drivers: dma: sam: support different num of channels for each instance

As the number of DMA channels could be different between DMA instances,
get the number from "XDMAC Global Type Register" and validate the
channel used.

Signed-off-by: Tony Han <tony.han@microchip.com>

Author: TonyHan11

drivers/dma/dma_sam_xdmac.c

@@ -26,7 +26,7 @@
 LOG_MODULE_REGISTER(dma_sam_xdmac);
 
 #define XDMAC_INT_ERR (XDMAC_CIE_RBIE | XDMAC_CIE_WBIE | XDMAC_CIE_ROIE)
-#define DMA_CHANNELS_NO  XDMACCHID_NUMBER
+#define DMA_CHANNELS_MAX 31
 
 /* DMA channel configuration */
 struct sam_xdmac_channel_cfg {
@@ -45,13 +45,15 @@ struct sam_xdmac_dev_cfg {
 
 /* Device run time data */
 struct sam_xdmac_dev_data {
-	struct sam_xdmac_channel_cfg dma_channels[DMA_CHANNELS_NO];
+	struct dma_context dma_ctx;
+	struct sam_xdmac_channel_cfg dma_channels[DMA_CHANNELS_MAX + 1];
 };
 
 static void sam_xdmac_isr(const struct device *dev)
 {
 	const struct sam_xdmac_dev_cfg *const dev_cfg = dev->config;
 	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 
 	Xdmac * const xdmac = dev_cfg->regs;
 	struct sam_xdmac_channel_cfg *channel_cfg;
@@ -61,7 +63,7 @@ static void sam_xdmac_isr(const struct device *dev)
 	/* Get global interrupt status */
 	isr_status = xdmac->XDMAC_GIS;
 
-	for (int channel = 0; channel < DMA_CHANNELS_NO; channel++) {
+	for (int channel = 0; channel < channel_num; channel++) {
 		if (!(isr_status & (1 << channel))) {
 			continue;
 		}
@@ -83,10 +85,13 @@ int sam_xdmac_channel_configure(const struct device *dev, uint32_t channel,
 				struct sam_xdmac_channel_config *param)
 {
 	const struct sam_xdmac_dev_cfg *const dev_cfg = dev->config;
+	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 
 	Xdmac * const xdmac = dev_cfg->regs;
 
-	if (channel >= DMA_CHANNELS_NO) {
+	if (channel >= channel_num) {
+		LOG_ERR("Channel %d out of range", channel);
 		return -EINVAL;
 	}
 
@@ -126,10 +131,13 @@ int sam_xdmac_transfer_configure(const struct device *dev, uint32_t channel,
 				 struct sam_xdmac_transfer_config *param)
 {
 	const struct sam_xdmac_dev_cfg *const dev_cfg = dev->config;
+	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 
 	Xdmac * const xdmac = dev_cfg->regs;
 
-	if (channel >= DMA_CHANNELS_NO) {
+	if (channel >= channel_num) {
+		LOG_ERR("Channel %d out of range", channel);
 		return -EINVAL;
 	}
 
@@ -179,13 +187,15 @@ static int sam_xdmac_config(const struct device *dev, uint32_t channel,
 			    struct dma_config *cfg)
 {
 	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 	struct sam_xdmac_channel_config channel_cfg;
 	struct sam_xdmac_transfer_config transfer_cfg;
 	uint32_t burst_size;
 	uint32_t data_size;
 	int ret;
 
-	if (channel >= DMA_CHANNELS_NO) {
+	if (channel >= channel_num) {
+		LOG_ERR("Channel %d out of range", channel);
 		return -EINVAL;
 	}
 
@@ -300,11 +310,13 @@ static int sam_xdmac_transfer_reload(const struct device *dev, uint32_t channel,
 int sam_xdmac_transfer_start(const struct device *dev, uint32_t channel)
 {
 	const struct sam_xdmac_dev_cfg *config = dev->config;
+	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 
 	Xdmac * const xdmac = config->regs;
 
-	if (channel >= DMA_CHANNELS_NO) {
-		LOG_DBG("Channel %d out of range", channel);
+	if (channel >= channel_num) {
+		LOG_ERR("Channel %d out of range", channel);
 		return -EINVAL;
 	}
 
@@ -325,10 +337,13 @@ int sam_xdmac_transfer_start(const struct device *dev, uint32_t channel)
 int sam_xdmac_transfer_stop(const struct device *dev, uint32_t channel)
 {
 	const struct sam_xdmac_dev_cfg *config = dev->config;
+	struct sam_xdmac_dev_data *const dev_data = dev->data;
+	uint32_t channel_num = dev_data->dma_ctx.dma_channels;
 
 	Xdmac * const xdmac = config->regs;
 
-	if (channel >= DMA_CHANNELS_NO) {
+	if (channel >= channel_num) {
+		LOG_ERR("Channel %d out of range", channel);
 		return -EINVAL;
 	}
 
@@ -352,9 +367,16 @@ int sam_xdmac_transfer_stop(const struct device *dev, uint32_t channel)
 static int sam_xdmac_initialize(const struct device *dev)
 {
 	const struct sam_xdmac_dev_cfg *const dev_cfg = dev->config;
+	struct sam_xdmac_dev_data *const dev_data = dev->data;
 
 	Xdmac * const xdmac = dev_cfg->regs;
 
+	dev_data->dma_ctx.dma_channels = FIELD_GET(XDMAC_GTYPE_NB_CH_Msk, xdmac->XDMAC_GTYPE) + 1;
+	if (dev_data->dma_ctx.dma_channels > DMA_CHANNELS_MAX + 1) {
+		LOG_ERR("Maximum supported channels is %d", DMA_CHANNELS_MAX + 1);
+		return -EINVAL;
+	}
+
 	/* Configure interrupts */
 	dev_cfg->irq_config();
 
@@ -421,7 +443,12 @@ static DEVICE_API(dma, sam_xdmac_driver_api) = {
 		.irq_id = DT_INST_IRQN(n),					\
 	};									\
 										\
-	static struct sam_xdmac_dev_data dma##n##_data;				\
+	static ATOMIC_DEFINE(dma_channels_atomic_##n, DMA_CHANNELS_MAX);	\
+										\
+	static struct sam_xdmac_dev_data dma##n##_data = {			\
+		.dma_ctx.magic = DMA_MAGIC,					\
+		.dma_ctx.atomic = dma_channels_atomic_##n,			\
+	};									\
 										\
 	DEVICE_DT_INST_DEFINE(n, &sam_xdmac_initialize, NULL,			\
 			      &dma##n##_data, &dma##n##_config, POST_KERNEL,	\