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authorDave Jiang <dave.jiang@intel.com>2017-08-21 10:23:13 -0700
committerVinod Koul <vinod.koul@intel.com>2017-08-22 09:22:11 +0530
commitc678fa66341c7b82a57cfed0ba3656162e970f99 (patch)
tree1573dfbd3e1afb9ea57a8231183f836e51e12c43 /drivers/dma/xgene-dma.c
parent61b5f54d8c1fafb97dace958a54cdd72b37138c3 (diff)
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/xgene-dma.c')
-rw-r--r--drivers/dma/xgene-dma.c155
1 files changed, 1 insertions, 154 deletions
diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index 8b693b712d0f..8648d2394ab6 100644
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -425,48 +425,6 @@ static void xgene_dma_init_desc(struct xgene_dma_desc_hw *desc,
XGENE_DMA_DESC_HOENQ_NUM_POS);
}
-static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan,
- struct xgene_dma_desc_sw *desc_sw,
- dma_addr_t dst, dma_addr_t src,
- size_t len)
-{
- struct xgene_dma_desc_hw *desc1, *desc2;
- int i;
-
- /* Get 1st descriptor */
- desc1 = &desc_sw->desc1;
- xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num);
-
- /* Set destination address */
- desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT);
- desc1->m3 |= cpu_to_le64(dst);
-
- /* Set 1st source address */
- xgene_dma_set_src_buffer(&desc1->m1, &len, &src);
-
- if (!len)
- return;
-
- /*
- * We need to split this source buffer,
- * and need to use 2nd descriptor
- */
- desc2 = &desc_sw->desc2;
- desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT);
-
- /* Set 2nd to 5th source address */
- for (i = 0; i < 4 && len; i++)
- xgene_dma_set_src_buffer(xgene_dma_lookup_ext8(desc2, i),
- &len, &src);
-
- /* Invalidate unused source address field */
- for (; i < 4; i++)
- xgene_dma_invalidate_buffer(xgene_dma_lookup_ext8(desc2, i));
-
- /* Updated flag that we have prepared 64B descriptor */
- desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC;
-}
-
static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan,
struct xgene_dma_desc_sw *desc_sw,
dma_addr_t *dst, dma_addr_t *src,
@@ -891,114 +849,6 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
chan->desc_pool = NULL;
}
-static struct dma_async_tx_descriptor *xgene_dma_prep_sg(
- struct dma_chan *dchan, struct scatterlist *dst_sg,
- u32 dst_nents, struct scatterlist *src_sg,
- u32 src_nents, unsigned long flags)
-{
- struct xgene_dma_desc_sw *first = NULL, *new = NULL;
- struct xgene_dma_chan *chan;
- size_t dst_avail, src_avail;
- dma_addr_t dst, src;
- size_t len;
-
- if (unlikely(!dchan))
- return NULL;
-
- if (unlikely(!dst_nents || !src_nents))
- return NULL;
-
- if (unlikely(!dst_sg || !src_sg))
- return NULL;
-
- chan = to_dma_chan(dchan);
-
- /* Get prepared for the loop */
- dst_avail = sg_dma_len(dst_sg);
- src_avail = sg_dma_len(src_sg);
- dst_nents--;
- src_nents--;
-
- /* Run until we are out of scatterlist entries */
- while (true) {
- /* Create the largest transaction possible */
- len = min_t(size_t, src_avail, dst_avail);
- len = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT);
- if (len == 0)
- goto fetch;
-
- dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
- src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
-
- /* Allocate the link descriptor from DMA pool */
- new = xgene_dma_alloc_descriptor(chan);
- if (!new)
- goto fail;
-
- /* Prepare DMA descriptor */
- xgene_dma_prep_cpy_desc(chan, new, dst, src, len);
-
- if (!first)
- first = new;
-
- new->tx.cookie = 0;
- async_tx_ack(&new->tx);
-
- /* update metadata */
- dst_avail -= len;
- src_avail -= len;
-
- /* Insert the link descriptor to the LD ring */
- list_add_tail(&new->node, &first->tx_list);
-
-fetch:
- /* fetch the next dst scatterlist entry */
- if (dst_avail == 0) {
- /* no more entries: we're done */
- if (dst_nents == 0)
- break;
-
- /* fetch the next entry: if there are no more: done */
- dst_sg = sg_next(dst_sg);
- if (!dst_sg)
- break;
-
- dst_nents--;
- dst_avail = sg_dma_len(dst_sg);
- }
-
- /* fetch the next src scatterlist entry */
- if (src_avail == 0) {
- /* no more entries: we're done */
- if (src_nents == 0)
- break;
-
- /* fetch the next entry: if there are no more: done */
- src_sg = sg_next(src_sg);
- if (!src_sg)
- break;
-
- src_nents--;
- src_avail = sg_dma_len(src_sg);
- }
- }
-
- if (!new)
- return NULL;
-
- new->tx.flags = flags; /* client is in control of this ack */
- new->tx.cookie = -EBUSY;
- list_splice(&first->tx_list, &new->tx_list);
-
- return &new->tx;
-fail:
- if (!first)
- return NULL;
-
- xgene_dma_free_desc_list(chan, &first->tx_list);
- return NULL;
-}
-
static struct dma_async_tx_descriptor *xgene_dma_prep_xor(
struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src,
u32 src_cnt, size_t len, unsigned long flags)
@@ -1653,7 +1503,6 @@ static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
dma_cap_zero(dma_dev->cap_mask);
/* Set DMA device capability */
- dma_cap_set(DMA_SG, dma_dev->cap_mask);
/* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
* and channel 1 supports XOR, PQ both. First thing here is we have
@@ -1679,7 +1528,6 @@ static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources;
dma_dev->device_issue_pending = xgene_dma_issue_pending;
dma_dev->device_tx_status = xgene_dma_tx_status;
- dma_dev->device_prep_dma_sg = xgene_dma_prep_sg;
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
@@ -1731,8 +1579,7 @@ static int xgene_dma_async_register(struct xgene_dma *pdma, int id)
/* DMA capability info */
dev_info(pdma->dev,
- "%s: CAPABILITY ( %s%s%s)\n", dma_chan_name(&chan->dma_chan),
- dma_has_cap(DMA_SG, dma_dev->cap_mask) ? "SGCPY " : "",
+ "%s: CAPABILITY ( %s%s)\n", dma_chan_name(&chan->dma_chan),
dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "",
dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : "");