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MIPS: loongson64: use generic dma noncoherent ops

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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/19545/
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
This commit is contained in:
Christoph Hellwig 2018-06-20 09:11:15 +02:00 committed by Paul Burton
parent f8c55dc6e8
commit e905086e6b
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GPG Key ID: 3EA79FACB57500DD
5 changed files with 20 additions and 71 deletions
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1
arch/mips/Kconfig
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@ -1828,6 +1828,7 @@ config CPU_LOONGSON2
select CPU_SUPPORTS_64BIT_KERNEL
select CPU_SUPPORTS_HIGHMEM
select CPU_SUPPORTS_HUGEPAGES
select ARCH_HAS_PHYS_TO_DMA
config CPU_LOONGSON1
bool

69
arch/mips/include/asm/mach-loongson64/dma-coherence.h
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@ -1,69 +0,0 @@
/*
* 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, 07 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
* Author: Fuxin Zhang, zhangfx@lemote.com
*
*/
#ifndef __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
#define __ASM_MACH_LOONGSON64_DMA_COHERENCE_H
#ifdef CONFIG_SWIOTLB
#include <linux/swiotlb.h>
#endif
struct device;
static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
size_t size)
{
return virt_to_phys(addr) | 0x80000000;
}
static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
struct page *page)
{
return page_to_phys(page) | 0x80000000;
}
static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
dma_addr_t dma_addr)
{
#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
#else
return dma_addr & 0x7fffffff;
#endif
}
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 int plat_device_is_coherent(struct device *dev)
{
return 0;
}
static inline void plat_post_dma_flush(struct device *dev)
{
}
#endif /* __ASM_MACH_LOONGSON64_DMA_COHERENCE_H */

2
arch/mips/loongson64/Kconfig
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@ -13,7 +13,6 @@ config LEMOTE_FULOONG2E
select CSRC_R4K
select SYS_HAS_CPU_LOONGSON2E
select DMA_NONCOHERENT
select MIPS_DMA_DEFAULT
select BOOT_ELF32
select BOARD_SCACHE
select HW_HAS_PCI
@ -45,7 +44,6 @@ config LEMOTE_MACH2F
select CS5536
select CSRC_R4K if ! MIPS_EXTERNAL_TIMER
select DMA_NONCOHERENT
select MIPS_DMA_DEFAULT
select GENERIC_ISA_DMA_SUPPORT_BROKEN
select HAVE_CLK
select HW_HAS_PCI

1
arch/mips/loongson64/common/Makefile
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@ -6,6 +6,7 @@
obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
bonito-irq.o mem.o machtype.o platform.o serial.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_CPU_LOONGSON2) += dma.o
#
# Serial port support

18
arch/mips/loongson64/common/dma.c Normal file
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@ -0,0 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/dma-direct.h>
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return paddr | 0x80000000;
}
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
if (dma_addr > 0x8fffffff)
return dma_addr;
return dma_addr & 0x0fffffff;
#else
return dma_addr & 0x7fffffff;
#endif
}