On 2011-02-24 3:29 PM, Felix Fietkau wrote:
> On 2011-02-24 12:46 PM, Wojciech Dubowik wrote:
>>> On 2011-02-23 4:48 PM, Wojciech Dubowik wrote:
>>> > Signed-off-by: Wojciech Dubowik <wojciech.dubo...@neratec.com>
>>> Please make this dynamic. On the Fonera 2.0, PCI is used for USB 2.0
>>> support and AHB is used for wireless.
>>>
>>> - Felix
>> Hello Felix,
>>
>> Will this do the trick for dma mapping?
>>
>> --- a/arch/mips/include/asm/mach-ar231x/dma-coherence.h
>> +++ b/arch/mips/include/asm/mach-ar231x/dma-coherence.h
>> @@ -12,16 +12,23 @@
>>
>> #define PCI_DMA_OFFSET 0x20000000
>>
>> +extern struct bus_type pci_bus_type;
>> struct device;
>>
>> static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t
>> size)
>> {
>> - return virt_to_phys(addr) + (dev != NULL ? PCI_DMA_OFFSET : 0);
>> + if (dev == NULL)
>> + return virt_to_phys(addr);
>> + else
>> + return virt_to_phys(addr) + (dev->bus == &pci_bus_type ?
>> PCI_DMA_OFFSET : 0);
>> }
>>
>> static dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page
>> *page)
>> {
>> - return page_to_phys(page) + (dev != NULL ? PCI_DMA_OFFSET : 0);
>> + if (dev == NULL)
>> + return page_to_phys(page);
>> + else
>> + return page_to_phys(page) + (dev->bus == &pci_bus_type ?
>> PCI_DMA_OFFSET : 0);
>> }
>>
>> static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
>>
>> I have tested it on my AR2315 with pci bus enabled. I don't have anything
>> attached to it
>> so I cannot say that pci dma really works.
> I think this will work.
Oh, I forgot one thing. This stuff needs an #ifdef CONFIG_PCI, otherwise
it'll emit undefined references to pci_bus_type if PCI support is disabled.
By the way, instead of checking for pci_bus_type directly, you can also
include linux/pci.h and use the dev_is_pci() macro.
- Felix
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