LXR uboot/arch/arm/cpu/arm926ejs/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 <cpu_func.h>
  18#include <irq_func.h>
  19#include <asm/cache.h>
  20#include <asm/system.h>
  21
  22static void cache_flush(void);
  23
  24int 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
  36        /* turn off I/D-cache */
  37        icache_disable();
  38        dcache_disable();
  39        l2_cache_disable();
  40
  41        /* flush I/D-cache */
  42        cache_flush();
  43
  44        return 0;
  45}
  46
  47/* flush I/D-cache */
  48static void cache_flush (void)
  49{
  50#if !(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
  51        unsigned long i = 0;
  52
  53        asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
  54#endif
  55}
  56