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| author | Feng Tang <feng.tang@intel.com> | 2010-12-02 17:14:30 +0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2010-12-04 15:09:50 -0800 |
| commit | 0be035f3485379d812d617ee7eaa255cde97dbfa (patch) | |
| tree | 42b298c929d3100229112bc0fa1f88166f788622 /drivers/dma/intel_mid_dma.c | |
| parent | 66bde0b70aa2e348ac2c9b9626743c1402b9d466 (diff) | |
| download | linux-0be035f3485379d812d617ee7eaa255cde97dbfa.tar.gz linux-0be035f3485379d812d617ee7eaa255cde97dbfa.tar.bz2 linux-0be035f3485379d812d617ee7eaa255cde97dbfa.zip | |
intel_mid_dma: add support for single item scatter-gather list
Current driver's device_prep_slave_sg can't be used by DMAC2 even
the sg list contains one item, this patch will enable DMAC2 to
use this API.
Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/intel_mid_dma.c')
| -rw-r--r-- | drivers/dma/intel_mid_dma.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c index 41941d05bfb9..0c0feb8834d0 100644 --- a/drivers/dma/intel_mid_dma.c +++ b/drivers/dma/intel_mid_dma.c @@ -664,11 +664,20 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy( /*calculate CTL_LO*/ ctl_lo.ctl_lo = 0; ctl_lo.ctlx.int_en = 1; - ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width; - ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width; ctl_lo.ctlx.dst_msize = mids->dma_slave.src_maxburst; ctl_lo.ctlx.src_msize = mids->dma_slave.dst_maxburst; + /* + * Here we need some translation from "enum dma_slave_buswidth" + * to the format for our dma controller + * standard intel_mid_dmac's format + * 1 Byte 0b000 + * 2 Bytes 0b001 + * 4 Bytes 0b010 + */ + ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width / 2; + ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width / 2; + if (mids->cfg_mode == LNW_DMA_MEM_TO_MEM) { ctl_lo.ctlx.tt_fc = 0; ctl_lo.ctlx.sinc = 0; @@ -746,8 +755,18 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg( BUG_ON(!mids); if (!midc->dma->pimr_mask) { - pr_debug("MDMA: SG list is not supported by this controller\n"); - return NULL; + /* We can still handle sg list with only one item */ + if (sg_len == 1) { + txd = intel_mid_dma_prep_memcpy(chan, + mids->dma_slave.dst_addr, + mids->dma_slave.src_addr, + sgl->length, + flags); + return txd; + } else { + pr_warn("MDMA: SG list is not supported by this controller\n"); + return NULL; + } } pr_debug("MDMA: SG Length = %d, direction = %d, Flags = %#lx\n", @@ -758,6 +777,7 @@ static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg( pr_err("MDMA: Prep memcpy failed\n"); return NULL; } + desc = to_intel_mid_dma_desc(txd); desc->dirn = direction; ctl_lo.ctl_lo = desc->ctl_lo; |