mirror of https://gitee.com/openkylin/linux.git
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
|
|
* 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) 2006 Ralf Baechle <ralf@linux-mips.org>
|
|
*
|
|
*/
|
|
#ifndef __ASM_MACH_IP32_DMA_COHERENCE_H
|
|
#define __ASM_MACH_IP32_DMA_COHERENCE_H
|
|
|
|
#include <asm/ip32/crime.h>
|
|
|
|
struct device;
|
|
|
|
/*
|
|
* Few notes.
|
|
* 1. CPU sees memory as two chunks: 0-256M@0x0, and the rest @0x40000000+256M
|
|
* 2. PCI sees memory as one big chunk @0x0 (or we could use 0x40000000 for
|
|
* native-endian)
|
|
* 3. All other devices see memory as one big chunk at 0x40000000
|
|
* 4. Non-PCI devices will pass NULL as struct device*
|
|
*
|
|
* Thus we translate differently, depending on device.
|
|
*/
|
|
|
|
#define RAM_OFFSET_MASK 0x3fffffffUL
|
|
|
|
static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
|
|
size_t size)
|
|
{
|
|
dma_addr_t pa = virt_to_phys(addr) & RAM_OFFSET_MASK;
|
|
|
|
if (dev == NULL)
|
|
pa += CRIME_HI_MEM_BASE;
|
|
|
|
return pa;
|
|
}
|
|
|
|
static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
|
|
struct page *page)
|
|
{
|
|
dma_addr_t pa;
|
|
|
|
pa = page_to_phys(page) & RAM_OFFSET_MASK;
|
|
|
|
if (dev == NULL)
|
|
pa += CRIME_HI_MEM_BASE;
|
|
|
|
return pa;
|
|
}
|
|
|
|
/* This is almost certainly wrong but it's what dma-ip32.c used to use */
|
|
static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
unsigned long addr = dma_addr & RAM_OFFSET_MASK;
|
|
|
|
if (dma_addr >= 256*1024*1024)
|
|
addr += CRIME_HI_MEM_BASE;
|
|
|
|
return addr;
|
|
}
|
|
|
|
static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr,
|
|
size_t size, enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
static inline int plat_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
/*
|
|
* we fall back to GFP_DMA when the mask isn't all 1s,
|
|
* so we can't guarantee allocations that must be
|
|
* within a tighter range than GFP_DMA..
|
|
*/
|
|
if (mask < DMA_BIT_MASK(24))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline void plat_extra_sync_for_device(struct device *dev)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline int plat_dma_mapping_error(struct device *dev,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int plat_device_is_coherent(struct device *dev)
|
|
{
|
|
return 0; /* IP32 is non-cohernet */
|
|
}
|
|
|
|
#endif /* __ASM_MACH_IP32_DMA_COHERENCE_H */
|