1 /* 2 * Macintosh interrupts 3 * 4 * General design: 5 * In contrary to the Amiga and Atari platforms, the Mac hardware seems to 6 * exclusively use the autovector interrupts (the 'generic level0-level7' 7 * interrupts with exception vectors 0x19-0x1f). The following interrupt levels 8 * are used: 9 * 1 - VIA1 10 * - slot 0: one second interrupt (CA2) 11 * - slot 1: VBlank (CA1) 12 * - slot 2: ADB data ready (SR full) 13 * - slot 3: ADB data (CB2) 14 * - slot 4: ADB clock (CB1) 15 * - slot 5: timer 2 16 * - slot 6: timer 1 17 * - slot 7: status of IRQ; signals 'any enabled int.' 18 * 19 * 2 - VIA2 or RBV 20 * - slot 0: SCSI DRQ (CA2) 21 * - slot 1: NUBUS IRQ (CA1) need to read port A to find which 22 * - slot 2: /EXP IRQ (only on IIci) 23 * - slot 3: SCSI IRQ (CB2) 24 * - slot 4: ASC IRQ (CB1) 25 * - slot 5: timer 2 (not on IIci) 26 * - slot 6: timer 1 (not on IIci) 27 * - slot 7: status of IRQ; signals 'any enabled int.' 28 * 29 * 2 - OSS (IIfx only?) 30 * - slot 0: SCSI interrupt 31 * - slot 1: Sound interrupt 32 * 33 * Levels 3-6 vary by machine type. For VIA or RBV Macintoshes: 34 * 35 * 3 - unused (?) 36 * 37 * 4 - SCC 38 * 39 * 5 - unused (?) 40 * [serial errors or special conditions seem to raise level 6 41 * interrupts on some models (LC4xx?)] 42 * 43 * 6 - off switch (?) 44 * 45 * For OSS Macintoshes (IIfx only at this point): 46 * 47 * 3 - Nubus interrupt 48 * - slot 0: Slot $9 49 * - slot 1: Slot $A 50 * - slot 2: Slot $B 51 * - slot 3: Slot $C 52 * - slot 4: Slot $D 53 * - slot 5: Slot $E 54 * 55 * 4 - SCC IOP 56 * 57 * 5 - ISM IOP (ADB?) 58 * 59 * 6 - unused 60 * 61 * For PSC Macintoshes (660AV, 840AV): 62 * 63 * 3 - PSC level 3 64 * - slot 0: MACE 65 * 66 * 4 - PSC level 4 67 * - slot 1: SCC channel A interrupt 68 * - slot 2: SCC channel B interrupt 69 * - slot 3: MACE DMA 70 * 71 * 5 - PSC level 5 72 * 73 * 6 - PSC level 6 74 * 75 * Finally we have good 'ole level 7, the non-maskable interrupt: 76 * 77 * 7 - NMI (programmer's switch on the back of some Macs) 78 * Also RAM parity error on models which support it (IIc, IIfx?) 79 * 80 * The current interrupt logic looks something like this: 81 * 82 * - We install dispatchers for the autovector interrupts (1-7). These 83 * dispatchers are responsible for querying the hardware (the 84 * VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using 85 * this information a machspec interrupt number is generated by placing the 86 * index of the interrupt hardware into the low three bits and the original 87 * autovector interrupt number in the upper 5 bits. The handlers for the 88 * resulting machspec interrupt are then called. 89 * 90 * - Nubus is a special case because its interrupts are hidden behind two 91 * layers of hardware. Nubus interrupts come in as index 1 on VIA #2, 92 * which translates to IRQ number 17. In this spot we install _another_ 93 * dispatcher. This dispatcher finds the interrupting slot number (9-F) and 94 * then forms a new machspec interrupt number as above with the slot number 95 * minus 9 in the low three bits and the pseudo-level 7 in the upper five 96 * bits. The handlers for this new machspec interrupt number are then 97 * called. This puts Nubus interrupts into the range 56-62. 98 * 99 * - The Baboon interrupts (used on some PowerBooks) are an even more special 100 * case. They're hidden behind the Nubus slot $C interrupt thus adding a 101 * third layer of indirection. Why oh why did the Apple engineers do that? 102 * 103 * - We support "fast" and "slow" handlers, just like the Amiga port. The 104 * fast handlers are called first and with all interrupts disabled. They 105 * are expected to execute quickly (hence the name). The slow handlers are 106 * called last with interrupts enabled and the interrupt level restored. 107 * They must therefore be reentrant. 108 * 109 * TODO: 110 * 111 */ 112 113 #include <linux/module.h> 114 #include <linux/types.h> 115 #include <linux/kernel.h> 116 #include <linux/sched.h> 117 #include <linux/kernel_stat.h> 118 #include <linux/interrupt.h> /* for intr_count */ 119 #include <linux/delay.h> 120 #include <linux/seq_file.h> 121 122 #include <asm/system.h> 123 #include <asm/irq.h> 124 #include <asm/traps.h> 125 #include <asm/bootinfo.h> 126 #include <asm/macintosh.h> 127 #include <asm/mac_via.h> 128 #include <asm/mac_psc.h> 129 #include <asm/hwtest.h> 130 #include <asm/errno.h> 131 #include <asm/macints.h> 132 #include <asm/irq_regs.h> 133 #include <asm/mac_oss.h> 134 135 #define SHUTUP_SONIC 136 137 /* 138 * VIA/RBV hooks 139 */ 140 141 extern void via_register_interrupts(void); 142 extern void via_irq_enable(int); 143 extern void via_irq_disable(int); 144 extern void via_irq_clear(int); 145 extern int via_irq_pending(int); 146 147 /* 148 * OSS hooks 149 */ 150 151 extern void oss_register_interrupts(void); 152 extern void oss_irq_enable(int); 153 extern void oss_irq_disable(int); 154 extern void oss_irq_clear(int); 155 extern int oss_irq_pending(int); 156 157 /* 158 * PSC hooks 159 */ 160 161 extern void psc_register_interrupts(void); 162 extern void psc_irq_enable(int); 163 extern void psc_irq_disable(int); 164 extern void psc_irq_clear(int); 165 extern int psc_irq_pending(int); 166 167 /* 168 * IOP hooks 169 */ 170 171 extern void iop_register_interrupts(void); 172 173 /* 174 * Baboon hooks 175 */ 176 177 extern int baboon_present; 178 179 extern void baboon_register_interrupts(void); 180 extern void baboon_irq_enable(int); 181 extern void baboon_irq_disable(int); 182 extern void baboon_irq_clear(int); 183 184 /* 185 * console_loglevel determines NMI handler function 186 */ 187 188 irqreturn_t mac_nmi_handler(int, void *); 189 irqreturn_t mac_debug_handler(int, void *); 190 191 /* #define DEBUG_MACINTS */ 192 193 void mac_enable_irq(unsigned int irq); 194 void mac_disable_irq(unsigned int irq); 195 196 static struct irq_chip mac_irq_chip = { 197 .name = "mac", 198 .irq_enable = mac_enable_irq, 199 .irq_disable = mac_disable_irq, 200 }; 201 202 void __init mac_init_IRQ(void) 203 { 204 #ifdef DEBUG_MACINTS 205 printk("mac_init_IRQ(): Setting things up...\n"); 206 #endif 207 m68k_setup_irq_chip(&mac_irq_chip, IRQ_USER, 208 NUM_MAC_SOURCES - IRQ_USER); 209 /* Make sure the SONIC interrupt is cleared or things get ugly */ 210 #ifdef SHUTUP_SONIC 211 printk("Killing onboard sonic... "); 212 /* This address should hopefully be mapped already */ 213 if (hwreg_present((void*)(0x50f0a000))) { 214 *(long *)(0x50f0a014) = 0x7fffL; 215 *(long *)(0x50f0a010) = 0L; 216 } 217 printk("Done.\n"); 218 #endif /* SHUTUP_SONIC */ 219 220 /* 221 * Now register the handlers for the master IRQ handlers 222 * at levels 1-7. Most of the work is done elsewhere. 223 */ 224 225 if (oss_present) 226 oss_register_interrupts(); 227 else 228 via_register_interrupts(); 229 if (psc_present) 230 psc_register_interrupts(); 231 if (baboon_present) 232 baboon_register_interrupts(); 233 iop_register_interrupts(); 234 if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI", 235 mac_nmi_handler)) 236 pr_err("Couldn't register NMI\n"); 237 #ifdef DEBUG_MACINTS 238 printk("mac_init_IRQ(): Done!\n"); 239 #endif 240 } 241 242 /* 243 * mac_enable_irq - enable an interrupt source 244 * mac_disable_irq - disable an interrupt source 245 * mac_clear_irq - clears a pending interrupt 246 * mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending) 247 * 248 * These routines are just dispatchers to the VIA/OSS/PSC routines. 249 */ 250 251 void mac_enable_irq(unsigned int irq) 252 { 253 int irq_src = IRQ_SRC(irq); 254 255 switch(irq_src) { 256 case 1: 257 via_irq_enable(irq); 258 break; 259 case 2: 260 case 7: 261 if (oss_present) 262 oss_irq_enable(irq); 263 else 264 via_irq_enable(irq); 265 break; 266 case 3: 267 case 5: 268 case 6: 269 if (psc_present) 270 psc_irq_enable(irq); 271 else if (oss_present) 272 oss_irq_enable(irq); 273 break; 274 case 4: 275 if (psc_present) 276 psc_irq_enable(irq); 277 break; 278 case 8: 279 if (baboon_present) 280 baboon_irq_enable(irq); 281 break; 282 } 283 } 284 285 void mac_disable_irq(unsigned int irq) 286 { 287 int irq_src = IRQ_SRC(irq); 288 289 switch(irq_src) { 290 case 1: 291 via_irq_disable(irq); 292 break; 293 case 2: 294 case 7: 295 if (oss_present) 296 oss_irq_disable(irq); 297 else 298 via_irq_disable(irq); 299 break; 300 case 3: 301 case 5: 302 case 6: 303 if (psc_present) 304 psc_irq_disable(irq); 305 else if (oss_present) 306 oss_irq_disable(irq); 307 break; 308 case 4: 309 if (psc_present) 310 psc_irq_disable(irq); 311 break; 312 case 8: 313 if (baboon_present) 314 baboon_irq_disable(irq); 315 break; 316 } 317 } 318 319 void mac_clear_irq(unsigned int irq) 320 { 321 switch(IRQ_SRC(irq)) { 322 case 1: 323 via_irq_clear(irq); 324 break; 325 case 2: 326 case 7: 327 if (oss_present) 328 oss_irq_clear(irq); 329 else 330 via_irq_clear(irq); 331 break; 332 case 3: 333 case 5: 334 case 6: 335 if (psc_present) 336 psc_irq_clear(irq); 337 else if (oss_present) 338 oss_irq_clear(irq); 339 break; 340 case 4: 341 if (psc_present) 342 psc_irq_clear(irq); 343 break; 344 case 8: 345 if (baboon_present) 346 baboon_irq_clear(irq); 347 break; 348 } 349 } 350 351 int mac_irq_pending(unsigned int irq) 352 { 353 switch(IRQ_SRC(irq)) { 354 case 1: 355 return via_irq_pending(irq); 356 case 2: 357 case 7: 358 if (oss_present) 359 return oss_irq_pending(irq); 360 else 361 return via_irq_pending(irq); 362 case 3: 363 case 5: 364 case 6: 365 if (psc_present) 366 return psc_irq_pending(irq); 367 else if (oss_present) 368 return oss_irq_pending(irq); 369 break; 370 case 4: 371 if (psc_present) 372 return psc_irq_pending(irq); 373 break; 374 } 375 return 0; 376 } 377 EXPORT_SYMBOL(mac_irq_pending); 378 379 static int num_debug[8]; 380 381 irqreturn_t mac_debug_handler(int irq, void *dev_id) 382 { 383 if (num_debug[irq] < 10) { 384 printk("DEBUG: Unexpected IRQ %d\n", irq); 385 num_debug[irq]++; 386 } 387 return IRQ_HANDLED; 388 } 389 390 static int in_nmi; 391 static volatile int nmi_hold; 392 393 irqreturn_t mac_nmi_handler(int irq, void *dev_id) 394 { 395 int i; 396 /* 397 * generate debug output on NMI switch if 'debug' kernel option given 398 * (only works with Penguin!) 399 */ 400 401 in_nmi++; 402 for (i=0; i<100; i++) 403 udelay(1000); 404 405 if (in_nmi == 1) { 406 nmi_hold = 1; 407 printk("... pausing, press NMI to resume ..."); 408 } else { 409 printk(" ok!\n"); 410 nmi_hold = 0; 411 } 412 413 barrier(); 414 415 while (nmi_hold == 1) 416 udelay(1000); 417 418 if (console_loglevel >= 8) { 419 #if 0 420 struct pt_regs *fp = get_irq_regs(); 421 show_state(); 422 printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp); 423 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", 424 fp->d0, fp->d1, fp->d2, fp->d3); 425 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", 426 fp->d4, fp->d5, fp->a0, fp->a1); 427 428 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page) 429 printk("Corrupted stack page\n"); 430 printk("Process %s (pid: %d, stackpage=%08lx)\n", 431 current->comm, current->pid, current->kernel_stack_page); 432 if (intr_count == 1) 433 dump_stack((struct frame *)fp); 434 #else 435 /* printk("NMI "); */ 436 #endif 437 } 438 in_nmi--; 439 return IRQ_HANDLED; 440 } 441