1 // SPDX-License-Identifier: GPL-2.0
2 /* IEEE-1284 operations for parport.
5  * they are used by the low-level drivers.  If they have a special way
7  * the function pointers in port->ops); if not, they can just use these
13  * Fixed AUTOFD polarity in ecp_forward_to_reverse().  Fred Barnes, 1999
31  * One-way data transfer functions. *
43 	struct pardevice *dev = port->physport->cad;  in parport_ieee1284_write_compat()
47 	if (port->irq != PARPORT_IRQ_NONE) {  in parport_ieee1284_write_compat()
52 	port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;  in parport_ieee1284_write_compat()
56 		unsigned long expire = jiffies + dev->timeout;  in parport_ieee1284_write_compat()
112 		pr_debug("%s: Timed out\n", port->name);  in parport_ieee1284_write_compat()
121 		/* Pulse strobe. */  in parport_ieee1284_write_compat()
123 		udelay (1); /* strobe */  in parport_ieee1284_write_compat()
138 	port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;  in parport_ieee1284_write_compat()
171 		port->ieee1284.phase = IEEE1284_PH_REV_DATA;  in parport_ieee1284_read_nibble()
174 			/* Timeout -- no more data? */  in parport_ieee1284_read_nibble()
176 				 port->name, i / 2);  in parport_ieee1284_read_nibble()
189 		/* Event 10: Set nAutoFd high. */  in parport_ieee1284_read_nibble()
192 		/* Event 11: nAck goes high. */  in parport_ieee1284_read_nibble()
196 			/* Timeout -- no more data? */  in parport_ieee1284_read_nibble()
198 				 port->name);  in parport_ieee1284_read_nibble()
215 				 port->name, i / 2);  in parport_ieee1284_read_nibble()
221 			port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;  in parport_ieee1284_read_nibble()
224 			port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;  in parport_ieee1284_read_nibble()
250 		/* Event 14: Place data bus in high impedance state. */  in parport_ieee1284_read_byte()
259 		port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA;  in parport_ieee1284_read_byte()
263 			/* Timeout -- no more data? */  in parport_ieee1284_read_byte()
266 			pr_debug("%s: Byte timeout at event 9\n", port->name);  in parport_ieee1284_read_byte()
273 		/* Event 10: Set nAutoFd high */  in parport_ieee1284_read_byte()
276 		/* Event 11: nAck goes high. */  in parport_ieee1284_read_byte()
280 			/* Timeout -- no more data? */  in parport_ieee1284_read_byte()
281 			pr_debug("%s: Byte timeout at event 11\n", port->name);  in parport_ieee1284_read_byte()
291 		/* Event 17: Set nStrobe high. */  in parport_ieee1284_read_byte()
300 				 port->name, count);  in parport_ieee1284_read_byte()
306 			port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;  in parport_ieee1284_read_byte()
309 			port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;  in parport_ieee1284_read_byte()
344 		pr_debug("%s: ECP direction: reverse\n", port->name);  in ecp_forward_to_reverse()
345 		port->ieee1284.phase = IEEE1284_PH_REV_IDLE;  in ecp_forward_to_reverse()
347 		pr_debug("%s: ECP direction: failed to reverse\n", port->name);  in ecp_forward_to_reverse()
348 		port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;  in ecp_forward_to_reverse()
359 	/* Event 47: Set nInit high */  in ecp_reverse_to_forward()
366 	/* Event 49: PError goes high */  in ecp_reverse_to_forward()
373 		pr_debug("%s: ECP direction: forward\n", port->name);  in ecp_reverse_to_forward()
374 		port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;  in ecp_reverse_to_forward()
377 			 port->name);  in ecp_reverse_to_forward()
378 		port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;  in ecp_reverse_to_forward()
399 	port = port->physport;  in parport_ieee1284_ecp_write_data()
401 	if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)  in parport_ieee1284_ecp_write_data()
405 	port->ieee1284.phase = IEEE1284_PH_FWD_DATA;  in parport_ieee1284_ecp_write_data()
407 	/* HostAck high (data, not command) */  in parport_ieee1284_ecp_write_data()
414 		unsigned long expire = jiffies + port->cad->timeout;  in parport_ieee1284_ecp_write_data()
437 		pr_debug("%s: ECP transfer stalled!\n", port->name);  in parport_ieee1284_ecp_write_data()
453 		pr_debug("%s: Host transfer recovered\n", port->name);  in parport_ieee1284_ecp_write_data()
467 	port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;  in parport_ieee1284_ecp_write_data()
480 	struct pardevice *dev = port->cad;  in parport_ieee1284_ecp_read_data()
487 	port = port->physport;  in parport_ieee1284_ecp_read_data()
489 	if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE)  in parport_ieee1284_ecp_read_data()
493 	port->ieee1284.phase = IEEE1284_PH_REV_DATA;  in parport_ieee1284_ecp_read_data()
502 		unsigned long expire = jiffies + dev->timeout;  in parport_ieee1284_ecp_read_data()
521 			if (count && dev->port->irq != PARPORT_IRQ_NONE) {  in parport_ieee1284_ecp_read_data()
537 			/* The last byte was a run-length count, so  in parport_ieee1284_ecp_read_data()
552 					 port->name, byte);  in parport_ieee1284_ecp_read_data()
555 			else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)  in parport_ieee1284_ecp_read_data()
557 					 port->name);  in parport_ieee1284_ecp_read_data()
562 			if (rle_count > (len - count)) {  in parport_ieee1284_ecp_read_data()
564 					 port->name, rle_count);  in parport_ieee1284_ecp_read_data()
571 		/* Event 44: Set HostAck high, acknowledging handshake. */  in parport_ieee1284_ecp_read_data()
574 		/* Event 45: The peripheral has 35ms to set nAck high. */  in parport_ieee1284_ecp_read_data()
583 					port->name, byte);  in parport_ieee1284_ecp_read_data()
592 		/* If we just read a run-length count, fetch the data. */  in parport_ieee1284_ecp_read_data()
596 		/* If this is the byte after a run-length count, decompress. */  in parport_ieee1284_ecp_read_data()
603 				 port->name, rle_count);  in parport_ieee1284_ecp_read_data()
612 	port->ieee1284.phase = IEEE1284_PH_REV_IDLE;  in parport_ieee1284_ecp_read_data()
629 	port = port->physport;  in parport_ieee1284_ecp_write_addr()
631 	if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)  in parport_ieee1284_ecp_write_addr()
635 	port->ieee1284.phase = IEEE1284_PH_FWD_DATA;  in parport_ieee1284_ecp_write_addr()
645 		unsigned long expire = jiffies + port->cad->timeout;  in parport_ieee1284_ecp_write_addr()
668 		pr_debug("%s: ECP transfer stalled!\n", port->name);  in parport_ieee1284_ecp_write_addr()
684 		pr_debug("%s: Host transfer recovered\n", port->name);  in parport_ieee1284_ecp_write_addr()
698 	port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;  in parport_ieee1284_ecp_write_addr()
716 	/* set EPP idle state (just to make sure) with strobe low */  in parport_ieee1284_epp_write_data()
724 	port->ops->data_forward (port);  in parport_ieee1284_epp_write_data()
725 	for (; len > 0; len--, bp++) {  in parport_ieee1284_epp_write_data()
731 		/* Event 58: wait for busy (nWait) to go high */  in parport_ieee1284_epp_write_data()
735 		/* Event 63: set nAutoFd (nDStrb) high */  in parport_ieee1284_epp_write_data()
746 	/* Event 61: set strobe (nWrite) high */  in parport_ieee1284_epp_write_data()
760 	/* set EPP idle state (just to make sure) with strobe high */  in parport_ieee1284_epp_read_data()
767 	port->ops->data_reverse (port);  in parport_ieee1284_epp_read_data()
768 	for (; len > 0; len--, bp++) {  in parport_ieee1284_epp_read_data()
773 		/* Event 58: wait for Busy to go high */  in parport_ieee1284_epp_read_data()
780 		/* Event 63: set nAutoFd (nDStrb) high */  in parport_ieee1284_epp_read_data()
791 	port->ops->data_forward (port);  in parport_ieee1284_epp_read_data()
804 	/* set EPP idle state (just to make sure) with strobe low */  in parport_ieee1284_epp_write_addr()
812 	port->ops->data_forward (port);  in parport_ieee1284_epp_write_addr()
813 	for (; len > 0; len--, bp++) {  in parport_ieee1284_epp_write_addr()
819 		/* Event 58: wait for busy (nWait) to go high */  in parport_ieee1284_epp_write_addr()
823 		/* Event 59: set nAStrb high */  in parport_ieee1284_epp_write_addr()
834 	/* Event 61: set strobe (nWrite) high */  in parport_ieee1284_epp_write_addr()
848 	/* Set EPP idle state (just to make sure) with strobe high */  in parport_ieee1284_epp_read_addr()
855 	port->ops->data_reverse (port);  in parport_ieee1284_epp_read_addr()
856 	for (; len > 0; len--, bp++) {  in parport_ieee1284_epp_read_addr()
861 		/* Event 58: wait for Busy to go high */  in parport_ieee1284_epp_read_addr()
868 		/* Event 59: set nSelectIn (nAStrb) high */  in parport_ieee1284_epp_read_addr()
879 	port->ops->data_forward (port);  in parport_ieee1284_epp_read_addr()