cpus: add Matterhorn ELP ARM cpu library
Change-Id: Ie1acde619a5b21e09717c0e80befb6d53fd16607
Signed-off-by: Usama Arif <usama.arif@arm.com>
diff --git a/lib/cpus/aarch64/cortex_matterhorn_elp_arm.S b/lib/cpus/aarch64/cortex_matterhorn_elp_arm.S
new file mode 100644
index 0000000..b0f81a2
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_matterhorn_elp_arm.S
@@ -0,0 +1,77 @@
+/*
+ * 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_matterhorn_elp_arm.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Cortex Matterhorn ELP ARM must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex Matterhorn ELP ARM supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+ /* ----------------------------------------------------
+ * HW will do the cache maintenance while powering down
+ * ----------------------------------------------------
+ */
+func cortex_matterhorn_elp_arm_core_pwr_dwn
+ /* ---------------------------------------------------
+ * Enable CPU power down bit in power control register
+ * ---------------------------------------------------
+ */
+ mrs x0, CORTEX_MATTERHORN_ELP_ARM_CPUPWRCTLR_EL1
+ orr x0, x0, #CORTEX_MATTERHORN_ELP_ARM_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+ msr CORTEX_MATTERHORN_ELP_ARM_CPUPWRCTLR_EL1, x0
+ isb
+ ret
+endfunc cortex_matterhorn_elp_arm_core_pwr_dwn
+
+ /*
+ * Errata printing function for Cortex Matterhorn_elp_arm. Must follow AAPCS.
+ */
+#if REPORT_ERRATA
+func cortex_matterhorn_elp_arm_errata_report
+ ret
+endfunc cortex_matterhorn_elp_arm_errata_report
+#endif
+
+func cortex_matterhorn_elp_arm_reset_func
+ /* Disable speculative loads */
+ msr SSBS, xzr
+ isb
+ ret
+endfunc cortex_matterhorn_elp_arm_reset_func
+
+ /* ---------------------------------------------
+ * This function provides Cortex-Matterhorn_elp_arm 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_matterhorn_elp_arm_regs, "aS"
+cortex_matterhorn_elp_arm_regs: /* The ascii list of register names to be reported */
+ .asciz "cpuectlr_el1", ""
+
+func cortex_matterhorn_elp_arm_cpu_reg_dump
+ adr x6, cortex_matterhorn_elp_arm_regs
+ mrs x8, CORTEX_MATTERHORN_ELP_ARM_CPUECTLR_EL1
+ ret
+endfunc cortex_matterhorn_elp_arm_cpu_reg_dump
+
+declare_cpu_ops cortex_matterhorn_elp_arm, CORTEX_MATTERHORN_ELP_ARM_MIDR, \
+ cortex_matterhorn_elp_arm_reset_func, \
+ cortex_matterhorn_elp_arm_core_pwr_dwn