arch/arm/cpu/arm1176/cpu.c

   1 /*
   2  * (C) Copyright 2004 Texas Insturments
   3  *
   4  * (C) Copyright 2002
   5  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Marius Groeger <mgroeger@sysgo.de>
   7  *
   8  * (C) Copyright 2002
   9  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 /*
  15  * CPU specific code
  16  */
  17
  18 #include <common.h>
  19 #include <command.h>
  20 #include <asm/system.h>
  21
  22 static void cache_flush (void);
  23
  24 int cleanup_before_linux (void)
  25 {
  26         /*
  27          * this function is called just before we call linux
  28          * it prepares the processor for linux
  29          *
  30          * we turn off caches etc ...
  31          */
  32
  33         disable_interrupts ();
  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         /* invalidate both caches and flush btb */
  48         asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (0));
  49         /* mem barrier to sync things */
  50         asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (0));
  51 }