Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/bootinfo.h> |
| 29 | #include <asm/macintosh.h> |
| 30 | #include <asm/macints.h> |
| 31 | #include <asm/machw.h> |
| 32 | #include <asm/mac_via.h> |
| 33 | #include <asm/mac_psc.h> |
| 34 | |
| 35 | volatile __u8 *via1, *via2; |
| 36 | #if 0 |
| 37 | /* See note in mac_via.h about how this is possibly not useful */ |
| 38 | volatile long *via_memory_bogon=(long *)&via_memory_bogon; |
| 39 | #endif |
| 40 | int rbv_present,via_alt_mapping; |
| 41 | __u8 rbv_clear; |
| 42 | |
| 43 | /* |
| 44 | * Globals for accessing the VIA chip registers without having to |
| 45 | * check if we're hitting a real VIA or an RBV. Normally you could |
| 46 | * just hit the combined register (ie, vIER|rIER) but that seems to |
| 47 | * break on AV Macs...probably because they actually decode more than |
| 48 | * eight address bits. Why can't Apple engineers at least be |
| 49 | * _consistently_ lazy? - 1999-05-21 (jmt) |
| 50 | */ |
| 51 | |
| 52 | static int gIER,gIFR,gBufA,gBufB; |
| 53 | |
| 54 | /* |
| 55 | * Timer defs. |
| 56 | */ |
| 57 | |
| 58 | #define TICK_SIZE 10000 |
| 59 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ |
| 60 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) |
| 61 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) |
| 62 | |
| 63 | static int nubus_active; |
| 64 | |
| 65 | void via_debug_dump(void); |
| 66 | irqreturn_t via1_irq(int, void *, struct pt_regs *); |
| 67 | irqreturn_t via2_irq(int, void *, struct pt_regs *); |
| 68 | irqreturn_t via_nubus_irq(int, void *, struct pt_regs *); |
| 69 | void via_irq_enable(int irq); |
| 70 | void via_irq_disable(int irq); |
| 71 | void via_irq_clear(int irq); |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *); |
| 74 | extern int oss_present; |
| 75 | |
| 76 | /* |
| 77 | * Initialize the VIAs |
| 78 | * |
| 79 | * First we figure out where they actually _are_ as well as what type of |
| 80 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) |
| 81 | * Then we pretty much clear them out and disable all IRQ sources. |
| 82 | * |
| 83 | * Note: the OSS is actually "detected" here and not in oss_init(). It just |
| 84 | * seems more logical to do it here since via_init() needs to know |
| 85 | * these things anyways. |
| 86 | */ |
| 87 | |
| 88 | void __init via_init(void) |
| 89 | { |
| 90 | switch(macintosh_config->via_type) { |
| 91 | |
| 92 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ |
| 93 | |
| 94 | case MAC_VIA_IIci: |
| 95 | via1 = (void *) VIA1_BASE; |
| 96 | if (macintosh_config->ident == MAC_MODEL_IIFX) { |
| 97 | via2 = NULL; |
| 98 | rbv_present = 0; |
| 99 | oss_present = 1; |
| 100 | } else { |
| 101 | via2 = (void *) RBV_BASE; |
| 102 | rbv_present = 1; |
| 103 | oss_present = 0; |
| 104 | } |
| 105 | if (macintosh_config->ident == MAC_MODEL_LCIII) { |
| 106 | rbv_clear = 0x00; |
| 107 | } else { |
| 108 | /* on most RBVs (& unlike the VIAs), you */ |
| 109 | /* need to set bit 7 when you write to IFR */ |
| 110 | /* in order for your clear to occur. */ |
| 111 | rbv_clear = 0x80; |
| 112 | } |
| 113 | gIER = rIER; |
| 114 | gIFR = rIFR; |
| 115 | gBufA = rSIFR; |
| 116 | gBufB = rBufB; |
| 117 | break; |
| 118 | |
| 119 | /* Quadra and early MacIIs agree on the VIA locations */ |
| 120 | |
| 121 | case MAC_VIA_QUADRA: |
| 122 | case MAC_VIA_II: |
| 123 | via1 = (void *) VIA1_BASE; |
| 124 | via2 = (void *) VIA2_BASE; |
| 125 | rbv_present = 0; |
| 126 | oss_present = 0; |
| 127 | rbv_clear = 0x00; |
| 128 | gIER = vIER; |
| 129 | gIFR = vIFR; |
| 130 | gBufA = vBufA; |
| 131 | gBufB = vBufB; |
| 132 | break; |
| 133 | default: |
| 134 | panic("UNKNOWN VIA TYPE"); |
| 135 | } |
| 136 | |
| 137 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); |
| 138 | |
| 139 | printk(KERN_INFO "VIA2 at %p is ", via2); |
| 140 | if (rbv_present) { |
| 141 | printk(KERN_INFO "an RBV\n"); |
| 142 | } else if (oss_present) { |
| 143 | printk(KERN_INFO "an OSS\n"); |
| 144 | } else { |
| 145 | printk(KERN_INFO "a 6522 or clone\n"); |
| 146 | } |
| 147 | |
| 148 | #ifdef DEBUG_VIA |
| 149 | via_debug_dump(); |
| 150 | #endif |
| 151 | |
| 152 | /* |
| 153 | * Shut down all IRQ sources, reset the timers, and |
| 154 | * kill the timer latch on VIA1. |
| 155 | */ |
| 156 | |
| 157 | via1[vIER] = 0x7F; |
| 158 | via1[vIFR] = 0x7F; |
| 159 | via1[vT1LL] = 0; |
| 160 | via1[vT1LH] = 0; |
| 161 | via1[vT1CL] = 0; |
| 162 | via1[vT1CH] = 0; |
| 163 | via1[vT2CL] = 0; |
| 164 | via1[vT2CH] = 0; |
| 165 | via1[vACR] &= 0x3F; |
| 166 | |
| 167 | /* |
| 168 | * SE/30: disable video IRQ |
| 169 | * XXX: testing for SE/30 VBL |
| 170 | */ |
| 171 | |
| 172 | if (macintosh_config->ident == MAC_MODEL_SE30) { |
| 173 | via1[vDirB] |= 0x40; |
| 174 | via1[vBufB] |= 0x40; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Set the RTC bits to a known state: all lines to outputs and |
| 179 | * RTC disabled (yes that's 0 to enable and 1 to disable). |
| 180 | */ |
| 181 | |
| 182 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); |
| 183 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); |
| 184 | |
| 185 | /* Everything below this point is VIA2/RBV only... */ |
| 186 | |
| 187 | if (oss_present) return; |
| 188 | |
| 189 | #if 1 |
| 190 | /* Some machines support an alternate IRQ mapping that spreads */ |
| 191 | /* Ethernet and Sound out to their own autolevel IRQs and moves */ |
| 192 | /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ |
| 193 | /* that the IIfx emulates this alternate mapping using the OSS. */ |
| 194 | |
| 195 | switch(macintosh_config->ident) { |
| 196 | case MAC_MODEL_C610: |
| 197 | case MAC_MODEL_Q610: |
| 198 | case MAC_MODEL_C650: |
| 199 | case MAC_MODEL_Q650: |
| 200 | case MAC_MODEL_Q700: |
| 201 | case MAC_MODEL_Q800: |
| 202 | case MAC_MODEL_Q900: |
| 203 | case MAC_MODEL_Q950: |
| 204 | via_alt_mapping = 1; |
| 205 | via1[vDirB] |= 0x40; |
| 206 | via1[vBufB] &= ~0x40; |
| 207 | break; |
| 208 | default: |
| 209 | via_alt_mapping = 0; |
| 210 | break; |
| 211 | } |
| 212 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | via_alt_mapping = 0; |
| 214 | #endif |
| 215 | |
| 216 | /* |
| 217 | * Now initialize VIA2. For RBV we just kill all interrupts; |
| 218 | * for a regular VIA we also reset the timers and stuff. |
| 219 | */ |
| 220 | |
| 221 | via2[gIER] = 0x7F; |
| 222 | via2[gIFR] = 0x7F | rbv_clear; |
| 223 | if (!rbv_present) { |
| 224 | via2[vT1LL] = 0; |
| 225 | via2[vT1LH] = 0; |
| 226 | via2[vT1CL] = 0; |
| 227 | via2[vT1CH] = 0; |
| 228 | via2[vT2CL] = 0; |
| 229 | via2[vT2CH] = 0; |
| 230 | via2[vACR] &= 0x3F; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Start the 100 Hz clock |
| 236 | */ |
| 237 | |
| 238 | void __init via_init_clock(irqreturn_t (*func)(int, void *, struct pt_regs *)) |
| 239 | { |
| 240 | via1[vACR] |= 0x40; |
| 241 | via1[vT1LL] = MAC_CLOCK_LOW; |
| 242 | via1[vT1LH] = MAC_CLOCK_HIGH; |
| 243 | via1[vT1CL] = MAC_CLOCK_LOW; |
| 244 | via1[vT1CH] = MAC_CLOCK_HIGH; |
| 245 | |
| 246 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * Register the interrupt dispatchers for VIA or RBV machines only. |
| 251 | */ |
| 252 | |
| 253 | void __init via_register_interrupts(void) |
| 254 | { |
| 255 | if (via_alt_mapping) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 256 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", |
| 258 | (void *) via1); |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 259 | request_irq(IRQ_AUTO_6, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 261 | (void *) via1); |
| 262 | } else { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 263 | request_irq(IRQ_AUTO_1, via1_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
| 265 | (void *) via1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 267 | request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | "via2", (void *) via2); |
| 269 | if (!psc_present) { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 270 | request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | "scc", mac_scc_dispatch); |
| 272 | } |
| 273 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
| 274 | "nubus", (void *) via2); |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Debugging dump, used in various places to see what's going on. |
| 279 | */ |
| 280 | |
| 281 | void via_debug_dump(void) |
| 282 | { |
| 283 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 284 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); |
| 285 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 286 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); |
| 287 | if (oss_present) { |
| 288 | printk(KERN_DEBUG "VIA2: <OSS>\n"); |
| 289 | } else if (rbv_present) { |
| 290 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", |
| 291 | (uint) via2[rIFR], (uint) via2[rIER]); |
| 292 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", |
| 293 | (uint) via2[rSIFR], (uint) via2[rSIER]); |
| 294 | } else { |
| 295 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", |
| 296 | (uint) via2[vDirA], (uint) via2[vDirB], |
| 297 | (uint) via2[vACR]); |
| 298 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", |
| 299 | (uint) via2[vPCR], |
| 300 | (uint) via2[vIFR], (uint) via2[vIER]); |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * This is always executed with interrupts disabled. |
| 306 | * |
| 307 | * TBI: get time offset between scheduling timer ticks |
| 308 | */ |
| 309 | |
| 310 | unsigned long mac_gettimeoffset (void) |
| 311 | { |
| 312 | unsigned long ticks, offset = 0; |
| 313 | |
| 314 | /* read VIA1 timer 2 current value */ |
| 315 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); |
| 316 | /* The probability of underflow is less than 2% */ |
| 317 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) |
| 318 | /* Check for pending timer interrupt in VIA1 IFR */ |
| 319 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; |
| 320 | |
| 321 | ticks = MAC_CLOCK_TICK - ticks; |
| 322 | ticks = ticks * 10000L / MAC_CLOCK_TICK; |
| 323 | |
| 324 | return ticks + offset; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Flush the L2 cache on Macs that have it by flipping |
| 329 | * the system into 24-bit mode for an instant. |
| 330 | */ |
| 331 | |
| 332 | void via_flush_cache(void) |
| 333 | { |
| 334 | via2[gBufB] &= ~VIA2B_vMode32; |
| 335 | via2[gBufB] |= VIA2B_vMode32; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Return the status of the L2 cache on a IIci |
| 340 | */ |
| 341 | |
| 342 | int via_get_cache_disable(void) |
| 343 | { |
| 344 | /* Safeguard against being called accidentally */ |
| 345 | if (!via2) { |
| 346 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); |
| 347 | return 1; |
| 348 | } |
| 349 | |
| 350 | return (int) via2[gBufB] & VIA2B_vCDis; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Initialize VIA2 for Nubus access |
| 355 | */ |
| 356 | |
| 357 | void __init via_nubus_init(void) |
| 358 | { |
| 359 | /* don't set nubus_active = 0 here, it kills the Baboon */ |
| 360 | /* interrupt that we've already registered. */ |
| 361 | |
| 362 | /* unlock nubus transactions */ |
| 363 | |
| 364 | if (!rbv_present) { |
| 365 | /* set the line to be an output on non-RBV machines */ |
| 366 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 367 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 368 | via2[vDirB] |= 0x02; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* this seems to be an ADB bit on PMU machines */ |
| 373 | /* according to MkLinux. -- jmt */ |
| 374 | |
| 375 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 376 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 377 | via2[gBufB] |= 0x02; |
| 378 | } |
| 379 | |
| 380 | /* disable nubus slot interrupts. */ |
| 381 | if (rbv_present) { |
| 382 | via2[rSIER] = 0x7F; |
| 383 | via2[rSIER] = nubus_active | 0x80; |
| 384 | } else { |
| 385 | /* These are ADB bits on PMU */ |
| 386 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 387 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 388 | switch(macintosh_config->ident) |
| 389 | { |
| 390 | case MAC_MODEL_II: |
| 391 | case MAC_MODEL_IIX: |
| 392 | case MAC_MODEL_IICX: |
| 393 | case MAC_MODEL_SE30: |
| 394 | via2[vBufA] |= 0x3F; |
| 395 | via2[vDirA] = ~nubus_active | 0xc0; |
| 396 | break; |
| 397 | default: |
| 398 | via2[vBufA] = 0xFF; |
| 399 | via2[vDirA] = ~nubus_active; |
| 400 | } |
| 401 | } |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's |
| 407 | * via6522.c :-), disable/pending masks added. |
| 408 | * |
| 409 | * The new interrupt architecture in macints.c takes care of a lot of the |
| 410 | * gruntwork for us, including tallying the interrupts and calling the |
| 411 | * handlers on the linked list. All we need to do here is basically generate |
| 412 | * the machspec interrupt number after clearing the interrupt. |
| 413 | */ |
| 414 | |
| 415 | irqreturn_t via1_irq(int irq, void *dev_id, struct pt_regs *regs) |
| 416 | { |
| 417 | int irq_bit, i; |
| 418 | unsigned char events, mask; |
| 419 | |
| 420 | mask = via1[vIER] & 0x7F; |
| 421 | if (!(events = via1[vIFR] & mask)) |
| 422 | return IRQ_NONE; |
| 423 | |
| 424 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) |
| 425 | if (events & irq_bit) { |
| 426 | via1[vIER] = irq_bit; |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 427 | m68k_handle_int(VIA1_SOURCE_BASE + i, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | via1[vIFR] = irq_bit; |
| 429 | via1[vIER] = irq_bit | 0x80; |
| 430 | } |
| 431 | |
| 432 | #if 0 /* freakin' pmu is doing weird stuff */ |
| 433 | if (!oss_present) { |
| 434 | /* This (still) seems to be necessary to get IDE |
| 435 | working. However, if you enable VBL interrupts, |
| 436 | you're screwed... */ |
| 437 | /* FIXME: should we check the SLOTIRQ bit before |
| 438 | pulling this stunt? */ |
| 439 | /* No, it won't be set. that's why we're doing this. */ |
| 440 | via_irq_disable(IRQ_MAC_NUBUS); |
| 441 | via_irq_clear(IRQ_MAC_NUBUS); |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 442 | m68k_handle_int(IRQ_MAC_NUBUS, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | via_irq_enable(IRQ_MAC_NUBUS); |
| 444 | } |
| 445 | #endif |
| 446 | return IRQ_HANDLED; |
| 447 | } |
| 448 | |
| 449 | irqreturn_t via2_irq(int irq, void *dev_id, struct pt_regs *regs) |
| 450 | { |
| 451 | int irq_bit, i; |
| 452 | unsigned char events, mask; |
| 453 | |
| 454 | mask = via2[gIER] & 0x7F; |
| 455 | if (!(events = via2[gIFR] & mask)) |
| 456 | return IRQ_NONE; |
| 457 | |
| 458 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) |
| 459 | if (events & irq_bit) { |
| 460 | via2[gIER] = irq_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | via2[gIFR] = irq_bit | rbv_clear; |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 462 | m68k_handle_int(VIA2_SOURCE_BASE + i, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | via2[gIER] = irq_bit | 0x80; |
| 464 | } |
| 465 | return IRQ_HANDLED; |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the |
| 470 | * VIA2 dispatcher as a fast interrupt handler. |
| 471 | */ |
| 472 | |
| 473 | irqreturn_t via_nubus_irq(int irq, void *dev_id, struct pt_regs *regs) |
| 474 | { |
| 475 | int irq_bit, i; |
| 476 | unsigned char events; |
| 477 | |
| 478 | if (!(events = ~via2[gBufA] & nubus_active)) |
| 479 | return IRQ_NONE; |
| 480 | |
| 481 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) { |
| 482 | if (events & irq_bit) { |
| 483 | via_irq_disable(NUBUS_SOURCE_BASE + i); |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 484 | m68k_handle_int(NUBUS_SOURCE_BASE + i, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | via_irq_enable(NUBUS_SOURCE_BASE + i); |
| 486 | } |
| 487 | } |
| 488 | return IRQ_HANDLED; |
| 489 | } |
| 490 | |
| 491 | void via_irq_enable(int irq) { |
| 492 | int irq_src = IRQ_SRC(irq); |
| 493 | int irq_idx = IRQ_IDX(irq); |
| 494 | int irq_bit = 1 << irq_idx; |
| 495 | |
| 496 | #ifdef DEBUG_IRQUSE |
| 497 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); |
| 498 | #endif |
| 499 | |
| 500 | if (irq_src == 1) { |
| 501 | via1[vIER] = irq_bit | 0x80; |
| 502 | } else if (irq_src == 2) { |
| 503 | /* |
| 504 | * Set vPCR for SCSI interrupts (but not on RBV) |
| 505 | */ |
| 506 | if ((irq_idx == 0) && !rbv_present) { |
| 507 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { |
| 508 | /* CB2 (IRQ) indep. input, positive edge */ |
| 509 | /* CA2 (DRQ) indep. input, positive edge */ |
| 510 | via2[vPCR] = 0x66; |
| 511 | } else { |
| 512 | /* CB2 (IRQ) indep. input, negative edge */ |
| 513 | /* CA2 (DRQ) indep. input, negative edge */ |
| 514 | via2[vPCR] = 0x22; |
| 515 | } |
| 516 | } |
| 517 | via2[gIER] = irq_bit | 0x80; |
| 518 | } else if (irq_src == 7) { |
Finn Thain | 1a23989 | 2006-06-23 02:04:59 -0700 | [diff] [blame] | 519 | nubus_active |= irq_bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (rbv_present) { |
| 521 | /* enable the slot interrupt. SIER works like IER. */ |
| 522 | via2[rSIER] = IER_SET_BIT(irq_idx); |
| 523 | } else { |
| 524 | /* Make sure the bit is an input, to enable the irq */ |
| 525 | /* But not on PowerBooks, that's ADB... */ |
| 526 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 527 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 528 | switch(macintosh_config->ident) |
| 529 | { |
| 530 | case MAC_MODEL_II: |
| 531 | case MAC_MODEL_IIX: |
| 532 | case MAC_MODEL_IICX: |
| 533 | case MAC_MODEL_SE30: |
| 534 | via2[vDirA] &= (~irq_bit | 0xc0); |
| 535 | break; |
| 536 | default: |
| 537 | via2[vDirA] &= ~irq_bit; |
| 538 | } |
| 539 | } |
| 540 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | } |
| 543 | |
| 544 | void via_irq_disable(int irq) { |
| 545 | int irq_src = IRQ_SRC(irq); |
| 546 | int irq_idx = IRQ_IDX(irq); |
| 547 | int irq_bit = 1 << irq_idx; |
| 548 | |
| 549 | #ifdef DEBUG_IRQUSE |
| 550 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); |
| 551 | #endif |
| 552 | |
| 553 | if (irq_src == 1) { |
| 554 | via1[vIER] = irq_bit; |
| 555 | } else if (irq_src == 2) { |
| 556 | via2[gIER] = irq_bit; |
| 557 | } else if (irq_src == 7) { |
| 558 | if (rbv_present) { |
| 559 | /* disable the slot interrupt. SIER works like IER. */ |
| 560 | via2[rSIER] = IER_CLR_BIT(irq_idx); |
| 561 | } else { |
| 562 | /* disable the nubus irq by changing dir to output */ |
| 563 | /* except on PMU */ |
| 564 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && |
| 565 | (macintosh_config->adb_type != MAC_ADB_PB2)) { |
| 566 | via2[vDirA] |= irq_bit; |
| 567 | } |
| 568 | } |
| 569 | nubus_active &= ~irq_bit; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | void via_irq_clear(int irq) { |
| 574 | int irq_src = IRQ_SRC(irq); |
| 575 | int irq_idx = IRQ_IDX(irq); |
| 576 | int irq_bit = 1 << irq_idx; |
| 577 | |
| 578 | if (irq_src == 1) { |
| 579 | via1[vIFR] = irq_bit; |
| 580 | } else if (irq_src == 2) { |
| 581 | via2[gIFR] = irq_bit | rbv_clear; |
| 582 | } else if (irq_src == 7) { |
| 583 | /* FIXME: hmm.. */ |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Returns nonzero if an interrupt is pending on the given |
| 589 | * VIA/IRQ combination. |
| 590 | */ |
| 591 | |
| 592 | int via_irq_pending(int irq) |
| 593 | { |
| 594 | int irq_src = IRQ_SRC(irq); |
| 595 | int irq_idx = IRQ_IDX(irq); |
| 596 | int irq_bit = 1 << irq_idx; |
| 597 | |
| 598 | if (irq_src == 1) { |
| 599 | return via1[vIFR] & irq_bit; |
| 600 | } else if (irq_src == 2) { |
| 601 | return via2[gIFR] & irq_bit; |
| 602 | } else if (irq_src == 7) { |
| 603 | return ~via2[gBufA] & irq_bit; |
| 604 | } |
| 605 | return 0; |
| 606 | } |