diff options
| -rw-r--r-- | drivers/net/wireless/b43legacy/dma.c | 66 |
1 files changed, 51 insertions, 15 deletions
diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c index eb0243a2269..fb6819e40f3 100644 --- a/drivers/net/wireless/b43legacy/dma.c +++ b/drivers/net/wireless/b43legacy/dma.c @@ -859,6 +859,18 @@ static u64 supported_dma_mask(struct b43legacy_wldev *dev) return DMA_30BIT_MASK; } +static enum b43legacy_dmatype dma_mask_to_engine_type(u64 dmamask) +{ + if (dmamask == DMA_30BIT_MASK) + return B43legacy_DMA_30BIT; + if (dmamask == DMA_32BIT_MASK) + return B43legacy_DMA_32BIT; + if (dmamask == DMA_64BIT_MASK) + return B43legacy_DMA_64BIT; + B43legacy_WARN_ON(1); + return B43legacy_DMA_30BIT; +} + /* Main initialization function. */ static struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev, @@ -1018,6 +1030,43 @@ void b43legacy_dma_free(struct b43legacy_wldev *dev) dma->tx_ring0 = NULL; } +static int b43legacy_dma_set_mask(struct b43legacy_wldev *dev, u64 mask) +{ + u64 orig_mask = mask; + bool fallback = 0; + int err; + + /* Try to set the DMA mask. If it fails, try falling back to a + * lower mask, as we can always also support a lower one. */ + while (1) { + err = ssb_dma_set_mask(dev->dev, mask); + if (!err) + break; + if (mask == DMA_64BIT_MASK) { + mask = DMA_32BIT_MASK; + fallback = 1; + continue; + } + if (mask == DMA_32BIT_MASK) { + mask = DMA_30BIT_MASK; + fallback = 1; + continue; + } + b43legacyerr(dev->wl, "The machine/kernel does not support " + "the required %u-bit DMA mask\n", + (unsigned int)dma_mask_to_engine_type(orig_mask)); + return -EOPNOTSUPP; + } + if (fallback) { + b43legacyinfo(dev->wl, "DMA mask fallback from %u-bit to %u-" + "bit\n", + (unsigned int)dma_mask_to_engine_type(orig_mask), + (unsigned int)dma_mask_to_engine_type(mask)); + } + + return 0; +} + int b43legacy_dma_init(struct b43legacy_wldev *dev) { struct b43legacy_dma *dma = &dev->dma; @@ -1027,21 +1076,8 @@ int b43legacy_dma_init(struct b43legacy_wldev *dev) enum b43legacy_dmatype type; dmamask = supported_dma_mask(dev); - switch (dmamask) { - default: - B43legacy_WARN_ON(1); - case DMA_30BIT_MASK: - type = B43legacy_DMA_30BIT; - break; - case DMA_32BIT_MASK: - type = B43legacy_DMA_32BIT; - break; - case DMA_64BIT_MASK: - type = B43legacy_DMA_64BIT; - break; - } - - err = ssb_dma_set_mask(dev->dev, dmamask); + type = dma_mask_to_engine_type(dmamask); + err = b43legacy_dma_set_mask(dev, dmamask); if (err) { #ifdef CONFIG_B43LEGACY_PIO b43legacywarn(dev->wl, "DMA for this device not supported. " |