diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/dma-mapping.h | 5 | ||||
| -rw-r--r-- | arch/mips/include/asm/mach-loongson/dma-coherence.h | 22 | ||||
| -rw-r--r-- | arch/mips/loongson/common/Makefile | 5 | ||||
| -rw-r--r-- | arch/mips/loongson/common/dma-swiotlb.c | 136 |
4 files changed, 167 insertions, 1 deletions
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h index 84238c574d5..06412aa9e3f 100644 --- a/arch/mips/include/asm/dma-mapping.h +++ b/arch/mips/include/asm/dma-mapping.h @@ -49,9 +49,14 @@ static inline int dma_mapping_error(struct device *dev, u64 mask) static inline int dma_set_mask(struct device *dev, u64 mask) { + struct dma_map_ops *ops = get_dma_ops(dev); + if(!dev->dma_mask || !dma_supported(dev, mask)) return -EIO; + if (ops->set_dma_mask) + return ops->set_dma_mask(dev, mask); + *dev->dma_mask = mask; return 0; diff --git a/arch/mips/include/asm/mach-loongson/dma-coherence.h b/arch/mips/include/asm/mach-loongson/dma-coherence.h index aeb2c05d614..6a902751cc7 100644 --- a/arch/mips/include/asm/mach-loongson/dma-coherence.h +++ b/arch/mips/include/asm/mach-loongson/dma-coherence.h @@ -11,24 +11,40 @@ #ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H #define __ASM_MACH_LOONGSON_DMA_COHERENCE_H +#ifdef CONFIG_SWIOTLB +#include <linux/swiotlb.h> +#endif + struct device; +extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr); +extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr); static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size) { +#ifdef CONFIG_CPU_LOONGSON3 + return virt_to_phys(addr); +#else return virt_to_phys(addr) | 0x80000000; +#endif } static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page) { +#ifdef CONFIG_CPU_LOONGSON3 + return page_to_phys(page); +#else return page_to_phys(page) | 0x80000000; +#endif } static inline unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr) { -#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT) +#if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT) + return dma_addr; +#elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT) return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff); #else return dma_addr & 0x7fffffff; @@ -55,7 +71,11 @@ static inline int plat_dma_supported(struct device *dev, u64 mask) static inline int plat_device_is_coherent(struct device *dev) { +#ifdef CONFIG_DMA_NONCOHERENT return 0; +#else + return 1; +#endif /* CONFIG_DMA_NONCOHERENT */ } #endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */ diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile index 9e4484ccbb0..0bb9cc9dc62 100644 --- a/arch/mips/loongson/common/Makefile +++ b/arch/mips/loongson/common/Makefile @@ -26,3 +26,8 @@ obj-$(CONFIG_CS5536) += cs5536/ # obj-$(CONFIG_LOONGSON_SUSPEND) += pm.o + +# +# Big Memory (SWIOTLB) Support +# +obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o diff --git a/arch/mips/loongson/common/dma-swiotlb.c b/arch/mips/loongson/common/dma-swiotlb.c new file mode 100644 index 00000000000..c2be01f9157 --- /dev/null +++ b/arch/mips/loongson/common/dma-swiotlb.c @@ -0,0 +1,136 @@ +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/dma-mapping.h> +#include <linux/scatterlist.h> +#include <linux/swiotlb.h> +#include <linux/bootmem.h> + +#include <asm/bootinfo.h> +#include <boot_param.h> +#include <dma-coherence.h> + +static void *loongson_dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs) +{ + void *ret; + + if (dma_alloc_from_coherent(dev, size, dma_handle, &ret)) + return ret; + + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); + +#ifdef CONFIG_ISA + if (dev == NULL) + gfp |= __GFP_DMA; + else +#endif +#ifdef CONFIG_ZONE_DMA + if (dev->coherent_dma_mask < DMA_BIT_MASK(32)) + gfp |= __GFP_DMA; + else +#endif +#ifdef CONFIG_ZONE_DMA32 + if (dev->coherent_dma_mask < DMA_BIT_MASK(40)) + gfp |= __GFP_DMA32; + else +#endif + ; + gfp |= __GFP_NORETRY; + + ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp); + mb(); + return ret; +} + +static void loongson_dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs) +{ + int order = get_order(size); + + if (dma_release_from_coherent(dev, order, vaddr)) + return; + + swiotlb_free_coherent(dev, size, vaddr, dma_handle); +} + +static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size, + dir, attrs); + mb(); + return daddr; +} + +static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL); + mb(); + + return r; +} + +static void loongson_dma_sync_single_for_device(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction dir) +{ + swiotlb_sync_single_for_device(dev, dma_handle, size, dir); + mb(); +} + +static void loongson_dma_sync_sg_for_device(struct device *dev, + struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + swiotlb_sync_sg_for_device(dev, sg, nents, dir); + mb(); +} + +static int loongson_dma_set_mask(struct device *dev, u64 mask) +{ + if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) { + *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits); + return -EIO; + } + + *dev->dma_mask = mask; + + return 0; +} + +dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + return paddr; +} + +phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) +{ + return daddr; +} + +static struct dma_map_ops loongson_dma_map_ops = { + .alloc = loongson_dma_alloc_coherent, + .free = loongson_dma_free_coherent, + .map_page = loongson_dma_map_page, + .unmap_page = swiotlb_unmap_page, + .map_sg = loongson_dma_map_sg, + .unmap_sg = swiotlb_unmap_sg_attrs, + .sync_single_for_cpu = swiotlb_sync_single_for_cpu, + .sync_single_for_device = loongson_dma_sync_single_for_device, + .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, + .sync_sg_for_device = loongson_dma_sync_sg_for_device, + .mapping_error = swiotlb_dma_mapping_error, + .dma_supported = swiotlb_dma_supported, + .set_dma_mask = loongson_dma_set_mask +}; + +void __init plat_swiotlb_setup(void) +{ + swiotlb_init(1); + mips_dma_map_ops = &loongson_dma_map_ops; +} |