boards/arm/stm32h7/stm32h747i-disco: bring FAT DMA allocator

Buffers are allocated in the main ram, which is suitable for use with the
underlying STM32H7 SDMMC1 core in IDMA mode.

Files are copied from stm32f7/nucleo-144.
This commit is contained in:
Pierre-Olivier Vauboin 2020-03-31 18:11:33 +02:00 committed by Abdelatif Guettouche
parent 07bd520ccb
commit 583d81e3de
4 changed files with 143 additions and 0 deletions

View File

@ -72,4 +72,8 @@ ifeq ($(CONFIG_STM32H7_SDMMC), y)
CSRCS += stm32_sdmmc.c
endif
ifeq ($(CONFIG_FAT_DMAMEMORY), y)
CSRCS += stm32_dma_alloc.c
endif
include $(TOPDIR)/boards/Board.mk

View File

@ -215,6 +215,13 @@ int stm32_bringup(void)
}
#endif /* CONFIG_ADC */
#if defined(CONFIG_FAT_DMAMEMORY)
if (stm32_dma_alloc_init() < 0)
{
syslog(LOG_ERR, "DMA alloc FAILED");
}
#endif
#ifdef HAVE_SDIO
/* Initialize the SDIO block driver */

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@ -0,0 +1,117 @@
/****************************************************************************
* boards/arm/stm32h7/stm32h747i-disco/src/stm32_dma_alloc.c
*
* Copyright (C) 2016 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <syslog.h>
#include <stdint.h>
#include <errno.h>
#include <nuttx/mm/gran.h>
#include "stm32h747i-disco.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] __attribute__((aligned(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 */

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@ -164,6 +164,21 @@ void stm32_spidev_initialize(void);
int stm32_adc_setup(void);
#endif
/****************************************************************************
* Name: stm32_dma_alloc_init
*
* Description:
* Called to create a FAT DMA allocator
*
* Returned Value:
* 0 on success or -ENOMEM
*
****************************************************************************/
#if defined (CONFIG_FAT_DMAMEMORY)
int stm32_dma_alloc_init(void);
#endif
/****************************************************************************
* Name: stm32_sdio_initialize
*