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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * arch/parisc/lib/io.c | |
4 | * | |
5 | * Copyright (c) Matthew Wilcox 2001 for Hewlett-Packard | |
6 | * Copyright (c) Randolph Chung 2001 <tausq@debian.org> | |
7 | * | |
8 | * IO accessing functions which shouldn't be inlined because they're too big | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <asm/io.h> | |
14 | ||
15 | /* Copies a block of memory to a device in an efficient manner. | |
16 | * Assumes the device can cope with 32-bit transfers. If it can't, | |
17 | * don't use this function. | |
18 | */ | |
19 | void memcpy_toio(volatile void __iomem *dst, const void *src, int count) | |
20 | { | |
21 | if (((unsigned long)dst & 3) != ((unsigned long)src & 3)) | |
22 | goto bytecopy; | |
23 | while ((unsigned long)dst & 3) { | |
24 | writeb(*(char *)src, dst++); | |
25 | src++; | |
26 | count--; | |
27 | } | |
28 | while (count > 3) { | |
29 | __raw_writel(*(u32 *)src, dst); | |
30 | src += 4; | |
31 | dst += 4; | |
32 | count -= 4; | |
33 | } | |
34 | bytecopy: | |
35 | while (count--) { | |
36 | writeb(*(char *)src, dst++); | |
37 | src++; | |
38 | } | |
39 | } | |
40 | ||
41 | /* | |
42 | ** Copies a block of memory from a device in an efficient manner. | |
43 | ** Assumes the device can cope with 32-bit transfers. If it can't, | |
44 | ** don't use this function. | |
45 | ** | |
46 | ** CR16 counts on C3000 reading 256 bytes from Symbios 896 RAM: | |
47 | ** 27341/64 = 427 cyc per int | |
48 | ** 61311/128 = 478 cyc per short | |
49 | ** 122637/256 = 479 cyc per byte | |
50 | ** Ergo bus latencies dominant (not transfer size). | |
51 | ** Minimize total number of transfers at cost of CPU cycles. | |
52 | ** TODO: only look at src alignment and adjust the stores to dest. | |
53 | */ | |
54 | void memcpy_fromio(void *dst, const volatile void __iomem *src, int count) | |
55 | { | |
56 | /* first compare alignment of src/dst */ | |
57 | if ( (((unsigned long)dst ^ (unsigned long)src) & 1) || (count < 2) ) | |
58 | goto bytecopy; | |
59 | ||
60 | if ( (((unsigned long)dst ^ (unsigned long)src) & 2) || (count < 4) ) | |
61 | goto shortcopy; | |
62 | ||
63 | /* Then check for misaligned start address */ | |
64 | if ((unsigned long)src & 1) { | |
65 | *(u8 *)dst = readb(src); | |
66 | src++; | |
67 | dst++; | |
68 | count--; | |
69 | if (count < 2) goto bytecopy; | |
70 | } | |
71 | ||
72 | if ((unsigned long)src & 2) { | |
73 | *(u16 *)dst = __raw_readw(src); | |
74 | src += 2; | |
75 | dst += 2; | |
76 | count -= 2; | |
77 | } | |
78 | ||
79 | while (count > 3) { | |
80 | *(u32 *)dst = __raw_readl(src); | |
81 | dst += 4; | |
82 | src += 4; | |
83 | count -= 4; | |
84 | } | |
85 | ||
86 | shortcopy: | |
87 | while (count > 1) { | |
88 | *(u16 *)dst = __raw_readw(src); | |
89 | src += 2; | |
90 | dst += 2; | |
91 | count -= 2; | |
92 | } | |
93 | ||
94 | bytecopy: | |
95 | while (count--) { | |
96 | *(char *)dst = readb(src); | |
97 | src++; | |
98 | dst++; | |
99 | } | |
100 | } | |
101 | ||
102 | /* Sets a block of memory on a device to a given value. | |
103 | * Assumes the device can cope with 32-bit transfers. If it can't, | |
104 | * don't use this function. | |
105 | */ | |
106 | void memset_io(volatile void __iomem *addr, unsigned char val, int count) | |
107 | { | |
108 | u32 val32 = (val << 24) | (val << 16) | (val << 8) | val; | |
109 | while ((unsigned long)addr & 3) { | |
110 | writeb(val, addr++); | |
111 | count--; | |
112 | } | |
113 | while (count > 3) { | |
114 | __raw_writel(val32, addr); | |
115 | addr += 4; | |
116 | count -= 4; | |
117 | } | |
118 | while (count--) { | |
119 | writeb(val, addr++); | |
120 | } | |
121 | } | |
122 | ||
123 | /* | |
124 | * Read COUNT 8-bit bytes from port PORT into memory starting at | |
125 | * SRC. | |
126 | */ | |
127 | void insb (unsigned long port, void *dst, unsigned long count) | |
128 | { | |
129 | unsigned char *p; | |
130 | ||
131 | p = (unsigned char *)dst; | |
132 | ||
133 | while (((unsigned long)p) & 0x3) { | |
134 | if (!count) | |
135 | return; | |
136 | count--; | |
137 | *p = inb(port); | |
138 | p++; | |
139 | } | |
140 | ||
141 | while (count >= 4) { | |
142 | unsigned int w; | |
143 | count -= 4; | |
144 | w = inb(port) << 24; | |
145 | w |= inb(port) << 16; | |
146 | w |= inb(port) << 8; | |
147 | w |= inb(port); | |
148 | *(unsigned int *) p = w; | |
149 | p += 4; | |
150 | } | |
151 | ||
152 | while (count) { | |
153 | --count; | |
154 | *p = inb(port); | |
155 | p++; | |
156 | } | |
157 | } | |
158 | ||
159 | ||
160 | /* | |
161 | * Read COUNT 16-bit words from port PORT into memory starting at | |
162 | * SRC. SRC must be at least short aligned. This is used by the | |
163 | * IDE driver to read disk sectors. Performance is important, but | |
164 | * the interfaces seems to be slow: just using the inlined version | |
165 | * of the inw() breaks things. | |
166 | */ | |
167 | void insw (unsigned long port, void *dst, unsigned long count) | |
168 | { | |
169 | unsigned int l = 0, l2; | |
170 | unsigned char *p; | |
171 | ||
172 | p = (unsigned char *)dst; | |
173 | ||
174 | if (!count) | |
175 | return; | |
176 | ||
177 | switch (((unsigned long)p) & 0x3) | |
178 | { | |
179 | case 0x00: /* Buffer 32-bit aligned */ | |
180 | while (count>=2) { | |
181 | ||
182 | count -= 2; | |
183 | l = cpu_to_le16(inw(port)) << 16; | |
184 | l |= cpu_to_le16(inw(port)); | |
185 | *(unsigned int *)p = l; | |
186 | p += 4; | |
187 | } | |
188 | if (count) { | |
189 | *(unsigned short *)p = cpu_to_le16(inw(port)); | |
190 | } | |
191 | break; | |
192 | ||
193 | case 0x02: /* Buffer 16-bit aligned */ | |
194 | *(unsigned short *)p = cpu_to_le16(inw(port)); | |
195 | p += 2; | |
196 | count--; | |
197 | while (count>=2) { | |
198 | ||
199 | count -= 2; | |
200 | l = cpu_to_le16(inw(port)) << 16; | |
201 | l |= cpu_to_le16(inw(port)); | |
202 | *(unsigned int *)p = l; | |
203 | p += 4; | |
204 | } | |
205 | if (count) { | |
206 | *(unsigned short *)p = cpu_to_le16(inw(port)); | |
207 | } | |
208 | break; | |
209 | ||
210 | case 0x01: /* Buffer 8-bit aligned */ | |
211 | case 0x03: | |
212 | /* I don't bother with 32bit transfers | |
213 | * in this case, 16bit will have to do -- DE */ | |
214 | --count; | |
215 | ||
216 | l = cpu_to_le16(inw(port)); | |
217 | *p = l >> 8; | |
218 | p++; | |
219 | while (count--) | |
220 | { | |
221 | l2 = cpu_to_le16(inw(port)); | |
222 | *(unsigned short *)p = (l & 0xff) << 8 | (l2 >> 8); | |
223 | p += 2; | |
224 | l = l2; | |
225 | } | |
226 | *p = l & 0xff; | |
227 | break; | |
228 | } | |
229 | } | |
230 | ||
231 | ||
232 | ||
233 | /* | |
234 | * Read COUNT 32-bit words from port PORT into memory starting at | |
235 | * SRC. Now works with any alignment in SRC. Performance is important, | |
236 | * but the interfaces seems to be slow: just using the inlined version | |
237 | * of the inl() breaks things. | |
238 | */ | |
239 | void insl (unsigned long port, void *dst, unsigned long count) | |
240 | { | |
241 | unsigned int l = 0, l2; | |
242 | unsigned char *p; | |
243 | ||
244 | p = (unsigned char *)dst; | |
245 | ||
246 | if (!count) | |
247 | return; | |
248 | ||
249 | switch (((unsigned long) dst) & 0x3) | |
250 | { | |
251 | case 0x00: /* Buffer 32-bit aligned */ | |
252 | while (count--) | |
253 | { | |
254 | *(unsigned int *)p = cpu_to_le32(inl(port)); | |
255 | p += 4; | |
256 | } | |
257 | break; | |
258 | ||
259 | case 0x02: /* Buffer 16-bit aligned */ | |
260 | --count; | |
261 | ||
262 | l = cpu_to_le32(inl(port)); | |
263 | *(unsigned short *)p = l >> 16; | |
264 | p += 2; | |
265 | ||
266 | while (count--) | |
267 | { | |
268 | l2 = cpu_to_le32(inl(port)); | |
269 | *(unsigned int *)p = (l & 0xffff) << 16 | (l2 >> 16); | |
270 | p += 4; | |
271 | l = l2; | |
272 | } | |
273 | *(unsigned short *)p = l & 0xffff; | |
274 | break; | |
275 | case 0x01: /* Buffer 8-bit aligned */ | |
276 | --count; | |
277 | ||
278 | l = cpu_to_le32(inl(port)); | |
279 | *(unsigned char *)p = l >> 24; | |
280 | p++; | |
281 | *(unsigned short *)p = (l >> 8) & 0xffff; | |
282 | p += 2; | |
283 | while (count--) | |
284 | { | |
285 | l2 = cpu_to_le32(inl(port)); | |
286 | *(unsigned int *)p = (l & 0xff) << 24 | (l2 >> 8); | |
287 | p += 4; | |
288 | l = l2; | |
289 | } | |
290 | *p = l & 0xff; | |
291 | break; | |
292 | case 0x03: /* Buffer 8-bit aligned */ | |
293 | --count; | |
294 | ||
295 | l = cpu_to_le32(inl(port)); | |
296 | *p = l >> 24; | |
297 | p++; | |
298 | while (count--) | |
299 | { | |
300 | l2 = cpu_to_le32(inl(port)); | |
301 | *(unsigned int *)p = (l & 0xffffff) << 8 | l2 >> 24; | |
302 | p += 4; | |
303 | l = l2; | |
304 | } | |
305 | *(unsigned short *)p = (l >> 8) & 0xffff; | |
306 | p += 2; | |
307 | *p = l & 0xff; | |
308 | break; | |
309 | } | |
310 | } | |
311 | ||
312 | ||
313 | /* | |
314 | * Like insb but in the opposite direction. | |
315 | * Don't worry as much about doing aligned memory transfers: | |
316 | * doing byte reads the "slow" way isn't nearly as slow as | |
317 | * doing byte writes the slow way (no r-m-w cycle). | |
318 | */ | |
319 | void outsb(unsigned long port, const void * src, unsigned long count) | |
320 | { | |
321 | const unsigned char *p; | |
322 | ||
323 | p = (const unsigned char *)src; | |
324 | while (count) { | |
325 | count--; | |
326 | outb(*p, port); | |
327 | p++; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * Like insw but in the opposite direction. This is used by the IDE | |
333 | * driver to write disk sectors. Performance is important, but the | |
334 | * interfaces seems to be slow: just using the inlined version of the | |
335 | * outw() breaks things. | |
336 | */ | |
337 | void outsw (unsigned long port, const void *src, unsigned long count) | |
338 | { | |
339 | unsigned int l = 0, l2; | |
340 | const unsigned char *p; | |
341 | ||
342 | p = (const unsigned char *)src; | |
343 | ||
344 | if (!count) | |
345 | return; | |
346 | ||
347 | switch (((unsigned long)p) & 0x3) | |
348 | { | |
349 | case 0x00: /* Buffer 32-bit aligned */ | |
350 | while (count>=2) { | |
351 | count -= 2; | |
352 | l = *(unsigned int *)p; | |
353 | p += 4; | |
354 | outw(le16_to_cpu(l >> 16), port); | |
355 | outw(le16_to_cpu(l & 0xffff), port); | |
356 | } | |
357 | if (count) { | |
358 | outw(le16_to_cpu(*(unsigned short*)p), port); | |
359 | } | |
360 | break; | |
361 | ||
362 | case 0x02: /* Buffer 16-bit aligned */ | |
363 | ||
364 | outw(le16_to_cpu(*(unsigned short*)p), port); | |
365 | p += 2; | |
366 | count--; | |
367 | ||
368 | while (count>=2) { | |
369 | count -= 2; | |
370 | l = *(unsigned int *)p; | |
371 | p += 4; | |
372 | outw(le16_to_cpu(l >> 16), port); | |
373 | outw(le16_to_cpu(l & 0xffff), port); | |
374 | } | |
375 | if (count) { | |
376 | outw(le16_to_cpu(*(unsigned short *)p), port); | |
377 | } | |
378 | break; | |
379 | ||
380 | case 0x01: /* Buffer 8-bit aligned */ | |
381 | /* I don't bother with 32bit transfers | |
382 | * in this case, 16bit will have to do -- DE */ | |
383 | ||
384 | l = *p << 8; | |
385 | p++; | |
386 | count--; | |
387 | while (count) | |
388 | { | |
389 | count--; | |
390 | l2 = *(unsigned short *)p; | |
391 | p += 2; | |
392 | outw(le16_to_cpu(l | l2 >> 8), port); | |
393 | l = l2 << 8; | |
394 | } | |
395 | l2 = *(unsigned char *)p; | |
396 | outw (le16_to_cpu(l | l2>>8), port); | |
397 | break; | |
398 | ||
399 | } | |
400 | } | |
401 | ||
402 | ||
403 | /* | |
404 | * Like insl but in the opposite direction. This is used by the IDE | |
405 | * driver to write disk sectors. Works with any alignment in SRC. | |
406 | * Performance is important, but the interfaces seems to be slow: | |
407 | * just using the inlined version of the outl() breaks things. | |
408 | */ | |
409 | void outsl (unsigned long port, const void *src, unsigned long count) | |
410 | { | |
411 | unsigned int l = 0, l2; | |
412 | const unsigned char *p; | |
413 | ||
414 | p = (const unsigned char *)src; | |
415 | ||
416 | if (!count) | |
417 | return; | |
418 | ||
419 | switch (((unsigned long)p) & 0x3) | |
420 | { | |
421 | case 0x00: /* Buffer 32-bit aligned */ | |
422 | while (count--) | |
423 | { | |
424 | outl(le32_to_cpu(*(unsigned int *)p), port); | |
425 | p += 4; | |
426 | } | |
427 | break; | |
428 | ||
429 | case 0x02: /* Buffer 16-bit aligned */ | |
430 | --count; | |
431 | ||
432 | l = *(unsigned short *)p; | |
433 | p += 2; | |
434 | ||
435 | while (count--) | |
436 | { | |
437 | l2 = *(unsigned int *)p; | |
438 | p += 4; | |
439 | outl (le32_to_cpu(l << 16 | l2 >> 16), port); | |
440 | l = l2; | |
441 | } | |
442 | l2 = *(unsigned short *)p; | |
443 | outl (le32_to_cpu(l << 16 | l2), port); | |
444 | break; | |
445 | case 0x01: /* Buffer 8-bit aligned */ | |
446 | --count; | |
447 | ||
448 | l = *p << 24; | |
449 | p++; | |
450 | l |= *(unsigned short *)p << 8; | |
451 | p += 2; | |
452 | ||
453 | while (count--) | |
454 | { | |
455 | l2 = *(unsigned int *)p; | |
456 | p += 4; | |
457 | outl (le32_to_cpu(l | l2 >> 24), port); | |
458 | l = l2 << 8; | |
459 | } | |
460 | l2 = *p; | |
461 | outl (le32_to_cpu(l | l2), port); | |
462 | break; | |
463 | case 0x03: /* Buffer 8-bit aligned */ | |
464 | --count; | |
465 | ||
466 | l = *p << 24; | |
467 | p++; | |
468 | ||
469 | while (count--) | |
470 | { | |
471 | l2 = *(unsigned int *)p; | |
472 | p += 4; | |
473 | outl (le32_to_cpu(l | l2 >> 8), port); | |
474 | l = l2 << 24; | |
475 | } | |
476 | l2 = *(unsigned short *)p << 16; | |
477 | p += 2; | |
478 | l2 |= *p; | |
479 | outl (le32_to_cpu(l | l2), port); | |
480 | break; | |
481 | } | |
482 | } | |
483 | ||
484 | EXPORT_SYMBOL(insb); | |
485 | EXPORT_SYMBOL(insw); | |
486 | EXPORT_SYMBOL(insl); | |
487 | EXPORT_SYMBOL(outsb); | |
488 | EXPORT_SYMBOL(outsw); | |
489 | EXPORT_SYMBOL(outsl); |