Lines Matching +full:reverse +full:- +full:data
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
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()
116 /* Write the character to the data lines. */ in parport_ieee1284_write_compat()
138 port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE; in parport_ieee1284_write_compat()
159 /* Does the error line indicate end of data? */ in parport_ieee1284_read_nibble()
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()
196 /* Timeout -- no more data? */ in parport_ieee1284_read_nibble()
198 port->name); in parport_ieee1284_read_nibble()
211 /* Read the last nibble without checking data avail. */ in parport_ieee1284_read_nibble()
214 pr_debug("%s: No more nibble data (%d bytes)\n", in parport_ieee1284_read_nibble()
215 port->name, i / 2); in parport_ieee1284_read_nibble()
217 /* Go to reverse idle phase. */ 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()
245 /* Data available? */ in parport_ieee1284_read_byte()
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()
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()
296 /* Read the last byte without checking data avail. */ in parport_ieee1284_read_byte()
299 pr_debug("%s: No more byte data (%zd bytes)\n", in parport_ieee1284_read_byte()
300 port->name, count); in parport_ieee1284_read_byte()
302 /* Go to reverse idle phase. */ 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()
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()
387 /* ECP mode, forward channel, data. */
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()
463 /* Peripheral hasn't accepted the data. */ in parport_ieee1284_ecp_write_data()
467 port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; in parport_ieee1284_ecp_write_data()
473 /* ECP mode, reverse channel, 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()
495 /* Set HostAck low to start accepting data. */ in parport_ieee1284_ecp_read_data()
502 unsigned long expire = jiffies + dev->timeout; in parport_ieee1284_ecp_read_data()
509 /* The peripheral hasn't given us data in in parport_ieee1284_ecp_read_data()
510 35ms. If we have data to give back to the in parport_ieee1284_ecp_read_data()
521 if (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()
544 /* Read the data. */ in parport_ieee1284_ecp_read_data()
548 command or a normal data byte, don't accept it. */ 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()
577 /* It's gone wrong. Return what data we have in parport_ieee1284_ecp_read_data()
583 port->name, byte); in parport_ieee1284_ecp_read_data()
588 /* Event 46: Set HostAck low and accept the data. */ 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()
605 /* Normal data byte. */ 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()
637 /* HostAck low (command, not 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()
694 /* Peripheral hasn't accepted the data. */ in parport_ieee1284_ecp_write_addr()
698 port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; in parport_ieee1284_ecp_write_addr()
708 /* EPP mode, forward channel, 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()
726 /* Event 62: Write data and set autofd low */ in parport_ieee1284_epp_write_data()
752 /* EPP mode, reverse channel, 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()
791 port->ops->data_forward (port); in parport_ieee1284_epp_read_data()
812 port->ops->data_forward (port); in parport_ieee1284_epp_write_addr()
813 for (; len > 0; len--, bp++) { in parport_ieee1284_epp_write_addr()
814 /* Event 56: Write data and set nAStrb low. */ in parport_ieee1284_epp_write_addr()
840 /* EPP mode, reverse channel, addresses. */
855 port->ops->data_reverse (port); in parport_ieee1284_epp_read_addr()
856 for (; len > 0; len--, bp++) { in parport_ieee1284_epp_read_addr()
879 port->ops->data_forward (port); in parport_ieee1284_epp_read_addr()