diff options
author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-10-22 11:40:59 +0200 |
---|---|---|
committer | Vinod Koul <vinod.koul@intel.com> | 2015-10-29 02:40:09 +0100 |
commit | ce2a673d66b2cab4b459981be1a28bbb6c071555 (patch) | |
tree | fed6fe66f0a8b2d5379c7e587a1bc165472a6adc /drivers/dma | |
parent | Merge branch 'topic/dw' into for-linus (diff) | |
download | linux-ce2a673d66b2cab4b459981be1a28bbb6c071555.tar.xz linux-ce2a673d66b2cab4b459981be1a28bbb6c071555.zip |
dmaengine: hdmac: factorise memset descriptor allocation
The memset and scatter gathered memset are going to use some common logic
to create their descriptors.
Move that logic into a function of its own so that we can share it with the
future memset_sg callback.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/at_hdmac.c | 97 | ||||
-rw-r--r-- | drivers/dma/at_hdmac_regs.h | 2 |
2 files changed, 58 insertions, 41 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 58d406230d89..cad18f3660ae 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -458,10 +458,10 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) dma_cookie_complete(txd); /* If the transfer was a memset, free our temporary buffer */ - if (desc->memset) { + if (desc->memset_buffer) { dma_pool_free(atdma->memset_pool, desc->memset_vaddr, desc->memset_paddr); - desc->memset = false; + desc->memset_buffer = false; } /* move children to free_list */ @@ -881,6 +881,46 @@ err_desc_get: return NULL; } +static struct at_desc *atc_create_memset_desc(struct dma_chan *chan, + dma_addr_t psrc, + dma_addr_t pdst, + size_t len) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_desc *desc; + size_t xfer_count; + + u32 ctrla = ATC_SRC_WIDTH(2) | ATC_DST_WIDTH(2); + u32 ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN | + ATC_SRC_ADDR_MODE_FIXED | + ATC_DST_ADDR_MODE_INCR | + ATC_FC_MEM2MEM; + + xfer_count = len >> 2; + if (xfer_count > ATC_BTSIZE_MAX) { + dev_err(chan2dev(chan), "%s: buffer is too big\n", + __func__); + return NULL; + } + + desc = atc_desc_get(atchan); + if (!desc) { + dev_err(chan2dev(chan), "%s: can't get a descriptor\n", + __func__); + return NULL; + } + + desc->lli.saddr = psrc; + desc->lli.daddr = pdst; + desc->lli.ctrla = ctrla | xfer_count; + desc->lli.ctrlb = ctrlb; + + desc->txd.cookie = 0; + desc->len = len; + + return desc; +} + /** * atc_prep_dma_memset - prepare a memcpy operation * @chan: the channel to prepare operation on @@ -893,12 +933,10 @@ static struct dma_async_tx_descriptor * atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, size_t len, unsigned long flags) { - struct at_dma_chan *atchan = to_at_dma_chan(chan); struct at_dma *atdma = to_at_dma(chan->device); - struct at_desc *desc = NULL; - size_t xfer_count; - u32 ctrla; - u32 ctrlb; + struct at_desc *desc; + void __iomem *vaddr; + dma_addr_t paddr; dev_vdbg(chan2dev(chan), "%s: d0x%x v0x%x l0x%zx f0x%lx\n", __func__, dest, value, len, flags); @@ -914,46 +952,26 @@ atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, return NULL; } - xfer_count = len >> 2; - if (xfer_count > ATC_BTSIZE_MAX) { - dev_err(chan2dev(chan), "%s: buffer is too big\n", + vaddr = dma_pool_alloc(atdma->memset_pool, GFP_ATOMIC, &paddr); + if (!vaddr) { + dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n", __func__); return NULL; } + *(u32*)vaddr = value; - ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN - | ATC_SRC_ADDR_MODE_FIXED - | ATC_DST_ADDR_MODE_INCR - | ATC_FC_MEM2MEM; - - ctrla = ATC_SRC_WIDTH(2) | - ATC_DST_WIDTH(2); - - desc = atc_desc_get(atchan); + desc = atc_create_memset_desc(chan, paddr, dest, len); if (!desc) { - dev_err(chan2dev(chan), "%s: can't get a descriptor\n", + dev_err(chan2dev(chan), "%s: couldn't get a descriptor\n", __func__); - return NULL; + goto err_free_buffer; } - desc->memset_vaddr = dma_pool_alloc(atdma->memset_pool, GFP_ATOMIC, - &desc->memset_paddr); - if (!desc->memset_vaddr) { - dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n", - __func__); - goto err_put_desc; - } - - *desc->memset_vaddr = value; - desc->memset = true; - - desc->lli.saddr = desc->memset_paddr; - desc->lli.daddr = dest; - desc->lli.ctrla = ctrla | xfer_count; - desc->lli.ctrlb = ctrlb; + desc->memset_paddr = paddr; + desc->memset_vaddr = vaddr; + desc->memset_buffer = true; desc->txd.cookie = -EBUSY; - desc->len = len; desc->total_len = len; /* set end-of-link on the descriptor */ @@ -963,12 +981,11 @@ atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, return &desc->txd; -err_put_desc: - atc_desc_put(atchan, desc); +err_free_buffer: + dma_pool_free(atdma->memset_pool, vaddr, paddr); return NULL; } - /** * atc_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction * @chan: DMA channel diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index c3bebbe899ac..d1cfc8c876f9 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -202,7 +202,7 @@ struct at_desc { size_t src_hole; /* Memset temporary buffer */ - bool memset; + bool memset_buffer; dma_addr_t memset_paddr; int *memset_vaddr; }; |