2005-04-16 22:20:36 +00:00
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/*
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* linux/arch/arm/mm/ioremap.c
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*
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* Re-map IO memory to kernel address space so that we can access it.
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*
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* Hacked for ARM by Phil Blundell <philb@gnu.org>
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* Hacked to allow all architectures to build, and various cleanups
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* by Russell King
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*
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* This allows a driver to remap an arbitrary region of bus memory into
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* virtual space. One should *only* use readl, writel, memcpy_toio and
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* so on with such remapped areas.
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*
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* Because the ARM only has a 32-bit address space we can't address the
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* whole of the (physical) PCI space at once. PCI huge-mode addressing
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* allows us to circumvent this restriction by splitting PCI space into
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* two 2GB chunks and mapping only one at a time into processor memory.
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* We use MMU protection domains to trap any attempt to access the bank
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* that is not currently mapped. (This isn't fully implemented yet.)
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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2006-06-29 19:17:15 +00:00
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/tlbflush.h>
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2006-06-29 19:17:15 +00:00
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#include <asm/sizes.h>
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2007-04-21 09:47:29 +00:00
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#include <asm/mach/map.h>
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#include "mm.h"
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2006-06-29 19:17:15 +00:00
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/*
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2006-07-01 18:58:20 +00:00
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* Used by ioremap() and iounmap() code to mark (super)section-mapped
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* I/O regions in vm_struct->flags field.
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2006-06-29 19:17:15 +00:00
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*/
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#define VM_ARM_SECTION_MAPPING 0x80000000
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2005-04-16 22:20:36 +00:00
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2006-12-13 14:35:58 +00:00
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static int remap_area_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
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2007-04-21 09:47:29 +00:00
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unsigned long phys_addr, const struct mem_type *type)
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2005-04-16 22:20:36 +00:00
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{
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2007-04-21 09:47:29 +00:00
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pgprot_t prot = __pgprot(type->prot_pte);
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2006-12-13 14:35:58 +00:00
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pte_t *pte;
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pte = pte_alloc_kernel(pmd, addr);
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if (!pte)
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return -ENOMEM;
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2005-04-16 22:20:36 +00:00
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do {
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if (!pte_none(*pte))
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goto bad;
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2007-04-21 09:52:32 +00:00
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set_pte_ext(pte, pfn_pte(phys_addr >> PAGE_SHIFT, prot),
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type->prot_pte_ext);
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2005-04-16 22:20:36 +00:00
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phys_addr += PAGE_SIZE;
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2006-12-13 14:35:58 +00:00
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} while (pte++, addr += PAGE_SIZE, addr != end);
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return 0;
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2005-04-16 22:20:36 +00:00
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bad:
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2006-12-13 14:35:58 +00:00
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printk(KERN_CRIT "remap_area_pte: page already exists\n");
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2005-04-16 22:20:36 +00:00
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BUG();
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}
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2006-12-13 14:35:58 +00:00
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static inline int remap_area_pmd(pgd_t *pgd, unsigned long addr,
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unsigned long end, unsigned long phys_addr,
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2007-04-21 09:47:29 +00:00
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const struct mem_type *type)
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2005-04-16 22:20:36 +00:00
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{
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2006-12-13 14:35:58 +00:00
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unsigned long next;
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pmd_t *pmd;
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int ret = 0;
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2005-04-16 22:20:36 +00:00
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2006-12-13 14:35:58 +00:00
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pmd = pmd_alloc(&init_mm, pgd, addr);
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if (!pmd)
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return -ENOMEM;
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2005-04-16 22:20:36 +00:00
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do {
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2006-12-13 14:35:58 +00:00
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next = pmd_addr_end(addr, end);
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2007-04-21 09:47:29 +00:00
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ret = remap_area_pte(pmd, addr, next, phys_addr, type);
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2006-12-13 14:35:58 +00:00
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if (ret)
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return ret;
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phys_addr += next - addr;
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} while (pmd++, addr = next, addr != end);
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return ret;
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2005-04-16 22:20:36 +00:00
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}
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2006-12-13 14:35:58 +00:00
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static int remap_area_pages(unsigned long start, unsigned long pfn,
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2007-04-21 09:47:29 +00:00
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size_t size, const struct mem_type *type)
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2005-04-16 22:20:36 +00:00
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{
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2006-12-13 14:35:58 +00:00
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unsigned long addr = start;
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unsigned long next, end = start + size;
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2006-01-09 19:23:11 +00:00
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unsigned long phys_addr = __pfn_to_phys(pfn);
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2006-12-13 14:35:58 +00:00
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pgd_t *pgd;
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2005-04-16 22:20:36 +00:00
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int err = 0;
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2006-12-13 14:35:58 +00:00
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BUG_ON(addr >= end);
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pgd = pgd_offset_k(addr);
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2005-04-16 22:20:36 +00:00
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do {
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2006-12-13 14:35:58 +00:00
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next = pgd_addr_end(addr, end);
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2007-04-21 09:47:29 +00:00
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err = remap_area_pmd(pgd, addr, next, phys_addr, type);
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2006-12-13 14:35:58 +00:00
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if (err)
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2005-04-16 22:20:36 +00:00
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break;
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2006-12-13 14:35:58 +00:00
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phys_addr += next - addr;
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} while (pgd++, addr = next, addr != end);
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2005-04-16 22:20:36 +00:00
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return err;
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}
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2006-06-29 19:17:15 +00:00
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void __check_kvm_seq(struct mm_struct *mm)
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{
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unsigned int seq;
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do {
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seq = init_mm.context.kvm_seq;
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memcpy(pgd_offset(mm, VMALLOC_START),
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pgd_offset_k(VMALLOC_START),
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sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
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pgd_index(VMALLOC_START)));
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mm->context.kvm_seq = seq;
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} while (seq != init_mm.context.kvm_seq);
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}
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#ifndef CONFIG_SMP
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/*
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* Section support is unsafe on SMP - If you iounmap and ioremap a region,
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* the other CPUs will not see this change until their next context switch.
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* Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
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* which requires the new ioremap'd region to be referenced, the CPU will
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* reference the _old_ region.
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*
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* Note that get_vm_area() allocates a guard 4K page, so we need to mask
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* the size back to 1MB aligned or we will overflow in the loop below.
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*/
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static void unmap_area_sections(unsigned long virt, unsigned long size)
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{
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unsigned long addr = virt, end = virt + (size & ~SZ_1M);
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pgd_t *pgd;
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flush_cache_vunmap(addr, end);
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pgd = pgd_offset_k(addr);
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do {
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pmd_t pmd, *pmdp = pmd_offset(pgd, addr);
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pmd = *pmdp;
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if (!pmd_none(pmd)) {
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/*
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* Clear the PMD from the page table, and
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* increment the kvm sequence so others
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* notice this change.
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*
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* Note: this is still racy on SMP machines.
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*/
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pmd_clear(pmdp);
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init_mm.context.kvm_seq++;
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/*
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* Free the page table, if there was one.
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*/
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if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
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2006-09-26 06:31:48 +00:00
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pte_free_kernel(pmd_page_vaddr(pmd));
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2006-06-29 19:17:15 +00:00
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}
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addr += PGDIR_SIZE;
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pgd++;
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} while (addr < end);
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/*
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* Ensure that the active_mm is up to date - we want to
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* catch any use-after-iounmap cases.
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*/
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if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
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__check_kvm_seq(current->active_mm);
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flush_tlb_kernel_range(virt, end);
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}
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static int
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remap_area_sections(unsigned long virt, unsigned long pfn,
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2007-04-21 09:47:29 +00:00
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size_t size, const struct mem_type *type)
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2006-06-29 19:17:15 +00:00
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{
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2007-04-21 09:47:29 +00:00
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unsigned long addr = virt, end = virt + size;
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2006-06-29 19:17:15 +00:00
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pgd_t *pgd;
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/*
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* Remove and free any PTE-based mapping, and
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* sync the current kernel mapping.
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*/
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unmap_area_sections(virt, size);
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pgd = pgd_offset_k(addr);
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do {
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pmd_t *pmd = pmd_offset(pgd, addr);
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2007-04-21 09:47:29 +00:00
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pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
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2006-06-29 19:17:15 +00:00
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pfn += SZ_1M >> PAGE_SHIFT;
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2007-04-21 09:47:29 +00:00
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pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
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2006-06-29 19:17:15 +00:00
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pfn += SZ_1M >> PAGE_SHIFT;
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flush_pmd_entry(pmd);
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addr += PGDIR_SIZE;
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pgd++;
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} while (addr < end);
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return 0;
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}
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2006-07-01 18:58:20 +00:00
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static int
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remap_area_supersections(unsigned long virt, unsigned long pfn,
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2007-04-21 09:47:29 +00:00
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size_t size, const struct mem_type *type)
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2006-07-01 18:58:20 +00:00
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{
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2007-04-21 09:47:29 +00:00
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unsigned long addr = virt, end = virt + size;
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2006-07-01 18:58:20 +00:00
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pgd_t *pgd;
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/*
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* Remove and free any PTE-based mapping, and
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* sync the current kernel mapping.
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*/
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unmap_area_sections(virt, size);
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pgd = pgd_offset_k(virt);
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do {
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unsigned long super_pmd_val, i;
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2007-04-21 09:47:29 +00:00
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super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
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PMD_SECT_SUPER;
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2006-07-01 18:58:20 +00:00
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super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
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for (i = 0; i < 8; i++) {
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pmd_t *pmd = pmd_offset(pgd, addr);
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pmd[0] = __pmd(super_pmd_val);
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pmd[1] = __pmd(super_pmd_val);
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flush_pmd_entry(pmd);
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addr += PGDIR_SIZE;
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pgd++;
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}
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pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
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} while (addr < end);
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return 0;
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}
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2006-06-29 19:17:15 +00:00
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#endif
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2005-04-16 22:20:36 +00:00
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space. Needed when the kernel wants to access high addresses
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* directly.
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*
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* NOTE! We need to allow non-page-aligned mappings too: we will obviously
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* have to convert them into an offset in a page-aligned mapping, but the
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* caller shouldn't need to know that small detail.
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*
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* 'flags' are the extra L_PTE_ flags that you want to specify for this
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* mapping. See include/asm-arm/proc-armv/pgtable.h for more information.
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*/
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2006-01-09 19:23:11 +00:00
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void __iomem *
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__ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
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unsigned long flags)
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{
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2007-04-21 09:47:29 +00:00
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const struct mem_type *type;
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struct mem_type t;
|
2006-06-29 19:17:15 +00:00
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int err;
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2006-01-09 19:23:11 +00:00
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unsigned long addr;
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struct vm_struct * area;
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2006-07-01 18:58:20 +00:00
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/*
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* High mappings must be supersection aligned
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*/
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if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
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return NULL;
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2006-01-09 19:23:11 +00:00
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2007-04-21 09:47:29 +00:00
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t = *get_mem_type(MT_DEVICE);
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t.prot_sect |= flags;
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t.prot_pte |= flags;
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type = &t;
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|
2006-12-17 23:29:57 +00:00
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size = PAGE_ALIGN(size);
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|
2006-01-09 19:23:11 +00:00
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area = get_vm_area(size, VM_IOREMAP);
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if (!area)
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return NULL;
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addr = (unsigned long)area->addr;
|
2006-06-29 19:17:15 +00:00
|
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#ifndef CONFIG_SMP
|
2007-01-25 13:16:47 +00:00
|
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if (DOMAIN_IO == 0 &&
|
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|
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(((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
|
2007-04-21 09:16:48 +00:00
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cpu_is_xsc3()) && pfn >= 0x100000 &&
|
2006-07-01 18:58:20 +00:00
|
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!((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
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area->flags |= VM_ARM_SECTION_MAPPING;
|
2007-04-21 09:47:29 +00:00
|
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|
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
|
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area->flags |= VM_ARM_SECTION_MAPPING;
|
2007-04-21 09:47:29 +00:00
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|
err = remap_area_sections(addr, pfn, size, type);
|
2006-06-29 19:17:15 +00:00
|
|
|
} else
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#endif
|
2007-04-21 09:47:29 +00:00
|
|
|
err = remap_area_pages(addr, pfn, size, type);
|
2006-06-29 19:17:15 +00:00
|
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|
|
if (err) {
|
2006-05-16 10:30:26 +00:00
|
|
|
vunmap((void *)addr);
|
2006-01-09 19:23:11 +00:00
|
|
|
return NULL;
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|
|
|
}
|
2006-06-29 19:17:15 +00:00
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|
|
|
|
flush_cache_vmap(addr, addr + size);
|
|
|
|
return (void __iomem *) (offset + addr);
|
2006-01-09 19:23:11 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__ioremap_pfn);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
void __iomem *
|
2005-11-17 16:48:00 +00:00
|
|
|
__ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
|
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;
|
|
|
|
|
|
|
|
/*
|
2006-01-09 19:23:11 +00:00
|
|
|
* Page align the mapping size
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
|
|
|
size = PAGE_ALIGN(last_addr + 1) - phys_addr;
|
|
|
|
|
2006-01-09 19:23:11 +00:00
|
|
|
return __ioremap_pfn(pfn, offset, size, flags);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__ioremap);
|
|
|
|
|
2006-10-09 01:09:49 +00:00
|
|
|
void __iounmap(volatile void __iomem *addr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-07-29 07:29:30 +00:00
|
|
|
#ifndef CONFIG_SMP
|
2006-06-29 19:17:15 +00:00
|
|
|
struct vm_struct **p, *tmp;
|
2006-07-29 07:29:30 +00:00
|
|
|
#endif
|
2006-06-29 19:17:15 +00:00
|
|
|
unsigned int section_mapping = 0;
|
|
|
|
|
2006-10-09 01:09:49 +00:00
|
|
|
addr = (volatile void __iomem *)(PAGE_MASK & (unsigned long)addr);
|
2006-06-29 19:17:15 +00:00
|
|
|
|
2006-07-03 11:26:02 +00:00
|
|
|
#ifndef CONFIG_SMP
|
2006-06-29 19:17:15 +00:00
|
|
|
/*
|
|
|
|
* 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);
|
2006-07-03 11:26:02 +00:00
|
|
|
#endif
|
2006-06-29 19:17:15 +00:00
|
|
|
|
|
|
|
if (!section_mapping)
|
2006-10-09 01:09:49 +00:00
|
|
|
vunmap((void __force *)addr);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__iounmap);
|