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b4761198 TK |
1 | /* |
2 | * TI Divider Clock | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments, Inc. | |
5 | * | |
6 | * Tero Kristo <t-kristo@ti.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 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/clk-provider.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/of_address.h> | |
23 | #include <linux/clk/ti.h> | |
d96f774b | 24 | #include "clock.h" |
b4761198 TK |
25 | |
26 | #undef pr_fmt | |
27 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
28 | ||
b4761198 TK |
29 | #define div_mask(d) ((1 << ((d)->width)) - 1) |
30 | ||
31 | static unsigned int _get_table_maxdiv(const struct clk_div_table *table) | |
32 | { | |
33 | unsigned int maxdiv = 0; | |
34 | const struct clk_div_table *clkt; | |
35 | ||
36 | for (clkt = table; clkt->div; clkt++) | |
37 | if (clkt->div > maxdiv) | |
38 | maxdiv = clkt->div; | |
39 | return maxdiv; | |
40 | } | |
41 | ||
6dbde947 | 42 | static unsigned int _get_maxdiv(struct clk_omap_divider *divider) |
b4761198 TK |
43 | { |
44 | if (divider->flags & CLK_DIVIDER_ONE_BASED) | |
45 | return div_mask(divider); | |
46 | if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) | |
47 | return 1 << div_mask(divider); | |
48 | if (divider->table) | |
49 | return _get_table_maxdiv(divider->table); | |
50 | return div_mask(divider) + 1; | |
51 | } | |
52 | ||
53 | static unsigned int _get_table_div(const struct clk_div_table *table, | |
54 | unsigned int val) | |
55 | { | |
56 | const struct clk_div_table *clkt; | |
57 | ||
58 | for (clkt = table; clkt->div; clkt++) | |
59 | if (clkt->val == val) | |
60 | return clkt->div; | |
61 | return 0; | |
62 | } | |
63 | ||
6dbde947 | 64 | static unsigned int _get_div(struct clk_omap_divider *divider, unsigned int val) |
b4761198 TK |
65 | { |
66 | if (divider->flags & CLK_DIVIDER_ONE_BASED) | |
67 | return val; | |
68 | if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) | |
69 | return 1 << val; | |
70 | if (divider->table) | |
71 | return _get_table_div(divider->table, val); | |
72 | return val + 1; | |
73 | } | |
74 | ||
75 | static unsigned int _get_table_val(const struct clk_div_table *table, | |
76 | unsigned int div) | |
77 | { | |
78 | const struct clk_div_table *clkt; | |
79 | ||
80 | for (clkt = table; clkt->div; clkt++) | |
81 | if (clkt->div == div) | |
82 | return clkt->val; | |
83 | return 0; | |
84 | } | |
85 | ||
6dbde947 | 86 | static unsigned int _get_val(struct clk_omap_divider *divider, u8 div) |
b4761198 TK |
87 | { |
88 | if (divider->flags & CLK_DIVIDER_ONE_BASED) | |
89 | return div; | |
90 | if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) | |
91 | return __ffs(div); | |
92 | if (divider->table) | |
93 | return _get_table_val(divider->table, div); | |
94 | return div - 1; | |
95 | } | |
96 | ||
97 | static unsigned long ti_clk_divider_recalc_rate(struct clk_hw *hw, | |
98 | unsigned long parent_rate) | |
99 | { | |
6dbde947 | 100 | struct clk_omap_divider *divider = to_clk_omap_divider(hw); |
b4761198 TK |
101 | unsigned int div, val; |
102 | ||
6c0afb50 | 103 | val = ti_clk_ll_ops->clk_readl(÷r->reg) >> divider->shift; |
b4761198 TK |
104 | val &= div_mask(divider); |
105 | ||
106 | div = _get_div(divider, val); | |
107 | if (!div) { | |
108 | WARN(!(divider->flags & CLK_DIVIDER_ALLOW_ZERO), | |
109 | "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n", | |
a53ad8ef | 110 | clk_hw_get_name(hw)); |
b4761198 TK |
111 | return parent_rate; |
112 | } | |
113 | ||
7e50e7e1 | 114 | return DIV_ROUND_UP(parent_rate, div); |
b4761198 TK |
115 | } |
116 | ||
117 | /* | |
118 | * The reverse of DIV_ROUND_UP: The maximum number which | |
119 | * divided by m is r | |
120 | */ | |
121 | #define MULT_ROUND_UP(r, m) ((r) * (m) + (m) - 1) | |
122 | ||
123 | static bool _is_valid_table_div(const struct clk_div_table *table, | |
124 | unsigned int div) | |
125 | { | |
126 | const struct clk_div_table *clkt; | |
127 | ||
128 | for (clkt = table; clkt->div; clkt++) | |
129 | if (clkt->div == div) | |
130 | return true; | |
131 | return false; | |
132 | } | |
133 | ||
6dbde947 | 134 | static bool _is_valid_div(struct clk_omap_divider *divider, unsigned int div) |
b4761198 TK |
135 | { |
136 | if (divider->flags & CLK_DIVIDER_POWER_OF_TWO) | |
137 | return is_power_of_2(div); | |
138 | if (divider->table) | |
139 | return _is_valid_table_div(divider->table, div); | |
140 | return true; | |
141 | } | |
142 | ||
ced30683 K |
143 | static int _div_round_up(const struct clk_div_table *table, |
144 | unsigned long parent_rate, unsigned long rate) | |
145 | { | |
146 | const struct clk_div_table *clkt; | |
147 | int up = INT_MAX; | |
148 | int div = DIV_ROUND_UP_ULL((u64)parent_rate, rate); | |
149 | ||
150 | for (clkt = table; clkt->div; clkt++) { | |
151 | if (clkt->div == div) | |
152 | return clkt->div; | |
153 | else if (clkt->div < div) | |
154 | continue; | |
155 | ||
156 | if ((clkt->div - div) < (up - div)) | |
157 | up = clkt->div; | |
158 | } | |
159 | ||
160 | return up; | |
161 | } | |
162 | ||
163 | static int _div_round(const struct clk_div_table *table, | |
164 | unsigned long parent_rate, unsigned long rate) | |
165 | { | |
166 | if (!table) | |
167 | return DIV_ROUND_UP(parent_rate, rate); | |
168 | ||
169 | return _div_round_up(table, parent_rate, rate); | |
170 | } | |
171 | ||
b4761198 TK |
172 | static int ti_clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate, |
173 | unsigned long *best_parent_rate) | |
174 | { | |
6dbde947 | 175 | struct clk_omap_divider *divider = to_clk_omap_divider(hw); |
b4761198 TK |
176 | int i, bestdiv = 0; |
177 | unsigned long parent_rate, best = 0, now, maxdiv; | |
178 | unsigned long parent_rate_saved = *best_parent_rate; | |
179 | ||
180 | if (!rate) | |
181 | rate = 1; | |
182 | ||
183 | maxdiv = _get_maxdiv(divider); | |
184 | ||
98d8a60e | 185 | if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) { |
b4761198 | 186 | parent_rate = *best_parent_rate; |
ced30683 | 187 | bestdiv = _div_round(divider->table, parent_rate, rate); |
b4761198 TK |
188 | bestdiv = bestdiv == 0 ? 1 : bestdiv; |
189 | bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv; | |
190 | return bestdiv; | |
191 | } | |
192 | ||
193 | /* | |
194 | * The maximum divider we can use without overflowing | |
195 | * unsigned long in rate * i below | |
196 | */ | |
197 | maxdiv = min(ULONG_MAX / rate, maxdiv); | |
198 | ||
199 | for (i = 1; i <= maxdiv; i++) { | |
200 | if (!_is_valid_div(divider, i)) | |
201 | continue; | |
202 | if (rate * i == parent_rate_saved) { | |
203 | /* | |
204 | * It's the most ideal case if the requested rate can be | |
205 | * divided from parent clock without needing to change | |
206 | * parent rate, so return the divider immediately. | |
207 | */ | |
208 | *best_parent_rate = parent_rate_saved; | |
209 | return i; | |
210 | } | |
a53ad8ef | 211 | parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw), |
b4761198 | 212 | MULT_ROUND_UP(rate, i)); |
7e50e7e1 | 213 | now = DIV_ROUND_UP(parent_rate, i); |
b4761198 TK |
214 | if (now <= rate && now > best) { |
215 | bestdiv = i; | |
216 | best = now; | |
217 | *best_parent_rate = parent_rate; | |
218 | } | |
219 | } | |
220 | ||
221 | if (!bestdiv) { | |
222 | bestdiv = _get_maxdiv(divider); | |
223 | *best_parent_rate = | |
a53ad8ef | 224 | clk_hw_round_rate(clk_hw_get_parent(hw), 1); |
b4761198 TK |
225 | } |
226 | ||
227 | return bestdiv; | |
228 | } | |
229 | ||
230 | static long ti_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate, | |
231 | unsigned long *prate) | |
232 | { | |
233 | int div; | |
234 | div = ti_clk_divider_bestdiv(hw, rate, prate); | |
235 | ||
7e50e7e1 | 236 | return DIV_ROUND_UP(*prate, div); |
b4761198 TK |
237 | } |
238 | ||
239 | static int ti_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate, | |
240 | unsigned long parent_rate) | |
241 | { | |
6dbde947 | 242 | struct clk_omap_divider *divider; |
b4761198 | 243 | unsigned int div, value; |
b4761198 TK |
244 | u32 val; |
245 | ||
2f103251 NM |
246 | if (!hw || !rate) |
247 | return -EINVAL; | |
248 | ||
6dbde947 | 249 | divider = to_clk_omap_divider(hw); |
2f103251 | 250 | |
7e50e7e1 | 251 | div = DIV_ROUND_UP(parent_rate, rate); |
b4761198 TK |
252 | value = _get_val(divider, div); |
253 | ||
254 | if (value > div_mask(divider)) | |
255 | value = div_mask(divider); | |
256 | ||
b4761198 TK |
257 | if (divider->flags & CLK_DIVIDER_HIWORD_MASK) { |
258 | val = div_mask(divider) << (divider->shift + 16); | |
259 | } else { | |
6c0afb50 | 260 | val = ti_clk_ll_ops->clk_readl(÷r->reg); |
b4761198 TK |
261 | val &= ~(div_mask(divider) << divider->shift); |
262 | } | |
263 | val |= value << divider->shift; | |
6c0afb50 | 264 | ti_clk_ll_ops->clk_writel(val, ÷r->reg); |
b4761198 | 265 | |
b4761198 TK |
266 | return 0; |
267 | } | |
268 | ||
269 | const struct clk_ops ti_clk_divider_ops = { | |
270 | .recalc_rate = ti_clk_divider_recalc_rate, | |
271 | .round_rate = ti_clk_divider_round_rate, | |
272 | .set_rate = ti_clk_divider_set_rate, | |
273 | }; | |
274 | ||
275 | static struct clk *_register_divider(struct device *dev, const char *name, | |
276 | const char *parent_name, | |
6c0afb50 TK |
277 | unsigned long flags, |
278 | struct clk_omap_reg *reg, | |
b4761198 | 279 | u8 shift, u8 width, u8 clk_divider_flags, |
167af5ef | 280 | const struct clk_div_table *table) |
b4761198 | 281 | { |
6dbde947 | 282 | struct clk_omap_divider *div; |
b4761198 TK |
283 | struct clk *clk; |
284 | struct clk_init_data init; | |
285 | ||
286 | if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) { | |
287 | if (width + shift > 16) { | |
288 | pr_warn("divider value exceeds LOWORD field\n"); | |
289 | return ERR_PTR(-EINVAL); | |
290 | } | |
291 | } | |
292 | ||
293 | /* allocate the divider */ | |
294 | div = kzalloc(sizeof(*div), GFP_KERNEL); | |
295 | if (!div) { | |
296 | pr_err("%s: could not allocate divider clk\n", __func__); | |
297 | return ERR_PTR(-ENOMEM); | |
298 | } | |
299 | ||
300 | init.name = name; | |
301 | init.ops = &ti_clk_divider_ops; | |
302 | init.flags = flags | CLK_IS_BASIC; | |
303 | init.parent_names = (parent_name ? &parent_name : NULL); | |
304 | init.num_parents = (parent_name ? 1 : 0); | |
305 | ||
306 | /* struct clk_divider assignments */ | |
6c0afb50 | 307 | memcpy(&div->reg, reg, sizeof(*reg)); |
b4761198 TK |
308 | div->shift = shift; |
309 | div->width = width; | |
310 | div->flags = clk_divider_flags; | |
b4761198 TK |
311 | div->hw.init = &init; |
312 | div->table = table; | |
313 | ||
314 | /* register the clock */ | |
1ae79c46 | 315 | clk = ti_clk_register(dev, &div->hw, name); |
b4761198 TK |
316 | |
317 | if (IS_ERR(clk)) | |
318 | kfree(div); | |
319 | ||
320 | return clk; | |
321 | } | |
322 | ||
4f6be565 TK |
323 | int ti_clk_parse_divider_data(int *div_table, int num_dividers, int max_div, |
324 | u8 flags, u8 *width, | |
325 | const struct clk_div_table **table) | |
d96f774b TK |
326 | { |
327 | int valid_div = 0; | |
d96f774b | 328 | u32 val; |
4f6be565 TK |
329 | int div; |
330 | int i; | |
331 | struct clk_div_table *tmp; | |
d96f774b | 332 | |
4f6be565 | 333 | if (!div_table) { |
d96f774b TK |
334 | if (flags & CLKF_INDEX_STARTS_AT_ONE) |
335 | val = 1; | |
336 | else | |
337 | val = 0; | |
338 | ||
339 | div = 1; | |
340 | ||
4f6be565 | 341 | while (div < max_div) { |
d96f774b TK |
342 | if (flags & CLKF_INDEX_POWER_OF_TWO) |
343 | div <<= 1; | |
344 | else | |
345 | div++; | |
346 | val++; | |
347 | } | |
348 | ||
349 | *width = fls(val); | |
4f6be565 | 350 | *table = NULL; |
d96f774b | 351 | |
4f6be565 | 352 | return 0; |
d96f774b TK |
353 | } |
354 | ||
4f6be565 TK |
355 | i = 0; |
356 | ||
357 | while (!num_dividers || i < num_dividers) { | |
358 | if (div_table[i] == -1) | |
359 | break; | |
360 | if (div_table[i]) | |
d96f774b | 361 | valid_div++; |
4f6be565 TK |
362 | i++; |
363 | } | |
d96f774b | 364 | |
4f6be565 TK |
365 | num_dividers = i; |
366 | ||
367 | tmp = kzalloc(sizeof(*tmp) * (valid_div + 1), GFP_KERNEL); | |
368 | if (!tmp) | |
369 | return -ENOMEM; | |
d96f774b TK |
370 | |
371 | valid_div = 0; | |
372 | *width = 0; | |
373 | ||
4f6be565 TK |
374 | for (i = 0; i < num_dividers; i++) |
375 | if (div_table[i] > 0) { | |
376 | tmp[valid_div].div = div_table[i]; | |
377 | tmp[valid_div].val = i; | |
d96f774b TK |
378 | valid_div++; |
379 | *width = i; | |
380 | } | |
381 | ||
382 | *width = fls(*width); | |
4f6be565 TK |
383 | *table = tmp; |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static const struct clk_div_table * | |
389 | _get_div_table_from_setup(struct ti_clk_divider *setup, u8 *width) | |
390 | { | |
391 | const struct clk_div_table *table = NULL; | |
392 | ||
393 | ti_clk_parse_divider_data(setup->dividers, setup->num_dividers, | |
394 | setup->max_div, setup->flags, width, | |
395 | &table); | |
d96f774b TK |
396 | |
397 | return table; | |
398 | } | |
399 | ||
400 | struct clk_hw *ti_clk_build_component_div(struct ti_clk_divider *setup) | |
401 | { | |
6dbde947 | 402 | struct clk_omap_divider *div; |
d96f774b TK |
403 | struct clk_omap_reg *reg; |
404 | ||
405 | if (!setup) | |
406 | return NULL; | |
407 | ||
408 | div = kzalloc(sizeof(*div), GFP_KERNEL); | |
409 | if (!div) | |
410 | return ERR_PTR(-ENOMEM); | |
411 | ||
412 | reg = (struct clk_omap_reg *)&div->reg; | |
413 | reg->index = setup->module; | |
414 | reg->offset = setup->reg; | |
415 | ||
416 | if (setup->flags & CLKF_INDEX_STARTS_AT_ONE) | |
417 | div->flags |= CLK_DIVIDER_ONE_BASED; | |
418 | ||
419 | if (setup->flags & CLKF_INDEX_POWER_OF_TWO) | |
420 | div->flags |= CLK_DIVIDER_POWER_OF_TWO; | |
421 | ||
422 | div->table = _get_div_table_from_setup(setup, &div->width); | |
423 | ||
424 | div->shift = setup->bit_shift; | |
425 | ||
426 | return &div->hw; | |
427 | } | |
428 | ||
429 | struct clk *ti_clk_register_divider(struct ti_clk *setup) | |
430 | { | |
3417f352 AB |
431 | struct ti_clk_divider *div = setup->data; |
432 | struct clk_omap_reg reg = { | |
433 | .index = div->module, | |
434 | .offset = div->reg, | |
435 | }; | |
d96f774b TK |
436 | u8 width; |
437 | u32 flags = 0; | |
438 | u8 div_flags = 0; | |
4f6be565 | 439 | const struct clk_div_table *table; |
d96f774b TK |
440 | struct clk *clk; |
441 | ||
d96f774b TK |
442 | if (div->flags & CLKF_INDEX_STARTS_AT_ONE) |
443 | div_flags |= CLK_DIVIDER_ONE_BASED; | |
444 | ||
445 | if (div->flags & CLKF_INDEX_POWER_OF_TWO) | |
446 | div_flags |= CLK_DIVIDER_POWER_OF_TWO; | |
447 | ||
448 | if (div->flags & CLKF_SET_RATE_PARENT) | |
449 | flags |= CLK_SET_RATE_PARENT; | |
450 | ||
451 | table = _get_div_table_from_setup(div, &width); | |
452 | if (IS_ERR(table)) | |
453 | return (struct clk *)table; | |
454 | ||
455 | clk = _register_divider(NULL, setup->name, div->parent, | |
3417f352 | 456 | flags, ®, div->bit_shift, |
167af5ef | 457 | width, div_flags, table); |
d96f774b TK |
458 | |
459 | if (IS_ERR(clk)) | |
460 | kfree(table); | |
461 | ||
462 | return clk; | |
463 | } | |
464 | ||
e8627a9e BW |
465 | static struct clk_div_table * |
466 | __init ti_clk_get_div_table(struct device_node *node) | |
b4761198 TK |
467 | { |
468 | struct clk_div_table *table; | |
469 | const __be32 *divspec; | |
470 | u32 val; | |
471 | u32 num_div; | |
472 | u32 valid_div; | |
473 | int i; | |
474 | ||
475 | divspec = of_get_property(node, "ti,dividers", &num_div); | |
476 | ||
477 | if (!divspec) | |
478 | return NULL; | |
479 | ||
480 | num_div /= 4; | |
481 | ||
482 | valid_div = 0; | |
483 | ||
484 | /* Determine required size for divider table */ | |
485 | for (i = 0; i < num_div; i++) { | |
486 | of_property_read_u32_index(node, "ti,dividers", i, &val); | |
487 | if (val) | |
488 | valid_div++; | |
489 | } | |
490 | ||
491 | if (!valid_div) { | |
492 | pr_err("no valid dividers for %s table\n", node->name); | |
493 | return ERR_PTR(-EINVAL); | |
494 | } | |
495 | ||
496 | table = kzalloc(sizeof(*table) * (valid_div + 1), GFP_KERNEL); | |
497 | ||
498 | if (!table) | |
499 | return ERR_PTR(-ENOMEM); | |
500 | ||
501 | valid_div = 0; | |
502 | ||
503 | for (i = 0; i < num_div; i++) { | |
504 | of_property_read_u32_index(node, "ti,dividers", i, &val); | |
505 | if (val) { | |
506 | table[valid_div].div = val; | |
507 | table[valid_div].val = i; | |
508 | valid_div++; | |
509 | } | |
510 | } | |
511 | ||
512 | return table; | |
513 | } | |
514 | ||
515 | static int _get_divider_width(struct device_node *node, | |
516 | const struct clk_div_table *table, | |
517 | u8 flags) | |
518 | { | |
519 | u32 min_div; | |
520 | u32 max_div; | |
521 | u32 val = 0; | |
522 | u32 div; | |
523 | ||
524 | if (!table) { | |
525 | /* Clk divider table not provided, determine min/max divs */ | |
526 | if (of_property_read_u32(node, "ti,min-div", &min_div)) | |
527 | min_div = 1; | |
528 | ||
529 | if (of_property_read_u32(node, "ti,max-div", &max_div)) { | |
530 | pr_err("no max-div for %s!\n", node->name); | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
534 | /* Determine bit width for the field */ | |
535 | if (flags & CLK_DIVIDER_ONE_BASED) | |
536 | val = 1; | |
537 | ||
538 | div = min_div; | |
539 | ||
540 | while (div < max_div) { | |
541 | if (flags & CLK_DIVIDER_POWER_OF_TWO) | |
542 | div <<= 1; | |
543 | else | |
544 | div++; | |
545 | val++; | |
546 | } | |
547 | } else { | |
548 | div = 0; | |
549 | ||
550 | while (table[div].div) { | |
551 | val = table[div].val; | |
552 | div++; | |
553 | } | |
554 | } | |
555 | ||
556 | return fls(val); | |
557 | } | |
558 | ||
559 | static int __init ti_clk_divider_populate(struct device_node *node, | |
6c0afb50 | 560 | struct clk_omap_reg *reg, const struct clk_div_table **table, |
b4761198 TK |
561 | u32 *flags, u8 *div_flags, u8 *width, u8 *shift) |
562 | { | |
563 | u32 val; | |
6c0afb50 | 564 | int ret; |
b4761198 | 565 | |
6c0afb50 TK |
566 | ret = ti_clk_get_reg_addr(node, 0, reg); |
567 | if (ret) | |
568 | return ret; | |
b4761198 TK |
569 | |
570 | if (!of_property_read_u32(node, "ti,bit-shift", &val)) | |
571 | *shift = val; | |
572 | else | |
573 | *shift = 0; | |
574 | ||
575 | *flags = 0; | |
576 | *div_flags = 0; | |
577 | ||
578 | if (of_property_read_bool(node, "ti,index-starts-at-one")) | |
579 | *div_flags |= CLK_DIVIDER_ONE_BASED; | |
580 | ||
581 | if (of_property_read_bool(node, "ti,index-power-of-two")) | |
582 | *div_flags |= CLK_DIVIDER_POWER_OF_TWO; | |
583 | ||
584 | if (of_property_read_bool(node, "ti,set-rate-parent")) | |
585 | *flags |= CLK_SET_RATE_PARENT; | |
586 | ||
587 | *table = ti_clk_get_div_table(node); | |
588 | ||
589 | if (IS_ERR(*table)) | |
590 | return PTR_ERR(*table); | |
591 | ||
592 | *width = _get_divider_width(node, *table, *div_flags); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
597 | /** | |
598 | * of_ti_divider_clk_setup - Setup function for simple div rate clock | |
599 | * @node: device node for this clock | |
600 | * | |
601 | * Sets up a basic divider clock. | |
602 | */ | |
603 | static void __init of_ti_divider_clk_setup(struct device_node *node) | |
604 | { | |
605 | struct clk *clk; | |
606 | const char *parent_name; | |
6c0afb50 | 607 | struct clk_omap_reg reg; |
b4761198 TK |
608 | u8 clk_divider_flags = 0; |
609 | u8 width = 0; | |
610 | u8 shift = 0; | |
611 | const struct clk_div_table *table = NULL; | |
612 | u32 flags = 0; | |
613 | ||
614 | parent_name = of_clk_get_parent_name(node, 0); | |
615 | ||
616 | if (ti_clk_divider_populate(node, ®, &table, &flags, | |
617 | &clk_divider_flags, &width, &shift)) | |
618 | goto cleanup; | |
619 | ||
6c0afb50 | 620 | clk = _register_divider(NULL, node->name, parent_name, flags, ®, |
167af5ef | 621 | shift, width, clk_divider_flags, table); |
b4761198 TK |
622 | |
623 | if (!IS_ERR(clk)) { | |
624 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
625 | of_ti_clk_autoidle_setup(node); | |
626 | return; | |
627 | } | |
628 | ||
629 | cleanup: | |
630 | kfree(table); | |
631 | } | |
632 | CLK_OF_DECLARE(divider_clk, "ti,divider-clock", of_ti_divider_clk_setup); | |
633 | ||
634 | static void __init of_ti_composite_divider_clk_setup(struct device_node *node) | |
635 | { | |
6dbde947 | 636 | struct clk_omap_divider *div; |
b4761198 TK |
637 | u32 val; |
638 | ||
639 | div = kzalloc(sizeof(*div), GFP_KERNEL); | |
640 | if (!div) | |
641 | return; | |
642 | ||
643 | if (ti_clk_divider_populate(node, &div->reg, &div->table, &val, | |
644 | &div->flags, &div->width, &div->shift) < 0) | |
645 | goto cleanup; | |
646 | ||
647 | if (!ti_clk_add_component(node, &div->hw, CLK_COMPONENT_TYPE_DIVIDER)) | |
648 | return; | |
649 | ||
650 | cleanup: | |
651 | kfree(div->table); | |
652 | kfree(div); | |
653 | } | |
654 | CLK_OF_DECLARE(ti_composite_divider_clk, "ti,composite-divider-clock", | |
655 | of_ti_composite_divider_clk_setup); |