[patch v3 28/36] Hexagon: Add ioremap support

Richard Kuo
2011-09-09T01:09:15Z

[-- Attachment #1: ioremap.diff --]
[-- Type: text/plain, Size: 2354 bytes --]

Removed redundant flush_cache_vmap.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>

---
arch/hexagon/mm/ioremap.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)

Index: linux-hexagon-kernel/arch/hexagon/mm/ioremap.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/mm/ioremap.c 2011-09-03 20:14:59.784981559 -0500
@@ -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));
+}