1 /*
2 * Virtio platform device driver
3 *
4 * Copyright 2011, ARM Ltd.
5 *
6 * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
7 *
8 * This header is BSD licensed so anyone can use the definitions to implement
9 * compatible drivers/servers.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of IBM nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef _LINUX_VIRTIO_MMIO_H
36 #define _LINUX_VIRTIO_MMIO_H
37
38 /*
39 * Control registers
40 */
41
42 /* Magic value ("virt" string) - Read Only */
43 #define VIRTIO_MMIO_MAGIC_VALUE 0x000
44
45 /* Virtio device version - Read Only */
46 #define VIRTIO_MMIO_VERSION 0x004
47
48 /* Virtio device ID - Read Only */
49 #define VIRTIO_MMIO_DEVICE_ID 0x008
50
51 /* Virtio vendor ID - Read Only */
52 #define VIRTIO_MMIO_VENDOR_ID 0x00c
53
54 /* Bitmask of the features supported by the device (host)
55 * (32 bits per set) - Read Only */
56 #define VIRTIO_MMIO_DEVICE_FEATURES 0x010
57
58 /* Device (host) features set selector - Write Only */
59 #define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
60
61 /* Bitmask of features activated by the driver (guest)
62 * (32 bits per set) - Write Only */
63 #define VIRTIO_MMIO_DRIVER_FEATURES 0x020
64
65 /* Activated features set selector - Write Only */
66 #define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
67
68
69 #ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
70
71 /* Guest's memory page size in bytes - Write Only */
72 #define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028
73
74 #endif
75
76
77 /* Queue selector - Write Only */
78 #define VIRTIO_MMIO_QUEUE_SEL 0x030
79
80 /* Maximum size of the currently selected queue - Read Only */
81 #define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
82
83 /* Queue size for the currently selected queue - Write Only */
84 #define VIRTIO_MMIO_QUEUE_NUM 0x038
85
86
87 #ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
88
89 /* Used Ring alignment for the currently selected queue - Write Only */
90 #define VIRTIO_MMIO_QUEUE_ALIGN 0x03c
91
92 /* Guest's PFN for the currently selected queue - Read Write */
93 #define VIRTIO_MMIO_QUEUE_PFN 0x040
94
95 #endif
96
97
98 /* Ready bit for the currently selected queue - Read Write */
99 #define VIRTIO_MMIO_QUEUE_READY 0x044
100
101 /* Queue notifier - Write Only */
102 #define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
103
104 /* Interrupt status - Read Only */
105 #define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
106
107 /* Interrupt acknowledge - Write Only */
108 #define VIRTIO_MMIO_INTERRUPT_ACK 0x064
109
110 /* Device status register - Read Write */
111 #define VIRTIO_MMIO_STATUS 0x070
112
113 /* Selected queue's Descriptor Table address, 64 bits in two halves */
114 #define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
115 #define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
116
117 /* Selected queue's Available Ring address, 64 bits in two halves */
118 #define VIRTIO_MMIO_QUEUE_AVAIL_LOW 0x090
119 #define VIRTIO_MMIO_QUEUE_AVAIL_HIGH 0x094
120
121 /* Selected queue's Used Ring address, 64 bits in two halves */
122 #define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0
123 #define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4
124
125 /* Configuration atomicity value */
126 #define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc
127
128 /* The config space is defined by each driver as
129 * the per-driver configuration space - Read Write */
130 #define VIRTIO_MMIO_CONFIG 0x100
131
132
133
134 /*
135 * Interrupt flags (re: interrupt status & acknowledge registers)
136 */
137
138 #define VIRTIO_MMIO_INT_VRING (1 << 0)
139 #define VIRTIO_MMIO_INT_CONFIG (1 << 1)
140
141 #endif