It wasn't just x86-64 that had hardcoded VM_FAULT_xxx numbers
[linux-3.10.git] / arch / cris / mm / ioremap.c
1 /*
2  * arch/cris/mm/ioremap.c
3  *
4  * Re-map IO memory to kernel address space so that we can access it.
5  * Needed for memory-mapped I/O devices mapped outside our normal DRAM
6  * window (that is, all memory-mapped I/O devices).
7  *
8  * (C) Copyright 1995 1996 Linus Torvalds
9  * CRIS-port by Axis Communications AB
10  */
11
12 #include <linux/vmalloc.h>
13 #include <asm/io.h>
14 #include <asm/pgalloc.h>
15 #include <asm/cacheflush.h>
16 #include <asm/tlbflush.h>
17 #include <asm/arch/memmap.h>
18
19 extern inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
20         unsigned long phys_addr, pgprot_t prot)
21 {
22         unsigned long end;
23
24         address &= ~PMD_MASK;
25         end = address + size;
26         if (end > PMD_SIZE)
27                 end = PMD_SIZE;
28         if (address >= end)
29                 BUG();
30         do {
31                 if (!pte_none(*pte)) {
32                         printk("remap_area_pte: page already exists\n");
33                         BUG();
34                 }
35                 set_pte(pte, mk_pte_phys(phys_addr, prot));
36                 address += PAGE_SIZE;
37                 phys_addr += PAGE_SIZE;
38                 pte++;
39         } while (address && (address < end));
40 }
41
42 static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
43         unsigned long phys_addr, pgprot_t prot)
44 {
45         unsigned long end;
46
47         address &= ~PGDIR_MASK;
48         end = address + size;
49         if (end > PGDIR_SIZE)
50                 end = PGDIR_SIZE;
51         phys_addr -= address;
52         if (address >= end)
53                 BUG();
54         do {
55                 pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
56                 if (!pte)
57                         return -ENOMEM;
58                 remap_area_pte(pte, address, end - address, address + phys_addr, prot);
59                 address = (address + PMD_SIZE) & PMD_MASK;
60                 pmd++;
61         } while (address && (address < end));
62         return 0;
63 }
64
65 static int remap_area_pages(unsigned long address, unsigned long phys_addr,
66                                  unsigned long size, pgprot_t prot)
67 {
68         int error;
69         pgd_t * dir;
70         unsigned long end = address + size;
71
72         phys_addr -= address;
73         dir = pgd_offset(&init_mm, address);
74         flush_cache_all();
75         if (address >= end)
76                 BUG();
77         spin_lock(&init_mm.page_table_lock);
78         do {
79                 pud_t *pud;
80                 pmd_t *pmd;
81
82                 error = -ENOMEM;
83                 pud = pud_alloc(&init_mm, dir, address);
84                 if (!pud)
85                         break;
86                 pmd = pmd_alloc(&init_mm, pud, address);
87
88                 if (!pmd)
89                         break;
90                 if (remap_area_pmd(pmd, address, end - address,
91                                    phys_addr + address, prot))
92                         break;
93                 error = 0;
94                 address = (address + PGDIR_SIZE) & PGDIR_MASK;
95                 dir++;
96         } while (address && (address < end));
97         spin_unlock(&init_mm.page_table_lock);
98         flush_tlb_all();
99         return error;
100 }
101
102 /*
103  * Generic mapping function (not visible outside):
104  */
105
106 /*
107  * Remap an arbitrary physical address space into the kernel virtual
108  * address space. Needed when the kernel wants to access high addresses
109  * directly.
110  *
111  * NOTE! We need to allow non-page-aligned mappings too: we will obviously
112  * have to convert them into an offset in a page-aligned mapping, but the
113  * caller shouldn't need to know that small detail.
114  */
115 void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot)
116 {
117         void __iomem * addr;
118         struct vm_struct * area;
119         unsigned long offset, last_addr;
120
121         /* Don't allow wraparound or zero size */
122         last_addr = phys_addr + size - 1;
123         if (!size || last_addr < phys_addr)
124                 return NULL;
125
126         /*
127          * Mappings have to be page-aligned
128          */
129         offset = phys_addr & ~PAGE_MASK;
130         phys_addr &= PAGE_MASK;
131         size = PAGE_ALIGN(last_addr+1) - phys_addr;
132
133         /*
134          * Ok, go for it..
135          */
136         area = get_vm_area(size, VM_IOREMAP);
137         if (!area)
138                 return NULL;
139         addr = (void __iomem *)area->addr;
140         if (remap_area_pages((unsigned long) addr, phys_addr, size, prot)) {
141                 vfree((void __force *)addr);
142                 return NULL;
143         }
144         return (void __iomem *) (offset + (char __iomem *)addr);
145 }
146
147 void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
148 {
149         return __ioremap_prot(phys_addr, size,
150                               __pgprot(_PAGE_PRESENT | __READABLE |
151                                        __WRITEABLE | _PAGE_GLOBAL |
152                                        _PAGE_KERNEL | flags));
153 }
154
155 /**
156  * ioremap_nocache     -   map bus memory into CPU space
157  * @offset:    bus address of the memory
158  * @size:      size of the resource to map
159  *
160  * Must be freed with iounmap.
161  */
162
163 void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
164 {
165         return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0);
166 }
167
168 void iounmap(volatile void __iomem *addr)
169 {
170         if (addr > high_memory)
171                 return vfree((void *) (PAGE_MASK & (unsigned long) addr));
172 }