1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * (C) Copyright 2002 3*4882a593Smuzhiyun * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 4*4882a593Smuzhiyun * Marius Groeger <mgroeger@sysgo.de> 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * (C) Copyright 2002 7*4882a593Smuzhiyun * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8*4882a593Smuzhiyun * Alex Zuepke <azu@sysgo.de> 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 11*4882a593Smuzhiyun */ 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /* 14*4882a593Smuzhiyun * CPU specific code 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #include <common.h> 18*4882a593Smuzhiyun #include <command.h> 19*4882a593Smuzhiyun #include <asm/system.h> 20*4882a593Smuzhiyun #include <asm/io.h> 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun static void cache_flush(void); 23*4882a593Smuzhiyun cleanup_before_linux(void)24*4882a593Smuzhiyunint cleanup_before_linux (void) 25*4882a593Smuzhiyun { 26*4882a593Smuzhiyun /* 27*4882a593Smuzhiyun * this function is called just before we call linux 28*4882a593Smuzhiyun * it prepares the processor for linux 29*4882a593Smuzhiyun * 30*4882a593Smuzhiyun * just disable everything that can disturb booting linux 31*4882a593Smuzhiyun */ 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun disable_interrupts (); 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun /* turn off I-cache */ 36*4882a593Smuzhiyun icache_disable(); 37*4882a593Smuzhiyun dcache_disable(); 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun /* flush I-cache */ 40*4882a593Smuzhiyun cache_flush(); 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun return (0); 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /* flush I/D-cache */ cache_flush(void)46*4882a593Smuzhiyunstatic void cache_flush (void) 47*4882a593Smuzhiyun { 48*4882a593Smuzhiyun unsigned long i = 0; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); 51*4882a593Smuzhiyun } 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun #define RST_BASE 0x90030000 54*4882a593Smuzhiyun #define RSRR 0x00 55*4882a593Smuzhiyun #define RCSR 0x04 56*4882a593Smuzhiyun reset_cpu(ulong addr)57*4882a593Smuzhiyun__attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused))) 58*4882a593Smuzhiyun { 59*4882a593Smuzhiyun /* repeat endlessly */ 60*4882a593Smuzhiyun while (1) { 61*4882a593Smuzhiyun writel(0, RST_BASE + RCSR); 62*4882a593Smuzhiyun writel(1, RST_BASE + RSRR); 63*4882a593Smuzhiyun } 64*4882a593Smuzhiyun } 65