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>

1 files changed, 80 insertions, 0 deletions

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 */