drivers/dma/dma_xmc4xxx.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2022 Andriy Gelman
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT infineon_xmc4xxx_dma

 #include <soc.h>
 #include <stdint.h>
 #include <xmc_dma.h>
 #include <zephyr/device.h>
 #include <zephyr/drivers/dma.h>
 #include <zephyr/dt-bindings/dma/infineon-xmc4xxx-dma.h>
 #include <zephyr/irq.h>

 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(dma_xmc4xxx, CONFIG_DMA_LOG_LEVEL);

 #define MAX_PRIORITY	  7
 #define DMA_MAX_BLOCK_LEN 4095
 #define DLR_LINE_UNSET	  0xff

 #define DLR_SRSEL_RS_BITSIZE 4
 #define DLR_SRSEL_RS_MSK     0xf

 #define ALL_EVENTS                                                                                 \
 	(XMC_DMA_CH_EVENT_TRANSFER_COMPLETE | XMC_DMA_CH_EVENT_BLOCK_TRANSFER_COMPLETE |           \
 	 XMC_DMA_CH_EVENT_SRC_TRANSACTION_COMPLETE | XMC_DMA_CH_EVENT_DST_TRANSACTION_COMPLETE |   \
 	 XMC_DMA_CH_EVENT_ERROR)

 struct dma_xmc4xxx_channel {
 	dma_callback_t cb;
 	void *user_data;
 	uint16_t block_ts;
 	uint8_t source_data_size;
 	uint8_t dlr_line;
 };

 struct dma_xmc4xxx_config {
 	XMC_DMA_t *dma;
 	void (*irq_configure)(void);
 };

 struct dma_xmc4xxx_data {
 	struct dma_context ctx;
 	struct dma_xmc4xxx_channel *channels;
 };

 #define HANDLE_EVENT(event_test, get_channels_event, ret)                                  \
 do {                                                                                       \
 	if (event & (XMC_DMA_CH_##event_test)) {                                           \
 		uint32_t channels_event = get_channels_event(dma);                         \
 		int channel = find_lsb_set(channels_event) - 1;                            \
 		struct dma_xmc4xxx_channel *dma_channel;                                   \
 											   \
 		__ASSERT_NO_MSG(channel >= 0);                                             \
 		dma_channel = &dev_data->channels[channel];                                \
 		/* Event has to be cleared before callback. The callback may call */       \
 		/* dma_start() and re-enable the event */                                  \
 		XMC_DMA_CH_ClearEventStatus(dma, channel, XMC_DMA_CH_##event_test);        \
 		if (dma_channel->cb) {                                                     \
 			dma_channel->cb(dev, dma_channel->user_data, channel, (ret));      \
 		}                                                                          \
 }                                                                                          \
 } while (0)

 /* Isr is level triggered, so we don't have to loop over all the channels */
 /* in a single call */
 static void dma_xmc4xxx_isr(const struct device *dev)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	int num_dma_channels = dev_data->ctx.dma_channels;
 	XMC_DMA_t *dma = dev_cfg->dma;
 	uint32_t event;
 	uint32_t sr_overruns;

 	/* There are two types of possible DMA error events: */
 	/* 1. Error response from AHB slave on the HRESP bus during DMA transfer. */
 	/*    Treat this as EPERM error. */
 	/* 2. Service request overruns on the DLR line. */
 	/*    Treat this EIO error. */

 	event = XMC_DMA_GetEventStatus(dma);
 	HANDLE_EVENT(EVENT_ERROR, XMC_DMA_GetChannelsErrorStatus, -EPERM);
 	HANDLE_EVENT(EVENT_BLOCK_TRANSFER_COMPLETE, XMC_DMA_GetChannelsBlockCompleteStatus, 0);
 	HANDLE_EVENT(EVENT_TRANSFER_COMPLETE, XMC_DMA_GetChannelsTransferCompleteStatus, 0);

 	sr_overruns = DLR->OVRSTAT;

 	if (sr_overruns == 0) {
 		return;
 	}

 	/* clear the overruns */
 	DLR->OVRCLR = sr_overruns;

 	/* notify about overruns */
 	for (int i = 0; i < num_dma_channels; i++) {
 		struct dma_xmc4xxx_channel *dma_channel;

 		dma_channel = &dev_data->channels[i];
 		if (dma_channel->cb && dma_channel->dlr_line != DLR_LINE_UNSET &&
 		    sr_overruns & BIT(dma_channel->dlr_line)) {

 			LOG_ERR("Overruns detected on channel %d", i);
 			dma_channel->cb(dev, dma_channel->user_data, i, -EIO);

 			/* From XMC4700/4800 reference documentation - Section 4.4.1 */
 			/* Once the overrun condition is entered the user can clear the */
 			/* overrun status bits by writing to the DLR_OVRCLR register. */
 			/* Additionally the pending request must be reset by successively */
 			/* disabling and enabling the respective line. */
 			DLR->LNEN &= ~BIT(dma_channel->dlr_line);
 			DLR->LNEN |= BIT(dma_channel->dlr_line);
 		}
 	}
 }

 static int dma_xmc4xxx_config(const struct device *dev, uint32_t channel, struct dma_config *config)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	struct dma_block_config *block = config->head_block;
 	XMC_DMA_t *dma = dev_cfg->dma;
 	uint8_t dlr_line = DLR_LINE_UNSET;

 	if (channel >= dev_data->ctx.dma_channels) {
 		LOG_ERR("Invalid channel number");
 		return -EINVAL;
 	}

 	if (config->channel_priority > MAX_PRIORITY) {
 		LOG_ERR("Invalid priority");
 		return -EINVAL;
 	}

 	if (config->source_chaining_en || config->dest_chaining_en) {
 		LOG_ERR("Channel chaining is not supported");
 		return -EINVAL;
 	}

 	if (config->channel_direction != MEMORY_TO_MEMORY &&
 	    config->channel_direction != MEMORY_TO_PERIPHERAL &&
 	    config->channel_direction != PERIPHERAL_TO_MEMORY) {
 		LOG_ERR("Unsupported channel direction");
 		return -EINVAL;
 	}

 	if (config->block_count != 1) {
 		LOG_ERR("Invalid block count");
 		return -EINVAL;
 	}

 	if (block->source_gather_en || block->dest_scatter_en) {
 		if (dma != XMC_DMA0 || channel >= 2) {
 			LOG_ERR("Gather/scatter only supported on DMA0 on ch0 and ch1");
 			return -EINVAL;
 		}
 	}

 	if (config->dest_data_size != 1 && config->dest_data_size != 2 &&
 	    config->dest_data_size != 4) {
 		LOG_ERR("Invalid dest size, Only 1,2,4 bytes supported");
 		return -EINVAL;
 	}

 	if (config->source_data_size != 1 && config->source_data_size != 2 &&
 	    config->source_data_size != 4) {
 		LOG_ERR("Invalid source size, Only 1,2,4 bytes supported");
 		return -EINVAL;
 	}

 	if (config->source_burst_length != 1 && config->source_burst_length != 4 &&
 	    config->source_burst_length != 8) {
 		LOG_ERR("Invalid src burst length (data size units). Only 1,4,8 units supported");
 		return -EINVAL;
 	}

 	if (config->dest_burst_length != 1 && config->dest_burst_length != 4 &&
 	    config->dest_burst_length != 8) {
 		LOG_ERR("Invalid dest burst length (data size units). Only 1,4,8 units supported");
 		return -EINVAL;
 	}

 	if (block->block_size / config->source_data_size > DMA_MAX_BLOCK_LEN) {
 		LOG_ERR("Block transactions must be <= 4095");
 		return -EINVAL;
 	}

 	if (XMC_DMA_CH_IsEnabled(dma, channel)) {
 		LOG_ERR("Channel is still active");
 		return -EINVAL;
 	}

 	XMC_DMA_CH_ClearEventStatus(dma, channel, ALL_EVENTS);

 	/* check dma slot number */
 	dma->CH[channel].SAR = block->source_address;
 	dma->CH[channel].DAR = block->dest_address;
 	dma->CH[channel].LLP = 0;

 	/* set number of transactions */
 	dma->CH[channel].CTLH = block->block_size / config->source_data_size;
 	/* set priority and software handshaking for src/dst. if hardware hankshaking is used */
 	/* it will be enabled later in the code */
 	dma->CH[channel].CFGL = (config->channel_priority << GPDMA0_CH_CFGL_CH_PRIOR_Pos) |
 				GPDMA0_CH_CFGL_HS_SEL_SRC_Msk | GPDMA0_CH_CFGL_HS_SEL_DST_Msk;

 	dma->CH[channel].CTLL = config->dest_data_size / 2 << GPDMA0_CH_CTLL_DST_TR_WIDTH_Pos |
 				config->source_data_size / 2 << GPDMA0_CH_CTLL_SRC_TR_WIDTH_Pos |
 				block->dest_addr_adj << GPDMA0_CH_CTLL_DINC_Pos |
 				block->source_addr_adj << GPDMA0_CH_CTLL_SINC_Pos |
 				config->dest_burst_length / 4 << GPDMA0_CH_CTLL_DEST_MSIZE_Pos |
 				config->source_burst_length / 4 << GPDMA0_CH_CTLL_SRC_MSIZE_Pos |
 				BIT(GPDMA0_CH_CTLL_INT_EN_Pos);

 	if (config->channel_direction == MEMORY_TO_PERIPHERAL ||
 	    config->channel_direction == PERIPHERAL_TO_MEMORY) {
 		uint8_t request_source = XMC4XXX_DMA_GET_REQUEST_SOURCE(config->dma_slot);
 		uint8_t dlr_line_reg = XMC4XXX_DMA_GET_LINE(config->dma_slot);

 		dlr_line = dlr_line_reg;
 		if (dma == XMC_DMA0 && dlr_line > 7) {
 			LOG_ERR("Unsupported request line %d for DMA0."
 					"Should be in range [0,7]", dlr_line);
 			return -EINVAL;
 		}

 		if (dma == XMC_DMA1 && (dlr_line < 8 || dlr_line > 11)) {
 			LOG_ERR("Unsupported request line %d for DMA1."
 					"Should be in range [8,11]", dlr_line);
 			return -EINVAL;
 		}

 		/* clear any overruns */
 		DLR->OVRCLR = BIT(dlr_line);
 		/* enable the dma line */
 		DLR->LNEN &= ~BIT(dlr_line);
 		DLR->LNEN |= BIT(dlr_line);

 		/* connect DMA Line to SR */
 		if (dma == XMC_DMA0) {
 			DLR->SRSEL0 &= ~(DLR_SRSEL_RS_MSK << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE));
 			DLR->SRSEL0 |= request_source << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE);
 		}

 		if (dma == XMC_DMA1) {
 			dlr_line_reg -= 8;
 			DLR->SRSEL1 &= ~(DLR_SRSEL_RS_MSK << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE));
 			DLR->SRSEL1 |= request_source << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE);
 		}

 		/* connect DMA channel to DMA line */
 		if (config->channel_direction == MEMORY_TO_PERIPHERAL) {
 			dma->CH[channel].CFGH = (dlr_line_reg << GPDMA0_CH_CFGH_DEST_PER_Pos) | 4;
 			dma->CH[channel].CFGL &= ~BIT(GPDMA0_CH_CFGL_HS_SEL_DST_Pos);
 			dma->CH[channel].CTLL |= 1 << GPDMA0_CH_CTLL_TT_FC_Pos;
 		}

 		if (config->channel_direction == PERIPHERAL_TO_MEMORY) {
 			dma->CH[channel].CFGH = (dlr_line_reg << GPDMA0_CH_CFGH_SRC_PER_Pos) | 4;
 			dma->CH[channel].CFGL &= ~BIT(GPDMA0_CH_CFGL_HS_SEL_SRC_Pos);
 			dma->CH[channel].CTLL |= 2 << GPDMA0_CH_CTLL_TT_FC_Pos;
 		}
 	}

 	if (block->source_gather_en) {
 		dma->CH[channel].CTLL |= BIT(GPDMA0_CH_CTLL_SRC_GATHER_EN_Pos);
 		/* truncate if we are out of range */
 		dma->CH[channel].SGR = (block->source_gather_interval & GPDMA0_CH_SGR_SGI_Msk) |
 				       block->source_gather_count << GPDMA0_CH_SGR_SGC_Pos;
 	}

 	if (block->dest_scatter_en) {
 		dma->CH[channel].CTLL |= BIT(GPDMA0_CH_CTLL_DST_SCATTER_EN_Pos);
 		/* truncate if we are out of range */
 		dma->CH[channel].DSR = (block->dest_scatter_interval & GPDMA0_CH_DSR_DSI_Msk) |
 				       block->dest_scatter_count << GPDMA0_CH_DSR_DSC_Pos;
 	}

 	dev_data->channels[channel].cb = config->dma_callback;
 	dev_data->channels[channel].user_data = config->user_data;
 	dev_data->channels[channel].block_ts = block->block_size / config->source_data_size;
 	dev_data->channels[channel].source_data_size = config->source_data_size;
 	dev_data->channels[channel].dlr_line = dlr_line;

 	XMC_DMA_CH_DisableEvent(dma, channel, ALL_EVENTS);
 	XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_TRANSFER_COMPLETE);

 	/* trigger enable on block transfer complete */
 	if (config->complete_callback_en) {
 		XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_BLOCK_TRANSFER_COMPLETE);
 	}

 	if (!config->error_callback_dis) {
 		XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_ERROR);
 	}

 	LOG_DBG("Configured channel %d for %08X to %08X (%u)", channel, block->source_address,
 		block->dest_address, block->block_size);

 	return 0;
 }

 static int dma_xmc4xxx_start(const struct device *dev, uint32_t channel)
 {
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;

 	LOG_DBG("Starting channel %d", channel);
 	XMC_DMA_CH_Enable(dev_cfg->dma, channel);
 	return 0;
 }

 static int dma_xmc4xxx_stop(const struct device *dev, uint32_t channel)
 {
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	struct dma_xmc4xxx_channel *dma_channel;
 	XMC_DMA_t *dma = dev_cfg->dma;

 	dma_channel = &dev_data->channels[channel];
 	XMC_DMA_CH_Suspend(dma, channel);

 	/* wait until ongoing transfer finishes */
 	while (XMC_DMA_CH_IsEnabled(dma, channel) &&
 	      (dma->CH[channel].CFGL & GPDMA0_CH_CFGL_FIFO_EMPTY_Msk) == 0) {
 	}

 	/* disconnect DLR line to stop overuns */
 	if (dma_channel->dlr_line != DLR_LINE_UNSET) {
 		DLR->LNEN &= ~BIT(dma_channel->dlr_line);
 	}

 	dma_channel->dlr_line = DLR_LINE_UNSET;
 	dma_channel->cb = NULL;

 	XMC_DMA_CH_Disable(dma, channel);
 	return 0;
 }

 static int dma_xmc4xxx_reload(const struct device *dev, uint32_t channel, uint32_t src,
 			      uint32_t dst, size_t size)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	size_t block_ts;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	XMC_DMA_t *dma = dev_cfg->dma;
 	struct dma_xmc4xxx_channel *dma_channel;

 	if (channel >= dev_data->ctx.dma_channels) {
 		LOG_ERR("Invalid channel number");
 		return -EINVAL;
 	}

 	if (XMC_DMA_CH_IsEnabled(dma, channel)) {
 		LOG_ERR("Channel is still active");
 		return -EINVAL;
 	}

 	dma_channel = &dev_data->channels[channel];
 	block_ts = size / dma_channel->source_data_size;
 	if (block_ts > DMA_MAX_BLOCK_LEN) {
 		LOG_ERR("Block transactions must be <= 4095");
 		return -EINVAL;
 	}
 	dma_channel->block_ts = block_ts;

 	/* do we need to clear any errors */
 	dma->CH[channel].SAR = src;
 	dma->CH[channel].DAR = dst;
 	dma->CH[channel].CTLH = block_ts;

 	return 0;
 }

 static int dma_xmc4xxx_get_status(const struct device *dev, uint32_t channel,
 				  struct dma_status *stat)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	XMC_DMA_t *dma = dev_cfg->dma;
 	struct dma_xmc4xxx_channel *dma_channel;

 	if (channel >= dev_data->ctx.dma_channels) {
 		LOG_ERR("Invalid channel number");
 		return -EINVAL;
 	}
 	dma_channel = &dev_data->channels[channel];

 	stat->busy = XMC_DMA_CH_IsEnabled(dma, channel);

 	stat->pending_length  = dma_channel->block_ts - XMC_DMA_CH_GetTransferredData(dma, channel);
 	stat->pending_length *= dma_channel->source_data_size;
 	/* stat->dir and other remaining fields are not set. They are are not */
 	/* useful for xmc4xxx peripheral drivers. */

 	return 0;
 }

 static bool dma_xmc4xxx_chan_filter(const struct device *dev, int channel, void *filter_param)
 {
 	uint32_t requested_channel;

 	if (!filter_param) {
 		return true;
 	}

 	requested_channel = *(uint32_t *)filter_param;

 	if (channel == requested_channel) {
 		return true;
 	}

 	return false;
 }

 static int dma_xmc4xxx_suspend(const struct device *dev, uint32_t channel)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	XMC_DMA_t *dma = dev_cfg->dma;

 	if (channel >= dev_data->ctx.dma_channels) {
 		LOG_ERR("Invalid channel number");
 		return -EINVAL;
 	}

 	XMC_DMA_CH_Suspend(dma, channel);
 	return 0;
 }

 static int dma_xmc4xxx_resume(const struct device *dev, uint32_t channel)
 {
 	struct dma_xmc4xxx_data *dev_data = dev->data;
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
 	XMC_DMA_t *dma = dev_cfg->dma;

 	if (channel >= dev_data->ctx.dma_channels) {
 		LOG_ERR("Invalid channel number");
 		return -EINVAL;
 	}

 	XMC_DMA_CH_Resume(dma, channel);
 	return 0;
 }

 static int dma_xmc4xxx_init(const struct device *dev)
 {
 	const struct dma_xmc4xxx_config *dev_cfg = dev->config;

 	XMC_DMA_Enable(dev_cfg->dma);
 	dev_cfg->irq_configure();
 	return 0;
 }

 static const struct dma_driver_api dma_xmc4xxx_driver_api = {
 	.config = dma_xmc4xxx_config,
 	.reload = dma_xmc4xxx_reload,
 	.start = dma_xmc4xxx_start,
 	.stop = dma_xmc4xxx_stop,
 	.get_status = dma_xmc4xxx_get_status,
 	.chan_filter = dma_xmc4xxx_chan_filter,
 	.suspend = dma_xmc4xxx_suspend,
 	.resume = dma_xmc4xxx_resume,
 };

 #define XMC4XXX_DMA_INIT(inst)                                                  \
 	static void dma_xmc4xxx##inst##_irq_configure(void)                     \
 	{                                                                       \
 		IRQ_CONNECT(DT_INST_IRQ_BY_IDX(inst, 0, irq),                   \
 			    DT_INST_IRQ_BY_IDX(inst, 0, priority),              \
 			    dma_xmc4xxx_isr,                                    \
 			    DEVICE_DT_INST_GET(inst), 0);                       \
 		irq_enable(DT_INST_IRQ_BY_IDX(inst, 0, irq));                   \
 	}                                                                       \
 	static const struct dma_xmc4xxx_config dma_xmc4xxx##inst##_config = {   \
 		.dma = (XMC_DMA_t *)DT_INST_REG_ADDR(inst),                     \
 		.irq_configure = dma_xmc4xxx##inst##_irq_configure,             \
 	};                                                                      \
 										\
 	static struct dma_xmc4xxx_channel                                       \
 		dma_xmc4xxx##inst##_channels[DT_INST_PROP(inst, dma_channels)]; \
 	ATOMIC_DEFINE(dma_xmc4xxx_atomic##inst,                                 \
 		      DT_INST_PROP(inst, dma_channels));                        \
 	static struct dma_xmc4xxx_data dma_xmc4xxx##inst##_data = {             \
 		.ctx =  {                                                       \
 			.magic = DMA_MAGIC,                                     \
 			.atomic = dma_xmc4xxx_atomic##inst,                     \
 			.dma_channels = DT_INST_PROP(inst, dma_channels),       \
 		},                                                              \
 		.channels = dma_xmc4xxx##inst##_channels,                       \
 	};                                                                      \
 										\
 	DEVICE_DT_INST_DEFINE(inst, &dma_xmc4xxx_init, NULL,                    \
 			      &dma_xmc4xxx##inst##_data,                        \
 			      &dma_xmc4xxx##inst##_config, PRE_KERNEL_1,        \
 			      CONFIG_DMA_INIT_PRIORITY, &dma_xmc4xxx_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(XMC4XXX_DMA_INIT)
	/*
	* Copyright (c) 2022 Andriy Gelman
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT infineon_xmc4xxx_dma

	#include <soc.h>
	#include <stdint.h>
	#include <xmc_dma.h>
	#include <zephyr/device.h>
	#include <zephyr/drivers/dma.h>
	#include <zephyr/dt-bindings/dma/infineon-xmc4xxx-dma.h>
	#include <zephyr/irq.h>

	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(dma_xmc4xxx, CONFIG_DMA_LOG_LEVEL);

	#define MAX_PRIORITY 7
	#define DMA_MAX_BLOCK_LEN 4095
	#define DLR_LINE_UNSET 0xff

	#define DLR_SRSEL_RS_BITSIZE 4
	#define DLR_SRSEL_RS_MSK 0xf

	#define ALL_EVENTS \
	(XMC_DMA_CH_EVENT_TRANSFER_COMPLETE \| XMC_DMA_CH_EVENT_BLOCK_TRANSFER_COMPLETE \| \
	XMC_DMA_CH_EVENT_SRC_TRANSACTION_COMPLETE \| XMC_DMA_CH_EVENT_DST_TRANSACTION_COMPLETE \| \
	XMC_DMA_CH_EVENT_ERROR)

	struct dma_xmc4xxx_channel {
	dma_callback_t cb;
	void *user_data;
	uint16_t block_ts;
	uint8_t source_data_size;
	uint8_t dlr_line;
	};

	struct dma_xmc4xxx_config {
	XMC_DMA_t *dma;
	void (*irq_configure)(void);
	};

	struct dma_xmc4xxx_data {
	struct dma_context ctx;
	struct dma_xmc4xxx_channel *channels;
	};

	#define HANDLE_EVENT(event_test, get_channels_event, ret) \
	do { \
	if (event & (XMC_DMA_CH_##event_test)) { \
	uint32_t channels_event = get_channels_event(dma); \
	int channel = find_lsb_set(channels_event) - 1; \
	struct dma_xmc4xxx_channel *dma_channel; \
	\
	__ASSERT_NO_MSG(channel >= 0); \
	dma_channel = &dev_data->channels[channel]; \
	/* Event has to be cleared before callback. The callback may call */ \
	/* dma_start() and re-enable the event */ \
	XMC_DMA_CH_ClearEventStatus(dma, channel, XMC_DMA_CH_##event_test); \
	if (dma_channel->cb) { \
	dma_channel->cb(dev, dma_channel->user_data, channel, (ret)); \
	} \
	} \
	} while (0)

	/* Isr is level triggered, so we don't have to loop over all the channels */
	/* in a single call */
	static void dma_xmc4xxx_isr(const struct device *dev)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	int num_dma_channels = dev_data->ctx.dma_channels;
	XMC_DMA_t *dma = dev_cfg->dma;
	uint32_t event;
	uint32_t sr_overruns;

	/* There are two types of possible DMA error events: */
	/* 1. Error response from AHB slave on the HRESP bus during DMA transfer. */
	/* Treat this as EPERM error. */
	/* 2. Service request overruns on the DLR line. */
	/* Treat this EIO error. */

	event = XMC_DMA_GetEventStatus(dma);
	HANDLE_EVENT(EVENT_ERROR, XMC_DMA_GetChannelsErrorStatus, -EPERM);
	HANDLE_EVENT(EVENT_BLOCK_TRANSFER_COMPLETE, XMC_DMA_GetChannelsBlockCompleteStatus, 0);
	HANDLE_EVENT(EVENT_TRANSFER_COMPLETE, XMC_DMA_GetChannelsTransferCompleteStatus, 0);

	sr_overruns = DLR->OVRSTAT;

	if (sr_overruns == 0) {
	return;
	}

	/* clear the overruns */
	DLR->OVRCLR = sr_overruns;

	/* notify about overruns */
	for (int i = 0; i < num_dma_channels; i++) {
	struct dma_xmc4xxx_channel *dma_channel;

	dma_channel = &dev_data->channels[i];
	if (dma_channel->cb && dma_channel->dlr_line != DLR_LINE_UNSET &&
	sr_overruns & BIT(dma_channel->dlr_line)) {

	LOG_ERR("Overruns detected on channel %d", i);
	dma_channel->cb(dev, dma_channel->user_data, i, -EIO);

	/* From XMC4700/4800 reference documentation - Section 4.4.1 */
	/* Once the overrun condition is entered the user can clear the */
	/* overrun status bits by writing to the DLR_OVRCLR register. */
	/* Additionally the pending request must be reset by successively */
	/* disabling and enabling the respective line. */
	DLR->LNEN &= ~BIT(dma_channel->dlr_line);
	DLR->LNEN \|= BIT(dma_channel->dlr_line);
	}
	}
	}

	static int dma_xmc4xxx_config(const struct device dev, uint32_t channel, struct dma_config config)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	struct dma_block_config *block = config->head_block;
	XMC_DMA_t *dma = dev_cfg->dma;
	uint8_t dlr_line = DLR_LINE_UNSET;

	if (channel >= dev_data->ctx.dma_channels) {
	LOG_ERR("Invalid channel number");
	return -EINVAL;
	}

	if (config->channel_priority > MAX_PRIORITY) {
	LOG_ERR("Invalid priority");
	return -EINVAL;
	}

	if (config->source_chaining_en \|\| config->dest_chaining_en) {
	LOG_ERR("Channel chaining is not supported");
	return -EINVAL;
	}

	if (config->channel_direction != MEMORY_TO_MEMORY &&
	config->channel_direction != MEMORY_TO_PERIPHERAL &&
	config->channel_direction != PERIPHERAL_TO_MEMORY) {
	LOG_ERR("Unsupported channel direction");
	return -EINVAL;
	}

	if (config->block_count != 1) {
	LOG_ERR("Invalid block count");
	return -EINVAL;
	}

	if (block->source_gather_en \|\| block->dest_scatter_en) {
	if (dma != XMC_DMA0 \|\| channel >= 2) {
	LOG_ERR("Gather/scatter only supported on DMA0 on ch0 and ch1");
	return -EINVAL;
	}
	}

	if (config->dest_data_size != 1 && config->dest_data_size != 2 &&
	config->dest_data_size != 4) {
	LOG_ERR("Invalid dest size, Only 1,2,4 bytes supported");
	return -EINVAL;
	}

	if (config->source_data_size != 1 && config->source_data_size != 2 &&
	config->source_data_size != 4) {
	LOG_ERR("Invalid source size, Only 1,2,4 bytes supported");
	return -EINVAL;
	}

	if (config->source_burst_length != 1 && config->source_burst_length != 4 &&
	config->source_burst_length != 8) {
	LOG_ERR("Invalid src burst length (data size units). Only 1,4,8 units supported");
	return -EINVAL;
	}

	if (config->dest_burst_length != 1 && config->dest_burst_length != 4 &&
	config->dest_burst_length != 8) {
	LOG_ERR("Invalid dest burst length (data size units). Only 1,4,8 units supported");
	return -EINVAL;
	}

	if (block->block_size / config->source_data_size > DMA_MAX_BLOCK_LEN) {
	LOG_ERR("Block transactions must be <= 4095");
	return -EINVAL;
	}

	if (XMC_DMA_CH_IsEnabled(dma, channel)) {
	LOG_ERR("Channel is still active");
	return -EINVAL;
	}

	XMC_DMA_CH_ClearEventStatus(dma, channel, ALL_EVENTS);

	/* check dma slot number */
	dma->CH[channel].SAR = block->source_address;
	dma->CH[channel].DAR = block->dest_address;
	dma->CH[channel].LLP = 0;

	/* set number of transactions */
	dma->CH[channel].CTLH = block->block_size / config->source_data_size;
	/* set priority and software handshaking for src/dst. if hardware hankshaking is used */
	/* it will be enabled later in the code */
	dma->CH[channel].CFGL = (config->channel_priority << GPDMA0_CH_CFGL_CH_PRIOR_Pos) \|
	GPDMA0_CH_CFGL_HS_SEL_SRC_Msk \| GPDMA0_CH_CFGL_HS_SEL_DST_Msk;

	dma->CH[channel].CTLL = config->dest_data_size / 2 << GPDMA0_CH_CTLL_DST_TR_WIDTH_Pos \|
	config->source_data_size / 2 << GPDMA0_CH_CTLL_SRC_TR_WIDTH_Pos \|
	block->dest_addr_adj << GPDMA0_CH_CTLL_DINC_Pos \|
	block->source_addr_adj << GPDMA0_CH_CTLL_SINC_Pos \|
	config->dest_burst_length / 4 << GPDMA0_CH_CTLL_DEST_MSIZE_Pos \|
	config->source_burst_length / 4 << GPDMA0_CH_CTLL_SRC_MSIZE_Pos \|
	BIT(GPDMA0_CH_CTLL_INT_EN_Pos);

	if (config->channel_direction == MEMORY_TO_PERIPHERAL \|\|
	config->channel_direction == PERIPHERAL_TO_MEMORY) {
	uint8_t request_source = XMC4XXX_DMA_GET_REQUEST_SOURCE(config->dma_slot);
	uint8_t dlr_line_reg = XMC4XXX_DMA_GET_LINE(config->dma_slot);

	dlr_line = dlr_line_reg;
	if (dma == XMC_DMA0 && dlr_line > 7) {
	LOG_ERR("Unsupported request line %d for DMA0."
	"Should be in range [0,7]", dlr_line);
	return -EINVAL;
	}

	if (dma == XMC_DMA1 && (dlr_line < 8 \|\| dlr_line > 11)) {
	LOG_ERR("Unsupported request line %d for DMA1."
	"Should be in range [8,11]", dlr_line);
	return -EINVAL;
	}

	/* clear any overruns */
	DLR->OVRCLR = BIT(dlr_line);
	/* enable the dma line */
	DLR->LNEN &= ~BIT(dlr_line);
	DLR->LNEN \|= BIT(dlr_line);

	/* connect DMA Line to SR */
	if (dma == XMC_DMA0) {
	DLR->SRSEL0 &= ~(DLR_SRSEL_RS_MSK << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE));
	DLR->SRSEL0 \|= request_source << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE);
	}

	if (dma == XMC_DMA1) {
	dlr_line_reg -= 8;
	DLR->SRSEL1 &= ~(DLR_SRSEL_RS_MSK << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE));
	DLR->SRSEL1 \|= request_source << (dlr_line_reg * DLR_SRSEL_RS_BITSIZE);
	}

	/* connect DMA channel to DMA line */
	if (config->channel_direction == MEMORY_TO_PERIPHERAL) {
	dma->CH[channel].CFGH = (dlr_line_reg << GPDMA0_CH_CFGH_DEST_PER_Pos) \| 4;
	dma->CH[channel].CFGL &= ~BIT(GPDMA0_CH_CFGL_HS_SEL_DST_Pos);
	dma->CH[channel].CTLL \|= 1 << GPDMA0_CH_CTLL_TT_FC_Pos;
	}

	if (config->channel_direction == PERIPHERAL_TO_MEMORY) {
	dma->CH[channel].CFGH = (dlr_line_reg << GPDMA0_CH_CFGH_SRC_PER_Pos) \| 4;
	dma->CH[channel].CFGL &= ~BIT(GPDMA0_CH_CFGL_HS_SEL_SRC_Pos);
	dma->CH[channel].CTLL \|= 2 << GPDMA0_CH_CTLL_TT_FC_Pos;
	}
	}

	if (block->source_gather_en) {
	dma->CH[channel].CTLL \|= BIT(GPDMA0_CH_CTLL_SRC_GATHER_EN_Pos);
	/* truncate if we are out of range */
	dma->CH[channel].SGR = (block->source_gather_interval & GPDMA0_CH_SGR_SGI_Msk) \|
	block->source_gather_count << GPDMA0_CH_SGR_SGC_Pos;
	}

	if (block->dest_scatter_en) {
	dma->CH[channel].CTLL \|= BIT(GPDMA0_CH_CTLL_DST_SCATTER_EN_Pos);
	/* truncate if we are out of range */
	dma->CH[channel].DSR = (block->dest_scatter_interval & GPDMA0_CH_DSR_DSI_Msk) \|
	block->dest_scatter_count << GPDMA0_CH_DSR_DSC_Pos;
	}

	dev_data->channels[channel].cb = config->dma_callback;
	dev_data->channels[channel].user_data = config->user_data;
	dev_data->channels[channel].block_ts = block->block_size / config->source_data_size;
	dev_data->channels[channel].source_data_size = config->source_data_size;
	dev_data->channels[channel].dlr_line = dlr_line;

	XMC_DMA_CH_DisableEvent(dma, channel, ALL_EVENTS);
	XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_TRANSFER_COMPLETE);

	/* trigger enable on block transfer complete */
	if (config->complete_callback_en) {
	XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_BLOCK_TRANSFER_COMPLETE);
	}

	if (!config->error_callback_dis) {
	XMC_DMA_CH_EnableEvent(dma, channel, XMC_DMA_CH_EVENT_ERROR);
	}

	LOG_DBG("Configured channel %d for %08X to %08X (%u)", channel, block->source_address,
	block->dest_address, block->block_size);

	return 0;
	}

	static int dma_xmc4xxx_start(const struct device *dev, uint32_t channel)
	{
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;

	LOG_DBG("Starting channel %d", channel);
	XMC_DMA_CH_Enable(dev_cfg->dma, channel);
	return 0;
	}

	static int dma_xmc4xxx_stop(const struct device *dev, uint32_t channel)
	{
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	struct dma_xmc4xxx_data *dev_data = dev->data;
	struct dma_xmc4xxx_channel *dma_channel;
	XMC_DMA_t *dma = dev_cfg->dma;

	dma_channel = &dev_data->channels[channel];
	XMC_DMA_CH_Suspend(dma, channel);

	/* wait until ongoing transfer finishes */
	while (XMC_DMA_CH_IsEnabled(dma, channel) &&
	(dma->CH[channel].CFGL & GPDMA0_CH_CFGL_FIFO_EMPTY_Msk) == 0) {
	}

	/* disconnect DLR line to stop overuns */
	if (dma_channel->dlr_line != DLR_LINE_UNSET) {
	DLR->LNEN &= ~BIT(dma_channel->dlr_line);
	}

	dma_channel->dlr_line = DLR_LINE_UNSET;
	dma_channel->cb = NULL;

	XMC_DMA_CH_Disable(dma, channel);
	return 0;
	}

	static int dma_xmc4xxx_reload(const struct device *dev, uint32_t channel, uint32_t src,
	uint32_t dst, size_t size)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	size_t block_ts;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	XMC_DMA_t *dma = dev_cfg->dma;
	struct dma_xmc4xxx_channel *dma_channel;

	if (channel >= dev_data->ctx.dma_channels) {
	LOG_ERR("Invalid channel number");
	return -EINVAL;
	}

	if (XMC_DMA_CH_IsEnabled(dma, channel)) {
	LOG_ERR("Channel is still active");
	return -EINVAL;
	}

	dma_channel = &dev_data->channels[channel];
	block_ts = size / dma_channel->source_data_size;
	if (block_ts > DMA_MAX_BLOCK_LEN) {
	LOG_ERR("Block transactions must be <= 4095");
	return -EINVAL;
	}
	dma_channel->block_ts = block_ts;

	/* do we need to clear any errors */
	dma->CH[channel].SAR = src;
	dma->CH[channel].DAR = dst;
	dma->CH[channel].CTLH = block_ts;

	return 0;
	}

	static int dma_xmc4xxx_get_status(const struct device *dev, uint32_t channel,
	struct dma_status *stat)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	XMC_DMA_t *dma = dev_cfg->dma;
	struct dma_xmc4xxx_channel *dma_channel;

	if (channel >= dev_data->ctx.dma_channels) {
	LOG_ERR("Invalid channel number");
	return -EINVAL;
	}
	dma_channel = &dev_data->channels[channel];

	stat->busy = XMC_DMA_CH_IsEnabled(dma, channel);

	stat->pending_length = dma_channel->block_ts - XMC_DMA_CH_GetTransferredData(dma, channel);
	stat->pending_length *= dma_channel->source_data_size;
	/* stat->dir and other remaining fields are not set. They are are not */
	/* useful for xmc4xxx peripheral drivers. */

	return 0;
	}

	static bool dma_xmc4xxx_chan_filter(const struct device dev, int channel, void filter_param)
	{
	uint32_t requested_channel;

	if (!filter_param) {
	return true;
	}

	requested_channel = (uint32_t )filter_param;

	if (channel == requested_channel) {
	return true;
	}

	return false;
	}

	static int dma_xmc4xxx_suspend(const struct device *dev, uint32_t channel)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	XMC_DMA_t *dma = dev_cfg->dma;

	if (channel >= dev_data->ctx.dma_channels) {
	LOG_ERR("Invalid channel number");
	return -EINVAL;
	}

	XMC_DMA_CH_Suspend(dma, channel);
	return 0;
	}

	static int dma_xmc4xxx_resume(const struct device *dev, uint32_t channel)
	{
	struct dma_xmc4xxx_data *dev_data = dev->data;
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;
	XMC_DMA_t *dma = dev_cfg->dma;

	if (channel >= dev_data->ctx.dma_channels) {
	LOG_ERR("Invalid channel number");
	return -EINVAL;
	}

	XMC_DMA_CH_Resume(dma, channel);
	return 0;
	}

	static int dma_xmc4xxx_init(const struct device *dev)
	{
	const struct dma_xmc4xxx_config *dev_cfg = dev->config;

	XMC_DMA_Enable(dev_cfg->dma);
	dev_cfg->irq_configure();
	return 0;
	}

	static const struct dma_driver_api dma_xmc4xxx_driver_api = {
	.config = dma_xmc4xxx_config,
	.reload = dma_xmc4xxx_reload,
	.start = dma_xmc4xxx_start,
	.stop = dma_xmc4xxx_stop,
	.get_status = dma_xmc4xxx_get_status,
	.chan_filter = dma_xmc4xxx_chan_filter,
	.suspend = dma_xmc4xxx_suspend,
	.resume = dma_xmc4xxx_resume,
	};

	#define XMC4XXX_DMA_INIT(inst) \
	static void dma_xmc4xxx##inst##_irq_configure(void) \
	{ \
	IRQ_CONNECT(DT_INST_IRQ_BY_IDX(inst, 0, irq), \
	DT_INST_IRQ_BY_IDX(inst, 0, priority), \
	dma_xmc4xxx_isr, \
	DEVICE_DT_INST_GET(inst), 0); \
	irq_enable(DT_INST_IRQ_BY_IDX(inst, 0, irq)); \
	} \
	static const struct dma_xmc4xxx_config dma_xmc4xxx##inst##_config = { \
	.dma = (XMC_DMA_t *)DT_INST_REG_ADDR(inst), \
	.irq_configure = dma_xmc4xxx##inst##_irq_configure, \
	}; \
	\
	static struct dma_xmc4xxx_channel \
	dma_xmc4xxx##inst##_channels[DT_INST_PROP(inst, dma_channels)]; \
	ATOMIC_DEFINE(dma_xmc4xxx_atomic##inst, \
	DT_INST_PROP(inst, dma_channels)); \
	static struct dma_xmc4xxx_data dma_xmc4xxx##inst##_data = { \
	.ctx = { \
	.magic = DMA_MAGIC, \
	.atomic = dma_xmc4xxx_atomic##inst, \
	.dma_channels = DT_INST_PROP(inst, dma_channels), \
	}, \
	.channels = dma_xmc4xxx##inst##_channels, \
	}; \
	\
	DEVICE_DT_INST_DEFINE(inst, &dma_xmc4xxx_init, NULL, \
	&dma_xmc4xxx##inst##_data, \
	&dma_xmc4xxx##inst##_config, PRE_KERNEL_1, \
	CONFIG_DMA_INIT_PRIORITY, &dma_xmc4xxx_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(XMC4XXX_DMA_INIT)