[deliverable/linux.git] / arch / hexagon / mm / ioremap.c

/*
 * I/O remap functions for Hexagon
 *
 * Copyright (c) 2010-2011, The Linux Foundation. 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>
#include <linux/mm.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));
}
Commit	Line	Data
b7f3785f RK	1	/*
	2	* I/O remap functions for Hexagon
	3	*
e1858b2a	4	* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
b7f3785f RK	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 and
	8	* only version 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	18	* 02110-1301, USA.
	19	*/
	20
	21	#include <linux/io.h>
	22	#include <linux/vmalloc.h>
cb84c2b4	23	#include <linux/mm.h>
b7f3785f RK	24
	25	void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
	26	{
	27	unsigned long last_addr, addr;
	28	unsigned long offset = phys_addr & ~PAGE_MASK;
	29	struct vm_struct *area;
	30
	31	pgprot_t prot = __pgprot(_PAGE_PRESENT\|_PAGE_READ\|_PAGE_WRITE
	32	\|(__HEXAGON_C_DEV << 6));
	33
	34	last_addr = phys_addr + size - 1;
	35
	36	/* Wrapping not allowed */
	37	if (!size \|\| (last_addr < phys_addr))
	38	return NULL;
	39
	40	/* Rounds up to next page size, including whole-page offset */
	41	size = PAGE_ALIGN(offset + size);
	42
	43	area = get_vm_area(size, VM_IOREMAP);
	44	addr = (unsigned long)area->addr;
	45
	46	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
	47	vunmap((void *)addr);
	48	return NULL;
	49	}
	50
	51	return (void __iomem *) (offset + addr);
	52	}
	53
	54	void __iounmap(const volatile void __iomem *addr)
	55	{
	56	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
	57	}