[linux.git] / drivers / irqchip / irq-gic-v3-its-fsl-mc-msi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Freescale Management Complex (MC) bus driver MSI support
 *
 * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
 * Author: German Rivera <[email protected]>
 *
 */

#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/fsl/mc.h>

static struct irq_chip its_msi_irq_chip = {
	.name = "ITS-fMSI",
	.irq_mask = irq_chip_mask_parent,
	.irq_unmask = irq_chip_unmask_parent,
	.irq_eoi = irq_chip_eoi_parent,
	.irq_set_affinity = msi_domain_set_affinity
};

static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
				  struct device *dev,
				  int nvec, msi_alloc_info_t *info)
{
	struct fsl_mc_device *mc_bus_dev;
	struct msi_domain_info *msi_info;

	if (!dev_is_fsl_mc(dev))
		return -EINVAL;

	mc_bus_dev = to_fsl_mc_device(dev);
	if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
		return -EINVAL;

	/*
	 * Set the device Id to be passed to the GIC-ITS:
	 *
	 * NOTE: This device id corresponds to the IOMMU stream ID
	 * associated with the DPRC object (ICID).
	 */
	info->scratchpad[0].ul = mc_bus_dev->icid;
	msi_info = msi_get_domain_info(msi_domain->parent);

	/* Allocate at least 32 MSIs, and always as a power of 2 */
	nvec = max_t(int, 32, roundup_pow_of_two(nvec));
	return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
}

static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
	.msi_prepare = its_fsl_mc_msi_prepare,
};

static struct msi_domain_info its_fsl_mc_msi_domain_info = {
	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
	.ops	= &its_fsl_mc_msi_ops,
	.chip	= &its_msi_irq_chip,
};

static const struct of_device_id its_device_id[] = {
	{	.compatible	= "arm,gic-v3-its",	},
	{},
};

static int __init its_fsl_mc_msi_init(void)
{
	struct device_node *np;
	struct irq_domain *parent;
	struct irq_domain *mc_msi_domain;

	for (np = of_find_matching_node(NULL, its_device_id); np;
	     np = of_find_matching_node(np, its_device_id)) {
		if (!of_device_is_available(np))
			continue;
		if (!of_property_read_bool(np, "msi-controller"))
			continue;

		parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
		if (!parent || !msi_get_domain_info(parent)) {
			pr_err("%pOF: unable to locate ITS domain\n", np);
			continue;
		}

		mc_msi_domain = fsl_mc_msi_create_irq_domain(
						 of_node_to_fwnode(np),
						 &its_fsl_mc_msi_domain_info,
						 parent);
		if (!mc_msi_domain) {
			pr_err("%pOF: unable to create fsl-mc domain\n", np);
			continue;
		}

		pr_info("fsl-mc MSI: %pOF domain created\n", np);
	}

	return 0;
}

early_initcall(its_fsl_mc_msi_init);
Commit	Line	Data
203e2de3	1	// SPDX-License-Identifier: GPL-2.0
3a288fd5 GR	2	/*
	3	* Freescale Management Complex (MC) bus driver MSI support
	4	*
6466dac7	5	* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
3a288fd5 GR	6	* Author: German Rivera <[email protected]>
3a288fd5 GR	7	*
3a288fd5 GR	8	*/
3a288fd5 GR	9
3a288fd5 GR	10	#include <linux/of_device.h>
3a288fd5 GR	11	#include <linux/of_address.h>
3a288fd5 GR	12	#include <linux/irq.h>
	13	#include <linux/msi.h>
	14	#include <linux/of.h>
	15	#include <linux/of_irq.h>
6bd067c4	16	#include <linux/fsl/mc.h>
3a288fd5 GR	17
3a288fd5 GR	18	static struct irq_chip its_msi_irq_chip = {
d64c28a3	19	.name = "ITS-fMSI",
3a288fd5 GR	20	.irq_mask = irq_chip_mask_parent,
	21	.irq_unmask = irq_chip_unmask_parent,
	22	.irq_eoi = irq_chip_eoi_parent,
	23	.irq_set_affinity = msi_domain_set_affinity
	24	};
	25
	26	static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
	27	struct device *dev,
	28	int nvec, msi_alloc_info_t *info)
	29	{
	30	struct fsl_mc_device *mc_bus_dev;
	31	struct msi_domain_info *msi_info;
	32
a385dd7b	33	if (!dev_is_fsl_mc(dev))
3a288fd5 GR	34	return -EINVAL;
	35
	36	mc_bus_dev = to_fsl_mc_device(dev);
a385dd7b	37	if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
3a288fd5 GR	38	return -EINVAL;
	39
	40	/*
	41	* Set the device Id to be passed to the GIC-ITS:
	42	*
	43	* NOTE: This device id corresponds to the IOMMU stream ID
	44	* associated with the DPRC object (ICID).
	45	*/
	46	info->scratchpad[0].ul = mc_bus_dev->icid;
	47	msi_info = msi_get_domain_info(msi_domain->parent);
147c8f37 MZ	48
	49	/* Allocate at least 32 MSIs, and always as a power of 2 */
	50	nvec = max_t(int, 32, roundup_pow_of_two(nvec));
3a288fd5 GR	51	return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
	52	}
	53
76b94eb1	54	static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
3a288fd5 GR	55	.msi_prepare = its_fsl_mc_msi_prepare,
	56	};
	57
	58	static struct msi_domain_info its_fsl_mc_msi_domain_info = {
	59	.flags = (MSI_FLAG_USE_DEF_DOM_OPS \| MSI_FLAG_USE_DEF_CHIP_OPS),
	60	.ops = &its_fsl_mc_msi_ops,
	61	.chip = &its_msi_irq_chip,
	62	};
	63
	64	static const struct of_device_id its_device_id[] = {
	65	{ .compatible = "arm,gic-v3-its", },
	66	{},
	67	};
	68
a535929f	69	static int __init its_fsl_mc_msi_init(void)
3a288fd5 GR	70	{
	71	struct device_node *np;
	72	struct irq_domain *parent;
	73	struct irq_domain *mc_msi_domain;
	74
	75	for (np = of_find_matching_node(NULL, its_device_id); np;
	76	np = of_find_matching_node(np, its_device_id)) {
95a25625 SB	77	if (!of_device_is_available(np))
95a25625 SB	78	continue;
3a288fd5 GR	79	if (!of_property_read_bool(np, "msi-controller"))
	80	continue;
	81
	82	parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
	83	if (!parent \|\| !msi_get_domain_info(parent)) {
3c18c44d	84	pr_err("%pOF: unable to locate ITS domain\n", np);
3a288fd5 GR	85	continue;
	86	}
	87
	88	mc_msi_domain = fsl_mc_msi_create_irq_domain(
	89	of_node_to_fwnode(np),
	90	&its_fsl_mc_msi_domain_info,
	91	parent);
	92	if (!mc_msi_domain) {
3c18c44d	93	pr_err("%pOF: unable to create fsl-mc domain\n", np);
3a288fd5 GR	94	continue;
	95	}
	96
3c18c44d	97	pr_info("fsl-mc MSI: %pOF domain created\n", np);
3a288fd5 GR	98	}
	99
	100	return 0;
	101	}
1d11d556 IR	102
1d11d556 IR	103	early_initcall(its_fsl_mc_msi_init);