1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Low-level parallel port routines for the Multiface 3 card 3 * 4 * Author: Joerg Dorchain <joerg@dorchain.net> 5 * 6 * (C) The elitist m68k Users(TM) 7 * 8 * based on the existing parport_amiga and lp_mfc 9 * 10 * 11 * From the MFC3 documentation: 12 * 13 * Miscellaneous PIA Details 14 * ------------------------- 15 * 16 * The two open-drain interrupt outputs /IRQA and /IRQB are routed to 17 * /INT2 of the Z2 bus. 18 * 19 * The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2 20 * bus. This means that any PIA registers are accessed at even addresses. 21 * 22 * Centronics Pin Connections for the PIA 23 * -------------------------------------- 24 * 25 * The following table shows the connections between the PIA and the 26 * Centronics interface connector. These connections implement a single, but 27 * very complete, Centronics type interface. The Pin column gives the pin 28 * numbers of the PIA. The Centronics pin numbers can be found in the section 29 * "Parallel Connectors". 30 * 31 * 32 * Pin | PIA | Dir | Centronics Names 33 * -------+-----+-----+--------------------------------------------------------- 34 * 19 | CB2 | --> | /STROBE (aka /DRDY) 35 * 10-17 | PBx | <-> | DATA0 - DATA7 36 * 18 | CB1 | <-- | /ACK 37 * 40 | CA1 | <-- | BUSY 38 * 3 | PA1 | <-- | PAPER-OUT (aka POUT) 39 * 4 | PA2 | <-- | SELECTED (aka SEL) 40 * 9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME) 41 * 6 | PA4 | <-- | /ERROR (aka /FAULT) 42 * 7 | PA5 | --> | DIR (aka /SELECT-IN) 43 * 8 | PA6 | --> | /AUTO-FEED-XT 44 * 39 | CA2 | --> | open 45 * 5 | PA3 | <-- | /ACK (same as CB1!) 46 * 2 | PA0 | <-- | BUSY (same as CA1!) 47 * -------+-----+-----+--------------------------------------------------------- 48 * 49 * Should be enough to understand some of the driver. 50 * 51 * Per convention for normal use the port registers are visible. 52 * If you need the data direction registers, restore the value in the 53 * control register. 54 */ 55 56 #include "multiface.h" 57 #include <linux/module.h> 58 #include <linux/init.h> 59 #include <linux/parport.h> 60 #include <linux/delay.h> 61 #include <linux/mc6821.h> 62 #include <linux/zorro.h> 63 #include <linux/interrupt.h> 64 #include <asm/setup.h> 65 #include <asm/amigahw.h> 66 #include <asm/irq.h> 67 #include <asm/amigaints.h> 68 69 /* Maximum Number of Cards supported */ 70 #define MAX_MFC 5 71 72 #undef DEBUG 73 74 static struct parport *this_port[MAX_MFC] = {NULL, }; 75 static volatile int dummy; /* for trigger readds */ 76 77 #define pia(dev) ((struct pia *)(dev->base)) 78 static struct parport_operations pp_mfc3_ops; 79 80 static void mfc3_write_data(struct parport *p, unsigned char data) 81 { 82 pr_debug("write_data %c\n", data); 83 84 dummy = pia(p)->pprb; /* clears irq bit */ 85 /* Triggers also /STROBE.*/ 86 pia(p)->pprb = data; 87 } 88 89 static unsigned char mfc3_read_data(struct parport *p) 90 { 91 /* clears interrupt bit. Triggers also /STROBE. */ 92 return pia(p)->pprb; 93 } 94 95 static unsigned char control_pc_to_mfc3(unsigned char control) 96 { 97 unsigned char ret = 32|64; 98 99 if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ 100 ret &= ~32; /* /SELECT_IN */ 101 if (control & PARPORT_CONTROL_INIT) /* INITP */ 102 ret |= 128; 103 if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ 104 ret &= ~64; 105 if (control & PARPORT_CONTROL_STROBE) /* Strobe */ 106 /* Handled directly by hardware */; 107 return ret; 108 } 109 110 static unsigned char control_mfc3_to_pc(unsigned char control) 111 { 112 unsigned char ret = PARPORT_CONTROL_STROBE 113 | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT; 114 115 if (control & 128) /* /INITP */ 116 ret |= PARPORT_CONTROL_INIT; 117 if (control & 64) /* /AUTOLF */ 118 ret &= ~PARPORT_CONTROL_AUTOFD; 119 if (control & 32) /* /SELECT_IN */ 120 ret &= ~PARPORT_CONTROL_SELECT; 121 return ret; 122 } 123 124 static void mfc3_write_control(struct parport *p, unsigned char control) 125 { 126 pr_debug("write_control %02x\n", control); 127 pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control); 128 } 129 130 static unsigned char mfc3_read_control( struct parport *p) 131 { 132 pr_debug("read_control\n"); 133 return control_mfc3_to_pc(pia(p)->ppra & 0xe0); 134 } 135 136 static unsigned char mfc3_frob_control( struct parport *p, unsigned char mask, unsigned char val) 137 { 138 unsigned char old; 139 140 pr_debug("frob_control mask %02x, value %02x\n", mask, val); 141 old = mfc3_read_control(p); 142 mfc3_write_control(p, (old & ~mask) ^ val); 143 return old; 144 } 145 146 static unsigned char status_mfc3_to_pc(unsigned char status) 147 { 148 unsigned char ret = PARPORT_STATUS_BUSY; 149 150 if (status & 1) /* Busy */ 151 ret &= ~PARPORT_STATUS_BUSY; 152 if (status & 2) /* PaperOut */ 153 ret |= PARPORT_STATUS_PAPEROUT; 154 if (status & 4) /* Selected */ 155 ret |= PARPORT_STATUS_SELECT; 156 if (status & 8) /* Ack */ 157 ret |= PARPORT_STATUS_ACK; 158 if (status & 16) /* /ERROR */ 159 ret |= PARPORT_STATUS_ERROR; 160 161 return ret; 162 } 163 164 static unsigned char mfc3_read_status(struct parport *p) 165 { 166 unsigned char status; 167 168 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); 169 pr_debug("read_status %02x\n", status); 170 return status; 171 } 172 173 static int use_cnt; 174 175 static irqreturn_t mfc3_interrupt(int irq, void *dev_id) 176 { 177 int i; 178 179 for( i = 0; i < MAX_MFC; i++) 180 if (this_port[i] != NULL) 181 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ 182 dummy = pia(this_port[i])->pprb; /* clear irq bit */ 183 parport_generic_irq(this_port[i]); 184 } 185 return IRQ_HANDLED; 186 } 187 188 static void mfc3_enable_irq(struct parport *p) 189 { 190 pia(p)->crb |= PIA_C1_ENABLE_IRQ; 191 } 192 193 static void mfc3_disable_irq(struct parport *p) 194 { 195 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; 196 } 197 198 static void mfc3_data_forward(struct parport *p) 199 { 200 pr_debug("forward\n"); 201 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 202 pia(p)->pddrb = 255; /* all pins output */ 203 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 204 } 205 206 static void mfc3_data_reverse(struct parport *p) 207 { 208 pr_debug("reverse\n"); 209 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 210 pia(p)->pddrb = 0; /* all pins input */ 211 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 212 } 213 214 static void mfc3_init_state(struct pardevice *dev, struct parport_state *s) 215 { 216 s->u.amiga.data = 0; 217 s->u.amiga.datadir = 255; 218 s->u.amiga.status = 0; 219 s->u.amiga.statusdir = 0xe0; 220 } 221 222 static void mfc3_save_state(struct parport *p, struct parport_state *s) 223 { 224 s->u.amiga.data = pia(p)->pprb; 225 pia(p)->crb &= ~PIA_DDR; 226 s->u.amiga.datadir = pia(p)->pddrb; 227 pia(p)->crb |= PIA_DDR; 228 s->u.amiga.status = pia(p)->ppra; 229 pia(p)->cra &= ~PIA_DDR; 230 s->u.amiga.statusdir = pia(p)->pddrb; 231 pia(p)->cra |= PIA_DDR; 232 } 233 234 static void mfc3_restore_state(struct parport *p, struct parport_state *s) 235 { 236 pia(p)->pprb = s->u.amiga.data; 237 pia(p)->crb &= ~PIA_DDR; 238 pia(p)->pddrb = s->u.amiga.datadir; 239 pia(p)->crb |= PIA_DDR; 240 pia(p)->ppra = s->u.amiga.status; 241 pia(p)->cra &= ~PIA_DDR; 242 pia(p)->pddrb = s->u.amiga.statusdir; 243 pia(p)->cra |= PIA_DDR; 244 } 245 246 static struct parport_operations pp_mfc3_ops = { 247 .write_data = mfc3_write_data, 248 .read_data = mfc3_read_data, 249 250 .write_control = mfc3_write_control, 251 .read_control = mfc3_read_control, 252 .frob_control = mfc3_frob_control, 253 254 .read_status = mfc3_read_status, 255 256 .enable_irq = mfc3_enable_irq, 257 .disable_irq = mfc3_disable_irq, 258 259 .data_forward = mfc3_data_forward, 260 .data_reverse = mfc3_data_reverse, 261 262 .init_state = mfc3_init_state, 263 .save_state = mfc3_save_state, 264 .restore_state = mfc3_restore_state, 265 266 .epp_write_data = parport_ieee1284_epp_write_data, 267 .epp_read_data = parport_ieee1284_epp_read_data, 268 .epp_write_addr = parport_ieee1284_epp_write_addr, 269 .epp_read_addr = parport_ieee1284_epp_read_addr, 270 271 .ecp_write_data = parport_ieee1284_ecp_write_data, 272 .ecp_read_data = parport_ieee1284_ecp_read_data, 273 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 274 275 .compat_write_data = parport_ieee1284_write_compat, 276 .nibble_read_data = parport_ieee1284_read_nibble, 277 .byte_read_data = parport_ieee1284_read_byte, 278 279 .owner = THIS_MODULE, 280 }; 281 282 /* ----------- Initialisation code --------------------------------- */ 283 284 static int __init parport_mfc3_init(void) 285 { 286 struct parport *p; 287 int pias = 0; 288 struct pia *pp; 289 struct zorro_dev *z = NULL; 290 291 if (!MACH_IS_AMIGA) 292 return -ENODEV; 293 294 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { 295 unsigned long piabase = z->resource.start+PIABASE; 296 if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) 297 continue; 298 299 pp = ZTWO_VADDR(piabase); 300 pp->crb = 0; 301 pp->pddrb = 255; /* all data pins output */ 302 pp->crb = PIA_DDR|32|8; 303 dummy = pp->pddrb; /* reading clears interrupt */ 304 pp->cra = 0; 305 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ 306 pp->cra = PIA_DDR; 307 pp->ppra = 0; /* reset printer */ 308 udelay(10); 309 pp->ppra = 128; 310 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, 311 PARPORT_DMA_NONE, &pp_mfc3_ops); 312 if (!p) 313 goto out_port; 314 315 if (p->irq != PARPORT_IRQ_NONE) { 316 if (use_cnt++ == 0) 317 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) 318 goto out_irq; 319 } 320 p->dev = &z->dev; 321 322 this_port[pias++] = p; 323 pr_info("%s: Multiface III port using irq\n", p->name); 324 /* XXX: set operating mode */ 325 326 p->private_data = (void *)piabase; 327 parport_announce_port (p); 328 329 if (pias >= MAX_MFC) 330 break; 331 continue; 332 333 out_irq: 334 parport_put_port(p); 335 out_port: 336 release_mem_region(piabase, sizeof(struct pia)); 337 } 338 339 return pias ? 0 : -ENODEV; 340 } 341 342 static void __exit parport_mfc3_exit(void) 343 { 344 int i; 345 346 for (i = 0; i < MAX_MFC; i++) { 347 if (!this_port[i]) 348 continue; 349 parport_remove_port(this_port[i]); 350 if (this_port[i]->irq != PARPORT_IRQ_NONE) { 351 if (--use_cnt == 0) 352 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); 353 } 354 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); 355 parport_put_port(this_port[i]); 356 } 357 } 358 359 360 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 361 MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port"); 362 MODULE_LICENSE("GPL"); 363 364 module_init(parport_mfc3_init) 365 module_exit(parport_mfc3_exit) 366