diff options
Diffstat (limited to 'arch/mn10300/mm/dma-alloc.c')
| -rw-r--r-- | arch/mn10300/mm/dma-alloc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/mn10300/mm/dma-alloc.c b/arch/mn10300/mm/dma-alloc.c index f3649d8f50e..4e34880bea0 100644 --- a/arch/mn10300/mm/dma-alloc.c +++ b/arch/mn10300/mm/dma-alloc.c @@ -14,14 +14,27 @@ #include <linux/mm.h> #include <linux/string.h> #include <linux/pci.h> +#include <linux/gfp.h> #include <asm/io.h> +static unsigned long pci_sram_allocated = 0xbc000000; + void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, int gfp) { unsigned long addr; void *ret; + printk("dma_alloc_coherent(%s,%zu,,%x)\n", dev_name(dev), size, gfp); + + if (0xbe000000 - pci_sram_allocated >= size) { + size = (size + 255) & ~255; + addr = pci_sram_allocated; + pci_sram_allocated += size; + ret = (void *) addr; + goto done; + } + /* ignore region specifiers */ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); @@ -41,7 +54,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size, /* write back and evict all cache lines covering this region */ mn10300_dcache_flush_inv_range2(virt_to_phys((void *) addr), PAGE_SIZE); +done: *dma_handle = virt_to_bus((void *) addr); + printk("dma_alloc_coherent() = %p [%x]\n", ret, *dma_handle); return ret; } EXPORT_SYMBOL(dma_alloc_coherent); @@ -51,6 +66,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr, { unsigned long addr = (unsigned long) vaddr & ~0x20000000; + if (addr >= 0x9c000000) + return; + free_pages(addr, get_order(size)); } EXPORT_SYMBOL(dma_free_coherent); |