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nuttx/arch/arm/src/stm32/stm32_allocateheap.c
patacongo f0e62b7116 Add logic to support the FSMC SRAM in the NuttX heap 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4433 42af7a65-404d-4744-a932-0658087f49c3
2012-02-27 23:14:43 +00:00

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/****************************************************************************
* arch/arm/src/stm32/up_allocateheap.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 <sys/types.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/mm.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/* Internal SRAM is available in all members of the STM32 family. The
* following definitions must be provided to specify the size and
* location of internal(system) SRAM:
*
* CONFIG_DRAM_END : End address (+1) of SRAM (F1 family only, the
* : F4 family uses the a priori end of SRAM)
*
* The F4 family also contains internal TCM SRAM. This SRAM is different
* because it cannot be used for DMA. So if DMA needed, then the following
* should be defined to exclude TCM SRAM from the heap:
*
* CONFIG_STM32_TCMEXCLUDE : Exclude TCM SRAM from the HEAP
*
* In addition to internal SRAM, SRAM may also be available through the FSMC.
* In order to use FSMC SRAM, the following additional things need to be
* present in the NuttX configuration file:
*
* CONFIG_STM32_FSMC=y : Enables the FSMC
* CONFIG_STM32_FSMC_SRAM=y : Indicates that SRAM is available via the
* FSMC (as opposed to an LCD or FLASH).
* CONFIG_HEAP2_BASE : The base address of the SRAM in the FSMC
* address space
* CONFIG_HEAP2_END : The end (+1) of the SRAM in the FSMC
* address space
* CONFIG_MM_REGIONS : Must be set to a large enough value to
* include the FSMC SRAM (as determined by the rules provided below)
*/
#ifndef CONFIG_STM32_FSMC
# undef CONFIG_STM32_FSMC_SRAM
#endif
/* For the STM312F10xxx family, all internal SRAM is in one contiguous block
* starting at g_heapbase and extending through CONFIG_DRAM_END (my apologies for
* the bad naming). In addition, external FSMC SRAM may be available.
*/
#if defined(CONFIG_STM32_STM32F10XX)
/* Set the end of system SRAM */
# define SRAM1_END CONFIG_DRAM_END
/* Check if external FSMC SRAM is provided */
# if CONFIG_STM32_FSMC_SRAM
# if CONFIG_MM_REGIONS < 2
# warning "FSMC SRAM not included in the heap"
# undef CONFIG_STM32_FSMC_SRAM
# elif CONFIG_MM_REGIONS > 2
# error "CONFIG_MM_REGIONS > 2 but I don't know what any of the region(s) are"
# undef CONFIG_MM_REGIONS
# define CONFIG_MM_REGIONS 2
# endif
# elif CONFIG_MM_REGIONS > 1
# error "CONFIG_MM_REGIONS > 1 but I don't know what any of the region(s) are"
# endif
/* The STM32 F1 has not TCM SRAM */
# undef CONFIG_STM32_TCMEXCLUDE
# define CONFIG_STM32_TCMEXCLUDE 1
/* All members of the STM32F40xxx family have 192Kb in three banks:
*
* 1) 112Kb of System SRAM beginning at address 0x2000:0000
* 2) 16Kb of System SRAM beginning at address 0x2001:c000
* 3) 64Kb of TCM SRAM beginning at address 0x1000:0000
*
* As determined by ld.script, g_heapbase lies in the 112Kb memory
* region and that extends to 0x2001:0000. But the first and second memory
* regions are contiguous and treated as one in this logic that extends to
* 0x2002:0000.
*
* As a complication, it appears that TCM SRAM cannot be used for DMA. So, if
* STM32 DMA is enabled, TCM SRAM should probably be excluded from the heap.
*
* In addition, external FSMC SRAM may be available.
*/
#elif defined(CONFIG_STM32_STM32F40XX)
/* Set the end of system SRAM */
# define SRAM1_END 0x20020000
/* Set the range of TCM SRAM as well (although we may not use it) */
# define SRAM2_START 0x10000000
# define SRAM2_END 0x10010000
/* There are 4 possible SRAM configurations:
*
* Configuration 1. System SRAM (only)
* CONFIG_MM_REGIONS == 1
* CONFIG_STM32_FSMC_SRAM NOT defined
* CONFIG_STM32_TCMEXCLUDE defined
* Configuration 2. System SRAM and TCM SRAM
* CONFIG_MM_REGIONS == 2
* CONFIG_STM32_FSMC_SRAM NOT defined
* CONFIG_STM32_TCMEXCLUDE NOT defined
* Configuration 3. System SRAM and FSMC SRAM
* CONFIG_MM_REGIONS == 2
* CONFIG_STM32_FSMC_SRAM defined
* CONFIG_STM32_TCMEXCLUDE defined
* Configuration 4. System SRAM, TCM SRAM, and FSMC SRAM
* CONFIG_MM_REGIONS == 3
* CONFIG_STM32_FSMC_SRAM defined
* CONFIG_STM32_TCMEXCLUDE NOT defined
*
* Let's make sure that all definitions are consitent before doing
* anything else
*/
# if defined(CONFIG_STM32_FSMC_SRAM)
/* Configuration 3 or 4. External SRAM is available. CONFIG_MM_REGIONS
* should be at least 2.
*/
# if CONFIG_MM_REGIONS < 2
/* Only one memory region. Force Configuration 1 */
# warning "FSMC SRAM (and TCM SRAM) excluded from the heap"
# undef CONFIG_STM32_FSMC_SRAM
# undef CONFIG_STM32_TCMEXCLUDE
# define CONFIG_STM32_TCMEXCLUDE 1
/* CONFIG_MM_REGIONS may be 3 if TCM SRAM is included in the head */
# elif CONFIG_MM_REGIONS > 2
/* More than two memory regions. This is okay if TCM SRAM is not
* disabled.
*/
# if defined(CONFIG_STM32_TCMEXCLUDE)
/* Configuration 3: CONFIG_MM_REGIONS should have been 2 */
# error "CONFIG_MM_REGIONS > 2 but I don't know what any of the region(s) are"
# undef CONFIG_MM_REGIONS
# define CONFIG_MM_REGIONS 2
# else
/* Configuration 4: DMA should be disabled and CONFIG_MM_REGIONS
* should be 3.
*/
# ifdef (CONFIG_STM32_DMA)
# warning "TCM SRAM is included in the heap AND DMA is enabled"
# endif
# if CONFIG_MM_REGIONS != 3
# error "CONFIG_MM_REGIONS > 3 but I don't know what any of the region(s) are"
# undef CONFIG_MM_REGIONS
# define CONFIG_MM_REGIONS 3
# endif
# endif
/* CONFIG_MM_REGIONS is exactly 2. We cannot support both TCM SRAM and
* FSMC SRAM.
*/
# elif !defined(CONFIG_STM32_TCMEXCLUDE)
# error "CONFIG_MM_REGIONS == 2, cannot support both TCM SRAM and FSMC SRAM"
# undef CONFIG_STM32_TCMEXCLUDE
# define CONFIG_STM32_TCMEXCLUDE 1
# endif
# elif !defined(CONFIG_STM32_TCMEXCLUDE)
/* Configuration 2: FSMC SRAM is not used, but TCM SRAM is requested. DMA
* should be disabled and CONFIG_MM_REGIONS should be 2.
*/
# ifdef (CONFIG_STM32_DMA)
# warning "TCM SRAM is included in the heap AND DMA is enabled"
# endif
# if CONFIG_MM_REGIONS < 2
# error "TCM SRAM excluded from the heap because CONFIG_MM_REGIONS < 2"
# undef CONFIG_STM32_TCMEXCLUDE
# define CONFIG_STM32_TCMEXCLUDE 1
# elif CONFIG_MM_REGIONS > 2
# error "CONFIG_MM_REGIONS > 2 but I don't know what any of the region(s) are"
# undef CONFIG_MM_REGIONS
# define CONFIG_MM_REGIONS 2
# endif
# endif
#else
# error "Unsupported STM32 chip"
#endif
/* If FSMC SRAM is going to be used as heap, then verify that the starting
* address and size of the external SRAM region has been provided in the
* configuration.
*/
#ifdef CONFIG_STM32_FSMC_SRAM
# if !defined(CONFIG_HEAP2_BASE) || !defined(CONFIG_HEAP2_END)
# error "CONFIG_HEAP2_BASE and CONFIG_HEAP2_END must be provided"
# undef CONFIG_STM32_FSMC_SRAM
# endif
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_allocate_heap
*
* Description:
* The heap may be statically allocated by
* defining CONFIG_HEAP_BASE and CONFIG_HEAP_SIZE. If these
* are not defined, then this function will be called to
* dynamically set aside the heap region.
*
****************************************************************************/
void up_allocate_heap(FAR void **heap_start, size_t *heap_size)
{
up_ledon(LED_HEAPALLOCATE);
*heap_start = (FAR void*)g_heapbase;
*heap_size = SRAM1_END - g_heapbase;
}
/****************************************************************************
* Name: up_addregion
*
* Description:
* Memory may be added in non-contiguous chunks. Additional chunks are
* added by calling this function.
*
****************************************************************************/
#if CONFIG_MM_REGIONS > 1
void up_addregion(void)
{
/* Add the STM32F40xxx TCM SRAM heap region. */
#ifndef CONFIG_STM32_TCMEXCLUDE
mm_addregion((FAR void*)SRAM2_START, SRAM2_END-SRAM2_START);
#endif
/* Add the user specified heap region. */
#ifdef CONFIG_STM32_FSMC_SRAM
mm_addregion((FAR void*)CONFIG_HEAP2_BASE, CONFIG_HEAP2_END - CONFIG_HEAP2_BASE);
# endif
}
#endif
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