65434f58dd
- Fix GPIO CS timing when using DMA. When using GPIO CS the CS select was enabled after the DMA started the transfer, resulting in the first few bits being transfered while CS was still disabled. - Fix TX or RX only DMA transfers. When only a RX or only a TX transfer was requested the DMA never finished. For the RX only cause the size on the transfer was calculated by taking the TX buffer length (0), this caused problems. For the TX only transfer the RX buffer was set to NULL, this caused the DMA to acctually writing data to the adress 0x00000000. By using the dummy destination buffer it now only writes to valid memory. - Add semaphore to signal that DMA is ready, instead of just busy waiting. Signed-off-by: Erwin Rol <erwin@erwinrol.com>
192 lines
4.1 KiB
C
192 lines
4.1 KiB
C
/*
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* Copyright (c) 2016 BayLibre, SAS
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_SPI_SPI_LL_STM32_H_
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#define ZEPHYR_DRIVERS_SPI_SPI_LL_STM32_H_
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#include "spi_context.h"
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typedef void (*irq_config_func_t)(const struct device *port);
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struct spi_stm32_config {
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struct stm32_pclken pclken;
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SPI_TypeDef *spi;
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#ifdef CONFIG_SPI_STM32_INTERRUPT
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irq_config_func_t irq_config;
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#endif
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};
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#ifdef CONFIG_SPI_STM32_DMA
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#define SPI_STM32_DMA_ERROR_FLAG 0x01
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#define SPI_STM32_DMA_RX_DONE_FLAG 0x02
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#define SPI_STM32_DMA_TX_DONE_FLAG 0x04
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#define SPI_STM32_DMA_DONE_FLAG \
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(SPI_STM32_DMA_RX_DONE_FLAG | SPI_STM32_DMA_TX_DONE_FLAG)
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struct stream {
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const char *dma_name;
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const struct device *dma_dev;
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uint32_t channel; /* stores the channel for dma or mux */
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struct dma_config dma_cfg;
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struct dma_block_config dma_blk_cfg;
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uint8_t priority;
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bool src_addr_increment;
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bool dst_addr_increment;
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int fifo_threshold;
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};
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#endif
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struct spi_stm32_data {
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struct spi_context ctx;
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#ifdef CONFIG_SPI_STM32_DMA
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struct k_sem status_sem;
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volatile uint32_t status_flags;
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struct stream dma_rx;
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struct stream dma_tx;
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#endif
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};
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static inline uint32_t ll_func_tx_is_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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return LL_SPI_IsActiveFlag_TXP(spi);
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#else
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return LL_SPI_IsActiveFlag_TXE(spi);
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#endif
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}
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static inline uint32_t ll_func_rx_is_not_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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return LL_SPI_IsActiveFlag_RXP(spi);
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#else
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return LL_SPI_IsActiveFlag_RXNE(spi);
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#endif
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}
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static inline void ll_func_enable_int_tx_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_EnableIT_TXP(spi);
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#else
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LL_SPI_EnableIT_TXE(spi);
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#endif
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}
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static inline void ll_func_enable_int_rx_not_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_EnableIT_RXP(spi);
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#else
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LL_SPI_EnableIT_RXNE(spi);
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#endif
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}
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static inline void ll_func_enable_int_errors(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_EnableIT_UDR(spi);
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LL_SPI_EnableIT_OVR(spi);
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LL_SPI_EnableIT_CRCERR(spi);
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LL_SPI_EnableIT_FRE(spi);
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LL_SPI_EnableIT_MODF(spi);
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#else
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LL_SPI_EnableIT_ERR(spi);
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#endif
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}
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static inline void ll_func_disable_int_tx_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_DisableIT_TXP(spi);
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#else
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LL_SPI_DisableIT_TXE(spi);
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#endif
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}
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static inline void ll_func_disable_int_rx_not_empty(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_DisableIT_RXP(spi);
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#else
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LL_SPI_DisableIT_RXNE(spi);
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#endif
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}
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static inline void ll_func_disable_int_errors(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_DisableIT_UDR(spi);
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LL_SPI_DisableIT_OVR(spi);
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LL_SPI_DisableIT_CRCERR(spi);
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LL_SPI_DisableIT_FRE(spi);
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LL_SPI_DisableIT_MODF(spi);
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#else
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LL_SPI_DisableIT_ERR(spi);
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#endif
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}
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static inline uint32_t ll_func_spi_is_busy(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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return (!LL_SPI_IsActiveFlag_MODF(spi) &&
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!LL_SPI_IsActiveFlag_TXC(spi));
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#else
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return LL_SPI_IsActiveFlag_BSY(spi);
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#endif
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}
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/* Header is compiled first, this switch avoid the compiler to lookup for
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* non-existing LL FIFO functions for SoC without SPI FIFO
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*/
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#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_spi_fifo)
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static inline void ll_func_set_fifo_threshold_8bit(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_SetFIFOThreshold(spi, LL_SPI_FIFO_TH_01DATA);
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#else
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LL_SPI_SetRxFIFOThreshold(spi, LL_SPI_RX_FIFO_TH_QUARTER);
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#endif
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}
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static inline void ll_func_set_fifo_threshold_16bit(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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LL_SPI_SetFIFOThreshold(spi, LL_SPI_FIFO_TH_02DATA);
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#else
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LL_SPI_SetRxFIFOThreshold(spi, LL_SPI_RX_FIFO_TH_HALF);
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#endif
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}
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#endif
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static inline void ll_func_disable_spi(SPI_TypeDef *spi)
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{
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#ifdef CONFIG_SOC_SERIES_STM32MP1X
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if (LL_SPI_IsActiveMasterTransfer(spi)) {
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LL_SPI_SuspendMasterTransfer(spi);
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while (LL_SPI_IsActiveMasterTransfer(spi)) {
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/* NOP */
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}
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}
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LL_SPI_Disable(spi);
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while (LL_SPI_IsEnabled(spi)) {
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/* NOP */
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}
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/* Flush RX buffer */
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while (LL_SPI_IsActiveFlag_RXP(spi)) {
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(void)LL_SPI_ReceiveData8(spi);
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}
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LL_SPI_ClearFlag_SUSP(spi);
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#else
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LL_SPI_Disable(spi);
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#endif
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}
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#endif /* ZEPHYR_DRIVERS_SPI_SPI_LL_STM32_H_ */
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