[MIPS] Make I/O helpers more customizable

    
1. Move ioswab*() and __mem_ioswab*() to mangle-port.h.  This gets rid
   of CONFIG_SGI_IP22 from include/asm-mips/io.h.
    
2. Pass a virtual address to *ioswab*().  Then we can provide
   mach-specific *ioswab*() and can do every evil thing based on its
   argument.  It could be useful on machines which have regions with
   different endian conversion scheme.
    
3. Call __swizzle_addr*() _after_ adding mips_io_port_base.  This
   unifies the meaning of the argument of __swizzle_addr*() (always
   virtual address).  Then mach-specific __swizzle_addr*() can do every
   evil thing based on the argument.
    
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 12 insertions, 57 deletions

diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index ba1d7bbc15d..546a17e56a9 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -40,56 +40,13 @@
  * hardware.  An example use would be for flash memory that's used for
  * execute in place.
  */
-# define __raw_ioswabb(x)	(x)
-# define __raw_ioswabw(x)	(x)
-# define __raw_ioswabl(x)	(x)
-# define __raw_ioswabq(x)	(x)
-# define ____raw_ioswabq(x)	(x)
+# define __raw_ioswabb(a,x)	(x)
+# define __raw_ioswabw(a,x)	(x)
+# define __raw_ioswabl(a,x)	(x)
+# define __raw_ioswabq(a,x)	(x)
+# define ____raw_ioswabq(a,x)	(x)
 
-/*
- * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
- * less sane hardware forces software to fiddle with this...
- *
- * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
- * you can't have the numerical value of data and byte addresses within
- * multibyte quantities both preserved at the same time.  Hence two
- * variations of functions: non-prefixed ones that preserve the value
- * and prefixed ones that preserve byte addresses.  The latters are
- * typically used for moving raw data between a peripheral and memory (cf.
- * string I/O functions), hence the "__mem_" prefix.
- */
-#if defined(CONFIG_SWAP_IO_SPACE)
-
-# define ioswabb(x)		(x)
-# define __mem_ioswabb(x)	(x)
-# ifdef CONFIG_SGI_IP22
-/*
- * IP22 seems braindead enough to swap 16bits values in hardware, but
- * not 32bits.  Go figure... Can't tell without documentation.
- */
-#  define ioswabw(x)		(x)
-#  define __mem_ioswabw(x)	le16_to_cpu(x)
-# else
-#  define ioswabw(x)		le16_to_cpu(x)
-#  define __mem_ioswabw(x)	(x)
-# endif
-# define ioswabl(x)		le32_to_cpu(x)
-# define __mem_ioswabl(x)	(x)
-# define ioswabq(x)		le64_to_cpu(x)
-# define __mem_ioswabq(x)	(x)
-
-#else
-
-# define ioswabb(x)		(x)
-# define __mem_ioswabb(x)	(x)
-# define ioswabw(x)		(x)
-# define __mem_ioswabw(x)	cpu_to_le16(x)
-# define ioswabl(x)		(x)
-# define __mem_ioswabl(x)	cpu_to_le32(x)
-# define ioswabq(x)		(x)
-# define __mem_ioswabq(x)	cpu_to_le32(x)
-
-#endif
+/* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
 
 #define IO_SPACE_LIMIT 0xffff
 
@@ -346,7 +303,7 @@ static inline void pfx##write##bwlq(type val,				\
 									\
 	__mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));	\
 									\
-	__val = pfx##ioswab##bwlq(val);					\
+	__val = pfx##ioswab##bwlq(__mem, val);				\
 									\
 	if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long))	\
 		*__mem = __val;						\
@@ -401,7 +358,7 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem)	\
 		BUG();							\
 	}								\
 									\
-	return pfx##ioswab##bwlq(__val);				\
+	return pfx##ioswab##bwlq(__mem, __val);				\
 }
 
 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)			\
@@ -411,10 +368,9 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
 	volatile type *__addr;						\
 	type __val;							\
 									\
-	port = __swizzle_addr_##bwlq(port);				\
-	__addr = (void *)(mips_io_port_base + port);			\
+	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
 									\
-	__val = pfx##ioswab##bwlq(val);					\
+	__val = pfx##ioswab##bwlq(__addr, val);				\
 									\
 	/* Really, we want this to be atomic */				\
 	BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));		\
@@ -428,15 +384,14 @@ static inline type pfx##in##bwlq##p(unsigned long port)			\
 	volatile type *__addr;						\
 	type __val;							\
 									\
-	port = __swizzle_addr_##bwlq(port);				\
-	__addr = (void *)(mips_io_port_base + port);			\
+	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
 									\
 	BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));		\
 									\
 	__val = *__addr;						\
 	slow;								\
 									\
-	return pfx##ioswab##bwlq(__val);				\
+	return pfx##ioswab##bwlq(__addr, __val);			\
 }
 
 #define __BUILD_MEMORY_PFX(bus, bwlq, type)				\