diff options
author | Richard Kuo | 2011-10-31 18:52:53 -0500 |
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committer | Linus Torvalds | 2011-11-01 07:34:20 -0700 |
commit | b7f3785fbb3df3307290d4c236ffaa7ad172b6ed (patch) | |
tree | 7e6ff43046c437b1b280f5160b19bb63a8779c48 /arch/hexagon | |
parent | 65c3d7c525414d672c849d8696d6b8a3ebbae059 (diff) |
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>
Diffstat (limited to 'arch/hexagon')
-rw-r--r-- | arch/hexagon/mm/ioremap.c | 56 |
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)); +} |