// SPDX-License-Identifier: GPL-2.0+ /* * (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> */ /* * CPU specific code */ #include <common.h> #include <command.h> #include <cpu_func.h> #include <irq_func.h> #include <asm/cache.h> #include <asm/system.h> static void cache_flush(void); /************************************************************ * sdelay() - simple spin loop. Will be constant time as * its generally used in bypass conditions only. This * is necessary until timers are accessible. * * not inline to increase chances its in cache when called *************************************************************/ void sdelay(unsigned long loops) { __asm__ volatile ("1:\n" "subs %0, %1, #1\n" "bne 1b":"=r" (loops):"0"(loops)); } int cleanup_before_linux (void) { /* * this function is called just before we call linux * it prepares the processor for linux * * we turn off caches etc ... */ disable_interrupts(); /* turn off I/D-cache */ icache_disable(); dcache_disable(); l2_cache_disable(); /* flush I/D-cache */ cache_flush(); return 0; } /* flush I/D-cache */ static void cache_flush (void) { #if !(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF)) unsigned long i = 0; asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); #endif }