[PATCH 1/2] omap2-mcspi: use the same struct device for map and unmap

[PATCH 1/2] omap2-mcspi: use the same struct device for map and unmap

[Jan Luebbe]

The device mcspi->dev is used when calling dma_map_single, so use it
for dma_unmap_single, too.

Signed-off-by: Jan Luebbe <jlu-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
 drivers/spi/spi-omap2-mcspi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 0c73dd4..ceb27fc 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -388,7 +388,7 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 
 	if (tx != NULL) {
 		wait_for_completion(&mcspi_dma->dma_tx_completion);
-		dma_unmap_single(&spi->dev, xfer->tx_dma, count, DMA_TO_DEVICE);
+		dma_unmap_single(mcspi->dev, xfer->tx_dma, count, DMA_TO_DEVICE);
 
 		/* for TX_ONLY mode, be sure all words have shifted out */
 		if (rx == NULL) {
@@ -403,7 +403,7 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
 
 	if (rx != NULL) {
 		wait_for_completion(&mcspi_dma->dma_rx_completion);
-		dma_unmap_single(&spi->dev, xfer->rx_dma, count, DMA_FROM_DEVICE);
+		dma_unmap_single(mcspi->dev, xfer->rx_dma, count, DMA_FROM_DEVICE);
 		omap2_mcspi_set_enable(spi, 0);
 
 		if (l & OMAP2_MCSPI_CHCONF_TURBO) {
-- 
1.7.10.4


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[PATCH 2/2] omap2-mcspi: fall back to PIO when the buffer is in high mem

[Jan Luebbe]

UBI uses vmalloc'ed buffers in some cases which are not valid for
DMA, so use PIO instead.

Signed-off-by: Jan Luebbe <jlu-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
 drivers/spi/spi-omap2-mcspi.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index ceb27fc..6f361a1 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -927,7 +927,9 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
 				__raw_writel(0, cs->base
 						+ OMAP2_MCSPI_TX0);
 
-			if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
+			if (m->is_dma_mapped || (t->len >= DMA_MIN_BYTES
+				&& t->tx_buf < high_memory
+				&& t->rx_buf < high_memory))
 				count = omap2_mcspi_txrx_dma(spi, t);
 			else
 				count = omap2_mcspi_txrx_pio(spi, t);
@@ -1004,6 +1006,11 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master,
 		if (m->is_dma_mapped || len < DMA_MIN_BYTES)
 			continue;
 
+		if (tx_buf >= high_memory || rx_buf >= high_memory) {
+			WARN_ONCE(1, "high memory is invalid for DMA, falling back to PIO\n");
+			continue;
+		}
+
 		if (tx_buf != NULL) {
 			t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
 					len, DMA_TO_DEVICE);
-- 
1.7.10.4


------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/