LXR linux-old/drivers/parport/parport

   1/* Low-level parallel port routines for the Multiface 3 card
   2 *
   3 * Author: Joerg Dorchain <joerg@dorchain.net>
   4 *
   5 * (C) The elitist m68k Users(TM)
   6 *
   7 * based on the existing parport_amiga and lp_mfc
   8 *
   9 *
  10 * From the MFC3 documentation:
  11 * 
  12 * Miscellaneous PIA Details
  13 * -------------------------
  14 * 
  15 *      The two open-drain interrupt outputs /IRQA and /IRQB are routed to
  16 * /INT2 of the Z2 bus.
  17 * 
  18 *      The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
  19 * bus. This means that any PIA registers are accessed at even addresses.
  20 * 
  21 * Centronics Pin Connections for the PIA
  22 * --------------------------------------
  23 * 
  24 *      The following table shows the connections between the PIA and the
  25 * Centronics interface connector. These connections implement a single, but
  26 * very complete, Centronics type interface. The Pin column gives the pin
  27 * numbers of the PIA. The Centronics pin numbers can be found in the section
  28 * "Parallel Connectors".
  29 * 
  30 * 
  31 *    Pin | PIA | Dir | Centronics Names
  32 * -------+-----+-----+---------------------------------------------------------
  33 *     19 | CB2 | --> | /STROBE (aka /DRDY)
  34 *  10-17 | PBx | <-> | DATA0 - DATA7
  35 *     18 | CB1 | <-- | /ACK
  36 *     40 | CA1 | <-- | BUSY
  37 *      3 | PA1 | <-- | PAPER-OUT (aka POUT)
  38 *      4 | PA2 | <-- | SELECTED (aka SEL)
  39 *      9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME)
  40 *      6 | PA4 | <-- | /ERROR (aka /FAULT)
  41 *      7 | PA5 | --> | DIR (aka /SELECT-IN)
  42 *      8 | PA6 | --> | /AUTO-FEED-XT
  43 *     39 | CA2 | --> | open
  44 *      5 | PA3 | <-- | /ACK (same as CB1!)
  45 *      2 | PA0 | <-- | BUSY (same as CA1!)
  46 * -------+-----+-----+---------------------------------------------------------
  47 * 
  48 * Should be enough to understand some of the driver.
  49 *
  50 * Per convention for normal use the port registers are visible.
  51 * If you need the data direction registers, restore the value in the
  52 * control register.
  53 */
  54
  55#include "multiface.h"
  56#include <linux/module.h>
  57#include <linux/init.h>
  58#include <linux/parport.h>
  59#include <linux/delay.h>
  60#include <linux/mc6821.h>
  61#include <linux/zorro.h>
  62#include <asm/setup.h>
  63#include <asm/amigahw.h>
  64#include <asm/irq.h>
  65#include <asm/amigaints.h>
  66
  67/* Maximum Number of Cards supported */
  68#define MAX_MFC 5
  69
  70#undef DEBUG
  71#ifdef DEBUG
  72#define DPRINTK printk
  73#else
  74static inline int DPRINTK(void *nothing, ...) {return 0;}
  75#endif
  76
  77static struct parport *this_port[MAX_MFC] = {NULL, };
  78static volatile int dummy; /* for trigger readds */
  79
  80#define pia(dev) ((struct pia *)(dev->base))
  81static struct parport_operations pp_mfc3_ops;
  82
  83static void mfc3_write_data(struct parport *p, unsigned char data)
  84{
  85DPRINTK(KERN_DEBUG "write_data %c\n",data);
  86
  87        dummy = pia(p)->pprb; /* clears irq bit */
  88        /* Triggers also /STROBE.*/
  89        pia(p)->pprb = data;
  90}
  91
  92static unsigned char mfc3_read_data(struct parport *p)
  93{
  94        /* clears interrupt bit. Triggers also /STROBE. */
  95        return pia(p)->pprb;
  96}
  97
  98static unsigned char control_pc_to_mfc3(unsigned char control)
  99{
 100        unsigned char ret = 32|64;
 101
 102        if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
 103                ret &= ~32; /* /SELECT_IN */
 104        if (control & PARPORT_CONTROL_INIT) /* INITP */
 105                ret |= 128;
 106        if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
 107                ret &= ~64;
 108        if (control & PARPORT_CONTROL_STROBE) /* Strobe */
 109                /* Handled directly by hardware */;
 110        return ret;
 111}
 112
 113static unsigned char control_mfc3_to_pc(unsigned char control)
 114{
 115        unsigned char ret = PARPORT_CONTROL_STROBE 
 116                          | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
 117
 118        if (control & 128) /* /INITP */
 119                ret |= PARPORT_CONTROL_INIT;
 120        if (control & 64) /* /AUTOLF */
 121                ret &= ~PARPORT_CONTROL_AUTOFD;
 122        if (control & 32) /* /SELECT_IN */
 123                ret &= ~PARPORT_CONTROL_SELECT;
 124        return ret;
 125}
 126
 127static void mfc3_write_control(struct parport *p, unsigned char control)
 128{
 129DPRINTK(KERN_DEBUG "write_control %02x\n",control);
 130        pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
 131}
 132        
 133static unsigned char mfc3_read_control( struct parport *p)
 134{
 135DPRINTK(KERN_DEBUG "read_control \n");
 136        return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
 137}
 138
 139static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 140{
 141        unsigned char old;
 142
 143DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
 144        old = mfc3_read_control(p);
 145        mfc3_write_control(p, (old & ~mask) ^ val);
 146        return old;
 147}
 148
 149#if 0 /* currently unused */
 150static unsigned char status_pc_to_mfc3(unsigned char status)
 151{
 152        unsigned char ret = 1;
 153
 154        if (status & PARPORT_STATUS_BUSY) /* Busy */
 155                ret &= ~1;
 156        if (status & PARPORT_STATUS_ACK) /* Ack */
 157                ret |= 8;
 158        if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
 159                ret |= 2;
 160        if (status & PARPORT_STATUS_SELECT) /* select */
 161                ret |= 4;
 162        if (status & PARPORT_STATUS_ERROR) /* error */
 163                ret |= 16;
 164        return ret;
 165}
 166#endif
 167
 168static unsigned char status_mfc3_to_pc(unsigned char status)
 169{
 170        unsigned char ret = PARPORT_STATUS_BUSY;
 171
 172        if (status & 1) /* Busy */
 173                ret &= ~PARPORT_STATUS_BUSY;
 174        if (status & 2) /* PaperOut */
 175                ret |= PARPORT_STATUS_PAPEROUT;
 176        if (status & 4) /* Selected */
 177                ret |= PARPORT_STATUS_SELECT;
 178        if (status & 8) /* Ack */
 179                ret |= PARPORT_STATUS_ACK;
 180        if (status & 16) /* /ERROR */
 181                ret |= PARPORT_STATUS_ERROR;
 182
 183        return ret;
 184}
 185
 186#if 0 /* currently unused */
 187static void mfc3_write_status( struct parport *p, unsigned char status)
 188{
 189DPRINTK(KERN_DEBUG "write_status %02x\n",status);
 190        pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
 191}
 192#endif
 193
 194static unsigned char mfc3_read_status(struct parport *p)
 195{
 196        unsigned char status;
 197
 198        status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
 199DPRINTK(KERN_DEBUG "read_status %02x\n", status);
 200        return status;
 201}
 202
 203#if 0 /* currently unused */
 204static void mfc3_change_mode( struct parport *p, int m)
 205{
 206        /* XXX: This port only has one mode, and I am
 207        not sure about the corresponding PC-style mode*/
 208}
 209#endif
 210
 211static int use_cnt = 0;
 212
 213static void mfc3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 214{
 215        int i;
 216
 217        for( i = 0; i < MAX_MFC; i++)
 218                if (this_port[i] != NULL)
 219                        if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
 220                                dummy = pia(this_port[i])->pprb; /* clear irq bit */
 221                                parport_generic_irq(irq, this_port[i], regs);
 222                        }
 223}
 224
 225static void mfc3_enable_irq(struct parport *p)
 226{
 227        pia(p)->crb |= PIA_C1_ENABLE_IRQ;
 228}
 229
 230static void mfc3_disable_irq(struct parport *p)
 231{
 232        pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
 233}
 234
 235static void mfc3_data_forward(struct parport *p)
 236{
 237        DPRINTK(KERN_DEBUG "forward\n");
 238        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 239        pia(p)->pddrb = 255; /* all pins output */
 240        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 241}
 242
 243static void mfc3_data_reverse(struct parport *p)
 244{
 245        DPRINTK(KERN_DEBUG "reverse\n");
 246        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 247        pia(p)->pddrb = 0; /* all pins input */
 248        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 249}
 250
 251static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
 252{
 253        s->u.amiga.data = 0;
 254        s->u.amiga.datadir = 255;
 255        s->u.amiga.status = 0;
 256        s->u.amiga.statusdir = 0xe0;
 257}
 258
 259static void mfc3_save_state(struct parport *p, struct parport_state *s)
 260{
 261        s->u.amiga.data = pia(p)->pprb;
 262        pia(p)->crb &= ~PIA_DDR;
 263        s->u.amiga.datadir = pia(p)->pddrb;
 264        pia(p)->crb |= PIA_DDR;
 265        s->u.amiga.status = pia(p)->ppra;
 266        pia(p)->cra &= ~PIA_DDR;
 267        s->u.amiga.statusdir = pia(p)->pddrb;
 268        pia(p)->cra |= PIA_DDR;
 269}
 270
 271static void mfc3_restore_state(struct parport *p, struct parport_state *s)
 272{
 273        pia(p)->pprb = s->u.amiga.data;
 274        pia(p)->crb &= ~PIA_DDR;
 275        pia(p)->pddrb = s->u.amiga.datadir;
 276        pia(p)->crb |= PIA_DDR;
 277        pia(p)->ppra = s->u.amiga.status;
 278        pia(p)->cra &= ~PIA_DDR;
 279        pia(p)->pddrb = s->u.amiga.statusdir;
 280        pia(p)->cra |= PIA_DDR;
 281}
 282
 283static void mfc3_inc_use_count(void)
 284{
 285        MOD_INC_USE_COUNT;
 286}
 287
 288static void mfc3_dec_use_count(void)
 289{
 290        MOD_DEC_USE_COUNT;
 291}
 292
 293static struct parport_operations pp_mfc3_ops = {
 294        mfc3_write_data,
 295        mfc3_read_data,
 296
 297        mfc3_write_control,
 298        mfc3_read_control,
 299        mfc3_frob_control,
 300
 301        mfc3_read_status,
 302
 303        mfc3_enable_irq,
 304        mfc3_disable_irq,
 305
 306        mfc3_data_forward, 
 307        mfc3_data_reverse, 
 308
 309        mfc3_init_state,
 310        mfc3_save_state,
 311        mfc3_restore_state,
 312
 313        mfc3_inc_use_count,
 314        mfc3_dec_use_count,
 315
 316        parport_ieee1284_epp_write_data,
 317        parport_ieee1284_epp_read_data,
 318        parport_ieee1284_epp_write_addr,
 319        parport_ieee1284_epp_read_addr,
 320
 321        parport_ieee1284_ecp_write_data,
 322        parport_ieee1284_ecp_read_data,
 323        parport_ieee1284_ecp_write_addr,
 324
 325        parport_ieee1284_write_compat,
 326        parport_ieee1284_read_nibble,
 327        parport_ieee1284_read_byte,
 328};
 329
 330/* ----------- Initialisation code --------------------------------- */
 331
 332int __init parport_mfc3_init(void)
 333{
 334        struct parport *p;
 335        int pias = 0;
 336        struct pia *pp;
 337        struct zorro_dev *z = NULL;
 338
 339        if (!MACH_IS_AMIGA)
 340                return -ENODEV;
 341
 342        while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
 343                unsigned long piabase = z->resource.start+PIABASE;
 344                if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
 345                        continue;
 346
 347                pp = (struct pia *)ZTWO_VADDR(piabase);
 348                pp->crb = 0;
 349                pp->pddrb = 255; /* all data pins output */
 350                pp->crb = PIA_DDR|32|8;
 351                dummy = pp->pddrb; /* reading clears interrupt */
 352                pp->cra = 0;
 353                pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */
 354                pp->cra = PIA_DDR;
 355                pp->ppra = 0; /* reset printer */
 356                udelay(10);
 357                pp->ppra = 128;
 358                p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
 359                                          PARPORT_DMA_NONE, &pp_mfc3_ops);
 360                if (!p)
 361                        goto out_port;
 362
 363                if (p->irq != PARPORT_IRQ_NONE) {
 364                        if (use_cnt++ == 0)
 365                                if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, SA_SHIRQ, p->name, &pp_mfc3_ops))
 366                                        goto out_irq;
 367                }
 368
 369                this_port[pias++] = p;
 370                printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
 371                /* XXX: set operating mode */
 372                parport_proc_register(p);
 373
 374                p->private_data = (void *)piabase;
 375                parport_announce_port (p);
 376
 377                if (pias >= MAX_MFC)
 378                        break;
 379                continue;
 380
 381        out_irq:
 382                parport_unregister_port(p);
 383        out_port:
 384                release_mem_region(piabase, sizeof(struct pia));
 385        }
 386
 387        return pias ? 0 : -ENODEV;
 388}
 389
 390void __exit parport_mfc3_exit(void)
 391{
 392        int i;
 393
 394        for (i = 0; i < MAX_MFC; i++) {
 395                if (!this_port[i])
 396                        continue;
 397                if (!this_port[i]->irq != PARPORT_IRQ_NONE) {
 398                        if (--use_cnt == 0) 
 399                                free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
 400                }
 401                parport_proc_unregister(this_port[i]);
 402                parport_unregister_port(this_port[i]);
 403                release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
 404        }
 405}
 406
 407
 408MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
 409MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port");
 410MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
 411MODULE_LICENSE("GPL");
 412
 413module_init(parport_mfc3_init)
 414module_exit(parport_mfc3_exit)
 415
 416