120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
/****************************************************************************
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* boards/arm/stm32f7/stm32f746-ws/src/stm32_dma_alloc.c
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*
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* Copyright (C) 2016 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <syslog.h>
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#include <stdint.h>
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#include <errno.h>
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#include <nuttx/mm/gran.h>
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#include "stm32f746-ws.h"
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#if defined(CONFIG_FAT_DMAMEMORY)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if !defined(CONFIG_GRAN)
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# error microSD DMA support requires CONFIG_GRAN
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#endif
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#define BOARD_DMA_ALLOC_POOL_SIZE (8*512)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static GRAN_HANDLE dma_allocator;
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/* The DMA heap size constrains the total number of things that can be
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* ready to do DMA at a time.
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*
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* For example, FAT DMA depends on one sector-sized buffer per filesystem
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* plus one sector-sized buffer per file.
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*
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* We use a fundamental alignment / granule size of 64B; this is sufficient
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* to guarantee alignment for the largest STM32 DMA burst
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* (16 beats x 32bits).
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*/
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static
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uint8_t g_dma_heap[BOARD_DMA_ALLOC_POOL_SIZE] aligned_data(64);
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_dma_alloc_init
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*
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* Description:
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* All boards may optionally provide this API to instantiate a pool of
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* memory for uses with FAST FS DMA operations.
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*
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****************************************************************************/
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int stm32_dma_alloc_init(void)
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{
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dma_allocator = gran_initialize(g_dma_heap,
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sizeof(g_dma_heap),
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7, /* 128B granule - must be > alignment (XXX bug?) */
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6); /* 64B alignment */
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if (dma_allocator == NULL)
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{
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return -ENOMEM;
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}
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return OK;
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}
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/* DMA-aware allocator stubs for the FAT filesystem. */
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void *fat_dma_alloc(size_t size)
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{
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return gran_alloc(dma_allocator, size);
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}
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void fat_dma_free(void *memory, size_t size)
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{
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gran_free(dma_allocator, memory, size);
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}
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#endif /* CONFIG_FAT_DMAMEMORY */
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