[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 ba1d7bbc15d2..546a17e56a9b 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)                             \