365 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* Low-level parallel port routines for the Multiface 3 card3 *4 * Author: Joerg Dorchain <joerg@dorchain.net>5 *6 * (C) The elitist m68k Users(TM)7 *8 * based on the existing parport_amiga and lp_mfc9 *10 *11 * From the MFC3 documentation:12 * 13 * Miscellaneous PIA Details14 * -------------------------15 * 16 * The two open-drain interrupt outputs /IRQA and /IRQB are routed to17 * /INT2 of the Z2 bus.18 * 19 * The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z220 * bus. This means that any PIA registers are accessed at even addresses.21 * 22 * Centronics Pin Connections for the PIA23 * --------------------------------------24 * 25 * The following table shows the connections between the PIA and the26 * Centronics interface connector. These connections implement a single, but27 * very complete, Centronics type interface. The Pin column gives the pin28 * numbers of the PIA. The Centronics pin numbers can be found in the section29 * "Parallel Connectors".30 * 31 * 32 * Pin | PIA | Dir | Centronics Names33 * -------+-----+-----+---------------------------------------------------------34 * 19 | CB2 | --> | /STROBE (aka /DRDY)35 * 10-17 | PBx | <-> | DATA0 - DATA736 * 18 | CB1 | <-- | /ACK37 * 40 | CA1 | <-- | BUSY38 * 3 | PA1 | <-- | PAPER-OUT (aka POUT)39 * 4 | PA2 | <-- | SELECTED (aka SEL)40 * 9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME)41 * 6 | PA4 | <-- | /ERROR (aka /FAULT)42 * 7 | PA5 | --> | DIR (aka /SELECT-IN)43 * 8 | PA6 | --> | /AUTO-FEED-XT44 * 39 | CA2 | --> | open45 * 5 | PA3 | <-- | /ACK (same as CB1!)46 * 2 | PA0 | <-- | BUSY (same as CA1!)47 * -------+-----+-----+---------------------------------------------------------48 * 49 * Should be enough to understand some of the driver.50 *51 * Per convention for normal use the port registers are visible.52 * If you need the data direction registers, restore the value in the53 * control register.54 */55 56#include "multiface.h"57#include <linux/module.h>58#include <linux/init.h>59#include <linux/parport.h>60#include <linux/delay.h>61#include <linux/mc6821.h>62#include <linux/zorro.h>63#include <linux/interrupt.h>64#include <asm/setup.h>65#include <asm/amigahw.h>66#include <asm/irq.h>67#include <asm/amigaints.h>68 69/* Maximum Number of Cards supported */70#define MAX_MFC 571 72#undef DEBUG73 74static struct parport *this_port[MAX_MFC] = {NULL, };75static volatile int dummy; /* for trigger readds */76 77#define pia(dev) ((struct pia *)(dev->base))78static struct parport_operations pp_mfc3_ops;79 80static void mfc3_write_data(struct parport *p, unsigned char data)81{82 pr_debug("write_data %c\n", data);83 84 dummy = pia(p)->pprb; /* clears irq bit */85 /* Triggers also /STROBE.*/86 pia(p)->pprb = data;87}88 89static unsigned char mfc3_read_data(struct parport *p)90{91 /* clears interrupt bit. Triggers also /STROBE. */92 return pia(p)->pprb;93}94 95static unsigned char control_pc_to_mfc3(unsigned char control)96{97 unsigned char ret = 32|64;98 99 if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */100 ret &= ~32; /* /SELECT_IN */101 if (control & PARPORT_CONTROL_INIT) /* INITP */102 ret |= 128;103 if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */104 ret &= ~64;105 /* PARPORT_CONTROL_STROBE handled directly by hardware */106 return ret;107}108 109static unsigned char control_mfc3_to_pc(unsigned char control)110{111 unsigned char ret = PARPORT_CONTROL_STROBE 112 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;113 114 if (control & 128) /* /INITP */115 ret |= PARPORT_CONTROL_INIT;116 if (control & 64) /* /AUTOLF */117 ret &= ~PARPORT_CONTROL_AUTOFD;118 if (control & 32) /* /SELECT_IN */119 ret &= ~PARPORT_CONTROL_SELECT;120 return ret;121}122 123static void mfc3_write_control(struct parport *p, unsigned char control)124{125 pr_debug("write_control %02x\n", control);126 pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);127}128 129static unsigned char mfc3_read_control( struct parport *p)130{131 pr_debug("read_control\n");132 return control_mfc3_to_pc(pia(p)->ppra & 0xe0);133}134 135static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)136{137 unsigned char old;138 139 pr_debug("frob_control mask %02x, value %02x\n", mask, val);140 old = mfc3_read_control(p);141 mfc3_write_control(p, (old & ~mask) ^ val);142 return old;143}144 145static unsigned char status_mfc3_to_pc(unsigned char status)146{147 unsigned char ret = PARPORT_STATUS_BUSY;148 149 if (status & 1) /* Busy */150 ret &= ~PARPORT_STATUS_BUSY;151 if (status & 2) /* PaperOut */152 ret |= PARPORT_STATUS_PAPEROUT;153 if (status & 4) /* Selected */154 ret |= PARPORT_STATUS_SELECT;155 if (status & 8) /* Ack */156 ret |= PARPORT_STATUS_ACK;157 if (status & 16) /* /ERROR */158 ret |= PARPORT_STATUS_ERROR;159 160 return ret;161}162 163static unsigned char mfc3_read_status(struct parport *p)164{165 unsigned char status;166 167 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);168 pr_debug("read_status %02x\n", status);169 return status;170}171 172static int use_cnt;173 174static irqreturn_t mfc3_interrupt(int irq, void *dev_id)175{176 int i;177 178 for( i = 0; i < MAX_MFC; i++)179 if (this_port[i] != NULL)180 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */181 dummy = pia(this_port[i])->pprb; /* clear irq bit */182 parport_generic_irq(this_port[i]);183 }184 return IRQ_HANDLED;185}186 187static void mfc3_enable_irq(struct parport *p)188{189 pia(p)->crb |= PIA_C1_ENABLE_IRQ;190}191 192static void mfc3_disable_irq(struct parport *p)193{194 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;195}196 197static void mfc3_data_forward(struct parport *p)198{199 pr_debug("forward\n");200 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */201 pia(p)->pddrb = 255; /* all pins output */202 pia(p)->crb |= PIA_DDR; /* make data register visible - default */203}204 205static void mfc3_data_reverse(struct parport *p)206{207 pr_debug("reverse\n");208 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */209 pia(p)->pddrb = 0; /* all pins input */210 pia(p)->crb |= PIA_DDR; /* make data register visible - default */211}212 213static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)214{215 s->u.amiga.data = 0;216 s->u.amiga.datadir = 255;217 s->u.amiga.status = 0;218 s->u.amiga.statusdir = 0xe0;219}220 221static void mfc3_save_state(struct parport *p, struct parport_state *s)222{223 s->u.amiga.data = pia(p)->pprb;224 pia(p)->crb &= ~PIA_DDR;225 s->u.amiga.datadir = pia(p)->pddrb;226 pia(p)->crb |= PIA_DDR;227 s->u.amiga.status = pia(p)->ppra;228 pia(p)->cra &= ~PIA_DDR;229 s->u.amiga.statusdir = pia(p)->pddrb;230 pia(p)->cra |= PIA_DDR;231}232 233static void mfc3_restore_state(struct parport *p, struct parport_state *s)234{235 pia(p)->pprb = s->u.amiga.data;236 pia(p)->crb &= ~PIA_DDR;237 pia(p)->pddrb = s->u.amiga.datadir;238 pia(p)->crb |= PIA_DDR;239 pia(p)->ppra = s->u.amiga.status;240 pia(p)->cra &= ~PIA_DDR;241 pia(p)->pddrb = s->u.amiga.statusdir;242 pia(p)->cra |= PIA_DDR;243}244 245static struct parport_operations pp_mfc3_ops = {246 .write_data = mfc3_write_data,247 .read_data = mfc3_read_data,248 249 .write_control = mfc3_write_control,250 .read_control = mfc3_read_control,251 .frob_control = mfc3_frob_control,252 253 .read_status = mfc3_read_status,254 255 .enable_irq = mfc3_enable_irq,256 .disable_irq = mfc3_disable_irq,257 258 .data_forward = mfc3_data_forward, 259 .data_reverse = mfc3_data_reverse, 260 261 .init_state = mfc3_init_state,262 .save_state = mfc3_save_state,263 .restore_state = mfc3_restore_state,264 265 .epp_write_data = parport_ieee1284_epp_write_data,266 .epp_read_data = parport_ieee1284_epp_read_data,267 .epp_write_addr = parport_ieee1284_epp_write_addr,268 .epp_read_addr = parport_ieee1284_epp_read_addr,269 270 .ecp_write_data = parport_ieee1284_ecp_write_data,271 .ecp_read_data = parport_ieee1284_ecp_read_data,272 .ecp_write_addr = parport_ieee1284_ecp_write_addr,273 274 .compat_write_data = parport_ieee1284_write_compat,275 .nibble_read_data = parport_ieee1284_read_nibble,276 .byte_read_data = parport_ieee1284_read_byte,277 278 .owner = THIS_MODULE,279};280 281/* ----------- Initialisation code --------------------------------- */282 283static int __init parport_mfc3_init(void)284{285 struct parport *p;286 int pias = 0;287 struct pia *pp;288 struct zorro_dev *z = NULL;289 290 if (!MACH_IS_AMIGA)291 return -ENODEV;292 293 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {294 unsigned long piabase = z->resource.start+PIABASE;295 if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))296 continue;297 298 pp = ZTWO_VADDR(piabase);299 pp->crb = 0;300 pp->pddrb = 255; /* all data pins output */301 pp->crb = PIA_DDR|32|8;302 dummy = pp->pddrb; /* reading clears interrupt */303 pp->cra = 0;304 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */305 pp->cra = PIA_DDR;306 pp->ppra = 0; /* reset printer */307 udelay(10);308 pp->ppra = 128;309 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,310 PARPORT_DMA_NONE, &pp_mfc3_ops);311 if (!p)312 goto out_port;313 314 if (p->irq != PARPORT_IRQ_NONE) {315 if (use_cnt++ == 0)316 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))317 goto out_irq;318 }319 p->dev = &z->dev;320 321 this_port[pias++] = p;322 pr_info("%s: Multiface III port using irq\n", p->name);323 /* XXX: set operating mode */324 325 p->private_data = (void *)piabase;326 parport_announce_port (p);327 328 if (pias >= MAX_MFC)329 break;330 continue;331 332 out_irq:333 parport_put_port(p);334 out_port:335 release_mem_region(piabase, sizeof(struct pia));336 }337 338 return pias ? 0 : -ENODEV;339}340 341static void __exit parport_mfc3_exit(void)342{343 int i;344 345 for (i = 0; i < MAX_MFC; i++) {346 if (!this_port[i])347 continue;348 parport_remove_port(this_port[i]);349 if (this_port[i]->irq != PARPORT_IRQ_NONE) {350 if (--use_cnt == 0) 351 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);352 }353 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));354 parport_put_port(this_port[i]);355 }356}357 358 359MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");360MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");361MODULE_LICENSE("GPL");362 363module_init(parport_mfc3_init)364module_exit(parport_mfc3_exit)365