1 /* 2 * linux/arch/arm/common/gic.c 3 * 4 * Copyright (C) 2002 ARM Limited, All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Interrupt architecture for the GIC: 11 * 12 * o There is one Interrupt Distributor, which receives interrupts 13 * from system devices and sends them to the Interrupt Controllers. 14 * 15 * o There is one CPU Interface per CPU, which sends interrupts sent 16 * by the Distributor, and interrupts generated locally, to the 17 * associated CPU. The base address of the CPU interface is usually 18 * aliased so that the same address points to different chips depending 19 * on the CPU it is accessed from. 20 * 21 * Note that IRQs 0-31 are special - they are local to each CPU. 22 * As such, the enable set/clear, pending set/clear and active bit 23 * registers are banked per-cpu for these sources. 24 */ 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/err.h> 28 #include <linux/module.h> 29 #include <linux/list.h> 30 #include <linux/smp.h> 31 #include <linux/cpu.h> 32 #include <linux/cpu_pm.h> 33 #include <linux/cpumask.h> 34 #include <linux/io.h> 35 #include <linux/of.h> 36 #include <linux/of_address.h> 37 #include <linux/of_irq.h> 38 #include <linux/irqdomain.h> 39 #include <linux/interrupt.h> 40 #include <linux/percpu.h> 41 #include <linux/slab.h> 42 #include <linux/irqchip/chained_irq.h> 43 #include <linux/irqchip/arm-gic.h> 44 45 #include <asm/irq.h> 46 #include <asm/exception.h> 47 #include <asm/smp_plat.h> 48 49 #include "irqchip.h" 50 51 union gic_base { 52 void __iomem *common_base; 53 void __percpu __iomem **percpu_base; 54 }; 55 56 struct gic_chip_data { 57 union gic_base dist_base; 58 union gic_base cpu_base; 59 #ifdef CONFIG_CPU_PM 60 u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)]; 61 u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)]; 62 u32 saved_spi_target[DIV_ROUND_UP(1020, 4)]; 63 u32 __percpu *saved_ppi_enable; 64 u32 __percpu *saved_ppi_conf; 65 #endif 66 struct irq_domain *domain; 67 unsigned int gic_irqs; 68 #ifdef CONFIG_GIC_NON_BANKED 69 void __iomem *(*get_base)(union gic_base *); 70 #endif 71 }; 72 73 static DEFINE_RAW_SPINLOCK(irq_controller_lock); 74 75 /* 76 * The GIC mapping of CPU interfaces does not necessarily match 77 * the logical CPU numbering. Let's use a mapping as returned 78 * by the GIC itself. 79 */ 80 #define NR_GIC_CPU_IF 8 81 static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly; 82 83 /* 84 * Supported arch specific GIC irq extension. 85 * Default make them NULL. 86 */ 87 struct irq_chip gic_arch_extn = { 88 .irq_eoi = NULL, 89 .irq_mask = NULL, 90 .irq_unmask = NULL, 91 .irq_retrigger = NULL, 92 .irq_set_type = NULL, 93 .irq_set_wake = NULL, 94 }; 95 96 #ifndef MAX_GIC_NR 97 #define MAX_GIC_NR 1 98 #endif 99 100 static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly; 101 102 #ifdef CONFIG_GIC_NON_BANKED 103 static void __iomem *gic_get_percpu_base(union gic_base *base) 104 { 105 return *__this_cpu_ptr(base->percpu_base); 106 } 107 108 static void __iomem *gic_get_common_base(union gic_base *base) 109 { 110 return base->common_base; 111 } 112 113 static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data) 114 { 115 return data->get_base(&data->dist_base); 116 } 117 118 static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data) 119 { 120 return data->get_base(&data->cpu_base); 121 } 122 123 static inline void gic_set_base_accessor(struct gic_chip_data *data, 124 void __iomem *(*f)(union gic_base *)) 125 { 126 data->get_base = f; 127 } 128 #else 129 #define gic_data_dist_base(d) ((d)->dist_base.common_base) 130 #define gic_data_cpu_base(d) ((d)->cpu_base.common_base) 131 #define gic_set_base_accessor(d, f) 132 #endif 133 134 static inline void __iomem *gic_dist_base(struct irq_data *d) 135 { 136 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 137 return gic_data_dist_base(gic_data); 138 } 139 140 static inline void __iomem *gic_cpu_base(struct irq_data *d) 141 { 142 struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d); 143 return gic_data_cpu_base(gic_data); 144 } 145 146 static inline unsigned int gic_irq(struct irq_data *d) 147 { 148 return d->hwirq; 149 } 150 151 /* 152 * Routines to acknowledge, disable and enable interrupts 153 */ 154 static void gic_mask_irq(struct irq_data *d) 155 { 156 u32 mask = 1 << (gic_irq(d) % 32); 157 158 raw_spin_lock(&irq_controller_lock); 159 writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4); 160 if (gic_arch_extn.irq_mask) 161 gic_arch_extn.irq_mask(d); 162 raw_spin_unlock(&irq_controller_lock); 163 } 164 165 static void gic_unmask_irq(struct irq_data *d) 166 { 167 u32 mask = 1 << (gic_irq(d) % 32); 168 169 raw_spin_lock(&irq_controller_lock); 170 if (gic_arch_extn.irq_unmask) 171 gic_arch_extn.irq_unmask(d); 172 writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4); 173 raw_spin_unlock(&irq_controller_lock); 174 } 175 176 static void gic_eoi_irq(struct irq_data *d) 177 { 178 if (gic_arch_extn.irq_eoi) { 179 raw_spin_lock(&irq_controller_lock); 180 gic_arch_extn.irq_eoi(d); 181 raw_spin_unlock(&irq_controller_lock); 182 } 183 184 writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI); 185 } 186 187 static int gic_set_type(struct irq_data *d, unsigned int type) 188 { 189 void __iomem *base = gic_dist_base(d); 190 unsigned int gicirq = gic_irq(d); 191 u32 enablemask = 1 << (gicirq % 32); 192 u32 enableoff = (gicirq / 32) * 4; 193 u32 confmask = 0x2 << ((gicirq % 16) * 2); 194 u32 confoff = (gicirq / 16) * 4; 195 bool enabled = false; 196 u32 val; 197 198 /* Interrupt configuration for SGIs can't be changed */ 199 if (gicirq < 16) 200 return -EINVAL; 201 202 if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING) 203 return -EINVAL; 204 205 raw_spin_lock(&irq_controller_lock); 206 207 if (gic_arch_extn.irq_set_type) 208 gic_arch_extn.irq_set_type(d, type); 209 210 val = readl_relaxed(base + GIC_DIST_CONFIG + confoff); 211 if (type == IRQ_TYPE_LEVEL_HIGH) 212 val &= ~confmask; 213 else if (type == IRQ_TYPE_EDGE_RISING) 214 val |= confmask; 215 216 /* 217 * As recommended by the spec, disable the interrupt before changing 218 * the configuration 219 */ 220 if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) { 221 writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff); 222 enabled = true; 223 } 224 225 writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); 226 227 if (enabled) 228 writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff); 229 230 raw_spin_unlock(&irq_controller_lock); 231 232 return 0; 233 } 234 235 static int gic_retrigger(struct irq_data *d) 236 { 237 if (gic_arch_extn.irq_retrigger) 238 return gic_arch_extn.irq_retrigger(d); 239 240 /* the genirq layer expects 0 if we can't retrigger in hardware */ 241 return 0; 242 } 243 244 #ifdef CONFIG_SMP 245 static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, 246 bool force) 247 { 248 void __iomem *reg = gic_dist_base(d) + GIC_DIST_TARGET + (gic_irq(d) & ~3); 249 unsigned int shift = (gic_irq(d) % 4) * 8; 250 unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); 251 u32 val, mask, bit; 252 253 if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) 254 return -EINVAL; 255 256 mask = 0xff << shift; 257 bit = gic_cpu_map[cpu] << shift; 258 259 raw_spin_lock(&irq_controller_lock); 260 val = readl_relaxed(reg) & ~mask; 261 writel_relaxed(val | bit, reg); 262 raw_spin_unlock(&irq_controller_lock); 263 264 return IRQ_SET_MASK_OK; 265 } 266 #endif 267 268 #ifdef CONFIG_PM 269 static int gic_set_wake(struct irq_data *d, unsigned int on) 270 { 271 int ret = -ENXIO; 272 273 if (gic_arch_extn.irq_set_wake) 274 ret = gic_arch_extn.irq_set_wake(d, on); 275 276 return ret; 277 } 278 279 #else 280 #define gic_set_wake NULL 281 #endif 282 283 static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) 284 { 285 u32 irqstat, irqnr; 286 struct gic_chip_data *gic = &gic_data[0]; 287 void __iomem *cpu_base = gic_data_cpu_base(gic); 288 289 do { 290 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK); 291 irqnr = irqstat & ~0x1c00; 292 293 if (likely(irqnr > 15 && irqnr < 1021)) { 294 irqnr = irq_find_mapping(gic->domain, irqnr); 295 handle_IRQ(irqnr, regs); 296 continue; 297 } 298 if (irqnr < 16) { 299 writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); 300 #ifdef CONFIG_SMP 301 handle_IPI(irqnr, regs); 302 #endif 303 continue; 304 } 305 break; 306 } while (1); 307 } 308 309 static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) 310 { 311 struct gic_chip_data *chip_data = irq_get_handler_data(irq); 312 struct irq_chip *chip = irq_get_chip(irq); 313 unsigned int cascade_irq, gic_irq; 314 unsigned long status; 315 316 chained_irq_enter(chip, desc); 317 318 raw_spin_lock(&irq_controller_lock); 319 status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK); 320 raw_spin_unlock(&irq_controller_lock); 321 322 gic_irq = (status & 0x3ff); 323 if (gic_irq == 1023) 324 goto out; 325 326 cascade_irq = irq_find_mapping(chip_data->domain, gic_irq); 327 if (unlikely(gic_irq < 32 || gic_irq > 1020)) 328 handle_bad_irq(cascade_irq, desc); 329 else 330 generic_handle_irq(cascade_irq); 331 332 out: 333 chained_irq_exit(chip, desc); 334 } 335 336 static struct irq_chip gic_chip = { 337 .name = "GIC", 338 .irq_mask = gic_mask_irq, 339 .irq_unmask = gic_unmask_irq, 340 .irq_eoi = gic_eoi_irq, 341 .irq_set_type = gic_set_type, 342 .irq_retrigger = gic_retrigger, 343 #ifdef CONFIG_SMP 344 .irq_set_affinity = gic_set_affinity, 345 #endif 346 .irq_set_wake = gic_set_wake, 347 }; 348 349 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq) 350 { 351 if (gic_nr >= MAX_GIC_NR) 352 BUG(); 353 if (irq_set_handler_data(irq, &gic_data[gic_nr]) != 0) 354 BUG(); 355 irq_set_chained_handler(irq, gic_handle_cascade_irq); 356 } 357 358 static u8 gic_get_cpumask(struct gic_chip_data *gic) 359 { 360 void __iomem *base = gic_data_dist_base(gic); 361 u32 mask, i; 362 363 for (i = mask = 0; i < 32; i += 4) { 364 mask = readl_relaxed(base + GIC_DIST_TARGET + i); 365 mask |= mask >> 16; 366 mask |= mask >> 8; 367 if (mask) 368 break; 369 } 370 371 if (!mask) 372 pr_crit("GIC CPU mask not found - kernel will fail to boot.\n"); 373 374 return mask; 375 } 376 377 static void __init gic_dist_init(struct gic_chip_data *gic) 378 { 379 unsigned int i; 380 u32 cpumask; 381 unsigned int gic_irqs = gic->gic_irqs; 382 void __iomem *base = gic_data_dist_base(gic); 383 384 writel_relaxed(0, base + GIC_DIST_CTRL); 385 386 /* 387 * Set all global interrupts to be level triggered, active low. 388 */ 389 for (i = 32; i < gic_irqs; i += 16) 390 writel_relaxed(0, base + GIC_DIST_CONFIG + i * 4 / 16); 391 392 /* 393 * Set all global interrupts to this CPU only. 394 */ 395 cpumask = gic_get_cpumask(gic); 396 cpumask |= cpumask << 8; 397 cpumask |= cpumask << 16; 398 for (i = 32; i < gic_irqs; i += 4) 399 writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); 400 401 /* 402 * Set priority on all global interrupts. 403 */ 404 for (i = 32; i < gic_irqs; i += 4) 405 writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4); 406 407 /* 408 * Disable all interrupts. Leave the PPI and SGIs alone 409 * as these enables are banked registers. 410 */ 411 for (i = 32; i < gic_irqs; i += 32) 412 writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32); 413 414 writel_relaxed(1, base + GIC_DIST_CTRL); 415 } 416 417 static void gic_cpu_init(struct gic_chip_data *gic) 418 { 419 void __iomem *dist_base = gic_data_dist_base(gic); 420 void __iomem *base = gic_data_cpu_base(gic); 421 unsigned int cpu_mask, cpu = smp_processor_id(); 422 int i; 423 424 /* 425 * Get what the GIC says our CPU mask is. 426 */ 427 BUG_ON(cpu >= NR_GIC_CPU_IF); 428 cpu_mask = gic_get_cpumask(gic); 429 gic_cpu_map[cpu] = cpu_mask; 430 431 /* 432 * Clear our mask from the other map entries in case they're 433 * still undefined. 434 */ 435 for (i = 0; i < NR_GIC_CPU_IF; i++) 436 if (i != cpu) 437 gic_cpu_map[i] &= ~cpu_mask; 438 439 /* 440 * Deal with the banked PPI and SGI interrupts - disable all 441 * PPI interrupts, ensure all SGI interrupts are enabled. 442 */ 443 writel_relaxed(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR); 444 writel_relaxed(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET); 445 446 /* 447 * Set priority on PPI and SGI interrupts 448 */ 449 for (i = 0; i < 32; i += 4) 450 writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4); 451 452 writel_relaxed(0xf0, base + GIC_CPU_PRIMASK); 453 writel_relaxed(1, base + GIC_CPU_CTRL); 454 } 455 456 void gic_cpu_if_down(void) 457 { 458 void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]); 459 writel_relaxed(0, cpu_base + GIC_CPU_CTRL); 460 } 461 462 #ifdef CONFIG_CPU_PM 463 /* 464 * Saves the GIC distributor registers during suspend or idle. Must be called 465 * with interrupts disabled but before powering down the GIC. After calling 466 * this function, no interrupts will be delivered by the GIC, and another 467 * platform-specific wakeup source must be enabled. 468 */ 469 static void gic_dist_save(unsigned int gic_nr) 470 { 471 unsigned int gic_irqs; 472 void __iomem *dist_base; 473 int i; 474 475 if (gic_nr >= MAX_GIC_NR) 476 BUG(); 477 478 gic_irqs = gic_data[gic_nr].gic_irqs; 479 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 480 481 if (!dist_base) 482 return; 483 484 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 485 gic_data[gic_nr].saved_spi_conf[i] = 486 readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 487 488 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 489 gic_data[gic_nr].saved_spi_target[i] = 490 readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4); 491 492 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 493 gic_data[gic_nr].saved_spi_enable[i] = 494 readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 495 } 496 497 /* 498 * Restores the GIC distributor registers during resume or when coming out of 499 * idle. Must be called before enabling interrupts. If a level interrupt 500 * that occured while the GIC was suspended is still present, it will be 501 * handled normally, but any edge interrupts that occured will not be seen by 502 * the GIC and need to be handled by the platform-specific wakeup source. 503 */ 504 static void gic_dist_restore(unsigned int gic_nr) 505 { 506 unsigned int gic_irqs; 507 unsigned int i; 508 void __iomem *dist_base; 509 510 if (gic_nr >= MAX_GIC_NR) 511 BUG(); 512 513 gic_irqs = gic_data[gic_nr].gic_irqs; 514 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 515 516 if (!dist_base) 517 return; 518 519 writel_relaxed(0, dist_base + GIC_DIST_CTRL); 520 521 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++) 522 writel_relaxed(gic_data[gic_nr].saved_spi_conf[i], 523 dist_base + GIC_DIST_CONFIG + i * 4); 524 525 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 526 writel_relaxed(0xa0a0a0a0, 527 dist_base + GIC_DIST_PRI + i * 4); 528 529 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++) 530 writel_relaxed(gic_data[gic_nr].saved_spi_target[i], 531 dist_base + GIC_DIST_TARGET + i * 4); 532 533 for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) 534 writel_relaxed(gic_data[gic_nr].saved_spi_enable[i], 535 dist_base + GIC_DIST_ENABLE_SET + i * 4); 536 537 writel_relaxed(1, dist_base + GIC_DIST_CTRL); 538 } 539 540 static void gic_cpu_save(unsigned int gic_nr) 541 { 542 int i; 543 u32 *ptr; 544 void __iomem *dist_base; 545 void __iomem *cpu_base; 546 547 if (gic_nr >= MAX_GIC_NR) 548 BUG(); 549 550 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 551 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); 552 553 if (!dist_base || !cpu_base) 554 return; 555 556 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable); 557 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 558 ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); 559 560 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf); 561 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 562 ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4); 563 564 } 565 566 static void gic_cpu_restore(unsigned int gic_nr) 567 { 568 int i; 569 u32 *ptr; 570 void __iomem *dist_base; 571 void __iomem *cpu_base; 572 573 if (gic_nr >= MAX_GIC_NR) 574 BUG(); 575 576 dist_base = gic_data_dist_base(&gic_data[gic_nr]); 577 cpu_base = gic_data_cpu_base(&gic_data[gic_nr]); 578 579 if (!dist_base || !cpu_base) 580 return; 581 582 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable); 583 for (i = 0; i < DIV_ROUND_UP(32, 32); i++) 584 writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4); 585 586 ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf); 587 for (i = 0; i < DIV_ROUND_UP(32, 16); i++) 588 writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4); 589 590 for (i = 0; i < DIV_ROUND_UP(32, 4); i++) 591 writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4); 592 593 writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK); 594 writel_relaxed(1, cpu_base + GIC_CPU_CTRL); 595 } 596 597 static int gic_notifier(struct notifier_block *self, unsigned long cmd, void *v) 598 { 599 int i; 600 601 for (i = 0; i < MAX_GIC_NR; i++) { 602 #ifdef CONFIG_GIC_NON_BANKED 603 /* Skip over unused GICs */ 604 if (!gic_data[i].get_base) 605 continue; 606 #endif 607 switch (cmd) { 608 case CPU_PM_ENTER: 609 gic_cpu_save(i); 610 break; 611 case CPU_PM_ENTER_FAILED: 612 case CPU_PM_EXIT: 613 gic_cpu_restore(i); 614 break; 615 case CPU_CLUSTER_PM_ENTER: 616 gic_dist_save(i); 617 break; 618 case CPU_CLUSTER_PM_ENTER_FAILED: 619 case CPU_CLUSTER_PM_EXIT: 620 gic_dist_restore(i); 621 break; 622 } 623 } 624 625 return NOTIFY_OK; 626 } 627 628 static struct notifier_block gic_notifier_block = { 629 .notifier_call = gic_notifier, 630 }; 631 632 static void __init gic_pm_init(struct gic_chip_data *gic) 633 { 634 gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4, 635 sizeof(u32)); 636 BUG_ON(!gic->saved_ppi_enable); 637 638 gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4, 639 sizeof(u32)); 640 BUG_ON(!gic->saved_ppi_conf); 641 642 if (gic == &gic_data[0]) 643 cpu_pm_register_notifier(&gic_notifier_block); 644 } 645 #else 646 static void __init gic_pm_init(struct gic_chip_data *gic) 647 { 648 } 649 #endif 650 651 #ifdef CONFIG_SMP 652 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq) 653 { 654 int cpu; 655 unsigned long map = 0; 656 657 /* Convert our logical CPU mask into a physical one. */ 658 for_each_cpu(cpu, mask) 659 map |= gic_cpu_map[cpu]; 660 661 /* 662 * Ensure that stores to Normal memory are visible to the 663 * other CPUs before issuing the IPI. 664 */ 665 dsb(); 666 667 /* this always happens on GIC0 */ 668 writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT); 669 } 670 #endif 671 672 static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq, 673 irq_hw_number_t hw) 674 { 675 if (hw < 32) { 676 irq_set_percpu_devid(irq); 677 irq_set_chip_and_handler(irq, &gic_chip, 678 handle_percpu_devid_irq); 679 set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN); 680 } else { 681 irq_set_chip_and_handler(irq, &gic_chip, 682 handle_fasteoi_irq); 683 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 684 } 685 irq_set_chip_data(irq, d->host_data); 686 return 0; 687 } 688 689 static int gic_irq_domain_xlate(struct irq_domain *d, 690 struct device_node *controller, 691 const u32 *intspec, unsigned int intsize, 692 unsigned long *out_hwirq, unsigned int *out_type) 693 { 694 if (d->of_node != controller) 695 return -EINVAL; 696 if (intsize < 3) 697 return -EINVAL; 698 699 /* Get the interrupt number and add 16 to skip over SGIs */ 700 *out_hwirq = intspec[1] + 16; 701 702 /* For SPIs, we need to add 16 more to get the GIC irq ID number */ 703 if (!intspec[0]) 704 *out_hwirq += 16; 705 706 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; 707 return 0; 708 } 709 710 #ifdef CONFIG_SMP 711 static int gic_secondary_init(struct notifier_block *nfb, unsigned long action, 712 void *hcpu) 713 { 714 if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) 715 gic_cpu_init(&gic_data[0]); 716 return NOTIFY_OK; 717 } 718 719 /* 720 * Notifier for enabling the GIC CPU interface. Set an arbitrarily high 721 * priority because the GIC needs to be up before the ARM generic timers. 722 */ 723 static struct notifier_block gic_cpu_notifier = { 724 .notifier_call = gic_secondary_init, 725 .priority = 100, 726 }; 727 #endif 728 729 const struct irq_domain_ops gic_irq_domain_ops = { 730 .map = gic_irq_domain_map, 731 .xlate = gic_irq_domain_xlate, 732 }; 733 734 void __init gic_init_bases(unsigned int gic_nr, int irq_start, 735 void __iomem *dist_base, void __iomem *cpu_base, 736 u32 percpu_offset, struct device_node *node) 737 { 738 irq_hw_number_t hwirq_base; 739 struct gic_chip_data *gic; 740 int gic_irqs, irq_base, i; 741 742 BUG_ON(gic_nr >= MAX_GIC_NR); 743 744 gic = &gic_data[gic_nr]; 745 #ifdef CONFIG_GIC_NON_BANKED 746 if (percpu_offset) { /* Frankein-GIC without banked registers... */ 747 unsigned int cpu; 748 749 gic->dist_base.percpu_base = alloc_percpu(void __iomem *); 750 gic->cpu_base.percpu_base = alloc_percpu(void __iomem *); 751 if (WARN_ON(!gic->dist_base.percpu_base || 752 !gic->cpu_base.percpu_base)) { 753 free_percpu(gic->dist_base.percpu_base); 754 free_percpu(gic->cpu_base.percpu_base); 755 return; 756 } 757 758 for_each_possible_cpu(cpu) { 759 unsigned long offset = percpu_offset * cpu_logical_map(cpu); 760 *per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset; 761 *per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset; 762 } 763 764 gic_set_base_accessor(gic, gic_get_percpu_base); 765 } else 766 #endif 767 { /* Normal, sane GIC... */ 768 WARN(percpu_offset, 769 "GIC_NON_BANKED not enabled, ignoring %08x offset!", 770 percpu_offset); 771 gic->dist_base.common_base = dist_base; 772 gic->cpu_base.common_base = cpu_base; 773 gic_set_base_accessor(gic, gic_get_common_base); 774 } 775 776 /* 777 * Initialize the CPU interface map to all CPUs. 778 * It will be refined as each CPU probes its ID. 779 */ 780 for (i = 0; i < NR_GIC_CPU_IF; i++) 781 gic_cpu_map[i] = 0xff; 782 783 /* 784 * For primary GICs, skip over SGIs. 785 * For secondary GICs, skip over PPIs, too. 786 */ 787 if (gic_nr == 0 && (irq_start & 31) > 0) { 788 hwirq_base = 16; 789 if (irq_start != -1) 790 irq_start = (irq_start & ~31) + 16; 791 } else { 792 hwirq_base = 32; 793 } 794 795 /* 796 * Find out how many interrupts are supported. 797 * The GIC only supports up to 1020 interrupt sources. 798 */ 799 gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f; 800 gic_irqs = (gic_irqs + 1) * 32; 801 if (gic_irqs > 1020) 802 gic_irqs = 1020; 803 gic->gic_irqs = gic_irqs; 804 805 gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */ 806 irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, numa_node_id()); 807 if (IS_ERR_VALUE(irq_base)) { 808 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", 809 irq_start); 810 irq_base = irq_start; 811 } 812 gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base, 813 hwirq_base, &gic_irq_domain_ops, gic); 814 if (WARN_ON(!gic->domain)) 815 return; 816 817 #ifdef CONFIG_SMP 818 set_smp_cross_call(gic_raise_softirq); 819 register_cpu_notifier(&gic_cpu_notifier); 820 #endif 821 822 set_handle_irq(gic_handle_irq); 823 824 gic_chip.flags |= gic_arch_extn.flags; 825 gic_dist_init(gic); 826 gic_cpu_init(gic); 827 gic_pm_init(gic); 828 } 829 830 #ifdef CONFIG_OF 831 static int gic_cnt __initdata; 832 833 int __init gic_of_init(struct device_node *node, struct device_node *parent) 834 { 835 void __iomem *cpu_base; 836 void __iomem *dist_base; 837 u32 percpu_offset; 838 int irq; 839 840 if (WARN_ON(!node)) 841 return -ENODEV; 842 843 dist_base = of_iomap(node, 0); 844 WARN(!dist_base, "unable to map gic dist registers\n"); 845 846 cpu_base = of_iomap(node, 1); 847 WARN(!cpu_base, "unable to map gic cpu registers\n"); 848 849 if (of_property_read_u32(node, "cpu-offset", &percpu_offset)) 850 percpu_offset = 0; 851 852 gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node); 853 854 if (parent) { 855 irq = irq_of_parse_and_map(node, 0); 856 gic_cascade_irq(gic_cnt, irq); 857 } 858 gic_cnt++; 859 return 0; 860 } 861 IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init); 862 IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init); 863 IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init); 864 IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init); 865 866 #endif 867