EFM32: dma_config_t needs to be only 16-bits for now
This commit is contained in:
Gregory Nutt
parent
d4f35ba41c
commit
562b719f26
@ -53,7 +53,8 @@
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* Pre-processor Definitions
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************************************************************************************/
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/* Bit encoded input parameter to efm32_channel()
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/* Bit encoded input parameter to efm32_channel(). These encodings must fit in the
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* an unsigned integer of type dma_config_t.
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*
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* Current limitations/assumptions in the encoding:
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*
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@ -76,9 +77,9 @@
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# define EFM32_DMA_XFERSIZE_SHIFT_HWORD (1 << EFM32_DMA_SOURCSEL_SHIFT)
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# define EFM32_DMA_XFERSIZE_SHIFT_WORD (2 << EFM32_DMA_SOURCSEL_SHIFT)
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#define EFM32_DMA_SINGLE_MASK (1 << 12) /* Bit 12: Single or Buffer full request */
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# define EFM32_DMA_SINGLE (1 << 12) /* 1=Buffer full request */
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# define EFM32_DMA_BUFFER_FULL (0) /* 0=Buffer full request */
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#define EFM32_DMA_SINGLE_MASK (1 << 12) /* Bit 12: Single or Buffer full request */
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# define EFM32_DMA_SINGLE (1 << 12) /* 1=Buffer full request */
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# define EFM32_DMA_BUFFER_FULL (0) /* 0=Buffer full request */
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/************************************************************************************
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* Public Types
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@ -132,9 +133,12 @@ struct efm32_dmaregs_s
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};
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#endif
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/* Type of 'config' argument passed to efm32_rxdmasetup() and efm32_txdmasetup */
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/* Type of 'config' argument passed to efm32_rxdmasetup() and efm32_txdmasetup.
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* See EFM32_DMA_* encodings above. If these encodings exceed 16-bits, then this
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* should be changed to a uint32_t.
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*/
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typedef uint32_t dma_config_t;
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typedef uint16_t dma_config_t;
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/************************************************************************************
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* Public Data
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@ -155,16 +159,15 @@ extern "C"
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* Public Function Prototypes
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************************************************************************************/
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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 a DMA channel.
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* Allocate a DMA channel. This function gives the caller mutually exclusive
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* access to a DMA channel.
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*
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* If no DMA channel is available, then efm32_dmachannel() will wait
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* until the holder of a channel relinquishes the channel by calling
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* efm32_dmafree().
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* If no DMA channel is available, then efm32_dmachannel() will wait until the
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* holder of a channel relinquishes the channel by calling efm32_dmafree().
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*
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* Input parameters:
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* None
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@ -173,22 +176,21 @@ extern "C"
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* This function ALWAYS returns a non-NULL, void* DMA channel handle.
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*
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* Assumptions:
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* - The caller can wait for a DMA channel to be freed if it is not
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* available.
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* - The caller can wait for a DMA channel to be freed if it is not available.
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*
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****************************************************************************/
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************************************************************************************/
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DMA_HANDLE efm32_dmachannel(void);
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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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* Release a DMA channel. If another thread is waiting for this DMA channel in a
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* call to efm32_dmachannel, then this function will re-assign the DMA channel to
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* that thread and wake it up. NOTE: The 'handle' used in this argument must
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* NEVER be used again until efm32_dmachannel() is called again to re-gain access
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* to the channel.
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*
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* Returned Value:
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* None
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@ -197,11 +199,11 @@ DMA_HANDLE efm32_dmachannel(void);
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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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************************************************************************************/
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void efm32_dmafree(DMA_HANDLE handle);
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/****************************************************************************
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/************************************************************************************
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* Name: efm32_rxdmasetup
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*
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* Description:
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@ -214,12 +216,12 @@ void efm32_dmafree(DMA_HANDLE handle);
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* configured transfer size.
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* config - Channel configuration selections
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*
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****************************************************************************/
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************************************************************************************/
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void efm32_rxdmasetup(DMA_HANDLE handle, uintptr_t paddr, uintptr_t maddr,
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size_t nbytes, dma_config_t config);
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/****************************************************************************
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/************************************************************************************
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* Name: efm32_txdmasetup
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*
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* Description:
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@ -232,12 +234,12 @@ void efm32_rxdmasetup(DMA_HANDLE handle, uintptr_t paddr, uintptr_t maddr,
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* configured transfer size.
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* config - Channel configuration selections
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*
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****************************************************************************/
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************************************************************************************/
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void efm32_txdmasetup(DMA_HANDLE handle, uintptr_t paddr, uintptr_t maddr,
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size_t nbytes, dma_config_t config);
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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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@ -247,26 +249,25 @@ void efm32_txdmasetup(DMA_HANDLE handle, uintptr_t paddr, uintptr_t maddr,
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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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************************************************************************************/
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void efm32_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg);
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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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* Cancel the DMA. After efm32_dmastop() is called, the DMA channel is reset and
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* efm32_dmasetup() must be called before efm32_dmastart() can be 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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************************************************************************************/
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void efm32_dmastop(DMA_HANDLE handle);
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/****************************************************************************
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/************************************************************************************
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* Name: efm32_dmasample
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*
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* Description:
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@ -275,7 +276,7 @@ void efm32_dmastop(DMA_HANDLE handle);
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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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************************************************************************************/
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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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@ -283,7 +284,7 @@ void efm32_dmasample(DMA_HANDLE handle, struct efm32_dmaregs_s *regs);
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# define efm32_dmasample(handle,regs)
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#endif
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/****************************************************************************
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/************************************************************************************
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* Name: efm32_dmadump
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*
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* Description:
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@ -292,7 +293,7 @@ void efm32_dmasample(DMA_HANDLE handle, struct efm32_dmaregs_s *regs);
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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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************************************************************************************/
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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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