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Commit 87dfe496 authored by Joel Stanley's avatar Joel Stanley
Browse files

ARM: aspeed: Enable SMP boot 



This brings the secondary CPU into Linux. It depends on the setup
performed by ASPEED's u-boot.

Signed-off-by: default avatarJoel Stanley <joel@jms.id.au>
parent 9afe2c0a

arch/arm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -155,6 +155,7 @@ textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000 
machine-$(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

arch/arm/mach-aspeed/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-or-later

# Copyright (C) ASPEED Technology Inc.

# Copyright IBM Corp.



obj-$(CONFIG_SMP) += platsmp.o

arch/arm/mach-aspeed/platsmp.c

0 → 100644
+61 −0
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// 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);