38 lines
953 B
C
38 lines
953 B
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
|
||
|
|
*/
|
||
|
|
#include <linux/dma-direct.h>
|
||
|
|
#include <asm/ip32/crime.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
|
||
|
|
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
|
||
|
|
{
|
||
|
|
dma_addr_t dma_addr = paddr & RAM_OFFSET_MASK;
|
||
|
|
|
||
|
|
if (!dev)
|
||
|
|
dma_addr += CRIME_HI_MEM_BASE;
|
||
|
|
return dma_addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr)
|
||
|
|
{
|
||
|
|
phys_addr_t paddr = dma_addr & RAM_OFFSET_MASK;
|
||
|
|
|
||
|
|
if (dma_addr >= 256*1024*1024)
|
||
|
|
paddr += CRIME_HI_MEM_BASE;
|
||
|
|
return paddr;
|
||
|
|
}
|