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Linux 2.6.25.3
[linux/fpc-iii.git] / include / asm-mips / io.h
blobe62058b0d28c37c48d7a71c40c7271322fed5e63
1 /*
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
4 * for more details.
5 *
6 * Copyright (C) 1994, 1995 Waldorf GmbH
7 * Copyright (C) 1994 - 2000, 06 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
10 * Author: Maciej W. Rozycki <macro@mips.com>
11 */
12 #ifndef _ASM_IO_H
13 #define _ASM_IO_H
14
15 #include <linux/compiler.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18
19 #include <asm/addrspace.h>
20 #include <asm/byteorder.h>
21 #include <asm/cpu.h>
22 #include <asm/cpu-features.h>
23 #include <asm-generic/iomap.h>
24 #include <asm/page.h>
25 #include <asm/pgtable-bits.h>
26 #include <asm/processor.h>
27 #include <asm/string.h>
28
29 #include <ioremap.h>
30 #include <mangle-port.h>
31
32 /*
33 * Slowdown I/O port space accesses for antique hardware.
34 */
35 #undef CONF_SLOWDOWN_IO
36
37 /*
38 * Raw operations are never swapped in software. OTOH values that raw
39 * operations are working on may or may not have been swapped by the bus
40 * hardware. An example use would be for flash memory that's used for
41 * execute in place.
42 */
43 # define __raw_ioswabb(a, x) (x)
44 # define __raw_ioswabw(a, x) (x)
45 # define __raw_ioswabl(a, x) (x)
46 # define __raw_ioswabq(a, x) (x)
47 # define ____raw_ioswabq(a, x) (x)
48
49 /* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
50
51 #define IO_SPACE_LIMIT 0xffff
52
53 /*
54 * On MIPS I/O ports are memory mapped, so we access them using normal
55 * load/store instructions. mips_io_port_base is the virtual address to
56 * which all ports are being mapped. For sake of efficiency some code
57 * assumes that this is an address that can be loaded with a single lui
58 * instruction, so the lower 16 bits must be zero. Should be true on
59 * on any sane architecture; generic code does not use this assumption.
60 */
61 extern const unsigned long mips_io_port_base;
62
63 /*
64 * Gcc will generate code to load the value of mips_io_port_base after each
65 * function call which may be fairly wasteful in some cases. So we don't
66 * play quite by the book. We tell gcc mips_io_port_base is a long variable
67 * which solves the code generation issue. Now we need to violate the
68 * aliasing rules a little to make initialization possible and finally we
69 * will need the barrier() to fight side effects of the aliasing chat.
70 * This trickery will eventually collapse under gcc's optimizer. Oh well.
71 */
72 static inline void set_io_port_base(unsigned long base)
73 {
74 * (unsigned long *) &mips_io_port_base = base;
75 barrier();
76 }
77
78 /*
79 * Thanks to James van Artsdalen for a better timing-fix than
80 * the two short jumps: using outb's to a nonexistent port seems
81 * to guarantee better timings even on fast machines.
82 *
83 * On the other hand, I'd like to be sure of a non-existent port:
84 * I feel a bit unsafe about using 0x80 (should be safe, though)
85 *
86 * Linus
87 *
88 */
89
90 #define __SLOW_DOWN_IO \
91 __asm__ __volatile__( \
92 "sb\t$0,0x80(%0)" \
93 : : "r" (mips_io_port_base));
94
95 #ifdef CONF_SLOWDOWN_IO
96 #ifdef REALLY_SLOW_IO
97 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
98 #else
99 #define SLOW_DOWN_IO __SLOW_DOWN_IO
100 #endif
101 #else
102 #define SLOW_DOWN_IO
103 #endif
104
105 /*
106 * virt_to_phys - map virtual addresses to physical
107 * @address: address to remap
108 *
109 * The returned physical address is the physical (CPU) mapping for
110 * the memory address given. It is only valid to use this function on
111 * addresses directly mapped or allocated via kmalloc.
112 *
113 * This function does not give bus mappings for DMA transfers. In
114 * almost all conceivable cases a device driver should not be using
115 * this function
116 */
117 static inline unsigned long virt_to_phys(volatile const void *address)
118 {
119 return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET;
120 }
121
122 /*
123 * phys_to_virt - map physical address to virtual
124 * @address: address to remap
125 *
126 * The returned virtual address is a current CPU mapping for
127 * the memory address given. It is only valid to use this function on
128 * addresses that have a kernel mapping
129 *
130 * This function does not handle bus mappings for DMA transfers. In
131 * almost all conceivable cases a device driver should not be using
132 * this function
133 */
134 static inline void * phys_to_virt(unsigned long address)
135 {
136 return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);
137 }
138
139 /*
140 * ISA I/O bus memory addresses are 1:1 with the physical address.
141 */
142 static inline unsigned long isa_virt_to_bus(volatile void * address)
143 {
144 return (unsigned long)address - PAGE_OFFSET;
145 }
146
147 static inline void * isa_bus_to_virt(unsigned long address)
148 {
149 return (void *)(address + PAGE_OFFSET);
150 }
151
152 #define isa_page_to_bus page_to_phys
153
154 /*
155 * However PCI ones are not necessarily 1:1 and therefore these interfaces
156 * are forbidden in portable PCI drivers.
157 *
158 * Allow them for x86 for legacy drivers, though.
159 */
160 #define virt_to_bus virt_to_phys
161 #define bus_to_virt phys_to_virt
162
163 /*
164 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
165 * for the processor. This implies the assumption that there is only
166 * one of these busses.
167 */
168 extern unsigned long isa_slot_offset;
169
170 /*
171 * Change "struct page" to physical address.
172 */
173 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
174
175 extern void __iomem * __ioremap(phys_t offset, phys_t size, unsigned long flags);
176 extern void __iounmap(const volatile void __iomem *addr);
177
178 static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size,
179 unsigned long flags)
180 {
181 void __iomem *addr = plat_ioremap(offset, size, flags);
182
183 if (addr)
184 return addr;
185
186 #define __IS_LOW512(addr) (!((phys_t)(addr) & (phys_t) ~0x1fffffffULL))
187
188 if (cpu_has_64bit_addresses) {
189 u64 base = UNCAC_BASE;
190
191 /*
192 * R10000 supports a 2 bit uncached attribute therefore
193 * UNCAC_BASE may not equal IO_BASE.
194 */
195 if (flags == _CACHE_UNCACHED)
196 base = (u64) IO_BASE;
197 return (void __iomem *) (unsigned long) (base + offset);
198 } else if (__builtin_constant_p(offset) &&
199 __builtin_constant_p(size) && __builtin_constant_p(flags)) {
200 phys_t phys_addr, last_addr;
201
202 phys_addr = fixup_bigphys_addr(offset, size);
203
204 /* Don't allow wraparound or zero size. */
205 last_addr = phys_addr + size - 1;
206 if (!size || last_addr < phys_addr)
207 return NULL;
208
209 /*
210 * Map uncached objects in the low 512MB of address
211 * space using KSEG1.
212 */
213 if (__IS_LOW512(phys_addr) && __IS_LOW512(last_addr) &&
214 flags == _CACHE_UNCACHED)
215 return (void __iomem *)
216 (unsigned long)CKSEG1ADDR(phys_addr);
217 }
218
219 return __ioremap(offset, size, flags);
220
221 #undef __IS_LOW512
222 }
223
224 /*
225 * ioremap - map bus memory into CPU space
226 * @offset: bus address of the memory
227 * @size: size of the resource to map
228 *
229 * ioremap performs a platform specific sequence of operations to
230 * make bus memory CPU accessible via the readb/readw/readl/writeb/
231 * writew/writel functions and the other mmio helpers. The returned
232 * address is not guaranteed to be usable directly as a virtual
233 * address.
234 */
235 #define ioremap(offset, size) \
236 __ioremap_mode((offset), (size), _CACHE_UNCACHED)
237
238 /*
239 * ioremap_nocache - map bus memory into CPU space
240 * @offset: bus address of the memory
241 * @size: size of the resource to map
242 *
243 * ioremap_nocache performs a platform specific sequence of operations to
244 * make bus memory CPU accessible via the readb/readw/readl/writeb/
245 * writew/writel functions and the other mmio helpers. The returned
246 * address is not guaranteed to be usable directly as a virtual
247 * address.
248 *
249 * This version of ioremap ensures that the memory is marked uncachable
250 * on the CPU as well as honouring existing caching rules from things like
251 * the PCI bus. Note that there are other caches and buffers on many
252 * busses. In paticular driver authors should read up on PCI writes
253 *
254 * It's useful if some control registers are in such an area and
255 * write combining or read caching is not desirable:
256 */
257 #define ioremap_nocache(offset, size) \
258 __ioremap_mode((offset), (size), _CACHE_UNCACHED)
259
260 /*
261 * ioremap_cachable - map bus memory into CPU space
262 * @offset: bus address of the memory
263 * @size: size of the resource to map
264 *
265 * ioremap_nocache performs a platform specific sequence of operations to
266 * make bus memory CPU accessible via the readb/readw/readl/writeb/
267 * writew/writel functions and the other mmio helpers. The returned
268 * address is not guaranteed to be usable directly as a virtual
269 * address.
270 *
271 * This version of ioremap ensures that the memory is marked cachable by
272 * the CPU. Also enables full write-combining. Useful for some
273 * memory-like regions on I/O busses.
274 */
275 #define ioremap_cachable(offset, size) \
276 __ioremap_mode((offset), (size), PAGE_CACHABLE_DEFAULT)
277
278 /*
279 * These two are MIPS specific ioremap variant. ioremap_cacheable_cow
280 * requests a cachable mapping, ioremap_uncached_accelerated requests a
281 * mapping using the uncached accelerated mode which isn't supported on
282 * all processors.
283 */
284 #define ioremap_cacheable_cow(offset, size) \
285 __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
286 #define ioremap_uncached_accelerated(offset, size) \
287 __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
288
289 static inline void iounmap(const volatile void __iomem *addr)
290 {
291 if (plat_iounmap(addr))
292 return;
293
294 #define __IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
295
296 if (cpu_has_64bit_addresses ||
297 (__builtin_constant_p(addr) && __IS_KSEG1(addr)))
298 return;
299
300 __iounmap(addr);
301
302 #undef __IS_KSEG1
303 }
304
305 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \
306 \
307 static inline void pfx##write##bwlq(type val, \
308 volatile void __iomem *mem) \
309 { \
310 volatile type *__mem; \
311 type __val; \
312 \
313 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
314 \
315 __val = pfx##ioswab##bwlq(__mem, val); \
316 \
317 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
318 *__mem = __val; \
319 else if (cpu_has_64bits) { \
320 unsigned long __flags; \
321 type __tmp; \
322 \
323 if (irq) \
324 local_irq_save(__flags); \
325 __asm__ __volatile__( \
326 ".set mips3" "\t\t# __writeq""\n\t" \
327 "dsll32 %L0, %L0, 0" "\n\t" \
328 "dsrl32 %L0, %L0, 0" "\n\t" \
329 "dsll32 %M0, %M0, 0" "\n\t" \
330 "or %L0, %L0, %M0" "\n\t" \
331 "sd %L0, %2" "\n\t" \
332 ".set mips0" "\n" \
333 : "=r" (__tmp) \
334 : "0" (__val), "m" (*__mem)); \
335 if (irq) \
336 local_irq_restore(__flags); \
337 } else \
338 BUG(); \
339 } \
340 \
341 static inline type pfx##read##bwlq(const volatile void __iomem *mem) \
342 { \
343 volatile type *__mem; \
344 type __val; \
345 \
346 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
347 \
348 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
349 __val = *__mem; \
350 else if (cpu_has_64bits) { \
351 unsigned long __flags; \
352 \
353 if (irq) \
354 local_irq_save(__flags); \
355 __asm__ __volatile__( \
356 ".set mips3" "\t\t# __readq" "\n\t" \
357 "ld %L0, %1" "\n\t" \
358 "dsra32 %M0, %L0, 0" "\n\t" \
359 "sll %L0, %L0, 0" "\n\t" \
360 ".set mips0" "\n" \
361 : "=r" (__val) \
362 : "m" (*__mem)); \
363 if (irq) \
364 local_irq_restore(__flags); \
365 } else { \
366 __val = 0; \
367 BUG(); \
368 } \
369 \
370 return pfx##ioswab##bwlq(__mem, __val); \
371 }
372
373 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow) \
374 \
375 static inline void pfx##out##bwlq##p(type val, unsigned long port) \
376 { \
377 volatile type *__addr; \
378 type __val; \
379 \
380 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
381 \
382 __val = pfx##ioswab##bwlq(__addr, val); \
383 \
384 /* Really, we want this to be atomic */ \
385 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
386 \
387 *__addr = __val; \
388 slow; \
389 } \
390 \
391 static inline type pfx##in##bwlq##p(unsigned long port) \
392 { \
393 volatile type *__addr; \
394 type __val; \
395 \
396 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
397 \
398 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
399 \
400 __val = *__addr; \
401 slow; \
402 \
403 return pfx##ioswab##bwlq(__addr, __val); \
404 }
405
406 #define __BUILD_MEMORY_PFX(bus, bwlq, type) \
407 \
408 __BUILD_MEMORY_SINGLE(bus, bwlq, type, 1)
409
410 #define BUILDIO_MEM(bwlq, type) \
411 \
412 __BUILD_MEMORY_PFX(__raw_, bwlq, type) \
413 __BUILD_MEMORY_PFX(, bwlq, type) \
414 __BUILD_MEMORY_PFX(__mem_, bwlq, type) \
415
416 BUILDIO_MEM(b, u8)
417 BUILDIO_MEM(w, u16)
418 BUILDIO_MEM(l, u32)
419 BUILDIO_MEM(q, u64)
420
421 #define __BUILD_IOPORT_PFX(bus, bwlq, type) \
422 __BUILD_IOPORT_SINGLE(bus, bwlq, type, ,) \
423 __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
424
425 #define BUILDIO_IOPORT(bwlq, type) \
426 __BUILD_IOPORT_PFX(, bwlq, type) \
427 __BUILD_IOPORT_PFX(__mem_, bwlq, type)
428
429 BUILDIO_IOPORT(b, u8)
430 BUILDIO_IOPORT(w, u16)
431 BUILDIO_IOPORT(l, u32)
432 #ifdef CONFIG_64BIT
433 BUILDIO_IOPORT(q, u64)
434 #endif
435
436 #define __BUILDIO(bwlq, type) \
437 \
438 __BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0)
439
440 __BUILDIO(q, u64)
441
442 #define readb_relaxed readb
443 #define readw_relaxed readw
444 #define readl_relaxed readl
445 #define readq_relaxed readq
446
447 /*
448 * Some code tests for these symbols
449 */
450 #define readq readq
451 #define writeq writeq
452
453 #define __BUILD_MEMORY_STRING(bwlq, type) \
454 \
455 static inline void writes##bwlq(volatile void __iomem *mem, \
456 const void *addr, unsigned int count) \
457 { \
458 const volatile type *__addr = addr; \
459 \
460 while (count--) { \
461 __mem_write##bwlq(*__addr, mem); \
462 __addr++; \
463 } \
464 } \
465 \
466 static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \
467 unsigned int count) \
468 { \
469 volatile type *__addr = addr; \
470 \
471 while (count--) { \
472 *__addr = __mem_read##bwlq(mem); \
473 __addr++; \
474 } \
475 }
476
477 #define __BUILD_IOPORT_STRING(bwlq, type) \
478 \
479 static inline void outs##bwlq(unsigned long port, const void *addr, \
480 unsigned int count) \
481 { \
482 const volatile type *__addr = addr; \
483 \
484 while (count--) { \
485 __mem_out##bwlq(*__addr, port); \
486 __addr++; \
487 } \
488 } \
489 \
490 static inline void ins##bwlq(unsigned long port, void *addr, \
491 unsigned int count) \
492 { \
493 volatile type *__addr = addr; \
494 \
495 while (count--) { \
496 *__addr = __mem_in##bwlq(port); \
497 __addr++; \
498 } \
499 }
500
501 #define BUILDSTRING(bwlq, type) \
502 \
503 __BUILD_MEMORY_STRING(bwlq, type) \
504 __BUILD_IOPORT_STRING(bwlq, type)
505
506 BUILDSTRING(b, u8)
507 BUILDSTRING(w, u16)
508 BUILDSTRING(l, u32)
509 #ifdef CONFIG_64BIT
510 BUILDSTRING(q, u64)
511 #endif
512
513
514 /* Depends on MIPS II instruction set */
515 #define mmiowb() asm volatile ("sync" ::: "memory")
516
517 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
518 {
519 memset((void __force *) addr, val, count);
520 }
521 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
522 {
523 memcpy(dst, (void __force *) src, count);
524 }
525 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
526 {
527 memcpy((void __force *) dst, src, count);
528 }
529
530 /*
531 * ISA space is 'always mapped' on currently supported MIPS systems, no need
532 * to explicitly ioremap() it. The fact that the ISA IO space is mapped
533 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
534 * are physical addresses. The following constant pointer can be
535 * used as the IO-area pointer (it can be iounmapped as well, so the
536 * analogy with PCI is quite large):
537 */
538 #define __ISA_IO_base ((char *)(isa_slot_offset))
539
540 /*
541 * The caches on some architectures aren't dma-coherent and have need to
542 * handle this in software. There are three types of operations that
543 * can be applied to dma buffers.
544 *
545 * - dma_cache_wback_inv(start, size) makes caches and coherent by
546 * writing the content of the caches back to memory, if necessary.
547 * The function also invalidates the affected part of the caches as
548 * necessary before DMA transfers from outside to memory.
549 * - dma_cache_wback(start, size) makes caches and coherent by
550 * writing the content of the caches back to memory, if necessary.
551 * The function also invalidates the affected part of the caches as
552 * necessary before DMA transfers from outside to memory.
553 * - dma_cache_inv(start, size) invalidates the affected parts of the
554 * caches. Dirty lines of the caches may be written back or simply
555 * be discarded. This operation is necessary before dma operations
556 * to the memory.
557 *
558 * This API used to be exported; it now is for arch code internal use only.
559 */
560 #ifdef CONFIG_DMA_NONCOHERENT
561
562 extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
563 extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
564 extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
565
566 #define dma_cache_wback_inv(start, size) _dma_cache_wback_inv(start, size)
567 #define dma_cache_wback(start, size) _dma_cache_wback(start, size)
568 #define dma_cache_inv(start, size) _dma_cache_inv(start, size)
569
570 #else /* Sane hardware */
571
572 #define dma_cache_wback_inv(start,size) \
573 do { (void) (start); (void) (size); } while (0)
574 #define dma_cache_wback(start,size) \
575 do { (void) (start); (void) (size); } while (0)
576 #define dma_cache_inv(start,size) \
577 do { (void) (start); (void) (size); } while (0)
578
579 #endif /* CONFIG_DMA_NONCOHERENT */
580
581 /*
582 * Read a 32-bit register that requires a 64-bit read cycle on the bus.
583 * Avoid interrupt mucking, just adjust the address for 4-byte access.
584 * Assume the addresses are 8-byte aligned.
585 */
586 #ifdef __MIPSEB__
587 #define __CSR_32_ADJUST 4
588 #else
589 #define __CSR_32_ADJUST 0
590 #endif
591
592 #define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
593 #define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
594
595 /*
596 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
597 * access
598 */
599 #define xlate_dev_mem_ptr(p) __va(p)
600
601 /*
602 * Convert a virtual cached pointer to an uncached pointer
603 */
604 #define xlate_dev_kmem_ptr(p) p
605
606 #endif /* _ASM_IO_H */
Linux with added FPC-III support