e1364adbae
I was wagering on DEC being elegant & numbering PCI buses normally on machines with one pchip. It looks like they went with consistent -- buses behind ppbs begin with bus 2.
176 lines
5.1 KiB
C
176 lines
5.1 KiB
C
/*-
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* Copyright (c) 1999 Andrew Gallatin
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <pci/pcivar.h>
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#include <alpha/pci/tsunamireg.h>
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#include <alpha/pci/tsunamivar.h>
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static devclass_t pcib_devclass;
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int tsunami_hoses[TSUNAMI_MAXHOSES+1] = {1,-1,-1,-1,-1};
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int tsunami_maxhoseno = 0;
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extern int tsunami_num_pchips;
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/*
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* This comment attempts to explain why and how we are mapping from
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* the DEQ assigned bus numbers to the FreeBSD assigned numbers.
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*
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* FreeBSD must number buses with monotonically increasing numbers for a
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* variety of reasons (pciconf, newbus, etc).
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*
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* DEQ numbers them (from what I can tell) on a per-hose bases. And
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* for some reason they seem to always leave bus 1 unused.
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*
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* When generating config space addrs, we need to know if we are
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* directly on the primary bus on that hose, or if we are behind a ppb.
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* We keep track of this by assigning hoses monotonically increasing
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* numbers. This fits nicely with DEQ not using bus number 1; I
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* assume that is what it as intended for. I guess we'll see if they
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* come out with a system using more than one pchip..
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*
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* Next, we must attempt to map the FreeBSD assigned numbers to the
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* numbers assigned by DEQ in order to generate proper config space
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* addrs. We store the next number past the 0th bus of our hose and
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* do subtraction to determine what the DEQ number should have been,
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* given a FreeBSD bus number. This is disgusting & quite possibly
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* wrong.
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*/
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int
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tsunami_bus_within_hose(int hose, int bus)
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{
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if (hose == bus)
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return 0;
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else
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return ( (bus - tsunami_hoses[hose]) + 1);
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}
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/*
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* this function supports pciconf ioctls
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*/
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int
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tsunami_hose_from_bus(int bus)
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{
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int i;
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if (bus < tsunami_maxhoseno)
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return bus;
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for (i = 1; i <= TSUNAMI_MAXHOSES && tsunami_hoses[i] != -1; i++){
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if(tsunami_hoses[i] >= bus)
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return i-1;
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}
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return i-1;
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}
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static int
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tsunami_pcib_probe(device_t dev)
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{
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static int error;
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device_t child;
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int lastbus;
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device_set_desc(dev, "21271 PCI host bus adapter");
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child = device_add_child(dev, "pci", -1);
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if (tsunami_maxhoseno) {
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lastbus = (device_get_unit(child) - 1);
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if (lastbus == 0) /* didn't have a ppb on hose 0 */
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lastbus++;
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tsunami_hoses[tsunami_maxhoseno] = lastbus;
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}
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if ((error = device_delete_child(dev, child)))
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panic("tsunami_pcib_probe: device_delete_child failed\n");
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child = device_add_child(dev, "pci", tsunami_maxhoseno);
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if (tsunami_maxhoseno != device_get_unit(child)) {
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printf("tsunami_pcib_probe: wanted unit %d ",
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tsunami_maxhoseno);
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printf(" got unit %d\n", device_get_unit(child));
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panic("tsunami_pcib_probe: incorrect bus numbering");
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}
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tsunami_maxhoseno++;
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return 0;
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}
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static int
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tsunami_pcib_read_ivar(device_t dev, device_t child, int which, u_long *result)
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{
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if (which == PCIB_IVAR_HOSE) {
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*result = *(int*) device_get_ivars(dev);
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return 0;
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}
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return ENOENT;
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}
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static device_method_t tsunami_pcib_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, tsunami_pcib_probe),
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DEVMETHOD(device_attach, bus_generic_attach),
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/* Bus interface */
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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DEVMETHOD(bus_read_ivar, tsunami_pcib_read_ivar),
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DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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{ 0, 0 }
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};
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static driver_t tsunami_pcib_driver = {
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"pcib",
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tsunami_pcib_methods,
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1,
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};
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DRIVER_MODULE(pcib, tsunami, tsunami_pcib_driver, pcib_devclass, 0, 0);
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