72 #define BT_STATE_CHANGE(X, Y) { bt->state = X; return Y; }
110 #define BT_STATUS	bt->io->inputb(bt->io, 0)
111 #define BT_CONTROL(x)	bt->io->outputb(bt->io, 0, x)
113 #define BMC2HOST	bt->io->inputb(bt->io, 1)
114 #define HOST2BMC(x)	bt->io->outputb(bt->io, 1, x)
116 #define BT_INTMASK_R	bt->io->inputb(bt->io, 2)
117 #define BT_INTMASK_W(x)	bt->io->outputb(bt->io, 2, x)
142 #define STATE2TXT state2txt(bt->state)
173 static unsigned int bt_init_data(struct si_sm_data *bt, struct si_sm_io *io)  in bt_init_data()  argument
175 	memset(bt, 0, sizeof(struct si_sm_data));  in bt_init_data()
176 	if (bt->io != io) {  in bt_init_data()
178 		bt->io = io;  in bt_init_data()
179 		bt->seq = 0;  in bt_init_data()
181 	bt->state = BT_STATE_IDLE;	/* start here */  in bt_init_data()
182 	bt->complete = BT_STATE_IDLE;	/* end here */  in bt_init_data()
183 	bt->BT_CAP_req2rsp = BT_NORMAL_TIMEOUT * USEC_PER_SEC;  in bt_init_data()
184 	bt->BT_CAP_retries = BT_NORMAL_RETRY_LIMIT;  in bt_init_data()
190 static void force_result(struct si_sm_data *bt, unsigned char completion_code)  in force_result()  argument
192 	bt->read_data[0] = 4;				/* # following bytes */  in force_result()
193 	bt->read_data[1] = bt->write_data[1] | 4;	/* Odd NetFn/LUN */  in force_result()
194 	bt->read_data[2] = bt->write_data[2];		/* seq (ignored) */  in force_result()
195 	bt->read_data[3] = bt->write_data[3];		/* Command */  in force_result()
196 	bt->read_data[4] = completion_code;  in force_result()
197 	bt->read_count = 5;  in force_result()
202 static int bt_start_transaction(struct si_sm_data *bt,  in bt_start_transaction()  argument
213 	if (bt->state == BT_STATE_LONG_BUSY)  in bt_start_transaction()
216 	if (bt->state != BT_STATE_IDLE)  in bt_start_transaction()
220 		dev_dbg(bt->io->dev, "+++++++++++++++++ New command\n");  in bt_start_transaction()
221 		dev_dbg(bt->io->dev, "NetFn/LUN CMD [%d data]:", size - 2);  in bt_start_transaction()
226 	bt->write_data[0] = size + 1;	/* all data plus seq byte */  in bt_start_transaction()
227 	bt->write_data[1] = *data;	/* NetFn/LUN */  in bt_start_transaction()
228 	bt->write_data[2] = bt->seq++;  in bt_start_transaction()
229 	memcpy(bt->write_data + 3, data + 1, size - 1);  in bt_start_transaction()
230 	bt->write_count = size + 2;  in bt_start_transaction()
231 	bt->error_retries = 0;  in bt_start_transaction()
232 	bt->nonzero_status = 0;  in bt_start_transaction()
233 	bt->truncated = 0;  in bt_start_transaction()
234 	bt->state = BT_STATE_XACTION_START;  in bt_start_transaction()
235 	bt->timeout = bt->BT_CAP_req2rsp;  in bt_start_transaction()
236 	force_result(bt, IPMI_ERR_UNSPECIFIED);  in bt_start_transaction()
245 static int bt_get_result(struct si_sm_data *bt,  in bt_get_result()  argument
251 	msg_len = bt->read_count - 2;		/* account for length & seq */  in bt_get_result()
253 		force_result(bt, IPMI_ERR_UNSPECIFIED);  in bt_get_result()
256 	data[0] = bt->read_data[1];  in bt_get_result()
257 	data[1] = bt->read_data[3];  in bt_get_result()
258 	if (length < msg_len || bt->truncated) {  in bt_get_result()
262 		memcpy(data + 2, bt->read_data + 4, msg_len - 2);  in bt_get_result()
265 		dev_dbg(bt->io->dev, "result %d bytes:", msg_len);  in bt_get_result()
276 static void reset_flags(struct si_sm_data *bt)  in reset_flags()  argument
279 		dev_dbg(bt->io->dev, "flag reset %s\n", status2txt(BT_STATUS));  in reset_flags()
292 static void drain_BMC2HOST(struct si_sm_data *bt)  in drain_BMC2HOST()  argument
305 		dev_dbg(bt->io->dev, "stale response %s; ",  in drain_BMC2HOST()
315 static inline void write_all_bytes(struct si_sm_data *bt)  in write_all_bytes()  argument
320 		dev_dbg(bt->io->dev, "write %d bytes seq=0x%02X",  in write_all_bytes()
321 			bt->write_count, bt->seq);  in write_all_bytes()
322 		for (i = 0; i < bt->write_count; i++)  in write_all_bytes()
323 			pr_cont(" %02x", bt->write_data[i]);  in write_all_bytes()
326 	for (i = 0; i < bt->write_count; i++)  in write_all_bytes()
327 		HOST2BMC(bt->write_data[i]);  in write_all_bytes()
330 static inline int read_all_bytes(struct si_sm_data *bt)  in read_all_bytes()  argument
339 	bt->read_data[0] = BMC2HOST;  in read_all_bytes()
340 	bt->read_count = bt->read_data[0];  in read_all_bytes()
342 	if (bt->read_count < 4 || bt->read_count >= IPMI_MAX_MSG_LENGTH) {  in read_all_bytes()
344 			dev_dbg(bt->io->dev,  in read_all_bytes()
345 				"bad raw rsp len=%d\n", bt->read_count);  in read_all_bytes()
346 		bt->truncated = 1;  in read_all_bytes()
349 	for (i = 1; i <= bt->read_count; i++)  in read_all_bytes()
350 		bt->read_data[i] = BMC2HOST;  in read_all_bytes()
351 	bt->read_count++;	/* Account internally for length byte */  in read_all_bytes()
354 		int max = bt->read_count;  in read_all_bytes()
356 		dev_dbg(bt->io->dev,  in read_all_bytes()
357 			"got %d bytes seq=0x%02X", max, bt->read_data[2]);  in read_all_bytes()
361 			pr_cont(" %02x", bt->read_data[i]);  in read_all_bytes()
362 		pr_cont("%s\n", bt->read_count == max ? "" : " ...");  in read_all_bytes()
366 	if ((bt->read_data[3] == bt->write_data[3]) &&  in read_all_bytes()
367 	    (bt->read_data[2] == bt->write_data[2]) &&  in read_all_bytes()
368 	    ((bt->read_data[1] & 0xF8) == (bt->write_data[1] & 0xF8)))  in read_all_bytes()
372 		dev_dbg(bt->io->dev,  in read_all_bytes()
374 			bt->write_data[1] | 0x04, bt->write_data[2],  in read_all_bytes()
375 			bt->write_data[3],  in read_all_bytes()
376 			bt->read_data[1],  bt->read_data[2],  bt->read_data[3]);  in read_all_bytes()
382 static enum si_sm_result error_recovery(struct si_sm_data *bt,  in error_recovery()  argument
388 	bt->timeout = bt->BT_CAP_req2rsp;  in error_recovery()
399 	dev_warn(bt->io->dev, "IPMI BT: %s in %s %s ", /* open-ended line */  in error_recovery()
406 	(bt->error_retries)++;  in error_recovery()
407 	if (bt->error_retries < bt->BT_CAP_retries) {  in error_recovery()
409 			bt->BT_CAP_retries - bt->error_retries);  in error_recovery()
410 		bt->state = BT_STATE_RESTART;  in error_recovery()
414 	dev_warn(bt->io->dev, "failed %d retries, sending error response\n",  in error_recovery()
415 		 bt->BT_CAP_retries);  in error_recovery()
416 	if (!bt->nonzero_status)  in error_recovery()
417 		dev_err(bt->io->dev, "stuck, try power cycle\n");  in error_recovery()
420 	else if (bt->seq <= (unsigned char)(bt->BT_CAP_retries & 0xFF)) {  in error_recovery()
421 		dev_warn(bt->io->dev, "BT reset (takes 5 secs)\n");  in error_recovery()
422 		bt->state = BT_STATE_RESET1;  in error_recovery()
431 	bt->state = BT_STATE_IDLE;  in error_recovery()
436 			bt->state = BT_STATE_LONG_BUSY;  in error_recovery()
442 	force_result(bt, cCode);  in error_recovery()
448 static enum si_sm_result bt_event(struct si_sm_data *bt, long time)  in bt_event()  argument
455 	bt->nonzero_status |= status;  in bt_event()
456 	if ((bt_debug & BT_DEBUG_STATES) && (bt->state != last_printed)) {  in bt_event()
457 		dev_dbg(bt->io->dev, "BT: %s %s TO=%ld - %ld\n",  in bt_event()
460 			bt->timeout,  in bt_event()
462 		last_printed = bt->state;  in bt_event()
472 	if ((bt->state < BT_STATE_WRITE_BYTES) && (status & BT_B2H_ATN)) {  in bt_event()
473 		drain_BMC2HOST(bt);  in bt_event()
477 	if ((bt->state != BT_STATE_IDLE) &&  in bt_event()
478 	    (bt->state <  BT_STATE_PRINTME)) {  in bt_event()
480 		bt->timeout -= time;  in bt_event()
481 		if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1))  in bt_event()
482 			return error_recovery(bt,  in bt_event()
487 	switch (bt->state) {  in bt_event()
517 		write_all_bytes(bt);  in bt_event()
559 		i = read_all_bytes(bt);		/* true == packet seq match */  in bt_event()
564 		bt->state = bt->complete;  in bt_event()
565 		return bt->state == BT_STATE_IDLE ?	/* where to next? */  in bt_event()
571 			reset_flags(bt);	/* next state is now IDLE */  in bt_event()
572 			bt_init_data(bt, bt->io);  in bt_event()
577 		reset_flags(bt);  in bt_event()
578 		drain_BMC2HOST(bt);  in bt_event()
589 		bt->timeout = BT_RESET_DELAY * USEC_PER_SEC;  in bt_event()
594 		if (bt->timeout > 0)  in bt_event()
596 		drain_BMC2HOST(bt);  in bt_event()
601 		bt->read_count = 0;  in bt_event()
602 		bt->nonzero_status = 0;  in bt_event()
603 		bt->timeout = bt->BT_CAP_req2rsp;  in bt_event()
608 		return error_recovery(bt,  in bt_event()
615 static int bt_detect(struct si_sm_data *bt)  in bt_detect()  argument
631 	reset_flags(bt);  in bt_detect()
636 	rv = bt_start_transaction(bt, GetBT_CAP, sizeof(GetBT_CAP));  in bt_detect()
638 		dev_warn(bt->io->dev,  in bt_detect()
648 			smi_result = bt_event(bt, jiffies_to_usecs(1));  in bt_detect()
650 			smi_result = bt_event(bt, 0);  in bt_detect()
655 	rv = bt_get_result(bt, BT_CAP, sizeof(BT_CAP));  in bt_detect()
656 	bt_init_data(bt, bt->io);  in bt_detect()
658 		dev_warn(bt->io->dev, "bt cap response too short: %d\n", rv);  in bt_detect()
663 		dev_warn(bt->io->dev, "Error fetching bt cap: %x\n", BT_CAP[2]);  in bt_detect()
665 		dev_warn(bt->io->dev, "using default values\n");  in bt_detect()
667 		bt->BT_CAP_req2rsp = BT_CAP[6] * USEC_PER_SEC;  in bt_detect()
668 		bt->BT_CAP_retries = BT_CAP[7];  in bt_detect()
671 	dev_info(bt->io->dev, "req2rsp=%ld secs retries=%d\n",  in bt_detect()
672 		 bt->BT_CAP_req2rsp / USEC_PER_SEC, bt->BT_CAP_retries);  in bt_detect()
677 static void bt_cleanup(struct si_sm_data *bt)  in bt_cleanup()  argument