tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <linux/bug.h>
18#include <linux/kernel.h>
19
20#include <linux/types.h>
21
22#define XCHAL_KIO_CACHED_VADDR 0xe0000000
23#define XCHAL_KIO_BYPASS_VADDR 0xf0000000
24#define XCHAL_KIO_PADDR 0xf0000000
25#define XCHAL_KIO_SIZE 0x10000000
26
27#define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x))
28#define IO_SPACE_LIMIT ~0
29
30#ifdef CONFIG_MMU
31/*
32 * Return the virtual address for the specified bus memory.
33 * Note that we currently don't support any address outside the KIO segment.
34 */
35static 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 BUG();
43}
44
45static 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 BUG();
53}
54
55#define ioremap_wc ioremap_nocache
56
57static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
58{
59 return ioremap_nocache(offset, size);
60}
61
62static inline void iounmap(volatile void __iomem *addr)
63{
64}
65
66#define virt_to_bus virt_to_phys
67#define bus_to_virt phys_to_virt
68
69#endif /* CONFIG_MMU */
70
71/*
72 * Generic I/O
73 */
74#define readb_relaxed readb
75#define readw_relaxed readw
76#define readl_relaxed readl
77
78#endif /* __KERNEL__ */
79
80#include <asm-generic/io.h>
81
82#endif /* _XTENSA_IO_H */