sys/arch/prep/pci/pci_machdep.c

   1 /*      $NetBSD: pci_machdep.c,v 1.31.4.4 2007/05/10 15:46:08 garbled Exp $     */
   2
   3 /*
   4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
   5  * Copyright (c) 1994 Charles M. Hannum.  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  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Charles M. Hannum.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Machine-specific functions for PCI autoconfiguration.
  35  *
  36  * On PCs, there are two methods of generating PCI configuration cycles.
  37  * We try to detect the appropriate mechanism for this machine and set
  38  * up a few function pointers to access the correct method directly.
  39  */
  40
  41 #include <sys/cdefs.h>
  42 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.31.4.4 2007/05/10 15:46:08 garbled Exp $");
  43
  44 #include <sys/types.h>
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/systm.h>
  48 #include <sys/errno.h>
  49 #include <sys/extent.h>
  50 #include <sys/device.h>
  51 #include <sys/malloc.h>
  52
  53 #include <uvm/uvm_extern.h>
  54
  55 #define _POWERPC_BUS_DMA_PRIVATE
  56 #include <machine/bus.h>
  57 #include <machine/intr.h>
  58 #include <machine/platform.h>
  59 #include <machine/pnp.h>
  60
  61 #include <dev/isa/isavar.h>
  62
  63 #include <dev/pci/pcivar.h>
  64 #include <dev/pci/pcireg.h>
  65 #include <dev/pci/pcidevs.h>
  66 #include <dev/pci/pciconf.h>
  67
  68 /* 0 == direct 1 == indirect */
  69 int prep_pci_config_mode = 1;
  70 extern struct genppc_pci_chipset *genppc_pct;
  71 extern u_int32_t prep_pci_baseaddr;
  72 extern u_int32_t prep_pci_basedata;
  73
  74 static void
  75 prep_pci_get_chipset_tag_indirect(pci_chipset_tag_t pc)
  76 {
  77
  78         pc->pc_conf_v = (void *)pc;
  79
  80         pc->pc_attach_hook = genppc_pci_indirect_attach_hook;
  81         pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
  82         pc->pc_make_tag = genppc_pci_indirect_make_tag;
  83         pc->pc_conf_read = genppc_pci_indirect_conf_read;
  84         pc->pc_conf_write = genppc_pci_indirect_conf_write;
  85
  86         pc->pc_intr_v = (void *)pc;
  87
  88         pc->pc_intr_map = prep_pci_intr_map;
  89         pc->pc_intr_string = genppc_pci_intr_string;
  90         pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
  91         pc->pc_intr_establish = genppc_pci_intr_establish;
  92         pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
  93
  94         pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
  95         pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag;
  96         pc->pc_conf_hook = prep_pci_conf_hook;
  97
  98         pc->pc_addr = mapiodev(prep_pci_baseaddr, 4);
  99         pc->pc_data = mapiodev(prep_pci_basedata, 4);
 100         pc->pc_bus = 0;
 101         pc->pc_node = 0;
 102         pc->pc_memt = 0;
 103         pc->pc_iot = 0;
 104 }
 105
 106 void
 107 prep_pci_get_chipset_tag(pci_chipset_tag_t pc)
 108 {
 109         int i;
 110
 111         i = pci_chipset_tag_type();
 112
 113         if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) {
 114                 prep_pci_config_mode = 1;
 115                 prep_pci_get_chipset_tag_indirect(pc);
 116         } else if (i == PCIBridgeDirect) {
 117                 prep_pci_get_chipset_tag_direct(pc);
 118                 prep_pci_config_mode = 0;
 119         } else
 120                 panic("Unknown PCI chipset tag configuration method");
 121 }
 122
 123 int
 124 prep_pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
 125 {
 126         struct genppc_pci_chipset_businfo *pbi;
 127         prop_object_t busmax;
 128
 129         pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
 130         while (busno--)
 131                 pbi = SIMPLEQ_NEXT(pbi, next);
 132         if (pbi == NULL)
 133                 return 32;
 134
 135         busmax = prop_dictionary_get(pbi->pbi_properties,
 136             "prep-pcibus-maxdevices");
 137         if (busmax == NULL)
 138                 return 32;
 139         else
 140                 return prop_number_integer_value(busmax);
 141
 142         return 32;
 143 }
 144
 145 int
 146 prep_pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
 147 {
 148         struct genppc_pci_chipset_businfo *pbi;
 149         prop_dictionary_t dict, devsub;
 150         prop_object_t pinsub;
 151         prop_number_t pbus;
 152         int busno, bus, pin, line, swiz, dev, origdev, i;
 153         char key[20];
 154
 155         pin = pa->pa_intrpin;
 156         line = pa->pa_intrline;
 157         bus = busno = pa->pa_bus;
 158         swiz = pa->pa_intrswiz;
 159         origdev = dev = pa->pa_device;
 160         i = 0;
 161
 162         pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
 163         while (busno--)
 164                 pbi = SIMPLEQ_NEXT(pbi, next);
 165         KASSERT(pbi != NULL);
 166
 167         dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap");
 168
 169         if (dict != NULL)
 170                 i = prop_dictionary_count(dict);
 171
 172         if (dict == NULL || i == 0) {
 173                 /* We have a non-PReP bus.  now it gets hard */
 174                 pbus = prop_dictionary_get(pbi->pbi_properties,
 175                     "prep-pcibus-parent");
 176                 if (pbus == NULL)
 177                         goto bad;
 178                 busno = prop_number_integer_value(pbus);
 179                 pbus = prop_dictionary_get(pbi->pbi_properties,
 180                     "prep-pcibus-rawdevnum");
 181                 dev = prop_number_integer_value(pbus);
 182
 183                 /* now that we know the parent bus, we need to find it's pbi */
 184                 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
 185                 while (busno--)
 186                         pbi = SIMPLEQ_NEXT(pbi, next);
 187                 KASSERT(pbi != NULL);
 188
 189                 /* swizzle the pin */
 190                 pin = ((pin + origdev - 1) & 3) + 1;
 191
 192                 /* now we have the pbi, ask for dict again */
 193                 dict = prop_dictionary_get(pbi->pbi_properties,
 194                     "prep-pci-intrmap");
 195                 if (dict == NULL)
 196                         goto bad;
 197         }
 198
 199         /* No IRQ used. */
 200         if (pin == 0)
 201                 goto bad;
 202         if (pin > 4) {
 203                 aprint_error("pci_intr_map: bad interrupt pin %d\n", pin);
 204                 goto bad;
 205         }
 206
 207         sprintf(key, "devfunc-%d", dev);
 208         devsub = prop_dictionary_get(dict, key);
 209         if (devsub == NULL)
 210                 goto bad;
 211         sprintf(key, "pin-%c", 'A' + (pin-1));
 212         pinsub = prop_dictionary_get(devsub, key);
 213         if (pinsub == NULL)
 214                 goto bad;
 215         line = prop_number_integer_value(pinsub);
 216
 217         /*
 218         * Section 6.2.4, `Miscellaneous Functions', says that 255 means
 219         * `unknown' or `no connection' on a PC.  We assume that a device with
 220         * `no connection' either doesn't have an interrupt (in which case the
 221         * pin number should be 0, and would have been noticed above), or
 222         * wasn't configured by the BIOS (in which case we punt, since there's
 223         * no real way we can know how the interrupt lines are mapped in the
 224         * hardware).
 225         *
 226         * XXX
 227         * Since IRQ 0 is only used by the clock, and we can't actually be sure
 228         * that the BIOS did its job, we also recognize that as meaning that
 229         * the BIOS has not configured the device.
 230         */
 231         if (line == 0 || line == 255) {
 232                 aprint_error("pci_intr_map: no mapping for pin %c\n",
 233                     '@' + pin);
 234                 goto bad;
 235         } else {
 236                 if (line >= ICU_LEN) {
 237                         aprint_error("pci_intr_map: bad interrupt line %d\n",
 238                             line);
 239                         goto bad;
 240                 }
 241                 if (line == IRQ_SLAVE) {
 242                         aprint_verbose("pci_intr_map: changed line 2 to line 9\n");
 243                         line = 9;
 244                 }
 245         }
 246
 247         *ihp = line;
 248         return 0;
 249
 250 bad:
 251         *ihp = -1;
 252         return 1;
 253 }
 254
 255 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
 256 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int);
 257 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
 258 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int);
 259
 260 int
 261 prep_pci_conf_hook(pci_chipset_tag_t pct, int bus, int dev, int func,
 262         pcireg_t id)
 263 {
 264         struct genppc_pci_chipset_businfo *pbi;
 265         prop_number_t bmax, pbus;
 266         pcitag_t tag;
 267         pcireg_t class;
 268
 269         /*
 270          * The P9100 board found in some IBM machines cannot be
 271          * over-configured.
 272          */
 273         if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK &&
 274             PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100)
 275                 return 0;
 276
 277         /* We have already mapped the MPIC2 if we have one, so leave it
 278            alone */
 279         if (PCI_VENDOR(id) == PCI_VENDOR_IBM &&
 280             PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2)
 281                 return 0;
 282
 283         if (PCI_VENDOR(id) == PCI_VENDOR_IBM &&
 284             PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC)
 285                 return 0;
 286
 287         if (PCI_VENDOR(id) == PCI_VENDOR_INTEL &&
 288             PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB)
 289                 return 0;
 290
 291         if (PCI_VENDOR(id) == PCI_VENDOR_MOT &&
 292             PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN)
 293                 return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM);
 294
 295         /* NOTE, all device specific stuff must be above this line */
 296         /* don't do this on the primary host bridge */
 297         if (bus == 0 && dev == 0 && func == 0)
 298                 return PCI_CONF_DEFAULT;
 299
 300         if (prep_pci_config_mode) {
 301                 tag = genppc_pci_indirect_make_tag(pct, bus, dev, func);
 302                 class = genppc_pci_indirect_conf_read(pct, tag,
 303                     PCI_CLASS_REG);
 304         } else {
 305                 tag = prep_pci_direct_make_tag(pct, bus, dev, func);
 306                 class = prep_pci_direct_conf_read(pct, tag,
 307                     PCI_CLASS_REG);
 308         }
 309
 310         /*
 311          * PCI bridges have special needs.  We need to discover where they
 312          * came from, and wire them appropriately.
 313          */
 314         if (PCI_CLASS(class) == PCI_CLASS_BRIDGE &&
 315             PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) {
 316                 pbi = malloc(sizeof(struct genppc_pci_chipset_businfo),
 317                     M_DEVBUF, M_NOWAIT);
 318                 KASSERT(pbi != NULL);
 319                 pbi->pbi_properties = prop_dictionary_create();
 320                 KASSERT(pbi->pbi_properties != NULL);
 321                 setup_pciintr_map(pbi, bus, dev, func);
 322
 323                 /* record the parent bus, and the parent device number */
 324                 pbus = prop_number_create_integer(bus);
 325                 prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent",
 326                     pbus);
 327                 prop_object_release(pbus);
 328                 pbus = prop_number_create_integer(dev);
 329                 prop_dictionary_set(pbi->pbi_properties,
 330                     "prep-pcibus-rawdevnum", pbus);
 331                 prop_object_release(pbus);
 332
 333                 /* now look for bus quirks */
 334
 335                 if (PCI_VENDOR(id) == PCI_VENDOR_DEC &&
 336                     PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) {
 337                         bmax = prop_number_create_integer(8);
 338                         KASSERT(bmax != NULL);
 339                         prop_dictionary_set(pbi->pbi_properties,
 340                             "prep-pcibus-maxdevices", bmax);
 341                         prop_object_release(bmax);
 342                 }
 343
 344                 SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next);
 345         }
 346
 347         return (PCI_CONF_DEFAULT);
 348 }