[U-Boot-Users] [PATCH 4/7] Implement __raw_{read, write}[bwl] on all architectures
Haavard Skinnemoen
hskinnemoen at atmel.com
Thu Dec 13 12:56:31 CET 2007
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 at atmel.com>
---
include/asm-m68k/io.h | 14 ++++++++++++++
include/asm-nios/io.h | 8 ++++++++
include/asm-nios2/io.h | 8 ++++++++
include/asm-ppc/io.h | 32 +++++++++++++++++++++++++++++++-
4 files changed, 61 insertions(+), 1 deletions(-)
diff --git a/include/asm-m68k/io.h b/include/asm-m68k/io.h
index e14a581..29b3972 100644
--- a/include/asm-m68k/io.h
+++ b/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)
diff --git a/include/asm-nios/io.h b/include/asm-nios/io.h
index d77695a..08e46a3 100644
--- a/include/asm-nios/io.h
+++ b/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"\
diff --git a/include/asm-nios2/io.h b/include/asm-nios2/io.h
index 5bb5322..54cbd57 100644
--- a/include/asm-nios2/io.h
+++ b/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;})
diff --git a/include/asm-ppc/io.h b/include/asm-ppc/io.h
index 11dfa1c..86fe8dc 100644
--- a/include/asm-ppc/io.h
+++ b/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;
--
1.5.3.4
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