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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2008-08-19 22:55:15 +0900 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-10-11 16:18:44 +0100 |
| commit | 496a3b5c2c188e8af07261792b3d4e6cf1c1dab9 (patch) | |
| tree | 8b84a2f249c27d6804b3db9068f679d178c8d504 /arch/mips/txx9/generic/setup_tx4927.c | |
| parent | d75a40e90e9eb08c2159e719a90a7922dab231d3 (diff) | |
| download | blackbird-op-linux-496a3b5c2c188e8af07261792b3d4e6cf1c1dab9.tar.gz blackbird-op-linux-496a3b5c2c188e8af07261792b3d4e6cf1c1dab9.zip | |
MIPS: TXx9: Default machine_restart using watchdog reset
Add default machine_restart routine using watchdog reset of TX4927 and
TX4938.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/txx9/generic/setup_tx4927.c')
| -rw-r--r-- | arch/mips/txx9/generic/setup_tx4927.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/mips/txx9/generic/setup_tx4927.c b/arch/mips/txx9/generic/setup_tx4927.c index 0840ef930e40..7189675f6a29 100644 --- a/arch/mips/txx9/generic/setup_tx4927.c +++ b/arch/mips/txx9/generic/setup_tx4927.c @@ -15,6 +15,7 @@ #include <linux/delay.h> #include <linux/param.h> #include <linux/mtd/physmap.h> +#include <asm/reboot.h> #include <asm/txx9irq.h> #include <asm/txx9tmr.h> #include <asm/txx9pio.h> @@ -23,6 +24,10 @@ static void __init tx4927_wdr_init(void) { + /* report watchdog reset status */ + if (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDRST) + pr_warning("Watchdog reset detected at 0x%lx\n", + read_c0_errorepc()); /* clear WatchDogReset (W1C) */ tx4927_ccfg_set(TX4927_CCFG_WDRST); /* do reset on watchdog */ @@ -34,6 +39,27 @@ void __init tx4927_wdt_init(void) txx9_wdt_init(TX4927_TMR_REG(2) & 0xfffffffffULL); } +static void tx4927_machine_restart(char *command) +{ + local_irq_disable(); + pr_emerg("Rebooting (with %s watchdog reset)...\n", + (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDREXEN) ? + "external" : "internal"); + /* clear watchdog status */ + tx4927_ccfg_set(TX4927_CCFG_WDRST); /* W1C */ + txx9_wdt_now(TX4927_TMR_REG(2) & 0xfffffffffULL); + while (!(____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDRST)) + ; + mdelay(10); + if (____raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_WDREXEN) { + pr_emerg("Rebooting (with internal watchdog reset)...\n"); + /* External WDRST failed. Do internal watchdog reset */ + tx4927_ccfg_clear(TX4927_CCFG_WDREXEN); + } + /* fallback */ + (*_machine_halt)(); +} + static struct resource tx4927_sdram_resource[4]; void __init tx4927_setup(void) @@ -169,6 +195,8 @@ void __init tx4927_setup(void) txx9_gpio_init(TX4927_PIO_REG & 0xfffffffffULL, 0, TX4927_NUM_PIO); __raw_writel(0, &tx4927_pioptr->maskcpu); __raw_writel(0, &tx4927_pioptr->maskext); + + _machine_restart = tx4927_machine_restart; } void __init tx4927_time_init(unsigned int tmrnr) |
