1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2002 4 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 5 * Marius Groeger <mgroeger (at) sysgo.de> 6 * 7 * (C) Copyright 2002 8 * Gary Jennejohn, DENX Software Engineering, <garyj (at) denx.de> 9 */ 10 11 /* 12 * CPU specific code 13 */ 14 15 #include <common.h> 16 #include <command.h> 17 #include <asm/system.h> 18 #include <asm/io.h> 19 20 static void cache_flush(void); 21 22 int cleanup_before_linux (void) 23 { 24 /* 25 * this function is called just before we call linux 26 * it prepares the processor for linux 27 * 28 * we turn off caches etc ... 29 */ 30 31 disable_interrupts (); 32 33 /* ARM926E-S needs the protection unit enabled for the icache to have 34 * been enabled - left for possible later use 35 * should turn off the protection unit as well.... 36 */ 37 /* turn off I/D-cache */ 38 icache_disable(); 39 dcache_disable(); 40 /* flush I/D-cache */ 41 cache_flush(); 42 43 return 0; 44 } 45 46 /* flush I/D-cache */ 47 static void cache_flush (void) 48 { 49 unsigned long i = 0; 50 51 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 52 asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i)); 53 } 54 55 #ifndef CONFIG_ARCH_INTEGRATOR 56 57 __attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused))) 58 { 59 writew(0x0, 0xfffece10); 60 writew(0x8, 0xfffece10); 61 for (;;) 62 ; 63 } 64 65 #endif /* #ifdef CONFIG_ARCH_INTEGRATOR */ 66
