drivers/dma: remove unused support for MEMSET operations

There have never been any real users of MEMSET operations since they
have been introduced in January 2007 by commit 7405f74badf4 ("dmaengine:
refactor dmaengine around dma_async_tx_descriptor").  Therefore remove
support for them for now, it can be always brought back when needed.

[sebastian.hesselbarth@gmail.com: fix drivers/dma/mv_xor]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Olof Johansson <olof@lixom.net>
Cc: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 47 deletions

diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
index 5d3d95569a1e..1e220f8dfd8c 100644
--- a/drivers/dma/ppc4xx/adma.c
+++ b/drivers/dma/ppc4xx/adma.c
@@ -2323,47 +2323,6 @@ static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy(
 }
 
 /**
- * ppc440spe_adma_prep_dma_memset - prepare CDB for a MEMSET operation
- */
-static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memset(
-                struct dma_chan *chan, dma_addr_t dma_dest, int value,
-                size_t len, unsigned long flags)
-{
-        struct ppc440spe_adma_chan *ppc440spe_chan;
-        struct ppc440spe_adma_desc_slot *sw_desc, *group_start;
-        int slot_cnt, slots_per_op;
-
-        ppc440spe_chan = to_ppc440spe_adma_chan(chan);
-
-        if (unlikely(!len))
-                return NULL;
-
-        BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT);
-
-        spin_lock_bh(&ppc440spe_chan->lock);
-
-        dev_dbg(ppc440spe_chan->device->common.dev,
-                "ppc440spe adma%d: %s cal: %u len: %u int_en %d\n",
-                ppc440spe_chan->device->id, __func__, value, len,
-                flags & DMA_PREP_INTERRUPT ? 1 : 0);
-
-        slot_cnt = slots_per_op = 1;
-        sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt,
-                slots_per_op);
-        if (sw_desc) {
-                group_start = sw_desc->group_head;
-                ppc440spe_desc_init_memset(group_start, value, flags);
-                ppc440spe_adma_set_dest(group_start, dma_dest, 0);
-                ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len);
-                sw_desc->unmap_len = len;
-                sw_desc->async_tx.flags = flags;
-        }
-        spin_unlock_bh(&ppc440spe_chan->lock);
-
-        return sw_desc ? &sw_desc->async_tx : NULL;
-}
-
-/**
  * ppc440spe_adma_prep_dma_xor - prepare CDB for a XOR operation
  */
 static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor(
@@ -4125,7 +4084,6 @@ static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev)
         case PPC440SPE_DMA1_ID:
                 dma_cap_set(DMA_MEMCPY, adev->common.cap_mask);
                 dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask);
-                dma_cap_set(DMA_MEMSET, adev->common.cap_mask);
                 dma_cap_set(DMA_PQ, adev->common.cap_mask);
                 dma_cap_set(DMA_PQ_VAL, adev->common.cap_mask);
                 dma_cap_set(DMA_XOR_VAL, adev->common.cap_mask);
@@ -4151,10 +4109,6 @@ static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev)
                 adev->common.device_prep_dma_memcpy =
                         ppc440spe_adma_prep_dma_memcpy;
         }
-        if (dma_has_cap(DMA_MEMSET, adev->common.cap_mask)) {
-                adev->common.device_prep_dma_memset =
-                        ppc440spe_adma_prep_dma_memset;
-        }
         if (dma_has_cap(DMA_XOR, adev->common.cap_mask)) {
                 adev->common.max_xor = XOR_MAX_OPS;
                 adev->common.device_prep_dma_xor =
@@ -4217,7 +4171,6 @@ static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev)
           dma_has_cap(DMA_XOR, adev->common.cap_mask) ? "xor " : "",
           dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask) ? "xor_val " : "",
           dma_has_cap(DMA_MEMCPY, adev->common.cap_mask) ? "memcpy " : "",
-          dma_has_cap(DMA_MEMSET, adev->common.cap_mask)  ? "memset " : "",
           dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask) ? "intr " : "");
 }