FreeBSD-5.3/sys/sparc64/pci/apb.c
/*-
* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000 BSDi
* Copyright (c) 2001, 2003 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE 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 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: FreeBSD: src/sys/dev/pci/pci_pci.c,v 1.3 2000/12/13
*
* $FreeBSD: src/sys/sparc64/pci/apb.c,v 1.10 2004/08/12 17:41:32 marius Exp $
*/
/*
* Support for the Sun APB (Advanced PCI Bridge) PCI-PCI bridge.
* This bridge does not fully comply to the PCI bridge specification, and is
* therefore not supported by the generic driver.
* We can use some of the pcib methods anyway.
*/
#include "opt_ofw_pci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>
#include <machine/bus.h>
#include <machine/ofw_bus.h>
#include <machine/resource.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
#include <sparc64/pci/ofw_pci.h>
#include <sparc64/pci/ofw_pcib_subr.h>
/*
* Bridge-specific data.
*/
struct apb_softc {
struct ofw_pcib_gen_softc sc_bsc;
u_int8_t sc_iomap;
u_int8_t sc_memmap;
};
static device_probe_t apb_probe;
static device_attach_t apb_attach;
static bus_alloc_resource_t apb_alloc_resource;
static device_method_t apb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, apb_probe),
DEVMETHOD(device_attach, apb_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_read_ivar, pcib_read_ivar),
DEVMETHOD(bus_write_ivar, pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, apb_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, pcib_maxslots),
DEVMETHOD(pcib_read_config, pcib_read_config),
DEVMETHOD(pcib_write_config, pcib_write_config),
DEVMETHOD(pcib_route_interrupt, ofw_pcib_gen_route_interrupt),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, ofw_pcib_gen_get_node),
/* ofw_pci interface */
DEVMETHOD(ofw_pci_adjust_busrange, ofw_pcib_gen_adjust_busrange),
{ 0, 0 }
};
static driver_t apb_driver = {
"pcib",
apb_methods,
sizeof(struct apb_softc),
};
DRIVER_MODULE(apb, pci, apb_driver, pcib_devclass, 0, 0);
/* APB specific registers */
#define APBR_IOMAP 0xde
#define APBR_MEMMAP 0xdf
/* Definitions for the mapping registers */
#define APB_IO_SCALE 0x200000
#define APB_MEM_SCALE 0x20000000
/*
* Generic device interface
*/
static int
apb_probe(device_t dev)
{
if (pci_get_vendor(dev) == 0x108e && /* Sun */
pci_get_device(dev) == 0x5000) { /* APB */
device_set_desc(dev, "APB PCI-PCI bridge");
return (0);
}
return (ENXIO);
}
static void
apb_map_print(u_int8_t map, u_long scale)
{
int i, first;
for (first = 1, i = 0; i < 8; i++) {
if ((map & (1 << i)) != 0) {
printf("%s0x%lx-0x%lx", first ? "" : ", ",
i * scale, (i + 1) * scale - 1);
first = 0;
}
}
}
static int
apb_map_checkrange(u_int8_t map, u_long scale, u_long start, u_long end)
{
int i, ei;
i = start / scale;
ei = end / scale;
if (i > 7 || ei > 7)
return (0);
for (; i <= ei; i++)
if ((map & (1 << i)) == 0)
return (0);
return (1);
}
static int
apb_attach(device_t dev)
{
struct apb_softc *sc;
sc = device_get_softc(dev);
/*
* Get current bridge configuration.
*/
sc->sc_iomap = pci_read_config(dev, APBR_IOMAP, 1);
sc->sc_memmap = pci_read_config(dev, APBR_MEMMAP, 1);
ofw_pcib_gen_setup(dev);
if (bootverbose) {
device_printf(dev, " secondary bus %d\n",
sc->sc_bsc.ops_pcib_sc.secbus);
device_printf(dev, " subordinate bus %d\n",
sc->sc_bsc.ops_pcib_sc.subbus);
device_printf(dev, " I/O decode ");
apb_map_print(sc->sc_iomap, APB_IO_SCALE);
printf("\n");
device_printf(dev, " memory decode ");
apb_map_print(sc->sc_memmap, APB_MEM_SCALE);
printf("\n");
}
device_add_child(dev, "pci", sc->sc_bsc.ops_pcib_sc.secbus);
return (bus_generic_attach(dev));
}
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
static struct resource *
apb_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct apb_softc *sc;
sc = device_get_softc(dev);
/*
* If this is a "default" allocation against this rid, we can't work
* out where it's coming from (we should actually never see these) so
* we just have to punt.
*/
if ((start == 0) && (end == ~0)) {
device_printf(dev, "can't decode default resource id %d for "
"%s%d, bypassing\n", *rid, device_get_name(child),
device_get_unit(child));
} else {
/*
* Fail the allocation for this range if it's not supported.
* XXX we should probably just fix up the bridge decode and
* soldier on.
*/
switch (type) {
case SYS_RES_IOPORT:
if (!apb_map_checkrange(sc->sc_iomap, APB_IO_SCALE,
start, end)) {
device_printf(dev, "device %s%d requested "
"unsupported I/O range 0x%lx-0x%lx\n",
device_get_name(child),
device_get_unit(child), start, end);
return (NULL);
}
if (bootverbose)
device_printf(sc->sc_bsc.ops_pcib_sc.dev,
"device %s%d requested decoded I/O range "
"0x%lx-0x%lx\n", device_get_name(child),
device_get_unit(child), start, end);
break;
case SYS_RES_MEMORY:
if (!apb_map_checkrange(sc->sc_memmap, APB_MEM_SCALE,
start, end)) {
device_printf(dev, "device %s%d requested "
"unsupported memory range 0x%lx-0x%lx\n",
device_get_name(child),
device_get_unit(child), start, end);
return (NULL);
}
if (bootverbose)
device_printf(sc->sc_bsc.ops_pcib_sc.dev,
"device %s%d requested decoded memory "
"range 0x%lx-0x%lx\n",
device_get_name(child),
device_get_unit(child), start, end);
break;
default:
break;
}
}
/*
* Bridge is OK decoding this resource, so pass it up.
*/
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags));
}