arch/arm/cpu/arm925t/cpu.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * (C) Copyright 2002
   7  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 /*
  13  * CPU specific code
  14  */
  15
  16 #include <common.h>
  17 #include <command.h>
  18 #include <arm925t.h>
  19 #include <asm/system.h>
  20
  21 static void cache_flush(void);
  22
  23 int cleanup_before_linux (void)
  24 {
  25         /*
  26          * this function is called just before we call linux
  27          * it prepares the processor for linux
  28          *
  29          * we turn off caches etc ...
  30          */
  31
  32         disable_interrupts ();
  33
  34
  35         /* turn off I/D-cache */
  36         icache_disable();
  37         dcache_disable();
  38         /* flush I/D-cache */
  39         cache_flush();
  40
  41         return 0;
  42 }
  43
  44 /* flush I/D-cache */
  45 static void cache_flush (void)
  46 {
  47         unsigned long i = 0;
  48
  49         asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
  50 }