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m68k: Use generic dma_noncoherent_ops 

Switch to the generic noncoherent direct mapping implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Christoph Hellwig 2018-06-20 10:19:45 +02:00 committed by Geert Uytterhoeven
parent a8c5cb9943
commit 9eb8be602b
4 changed files with 11 additions and 72 deletions
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2
arch/m68k/Kconfig
View File

@ -2,6 +2,7 @@
config M68K
bool
default y
select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
select HAVE_IDE
@ -24,6 +25,7 @@ config M68K
select MODULES_USE_ELF_RELA
select OLD_SIGSUSPEND3
select OLD_SIGACTION
select DMA_NONCOHERENT_OPS if HAS_DMA
config CPU_BIG_ENDIAN
def_bool y

1
arch/m68k/include/asm/Kbuild
View File

@ -1,6 +1,7 @@
generic-y += barrier.h
generic-y += compat.h
generic-y += device.h
generic-y += dma-mapping.h
generic-y += emergency-restart.h
generic-y += exec.h
generic-y += extable.h

12
arch/m68k/include/asm/dma-mapping.h
View File

@ -1,12 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_DMA_MAPPING_H
#define _M68K_DMA_MAPPING_H
extern const struct dma_map_ops m68k_dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
return &m68k_dma_ops;
}
#endif /* _M68K_DMA_MAPPING_H */

68
arch/m68k/kernel/dma.c
View File

@ -6,7 +6,7 @@
#undef DEBUG
#include <linux/dma-mapping.h>
#include <linux/dma-noncoherent.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
@ -19,7 +19,7 @@
#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
gfp_t flag, unsigned long attrs)
{
struct page *page, **map;
@ -62,7 +62,7 @@ static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
return addr;
}
static void m68k_dma_free(struct device *dev, size_t size, void *addr,
void arch_dma_free(struct device *dev, size_t size, void *addr,
dma_addr_t handle, unsigned long attrs)
{
pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
@ -73,8 +73,8 @@ static void m68k_dma_free(struct device *dev, size_t size, void *addr,
#include <asm/cacheflush.h>
static void *m68k_dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
void *ret;
@ -89,7 +89,7 @@ static void *m68k_dma_alloc(struct device *dev, size_t size,
return ret;
}
static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
free_pages((unsigned long)vaddr, get_order(size));
@ -97,8 +97,8 @@ static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
static void m68k_dma_sync_single_for_device(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
void arch_sync_dma_for_device(struct device *dev, phys_addr_t handle,
size_t size, enum dma_data_direction dir)
{
switch (dir) {
case DMA_BIDIRECTIONAL:
@ -115,58 +115,6 @@ static void m68k_dma_sync_single_for_device(struct device *dev,
}
}
static void m68k_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sglist, int nents, enum dma_data_direction dir)
{
int i;
struct scatterlist *sg;
for_each_sg(sglist, sg, nents, i) {
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
}
static dma_addr_t m68k_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
dma_addr_t handle = page_to_phys(page) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_sync_single_for_device(dev, handle, size, dir);
return handle;
}
static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
int i;
struct scatterlist *sg;
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
dma_sync_single_for_device(dev, sg->dma_address, sg->length,
dir);
}
return nents;
}
const struct dma_map_ops m68k_dma_ops = {
.alloc = m68k_dma_alloc,
.free = m68k_dma_free,
.map_page = m68k_dma_map_page,
.map_sg = m68k_dma_map_sg,
.sync_single_for_device = m68k_dma_sync_single_for_device,
.sync_sg_for_device = m68k_dma_sync_sg_for_device,
};
EXPORT_SYMBOL(m68k_dma_ops);
void arch_setup_pdev_archdata(struct platform_device *pdev)
{
if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&