Add support for Cortex-Ares and Cortex-A76 CPUs

Both Cortex-Ares and Cortex-A76 CPUs use the ARM DynamIQ Shared Unit
(DSU).  The power-down and power-up sequences are therefore mostly
managed in hardware, and required software operations are simple.

Change-Id: I3a9447b5bdbdbc5ed845b20f6564d086516fa161
Signed-off-by: Isla Mitchell <isla.mitchell@arm.com>

include/lib/cpus/aarch64/cortex_a76.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_A76_H__
+#define __CORTEX_A76_H__
+
+/* Cortex-A76 MIDR for revision 0 */
+#define CORTEX_A76_MIDR		0x410fd0b0
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_A76_CPUPWRCTLR_EL1	S3_0_C15_C2_7
+#define CORTEX_A76_CPUECTLR_EL1	S3_0_C15_C1_4
+
+/* Definitions of register field mask in CORTEX_A76_CPUPWRCTLR_EL1 */
+#define CORTEX_A76_CORE_PWRDN_EN_MASK	0x1
+
+#endif /* __CORTEX_A76_H__ */

include/lib/cpus/aarch64/cortex_ares.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __CORTEX_ARES_H__
+#define __CORTEX_ARES_H__
+
+/* Cortex-ARES MIDR for revision 0 */
+#define CORTEX_ARES_MIDR		0x410fd0c0
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_ARES_CPUPWRCTLR_EL1	S3_0_C15_C2_7
+#define CORTEX_ARES_CPUECTLR_EL1	S3_0_C15_C1_4
+
+/* Definitions of register field mask in CORTEX_ARES_CPUPWRCTLR_EL1 */
+#define CORTEX_ARES_CORE_PWRDN_EN_MASK	0x1
+
+#endif /* __CORTEX_ARES_H__ */

lib/cpus/aarch64/cortex_a76.S

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl_common.h>
+#include <cortex_a76.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+	/* ---------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ---------------------------------------------
+	 */
+func cortex_a76_core_pwr_dwn
+	/* ---------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------
+	 */
+	mrs	x0, CORTEX_A76_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_A76_CORE_PWRDN_EN_MASK
+	msr	CORTEX_A76_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_a76_core_pwr_dwn
+
+	/* ---------------------------------------------
+	 * This function provides cortex_a76 specific
+	 * register information for crash reporting.
+	 * It needs to return with x6 pointing to
+	 * a list of register names in ascii and
+	 * x8 - x15 having values of registers to be
+	 * reported.
+	 * ---------------------------------------------
+	 */
+.section .rodata.cortex_a76_regs, "aS"
+cortex_a76_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_a76_cpu_reg_dump
+	adr	x6, cortex_a76_regs
+	mrs	x8, CORTEX_A76_CPUECTLR_EL1
+	ret
+endfunc cortex_a76_cpu_reg_dump
+
+declare_cpu_ops cortex_a76, CORTEX_A76_MIDR, \
+	CPU_NO_RESET_FUNC, \
+	cortex_a76_core_pwr_dwn

lib/cpus/aarch64/cortex_ares.S

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl_common.h>
+#include <cortex_ares.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+	/* ---------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ---------------------------------------------
+	 */
+func cortex_ares_core_pwr_dwn
+	/* ---------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------
+	 */
+	mrs	x0, CORTEX_ARES_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_ARES_CORE_PWRDN_EN_MASK
+	msr	CORTEX_ARES_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_ares_core_pwr_dwn
+
+	/* ---------------------------------------------
+	 * This function provides cortex_ares specific
+	 * register information for crash reporting.
+	 * It needs to return with x6 pointing to
+	 * a list of register names in ascii and
+	 * x8 - x15 having values of registers to be
+	 * reported.
+	 * ---------------------------------------------
+	 */
+.section .rodata.cortex_ares_regs, "aS"
+cortex_ares_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_ares_cpu_reg_dump
+	adr	x6, cortex_ares_regs
+	mrs	x8, CORTEX_ARES_CPUECTLR_EL1
+	ret
+endfunc cortex_ares_cpu_reg_dump
+
+declare_cpu_ops cortex_ares, CORTEX_ARES_MIDR, \
+	CPU_NO_RESET_FUNC, \
+	cortex_ares_core_pwr_dwn

plat/arm/board/fvp/platform.mk

@@ -114,7 +114,9 @@ FVP_CPU_LIBS		+=	lib/cpus/aarch64/cortex_a35.S			\
 				lib/cpus/aarch64/cortex_a57.S			\
 				lib/cpus/aarch64/cortex_a72.S			\
 				lib/cpus/aarch64/cortex_a73.S			\
-				lib/cpus/aarch64/cortex_a75.S
+				lib/cpus/aarch64/cortex_a75.S			\
+				lib/cpus/aarch64/cortex_a76.S			\
+				lib/cpus/aarch64/cortex_ares.S
 else
 FVP_CPU_LIBS		+=	lib/cpus/aarch32/cortex_a32.S
 endif