83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/dma-map-ops.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/proc-fns.h>
|
|
|
|
static inline void cache_op(phys_addr_t paddr, size_t size,
|
|
void (*fn)(unsigned long start, unsigned long end))
|
|
{
|
|
struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
|
|
unsigned offset = paddr & ~PAGE_MASK;
|
|
size_t left = size;
|
|
unsigned long start;
|
|
|
|
do {
|
|
size_t len = left;
|
|
|
|
if (PageHighMem(page)) {
|
|
void *addr;
|
|
|
|
if (offset + len > PAGE_SIZE) {
|
|
if (offset >= PAGE_SIZE) {
|
|
page += offset >> PAGE_SHIFT;
|
|
offset &= ~PAGE_MASK;
|
|
}
|
|
len = PAGE_SIZE - offset;
|
|
}
|
|
|
|
addr = kmap_atomic(page);
|
|
start = (unsigned long)(addr + offset);
|
|
fn(start, start + len);
|
|
kunmap_atomic(addr);
|
|
} else {
|
|
start = (unsigned long)phys_to_virt(paddr);
|
|
fn(start, start + size);
|
|
}
|
|
offset = 0;
|
|
page++;
|
|
left -= len;
|
|
} while (left);
|
|
}
|
|
|
|
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
switch (dir) {
|
|
case DMA_FROM_DEVICE:
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
case DMA_BIDIRECTIONAL:
|
|
cache_op(paddr, size, cpu_dma_wb_range);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
switch (dir) {
|
|
case DMA_TO_DEVICE:
|
|
break;
|
|
case DMA_FROM_DEVICE:
|
|
case DMA_BIDIRECTIONAL:
|
|
cache_op(paddr, size, cpu_dma_inval_range);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void arch_dma_prep_coherent(struct page *page, size_t size)
|
|
{
|
|
cache_op(page_to_phys(page), size, cpu_dma_wbinval_range);
|
|
}
|