ARM: 6271/1: Introduce *_relaxed() I/O accessors
Catalin Marinas [Wed, 28 Jul 2010 21:00:54 +0000 (22:00 +0100)]
This patch introduces readl*_relaxed()/write*_relaxed() as the main I/O
accessors (when __mem_pci is defined). The standard read*()/write*()
macros are now based on the relaxed accessors.

This patch is in preparation for a subsequent patch which adds barriers
to the I/O accessors.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/io.h

index c980156..9db072d 100644 (file)
@@ -179,25 +179,30 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
  * IO port primitives for more information.
  */
 #ifdef __mem_pci
-#define readb(c) ({ __u8  __v = __raw_readb(__mem_pci(c)); __v; })
-#define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
+#define readb_relaxed(c) ({ u8  __v = __raw_readb(__mem_pci(c)); __v; })
+#define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16) \
                                        __raw_readw(__mem_pci(c))); __v; })
-#define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
+#define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32) \
                                        __raw_readl(__mem_pci(c))); __v; })
-#define readb_relaxed(addr) readb(addr)
-#define readw_relaxed(addr) readw(addr)
-#define readl_relaxed(addr) readl(addr)
+
+#define writeb_relaxed(v,c)    ((void)__raw_writeb(v,__mem_pci(c)))
+#define writew_relaxed(v,c)    ((void)__raw_writew((__force u16) \
+                                       cpu_to_le16(v),__mem_pci(c)))
+#define writel_relaxed(v,c)    ((void)__raw_writel((__force u32) \
+                                       cpu_to_le32(v),__mem_pci(c)))
+
+#define readb(c)               readb_relaxed(c)
+#define readw(c)               readw_relaxed(c)
+#define readl(c)               readl_relaxed(c)
+
+#define writeb(v,c)            writeb_relaxed(v,c)
+#define writew(v,c)            writew_relaxed(v,c)
+#define writel(v,c)            writel_relaxed(v,c)
 
 #define readsb(p,d,l)          __raw_readsb(__mem_pci(p),d,l)
 #define readsw(p,d,l)          __raw_readsw(__mem_pci(p),d,l)
 #define readsl(p,d,l)          __raw_readsl(__mem_pci(p),d,l)
 
-#define writeb(v,c)            __raw_writeb(v,__mem_pci(c))
-#define writew(v,c)            __raw_writew((__force __u16) \
-                                       cpu_to_le16(v),__mem_pci(c))
-#define writel(v,c)            __raw_writel((__force __u32) \
-                                       cpu_to_le32(v),__mem_pci(c))
-
 #define writesb(p,d,l)         __raw_writesb(__mem_pci(p),d,l)
 #define writesw(p,d,l)         __raw_writesw(__mem_pci(p),d,l)
 #define writesl(p,d,l)         __raw_writesl(__mem_pci(p),d,l)