Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/mach-mmp/platsmp.c b/arch/arm/mach-mmp/platsmp.c
new file mode 100644
index 000000000..c99405469
--- /dev/null
+++ b/arch/arm/mach-mmp/platsmp.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019 Lubomir Rintel <lkundrak@v3.sk>
+ */
+#include <linux/io.h>
+#include <asm/smp_scu.h>
+#include <asm/smp.h>
+#include "addr-map.h"
+
+#define SW_BRANCH_VIRT_ADDR	CIU_REG(0x24)
+
+static int mmp3_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	/*
+	 * Apparently, the boot ROM on the second core spins on this
+	 * register becoming non-zero and then jumps to the address written
+	 * there. No IPIs involved.
+	 */
+	__raw_writel(__pa_symbol(secondary_startup), SW_BRANCH_VIRT_ADDR);
+	return 0;
+}
+
+static void mmp3_smp_prepare_cpus(unsigned int max_cpus)
+{
+	scu_enable(SCU_VIRT_BASE);
+}
+
+static const struct smp_operations mmp3_smp_ops __initconst = {
+	.smp_prepare_cpus	= mmp3_smp_prepare_cpus,
+	.smp_boot_secondary	= mmp3_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(mmp3_smp, "marvell,mmp3-smp", &mmp3_smp_ops);