freebsd-dev/sys/powerpc/powermac/grackle.c
Zbigniew Bodek c43a86743c Reduce OFW PCI code duplication - involves ARM, PPC and SPARC64
Import portions of the PowerPC OF PCI implementation into new file
"ofwpci.c", common for other platforms. The files ofw_pci.c and ofw_pci.h
from sys/powerpc/ofw no longer exist. All required declarations are moved
to sys/dev/ofw/ofwpci.h. This creates a new ofw_pci_write_ivar() function
and modifies some others methods. Most functions contain existing ppc
implementations in the majority unchanged. Now there is no need to have
multiple identical copies of methods for various architectures.

Requested by:  jhibbits
Reviewed by:   jhibbits, marius
Submitted by:  Marcin Mazurek <mma@semihalf.com>
Obtained from: Semihalf
Sponsored by:  Annapurna Labs
Differential Revision: https://reviews.freebsd.org/D4879
2016-03-29 15:19:56 +00:00

324 lines
7.5 KiB
C

/*-
* Copyright 2003 by Peter Grehan. 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 ``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/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/ofwpci.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/pio.h>
#include <machine/resource.h>
#include <powerpc/powermac/gracklevar.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include "pcib_if.h"
/*
* Device interface.
*/
static int grackle_probe(device_t);
static int grackle_attach(device_t);
/*
* pcib interface.
*/
static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int,
u_int, int);
static void grackle_write_config(device_t, u_int, u_int, u_int,
u_int, u_int32_t, int);
/*
* Local routines.
*/
static int grackle_enable_config(struct grackle_softc *, u_int,
u_int, u_int, u_int);
static void grackle_disable_config(struct grackle_softc *);
static int badaddr(void *, size_t);
/*
* Driver methods.
*/
static device_method_t grackle_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, grackle_probe),
DEVMETHOD(device_attach, grackle_attach),
/* pcib interface */
DEVMETHOD(pcib_read_config, grackle_read_config),
DEVMETHOD(pcib_write_config, grackle_write_config),
DEVMETHOD_END
};
static devclass_t grackle_devclass;
DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
sizeof(struct grackle_softc), ofw_pci_driver);
DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0);
static int
grackle_probe(device_t dev)
{
const char *type, *compatible;
type = ofw_bus_get_type(dev);
compatible = ofw_bus_get_compat(dev);
if (type == NULL || compatible == NULL)
return (ENXIO);
if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
return (ENXIO);
device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
return (0);
}
static int
grackle_attach(device_t dev)
{
struct grackle_softc *sc;
sc = device_get_softc(dev);
/*
* The Grackle PCI config addr/data registers are actually in
* PCI space, but since they are needed to actually probe the
* PCI bus, use the fact that they are also available directly
* on the processor bus and map them
*/
sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
return (ofw_pci_attach(dev));
}
static u_int32_t
grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
int width)
{
struct grackle_softc *sc;
vm_offset_t caoff;
u_int32_t retval = 0xffffffff;
sc = device_get_softc(dev);
caoff = sc->sc_data + (reg & 0x03);
if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
/*
* Config probes to non-existent devices on the
* secondary bus generates machine checks. Be sure
* to catch these.
*/
if (bus > 0) {
if (badaddr((void *)sc->sc_data, 4)) {
return (retval);
}
}
switch (width) {
case 1:
retval = (in8rb(caoff));
break;
case 2:
retval = (in16rb(caoff));
break;
case 4:
retval = (in32rb(caoff));
break;
}
}
grackle_disable_config(sc);
return (retval);
}
static void
grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
u_int reg, u_int32_t val, int width)
{
struct grackle_softc *sc;
vm_offset_t caoff;
sc = device_get_softc(dev);
caoff = sc->sc_data + (reg & 0x03);
if (grackle_enable_config(sc, bus, slot, func, reg)) {
switch (width) {
case 1:
out8rb(caoff, val);
(void)in8rb(caoff);
break;
case 2:
out16rb(caoff, val);
(void)in16rb(caoff);
break;
case 4:
out32rb(caoff, val);
(void)in32rb(caoff);
break;
}
}
grackle_disable_config(sc);
}
static int
grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
u_int func, u_int reg)
{
u_int32_t cfgval;
/*
* Unlike UniNorth, the format of the config word is the same
* for local (0) and remote busses.
*/
cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
| GRACKLE_CFG_ENABLE;
out32rb(sc->sc_addr, cfgval);
(void) in32rb(sc->sc_addr);
return (1);
}
static void
grackle_disable_config(struct grackle_softc *sc)
{
/*
* Clear the GRACKLE_CFG_ENABLE bit to prevent stray
* accesses from causing config cycles
*/
out32rb(sc->sc_addr, 0);
}
static int
badaddr(void *addr, size_t size)
{
struct thread *td;
jmp_buf env, *oldfaultbuf;
int x;
/* Get rid of any stale machine checks that have been waiting. */
__asm __volatile ("sync; isync");
td = curthread;
oldfaultbuf = td->td_pcb->pcb_onfault;
td->td_pcb->pcb_onfault = &env;
if (setjmp(env)) {
td->td_pcb->pcb_onfault = oldfaultbuf;
__asm __volatile ("sync");
return 1;
}
__asm __volatile ("sync");
switch (size) {
case 1:
x = *(volatile int8_t *)addr;
break;
case 2:
x = *(volatile int16_t *)addr;
break;
case 4:
x = *(volatile int32_t *)addr;
break;
default:
panic("badaddr: invalid size (%zd)", size);
}
/* Make sure we took the machine check, if we caused one. */
__asm __volatile ("sync; isync");
td->td_pcb->pcb_onfault = oldfaultbuf;
__asm __volatile ("sync"); /* To be sure. */
return (0);
}
/*
* Driver to swallow Grackle host bridges from the PCI bus side.
*/
static int
grackle_hb_probe(device_t dev)
{
if (pci_get_devid(dev) == 0x00021057) {
device_set_desc(dev, "Grackle Host to PCI bridge");
device_quiet(dev);
return (0);
}
return (ENXIO);
}
static int
grackle_hb_attach(device_t dev)
{
return (0);
}
static device_method_t grackle_hb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, grackle_hb_probe),
DEVMETHOD(device_attach, grackle_hb_attach),
{ 0, 0 }
};
static driver_t grackle_hb_driver = {
"grackle_hb",
grackle_hb_methods,
1,
};
static devclass_t grackle_hb_devclass;
DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0);