ofw_pcibus.c

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    1 /*-
    2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
    3  * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
    4  * Copyright (c) 2000, BSDi
    5  * Copyright (c) 2003, Thomas Moestl <tmm@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/bus.h>
   35 #include <sys/kernel.h>
   36 #include <sys/libkern.h>
   37 #include <sys/module.h>
   38 #include <sys/pciio.h>
   39 
   40 #include <dev/ofw/ofw_bus.h>
   41 #include <dev/ofw/ofw_bus_subr.h>
   42 #include <dev/ofw/ofw_pci.h>
   43 #include <dev/ofw/openfirm.h>
   44 
   45 #include <machine/bus.h>
   46 #include <machine/intr_machdep.h>
   47 #include <machine/resource.h>
   48 
   49 #include <dev/pci/pcireg.h>
   50 #include <dev/pci/pcivar.h>
   51 #include <dev/pci/pci_private.h>
   52 
   53 #include "pcib_if.h"
   54 #include "pci_if.h"
   55 
   56 typedef uint32_t ofw_pci_intr_t;
   57 
   58 /* Methods */
   59 static device_probe_t ofw_pcibus_probe;
   60 static device_attach_t ofw_pcibus_attach;
   61 static pci_assign_interrupt_t ofw_pcibus_assign_interrupt;
   62 static ofw_bus_get_devinfo_t ofw_pcibus_get_devinfo;
   63 static int ofw_pcibus_child_pnpinfo_str_method(device_t cbdev, device_t child,
   64     char *buf, size_t buflen);
   65 
   66 static void ofw_pcibus_enum_devtree(device_t dev, u_int domain, u_int busno);
   67 static void ofw_pcibus_enum_bus(device_t dev, u_int domain, u_int busno);
   68 
   69 static device_method_t ofw_pcibus_methods[] = {
   70         /* Device interface */
   71         DEVMETHOD(device_probe,         ofw_pcibus_probe),
   72         DEVMETHOD(device_attach,        ofw_pcibus_attach),
   73 
   74         /* Bus interface */
   75         DEVMETHOD(bus_child_pnpinfo_str, ofw_pcibus_child_pnpinfo_str_method),
   76 
   77         /* PCI interface */
   78         DEVMETHOD(pci_assign_interrupt, ofw_pcibus_assign_interrupt),
   79 
   80         /* ofw_bus interface */
   81         DEVMETHOD(ofw_bus_get_devinfo,  ofw_pcibus_get_devinfo),
   82         DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
   83         DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
   84         DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
   85         DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
   86         DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
   87 
   88         { 0, 0 }
   89 };
   90 
   91 struct ofw_pcibus_devinfo {
   92         struct pci_devinfo      opd_dinfo;
   93         struct ofw_bus_devinfo  opd_obdinfo;
   94 };
   95 
   96 static devclass_t pci_devclass;
   97 
   98 DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods,
   99     sizeof(struct pci_softc), pci_driver);
  100 DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0);
  101 MODULE_VERSION(ofw_pcibus, 1);
  102 MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1);
  103 
  104 static int
  105 ofw_pcibus_probe(device_t dev)
  106 {
  107 
  108         if (ofw_bus_get_node(dev) == 0)
  109                 return (ENXIO);
  110         device_set_desc(dev, "OFW PCI bus");
  111 
  112         return (0);
  113 }
  114 
  115 static int
  116 ofw_pcibus_attach(device_t dev)
  117 {
  118         u_int busno, domain;
  119         int error;
  120 
  121         error = pci_attach_common(dev);
  122         if (error)
  123                 return (error);
  124         domain = pcib_get_domain(dev);
  125         busno = pcib_get_bus(dev);
  126 
  127         /*
  128          * Attach those children represented in the device tree.
  129          */
  130 
  131         ofw_pcibus_enum_devtree(dev, domain, busno);
  132 
  133         /*
  134          * We now attach any laggard devices. FDT, for instance, allows
  135          * the device tree to enumerate only some PCI devices. Apple's
  136          * OF device tree on some Grackle-based hardware can also miss
  137          * functions on multi-function cards.
  138          */
  139 
  140         ofw_pcibus_enum_bus(dev, domain, busno);
  141 
  142         return (bus_generic_attach(dev));
  143 }
  144 
  145 static void
  146 ofw_pcibus_enum_devtree(device_t dev, u_int domain, u_int busno)
  147 {
  148         device_t pcib;
  149         struct ofw_pci_register pcir;
  150         struct ofw_pcibus_devinfo *dinfo;
  151         phandle_t node, child;
  152         u_int func, slot;
  153         int intline;
  154 
  155         pcib = device_get_parent(dev);
  156         node = ofw_bus_get_node(dev);
  157 
  158         for (child = OF_child(node); child != 0; child = OF_peer(child)) {
  159                 if (OF_getprop(child, "reg", &pcir, sizeof(pcir)) == -1)
  160                         continue;
  161                 slot = OFW_PCI_PHYS_HI_DEVICE(pcir.phys_hi);
  162                 func = OFW_PCI_PHYS_HI_FUNCTION(pcir.phys_hi);
  163 
  164                 /* Some OFW device trees contain dupes. */
  165                 if (pci_find_dbsf(domain, busno, slot, func) != NULL)
  166                         continue;
  167 
  168                 /*
  169                  * The preset in the intline register is usually bogus.  Reset
  170                  * it such that the PCI code will reroute the interrupt if
  171                  * needed.
  172                  */
  173 
  174                 intline = PCI_INVALID_IRQ;
  175                 if (OF_getproplen(child, "interrupts") > 0)
  176                         intline = 0;
  177                 PCIB_WRITE_CONFIG(pcib, busno, slot, func, PCIR_INTLINE,
  178                     intline, 1);
  179 
  180                 /*
  181                  * Now set up the PCI and OFW bus layer devinfo and add it
  182                  * to the PCI bus.
  183                  */
  184 
  185                 dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(pcib,
  186                     domain, busno, slot, func, sizeof(*dinfo));
  187                 if (dinfo == NULL)
  188                         continue;
  189                 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
  190                     0) {
  191                         pci_freecfg((struct pci_devinfo *)dinfo);
  192                         continue;
  193                 }
  194                 pci_add_child(dev, (struct pci_devinfo *)dinfo);
  195 
  196                 /*
  197                  * Some devices don't have an intpin set, but do have
  198                  * interrupts. These are fully specified, and set in the
  199                  * interrupts property, so add that value to the device's
  200                  * resource list.
  201                  */
  202                 if (dinfo->opd_dinfo.cfg.intpin == 0) {
  203                         ofw_pci_intr_t intr[2];
  204                         phandle_t iparent;
  205                         int icells;
  206 
  207                         if (OF_getprop(child, "interrupts", &intr, 
  208                             sizeof(intr)) > 0) {
  209                                 iparent = 0;
  210                                 icells = 1;
  211                                 OF_getprop(child, "interrupt-parent", &iparent,
  212                                     sizeof(iparent));
  213                                 OF_getprop(iparent, "#interrupt-cells", &icells,
  214                                     sizeof(icells));
  215 
  216                                 if (iparent != 0 && icells > 1) {
  217                                         powerpc_config_intr(intr[0],
  218                                             (intr[1] & 1) ? INTR_TRIGGER_LEVEL :
  219                                             INTR_TRIGGER_EDGE,
  220                                             INTR_POLARITY_HIGH);
  221                                 }
  222                 
  223                                 resource_list_add(&dinfo->opd_dinfo.resources,
  224                                     SYS_RES_IRQ, 0, intr[0], intr[0], 1);
  225                         }
  226                 }
  227         }
  228 }
  229 
  230 /*
  231  * The following is an almost exact clone of pci_add_children(), with the
  232  * addition that it (a) will not add children that have already been added,
  233  * and (b) will set up the OFW devinfo to point to invalid values. This is
  234  * to handle non-enumerated PCI children as exist in FDT and on the second
  235  * function of the Rage 128 in my Blue & White G3.
  236  */
  237 
  238 static void
  239 ofw_pcibus_enum_bus(device_t dev, u_int domain, u_int busno)
  240 {
  241         device_t pcib;
  242         struct ofw_pcibus_devinfo *dinfo;
  243         int maxslots;
  244         int s, f, pcifunchigh;
  245         uint8_t hdrtype;
  246 
  247         pcib = device_get_parent(dev);
  248 
  249         maxslots = PCIB_MAXSLOTS(pcib);
  250         for (s = 0; s <= maxslots; s++) {
  251                 pcifunchigh = 0;
  252                 f = 0;
  253                 DELAY(1);
  254                 hdrtype = PCIB_READ_CONFIG(pcib, busno, s, f, PCIR_HDRTYPE, 1);
  255                 if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
  256                         continue;
  257                 if (hdrtype & PCIM_MFDEV)
  258                         pcifunchigh = PCI_FUNCMAX;
  259                 for (f = 0; f <= pcifunchigh; f++) {
  260                         /* Filter devices we have already added */
  261                         if (pci_find_dbsf(domain, busno, s, f) != NULL)
  262                                 continue;
  263 
  264                         dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(
  265                             pcib, domain, busno, s, f, sizeof(*dinfo));
  266                         if (dinfo != NULL) {
  267                                 dinfo->opd_obdinfo.obd_node = -1;
  268 
  269                                 dinfo->opd_obdinfo.obd_name = NULL;
  270                                 dinfo->opd_obdinfo.obd_compat = NULL;
  271                                 dinfo->opd_obdinfo.obd_type = NULL;
  272                                 dinfo->opd_obdinfo.obd_model = NULL;
  273                                 pci_add_child(dev, (struct pci_devinfo *)dinfo);
  274                         }
  275                 }
  276         }
  277 }
  278 
  279 static int
  280 ofw_pcibus_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
  281     size_t buflen)
  282 {
  283         pci_child_pnpinfo_str_method(cbdev, child, buf, buflen);
  284 
  285         if (ofw_bus_get_node(child) != -1)  {
  286                 strlcat(buf, " ", buflen); /* Separate info */
  287                 ofw_bus_gen_child_pnpinfo_str(cbdev, child, buf, buflen);
  288         }
  289 
  290         return (0);
  291 }
  292         
  293 static int
  294 ofw_pcibus_assign_interrupt(device_t dev, device_t child)
  295 {
  296         ofw_pci_intr_t intr;
  297         phandle_t node;
  298         int isz;
  299 
  300         node = ofw_bus_get_node(child);
  301 
  302         if (node == -1) {
  303                 /* Non-firmware enumerated child, use standard routing */
  304         
  305                 /*
  306                  * XXX: Right now we don't have anything sensible to do here,
  307                  * since the ofw_imap stuff relies on nodes have a reg
  308                  * property. There exists ways around this, so the ePAPR
  309                  * spec will need to be studied.
  310                  */
  311 
  312                 return (0);
  313 
  314 #ifdef NOTYET
  315                 intr = pci_get_intpin(child);
  316                 return (PCIB_ROUTE_INTERRUPT(device_get_parent(dev), child, 
  317                     intr));
  318 #endif
  319         }
  320         
  321         /*
  322          * Any AAPL,interrupts property gets priority and is
  323          * fully specified (i.e. does not need routing)
  324          */
  325 
  326         isz = OF_getprop(node, "AAPL,interrupts", &intr, sizeof(intr));
  327         if (isz == sizeof(intr)) {
  328                 return (intr);
  329         }
  330 
  331         isz = OF_getprop(node, "interrupts", &intr, sizeof(intr));
  332         if (isz != sizeof(intr)) {
  333                 /* No property; our best guess is the intpin. */
  334                 intr = pci_get_intpin(child);
  335         }
  336         
  337         /*
  338          * If we got intr from a property, it may or may not be an intpin.
  339          * For on-board devices, it frequently is not, and is completely out
  340          * of the valid intpin range.  For PCI slots, it hopefully is,
  341          * otherwise we will have trouble interfacing with non-OFW buses
  342          * such as cardbus.
  343          * Since we cannot tell which it is without violating layering, we
  344          * will always use the route_interrupt method, and treat exceptions
  345          * on the level they become apparent.
  346          */
  347         return (PCIB_ROUTE_INTERRUPT(device_get_parent(dev), child, intr));
  348 }
  349 
  350 static const struct ofw_bus_devinfo *
  351 ofw_pcibus_get_devinfo(device_t bus, device_t dev)
  352 {
  353         struct ofw_pcibus_devinfo *dinfo;
  354 
  355         dinfo = device_get_ivars(dev);
  356         return (&dinfo->opd_obdinfo);
  357 }
  358
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/ofw/ofw_pcibus.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/ofw/ofw_pcibus.c
