[mirror_ubuntu-jammy-kernel.git] / drivers / vfio / platform / vfio_amba.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2013 - Virtual Open Systems
 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vfio.h>
#include <linux/amba/bus.h>

#include "vfio_platform_private.h"

#define DRIVER_VERSION  "0.10"
#define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
#define DRIVER_DESC     "VFIO for AMBA devices - User Level meta-driver"

/* probing devices from the AMBA bus */

static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
					  int i)
{
	struct amba_device *adev = (struct amba_device *) vdev->opaque;

	if (i == 0)
		return &adev->res;

	return NULL;
}

static int get_amba_irq(struct vfio_platform_device *vdev, int i)
{
	struct amba_device *adev = (struct amba_device *) vdev->opaque;
	int ret = 0;

	if (i < AMBA_NR_IRQS)
		ret = adev->irq[i];

	/* zero is an unset IRQ for AMBA devices */
	return ret ? ret : -ENXIO;
}

static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
{
	struct vfio_platform_device *vdev;
	int ret;

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev)
		return -ENOMEM;

	vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
	if (!vdev->name) {
		kfree(vdev);
		return -ENOMEM;
	}

	vdev->opaque = (void *) adev;
	vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
	vdev->get_resource = get_amba_resource;
	vdev->get_irq = get_amba_irq;
	vdev->parent_module = THIS_MODULE;
	vdev->reset_required = false;

	ret = vfio_platform_probe_common(vdev, &adev->dev);
	if (ret) {
		kfree(vdev->name);
		kfree(vdev);
	}

	return ret;
}

static int vfio_amba_remove(struct amba_device *adev)
{
	struct vfio_platform_device *vdev;

	vdev = vfio_platform_remove_common(&adev->dev);
	if (vdev) {
		kfree(vdev->name);
		kfree(vdev);
		return 0;
	}

	return -EINVAL;
}

static const struct amba_id pl330_ids[] = {
	{ 0, 0 },
};

MODULE_DEVICE_TABLE(amba, pl330_ids);

static struct amba_driver vfio_amba_driver = {
	.probe = vfio_amba_probe,
	.remove = vfio_amba_remove,
	.id_table = pl330_ids,
	.drv = {
		.name = "vfio-amba",
		.owner = THIS_MODULE,
	},
};

module_amba_driver(vfio_amba_driver);

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
36fe431f AM	2	/*
	3	* Copyright (C) 2013 - Virtual Open Systems
	4	* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
36fe431f AM	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/slab.h>
	9	#include <linux/vfio.h>
	10	#include <linux/amba/bus.h>
	11
	12	#include "vfio_platform_private.h"
	13
	14	#define DRIVER_VERSION "0.10"
	15	#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
	16	#define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver"
	17
	18	/* probing devices from the AMBA bus */
	19
	20	static struct resource get_amba_resource(struct vfio_platform_device vdev,
	21	int i)
	22	{
	23	struct amba_device adev = (struct amba_device ) vdev->opaque;
	24
	25	if (i == 0)
	26	return &adev->res;
	27
	28	return NULL;
	29	}
	30
	31	static int get_amba_irq(struct vfio_platform_device *vdev, int i)
	32	{
	33	struct amba_device adev = (struct amba_device ) vdev->opaque;
	34	int ret = 0;
	35
	36	if (i < AMBA_NR_IRQS)
	37	ret = adev->irq[i];
	38
	39	/* zero is an unset IRQ for AMBA devices */
	40	return ret ? ret : -ENXIO;
	41	}
	42
	43	static int vfio_amba_probe(struct amba_device adev, const struct amba_id id)
	44	{
	45	struct vfio_platform_device *vdev;
	46	int ret;
	47
	48	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	49	if (!vdev)
	50	return -ENOMEM;
	51
	52	vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
	53	if (!vdev->name) {
	54	kfree(vdev);
	55	return -ENOMEM;
	56	}
	57
	58	vdev->opaque = (void *) adev;
	59	vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
	60	vdev->get_resource = get_amba_resource;
	61	vdev->get_irq = get_amba_irq;
32a2d71c	62	vdev->parent_module = THIS_MODULE;
b5add544	63	vdev->reset_required = false;
36fe431f AM	64
	65	ret = vfio_platform_probe_common(vdev, &adev->dev);
	66	if (ret) {
	67	kfree(vdev->name);
	68	kfree(vdev);
	69	}
	70
	71	return ret;
	72	}
	73
	74	static int vfio_amba_remove(struct amba_device *adev)
	75	{
	76	struct vfio_platform_device *vdev;
	77
	78	vdev = vfio_platform_remove_common(&adev->dev);
	79	if (vdev) {
	80	kfree(vdev->name);
	81	kfree(vdev);
	82	return 0;
	83	}
	84
	85	return -EINVAL;
	86	}
	87
417fb50d	88	static const struct amba_id pl330_ids[] = {
36fe431f AM	89	{ 0, 0 },
	90	};
	91
	92	MODULE_DEVICE_TABLE(amba, pl330_ids);
	93
	94	static struct amba_driver vfio_amba_driver = {
	95	.probe = vfio_amba_probe,
	96	.remove = vfio_amba_remove,
	97	.id_table = pl330_ids,
	98	.drv = {
	99	.name = "vfio-amba",
	100	.owner = THIS_MODULE,
	101	},
	102	};
	103
	104	module_amba_driver(vfio_amba_driver);
	105
	106	MODULE_VERSION(DRIVER_VERSION);
	107	MODULE_LICENSE("GPL v2");
	108	MODULE_AUTHOR(DRIVER_AUTHOR);
	109	MODULE_DESCRIPTION(DRIVER_DESC);