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pci-dma.c
Package: linux-2.4.20.tar.gz [view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 1k
Category:
Linux-Unix program
Development Platform:
Unix_Linux
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
- * Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org>
- * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/string.h>
- #include <linux/pci.h>
- #include <asm/io.h>
- void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
- dma_addr_t * dma_handle)
- {
- void *ret;
- int gfp = GFP_ATOMIC;
- #ifdef CONFIG_ISA
- if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
- gfp |= GFP_DMA;
- #endif
- ret = (void *) __get_free_pages(gfp, get_order(size));
- if (ret != NULL) {
- memset(ret, 0, size);
- *dma_handle = bus_to_baddr(hwdev->bus->number, __pa(ret));
- #ifdef CONFIG_NONCOHERENT_IO
- dma_cache_wback_inv((unsigned long) ret, size);
- ret = UNCAC_ADDR(ret);
- #endif
- }
- return ret;
- }
- void pci_free_consistent(struct pci_dev *hwdev, size_t size,
- void *vaddr, dma_addr_t dma_handle)
- {
- unsigned long addr = (unsigned long) vaddr;
- #ifdef CONFIG_NONCOHERENT_IO
- addr = CAC_ADDR(addr);
- #endif
- free_pages(addr, get_order(size));
- }
- EXPORT_SYMBOL(pci_alloc_consistent);
- EXPORT_SYMBOL(pci_free_consistent);