rtas_pci.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2011 Nathan Whitehorn
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/module.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/rman.h>
   38 
   39 #include <dev/ofw/openfirm.h>
   40 #include <dev/ofw/ofw_pci.h>
   41 #include <dev/ofw/ofw_bus.h>
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 #include <dev/ofw/ofwpci.h>
   44 
   45 #include <dev/pci/pcivar.h>
   46 #include <dev/pci/pcireg.h>
   47 
   48 #include <machine/bus.h>
   49 #include <machine/intr_machdep.h>
   50 #include <machine/md_var.h>
   51 #include <machine/pio.h>
   52 #include <machine/resource.h>
   53 #include <machine/rtas.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/pmap.h>
   57 
   58 #include <powerpc/pseries/plpar_iommu.h>
   59 
   60 #include "pcib_if.h"
   61 #include "iommu_if.h"
   62 
   63 /*
   64  * Device interface.
   65  */
   66 static int              rtaspci_probe(device_t);
   67 static int              rtaspci_attach(device_t);
   68 
   69 /*
   70  * pcib interface.
   71  */
   72 static u_int32_t        rtaspci_read_config(device_t, u_int, u_int, u_int,
   73                             u_int, int);
   74 static void             rtaspci_write_config(device_t, u_int, u_int, u_int,
   75                             u_int, u_int32_t, int);
   76 
   77 /*
   78  * Driver methods.
   79  */
   80 static device_method_t  rtaspci_methods[] = {
   81         /* Device interface */
   82         DEVMETHOD(device_probe,         rtaspci_probe),
   83         DEVMETHOD(device_attach,        rtaspci_attach),
   84 
   85         /* pcib interface */
   86         DEVMETHOD(pcib_read_config,     rtaspci_read_config),
   87         DEVMETHOD(pcib_write_config,    rtaspci_write_config),
   88 
   89         DEVMETHOD_END
   90 };
   91 
   92 struct rtaspci_softc {
   93         struct ofw_pci_softc    pci_sc;
   94 
   95         struct ofw_pci_register sc_pcir;
   96 
   97         cell_t                  read_pci_config, write_pci_config;
   98         cell_t                  ex_read_pci_config, ex_write_pci_config;
   99         int                     sc_extended_config;
  100 };
  101 
  102 DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods,
  103     sizeof(struct rtaspci_softc), ofw_pcib_driver);
  104 DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, 0, 0);
  105 
  106 static int
  107 rtaspci_probe(device_t dev)
  108 {
  109         const char      *type;
  110 
  111         if (!rtas_exists())
  112                 return (ENXIO);
  113 
  114         type = ofw_bus_get_type(dev);
  115 
  116         if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0)
  117                 return (ENXIO);
  118         if (type == NULL || strcmp(type, "pci") != 0)
  119                 return (ENXIO);
  120 
  121         device_set_desc(dev, "RTAS Host-PCI bridge");
  122         return (BUS_PROBE_GENERIC);
  123 }
  124 
  125 static int
  126 rtaspci_attach(device_t dev)
  127 {
  128         struct          rtaspci_softc *sc;
  129 
  130         sc = device_get_softc(dev);
  131 
  132         if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir,
  133             sizeof(sc->sc_pcir)) == -1)
  134                 return (ENXIO);
  135 
  136         sc->read_pci_config = rtas_token_lookup("read-pci-config");
  137         sc->write_pci_config = rtas_token_lookup("write-pci-config");
  138         sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config");
  139         sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config");
  140 
  141         sc->sc_extended_config = 0;
  142         OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type",
  143             &sc->sc_extended_config, sizeof(sc->sc_extended_config));
  144 
  145         return (ofw_pcib_attach(dev));
  146 }
  147 
  148 static uint32_t
  149 rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
  150     int width)
  151 {
  152         struct rtaspci_softc *sc;
  153         uint32_t retval = 0xffffffff;
  154         uint32_t config_addr;
  155         int error, pcierror;
  156 
  157         sc = device_get_softc(dev);
  158 
  159         config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
  160             ((func & 0x7) << 8) | (reg & 0xff);
  161         if (sc->sc_extended_config)
  162                 config_addr |= (reg & 0xf00) << 16;
  163                 
  164         if (sc->ex_read_pci_config != -1)
  165                 error = rtas_call_method(sc->ex_read_pci_config, 4, 2,
  166                     config_addr, sc->sc_pcir.phys_hi,
  167                     sc->sc_pcir.phys_mid, width, &pcierror, &retval);
  168         else
  169                 error = rtas_call_method(sc->read_pci_config, 2, 2,
  170                     config_addr, width, &pcierror, &retval);
  171 
  172         /* Sign-extend output */
  173         switch (width) {
  174         case 1:
  175                 retval = (int32_t)(int8_t)(retval);
  176                 break;
  177         case 2:
  178                 retval = (int32_t)(int16_t)(retval);
  179                 break;
  180         }
  181 
  182         if (error < 0 || pcierror != 0)
  183                 retval = 0xffffffff;
  184 
  185         return (retval);
  186 }
  187 
  188 static void
  189 rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func,
  190     u_int reg, uint32_t val, int width)
  191 {
  192         struct rtaspci_softc *sc;
  193         uint32_t config_addr;
  194         int pcierror;
  195 
  196         sc = device_get_softc(dev);
  197 
  198         config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) |
  199             ((func & 0x7) << 8) | (reg & 0xff);
  200         if (sc->sc_extended_config)
  201                 config_addr |= (reg & 0xf00) << 16;
  202                 
  203         if (sc->ex_write_pci_config != -1)
  204                 rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr,
  205                     sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid,
  206                     width, val, &pcierror);
  207         else
  208                 rtas_call_method(sc->write_pci_config, 3, 1, config_addr,
  209                     width, val, &pcierror);
  210 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/pseries/rtas_pci.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/pseries/rtas_pci.c