lib/aix-device.c

   1 /*
   2  *      The PCI Library -- AIX /dev/pci[0-n] access
   3  *
   4  *      Copyright (c) 1999 Jari Kirma <kirma@cs.hut.fi>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 /*
  10  *      Read functionality of this driver is briefly tested, and seems
  11  *      to supply basic information correctly, but I promise no more.
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19
  20 #include <sys/types.h>
  21 #include <sys/mdio.h>
  22
  23 #include "internal.h"
  24
  25 #define AIX_LSDEV_CMD "/usr/sbin/lsdev -C -c bus -t pci\\* -S available -F name"
  26 #define AIX_ODMGET_CMD \
  27   "/usr/bin/odmget -q 'name=%s and attribute=bus_number' CuAt | \
  28    /usr/bin/awk '$1 == \"value\" { print $3 }'"
  29
  30
  31 /* AIX PCI bus device information */
  32
  33 typedef struct aix_pci_bus {
  34     char *bus_name;
  35     int   bus_number;
  36     int   bus_fd;
  37 } aix_pci_bus;
  38
  39 #define PCI_BUS_MAX 16          /* arbitrary choice */
  40 static aix_pci_bus pci_buses[PCI_BUS_MAX];
  41 static int pci_bus_count = 0;
  42
  43
  44 /* Utility Routines */
  45
  46 static aix_pci_bus *
  47 aix_find_bus(struct pci_access *a, int bus_number)
  48 {
  49   int i;
  50
  51   for (i = 0; i < pci_bus_count; i++)
  52     {
  53       if (pci_buses[i].bus_number == bus_number)
  54         {
  55           return &pci_buses[i];
  56         }
  57     }
  58
  59   a->error("aix_find_bus: bus number %d not found", bus_number);
  60 }
  61
  62 static int
  63 aix_bus_open(struct pci_access *a, int bus_number)
  64 {
  65   aix_pci_bus *bp = aix_find_bus(a, bus_number);
  66
  67   if (bp->bus_fd < 0)
  68     {
  69       char devbuf[256];
  70       int mode = a->writeable ? O_RDWR : O_RDONLY;
  71
  72       snprintf(devbuf, sizeof (devbuf), "/dev/%s", bp->bus_name);
  73       bp->bus_fd = open(devbuf, mode, 0);
  74       if (bp->bus_fd < 0)
  75         {
  76           a->error("aix_open_bus: %s open failed", devbuf);
  77         }
  78     }
  79
  80   return bp->bus_fd;
  81 }
  82
  83 static int
  84 aix_bus_number(char *name)
  85 {
  86   int bus_number;
  87   FILE *odmget_pipe;
  88   char command[256];
  89   char buf[256];
  90   char *bp;
  91   char *ep;
  92
  93   snprintf(command, sizeof (command), AIX_ODMGET_CMD, name);
  94   odmget_pipe = popen(command, "r");
  95   if (odmget_pipe == NULL)
  96     {
  97       /* popen failed */
  98       return -1;
  99     }
 100
 101   if (fgets(buf, sizeof (buf) - 1, odmget_pipe) != NULL)
 102     {
 103       bp = buf + 1;     /* skip leading double quote */
 104       bus_number = strtol(bp, &ep, 0);
 105       if (bp == ep)
 106         {
 107           /* strtol failed */
 108           bus_number = -1;
 109         }
 110     }
 111   else
 112     {
 113       /* first PCI bus_number is not recorded in ODM CuAt; default to 0 */
 114       bus_number = 0;
 115     }
 116
 117   (void) pclose(odmget_pipe);
 118
 119   return bus_number;
 120 }
 121
 122
 123 /* Method entries */
 124
 125 static int
 126 aix_detect(struct pci_access *a)
 127 {
 128   int len;
 129   int mode = a->writeable ? W_OK : R_OK;
 130   char *command = AIX_LSDEV_CMD;
 131   FILE *lsdev_pipe;
 132   char buf[256];
 133   char *name;
 134
 135   lsdev_pipe = popen(command, "r");
 136   if (lsdev_pipe == NULL)
 137     {
 138       a->error("aix_config: popen(\"%s\") failed", command);
 139     }
 140
 141   while (fgets(buf, sizeof (buf) - 1, lsdev_pipe) != NULL)
 142     {
 143       len = strlen(buf);
 144       while (buf[len-1] == '\n' || buf[len-1] == '\r')
 145           len--;
 146       buf[len] = '\0';                          /* clobber the newline */
 147
 148       name = (char *) pci_malloc(a, len + 1);
 149       strcpy(name, buf);
 150       pci_buses[pci_bus_count].bus_name = name;
 151       pci_buses[pci_bus_count].bus_number = 0;
 152       pci_buses[pci_bus_count].bus_fd = -1;
 153       if (!pci_bus_count)
 154           a->debug("...using %s", name);
 155       else
 156           a->debug(", %s", name);
 157       pci_bus_count++;
 158       if (pci_bus_count >= PCI_BUS_MAX)
 159           break;
 160     }
 161
 162   (void) pclose(lsdev_pipe);
 163
 164   return pci_bus_count;
 165 }
 166
 167 static void
 168 aix_init(struct pci_access *a)
 169 {
 170   char *name;
 171   int i;
 172
 173   for (i = 0; i < pci_bus_count; i++)
 174     {
 175       name = pci_buses[i].bus_name;
 176       pci_buses[i].bus_number = aix_bus_number(name);
 177     }
 178 }
 179
 180 static void
 181 aix_cleanup(struct pci_access *a)
 182 {
 183   aix_pci_bus *bp;
 184
 185   while (pci_bus_count-- > 0)
 186     {
 187       bp = &pci_buses[pci_bus_count];
 188       (void) free(bp->bus_name);
 189       if (bp->bus_fd >= 0)
 190         {
 191           (void) close(bp->bus_fd);
 192           bp->bus_fd = -1;
 193         }
 194     }
 195 }
 196
 197 void
 198 aix_scan(struct pci_access *a)
 199 {
 200   int i;
 201   int bus_number;
 202   byte busmap[256];
 203
 204   memset(busmap, 0, sizeof(busmap));
 205   for (i = 0; i < pci_bus_count; i++)
 206     {
 207       bus_number = pci_buses[i].bus_number;
 208       if (!busmap[bus_number])
 209         {
 210           pci_generic_scan_bus(a, busmap, bus_number);
 211         }
 212     }
 213 }
 214
 215 static int
 216 aix_read(struct pci_dev *d, int pos, byte *buf, int len)
 217 {
 218   struct mdio mdio;
 219   int fd;
 220
 221   if (pos + len > 256)
 222     return 0;
 223
 224   fd = aix_bus_open(d->access, d->bus);
 225   mdio.md_addr = (ulong) pos;
 226   mdio.md_size = len;
 227   mdio.md_incr = MV_BYTE;
 228   mdio.md_data = (char *) buf;
 229   mdio.md_sla = PCI_DEVFN(d->dev, d->func);
 230
 231   if (ioctl(fd, MIOPCFGET, &mdio) < 0)
 232     d->access->error("aix_read: ioctl(MIOPCFGET) failed");
 233
 234   return 1;
 235 }
 236
 237 static int
 238 aix_write(struct pci_dev *d, int pos, byte *buf, int len)
 239 {
 240   struct mdio mdio;
 241   int fd;
 242
 243   if (pos + len > 256)
 244     return 0;
 245
 246   fd = aix_bus_open(d->access, d->bus);
 247   mdio.md_addr = (ulong) pos;
 248   mdio.md_size = len;
 249   mdio.md_incr = MV_BYTE;
 250   mdio.md_data = (char *) buf;
 251   mdio.md_sla = PCI_DEVFN(d->dev, d->func);
 252
 253   if (ioctl(fd, MIOPCFPUT, &mdio) < 0)
 254     {
 255       d->access->error("aix_write: ioctl(MIOPCFPUT) failed");
 256     }
 257
 258   return 1;
 259 }
 260
 261 struct pci_methods pm_aix_device = {
 262   "aix-device",
 263   "AIX /dev/pci[0-n]",
 264   NULL,
 265   aix_detect,
 266   aix_init,
 267   aix_cleanup,
 268   aix_scan,
 269   pci_generic_fill_info,
 270   aix_read,
 271   aix_write,
 272   NULL,                                 /* read_vpd */
 273   NULL,                                 /* dev_init */
 274   NULL                                  /* dev_cleanup */
 275 };