[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"


LIST_HEAD(static_vmlist);

static struct static_vm *find_static_vm_paddr(phys_addr_t paddr,
			size_t size, unsigned int mtype)
{
	struct static_vm *svm;
	struct vm_struct *vm;

	list_for_each_entry(svm, &static_vmlist, list) {
		vm = &svm->vm;
		if (!(vm->flags & VM_ARM_STATIC_MAPPING))
			continue;
		if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
			continue;

		if (vm->phys_addr > paddr ||
			paddr + size - 1 > vm->phys_addr + vm->size - 1)
			continue;

		return svm;
	}

	return NULL;
}

struct static_vm *find_static_vm_vaddr(void *vaddr)
{
	struct static_vm *svm;
	struct vm_struct *vm;

	list_for_each_entry(svm, &static_vmlist, list) {
		vm = &svm->vm;

		/* static_vmlist is ascending order */
		if (vm->addr > vaddr)
			break;

		if (vm->addr <= vaddr && vm->addr + vm->size > vaddr)
			return svm;
	}

	return NULL;
}

void __init add_static_vm_early(struct static_vm *svm)
{
	struct static_vm *curr_svm;
	struct vm_struct *vm;
	void *vaddr;

	vm = &svm->vm;
	vm_area_add_early(vm);
	vaddr = vm->addr;

	list_for_each_entry(curr_svm, &static_vmlist, list) {
		vm = &curr_svm->vm;

		if (vm->addr > vaddr)
			break;
	}
	list_add_tail(&svm->list, &curr_svm->list);
}

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
ed8fd218 JK	42
	43	LIST_HEAD(static_vmlist);
	44
	45	static struct static_vm *find_static_vm_paddr(phys_addr_t paddr,
	46	size_t size, unsigned int mtype)
	47	{
	48	struct static_vm *svm;
	49	struct vm_struct *vm;
	50
	51	list_for_each_entry(svm, &static_vmlist, list) {
	52	vm = &svm->vm;
	53	if (!(vm->flags & VM_ARM_STATIC_MAPPING))
	54	continue;
	55	if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
	56	continue;
	57
	58	if (vm->phys_addr > paddr \|\|
	59	paddr + size - 1 > vm->phys_addr + vm->size - 1)
	60	continue;
	61
	62	return svm;
	63	}
	64
	65	return NULL;
	66	}
	67
	68	struct static_vm find_static_vm_vaddr(void vaddr)
	69	{
	70	struct static_vm *svm;
	71	struct vm_struct *vm;
	72
	73	list_for_each_entry(svm, &static_vmlist, list) {
	74	vm = &svm->vm;
	75
	76	/* static_vmlist is ascending order */
	77	if (vm->addr > vaddr)
	78	break;
	79
	80	if (vm->addr <= vaddr && vm->addr + vm->size > vaddr)
	81	return svm;
	82	}
	83
	84	return NULL;
	85	}
	86
	87	void __init add_static_vm_early(struct static_vm *svm)
	88	{
	89	struct static_vm *curr_svm;
	90	struct vm_struct *vm;
	91	void *vaddr;
	92
	93	vm = &svm->vm;
	94	vm_area_add_early(vm);
	95	vaddr = vm->addr;
	96
	97	list_for_each_entry(curr_svm, &static_vmlist, list) {
	98	vm = &curr_svm->vm;
	99
	100	if (vm->addr > vaddr)
	101	break;
	102	}
	103	list_add_tail(&svm->list, &curr_svm->list);
	104	}
	105
69d3a84a HD	106	int ioremap_page(unsigned long virt, unsigned long phys,
	107	const struct mem_type *mtype)
	108	{
d7461963 RK	109	return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
d7461963 RK	110	__pgprot(mtype->prot_pte));
69d3a84a HD	111	}
69d3a84a HD	112	EXPORT_SYMBOL(ioremap_page);
ff0daca5	113
3e99675a	114	void __check_vmalloc_seq(struct mm_struct *mm)
ff0daca5 RK	115	{
	116	unsigned int seq;
	117
	118	do {
3e99675a	119	seq = init_mm.context.vmalloc_seq;
ff0daca5 RK	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)));
3e99675a NP	124	mm->context.vmalloc_seq = seq;
3e99675a NP	125	} while (seq != init_mm.context.vmalloc_seq);
ff0daca5 RK	126	}
ff0daca5 RK	127
da028779	128	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
ff0daca5 RK	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	*
31aa8fd6 RK	136	* Note that get_vm_area_caller() allocates a guard 4K page, so we need to
31aa8fd6 RK	137	* mask the size back to 1MB aligned or we will overflow in the loop below.
ff0daca5 RK	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	142	pgd_t *pgd;
03a6b827 CM	143	pud_t *pud;
03a6b827 CM	144	pmd_t *pmdp;
ff0daca5 RK	145
	146	flush_cache_vunmap(addr, end);
	147	pgd = pgd_offset_k(addr);
03a6b827 CM	148	pud = pud_offset(pgd, addr);
03a6b827 CM	149	pmdp = pmd_offset(pud, addr);
ff0daca5	150	do {
03a6b827	151	pmd_t pmd = *pmdp;
ff0daca5	152
ff0daca5 RK	153	if (!pmd_none(pmd)) {
	154	/*
	155	* Clear the PMD from the page table, and
3e99675a	156	* increment the vmalloc sequence so others
ff0daca5 RK	157	* notice this change.
	158	*
	159	* Note: this is still racy on SMP machines.
	160	*/
	161	pmd_clear(pmdp);
3e99675a	162	init_mm.context.vmalloc_seq++;
ff0daca5 RK	163
	164	/*
	165	* Free the page table, if there was one.
	166	*/
	167	if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
5e541973	168	pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
ff0daca5 RK	169	}
ff0daca5 RK	170
03a6b827 CM	171	addr += PMD_SIZE;
03a6b827 CM	172	pmdp += 2;
ff0daca5 RK	173	} while (addr < end);
	174
	175	/*
	176	* Ensure that the active_mm is up to date - we want to
	177	* catch any use-after-iounmap cases.
	178	*/
3e99675a NP	179	if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)
3e99675a NP	180	__check_vmalloc_seq(current->active_mm);
ff0daca5 RK	181
	182	flush_tlb_kernel_range(virt, end);
	183	}
	184
	185	static int
	186	remap_area_sections(unsigned long virt, unsigned long pfn,
b29e9f5e	187	size_t size, const struct mem_type *type)
ff0daca5	188	{
b29e9f5e	189	unsigned long addr = virt, end = virt + size;
ff0daca5	190	pgd_t *pgd;
03a6b827 CM	191	pud_t *pud;
03a6b827 CM	192	pmd_t *pmd;
ff0daca5 RK	193
	194	/*
	195	* Remove and free any PTE-based mapping, and
	196	* sync the current kernel mapping.
	197	*/
	198	unmap_area_sections(virt, size);
	199
ff0daca5	200	pgd = pgd_offset_k(addr);
03a6b827 CM	201	pud = pud_offset(pgd, addr);
03a6b827 CM	202	pmd = pmd_offset(pud, addr);
ff0daca5	203	do {
b29e9f5e	204	pmd[0] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5	205	pfn += SZ_1M >> PAGE_SHIFT;
b29e9f5e	206	pmd[1] = __pmd(__pfn_to_phys(pfn) \| type->prot_sect);
ff0daca5 RK	207	pfn += SZ_1M >> PAGE_SHIFT;
	208	flush_pmd_entry(pmd);
	209
03a6b827 CM	210	addr += PMD_SIZE;
03a6b827 CM	211	pmd += 2;
ff0daca5 RK	212	} while (addr < end);
	213
	214	return 0;
	215	}
a069c896 LB	216
	217	static int
	218	remap_area_supersections(unsigned long virt, unsigned long pfn,
b29e9f5e	219	size_t size, const struct mem_type *type)
a069c896	220	{
b29e9f5e	221	unsigned long addr = virt, end = virt + size;
a069c896	222	pgd_t *pgd;
03a6b827 CM	223	pud_t *pud;
03a6b827 CM	224	pmd_t *pmd;
a069c896 LB	225
	226	/*
	227	* Remove and free any PTE-based mapping, and
	228	* sync the current kernel mapping.
	229	*/
	230	unmap_area_sections(virt, size);
	231
a069c896	232	pgd = pgd_offset_k(virt);
03a6b827 CM	233	pud = pud_offset(pgd, addr);
03a6b827 CM	234	pmd = pmd_offset(pud, addr);
a069c896 LB	235	do {
	236	unsigned long super_pmd_val, i;
	237
b29e9f5e RK	238	super_pmd_val = __pfn_to_phys(pfn) \| type->prot_sect \|
b29e9f5e RK	239	PMD_SECT_SUPER;
a069c896 LB	240	super_pmd_val \|= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
	241
	242	for (i = 0; i < 8; i++) {
a069c896 LB	243	pmd[0] = __pmd(super_pmd_val);
	244	pmd[1] = __pmd(super_pmd_val);
	245	flush_pmd_entry(pmd);
	246
03a6b827 CM	247	addr += PMD_SIZE;
03a6b827 CM	248	pmd += 2;
a069c896 LB	249	}
	250
	251	pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
	252	} while (addr < end);
	253
	254	return 0;
	255	}
ff0daca5 RK	256	#endif
ff0daca5 RK	257
31aa8fd6 RK	258	void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
31aa8fd6 RK	259	unsigned long offset, size_t size, unsigned int mtype, void *caller)
9d4ae727	260	{
b29e9f5e	261	const struct mem_type *type;
ff0daca5	262	int err;
9d4ae727 DS	263	unsigned long addr;
9d4ae727 DS	264	struct vm_struct * area;
a069c896	265
da028779	266	#ifndef CONFIG_ARM_LPAE
a069c896 LB	267	/*
	268	* High mappings must be supersection aligned
	269	*/
	270	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
	271	return NULL;
da028779	272	#endif
9d4ae727	273
3603ab2b RK	274	type = get_mem_type(mtype);
	275	if (!type)
	276	return NULL;
b29e9f5e	277
6d78b5f9 RK	278	/*
	279	* Page align the mapping size, taking account of any offset.
	280	*/
	281	size = PAGE_ALIGN(offset + size);
c924aff8	282
576d2f25 NP	283	/*
	284	* Try to reuse one of the static mapping whenever possible.
	285	*/
	286	read_lock(&vmlist_lock);
	287	for (area = vmlist; area; area = area->next) {
	288	if (!size \|\| (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
	289	break;
	290	if (!(area->flags & VM_ARM_STATIC_MAPPING))
	291	continue;
	292	if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
	293	continue;
	294	if (__phys_to_pfn(area->phys_addr) > pfn \|\|
97f10409	295	__pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
576d2f25 NP	296	continue;
	297	/* we can drop the lock here as we know area is static /
	298	read_unlock(&vmlist_lock);
	299	addr = (unsigned long)area->addr;
	300	addr += __pfn_to_phys(pfn) - area->phys_addr;
	301	return (void __iomem *) (offset + addr);
	302	}
	303	read_unlock(&vmlist_lock);
	304
	305	/*
	306	* Don't allow RAM to be mapped - this causes problems with ARMv6+
	307	*/
	308	if (WARN_ON(pfn_valid(pfn)))
	309	return NULL;
	310
31aa8fd6	311	area = get_vm_area_caller(size, VM_IOREMAP, caller);
9d4ae727 DS	312	if (!area)
	313	return NULL;
	314	addr = (unsigned long)area->addr;
a3d7193e	315	area->phys_addr = __pfn_to_phys(pfn);
ff0daca5	316
da028779	317	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
412489af CM	318	if (DOMAIN_IO == 0 &&
412489af CM	319	(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) \|\|
4a56c1e4	320	cpu_is_xsc3()) && pfn >= 0x100000 &&
a069c896 LB	321	!((__pfn_to_phys(pfn) \| size \| addr) & ~SUPERSECTION_MASK)) {
a069c896 LB	322	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	323	err = remap_area_supersections(addr, pfn, size, type);
a069c896	324	} else if (!((__pfn_to_phys(pfn) \| size \| addr) & ~PMD_MASK)) {
ff0daca5	325	area->flags \|= VM_ARM_SECTION_MAPPING;
b29e9f5e	326	err = remap_area_sections(addr, pfn, size, type);
ff0daca5 RK	327	} else
ff0daca5 RK	328	#endif
d7461963 RK	329	err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
d7461963 RK	330	__pgprot(type->prot_pte));
ff0daca5 RK	331
ff0daca5 RK	332	if (err) {
478922c2	333	vunmap((void *)addr);
9d4ae727 DS	334	return NULL;
9d4ae727 DS	335	}
ff0daca5 RK	336
	337	flush_cache_vmap(addr, addr + size);
	338	return (void __iomem *) (offset + addr);
9d4ae727	339	}
9d4ae727	340
31aa8fd6 RK	341	void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
31aa8fd6 RK	342	unsigned int mtype, void *caller)
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
31aa8fd6 RK	355	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
	356	caller);
	357	}
	358
	359	/*
	360	* Remap an arbitrary physical address space into the kernel virtual
	361	* address space. Needed when the kernel wants to access high addresses
	362	* directly.
	363	*
	364	* NOTE! We need to allow non-page-aligned mappings too: we will obviously
	365	* have to convert them into an offset in a page-aligned mapping, but the
	366	* caller shouldn't need to know that small detail.
	367	*/
	368	void __iomem *
	369	__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
	370	unsigned int mtype)
	371	{
	372	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
	373	__builtin_return_address(0));
	374	}
	375	EXPORT_SYMBOL(__arm_ioremap_pfn);
	376
4fe7ef3a RH	377	void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
	378	unsigned int, void *) =
	379	__arm_ioremap_caller;
	380
31aa8fd6 RK	381	void __iomem *
	382	__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
	383	{
4fe7ef3a RH	384	return arch_ioremap_caller(phys_addr, size, mtype,
4fe7ef3a RH	385	__builtin_return_address(0));
1da177e4	386	}
3603ab2b	387	EXPORT_SYMBOL(__arm_ioremap);
1da177e4	388
6c5482d5 TL	389	/*
	390	* Remap an arbitrary physical address space into the kernel virtual
	391	* address space as memory. Needed when the kernel wants to execute
	392	* code in external memory. This is needed for reprogramming source
	393	* clocks that would affect normal memory for example. Please see
	394	* CONFIG_GENERIC_ALLOCATOR for allocating external memory.
	395	*/
	396	void __iomem *
	397	__arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached)
	398	{
	399	unsigned int mtype;
	400
	401	if (cached)
	402	mtype = MT_MEMORY;
	403	else
	404	mtype = MT_MEMORY_NONCACHED;
	405
	406	return __arm_ioremap_caller(phys_addr, size, mtype,
	407	__builtin_return_address(0));
	408	}
	409
09d9bae0	410	void __iounmap(volatile void __iomem *io_addr)
1da177e4	411	{
09d9bae0	412	void addr = (void )(PAGE_MASK & (unsigned long)io_addr);
6ee723a6	413	struct vm_struct *vm;
ff0daca5	414
6ee723a6 NP	415	read_lock(&vmlist_lock);
6ee723a6 NP	416	for (vm = vmlist; vm; vm = vm->next) {
576d2f25	417	if (vm->addr > addr)
ff0daca5	418	break;
576d2f25 NP	419	if (!(vm->flags & VM_IOREMAP))
	420	continue;
	421	/* If this is a static mapping we must leave it alone */
	422	if ((vm->flags & VM_ARM_STATIC_MAPPING) &&
	423	(vm->addr <= addr) && (vm->addr + vm->size > addr)) {
	424	read_unlock(&vmlist_lock);
	425	return;
ff0daca5	426	}
6ae25a5b	427	#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
576d2f25 NP	428	/*
	429	* If this is a section based mapping we need to handle it
	430	* specially as the VM subsystem does not know how to handle
	431	* such a beast.
	432	*/
	433	if ((vm->addr == addr) &&
	434	(vm->flags & VM_ARM_SECTION_MAPPING)) {
	435	unmap_area_sections((unsigned long)vm->addr, vm->size);
	436	break;
	437	}
	438	#endif
ff0daca5	439	}
6ee723a6	440	read_unlock(&vmlist_lock);
ff0daca5	441
24f11ec0	442	vunmap(addr);
1da177e4	443	}
4fe7ef3a RH	444
	445	void (arch_iounmap)(volatile void __iomem ) = __iounmap;
	446
	447	void __arm_iounmap(volatile void __iomem *io_addr)
	448	{
	449	arch_iounmap(io_addr);
	450	}
	451	EXPORT_SYMBOL(__arm_iounmap);
c2794437 RH	452
	453	#ifdef CONFIG_PCI
	454	int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
	455	{
	456	BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
	457
	458	return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
	459	PCI_IO_VIRT_BASE + offset + SZ_64K,
	460	phys_addr,
	461	__pgprot(get_mem_type(MT_DEVICE)->prot_pte));
	462	}
	463	EXPORT_SYMBOL_GPL(pci_ioremap_io);
	464	#endif