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Commit | Line | Data |
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28644c80 DP |
1 | /* |
2 | * Register cache access API - rbtree caching support | |
3 | * | |
4 | * Copyright 2011 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
bad2ab4b | 13 | #include <linux/debugfs.h> |
e39be3a3 | 14 | #include <linux/device.h> |
28644c80 | 15 | #include <linux/rbtree.h> |
bad2ab4b | 16 | #include <linux/seq_file.h> |
e39be3a3 | 17 | #include <linux/slab.h> |
28644c80 DP |
18 | |
19 | #include "internal.h" | |
20 | ||
21 | static int regcache_rbtree_write(struct regmap *map, unsigned int reg, | |
22 | unsigned int value); | |
462a185c | 23 | static int regcache_rbtree_exit(struct regmap *map); |
28644c80 DP |
24 | |
25 | struct regcache_rbtree_node { | |
28644c80 DP |
26 | /* block of adjacent registers */ |
27 | void *block; | |
3f4ff561 LPC |
28 | /* Which registers are present */ |
29 | long *cache_present; | |
70d383b7 JCP |
30 | /* base register handled by this block */ |
31 | unsigned int base_reg; | |
28644c80 DP |
32 | /* number of registers available in the block */ |
33 | unsigned int blklen; | |
70d383b7 JCP |
34 | /* the actual rbtree node holding this block */ |
35 | struct rb_node node; | |
28644c80 DP |
36 | } __attribute__ ((packed)); |
37 | ||
38 | struct regcache_rbtree_ctx { | |
39 | struct rb_root root; | |
40 | struct regcache_rbtree_node *cached_rbnode; | |
41 | }; | |
42 | ||
43 | static inline void regcache_rbtree_get_base_top_reg( | |
f01ee60f | 44 | struct regmap *map, |
28644c80 DP |
45 | struct regcache_rbtree_node *rbnode, |
46 | unsigned int *base, unsigned int *top) | |
47 | { | |
48 | *base = rbnode->base_reg; | |
f01ee60f | 49 | *top = rbnode->base_reg + ((rbnode->blklen - 1) * map->reg_stride); |
28644c80 DP |
50 | } |
51 | ||
879082c9 MB |
52 | static unsigned int regcache_rbtree_get_register(struct regmap *map, |
53 | struct regcache_rbtree_node *rbnode, unsigned int idx) | |
28644c80 | 54 | { |
879082c9 | 55 | return regcache_get_val(map, rbnode->block, idx); |
28644c80 DP |
56 | } |
57 | ||
879082c9 MB |
58 | static void regcache_rbtree_set_register(struct regmap *map, |
59 | struct regcache_rbtree_node *rbnode, | |
60 | unsigned int idx, unsigned int val) | |
28644c80 | 61 | { |
3f4ff561 | 62 | set_bit(idx, rbnode->cache_present); |
879082c9 | 63 | regcache_set_val(map, rbnode->block, idx, val); |
28644c80 DP |
64 | } |
65 | ||
3405addd | 66 | static struct regcache_rbtree_node *regcache_rbtree_lookup(struct regmap *map, |
879082c9 | 67 | unsigned int reg) |
28644c80 | 68 | { |
3405addd | 69 | struct regcache_rbtree_ctx *rbtree_ctx = map->cache; |
28644c80 DP |
70 | struct rb_node *node; |
71 | struct regcache_rbtree_node *rbnode; | |
72 | unsigned int base_reg, top_reg; | |
73 | ||
3405addd LPC |
74 | rbnode = rbtree_ctx->cached_rbnode; |
75 | if (rbnode) { | |
f01ee60f SW |
76 | regcache_rbtree_get_base_top_reg(map, rbnode, &base_reg, |
77 | &top_reg); | |
3405addd LPC |
78 | if (reg >= base_reg && reg <= top_reg) |
79 | return rbnode; | |
80 | } | |
81 | ||
82 | node = rbtree_ctx->root.rb_node; | |
28644c80 DP |
83 | while (node) { |
84 | rbnode = container_of(node, struct regcache_rbtree_node, node); | |
f01ee60f SW |
85 | regcache_rbtree_get_base_top_reg(map, rbnode, &base_reg, |
86 | &top_reg); | |
3405addd LPC |
87 | if (reg >= base_reg && reg <= top_reg) { |
88 | rbtree_ctx->cached_rbnode = rbnode; | |
28644c80 | 89 | return rbnode; |
3405addd | 90 | } else if (reg > top_reg) { |
28644c80 | 91 | node = node->rb_right; |
3405addd | 92 | } else if (reg < base_reg) { |
28644c80 | 93 | node = node->rb_left; |
3405addd | 94 | } |
28644c80 DP |
95 | } |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
f01ee60f | 100 | static int regcache_rbtree_insert(struct regmap *map, struct rb_root *root, |
28644c80 DP |
101 | struct regcache_rbtree_node *rbnode) |
102 | { | |
103 | struct rb_node **new, *parent; | |
104 | struct regcache_rbtree_node *rbnode_tmp; | |
105 | unsigned int base_reg_tmp, top_reg_tmp; | |
106 | unsigned int base_reg; | |
107 | ||
108 | parent = NULL; | |
109 | new = &root->rb_node; | |
110 | while (*new) { | |
111 | rbnode_tmp = container_of(*new, struct regcache_rbtree_node, | |
112 | node); | |
113 | /* base and top registers of the current rbnode */ | |
f01ee60f | 114 | regcache_rbtree_get_base_top_reg(map, rbnode_tmp, &base_reg_tmp, |
28644c80 DP |
115 | &top_reg_tmp); |
116 | /* base register of the rbnode to be added */ | |
117 | base_reg = rbnode->base_reg; | |
118 | parent = *new; | |
119 | /* if this register has already been inserted, just return */ | |
120 | if (base_reg >= base_reg_tmp && | |
121 | base_reg <= top_reg_tmp) | |
122 | return 0; | |
123 | else if (base_reg > top_reg_tmp) | |
124 | new = &((*new)->rb_right); | |
125 | else if (base_reg < base_reg_tmp) | |
126 | new = &((*new)->rb_left); | |
127 | } | |
128 | ||
129 | /* insert the node into the rbtree */ | |
130 | rb_link_node(&rbnode->node, parent, new); | |
131 | rb_insert_color(&rbnode->node, root); | |
132 | ||
133 | return 1; | |
134 | } | |
135 | ||
bad2ab4b MB |
136 | #ifdef CONFIG_DEBUG_FS |
137 | static int rbtree_show(struct seq_file *s, void *ignored) | |
138 | { | |
139 | struct regmap *map = s->private; | |
140 | struct regcache_rbtree_ctx *rbtree_ctx = map->cache; | |
141 | struct regcache_rbtree_node *n; | |
142 | struct rb_node *node; | |
143 | unsigned int base, top; | |
a42277c7 | 144 | size_t mem_size; |
bad2ab4b MB |
145 | int nodes = 0; |
146 | int registers = 0; | |
f01ee60f | 147 | int this_registers, average; |
bad2ab4b | 148 | |
f20c783c | 149 | map->lock(map->lock_arg); |
bad2ab4b | 150 | |
a42277c7 DP |
151 | mem_size = sizeof(*rbtree_ctx); |
152 | ||
bad2ab4b MB |
153 | for (node = rb_first(&rbtree_ctx->root); node != NULL; |
154 | node = rb_next(node)) { | |
155 | n = container_of(node, struct regcache_rbtree_node, node); | |
a42277c7 DP |
156 | mem_size += sizeof(*n); |
157 | mem_size += (n->blklen * map->cache_word_size); | |
3f4ff561 | 158 | mem_size += BITS_TO_LONGS(n->blklen) * sizeof(long); |
bad2ab4b | 159 | |
f01ee60f SW |
160 | regcache_rbtree_get_base_top_reg(map, n, &base, &top); |
161 | this_registers = ((top - base) / map->reg_stride) + 1; | |
162 | seq_printf(s, "%x-%x (%d)\n", base, top, this_registers); | |
bad2ab4b MB |
163 | |
164 | nodes++; | |
f01ee60f | 165 | registers += this_registers; |
bad2ab4b MB |
166 | } |
167 | ||
c04c1b9e SW |
168 | if (nodes) |
169 | average = registers / nodes; | |
170 | else | |
171 | average = 0; | |
172 | ||
a42277c7 DP |
173 | seq_printf(s, "%d nodes, %d registers, average %d registers, used %zu bytes\n", |
174 | nodes, registers, average, mem_size); | |
bad2ab4b | 175 | |
f20c783c | 176 | map->unlock(map->lock_arg); |
bad2ab4b MB |
177 | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int rbtree_open(struct inode *inode, struct file *file) | |
182 | { | |
183 | return single_open(file, rbtree_show, inode->i_private); | |
184 | } | |
185 | ||
186 | static const struct file_operations rbtree_fops = { | |
187 | .open = rbtree_open, | |
188 | .read = seq_read, | |
189 | .llseek = seq_lseek, | |
190 | .release = single_release, | |
191 | }; | |
cce585ce MB |
192 | |
193 | static void rbtree_debugfs_init(struct regmap *map) | |
194 | { | |
195 | debugfs_create_file("rbtree", 0400, map->debugfs, map, &rbtree_fops); | |
196 | } | |
bad2ab4b MB |
197 | #endif |
198 | ||
28644c80 DP |
199 | static int regcache_rbtree_init(struct regmap *map) |
200 | { | |
201 | struct regcache_rbtree_ctx *rbtree_ctx; | |
202 | int i; | |
203 | int ret; | |
204 | ||
205 | map->cache = kmalloc(sizeof *rbtree_ctx, GFP_KERNEL); | |
206 | if (!map->cache) | |
207 | return -ENOMEM; | |
208 | ||
209 | rbtree_ctx = map->cache; | |
210 | rbtree_ctx->root = RB_ROOT; | |
211 | rbtree_ctx->cached_rbnode = NULL; | |
212 | ||
213 | for (i = 0; i < map->num_reg_defaults; i++) { | |
214 | ret = regcache_rbtree_write(map, | |
215 | map->reg_defaults[i].reg, | |
216 | map->reg_defaults[i].def); | |
217 | if (ret) | |
218 | goto err; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | ||
223 | err: | |
462a185c | 224 | regcache_rbtree_exit(map); |
28644c80 DP |
225 | return ret; |
226 | } | |
227 | ||
228 | static int regcache_rbtree_exit(struct regmap *map) | |
229 | { | |
230 | struct rb_node *next; | |
231 | struct regcache_rbtree_ctx *rbtree_ctx; | |
232 | struct regcache_rbtree_node *rbtree_node; | |
233 | ||
234 | /* if we've already been called then just return */ | |
235 | rbtree_ctx = map->cache; | |
236 | if (!rbtree_ctx) | |
237 | return 0; | |
238 | ||
239 | /* free up the rbtree */ | |
240 | next = rb_first(&rbtree_ctx->root); | |
241 | while (next) { | |
242 | rbtree_node = rb_entry(next, struct regcache_rbtree_node, node); | |
243 | next = rb_next(&rbtree_node->node); | |
244 | rb_erase(&rbtree_node->node, &rbtree_ctx->root); | |
3f4ff561 | 245 | kfree(rbtree_node->cache_present); |
28644c80 DP |
246 | kfree(rbtree_node->block); |
247 | kfree(rbtree_node); | |
248 | } | |
249 | ||
250 | /* release the resources */ | |
251 | kfree(map->cache); | |
252 | map->cache = NULL; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int regcache_rbtree_read(struct regmap *map, | |
258 | unsigned int reg, unsigned int *value) | |
259 | { | |
28644c80 | 260 | struct regcache_rbtree_node *rbnode; |
28644c80 DP |
261 | unsigned int reg_tmp; |
262 | ||
3405addd | 263 | rbnode = regcache_rbtree_lookup(map, reg); |
28644c80 | 264 | if (rbnode) { |
f01ee60f | 265 | reg_tmp = (reg - rbnode->base_reg) / map->reg_stride; |
3f4ff561 | 266 | if (!test_bit(reg_tmp, rbnode->cache_present)) |
0c7ed856 | 267 | return -ENOENT; |
879082c9 | 268 | *value = regcache_rbtree_get_register(map, rbnode, reg_tmp); |
28644c80 | 269 | } else { |
6e6ace00 | 270 | return -ENOENT; |
28644c80 DP |
271 | } |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | ||
879082c9 MB |
277 | static int regcache_rbtree_insert_to_block(struct regmap *map, |
278 | struct regcache_rbtree_node *rbnode, | |
472fdec7 LPC |
279 | unsigned int base_reg, |
280 | unsigned int top_reg, | |
281 | unsigned int reg, | |
879082c9 | 282 | unsigned int value) |
28644c80 | 283 | { |
472fdec7 LPC |
284 | unsigned int blklen; |
285 | unsigned int pos, offset; | |
3f4ff561 | 286 | unsigned long *present; |
28644c80 DP |
287 | u8 *blk; |
288 | ||
472fdec7 LPC |
289 | blklen = (top_reg - base_reg) / map->reg_stride + 1; |
290 | pos = (reg - base_reg) / map->reg_stride; | |
291 | offset = (rbnode->base_reg - base_reg) / map->reg_stride; | |
292 | ||
28644c80 | 293 | blk = krealloc(rbnode->block, |
472fdec7 | 294 | blklen * map->cache_word_size, |
879082c9 | 295 | GFP_KERNEL); |
28644c80 DP |
296 | if (!blk) |
297 | return -ENOMEM; | |
298 | ||
8ef9724b GR |
299 | if (BITS_TO_LONGS(blklen) > BITS_TO_LONGS(rbnode->blklen)) { |
300 | present = krealloc(rbnode->cache_present, | |
301 | BITS_TO_LONGS(blklen) * sizeof(*present), | |
302 | GFP_KERNEL); | |
303 | if (!present) { | |
304 | kfree(blk); | |
305 | return -ENOMEM; | |
306 | } | |
307 | ||
308 | memset(present + BITS_TO_LONGS(rbnode->blklen), 0, | |
309 | (BITS_TO_LONGS(blklen) - BITS_TO_LONGS(rbnode->blklen)) | |
310 | * sizeof(*present)); | |
311 | } else { | |
312 | present = rbnode->cache_present; | |
3f4ff561 LPC |
313 | } |
314 | ||
28644c80 | 315 | /* insert the register value in the correct place in the rbnode block */ |
3f4ff561 | 316 | if (pos == 0) { |
472fdec7 LPC |
317 | memmove(blk + offset * map->cache_word_size, |
318 | blk, rbnode->blklen * map->cache_word_size); | |
328f494d | 319 | bitmap_shift_left(present, present, offset, blklen); |
3f4ff561 | 320 | } |
28644c80 DP |
321 | |
322 | /* update the rbnode block, its size and the base register */ | |
323 | rbnode->block = blk; | |
472fdec7 LPC |
324 | rbnode->blklen = blklen; |
325 | rbnode->base_reg = base_reg; | |
3f4ff561 | 326 | rbnode->cache_present = present; |
28644c80 | 327 | |
879082c9 | 328 | regcache_rbtree_set_register(map, rbnode, pos, value); |
28644c80 DP |
329 | return 0; |
330 | } | |
331 | ||
0186645d MB |
332 | static struct regcache_rbtree_node * |
333 | regcache_rbtree_node_alloc(struct regmap *map, unsigned int reg) | |
334 | { | |
335 | struct regcache_rbtree_node *rbnode; | |
7278af5f MB |
336 | const struct regmap_range *range; |
337 | int i; | |
0186645d MB |
338 | |
339 | rbnode = kzalloc(sizeof(*rbnode), GFP_KERNEL); | |
340 | if (!rbnode) | |
341 | return NULL; | |
342 | ||
7278af5f MB |
343 | /* If there is a read table then use it to guess at an allocation */ |
344 | if (map->rd_table) { | |
345 | for (i = 0; i < map->rd_table->n_yes_ranges; i++) { | |
346 | if (regmap_reg_in_range(reg, | |
347 | &map->rd_table->yes_ranges[i])) | |
348 | break; | |
349 | } | |
350 | ||
351 | if (i != map->rd_table->n_yes_ranges) { | |
352 | range = &map->rd_table->yes_ranges[i]; | |
b6752123 LPC |
353 | rbnode->blklen = (range->range_max - range->range_min) / |
354 | map->reg_stride + 1; | |
7278af5f MB |
355 | rbnode->base_reg = range->range_min; |
356 | } | |
357 | } | |
358 | ||
359 | if (!rbnode->blklen) { | |
4e67fb5f | 360 | rbnode->blklen = 1; |
7278af5f MB |
361 | rbnode->base_reg = reg; |
362 | } | |
363 | ||
0186645d MB |
364 | rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size, |
365 | GFP_KERNEL); | |
3f4ff561 LPC |
366 | if (!rbnode->block) |
367 | goto err_free; | |
368 | ||
eeda1bd6 | 369 | rbnode->cache_present = kcalloc(BITS_TO_LONGS(rbnode->blklen), |
370 | sizeof(*rbnode->cache_present), | |
371 | GFP_KERNEL); | |
3f4ff561 LPC |
372 | if (!rbnode->cache_present) |
373 | goto err_free_block; | |
0186645d MB |
374 | |
375 | return rbnode; | |
3f4ff561 LPC |
376 | |
377 | err_free_block: | |
378 | kfree(rbnode->block); | |
379 | err_free: | |
380 | kfree(rbnode); | |
381 | return NULL; | |
0186645d MB |
382 | } |
383 | ||
28644c80 DP |
384 | static int regcache_rbtree_write(struct regmap *map, unsigned int reg, |
385 | unsigned int value) | |
386 | { | |
387 | struct regcache_rbtree_ctx *rbtree_ctx; | |
388 | struct regcache_rbtree_node *rbnode, *rbnode_tmp; | |
389 | struct rb_node *node; | |
28644c80 | 390 | unsigned int reg_tmp; |
28644c80 DP |
391 | int ret; |
392 | ||
393 | rbtree_ctx = map->cache; | |
0c7ed856 | 394 | |
28644c80 DP |
395 | /* if we can't locate it in the cached rbnode we'll have |
396 | * to traverse the rbtree looking for it. | |
397 | */ | |
3405addd | 398 | rbnode = regcache_rbtree_lookup(map, reg); |
28644c80 | 399 | if (rbnode) { |
f01ee60f | 400 | reg_tmp = (reg - rbnode->base_reg) / map->reg_stride; |
879082c9 | 401 | regcache_rbtree_set_register(map, rbnode, reg_tmp, value); |
28644c80 | 402 | } else { |
472fdec7 LPC |
403 | unsigned int base_reg, top_reg; |
404 | unsigned int new_base_reg, new_top_reg; | |
405 | unsigned int min, max; | |
406 | unsigned int max_dist; | |
407 | ||
408 | max_dist = map->reg_stride * sizeof(*rbnode_tmp) / | |
409 | map->cache_word_size; | |
410 | if (reg < max_dist) | |
411 | min = 0; | |
412 | else | |
413 | min = reg - max_dist; | |
414 | max = reg + max_dist; | |
415 | ||
28644c80 DP |
416 | /* look for an adjacent register to the one we are about to add */ |
417 | for (node = rb_first(&rbtree_ctx->root); node; | |
418 | node = rb_next(node)) { | |
f01ee60f SW |
419 | rbnode_tmp = rb_entry(node, struct regcache_rbtree_node, |
420 | node); | |
194c753a LPC |
421 | |
422 | regcache_rbtree_get_base_top_reg(map, rbnode_tmp, | |
423 | &base_reg, &top_reg); | |
424 | ||
472fdec7 LPC |
425 | if (base_reg <= max && top_reg >= min) { |
426 | new_base_reg = min(reg, base_reg); | |
427 | new_top_reg = max(reg, top_reg); | |
428 | } else { | |
194c753a | 429 | continue; |
28644c80 | 430 | } |
194c753a LPC |
431 | |
432 | ret = regcache_rbtree_insert_to_block(map, rbnode_tmp, | |
472fdec7 LPC |
433 | new_base_reg, |
434 | new_top_reg, reg, | |
435 | value); | |
194c753a LPC |
436 | if (ret) |
437 | return ret; | |
438 | rbtree_ctx->cached_rbnode = rbnode_tmp; | |
439 | return 0; | |
28644c80 | 440 | } |
0186645d MB |
441 | |
442 | /* We did not manage to find a place to insert it in | |
443 | * an existing block so create a new rbnode. | |
28644c80 | 444 | */ |
0186645d | 445 | rbnode = regcache_rbtree_node_alloc(map, reg); |
28644c80 DP |
446 | if (!rbnode) |
447 | return -ENOMEM; | |
0186645d MB |
448 | regcache_rbtree_set_register(map, rbnode, |
449 | reg - rbnode->base_reg, value); | |
f01ee60f | 450 | regcache_rbtree_insert(map, &rbtree_ctx->root, rbnode); |
28644c80 DP |
451 | rbtree_ctx->cached_rbnode = rbnode; |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
ac8d91c8 MB |
457 | static int regcache_rbtree_sync(struct regmap *map, unsigned int min, |
458 | unsigned int max) | |
28644c80 DP |
459 | { |
460 | struct regcache_rbtree_ctx *rbtree_ctx; | |
461 | struct rb_node *node; | |
462 | struct regcache_rbtree_node *rbnode; | |
b6752123 LPC |
463 | unsigned int base_reg, top_reg; |
464 | unsigned int start, end; | |
28644c80 | 465 | int ret; |
28644c80 DP |
466 | |
467 | rbtree_ctx = map->cache; | |
468 | for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) { | |
469 | rbnode = rb_entry(node, struct regcache_rbtree_node, node); | |
ac8d91c8 | 470 | |
b6752123 LPC |
471 | regcache_rbtree_get_base_top_reg(map, rbnode, &base_reg, |
472 | &top_reg); | |
473 | if (base_reg > max) | |
ac8d91c8 | 474 | break; |
b6752123 | 475 | if (top_reg < min) |
ac8d91c8 MB |
476 | continue; |
477 | ||
b6752123 LPC |
478 | if (min > base_reg) |
479 | start = (min - base_reg) / map->reg_stride; | |
ac8d91c8 | 480 | else |
b6752123 | 481 | start = 0; |
ac8d91c8 | 482 | |
b6752123 LPC |
483 | if (max < top_reg) |
484 | end = (max - base_reg) / map->reg_stride + 1; | |
ac8d91c8 MB |
485 | else |
486 | end = rbnode->blklen; | |
487 | ||
3f4ff561 LPC |
488 | ret = regcache_sync_block(map, rbnode->block, |
489 | rbnode->cache_present, | |
490 | rbnode->base_reg, start, end); | |
f8bd822c MB |
491 | if (ret != 0) |
492 | return ret; | |
28644c80 DP |
493 | } |
494 | ||
f8bd822c | 495 | return regmap_async_complete(map); |
28644c80 DP |
496 | } |
497 | ||
3f4ff561 LPC |
498 | static int regcache_rbtree_drop(struct regmap *map, unsigned int min, |
499 | unsigned int max) | |
500 | { | |
501 | struct regcache_rbtree_ctx *rbtree_ctx; | |
502 | struct regcache_rbtree_node *rbnode; | |
503 | struct rb_node *node; | |
504 | unsigned int base_reg, top_reg; | |
505 | unsigned int start, end; | |
506 | ||
507 | rbtree_ctx = map->cache; | |
508 | for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) { | |
509 | rbnode = rb_entry(node, struct regcache_rbtree_node, node); | |
510 | ||
511 | regcache_rbtree_get_base_top_reg(map, rbnode, &base_reg, | |
512 | &top_reg); | |
513 | if (base_reg > max) | |
514 | break; | |
515 | if (top_reg < min) | |
516 | continue; | |
517 | ||
518 | if (min > base_reg) | |
519 | start = (min - base_reg) / map->reg_stride; | |
520 | else | |
521 | start = 0; | |
522 | ||
523 | if (max < top_reg) | |
524 | end = (max - base_reg) / map->reg_stride + 1; | |
525 | else | |
526 | end = rbnode->blklen; | |
527 | ||
528 | bitmap_clear(rbnode->cache_present, start, end - start); | |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
28644c80 DP |
534 | struct regcache_ops regcache_rbtree_ops = { |
535 | .type = REGCACHE_RBTREE, | |
536 | .name = "rbtree", | |
537 | .init = regcache_rbtree_init, | |
538 | .exit = regcache_rbtree_exit, | |
5e0cbe78 LPC |
539 | #ifdef CONFIG_DEBUG_FS |
540 | .debugfs_init = rbtree_debugfs_init, | |
541 | #endif | |
28644c80 DP |
542 | .read = regcache_rbtree_read, |
543 | .write = regcache_rbtree_write, | |
3f4ff561 LPC |
544 | .sync = regcache_rbtree_sync, |
545 | .drop = regcache_rbtree_drop, | |
28644c80 | 546 | }; |