1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
33  * General purpose routines for the IEEE1284-1994 Standard
82 	ppb->error = PPB_NO_ERROR;  in ppb_1284_reset_error()
83 	ppb->state = state;  in ppb_1284_reset_error()
98 	mtx_assert(ppb->ppc_lock, MA_OWNED);  in ppb_1284_get_state()
99 	return (ppb->state);  in ppb_1284_get_state()
114 	mtx_assert(ppb->ppc_lock, MA_OWNED);  in ppb_1284_set_state()
115 	if ((ppb->state != PPB_ERROR) &&  in ppb_1284_set_state()
116 			(ppb->error == PPB_NO_ERROR)) {  in ppb_1284_set_state()
117 		ppb->state = state;  in ppb_1284_set_state()
118 		ppb->error = PPB_NO_ERROR;  in ppb_1284_set_state()
130 	if ((ppb->error == PPB_NO_ERROR) &&  in ppb_1284_set_error()
131 			(ppb->state != PPB_ERROR)) {  in ppb_1284_set_error()
132 		ppb->error = error;  in ppb_1284_set_error()
133 		ppb->state = PPB_ERROR;  in ppb_1284_set_error()
209 	while (spin-- && (ppb_rstr(bus) & nBUSY))  in ppb_peripheral_negociate()
210 		DELAY(1);  in ppb_peripheral_negociate()
218 	/* Event 4 - read ext. value */  in ppb_peripheral_negociate()
224 		/* Event 5 - restore direction bit, no data avail */  in ppb_peripheral_negociate()
226 		DELAY(1);  in ppb_peripheral_negociate()
253 		/* Event 5 - mode not supported */  in ppb_peripheral_negociate()
255 		DELAY(1);  in ppb_peripheral_negociate()
293 	/* Event 22 - wait up to host response time (1s) */  in ppb_peripheral_terminate()
302 	/* Event 25 - wait up to host response time (1s) */  in ppb_peripheral_terminate()
310 	DELAY(1);  in ppb_peripheral_terminate()
314 	/* Event 28 - wait up to host response time (1s) */  in ppb_peripheral_terminate()
349 	/* Event 15 - put byte on data lines */  in byte_peripheral_outbyte()
358 	/* Event 10 - wait data read */  in byte_peripheral_outbyte()
372 	/* Event 16 - wait strobe */  in byte_peripheral_outbyte()
425 		if ((error = byte_peripheral_outbyte(bus, buffer+i, (i == len-1))))  in byte_peripheral_write()
439  * Read 1 byte in BYTE mode
446 	/* Event 7 - ready to take data (nAUTO low) */  in byte_1284_inbyte()
449 	/* Event 9 - peripheral set nAck low */  in byte_1284_inbyte()
455 	/* read the byte */  in byte_1284_inbyte()
458 	/* Event 10 - data received, can't accept more */  in byte_1284_inbyte()
461 	/* Event 11 - peripheral ack */  in byte_1284_inbyte()
467 	/* Event 16 - strobe */  in byte_1284_inbyte()
469 	DELAY(3);  in byte_1284_inbyte()
479  * Read 1 byte in NIBBLE mode
488 		/* Event 7 - ready to take data (nAUTO low) */  in nibble_1284_inbyte()
491 		/* Event 8 - peripheral writes the first nibble */  in nibble_1284_inbyte()
493 		/* Event 9 - peripheral set nAck low */  in nibble_1284_inbyte()
499 		/* read nibble */  in nibble_1284_inbyte()
502 		/* Event 10 - ack, nibble received */  in nibble_1284_inbyte()
505 		/* Event 11 - wait ack from peripherial */  in nibble_1284_inbyte()
522  * Read in IEEE1284 NIBBLE/BYTE mode
525 spp_1284_read(device_t bus, int mode, char *buffer, int max, int *read)  in spp_1284_read()  argument
531 	*read = len = 0;  in spp_1284_read()
561 			/* read a byte, error means no more data */  in spp_1284_read()
580 	*read = len;  in spp_1284_read()
594 		int max, int *read)  in ppb_1284_read_id()  argument
606 		error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read);  in ppb_1284_read_id()
611 		error = spp_1284_read(bus, PPB_BYTE, buffer, max, read);  in ppb_1284_read_id()
624  * IEEE1284 read
628 		int max, int *read)  in ppb_1284_read()  argument
635 		error = spp_1284_read(bus, mode, buffer, max, read);  in ppb_1284_read()
684 	DELAY(1);  in ppb_1284_negociate()
689 	/* Event 0 - put the exten. value on the data lines */  in ppb_1284_negociate()
695 	DELAY(1);  in ppb_1284_negociate()
698 	DELAY(1);  in ppb_1284_negociate()
702 	/* Event 1 - enter IEEE1284 mode */  in ppb_1284_negociate()
715 	/* Event 2 - trying IEEE1284 dialog */  in ppb_1284_negociate()
724 	/* Event 3 - latch the ext. value to the peripheral */  in ppb_1284_negociate()
726 	DELAY(1);  in ppb_1284_negociate()
728 	/* Event 4 - IEEE1284 device recognized */  in ppb_1284_negociate()
731 	/* Event 6 - waiting for status lines */  in ppb_1284_negociate()
738 	/* Event 7 - querying result consider nACK not to misunderstand  in ppb_1284_negociate()
828 	DELAY(1);  in ppb_1284_terminate()
831 	/* Event 22 - set nSelectin low and nAutoFeed high */  in ppb_1284_terminate()
834 	/* Event 24 - waiting for peripheral, Xflag ignored */  in ppb_1284_terminate()
840 	/* Event 25 - set nAutoFd low */  in ppb_1284_terminate()
843 	/* Event 26 - compatible mode status is set */  in ppb_1284_terminate()
845 	/* Event 27 - peripheral set nAck high */  in ppb_1284_terminate()
850 	/* Event 28 - end termination, return to idle phase */  in ppb_1284_terminate()