linux/drivers/parport/parport_mfc3.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Low-level parallel port routines for the Multiface 3 card
   3 *
   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_mfc
   9 *
  10 *
  11 * From the MFC3 documentation:
  12 * 
  13 * Miscellaneous PIA Details
  14 * -------------------------
  15 * 
  16 *      The two open-drain interrupt outputs /IRQA and /IRQB are routed to
  17 * /INT2 of the Z2 bus.
  18 * 
  19 *      The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
  20 * bus. This means that any PIA registers are accessed at even addresses.
  21 * 
  22 * Centronics Pin Connections for the PIA
  23 * --------------------------------------
  24 * 
  25 *      The following table shows the connections between the PIA and the
  26 * Centronics interface connector. These connections implement a single, but
  27 * very complete, Centronics type interface. The Pin column gives the pin
  28 * numbers of the PIA. The Centronics pin numbers can be found in the section
  29 * "Parallel Connectors".
  30 * 
  31 * 
  32 *    Pin | PIA | Dir | Centronics Names
  33 * -------+-----+-----+---------------------------------------------------------
  34 *     19 | CB2 | --> | /STROBE (aka /DRDY)
  35 *  10-17 | PBx | <-> | DATA0 - DATA7
  36 *     18 | CB1 | <-- | /ACK
  37 *     40 | CA1 | <-- | BUSY
  38 *      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-XT
  44 *     39 | CA2 | --> | open
  45 *      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 the
  53 * 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 5
  71
  72#undef DEBUG
  73
  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        if (control & PARPORT_CONTROL_STROBE) /* Strobe */
 106                /* Handled directly by hardware */;
 107        return ret;
 108}
 109
 110static unsigned char control_mfc3_to_pc(unsigned char control)
 111{
 112        unsigned char ret = PARPORT_CONTROL_STROBE 
 113                          | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
 114
 115        if (control & 128) /* /INITP */
 116                ret |= PARPORT_CONTROL_INIT;
 117        if (control & 64) /* /AUTOLF */
 118                ret &= ~PARPORT_CONTROL_AUTOFD;
 119        if (control & 32) /* /SELECT_IN */
 120                ret &= ~PARPORT_CONTROL_SELECT;
 121        return ret;
 122}
 123
 124static void mfc3_write_control(struct parport *p, unsigned char control)
 125{
 126        pr_debug("write_control %02x\n", control);
 127        pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
 128}
 129        
 130static unsigned char mfc3_read_control( struct parport *p)
 131{
 132        pr_debug("read_control\n");
 133        return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
 134}
 135
 136static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 137{
 138        unsigned char old;
 139
 140        pr_debug("frob_control mask %02x, value %02x\n", mask, val);
 141        old = mfc3_read_control(p);
 142        mfc3_write_control(p, (old & ~mask) ^ val);
 143        return old;
 144}
 145
 146static unsigned char status_mfc3_to_pc(unsigned char status)
 147{
 148        unsigned char ret = PARPORT_STATUS_BUSY;
 149
 150        if (status & 1) /* Busy */
 151                ret &= ~PARPORT_STATUS_BUSY;
 152        if (status & 2) /* PaperOut */
 153                ret |= PARPORT_STATUS_PAPEROUT;
 154        if (status & 4) /* Selected */
 155                ret |= PARPORT_STATUS_SELECT;
 156        if (status & 8) /* Ack */
 157                ret |= PARPORT_STATUS_ACK;
 158        if (status & 16) /* /ERROR */
 159                ret |= PARPORT_STATUS_ERROR;
 160
 161        return ret;
 162}
 163
 164static unsigned char mfc3_read_status(struct parport *p)
 165{
 166        unsigned char status;
 167
 168        status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
 169        pr_debug("read_status %02x\n", status);
 170        return status;
 171}
 172
 173static int use_cnt;
 174
 175static irqreturn_t mfc3_interrupt(int irq, void *dev_id)
 176{
 177        int i;
 178
 179        for( i = 0; i < MAX_MFC; i++)
 180                if (this_port[i] != NULL)
 181                        if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
 182                                dummy = pia(this_port[i])->pprb; /* clear irq bit */
 183                                parport_generic_irq(this_port[i]);
 184                        }
 185        return IRQ_HANDLED;
 186}
 187
 188static void mfc3_enable_irq(struct parport *p)
 189{
 190        pia(p)->crb |= PIA_C1_ENABLE_IRQ;
 191}
 192
 193static void mfc3_disable_irq(struct parport *p)
 194{
 195        pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
 196}
 197
 198static void mfc3_data_forward(struct parport *p)
 199{
 200        pr_debug("forward\n");
 201        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 202        pia(p)->pddrb = 255; /* all pins output */
 203        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 204}
 205
 206static void mfc3_data_reverse(struct parport *p)
 207{
 208        pr_debug("reverse\n");
 209        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 210        pia(p)->pddrb = 0; /* all pins input */
 211        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 212}
 213
 214static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
 215{
 216        s->u.amiga.data = 0;
 217        s->u.amiga.datadir = 255;
 218        s->u.amiga.status = 0;
 219        s->u.amiga.statusdir = 0xe0;
 220}
 221
 222static void mfc3_save_state(struct parport *p, struct parport_state *s)
 223{
 224        s->u.amiga.data = pia(p)->pprb;
 225        pia(p)->crb &= ~PIA_DDR;
 226        s->u.amiga.datadir = pia(p)->pddrb;
 227        pia(p)->crb |= PIA_DDR;
 228        s->u.amiga.status = pia(p)->ppra;
 229        pia(p)->cra &= ~PIA_DDR;
 230        s->u.amiga.statusdir = pia(p)->pddrb;
 231        pia(p)->cra |= PIA_DDR;
 232}
 233
 234static void mfc3_restore_state(struct parport *p, struct parport_state *s)
 235{
 236        pia(p)->pprb = s->u.amiga.data;
 237        pia(p)->crb &= ~PIA_DDR;
 238        pia(p)->pddrb = s->u.amiga.datadir;
 239        pia(p)->crb |= PIA_DDR;
 240        pia(p)->ppra = s->u.amiga.status;
 241        pia(p)->cra &= ~PIA_DDR;
 242        pia(p)->pddrb = s->u.amiga.statusdir;
 243        pia(p)->cra |= PIA_DDR;
 244}
 245
 246static struct parport_operations pp_mfc3_ops = {
 247        .write_data     = mfc3_write_data,
 248        .read_data      = mfc3_read_data,
 249
 250        .write_control  = mfc3_write_control,
 251        .read_control   = mfc3_read_control,
 252        .frob_control   = mfc3_frob_control,
 253
 254        .read_status    = mfc3_read_status,
 255
 256        .enable_irq     = mfc3_enable_irq,
 257        .disable_irq    = mfc3_disable_irq,
 258
 259        .data_forward   = mfc3_data_forward, 
 260        .data_reverse   = mfc3_data_reverse, 
 261
 262        .init_state     = mfc3_init_state,
 263        .save_state     = mfc3_save_state,
 264        .restore_state  = mfc3_restore_state,
 265
 266        .epp_write_data = parport_ieee1284_epp_write_data,
 267        .epp_read_data  = parport_ieee1284_epp_read_data,
 268        .epp_write_addr = parport_ieee1284_epp_write_addr,
 269        .epp_read_addr  = parport_ieee1284_epp_read_addr,
 270
 271        .ecp_write_data = parport_ieee1284_ecp_write_data,
 272        .ecp_read_data  = parport_ieee1284_ecp_read_data,
 273        .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 274
 275        .compat_write_data      = parport_ieee1284_write_compat,
 276        .nibble_read_data       = parport_ieee1284_read_nibble,
 277        .byte_read_data         = parport_ieee1284_read_byte,
 278
 279        .owner          = THIS_MODULE,
 280};
 281
 282/* ----------- Initialisation code --------------------------------- */
 283
 284static int __init parport_mfc3_init(void)
 285{
 286        struct parport *p;
 287        int pias = 0;
 288        struct pia *pp;
 289        struct zorro_dev *z = NULL;
 290
 291        if (!MACH_IS_AMIGA)
 292                return -ENODEV;
 293
 294        while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
 295                unsigned long piabase = z->resource.start+PIABASE;
 296                if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
 297                        continue;
 298
 299                pp = ZTWO_VADDR(piabase);
 300                pp->crb = 0;
 301                pp->pddrb = 255; /* all data pins output */
 302                pp->crb = PIA_DDR|32|8;
 303                dummy = pp->pddrb; /* reading clears interrupt */
 304                pp->cra = 0;
 305                pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */
 306                pp->cra = PIA_DDR;
 307                pp->ppra = 0; /* reset printer */
 308                udelay(10);
 309                pp->ppra = 128;
 310                p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
 311                                          PARPORT_DMA_NONE, &pp_mfc3_ops);
 312                if (!p)
 313                        goto out_port;
 314
 315                if (p->irq != PARPORT_IRQ_NONE) {
 316                        if (use_cnt++ == 0)
 317                                if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
 318                                        goto out_irq;
 319                }
 320                p->dev = &z->dev;
 321
 322                this_port[pias++] = p;
 323                pr_info("%s: Multiface III port using irq\n", p->name);
 324                /* XXX: set operating mode */
 325
 326                p->private_data = (void *)piabase;
 327                parport_announce_port (p);
 328
 329                if (pias >= MAX_MFC)
 330                        break;
 331                continue;
 332
 333        out_irq:
 334                parport_put_port(p);
 335        out_port:
 336                release_mem_region(piabase, sizeof(struct pia));
 337        }
 338
 339        return pias ? 0 : -ENODEV;
 340}
 341
 342static void __exit parport_mfc3_exit(void)
 343{
 344        int i;
 345
 346        for (i = 0; i < MAX_MFC; i++) {
 347                if (!this_port[i])
 348                        continue;
 349                parport_remove_port(this_port[i]);
 350                if (this_port[i]->irq != PARPORT_IRQ_NONE) {
 351                        if (--use_cnt == 0) 
 352                                free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
 353                }
 354                release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
 355                parport_put_port(this_port[i]);
 356        }
 357}
 358
 359
 360MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
 361MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
 362MODULE_LICENSE("GPL");
 363
 364module_init(parport_mfc3_init)
 365module_exit(parport_mfc3_exit)
 366