diff options
Diffstat (limited to 'arch/mips/include/asm/mach-ath25/dma-coherence.h')
| -rw-r--r-- | arch/mips/include/asm/mach-ath25/dma-coherence.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/mips/include/asm/mach-ath25/dma-coherence.h b/arch/mips/include/asm/mach-ath25/dma-coherence.h index 8b3d0cca4505..d8009c93a465 100644 --- a/arch/mips/include/asm/mach-ath25/dma-coherence.h +++ b/arch/mips/include/asm/mach-ath25/dma-coherence.h @@ -12,22 +12,40 @@ #include <linux/device.h> +/* + * We need some arbitrary non-zero value to be programmed to the BAR1 register + * of PCI host controller to enable DMA. The same value should be used as the + * offset to calculate the physical address of DMA buffer for PCI devices. + */ +#define AR2315_PCI_HOST_SDRAM_BASEADDR 0x20000000 + +static inline dma_addr_t ath25_dev_offset(struct device *dev) +{ +#ifdef CONFIG_PCI + extern struct bus_type pci_bus_type; + + if (dev && dev->bus == &pci_bus_type) + return AR2315_PCI_HOST_SDRAM_BASEADDR; +#endif + return 0; +} + static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size) { - return virt_to_phys(addr); + return virt_to_phys(addr) + ath25_dev_offset(dev); } static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page) { - return page_to_phys(page); + return page_to_phys(page) + ath25_dev_offset(dev); } static inline unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr) { - return dma_addr; + return dma_addr - ath25_dev_offset(dev); } static inline void |