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| author | Scott Wood <scottwood@freescale.com> | 2013-03-02 08:50:33 (GMT) |
|---|---|---|
| committer | Fleming Andrew-AFLEMING <AFLEMING@freescale.com> | 2013-04-12 20:55:58 (GMT) |
| commit | 4099f70e94789731c3a20f89be058cfb2bfed836 (patch) | |
| tree | 25502a586adb334e22eb975a39109fd0282ce7e7 /arch/powerpc/kernel/head_fsl_booke.S | |
| parent | e2da5b69368bcae4fd1e121725a9b438c761f51c (diff) | |
| download | linux-fsl-qoriq-4099f70e94789731c3a20f89be058cfb2bfed836.tar.xz | |
powerpc/e500: work around erratum A-006184
Erratum A-006184 says that a hang can happen under certain
circumstances when taking an exception. The erratum workaround
gives the use of a watchdog as an option, to get unstuck if a hang
does occur.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Change-Id: Ib63bea70bb2ad7ea4cee9b96ec4f7aefc21ea3b3
Reviewed-on: http://git.am.freescale.net:8181/1113
Tested-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Diffstat (limited to 'arch/powerpc/kernel/head_fsl_booke.S')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 58925b6..987a3f1 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -369,7 +369,15 @@ interrupt_base: unknown_exception, EXC_XFER_EE) /* Watchdog Timer Interrupt */ -#ifdef CONFIG_BOOKE_WDT +#ifdef CONFIG_FSL_ERRATUM_A_006184 + START_EXCEPTION(WatchdogTimer) + mtspr SPRN_SPRG_WSCRATCH_CRIT, r3 + lis r3, TSR_WIS@h + mtspr SPRN_TSR, r3 + /* use WSCRATCH to avoid any potential problems with KVM paravirt */ + mfspr r3, SPRN_SPRG_WSCRATCH_CRIT + rfci +#elif defined(CONFIG_BOOKE_WDT) CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, WatchdogException) #else CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, unknown_exception) |