blob: 3ace102a2a0a4da1d3c0046181de2cca8b406d0e [file] [log] [blame]
Mike Turquette9d9f78e2012-03-15 23:11:20 -07001/*
2 * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
3 * Copyright (C) 2011 Richard Zhao, Linaro <richard.zhao@linaro.org>
4 * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Adjustable divider clock implementation
11 */
12
13#include <linux/clk-provider.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/io.h>
17#include <linux/err.h>
18#include <linux/string.h>
James Hogan1a3cd182013-01-15 10:28:05 +000019#include <linux/log2.h>
Mike Turquette9d9f78e2012-03-15 23:11:20 -070020
21/*
22 * DOC: basic adjustable divider clock that cannot gate
23 *
24 * Traits of this clock:
25 * prepare - clk_prepare only ensures that parents are prepared
26 * enable - clk_enable only ensures that parents are enabled
Brian Norris9556f9d2015-04-13 16:03:21 -070027 * rate - rate is adjustable. clk->rate = ceiling(parent->rate / divisor)
Mike Turquette9d9f78e2012-03-15 23:11:20 -070028 * parent - fixed parent. No clk_set_parent support
29 */
30
31#define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
32
Stephen Boydbca96902015-01-19 18:05:29 -080033#define div_mask(width) ((1 << (width)) - 1)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053034
Rajendra Nayak357c3f02012-06-29 19:06:32 +053035static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
36{
37 unsigned int maxdiv = 0;
38 const struct clk_div_table *clkt;
39
40 for (clkt = table; clkt->div; clkt++)
41 if (clkt->div > maxdiv)
42 maxdiv = clkt->div;
43 return maxdiv;
44}
45
Maxime COQUELIN774b5142014-01-29 17:24:07 +010046static unsigned int _get_table_mindiv(const struct clk_div_table *table)
47{
48 unsigned int mindiv = UINT_MAX;
49 const struct clk_div_table *clkt;
50
51 for (clkt = table; clkt->div; clkt++)
52 if (clkt->div < mindiv)
53 mindiv = clkt->div;
54 return mindiv;
55}
56
Stephen Boydbca96902015-01-19 18:05:29 -080057static unsigned int _get_maxdiv(const struct clk_div_table *table, u8 width,
58 unsigned long flags)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053059{
Stephen Boydbca96902015-01-19 18:05:29 -080060 if (flags & CLK_DIVIDER_ONE_BASED)
61 return div_mask(width);
62 if (flags & CLK_DIVIDER_POWER_OF_TWO)
63 return 1 << div_mask(width);
64 if (table)
65 return _get_table_maxdiv(table);
66 return div_mask(width) + 1;
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053067}
68
Rajendra Nayak357c3f02012-06-29 19:06:32 +053069static unsigned int _get_table_div(const struct clk_div_table *table,
70 unsigned int val)
71{
72 const struct clk_div_table *clkt;
73
74 for (clkt = table; clkt->div; clkt++)
75 if (clkt->val == val)
76 return clkt->div;
77 return 0;
78}
79
Stephen Boydbca96902015-01-19 18:05:29 -080080static unsigned int _get_div(const struct clk_div_table *table,
Jim Quinlanafe76c8f2015-05-15 15:45:47 -040081 unsigned int val, unsigned long flags, u8 width)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053082{
Stephen Boydbca96902015-01-19 18:05:29 -080083 if (flags & CLK_DIVIDER_ONE_BASED)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053084 return val;
Stephen Boydbca96902015-01-19 18:05:29 -080085 if (flags & CLK_DIVIDER_POWER_OF_TWO)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053086 return 1 << val;
Jim Quinlanafe76c8f2015-05-15 15:45:47 -040087 if (flags & CLK_DIVIDER_MAX_AT_ZERO)
88 return val ? val : div_mask(width) + 1;
Stephen Boydbca96902015-01-19 18:05:29 -080089 if (table)
90 return _get_table_div(table, val);
Rajendra Nayak6d9252b2012-05-17 15:52:13 +053091 return val + 1;
92}
93
Rajendra Nayak357c3f02012-06-29 19:06:32 +053094static unsigned int _get_table_val(const struct clk_div_table *table,
95 unsigned int div)
96{
97 const struct clk_div_table *clkt;
98
99 for (clkt = table; clkt->div; clkt++)
100 if (clkt->div == div)
101 return clkt->val;
102 return 0;
103}
104
Stephen Boydbca96902015-01-19 18:05:29 -0800105static unsigned int _get_val(const struct clk_div_table *table,
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400106 unsigned int div, unsigned long flags, u8 width)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530107{
Stephen Boydbca96902015-01-19 18:05:29 -0800108 if (flags & CLK_DIVIDER_ONE_BASED)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530109 return div;
Stephen Boydbca96902015-01-19 18:05:29 -0800110 if (flags & CLK_DIVIDER_POWER_OF_TWO)
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530111 return __ffs(div);
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400112 if (flags & CLK_DIVIDER_MAX_AT_ZERO)
113 return (div == div_mask(width) + 1) ? 0 : div;
Stephen Boydbca96902015-01-19 18:05:29 -0800114 if (table)
115 return _get_table_val(table, div);
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530116 return div - 1;
117}
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700118
Stephen Boydbca96902015-01-19 18:05:29 -0800119unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
120 unsigned int val,
121 const struct clk_div_table *table,
122 unsigned long flags)
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700123{
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400124 struct clk_divider *divider = to_clk_divider(hw);
Stephen Boydbca96902015-01-19 18:05:29 -0800125 unsigned int div;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700126
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400127 div = _get_div(table, val, flags, divider->width);
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530128 if (!div) {
Stephen Boydbca96902015-01-19 18:05:29 -0800129 WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO),
Soren Brinkmann056b20532013-04-02 15:36:56 -0700130 "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
Stephen Boyd2f508a92015-07-30 17:20:57 -0700131 clk_hw_get_name(hw));
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530132 return parent_rate;
133 }
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700134
Brian Norris9556f9d2015-04-13 16:03:21 -0700135 return DIV_ROUND_UP_ULL((u64)parent_rate, div);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700136}
Stephen Boydbca96902015-01-19 18:05:29 -0800137EXPORT_SYMBOL_GPL(divider_recalc_rate);
138
139static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
140 unsigned long parent_rate)
141{
142 struct clk_divider *divider = to_clk_divider(hw);
143 unsigned int val;
144
145 val = clk_readl(divider->reg) >> divider->shift;
146 val &= div_mask(divider->width);
147
148 return divider_recalc_rate(hw, parent_rate, val, divider->table,
149 divider->flags);
150}
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700151
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530152static bool _is_valid_table_div(const struct clk_div_table *table,
153 unsigned int div)
154{
155 const struct clk_div_table *clkt;
156
157 for (clkt = table; clkt->div; clkt++)
158 if (clkt->div == div)
159 return true;
160 return false;
161}
162
Stephen Boydbca96902015-01-19 18:05:29 -0800163static bool _is_valid_div(const struct clk_div_table *table, unsigned int div,
164 unsigned long flags)
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530165{
Stephen Boydbca96902015-01-19 18:05:29 -0800166 if (flags & CLK_DIVIDER_POWER_OF_TWO)
James Hogan1a3cd182013-01-15 10:28:05 +0000167 return is_power_of_2(div);
Stephen Boydbca96902015-01-19 18:05:29 -0800168 if (table)
169 return _is_valid_table_div(table, div);
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530170 return true;
171}
172
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100173static int _round_up_table(const struct clk_div_table *table, int div)
174{
175 const struct clk_div_table *clkt;
Maxime COQUELINfe52e752014-05-07 18:48:52 +0200176 int up = INT_MAX;
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100177
178 for (clkt = table; clkt->div; clkt++) {
179 if (clkt->div == div)
180 return clkt->div;
181 else if (clkt->div < div)
182 continue;
183
184 if ((clkt->div - div) < (up - div))
185 up = clkt->div;
186 }
187
188 return up;
189}
190
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100191static int _round_down_table(const struct clk_div_table *table, int div)
192{
193 const struct clk_div_table *clkt;
194 int down = _get_table_mindiv(table);
195
196 for (clkt = table; clkt->div; clkt++) {
197 if (clkt->div == div)
198 return clkt->div;
199 else if (clkt->div > div)
200 continue;
201
202 if ((div - clkt->div) < (div - down))
203 down = clkt->div;
204 }
205
206 return down;
207}
208
Stephen Boydbca96902015-01-19 18:05:29 -0800209static int _div_round_up(const struct clk_div_table *table,
210 unsigned long parent_rate, unsigned long rate,
211 unsigned long flags)
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100212{
Brian Norris9556f9d2015-04-13 16:03:21 -0700213 int div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100214
Stephen Boydbca96902015-01-19 18:05:29 -0800215 if (flags & CLK_DIVIDER_POWER_OF_TWO)
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100216 div = __roundup_pow_of_two(div);
Stephen Boydbca96902015-01-19 18:05:29 -0800217 if (table)
218 div = _round_up_table(table, div);
Maxime COQUELINdd23c2c2014-01-29 17:24:06 +0100219
220 return div;
221}
222
Stephen Boydbca96902015-01-19 18:05:29 -0800223static int _div_round_closest(const struct clk_div_table *table,
224 unsigned long parent_rate, unsigned long rate,
225 unsigned long flags)
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100226{
Uwe Kleine-König93155142015-02-21 11:40:25 +0100227 int up, down;
Uwe Kleine-König26bac952015-02-21 11:40:24 +0100228 unsigned long up_rate, down_rate;
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100229
Brian Norris9556f9d2015-04-13 16:03:21 -0700230 up = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
Uwe Kleine-König93155142015-02-21 11:40:25 +0100231 down = parent_rate / rate;
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100232
Stephen Boydbca96902015-01-19 18:05:29 -0800233 if (flags & CLK_DIVIDER_POWER_OF_TWO) {
Uwe Kleine-König93155142015-02-21 11:40:25 +0100234 up = __roundup_pow_of_two(up);
235 down = __rounddown_pow_of_two(down);
Stephen Boydbca96902015-01-19 18:05:29 -0800236 } else if (table) {
Uwe Kleine-König93155142015-02-21 11:40:25 +0100237 up = _round_up_table(table, up);
238 down = _round_down_table(table, down);
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100239 }
240
Brian Norris9556f9d2015-04-13 16:03:21 -0700241 up_rate = DIV_ROUND_UP_ULL((u64)parent_rate, up);
242 down_rate = DIV_ROUND_UP_ULL((u64)parent_rate, down);
Uwe Kleine-König26bac952015-02-21 11:40:24 +0100243
244 return (rate - up_rate) <= (down_rate - rate) ? up : down;
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100245}
246
Stephen Boydbca96902015-01-19 18:05:29 -0800247static int _div_round(const struct clk_div_table *table,
248 unsigned long parent_rate, unsigned long rate,
249 unsigned long flags)
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100250{
Stephen Boydbca96902015-01-19 18:05:29 -0800251 if (flags & CLK_DIVIDER_ROUND_CLOSEST)
252 return _div_round_closest(table, parent_rate, rate, flags);
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100253
Stephen Boydbca96902015-01-19 18:05:29 -0800254 return _div_round_up(table, parent_rate, rate, flags);
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100255}
256
Stephen Boydbca96902015-01-19 18:05:29 -0800257static bool _is_best_div(unsigned long rate, unsigned long now,
258 unsigned long best, unsigned long flags)
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100259{
Stephen Boydbca96902015-01-19 18:05:29 -0800260 if (flags & CLK_DIVIDER_ROUND_CLOSEST)
Maxime COQUELIN774b5142014-01-29 17:24:07 +0100261 return abs(rate - now) < abs(rate - best);
262
263 return now <= rate && now > best;
264}
265
Stephen Boydbca96902015-01-19 18:05:29 -0800266static int _next_div(const struct clk_div_table *table, int div,
267 unsigned long flags)
Maxime COQUELIN0e2de782014-01-29 17:24:08 +0100268{
269 div++;
270
Stephen Boydbca96902015-01-19 18:05:29 -0800271 if (flags & CLK_DIVIDER_POWER_OF_TWO)
Maxime COQUELIN0e2de782014-01-29 17:24:08 +0100272 return __roundup_pow_of_two(div);
Stephen Boydbca96902015-01-19 18:05:29 -0800273 if (table)
274 return _round_up_table(table, div);
Maxime COQUELIN0e2de782014-01-29 17:24:08 +0100275
276 return div;
277}
278
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700279static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
Stephen Boydbca96902015-01-19 18:05:29 -0800280 unsigned long *best_parent_rate,
281 const struct clk_div_table *table, u8 width,
282 unsigned long flags)
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700283{
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700284 int i, bestdiv = 0;
285 unsigned long parent_rate, best = 0, now, maxdiv;
Shawn Guo081c9022013-06-02 22:20:55 +0800286 unsigned long parent_rate_saved = *best_parent_rate;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700287
288 if (!rate)
289 rate = 1;
290
Stephen Boydbca96902015-01-19 18:05:29 -0800291 maxdiv = _get_maxdiv(table, width, flags);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700292
Stephen Boyd98d8a602015-06-29 16:56:30 -0700293 if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
Shawn Guo81536e02012-04-12 20:50:17 +0800294 parent_rate = *best_parent_rate;
Stephen Boydbca96902015-01-19 18:05:29 -0800295 bestdiv = _div_round(table, parent_rate, rate, flags);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700296 bestdiv = bestdiv == 0 ? 1 : bestdiv;
297 bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
298 return bestdiv;
299 }
300
301 /*
302 * The maximum divider we can use without overflowing
303 * unsigned long in rate * i below
304 */
305 maxdiv = min(ULONG_MAX / rate, maxdiv);
306
Stephen Boydbca96902015-01-19 18:05:29 -0800307 for (i = 1; i <= maxdiv; i = _next_div(table, i, flags)) {
308 if (!_is_valid_div(table, i, flags))
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530309 continue;
Shawn Guo081c9022013-06-02 22:20:55 +0800310 if (rate * i == parent_rate_saved) {
311 /*
312 * It's the most ideal case if the requested rate can be
313 * divided from parent clock without needing to change
314 * parent rate, so return the divider immediately.
315 */
316 *best_parent_rate = parent_rate_saved;
317 return i;
318 }
Stephen Boyd2f508a92015-07-30 17:20:57 -0700319 parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw),
Uwe Kleine-Königda321132015-02-21 11:40:23 +0100320 rate * i);
Brian Norris9556f9d2015-04-13 16:03:21 -0700321 now = DIV_ROUND_UP_ULL((u64)parent_rate, i);
Stephen Boydbca96902015-01-19 18:05:29 -0800322 if (_is_best_div(rate, now, best, flags)) {
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700323 bestdiv = i;
324 best = now;
325 *best_parent_rate = parent_rate;
326 }
327 }
328
329 if (!bestdiv) {
Stephen Boydbca96902015-01-19 18:05:29 -0800330 bestdiv = _get_maxdiv(table, width, flags);
Stephen Boyd2f508a92015-07-30 17:20:57 -0700331 *best_parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw), 1);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700332 }
333
334 return bestdiv;
335}
336
Stephen Boydbca96902015-01-19 18:05:29 -0800337long divider_round_rate(struct clk_hw *hw, unsigned long rate,
338 unsigned long *prate, const struct clk_div_table *table,
339 u8 width, unsigned long flags)
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700340{
341 int div;
Stephen Boydbca96902015-01-19 18:05:29 -0800342
343 div = clk_divider_bestdiv(hw, rate, prate, table, width, flags);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700344
Brian Norris9556f9d2015-04-13 16:03:21 -0700345 return DIV_ROUND_UP_ULL((u64)*prate, div);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700346}
Stephen Boydbca96902015-01-19 18:05:29 -0800347EXPORT_SYMBOL_GPL(divider_round_rate);
348
349static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
350 unsigned long *prate)
351{
352 struct clk_divider *divider = to_clk_divider(hw);
353 int bestdiv;
354
355 /* if read only, just return current value */
356 if (divider->flags & CLK_DIVIDER_READ_ONLY) {
357 bestdiv = readl(divider->reg) >> divider->shift;
358 bestdiv &= div_mask(divider->width);
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400359 bestdiv = _get_div(divider->table, bestdiv, divider->flags,
360 divider->width);
Brian Norris9556f9d2015-04-13 16:03:21 -0700361 return DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
Stephen Boydbca96902015-01-19 18:05:29 -0800362 }
363
364 return divider_round_rate(hw, rate, prate, divider->table,
365 divider->width, divider->flags);
366}
367
368int divider_get_val(unsigned long rate, unsigned long parent_rate,
369 const struct clk_div_table *table, u8 width,
370 unsigned long flags)
371{
372 unsigned int div, value;
373
Brian Norris9556f9d2015-04-13 16:03:21 -0700374 div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
Stephen Boydbca96902015-01-19 18:05:29 -0800375
376 if (!_is_valid_div(table, div, flags))
377 return -EINVAL;
378
Jim Quinlanafe76c8f2015-05-15 15:45:47 -0400379 value = _get_val(table, div, flags, width);
Stephen Boydbca96902015-01-19 18:05:29 -0800380
381 return min_t(unsigned int, value, div_mask(width));
382}
383EXPORT_SYMBOL_GPL(divider_get_val);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700384
Shawn Guo1c0035d2012-04-12 20:50:18 +0800385static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
386 unsigned long parent_rate)
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700387{
388 struct clk_divider *divider = to_clk_divider(hw);
Stephen Boydbca96902015-01-19 18:05:29 -0800389 unsigned int value;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700390 unsigned long flags = 0;
391 u32 val;
392
Stephen Boydbca96902015-01-19 18:05:29 -0800393 value = divider_get_val(rate, parent_rate, divider->table,
394 divider->width, divider->flags);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700395
396 if (divider->lock)
397 spin_lock_irqsave(divider->lock, flags);
Stephen Boyd661e2182015-07-24 12:21:12 -0700398 else
399 __acquire(divider->lock);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700400
Haojian Zhuangd57dfe72013-06-08 22:47:18 +0800401 if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
Stephen Boydbca96902015-01-19 18:05:29 -0800402 val = div_mask(divider->width) << (divider->shift + 16);
Haojian Zhuangd57dfe72013-06-08 22:47:18 +0800403 } else {
Gerhard Sittigaa514ce2013-07-22 14:14:40 +0200404 val = clk_readl(divider->reg);
Stephen Boydbca96902015-01-19 18:05:29 -0800405 val &= ~(div_mask(divider->width) << divider->shift);
Haojian Zhuangd57dfe72013-06-08 22:47:18 +0800406 }
Rajendra Nayak6d9252b2012-05-17 15:52:13 +0530407 val |= value << divider->shift;
Gerhard Sittigaa514ce2013-07-22 14:14:40 +0200408 clk_writel(val, divider->reg);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700409
410 if (divider->lock)
411 spin_unlock_irqrestore(divider->lock, flags);
Stephen Boyd661e2182015-07-24 12:21:12 -0700412 else
413 __release(divider->lock);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700414
415 return 0;
416}
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700417
Shawn Guo822c2502012-03-27 15:23:22 +0800418const struct clk_ops clk_divider_ops = {
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700419 .recalc_rate = clk_divider_recalc_rate,
420 .round_rate = clk_divider_round_rate,
421 .set_rate = clk_divider_set_rate,
422};
423EXPORT_SYMBOL_GPL(clk_divider_ops);
424
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530425static struct clk *_register_divider(struct device *dev, const char *name,
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700426 const char *parent_name, unsigned long flags,
427 void __iomem *reg, u8 shift, u8 width,
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530428 u8 clk_divider_flags, const struct clk_div_table *table,
429 spinlock_t *lock)
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700430{
431 struct clk_divider *div;
432 struct clk *clk;
Saravana Kannan0197b3e2012-04-25 22:58:56 -0700433 struct clk_init_data init;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700434
Haojian Zhuangd57dfe72013-06-08 22:47:18 +0800435 if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) {
436 if (width + shift > 16) {
437 pr_warn("divider value exceeds LOWORD field\n");
438 return ERR_PTR(-EINVAL);
439 }
440 }
441
Mike Turquette27d54592012-03-26 17:51:03 -0700442 /* allocate the divider */
Stephen Boydd122db72015-05-14 16:47:10 -0700443 div = kzalloc(sizeof(*div), GFP_KERNEL);
444 if (!div)
Mike Turquette27d54592012-03-26 17:51:03 -0700445 return ERR_PTR(-ENOMEM);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700446
Saravana Kannan0197b3e2012-04-25 22:58:56 -0700447 init.name = name;
James Hogane6d5e7d2014-11-14 15:32:09 +0000448 init.ops = &clk_divider_ops;
Rajendra Nayakf7d8caa2012-06-01 14:02:47 +0530449 init.flags = flags | CLK_IS_BASIC;
Saravana Kannan0197b3e2012-04-25 22:58:56 -0700450 init.parent_names = (parent_name ? &parent_name: NULL);
451 init.num_parents = (parent_name ? 1 : 0);
452
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700453 /* struct clk_divider assignments */
454 div->reg = reg;
455 div->shift = shift;
456 div->width = width;
457 div->flags = clk_divider_flags;
458 div->lock = lock;
Saravana Kannan0197b3e2012-04-25 22:58:56 -0700459 div->hw.init = &init;
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530460 div->table = table;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700461
Mike Turquette27d54592012-03-26 17:51:03 -0700462 /* register the clock */
Saravana Kannan0197b3e2012-04-25 22:58:56 -0700463 clk = clk_register(dev, &div->hw);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700464
Mike Turquette27d54592012-03-26 17:51:03 -0700465 if (IS_ERR(clk))
466 kfree(div);
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700467
Mike Turquette27d54592012-03-26 17:51:03 -0700468 return clk;
Mike Turquette9d9f78e2012-03-15 23:11:20 -0700469}
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530470
471/**
472 * clk_register_divider - register a divider clock with the clock framework
473 * @dev: device registering this clock
474 * @name: name of this clock
475 * @parent_name: name of clock's parent
476 * @flags: framework-specific flags
477 * @reg: register address to adjust divider
478 * @shift: number of bits to shift the bitfield
479 * @width: width of the bitfield
480 * @clk_divider_flags: divider-specific flags for this clock
481 * @lock: shared register lock for this clock
482 */
483struct clk *clk_register_divider(struct device *dev, const char *name,
484 const char *parent_name, unsigned long flags,
485 void __iomem *reg, u8 shift, u8 width,
486 u8 clk_divider_flags, spinlock_t *lock)
487{
488 return _register_divider(dev, name, parent_name, flags, reg, shift,
489 width, clk_divider_flags, NULL, lock);
490}
Fabio Estevam4c5eeea2013-08-02 13:14:07 -0300491EXPORT_SYMBOL_GPL(clk_register_divider);
Rajendra Nayak357c3f02012-06-29 19:06:32 +0530492
493/**
494 * clk_register_divider_table - register a table based divider clock with
495 * the clock framework
496 * @dev: device registering this clock
497 * @name: name of this clock
498 * @parent_name: name of clock's parent
499 * @flags: framework-specific flags
500 * @reg: register address to adjust divider
501 * @shift: number of bits to shift the bitfield
502 * @width: width of the bitfield
503 * @clk_divider_flags: divider-specific flags for this clock
504 * @table: array of divider/value pairs ending with a div set to 0
505 * @lock: shared register lock for this clock
506 */
507struct clk *clk_register_divider_table(struct device *dev, const char *name,
508 const char *parent_name, unsigned long flags,
509 void __iomem *reg, u8 shift, u8 width,
510 u8 clk_divider_flags, const struct clk_div_table *table,
511 spinlock_t *lock)
512{
513 return _register_divider(dev, name, parent_name, flags, reg, shift,
514 width, clk_divider_flags, table, lock);
515}
Fabio Estevam4c5eeea2013-08-02 13:14:07 -0300516EXPORT_SYMBOL_GPL(clk_register_divider_table);
Krzysztof Kozlowski4e3c0212015-01-05 10:52:40 +0100517
518void clk_unregister_divider(struct clk *clk)
519{
520 struct clk_divider *div;
521 struct clk_hw *hw;
522
523 hw = __clk_get_hw(clk);
524 if (!hw)
525 return;
526
527 div = to_clk_divider(hw);
528
529 clk_unregister(clk);
530 kfree(div);
531}
532EXPORT_SYMBOL_GPL(clk_unregister_divider);