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/*-
* 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: src/sys/powerpc/mpc85xx/mpc85xx.c,v 1.6.2.2.2.1 2010/12/21 17:09:25 kensmith Exp $");
#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);
}
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