linux/drivers/irqchip/irq-gic.c
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   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
  51union gic_base {
  52        void __iomem *common_base;
  53        void __percpu __iomem **percpu_base;
  54};
  55
  56struct 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
  73static 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
  81static 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 */
  87struct 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
 100static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
 101
 102#ifdef CONFIG_GIC_NON_BANKED
 103static void __iomem *gic_get_percpu_base(union gic_base *base)
 104{
 105        return *__this_cpu_ptr(base->percpu_base);
 106}
 107
 108static void __iomem *gic_get_common_base(union gic_base *base)
 109{
 110        return base->common_base;
 111}
 112
 113static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
 114{
 115        return data->get_base(&data->dist_base);
 116}
 117
 118static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
 119{
 120        return data->get_base(&data->cpu_base);
 121}
 122
 123static 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
 134static 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
 140static 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
 146static 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 */
 154static 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
 165static 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
 176static 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
 187static 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
 235static 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
 245static 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
 269static 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
 283static 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
 309static 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
 336static 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
 349void __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
 358static 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
 377static 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
 417static 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
 456void 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 */
 469static 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 */
 504static 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
 540static 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
 566static 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
 597static 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
 628static struct notifier_block gic_notifier_block = {
 629        .notifier_call = gic_notifier,
 630};
 631
 632static 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
 646static void __init gic_pm_init(struct gic_chip_data *gic)
 647{
 648}
 649#endif
 650
 651#ifdef CONFIG_SMP
 652void 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
 672static 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
 689static 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
 711static 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 */
 723static struct notifier_block gic_cpu_notifier = {
 724        .notifier_call = gic_secondary_init,
 725        .priority = 100,
 726};
 727#endif
 728
 729const struct irq_domain_ops gic_irq_domain_ops = {
 730        .map = gic_irq_domain_map,
 731        .xlate = gic_irq_domain_xlate,
 732};
 733
 734void __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
 831static int gic_cnt __initdata;
 832
 833int __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}
 861IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
 862IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
 863IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
 864IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
 865
 866#endif
 867
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