From 061e98a971b62ce4ee25c6cbd88b46d9870d5d9f Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Fri, 29 Feb 2008 12:55:41 +0100 Subject: [PATCH] b43: Backport bcm4311 fix This is a backport of upstream commit 013978b6 ("b43: Changes to enable BCM4311 rev 02 with wireless core revision 13") and the changes include the following: (1) Add the 802.11 rev 13 device to the ssb_device_id table to load b43. (2) Add PHY revision 9 to the supported list. (3) Change the 2-bit routing code for address extensions to 0b10 rather than the 0b01 used for the 32-bit case. (4) Remove some magic numbers in the DMA setup. The DMA implementation for this chip supports full 64-bit addressing with one exception. Whenever the Descriptor Ring Buffer is in high memory, a fatal DMA error occurs. This problem was not present in 2.6.24-rc2 due to code to "Bias the placement of kernel pages at lower PFNs". When commit 44048d70 reverted that code, the DMA error appeared. As a "fix", use the GFP_DMA flag when allocating the buffer for 64-bit DMA. At present, this problem is thought to arise from a hardware error. Signed-off-by: Michael Buesch Cc: Larry Finger Cc: John W. Linville Cc: Alexey Zaytsev Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/b43/dma.c | 32 +++++++++++++++++++++++--------- drivers/net/wireless/b43/main.c | 3 ++- 2 files changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c index 559a9a961f04..ddcc0c49a7df 100644 --- a/drivers/net/wireless/b43/dma.c +++ b/drivers/net/wireless/b43/dma.c @@ -165,7 +165,7 @@ static void op64_fill_descriptor(struct b43_dmaring *ring, addrhi = (((u64) dmaaddr >> 32) & ~SSB_DMA_TRANSLATION_MASK); addrext = (((u64) dmaaddr >> 32) & SSB_DMA_TRANSLATION_MASK) >> SSB_DMA_TRANSLATION_SHIFT; - addrhi |= ssb_dma_translation(ring->dev->dev); + addrhi |= (ssb_dma_translation(ring->dev->dev) << 1); if (slot == ring->nr_slots - 1) ctl0 |= B43_DMA64_DCTL0_DTABLEEND; if (start) @@ -426,9 +426,21 @@ static inline static int alloc_ringmemory(struct b43_dmaring *ring) { struct device *dev = ring->dev->dev->dev; - + gfp_t flags = GFP_KERNEL; + + /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K + * alignment and 8K buffers for 64-bit DMA with 8K alignment. Testing + * has shown that 4K is sufficient for the latter as long as the buffer + * does not cross an 8K boundary. + * + * For unknown reasons - possibly a hardware error - the BCM4311 rev + * 02, which uses 64-bit DMA, needs the ring buffer in very low memory, + * which accounts for the GFP_DMA flag below. + */ + if (ring->dma64) + flags |= GFP_DMA; ring->descbase = dma_alloc_coherent(dev, B43_DMA_RINGMEMSIZE, - &(ring->dmabase), GFP_KERNEL); + &(ring->dmabase), flags); if (!ring->descbase) { b43err(ring->dev->wl, "DMA ringmemory allocation failed\n"); return -ENOMEM; @@ -483,7 +495,7 @@ int b43_dmacontroller_rx_reset(struct b43_wldev *dev, u16 mmio_base, int dma64) return 0; } -/* Reset the RX DMA channel */ +/* Reset the TX DMA channel */ int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base, int dma64) { int i; @@ -647,7 +659,7 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA64_TXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) - | trans); + | (trans << 1)); } else { u32 ringbase = (u32) (ring->dmabase); @@ -680,8 +692,9 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA64_RXRINGHI, ((ringbase >> 32) & ~SSB_DMA_TRANSLATION_MASK) - | trans); - b43_dma_write(ring, B43_DMA64_RXINDEX, 200); + | (trans << 1)); + b43_dma_write(ring, B43_DMA64_RXINDEX, ring->nr_slots * + sizeof(struct b43_dmadesc64)); } else { u32 ringbase = (u32) (ring->dmabase); @@ -695,11 +708,12 @@ static int dmacontroller_setup(struct b43_dmaring *ring) b43_dma_write(ring, B43_DMA32_RXRING, (ringbase & ~SSB_DMA_TRANSLATION_MASK) | trans); - b43_dma_write(ring, B43_DMA32_RXINDEX, 200); + b43_dma_write(ring, B43_DMA32_RXINDEX, ring->nr_slots * + sizeof(struct b43_dmadesc32)); } } - out: +out: return err; } diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c index 69795fd84789..36a1de20478d 100644 --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -101,6 +101,7 @@ static const struct ssb_device_id b43_ssb_tbl[] = { SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 7), SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 9), SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 10), + SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 13), SSB_DEVTABLE_END }; @@ -3079,7 +3080,7 @@ static int b43_phy_versioning(struct b43_wldev *dev) unsupported = 1; break; case B43_PHYTYPE_G: - if (phy_rev > 8) + if (phy_rev > 9) unsupported = 1; break; default: -- 2.39.5