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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/mman.h>
/* ------------------------------------------------------------- */
#define BASEPATH "/sys/bus/pci/devices"
void *mapbar(char *dev, int bar)
{
char filename[128];
struct stat st;
void *map;
int fd;
snprintf(filename, sizeof(filename),
"%s/%s/resource%d", BASEPATH, dev, bar);
fd = open(filename, O_RDONLY);
if (-1 == fd) {
fprintf(stderr, "open %s: %s", filename, strerror(errno));
return NULL;
}
fstat(fd, &st);
map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (MAP_FAILED == map) {
fprintf(stderr, "mmap %s: %s", filename, strerror(errno));
return NULL;
}
close(fd);
return map;
}
uint32_t readsys(char *dev, char *file)
{
char filename[128], content[128];
FILE *fp;
snprintf(filename, sizeof(filename),
"%s/%s/%s", BASEPATH, dev, file);
fp = fopen(filename, "r");
if (NULL == fp)
return 0;
fgets(content, sizeof(content), fp);
fclose(fp);
return strtol(content, NULL, 0);
}
/* ------------------------------------------------------------- */
static const char *xhci_capname[] = {
[ 0 ] = "Reserved",
[ 1 ] = "USB Legacy Support",
[ 2 ] = "Supported Protocol",
[ 3 ] = "Extended Power Management",
[ 4 ] = "I/O Virtualization",
[ 5 ] = "Message Interrupt",
[ 6 ] = "Local Memory",
[ 7 ... 9 ] = "Reserved",
[ 10 ] = "USB Debug Capability",
[ 11 ... 16 ] = "Reserved",
[ 17 ] = "Extended Message Interrupt",
[ 18 ... 191 ] = "Reserved",
[ 192 ... 255 ] = "Vendor Defined",
};
void xhcidump(char *dev)
{
uint32_t *map, val;
int i, n, ext = 0, off, cid;
map = mapbar(dev, 0);
if (!map)
return;
n = map[0] & 0xff;
if (n > 0x20)
n = 0x20;
printf(" xhci base caps\n");
for (i = 0; i * 4 < n; i++) {
val = map[i];
printf(" 0x%04x: 0x%08x", i * 4, val);
switch (i * 4) {
case 0x00:
printf(" - version %x.%02x, caplength 0x%x",
(val >> 24) & 0xff, (val >> 16) & 0xff, val & 0xff);
break;
case 0x04:
printf(" - ports %d, intrs %d, slots %d",
(val >> 24) & 0xff, (val >> 8) & 0x3ff, val & 0xff);
break;
case 0x08:
printf(" - erst max 0x%x, ist 0x%x",
(val >> 4) & 0x0f, val & 0x0f);
break;
case 0x0c:
printf(" - u2 lat 0x%x, u1 lat 0x%x",
(val >> 16) & 0xffff, val & 0xff);
break;
case 0x10:
ext = (val >> 16) & 0xffff;
printf(" - extptr 0x%x, maxpsasize 0x%x%s%s%s%s%s%s%s%s",
ext, (val >> 12) & 0xf,
(val & 0x80) ? ", nss" : "",
(val & 0x40) ? ", ltc" : "",
(val & 0x20) ? ", lhrc" : "",
(val & 0x10) ? ", pind" : "",
(val & 0x08) ? ", ppc" : "",
(val & 0x04) ? ", csz" : "",
(val & 0x02) ? ", bnc" : "",
(val & 0x01) ? ", ac64" : "");
break;
case 0x14:
printf(" - doorbell offset 0x%x", val);
break;
case 0x18:
printf(" - runtime offset 0x%x", val);
break;
default:
break;
}
printf("\n");
}
while (ext) {
printf(" xhci ext cap @ 0x%x\n", ext*4);
val = map[ext];
off = val >> 8 & 0xff;
cid = val & 0xff;
printf(" 0x%04x: 0x%08x - next 0x%x, cap 0x%x [ %s ]\n",
ext*4, val, off, cid, xhci_capname[cid]);
switch (cid) {
case 2:
printf(" - version %x.%02x\n",
(val >> 24) & 0xff, (val >> 16) & 0xff);
val = map[ext+1];
printf(" 0x%04x: 0x%08x - name %c%c%c%c\n",
ext*4+4, val, val & 0xff, (val >> 8) & 0xff,
(val >> 16) & 0xff, (val >> 24) & 0xff);
val = map[ext+2];
printf(" 0x%04x: 0x%08x - psic 0x%x, port count %d, port offset %d\n",
ext*4+8, val, (val >> 28) & 0xf, (val >> 8) & 0xff, val & 0xff);
break;
}
if (off) {
ext += off;
} else {
ext = 0;
}
}
return;
}
/* ------------------------------------------------------------- */
void ehcidump(char *dev)
{
uint32_t *map, val;
int i, n;
map = mapbar(dev, 0);
if (!map)
return;
n = map[0] & 0xff;
if (n > 0x10)
n = 0x10;
printf(" ehci caps\n");
for (i = 0; i * 4 < n; i++) {
val = map[i];
printf(" 0x%04x: 0x%08x", i * 4, val);
switch (i * 4) {
case 0x00:
printf(" - version %x.%02x, caplength 0x%x",
(val >> 24) & 0xff, (val >> 16) & 0xff, val & 0xff);
break;
case 0x04:
printf(" - dbg port %d%s, companion %d ctl %d prt%s, ports %d",
(val >> 20) & 0x0f,
(val >> 16) & 0x01 ? ", pi" : "",
(val >> 12) & 0x0f,
(val >> 8) & 0x0f,
(val >> 4) & 0x01 ? ", ppc" : "",
(val >> 0) & 0x07);
break;
case 0x08:
printf(" - extptr 0x%x, iso thresh %d%s%s%s",
(val >> 8) & 0xff,
(val >> 4) & 0x0f,
(val >> 2) & 0x01 ? ", aspc" : "",
(val >> 1) & 0x01 ? ", pflf" : "",
(val >> 0) & 0x01 ? ", 64ac" : "");
break;
default:
break;
}
printf("\n");
}
return;
}
/* ------------------------------------------------------------- */
int main(int argc, char *argv[])
{
unsigned long addr0;
struct dirent *entry;
uint32_t class, vendor, device;
DIR *dir;
dir = opendir(BASEPATH);
while ((entry = readdir(dir)) != NULL) {
if (entry->d_name[0] == '.')
continue;
if (argc > 1 && !strstr(entry->d_name, argv[1]))
continue;
class = readsys(entry->d_name, "class");
vendor = readsys(entry->d_name, "vendor");
device = readsys(entry->d_name, "device");
addr0 = readsys(entry->d_name, "resource");
switch (class) {
case 0x0c0300:
printf("uhci @ %s %04x:%04x\n", entry->d_name, vendor, device);
break;
case 0x0c0310:
printf("ohci @ %s %04x:%04x\n", entry->d_name, vendor, device);
break;
case 0x0c0320:
printf("ehci @ %s %04x:%04x\n", entry->d_name, vendor, device);
printf(" bar0 @ 0x%lx\n", addr0);
if (addr0 & 0xfff) {
printf(" Oops, not page aligned, skipping\n");
} else {
ehcidump(entry->d_name);
}
break;
case 0x0c0330:
printf("xhci @ %s %04x:%04x\n", entry->d_name, vendor, device);
printf(" bar0 @ 0x%lx\n", addr0);
xhcidump(entry->d_name);
break;
}
}
return 0;
}
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