arch/mips/include/asm/mach-cavium-octeon/mangle-port.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003, 2004 Ralf Baechle
   7  */
   8 #ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
   9 #define __ASM_MACH_GENERIC_MANGLE_PORT_H
  10
  11 #include <asm/byteorder.h>
  12
  13 #ifdef __BIG_ENDIAN
  14
  15 # define __swizzle_addr_b(port) (port)
  16 # define __swizzle_addr_w(port) (port)
  17 # define __swizzle_addr_l(port) (port)
  18 # define __swizzle_addr_q(port) (port)
  19
  20 #else /* __LITTLE_ENDIAN */
  21
  22 static inline bool __should_swizzle_addr(unsigned long p)
  23 {
  24         /* boot bus? */
  25         return ((p >> 40) & 0xff) == 0;
  26 }
  27
  28 # define __swizzle_addr_b(port) \
  29         (__should_swizzle_addr(port) ? (port) ^ 7 : (port))
  30 # define __swizzle_addr_w(port) \
  31         (__should_swizzle_addr(port) ? (port) ^ 6 : (port))
  32 # define __swizzle_addr_l(port) \
  33         (__should_swizzle_addr(port) ? (port) ^ 4 : (port))
  34 # define __swizzle_addr_q(port) (port)
  35
  36 #endif /* __BIG_ENDIAN */
  37
  38 /*
  39  * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
  40  * less sane hardware forces software to fiddle with this...
  41  *
  42  * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
  43  * you can't have the numerical value of data and byte addresses within
  44  * multibyte quantities both preserved at the same time.  Hence two
  45  * variations of functions: non-prefixed ones that preserve the value
  46  * and prefixed ones that preserve byte addresses.  The latters are
  47  * typically used for moving raw data between a peripheral and memory (cf.
  48  * string I/O functions), hence the "__mem_" prefix.
  49  */
  50 #if defined(CONFIG_SWAP_IO_SPACE)
  51
  52 # define ioswabb(a, x)          (x)
  53 # define __mem_ioswabb(a, x)    (x)
  54 # define ioswabw(a, x)          le16_to_cpu(x)
  55 # define __mem_ioswabw(a, x)    (x)
  56 # define ioswabl(a, x)          le32_to_cpu(x)
  57 # define __mem_ioswabl(a, x)    (x)
  58 # define ioswabq(a, x)          le64_to_cpu(x)
  59 # define __mem_ioswabq(a, x)    (x)
  60
  61 #else
  62
  63 # define ioswabb(a, x)          (x)
  64 # define __mem_ioswabb(a, x)    (x)
  65 # define ioswabw(a, x)          (x)
  66 # define __mem_ioswabw(a, x)    cpu_to_le16(x)
  67 # define ioswabl(a, x)          (x)
  68 # define __mem_ioswabl(a, x)    cpu_to_le32(x)
  69 # define ioswabq(a, x)          (x)
  70 # define __mem_ioswabq(a, x)    cpu_to_le32(x)
  71
  72 #endif
  73
  74 #endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */