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author | Dave Jiang <dave.jiang@intel.com> | 2017-08-21 10:23:13 -0700 |
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committer | Vinod Koul <vinod.koul@intel.com> | 2017-08-22 09:22:11 +0530 |
commit | c678fa66341c7b82a57cfed0ba3656162e970f99 (patch) | |
tree | 1573dfbd3e1afb9ea57a8231183f836e51e12c43 /drivers/dma/xilinx | |
parent | 61b5f54d8c1fafb97dace958a54cdd72b37138c3 (diff) | |
download | linux-stable-c678fa66341c7b82a57cfed0ba3656162e970f99.tar.gz linux-stable-c678fa66341c7b82a57cfed0ba3656162e970f99.tar.bz2 linux-stable-c678fa66341c7b82a57cfed0ba3656162e970f99.zip |
dmaengine: remove DMA_SG as it is dead code in kernel
There are no in kernel consumers for DMA_SG op. Removing operation,
dead code, and test code in dmatest.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/xilinx')
-rw-r--r-- | drivers/dma/xilinx/zynqmp_dma.c | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c index 47f64192d2fd..1ee1241ca797 100644 --- a/drivers/dma/xilinx/zynqmp_dma.c +++ b/drivers/dma/xilinx/zynqmp_dma.c @@ -830,98 +830,6 @@ static struct dma_async_tx_descriptor *zynqmp_dma_prep_memcpy( } /** - * zynqmp_dma_prep_slave_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 *zynqmp_dma_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 zynqmp_dma_desc_sw *new, *first = NULL; - struct zynqmp_dma_chan *chan = to_chan(dchan); - void *desc = NULL, *prev = 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), - ZYNQMP_DMA_MAX_TRANS_LEN); - - spin_lock_bh(&chan->lock); - if (desc_cnt > chan->desc_free_cnt) { - spin_unlock_bh(&chan->lock); - dev_dbg(chan->dev, "chan %p descs are not available\n", chan); - return NULL; - } - chan->desc_free_cnt = chan->desc_free_cnt - desc_cnt; - spin_unlock_bh(&chan->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 = zynqmp_dma_get_descriptor(chan); - desc = (struct zynqmp_dma_desc_ll *)new->src_v; - len = min_t(size_t, src_avail, dst_avail); - len = min_t(size_t, len, ZYNQMP_DMA_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; - - zynqmp_dma_config_sg_ll_desc(chan, desc, dma_src, dma_dst, - len, prev); - prev = desc; - 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); - } - } - - zynqmp_dma_desc_config_eod(chan, desc); - first->async_tx.flags = flags; - return &first->async_tx; -} - -/** * zynqmp_dma_chan_remove - Channel remove function * @chan: ZynqMP DMA channel pointer */ @@ -1064,11 +972,9 @@ static int zynqmp_dma_probe(struct platform_device *pdev) INIT_LIST_HEAD(&zdev->common.channels); dma_set_mask(&pdev->dev, DMA_BIT_MASK(44)); - dma_cap_set(DMA_SG, zdev->common.cap_mask); dma_cap_set(DMA_MEMCPY, zdev->common.cap_mask); p = &zdev->common; - p->device_prep_dma_sg = zynqmp_dma_prep_sg; p->device_prep_dma_memcpy = zynqmp_dma_prep_memcpy; p->device_terminate_all = zynqmp_dma_device_terminate_all; p->device_issue_pending = zynqmp_dma_issue_pending; |