MIPS: OCTEON: Add mach-cavium-octeon/mangle-port.h

Needed for little-endian ioport access.
This fixes NOR flash in little-endian mode

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9591/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 74 insertions, 0 deletions

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 000000000000..374eefafb320
--- /dev/null
+++ b/arch/mips/include/asm/mach-cavium-octeon/mangle-port.h
@@ -0,0 +1,74 @@
+/*
+ * 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 <asm/byteorder.h>
+
+#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)
+{
+	/* boot bus? */
+	return ((p >> 40) & 0xff) == 0;
+}
+
+# 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 */