143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <gpio.h>
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#include <mbox.h>
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#include <string.h>
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#include <kmalloc.h>
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#include <thread.h>
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#include <logger.h>
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#include <utils.h>
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/* mailbox message buffer */
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// volatile unsigned int __attribute__((aligned(16))) mbox[36];
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#define VIDEOCORE_MBOX (MMIO_BASE+0x0000B880)
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#define MBOX_READ ((volatile unsigned int*)(VIDEOCORE_MBOX+0x0))
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#define MBOX_POLL ((volatile unsigned int*)(VIDEOCORE_MBOX+0x10))
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#define MBOX_SENDER ((volatile unsigned int*)(VIDEOCORE_MBOX+0x14))
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#define MBOX_STATUS ((volatile unsigned int*)(VIDEOCORE_MBOX+0x18))
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#define MBOX_CONFIG ((volatile unsigned int*)(VIDEOCORE_MBOX+0x1C))
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#define MBOX_WRITE ((volatile unsigned int*)(VIDEOCORE_MBOX+0x20))
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#define MBOX_RESPONSE 0x80000000
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#define MBOX_FULL 0x80000000
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#define MBOX_EMPTY 0x40000000
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#define MAILBOX_BASE MMIO_BASE + 0xb880
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#define REQUEST_SUCCEED 0x80000000
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#define REQUEST_FAILED 0x80000001
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#define TAG_MBOX_REQUEST 0x00000000
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/**
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* Make a mailbox call. Returns 0 on failure, non-zero on success
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*/
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int mbox_call(unsigned char ch, unsigned int *input)
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{
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unsigned int *_mbox = kmalloc((size_t)input[0] + 0xf), *mbox = ALIGN16(_mbox);
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LOG(_mbox); LOG(mbox); DEBUG_THREAD((size_t)input[0]);
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memcpy(mbox, input, (size_t)input[0]);
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unsigned int r = (unsigned long)mbox | (unsigned int)(ch&0xf);
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/* wait until we can write to the mailbox */
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do yield();
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while(*MBOX_STATUS & MBOX_FULL);
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/* write the address of our message to the mailbox with channel identifier */
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*MBOX_WRITE = r;
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/* now wait for the response */
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for (;;) {
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/* is there a response? */
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do yield();
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while(*MBOX_STATUS & MBOX_EMPTY);
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/* is it a response to our message? */
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if(r == *MBOX_READ) {
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/* is it a valid successful response? */
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if (mbox[1] == MBOX_RESPONSE)
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memcpy(input, mbox, (size_t)input[0]);
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kfree(_mbox);
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return mbox[1] == MBOX_RESPONSE;
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}
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}
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return 0;
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}
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unsigned int get_board_revision(void)
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{
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unsigned int __attribute__((aligned(16))) mbox[36];
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mbox[0] = 36 * 4;
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mbox[1] = MBOX_REQUEST;
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// tags
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mbox[2] = MBOX_TAG_BOARD_REVISION;
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mbox[3] = 4;
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mbox[4] = TAG_MBOX_REQUEST;
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mbox[5] = 0; // value buffer
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mbox[6] = MBOX_TAG_LAST;
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mbox_call(MBOX_CH_PROP, mbox);
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return mbox[5];
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}
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unsigned int get_memory_base_addr(void)
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{
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unsigned int __attribute__((aligned(16))) mbox[36];
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mbox[0] = 36 * 4;
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mbox[1] = MBOX_REQUEST;
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// tags
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mbox[2] = MBOX_TAG_ARM_MEMORY;
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mbox[3] = 8;
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mbox[4] = 8;
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mbox[5] = 0;
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mbox[6] = 0;
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mbox[7] = MBOX_TAG_LAST;
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mbox_call(MBOX_CH_PROP, mbox);
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return mbox[5];
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}
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unsigned int get_memory_size(void)
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{
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unsigned int __attribute__((aligned(16))) mbox[36];
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mbox[0] = 36 * 4;
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mbox[1] = MBOX_REQUEST;
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// tags
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mbox[2] = MBOX_TAG_ARM_MEMORY;
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mbox[3] = 8;
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mbox[4] = 8;
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mbox[5] = 0;
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mbox[6] = 0;
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mbox[7] = MBOX_TAG_LAST;
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mbox_call(MBOX_CH_PROP, mbox);
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return mbox[6];
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}
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