Release 4.17 arch/arm/plat-samsung/cpu.c

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
//              http://www.samsung.com
//
// Samsung CPU Support

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <plat/map-base.h>
#include <plat/cpu.h>


unsigned long samsung_cpu_id;

static unsigned int samsung_cpu_rev;



unsigned int samsung_rev(void)
{
	return samsung_cpu_rev;
}
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EXPORT_SYMBOL(samsung_rev);



void __init s3c64xx_init_cpu(void)
{
	samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
	if (!samsung_cpu_id) {
		/*
                 * S3C6400 has the ID register in a different place,
                 * and needs a write before it can be read.
                 */
		writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
		samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
	}

	samsung_cpu_rev = 0;

	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
}

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void __init s5p_init_cpu(const void __iomem *cpuid_addr)
{
	samsung_cpu_id = readl_relaxed(cpuid_addr);
	samsung_cpu_rev = samsung_cpu_id & 0xFF;

	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
}
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Directory: arch/arm/plat-samsung

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