Message-Id: <20250424-gicv5-host-v2-21-545edcaf012b@kernel.org>
Date: Thu, 24 Apr 2025 12:25:32 +0200
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, 
 Sascha Bischoff <sascha.bischoff@....com>, 
 Timothy Hayes <timothy.hayes@....com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Mark Rutland <mark.rutland@....com>, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: [PATCH v2 21/22] irqchip/gic-v5: Add GICv5 IWB support

The GICv5 architecture implements the Interrupt Wire Bridge (IWB) in
order to support wired interrupts that cannot be connected directly
to an IRS and instead uses the ITS to translate a wire event into
an IRQ signal.

An IWB is a special ITS device with its own deviceID; upon probe,
an IWB calls into the ITS driver to allocate DT/ITT tables for its
events (ie wires).

An IWB is always associated with a single ITS in the system.

An IWB is connected to an ITS and it has its own deviceID for all
interrupt wires that it manages; the IWB input wire number is
exposed to the ITS as an eventID. This eventID is not programmable
and therefore requires special handling in the ITS driver.

Add an IWB driver in order to:

- Probe IWBs in the system and allocate ITS tables
- Manage IWB IRQ domains
- Handle IWB input wires state (enable/disable)
- Add the required IWB IRQchip representation
- Handle firmware representation to Linux IRQ translation

Co-developed-by: Sascha Bischoff <sascha.bischoff@....com>
Signed-off-by: Sascha Bischoff <sascha.bischoff@....com>
Co-developed-by: Timothy Hayes <timothy.hayes@....com>
Signed-off-by: Timothy Hayes <timothy.hayes@....com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/Makefile         |   2 +-
 drivers/irqchip/irq-gic-v5-its.c |  68 ++++++--
 drivers/irqchip/irq-gic-v5-iwb.c | 356 +++++++++++++++++++++++++++++++++++++++
 drivers/irqchip/irq-gic-v5.c     |   2 +
 drivers/irqchip/irq-gic-v5.h     |  28 +++
 5 files changed, 437 insertions(+), 19 deletions(-)

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 4280395e3bdff7858102f0b4eaaea1121cace52f..7bfb2369fbe494a64b72308d95ae33de93c6b8c6 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -37,7 +37,7 @@ obj-$(CONFIG_ARM_GIC_V3_ITS)		+= irq-gic-v3-its.o irq-gic-v4.o
 obj-$(CONFIG_ARM_GIC_V3_ITS_FSL_MC)	+= irq-gic-v3-its-fsl-mc-msi.o
 obj-$(CONFIG_PARTITION_PERCPU)		+= irq-partition-percpu.o
 obj-$(CONFIG_ARM_GIC_V5)		+= irq-gic-v5.o irq-gic-v5-irs.o
-obj-$(CONFIG_ARM_GIC_V5_ITS)		+= irq-gic-v5-its.o
+obj-$(CONFIG_ARM_GIC_V5_ITS)		+= irq-gic-v5-its.o irq-gic-v5-iwb.o
 obj-$(CONFIG_HISILICON_IRQ_MBIGEN)	+= irq-mbigen.o
 obj-$(CONFIG_ARM_NVIC)			+= irq-nvic.o
 obj-$(CONFIG_ARM_VIC)			+= irq-vic.o
diff --git a/drivers/irqchip/irq-gic-v5-its.c b/drivers/irqchip/irq-gic-v5-its.c
index da349b4709cc5ec8978859237838f039389ca4a1..b5eb4dbfe2296dc6620889eb9291b542cae4aeb6 100644
--- a/drivers/irqchip/irq-gic-v5-its.c
+++ b/drivers/irqchip/irq-gic-v5-its.c
@@ -786,9 +786,8 @@ static struct gicv5_its_dev *gicv5_its_find_device(struct gicv5_its_chip_data *i
 	return dev ? dev : ERR_PTR(-ENODEV);
 }
 
-static struct gicv5_its_dev *gicv5_its_alloc_device(
-				struct gicv5_its_chip_data *its, int nvec,
-				u32 dev_id)
+struct gicv5_its_dev *gicv5_its_alloc_device(struct gicv5_its_chip_data *its,
+					     int nvec, u32 dev_id, bool is_iwb)
 {
 	struct gicv5_its_dev *its_dev;
 	int ret;
@@ -815,6 +814,7 @@ static struct gicv5_its_dev *gicv5_its_alloc_device(
 	its_dev->device_id = dev_id;
 	its_dev->num_events = nvec;
 	its_dev->num_mapped_events = 0;
+	its_dev->is_iwb = is_iwb;
 
 	ret = gicv5_its_device_register(its, its_dev);
 	if (ret) {
@@ -827,9 +827,11 @@ static struct gicv5_its_dev *gicv5_its_alloc_device(
 
 	/*
 	 * This is the first time we have seen this device. Hence, it is not
-	 * shared.
+	 * shared, unless it is an IWB that is a shared ITS device by
+	 * definition, its eventids are hardcoded and never change - we allocate
+	 * it once for all and never free it.
 	 */
-	its_dev->shared = false;
+	its_dev->shared = is_iwb;
 
 	its_dev->its_node = its;
 
@@ -859,7 +861,7 @@ static int gicv5_its_msi_prepare(struct irq_domain *domain, struct device *dev,
 
 	guard(mutex)(&its->dev_alloc_lock);
 
-	its_dev = gicv5_its_alloc_device(its, nvec, dev_id);
+	its_dev = gicv5_its_alloc_device(its, nvec, dev_id, false);
 	if (IS_ERR(its_dev))
 		return PTR_ERR(its_dev);
 
@@ -937,28 +939,55 @@ static void gicv5_its_free_event(struct gicv5_its_dev *its_dev, u16 event_id)
 }
 
 static int gicv5_its_alloc_eventid(struct gicv5_its_dev *its_dev,
+				   msi_alloc_info_t *info,
 				   unsigned int nr_irqs, u32 *eventid)
 {
-	int ret;
+	int event_id_base;
 
-	ret = bitmap_find_free_region(its_dev->event_map,
-				      its_dev->num_events,
-				      get_count_order(nr_irqs));
+	if (!its_dev->is_iwb) {
 
-	if (ret < 0)
-		return ret;
+		event_id_base = bitmap_find_free_region(
+			its_dev->event_map, its_dev->num_events,
+			get_count_order(nr_irqs));
+		if (event_id_base < 0)
+			return event_id_base;
+	} else {
+		/*
+		 * We want to have a fixed EventID mapped for the IWB.
+		 */
+		if (WARN(nr_irqs != 1, "IWB requesting nr_irqs != 1\n"))
+			return -EINVAL;
 
-	*eventid = ret;
+		event_id_base = info->scratchpad[1].ul;
+
+		if (event_id_base >= its_dev->num_events) {
+			pr_err("EventID ouside of ITT range; cannot allocate an ITT entry!\n");
+
+			return -EINVAL;
+		}
+
+		if (test_and_set_bit(event_id_base, its_dev->event_map)) {
+			pr_warn("Can't reserve event_id bitmap\n");
+			return -EINVAL;
+
+		}
+	}
+
+	*eventid = event_id_base;
 
 	return 0;
+
 }
 
 static void gicv5_its_free_eventid(struct gicv5_its_dev *its_dev,
 				   u32 event_id_base,
 				   unsigned int nr_irqs)
 {
-	bitmap_release_region(its_dev->event_map, event_id_base,
+	if (!its_dev->is_iwb)
+		bitmap_release_region(its_dev->event_map, event_id_base,
 				      get_count_order(nr_irqs));
+	else
+		clear_bit(event_id_base, its_dev->event_map);
 }
 
 static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
@@ -986,7 +1015,7 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 		return PTR_ERR(its_dev);
 	}
 
-	ret = gicv5_its_alloc_eventid(its_dev, nr_irqs, &event_id_base);
+	ret = gicv5_its_alloc_eventid(its_dev, info, nr_irqs, &event_id_base);
 	if (ret) {
 		mutex_unlock(&its->dev_alloc_lock);
 		return ret;
@@ -994,9 +1023,12 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 
 	mutex_unlock(&its->dev_alloc_lock);
 
-	ret = iommu_dma_prepare_msi(info->desc, its->its_trans_phys_base);
-	if (ret)
-		goto out_eventid;
+	/* IWBs are never upstream an IOMMU */
+	if (!its_dev->is_iwb) {
+		ret = iommu_dma_prepare_msi(info->desc, its->its_trans_phys_base);
+		if (ret)
+			goto out_eventid;
+	}
 
 	for (i = 0; i < nr_irqs; i++) {
 		lpi = gicv5_alloc_lpi();
diff --git a/drivers/irqchip/irq-gic-v5-iwb.c b/drivers/irqchip/irq-gic-v5-iwb.c
new file mode 100644
index 0000000000000000000000000000000000000000..a0ff1467f15e6f5cf969ada3309775fdc6a67d2b
--- /dev/null
+++ b/drivers/irqchip/irq-gic-v5-iwb.c
@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024-2025 ARM Limited, All Rights Reserved.
+ */
+#define pr_fmt(fmt)	"GICv5 IWB: " fmt
+
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/kernel.h>
+#include <linux/msi.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "irq-gic-v5.h"
+
+static u32 iwb_readl_relaxed(struct gicv5_iwb_chip_data *iwb_node,
+			     const u64 reg_offset)
+{
+	return readl_relaxed(iwb_node->iwb_base + reg_offset);
+}
+
+static void iwb_writel_relaxed(struct gicv5_iwb_chip_data *iwb_node,
+			       const u32 val, const u64 reg_offset)
+{
+	writel_relaxed(val, iwb_node->iwb_base + reg_offset);
+}
+
+static int gicv5_iwb_wait_for_wenabler(struct gicv5_iwb_chip_data *iwb_node)
+{
+	int ret;
+
+	ret = gicv5_wait_for_op(iwb_node->iwb_base, GICV5_IWB_WENABLE_STATUSR,
+				GICV5_IWB_WENABLE_STATUSR_IDLE, NULL);
+	if (unlikely(ret == -ETIMEDOUT))
+		pr_err_ratelimited("IWB_WENABLE_STATUSR timeout\n");
+
+	return ret;
+}
+
+static int __gicv5_iwb_set_wire_enable(struct gicv5_iwb_chip_data *iwb_node,
+				       u32 iwb_wire, bool enable)
+{
+	u32 n = iwb_wire / 32;
+	u8 i = iwb_wire % 32;
+	u32 val;
+
+	if (n >= iwb_node->nr_regs) {
+		pr_err("IWB_WENABLER<n> is invalid for n=%u\n", n);
+		return -EINVAL;
+	}
+
+	/*
+	 * Enable IWB wire/pin at this point
+	 * Note: This is not the same as enabling the interrupt
+	 */
+	val = iwb_readl_relaxed(iwb_node, GICV5_IWB_WENABLER + (4 * n));
+	if (enable)
+		val |= BIT(i);
+	else
+		val &= ~BIT(i);
+	iwb_writel_relaxed(iwb_node, val, GICV5_IWB_WENABLER + (4 * n));
+
+	return gicv5_iwb_wait_for_wenabler(iwb_node);
+}
+
+static int gicv5_iwb_enable_wire(struct gicv5_iwb_chip_data *iwb_node,
+				 u32 iwb_wire)
+{
+	return __gicv5_iwb_set_wire_enable(iwb_node, iwb_wire, true);
+}
+
+static int gicv5_iwb_disable_wire(struct gicv5_iwb_chip_data *iwb_node,
+				  u32 iwb_wire)
+{
+	return __gicv5_iwb_set_wire_enable(iwb_node, iwb_wire, false);
+}
+
+static int gicv5_iwb_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gicv5_iwb_chip_data *iwb_node = irq_data_get_irq_chip_data(d);
+	u32 iwb_wire, n, wtmr;
+	u8 i;
+
+	iwb_wire = d->hwirq;
+
+	i = iwb_wire % 32;
+	n = iwb_wire / 32;
+
+	if (n >= iwb_node->nr_regs) {
+		pr_err_once("reg %u out of range\n", n);
+		return -EINVAL;
+	}
+
+	wtmr = iwb_readl_relaxed(iwb_node, GICV5_IWB_WTMR + (4 * n));
+
+	switch (type) {
+	case IRQ_TYPE_LEVEL_HIGH:
+	case IRQ_TYPE_LEVEL_LOW:
+		wtmr |= BIT(i);
+		break;
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_EDGE_FALLING:
+		wtmr &= ~BIT(i);
+		break;
+	default:
+		pr_debug("unexpected wire trigger mode");
+		return -EINVAL;
+	}
+
+	iwb_writel_relaxed(iwb_node, wtmr, GICV5_IWB_WTMR + (4 * n));
+
+	return 0;
+}
+
+static const struct irq_chip gicv5_iwb_chip = {
+	.name			= "GICv5-IWB",
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_eoi		= irq_chip_eoi_parent,
+	.irq_set_type		= gicv5_iwb_set_type,
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+	.irq_get_irqchip_state	= irq_chip_get_parent_state,
+	.irq_set_irqchip_state	= irq_chip_set_parent_state,
+	.flags			= IRQCHIP_SET_TYPE_MASKED |
+				  IRQCHIP_SKIP_SET_WAKE |
+				  IRQCHIP_MASK_ON_SUSPEND
+};
+
+static int gicv5_iwb_irq_domain_translate(struct irq_domain *d,
+					  struct irq_fwspec *fwspec,
+					  irq_hw_number_t *hwirq,
+					  unsigned int *type)
+{
+	if (!is_of_node(fwspec->fwnode))
+		return -EINVAL;
+
+	if (fwspec->param_count < 2)
+		return -EINVAL;
+
+	/*
+	 * param[0] is be the wire
+	 * param[1] is the interrupt type
+	 */
+	*hwirq = fwspec->param[0];
+	*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+	return 0;
+}
+
+static void gicv5_iwb_irq_domain_free(struct irq_domain *domain,
+				      unsigned int virq, unsigned int nr_irqs)
+{
+	/* Free the local data, and then go up the hierarchy doing the same */
+	struct gicv5_iwb_chip_data *iwb_node = domain->host_data;
+	struct irq_data *data;
+
+	if (WARN_ON_ONCE(nr_irqs != 1))
+		return;
+
+	data = irq_domain_get_irq_data(domain, virq);
+	gicv5_iwb_disable_wire(iwb_node, data->hwirq);
+
+	irq_domain_reset_irq_data(data);
+
+	irq_domain_free_irqs_parent(domain, virq, nr_irqs);
+}
+
+/*
+ * Our parent is the ITS, which expects MSI devices with programmable
+ * event IDs. IWB event IDs are hardcoded.
+ *
+ * Use the msi_alloc_info_t structure to convey both our DeviceID
+ * (scratchpad[0]), and the wire that we are attempting to map to an LPI in
+ * the ITT (scratchpad[1]).
+ */
+static int iwb_alloc_lpi_irq_parent(struct irq_domain *domain,
+				    unsigned int virq, irq_hw_number_t hwirq)
+{
+	struct gicv5_iwb_chip_data *iwb_node = domain->host_data;
+	msi_alloc_info_t info;
+
+	info.scratchpad[0].ul = iwb_node->device_id;
+	info.scratchpad[1].ul = hwirq;
+	info.hwirq = hwirq;
+
+	return irq_domain_alloc_irqs_parent(domain, virq, 1, &info);
+}
+
+static int gicv5_iwb_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				      unsigned int nr_irqs, void *arg)
+{
+	struct gicv5_iwb_chip_data *iwb_node;
+	unsigned int type = IRQ_TYPE_NONE;
+	struct irq_fwspec *fwspec = arg;
+	irq_hw_number_t hwirq;
+	struct irq_data *irqd;
+	int ret;
+
+	if (WARN_ON_ONCE(nr_irqs != 1))
+		return -EINVAL;
+
+	ret = gicv5_iwb_irq_domain_translate(domain, fwspec, &hwirq, &type);
+	if (ret)
+		return ret;
+
+	if (iwb_alloc_lpi_irq_parent(domain, virq, hwirq))
+		return -EINVAL;
+
+	irqd = irq_get_irq_data(virq);
+	iwb_node = domain->host_data;
+
+	gicv5_iwb_enable_wire(iwb_node, hwirq);
+
+	irq_domain_set_info(domain, virq, hwirq, &gicv5_iwb_chip, iwb_node,
+			    handle_fasteoi_irq, NULL, NULL);
+	irq_set_probe(virq);
+	irqd_set_single_target(irqd);
+
+	return 0;
+}
+
+static const struct irq_domain_ops gicv5_iwb_irq_domain_ops = {
+	.translate	= gicv5_iwb_irq_domain_translate,
+	.alloc		= gicv5_iwb_irq_domain_alloc,
+	.free		= gicv5_iwb_irq_domain_free,
+};
+
+static struct gicv5_iwb_chip_data *
+__init gicv5_iwb_init_bases(void __iomem *iwb_base,
+			    struct fwnode_handle *handle,
+			    struct irq_domain *parent_domain, u32 device_id)
+{
+	struct gicv5_iwb_chip_data *iwb_node;
+	struct msi_domain_info *msi_info;
+	struct gicv5_its_chip_data *its;
+	struct gicv5_its_dev *its_dev;
+	u32 nr_wires, idr0, cr0;
+	int ret;
+
+	msi_info = msi_get_domain_info(parent_domain);
+	its = msi_info->data;
+	if (!its) {
+		pr_warn("IWB %pOF can't find parent ITS, bailing\n",
+			to_of_node(handle));
+		return ERR_PTR(-ENODEV);
+	}
+
+	iwb_node = kzalloc(sizeof(*iwb_node), GFP_KERNEL);
+	if (!iwb_node)
+		return ERR_PTR(-ENOMEM);
+
+	iwb_node->iwb_base = iwb_base;
+	iwb_node->device_id = device_id;
+
+	idr0 = iwb_readl_relaxed(iwb_node, GICV5_IWB_IDR0);
+	nr_wires = (FIELD_GET(GICV5_IWB_IDR0_IW_RANGE, idr0) + 1) * 32;
+
+	iwb_node->domain = irq_domain_create_hierarchy(parent_domain, 0,
+			   nr_wires, handle, &gicv5_iwb_irq_domain_ops,
+			   iwb_node);
+	irq_domain_update_bus_token(iwb_node->domain, DOMAIN_BUS_WIRED);
+
+	cr0 = iwb_readl_relaxed(iwb_node, GICV5_IWB_CR0);
+	if (!FIELD_GET(GICV5_IWB_CR0_IWBEN, cr0)) {
+		pr_err("IWB %s must be enabled in firmware\n",
+		       fwnode_get_name(handle));
+		ret = -EINVAL;
+		goto out_free;
+	}
+
+	iwb_node->nr_regs = FIELD_GET(GICV5_IWB_IDR0_IW_RANGE, idr0) + 1;
+
+	for (unsigned int n = 0; n < iwb_node->nr_regs; n++)
+		iwb_writel_relaxed(iwb_node, 0, GICV5_IWB_WENABLER + (sizeof(u32) * n));
+
+	ret = gicv5_iwb_wait_for_wenabler(iwb_node);
+	if (ret)
+		goto out_free;
+
+	mutex_lock(&its->dev_alloc_lock);
+	its_dev = gicv5_its_alloc_device(its, roundup_pow_of_two(nr_wires),
+					 device_id, true);
+	mutex_unlock(&its->dev_alloc_lock);
+	if (IS_ERR(its_dev)) {
+		ret = -ENODEV;
+		goto out_free;
+	}
+
+	return iwb_node;
+out_free:
+	irq_domain_remove(iwb_node->domain);
+	kfree(iwb_node);
+
+	return ERR_PTR(ret);
+}
+
+static int __init gicv5_iwb_of_init(struct device_node *node)
+{
+	struct gicv5_iwb_chip_data *iwb_node;
+	struct irq_domain *parent_domain;
+	struct device_node *parent_its;
+	struct of_phandle_args args;
+	void __iomem *iwb_base;
+	u32 device_id;
+	int ret;
+
+	iwb_base = of_io_request_and_map(node, 0, "IWB");
+	if (IS_ERR(iwb_base)) {
+		pr_err("%pOF: unable to map GICv5 IWB registers\n", node);
+		return PTR_ERR(iwb_base);
+	}
+
+	ret = of_parse_phandle_with_args(node, "msi-parent", "#msi-cells", 0,
+					 &args);
+	if (ret) {
+		pr_err("%pOF: Can't retrieve deviceID\n", node);
+		goto out_unmap;
+	}
+
+	parent_its = args.np;
+	parent_domain = irq_find_matching_host(parent_its, DOMAIN_BUS_NEXUS);
+	if (!parent_domain) {
+		pr_err("Unable to find the parent ITS domain for %pOF!\n", node);
+		ret = -ENXIO;
+		goto out_put;
+	}
+
+	device_id = args.args[0];
+	pr_debug("IWB deviceID: 0x%x\n", device_id);
+
+	iwb_node = gicv5_iwb_init_bases(iwb_base, &node->fwnode, parent_domain,
+					device_id);
+	if (IS_ERR(iwb_node)) {
+		ret = PTR_ERR(iwb_node);
+		goto out_put;
+	}
+
+	return 0;
+out_put:
+	of_node_put(parent_its);
+out_unmap:
+	iounmap(iwb_base);
+	return ret;
+}
+
+void __init gicv5_iwb_of_probe(void)
+{
+	struct device_node *np;
+	int ret;
+
+	for_each_compatible_node(np, NULL, "arm,gic-v5-iwb") {
+		ret = gicv5_iwb_of_init(np);
+		if (ret)
+			pr_err("Failed to init IWB %s\n", np->full_name);
+	}
+}
diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c
index e483d0774936035b5cf2407da9a65d776bad3138..0eaf1f40073d2659b60b3fa5ac06c66a9e4f2e2f 100644
--- a/drivers/irqchip/irq-gic-v5.c
+++ b/drivers/irqchip/irq-gic-v5.c
@@ -1047,6 +1047,8 @@ static int __init gicv5_of_init(struct device_node *node,
 
 	gicv5_irs_its_probe();
 
+	gicv5_iwb_of_probe();
+
 	return 0;
 out_int:
 	gicv5_cpu_disable_interrupts();
diff --git a/drivers/irqchip/irq-gic-v5.h b/drivers/irqchip/irq-gic-v5.h
index f5a453599493020b36d9c7f18c08171c51ba8669..a71504cbee2d08c8ff54fb409be72373945bc65a 100644
--- a/drivers/irqchip/irq-gic-v5.h
+++ b/drivers/irqchip/irq-gic-v5.h
@@ -238,6 +238,20 @@
 #define GICV5_ITS_HWIRQ_DEVICE_ID		GENMASK_ULL(31, 0)
 #define GICV5_ITS_HWIRQ_EVENT_ID		GENMASK_ULL(63, 32)
 
+#define GICV5_IWB_IDR0				0x0000
+#define GICV5_IWB_CR0				0x0080
+#define GICV5_IWB_WENABLE_STATUSR		0x00c0
+#define GICV5_IWB_WENABLER			0x2000
+#define GICV5_IWB_WTMR				0x4000
+
+#define GICV5_IWB_IDR0_INT_DOMS			GENMASK(14, 11)
+#define GICV5_IWB_IDR0_IW_RANGE			GENMASK(10, 0)
+
+#define GICV5_IWB_CR0_IDLE			BIT(1)
+#define GICV5_IWB_CR0_IWBEN			BIT(0)
+
+#define GICV5_IWB_WENABLE_STATUSR_IDLE		BIT(0)
+
 struct gicv5_chip_data {
 	struct fwnode_handle	*fwnode;
 	struct irq_domain	*ppi_domain;
@@ -348,6 +362,7 @@ struct gicv5_its_dev {
 	u32				num_events;
 	u32				num_mapped_events;
 	bool				shared;
+	bool				is_iwb;
 };
 
 void gicv5_init_lpis(u32 max);
@@ -357,4 +372,17 @@ int gicv5_alloc_lpi(void);
 void gicv5_free_lpi(u32 lpi);
 
 void __init gicv5_its_of_probe(struct device_node *parent);
+struct gicv5_its_dev *gicv5_its_alloc_device(struct gicv5_its_chip_data *its,
+					     int nvec, u32 dev_id, bool is_iwb);
+
+struct gicv5_iwb_chip_data {
+	void __iomem		*iwb_base;
+	struct irq_domain	*domain;
+	u64			flags;
+	u32			device_id;
+	u16			nr_regs;
+};
+
+void gicv5_iwb_of_probe(void);
+
 #endif

-- 
2.48.0

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