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/*
*
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
* Copyright (C) 2000-2004 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/iommu.h>
#include <linux/io.h>
#include <linux/vmalloc.h>
#include <linux/sizes.h>
#define NO_KERNEL_MAPPING_DUMMY 0x2222
void *removed_alloc(struct device *dev, size_t size, dma_addr_t *handle,
gfp_t gfp, struct dma_attrs *attrs)
{
bool no_kernel_mapping = dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING,
attrs);
bool skip_zeroing = dma_get_attr(DMA_ATTR_SKIP_ZEROING, attrs);
unsigned long pfn;
unsigned long order = get_order(size);
void *addr = NULL;
size = PAGE_ALIGN(size);
if (!(gfp & __GFP_WAIT))
return NULL;
pfn = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, order);
if (pfn) {
if (no_kernel_mapping && skip_zeroing) {
*handle = __pfn_to_phys(pfn);
return (void *)NO_KERNEL_MAPPING_DUMMY;
}
addr = ioremap(__pfn_to_phys(pfn), size);
if (WARN_ON(!addr)) {
dma_release_from_contiguous(dev, pfn, order);
} else {
if (!skip_zeroing)
memset(addr, 0, size);
if (no_kernel_mapping) {
iounmap(addr);
addr = (void *)NO_KERNEL_MAPPING_DUMMY;
}
*handle = __pfn_to_phys(pfn);
}
}
return addr;
}
int removed_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
struct dma_attrs *attrs)
{
return -ENXIO;
}
void removed_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle, struct dma_attrs *attrs)
{
bool no_kernel_mapping = dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING,
attrs);
if (!no_kernel_mapping)
iounmap(cpu_addr);
dma_release_from_contiguous(dev, __phys_to_pfn(handle),
size >> PAGE_SHIFT);
}
static dma_addr_t removed_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return ~(dma_addr_t)0;
}
static void removed_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return;
}
static int removed_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return 0;
}
static void removed_unmap_sg(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return;
}
static void removed_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
return;
}
void removed_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
return;
}
void removed_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
return;
}
void removed_sync_sg_for_device(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
return;
}
struct dma_map_ops removed_dma_ops = {
.alloc = removed_alloc,
.free = removed_free,
.mmap = removed_mmap,
.map_page = removed_map_page,
.unmap_page = removed_unmap_page,
.map_sg = removed_map_sg,
.unmap_sg = removed_unmap_sg,
.sync_single_for_cpu = removed_sync_single_for_cpu,
.sync_single_for_device = removed_sync_single_for_device,
.sync_sg_for_cpu = removed_sync_sg_for_cpu,
.sync_sg_for_device = removed_sync_sg_for_device,
};
EXPORT_SYMBOL(removed_dma_ops);
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