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1 #ifndef _M68KNOMMU_IO_H
2 #define _M68KNOMMU_IO_H
3 
4 #ifdef __KERNEL__
5 
6 
7 /*
8  * These are for ISA/PCI shared memory _only_ and should never be used
9  * on any other type of memory, including Zorro memory. They are meant to
10  * access the bus in the bus byte order which is little-endian!.
11  *
12  * readX/writeX() are used to access memory mapped devices. On some
13  * architectures the memory mapped IO stuff needs to be accessed
14  * differently. On the m68k architecture, we just read/write the
15  * memory location directly.
16  */
17 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
18  * two accesses to memory, which may be undesireable for some devices.
19  */
20 
21 /*
22  * swap functions are sometimes needed to interface little-endian hardware
23  */
_swapw(volatile unsigned short v)24 static inline unsigned short _swapw(volatile unsigned short v)
25 {
26     return ((v << 8) | (v >> 8));
27 }
28 
_swapl(volatile unsigned long v)29 static inline unsigned int _swapl(volatile unsigned long v)
30 {
31     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
32 }
33 
34 #define readb(addr) \
35     ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
36 #define readw(addr) \
37     ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
38 #define readl(addr) \
39     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
40 
41 #define readb_relaxed(addr) readb(addr)
42 #define readw_relaxed(addr) readw(addr)
43 #define readl_relaxed(addr) readl(addr)
44 
45 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
46 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
47 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
48 
49 #define __raw_readb readb
50 #define __raw_readw readw
51 #define __raw_readl readl
52 #define __raw_writeb writeb
53 #define __raw_writew writew
54 #define __raw_writel writel
55 
io_outsb(unsigned int addr,void * buf,int len)56 static inline void io_outsb(unsigned int addr, void *buf, int len)
57 {
58 	volatile unsigned char *ap = (volatile unsigned char *) addr;
59 	unsigned char *bp = (unsigned char *) buf;
60 	while (len--)
61 		*ap = *bp++;
62 }
63 
io_outsw(unsigned int addr,void * buf,int len)64 static inline void io_outsw(unsigned int addr, void *buf, int len)
65 {
66 	volatile unsigned short *ap = (volatile unsigned short *) addr;
67 	unsigned short *bp = (unsigned short *) buf;
68 	while (len--)
69 		*ap = _swapw(*bp++);
70 }
71 
io_outsl(unsigned int addr,void * buf,int len)72 static inline void io_outsl(unsigned int addr, void *buf, int len)
73 {
74 	volatile unsigned int *ap = (volatile unsigned int *) addr;
75 	unsigned int *bp = (unsigned int *) buf;
76 	while (len--)
77 		*ap = _swapl(*bp++);
78 }
79 
io_insb(unsigned int addr,void * buf,int len)80 static inline void io_insb(unsigned int addr, void *buf, int len)
81 {
82 	volatile unsigned char *ap = (volatile unsigned char *) addr;
83 	unsigned char *bp = (unsigned char *) buf;
84 	while (len--)
85 		*bp++ = *ap;
86 }
87 
io_insw(unsigned int addr,void * buf,int len)88 static inline void io_insw(unsigned int addr, void *buf, int len)
89 {
90 	volatile unsigned short *ap = (volatile unsigned short *) addr;
91 	unsigned short *bp = (unsigned short *) buf;
92 	while (len--)
93 		*bp++ = _swapw(*ap);
94 }
95 
io_insl(unsigned int addr,void * buf,int len)96 static inline void io_insl(unsigned int addr, void *buf, int len)
97 {
98 	volatile unsigned int *ap = (volatile unsigned int *) addr;
99 	unsigned int *bp = (unsigned int *) buf;
100 	while (len--)
101 		*bp++ = _swapl(*ap);
102 }
103 
104 #define mmiowb()
105 
106 /*
107  *	make the short names macros so specific devices
108  *	can override them as required
109  */
110 
111 #define memset_io(a,b,c)	memset((void *)(a),(b),(c))
112 #define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))
113 #define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))
114 
115 #define inb(addr)    readb(addr)
116 #define inw(addr)    readw(addr)
117 #define inl(addr)    readl(addr)
118 #define outb(x,addr) ((void) writeb(x,addr))
119 #define outw(x,addr) ((void) writew(x,addr))
120 #define outl(x,addr) ((void) writel(x,addr))
121 
122 #define inb_p(addr)    inb(addr)
123 #define inw_p(addr)    inw(addr)
124 #define inl_p(addr)    inl(addr)
125 #define outb_p(x,addr) outb(x,addr)
126 #define outw_p(x,addr) outw(x,addr)
127 #define outl_p(x,addr) outl(x,addr)
128 
129 #define outsb(a,b,l) io_outsb(a,b,l)
130 #define outsw(a,b,l) io_outsw(a,b,l)
131 #define outsl(a,b,l) io_outsl(a,b,l)
132 
133 #define insb(a,b,l) io_insb(a,b,l)
134 #define insw(a,b,l) io_insw(a,b,l)
135 #define insl(a,b,l) io_insl(a,b,l)
136 
137 #define IO_SPACE_LIMIT 0xffff
138 
139 
140 /* Values for nocacheflag and cmode */
141 #define IOMAP_FULL_CACHING		0
142 #define IOMAP_NOCACHE_SER		1
143 #define IOMAP_NOCACHE_NONSER		2
144 #define IOMAP_WRITETHROUGH		3
145 
146 extern void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
147 extern void __iounmap(void *addr, unsigned long size);
148 
ioremap(unsigned long physaddr,unsigned long size)149 static inline void *ioremap(unsigned long physaddr, unsigned long size)
150 {
151 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
152 }
ioremap_nocache(unsigned long physaddr,unsigned long size)153 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
154 {
155 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
156 }
ioremap_writethrough(unsigned long physaddr,unsigned long size)157 static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
158 {
159 	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
160 }
ioremap_fullcache(unsigned long physaddr,unsigned long size)161 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
162 {
163 	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
164 }
165 
166 extern void iounmap(void *addr);
167 
168 /* Pages to physical address... */
169 #define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
170 #define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
171 
172 /*
173  * Macros used for converting between virtual and physical mappings.
174  */
175 #define phys_to_virt(vaddr)	((void *) (vaddr))
176 #define virt_to_phys(vaddr)	((unsigned long) (vaddr))
177 
178 #define virt_to_bus virt_to_phys
179 #define bus_to_virt phys_to_virt
180 
181 /*
182  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
183  * access
184  */
185 #define xlate_dev_mem_ptr(p)	__va(p)
186 
187 /*
188  * Convert a virtual cached pointer to an uncached pointer
189  */
190 #define xlate_dev_kmem_ptr(p)	p
191 
192 #endif /* __KERNEL__ */
193 
194 #endif /* _M68KNOMMU_IO_H */
195