root/arch/arm/plat-samsung/cpu.c

DEFINITIONS

1. samsung_rev
2. s3c64xx_init_cpu
3. s5p_init_cpu

   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 
  16 unsigned long samsung_cpu_id;
  17 static unsigned int samsung_cpu_rev;
  18 
  19 unsigned int samsung_rev(void)
  20 {
  21         return samsung_cpu_rev;
  22 }
  23 EXPORT_SYMBOL(samsung_rev);
  24 
  25 void __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 
  42 void __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 }