*
- * 1) RIC - sends an interrupt when triggered
- * 2) XIR - asserts XIR_B_RESET when triggered, resets CPU
- * 3) POR - asserts POR_B_RESET when triggered, resets CPU, backplane, board
+ * 1) RIC - sends an interrupt when triggered
+ * 2) XIR - asserts XIR_B_RESET when triggered, resets CPU
+ * 3) POR - asserts POR_B_RESET when triggered, resets CPU, backplane, board
*
*** Timer register block definition (struct wd_timer_regblk)
*
- * dcntr and limit registers (halfword access):
+ * dcntr and limit registers (halfword access):
* -------------------
* | 15 | ...| 1 | 0 |
* -------------------
* |- counter val -|
* -------------------
- * dcntr - Current 16-bit downcounter value.
- * When downcounter reaches '0' watchdog expires.
- * Reading this register resets downcounter with 'limit' value.
- * limit - 16-bit countdown value in 1/10th second increments.
- * Writing this register begins countdown with input value.
- * Reading from this register does not affect counter.
+ * dcntr - Current 16-bit downcounter value.
+ * When downcounter reaches '0' watchdog expires.
+ * Reading this register resets downcounter with
+ * 'limit' value.
+ * limit - 16-bit countdown value in 1/10th second increments.
+ * Writing this register begins countdown with input value.
+ * Reading from this register does not affect counter.
* NOTES: After watchdog reset, dcntr and limit contain '1'
*
* status register (byte access):
@@ -121,7 +123,7 @@ static struct cpwd *cpwd_device;
* |- UNUSED -| EXP | RUN |
* ---------------------------
* status- Bit 0 - Watchdog is running
- * Bit 1 - Watchdog has expired
+ * Bit 1 - Watchdog has expired
*
*** PLD register block definition (struct wd_pld_regblk)
*
@@ -154,15 +156,15 @@ static struct cpwd *cpwd_device;
static struct timer_list cpwd_timer;
-static int wd0_timeout = 0;
-static int wd1_timeout = 0;
-static int wd2_timeout = 0;
+static int wd0_timeout;
+static int wd1_timeout;
+static int wd2_timeout;
-module_param (wd0_timeout, int, 0);
+module_param(wd0_timeout, int, 0);
MODULE_PARM_DESC(wd0_timeout, "Default watchdog0 timeout in 1/10secs");
-module_param (wd1_timeout, int, 0);
+module_param(wd1_timeout, int, 0);
MODULE_PARM_DESC(wd1_timeout, "Default watchdog1 timeout in 1/10secs");
-module_param (wd2_timeout, int, 0);
+module_param(wd2_timeout, int, 0);
MODULE_PARM_DESC(wd2_timeout, "Default watchdog2 timeout in 1/10secs");
MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
@@ -195,15 +197,15 @@ static u8 cpwd_readb(void __iomem *addr)
* Because of the CP1400 defect this should only be
* called during initialzation or by wd_[start|stop]timer()
*
- * index - sub-device index, or -1 for 'all'
+ * index - sub-device index, or -1 for 'all'
* enable - non-zero to enable interrupts, zero to disable
*/
static void cpwd_toggleintr(struct cpwd *p, int index, int enable)
{
unsigned char curregs = cpwd_readb(p->regs + PLD_IMASK);
- unsigned char setregs =
- (index == -1) ?
- (WD0_INTR_MASK | WD1_INTR_MASK | WD2_INTR_MASK) :
+ unsigned char setregs =
+ (index == -1) ?
+ (WD0_INTR_MASK | WD1_INTR_MASK | WD2_INTR_MASK) :
(p->devs[index].intr_mask);
if (enable == WD_INTR_ON)
@@ -303,25 +305,25 @@ static int cpwd_getstatus(struct cpwd *p, int index)
unsigned char ret = WD_STOPPED;
/* determine STOPPED */
- if (!stat)
+ if (!stat)
return ret;
/* determine EXPIRED vs FREERUN vs RUNNING */
else if (WD_S_EXPIRED & stat) {
ret = WD_EXPIRED;
- } else if(WD_S_RUNNING & stat) {
+ } else if (WD_S_RUNNING & stat) {
if (intr & p->devs[index].intr_mask) {
ret = WD_FREERUN;
} else {
/* Fudge WD_EXPIRED status for defective CP1400--
- * IF timer is running
- * AND brokenstop is set
- * AND an interrupt has been serviced
+ * IF timer is running
+ * AND brokenstop is set
+ * AND an interrupt has been serviced
* we are WD_EXPIRED.
*
- * IF timer is running
- * AND brokenstop is set
- * AND no interrupt has been serviced
+ * IF timer is running
+ * AND brokenstop is set
+ * AND no interrupt has been serviced
* we are WD_FREERUN.
*/
if (p->broken &&
@@ -329,7 +331,8 @@ static int cpwd_getstatus(struct cpwd *p, int index)
if (p->devs[index].runstatus & WD_STAT_SVCD) {
ret = WD_EXPIRED;
} else {
- /* we could as well pretend we are expired */
+ /* we could as well pretend
+ * we are expired */
ret = WD_FREERUN;
}
} else {
@@ -342,7 +345,7 @@ static int cpwd_getstatus(struct cpwd *p, int index)
if (p->devs[index].runstatus & WD_STAT_SVCD)
ret |= WD_SERVICED;
- return(ret);
+ return ret;
}
static irqreturn_t cpwd_interrupt(int irq, void *dev_id)
@@ -366,31 +369,30 @@ static int cpwd_open(struct inode *inode, struct file *f)
{
struct cpwd *p = cpwd_device;
- lock_kernel();
- switch(iminor(inode)) {
- case WD0_MINOR:
- case WD1_MINOR:
- case WD2_MINOR:
- break;
+ mutex_lock(&cpwd_mutex);
+ switch (iminor(inode)) {
+ case WD0_MINOR:
+ case WD1_MINOR:
+ case WD2_MINOR:
+ break;
- default:
- unlock_kernel();
- return -ENODEV;
+ default:
+ mutex_unlock(&cpwd_mutex);
+ return -ENODEV;
}
/* Register IRQ on first open of device */
if (!p->initialized) {
- if (request_irq(p->irq, &cpwd_interrupt,
+ if (request_irq(p->irq, &cpwd_interrupt,
IRQF_SHARED, DRIVER_NAME, p)) {
- printk(KERN_ERR PFX "Cannot register IRQ %d\n",
- p->irq);
- unlock_kernel();
+ pr_err("Cannot register IRQ %d\n", p->irq);
+ mutex_unlock(&cpwd_mutex);
return -EBUSY;
}
p->initialized = true;
}
- unlock_kernel();
+ mutex_unlock(&cpwd_mutex);
return nonseekable_open(inode, f);
}
@@ -400,15 +402,15 @@ static int cpwd_release(struct inode *inode, struct file *file)
return 0;
}
-static int cpwd_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long cpwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- static struct watchdog_info info = {
+ static const struct watchdog_info info = {
.options = WDIOF_SETTIMEOUT,
.firmware_version = 1,
.identity = DRIVER_NAME,
};
void __user *argp = (void __user *)arg;
+ struct inode *inode = file_inode(file);
int index = iminor(inode) - WD0_MINOR;
struct cpwd *p = cpwd_device;
int setopt = 0;
@@ -442,7 +444,7 @@ static int cpwd_ioctl(struct inode *inode, struct file *file,
cpwd_starttimer(p, index);
} else {
return -EINVAL;
- }
+ }
break;
/* Solaris-compatible IOCTLs */
@@ -458,7 +460,7 @@ static int cpwd_ioctl(struct inode *inode, struct file *file,
case WIOCSTOP:
if (p->enabled)
- return(-EINVAL);
+ return -EINVAL;
cpwd_stoptimer(p, index);
break;
@@ -480,9 +482,9 @@ static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
case WIOCSTART:
case WIOCSTOP:
case WIOCGSTAT:
- lock_kernel();
- rval = cpwd_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
- unlock_kernel();
+ mutex_lock(&cpwd_mutex);
+ rval = cpwd_ioctl(file, cmd, arg);
+ mutex_unlock(&cpwd_mutex);
break;
/* everything else is handled by the generic compat layer */
@@ -493,10 +495,10 @@ static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
return rval;
}
-static ssize_t cpwd_write(struct file *file, const char __user *buf,
+static ssize_t cpwd_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
struct cpwd *p = cpwd_device;
int index = iminor(inode);
@@ -508,24 +510,24 @@ static ssize_t cpwd_write(struct file *file, const char __user *buf,
return 0;
}
-static ssize_t cpwd_read(struct file * file, char __user *buffer,
+static ssize_t cpwd_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static const struct file_operations cpwd_fops = {
- .owner = THIS_MODULE,
- .ioctl = cpwd_ioctl,
- .compat_ioctl = cpwd_compat_ioctl,
- .open = cpwd_open,
- .write = cpwd_write,
- .read = cpwd_read,
- .release = cpwd_release,
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = cpwd_ioctl,
+ .compat_ioctl = cpwd_compat_ioctl,
+ .open = cpwd_open,
+ .write = cpwd_write,
+ .read = cpwd_read,
+ .release = cpwd_release,
+ .llseek = no_llseek,
};
-static int __devinit cpwd_probe(struct of_device *op,
- const struct of_device_id *match)
+static int cpwd_probe(struct platform_device *op)
{
struct device_node *options;
const char *str_prop;
@@ -539,25 +541,25 @@ static int __devinit cpwd_probe(struct of_device *op,
p = kzalloc(sizeof(*p), GFP_KERNEL);
err = -ENOMEM;
if (!p) {
- printk(KERN_ERR PFX "Unable to allocate struct cpwd.\n");
+ pr_err("Unable to allocate struct cpwd\n");
goto out;
}
- p->irq = op->irqs[0];
+ p->irq = op->archdata.irqs[0];
spin_lock_init(&p->lock);
p->regs = of_ioremap(&op->resource[0], 0,
4 * WD_TIMER_REGSZ, DRIVER_NAME);
if (!p->regs) {
- printk(KERN_ERR PFX "Unable to map registers.\n");
+ pr_err("Unable to map registers\n");
goto out_free;
}
options = of_find_node_by_path("/options");
err = -ENODEV;
if (!options) {
- printk(KERN_ERR PFX "Unable to find /options node.\n");
+ pr_err("Unable to find /options node\n");
goto out_iounmap;
}
@@ -575,7 +577,7 @@ static int __devinit cpwd_probe(struct of_device *op,
* interrupt_mask register cannot be written, so no timer
* interrupts can be masked within the PLD.
*/
- str_prop = of_get_property(op->node, "model", NULL);
+ str_prop = of_get_property(op->dev.of_node, "model", NULL);
p->broken = (str_prop && !strcmp(str_prop, WD_BADMODEL));
if (!p->enabled)
@@ -602,23 +604,23 @@ static int __devinit cpwd_probe(struct of_device *op,
err = misc_register(&p->devs[i].misc);
if (err) {
- printk(KERN_ERR "Could not register misc device for "
- "dev %d\n", i);
+ pr_err("Could not register misc device for dev %d\n",
+ i);
goto out_unregister;
}
}
if (p->broken) {
init_timer(&cpwd_timer);
- cpwd_timer.function = cpwd_brokentimer;
+ cpwd_timer.function = cpwd_brokentimer;
cpwd_timer.data = (unsigned long) p;
cpwd_timer.expires = WD_BTIMEOUT;
- printk(KERN_INFO PFX "PLD defect workaround enabled for "
- "model " WD_BADMODEL ".\n");
+ pr_info("PLD defect workaround enabled for model %s\n",
+ WD_BADMODEL);
}
- dev_set_drvdata(&op->dev, p);
+ platform_set_drvdata(op, p);
cpwd_device = p;
err = 0;
@@ -637,12 +639,12 @@ out_free:
goto out;
}
-static int __devexit cpwd_remove(struct of_device *op)
+static int cpwd_remove(struct platform_device *op)
{
- struct cpwd *p = dev_get_drvdata(&op->dev);
+ struct cpwd *p = platform_get_drvdata(op);
int i;
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < WD_NUMDEVS; i++) {
misc_deregister(&p->devs[i].misc);
if (!p->enabled) {
@@ -674,22 +676,14 @@ static const struct of_device_id cpwd_match[] = {
};
MODULE_DEVICE_TABLE(of, cpwd_match);
-static struct of_platform_driver cpwd_driver = {
- .name = DRIVER_NAME,
- .match_table = cpwd_match,
+static struct platform_driver cpwd_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = cpwd_match,
+ },
.probe = cpwd_probe,
- .remove = __devexit_p(cpwd_remove),
+ .remove = cpwd_remove,
};
-static int __init cpwd_init(void)
-{
- return of_register_driver(&cpwd_driver, &of_bus_type);
-}
-
-static void __exit cpwd_exit(void)
-{
- of_unregister_driver(&cpwd_driver);
-}
-
-module_init(cpwd_init);
-module_exit(cpwd_exit);
+module_platform_driver(cpwd_driver);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 18:22:19 +0000