diff options
Diffstat (limited to 'arch/avr32')
| -rw-r--r-- | arch/avr32/Kconfig | 1 | ||||
| -rw-r--r-- | arch/avr32/include/asm/dma-mapping.h | 342 | ||||
| -rw-r--r-- | arch/avr32/mm/dma-coherent.c | 115 |
3 files changed, 85 insertions, 373 deletions
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig index b6878eb64884..aac3d6972c30 100644 --- a/arch/avr32/Kconfig +++ b/arch/avr32/Kconfig @@ -7,6 +7,7 @@ config AVR32 select HAVE_OPROFILE select HAVE_KPROBES select VIRT_TO_BUS + select HAVE_DMA_ATTRS select GENERIC_IRQ_PROBE select GENERIC_ATOMIC64 select HARDIRQS_SW_RESEND diff --git a/arch/avr32/include/asm/dma-mapping.h b/arch/avr32/include/asm/dma-mapping.h index ae7ac9205d20..0239ca84eb41 100644 --- a/arch/avr32/include/asm/dma-mapping.h +++ b/arch/avr32/include/asm/dma-mapping.h @@ -1,350 +1,16 @@ #ifndef __ASM_AVR32_DMA_MAPPING_H #define __ASM_AVR32_DMA_MAPPING_H -#include <linux/mm.h> -#include <linux/device.h> -#include <linux/scatterlist.h> -#include <asm/processor.h> -#include <asm/cacheflush.h> -#include <asm/io.h> - extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, int direction); -/* - * Return whether the given device DMA address mask can be supported - * properly. For example, if your device can only drive the low 24-bits - * during bus mastering, then you would pass 0x00ffffff as the mask - * to this function. - */ -static inline int dma_supported(struct device *dev, u64 mask) -{ - /* Fix when needed. I really don't know of any limitations */ - return 1; -} - -static inline int dma_set_mask(struct device *dev, u64 dma_mask) -{ - if (!dev->dma_mask || !dma_supported(dev, dma_mask)) - return -EIO; - - *dev->dma_mask = dma_mask; - return 0; -} - -/* - * dma_map_single can't fail as it is implemented now. - */ -static inline int dma_mapping_error(struct device *dev, dma_addr_t addr) -{ - return 0; -} - -/** - * dma_alloc_coherent - allocate consistent memory for DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @size: required memory size - * @handle: bus-specific DMA address - * - * Allocate some uncached, unbuffered memory for a device for - * performing DMA. This function allocates pages, and will - * return the CPU-viewed address, and sets @handle to be the - * device-viewed address. - */ -extern void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *handle, gfp_t gfp); - -/** - * dma_free_coherent - free memory allocated by dma_alloc_coherent - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @size: size of memory originally requested in dma_alloc_coherent - * @cpu_addr: CPU-view address returned from dma_alloc_coherent - * @handle: device-view address returned from dma_alloc_coherent - * - * Free (and unmap) a DMA buffer previously allocated by - * dma_alloc_coherent(). - * - * References to memory and mappings associated with cpu_addr/handle - * during and after this call executing are illegal. - */ -extern void dma_free_coherent(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t handle); - -/** - * dma_alloc_writecombine - allocate write-combining memory for DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @size: required memory size - * @handle: bus-specific DMA address - * - * Allocate some uncached, buffered memory for a device for - * performing DMA. This function allocates pages, and will - * return the CPU-viewed address, and sets @handle to be the - * device-viewed address. - */ -extern void *dma_alloc_writecombine(struct device *dev, size_t size, - dma_addr_t *handle, gfp_t gfp); - -/** - * dma_free_coherent - free memory allocated by dma_alloc_writecombine - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @size: size of memory originally requested in dma_alloc_writecombine - * @cpu_addr: CPU-view address returned from dma_alloc_writecombine - * @handle: device-view address returned from dma_alloc_writecombine - * - * Free (and unmap) a DMA buffer previously allocated by - * dma_alloc_writecombine(). - * - * References to memory and mappings associated with cpu_addr/handle - * during and after this call executing are illegal. - */ -extern void dma_free_writecombine(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t handle); - -/** - * dma_map_single - map a single buffer for streaming DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @cpu_addr: CPU direct mapped address of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * - * Ensure that any data held in the cache is appropriately discarded - * or written back. - * - * The device owns this memory once this call has completed. The CPU - * can regain ownership by calling dma_unmap_single() or dma_sync_single(). - */ -static inline dma_addr_t -dma_map_single(struct device *dev, void *cpu_addr, size_t size, - enum dma_data_direction direction) -{ - dma_cache_sync(dev, cpu_addr, size, direction); - return virt_to_bus(cpu_addr); -} - -/** - * dma_unmap_single - unmap a single buffer previously mapped - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @handle: DMA address of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * - * Unmap a single streaming mode DMA translation. The handle and size - * must match what was provided in the previous dma_map_single() call. - * All other usages are undefined. - * - * After this call, reads by the CPU to the buffer are guaranteed to see - * whatever the device wrote there. - */ -static inline void -dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, - enum dma_data_direction direction) -{ - -} - -/** - * dma_map_page - map a portion of a page for streaming DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @page: page that buffer resides in - * @offset: offset into page for start of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * - * Ensure that any data held in the cache is appropriately discarded - * or written back. - * - * The device owns this memory once this call has completed. The CPU - * can regain ownership by calling dma_unmap_page() or dma_sync_single(). - */ -static inline dma_addr_t -dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction direction) -{ - return dma_map_single(dev, page_address(page) + offset, - size, direction); -} - -/** - * dma_unmap_page - unmap a buffer previously mapped through dma_map_page() - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @handle: DMA address of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * - * Unmap a single streaming mode DMA translation. The handle and size - * must match what was provided in the previous dma_map_single() call. - * All other usages are undefined. - * - * After this call, reads by the CPU to the buffer are guaranteed to see - * whatever the device wrote there. - */ -static inline void -dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, - enum dma_data_direction direction) -{ - dma_unmap_single(dev, dma_address, size, direction); -} - -/** - * dma_map_sg - map a set of SG buffers for streaming mode DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @sg: list of buffers - * @nents: number of buffers to map - * @dir: DMA transfer direction - * - * Map a set of buffers described by scatterlist in streaming - * mode for DMA. This is the scatter-gather version of the - * above pci_map_single interface. Here the scatter gather list - * elements are each tagged with the appropriate dma address - * and length. They are obtained via sg_dma_{address,length}(SG). - * - * NOTE: An implementation may be able to use a smaller number of - * DMA address/length pairs than there are SG table elements. - * (for example via virtual mapping capabilities) - * The routine returns the number of addr/length pairs actually - * used, at most nents. - * - * Device ownership issues as mentioned above for pci_map_single are - * the same here. - */ -static inline int -dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nents, i) { - char *virt; - - sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset; - virt = sg_virt(sg); - dma_cache_sync(dev, virt, sg->length, direction); - } - - return nents; -} - -/** - * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @sg: list of buffers - * @nents: number of buffers to map - * @dir: DMA transfer direction - * - * Unmap a set of streaming mode DMA translations. - * Again, CPU read rules concerning calls here are the same as for - * pci_unmap_single() above. - */ -static inline void -dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, - enum dma_data_direction direction) -{ - -} - -/** - * dma_sync_single_for_cpu - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @handle: DMA address of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * - * Make physical memory consistent for a single streaming mode DMA - * translation after a transfer. - * - * If you perform a dma_map_single() but wish to interrogate the - * buffer using the cpu, yet do not wish to teardown the DMA mapping, - * you must call this function before doing so. At the next point you - * give the DMA address back to the card, you must first perform a - * dma_sync_single_for_device, and then the device again owns the - * buffer. - */ -static inline void -dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction) -{ - /* - * No need to do anything since the CPU isn't supposed to - * touch this memory after we flushed it at mapping- or - * sync-for-device time. - */ -} - -static inline void -dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction) -{ - dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction); -} - -static inline void -dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) -{ - /* just sync everything, that's all the pci API can do */ - dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction); -} - -static inline void -dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) -{ - /* just sync everything, that's all the pci API can do */ - dma_sync_single_for_device(dev, dma_handle, offset+size, direction); -} +extern struct dma_map_ops avr32_dma_ops; -/** - * dma_sync_sg_for_cpu - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @sg: list of buffers - * @nents: number of buffers to map - * @dir: DMA transfer direction - * - * Make physical memory consistent for a set of streaming - * mode DMA translations after a transfer. - * - * The same as dma_sync_single_for_* but for a scatter-gather list, - * same rules and usage. - */ -static inline void -dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction direction) +static inline struct dma_map_ops *get_dma_ops(struct device *dev) { - /* - * No need to do anything since the CPU isn't supposed to - * touch this memory after we flushed it at mapping- or - * sync-for-device time. - */ + return &avr32_dma_ops; } -static inline void -dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nents, i) - dma_cache_sync(dev, sg_virt(sg), sg->length, direction); -} - -/* Now for the API extensions over the pci_ one */ - -#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) -#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) - -/* drivers/base/dma-mapping.c */ -extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size); -extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, - void *cpu_addr, dma_addr_t dma_addr, - size_t size); - -#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s) -#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s) +#include <asm-generic/dma-mapping-common.h> #endif /* __ASM_AVR32_DMA_MAPPING_H */ diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c index 50cdb5b10f0f..92cf1fb2b3e6 100644 --- a/arch/avr32/mm/dma-coherent.c +++ b/arch/avr32/mm/dma-coherent.c @@ -9,9 +9,14 @@ #include <linux/dma-mapping.h> #include <linux/gfp.h> #include <linux/export.h> +#include <linux/mm.h> +#include <linux/device.h> +#include <linux/scatterlist.h> -#include <asm/addrspace.h> +#include <asm/processor.h> #include <asm/cacheflush.h> +#include <asm/io.h> +#include <asm/addrspace.h> void dma_cache_sync(struct device *dev, void *vaddr, size_t size, int direction) { @@ -93,60 +98,100 @@ static void __dma_free(struct device *dev, size_t size, __free_page(page++); } -void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *handle, gfp_t gfp) +static void *avr32_dma_alloc(struct device *dev, size_t size, + dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) { struct page *page; - void *ret = NULL; + dma_addr_t phys; page = __dma_alloc(dev, size, handle, gfp); - if (page) - ret = phys_to_uncached(page_to_phys(page)); + if (!page) + return NULL; + phys = page_to_phys(page); - return ret; + if (dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs)) { + /* Now, map the page into P3 with write-combining turned on */ + *handle = phys; + return __ioremap(phys, size, _PAGE_BUFFER); + } else { + return phys_to_uncached(phys); + } } -EXPORT_SYMBOL(dma_alloc_coherent); -void dma_free_coherent(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t handle) +static void avr32_dma_free(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t handle, struct dma_attrs *attrs) { - void *addr = phys_to_cached(uncached_to_phys(cpu_addr)); struct page *page; - pr_debug("dma_free_coherent addr %p (phys %08lx) size %u\n", - cpu_addr, (unsigned long)handle, (unsigned)size); - BUG_ON(!virt_addr_valid(addr)); - page = virt_to_page(addr); + if (dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs)) { + iounmap(cpu_addr); + + page = phys_to_page(handle); + } else { + void *addr = phys_to_cached(uncached_to_phys(cpu_addr)); + + pr_debug("avr32_dma_free addr %p (phys %08lx) size %u\n", + cpu_addr, (unsigned long)handle, (unsigned)size); + + BUG_ON(!virt_addr_valid(addr)); + page = virt_to_page(addr); + } + __dma_free(dev, size, page, handle); } -EXPORT_SYMBOL(dma_free_coherent); -void *dma_alloc_writecombine(struct device *dev, size_t size, - dma_addr_t *handle, gfp_t gfp) +static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction direction, struct dma_attrs *attrs) { - struct page *page; - dma_addr_t phys; + void *cpu_addr = page_address(page) + offset; - page = __dma_alloc(dev, size, handle, gfp); - if (!page) - return NULL; + dma_cache_sync(dev, cpu_addr, size, direction); + return virt_to_bus(cpu_addr); +} - phys = page_to_phys(page); - *handle = phys; +static int avr32_dma_map_sg(struct device *dev, struct scatterlist *sglist, + int nents, enum dma_data_direction direction, + struct dma_attrs *attrs) +{ + int i; + struct scatterlist *sg; + + for_each_sg(sglist, sg, nents, i) { + char *virt; - /* Now, map the page into P3 with write-combining turned on */ - return __ioremap(phys, size, _PAGE_BUFFER); + sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset; + virt = sg_virt(sg); + dma_cache_sync(dev, virt, sg->length, direction); + } + + return nents; } -EXPORT_SYMBOL(dma_alloc_writecombine); -void dma_free_writecombine(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t handle) +static void avr32_dma_sync_single_for_device(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) { - struct page *page; + dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction); +} - iounmap(cpu_addr); +static void avr32_dma_sync_sg_for_device(struct device *dev, + struct scatterlist *sglist, int nents, + enum dma_data_direction direction) +{ + int i; + struct scatterlist *sg; - page = phys_to_page(handle); - __dma_free(dev, size, page, handle); + for_each_sg(sglist, sg, nents, i) + dma_cache_sync(dev, sg_virt(sg), sg->length, direction); } -EXPORT_SYMBOL(dma_free_writecombine); + +struct dma_map_ops avr32_dma_ops = { + .alloc = avr32_dma_alloc, + .free = avr32_dma_free, + .map_page = avr32_dma_map_page, + .map_sg = avr32_dma_map_sg, + .sync_single_for_device = avr32_dma_sync_single_for_device, + .sync_sg_for_device = avr32_dma_sync_sg_for_device, +}; +EXPORT_SYMBOL(avr32_dma_ops); |