lib/access.c

   1 /*
   2  *      The PCI Library -- User Access
   3  *
   4  *      Copyright (c) 1997--2014 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <stdarg.h>
  12 #include <string.h>
  13
  14 #include "internal.h"
  15
  16 void
  17 pci_scan_bus(struct pci_access *a)
  18 {
  19   a->methods->scan(a);
  20 }
  21
  22 struct pci_dev *
  23 pci_alloc_dev(struct pci_access *a)
  24 {
  25   struct pci_dev *d = pci_malloc(a, sizeof(struct pci_dev));
  26
  27   memset(d, 0, sizeof(*d));
  28   d->access = a;
  29   d->methods = a->methods;
  30   d->hdrtype = -1;
  31   d->numa_node = -1;
  32   if (d->methods->init_dev)
  33     d->methods->init_dev(d);
  34   return d;
  35 }
  36
  37 int
  38 pci_link_dev(struct pci_access *a, struct pci_dev *d)
  39 {
  40   d->next = a->devices;
  41   a->devices = d;
  42
  43   /*
  44    * Applications compiled with older versions of libpci do not expect
  45    * 32-bit domain numbers. To keep them working, we keep a 16-bit
  46    * version of the domain number at the previous location in struct
  47    * pci_dev. This will keep backward compatibility on systems which
  48    * don't require large domain numbers.
  49    */
  50   if (d->domain > 0xffff)
  51     d->domain_16 = 0xffff;
  52   else
  53     d->domain_16 = d->domain;
  54
  55   return 1;
  56 }
  57
  58 struct pci_dev *
  59 pci_get_dev(struct pci_access *a, int domain, int bus, int dev, int func)
  60 {
  61   struct pci_dev *d = pci_alloc_dev(a);
  62
  63   d->domain = domain;
  64   d->bus = bus;
  65   d->dev = dev;
  66   d->func = func;
  67   return d;
  68 }
  69
  70 void pci_free_dev(struct pci_dev *d)
  71 {
  72   if (d->methods->cleanup_dev)
  73     d->methods->cleanup_dev(d);
  74   pci_free_caps(d);
  75   pci_mfree(d->module_alias);
  76   pci_mfree(d->label);
  77   pci_mfree(d->phy_slot);
  78   pci_mfree(d);
  79 }
  80
  81 static inline void
  82 pci_read_data(struct pci_dev *d, void *buf, int pos, int len)
  83 {
  84   if (pos & (len-1))
  85     d->access->error("Unaligned read: pos=%02x, len=%d", pos, len);
  86   if (pos + len <= d->cache_len)
  87     memcpy(buf, d->cache + pos, len);
  88   else if (!d->methods->read(d, pos, buf, len))
  89     memset(buf, 0xff, len);
  90 }
  91
  92 byte
  93 pci_read_byte(struct pci_dev *d, int pos)
  94 {
  95   byte buf;
  96   pci_read_data(d, &buf, pos, 1);
  97   return buf;
  98 }
  99
 100 word
 101 pci_read_word(struct pci_dev *d, int pos)
 102 {
 103   word buf;
 104   pci_read_data(d, &buf, pos, 2);
 105   return le16_to_cpu(buf);
 106 }
 107
 108 u32
 109 pci_read_long(struct pci_dev *d, int pos)
 110 {
 111   u32 buf;
 112   pci_read_data(d, &buf, pos, 4);
 113   return le32_to_cpu(buf);
 114 }
 115
 116 int
 117 pci_read_block(struct pci_dev *d, int pos, byte *buf, int len)
 118 {
 119   return d->methods->read(d, pos, buf, len);
 120 }
 121
 122 int
 123 pci_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
 124 {
 125   return d->methods->read_vpd ? d->methods->read_vpd(d, pos, buf, len) : 0;
 126 }
 127
 128 static inline int
 129 pci_write_data(struct pci_dev *d, void *buf, int pos, int len)
 130 {
 131   if (pos & (len-1))
 132     d->access->error("Unaligned write: pos=%02x,len=%d", pos, len);
 133   if (pos + len <= d->cache_len)
 134     memcpy(d->cache + pos, buf, len);
 135   return d->methods->write(d, pos, buf, len);
 136 }
 137
 138 int
 139 pci_write_byte(struct pci_dev *d, int pos, byte data)
 140 {
 141   return pci_write_data(d, &data, pos, 1);
 142 }
 143
 144 int
 145 pci_write_word(struct pci_dev *d, int pos, word data)
 146 {
 147   word buf = cpu_to_le16(data);
 148   return pci_write_data(d, &buf, pos, 2);
 149 }
 150
 151 int
 152 pci_write_long(struct pci_dev *d, int pos, u32 data)
 153 {
 154   u32 buf = cpu_to_le32(data);
 155   return pci_write_data(d, &buf, pos, 4);
 156 }
 157
 158 int
 159 pci_write_block(struct pci_dev *d, int pos, byte *buf, int len)
 160 {
 161   if (pos < d->cache_len)
 162     {
 163       int l = (pos + len >= d->cache_len) ? (d->cache_len - pos) : len;
 164       memcpy(d->cache + pos, buf, l);
 165     }
 166   return d->methods->write(d, pos, buf, len);
 167 }
 168
 169 int
 170 pci_fill_info_v35(struct pci_dev *d, int flags)
 171 {
 172   if (flags & PCI_FILL_RESCAN)
 173     {
 174       flags &= ~PCI_FILL_RESCAN;
 175       d->known_fields = 0;
 176       pci_free_caps(d);
 177     }
 178   if (flags & ~d->known_fields)
 179     d->known_fields |= d->methods->fill_info(d, flags & ~d->known_fields);
 180   return d->known_fields;
 181 }
 182
 183 /* In version 3.1, pci_fill_info got new flags => versioned alias */
 184 /* In versions 3.2, 3.3, 3.4 and 3.5, the same has happened */
 185 STATIC_ALIAS(int pci_fill_info(struct pci_dev *d, int flags), pci_fill_info_v35(d, flags));
 186 DEFINE_ALIAS(int pci_fill_info_v30(struct pci_dev *d, int flags), pci_fill_info_v35);
 187 DEFINE_ALIAS(int pci_fill_info_v31(struct pci_dev *d, int flags), pci_fill_info_v35);
 188 DEFINE_ALIAS(int pci_fill_info_v32(struct pci_dev *d, int flags), pci_fill_info_v35);
 189 DEFINE_ALIAS(int pci_fill_info_v33(struct pci_dev *d, int flags), pci_fill_info_v35);
 190 DEFINE_ALIAS(int pci_fill_info_v34(struct pci_dev *d, int flags), pci_fill_info_v35);
 191 SYMBOL_VERSION(pci_fill_info_v30, pci_fill_info@LIBPCI_3.0);
 192 SYMBOL_VERSION(pci_fill_info_v31, pci_fill_info@LIBPCI_3.1);
 193 SYMBOL_VERSION(pci_fill_info_v32, pci_fill_info@LIBPCI_3.2);
 194 SYMBOL_VERSION(pci_fill_info_v33, pci_fill_info@LIBPCI_3.3);
 195 SYMBOL_VERSION(pci_fill_info_v34, pci_fill_info@LIBPCI_3.4);
 196 SYMBOL_VERSION(pci_fill_info_v35, pci_fill_info@@LIBPCI_3.5);
 197
 198 void
 199 pci_setup_cache(struct pci_dev *d, byte *cache, int len)
 200 {
 201   d->cache = cache;
 202   d->cache_len = len;
 203 }