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path: root/drivers/watchdog/mpc8xxx_wdt.c
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Diffstat (limited to 'drivers/watchdog/mpc8xxx_wdt.c')
-rw-r--r--drivers/watchdog/mpc8xxx_wdt.c44
1 files changed, 33 insertions, 11 deletions
diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c
index 3c5ed9e26226..f2094960e662 100644
--- a/drivers/watchdog/mpc8xxx_wdt.c
+++ b/drivers/watchdog/mpc8xxx_wdt.c
@@ -1,5 +1,5 @@
/*
- * mpc8xxx_wdt.c - MPC83xx/MPC86xx watchdog userspace interface
+ * mpc8xxx_wdt.c - MPC8xx/MPC83xx/MPC86xx watchdog userspace interface
*
* Authors: Dave Updegraff <dave@cray.org>
* Kumar Gala <galak@kernel.crashing.org>
@@ -207,13 +207,6 @@ static int __devinit mpc8xxx_wdt_probe(struct of_device *ofdev,
goto err_unmap;
}
- ret = misc_register(&mpc8xxx_wdt_miscdev);
- if (ret) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto err_unmap;
- }
-
/* Calculate the timeout in seconds */
if (prescale)
timeout_sec = (timeout * wdt_type->prescaler) / freq;
@@ -234,6 +227,7 @@ static int __devinit mpc8xxx_wdt_probe(struct of_device *ofdev,
return 0;
err_unmap:
iounmap(wd_base);
+ wd_base = NULL;
return ret;
}
@@ -261,6 +255,12 @@ static const struct of_device_id mpc8xxx_wdt_match[] = {
.hw_enabled = true,
},
},
+ {
+ .compatible = "fsl,mpc823-wdt",
+ .data = &(struct mpc8xxx_wdt_type) {
+ .prescaler = 0x800,
+ },
+ },
{},
};
MODULE_DEVICE_TABLE(of, mpc8xxx_wdt_match);
@@ -275,20 +275,42 @@ static struct of_platform_driver mpc8xxx_wdt_driver = {
},
};
+/*
+ * We do wdt initialization in two steps: arch_initcall probes the wdt
+ * very early to start pinging the watchdog (misc devices are not yet
+ * available), and later module_init() just registers the misc device.
+ */
+static int __init mpc8xxx_wdt_init_late(void)
+{
+ int ret;
+
+ if (!wd_base)
+ return -ENODEV;
+
+ ret = misc_register(&mpc8xxx_wdt_miscdev);
+ if (ret) {
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ return ret;
+ }
+ return 0;
+}
+module_init(mpc8xxx_wdt_init_late);
+
static int __init mpc8xxx_wdt_init(void)
{
return of_register_platform_driver(&mpc8xxx_wdt_driver);
}
+arch_initcall(mpc8xxx_wdt_init);
static void __exit mpc8xxx_wdt_exit(void)
{
of_unregister_platform_driver(&mpc8xxx_wdt_driver);
}
-
-subsys_initcall(mpc8xxx_wdt_init);
module_exit(mpc8xxx_wdt_exit);
MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
-MODULE_DESCRIPTION("Driver for watchdog timer in MPC83xx/MPC86xx uProcessors");
+MODULE_DESCRIPTION("Driver for watchdog timer in MPC8xx/MPC83xx/MPC86xx "
+ "uProcessors");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);