From: Peng Fan <peng....@nxp.com>
Add helper functions to identify different armv8 variants.
Signed-off-by: Peng Fan <peng....@nxp.com>
Reviewed-by: Anatolij Gustschin <ag...@denx.de>
Cc: Stefano Babic <sba...@denx.de>
---
arch/arm/include/asm/armv8/cpu.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
create mode 100644 arch/arm/include/asm/armv8/cpu.h
diff --git a/arch/arm/include/asm/armv8/cpu.h b/arch/arm/include/asm/armv8/cpu.h
new file mode 100644
index 0000000000..40d54dc85a
--- /dev/null
+++ b/arch/arm/include/asm/armv8/cpu.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2018 NXP
+ */
+
+#define MIDR_PARTNUM_CORTEX_A35 0xD04
+#define MIDR_PARTNUM_CORTEX_A53 0xD03
+#define MIDR_PARTNUM_CORTEX_A72 0xD08
+#define MIDR_PARTNUM_SHIFT 0x4
+#define MIDR_PARTNUM_MASK (0xFFF << 0x4)
+
+static inline unsigned int read_midr(void)
+{
+ unsigned long val;
+
+ asm volatile("mrs %0, midr_el1" : "=r" (val));
+
+ return val;
+}
+
+#define is_cortex_a35() (((read_midr() & MIDR_PARTNUM_MASK) >> \
+ MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A35)
+#define is_cortex_a53() (((read_midr() & MIDR_PARTNUM_MASK) >> \
+ MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A53)
+#define is_cortex_a72() (((read_midr() & MIDR_PARTNUM_MASK) >>\
+ MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A72)
--
2.17.1
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