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Message-Id: <20180522120430.28709-11-hch@lst.de>
Date: Tue, 22 May 2018 14:04:15 +0200
From: Christoph Hellwig <hch@....de>
To: iommu@...ts.linux-foundation.org
Cc: linux-arch@...r.kernel.org, Michal Simek <monstr@...str.eu>,
Greentime Hu <green.hu@...il.com>,
Vincent Chen <deanbo422@...il.com>,
linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
linux-hexagon@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
nios2-dev@...ts.rocketboards.org, openrisc@...ts.librecores.org,
linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 10/25] nds32: use generic dma_noncoherent_ops
Switch to the generic noncoherent direct mapping implementation.
Signed-off-by: Christoph Hellwig <hch@....de>
---
arch/nds32/Kconfig | 3 +
arch/nds32/include/asm/Kbuild | 1 +
arch/nds32/include/asm/dma-mapping.h | 14 ----
arch/nds32/kernel/dma.c | 113 +++------------------------
4 files changed, 15 insertions(+), 116 deletions(-)
delete mode 100644 arch/nds32/include/asm/dma-mapping.h
diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index 249f38d3388f..67d0ac0a989c 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -5,10 +5,13 @@
config NDS32
def_bool y
+ select ARCH_HAS_SYNC_DMA_FOR_CPU
+ select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_WANT_FRAME_POINTERS if FTRACE
select CLKSRC_MMIO
select CLONE_BACKWARDS
select COMMON_CLK
+ select DMA_NONCOHERENT_OPS
select GENERIC_ATOMIC64
select GENERIC_CPU_DEVICES
select GENERIC_CLOCKEVENTS
diff --git a/arch/nds32/include/asm/Kbuild b/arch/nds32/include/asm/Kbuild
index 06bdf8167f5a..b3e951f805f8 100644
--- a/arch/nds32/include/asm/Kbuild
+++ b/arch/nds32/include/asm/Kbuild
@@ -13,6 +13,7 @@ generic-y += cputime.h
generic-y += device.h
generic-y += div64.h
generic-y += dma.h
+generic-y += dma-mapping.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
diff --git a/arch/nds32/include/asm/dma-mapping.h b/arch/nds32/include/asm/dma-mapping.h
deleted file mode 100644
index 2dd47d245c25..000000000000
--- a/arch/nds32/include/asm/dma-mapping.h
+++ /dev/null
@@ -1,14 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2017 Andes Technology Corporation
-
-#ifndef ASMNDS32_DMA_MAPPING_H
-#define ASMNDS32_DMA_MAPPING_H
-
-extern struct dma_map_ops nds32_dma_ops;
-
-static inline struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
- return &nds32_dma_ops;
-}
-
-#endif
diff --git a/arch/nds32/kernel/dma.c b/arch/nds32/kernel/dma.c
index 43d7fd432bb6..2b3167a1f259 100644
--- a/arch/nds32/kernel/dma.c
+++ b/arch/nds32/kernel/dma.c
@@ -3,17 +3,14 @@
#include <linux/types.h>
#include <linux/mm.h>
-#include <linux/export.h>
#include <linux/string.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-noncoherent.h>
#include <linux/io.h>
#include <linux/cache.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-#include <asm/dma-mapping.h>
#include <asm/proc-fns.h>
/*
@@ -119,10 +116,8 @@ static struct arch_vm_region *vm_region_find(struct arch_vm_region *head,
return c;
}
-/* FIXME: attrs is not used. */
-static void *nds32_dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t * handle, gfp_t gfp,
- unsigned long attrs)
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
+ gfp_t gfp, unsigned long attrs)
{
struct page *page;
struct arch_vm_region *c;
@@ -227,8 +222,8 @@ static void *nds32_dma_alloc_coherent(struct device *dev, size_t size,
return NULL;
}
-static void nds32_dma_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, unsigned long attrs)
+void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
+ dma_addr_t handle, unsigned long attrs)
{
struct arch_vm_region *c;
unsigned long flags, addr;
@@ -329,11 +324,10 @@ static int __init consistent_init(void)
core_initcall(consistent_init);
-static void
-nds32_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 paddr,
+ size_t size, enum dma_data_direction dir)
{
- unsigned long start = (unsigned long)phys_to_virt(handle);
+ unsigned long start = (unsigned long)phys_to_virt(paddr);
switch (dir) {
case DMA_FROM_DEVICE:
@@ -347,11 +341,10 @@ nds32_dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
}
}
-static void
-nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir)
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
- unsigned long start = (unsigned long)phys_to_virt(handle);
+ unsigned long start = (unsigned long)phys_to_virt(paddr);
switch (dir) {
case DMA_TO_DEVICE:
@@ -364,87 +357,3 @@ nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
BUG();
}
}
-
-static dma_addr_t nds32_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 dma_addr = page_to_phys(page) + offset;
-
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- nds32_dma_sync_single_for_device(dev, handle, size, dir);
- return dma_addr;
-}
-
-static void nds32_dma_unmap_page(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- nds32_dma_sync_single_for_cpu(dev, handle, size, dir);
-}
-
-static void
-nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- int i;
-
- for (i = 0; i < nents; i++, sg++) {
- nds32_dma_sync_single_for_device(dev, sg_dma_address(sg),
- sg->length, dir);
- }
-}
-
-static void
-nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
-{
- int i;
-
- for (i = 0; i < nents; i++, sg++) {
- nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
- sg->length, dir);
- }
-}
-
-static int nds32_dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
-{
- int i;
-
- for (i = 0; i < nents; i++, sg++) {
- nds32_dma_sync_single_for_device(dev, sg_dma_address(sg),
- sg->length, dir);
- }
- return nents;
-}
-
-static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nhwentries, enum dma_data_direction dir,
- unsigned long attrs)
-{
- int i;
-
- for (i = 0; i < nhwentries; i++, sg++) {
- nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
- sg->length, dir);
- }
-}
-
-struct dma_map_ops nds32_dma_ops = {
- .alloc = nds32_dma_alloc_coherent,
- .free = nds32_dma_free,
- .map_page = nds32_dma_map_page,
- .unmap_page = nds32_dma_unmap_page,
- .map_sg = nds32_dma_map_sg,
- .unmap_sg = nds32_dma_unmap_sg,
- .sync_single_for_device = nds32_dma_sync_single_for_device,
- .sync_single_for_cpu = nds32_dma_sync_single_for_cpu,
- .sync_sg_for_cpu = nds32_dma_sync_sg_for_cpu,
- .sync_sg_for_device = nds32_dma_sync_sg_for_device,
-};
-
-EXPORT_SYMBOL(nds32_dma_ops);
--
2.17.0
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