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zephyr/drivers/dma/dma_xmc4xxx.c

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/*
* 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_en) {
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)
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