2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994, 1995 Waldorf GmbH
7 * Copyright (C) 1994 - 2000 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Copyright (C) 2000 FSMLabs, Inc.
14 #include <linux/config.h>
16 #include <linux/pagemap.h>
18 #include <asm/addrspace.h>
19 #include <asm/byteorder.h>
22 * Slowdown I/O port space accesses for antique hardware.
24 #undef CONF_SLOWDOWN_IO
27 * Sane hardware offers swapping of I/O space accesses in hardware; less
28 * sane hardware forces software to fiddle with this ...
30 #if defined(CONFIG_SWAP_IO_SPACE) && defined(__MIPSEB__)
32 #define __ioswab8(x) (x)
33 #define __ioswab16(x) swab16(x)
34 #define __ioswab32(x) swab32(x)
38 #define __ioswab8(x) (x)
39 #define __ioswab16(x) (x)
40 #define __ioswab32(x) (x)
45 * This file contains the definitions for the MIPS counterpart of the
46 * x86 in/out instructions. This heap of macros and C results in much
47 * better code than the approach of doing it in plain C. The macros
48 * result in code that is to fast for certain hardware. On the other
49 * side the performance of the string functions should be improved for
50 * sake of certain devices like EIDE disks that do highspeed polled I/O.
54 * This file contains the definitions for the x86 IO instructions
55 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
56 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
57 * versions of the single-IO instructions (inb_p/inw_p/..).
59 * This file is not meant to be obfuscating: it's just complicated
60 * to (a) handle it all in a way that makes gcc able to optimize it
61 * as well as possible and (b) trying to avoid writing the same thing
62 * over and over again with slight variations and possibly making a
67 * On MIPS I/O ports are memory mapped, so we access them using normal
68 * load/store instructions. mips_io_port_base is the virtual address to
69 * which all ports are being mapped. For sake of efficiency some code
70 * assumes that this is an address that can be loaded with a single lui
71 * instruction, so the lower 16 bits must be zero. Should be true on
72 * on any sane architecture; generic code does not use this assumption.
74 extern const unsigned long mips_io_port_base;
77 * Gcc will generate code to load the value of mips_io_port_base after each
78 * function call which may be fairly wasteful in some cases. So we don't
79 * play quite by the book. We tell gcc mips_io_port_base is a long variable
80 * which solves the code generation issue. Now we need to violate the
81 * aliasing rules a little to make initialization possible and finally we
82 * will need the barrier() to fight side effects of the aliasing chat.
83 * This trickery will eventually collapse under gcc's optimizer. Oh well.
85 static inline void set_io_port_base(unsigned long base)
87 * (unsigned long *) &mips_io_port_base = base;
91 * Thanks to James van Artsdalen for a better timing-fix than
92 * the two short jumps: using outb's to a nonexistent port seems
93 * to guarantee better timings even on fast machines.
95 * On the other hand, I'd like to be sure of a non-existent port:
96 * I feel a bit unsafe about using 0x80 (should be safe, though)
102 #define __SLOW_DOWN_IO \
103 __asm__ __volatile__( \
105 : : "r" (mips_io_port_base));
107 #ifdef CONF_SLOWDOWN_IO
108 #ifdef REALLY_SLOW_IO
109 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
111 #define SLOW_DOWN_IO __SLOW_DOWN_IO
118 * Change virtual addresses to physical addresses and vv.
119 * These are trivial on the 1:1 Linux/MIPS mapping
121 extern inline phys_addr_t virt_to_phys(volatile void * address)
123 return CPHYSADDR(address);
126 extern inline void * phys_to_virt(unsigned long address)
128 return (void *)KSEG0ADDR(address);
132 * IO bus memory addresses are also 1:1 with the physical address
134 extern inline unsigned long virt_to_bus(volatile void * address)
136 return CPHYSADDR(address);
139 extern inline void * bus_to_virt(unsigned long address)
141 return (void *)KSEG0ADDR(address);
145 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
148 extern unsigned long isa_slot_offset;
150 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
153 extern inline void *ioremap(unsigned long offset, unsigned long size)
155 return __ioremap(offset, size, _CACHE_UNCACHED);
158 extern inline void *ioremap_nocache(unsigned long offset, unsigned long size)
160 return __ioremap(offset, size, _CACHE_UNCACHED);
163 extern void iounmap(void *addr);
167 * XXX We need system specific versions of these to handle EISA address bits
169 * XXX more SNI hacks.
171 #define readb(addr) (*(volatile unsigned char *)(addr))
172 #define readw(addr) __ioswab16((*(volatile unsigned short *)(addr)))
173 #define readl(addr) __ioswab32((*(volatile unsigned int *)(addr)))
174 #define __raw_readb readb
175 #define __raw_readw readw
176 #define __raw_readl readl
178 #define writeb(b,addr) (*(volatile unsigned char *)(addr)) = (b)
179 #define writew(b,addr) (*(volatile unsigned short *)(addr)) = (__ioswab16(b))
180 #define writel(b,addr) (*(volatile unsigned int *)(addr)) = (__ioswab32(b))
181 #define __raw_writeb writeb
182 #define __raw_writew writew
183 #define __raw_writel writel
185 #define memset_io(a,b,c) memset((void *)(a),(b),(c))
186 #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
187 #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
189 /* END SNI HACKS ... */
192 * ISA space is 'always mapped' on currently supported MIPS systems, no need
193 * to explicitly ioremap() it. The fact that the ISA IO space is mapped
194 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
195 * are physical addresses. The following constant pointer can be
196 * used as the IO-area pointer (it can be iounmapped as well, so the
197 * analogy with PCI is quite large):
199 #define __ISA_IO_base ((char *)(PAGE_OFFSET))
201 #define isa_readb(a) readb(a)
202 #define isa_readw(a) readw(a)
203 #define isa_readl(a) readl(a)
204 #define isa_writeb(b,a) writeb(b,a)
205 #define isa_writew(w,a) writew(w,a)
206 #define isa_writel(l,a) writel(l,a)
208 #define isa_memset_io(a,b,c) memset_io((a),(b),(c))
209 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
210 #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
213 * We don't have csum_partial_copy_fromio() yet, so we cheat here and
214 * just copy it. The net code will then do the checksum later.
216 #define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len))
217 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d))
219 static inline int check_signature(unsigned long io_addr,
220 const unsigned char *signature, int length)
224 if (readb(io_addr) != *signature)
234 #define isa_check_signature(io, s, l) check_signature(i,s,l)
237 * Talk about misusing macros..
241 extern inline void __out##s(unsigned int value, unsigned int port) {
244 __asm__ __volatile__ ("s" #m "\t%0,%1(%2)"
246 #define __OUT(m,s,w) \
247 __OUT1(s) __OUT2(m) : : "r" (__ioswab##w(value)), "i" (0), "r" (mips_io_port_base+port)); } \
248 __OUT1(s##c) __OUT2(m) : : "r" (__ioswab##w(value)), "ir" (port), "r" (mips_io_port_base)); } \
249 __OUT1(s##_p) __OUT2(m) : : "r" (__ioswab##w(value)), "i" (0), "r" (mips_io_port_base+port)); \
251 __OUT1(s##c_p) __OUT2(m) : : "r" (__ioswab##w(value)), "ir" (port), "r" (mips_io_port_base)); \
255 extern __inline__ t __in##s(unsigned int port) { t _v;
258 * Required nops will be inserted by the assembler
261 __asm__ __volatile__ ("l" #m "\t%0,%1(%2)"
263 #define __IN(t,m,s,w) \
264 __IN1(t,s) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); return __ioswab##w(_v); } \
265 __IN1(t,s##c) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); return __ioswab##w(_v); } \
266 __IN1(t,s##_p) __IN2(m) : "=r" (_v) : "i" (0), "r" (mips_io_port_base+port)); SLOW_DOWN_IO; return __ioswab##w(_v); } \
267 __IN1(t,s##c_p) __IN2(m) : "=r" (_v) : "ir" (port), "r" (mips_io_port_base)); SLOW_DOWN_IO; return __ioswab##w(_v); }
270 extern inline void __ins##s(unsigned int port, void * addr, unsigned long count) {
274 __asm__ __volatile__ ( \
275 ".set\tnoreorder\n\t" \
277 "1:\tl" #m "\t$1,%4(%5)\n\t" \
279 "s" #m "\t$1,(%0)\n\t" \
280 "bne\t$0,%1,1b\n\t" \
285 #define __INS(m,s,i) \
286 __INS1(s) __INS2(m) \
287 : "=r" (addr), "=r" (count) \
288 : "0" (addr), "1" (count), "i" (0), \
289 "r" (mips_io_port_base+port), "I" (i) \
291 __INS1(s##c) __INS2(m) \
292 : "=r" (addr), "=r" (count) \
293 : "0" (addr), "1" (count), "ir" (port), \
294 "r" (mips_io_port_base), "I" (i) \
298 extern inline void __outs##s(unsigned int port, const void * addr, unsigned long count) {
302 __asm__ __volatile__ ( \
303 ".set\tnoreorder\n\t" \
305 "1:\tl" #m "\t$1,(%0)\n\t" \
307 "s" #m "\t$1,%4(%5)\n\t" \
308 "bne\t$0,%1,1b\n\t" \
313 #define __OUTS(m,s,i) \
314 __OUTS1(s) __OUTS2(m) \
315 : "=r" (addr), "=r" (count) \
316 : "0" (addr), "1" (count), "i" (0), "r" (mips_io_port_base+port), "I" (i) \
318 __OUTS1(s##c) __OUTS2(m) \
319 : "=r" (addr), "=r" (count) \
320 : "0" (addr), "1" (count), "ir" (port), "r" (mips_io_port_base), "I" (i) \
323 __IN(unsigned char,b,b,8)
324 __IN(unsigned short,h,w,16)
325 __IN(unsigned int,w,l,32)
341 * Note that due to the way __builtin_constant_p() works, you
342 * - can't use it inside an inline function (it will never be true)
343 * - you don't have to worry about side effects within the __builtin..
345 #define outb(val,port) \
346 ((__builtin_constant_p((port)) && (port) < 32768) ? \
347 __outbc((val),(port)) : \
348 __outb((val),(port)))
351 ((__builtin_constant_p((port)) && (port) < 32768) ? \
355 #define outb_p(val,port) \
356 ((__builtin_constant_p((port)) && (port) < 32768) ? \
357 __outbc_p((val),(port)) : \
358 __outb_p((val),(port)))
360 #define inb_p(port) \
361 ((__builtin_constant_p((port)) && (port) < 32768) ? \
365 #define outw(val,port) \
366 ((__builtin_constant_p((port)) && (port) < 32768) ? \
367 __outwc((val),(port)) : \
368 __outw((val),(port)))
371 ((__builtin_constant_p((port)) && (port) < 32768) ? \
375 #define outw_p(val,port) \
376 ((__builtin_constant_p((port)) && (port) < 32768) ? \
377 __outwc_p((val),(port)) : \
378 __outw_p((val),(port)))
380 #define inw_p(port) \
381 ((__builtin_constant_p((port)) && (port) < 32768) ? \
385 #define outl(val,port) \
386 ((__builtin_constant_p((port)) && (port) < 32768) ? \
387 __outlc((val),(port)) : \
388 __outl((val),(port)))
391 ((__builtin_constant_p((port)) && (port) < 32768) ? \
395 #define outl_p(val,port) \
396 ((__builtin_constant_p((port)) && (port) < 32768) ? \
397 __outlc_p((val),(port)) : \
398 __outl_p((val),(port)))
400 #define inl_p(port) \
401 ((__builtin_constant_p((port)) && (port) < 32768) ? \
406 #define outsb(port,addr,count) \
407 ((__builtin_constant_p((port)) && (port) < 32768) ? \
408 __outsbc((port),(addr),(count)) : \
409 __outsb ((port),(addr),(count)))
411 #define insb(port,addr,count) \
412 ((__builtin_constant_p((port)) && (port) < 32768) ? \
413 __insbc((port),(addr),(count)) : \
414 __insb((port),(addr),(count)))
416 #define outsw(port,addr,count) \
417 ((__builtin_constant_p((port)) && (port) < 32768) ? \
418 __outswc((port),(addr),(count)) : \
419 __outsw ((port),(addr),(count)))
421 #define insw(port,addr,count) \
422 ((__builtin_constant_p((port)) && (port) < 32768) ? \
423 __inswc((port),(addr),(count)) : \
424 __insw((port),(addr),(count)))
426 #define outsl(port,addr,count) \
427 ((__builtin_constant_p((port)) && (port) < 32768) ? \
428 __outslc((port),(addr),(count)) : \
429 __outsl ((port),(addr),(count)))
431 #define insl(port,addr,count) \
432 ((__builtin_constant_p((port)) && (port) < 32768) ? \
433 __inslc((port),(addr),(count)) : \
434 __insl((port),(addr),(count)))
436 #define IO_SPACE_LIMIT 0xffff
439 * The caches on some architectures aren't dma-coherent and have need to
440 * handle this in software. There are three types of operations that
441 * can be applied to dma buffers.
443 * - dma_cache_wback_inv(start, size) makes caches and coherent by
444 * writing the content of the caches back to memory, if necessary.
445 * The function also invalidates the affected part of the caches as
446 * necessary before DMA transfers from outside to memory.
447 * - dma_cache_wback(start, size) makes caches and coherent by
448 * writing the content of the caches back to memory, if necessary.
449 * The function also invalidates the affected part of the caches as
450 * necessary before DMA transfers from outside to memory.
451 * - dma_cache_inv(start, size) invalidates the affected parts of the
452 * caches. Dirty lines of the caches may be written back or simply
453 * be discarded. This operation is necessary before dma operations
456 extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
457 extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
458 extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
460 #define dma_cache_wback_inv(start,size) _dma_cache_wback_inv(start,size)
461 #define dma_cache_wback(start,size) _dma_cache_wback(start,size)
462 #define dma_cache_inv(start,size) _dma_cache_inv(start,size)
464 static inline void sync(void)
469 * Given a physical address and a length, return a virtual address
470 * that can be used to access the memory range with the caching
471 * properties specified by "flags".
473 #define MAP_NOCACHE (0)
474 #define MAP_WRCOMBINE (0)
475 #define MAP_WRBACK (0)
476 #define MAP_WRTHROUGH (0)
479 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
481 return (void *)paddr;
485 * Take down a mapping set up by map_physmem().
487 static inline void unmap_physmem(void *vaddr, unsigned long flags)
492 #endif /* _ASM_IO_H */