linux/drivers/parport/parport_mfc3.c
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   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 <linux/interrupt.h>
  63#include <asm/setup.h>
  64#include <asm/amigahw.h>
  65#include <asm/irq.h>
  66#include <asm/amigaints.h>
  67
  68/* Maximum Number of Cards supported */
  69#define MAX_MFC 5
  70
  71#undef DEBUG
  72#ifdef DEBUG
  73#define DPRINTK printk
  74#else
  75static inline int DPRINTK(void *nothing, ...) {return 0;}
  76#endif
  77
  78static struct parport *this_port[MAX_MFC] = {NULL, };
  79static volatile int dummy; /* for trigger readds */
  80
  81#define pia(dev) ((struct pia *)(dev->base))
  82static struct parport_operations pp_mfc3_ops;
  83
  84static void mfc3_write_data(struct parport *p, unsigned char data)
  85{
  86DPRINTK(KERN_DEBUG "write_data %c\n",data);
  87
  88        dummy = pia(p)->pprb; /* clears irq bit */
  89        /* Triggers also /STROBE.*/
  90        pia(p)->pprb = data;
  91}
  92
  93static unsigned char mfc3_read_data(struct parport *p)
  94{
  95        /* clears interrupt bit. Triggers also /STROBE. */
  96        return pia(p)->pprb;
  97}
  98
  99static unsigned char control_pc_to_mfc3(unsigned char control)
 100{
 101        unsigned char ret = 32|64;
 102
 103        if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */
 104                ret &= ~32; /* /SELECT_IN */
 105        if (control & PARPORT_CONTROL_INIT) /* INITP */
 106                ret |= 128;
 107        if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */
 108                ret &= ~64;
 109        if (control & PARPORT_CONTROL_STROBE) /* Strobe */
 110                /* Handled directly by hardware */;
 111        return ret;
 112}
 113
 114static unsigned char control_mfc3_to_pc(unsigned char control)
 115{
 116        unsigned char ret = PARPORT_CONTROL_STROBE 
 117                          | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT;
 118
 119        if (control & 128) /* /INITP */
 120                ret |= PARPORT_CONTROL_INIT;
 121        if (control & 64) /* /AUTOLF */
 122                ret &= ~PARPORT_CONTROL_AUTOFD;
 123        if (control & 32) /* /SELECT_IN */
 124                ret &= ~PARPORT_CONTROL_SELECT;
 125        return ret;
 126}
 127
 128static void mfc3_write_control(struct parport *p, unsigned char control)
 129{
 130DPRINTK(KERN_DEBUG "write_control %02x\n",control);
 131        pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
 132}
 133        
 134static unsigned char mfc3_read_control( struct parport *p)
 135{
 136DPRINTK(KERN_DEBUG "read_control \n");
 137        return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
 138}
 139
 140static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 141{
 142        unsigned char old;
 143
 144DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
 145        old = mfc3_read_control(p);
 146        mfc3_write_control(p, (old & ~mask) ^ val);
 147        return old;
 148}
 149
 150static unsigned char status_mfc3_to_pc(unsigned char status)
 151{
 152        unsigned char ret = PARPORT_STATUS_BUSY;
 153
 154        if (status & 1) /* Busy */
 155                ret &= ~PARPORT_STATUS_BUSY;
 156        if (status & 2) /* PaperOut */
 157                ret |= PARPORT_STATUS_PAPEROUT;
 158        if (status & 4) /* Selected */
 159                ret |= PARPORT_STATUS_SELECT;
 160        if (status & 8) /* Ack */
 161                ret |= PARPORT_STATUS_ACK;
 162        if (status & 16) /* /ERROR */
 163                ret |= PARPORT_STATUS_ERROR;
 164
 165        return ret;
 166}
 167
 168static unsigned char mfc3_read_status(struct parport *p)
 169{
 170        unsigned char status;
 171
 172        status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
 173DPRINTK(KERN_DEBUG "read_status %02x\n", status);
 174        return status;
 175}
 176
 177static int use_cnt = 0;
 178
 179static irqreturn_t mfc3_interrupt(int irq, void *dev_id)
 180{
 181        int i;
 182
 183        for( i = 0; i < MAX_MFC; i++)
 184                if (this_port[i] != NULL)
 185                        if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */
 186                                dummy = pia(this_port[i])->pprb; /* clear irq bit */
 187                                parport_generic_irq(this_port[i]);
 188                        }
 189        return IRQ_HANDLED;
 190}
 191
 192static void mfc3_enable_irq(struct parport *p)
 193{
 194        pia(p)->crb |= PIA_C1_ENABLE_IRQ;
 195}
 196
 197static void mfc3_disable_irq(struct parport *p)
 198{
 199        pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
 200}
 201
 202static void mfc3_data_forward(struct parport *p)
 203{
 204        DPRINTK(KERN_DEBUG "forward\n");
 205        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 206        pia(p)->pddrb = 255; /* all pins output */
 207        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 208}
 209
 210static void mfc3_data_reverse(struct parport *p)
 211{
 212        DPRINTK(KERN_DEBUG "reverse\n");
 213        pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */
 214        pia(p)->pddrb = 0; /* all pins input */
 215        pia(p)->crb |= PIA_DDR; /* make data register visible - default */
 216}
 217
 218static void mfc3_init_state(struct pardevice *dev, struct parport_state *s)
 219{
 220        s->u.amiga.data = 0;
 221        s->u.amiga.datadir = 255;
 222        s->u.amiga.status = 0;
 223        s->u.amiga.statusdir = 0xe0;
 224}
 225
 226static void mfc3_save_state(struct parport *p, struct parport_state *s)
 227{
 228        s->u.amiga.data = pia(p)->pprb;
 229        pia(p)->crb &= ~PIA_DDR;
 230        s->u.amiga.datadir = pia(p)->pddrb;
 231        pia(p)->crb |= PIA_DDR;
 232        s->u.amiga.status = pia(p)->ppra;
 233        pia(p)->cra &= ~PIA_DDR;
 234        s->u.amiga.statusdir = pia(p)->pddrb;
 235        pia(p)->cra |= PIA_DDR;
 236}
 237
 238static void mfc3_restore_state(struct parport *p, struct parport_state *s)
 239{
 240        pia(p)->pprb = s->u.amiga.data;
 241        pia(p)->crb &= ~PIA_DDR;
 242        pia(p)->pddrb = s->u.amiga.datadir;
 243        pia(p)->crb |= PIA_DDR;
 244        pia(p)->ppra = s->u.amiga.status;
 245        pia(p)->cra &= ~PIA_DDR;
 246        pia(p)->pddrb = s->u.amiga.statusdir;
 247        pia(p)->cra |= PIA_DDR;
 248}
 249
 250static struct parport_operations pp_mfc3_ops = {
 251        .write_data     = mfc3_write_data,
 252        .read_data      = mfc3_read_data,
 253
 254        .write_control  = mfc3_write_control,
 255        .read_control   = mfc3_read_control,
 256        .frob_control   = mfc3_frob_control,
 257
 258        .read_status    = mfc3_read_status,
 259
 260        .enable_irq     = mfc3_enable_irq,
 261        .disable_irq    = mfc3_disable_irq,
 262
 263        .data_forward   = mfc3_data_forward, 
 264        .data_reverse   = mfc3_data_reverse, 
 265
 266        .init_state     = mfc3_init_state,
 267        .save_state     = mfc3_save_state,
 268        .restore_state  = mfc3_restore_state,
 269
 270        .epp_write_data = parport_ieee1284_epp_write_data,
 271        .epp_read_data  = parport_ieee1284_epp_read_data,
 272        .epp_write_addr = parport_ieee1284_epp_write_addr,
 273        .epp_read_addr  = parport_ieee1284_epp_read_addr,
 274
 275        .ecp_write_data = parport_ieee1284_ecp_write_data,
 276        .ecp_read_data  = parport_ieee1284_ecp_read_data,
 277        .ecp_write_addr = parport_ieee1284_ecp_write_addr,
 278
 279        .compat_write_data      = parport_ieee1284_write_compat,
 280        .nibble_read_data       = parport_ieee1284_read_nibble,
 281        .byte_read_data         = parport_ieee1284_read_byte,
 282
 283        .owner          = THIS_MODULE,
 284};
 285
 286/* ----------- Initialisation code --------------------------------- */
 287
 288static int __init parport_mfc3_init(void)
 289{
 290        struct parport *p;
 291        int pias = 0;
 292        struct pia *pp;
 293        struct zorro_dev *z = NULL;
 294
 295        if (!MACH_IS_AMIGA)
 296                return -ENODEV;
 297
 298        while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) {
 299                unsigned long piabase = z->resource.start+PIABASE;
 300                if (!request_mem_region(piabase, sizeof(struct pia), "PIA"))
 301                        continue;
 302
 303                pp = (struct pia *)ZTWO_VADDR(piabase);
 304                pp->crb = 0;
 305                pp->pddrb = 255; /* all data pins output */
 306                pp->crb = PIA_DDR|32|8;
 307                dummy = pp->pddrb; /* reading clears interrupt */
 308                pp->cra = 0;
 309                pp->pddra = 0xe0; /* /RESET,  /DIR ,/AUTO-FEED output */
 310                pp->cra = PIA_DDR;
 311                pp->ppra = 0; /* reset printer */
 312                udelay(10);
 313                pp->ppra = 128;
 314                p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS,
 315                                          PARPORT_DMA_NONE, &pp_mfc3_ops);
 316                if (!p)
 317                        goto out_port;
 318
 319                if (p->irq != PARPORT_IRQ_NONE) {
 320                        if (use_cnt++ == 0)
 321                                if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
 322                                        goto out_irq;
 323                }
 324                p->dev = &z->dev;
 325
 326                this_port[pias++] = p;
 327                printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
 328                /* XXX: set operating mode */
 329
 330                p->private_data = (void *)piabase;
 331                parport_announce_port (p);
 332
 333                if (pias >= MAX_MFC)
 334                        break;
 335                continue;
 336
 337        out_irq:
 338                parport_put_port(p);
 339        out_port:
 340                release_mem_region(piabase, sizeof(struct pia));
 341        }
 342
 343        return pias ? 0 : -ENODEV;
 344}
 345
 346static void __exit parport_mfc3_exit(void)
 347{
 348        int i;
 349
 350        for (i = 0; i < MAX_MFC; i++) {
 351                if (!this_port[i])
 352                        continue;
 353                parport_remove_port(this_port[i]);
 354                if (this_port[i]->irq != PARPORT_IRQ_NONE) {
 355                        if (--use_cnt == 0) 
 356                                free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops);
 357                }
 358                release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia));
 359                parport_put_port(this_port[i]);
 360        }
 361}
 362
 363
 364MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
 365MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
 366MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
 367MODULE_LICENSE("GPL");
 368
 369module_init(parport_mfc3_init)
 370module_exit(parport_mfc3_exit)
 371
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