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 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 9 * Alex Zuepke <azu (at) sysgo.de> 10 */ 11 12 /* 13 * CPU specific code 14 */ 15 16 #include <common.h> 17 #include <command.h> 18 #include <asm/system.h> 19 #include <asm/io.h> 20 21 static void cache_flush(void); 22 23 int cleanup_before_linux (void) 24 { 25 /* 26 * this function is called just before we call linux 27 * it prepares the processor for linux 28 * 29 * just disable everything that can disturb booting linux 30 */ 31 32 disable_interrupts (); 33 34 /* turn off I-cache */ 35 icache_disable(); 36 dcache_disable(); 37 38 /* flush I-cache */ 39 cache_flush(); 40 41 return (0); 42 } 43 44 /* flush I/D-cache */ 45 static void cache_flush (void) 46 { 47 unsigned long i = 0; 48 49 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 50 } 51 52 #define RST_BASE 0x90030000 53 #define RSRR 0x00 54 #define RCSR 0x04 55 56 __attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused))) 57 { 58 /* repeat endlessly */ 59 while (1) { 60 writel(0, RST_BASE + RCSR); 61 writel(1, RST_BASE + RSRR); 62 } 63 } 64
