u-boot/arch/arm/cpu/armv8/cpu.c
Andre Przywara 8ed02bc2d9 armv8: add simple sdelay implementation
The sunxi DRAM setup code needs an sdelay() implementation, which
wasn't defined for armv8 so far.
Shamelessly copy the armv7 version and adjust it to work in AArch64.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
2017-01-04 16:37:41 +01:00

79 lines
1.7 KiB
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>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <asm/system.h>
#include <asm/secure.h>
#include <linux/compiler.h>
/*
* sdelay() - simple spin loop.
*
* Will delay execution by roughly (@loops * 2) cycles.
* This is necessary to be used before timers are accessible.
*
* A value of "0" will results in 2^64 loops.
*/
void sdelay(unsigned long loops)
{
__asm__ volatile ("1:\n" "subs %0, %0, #1\n"
"b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
}
int cleanup_before_linux(void)
{
/*
* this function is called just before we call linux
* it prepares the processor for linux
*
* disable interrupt and turn off caches etc ...
*/
disable_interrupts();
/*
* Turn off I-cache and invalidate it
*/
icache_disable();
invalidate_icache_all();
/*
* turn off D-cache
* dcache_disable() in turn flushes the d-cache and disables MMU
*/
dcache_disable();
invalidate_dcache_all();
return 0;
}
#ifdef CONFIG_ARMV8_PSCI
static void relocate_secure_section(void)
{
#ifdef CONFIG_ARMV8_SECURE_BASE
size_t sz = __secure_end - __secure_start;
memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
CONFIG_ARMV8_SECURE_BASE + sz + 1);
invalidate_icache_all();
#endif
}
void armv8_setup_psci(void)
{
relocate_secure_section();
secure_ram_addr(psci_setup_vectors)();
secure_ram_addr(psci_arch_init)();
}
#endif