/*
* Start to write a request. Waits for IBF to clear and then sends the
* WR_START command.
*/
static int
kcs_start_write(struct ipmi_softc *sc)
{
int retry, status;
for (retry = 0; retry < 10; retry++) {
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
/* Clear OBF */
kcs_clear_obf(sc, status);
/* Write start to command */
OUTB(sc, KCS_CTL_STS, KCS_CONTROL_WRITE_START);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_WRITE)
break;
DELAY(1000000);
}
if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE)
/* error state */
return (0);
/* Clear OBF */
kcs_clear_obf(sc, status);
return (1);
}
/*
* Write a byte of the request message, excluding the last byte of the
* message which requires special handling.
*/
static int
kcs_write_byte(struct ipmi_softc *sc, u_char data)
{
int status;
/* Data to Data */
OUTB(sc, KCS_DATA, data);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE)
return (0);
/* Clear OBF */
kcs_clear_obf(sc, status);
return (1);
}
/*
* Write the last byte of a request message.
*/
static int
kcs_write_last_byte(struct ipmi_softc *sc, u_char data)
{
int status;
/* Write end to command */
OUTB(sc, KCS_CTL_STS, KCS_CONTROL_WRITE_END);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE)
/* error state */
return (0);
/* Clear OBF */
kcs_clear_obf(sc, status);
/* Send data byte to DATA. */
OUTB(sc, KCS_DATA, data);
return (1);
}
static void
kcs_error(struct ipmi_softc *sc)
{
int retry, status;
u_char data;
for (retry = 0; retry < 2; retry++) {
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
/* ABORT */
OUTB(sc, KCS_CTL_STS, KCS_CONTROL_GET_STATUS_ABORT);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
/* Clear OBF */
kcs_clear_obf(sc, status);
if (status & KCS_STATUS_OBF) {
data = INB(sc, KCS_DATA);
if (data != 0)
device_printf(sc->ipmi_dev,
"KCS Error Data %02x\n", data);
}
/* 0x00 to DATA_IN */
OUTB(sc, KCS_DATA, 0x00);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_READ) {
/* Wait for OBF = 1 */
status = kcs_wait_for_obf(sc, 1);
/* Read error status */
data = INB(sc, KCS_DATA);
if (data != 0)
device_printf(sc->ipmi_dev, "KCS error: %02x\n",
data);
/* Write READ into Data_in */
OUTB(sc, KCS_DATA, KCS_DATA_IN_READ);
/* Wait for IBF = 0 */
status = kcs_wait_for_ibf(sc, 0);
}
/* IDLE STATE */
if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_IDLE) {
/* Wait for OBF = 1 */
status = kcs_wait_for_obf(sc, 1);
/* Clear OBF */
kcs_clear_obf(sc, status);
return;
}
}
device_printf(sc->ipmi_dev, "KCS: Error retry exhausted\n");
}