linux/drivers/irqchip/irq-ti-sci-inta.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Texas Instruments' K3 Interrupt Aggregator irqchip driver
   4 *
   5 * Copyright (C) 2018-2019 Texas Instruments Incorporated - https://www.ti.com/
   6 *      Lokesh Vutla <lokeshvutla@ti.com>
   7 */
   8
   9#include <linux/err.h>
  10#include <linux/io.h>
  11#include <linux/irq.h>
  12#include <linux/irqchip.h>
  13#include <linux/irqdomain.h>
  14#include <linux/interrupt.h>
  15#include <linux/msi.h>
  16#include <linux/module.h>
  17#include <linux/moduleparam.h>
  18#include <linux/of_address.h>
  19#include <linux/of_irq.h>
  20#include <linux/of_platform.h>
  21#include <linux/irqchip/chained_irq.h>
  22#include <linux/soc/ti/ti_sci_inta_msi.h>
  23#include <linux/soc/ti/ti_sci_protocol.h>
  24#include <asm-generic/msi.h>
  25
  26#define TI_SCI_DEV_ID_MASK      0xffff
  27#define TI_SCI_DEV_ID_SHIFT     16
  28#define TI_SCI_IRQ_ID_MASK      0xffff
  29#define TI_SCI_IRQ_ID_SHIFT     0
  30#define HWIRQ_TO_DEVID(hwirq)   (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
  31                                 (TI_SCI_DEV_ID_MASK))
  32#define HWIRQ_TO_IRQID(hwirq)   ((hwirq) & (TI_SCI_IRQ_ID_MASK))
  33#define TO_HWIRQ(dev, index)    ((((dev) & TI_SCI_DEV_ID_MASK) << \
  34                                 TI_SCI_DEV_ID_SHIFT) | \
  35                                ((index) & TI_SCI_IRQ_ID_MASK))
  36
  37#define MAX_EVENTS_PER_VINT     64
  38#define VINT_ENABLE_SET_OFFSET  0x0
  39#define VINT_ENABLE_CLR_OFFSET  0x8
  40#define VINT_STATUS_OFFSET      0x18
  41#define VINT_STATUS_MASKED_OFFSET       0x20
  42
  43/**
  44 * struct ti_sci_inta_event_desc - Description of an event coming to
  45 *                                 Interrupt Aggregator. This serves
  46 *                                 as a mapping table for global event,
  47 *                                 hwirq and vint bit.
  48 * @global_event:       Global event number corresponding to this event
  49 * @hwirq:              Hwirq of the incoming interrupt
  50 * @vint_bit:           Corresponding vint bit to which this event is attached.
  51 */
  52struct ti_sci_inta_event_desc {
  53        u16 global_event;
  54        u32 hwirq;
  55        u8 vint_bit;
  56};
  57
  58/**
  59 * struct ti_sci_inta_vint_desc - Description of a virtual interrupt coming out
  60 *                                of Interrupt Aggregator.
  61 * @domain:             Pointer to IRQ domain to which this vint belongs.
  62 * @list:               List entry for the vint list
  63 * @event_map:          Bitmap to manage the allocation of events to vint.
  64 * @events:             Array of event descriptors assigned to this vint.
  65 * @parent_virq:        Linux IRQ number that gets attached to parent
  66 * @vint_id:            TISCI vint ID
  67 */
  68struct ti_sci_inta_vint_desc {
  69        struct irq_domain *domain;
  70        struct list_head list;
  71        DECLARE_BITMAP(event_map, MAX_EVENTS_PER_VINT);
  72        struct ti_sci_inta_event_desc events[MAX_EVENTS_PER_VINT];
  73        unsigned int parent_virq;
  74        u16 vint_id;
  75};
  76
  77/**
  78 * struct ti_sci_inta_irq_domain - Structure representing a TISCI based
  79 *                                 Interrupt Aggregator IRQ domain.
  80 * @sci:                Pointer to TISCI handle
  81 * @vint:               TISCI resource pointer representing IA interrupts.
  82 * @global_event:       TISCI resource pointer representing global events.
  83 * @vint_list:          List of the vints active in the system
  84 * @vint_mutex:         Mutex to protect vint_list
  85 * @base:               Base address of the memory mapped IO registers
  86 * @pdev:               Pointer to platform device.
  87 * @ti_sci_id:          TI-SCI device identifier
  88 * @unmapped_cnt:       Number of @unmapped_dev_ids entries
  89 * @unmapped_dev_ids:   Pointer to an array of TI-SCI device identifiers of
  90 *                      unmapped event sources.
  91 *                      Unmapped Events are not part of the Global Event Map and
  92 *                      they are converted to Global event within INTA to be
  93 *                      received by the same INTA to generate an interrupt.
  94 *                      In case an interrupt request comes for a device which is
  95 *                      generating Unmapped Event, we must use the INTA's TI-SCI
  96 *                      device identifier in place of the source device
  97 *                      identifier to let sysfw know where it has to program the
  98 *                      Global Event number.
  99 */
 100struct ti_sci_inta_irq_domain {
 101        const struct ti_sci_handle *sci;
 102        struct ti_sci_resource *vint;
 103        struct ti_sci_resource *global_event;
 104        struct list_head vint_list;
 105        /* Mutex to protect vint list */
 106        struct mutex vint_mutex;
 107        void __iomem *base;
 108        struct platform_device *pdev;
 109        u32 ti_sci_id;
 110
 111        int unmapped_cnt;
 112        u16 *unmapped_dev_ids;
 113};
 114
 115#define to_vint_desc(e, i) container_of(e, struct ti_sci_inta_vint_desc, \
 116                                        events[i])
 117
 118static u16 ti_sci_inta_get_dev_id(struct ti_sci_inta_irq_domain *inta, u32 hwirq)
 119{
 120        u16 dev_id = HWIRQ_TO_DEVID(hwirq);
 121        int i;
 122
 123        if (inta->unmapped_cnt == 0)
 124                return dev_id;
 125
 126        /*
 127         * For devices sending Unmapped Events we must use the INTA's TI-SCI
 128         * device identifier number to be able to convert it to a Global Event
 129         * and map it to an interrupt.
 130         */
 131        for (i = 0; i < inta->unmapped_cnt; i++) {
 132                if (dev_id == inta->unmapped_dev_ids[i]) {
 133                        dev_id = inta->ti_sci_id;
 134                        break;
 135                }
 136        }
 137
 138        return dev_id;
 139}
 140
 141/**
 142 * ti_sci_inta_irq_handler() - Chained IRQ handler for the vint irqs
 143 * @desc:       Pointer to irq_desc corresponding to the irq
 144 */
 145static void ti_sci_inta_irq_handler(struct irq_desc *desc)
 146{
 147        struct ti_sci_inta_vint_desc *vint_desc;
 148        struct ti_sci_inta_irq_domain *inta;
 149        struct irq_domain *domain;
 150        unsigned int virq, bit;
 151        unsigned long val;
 152
 153        vint_desc = irq_desc_get_handler_data(desc);
 154        domain = vint_desc->domain;
 155        inta = domain->host_data;
 156
 157        chained_irq_enter(irq_desc_get_chip(desc), desc);
 158
 159        val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 +
 160                            VINT_STATUS_MASKED_OFFSET);
 161
 162        for_each_set_bit(bit, &val, MAX_EVENTS_PER_VINT) {
 163                virq = irq_find_mapping(domain, vint_desc->events[bit].hwirq);
 164                if (virq)
 165                        generic_handle_irq(virq);
 166        }
 167
 168        chained_irq_exit(irq_desc_get_chip(desc), desc);
 169}
 170
 171/**
 172 * ti_sci_inta_xlate_irq() - Translate hwirq to parent's hwirq.
 173 * @inta:       IRQ domain corresponding to Interrupt Aggregator
 174 * @irq:        Hardware irq corresponding to the above irq domain
 175 *
 176 * Return parent irq number if translation is available else -ENOENT.
 177 */
 178static int ti_sci_inta_xlate_irq(struct ti_sci_inta_irq_domain *inta,
 179                                 u16 vint_id)
 180{
 181        struct device_node *np = dev_of_node(&inta->pdev->dev);
 182        u32 base, parent_base, size;
 183        const __be32 *range;
 184        int len;
 185
 186        range = of_get_property(np, "ti,interrupt-ranges", &len);
 187        if (!range)
 188                return vint_id;
 189
 190        for (len /= sizeof(*range); len >= 3; len -= 3) {
 191                base = be32_to_cpu(*range++);
 192                parent_base = be32_to_cpu(*range++);
 193                size = be32_to_cpu(*range++);
 194
 195                if (base <= vint_id && vint_id < base + size)
 196                        return vint_id - base + parent_base;
 197        }
 198
 199        return -ENOENT;
 200}
 201
 202/**
 203 * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator
 204 * @domain:     IRQ domain corresponding to Interrupt Aggregator
 205 *
 206 * Return 0 if all went well else corresponding error value.
 207 */
 208static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_domain *domain)
 209{
 210        struct ti_sci_inta_irq_domain *inta = domain->host_data;
 211        struct ti_sci_inta_vint_desc *vint_desc;
 212        struct irq_fwspec parent_fwspec;
 213        struct device_node *parent_node;
 214        unsigned int parent_virq;
 215        int p_hwirq, ret;
 216        u16 vint_id;
 217
 218        vint_id = ti_sci_get_free_resource(inta->vint);
 219        if (vint_id == TI_SCI_RESOURCE_NULL)
 220                return ERR_PTR(-EINVAL);
 221
 222        p_hwirq = ti_sci_inta_xlate_irq(inta, vint_id);
 223        if (p_hwirq < 0) {
 224                ret = p_hwirq;
 225                goto free_vint;
 226        }
 227
 228        vint_desc = kzalloc(sizeof(*vint_desc), GFP_KERNEL);
 229        if (!vint_desc) {
 230                ret = -ENOMEM;
 231                goto free_vint;
 232        }
 233
 234        vint_desc->domain = domain;
 235        vint_desc->vint_id = vint_id;
 236        INIT_LIST_HEAD(&vint_desc->list);
 237
 238        parent_node = of_irq_find_parent(dev_of_node(&inta->pdev->dev));
 239        parent_fwspec.fwnode = of_node_to_fwnode(parent_node);
 240
 241        if (of_device_is_compatible(parent_node, "arm,gic-v3")) {
 242                /* Parent is GIC */
 243                parent_fwspec.param_count = 3;
 244                parent_fwspec.param[0] = 0;
 245                parent_fwspec.param[1] = p_hwirq - 32;
 246                parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
 247        } else {
 248                /* Parent is Interrupt Router */
 249                parent_fwspec.param_count = 1;
 250                parent_fwspec.param[0] = p_hwirq;
 251        }
 252
 253        parent_virq = irq_create_fwspec_mapping(&parent_fwspec);
 254        if (parent_virq == 0) {
 255                dev_err(&inta->pdev->dev, "Parent IRQ allocation failed\n");
 256                ret = -EINVAL;
 257                goto free_vint_desc;
 258
 259        }
 260        vint_desc->parent_virq = parent_virq;
 261
 262        list_add_tail(&vint_desc->list, &inta->vint_list);
 263        irq_set_chained_handler_and_data(vint_desc->parent_virq,
 264                                         ti_sci_inta_irq_handler, vint_desc);
 265
 266        return vint_desc;
 267free_vint_desc:
 268        kfree(vint_desc);
 269free_vint:
 270        ti_sci_release_resource(inta->vint, vint_id);
 271        return ERR_PTR(ret);
 272}
 273
 274/**
 275 * ti_sci_inta_alloc_event() - Attach an event to a IA vint.
 276 * @vint_desc:  Pointer to vint_desc to which the event gets attached
 277 * @free_bit:   Bit inside vint to which event gets attached
 278 * @hwirq:      hwirq of the input event
 279 *
 280 * Return event_desc pointer if all went ok else appropriate error value.
 281 */
 282static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_event(struct ti_sci_inta_vint_desc *vint_desc,
 283                                                              u16 free_bit,
 284                                                              u32 hwirq)
 285{
 286        struct ti_sci_inta_irq_domain *inta = vint_desc->domain->host_data;
 287        struct ti_sci_inta_event_desc *event_desc;
 288        u16 dev_id, dev_index;
 289        int err;
 290
 291        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
 292        dev_index = HWIRQ_TO_IRQID(hwirq);
 293
 294        event_desc = &vint_desc->events[free_bit];
 295        event_desc->hwirq = hwirq;
 296        event_desc->vint_bit = free_bit;
 297        event_desc->global_event = ti_sci_get_free_resource(inta->global_event);
 298        if (event_desc->global_event == TI_SCI_RESOURCE_NULL)
 299                return ERR_PTR(-EINVAL);
 300
 301        err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci,
 302                                                      dev_id, dev_index,
 303                                                      inta->ti_sci_id,
 304                                                      vint_desc->vint_id,
 305                                                      event_desc->global_event,
 306                                                      free_bit);
 307        if (err)
 308                goto free_global_event;
 309
 310        return event_desc;
 311free_global_event:
 312        ti_sci_release_resource(inta->global_event, event_desc->global_event);
 313        return ERR_PTR(err);
 314}
 315
 316/**
 317 * ti_sci_inta_alloc_irq() -  Allocate an irq within INTA domain
 318 * @domain:     irq_domain pointer corresponding to INTA
 319 * @hwirq:      hwirq of the input event
 320 *
 321 * Note: Allocation happens in the following manner:
 322 *      - Find a free bit available in any of the vints available in the list.
 323 *      - If not found, allocate a vint from the vint pool
 324 *      - Attach the free bit to input hwirq.
 325 * Return event_desc if all went ok else appropriate error value.
 326 */
 327static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_irq(struct irq_domain *domain,
 328                                                            u32 hwirq)
 329{
 330        struct ti_sci_inta_irq_domain *inta = domain->host_data;
 331        struct ti_sci_inta_vint_desc *vint_desc = NULL;
 332        struct ti_sci_inta_event_desc *event_desc;
 333        u16 free_bit;
 334
 335        mutex_lock(&inta->vint_mutex);
 336        list_for_each_entry(vint_desc, &inta->vint_list, list) {
 337                free_bit = find_first_zero_bit(vint_desc->event_map,
 338                                               MAX_EVENTS_PER_VINT);
 339                if (free_bit != MAX_EVENTS_PER_VINT) {
 340                        set_bit(free_bit, vint_desc->event_map);
 341                        goto alloc_event;
 342                }
 343        }
 344
 345        /* No free bits available. Allocate a new vint */
 346        vint_desc = ti_sci_inta_alloc_parent_irq(domain);
 347        if (IS_ERR(vint_desc)) {
 348                event_desc = ERR_CAST(vint_desc);
 349                goto unlock;
 350        }
 351
 352        free_bit = find_first_zero_bit(vint_desc->event_map,
 353                                       MAX_EVENTS_PER_VINT);
 354        set_bit(free_bit, vint_desc->event_map);
 355
 356alloc_event:
 357        event_desc = ti_sci_inta_alloc_event(vint_desc, free_bit, hwirq);
 358        if (IS_ERR(event_desc))
 359                clear_bit(free_bit, vint_desc->event_map);
 360
 361unlock:
 362        mutex_unlock(&inta->vint_mutex);
 363        return event_desc;
 364}
 365
 366/**
 367 * ti_sci_inta_free_parent_irq() - Free a parent irq to INTA
 368 * @inta:       Pointer to inta domain.
 369 * @vint_desc:  Pointer to vint_desc that needs to be freed.
 370 */
 371static void ti_sci_inta_free_parent_irq(struct ti_sci_inta_irq_domain *inta,
 372                                        struct ti_sci_inta_vint_desc *vint_desc)
 373{
 374        if (find_first_bit(vint_desc->event_map, MAX_EVENTS_PER_VINT) == MAX_EVENTS_PER_VINT) {
 375                list_del(&vint_desc->list);
 376                ti_sci_release_resource(inta->vint, vint_desc->vint_id);
 377                irq_dispose_mapping(vint_desc->parent_virq);
 378                kfree(vint_desc);
 379        }
 380}
 381
 382/**
 383 * ti_sci_inta_free_irq() - Free an IRQ within INTA domain
 384 * @event_desc: Pointer to event_desc that needs to be freed.
 385 * @hwirq:      Hwirq number within INTA domain that needs to be freed
 386 */
 387static void ti_sci_inta_free_irq(struct ti_sci_inta_event_desc *event_desc,
 388                                 u32 hwirq)
 389{
 390        struct ti_sci_inta_vint_desc *vint_desc;
 391        struct ti_sci_inta_irq_domain *inta;
 392        u16 dev_id;
 393
 394        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
 395        inta = vint_desc->domain->host_data;
 396        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
 397        /* free event irq */
 398        mutex_lock(&inta->vint_mutex);
 399        inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
 400                                                 dev_id, HWIRQ_TO_IRQID(hwirq),
 401                                                 inta->ti_sci_id,
 402                                                 vint_desc->vint_id,
 403                                                 event_desc->global_event,
 404                                                 event_desc->vint_bit);
 405
 406        clear_bit(event_desc->vint_bit, vint_desc->event_map);
 407        ti_sci_release_resource(inta->global_event, event_desc->global_event);
 408        event_desc->global_event = TI_SCI_RESOURCE_NULL;
 409        event_desc->hwirq = 0;
 410
 411        ti_sci_inta_free_parent_irq(inta, vint_desc);
 412        mutex_unlock(&inta->vint_mutex);
 413}
 414
 415/**
 416 * ti_sci_inta_request_resources() - Allocate resources for input irq
 417 * @data: Pointer to corresponding irq_data
 418 *
 419 * Note: This is the core api where the actual allocation happens for input
 420 *       hwirq. This allocation involves creating a parent irq for vint.
 421 *       If this is done in irq_domain_ops.alloc() then a deadlock is reached
 422 *       for allocation. So this allocation is being done in request_resources()
 423 *
 424 * Return: 0 if all went well else corresponding error.
 425 */
 426static int ti_sci_inta_request_resources(struct irq_data *data)
 427{
 428        struct ti_sci_inta_event_desc *event_desc;
 429
 430        event_desc = ti_sci_inta_alloc_irq(data->domain, data->hwirq);
 431        if (IS_ERR(event_desc))
 432                return PTR_ERR(event_desc);
 433
 434        data->chip_data = event_desc;
 435
 436        return 0;
 437}
 438
 439/**
 440 * ti_sci_inta_release_resources - Release resources for input irq
 441 * @data: Pointer to corresponding irq_data
 442 *
 443 * Note: Corresponding to request_resources(), all the unmapping and deletion
 444 *       of parent vint irqs happens in this api.
 445 */
 446static void ti_sci_inta_release_resources(struct irq_data *data)
 447{
 448        struct ti_sci_inta_event_desc *event_desc;
 449
 450        event_desc = irq_data_get_irq_chip_data(data);
 451        ti_sci_inta_free_irq(event_desc, data->hwirq);
 452}
 453
 454/**
 455 * ti_sci_inta_manage_event() - Control the event based on the offset
 456 * @data:       Pointer to corresponding irq_data
 457 * @offset:     register offset using which event is controlled.
 458 */
 459static void ti_sci_inta_manage_event(struct irq_data *data, u32 offset)
 460{
 461        struct ti_sci_inta_event_desc *event_desc;
 462        struct ti_sci_inta_vint_desc *vint_desc;
 463        struct ti_sci_inta_irq_domain *inta;
 464
 465        event_desc = irq_data_get_irq_chip_data(data);
 466        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
 467        inta = data->domain->host_data;
 468
 469        writeq_relaxed(BIT(event_desc->vint_bit),
 470                       inta->base + vint_desc->vint_id * 0x1000 + offset);
 471}
 472
 473/**
 474 * ti_sci_inta_mask_irq() - Mask an event
 475 * @data:       Pointer to corresponding irq_data
 476 */
 477static void ti_sci_inta_mask_irq(struct irq_data *data)
 478{
 479        ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET);
 480}
 481
 482/**
 483 * ti_sci_inta_unmask_irq() - Unmask an event
 484 * @data:       Pointer to corresponding irq_data
 485 */
 486static void ti_sci_inta_unmask_irq(struct irq_data *data)
 487{
 488        ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET);
 489}
 490
 491/**
 492 * ti_sci_inta_ack_irq() - Ack an event
 493 * @data:       Pointer to corresponding irq_data
 494 */
 495static void ti_sci_inta_ack_irq(struct irq_data *data)
 496{
 497        /*
 498         * Do not clear the event if hardware is capable of sending
 499         * a down event.
 500         */
 501        if (irqd_get_trigger_type(data) != IRQF_TRIGGER_HIGH)
 502                ti_sci_inta_manage_event(data, VINT_STATUS_OFFSET);
 503}
 504
 505static int ti_sci_inta_set_affinity(struct irq_data *d,
 506                                    const struct cpumask *mask_val, bool force)
 507{
 508        return -EINVAL;
 509}
 510
 511/**
 512 * ti_sci_inta_set_type() - Update the trigger type of the irq.
 513 * @data:       Pointer to corresponding irq_data
 514 * @type:       Trigger type as specified by user
 515 *
 516 * Note: This updates the handle_irq callback for level msi.
 517 *
 518 * Return 0 if all went well else appropriate error.
 519 */
 520static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type)
 521{
 522        /*
 523         * .alloc default sets handle_edge_irq. But if the user specifies
 524         * that IRQ is level MSI, then update the handle to handle_level_irq
 525         */
 526        switch (type & IRQ_TYPE_SENSE_MASK) {
 527        case IRQF_TRIGGER_HIGH:
 528                irq_set_handler_locked(data, handle_level_irq);
 529                return 0;
 530        case IRQF_TRIGGER_RISING:
 531                return 0;
 532        default:
 533                return -EINVAL;
 534        }
 535}
 536
 537static struct irq_chip ti_sci_inta_irq_chip = {
 538        .name                   = "INTA",
 539        .irq_ack                = ti_sci_inta_ack_irq,
 540        .irq_mask               = ti_sci_inta_mask_irq,
 541        .irq_set_type           = ti_sci_inta_set_type,
 542        .irq_unmask             = ti_sci_inta_unmask_irq,
 543        .irq_set_affinity       = ti_sci_inta_set_affinity,
 544        .irq_request_resources  = ti_sci_inta_request_resources,
 545        .irq_release_resources  = ti_sci_inta_release_resources,
 546};
 547
 548/**
 549 * ti_sci_inta_irq_domain_free() - Free an IRQ from the IRQ domain
 550 * @domain:     Domain to which the irqs belong
 551 * @virq:       base linux virtual IRQ to be freed.
 552 * @nr_irqs:    Number of continuous irqs to be freed
 553 */
 554static void ti_sci_inta_irq_domain_free(struct irq_domain *domain,
 555                                        unsigned int virq, unsigned int nr_irqs)
 556{
 557        struct irq_data *data = irq_domain_get_irq_data(domain, virq);
 558
 559        irq_domain_reset_irq_data(data);
 560}
 561
 562/**
 563 * ti_sci_inta_irq_domain_alloc() - Allocate Interrupt aggregator IRQs
 564 * @domain:     Point to the interrupt aggregator IRQ domain
 565 * @virq:       Corresponding Linux virtual IRQ number
 566 * @nr_irqs:    Continuous irqs to be allocated
 567 * @data:       Pointer to firmware specifier
 568 *
 569 * No actual allocation happens here.
 570 *
 571 * Return 0 if all went well else appropriate error value.
 572 */
 573static int ti_sci_inta_irq_domain_alloc(struct irq_domain *domain,
 574                                        unsigned int virq, unsigned int nr_irqs,
 575                                        void *data)
 576{
 577        msi_alloc_info_t *arg = data;
 578
 579        irq_domain_set_info(domain, virq, arg->hwirq, &ti_sci_inta_irq_chip,
 580                            NULL, handle_edge_irq, NULL, NULL);
 581
 582        return 0;
 583}
 584
 585static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = {
 586        .free           = ti_sci_inta_irq_domain_free,
 587        .alloc          = ti_sci_inta_irq_domain_alloc,
 588};
 589
 590static struct irq_chip ti_sci_inta_msi_irq_chip = {
 591        .name                   = "MSI-INTA",
 592        .flags                  = IRQCHIP_SUPPORTS_LEVEL_MSI,
 593};
 594
 595static void ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg,
 596                                     struct msi_desc *desc)
 597{
 598        struct platform_device *pdev = to_platform_device(desc->dev);
 599
 600        arg->desc = desc;
 601        arg->hwirq = TO_HWIRQ(pdev->id, desc->inta.dev_index);
 602}
 603
 604static struct msi_domain_ops ti_sci_inta_msi_ops = {
 605        .set_desc       = ti_sci_inta_msi_set_desc,
 606};
 607
 608static struct msi_domain_info ti_sci_inta_msi_domain_info = {
 609        .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 610                   MSI_FLAG_LEVEL_CAPABLE),
 611        .ops    = &ti_sci_inta_msi_ops,
 612        .chip   = &ti_sci_inta_msi_irq_chip,
 613};
 614
 615static int ti_sci_inta_get_unmapped_sources(struct ti_sci_inta_irq_domain *inta)
 616{
 617        struct device *dev = &inta->pdev->dev;
 618        struct device_node *node = dev_of_node(dev);
 619        struct of_phandle_iterator it;
 620        int count, err, ret, i;
 621
 622        count = of_count_phandle_with_args(node, "ti,unmapped-event-sources", NULL);
 623        if (count <= 0)
 624                return 0;
 625
 626        inta->unmapped_dev_ids = devm_kcalloc(dev, count,
 627                                              sizeof(*inta->unmapped_dev_ids),
 628                                              GFP_KERNEL);
 629        if (!inta->unmapped_dev_ids)
 630                return -ENOMEM;
 631
 632        i = 0;
 633        of_for_each_phandle(&it, err, node, "ti,unmapped-event-sources", NULL, 0) {
 634                u32 dev_id;
 635
 636                ret = of_property_read_u32(it.node, "ti,sci-dev-id", &dev_id);
 637                if (ret) {
 638                        dev_err(dev, "ti,sci-dev-id read failure for %pOFf\n", it.node);
 639                        of_node_put(it.node);
 640                        return ret;
 641                }
 642                inta->unmapped_dev_ids[i++] = dev_id;
 643        }
 644
 645        inta->unmapped_cnt = count;
 646
 647        return 0;
 648}
 649
 650static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
 651{
 652        struct irq_domain *parent_domain, *domain, *msi_domain;
 653        struct device_node *parent_node, *node;
 654        struct ti_sci_inta_irq_domain *inta;
 655        struct device *dev = &pdev->dev;
 656        struct resource *res;
 657        int ret;
 658
 659        node = dev_of_node(dev);
 660        parent_node = of_irq_find_parent(node);
 661        if (!parent_node) {
 662                dev_err(dev, "Failed to get IRQ parent node\n");
 663                return -ENODEV;
 664        }
 665
 666        parent_domain = irq_find_host(parent_node);
 667        if (!parent_domain)
 668                return -EPROBE_DEFER;
 669
 670        inta = devm_kzalloc(dev, sizeof(*inta), GFP_KERNEL);
 671        if (!inta)
 672                return -ENOMEM;
 673
 674        inta->pdev = pdev;
 675        inta->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
 676        if (IS_ERR(inta->sci))
 677                return dev_err_probe(dev, PTR_ERR(inta->sci),
 678                                     "ti,sci read fail\n");
 679
 680        ret = of_property_read_u32(dev->of_node, "ti,sci-dev-id", &inta->ti_sci_id);
 681        if (ret) {
 682                dev_err(dev, "missing 'ti,sci-dev-id' property\n");
 683                return -EINVAL;
 684        }
 685
 686        inta->vint = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
 687                                              TI_SCI_RESASG_SUBTYPE_IA_VINT);
 688        if (IS_ERR(inta->vint)) {
 689                dev_err(dev, "VINT resource allocation failed\n");
 690                return PTR_ERR(inta->vint);
 691        }
 692
 693        inta->global_event = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
 694                                                      TI_SCI_RESASG_SUBTYPE_GLOBAL_EVENT_SEVT);
 695        if (IS_ERR(inta->global_event)) {
 696                dev_err(dev, "Global event resource allocation failed\n");
 697                return PTR_ERR(inta->global_event);
 698        }
 699
 700        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 701        inta->base = devm_ioremap_resource(dev, res);
 702        if (IS_ERR(inta->base))
 703                return PTR_ERR(inta->base);
 704
 705        ret = ti_sci_inta_get_unmapped_sources(inta);
 706        if (ret)
 707                return ret;
 708
 709        domain = irq_domain_add_linear(dev_of_node(dev),
 710                                       ti_sci_get_num_resources(inta->vint),
 711                                       &ti_sci_inta_irq_domain_ops, inta);
 712        if (!domain) {
 713                dev_err(dev, "Failed to allocate IRQ domain\n");
 714                return -ENOMEM;
 715        }
 716
 717        msi_domain = ti_sci_inta_msi_create_irq_domain(of_node_to_fwnode(node),
 718                                                &ti_sci_inta_msi_domain_info,
 719                                                domain);
 720        if (!msi_domain) {
 721                irq_domain_remove(domain);
 722                dev_err(dev, "Failed to allocate msi domain\n");
 723                return -ENOMEM;
 724        }
 725
 726        INIT_LIST_HEAD(&inta->vint_list);
 727        mutex_init(&inta->vint_mutex);
 728
 729        dev_info(dev, "Interrupt Aggregator domain %d created\n", inta->ti_sci_id);
 730
 731        return 0;
 732}
 733
 734static const struct of_device_id ti_sci_inta_irq_domain_of_match[] = {
 735        { .compatible = "ti,sci-inta", },
 736        { /* sentinel */ },
 737};
 738MODULE_DEVICE_TABLE(of, ti_sci_inta_irq_domain_of_match);
 739
 740static struct platform_driver ti_sci_inta_irq_domain_driver = {
 741        .probe = ti_sci_inta_irq_domain_probe,
 742        .driver = {
 743                .name = "ti-sci-inta",
 744                .of_match_table = ti_sci_inta_irq_domain_of_match,
 745        },
 746};
 747module_platform_driver(ti_sci_inta_irq_domain_driver);
 748
 749MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ti.com>");
 750MODULE_DESCRIPTION("K3 Interrupt Aggregator driver over TI SCI protocol");
 751MODULE_LICENSE("GPL v2");
 752