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MIPS: Netlogic: Handle XLP hardware errata 

Core configuration register IFU_BRUB_RESERVE has to be setup to handle
a silicon errata which can result in a CPU hang.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8902/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C 2015-01-09 16:13:20 +05:30 committed by Ralf Baechle
parent b3b73ae62c
commit 5084e93dfe
2 changed files with 22 additions and 0 deletions
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2
arch/mips/include/asm/netlogic/xlp-hal/cpucontrol.h
View File

@ -46,6 +46,8 @@
#define CPU_BLOCKID_FPU 9
#define CPU_BLOCKID_MAP 10
#define IFU_BRUB_RESERVE 0x007
#define ICU_DEFEATURE 0x100
#define LSU_DEFEATURE 0x304

20
arch/mips/netlogic/common/reset.S
View File

@ -235,6 +235,26 @@ EXPORT(nlm_boot_siblings)
mfc0 v0, CP0_EBASE, 1
andi v0, 0x3ff /* v0 <- node/core */
/*
* Errata: to avoid potential live lock, setup IFU_BRUB_RESERVE
* when running 4 threads per core
*/
andi v1, v0, 0x3 /* v1 <- thread id */
bnez v1, 2f
nop
/* thread 0 of each core. */
li t0, CKSEG1ADDR(RESET_DATA_PHYS)
lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
subu t1, 0x3 /* 4-thread per core mode? */
bnez t1, 2f
nop
li t0, IFU_BRUB_RESERVE
li t1, 0x55
mtcr t1, t0
_ehb
2:
beqz v0, 4f /* boot cpu (cpuid == 0)? */
nop