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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 14:09:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 14:09:37 -0700
commit2ab054fd1f88d7d22e6df7c34c41a2f9782c3f08 (patch)
tree73d6a8a562a5509a70be248d853ba0b67820a2a3 /arch/openrisc
parent2f34a64aeac4d87e8ed8275d9f1230e18a50079c (diff)
parent5600779ea5f3d29fadc62208e21feb0bb9b813aa (diff)
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Merge tag 'for-linus' of git://github.com/openrisc/linux
Pull OpenRISC update from Stafford Horne: "Just one change for 4.19: refactoring from Christoph Hellwig to use generic DMA facilities" * tag 'for-linus' of git://github.com/openrisc/linux: openrisc: use generic dma_noncoherent_ops openrisc: fix cache maintainance the the sync_single_for_device DMA operation openrisc: remove the no-op unmap_page and unmap_sg DMA operations openrisc: remove the sync_single_for_cpu DMA operation
Diffstat (limited to 'arch/openrisc')
-rw-r--r--arch/openrisc/Kconfig2
-rw-r--r--arch/openrisc/include/asm/Kbuild1
-rw-r--r--arch/openrisc/include/asm/dma-mapping.h35
-rw-r--r--arch/openrisc/kernel/dma.c107
4 files changed, 12 insertions, 133 deletions
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index ed5f32d8fbd8..e0081e734827 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -6,6 +6,8 @@
config OPENRISC
def_bool y
+ select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select DMA_NONCOHERENT_OPS
select OF
select OF_EARLY_FLATTREE
select IRQ_DOMAIN
diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index 65964d390b10..eb87cd8327c8 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -7,6 +7,7 @@ generic-y += current.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 += exec.h
generic-y += extable.h
diff --git a/arch/openrisc/include/asm/dma-mapping.h b/arch/openrisc/include/asm/dma-mapping.h
deleted file mode 100644
index e212a1f0b6d2..000000000000
--- a/arch/openrisc/include/asm/dma-mapping.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * OpenRISC Linux
- *
- * Linux architectural port borrowing liberally from similar works of
- * others. All original copyrights apply as per the original source
- * declaration.
- *
- * OpenRISC implementation:
- * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#ifndef __ASM_OPENRISC_DMA_MAPPING_H
-#define __ASM_OPENRISC_DMA_MAPPING_H
-
-/*
- * See Documentation/DMA-API-HOWTO.txt and
- * Documentation/DMA-API.txt for documentation.
- */
-
-#include <linux/dma-debug.h>
-#include <linux/dma-mapping.h>
-
-extern const struct dma_map_ops or1k_dma_map_ops;
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
- return &or1k_dma_map_ops;
-}
-
-#endif /* __ASM_OPENRISC_DMA_MAPPING_H */
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index ec7fd45704d2..159336adfa2f 100644
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c
@@ -19,9 +19,7 @@
* the only thing implemented properly. The rest need looking into...
*/
-#include <linux/dma-mapping.h>
-#include <linux/dma-debug.h>
-#include <linux/export.h>
+#include <linux/dma-noncoherent.h>
#include <asm/cpuinfo.h>
#include <asm/spr_defs.h>
@@ -80,10 +78,9 @@ page_clear_nocache(pte_t *pte, unsigned long addr,
* is being ignored for now; uncached but write-combined memory is a
* missing feature of the OR1K.
*/
-static void *
-or1k_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)
{
unsigned long va;
void *page;
@@ -115,9 +112,9 @@ or1k_dma_alloc(struct device *dev, size_t size,
return (void *)va;
}
-static void
-or1k_dma_free(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, unsigned long attrs)
+void
+arch_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, unsigned long attrs)
{
unsigned long va = (unsigned long)vaddr;
struct mm_walk walk = {
@@ -133,19 +130,12 @@ or1k_dma_free(struct device *dev, size_t size, void *vaddr,
free_pages_exact(vaddr, size);
}
-static dma_addr_t
-or1k_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir,
- unsigned long attrs)
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t addr, size_t size,
+ enum dma_data_direction dir)
{
unsigned long cl;
- dma_addr_t addr = page_to_phys(page) + offset;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
- if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
- return addr;
-
switch (dir) {
case DMA_TO_DEVICE:
/* Flush the dcache for the requested range */
@@ -167,83 +157,4 @@ or1k_map_page(struct device *dev, struct page *page,
*/
break;
}
-
- return addr;
-}
-
-static void
-or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- /* Nothing special to do here... */
-}
-
-static int
-or1k_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i) {
- s->dma_address = or1k_map_page(dev, sg_page(s), s->offset,
- s->length, dir, 0);
- }
-
- return nents;
}
-
-static void
-or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i) {
- or1k_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, 0);
- }
-}
-
-static void
-or1k_sync_single_for_cpu(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction dir)
-{
- unsigned long cl;
- dma_addr_t addr = dma_handle;
- struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
-
- /* Invalidate the dcache for the requested range */
- for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)
- mtspr(SPR_DCBIR, cl);
-}
-
-static void
-or1k_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction dir)
-{
- unsigned long cl;
- dma_addr_t addr = dma_handle;
- struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
-
- /* Flush the dcache for the requested range */
- for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)
- mtspr(SPR_DCBFR, cl);
-}
-
-const struct dma_map_ops or1k_dma_map_ops = {
- .alloc = or1k_dma_alloc,
- .free = or1k_dma_free,
- .map_page = or1k_map_page,
- .unmap_page = or1k_unmap_page,
- .map_sg = or1k_map_sg,
- .unmap_sg = or1k_unmap_sg,
- .sync_single_for_cpu = or1k_sync_single_for_cpu,
- .sync_single_for_device = or1k_sync_single_for_device,
-};
-EXPORT_SYMBOL(or1k_dma_map_ops);