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authorMark Brown <broonie@linaro.org>2014-01-16 12:22:43 +0000
committerMark Brown <broonie@linaro.org>2014-02-03 13:05:21 +0000
commit99adef310f682d6343cb40c1f6c9c25a4b3a450d (patch)
tree40310c296f820941de639b761927ee6375a623ce /drivers/spi/spi.c
parent38dbfb59d1175ef458d006556061adeaa8751b72 (diff)
spi: Provide core support for DMA mapping transfers
The process of DMA mapping buffers for SPI transfers does not vary between devices so in order to save duplication of code in drivers this can be factored out into the core, allowing it to be integrated with the work that is being done on factoring out the common elements from the data path including more sharing of dmaengine code. In order to use this masters need to provide a can_dma() operation and while the hardware is prepared they should ensure that DMA channels are provided in tx_dma and rx_dma. The core will then ensure that the buffers are mapped for DMA prior to calling transfer_one_message(). Currently the cleanup on error is not complete, this needs to be improved. Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r--drivers/spi/spi.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 23756b0f903..bcdaa74f1c8 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -24,6 +24,8 @@
#include <linux/device.h>
#include <linux/init.h>
#include <linux/cache.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
@@ -580,6 +582,77 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
spi->master->set_cs(spi, !enable);
}
+static int spi_map_msg(struct spi_master *master, struct spi_message *msg)
+{
+ struct device *dev = master->dev.parent;
+ struct device *tx_dev, *rx_dev;
+ struct spi_transfer *xfer;
+
+ if (msg->is_dma_mapped || !master->can_dma)
+ return 0;
+
+ tx_dev = &master->dma_tx->dev->device;
+ rx_dev = &master->dma_rx->dev->device;
+
+ list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ if (!master->can_dma(master, msg->spi, xfer))
+ continue;
+
+ if (xfer->tx_buf != NULL) {
+ xfer->tx_dma = dma_map_single(tx_dev,
+ (void *)xfer->tx_buf,
+ xfer->len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, xfer->tx_dma)) {
+ dev_err(dev, "dma_map_single Tx failed\n");
+ return -ENOMEM;
+ }
+ }
+
+ if (xfer->rx_buf != NULL) {
+ xfer->rx_dma = dma_map_single(rx_dev,
+ xfer->rx_buf, xfer->len,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, xfer->rx_dma)) {
+ dev_err(dev, "dma_map_single Rx failed\n");
+ dma_unmap_single(tx_dev, xfer->tx_dma,
+ xfer->len, DMA_TO_DEVICE);
+ return -ENOMEM;
+ }
+ }
+ }
+
+ master->cur_msg_mapped = true;
+
+ return 0;
+}
+
+static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
+{
+ struct spi_transfer *xfer;
+ struct device *tx_dev, *rx_dev;
+
+ if (!master->cur_msg_mapped || msg->is_dma_mapped || !master->can_dma)
+ return 0;
+
+ tx_dev = &master->dma_tx->dev->device;
+ rx_dev = &master->dma_rx->dev->device;
+
+ list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+ if (!master->can_dma(master, msg->spi, xfer))
+ continue;
+
+ if (xfer->rx_buf)
+ dma_unmap_single(rx_dev, xfer->rx_dma, xfer->len,
+ DMA_FROM_DEVICE);
+ if (xfer->tx_buf)
+ dma_unmap_single(tx_dev, xfer->tx_dma, xfer->len,
+ DMA_TO_DEVICE);
+ }
+
+ return 0;
+}
+
/*
* spi_transfer_one_message - Default implementation of transfer_one_message()
*
@@ -752,6 +825,13 @@ static void spi_pump_messages(struct kthread_work *work)
master->cur_msg_prepared = true;
}
+ ret = spi_map_msg(master, master->cur_msg);
+ if (ret) {
+ master->cur_msg->status = ret;
+ spi_finalize_current_message(master);
+ return;
+ }
+
ret = master->transfer_one_message(master, master->cur_msg);
if (ret) {
dev_err(&master->dev,
@@ -841,6 +921,8 @@ void spi_finalize_current_message(struct spi_master *master)
queue_kthread_work(&master->kworker, &master->pump_messages);
spin_unlock_irqrestore(&master->queue_lock, flags);
+ spi_unmap_msg(master, mesg);
+
if (master->cur_msg_prepared && master->unprepare_message) {
ret = master->unprepare_message(master, mesg);
if (ret) {