1 /* 2 * 6522 Versatile Interface Adapter (VIA) 3 * 4 * There are two of these on the Mac II. Some IRQ's are vectored 5 * via them as are assorted bits and bobs - eg RTC, ADB. 6 * 7 * CSA: Motorola seems to have removed documentation on the 6522 from 8 * their web site; try 9 * http://nerini.drf.com/vectrex/other/text/chips/6522/ 10 * http://www.zymurgy.net/classic/vic20/vicdet1.htm 11 * and 12 * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html 13 * for info. A full-text web search on 6522 AND VIA will probably also 14 * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 15 * 16 * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b 17 * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) 18 * 19 */ 20 21 #include <linux/types.h> 22 #include <linux/kernel.h> 23 #include <linux/mm.h> 24 #include <linux/delay.h> 25 #include <linux/init.h> 26 #include <linux/ide.h> 27 28 #include <asm/traps.h> 29 #include <asm/bootinfo.h> 30 #include <asm/macintosh.h> 31 #include <asm/macints.h> 32 #include <asm/machw.h> 33 #include <asm/mac_via.h> 34 #include <asm/mac_psc.h> 35 36 volatile __u8 *via1, *via2; 37 #if 0 38 /* See note in mac_via.h about how this is possibly not useful */ 39 volatile long *via_memory_bogon=(long *)&via_memory_bogon; 40 #endif 41 int rbv_present,via_alt_mapping; 42 __u8 rbv_clear; 43 44 /* 45 * Globals for accessing the VIA chip registers without having to 46 * check if we're hitting a real VIA or an RBV. Normally you could 47 * just hit the combined register (ie, vIER|rIER) but that seems to 48 * break on AV Macs...probably because they actually decode more than 49 * eight address bits. Why can't Apple engineers at least be 50 * _consistently_ lazy? - 1999-05-21 (jmt) 51 */ 52 53 static int gIER,gIFR,gBufA,gBufB; 54 55 /* 56 * Timer defs. 57 */ 58 59 #define TICK_SIZE 10000 60 #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ 61 #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) 62 #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) 63 64 static int nubus_active; 65 66 void via_debug_dump(void); 67 irqreturn_t via1_irq(int, void *, struct pt_regs *); 68 irqreturn_t via2_irq(int, void *, struct pt_regs *); 69 irqreturn_t via_nubus_irq(int, void *, struct pt_regs *); 70 void via_irq_enable(int irq); 71 void via_irq_disable(int irq); 72 void via_irq_clear(int irq); 73 74 extern irqreturn_t mac_bang(int, void *, struct pt_regs *); 75 extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *); 76 extern int oss_present; 77 78 /* 79 * Initialize the VIAs 80 * 81 * First we figure out where they actually _are_ as well as what type of 82 * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) 83 * Then we pretty much clear them out and disable all IRQ sources. 84 * 85 * Note: the OSS is actually "detected" here and not in oss_init(). It just 86 * seems more logical to do it here since via_init() needs to know 87 * these things anyways. 88 */ 89 90 void __init via_init(void) 91 { 92 switch(macintosh_config->via_type) { 93 94 /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ 95 96 case MAC_VIA_IIci: 97 via1 = (void *) VIA1_BASE; 98 if (macintosh_config->ident == MAC_MODEL_IIFX) { 99 via2 = NULL; 100 rbv_present = 0; 101 oss_present = 1; 102 } else { 103 via2 = (void *) RBV_BASE; 104 rbv_present = 1; 105 oss_present = 0; 106 } 107 if (macintosh_config->ident == MAC_MODEL_LCIII) { 108 rbv_clear = 0x00; 109 } else { 110 /* on most RBVs (& unlike the VIAs), you */ 111 /* need to set bit 7 when you write to IFR */ 112 /* in order for your clear to occur. */ 113 rbv_clear = 0x80; 114 } 115 gIER = rIER; 116 gIFR = rIFR; 117 gBufA = rSIFR; 118 gBufB = rBufB; 119 break; 120 121 /* Quadra and early MacIIs agree on the VIA locations */ 122 123 case MAC_VIA_QUADRA: 124 case MAC_VIA_II: 125 via1 = (void *) VIA1_BASE; 126 via2 = (void *) VIA2_BASE; 127 rbv_present = 0; 128 oss_present = 0; 129 rbv_clear = 0x00; 130 gIER = vIER; 131 gIFR = vIFR; 132 gBufA = vBufA; 133 gBufB = vBufB; 134 break; 135 default: 136 panic("UNKNOWN VIA TYPE"); 137 } 138 139 printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); 140 141 printk(KERN_INFO "VIA2 at %p is ", via2); 142 if (rbv_present) { 143 printk(KERN_INFO "an RBV\n"); 144 } else if (oss_present) { 145 printk(KERN_INFO "an OSS\n"); 146 } else { 147 printk(KERN_INFO "a 6522 or clone\n"); 148 } 149 150 #ifdef DEBUG_VIA 151 via_debug_dump(); 152 #endif 153 154 /* 155 * Shut down all IRQ sources, reset the timers, and 156 * kill the timer latch on VIA1. 157 */ 158 159 via1[vIER] = 0x7F; 160 via1[vIFR] = 0x7F; 161 via1[vT1LL] = 0; 162 via1[vT1LH] = 0; 163 via1[vT1CL] = 0; 164 via1[vT1CH] = 0; 165 via1[vT2CL] = 0; 166 via1[vT2CH] = 0; 167 via1[vACR] &= 0x3F; 168 169 /* 170 * SE/30: disable video IRQ 171 * XXX: testing for SE/30 VBL 172 */ 173 174 if (macintosh_config->ident == MAC_MODEL_SE30) { 175 via1[vDirB] |= 0x40; 176 via1[vBufB] |= 0x40; 177 } 178 179 /* 180 * Set the RTC bits to a known state: all lines to outputs and 181 * RTC disabled (yes that's 0 to enable and 1 to disable). 182 */ 183 184 via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); 185 via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); 186 187 /* Everything below this point is VIA2/RBV only... */ 188 189 if (oss_present) return; 190 191 #if 1 192 /* Some machines support an alternate IRQ mapping that spreads */ 193 /* Ethernet and Sound out to their own autolevel IRQs and moves */ 194 /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ 195 /* that the IIfx emulates this alternate mapping using the OSS. */ 196 197 switch(macintosh_config->ident) { 198 case MAC_MODEL_C610: 199 case MAC_MODEL_Q610: 200 case MAC_MODEL_C650: 201 case MAC_MODEL_Q650: 202 case MAC_MODEL_Q700: 203 case MAC_MODEL_Q800: 204 case MAC_MODEL_Q900: 205 case MAC_MODEL_Q950: 206 via_alt_mapping = 1; 207 via1[vDirB] |= 0x40; 208 via1[vBufB] &= ~0x40; 209 break; 210 default: 211 via_alt_mapping = 0; 212 break; 213 } 214 #else 215 /* The alernate IRQ mapping seems to just not work. Anyone with a */ 216 /* supported machine is welcome to take a stab at fixing it. It */ 217 /* _should_ work on the following Quadras: 610,650,700,800,900,950 */ 218 /* - 1999-06-12 (jmt) */ 219 220 via_alt_mapping = 0; 221 #endif 222 223 /* 224 * Now initialize VIA2. For RBV we just kill all interrupts; 225 * for a regular VIA we also reset the timers and stuff. 226 */ 227 228 via2[gIER] = 0x7F; 229 via2[gIFR] = 0x7F | rbv_clear; 230 if (!rbv_present) { 231 via2[vT1LL] = 0; 232 via2[vT1LH] = 0; 233 via2[vT1CL] = 0; 234 via2[vT1CH] = 0; 235 via2[vT2CL] = 0; 236 via2[vT2CH] = 0; 237 via2[vACR] &= 0x3F; 238 } 239 } 240 241 /* 242 * Start the 100 Hz clock 243 */ 244 245 void __init via_init_clock(irqreturn_t (*func)(int, void *, struct pt_regs *)) 246 { 247 via1[vACR] |= 0x40; 248 via1[vT1LL] = MAC_CLOCK_LOW; 249 via1[vT1LH] = MAC_CLOCK_HIGH; 250 via1[vT1CL] = MAC_CLOCK_LOW; 251 via1[vT1CH] = MAC_CLOCK_HIGH; 252 253 request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); 254 } 255 256 /* 257 * Register the interrupt dispatchers for VIA or RBV machines only. 258 */ 259 260 void __init via_register_interrupts(void) 261 { 262 if (via_alt_mapping) { 263 cpu_request_irq(IRQ_AUTO_1, via1_irq, 264 IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", 265 (void *) via1); 266 cpu_request_irq(IRQ_AUTO_6, via1_irq, 267 IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", 268 (void *) via1); 269 } else { 270 cpu_request_irq(IRQ_AUTO_1, via1_irq, 271 IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", 272 (void *) via1); 273 #if 0 /* interferes with serial on some machines */ 274 if (!psc_present) { 275 cpu_request_irq(IRQ_AUTO_6, mac_bang, IRQ_FLG_LOCK, 276 "Off Switch", mac_bang); 277 } 278 #endif 279 } 280 cpu_request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, 281 "via2", (void *) via2); 282 if (!psc_present) { 283 cpu_request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, 284 "scc", mac_scc_dispatch); 285 } 286 request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, 287 "nubus", (void *) via2); 288 } 289 290 /* 291 * Debugging dump, used in various places to see what's going on. 292 */ 293 294 void via_debug_dump(void) 295 { 296 printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", 297 (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); 298 printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", 299 (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); 300 if (oss_present) { 301 printk(KERN_DEBUG "VIA2: <OSS>\n"); 302 } else if (rbv_present) { 303 printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", 304 (uint) via2[rIFR], (uint) via2[rIER]); 305 printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", 306 (uint) via2[rSIFR], (uint) via2[rSIER]); 307 } else { 308 printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", 309 (uint) via2[vDirA], (uint) via2[vDirB], 310 (uint) via2[vACR]); 311 printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", 312 (uint) via2[vPCR], 313 (uint) via2[vIFR], (uint) via2[vIER]); 314 } 315 } 316 317 /* 318 * This is always executed with interrupts disabled. 319 * 320 * TBI: get time offset between scheduling timer ticks 321 */ 322 323 unsigned long mac_gettimeoffset (void) 324 { 325 unsigned long ticks, offset = 0; 326 327 /* read VIA1 timer 2 current value */ 328 ticks = via1[vT1CL] | (via1[vT1CH] << 8); 329 /* The probability of underflow is less than 2% */ 330 if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) 331 /* Check for pending timer interrupt in VIA1 IFR */ 332 if (via1[vIFR] & 0x40) offset = TICK_SIZE; 333 334 ticks = MAC_CLOCK_TICK - ticks; 335 ticks = ticks * 10000L / MAC_CLOCK_TICK; 336 337 return ticks + offset; 338 } 339 340 /* 341 * Flush the L2 cache on Macs that have it by flipping 342 * the system into 24-bit mode for an instant. 343 */ 344 345 void via_flush_cache(void) 346 { 347 via2[gBufB] &= ~VIA2B_vMode32; 348 via2[gBufB] |= VIA2B_vMode32; 349 } 350 351 /* 352 * Return the status of the L2 cache on a IIci 353 */ 354 355 int via_get_cache_disable(void) 356 { 357 /* Safeguard against being called accidentally */ 358 if (!via2) { 359 printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); 360 return 1; 361 } 362 363 return (int) via2[gBufB] & VIA2B_vCDis; 364 } 365 366 /* 367 * Initialize VIA2 for Nubus access 368 */ 369 370 void __init via_nubus_init(void) 371 { 372 /* don't set nubus_active = 0 here, it kills the Baboon */ 373 /* interrupt that we've already registered. */ 374 375 /* unlock nubus transactions */ 376 377 if (!rbv_present) { 378 /* set the line to be an output on non-RBV machines */ 379 if ((macintosh_config->adb_type != MAC_ADB_PB1) && 380 (macintosh_config->adb_type != MAC_ADB_PB2)) { 381 via2[vDirB] |= 0x02; 382 } 383 } 384 385 /* this seems to be an ADB bit on PMU machines */ 386 /* according to MkLinux. -- jmt */ 387 388 if ((macintosh_config->adb_type != MAC_ADB_PB1) && 389 (macintosh_config->adb_type != MAC_ADB_PB2)) { 390 via2[gBufB] |= 0x02; 391 } 392 393 /* disable nubus slot interrupts. */ 394 if (rbv_present) { 395 via2[rSIER] = 0x7F; 396 via2[rSIER] = nubus_active | 0x80; 397 } else { 398 /* These are ADB bits on PMU */ 399 if ((macintosh_config->adb_type != MAC_ADB_PB1) && 400 (macintosh_config->adb_type != MAC_ADB_PB2)) { 401 switch(macintosh_config->ident) 402 { 403 case MAC_MODEL_II: 404 case MAC_MODEL_IIX: 405 case MAC_MODEL_IICX: 406 case MAC_MODEL_SE30: 407 via2[vBufA] |= 0x3F; 408 via2[vDirA] = ~nubus_active | 0xc0; 409 break; 410 default: 411 via2[vBufA] = 0xFF; 412 via2[vDirA] = ~nubus_active; 413 } 414 } 415 } 416 } 417 418 /* 419 * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's 420 * via6522.c :-), disable/pending masks added. 421 * 422 * The new interrupt architecture in macints.c takes care of a lot of the 423 * gruntwork for us, including tallying the interrupts and calling the 424 * handlers on the linked list. All we need to do here is basically generate 425 * the machspec interrupt number after clearing the interrupt. 426 */ 427 428 irqreturn_t via1_irq(int irq, void *dev_id, struct pt_regs *regs) 429 { 430 int irq_bit, i; 431 unsigned char events, mask; 432 433 mask = via1[vIER] & 0x7F; 434 if (!(events = via1[vIFR] & mask)) 435 return IRQ_NONE; 436 437 for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) 438 if (events & irq_bit) { 439 via1[vIER] = irq_bit; 440 mac_do_irq_list(VIA1_SOURCE_BASE + i, regs); 441 via1[vIFR] = irq_bit; 442 via1[vIER] = irq_bit | 0x80; 443 } 444 445 #if 0 /* freakin' pmu is doing weird stuff */ 446 if (!oss_present) { 447 /* This (still) seems to be necessary to get IDE 448 working. However, if you enable VBL interrupts, 449 you're screwed... */ 450 /* FIXME: should we check the SLOTIRQ bit before 451 pulling this stunt? */ 452 /* No, it won't be set. that's why we're doing this. */ 453 via_irq_disable(IRQ_MAC_NUBUS); 454 via_irq_clear(IRQ_MAC_NUBUS); 455 mac_do_irq_list(IRQ_MAC_NUBUS, regs); 456 via_irq_enable(IRQ_MAC_NUBUS); 457 } 458 #endif 459 return IRQ_HANDLED; 460 } 461 462 irqreturn_t via2_irq(int irq, void *dev_id, struct pt_regs *regs) 463 { 464 int irq_bit, i; 465 unsigned char events, mask; 466 467 mask = via2[gIER] & 0x7F; 468 if (!(events = via2[gIFR] & mask)) 469 return IRQ_NONE; 470 471 for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) 472 if (events & irq_bit) { 473 via2[gIER] = irq_bit; 474 mac_do_irq_list(VIA2_SOURCE_BASE + i, regs); 475 via2[gIFR] = irq_bit | rbv_clear; 476 via2[gIER] = irq_bit | 0x80; 477 } 478 return IRQ_HANDLED; 479 } 480 481 /* 482 * Dispatch Nubus interrupts. We are called as a secondary dispatch by the 483 * VIA2 dispatcher as a fast interrupt handler. 484 */ 485 486 irqreturn_t via_nubus_irq(int irq, void *dev_id, struct pt_regs *regs) 487 { 488 int irq_bit, i; 489 unsigned char events; 490 491 if (!(events = ~via2[gBufA] & nubus_active)) 492 return IRQ_NONE; 493 494 for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) { 495 if (events & irq_bit) { 496 via_irq_disable(NUBUS_SOURCE_BASE + i); 497 mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs); 498 via_irq_enable(NUBUS_SOURCE_BASE + i); 499 } 500 } 501 return IRQ_HANDLED; 502 } 503 504 void via_irq_enable(int irq) { 505 int irq_src = IRQ_SRC(irq); 506 int irq_idx = IRQ_IDX(irq); 507 int irq_bit = 1 << irq_idx; 508 509 #ifdef DEBUG_IRQUSE 510 printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); 511 #endif 512 513 if (irq_src == 1) { 514 via1[vIER] = irq_bit | 0x80; 515 } else if (irq_src == 2) { 516 /* 517 * Set vPCR for SCSI interrupts (but not on RBV) 518 */ 519 if ((irq_idx == 0) && !rbv_present) { 520 if (macintosh_config->scsi_type == MAC_SCSI_OLD) { 521 /* CB2 (IRQ) indep. input, positive edge */ 522 /* CA2 (DRQ) indep. input, positive edge */ 523 via2[vPCR] = 0x66; 524 } else { 525 /* CB2 (IRQ) indep. input, negative edge */ 526 /* CA2 (DRQ) indep. input, negative edge */ 527 via2[vPCR] = 0x22; 528 } 529 } 530 via2[gIER] = irq_bit | 0x80; 531 } else if (irq_src == 7) { 532 if (rbv_present) { 533 /* enable the slot interrupt. SIER works like IER. */ 534 via2[rSIER] = IER_SET_BIT(irq_idx); 535 } else { 536 /* Make sure the bit is an input, to enable the irq */ 537 /* But not on PowerBooks, that's ADB... */ 538 if ((macintosh_config->adb_type != MAC_ADB_PB1) && 539 (macintosh_config->adb_type != MAC_ADB_PB2)) { 540 switch(macintosh_config->ident) 541 { 542 case MAC_MODEL_II: 543 case MAC_MODEL_IIX: 544 case MAC_MODEL_IICX: 545 case MAC_MODEL_SE30: 546 via2[vDirA] &= (~irq_bit | 0xc0); 547 break; 548 default: 549 via2[vDirA] &= ~irq_bit; 550 } 551 } 552 } 553 nubus_active |= irq_bit; 554 } 555 } 556 557 void via_irq_disable(int irq) { 558 int irq_src = IRQ_SRC(irq); 559 int irq_idx = IRQ_IDX(irq); 560 int irq_bit = 1 << irq_idx; 561 562 #ifdef DEBUG_IRQUSE 563 printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); 564 #endif 565 566 if (irq_src == 1) { 567 via1[vIER] = irq_bit; 568 } else if (irq_src == 2) { 569 via2[gIER] = irq_bit; 570 } else if (irq_src == 7) { 571 if (rbv_present) { 572 /* disable the slot interrupt. SIER works like IER. */ 573 via2[rSIER] = IER_CLR_BIT(irq_idx); 574 } else { 575 /* disable the nubus irq by changing dir to output */ 576 /* except on PMU */ 577 if ((macintosh_config->adb_type != MAC_ADB_PB1) && 578 (macintosh_config->adb_type != MAC_ADB_PB2)) { 579 via2[vDirA] |= irq_bit; 580 } 581 } 582 nubus_active &= ~irq_bit; 583 } 584 } 585 586 void via_irq_clear(int irq) { 587 int irq_src = IRQ_SRC(irq); 588 int irq_idx = IRQ_IDX(irq); 589 int irq_bit = 1 << irq_idx; 590 591 if (irq_src == 1) { 592 via1[vIFR] = irq_bit; 593 } else if (irq_src == 2) { 594 via2[gIFR] = irq_bit | rbv_clear; 595 } else if (irq_src == 7) { 596 /* FIXME: hmm.. */ 597 } 598 } 599 600 /* 601 * Returns nonzero if an interrupt is pending on the given 602 * VIA/IRQ combination. 603 */ 604 605 int via_irq_pending(int irq) 606 { 607 int irq_src = IRQ_SRC(irq); 608 int irq_idx = IRQ_IDX(irq); 609 int irq_bit = 1 << irq_idx; 610 611 if (irq_src == 1) { 612 return via1[vIFR] & irq_bit; 613 } else if (irq_src == 2) { 614 return via2[gIFR] & irq_bit; 615 } else if (irq_src == 7) { 616 return ~via2[gBufA] & irq_bit; 617 } 618 return 0; 619 } 620