b43: Remove PIO support

Remove b43 PIO support.
DMA works well on all supported devices. There's no reason to use PIO.
Additionally, new devices don't support PIO in hardware anymore.
b43 PIO support is dead and unused code.

After applying this patch please do
git rm drivers/net/wireless/b43/pio.h
git rm drivers/net/wireless/b43/pio.c
to remove the main PIO support code.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 14 deletions

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index f3552acffdf7..63217b1e312d 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -915,11 +915,7 @@ static void b43_destroy_dmaring(struct b43_dmaring *ring)
 
 void b43_dma_free(struct b43_wldev *dev)
 {
-        struct b43_dma *dma;
-
-        if (b43_using_pio(dev))
-                return;
-        dma = &dev->dma;
+        struct b43_dma *dma = &dev->dma;
 
         b43_destroy_dmaring(dma->rx_ring3);
         dma->rx_ring3 = NULL;
@@ -954,16 +950,11 @@ int b43_dma_init(struct b43_wldev *dev)
 
         err = ssb_dma_set_mask(dev->dev, dmamask);
         if (err) {
-#ifdef B43_PIO
-                b43warn(dev->wl, "DMA for this device not supported. "
-                        "Falling back to PIO\n");
-                dev->__using_pio = 1;
-                return -EAGAIN;
-#else
-                b43err(dev->wl, "DMA for this device not supported and "
-                       "no PIO support compiled in\n");
+                b43err(dev->wl, "The machine/kernel does not support "
+                       "the required DMA mask (0x%08X%08X)\n",
+                       (unsigned int)((dmamask & 0xFFFFFFFF00000000ULL) >> 32),
+                       (unsigned int)(dmamask & 0x00000000FFFFFFFFULL));
                 return -EOPNOTSUPP;
-#endif
         }
 
         err = -ENOMEM;