MIPS: Convert DMA to use dma-mapping-common.h

Use asm-generic/dma-mapping-common.h to handle all DMA mapping operations
and establish a default get_dma_ops() that forwards all operations to the
existing code.

Augment dev_archdata to carry a pointer to the struct dma_map_ops, allowing
DMA operations to be overridden on a per device basis.  Currently this is
never filled in, so the default dma_map_ops are used.  A follow-on patch
sets this for Octeon PCI devices.

Also initialize the dma_debug system as it is now used if it is configured.

Includes fixes by Kevin Cernekee <cernekee@gmail.com>.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1637/
Patchwork: http://patchwork.linux-mips.org/patch/1678/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

8 files changed, 136 insertions, 153 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4d4744f07e5..535a08ad69b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -14,6 +14,8 @@ config MIPS
         select HAVE_KRETPROBES
         select RTC_LIB if !MACH_LOONGSON
         select GENERIC_ATOMIC64 if !64BIT
+        select HAVE_DMA_ATTRS
+        select HAVE_DMA_API_DEBUG
 
 menu "Machine selection"
 
diff --git a/arch/mips/include/asm/device.h b/arch/mips/include/asm/device.h
index 06746c5e809..c94fafba9e6 100644
--- a/arch/mips/include/asm/device.h
+++ b/arch/mips/include/asm/device.h
@@ -3,4 +3,17 @@
  *
  * This file is released under the GPLv2
  */
-#include <asm-generic/device.h>
+#ifndef _ASM_MIPS_DEVICE_H
+#define _ASM_MIPS_DEVICE_H
+
+struct dma_map_ops;
+
+struct dev_archdata {
+        /* DMA operations on that device */
+        struct dma_map_ops *dma_ops;
+};
+
+struct pdev_archdata {
+};
+
+#endif /* _ASM_MIPS_DEVICE_H*/
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 18fbf7af8e9..655f849bd08 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -5,51 +5,41 @@
 #include <asm/cache.h>
 #include <asm-generic/dma-coherent.h>
 
-void *dma_alloc_noncoherent(struct device *dev, size_t size,
-                           dma_addr_t *dma_handle, gfp_t flag);
+#include <dma-coherence.h>
 
-void dma_free_noncoherent(struct device *dev, size_t size,
-                         void *vaddr, dma_addr_t dma_handle);
+extern struct dma_map_ops *mips_dma_map_ops;
 
-void *dma_alloc_coherent(struct device *dev, size_t size,
-                           dma_addr_t *dma_handle, gfp_t flag);
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+        if (dev && dev->archdata.dma_ops)
+                return dev->archdata.dma_ops;
+        else
+                return mips_dma_map_ops;
+}
 
-void dma_free_coherent(struct device *dev, size_t size,
-                         void *vaddr, dma_addr_t dma_handle);
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+        if (!dev->dma_mask)
+                return 0;
 
-extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
-        enum dma_data_direction direction);
-extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-        size_t size, enum dma_data_direction direction);
-extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-        enum dma_data_direction direction);
-extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
-        unsigned long offset, size_t size, enum dma_data_direction direction);
-
-static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-        size_t size, enum dma_data_direction direction)
+        return addr + size <= *dev->dma_mask;
+}
+
+static inline void dma_mark_clean(void *addr, size_t size) {}
+
+#include <asm-generic/dma-mapping-common.h>
+
+static inline int dma_supported(struct device *dev, u64 mask)
 {
-        dma_unmap_single(dev, dma_address, size, direction);
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        return ops->dma_supported(dev, mask);
 }
 
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-        int nhwentries, enum dma_data_direction direction);
-extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-        size_t size, enum dma_data_direction direction);
-extern void dma_sync_single_for_device(struct device *dev,
-        dma_addr_t dma_handle, size_t size, enum dma_data_direction direction);
-extern 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);
-extern 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);
-extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
-        int nelems, enum dma_data_direction direction);
-extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
-        int nelems, enum dma_data_direction direction);
-extern int dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
-extern int dma_supported(struct device *dev, u64 mask);
+static inline int dma_mapping_error(struct device *dev, u64 mask)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+        return ops->mapping_error(dev, mask);
+}
 
 static inline int
 dma_set_mask(struct device *dev, u64 mask)
@@ -65,4 +55,34 @@ dma_set_mask(struct device *dev, u64 mask)
 extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                enum dma_data_direction direction);
 
+static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+                                       dma_addr_t *dma_handle, gfp_t gfp)
+{
+        void *ret;
+        struct dma_map_ops *ops = get_dma_ops(dev);
+
+        ret = ops->alloc_coherent(dev, size, dma_handle, gfp);
+
+        debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
+
+        return ret;
+}
+
+static inline void dma_free_coherent(struct device *dev, size_t size,
+                                     void *vaddr, dma_addr_t dma_handle)
+{
+        struct dma_map_ops *ops = get_dma_ops(dev);
+
+        ops->free_coherent(dev, size, vaddr, dma_handle);
+
+        debug_dma_free_coherent(dev, size, vaddr, dma_handle);
+}
+
+
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                           dma_addr_t *dma_handle, gfp_t flag);
+
+void dma_free_noncoherent(struct device *dev, size_t size,
+                         void *vaddr, dma_addr_t dma_handle);
+
 #endif /* _ASM_DMA_MAPPING_H */
diff --git a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
index 17d579471ec..f768f6fe712 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
@@ -27,7 +27,7 @@ static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
         struct page *page)
 {
-        return octeon_map_dma_mem(dev, page_address(page), PAGE_SIZE);
+        BUG();
 }
 
 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
diff --git a/arch/mips/include/asm/mach-ip27/dma-coherence.h b/arch/mips/include/asm/mach-ip27/dma-coherence.h
index 7aa5ef9c19b..016d0989b14 100644
--- a/arch/mips/include/asm/mach-ip27/dma-coherence.h
+++ b/arch/mips/include/asm/mach-ip27/dma-coherence.h
@@ -26,7 +26,8 @@ static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
         return pa;
 }
 
-static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
+        struct page *page)
 {
         dma_addr_t pa = dev_to_baddr(dev, page_to_phys(page));
 
diff --git a/arch/mips/include/asm/mach-ip32/dma-coherence.h b/arch/mips/include/asm/mach-ip32/dma-coherence.h
index 55123fc0b2f..c8fb5aacf50 100644
--- a/arch/mips/include/asm/mach-ip32/dma-coherence.h
+++ b/arch/mips/include/asm/mach-ip32/dma-coherence.h
@@ -37,7 +37,8 @@ static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
         return pa;
 }
 
-static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
+        struct page *page)
 {
         dma_addr_t pa;
 
diff --git a/arch/mips/include/asm/mach-jazz/dma-coherence.h b/arch/mips/include/asm/mach-jazz/dma-coherence.h
index 2a10920473e..302101b54ac 100644
--- a/arch/mips/include/asm/mach-jazz/dma-coherence.h
+++ b/arch/mips/include/asm/mach-jazz/dma-coherence.h
@@ -17,7 +17,8 @@ static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t
         return vdma_alloc(virt_to_phys(addr), size);
 }
 
-static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, struct page *page)
+static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
+        struct page *page)
 {
         return vdma_alloc(page_to_phys(page), PAGE_SIZE);
 }
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index 469d4019f79..4fc1a0fbe00 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -95,10 +95,9 @@ void *dma_alloc_noncoherent(struct device *dev, size_t size,
 
         return ret;
 }
-
 EXPORT_SYMBOL(dma_alloc_noncoherent);
 
-void *dma_alloc_coherent(struct device *dev, size_t size,
+static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
         dma_addr_t * dma_handle, gfp_t gfp)
 {
         void *ret;
@@ -123,7 +122,6 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
         return ret;
 }
 
-EXPORT_SYMBOL(dma_alloc_coherent);
 
 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
         dma_addr_t dma_handle)
@@ -131,10 +129,9 @@ void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
         plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
         free_pages((unsigned long) vaddr, get_order(size));
 }
-
 EXPORT_SYMBOL(dma_free_noncoherent);
 
-void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
         dma_addr_t dma_handle)
 {
         unsigned long addr = (unsigned long) vaddr;
@@ -151,8 +148,6 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
         free_pages(addr, get_order(size));
 }
 
-EXPORT_SYMBOL(dma_free_coherent);
-
 static inline void __dma_sync(unsigned long addr, size_t size,
         enum dma_data_direction direction)
 {
@@ -174,21 +169,8 @@ static inline void __dma_sync(unsigned long addr, size_t size,
         }
 }
 
-dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
-        enum dma_data_direction direction)
-{
-        unsigned long addr = (unsigned long) ptr;
-
-        if (!plat_device_is_coherent(dev))
-                __dma_sync(addr, size, direction);
-
-        return plat_map_dma_mem(dev, ptr, size);
-}
-
-EXPORT_SYMBOL(dma_map_single);
-
-void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
-        enum dma_data_direction direction)
+static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
+        size_t size, enum dma_data_direction direction, struct dma_attrs *attrs)
 {
         if (cpu_is_noncoherent_r10000(dev))
                 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
@@ -197,15 +179,11 @@ void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
         plat_unmap_dma_mem(dev, dma_addr, size, direction);
 }
 
-EXPORT_SYMBOL(dma_unmap_single);
-
-int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-        enum dma_data_direction direction)
+static int mips_dma_map_sg(struct device *dev, struct scatterlist *sg,
+        int nents, enum dma_data_direction direction, struct dma_attrs *attrs)
 {
         int i;
 
-        BUG_ON(direction == DMA_NONE);
-
         for (i = 0; i < nents; i++, sg++) {
                 unsigned long addr;
 
@@ -219,33 +197,27 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
         return nents;
 }
 
-EXPORT_SYMBOL(dma_map_sg);
-
-dma_addr_t dma_map_page(struct device *dev, struct page *page,
-        unsigned long offset, size_t size, enum dma_data_direction direction)
+static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page,
+        unsigned long offset, size_t size, enum dma_data_direction direction,
+        struct dma_attrs *attrs)
 {
-        BUG_ON(direction == DMA_NONE);
+        unsigned long addr;
 
-        if (!plat_device_is_coherent(dev)) {
-                unsigned long addr;
+        addr = (unsigned long) page_address(page) + offset;
 
-                addr = (unsigned long) page_address(page) + offset;
+        if (!plat_device_is_coherent(dev))
                 __dma_sync(addr, size, direction);
-        }
 
-        return plat_map_dma_mem_page(dev, page) + offset;
+        return plat_map_dma_mem(dev, (void *)addr, size);
 }
 
-EXPORT_SYMBOL(dma_map_page);
-
-void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
-        enum dma_data_direction direction)
+static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+        int nhwentries, enum dma_data_direction direction,
+        struct dma_attrs *attrs)
 {
         unsigned long addr;
         int i;
 
-        BUG_ON(direction == DMA_NONE);
-
         for (i = 0; i < nhwentries; i++, sg++) {
                 if (!plat_device_is_coherent(dev) &&
                     direction != DMA_TO_DEVICE) {
@@ -257,13 +229,9 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
         }
 }
 
-EXPORT_SYMBOL(dma_unmap_sg);
-
-void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-        size_t size, enum dma_data_direction direction)
+static void mips_dma_sync_single_for_cpu(struct device *dev,
+        dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 {
-        BUG_ON(direction == DMA_NONE);
-
         if (cpu_is_noncoherent_r10000(dev)) {
                 unsigned long addr;
 
@@ -272,13 +240,9 @@ void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
         }
 }
 
-EXPORT_SYMBOL(dma_sync_single_for_cpu);
-
-void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
-        size_t size, enum dma_data_direction direction)
+static void mips_dma_sync_single_for_device(struct device *dev,
+        dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 {
-        BUG_ON(direction == DMA_NONE);
-
         plat_extra_sync_for_device(dev);
         if (!plat_device_is_coherent(dev)) {
                 unsigned long addr;
@@ -288,46 +252,11 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
         }
 }
 
-EXPORT_SYMBOL(dma_sync_single_for_device);
-
-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)
-{
-        BUG_ON(direction == DMA_NONE);
-
-        if (cpu_is_noncoherent_r10000(dev)) {
-                unsigned long addr;
-
-                addr = dma_addr_to_virt(dev, dma_handle);
-                __dma_sync(addr + offset, size, direction);
-        }
-}
-
-EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
-
-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)
-{
-        BUG_ON(direction == DMA_NONE);
-
-        plat_extra_sync_for_device(dev);
-        if (!plat_device_is_coherent(dev)) {
-                unsigned long addr;
-
-                addr = dma_addr_to_virt(dev, dma_handle);
-                __dma_sync(addr + offset, size, direction);
-        }
-}
-
-EXPORT_SYMBOL(dma_sync_single_range_for_device);
-
-void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
-        enum dma_data_direction direction)
+static void mips_dma_sync_sg_for_cpu(struct device *dev,
+        struct scatterlist *sg, int nelems, enum dma_data_direction direction)
 {
         int i;
 
-        BUG_ON(direction == DMA_NONE);
-
         /* Make sure that gcc doesn't leave the empty loop body.  */
         for (i = 0; i < nelems; i++, sg++) {
                 if (cpu_is_noncoherent_r10000(dev))
@@ -336,15 +265,11 @@ void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
         }
 }
 
-EXPORT_SYMBOL(dma_sync_sg_for_cpu);
-
-void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
-        enum dma_data_direction direction)
+static void mips_dma_sync_sg_for_device(struct device *dev,
+        struct scatterlist *sg, int nelems, enum dma_data_direction direction)
 {
         int i;
 
-        BUG_ON(direction == DMA_NONE);
-
         /* Make sure that gcc doesn't leave the empty loop body.  */
         for (i = 0; i < nelems; i++, sg++) {
                 if (!plat_device_is_coherent(dev))
@@ -353,24 +278,18 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nele
         }
 }
 
-EXPORT_SYMBOL(dma_sync_sg_for_device);
-
-int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
         return plat_dma_mapping_error(dev, dma_addr);
 }
 
-EXPORT_SYMBOL(dma_mapping_error);
-
-int dma_supported(struct device *dev, u64 mask)
+int mips_dma_supported(struct device *dev, u64 mask)
 {
         return plat_dma_supported(dev, mask);
 }
 
-EXPORT_SYMBOL(dma_supported);
-
-void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
-               enum dma_data_direction direction)
+void mips_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+                         enum dma_data_direction direction)
 {
         BUG_ON(direction == DMA_NONE);
 
@@ -379,4 +298,30 @@ void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                 __dma_sync((unsigned long)vaddr, size, direction);
 }
 
-EXPORT_SYMBOL(dma_cache_sync);
+static struct dma_map_ops mips_default_dma_map_ops = {
+        .alloc_coherent = mips_dma_alloc_coherent,
+        .free_coherent = mips_dma_free_coherent,
+        .map_page = mips_dma_map_page,
+        .unmap_page = mips_dma_unmap_page,
+        .map_sg = mips_dma_map_sg,
+        .unmap_sg = mips_dma_unmap_sg,
+        .sync_single_for_cpu = mips_dma_sync_single_for_cpu,
+        .sync_single_for_device = mips_dma_sync_single_for_device,
+        .sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
+        .sync_sg_for_device = mips_dma_sync_sg_for_device,
+        .mapping_error = mips_dma_mapping_error,
+        .dma_supported = mips_dma_supported
+};
+
+struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
+EXPORT_SYMBOL(mips_dma_map_ops);
+
+#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
+
+static int __init mips_dma_init(void)
+{
+        dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+
+        return 0;
+}
+fs_initcall(mips_dma_init);