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authorJayachandran C <jchandra@broadcom.com>2015-01-09 13:43:20 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 18:21:52 +0300
commit5084e93dfeebd171e0ad02cc7ea560364a7f80b3 (patch)
tree1cd86fe1fb2f0da8888c562fa926033c16963e0b /arch/mips/netlogic
parentb3b73ae62ca82744c92c1c2d49381add26d0a8bd (diff)
downloadlinux-5084e93dfeebd171e0ad02cc7ea560364a7f80b3.tar.xz
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>
Diffstat (limited to 'arch/mips/netlogic')
-rw-r--r--arch/mips/netlogic/common/reset.S20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/mips/netlogic/common/reset.S b/arch/mips/netlogic/common/reset.S
index 701c4bcb9e47..e3e518974e0b 100644
--- a/arch/mips/netlogic/common/reset.S
+++ b/arch/mips/netlogic/common/reset.S
@@ -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