1 files changed, 25 insertions, 2 deletions

diff --git a/include/asm-x86/i8259.h b/include/asm-x86/i8259.h
index 67c319e0efc7..e2650f21ca8d 100644
--- a/include/asm-x86/i8259.h
+++ b/include/asm-x86/i8259.h
@@ -1,6 +1,8 @@
 #ifndef __ASM_I8259_H__
 #define __ASM_I8259_H__
 
+#include <linux/delay.h>
+
 extern unsigned int cached_irq_mask;
 
 #define __byte(x,y)             (((unsigned char *) &(y))[x])
@@ -29,7 +31,28 @@ extern void enable_8259A_irq(unsigned int irq);
 extern void disable_8259A_irq(unsigned int irq);
 extern unsigned int startup_8259A_irq(unsigned int irq);
 
-#define inb_pic         inb_p
-#define outb_pic        outb_p
+/* the PIC may need a careful delay on some platforms, hence specific calls */
+static inline unsigned char inb_pic(unsigned int port)
+{
+        unsigned char value = inb(port);
+
+        /*
+         * delay for some accesses to PIC on motherboard or in chipset
+         * must be at least one microsecond, so be safe here:
+         */
+        udelay(2);
+
+        return value;
+}
+
+static inline void outb_pic(unsigned char value, unsigned int port)
+{
+        outb(value, port);
+        /*
+         * delay for some accesses to PIC on motherboard or in chipset
+         * must be at least one microsecond, so be safe here:
+         */
+        udelay(2);
+}
 
 #endif  /* __ASM_I8259_H__ */