diff options
Diffstat (limited to 'target/linux/generic/patches-4.1/132-mips_inline_dma_ops.patch')
| -rw-r--r-- | target/linux/generic/patches-4.1/132-mips_inline_dma_ops.patch | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.1/132-mips_inline_dma_ops.patch b/target/linux/generic/patches-4.1/132-mips_inline_dma_ops.patch new file mode 100644 index 0000000..f7543cc --- /dev/null +++ b/target/linux/generic/patches-4.1/132-mips_inline_dma_ops.patch @@ -0,0 +1,697 @@ +From 2c58080407554e1bac8fd50d23cb02420524caed Mon Sep 17 00:00:00 2001 +From: Felix Fietkau <nbd@openwrt.org> +Date: Mon, 12 Aug 2013 12:50:22 +0200 +Subject: [PATCH] MIPS: partially inline dma ops + +Several DMA ops are no-op on many platforms, and the indirection through +the mips_dma_map_ops function table is causing the compiler to emit +unnecessary code. + +Inlining visibly improves network performance in my tests (on a 24Kc +based system), and also slightly reduces code size of a few drivers. + +Signed-off-by: Felix Fietkau <nbd@openwrt.org> +--- + arch/mips/Kconfig | 4 + + arch/mips/include/asm/dma-mapping.h | 360 +++++++++++++++++++++++++++++++++++- + arch/mips/mm/dma-default.c | 163 ++-------------- + 3 files changed, 373 insertions(+), 154 deletions(-) + +--- a/arch/mips/Kconfig ++++ b/arch/mips/Kconfig +@@ -1571,6 +1571,7 @@ config CPU_CAVIUM_OCTEON + select CPU_SUPPORTS_HUGEPAGES + select USB_EHCI_BIG_ENDIAN_MMIO + select MIPS_L1_CACHE_SHIFT_7 ++ select SYS_HAS_DMA_OPS + help + The Cavium Octeon processor is a highly integrated chip containing + many ethernet hardware widgets for networking tasks. The processor +@@ -1866,6 +1867,9 @@ config MIPS_MALTA_PM + bool + default y + ++config SYS_HAS_DMA_OPS ++ bool ++ + # + # CPU may reorder R->R, R->W, W->R, W->W + # Reordering beyond LL and SC is handled in WEAK_REORDERING_BEYOND_LLSC +--- a/arch/mips/include/asm/dma-mapping.h ++++ b/arch/mips/include/asm/dma-mapping.h +@@ -1,9 +1,16 @@ + #ifndef _ASM_DMA_MAPPING_H + #define _ASM_DMA_MAPPING_H + ++#include <linux/kmemcheck.h> ++#include <linux/bug.h> ++#include <linux/scatterlist.h> ++#include <linux/dma-debug.h> ++#include <linux/dma-attrs.h> ++ + #include <asm/scatterlist.h> + #include <asm/dma-coherence.h> + #include <asm/cache.h> ++#include <asm/cpu-type.h> + #include <asm-generic/dma-coherent.h> + + #ifndef CONFIG_SGI_IP27 /* Kludge to fix 2.6.39 build for IP27 */ +@@ -12,12 +19,48 @@ + + extern struct dma_map_ops *mips_dma_map_ops; + ++void __dma_sync(struct page *page, unsigned long offset, size_t size, ++ enum dma_data_direction direction); ++void *mips_dma_alloc_coherent(struct device *dev, size_t size, ++ dma_addr_t *dma_handle, gfp_t gfp, ++ struct dma_attrs *attrs); ++void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr, ++ dma_addr_t dma_handle, struct dma_attrs *attrs); ++ + static inline struct dma_map_ops *get_dma_ops(struct device *dev) + { ++#ifdef CONFIG_SYS_HAS_DMA_OPS + if (dev && dev->archdata.dma_ops) + return dev->archdata.dma_ops; + else + return mips_dma_map_ops; ++#else ++ return NULL; ++#endif ++} ++ ++/* ++ * Warning on the terminology - Linux calls an uncached area coherent; ++ * MIPS terminology calls memory areas with hardware maintained coherency ++ * coherent. ++ */ ++ ++static inline int cpu_needs_post_dma_flush(struct device *dev) ++{ ++#ifndef CONFIG_SYS_HAS_CPU_R10000 ++ return 0; ++#endif ++ return !plat_device_is_coherent(dev) && ++ (boot_cpu_type() == CPU_R10000 || ++ boot_cpu_type() == CPU_R12000 || ++ boot_cpu_type() == CPU_BMIPS5000); ++} ++ ++static inline struct page *dma_addr_to_page(struct device *dev, ++ dma_addr_t dma_addr) ++{ ++ return pfn_to_page( ++ plat_dma_addr_to_phys(dev, dma_addr) >> PAGE_SHIFT); + } + + static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +@@ -30,12 +73,306 @@ static inline bool dma_capable(struct de + + static inline void dma_mark_clean(void *addr, size_t size) {} + +-#include <asm-generic/dma-mapping-common.h> ++static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, ++ size_t size, ++ enum dma_data_direction dir, ++ struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ unsigned long offset = (unsigned long)ptr & ~PAGE_MASK; ++ struct page *page = virt_to_page(ptr); ++ dma_addr_t addr; ++ ++ kmemcheck_mark_initialized(ptr, size); ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) { ++ addr = ops->map_page(dev, page, offset, size, dir, attrs); ++ } else { ++ if (!plat_device_is_coherent(dev)) ++ __dma_sync(page, offset, size, dir); ++ ++ addr = plat_map_dma_mem_page(dev, page) + offset; ++ } ++ debug_dma_map_page(dev, page, offset, size, dir, addr, true); ++ return addr; ++} ++ ++static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, ++ size_t size, ++ enum dma_data_direction dir, ++ struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) { ++ ops->unmap_page(dev, addr, size, dir, attrs); ++ } else { ++ if (cpu_needs_post_dma_flush(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr), ++ addr & ~PAGE_MASK, size, dir); ++ ++ plat_unmap_dma_mem(dev, addr, size, dir); ++ } ++ debug_dma_unmap_page(dev, addr, size, dir, true); ++} ++ ++static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, ++ int nents, enum dma_data_direction dir, ++ struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ int i, ents; ++ struct scatterlist *s; ++ ++ for_each_sg(sg, s, nents, i) ++ kmemcheck_mark_initialized(sg_virt(s), s->length); ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) { ++ ents = ops->map_sg(dev, sg, nents, dir, attrs); ++ } else { ++ for_each_sg(sg, s, nents, i) { ++ struct page *page = sg_page(s); ++ ++ if (!plat_device_is_coherent(dev)) ++ __dma_sync(page, s->offset, s->length, dir); ++#ifdef CONFIG_NEED_SG_DMA_LENGTH ++ s->dma_length = s->length; ++#endif ++ s->dma_address = ++ plat_map_dma_mem_page(dev, page) + s->offset; ++ } ++ ents = nents; ++ } ++ debug_dma_map_sg(dev, sg, nents, ents, dir); ++ ++ return ents; ++} ++ ++static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, ++ int nents, enum dma_data_direction dir, ++ struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ struct scatterlist *s; ++ int i; ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ debug_dma_unmap_sg(dev, sg, nents, dir); ++ if (ops) { ++ ops->unmap_sg(dev, sg, nents, dir, attrs); ++ return; ++ } ++ ++ for_each_sg(sg, s, nents, i) { ++ if (!plat_device_is_coherent(dev) && dir != DMA_TO_DEVICE) ++ __dma_sync(sg_page(s), s->offset, s->length, dir); ++ plat_unmap_dma_mem(dev, s->dma_address, s->length, dir); ++ } ++} ++ ++static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, ++ size_t offset, size_t size, ++ enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ dma_addr_t addr; ++ ++ kmemcheck_mark_initialized(page_address(page) + offset, size); ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) { ++ addr = ops->map_page(dev, page, offset, size, dir, NULL); ++ } else { ++ if (!plat_device_is_coherent(dev)) ++ __dma_sync(page, offset, size, dir); ++ ++ addr = plat_map_dma_mem_page(dev, page) + offset; ++ } ++ debug_dma_map_page(dev, page, offset, size, dir, addr, false); ++ ++ return addr; ++} ++ ++static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, ++ size_t size, enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) { ++ ops->unmap_page(dev, addr, size, dir, NULL); ++ } else { ++ if (cpu_needs_post_dma_flush(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr), ++ addr & ~PAGE_MASK, size, dir); ++ plat_post_dma_flush(dev); ++ plat_unmap_dma_mem(dev, addr, size, dir); ++ } ++ debug_dma_unmap_page(dev, addr, size, dir, false); ++} ++ ++static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, ++ size_t size, ++ enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_single_for_cpu(dev, addr, size, dir); ++ else if (cpu_needs_post_dma_flush(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr), ++ addr & ~PAGE_MASK, size, dir); ++ plat_post_dma_flush(dev); ++ debug_dma_sync_single_for_cpu(dev, addr, size, dir); ++} ++ ++static inline void dma_sync_single_for_device(struct device *dev, ++ dma_addr_t addr, size_t size, ++ enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_single_for_device(dev, addr, size, dir); ++ else if (!plat_device_is_coherent(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr), ++ addr & ~PAGE_MASK, size, dir); ++ debug_dma_sync_single_for_device(dev, addr, size, dir); ++} ++ ++static inline void dma_sync_single_range_for_cpu(struct device *dev, ++ dma_addr_t addr, ++ unsigned long offset, ++ size_t size, ++ enum dma_data_direction dir) ++{ ++ const struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_single_for_cpu(dev, addr + offset, size, dir); ++ else if (cpu_needs_post_dma_flush(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr + offset), ++ (addr + offset) & ~PAGE_MASK, size, dir); ++ debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir); ++} ++ ++static inline void dma_sync_single_range_for_device(struct device *dev, ++ dma_addr_t addr, ++ unsigned long offset, ++ size_t size, ++ enum dma_data_direction dir) ++{ ++ const struct dma_map_ops *ops = get_dma_ops(dev); ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_single_for_device(dev, addr + offset, size, dir); ++ else if (!plat_device_is_coherent(dev)) ++ __dma_sync(dma_addr_to_page(dev, addr + offset), ++ (addr + offset) & ~PAGE_MASK, size, dir); ++ debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir); ++} ++ ++static inline void ++dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, ++ int nelems, enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ struct scatterlist *s; ++ int i; ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_sg_for_cpu(dev, sg, nelems, dir); ++ else if (cpu_needs_post_dma_flush(dev)) { ++ for_each_sg(sg, s, nelems, i) ++ __dma_sync(sg_page(s), s->offset, s->length, dir); ++ } ++ plat_post_dma_flush(dev); ++ debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir); ++} ++ ++static inline void ++dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, ++ int nelems, enum dma_data_direction dir) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ struct scatterlist *s; ++ int i; ++ ++ BUG_ON(!valid_dma_direction(dir)); ++ if (ops) ++ ops->sync_sg_for_device(dev, sg, nelems, dir); ++ else if (!plat_device_is_coherent(dev)) { ++ for_each_sg(sg, s, nelems, i) ++ __dma_sync(sg_page(s), s->offset, s->length, dir); ++ } ++ debug_dma_sync_sg_for_device(dev, sg, nelems, dir); ++ ++} ++ ++#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL) ++#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL) ++#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL) ++#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL) ++ ++extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, ++ void *cpu_addr, dma_addr_t dma_addr, size_t size); ++ ++/** ++ * dma_mmap_attrs - map a coherent DMA allocation into user space ++ * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices ++ * @vma: vm_area_struct describing requested user mapping ++ * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs ++ * @handle: device-view address returned from dma_alloc_attrs ++ * @size: size of memory originally requested in dma_alloc_attrs ++ * @attrs: attributes of mapping properties requested in dma_alloc_attrs ++ * ++ * Map a coherent DMA buffer previously allocated by dma_alloc_attrs ++ * into user space. The coherent DMA buffer must not be freed by the ++ * driver until the user space mapping has been released. ++ */ ++static inline int ++dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, ++ dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ BUG_ON(!ops); ++ if (ops && ops->mmap) ++ return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs); ++ return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); ++} ++ ++#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL) ++ ++int ++dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, ++ void *cpu_addr, dma_addr_t dma_addr, size_t size); ++ ++static inline int ++dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr, ++ dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs) ++{ ++ struct dma_map_ops *ops = get_dma_ops(dev); ++ BUG_ON(!ops); ++ if (ops && ops->get_sgtable) ++ return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, ++ attrs); ++ return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size); ++} ++ ++#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, NULL) ++ + + static inline int dma_supported(struct device *dev, u64 mask) + { + struct dma_map_ops *ops = get_dma_ops(dev); +- return ops->dma_supported(dev, mask); ++ if (ops) ++ return ops->dma_supported(dev, mask); ++ return plat_dma_supported(dev, mask); + } + + static inline int dma_mapping_error(struct device *dev, u64 mask) +@@ -43,7 +380,9 @@ static inline int dma_mapping_error(stru + struct dma_map_ops *ops = get_dma_ops(dev); + + debug_dma_mapping_error(dev, mask); +- return ops->mapping_error(dev, mask); ++ if (ops) ++ return ops->mapping_error(dev, mask); ++ return 0; + } + + static inline int +@@ -54,7 +393,7 @@ dma_set_mask(struct device *dev, u64 mas + if(!dev->dma_mask || !dma_supported(dev, mask)) + return -EIO; + +- if (ops->set_dma_mask) ++ if (ops && ops->set_dma_mask) + return ops->set_dma_mask(dev, mask); + + *dev->dma_mask = mask; +@@ -74,7 +413,11 @@ static inline void *dma_alloc_attrs(stru + void *ret; + struct dma_map_ops *ops = get_dma_ops(dev); + +- ret = ops->alloc(dev, size, dma_handle, gfp, attrs); ++ if (ops) ++ ret = ops->alloc(dev, size, dma_handle, gfp, attrs); ++ else ++ ret = mips_dma_alloc_coherent(dev, size, dma_handle, gfp, ++ attrs); + + debug_dma_alloc_coherent(dev, size, *dma_handle, ret); + +@@ -89,7 +432,10 @@ static inline void dma_free_attrs(struct + { + struct dma_map_ops *ops = get_dma_ops(dev); + +- ops->free(dev, size, vaddr, dma_handle, attrs); ++ if (ops) ++ ops->free(dev, size, vaddr, dma_handle, attrs); ++ else ++ mips_dma_free_coherent(dev, size, vaddr, dma_handle, attrs); + + debug_dma_free_coherent(dev, size, vaddr, dma_handle); + } +--- a/arch/mips/mm/dma-default.c ++++ b/arch/mips/mm/dma-default.c +@@ -26,7 +26,7 @@ + + #ifdef CONFIG_DMA_MAYBE_COHERENT + int coherentio = 0; /* User defined DMA coherency from command line. */ +-EXPORT_SYMBOL_GPL(coherentio); ++EXPORT_SYMBOL(coherentio); + int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ + + static int __init setcoherentio(char *str) +@@ -46,35 +46,6 @@ static int __init setnocoherentio(char * + early_param("nocoherentio", setnocoherentio); + #endif + +-static inline struct page *dma_addr_to_page(struct device *dev, +- dma_addr_t dma_addr) +-{ +- return pfn_to_page( +- plat_dma_addr_to_phys(dev, dma_addr) >> PAGE_SHIFT); +-} +- +-/* +- * The affected CPUs below in 'cpu_needs_post_dma_flush()' can +- * speculatively fill random cachelines with stale data at any time, +- * requiring an extra flush post-DMA. +- * +- * Warning on the terminology - Linux calls an uncached area coherent; +- * MIPS terminology calls memory areas with hardware maintained coherency +- * coherent. +- * +- * Note that the R14000 and R16000 should also be checked for in this +- * condition. However this function is only called on non-I/O-coherent +- * systems and only the R10000 and R12000 are used in such systems, the +- * SGI IP28 Indigo² rsp. SGI IP32 aka O2. +- */ +-static inline int cpu_needs_post_dma_flush(struct device *dev) +-{ +- return !plat_device_is_coherent(dev) && +- (boot_cpu_type() == CPU_R10000 || +- boot_cpu_type() == CPU_R12000 || +- boot_cpu_type() == CPU_BMIPS5000); +-} +- + static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) + { + gfp_t dma_flag; +@@ -130,8 +101,9 @@ void *dma_alloc_noncoherent(struct devic + } + EXPORT_SYMBOL(dma_alloc_noncoherent); + +-static void *mips_dma_alloc_coherent(struct device *dev, size_t size, +- dma_addr_t * dma_handle, gfp_t gfp, struct dma_attrs *attrs) ++void *mips_dma_alloc_coherent(struct device *dev, size_t size, ++ dma_addr_t *dma_handle, gfp_t gfp, ++ struct dma_attrs *attrs) + { + void *ret; + struct page *page = NULL; +@@ -162,6 +134,7 @@ static void *mips_dma_alloc_coherent(str + + return ret; + } ++EXPORT_SYMBOL(mips_dma_alloc_coherent); + + + void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, +@@ -172,8 +145,8 @@ void dma_free_noncoherent(struct device + } + EXPORT_SYMBOL(dma_free_noncoherent); + +-static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr, +- dma_addr_t dma_handle, struct dma_attrs *attrs) ++void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr, ++ dma_addr_t dma_handle, struct dma_attrs *attrs) + { + unsigned long addr = (unsigned long) vaddr; + int order = get_order(size); +@@ -193,6 +166,7 @@ static void mips_dma_free_coherent(struc + if (!dma_release_from_contiguous(dev, page, count)) + __free_pages(page, get_order(size)); + } ++EXPORT_SYMBOL(mips_dma_free_coherent); + + static inline void __dma_sync_virtual(void *addr, size_t size, + enum dma_data_direction direction) +@@ -221,8 +195,8 @@ static inline void __dma_sync_virtual(vo + * If highmem is not configured then the bulk of this loop gets + * optimized out. + */ +-static inline void __dma_sync(struct page *page, +- unsigned long offset, size_t size, enum dma_data_direction direction) ++void __dma_sync(struct page *page, unsigned long offset, size_t size, ++ enum dma_data_direction direction) + { + size_t left = size; + +@@ -251,110 +225,7 @@ static inline void __dma_sync(struct pag + left -= len; + } while (left); + } +- +-static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, +- size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) +-{ +- if (cpu_needs_post_dma_flush(dev)) +- __dma_sync(dma_addr_to_page(dev, dma_addr), +- dma_addr & ~PAGE_MASK, size, direction); +- plat_post_dma_flush(dev); +- plat_unmap_dma_mem(dev, dma_addr, size, direction); +-} +- +-static int mips_dma_map_sg(struct device *dev, struct scatterlist *sg, +- int nents, enum dma_data_direction direction, struct dma_attrs *attrs) +-{ +- int i; +- +- for (i = 0; i < nents; i++, sg++) { +- if (!plat_device_is_coherent(dev)) +- __dma_sync(sg_page(sg), sg->offset, sg->length, +- direction); +-#ifdef CONFIG_NEED_SG_DMA_LENGTH +- sg->dma_length = sg->length; +-#endif +- sg->dma_address = plat_map_dma_mem_page(dev, sg_page(sg)) + +- sg->offset; +- } +- +- return nents; +-} +- +-static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page, +- unsigned long offset, size_t size, enum dma_data_direction direction, +- struct dma_attrs *attrs) +-{ +- if (!plat_device_is_coherent(dev)) +- __dma_sync(page, offset, size, direction); +- +- return plat_map_dma_mem_page(dev, page) + offset; +-} +- +-static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sg, +- int nhwentries, enum dma_data_direction direction, +- struct dma_attrs *attrs) +-{ +- int i; +- +- for (i = 0; i < nhwentries; i++, sg++) { +- if (!plat_device_is_coherent(dev) && +- direction != DMA_TO_DEVICE) +- __dma_sync(sg_page(sg), sg->offset, sg->length, +- direction); +- plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction); +- } +-} +- +-static void mips_dma_sync_single_for_cpu(struct device *dev, +- dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) +-{ +- if (cpu_needs_post_dma_flush(dev)) +- __dma_sync(dma_addr_to_page(dev, dma_handle), +- dma_handle & ~PAGE_MASK, size, direction); +- plat_post_dma_flush(dev); +-} +- +-static void mips_dma_sync_single_for_device(struct device *dev, +- dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) +-{ +- if (!plat_device_is_coherent(dev)) +- __dma_sync(dma_addr_to_page(dev, dma_handle), +- dma_handle & ~PAGE_MASK, size, direction); +-} +- +-static void mips_dma_sync_sg_for_cpu(struct device *dev, +- struct scatterlist *sg, int nelems, enum dma_data_direction direction) +-{ +- int i; +- +- if (cpu_needs_post_dma_flush(dev)) +- for (i = 0; i < nelems; i++, sg++) +- __dma_sync(sg_page(sg), sg->offset, sg->length, +- direction); +- plat_post_dma_flush(dev); +-} +- +-static void mips_dma_sync_sg_for_device(struct device *dev, +- struct scatterlist *sg, int nelems, enum dma_data_direction direction) +-{ +- int i; +- +- if (!plat_device_is_coherent(dev)) +- for (i = 0; i < nelems; i++, sg++) +- __dma_sync(sg_page(sg), sg->offset, sg->length, +- direction); +-} +- +-int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +-{ +- return 0; +-} +- +-int mips_dma_supported(struct device *dev, u64 mask) +-{ +- return plat_dma_supported(dev, mask); +-} ++EXPORT_SYMBOL(__dma_sync); + + void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction) +@@ -367,23 +238,10 @@ void dma_cache_sync(struct device *dev, + + EXPORT_SYMBOL(dma_cache_sync); + +-static struct dma_map_ops mips_default_dma_map_ops = { +- .alloc = mips_dma_alloc_coherent, +- .free = mips_dma_free_coherent, +- .map_page = mips_dma_map_page, +- .unmap_page = mips_dma_unmap_page, +- .map_sg = mips_dma_map_sg, +- .unmap_sg = mips_dma_unmap_sg, +- .sync_single_for_cpu = mips_dma_sync_single_for_cpu, +- .sync_single_for_device = mips_dma_sync_single_for_device, +- .sync_sg_for_cpu = mips_dma_sync_sg_for_cpu, +- .sync_sg_for_device = mips_dma_sync_sg_for_device, +- .mapping_error = mips_dma_mapping_error, +- .dma_supported = mips_dma_supported +-}; +- +-struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops; ++#ifdef CONFIG_SYS_HAS_DMA_OPS ++struct dma_map_ops *mips_dma_map_ops = NULL; + EXPORT_SYMBOL(mips_dma_map_ops); ++#endif + + #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) + |