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8870 do not lock cpu when waiting for IBF or OBF #26

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8870 do not lock cpu when waiting for IBF or OBF #26

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13 changes: 13 additions & 0 deletions usr/src/uts/intel/io/ipmi/ipmi_kcs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,8 @@ kcs_start_write(struct ipmi_softc *sc)
for (retry = 0; retry < 10; retry++) {
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (status & KCS_STATUS_IBF)
return (0);

/* Clear OBF */
kcs_clear_obf(sc, status);
Expand All @@ -193,6 +195,9 @@ kcs_start_write(struct ipmi_softc *sc)

/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (status & KCS_STATUS_IBF)
return (0);

if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_WRITE)
break;
delay(drv_usectohz(1000000));
Expand Down Expand Up @@ -222,6 +227,8 @@ kcs_write_byte(struct ipmi_softc *sc, uchar_t data)

/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (status & KCS_STATUS_IBF)
return (0);

if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE)
return (0);
Expand All @@ -244,6 +251,8 @@ kcs_write_last_byte(struct ipmi_softc *sc, uchar_t data)

/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (status & KCS_STATUS_IBF)
return (0);

if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE)
/* error state */
Expand Down Expand Up @@ -273,6 +282,8 @@ kcs_read_byte(struct ipmi_softc *sc, uchar_t *data)

/* Wait for OBF = 1 */
status = kcs_wait_for_obf(sc, 1);
if ((status & KCS_STATUS_OBF) == 0)
return (0);

/* Read Data_out */
*data = INB(sc, KCS_DATA);
Expand All @@ -287,6 +298,8 @@ kcs_read_byte(struct ipmi_softc *sc, uchar_t *data)

/* Wait for OBF = 1 */
status = kcs_wait_for_obf(sc, 1);
if ((status & KCS_STATUS_OBF) == 0)
return (0);

/* Read Dummy */
(void) INB(sc, KCS_DATA);
Expand Down