11da177e4SLinus Torvalds /* Low-level parallel port routines for the Amiga built-in port 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Author: Joerg Dorchain <joerg@dorchain.net> 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * This is a complete rewrite of the code, but based heaviy upon the old 61da177e4SLinus Torvalds * lp_intern. code. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * The built-in Amiga parallel port provides one port at a fixed address 91da177e4SLinus Torvalds * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status 101da177e4SLinus Torvalds * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically 111da177e4SLinus Torvalds * in hardware when the data register is accessed), and 1 input control line 121da177e4SLinus Torvalds * /ACK, able to cause an interrupt, but both not directly settable by 131da177e4SLinus Torvalds * software. 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/module.h> 171da177e4SLinus Torvalds #include <linux/init.h> 181da177e4SLinus Torvalds #include <linux/parport.h> 191da177e4SLinus Torvalds #include <linux/ioport.h> 201da177e4SLinus Torvalds #include <linux/interrupt.h> 211da177e4SLinus Torvalds #include <asm/setup.h> 221da177e4SLinus Torvalds #include <asm/amigahw.h> 231da177e4SLinus Torvalds #include <asm/irq.h> 241da177e4SLinus Torvalds #include <asm/io.h> 251da177e4SLinus Torvalds #include <asm/amigaints.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #undef DEBUG 281da177e4SLinus Torvalds #ifdef DEBUG 291da177e4SLinus Torvalds #define DPRINTK printk 301da177e4SLinus Torvalds #else 311da177e4SLinus Torvalds #define DPRINTK(x...) do { } while (0) 321da177e4SLinus Torvalds #endif 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds static struct parport *this_port = NULL; 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds static void amiga_write_data(struct parport *p, unsigned char data) 371da177e4SLinus Torvalds { 381da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "write_data %c\n",data); 391da177e4SLinus Torvalds /* Triggers also /STROBE. This behavior cannot be changed */ 401da177e4SLinus Torvalds ciaa.prb = data; 411da177e4SLinus Torvalds mb(); 421da177e4SLinus Torvalds } 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds static unsigned char amiga_read_data(struct parport *p) 451da177e4SLinus Torvalds { 461da177e4SLinus Torvalds /* Triggers also /STROBE. This behavior cannot be changed */ 471da177e4SLinus Torvalds return ciaa.prb; 481da177e4SLinus Torvalds } 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #if 0 511da177e4SLinus Torvalds static unsigned char control_pc_to_amiga(unsigned char control) 521da177e4SLinus Torvalds { 531da177e4SLinus Torvalds unsigned char ret = 0; 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ 561da177e4SLinus Torvalds ; 571da177e4SLinus Torvalds if (control & PARPORT_CONTROL_INIT) /* INITP */ 581da177e4SLinus Torvalds /* reset connected to cpu reset pin */; 591da177e4SLinus Torvalds if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ 601da177e4SLinus Torvalds /* Not connected */; 611da177e4SLinus Torvalds if (control & PARPORT_CONTROL_STROBE) /* Strobe */ 621da177e4SLinus Torvalds /* Handled only directly by hardware */; 631da177e4SLinus Torvalds return ret; 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds #endif 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds static unsigned char control_amiga_to_pc(unsigned char control) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds return PARPORT_CONTROL_SELECT | 701da177e4SLinus Torvalds PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE; 711da177e4SLinus Torvalds /* fake value: interrupt enable, select in, no reset, 721da177e4SLinus Torvalds no autolf, no strobe - seems to be closest the wiring diagram */ 731da177e4SLinus Torvalds } 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static void amiga_write_control(struct parport *p, unsigned char control) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "write_control %02x\n",control); 781da177e4SLinus Torvalds /* No implementation possible */ 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static unsigned char amiga_read_control( struct parport *p) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "read_control \n"); 841da177e4SLinus Torvalds return control_amiga_to_pc(0); 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds unsigned char old; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val); 921da177e4SLinus Torvalds old = amiga_read_control(p); 931da177e4SLinus Torvalds amiga_write_control(p, (old & ~mask) ^ val); 941da177e4SLinus Torvalds return old; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds #if 0 /* currently unused */ 981da177e4SLinus Torvalds static unsigned char status_pc_to_amiga(unsigned char status) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds unsigned char ret = 1; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds if (status & PARPORT_STATUS_BUSY) /* Busy */ 1031da177e4SLinus Torvalds ret &= ~1; 1041da177e4SLinus Torvalds if (status & PARPORT_STATUS_ACK) /* Ack */ 1051da177e4SLinus Torvalds /* handled in hardware */; 1061da177e4SLinus Torvalds if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */ 1071da177e4SLinus Torvalds ret |= 2; 1081da177e4SLinus Torvalds if (status & PARPORT_STATUS_SELECT) /* select */ 1091da177e4SLinus Torvalds ret |= 4; 1101da177e4SLinus Torvalds if (status & PARPORT_STATUS_ERROR) /* error */ 1111da177e4SLinus Torvalds /* not connected */; 1121da177e4SLinus Torvalds return ret; 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds #endif 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds static unsigned char status_amiga_to_pc(unsigned char status) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds if (status & 1) /* Busy */ 1211da177e4SLinus Torvalds ret &= ~PARPORT_STATUS_BUSY; 1221da177e4SLinus Torvalds if (status & 2) /* PaperOut */ 1231da177e4SLinus Torvalds ret |= PARPORT_STATUS_PAPEROUT; 1241da177e4SLinus Torvalds if (status & 4) /* Selected */ 1251da177e4SLinus Torvalds ret |= PARPORT_STATUS_SELECT; 1261da177e4SLinus Torvalds /* the rest is not connected or handled autonomously in hardware */ 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds return ret; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds static unsigned char amiga_read_status(struct parport *p) 1321da177e4SLinus Torvalds { 1331da177e4SLinus Torvalds unsigned char status; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds status = status_amiga_to_pc(ciab.pra & 7); 1361da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "read_status %02x\n", status); 1371da177e4SLinus Torvalds return status; 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* as this ports irq handling is already done, we use a generic funktion */ 1411da177e4SLinus Torvalds static irqreturn_t amiga_interrupt(int irq, void *dev_id, struct pt_regs *regs) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds parport_generic_irq(irq, (struct parport *) dev_id, regs); 1441da177e4SLinus Torvalds return IRQ_HANDLED; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static void amiga_enable_irq(struct parport *p) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds enable_irq(IRQ_AMIGA_CIAA_FLG); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds static void amiga_disable_irq(struct parport *p) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds disable_irq(IRQ_AMIGA_CIAA_FLG); 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static void amiga_data_forward(struct parport *p) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "forward\n"); 1601da177e4SLinus Torvalds ciaa.ddrb = 0xff; /* all pins output */ 1611da177e4SLinus Torvalds mb(); 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static void amiga_data_reverse(struct parport *p) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds DPRINTK(KERN_DEBUG "reverse\n"); 1671da177e4SLinus Torvalds ciaa.ddrb = 0; /* all pins input */ 1681da177e4SLinus Torvalds mb(); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds static void amiga_init_state(struct pardevice *dev, struct parport_state *s) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds s->u.amiga.data = 0; 1741da177e4SLinus Torvalds s->u.amiga.datadir = 255; 1751da177e4SLinus Torvalds s->u.amiga.status = 0; 1761da177e4SLinus Torvalds s->u.amiga.statusdir = 0; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds static void amiga_save_state(struct parport *p, struct parport_state *s) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds mb(); 1821da177e4SLinus Torvalds s->u.amiga.data = ciaa.prb; 1831da177e4SLinus Torvalds s->u.amiga.datadir = ciaa.ddrb; 1841da177e4SLinus Torvalds s->u.amiga.status = ciab.pra & 7; 1851da177e4SLinus Torvalds s->u.amiga.statusdir = ciab.ddra & 7; 1861da177e4SLinus Torvalds mb(); 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds static void amiga_restore_state(struct parport *p, struct parport_state *s) 1901da177e4SLinus Torvalds { 1911da177e4SLinus Torvalds mb(); 1921da177e4SLinus Torvalds ciaa.prb = s->u.amiga.data; 1931da177e4SLinus Torvalds ciaa.ddrb = s->u.amiga.datadir; 1941da177e4SLinus Torvalds ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; 1951da177e4SLinus Torvalds ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; 1961da177e4SLinus Torvalds mb(); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds static struct parport_operations pp_amiga_ops = { 2001da177e4SLinus Torvalds .write_data = amiga_write_data, 2011da177e4SLinus Torvalds .read_data = amiga_read_data, 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds .write_control = amiga_write_control, 2041da177e4SLinus Torvalds .read_control = amiga_read_control, 2051da177e4SLinus Torvalds .frob_control = amiga_frob_control, 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds .read_status = amiga_read_status, 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds .enable_irq = amiga_enable_irq, 2101da177e4SLinus Torvalds .disable_irq = amiga_disable_irq, 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds .data_forward = amiga_data_forward, 2131da177e4SLinus Torvalds .data_reverse = amiga_data_reverse, 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds .init_state = amiga_init_state, 2161da177e4SLinus Torvalds .save_state = amiga_save_state, 2171da177e4SLinus Torvalds .restore_state = amiga_restore_state, 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds .epp_write_data = parport_ieee1284_epp_write_data, 2201da177e4SLinus Torvalds .epp_read_data = parport_ieee1284_epp_read_data, 2211da177e4SLinus Torvalds .epp_write_addr = parport_ieee1284_epp_write_addr, 2221da177e4SLinus Torvalds .epp_read_addr = parport_ieee1284_epp_read_addr, 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds .ecp_write_data = parport_ieee1284_ecp_write_data, 2251da177e4SLinus Torvalds .ecp_read_data = parport_ieee1284_ecp_read_data, 2261da177e4SLinus Torvalds .ecp_write_addr = parport_ieee1284_ecp_write_addr, 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds .compat_write_data = parport_ieee1284_write_compat, 2291da177e4SLinus Torvalds .nibble_read_data = parport_ieee1284_read_nibble, 2301da177e4SLinus Torvalds .byte_read_data = parport_ieee1284_read_byte, 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds .owner = THIS_MODULE, 2331da177e4SLinus Torvalds }; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* ----------- Initialisation code --------------------------------- */ 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds static int __init parport_amiga_init(void) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds struct parport *p; 2401da177e4SLinus Torvalds int err; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_PARALLEL)) 2431da177e4SLinus Torvalds return -ENODEV; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds err = -EBUSY; 2461da177e4SLinus Torvalds if (!request_mem_region(CIAA_PHYSADDR-1+0x100, 0x100, "parallel")) 2471da177e4SLinus Torvalds goto out_mem; 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds ciaa.ddrb = 0xff; 2501da177e4SLinus Torvalds ciab.ddra &= 0xf8; 2511da177e4SLinus Torvalds mb(); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, 2541da177e4SLinus Torvalds PARPORT_DMA_NONE, &pp_amiga_ops); 2551da177e4SLinus Torvalds if (!p) 2561da177e4SLinus Torvalds goto out_port; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds err = request_irq(IRQ_AMIGA_CIAA_FLG, amiga_interrupt, 0, p->name, p); 2591da177e4SLinus Torvalds if (err) 2601da177e4SLinus Torvalds goto out_irq; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds this_port = p; 2631da177e4SLinus Torvalds printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); 2641da177e4SLinus Torvalds /* XXX: set operating mode */ 2651da177e4SLinus Torvalds parport_announce_port(p); 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds return 0; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds out_irq: 2701da177e4SLinus Torvalds parport_put_port(p); 2711da177e4SLinus Torvalds out_port: 2721da177e4SLinus Torvalds release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); 2731da177e4SLinus Torvalds out_mem: 2741da177e4SLinus Torvalds return err; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds static void __exit parport_amiga_exit(void) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds parport_remove_port(this_port); 2801da177e4SLinus Torvalds if (this_port->irq != PARPORT_IRQ_NONE) 2811da177e4SLinus Torvalds free_irq(IRQ_AMIGA_CIAA_FLG, this_port); 2821da177e4SLinus Torvalds parport_put_port(this_port); 2831da177e4SLinus Torvalds release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 2881da177e4SLinus Torvalds MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); 2891da177e4SLinus Torvalds MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); 2901da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds module_init(parport_amiga_init) 2931da177e4SLinus Torvalds module_exit(parport_amiga_exit) 294