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/*
* Support for DMA from PCI devices to main memory on
* machines without an iommu or with directly addressable
* RAM (typically a pmac with 2Gb of RAM or less)
*
* Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/abs_addr.h>
#include <asm/ppc-pci.h>
static void *pci_direct_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
void *ret;
ret = (void *)__get_free_pages(flag, get_order(size));
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_abs(ret);
}
return ret;
}
static void pci_direct_free_coherent(struct device *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
free_pages((unsigned long)vaddr, get_order(size));
}
static dma_addr_t pci_direct_map_single(struct device *hwdev, void *ptr,
size_t size, enum dma_data_direction direction)
{
return virt_to_abs(ptr);
}
static void pci_direct_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction direction)
{
}
static int pci_direct_map_sg(struct device *hwdev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
int i;
for (i = 0; i < nents; i++, sg++) {
sg->dma_address = page_to_phys(sg->page) + sg->offset;
sg->dma_length = sg->length;
}
return nents;
}
static void pci_direct_unmap_sg(struct device *hwdev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
}
static int pci_direct_dma_supported(struct device *dev, u64 mask)
{
return mask < 0x100000000ull;
}
static struct dma_mapping_ops pci_direct_ops = {
.alloc_coherent = pci_direct_alloc_coherent,
.free_coherent = pci_direct_free_coherent,
.map_single = pci_direct_map_single,
.unmap_single = pci_direct_unmap_single,
.map_sg = pci_direct_map_sg,
.unmap_sg = pci_direct_unmap_sg,
.dma_supported = pci_direct_dma_supported,
};
void __init pci_direct_iommu_init(void)
{
pci_dma_ops = pci_direct_ops;
}
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