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 = 0; 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) 371