diff options
Diffstat (limited to 'drivers/spi/spi-pxa2xx-dma.c')
| -rw-r--r-- | drivers/spi/spi-pxa2xx-dma.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c new file mode 100644 index 000000000..be563f0dd --- /dev/null +++ b/drivers/spi/spi-pxa2xx-dma.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PXA2xx SPI DMA engine support. + * + * Copyright (C) 2013, 2021 Intel Corporation + * Author: Mika Westerberg <mika.westerberg@linux.intel.com> + */ + +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/scatterlist.h> +#include <linux/sizes.h> + +#include <linux/spi/pxa2xx_spi.h> +#include <linux/spi/spi.h> + +#include "spi-pxa2xx.h" + +static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data, + bool error) +{ + struct spi_message *msg = drv_data->controller->cur_msg; + + /* + * It is possible that one CPU is handling ROR interrupt and other + * just gets DMA completion. Calling pump_transfers() twice for the + * same transfer leads to problems thus we prevent concurrent calls + * by using dma_running. + */ + if (atomic_dec_and_test(&drv_data->dma_running)) { + /* + * If the other CPU is still handling the ROR interrupt we + * might not know about the error yet. So we re-check the + * ROR bit here before we clear the status register. + */ + if (!error) + error = read_SSSR_bits(drv_data, drv_data->mask_sr) & SSSR_ROR; + + /* Clear status & disable interrupts */ + clear_SSCR1_bits(drv_data, drv_data->dma_cr1); + write_SSSR_CS(drv_data, drv_data->clear_sr); + if (!pxa25x_ssp_comp(drv_data)) + pxa2xx_spi_write(drv_data, SSTO, 0); + + if (error) { + /* In case we got an error we disable the SSP now */ + pxa_ssp_disable(drv_data->ssp); + msg->status = -EIO; + } + + spi_finalize_current_transfer(drv_data->controller); + } +} + +static void pxa2xx_spi_dma_callback(void *data) +{ + pxa2xx_spi_dma_transfer_complete(data, false); +} + +static struct dma_async_tx_descriptor * +pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data, + enum dma_transfer_direction dir, + struct spi_transfer *xfer) +{ + struct chip_data *chip = + spi_get_ctldata(drv_data->controller->cur_msg->spi); + enum dma_slave_buswidth width; + struct dma_slave_config cfg; + struct dma_chan *chan; + struct sg_table *sgt; + int ret; + + switch (drv_data->n_bytes) { + case 1: + width = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + case 2: + width = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + default: + width = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + } + + memset(&cfg, 0, sizeof(cfg)); + cfg.direction = dir; + + if (dir == DMA_MEM_TO_DEV) { + cfg.dst_addr = drv_data->ssp->phys_base + SSDR; + cfg.dst_addr_width = width; + cfg.dst_maxburst = chip->dma_burst_size; + + sgt = &xfer->tx_sg; + chan = drv_data->controller->dma_tx; + } else { + cfg.src_addr = drv_data->ssp->phys_base + SSDR; + cfg.src_addr_width = width; + cfg.src_maxburst = chip->dma_burst_size; + + sgt = &xfer->rx_sg; + chan = drv_data->controller->dma_rx; + } + + ret = dmaengine_slave_config(chan, &cfg); + if (ret) { + dev_warn(drv_data->ssp->dev, "DMA slave config failed\n"); + return NULL; + } + + return dmaengine_prep_slave_sg(chan, sgt->sgl, sgt->nents, dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); +} + +irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data) +{ + u32 status; + + status = read_SSSR_bits(drv_data, drv_data->mask_sr); + if (status & SSSR_ROR) { + dev_err(drv_data->ssp->dev, "FIFO overrun\n"); + + dmaengine_terminate_async(drv_data->controller->dma_rx); + dmaengine_terminate_async(drv_data->controller->dma_tx); + + pxa2xx_spi_dma_transfer_complete(drv_data, true); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, + struct spi_transfer *xfer) +{ + struct dma_async_tx_descriptor *tx_desc, *rx_desc; + int err; + + tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV, xfer); + if (!tx_desc) { + dev_err(drv_data->ssp->dev, "failed to get DMA TX descriptor\n"); + err = -EBUSY; + goto err_tx; + } + + rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM, xfer); + if (!rx_desc) { + dev_err(drv_data->ssp->dev, "failed to get DMA RX descriptor\n"); + err = -EBUSY; + goto err_rx; + } + + /* We are ready when RX completes */ + rx_desc->callback = pxa2xx_spi_dma_callback; + rx_desc->callback_param = drv_data; + + dmaengine_submit(rx_desc); + dmaengine_submit(tx_desc); + return 0; + +err_rx: + dmaengine_terminate_async(drv_data->controller->dma_tx); +err_tx: + return err; +} + +void pxa2xx_spi_dma_start(struct driver_data *drv_data) +{ + dma_async_issue_pending(drv_data->controller->dma_rx); + dma_async_issue_pending(drv_data->controller->dma_tx); + + atomic_set(&drv_data->dma_running, 1); +} + +void pxa2xx_spi_dma_stop(struct driver_data *drv_data) +{ + atomic_set(&drv_data->dma_running, 0); + dmaengine_terminate_sync(drv_data->controller->dma_rx); + dmaengine_terminate_sync(drv_data->controller->dma_tx); +} + +int pxa2xx_spi_dma_setup(struct driver_data *drv_data) +{ + struct pxa2xx_spi_controller *pdata = drv_data->controller_info; + struct spi_controller *controller = drv_data->controller; + struct device *dev = drv_data->ssp->dev; + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + controller->dma_tx = dma_request_slave_channel_compat(mask, + pdata->dma_filter, pdata->tx_param, dev, "tx"); + if (!controller->dma_tx) + return -ENODEV; + + controller->dma_rx = dma_request_slave_channel_compat(mask, + pdata->dma_filter, pdata->rx_param, dev, "rx"); + if (!controller->dma_rx) { + dma_release_channel(controller->dma_tx); + controller->dma_tx = NULL; + return -ENODEV; + } + + return 0; +} + +void pxa2xx_spi_dma_release(struct driver_data *drv_data) +{ + struct spi_controller *controller = drv_data->controller; + + if (controller->dma_rx) { + dmaengine_terminate_sync(controller->dma_rx); + dma_release_channel(controller->dma_rx); + controller->dma_rx = NULL; + } + if (controller->dma_tx) { + dmaengine_terminate_sync(controller->dma_tx); + dma_release_channel(controller->dma_tx); + controller->dma_tx = NULL; + } +} + +int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, + struct spi_device *spi, + u8 bits_per_word, u32 *burst_code, + u32 *threshold) +{ + struct pxa2xx_spi_chip *chip_info = spi->controller_data; + struct driver_data *drv_data = spi_controller_get_devdata(spi->controller); + u32 dma_burst_size = drv_data->controller_info->dma_burst_size; + + /* + * If the DMA burst size is given in chip_info we use that, + * otherwise we use the default. Also we use the default FIFO + * thresholds for now. + */ + *burst_code = chip_info ? chip_info->dma_burst_size : dma_burst_size; + *threshold = SSCR1_RxTresh(RX_THRESH_DFLT) + | SSCR1_TxTresh(TX_THRESH_DFLT); + + return 0; +} |