cpu: add support for Demeter CPU
This patch adds the basic CPU library code to support the Demeter
CPU. This CPU is based on the Makalu-ELP core so that CPU lib code
was adapted to create this patch.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ib5740b748008a72788c557f0654d8d5e9ec0bb7f
diff --git a/lib/cpus/aarch64/cortex_demeter.S b/lib/cpus/aarch64/cortex_demeter.S
new file mode 100644
index 0000000..9ad8b86
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_demeter.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_demeter.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Cortex Demeter must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Cortex Demeter supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+ /* ----------------------------------------------------
+ * HW will do the cache maintenance while powering down
+ * ----------------------------------------------------
+ */
+func cortex_demeter_core_pwr_dwn
+ /* ---------------------------------------------------
+ * Enable CPU power down bit in power control register
+ * ---------------------------------------------------
+ */
+ mrs x0, CORTEX_DEMETER_CPUPWRCTLR_EL1
+ orr x0, x0, #CORTEX_DEMETER_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+ msr CORTEX_DEMETER_CPUPWRCTLR_EL1, x0
+ isb
+ ret
+endfunc cortex_demeter_core_pwr_dwn
+
+#if REPORT_ERRATA
+/*
+ * Errata printing function for Cortex Demeter. Must follow AAPCS.
+ */
+func cortex_demeter_errata_report
+ ret
+endfunc cortex_demeter_errata_report
+#endif
+
+func cortex_demeter_reset_func
+ /* Disable speculative loads */
+ msr SSBS, xzr
+ isb
+ ret
+endfunc cortex_demeter_reset_func
+
+ /* ---------------------------------------------
+ * This function provides Cortex Demeter-
+ * 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_demeter_regs, "aS"
+cortex_demeter_regs: /* The ascii list of register names to be reported */
+ .asciz "cpuectlr_el1", ""
+
+func cortex_demeter_cpu_reg_dump
+ adr x6, cortex_demeter_regs
+ mrs x8, CORTEX_DEMETER_CPUECTLR_EL1
+ ret
+endfunc cortex_demeter_cpu_reg_dump
+
+declare_cpu_ops cortex_demeter, CORTEX_DEMETER_MIDR, \
+ cortex_demeter_reset_func, \
+ cortex_demeter_core_pwr_dwn