lib/generic.c

   1 /*
   2  *      The PCI Library -- Generic Direct Access Functions
   3  *
   4  *      Copyright (c) 1997--2022 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 %04x:%02x:%02x.%d has unknown header type %02x.\n", d->domain, 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   memset(busmap, 0, sizeof(busmap));
  74   pci_generic_scan_bus(a, busmap, 0);
  75 }
  76
  77 static int
  78 get_hdr_type(struct pci_dev *d)
  79 {
  80   if (d->hdrtype < 0)
  81     d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f;
  82   return d->hdrtype;
  83 }
  84
  85 void
  86 pci_generic_fill_info(struct pci_dev *d, unsigned int flags)
  87 {
  88   struct pci_access *a = d->access;
  89
  90   if (want_fill(d, flags, PCI_FILL_IDENT))
  91     {
  92       d->vendor_id = pci_read_word(d, PCI_VENDOR_ID);
  93       d->device_id = pci_read_word(d, PCI_DEVICE_ID);
  94     }
  95
  96   if (want_fill(d, flags, PCI_FILL_CLASS))
  97     d->device_class = pci_read_word(d, PCI_CLASS_DEVICE);
  98
  99   if (want_fill(d, flags, PCI_FILL_CLASS_EXT))
 100     {
 101       d->prog_if = pci_read_byte(d, PCI_CLASS_PROG);
 102       d->rev_id = pci_read_byte(d, PCI_REVISION_ID);
 103     }
 104
 105   if (want_fill(d, flags, PCI_FILL_SUBSYS))
 106     {
 107       switch (get_hdr_type(d))
 108         {
 109         case PCI_HEADER_TYPE_NORMAL:
 110           d->subsys_vendor_id = pci_read_word(d, PCI_SUBSYSTEM_VENDOR_ID);
 111           d->subsys_id = pci_read_word(d, PCI_SUBSYSTEM_ID);
 112           break;
 113         case PCI_HEADER_TYPE_CARDBUS:
 114           d->subsys_vendor_id = pci_read_word(d, PCI_CB_SUBSYSTEM_VENDOR_ID);
 115           d->subsys_id = pci_read_word(d, PCI_CB_SUBSYSTEM_ID);
 116           break;
 117         default:
 118           clear_fill(d, PCI_FILL_SUBSYS);
 119         }
 120     }
 121
 122   if (want_fill(d, flags, PCI_FILL_IRQ))
 123     d->irq = pci_read_byte(d, PCI_INTERRUPT_LINE);
 124
 125   if (want_fill(d, flags, PCI_FILL_BASES))
 126     {
 127       int cnt = 0, i;
 128       memset(d->base_addr, 0, sizeof(d->base_addr));
 129       switch (get_hdr_type(d))
 130         {
 131         case PCI_HEADER_TYPE_NORMAL:
 132           cnt = 6;
 133           break;
 134         case PCI_HEADER_TYPE_BRIDGE:
 135           cnt = 2;
 136           break;
 137         case PCI_HEADER_TYPE_CARDBUS:
 138           cnt = 1;
 139           break;
 140         }
 141       if (cnt)
 142         {
 143           for (i=0; i<cnt; i++)
 144             {
 145               u32 x = pci_read_long(d, PCI_BASE_ADDRESS_0 + i*4);
 146               if (!x || x == (u32) ~0)
 147                 continue;
 148               if ((x & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
 149                 d->base_addr[i] = x;
 150               else
 151                 {
 152                   if ((x & PCI_BASE_ADDRESS_MEM_TYPE_MASK) != PCI_BASE_ADDRESS_MEM_TYPE_64)
 153                     d->base_addr[i] = x;
 154                   else if (i >= cnt-1)
 155                     a->warning("%04x:%02x:%02x.%d: Invalid 64-bit address seen for BAR %d.", d->domain, d->bus, d->dev, d->func, i);
 156                   else
 157                     {
 158                       u32 y = pci_read_long(d, PCI_BASE_ADDRESS_0 + (++i)*4);
 159 #ifdef PCI_HAVE_64BIT_ADDRESS
 160                       d->base_addr[i-1] = x | (((pciaddr_t) y) << 32);
 161 #else
 162                       if (y)
 163                         a->warning("%04x:%02x:%02x.%d 64-bit device address ignored.", d->domain, d->bus, d->dev, d->func);
 164                       else
 165                         d->base_addr[i-1] = x;
 166 #endif
 167                     }
 168                 }
 169             }
 170         }
 171     }
 172
 173   if (want_fill(d, flags, PCI_FILL_ROM_BASE))
 174     {
 175       int reg = 0;
 176       d->rom_base_addr = 0;
 177       switch (get_hdr_type(d))
 178         {
 179         case PCI_HEADER_TYPE_NORMAL:
 180           reg = PCI_ROM_ADDRESS;
 181           break;
 182         case PCI_HEADER_TYPE_BRIDGE:
 183           reg = PCI_ROM_ADDRESS1;
 184           break;
 185         }
 186       if (reg)
 187         {
 188           u32 u = pci_read_long(d, reg);
 189           if (u != 0xffffffff)
 190             d->rom_base_addr = u;
 191         }
 192     }
 193
 194   pci_scan_caps(d, flags);
 195 }
 196
 197 static int
 198 pci_generic_block_op(struct pci_dev *d, int pos, byte *buf, int len,
 199                  int (*r)(struct pci_dev *d, int pos, byte *buf, int len))
 200 {
 201   if ((pos & 1) && len >= 1)
 202     {
 203       if (!r(d, pos, buf, 1))
 204         return 0;
 205       pos++; buf++; len--;
 206     }
 207   if ((pos & 3) && len >= 2)
 208     {
 209       if (!r(d, pos, buf, 2))
 210         return 0;
 211       pos += 2; buf += 2; len -= 2;
 212     }
 213   while (len >= 4)
 214     {
 215       if (!r(d, pos, buf, 4))
 216         return 0;
 217       pos += 4; buf += 4; len -= 4;
 218     }
 219   if (len >= 2)
 220     {
 221       if (!r(d, pos, buf, 2))
 222         return 0;
 223       pos += 2; buf += 2; len -= 2;
 224     }
 225   if (len && !r(d, pos, buf, 1))
 226     return 0;
 227   return 1;
 228 }
 229
 230 int
 231 pci_generic_block_read(struct pci_dev *d, int pos, byte *buf, int len)
 232 {
 233   return pci_generic_block_op(d, pos, buf, len, d->access->methods->read);
 234 }
 235
 236 int
 237 pci_generic_block_write(struct pci_dev *d, int pos, byte *buf, int len)
 238 {
 239   return pci_generic_block_op(d, pos, buf, len, d->access->methods->write);
 240 }