Most of the DMA transfer parameters that are configured for scatter-gather
or cyclic transfers are the same. Therefore, move the setup of common
parameters into the tegra_dma_get_xfer_params() function used for both
scatter-gather and cyclic transfers.
Note that TEGRA_APBDMA_AHBSEQ_WRAP_NONE is defined as 0 and so this setting
can be completely removed.
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
drivers/dma/tegra20-apb-dma.c | 53 ++++++++++++++++---------------------------
1 file changed, 19 insertions(+), 34 deletions(-)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index e552a4efef71..c1eb25075756 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -940,7 +940,8 @@ static inline int get_burst_size(struct tegra_dma_channel *tdc,
static int tegra_dma_get_xfer_params(struct tegra_dma_channel *tdc,
struct tegra_dma_channel_regs *ch_regs,
- enum dma_transfer_direction direction)
+ enum dma_transfer_direction direction,
+ unsigned int flags)
{
switch (direction) {
case DMA_MEM_TO_DEV:
@@ -948,48 +949,32 @@ static int tegra_dma_get_xfer_params(struct tegra_dma_channel *tdc,
ch_regs->apb_seq = get_bus_width(tdc,
tdc->dma_sconfig.dst_addr_width);
ch_regs->csr = TEGRA_APBDMA_CSR_DIR;
- return 0;
+ break;
case DMA_DEV_TO_MEM:
ch_regs->apb_ptr = tdc->dma_sconfig.src_addr;
ch_regs->apb_seq = get_bus_width(tdc,
tdc->dma_sconfig.src_addr_width);
ch_regs->csr = 0;
- return 0;
+ break;
default:
dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
return -EINVAL;
}
- return -EINVAL;
-}
-
-static int tegra_dma_get_xfer_params_sg(struct tegra_dma_channel *tdc,
- struct tegra_dma_sg_req *sg_req,
- enum dma_transfer_direction direction,
- unsigned int flags)
-{
- struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
- int ret;
-
- ret = tegra_dma_get_xfer_params(tdc, ch_regs, direction);
- if (ret < 0)
- return ret;
+ ch_regs->apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
ch_regs->ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
- ch_regs->ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
- TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
ch_regs->ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
- ch_regs->csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
+ ch_regs->csr |= TEGRA_APBDMA_CSR_FLOW;
ch_regs->csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+
if (flags & DMA_PREP_INTERRUPT)
ch_regs->csr |= TEGRA_APBDMA_CSR_IE_EOC;
- ch_regs->apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
-
return 0;
}
-static int tegra_dma_get_xfer_params_cyclic(struct tegra_dma_channel *tdc,
+static int tegra_dma_get_xfer_params_sg(struct tegra_dma_channel *tdc,
struct tegra_dma_sg_req *sg_req,
enum dma_transfer_direction direction,
unsigned int flags)
@@ -997,23 +982,23 @@ static int tegra_dma_get_xfer_params_cyclic(struct tegra_dma_channel *tdc,
struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
int ret;
- ret = tegra_dma_get_xfer_params(tdc, ch_regs, direction);
+ ret = tegra_dma_get_xfer_params(tdc, ch_regs, direction, flags);
if (ret < 0)
return ret;
- ch_regs->ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
- ch_regs->ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
- TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
- ch_regs->ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
+ ch_regs->csr |= TEGRA_APBDMA_CSR_ONCE;
- ch_regs->csr |= TEGRA_APBDMA_CSR_FLOW;
- if (flags & DMA_PREP_INTERRUPT)
- ch_regs->csr |= TEGRA_APBDMA_CSR_IE_EOC;
- ch_regs->csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
+ return 0;
+}
- ch_regs->apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
+static int tegra_dma_get_xfer_params_cyclic(struct tegra_dma_channel *tdc,
+ struct tegra_dma_sg_req *sg_req,
+ enum dma_transfer_direction direction,
+ unsigned int flags)
+{
+ struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
- return 0;
+ return tegra_dma_get_xfer_params(tdc, ch_regs, direction, flags);
}
static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
--
2.1.4
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