arch/arm/cpu/arm920t/cpu.c

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