1/* 2 * arch/sh/drivers/pci/dma-dreamcast.c 3 * 4 * PCI DMA support for the Sega Dreamcast 5 * 6 * Copyright (C) 2001, 2002 M. R. Brown 7 * Copyright (C) 2002, 2003 Paul Mundt 8 * 9 * This file originally bore the message (with enclosed-$): 10 * Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp 11 * Dreamcast PCI: Supports SEGA Broadband Adaptor only. 12 * 13 * This file is subject to the terms and conditions of the GNU General Public 14 * License. See the file "COPYING" in the main directory of this archive 15 * for more details. 16 */ 17 18#include <linux/sched.h> 19#include <linux/kernel.h> 20#include <linux/param.h> 21#include <linux/interrupt.h> 22#include <linux/init.h> 23#include <linux/irq.h> 24#include <linux/pci.h> 25#include <linux/dma-mapping.h> 26#include <linux/device.h> 27 28#include <asm/io.h> 29#include <asm/irq.h> 30#include <asm/mach/pci.h> 31 32static int gapspci_dma_used = 0; 33 34void *dreamcast_consistent_alloc(struct device *dev, size_t size, 35 dma_addr_t *dma_handle, gfp_t flag) 36{ 37 unsigned long buf; 38 39 if (dev && dev->bus != &pci_bus_type) 40 return NULL; 41 42 if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE) 43 return ERR_PTR(-EINVAL); 44 45 buf = GAPSPCI_DMA_BASE + gapspci_dma_used; 46 47 gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size); 48 49 *dma_handle = (dma_addr_t)buf; 50 51 buf = P2SEGADDR(buf); 52 53 /* Flush the dcache before we hand off the buffer */ 54 dma_cache_wback_inv((void *)buf, size); 55 56 return (void *)buf; 57} 58 59int dreamcast_consistent_free(struct device *dev, size_t size, 60 void *vaddr, dma_addr_t dma_handle) 61{ 62 if (dev && dev->bus != &pci_bus_type) 63 return -EINVAL; 64 65 gapspci_dma_used = 0; 66 67 return 0; 68} 69