drivers: i2s: i2s_stm32_sai add support for stm32l4xx

xxx

Signed-off-by: Mario Paja <[email protected]>

Author: mariopaja

drivers/i2s/i2s_stm32_sai.c

@@ -285,12 +285,18 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 
 #if defined(CONFIG_SOC_SERIES_STM32H7X)
 	hdma->Instance = __LL_DMA_GET_STREAM_INSTANCE(stream->reg, stream->dma_channel);
+	hdma->Init.FIFOMode = DMA_FIFOMODE_DISABLE;
+#elif defined(CONFIG_SOC_SERIES_STM32L4X)
+	hdma->Instance = __LL_DMA_GET_CHANNEL_INSTANCE(stream->reg, (stream->dma_channel - 1));
+#else
+	hdma->Instance = LL_DMA_GET_CHANNEL_INSTANCE(stream->reg, stream->dma_channel);
+#endif
+
+#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_SOC_SERIES_STM32L4X)
 	hdma->Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
 	hdma->Init.MemDataAlignment = DMA_PDATAALIGN_HALFWORD;
 	hdma->Init.Priority = DMA_PRIORITY_HIGH;
-	hdma->Init.FIFOMode = DMA_FIFOMODE_DISABLE;
 #else
-	hdma->Instance = LL_DMA_GET_CHANNEL_INSTANCE(stream->reg, stream->dma_channel);
 	hdma->Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
 	hdma->Init.SrcDataWidth = DMA_SRC_DATAWIDTH_HALFWORD;
 	hdma->Init.DestDataWidth = DMA_DEST_DATAWIDTH_HALFWORD;
@@ -302,12 +308,14 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 #endif
 
 	hdma->Init.Request = dma_cfg.dma_slot;
+	/* L4 how to get the request */
+	hdma->Init.Request = DMA_REQUEST_1;
 	hdma->Init.Mode = DMA_NORMAL;
 
 	if (stream->dma_cfg.channel_direction == (enum dma_channel_direction)MEMORY_TO_PERIPHERAL) {
 		hdma->Init.Direction = DMA_MEMORY_TO_PERIPH;
 
-#if defined(CONFIG_SOC_SERIES_STM32H7X)
+#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_SOC_SERIES_STM32L4X)
 		hdma->Init.PeriphInc = DMA_PINC_DISABLE;
 		hdma->Init.MemInc = DMA_MINC_ENABLE;
 #else
@@ -319,7 +327,7 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 	} else {
 		hdma->Init.Direction = DMA_PERIPH_TO_MEMORY;
 
-#if defined(CONFIG_SOC_SERIES_STM32H7X)
+#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_SOC_SERIES_STM32L4X)
 		hdma->Init.PeriphInc = DMA_PINC_ENABLE;
 		hdma->Init.MemInc = DMA_MINC_DISABLE;
 #else
@@ -341,7 +349,7 @@ static int i2s_stm32_sai_dma_init(const struct device *dev)
 		LOG_ERR("HAL_DMA_ConfigChannelAttributes: <Failed>");
 		return -EIO;
 	}
-#elif !defined(CONFIG_SOC_SERIES_STM32H7X)
+#elif !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_SOC_SERIES_STM32L4X)
 	if (HAL_DMA_ConfigChannelAttributes(&dev_data->hdma, DMA_CHANNEL_NPRIV) != HAL_OK) {
 		LOG_ERR("HAL_DMA_ConfigChannelAttributes: <Failed>");
 		return -EIO;
@@ -400,6 +408,7 @@ static void dma_callback(const struct device *dma_dev, void *arg, uint32_t chann
 	DMA_HandleTypeDef *hdma = arg;
 
 	ARG_UNUSED(dma_dev);
+	LOG_WRN("dma_callback");
 
 	if (status < 0) {
 		LOG_ERR("DMA callback error with channel %d.", channel);
@@ -456,21 +465,28 @@ static int i2s_stm32_sai_configure(const struct device *dev, enum i2s_dir dir,
 		return -EINVAL;
 	}
 
+	/* Not possible to control MCLK output from SAI configuration */
+#if !defined(CONFIG_SOC_SERIES_STM32L4X)
 	if (cfg->mclk_enable && stream->master) {
 		hsai->Init.MckOutput = SAI_MCK_OUTPUT_ENABLE;
 	} else {
 		hsai->Init.MckOutput = SAI_MCK_OUTPUT_DISABLE;
 	}
+#endif
 
 	if (cfg->mclk_div == (enum mclk_divider)MCLK_NO_DIV) {
 		hsai->Init.NoDivider = SAI_MASTERDIVIDER_DISABLED;
 	} else {
 		hsai->Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
+
+		/* MckOverSampling is not supported by all STM32L4xx MCUs */
+#if !defined(CONFIG_SOC_SERIES_STM32L4X)
 		if (cfg->mclk_div == (enum mclk_divider)MCLK_DIV_256) {
 			hsai->Init.MckOverSampling = SAI_MCK_OVERSAMPLING_DISABLE;
 		} else {
 			hsai->Init.MckOverSampling = SAI_MCK_OVERSAMPLING_ENABLE;
 		}
+#endif
 	}
 
 	/* AudioFrequency */