diff options
Diffstat (limited to 'arch/arm/mm/proc-v6.S')
-rw-r--r-- | arch/arm/mm/proc-v6.S | 58 |
1 files changed, 26 insertions, 32 deletions
diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S index 1d2b8451bf25..a923aa0fd00d 100644 --- a/arch/arm/mm/proc-v6.S +++ b/arch/arm/mm/proc-v6.S @@ -56,6 +56,11 @@ ENTRY(cpu_v6_proc_fin) */ .align 5 ENTRY(cpu_v6_reset) + mrc p15, 0, r1, c1, c0, 0 @ ctrl register + bic r1, r1, #0x1 @ ...............m + mcr p15, 0, r1, c1, c0, 0 @ disable MMU + mov r1, #0 + mcr p15, 0, r1, c7, c5, 4 @ ISB mov pc, r0 /* @@ -164,16 +169,9 @@ ENDPROC(cpu_v6_do_resume) cpu_resume_l1_flags: ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP) ALT_UP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP) -#else -#define cpu_v6_do_suspend 0 -#define cpu_v6_do_resume 0 #endif - - .type cpu_v6_name, #object -cpu_v6_name: - .asciz "ARMv6-compatible processor" - .size cpu_v6_name, . - cpu_v6_name + string cpu_v6_name, "ARMv6-compatible processor" .align @@ -225,6 +223,22 @@ __v6_setup: mrc p15, 0, r0, c1, c0, 0 @ read control register bic r0, r0, r5 @ clear bits them orr r0, r0, r6 @ set them +#ifdef CONFIG_ARM_ERRATA_364296 + /* + * Workaround for the 364296 ARM1136 r0p2 erratum (possible cache data + * corruption with hit-under-miss enabled). The conditional code below + * (setting the undocumented bit 31 in the auxiliary control register + * and the FI bit in the control register) disables hit-under-miss + * without putting the processor into full low interrupt latency mode. + */ + ldr r6, =0x4107b362 @ id for ARM1136 r0p2 + mrc p15, 0, r5, c0, c0, 0 @ get processor id + teq r5, r6 @ check for the faulty core + mrceq p15, 0, r5, c1, c0, 1 @ load aux control reg + orreq r5, r5, #(1 << 31) @ set the undocumented bit 31 + mcreq p15, 0, r5, c1, c0, 1 @ write aux control reg + orreq r0, r0, #(1 << 21) @ low interrupt latency configuration +#endif mov pc, lr @ return to head.S:__ret /* @@ -239,33 +253,13 @@ v6_crval: __INITDATA - .type v6_processor_functions, #object -ENTRY(v6_processor_functions) - .word v6_early_abort - .word v6_pabort - .word cpu_v6_proc_init - .word cpu_v6_proc_fin - .word cpu_v6_reset - .word cpu_v6_do_idle - .word cpu_v6_dcache_clean_area - .word cpu_v6_switch_mm - .word cpu_v6_set_pte_ext - .word cpu_v6_suspend_size - .word cpu_v6_do_suspend - .word cpu_v6_do_resume - .size v6_processor_functions, . - v6_processor_functions + @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) + define_processor_functions v6, dabort=v6_early_abort, pabort=v6_pabort, suspend=1 .section ".rodata" - .type cpu_arch_name, #object -cpu_arch_name: - .asciz "armv6" - .size cpu_arch_name, . - cpu_arch_name - - .type cpu_elf_name, #object -cpu_elf_name: - .asciz "v6" - .size cpu_elf_name, . - cpu_elf_name + string cpu_arch_name, "armv6" + string cpu_elf_name, "v6" .align .section ".proc.info.init", #alloc, #execinstr |