[mirror_ubuntu-zesty-kernel.git] / drivers / irqchip / irq-gic-v3-its-pci-msi.c

/*
 * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
 * Author: Marc Zyngier <marc.zyngier@arm.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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>

static void its_mask_msi_irq(struct irq_data *d)
{
	pci_msi_mask_irq(d);
	irq_chip_mask_parent(d);
}

static void its_unmask_msi_irq(struct irq_data *d)
{
	pci_msi_unmask_irq(d);
	irq_chip_unmask_parent(d);
}

static struct irq_chip its_msi_irq_chip = {
	.name			= "ITS-MSI",
	.irq_unmask		= its_unmask_msi_irq,
	.irq_mask		= its_mask_msi_irq,
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_write_msi_msg	= pci_msi_domain_write_msg,
};

struct its_pci_alias {
	struct pci_dev	*pdev;
	u32		dev_id;
	u32		count;
};

static int its_pci_msi_vec_count(struct pci_dev *pdev)
{
	int msi, msix;

	msi = max(pci_msi_vec_count(pdev), 0);
	msix = max(pci_msix_vec_count(pdev), 0);

	return max(msi, msix);
}

static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
{
	struct its_pci_alias *dev_alias = data;

	dev_alias->dev_id = alias;
	if (pdev != dev_alias->pdev)
		dev_alias->count += its_pci_msi_vec_count(pdev);

	return 0;
}

static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
			       int nvec, msi_alloc_info_t *info)
{
	struct pci_dev *pdev;
	struct its_pci_alias dev_alias;
	struct msi_domain_info *msi_info;

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

	msi_info = msi_get_domain_info(domain->parent);

	pdev = to_pci_dev(dev);
	dev_alias.pdev = pdev;
	dev_alias.count = nvec;

	pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);

	/* ITS specific DeviceID, as the core ITS ignores dev. */
	info->scratchpad[0].ul = dev_alias.dev_id;

	return msi_info->ops->msi_prepare(domain->parent,
					  dev, dev_alias.count, info);
}

static struct msi_domain_ops its_pci_msi_ops = {
	.msi_prepare	= its_pci_msi_prepare,
};

static struct msi_domain_info its_pci_msi_domain_info = {
	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
		   MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
	.ops	= &its_pci_msi_ops,
	.chip	= &its_msi_irq_chip,
};

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

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

	for (np = of_find_matching_node(NULL, its_device_id); np;
	     np = of_find_matching_node(np, its_device_id)) {
		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("%s: unable to locate ITS domain\n",
			       np->full_name);
			continue;
		}

		if (!pci_msi_create_irq_domain(of_node_to_fwnode(np),
					       &its_pci_msi_domain_info,
					       parent)) {
			pr_err("%s: unable to create PCI domain\n",
			       np->full_name);
			continue;
		}

		pr_info("PCI/MSI: %s domain created\n", np->full_name);
	}

	return 0;
}
early_initcall(its_pci_msi_init);
Commit	Line	Data
f130420e MZ	1	/*
	2	* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
	3	* Author: Marc Zyngier <marc.zyngier@arm.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include <linux/msi.h>
	19	#include <linux/of.h>
	20	#include <linux/of_irq.h>
	21	#include <linux/of_pci.h>
	22
f130420e MZ	23	static void its_mask_msi_irq(struct irq_data *d)
	24	{
	25	pci_msi_mask_irq(d);
	26	irq_chip_mask_parent(d);
	27	}
	28
	29	static void its_unmask_msi_irq(struct irq_data *d)
	30	{
	31	pci_msi_unmask_irq(d);
	32	irq_chip_unmask_parent(d);
	33	}
	34
	35	static struct irq_chip its_msi_irq_chip = {
	36	.name = "ITS-MSI",
	37	.irq_unmask = its_unmask_msi_irq,
	38	.irq_mask = its_mask_msi_irq,
	39	.irq_eoi = irq_chip_eoi_parent,
	40	.irq_write_msi_msg = pci_msi_domain_write_msg,
	41	};
	42
	43	struct its_pci_alias {
	44	struct pci_dev *pdev;
	45	u32 dev_id;
	46	u32 count;
	47	};
	48
	49	static int its_pci_msi_vec_count(struct pci_dev *pdev)
	50	{
	51	int msi, msix;
	52
	53	msi = max(pci_msi_vec_count(pdev), 0);
	54	msix = max(pci_msix_vec_count(pdev), 0);
	55
	56	return max(msi, msix);
	57	}
	58
	59	static int its_get_pci_alias(struct pci_dev pdev, u16 alias, void data)
	60	{
	61	struct its_pci_alias *dev_alias = data;
	62
	63	dev_alias->dev_id = alias;
	64	if (pdev != dev_alias->pdev)
791c76d5	65	dev_alias->count += its_pci_msi_vec_count(pdev);
f130420e MZ	66
	67	return 0;
	68	}
	69
	70	static int its_pci_msi_prepare(struct irq_domain domain, struct device dev,
	71	int nvec, msi_alloc_info_t *info)
	72	{
	73	struct pci_dev *pdev;
	74	struct its_pci_alias dev_alias;
54456db9	75	struct msi_domain_info *msi_info;
f130420e MZ	76
	77	if (!dev_is_pci(dev))
	78	return -EINVAL;
	79
54456db9 MZ	80	msi_info = msi_get_domain_info(domain->parent);
54456db9 MZ	81
f130420e MZ	82	pdev = to_pci_dev(dev);
	83	dev_alias.pdev = pdev;
	84	dev_alias.count = nvec;
	85
	86	pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);
	87
54456db9 MZ	88	/* ITS specific DeviceID, as the core ITS ignores dev. */
	89	info->scratchpad[0].ul = dev_alias.dev_id;
	90
	91	return msi_info->ops->msi_prepare(domain->parent,
	92	dev, dev_alias.count, info);
f130420e MZ	93	}
	94
	95	static struct msi_domain_ops its_pci_msi_ops = {
	96	.msi_prepare = its_pci_msi_prepare,
	97	};
	98
	99	static struct msi_domain_info its_pci_msi_domain_info = {
	100	.flags = (MSI_FLAG_USE_DEF_DOM_OPS \| MSI_FLAG_USE_DEF_CHIP_OPS \|
	101	MSI_FLAG_MULTI_PCI_MSI \| MSI_FLAG_PCI_MSIX),
	102	.ops = &its_pci_msi_ops,
	103	.chip = &its_msi_irq_chip,
	104	};
	105
54456db9 MZ	106	static struct of_device_id its_device_id[] = {
	107	{ .compatible = "arm,gic-v3-its", },
	108	{},
	109	};
	110
	111	static int __init its_pci_msi_init(void)
f130420e	112	{
54456db9 MZ	113	struct device_node *np;
	114	struct irq_domain *parent;
	115
	116	for (np = of_find_matching_node(NULL, its_device_id); np;
	117	np = of_find_matching_node(np, its_device_id)) {
	118	if (!of_property_read_bool(np, "msi-controller"))
	119	continue;
	120
	121	parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
	122	if (!parent \|\| !msi_get_domain_info(parent)) {
	123	pr_err("%s: unable to locate ITS domain\n",
	124	np->full_name);
	125	continue;
	126	}
	127
be5436c8 MZ	128	if (!pci_msi_create_irq_domain(of_node_to_fwnode(np),
be5436c8 MZ	129	&its_pci_msi_domain_info,
54456db9 MZ	130	parent)) {
	131	pr_err("%s: unable to create PCI domain\n",
	132	np->full_name);
	133	continue;
	134	}
	135
	136	pr_info("PCI/MSI: %s domain created\n", np->full_name);
	137	}
	138
	139	return 0;
f130420e	140	}
54456db9	141	early_initcall(its_pci_msi_init);