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[PATCH] efs: Remove incorrect unlock_kernel from failure path in efs_symlink_readpage()
[linux-2.6.git] / include / asm-mips / io.h
blobdf624e1ee6e2eb278931b6ecf56e3a5ea494dbcd
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/page.h>
24 #include <asm/pgtable-bits.h>
25 #include <asm/processor.h>
26 #include <asm/string.h>
27
28 #include <ioremap.h>
29 #include <mangle-port.h>
30
31 /*
32 * Slowdown I/O port space accesses for antique hardware.
33 */
34 #undef CONF_SLOWDOWN_IO
35
36 /*
37 * Raw operations are never swapped in software. OTOH values that raw
38 * operations are working on may or may not have been swapped by the bus
39 * hardware. An example use would be for flash memory that's used for
40 * execute in place.
41 */
42 # define __raw_ioswabb(a,x) (x)
43 # define __raw_ioswabw(a,x) (x)
44 # define __raw_ioswabl(a,x) (x)
45 # define __raw_ioswabq(a,x) (x)
46 # define ____raw_ioswabq(a,x) (x)
47
48 /* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
49
50 #define IO_SPACE_LIMIT 0xffff
51
52 /*
53 * On MIPS I/O ports are memory mapped, so we access them using normal
54 * load/store instructions. mips_io_port_base is the virtual address to
55 * which all ports are being mapped. For sake of efficiency some code
56 * assumes that this is an address that can be loaded with a single lui
57 * instruction, so the lower 16 bits must be zero. Should be true on
58 * on any sane architecture; generic code does not use this assumption.
59 */
60 extern const unsigned long mips_io_port_base;
61
62 /*
63 * Gcc will generate code to load the value of mips_io_port_base after each
64 * function call which may be fairly wasteful in some cases. So we don't
65 * play quite by the book. We tell gcc mips_io_port_base is a long variable
66 * which solves the code generation issue. Now we need to violate the
67 * aliasing rules a little to make initialization possible and finally we
68 * will need the barrier() to fight side effects of the aliasing chat.
69 * This trickery will eventually collapse under gcc's optimizer. Oh well.
70 */
71 static inline void set_io_port_base(unsigned long base)
72 {
73 * (unsigned long *) &mips_io_port_base = base;
74 barrier();
75 }
76
77 /*
78 * Thanks to James van Artsdalen for a better timing-fix than
79 * the two short jumps: using outb's to a nonexistent port seems
80 * to guarantee better timings even on fast machines.
81 *
82 * On the other hand, I'd like to be sure of a non-existent port:
83 * I feel a bit unsafe about using 0x80 (should be safe, though)
84 *
85 * Linus
86 *
87 */
88
89 #define __SLOW_DOWN_IO \
90 __asm__ __volatile__( \
91 "sb\t$0,0x80(%0)" \
92 : : "r" (mips_io_port_base));
93
94 #ifdef CONF_SLOWDOWN_IO
95 #ifdef REALLY_SLOW_IO
96 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
97 #else
98 #define SLOW_DOWN_IO __SLOW_DOWN_IO
99 #endif
100 #else
101 #define SLOW_DOWN_IO
102 #endif
103
104 /*
105 * virt_to_phys - map virtual addresses to physical
106 * @address: address to remap
107 *
108 * The returned physical address is the physical (CPU) mapping for
109 * the memory address given. It is only valid to use this function on
110 * addresses directly mapped or allocated via kmalloc.
111 *
112 * This function does not give bus mappings for DMA transfers. In
113 * almost all conceivable cases a device driver should not be using
114 * this function
115 */
116 static inline unsigned long virt_to_phys(volatile void * address)
117 {
118 return (unsigned long)address - PAGE_OFFSET;
119 }
120
121 /*
122 * phys_to_virt - map physical address to virtual
123 * @address: address to remap
124 *
125 * The returned virtual address is a current CPU mapping for
126 * the memory address given. It is only valid to use this function on
127 * addresses that have a kernel mapping
128 *
129 * This function does not handle bus mappings for DMA transfers. In
130 * almost all conceivable cases a device driver should not be using
131 * this function
132 */
133 static inline void * phys_to_virt(unsigned long address)
134 {
135 return (void *)(address + PAGE_OFFSET);
136 }
137
138 /*
139 * ISA I/O bus memory addresses are 1:1 with the physical address.
140 */
141 static inline unsigned long isa_virt_to_bus(volatile void * address)
142 {
143 return (unsigned long)address - PAGE_OFFSET;
144 }
145
146 static inline void * isa_bus_to_virt(unsigned long address)
147 {
148 return (void *)(address + PAGE_OFFSET);
149 }
150
151 #define isa_page_to_bus page_to_phys
152
153 /*
154 * However PCI ones are not necessarily 1:1 and therefore these interfaces
155 * are forbidden in portable PCI drivers.
156 *
157 * Allow them for x86 for legacy drivers, though.
158 */
159 #define virt_to_bus virt_to_phys
160 #define bus_to_virt phys_to_virt
161
162 /*
163 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
164 * for the processor. This implies the assumption that there is only
165 * one of these busses.
166 */
167 extern unsigned long isa_slot_offset;
168
169 /*
170 * Change "struct page" to physical address.
171 */
172 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
173
174 extern void __iomem * __ioremap(phys_t offset, phys_t size, unsigned long flags);
175 extern void __iounmap(volatile void __iomem *addr);
176
177 static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size,
178 unsigned long flags)
179 {
180 #define __IS_LOW512(addr) (!((phys_t)(addr) & (phys_t) ~0x1fffffffULL))
181
182 if (cpu_has_64bit_addresses) {
183 u64 base = UNCAC_BASE;
184
185 /*
186 * R10000 supports a 2 bit uncached attribute therefore
187 * UNCAC_BASE may not equal IO_BASE.
188 */
189 if (flags == _CACHE_UNCACHED)
190 base = (u64) IO_BASE;
191 return (void __iomem *) (unsigned long) (base + offset);
192 } else if (__builtin_constant_p(offset) &&
193 __builtin_constant_p(size) && __builtin_constant_p(flags)) {
194 phys_t phys_addr, last_addr;
195
196 phys_addr = fixup_bigphys_addr(offset, size);
197
198 /* Don't allow wraparound or zero size. */
199 last_addr = phys_addr + size - 1;
200 if (!size || last_addr < phys_addr)
201 return NULL;
202
203 /*
204 * Map uncached objects in the low 512MB of address
205 * space using KSEG1.
206 */
207 if (__IS_LOW512(phys_addr) && __IS_LOW512(last_addr) &&
208 flags == _CACHE_UNCACHED)
209 return (void __iomem *)CKSEG1ADDR(phys_addr);
210 }
211
212 return __ioremap(offset, size, flags);
213
214 #undef __IS_LOW512
215 }
216
217 /*
218 * ioremap - map bus memory into CPU space
219 * @offset: bus address of the memory
220 * @size: size of the resource to map
221 *
222 * ioremap performs a platform specific sequence of operations to
223 * make bus memory CPU accessible via the readb/readw/readl/writeb/
224 * writew/writel functions and the other mmio helpers. The returned
225 * address is not guaranteed to be usable directly as a virtual
226 * address.
227 */
228 #define ioremap(offset, size) \
229 __ioremap_mode((offset), (size), _CACHE_UNCACHED)
230
231 /*
232 * ioremap_nocache - map bus memory into CPU space
233 * @offset: bus address of the memory
234 * @size: size of the resource to map
235 *
236 * ioremap_nocache performs a platform specific sequence of operations to
237 * make bus memory CPU accessible via the readb/readw/readl/writeb/
238 * writew/writel functions and the other mmio helpers. The returned
239 * address is not guaranteed to be usable directly as a virtual
240 * address.
241 *
242 * This version of ioremap ensures that the memory is marked uncachable
243 * on the CPU as well as honouring existing caching rules from things like
244 * the PCI bus. Note that there are other caches and buffers on many
245 * busses. In paticular driver authors should read up on PCI writes
246 *
247 * It's useful if some control registers are in such an area and
248 * write combining or read caching is not desirable:
249 */
250 #define ioremap_nocache(offset, size) \
251 __ioremap_mode((offset), (size), _CACHE_UNCACHED)
252
253 /*
254 * ioremap_cachable - map bus memory into CPU space
255 * @offset: bus address of the memory
256 * @size: size of the resource to map
257 *
258 * ioremap_nocache performs a platform specific sequence of operations to
259 * make bus memory CPU accessible via the readb/readw/readl/writeb/
260 * writew/writel functions and the other mmio helpers. The returned
261 * address is not guaranteed to be usable directly as a virtual
262 * address.
263 *
264 * This version of ioremap ensures that the memory is marked cachable by
265 * the CPU. Also enables full write-combining. Useful for some
266 * memory-like regions on I/O busses.
267 */
268 #define ioremap_cachable(offset, size) \
269 __ioremap_mode((offset), (size), PAGE_CACHABLE_DEFAULT)
270
271 /*
272 * These two are MIPS specific ioremap variant. ioremap_cacheable_cow
273 * requests a cachable mapping, ioremap_uncached_accelerated requests a
274 * mapping using the uncached accelerated mode which isn't supported on
275 * all processors.
276 */
277 #define ioremap_cacheable_cow(offset, size) \
278 __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
279 #define ioremap_uncached_accelerated(offset, size) \
280 __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
281
282 static inline void iounmap(volatile void __iomem *addr)
283 {
284 #define __IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
285
286 if (cpu_has_64bit_addresses ||
287 (__builtin_constant_p(addr) && __IS_KSEG1(addr)))
288 return;
289
290 __iounmap(addr);
291
292 #undef __IS_KSEG1
293 }
294
295 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \
296 \
297 static inline void pfx##write##bwlq(type val, \
298 volatile void __iomem *mem) \
299 { \
300 volatile type *__mem; \
301 type __val; \
302 \
303 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
304 \
305 __val = pfx##ioswab##bwlq(__mem, val); \
306 \
307 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
308 *__mem = __val; \
309 else if (cpu_has_64bits) { \
310 unsigned long __flags; \
311 type __tmp; \
312 \
313 if (irq) \
314 local_irq_save(__flags); \
315 __asm__ __volatile__( \
316 ".set mips3" "\t\t# __writeq""\n\t" \
317 "dsll32 %L0, %L0, 0" "\n\t" \
318 "dsrl32 %L0, %L0, 0" "\n\t" \
319 "dsll32 %M0, %M0, 0" "\n\t" \
320 "or %L0, %L0, %M0" "\n\t" \
321 "sd %L0, %2" "\n\t" \
322 ".set mips0" "\n" \
323 : "=r" (__tmp) \
324 : "0" (__val), "m" (*__mem)); \
325 if (irq) \
326 local_irq_restore(__flags); \
327 } else \
328 BUG(); \
329 } \
330 \
331 static inline type pfx##read##bwlq(const volatile void __iomem *mem) \
332 { \
333 volatile type *__mem; \
334 type __val; \
335 \
336 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \
337 \
338 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
339 __val = *__mem; \
340 else if (cpu_has_64bits) { \
341 unsigned long __flags; \
342 \
343 if (irq) \
344 local_irq_save(__flags); \
345 __asm__ __volatile__( \
346 ".set mips3" "\t\t# __readq" "\n\t" \
347 "ld %L0, %1" "\n\t" \
348 "dsra32 %M0, %L0, 0" "\n\t" \
349 "sll %L0, %L0, 0" "\n\t" \
350 ".set mips0" "\n" \
351 : "=r" (__val) \
352 : "m" (*__mem)); \
353 if (irq) \
354 local_irq_restore(__flags); \
355 } else { \
356 __val = 0; \
357 BUG(); \
358 } \
359 \
360 return pfx##ioswab##bwlq(__mem, __val); \
361 }
362
363 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow) \
364 \
365 static inline void pfx##out##bwlq##p(type val, unsigned long port) \
366 { \
367 volatile type *__addr; \
368 type __val; \
369 \
370 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
371 \
372 __val = pfx##ioswab##bwlq(__addr, val); \
373 \
374 /* Really, we want this to be atomic */ \
375 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
376 \
377 *__addr = __val; \
378 slow; \
379 } \
380 \
381 static inline type pfx##in##bwlq##p(unsigned long port) \
382 { \
383 volatile type *__addr; \
384 type __val; \
385 \
386 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
387 \
388 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \
389 \
390 __val = *__addr; \
391 slow; \
392 \
393 return pfx##ioswab##bwlq(__addr, __val); \
394 }
395
396 #define __BUILD_MEMORY_PFX(bus, bwlq, type) \
397 \
398 __BUILD_MEMORY_SINGLE(bus, bwlq, type, 1)
399
400 #define BUILDIO_MEM(bwlq, type) \
401 \
402 __BUILD_MEMORY_PFX(__raw_, bwlq, type) \
403 __BUILD_MEMORY_PFX(, bwlq, type) \
404 __BUILD_MEMORY_PFX(__mem_, bwlq, type) \
405
406 BUILDIO_MEM(b, u8)
407 BUILDIO_MEM(w, u16)
408 BUILDIO_MEM(l, u32)
409 BUILDIO_MEM(q, u64)
410
411 #define __BUILD_IOPORT_PFX(bus, bwlq, type) \
412 __BUILD_IOPORT_SINGLE(bus, bwlq, type, ,) \
413 __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
414
415 #define BUILDIO_IOPORT(bwlq, type) \
416 __BUILD_IOPORT_PFX(, bwlq, type) \
417 __BUILD_IOPORT_PFX(__mem_, bwlq, type)
418
419 BUILDIO_IOPORT(b, u8)
420 BUILDIO_IOPORT(w, u16)
421 BUILDIO_IOPORT(l, u32)
422 #ifdef CONFIG_64BIT
423 BUILDIO_IOPORT(q, u64)
424 #endif
425
426 #define __BUILDIO(bwlq, type) \
427 \
428 __BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0)
429
430 __BUILDIO(q, u64)
431
432 #define readb_relaxed readb
433 #define readw_relaxed readw
434 #define readl_relaxed readl
435 #define readq_relaxed readq
436
437 /*
438 * Some code tests for these symbols
439 */
440 #define readq readq
441 #define writeq writeq
442
443 #define __BUILD_MEMORY_STRING(bwlq, type) \
444 \
445 static inline void writes##bwlq(volatile void __iomem *mem, \
446 const void *addr, unsigned int count) \
447 { \
448 const volatile type *__addr = addr; \
449 \
450 while (count--) { \
451 __mem_write##bwlq(*__addr, mem); \
452 __addr++; \
453 } \
454 } \
455 \
456 static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \
457 unsigned int count) \
458 { \
459 volatile type *__addr = addr; \
460 \
461 while (count--) { \
462 *__addr = __mem_read##bwlq(mem); \
463 __addr++; \
464 } \
465 }
466
467 #define __BUILD_IOPORT_STRING(bwlq, type) \
468 \
469 static inline void outs##bwlq(unsigned long port, const void *addr, \
470 unsigned int count) \
471 { \
472 const volatile type *__addr = addr; \
473 \
474 while (count--) { \
475 __mem_out##bwlq(*__addr, port); \
476 __addr++; \
477 } \
478 } \
479 \
480 static inline void ins##bwlq(unsigned long port, void *addr, \
481 unsigned int count) \
482 { \
483 volatile type *__addr = addr; \
484 \
485 while (count--) { \
486 *__addr = __mem_in##bwlq(port); \
487 __addr++; \
488 } \
489 }
490
491 #define BUILDSTRING(bwlq, type) \
492 \
493 __BUILD_MEMORY_STRING(bwlq, type) \
494 __BUILD_IOPORT_STRING(bwlq, type)
495
496 BUILDSTRING(b, u8)
497 BUILDSTRING(w, u16)
498 BUILDSTRING(l, u32)
499 #ifdef CONFIG_64BIT
500 BUILDSTRING(q, u64)
501 #endif
502
503
504 /* Depends on MIPS II instruction set */
505 #define mmiowb() asm volatile ("sync" ::: "memory")
506
507 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
508 {
509 memset((void __force *) addr, val, count);
510 }
511 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
512 {
513 memcpy(dst, (void __force *) src, count);
514 }
515 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
516 {
517 memcpy((void __force *) dst, src, count);
518 }
519
520 /*
521 * Memory Mapped I/O
522 */
523 #define ioread8(addr) readb(addr)
524 #define ioread16(addr) readw(addr)
525 #define ioread32(addr) readl(addr)
526
527 #define iowrite8(b,addr) writeb(b,addr)
528 #define iowrite16(w,addr) writew(w,addr)
529 #define iowrite32(l,addr) writel(l,addr)
530
531 #define ioread8_rep(a,b,c) readsb(a,b,c)
532 #define ioread16_rep(a,b,c) readsw(a,b,c)
533 #define ioread32_rep(a,b,c) readsl(a,b,c)
534
535 #define iowrite8_rep(a,b,c) writesb(a,b,c)
536 #define iowrite16_rep(a,b,c) writesw(a,b,c)
537 #define iowrite32_rep(a,b,c) writesl(a,b,c)
538
539 /* Create a virtual mapping cookie for an IO port range */
540 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
541 extern void ioport_unmap(void __iomem *);
542
543 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
544 struct pci_dev;
545 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
546 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
547
548 /*
549 * ISA space is 'always mapped' on currently supported MIPS systems, no need
550 * to explicitly ioremap() it. The fact that the ISA IO space is mapped
551 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
552 * are physical addresses. The following constant pointer can be
553 * used as the IO-area pointer (it can be iounmapped as well, so the
554 * analogy with PCI is quite large):
555 */
556 #define __ISA_IO_base ((char *)(isa_slot_offset))
557
558 /*
559 * We don't have csum_partial_copy_fromio() yet, so we cheat here and
560 * just copy it. The net code will then do the checksum later.
561 */
562 #define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len))
563
564 /*
565 * check_signature - find BIOS signatures
566 * @io_addr: mmio address to check
567 * @signature: signature block
568 * @length: length of signature
569 *
570 * Perform a signature comparison with the mmio address io_addr. This
571 * address should have been obtained by ioremap.
572 * Returns 1 on a match.
573 */
574 static inline int check_signature(char __iomem *io_addr,
575 const unsigned char *signature, int length)
576 {
577 int retval = 0;
578 do {
579 if (readb(io_addr) != *signature)
580 goto out;
581 io_addr++;
582 signature++;
583 length--;
584 } while (length);
585 retval = 1;
586 out:
587 return retval;
588 }
589
590 /*
591 * The caches on some architectures aren't dma-coherent and have need to
592 * handle this in software. There are three types of operations that
593 * can be applied to dma buffers.
594 *
595 * - dma_cache_wback_inv(start, size) makes caches and coherent by
596 * writing the content of the caches back to memory, if necessary.
597 * The function also invalidates the affected part of the caches as
598 * necessary before DMA transfers from outside to memory.
599 * - dma_cache_wback(start, size) makes caches and coherent by
600 * writing the content of the caches back to memory, if necessary.
601 * The function also invalidates the affected part of the caches as
602 * necessary before DMA transfers from outside to memory.
603 * - dma_cache_inv(start, size) invalidates the affected parts of the
604 * caches. Dirty lines of the caches may be written back or simply
605 * be discarded. This operation is necessary before dma operations
606 * to the memory.
607 */
608 #ifdef CONFIG_DMA_NONCOHERENT
609
610 extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
611 extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
612 extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
613
614 #define dma_cache_wback_inv(start, size) _dma_cache_wback_inv(start,size)
615 #define dma_cache_wback(start, size) _dma_cache_wback(start,size)
616 #define dma_cache_inv(start, size) _dma_cache_inv(start,size)
617
618 #else /* Sane hardware */
619
620 #define dma_cache_wback_inv(start,size) \
621 do { (void) (start); (void) (size); } while (0)
622 #define dma_cache_wback(start,size) \
623 do { (void) (start); (void) (size); } while (0)
624 #define dma_cache_inv(start,size) \
625 do { (void) (start); (void) (size); } while (0)
626
627 #endif /* CONFIG_DMA_NONCOHERENT */
628
629 /*
630 * Read a 32-bit register that requires a 64-bit read cycle on the bus.
631 * Avoid interrupt mucking, just adjust the address for 4-byte access.
632 * Assume the addresses are 8-byte aligned.
633 */
634 #ifdef __MIPSEB__
635 #define __CSR_32_ADJUST 4
636 #else
637 #define __CSR_32_ADJUST 0
638 #endif
639
640 #define csr_out32(v,a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
641 #define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
642
643 /*
644 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
645 * access
646 */
647 #define xlate_dev_mem_ptr(p) __va(p)
648
649 /*
650 * Convert a virtual cached pointer to an uncached pointer
651 */
652 #define xlate_dev_kmem_ptr(p) p
653
654 #endif /* _ASM_IO_H */
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