From ae49e807951d5e26767bc55d1dc29671c596c450 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 13 May 2009 22:56:34 +0000 Subject: asm-generic: add legacy I/O header files The dma.h, hw_irq.h, serial.h and timex.h files originally described PC-style i8237, i8259A, i8250, i8253 and i8255 chips as well as the VGA style text mode graphics. Modern architectures live happily without these specific interfaces, but a few definitions from these headers keep getting used in common code. The new generic headers are what most architectures use anyway nowadays, just implementing the minimal definitions. Signed-off-by: Remis Lima Baima Signed-off-by: Arnd Bergmann --- include/asm-generic/dma.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 include/asm-generic/dma.h (limited to 'include/asm-generic/dma.h') diff --git a/include/asm-generic/dma.h b/include/asm-generic/dma.h new file mode 100644 index 00000000000..9dfc3a7f36d --- /dev/null +++ b/include/asm-generic/dma.h @@ -0,0 +1,15 @@ +#ifndef __ASM_GENERIC_DMA_H +#define __ASM_GENERIC_DMA_H +/* + * This file traditionally describes the i8237 PC style DMA controller. + * Most architectures don't have these any more and can get the minimal + * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS. + * + * Some code relies on seeing MAX_DMA_ADDRESS though. + */ +#define MAX_DMA_ADDRESS PAGE_OFFSET + +extern int request_dma(unsigned int dmanr, const char *device_id); +extern void free_dma(unsigned int dmanr); + +#endif /* __ASM_GENERIC_DMA_H */ -- cgit v1.2.3