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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2014-06-02 15:38:15 +0200 |
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committer | Mark Brown <broonie@linaro.org> | 2014-06-02 15:49:35 +0100 |
commit | c52fb6d63425248bd4152451a2cc74b7df8fa989 (patch) | |
tree | 369084deb2c83d773f84b6a320186094244e5b56 /drivers/spi/spi-rspi.c | |
parent | e4b52dc4625ee739195189d40c6ddc7d55ddf312 (diff) | |
download | linux-c52fb6d63425248bd4152451a2cc74b7df8fa989.tar.gz linux-c52fb6d63425248bd4152451a2cc74b7df8fa989.tar.bz2 linux-c52fb6d63425248bd4152451a2cc74b7df8fa989.zip |
spi: rspi: Merge rspi_*_dma() into rspi_dma_transfer()
rspi_send_dma() and rspi_send_receive_dma() are very similar. Consolidate
into a single function rspi_dma_transfer(), and add missing checks for
dmaengine_submit() failures.
Both sg_table pointer parameters can be NULL, as RSPI supports TX-only
mode, and unidirectional DMA transfers will also be needed later for
Dual/Quad DMA support.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
-rw-r--r-- | drivers/spi/spi-rspi.c | 139 |
1 files changed, 61 insertions, 78 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index bfa5e7e5df5a..c77cfe654b0e 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -463,30 +463,67 @@ static void rspi_dma_complete(void *arg) wake_up_interruptible(&rspi->wait); } -static int rspi_send_dma(struct rspi_data *rspi, struct sg_table *tx) +static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx, + struct sg_table *rx) { - struct dma_async_tx_descriptor *desc; + struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL; + u8 irq_mask = 0; + unsigned int other_irq = 0; + dma_cookie_t cookie; int ret; - desc = dmaengine_prep_slave_sg(rspi->master->dma_tx, tx->sgl, - tx->nents, DMA_TO_DEVICE, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc) - return -EIO; + if (tx) { + desc_tx = dmaengine_prep_slave_sg(rspi->master->dma_tx, + tx->sgl, tx->nents, DMA_TO_DEVICE, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_tx) + return -EIO; + + irq_mask |= SPCR_SPTIE; + } + if (rx) { + desc_rx = dmaengine_prep_slave_sg(rspi->master->dma_rx, + rx->sgl, rx->nents, DMA_FROM_DEVICE, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc_rx) + return -EIO; + + irq_mask |= SPCR_SPRIE; + } /* - * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be + * DMAC needs SPxIE, but if SPxIE is set, the IRQ routine will be * called. So, this driver disables the IRQ while DMA transfer. */ - disable_irq(rspi->tx_irq); + if (tx) + disable_irq(other_irq = rspi->tx_irq); + if (rx && rspi->rx_irq != other_irq) + disable_irq(rspi->rx_irq); - rspi_enable_irq(rspi, SPCR_SPTIE); + rspi_enable_irq(rspi, irq_mask); rspi->dma_callbacked = 0; - desc->callback = rspi_dma_complete; - desc->callback_param = rspi; - dmaengine_submit(desc); - dma_async_issue_pending(rspi->master->dma_tx); + if (rx) { + desc_rx->callback = rspi_dma_complete; + desc_rx->callback_param = rspi; + cookie = dmaengine_submit(desc_rx); + if (dma_submit_error(cookie)) + return cookie; + dma_async_issue_pending(rspi->master->dma_rx); + } + if (tx) { + if (rx) { + /* No callback */ + desc_tx->callback = NULL; + } else { + desc_tx->callback = rspi_dma_complete; + desc_tx->callback_param = rspi; + } + cookie = dmaengine_submit(desc_tx); + if (dma_submit_error(cookie)) + return cookie; + dma_async_issue_pending(rspi->master->dma_tx); + } ret = wait_event_interruptible_timeout(rspi->wait, rspi->dma_callbacked, HZ); @@ -494,9 +531,14 @@ static int rspi_send_dma(struct rspi_data *rspi, struct sg_table *tx) ret = 0; else if (!ret) ret = -ETIMEDOUT; - rspi_disable_irq(rspi, SPCR_SPTIE); - enable_irq(rspi->tx_irq); + rspi_disable_irq(rspi, irq_mask); + + if (tx) + enable_irq(rspi->tx_irq); + if (rx && rspi->rx_irq != other_irq) + enable_irq(rspi->rx_irq); + return ret; } @@ -530,61 +572,6 @@ static void qspi_receive_init(const struct rspi_data *rspi) rspi_write8(rspi, 0, QSPI_SPBFCR); } -static int rspi_send_receive_dma(struct rspi_data *rspi, struct sg_table *tx, - struct sg_table *rx) -{ - struct dma_async_tx_descriptor *desc_tx, *desc_rx; - int ret; - - /* prepare transmit transfer */ - desc_tx = dmaengine_prep_slave_sg(rspi->master->dma_tx, tx->sgl, - tx->nents, DMA_TO_DEVICE, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc_tx) - return -EIO; - - /* prepare receive transfer */ - desc_rx = dmaengine_prep_slave_sg(rspi->master->dma_rx, rx->sgl, - rx->nents, DMA_FROM_DEVICE, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc_rx) - return -EIO; - - /* - * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be - * called. So, this driver disables the IRQ while DMA transfer. - */ - disable_irq(rspi->tx_irq); - if (rspi->rx_irq != rspi->tx_irq) - disable_irq(rspi->rx_irq); - - rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE); - rspi->dma_callbacked = 0; - - desc_rx->callback = rspi_dma_complete; - desc_rx->callback_param = rspi; - dmaengine_submit(desc_rx); - dma_async_issue_pending(rspi->master->dma_rx); - - desc_tx->callback = NULL; /* No callback */ - dmaengine_submit(desc_tx); - dma_async_issue_pending(rspi->master->dma_tx); - - ret = wait_event_interruptible_timeout(rspi->wait, - rspi->dma_callbacked, HZ); - if (ret > 0 && rspi->dma_callbacked) - ret = 0; - else if (!ret) - ret = -ETIMEDOUT; - rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE); - - enable_irq(rspi->tx_irq); - if (rspi->rx_irq != rspi->tx_irq) - enable_irq(rspi->rx_irq); - - return ret; -} - static bool __rspi_can_dma(const struct rspi_data *rspi, const struct spi_transfer *xfer) { @@ -615,13 +602,9 @@ static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi, } rspi_write8(rspi, spcr, RSPI_SPCR); - if (master->can_dma && __rspi_can_dma(rspi, xfer)) { - if (xfer->rx_buf) - return rspi_send_receive_dma(rspi, &xfer->tx_sg, - &xfer->rx_sg); - else - return rspi_send_dma(rspi, &xfer->tx_sg); - } + if (master->can_dma && __rspi_can_dma(rspi, xfer)) + return rspi_dma_transfer(rspi, &xfer->tx_sg, + xfer->rx_buf ? &xfer->rx_sg : NULL); ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len); if (ret < 0) |