mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
03df8229a8
Provide phys_to_dma/dma_to_phys helpers, everything else is generic. Signed-off-by: Christoph Hellwig <hch@lst.de> Patchwork: https://patchwork.linux-mips.org/patch/19546/ Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: David Daney <david.daney@cavium.com> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org
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;
|
|
}
|