diff options
| author | Michael Buesch <mb@bu3sch.de> | 2008-03-29 23:01:16 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-04-08 23:05:56 +0400 |
| commit | 5100d5ac81b9330dc57e35adbe50923ba6107b8f (patch) | |
| tree | 48224236b50703606c97c05ec077fde4880fc3b9 /drivers/net/wireless/b43/dma.h | |
| parent | 3109ece1114293b8201d9c140d02d7ce9a9fa387 (diff) | |
| download | linux-5100d5ac81b9330dc57e35adbe50923ba6107b8f.tar.xz | |
b43: Add PIO support for PCMCIA devices
This adds PIO support back (D'oh!) for PCMCIA devices.
This is a complete rewrite of the old PIO code. It does actually work
and we get reasonable performance out of it on a modern machine.
On a PowerBook G4 I get a few MBit for TX and a few more for RX.
So it doesn't work as well as DMA (of course), but it's a _lot_ faster
than the old PIO code (only got a few kBit with that).
The limiting factor is the host CPU speed. So it will generate 100%
CPU usage when the network interface is heavily loaded. A voluntary preemption
point in the RX path makes sure Desktop Latency isn't hurt.
PIO is needed for 16bit PCMCIA devices, as we really don't want to poke with
the braindead DMA mechanisms on PCMCIA sockets. Additionally, not all
PCMCIA sockets do actually support DMA in 16bit mode (mine doesn't).
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/b43/dma.h')
| -rw-r--r-- | drivers/net/wireless/b43/dma.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h index ea27085dec0e..20acf885dba5 100644 --- a/drivers/net/wireless/b43/dma.h +++ b/drivers/net/wireless/b43/dma.h @@ -291,4 +291,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, void b43_dma_rx(struct b43_dmaring *ring); +void b43_dma_direct_fifo_rx(struct b43_wldev *dev, + unsigned int engine_index, bool enable); + #endif /* B43_DMA_H_ */ |