drivers/irqchip/irq-armada-370-xp.c

   1 /*
   2  * Marvell Armada 370 and Armada XP SoC IRQ handling
   3  *
   4  * Copyright (C) 2012 Marvell
   5  *
   6  * Lior Amsalem <alior@marvell.com>
   7  * Gregory CLEMENT <gregory.clement@free-electrons.com>
   8  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   9  * Ben Dooks <ben.dooks@codethink.co.uk>
  10  *
  11  * This file is licensed under the terms of the GNU General Public
  12  * License version 2.  This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/irq.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irqchip.h>
  22 #include <linux/irqchip/chained_irq.h>
  23 #include <linux/cpu.h>
  24 #include <linux/io.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_pci.h>
  28 #include <linux/irqdomain.h>
  29 #include <linux/slab.h>
  30 #include <linux/syscore_ops.h>
  31 #include <linux/msi.h>
  32 #include <asm/mach/arch.h>
  33 #include <asm/exception.h>
  34 #include <asm/smp_plat.h>
  35 #include <asm/mach/irq.h>
  36
  37 /*
  38  * Overall diagram of the Armada XP interrupt controller:
  39  *
  40  *    To CPU 0                 To CPU 1
  41  *
  42  *       /\                       /\
  43  *       ||                       ||
  44  * +---------------+     +---------------+
  45  * |               |     |               |
  46  * |    per-CPU    |     |    per-CPU    |
  47  * |  mask/unmask  |     |  mask/unmask  |
  48  * |     CPU0      |     |     CPU1      |
  49  * |               |     |               |
  50  * +---------------+     +---------------+
  51  *        /\                       /\
  52  *        ||                       ||
  53  *        \\_______________________//
  54  *                     ||
  55  *            +-------------------+
  56  *            |                   |
  57  *            | Global interrupt  |
  58  *            |    mask/unmask    |
  59  *            |                   |
  60  *            +-------------------+
  61  *                     /\
  62  *                     ||
  63  *               interrupt from
  64  *                   device
  65  *
  66  * The "global interrupt mask/unmask" is modified using the
  67  * ARMADA_370_XP_INT_SET_ENABLE_OFFS and
  68  * ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS registers, which are relative
  69  * to "main_int_base".
  70  *
  71  * The "per-CPU mask/unmask" is modified using the
  72  * ARMADA_370_XP_INT_SET_MASK_OFFS and
  73  * ARMADA_370_XP_INT_CLEAR_MASK_OFFS registers, which are relative to
  74  * "per_cpu_int_base". This base address points to a special address,
  75  * which automatically accesses the registers of the current CPU.
  76  *
  77  * The per-CPU mask/unmask can also be adjusted using the global
  78  * per-interrupt ARMADA_370_XP_INT_SOURCE_CTL register, which we use
  79  * to configure interrupt affinity.
  80  *
  81  * Due to this model, all interrupts need to be mask/unmasked at two
  82  * different levels: at the global level and at the per-CPU level.
  83  *
  84  * This driver takes the following approach to deal with this:
  85  *
  86  *  - For global interrupts:
  87  *
  88  *    At ->map() time, a global interrupt is unmasked at the per-CPU
  89  *    mask/unmask level. It is therefore unmasked at this level for
  90  *    the current CPU, running the ->map() code. This allows to have
  91  *    the interrupt unmasked at this level in non-SMP
  92  *    configurations. In SMP configurations, the ->set_affinity()
  93  *    callback is called, which using the
  94  *    ARMADA_370_XP_INT_SOURCE_CTL() readjusts the per-CPU mask/unmask
  95  *    for the interrupt.
  96  *
  97  *    The ->mask() and ->unmask() operations only mask/unmask the
  98  *    interrupt at the "global" level.
  99  *
 100  *    So, a global interrupt is enabled at the per-CPU level as soon
 101  *    as it is mapped. At run time, the masking/unmasking takes place
 102  *    at the global level.
 103  *
 104  *  - For per-CPU interrupts
 105  *
 106  *    At ->map() time, a per-CPU interrupt is unmasked at the global
 107  *    mask/unmask level.
 108  *
 109  *    The ->mask() and ->unmask() operations mask/unmask the interrupt
 110  *    at the per-CPU level.
 111  *
 112  *    So, a per-CPU interrupt is enabled at the global level as soon
 113  *    as it is mapped. At run time, the masking/unmasking takes place
 114  *    at the per-CPU level.
 115  */
 116
 117 /* Registers relative to main_int_base */
 118 #define ARMADA_370_XP_INT_CONTROL               (0x00)
 119 #define ARMADA_370_XP_SW_TRIG_INT_OFFS          (0x04)
 120 #define ARMADA_370_XP_INT_SET_ENABLE_OFFS       (0x30)
 121 #define ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS     (0x34)
 122 #define ARMADA_370_XP_INT_SOURCE_CTL(irq)       (0x100 + irq*4)
 123 #define ARMADA_370_XP_INT_SOURCE_CPU_MASK       0xF
 124 #define ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)   ((BIT(0) | BIT(8)) << cpuid)
 125
 126 /* Registers relative to per_cpu_int_base */
 127 #define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS       (0x08)
 128 #define ARMADA_370_XP_IN_DRBEL_MSK_OFFS         (0x0c)
 129 #define ARMADA_375_PPI_CAUSE                    (0x10)
 130 #define ARMADA_370_XP_CPU_INTACK_OFFS           (0x44)
 131 #define ARMADA_370_XP_INT_SET_MASK_OFFS         (0x48)
 132 #define ARMADA_370_XP_INT_CLEAR_MASK_OFFS       (0x4C)
 133 #define ARMADA_370_XP_INT_FABRIC_MASK_OFFS      (0x54)
 134 #define ARMADA_370_XP_INT_CAUSE_PERF(cpu)       (1 << cpu)
 135
 136 #define ARMADA_370_XP_MAX_PER_CPU_IRQS          (28)
 137
 138 #define IPI_DOORBELL_START                      (0)
 139 #define IPI_DOORBELL_END                        (8)
 140 #define IPI_DOORBELL_MASK                       0xFF
 141 #define PCI_MSI_DOORBELL_START                  (16)
 142 #define PCI_MSI_DOORBELL_NR                     (16)
 143 #define PCI_MSI_DOORBELL_END                    (32)
 144 #define PCI_MSI_DOORBELL_MASK                   0xFFFF0000
 145
 146 static void __iomem *per_cpu_int_base;
 147 static void __iomem *main_int_base;
 148 static struct irq_domain *armada_370_xp_mpic_domain;
 149 static u32 doorbell_mask_reg;
 150 static int parent_irq;
 151 #ifdef CONFIG_PCI_MSI
 152 static struct irq_domain *armada_370_xp_msi_domain;
 153 static struct irq_domain *armada_370_xp_msi_inner_domain;
 154 static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
 155 static DEFINE_MUTEX(msi_used_lock);
 156 static phys_addr_t msi_doorbell_addr;
 157 #endif
 158
 159 static inline bool is_percpu_irq(irq_hw_number_t irq)
 160 {
 161         if (irq <= ARMADA_370_XP_MAX_PER_CPU_IRQS)
 162                 return true;
 163
 164         return false;
 165 }
 166
 167 /*
 168  * In SMP mode:
 169  * For shared global interrupts, mask/unmask global enable bit
 170  * For CPU interrupts, mask/unmask the calling CPU's bit
 171  */
 172 static void armada_370_xp_irq_mask(struct irq_data *d)
 173 {
 174         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 175
 176         if (!is_percpu_irq(hwirq))
 177                 writel(hwirq, main_int_base +
 178                                 ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
 179         else
 180                 writel(hwirq, per_cpu_int_base +
 181                                 ARMADA_370_XP_INT_SET_MASK_OFFS);
 182 }
 183
 184 static void armada_370_xp_irq_unmask(struct irq_data *d)
 185 {
 186         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 187
 188         if (!is_percpu_irq(hwirq))
 189                 writel(hwirq, main_int_base +
 190                                 ARMADA_370_XP_INT_SET_ENABLE_OFFS);
 191         else
 192                 writel(hwirq, per_cpu_int_base +
 193                                 ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 194 }
 195
 196 #ifdef CONFIG_PCI_MSI
 197
 198 static struct irq_chip armada_370_xp_msi_irq_chip = {
 199         .name = "MPIC MSI",
 200         .irq_mask = pci_msi_mask_irq,
 201         .irq_unmask = pci_msi_unmask_irq,
 202 };
 203
 204 static struct msi_domain_info armada_370_xp_msi_domain_info = {
 205         .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 206                    MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
 207         .chip   = &armada_370_xp_msi_irq_chip,
 208 };
 209
 210 static void armada_370_xp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 211 {
 212         msg->address_lo = lower_32_bits(msi_doorbell_addr);
 213         msg->address_hi = upper_32_bits(msi_doorbell_addr);
 214         msg->data = 0xf00 | (data->hwirq + PCI_MSI_DOORBELL_START);
 215 }
 216
 217 static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data,
 218                                           const struct cpumask *mask, bool force)
 219 {
 220          return -EINVAL;
 221 }
 222
 223 static struct irq_chip armada_370_xp_msi_bottom_irq_chip = {
 224         .name                   = "MPIC MSI",
 225         .irq_compose_msi_msg    = armada_370_xp_compose_msi_msg,
 226         .irq_set_affinity       = armada_370_xp_msi_set_affinity,
 227 };
 228
 229 static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq,
 230                                    unsigned int nr_irqs, void *args)
 231 {
 232         int hwirq, i;
 233
 234         mutex_lock(&msi_used_lock);
 235
 236         hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR,
 237                                            0, nr_irqs, 0);
 238         if (hwirq >= PCI_MSI_DOORBELL_NR) {
 239                 mutex_unlock(&msi_used_lock);
 240                 return -ENOSPC;
 241         }
 242
 243         bitmap_set(msi_used, hwirq, nr_irqs);
 244         mutex_unlock(&msi_used_lock);
 245
 246         for (i = 0; i < nr_irqs; i++) {
 247                 irq_domain_set_info(domain, virq + i, hwirq + i,
 248                                     &armada_370_xp_msi_bottom_irq_chip,
 249                                     domain->host_data, handle_simple_irq,
 250                                     NULL, NULL);
 251         }
 252
 253         return hwirq;
 254 }
 255
 256 static void armada_370_xp_msi_free(struct irq_domain *domain,
 257                                    unsigned int virq, unsigned int nr_irqs)
 258 {
 259         struct irq_data *d = irq_domain_get_irq_data(domain, virq);
 260
 261         mutex_lock(&msi_used_lock);
 262         bitmap_clear(msi_used, d->hwirq, nr_irqs);
 263         mutex_unlock(&msi_used_lock);
 264 }
 265
 266 static const struct irq_domain_ops armada_370_xp_msi_domain_ops = {
 267         .alloc  = armada_370_xp_msi_alloc,
 268         .free   = armada_370_xp_msi_free,
 269 };
 270
 271 static int armada_370_xp_msi_init(struct device_node *node,
 272                                   phys_addr_t main_int_phys_base)
 273 {
 274         u32 reg;
 275
 276         msi_doorbell_addr = main_int_phys_base +
 277                 ARMADA_370_XP_SW_TRIG_INT_OFFS;
 278
 279         armada_370_xp_msi_inner_domain =
 280                 irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR,
 281                                       &armada_370_xp_msi_domain_ops, NULL);
 282         if (!armada_370_xp_msi_inner_domain)
 283                 return -ENOMEM;
 284
 285         armada_370_xp_msi_domain =
 286                 pci_msi_create_irq_domain(of_node_to_fwnode(node),
 287                                           &armada_370_xp_msi_domain_info,
 288                                           armada_370_xp_msi_inner_domain);
 289         if (!armada_370_xp_msi_domain) {
 290                 irq_domain_remove(armada_370_xp_msi_inner_domain);
 291                 return -ENOMEM;
 292         }
 293
 294         reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS)
 295                 | PCI_MSI_DOORBELL_MASK;
 296
 297         writel(reg, per_cpu_int_base +
 298                ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 299
 300         /* Unmask IPI interrupt */
 301         writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 302
 303         return 0;
 304 }
 305 #else
 306 static inline int armada_370_xp_msi_init(struct device_node *node,
 307                                          phys_addr_t main_int_phys_base)
 308 {
 309         return 0;
 310 }
 311 #endif
 312
 313 static void armada_xp_mpic_perf_init(void)
 314 {
 315         unsigned long cpuid = cpu_logical_map(smp_processor_id());
 316
 317         /* Enable Performance Counter Overflow interrupts */
 318         writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid),
 319                per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS);
 320 }
 321
 322 #ifdef CONFIG_SMP
 323 static struct irq_domain *ipi_domain;
 324
 325 static void armada_370_xp_ipi_mask(struct irq_data *d)
 326 {
 327         u32 reg;
 328         reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 329         reg &= ~BIT(d->hwirq);
 330         writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 331 }
 332
 333 static void armada_370_xp_ipi_unmask(struct irq_data *d)
 334 {
 335         u32 reg;
 336         reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 337         reg |= BIT(d->hwirq);
 338         writel(reg, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 339 }
 340
 341 static void armada_370_xp_ipi_send_mask(struct irq_data *d,
 342                                         const struct cpumask *mask)
 343 {
 344         unsigned long map = 0;
 345         int cpu;
 346
 347         /* Convert our logical CPU mask into a physical one. */
 348         for_each_cpu(cpu, mask)
 349                 map |= 1 << cpu_logical_map(cpu);
 350
 351         /*
 352          * Ensure that stores to Normal memory are visible to the
 353          * other CPUs before issuing the IPI.
 354          */
 355         dsb();
 356
 357         /* submit softirq */
 358         writel((map << 8) | d->hwirq, main_int_base +
 359                 ARMADA_370_XP_SW_TRIG_INT_OFFS);
 360 }
 361
 362 static void armada_370_xp_ipi_eoi(struct irq_data *d)
 363 {
 364         writel(~BIT(d->hwirq), per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
 365 }
 366
 367 static struct irq_chip ipi_irqchip = {
 368         .name           = "IPI",
 369         .irq_mask       = armada_370_xp_ipi_mask,
 370         .irq_unmask     = armada_370_xp_ipi_unmask,
 371         .irq_eoi        = armada_370_xp_ipi_eoi,
 372         .ipi_send_mask  = armada_370_xp_ipi_send_mask,
 373 };
 374
 375 static int armada_370_xp_ipi_alloc(struct irq_domain *d,
 376                                          unsigned int virq,
 377                                          unsigned int nr_irqs, void *args)
 378 {
 379         int i;
 380
 381         for (i = 0; i < nr_irqs; i++) {
 382                 irq_set_percpu_devid(virq + i);
 383                 irq_domain_set_info(d, virq + i, i, &ipi_irqchip,
 384                                     d->host_data,
 385                                     handle_percpu_devid_irq,
 386                                     NULL, NULL);
 387         }
 388
 389         return 0;
 390 }
 391
 392 static void armada_370_xp_ipi_free(struct irq_domain *d,
 393                                          unsigned int virq,
 394                                          unsigned int nr_irqs)
 395 {
 396         /* Not freeing IPIs */
 397 }
 398
 399 static const struct irq_domain_ops ipi_domain_ops = {
 400         .alloc  = armada_370_xp_ipi_alloc,
 401         .free   = armada_370_xp_ipi_free,
 402 };
 403
 404 static void ipi_resume(void)
 405 {
 406         int i;
 407
 408         for (i = 0; i < IPI_DOORBELL_END; i++) {
 409                 int irq;
 410
 411                 irq = irq_find_mapping(ipi_domain, i);
 412                 if (irq <= 0)
 413                         continue;
 414                 if (irq_percpu_is_enabled(irq)) {
 415                         struct irq_data *d;
 416                         d = irq_domain_get_irq_data(ipi_domain, irq);
 417                         armada_370_xp_ipi_unmask(d);
 418                 }
 419         }
 420 }
 421
 422 static __init void armada_xp_ipi_init(struct device_node *node)
 423 {
 424         int base_ipi;
 425
 426         ipi_domain = irq_domain_create_linear(of_node_to_fwnode(node),
 427                                               IPI_DOORBELL_END,
 428                                               &ipi_domain_ops, NULL);
 429         if (WARN_ON(!ipi_domain))
 430                 return;
 431
 432         irq_domain_update_bus_token(ipi_domain, DOMAIN_BUS_IPI);
 433         base_ipi = __irq_domain_alloc_irqs(ipi_domain, -1, IPI_DOORBELL_END,
 434                                            NUMA_NO_NODE, NULL, false, NULL);
 435         if (WARN_ON(!base_ipi))
 436                 return;
 437
 438         set_smp_ipi_range(base_ipi, IPI_DOORBELL_END);
 439 }
 440
 441 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
 442
 443 static int armada_xp_set_affinity(struct irq_data *d,
 444                                   const struct cpumask *mask_val, bool force)
 445 {
 446         irq_hw_number_t hwirq = irqd_to_hwirq(d);
 447         unsigned long reg, mask;
 448         int cpu;
 449
 450         /* Select a single core from the affinity mask which is online */
 451         cpu = cpumask_any_and(mask_val, cpu_online_mask);
 452         mask = 1UL << cpu_logical_map(cpu);
 453
 454         raw_spin_lock(&irq_controller_lock);
 455         reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
 456         reg = (reg & (~ARMADA_370_XP_INT_SOURCE_CPU_MASK)) | mask;
 457         writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
 458         raw_spin_unlock(&irq_controller_lock);
 459
 460         irq_data_update_effective_affinity(d, cpumask_of(cpu));
 461
 462         return IRQ_SET_MASK_OK;
 463 }
 464
 465 static void armada_xp_mpic_smp_cpu_init(void)
 466 {
 467         u32 control;
 468         int nr_irqs, i;
 469
 470         control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
 471         nr_irqs = (control >> 2) & 0x3ff;
 472
 473         for (i = 0; i < nr_irqs; i++)
 474                 writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);
 475
 476         /* Disable all IPIs */
 477         writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 478
 479         /* Clear pending IPIs */
 480         writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
 481
 482         /* Unmask IPI interrupt */
 483         writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 484 }
 485
 486 static void armada_xp_mpic_reenable_percpu(void)
 487 {
 488         unsigned int irq;
 489
 490         /* Re-enable per-CPU interrupts that were enabled before suspend */
 491         for (irq = 0; irq < ARMADA_370_XP_MAX_PER_CPU_IRQS; irq++) {
 492                 struct irq_data *data;
 493                 int virq;
 494
 495                 virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
 496                 if (virq == 0)
 497                         continue;
 498
 499                 data = irq_get_irq_data(virq);
 500
 501                 if (!irq_percpu_is_enabled(virq))
 502                         continue;
 503
 504                 armada_370_xp_irq_unmask(data);
 505         }
 506
 507         ipi_resume();
 508 }
 509
 510 static int armada_xp_mpic_starting_cpu(unsigned int cpu)
 511 {
 512         armada_xp_mpic_perf_init();
 513         armada_xp_mpic_smp_cpu_init();
 514         armada_xp_mpic_reenable_percpu();
 515         return 0;
 516 }
 517
 518 static int mpic_cascaded_starting_cpu(unsigned int cpu)
 519 {
 520         armada_xp_mpic_perf_init();
 521         armada_xp_mpic_reenable_percpu();
 522         enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
 523         return 0;
 524 }
 525 #else
 526 static void armada_xp_mpic_smp_cpu_init(void) {}
 527 static void ipi_resume(void) {}
 528 #endif
 529
 530 static struct irq_chip armada_370_xp_irq_chip = {
 531         .name           = "MPIC",
 532         .irq_mask       = armada_370_xp_irq_mask,
 533         .irq_mask_ack   = armada_370_xp_irq_mask,
 534         .irq_unmask     = armada_370_xp_irq_unmask,
 535 #ifdef CONFIG_SMP
 536         .irq_set_affinity = armada_xp_set_affinity,
 537 #endif
 538         .flags          = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
 539 };
 540
 541 static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
 542                                       unsigned int virq, irq_hw_number_t hw)
 543 {
 544         armada_370_xp_irq_mask(irq_get_irq_data(virq));
 545         if (!is_percpu_irq(hw))
 546                 writel(hw, per_cpu_int_base +
 547                         ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 548         else
 549                 writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS);
 550         irq_set_status_flags(virq, IRQ_LEVEL);
 551
 552         if (is_percpu_irq(hw)) {
 553                 irq_set_percpu_devid(virq);
 554                 irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
 555                                         handle_percpu_devid_irq);
 556         } else {
 557                 irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
 558                                         handle_level_irq);
 559                 irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
 560         }
 561         irq_set_probe(virq);
 562
 563         return 0;
 564 }
 565
 566 static const struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
 567         .map = armada_370_xp_mpic_irq_map,
 568         .xlate = irq_domain_xlate_onecell,
 569 };
 570
 571 #ifdef CONFIG_PCI_MSI
 572 static void armada_370_xp_handle_msi_irq(struct pt_regs *regs, bool is_chained)
 573 {
 574         u32 msimask, msinr;
 575
 576         msimask = readl_relaxed(per_cpu_int_base +
 577                                 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
 578                 & PCI_MSI_DOORBELL_MASK;
 579
 580         writel(~msimask, per_cpu_int_base +
 581                ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
 582
 583         for (msinr = PCI_MSI_DOORBELL_START;
 584              msinr < PCI_MSI_DOORBELL_END; msinr++) {
 585                 unsigned int irq;
 586
 587                 if (!(msimask & BIT(msinr)))
 588                         continue;
 589
 590                 irq = msinr - PCI_MSI_DOORBELL_START;
 591
 592                 if (is_chained)
 593                         generic_handle_domain_irq(armada_370_xp_msi_inner_domain,
 594                                                   irq);
 595                 else
 596                         handle_domain_irq(armada_370_xp_msi_inner_domain,
 597                                           irq, regs);
 598         }
 599 }
 600 #else
 601 static void armada_370_xp_handle_msi_irq(struct pt_regs *r, bool b) {}
 602 #endif
 603
 604 static void armada_370_xp_mpic_handle_cascade_irq(struct irq_desc *desc)
 605 {
 606         struct irq_chip *chip = irq_desc_get_chip(desc);
 607         unsigned long irqmap, irqn, irqsrc, cpuid;
 608
 609         chained_irq_enter(chip, desc);
 610
 611         irqmap = readl_relaxed(per_cpu_int_base + ARMADA_375_PPI_CAUSE);
 612         cpuid = cpu_logical_map(smp_processor_id());
 613
 614         for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {
 615                 irqsrc = readl_relaxed(main_int_base +
 616                                        ARMADA_370_XP_INT_SOURCE_CTL(irqn));
 617
 618                 /* Check if the interrupt is not masked on current CPU.
 619                  * Test IRQ (0-1) and FIQ (8-9) mask bits.
 620                  */
 621                 if (!(irqsrc & ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)))
 622                         continue;
 623
 624                 if (irqn == 1) {
 625                         armada_370_xp_handle_msi_irq(NULL, true);
 626                         continue;
 627                 }
 628
 629                 generic_handle_domain_irq(armada_370_xp_mpic_domain, irqn);
 630         }
 631
 632         chained_irq_exit(chip, desc);
 633 }
 634
 635 static void __exception_irq_entry
 636 armada_370_xp_handle_irq(struct pt_regs *regs)
 637 {
 638         u32 irqstat, irqnr;
 639
 640         do {
 641                 irqstat = readl_relaxed(per_cpu_int_base +
 642                                         ARMADA_370_XP_CPU_INTACK_OFFS);
 643                 irqnr = irqstat & 0x3FF;
 644
 645                 if (irqnr > 1022)
 646                         break;
 647
 648                 if (irqnr > 1) {
 649                         handle_domain_irq(armada_370_xp_mpic_domain,
 650                                           irqnr, regs);
 651                         continue;
 652                 }
 653
 654                 /* MSI handling */
 655                 if (irqnr == 1)
 656                         armada_370_xp_handle_msi_irq(regs, false);
 657
 658 #ifdef CONFIG_SMP
 659                 /* IPI Handling */
 660                 if (irqnr == 0) {
 661                         unsigned long ipimask;
 662                         int ipi;
 663
 664                         ipimask = readl_relaxed(per_cpu_int_base +
 665                                                 ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
 666                                 & IPI_DOORBELL_MASK;
 667
 668                         for_each_set_bit(ipi, &ipimask, IPI_DOORBELL_END)
 669                                 handle_domain_irq(ipi_domain, ipi, regs);
 670                 }
 671 #endif
 672
 673         } while (1);
 674 }
 675
 676 static int armada_370_xp_mpic_suspend(void)
 677 {
 678         doorbell_mask_reg = readl(per_cpu_int_base +
 679                                   ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 680         return 0;
 681 }
 682
 683 static void armada_370_xp_mpic_resume(void)
 684 {
 685         int nirqs;
 686         irq_hw_number_t irq;
 687
 688         /* Re-enable interrupts */
 689         nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
 690         for (irq = 0; irq < nirqs; irq++) {
 691                 struct irq_data *data;
 692                 int virq;
 693
 694                 virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
 695                 if (virq == 0)
 696                         continue;
 697
 698                 data = irq_get_irq_data(virq);
 699
 700                 if (!is_percpu_irq(irq)) {
 701                         /* Non per-CPU interrupts */
 702                         writel(irq, per_cpu_int_base +
 703                                ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 704                         if (!irqd_irq_disabled(data))
 705                                 armada_370_xp_irq_unmask(data);
 706                 } else {
 707                         /* Per-CPU interrupts */
 708                         writel(irq, main_int_base +
 709                                ARMADA_370_XP_INT_SET_ENABLE_OFFS);
 710
 711                         /*
 712                          * Re-enable on the current CPU,
 713                          * armada_xp_mpic_reenable_percpu() will take
 714                          * care of secondary CPUs when they come up.
 715                          */
 716                         if (irq_percpu_is_enabled(virq))
 717                                 armada_370_xp_irq_unmask(data);
 718                 }
 719         }
 720
 721         /* Reconfigure doorbells for IPIs and MSIs */
 722         writel(doorbell_mask_reg,
 723                per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 724         if (doorbell_mask_reg & IPI_DOORBELL_MASK)
 725                 writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 726         if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
 727                 writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 728
 729         ipi_resume();
 730 }
 731
 732 static struct syscore_ops armada_370_xp_mpic_syscore_ops = {
 733         .suspend        = armada_370_xp_mpic_suspend,
 734         .resume         = armada_370_xp_mpic_resume,
 735 };
 736
 737 static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 738                                              struct device_node *parent)
 739 {
 740         struct resource main_int_res, per_cpu_int_res;
 741         int nr_irqs, i;
 742         u32 control;
 743
 744         BUG_ON(of_address_to_resource(node, 0, &main_int_res));
 745         BUG_ON(of_address_to_resource(node, 1, &per_cpu_int_res));
 746
 747         BUG_ON(!request_mem_region(main_int_res.start,
 748                                    resource_size(&main_int_res),
 749                                    node->full_name));
 750         BUG_ON(!request_mem_region(per_cpu_int_res.start,
 751                                    resource_size(&per_cpu_int_res),
 752                                    node->full_name));
 753
 754         main_int_base = ioremap(main_int_res.start,
 755                                 resource_size(&main_int_res));
 756         BUG_ON(!main_int_base);
 757
 758         per_cpu_int_base = ioremap(per_cpu_int_res.start,
 759                                    resource_size(&per_cpu_int_res));
 760         BUG_ON(!per_cpu_int_base);
 761
 762         control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
 763         nr_irqs = (control >> 2) & 0x3ff;
 764
 765         for (i = 0; i < nr_irqs; i++)
 766                 writel(i, main_int_base + ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
 767
 768         armada_370_xp_mpic_domain =
 769                 irq_domain_add_linear(node, nr_irqs,
 770                                 &armada_370_xp_mpic_irq_ops, NULL);
 771         BUG_ON(!armada_370_xp_mpic_domain);
 772         irq_domain_update_bus_token(armada_370_xp_mpic_domain, DOMAIN_BUS_WIRED);
 773
 774         /* Setup for the boot CPU */
 775         armada_xp_mpic_perf_init();
 776         armada_xp_mpic_smp_cpu_init();
 777
 778         armada_370_xp_msi_init(node, main_int_res.start);
 779
 780         parent_irq = irq_of_parse_and_map(node, 0);
 781         if (parent_irq <= 0) {
 782                 irq_set_default_host(armada_370_xp_mpic_domain);
 783                 set_handle_irq(armada_370_xp_handle_irq);
 784 #ifdef CONFIG_SMP
 785                 armada_xp_ipi_init(node);
 786                 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
 787                                           "irqchip/armada/ipi:starting",
 788                                           armada_xp_mpic_starting_cpu, NULL);
 789 #endif
 790         } else {
 791 #ifdef CONFIG_SMP
 792                 cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_ARMADA_XP_STARTING,
 793                                           "irqchip/armada/cascade:starting",
 794                                           mpic_cascaded_starting_cpu, NULL);
 795 #endif
 796                 irq_set_chained_handler(parent_irq,
 797                                         armada_370_xp_mpic_handle_cascade_irq);
 798         }
 799
 800         register_syscore_ops(&armada_370_xp_mpic_syscore_ops);
 801
 802         return 0;
 803 }
 804
 805 IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);