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authorGeert Uytterhoeven <geert+renesas@glider.be>2014-06-02 15:38:15 +0200
committerMark Brown <broonie@linaro.org>2014-06-02 16:49:35 +0200
commitc52fb6d63425248bd4152451a2cc74b7df8fa989 (patch)
tree369084deb2c83d773f84b6a320186094244e5b56 /drivers/spi/spi-rspi.c
parentspi: rspi: Pass sg_tables instead of spi_tranfer to rspi_*_dma() (diff)
downloadlinux-c52fb6d63425248bd4152451a2cc74b7df8fa989.tar.xz
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.c139
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)