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author | Akira Takeuchi <takeuchi.akr@jp.panasonic.com> | 2010-10-27 17:28:48 +0100 |
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committer | David Howells <dhowells@redhat.com> | 2010-10-27 17:28:48 +0100 |
commit | 8f19e3daf3fffee9e18a8812067a6a4b538ae6c8 (patch) | |
tree | 854a50f4fae7f35688171cb20874cfddabda99a4 /arch/mn10300 | |
parent | 633171861a3120af011bb1ee8dd40069951dfeac (diff) | |
download | kernel_samsung_smdk4412-8f19e3daf3fffee9e18a8812067a6a4b538ae6c8.zip kernel_samsung_smdk4412-8f19e3daf3fffee9e18a8812067a6a4b538ae6c8.tar.gz kernel_samsung_smdk4412-8f19e3daf3fffee9e18a8812067a6a4b538ae6c8.tar.bz2 |
MN10300: AM34 erratum requires MMUCTR read and write on exception entry
An AM34 erratum requires MMUCTR read and write on entry to certain exceptions,
prior to EPSW.NMID being cleared to allow NMIs to happen.
Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'arch/mn10300')
-rw-r--r-- | arch/mn10300/Kconfig | 3 | ||||
-rw-r--r-- | arch/mn10300/kernel/entry.S | 8 | ||||
-rw-r--r-- | arch/mn10300/mm/tlb-mn10300.S | 32 |
3 files changed, 37 insertions, 6 deletions
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig index 21e2a53..dd7b570 100644 --- a/arch/mn10300/Kconfig +++ b/arch/mn10300/Kconfig @@ -20,6 +20,9 @@ config AM34_2 select MN10300_HAS_ATOMIC_OPS_UNIT select MN10300_HAS_CACHE_SNOOP +config ERRATUM_NEED_TO_RELOAD_MMUCTR + def_bool y if AM33_3 || AM34_2 + config MMU def_bool y diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S index b82ce7b..355f681 100644 --- a/arch/mn10300/kernel/entry.S +++ b/arch/mn10300/kernel/entry.S @@ -251,6 +251,10 @@ double_fault_loop: ENTRY(raw_bus_error) add -4,sp mov d0,(sp) +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d0 + mov d0,(MMUCTR) +#endif mov (BCBERR),d0 # what btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error beq __common_exception_aux # it wasn't @@ -282,6 +286,10 @@ ENTRY(nmi_handler) ENTRY(__common_exception) add -4,sp mov d0,(sp) +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d0 + mov d0,(MMUCTR) +#endif __common_exception_aux: mov (TBR),d0 diff --git a/arch/mn10300/mm/tlb-mn10300.S b/arch/mn10300/mm/tlb-mn10300.S index 7095147..ccf6229 100644 --- a/arch/mn10300/mm/tlb-mn10300.S +++ b/arch/mn10300/mm/tlb-mn10300.S @@ -27,7 +27,6 @@ ############################################################################### .type itlb_miss,@function ENTRY(itlb_miss) - and ~EPSW_NMID,epsw #ifdef CONFIG_GDBSTUB movm [d2,d3,a2],(sp) #else @@ -38,6 +37,12 @@ ENTRY(itlb_miss) nop #endif +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d2 + mov d2,(MMUCTR) +#endif + + and ~EPSW_NMID,epsw mov (IPTEU),d3 mov (PTBR),a2 mov d3,d2 @@ -79,7 +84,6 @@ itlb_miss_fault: ############################################################################### .type dtlb_miss,@function ENTRY(dtlb_miss) - and ~EPSW_NMID,epsw #ifdef CONFIG_GDBSTUB movm [d2,d3,a2],(sp) #else @@ -90,6 +94,12 @@ ENTRY(dtlb_miss) nop #endif +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d2 + mov d2,(MMUCTR) +#endif + + and ~EPSW_NMID,epsw mov (DPTEU),d3 mov (PTBR),a2 mov d3,d2 @@ -130,9 +140,15 @@ dtlb_miss_fault: ############################################################################### .type itlb_aerror,@function ENTRY(itlb_aerror) - and ~EPSW_NMID,epsw add -4,sp SAVE_ALL + +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d1 + mov d1,(MMUCTR) +#endif + + and ~EPSW_NMID,epsw add -4,sp # need to pass three params # calculate the fault code @@ -148,7 +164,6 @@ ENTRY(itlb_aerror) clr d0 mov d0,(IPTEL) - and ~EPSW_NMID,epsw or EPSW_IE,epsw mov fp,d0 call do_page_fault[],0 # do_page_fault(regs,code,addr @@ -163,10 +178,16 @@ ENTRY(itlb_aerror) ############################################################################### .type dtlb_aerror,@function ENTRY(dtlb_aerror) - and ~EPSW_NMID,epsw add -4,sp SAVE_ALL + +#if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR) + mov (MMUCTR),d1 + mov d1,(MMUCTR) +#endif + add -4,sp # need to pass three params + and ~EPSW_NMID,epsw # calculate the fault code movhu (MMUFCR_DFC),d1 @@ -180,7 +201,6 @@ ENTRY(dtlb_aerror) clr d0 mov d0,(DPTEL) - and ~EPSW_NMID,epsw or EPSW_IE,epsw mov fp,d0 call do_page_fault[],0 # do_page_fault(regs,code,addr |