m68k: group io mapping definitions and functions

Create a new header file, kmap.h, that groups all the definitions and
functions associated with the io mapping and remapping.

Currently the functions are spread across raw_io.h and io_mm.h. And in
the future we will want to use these in io_no.h as well. So it makes
sense to move them all together into a single header file.

It is named after the arch/m68k/mm/kmap.c file that actually implements
many of the exported functions.

Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Angelo Dureghello <angelo@sysam.it>

9 files changed, 98 insertions, 57 deletions

diff --git a/arch/m68k/include/asm/atarihw.h b/arch/m68k/include/asm/atarihw.h
index 972c8f33f055..9000b249d225 100644
--- a/arch/m68k/include/asm/atarihw.h
+++ b/arch/m68k/include/asm/atarihw.h
@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <asm/bootinfo-atari.h>
 #include <asm/raw_io.h>
+#include <asm/kmap.h>
 
 extern u_long atari_mch_cookie;
 extern u_long atari_mch_type;
diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index 22e778e293c6..21fba26f57f4 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -26,6 +26,7 @@
 #include <linux/compiler.h>
 #include <asm/raw_io.h>
 #include <asm/virtconvert.h>
+#include <asm/kmap.h>
 
 #include <asm-generic/iomap.h>
 
@@ -461,39 +462,6 @@ static inline void isa_delay(void)
 
 #define mmiowb()
 
-static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
-{
-        return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
-}
-static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
-{
-        return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
-}
-#define ioremap_uc ioremap_nocache
-static inline void __iomem *ioremap_wt(unsigned long physaddr,
-                                         unsigned long size)
-{
-        return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
-}
-static inline void __iomem *ioremap_fullcache(unsigned long physaddr,
-                                      unsigned long size)
-{
-        return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
-}
-
-static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
-{
-        __builtin_memset((void __force *) addr, val, count);
-}
-static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
-{
-        __builtin_memcpy(dst, (void __force *) src, count);
-}
-static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
-{
-        __builtin_memcpy((void __force *) dst, src, count);
-}
-
 #ifndef CONFIG_SUN3
 #define IO_SPACE_LIMIT 0xffff
 #else
@@ -515,15 +483,6 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int
  */
 #define xlate_dev_kmem_ptr(p)   p
 
-static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
-{
-        return (void __iomem *) port;
-}
-
-static inline void ioport_unmap(void __iomem *p)
-{
-}
-
 #define readb_relaxed(addr)     readb(addr)
 #define readw_relaxed(addr)     readw(addr)
 #define readl_relaxed(addr)     readl(addr)
diff --git a/arch/m68k/include/asm/io_no.h b/arch/m68k/include/asm/io_no.h
index 5095693e46ce..e9c70f754e02 100644
--- a/arch/m68k/include/asm/io_no.h
+++ b/arch/m68k/include/asm/io_no.h
@@ -25,6 +25,18 @@
 #define writew __raw_writew
 #define writel __raw_writel
 
+/*
+ * These are defined in kmap.h as static inline functions. To maintain
+ * previous behavior we put these define guards here so io_mm.h doesn't
+ * see them.
+ */
+#ifdef CONFIG_MMU
+#define memset_io memset_io
+#define memcpy_fromio memcpy_fromio
+#define memcpy_toio memcpy_toio
+#endif
+
+#include <asm/kmap.h>
 #include <asm/virtconvert.h>
 #include <asm-generic/io.h>
 
diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
new file mode 100644
index 000000000000..84b8333db8ad
--- /dev/null
+++ b/arch/m68k/include/asm/kmap.h
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _KMAP_H
+#define _KMAP_H
+
+#ifdef CONFIG_MMU
+
+/* Values for nocacheflag and cmode */
+#define IOMAP_FULL_CACHING              0
+#define IOMAP_NOCACHE_SER               1
+#define IOMAP_NOCACHE_NONSER            2
+#define IOMAP_WRITETHROUGH              3
+
+/*
+ * These functions exported by arch/m68k/mm/kmap.c.
+ * Only needed on MMU enabled systems.
+ */
+extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
+                               int cacheflag);
+extern void iounmap(void __iomem *addr);
+extern void __iounmap(void *addr, unsigned long size);
+
+#define ioremap ioremap
+static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
+{
+        return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
+}
+
+#define ioremap_nocache ioremap_nocache
+static inline void __iomem *ioremap_nocache(unsigned long physaddr,
+                                            unsigned long size)
+{
+        return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
+}
+
+#define ioremap_uc ioremap_nocache
+static inline void __iomem *ioremap_wt(unsigned long physaddr,
+                                       unsigned long size)
+{
+        return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
+}
+
+#define ioremap_fillcache ioremap_fullcache
+static inline void __iomem *ioremap_fullcache(unsigned long physaddr,
+                                              unsigned long size)
+{
+        return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
+}
+
+static inline void memset_io(volatile void __iomem *addr, unsigned char val,
+                             int count)
+{
+        __builtin_memset((void __force *) addr, val, count);
+}
+
+static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
+                                 int count)
+{
+        __builtin_memcpy(dst, (void __force *) src, count);
+}
+
+static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
+                               int count)
+{
+        __builtin_memcpy((void __force *) dst, src, count);
+}
+
+#endif /* CONFIG_MMU */
+
+#define ioport_map ioport_map
+static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+        return (void __iomem *) port;
+}
+
+#define ioport_unmap ioport_unmap
+static inline void ioport_unmap(void __iomem *p)
+{
+}
+
+#endif /* _KMAP_H */
diff --git a/arch/m68k/include/asm/nubus.h b/arch/m68k/include/asm/nubus.h
index d0d2039e434e..c2281da6c51a 100644
--- a/arch/m68k/include/asm/nubus.h
+++ b/arch/m68k/include/asm/nubus.h
@@ -3,6 +3,7 @@
 #define _ASM_M68K_NUBUS_H
 
 #include <asm/raw_io.h>
+#include <asm/kmap.h>
 
 #define nubus_readb raw_inb
 #define nubus_readw raw_inw
diff --git a/arch/m68k/include/asm/q40_master.h b/arch/m68k/include/asm/q40_master.h
index 3a89c088800c..9b00fb8079e6 100644
--- a/arch/m68k/include/asm/q40_master.h
+++ b/arch/m68k/include/asm/q40_master.h
@@ -8,7 +8,7 @@
 #define _Q40_MASTER_H
 
 #include <asm/raw_io.h>
-
+#include <asm/kmap.h>
 
 #define q40_master_addr 0xff000000
 
diff --git a/arch/m68k/include/asm/raw_io.h b/arch/m68k/include/asm/raw_io.h
index 05e940c29b54..85761255dde5 100644
--- a/arch/m68k/include/asm/raw_io.h
+++ b/arch/m68k/include/asm/raw_io.h
@@ -13,20 +13,6 @@
 
 #include <asm/byteorder.h>
 
-
-/* Values for nocacheflag and cmode */
-#define IOMAP_FULL_CACHING              0
-#define IOMAP_NOCACHE_SER               1
-#define IOMAP_NOCACHE_NONSER            2
-#define IOMAP_WRITETHROUGH              3
-
-extern void iounmap(void __iomem *addr);
-
-extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
-                       int cacheflag);
-extern void __iounmap(void *addr, unsigned long size);
-
-
 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
  * two accesses to memory, which may be undesirable for some devices.
  */
diff --git a/arch/m68k/include/asm/vga.h b/arch/m68k/include/asm/vga.h
index 010a624d1b39..819d46d91886 100644
--- a/arch/m68k/include/asm/vga.h
+++ b/arch/m68k/include/asm/vga.h
@@ -3,6 +3,7 @@
 #define _ASM_M68K_VGA_H
 
 #include <asm/raw_io.h>
+#include <asm/kmap.h>
 
 /*
  * FIXME
diff --git a/arch/m68k/include/asm/zorro.h b/arch/m68k/include/asm/zorro.h
index 96f64bf7bcaa..60fc4b6f294d 100644
--- a/arch/m68k/include/asm/zorro.h
+++ b/arch/m68k/include/asm/zorro.h
@@ -3,6 +3,7 @@
 #define _ASM_M68K_ZORRO_H
 
 #include <asm/raw_io.h>
+#include <asm/kmap.h>
 
 #define z_readb raw_inb
 #define z_readw raw_inw