static int spi_dw_configure(struct device *dev,
struct spi_config *config)
{
const struct spi_dw_config *info = dev->config->config_info;
struct spi_dw_data *spi = dev->driver_data;
u32_t flags = config->config;
u32_t ctrlr0 = 0;
u32_t mode;
SYS_LOG_DBG("%p (0x%x), %p", dev, info->regs, config);
/* Check status */
if (!_spi_dw_is_controller_ready(dev)) {
SYS_LOG_DBG("Controller is busy");
return -EBUSY;
}
/* Word size */
ctrlr0 |= DW_SPI_CTRLR0_DFS(SPI_WORD_SIZE_GET(flags));
/* Determine how many bytes are required per-frame */
spi->dfs = SPI_WS_TO_DFS(SPI_WORD_SIZE_GET(flags));
/* SPI mode */
mode = SPI_MODE(flags);
if (mode & SPI_MODE_CPOL) {
ctrlr0 |= DW_SPI_CTRLR0_SCPOL;
}
if (mode & SPI_MODE_CPHA) {
ctrlr0 |= DW_SPI_CTRLR0_SCPH;
}
if (mode & SPI_MODE_LOOP) {
ctrlr0 |= DW_SPI_CTRLR0_SRL;
}
/* Installing the configuration */
write_ctrlr0(ctrlr0, info->regs);
/*
* Configure the rate. Use this small hack to allow the user to call
* spi_configure() with both a divider (as the driver was initially
* written) and a frequency (as the SPI API suggests to). The clock
* divider is a 16bit value, hence we can fairly, and safely, assume
* that everything above this value is a frequency. The trade-off is
* that if one wants to use a bus frequency of 64kHz (or less), it has
* the use a divider...
*/
if (config->max_sys_freq > 0xffff) {
write_baudr(SPI_DW_CLK_DIVIDER(config->max_sys_freq),
info->regs);
} else {
write_baudr(config->max_sys_freq, info->regs);
}
return 0;
}
static int spi_dw_configure(const struct spi_dw_config *info,
struct spi_dw_data *spi,
const struct spi_config *config)
{
u32_t ctrlr0 = 0U;
LOG_DBG("%p (prev %p)", config, spi->ctx.config);
if (spi_context_configured(&spi->ctx, config)) {
/* Nothing to do */
return 0;
}
/* Verify if requested op mode is relevant to this controller */
if (config->operation & SPI_OP_MODE_SLAVE) {
if (!(info->op_modes & SPI_CTX_RUNTIME_OP_MODE_SLAVE)) {
LOG_ERR("Slave mode not supported");
return -ENOTSUP;
}
} else {
if (!(info->op_modes & SPI_CTX_RUNTIME_OP_MODE_MASTER)) {
LOG_ERR("Master mode not supported");
return -ENOTSUP;
}
}
if (config->operation & (SPI_TRANSFER_LSB |
SPI_LINES_DUAL | SPI_LINES_QUAD)) {
LOG_ERR("Unsupported configuration");
return -EINVAL;
}
/* Word size */
ctrlr0 |= DW_SPI_CTRLR0_DFS(SPI_WORD_SIZE_GET(config->operation));
/* Determine how many bytes are required per-frame */
spi->dfs = SPI_WS_TO_DFS(SPI_WORD_SIZE_GET(config->operation));
/* SPI mode */
if (SPI_MODE_GET(config->operation) & SPI_MODE_CPOL) {
ctrlr0 |= DW_SPI_CTRLR0_SCPOL;
}
if (SPI_MODE_GET(config->operation) & SPI_MODE_CPHA) {
ctrlr0 |= DW_SPI_CTRLR0_SCPH;
}
if (SPI_MODE_GET(config->operation) & SPI_MODE_LOOP) {
ctrlr0 |= DW_SPI_CTRLR0_SRL;
}
/* Installing the configuration */
write_ctrlr0(ctrlr0, info->regs);
/* At this point, it's mandatory to set this on the context! */
spi->ctx.config = config;
if (!spi_dw_is_slave(spi)) {
/* Baud rate and Slave select, for master only */
write_baudr(SPI_DW_CLK_DIVIDER(config->frequency), info->regs);
write_ser(1 << config->slave, info->regs);
}
spi_context_cs_configure(&spi->ctx);
if (spi_dw_is_slave(spi)) {
LOG_DBG("Installed slave config %p:"
" ws/dfs %u/%u, mode %u/%u/%u",
config,
SPI_WORD_SIZE_GET(config->operation), spi->dfs,
(SPI_MODE_GET(config->operation) &
SPI_MODE_CPOL) ? 1 : 0,
(SPI_MODE_GET(config->operation) &
SPI_MODE_CPHA) ? 1 : 0,
(SPI_MODE_GET(config->operation) &
SPI_MODE_LOOP) ? 1 : 0);
} else {
LOG_DBG("Installed master config %p: freq %uHz (div = %u),"
" ws/dfs %u/%u, mode %u/%u/%u, slave %u",
config, config->frequency,
SPI_DW_CLK_DIVIDER(config->frequency),
SPI_WORD_SIZE_GET(config->operation), spi->dfs,
(SPI_MODE_GET(config->operation) &
SPI_MODE_CPOL) ? 1 : 0,
(SPI_MODE_GET(config->operation) &
SPI_MODE_CPHA) ? 1 : 0,
(SPI_MODE_GET(config->operation) &
SPI_MODE_LOOP) ? 1 : 0,
config->slave);
}
return 0;
}
