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drivers: spi: stm32h7: Use SPI FIFO

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Allow to use H7 SPI FIFO to improve performance.

SPI FIFO usage can be enabled/disabled from devicetree.

Signed-off-by: Daniel Gaston Ochoa <dgastonochoa@gmail.com>
This commit is contained in:
Daniel Gaston Ochoa 2023-12-27 21:25:39 +00:00 committed by Fabio Baltieri
parent eb78d4dfde
commit 9991d2ba65
1 changed files with 35 additions and 18 deletions
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53
drivers/spi/spi_ll_stm32.c
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@ -338,20 +338,36 @@ static int spi_stm32_get_err(SPI_TypeDef *spi)
return 0;
}
/* Shift a SPI frame as master. */
static void spi_stm32_shift_m(SPI_TypeDef *spi, struct spi_stm32_data *data)
static void spi_stm32_shift_fifo(SPI_TypeDef *spi, struct spi_stm32_data *data)
{
while (!ll_func_tx_is_not_full(spi)) {
/* NOP */
if (ll_func_rx_is_not_empty(spi)) {
spi_stm32_read_next_frame(spi, data);
}
spi_stm32_send_next_frame(spi, data);
while (!ll_func_rx_is_not_empty(spi)) {
/* NOP */
if (ll_func_tx_is_not_full(spi)) {
spi_stm32_send_next_frame(spi, data);
}
}
spi_stm32_read_next_frame(spi, data);
/* Shift a SPI frame as master. */
static void spi_stm32_shift_m(const struct spi_stm32_config *cfg,
struct spi_stm32_data *data)
{
if (cfg->fifo_enabled) {
spi_stm32_shift_fifo(cfg->spi, data);
} else {
while (!ll_func_tx_is_not_full(cfg->spi)) {
/* NOP */
}
spi_stm32_send_next_frame(cfg->spi, data);
while (!ll_func_rx_is_not_empty(cfg->spi)) {
/* NOP */
}
spi_stm32_read_next_frame(cfg->spi, data);
}
}
/* Shift a SPI frame as slave. */
@ -395,17 +411,18 @@ static void spi_stm32_shift_s(SPI_TypeDef *spi, struct spi_stm32_data *data)
*
* TODO: support 16-bit data frames.
*/
static int spi_stm32_shift_frames(SPI_TypeDef *spi, struct spi_stm32_data *data)
static int spi_stm32_shift_frames(const struct spi_stm32_config *cfg,
struct spi_stm32_data *data)
{
uint16_t operation = data->ctx.config->operation;
if (SPI_OP_MODE_GET(operation) == SPI_OP_MODE_MASTER) {
spi_stm32_shift_m(spi, data);
spi_stm32_shift_m(cfg, data);
} else {
spi_stm32_shift_s(spi, data);
spi_stm32_shift_s(cfg->spi, data);
}
return spi_stm32_get_err(spi);
return spi_stm32_get_err(cfg->spi);
}
static void spi_stm32_cs_control(const struct device *dev, bool on)
@ -498,7 +515,7 @@ static void spi_stm32_isr(const struct device *dev)
}
if (spi_stm32_transfer_ongoing(data)) {
err = spi_stm32_shift_frames(spi, data);
err = spi_stm32_shift_frames(cfg, data);
}
if (err || !spi_stm32_transfer_ongoing(data)) {
@ -669,7 +686,7 @@ static int spi_stm32_release(const struct device *dev,
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32h7_spi)
static int32_t spi_stm32_count_bufset_frames(const struct spi_config *config,
const struct spi_buf_set *bufs)
const struct spi_buf_set *bufs)
{
if (bufs == NULL) {
return 0;
@ -690,8 +707,8 @@ static int32_t spi_stm32_count_bufset_frames(const struct spi_config *config,
}
static int32_t spi_stm32_count_total_frames(const struct spi_config *config,
const struct spi_buf_set *tx_bufs,
const struct spi_buf_set *rx_bufs)
const struct spi_buf_set *tx_bufs,
const struct spi_buf_set *rx_bufs)
{
int tx_frames = spi_stm32_count_bufset_frames(config, tx_bufs);
@ -816,7 +833,7 @@ static int transceive(const struct device *dev,
ret = spi_context_wait_for_completion(&data->ctx);
#else
do {
ret = spi_stm32_shift_frames(spi, data);
ret = spi_stm32_shift_frames(cfg, data);
} while (!ret && spi_stm32_transfer_ongoing(data));
spi_stm32_complete(dev, ret);