[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 <linux/sizes.h>

#include <asm/cp15.h>
#include <asm/cputype.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/system_info.h>

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

int ioremap_page(unsigned long virt, unsigned long phys,
		 const struct mem_type *mtype)
{
	return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
				  __pgprot(mtype->prot_pte));
}
EXPORT_SYMBOL(ioremap_page);

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

	do {
		seq = init_mm.context.vmalloc_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.vmalloc_seq = seq;
	} while (seq != init_mm.context.vmalloc_seq);
}

#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
/*
 * 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_caller() 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;
	pud_t *pud;
	pmd_t *pmdp;

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

		if (!pmd_none(pmd)) {
			/*
			 * Clear the PMD from the page table, and
			 * increment the vmalloc sequence so others
			 * notice this change.
			 *
			 * Note: this is still racy on SMP machines.
			 */
			pmd_clear(pmdp);
			init_mm.context.vmalloc_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 += PMD_SIZE;
		pmdp += 2;
	} 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.vmalloc_seq != init_mm.context.vmalloc_seq)
		__check_vmalloc_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;
	pud_t *pud;
	pmd_t *pmd;

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

	pgd = pgd_offset_k(addr);
	pud = pud_offset(pgd, addr);
	pmd = pmd_offset(pud, addr);
	do {
		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 += PMD_SIZE;
		pmd += 2;
	} 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;
	pud_t *pud;
	pmd_t *pmd;

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

	pgd = pgd_offset_k(virt);
	pud = pud_offset(pgd, addr);
	pmd = pmd_offset(pud, addr);
	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[0] = __pmd(super_pmd_val);
			pmd[1] = __pmd(super_pmd_val);
			flush_pmd_entry(pmd);

			addr += PMD_SIZE;
			pmd += 2;
		}

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

	return 0;
}
#endif

void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
	unsigned long offset, size_t size, unsigned int mtype, void *caller)
{
	const struct mem_type *type;
	int err;
	unsigned long addr;
 	struct vm_struct * area;

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

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

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

	/*
	 * Try to reuse one of the static mapping whenever possible.
	 */
	read_lock(&vmlist_lock);
	for (area = vmlist; area; area = area->next) {
		if (!size || (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
			break;
		if (!(area->flags & VM_ARM_STATIC_MAPPING))
			continue;
		if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
			continue;
		if (__phys_to_pfn(area->phys_addr) > pfn ||
		    __pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
			continue;
		/* we can drop the lock here as we know *area is static */
		read_unlock(&vmlist_lock);
		addr = (unsigned long)area->addr;
		addr += __pfn_to_phys(pfn) - area->phys_addr;
		return (void __iomem *) (offset + addr);
	}
	read_unlock(&vmlist_lock);

	/*
	 * Don't allow RAM to be mapped - this causes problems with ARMv6+
	 */
	if (WARN_ON(pfn_valid(pfn)))
		return NULL;

	area = get_vm_area_caller(size, VM_IOREMAP, caller);
 	if (!area)
 		return NULL;
 	addr = (unsigned long)area->addr;
	area->phys_addr = __pfn_to_phys(pfn);

#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
	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 = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
					 __pgprot(type->prot_pte));

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

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

void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
	unsigned int mtype, void *caller)
{
	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_caller(pfn, offset, size, mtype,
			caller);
}

/*
 * 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.
 */
void __iomem *
__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
		  unsigned int mtype)
{
	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
			__builtin_return_address(0));
}
EXPORT_SYMBOL(__arm_ioremap_pfn);

void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
				      unsigned int, void *) =
	__arm_ioremap_caller;

void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
	return arch_ioremap_caller(phys_addr, size, mtype,
		__builtin_return_address(0));
}
EXPORT_SYMBOL(__arm_ioremap);

/*
 * Remap an arbitrary physical address space into the kernel virtual
 * address space as memory. Needed when the kernel wants to execute
 * code in external memory. This is needed for reprogramming source
 * clocks that would affect normal memory for example. Please see
 * CONFIG_GENERIC_ALLOCATOR for allocating external memory.
 */
void __iomem *
__arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached)
{
	unsigned int mtype;

	if (cached)
		mtype = MT_MEMORY;
	else
		mtype = MT_MEMORY_NONCACHED;

	return __arm_ioremap_caller(phys_addr, size, mtype,
			__builtin_return_address(0));
}

void __iounmap(volatile void __iomem *io_addr)
{
	void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
	struct vm_struct *vm;

	read_lock(&vmlist_lock);
	for (vm = vmlist; vm; vm = vm->next) {
		if (vm->addr > addr)
			break;
		if (!(vm->flags & VM_IOREMAP))
			continue;
		/* If this is a static mapping we must leave it alone */
		if ((vm->flags & VM_ARM_STATIC_MAPPING) &&
		    (vm->addr <= addr) && (vm->addr + vm->size > addr)) {
			read_unlock(&vmlist_lock);
			return;
		}
#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
		/*
		 * 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.
		 */
		if ((vm->addr == addr) &&
		    (vm->flags & VM_ARM_SECTION_MAPPING)) {
			unmap_area_sections((unsigned long)vm->addr, vm->size);
			break;
		}
#endif
	}
	read_unlock(&vmlist_lock);

	vunmap(addr);
}

void (*arch_iounmap)(volatile void __iomem *) = __iounmap;

void __arm_iounmap(volatile void __iomem *io_addr)
{
	arch_iounmap(io_addr);
}
EXPORT_SYMBOL(__arm_iounmap);

#ifdef CONFIG_PCI
int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
{
	BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);

	return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
				  PCI_IO_VIRT_BASE + offset + SZ_64K,
				  phys_addr,
				  __pgprot(get_mem_type(MT_DEVICE)->prot_pte));
}
EXPORT_SYMBOL_GPL(pci_ioremap_io);
#endif
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>
158e8bfe	28	#include <linux/sizes.h>
1da177e4	29
15d07dc9	30	#include <asm/cp15.h>
0ba8b9b2	31	#include <asm/cputype.h>
1da177e4	32	#include <asm/cacheflush.h>
ff0daca5 RK	33	#include <asm/mmu_context.h>
ff0daca5 RK	34	#include <asm/pgalloc.h>
1da177e4	35	#include <asm/tlbflush.h>
9f97da78	36	#include <asm/system_info.h>
ff0daca5	37
b29e9f5e	38	#include <asm/mach/map.h>
c2794437	39	#include <asm/mach/pci.h>
b29e9f5e RK	40	#include "mm.h"
b29e9f5e RK	41
69d3a84a HD	42	int ioremap_page(unsigned long virt, unsigned long phys,
	43	const struct mem_type *mtype)
	44	{
d7461963 RK	45	return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
d7461963 RK	46	__pgprot(mtype->prot_pte));
69d3a84a HD	47	}
69d3a84a HD	48	EXPORT_SYMBOL(ioremap_page);
ff0daca5	49
3e99675a	50	void __check_vmalloc_seq(struct mm_struct *mm)
ff0daca5 RK	51	{
	52	unsigned int seq;
	53
	54	do {
3e99675a	55	seq = init_mm.context.vmalloc_seq;
ff0daca5 RK	56	memcpy(pgd_offset(mm, VMALLOC_START),
	57	pgd_offset_k(VMALLOC_START),
	58	sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
	59	pgd_index(VMALLOC_START)));
3e99675a NP	60	mm->context.vmalloc_seq = seq;
3e99675a NP	61	} while (seq != init_mm.context.vmalloc_seq);
ff0daca5 RK	62	}
ff0daca5 RK	63
da028779	64	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
ff0daca5 RK	65	/*
	66	* Section support is unsafe on SMP - If you iounmap and ioremap a region,
	67	* the other CPUs will not see this change until their next context switch.
	68	* Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
	69	* which requires the new ioremap'd region to be referenced, the CPU will
	70	* reference the _old_ region.
	71	*
31aa8fd6 RK	72	* Note that get_vm_area_caller() allocates a guard 4K page, so we need to
31aa8fd6 RK	73	* mask the size back to 1MB aligned or we will overflow in the loop below.
ff0daca5 RK	74	*/
	75	static void unmap_area_sections(unsigned long virt, unsigned long size)
	76	{
24f11ec0	77	unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
ff0daca5	78	pgd_t *pgd;
03a6b827 CM	79	pud_t *pud;
03a6b827 CM	80	pmd_t *pmdp;
ff0daca5 RK	81
	82	flush_cache_vunmap(addr, end);
	83	pgd = pgd_offset_k(addr);
03a6b827 CM	84	pud = pud_offset(pgd, addr);
03a6b827 CM	85	pmdp = pmd_offset(pud, addr);
ff0daca5	86	do {
03a6b827	87	pmd_t pmd = *pmdp;
ff0daca5	88
ff0daca5 RK	89	if (!pmd_none(pmd)) {
	90	/*
	91	* Clear the PMD from the page table, and
3e99675a	92	* increment the vmalloc sequence so others
ff0daca5 RK	93	* notice this change.
	94	*
	95	* Note: this is still racy on SMP machines.
	96	*/
	97	pmd_clear(pmdp);
3e99675a	98	init_mm.context.vmalloc_seq++;
ff0daca5 RK	99
	100	/*
	101	* Free the page table, if there was one.
	102	*/
	103	if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
5e541973	104	pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
ff0daca5 RK	105	}
ff0daca5 RK	106
03a6b827 CM	107	addr += PMD_SIZE;
03a6b827 CM	108	pmdp += 2;
ff0daca5 RK	109	} while (addr < end);
	110
	111	/*
	112	* Ensure that the active_mm is up to date - we want to
	113	* catch any use-after-iounmap cases.
	114	*/
3e99675a NP	115	if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)
3e99675a NP	116	__check_vmalloc_seq(current->active_mm);
ff0daca5 RK	117
	118	flush_tlb_kernel_range(virt, end);
	119	}
	120
	121	static int
	122	remap_area_sections(unsigned long virt, unsigned long pfn,
b29e9f5e	123	size_t size, const struct mem_type *type)
ff0daca5	124	{
b29e9f5e	125	unsigned long addr = virt, end = virt + size;
ff0daca5	126	pgd_t *pgd;
03a6b827 CM	127	pud_t *pud;
03a6b827 CM	128	pmd_t *pmd;
ff0daca5 RK	129
	130	/*
	131	* Remove and free any PTE-based mapping, and
	132	* sync the current kernel mapping.
	133	*/
	134	unmap_area_sections(virt, size);
	135
ff0daca5	136	pgd = pgd_offset_k(addr);
03a6b827 CM	137	pud = pud_offset(pgd, addr);
03a6b827 CM	138	pmd = pmd_offset(pud, addr);
ff0daca5	139	do {
b29e9f5e	140	pmd[0] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5	141	pfn += SZ_1M >> PAGE_SHIFT;
b29e9f5e	142	pmd[1] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5 RK	143	pfn += SZ_1M >> PAGE_SHIFT;
	144	flush_pmd_entry(pmd);
	145
03a6b827 CM	146	addr += PMD_SIZE;
03a6b827 CM	147	pmd += 2;
ff0daca5 RK	148	} while (addr < end);
	149
	150	return 0;
	151	}
a069c896 LB	152
	153	static int
	154	remap_area_supersections(unsigned long virt, unsigned long pfn,
b29e9f5e	155	size_t size, const struct mem_type *type)
a069c896	156	{
b29e9f5e	157	unsigned long addr = virt, end = virt + size;
a069c896	158	pgd_t *pgd;
03a6b827 CM	159	pud_t *pud;
03a6b827 CM	160	pmd_t *pmd;
a069c896 LB	161
	162	/*
	163	* Remove and free any PTE-based mapping, and
	164	* sync the current kernel mapping.
	165	*/
	166	unmap_area_sections(virt, size);
	167
a069c896	168	pgd = pgd_offset_k(virt);
03a6b827 CM	169	pud = pud_offset(pgd, addr);
03a6b827 CM	170	pmd = pmd_offset(pud, addr);
a069c896 LB	171	do {
	172	unsigned long super_pmd_val, i;
	173
b29e9f5e RK	174	super_pmd_val = __pfn_to_phys(pfn) \| type->prot_sect \|
b29e9f5e RK	175	PMD_SECT_SUPER;
a069c896 LB	176	super_pmd_val \|= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
	177
	178	for (i = 0; i < 8; i++) {
a069c896 LB	179	pmd[0] = __pmd(super_pmd_val);
	180	pmd[1] = __pmd(super_pmd_val);
	181	flush_pmd_entry(pmd);
	182
03a6b827 CM	183	addr += PMD_SIZE;
03a6b827 CM	184	pmd += 2;
a069c896 LB	185	}
	186
	187	pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
	188	} while (addr < end);
	189
	190	return 0;
	191	}
ff0daca5 RK	192	#endif
ff0daca5 RK	193
31aa8fd6 RK	194	void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
31aa8fd6 RK	195	unsigned long offset, size_t size, unsigned int mtype, void *caller)
9d4ae727	196	{
b29e9f5e	197	const struct mem_type *type;
ff0daca5	198	int err;
9d4ae727 DS	199	unsigned long addr;
9d4ae727 DS	200	struct vm_struct * area;
a069c896	201
da028779	202	#ifndef CONFIG_ARM_LPAE
a069c896 LB	203	/*
	204	* High mappings must be supersection aligned
	205	*/
	206	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
	207	return NULL;
da028779	208	#endif
9d4ae727	209
3603ab2b RK	210	type = get_mem_type(mtype);
	211	if (!type)
	212	return NULL;
b29e9f5e	213
6d78b5f9 RK	214	/*
	215	* Page align the mapping size, taking account of any offset.
	216	*/
	217	size = PAGE_ALIGN(offset + size);
c924aff8	218
576d2f25 NP	219	/*
	220	* Try to reuse one of the static mapping whenever possible.
	221	*/
	222	read_lock(&vmlist_lock);
	223	for (area = vmlist; area; area = area->next) {
	224	if (!size \|\| (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
	225	break;
	226	if (!(area->flags & VM_ARM_STATIC_MAPPING))
	227	continue;
	228	if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
	229	continue;
	230	if (__phys_to_pfn(area->phys_addr) > pfn \|\|
97f10409	231	__pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
576d2f25 NP	232	continue;
	233	/* we can drop the lock here as we know area is static /
	234	read_unlock(&vmlist_lock);
	235	addr = (unsigned long)area->addr;
	236	addr += __pfn_to_phys(pfn) - area->phys_addr;
	237	return (void __iomem *) (offset + addr);
	238	}
	239	read_unlock(&vmlist_lock);
	240
	241	/*
	242	* Don't allow RAM to be mapped - this causes problems with ARMv6+
	243	*/
	244	if (WARN_ON(pfn_valid(pfn)))
	245	return NULL;
	246
31aa8fd6	247	area = get_vm_area_caller(size, VM_IOREMAP, caller);
9d4ae727 DS	248	if (!area)
	249	return NULL;
	250	addr = (unsigned long)area->addr;
a3d7193e	251	area->phys_addr = __pfn_to_phys(pfn);
ff0daca5	252
da028779	253	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
412489af CM	254	if (DOMAIN_IO == 0 &&
412489af CM	255	(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) \|\|
4a56c1e4	256	cpu_is_xsc3()) && pfn >= 0x100000 &&
a069c896 LB	257	!((__pfn_to_phys(pfn) \| size \| addr) & ~SUPERSECTION_MASK)) {
a069c896 LB	258	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	259	err = remap_area_supersections(addr, pfn, size, type);
a069c896	260	} else if (!((__pfn_to_phys(pfn) \| size \| addr) & ~PMD_MASK)) {
ff0daca5	261	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	262	err = remap_area_sections(addr, pfn, size, type);
ff0daca5 RK	263	} else
ff0daca5 RK	264	#endif
d7461963 RK	265	err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
d7461963 RK	266	__pgprot(type->prot_pte));
ff0daca5 RK	267
ff0daca5 RK	268	if (err) {
478922c2	269	vunmap((void *)addr);
9d4ae727 DS	270	return NULL;
9d4ae727 DS	271	}
ff0daca5 RK	272
	273	flush_cache_vmap(addr, addr + size);
	274	return (void __iomem *) (offset + addr);
9d4ae727	275	}
9d4ae727	276
31aa8fd6 RK	277	void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
31aa8fd6 RK	278	unsigned int mtype, void *caller)
1da177e4	279	{
9d4ae727 DS	280	unsigned long last_addr;
	281	unsigned long offset = phys_addr & ~PAGE_MASK;
	282	unsigned long pfn = __phys_to_pfn(phys_addr);
1da177e4	283
9d4ae727 DS	284	/*
	285	* Don't allow wraparound or zero size
	286	*/
1da177e4 LT	287	last_addr = phys_addr + size - 1;
	288	if (!size \|\| last_addr < phys_addr)
	289	return NULL;
	290
31aa8fd6 RK	291	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
	292	caller);
	293	}
	294
	295	/*
	296	* Remap an arbitrary physical address space into the kernel virtual
	297	* address space. Needed when the kernel wants to access high addresses
	298	* directly.
	299	*
	300	* NOTE! We need to allow non-page-aligned mappings too: we will obviously
	301	* have to convert them into an offset in a page-aligned mapping, but the
	302	* caller shouldn't need to know that small detail.
	303	*/
	304	void __iomem *
	305	__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
	306	unsigned int mtype)
	307	{
	308	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
	309	__builtin_return_address(0));
	310	}
	311	EXPORT_SYMBOL(__arm_ioremap_pfn);
	312
4fe7ef3a RH	313	void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
	314	unsigned int, void *) =
	315	__arm_ioremap_caller;
	316
31aa8fd6 RK	317	void __iomem *
	318	__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
	319	{
4fe7ef3a RH	320	return arch_ioremap_caller(phys_addr, size, mtype,
4fe7ef3a RH	321	__builtin_return_address(0));
1da177e4	322	}
3603ab2b	323	EXPORT_SYMBOL(__arm_ioremap);
1da177e4	324
6c5482d5 TL	325	/*
	326	* Remap an arbitrary physical address space into the kernel virtual
	327	* address space as memory. Needed when the kernel wants to execute
	328	* code in external memory. This is needed for reprogramming source
	329	* clocks that would affect normal memory for example. Please see
	330	* CONFIG_GENERIC_ALLOCATOR for allocating external memory.
	331	*/
	332	void __iomem *
	333	__arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached)
	334	{
	335	unsigned int mtype;
	336
	337	if (cached)
	338	mtype = MT_MEMORY;
	339	else
	340	mtype = MT_MEMORY_NONCACHED;
	341
	342	return __arm_ioremap_caller(phys_addr, size, mtype,
	343	__builtin_return_address(0));
	344	}
	345
09d9bae0	346	void __iounmap(volatile void __iomem *io_addr)
1da177e4	347	{
09d9bae0	348	void addr = (void )(PAGE_MASK & (unsigned long)io_addr);
6ee723a6	349	struct vm_struct *vm;
ff0daca5	350
6ee723a6 NP	351	read_lock(&vmlist_lock);
6ee723a6 NP	352	for (vm = vmlist; vm; vm = vm->next) {
576d2f25	353	if (vm->addr > addr)
ff0daca5	354	break;
576d2f25 NP	355	if (!(vm->flags & VM_IOREMAP))
	356	continue;
	357	/* If this is a static mapping we must leave it alone */
	358	if ((vm->flags & VM_ARM_STATIC_MAPPING) &&
	359	(vm->addr <= addr) && (vm->addr + vm->size > addr)) {
	360	read_unlock(&vmlist_lock);
	361	return;
ff0daca5	362	}
6ae25a5b	363	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
576d2f25 NP	364	/*
	365	* If this is a section based mapping we need to handle it
	366	* specially as the VM subsystem does not know how to handle
	367	* such a beast.
	368	*/
	369	if ((vm->addr == addr) &&
	370	(vm->flags & VM_ARM_SECTION_MAPPING)) {
	371	unmap_area_sections((unsigned long)vm->addr, vm->size);
	372	break;
	373	}
	374	#endif
ff0daca5	375	}
6ee723a6	376	read_unlock(&vmlist_lock);
ff0daca5	377
24f11ec0	378	vunmap(addr);
1da177e4	379	}
4fe7ef3a RH	380
	381	void (arch_iounmap)(volatile void __iomem ) = __iounmap;
	382
	383	void __arm_iounmap(volatile void __iomem *io_addr)
	384	{
	385	arch_iounmap(io_addr);
	386	}
	387	EXPORT_SYMBOL(__arm_iounmap);
c2794437 RH	388
	389	#ifdef CONFIG_PCI
	390	int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
	391	{
	392	BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
	393
	394	return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
	395	PCI_IO_VIRT_BASE + offset + SZ_64K,
	396	phys_addr,
	397	__pgprot(get_mem_type(MT_DEVICE)->prot_pte));
	398	}
	399	EXPORT_SYMBOL_GPL(pci_ioremap_io);
	400	#endif