| /* MN10300 Scatterlist definitions |
| * |
| * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. |
| * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public Licence |
| * as published by the Free Software Foundation; either version |
| * 2 of the Licence, or (at your option) any later version. |
| */ |
| #ifndef _ASM_SCATTERLIST_H |
| #define _ASM_SCATTERLIST_H |
| |
| #include <asm/types.h> |
| |
| /* |
| * Drivers must set either ->address or (preferred) page and ->offset |
| * to indicate where data must be transferred to/from. |
| * |
| * Using page is recommended since it handles highmem data as well as |
| * low mem. ->address is restricted to data which has a virtual mapping, and |
| * it will go away in the future. Updating to page can be automated very |
| * easily -- something like |
| * |
| * sg->address = some_ptr; |
| * |
| * can be rewritten as |
| * |
| * sg_set_page(virt_to_page(some_ptr)); |
| * sg->offset = (unsigned long) some_ptr & ~PAGE_MASK; |
| * |
| * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens |
| */ |
| struct scatterlist { |
| #ifdef CONFIG_DEBUG_SG |
| unsigned long sg_magic; |
| #endif |
| unsigned long page_link; |
| unsigned int offset; /* for highmem, page offset */ |
| dma_addr_t dma_address; |
| unsigned int length; |
| }; |
| |
| #define ISA_DMA_THRESHOLD (0x00ffffff) |
| |
| #endif /* _ASM_SCATTERLIST_H */ |
