diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/watchdog/mpc8xxx_wdt.c | 44 |
2 files changed, 35 insertions, 12 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 01e33e80eac..50d44b4b466 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -697,10 +697,11 @@ config 8xx_WDT config 8xxx_WDT tristate "MPC8xxx Platform Watchdog Timer" - depends on PPC_83xx || PPC_86xx + depends on PPC_8xx || PPC_83xx || PPC_86xx help This driver is for a SoC level watchdog that exists on some Freescale PowerPC processors. So far this driver supports: + - MPC8xx watchdogs - MPC83xx watchdogs - MPC86xx watchdogs diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c index 3c5ed9e2622..f2094960e66 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); |