pci_map.c

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    1 /*      $NetBSD: pci_map.c,v 1.12 2002/05/30 12:06:43 drochner Exp $    */
    2 
    3 /*-
    4  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Charles M. Hannum; by William R. Studenmund; by Jason R. Thorpe.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * PCI device mapping.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __KERNEL_RCSID(0, "$NetBSD: pci_map.c,v 1.12 2002/05/30 12:06:43 drochner Exp $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/device.h>
   49 
   50 #include <dev/pci/pcireg.h>
   51 #include <dev/pci/pcivar.h>
   52 
   53 static int
   54 pci_io_find(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type,
   55     bus_addr_t *basep, bus_size_t *sizep, int *flagsp)
   56 {
   57         pcireg_t address, mask;
   58         int s;
   59 
   60         if (reg < PCI_MAPREG_START ||
   61 #if 0
   62             /*
   63              * Can't do this check; some devices have mapping registers
   64              * way out in left field.
   65              */
   66             reg >= PCI_MAPREG_END ||
   67 #endif
   68             (reg & 3))
   69                 panic("pci_io_find: bad request");
   70 
   71         /*
   72          * Section 6.2.5.1, `Address Maps', tells us that:
   73          *
   74          * 1) The builtin software should have already mapped the device in a
   75          * reasonable way.
   76          *
   77          * 2) A device which wants 2^n bytes of memory will hardwire the bottom
   78          * n bits of the address to 0.  As recommended, we write all 1s and see
   79          * what we get back.
   80          */
   81         s = splhigh();
   82         address = pci_conf_read(pc, tag, reg);
   83         pci_conf_write(pc, tag, reg, 0xffffffff);
   84         mask = pci_conf_read(pc, tag, reg);
   85         pci_conf_write(pc, tag, reg, address);
   86         splx(s);
   87 
   88         if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_IO) {
   89                 printf("pci_io_find: expected type i/o, found mem\n");
   90                 return (1);
   91         }
   92 
   93         if (PCI_MAPREG_IO_SIZE(mask) == 0) {
   94                 printf("pci_io_find: void region\n");
   95                 return (1);
   96         }
   97 
   98         if (basep != 0)
   99                 *basep = PCI_MAPREG_IO_ADDR(address);
  100         if (sizep != 0)
  101                 *sizep = PCI_MAPREG_IO_SIZE(mask);
  102         if (flagsp != 0)
  103                 *flagsp = 0;
  104 
  105         return (0);
  106 }
  107 
  108 static int
  109 pci_mem_find(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type,
  110     bus_addr_t *basep, bus_size_t *sizep, int *flagsp)
  111 {
  112         pcireg_t address, mask, address1 = 0, mask1 = 0xffffffff;
  113         u_int64_t waddress, wmask;
  114         int s, is64bit;
  115 
  116         is64bit = (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT);
  117 
  118         if (reg < PCI_MAPREG_START ||
  119 #if 0
  120             /*
  121              * Can't do this check; some devices have mapping registers
  122              * way out in left field.
  123              */
  124             reg >= PCI_MAPREG_END ||
  125 #endif
  126             (reg & 3))
  127                 panic("pci_mem_find: bad request");
  128 
  129         if (is64bit && (reg + 4) >= PCI_MAPREG_END)
  130                 panic("pci_mem_find: bad 64-bit request");
  131 
  132         /*
  133          * Section 6.2.5.1, `Address Maps', tells us that:
  134          *
  135          * 1) The builtin software should have already mapped the device in a
  136          * reasonable way.
  137          *
  138          * 2) A device which wants 2^n bytes of memory will hardwire the bottom
  139          * n bits of the address to 0.  As recommended, we write all 1s and see
  140          * what we get back.
  141          */
  142         s = splhigh();
  143         address = pci_conf_read(pc, tag, reg);
  144         pci_conf_write(pc, tag, reg, 0xffffffff);
  145         mask = pci_conf_read(pc, tag, reg);
  146         pci_conf_write(pc, tag, reg, address);
  147         if (is64bit) {
  148                 address1 = pci_conf_read(pc, tag, reg + 4);
  149                 pci_conf_write(pc, tag, reg + 4, 0xffffffff);
  150                 mask1 = pci_conf_read(pc, tag, reg + 4);
  151                 pci_conf_write(pc, tag, reg + 4, address1);
  152         }
  153         splx(s);
  154 
  155         if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) {
  156                 printf("pci_mem_find: expected type mem, found i/o\n");
  157                 return (1);
  158         }
  159         if (PCI_MAPREG_MEM_TYPE(address) != PCI_MAPREG_MEM_TYPE(type)) {
  160                 printf("pci_mem_find: expected mem type %08x, found %08x\n",
  161                     PCI_MAPREG_MEM_TYPE(type),
  162                     PCI_MAPREG_MEM_TYPE(address));
  163                 return (1);
  164         }
  165 
  166         waddress = (u_int64_t)address1 << 32UL | address;
  167         wmask = (u_int64_t)mask1 << 32UL | mask;
  168 
  169         if ((is64bit && PCI_MAPREG_MEM64_SIZE(wmask) == 0) ||
  170             (!is64bit && PCI_MAPREG_MEM_SIZE(mask) == 0)) {
  171                 printf("pci_mem_find: void region\n");
  172                 return (1);
  173         }
  174 
  175         switch (PCI_MAPREG_MEM_TYPE(address)) {
  176         case PCI_MAPREG_MEM_TYPE_32BIT:
  177         case PCI_MAPREG_MEM_TYPE_32BIT_1M:
  178                 break;
  179         case PCI_MAPREG_MEM_TYPE_64BIT:
  180                 /*
  181                  * Handle the case of a 64-bit memory register on a
  182                  * platform with 32-bit addressing.  Make sure that
  183                  * the address assigned and the device's memory size
  184                  * fit in 32 bits.  We implicitly assume that if
  185                  * bus_addr_t is 64-bit, then so is bus_size_t.
  186                  */
  187                 if (sizeof(u_int64_t) > sizeof(bus_addr_t) &&
  188                     (address1 != 0 || mask1 != 0xffffffff)) {
  189                         printf("pci_mem_find: 64-bit memory map which is "
  190                             "inaccessible on a 32-bit platform\n");
  191                         return (1);
  192                 }
  193                 break;
  194         default:
  195                 printf("pci_mem_find: reserved mapping register type\n");
  196                 return (1);
  197         }
  198 
  199         if (sizeof(u_int64_t) > sizeof(bus_addr_t)) {
  200                 if (basep != 0)
  201                         *basep = PCI_MAPREG_MEM_ADDR(address);
  202                 if (sizep != 0)
  203                         *sizep = PCI_MAPREG_MEM_SIZE(mask);
  204         } else {
  205                 if (basep != 0)
  206                         *basep = PCI_MAPREG_MEM64_ADDR(waddress);
  207                 if (sizep != 0)
  208                         *sizep = PCI_MAPREG_MEM64_SIZE(wmask);
  209         }
  210         if (flagsp != 0)
  211                 *flagsp = PCI_MAPREG_MEM_PREFETCHABLE(address) ?
  212                     BUS_SPACE_MAP_PREFETCHABLE : 0;
  213 
  214         return (0);
  215 }
  216 
  217 #define _PCI_MAPREG_TYPEBITS(reg) \
  218         (PCI_MAPREG_TYPE(reg) == PCI_MAPREG_TYPE_IO ? \
  219         reg & PCI_MAPREG_TYPE_MASK : \
  220         reg & (PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK))
  221 
  222 pcireg_t
  223 pci_mapreg_type(pci_chipset_tag_t pc, pcitag_t tag, int reg)
  224 {
  225 
  226         return (_PCI_MAPREG_TYPEBITS(pci_conf_read(pc, tag, reg)));
  227 }
  228 
  229 int
  230 pci_mapreg_probe(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *typep)
  231 {
  232         pcireg_t address, mask;
  233         int s;
  234         
  235         s = splhigh();
  236         address = pci_conf_read(pc, tag, reg);
  237         pci_conf_write(pc, tag, reg, 0xffffffff);
  238         mask = pci_conf_read(pc, tag, reg);
  239         pci_conf_write(pc, tag, reg, address);
  240         splx(s);
  241 
  242         if (mask == 0) /* unimplemented mapping register */
  243                 return (0);
  244 
  245         if (typep)
  246                 *typep = _PCI_MAPREG_TYPEBITS(address);
  247         return (1);
  248 }
  249 
  250 int
  251 pci_mapreg_info(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type,
  252     bus_addr_t *basep, bus_size_t *sizep, int *flagsp)
  253 {
  254 
  255         if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO)
  256                 return (pci_io_find(pc, tag, reg, type, basep, sizep,
  257                     flagsp));
  258         else
  259                 return (pci_mem_find(pc, tag, reg, type, basep, sizep,
  260                     flagsp));
  261 }
  262 
  263 int
  264 pci_mapreg_map(struct pci_attach_args *pa, int reg, pcireg_t type,
  265     int busflags, bus_space_tag_t *tagp, bus_space_handle_t *handlep,
  266     bus_addr_t *basep, bus_size_t *sizep)
  267 {
  268         bus_space_tag_t tag;
  269         bus_space_handle_t handle;
  270         bus_addr_t base;
  271         bus_size_t size;
  272         int flags;
  273 
  274         if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) {
  275                 if ((pa->pa_flags & PCI_FLAGS_IO_ENABLED) == 0)
  276                         return (1);
  277                 if (pci_io_find(pa->pa_pc, pa->pa_tag, reg, type, &base,
  278                     &size, &flags))
  279                         return (1);
  280                 tag = pa->pa_iot;
  281         } else {
  282                 if ((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) == 0)
  283                         return (1);
  284                 if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg, type, &base,
  285                     &size, &flags))
  286                         return (1);
  287                 tag = pa->pa_memt;
  288         }
  289 
  290         if (bus_space_map(tag, base, size, busflags | flags, &handle))
  291                 return (1);
  292 
  293         if (tagp != 0)
  294                 *tagp = tag;
  295         if (handlep != 0)
  296                 *handlep = handle;
  297         if (basep != 0)
  298                 *basep = base;
  299         if (sizep != 0)
  300                 *sizep = size;
  301 
  302         return (0);
  303 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/pci/pci_map.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/pci_map.c
