/* Probe for TPM using legacy interface. */
int
tpm_legacy_probe(bus_space_tag_t iot, bus_addr_t iobase)
{
bus_space_handle_t ioh;
u_int8_t r, v;
int i, rv = 0;
char id[8];
if (!tpm_enabled || iobase == -1)
return 0;
if (bus_space_map(iot, iobase, 2, 0, &ioh))
return 0;
v = bus_space_read_1(iot, ioh, 0);
if (v == 0xff) {
bus_space_unmap(iot, ioh, 2);
return 0;
}
r = bus_space_read_1(iot, ioh, 1);
for (i = sizeof(id); i--; )
id[i] = tpm_legacy_in(iot, ioh, TPM_ID + i);
#ifdef TPM_DEBUG
printf("tpm_legacy_probe %.4s %d.%d.%d.%d\n",
&id[4], id[0], id[1], id[2], id[3]);
#endif
/*
* The only chips using the legacy interface we are aware of are
* by Atmel. For other chips more signature would have to be added.
*/
if (!bcmp(&id[4], "ATML", 4))
rv = 1;
if (!rv) {
bus_space_write_1(iot, ioh, r, 1);
bus_space_write_1(iot, ioh, v, 0);
}
bus_space_unmap(iot, ioh, 2);
return rv;
}
/* Setup TPM using legacy interface. */
int
tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name)
{
char id[8];
int i;
if ((i = bus_space_map(sc->sc_batm, tpm_enabled, 2, 0, &sc->sc_bahm))) {
aprint_debug_dev(sc->sc_dev, "cannot map tpm registers (%d)\n",
i);
tpm_enabled = 0;
return 1;
}
for (i = sizeof(id); i--; )
id[i] = tpm_legacy_in(sc->sc_bt, sc->sc_bh, TPM_ID + i);
aprint_debug_dev(sc->sc_dev, "%.4s %d.%d @0x%x\n", &id[4], id[0],
id[1], tpm_enabled);
tpm_enabled = 0;
return 0;
}
/* Setup TPM using legacy interface. */
int
tpm_legacy_init(struct tpm_softc *sc, int irq, const char *name)
{
char id[8];
u_int8_t ioh, iol;
int i;
if ((i = bus_space_map(sc->sc_batm, tpm_enabled, 2, 0, &sc->sc_bahm))) {
printf(": cannot map tpm registers (%d)\n", i);
tpm_enabled = 0;
return 1;
}
for (i = sizeof(id); i--; )
id[i] = tpm_legacy_in(sc->sc_bt, sc->sc_bh, TPM_ID + i);
printf(": %.4s %d.%d @0x%x\n", &id[4], id[0], id[1], tpm_enabled);
iol = tpm_enabled & 0xff;
ioh = tpm_enabled >> 16;
tpm_enabled = 0;
return 0;
}
