linux-kernel - [PATCH v4 28/36] Hexagon: Add ioremap support

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Message-Id: <e97c6e$3hno0t@wolverine02.qualcomm.com>
Date:	Wed, 14 Sep 2011 13:19:12 -0500
From:	Richard Kuo <rkuo@...eaurora.org>
To:	linux-arch@...r.kernel.org, linux-hexagon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 28/36] Hexagon: Add ioremap support

Signed-off-by: Richard Kuo <rkuo@...eaurora.org>
Acked-by: Arnd Bergmann <arnd@...db.de>
---
 arch/hexagon/mm/ioremap.c |   56 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 56 insertions(+), 0 deletions(-)
 create mode 100644 arch/hexagon/mm/ioremap.c

diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
new file mode 100644
index 0000000..3a37bc3
--- /dev/null
+++ b/arch/hexagon/mm/ioremap.c
@@ -0,0 +1,56 @@
+/*
+ * I/O remap functions for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/vmalloc.h>
+
+void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
+{
+	unsigned long last_addr, addr;
+	unsigned long offset = phys_addr & ~PAGE_MASK;
+	struct vm_struct *area;
+
+	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
+					|(__HEXAGON_C_DEV << 6));
+
+	last_addr = phys_addr + size - 1;
+
+	/*  Wrapping not allowed  */
+	if (!size || (last_addr < phys_addr))
+		return NULL;
+
+	/*  Rounds up to next page size, including whole-page offset */
+	size = PAGE_ALIGN(offset + size);
+
+	area = get_vm_area(size, VM_IOREMAP);
+	addr = (unsigned long)area->addr;
+
+	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
+		vunmap((void *)addr);
+		return NULL;
+	}
+
+	return (void __iomem *) (offset + addr);
+}
+
+void __iounmap(const volatile void __iomem *addr)
+{
+	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
+}
-- 
1.7.1


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