diff options
| -rw-r--r-- | drivers/rapidio/rio.c | 66 | ||||
| -rw-r--r-- | include/linux/rio_drv.h | 5 |
2 files changed, 52 insertions, 19 deletions
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index a54ba0494dd3..d7b87c64b7cd 100644 --- a/drivers/rapidio/rio.c +++ b/drivers/rapidio/rio.c @@ -1509,30 +1509,39 @@ EXPORT_SYMBOL_GPL(rio_route_clr_table); static bool rio_chan_filter(struct dma_chan *chan, void *arg) { - struct rio_dev *rdev = arg; + struct rio_mport *mport = arg; /* Check that DMA device belongs to the right MPORT */ - return (rdev->net->hport == - container_of(chan->device, struct rio_mport, dma)); + return mport == container_of(chan->device, struct rio_mport, dma); } /** - * rio_request_dma - request RapidIO capable DMA channel that supports - * specified target RapidIO device. - * @rdev: RIO device control structure + * rio_request_mport_dma - request RapidIO capable DMA channel associated + * with specified local RapidIO mport device. + * @mport: RIO mport to perform DMA data transfers * * Returns pointer to allocated DMA channel or NULL if failed. */ -struct dma_chan *rio_request_dma(struct rio_dev *rdev) +struct dma_chan *rio_request_mport_dma(struct rio_mport *mport) { dma_cap_mask_t mask; - struct dma_chan *dchan; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - dchan = dma_request_channel(mask, rio_chan_filter, rdev); + return dma_request_channel(mask, rio_chan_filter, mport); +} +EXPORT_SYMBOL_GPL(rio_request_mport_dma); - return dchan; +/** + * rio_request_dma - request RapidIO capable DMA channel that supports + * specified target RapidIO device. + * @rdev: RIO device associated with DMA transfer + * + * Returns pointer to allocated DMA channel or NULL if failed. + */ +struct dma_chan *rio_request_dma(struct rio_dev *rdev) +{ + return rio_request_mport_dma(rdev->net->hport); } EXPORT_SYMBOL_GPL(rio_request_dma); @@ -1547,10 +1556,10 @@ void rio_release_dma(struct dma_chan *dchan) EXPORT_SYMBOL_GPL(rio_release_dma); /** - * rio_dma_prep_slave_sg - RapidIO specific wrapper + * rio_dma_prep_xfer - RapidIO specific wrapper * for device_prep_slave_sg callback defined by DMAENGINE. - * @rdev: RIO device control structure * @dchan: DMA channel to configure + * @destid: target RapidIO device destination ID * @data: RIO specific data descriptor * @direction: DMA data transfer direction (TO or FROM the device) * @flags: dmaengine defined flags @@ -1560,11 +1569,10 @@ EXPORT_SYMBOL_GPL(rio_release_dma); * target RIO device. * Returns pointer to DMA transaction descriptor or NULL if failed. */ -struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev, - struct dma_chan *dchan, struct rio_dma_data *data, +struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan, + u16 destid, struct rio_dma_data *data, enum dma_transfer_direction direction, unsigned long flags) { - struct dma_async_tx_descriptor *txd = NULL; struct rio_dma_ext rio_ext; if (dchan->device->device_prep_slave_sg == NULL) { @@ -1572,15 +1580,35 @@ struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev, return NULL; } - rio_ext.destid = rdev->destid; + rio_ext.destid = destid; rio_ext.rio_addr_u = data->rio_addr_u; rio_ext.rio_addr = data->rio_addr; rio_ext.wr_type = data->wr_type; - txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len, - direction, flags, &rio_ext); + return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len, + direction, flags, &rio_ext); +} +EXPORT_SYMBOL_GPL(rio_dma_prep_xfer); - return txd; +/** + * rio_dma_prep_slave_sg - RapidIO specific wrapper + * for device_prep_slave_sg callback defined by DMAENGINE. + * @rdev: RIO device control structure + * @dchan: DMA channel to configure + * @data: RIO specific data descriptor + * @direction: DMA data transfer direction (TO or FROM the device) + * @flags: dmaengine defined flags + * + * Initializes RapidIO capable DMA channel for the specified data transfer. + * Uses DMA channel private extension to pass information related to remote + * target RIO device. + * Returns pointer to DMA transaction descriptor or NULL if failed. + */ +struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev, + struct dma_chan *dchan, struct rio_dma_data *data, + enum dma_transfer_direction direction, unsigned long flags) +{ + return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags); } EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg); diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h index 5059994fe297..9fc2f213e74f 100644 --- a/include/linux/rio_drv.h +++ b/include/linux/rio_drv.h @@ -384,11 +384,16 @@ void rio_dev_put(struct rio_dev *); #ifdef CONFIG_RAPIDIO_DMA_ENGINE extern struct dma_chan *rio_request_dma(struct rio_dev *rdev); +extern struct dma_chan *rio_request_mport_dma(struct rio_mport *mport); extern void rio_release_dma(struct dma_chan *dchan); extern struct dma_async_tx_descriptor *rio_dma_prep_slave_sg( struct rio_dev *rdev, struct dma_chan *dchan, struct rio_dma_data *data, enum dma_transfer_direction direction, unsigned long flags); +extern struct dma_async_tx_descriptor *rio_dma_prep_xfer( + struct dma_chan *dchan, u16 destid, + struct rio_dma_data *data, + enum dma_transfer_direction direction, unsigned long flags); #endif /** |