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AVR32: Implement simple DMA memory allocator

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Implement dma_alloc_coherent() which returns cache-aligned
uncacheable memory.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen 2006-12-17 15:39:15 +01:00
parent 91975b0fea
commit d5acb95b16
1 changed files with 51 additions and 0 deletions
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51
lib_avr32/board.c
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@ -76,6 +76,50 @@ void *sbrk(ptrdiff_t increment)
return ((void *)old);
}
#ifdef CFG_DMA_ALLOC_LEN
#include <asm/cacheflush.h>
#include <asm/io.h>
static unsigned long dma_alloc_start;
static unsigned long dma_alloc_end;
static unsigned long dma_alloc_brk;
static void dma_alloc_init(void)
{
unsigned long monitor_addr;
monitor_addr = CFG_MONITOR_BASE + gd->reloc_off;
dma_alloc_end = monitor_addr - CFG_MALLOC_LEN;
dma_alloc_start = dma_alloc_end - CFG_DMA_ALLOC_LEN;
dma_alloc_brk = dma_alloc_start;
printf("DMA: Using memory from 0x%08lx to 0x%08lx\n",
dma_alloc_start, dma_alloc_end);
dcache_invalidate_range(cached(dma_alloc_start),
dma_alloc_end - dma_alloc_start);
}
void *dma_alloc_coherent(size_t len, unsigned long *handle)
{
unsigned long paddr = dma_alloc_brk;
if (dma_alloc_brk + len > dma_alloc_end)
return NULL;
dma_alloc_brk = ((paddr + len + CFG_DCACHE_LINESZ - 1)
& ~(CFG_DCACHE_LINESZ - 1));
*handle = paddr;
return uncached(paddr);
}
#else
static inline void dma_alloc_init(void)
{
}
#endif
static int init_baudrate(void)
{
char tmp[64];
@ -179,6 +223,12 @@ void board_init_f(ulong board_type)
/* Reserve memory for malloc() */
addr -= CFG_MALLOC_LEN;
#ifdef CFG_DMA_ALLOC_LEN
/* Reserve DMA memory (must be cache aligned) */
addr &= ~(CFG_DCACHE_LINESZ - 1);
addr -= CFG_DMA_ALLOC_LEN;
#endif
/* Allocate a Board Info struct on a word boundary */
addr -= sizeof(bd_t);
addr &= ~3UL;
@ -258,6 +308,7 @@ void board_init_r(gd_t *new_gd, ulong dest_addr)
timer_init();
mem_malloc_init();
malloc_bin_reloc();
dma_alloc_init();
board_init_info();
flash_init();