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MCUX Flexcomm SPI: Add Slave support

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Add support for Slave mode in the mcux flexcomm spi driver

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
This commit is contained in:
Mahesh Mahadevan 2020-08-19 15:52:01 -05:00 • committed by Maureen Helm
commit 99f24aeac6
1 changed files with 76 additions and 40 deletions
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116
drivers/spi/spi_mcux_flexcomm.c
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@ -102,7 +102,7 @@ static void spi_mcux_isr(void *arg)
SPI_MasterTransferHandleIRQ(base, &data->handle);
}
static void spi_mcux_master_transfer_callback(SPI_Type *base,
static void spi_mcux_transfer_callback(SPI_Type *base,
spi_master_handle_t *handle, status_t status, void *userData)
{
struct device *dev = userData;
@ -120,7 +120,6 @@ static int spi_mcux_configure(struct device *dev,
const struct spi_mcux_config *config = dev->config;
struct spi_mcux_data *data = dev->data;
SPI_Type *base = config->base;
spi_master_config_t master_config;
uint32_t clock_freq;
uint32_t word_size;
@ -129,14 +128,6 @@ static int spi_mcux_configure(struct device *dev,
return 0;
}
SPI_MasterGetDefaultConfig(&master_config);
if (spi_cfg->slave > SPI_CHIP_SELECT_COUNT) {
LOG_ERR("Slave %d is greater than %d",
spi_cfg->slave, SPI_CHIP_SELECT_COUNT);
return -EINVAL;
}
word_size = SPI_WORD_SIZE_GET(spi_cfg->operation);
if (word_size > SPI_MAX_DATA_WIDTH) {
LOG_ERR("Word size %d is greater than %d",
@ -144,42 +135,87 @@ static int spi_mcux_configure(struct device *dev,
return -EINVAL;
}
master_config.sselNum = spi_cfg->slave;
master_config.sselPol = kSPI_SpolActiveAllLow;
master_config.dataWidth = word_size - 1;
master_config.polarity =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL)
? kSPI_ClockPolarityActiveLow
: kSPI_ClockPolarityActiveHigh;
master_config.phase =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA)
? kSPI_ClockPhaseSecondEdge
: kSPI_ClockPhaseFirstEdge;
master_config.direction =
(spi_cfg->operation & SPI_TRANSFER_LSB)
? kSPI_LsbFirst
: kSPI_MsbFirst;
master_config.baudRate_Bps = spi_cfg->frequency;
/* The clock frequency is hardcoded CPU's speed to allow SPI to
* function at high speeds. The core clock and flexcomm should
* use the same clock source.
/*
* Do master or slave initializastion, depending on the
* mode requested.
*/
clock_freq = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
if (SPI_OP_MODE_GET(spi_cfg->operation) == SPI_OP_MODE_MASTER) {
spi_master_config_t master_config;
SPI_MasterInit(base, &master_config, clock_freq);
SPI_MasterGetDefaultConfig(&master_config);
SPI_MasterTransferCreateHandle(base, &data->handle,
spi_mcux_master_transfer_callback, dev);
if (spi_cfg->slave > SPI_CHIP_SELECT_COUNT) {
LOG_ERR("Slave %d is greater than %d",
spi_cfg->slave, SPI_CHIP_SELECT_COUNT);
return -EINVAL;
}
SPI_SetDummyData(base, 0);
master_config.sselNum = spi_cfg->slave;
master_config.sselPol = kSPI_SpolActiveAllLow;
master_config.dataWidth = word_size - 1;
master_config.polarity =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL)
? kSPI_ClockPolarityActiveLow
: kSPI_ClockPolarityActiveHigh;
master_config.phase =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA)
? kSPI_ClockPhaseSecondEdge
: kSPI_ClockPhaseFirstEdge;
master_config.direction =
(spi_cfg->operation & SPI_TRANSFER_LSB)
? kSPI_LsbFirst
: kSPI_MsbFirst;
master_config.baudRate_Bps = spi_cfg->frequency;
/* The clock frequency is hardcoded CPU's speed to allow SPI to
* function at high speeds. The core clock and flexcomm should
* use the same clock source.
*/
clock_freq = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
SPI_MasterInit(base, &master_config, clock_freq);
SPI_MasterTransferCreateHandle(base, &data->handle,
spi_mcux_transfer_callback, dev);
SPI_SetDummyData(base, 0);
spi_context_cs_configure(&data->ctx);
} else {
spi_slave_config_t slave_config;
SPI_SlaveGetDefaultConfig(&slave_config);
slave_config.polarity =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPOL)
? kSPI_ClockPolarityActiveLow
: kSPI_ClockPolarityActiveHigh;
slave_config.phase =
(SPI_MODE_GET(spi_cfg->operation) & SPI_MODE_CPHA)
? kSPI_ClockPhaseSecondEdge
: kSPI_ClockPhaseFirstEdge;
slave_config.direction =
(spi_cfg->operation & SPI_TRANSFER_LSB)
? kSPI_LsbFirst
: kSPI_MsbFirst;
/* SS pin active low */
slave_config.sselPol = kSPI_SpolActiveAllLow;
slave_config.dataWidth = word_size - 1;
SPI_SlaveInit(base, &slave_config);
SPI_SlaveTransferCreateHandle(base, &data->handle,
spi_mcux_transfer_callback, dev);
}
data->ctx.config = spi_cfg;
spi_context_cs_configure(&data->ctx);
return 0;
}