drivers/irqchip/irq-mvebu-icu.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * Copyright (C) 2017 Marvell
  *
  * Hanna Hawa <hannah@marvell.com>
  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/jump_label.h>
 #include <linux/kernel.h>
 #include <linux/msi.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>

 #include "irq-msi-lib.h"

 #include <dt-bindings/interrupt-controller/mvebu-icu.h>

 /* ICU registers */
 #define ICU_SETSPI_NSR_AL	0x10
 #define ICU_SETSPI_NSR_AH	0x14
 #define ICU_CLRSPI_NSR_AL	0x18
 #define ICU_CLRSPI_NSR_AH	0x1c
 #define ICU_SET_SEI_AL		0x50
 #define ICU_SET_SEI_AH		0x54
 #define ICU_CLR_SEI_AL		0x58
 #define ICU_CLR_SEI_AH		0x5C
 #define ICU_INT_CFG(x)          (0x100 + 4 * (x))
 #define   ICU_INT_ENABLE	BIT(24)
 #define   ICU_IS_EDGE		BIT(28)
 #define   ICU_GROUP_SHIFT	29

 /* ICU definitions */
 #define ICU_MAX_IRQS		207
 #define ICU_SATA0_ICU_ID	109
 #define ICU_SATA1_ICU_ID	107

 struct mvebu_icu_subset_data {
 	unsigned int icu_group;
 	unsigned int offset_set_ah;
 	unsigned int offset_set_al;
 	unsigned int offset_clr_ah;
 	unsigned int offset_clr_al;
 };

 struct mvebu_icu {
 	void __iomem *base;
 	struct device *dev;
 };

 struct mvebu_icu_msi_data {
 	struct mvebu_icu *icu;
 	atomic_t initialized;
 	const struct mvebu_icu_subset_data *subset_data;
 };

 static DEFINE_STATIC_KEY_FALSE(legacy_bindings);

 static int mvebu_icu_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
 			       unsigned long *hwirq, unsigned int *type)
 {
 	unsigned int param_count = static_branch_unlikely(&legacy_bindings) ? 3 : 2;
 	struct mvebu_icu_msi_data *msi_data = d->host_data;
 	struct mvebu_icu *icu = msi_data->icu;

 	/* Check the count of the parameters in dt */
 	if (WARN_ON(fwspec->param_count != param_count)) {
 		dev_err(icu->dev, "wrong ICU parameter count %d\n",
 			fwspec->param_count);
 		return -EINVAL;
 	}

 	if (static_branch_unlikely(&legacy_bindings)) {
 		*hwirq = fwspec->param[1];
 		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 		if (fwspec->param[0] != ICU_GRP_NSR) {
 			dev_err(icu->dev, "wrong ICU group type %x\n",
 				fwspec->param[0]);
 			return -EINVAL;
 		}
 	} else {
 		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;

 		/*
 		 * The ICU receives level interrupts. While the NSR are also
 		 * level interrupts, SEI are edge interrupts. Force the type
 		 * here in this case. Please note that this makes the interrupt
 		 * handling unreliable.
 		 */
 		if (msi_data->subset_data->icu_group == ICU_GRP_SEI)
 			*type = IRQ_TYPE_EDGE_RISING;
 	}

 	if (*hwirq >= ICU_MAX_IRQS) {
 		dev_err(icu->dev, "invalid interrupt number %ld\n", *hwirq);
 		return -EINVAL;
 	}

 	return 0;
 }

 static void mvebu_icu_init(struct mvebu_icu *icu,
 			   struct mvebu_icu_msi_data *msi_data,
 			   struct msi_msg *msg)
 {
 	const struct mvebu_icu_subset_data *subset = msi_data->subset_data;

 	if (atomic_cmpxchg(&msi_data->initialized, false, true))
 		return;

 	/* Set 'SET' ICU SPI message address in AP */
 	writel_relaxed(msg[0].address_hi, icu->base + subset->offset_set_ah);
 	writel_relaxed(msg[0].address_lo, icu->base + subset->offset_set_al);

 	if (subset->icu_group != ICU_GRP_NSR)
 		return;

 	/* Set 'CLEAR' ICU SPI message address in AP (level-MSI only) */
 	writel_relaxed(msg[1].address_hi, icu->base + subset->offset_clr_ah);
 	writel_relaxed(msg[1].address_lo, icu->base + subset->offset_clr_al);
 }

 static int mvebu_icu_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
 			      unsigned int virq, irq_hw_number_t hwirq, msi_alloc_info_t *arg)
 {
 	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, info->chip_data);
 	return irq_set_irqchip_state(virq, IRQCHIP_STATE_PENDING, false);
 }

 static void mvebu_icu_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 {
 	arg->desc = desc;
 	arg->hwirq = (u32)desc->data.icookie.value;
 }

 static void mvebu_icu_write_msi_msg(struct irq_data *d, struct msi_msg *msg)
 {
 	struct mvebu_icu_msi_data *msi_data = d->chip_data;
 	unsigned int icu_group = msi_data->subset_data->icu_group;
 	struct msi_desc *desc = irq_data_get_msi_desc(d);
 	struct mvebu_icu *icu = msi_data->icu;
 	unsigned int type;
 	u32 icu_int;

 	if (msg->address_lo || msg->address_hi) {
 		/* One off initialization per domain */
 		mvebu_icu_init(icu, msi_data, msg);
 		/* Configure the ICU with irq number & type */
 		icu_int = msg->data | ICU_INT_ENABLE;
 		type = (unsigned int)(desc->data.icookie.value >> 32);
 		if (type & IRQ_TYPE_EDGE_RISING)
 			icu_int |= ICU_IS_EDGE;
 		icu_int |= icu_group << ICU_GROUP_SHIFT;
 	} else {
 		/* De-configure the ICU */
 		icu_int = 0;
 	}

 	writel_relaxed(icu_int, icu->base + ICU_INT_CFG(d->hwirq));

 	/*
 	 * The SATA unit has 2 ports, and a dedicated ICU entry per
 	 * port. The ahci sata driver supports only one irq interrupt
 	 * per SATA unit. To solve this conflict, we configure the 2
 	 * SATA wired interrupts in the south bridge into 1 GIC
 	 * interrupt in the north bridge. Even if only a single port
 	 * is enabled, if sata node is enabled, both interrupts are
 	 * configured (regardless of which port is actually in use).
 	 */
 	if (d->hwirq == ICU_SATA0_ICU_ID || d->hwirq == ICU_SATA1_ICU_ID) {
 		writel_relaxed(icu_int, icu->base + ICU_INT_CFG(ICU_SATA0_ICU_ID));
 		writel_relaxed(icu_int, icu->base + ICU_INT_CFG(ICU_SATA1_ICU_ID));
 	}
 }

 static const struct msi_domain_template mvebu_icu_nsr_msi_template = {
 	.chip = {
 		.name			= "ICU-NSR",
 		.irq_mask		= irq_chip_mask_parent,
 		.irq_unmask		= irq_chip_unmask_parent,
 		.irq_eoi		= irq_chip_eoi_parent,
 		.irq_set_type		= irq_chip_set_type_parent,
 		.irq_write_msi_msg	= mvebu_icu_write_msi_msg,
 		.flags			= IRQCHIP_SUPPORTS_LEVEL_MSI,
 	},

 	.ops = {
 		.msi_translate		= mvebu_icu_translate,
 		.msi_init		= mvebu_icu_msi_init,
 		.set_desc		= mvebu_icu_set_desc,
 	},

 	.info = {
 		.bus_token		= DOMAIN_BUS_WIRED_TO_MSI,
 		.flags			= MSI_FLAG_LEVEL_CAPABLE |
 					  MSI_FLAG_USE_DEV_FWNODE,
 	},
 };

 static const struct msi_domain_template mvebu_icu_sei_msi_template = {
 	.chip = {
 		.name			= "ICU-SEI",
 		.irq_mask		= irq_chip_mask_parent,
 		.irq_unmask		= irq_chip_unmask_parent,
 		.irq_ack		= irq_chip_ack_parent,
 		.irq_set_type		= irq_chip_set_type_parent,
 		.irq_write_msi_msg	= mvebu_icu_write_msi_msg,
 		.flags			= IRQCHIP_SUPPORTS_LEVEL_MSI,
 	},

 	.ops = {
 		.msi_translate		= mvebu_icu_translate,
 		.msi_init		= mvebu_icu_msi_init,
 		.set_desc		= mvebu_icu_set_desc,
 	},

 	.info = {
 		.bus_token		= DOMAIN_BUS_WIRED_TO_MSI,
 		.flags			= MSI_FLAG_LEVEL_CAPABLE |
 					  MSI_FLAG_USE_DEV_FWNODE,
 	},
 };

 static const struct mvebu_icu_subset_data mvebu_icu_nsr_subset_data = {
 	.icu_group = ICU_GRP_NSR,
 	.offset_set_ah = ICU_SETSPI_NSR_AH,
 	.offset_set_al = ICU_SETSPI_NSR_AL,
 	.offset_clr_ah = ICU_CLRSPI_NSR_AH,
 	.offset_clr_al = ICU_CLRSPI_NSR_AL,
 };

 static const struct mvebu_icu_subset_data mvebu_icu_sei_subset_data = {
 	.icu_group = ICU_GRP_SEI,
 	.offset_set_ah = ICU_SET_SEI_AH,
 	.offset_set_al = ICU_SET_SEI_AL,
 };

 static const struct of_device_id mvebu_icu_subset_of_match[] = {
 	{
 		.compatible = "marvell,cp110-icu-nsr",
 		.data = &mvebu_icu_nsr_subset_data,
 	},
 	{
 		.compatible = "marvell,cp110-icu-sei",
 		.data = &mvebu_icu_sei_subset_data,
 	},
 	{},
 };

 static int mvebu_icu_subset_probe(struct platform_device *pdev)
 {
 	const struct msi_domain_template *tmpl;
 	struct mvebu_icu_msi_data *msi_data;
 	struct device *dev = &pdev->dev;
 	bool sei;

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

 	if (static_branch_unlikely(&legacy_bindings)) {
 		msi_data->icu = dev_get_drvdata(dev);
 		msi_data->subset_data = &mvebu_icu_nsr_subset_data;
 	} else {
 		msi_data->icu = dev_get_drvdata(dev->parent);
 		msi_data->subset_data = of_device_get_match_data(dev);
 	}

 	dev->msi.domain = of_msi_get_domain(dev, dev->of_node, DOMAIN_BUS_PLATFORM_MSI);
 	if (!dev->msi.domain)
 		return -EPROBE_DEFER;

 	if (!irq_domain_get_of_node(dev->msi.domain))
 		return -ENODEV;

 	sei = msi_data->subset_data->icu_group == ICU_GRP_SEI;
 	tmpl = sei ? &mvebu_icu_sei_msi_template : &mvebu_icu_nsr_msi_template;

 	if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, tmpl,
 					  ICU_MAX_IRQS, NULL, msi_data)) {
 		dev_err(dev, "Failed to create ICU MSI domain\n");
 		return -ENOMEM;
 	}

 	return 0;
 }

 static struct platform_driver mvebu_icu_subset_driver = {
 	.probe  = mvebu_icu_subset_probe,
 	.driver = {
 		.name = "mvebu-icu-subset",
 		.of_match_table = mvebu_icu_subset_of_match,
 	},
 };
 builtin_platform_driver(mvebu_icu_subset_driver);

 static int mvebu_icu_probe(struct platform_device *pdev)
 {
 	struct mvebu_icu *icu;
 	int i;

 	icu = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_icu),
 			   GFP_KERNEL);
 	if (!icu)
 		return -ENOMEM;

 	icu->dev = &pdev->dev;

 	icu->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(icu->base))
 		return PTR_ERR(icu->base);

 	/*
 	 * Legacy bindings: ICU is one node with one MSI parent: force manually
 	 *                  the probe of the NSR interrupts side.
 	 * New bindings: ICU node has children, one per interrupt controller
 	 *               having its own MSI parent: call platform_populate().
 	 * All ICU instances should use the same bindings.
 	 */
 	if (!of_get_child_count(pdev->dev.of_node))
 		static_branch_enable(&legacy_bindings);

 	/*
 	 * Clean all ICU interrupts of type NSR and SEI, required to
 	 * avoid unpredictable SPI assignments done by firmware.
 	 */
 	for (i = 0 ; i < ICU_MAX_IRQS ; i++) {
 		u32 icu_int, icu_grp;

 		icu_int = readl_relaxed(icu->base + ICU_INT_CFG(i));
 		icu_grp = icu_int >> ICU_GROUP_SHIFT;

 		if (icu_grp == ICU_GRP_NSR ||
 		    (icu_grp == ICU_GRP_SEI &&
 		     !static_branch_unlikely(&legacy_bindings)))
 			writel_relaxed(0x0, icu->base + ICU_INT_CFG(i));
 	}

 	platform_set_drvdata(pdev, icu);

 	if (static_branch_unlikely(&legacy_bindings))
 		return mvebu_icu_subset_probe(pdev);
 	else
 		return devm_of_platform_populate(&pdev->dev);
 }

 static const struct of_device_id mvebu_icu_of_match[] = {
 	{ .compatible = "marvell,cp110-icu", },
 	{},
 };

 static struct platform_driver mvebu_icu_driver = {
 	.probe  = mvebu_icu_probe,
 	.driver = {
 		.name = "mvebu-icu",
 		.of_match_table = mvebu_icu_of_match,
 	},
 };
 builtin_platform_driver(mvebu_icu_driver);
	/*
	* Copyright (C) 2017 Marvell
	*
	* Hanna Hawa <hannah@marvell.com>
	* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/irqchip.h>
	#include <linux/irqdomain.h>
	#include <linux/jump_label.h>
	#include <linux/kernel.h>
	#include <linux/msi.h>
	#include <linux/of_irq.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>

	#include "irq-msi-lib.h"

	#include <dt-bindings/interrupt-controller/mvebu-icu.h>

	/* ICU registers */
	#define ICU_SETSPI_NSR_AL 0x10
	#define ICU_SETSPI_NSR_AH 0x14
	#define ICU_CLRSPI_NSR_AL 0x18
	#define ICU_CLRSPI_NSR_AH 0x1c
	#define ICU_SET_SEI_AL 0x50
	#define ICU_SET_SEI_AH 0x54
	#define ICU_CLR_SEI_AL 0x58
	#define ICU_CLR_SEI_AH 0x5C
	#define ICU_INT_CFG(x) (0x100 + 4 * (x))
	#define ICU_INT_ENABLE BIT(24)
	#define ICU_IS_EDGE BIT(28)
	#define ICU_GROUP_SHIFT 29

	/* ICU definitions */
	#define ICU_MAX_IRQS 207
	#define ICU_SATA0_ICU_ID 109
	#define ICU_SATA1_ICU_ID 107

	struct mvebu_icu_subset_data {
	unsigned int icu_group;
	unsigned int offset_set_ah;
	unsigned int offset_set_al;
	unsigned int offset_clr_ah;
	unsigned int offset_clr_al;
	};

	struct mvebu_icu {
	void __iomem *base;
	struct device *dev;
	};

	struct mvebu_icu_msi_data {
	struct mvebu_icu *icu;
	atomic_t initialized;
	const struct mvebu_icu_subset_data *subset_data;
	};

	static DEFINE_STATIC_KEY_FALSE(legacy_bindings);

	static int mvebu_icu_translate(struct irq_domain d, struct irq_fwspec fwspec,
	unsigned long hwirq, unsigned int type)
	{
	unsigned int param_count = static_branch_unlikely(&legacy_bindings) ? 3 : 2;
	struct mvebu_icu_msi_data *msi_data = d->host_data;
	struct mvebu_icu *icu = msi_data->icu;

	/* Check the count of the parameters in dt */
	if (WARN_ON(fwspec->param_count != param_count)) {
	dev_err(icu->dev, "wrong ICU parameter count %d\n",
	fwspec->param_count);
	return -EINVAL;
	}

	if (static_branch_unlikely(&legacy_bindings)) {
	*hwirq = fwspec->param[1];
	*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
	if (fwspec->param[0] != ICU_GRP_NSR) {
	dev_err(icu->dev, "wrong ICU group type %x\n",
	fwspec->param[0]);
	return -EINVAL;
	}
	} else {
	*hwirq = fwspec->param[0];
	*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;

	/*
	* The ICU receives level interrupts. While the NSR are also
	* level interrupts, SEI are edge interrupts. Force the type
	* here in this case. Please note that this makes the interrupt
	* handling unreliable.
	*/
	if (msi_data->subset_data->icu_group == ICU_GRP_SEI)
	*type = IRQ_TYPE_EDGE_RISING;
	}

	if (*hwirq >= ICU_MAX_IRQS) {
	dev_err(icu->dev, "invalid interrupt number %ld\n", *hwirq);
	return -EINVAL;
	}

	return 0;
	}

	static void mvebu_icu_init(struct mvebu_icu *icu,
	struct mvebu_icu_msi_data *msi_data,
	struct msi_msg *msg)
	{
	const struct mvebu_icu_subset_data *subset = msi_data->subset_data;

	if (atomic_cmpxchg(&msi_data->initialized, false, true))
	return;

	/* Set 'SET' ICU SPI message address in AP */
	writel_relaxed(msg[0].address_hi, icu->base + subset->offset_set_ah);
	writel_relaxed(msg[0].address_lo, icu->base + subset->offset_set_al);

	if (subset->icu_group != ICU_GRP_NSR)
	return;

	/* Set 'CLEAR' ICU SPI message address in AP (level-MSI only) */
	writel_relaxed(msg[1].address_hi, icu->base + subset->offset_clr_ah);
	writel_relaxed(msg[1].address_lo, icu->base + subset->offset_clr_al);
	}

	static int mvebu_icu_msi_init(struct irq_domain domain, struct msi_domain_info info,
	unsigned int virq, irq_hw_number_t hwirq, msi_alloc_info_t *arg)
	{
	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, info->chip_data);
	return irq_set_irqchip_state(virq, IRQCHIP_STATE_PENDING, false);
	}

	static void mvebu_icu_set_desc(msi_alloc_info_t arg, struct msi_desc desc)
	{
	arg->desc = desc;
	arg->hwirq = (u32)desc->data.icookie.value;
	}

	static void mvebu_icu_write_msi_msg(struct irq_data d, struct msi_msg msg)
	{
	struct mvebu_icu_msi_data *msi_data = d->chip_data;
	unsigned int icu_group = msi_data->subset_data->icu_group;
	struct msi_desc *desc = irq_data_get_msi_desc(d);
	struct mvebu_icu *icu = msi_data->icu;
	unsigned int type;
	u32 icu_int;

	if (msg->address_lo \|\| msg->address_hi) {
	/* One off initialization per domain */
	mvebu_icu_init(icu, msi_data, msg);
	/* Configure the ICU with irq number & type */
	icu_int = msg->data \| ICU_INT_ENABLE;
	type = (unsigned int)(desc->data.icookie.value >> 32);
	if (type & IRQ_TYPE_EDGE_RISING)
	icu_int \|= ICU_IS_EDGE;
	icu_int \|= icu_group << ICU_GROUP_SHIFT;
	} else {
	/* De-configure the ICU */
	icu_int = 0;
	}

	writel_relaxed(icu_int, icu->base + ICU_INT_CFG(d->hwirq));

	/*
	* The SATA unit has 2 ports, and a dedicated ICU entry per
	* port. The ahci sata driver supports only one irq interrupt
	* per SATA unit. To solve this conflict, we configure the 2
	* SATA wired interrupts in the south bridge into 1 GIC
	* interrupt in the north bridge. Even if only a single port
	* is enabled, if sata node is enabled, both interrupts are
	* configured (regardless of which port is actually in use).
	*/
	if (d->hwirq == ICU_SATA0_ICU_ID \|\| d->hwirq == ICU_SATA1_ICU_ID) {
	writel_relaxed(icu_int, icu->base + ICU_INT_CFG(ICU_SATA0_ICU_ID));
	writel_relaxed(icu_int, icu->base + ICU_INT_CFG(ICU_SATA1_ICU_ID));
	}
	}

	static const struct msi_domain_template mvebu_icu_nsr_msi_template = {
	.chip = {
	.name = "ICU-NSR",
	.irq_mask = irq_chip_mask_parent,
	.irq_unmask = irq_chip_unmask_parent,
	.irq_eoi = irq_chip_eoi_parent,
	.irq_set_type = irq_chip_set_type_parent,
	.irq_write_msi_msg = mvebu_icu_write_msi_msg,
	.flags = IRQCHIP_SUPPORTS_LEVEL_MSI,
	},

	.ops = {
	.msi_translate = mvebu_icu_translate,
	.msi_init = mvebu_icu_msi_init,
	.set_desc = mvebu_icu_set_desc,
	},

	.info = {
	.bus_token = DOMAIN_BUS_WIRED_TO_MSI,
	.flags = MSI_FLAG_LEVEL_CAPABLE \|
	MSI_FLAG_USE_DEV_FWNODE,
	},
	};

	static const struct msi_domain_template mvebu_icu_sei_msi_template = {
	.chip = {
	.name = "ICU-SEI",
	.irq_mask = irq_chip_mask_parent,
	.irq_unmask = irq_chip_unmask_parent,
	.irq_ack = irq_chip_ack_parent,
	.irq_set_type = irq_chip_set_type_parent,
	.irq_write_msi_msg = mvebu_icu_write_msi_msg,
	.flags = IRQCHIP_SUPPORTS_LEVEL_MSI,
	},

	.ops = {
	.msi_translate = mvebu_icu_translate,
	.msi_init = mvebu_icu_msi_init,
	.set_desc = mvebu_icu_set_desc,
	},

	.info = {
	.bus_token = DOMAIN_BUS_WIRED_TO_MSI,
	.flags = MSI_FLAG_LEVEL_CAPABLE \|
	MSI_FLAG_USE_DEV_FWNODE,
	},
	};

	static const struct mvebu_icu_subset_data mvebu_icu_nsr_subset_data = {
	.icu_group = ICU_GRP_NSR,
	.offset_set_ah = ICU_SETSPI_NSR_AH,
	.offset_set_al = ICU_SETSPI_NSR_AL,
	.offset_clr_ah = ICU_CLRSPI_NSR_AH,
	.offset_clr_al = ICU_CLRSPI_NSR_AL,
	};

	static const struct mvebu_icu_subset_data mvebu_icu_sei_subset_data = {
	.icu_group = ICU_GRP_SEI,
	.offset_set_ah = ICU_SET_SEI_AH,
	.offset_set_al = ICU_SET_SEI_AL,
	};

	static const struct of_device_id mvebu_icu_subset_of_match[] = {
	{
	.compatible = "marvell,cp110-icu-nsr",
	.data = &mvebu_icu_nsr_subset_data,
	},
	{
	.compatible = "marvell,cp110-icu-sei",
	.data = &mvebu_icu_sei_subset_data,
	},
	{},
	};

	static int mvebu_icu_subset_probe(struct platform_device *pdev)
	{
	const struct msi_domain_template *tmpl;
	struct mvebu_icu_msi_data *msi_data;
	struct device *dev = &pdev->dev;
	bool sei;

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

	if (static_branch_unlikely(&legacy_bindings)) {
	msi_data->icu = dev_get_drvdata(dev);
	msi_data->subset_data = &mvebu_icu_nsr_subset_data;
	} else {
	msi_data->icu = dev_get_drvdata(dev->parent);
	msi_data->subset_data = of_device_get_match_data(dev);
	}

	dev->msi.domain = of_msi_get_domain(dev, dev->of_node, DOMAIN_BUS_PLATFORM_MSI);
	if (!dev->msi.domain)
	return -EPROBE_DEFER;

	if (!irq_domain_get_of_node(dev->msi.domain))
	return -ENODEV;

	sei = msi_data->subset_data->icu_group == ICU_GRP_SEI;
	tmpl = sei ? &mvebu_icu_sei_msi_template : &mvebu_icu_nsr_msi_template;

	if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, tmpl,
	ICU_MAX_IRQS, NULL, msi_data)) {
	dev_err(dev, "Failed to create ICU MSI domain\n");
	return -ENOMEM;
	}

	return 0;
	}

	static struct platform_driver mvebu_icu_subset_driver = {
	.probe = mvebu_icu_subset_probe,
	.driver = {
	.name = "mvebu-icu-subset",
	.of_match_table = mvebu_icu_subset_of_match,
	},
	};
	builtin_platform_driver(mvebu_icu_subset_driver);

	static int mvebu_icu_probe(struct platform_device *pdev)
	{
	struct mvebu_icu *icu;
	int i;

	icu = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_icu),
	GFP_KERNEL);
	if (!icu)
	return -ENOMEM;

	icu->dev = &pdev->dev;

	icu->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(icu->base))
	return PTR_ERR(icu->base);

	/*
	* Legacy bindings: ICU is one node with one MSI parent: force manually
	* the probe of the NSR interrupts side.
	* New bindings: ICU node has children, one per interrupt controller
	* having its own MSI parent: call platform_populate().
	* All ICU instances should use the same bindings.
	*/
	if (!of_get_child_count(pdev->dev.of_node))
	static_branch_enable(&legacy_bindings);

	/*
	* Clean all ICU interrupts of type NSR and SEI, required to
	* avoid unpredictable SPI assignments done by firmware.
	*/
	for (i = 0 ; i < ICU_MAX_IRQS ; i++) {
	u32 icu_int, icu_grp;

	icu_int = readl_relaxed(icu->base + ICU_INT_CFG(i));
	icu_grp = icu_int >> ICU_GROUP_SHIFT;

	if (icu_grp == ICU_GRP_NSR \|\|
	(icu_grp == ICU_GRP_SEI &&
	!static_branch_unlikely(&legacy_bindings)))
	writel_relaxed(0x0, icu->base + ICU_INT_CFG(i));
	}

	platform_set_drvdata(pdev, icu);

	if (static_branch_unlikely(&legacy_bindings))
	return mvebu_icu_subset_probe(pdev);
	else
	return devm_of_platform_populate(&pdev->dev);
	}

	static const struct of_device_id mvebu_icu_of_match[] = {
	{ .compatible = "marvell,cp110-icu", },
	{},
	};

	static struct platform_driver mvebu_icu_driver = {
	.probe = mvebu_icu_probe,
	.driver = {
	.name = "mvebu-icu",
	.of_match_table = mvebu_icu_of_match,
	},
	};
	builtin_platform_driver(mvebu_icu_driver);