grackle.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright 2003 by Peter Grehan. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/conf.h>
   38 #include <sys/kernel.h>
   39 #include <sys/proc.h>
   40 #include <sys/rman.h>
   41 
   42 #include <dev/ofw/openfirm.h>
   43 #include <dev/ofw/ofw_pci.h>
   44 #include <dev/ofw/ofw_bus.h>
   45 #include <dev/ofw/ofw_bus_subr.h>
   46 #include <dev/ofw/ofwpci.h>
   47 
   48 #include <dev/pci/pcivar.h>
   49 #include <dev/pci/pcireg.h>
   50 
   51 #include <machine/bus.h>
   52 #include <machine/intr_machdep.h>
   53 #include <machine/md_var.h>
   54 #include <machine/pio.h>
   55 #include <machine/resource.h>
   56 
   57 #include <powerpc/powermac/gracklevar.h>
   58 
   59 #include <vm/vm.h>
   60 #include <vm/pmap.h>
   61 
   62 #include "pcib_if.h"
   63 
   64 /*
   65  * Device interface.
   66  */
   67 static int              grackle_probe(device_t);
   68 static int              grackle_attach(device_t);
   69 
   70 /*
   71  * pcib interface.
   72  */
   73 static u_int32_t        grackle_read_config(device_t, u_int, u_int, u_int,
   74                             u_int, int);
   75 static void             grackle_write_config(device_t, u_int, u_int, u_int,
   76                             u_int, u_int32_t, int);
   77 
   78 /*
   79  * Local routines.
   80  */
   81 static int              grackle_enable_config(struct grackle_softc *, u_int,
   82                             u_int, u_int, u_int);
   83 static void             grackle_disable_config(struct grackle_softc *);
   84 static int              badaddr(void *, size_t);
   85 
   86 /*
   87  * Driver methods.
   88  */
   89 static device_method_t  grackle_methods[] = {
   90         /* Device interface */
   91         DEVMETHOD(device_probe,         grackle_probe),
   92         DEVMETHOD(device_attach,        grackle_attach),
   93 
   94         /* pcib interface */
   95         DEVMETHOD(pcib_read_config,     grackle_read_config),
   96         DEVMETHOD(pcib_write_config,    grackle_write_config),
   97 
   98         DEVMETHOD_END
   99 };
  100 
  101 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
  102     sizeof(struct grackle_softc), ofw_pcib_driver);
  103 DRIVER_MODULE(grackle, ofwbus, grackle_driver, 0, 0);
  104 
  105 static int
  106 grackle_probe(device_t dev)
  107 {
  108         const char      *type, *compatible;
  109 
  110         type = ofw_bus_get_type(dev);
  111         compatible = ofw_bus_get_compat(dev);
  112 
  113         if (type == NULL || compatible == NULL)
  114                 return (ENXIO);
  115 
  116         if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
  117                 return (ENXIO);
  118 
  119         device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
  120         return (0);
  121 }
  122 
  123 static int
  124 grackle_attach(device_t dev)
  125 {
  126         struct          grackle_softc *sc;
  127 
  128         sc = device_get_softc(dev);
  129 
  130         /*
  131          * The Grackle PCI config addr/data registers are actually in
  132          * PCI space, but since they are needed to actually probe the
  133          * PCI bus, use the fact that they are also available directly
  134          * on the processor bus and map them
  135          */
  136         sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
  137         sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
  138 
  139         return (ofw_pcib_attach(dev));
  140 }
  141 
  142 static u_int32_t
  143 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
  144     int width)
  145 {
  146         struct          grackle_softc *sc;
  147         vm_offset_t     caoff;
  148         u_int32_t       retval = 0xffffffff;
  149 
  150         sc = device_get_softc(dev);
  151         caoff = sc->sc_data + (reg & 0x03);
  152 
  153         if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
  154                 /*
  155                  * Config probes to non-existent devices on the
  156                  * secondary bus generates machine checks. Be sure
  157                  * to catch these.
  158                  */
  159                 if (bus > 0) {
  160                   if (badaddr((void *)sc->sc_data, 4)) {
  161                           return (retval);
  162                   }
  163                 }
  164 
  165                 switch (width) {
  166                 case 1:
  167                         retval = (in8rb(caoff));
  168                         break;
  169                 case 2:
  170                         retval = (in16rb(caoff));
  171                         break;
  172                 case 4:
  173                         retval = (in32rb(caoff));
  174                         break;
  175                 }
  176         }
  177         grackle_disable_config(sc);
  178 
  179         return (retval);
  180 }
  181 
  182 static void
  183 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
  184     u_int reg, u_int32_t val, int width)
  185 {
  186         struct          grackle_softc *sc;
  187         vm_offset_t     caoff;
  188 
  189         sc = device_get_softc(dev);
  190         caoff = sc->sc_data + (reg & 0x03);
  191 
  192         if (grackle_enable_config(sc, bus, slot, func, reg)) {
  193                 switch (width) {
  194                 case 1:
  195                         out8rb(caoff, val);
  196                         (void)in8rb(caoff);
  197                         break;
  198                 case 2:
  199                         out16rb(caoff, val);
  200                         (void)in16rb(caoff);
  201                         break;
  202                 case 4:
  203                         out32rb(caoff, val);
  204                         (void)in32rb(caoff);
  205                         break;
  206                 }
  207         }
  208         grackle_disable_config(sc);
  209 }
  210 
  211 static int
  212 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
  213     u_int func, u_int reg)
  214 {
  215         u_int32_t       cfgval;
  216 
  217         /*
  218          * Unlike UniNorth, the format of the config word is the same
  219          * for local (0) and remote busses.
  220          */
  221         cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
  222             | GRACKLE_CFG_ENABLE;
  223 
  224         out32rb(sc->sc_addr, cfgval);
  225         (void) in32rb(sc->sc_addr);
  226 
  227         return (1);
  228 }
  229 
  230 static void
  231 grackle_disable_config(struct grackle_softc *sc)
  232 {
  233         /*
  234          * Clear the GRACKLE_CFG_ENABLE bit to prevent stray
  235          * accesses from causing config cycles
  236          */
  237         out32rb(sc->sc_addr, 0);
  238 }
  239 
  240 static int
  241 badaddr(void *addr, size_t size)
  242 {
  243         struct thread   *td;
  244         jmp_buf         env, *oldfaultbuf;
  245 
  246         /* Get rid of any stale machine checks that have been waiting.  */
  247         __asm __volatile ("sync; isync");
  248 
  249         td = curthread;
  250 
  251         oldfaultbuf = td->td_pcb->pcb_onfault;
  252         td->td_pcb->pcb_onfault = &env;
  253         if (setjmp(env)) {
  254                 td->td_pcb->pcb_onfault = oldfaultbuf;
  255                 __asm __volatile ("sync");
  256                 return 1;
  257         }
  258 
  259         __asm __volatile ("sync");
  260 
  261         switch (size) {
  262         case 1:
  263                 (void)*(volatile int8_t *)addr;
  264                 break;
  265         case 2:
  266                 (void)*(volatile int16_t *)addr;
  267                 break;
  268         case 4:
  269                 (void)*(volatile int32_t *)addr;
  270                 break;
  271         default:
  272                 panic("badaddr: invalid size (%zd)", size);
  273         }
  274 
  275         /* Make sure we took the machine check, if we caused one. */
  276         __asm __volatile ("sync; isync");
  277 
  278         td->td_pcb->pcb_onfault = oldfaultbuf;
  279         __asm __volatile ("sync");      /* To be sure. */
  280 
  281         return (0);
  282 }
  283 
  284 /*
  285  * Driver to swallow Grackle host bridges from the PCI bus side.
  286  */
  287 static int
  288 grackle_hb_probe(device_t dev)
  289 {
  290 
  291         if (pci_get_devid(dev) == 0x00021057) {
  292                 device_set_desc(dev, "Grackle Host to PCI bridge");
  293                 device_quiet(dev);
  294                 return (0);
  295         }
  296 
  297         return (ENXIO);
  298 }
  299 
  300 static int
  301 grackle_hb_attach(device_t dev)
  302 {
  303 
  304         return (0);
  305 }
  306 
  307 static device_method_t grackle_hb_methods[] = {
  308         /* Device interface */
  309         DEVMETHOD(device_probe,         grackle_hb_probe),
  310         DEVMETHOD(device_attach,        grackle_hb_attach),
  311         { 0, 0 }
  312 };
  313 
  314 static driver_t grackle_hb_driver = {
  315         "grackle_hb",
  316         grackle_hb_methods,
  317         1,
  318 };
  319 
  320 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, 0, 0);
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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powermac/grackle.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powermac/grackle.c
