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 | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-ath25/dma-coherence.h b/arch/mips/include/asm/mach-ath25/dma-coherence.h new file mode 100644 index 000000000000..d8009c93a465 --- /dev/null +++ b/arch/mips/include/asm/mach-ath25/dma-coherence.h @@ -0,0 +1,82 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org> + * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> + * + */ +#ifndef __ASM_MACH_ATH25_DMA_COHERENCE_H +#define __ASM_MACH_ATH25_DMA_COHERENCE_H + +#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) + 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) + ath25_dev_offset(dev); +} + +static inline unsigned long +plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr) +{ + return dma_addr - ath25_dev_offset(dev); +} + +static inline void +plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, size_t size, + enum dma_data_direction direction) +{ +} + +static inline int plat_dma_supported(struct device *dev, u64 mask) +{ + return 1; +} + +static inline void plat_extra_sync_for_device(struct device *dev) +{ +} + +static inline int plat_dma_mapping_error(struct device *dev, + dma_addr_t dma_addr) +{ + return 0; +} + +static inline int plat_device_is_coherent(struct device *dev) +{ +#ifdef CONFIG_DMA_COHERENT + return 1; +#endif +#ifdef CONFIG_DMA_NONCOHERENT + return 0; +#endif +} + +#endif /* __ASM_MACH_ATH25_DMA_COHERENCE_H */ |