apps/lib/libmeinos/pci.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <sys/types.h>
  20 #include <stdint.h>
  21 #include <ioport.h>
  22 #include <stdlib.h>
  23 #include <pci.h>
  24
  25 /**
  26  * Reads dword from config register of PCI device
  27  *  @param dev PCI device
  28  *  @param offset Register offset
  29  *  @return Register content
  30  */
  31 uint32_t pci_config_readd(pcidev_t *dev,size_t offset) {
  32   return 0;
  33 }
  34
  35 /**
  36  * Writes dword in config register of PCI device
  37  *  @param dev PCI device
  38  *  @param offset Register offset
  39  *  @param val Value to write
  40  */
  41 void pci_config_writed(pcidev_t *dev,size_t offset,uint32_t val) {
  42
  43 }
  44
  45
  46 /**
  47  * Finds PCI device by VendorID and DeviceID
  48  *  @param dev Pointer to PCI device
  49  *  @param vendorid VendorID
  50  *  @param deviceid DeviceID
  51  *  @param index If more than 1 device is found, select n'th one
  52  *  @return Whether device was found
  53  */
  54 int pci_finddev_byids(pcidev_t *dev,int vendorid,int deviceid,int index) {
  55   for (dev->bus=0;dev->bus<PCI_MAXBUSSES;dev->bus++) {
  56     for (dev->slot=0;dev->slot<PCI_MAXSLOTS;dev->slot++) {
  57       if (pci_get_vendorid(dev)==vendorid && pci_get_deviceid(dev)==deviceid) {
  58         if (!index) return 1;
  59         else index--;
  60       }
  61     }
  62   }
  63   return 0;
  64 }
  65
  66 /**
  67  * Finds PCI device by Classcode and Subclass
  68  *  @param dev Pointer to PCI device
  69  *  @param classcode Classcode
  70  *  @param subclass Subclass
  71  *  @param index If more than 1 device is found, select n'th one
  72  *  @return Whether device was found
  73  */
  74 int pci_finddev_byclass(pcidev_t *dev,int classcode,int subclass,int index) {
  75   for (dev->bus=0;dev->bus<PCI_MAXBUSSES;dev->bus++) {
  76     for (dev->slot=0;dev->slot<PCI_MAXSLOTS;dev->slot++) {
  77       if (pci_get_subclass(dev)==classcode && pci_get_subclass(dev)==subclass) {
  78         if (!index) return 1;
  79         else index--;
  80       }
  81     }
  82   }
  83   return 0;
  84 }
  85
  86 /**
  87  * Returns Pointer to BAR structure
  88  *  @param dev PCI device
  89  *  @param barnum Number of BAR register (0..5)
  90  *  @return Pointer to BAR structure
  91  */
  92 pcibar_t *pci_getbar(pcidev_t *dev,int barnum) {
  93   pcibar_t *bar = malloc(sizeof(pcibar_t));
  94   uint32_t bar_value = pci_config_readd(dev,barnum*4+0x10);
  95   bar->type = bar_value&1;
  96   if (bar->type==PCI_BARTYPE_MEMORY) {
  97     bar->addr = (void*)(bar_value&0xFFFFFFF0);
  98     pci_config_writed(dev,barnum*4+0x10,0xFFFFFFF0|bar->type);
  99     bar->size = pci_config_readd(dev,barnum*4+0x10);
 100     bar->size = (~bar->size|0xF)+1;
 101     pci_config_writed(dev,barnum*4+0x10,bar_value);
 102   }
 103   else bar->ioport = bar_value&0xFFFFFFFC;
 104   return bar;
 105 }