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 */
24static inline unsigned short _swapw(volatile unsigned short v)
25{
26    return ((v << 8) | (v >> 8));
27}
28
29static 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
56static 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
64static 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
72static 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
80static 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
88static 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
96static 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
146extern void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
147extern void __iounmap(void *addr, unsigned long size);
148
149static inline void *ioremap(unsigned long physaddr, unsigned long size)
150{
151	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
152}
153static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
154{
155	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
156}
157static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
158{
159	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
160}
161static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
162{
163	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
164}
165
166extern void iounmap(void *addr);
167
168/* Nothing to do */
169
170#define dma_cache_inv(_start,_size)		do { } while (0)
171#define dma_cache_wback(_start,_size)		do { } while (0)
172#define dma_cache_wback_inv(_start,_size)	do { } while (0)
173
174/* Pages to physical address... */
175#define page_to_phys(page)      ((page - mem_map) << PAGE_SHIFT)
176#define page_to_bus(page)       ((page - mem_map) << PAGE_SHIFT)
177
178/*
179 * Macros used for converting between virtual and physical mappings.
180 */
181#define mm_ptov(vaddr)		((void *) (vaddr))
182#define mm_vtop(vaddr)		((unsigned long) (vaddr))
183#define phys_to_virt(vaddr)	((void *) (vaddr))
184#define virt_to_phys(vaddr)	((unsigned long) (vaddr))
185
186#define virt_to_bus virt_to_phys
187#define bus_to_virt phys_to_virt
188
189/*
190 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
191 * access
192 */
193#define xlate_dev_mem_ptr(p)	__va(p)
194
195/*
196 * Convert a virtual cached pointer to an uncached pointer
197 */
198#define xlate_dev_kmem_ptr(p)	p
199
200#endif /* __KERNEL__ */
201
202#endif /* _M68KNOMMU_IO_H */
203