| /* |
| * Copyright (c) 2015, Freescale Semiconductor, Inc. |
| * Copyright 2016-2017 NXP |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * o Redistributions of source code must retain the above copyright notice, this list |
| * of conditions and the following disclaimer. |
| * |
| * o 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. |
| * |
| * o Neither the name of the copyright holder 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 HOLDER 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. |
| */ |
| |
| #include "fsl_spi_dma.h" |
| |
| /******************************************************************************* |
| * Definitons |
| ******************************************************************************/ |
| /*<! Structure definition for spi_dma_private_handle_t. The structure is private. */ |
| typedef struct _spi_dma_private_handle |
| { |
| SPI_Type *base; |
| spi_dma_handle_t *handle; |
| } spi_dma_private_handle_t; |
| |
| /*! @brief SPI transfer state, which is used for SPI transactiaonl APIs' internal state. */ |
| enum _spi_dma_states_t |
| { |
| kSPI_Idle = 0x0, /*!< SPI is idle state */ |
| kSPI_Busy /*!< SPI is busy tranferring data. */ |
| }; |
| |
| /*<! Private handle only used for internally. */ |
| static spi_dma_private_handle_t s_dmaPrivateHandle[FSL_FEATURE_SOC_SPI_COUNT]; |
| /******************************************************************************* |
| * Prototypes |
| ******************************************************************************/ |
| /*! |
| * @brief Get the instance for SPI module. |
| * |
| * @param base SPI base address |
| */ |
| extern uint32_t SPI_GetInstance(SPI_Type *base); |
| |
| /*! |
| * @brief DMA callback function for SPI send transfer. |
| * |
| * @param handle DMA handle pointer. |
| * @param userData User data for DMA callback function. |
| */ |
| static void SPI_TxDMACallback(dma_handle_t *handle, void *userData); |
| |
| /*! |
| * @brief DMA callback function for SPI receive transfer. |
| * |
| * @param handle DMA handle pointer. |
| * @param userData User data for DMA callback function. |
| */ |
| static void SPI_RxDMACallback(dma_handle_t *handle, void *userData); |
| |
| /******************************************************************************* |
| * Variables |
| ******************************************************************************/ |
| |
| /* Dummy data used to send */ |
| static const uint8_t s_dummyData = SPI_DUMMYDATA; |
| |
| /******************************************************************************* |
| * Code |
| ******************************************************************************/ |
| static void SPI_TxDMACallback(dma_handle_t *handle, void *userData) |
| { |
| spi_dma_private_handle_t *privHandle = (spi_dma_private_handle_t *)userData; |
| spi_dma_handle_t *spiHandle = privHandle->handle; |
| SPI_Type *base = privHandle->base; |
| |
| /* Disable Tx dma */ |
| SPI_EnableDMA(base, kSPI_TxDmaEnable, false); |
| |
| /* Stop DMA tranfer */ |
| DMA_StopTransfer(spiHandle->txHandle); |
| |
| /* change the state */ |
| spiHandle->txInProgress = false; |
| |
| /* All finished, call the callback */ |
| if ((spiHandle->txInProgress == false) && (spiHandle->rxInProgress == false)) |
| { |
| spiHandle->state = kSPI_Idle; |
| if (spiHandle->callback) |
| { |
| (spiHandle->callback)(base, spiHandle, kStatus_Success, spiHandle->userData); |
| } |
| } |
| } |
| |
| static void SPI_RxDMACallback(dma_handle_t *handle, void *userData) |
| { |
| spi_dma_private_handle_t *privHandle = (spi_dma_private_handle_t *)userData; |
| spi_dma_handle_t *spiHandle = privHandle->handle; |
| SPI_Type *base = privHandle->base; |
| |
| /* Disable Tx dma */ |
| SPI_EnableDMA(base, kSPI_RxDmaEnable, false); |
| |
| /* Stop DMA tranfer */ |
| DMA_StopTransfer(spiHandle->rxHandle); |
| |
| /* change the state */ |
| spiHandle->rxInProgress = false; |
| |
| /* All finished, call the callback */ |
| if ((spiHandle->txInProgress == false) && (spiHandle->rxInProgress == false)) |
| { |
| spiHandle->state = kSPI_Idle; |
| if (spiHandle->callback) |
| { |
| (spiHandle->callback)(base, spiHandle, kStatus_Success, spiHandle->userData); |
| } |
| } |
| } |
| |
| void SPI_MasterTransferCreateHandleDMA(SPI_Type *base, |
| spi_dma_handle_t *handle, |
| spi_dma_callback_t callback, |
| void *userData, |
| dma_handle_t *txHandle, |
| dma_handle_t *rxHandle) |
| { |
| assert(handle); |
| dma_transfer_config_t config = {0}; |
| uint32_t instance = SPI_GetInstance(base); |
| |
| /* Zero the handle */ |
| memset(handle, 0, sizeof(*handle)); |
| |
| /* Set spi base to handle */ |
| handle->txHandle = txHandle; |
| handle->rxHandle = rxHandle; |
| handle->callback = callback; |
| handle->userData = userData; |
| |
| /* Set SPI state to idle */ |
| handle->state = kSPI_Idle; |
| |
| /* Set handle to global state */ |
| s_dmaPrivateHandle[instance].base = base; |
| s_dmaPrivateHandle[instance].handle = handle; |
| |
| /* Compute internal state */ |
| #if defined(FSL_FEATURE_SPI_16BIT_TRANSFERS) && (FSL_FEATURE_SPI_16BIT_TRANSFERS) |
| handle->bytesPerFrame = ((base->C2 & SPI_C2_SPIMODE_MASK) >> SPI_C2_SPIMODE_SHIFT) + 1U; |
| #else |
| handle->bytesPerFrame = 1U; |
| #endif /* FSL_FEATURE_SPI_16BIT_TRANSFERS */ |
| |
| #if defined(FSL_FEATURE_SPI_HAS_FIFO) && (FSL_FEATURE_SPI_HAS_FIFO) |
| /* If using DMA, disable FIFO, as the FIFO may cause data loss if the data size is not integer |
| times of 2bytes. As SPI cannot set watermark to 0, only can set to 1/2 FIFO size or 3/4 FIFO |
| size. */ |
| if (FSL_FEATURE_SPI_FIFO_SIZEn(base) != 0) |
| { |
| base->C3 &= ~SPI_C3_FIFOMODE_MASK; |
| } |
| |
| #endif /* FSL_FEATURE_SPI_HAS_FIFO */ |
| |
| /* Set the non-change attribute for Tx DMA transfer, to improve efficiency */ |
| config.destAddr = SPI_GetDataRegisterAddress(base); |
| config.enableDestIncrement = false; |
| config.enableSrcIncrement = true; |
| if (handle->bytesPerFrame == 1U) |
| { |
| config.srcSize = kDMA_Transfersize8bits; |
| config.destSize = kDMA_Transfersize8bits; |
| } |
| else |
| { |
| config.srcSize = kDMA_Transfersize16bits; |
| config.destSize = kDMA_Transfersize16bits; |
| } |
| |
| DMA_SubmitTransfer(handle->txHandle, &config, true); |
| |
| /* Set non-change attribute for Rx DMA */ |
| config.srcAddr = SPI_GetDataRegisterAddress(base); |
| config.destAddr = 0U; |
| config.enableDestIncrement = true; |
| config.enableSrcIncrement = false; |
| DMA_SubmitTransfer(handle->rxHandle, &config, true); |
| |
| /* Install callback for Tx dma channel */ |
| DMA_SetCallback(handle->txHandle, SPI_TxDMACallback, &s_dmaPrivateHandle[instance]); |
| DMA_SetCallback(handle->rxHandle, SPI_RxDMACallback, &s_dmaPrivateHandle[instance]); |
| } |
| |
| status_t SPI_MasterTransferDMA(SPI_Type *base, spi_dma_handle_t *handle, spi_transfer_t *xfer) |
| { |
| assert(handle && xfer); |
| |
| dma_transfer_config_t config = {0}; |
| |
| /* Check if the device is busy */ |
| if (handle->state == kSPI_Busy) |
| { |
| return kStatus_SPI_Busy; |
| } |
| |
| /* Check if input parameter invalid */ |
| if (((xfer->txData == NULL) && (xfer->rxData == NULL)) || (xfer->dataSize == 0U)) |
| { |
| return kStatus_InvalidArgument; |
| } |
| |
| /* Disable SPI and then enable it, this is used to clear S register*/ |
| SPI_Enable(base, false); |
| SPI_Enable(base, true); |
| |
| /* Configure tx transfer DMA */ |
| config.destAddr = SPI_GetDataRegisterAddress(base); |
| config.enableDestIncrement = false; |
| if (handle->bytesPerFrame == 1U) |
| { |
| config.srcSize = kDMA_Transfersize8bits; |
| config.destSize = kDMA_Transfersize8bits; |
| } |
| else |
| { |
| config.srcSize = kDMA_Transfersize16bits; |
| config.destSize = kDMA_Transfersize16bits; |
| } |
| config.transferSize = xfer->dataSize; |
| /* Configure DMA channel */ |
| if (xfer->txData) |
| { |
| config.enableSrcIncrement = true; |
| config.srcAddr = (uint32_t)(xfer->txData); |
| } |
| else |
| { |
| /* Disable the source increasement and source set to dummyData */ |
| config.enableSrcIncrement = false; |
| config.srcAddr = (uint32_t)(&s_dummyData); |
| } |
| DMA_SubmitTransfer(handle->txHandle, &config, true); |
| |
| /* Handle rx transfer */ |
| if (xfer->rxData) |
| { |
| /* Set the source address */ |
| DMA_SetDestinationAddress(handle->rxHandle->base, handle->rxHandle->channel, (uint32_t)(xfer->rxData)); |
| |
| /* Set the transfer size */ |
| DMA_SetTransferSize(handle->rxHandle->base, handle->rxHandle->channel, xfer->dataSize); |
| } |
| |
| /* Change the state of handle */ |
| handle->transferSize = xfer->dataSize; |
| handle->state = kSPI_Busy; |
| |
| /* Start Rx transfer if needed */ |
| if (xfer->rxData) |
| { |
| handle->rxInProgress = true; |
| SPI_EnableDMA(base, kSPI_RxDmaEnable, true); |
| DMA_StartTransfer(handle->rxHandle); |
| } |
| |
| /* Always start Tx transfer */ |
| handle->txInProgress = true; |
| SPI_EnableDMA(base, kSPI_TxDmaEnable, true); |
| DMA_StartTransfer(handle->txHandle); |
| |
| return kStatus_Success; |
| } |
| |
| status_t SPI_MasterTransferGetCountDMA(SPI_Type *base, spi_dma_handle_t *handle, size_t *count) |
| { |
| assert(handle); |
| |
| status_t status = kStatus_Success; |
| |
| if (handle->state != kSPI_Busy) |
| { |
| status = kStatus_NoTransferInProgress; |
| } |
| else |
| { |
| if (handle->rxInProgress) |
| { |
| *count = handle->transferSize - DMA_GetRemainingBytes(handle->rxHandle->base, handle->rxHandle->channel); |
| } |
| else |
| { |
| *count = handle->transferSize - DMA_GetRemainingBytes(handle->txHandle->base, handle->txHandle->channel); |
| } |
| } |
| |
| return status; |
| } |
| |
| void SPI_MasterTransferAbortDMA(SPI_Type *base, spi_dma_handle_t *handle) |
| { |
| assert(handle); |
| |
| /* Disable dma */ |
| DMA_StopTransfer(handle->txHandle); |
| DMA_StopTransfer(handle->rxHandle); |
| |
| /* Disable DMA enable bit */ |
| SPI_EnableDMA(base, kSPI_DmaAllEnable, false); |
| |
| /* Set the handle state */ |
| handle->txInProgress = false; |
| handle->rxInProgress = false; |
| handle->state = kSPI_Idle; |
| } |