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 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 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 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 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 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 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 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 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 1001da177e4SLinus Torvalds static void amiga_enable_irq(struct parport *p) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds enable_irq(IRQ_AMIGA_CIAA_FLG); 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds static void amiga_disable_irq(struct parport *p) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds disable_irq(IRQ_AMIGA_CIAA_FLG); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 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 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 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 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 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 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 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_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); 2451da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2466f8221c2SGeert Uytterhoeven MODULE_ALIAS("platform:amiga-parallel"); 247