Cortex_hercules: Introduce preliminary cpu support

Change-Id: Iab767e9937f5c6c8150953fcdc3b37e8ee83fa63
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>

include/lib/cpus/aarch64/cortex_hercules.h

+/*
+ * Copyright (c) 2019, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CORTEX_HERCULES_H
+#define CORTEX_HERCULES_H
+
+#include <lib/utils_def.h>
+
+#define CORTEX_HERCULES_MIDR					U(0x410FD410)
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions.
+ ******************************************************************************/
+#define CORTEX_HERCULES_CPUECTLR_EL1				S3_0_C15_C1_4
+
+/*******************************************************************************
+ * CPU Power Control register specific definitions
+ ******************************************************************************/
+#define CORTEX_HERCULES_CPUPWRCTLR_EL1				S3_0_C15_C2_7
+#define CORTEX_HERCULES_CPUPWRCTLR_EL1_CORE_PWRDN_EN_BIT	U(1)
+
+#endif /* CORTEX_HERCULES_H */

lib/cpus/aarch64/cortex_hercules.S

+/*
+ * Copyright (c) 2019, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <common/bl_common.h>
+#include <cortex_hercules.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "cortex_hercules must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+	/* ---------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ---------------------------------------------
+	 */
+func cortex_hercules_core_pwr_dwn
+	/* ---------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------
+	 */
+	mrs	x0, CORTEX_HERCULES_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_HERCULES_CPUPWRCTLR_EL1_CORE_PWRDN_EN_BIT
+	msr	CORTEX_HERCULES_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_hercules_core_pwr_dwn
+
+	/*
+	 * Errata printing function for cortex_hercules. Must follow AAPCS.
+	 */
+#if REPORT_ERRATA
+func cortex_hercules_errata_report
+	ret
+endfunc cortex_hercules_errata_report
+#endif
+
+	/* ---------------------------------------------
+	 * This function provides cortex_hercules 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_hercules_regs, "aS"
+cortex_hercules_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_hercules_cpu_reg_dump
+	adr	x6, cortex_hercules_regs
+	mrs	x8, CORTEX_HERCULES_CPUECTLR_EL1
+	ret
+endfunc cortex_hercules_cpu_reg_dump
+
+declare_cpu_ops cortex_hercules, CORTEX_HERCULES_MIDR, \
+	CPU_NO_RESET_FUNC, \
+	cortex_hercules_core_pwr_dwn

plat/arm/board/fvp/platform.mk

@@ -112,7 +112,8 @@ else
 					lib/cpus/aarch64/cortex_a77.S		\
 					lib/cpus/aarch64/neoverse_n1.S		\
 					lib/cpus/aarch64/neoverse_e1.S		\
-					lib/cpus/aarch64/neoverse_zeus.S
+					lib/cpus/aarch64/neoverse_zeus.S	\
+					lib/cpus/aarch64/cortex_hercules.S
 	# AArch64/AArch32
 	else
 		FVP_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a55.S		\