]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/metag/mm/ioremap.c
1 // SPDX-License-Identifier: GPL-2.0
3 * Re-map IO memory to kernel address space so that we can access it.
4 * Needed for memory-mapped I/O devices mapped outside our normal DRAM
5 * window (that is, all memory-mapped I/O devices).
7 * Copyright (C) 1995,1996 Linus Torvalds
9 * Meta port based on CRIS-port by Axis Communications AB
12 #include <linux/vmalloc.h>
14 #include <linux/export.h>
15 #include <linux/slab.h>
18 #include <asm/pgtable.h>
21 * Remap an arbitrary physical address space into the kernel virtual
22 * address space. Needed when the kernel wants to access high addresses
25 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
26 * have to convert them into an offset in a page-aligned mapping, but the
27 * caller shouldn't need to know that small detail.
29 void __iomem
*__ioremap(unsigned long phys_addr
, size_t size
,
33 struct vm_struct
*area
;
34 unsigned long offset
, last_addr
;
37 /* Don't allow wraparound or zero size */
38 last_addr
= phys_addr
+ size
- 1;
39 if (!size
|| last_addr
< phys_addr
)
42 /* Custom region addresses are accessible and uncached by default. */
43 if (phys_addr
>= LINSYSCUSTOM_BASE
&&
44 phys_addr
< (LINSYSCUSTOM_BASE
+ LINSYSCUSTOM_LIMIT
))
45 return (__force
void __iomem
*) phys_addr
;
48 * Mappings have to be page-aligned
50 offset
= phys_addr
& ~PAGE_MASK
;
51 phys_addr
&= PAGE_MASK
;
52 size
= PAGE_ALIGN(last_addr
+1) - phys_addr
;
53 prot
= __pgprot(_PAGE_PRESENT
| _PAGE_WRITE
| _PAGE_DIRTY
|
54 _PAGE_ACCESSED
| _PAGE_KERNEL
| _PAGE_CACHE_WIN0
|
60 area
= get_vm_area(size
, VM_IOREMAP
);
63 area
->phys_addr
= phys_addr
;
64 addr
= (unsigned long) area
->addr
;
65 if (ioremap_page_range(addr
, addr
+ size
, phys_addr
, prot
)) {
66 vunmap((void *) addr
);
69 return (__force
void __iomem
*) (offset
+ (char *)addr
);
71 EXPORT_SYMBOL(__ioremap
);
73 void __iounmap(void __iomem
*addr
)
77 if ((__force
unsigned long)addr
>= LINSYSCUSTOM_BASE
&&
78 (__force
unsigned long)addr
< (LINSYSCUSTOM_BASE
+
82 p
= remove_vm_area((void *)(PAGE_MASK
& (unsigned long __force
)addr
));
84 pr_err("iounmap: bad address %p\n", addr
);
90 EXPORT_SYMBOL(__iounmap
);