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/*
* Copyright (C) 1996 Wolfgang Solfrank.
* Copyright (C) 1996 TooLs GmbH.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
/*-
* Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
* 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 THE AUTHOR ``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 THE 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.
*
* from: $NetBSD: ofw_machdep.c,v 1.16 2001/07/20 00:07:14 eeh Exp $
*
* $FreeBSD$
*/
/*
* OpenFirmware bus support code that is (hopefully) independent from the used
* hardware.
* Maybe this should go into dev/ofw/; there may however be sparc specific
* bits left.
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <ofw/openfirm.h>
#include <machine/ofw_bus.h>
/*
* Other than in OpenFirmware calls, the size of a bus cell seems to be always
* the same.
*/
typedef u_int32_t pcell_t;
static int
ofw_bus_searchprop(phandle_t node, char *propname, void *buf, int buflen)
{
int rv;
for (; node != 0; node = OF_parent(node)) {
if ((rv = OF_getprop(node, propname, buf, buflen)) != -1)
return (rv);
}
return (-1);
}
/*
* Map an interrupt using the firmware reg, interrupt-map and
* interrupt-map-mask properties.
* The interrupt is returned in *result, which is malloc()'ed. The size of
* the interrupt specifiaction is returned.
*/
static int
ofw_bus_find_intr(u_int8_t *intr, int intrsz, u_int8_t *regs, int physsz,
u_int8_t *imap, int imapsz, u_int8_t *imapmsk, u_int8_t **result)
{
phandle_t parent;
char *ref;
u_int8_t *mptr;
pcell_t pintrsz;
int i, rsz, tsz;
rsz = -1;
ref = malloc(physsz + intrsz, M_TEMP, 0);
if (imapmsk != NULL) {
for (i = 0; i < physsz; i++)
ref[i] = regs[i] & imapmsk[i];
for (i = 0; i < intrsz; i++)
ref[physsz + i] = intr[i] & imapmsk[physsz + i];
} else {
bcopy(regs, ref, physsz);
bcopy(intr, ref + physsz, intrsz);
}
mptr = imap;
i = imapsz;
while (i > 0) {
KASSERT(i >= physsz + sizeof(parent),
("ofw_bus_find_intr: truncated map"));
bcopy(mptr + physsz + intrsz, &parent, sizeof(parent));
if (ofw_bus_searchprop(parent, "#interrupt-cells",
&pintrsz, sizeof(pintrsz)) == -1)
pintrsz = 1; /* default */
pintrsz *= sizeof(pcell_t);
KASSERT(i >= physsz + intrsz + sizeof(parent) +
pintrsz, ("ofw_bus_find_intr: truncated map"));
if (bcmp(ref, mptr, physsz + intrsz) == 0) {
*result = malloc(pintrsz, M_OFWPROP, 0);
bcopy(mptr + physsz + intrsz + sizeof(parent),
*result, pintrsz);
rsz = pintrsz;
break;
}
tsz = physsz + intrsz + sizeof(phandle_t) + pintrsz;
mptr += tsz;
i -= tsz;
}
free(ref, M_TEMP);
return (rsz);
}
/*
* Apply the OpenFirmware algorithm for mapping an interrupt. First, the
* 'interrupts' and 'reg' properties are retrieved; those are matched against
* the interrupt map of the next higher node. If there is no match or no such
* propery, we go to the next higher node, using the 'reg' property of the node
* that was just processed unusccessfully.
* When a match occurs, we should continue to search, using the new interrupt
* specification that was just found; this is currently not performed
* (see below).
* When the root node is reached with at least one successful mapping performed,
* and the format is right, the interrupt number is returned.
*
* This should work for all bus systems.
*/
u_int32_t
ofw_bus_route_intr(phandle_t node, int intrp, obr_callback_t *cb)
{
u_int8_t *reg, *intr, *tintr, *imap, *imapmsk;
phandle_t parent;
pcell_t addrc, ic;
u_int32_t rv;
int regsz, tisz, isz, imapsz, found;
found = 0;
reg = imap = imapmsk = NULL;
if (intrp == ORIP_NOINT) {
isz = OF_getprop_alloc(node, "interrupts", 1, (void **)&intr);
if (isz < 0)
return (ORIR_NOTFOUND);
} else {
ic = intrp;
isz = sizeof(ic);
intr = malloc(isz, M_OFWPROP, 0);
bcopy(&ic, intr, isz);
}
/*
* Note that apparently, remapping at multiple levels is allowed;
* however, this causes problems with EBus at least, and seems to never
* be needed, so we disable it for now (*sigh*).
*/
for (parent = OF_parent(node); parent != 0 && !found;
parent = OF_parent(node = parent)) {
if (reg != NULL)
free(reg, M_OFWPROP);
regsz = OF_getprop_alloc(node, "reg", 1, (void **)®);
if (regsz < 0)
panic("ofw_bus_route_intr: could not get reg property");
imapsz = OF_getprop_alloc(parent, "interrupt-map", 1,
(void **)&imap);
if (imapsz == -1) {
/*
* Use the callback to allow caller-specific workarounds
* for firmware bugs (missing properties).
*/
if (cb != NULL) {
tisz = cb(parent, intr, isz, reg, regsz, &tintr,
&found);
if (tisz != -1) {
isz = tisz;
free(intr, M_OFWPROP);
intr = tintr;
}
}
continue;
}
if (OF_getprop(parent, "#address-cells", &addrc,
sizeof(addrc)) == -1)
addrc = 2;
addrc *= sizeof(pcell_t);
/*
* Failures to get the mask are ignored; a full mask is assumed
* in this case.
*/
OF_getprop_alloc(parent, "interrupt-map-mask", 1,
(void **)&imapmsk);
tisz = ofw_bus_find_intr(intr, isz, reg, addrc, imap, imapsz,
imapmsk, &tintr);
if (tisz != -1) {
found = 1;
isz = tisz;
free(intr, M_OFWPROP);
intr = tintr;
}
free(imap, M_OFWPROP);
if (imapmsk != NULL)
free(imapmsk, M_OFWPROP);
}
if (reg != NULL)
free(reg, M_OFWPROP);
#if 0
/*
* Obviously there are some boxes that don't require mapping at all,
* for example the U30, which has no interrupt maps for children of
* the root PCI bus.
*/
if (!found) {
if (intrp != ORIP_NOINT)
return (ORIR_NOTFOUND);
panic("ofw_bus_route_intr: 'interrupts' property, but no "
"mapping found");
}
#endif
KASSERT(isz == sizeof(u_int32_t),
("ofw_bus_route_intr: bad interrupt spec size %d", isz));
bcopy(intr, &rv, sizeof(rv));
free(intr, M_OFWPROP);
return (rv);
}
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