1#ifndef _M68KNOMMU_IO_H
2#define _M68KNOMMU_IO_H
3
4#ifdef __KERNEL__
5
6#include <asm/virtconvert.h>
7
8/*
9 * These are for ISA/PCI shared memory _only_ and should never be used
10 * on any other type of memory, including Zorro memory. They are meant to
11 * access the bus in the bus byte order which is little-endian!.
12 *
13 * readX/writeX() are used to access memory mapped devices. On some
14 * architectures the memory mapped IO stuff needs to be accessed
15 * differently. On the m68k architecture, we just read/write the
16 * memory location directly.
17 */
18/* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
19 * two accesses to memory, which may be undesirable for some devices.
20 */
21
22/*
23 * swap functions are sometimes needed to interface little-endian hardware
24 */
25static inline unsigned short _swapw(volatile unsigned short v)
26{
27    return ((v << 8) | (v >> 8));
28}
29
30static inline unsigned int _swapl(volatile unsigned long v)
31{
32    return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
33}
34
35#define readb(addr) \
36    ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
37#define readw(addr) \
38    ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
39#define readl(addr) \
40    ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
41
42#define readb_relaxed(addr) readb(addr)
43#define readw_relaxed(addr) readw(addr)
44#define readl_relaxed(addr) readl(addr)
45
46#define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
47#define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
48#define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
49
50#define __raw_readb readb
51#define __raw_readw readw
52#define __raw_readl readl
53#define __raw_writeb writeb
54#define __raw_writew writew
55#define __raw_writel writel
56
57static inline void io_outsb(unsigned int addr, void *buf, int len)
58{
59	volatile unsigned char *ap = (volatile unsigned char *) addr;
60	unsigned char *bp = (unsigned char *) buf;
61	while (len--)
62		*ap = *bp++;
63}
64
65static inline void io_outsw(unsigned int addr, void *buf, int len)
66{
67	volatile unsigned short *ap = (volatile unsigned short *) addr;
68	unsigned short *bp = (unsigned short *) buf;
69	while (len--)
70		*ap = _swapw(*bp++);
71}
72
73static inline void io_outsl(unsigned int addr, void *buf, int len)
74{
75	volatile unsigned int *ap = (volatile unsigned int *) addr;
76	unsigned int *bp = (unsigned int *) buf;
77	while (len--)
78		*ap = _swapl(*bp++);
79}
80
81static inline void io_insb(unsigned int addr, void *buf, int len)
82{
83	volatile unsigned char *ap = (volatile unsigned char *) addr;
84	unsigned char *bp = (unsigned char *) buf;
85	while (len--)
86		*bp++ = *ap;
87}
88
89static inline void io_insw(unsigned int addr, void *buf, int len)
90{
91	volatile unsigned short *ap = (volatile unsigned short *) addr;
92	unsigned short *bp = (unsigned short *) buf;
93	while (len--)
94		*bp++ = _swapw(*ap);
95}
96
97static inline void io_insl(unsigned int addr, void *buf, int len)
98{
99	volatile unsigned int *ap = (volatile unsigned int *) addr;
100	unsigned int *bp = (unsigned int *) buf;
101	while (len--)
102		*bp++ = _swapl(*ap);
103}
104
105#define mmiowb()
106
107/*
108 *	make the short names macros so specific devices
109 *	can override them as required
110 */
111
112#define memset_io(a,b,c)	memset((void *)(a),(b),(c))
113#define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))
114#define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))
115
116#define inb(addr)    readb(addr)
117#define inw(addr)    readw(addr)
118#define inl(addr)    readl(addr)
119#define outb(x,addr) ((void) writeb(x,addr))
120#define outw(x,addr) ((void) writew(x,addr))
121#define outl(x,addr) ((void) writel(x,addr))
122
123#define inb_p(addr)    inb(addr)
124#define inw_p(addr)    inw(addr)
125#define inl_p(addr)    inl(addr)
126#define outb_p(x,addr) outb(x,addr)
127#define outw_p(x,addr) outw(x,addr)
128#define outl_p(x,addr) outl(x,addr)
129
130#define outsb(a,b,l) io_outsb(a,b,l)
131#define outsw(a,b,l) io_outsw(a,b,l)
132#define outsl(a,b,l) io_outsl(a,b,l)
133
134#define insb(a,b,l) io_insb(a,b,l)
135#define insw(a,b,l) io_insw(a,b,l)
136#define insl(a,b,l) io_insl(a,b,l)
137
138#define IO_SPACE_LIMIT 0xffffffff
139
140
141/* Values for nocacheflag and cmode */
142#define IOMAP_FULL_CACHING		0
143#define IOMAP_NOCACHE_SER		1
144#define IOMAP_NOCACHE_NONSER		2
145#define IOMAP_WRITETHROUGH		3
146
147static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
148{
149	return (void *) physaddr;
150}
151static inline void *ioremap(unsigned long physaddr, unsigned long size)
152{
153	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
154}
155static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
156{
157	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
158}
159static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
160{
161	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
162}
163static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
164{
165	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
166}
167
168#define	iounmap(addr)	do { } while(0)
169
170/*
171 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
172 * access
173 */
174#define xlate_dev_mem_ptr(p)	__va(p)
175
176/*
177 * Convert a virtual cached pointer to an uncached pointer
178 */
179#define xlate_dev_kmem_ptr(p)	p
180
181#endif /* __KERNEL__ */
182
183#endif /* _M68KNOMMU_IO_H */
184