xref: /openbmc/linux/arch/m68k/include/asm/io_no.h (revision e23feb16)
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 readb_relaxed(addr) readb(addr)
44 #define readw_relaxed(addr) readw(addr)
45 #define readl_relaxed(addr) readl(addr)
46 
47 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
48 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
49 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
50 
51 #define __raw_readb readb
52 #define __raw_readw readw
53 #define __raw_readl readl
54 #define __raw_writeb writeb
55 #define __raw_writew writew
56 #define __raw_writel writel
57 
58 static inline void io_outsb(unsigned int addr, void *buf, int len)
59 {
60 	volatile unsigned char *ap = (volatile unsigned char *) addr;
61 	unsigned char *bp = (unsigned char *) buf;
62 	while (len--)
63 		*ap = *bp++;
64 }
65 
66 static inline void io_outsw(unsigned int addr, void *buf, int len)
67 {
68 	volatile unsigned short *ap = (volatile unsigned short *) addr;
69 	unsigned short *bp = (unsigned short *) buf;
70 	while (len--)
71 		*ap = _swapw(*bp++);
72 }
73 
74 static inline void io_outsl(unsigned int addr, void *buf, int len)
75 {
76 	volatile unsigned int *ap = (volatile unsigned int *) addr;
77 	unsigned int *bp = (unsigned int *) buf;
78 	while (len--)
79 		*ap = _swapl(*bp++);
80 }
81 
82 static inline void io_insb(unsigned int addr, void *buf, int len)
83 {
84 	volatile unsigned char *ap = (volatile unsigned char *) addr;
85 	unsigned char *bp = (unsigned char *) buf;
86 	while (len--)
87 		*bp++ = *ap;
88 }
89 
90 static inline void io_insw(unsigned int addr, void *buf, int len)
91 {
92 	volatile unsigned short *ap = (volatile unsigned short *) addr;
93 	unsigned short *bp = (unsigned short *) buf;
94 	while (len--)
95 		*bp++ = _swapw(*ap);
96 }
97 
98 static inline void io_insl(unsigned int addr, void *buf, int len)
99 {
100 	volatile unsigned int *ap = (volatile unsigned int *) addr;
101 	unsigned int *bp = (unsigned int *) buf;
102 	while (len--)
103 		*bp++ = _swapl(*ap);
104 }
105 
106 #define mmiowb()
107 
108 /*
109  *	make the short names macros so specific devices
110  *	can override them as required
111  */
112 
113 #define memset_io(a,b,c)	memset((void *)(a),(b),(c))
114 #define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))
115 #define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))
116 
117 #define inb(addr)    readb(addr)
118 #define inw(addr)    readw(addr)
119 #define inl(addr)    readl(addr)
120 #define outb(x,addr) ((void) writeb(x,addr))
121 #define outw(x,addr) ((void) writew(x,addr))
122 #define outl(x,addr) ((void) writel(x,addr))
123 
124 #define inb_p(addr)    inb(addr)
125 #define inw_p(addr)    inw(addr)
126 #define inl_p(addr)    inl(addr)
127 #define outb_p(x,addr) outb(x,addr)
128 #define outw_p(x,addr) outw(x,addr)
129 #define outl_p(x,addr) outl(x,addr)
130 
131 #define outsb(a,b,l) io_outsb(a,b,l)
132 #define outsw(a,b,l) io_outsw(a,b,l)
133 #define outsl(a,b,l) io_outsl(a,b,l)
134 
135 #define insb(a,b,l) io_insb(a,b,l)
136 #define insw(a,b,l) io_insw(a,b,l)
137 #define insl(a,b,l) io_insl(a,b,l)
138 
139 #define IO_SPACE_LIMIT 0xffffffff
140 
141 
142 /* Values for nocacheflag and cmode */
143 #define IOMAP_FULL_CACHING		0
144 #define IOMAP_NOCACHE_SER		1
145 #define IOMAP_NOCACHE_NONSER		2
146 #define IOMAP_WRITETHROUGH		3
147 
148 static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
149 {
150 	return (void *) physaddr;
151 }
152 static inline void *ioremap(unsigned long physaddr, unsigned long size)
153 {
154 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
155 }
156 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
157 {
158 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
159 }
160 static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
161 {
162 	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
163 }
164 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
165 {
166 	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
167 }
168 
169 #define	iounmap(addr)	do { } while(0)
170 
171 /*
172  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
173  * access
174  */
175 #define xlate_dev_mem_ptr(p)	__va(p)
176 
177 /*
178  * Convert a virtual cached pointer to an uncached pointer
179  */
180 #define xlate_dev_kmem_ptr(p)	p
181 
182 #endif /* __KERNEL__ */
183 
184 #endif /* _M68KNOMMU_IO_H */
185