lib/generic.c

   1 /*
   2  *      The PCI Library -- Generic Direct Access Functions
   3  *
   4  *      Copyright (c) 1997--2000 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <string.h>
  10
  11 #include "internal.h"
  12
  13 void
  14 pci_generic_scan_bus(struct pci_access *a, byte *busmap, int bus)
  15 {
  16   int dev, multi, ht;
  17   struct pci_dev *t;
  18
  19   a->debug("Scanning bus %02x for devices...\n", bus);
  20   if (busmap[bus])
  21     {
  22       a->warning("Bus %02x seen twice (firmware bug). Ignored.", bus);
  23       return;
  24     }
  25   busmap[bus] = 1;
  26   t = pci_alloc_dev(a);
  27   t->bus = bus;
  28   for(dev=0; dev<32; dev++)
  29     {
  30       t->dev = dev;
  31       multi = 0;
  32       for(t->func=0; !t->func || multi && t->func<8; t->func++)
  33         {
  34           u32 vd = pci_read_long(t, PCI_VENDOR_ID);
  35           struct pci_dev *d;
  36
  37           if (!vd || vd == 0xffffffff)
  38             continue;
  39           ht = pci_read_byte(t, PCI_HEADER_TYPE);
  40           if (!t->func)
  41             multi = ht & 0x80;
  42           ht &= 0x7f;
  43           d = pci_alloc_dev(a);
  44           d->bus = t->bus;
  45           d->dev = t->dev;
  46           d->func = t->func;
  47           d->vendor_id = vd & 0xffff;
  48           d->device_id = vd >> 16U;
  49           d->known_fields = PCI_FILL_IDENT;
  50           d->hdrtype = ht;
  51           pci_link_dev(a, d);
  52           switch (ht)
  53             {
  54             case PCI_HEADER_TYPE_NORMAL:
  55               break;
  56             case PCI_HEADER_TYPE_BRIDGE:
  57             case PCI_HEADER_TYPE_CARDBUS:
  58               pci_generic_scan_bus(a, busmap, pci_read_byte(t, PCI_SECONDARY_BUS));
  59               break;
  60             default:
  61               a->debug("Device %02x:%02x.%d has unknown header type %02x.\n", d->bus, d->dev, d->func, ht);
  62             }
  63         }
  64     }
  65   pci_free_dev(t);
  66 }
  67
  68 void
  69 pci_generic_scan(struct pci_access *a)
  70 {
  71   byte busmap[256];
  72
  73   bzero(busmap, sizeof(busmap));
  74   pci_generic_scan_bus(a, busmap, 0);
  75 }
  76
  77 int
  78 pci_generic_fill_info(struct pci_dev *d, int flags)
  79 {
  80   struct pci_access *a = d->access;
  81
  82   if (flags & PCI_FILL_IDENT)
  83     {
  84       d->vendor_id = pci_read_word(d, PCI_VENDOR_ID);
  85       d->device_id = pci_read_word(d, PCI_DEVICE_ID);
  86     }
  87   if (flags & PCI_FILL_IRQ)
  88     d->irq = pci_read_byte(d, PCI_INTERRUPT_LINE);
  89   if (flags & PCI_FILL_BASES)
  90     {
  91       int cnt = 0, i;
  92       bzero(d->base_addr, sizeof(d->base_addr));
  93       switch (d->hdrtype)
  94         {
  95         case PCI_HEADER_TYPE_NORMAL:
  96           cnt = 6;
  97           break;
  98         case PCI_HEADER_TYPE_BRIDGE:
  99           cnt = 2;
 100           break;
 101         case PCI_HEADER_TYPE_CARDBUS:
 102           cnt = 1;
 103           break;
 104         }
 105       if (cnt)
 106         {
 107           u16 cmd = pci_read_word(d, PCI_COMMAND);
 108           for(i=0; i<cnt; i++)
 109             {
 110               u32 x = pci_read_long(d, PCI_BASE_ADDRESS_0 + i*4);
 111               if (!x || x == (u32) ~0)
 112                 continue;
 113               d->base_addr[i] = x;
 114               if (x & PCI_BASE_ADDRESS_SPACE_IO)
 115                 {
 116                   if (!a->buscentric && !(cmd & PCI_COMMAND_IO))
 117                     d->base_addr[i] = 0;
 118                 }
 119               else if (a->buscentric || (cmd & PCI_COMMAND_MEMORY))
 120                 {
 121                   if ((x & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64)
 122                     {
 123                       if (i >= cnt-1)
 124                         a->warning("%02x:%02x.%d: Invalid 64-bit address seen.", d->bus, d->dev, d->func);
 125                       else
 126                         {
 127                           u32 y = pci_read_long(d, PCI_BASE_ADDRESS_0 + (++i)*4);
 128 #ifdef HAVE_64BIT_ADDRESS
 129                           d->base_addr[i-1] |= ((pciaddr_t) y) << 32;
 130 #else
 131                           if (y)
 132                             {
 133                               a->warning("%02x:%02x.%d 64-bit device address ignored.", d->bus, d->dev, d->func);
 134                               d->base_addr[i-1] = 0;
 135                             }
 136 #endif
 137                         }
 138                     }
 139                 }
 140               else
 141                 d->base_addr[i] = 0;
 142             }
 143         }
 144     }
 145   if (flags & PCI_FILL_ROM_BASE)
 146     {
 147       int reg = 0;
 148       d->rom_base_addr = 0;
 149       switch (d->hdrtype)
 150         {
 151         case PCI_HEADER_TYPE_NORMAL:
 152           reg = PCI_ROM_ADDRESS;
 153           break;
 154         case PCI_HEADER_TYPE_BRIDGE:
 155           reg = PCI_ROM_ADDRESS1;
 156           break;
 157         }
 158       if (reg)
 159         {
 160           u32 a = pci_read_long(d, reg);
 161           if (a & PCI_ROM_ADDRESS_ENABLE)
 162             d->rom_base_addr = a;
 163         }
 164     }
 165   return flags & ~PCI_FILL_SIZES;
 166 }
 167
 168 static int
 169 pci_generic_block_op(struct pci_dev *d, int pos, byte *buf, int len,
 170                  int (*r)(struct pci_dev *d, int pos, byte *buf, int len))
 171 {
 172   if ((pos & 1) && len >= 1)
 173     {
 174       if (!r(d, pos, buf, 1))
 175         return 0;
 176       pos++; buf++; len--;
 177     }
 178   if ((pos & 3) && len >= 2)
 179     {
 180       if (!r(d, pos, buf, 2))
 181         return 0;
 182       pos += 2; buf += 2; len -= 2;
 183     }
 184   while (len >= 4)
 185     {
 186       if (!r(d, pos, buf, 4))
 187         return 0;
 188       pos += 4; buf += 4; len -= 4;
 189     }
 190   if (len >= 2)
 191     {
 192       if (!r(d, pos, buf, 2))
 193         return 0;
 194       pos += 2; buf += 2; len -= 2;
 195     }
 196   if (len && !r(d, pos, buf, 1))
 197     return 0;
 198   return 1;
 199 }
 200
 201 int
 202 pci_generic_block_read(struct pci_dev *d, int pos, byte *buf, int len)
 203 {
 204   return pci_generic_block_op(d, pos, buf, len, d->access->methods->read);
 205 }
 206
 207 int
 208 pci_generic_block_write(struct pci_dev *d, int pos, byte *buf, int len)
 209 {
 210   return pci_generic_block_op(d, pos, buf, len, d->access->methods->write);
 211 }