1 files changed, 123 insertions, 0 deletions

diff --git a/include/asm-s390/io.h b/include/asm-s390/io.h
new file mode 100644
index 000000000000..8188fdc9884f
--- /dev/null
+++ b/include/asm-s390/io.h
@@ -0,0 +1,123 @@
+/*
+ *  include/asm-s390/io.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/io.h"
+ */
+
+#ifndef _S390_IO_H
+#define _S390_IO_H
+
+#ifdef __KERNEL__
+
+#include <linux/vmalloc.h>
+#include <asm/page.h>
+
+#define IO_SPACE_LIMIT 0xffffffff
+
+#define __io_virt(x)            ((void *)(PAGE_OFFSET | (unsigned long)(x)))
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ * These are pretty trivial
+ */
+extern inline unsigned long virt_to_phys(volatile void * address)
+{
+        unsigned long real_address;
+        __asm__ (
+#ifndef __s390x__
+                 "   lra    %0,0(%1)\n"
+                 "   jz     0f\n"
+                 "   sr     %0,%0\n"
+#else /* __s390x__ */
+                 "   lrag   %0,0(%1)\n"
+                 "   jz     0f\n"
+                 "   slgr   %0,%0\n"
+#endif /* __s390x__ */
+                 "0:"
+                 : "=a" (real_address) : "a" (address) : "cc" );
+        return real_address;
+}
+
+extern inline void * phys_to_virt(unsigned long address)
+{
+        return __io_virt(address);
+}
+
+/*
+ * Change "struct page" to physical address.
+ */
+#define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
+
+extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
+
+extern inline void * ioremap (unsigned long offset, unsigned long size)
+{
+        return __ioremap(offset, size, 0);
+}
+
+/*
+ * This one maps high address device memory and turns off caching for that area.
+ * it's useful if some control registers are in such an area and write combining
+ * or read caching is not desirable:
+ */
+extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
+{
+        return __ioremap(offset, size, 0);
+}
+
+extern void iounmap(void *addr);
+
+/*
+ * IO bus memory addresses are also 1:1 with the physical address
+ */
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+
+/*
+ * readX/writeX() are used to access memory mapped devices. On some
+ * architectures the memory mapped IO stuff needs to be accessed
+ * differently.
+ */
+
+#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
+#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
+#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
+
+#define readb_relaxed(addr) readb(addr)
+#define readw_relaxed(addr) readw(addr)
+#define readl_relaxed(addr) readl(addr)
+
+#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
+#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
+#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
+
+#define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
+#define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
+#define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
+
+#define inb_p(addr) readb(addr)
+#define inb(addr) readb(addr)
+
+#define outb(x,addr) ((void) writeb(x,addr))
+#define outb_p(x,addr) outb(x,addr)
+
+#define mmiowb()
+
+/*
+ * Convert a physical pointer to a virtual kernel pointer for /dev/mem
+ * access
+ */
+#define xlate_dev_mem_ptr(p)    __va(p)
+
+/*
+ * Convert a virtual cached pointer to an uncached pointer
+ */
+#define xlate_dev_kmem_ptr(p)   p
+
+#endif /* __KERNEL__ */
+
+#endif