| Antonios Motakis | 36fe431 | 2015-03-16 14:08:44 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 - Virtual Open Systems |
| 3 | * Author: Antonios Motakis <a.motakis@virtualopensystems.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 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/vfio.h> |
| 18 | #include <linux/amba/bus.h> |
| 19 | |
| 20 | #include "vfio_platform_private.h" |
| 21 | |
| 22 | #define DRIVER_VERSION "0.10" |
| 23 | #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" |
| 24 | #define DRIVER_DESC "VFIO for AMBA devices - User Level meta-driver" |
| 25 | |
| 26 | /* probing devices from the AMBA bus */ |
| 27 | |
| 28 | static struct resource *get_amba_resource(struct vfio_platform_device *vdev, |
| 29 | int i) |
| 30 | { |
| 31 | struct amba_device *adev = (struct amba_device *) vdev->opaque; |
| 32 | |
| 33 | if (i == 0) |
| 34 | return &adev->res; |
| 35 | |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | static int get_amba_irq(struct vfio_platform_device *vdev, int i) |
| 40 | { |
| 41 | struct amba_device *adev = (struct amba_device *) vdev->opaque; |
| 42 | int ret = 0; |
| 43 | |
| 44 | if (i < AMBA_NR_IRQS) |
| 45 | ret = adev->irq[i]; |
| 46 | |
| 47 | /* zero is an unset IRQ for AMBA devices */ |
| 48 | return ret ? ret : -ENXIO; |
| 49 | } |
| 50 | |
| 51 | static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id) |
| 52 | { |
| 53 | struct vfio_platform_device *vdev; |
| 54 | int ret; |
| 55 | |
| 56 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); |
| 57 | if (!vdev) |
| 58 | return -ENOMEM; |
| 59 | |
| 60 | vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid); |
| 61 | if (!vdev->name) { |
| 62 | kfree(vdev); |
| 63 | return -ENOMEM; |
| 64 | } |
| 65 | |
| 66 | vdev->opaque = (void *) adev; |
| 67 | vdev->flags = VFIO_DEVICE_FLAGS_AMBA; |
| 68 | vdev->get_resource = get_amba_resource; |
| 69 | vdev->get_irq = get_amba_irq; |
| 70 | |
| 71 | ret = vfio_platform_probe_common(vdev, &adev->dev); |
| 72 | if (ret) { |
| 73 | kfree(vdev->name); |
| 74 | kfree(vdev); |
| 75 | } |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | static int vfio_amba_remove(struct amba_device *adev) |
| 81 | { |
| 82 | struct vfio_platform_device *vdev; |
| 83 | |
| 84 | vdev = vfio_platform_remove_common(&adev->dev); |
| 85 | if (vdev) { |
| 86 | kfree(vdev->name); |
| 87 | kfree(vdev); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | return -EINVAL; |
| 92 | } |
| 93 | |
| 94 | static struct amba_id pl330_ids[] = { |
| 95 | { 0, 0 }, |
| 96 | }; |
| 97 | |
| 98 | MODULE_DEVICE_TABLE(amba, pl330_ids); |
| 99 | |
| 100 | static struct amba_driver vfio_amba_driver = { |
| 101 | .probe = vfio_amba_probe, |
| 102 | .remove = vfio_amba_remove, |
| 103 | .id_table = pl330_ids, |
| 104 | .drv = { |
| 105 | .name = "vfio-amba", |
| 106 | .owner = THIS_MODULE, |
| 107 | }, |
| 108 | }; |
| 109 | |
| 110 | module_amba_driver(vfio_amba_driver); |
| 111 | |
| 112 | MODULE_VERSION(DRIVER_VERSION); |
| 113 | MODULE_LICENSE("GPL v2"); |
| 114 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 115 | MODULE_DESCRIPTION(DRIVER_DESC); |