1 /*
2 * include/asm-xtensa/io.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11 #ifndef _XTENSA_IO_H
12 #define _XTENSA_IO_H
13
14 #ifdef __KERNEL__
15 #include <asm/byteorder.h>
16 #include <asm/page.h>
17 #include <asm/vectors.h>
18 #include <linux/bug.h>
19 #include <linux/kernel.h>
20
21 #include <linux/types.h>
22
23 #define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x))
24 #define IO_SPACE_LIMIT ~0
25
26 #ifdef CONFIG_MMU
27
28 void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
29 void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
30 void xtensa_iounmap(volatile void __iomem *addr);
31
32 /*
33 * Return the virtual address for the specified bus memory.
34 */
ioremap_nocache(unsigned long offset,unsigned long size)35 static inline void __iomem *ioremap_nocache(unsigned long offset,
36 unsigned long size)
37 {
38 if (offset >= XCHAL_KIO_PADDR
39 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
40 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
41 else
42 return xtensa_ioremap_nocache(offset, size);
43 }
44
ioremap_cache(unsigned long offset,unsigned long size)45 static inline void __iomem *ioremap_cache(unsigned long offset,
46 unsigned long size)
47 {
48 if (offset >= XCHAL_KIO_PADDR
49 && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
50 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
51 else
52 return xtensa_ioremap_cache(offset, size);
53 }
54 #define ioremap_cache ioremap_cache
55
56 #define ioremap_wc ioremap_nocache
57 #define ioremap_wt ioremap_nocache
58
ioremap(unsigned long offset,unsigned long size)59 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
60 {
61 return ioremap_nocache(offset, size);
62 }
63
iounmap(volatile void __iomem * addr)64 static inline void iounmap(volatile void __iomem *addr)
65 {
66 unsigned long va = (unsigned long) addr;
67
68 if (!(va >= XCHAL_KIO_CACHED_VADDR &&
69 va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
70 !(va >= XCHAL_KIO_BYPASS_VADDR &&
71 va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
72 xtensa_iounmap(addr);
73 }
74
75 #define virt_to_bus virt_to_phys
76 #define bus_to_virt phys_to_virt
77
78 #endif /* CONFIG_MMU */
79
80 #endif /* __KERNEL__ */
81
82 #include <asm-generic/io.h>
83
84 #endif /* _XTENSA_IO_H */
85