payloads/libpayload/libpci/libpci.c

   1 /*
   2  *
   3  * Copyright (C) 2010 coresystems GmbH
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <libpayload.h>
  30 #include <pci.h>
  31 #include <pci/pci.h>
  32
  33 /* libpci shim */
  34 static pcidev_t libpci_to_lb(struct pci_dev *dev)
  35 {
  36         return PCI_DEV(dev->bus, dev->dev, dev->func);
  37 }
  38
  39 /* libpci interface */
  40 u8 pci_read_byte(struct pci_dev *dev, int pos)
  41 {
  42         return pci_read_config8(libpci_to_lb(dev), (uint16_t)pos);
  43 }
  44
  45 u16 pci_read_word(struct pci_dev *dev, int pos)
  46 {
  47         return pci_read_config16(libpci_to_lb(dev), (uint16_t)pos);
  48 }
  49
  50 u32 pci_read_long(struct pci_dev *dev, int pos)
  51 {
  52         return pci_read_config32(libpci_to_lb(dev), (uint16_t)pos);
  53 }
  54
  55 int pci_write_byte(struct pci_dev *dev, int pos, u8 data)
  56 {
  57         pci_write_config8(libpci_to_lb(dev), (uint16_t)pos, data);
  58         return 1; /* success */
  59 }
  60
  61 int pci_write_word(struct pci_dev *dev, int pos, u16 data)
  62 {
  63         pci_write_config16(libpci_to_lb(dev), (uint16_t)pos, data);
  64         return 1; /* success */
  65 }
  66
  67 int pci_write_long(struct pci_dev *dev, int pos, u32 data)
  68 {
  69         pci_write_config32(libpci_to_lb(dev), (uint16_t)pos, data);
  70         return 1; /* success */
  71 }
  72
  73 struct pci_access *pci_alloc(void)
  74 {
  75         return malloc(sizeof(struct pci_access));
  76 }
  77
  78 void pci_init(struct pci_access *pacc)
  79 {
  80         memset(pacc, 0, sizeof(*pacc));
  81 }
  82
  83 void pci_cleanup(__attribute__((unused)) struct pci_access *pacc)
  84 {
  85 }
  86
  87 void pci_filter_init(struct pci_access* pacc, struct pci_filter* pf)
  88 {
  89         pf->domain = -1;
  90         pf->bus = -1;
  91         pf->dev = -1;
  92         pf->func = -1;
  93         pf->vendor = -1;
  94         pf->device = -1;
  95 }
  96
  97 static char invalid_pci_device_string[] = "invalid pci device string";
  98
  99 /* parse domain:bus:dev.func (with all components but "dev" optional)
 100  * into filter.
 101  * Returns NULL on success, a string pointer to the error message otherwise.
 102  */
 103 char *pci_filter_parse_slot(struct pci_filter* filter, const char* id)
 104 {
 105         char *endptr;
 106
 107         filter->func = filter->dev = filter->bus = filter->domain = -1;
 108
 109         char *funcp = strrchr(id, '.');
 110         if (funcp) {
 111                 filter->func = strtol(funcp+1, &endptr, 0);
 112                 if (endptr[0] != '\0') return invalid_pci_device_string;
 113         }
 114
 115         char *devp = strrchr(id, ':');
 116         if (!devp) {
 117                 filter->dev = strtol(id, &endptr, 0);
 118         } else {
 119                 filter->dev = strtol(devp+1, &endptr, 0);
 120         }
 121         if (endptr != funcp) return invalid_pci_device_string;
 122         if (!devp) return NULL;
 123
 124         char *busp = strchr(id, ':');
 125         if (busp == devp) {
 126                 filter->bus = strtol(id, &endptr, 0);
 127         } else {
 128                 filter->bus = strtol(busp+1, &endptr, 0);
 129         }
 130         if (endptr != funcp) return invalid_pci_device_string;
 131         if (busp == devp) return NULL;
 132
 133         filter->domain = strtol(id, &endptr, 0);
 134         if (endptr != busp) return invalid_pci_device_string;
 135
 136         return NULL;
 137 }
 138
 139 int pci_filter_match(struct pci_filter* pf, struct pci_dev* dev)
 140 {
 141         if ((pf->domain > -1) && (pf->domain != dev->domain))
 142                 return 0;
 143         if ((pf->bus > -1) && (pf->bus != dev->bus))
 144                 return 0;
 145         if ((pf->dev > -1) && (pf->dev != dev->dev))
 146                 return 0;
 147         if ((pf->func > -1) && (pf->func != dev->func))
 148                 return 0;
 149         if ((pf->vendor > -1) && (pf->vendor != dev->vendor_id))
 150                 return 0;
 151         if ((pf->device > -1) && (pf->device != dev->device_id))
 152                 return 0;
 153         return 1;
 154 }
 155
 156 static struct pci_dev *pci_scan_single_bus(struct pci_dev *dev, uint8_t bus)
 157 {
 158         int devfn;
 159         u32 val;
 160         unsigned char hdr;
 161
 162         for (devfn = 0; devfn < 0x100; devfn++) {
 163                 uint8_t func = devfn & 0x7;
 164                 uint8_t slot = (devfn >> 3) & 0x1f;
 165
 166                 val = pci_read_config32(PCI_DEV(bus, slot, func),
 167                                         REG_VENDOR_ID);
 168
 169                 if (val == 0xffffffff || val == 0x00000000 ||
 170                     val == 0x0000ffff || val == 0xffff0000)
 171                         continue;
 172
 173                 dev->next = malloc(sizeof(struct pci_dev));
 174                 dev = dev->next;
 175                 dev->domain = 0;
 176                 dev->bus = bus;
 177                 dev->dev = slot;
 178                 dev->func = func;
 179                 dev->vendor_id = val & 0xffff;
 180                 dev->device_id = (uint16_t)(val >> 16);
 181                 dev->device_class = pci_read_config16(PCI_DEV(bus, slot, func), PCI_CLASS_DEVICE);
 182                 dev->next = 0;
 183
 184                 hdr = pci_read_config8(PCI_DEV(bus, slot, func),
 185                                        REG_HEADER_TYPE);
 186                 hdr &= 0x7F;
 187
 188                 if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
 189                         uint8_t busses;
 190                         busses = (uint8_t)(pci_read_config32(
 191                                 PCI_DEV(bus, slot, func),
 192                                 REG_PRIMARY_BUS) >> 8);
 193
 194                         /* Avoid recursion if the new bus is the same as
 195                          * the old bus (insert lame The Who joke here) */
 196
 197                         if (busses != bus)
 198                                 dev = pci_scan_single_bus(dev, busses);
 199                 }
 200         }
 201
 202         return dev;
 203 }
 204
 205 void pci_scan_bus(struct pci_access* pacc)
 206 {
 207         struct pci_dev rootdev;
 208         pci_scan_single_bus(&rootdev, 0);
 209         pacc->devices = rootdev.next;
 210 }
 211
 212 struct pci_dev *pci_get_dev(struct pci_access* pacc, u16 domain, u8 bus, u8 dev, u8 func)
 213 {
 214         struct pci_dev *cur = malloc(sizeof(*cur));
 215         cur->domain = domain;
 216         cur->bus = bus;
 217         cur->dev = dev;
 218         cur->func = func;
 219         return cur;
 220 }
 221
 222 void pci_free_dev(struct pci_dev *const dev)
 223 {
 224         free(dev);
 225 }