1 /*
2 * linux/include/asm-arm/io.h
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
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.
9 *
10 * Modifications:
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
19 */
20 #ifndef __ASM_ARM_IO_H
21 #define __ASM_ARM_IO_H
22
23 #ifdef __KERNEL__
24
25 #include <linux/types.h>
26 #include <asm/byteorder.h>
27 #include <asm/memory.h>
28 #include <asm/arch/hardware.h>
29
30 /*
31 * Generic virtual read/write. Note that we don't support half-word
32 * read/writes. We define __arch_*[bl] here, and leave __arch_*w
33 * to the architecture specific code.
34 */
35 #define __arch_getb(a) (*(volatile unsigned char *)(a))
36 #define __arch_getl(a) (*(volatile unsigned int *)(a))
37
38 #define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
39 #define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
40
41 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
42 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
43 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
44
45 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
46 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
47 extern void __raw_readsl(unsigned int addr, void *data, int longlen);
48
49 #define __raw_writeb(v,a) __arch_putb(v,a)
50 #define __raw_writew(v,a) __arch_putw(v,a)
51 #define __raw_writel(v,a) __arch_putl(v,a)
52
53 #define __raw_readb(a) __arch_getb(a)
54 #define __raw_readw(a) __arch_getw(a)
55 #define __raw_readl(a) __arch_getl(a)
56
57 /*
58 * The compiler seems to be incapable of optimising constants
59 * properly. Spell it out to the compiler in some cases.
60 * These are only valid for small values of "off" (< 1<<12)
61 */
62 #define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
63 #define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
64 #define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
65
66 #define __raw_base_readb(base,off) __arch_base_getb(base,off)
67 #define __raw_base_readw(base,off) __arch_base_getw(base,off)
68 #define __raw_base_readl(base,off) __arch_base_getl(base,off)
69
70 /*
71 * Now, pick up the machine-defined IO definitions
72 */
73 #include <asm/arch/io.h>
74
75 /*
76 * IO port access primitives
77 * -------------------------
78 *
79 * The ARM doesn't have special IO access instructions; all IO is memory
80 * mapped. Note that these are defined to perform little endian accesses
81 * only. Their primary purpose is to access PCI and ISA peripherals.
82 *
83 * Note that for a big endian machine, this implies that the following
84 * big endian mode connectivity is in place, as described by numerious
85 * ARM documents:
86 *
87 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
88 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
89 *
90 * The machine specific io.h include defines __io to translate an "IO"
91 * address to a memory address.
92 *
93 * Note that we prevent GCC re-ordering or caching values in expressions
94 * by introducing sequence points into the in*() definitions. Note that
95 * __raw_* do not guarantee this behaviour.
96 *
97 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
98 */
99 #ifdef __io
100 #define outb(v,p) __raw_writeb(v,__io(p))
101 #define outw(v,p) __raw_writew(cpu_to_le16(v),__io(p))
102 #define outl(v,p) __raw_writel(cpu_to_le32(v),__io(p))
103
104 #define inb(p) ({ unsigned int __v = __raw_readb(__io(p)); __v; })
105 #define inw(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
106 #define inl(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
107
108 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
109 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
110 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
111
112 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
113 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
114 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
115 #endif
116
117 #define outb_p(val,port) outb((val),(port))
118 #define outw_p(val,port) outw((val),(port))
119 #define outl_p(val,port) outl((val),(port))
120 #define inb_p(port) inb((port))
121 #define inw_p(port) inw((port))
122 #define inl_p(port) inl((port))
123
124 #define outsb_p(port,from,len) outsb(port,from,len)
125 #define outsw_p(port,from,len) outsw(port,from,len)
126 #define outsl_p(port,from,len) outsl(port,from,len)
127 #define insb_p(port,to,len) insb(port,to,len)
128 #define insw_p(port,to,len) insw(port,to,len)
129 #define insl_p(port,to,len) insl(port,to,len)
130
131 /*
132 * ioremap and friends.
133 *
134 * ioremap takes a PCI memory address, as specified in
135 * linux/Documentation/IO-mapping.txt. If you want a
136 * physical address, use __ioremap instead.
137 */
138 extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
139 extern void __iounmap(void *addr);
140
141 /*
142 * Generic ioremap support.
143 *
144 * Define:
145 * iomem_valid_addr(off,size)
146 * iomem_to_phys(off)
147 */
148 #ifdef iomem_valid_addr
149 #define __arch_ioremap(off,sz,nocache) \
150 ({ \
151 unsigned long _off = (off), _size = (sz); \
152 void *_ret = (void *)0; \
153 if (iomem_valid_addr(_off, _size)) \
154 _ret = __ioremap(iomem_to_phys(_off),_size,0); \
155 _ret; \
156 })
157
158 #define __arch_iounmap __iounmap
159 #endif
160
161 #define ioremap(off,sz) __arch_ioremap((off),(sz),0)
162 #define ioremap_nocache(off,sz) __arch_ioremap((off),(sz),1)
163 #define iounmap(_addr) __arch_iounmap(_addr)
164
165 /*
166 * DMA-consistent mapping functions. These allocate/free a region of
167 * uncached, unwrite-buffered mapped memory space for use with DMA
168 * devices. This is the "generic" version. The PCI specific version
169 * is in pci.h
170 */
171 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
172 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
173 extern void consistent_sync(void *vaddr, size_t size, int rw);
174
175 /*
176 * String version of IO memory access ops:
177 */
178 extern void _memcpy_fromio(void *, unsigned long, size_t);
179 extern void _memcpy_toio(unsigned long, const void *, size_t);
180 extern void _memset_io(unsigned long, int, size_t);
181
182 extern void __readwrite_bug(const char *fn);
183
184 /*
185 * If this architecture has PCI memory IO, then define the read/write
186 * macros. These should only be used with the cookie passed from
187 * ioremap.
188 */
189 #ifdef __mem_pci
190
191 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
192 #define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
193 #define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
194
195 #define writeb(v,c) __raw_writeb(v,__mem_pci(c))
196 #define writew(v,c) __raw_writew(cpu_to_le16(v),__mem_pci(c))
197 #define writel(v,c) __raw_writel(cpu_to_le32(v),__mem_pci(c))
198
199 #define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
200 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
201 #define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
202
203 #define eth_io_copy_and_sum(s,c,l,b) \
204 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
205
206 static inline int
check_signature(unsigned long io_addr,const unsigned char * signature,int length)207 check_signature(unsigned long io_addr, const unsigned char *signature,
208 int length)
209 {
210 int retval = 0;
211 do {
212 if (readb(io_addr) != *signature)
213 goto out;
214 io_addr++;
215 signature++;
216 length--;
217 } while (length);
218 retval = 1;
219 out:
220 return retval;
221 }
222
223 #elif !defined(readb)
224
225 #define readb(addr) (__readwrite_bug("readb"),0)
226 #define readw(addr) (__readwrite_bug("readw"),0)
227 #define readl(addr) (__readwrite_bug("readl"),0)
228 #define writeb(v,addr) __readwrite_bug("writeb")
229 #define writew(v,addr) __readwrite_bug("writew")
230 #define writel(v,addr) __readwrite_bug("writel")
231
232 #define eth_io_copy_and_sum(a,b,c,d) __readwrite_bug("eth_io_copy_and_sum")
233
234 #define check_signature(io,sig,len) (0)
235
236 #endif /* __mem_pci */
237
238 /*
239 * If this architecture has ISA IO, then define the isa_read/isa_write
240 * macros.
241 */
242 #ifdef __mem_isa
243
244 #define isa_readb(addr) __raw_readb(__mem_isa(addr))
245 #define isa_readw(addr) __raw_readw(__mem_isa(addr))
246 #define isa_readl(addr) __raw_readl(__mem_isa(addr))
247 #define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
248 #define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
249 #define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
250 #define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
251 #define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
252 #define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
253
254 #define isa_eth_io_copy_and_sum(a,b,c,d) \
255 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
256
257 static inline int
isa_check_signature(unsigned long io_addr,const unsigned char * signature,int length)258 isa_check_signature(unsigned long io_addr, const unsigned char *signature,
259 int length)
260 {
261 int retval = 0;
262 do {
263 if (isa_readb(io_addr) != *signature)
264 goto out;
265 io_addr++;
266 signature++;
267 length--;
268 } while (length);
269 retval = 1;
270 out:
271 return retval;
272 }
273
274 #else /* __mem_isa */
275
276 #define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
277 #define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
278 #define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
279 #define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
280 #define isa_writew(val,addr) __readwrite_bug("isa_writew")
281 #define isa_writel(val,addr) __readwrite_bug("isa_writel")
282 #define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
283 #define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
284 #define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
285
286 #define isa_eth_io_copy_and_sum(a,b,c,d) \
287 __readwrite_bug("isa_eth_io_copy_and_sum")
288
289 #define isa_check_signature(io,sig,len) (0)
290
291 #endif /* __mem_isa */
292 #endif /* __KERNEL__ */
293 #endif /* __ASM_ARM_IO_H */
294