Implement __raw_{read,write}[bwl] on all architectures

This adds implementations of __raw_read[bwl] and __raw_write[bwl] to
m68k, ppc, nios and nios2. The m68k and ppc implementations were taken
from Linux.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

include/asm-m68k/io.h

@@ -28,6 +28,20 @@
 
 #include <asm/byteorder.h>
 
+/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
+ * two accesses to memory, which may be undesirable for some devices.
+ */
+#define __raw_readb(addr) \
+    ({ u8 __v = (*(volatile u8 *) (addr)); __v; })
+#define __raw_readw(addr) \
+    ({ u16 __v = (*(volatile u16 *) (addr)); __v; })
+#define __raw_readl(addr) \
+    ({ u32 __v = (*(volatile u32 *) (addr)); __v; })
+
+#define __raw_writeb(addr,b) (void)((*(volatile u8 *) (addr)) = (b))
+#define __raw_writew(addr,w) (void)((*(volatile u16 *) (addr)) = (w))
+#define __raw_writel(addr,l) (void)((*(volatile u32 *) (addr)) = (l))
+
 #define readb(addr)		in_8((volatile u8 *)(addr))
 #define writeb(b,addr)		out_8((volatile u8 *)(addr), (b))
 #if !defined(__BIG_ENDIAN)

include/asm-nios/io.h

@@ -23,6 +23,14 @@
 #ifndef __ASM_NIOS_IO_H_
 #define __ASM_NIOS_IO_H_
 
+#define __raw_writeb(v,a)       (*(volatile unsigned char  *)(a) = (v))
+#define __raw_writew(v,a)       (*(volatile unsigned short *)(a) = (v))
+#define __raw_writel(v,a)       (*(volatile unsigned int   *)(a) = (v))
+
+#define __raw_readb(a)          (*(volatile unsigned char  *)(a))
+#define __raw_readw(a)          (*(volatile unsigned short *)(a))
+#define __raw_readl(a)          (*(volatile unsigned int   *)(a))
+
 #define readb(addr)\
 	({unsigned char val;\
 	 asm volatile(  "	pfxio	0		\n"\

include/asm-nios2/io.h

@@ -33,6 +33,14 @@ extern unsigned char inb (unsigned char *port);
 extern unsigned short inw (unsigned short *port);
 extern unsigned inl (unsigned port);
 
+#define __raw_writeb(v,a)       (*(volatile unsigned char  *)(a) = (v))
+#define __raw_writew(v,a)       (*(volatile unsigned short *)(a) = (v))
+#define __raw_writel(v,a)       (*(volatile unsigned int   *)(a) = (v))
+
+#define __raw_readb(a)          (*(volatile unsigned char  *)(a))
+#define __raw_readw(a)          (*(volatile unsigned short *)(a))
+#define __raw_readl(a)          (*(volatile unsigned int   *)(a))
+
 #define readb(addr)\
 	({unsigned char val;\
 	 asm volatile( "ldbio %0, 0(%1)" :"=r"(val) : "r" (addr)); val;})

include/asm-ppc/io.h

@@ -121,13 +121,43 @@ static inline void isync(void)
 #define iobarrier_w()  eieio()
 
 /*
+ * Non ordered and non-swapping "raw" accessors
+ */
+#define __iomem
+#define PCI_FIX_ADDR(addr)	(addr)
+
+static inline unsigned char __raw_readb(const volatile void __iomem *addr)
+{
+	return *(volatile unsigned char *)PCI_FIX_ADDR(addr);
+}
+static inline unsigned short __raw_readw(const volatile void __iomem *addr)
+{
+	return *(volatile unsigned short *)PCI_FIX_ADDR(addr);
+}
+static inline unsigned int __raw_readl(const volatile void __iomem *addr)
+{
+	return *(volatile unsigned int *)PCI_FIX_ADDR(addr);
+}
+static inline void __raw_writeb(unsigned char v, volatile void __iomem *addr)
+{
+	*(volatile unsigned char *)PCI_FIX_ADDR(addr) = v;
+}
+static inline void __raw_writew(unsigned short v, volatile void __iomem *addr)
+{
+	*(volatile unsigned short *)PCI_FIX_ADDR(addr) = v;
+}
+static inline void __raw_writel(unsigned int v, volatile void __iomem *addr)
+{
+	*(volatile unsigned int *)PCI_FIX_ADDR(addr) = v;
+}
+
+/*
  * 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
  *
  * Read operations have additional twi & isync to make sure the read
  * is actually performed (i.e. the data has come back) before we start
  * executing any following instructions.
  */
-#define __iomem
 extern inline int in_8(const volatile unsigned char __iomem *addr)
 {
 	int ret;