xref: /freebsd-11.0-release/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.
 *
 * 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: head/sys/powerpc/mpc85xx/mpc85xx.c 189757 2009-03-13 06:28:20Z raj $");

#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");
}

int
law_getmax(void)
{
	uint32_t ver;

	ver = SVR_VER(mfspr(SPR_SVR));
	if (ver == SVR_MPC8572E || ver == SVR_MPC8572)
		return (12);
	else if (ver == SVR_MPC8548E || ver == SVR_MPC8548)
		return (10);
	else
		return (8);
}

#define	_LAW_SR(trgt,size)	(0x80000000 | (trgt << 20) | (ffsl(size) - 2))
#define	_LAW_BAR(addr)		(addr >> 12)

int
law_enable(int trgt, u_long addr, u_long size)
{
	uint32_t bar, sr;
	int i, law_max;

	law_max = law_getmax();
	bar = _LAW_BAR(addr);
	sr = _LAW_SR(trgt, size);

	/* Bail if already programmed. */
	for (i = 0; i < law_max; i++)
		if (sr == ccsr_read4(OCP85XX_LAWSR(i)) &&
		    bar == ccsr_read4(OCP85XX_LAWBAR(i)))
			return (0);

	/* Find an unused access window. */
	for (i = 0; i < law_max; i++)
		if ((ccsr_read4(OCP85XX_LAWSR(i)) & 0x80000000) == 0)
			break;

	if (i == law_max)
		return (ENOSPC);

	ccsr_write4(OCP85XX_LAWBAR(i), bar);
	ccsr_write4(OCP85XX_LAWSR(i), sr);
	return (0);
}

int
law_disable(int trgt, u_long addr, u_long size)
{
	uint32_t bar, sr;
	int i, law_max;

	law_max = law_getmax();
	bar = _LAW_BAR(addr);
	sr = _LAW_SR(trgt, size);

	/* Find and disable requested LAW. */
	for (i = 0; i < law_max; i++)
		if (sr == ccsr_read4(OCP85XX_LAWSR(i)) &&
		    bar == ccsr_read4(OCP85XX_LAWBAR(i))) {
			ccsr_write4(OCP85XX_LAWBAR(i), 0);
			ccsr_write4(OCP85XX_LAWSR(i), 0);
			return (0);
		}

	return (ENOENT);
}

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

	if (ver == SVR_MPC8572E || ver == SVR_MPC8572 ||
	    ver == SVR_MPC8548E || ver == SVR_MPC8548)
		/* 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);
}