freebsd-skq/sys/powerpc/ofw/ofw_pcibus.c
jhb 9e4bb0297c Add a bus_null_rescan() method that always fails with an error.
Use this in place of kobj_error_method to disable BUS_RESCAN() on
PCI drivers that do not use the "standard" scanning algorithm.
2016-04-27 17:49:42 +00:00

382 lines
11 KiB
C

/*-
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000, BSDi
* Copyright (c) 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 unmodified, 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 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/module.h>
#include <sys/pciio.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/ofw_pci.h>
#include <dev/ofw/openfirm.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/resource.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pci_private.h>
#include "ofw_pcibus.h"
#include "pcib_if.h"
#include "pci_if.h"
typedef uint32_t ofw_pci_intr_t;
/* Methods */
static device_probe_t ofw_pcibus_probe;
static device_attach_t ofw_pcibus_attach;
static pci_alloc_devinfo_t ofw_pcibus_alloc_devinfo;
static pci_assign_interrupt_t ofw_pcibus_assign_interrupt;
static ofw_bus_get_devinfo_t ofw_pcibus_get_devinfo;
static bus_child_deleted_t ofw_pcibus_child_deleted;
static int ofw_pcibus_child_pnpinfo_str_method(device_t cbdev, device_t child,
char *buf, size_t buflen);
static void ofw_pcibus_enum_devtree(device_t dev, u_int domain, u_int busno);
static void ofw_pcibus_enum_bus(device_t dev, u_int domain, u_int busno);
static device_method_t ofw_pcibus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofw_pcibus_probe),
DEVMETHOD(device_attach, ofw_pcibus_attach),
/* Bus interface */
DEVMETHOD(bus_child_deleted, ofw_pcibus_child_deleted),
DEVMETHOD(bus_child_pnpinfo_str, ofw_pcibus_child_pnpinfo_str_method),
DEVMETHOD(bus_rescan, bus_null_rescan),
/* PCI interface */
DEVMETHOD(pci_alloc_devinfo, ofw_pcibus_alloc_devinfo),
DEVMETHOD(pci_assign_interrupt, ofw_pcibus_assign_interrupt),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_devinfo, ofw_pcibus_get_devinfo),
DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
DEVMETHOD_END
};
static devclass_t pci_devclass;
DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods,
sizeof(struct pci_softc), pci_driver);
DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0);
MODULE_VERSION(ofw_pcibus, 1);
MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1);
static int ofw_devices_only = 0;
TUNABLE_INT("hw.pci.ofw_devices_only", &ofw_devices_only);
static int
ofw_pcibus_probe(device_t dev)
{
if (ofw_bus_get_node(dev) == -1)
return (ENXIO);
device_set_desc(dev, "OFW PCI bus");
return (BUS_PROBE_DEFAULT);
}
static int
ofw_pcibus_attach(device_t dev)
{
u_int busno, domain;
int error;
error = pci_attach_common(dev);
if (error)
return (error);
domain = pcib_get_domain(dev);
busno = pcib_get_bus(dev);
/*
* Attach those children represented in the device tree.
*/
ofw_pcibus_enum_devtree(dev, domain, busno);
/*
* We now attach any laggard devices. FDT, for instance, allows
* the device tree to enumerate only some PCI devices. Apple's
* OF device tree on some Grackle-based hardware can also miss
* functions on multi-function cards.
*/
if (!ofw_devices_only)
ofw_pcibus_enum_bus(dev, domain, busno);
return (bus_generic_attach(dev));
}
struct pci_devinfo *
ofw_pcibus_alloc_devinfo(device_t dev)
{
struct ofw_pcibus_devinfo *dinfo;
dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
return (&dinfo->opd_dinfo);
}
static void
ofw_pcibus_enum_devtree(device_t dev, u_int domain, u_int busno)
{
device_t pcib;
struct ofw_pci_register pcir;
struct ofw_pcibus_devinfo *dinfo;
phandle_t node, child;
u_int func, slot;
int intline;
pcib = device_get_parent(dev);
node = ofw_bus_get_node(dev);
for (child = OF_child(node); child != 0; child = OF_peer(child)) {
if (OF_getencprop(child, "reg", (pcell_t *)&pcir,
sizeof(pcir)) == -1)
continue;
slot = OFW_PCI_PHYS_HI_DEVICE(pcir.phys_hi);
func = OFW_PCI_PHYS_HI_FUNCTION(pcir.phys_hi);
/* Some OFW device trees contain dupes. */
if (pci_find_dbsf(domain, busno, slot, func) != NULL)
continue;
/*
* The preset in the intline register is usually bogus. Reset
* it such that the PCI code will reroute the interrupt if
* needed.
*/
intline = PCI_INVALID_IRQ;
if (OF_getproplen(child, "interrupts") > 0)
intline = 0;
PCIB_WRITE_CONFIG(pcib, busno, slot, func, PCIR_INTLINE,
intline, 1);
/*
* Now set up the PCI and OFW bus layer devinfo and add it
* to the PCI bus.
*/
dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(pcib, dev,
domain, busno, slot, func);
if (dinfo == NULL)
continue;
if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
0) {
pci_freecfg((struct pci_devinfo *)dinfo);
continue;
}
dinfo->opd_dma_tag = NULL;
pci_add_child(dev, (struct pci_devinfo *)dinfo);
/*
* Some devices don't have an intpin set, but do have
* interrupts. These are fully specified, and set in the
* interrupts property, so add that value to the device's
* resource list.
*/
if (dinfo->opd_dinfo.cfg.intpin == 0)
ofw_bus_intr_to_rl(dev, child,
&dinfo->opd_dinfo.resources, NULL);
}
}
/*
* The following is an almost exact clone of pci_add_children(), with the
* addition that it (a) will not add children that have already been added,
* and (b) will set up the OFW devinfo to point to invalid values. This is
* to handle non-enumerated PCI children as exist in FDT and on the second
* function of the Rage 128 in my Blue & White G3.
*/
static void
ofw_pcibus_enum_bus(device_t dev, u_int domain, u_int busno)
{
device_t pcib;
struct ofw_pcibus_devinfo *dinfo;
int maxslots;
int s, f, pcifunchigh;
uint8_t hdrtype;
pcib = device_get_parent(dev);
maxslots = PCIB_MAXSLOTS(pcib);
for (s = 0; s <= maxslots; s++) {
pcifunchigh = 0;
f = 0;
DELAY(1);
hdrtype = PCIB_READ_CONFIG(pcib, busno, s, f, PCIR_HDRTYPE, 1);
if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
continue;
if (hdrtype & PCIM_MFDEV)
pcifunchigh = PCI_FUNCMAX;
for (f = 0; f <= pcifunchigh; f++) {
/* Filter devices we have already added */
if (pci_find_dbsf(domain, busno, s, f) != NULL)
continue;
dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(
pcib, dev, domain, busno, s, f);
if (dinfo == NULL)
continue;
dinfo->opd_dma_tag = NULL;
dinfo->opd_obdinfo.obd_node = -1;
dinfo->opd_obdinfo.obd_name = NULL;
dinfo->opd_obdinfo.obd_compat = NULL;
dinfo->opd_obdinfo.obd_type = NULL;
dinfo->opd_obdinfo.obd_model = NULL;
/*
* For non OFW-devices, don't believe 0
* for an interrupt.
*/
if (dinfo->opd_dinfo.cfg.intline == 0) {
dinfo->opd_dinfo.cfg.intline = PCI_INVALID_IRQ;
PCIB_WRITE_CONFIG(pcib, busno, s, f,
PCIR_INTLINE, PCI_INVALID_IRQ, 1);
}
pci_add_child(dev, (struct pci_devinfo *)dinfo);
}
}
}
static void
ofw_pcibus_child_deleted(device_t dev, device_t child)
{
struct ofw_pcibus_devinfo *dinfo;
dinfo = device_get_ivars(dev);
ofw_bus_gen_destroy_devinfo(&dinfo->opd_obdinfo);
pci_child_deleted(dev, child);
}
static int
ofw_pcibus_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
size_t buflen)
{
pci_child_pnpinfo_str_method(cbdev, child, buf, buflen);
if (ofw_bus_get_node(child) != -1) {
strlcat(buf, " ", buflen); /* Separate info */
ofw_bus_gen_child_pnpinfo_str(cbdev, child, buf, buflen);
}
return (0);
}
static int
ofw_pcibus_assign_interrupt(device_t dev, device_t child)
{
ofw_pci_intr_t intr[2];
phandle_t node, iparent;
int isz, icells;
node = ofw_bus_get_node(child);
if (node == -1) {
/* Non-firmware enumerated child, use standard routing */
intr[0] = pci_get_intpin(child);
return (PCIB_ROUTE_INTERRUPT(device_get_parent(dev), child,
intr[0]));
}
/*
* Try to determine the node's interrupt parent so we know which
* PIC to use.
*/
iparent = -1;
if (OF_getencprop(node, "interrupt-parent", &iparent,
sizeof(iparent)) < 0)
iparent = -1;
icells = 1;
if (iparent != -1)
OF_getencprop(OF_node_from_xref(iparent), "#interrupt-cells",
&icells, sizeof(icells));
/*
* Any AAPL,interrupts property gets priority and is
* fully specified (i.e. does not need routing)
*/
isz = OF_getencprop(node, "AAPL,interrupts", intr, sizeof(intr));
if (isz == sizeof(intr[0])*icells)
return ((iparent == -1) ? intr[0] : ofw_bus_map_intr(dev,
iparent, icells, intr));
isz = OF_getencprop(node, "interrupts", intr, sizeof(intr));
if (isz == sizeof(intr[0])*icells) {
if (iparent != -1)
intr[0] = ofw_bus_map_intr(dev, iparent, icells, intr);
} else {
/* No property: our best guess is the intpin. */
intr[0] = pci_get_intpin(child);
}
/*
* If we got intr from a property, it may or may not be an intpin.
* For on-board devices, it frequently is not, and is completely out
* of the valid intpin range. For PCI slots, it hopefully is,
* otherwise we will have trouble interfacing with non-OFW buses
* such as cardbus.
* Since we cannot tell which it is without violating layering, we
* will always use the route_interrupt method, and treat exceptions
* on the level they become apparent.
*/
return (PCIB_ROUTE_INTERRUPT(device_get_parent(dev), child, intr[0]));
}
static const struct ofw_bus_devinfo *
ofw_pcibus_get_devinfo(device_t bus, device_t dev)
{
struct ofw_pcibus_devinfo *dinfo;
dinfo = device_get_ivars(dev);
return (&dinfo->opd_obdinfo);
}