static void reset_flags(struct si_sm_data *bt)
{
if (bt_debug)
printk(KERN_WARNING "IPMI BT: flag reset %s\n",
status2txt(BT_STATUS));
if (BT_STATUS & BT_H_BUSY)
BT_CONTROL(BT_H_BUSY); /* force clear */
BT_CONTROL(BT_CLR_WR_PTR); /* always reset */
BT_CONTROL(BT_SMS_ATN); /* always clear */
BT_INTMASK_W(BT_BMC_HWRST);
}
static void drain_BMC2HOST(struct si_sm_data *bt)
{
int i, size;
if (!(BT_STATUS & BT_B2H_ATN)) /* Not signalling a response */
return;
BT_CONTROL(BT_H_BUSY); /* now set */
BT_CONTROL(BT_B2H_ATN); /* always clear */
BT_STATUS; /* pause */
BT_CONTROL(BT_B2H_ATN); /* some BMCs are stubborn */
BT_CONTROL(BT_CLR_RD_PTR); /* always reset */
if (bt_debug)
printk(KERN_WARNING "IPMI BT: stale response %s; ",
status2txt(BT_STATUS));
size = BMC2HOST;
for (i = 0; i < size ; i++)
BMC2HOST;
BT_CONTROL(BT_H_BUSY); /* now clear */
if (bt_debug)
printk("drained %d bytes\n", size + 1);
}
static void reset_flags(struct si_sm_data *bt)
{
if (BT_STATUS & BT_H_BUSY) BT_CONTROL(BT_H_BUSY);
if (BT_STATUS & BT_B_BUSY) BT_CONTROL(BT_B_BUSY);
BT_CONTROL(BT_CLR_WR_PTR);
BT_CONTROL(BT_SMS_ATN);
if (BT_STATUS & BT_B2H_ATN) {
int i;
BT_CONTROL(BT_H_BUSY);
BT_CONTROL(BT_B2H_ATN);
BT_CONTROL(BT_CLR_RD_PTR);
for (i = 0; i < IPMI_MAX_MSG_LENGTH + 2; i++) BMC2HOST;
BT_CONTROL(BT_H_BUSY);
}
}
static void reset_flags(struct si_sm_data *bt)
{
if (BT_STATUS & BT_H_BUSY) BT_CONTROL(BT_H_BUSY);
if (BT_STATUS & BT_B_BUSY) BT_CONTROL(BT_B_BUSY);
BT_CONTROL(BT_CLR_WR_PTR);
BT_CONTROL(BT_SMS_ATN);
#ifdef DEVELOPMENT_ONLY_NOT_FOR_PRODUCTION
if (BT_STATUS & BT_B2H_ATN) {
int i;
BT_CONTROL(BT_H_BUSY);
BT_CONTROL(BT_B2H_ATN);
BT_CONTROL(BT_CLR_RD_PTR);
for (i = 0; i < IPMI_MAX_MSG_LENGTH + 2; i++) BMC2HOST;
BT_CONTROL(BT_H_BUSY);
}
#endif
}
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
unsigned char status, BT_CAP[8];
static enum bt_states last_printed = BT_STATE_PRINTME;
int i;
status = BT_STATUS;
bt->nonzero_status |= status;
if ((bt_debug & BT_DEBUG_STATES) && (bt->state != last_printed)) {
printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
STATE2TXT,
STATUS2TXT,
bt->timeout,
time);
last_printed = bt->state;
}
/*
* Commands that time out may still (eventually) provide a response.
* This stale response will get in the way of a new response so remove
* it if possible (hopefully during IDLE). Even if it comes up later
* it will be rejected by its (now-forgotten) seq number.
*/
if ((bt->state < BT_STATE_WRITE_BYTES) && (status & BT_B2H_ATN)) {
drain_BMC2HOST(bt);
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
}
if ((bt->state != BT_STATE_IDLE) &&
(bt->state < BT_STATE_PRINTME)) {
/* check timeout */
bt->timeout -= time;
if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1))
return error_recovery(bt,
status,
IPMI_TIMEOUT_ERR);
}
switch (bt->state) {
/*
* Idle state first checks for asynchronous messages from another
* channel, then does some opportunistic housekeeping.
*/
case BT_STATE_IDLE:
if (status & BT_SMS_ATN) {
BT_CONTROL(BT_SMS_ATN); /* clear it */
return SI_SM_ATTN;
}
if (status & BT_H_BUSY) /* clear a leftover H_BUSY */
BT_CONTROL(BT_H_BUSY);
/* Read BT capabilities if it hasn't been done yet */
if (!bt->BT_CAP_outreqs)
BT_STATE_CHANGE(BT_STATE_CAPABILITIES_BEGIN,
SI_SM_CALL_WITHOUT_DELAY);
bt->timeout = bt->BT_CAP_req2rsp;
BT_SI_SM_RETURN(SI_SM_IDLE);
case BT_STATE_XACTION_START:
if (status & (BT_B_BUSY | BT_H2B_ATN))
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
if (BT_STATUS & BT_H_BUSY)
BT_CONTROL(BT_H_BUSY); /* force clear */
BT_STATE_CHANGE(BT_STATE_WRITE_BYTES,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_WRITE_BYTES:
if (status & BT_H_BUSY)
BT_CONTROL(BT_H_BUSY); /* clear */
BT_CONTROL(BT_CLR_WR_PTR);
write_all_bytes(bt);
BT_CONTROL(BT_H2B_ATN); /* can clear too fast to catch */
BT_STATE_CHANGE(BT_STATE_WRITE_CONSUME,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_WRITE_CONSUME:
if (status & (BT_B_BUSY | BT_H2B_ATN))
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
BT_STATE_CHANGE(BT_STATE_READ_WAIT,
SI_SM_CALL_WITHOUT_DELAY);
/* Spinning hard can suppress B2H_ATN and force a timeout */
case BT_STATE_READ_WAIT:
if (!(status & BT_B2H_ATN))
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
BT_CONTROL(BT_H_BUSY); /* set */
/*
* Uncached, ordered writes should just proceeed serially but
* some BMCs don't clear B2H_ATN with one hit. Fast-path a
* workaround without too much penalty to the general case.
*/
BT_CONTROL(BT_B2H_ATN); /* clear it to ACK the BMC */
BT_STATE_CHANGE(BT_STATE_CLEAR_B2H,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_CLEAR_B2H:
if (status & BT_B2H_ATN) {
/* keep hitting it */
BT_CONTROL(BT_B2H_ATN);
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
}
BT_STATE_CHANGE(BT_STATE_READ_BYTES,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_READ_BYTES:
if (!(status & BT_H_BUSY))
/* check in case of retry */
BT_CONTROL(BT_H_BUSY);
BT_CONTROL(BT_CLR_RD_PTR); /* start of BMC2HOST buffer */
i = read_all_bytes(bt); /* true == packet seq match */
BT_CONTROL(BT_H_BUSY); /* NOW clear */
if (!i) /* Not my message */
BT_STATE_CHANGE(BT_STATE_READ_WAIT,
SI_SM_CALL_WITHOUT_DELAY);
bt->state = bt->complete;
return bt->state == BT_STATE_IDLE ? /* where to next? */
SI_SM_TRANSACTION_COMPLETE : /* normal */
SI_SM_CALL_WITHOUT_DELAY; /* Startup magic */
case BT_STATE_LONG_BUSY: /* For example: after FW update */
if (!(status & BT_B_BUSY)) {
reset_flags(bt); /* next state is now IDLE */
bt_init_data(bt, bt->io);
}
return SI_SM_CALL_WITH_DELAY; /* No repeat printing */
case BT_STATE_RESET1:
reset_flags(bt);
drain_BMC2HOST(bt);
BT_STATE_CHANGE(BT_STATE_RESET2,
SI_SM_CALL_WITH_DELAY);
case BT_STATE_RESET2: /* Send a soft reset */
BT_CONTROL(BT_CLR_WR_PTR);
HOST2BMC(3); /* number of bytes following */
HOST2BMC(0x18); /* NetFn/LUN == Application, LUN 0 */
HOST2BMC(42); /* Sequence number */
HOST2BMC(3); /* Cmd == Soft reset */
BT_CONTROL(BT_H2B_ATN);
bt->timeout = BT_RESET_DELAY * 1000000;
BT_STATE_CHANGE(BT_STATE_RESET3,
SI_SM_CALL_WITH_DELAY);
case BT_STATE_RESET3: /* Hold off everything for a bit */
if (bt->timeout > 0)
return SI_SM_CALL_WITH_DELAY;
drain_BMC2HOST(bt);
BT_STATE_CHANGE(BT_STATE_RESTART,
SI_SM_CALL_WITH_DELAY);
case BT_STATE_RESTART: /* don't reset retries or seq! */
bt->read_count = 0;
bt->nonzero_status = 0;
bt->timeout = bt->BT_CAP_req2rsp;
BT_STATE_CHANGE(BT_STATE_XACTION_START,
SI_SM_CALL_WITH_DELAY);
/*
* Get BT Capabilities, using timing of upper level state machine.
* Set outreqs to prevent infinite loop on timeout.
*/
case BT_STATE_CAPABILITIES_BEGIN:
bt->BT_CAP_outreqs = 1;
{
unsigned char GetBT_CAP[] = { 0x18, 0x36 };
bt->state = BT_STATE_IDLE;
bt_start_transaction(bt, GetBT_CAP, sizeof(GetBT_CAP));
}
bt->complete = BT_STATE_CAPABILITIES_END;
BT_STATE_CHANGE(BT_STATE_XACTION_START,
SI_SM_CALL_WITH_DELAY);
case BT_STATE_CAPABILITIES_END:
i = bt_get_result(bt, BT_CAP, sizeof(BT_CAP));
bt_init_data(bt, bt->io);
if ((i == 8) && !BT_CAP[2]) {
bt->BT_CAP_outreqs = BT_CAP[3];
bt->BT_CAP_req2rsp = BT_CAP[6] * 1000000;
bt->BT_CAP_retries = BT_CAP[7];
} else
printk(KERN_WARNING "IPMI BT: using default values\n");
if (!bt->BT_CAP_outreqs)
bt->BT_CAP_outreqs = 1;
printk(KERN_WARNING "IPMI BT: req2rsp=%ld secs retries=%d\n",
bt->BT_CAP_req2rsp / 1000000L, bt->BT_CAP_retries);
bt->timeout = bt->BT_CAP_req2rsp;
return SI_SM_CALL_WITHOUT_DELAY;
default: /* should never occur */
return error_recovery(bt,
status,
IPMI_ERR_UNSPECIFIED);
}
return SI_SM_CALL_WITH_DELAY;
}
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
unsigned char status;
char buf[40]; /* For getting status */
int i;
status = BT_STATUS;
bt->nonzero_status |= status;
if ((bt_debug & BT_DEBUG_STATES) && (bt->state != bt->last_state))
printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
STATE2TXT,
STATUS2TXT(buf),
bt->timeout,
time);
bt->last_state = bt->state;
if (bt->state == BT_STATE_HOSED) return SI_SM_HOSED;
if (bt->state != BT_STATE_IDLE) { /* do timeout test */
/* Certain states, on error conditions, can lock up a CPU
because they are effectively in an infinite loop with
CALL_WITHOUT_DELAY (right back here with time == 0).
Prevent infinite lockup by ALWAYS decrementing timeout. */
/* FIXME: bt_event is sometimes called with time > BT_NORMAL_TIMEOUT
(noticed in ipmi_smic_sm.c January 2004) */
if ((time <= 0) || (time >= BT_NORMAL_TIMEOUT)) time = 100;
bt->timeout -= time;
if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1)) {
error_recovery(bt, "timed out");
return SI_SM_CALL_WITHOUT_DELAY;
}
}
switch (bt->state) {
case BT_STATE_IDLE: /* check for asynchronous messages */
if (status & BT_SMS_ATN) {
BT_CONTROL(BT_SMS_ATN); /* clear it */
return SI_SM_ATTN;
}
return SI_SM_IDLE;
case BT_STATE_XACTION_START:
if (status & BT_H_BUSY) {
BT_CONTROL(BT_H_BUSY);
break;
}
if (status & BT_B2H_ATN) break;
bt->state = BT_STATE_WRITE_BYTES;
return SI_SM_CALL_WITHOUT_DELAY; /* for logging */
case BT_STATE_WRITE_BYTES:
if (status & (BT_B_BUSY | BT_H2B_ATN)) break;
BT_CONTROL(BT_CLR_WR_PTR);
write_all_bytes(bt);
BT_CONTROL(BT_H2B_ATN); /* clears too fast to catch? */
bt->state = BT_STATE_WRITE_CONSUME;
return SI_SM_CALL_WITHOUT_DELAY; /* it MIGHT sail through */
case BT_STATE_WRITE_CONSUME: /* BMCs usually blow right thru here */
if (status & (BT_H2B_ATN | BT_B_BUSY)) break;
bt->state = BT_STATE_B2H_WAIT;
/* fall through with status */
/* Stay in BT_STATE_B2H_WAIT until a packet matches. However, spinning
hard here, constantly reading status, seems to hold off the
generation of B2H_ATN so ALWAYS return CALL_WITH_DELAY. */
case BT_STATE_B2H_WAIT:
if (!(status & BT_B2H_ATN)) break;
/* Assume ordered, uncached writes: no need to wait */
if (!(status & BT_H_BUSY)) BT_CONTROL(BT_H_BUSY); /* set */
BT_CONTROL(BT_B2H_ATN); /* clear it, ACK to the BMC */
BT_CONTROL(BT_CLR_RD_PTR); /* reset the queue */
i = read_all_bytes(bt);
BT_CONTROL(BT_H_BUSY); /* clear */
if (!i) break; /* Try this state again */
bt->state = BT_STATE_READ_END;
return SI_SM_CALL_WITHOUT_DELAY; /* for logging */
case BT_STATE_READ_END:
/* I could wait on BT_H_BUSY to go clear for a truly clean
exit. However, this is already done in XACTION_START
and the (possible) extra loop/status/possible wait affects
performance. So, as long as it works, just ignore H_BUSY */
#ifdef MAKE_THIS_TRUE_IF_NECESSARY
if (status & BT_H_BUSY) break;
#endif
bt->seq++;
bt->state = BT_STATE_IDLE;
return SI_SM_TRANSACTION_COMPLETE;
case BT_STATE_RESET1:
reset_flags(bt);
bt->timeout = BT_RESET_DELAY;
bt->state = BT_STATE_RESET2;
break;
case BT_STATE_RESET2: /* Send a soft reset */
BT_CONTROL(BT_CLR_WR_PTR);
HOST2BMC(3); /* number of bytes following */
HOST2BMC(0x18); /* NetFn/LUN == Application, LUN 0 */
HOST2BMC(42); /* Sequence number */
HOST2BMC(3); /* Cmd == Soft reset */
BT_CONTROL(BT_H2B_ATN);
bt->state = BT_STATE_RESET3;
break;
case BT_STATE_RESET3:
if (bt->timeout > 0) return SI_SM_CALL_WITH_DELAY;
bt->state = BT_STATE_RESTART; /* printk in debug modes */
break;
case BT_STATE_RESTART: /* don't reset retries! */
bt->write_data[2] = ++bt->seq;
bt->read_count = 0;
bt->nonzero_status = 0;
bt->timeout = BT_NORMAL_TIMEOUT;
bt->state = BT_STATE_XACTION_START;
break;
default: /* HOSED is supposed to be caught much earlier */
error_recovery(bt, "internal logic error");
break;
}
return SI_SM_CALL_WITH_DELAY;
}
/*
* Portions Copyright 2011 VMware, Inc.
*/
static int bt_detect(struct si_sm_data *bt)
{
/*
* It's impossible for the BT status and interrupt registers to be
* all 1's, (assuming a properly functioning, self-initialized BMC)
* but that's what you get from reading a bogus address, so we
* test that first. The calling routine uses negative logic.
*/
unsigned char bt_status = BT_STATUS;
unsigned char bt_intmask = BT_INTMASK_R;
if ((bt_status == 0xFF) || (bt_intmask == 0xFF)) {
if (bt_debug) {
printk(KERN_WARNING "IPMI BT: BT__STATUS or BT_MASK is invalid: %d, %d\n",
bt_status, bt_intmask);
}
return 1;
}
/*
* Test the R/W bits on the BT interface to ascertain if the device is
* truly available. These bits the host to device clear read bit and clear write
* bit, bit 0 and 1 on the BT_CNTL register and bit 7 the h/w reset bit of the
* BT_INTMASK register. The R/W bits should return 0 when read
*/
if (bt_status & (BT_CLR_WR_PTR | BT_CLR_RD_PTR)) {
if (bt_debug) {
printk(KERN_WARNING "IPMI BT: BT_CLR_WR_PTR or BT_CLR_RD_PTR are not 0: %d, %d\n",
(bt_status & BT_CLR_WR_PTR), (bt_status & BT_CLR_WR_PTR));
}
return 1;
}
if(bt_intmask & BT_BMC_HWRST) {
if (bt_debug) {
printk(KERN_WARNING "IPMI BT: BT_BMC_HWRST is not 0: %d\n",
(bt_intmask & BT_BMC_HWRST));
}
return 1;
}
/*
* The H_BUSY (bit 6) of the BT_CNTL register works as a toggle bit, with
* the state of the bit toggling if a 1 is written. No change is seen if 0 is
* written. This bit is toggled to further verify the presence of the BT interface
*/
// Toggle bit
BT_CONTROL(BT_H_BUSY);
if (!((bt_status ^ BT_STATUS) & BT_H_BUSY)) {
if (bt_debug) {
printk(KERN_WARNING "IPMI BT: Unable to toggle BT_H_BUSY once\n");
}
return 1;
}
//Toggle again
BT_CONTROL(BT_H_BUSY);
if ((bt_status ^ BT_STATUS) & BT_H_BUSY) {
if (bt_debug) {
printk(KERN_WARNING "IPMI BT: Unable to toggle BT_H_BUSY twice\n");
}
return 1;
}
reset_flags(bt);
return 0;
}
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
unsigned char status, BT_CAP[8];
static enum bt_states last_printed = BT_STATE_PRINTME;
int i;
status = BT_STATUS;
bt->nonzero_status |= status;
if ((bt_debug & BT_DEBUG_STATES) && (bt->state != last_printed)) {
printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
STATE2TXT,
STATUS2TXT,
bt->timeout,
time);
last_printed = bt->state;
}
/*
* Commands that time out may still (eventually) provide a response.
* This stale response will get in the way of a new response so remove
* it if possible (hopefully during IDLE). Even if it comes up later
* it will be rejected by its (now-forgotten) seq number.
*/
if ((bt->state < BT_STATE_WRITE_BYTES) && (status & BT_B2H_ATN)) {
drain_BMC2HOST(bt);
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
}
if ((bt->state != BT_STATE_IDLE) &&
(bt->state < BT_STATE_PRINTME)) {
/* check timeout */
bt->timeout -= time;
if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1))
return error_recovery(bt,
status,
IPMI_TIMEOUT_ERR);
}
switch (bt->state) {
/*
* Idle state first checks for asynchronous messages from another
* channel, then does some opportunistic housekeeping.
*/
case BT_STATE_IDLE:
if (status & BT_SMS_ATN) {
BT_CONTROL(BT_SMS_ATN); /* clear it */
return SI_SM_ATTN;
}
if (status & BT_H_BUSY) /* clear a leftover H_BUSY */
BT_CONTROL(BT_H_BUSY);
/* Read BT capabilities if it hasn't been done yet */
if (!bt->BT_CAP_outreqs)
BT_STATE_CHANGE(BT_STATE_CAPABILITIES_BEGIN,
SI_SM_CALL_WITHOUT_DELAY);
bt->timeout = bt->BT_CAP_req2rsp;
BT_SI_SM_RETURN(SI_SM_IDLE);
case BT_STATE_XACTION_START:
if (status & (BT_B_BUSY | BT_H2B_ATN))
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
if (BT_STATUS & BT_H_BUSY)
BT_CONTROL(BT_H_BUSY); /* force clear */
BT_STATE_CHANGE(BT_STATE_WRITE_BYTES,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_WRITE_BYTES:
if (status & BT_H_BUSY)
BT_CONTROL(BT_H_BUSY); /* clear */
BT_CONTROL(BT_CLR_WR_PTR);
write_all_bytes(bt);
BT_CONTROL(BT_H2B_ATN); /* can clear too fast to catch */
BT_STATE_CHANGE(BT_STATE_WRITE_CONSUME,
SI_SM_CALL_WITHOUT_DELAY);
case BT_STATE_WRITE_CONSUME:
if (status & (BT_B_BUSY | BT_H2B_ATN))
BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
BT_STATE_CHANGE(BT_STATE_READ