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1da177e4 LT |
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 | |
966f4406 | 7 | * Copyright (C) 1994 - 2000, 06 Ralf Baechle |
1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <linux/compiler.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/types.h> | |
18 | ||
19 | #include <asm/addrspace.h> | |
1da177e4 LT |
20 | #include <asm/byteorder.h> |
21 | #include <asm/cpu.h> | |
22 | #include <asm/cpu-features.h> | |
140c1729 | 23 | #include <asm-generic/iomap.h> |
1da177e4 LT |
24 | #include <asm/page.h> |
25 | #include <asm/pgtable-bits.h> | |
26 | #include <asm/processor.h> | |
fe00f943 | 27 | #include <asm/string.h> |
1da177e4 | 28 | |
c3455b0e | 29 | #include <ioremap.h> |
1da177e4 LT |
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 | /* | |
4912ba72 | 38 | * Raw operations are never swapped in software. OTOH values that raw |
1da177e4 LT |
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 | */ | |
21a151d8 RB |
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) | |
1da177e4 | 48 | |
a8433137 | 49 | /* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */ |
1da177e4 | 50 | |
1da177e4 LT |
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 | ||
966f4406 RB |
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 | } | |
1da177e4 LT |
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 | */ | |
99e3b942 | 117 | static inline unsigned long virt_to_phys(volatile const void *address) |
1da177e4 | 118 | { |
6f284a2c | 119 | return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET; |
1da177e4 LT |
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 | { | |
6f284a2c | 136 | return (void *)(address + PAGE_OFFSET - PHYS_OFFSET); |
1da177e4 LT |
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 | ||
0f04afb5 | 175 | extern void __iomem * __ioremap(phys_t offset, phys_t size, unsigned long flags); |
d89e36d8 | 176 | extern void __iounmap(const volatile void __iomem *addr); |
1da177e4 | 177 | |
0f04afb5 | 178 | static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size, |
1da177e4 LT |
179 | unsigned long flags) |
180 | { | |
5ddcb3c3 AN |
181 | void __iomem *addr = plat_ioremap(offset, size, flags); |
182 | ||
183 | if (addr) | |
184 | return addr; | |
185 | ||
c3455b0e MR |
186 | #define __IS_LOW512(addr) (!((phys_t)(addr) & (phys_t) ~0x1fffffffULL)) |
187 | ||
1da177e4 LT |
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; | |
fe00f943 | 197 | return (void __iomem *) (unsigned long) (base + offset); |
c3455b0e MR |
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) | |
c0cf5001 AN |
215 | return (void __iomem *) |
216 | (unsigned long)CKSEG1ADDR(phys_addr); | |
1da177e4 LT |
217 | } |
218 | ||
219 | return __ioremap(offset, size, flags); | |
c3455b0e MR |
220 | |
221 | #undef __IS_LOW512 | |
1da177e4 LT |
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 | ||
778e2ac5 RB |
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 | ||
1da177e4 LT |
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 | ||
d89e36d8 | 289 | static inline void iounmap(const volatile void __iomem *addr) |
1da177e4 | 290 | { |
5ddcb3c3 AN |
291 | if (plat_iounmap(addr)) |
292 | return; | |
293 | ||
c3455b0e MR |
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))) | |
1da177e4 LT |
298 | return; |
299 | ||
300 | __iounmap(addr); | |
1da177e4 | 301 | |
c3455b0e MR |
302 | #undef __IS_KSEG1 |
303 | } | |
1da177e4 LT |
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 | \ | |
a8433137 | 315 | __val = pfx##ioswab##bwlq(__mem, val); \ |
1da177e4 LT |
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 | \ | |
b887d3f2 | 341 | static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ |
1da177e4 LT |
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 | \ | |
049b13c3 TS |
353 | if (irq) \ |
354 | local_irq_save(__flags); \ | |
1da177e4 LT |
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)); \ | |
049b13c3 TS |
363 | if (irq) \ |
364 | local_irq_restore(__flags); \ | |
1da177e4 LT |
365 | } else { \ |
366 | __val = 0; \ | |
367 | BUG(); \ | |
368 | } \ | |
369 | \ | |
a8433137 | 370 | return pfx##ioswab##bwlq(__mem, __val); \ |
1da177e4 LT |
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 | \ | |
a8433137 | 380 | __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \ |
1da177e4 | 381 | \ |
a8433137 | 382 | __val = pfx##ioswab##bwlq(__addr, val); \ |
1da177e4 | 383 | \ |
9d58f302 RB |
384 | /* Really, we want this to be atomic */ \ |
385 | BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ | |
386 | \ | |
387 | *__addr = __val; \ | |
388 | slow; \ | |
1da177e4 LT |
389 | } \ |
390 | \ | |
391 | static inline type pfx##in##bwlq##p(unsigned long port) \ | |
392 | { \ | |
393 | volatile type *__addr; \ | |
394 | type __val; \ | |
395 | \ | |
a8433137 | 396 | __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \ |
1da177e4 | 397 | \ |
9d58f302 RB |
398 | BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ |
399 | \ | |
400 | __val = *__addr; \ | |
401 | slow; \ | |
1da177e4 | 402 | \ |
a8433137 | 403 | return pfx##ioswab##bwlq(__addr, __val); \ |
1da177e4 LT |
404 | } |
405 | ||
406 | #define __BUILD_MEMORY_PFX(bus, bwlq, type) \ | |
407 | \ | |
408 | __BUILD_MEMORY_SINGLE(bus, bwlq, type, 1) | |
409 | ||
9d58f302 | 410 | #define BUILDIO_MEM(bwlq, type) \ |
1da177e4 | 411 | \ |
1da177e4 | 412 | __BUILD_MEMORY_PFX(__raw_, bwlq, type) \ |
4912ba72 | 413 | __BUILD_MEMORY_PFX(, bwlq, type) \ |
290f10ae | 414 | __BUILD_MEMORY_PFX(__mem_, bwlq, type) \ |
9d58f302 RB |
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) \ | |
290f10ae | 427 | __BUILD_IOPORT_PFX(__mem_, bwlq, type) |
9d58f302 RB |
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 | |
1da177e4 LT |
435 | |
436 | #define __BUILDIO(bwlq, type) \ | |
437 | \ | |
4912ba72 | 438 | __BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0) |
1da177e4 | 439 | |
1da177e4 LT |
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 | \ | |
99289a4e AG |
455 | static inline void writes##bwlq(volatile void __iomem *mem, \ |
456 | const void *addr, unsigned int count) \ | |
1da177e4 | 457 | { \ |
99289a4e | 458 | const volatile type *__addr = addr; \ |
1da177e4 LT |
459 | \ |
460 | while (count--) { \ | |
290f10ae | 461 | __mem_write##bwlq(*__addr, mem); \ |
1da177e4 LT |
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--) { \ | |
290f10ae | 472 | *__addr = __mem_read##bwlq(mem); \ |
1da177e4 LT |
473 | __addr++; \ |
474 | } \ | |
475 | } | |
476 | ||
477 | #define __BUILD_IOPORT_STRING(bwlq, type) \ | |
478 | \ | |
ecba36da | 479 | static inline void outs##bwlq(unsigned long port, const void *addr, \ |
1da177e4 LT |
480 | unsigned int count) \ |
481 | { \ | |
ecba36da | 482 | const volatile type *__addr = addr; \ |
1da177e4 LT |
483 | \ |
484 | while (count--) { \ | |
290f10ae | 485 | __mem_out##bwlq(*__addr, port); \ |
1da177e4 LT |
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--) { \ | |
290f10ae | 496 | *__addr = __mem_in##bwlq(port); \ |
1da177e4 LT |
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) | |
9d58f302 | 509 | #ifdef CONFIG_64BIT |
1da177e4 | 510 | BUILDSTRING(q, u64) |
9d58f302 | 511 | #endif |
1da177e4 LT |
512 | |
513 | ||
514 | /* Depends on MIPS II instruction set */ | |
515 | #define mmiowb() asm volatile ("sync" ::: "memory") | |
516 | ||
fe00f943 RB |
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 | } | |
1da177e4 | 529 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | #ifdef CONFIG_DMA_NONCOHERENT | |
559 | ||
560 | extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size); | |
561 | extern void (*_dma_cache_wback)(unsigned long start, unsigned long size); | |
562 | extern void (*_dma_cache_inv)(unsigned long start, unsigned long size); | |
563 | ||
21a151d8 RB |
564 | #define dma_cache_wback_inv(start, size) _dma_cache_wback_inv(start, size) |
565 | #define dma_cache_wback(start, size) _dma_cache_wback(start, size) | |
566 | #define dma_cache_inv(start, size) _dma_cache_inv(start, size) | |
1da177e4 LT |
567 | |
568 | #else /* Sane hardware */ | |
569 | ||
570 | #define dma_cache_wback_inv(start,size) \ | |
571 | do { (void) (start); (void) (size); } while (0) | |
572 | #define dma_cache_wback(start,size) \ | |
573 | do { (void) (start); (void) (size); } while (0) | |
574 | #define dma_cache_inv(start,size) \ | |
575 | do { (void) (start); (void) (size); } while (0) | |
576 | ||
577 | #endif /* CONFIG_DMA_NONCOHERENT */ | |
578 | ||
579 | /* | |
580 | * Read a 32-bit register that requires a 64-bit read cycle on the bus. | |
581 | * Avoid interrupt mucking, just adjust the address for 4-byte access. | |
582 | * Assume the addresses are 8-byte aligned. | |
583 | */ | |
584 | #ifdef __MIPSEB__ | |
585 | #define __CSR_32_ADJUST 4 | |
586 | #else | |
587 | #define __CSR_32_ADJUST 0 | |
588 | #endif | |
589 | ||
21a151d8 | 590 | #define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v)) |
1da177e4 LT |
591 | #define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST)) |
592 | ||
593 | /* | |
594 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
595 | * access | |
596 | */ | |
597 | #define xlate_dev_mem_ptr(p) __va(p) | |
598 | ||
599 | /* | |
600 | * Convert a virtual cached pointer to an uncached pointer | |
601 | */ | |
602 | #define xlate_dev_kmem_ptr(p) p | |
603 | ||
604 | #endif /* _ASM_IO_H */ |