fix(errata): workaround for Cortex-A510 erratum 2288014

Cortex-A510 erratum 2288014 is a Cat B erratum that applies to revisions
r0p0, r0p1, r0p2, r0p3 and r1p0, and is fixed in r1p1.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN2397239

Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I875519ff55be90244cc3d3a7e9f7abad0fc3c2b8

docs/design/cpu-specific-build-macros.rst

@@ -480,6 +480,10 @@ For Cortex-A510, the following errata build flags are defined :
    Cortex-A510 CPU. This needs to be enabled only for revision r0p0, it is
    fixed in r0p1.
 
+-  ``ERRATA_A510_2288014``: This applies errata 2288014 workaround to
+   Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1,
+   r0p2, r0p3 and r1p0, it is fixed in r1p1.
+
 DSU Errata Workarounds
 ----------------------
 

include/lib/cpus/aarch64/cortex_a510.h

@@ -25,4 +25,9 @@
  ******************************************************************************/
 #define CORTEX_A510_CMPXACTLR_EL1				S3_0_C15_C1_3
 
+/*******************************************************************************
+ * Auxiliary control register specific definitions
+ ******************************************************************************/
+#define CORTEX_A510_CPUACTLR_EL1				S3_0_C15_C1_0
+
 #endif /* CORTEX_A510_H */

lib/cpus/aarch64/cortex_a510.S

@@ -50,6 +50,36 @@ func check_errata_1922240
 	b	cpu_rev_var_ls
 endfunc check_errata_1922240
 
+	/* --------------------------------------------------
+	 * Errata Workaround for Cortex-A510 Errata #2288014.
+	 * This applies only to revisions r0p0, r0p1, r0p2,
+	 * r0p3 and r1p0. (fixed in r1p1)
+	 * x0: variant[4:7] and revision[0:3] of current cpu.
+	 * Shall clobber: x0, x1, x17
+	 * --------------------------------------------------
+	 */
+func errata_cortex_a510_2288014_wa
+	/* Check workaround compatibility. */
+	mov	x17, x30
+	bl	check_errata_2288014
+	cbz	x0, 1f
+
+	/* Apply the workaround by setting IMP_CPUACTLR_EL1[18] = 0b1. */
+	mrs	x0, CORTEX_A510_CPUACTLR_EL1
+	mov	x1, #1
+	bfi	x0, x1, #18, #1
+	msr	CORTEX_A510_CPUACTLR_EL1, x0
+
+1:
+	ret	x17
+endfunc errata_cortex_a510_2288014_wa
+
+func check_errata_2288014
+	/* Applies to r1p0 and below */
+	mov	x1, #0x10
+	b	cpu_rev_var_ls
+endfunc check_errata_2288014
+
 	/* ----------------------------------------------------
 	 * HW will do the cache maintenance while powering down
 	 * ----------------------------------------------------
@@ -81,6 +111,7 @@ func cortex_a510_errata_report
 	 * checking functions of each errata.
 	 */
 	report_errata ERRATA_A510_1922240, cortex_a510, 1922240
+	report_errata ERRATA_A510_2288014, cortex_a510, 2288014
 
 	ldp	x8, x30, [sp], #16
 	ret
@@ -103,6 +134,11 @@ func cortex_a510_reset_func
 	bl	errata_cortex_a510_1922240_wa
 #endif
 
+#if ERRATA_A510_2288014
+	mov	x0, x18
+	bl	errata_cortex_a510_2288014_wa
+#endif
+
 	ret	x19
 endfunc cortex_a510_reset_func
 

lib/cpus/cpu-ops.mk

@@ -534,6 +534,11 @@ ERRATA_X2_2216384	?=0
 # to revision r0p0 of the Cortex-A510 cpu and is fixed in r0p1.
 ERRATA_A510_1922240	?=0
 
+# Flag to apply erratum 2288014 workaround during reset. This erratum applies
+# to revisions r0p0, r0p1, r0p2, r0p3 and r1p0 of the Cortex-A510 cpu and is
+# fixed in r1p1.
+ERRATA_A510_2288014	?=0
+
 # Flag to apply DSU erratum 798953. This erratum applies to DSUs revision r0p0.
 # Applying the workaround results in higher DSU power consumption on idle.
 ERRATA_DSU_798953	?=0
@@ -995,6 +1000,10 @@ $(eval $(call add_define,ERRATA_X2_2216384))
 $(eval $(call assert_boolean,ERRATA_A510_1922240))
 $(eval $(call add_define,ERRATA_A510_1922240))
 
+# Process ERRATA_A510_2288014 flag
+$(eval $(call assert_boolean,ERRATA_A510_2288014))
+$(eval $(call add_define,ERRATA_A510_2288014))
+
 # Process ERRATA_DSU_798953 flag
 $(eval $(call assert_boolean,ERRATA_DSU_798953))
 $(eval $(call add_define,ERRATA_DSU_798953))