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) 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} 149 150 151static unsigned char status_mfc3_to_pc(unsigned char status) 152{ 153 unsigned char ret = PARPORT_STATUS_BUSY; 154 155 if (status & 1) /* Busy */ 156 ret &= ~PARPORT_STATUS_BUSY; 157 if (status & 2) /* PaperOut */ 158 ret |= PARPORT_STATUS_PAPEROUT; 159 if (status & 4) /* Selected */ 160 ret |= PARPORT_STATUS_SELECT; 161 if (status & 8) /* Ack */ 162 ret |= PARPORT_STATUS_ACK; 163 if (status & 16) /* /ERROR */ 164 ret |= PARPORT_STATUS_ERROR; 165 166 return ret; 167} 168 169 170static unsigned char mfc3_read_status(struct parport *p) 171{ 172 unsigned char status; 173 174 status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); 175DPRINTK(KERN_DEBUG "read_status %02x\n", status); 176 return status; 177} 178 179 180static int use_cnt = 0; 181 182static irqreturn_t mfc3_interrupt(int irq, void *dev_id) 183{ 184 int i; 185 186 for( i = 0; i < MAX_MFC; i++) 187 if (this_port[i] != NULL) 188 if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ 189 dummy = pia(this_port[i])->pprb; /* clear irq bit */ 190 parport_generic_irq(this_port[i]); 191 } 192 return IRQ_HANDLED; 193} 194 195static void mfc3_enable_irq(struct parport *p) 196{ 197 pia(p)->crb |= PIA_C1_ENABLE_IRQ; 198} 199 200static void mfc3_disable_irq(struct parport *p) 201{ 202 pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; 203} 204 205static void mfc3_data_forward(struct parport *p) 206{ 207 DPRINTK(KERN_DEBUG "forward\n"); 208 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 209 pia(p)->pddrb = 255; /* all pins output */ 210 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 211} 212 213static void mfc3_data_reverse(struct parport *p) 214{ 215 DPRINTK(KERN_DEBUG "reverse\n"); 216 pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ 217 pia(p)->pddrb = 0; /* all pins input */ 218 pia(p)->crb |= PIA_DDR; /* make data register visible - default */ 219} 220 221static void mfc3_init_state(struct pardevice *dev, struct parport_state *s) 222{ 223 s->u.amiga.data = 0; 224 s->u.amiga.datadir = 255; 225 s->u.amiga.status = 0; 226 s->u.amiga.statusdir = 0xe0; 227} 228 229static void mfc3_save_state(struct parport *p, struct parport_state *s) 230{ 231 s->u.amiga.data = pia(p)->pprb; 232 pia(p)->crb &= ~PIA_DDR; 233 s->u.amiga.datadir = pia(p)->pddrb; 234 pia(p)->crb |= PIA_DDR; 235 s->u.amiga.status = pia(p)->ppra; 236 pia(p)->cra &= ~PIA_DDR; 237 s->u.amiga.statusdir = pia(p)->pddrb; 238 pia(p)->cra |= PIA_DDR; 239} 240 241static void mfc3_restore_state(struct parport *p, struct parport_state *s) 242{ 243 pia(p)->pprb = s->u.amiga.data; 244 pia(p)->crb &= ~PIA_DDR; 245 pia(p)->pddrb = s->u.amiga.datadir; 246 pia(p)->crb |= PIA_DDR; 247 pia(p)->ppra = s->u.amiga.status; 248 pia(p)->cra &= ~PIA_DDR; 249 pia(p)->pddrb = s->u.amiga.statusdir; 250 pia(p)->cra |= PIA_DDR; 251} 252 253static struct parport_operations pp_mfc3_ops = { 254 .write_data = mfc3_write_data, 255 .read_data = mfc3_read_data, 256 257 .write_control = mfc3_write_control, 258 .read_control = mfc3_read_control, 259 .frob_control = mfc3_frob_control, 260 261 .read_status = mfc3_read_status, 262 263 .enable_irq = mfc3_enable_irq, 264 .disable_irq = mfc3_disable_irq, 265 266 .data_forward = mfc3_data_forward, 267 .data_reverse = mfc3_data_reverse, 268 269 .init_state = mfc3_init_state, 270 .save_state = mfc3_save_state, 271 .restore_state = mfc3_restore_state, 272 273 .epp_write_data = parport_ieee1284_epp_write_data, 274 .epp_read_data = parport_ieee1284_epp_read_data, 275 .epp_write_addr = parport_ieee1284_epp_write_addr, 276 .epp_read_addr = parport_ieee1284_epp_read_addr, 277 278 .ecp_write_data = parport_ieee1284_ecp_write_data, 279 .ecp_read_data = parport_ieee1284_ecp_read_data, 280 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 281 282 .compat_write_data = parport_ieee1284_write_compat, 283 .nibble_read_data = parport_ieee1284_read_nibble, 284 .byte_read_data = parport_ieee1284_read_byte, 285 286 .owner = THIS_MODULE, 287}; 288 289/* ----------- Initialisation code --------------------------------- */ 290 291static int __init parport_mfc3_init(void) 292{ 293 struct parport *p; 294 int pias = 0; 295 struct pia *pp; 296 struct zorro_dev *z = NULL; 297 298 if (!MACH_IS_AMIGA) 299 return -ENODEV; 300 301 while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { 302 unsigned long piabase = z->resource.start+PIABASE; 303 if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) 304 continue; 305 306 pp = (struct pia *)ZTWO_VADDR(piabase); 307 pp->crb = 0; 308 pp->pddrb = 255; /* all data pins output */ 309 pp->crb = PIA_DDR|32|8; 310 dummy = pp->pddrb; /* reading clears interrupt */ 311 pp->cra = 0; 312 pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ 313 pp->cra = PIA_DDR; 314 pp->ppra = 0; /* reset printer */ 315 udelay(10); 316 pp->ppra = 128; 317 p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, 318 PARPORT_DMA_NONE, &pp_mfc3_ops); 319 if (!p) 320 goto out_port; 321 322 if (p->irq != PARPORT_IRQ_NONE) { 323 if (use_cnt++ == 0) 324 if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) 325 goto out_irq; 326 } 327 p->dev = &z->dev; 328 329 this_port[pias++] = p; 330 printk(KERN_INFO "%s: Multiface III port using irq\n", p->name); 331 332 p->private_data = (void *)piabase; 333 parport_announce_port (p); 334 335 if (pias >= MAX_MFC) 336 break; 337 continue; 338 339 out_irq: 340 parport_put_port(p); 341 out_port: 342 release_mem_region(piabase, sizeof(struct pia)); 343 } 344 345 return pias ? 0 : -ENODEV; 346} 347 348static void __exit parport_mfc3_exit(void) 349{ 350 int i; 351 352 for (i = 0; i < MAX_MFC; i++) { 353 if (!this_port[i]) 354 continue; 355 parport_remove_port(this_port[i]); 356 if (this_port[i]->irq != PARPORT_IRQ_NONE) { 357 if (--use_cnt == 0) 358 free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); 359 } 360 release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); 361 parport_put_port(this_port[i]); 362 } 363} 364 365 366MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 367MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port"); 368MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port"); 369MODULE_LICENSE("GPL"); 370 371module_init(parport_mfc3_init) 372module_exit(parport_mfc3_exit) 373