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Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
-rw-r--r--arch/powerpc/kernel/dma-swiotlb.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 46943651da23..bd1a2aba599f 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -12,6 +12,7 @@
*/
#include <linux/dma-mapping.h>
+#include <linux/memblock.h>
#include <linux/pfn.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@@ -20,7 +21,6 @@
#include <asm/machdep.h>
#include <asm/swiotlb.h>
#include <asm/dma.h>
-#include <asm/abs_addr.h>
unsigned int ppc_swiotlb_enable;
@@ -105,3 +105,23 @@ int __init swiotlb_setup_bus_notifier(void)
&ppc_swiotlb_plat_bus_notifier);
return 0;
}
+
+void swiotlb_detect_4g(void)
+{
+ if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
+ ppc_swiotlb_enable = 1;
+}
+
+static int __init swiotlb_late_init(void)
+{
+ if (ppc_swiotlb_enable) {
+ swiotlb_print_info();
+ set_pci_dma_ops(&swiotlb_dma_ops);
+ ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
+ } else {
+ swiotlb_free();
+ }
+
+ return 0;
+}
+subsys_initcall(swiotlb_late_init);