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 * SPDX-License-Identifier: GPL-2.0+ 11 */ 12 13 /* 14 * CPU specific code 15 */ 16 17 #include <common.h> 18 #include <command.h> 19 #include <asm/system.h> 20 #include <asm/io.h> 21 22 static void cache_flush(void); 23 24 int cleanup_before_linux (void) 25 { 26 /* 27 * this function is called just before we call linux 28 * it prepares the processor for linux 29 * 30 * just disable everything that can disturb booting linux 31 */ 32 33 disable_interrupts (); 34 35 /* turn off I-cache */ 36 icache_disable(); 37 dcache_disable(); 38 39 /* flush I-cache */ 40 cache_flush(); 41 42 return (0); 43 } 44 45 /* flush I/D-cache */ 46 static void cache_flush (void) 47 { 48 unsigned long i = 0; 49 50 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 51 } 52 53 #define RST_BASE 0x90030000 54 #define RSRR 0x00 55 #define RCSR 0x04 56 57 __attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused))) 58 { 59 /* repeat endlessly */ 60 while (1) { 61 writel(0, RST_BASE + RCSR); 62 writel(1, RST_BASE + RSRR); 63 } 64 } 65