LXR uboot/arch/arm/cpu/armv8/cpu.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2008 Texas Insturments
   4 *
   5 * (C) Copyright 2002
   6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7 * Marius Groeger <mgroeger@sysgo.de>
   8 *
   9 * (C) Copyright 2002
  10 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
  11 */
  12
  13#include <common.h>
  14#include <command.h>
  15#include <asm/system.h>
  16#include <asm/secure.h>
  17#include <linux/compiler.h>
  18
  19/*
  20 * sdelay() - simple spin loop.
  21 *
  22 * Will delay execution by roughly (@loops * 2) cycles.
  23 * This is necessary to be used before timers are accessible.
  24 *
  25 * A value of "0" will results in 2^64 loops.
  26 */
  27void sdelay(unsigned long loops)
  28{
  29        __asm__ volatile ("1:\n" "subs %0, %0, #1\n"
  30                          "b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
  31}
  32
  33int cleanup_before_linux(void)
  34{
  35        /*
  36         * this function is called just before we call linux
  37         * it prepares the processor for linux
  38         *
  39         * disable interrupt and turn off caches etc ...
  40         */
  41        disable_interrupts();
  42
  43        /*
  44         * Turn off I-cache and invalidate it
  45         */
  46        icache_disable();
  47        invalidate_icache_all();
  48
  49        /*
  50         * turn off D-cache
  51         * dcache_disable() in turn flushes the d-cache and disables MMU
  52         */
  53        dcache_disable();
  54        invalidate_dcache_all();
  55
  56        return 0;
  57}
  58
  59#ifdef CONFIG_ARMV8_PSCI
  60static void relocate_secure_section(void)
  61{
  62#ifdef CONFIG_ARMV8_SECURE_BASE
  63        size_t sz = __secure_end - __secure_start;
  64
  65        memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
  66        flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
  67                           CONFIG_ARMV8_SECURE_BASE + sz + 1);
  68        invalidate_icache_all();
  69#endif
  70}
  71
  72void armv8_setup_psci(void)
  73{
  74        relocate_secure_section();
  75        secure_ram_addr(psci_setup_vectors)();
  76        secure_ram_addr(psci_arch_init)();
  77}
  78#endif
  79