* or implied.
*/
-#include <linux/config.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
-#include <asm/mv64x60.h>
+#include <linux/mv643xx.h>
#include <asm/uaccess.h>
#include <asm/io.h>
+#define MV64x60_WDT_WDC_OFFSET 0
+
/* MV64x60 WDC (config) register access definitions */
#define MV64x60_WDC_CTL1_MASK (3 << 24)
#define MV64x60_WDC_CTL1(val) ((val & 3) << 24)
static unsigned long wdt_flags;
static int wdt_status;
-static void __iomem *mv64x60_regs;
+static void __iomem *mv64x60_wdt_regs;
static int mv64x60_wdt_timeout;
+static unsigned int bus_clk;
static void mv64x60_wdt_reg_write(u32 val)
{
/* Allow write only to CTL1 / CTL2 fields, retaining values in
* other fields.
*/
- u32 data = readl(mv64x60_regs + MV64x60_WDT_WDC);
+ u32 data = readl(mv64x60_wdt_regs + MV64x60_WDT_WDC_OFFSET);
data &= ~(MV64x60_WDC_CTL1_MASK | MV64x60_WDC_CTL2_MASK);
data |= val;
- writel(data, mv64x60_regs + MV64x60_WDT_WDC);
+ writel(data, mv64x60_wdt_regs + MV64x60_WDT_WDC_OFFSET);
}
static void mv64x60_wdt_service(void)
}
}
+static void mv64x60_wdt_set_timeout(int timeout)
+{
+ /* maximum bus cycle count is 0xFFFFFFFF */
+ if (timeout > 0xFFFFFFFF / bus_clk)
+ timeout = 0xFFFFFFFF / bus_clk;
+
+ mv64x60_wdt_timeout = timeout;
+ writel((timeout * bus_clk) >> 8,
+ mv64x60_wdt_regs + MV64x60_WDT_WDC_OFFSET);
+ mv64x60_wdt_service();
+}
+
static int mv64x60_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags))
mv64x60_wdt_service();
mv64x60_wdt_handler_enable();
- nonseekable_open(inode, file);
-
- return 0;
+ return nonseekable_open(inode, file);
}
static int mv64x60_wdt_release(struct inode *inode, struct file *file)
unsigned int cmd, unsigned long arg)
{
int timeout;
+ int options;
void __user *argp = (void __user *)arg;
static struct watchdog_info info = {
- .options = WDIOF_KEEPALIVEPING,
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING,
.firmware_version = 0,
.identity = "MV64x60 watchdog",
};
return -EOPNOTSUPP;
case WDIOC_SETOPTIONS:
- return -EOPNOTSUPP;
+ if (get_user(options, (int __user *)argp))
+ return -EFAULT;
+
+ if (options & WDIOS_DISABLECARD)
+ mv64x60_wdt_handler_disable();
+
+ if (options & WDIOS_ENABLECARD)
+ mv64x60_wdt_handler_enable();
+ break;
case WDIOC_KEEPALIVE:
mv64x60_wdt_service();
break;
case WDIOC_SETTIMEOUT:
- return -EOPNOTSUPP;
+ if (get_user(timeout, (int __user *)argp))
+ return -EFAULT;
+ mv64x60_wdt_set_timeout(timeout);
+ /* Fall through */
case WDIOC_GETTIMEOUT:
- timeout = mv64x60_wdt_timeout * HZ;
- if (put_user(timeout, (int __user *)argp))
+ if (put_user(mv64x60_wdt_timeout, (int __user *)argp))
return -EFAULT;
break;
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
}
return 0;
}
-static struct file_operations mv64x60_wdt_fops = {
+static const struct file_operations mv64x60_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = mv64x60_wdt_write,
static int __devinit mv64x60_wdt_probe(struct platform_device *dev)
{
struct mv64x60_wdt_pdata *pdata = dev->dev.platform_data;
- int bus_clk = 133;
+ struct resource *r;
+ int timeout = 10;
- mv64x60_wdt_timeout = 10;
+ bus_clk = 133; /* in MHz */
if (pdata) {
- mv64x60_wdt_timeout = pdata->timeout;
+ timeout = pdata->timeout;
bus_clk = pdata->bus_clk;
}
- mv64x60_regs = mv64x60_get_bridge_vbase();
+ /* Since bus_clk is truncated MHz, actual frequency could be
+ * up to 1MHz higher. Round up, since it's better to time out
+ * too late than too soon.
+ */
+ bus_clk++;
+ bus_clk *= 1000000; /* convert to Hz */
+
+ r = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (!r)
+ return -ENODEV;
+
+ mv64x60_wdt_regs = ioremap(r->start, r->end - r->start + 1);
+ if (mv64x60_wdt_regs == NULL)
+ return -ENOMEM;
- writel((mv64x60_wdt_timeout * (bus_clk * 1000000)) >> 8,
- mv64x60_regs + MV64x60_WDT_WDC);
+ mv64x60_wdt_set_timeout(timeout);
return misc_register(&mv64x60_wdt_miscdev);
}
mv64x60_wdt_service();
mv64x60_wdt_handler_disable();
+ iounmap(mv64x60_wdt_regs);
+
return 0;
}
},
};
-static struct platform_device *mv64x60_wdt_dev;
-
static int __init mv64x60_wdt_init(void)
{
- int ret;
-
printk(KERN_INFO "MV64x60 watchdog driver\n");
- mv64x60_wdt_dev = platform_device_register_simple(MV64x60_WDT_NAME,
- -1, NULL, 0);
- if (IS_ERR(mv64x60_wdt_dev)) {
- ret = PTR_ERR(mv64x60_wdt_dev);
- goto out;
- }
-
- ret = platform_driver_register(&mv64x60_wdt_driver);
- out:
- return ret;
+ return platform_driver_register(&mv64x60_wdt_driver);
}
static void __exit mv64x60_wdt_exit(void)
{
platform_driver_unregister(&mv64x60_wdt_driver);
- platform_device_unregister(mv64x60_wdt_dev);
}
module_init(mv64x60_wdt_init);