LXR linux/arch/m68k/coldfire/reset.c

   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
  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
  37static void mcf_cpu_reset(void)
  38{
  39        local_irq_disable();
  40        __raw_writeb(MCF_RCR_SWRESET, MCF_RCR);
  41}
  42#endif
  43
  44static int __init mcf_setup_reset(void)
  45{
  46        mach_reset = mcf_cpu_reset;
  47        return 0;
  48}
  49
  50arch_initcall(mcf_setup_reset);
  51