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

/*
 *  linux/arch/arm/mm/ioremap.c
 *
 * Re-map IO memory to kernel address space so that we can access it.
 *
 * (C) Copyright 1995 1996 Linus Torvalds
 *
 * Hacked for ARM by Phil Blundell <philb@gnu.org>
 * Hacked to allow all architectures to build, and various cleanups
 * by Russell King
 *
 * This allows a driver to remap an arbitrary region of bus memory into
 * virtual space.  One should *only* use readl, writel, memcpy_toio and
 * so on with such remapped areas.
 *
 * Because the ARM only has a 32-bit address space we can't address the
 * whole of the (physical) PCI space at once.  PCI huge-mode addressing
 * allows us to circumvent this restriction by splitting PCI space into
 * two 2GB chunks and mapping only one at a time into processor memory.
 * We use MMU protection domains to trap any attempt to access the bank
 * that is not currently mapped.  (This isn't fully implemented yet.)
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/io.h>

#include <asm/cputype.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/sizes.h>

#include <asm/mach/map.h>
#include "mm.h"

/*
 * Used by ioremap() and iounmap() code to mark (super)section-mapped
 * I/O regions in vm_struct->flags field.
 */
#define VM_ARM_SECTION_MAPPING	0x80000000

static int remap_area_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
			  unsigned long phys_addr, const struct mem_type *type)
{
	pgprot_t prot = __pgprot(type->prot_pte);
	pte_t *pte;

	pte = pte_alloc_kernel(pmd, addr);
	if (!pte)
		return -ENOMEM;

	do {
		if (!pte_none(*pte))
			goto bad;

		set_pte_ext(pte, pfn_pte(phys_addr >> PAGE_SHIFT, prot), 0);
		phys_addr += PAGE_SIZE;
	} while (pte++, addr += PAGE_SIZE, addr != end);
	return 0;

 bad:
	printk(KERN_CRIT "remap_area_pte: page already exists\n");
	BUG();
}

static inline int remap_area_pmd(pgd_t *pgd, unsigned long addr,
				 unsigned long end, unsigned long phys_addr,
				 const struct mem_type *type)
{
	unsigned long next;
	pmd_t *pmd;
	int ret = 0;

	pmd = pmd_alloc(&init_mm, pgd, addr);
	if (!pmd)
		return -ENOMEM;

	do {
		next = pmd_addr_end(addr, end);
		ret = remap_area_pte(pmd, addr, next, phys_addr, type);
		if (ret)
			return ret;
		phys_addr += next - addr;
	} while (pmd++, addr = next, addr != end);
	return ret;
}

static int remap_area_pages(unsigned long start, unsigned long pfn,
			    size_t size, const struct mem_type *type)
{
	unsigned long addr = start;
	unsigned long next, end = start + size;
	unsigned long phys_addr = __pfn_to_phys(pfn);
	pgd_t *pgd;
	int err = 0;

	BUG_ON(addr >= end);
	pgd = pgd_offset_k(addr);
	do {
		next = pgd_addr_end(addr, end);
		err = remap_area_pmd(pgd, addr, next, phys_addr, type);
		if (err)
			break;
		phys_addr += next - addr;
	} while (pgd++, addr = next, addr != end);

	return err;
}


void __check_kvm_seq(struct mm_struct *mm)
{
	unsigned int seq;

	do {
		seq = init_mm.context.kvm_seq;
		memcpy(pgd_offset(mm, VMALLOC_START),
		       pgd_offset_k(VMALLOC_START),
		       sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
					pgd_index(VMALLOC_START)));
		mm->context.kvm_seq = seq;
	} while (seq != init_mm.context.kvm_seq);
}

#ifndef CONFIG_SMP
/*
 * Section support is unsafe on SMP - If you iounmap and ioremap a region,
 * the other CPUs will not see this change until their next context switch.
 * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
 * which requires the new ioremap'd region to be referenced, the CPU will
 * reference the _old_ region.
 *
 * Note that get_vm_area() allocates a guard 4K page, so we need to mask
 * the size back to 1MB aligned or we will overflow in the loop below.
 */
static void unmap_area_sections(unsigned long virt, unsigned long size)
{
	unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
	pgd_t *pgd;

	flush_cache_vunmap(addr, end);
	pgd = pgd_offset_k(addr);
	do {
		pmd_t pmd, *pmdp = pmd_offset(pgd, addr);

		pmd = *pmdp;
		if (!pmd_none(pmd)) {
			/*
			 * Clear the PMD from the page table, and
			 * increment the kvm sequence so others
			 * notice this change.
			 *
			 * Note: this is still racy on SMP machines.
			 */
			pmd_clear(pmdp);
			init_mm.context.kvm_seq++;

			/*
			 * Free the page table, if there was one.
			 */
			if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
				pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
		}

		addr += PGDIR_SIZE;
		pgd++;
	} while (addr < end);

	/*
	 * Ensure that the active_mm is up to date - we want to
	 * catch any use-after-iounmap cases.
	 */
	if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
		__check_kvm_seq(current->active_mm);

	flush_tlb_kernel_range(virt, end);
}

static int
remap_area_sections(unsigned long virt, unsigned long pfn,
		    size_t size, const struct mem_type *type)
{
	unsigned long addr = virt, end = virt + size;
	pgd_t *pgd;

	/*
	 * Remove and free any PTE-based mapping, and
	 * sync the current kernel mapping.
	 */
	unmap_area_sections(virt, size);

	pgd = pgd_offset_k(addr);
	do {
		pmd_t *pmd = pmd_offset(pgd, addr);

		pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
		pfn += SZ_1M >> PAGE_SHIFT;
		pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
		pfn += SZ_1M >> PAGE_SHIFT;
		flush_pmd_entry(pmd);

		addr += PGDIR_SIZE;
		pgd++;
	} while (addr < end);

	return 0;
}

static int
remap_area_supersections(unsigned long virt, unsigned long pfn,
			 size_t size, const struct mem_type *type)
{
	unsigned long addr = virt, end = virt + size;
	pgd_t *pgd;

	/*
	 * Remove and free any PTE-based mapping, and
	 * sync the current kernel mapping.
	 */
	unmap_area_sections(virt, size);

	pgd = pgd_offset_k(virt);
	do {
		unsigned long super_pmd_val, i;

		super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
				PMD_SECT_SUPER;
		super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;

		for (i = 0; i < 8; i++) {
			pmd_t *pmd = pmd_offset(pgd, addr);

			pmd[0] = __pmd(super_pmd_val);
			pmd[1] = __pmd(super_pmd_val);
			flush_pmd_entry(pmd);

			addr += PGDIR_SIZE;
			pgd++;
		}

		pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
	} while (addr < end);

	return 0;
}
#endif


/*
 * Remap an arbitrary physical address space into the kernel virtual
 * address space. Needed when the kernel wants to access high addresses
 * directly.
 *
 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
 * have to convert them into an offset in a page-aligned mapping, but the
 * caller shouldn't need to know that small detail.
 *
 * 'flags' are the extra L_PTE_ flags that you want to specify for this
 * mapping.  See <asm/pgtable.h> for more information.
 */
void __iomem *
__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
		  unsigned int mtype)
{
	const struct mem_type *type;
	int err;
	unsigned long addr;
 	struct vm_struct * area;

	/*
	 * High mappings must be supersection aligned
	 */
	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
		return NULL;

	type = get_mem_type(mtype);
	if (!type)
		return NULL;

	/*
	 * Page align the mapping size, taking account of any offset.
	 */
	size = PAGE_ALIGN(offset + size);

 	area = get_vm_area(size, VM_IOREMAP);
 	if (!area)
 		return NULL;
 	addr = (unsigned long)area->addr;

#ifndef CONFIG_SMP
	if (DOMAIN_IO == 0 &&
	    (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
	       cpu_is_xsc3()) && pfn >= 0x100000 &&
	       !((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
		area->flags |= VM_ARM_SECTION_MAPPING;
		err = remap_area_supersections(addr, pfn, size, type);
	} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
		area->flags |= VM_ARM_SECTION_MAPPING;
		err = remap_area_sections(addr, pfn, size, type);
	} else
#endif
		err = remap_area_pages(addr, pfn, size, type);

	if (err) {
 		vunmap((void *)addr);
 		return NULL;
 	}

	flush_cache_vmap(addr, addr + size);
	return (void __iomem *) (offset + addr);
}
EXPORT_SYMBOL(__arm_ioremap_pfn);

void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
	unsigned long last_addr;
 	unsigned long offset = phys_addr & ~PAGE_MASK;
 	unsigned long pfn = __phys_to_pfn(phys_addr);

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

 	return __arm_ioremap_pfn(pfn, offset, size, mtype);
}
EXPORT_SYMBOL(__arm_ioremap);

void __iounmap(volatile void __iomem *io_addr)
{
	void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
#ifndef CONFIG_SMP
	struct vm_struct **p, *tmp;

	/*
	 * If this is a section based mapping we need to handle it
	 * specially as the VM subsystem does not know how to handle
	 * such a beast. We need the lock here b/c we need to clear
	 * all the mappings before the area can be reclaimed
	 * by someone else.
	 */
	write_lock(&vmlist_lock);
	for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) {
		if ((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) {
			if (tmp->flags & VM_ARM_SECTION_MAPPING) {
				unmap_area_sections((unsigned long)tmp->addr,
						    tmp->size);
			}
			break;
		}
	}
	write_unlock(&vmlist_lock);
#endif

	vunmap(addr);
}
EXPORT_SYMBOL(__iounmap);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/mm/ioremap.c
	3	*
	4	* Re-map IO memory to kernel address space so that we can access it.
	5	*
	6	* (C) Copyright 1995 1996 Linus Torvalds
	7	*
	8	* Hacked for ARM by Phil Blundell <philb@gnu.org>
	9	* Hacked to allow all architectures to build, and various cleanups
	10	* by Russell King
	11	*
	12	* This allows a driver to remap an arbitrary region of bus memory into
	13	* virtual space. One should only use readl, writel, memcpy_toio and
	14	* so on with such remapped areas.
	15	*
	16	* Because the ARM only has a 32-bit address space we can't address the
	17	* whole of the (physical) PCI space at once. PCI huge-mode addressing
	18	* allows us to circumvent this restriction by splitting PCI space into
	19	* two 2GB chunks and mapping only one at a time into processor memory.
	20	* We use MMU protection domains to trap any attempt to access the bank
	21	* that is not currently mapped. (This isn't fully implemented yet.)
	22	*/
	23	#include <linux/module.h>
	24	#include <linux/errno.h>
	25	#include <linux/mm.h>
	26	#include <linux/vmalloc.h>
fced80c7	27	#include <linux/io.h>
1da177e4	28
0ba8b9b2	29	#include <asm/cputype.h>
1da177e4	30	#include <asm/cacheflush.h>
ff0daca5 RK	31	#include <asm/mmu_context.h>
ff0daca5 RK	32	#include <asm/pgalloc.h>
1da177e4	33	#include <asm/tlbflush.h>
ff0daca5 RK	34	#include <asm/sizes.h>
ff0daca5 RK	35
b29e9f5e RK	36	#include <asm/mach/map.h>
	37	#include "mm.h"
	38
ff0daca5	39	/*
a069c896 LB	40	* Used by ioremap() and iounmap() code to mark (super)section-mapped
a069c896 LB	41	* I/O regions in vm_struct->flags field.
ff0daca5 RK	42	*/
ff0daca5 RK	43	#define VM_ARM_SECTION_MAPPING 0x80000000
1da177e4	44
da2c12a2	45	static int remap_area_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
b29e9f5e	46	unsigned long phys_addr, const struct mem_type *type)
1da177e4	47	{
b29e9f5e	48	pgprot_t prot = __pgprot(type->prot_pte);
da2c12a2 RK	49	pte_t *pte;
	50
	51	pte = pte_alloc_kernel(pmd, addr);
	52	if (!pte)
	53	return -ENOMEM;
1da177e4	54
1da177e4 LT	55	do {
	56	if (!pte_none(*pte))
	57	goto bad;
	58
40d192b6	59	set_pte_ext(pte, pfn_pte(phys_addr >> PAGE_SHIFT, prot), 0);
1da177e4	60	phys_addr += PAGE_SIZE;
da2c12a2 RK	61	} while (pte++, addr += PAGE_SIZE, addr != end);
da2c12a2 RK	62	return 0;
1da177e4 LT	63
1da177e4 LT	64	bad:
da2c12a2	65	printk(KERN_CRIT "remap_area_pte: page already exists\n");
1da177e4 LT	66	BUG();
	67	}
	68
da2c12a2 RK	69	static inline int remap_area_pmd(pgd_t *pgd, unsigned long addr,
da2c12a2 RK	70	unsigned long end, unsigned long phys_addr,
b29e9f5e	71	const struct mem_type *type)
1da177e4	72	{
da2c12a2 RK	73	unsigned long next;
	74	pmd_t *pmd;
	75	int ret = 0;
1da177e4	76
da2c12a2 RK	77	pmd = pmd_alloc(&init_mm, pgd, addr);
	78	if (!pmd)
	79	return -ENOMEM;
1da177e4	80
1da177e4	81	do {
da2c12a2	82	next = pmd_addr_end(addr, end);
b29e9f5e	83	ret = remap_area_pte(pmd, addr, next, phys_addr, type);
da2c12a2 RK	84	if (ret)
	85	return ret;
	86	phys_addr += next - addr;
	87	} while (pmd++, addr = next, addr != end);
	88	return ret;
1da177e4 LT	89	}
1da177e4 LT	90
da2c12a2	91	static int remap_area_pages(unsigned long start, unsigned long pfn,
b29e9f5e	92	size_t size, const struct mem_type *type)
1da177e4	93	{
da2c12a2 RK	94	unsigned long addr = start;
da2c12a2 RK	95	unsigned long next, end = start + size;
9d4ae727	96	unsigned long phys_addr = __pfn_to_phys(pfn);
da2c12a2	97	pgd_t *pgd;
1da177e4	98	int err = 0;
1da177e4	99
da2c12a2 RK	100	BUG_ON(addr >= end);
da2c12a2 RK	101	pgd = pgd_offset_k(addr);
1da177e4	102	do {
da2c12a2	103	next = pgd_addr_end(addr, end);
b29e9f5e	104	err = remap_area_pmd(pgd, addr, next, phys_addr, type);
da2c12a2	105	if (err)
1da177e4	106	break;
da2c12a2 RK	107	phys_addr += next - addr;
da2c12a2 RK	108	} while (pgd++, addr = next, addr != end);
1da177e4	109
1da177e4 LT	110	return err;
	111	}
	112
ff0daca5 RK	113
	114	void __check_kvm_seq(struct mm_struct *mm)
	115	{
	116	unsigned int seq;
	117
	118	do {
	119	seq = init_mm.context.kvm_seq;
	120	memcpy(pgd_offset(mm, VMALLOC_START),
	121	pgd_offset_k(VMALLOC_START),
	122	sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
	123	pgd_index(VMALLOC_START)));
	124	mm->context.kvm_seq = seq;
	125	} while (seq != init_mm.context.kvm_seq);
	126	}
	127
	128	#ifndef CONFIG_SMP
	129	/*
	130	* Section support is unsafe on SMP - If you iounmap and ioremap a region,
	131	* the other CPUs will not see this change until their next context switch.
	132	* Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
	133	* which requires the new ioremap'd region to be referenced, the CPU will
	134	* reference the _old_ region.
	135	*
	136	* Note that get_vm_area() allocates a guard 4K page, so we need to mask
	137	* the size back to 1MB aligned or we will overflow in the loop below.
	138	*/
	139	static void unmap_area_sections(unsigned long virt, unsigned long size)
	140	{
24f11ec0	141	unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
ff0daca5 RK	142	pgd_t *pgd;
	143
	144	flush_cache_vunmap(addr, end);
	145	pgd = pgd_offset_k(addr);
	146	do {
	147	pmd_t pmd, *pmdp = pmd_offset(pgd, addr);
	148
	149	pmd = *pmdp;
	150	if (!pmd_none(pmd)) {
	151	/*
	152	* Clear the PMD from the page table, and
	153	* increment the kvm sequence so others
	154	* notice this change.
	155	*
	156	* Note: this is still racy on SMP machines.
	157	*/
	158	pmd_clear(pmdp);
	159	init_mm.context.kvm_seq++;
	160
	161	/*
	162	* Free the page table, if there was one.
	163	*/
	164	if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
5e541973	165	pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
ff0daca5 RK	166	}
	167
	168	addr += PGDIR_SIZE;
	169	pgd++;
	170	} while (addr < end);
	171
	172	/*
	173	* Ensure that the active_mm is up to date - we want to
	174	* catch any use-after-iounmap cases.
	175	*/
	176	if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
	177	__check_kvm_seq(current->active_mm);
	178
	179	flush_tlb_kernel_range(virt, end);
	180	}
	181
	182	static int
	183	remap_area_sections(unsigned long virt, unsigned long pfn,
b29e9f5e	184	size_t size, const struct mem_type *type)
ff0daca5	185	{
b29e9f5e	186	unsigned long addr = virt, end = virt + size;
ff0daca5 RK	187	pgd_t *pgd;
	188
	189	/*
	190	* Remove and free any PTE-based mapping, and
	191	* sync the current kernel mapping.
	192	*/
	193	unmap_area_sections(virt, size);
	194
ff0daca5 RK	195	pgd = pgd_offset_k(addr);
	196	do {
	197	pmd_t *pmd = pmd_offset(pgd, addr);
	198
b29e9f5e	199	pmd[0] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5	200	pfn += SZ_1M >> PAGE_SHIFT;
b29e9f5e	201	pmd[1] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5 RK	202	pfn += SZ_1M >> PAGE_SHIFT;
	203	flush_pmd_entry(pmd);
	204
	205	addr += PGDIR_SIZE;
	206	pgd++;
	207	} while (addr < end);
	208
	209	return 0;
	210	}
a069c896 LB	211
	212	static int
	213	remap_area_supersections(unsigned long virt, unsigned long pfn,
b29e9f5e	214	size_t size, const struct mem_type *type)
a069c896	215	{
b29e9f5e	216	unsigned long addr = virt, end = virt + size;
a069c896 LB	217	pgd_t *pgd;
	218
	219	/*
	220	* Remove and free any PTE-based mapping, and
	221	* sync the current kernel mapping.
	222	*/
	223	unmap_area_sections(virt, size);
	224
a069c896 LB	225	pgd = pgd_offset_k(virt);
	226	do {
	227	unsigned long super_pmd_val, i;
	228
b29e9f5e RK	229	super_pmd_val = __pfn_to_phys(pfn) \| type->prot_sect \|
b29e9f5e RK	230	PMD_SECT_SUPER;
a069c896 LB	231	super_pmd_val \|= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
	232
	233	for (i = 0; i < 8; i++) {
	234	pmd_t *pmd = pmd_offset(pgd, addr);
	235
	236	pmd[0] = __pmd(super_pmd_val);
	237	pmd[1] = __pmd(super_pmd_val);
	238	flush_pmd_entry(pmd);
	239
	240	addr += PGDIR_SIZE;
	241	pgd++;
	242	}
	243
	244	pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
	245	} while (addr < end);
	246
	247	return 0;
	248	}
ff0daca5 RK	249	#endif
	250
	251
1da177e4 LT	252	/*
	253	* Remap an arbitrary physical address space into the kernel virtual
	254	* address space. Needed when the kernel wants to access high addresses
	255	* directly.
	256	*
	257	* NOTE! We need to allow non-page-aligned mappings too: we will obviously
	258	* have to convert them into an offset in a page-aligned mapping, but the
	259	* caller shouldn't need to know that small detail.
	260	*
	261	* 'flags' are the extra L_PTE_ flags that you want to specify for this
4baa9922	262	* mapping. See <asm/pgtable.h> for more information.
1da177e4	263	*/
9d4ae727	264	void __iomem *
3603ab2b RK	265	__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
3603ab2b RK	266	unsigned int mtype)
9d4ae727	267	{
b29e9f5e	268	const struct mem_type *type;
ff0daca5	269	int err;
9d4ae727 DS	270	unsigned long addr;
9d4ae727 DS	271	struct vm_struct * area;
a069c896 LB	272
	273	/*
	274	* High mappings must be supersection aligned
	275	*/
	276	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
	277	return NULL;
9d4ae727	278
3603ab2b RK	279	type = get_mem_type(mtype);
	280	if (!type)
	281	return NULL;
b29e9f5e	282
6d78b5f9 RK	283	/*
	284	* Page align the mapping size, taking account of any offset.
	285	*/
	286	size = PAGE_ALIGN(offset + size);
c924aff8	287
9d4ae727 DS	288	area = get_vm_area(size, VM_IOREMAP);
	289	if (!area)
	290	return NULL;
	291	addr = (unsigned long)area->addr;
ff0daca5 RK	292
ff0daca5 RK	293	#ifndef CONFIG_SMP
412489af CM	294	if (DOMAIN_IO == 0 &&
412489af CM	295	(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) \|\|
4a56c1e4	296	cpu_is_xsc3()) && pfn >= 0x100000 &&
a069c896 LB	297	!((__pfn_to_phys(pfn) \| size \| addr) & ~SUPERSECTION_MASK)) {
a069c896 LB	298	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	299	err = remap_area_supersections(addr, pfn, size, type);
a069c896	300	} else if (!((__pfn_to_phys(pfn) \| size \| addr) & ~PMD_MASK)) {
ff0daca5	301	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	302	err = remap_area_sections(addr, pfn, size, type);
ff0daca5 RK	303	} else
ff0daca5 RK	304	#endif
b29e9f5e	305	err = remap_area_pages(addr, pfn, size, type);
ff0daca5 RK	306
ff0daca5 RK	307	if (err) {
478922c2	308	vunmap((void *)addr);
9d4ae727 DS	309	return NULL;
9d4ae727 DS	310	}
ff0daca5 RK	311
	312	flush_cache_vmap(addr, addr + size);
	313	return (void __iomem *) (offset + addr);
9d4ae727	314	}
3603ab2b	315	EXPORT_SYMBOL(__arm_ioremap_pfn);
9d4ae727	316
1da177e4	317	void __iomem *
3603ab2b	318	__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
1da177e4	319	{
9d4ae727 DS	320	unsigned long last_addr;
	321	unsigned long offset = phys_addr & ~PAGE_MASK;
	322	unsigned long pfn = __phys_to_pfn(phys_addr);
1da177e4	323
9d4ae727 DS	324	/*
	325	* Don't allow wraparound or zero size
	326	*/
1da177e4 LT	327	last_addr = phys_addr + size - 1;
	328	if (!size \|\| last_addr < phys_addr)
	329	return NULL;
	330
3603ab2b	331	return __arm_ioremap_pfn(pfn, offset, size, mtype);
1da177e4	332	}
3603ab2b	333	EXPORT_SYMBOL(__arm_ioremap);
1da177e4	334
09d9bae0	335	void __iounmap(volatile void __iomem *io_addr)
1da177e4	336	{
09d9bae0	337	void addr = (void )(PAGE_MASK & (unsigned long)io_addr);
ceaccbd2	338	#ifndef CONFIG_SMP
ff0daca5	339	struct vm_struct *p, tmp;
ff0daca5	340
ff0daca5 RK	341	/*
ff0daca5 RK	342	* If this is a section based mapping we need to handle it
6cbdc8c5	343	* specially as the VM subsystem does not know how to handle
ff0daca5 RK	344	* such a beast. We need the lock here b/c we need to clear
	345	* all the mappings before the area can be reclaimed
	346	* by someone else.
	347	*/
	348	write_lock(&vmlist_lock);
	349	for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) {
09d9bae0	350	if ((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) {
ff0daca5	351	if (tmp->flags & VM_ARM_SECTION_MAPPING) {
ff0daca5 RK	352	unmap_area_sections((unsigned long)tmp->addr,
ff0daca5 RK	353	tmp->size);
ff0daca5 RK	354	}
	355	break;
	356	}
	357	}
	358	write_unlock(&vmlist_lock);
7cddc397	359	#endif
ff0daca5	360
24f11ec0	361	vunmap(addr);
1da177e4 LT	362	}
1da177e4 LT	363	EXPORT_SYMBOL(__iounmap);