Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC |
| 3 | * found on INDY and Indigo2 workstations. |
| 4 | * |
| 5 | * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) |
| 6 | * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org) |
| 7 | * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) |
| 8 | * - Indigo2 changes |
| 9 | * - Interrupt handling fixes |
| 10 | * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org) |
| 11 | */ |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/kernel_stat.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/irq.h> |
| 20 | |
| 21 | #include <asm/mipsregs.h> |
| 22 | #include <asm/addrspace.h> |
| 23 | |
| 24 | #include <asm/sgi/ioc.h> |
| 25 | #include <asm/sgi/hpc3.h> |
| 26 | #include <asm/sgi/ip22.h> |
| 27 | |
| 28 | /* #define DEBUG_SGINT */ |
| 29 | |
| 30 | /* So far nothing hangs here */ |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 31 | #undef USE_LIO3_IRQ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | struct sgint_regs *sgint; |
| 34 | |
| 35 | static char lc0msk_to_irqnr[256]; |
| 36 | static char lc1msk_to_irqnr[256]; |
| 37 | static char lc2msk_to_irqnr[256]; |
| 38 | static char lc3msk_to_irqnr[256]; |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | extern int ip22_eisa_init(void); |
| 41 | |
| 42 | static void enable_local0_irq(unsigned int irq) |
| 43 | { |
| 44 | unsigned long flags; |
| 45 | |
| 46 | local_irq_save(flags); |
| 47 | /* don't allow mappable interrupt to be enabled from setup_irq, |
| 48 | * we have our own way to do so */ |
| 49 | if (irq != SGI_MAP_0_IRQ) |
| 50 | sgint->imask0 |= (1 << (irq - SGINT_LOCAL0)); |
| 51 | local_irq_restore(flags); |
| 52 | } |
| 53 | |
| 54 | static unsigned int startup_local0_irq(unsigned int irq) |
| 55 | { |
| 56 | enable_local0_irq(irq); |
| 57 | return 0; /* Never anything pending */ |
| 58 | } |
| 59 | |
| 60 | static void disable_local0_irq(unsigned int irq) |
| 61 | { |
| 62 | unsigned long flags; |
| 63 | |
| 64 | local_irq_save(flags); |
| 65 | sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0)); |
| 66 | local_irq_restore(flags); |
| 67 | } |
| 68 | |
| 69 | #define shutdown_local0_irq disable_local0_irq |
| 70 | #define mask_and_ack_local0_irq disable_local0_irq |
| 71 | |
| 72 | static void end_local0_irq (unsigned int irq) |
| 73 | { |
| 74 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 75 | enable_local0_irq(irq); |
| 76 | } |
| 77 | |
| 78 | static struct hw_interrupt_type ip22_local0_irq_type = { |
| 79 | .typename = "IP22 local 0", |
| 80 | .startup = startup_local0_irq, |
| 81 | .shutdown = shutdown_local0_irq, |
| 82 | .enable = enable_local0_irq, |
| 83 | .disable = disable_local0_irq, |
| 84 | .ack = mask_and_ack_local0_irq, |
| 85 | .end = end_local0_irq, |
| 86 | }; |
| 87 | |
| 88 | static void enable_local1_irq(unsigned int irq) |
| 89 | { |
| 90 | unsigned long flags; |
| 91 | |
| 92 | local_irq_save(flags); |
| 93 | /* don't allow mappable interrupt to be enabled from setup_irq, |
| 94 | * we have our own way to do so */ |
| 95 | if (irq != SGI_MAP_1_IRQ) |
| 96 | sgint->imask1 |= (1 << (irq - SGINT_LOCAL1)); |
| 97 | local_irq_restore(flags); |
| 98 | } |
| 99 | |
| 100 | static unsigned int startup_local1_irq(unsigned int irq) |
| 101 | { |
| 102 | enable_local1_irq(irq); |
| 103 | return 0; /* Never anything pending */ |
| 104 | } |
| 105 | |
| 106 | void disable_local1_irq(unsigned int irq) |
| 107 | { |
| 108 | unsigned long flags; |
| 109 | |
| 110 | local_irq_save(flags); |
| 111 | sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1)); |
| 112 | local_irq_restore(flags); |
| 113 | } |
| 114 | |
| 115 | #define shutdown_local1_irq disable_local1_irq |
| 116 | #define mask_and_ack_local1_irq disable_local1_irq |
| 117 | |
| 118 | static void end_local1_irq (unsigned int irq) |
| 119 | { |
| 120 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 121 | enable_local1_irq(irq); |
| 122 | } |
| 123 | |
| 124 | static struct hw_interrupt_type ip22_local1_irq_type = { |
| 125 | .typename = "IP22 local 1", |
| 126 | .startup = startup_local1_irq, |
| 127 | .shutdown = shutdown_local1_irq, |
| 128 | .enable = enable_local1_irq, |
| 129 | .disable = disable_local1_irq, |
| 130 | .ack = mask_and_ack_local1_irq, |
| 131 | .end = end_local1_irq, |
| 132 | }; |
| 133 | |
| 134 | static void enable_local2_irq(unsigned int irq) |
| 135 | { |
| 136 | unsigned long flags; |
| 137 | |
| 138 | local_irq_save(flags); |
| 139 | sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); |
| 140 | sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2)); |
| 141 | local_irq_restore(flags); |
| 142 | } |
| 143 | |
| 144 | static unsigned int startup_local2_irq(unsigned int irq) |
| 145 | { |
| 146 | enable_local2_irq(irq); |
| 147 | return 0; /* Never anything pending */ |
| 148 | } |
| 149 | |
| 150 | void disable_local2_irq(unsigned int irq) |
| 151 | { |
| 152 | unsigned long flags; |
| 153 | |
| 154 | local_irq_save(flags); |
| 155 | sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2)); |
| 156 | if (!sgint->cmeimask0) |
| 157 | sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); |
| 158 | local_irq_restore(flags); |
| 159 | } |
| 160 | |
| 161 | #define shutdown_local2_irq disable_local2_irq |
| 162 | #define mask_and_ack_local2_irq disable_local2_irq |
| 163 | |
| 164 | static void end_local2_irq (unsigned int irq) |
| 165 | { |
| 166 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 167 | enable_local2_irq(irq); |
| 168 | } |
| 169 | |
| 170 | static struct hw_interrupt_type ip22_local2_irq_type = { |
| 171 | .typename = "IP22 local 2", |
| 172 | .startup = startup_local2_irq, |
| 173 | .shutdown = shutdown_local2_irq, |
| 174 | .enable = enable_local2_irq, |
| 175 | .disable = disable_local2_irq, |
| 176 | .ack = mask_and_ack_local2_irq, |
| 177 | .end = end_local2_irq, |
| 178 | }; |
| 179 | |
| 180 | static void enable_local3_irq(unsigned int irq) |
| 181 | { |
| 182 | unsigned long flags; |
| 183 | |
| 184 | local_irq_save(flags); |
| 185 | sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); |
| 186 | sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3)); |
| 187 | local_irq_restore(flags); |
| 188 | } |
| 189 | |
| 190 | static unsigned int startup_local3_irq(unsigned int irq) |
| 191 | { |
| 192 | enable_local3_irq(irq); |
| 193 | return 0; /* Never anything pending */ |
| 194 | } |
| 195 | |
| 196 | void disable_local3_irq(unsigned int irq) |
| 197 | { |
| 198 | unsigned long flags; |
| 199 | |
| 200 | local_irq_save(flags); |
| 201 | sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3)); |
| 202 | if (!sgint->cmeimask1) |
| 203 | sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); |
| 204 | local_irq_restore(flags); |
| 205 | } |
| 206 | |
| 207 | #define shutdown_local3_irq disable_local3_irq |
| 208 | #define mask_and_ack_local3_irq disable_local3_irq |
| 209 | |
| 210 | static void end_local3_irq (unsigned int irq) |
| 211 | { |
| 212 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 213 | enable_local3_irq(irq); |
| 214 | } |
| 215 | |
| 216 | static struct hw_interrupt_type ip22_local3_irq_type = { |
| 217 | .typename = "IP22 local 3", |
| 218 | .startup = startup_local3_irq, |
| 219 | .shutdown = shutdown_local3_irq, |
| 220 | .enable = enable_local3_irq, |
| 221 | .disable = disable_local3_irq, |
| 222 | .ack = mask_and_ack_local3_irq, |
| 223 | .end = end_local3_irq, |
| 224 | }; |
| 225 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 226 | static void indy_local0_irqdispatch(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
| 228 | u8 mask = sgint->istat0 & sgint->imask0; |
| 229 | u8 mask2; |
| 230 | int irq; |
| 231 | |
| 232 | if (mask & SGINT_ISTAT0_LIO2) { |
| 233 | mask2 = sgint->vmeistat & sgint->cmeimask0; |
| 234 | irq = lc2msk_to_irqnr[mask2]; |
| 235 | } else |
| 236 | irq = lc0msk_to_irqnr[mask]; |
| 237 | |
| 238 | /* if irq == 0, then the interrupt has already been cleared */ |
| 239 | if (irq) |
| 240 | do_IRQ(irq, regs); |
| 241 | return; |
| 242 | } |
| 243 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 244 | static void indy_local1_irqdispatch(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | { |
| 246 | u8 mask = sgint->istat1 & sgint->imask1; |
| 247 | u8 mask2; |
| 248 | int irq; |
| 249 | |
| 250 | if (mask & SGINT_ISTAT1_LIO3) { |
| 251 | mask2 = sgint->vmeistat & sgint->cmeimask1; |
| 252 | irq = lc3msk_to_irqnr[mask2]; |
| 253 | } else |
| 254 | irq = lc1msk_to_irqnr[mask]; |
| 255 | |
| 256 | /* if irq == 0, then the interrupt has already been cleared */ |
| 257 | if (irq) |
| 258 | do_IRQ(irq, regs); |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | extern void ip22_be_interrupt(int irq, struct pt_regs *regs); |
| 263 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 264 | static void indy_buserror_irq(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | { |
| 266 | int irq = SGI_BUSERR_IRQ; |
| 267 | |
| 268 | irq_enter(); |
| 269 | kstat_this_cpu.irqs[irq]++; |
| 270 | ip22_be_interrupt(irq, regs); |
| 271 | irq_exit(); |
| 272 | } |
| 273 | |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 274 | static struct irqaction local0_cascade = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | .handler = no_action, |
| 276 | .flags = SA_INTERRUPT, |
| 277 | .name = "local0 cascade", |
| 278 | }; |
| 279 | |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 280 | static struct irqaction local1_cascade = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | .handler = no_action, |
| 282 | .flags = SA_INTERRUPT, |
| 283 | .name = "local1 cascade", |
| 284 | }; |
| 285 | |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 286 | static struct irqaction buserr = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | .handler = no_action, |
| 288 | .flags = SA_INTERRUPT, |
| 289 | .name = "Bus Error", |
| 290 | }; |
| 291 | |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 292 | static struct irqaction map0_cascade = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | .handler = no_action, |
| 294 | .flags = SA_INTERRUPT, |
| 295 | .name = "mapable0 cascade", |
| 296 | }; |
| 297 | |
| 298 | #ifdef USE_LIO3_IRQ |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 299 | static struct irqaction map1_cascade = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | .handler = no_action, |
| 301 | .flags = SA_INTERRUPT, |
| 302 | .name = "mapable1 cascade", |
| 303 | }; |
| 304 | #define SGI_INTERRUPTS SGINT_END |
| 305 | #else |
| 306 | #define SGI_INTERRUPTS SGINT_LOCAL3 |
| 307 | #endif |
| 308 | |
Ralf Baechle | e4ac58a | 2006-04-03 17:56:36 +0100 | [diff] [blame] | 309 | extern void indy_r4k_timer_interrupt(struct pt_regs *regs); |
| 310 | extern void indy_8254timer_irq(struct pt_regs *regs); |
| 311 | |
| 312 | /* |
| 313 | * IRQs on the INDY look basically (barring software IRQs which we don't use |
| 314 | * at all) like: |
| 315 | * |
| 316 | * MIPS IRQ Source |
| 317 | * -------- ------ |
| 318 | * 0 Software (ignored) |
| 319 | * 1 Software (ignored) |
| 320 | * 2 Local IRQ level zero |
| 321 | * 3 Local IRQ level one |
| 322 | * 4 8254 Timer zero |
| 323 | * 5 8254 Timer one |
| 324 | * 6 Bus Error |
| 325 | * 7 R4k timer (what we use) |
| 326 | * |
| 327 | * We handle the IRQ according to _our_ priority which is: |
| 328 | * |
| 329 | * Highest ---- R4k Timer |
| 330 | * Local IRQ zero |
| 331 | * Local IRQ one |
| 332 | * Bus Error |
| 333 | * 8254 Timer zero |
| 334 | * Lowest ---- 8254 Timer one |
| 335 | * |
| 336 | * then we just return, if multiple IRQs are pending then we will just take |
| 337 | * another exception, big deal. |
| 338 | */ |
| 339 | |
| 340 | asmlinkage void plat_irq_dispatch(struct pt_regs *regs) |
| 341 | { |
| 342 | unsigned int pending = read_c0_cause(); |
| 343 | |
| 344 | /* |
| 345 | * First we check for r4k counter/timer IRQ. |
| 346 | */ |
| 347 | if (pending & CAUSEF_IP7) |
| 348 | indy_r4k_timer_interrupt(regs); |
| 349 | else if (pending & CAUSEF_IP2) |
| 350 | indy_local0_irqdispatch(regs); |
| 351 | else if (pending & CAUSEF_IP3) |
| 352 | indy_local1_irqdispatch(regs); |
| 353 | else if (pending & CAUSEF_IP6) |
| 354 | indy_buserror_irq(regs); |
| 355 | else if (pending & (CAUSEF_IP4 | CAUSEF_IP5)) |
| 356 | indy_8254timer_irq(regs); |
| 357 | } |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | extern void mips_cpu_irq_init(unsigned int irq_base); |
| 360 | |
| 361 | void __init arch_init_irq(void) |
| 362 | { |
| 363 | int i; |
| 364 | |
| 365 | /* Init local mask --> irq tables. */ |
| 366 | for (i = 0; i < 256; i++) { |
| 367 | if (i & 0x80) { |
| 368 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7; |
| 369 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7; |
| 370 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7; |
| 371 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7; |
| 372 | } else if (i & 0x40) { |
| 373 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6; |
| 374 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6; |
| 375 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6; |
| 376 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6; |
| 377 | } else if (i & 0x20) { |
| 378 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5; |
| 379 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5; |
| 380 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5; |
| 381 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5; |
| 382 | } else if (i & 0x10) { |
| 383 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4; |
| 384 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4; |
| 385 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4; |
| 386 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4; |
| 387 | } else if (i & 0x08) { |
| 388 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3; |
| 389 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3; |
| 390 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3; |
| 391 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3; |
| 392 | } else if (i & 0x04) { |
| 393 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2; |
| 394 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2; |
| 395 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2; |
| 396 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2; |
| 397 | } else if (i & 0x02) { |
| 398 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1; |
| 399 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1; |
| 400 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1; |
| 401 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1; |
| 402 | } else if (i & 0x01) { |
| 403 | lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0; |
| 404 | lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0; |
| 405 | lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0; |
| 406 | lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0; |
| 407 | } else { |
| 408 | lc0msk_to_irqnr[i] = 0; |
| 409 | lc1msk_to_irqnr[i] = 0; |
| 410 | lc2msk_to_irqnr[i] = 0; |
| 411 | lc3msk_to_irqnr[i] = 0; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | /* Mask out all interrupts. */ |
| 416 | sgint->imask0 = 0; |
| 417 | sgint->imask1 = 0; |
| 418 | sgint->cmeimask0 = 0; |
| 419 | sgint->cmeimask1 = 0; |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* init CPU irqs */ |
| 422 | mips_cpu_irq_init(SGINT_CPU); |
| 423 | |
| 424 | for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) { |
| 425 | hw_irq_controller *handler; |
| 426 | |
| 427 | if (i < SGINT_LOCAL1) |
| 428 | handler = &ip22_local0_irq_type; |
| 429 | else if (i < SGINT_LOCAL2) |
| 430 | handler = &ip22_local1_irq_type; |
| 431 | else if (i < SGINT_LOCAL3) |
| 432 | handler = &ip22_local2_irq_type; |
| 433 | else |
| 434 | handler = &ip22_local3_irq_type; |
| 435 | |
| 436 | irq_desc[i].status = IRQ_DISABLED; |
| 437 | irq_desc[i].action = 0; |
| 438 | irq_desc[i].depth = 1; |
| 439 | irq_desc[i].handler = handler; |
| 440 | } |
| 441 | |
| 442 | /* vector handler. this register the IRQ as non-sharable */ |
| 443 | setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade); |
| 444 | setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade); |
| 445 | setup_irq(SGI_BUSERR_IRQ, &buserr); |
| 446 | |
| 447 | /* cascade in cascade. i love Indy ;-) */ |
| 448 | setup_irq(SGI_MAP_0_IRQ, &map0_cascade); |
| 449 | #ifdef USE_LIO3_IRQ |
| 450 | setup_irq(SGI_MAP_1_IRQ, &map1_cascade); |
| 451 | #endif |
| 452 | |
| 453 | #ifdef CONFIG_EISA |
| 454 | if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */ |
| 455 | ip22_eisa_init (); |
| 456 | #endif |
| 457 | } |