109c434b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
21da177e4SLinus Torvalds /* Low-level parallel port routines for the Amiga built-in port
31da177e4SLinus Torvalds *
41da177e4SLinus Torvalds * Author: Joerg Dorchain <joerg@dorchain.net>
51da177e4SLinus Torvalds *
61da177e4SLinus Torvalds * This is a complete rewrite of the code, but based heaviy upon the old
71da177e4SLinus Torvalds * lp_intern. code.
81da177e4SLinus Torvalds *
91da177e4SLinus Torvalds * The built-in Amiga parallel port provides one port at a fixed address
101da177e4SLinus Torvalds * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
111da177e4SLinus Torvalds * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
121da177e4SLinus Torvalds * in hardware when the data register is accessed), and 1 input control line
131da177e4SLinus Torvalds * /ACK, able to cause an interrupt, but both not directly settable by
141da177e4SLinus Torvalds * software.
151da177e4SLinus Torvalds */
161da177e4SLinus Torvalds
171da177e4SLinus Torvalds #include <linux/module.h>
181da177e4SLinus Torvalds #include <linux/init.h>
191da177e4SLinus Torvalds #include <linux/parport.h>
201da177e4SLinus Torvalds #include <linux/ioport.h>
211da177e4SLinus Torvalds #include <linux/interrupt.h>
226f8221c2SGeert Uytterhoeven #include <linux/platform_device.h>
236f8221c2SGeert Uytterhoeven
241da177e4SLinus Torvalds #include <asm/setup.h>
251da177e4SLinus Torvalds #include <asm/amigahw.h>
261da177e4SLinus Torvalds #include <asm/irq.h>
271da177e4SLinus Torvalds #include <asm/io.h>
281da177e4SLinus Torvalds #include <asm/amigaints.h>
291da177e4SLinus Torvalds
301da177e4SLinus Torvalds #undef DEBUG
311da177e4SLinus Torvalds
amiga_write_data(struct parport * p,unsigned char data)321da177e4SLinus Torvalds static void amiga_write_data(struct parport *p, unsigned char data)
331da177e4SLinus Torvalds {
3445a272bcSJoe Perches pr_debug("write_data %c\n", data);
351da177e4SLinus Torvalds /* Triggers also /STROBE. This behavior cannot be changed */
361da177e4SLinus Torvalds ciaa.prb = data;
371da177e4SLinus Torvalds mb();
381da177e4SLinus Torvalds }
391da177e4SLinus Torvalds
amiga_read_data(struct parport * p)401da177e4SLinus Torvalds static unsigned char amiga_read_data(struct parport *p)
411da177e4SLinus Torvalds {
421da177e4SLinus Torvalds /* Triggers also /STROBE. This behavior cannot be changed */
431da177e4SLinus Torvalds return ciaa.prb;
441da177e4SLinus Torvalds }
451da177e4SLinus Torvalds
control_amiga_to_pc(unsigned char control)461da177e4SLinus Torvalds static unsigned char control_amiga_to_pc(unsigned char control)
471da177e4SLinus Torvalds {
481da177e4SLinus Torvalds return PARPORT_CONTROL_SELECT |
491da177e4SLinus Torvalds PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
501da177e4SLinus Torvalds /* fake value: interrupt enable, select in, no reset,
511da177e4SLinus Torvalds no autolf, no strobe - seems to be closest the wiring diagram */
521da177e4SLinus Torvalds }
531da177e4SLinus Torvalds
amiga_write_control(struct parport * p,unsigned char control)541da177e4SLinus Torvalds static void amiga_write_control(struct parport *p, unsigned char control)
551da177e4SLinus Torvalds {
5645a272bcSJoe Perches pr_debug("write_control %02x\n", control);
571da177e4SLinus Torvalds /* No implementation possible */
581da177e4SLinus Torvalds }
591da177e4SLinus Torvalds
amiga_read_control(struct parport * p)601da177e4SLinus Torvalds static unsigned char amiga_read_control( struct parport *p)
611da177e4SLinus Torvalds {
6245a272bcSJoe Perches pr_debug("read_control\n");
631da177e4SLinus Torvalds return control_amiga_to_pc(0);
641da177e4SLinus Torvalds }
651da177e4SLinus Torvalds
amiga_frob_control(struct parport * p,unsigned char mask,unsigned char val)661da177e4SLinus Torvalds static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
671da177e4SLinus Torvalds {
681da177e4SLinus Torvalds unsigned char old;
691da177e4SLinus Torvalds
7045a272bcSJoe Perches pr_debug("frob_control mask %02x, value %02x\n", mask, val);
711da177e4SLinus Torvalds old = amiga_read_control(p);
721da177e4SLinus Torvalds amiga_write_control(p, (old & ~mask) ^ val);
731da177e4SLinus Torvalds return old;
741da177e4SLinus Torvalds }
751da177e4SLinus Torvalds
status_amiga_to_pc(unsigned char status)761da177e4SLinus Torvalds static unsigned char status_amiga_to_pc(unsigned char status)
771da177e4SLinus Torvalds {
781da177e4SLinus Torvalds unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
791da177e4SLinus Torvalds
801da177e4SLinus Torvalds if (status & 1) /* Busy */
811da177e4SLinus Torvalds ret &= ~PARPORT_STATUS_BUSY;
821da177e4SLinus Torvalds if (status & 2) /* PaperOut */
831da177e4SLinus Torvalds ret |= PARPORT_STATUS_PAPEROUT;
841da177e4SLinus Torvalds if (status & 4) /* Selected */
851da177e4SLinus Torvalds ret |= PARPORT_STATUS_SELECT;
861da177e4SLinus Torvalds /* the rest is not connected or handled autonomously in hardware */
871da177e4SLinus Torvalds
881da177e4SLinus Torvalds return ret;
891da177e4SLinus Torvalds }
901da177e4SLinus Torvalds
amiga_read_status(struct parport * p)911da177e4SLinus Torvalds static unsigned char amiga_read_status(struct parport *p)
921da177e4SLinus Torvalds {
931da177e4SLinus Torvalds unsigned char status;
941da177e4SLinus Torvalds
951da177e4SLinus Torvalds status = status_amiga_to_pc(ciab.pra & 7);
9645a272bcSJoe Perches pr_debug("read_status %02x\n", status);
971da177e4SLinus Torvalds return status;
981da177e4SLinus Torvalds }
991da177e4SLinus Torvalds
amiga_enable_irq(struct parport * p)1001da177e4SLinus Torvalds static void amiga_enable_irq(struct parport *p)
1011da177e4SLinus Torvalds {
1021da177e4SLinus Torvalds enable_irq(IRQ_AMIGA_CIAA_FLG);
1031da177e4SLinus Torvalds }
1041da177e4SLinus Torvalds
amiga_disable_irq(struct parport * p)1051da177e4SLinus Torvalds static void amiga_disable_irq(struct parport *p)
1061da177e4SLinus Torvalds {
1071da177e4SLinus Torvalds disable_irq(IRQ_AMIGA_CIAA_FLG);
1081da177e4SLinus Torvalds }
1091da177e4SLinus Torvalds
amiga_data_forward(struct parport * p)1101da177e4SLinus Torvalds static void amiga_data_forward(struct parport *p)
1111da177e4SLinus Torvalds {
11245a272bcSJoe Perches pr_debug("forward\n");
1131da177e4SLinus Torvalds ciaa.ddrb = 0xff; /* all pins output */
1141da177e4SLinus Torvalds mb();
1151da177e4SLinus Torvalds }
1161da177e4SLinus Torvalds
amiga_data_reverse(struct parport * p)1171da177e4SLinus Torvalds static void amiga_data_reverse(struct parport *p)
1181da177e4SLinus Torvalds {
11945a272bcSJoe Perches pr_debug("reverse\n");
1201da177e4SLinus Torvalds ciaa.ddrb = 0; /* all pins input */
1211da177e4SLinus Torvalds mb();
1221da177e4SLinus Torvalds }
1231da177e4SLinus Torvalds
amiga_init_state(struct pardevice * dev,struct parport_state * s)1241da177e4SLinus Torvalds static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
1251da177e4SLinus Torvalds {
1261da177e4SLinus Torvalds s->u.amiga.data = 0;
1271da177e4SLinus Torvalds s->u.amiga.datadir = 255;
1281da177e4SLinus Torvalds s->u.amiga.status = 0;
1291da177e4SLinus Torvalds s->u.amiga.statusdir = 0;
1301da177e4SLinus Torvalds }
1311da177e4SLinus Torvalds
amiga_save_state(struct parport * p,struct parport_state * s)1321da177e4SLinus Torvalds static void amiga_save_state(struct parport *p, struct parport_state *s)
1331da177e4SLinus Torvalds {
1341da177e4SLinus Torvalds mb();
1351da177e4SLinus Torvalds s->u.amiga.data = ciaa.prb;
1361da177e4SLinus Torvalds s->u.amiga.datadir = ciaa.ddrb;
1371da177e4SLinus Torvalds s->u.amiga.status = ciab.pra & 7;
1381da177e4SLinus Torvalds s->u.amiga.statusdir = ciab.ddra & 7;
1391da177e4SLinus Torvalds mb();
1401da177e4SLinus Torvalds }
1411da177e4SLinus Torvalds
amiga_restore_state(struct parport * p,struct parport_state * s)1421da177e4SLinus Torvalds static void amiga_restore_state(struct parport *p, struct parport_state *s)
1431da177e4SLinus Torvalds {
1441da177e4SLinus Torvalds mb();
1451da177e4SLinus Torvalds ciaa.prb = s->u.amiga.data;
1461da177e4SLinus Torvalds ciaa.ddrb = s->u.amiga.datadir;
1471da177e4SLinus Torvalds ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
1481da177e4SLinus Torvalds ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
1491da177e4SLinus Torvalds mb();
1501da177e4SLinus Torvalds }
1511da177e4SLinus Torvalds
1521da177e4SLinus Torvalds static struct parport_operations pp_amiga_ops = {
1531da177e4SLinus Torvalds .write_data = amiga_write_data,
1541da177e4SLinus Torvalds .read_data = amiga_read_data,
1551da177e4SLinus Torvalds
1561da177e4SLinus Torvalds .write_control = amiga_write_control,
1571da177e4SLinus Torvalds .read_control = amiga_read_control,
1581da177e4SLinus Torvalds .frob_control = amiga_frob_control,
1591da177e4SLinus Torvalds
1601da177e4SLinus Torvalds .read_status = amiga_read_status,
1611da177e4SLinus Torvalds
1621da177e4SLinus Torvalds .enable_irq = amiga_enable_irq,
1631da177e4SLinus Torvalds .disable_irq = amiga_disable_irq,
1641da177e4SLinus Torvalds
1651da177e4SLinus Torvalds .data_forward = amiga_data_forward,
1661da177e4SLinus Torvalds .data_reverse = amiga_data_reverse,
1671da177e4SLinus Torvalds
1681da177e4SLinus Torvalds .init_state = amiga_init_state,
1691da177e4SLinus Torvalds .save_state = amiga_save_state,
1701da177e4SLinus Torvalds .restore_state = amiga_restore_state,
1711da177e4SLinus Torvalds
1721da177e4SLinus Torvalds .epp_write_data = parport_ieee1284_epp_write_data,
1731da177e4SLinus Torvalds .epp_read_data = parport_ieee1284_epp_read_data,
1741da177e4SLinus Torvalds .epp_write_addr = parport_ieee1284_epp_write_addr,
1751da177e4SLinus Torvalds .epp_read_addr = parport_ieee1284_epp_read_addr,
1761da177e4SLinus Torvalds
1771da177e4SLinus Torvalds .ecp_write_data = parport_ieee1284_ecp_write_data,
1781da177e4SLinus Torvalds .ecp_read_data = parport_ieee1284_ecp_read_data,
1791da177e4SLinus Torvalds .ecp_write_addr = parport_ieee1284_ecp_write_addr,
1801da177e4SLinus Torvalds
1811da177e4SLinus Torvalds .compat_write_data = parport_ieee1284_write_compat,
1821da177e4SLinus Torvalds .nibble_read_data = parport_ieee1284_read_nibble,
1831da177e4SLinus Torvalds .byte_read_data = parport_ieee1284_read_byte,
1841da177e4SLinus Torvalds
1851da177e4SLinus Torvalds .owner = THIS_MODULE,
1861da177e4SLinus Torvalds };
1871da177e4SLinus Torvalds
1881da177e4SLinus Torvalds /* ----------- Initialisation code --------------------------------- */
1891da177e4SLinus Torvalds
amiga_parallel_probe(struct platform_device * pdev)1906f8221c2SGeert Uytterhoeven static int __init amiga_parallel_probe(struct platform_device *pdev)
1911da177e4SLinus Torvalds {
1921da177e4SLinus Torvalds struct parport *p;
1931da177e4SLinus Torvalds int err;
1941da177e4SLinus Torvalds
1951da177e4SLinus Torvalds ciaa.ddrb = 0xff;
1961da177e4SLinus Torvalds ciab.ddra &= 0xf8;
1971da177e4SLinus Torvalds mb();
1981da177e4SLinus Torvalds
1991da177e4SLinus Torvalds p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
2001da177e4SLinus Torvalds PARPORT_DMA_NONE, &pp_amiga_ops);
2011da177e4SLinus Torvalds if (!p)
2026f8221c2SGeert Uytterhoeven return -EBUSY;
2031da177e4SLinus Torvalds
2046f8221c2SGeert Uytterhoeven err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
2056f8221c2SGeert Uytterhoeven p);
2061da177e4SLinus Torvalds if (err)
2071da177e4SLinus Torvalds goto out_irq;
2081da177e4SLinus Torvalds
209decf26f6SJoe Perches pr_info("%s: Amiga built-in port using irq\n", p->name);
2101da177e4SLinus Torvalds /* XXX: set operating mode */
2111da177e4SLinus Torvalds parport_announce_port(p);
2121da177e4SLinus Torvalds
2136f8221c2SGeert Uytterhoeven platform_set_drvdata(pdev, p);
2146f8221c2SGeert Uytterhoeven
2151da177e4SLinus Torvalds return 0;
2161da177e4SLinus Torvalds
2171da177e4SLinus Torvalds out_irq:
2181da177e4SLinus Torvalds parport_put_port(p);
2191da177e4SLinus Torvalds return err;
2201da177e4SLinus Torvalds }
2211da177e4SLinus Torvalds
amiga_parallel_remove(struct platform_device * pdev)2226f8221c2SGeert Uytterhoeven static int __exit amiga_parallel_remove(struct platform_device *pdev)
2231da177e4SLinus Torvalds {
2246f8221c2SGeert Uytterhoeven struct parport *port = platform_get_drvdata(pdev);
2256f8221c2SGeert Uytterhoeven
2266f8221c2SGeert Uytterhoeven parport_remove_port(port);
2276f8221c2SGeert Uytterhoeven if (port->irq != PARPORT_IRQ_NONE)
2286f8221c2SGeert Uytterhoeven free_irq(IRQ_AMIGA_CIAA_FLG, port);
2296f8221c2SGeert Uytterhoeven parport_put_port(port);
2306f8221c2SGeert Uytterhoeven return 0;
2311da177e4SLinus Torvalds }
2321da177e4SLinus Torvalds
2336f8221c2SGeert Uytterhoeven static struct platform_driver amiga_parallel_driver = {
2346f8221c2SGeert Uytterhoeven .remove = __exit_p(amiga_parallel_remove),
2356f8221c2SGeert Uytterhoeven .driver = {
2366f8221c2SGeert Uytterhoeven .name = "amiga-parallel",
2376f8221c2SGeert Uytterhoeven },
2386f8221c2SGeert Uytterhoeven };
2396f8221c2SGeert Uytterhoeven
2405bcdf0ceSFabio Porcedda module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
2411da177e4SLinus Torvalds
2421da177e4SLinus Torvalds MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
2431da177e4SLinus Torvalds MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
2441da177e4SLinus Torvalds MODULE_LICENSE("GPL");
2456f8221c2SGeert Uytterhoeven MODULE_ALIAS("platform:amiga-parallel");
246