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>

6 files changed, 112 insertions, 184 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 2e8589a6fd2f..2d3a69993858 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -16,6 +16,7 @@ config SUPERH
         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 69d56dd4c968..b9a8f18f35a2 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;
+}
+
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
 
-#define dma_supported(dev, mask)        (1)
+        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 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 #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_get_cache_alignment(void)
 
 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
-        return dma_addr == 0;
-}
+        struct dma_map_ops *ops = get_dma_ops(dev);
 
-#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
+        if (ops->mapping_error)
+                return ops->mapping_error(dev, dma_addr);
 
-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);
+        return dma_addr == 0;
+}
 
-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 4163950cd1c6..6bf276b4f85d 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 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
  * 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 6fe0fcdaf531..097ae5ceb0e3 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -11,7 +11,8 @@ endif
 
 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 000000000000..e88fcebf860c
--- /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 9a8403d9344b..1165161e472c 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);