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 * See file CREDITS for list of people who contributed to this 12 * project. 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License as 16 * published by the Free Software Foundation; either version 2 of 17 * the License, or (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 27 * MA 02111-1307 USA 28 */ 29 30 /* 31 * CPU specific code 32 */ 33 34 #include <common.h> 35 #include <command.h> 36 #include <asm/system.h> 37 #include <asm/cache.h> 38 #include <asm/armv7.h> 39 #include <linux/compiler.h> 40 41 void __naked save_boot_params_default(u32 r0, u32 r1, u32 r2, u32 r3) 42 { 43 /* 44 * Stack pointer is not yet initialized 45 * Don't save anything to stack even if compiled with -O0 46 */ 47 asm("bx lr"); 48 } 49 50 void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) 51 __attribute__((weak, alias("save_boot_params_default"))); 52 53 int cleanup_before_linux(void) 54 { 55 /* 56 * this function is called just before we call linux 57 * it prepares the processor for linux 58 * 59 * we turn off caches etc ... 60 */ 61 #ifndef CONFIG_SPL_BUILD 62 disable_interrupts(); 63 #endif 64 65 /* 66 * Turn off I-cache and invalidate it 67 */ 68 icache_disable(); 69 invalidate_icache_all(); 70 71 /* 72 * turn off D-cache 73 * dcache_disable() in turn flushes the d-cache and disables MMU 74 */ 75 dcache_disable(); 76 v7_outer_cache_disable(); 77 78 /* 79 * After D-cache is flushed and before it is disabled there may 80 * be some new valid entries brought into the cache. We are sure 81 * that these lines are not dirty and will not affect our execution. 82 * (because unwinding the call-stack and setting a bit in CP15 SCTRL 83 * is all we did during this. We have not pushed anything on to the 84 * stack. Neither have we affected any static data) 85 * So just invalidate the entire d-cache again to avoid coherency 86 * problems for kernel 87 */ 88 invalidate_dcache_all(); 89 90 return 0; 91 } 92