arch/arm/cpu/armv7/cpu.c

/*
 * (C) Copyright 2008 Texas Insturments
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * CPU specific code
 */

#include <common.h>
#include <command.h>
#include <fthread.h>
#include <asm/system.h>
#include <asm/cache.h>
#include <asm/armv7.h>
#include <linux/compiler.h>

void __weak cpu_cache_initialization(void){}
void __weak arch_cleanup_before_linux(void){}

int cleanup_before_linux_select(int flags)
{
#ifdef CONFIG_FTHREAD
	fthread_shutdown();
#endif
#ifdef CONFIG_BOOTSTAGE_FDT
	if (flag == BOOTM_STATE_OS_FAKE_GO)
		bootstage_fdt_add_report();
#endif
#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_BOOTSTAGE_REPORT)
	if (flags & CBL_SHOW_BOOTSTAGE_REPORT)
		bootstage_report();
#endif
#ifdef CONFIG_CONSOLE_RECORDING
	{
		int rv;

		rv = boot_fdt_add_console_buffer();
		if (rv)
			printf("%s: Console recording failed (%d)\n",
			       __func__, rv);
	}
#endif
#ifdef CONFIG_BOOTSTAGE_STASH
	bootstage_stash((void *)CONFIG_BOOTSTAGE_STASH,
			CONFIG_BOOTSTAGE_STASH_SIZE);
#endif
	/*
	 * this function is called just before we call linux
	 * it prepares the processor for linux
	 *
	 * we turn off caches etc ...
	 */
#ifndef CONFIG_SPL_BUILD
	disable_interrupts();
#endif
	/*
	 * Cleanup any of those architecture related settings done for u-boot,
	 * if they can cause problem during kernel boot.
	 */
	arch_cleanup_before_linux();

	/*
	 * Turn off I-cache and invalidate it
	 */
	icache_disable();
	invalidate_icache_all();

	if (flags & CBL_DISABLE_CACHES) {
		/*
		* turn off D-cache
		* dcache_disable() in turn flushes the d-cache and disables MMU
		*/
		dcache_disable();
		v7_outer_cache_disable();

		/*
		* After D-cache is flushed and before it is disabled there may
		* be some new valid entries brought into the cache. We are
		* sure that these lines are not dirty and will not affect our
		* execution. (because unwinding the call-stack and setting a
		* bit in CP15 SCTRL is all we did during this. We have not
		* pushed anything on to the stack. Neither have we affected
		* any static data) So just invalidate the entire d-cache again
		* to avoid coherency problems for kernel
		*/
		invalidate_dcache_all();
	} else {
		flush_dcache_all();
		invalidate_icache_all();
		icache_enable();
	}

	/*
	 * Some CPU need more cache attention before starting the kernel.
	 */
	cpu_cache_initialization();

	return 0;
}

int cleanup_before_linux(void)
{
	return cleanup_before_linux_select(CBL_ALL);
}