xref: /linux/arch/xtensa/include/asm/io.h (revision d91517839e5d95adc0cf4b28caa7af62a71de526)
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 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && CONFIG_OF
29 extern unsigned long xtensa_kio_paddr;
30 
31 static inline unsigned long xtensa_get_kio_paddr(void)
32 {
33 	return xtensa_kio_paddr;
34 }
35 #endif
36 
37 /*
38  * Return the virtual address for the specified bus memory.
39  * Note that we currently don't support any address outside the KIO segment.
40  */
41 static inline void __iomem *ioremap_nocache(unsigned long offset,
42 		unsigned long size)
43 {
44 	if (offset >= XCHAL_KIO_PADDR
45 	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
46 		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
47 	else
48 		BUG();
49 }
50 
51 static inline void __iomem *ioremap_cache(unsigned long offset,
52 		unsigned long size)
53 {
54 	if (offset >= XCHAL_KIO_PADDR
55 	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
56 		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
57 	else
58 		BUG();
59 }
60 
61 #define ioremap_wc ioremap_nocache
62 
63 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
64 {
65 	return ioremap_nocache(offset, size);
66 }
67 
68 static inline void iounmap(volatile void __iomem *addr)
69 {
70 }
71 
72 #define virt_to_bus     virt_to_phys
73 #define bus_to_virt     phys_to_virt
74 
75 #endif /* CONFIG_MMU */
76 
77 /*
78  * Generic I/O
79  */
80 #define readb_relaxed readb
81 #define readw_relaxed readw
82 #define readl_relaxed readl
83 
84 #endif	/* __KERNEL__ */
85 
86 #include <asm-generic/io.h>
87 
88 #endif	/* _XTENSA_IO_H */
89