OSCL-LXR linux-6.0.1/​drivers/​irqchip/​irq-ti-sci-inta.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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->msi_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;
     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);
     }
 
     inta->base = devm_platform_ioremap_resource(pdev, 0);
     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");

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