dab5a44067
n As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
87 lines
3.4 KiB
Diff
87 lines
3.4 KiB
Diff
From 5e439596e0a4a5a14556d8b3f246e7204a8f3cd0 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);
|