arch/arm/cpu/sa1100/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  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Alex Zuepke <azu@sysgo.de>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 /*
  14  * CPU specific code
  15  */
  16
  17 #include <common.h>
  18 #include <command.h>
  19 #include <asm/system.h>
  20
  21 #ifdef CONFIG_USE_IRQ
  22 DECLARE_GLOBAL_DATA_PTR;
  23 #endif
  24
  25 static void cache_flush(void);
  26
  27 int cleanup_before_linux (void)
  28 {
  29         /*
  30          * this function is called just before we call linux
  31          * it prepares the processor for linux
  32          *
  33          * just disable everything that can disturb booting linux
  34          */
  35
  36         disable_interrupts ();
  37
  38         /* turn off I-cache */
  39         icache_disable();
  40         dcache_disable();
  41
  42         /* flush I-cache */
  43         cache_flush();
  44
  45         return (0);
  46 }
  47
  48 /* flush I/D-cache */
  49 static void cache_flush (void)
  50 {
  51         unsigned long i = 0;
  52
  53         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
  54 }