include/hw/misc/bcm2835_mbox_defs.h

   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 */