diff options
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r-- | arch/arm/cpu/armv7/cp15.c | 6 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/start.S | 13 |
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/cp15.c b/arch/arm/cpu/armv7/cp15.c index 8ac81c9..b44c9f9 100644 --- a/arch/arm/cpu/armv7/cp15.c +++ b/arch/arm/cpu/armv7/cp15.c @@ -21,3 +21,9 @@ void __weak v7_arch_cp15_set_l2aux_ctrl(u32 l2actlr, u32 cpu_midr, { asm volatile ("mcr p15, 1, %0, c15, c0, 0\n\t" : : "r"(l2actlr)); } + +void __weak v7_arch_cp15_set_acr(u32 acr, u32 cpu_midr, u32 cpu_rev_comb, + u32 cpu_variant, u32 cpu_rev) +{ + asm volatile ("mcr p15, 0, %0, c1, c0, 1\n\t" : : "r"(acr)); +} diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 89637e2..8483687 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -189,6 +189,19 @@ ENTRY(cpu_init_cp15) skip_errata_798870: #endif +#ifdef CONFIG_ARM_ERRATA_454179 + cmp r2, #0x21 @ Only on < r2p1 + bge skip_errata_454179 + + mrc p15, 0, r0, c1, c0, 1 @ Read ACR + orr r0, r0, #(0x3 << 6) @ Set DBSM(BIT7) and IBE(BIT6) bits + push {r1-r5} @ Save the cpu info registers + bl v7_arch_cp15_set_acr + pop {r1-r5} @ Restore the cpu info - fall through + +skip_errata_454179: +#endif + mov pc, r5 @ back to my caller ENDPROC(cpu_init_cp15) |