lib/obsd-device.c

   1 /*
   2  *      The PCI Library -- OpenBSD /dev/pci access
   3  *
   4  *      Adapted from fbsd-device.c by Matthieu Herrb <matthieu.herrb@laas.fr>, 2006
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <fcntl.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <errno.h>
  13 #include <sys/endian.h>
  14 #include <sys/types.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/pciio.h>
  17 #include "internal.h"
  18
  19 static void
  20 obsd_config(struct pci_access *a)
  21 {
  22   pci_define_param(a, "obsd.path", PCI_PATH_OBSD_DEVICE, "Path to the OpenBSD PCI device");
  23 }
  24
  25 static int
  26 obsd_detect(struct pci_access *a)
  27 {
  28   char *name = pci_get_param(a, "obsd.path");
  29
  30   if (access(name, R_OK))
  31     {
  32       a->warning("Cannot open %s", name);
  33       return 0;
  34     }
  35   a->debug("...using %s", name);
  36   return 1;
  37 }
  38
  39 static void
  40 obsd_init(struct pci_access *a)
  41 {
  42   char *name = pci_get_param(a, "obsd.path");
  43
  44   a->fd = open(name, O_RDWR, 0);
  45   if (a->fd < 0)
  46     a->error("obsd_init: %s open failed", name);
  47 }
  48
  49 static void
  50 obsd_cleanup(struct pci_access *a)
  51 {
  52   close(a->fd);
  53 }
  54
  55 static int
  56 obsd_read(struct pci_dev *d, int pos, byte *buf, int len)
  57 {
  58   struct pci_io pi;
  59   union {
  60           u_int32_t u32;
  61           u_int16_t u16[2];
  62           u_int8_t u8[4];
  63   } u;
  64
  65   if (!(len == 1 || len == 2 || len == 4))
  66     return pci_generic_block_read(d, pos, buf, len);
  67
  68   if (pos >= 256)
  69     return 0;
  70
  71   pi.pi_sel.pc_bus = d->bus;
  72   pi.pi_sel.pc_dev = d->dev;
  73   pi.pi_sel.pc_func = d->func;
  74
  75   pi.pi_reg = pos - (pos % 4);
  76   pi.pi_width = 4;
  77
  78   if (ioctl(d->access->fd, PCIOCREAD, &pi) < 0) {
  79           if (errno == ENXIO)
  80                   pi.pi_data = 0xffffffff;
  81           else
  82                   d->access->error("obsd_read: ioctl(PCIOCREAD) failed");
  83   }
  84   u.u32 = pi.pi_data;
  85
  86   switch (len)
  87     {
  88     case 1:
  89       buf[0] = (u8) u.u8[pos % 4];
  90       break;
  91     case 2:
  92       ((u16 *) buf)[0] = letoh16(u.u16[(pos % 4) / 2]);
  93       break;
  94     case 4:
  95       ((u32 *) buf)[0] = (u32) letoh32(pi.pi_data);
  96       break;
  97     }
  98   return 1;
  99 }
 100
 101 static int
 102 obsd_write(struct pci_dev *d, int pos, byte *buf, int len)
 103 {
 104   struct pci_io pi;
 105
 106   if (!(len == 1 || len == 2 || len == 4))
 107     return pci_generic_block_write(d, pos, buf, len);
 108
 109   if (pos >= 256)
 110     return 0;
 111
 112   pi.pi_sel.pc_bus = d->bus;
 113   pi.pi_sel.pc_dev = d->dev;
 114   pi.pi_sel.pc_func = d->func;
 115
 116   pi.pi_reg = pos;
 117   pi.pi_width = len;
 118
 119   switch (len)
 120     {
 121     case 1:
 122       pi.pi_data = buf[0];
 123       break;
 124     case 2:
 125       pi.pi_data = ((u16 *) buf)[0];
 126       break;
 127     case 4:
 128       pi.pi_data = ((u32 *) buf)[0];
 129       break;
 130     }
 131
 132   if (ioctl(d->access->fd, PCIOCWRITE, &pi) < 0)
 133     d->access->error("obsd_write: ioctl(PCIOCWRITE) failed");
 134
 135   return 1;
 136 }
 137
 138 struct pci_methods pm_obsd_device = {
 139   "obsd-device",
 140   "/dev/pci on OpenBSD",
 141   obsd_config,
 142   obsd_detect,
 143   obsd_init,
 144   obsd_cleanup,
 145   pci_generic_scan,
 146   pci_generic_fill_info,
 147   obsd_read,
 148   obsd_write,
 149   NULL,                                 /* read_vpd */
 150   NULL,                                 /* dev_init */
 151   NULL                                  /* dev_cleanup */
 152 };