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