tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/unicore32/include/asm/io.h
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#ifndef __UNICORE_IO_H__
13#define __UNICORE_IO_H__
14
15#ifdef __KERNEL__
16
17#include <asm/byteorder.h>
18#include <asm/memory.h>
19
20#define PCI_IOBASE PKUNITY_PCILIO_BASE
21#include <asm-generic/io.h>
22
23/*
24 * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address.
25 */
26extern void __iomem *__uc32_ioremap(unsigned long, size_t);
27extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
28extern void __uc32_iounmap(volatile void __iomem *addr);
29
30/*
31 * ioremap and friends.
32 *
33 * ioremap takes a PCI memory address, as specified in
34 * Documentation/io-mapping.txt.
35 *
36 */
37#define ioremap(cookie, size) __uc32_ioremap(cookie, size)
38#define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size)
39#define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size)
40#define iounmap(cookie) __uc32_iounmap(cookie)
41
42#define readb_relaxed readb
43#define readw_relaxed readw
44#define readl_relaxed readl
45
46#define HAVE_ARCH_PIO_SIZE
47#define PIO_OFFSET (unsigned int)(PCI_IOBASE)
48#define PIO_MASK (unsigned int)(IO_SPACE_LIMIT)
49#define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1)
50
51#ifdef CONFIG_STRICT_DEVMEM
52
53#include <linux/ioport.h>
54#include <linux/mm.h>
55
56/*
57 * devmem_is_allowed() checks to see if /dev/mem access to a certain
58 * address is valid. The argument is a physical page number.
59 * We mimic x86 here by disallowing access to system RAM as well as
60 * device-exclusive MMIO regions. This effectively disable read()/write()
61 * on /dev/mem.
62 */
63static inline int devmem_is_allowed(unsigned long pfn)
64{
65 if (iomem_is_exclusive(pfn << PAGE_SHIFT))
66 return 0;
67 if (!page_is_ram(pfn))
68 return 1;
69 return 0;
70}
71
72#endif /* CONFIG_STRICT_DEVMEM */
73
74#endif /* __KERNEL__ */
75#endif /* __UNICORE_IO_H__ */