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 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                generic_handle_domain_irq(domain, vint_desc->events[bit].hwirq);
 164
 165        chained_irq_exit(irq_desc_get_chip(desc), desc);
 166}
 167
 168/**
 169 * ti_sci_inta_xlate_irq() - Translate hwirq to parent's hwirq.
 170 * @inta:       IRQ domain corresponding to Interrupt Aggregator
 171 * @irq:        Hardware irq corresponding to the above irq domain
 172 *
 173 * Return parent irq number if translation is available else -ENOENT.
 174 */
 175static int ti_sci_inta_xlate_irq(struct ti_sci_inta_irq_domain *inta,
 176                                 u16 vint_id)
 177{
 178        struct device_node *np = dev_of_node(&inta->pdev->dev);
 179        u32 base, parent_base, size;
 180        const __be32 *range;
 181        int len;
 182
 183        range = of_get_property(np, "ti,interrupt-ranges", &len);
 184        if (!range)
 185                return vint_id;
 186
 187        for (len /= sizeof(*range); len >= 3; len -= 3) {
 188                base = be32_to_cpu(*range++);
 189                parent_base = be32_to_cpu(*range++);
 190                size = be32_to_cpu(*range++);
 191
 192                if (base <= vint_id && vint_id < base + size)
 193                        return vint_id - base + parent_base;
 194        }
 195
 196        return -ENOENT;
 197}
 198
 199/**
 200 * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator
 201 * @domain:     IRQ domain corresponding to Interrupt Aggregator
 202 *
 203 * Return 0 if all went well else corresponding error value.
 204 */
 205static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_domain *domain)
 206{
 207        struct ti_sci_inta_irq_domain *inta = domain->host_data;
 208        struct ti_sci_inta_vint_desc *vint_desc;
 209        struct irq_fwspec parent_fwspec;
 210        struct device_node *parent_node;
 211        unsigned int parent_virq;
 212        int p_hwirq, ret;
 213        u16 vint_id;
 214
 215        vint_id = ti_sci_get_free_resource(inta->vint);
 216        if (vint_id == TI_SCI_RESOURCE_NULL)
 217                return ERR_PTR(-EINVAL);
 218
 219        p_hwirq = ti_sci_inta_xlate_irq(inta, vint_id);
 220        if (p_hwirq < 0) {
 221                ret = p_hwirq;
 222                goto free_vint;
 223        }
 224
 225        vint_desc = kzalloc(sizeof(*vint_desc), GFP_KERNEL);
 226        if (!vint_desc) {
 227                ret = -ENOMEM;
 228                goto free_vint;
 229        }
 230
 231        vint_desc->domain = domain;
 232        vint_desc->vint_id = vint_id;
 233        INIT_LIST_HEAD(&vint_desc->list);
 234
 235        parent_node = of_irq_find_parent(dev_of_node(&inta->pdev->dev));
 236        parent_fwspec.fwnode = of_node_to_fwnode(parent_node);
 237
 238        if (of_device_is_compatible(parent_node, "arm,gic-v3")) {
 239                /* Parent is GIC */
 240                parent_fwspec.param_count = 3;
 241                parent_fwspec.param[0] = 0;
 242                parent_fwspec.param[1] = p_hwirq - 32;
 243                parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
 244        } else {
 245                /* Parent is Interrupt Router */
 246                parent_fwspec.param_count = 1;
 247                parent_fwspec.param[0] = p_hwirq;
 248        }
 249
 250        parent_virq = irq_create_fwspec_mapping(&parent_fwspec);
 251        if (parent_virq == 0) {
 252                dev_err(&inta->pdev->dev, "Parent IRQ allocation failed\n");
 253                ret = -EINVAL;
 254                goto free_vint_desc;
 255
 256        }
 257        vint_desc->parent_virq = parent_virq;
 258
 259        list_add_tail(&vint_desc->list, &inta->vint_list);
 260        irq_set_chained_handler_and_data(vint_desc->parent_virq,
 261                                         ti_sci_inta_irq_handler, vint_desc);
 262
 263        return vint_desc;
 264free_vint_desc:
 265        kfree(vint_desc);
 266free_vint:
 267        ti_sci_release_resource(inta->vint, vint_id);
 268        return ERR_PTR(ret);
 269}
 270
 271/**
 272 * ti_sci_inta_alloc_event() - Attach an event to a IA vint.
 273 * @vint_desc:  Pointer to vint_desc to which the event gets attached
 274 * @free_bit:   Bit inside vint to which event gets attached
 275 * @hwirq:      hwirq of the input event
 276 *
 277 * Return event_desc pointer if all went ok else appropriate error value.
 278 */
 279static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_event(struct ti_sci_inta_vint_desc *vint_desc,
 280                                                              u16 free_bit,
 281                                                              u32 hwirq)
 282{
 283        struct ti_sci_inta_irq_domain *inta = vint_desc->domain->host_data;
 284        struct ti_sci_inta_event_desc *event_desc;
 285        u16 dev_id, dev_index;
 286        int err;
 287
 288        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
 289        dev_index = HWIRQ_TO_IRQID(hwirq);
 290
 291        event_desc = &vint_desc->events[free_bit];
 292        event_desc->hwirq = hwirq;
 293        event_desc->vint_bit = free_bit;
 294        event_desc->global_event = ti_sci_get_free_resource(inta->global_event);
 295        if (event_desc->global_event == TI_SCI_RESOURCE_NULL)
 296                return ERR_PTR(-EINVAL);
 297
 298        err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci,
 299                                                      dev_id, dev_index,
 300                                                      inta->ti_sci_id,
 301                                                      vint_desc->vint_id,
 302                                                      event_desc->global_event,
 303                                                      free_bit);
 304        if (err)
 305                goto free_global_event;
 306
 307        return event_desc;
 308free_global_event:
 309        ti_sci_release_resource(inta->global_event, event_desc->global_event);
 310        return ERR_PTR(err);
 311}
 312
 313/**
 314 * ti_sci_inta_alloc_irq() -  Allocate an irq within INTA domain
 315 * @domain:     irq_domain pointer corresponding to INTA
 316 * @hwirq:      hwirq of the input event
 317 *
 318 * Note: Allocation happens in the following manner:
 319 *      - Find a free bit available in any of the vints available in the list.
 320 *      - If not found, allocate a vint from the vint pool
 321 *      - Attach the free bit to input hwirq.
 322 * Return event_desc if all went ok else appropriate error value.
 323 */
 324static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_irq(struct irq_domain *domain,
 325                                                            u32 hwirq)
 326{
 327        struct ti_sci_inta_irq_domain *inta = domain->host_data;
 328        struct ti_sci_inta_vint_desc *vint_desc = NULL;
 329        struct ti_sci_inta_event_desc *event_desc;
 330        u16 free_bit;
 331
 332        mutex_lock(&inta->vint_mutex);
 333        list_for_each_entry(vint_desc, &inta->vint_list, list) {
 334                free_bit = find_first_zero_bit(vint_desc->event_map,
 335                                               MAX_EVENTS_PER_VINT);
 336                if (free_bit != MAX_EVENTS_PER_VINT) {
 337                        set_bit(free_bit, vint_desc->event_map);
 338                        goto alloc_event;
 339                }
 340        }
 341
 342        /* No free bits available. Allocate a new vint */
 343        vint_desc = ti_sci_inta_alloc_parent_irq(domain);
 344        if (IS_ERR(vint_desc)) {
 345                event_desc = ERR_CAST(vint_desc);
 346                goto unlock;
 347        }
 348
 349        free_bit = find_first_zero_bit(vint_desc->event_map,
 350                                       MAX_EVENTS_PER_VINT);
 351        set_bit(free_bit, vint_desc->event_map);
 352
 353alloc_event:
 354        event_desc = ti_sci_inta_alloc_event(vint_desc, free_bit, hwirq);
 355        if (IS_ERR(event_desc))
 356                clear_bit(free_bit, vint_desc->event_map);
 357
 358unlock:
 359        mutex_unlock(&inta->vint_mutex);
 360        return event_desc;
 361}
 362
 363/**
 364 * ti_sci_inta_free_parent_irq() - Free a parent irq to INTA
 365 * @inta:       Pointer to inta domain.
 366 * @vint_desc:  Pointer to vint_desc that needs to be freed.
 367 */
 368static void ti_sci_inta_free_parent_irq(struct ti_sci_inta_irq_domain *inta,
 369                                        struct ti_sci_inta_vint_desc *vint_desc)
 370{
 371        if (find_first_bit(vint_desc->event_map, MAX_EVENTS_PER_VINT) == MAX_EVENTS_PER_VINT) {
 372                list_del(&vint_desc->list);
 373                ti_sci_release_resource(inta->vint, vint_desc->vint_id);
 374                irq_dispose_mapping(vint_desc->parent_virq);
 375                kfree(vint_desc);
 376        }
 377}
 378
 379/**
 380 * ti_sci_inta_free_irq() - Free an IRQ within INTA domain
 381 * @event_desc: Pointer to event_desc that needs to be freed.
 382 * @hwirq:      Hwirq number within INTA domain that needs to be freed
 383 */
 384static void ti_sci_inta_free_irq(struct ti_sci_inta_event_desc *event_desc,
 385                                 u32 hwirq)
 386{
 387        struct ti_sci_inta_vint_desc *vint_desc;
 388        struct ti_sci_inta_irq_domain *inta;
 389        u16 dev_id;
 390
 391        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
 392        inta = vint_desc->domain->host_data;
 393        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
 394        /* free event irq */
 395        mutex_lock(&inta->vint_mutex);
 396        inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
 397                                                 dev_id, HWIRQ_TO_IRQID(hwirq),
 398                                                 inta->ti_sci_id,
 399                                                 vint_desc->vint_id,
 400                                                 event_desc->global_event,
 401                                                 event_desc->vint_bit);
 402
 403        clear_bit(event_desc->vint_bit, vint_desc->event_map);
 404        ti_sci_release_resource(inta->global_event, event_desc->global_event);
 405        event_desc->global_event = TI_SCI_RESOURCE_NULL;
 406        event_desc->hwirq = 0;
 407
 408        ti_sci_inta_free_parent_irq(inta, vint_desc);
 409        mutex_unlock(&inta->vint_mutex);
 410}
 411
 412/**
 413 * ti_sci_inta_request_resources() - Allocate resources for input irq
 414 * @data: Pointer to corresponding irq_data
 415 *
 416 * Note: This is the core api where the actual allocation happens for input
 417 *       hwirq. This allocation involves creating a parent irq for vint.
 418 *       If this is done in irq_domain_ops.alloc() then a deadlock is reached
 419 *       for allocation. So this allocation is being done in request_resources()
 420 *
 421 * Return: 0 if all went well else corresponding error.
 422 */
 423static int ti_sci_inta_request_resources(struct irq_data *data)
 424{
 425        struct ti_sci_inta_event_desc *event_desc;
 426
 427        event_desc = ti_sci_inta_alloc_irq(data->domain, data->hwirq);
 428        if (IS_ERR(event_desc))
 429                return PTR_ERR(event_desc);
 430
 431        data->chip_data = event_desc;
 432
 433        return 0;
 434}
 435
 436/**
 437 * ti_sci_inta_release_resources - Release resources for input irq
 438 * @data: Pointer to corresponding irq_data
 439 *
 440 * Note: Corresponding to request_resources(), all the unmapping and deletion
 441 *       of parent vint irqs happens in this api.
 442 */
 443static void ti_sci_inta_release_resources(struct irq_data *data)
 444{
 445        struct ti_sci_inta_event_desc *event_desc;
 446
 447        event_desc = irq_data_get_irq_chip_data(data);
 448        ti_sci_inta_free_irq(event_desc, data->hwirq);
 449}
 450
 451/**
 452 * ti_sci_inta_manage_event() - Control the event based on the offset
 453 * @data:       Pointer to corresponding irq_data
 454 * @offset:     register offset using which event is controlled.
 455 */
 456static void ti_sci_inta_manage_event(struct irq_data *data, u32 offset)
 457{
 458        struct ti_sci_inta_event_desc *event_desc;
 459        struct ti_sci_inta_vint_desc *vint_desc;
 460        struct ti_sci_inta_irq_domain *inta;
 461
 462        event_desc = irq_data_get_irq_chip_data(data);
 463        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
 464        inta = data->domain->host_data;
 465
 466        writeq_relaxed(BIT(event_desc->vint_bit),
 467                       inta->base + vint_desc->vint_id * 0x1000 + offset);
 468}
 469
 470/**
 471 * ti_sci_inta_mask_irq() - Mask an event
 472 * @data:       Pointer to corresponding irq_data
 473 */
 474static void ti_sci_inta_mask_irq(struct irq_data *data)
 475{
 476        ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET);
 477}
 478
 479/**
 480 * ti_sci_inta_unmask_irq() - Unmask an event
 481 * @data:       Pointer to corresponding irq_data
 482 */
 483static void ti_sci_inta_unmask_irq(struct irq_data *data)
 484{
 485        ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET);
 486}
 487
 488/**
 489 * ti_sci_inta_ack_irq() - Ack an event
 490 * @data:       Pointer to corresponding irq_data
 491 */
 492static void ti_sci_inta_ack_irq(struct irq_data *data)
 493{
 494        /*
 495         * Do not clear the event if hardware is capable of sending
 496         * a down event.
 497         */
 498        if (irqd_get_trigger_type(data) != IRQF_TRIGGER_HIGH)
 499                ti_sci_inta_manage_event(data, VINT_STATUS_OFFSET);
 500}
 501
 502static int ti_sci_inta_set_affinity(struct irq_data *d,
 503                                    const struct cpumask *mask_val, bool force)
 504{
 505        return -EINVAL;
 506}
 507
 508/**
 509 * ti_sci_inta_set_type() - Update the trigger type of the irq.
 510 * @data:       Pointer to corresponding irq_data
 511 * @type:       Trigger type as specified by user
 512 *
 513 * Note: This updates the handle_irq callback for level msi.
 514 *
 515 * Return 0 if all went well else appropriate error.
 516 */
 517static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type)
 518{
 519        /*
 520         * .alloc default sets handle_edge_irq. But if the user specifies
 521         * that IRQ is level MSI, then update the handle to handle_level_irq
 522         */
 523        switch (type & IRQ_TYPE_SENSE_MASK) {
 524        case IRQF_TRIGGER_HIGH:
 525                irq_set_handler_locked(data, handle_level_irq);
 526                return 0;
 527        case IRQF_TRIGGER_RISING:
 528                return 0;
 529        default:
 530                return -EINVAL;
 531        }
 532}
 533
 534static struct irq_chip ti_sci_inta_irq_chip = {
 535        .name                   = "INTA",
 536        .irq_ack                = ti_sci_inta_ack_irq,
 537        .irq_mask               = ti_sci_inta_mask_irq,
 538        .irq_set_type           = ti_sci_inta_set_type,
 539        .irq_unmask             = ti_sci_inta_unmask_irq,
 540        .irq_set_affinity       = ti_sci_inta_set_affinity,
 541        .irq_request_resources  = ti_sci_inta_request_resources,
 542        .irq_release_resources  = ti_sci_inta_release_resources,
 543};
 544
 545/**
 546 * ti_sci_inta_irq_domain_free() - Free an IRQ from the IRQ domain
 547 * @domain:     Domain to which the irqs belong
 548 * @virq:       base linux virtual IRQ to be freed.
 549 * @nr_irqs:    Number of continuous irqs to be freed
 550 */
 551static void ti_sci_inta_irq_domain_free(struct irq_domain *domain,
 552                                        unsigned int virq, unsigned int nr_irqs)
 553{
 554        struct irq_data *data = irq_domain_get_irq_data(domain, virq);
 555
 556        irq_domain_reset_irq_data(data);
 557}
 558
 559/**
 560 * ti_sci_inta_irq_domain_alloc() - Allocate Interrupt aggregator IRQs
 561 * @domain:     Point to the interrupt aggregator IRQ domain
 562 * @virq:       Corresponding Linux virtual IRQ number
 563 * @nr_irqs:    Continuous irqs to be allocated
 564 * @data:       Pointer to firmware specifier
 565 *
 566 * No actual allocation happens here.
 567 *
 568 * Return 0 if all went well else appropriate error value.
 569 */
 570static int ti_sci_inta_irq_domain_alloc(struct irq_domain *domain,
 571                                        unsigned int virq, unsigned int nr_irqs,
 572                                        void *data)
 573{
 574        msi_alloc_info_t *arg = data;
 575
 576        irq_domain_set_info(domain, virq, arg->hwirq, &ti_sci_inta_irq_chip,
 577                            NULL, handle_edge_irq, NULL, NULL);
 578
 579        return 0;
 580}
 581
 582static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = {
 583        .free           = ti_sci_inta_irq_domain_free,
 584        .alloc          = ti_sci_inta_irq_domain_alloc,
 585};
 586
 587static struct irq_chip ti_sci_inta_msi_irq_chip = {
 588        .name                   = "MSI-INTA",
 589        .flags                  = IRQCHIP_SUPPORTS_LEVEL_MSI,
 590};
 591
 592static void ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg,
 593                                     struct msi_desc *desc)
 594{
 595        struct platform_device *pdev = to_platform_device(desc->dev);
 596
 597        arg->desc = desc;
 598        arg->hwirq = TO_HWIRQ(pdev->id, desc->inta.dev_index);
 599}
 600
 601static struct msi_domain_ops ti_sci_inta_msi_ops = {
 602        .set_desc       = ti_sci_inta_msi_set_desc,
 603};
 604
 605static struct msi_domain_info ti_sci_inta_msi_domain_info = {
 606        .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 607                   MSI_FLAG_LEVEL_CAPABLE),
 608        .ops    = &ti_sci_inta_msi_ops,
 609        .chip   = &ti_sci_inta_msi_irq_chip,
 610};
 611
 612static int ti_sci_inta_get_unmapped_sources(struct ti_sci_inta_irq_domain *inta)
 613{
 614        struct device *dev = &inta->pdev->dev;
 615        struct device_node *node = dev_of_node(dev);
 616        struct of_phandle_iterator it;
 617        int count, err, ret, i;
 618
 619        count = of_count_phandle_with_args(node, "ti,unmapped-event-sources", NULL);
 620        if (count <= 0)
 621                return 0;
 622
 623        inta->unmapped_dev_ids = devm_kcalloc(dev, count,
 624                                              sizeof(*inta->unmapped_dev_ids),
 625                                              GFP_KERNEL);
 626        if (!inta->unmapped_dev_ids)
 627                return -ENOMEM;
 628
 629        i = 0;
 630        of_for_each_phandle(&it, err, node, "ti,unmapped-event-sources", NULL, 0) {
 631                u32 dev_id;
 632
 633                ret = of_property_read_u32(it.node, "ti,sci-dev-id", &dev_id);
 634                if (ret) {
 635                        dev_err(dev, "ti,sci-dev-id read failure for %pOFf\n", it.node);
 636                        of_node_put(it.node);
 637                        return ret;
 638                }
 639                inta->unmapped_dev_ids[i++] = dev_id;
 640        }
 641
 642        inta->unmapped_cnt = count;
 643
 644        return 0;
 645}
 646
 647static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
 648{
 649        struct irq_domain *parent_domain, *domain, *msi_domain;
 650        struct device_node *parent_node, *node;
 651        struct ti_sci_inta_irq_domain *inta;
 652        struct device *dev = &pdev->dev;
 653        struct resource *res;
 654        int ret;
 655
 656        node = dev_of_node(dev);
 657        parent_node = of_irq_find_parent(node);
 658        if (!parent_node) {
 659                dev_err(dev, "Failed to get IRQ parent node\n");
 660                return -ENODEV;
 661        }
 662
 663        parent_domain = irq_find_host(parent_node);
 664        if (!parent_domain)
 665                return -EPROBE_DEFER;
 666
 667        inta = devm_kzalloc(dev, sizeof(*inta), GFP_KERNEL);
 668        if (!inta)
 669                return -ENOMEM;
 670
 671        inta->pdev = pdev;
 672        inta->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
 673        if (IS_ERR(inta->sci))
 674                return dev_err_probe(dev, PTR_ERR(inta->sci),
 675                                     "ti,sci read fail\n");
 676
 677        ret = of_property_read_u32(dev->of_node, "ti,sci-dev-id", &inta->ti_sci_id);
 678        if (ret) {
 679                dev_err(dev, "missing 'ti,sci-dev-id' property\n");
 680                return -EINVAL;
 681        }
 682
 683        inta->vint = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
 684                                              TI_SCI_RESASG_SUBTYPE_IA_VINT);
 685        if (IS_ERR(inta->vint)) {
 686                dev_err(dev, "VINT resource allocation failed\n");
 687                return PTR_ERR(inta->vint);
 688        }
 689
 690        inta->global_event = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
 691                                                      TI_SCI_RESASG_SUBTYPE_GLOBAL_EVENT_SEVT);
 692        if (IS_ERR(inta->global_event)) {
 693                dev_err(dev, "Global event resource allocation failed\n");
 694                return PTR_ERR(inta->global_event);
 695        }
 696
 697        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 698        inta->base = devm_ioremap_resource(dev, res);
 699        if (IS_ERR(inta->base))
 700                return PTR_ERR(inta->base);
 701
 702        ret = ti_sci_inta_get_unmapped_sources(inta);
 703        if (ret)
 704                return ret;
 705
 706        domain = irq_domain_add_linear(dev_of_node(dev),
 707                                       ti_sci_get_num_resources(inta->vint),
 708                                       &ti_sci_inta_irq_domain_ops, inta);
 709        if (!domain) {
 710                dev_err(dev, "Failed to allocate IRQ domain\n");
 711                return -ENOMEM;
 712        }
 713
 714        msi_domain = ti_sci_inta_msi_create_irq_domain(of_node_to_fwnode(node),
 715                                                &ti_sci_inta_msi_domain_info,
 716                                                domain);
 717        if (!msi_domain) {
 718                irq_domain_remove(domain);
 719                dev_err(dev, "Failed to allocate msi domain\n");
 720                return -ENOMEM;
 721        }
 722
 723        INIT_LIST_HEAD(&inta->vint_list);
 724        mutex_init(&inta->vint_mutex);
 725
 726        dev_info(dev, "Interrupt Aggregator domain %d created\n", inta->ti_sci_id);
 727
 728        return 0;
 729}
 730
 731static const struct of_device_id ti_sci_inta_irq_domain_of_match[] = {
 732        { .compatible = "ti,sci-inta", },
 733        { /* sentinel */ },
 734};
 735MODULE_DEVICE_TABLE(of, ti_sci_inta_irq_domain_of_match);
 736
 737static struct platform_driver ti_sci_inta_irq_domain_driver = {
 738        .probe = ti_sci_inta_irq_domain_probe,
 739        .driver = {
 740                .name = "ti-sci-inta",
 741                .of_match_table = ti_sci_inta_irq_domain_of_match,
 742        },
 743};
 744module_platform_driver(ti_sci_inta_irq_domain_driver);
 745
 746MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ti.com>");
 747MODULE_DESCRIPTION("K3 Interrupt Aggregator driver over TI SCI protocol");
 748MODULE_LICENSE("GPL v2");
 749