arm: rmobile: r8a7794: Enable SMP mode of Auxiliary Control Register

r8a7794 uses ARM SoC of CA7 base. If we want to use dcache on CA7, we
need to enable SMP bit of Auxiliary Control Register.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S

@@ -40,7 +40,7 @@ do_lowlevel_init:
 	and	r1, r1, #0x7F00
 	lsrs	r1, r1, #8
 	cmp	r1, #0x4C		/* 0x4C is ID of r8a7794 */
-	beq	_exit_init_l2_a15
+	beq	_enable_actlr_smp
 
 	/* surpress wfe if ca15 */
 	tst r4, #4
@@ -64,6 +64,16 @@ do_lowlevel_init:
 	orrne r0, r0, #0x20		/* L2CTLR[5] */
 #endif
 	mcrne p15, 1, r0, c9, c0, 2
+
+	b	_exit_init_l2_a15
+
+_enable_actlr_smp: /* R8A7794 only (CA7) */
+#ifndef CONFIG_DCACHE_OFF
+	mrc    p15, 0, r0, c1, c0, 1
+	orr    r0, r0, #0x40
+	mcr    p15, 0, r0, c1, c0, 1
+#endif
+
 _exit_init_l2_a15:
 	ldr	r3, =(CONFIG_SYS_INIT_SP_ADDR)
 	sub	sp, r3, #4