forked from luck/tmp_suning_uos_patched
b2d6b9fb35
Signed-off-by: Helge Deller <deller@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
197 lines
4.1 KiB
C
197 lines
4.1 KiB
C
/*
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* arch/parisc/mm/ioremap.c
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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* (C) Copyright 2001-2006 Helge Deller <deller@gmx.de>
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* (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
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*/
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#include <linux/vmalloc.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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static inline void
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remap_area_pte(pte_t *pte, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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{
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unsigned long end, pfn;
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pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
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_PAGE_ACCESSED | flags);
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address &= ~PMD_MASK;
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end = address + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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BUG_ON(address >= end);
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pfn = phys_addr >> PAGE_SHIFT;
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do {
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BUG_ON(!pte_none(*pte));
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set_pte(pte, pfn_pte(pfn, pgprot));
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address += PAGE_SIZE;
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pfn++;
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pte++;
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} while (address && (address < end));
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}
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static inline int
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remap_area_pmd(pmd_t *pmd, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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{
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unsigned long end;
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address &= ~PGDIR_MASK;
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end = address + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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BUG_ON(address >= end);
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phys_addr -= address;
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do {
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pte_t *pte = pte_alloc_kernel(pmd, address);
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if (!pte)
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return -ENOMEM;
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remap_area_pte(pte, address, end - address,
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address + phys_addr, flags);
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address = (address + PMD_SIZE) & PMD_MASK;
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pmd++;
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} while (address && (address < end));
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return 0;
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}
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static int
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remap_area_pages(unsigned long address, unsigned long phys_addr,
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unsigned long size, unsigned long flags)
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{
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pgd_t *dir;
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int error = 0;
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unsigned long end = address + size;
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BUG_ON(address >= end);
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phys_addr -= address;
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dir = pgd_offset_k(address);
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flush_cache_all();
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do {
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pud_t *pud;
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pmd_t *pmd;
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error = -ENOMEM;
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pud = pud_alloc(&init_mm, dir, address);
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if (!pud)
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break;
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pmd = pmd_alloc(&init_mm, pud, address);
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if (!pmd)
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break;
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if (remap_area_pmd(pmd, address, end - address,
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phys_addr + address, flags))
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break;
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error = 0;
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address = (address + PGDIR_SIZE) & PGDIR_MASK;
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dir++;
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} while (address && (address < end));
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flush_tlb_all();
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return error;
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}
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/*
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* Generic mapping function (not visible outside):
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*/
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space.
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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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void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
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{
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void *addr;
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struct vm_struct *area;
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unsigned long offset, last_addr;
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#ifdef CONFIG_EISA
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unsigned long end = phys_addr + size - 1;
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/* Support EISA addresses */
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if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
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(phys_addr >= 0x00500000 && end < 0x03bfffff)) {
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phys_addr |= F_EXTEND(0xfc000000);
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flags |= _PAGE_NO_CACHE;
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}
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#endif
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/* Don't allow wraparound or zero size */
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last_addr = phys_addr + size - 1;
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if (!size || last_addr < phys_addr)
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return NULL;
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/*
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* Don't allow anybody to remap normal RAM that we're using..
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*/
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if (phys_addr < virt_to_phys(high_memory)) {
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char *t_addr, *t_end;
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struct page *page;
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t_addr = __va(phys_addr);
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t_end = t_addr + (size - 1);
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for (page = virt_to_page(t_addr);
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page <= virt_to_page(t_end); page++) {
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if(!PageReserved(page))
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return NULL;
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}
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}
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/*
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* Mappings have to be page-aligned
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*/
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offset = phys_addr & ~PAGE_MASK;
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phys_addr &= PAGE_MASK;
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size = PAGE_ALIGN(last_addr) - phys_addr;
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/*
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* Ok, go for it..
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*/
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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 = area->addr;
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if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
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vfree(addr);
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return NULL;
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}
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return (void __iomem *) (offset + (char *)addr);
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}
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EXPORT_SYMBOL(__ioremap);
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void iounmap(void __iomem *addr)
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{
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if (addr > high_memory)
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return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
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}
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EXPORT_SYMBOL(iounmap);
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