Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/headsmp-scu.S b/arch/arm/mach-shmobile/headsmp-scu.S
new file mode 100644
index 0000000000..e892ee794d
--- /dev/null
+++ b/arch/arm/mach-shmobile/headsmp-scu.S
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Shared SCU setup for mach-shmobile
+ *
+ * Copyright (C) 2012 Bastian Hecht
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/page.h>
+
+/*
+ * Boot code for secondary CPUs.
+ *
+ * First we turn on L1 cache coherency for our CPU. Then we jump to
+ * secondary_startup that invalidates the cache and hands over control
+ * to the common ARM startup code.
+ */
+ENTRY(shmobile_boot_scu)
+					@ r0 = SCU base address
+	mrc     p15, 0, r1, c0, c0, 5	@ read MPIDR
+	and	r1, r1, #3		@ mask out cpu ID
+	lsl	r1, r1, #3		@ we will shift by cpu_id * 8 bits
+	ldr	r2, [r0, #8]		@ SCU Power Status Register
+	mov	r3, #3
+	lsl	r3, r3, r1
+	bic	r2, r2, r3		@ Clear bits of our CPU (Run Mode)
+	str	r2, [r0, #8]		@ write back
+
+	b	secondary_startup
+ENDPROC(shmobile_boot_scu)