LXR linux/arch/arm/plat-samsung/cpu.c

   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
   4//              http://www.samsung.com
   5//
   6// Samsung CPU Support
   7
   8#include <linux/module.h>
   9#include <linux/kernel.h>
  10#include <linux/init.h>
  11#include <linux/io.h>
  12
  13#include <plat/map-base.h>
  14#include <plat/cpu.h>
  15
  16unsigned long samsung_cpu_id;
  17static unsigned int samsung_cpu_rev;
  18
  19unsigned int samsung_rev(void)
  20{
  21        return samsung_cpu_rev;
  22}
  23EXPORT_SYMBOL(samsung_rev);
  24
  25void __init s3c64xx_init_cpu(void)
  26{
  27        samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
  28        if (!samsung_cpu_id) {
  29                /*
  30                 * S3C6400 has the ID register in a different place,
  31                 * and needs a write before it can be read.
  32                 */
  33                writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
  34                samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
  35        }
  36
  37        samsung_cpu_rev = 0;
  38
  39        pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
  40}
  41
  42void __init s5p_init_cpu(const void __iomem *cpuid_addr)
  43{
  44        samsung_cpu_id = readl_relaxed(cpuid_addr);
  45        samsung_cpu_rev = samsung_cpu_id & 0xFF;
  46
  47        pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
  48}
  49