freebsd-dev/sys/powerpc/mpc85xx/mpc85xx.c

/*-
 * Copyright (C) 2008 Semihalf, Rafal Jaworowski
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>

#include <vm/vm.h>
#include <vm/vm_param.h>

#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/spr.h>

#include <powerpc/mpc85xx/ocpbus.h>
#include <powerpc/mpc85xx/mpc85xx.h>

/*
 * MPC85xx system specific routines
 */

uint32_t
ccsr_read4(uintptr_t addr)
{
	volatile uint32_t *ptr = (void *)addr;

	return (*ptr);
}

void
ccsr_write4(uintptr_t addr, uint32_t val)
{
	volatile uint32_t *ptr = (void *)addr;

	*ptr = val;
	__asm __volatile("eieio; sync");
}

void
cpu_reset(void)
{
	uint32_t ver = SVR_VER(mfspr(SPR_SVR));

	if (ver == SVR_MPC8572E || ver == SVR_MPC8572)
		/* Systems with dedicated reset register */
		ccsr_write4(OCP85XX_RSTCR, 2);
	else {
		/* Clear DBCR0, disables debug interrupts and events. */
		mtspr(SPR_DBCR0, 0);
		__asm __volatile("isync");

		/* Enable Debug Interrupts in MSR. */
		mtmsr(mfmsr() | PSL_DE);

		/* Enable debug interrupts and issue reset. */
		mtspr(SPR_DBCR0, mfspr(SPR_DBCR0) | DBCR0_IDM |
		    DBCR0_RST_SYSTEM);
	}

	printf("Reset failed...\n");
	while (1);
}