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119 lines
3.1 KiB
119 lines
3.1 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* (C) Copyright 1995 1996 Linus Torvalds |
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* (C) Copyright 2001, 2002 Ralf Baechle |
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*/ |
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#include <linux/export.h> |
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#include <asm/addrspace.h> |
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#include <asm/byteorder.h> |
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#include <linux/ioport.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/vmalloc.h> |
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#include <linux/mm_types.h> |
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#include <linux/io.h> |
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#include <asm/cacheflush.h> |
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#include <asm/tlbflush.h> |
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#include <ioremap.h> |
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#define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL)) |
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#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1) |
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static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages, |
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void *arg) |
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{ |
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unsigned long i; |
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for (i = 0; i < nr_pages; i++) { |
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if (pfn_valid(start_pfn + i) && |
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!PageReserved(pfn_to_page(start_pfn + i))) |
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return 1; |
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} |
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return 0; |
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} |
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/* |
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* ioremap_prot - map bus memory into CPU space |
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* @phys_addr: bus address of the memory |
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* @size: size of the resource to map |
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* |
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* ioremap_prot gives the caller control over cache coherency attributes (CCA) |
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*/ |
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void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size, |
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unsigned long prot_val) |
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{ |
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unsigned long flags = prot_val & _CACHE_MASK; |
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unsigned long offset, pfn, last_pfn; |
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struct vm_struct *area; |
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phys_addr_t last_addr; |
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unsigned long vaddr; |
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void __iomem *cpu_addr; |
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cpu_addr = plat_ioremap(phys_addr, size, flags); |
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if (cpu_addr) |
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return cpu_addr; |
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phys_addr = fixup_bigphys_addr(phys_addr, size); |
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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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* Map uncached objects in the low 512mb of address space using KSEG1, |
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* otherwise map using page tables. |
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*/ |
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if (IS_LOW512(phys_addr) && IS_LOW512(last_addr) && |
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flags == _CACHE_UNCACHED) |
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return (void __iomem *) CKSEG1ADDR(phys_addr); |
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/* |
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* Don't allow anybody to remap RAM that may be allocated by the page |
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* allocator, since that could lead to races & data clobbering. |
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*/ |
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pfn = PFN_DOWN(phys_addr); |
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last_pfn = PFN_DOWN(last_addr); |
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if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL, |
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__ioremap_check_ram) == 1) { |
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WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n", |
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&phys_addr, &last_addr); |
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return NULL; |
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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 + 1) - 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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vaddr = (unsigned long)area->addr; |
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flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE; |
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if (ioremap_page_range(vaddr, vaddr + size, phys_addr, |
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__pgprot(flags))) { |
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free_vm_area(area); |
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return NULL; |
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} |
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return (void __iomem *)(vaddr + offset); |
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} |
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EXPORT_SYMBOL(ioremap_prot); |
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void iounmap(const volatile void __iomem *addr) |
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{ |
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if (!plat_iounmap(addr) && !IS_KSEG1(addr)) |
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vunmap((void *)((unsigned long)addr & PAGE_MASK)); |
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} |
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EXPORT_SYMBOL(iounmap);
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