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Linux/arch/mips/mm/ioremap.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * (C) Copyright 1995 1996 Linus Torvalds
  7  * (C) Copyright 2001, 2002 Ralf Baechle
  8  */
  9 #include <linux/export.h>
 10 #include <asm/addrspace.h>
 11 #include <asm/byteorder.h>
 12 #include <linux/ioport.h>
 13 #include <linux/sched.h>
 14 #include <linux/slab.h>
 15 #include <linux/vmalloc.h>
 16 #include <linux/mm_types.h>
 17 #include <linux/io.h>
 18 #include <asm/cacheflush.h>
 19 #include <asm/tlbflush.h>
 20 #include <ioremap.h>
 21 
 22 #define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL))
 23 #define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
 24 
 25 static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
 26                                void *arg)
 27 {
 28         unsigned long i;
 29 
 30         for (i = 0; i < nr_pages; i++) {
 31                 if (pfn_valid(start_pfn + i) &&
 32                     !PageReserved(pfn_to_page(start_pfn + i)))
 33                         return 1;
 34         }
 35 
 36         return 0;
 37 }
 38 
 39 /*
 40  * ioremap_prot     -   map bus memory into CPU space
 41  * @phys_addr:    bus address of the memory
 42  * @size:      size of the resource to map
 43  *
 44  * ioremap_prot gives the caller control over cache coherency attributes (CCA)
 45  */
 46 void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
 47                 unsigned long prot_val)
 48 {
 49         unsigned long flags = prot_val & _CACHE_MASK;
 50         unsigned long offset, pfn, last_pfn;
 51         struct vm_struct *area;
 52         phys_addr_t last_addr;
 53         unsigned long vaddr;
 54         void __iomem *cpu_addr;
 55 
 56         cpu_addr = plat_ioremap(phys_addr, size, flags);
 57         if (cpu_addr)
 58                 return cpu_addr;
 59 
 60         phys_addr = fixup_bigphys_addr(phys_addr, size);
 61 
 62         /* Don't allow wraparound or zero size */
 63         last_addr = phys_addr + size - 1;
 64         if (!size || last_addr < phys_addr)
 65                 return NULL;
 66 
 67         /*
 68          * Map uncached objects in the low 512mb of address space using KSEG1,
 69          * otherwise map using page tables.
 70          */
 71         if (IS_LOW512(phys_addr) && IS_LOW512(last_addr) &&
 72             flags == _CACHE_UNCACHED)
 73                 return (void __iomem *) CKSEG1ADDR(phys_addr);
 74 
 75         /*
 76          * Don't allow anybody to remap RAM that may be allocated by the page
 77          * allocator, since that could lead to races & data clobbering.
 78          */
 79         pfn = PFN_DOWN(phys_addr);
 80         last_pfn = PFN_DOWN(last_addr);
 81         if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL,
 82                                   __ioremap_check_ram) == 1) {
 83                 WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n",
 84                           &phys_addr, &last_addr);
 85                 return NULL;
 86         }
 87 
 88         /*
 89          * Mappings have to be page-aligned
 90          */
 91         offset = phys_addr & ~PAGE_MASK;
 92         phys_addr &= PAGE_MASK;
 93         size = PAGE_ALIGN(last_addr + 1) - phys_addr;
 94 
 95         /*
 96          * Ok, go for it..
 97          */
 98         area = get_vm_area(size, VM_IOREMAP);
 99         if (!area)
100                 return NULL;
101         vaddr = (unsigned long)area->addr;
102 
103         flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE;
104         if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
105                         __pgprot(flags))) {
106                 free_vm_area(area);
107                 return NULL;
108         }
109 
110         return (void __iomem *)(vaddr + offset);
111 }
112 EXPORT_SYMBOL(ioremap_prot);
113 
114 void iounmap(const volatile void __iomem *addr)
115 {
116         if (!plat_iounmap(addr) && !IS_KSEG1(addr))
117                 vunmap((void *)((unsigned long)addr & PAGE_MASK));
118 }
119 EXPORT_SYMBOL(iounmap);
120 

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