diff options
Diffstat (limited to 'include/common.h')
| -rw-r--r-- | include/common.h | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/include/common.h b/include/common.h index c48e5bc11b..68b24d0778 100644 --- a/include/common.h +++ b/include/common.h @@ -974,93 +974,6 @@ int cpu_release(int nr, int argc, char * const argv[]); #define ROUND(a,b) (((a) + (b) - 1) & ~((b) - 1)) /* - * ARCH_DMA_MINALIGN is defined in asm/cache.h for each architecture. It - * is used to align DMA buffers. - */ -#ifndef __ASSEMBLY__ -#include <asm/cache.h> -#endif - -/* - * The ALLOC_CACHE_ALIGN_BUFFER macro is used to allocate a buffer on the - * stack that meets the minimum architecture alignment requirements for DMA. - * Such a buffer is useful for DMA operations where flushing and invalidating - * the cache before and after a read and/or write operation is required for - * correct operations. - * - * When called the macro creates an array on the stack that is sized such - * that: - * - * 1) The beginning of the array can be advanced enough to be aligned. - * - * 2) The size of the aligned portion of the array is a multiple of the minimum - * architecture alignment required for DMA. - * - * 3) The aligned portion contains enough space for the original number of - * elements requested. - * - * The macro then creates a pointer to the aligned portion of this array and - * assigns to the pointer the address of the first element in the aligned - * portion of the array. - * - * Calling the macro as: - * - * ALLOC_CACHE_ALIGN_BUFFER(uint32_t, buffer, 1024); - * - * Will result in something similar to saying: - * - * uint32_t buffer[1024]; - * - * The following differences exist: - * - * 1) The resulting buffer is guaranteed to be aligned to the value of - * ARCH_DMA_MINALIGN. - * - * 2) The buffer variable created by the macro is a pointer to the specified - * type, and NOT an array of the specified type. This can be very important - * if you want the address of the buffer, which you probably do, to pass it - * to the DMA hardware. The value of &buffer is different in the two cases. - * In the macro case it will be the address of the pointer, not the address - * of the space reserved for the buffer. However, in the second case it - * would be the address of the buffer. So if you are replacing hard coded - * stack buffers with this macro you need to make sure you remove the & from - * the locations where you are taking the address of the buffer. - * - * Note that the size parameter is the number of array elements to allocate, - * not the number of bytes. - * - * This macro can not be used outside of function scope, or for the creation - * of a function scoped static buffer. It can not be used to create a cache - * line aligned global buffer. - */ -#define PAD_COUNT(s, pad) (((s) - 1) / (pad) + 1) -#define PAD_SIZE(s, pad) (PAD_COUNT(s, pad) * pad) -#define ALLOC_ALIGN_BUFFER_PAD(type, name, size, align, pad) \ - char __##name[ROUND(PAD_SIZE((size) * sizeof(type), pad), align) \ - + (align - 1)]; \ - \ - type *name = (type *) ALIGN((uintptr_t)__##name, align) -#define ALLOC_ALIGN_BUFFER(type, name, size, align) \ - ALLOC_ALIGN_BUFFER_PAD(type, name, size, align, 1) -#define ALLOC_CACHE_ALIGN_BUFFER_PAD(type, name, size, pad) \ - ALLOC_ALIGN_BUFFER_PAD(type, name, size, ARCH_DMA_MINALIGN, pad) -#define ALLOC_CACHE_ALIGN_BUFFER(type, name, size) \ - ALLOC_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN) - -/* - * DEFINE_CACHE_ALIGN_BUFFER() is similar to ALLOC_CACHE_ALIGN_BUFFER, but it's - * purpose is to allow allocating aligned buffers outside of function scope. - * Usage of this macro shall be avoided or used with extreme care! - */ -#define DEFINE_ALIGN_BUFFER(type, name, size, align) \ - static char __##name[ALIGN(size * sizeof(type), align)] \ - __aligned(align); \ - \ - static type *name = (type *)__##name -#define DEFINE_CACHE_ALIGN_BUFFER(type, name, size) \ - DEFINE_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN) - -/* * check_member() - Check the offset of a structure member * * @structure: Name of structure (e.g. global_data) |
