Hexagon: Add ioremap support

/*

 * 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));

}