106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/****************************************************************************
|
|
* boards/arm/stm32/nucleo-f429zi/src/stm32_dma_alloc.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <syslog.h>
|
|
#include <stdint.h>
|
|
#include <errno.h>
|
|
#include <nuttx/mm/gran.h>
|
|
|
|
#include "nucleo-144.h"
|
|
|
|
#if defined(CONFIG_FAT_DMAMEMORY)
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#if !defined(CONFIG_GRAN)
|
|
# error microSD DMA support requires CONFIG_GRAN
|
|
#endif
|
|
|
|
#define BOARD_DMA_ALLOC_POOL_SIZE (8*512)
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static GRAN_HANDLE dma_allocator;
|
|
|
|
/* The DMA heap size constrains the total number of things that can be
|
|
* ready to do DMA at a time.
|
|
*
|
|
* For example, FAT DMA depends on one sector-sized buffer per
|
|
* filesystem plus one sector-sized buffer per file.
|
|
*
|
|
* We use a fundamental alignment / granule size of 64B; this is
|
|
* sufficient to guarantee alignment for the largest STM32 DMA burst
|
|
* (16 beats x 32bits).
|
|
*/
|
|
|
|
static uint8_t g_dma_heap[BOARD_DMA_ALLOC_POOL_SIZE]
|
|
aligned_data(64);
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: stm32_dma_alloc_init
|
|
*
|
|
* Description:
|
|
* All boards may optionally provide this API to instantiate a pool of
|
|
* memory for uses with FAST FS DMA operations.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int stm32_dma_alloc_init(void)
|
|
{
|
|
dma_allocator = gran_initialize(g_dma_heap,
|
|
sizeof(g_dma_heap),
|
|
7, /* 128B granule - must be > alignment (XXX bug?) */
|
|
6); /* 64B alignment */
|
|
|
|
if (dma_allocator == NULL)
|
|
{
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* DMA-aware allocator stubs for the FAT filesystem. */
|
|
|
|
void *fat_dma_alloc(size_t size)
|
|
{
|
|
return gran_alloc(dma_allocator, size);
|
|
}
|
|
|
|
void fat_dma_free(FAR void *memory, size_t size)
|
|
{
|
|
gran_free(dma_allocator, memory, size);
|
|
}
|
|
|
|
#endif /* CONFIG_FAT_DMAMEMORY */
|