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authorVinod Koul <vinod.koul@intel.com>2017-08-22 19:33:43 +0300
committerVinod Koul <vinod.koul@intel.com>2017-08-22 19:33:43 +0300
commit491bea00a13600eaa146923b910b70e9a326e950 (patch)
tree06963b79f67db3f739be43efe8149a3574442da6 /drivers/dma
parenta85c6f1b2921cbd2f54666a52804f407c4a064fe (diff)
downloadlinux-491bea00a13600eaa146923b910b70e9a326e950.tar.xz
dmaengine: altera: remove DMA_SG
Commit c678fa66341c: ("dmaengine: remove DMA_SG as it is dead code in kernel") removes DMA_SG from dmaengine subsystem but missed the newly added driver, so remove it from here as well Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/altera-msgdma.c94
1 files changed, 0 insertions, 94 deletions
diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c
index 33b87b413793..75208b43d137 100644
--- a/drivers/dma/altera-msgdma.c
+++ b/drivers/dma/altera-msgdma.c
@@ -386,98 +386,6 @@ msgdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
}
/**
- * msgdma_prep_sg - prepare descriptors for a memory sg transaction
- * @dchan: DMA channel
- * @dst_sg: Destination scatter list
- * @dst_sg_len: Number of entries in destination scatter list
- * @src_sg: Source scatter list
- * @src_sg_len: Number of entries in source scatter list
- * @flags: transfer ack flags
- *
- * Return: Async transaction descriptor on success and NULL on failure
- */
-static struct dma_async_tx_descriptor *
-msgdma_prep_sg(struct dma_chan *dchan, struct scatterlist *dst_sg,
- unsigned int dst_sg_len, struct scatterlist *src_sg,
- unsigned int src_sg_len, unsigned long flags)
-{
- struct msgdma_device *mdev = to_mdev(dchan);
- struct msgdma_sw_desc *new, *first = NULL;
- void *desc = NULL;
- size_t len, dst_avail, src_avail;
- dma_addr_t dma_dst, dma_src;
- u32 desc_cnt = 0, i;
- struct scatterlist *sg;
-
- for_each_sg(src_sg, sg, src_sg_len, i)
- desc_cnt += DIV_ROUND_UP(sg_dma_len(sg), MSGDMA_MAX_TRANS_LEN);
-
- spin_lock_bh(&mdev->lock);
- if (desc_cnt > mdev->desc_free_cnt) {
- spin_unlock_bh(&mdev->lock);
- dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);
- return NULL;
- }
- mdev->desc_free_cnt -= desc_cnt;
- spin_unlock_bh(&mdev->lock);
-
- dst_avail = sg_dma_len(dst_sg);
- src_avail = sg_dma_len(src_sg);
-
- /* Run until we are out of scatterlist entries */
- while (true) {
- /* Allocate and populate the descriptor */
- new = msgdma_get_descriptor(mdev);
-
- desc = &new->hw_desc;
- len = min_t(size_t, src_avail, dst_avail);
- len = min_t(size_t, len, MSGDMA_MAX_TRANS_LEN);
- if (len == 0)
- goto fetch;
- dma_dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) -
- dst_avail;
- dma_src = sg_dma_address(src_sg) + sg_dma_len(src_sg) -
- src_avail;
-
- msgdma_desc_config(desc, dma_dst, dma_src, len,
- MSGDMA_DESC_STRIDE_RW);
- dst_avail -= len;
- src_avail -= len;
-
- if (!first)
- first = new;
- else
- list_add_tail(&new->node, &first->tx_list);
-fetch:
- /* Fetch the next dst scatterlist entry */
- if (dst_avail == 0) {
- if (dst_sg_len == 0)
- break;
- dst_sg = sg_next(dst_sg);
- if (dst_sg == NULL)
- break;
- dst_sg_len--;
- dst_avail = sg_dma_len(dst_sg);
- }
- /* Fetch the next src scatterlist entry */
- if (src_avail == 0) {
- if (src_sg_len == 0)
- break;
- src_sg = sg_next(src_sg);
- if (src_sg == NULL)
- break;
- src_sg_len--;
- src_avail = sg_dma_len(src_sg);
- }
- }
-
- msgdma_desc_config_eod(desc);
- first->async_tx.flags = flags;
-
- return &first->async_tx;
-}
-
-/**
* msgdma_prep_slave_sg - prepare descriptors for a slave sg transaction
*
* @dchan: DMA channel
@@ -943,7 +851,6 @@ static int msgdma_probe(struct platform_device *pdev)
/* Set DMA capabilities */
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
- dma_cap_set(DMA_SG, dma_dev->cap_mask);
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
@@ -962,7 +869,6 @@ static int msgdma_probe(struct platform_device *pdev)
dma_dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
dma_dev->device_prep_dma_memcpy = msgdma_prep_memcpy;
- dma_dev->device_prep_dma_sg = msgdma_prep_sg;
dma_dev->device_prep_slave_sg = msgdma_prep_slave_sg;
dma_dev->device_config = msgdma_dma_config;