From 7c05d7e08d907d66b8e18515572f42c71fb709fe Mon Sep 17 00:00:00 2001 From: Becky Bruce Date: Mon, 8 Sep 2008 09:09:52 +0000 Subject: powerpc: Rename dma_64.c to dma.c This is in preparation for the merge of the 32 and 64-bit dma code in arch/powerpc. Signed-off-by: Becky Bruce Signed-off-by: Kumar Gala --- arch/powerpc/kernel/Makefile | 2 +- arch/powerpc/kernel/dma.c | 200 +++++++++++++++++++++++++++++++++++++++++++ arch/powerpc/kernel/dma_64.c | 200 ------------------------------------------- 3 files changed, 201 insertions(+), 201 deletions(-) create mode 100644 arch/powerpc/kernel/dma.c delete mode 100644 arch/powerpc/kernel/dma_64.c diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 16326fd..ab7d4cb 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -73,7 +73,7 @@ obj-y += time.o prom.o traps.o setup-common.o \ udbg.o misc.o io.o \ misc_$(CONFIG_WORD_SIZE).o obj-$(CONFIG_PPC32) += entry_32.o setup_32.o -obj-$(CONFIG_PPC64) += dma_64.o iommu.o +obj-$(CONFIG_PPC64) += dma.o iommu.o obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o obj-$(CONFIG_MODULES) += ppc_ksyms.o diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c new file mode 100644 index 0000000..ae5708e --- /dev/null +++ b/arch/powerpc/kernel/dma.c @@ -0,0 +1,200 @@ +/* + * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation + * + * Provide default implementations of the DMA mapping callbacks for + * directly mapped busses and busses using the iommu infrastructure + */ + +#include +#include +#include +#include +#include + +/* + * Generic iommu implementation + */ + +/* Allocates a contiguous real buffer and creates mappings over it. + * Returns the virtual address of the buffer and sets dma_handle + * to the dma address (mapping) of the first page. + */ +static void *dma_iommu_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag) +{ + return iommu_alloc_coherent(dev, dev->archdata.dma_data, size, + dma_handle, device_to_mask(dev), flag, + dev->archdata.numa_node); +} + +static void dma_iommu_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle); +} + +/* Creates TCEs for a user provided buffer. The user buffer must be + * contiguous real kernel storage (not vmalloc). The address of the buffer + * passed here is the kernel (virtual) address of the buffer. The buffer + * need not be page aligned, the dma_addr_t returned will point to the same + * byte within the page as vaddr. + */ +static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr, + size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size, + device_to_mask(dev), direction, attrs); +} + + +static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle, + size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction, + attrs); +} + + +static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems, + device_to_mask(dev), direction, attrs); +} + +static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction, + attrs); +} + +/* We support DMA to/from any memory page via the iommu */ +static int dma_iommu_dma_supported(struct device *dev, u64 mask) +{ + struct iommu_table *tbl = dev->archdata.dma_data; + + if (!tbl || tbl->it_offset > mask) { + printk(KERN_INFO + "Warning: IOMMU offset too big for device mask\n"); + if (tbl) + printk(KERN_INFO + "mask: 0x%08lx, table offset: 0x%08lx\n", + mask, tbl->it_offset); + else + printk(KERN_INFO "mask: 0x%08lx, table unavailable\n", + mask); + return 0; + } else + return 1; +} + +struct dma_mapping_ops dma_iommu_ops = { + .alloc_coherent = dma_iommu_alloc_coherent, + .free_coherent = dma_iommu_free_coherent, + .map_single = dma_iommu_map_single, + .unmap_single = dma_iommu_unmap_single, + .map_sg = dma_iommu_map_sg, + .unmap_sg = dma_iommu_unmap_sg, + .dma_supported = dma_iommu_dma_supported, +}; +EXPORT_SYMBOL(dma_iommu_ops); + +/* + * Generic direct DMA implementation + * + * This implementation supports a per-device offset that can be applied if + * the address at which memory is visible to devices is not 0. Platform code + * can set archdata.dma_data to an unsigned long holding the offset. By + * default the offset is zero. + */ + +static unsigned long get_dma_direct_offset(struct device *dev) +{ + return (unsigned long)dev->archdata.dma_data; +} + +static void *dma_direct_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t flag) +{ + struct page *page; + void *ret; + int node = dev->archdata.numa_node; + + page = alloc_pages_node(node, flag, get_order(size)); + if (page == NULL) + return NULL; + ret = page_address(page); + memset(ret, 0, size); + *dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev); + + return ret; +} + +static void dma_direct_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + free_pages((unsigned long)vaddr, get_order(size)); +} + +static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr, + size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + return virt_to_abs(ptr) + get_dma_direct_offset(dev); +} + +static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr, + size_t size, + enum dma_data_direction direction, + struct dma_attrs *attrs) +{ +} + +static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + struct scatterlist *sg; + int i; + + for_each_sg(sgl, sg, nents, i) { + sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev); + sg->dma_length = sg->length; + } + + return nents; +} + +static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ +} + +static int dma_direct_dma_supported(struct device *dev, u64 mask) +{ + /* Could be improved to check for memory though it better be + * done via some global so platforms can set the limit in case + * they have limited DMA windows + */ + return mask >= DMA_32BIT_MASK; +} + +struct dma_mapping_ops dma_direct_ops = { + .alloc_coherent = dma_direct_alloc_coherent, + .free_coherent = dma_direct_free_coherent, + .map_single = dma_direct_map_single, + .unmap_single = dma_direct_unmap_single, + .map_sg = dma_direct_map_sg, + .unmap_sg = dma_direct_unmap_sg, + .dma_supported = dma_direct_dma_supported, +}; +EXPORT_SYMBOL(dma_direct_ops); diff --git a/arch/powerpc/kernel/dma_64.c b/arch/powerpc/kernel/dma_64.c deleted file mode 100644 index ae5708e..0000000 --- a/arch/powerpc/kernel/dma_64.c +++ /dev/null @@ -1,200 +0,0 @@ -/* - * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation - * - * Provide default implementations of the DMA mapping callbacks for - * directly mapped busses and busses using the iommu infrastructure - */ - -#include -#include -#include -#include -#include - -/* - * Generic iommu implementation - */ - -/* Allocates a contiguous real buffer and creates mappings over it. - * Returns the virtual address of the buffer and sets dma_handle - * to the dma address (mapping) of the first page. - */ -static void *dma_iommu_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - return iommu_alloc_coherent(dev, dev->archdata.dma_data, size, - dma_handle, device_to_mask(dev), flag, - dev->archdata.numa_node); -} - -static void dma_iommu_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle) -{ - iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle); -} - -/* Creates TCEs for a user provided buffer. The user buffer must be - * contiguous real kernel storage (not vmalloc). The address of the buffer - * passed here is the kernel (virtual) address of the buffer. The buffer - * need not be page aligned, the dma_addr_t returned will point to the same - * byte within the page as vaddr. - */ -static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size, - device_to_mask(dev), direction, attrs); -} - - -static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction, - attrs); -} - - -static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, - int nelems, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems, - device_to_mask(dev), direction, attrs); -} - -static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist, - int nelems, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction, - attrs); -} - -/* We support DMA to/from any memory page via the iommu */ -static int dma_iommu_dma_supported(struct device *dev, u64 mask) -{ - struct iommu_table *tbl = dev->archdata.dma_data; - - if (!tbl || tbl->it_offset > mask) { - printk(KERN_INFO - "Warning: IOMMU offset too big for device mask\n"); - if (tbl) - printk(KERN_INFO - "mask: 0x%08lx, table offset: 0x%08lx\n", - mask, tbl->it_offset); - else - printk(KERN_INFO "mask: 0x%08lx, table unavailable\n", - mask); - return 0; - } else - return 1; -} - -struct dma_mapping_ops dma_iommu_ops = { - .alloc_coherent = dma_iommu_alloc_coherent, - .free_coherent = dma_iommu_free_coherent, - .map_single = dma_iommu_map_single, - .unmap_single = dma_iommu_unmap_single, - .map_sg = dma_iommu_map_sg, - .unmap_sg = dma_iommu_unmap_sg, - .dma_supported = dma_iommu_dma_supported, -}; -EXPORT_SYMBOL(dma_iommu_ops); - -/* - * Generic direct DMA implementation - * - * This implementation supports a per-device offset that can be applied if - * the address at which memory is visible to devices is not 0. Platform code - * can set archdata.dma_data to an unsigned long holding the offset. By - * default the offset is zero. - */ - -static unsigned long get_dma_direct_offset(struct device *dev) -{ - return (unsigned long)dev->archdata.dma_data; -} - -static void *dma_direct_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - struct page *page; - void *ret; - int node = dev->archdata.numa_node; - - page = alloc_pages_node(node, flag, get_order(size)); - if (page == NULL) - return NULL; - ret = page_address(page); - memset(ret, 0, size); - *dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev); - - return ret; -} - -static void dma_direct_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle) -{ - free_pages((unsigned long)vaddr, get_order(size)); -} - -static dma_addr_t dma_direct_map_single(struct device *dev, void *ptr, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - return virt_to_abs(ptr) + get_dma_direct_offset(dev); -} - -static void dma_direct_unmap_single(struct device *dev, dma_addr_t dma_addr, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ -} - -static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nents, i) { - sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev); - sg->dma_length = sg->length; - } - - return nents; -} - -static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ -} - -static int dma_direct_dma_supported(struct device *dev, u64 mask) -{ - /* Could be improved to check for memory though it better be - * done via some global so platforms can set the limit in case - * they have limited DMA windows - */ - return mask >= DMA_32BIT_MASK; -} - -struct dma_mapping_ops dma_direct_ops = { - .alloc_coherent = dma_direct_alloc_coherent, - .free_coherent = dma_direct_free_coherent, - .map_single = dma_direct_map_single, - .unmap_single = dma_direct_unmap_single, - .map_sg = dma_direct_map_sg, - .unmap_sg = dma_direct_unmap_sg, - .dma_supported = dma_direct_dma_supported, -}; -EXPORT_SYMBOL(dma_direct_ops); -- cgit v1.1