Merge tag 'powerpc-5.15-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...

[mirror_ubuntu-jammy-kernel.git] / drivers / irqchip / irq-ti-sci-inta.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments' K3 Interrupt Aggregator irqchip driver
 *
 * Copyright (C) 2018-2019 Texas Instruments Incorporated - https://www.ti.com/
 *      Lokesh Vutla <lokeshvutla@ti.com>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/msi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/soc/ti/ti_sci_inta_msi.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <asm-generic/msi.h>

#define TI_SCI_DEV_ID_MASK      0xffff
#define TI_SCI_DEV_ID_SHIFT     16
#define TI_SCI_IRQ_ID_MASK      0xffff
#define TI_SCI_IRQ_ID_SHIFT     0
#define HWIRQ_TO_DEVID(hwirq)   (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \
                                 (TI_SCI_DEV_ID_MASK))
#define HWIRQ_TO_IRQID(hwirq)   ((hwirq) & (TI_SCI_IRQ_ID_MASK))
#define TO_HWIRQ(dev, index)    ((((dev) & TI_SCI_DEV_ID_MASK) << \
                                 TI_SCI_DEV_ID_SHIFT) | \
                                ((index) & TI_SCI_IRQ_ID_MASK))

#define MAX_EVENTS_PER_VINT     64
#define VINT_ENABLE_SET_OFFSET  0x0
#define VINT_ENABLE_CLR_OFFSET  0x8
#define VINT_STATUS_OFFSET      0x18
#define VINT_STATUS_MASKED_OFFSET       0x20

/**
 * struct ti_sci_inta_event_desc - Description of an event coming to
 *                                 Interrupt Aggregator. This serves
 *                                 as a mapping table for global event,
 *                                 hwirq and vint bit.
 * @global_event:       Global event number corresponding to this event
 * @hwirq:              Hwirq of the incoming interrupt
 * @vint_bit:           Corresponding vint bit to which this event is attached.
 */
struct ti_sci_inta_event_desc {
        u16 global_event;
        u32 hwirq;
        u8 vint_bit;
};

/**
 * struct ti_sci_inta_vint_desc - Description of a virtual interrupt coming out
 *                                of Interrupt Aggregator.
 * @domain:             Pointer to IRQ domain to which this vint belongs.
 * @list:               List entry for the vint list
 * @event_map:          Bitmap to manage the allocation of events to vint.
 * @events:             Array of event descriptors assigned to this vint.
 * @parent_virq:        Linux IRQ number that gets attached to parent
 * @vint_id:            TISCI vint ID
 */
struct ti_sci_inta_vint_desc {
        struct irq_domain *domain;
        struct list_head list;
        DECLARE_BITMAP(event_map, MAX_EVENTS_PER_VINT);
        struct ti_sci_inta_event_desc events[MAX_EVENTS_PER_VINT];
        unsigned int parent_virq;
        u16 vint_id;
};

/**
 * struct ti_sci_inta_irq_domain - Structure representing a TISCI based
 *                                 Interrupt Aggregator IRQ domain.
 * @sci:                Pointer to TISCI handle
 * @vint:               TISCI resource pointer representing IA interrupts.
 * @global_event:       TISCI resource pointer representing global events.
 * @vint_list:          List of the vints active in the system
 * @vint_mutex:         Mutex to protect vint_list
 * @base:               Base address of the memory mapped IO registers
 * @pdev:               Pointer to platform device.
 * @ti_sci_id:          TI-SCI device identifier
 * @unmapped_cnt:       Number of @unmapped_dev_ids entries
 * @unmapped_dev_ids:   Pointer to an array of TI-SCI device identifiers of
 *                      unmapped event sources.
 *                      Unmapped Events are not part of the Global Event Map and
 *                      they are converted to Global event within INTA to be
 *                      received by the same INTA to generate an interrupt.
 *                      In case an interrupt request comes for a device which is
 *                      generating Unmapped Event, we must use the INTA's TI-SCI
 *                      device identifier in place of the source device
 *                      identifier to let sysfw know where it has to program the
 *                      Global Event number.
 */
struct ti_sci_inta_irq_domain {
        const struct ti_sci_handle *sci;
        struct ti_sci_resource *vint;
        struct ti_sci_resource *global_event;
        struct list_head vint_list;
        /* Mutex to protect vint list */
        struct mutex vint_mutex;
        void __iomem *base;
        struct platform_device *pdev;
        u32 ti_sci_id;

        int unmapped_cnt;
        u16 *unmapped_dev_ids;
};

#define to_vint_desc(e, i) container_of(e, struct ti_sci_inta_vint_desc, \
                                        events[i])

static u16 ti_sci_inta_get_dev_id(struct ti_sci_inta_irq_domain *inta, u32 hwirq)
{
        u16 dev_id = HWIRQ_TO_DEVID(hwirq);
        int i;

        if (inta->unmapped_cnt == 0)
                return dev_id;

        /*
         * For devices sending Unmapped Events we must use the INTA's TI-SCI
         * device identifier number to be able to convert it to a Global Event
         * and map it to an interrupt.
         */
        for (i = 0; i < inta->unmapped_cnt; i++) {
                if (dev_id == inta->unmapped_dev_ids[i]) {
                        dev_id = inta->ti_sci_id;
                        break;
                }
        }

        return dev_id;
}

/**
 * ti_sci_inta_irq_handler() - Chained IRQ handler for the vint irqs
 * @desc:       Pointer to irq_desc corresponding to the irq
 */
static void ti_sci_inta_irq_handler(struct irq_desc *desc)
{
        struct ti_sci_inta_vint_desc *vint_desc;
        struct ti_sci_inta_irq_domain *inta;
        struct irq_domain *domain;
        unsigned int bit;
        unsigned long val;

        vint_desc = irq_desc_get_handler_data(desc);
        domain = vint_desc->domain;
        inta = domain->host_data;

        chained_irq_enter(irq_desc_get_chip(desc), desc);

        val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 +
                            VINT_STATUS_MASKED_OFFSET);

        for_each_set_bit(bit, &val, MAX_EVENTS_PER_VINT)
                generic_handle_domain_irq(domain, vint_desc->events[bit].hwirq);

        chained_irq_exit(irq_desc_get_chip(desc), desc);
}

/**
 * ti_sci_inta_xlate_irq() - Translate hwirq to parent's hwirq.
 * @inta:       IRQ domain corresponding to Interrupt Aggregator
 * @irq:        Hardware irq corresponding to the above irq domain
 *
 * Return parent irq number if translation is available else -ENOENT.
 */
static int ti_sci_inta_xlate_irq(struct ti_sci_inta_irq_domain *inta,
                                 u16 vint_id)
{
        struct device_node *np = dev_of_node(&inta->pdev->dev);
        u32 base, parent_base, size;
        const __be32 *range;
        int len;

        range = of_get_property(np, "ti,interrupt-ranges", &len);
        if (!range)
                return vint_id;

        for (len /= sizeof(*range); len >= 3; len -= 3) {
                base = be32_to_cpu(*range++);
                parent_base = be32_to_cpu(*range++);
                size = be32_to_cpu(*range++);

                if (base <= vint_id && vint_id < base + size)
                        return vint_id - base + parent_base;
        }

        return -ENOENT;
}

/**
 * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator
 * @domain:     IRQ domain corresponding to Interrupt Aggregator
 *
 * Return 0 if all went well else corresponding error value.
 */
static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_domain *domain)
{
        struct ti_sci_inta_irq_domain *inta = domain->host_data;
        struct ti_sci_inta_vint_desc *vint_desc;
        struct irq_fwspec parent_fwspec;
        struct device_node *parent_node;
        unsigned int parent_virq;
        int p_hwirq, ret;
        u16 vint_id;

        vint_id = ti_sci_get_free_resource(inta->vint);
        if (vint_id == TI_SCI_RESOURCE_NULL)
                return ERR_PTR(-EINVAL);

        p_hwirq = ti_sci_inta_xlate_irq(inta, vint_id);
        if (p_hwirq < 0) {
                ret = p_hwirq;
                goto free_vint;
        }

        vint_desc = kzalloc(sizeof(*vint_desc), GFP_KERNEL);
        if (!vint_desc) {
                ret = -ENOMEM;
                goto free_vint;
        }

        vint_desc->domain = domain;
        vint_desc->vint_id = vint_id;
        INIT_LIST_HEAD(&vint_desc->list);

        parent_node = of_irq_find_parent(dev_of_node(&inta->pdev->dev));
        parent_fwspec.fwnode = of_node_to_fwnode(parent_node);

        if (of_device_is_compatible(parent_node, "arm,gic-v3")) {
                /* Parent is GIC */
                parent_fwspec.param_count = 3;
                parent_fwspec.param[0] = 0;
                parent_fwspec.param[1] = p_hwirq - 32;
                parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
        } else {
                /* Parent is Interrupt Router */
                parent_fwspec.param_count = 1;
                parent_fwspec.param[0] = p_hwirq;
        }

        parent_virq = irq_create_fwspec_mapping(&parent_fwspec);
        if (parent_virq == 0) {
                dev_err(&inta->pdev->dev, "Parent IRQ allocation failed\n");
                ret = -EINVAL;
                goto free_vint_desc;

        }
        vint_desc->parent_virq = parent_virq;

        list_add_tail(&vint_desc->list, &inta->vint_list);
        irq_set_chained_handler_and_data(vint_desc->parent_virq,
                                         ti_sci_inta_irq_handler, vint_desc);

        return vint_desc;
free_vint_desc:
        kfree(vint_desc);
free_vint:
        ti_sci_release_resource(inta->vint, vint_id);
        return ERR_PTR(ret);
}

/**
 * ti_sci_inta_alloc_event() - Attach an event to a IA vint.
 * @vint_desc:  Pointer to vint_desc to which the event gets attached
 * @free_bit:   Bit inside vint to which event gets attached
 * @hwirq:      hwirq of the input event
 *
 * Return event_desc pointer if all went ok else appropriate error value.
 */
static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_event(struct ti_sci_inta_vint_desc *vint_desc,
                                                              u16 free_bit,
                                                              u32 hwirq)
{
        struct ti_sci_inta_irq_domain *inta = vint_desc->domain->host_data;
        struct ti_sci_inta_event_desc *event_desc;
        u16 dev_id, dev_index;
        int err;

        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
        dev_index = HWIRQ_TO_IRQID(hwirq);

        event_desc = &vint_desc->events[free_bit];
        event_desc->hwirq = hwirq;
        event_desc->vint_bit = free_bit;
        event_desc->global_event = ti_sci_get_free_resource(inta->global_event);
        if (event_desc->global_event == TI_SCI_RESOURCE_NULL)
                return ERR_PTR(-EINVAL);

        err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci,
                                                      dev_id, dev_index,
                                                      inta->ti_sci_id,
                                                      vint_desc->vint_id,
                                                      event_desc->global_event,
                                                      free_bit);
        if (err)
                goto free_global_event;

        return event_desc;
free_global_event:
        ti_sci_release_resource(inta->global_event, event_desc->global_event);
        return ERR_PTR(err);
}

/**
 * ti_sci_inta_alloc_irq() -  Allocate an irq within INTA domain
 * @domain:     irq_domain pointer corresponding to INTA
 * @hwirq:      hwirq of the input event
 *
 * Note: Allocation happens in the following manner:
 *      - Find a free bit available in any of the vints available in the list.
 *      - If not found, allocate a vint from the vint pool
 *      - Attach the free bit to input hwirq.
 * Return event_desc if all went ok else appropriate error value.
 */
static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_irq(struct irq_domain *domain,
                                                            u32 hwirq)
{
        struct ti_sci_inta_irq_domain *inta = domain->host_data;
        struct ti_sci_inta_vint_desc *vint_desc = NULL;
        struct ti_sci_inta_event_desc *event_desc;
        u16 free_bit;

        mutex_lock(&inta->vint_mutex);
        list_for_each_entry(vint_desc, &inta->vint_list, list) {
                free_bit = find_first_zero_bit(vint_desc->event_map,
                                               MAX_EVENTS_PER_VINT);
                if (free_bit != MAX_EVENTS_PER_VINT) {
                        set_bit(free_bit, vint_desc->event_map);
                        goto alloc_event;
                }
        }

        /* No free bits available. Allocate a new vint */
        vint_desc = ti_sci_inta_alloc_parent_irq(domain);
        if (IS_ERR(vint_desc)) {
                event_desc = ERR_CAST(vint_desc);
                goto unlock;
        }

        free_bit = find_first_zero_bit(vint_desc->event_map,
                                       MAX_EVENTS_PER_VINT);
        set_bit(free_bit, vint_desc->event_map);

alloc_event:
        event_desc = ti_sci_inta_alloc_event(vint_desc, free_bit, hwirq);
        if (IS_ERR(event_desc))
                clear_bit(free_bit, vint_desc->event_map);

unlock:
        mutex_unlock(&inta->vint_mutex);
        return event_desc;
}

/**
 * ti_sci_inta_free_parent_irq() - Free a parent irq to INTA
 * @inta:       Pointer to inta domain.
 * @vint_desc:  Pointer to vint_desc that needs to be freed.
 */
static void ti_sci_inta_free_parent_irq(struct ti_sci_inta_irq_domain *inta,
                                        struct ti_sci_inta_vint_desc *vint_desc)
{
        if (find_first_bit(vint_desc->event_map, MAX_EVENTS_PER_VINT) == MAX_EVENTS_PER_VINT) {
                list_del(&vint_desc->list);
                ti_sci_release_resource(inta->vint, vint_desc->vint_id);
                irq_dispose_mapping(vint_desc->parent_virq);
                kfree(vint_desc);
        }
}

/**
 * ti_sci_inta_free_irq() - Free an IRQ within INTA domain
 * @event_desc: Pointer to event_desc that needs to be freed.
 * @hwirq:      Hwirq number within INTA domain that needs to be freed
 */
static void ti_sci_inta_free_irq(struct ti_sci_inta_event_desc *event_desc,
                                 u32 hwirq)
{
        struct ti_sci_inta_vint_desc *vint_desc;
        struct ti_sci_inta_irq_domain *inta;
        u16 dev_id;

        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
        inta = vint_desc->domain->host_data;
        dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
        /* free event irq */
        mutex_lock(&inta->vint_mutex);
        inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
                                                 dev_id, HWIRQ_TO_IRQID(hwirq),
                                                 inta->ti_sci_id,
                                                 vint_desc->vint_id,
                                                 event_desc->global_event,
                                                 event_desc->vint_bit);

        clear_bit(event_desc->vint_bit, vint_desc->event_map);
        ti_sci_release_resource(inta->global_event, event_desc->global_event);
        event_desc->global_event = TI_SCI_RESOURCE_NULL;
        event_desc->hwirq = 0;

        ti_sci_inta_free_parent_irq(inta, vint_desc);
        mutex_unlock(&inta->vint_mutex);
}

/**
 * ti_sci_inta_request_resources() - Allocate resources for input irq
 * @data: Pointer to corresponding irq_data
 *
 * Note: This is the core api where the actual allocation happens for input
 *       hwirq. This allocation involves creating a parent irq for vint.
 *       If this is done in irq_domain_ops.alloc() then a deadlock is reached
 *       for allocation. So this allocation is being done in request_resources()
 *
 * Return: 0 if all went well else corresponding error.
 */
static int ti_sci_inta_request_resources(struct irq_data *data)
{
        struct ti_sci_inta_event_desc *event_desc;

        event_desc = ti_sci_inta_alloc_irq(data->domain, data->hwirq);
        if (IS_ERR(event_desc))
                return PTR_ERR(event_desc);

        data->chip_data = event_desc;

        return 0;
}

/**
 * ti_sci_inta_release_resources - Release resources for input irq
 * @data: Pointer to corresponding irq_data
 *
 * Note: Corresponding to request_resources(), all the unmapping and deletion
 *       of parent vint irqs happens in this api.
 */
static void ti_sci_inta_release_resources(struct irq_data *data)
{
        struct ti_sci_inta_event_desc *event_desc;

        event_desc = irq_data_get_irq_chip_data(data);
        ti_sci_inta_free_irq(event_desc, data->hwirq);
}

/**
 * ti_sci_inta_manage_event() - Control the event based on the offset
 * @data:       Pointer to corresponding irq_data
 * @offset:     register offset using which event is controlled.
 */
static void ti_sci_inta_manage_event(struct irq_data *data, u32 offset)
{
        struct ti_sci_inta_event_desc *event_desc;
        struct ti_sci_inta_vint_desc *vint_desc;
        struct ti_sci_inta_irq_domain *inta;

        event_desc = irq_data_get_irq_chip_data(data);
        vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
        inta = data->domain->host_data;

        writeq_relaxed(BIT(event_desc->vint_bit),
                       inta->base + vint_desc->vint_id * 0x1000 + offset);
}

/**
 * ti_sci_inta_mask_irq() - Mask an event
 * @data:       Pointer to corresponding irq_data
 */
static void ti_sci_inta_mask_irq(struct irq_data *data)
{
        ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET);
}

/**
 * ti_sci_inta_unmask_irq() - Unmask an event
 * @data:       Pointer to corresponding irq_data
 */
static void ti_sci_inta_unmask_irq(struct irq_data *data)
{
        ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET);
}

/**
 * ti_sci_inta_ack_irq() - Ack an event
 * @data:       Pointer to corresponding irq_data
 */
static void ti_sci_inta_ack_irq(struct irq_data *data)
{
        /*
         * Do not clear the event if hardware is capable of sending
         * a down event.
         */
        if (irqd_get_trigger_type(data) != IRQF_TRIGGER_HIGH)
                ti_sci_inta_manage_event(data, VINT_STATUS_OFFSET);
}

static int ti_sci_inta_set_affinity(struct irq_data *d,
                                    const struct cpumask *mask_val, bool force)
{
        return -EINVAL;
}

/**
 * ti_sci_inta_set_type() - Update the trigger type of the irq.
 * @data:       Pointer to corresponding irq_data
 * @type:       Trigger type as specified by user
 *
 * Note: This updates the handle_irq callback for level msi.
 *
 * Return 0 if all went well else appropriate error.
 */
static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type)
{
        /*
         * .alloc default sets handle_edge_irq. But if the user specifies
         * that IRQ is level MSI, then update the handle to handle_level_irq
         */
        switch (type & IRQ_TYPE_SENSE_MASK) {
        case IRQF_TRIGGER_HIGH:
                irq_set_handler_locked(data, handle_level_irq);
                return 0;
        case IRQF_TRIGGER_RISING:
                return 0;
        default:
                return -EINVAL;
        }
}

static struct irq_chip ti_sci_inta_irq_chip = {
        .name                   = "INTA",
        .irq_ack                = ti_sci_inta_ack_irq,
        .irq_mask               = ti_sci_inta_mask_irq,
        .irq_set_type           = ti_sci_inta_set_type,
        .irq_unmask             = ti_sci_inta_unmask_irq,
        .irq_set_affinity       = ti_sci_inta_set_affinity,
        .irq_request_resources  = ti_sci_inta_request_resources,
        .irq_release_resources  = ti_sci_inta_release_resources,
};

/**
 * ti_sci_inta_irq_domain_free() - Free an IRQ from the IRQ domain
 * @domain:     Domain to which the irqs belong
 * @virq:       base linux virtual IRQ to be freed.
 * @nr_irqs:    Number of continuous irqs to be freed
 */
static void ti_sci_inta_irq_domain_free(struct irq_domain *domain,
                                        unsigned int virq, unsigned int nr_irqs)
{
        struct irq_data *data = irq_domain_get_irq_data(domain, virq);

        irq_domain_reset_irq_data(data);
}

/**
 * ti_sci_inta_irq_domain_alloc() - Allocate Interrupt aggregator IRQs
 * @domain:     Point to the interrupt aggregator IRQ domain
 * @virq:       Corresponding Linux virtual IRQ number
 * @nr_irqs:    Continuous irqs to be allocated
 * @data:       Pointer to firmware specifier
 *
 * No actual allocation happens here.
 *
 * Return 0 if all went well else appropriate error value.
 */
static int ti_sci_inta_irq_domain_alloc(struct irq_domain *domain,
                                        unsigned int virq, unsigned int nr_irqs,
                                        void *data)
{
        msi_alloc_info_t *arg = data;

        irq_domain_set_info(domain, virq, arg->hwirq, &ti_sci_inta_irq_chip,
                            NULL, handle_edge_irq, NULL, NULL);

        return 0;
}

static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = {
        .free           = ti_sci_inta_irq_domain_free,
        .alloc          = ti_sci_inta_irq_domain_alloc,
};

static struct irq_chip ti_sci_inta_msi_irq_chip = {
        .name                   = "MSI-INTA",
        .flags                  = IRQCHIP_SUPPORTS_LEVEL_MSI,
};

static void ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg,
                                     struct msi_desc *desc)
{
        struct platform_device *pdev = to_platform_device(desc->dev);

        arg->desc = desc;
        arg->hwirq = TO_HWIRQ(pdev->id, desc->inta.dev_index);
}

static struct msi_domain_ops ti_sci_inta_msi_ops = {
        .set_desc       = ti_sci_inta_msi_set_desc,
};

static struct msi_domain_info ti_sci_inta_msi_domain_info = {
        .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
                   MSI_FLAG_LEVEL_CAPABLE),
        .ops    = &ti_sci_inta_msi_ops,
        .chip   = &ti_sci_inta_msi_irq_chip,
};

static int ti_sci_inta_get_unmapped_sources(struct ti_sci_inta_irq_domain *inta)
{
        struct device *dev = &inta->pdev->dev;
        struct device_node *node = dev_of_node(dev);
        struct of_phandle_iterator it;
        int count, err, ret, i;

        count = of_count_phandle_with_args(node, "ti,unmapped-event-sources", NULL);
        if (count <= 0)
                return 0;

        inta->unmapped_dev_ids = devm_kcalloc(dev, count,
                                              sizeof(*inta->unmapped_dev_ids),
                                              GFP_KERNEL);
        if (!inta->unmapped_dev_ids)
                return -ENOMEM;

        i = 0;
        of_for_each_phandle(&it, err, node, "ti,unmapped-event-sources", NULL, 0) {
                u32 dev_id;

                ret = of_property_read_u32(it.node, "ti,sci-dev-id", &dev_id);
                if (ret) {
                        dev_err(dev, "ti,sci-dev-id read failure for %pOFf\n", it.node);
                        of_node_put(it.node);
                        return ret;
                }
                inta->unmapped_dev_ids[i++] = dev_id;
        }

        inta->unmapped_cnt = count;

        return 0;
}

static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
{
        struct irq_domain *parent_domain, *domain, *msi_domain;
        struct device_node *parent_node, *node;
        struct ti_sci_inta_irq_domain *inta;
        struct device *dev = &pdev->dev;
        struct resource *res;
        int ret;

        node = dev_of_node(dev);
        parent_node = of_irq_find_parent(node);
        if (!parent_node) {
                dev_err(dev, "Failed to get IRQ parent node\n");
                return -ENODEV;
        }

        parent_domain = irq_find_host(parent_node);
        if (!parent_domain)
                return -EPROBE_DEFER;

        inta = devm_kzalloc(dev, sizeof(*inta), GFP_KERNEL);
        if (!inta)
                return -ENOMEM;

        inta->pdev = pdev;
        inta->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
        if (IS_ERR(inta->sci))
                return dev_err_probe(dev, PTR_ERR(inta->sci),
                                     "ti,sci read fail\n");

        ret = of_property_read_u32(dev->of_node, "ti,sci-dev-id", &inta->ti_sci_id);
        if (ret) {
                dev_err(dev, "missing 'ti,sci-dev-id' property\n");
                return -EINVAL;
        }

        inta->vint = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
                                              TI_SCI_RESASG_SUBTYPE_IA_VINT);
        if (IS_ERR(inta->vint)) {
                dev_err(dev, "VINT resource allocation failed\n");
                return PTR_ERR(inta->vint);
        }

        inta->global_event = devm_ti_sci_get_resource(inta->sci, dev, inta->ti_sci_id,
                                                      TI_SCI_RESASG_SUBTYPE_GLOBAL_EVENT_SEVT);
        if (IS_ERR(inta->global_event)) {
                dev_err(dev, "Global event resource allocation failed\n");
                return PTR_ERR(inta->global_event);
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        inta->base = devm_ioremap_resource(dev, res);
        if (IS_ERR(inta->base))
                return PTR_ERR(inta->base);

        ret = ti_sci_inta_get_unmapped_sources(inta);
        if (ret)
                return ret;

        domain = irq_domain_add_linear(dev_of_node(dev),
                                       ti_sci_get_num_resources(inta->vint),
                                       &ti_sci_inta_irq_domain_ops, inta);
        if (!domain) {
                dev_err(dev, "Failed to allocate IRQ domain\n");
                return -ENOMEM;
        }

        msi_domain = ti_sci_inta_msi_create_irq_domain(of_node_to_fwnode(node),
                                                &ti_sci_inta_msi_domain_info,
                                                domain);
        if (!msi_domain) {
                irq_domain_remove(domain);
                dev_err(dev, "Failed to allocate msi domain\n");
                return -ENOMEM;
        }

        INIT_LIST_HEAD(&inta->vint_list);
        mutex_init(&inta->vint_mutex);

        dev_info(dev, "Interrupt Aggregator domain %d created\n", inta->ti_sci_id);

        return 0;
}

static const struct of_device_id ti_sci_inta_irq_domain_of_match[] = {
        { .compatible = "ti,sci-inta", },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ti_sci_inta_irq_domain_of_match);

static struct platform_driver ti_sci_inta_irq_domain_driver = {
        .probe = ti_sci_inta_irq_domain_probe,
        .driver = {
                .name = "ti-sci-inta",
                .of_match_table = ti_sci_inta_irq_domain_of_match,
        },
};
module_platform_driver(ti_sci_inta_irq_domain_driver);

MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ti.com>");
MODULE_DESCRIPTION("K3 Interrupt Aggregator driver over TI SCI protocol");
MODULE_LICENSE("GPL v2");