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From aguettou...@apache.org
Subject [incubator-nuttx] 03/07: boards/arm/stm32h7/stm32h747i-disco: bring FAT DMA allocator
Date Fri, 15 May 2020 22:11:46 GMT
This is an automated email from the ASF dual-hosted git repository.

aguettouche pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git

commit 583d81e3dea2572da301124ffaf2781b92e1d5f2
Author: Pierre-Olivier Vauboin <po@lambdaconcept.com>
AuthorDate: Tue Mar 31 18:11:33 2020 +0200

    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.
---
 boards/arm/stm32h7/stm32h747i-disco/src/Makefile   |   4 +
 .../stm32h7/stm32h747i-disco/src/stm32_bringup.c   |   7 ++
 .../stm32h7/stm32h747i-disco/src/stm32_dma_alloc.c | 117 +++++++++++++++++++++
 .../stm32h747i-disco/src/stm32h747i-disco.h        |  15 +++
 4 files changed, 143 insertions(+)

diff --git a/boards/arm/stm32h7/stm32h747i-disco/src/Makefile b/boards/arm/stm32h7/stm32h747i-disco/src/Makefile
index 9518e4f..9241b0c 100644
--- a/boards/arm/stm32h7/stm32h747i-disco/src/Makefile
+++ b/boards/arm/stm32h7/stm32h747i-disco/src/Makefile
@@ -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
diff --git a/boards/arm/stm32h7/stm32h747i-disco/src/stm32_bringup.c b/boards/arm/stm32h7/stm32h747i-disco/src/stm32_bringup.c
index 28c1939..a21db33 100644
--- a/boards/arm/stm32h7/stm32h747i-disco/src/stm32_bringup.c
+++ b/boards/arm/stm32h7/stm32h747i-disco/src/stm32_bringup.c
@@ -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 */
 
diff --git a/boards/arm/stm32h7/stm32h747i-disco/src/stm32_dma_alloc.c b/boards/arm/stm32h7/stm32h747i-disco/src/stm32_dma_alloc.c
new file mode 100644
index 0000000..8498d5a
--- /dev/null
+++ b/boards/arm/stm32h7/stm32h747i-disco/src/stm32_dma_alloc.c
@@ -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 */
diff --git a/boards/arm/stm32h7/stm32h747i-disco/src/stm32h747i-disco.h b/boards/arm/stm32h7/stm32h747i-disco/src/stm32h747i-disco.h
index a5c43ad7..9ab7000 100644
--- a/boards/arm/stm32h7/stm32h747i-disco/src/stm32h747i-disco.h
+++ b/boards/arm/stm32h7/stm32h747i-disco/src/stm32h747i-disco.h
@@ -165,6 +165,21 @@ 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
  *
  * Description:


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