/* * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, wd@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 */ #include <common.h> #include <asm/system.h> #if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE)) static void cp_delay (void) { volatile int i; /* copro seems to need some delay between reading and writing */ for (i = 0; i < 100; i++) nop(); } /* cache_bit must be either CR_I or CR_C */ static void cache_enable(uint32_t cache_bit) { uint32_t reg; reg = get_cr(); /* get control reg. */ cp_delay(); set_cr(reg | cache_bit); } /* cache_bit must be either CR_I or CR_C */ static void cache_disable(uint32_t cache_bit) { uint32_t reg; reg = get_cr(); cp_delay(); set_cr(reg & ~cache_bit); } #endif #ifdef CONFIG_SYS_NO_ICACHE void icache_enable (void) { return; } void icache_disable (void) { return; } int icache_status (void) { return 0; /* always off */ } #else void icache_enable(void) { cache_enable(CR_I); } void icache_disable(void) { cache_disable(CR_I); } int icache_status(void) { return (get_cr() & CR_I) != 0; } #endif #ifdef CONFIG_SYS_NO_DCACHE void dcache_enable (void) { return; } void dcache_disable (void) { return; } int dcache_status (void) { return 0; /* always off */ } #else void dcache_enable(void) { cache_enable(CR_C); } void dcache_disable(void) { cache_disable(CR_C); } int dcache_status(void) { return (get_cr() & CR_C) != 0; } #endif