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Subject[PATCH 2/4] b43legacy: simplify engine type / DMA mask selection
Date
Return the engine type from the function looking at the registers, and
just derive the DMA mask from that in the one place we care.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/net/wireless/broadcom/b43legacy/dma.c | 20 +++----------------
1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/broadcom/b43legacy/dma.c b/drivers/net/wireless/broadcom/b43legacy/dma.c
index 0c2de20622e3..e66d05ae2466 100644
--- a/drivers/net/wireless/broadcom/b43legacy/dma.c
+++ b/drivers/net/wireless/broadcom/b43legacy/dma.c
@@ -616,7 +616,7 @@ static void free_all_descbuffers(struct b43legacy_dmaring *ring)
}
}

-static u64 supported_dma_mask(struct b43legacy_wldev *dev)
+static enum b43legacy_dmatype b43legacy_engine_type(struct b43legacy_wldev *dev)
{
u32 tmp;
u16 mmio_base;
@@ -628,18 +628,7 @@ static u64 supported_dma_mask(struct b43legacy_wldev *dev)
tmp = b43legacy_read32(dev, mmio_base +
B43legacy_DMA32_TXCTL);
if (tmp & B43legacy_DMA32_TXADDREXT_MASK)
- return DMA_BIT_MASK(32);
-
- return DMA_BIT_MASK(30);
-}
-
-static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask)
-{
- if (dmamask == DMA_BIT_MASK(30))
- return B43legacy_DMA_30BIT;
- if (dmamask == DMA_BIT_MASK(32))
return B43legacy_DMA_32BIT;
- B43legacy_WARN_ON(1);
return B43legacy_DMA_30BIT;
}

@@ -801,13 +790,10 @@ int b43legacy_dma_init(struct b43legacy_wldev *dev)
{
struct b43legacy_dma *dma = &dev->dma;
struct b43legacy_dmaring *ring;
+ enum b43legacy_dmatype type = b43legacy_engine_type(dev);
int err;
- u64 dmamask;
- enum b43legacy_dmatype type;

- dmamask = supported_dma_mask(dev);
- type = dma_mask_to_engine_type(dmamask);
- err = dma_set_mask_and_coherent(dev->dev->dma_dev, dmamask);
+ err = dma_set_mask_and_coherent(dev->dev->dma_dev, DMA_BIT_MASK(type));
if (err) {
#ifdef CONFIG_B43LEGACY_PIO
b43legacywarn(dev->wl, "DMA for this device not supported. "
--
2.20.1
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