armv8: ls2080a: Implement workaround for core errata 829520, 833471

829520: Code bounded by indirect conditional branch might corrupt
instruction stream.
Workaround: Set CPUACTLR_EL1[4] = 1'b1 to disable the Indirect
Predictor.

833471: VMSR FPSCR functional failure or deadlock.
Workaround: Set CPUACTLR[38] to 1, which forces FPSCR write flush.

Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/start.S

@@ -168,6 +168,25 @@ apply_a57_core_errata:
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 #endif
 
+#ifdef CONFIG_ARM_ERRATA_833471
+	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
+	/* FPSCR write flush.
+	 * Note that in some cases where a flush is unnecessary this
+	    could impact performance. */
+	orr	x0, x0, #1 << 38
+	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
+#endif
+
+#ifdef CONFIG_ARM_ERRATA_829520
+	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
+	/* Disable Indirect Predictor bit will prevent this erratum
+	    from occurring
+	 * Note that in some cases where a flush is unnecessary this
+	    could impact performance. */
+	orr	x0, x0, #1 << 4
+	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
+#endif
+
 #ifdef CONFIG_ARM_ERRATA_833069
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Disable Enable Invalidates of BTB bit */

arch/arm/include/asm/arch-fsl-layerscape/config.h

@@ -121,6 +121,10 @@
 #define CONFIG_SYS_FSL_ERRATUM_A009663
 #define CONFIG_SYS_FSL_ERRATUM_A009942
 
+/* ARM A57 CORE ERRATA */
+#define CONFIG_ARM_ERRATA_829520
+#define CONFIG_ARM_ERRATA_833471
+
 #elif defined(CONFIG_LS1043A)
 #define CONFIG_MAX_CPUS				4
 #define CONFIG_SYS_CACHELINE_SIZE		64