// 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 inerrupts.
   * @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 virq, 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) {
  		virq = irq_find_mapping(domain, vint_desc->events[bit].hwirq);
  		if (virq)
  			generic_handle_irq(virq);
  	}
  
  	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
  ");
  		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
  ", 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
  ");
  		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
  ");

  	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
  ");
  		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
  ");
  		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
  ");
  		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
  ");
  		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
  ");
  		return -ENOMEM;
  	}

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

  	dev_info(dev, "Interrupt Aggregator domain %d created
  ", 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");