diff options
Diffstat (limited to 'Documentation/DMA-ISA-LPC.txt')
| -rw-r--r-- | Documentation/DMA-ISA-LPC.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/DMA-ISA-LPC.txt b/Documentation/DMA-ISA-LPC.txt index e767805b4182..b1a19835e907 100644 --- a/Documentation/DMA-ISA-LPC.txt +++ b/Documentation/DMA-ISA-LPC.txt | |||
| @@ -16,7 +16,7 @@ To do ISA style DMA you need to include two headers: | |||
| 16 | #include <asm/dma.h> | 16 | #include <asm/dma.h> |
| 17 | 17 | ||
| 18 | The first is the generic DMA API used to convert virtual addresses to | 18 | The first is the generic DMA API used to convert virtual addresses to |
| 19 | physical addresses (see Documentation/DMA-API.txt for details). | 19 | bus addresses (see Documentation/DMA-API.txt for details). |
| 20 | 20 | ||
| 21 | The second contains the routines specific to ISA DMA transfers. Since | 21 | The second contains the routines specific to ISA DMA transfers. Since |
| 22 | this is not present on all platforms make sure you construct your | 22 | this is not present on all platforms make sure you construct your |
| @@ -50,7 +50,7 @@ early as possible and not release it until the driver is unloaded.) | |||
| 50 | Part III - Address translation | 50 | Part III - Address translation |
| 51 | ------------------------------ | 51 | ------------------------------ |
| 52 | 52 | ||
| 53 | To translate the virtual address to a physical use the normal DMA | 53 | To translate the virtual address to a bus address, use the normal DMA |
| 54 | API. Do _not_ use isa_virt_to_phys() even though it does the same | 54 | API. Do _not_ use isa_virt_to_phys() even though it does the same |
| 55 | thing. The reason for this is that the function isa_virt_to_phys() | 55 | thing. The reason for this is that the function isa_virt_to_phys() |
| 56 | will require a Kconfig dependency to ISA, not just ISA_DMA_API which | 56 | will require a Kconfig dependency to ISA, not just ISA_DMA_API which |