feat(cpus): add support for Gelas CPU
This patch adds the necessary CPU library code to support the Gelas CPU
Change-Id: I13ec4a8bb7055c1ebd0796a4a1378983d930fcb3
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
diff --git a/lib/cpus/aarch64/cortex_gelas.S b/lib/cpus/aarch64/cortex_gelas.S
new file mode 100644
index 0000000..e0d20a9
--- /dev/null
+++ b/lib/cpus/aarch64/cortex_gelas.S
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2023, 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_gelas.h>
+#include <cpu_macros.S>
+#include <plat_macros.S>
+
+/* Hardware handled coherency */
+#if HW_ASSISTED_COHERENCY == 0
+#error "Gelas must be compiled with HW_ASSISTED_COHERENCY enabled"
+#endif
+
+/* 64-bit only core */
+#if CTX_INCLUDE_AARCH32_REGS == 1
+#error "Gelas supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
+#endif
+
+cpu_reset_func_start cortex_gelas
+ /* ----------------------------------------------------
+ * Disable speculative loads
+ * ----------------------------------------------------
+ */
+ msr SSBS, xzr
+cpu_reset_func_end cortex_gelas
+
+ /* ----------------------------------------------------
+ * HW will do the cache maintenance while powering down
+ * ----------------------------------------------------
+ */
+func cortex_gelas_core_pwr_dwn
+ /* ---------------------------------------------------
+ * Disable SME
+ * ---------------------------------------------------
+ */
+ msr CORTEX_GELAS_SVCRSM, xzr
+ msr CORTEX_GELAS_SVCRZA, xzr
+
+ /* ---------------------------------------------------
+ * Enable CPU power down bit in power control register
+ * ---------------------------------------------------
+ */
+ sysreg_bit_set CORTEX_GELAS_CPUPWRCTLR_EL1, \
+ CORTEX_GELAS_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
+ isb
+ ret
+endfunc cortex_gelas_core_pwr_dwn
+
+errata_report_shim cortex_gelas
+
+ /* ---------------------------------------------
+ * This function provides Gelas 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_gelas_regs, "aS"
+cortex_gelas_regs: /* The ASCII list of register names to be reported */
+ .asciz "imp_cpuectlr_el1", ""
+
+func cortex_gelas_cpu_reg_dump
+ adr x6, cortex_gelas_regs
+ mrs x8, CORTEX_GELAS_IMP_CPUECTLR_EL1
+ ret
+endfunc cortex_gelas_cpu_reg_dump
+
+declare_cpu_ops cortex_gelas, CORTEX_GELAS_MIDR, \
+ cortex_gelas_reset_func, \
+ cortex_gelas_core_pwr_dwn