freebsd-dev/sys/sparc64/pci/apb.c

375 lines
10 KiB
C
Raw Normal View History

/*-
* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000 BSDi
* Copyright (c) 2001 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
*
* $FreeBSD$
*/
/*
* 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 pf the pcib methods anyway.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>
#include <machine/resource.h>
#include <sparc64/pci/ofw_pci.h>
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include "pcib_if.h"
/*
* Bridge-specific data.
*/
struct apb_softc {
device_t dev;
u_int8_t secbus; /* secondary bus number */
u_int8_t subbus; /* subordinate bus number */
u_int8_t iomap;
u_int8_t memmap;
};
static int apb_probe(device_t dev);
static int apb_attach(device_t dev);
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);
static int apb_read_ivar(device_t dev, device_t child, int which,
uintptr_t *result);
static int apb_write_ivar(device_t dev, device_t child, int which,
uintptr_t value);
static int apb_maxslots(device_t dev);
static u_int32_t apb_read_config(device_t dev, int b, int s, int f, int reg,
int width);
static void apb_write_config(device_t dev, int b, int s, int f, int reg,
u_int32_t val, int width);
static int apb_route_interrupt(device_t pcib, device_t dev, int pin);
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, apb_read_ivar),
DEVMETHOD(bus_write_ivar, apb_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, apb_maxslots),
DEVMETHOD(pcib_read_config, apb_read_config),
DEVMETHOD(pcib_write_config, apb_write_config),
DEVMETHOD(pcib_route_interrupt, apb_route_interrupt),
{ 0, 0 }
};
static driver_t apb_driver = {
"pcib",
apb_methods,
sizeof(struct apb_softc),
};
static devclass_t apb_devclass;
DRIVER_MODULE(apb, pci, apb_driver, apb_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;
device_t child;
sc = device_get_softc(dev);
sc->dev = dev;
/*
* Get current bridge configuration.
*/
sc->secbus = pci_read_config(dev, PCIR_SECBUS_1, 1);
sc->subbus = pci_read_config(dev, PCIR_SUBBUS_1, 1);
sc->iomap = pci_read_config(dev, APBR_IOMAP, 1);
sc->memmap = pci_read_config(dev, APBR_MEMMAP, 1);
if (bootverbose) {
device_printf(dev, " secondary bus %d\n", sc->secbus);
device_printf(dev, " subordinate bus %d\n", sc->subbus);
device_printf(dev, " I/O decode ");
apb_map_print(sc->iomap, APB_IO_SCALE);
printf("\n");
device_printf(dev, " memory decode ");
apb_map_print(sc->memmap, APB_MEM_SCALE);
printf("\n");
}
/*
* XXX If the subordinate bus number is less than the secondary bus
* number, we should pick a better value. One sensible alternative
* would be to pick 255; the only tradeoff here is that configuration
* transactions would be more widely routed than absolutely necessary.
*/
if (sc->secbus != 0) {
child = device_add_child(dev, "pci", -1);
if (child != NULL)
return (bus_generic_attach(dev));
} else
panic("apb_attach: APB with uninitialized secbus");
/* no secondary bus; we should have fixed this */
return (0);
}
/*
* 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->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->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->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->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));
}
static int
apb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct apb_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
*result = sc->secbus;
return (0);
}
return (ENOENT);
}
static int
apb_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
struct apb_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
sc->secbus = value;
break;
}
return (ENOENT);
}
/*
* PCIB interface.
*/
static int
apb_maxslots(device_t dev)
{
return (PCI_SLOTMAX);
}
/*
* Since we are a child of a PCI bus, its parent must support the pcib
* interface.
*/
static u_int32_t
apb_read_config(device_t dev, int b, int s, int f, int reg, int width)
{
return (PCIB_READ_CONFIG(device_get_parent(device_get_parent(dev)), b,
s, f, reg, width));
}
static void
apb_write_config(device_t dev, int b, int s, int f, int reg, u_int32_t val,
int width)
{
PCIB_WRITE_CONFIG(device_get_parent(device_get_parent(dev)), b, s, f, reg,
val, width);
}
/*
* Route an interrupt across a PCI bridge - we need to rely on the firmware
* here.
*/
static int
apb_route_interrupt(device_t pcib, device_t dev, int pin)
{
/*
* XXX: ugly loathsome hack:
* We can't use ofw_pci_route_intr() here; the device passed may be
* the one of a bridge, so the original device can't be recovered.
*
* We need to use the firmware to route interrupts, however it has
* no interface which could be used to interpret intpins; instead,
* all assignments are done by device.
*
* The MI pci code will try to reroute interrupts of 0, although they
* are correct; all other interrupts are preinitialized, so if we
* get here, the intline is either 0 (so return 0), or we hit a
* device which was not preinitialized (e.g. hotplugged stuff), in
* which case we are lost.
*/
return (0);
}