[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 <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/sizes.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 inline void
remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
	       unsigned long phys_addr, pgprot_t pgprot)
{
	unsigned long end;

	address &= ~PMD_MASK;
	end = address + size;
	if (end > PMD_SIZE)
		end = PMD_SIZE;
	BUG_ON(address >= end);
	do {
		if (!pte_none(*pte))
			goto bad;

		set_pte(pte, pfn_pte(phys_addr >> PAGE_SHIFT, pgprot));
		address += PAGE_SIZE;
		phys_addr += PAGE_SIZE;
		pte++;
	} while (address && (address < end));
	return;

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

static inline int
remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
	       unsigned long phys_addr, unsigned long flags)
{
	unsigned long end;
	pgprot_t pgprot;

	address &= ~PGDIR_MASK;
	end = address + size;

	if (end > PGDIR_SIZE)
		end = PGDIR_SIZE;

	phys_addr -= address;
	BUG_ON(address >= end);

	pgprot = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_WRITE | flags);
	do {
		pte_t * pte = pte_alloc_kernel(pmd, address);
		if (!pte)
			return -ENOMEM;
		remap_area_pte(pte, address, end - address, address + phys_addr, pgprot);
		address = (address + PMD_SIZE) & PMD_MASK;
		pmd++;
	} while (address && (address < end));
	return 0;
}

static int
remap_area_pages(unsigned long start, unsigned long pfn,
		 unsigned long size, unsigned long flags)
{
	unsigned long address = start;
	unsigned long end = start + size;
	unsigned long phys_addr = __pfn_to_phys(pfn);
	int err = 0;
	pgd_t * dir;

	phys_addr -= address;
	dir = pgd_offset(&init_mm, address);
	BUG_ON(address >= end);
	do {
		pmd_t *pmd = pmd_alloc(&init_mm, dir, address);
		if (!pmd) {
			err = -ENOMEM;
			break;
		}
		if (remap_area_pmd(pmd, address, end - address,
					 phys_addr + address, flags)) {
			err = -ENOMEM;
			break;
		}

		address = (address + PGDIR_SIZE) & PGDIR_MASK;
		dir++;
	} while (address && (address < 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);
	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(pmd_page_kernel(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,
		    unsigned long size, unsigned long flags)
{
	unsigned long prot, 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);

	prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO) |
	       (flags & (L_PTE_CACHEABLE | L_PTE_BUFFERABLE));

	/*
	 * ARMv6 and above need XN set to prevent speculative prefetches
	 * hitting IO.
	 */
	if (cpu_architecture() >= CPU_ARCH_ARMv6)
		prot |= PMD_SECT_XN;

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

		pmd[0] = __pmd(__pfn_to_phys(pfn) | prot);
		pfn += SZ_1M >> PAGE_SHIFT;
		pmd[1] = __pmd(__pfn_to_phys(pfn) | prot);
		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,
			 unsigned long size, unsigned long flags)
{
	unsigned long prot, 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);

	prot = PMD_TYPE_SECT | PMD_SECT_SUPER | PMD_SECT_AP_WRITE |
			PMD_DOMAIN(DOMAIN_IO) |
			(flags & (L_PTE_CACHEABLE | L_PTE_BUFFERABLE));

	/*
	 * ARMv6 and above need XN set to prevent speculative prefetches
	 * hitting IO.
	 */
	if (cpu_architecture() >= CPU_ARCH_ARMv6)
		prot |= PMD_SECT_XN;

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

		super_pmd_val = __pfn_to_phys(pfn) | prot;
		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 include/asm-arm/proc-armv/pgtable.h for more information.
 */
void __iomem *
__ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
	      unsigned long flags)
{
	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;

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

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

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

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

void __iomem *
__ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
{
	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;

	/*
 	 * Page align the mapping size
	 */
	size = PAGE_ALIGN(last_addr + 1) - phys_addr;

 	return __ioremap_pfn(pfn, offset, size, flags);
}
EXPORT_SYMBOL(__ioremap);

void __iounmap(void __iomem *addr)
{
	struct vm_struct **p, *tmp;
	unsigned int section_mapping = 0;

	addr = (void __iomem *)(PAGE_MASK & (unsigned long)addr);

#ifndef CONFIG_SMP
	/*
	 * If this is a section based mapping we need to handle it
	 * specially as the VM subysystem 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) {
				*p = tmp->next;
				unmap_area_sections((unsigned long)tmp->addr,
						    tmp->size);
				kfree(tmp);
				section_mapping = 1;
			}
			break;
		}
	}
	write_unlock(&vmlist_lock);
#endif

	if (!section_mapping)
		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>
	27
	28	#include <asm/cacheflush.h>
	29	#include <asm/io.h>
ff0daca5 RK	30	#include <asm/mmu_context.h>
ff0daca5 RK	31	#include <asm/pgalloc.h>
1da177e4	32	#include <asm/tlbflush.h>
ff0daca5 RK	33	#include <asm/sizes.h>
	34
	35	/*
a069c896 LB	36	* Used by ioremap() and iounmap() code to mark (super)section-mapped
a069c896 LB	37	* I/O regions in vm_struct->flags field.
ff0daca5 RK	38	*/
ff0daca5 RK	39	#define VM_ARM_SECTION_MAPPING 0x80000000
1da177e4 LT	40
	41	static inline void
	42	remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
	43	unsigned long phys_addr, pgprot_t pgprot)
	44	{
	45	unsigned long end;
	46
	47	address &= ~PMD_MASK;
	48	end = address + size;
	49	if (end > PMD_SIZE)
	50	end = PMD_SIZE;
	51	BUG_ON(address >= end);
	52	do {
	53	if (!pte_none(*pte))
	54	goto bad;
	55
	56	set_pte(pte, pfn_pte(phys_addr >> PAGE_SHIFT, pgprot));
	57	address += PAGE_SIZE;
	58	phys_addr += PAGE_SIZE;
	59	pte++;
	60	} while (address && (address < end));
	61	return;
	62
	63	bad:
	64	printk("remap_area_pte: page already exists\n");
	65	BUG();
	66	}
	67
	68	static inline int
	69	remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
	70	unsigned long phys_addr, unsigned long flags)
	71	{
	72	unsigned long end;
	73	pgprot_t pgprot;
	74
	75	address &= ~PGDIR_MASK;
	76	end = address + size;
	77
	78	if (end > PGDIR_SIZE)
	79	end = PGDIR_SIZE;
	80
	81	phys_addr -= address;
	82	BUG_ON(address >= end);
	83
	84	pgprot = __pgprot(L_PTE_PRESENT \| L_PTE_YOUNG \| L_PTE_DIRTY \| L_PTE_WRITE \| flags);
	85	do {
872fec16	86	pte_t * pte = pte_alloc_kernel(pmd, address);
1da177e4 LT	87	if (!pte)
	88	return -ENOMEM;
	89	remap_area_pte(pte, address, end - address, address + phys_addr, pgprot);
	90	address = (address + PMD_SIZE) & PMD_MASK;
	91	pmd++;
	92	} while (address && (address < end));
	93	return 0;
	94	}
	95
	96	static int
9d4ae727	97	remap_area_pages(unsigned long start, unsigned long pfn,
1da177e4 LT	98	unsigned long size, unsigned long flags)
	99	{
	100	unsigned long address = start;
	101	unsigned long end = start + size;
9d4ae727	102	unsigned long phys_addr = __pfn_to_phys(pfn);
1da177e4 LT	103	int err = 0;
	104	pgd_t * dir;
	105
	106	phys_addr -= address;
	107	dir = pgd_offset(&init_mm, address);
	108	BUG_ON(address >= end);
1da177e4 LT	109	do {
	110	pmd_t *pmd = pmd_alloc(&init_mm, dir, address);
	111	if (!pmd) {
	112	err = -ENOMEM;
	113	break;
	114	}
	115	if (remap_area_pmd(pmd, address, end - address,
	116	phys_addr + address, flags)) {
	117	err = -ENOMEM;
	118	break;
	119	}
	120
	121	address = (address + PGDIR_SIZE) & PGDIR_MASK;
	122	dir++;
	123	} while (address && (address < end));
	124
1da177e4 LT	125	return err;
	126	}
	127
ff0daca5 RK	128
	129	void __check_kvm_seq(struct mm_struct *mm)
	130	{
	131	unsigned int seq;
	132
	133	do {
	134	seq = init_mm.context.kvm_seq;
	135	memcpy(pgd_offset(mm, VMALLOC_START),
	136	pgd_offset_k(VMALLOC_START),
	137	sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
	138	pgd_index(VMALLOC_START)));
	139	mm->context.kvm_seq = seq;
	140	} while (seq != init_mm.context.kvm_seq);
	141	}
	142
	143	#ifndef CONFIG_SMP
	144	/*
	145	* Section support is unsafe on SMP - If you iounmap and ioremap a region,
	146	* the other CPUs will not see this change until their next context switch.
	147	* Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
	148	* which requires the new ioremap'd region to be referenced, the CPU will
	149	* reference the _old_ region.
	150	*
	151	* Note that get_vm_area() allocates a guard 4K page, so we need to mask
	152	* the size back to 1MB aligned or we will overflow in the loop below.
	153	*/
	154	static void unmap_area_sections(unsigned long virt, unsigned long size)
	155	{
	156	unsigned long addr = virt, end = virt + (size & ~SZ_1M);
	157	pgd_t *pgd;
	158
	159	flush_cache_vunmap(addr, end);
	160	pgd = pgd_offset_k(addr);
	161	do {
	162	pmd_t pmd, *pmdp = pmd_offset(pgd, addr);
	163
	164	pmd = *pmdp;
	165	if (!pmd_none(pmd)) {
	166	/*
	167	* Clear the PMD from the page table, and
	168	* increment the kvm sequence so others
	169	* notice this change.
	170	*
	171	* Note: this is still racy on SMP machines.
	172	*/
	173	pmd_clear(pmdp);
	174	init_mm.context.kvm_seq++;
	175
	176	/*
	177	* Free the page table, if there was one.
	178	*/
	179	if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
	180	pte_free_kernel(pmd_page_kernel(pmd));
	181	}
	182
	183	addr += PGDIR_SIZE;
	184	pgd++;
	185	} while (addr < end);
	186
	187	/*
	188	* Ensure that the active_mm is up to date - we want to
	189	* catch any use-after-iounmap cases.
	190	*/
	191	if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
192	__check_kvm_seq(current->active_mm);
193
194	flush_tlb_kernel_range(virt, end);
195	}
196
197	static int
198	remap_area_sections(unsigned long virt, unsigned long pfn,
199	unsigned long size, unsigned long flags)
200	{
201	unsigned long prot, addr = virt, end = virt + size;
202	pgd_t *pgd;
203
204	/*
205	* Remove and free any PTE-based mapping, and
206	* sync the current kernel mapping.
207	*/
208	unmap_area_sections(virt, size);
209
210	prot = PMD_TYPE_SECT \| PMD_SECT_AP_WRITE \| PMD_DOMAIN(DOMAIN_IO) \|
211	(flags & (L_PTE_CACHEABLE \| L_PTE_BUFFERABLE));
212
213	/*
214	* ARMv6 and above need XN set to prevent speculative prefetches
215	* hitting IO.
216	*/
217	if (cpu_architecture() >= CPU_ARCH_ARMv6)
218	prot \|= PMD_SECT_XN;
219
220	pgd = pgd_offset_k(addr);
221	do {
222	pmd_t *pmd = pmd_offset(pgd, addr);
223
224	pmd[0] = __pmd(__pfn_to_phys(pfn) \| prot);
225	pfn += SZ_1M >> PAGE_SHIFT;
226	pmd[1] = __pmd(__pfn_to_phys(pfn) \| prot);
227	pfn += SZ_1M >> PAGE_SHIFT;
228	flush_pmd_entry(pmd);
229
230	addr += PGDIR_SIZE;
231	pgd++;
232	} while (addr < end);
233
234	return 0;
235	}
a069c896 LB	236
	237	static int
	238	remap_area_supersections(unsigned long virt, unsigned long pfn,
	239	unsigned long size, unsigned long flags)
	240	{
	241	unsigned long prot, addr = virt, end = virt + size;
	242	pgd_t *pgd;
	243
	244	/*
	245	* Remove and free any PTE-based mapping, and
	246	* sync the current kernel mapping.
	247	*/
	248	unmap_area_sections(virt, size);
	249
	250	prot = PMD_TYPE_SECT \| PMD_SECT_SUPER \| PMD_SECT_AP_WRITE \|
	251	PMD_DOMAIN(DOMAIN_IO) \|
	252	(flags & (L_PTE_CACHEABLE \| L_PTE_BUFFERABLE));
	253
	254	/*
	255	* ARMv6 and above need XN set to prevent speculative prefetches
	256	* hitting IO.
	257	*/
	258	if (cpu_architecture() >= CPU_ARCH_ARMv6)
	259	prot \|= PMD_SECT_XN;
	260
	261	pgd = pgd_offset_k(virt);
	262	do {
	263	unsigned long super_pmd_val, i;
	264
	265	super_pmd_val = __pfn_to_phys(pfn) \| prot;
	266	super_pmd_val \|= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
	267
	268	for (i = 0; i < 8; i++) {
	269	pmd_t *pmd = pmd_offset(pgd, addr);
	270
	271	pmd[0] = __pmd(super_pmd_val);
	272	pmd[1] = __pmd(super_pmd_val);
	273	flush_pmd_entry(pmd);
	274
	275	addr += PGDIR_SIZE;
	276	pgd++;
	277	}
	278
	279	pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
	280	} while (addr < end);
	281
	282	return 0;
	283	}
ff0daca5 RK	284	#endif
	285
	286
1da177e4 LT	287	/*
	288	* Remap an arbitrary physical address space into the kernel virtual
	289	* address space. Needed when the kernel wants to access high addresses
	290	* directly.
	291	*
	292	* NOTE! We need to allow non-page-aligned mappings too: we will obviously
	293	* have to convert them into an offset in a page-aligned mapping, but the
	294	* caller shouldn't need to know that small detail.
	295	*
	296	* 'flags' are the extra L_PTE_ flags that you want to specify for this
	297	* mapping. See include/asm-arm/proc-armv/pgtable.h for more information.
	298	*/
9d4ae727 DS	299	void __iomem *
	300	__ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
	301	unsigned long flags)
	302	{
ff0daca5	303	int err;
9d4ae727 DS	304	unsigned long addr;
9d4ae727 DS	305	struct vm_struct * area;
a069c896 LB	306
	307	/*
	308	* High mappings must be supersection aligned
	309	*/
	310	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
	311	return NULL;
9d4ae727 DS	312
	313	area = get_vm_area(size, VM_IOREMAP);
	314	if (!area)
	315	return NULL;
	316	addr = (unsigned long)area->addr;
ff0daca5 RK	317
ff0daca5 RK	318	#ifndef CONFIG_SMP
67f3a588	319	if ((((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) \|\|
a069c896 LB	320	cpu_is_xsc3()) &&
	321	!((__pfn_to_phys(pfn) \| size \| addr) & ~SUPERSECTION_MASK)) {
	322	area->flags \|= VM_ARM_SECTION_MAPPING;
	323	err = remap_area_supersections(addr, pfn, size, flags);
	324	} else if (!((__pfn_to_phys(pfn) \| size \| addr) & ~PMD_MASK)) {
ff0daca5 RK	325	area->flags \|= VM_ARM_SECTION_MAPPING;
	326	err = remap_area_sections(addr, pfn, size, flags);
	327	} else
	328	#endif
	329	err = remap_area_pages(addr, pfn, size, flags);
	330
	331	if (err) {
478922c2	332	vunmap((void *)addr);
9d4ae727 DS	333	return NULL;
9d4ae727 DS	334	}
ff0daca5 RK	335
	336	flush_cache_vmap(addr, addr + size);
	337	return (void __iomem *) (offset + addr);
9d4ae727 DS	338	}
	339	EXPORT_SYMBOL(__ioremap_pfn);
	340
1da177e4	341	void __iomem *
67a1901f	342	__ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
1da177e4	343	{
9d4ae727 DS	344	unsigned long last_addr;
	345	unsigned long offset = phys_addr & ~PAGE_MASK;
	346	unsigned long pfn = __phys_to_pfn(phys_addr);
1da177e4	347
9d4ae727 DS	348	/*
	349	* Don't allow wraparound or zero size
	350	*/
1da177e4 LT	351	last_addr = phys_addr + size - 1;
	352	if (!size \|\| last_addr < phys_addr)
	353	return NULL;
	354
	355	/*
9d4ae727	356	* Page align the mapping size
1da177e4	357	*/
1da177e4 LT	358	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
1da177e4 LT	359
9d4ae727	360	return __ioremap_pfn(pfn, offset, size, flags);
1da177e4 LT	361	}
	362	EXPORT_SYMBOL(__ioremap);
	363
	364	void __iounmap(void __iomem *addr)
	365	{
ff0daca5 RK	366	struct vm_struct *p, tmp;
	367	unsigned int section_mapping = 0;
	368
	369	addr = (void __iomem *)(PAGE_MASK & (unsigned long)addr);
	370
7cddc397	371	#ifndef CONFIG_SMP
ff0daca5 RK	372	/*
	373	* If this is a section based mapping we need to handle it
	374	* specially as the VM subysystem does not know how to handle
	375	* such a beast. We need the lock here b/c we need to clear
	376	* all the mappings before the area can be reclaimed
	377	* by someone else.
	378	*/
	379	write_lock(&vmlist_lock);
	380	for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) {
	381	if((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) {
	382	if (tmp->flags & VM_ARM_SECTION_MAPPING) {
	383	*p = tmp->next;
	384	unmap_area_sections((unsigned long)tmp->addr,
	385	tmp->size);
	386	kfree(tmp);
	387	section_mapping = 1;
	388	}
	389	break;
	390	}
	391	}
	392	write_unlock(&vmlist_lock);
7cddc397	393	#endif
ff0daca5 RK	394
	395	if (!section_mapping)
	396	vunmap(addr);
1da177e4 LT	397	}
1da177e4 LT	398	EXPORT_SYMBOL(__iounmap);