xref: /qemu/include/hw/misc/bcm2835_mbox_defs.h (revision 6111a0c0)
1 /*
2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
3  *
4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
5  * See the COPYING file in the top-level directory.
6  */
7 
8 #ifndef BCM2835_MBOX_DEFS_H
9 #define BCM2835_MBOX_DEFS_H
10 
11 /* Constants shared with the ARM identifying separate mailbox channels */
12 #define MBOX_CHAN_POWER    0 /* for use by the power management interface */
13 #define MBOX_CHAN_FB       1 /* for use by the frame buffer */
14 #define MBOX_CHAN_VCHIQ    3 /* for use by the VCHIQ interface */
15 #define MBOX_CHAN_PROPERTY 8 /* for use by the property channel */
16 #define MBOX_CHAN_COUNT    9
17 
18 #define MBOX_SIZE          32
19 #define MBOX_INVALID_DATA  0x0f
20 
21 /* Layout of the private address space used for communication between
22  * the mbox device emulation, and child devices: each channel occupies
23  * 16 bytes of address space, but only two registers are presently defined.
24  */
25 #define MBOX_AS_CHAN_SHIFT 4
26 #define MBOX_AS_DATA       0 /* request / response data (RW at offset 0) */
27 #define MBOX_AS_PENDING    4 /* pending response status (RO at offset 4) */
28 
29 #endif /* BCM2835_MBOX_DEFS_H */
30