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_select(int flags) 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 if (flags & CBL_DISABLE_CACHES) { 40 /* 41 * turn off D-cache 42 * dcache_disable() in turn flushes the d-cache and disables MMU 43 */ 44 dcache_disable(); 45 v7_outer_cache_disable(); 46 47 /* 48 * After D-cache is flushed and before it is disabled there may 49 * be some new valid entries brought into the cache. We are 50 * sure that these lines are not dirty and will not affect our 51 * execution. (because unwinding the call-stack and setting a 52 * bit in CP15 SCTRL is all we did during this. We have not 53 * pushed anything on to the stack. Neither have we affected 54 * any static data) So just invalidate the entire d-cache again 55 * to avoid coherency problems for kernel 56 */ 57 invalidate_dcache_all(); 58 59 icache_disable(); 60 invalidate_icache_all(); 61 } else { 62 /* 63 * Turn off I-cache and invalidate it 64 */ 65 icache_disable(); 66 invalidate_icache_all(); 67 68 flush_dcache_all(); 69 invalidate_icache_all(); 70 icache_enable(); 71 } 72 73 /* 74 * Some CPU need more cache attention before starting the kernel. 75 */ 76 cpu_cache_initialization(); 77 78 return 0; 79 } 80 81 int cleanup_before_linux(void) 82 { 83 return cleanup_before_linux_select(CBL_ALL); 84 } 85