[mirror_ubuntu-artful-kernel.git] / arch / avr32 / mm / ioremap.c

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/io.h>

#include <asm/pgtable.h>
#include <asm/addrspace.h>

/*
 * Re-map an arbitrary physical address space into the kernel virtual
 * address space. Needed when the kernel wants to access physical
 * memory directly.
 */
void __iomem *__ioremap(unsigned long phys_addr, size_t size,
			unsigned long flags)
{
	unsigned long addr;
	struct vm_struct *area;
	unsigned long offset, last_addr;
	pgprot_t prot;

	/*
	 * Check if we can simply use the P4 segment. This area is
	 * uncacheable, so if caching/buffering is requested, we can't
	 * use it.
	 */
	if ((phys_addr >= P4SEG) && (flags == 0))
		return (void __iomem *)phys_addr;

	/* Don't allow wraparound or zero size */
	last_addr = phys_addr + size - 1;
	if (!size || last_addr < phys_addr)
		return NULL;

	/*
	 * XXX: When mapping regular RAM, we'd better make damn sure
	 * it's never used for anything else.  But this is really the
	 * caller's responsibility...
	 */
	if (PHYSADDR(P2SEGADDR(phys_addr)) == phys_addr)
		return (void __iomem *)P2SEGADDR(phys_addr);

	/* Mappings have to be page-aligned */
	offset = phys_addr & ~PAGE_MASK;
	phys_addr &= PAGE_MASK;
	size = PAGE_ALIGN(last_addr + 1) - phys_addr;

	prot = __pgprot(_PAGE_PRESENT | _PAGE_GLOBAL | _PAGE_RW | _PAGE_DIRTY
			| _PAGE_ACCESSED | _PAGE_TYPE_SMALL | flags);

	/*
	 * Ok, go for it..
	 */
	area = get_vm_area(size, VM_IOREMAP);
	if (!area)
		return NULL;
	area->phys_addr = phys_addr;
	addr = (unsigned long )area->addr;
	if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
		vunmap((void *)addr);
		return NULL;
	}

	return (void __iomem *)(offset + (char *)addr);
}
EXPORT_SYMBOL(__ioremap);

void __iounmap(void __iomem *addr)
{
	struct vm_struct *p;

	if ((unsigned long)addr >= P4SEG)
		return;
	if (PXSEG(addr) == P2SEG)
		return;

	p = remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
	if (unlikely(!p)) {
		printk (KERN_ERR "iounmap: bad address %p\n", addr);
		return;
	}

	kfree (p);
}
EXPORT_SYMBOL(__iounmap);
Commit	Line	Data
5f97f7f9 HS	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#include <linux/vmalloc.h>
27ac792c	9	#include <linux/mm.h>
5f97f7f9	10	#include <linux/module.h>
86c8eb36	11	#include <linux/io.h>
5f97f7f9	12
5f97f7f9	13	#include <asm/pgtable.h>
5f97f7f9 HS	14	#include <asm/addrspace.h>
5f97f7f9 HS	15
5f97f7f9 HS	16	/*
	17	* Re-map an arbitrary physical address space into the kernel virtual
	18	* address space. Needed when the kernel wants to access physical
	19	* memory directly.
	20	*/
	21	void __iomem *__ioremap(unsigned long phys_addr, size_t size,
	22	unsigned long flags)
	23	{
86c8eb36	24	unsigned long addr;
5f97f7f9 HS	25	struct vm_struct *area;
	26	unsigned long offset, last_addr;
	27	pgprot_t prot;
	28
	29	/*
	30	* Check if we can simply use the P4 segment. This area is
	31	* uncacheable, so if caching/buffering is requested, we can't
	32	* use it.
	33	*/
	34	if ((phys_addr >= P4SEG) && (flags == 0))
	35	return (void __iomem *)phys_addr;
	36
	37	/* Don't allow wraparound or zero size */
	38	last_addr = phys_addr + size - 1;
	39	if (!size \|\| last_addr < phys_addr)
	40	return NULL;
	41
	42	/*
	43	* XXX: When mapping regular RAM, we'd better make damn sure
	44	* it's never used for anything else. But this is really the
	45	* caller's responsibility...
	46	*/
	47	if (PHYSADDR(P2SEGADDR(phys_addr)) == phys_addr)
	48	return (void __iomem *)P2SEGADDR(phys_addr);
	49
	50	/* Mappings have to be page-aligned */
	51	offset = phys_addr & ~PAGE_MASK;
	52	phys_addr &= PAGE_MASK;
	53	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
	54
86c8eb36	55	prot = __pgprot(_PAGE_PRESENT \| _PAGE_GLOBAL \| _PAGE_RW \| _PAGE_DIRTY
5f97f7f9 HS	56	\| _PAGE_ACCESSED \| _PAGE_TYPE_SMALL \| flags);
	57
	58	/*
	59	* Ok, go for it..
	60	*/
	61	area = get_vm_area(size, VM_IOREMAP);
	62	if (!area)
	63	return NULL;
	64	area->phys_addr = phys_addr;
86c8eb36 HS	65	addr = (unsigned long )area->addr;
	66	if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
	67	vunmap((void *)addr);
5f97f7f9 HS	68	return NULL;
	69	}
	70
	71	return (void __iomem )(offset + (char )addr);
	72	}
	73	EXPORT_SYMBOL(__ioremap);
	74
	75	void __iounmap(void __iomem *addr)
	76	{
	77	struct vm_struct *p;
	78
	79	if ((unsigned long)addr >= P4SEG)
	80	return;
bee8ce80 HS	81	if (PXSEG(addr) == P2SEG)
bee8ce80 HS	82	return;
5f97f7f9 HS	83
	84	p = remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
	85	if (unlikely(!p)) {
	86	printk (KERN_ERR "iounmap: bad address %p\n", addr);
	87	return;
	88	}
	89
	90	kfree (p);
	91	}
	92	EXPORT_SYMBOL(__iounmap);