drivers/parport/parport_mfc3.c

   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
  74 static struct parport *this_port[MAX_MFC] = {NULL, };
  75 static volatile int dummy; /* for trigger readds */
  76
  77 #define pia(dev) ((struct pia *)(dev->base))
  78 static struct parport_operations pp_mfc3_ops;
  79
  80 static 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
  89 static unsigned char mfc3_read_data(struct parport *p)
  90 {
  91         /* clears interrupt bit. Triggers also /STROBE. */
  92         return pia(p)->pprb;
  93 }
  94
  95 static 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
 110 static 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
 124 static 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
 130 static 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
 136 static 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
 146 static 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
 164 static 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
 173 static int use_cnt;
 174
 175 static 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
 188 static void mfc3_enable_irq(struct parport *p)
 189 {
 190         pia(p)->crb |= PIA_C1_ENABLE_IRQ;
 191 }
 192
 193 static void mfc3_disable_irq(struct parport *p)
 194 {
 195         pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
 196 }
 197
 198 static 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
 206 static 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
 214 static 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
 222 static 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
 234 static 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
 246 static 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
 284 static 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
 342 static 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
 360 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
 361 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
 362 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
 363 MODULE_LICENSE("GPL");
 364
 365 module_init(parport_mfc3_init)
 366 module_exit(parport_mfc3_exit)