sh: Convert to asm-generic/dma-mapping-common.h
This converts the old DMA mapping support to the new generic
dma-mapping-common.h abstraction.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2e8589a..2d3a699 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -16,6 +16,7 @@
select HAVE_IOREMAP_PROT if MMU
select HAVE_ARCH_TRACEHOOK
select HAVE_DMA_API_DEBUG
+ select HAVE_DMA_ATTRS
select HAVE_PERF_EVENTS
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_BZIP2
diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
index 69d56dd..b9a8f18 100644
--- a/arch/sh/include/asm/dma-mapping.h
+++ b/arch/sh/include/asm/dma-mapping.h
@@ -1,21 +1,32 @@
#ifndef __ASM_SH_DMA_MAPPING_H
#define __ASM_SH_DMA_MAPPING_H
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-debug.h>
-#include <asm/cacheflush.h>
-#include <asm/io.h>
-#include <asm-generic/dma-coherent.h>
+extern struct dma_map_ops *dma_ops;
+extern void no_iommu_init(void);
-extern struct bus_type pci_bus_type;
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+ return dma_ops;
+}
-#define dma_supported(dev, mask) (1)
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+ struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (ops->dma_supported)
+ return ops->dma_supported(dev, mask);
+
+ return 1;
+}
static inline int dma_set_mask(struct device *dev, u64 mask)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
+
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
+ if (ops->set_dma_mask)
+ return ops->set_dma_mask(dev, mask);
*dev->dma_mask = mask;
@@ -35,160 +46,6 @@
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#define dma_is_consistent(d, h) (1)
-static inline dma_addr_t dma_map_single(struct device *dev,
- void *ptr, size_t size,
- enum dma_data_direction dir)
-{
- dma_addr_t addr = virt_to_phys(ptr);
-
-#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
- if (dev->bus == &pci_bus_type)
- return addr;
-#endif
- dma_cache_sync(dev, ptr, size, dir);
-
- debug_dma_map_page(dev, virt_to_page(ptr),
- (unsigned long)ptr & ~PAGE_MASK, size,
- dir, addr, true);
-
- return addr;
-}
-
-static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
- size_t size, enum dma_data_direction dir)
-{
- debug_dma_unmap_page(dev, addr, size, dir, true);
-}
-
-static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- int i;
-
- for (i = 0; i < nents; i++) {
-#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
- dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
-#endif
- sg[i].dma_address = sg_phys(&sg[i]);
- sg[i].dma_length = sg[i].length;
- }
-
- debug_dma_map_sg(dev, sg, nents, i, dir);
-
- return nents;
-}
-
-static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- debug_dma_unmap_sg(dev, sg, nents, dir);
-}
-
-static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir)
-{
- return dma_map_single(dev, page_address(page) + offset, size, dir);
-}
-
-static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
- size_t size, enum dma_data_direction dir)
-{
- dma_unmap_single(dev, dma_address, size, dir);
-}
-
-static inline void __dma_sync_single(struct device *dev, dma_addr_t dma_handle,
- size_t size, enum dma_data_direction dir)
-{
-#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
- if (dev->bus == &pci_bus_type)
- return;
-#endif
- dma_cache_sync(dev, phys_to_virt(dma_handle), size, dir);
-}
-
-static inline void dma_sync_single_range(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset, size_t size,
- enum dma_data_direction dir)
-{
-#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
- if (dev->bus == &pci_bus_type)
- return;
-#endif
- dma_cache_sync(dev, phys_to_virt(dma_handle) + offset, size, dir);
-}
-
-static inline void __dma_sync_sg(struct device *dev, struct scatterlist *sg,
- int nelems, enum dma_data_direction dir)
-{
- int i;
-
- for (i = 0; i < nelems; i++) {
-#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
- dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
-#endif
- sg[i].dma_address = sg_phys(&sg[i]);
- sg[i].dma_length = sg[i].length;
- }
-}
-
-static inline void dma_sync_single_for_cpu(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction dir)
-{
- __dma_sync_single(dev, dma_handle, size, dir);
- debug_dma_sync_single_for_cpu(dev, dma_handle, size, dir);
-}
-
-static inline void dma_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle,
- size_t size,
- enum dma_data_direction dir)
-{
- __dma_sync_single(dev, dma_handle, size, dir);
- debug_dma_sync_single_for_device(dev, dma_handle, size, dir);
-}
-
-static inline void dma_sync_single_range_for_cpu(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset,
- size_t size,
- enum dma_data_direction direction)
-{
- dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
- debug_dma_sync_single_range_for_cpu(dev, dma_handle,
- offset, size, direction);
-}
-
-static inline void dma_sync_single_range_for_device(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset,
- size_t size,
- enum dma_data_direction direction)
-{
- dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
- debug_dma_sync_single_range_for_device(dev, dma_handle,
- offset, size, direction);
-}
-
-
-static inline void dma_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sg, int nelems,
- enum dma_data_direction dir)
-{
- __dma_sync_sg(dev, sg, nelems, dir);
- debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
-}
-
-static inline void dma_sync_sg_for_device(struct device *dev,
- struct scatterlist *sg, int nelems,
- enum dma_data_direction dir)
-{
- __dma_sync_sg(dev, sg, nelems, dir);
- debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
-}
-
static inline int dma_get_cache_alignment(void)
{
/*
@@ -200,20 +57,15 @@
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (ops->mapping_error)
+ return ops->mapping_error(dev, dma_addr);
+
return dma_addr == 0;
}
-#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
-
-extern int
-dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
- dma_addr_t device_addr, size_t size, int flags);
-
-extern void
-dma_release_declared_memory(struct device *dev);
-
-extern void *
-dma_mark_declared_memory_occupied(struct device *dev,
- dma_addr_t device_addr, size_t size);
+#include <asm-generic/dma-coherent.h>
+#include <asm-generic/dma-mapping-common.h>
#endif /* __ASM_SH_DMA_MAPPING_H */
diff --git a/arch/sh/include/asm/pci.h b/arch/sh/include/asm/pci.h
index 4163950..6bf276b 100644
--- a/arch/sh/include/asm/pci.h
+++ b/arch/sh/include/asm/pci.h
@@ -3,8 +3,6 @@
#ifdef __KERNEL__
-#include <linux/dma-mapping.h>
-
/* Can be used to override the logic in pci_scan_bus for skipping
already-configured bus numbers - to be used for buggy BIOSes
or architectures with incomplete PCI setup by the loader */
@@ -54,13 +52,7 @@
* address space. The networking and block device layers use
* this boolean for bounce buffer decisions.
*/
-#define PCI_DMA_BUS_IS_PHYS (1)
-
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <asm/scatterlist.h>
-#include <linux/string.h>
-#include <asm/io.h>
+#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
/* pci_unmap_{single,page} being a nop depends upon the
* configuration.
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index 6fe0fcd..097ae5c 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -11,7 +11,8 @@
CFLAGS_REMOVE_return_address.o = -pg
-obj-y := debugtraps.o dumpstack.o idle.o io.o io_generic.o irq.o \
+obj-y := debugtraps.o dma-nommu.o dumpstack.o \
+ idle.o io.o io_generic.o irq.o \
irq_$(BITS).o machvec.o nmi_debug.o process_$(BITS).o \
ptrace_$(BITS).o return_address.o \
setup.o signal_$(BITS).o sys_sh.o sys_sh$(BITS).o \
diff --git a/arch/sh/kernel/dma-nommu.c b/arch/sh/kernel/dma-nommu.c
new file mode 100644
index 0000000..e88fceb
--- /dev/null
+++ b/arch/sh/kernel/dma-nommu.c
@@ -0,0 +1,76 @@
+/*
+ * DMA mapping support for platforms lacking IOMMUs.
+ *
+ * Copyright (C) 2009 Paul Mundt
+ *
+ * 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/io.h>
+
+static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ dma_addr_t addr = page_to_phys(page) + offset;
+
+ WARN_ON(size == 0);
+ dma_cache_sync(dev, page_address(page) + offset, size, dir);
+
+ return addr;
+}
+
+static int nommu_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct scatterlist *s;
+ int i;
+
+ WARN_ON(nents == 0 || sg[0].length == 0);
+
+ for_each_sg(sg, s, nents, i) {
+ BUG_ON(!sg_page(s));
+
+ dma_cache_sync(dev, sg_virt(s), s->length, dir);
+
+ s->dma_address = sg_phys(s);
+ s->dma_length = s->length;
+ }
+
+ return nents;
+}
+
+static void nommu_sync_single(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir)
+{
+ dma_cache_sync(dev, phys_to_virt(addr), size, dir);
+}
+
+static void nommu_sync_sg(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction dir)
+{
+ struct scatterlist *s;
+ int i;
+
+ for_each_sg(sg, s, nelems, i)
+ dma_cache_sync(dev, sg_virt(s), s->length, dir);
+}
+
+struct dma_map_ops nommu_dma_ops = {
+ .map_page = nommu_map_page,
+ .map_sg = nommu_map_sg,
+ .sync_single_for_device = nommu_sync_single,
+ .sync_sg_for_device = nommu_sync_sg,
+ .is_phys = 1,
+};
+
+void __init no_iommu_init(void)
+{
+ if (dma_ops)
+ return;
+ dma_ops = &nommu_dma_ops;
+}
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index 9a8403d..1165161 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -15,14 +15,20 @@
#include <linux/dma-mapping.h>
#include <linux/dma-debug.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/addrspace.h>
#define PREALLOC_DMA_DEBUG_ENTRIES 4096
+struct dma_map_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
static int __init dma_init(void)
{
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+
+ no_iommu_init();
return 0;
}
fs_initcall(dma_init);
