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common.h: Introduce DEFINE_CACHE_ALIGN_BUFFER

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This is the out-of-function-scope counterpart of
ALLOC_CACHE_ALIGN_BUFFER.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@ti.com>
[ilya.yanok]: added missing <linux/compiler.h> include and
{DEFINE,ALLOC}_ALIGN_BUFFER macros allowing explicit alignment
specification.
Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
This commit is contained in:
Marek Vasut 2012-07-15 04:43:47 +00:00
parent eec3866e00
commit de4d11355f
1 changed files with 19 additions and 4 deletions
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23
include/common.h
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@ -39,6 +39,7 @@ typedef volatile unsigned char vu_char;
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <stdarg.h>
#if defined(CONFIG_PCI) && (defined(CONFIG_4xx) && !defined(CONFIG_AP1000))
@ -944,11 +945,25 @@ int cpu_release(int nr, int argc, char * const argv[]);
* of a function scoped static buffer. It can not be used to create a cache
* line aligned global buffer.
*/
#define ALLOC_CACHE_ALIGN_BUFFER(type, name, size) \
char __##name[ROUND(size * sizeof(type), ARCH_DMA_MINALIGN) + \
ARCH_DMA_MINALIGN - 1]; \
#define ALLOC_ALIGN_BUFFER(type, name, size, align) \
char __##name[ROUND(size * sizeof(type), align) + (align - 1)]; \
\
type *name = (type *) ALIGN((uintptr_t)__##name, ARCH_DMA_MINALIGN)
type *name = (type *) ALIGN((uintptr_t)__##name, align)
#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[roundup(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)
/* Pull in stuff for the build system */
#ifdef DO_DEPS_ONLY