sh: add writesb(), readsb(), writesw() and readsw() to io.h

This patch adds inline versions of writesb(), readsb(), writesw() and
readsw() to include/asm-sh/io.h. Stolen from include/asm-avr32/io.h.

These functions are needed to compile certain device drivers such as
ax88796.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/asm-sh/io.h b/include/asm-sh/io.h
index e6a1877dcb20..1a336cdc75fe 100644
--- a/include/asm-sh/io.h
+++ b/include/asm-sh/io.h
@@ -135,6 +135,32 @@ void __raw_readsl(unsigned long addr, void *data, int longlen);
 # define writel(v,a)    ({ __raw_writel((v),(a)); mb(); })
 #endif
 
+#define __BUILD_MEMORY_STRING(bwlq, type)                               \
+                                                                        \
+static inline void writes##bwlq(volatile void __iomem *mem,             \
+                                const void *addr, unsigned int count)   \
+{                                                                       \
+        const volatile type *__addr = addr;                             \
+                                                                        \
+        while (count--) {                                               \
+                __raw_write##bwlq(*__addr, mem);                        \
+                __addr++;                                               \
+        }                                                               \
+}                                                                       \
+                                                                        \
+static inline void reads##bwlq(volatile void __iomem *mem, void *addr,  \
+                               unsigned int count)                      \
+{                                                                       \
+        volatile type *__addr = addr;                                   \
+                                                                        \
+        while (count--) {                                               \
+                *__addr = __raw_read##bwlq(mem);                        \
+                __addr++;                                               \
+        }                                                               \
+}
+
+__BUILD_MEMORY_STRING(b, u8)
+__BUILD_MEMORY_STRING(w, u16)
 #define writesl __raw_writesl
 #define readsl  __raw_readsl