diff options
Diffstat (limited to 'arch/hexagon/kernel')
| -rw-r--r-- | arch/hexagon/kernel/dma.c | 57 |
1 files changed, 11 insertions, 46 deletions
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c index 00b9a81075dd..882680e81a30 100644 --- a/arch/hexagon/kernel/dma.c +++ b/arch/hexagon/kernel/dma.c @@ -7,54 +7,8 @@ #include <linux/dma-map-ops.h> #include <linux/memblock.h> -#include <linux/genalloc.h> -#include <linux/module.h> #include <asm/page.h> -static struct gen_pool *coherent_pool; - - -/* Allocates from a pool of uncached memory that was reserved at boot time */ - -void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_addr, - gfp_t flag, unsigned long attrs) -{ - void *ret; - - /* - * Our max_low_pfn should have been backed off by 16MB in - * mm/init.c to create DMA coherent space. Use that as the VA - * for the pool. - */ - - if (coherent_pool == NULL) { - coherent_pool = gen_pool_create(PAGE_SHIFT, -1); - - if (coherent_pool == NULL) - panic("Can't create %s() memory pool!", __func__); - else - gen_pool_add(coherent_pool, - (unsigned long)pfn_to_virt(max_low_pfn), - hexagon_coherent_pool_size, -1); - } - - ret = (void *) gen_pool_alloc(coherent_pool, size); - - if (ret) { - memset(ret, 0, size); - *dma_addr = (dma_addr_t) virt_to_phys(ret); - } else - *dma_addr = ~0; - - return ret; -} - -void arch_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_addr, unsigned long attrs) -{ - gen_pool_free(coherent_pool, (unsigned long) vaddr, size); -} - void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, enum dma_data_direction dir) { @@ -77,3 +31,14 @@ void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, BUG(); } } + +/* + * Our max_low_pfn should have been backed off by 16MB in mm/init.c to create + * DMA coherent space. Use that for the pool. + */ +static int __init hexagon_dma_init(void) +{ + return dma_init_global_coherent(PFN_PHYS(max_low_pfn), + hexagon_coherent_pool_size); +} +core_initcall(hexagon_dma_init); |