arch/arm/cpu/arm946es/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         /* ARM926E-S needs the protection unit enabled for the icache to have
  34          * been enabled  - left for possible later use
  35          * should turn off the protection unit as well....
  36          */
  37         /* turn off I/D-cache */
  38         icache_disable();
  39         dcache_disable();
  40         /* flush I/D-cache */
  41         cache_flush();
  42
  43         return 0;
  44 }
  45
  46 /* flush I/D-cache */
  47 static void cache_flush (void)
  48 {
  49         unsigned long i = 0;
  50
  51         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
  52         asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i));
  53 }