1 /* 1
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
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)
23 #define IS_KSEG1(addr) (((unsigned long)(addr)
24
25 static int __ioremap_check_ram(unsigned long s
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(
33 return 1;
34 }
35
36 return 0;
37 }
38
39 /*
40 * ioremap_prot - map bus memory into CP
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
45 */
46 void __iomem *ioremap_prot(phys_addr_t phys_ad
47 unsigned long prot_val)
48 {
49 unsigned long flags = prot_val & _CACH
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, siz
57 if (cpu_addr)
58 return cpu_addr;
59
60 phys_addr = fixup_bigphys_addr(phys_ad
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 512
69 * otherwise map using page tables.
70 */
71 if (IS_LOW512(phys_addr) && IS_LOW512(
72 flags == _CACHE_UNCACHED)
73 return (void __iomem *) CKSEG1
74
75 /* Early remaps should use the unmappe
76 if (WARN_ON_ONCE(!slab_is_available())
77 return NULL;
78
79 /*
80 * Don't allow anybody to remap RAM th
81 * allocator, since that could lead to
82 */
83 pfn = PFN_DOWN(phys_addr);
84 last_pfn = PFN_DOWN(last_addr);
85 if (walk_system_ram_range(pfn, last_pf
86 __ioremap_ch
87 WARN_ONCE(1, "ioremap on RAM a
88 &phys_addr, &last_ad
89 return NULL;
90 }
91
92 /*
93 * Mappings have to be page-aligned
94 */
95 offset = phys_addr & ~PAGE_MASK;
96 phys_addr &= PAGE_MASK;
97 size = PAGE_ALIGN(last_addr + 1) - phy
98
99 /*
100 * Ok, go for it..
101 */
102 area = get_vm_area(size, VM_IOREMAP);
103 if (!area)
104 return NULL;
105 vaddr = (unsigned long)area->addr;
106
107 flags |= _PAGE_GLOBAL | _PAGE_PRESENT
108 if (ioremap_page_range(vaddr, vaddr +
109 __pgprot(flags))) {
110 free_vm_area(area);
111 return NULL;
112 }
113
114 return (void __iomem *)(vaddr + offset
115 }
116 EXPORT_SYMBOL(ioremap_prot);
117
118 void iounmap(const volatile void __iomem *addr
119 {
120 if (!plat_iounmap(addr) && !IS_KSEG1(a
121 vunmap((void *)((unsigned long
122 }
123 EXPORT_SYMBOL(iounmap);
124
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