different DMA completion callback functions for tx and rx and
use a single callback function instead]
Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
drivers/spi/davinci_spi.c | 58 +++++++++++++++++---------------------------
1 files changed, 23 insertions(+), 35 deletions(-)
@@ -118,9 +118,6 @@ struct davinci_spi_dma {
int dma_rx_channel;
int dummy_param_slot;
enum dma_event_q eventq;
-
- struct completion dma_tx_completion;
- struct completion dma_rx_completion;
};
/* SPI Controller driver's private data. */
@@ -386,32 +383,6 @@ static int davinci_spi_setup_transfer(struct spi_device *spi,
return 0;
}
-static void davinci_spi_dma_rx_callback(unsigned lch, u16 ch_status, void *data)
-{
- struct davinci_spi *davinci_spi = data;
- struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels;
-
- edma_stop(davinci_spi_dma->dma_rx_channel);
-
- if (ch_status == DMA_COMPLETE)
- davinci_spi->rcount = 0;
-
- complete(&davinci_spi_dma->dma_rx_completion);
-}
-
-static void davinci_spi_dma_tx_callback(unsigned lch, u16 ch_status, void *data)
-{
- struct davinci_spi *davinci_spi = data;
- struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels;
-
- edma_stop(davinci_spi_dma->dma_tx_channel);
-
- if (ch_status == DMA_COMPLETE)
- davinci_spi->wcount = 0;
-
- complete(&davinci_spi_dma->dma_tx_completion);
-}
-
/**
* davinci_spi_setup - This functions will set default transfer method
* @spi: spi device on which data transfer to be done
@@ -630,6 +601,25 @@ static irqreturn_t davinci_spi_irq(s32 irq, void *context_data)
return IRQ_HANDLED;
}
+static void davinci_spi_dma_callback(unsigned lch, u16 status, void *data)
+{
+ struct davinci_spi *davinci_spi = data;
+ struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels;
+
+ edma_stop(lch);
+
+ if (status == DMA_COMPLETE) {
+ if (lch == davinci_spi_dma->dma_rx_channel)
+ davinci_spi->rcount = 0;
+ if (lch == davinci_spi_dma->dma_tx_channel)
+ davinci_spi->wcount = 0;
+ }
+
+ if ((!davinci_spi->wcount && !davinci_spi->rcount) ||
+ (status != DMA_COMPLETE))
+ complete(&davinci_spi->done);
+}
+
static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
{
struct davinci_spi *davinci_spi;
@@ -660,8 +650,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
davinci_spi->wcount = t->len / data_type;
davinci_spi->rcount = davinci_spi->wcount;
- init_completion(&davinci_spi_dma->dma_rx_completion);
- init_completion(&davinci_spi_dma->dma_tx_completion);
+ INIT_COMPLETION(davinci_spi->done);
/* disable all interrupts for dma transfers */
clear_io_bits(davinci_spi->base + SPIINT, SPIINT_MASKALL);
@@ -752,8 +741,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
edma_start(davinci_spi_dma->dma_tx_channel);
set_io_bits(davinci_spi->base + SPIINT, SPIINT_DMA_REQ_EN);
- wait_for_completion_interruptible(&davinci_spi_dma->dma_tx_completion);
- wait_for_completion_interruptible(&davinci_spi_dma->dma_rx_completion);
+ wait_for_completion_interruptible(&davinci_spi->done);
if (t->tx_buf)
dma_unmap_single(NULL, t->tx_dma, davinci_spi->wcount,
@@ -787,7 +775,7 @@ static int davinci_spi_request_dma(struct davinci_spi *davinci_spi)
struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels;
r = edma_alloc_channel(davinci_spi_dma->dma_rx_channel,
- davinci_spi_dma_rx_callback, davinci_spi,
+ davinci_spi_dma_callback, davinci_spi,
davinci_spi_dma->eventq);
if (r < 0) {
pr_err("Unable to request DMA channel for SPI RX\n");
@@ -796,7 +784,7 @@ static int davinci_spi_request_dma(struct davinci_spi *davinci_spi)
}
r = edma_alloc_channel(davinci_spi_dma->dma_tx_channel,
- davinci_spi_dma_tx_callback, davinci_spi,
+ davinci_spi_dma_callback, davinci_spi,
davinci_spi_dma->eventq);
if (r < 0) {
pr_err("Unable to request DMA channel for SPI TX\n");