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MIPS: bmips: use generic dma noncoherent ops 

Provide phys_to_dma/dma_to_phys helpers, and the special
arch_sync_dma_for_cpu_all hook, everything else is generic

Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19550/
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 2018-06-15 13:08:52 +02:00 committed by Paul Burton
parent faef87723a
commit d59098a0e9
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
4 changed files with 21 additions and 84 deletions
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3
arch/mips/Kconfig
View File

@ -215,6 +215,8 @@ config ATH79
config BMIPS_GENERIC
bool "Broadcom Generic BMIPS kernel"
select ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
select ARCH_HAS_PHYS_TO_DMA
select BOOT_RAW
select NO_EXCEPT_FILL
select USE_OF
@ -227,7 +229,6 @@ config BMIPS_GENERIC
select BCM7120_L2_IRQ
select BRCMSTB_L2_IRQ
select IRQ_MIPS_CPU
select MIPS_DMA_DEFAULT
select DMA_NONCOHERENT
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_LITTLE_ENDIAN

32
arch/mips/bmips/dma.c
View File

@ -17,7 +17,7 @@
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <dma-coherence.h>
#include <asm/bmips.h>
/*
* BCM338x has configurable address translation windows which allow the
@ -40,7 +40,7 @@ static struct bmips_dma_range *bmips_dma_ranges;
#define FLUSH_RAC 0x100
static dma_addr_t bmips_phys_to_dma(struct device *dev, phys_addr_t pa)
dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t pa)
{
struct bmips_dma_range *r;
@ -52,17 +52,7 @@ static dma_addr_t bmips_phys_to_dma(struct device *dev, phys_addr_t pa)
return pa;
}
dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
{
return bmips_phys_to_dma(dev, virt_to_phys(addr));
}
dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
{
return bmips_phys_to_dma(dev, page_to_phys(page));
}
unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)
phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
struct bmips_dma_range *r;
@ -74,6 +64,22 @@ unsigned long plat_dma_addr_to_phys(struct device *dev, dma_addr_t dma_addr)
return dma_addr;
}
void arch_sync_dma_for_cpu_all(struct device *dev)
{
void __iomem *cbr = BMIPS_GET_CBR();
u32 cfg;
if (boot_cpu_type() != CPU_BMIPS3300 &&
boot_cpu_type() != CPU_BMIPS4350 &&
boot_cpu_type() != CPU_BMIPS4380)
return;
/* Flush stale data out of the readahead cache */
cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
__raw_readl(cbr + BMIPS_RAC_CONFIG);
}
static int __init bmips_init_dma_ranges(void)
{
struct device_node *np =

16
arch/mips/include/asm/bmips.h
View File

@ -123,22 +123,6 @@ static inline void bmips_write_zscm_reg(unsigned int offset, unsigned long data)
barrier();
}
static inline void bmips_post_dma_flush(struct device *dev)
{
void __iomem *cbr = BMIPS_GET_CBR();
u32 cfg;
if (boot_cpu_type() != CPU_BMIPS3300 &&
boot_cpu_type() != CPU_BMIPS4350 &&
boot_cpu_type() != CPU_BMIPS4380)
return;
/* Flush stale data out of the readahead cache */
cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
__raw_readl(cbr + BMIPS_RAC_CONFIG);
}
#endif /* !defined(__ASSEMBLY__) */
#endif /* _ASM_BMIPS_H */

54
arch/mips/include/asm/mach-bmips/dma-coherence.h
View File

@ -1,54 +0,0 @@
/*
* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) 2009 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __ASM_MACH_BMIPS_DMA_COHERENCE_H
#define __ASM_MACH_BMIPS_DMA_COHERENCE_H
#include <asm/bmips.h>
#include <asm/cpu-type.h>
#include <asm/cpu.h>
struct device;
extern dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size);
extern dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page);
extern unsigned long plat_dma_addr_to_phys(struct device *dev,
dma_addr_t dma_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 int plat_device_is_coherent(struct device *dev)
{
return 0;
}
#define plat_post_dma_flush bmips_post_dma_flush
#endif /* __ASM_MACH_BMIPS_DMA_COHERENCE_H */