dmaengine: tegra-apb: Avoid unnecessary channel base address calculation
Everytime a DMA channel register is accessed, the channel base address
is calculated by adding the DMA base address and the channel register
offset. Avoid this calculation and simply calculate the channel base
address once at probe time for each DMA channel.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index cf8cff7..11edcca 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -187,7 +187,7 @@
bool config_init;
int id;
int irq;
- unsigned long chan_base_offset;
+ void __iomem *chan_addr;
spinlock_t lock;
bool busy;
struct tegra_dma *tdma;
@@ -239,12 +239,12 @@
static inline void tdc_write(struct tegra_dma_channel *tdc,
u32 reg, u32 val)
{
- writel(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+ writel(val, tdc->chan_addr + reg);
}
static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
{
- return readl(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
+ return readl(tdc->chan_addr + reg);
}
static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
@@ -1373,8 +1373,9 @@
for (i = 0; i < cdata->nr_channels; i++) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
- tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
- i * cdata->channel_reg_size;
+ tdc->chan_addr = tdma->base_addr +
+ TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
+ (i * cdata->channel_reg_size);
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
if (!res) {