2 * linux/include/asm-arm/io.h
4 * Copyright (C) 1996-2000 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
12 * constant addresses and variable addresses.
13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
14 * specific IO header files.
15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
16 * 04-Apr-1999 PJB Added check_signature.
17 * 12-Dec-1999 RMK More cleanups
18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions
20 #ifndef __ASM_ARM_IO_H
21 #define __ASM_ARM_IO_H
25 #include <linux/types.h>
26 #include <asm/byteorder.h>
27 #include <asm/memory.h>
29 #include <asm/arch/hardware.h>
30 #endif /* XXX###XXX */
32 static inline void sync(void)
37 * Given a physical address and a length, return a virtual address
38 * that can be used to access the memory range with the caching
39 * properties specified by "flags".
41 #define MAP_NOCACHE (0)
42 #define MAP_WRCOMBINE (0)
43 #define MAP_WRBACK (0)
44 #define MAP_WRTHROUGH (0)
47 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
53 * Take down a mapping set up by map_physmem().
55 static inline void unmap_physmem(void *vaddr, unsigned long flags)
60 static inline phys_addr_t virt_to_phys(void * vaddr)
62 return (phys_addr_t)(vaddr);
66 * Generic virtual read/write. Note that we don't support half-word
67 * read/writes. We define __arch_*[bl] here, and leave __arch_*w
68 * to the architecture specific code.
70 #define __arch_getb(a) (*(volatile unsigned char *)(a))
71 #define __arch_getw(a) (*(volatile unsigned short *)(a))
72 #define __arch_getl(a) (*(volatile unsigned int *)(a))
74 #define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
75 #define __arch_putw(v,a) (*(volatile unsigned short *)(a) = (v))
76 #define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
78 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
79 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
80 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
82 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
83 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
84 extern void __raw_readsl(unsigned int addr, void *data, int longlen);
86 #define __raw_writeb(v,a) __arch_putb(v,a)
87 #define __raw_writew(v,a) __arch_putw(v,a)
88 #define __raw_writel(v,a) __arch_putl(v,a)
90 #define __raw_readb(a) __arch_getb(a)
91 #define __raw_readw(a) __arch_getw(a)
92 #define __raw_readl(a) __arch_getl(a)
94 #define writeb(v,a) __arch_putb(v,a)
95 #define writew(v,a) __arch_putw(v,a)
96 #define writel(v,a) __arch_putl(v,a)
98 #define readb(a) __arch_getb(a)
99 #define readw(a) __arch_getw(a)
100 #define readl(a) __arch_getl(a)
103 * The compiler seems to be incapable of optimising constants
104 * properly. Spell it out to the compiler in some cases.
105 * These are only valid for small values of "off" (< 1<<12)
107 #define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
108 #define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
109 #define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
111 #define __raw_base_readb(base,off) __arch_base_getb(base,off)
112 #define __raw_base_readw(base,off) __arch_base_getw(base,off)
113 #define __raw_base_readl(base,off) __arch_base_getl(base,off)
116 * Now, pick up the machine-defined IO definitions
118 #if 0 /* XXX###XXX */
119 #include <asm/arch/io.h>
120 #endif /* XXX###XXX */
123 * IO port access primitives
124 * -------------------------
126 * The ARM doesn't have special IO access instructions; all IO is memory
127 * mapped. Note that these are defined to perform little endian accesses
128 * only. Their primary purpose is to access PCI and ISA peripherals.
130 * Note that for a big endian machine, this implies that the following
131 * big endian mode connectivity is in place, as described by numerous
134 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
135 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
137 * The machine specific io.h include defines __io to translate an "IO"
138 * address to a memory address.
140 * Note that we prevent GCC re-ordering or caching values in expressions
141 * by introducing sequence points into the in*() definitions. Note that
142 * __raw_* do not guarantee this behaviour.
144 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
147 #define outb(v,p) __raw_writeb(v,__io(p))
148 #define outw(v,p) __raw_writew(cpu_to_le16(v),__io(p))
149 #define outl(v,p) __raw_writel(cpu_to_le32(v),__io(p))
151 #define inb(p) ({ unsigned int __v = __raw_readb(__io(p)); __v; })
152 #define inw(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
153 #define inl(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
155 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
156 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
157 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
159 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
160 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
161 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
164 #define outb_p(val,port) outb((val),(port))
165 #define outw_p(val,port) outw((val),(port))
166 #define outl_p(val,port) outl((val),(port))
167 #define inb_p(port) inb((port))
168 #define inw_p(port) inw((port))
169 #define inl_p(port) inl((port))
171 #define outsb_p(port,from,len) outsb(port,from,len)
172 #define outsw_p(port,from,len) outsw(port,from,len)
173 #define outsl_p(port,from,len) outsl(port,from,len)
174 #define insb_p(port,to,len) insb(port,to,len)
175 #define insw_p(port,to,len) insw(port,to,len)
176 #define insl_p(port,to,len) insl(port,to,len)
179 * ioremap and friends.
181 * ioremap takes a PCI memory address, as specified in
182 * linux/Documentation/IO-mapping.txt. If you want a
183 * physical address, use __ioremap instead.
185 extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
186 extern void __iounmap(void *addr);
189 * Generic ioremap support.
192 * iomem_valid_addr(off,size)
195 #ifdef iomem_valid_addr
196 #define __arch_ioremap(off,sz,nocache) \
198 unsigned long _off = (off), _size = (sz); \
199 void *_ret = (void *)0; \
200 if (iomem_valid_addr(_off, _size)) \
201 _ret = __ioremap(iomem_to_phys(_off),_size,0); \
205 #define __arch_iounmap __iounmap
208 #define ioremap(off,sz) __arch_ioremap((off),(sz),0)
209 #define ioremap_nocache(off,sz) __arch_ioremap((off),(sz),1)
210 #define iounmap(_addr) __arch_iounmap(_addr)
213 * DMA-consistent mapping functions. These allocate/free a region of
214 * uncached, unwrite-buffered mapped memory space for use with DMA
215 * devices. This is the "generic" version. The PCI specific version
218 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
219 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
220 extern void consistent_sync(void *vaddr, size_t size, int rw);
223 * String version of IO memory access ops:
225 extern void _memcpy_fromio(void *, unsigned long, size_t);
226 extern void _memcpy_toio(unsigned long, const void *, size_t);
227 extern void _memset_io(unsigned long, int, size_t);
229 extern void __readwrite_bug(const char *fn);
232 * If this architecture has PCI memory IO, then define the read/write
233 * macros. These should only be used with the cookie passed from
238 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
239 #define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
240 #define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
242 #define writeb(v,c) __raw_writeb(v,__mem_pci(c))
243 #define writew(v,c) __raw_writew(cpu_to_le16(v),__mem_pci(c))
244 #define writel(v,c) __raw_writel(cpu_to_le32(v),__mem_pci(c))
246 #define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
247 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
248 #define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
250 #define eth_io_copy_and_sum(s,c,l,b) \
251 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
254 check_signature(unsigned long io_addr, const unsigned char *signature,
259 if (readb(io_addr) != *signature)
270 #elif !defined(readb)
272 #define readb(addr) (__readwrite_bug("readb"),0)
273 #define readw(addr) (__readwrite_bug("readw"),0)
274 #define readl(addr) (__readwrite_bug("readl"),0)
275 #define writeb(v,addr) __readwrite_bug("writeb")
276 #define writew(v,addr) __readwrite_bug("writew")
277 #define writel(v,addr) __readwrite_bug("writel")
279 #define eth_io_copy_and_sum(a,b,c,d) __readwrite_bug("eth_io_copy_and_sum")
281 #define check_signature(io,sig,len) (0)
283 #endif /* __mem_pci */
286 * If this architecture has ISA IO, then define the isa_read/isa_write
291 #define isa_readb(addr) __raw_readb(__mem_isa(addr))
292 #define isa_readw(addr) __raw_readw(__mem_isa(addr))
293 #define isa_readl(addr) __raw_readl(__mem_isa(addr))
294 #define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
295 #define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
296 #define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
297 #define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
298 #define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
299 #define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
301 #define isa_eth_io_copy_and_sum(a,b,c,d) \
302 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
305 isa_check_signature(unsigned long io_addr, const unsigned char *signature,
310 if (isa_readb(io_addr) != *signature)
321 #else /* __mem_isa */
323 #define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
324 #define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
325 #define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
326 #define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
327 #define isa_writew(val,addr) __readwrite_bug("isa_writew")
328 #define isa_writel(val,addr) __readwrite_bug("isa_writel")
329 #define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
330 #define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
331 #define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
333 #define isa_eth_io_copy_and_sum(a,b,c,d) \
334 __readwrite_bug("isa_eth_io_copy_and_sum")
336 #define isa_check_signature(io,sig,len) (0)
338 #endif /* __mem_isa */
339 #endif /* __KERNEL__ */
340 #endif /* __ASM_ARM_IO_H */