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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 | ||
1862ee22 | 54 | /* Bitmask of the features supported by the device (host) |
edfd52e6 | 55 | * (32 bits per set) - Read Only */ |
1862ee22 | 56 | #define VIRTIO_MMIO_DEVICE_FEATURES 0x010 |
edfd52e6 | 57 | |
1862ee22 PM |
58 | /* Device (host) features set selector - Write Only */ |
59 | #define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014 | |
edfd52e6 | 60 | |
1862ee22 | 61 | /* Bitmask of features activated by the driver (guest) |
edfd52e6 | 62 | * (32 bits per set) - Write Only */ |
1862ee22 | 63 | #define VIRTIO_MMIO_DRIVER_FEATURES 0x020 |
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64 | |
65 | /* Activated features set selector - Write Only */ | |
1862ee22 PM |
66 | #define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024 |
67 | ||
68 | ||
69 | #ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */ | |
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70 | |
71 | /* Guest's memory page size in bytes - Write Only */ | |
72 | #define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028 | |
73 | ||
1862ee22 PM |
74 | #endif |
75 | ||
76 | ||
edfd52e6 PM |
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 | ||
1862ee22 PM |
86 | |
87 | #ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */ | |
88 | ||
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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 | ||
1862ee22 PM |
95 | #endif |
96 | ||
97 | ||
98 | /* Ready bit for the currently selected queue - Read Write */ | |
99 | #define VIRTIO_MMIO_QUEUE_READY 0x044 | |
100 | ||
edfd52e6 PM |
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 | ||
1862ee22 PM |
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 | ||
edfd52e6 PM |
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 |