/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2011 Nathan Whitehorn
* 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.
*
* 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.
*/
#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/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 <machine/rtas.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <powerpc/pseries/plpar_iommu.h>
#include "pcib_if.h"
#include "iommu_if.h"
/*
* Device interface.
*/
static int rtaspci_probe(device_t);
static int rtaspci_attach(device_t);
/*
* pcib interface.
*/
static u_int32_t rtaspci_read_config(device_t, u_int, u_int, u_int,
u_int, int);
static void rtaspci_write_config(device_t, u_int, u_int, u_int,
u_int, u_int32_t, int);
/*
* Driver methods.
*/
static device_method_t rtaspci_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, rtaspci_probe),
DEVMETHOD(device_attach, rtaspci_attach),
/* pcib interface */
DEVMETHOD(pcib_read_config, rtaspci_read_config),
DEVMETHOD(pcib_write_config, rtaspci_write_config),
DEVMETHOD_END
};
struct rtaspci_softc {
struct ofw_pci_softc pci_sc;
struct ofw_pci_register sc_pcir;
cell_t read_pci_config, write_pci_config;
cell_t ex_read_pci_config, ex_write_pci_config;
int sc_extended_config;
};
DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods,
sizeof(struct rtaspci_softc), ofw_pcib_driver);
DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, 0, 0);
static int
rtaspci_probe(device_t dev)
{
const char *type;
if (!rtas_exists())
return (ENXIO);
type = ofw_bus_get_type(dev);
if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0)
return (ENXIO);
if (type == NULL || strcmp(type, "pci") != 0)
return (ENXIO);
device_set_desc(dev, "RTAS Host-PCI bridge");
return (BUS_PROBE_GENERIC);
}
static int
rtaspci_attach(device_t dev)
{
struct rtaspci_softc *sc;
sc = device_get_softc(dev);
if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir,
sizeof(sc->sc_pcir)) == -1)
return (ENXIO);
sc->read_pci_config = rtas_token_lookup("read-pci-config");
sc->write_pci_config = rtas_token_lookup("write-pci-config");
sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config");
sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config");
sc->sc_extended_config = 0;
OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type",
&sc->sc_extended_config, sizeof(sc->sc_extended_config));
return (ofw_pcib_attach(dev));
}
static uint32_t
rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
int width)
{
struct rtaspci_softc *sc;
uint32_t retval = 0xffffffff;
uint32_t config_addr;
int error, pcierror;
sc = device_get_softc(dev);
config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
((func & 0x7) << 8) | (reg & 0xff);
if (sc->sc_extended_config)
config_addr |= (reg & 0xf00) << 16;
if (sc->ex_read_pci_config != -1)
error = rtas_call_method(sc->ex_read_pci_config, 4, 2,
config_addr, sc->sc_pcir.phys_hi,
sc->sc_pcir.phys_mid, width, &pcierror, &retval);
else
error = rtas_call_method(sc->read_pci_config, 2, 2,
config_addr, width, &pcierror, &retval);
/* Sign-extend output */
switch (width) {
case 1:
retval = (int32_t)(int8_t)(retval);
break;
case 2:
retval = (int32_t)(int16_t)(retval);
break;
}
if (error < 0 || pcierror != 0)
retval = 0xffffffff;
return (retval);
}
static void
rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
u_int reg, uint32_t val, int width)
{
struct rtaspci_softc *sc;
uint32_t config_addr;
int pcierror;
sc = device_get_softc(dev);
config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
((func & 0x7) << 8) | (reg & 0xff);
if (sc->sc_extended_config)
config_addr |= (reg & 0xf00) << 16;
if (sc->ex_write_pci_config != -1)
rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr,
sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid,
width, val, &pcierror);
else
rtas_call_method(sc->write_pci_config, 3, 1, config_addr,
width, val, &pcierror);
}
