[PATCH 3/3] dmaengine: at_hdmac: add slave config operation
STALE5542d
From: Nicolas Ferre <hidden>
Date: 2011-06-28 10:15:40
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, microchip at91 dma drivers, the rest · Maintainers:
Vinod Koul, Ludovic Desroches, Linus Torvalds
Only change source/destination peripheral register access width. Signed-off-by: Nicolas Ferre <redacted> Signed-off-by: Uwe Kleine-K?nig <redacted> --- drivers/dma/at_hdmac.c | 29 +++++++++++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 7096adb..9cb8044 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c@@ -954,6 +954,35 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, clear_bit(ATC_IS_PAUSED, &atchan->status); spin_unlock_irqrestore(&atchan->lock, flags); + } else if (cmd == DMA_SLAVE_CONFIG) { + struct dma_slave_config *dmaengine_cfg = (void *)arg; + struct at_dma_slave *atslave = chan->private; + enum dma_slave_buswidth sdma_width; + enum at_dma_slave_width atdma_width; + + /* only modify transfer size width */ + if (!atslave) + return -ENXIO; + + if (dmaengine_cfg->direction == DMA_FROM_DEVICE) + sdma_width = dmaengine_cfg->src_addr_width; + else + sdma_width = dmaengine_cfg->dst_addr_width; + + switch (sdma_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + atdma_width = AT_DMA_SLAVE_WIDTH_8BIT; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + atdma_width = AT_DMA_SLAVE_WIDTH_16BIT; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + atdma_width = AT_DMA_SLAVE_WIDTH_32BIT; + break; + default: + return -EINVAL; + } + atslave->reg_width = atdma_width; } else if (cmd == DMA_TERMINATE_ALL) { struct at_desc *desc, *_desc; /*
--
1.7.3