[linux-2.6-block.git] / drivers / irqchip / irq-ls-scfg-msi.c

/*
 * Freescale SCFG MSI(-X) support
 *
 * Copyright (C) 2016 Freescale Semiconductor.
 *
 * Author: Minghuan Lian <Minghuan.Lian@nxp.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
#include <linux/dma-iommu.h>

#define MSI_IRQS_PER_MSIR	32
#define MSI_MSIR_OFFSET		4

#define MSI_LS1043V1_1_IRQS_PER_MSIR	8
#define MSI_LS1043V1_1_MSIR_OFFSET	0x10

struct ls_scfg_msi_cfg {
	u32 ibs_shift; /* Shift of interrupt bit select */
	u32 msir_irqs; /* The irq number per MSIR */
	u32 msir_base; /* The base address of MSIR */
};

struct ls_scfg_msir {
	struct ls_scfg_msi *msi_data;
	unsigned int index;
	unsigned int gic_irq;
	unsigned int bit_start;
	unsigned int bit_end;
	unsigned int srs; /* Shared interrupt register select */
	void __iomem *reg;
};

struct ls_scfg_msi {
	spinlock_t		lock;
	struct platform_device	*pdev;
	struct irq_domain	*parent;
	struct irq_domain	*msi_domain;
	void __iomem		*regs;
	phys_addr_t		msiir_addr;
	struct ls_scfg_msi_cfg	*cfg;
	u32			msir_num;
	struct ls_scfg_msir	*msir;
	u32			irqs_num;
	unsigned long		*used;
};

static struct irq_chip ls_scfg_msi_irq_chip = {
	.name = "MSI",
	.irq_mask	= pci_msi_mask_irq,
	.irq_unmask	= pci_msi_unmask_irq,
};

static struct msi_domain_info ls_scfg_msi_domain_info = {
	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS |
		   MSI_FLAG_USE_DEF_CHIP_OPS |
		   MSI_FLAG_PCI_MSIX),
	.chip	= &ls_scfg_msi_irq_chip,
};

static int msi_affinity_flag = 1;

static int __init early_parse_ls_scfg_msi(char *p)
{
	if (p && strncmp(p, "no-affinity", 11) == 0)
		msi_affinity_flag = 0;
	else
		msi_affinity_flag = 1;

	return 0;
}
early_param("lsmsi", early_parse_ls_scfg_msi);

static void ls_scfg_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
{
	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(data);

	msg->address_hi = upper_32_bits(msi_data->msiir_addr);
	msg->address_lo = lower_32_bits(msi_data->msiir_addr);
	msg->data = data->hwirq;

	if (msi_affinity_flag) {
		const struct cpumask *mask;

		mask = irq_data_get_effective_affinity_mask(data);
		msg->data |= cpumask_first(mask);
	}

	iommu_dma_map_msi_msg(data->irq, msg);
}

static int ls_scfg_msi_set_affinity(struct irq_data *irq_data,
				    const struct cpumask *mask, bool force)
{
	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(irq_data);
	u32 cpu;

	if (!msi_affinity_flag)
		return -EINVAL;

	if (!force)
		cpu = cpumask_any_and(mask, cpu_online_mask);
	else
		cpu = cpumask_first(mask);

	if (cpu >= msi_data->msir_num)
		return -EINVAL;

	if (msi_data->msir[cpu].gic_irq <= 0) {
		pr_warn("cannot bind the irq to cpu%d\n", cpu);
		return -EINVAL;
	}

	irq_data_update_effective_affinity(irq_data, cpumask_of(cpu));

	return IRQ_SET_MASK_OK;
}

static struct irq_chip ls_scfg_msi_parent_chip = {
	.name			= "SCFG",
	.irq_compose_msi_msg	= ls_scfg_msi_compose_msg,
	.irq_set_affinity	= ls_scfg_msi_set_affinity,
};

static int ls_scfg_msi_domain_irq_alloc(struct irq_domain *domain,
					unsigned int virq,
					unsigned int nr_irqs,
					void *args)
{
	struct ls_scfg_msi *msi_data = domain->host_data;
	int pos, err = 0;

	WARN_ON(nr_irqs != 1);

	spin_lock(&msi_data->lock);
	pos = find_first_zero_bit(msi_data->used, msi_data->irqs_num);
	if (pos < msi_data->irqs_num)
		__set_bit(pos, msi_data->used);
	else
		err = -ENOSPC;
	spin_unlock(&msi_data->lock);

	if (err)
		return err;

	irq_domain_set_info(domain, virq, pos,
			    &ls_scfg_msi_parent_chip, msi_data,
			    handle_simple_irq, NULL, NULL);

	return 0;
}

static void ls_scfg_msi_domain_irq_free(struct irq_domain *domain,
				   unsigned int virq, unsigned int nr_irqs)
{
	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(d);
	int pos;

	pos = d->hwirq;
	if (pos < 0 || pos >= msi_data->irqs_num) {
		pr_err("failed to teardown msi. Invalid hwirq %d\n", pos);
		return;
	}

	spin_lock(&msi_data->lock);
	__clear_bit(pos, msi_data->used);
	spin_unlock(&msi_data->lock);
}

static const struct irq_domain_ops ls_scfg_msi_domain_ops = {
	.alloc	= ls_scfg_msi_domain_irq_alloc,
	.free	= ls_scfg_msi_domain_irq_free,
};

static void ls_scfg_msi_irq_handler(struct irq_desc *desc)
{
	struct ls_scfg_msir *msir = irq_desc_get_handler_data(desc);
	struct ls_scfg_msi *msi_data = msir->msi_data;
	unsigned long val;
	int pos, size, virq, hwirq;

	chained_irq_enter(irq_desc_get_chip(desc), desc);

	val = ioread32be(msir->reg);

	pos = msir->bit_start;
	size = msir->bit_end + 1;

	for_each_set_bit_from(pos, &val, size) {
		hwirq = ((msir->bit_end - pos) << msi_data->cfg->ibs_shift) |
			msir->srs;
		virq = irq_find_mapping(msi_data->parent, hwirq);
		if (virq)
			generic_handle_irq(virq);
	}

	chained_irq_exit(irq_desc_get_chip(desc), desc);
}

static int ls_scfg_msi_domains_init(struct ls_scfg_msi *msi_data)
{
	/* Initialize MSI domain parent */
	msi_data->parent = irq_domain_add_linear(NULL,
						 msi_data->irqs_num,
						 &ls_scfg_msi_domain_ops,
						 msi_data);
	if (!msi_data->parent) {
		dev_err(&msi_data->pdev->dev, "failed to create IRQ domain\n");
		return -ENOMEM;
	}

	msi_data->msi_domain = pci_msi_create_irq_domain(
				of_node_to_fwnode(msi_data->pdev->dev.of_node),
				&ls_scfg_msi_domain_info,
				msi_data->parent);
	if (!msi_data->msi_domain) {
		dev_err(&msi_data->pdev->dev, "failed to create MSI domain\n");
		irq_domain_remove(msi_data->parent);
		return -ENOMEM;
	}

	return 0;
}

static int ls_scfg_msi_setup_hwirq(struct ls_scfg_msi *msi_data, int index)
{
	struct ls_scfg_msir *msir;
	int virq, i, hwirq;

	virq = platform_get_irq(msi_data->pdev, index);
	if (virq <= 0)
		return -ENODEV;

	msir = &msi_data->msir[index];
	msir->index = index;
	msir->msi_data = msi_data;
	msir->gic_irq = virq;
	msir->reg = msi_data->regs + msi_data->cfg->msir_base + 4 * index;

	if (msi_data->cfg->msir_irqs == MSI_LS1043V1_1_IRQS_PER_MSIR) {
		msir->bit_start = 32 - ((msir->index + 1) *
				  MSI_LS1043V1_1_IRQS_PER_MSIR);
		msir->bit_end = msir->bit_start +
				MSI_LS1043V1_1_IRQS_PER_MSIR - 1;
	} else {
		msir->bit_start = 0;
		msir->bit_end = msi_data->cfg->msir_irqs - 1;
	}

	irq_set_chained_handler_and_data(msir->gic_irq,
					 ls_scfg_msi_irq_handler,
					 msir);

	if (msi_affinity_flag) {
		/* Associate MSIR interrupt to the cpu */
		irq_set_affinity(msir->gic_irq, get_cpu_mask(index));
		msir->srs = 0; /* This value is determined by the CPU */
	} else
		msir->srs = index;

	/* Release the hwirqs corresponding to this MSIR */
	if (!msi_affinity_flag || msir->index == 0) {
		for (i = 0; i < msi_data->cfg->msir_irqs; i++) {
			hwirq = i << msi_data->cfg->ibs_shift | msir->index;
			bitmap_clear(msi_data->used, hwirq, 1);
		}
	}

	return 0;
}

static int ls_scfg_msi_teardown_hwirq(struct ls_scfg_msir *msir)
{
	struct ls_scfg_msi *msi_data = msir->msi_data;
	int i, hwirq;

	if (msir->gic_irq > 0)
		irq_set_chained_handler_and_data(msir->gic_irq, NULL, NULL);

	for (i = 0; i < msi_data->cfg->msir_irqs; i++) {
		hwirq = i << msi_data->cfg->ibs_shift | msir->index;
		bitmap_set(msi_data->used, hwirq, 1);
	}

	return 0;
}

static struct ls_scfg_msi_cfg ls1021_msi_cfg = {
	.ibs_shift = 3,
	.msir_irqs = MSI_IRQS_PER_MSIR,
	.msir_base = MSI_MSIR_OFFSET,
};

static struct ls_scfg_msi_cfg ls1046_msi_cfg = {
	.ibs_shift = 2,
	.msir_irqs = MSI_IRQS_PER_MSIR,
	.msir_base = MSI_MSIR_OFFSET,
};

static struct ls_scfg_msi_cfg ls1043_v1_1_msi_cfg = {
	.ibs_shift = 2,
	.msir_irqs = MSI_LS1043V1_1_IRQS_PER_MSIR,
	.msir_base = MSI_LS1043V1_1_MSIR_OFFSET,
};

static const struct of_device_id ls_scfg_msi_id[] = {
	/* The following two misspelled compatibles are obsolete */
	{ .compatible = "fsl,1s1021a-msi", .data = &ls1021_msi_cfg},
	{ .compatible = "fsl,1s1043a-msi", .data = &ls1021_msi_cfg},

	{ .compatible = "fsl,ls1012a-msi", .data = &ls1021_msi_cfg },
	{ .compatible = "fsl,ls1021a-msi", .data = &ls1021_msi_cfg },
	{ .compatible = "fsl,ls1043a-msi", .data = &ls1021_msi_cfg },
	{ .compatible = "fsl,ls1043a-v1.1-msi", .data = &ls1043_v1_1_msi_cfg },
	{ .compatible = "fsl,ls1046a-msi", .data = &ls1046_msi_cfg },
	{},
};
MODULE_DEVICE_TABLE(of, ls_scfg_msi_id);

static int ls_scfg_msi_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	struct ls_scfg_msi *msi_data;
	struct resource *res;
	int i, ret;

	match = of_match_device(ls_scfg_msi_id, &pdev->dev);
	if (!match)
		return -ENODEV;

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

	msi_data->cfg = (struct ls_scfg_msi_cfg *) match->data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	msi_data->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(msi_data->regs)) {
		dev_err(&pdev->dev, "failed to initialize 'regs'\n");
		return PTR_ERR(msi_data->regs);
	}
	msi_data->msiir_addr = res->start;

	msi_data->pdev = pdev;
	spin_lock_init(&msi_data->lock);

	msi_data->irqs_num = MSI_IRQS_PER_MSIR *
			     (1 << msi_data->cfg->ibs_shift);
	msi_data->used = devm_kcalloc(&pdev->dev,
				    BITS_TO_LONGS(msi_data->irqs_num),
				    sizeof(*msi_data->used),
				    GFP_KERNEL);
	if (!msi_data->used)
		return -ENOMEM;
	/*
	 * Reserve all the hwirqs
	 * The available hwirqs will be released in ls1_msi_setup_hwirq()
	 */
	bitmap_set(msi_data->used, 0, msi_data->irqs_num);

	msi_data->msir_num = of_irq_count(pdev->dev.of_node);

	if (msi_affinity_flag) {
		u32 cpu_num;

		cpu_num = num_possible_cpus();
		if (msi_data->msir_num >= cpu_num)
			msi_data->msir_num = cpu_num;
		else
			msi_affinity_flag = 0;
	}

	msi_data->msir = devm_kcalloc(&pdev->dev, msi_data->msir_num,
				      sizeof(*msi_data->msir),
				      GFP_KERNEL);
	if (!msi_data->msir)
		return -ENOMEM;

	for (i = 0; i < msi_data->msir_num; i++)
		ls_scfg_msi_setup_hwirq(msi_data, i);

	ret = ls_scfg_msi_domains_init(msi_data);
	if (ret)
		return ret;

	platform_set_drvdata(pdev, msi_data);

	return 0;
}

static int ls_scfg_msi_remove(struct platform_device *pdev)
{
	struct ls_scfg_msi *msi_data = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < msi_data->msir_num; i++)
		ls_scfg_msi_teardown_hwirq(&msi_data->msir[i]);

	irq_domain_remove(msi_data->msi_domain);
	irq_domain_remove(msi_data->parent);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ls_scfg_msi_driver = {
	.driver = {
		.name = "ls-scfg-msi",
		.of_match_table = ls_scfg_msi_id,
	},
	.probe = ls_scfg_msi_probe,
	.remove = ls_scfg_msi_remove,
};

module_platform_driver(ls_scfg_msi_driver);

MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian@nxp.com>");
MODULE_DESCRIPTION("Freescale Layerscape SCFG MSI controller driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
b8f3ebe6 ML	1	/*
	2	* Freescale SCFG MSI(-X) support
	3	*
	4	* Copyright (C) 2016 Freescale Semiconductor.
	5	*
	6	* Author: Minghuan Lian <Minghuan.Lian@nxp.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/msi.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/irq.h>
	18	#include <linux/irqchip/chained_irq.h>
	19	#include <linux/irqdomain.h>
4dd5da65	20	#include <linux/of_irq.h>
b8f3ebe6 ML	21	#include <linux/of_pci.h>
	22	#include <linux/of_platform.h>
	23	#include <linux/spinlock.h>
0cdd431c	24	#include <linux/dma-iommu.h>
b8f3ebe6	25
4dd5da65 ML	26	#define MSI_IRQS_PER_MSIR 32
	27	#define MSI_MSIR_OFFSET 4
	28
fd100dab ML	29	#define MSI_LS1043V1_1_IRQS_PER_MSIR 8
	30	#define MSI_LS1043V1_1_MSIR_OFFSET 0x10
	31
4dd5da65 ML	32	struct ls_scfg_msi_cfg {
4dd5da65 ML	33	u32 ibs_shift; /* Shift of interrupt bit select */
fd100dab ML	34	u32 msir_irqs; /* The irq number per MSIR */
fd100dab ML	35	u32 msir_base; /* The base address of MSIR */
4dd5da65 ML	36	};
	37
	38	struct ls_scfg_msir {
	39	struct ls_scfg_msi *msi_data;
	40	unsigned int index;
	41	unsigned int gic_irq;
fd100dab ML	42	unsigned int bit_start;
fd100dab ML	43	unsigned int bit_end;
ae3efabf	44	unsigned int srs; /* Shared interrupt register select */
4dd5da65 ML	45	void __iomem *reg;
4dd5da65 ML	46	};
b8f3ebe6 ML	47
	48	struct ls_scfg_msi {
	49	spinlock_t lock;
	50	struct platform_device *pdev;
	51	struct irq_domain *parent;
	52	struct irq_domain *msi_domain;
	53	void __iomem *regs;
	54	phys_addr_t msiir_addr;
4dd5da65 ML	55	struct ls_scfg_msi_cfg *cfg;
	56	u32 msir_num;
	57	struct ls_scfg_msir *msir;
	58	u32 irqs_num;
	59	unsigned long *used;
b8f3ebe6 ML	60	};
	61
	62	static struct irq_chip ls_scfg_msi_irq_chip = {
	63	.name = "MSI",
	64	.irq_mask = pci_msi_mask_irq,
	65	.irq_unmask = pci_msi_unmask_irq,
	66	};
	67
	68	static struct msi_domain_info ls_scfg_msi_domain_info = {
	69	.flags = (MSI_FLAG_USE_DEF_DOM_OPS \|
	70	MSI_FLAG_USE_DEF_CHIP_OPS \|
	71	MSI_FLAG_PCI_MSIX),
	72	.chip = &ls_scfg_msi_irq_chip,
	73	};
	74
ae3efabf ML	75	static int msi_affinity_flag = 1;
	76
	77	static int __init early_parse_ls_scfg_msi(char *p)
	78	{
	79	if (p && strncmp(p, "no-affinity", 11) == 0)
	80	msi_affinity_flag = 0;
	81	else
	82	msi_affinity_flag = 1;
	83
	84	return 0;
	85	}
	86	early_param("lsmsi", early_parse_ls_scfg_msi);
	87
b8f3ebe6 ML	88	static void ls_scfg_msi_compose_msg(struct irq_data data, struct msi_msg msg)
	89	{
	90	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(data);
	91
	92	msg->address_hi = upper_32_bits(msi_data->msiir_addr);
	93	msg->address_lo = lower_32_bits(msi_data->msiir_addr);
4dd5da65	94	msg->data = data->hwirq;
ae3efabf	95
893fbfff MZ	96	if (msi_affinity_flag) {
	97	const struct cpumask *mask;
	98
	99	mask = irq_data_get_effective_affinity_mask(data);
	100	msg->data \|= cpumask_first(mask);
	101	}
0cdd431c LT	102
0cdd431c LT	103	iommu_dma_map_msi_msg(data->irq, msg);
b8f3ebe6 ML	104	}
	105
	106	static int ls_scfg_msi_set_affinity(struct irq_data *irq_data,
	107	const struct cpumask *mask, bool force)
	108	{
ae3efabf ML	109	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(irq_data);
	110	u32 cpu;
	111
	112	if (!msi_affinity_flag)
	113	return -EINVAL;
	114
	115	if (!force)
	116	cpu = cpumask_any_and(mask, cpu_online_mask);
	117	else
	118	cpu = cpumask_first(mask);
	119
	120	if (cpu >= msi_data->msir_num)
	121	return -EINVAL;
	122
	123	if (msi_data->msir[cpu].gic_irq <= 0) {
	124	pr_warn("cannot bind the irq to cpu%d\n", cpu);
	125	return -EINVAL;
	126	}
	127
893fbfff	128	irq_data_update_effective_affinity(irq_data, cpumask_of(cpu));
ae3efabf ML	129
ae3efabf ML	130	return IRQ_SET_MASK_OK;
b8f3ebe6 ML	131	}
	132
	133	static struct irq_chip ls_scfg_msi_parent_chip = {
	134	.name = "SCFG",
	135	.irq_compose_msi_msg = ls_scfg_msi_compose_msg,
	136	.irq_set_affinity = ls_scfg_msi_set_affinity,
	137	};
	138
	139	static int ls_scfg_msi_domain_irq_alloc(struct irq_domain *domain,
	140	unsigned int virq,
	141	unsigned int nr_irqs,
	142	void *args)
	143	{
	144	struct ls_scfg_msi *msi_data = domain->host_data;
	145	int pos, err = 0;
	146
	147	WARN_ON(nr_irqs != 1);
	148
	149	spin_lock(&msi_data->lock);
4dd5da65 ML	150	pos = find_first_zero_bit(msi_data->used, msi_data->irqs_num);
4dd5da65 ML	151	if (pos < msi_data->irqs_num)
b8f3ebe6 ML	152	__set_bit(pos, msi_data->used);
	153	else
	154	err = -ENOSPC;
	155	spin_unlock(&msi_data->lock);
	156
	157	if (err)
	158	return err;
	159
	160	irq_domain_set_info(domain, virq, pos,
	161	&ls_scfg_msi_parent_chip, msi_data,
	162	handle_simple_irq, NULL, NULL);
	163
	164	return 0;
	165	}
	166
	167	static void ls_scfg_msi_domain_irq_free(struct irq_domain *domain,
	168	unsigned int virq, unsigned int nr_irqs)
	169	{
	170	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
	171	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(d);
	172	int pos;
	173
	174	pos = d->hwirq;
4dd5da65	175	if (pos < 0 \|\| pos >= msi_data->irqs_num) {
b8f3ebe6 ML	176	pr_err("failed to teardown msi. Invalid hwirq %d\n", pos);
	177	return;
	178	}
	179
	180	spin_lock(&msi_data->lock);
	181	__clear_bit(pos, msi_data->used);
	182	spin_unlock(&msi_data->lock);
	183	}
	184
	185	static const struct irq_domain_ops ls_scfg_msi_domain_ops = {
	186	.alloc = ls_scfg_msi_domain_irq_alloc,
	187	.free = ls_scfg_msi_domain_irq_free,
	188	};
	189
	190	static void ls_scfg_msi_irq_handler(struct irq_desc *desc)
	191	{
4dd5da65 ML	192	struct ls_scfg_msir *msir = irq_desc_get_handler_data(desc);
4dd5da65 ML	193	struct ls_scfg_msi *msi_data = msir->msi_data;
b8f3ebe6	194	unsigned long val;
fd100dab	195	int pos, size, virq, hwirq;
b8f3ebe6 ML	196
	197	chained_irq_enter(irq_desc_get_chip(desc), desc);
	198
4dd5da65	199	val = ioread32be(msir->reg);
fd100dab ML	200
	201	pos = msir->bit_start;
	202	size = msir->bit_end + 1;
	203
	204	for_each_set_bit_from(pos, &val, size) {
	205	hwirq = ((msir->bit_end - pos) << msi_data->cfg->ibs_shift) \|
ae3efabf	206	msir->srs;
4dd5da65	207	virq = irq_find_mapping(msi_data->parent, hwirq);
b8f3ebe6 ML	208	if (virq)
	209	generic_handle_irq(virq);
	210	}
	211
	212	chained_irq_exit(irq_desc_get_chip(desc), desc);
	213	}
	214
	215	static int ls_scfg_msi_domains_init(struct ls_scfg_msi *msi_data)
	216	{
	217	/* Initialize MSI domain parent */
	218	msi_data->parent = irq_domain_add_linear(NULL,
4dd5da65	219	msi_data->irqs_num,
b8f3ebe6 ML	220	&ls_scfg_msi_domain_ops,
	221	msi_data);
	222	if (!msi_data->parent) {
	223	dev_err(&msi_data->pdev->dev, "failed to create IRQ domain\n");
	224	return -ENOMEM;
	225	}
	226
	227	msi_data->msi_domain = pci_msi_create_irq_domain(
	228	of_node_to_fwnode(msi_data->pdev->dev.of_node),
	229	&ls_scfg_msi_domain_info,
	230	msi_data->parent);
	231	if (!msi_data->msi_domain) {
	232	dev_err(&msi_data->pdev->dev, "failed to create MSI domain\n");
	233	irq_domain_remove(msi_data->parent);
	234	return -ENOMEM;
	235	}
	236
	237	return 0;
	238	}
	239
4dd5da65 ML	240	static int ls_scfg_msi_setup_hwirq(struct ls_scfg_msi *msi_data, int index)
	241	{
	242	struct ls_scfg_msir *msir;
	243	int virq, i, hwirq;
	244
	245	virq = platform_get_irq(msi_data->pdev, index);
	246	if (virq <= 0)
	247	return -ENODEV;
	248
	249	msir = &msi_data->msir[index];
	250	msir->index = index;
	251	msir->msi_data = msi_data;
	252	msir->gic_irq = virq;
fd100dab ML	253	msir->reg = msi_data->regs + msi_data->cfg->msir_base + 4 * index;
	254
	255	if (msi_data->cfg->msir_irqs == MSI_LS1043V1_1_IRQS_PER_MSIR) {
	256	msir->bit_start = 32 - ((msir->index + 1) *
	257	MSI_LS1043V1_1_IRQS_PER_MSIR);
	258	msir->bit_end = msir->bit_start +
	259	MSI_LS1043V1_1_IRQS_PER_MSIR - 1;
	260	} else {
	261	msir->bit_start = 0;
	262	msir->bit_end = msi_data->cfg->msir_irqs - 1;
	263	}
4dd5da65 ML	264
	265	irq_set_chained_handler_and_data(msir->gic_irq,
	266	ls_scfg_msi_irq_handler,
	267	msir);
	268
ae3efabf ML	269	if (msi_affinity_flag) {
	270	/* Associate MSIR interrupt to the cpu */
	271	irq_set_affinity(msir->gic_irq, get_cpu_mask(index));
	272	msir->srs = 0; /* This value is determined by the CPU */
	273	} else
	274	msir->srs = index;
	275
4dd5da65	276	/* Release the hwirqs corresponding to this MSIR */
ae3efabf ML	277	if (!msi_affinity_flag \|\| msir->index == 0) {
	278	for (i = 0; i < msi_data->cfg->msir_irqs; i++) {
	279	hwirq = i << msi_data->cfg->ibs_shift \| msir->index;
	280	bitmap_clear(msi_data->used, hwirq, 1);
	281	}
4dd5da65 ML	282	}
	283
	284	return 0;
	285	}
	286
	287	static int ls_scfg_msi_teardown_hwirq(struct ls_scfg_msir *msir)
	288	{
	289	struct ls_scfg_msi *msi_data = msir->msi_data;
	290	int i, hwirq;
	291
	292	if (msir->gic_irq > 0)
	293	irq_set_chained_handler_and_data(msir->gic_irq, NULL, NULL);
	294
fd100dab	295	for (i = 0; i < msi_data->cfg->msir_irqs; i++) {
4dd5da65 ML	296	hwirq = i << msi_data->cfg->ibs_shift \| msir->index;
	297	bitmap_set(msi_data->used, hwirq, 1);
	298	}
	299
	300	return 0;
	301	}
	302
	303	static struct ls_scfg_msi_cfg ls1021_msi_cfg = {
	304	.ibs_shift = 3,
fd100dab ML	305	.msir_irqs = MSI_IRQS_PER_MSIR,
fd100dab ML	306	.msir_base = MSI_MSIR_OFFSET,
4dd5da65 ML	307	};
	308
	309	static struct ls_scfg_msi_cfg ls1046_msi_cfg = {
	310	.ibs_shift = 2,
fd100dab ML	311	.msir_irqs = MSI_IRQS_PER_MSIR,
	312	.msir_base = MSI_MSIR_OFFSET,
	313	};
	314
	315	static struct ls_scfg_msi_cfg ls1043_v1_1_msi_cfg = {
	316	.ibs_shift = 2,
	317	.msir_irqs = MSI_LS1043V1_1_IRQS_PER_MSIR,
	318	.msir_base = MSI_LS1043V1_1_MSIR_OFFSET,
4dd5da65 ML	319	};
	320
	321	static const struct of_device_id ls_scfg_msi_id[] = {
	322	/* The following two misspelled compatibles are obsolete */
	323	{ .compatible = "fsl,1s1021a-msi", .data = &ls1021_msi_cfg},
	324	{ .compatible = "fsl,1s1043a-msi", .data = &ls1021_msi_cfg},
	325
68ace22e	326	{ .compatible = "fsl,ls1012a-msi", .data = &ls1021_msi_cfg },
4dd5da65 ML	327	{ .compatible = "fsl,ls1021a-msi", .data = &ls1021_msi_cfg },
4dd5da65 ML	328	{ .compatible = "fsl,ls1043a-msi", .data = &ls1021_msi_cfg },
fd100dab	329	{ .compatible = "fsl,ls1043a-v1.1-msi", .data = &ls1043_v1_1_msi_cfg },
4dd5da65 ML	330	{ .compatible = "fsl,ls1046a-msi", .data = &ls1046_msi_cfg },
	331	{},
	332	};
	333	MODULE_DEVICE_TABLE(of, ls_scfg_msi_id);
	334
b8f3ebe6 ML	335	static int ls_scfg_msi_probe(struct platform_device *pdev)
b8f3ebe6 ML	336	{
4dd5da65	337	const struct of_device_id *match;
b8f3ebe6 ML	338	struct ls_scfg_msi *msi_data;
b8f3ebe6 ML	339	struct resource *res;
4dd5da65 ML	340	int i, ret;
	341
	342	match = of_match_device(ls_scfg_msi_id, &pdev->dev);
	343	if (!match)
	344	return -ENODEV;
b8f3ebe6 ML	345
	346	msi_data = devm_kzalloc(&pdev->dev, sizeof(*msi_data), GFP_KERNEL);
	347	if (!msi_data)
	348	return -ENOMEM;
	349
4dd5da65 ML	350	msi_data->cfg = (struct ls_scfg_msi_cfg *) match->data;
4dd5da65 ML	351
b8f3ebe6 ML	352	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	353	msi_data->regs = devm_ioremap_resource(&pdev->dev, res);
	354	if (IS_ERR(msi_data->regs)) {
	355	dev_err(&pdev->dev, "failed to initialize 'regs'\n");
	356	return PTR_ERR(msi_data->regs);
	357	}
	358	msi_data->msiir_addr = res->start;
	359
b8f3ebe6 ML	360	msi_data->pdev = pdev;
	361	spin_lock_init(&msi_data->lock);
	362
4dd5da65 ML	363	msi_data->irqs_num = MSI_IRQS_PER_MSIR *
	364	(1 << msi_data->cfg->ibs_shift);
	365	msi_data->used = devm_kcalloc(&pdev->dev,
	366	BITS_TO_LONGS(msi_data->irqs_num),
	367	sizeof(*msi_data->used),
	368	GFP_KERNEL);
	369	if (!msi_data->used)
	370	return -ENOMEM;
	371	/*
	372	* Reserve all the hwirqs
	373	* The available hwirqs will be released in ls1_msi_setup_hwirq()
	374	*/
	375	bitmap_set(msi_data->used, 0, msi_data->irqs_num);
	376
	377	msi_data->msir_num = of_irq_count(pdev->dev.of_node);
ae3efabf ML	378
	379	if (msi_affinity_flag) {
	380	u32 cpu_num;
	381
	382	cpu_num = num_possible_cpus();
	383	if (msi_data->msir_num >= cpu_num)
	384	msi_data->msir_num = cpu_num;
	385	else
	386	msi_affinity_flag = 0;
	387	}
	388
4dd5da65 ML	389	msi_data->msir = devm_kcalloc(&pdev->dev, msi_data->msir_num,
	390	sizeof(*msi_data->msir),
	391	GFP_KERNEL);
	392	if (!msi_data->msir)
	393	return -ENOMEM;
	394
	395	for (i = 0; i < msi_data->msir_num; i++)
	396	ls_scfg_msi_setup_hwirq(msi_data, i);
	397
b8f3ebe6 ML	398	ret = ls_scfg_msi_domains_init(msi_data);
	399	if (ret)
	400	return ret;
	401
b8f3ebe6 ML	402	platform_set_drvdata(pdev, msi_data);
	403
	404	return 0;
	405	}
	406
	407	static int ls_scfg_msi_remove(struct platform_device *pdev)
	408	{
	409	struct ls_scfg_msi *msi_data = platform_get_drvdata(pdev);
4dd5da65	410	int i;
b8f3ebe6	411
4dd5da65 ML	412	for (i = 0; i < msi_data->msir_num; i++)
4dd5da65 ML	413	ls_scfg_msi_teardown_hwirq(&msi_data->msir[i]);
b8f3ebe6 ML	414
	415	irq_domain_remove(msi_data->msi_domain);
	416	irq_domain_remove(msi_data->parent);
	417
	418	platform_set_drvdata(pdev, NULL);
	419
	420	return 0;
	421	}
	422
b8f3ebe6 ML	423	static struct platform_driver ls_scfg_msi_driver = {
	424	.driver = {
	425	.name = "ls-scfg-msi",
	426	.of_match_table = ls_scfg_msi_id,
	427	},
	428	.probe = ls_scfg_msi_probe,
	429	.remove = ls_scfg_msi_remove,
	430	};
	431
	432	module_platform_driver(ls_scfg_msi_driver);
	433
	434	MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian@nxp.com>");
	435	MODULE_DESCRIPTION("Freescale Layerscape SCFG MSI controller driver");
	436	MODULE_LICENSE("GPL v2");