From: Ley Foon Tan <lftan@altera.com>
Date: Thu, 6 Nov 2014 07:19:42 +0000 (+0800)
Subject: nios2: I/O Mapping
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~20^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b8baec4d652df19be6e0997c50b9894e5ca30a8;p=pandora-kernel.git

nios2: I/O Mapping

This patch adds several definitions for I/O accessors and ioremap().

Signed-off-by: Ley Foon Tan <lftan@altera.com>
---

diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
new file mode 100644
index 000000000000..13dc22b50800
--- /dev/null
+++ b/arch/nios2/include/asm/io.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 Altera Corporation
+ * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_NIOS2_IO_H
+#define _ASM_NIOS2_IO_H
+
+#include <asm/pgtable-bits.h>
+#include <asm-generic/iomap.h>
+
+/* PCI is not supported in nios2, set this to 0. */
+#define IO_SPACE_LIMIT 0
+
+#define readb_relaxed(addr)	readb(addr)
+#define readw_relaxed(addr)	readw(addr)
+#define readl_relaxed(addr)	readl(addr)
+
+#define writeb_relaxed(x, addr)	writeb(x, addr)
+#define writew_relaxed(x, addr)	writew(x, addr)
+#define writel_relaxed(x, addr)	writel(x, addr)
+
+#include <asm-generic/io.h>
+
+extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
+			unsigned long cacheflag);
+extern void __iounmap(void __iomem *addr);
+
+static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
+{
+	return __ioremap(physaddr, size, 0);
+}
+
+static inline void __iomem *ioremap_nocache(unsigned long physaddr,
+						unsigned long size)
+{
+	return __ioremap(physaddr, size, 0);
+}
+
+static inline void iounmap(void __iomem *addr)
+{
+	__iounmap(addr);
+}
+
+/* Pages to physical address... */
+# define page_to_phys(page)	virt_to_phys(page_to_virt(page))
+# define page_to_bus(page)	page_to_virt(page)
+
+/* Macros used for converting between virtual and physical mappings. */
+# define phys_to_virt(vaddr)	\
+	((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
+/* Clear top 3 bits */
+# define virt_to_phys(vaddr)	\
+	((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
+
+#endif /* _ASM_NIOS2_IO_H */
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