X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=include%2Flinux%2Fio.h;h=81877ea39309aea73cef4a63a3212c69ab5c9131;hb=8d1413b28033c49c7f1a4d320e815d7a5531acee;hp=aa3f5af670b579bc9de78a9d1a4075daa6c039c2;hpb=63c422afe3739b68bec0b5c42807d1450c951caf;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/io.h b/include/linux/io.h
index aa3f5af670b..81877ea3930 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -18,6 +18,7 @@
 #ifndef _LINUX_IO_H
 #define _LINUX_IO_H
 
+#include <linux/types.h>
 #include <asm/io.h>
 #include <asm/page.h>
 
@@ -27,4 +28,31 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
 int ioremap_page_range(unsigned long addr, unsigned long end,
 		       unsigned long phys_addr, pgprot_t prot);
 
+/**
+ *	check_signature		-	find BIOS signatures
+ *	@io_addr: mmio address to check
+ *	@signature:  signature block
+ *	@length: length of signature
+ *
+ *	Perform a signature comparison with the mmio address io_addr. This
+ *	address should have been obtained by ioremap.
+ *	Returns 1 on a match.
+ */
+
+static inline int check_signature(const volatile void __iomem *io_addr,
+	const unsigned char *signature, int length)
+{
+	int retval = 0;
+	do {
+		if (readb(io_addr) != *signature)
+			goto out;
+		io_addr++;
+		signature++;
+		length--;
+	} while (length);
+	retval = 1;
+out:
+	return retval;
+}
+
 #endif /* _LINUX_IO_H */