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 /* 15 * CPU specific code 16 */ 17 18 #include <common.h> 19 #include <command.h> 20 #include <asm/system.h> 21 #include <asm/cache.h> 22 #include <asm/armv7.h> 23 #include <linux/compiler.h> 24 25 void __weak cpu_cache_initialization(void){} 26 27 int cleanup_before_linux(void) 28 { 29 /* 30 * this function is called just before we call linux 31 * it prepares the processor for linux 32 * 33 * we turn off caches etc ... 34 */ 35 #ifndef CONFIG_SPL_BUILD 36 disable_interrupts(); 37 #endif 38 39 /* 40 * Turn off I-cache and invalidate it 41 */ 42 icache_disable(); 43 invalidate_icache_all(); 44 45 /* 46 * turn off D-cache 47 * dcache_disable() in turn flushes the d-cache and disables MMU 48 */ 49 dcache_disable(); 50 v7_outer_cache_disable(); 51 52 /* 53 * After D-cache is flushed and before it is disabled there may 54 * be some new valid entries brought into the cache. We are sure 55 * that these lines are not dirty and will not affect our execution. 56 * (because unwinding the call-stack and setting a bit in CP15 SCTLR 57 * is all we did during this. We have not pushed anything on to the 58 * stack. Neither have we affected any static data) 59 * So just invalidate the entire d-cache again to avoid coherency 60 * problems for kernel 61 */ 62 invalidate_dcache_all(); 63 64 /* 65 * Some CPU need more cache attention before starting the kernel. 66 */ 67 cpu_cache_initialization(); 68 69 return 0; 70 } 71