[PATCH] ARM: 2748/1: ixp2000 implementation of the iomap api

Patch from Lennert Buytenhek

A number of ixp2000 models have a bug where the byte lanes for PCI I/O
transactions are swapped.  We already work around this in our versions
of {in,out}{b,w,l}, but we also need to perform these workarounds in a
custom implementation of the new iomap API, provided in this patch.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Deepak Saxena
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 72 insertions, 0 deletions

diff --git a/include/asm-arm/arch-ixp2000/io.h b/include/asm-arm/arch-ixp2000/io.h
index e5c742bc233..5e56b47446e 100644
--- a/include/asm-arm/arch-ixp2000/io.h
+++ b/include/asm-arm/arch-ixp2000/io.h
@@ -48,6 +48,78 @@
 #define insw(p,d,l)             __raw_readsw(alignw(___io(p)),d,l)
 #define insl(p,d,l)             __raw_readsl(___io(p),d,l)
 
+#define __is_io_address(p)      ((((unsigned long)(p)) & ~(IXP2000_PCI_IO_SIZE - 1)) == IXP2000_PCI_IO_VIRT_BASE)
+
+#define ioread8(p)                                              \
+        ({                                                      \
+                unsigned int __v;                               \
+                                                                \
+                if (__is_io_address(p)) {                       \
+                        __v = __raw_readb(alignb(p));           \
+                } else {                                        \
+                        __v = __raw_readb(p);                   \
+                }                                               \
+                                                                \
+                __v;                                            \
+        })                                                      \
+
+#define ioread16(p)                                             \
+        ({                                                      \
+                unsigned int __v;                               \
+                                                                \
+                if (__is_io_address(p)) {                       \
+                        __v = __raw_readw(alignw(p));           \
+                } else {                                        \
+                        __v = le16_to_cpu(__raw_readw(p));      \
+                }                                               \
+                                                                \
+                __v;                                            \
+        })
+
+#define ioread32(p)                                             \
+        ({                                                      \
+                unsigned int __v;                               \
+                                                                \
+                if (__is_io_address(p)) {                       \
+                        __v = __raw_readl(p);                   \
+                } else {                                        \
+                        __v = le32_to_cpu(__raw_readl(p));      \
+                }                                               \
+                                                                \
+                 __v;                                           \
+        })
+
+#define iowrite8(v,p)                                           \
+        ({                                                      \
+                if (__is_io_address(p)) {                       \
+                        __raw_writeb((v), alignb(p));           \
+                } else {                                        \
+                        __raw_writeb((v), p);                   \
+                }                                               \
+        })
+
+#define iowrite16(v,p)                                          \
+        ({                                                      \
+                if (__is_io_address(p)) {                       \
+                        __raw_writew((v), alignw(p));           \
+                } else {                                        \
+                        __raw_writew(cpu_to_le16(v), p);        \
+                }                                               \
+        })
+
+#define iowrite32(v,p)                                          \
+        ({                                                      \
+                if (__is_io_address(p)) {                       \
+                        __raw_writel((v), p);                   \
+                } else {                                        \
+                        __raw_writel(cpu_to_le32(v), p);        \
+                }                                               \
+        })
+
+#define ioport_map(port, nr)    ___io(port)
+
+#define ioport_unmap(addr)
+
 
 #ifdef CONFIG_ARCH_IXDP2X01
 /*