drivers/parport/parport_mfc3.c

   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
  75 static inline int DPRINTK(void *nothing, ...) {return 0;}
  76 #endif
  77
  78 static struct parport *this_port[MAX_MFC] = {NULL, };
  79 static volatile int dummy; /* for trigger readds */
  80
  81 #define pia(dev) ((struct pia *)(dev->base))
  82 static struct parport_operations pp_mfc3_ops;
  83
  84 static void mfc3_write_data(struct parport *p, unsigned char data)
  85 {
  86 DPRINTK(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
  93 static unsigned char mfc3_read_data(struct parport *p)
  94 {
  95         /* clears interrupt bit. Triggers also /STROBE. */
  96         return pia(p)->pprb;
  97 }
  98
  99 static 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
 114 static 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
 128 static void mfc3_write_control(struct parport *p, unsigned char control)
 129 {
 130 DPRINTK(KERN_DEBUG "write_control %02x\n",control);
 131         pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control);
 132 }
 133
 134 static unsigned char mfc3_read_control( struct parport *p)
 135 {
 136 DPRINTK(KERN_DEBUG "read_control \n");
 137         return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
 138 }
 139
 140 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 141 {
 142         unsigned char old;
 143
 144 DPRINTK(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
 150 static 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
 168 static unsigned char mfc3_read_status(struct parport *p)
 169 {
 170         unsigned char status;
 171
 172         status = status_mfc3_to_pc(pia(p)->ppra & 0x1f);
 173 DPRINTK(KERN_DEBUG "read_status %02x\n", status);
 174         return status;
 175 }
 176
 177 static int use_cnt;
 178
 179 static 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
 192 static void mfc3_enable_irq(struct parport *p)
 193 {
 194         pia(p)->crb |= PIA_C1_ENABLE_IRQ;
 195 }
 196
 197 static void mfc3_disable_irq(struct parport *p)
 198 {
 199         pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
 200 }
 201
 202 static 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
 210 static 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
 218 static 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
 226 static 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
 238 static 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
 250 static 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
 288 static 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 = 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
 346 static 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
 364 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
 365 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port");
 366 MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port");
 367 MODULE_LICENSE("GPL");
 368
 369 module_init(parport_mfc3_init)
 370 module_exit(parport_mfc3_exit)