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) 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 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} 167 168 169static unsigned char mfc3_read_status(struct parport *p) 170{ 171 unsigned char status; 172 173 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); 174DPRINTK(KERN_DEBUG "read_status %02x\n", status); 175 return status; 176} 177 178 179static int use_cnt = 0; 180 181static void mfc3_interrupt(int irq, void *dev_id, struct pt_regs *regs) 182{ 183 int i; 184 185 for( i = 0; i < MAX_MFC; i++) 186 if (this_port[i] != NULL) 187 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ 188 dummy = pia(this_port[i])->pprb; /* clear irq bit */ 189 parport_generic_irq(irq, this_port[i], regs); 190 } 191} 192 193static void mfc3_enable_irq(struct parport *p) 194{ 195 pia(p)->crb |= PIA_C1_ENABLE_IRQ; 196} 197 198static void mfc3_disable_irq(struct parport *p) 199{ 200 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; 201} 202 203static void mfc3_data_forward(struct parport *p) 204{ 205 DPRINTK(KERN_DEBUG "forward\n"); 206 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 207 pia(p)->pddrb = 255; /* all pins output */ 208 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 209} 210 211static void mfc3_data_reverse(struct parport *p) 212{ 213 DPRINTK(KERN_DEBUG "reverse\n"); 214 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 215 pia(p)->pddrb = 0; /* all pins input */ 216 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 217} 218 219static void mfc3_init_state(struct pardevice *dev, struct parport_state *s) 220{ 221 s->u.amiga.data = 0; 222 s->u.amiga.datadir = 255; 223 s->u.amiga.status = 0; 224 s->u.amiga.statusdir = 0xe0; 225} 226 227static void mfc3_save_state(struct parport *p, struct parport_state *s) 228{ 229 s->u.amiga.data = pia(p)->pprb; 230 pia(p)->crb &= ~PIA_DDR; 231 s->u.amiga.datadir = pia(p)->pddrb; 232 pia(p)->crb |= PIA_DDR; 233 s->u.amiga.status = pia(p)->ppra; 234 pia(p)->cra &= ~PIA_DDR; 235 s->u.amiga.statusdir = pia(p)->pddrb; 236 pia(p)->cra |= PIA_DDR; 237} 238 239static void mfc3_restore_state(struct parport *p, struct parport_state *s) 240{ 241 pia(p)->pprb = s->u.amiga.data; 242 pia(p)->crb &= ~PIA_DDR; 243 pia(p)->pddrb = s->u.amiga.datadir; 244 pia(p)->crb |= PIA_DDR; 245 pia(p)->ppra = s->u.amiga.status; 246 pia(p)->cra &= ~PIA_DDR; 247 pia(p)->pddrb = s->u.amiga.statusdir; 248 pia(p)->cra |= PIA_DDR; 249} 250 251static void mfc3_inc_use_count(void) 252{ 253 MOD_INC_USE_COUNT; 254} 255 256static void mfc3_dec_use_count(void) 257{ 258 MOD_DEC_USE_COUNT; 259} 260 261static struct parport_operations pp_mfc3_ops = { 262 mfc3_write_data, 263 mfc3_read_data, 264 265 mfc3_write_control, 266 mfc3_read_control, 267 mfc3_frob_control, 268 269 mfc3_read_status, 270 271 mfc3_enable_irq, 272 mfc3_disable_irq, 273 274 mfc3_data_forward, 275 mfc3_data_reverse, 276 277 mfc3_init_state, 278 mfc3_save_state, 279 mfc3_restore_state, 280 281 mfc3_inc_use_count, 282 mfc3_dec_use_count, 283 284 parport_ieee1284_epp_write_data, 285 parport_ieee1284_epp_read_data, 286 parport_ieee1284_epp_write_addr, 287 parport_ieee1284_epp_read_addr, 288 289 parport_ieee1284_ecp_write_data, 290 parport_ieee1284_ecp_read_data, 291 parport_ieee1284_ecp_write_addr, 292 293 parport_ieee1284_write_compat, 294 parport_ieee1284_read_nibble, 295 parport_ieee1284_read_byte, 296}; 297 298/* ----------- Initialisation code --------------------------------- */ 299 300int __init parport_mfc3_init(void) 301{ 302 struct parport *p; 303 int pias = 0; 304 struct pia *pp; 305 struct zorro_dev *z = NULL; 306 307 if (!MACH_IS_AMIGA) 308 return -ENODEV; 309 310 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { 311 unsigned long piabase = z->resource.start+PIABASE; 312 if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) 313 continue; 314 315 pp = (struct pia *)ZTWO_VADDR(piabase); 316 pp->crb = 0; 317 pp->pddrb = 255; /* all data pins output */ 318 pp->crb = PIA_DDR|32|8; 319 dummy = pp->pddrb; /* reading clears interrupt */ 320 pp->cra = 0; 321 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ 322 pp->cra = PIA_DDR; 323 pp->ppra = 0; /* reset printer */ 324 udelay(10); 325 pp->ppra = 128; 326 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, 327 PARPORT_DMA_NONE, &pp_mfc3_ops); 328 if (!p) 329 goto out_port; 330 331 if (p->irq != PARPORT_IRQ_NONE) { 332 if (use_cnt++ == 0) 333 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, SA_SHIRQ, p->name, &pp_mfc3_ops)) 334 goto out_irq; 335 } 336 337 this_port[pias++] = p; 338 printk(KERN_INFO "%s: Multiface III port using irq\n", p->name); 339 parport_proc_register(p); 340 341 p->private_data = (void *)piabase; 342 parport_announce_port (p); 343 344 if (pias >= MAX_MFC) 345 break; 346 continue; 347 348 out_irq: 349 parport_unregister_port(p); 350 out_port: 351 release_mem_region(piabase, sizeof(struct pia)); 352 } 353 354 return pias ? 0 : -ENODEV; 355} 356 357void __exit parport_mfc3_exit(void) 358{ 359 int i; 360 361 for (i = 0; i < MAX_MFC; i++) { 362 if (!this_port[i]) 363 continue; 364 if (!this_port[i]->irq != PARPORT_IRQ_NONE) { 365 if (--use_cnt == 0) 366 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); 367 } 368 parport_proc_unregister(this_port[i]); 369 parport_unregister_port(this_port[i]); 370 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); 371 } 372} 373 374 375MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 376MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port"); 377MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port"); 378MODULE_LICENSE("GPL"); 379 380module_init(parport_mfc3_init) 381module_exit(parport_mfc3_exit) 382 383