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

   1/*
   2 * (C) Copyright 2008 Texas Insturments
   3 *
   4 * (C) Copyright 2002
   5 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6 * Marius Groeger <mgroeger@sysgo.de>
   7 *
   8 * (C) Copyright 2002
   9 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
  10 *
  11 * SPDX-License-Identifier:     GPL-2.0+
  12 */
  13
  14#include <common.h>
  15#include <command.h>
  16#include <asm/system.h>
  17#include <asm/secure.h>
  18#include <linux/compiler.h>
  19
  20/*
  21 * sdelay() - simple spin loop.
  22 *
  23 * Will delay execution by roughly (@loops * 2) cycles.
  24 * This is necessary to be used before timers are accessible.
  25 *
  26 * A value of "0" will results in 2^64 loops.
  27 */
  28void sdelay(unsigned long loops)
  29{
  30        __asm__ volatile ("1:\n" "subs %0, %0, #1\n"
  31                          "b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
  32}
  33
  34int cleanup_before_linux(void)
  35{
  36        /*
  37         * this function is called just before we call linux
  38         * it prepares the processor for linux
  39         *
  40         * disable interrupt and turn off caches etc ...
  41         */
  42        disable_interrupts();
  43
  44        /*
  45         * Turn off I-cache and invalidate it
  46         */
  47        icache_disable();
  48        invalidate_icache_all();
  49
  50        /*
  51         * turn off D-cache
  52         * dcache_disable() in turn flushes the d-cache and disables MMU
  53         */
  54        dcache_disable();
  55        invalidate_dcache_all();
  56
  57        return 0;
  58}
  59
  60#ifdef CONFIG_ARMV8_PSCI
  61static void relocate_secure_section(void)
  62{
  63#ifdef CONFIG_ARMV8_SECURE_BASE
  64        size_t sz = __secure_end - __secure_start;
  65
  66        memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
  67        flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
  68                           CONFIG_ARMV8_SECURE_BASE + sz + 1);
  69        invalidate_icache_all();
  70#endif
  71}
  72
  73void armv8_setup_psci(void)
  74{
  75        relocate_secure_section();
  76        secure_ram_addr(psci_setup_vectors)();
  77        secure_ram_addr(psci_arch_init)();
  78}
  79#endif
  80