mirror of
https://github.com/apache/nuttx.git
synced 2026-06-06 08:36:24 +08:00
Add framework for EFM32 DMA support -- no logic in place yet
This commit is contained in:
Gregory Nutt
@@ -110,6 +110,11 @@ config EFM32_LEUART
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# Then, these are the actual, selectable peripheral options
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config EFM32_DMA
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bool "DMA"
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default n
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select ARCH_DMA
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config EFM32_USART0
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bool "USART0"
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default n
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@@ -118,3 +118,7 @@ endif
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ifeq ($(CONFIG_EFM32_GPIO_IRQ),y)
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CHIP_CSRCS += efm32_gpioirq.c
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endif
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ifeq ($(CONFIG_EFM32_DMA),y)
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CHIP_CSRCS += efm32_dma.c
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endif
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@@ -0,0 +1,254 @@
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/*****************************************************************************
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* arch/arm/src/efm32/efm32_dma.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
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||||
* 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.
|
||||
*
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* 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
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||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* 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 <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "efm32_dma.h"
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/*****************************************************************************
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* Public Types
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*****************************************************************************/
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/*****************************************************************************
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* Public Data
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*****************************************************************************/
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/*****************************************************************************
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* Private Functions
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*****************************************************************************/
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/*****************************************************************************
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* Public Functions
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*****************************************************************************/
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/*****************************************************************************
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* Name: efm32_dmachannel
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*
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* Description:
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* Allocate a DMA channel. This function gives the caller mutually
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* exclusive access to the DMA channel specified by the 'chan' argument.
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* DMA channels are shared on the EFM32: Devices sharing the same DMA
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* channel cannot do DMA concurrently! See the DMACHAN_* definitions in
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* efm32_dma.h.
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*
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* If the DMA channel is not available, then efm32_dmachannel() will wait
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* until the holder of the channel relinquishes the channel by calling
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* efm32_dmafree(). WARNING: If you have two devices sharing a DMA
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* channel and the code never releases the channel, the efm32_dmachannel
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* call for the other will hang forever in this function! Don't let your
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* design do that!
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*
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* Hmm.. I suppose this interface could be extended to make a non-blocking
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* version. Feel free to do that if that is what you need.
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*
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* Input parameter:
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* chan - Identifies the channel resource
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*
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* Returned Value:
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* Provided that 'chan' is valid, this function ALWAYS returns a non-NULL,
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* void* DMA channel handle. (If 'chan' is invalid, the function will
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* assert if debug is enabled or do something ignorant otherwise).
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*
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* Assumptions:
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* - The caller does not hold he DMA channel.
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* - The caller can wait for the DMA channel to be freed if it is no
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* available.
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*
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*****************************************************************************/
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DMA_HANDLE efm32_dmachannel(unsigned int chan)
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{
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#warning Missing logic
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return NULL;
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}
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/****************************************************************************
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* Name: efm32_dmafree
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*
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* Description:
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* Release a DMA channel. If another thread is waiting for this DMA channel
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* in a call to efm32_dmachannel, then this function will re-assign the
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* DMA channel to that thread and wake it up. NOTE: The 'handle' used
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* in this argument must NEVER be used again until efm32_dmachannel() is
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* called again to re-gain access to the channel.
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* - The caller holds the DMA channel.
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* - There is no DMA in progress
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*
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****************************************************************************/
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void efm32_dmafree(DMA_HANDLE handle)
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{
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#warning Missing logic
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}
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/****************************************************************************
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* Name: efm32_dmasetup
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*
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* Description:
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* Configure DMA before using
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*
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****************************************************************************/
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void efm32_dmasetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
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size_t ntransfers, uint32_t ccr)
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{
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#warning Missing logic
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}
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/****************************************************************************
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* Name: efm32_dmastart
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*
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* Description:
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* Start the DMA transfer
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*
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* Assumptions:
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* - DMA handle allocated by efm32_dmachannel()
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* - No DMA in progress
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*
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****************************************************************************/
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void efm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg,
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bool half)
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{
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#warning Missing logic
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}
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/****************************************************************************
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* Name: efm32_dmastop
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*
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* Description:
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* Cancel the DMA. After efm32_dmastop() is called, the DMA channel is
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* reset and efm32_dmasetup() must be called before efm32_dmastart() can be
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* called again
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*
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* Assumptions:
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* - DMA handle allocated by efm32_dmachannel()
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*
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****************************************************************************/
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void efm32_dmastop(DMA_HANDLE handle)
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{
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#warning Missing logic
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}
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/****************************************************************************
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* Name: efm32_dmaresidual
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*
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* Description:
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* Returns the number of bytes remaining to be transferred
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*
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* Assumptions:
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* - DMA handle allocated by efm32_dmachannel()
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*
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****************************************************************************/
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size_t efm32_dmaresidual(DMA_HANDLE handle)
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{
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#warning Missing logic
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return 0;
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}
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/****************************************************************************
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* Name: efm32_dmacapable
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*
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* Description:
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* Check if the DMA controller can transfer data to/from given memory
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* address with the given configuration. This depends on the internal
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* connections in the ARM bus matrix of the processor. Note that this
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* only applies to memory addresses, it will return false for any peripheral
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* address.
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*
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* Returned value:
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* True, if transfer is possible.
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*
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****************************************************************************/
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#ifdef CONFIG_EFM32_DMACAPABLE
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bool efm32_dmacapable(uintptr_t maddr, uint32_t count, uint32_t ccr)
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{
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#warning Missing logic
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return false;
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}
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#endif
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/****************************************************************************
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* Name: efm32_dmasample
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*
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* Description:
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* Sample DMA register contents
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*
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* Assumptions:
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* - DMA handle allocated by efm32_dmachannel()
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*
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****************************************************************************/
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#ifdef CONFIG_DEBUG_DMA
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void efm32_dmasample(DMA_HANDLE handle, struct efm32_dmaregs_s *regs)
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{
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#warning Missing logic
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}
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#endif
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/****************************************************************************
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* Name: efm32_dmadump
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*
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* Description:
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* Dump previously sampled DMA register contents
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*
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* Assumptions:
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* - DMA handle allocated by efm32_dmachannel()
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*
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****************************************************************************/
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#ifdef CONFIG_DEBUG_DMA
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void efm32_dmadump(DMA_HANDLE handle, const struct efm32_dmaregs_s *regs,
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const char *msg)
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{
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#warning Missing logic
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}
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#endif
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@@ -0,0 +1,297 @@
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/************************************************************************************
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* arch/arm/src/efm32/efm32_dma.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
|
||||
* are met:
|
||||
*
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||||
* 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.
|
||||
*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_EFM32_EFM32_DMA_H
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#define __ARCH_ARM_SRC_EFM32_EFM32_DMA_H
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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 <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "chip.h"
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#include "chip/efm32_dma.h"
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/************************************************************************************
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* Public Types
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************************************************************************************/
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/* DMA_HANDLE provides an opaque are reference that can be used to represent a DMA
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* channel.
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*/
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typedef FAR void *DMA_HANDLE;
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/* Description:
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* This is the type of the callback that is used to inform the user of the the
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* completion of the DMA.
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*
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* Input Parameters:
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* handle - Refers tot he DMA channel or stream
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* status - A bit encoded value that provides the completion status. See the
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* DMASTATUS_* definitions above.
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* arg - A user-provided value that was provided when efm32_dmastart() was
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* called.
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*/
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typedef void (*dma_callback_t)(DMA_HANDLE handle, uint8_t status, void *arg);
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#ifdef CONFIG_DEBUG_DMA
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struct efm32_dmaregs_s
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{
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uint32_t status; /* DMA Status Registers */
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uint32_t ctrlbase; /* Channel Control Data Base Pointer Register */
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uint32_t altctrlbase; /* Channel Alternate Control Data Base Pointer Register */
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uint32_t chwaitstatus; /* Channel Wait on Request Status Register */
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uint32_t chusebursts; /* Channel Useburst Set Register */
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uint32_t chreqmasks; /* Channel Request Mask Set Register */
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uint32_t chens; /* Channel Enable Set Register */
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uint32_t chalts; /* Channel Alternate Set Register */
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uint32_t chpris; /* Channel Priority Set Register */
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uint32_t errorc; /* Bus Error Clear Register */
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uint32_t chreqstatus; /* Channel Request Status */
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uint32_t chsreqstatus; /* Channel Single Request Status */
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uint32_t ifr; /* Interrupt Flag Register */
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uint32_t ien; /* Interrupt Enable register */
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#if defined(CONFIG_EFM32_EFM32GG)
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uint32_t ctrl; /* DMA Control Register */
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uint32_t rds; /* DMA Retain Descriptor State */
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uint32_t loop0; /* Channel 0 Loop Register */
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uint32_t loop1; /* Channel 1 Loop Register */
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uint32_t rect0; /* Channel 0 Rectangle Register */
|
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#endif
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uint32_t chcgrl /* Channel n Control Register */
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};
|
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#endif
|
||||
|
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/************************************************************************************
|
||||
* Public Data
|
||||
************************************************************************************/
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
#define EXTERN extern "C"
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/************************************************************************************
|
||||
* Public Function Prototypes
|
||||
************************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmachannel
|
||||
*
|
||||
* Description:
|
||||
* Allocate a DMA channel. This function gives the caller mutually
|
||||
* exclusive access to the DMA channel specified by the 'chan' argument.
|
||||
* DMA channels are shared on the EFM32: Devices sharing the same DMA
|
||||
* channel cannot do DMA concurrently! See the DMACHAN_* definitions in
|
||||
* efm32_dma.h.
|
||||
*
|
||||
* If the DMA channel is not available, then efm32_dmachannel() will wait
|
||||
* until the holder of the channel relinquishes the channel by calling
|
||||
* efm32_dmafree(). WARNING: If you have two devices sharing a DMA
|
||||
* channel and the code never releases the channel, the efm32_dmachannel
|
||||
* call for the other will hang forever in this function! Don't let your
|
||||
* design do that!
|
||||
*
|
||||
* Hmm.. I suppose this interface could be extended to make a non-blocking
|
||||
* version. Feel free to do that if that is what you need.
|
||||
*
|
||||
* Input parameter:
|
||||
* chan - Identifies the channel resource
|
||||
*
|
||||
* Returned Value:
|
||||
* Provided that 'chan' is valid, this function ALWAYS returns a non-NULL,
|
||||
* void* DMA channel handle. (If 'chan' is invalid, the function will
|
||||
* assert if debug is enabled or do something ignorant otherwise).
|
||||
*
|
||||
* Assumptions:
|
||||
* - The caller does not hold he DMA channel.
|
||||
* - The caller can wait for the DMA channel to be freed if it is no
|
||||
* available.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
DMA_HANDLE efm32_dmachannel(unsigned int chan);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmafree
|
||||
*
|
||||
* Description:
|
||||
* Release a DMA channel. If another thread is waiting for this DMA channel
|
||||
* in a call to efm32_dmachannel, then this function will re-assign the
|
||||
* DMA channel to that thread and wake it up. NOTE: The 'handle' used
|
||||
* in this argument must NEVER be used again until efm32_dmachannel() is
|
||||
* called again to re-gain access to the channel.
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
* Assumptions:
|
||||
* - The caller holds the DMA channel.
|
||||
* - There is no DMA in progress
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void efm32_dmafree(DMA_HANDLE handle);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmasetup
|
||||
*
|
||||
* Description:
|
||||
* Configure DMA before using
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void efm32_dmasetup(DMA_HANDLE handle, uint32_t paddr, uint32_t maddr,
|
||||
size_t ntransfers, uint32_t ccr);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmastart
|
||||
*
|
||||
* Description:
|
||||
* Start the DMA transfer
|
||||
*
|
||||
* Assumptions:
|
||||
* - DMA handle allocated by efm32_dmachannel()
|
||||
* - No DMA in progress
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void efm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg,
|
||||
bool half);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmastop
|
||||
*
|
||||
* Description:
|
||||
* Cancel the DMA. After efm32_dmastop() is called, the DMA channel is
|
||||
* reset and efm32_dmasetup() must be called before efm32_dmastart() can be
|
||||
* called again
|
||||
*
|
||||
* Assumptions:
|
||||
* - DMA handle allocated by efm32_dmachannel()
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void efm32_dmastop(DMA_HANDLE handle);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmaresidual
|
||||
*
|
||||
* Description:
|
||||
* Returns the number of bytes remaining to be transferred
|
||||
*
|
||||
* Assumptions:
|
||||
* - DMA handle allocated by efm32_dmachannel()
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
size_t efm32_dmaresidual(DMA_HANDLE handle);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmacapable
|
||||
*
|
||||
* Description:
|
||||
* Check if the DMA controller can transfer data to/from given memory
|
||||
* address with the given configuration. This depends on the internal
|
||||
* connections in the ARM bus matrix of the processor. Note that this
|
||||
* only applies to memory addresses, it will return false for any peripheral
|
||||
* address.
|
||||
*
|
||||
* Returned value:
|
||||
* True, if transfer is possible.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_EFM32_DMACAPABLE
|
||||
bool efm32_dmacapable(uintptr_t maddr, uint32_t count, uint32_t ccr);
|
||||
#else
|
||||
# define efm32_dmacapable(maddr, count, ccr) (true)
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmasample
|
||||
*
|
||||
* Description:
|
||||
* Sample DMA register contents
|
||||
*
|
||||
* Assumptions:
|
||||
* - DMA handle allocated by efm32_dmachannel()
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_DEBUG_DMA
|
||||
void efm32_dmasample(DMA_HANDLE handle, struct efm32_dmaregs_s *regs);
|
||||
#else
|
||||
# define efm32_dmasample(handle,regs)
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: efm32_dmadump
|
||||
*
|
||||
* Description:
|
||||
* Dump previously sampled DMA register contents
|
||||
*
|
||||
* Assumptions:
|
||||
* - DMA handle allocated by efm32_dmachannel()
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_DEBUG_DMA
|
||||
void efm32_dmadump(DMA_HANDLE handle, const struct efm32_dmaregs_s *regs,
|
||||
const char *msg);
|
||||
#else
|
||||
# define efm32_dmadump(handle,regs,msg)
|
||||
#endif
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
#endif /* __ARCH_ARM_SRC_EFM32_EFM32_DMA_H */
|
||||
@@ -141,7 +141,8 @@ struct stm32_dmaregs_s
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
#define EXTERN extern "C"
|
||||
extern "C" {
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
@@ -189,7 +190,7 @@ extern "C" {
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
EXTERN DMA_HANDLE stm32_dmachannel(unsigned int chan);
|
||||
DMA_HANDLE stm32_dmachannel(unsigned int chan);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: stm32_dmafree
|
||||
@@ -329,4 +330,3 @@ void stm32_dmadump(DMA_HANDLE handle, const struct stm32_dmaregs_s *regs,
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
#endif /* __ARCH_ARM_SRC_STM32_STM32_DMA_H */
|
||||
|
||||
|
||||
Reference in New Issue
Block a user