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 */
_swapw(volatile unsigned short v)25 static inline unsigned short _swapw(volatile unsigned short v)
26 {
27 return ((v << 8) | (v >> 8));
28 }
29
_swapl(volatile unsigned long v)30 static 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
io_outsb(unsigned int addr,void * buf,int len)57 static 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
io_outsw(unsigned int addr,void * buf,int len)65 static 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
io_outsl(unsigned int addr,void * buf,int len)73 static 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
io_insb(unsigned int addr,void * buf,int len)81 static 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
io_insw(unsigned int addr,void * buf,int len)89 static 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
io_insl(unsigned int addr,void * buf,int len)97 static 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
__ioremap(unsigned long physaddr,unsigned long size,int cacheflag)147 static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
148 {
149 return (void *) physaddr;
150 }
ioremap(unsigned long physaddr,unsigned long size)151 static inline void *ioremap(unsigned long physaddr, unsigned long size)
152 {
153 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
154 }
ioremap_nocache(unsigned long physaddr,unsigned long size)155 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
156 {
157 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
158 }
ioremap_writethrough(unsigned long physaddr,unsigned long size)159 static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
160 {
161 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
162 }
ioremap_fullcache(unsigned long physaddr,unsigned long size)163 static 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