Ralf Baechle <ralf@xxxxxxxxxxxxxx> writes:
Hi,
> Here is a quick'n'dirty solution which I've not tested beyond just
> compiling. It should work but performance will be bad. Either way, I'm
> interested in a test report with X.
>
> Ralf
>
> Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
>
> diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
> index 5510c53..053e463 100644
> --- a/arch/mips/include/asm/pci.h
> +++ b/arch/mips/include/asm/pci.h
> @@ -79,6 +79,11 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
> /* We don't do dynamic PCI IRQ allocation */
> }
>
> +#define HAVE_PCI_MMAP
> +
> +extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
> + enum pci_mmap_state mmap_state, int write_combine);
> +
> /*
> * Dynamic DMA mapping stuff.
> * MIPS has everything mapped statically.
> diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
> index a377e9d..9233193 100644
> --- a/arch/mips/pci/pci.c
> +++ b/arch/mips/pci/pci.c
> @@ -354,6 +354,22 @@ EXPORT_SYMBOL(PCIBIOS_MIN_IO);
> EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
> #endif
>
> +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
> + enum pci_mmap_state mmap_state, int write_combine)
> +{
> + unsigned long prot;
> +
> + /*
> + * Ignore write-combine; for now only return uncached mappings.
> + */
> + prot = pgprot_val(vma->vm_page_prot);
> + prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
What about things like _CACHE_UNCACHED_ACCELERATED ? Is there a way to
use this flag ?
Arnaud
