arch/arm/cpu/arm926ejs/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 <asm/system.h>
  19
  20 static void cache_flush(void);
  21
  22 int cleanup_before_linux (void)
  23 {
  24         /*
  25          * this function is called just before we call linux
  26          * it prepares the processor for linux
  27          *
  28          * we turn off caches etc ...
  29          */
  30
  31         disable_interrupts ();
  32
  33
  34         /* turn off I/D-cache */
  35         icache_disable();
  36         dcache_disable();
  37         l2_cache_disable();
  38
  39         /* flush I/D-cache */
  40         cache_flush();
  41
  42         return 0;
  43 }
  44
  45 /* flush I/D-cache */
  46 static void cache_flush (void)
  47 {
  48         unsigned long i = 0;
  49
  50         asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
  51 }