Remove dma_cache_(wback|inv|wback_inv) functions

dma_cache_(wback|inv|wback_inv) were the earliest attempt on a generalized
cache managment API for I/O purposes.  Originally it was basically the raw
MIPS low level cache API exported to the entire world.  The API has
suffered from a lack of documentation, was not very widely used unlike it's
more modern brothers and can easily be replaced by dma_cache_sync.  So
remove it rsp.  turn the surviving bits back into an arch private API, as
discussed on linux-arch.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Kyle McMartin <kyle@parisc-linux.org>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

19 files changed, 9 insertions, 182 deletions

diff --git a/include/asm-alpha/io.h b/include/asm-alpha/io.h
index ab5b60dcef19..38f18cf18c9d 100644
--- a/include/asm-alpha/io.h
+++ b/include/asm-alpha/io.h
@@ -551,12 +551,6 @@ extern void outsl (unsigned long port, const void *src, unsigned long count);
 #endif
 #define RTC_ALWAYS_BCD  0
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 /*
  * Some mucking forons use if[n]def writeq to check if platform has it.
  * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
diff --git a/include/asm-avr32/io.h b/include/asm-avr32/io.h
index 64bb92bb6773..8be7ea9c9047 100644
--- a/include/asm-avr32/io.h
+++ b/include/asm-avr32/io.h
@@ -298,13 +298,6 @@ extern void __iounmap(void __iomem *addr);
 #define ioport_map(port, nr)    ioremap(port, nr)
 #define ioport_unmap(port)      iounmap(port)
 
-#define dma_cache_wback_inv(_start, _size)      \
-        flush_dcache_region(_start, _size)
-#define dma_cache_inv(_start, _size)            \
-        invalidate_dcache_region(_start, _size)
-#define dma_cache_wback(_start, _size)          \
-        clean_dcache_region(_start, _size)
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/include/asm-blackfin/io.h b/include/asm-blackfin/io.h
index 525179bf43d7..d1d2e6be3b59 100644
--- a/include/asm-blackfin/io.h
+++ b/include/asm-blackfin/io.h
@@ -183,10 +183,6 @@ extern void blkfin_inv_cache_all(void);
 #define ioport_map(port, nr)            ((void __iomem*)(port))
 #define ioport_unmap(addr)
 
-#define dma_cache_inv(_start,_size) do { blkfin_inv_cache_all();} while (0)
-#define dma_cache_wback(_start,_size) do { } while (0)
-#define dma_cache_wback_inv(_start,_size) do { blkfin_inv_cache_all();} while (0)
-
 /* Pages to physical address... */
 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
diff --git a/include/asm-h8300/io.h b/include/asm-h8300/io.h
index 91b7487cb7ae..7543a57b4ea1 100644
--- a/include/asm-h8300/io.h
+++ b/include/asm-h8300/io.h
@@ -264,12 +264,6 @@ static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size
 
 extern void iounmap(void *addr);
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 /* H8/300 internal I/O functions */
 static __inline__ unsigned char ctrl_inb(unsigned long addr)
 {
diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h
index eb17a8692967..4ebed77aa472 100644
--- a/include/asm-ia64/io.h
+++ b/include/asm-ia64/io.h
@@ -435,10 +435,6 @@ extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
 extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
 extern void memset_io(volatile void __iomem *s, int c, long n);
 
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 # endif /* __KERNEL__ */
 
 /*
diff --git a/include/asm-m68k/io.h b/include/asm-m68k/io.h
index 47bb9cf107b7..baf4f9b8acfc 100644
--- a/include/asm-m68k/io.h
+++ b/include/asm-m68k/io.h
@@ -384,12 +384,6 @@ static inline void __iomem *ioremap_fullcache(unsigned long physaddr,
         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 }
 
-
-/* m68k caches aren't DMA coherent */
-extern void dma_cache_wback_inv(unsigned long start, unsigned long size);
-extern void dma_cache_wback(unsigned long start, unsigned long size);
-extern void dma_cache_inv(unsigned long start, unsigned long size);
-
 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 {
         __builtin_memset((void __force *) addr, val, count);
diff --git a/include/asm-m68knommu/io.h b/include/asm-m68knommu/io.h
index 8df4cee2a0cd..653d9b2d7ddf 100644
--- a/include/asm-m68knommu/io.h
+++ b/include/asm-m68knommu/io.h
@@ -165,12 +165,6 @@ static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size
 
 extern void iounmap(void *addr);
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 /* Pages to physical address... */
 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index 2cd8323c8586..e62058b0d28c 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -554,6 +554,8 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int
  *    caches.  Dirty lines of the caches may be written back or simply
  *    be discarded.  This operation is necessary before dma operations
  *    to the memory.
+ *
+ * This API used to be exported; it now is for arch code internal use only.
  */
 #ifdef CONFIG_DMA_NONCOHERENT
 
diff --git a/include/asm-parisc/io.h b/include/asm-parisc/io.h
index 4cc9bcec0564..95f00e11c7b4 100644
--- a/include/asm-parisc/io.h
+++ b/include/asm-parisc/io.h
@@ -270,11 +270,6 @@ extern void outsl (unsigned long port, const void *src, unsigned long count);
 /* IO Port space is :      BBiiii   where BB is HBA number. */
 #define IO_SPACE_LIMIT 0x00ffffff
 
-
-#define dma_cache_inv(_start,_size)             do { flush_kernel_dcache_range(_start,_size); } while (0)
-#define dma_cache_wback(_start,_size)           do { flush_kernel_dcache_range(_start,_size); } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { flush_kernel_dcache_range(_start,_size); } while (0)
-
 /* PA machines have an MM I/O space from 0xf0000000-0xffffffff in 32
  * bit mode and from 0xfffffffff0000000-0xfffffffffffffff in 64 bit
  * mode (essentially just sign extending.  This macro takes in a 32
diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 0d0589ef8ea6..bf14ab4ef4c9 100644
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -498,23 +498,6 @@ static inline void name at					\
 #define writeq  writeq
 #endif
 
-#ifdef CONFIG_NOT_COHERENT_CACHE
-
-#define dma_cache_inv(_start,_size) \
-        invalidate_dcache_range(_start, (_start + _size))
-#define dma_cache_wback(_start,_size) \
-        clean_dcache_range(_start, (_start + _size))
-#define dma_cache_wback_inv(_start,_size) \
-        flush_dcache_range(_start, (_start + _size))
-
-#else /* CONFIG_NOT_COHERENT_CACHE */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
-#endif /* !CONFIG_NOT_COHERENT_CACHE */
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/include/asm-ppc/io.h b/include/asm-ppc/io.h
index 8f58231a8bc6..a0d409a5d80f 100644
--- a/include/asm-ppc/io.h
+++ b/include/asm-ppc/io.h
@@ -478,23 +478,6 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 #include <asm/mpc8260_pci9.h>
 #endif
 
-#ifdef CONFIG_NOT_COHERENT_CACHE
-
-#define dma_cache_inv(_start,_size) \
-        invalidate_dcache_range(_start, (_start + _size))
-#define dma_cache_wback(_start,_size) \
-        clean_dcache_range(_start, (_start + _size))
-#define dma_cache_wback_inv(_start,_size) \
-        flush_dcache_range(_start, (_start + _size))
-
-#else
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
-#endif
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/include/asm-sh/floppy.h b/include/asm-sh/floppy.h
index 942ade98757b..59fbfdc90dfb 100644
--- a/include/asm-sh/floppy.h
+++ b/include/asm-sh/floppy.h
@@ -213,7 +213,7 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
         }
 #endif
 
-        dma_cache_wback_inv(addr, size);
+        __flush_purge_region(addr, size);
 
         /* actual, physical DMA */
         doing_pdma = 0;
diff --git a/include/asm-sh/io.h b/include/asm-sh/io.h
index 1a336cdc75fe..6ed34d8eac5f 100644
--- a/include/asm-sh/io.h
+++ b/include/asm-sh/io.h
@@ -327,31 +327,6 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
         __iounmap((addr))
 
 /*
- * The caches on some architectures aren't dma-coherent and have need to
- * handle this in software.  There are three types of operations that
- * can be applied to dma buffers.
- *
- *  - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
- *    writing the content of the caches back to memory, if necessary.
- *    The function also invalidates the affected part of the caches as
- *    necessary before DMA transfers from outside to memory.
- *  - dma_cache_inv(start, size) invalidates the affected parts of the
- *    caches.  Dirty lines of the caches may be written back or simply
- *    be discarded.  This operation is necessary before dma operations
- *    to the memory.
- *  - dma_cache_wback(start, size) writes back any dirty lines but does
- *    not invalidate the cache.  This can be used before DMA reads from
- *    memory,
- */
-
-#define dma_cache_wback_inv(_start,_size) \
-    __flush_purge_region(_start,_size)
-#define dma_cache_inv(_start,_size) \
-    __flush_invalidate_region(_start,_size)
-#define dma_cache_wback(_start,_size) \
-    __flush_wback_region(_start,_size)
-
-/*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
  */
diff --git a/include/asm-sh64/dma-mapping.h b/include/asm-sh64/dma-mapping.h
index de4309960207..e661857f98dc 100644
--- a/include/asm-sh64/dma-mapping.h
+++ b/include/asm-sh64/dma-mapping.h
@@ -42,7 +42,11 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                                   enum dma_data_direction dir)
 {
-        dma_cache_wback_inv((unsigned long)vaddr, size);
+        unsigned long s = (unsigned long) vaddr & L1_CACHE_ALIGN_MASK;
+        unsigned long e = (vaddr + size) & L1_CACHE_ALIGN_MASK;
+
+        for (; s <= e; s += L1_CACHE_BYTES)
+                asm volatile ("ocbp     %0, 0" : : "r" (s));
 }
 
 static inline dma_addr_t dma_map_single(struct device *dev,
diff --git a/include/asm-sh64/io.h b/include/asm-sh64/io.h
index 3de3ad99f457..7bd7314d38c2 100644
--- a/include/asm-sh64/io.h
+++ b/include/asm-sh64/io.h
@@ -182,54 +182,6 @@ unsigned long onchip_remap(unsigned long addr, unsigned long size, const char* n
 extern void onchip_unmap(unsigned long vaddr);
 
 /*
- * The caches on some architectures aren't dma-coherent and have need to
- * handle this in software.  There are three types of operations that
- * can be applied to dma buffers.
- *
- *  - dma_cache_wback_inv(start, size) makes caches and RAM coherent by
- *    writing the content of the caches back to memory, if necessary.
- *    The function also invalidates the affected part of the caches as
- *    necessary before DMA transfers from outside to memory.
- *  - dma_cache_inv(start, size) invalidates the affected parts of the
- *    caches.  Dirty lines of the caches may be written back or simply
- *    be discarded.  This operation is necessary before dma operations
- *    to the memory.
- *  - dma_cache_wback(start, size) writes back any dirty lines but does
- *    not invalidate the cache.  This can be used before DMA reads from
- *    memory,
- */
-
-static __inline__ void dma_cache_wback_inv (unsigned long start, unsigned long size)
-{
-        unsigned long s = start & L1_CACHE_ALIGN_MASK;
-        unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
-
-        for (; s <= e; s += L1_CACHE_BYTES)
-                asm volatile ("ocbp     %0, 0" : : "r" (s));
-}
-
-static __inline__ void dma_cache_inv (unsigned long start, unsigned long size)
-{
-        // Note that caller has to be careful with overzealous
-        // invalidation should there be partial cache lines at the extremities
-        // of the specified range
-        unsigned long s = start & L1_CACHE_ALIGN_MASK;
-        unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
-
-        for (; s <= e; s += L1_CACHE_BYTES)
-                asm volatile ("ocbi     %0, 0" : : "r" (s));
-}
-
-static __inline__ void dma_cache_wback (unsigned long start, unsigned long size)
-{
-        unsigned long s = start & L1_CACHE_ALIGN_MASK;
-        unsigned long e = (start + size) & L1_CACHE_ALIGN_MASK;
-
-        for (; s <= e; s += L1_CACHE_BYTES)
-                asm volatile ("ocbwb    %0, 0" : : "r" (s));
-}
-
-/*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
  */
diff --git a/include/asm-sparc/io.h b/include/asm-sparc/io.h
index c23e74a0eaa8..243bf8e9a058 100644
--- a/include/asm-sparc/io.h
+++ b/include/asm-sparc/io.h
@@ -310,13 +310,6 @@ extern void sbus_iounmap(volatile void __iomem *vaddr, unsigned long size);
 #define RTC_PORT(x)   (rtc_port + (x))
 #define RTC_ALWAYS_BCD  0
 
-/* Nothing to do */
-/* P3: Only IDE DMA may need these. XXX Verify that it still does... */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 #endif
 
 #define __ARCH_HAS_NO_PAGE_ZERO_MAPPED          1
diff --git a/include/asm-sparc64/io.h b/include/asm-sparc64/io.h
index 9565a892801e..cd7ef3097ac2 100644
--- a/include/asm-sparc64/io.h
+++ b/include/asm-sparc64/io.h
@@ -474,12 +474,6 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 #define sbus_iounmap(__addr, __size)    \
         release_region((unsigned long)(__addr), (__size))
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/include/asm-x86/io_32.h b/include/asm-x86/io_32.h
index e8e0bd641120..4ea7b1ad3c1d 100644
--- a/include/asm-x86/io_32.h
+++ b/include/asm-x86/io_32.h
@@ -237,18 +237,9 @@ static inline void flush_write_buffers(void)
         __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
 }
 
-#define dma_cache_inv(_start,_size)             flush_write_buffers()
-#define dma_cache_wback(_start,_size)           flush_write_buffers()
-#define dma_cache_wback_inv(_start,_size)       flush_write_buffers()
-
 #else
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-#define flush_write_buffers()
+#define flush_write_buffers() do { } while (0)
 
 #endif
 
diff --git a/include/asm-x86/io_64.h b/include/asm-x86/io_64.h
index 7475095c5061..a037b0794332 100644
--- a/include/asm-x86/io_64.h
+++ b/include/asm-x86/io_64.h
@@ -249,12 +249,6 @@ void memset_io(volatile void __iomem *a, int b, size_t c);
  */
 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 
-/* Nothing to do */
-
-#define dma_cache_inv(_start,_size)             do { } while (0)
-#define dma_cache_wback(_start,_size)           do { } while (0)
-#define dma_cache_wback_inv(_start,_size)       do { } while (0)
-
 #define flush_write_buffers() 
 
 extern int iommu_bio_merge;