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Index: sys/dev/tpm/tpm.c
===================================================================
--- sys/dev/tpm/tpm.c
+++ sys/dev/tpm/tpm.c
@@ -195,6 +195,8 @@
int tpm_legacy_end(struct tpm_softc *, int, int);
static int tpm_transmit_header(struct tpm_softc *, uint32_t, uint32_t *);
+static int tpm_tis12_devid_index(uint32_t);
+static int tpm_tis12_resume(struct tpm_softc *);
/*
@@ -329,19 +331,14 @@
}
/*
- * Setup interrupt vector if one is provided and interrupts are know to
- * work on that particular chip.
+ * Setup the interrupt vector if one is provided and interrupts are known
+ * to work on that particular chip. The caller must hold locality zero.
*/
int
tpm_tis12_irqinit(struct tpm_softc *sc, int irq, int idx)
{
u_int32_t r;
- if ((irq == IRQUNK) || (tpm_devs[idx].flags & TPM_DEV_NOINTS)) {
- sc->sc_vector = IRQUNK;
- return 0;
- }
-
/* Ack and disable all interrupts. */
bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE,
bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INTERRUPT_ENABLE) &
@@ -349,6 +346,11 @@
bus_space_write_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS,
bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_INT_STATUS));
+ if ((irq == IRQUNK) || (tpm_devs[idx].flags & TPM_DEV_NOINTS)) {
+ sc->sc_vector = IRQUNK;
+ return 0;
+ }
+
/* Program interrupt vector. */
bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_INT_VECTOR, irq);
sc->sc_vector = irq;
@@ -365,6 +367,17 @@
return 0;
}
+static int
+tpm_tis12_devid_index(uint32_t devid)
+{
+ int i;
+
+ for (i = 0; tpm_devs[i].devid != 0; i++)
+ if (tpm_devs[i].devid == devid)
+ break;
+ return (i);
+}
+
/* Setup TPM using TIS 1.2 interface. */
int
tpm_tis12_init(struct tpm_softc *sc, int irq, const char *name)
@@ -386,19 +399,17 @@
sc->sc_devid = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_ID);
sc->sc_rev = bus_space_read_1(sc->sc_bt, sc->sc_bh, TPM_REV);
- for (i = 0; tpm_devs[i].devid; i++)
- if (tpm_devs[i].devid == sc->sc_devid)
- break;
+ i = tpm_tis12_devid_index(sc->sc_devid);
if (tpm_devs[i].devid)
printf(": %s rev 0x%x\n", tpm_devs[i].name, sc->sc_rev);
else
printf(": device 0x%08x rev 0x%x\n", sc->sc_devid, sc->sc_rev);
- if (tpm_tis12_irqinit(sc, irq, i))
+ if (tpm_request_locality(sc, 0))
return 1;
- if (tpm_request_locality(sc, 0))
+ if (tpm_tis12_irqinit(sc, irq, i))
return 1;
/* Abort whatever it thought it was doing. */
@@ -407,6 +418,40 @@
return 0;
}
+/* Restore TIS state which is not guaranteed to survive S3. */
+static int
+tpm_tis12_resume(struct tpm_softc *sc)
+{
+ uint32_t capabilities, devid;
+ int error, i, irq;
+
+ capabilities = bus_space_read_4(sc->sc_bt, sc->sc_bh,
+ TPM_INTF_CAPABILITIES);
+ if ((capabilities & TPM_CAPSREQ) != TPM_CAPSREQ ||
+ (capabilities & (TPM_INTF_INT_EDGE_RISING |
+ TPM_INTF_INT_LEVEL_LOW)) == 0)
+ return (ENXIO);
+ devid = bus_space_read_4(sc->sc_bt, sc->sc_bh, TPM_ID);
+ if (devid == UINT32_MAX || devid != sc->sc_devid)
+ return (ENXIO);
+
+ sc->sc_capabilities = capabilities;
+ i = tpm_tis12_devid_index(devid);
+ irq = sc->sc_vector;
+ error = tpm_request_locality(sc, 0);
+ if (error != 0)
+ return (error);
+ error = tpm_tis12_irqinit(sc, irq, i);
+ if (error != 0)
+ return (error);
+
+ /* Abort firmware residue and leave the command FIFO ready. */
+ bus_space_write_1(sc->sc_bt, sc->sc_bh, TPM_STS,
+ TPM_STS_CMD_READY);
+ return (tpm_waitfor(sc, TPM_STS_CMD_READY, TPM_READY_TMO,
+ sc->sc_write));
+}
+
int
tpm_request_locality(struct tpm_softc *sc, int l)
{
@@ -584,21 +629,25 @@
return (0);
}
-/*
- * Handle resume event. Actually nothing to do as the BIOS is supposed
- * to restore the previously saved state.
- */
+/* Handle resume after firmware has restored the saved TPM state. */
int
tpm_resume(device_t dev)
{
- struct tpm_softc *sc = device_get_softc(dev);
- int why = 0;
+ struct tpm_softc *sc;
+ int error;
+
+ sc = device_get_softc(dev);
+ error = 0;
+ if (sc->sc_init == tpm_tis12_init)
+ error = tpm_tis12_resume(sc);
#ifdef TPM_DEBUG
- printf("tpm_resume: resume: %d -> %d\n", sc->sc_suspend, why);
+ device_printf(dev, "resume: %d -> 0\n", sc->sc_suspend);
#endif
- sc->sc_suspend = why;
+ sc->sc_suspend = 0;
+ if (error != 0)
+ device_printf(dev, "failed to restore TIS state: %d\n", error);
- return 0;
+ return (error);
}
/* Dispatch suspend and resume events. */

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