1 /* 2 * reset.c -- common ColdFire SoC reset support 3 * 4 * (C) Copyright 2012, Greg Ungerer <gerg@uclinux.org> 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/io.h> 14 #include <asm/machdep.h> 15 #include <asm/coldfire.h> 16 #include <asm/mcfsim.h> 17 18 /* 19 * There are 2 common methods amongst the ColdFure parts for reseting 20 * the CPU. But there are couple of exceptions, the 5272 and the 547x 21 * have something completely special to them, and we let their specific 22 * subarch code handle them. 23 */ 24 25 #ifdef MCFSIM_SYPCR mcf_cpu_reset(void)26static void mcf_cpu_reset(void) 27 { 28 local_irq_disable(); 29 /* Set watchdog to soft reset, and enabled */ 30 __raw_writeb(0xc0, MCFSIM_SYPCR); 31 for (;;) 32 /* wait for watchdog to timeout */; 33 } 34 #endif 35 36 #ifdef MCF_RCR mcf_cpu_reset(void)37static void mcf_cpu_reset(void) 38 { 39 local_irq_disable(); 40 __raw_writeb(MCF_RCR_SWRESET, MCF_RCR); 41 } 42 #endif 43 mcf_setup_reset(void)44static int __init mcf_setup_reset(void) 45 { 46 mach_reset = mcf_cpu_reset; 47 return 0; 48 } 49 50 arch_initcall(mcf_setup_reset); 51