arm/mach-s3c/cpu.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
0004 //      http://www.samsung.com
0005 //
0006 // Samsung CPU Support
0007
0008 #include <linux/module.h>
0009 #include <linux/kernel.h>
0010 #include <linux/init.h>
0011 #include <linux/io.h>
0012
0013 #include "map-base.h"
0014 #include "cpu.h"
0015
0016 unsigned long samsung_cpu_id;
0017
0018 void __init s3c64xx_init_cpu(void)
0019 {
0020     samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
0021     if (!samsung_cpu_id) {
0022         /*
0023          * S3C6400 has the ID register in a different place,
0024          * and needs a write before it can be read.
0025          */
0026         writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
0027         samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
0028     }
0029
0030     pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
0031     pr_err("The platform is deprecated and scheduled for removal. Please reach to the maintainers of the platform and linux-samsung-soc@vger.kernel.org if you still use it.  Without such feedback, the platform will be removed after 2022.\n");
0032 }