1 /* 2 * (C) Copyright 2002 3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 4 * Marius Groeger <mgroeger@sysgo.de> 5 * 6 * (C) Copyright 2002 7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8 * Alex Zuepke <azu@sysgo.de> 9 * 10 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 /* 30 * CPU specific code 31 */ 32 33 #include <common.h> 34 #include <command.h> 35 #include <clps7111.h> 36 #include <asm/hardware.h> 37 #include <asm/system.h> 38 39 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) 40 static void cache_flush(void); 41 #endif 42 43 int cleanup_before_linux (void) 44 { 45 /* 46 * this function is called just before we call linux 47 * it prepares the processor for linux 48 * 49 * we turn off caches etc ... 50 * and we set the CPU-speed to 73 MHz - see start.S for details 51 */ 52 53 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) 54 disable_interrupts (); 55 56 /* turn off I-cache */ 57 icache_disable(); 58 dcache_disable(); 59 60 /* flush I-cache */ 61 cache_flush(); 62 #ifdef CONFIG_ARM7_REVD 63 /* go to high speed */ 64 IO_SYSCON3 = (IO_SYSCON3 & ~CLKCTL) | CLKCTL_73; 65 #endif 66 #elif defined(CONFIG_NETARM) || defined(CONFIG_S3C4510B) || defined(CONFIG_LPC2292) 67 disable_interrupts (); 68 /* Nothing more needed */ 69 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR) 70 /* No cleanup before linux for IntegratorAP/CM720T as yet */ 71 #else 72 #error No cleanup_before_linux() defined for this CPU type 73 #endif 74 return 0; 75 } 76 77 #if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) 78 /* flush I/D-cache */ 79 static void cache_flush (void) 80 { 81 unsigned long i = 0; 82 83 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 84 } 85 #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR) 86 /* No specific cache setup for IntegratorAP/CM720T as yet */ 87 void icache_enable (void) 88 { 89 } 90 #endif 91