xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

h8300: use dma-direct

Browse Source 
Replace the bare-bones h8300 direct dma mapping implementation with
the fully featured generic dma-direct one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
2018-01-09 16:32:29 +01:00
parent f73337f4ce
commit 23475ad49e
5 changed files with 3 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/h8300/kernel/Makefile
View File

@@ -7,7 +7,7 @@ extra-y := vmlinux.lds
obj-y := process.o traps.o ptrace.o \
signal.o setup.o syscalls.o \
irq.o entry.o dma.o
irq.o entry.o
obj-$(CONFIG_ROMKERNEL) += head_rom.o
obj-$(CONFIG_RAMKERNEL) += head_ram.o

66
arch/h8300/kernel/dma.c
View File

@@ -1,66 +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.
*/
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
#include <asm/pgalloc.h>
static void *dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs)
{
void *ret;
if (dev == NULL || (*dev->dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_phys(ret);
}
return ret;
}
static void 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));
}
static dma_addr_t map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
unsigned long attrs)
{
return page_to_phys(page) + offset;
}
static int map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction,
unsigned long attrs)
{
struct scatterlist *sg;
int i;
for_each_sg(sgl, sg, nents, i) {
sg->dma_address = sg_phys(sg);
}
return nents;
}
const struct dma_map_ops h8300_dma_map_ops = {
.alloc = dma_alloc,
.free = dma_free,
.map_page = map_page,
.map_sg = map_sg,
};
EXPORT_SYMBOL(h8300_dma_map_ops);