1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2004-2008, 2009, 2010 Cavium Networks 7 */ 8#include <linux/irq.h> 9#include <linux/interrupt.h> 10#include <linux/smp.h> 11 12#include <asm/octeon/octeon.h> 13 14static DEFINE_RAW_SPINLOCK(octeon_irq_ciu0_lock); 15static DEFINE_RAW_SPINLOCK(octeon_irq_ciu1_lock); 16 17static int octeon_coreid_for_cpu(int cpu) 18{ 19#ifdef CONFIG_SMP 20 return cpu_logical_map(cpu); 21#else 22 return cvmx_get_core_num(); 23#endif 24} 25 26static void octeon_irq_core_ack(unsigned int irq) 27{ 28 unsigned int bit = irq - OCTEON_IRQ_SW0; 29 /* 30 * We don't need to disable IRQs to make these atomic since 31 * they are already disabled earlier in the low level 32 * interrupt code. 33 */ 34 clear_c0_status(0x100 << bit); 35 /* The two user interrupts must be cleared manually. */ 36 if (bit < 2) 37 clear_c0_cause(0x100 << bit); 38} 39 40static void octeon_irq_core_eoi(unsigned int irq) 41{ 42 struct irq_desc *desc = irq_to_desc(irq); 43 unsigned int bit = irq - OCTEON_IRQ_SW0; 44 /* 45 * If an IRQ is being processed while we are disabling it the 46 * handler will attempt to unmask the interrupt after it has 47 * been disabled. 48 */ 49 if ((unlikely(desc->status & IRQ_DISABLED))) 50 return; 51 /* 52 * We don't need to disable IRQs to make these atomic since 53 * they are already disabled earlier in the low level 54 * interrupt code. 55 */ 56 set_c0_status(0x100 << bit); 57} 58 59static void octeon_irq_core_enable(unsigned int irq) 60{ 61 unsigned long flags; 62 unsigned int bit = irq - OCTEON_IRQ_SW0; 63 64 /* 65 * We need to disable interrupts to make sure our updates are 66 * atomic. 67 */ 68 local_irq_save(flags); 69 set_c0_status(0x100 << bit); 70 local_irq_restore(flags); 71} 72 73static void octeon_irq_core_disable_local(unsigned int irq) 74{ 75 unsigned long flags; 76 unsigned int bit = irq - OCTEON_IRQ_SW0; 77 /* 78 * We need to disable interrupts to make sure our updates are 79 * atomic. 80 */ 81 local_irq_save(flags); 82 clear_c0_status(0x100 << bit); 83 local_irq_restore(flags); 84} 85 86static void octeon_irq_core_disable(unsigned int irq) 87{ 88#ifdef CONFIG_SMP 89 on_each_cpu((void (*)(void *)) octeon_irq_core_disable_local, 90 (void *) (long) irq, 1); 91#else 92 octeon_irq_core_disable_local(irq); 93#endif 94} 95 96static struct irq_chip octeon_irq_chip_core = { 97 .name = "Core", 98 .enable = octeon_irq_core_enable, 99 .disable = octeon_irq_core_disable, 100 .ack = octeon_irq_core_ack, 101 .eoi = octeon_irq_core_eoi, 102}; 103 104 105static void octeon_irq_ciu0_ack(unsigned int irq) 106{ 107 switch (irq) { 108 case OCTEON_IRQ_GMX_DRP0: 109 case OCTEON_IRQ_GMX_DRP1: 110 case OCTEON_IRQ_IPD_DRP: 111 case OCTEON_IRQ_KEY_ZERO: 112 case OCTEON_IRQ_TIMER0: 113 case OCTEON_IRQ_TIMER1: 114 case OCTEON_IRQ_TIMER2: 115 case OCTEON_IRQ_TIMER3: 116 { 117 int index = cvmx_get_core_num() * 2; 118 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 119 /* 120 * CIU timer type interrupts must be acknoleged by 121 * writing a '1' bit to their sum0 bit. 122 */ 123 cvmx_write_csr(CVMX_CIU_INTX_SUM0(index), mask); 124 break; 125 } 126 default: 127 break; 128 } 129 130 /* 131 * In order to avoid any locking accessing the CIU, we 132 * acknowledge CIU interrupts by disabling all of them. This 133 * way we can use a per core register and avoid any out of 134 * core locking requirements. This has the side affect that 135 * CIU interrupts can't be processed recursively. 136 * 137 * We don't need to disable IRQs to make these atomic since 138 * they are already disabled earlier in the low level 139 * interrupt code. 140 */ 141 clear_c0_status(0x100 << 2); 142} 143 144static void octeon_irq_ciu0_eoi(unsigned int irq) 145{ 146 /* 147 * Enable all CIU interrupts again. We don't need to disable 148 * IRQs to make these atomic since they are already disabled 149 * earlier in the low level interrupt code. 150 */ 151 set_c0_status(0x100 << 2); 152} 153 154static int next_coreid_for_irq(struct irq_desc *desc) 155{ 156 157#ifdef CONFIG_SMP 158 int coreid; 159 int weight = cpumask_weight(desc->affinity); 160 161 if (weight > 1) { 162 int cpu = smp_processor_id(); 163 for (;;) { 164 cpu = cpumask_next(cpu, desc->affinity); 165 if (cpu >= nr_cpu_ids) { 166 cpu = -1; 167 continue; 168 } else if (cpumask_test_cpu(cpu, cpu_online_mask)) { 169 break; 170 } 171 } 172 coreid = octeon_coreid_for_cpu(cpu); 173 } else if (weight == 1) { 174 coreid = octeon_coreid_for_cpu(cpumask_first(desc->affinity)); 175 } else { 176 coreid = cvmx_get_core_num(); 177 } 178 return coreid; 179#else 180 return cvmx_get_core_num(); 181#endif 182} 183 184static void octeon_irq_ciu0_enable(unsigned int irq) 185{ 186 struct irq_desc *desc = irq_to_desc(irq); 187 int coreid = next_coreid_for_irq(desc); 188 unsigned long flags; 189 uint64_t en0; 190 int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */ 191 192 raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags); 193 en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 194 en0 |= 1ull << bit; 195 cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0); 196 cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 197 raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags); 198} 199 200static void octeon_irq_ciu0_enable_mbox(unsigned int irq) 201{ 202 int coreid = cvmx_get_core_num(); 203 unsigned long flags; 204 uint64_t en0; 205 int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */ 206 207 raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags); 208 en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 209 en0 |= 1ull << bit; 210 cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0); 211 cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 212 raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags); 213} 214 215static void octeon_irq_ciu0_disable(unsigned int irq) 216{ 217 int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */ 218 unsigned long flags; 219 uint64_t en0; 220 int cpu; 221 raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags); 222 for_each_online_cpu(cpu) { 223 int coreid = octeon_coreid_for_cpu(cpu); 224 en0 = cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 225 en0 &= ~(1ull << bit); 226 cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0); 227 } 228 /* 229 * We need to do a read after the last update to make sure all 230 * of them are done. 231 */ 232 cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2)); 233 raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags); 234} 235 236/* 237 * Enable the irq on the next core in the affinity set for chips that 238 * have the EN*_W1{S,C} registers. 239 */ 240static void octeon_irq_ciu0_enable_v2(unsigned int irq) 241{ 242 int index; 243 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 244 struct irq_desc *desc = irq_to_desc(irq); 245 246 if ((desc->status & IRQ_DISABLED) == 0) { 247 index = next_coreid_for_irq(desc) * 2; 248 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask); 249 } 250} 251 252/* 253 * Enable the irq on the current CPU for chips that 254 * have the EN*_W1{S,C} registers. 255 */ 256static void octeon_irq_ciu0_enable_mbox_v2(unsigned int irq) 257{ 258 int index; 259 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 260 261 index = cvmx_get_core_num() * 2; 262 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask); 263} 264 265/* 266 * Disable the irq on the current core for chips that have the EN*_W1{S,C} 267 * registers. 268 */ 269static void octeon_irq_ciu0_ack_v2(unsigned int irq) 270{ 271 int index = cvmx_get_core_num() * 2; 272 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 273 274 switch (irq) { 275 case OCTEON_IRQ_GMX_DRP0: 276 case OCTEON_IRQ_GMX_DRP1: 277 case OCTEON_IRQ_IPD_DRP: 278 case OCTEON_IRQ_KEY_ZERO: 279 case OCTEON_IRQ_TIMER0: 280 case OCTEON_IRQ_TIMER1: 281 case OCTEON_IRQ_TIMER2: 282 case OCTEON_IRQ_TIMER3: 283 /* 284 * CIU timer type interrupts must be acknoleged by 285 * writing a '1' bit to their sum0 bit. 286 */ 287 cvmx_write_csr(CVMX_CIU_INTX_SUM0(index), mask); 288 break; 289 default: 290 break; 291 } 292 293 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask); 294} 295 296/* 297 * Enable the irq on the current core for chips that have the EN*_W1{S,C} 298 * registers. 299 */ 300static void octeon_irq_ciu0_eoi_mbox_v2(unsigned int irq) 301{ 302 struct irq_desc *desc = irq_to_desc(irq); 303 int index = cvmx_get_core_num() * 2; 304 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 305 306 if (likely((desc->status & IRQ_DISABLED) == 0)) 307 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask); 308} 309 310/* 311 * Disable the irq on the all cores for chips that have the EN*_W1{S,C} 312 * registers. 313 */ 314static void octeon_irq_ciu0_disable_all_v2(unsigned int irq) 315{ 316 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 317 int index; 318 int cpu; 319 for_each_online_cpu(cpu) { 320 index = octeon_coreid_for_cpu(cpu) * 2; 321 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask); 322 } 323} 324 325#ifdef CONFIG_SMP 326static int octeon_irq_ciu0_set_affinity(unsigned int irq, const struct cpumask *dest) 327{ 328 int cpu; 329 struct irq_desc *desc = irq_to_desc(irq); 330 int enable_one = (desc->status & IRQ_DISABLED) == 0; 331 unsigned long flags; 332 int bit = irq - OCTEON_IRQ_WORKQ0; /* Bit 0-63 of EN0 */ 333 334 /* 335 * For non-v2 CIU, we will allow only single CPU affinity. 336 * This removes the need to do locking in the .ack/.eoi 337 * functions. 338 */ 339 if (cpumask_weight(dest) != 1) 340 return -EINVAL; 341 342 raw_spin_lock_irqsave(&octeon_irq_ciu0_lock, flags); 343 for_each_online_cpu(cpu) { 344 int coreid = octeon_coreid_for_cpu(cpu); 345 uint64_t en0 = 346 cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)); 347 if (cpumask_test_cpu(cpu, dest) && enable_one) { 348 enable_one = 0; 349 en0 |= 1ull << bit; 350 } else { 351 en0 &= ~(1ull << bit); 352 } 353 cvmx_write_csr(CVMX_CIU_INTX_EN0(coreid * 2), en0); 354 } 355 /* 356 * We need to do a read after the last update to make sure all 357 * of them are done. 358 */ 359 cvmx_read_csr(CVMX_CIU_INTX_EN0(cvmx_get_core_num() * 2)); 360 raw_spin_unlock_irqrestore(&octeon_irq_ciu0_lock, flags); 361 362 return 0; 363} 364 365/* 366 * Set affinity for the irq for chips that have the EN*_W1{S,C} 367 * registers. 368 */ 369static int octeon_irq_ciu0_set_affinity_v2(unsigned int irq, 370 const struct cpumask *dest) 371{ 372 int cpu; 373 int index; 374 struct irq_desc *desc = irq_to_desc(irq); 375 int enable_one = (desc->status & IRQ_DISABLED) == 0; 376 u64 mask = 1ull << (irq - OCTEON_IRQ_WORKQ0); 377 378 for_each_online_cpu(cpu) { 379 index = octeon_coreid_for_cpu(cpu) * 2; 380 if (cpumask_test_cpu(cpu, dest) && enable_one) { 381 enable_one = 0; 382 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1S(index), mask); 383 } else { 384 cvmx_write_csr(CVMX_CIU_INTX_EN0_W1C(index), mask); 385 } 386 } 387 return 0; 388} 389#endif 390 391/* 392 * Newer octeon chips have support for lockless CIU operation. 393 */ 394static struct irq_chip octeon_irq_chip_ciu0_v2 = { 395 .name = "CIU0", 396 .enable = octeon_irq_ciu0_enable_v2, 397 .disable = octeon_irq_ciu0_disable_all_v2, 398 .eoi = octeon_irq_ciu0_enable_v2, 399#ifdef CONFIG_SMP 400 .set_affinity = octeon_irq_ciu0_set_affinity_v2, 401#endif 402}; 403 404static struct irq_chip octeon_irq_chip_ciu0 = { 405 .name = "CIU0", 406 .enable = octeon_irq_ciu0_enable, 407 .disable = octeon_irq_ciu0_disable, 408 .eoi = octeon_irq_ciu0_eoi, 409#ifdef CONFIG_SMP 410 .set_affinity = octeon_irq_ciu0_set_affinity, 411#endif 412}; 413 414/* The mbox versions don't do any affinity or round-robin. */ 415static struct irq_chip octeon_irq_chip_ciu0_mbox_v2 = { 416 .name = "CIU0-M", 417 .enable = octeon_irq_ciu0_enable_mbox_v2, 418 .disable = octeon_irq_ciu0_disable, 419 .eoi = octeon_irq_ciu0_eoi_mbox_v2, 420}; 421 422static struct irq_chip octeon_irq_chip_ciu0_mbox = { 423 .name = "CIU0-M", 424 .enable = octeon_irq_ciu0_enable_mbox, 425 .disable = octeon_irq_ciu0_disable, 426 .eoi = octeon_irq_ciu0_eoi, 427}; 428 429static void octeon_irq_ciu1_ack(unsigned int irq) 430{ 431 /* 432 * In order to avoid any locking accessing the CIU, we 433 * acknowledge CIU interrupts by disabling all of them. This 434 * way we can use a per core register and avoid any out of 435 * core locking requirements. This has the side affect that 436 * CIU interrupts can't be processed recursively. We don't 437 * need to disable IRQs to make these atomic since they are 438 * already disabled earlier in the low level interrupt code. 439 */ 440 clear_c0_status(0x100 << 3); 441} 442 443static void octeon_irq_ciu1_eoi(unsigned int irq) 444{ 445 /* 446 * Enable all CIU interrupts again. We don't need to disable 447 * IRQs to make these atomic since they are already disabled 448 * earlier in the low level interrupt code. 449 */ 450 set_c0_status(0x100 << 3); 451} 452 453static void octeon_irq_ciu1_enable(unsigned int irq) 454{ 455 struct irq_desc *desc = irq_to_desc(irq); 456 int coreid = next_coreid_for_irq(desc); 457 unsigned long flags; 458 uint64_t en1; 459 int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */ 460 461 raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags); 462 en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 463 en1 |= 1ull << bit; 464 cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1); 465 cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 466 raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags); 467} 468 469/* 470 * Watchdog interrupts are special. They are associated with a single 471 * core, so we hardwire the affinity to that core. 472 */ 473static void octeon_irq_ciu1_wd_enable(unsigned int irq) 474{ 475 unsigned long flags; 476 uint64_t en1; 477 int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */ 478 int coreid = bit; 479 480 raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags); 481 en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 482 en1 |= 1ull << bit; 483 cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1); 484 cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 485 raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags); 486} 487 488static void octeon_irq_ciu1_disable(unsigned int irq) 489{ 490 int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */ 491 unsigned long flags; 492 uint64_t en1; 493 int cpu; 494 raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags); 495 for_each_online_cpu(cpu) { 496 int coreid = octeon_coreid_for_cpu(cpu); 497 en1 = cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 498 en1 &= ~(1ull << bit); 499 cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1); 500 } 501 /* 502 * We need to do a read after the last update to make sure all 503 * of them are done. 504 */ 505 cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1)); 506 raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags); 507} 508 509/* 510 * Enable the irq on the current core for chips that have the EN*_W1{S,C} 511 * registers. 512 */ 513static void octeon_irq_ciu1_enable_v2(unsigned int irq) 514{ 515 int index; 516 u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0); 517 struct irq_desc *desc = irq_to_desc(irq); 518 519 if ((desc->status & IRQ_DISABLED) == 0) { 520 index = next_coreid_for_irq(desc) * 2 + 1; 521 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask); 522 } 523} 524 525/* 526 * Watchdog interrupts are special. They are associated with a single 527 * core, so we hardwire the affinity to that core. 528 */ 529static void octeon_irq_ciu1_wd_enable_v2(unsigned int irq) 530{ 531 int index; 532 int coreid = irq - OCTEON_IRQ_WDOG0; 533 u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0); 534 struct irq_desc *desc = irq_to_desc(irq); 535 536 if ((desc->status & IRQ_DISABLED) == 0) { 537 index = coreid * 2 + 1; 538 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask); 539 } 540} 541 542/* 543 * Disable the irq on the current core for chips that have the EN*_W1{S,C} 544 * registers. 545 */ 546static void octeon_irq_ciu1_ack_v2(unsigned int irq) 547{ 548 int index = cvmx_get_core_num() * 2 + 1; 549 u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0); 550 551 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask); 552} 553 554/* 555 * Disable the irq on the all cores for chips that have the EN*_W1{S,C} 556 * registers. 557 */ 558static void octeon_irq_ciu1_disable_all_v2(unsigned int irq) 559{ 560 u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0); 561 int index; 562 int cpu; 563 for_each_online_cpu(cpu) { 564 index = octeon_coreid_for_cpu(cpu) * 2 + 1; 565 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask); 566 } 567} 568 569#ifdef CONFIG_SMP 570static int octeon_irq_ciu1_set_affinity(unsigned int irq, 571 const struct cpumask *dest) 572{ 573 int cpu; 574 struct irq_desc *desc = irq_to_desc(irq); 575 int enable_one = (desc->status & IRQ_DISABLED) == 0; 576 unsigned long flags; 577 int bit = irq - OCTEON_IRQ_WDOG0; /* Bit 0-63 of EN1 */ 578 579 /* 580 * For non-v2 CIU, we will allow only single CPU affinity. 581 * This removes the need to do locking in the .ack/.eoi 582 * functions. 583 */ 584 if (cpumask_weight(dest) != 1) 585 return -EINVAL; 586 587 raw_spin_lock_irqsave(&octeon_irq_ciu1_lock, flags); 588 for_each_online_cpu(cpu) { 589 int coreid = octeon_coreid_for_cpu(cpu); 590 uint64_t en1 = 591 cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)); 592 if (cpumask_test_cpu(cpu, dest) && enable_one) { 593 enable_one = 0; 594 en1 |= 1ull << bit; 595 } else { 596 en1 &= ~(1ull << bit); 597 } 598 cvmx_write_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1), en1); 599 } 600 /* 601 * We need to do a read after the last update to make sure all 602 * of them are done. 603 */ 604 cvmx_read_csr(CVMX_CIU_INTX_EN1(cvmx_get_core_num() * 2 + 1)); 605 raw_spin_unlock_irqrestore(&octeon_irq_ciu1_lock, flags); 606 607 return 0; 608} 609 610/* 611 * Set affinity for the irq for chips that have the EN*_W1{S,C} 612 * registers. 613 */ 614static int octeon_irq_ciu1_set_affinity_v2(unsigned int irq, 615 const struct cpumask *dest) 616{ 617 int cpu; 618 int index; 619 struct irq_desc *desc = irq_to_desc(irq); 620 int enable_one = (desc->status & IRQ_DISABLED) == 0; 621 u64 mask = 1ull << (irq - OCTEON_IRQ_WDOG0); 622 for_each_online_cpu(cpu) { 623 index = octeon_coreid_for_cpu(cpu) * 2 + 1; 624 if (cpumask_test_cpu(cpu, dest) && enable_one) { 625 enable_one = 0; 626 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1S(index), mask); 627 } else { 628 cvmx_write_csr(CVMX_CIU_INTX_EN1_W1C(index), mask); 629 } 630 } 631 return 0; 632} 633#endif 634 635/* 636 * Newer octeon chips have support for lockless CIU operation. 637 */ 638static struct irq_chip octeon_irq_chip_ciu1_v2 = { 639 .name = "CIU1", 640 .enable = octeon_irq_ciu1_enable_v2, 641 .disable = octeon_irq_ciu1_disable_all_v2, 642 .eoi = octeon_irq_ciu1_enable_v2, 643#ifdef CONFIG_SMP 644 .set_affinity = octeon_irq_ciu1_set_affinity_v2, 645#endif 646}; 647 648static struct irq_chip octeon_irq_chip_ciu1 = { 649 .name = "CIU1", 650 .enable = octeon_irq_ciu1_enable, 651 .disable = octeon_irq_ciu1_disable, 652 .eoi = octeon_irq_ciu1_eoi, 653#ifdef CONFIG_SMP 654 .set_affinity = octeon_irq_ciu1_set_affinity, 655#endif 656}; 657 658static struct irq_chip octeon_irq_chip_ciu1_wd_v2 = { 659 .name = "CIU1-W", 660 .enable = octeon_irq_ciu1_wd_enable_v2, 661 .disable = octeon_irq_ciu1_disable_all_v2, 662 .eoi = octeon_irq_ciu1_wd_enable_v2, 663}; 664 665static struct irq_chip octeon_irq_chip_ciu1_wd = { 666 .name = "CIU1-W", 667 .enable = octeon_irq_ciu1_wd_enable, 668 .disable = octeon_irq_ciu1_disable, 669 .eoi = octeon_irq_ciu1_eoi, 670}; 671 672static void (*octeon_ciu0_ack)(unsigned int); 673static void (*octeon_ciu1_ack)(unsigned int); 674 675void __init arch_init_irq(void) 676{ 677 unsigned int irq; 678 struct irq_chip *chip0; 679 struct irq_chip *chip0_mbox; 680 struct irq_chip *chip1; 681 struct irq_chip *chip1_wd; 682 683#ifdef CONFIG_SMP 684 /* Set the default affinity to the boot cpu. */ 685 cpumask_clear(irq_default_affinity); 686 cpumask_set_cpu(smp_processor_id(), irq_default_affinity); 687#endif 688 689 if (NR_IRQS < OCTEON_IRQ_LAST) 690 pr_err("octeon_irq_init: NR_IRQS is set too low\n"); 691 692 if (OCTEON_IS_MODEL(OCTEON_CN58XX_PASS2_X) || 693 OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) || 694 OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X)) { 695 octeon_ciu0_ack = octeon_irq_ciu0_ack_v2; 696 octeon_ciu1_ack = octeon_irq_ciu1_ack_v2; 697 chip0 = &octeon_irq_chip_ciu0_v2; 698 chip0_mbox = &octeon_irq_chip_ciu0_mbox_v2; 699 chip1 = &octeon_irq_chip_ciu1_v2; 700 chip1_wd = &octeon_irq_chip_ciu1_wd_v2; 701 } else { 702 octeon_ciu0_ack = octeon_irq_ciu0_ack; 703 octeon_ciu1_ack = octeon_irq_ciu1_ack; 704 chip0 = &octeon_irq_chip_ciu0; 705 chip0_mbox = &octeon_irq_chip_ciu0_mbox; 706 chip1 = &octeon_irq_chip_ciu1; 707 chip1_wd = &octeon_irq_chip_ciu1_wd; 708 } 709 710 /* 0 - 15 reserved for i8259 master and slave controller. */ 711 712 /* 17 - 23 Mips internal */ 713 for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++) { 714 set_irq_chip_and_handler(irq, &octeon_irq_chip_core, 715 handle_percpu_irq); 716 } 717 718 /* 24 - 87 CIU_INT_SUM0 */ 719 for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_BOOTDMA; irq++) { 720 switch (irq) { 721 case OCTEON_IRQ_MBOX0: 722 case OCTEON_IRQ_MBOX1: 723 set_irq_chip_and_handler(irq, chip0_mbox, handle_percpu_irq); 724 break; 725 default: 726 set_irq_chip_and_handler(irq, chip0, handle_fasteoi_irq); 727 break; 728 } 729 } 730 731 /* 88 - 151 CIU_INT_SUM1 */ 732 for (irq = OCTEON_IRQ_WDOG0; irq <= OCTEON_IRQ_WDOG15; irq++) 733 set_irq_chip_and_handler(irq, chip1_wd, handle_fasteoi_irq); 734 735 for (irq = OCTEON_IRQ_UART2; irq <= OCTEON_IRQ_RESERVED151; irq++) 736 set_irq_chip_and_handler(irq, chip1, handle_fasteoi_irq); 737 738 set_c0_status(0x300 << 2); 739} 740 741asmlinkage void plat_irq_dispatch(void) 742{ 743 const unsigned long core_id = cvmx_get_core_num(); 744 const uint64_t ciu_sum0_address = CVMX_CIU_INTX_SUM0(core_id * 2); 745 const uint64_t ciu_en0_address = CVMX_CIU_INTX_EN0(core_id * 2); 746 const uint64_t ciu_sum1_address = CVMX_CIU_INT_SUM1; 747 const uint64_t ciu_en1_address = CVMX_CIU_INTX_EN1(core_id * 2 + 1); 748 unsigned long cop0_cause; 749 unsigned long cop0_status; 750 uint64_t ciu_en; 751 uint64_t ciu_sum; 752 unsigned int irq; 753 754 while (1) { 755 cop0_cause = read_c0_cause(); 756 cop0_status = read_c0_status(); 757 cop0_cause &= cop0_status; 758 cop0_cause &= ST0_IM; 759 760 if (unlikely(cop0_cause & STATUSF_IP2)) { 761 ciu_sum = cvmx_read_csr(ciu_sum0_address); 762 ciu_en = cvmx_read_csr(ciu_en0_address); 763 ciu_sum &= ciu_en; 764 if (likely(ciu_sum)) { 765 irq = fls64(ciu_sum) + OCTEON_IRQ_WORKQ0 - 1; 766 octeon_ciu0_ack(irq); 767 do_IRQ(irq); 768 } else { 769 spurious_interrupt(); 770 } 771 } else if (unlikely(cop0_cause & STATUSF_IP3)) { 772 ciu_sum = cvmx_read_csr(ciu_sum1_address); 773 ciu_en = cvmx_read_csr(ciu_en1_address); 774 ciu_sum &= ciu_en; 775 if (likely(ciu_sum)) { 776 irq = fls64(ciu_sum) + OCTEON_IRQ_WDOG0 - 1; 777 octeon_ciu1_ack(irq); 778 do_IRQ(irq); 779 } else { 780 spurious_interrupt(); 781 } 782 } else if (likely(cop0_cause)) { 783 do_IRQ(fls(cop0_cause) - 9 + MIPS_CPU_IRQ_BASE); 784 } else { 785 break; 786 } 787 } 788} 789 790#ifdef CONFIG_HOTPLUG_CPU 791 792void fixup_irqs(void) 793{ 794 int irq; 795 struct irq_desc *desc; 796 cpumask_t new_affinity; 797 unsigned long flags; 798 int do_set_affinity; 799 int cpu; 800 801 cpu = smp_processor_id(); 802 803 for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++) 804 octeon_irq_core_disable_local(irq); 805 806 for (irq = OCTEON_IRQ_WORKQ0; irq < OCTEON_IRQ_LAST; irq++) { 807 desc = irq_to_desc(irq); 808 switch (irq) { 809 case OCTEON_IRQ_MBOX0: 810 case OCTEON_IRQ_MBOX1: 811 /* The eoi function will disable them on this CPU. */ 812 desc->chip->eoi(irq); 813 break; 814 case OCTEON_IRQ_WDOG0: 815 case OCTEON_IRQ_WDOG1: 816 case OCTEON_IRQ_WDOG2: 817 case OCTEON_IRQ_WDOG3: 818 case OCTEON_IRQ_WDOG4: 819 case OCTEON_IRQ_WDOG5: 820 case OCTEON_IRQ_WDOG6: 821 case OCTEON_IRQ_WDOG7: 822 case OCTEON_IRQ_WDOG8: 823 case OCTEON_IRQ_WDOG9: 824 case OCTEON_IRQ_WDOG10: 825 case OCTEON_IRQ_WDOG11: 826 case OCTEON_IRQ_WDOG12: 827 case OCTEON_IRQ_WDOG13: 828 case OCTEON_IRQ_WDOG14: 829 case OCTEON_IRQ_WDOG15: 830 /* 831 * These have special per CPU semantics and 832 * are handled in the watchdog driver. 833 */ 834 break; 835 default: 836 raw_spin_lock_irqsave(&desc->lock, flags); 837 /* 838 * If this irq has an action, it is in use and 839 * must be migrated if it has affinity to this 840 * cpu. 841 */ 842 if (desc->action && cpumask_test_cpu(cpu, desc->affinity)) { 843 if (cpumask_weight(desc->affinity) > 1) { 844 /* 845 * It has multi CPU affinity, 846 * just remove this CPU from 847 * the affinity set. 848 */ 849 cpumask_copy(&new_affinity, desc->affinity); 850 cpumask_clear_cpu(cpu, &new_affinity); 851 } else { 852 /* 853 * Otherwise, put it on lowest 854 * numbered online CPU. 855 */ 856 cpumask_clear(&new_affinity); 857 cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity); 858 } 859 do_set_affinity = 1; 860 } else { 861 do_set_affinity = 0; 862 } 863 raw_spin_unlock_irqrestore(&desc->lock, flags); 864 865 if (do_set_affinity) 866 irq_set_affinity(irq, &new_affinity); 867 868 break; 869 } 870 } 871} 872 873#endif /* CONFIG_HOTPLUG_CPU */ 874