xref: /openbmc/linux/arch/m68k/include/asm/io_no.h (revision c819e2cf)
1 #ifndef _M68KNOMMU_IO_H
2 #define _M68KNOMMU_IO_H
3 
4 #ifdef __KERNEL__
5 
6 #include <asm/virtconvert.h>
7 #include <asm-generic/iomap.h>
8 
9 /*
10  * These are for ISA/PCI shared memory _only_ and should never be used
11  * on any other type of memory, including Zorro memory. They are meant to
12  * access the bus in the bus byte order which is little-endian!.
13  *
14  * readX/writeX() are used to access memory mapped devices. On some
15  * architectures the memory mapped IO stuff needs to be accessed
16  * differently. On the m68k architecture, we just read/write the
17  * memory location directly.
18  */
19 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
20  * two accesses to memory, which may be undesirable for some devices.
21  */
22 
23 /*
24  * swap functions are sometimes needed to interface little-endian hardware
25  */
26 static inline unsigned short _swapw(volatile unsigned short v)
27 {
28     return ((v << 8) | (v >> 8));
29 }
30 
31 static inline unsigned int _swapl(volatile unsigned long v)
32 {
33     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
34 }
35 
36 #define readb(addr) \
37     ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
38 #define readw(addr) \
39     ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
40 #define readl(addr) \
41     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
42 
43 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
44 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
45 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
46 
47 #define __raw_readb readb
48 #define __raw_readw readw
49 #define __raw_readl readl
50 #define __raw_writeb writeb
51 #define __raw_writew writew
52 #define __raw_writel writel
53 
54 static inline void io_outsb(unsigned int addr, const void *buf, int len)
55 {
56 	volatile unsigned char *ap = (volatile unsigned char *) addr;
57 	unsigned char *bp = (unsigned char *) buf;
58 	while (len--)
59 		*ap = *bp++;
60 }
61 
62 static inline void io_outsw(unsigned int addr, const void *buf, int len)
63 {
64 	volatile unsigned short *ap = (volatile unsigned short *) addr;
65 	unsigned short *bp = (unsigned short *) buf;
66 	while (len--)
67 		*ap = _swapw(*bp++);
68 }
69 
70 static inline void io_outsl(unsigned int addr, const void *buf, int len)
71 {
72 	volatile unsigned int *ap = (volatile unsigned int *) addr;
73 	unsigned int *bp = (unsigned int *) buf;
74 	while (len--)
75 		*ap = _swapl(*bp++);
76 }
77 
78 static inline void io_insb(unsigned int addr, void *buf, int len)
79 {
80 	volatile unsigned char *ap = (volatile unsigned char *) addr;
81 	unsigned char *bp = (unsigned char *) buf;
82 	while (len--)
83 		*bp++ = *ap;
84 }
85 
86 static inline void io_insw(unsigned int addr, void *buf, int len)
87 {
88 	volatile unsigned short *ap = (volatile unsigned short *) addr;
89 	unsigned short *bp = (unsigned short *) buf;
90 	while (len--)
91 		*bp++ = _swapw(*ap);
92 }
93 
94 static inline void io_insl(unsigned int addr, void *buf, int len)
95 {
96 	volatile unsigned int *ap = (volatile unsigned int *) addr;
97 	unsigned int *bp = (unsigned int *) buf;
98 	while (len--)
99 		*bp++ = _swapl(*ap);
100 }
101 
102 #define mmiowb()
103 
104 /*
105  *	make the short names macros so specific devices
106  *	can override them as required
107  */
108 
109 #define memset_io(a,b,c)	memset((void *)(a),(b),(c))
110 #define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))
111 #define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))
112 
113 #define inb(addr)    readb(addr)
114 #define inw(addr)    readw(addr)
115 #define inl(addr)    readl(addr)
116 #define outb(x,addr) ((void) writeb(x,addr))
117 #define outw(x,addr) ((void) writew(x,addr))
118 #define outl(x,addr) ((void) writel(x,addr))
119 
120 #define inb_p(addr)    inb(addr)
121 #define inw_p(addr)    inw(addr)
122 #define inl_p(addr)    inl(addr)
123 #define outb_p(x,addr) outb(x,addr)
124 #define outw_p(x,addr) outw(x,addr)
125 #define outl_p(x,addr) outl(x,addr)
126 
127 #define outsb(a,b,l) io_outsb(a,b,l)
128 #define outsw(a,b,l) io_outsw(a,b,l)
129 #define outsl(a,b,l) io_outsl(a,b,l)
130 
131 #define insb(a,b,l) io_insb(a,b,l)
132 #define insw(a,b,l) io_insw(a,b,l)
133 #define insl(a,b,l) io_insl(a,b,l)
134 
135 #define IO_SPACE_LIMIT 0xffffffff
136 
137 
138 /* Values for nocacheflag and cmode */
139 #define IOMAP_FULL_CACHING		0
140 #define IOMAP_NOCACHE_SER		1
141 #define IOMAP_NOCACHE_NONSER		2
142 #define IOMAP_WRITETHROUGH		3
143 
144 static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
145 {
146 	return (void *) physaddr;
147 }
148 static inline void *ioremap(unsigned long physaddr, unsigned long size)
149 {
150 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
151 }
152 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
153 {
154 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
155 }
156 static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
157 {
158 	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
159 }
160 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
161 {
162 	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
163 }
164 
165 #define	iounmap(addr)	do { } while(0)
166 
167 /*
168  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
169  * access
170  */
171 #define xlate_dev_mem_ptr(p)	__va(p)
172 
173 /*
174  * Convert a virtual cached pointer to an uncached pointer
175  */
176 #define xlate_dev_kmem_ptr(p)	p
177 
178 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
179 {
180 	return (void __iomem *) port;
181 }
182 
183 static inline void ioport_unmap(void __iomem *p)
184 {
185 }
186 
187 #endif /* __KERNEL__ */
188 
189 #endif /* _M68KNOMMU_IO_H */
190