Add Makalu ELP CPU lib

Add basic support for Makalu ELP processor core.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: I7b1ddbb8dd43326ecb8ff188f6f8fcf239826a93

include/lib/cpus/aarch64/cortex_makalu_elp.h

+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef CORTEX_MAKALU_ELP_H
+#define CORTEX_MAKALU_ELP_H
+
+#define CORTEX_MAKALU_ELP_MIDR					U(0x410FD4E0)
+
+/*******************************************************************************
+ * CPU Extended Control register specific definitions
+ ******************************************************************************/
+#define CORTEX_MAKALU_ELP_CPUECTLR_EL1				S3_0_C15_C1_4
+
+/*******************************************************************************
+ * CPU Power Control register specific definitions
+ ******************************************************************************/
+#define CORTEX_MAKALU_ELP_CPUPWRCTLR_EL1			S3_0_C15_C2_7
+#define CORTEX_MAKALU_ELP_CPUPWRCTLR_EL1_CORE_PWRDN_BIT		U(1)
+
+#endif /* CORTEX_MAKALU_ELP_H */

lib/cpus/aarch64/cortex_makalu_elp.S

+/*
+ * Copyright (c) 2021, 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_makalu_elp.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Cortex Makalu ELP must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex Makalu ELP supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+	/* ----------------------------------------------------
+	 * HW will do the cache maintenance while powering down
+	 * ----------------------------------------------------
+	 */
+func cortex_makalu_elp_core_pwr_dwn
+	/* ---------------------------------------------------
+	 * Enable CPU power down bit in power control register
+	 * ---------------------------------------------------
+	 */
+	mrs	x0, CORTEX_MAKALU_ELP_CPUPWRCTLR_EL1
+	orr	x0, x0, #CORTEX_MAKALU_ELP_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+	msr	CORTEX_MAKALU_ELP_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc cortex_makalu_elp_core_pwr_dwn
+
+#if REPORT_ERRATA
+/*
+ * Errata printing function for Cortex Makalu ELP. Must follow AAPCS.
+ */
+func cortex_makalu_elp_errata_report
+	ret
+endfunc cortex_makalu_elp_errata_report
+#endif
+
+func cortex_makalu_elp_reset_func
+	/* Disable speculative loads */
+	msr	SSBS, xzr
+	isb
+	ret
+endfunc cortex_makalu_elp_reset_func
+
+	/* ---------------------------------------------
+	 * This function provides Cortex Makalu ELP-
+	 * 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_makalu_elp_regs, "aS"
+cortex_makalu_elp_regs:  /* The ascii list of register names to be reported */
+	.asciz	"cpuectlr_el1", ""
+
+func cortex_makalu_elp_cpu_reg_dump
+	adr	x6, cortex_makalu_elp_regs
+	mrs	x8, CORTEX_MAKALU_ELP_CPUECTLR_EL1
+	ret
+endfunc cortex_makalu_elp_cpu_reg_dump
+
+declare_cpu_ops cortex_makalu_elp, CORTEX_MAKALU_ELP_MIDR, \
+	cortex_makalu_elp_reset_func, \
+	cortex_makalu_elp_core_pwr_dwn

plat/arm/board/arm_fpga/platform.mk

@@ -69,7 +69,8 @@ else
 				lib/cpus/aarch64/cortex_a65ae.S		\
 				lib/cpus/aarch64/cortex_klein.S		\
 				lib/cpus/aarch64/cortex_matterhorn.S	\
-				lib/cpus/aarch64/cortex_makalu.S
+				lib/cpus/aarch64/cortex_makalu.S	\
+				lib/cpus/aarch64/cortex_makalu_elp.S
 
 # AArch64/AArch32 cores
 	FPGA_CPU_LIBS	+=	lib/cpus/aarch64/cortex_a55.S	\

plat/arm/board/fvp/platform.mk

@@ -131,9 +131,10 @@ else
 					lib/cpus/aarch64/neoverse_e1.S		\
 					lib/cpus/aarch64/neoverse_v1.S		\
 					lib/cpus/aarch64/cortex_a78_ae.S	\
-					lib/cpus/aarch64/cortex_klein.S	        \
+					lib/cpus/aarch64/cortex_klein.S		\
 					lib/cpus/aarch64/cortex_matterhorn.S	\
 					lib/cpus/aarch64/cortex_makalu.S	\
+					lib/cpus/aarch64/cortex_makalu_elp.S	\
 					lib/cpus/aarch64/cortex_a65.S		\
 					lib/cpus/aarch64/cortex_a65ae.S
 	endif