diff options
Diffstat (limited to 'lib_avr32/board.c')
| -rw-r--r-- | lib_avr32/board.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/lib_avr32/board.c b/lib_avr32/board.c index a407bca..2f16386 100644 --- a/lib_avr32/board.c +++ b/lib_avr32/board.c @@ -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(); |