[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/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/sizes.h>

#include <asm/mach/map.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_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);
}

#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 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 += 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.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;
	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;

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