mbox.h

/*
 * Copyright (C) 2022 (Unix69@github)
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */


#ifndef MBOX_H
#define MBOX_H

#include "mmu.h"

#define VIDEOCORE_MBOX  (MMIO_BASE+0x0000B880)
#define MBOX_READ       ((volatile unsigned int*)(VIDEOCORE_MBOX+0x0))
#define MBOX_POLL       ((volatile unsigned int*)(VIDEOCORE_MBOX+0x10))
#define MBOX_SENDER     ((volatile unsigned int*)(VIDEOCORE_MBOX+0x14))
#define MBOX_STATUS     ((volatile unsigned int*)(VIDEOCORE_MBOX+0x18))
#define MBOX_CONFIG     ((volatile unsigned int*)(VIDEOCORE_MBOX+0x1C))
#define MBOX_WRITE      ((volatile unsigned int*)(VIDEOCORE_MBOX+0x20))
#define MBOX_RESPONSE   0x80000000
#define MBOX_FULL       0x80000000
#define MBOX_EMPTY      0x40000000

/* a properly aligned buffer */
extern volatile unsigned int mbox[36];

/* mailbox message buffer */
volatile unsigned int  __attribute__((aligned(16))) mbox[36];

#define MBOX_REQUEST    0

/* channels */
#define MBOX_CH_POWER   0
#define MBOX_CH_FB      1
#define MBOX_CH_VUART   2
#define MBOX_CH_VCHIQ   3
#define MBOX_CH_LEDS    4
#define MBOX_CH_BTNS    5
#define MBOX_CH_TOUCH   6
#define MBOX_CH_COUNT   7
#define MBOX_CH_PROP    8

/* tags */
#define MBOX_TAG_SETCLKRATE     0x38002
#define MBOX_TAG_LAST           0

int mbox_call(unsigned char ch);







#endif