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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  */
26 extern void __iomem *__uc32_ioremap(unsigned long, size_t);
27 extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
28 extern 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  */
devmem_is_allowed(unsigned long pfn)63 static 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__ */
76