2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* 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>
|
2008-09-06 11:10:45 +00:00
|
|
|
#include <linux/io.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-08-10 17:08:10 +00:00
|
|
|
#include <asm/cputype.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <asm/cacheflush.h>
|
2006-06-29 19:17:15 +00:00
|
|
|
#include <asm/mmu_context.h>
|
|
|
|
#include <asm/pgalloc.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
#include <asm/tlbflush.h>
|
2006-06-29 19:17:15 +00:00
|
|
|
#include <asm/sizes.h>
|
|
|
|
|
2007-04-21 09:47:29 +00:00
|
|
|
#include <asm/mach/map.h>
|
|
|
|
#include "mm.h"
|
|
|
|
|
2009-01-28 19:32:08 +00:00
|
|
|
int ioremap_page(unsigned long virt, unsigned long phys,
|
|
|
|
const struct mem_type *mtype)
|
|
|
|
{
|
2010-07-26 09:29:13 +00:00
|
|
|
return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
|
|
|
|
__pgprot(mtype->prot_pte));
|
2009-01-28 19:32:08 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(ioremap_page);
|
2006-06-29 19:17:15 +00:00
|
|
|
|
|
|
|
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.
|
|
|
|
*
|
2009-12-18 11:10:03 +00:00
|
|
|
* 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.
|
2006-06-29 19:17:15 +00:00
|
|
|
*/
|
|
|
|
static void unmap_area_sections(unsigned long virt, unsigned long size)
|
|
|
|
{
|
2009-01-25 17:36:34 +00:00
|
|
|
unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
|
2006-06-29 19:17:15 +00:00
|
|
|
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)
|
2008-02-05 06:29:14 +00:00
|
|
|
pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
|
2006-06-29 19:17:15 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
2007-04-21 09:47:29 +00:00
|
|
|
size_t size, const struct mem_type *type)
|
2006-06-29 19:17:15 +00:00
|
|
|
{
|
2007-04-21 09:47:29 +00:00
|
|
|
unsigned long addr = virt, end = virt + size;
|
2006-06-29 19:17:15 +00:00
|
|
|
pgd_t *pgd;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove and free any PTE-based mapping, and
|
|
|
|
* sync the current kernel mapping.
|
|
|
|
*/
|
|
|
|
unmap_area_sections(virt, size);
|
|
|
|
|
|
|
|
pgd = pgd_offset_k(addr);
|
|
|
|
do {
|
|
|
|
pmd_t *pmd = pmd_offset(pgd, addr);
|
|
|
|
|
2007-04-21 09:47:29 +00:00
|
|
|
pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
|
2006-06-29 19:17:15 +00:00
|
|
|
pfn += SZ_1M >> PAGE_SHIFT;
|
2007-04-21 09:47:29 +00:00
|
|
|
pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
|
2006-06-29 19:17:15 +00:00
|
|
|
pfn += SZ_1M >> PAGE_SHIFT;
|
|
|
|
flush_pmd_entry(pmd);
|
|
|
|
|
|
|
|
addr += PGDIR_SIZE;
|
|
|
|
pgd++;
|
|
|
|
} while (addr < end);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2006-07-01 18:58:20 +00:00
|
|
|
|
|
|
|
static int
|
|
|
|
remap_area_supersections(unsigned long virt, unsigned long pfn,
|
2007-04-21 09:47:29 +00:00
|
|
|
size_t size, const struct mem_type *type)
|
2006-07-01 18:58:20 +00:00
|
|
|
{
|
2007-04-21 09:47:29 +00:00
|
|
|
unsigned long addr = virt, end = virt + size;
|
2006-07-01 18:58:20 +00:00
|
|
|
pgd_t *pgd;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove and free any PTE-based mapping, and
|
|
|
|
* sync the current kernel mapping.
|
|
|
|
*/
|
|
|
|
unmap_area_sections(virt, size);
|
|
|
|
|
|
|
|
pgd = pgd_offset_k(virt);
|
|
|
|
do {
|
|
|
|
unsigned long super_pmd_val, i;
|
|
|
|
|
2007-04-21 09:47:29 +00:00
|
|
|
super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
|
|
|
|
PMD_SECT_SUPER;
|
2006-07-01 18:58:20 +00:00
|
|
|
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;
|
|
|
|
}
|
2006-06-29 19:17:15 +00:00
|
|
|
#endif
|
|
|
|
|
2009-12-18 11:10:03 +00:00
|
|
|
void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
|
|
|
|
unsigned long offset, size_t size, unsigned int mtype, void *caller)
|
2006-01-09 19:23:11 +00:00
|
|
|
{
|
2007-04-21 09:47:29 +00:00
|
|
|
const struct mem_type *type;
|
2006-06-29 19:17:15 +00:00
|
|
|
int err;
|
2006-01-09 19:23:11 +00:00
|
|
|
unsigned long addr;
|
|
|
|
struct vm_struct * area;
|
2006-07-01 18:58:20 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* High mappings must be supersection aligned
|
|
|
|
*/
|
|
|
|
if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
|
|
|
|
return NULL;
|
2006-01-09 19:23:11 +00:00
|
|
|
|
2007-05-05 19:59:27 +00:00
|
|
|
type = get_mem_type(mtype);
|
|
|
|
if (!type)
|
|
|
|
return NULL;
|
2007-04-21 09:47:29 +00:00
|
|
|
|
2007-06-03 18:26:04 +00:00
|
|
|
/*
|
|
|
|
* Page align the mapping size, taking account of any offset.
|
|
|
|
*/
|
|
|
|
size = PAGE_ALIGN(offset + size);
|
2006-12-17 23:29:57 +00:00
|
|
|
|
2011-09-16 05:14:23 +00:00
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
|
2009-12-18 11:10:03 +00:00
|
|
|
area = get_vm_area_caller(size, VM_IOREMAP, caller);
|
2006-01-09 19:23:11 +00:00
|
|
|
if (!area)
|
|
|
|
return NULL;
|
|
|
|
addr = (unsigned long)area->addr;
|
2006-06-29 19:17:15 +00:00
|
|
|
|
|
|
|
#ifndef CONFIG_SMP
|
2007-01-25 13:16:47 +00:00
|
|
|
if (DOMAIN_IO == 0 &&
|
|
|
|
(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
|
2007-04-21 09:16:48 +00:00
|
|
|
cpu_is_xsc3()) && pfn >= 0x100000 &&
|
2006-07-01 18:58:20 +00:00
|
|
|
!((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
|
|
|
|
area->flags |= VM_ARM_SECTION_MAPPING;
|
2007-04-21 09:47:29 +00:00
|
|
|
err = remap_area_supersections(addr, pfn, size, type);
|
2006-07-01 18:58:20 +00:00
|
|
|
} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
|
2006-06-29 19:17:15 +00:00
|
|
|
area->flags |= VM_ARM_SECTION_MAPPING;
|
2007-04-21 09:47:29 +00:00
|
|
|
err = remap_area_sections(addr, pfn, size, type);
|
2006-06-29 19:17:15 +00:00
|
|
|
} else
|
|
|
|
#endif
|
2010-07-26 09:29:13 +00:00
|
|
|
err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
|
|
|
|
__pgprot(type->prot_pte));
|
2006-06-29 19:17:15 +00:00
|
|
|
|
|
|
|
if (err) {
|
2006-05-16 10:30:26 +00:00
|
|
|
vunmap((void *)addr);
|
2006-01-09 19:23:11 +00:00
|
|
|
return NULL;
|
|
|
|
}
|
2006-06-29 19:17:15 +00:00
|
|
|
|
|
|
|
flush_cache_vmap(addr, addr + size);
|
|
|
|
return (void __iomem *) (offset + addr);
|
2006-01-09 19:23:11 +00:00
|
|
|
}
|
|
|
|
|
2009-12-18 11:10:03 +00:00
|
|
|
void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
|
|
|
|
unsigned int mtype, void *caller)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-01-09 19:23:11 +00:00
|
|
|
unsigned long last_addr;
|
|
|
|
unsigned long offset = phys_addr & ~PAGE_MASK;
|
|
|
|
unsigned long pfn = __phys_to_pfn(phys_addr);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-01-09 19:23:11 +00:00
|
|
|
/*
|
|
|
|
* Don't allow wraparound or zero size
|
|
|
|
*/
|
2005-04-16 22:20:36 +00:00
|
|
|
last_addr = phys_addr + size - 1;
|
|
|
|
if (!size || last_addr < phys_addr)
|
|
|
|
return NULL;
|
|
|
|
|
2009-12-18 11:10:03 +00:00
|
|
|
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));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2007-05-05 19:59:27 +00:00
|
|
|
EXPORT_SYMBOL(__arm_ioremap);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-10-12 00:02:50 +00:00
|
|
|
/*
|
|
|
|
* 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));
|
|
|
|
}
|
|
|
|
|
2008-09-05 13:08:44 +00:00
|
|
|
void __iounmap(volatile void __iomem *io_addr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2008-09-05 13:08:44 +00:00
|
|
|
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
|
2011-09-16 02:12:19 +00:00
|
|
|
struct vm_struct *vm;
|
2006-06-29 19:17:15 +00:00
|
|
|
|
2011-09-16 02:12:19 +00:00
|
|
|
read_lock(&vmlist_lock);
|
|
|
|
for (vm = vmlist; vm; vm = vm->next) {
|
2011-09-16 05:14:23 +00:00
|
|
|
if (vm->addr > addr)
|
2006-06-29 19:17:15 +00:00
|
|
|
break;
|
2011-09-16 05:14:23 +00:00
|
|
|
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;
|
2006-06-29 19:17:15 +00:00
|
|
|
}
|
2011-09-16 05:14:23 +00:00
|
|
|
#ifndef CONFIG_SMP
|
|
|
|
/*
|
|
|
|
* 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
|
2006-06-29 19:17:15 +00:00
|
|
|
}
|
2011-09-16 02:12:19 +00:00
|
|
|
read_unlock(&vmlist_lock);
|
2006-06-29 19:17:15 +00:00
|
|
|
|
2009-01-25 17:36:34 +00:00
|
|
|
vunmap(addr);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__iounmap);
|