static inline nrf_spis_mode_t get_nrf_spis_mode(u16_t operation) { if (SPI_MODE_GET(operation) & SPI_MODE_CPOL) { if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) { return NRF_SPIS_MODE_3; } else { return NRF_SPIS_MODE_2; } } else { if (SPI_MODE_GET(operation) & SPI_MODE_CPHA) { return NRF_SPIS_MODE_1; } else { return NRF_SPIS_MODE_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; }