omap4: l2x0: Override the default l2x0_disable

The machine_kexec() calls outer_disable which can crash on OMAP4
becasue of trustzone restrictions.

This patch overrides the default l2x0_disable with a OMAP4
specific implementation taking care of trustzone

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>

arch/arm/mach-omap2/omap4-common.c

@@ -44,6 +44,13 @@ void __init gic_init_irq(void)
 }
 
 #ifdef CONFIG_CACHE_L2X0
+
+static void omap4_l2x0_disable(void)
+{
+	/* Disable PL310 L2 Cache controller */
+	omap_smc1(0x102, 0x0);
+}
+
 static int __init omap_l2_cache_init(void)
 {
 	/*
@@ -66,6 +73,12 @@ static int __init omap_l2_cache_init(void)
 	 */
 	l2x0_init(l2cache_base, 0x0e050000, 0xc0000fff);
 
+	/*
+	 * Override default outer_cache.disable with a OMAP4
+	 * specific one
+	*/
+	outer_cache.disable = omap4_l2x0_disable;
+
 	return 0;
 }
 early_initcall(omap_l2_cache_init);