From 25bc53dd002e6882a0fde6dadc135ee04f6f7065 Mon Sep 17 00:00:00 2001 From: Alex Smith Date: Thu, 15 May 2014 16:50:57 +0100 Subject: [PATCH 06/12] MIPS: octeon: Boot bus I/O address swizzling for little endian Signed-off-by: Alex Smith --- .../include/asm/mach-cavium-octeon/mangle-port.h | 73 ++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 arch/mips/include/asm/mach-cavium-octeon/mangle-port.h diff --git a/arch/mips/include/asm/mach-cavium-octeon/mangle-port.h b/arch/mips/include/asm/mach-cavium-octeon/mangle-port.h new file mode 100644 index 0000000..6e2964e --- /dev/null +++ b/arch/mips/include/asm/mach-cavium-octeon/mangle-port.h @@ -0,0 +1,73 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2003, 2004 Ralf Baechle + */ +#ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H +#define __ASM_MACH_GENERIC_MANGLE_PORT_H + +#include + +#ifdef __BIG_ENDIAN +#define __swizzle_addr_b(port) (port) +#define __swizzle_addr_w(port) (port) +#define __swizzle_addr_l(port) (port) +#define __swizzle_addr_q(port) (port) +#else /* __LITTLE_ENDIAN */ +static inline bool __should_swizzle_addr(unsigned long p) +{ + switch ((p >> 40) & 0xff) { + case 0: /* boot bus */ + return true; + default: + return false; + } +} +#define __swizzle_addr_b(port) \ + (__should_swizzle_addr(port) ? (port) ^ 7 : (port)) +#define __swizzle_addr_w(port) \ + (__should_swizzle_addr(port) ? (port) ^ 6 : (port)) +#define __swizzle_addr_l(port) \ + (__should_swizzle_addr(port) ? (port) ^ 4 : (port)) +#define __swizzle_addr_q(port) (port) +#endif /* __BIG_ENDIAN */ + +/* + * 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(a, x) (x) +# define __mem_ioswabb(a, x) (x) +# define ioswabw(a, x) le16_to_cpu(x) +# define __mem_ioswabw(a, x) (x) +# define ioswabl(a, x) le32_to_cpu(x) +# define __mem_ioswabl(a, x) (x) +# define ioswabq(a, x) le64_to_cpu(x) +# define __mem_ioswabq(a, x) (x) + +#else + +# define ioswabb(a, x) (x) +# define __mem_ioswabb(a, x) (x) +# define ioswabw(a, x) (x) +# define __mem_ioswabw(a, x) cpu_to_le16(x) +# define ioswabl(a, x) (x) +# define __mem_ioswabl(a, x) cpu_to_le32(x) +# define ioswabq(a, x) (x) +# define __mem_ioswabq(a, x) cpu_to_le32(x) + +#endif + +#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */ -- 2.1.0