[U-Boot] [PATCH 2/2] arm: rmobile: r8a7794: Skip initialize L2 cache

[Nobuhiro Iwamatsu]

rmobile/lowlevel_init_ca15.S are common in r8a7790, r8a7791 and r8a7794 of
rmobile SoCs.  The initialize L2 cache in lowlevel_init_ca15.S only needed
for Cortex-A15. The r8a7794 is Cortex-A7, not Cortex-A15.
This adds Skip to initialize L2 cache when r8a7794.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com>
---
 arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S b/arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
index 5820e1a..879e0e0 100644
--- a/arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
+++ b/arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
@@ -35,6 +35,13 @@ do_cpu_waiting:
  */
 	.align  4
 do_lowlevel_init:
+	ldr	r2, =0xFF000044		/* PRR */
+	ldr	r1, [r2]
+	and	r1, r1, #0x7F00
+	lsrs	r1, r1, #8
+	cmp	r1, #0x4C		/* 0x4C is ID of r8a7794 */
+	beq	_exit_init_l2_a15
+
 	/* surpress wfe if ca15 */
 	tst r4, #4
 	mrceq p15, 0, r0, c1, c0, 1	/* actlr */
-- 
2.0.0