Hexagon: Add ioremap support

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
new file mode 100644
index 000000000000..3a37bc3b0116
--- /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));
+}