diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0399-dmaengine-bcm2835-add-dma_memcopy-support-to-bcm2835.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0399-dmaengine-bcm2835-add-dma_memcopy-support-to-bcm2835.patch | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0399-dmaengine-bcm2835-add-dma_memcopy-support-to-bcm2835.patch b/target/linux/brcm2708/patches-4.4/0399-dmaengine-bcm2835-add-dma_memcopy-support-to-bcm2835.patch new file mode 100644 index 0000000..a7b50a5 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0399-dmaengine-bcm2835-add-dma_memcopy-support-to-bcm2835.patch @@ -0,0 +1,87 @@ +From 24392a5f014f3106442cef99e9956d0f826337e3 Mon Sep 17 00:00:00 2001 +From: Martin Sperl <kernel@martin.sperl.org> +Date: Wed, 16 Mar 2016 12:25:02 -0700 +Subject: [PATCH] dmaengine: bcm2835: add dma_memcopy support to bcm2835-dma + +Also added check for an error condition in bcm2835_dma_create_cb_chain +that showed up during development of this patch. + +Tested using dmatest for all enabled channels. + +Signed-off-by: Martin Sperl <kernel@martin.sperl.org> +Reviewed-by: Eric Anholt <eric@anholt.net> +Signed-off-by: Eric Anholt <eric@anholt.net> +Signed-off-by: Vinod Koul <vinod.koul@intel.com> +--- + drivers/dma/bcm2835-dma.c | 36 +++++++++++++++++++++++++++++++++++- + 1 file changed, 35 insertions(+), 1 deletion(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -310,6 +310,9 @@ static struct bcm2835_desc *bcm2835_dma_ + struct bcm2835_cb_entry *cb_entry; + struct bcm2835_dma_cb *control_block; + ++ if (!frames) ++ return NULL; ++ + /* allocate and setup the descriptor. */ + d = kzalloc(sizeof(*d) + frames * sizeof(struct bcm2835_cb_entry), + gfp); +@@ -597,6 +600,34 @@ static void bcm2835_dma_issue_pending(st + spin_unlock_irqrestore(&c->vc.lock, flags); + } + ++struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy( ++ struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, ++ size_t len, unsigned long flags) ++{ ++ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); ++ struct bcm2835_desc *d; ++ u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC; ++ u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; ++ size_t max_len = bcm2835_dma_max_frame_length(c); ++ size_t frames; ++ ++ /* if src, dst or len is not given return with an error */ ++ if (!src || !dst || !len) ++ return NULL; ++ ++ /* calculate number of frames */ ++ frames = bcm2835_dma_frames_for_length(len, max_len); ++ ++ /* allocate the CB chain - this also fills in the pointers */ ++ d = bcm2835_dma_create_cb_chain(chan, DMA_MEM_TO_MEM, false, ++ info, extra, frames, ++ src, dst, len, 0, GFP_KERNEL); ++ if (!d) ++ return NULL; ++ ++ return vchan_tx_prep(&c->vc, &d->vd, flags); ++} ++ + static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( + struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, +@@ -880,17 +911,20 @@ static int bcm2835_dma_probe(struct plat + dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask); + dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); + dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); ++ dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask); + od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources; + od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources; + od->ddev.device_tx_status = bcm2835_dma_tx_status; + od->ddev.device_issue_pending = bcm2835_dma_issue_pending; + od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic; + od->ddev.device_prep_slave_sg = bcm2835_dma_prep_slave_sg; ++ od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy; + od->ddev.device_config = bcm2835_dma_slave_config; + od->ddev.device_terminate_all = bcm2835_dma_terminate_all; + od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); +- od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); ++ od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) | ++ BIT(DMA_MEM_TO_MEM); + od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + od->ddev.dev = &pdev->dev; + INIT_LIST_HEAD(&od->ddev.channels); |