ARM: aspeed: Enable SMP boot

machine-$(CONFIG_ARCH_ACTIONS)		+= actions

machine-$(CONFIG_ARCH_ALPINE)		+= alpine

machine-$(CONFIG_ARCH_ARTPEC)		+= artpec

machine-$(CONFIG_ARCH_ASPEED)           += aspeed

machine-$(CONFIG_ARCH_AT91)		+= at91

machine-$(CONFIG_ARCH_AXXIA)		+= axxia

machine-$(CONFIG_ARCH_BCM)		+= bcm

# SPDX-License-Identifier: GPL-2.0-or-later

# Copyright (C) ASPEED Technology Inc.

# Copyright IBM Corp.

obj-$(CONFIG_SMP) += platsmp.o

// SPDX-License-Identifier: GPL-2.0-or-later

// Copyright (C) ASPEED Technology Inc.

// Copyright IBM Corp.

#include <linux/of_address.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/smp.h>

#define BOOT_ADDR	0x00

#define BOOT_SIG	0x04

static struct device_node *secboot_node;

static int aspeed_g6_boot_secondary(unsigned int cpu, struct task_struct *idle)

{

	void __iomem *base;

	base = of_iomap(secboot_node, 0);

	if (!base) {

		pr_err("could not map the secondary boot base!");

		return -ENODEV;

	}

	writel_relaxed(0, base + BOOT_ADDR);

	writel_relaxed(__pa_symbol(secondary_startup_arm), base + BOOT_ADDR);

	writel_relaxed((0xABBAAB00 | (cpu & 0xff)), base + BOOT_SIG);

	dsb_sev();

	iounmap(base);

	return 0;

}

static void __init aspeed_g6_smp_prepare_cpus(unsigned int max_cpus)

{

	void __iomem *base;

	secboot_node = of_find_compatible_node(NULL, NULL, "aspeed,ast2600-smpmem");

	if (!secboot_node) {

		pr_err("secboot device node found!!\n");

		return;

	}

	base = of_iomap(secboot_node, 0);

	if (!base) {

		pr_err("could not map the secondary boot base!");

		return;

	}

	__raw_writel(0xBADABABA, base + BOOT_SIG);

	iounmap(base);

}

static const struct smp_operations aspeed_smp_ops __initconst = {

	.smp_prepare_cpus	= aspeed_g6_smp_prepare_cpus,

	.smp_boot_secondary	= aspeed_g6_boot_secondary,

};

CPU_METHOD_OF_DECLARE(aspeed_smp, "aspeed,ast2600-smp", &aspeed_smp_ops);