package/broadcom-wl/patches/006-generic-dma-api.patch

   1 From: George Kashperko <george@znau.edu.ua>
   2
   3 broadcom-wl driver bound to ssb device with ssb driver probe
   4 have osh handle struct pdev pointer value initialized with
   5 ssb_device pointer. Later on pdev is used with legacy pci
   6 dma api as pci_dev thus causing oops sometimes.
   7
   8 The patch replaces legacy pci dma api and pass relevant
   9 device struct pointer to avoid crashes.
  10 Signed-off-by: George Kashperko <george@znau.edu.ua>
  11 ---
  12  driver/linux_osl.c |   28 +++++++++++++++++++++++-----
  13  1 file changed, 23 insertions(+), 5 deletions(-)
  14 --- a/driver/linux_osl.c
  15 +++ b/driver/linux_osl.c
  16 @@ -25,6 +25,9 @@
  17  #include <asm/paccess.h>
  18  #endif /* mips */
  19  #include <pcicfg.h>
  20 +#ifdef CONFIG_SSB
  21 +#include <linux/ssb/ssb.h>
  22 +#endif
  23
  24  #define PCI_CFG_RETRY          10
  25
  26 @@ -364,12 +367,27 @@ osl_dma_consistent_align(void)
  27         return (PAGE_SIZE);
  28  }
  29
  30 +static struct device *
  31 +osl_get_dmadev(osl_t *osh)
  32 +{
  33 +#ifdef CONFIG_SSB
  34 +       if (osh->bustype == SI_BUS) {
  35 +               /* This can be SiliconBackplane emulated as pci with Broadcom or
  36 +                * ssb device. Less harmful is to check for pci_bus_type and if
  37 +                * no match then assume we got ssb */
  38 +               if (((struct pci_dev *)osh->pdev)->dev.bus != &pci_bus_type)
  39 +                       return ((struct ssb_device *)osh->pdev)->dma_dev;
  40 +       }
  41 +#endif
  42 +       return &((struct pci_dev *)osh->pdev)->dev;
  43 +}
  44 +
  45  void*
  46  osl_dma_alloc_consistent(osl_t *osh, uint size, ulong *pap)
  47  {
  48         ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
  49
  50 -       return (pci_alloc_consistent(osh->pdev, size, (dma_addr_t*)pap));
  51 +       return (dma_alloc_coherent(osl_get_dmadev(osh), size, (dma_addr_t*)pap, GFP_ATOMIC));
  52  }
  53
  54  void
  55 @@ -377,7 +395,7 @@ osl_dma_free_consistent(osl_t *osh, void
  56  {
  57         ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
  58
  59 -       pci_free_consistent(osh->pdev, size, va, (dma_addr_t)pa);
  60 +       dma_free_coherent(osl_get_dmadev(osh), size, va, (dma_addr_t)pa);
  61  }
  62
  63  uint BCMFASTPATH
  64 @@ -386,13 +404,13 @@ osl_dma_map(osl_t *osh, void *va, uint s
  65         ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
  66
  67         if (direction == DMA_TX)
  68 -               return (pci_map_single(osh->pdev, va, size, PCI_DMA_TODEVICE));
  69 +               return (dma_map_single(osl_get_dmadev(osh), va, size, PCI_DMA_TODEVICE));
  70         else {
  71  #ifdef mips
  72                 dma_cache_inv((uint)va, size);
  73                 return (virt_to_phys(va));
  74  #else /* mips */
  75 -               return (pci_map_single(osh->pdev, va, size, PCI_DMA_FROMDEVICE));
  76 +               return (dma_map_single(osl_get_dmadev(osh), va, size, PCI_DMA_FROMDEVICE));
  77  #endif /* mips */
  78         }
  79  }
  80 @@ -404,7 +422,7 @@ osl_dma_unmap(osl_t *osh, uint pa, uint
  81
  82         ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
  83         dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;
  84 -       pci_unmap_single(osh->pdev, (uint32)pa, size, dir);
  85 +       dma_unmap_single(osl_get_dmadev(osh), (uint32)pa, size, dir);
  86  }
  87
  88