blob: 0ca74d07005830cec5abaf92a84c59af17325616 [file] [log] [blame]
Shawn Guo95ceafd2012-09-06 07:09:11 +00001/*
2 * Copyright (C) 2012 Freescale Semiconductor, Inc.
3 *
Viresh Kumar748c8762014-08-28 11:22:24 +05304 * Copyright (C) 2014 Linaro.
5 * Viresh Kumar <viresh.kumar@linaro.org>
6 *
Viresh Kumarbbcf0712014-09-09 19:58:03 +05307 * The OPP code in function set_target() is reused from
Shawn Guo95ceafd2012-09-06 07:09:11 +00008 * drivers/cpufreq/omap-cpufreq.c
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/clk.h>
Sudeep KarkadaNageshae1825b22013-09-10 18:59:46 +010018#include <linux/cpu.h>
Eduardo Valentin77cff592013-07-15 09:09:14 -040019#include <linux/cpu_cooling.h>
Shawn Guo95ceafd2012-09-06 07:09:11 +000020#include <linux/cpufreq.h>
Thomas Petazzoni34e5a522014-10-19 11:30:28 +020021#include <linux/cpufreq-dt.h>
Eduardo Valentin77cff592013-07-15 09:09:14 -040022#include <linux/cpumask.h>
Shawn Guo95ceafd2012-09-06 07:09:11 +000023#include <linux/err.h>
24#include <linux/module.h>
25#include <linux/of.h>
Nishanth Menone4db1c72013-09-19 16:03:52 -050026#include <linux/pm_opp.h>
Shawn Guo5553f9e2013-01-30 14:27:49 +000027#include <linux/platform_device.h>
Shawn Guo95ceafd2012-09-06 07:09:11 +000028#include <linux/regulator/consumer.h>
29#include <linux/slab.h>
Eduardo Valentin77cff592013-07-15 09:09:14 -040030#include <linux/thermal.h>
Shawn Guo95ceafd2012-09-06 07:09:11 +000031
Viresh Kumard2f31f12014-08-28 11:22:28 +053032struct private_data {
33 struct device *cpu_dev;
34 struct regulator *cpu_reg;
35 struct thermal_cooling_device *cdev;
36 unsigned int voltage_tolerance; /* in percentage */
37};
Shawn Guo95ceafd2012-09-06 07:09:11 +000038
Bartlomiej Zolnierkiewicz21c36d32015-08-07 13:59:16 +020039static struct freq_attr *cpufreq_dt_attr[] = {
40 &cpufreq_freq_attr_scaling_available_freqs,
41 NULL, /* Extra space for boost-attr if required */
42 NULL,
43};
44
Viresh Kumarbbcf0712014-09-09 19:58:03 +053045static int set_target(struct cpufreq_policy *policy, unsigned int index)
Shawn Guo95ceafd2012-09-06 07:09:11 +000046{
Nishanth Menon47d43ba2013-09-19 16:03:51 -050047 struct dev_pm_opp *opp;
Viresh Kumard2f31f12014-08-28 11:22:28 +053048 struct cpufreq_frequency_table *freq_table = policy->freq_table;
49 struct clk *cpu_clk = policy->clk;
50 struct private_data *priv = policy->driver_data;
51 struct device *cpu_dev = priv->cpu_dev;
52 struct regulator *cpu_reg = priv->cpu_reg;
Andrzej Hajda929ca892015-12-30 12:18:42 +010053 unsigned long volt = 0, tol = 0;
54 int volt_old = 0;
Viresh Kumard4019f02013-08-14 19:38:24 +053055 unsigned int old_freq, new_freq;
Guennadi Liakhovetski0ca68432013-02-25 18:22:37 +010056 long freq_Hz, freq_exact;
Shawn Guo95ceafd2012-09-06 07:09:11 +000057 int ret;
58
Shawn Guo95ceafd2012-09-06 07:09:11 +000059 freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
Paul Walmsley2209b0c2013-11-25 18:01:18 -080060 if (freq_Hz <= 0)
Shawn Guo95ceafd2012-09-06 07:09:11 +000061 freq_Hz = freq_table[index].frequency * 1000;
Shawn Guo95ceafd2012-09-06 07:09:11 +000062
Viresh Kumard4019f02013-08-14 19:38:24 +053063 freq_exact = freq_Hz;
64 new_freq = freq_Hz / 1000;
65 old_freq = clk_get_rate(cpu_clk) / 1000;
Shawn Guo95ceafd2012-09-06 07:09:11 +000066
Mark Brown4a511de2013-08-13 14:58:24 +020067 if (!IS_ERR(cpu_reg)) {
Stefan Wahren0a1e8792014-10-17 22:09:48 +000068 unsigned long opp_freq;
69
Nishanth Menon78e8eb82013-01-18 19:52:33 +000070 rcu_read_lock();
Nishanth Menon5d4879c2013-09-19 16:03:50 -050071 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
Shawn Guo95ceafd2012-09-06 07:09:11 +000072 if (IS_ERR(opp)) {
Nishanth Menon78e8eb82013-01-18 19:52:33 +000073 rcu_read_unlock();
Viresh Kumarfbd48ca2014-08-28 11:22:27 +053074 dev_err(cpu_dev, "failed to find OPP for %ld\n",
75 freq_Hz);
Viresh Kumard4019f02013-08-14 19:38:24 +053076 return PTR_ERR(opp);
Shawn Guo95ceafd2012-09-06 07:09:11 +000077 }
Nishanth Menon5d4879c2013-09-19 16:03:50 -050078 volt = dev_pm_opp_get_voltage(opp);
Stefan Wahren0a1e8792014-10-17 22:09:48 +000079 opp_freq = dev_pm_opp_get_freq(opp);
Nishanth Menon78e8eb82013-01-18 19:52:33 +000080 rcu_read_unlock();
Viresh Kumard2f31f12014-08-28 11:22:28 +053081 tol = volt * priv->voltage_tolerance / 100;
Shawn Guo95ceafd2012-09-06 07:09:11 +000082 volt_old = regulator_get_voltage(cpu_reg);
Stefan Wahren0a1e8792014-10-17 22:09:48 +000083 dev_dbg(cpu_dev, "Found OPP: %ld kHz, %ld uV\n",
84 opp_freq / 1000, volt);
Shawn Guo95ceafd2012-09-06 07:09:11 +000085 }
86
Andrzej Hajda929ca892015-12-30 12:18:42 +010087 dev_dbg(cpu_dev, "%u MHz, %d mV --> %u MHz, %ld mV\n",
Stefan Wahren8197bb12014-10-17 22:09:49 +000088 old_freq / 1000, (volt_old > 0) ? volt_old / 1000 : -1,
Viresh Kumarfbd48ca2014-08-28 11:22:27 +053089 new_freq / 1000, volt ? volt / 1000 : -1);
Shawn Guo95ceafd2012-09-06 07:09:11 +000090
91 /* scaling up? scale voltage before frequency */
Viresh Kumard4019f02013-08-14 19:38:24 +053092 if (!IS_ERR(cpu_reg) && new_freq > old_freq) {
Shawn Guo95ceafd2012-09-06 07:09:11 +000093 ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
94 if (ret) {
Viresh Kumarfbd48ca2014-08-28 11:22:27 +053095 dev_err(cpu_dev, "failed to scale voltage up: %d\n",
96 ret);
Viresh Kumard4019f02013-08-14 19:38:24 +053097 return ret;
Shawn Guo95ceafd2012-09-06 07:09:11 +000098 }
99 }
100
Guennadi Liakhovetski0ca68432013-02-25 18:22:37 +0100101 ret = clk_set_rate(cpu_clk, freq_exact);
Shawn Guo95ceafd2012-09-06 07:09:11 +0000102 if (ret) {
Viresh Kumarfbd48ca2014-08-28 11:22:27 +0530103 dev_err(cpu_dev, "failed to set clock rate: %d\n", ret);
Stefan Wahren8197bb12014-10-17 22:09:49 +0000104 if (!IS_ERR(cpu_reg) && volt_old > 0)
Shawn Guo95ceafd2012-09-06 07:09:11 +0000105 regulator_set_voltage_tol(cpu_reg, volt_old, tol);
Viresh Kumard4019f02013-08-14 19:38:24 +0530106 return ret;
Shawn Guo95ceafd2012-09-06 07:09:11 +0000107 }
108
109 /* scaling down? scale voltage after frequency */
Viresh Kumard4019f02013-08-14 19:38:24 +0530110 if (!IS_ERR(cpu_reg) && new_freq < old_freq) {
Shawn Guo95ceafd2012-09-06 07:09:11 +0000111 ret = regulator_set_voltage_tol(cpu_reg, volt, tol);
112 if (ret) {
Viresh Kumarfbd48ca2014-08-28 11:22:27 +0530113 dev_err(cpu_dev, "failed to scale voltage down: %d\n",
114 ret);
Viresh Kumard4019f02013-08-14 19:38:24 +0530115 clk_set_rate(cpu_clk, old_freq * 1000);
Shawn Guo95ceafd2012-09-06 07:09:11 +0000116 }
117 }
118
Viresh Kumarfd143b42013-04-01 12:57:44 +0000119 return ret;
Shawn Guo95ceafd2012-09-06 07:09:11 +0000120}
121
Viresh Kumar95b61052014-08-28 11:22:30 +0530122static int allocate_resources(int cpu, struct device **cdev,
Viresh Kumard2f31f12014-08-28 11:22:28 +0530123 struct regulator **creg, struct clk **cclk)
Shawn Guo95ceafd2012-09-06 07:09:11 +0000124{
Viresh Kumard2f31f12014-08-28 11:22:28 +0530125 struct device *cpu_dev;
126 struct regulator *cpu_reg;
127 struct clk *cpu_clk;
128 int ret = 0;
Viresh Kumar2d2c5e02014-08-28 11:22:29 +0530129 char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
Shawn Guo95ceafd2012-09-06 07:09:11 +0000130
Viresh Kumar95b61052014-08-28 11:22:30 +0530131 cpu_dev = get_cpu_device(cpu);
Sudeep KarkadaNageshae1825b22013-09-10 18:59:46 +0100132 if (!cpu_dev) {
Viresh Kumar95b61052014-08-28 11:22:30 +0530133 pr_err("failed to get cpu%d device\n", cpu);
Sudeep KarkadaNageshae1825b22013-09-10 18:59:46 +0100134 return -ENODEV;
135 }
Paolo Pisatif5c3ef22013-03-28 09:24:29 +0000136
Viresh Kumar2d2c5e02014-08-28 11:22:29 +0530137 /* Try "cpu0" for older DTs */
Viresh Kumar95b61052014-08-28 11:22:30 +0530138 if (!cpu)
139 reg = reg_cpu0;
140 else
141 reg = reg_cpu;
Viresh Kumar2d2c5e02014-08-28 11:22:29 +0530142
143try_again:
144 cpu_reg = regulator_get_optional(cpu_dev, reg);
Arnd Bergmannb331bc22016-01-25 16:45:48 +0100145 ret = PTR_ERR_OR_ZERO(cpu_reg);
146 if (ret) {
Nishanth Menonfc31d6f2013-05-01 13:38:12 +0000147 /*
Viresh Kumar95b61052014-08-28 11:22:30 +0530148 * If cpu's regulator supply node is present, but regulator is
Nishanth Menonfc31d6f2013-05-01 13:38:12 +0000149 * not yet registered, we should try defering probe.
150 */
Arnd Bergmannb331bc22016-01-25 16:45:48 +0100151 if (ret == -EPROBE_DEFER) {
Viresh Kumar95b61052014-08-28 11:22:30 +0530152 dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n",
153 cpu);
Arnd Bergmannb331bc22016-01-25 16:45:48 +0100154 return ret;
Nishanth Menonfc31d6f2013-05-01 13:38:12 +0000155 }
Viresh Kumar2d2c5e02014-08-28 11:22:29 +0530156
157 /* Try with "cpu-supply" */
158 if (reg == reg_cpu0) {
159 reg = reg_cpu;
160 goto try_again;
161 }
162
Arnd Bergmannb331bc22016-01-25 16:45:48 +0100163 dev_dbg(cpu_dev, "no regulator for cpu%d: %d\n", cpu, ret);
Nishanth Menonfc31d6f2013-05-01 13:38:12 +0000164 }
165
Lucas Stache3beb0a2014-05-16 12:20:42 +0200166 cpu_clk = clk_get(cpu_dev, NULL);
Arnd Bergmannb331bc22016-01-25 16:45:48 +0100167 ret = PTR_ERR_OR_ZERO(cpu_clk);
168 if (ret) {
Viresh Kumard2f31f12014-08-28 11:22:28 +0530169 /* put regulator */
170 if (!IS_ERR(cpu_reg))
171 regulator_put(cpu_reg);
172
Viresh Kumar48a86242014-08-28 11:22:26 +0530173 /*
174 * If cpu's clk node is present, but clock is not yet
175 * registered, we should try defering probe.
176 */
177 if (ret == -EPROBE_DEFER)
Viresh Kumar95b61052014-08-28 11:22:30 +0530178 dev_dbg(cpu_dev, "cpu%d clock not ready, retry\n", cpu);
Viresh Kumar48a86242014-08-28 11:22:26 +0530179 else
Abhilash Kesavan71796212014-10-31 18:09:33 +0530180 dev_err(cpu_dev, "failed to get cpu%d clock: %d\n", cpu,
181 ret);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530182 } else {
183 *cdev = cpu_dev;
184 *creg = cpu_reg;
185 *cclk = cpu_clk;
186 }
Viresh Kumar48a86242014-08-28 11:22:26 +0530187
Viresh Kumard2f31f12014-08-28 11:22:28 +0530188 return ret;
189}
190
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530191static int cpufreq_init(struct cpufreq_policy *policy)
Viresh Kumard2f31f12014-08-28 11:22:28 +0530192{
193 struct cpufreq_frequency_table *freq_table;
Viresh Kumard2f31f12014-08-28 11:22:28 +0530194 struct device_node *np;
195 struct private_data *priv;
196 struct device *cpu_dev;
197 struct regulator *cpu_reg;
198 struct clk *cpu_clk;
Bartlomiej Zolnierkiewicz953ba9f2015-09-08 18:41:03 +0200199 struct dev_pm_opp *suspend_opp;
Lucas Stach045ee452014-10-24 15:05:55 +0200200 unsigned long min_uV = ~0, max_uV = 0;
Viresh Kumard2f31f12014-08-28 11:22:28 +0530201 unsigned int transition_latency;
Viresh Kumar2e02d872015-07-29 16:23:10 +0530202 bool need_update = false;
Viresh Kumard2f31f12014-08-28 11:22:28 +0530203 int ret;
204
Viresh Kumar95b61052014-08-28 11:22:30 +0530205 ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530206 if (ret) {
Geert Uytterhoevenedd52b12014-10-23 11:52:54 +0200207 pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530208 return ret;
209 }
210
211 np = of_node_get(cpu_dev->of_node);
212 if (!np) {
213 dev_err(cpu_dev, "failed to find cpu%d node\n", policy->cpu);
214 ret = -ENOENT;
215 goto out_put_reg_clk;
Shawn Guo95ceafd2012-09-06 07:09:11 +0000216 }
217
Viresh Kumar2e02d872015-07-29 16:23:10 +0530218 /* Get OPP-sharing information from "operating-points-v2" bindings */
Viresh Kumar8f8d37b2015-09-04 13:47:24 +0530219 ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, policy->cpus);
Viresh Kumar2e02d872015-07-29 16:23:10 +0530220 if (ret) {
221 /*
222 * operating-points-v2 not supported, fallback to old method of
223 * finding shared-OPPs for backward compatibility.
224 */
225 if (ret == -ENOENT)
226 need_update = true;
227 else
228 goto out_node_put;
229 }
230
231 /*
232 * Initialize OPP tables for all policy->cpus. They will be shared by
233 * all CPUs which have marked their CPUs shared with OPP bindings.
234 *
235 * For platforms not using operating-points-v2 bindings, we do this
236 * before updating policy->cpus. Otherwise, we will end up creating
237 * duplicate OPPs for policy->cpus.
238 *
239 * OPPs might be populated at runtime, don't check for error here
240 */
Viresh Kumar8f8d37b2015-09-04 13:47:24 +0530241 dev_pm_opp_of_cpumask_add_table(policy->cpus);
Viresh Kumar2e02d872015-07-29 16:23:10 +0530242
Viresh Kumar7d5d0c82015-09-02 14:36:48 +0530243 /*
244 * But we need OPP table to function so if it is not there let's
245 * give platform code chance to provide it for us.
246 */
247 ret = dev_pm_opp_get_opp_count(cpu_dev);
248 if (ret <= 0) {
249 pr_debug("OPP table is not ready, deferring probe\n");
250 ret = -EPROBE_DEFER;
251 goto out_free_opp;
252 }
253
Viresh Kumar2e02d872015-07-29 16:23:10 +0530254 if (need_update) {
255 struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data();
256
257 if (!pd || !pd->independent_clocks)
258 cpumask_setall(policy->cpus);
259
260 /*
261 * OPP tables are initialized only for policy->cpu, do it for
262 * others as well.
263 */
Viresh Kumar8f8d37b2015-09-04 13:47:24 +0530264 ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
Viresh Kumar8bc86282015-09-02 14:36:49 +0530265 if (ret)
266 dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
267 __func__, ret);
Viresh Kumar2e02d872015-07-29 16:23:10 +0530268
269 of_property_read_u32(np, "clock-latency", &transition_latency);
270 } else {
271 transition_latency = dev_pm_opp_get_max_clock_latency(cpu_dev);
272 }
Shawn Guo95ceafd2012-09-06 07:09:11 +0000273
Viresh Kumard2f31f12014-08-28 11:22:28 +0530274 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
275 if (!priv) {
276 ret = -ENOMEM;
Viresh Kumar2f0f6092014-11-25 16:04:21 +0530277 goto out_free_opp;
Viresh Kumard2f31f12014-08-28 11:22:28 +0530278 }
279
280 of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance);
Shawn Guo95ceafd2012-09-06 07:09:11 +0000281
Viresh Kumar2e02d872015-07-29 16:23:10 +0530282 if (!transition_latency)
Shawn Guo95ceafd2012-09-06 07:09:11 +0000283 transition_latency = CPUFREQ_ETERNAL;
284
Philipp Zabel43c638e2013-09-26 11:19:37 +0200285 if (!IS_ERR(cpu_reg)) {
Lucas Stach045ee452014-10-24 15:05:55 +0200286 unsigned long opp_freq = 0;
Shawn Guo95ceafd2012-09-06 07:09:11 +0000287
288 /*
Lucas Stach045ee452014-10-24 15:05:55 +0200289 * Disable any OPPs where the connected regulator isn't able to
290 * provide the specified voltage and record minimum and maximum
291 * voltage levels.
Shawn Guo95ceafd2012-09-06 07:09:11 +0000292 */
Lucas Stach045ee452014-10-24 15:05:55 +0200293 while (1) {
294 struct dev_pm_opp *opp;
295 unsigned long opp_uV, tol_uV;
296
297 rcu_read_lock();
298 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &opp_freq);
299 if (IS_ERR(opp)) {
300 rcu_read_unlock();
301 break;
302 }
303 opp_uV = dev_pm_opp_get_voltage(opp);
304 rcu_read_unlock();
305
306 tol_uV = opp_uV * priv->voltage_tolerance / 100;
Viresh Kumara2022002015-09-02 14:36:50 +0530307 if (regulator_is_supported_voltage(cpu_reg,
308 opp_uV - tol_uV,
Lucas Stach045ee452014-10-24 15:05:55 +0200309 opp_uV + tol_uV)) {
310 if (opp_uV < min_uV)
311 min_uV = opp_uV;
312 if (opp_uV > max_uV)
313 max_uV = opp_uV;
314 } else {
315 dev_pm_opp_disable(cpu_dev, opp_freq);
316 }
317
318 opp_freq++;
319 }
320
Shawn Guo95ceafd2012-09-06 07:09:11 +0000321 ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV);
322 if (ret > 0)
323 transition_latency += ret * 1000;
324 }
325
Lucas Stach045ee452014-10-24 15:05:55 +0200326 ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
327 if (ret) {
328 pr_err("failed to init cpufreq table: %d\n", ret);
329 goto out_free_priv;
330 }
331
Viresh Kumard2f31f12014-08-28 11:22:28 +0530332 priv->cpu_dev = cpu_dev;
333 priv->cpu_reg = cpu_reg;
334 policy->driver_data = priv;
335
336 policy->clk = cpu_clk;
Bartlomiej Zolnierkiewicz953ba9f2015-09-08 18:41:03 +0200337
338 rcu_read_lock();
339 suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
340 if (suspend_opp)
341 policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
342 rcu_read_unlock();
343
Thomas Petazzoni34e5a522014-10-19 11:30:28 +0200344 ret = cpufreq_table_validate_and_show(policy, freq_table);
345 if (ret) {
346 dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
347 ret);
Viresh Kumar9a004422014-11-27 06:07:52 +0530348 goto out_free_cpufreq_table;
Thomas Petazzoni34e5a522014-10-19 11:30:28 +0200349 }
350
Viresh Kumard15fa862015-07-29 16:23:11 +0530351 /* Support turbo/boost mode */
352 if (policy_has_boost_freq(policy)) {
353 /* This gets disabled by core on driver unregister */
354 ret = cpufreq_enable_boost_support();
355 if (ret)
356 goto out_free_cpufreq_table;
Bartlomiej Zolnierkiewicz21c36d32015-08-07 13:59:16 +0200357 cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
Viresh Kumard15fa862015-07-29 16:23:11 +0530358 }
359
Thomas Petazzoni34e5a522014-10-19 11:30:28 +0200360 policy->cpuinfo.transition_latency = transition_latency;
361
Lucas Stachf9739d22014-09-26 15:33:46 +0200362 of_node_put(np);
363
Shawn Guo95ceafd2012-09-06 07:09:11 +0000364 return 0;
365
Viresh Kumar9a004422014-11-27 06:07:52 +0530366out_free_cpufreq_table:
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500367 dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
Lucas Stach045ee452014-10-24 15:05:55 +0200368out_free_priv:
369 kfree(priv);
Viresh Kumar2f0f6092014-11-25 16:04:21 +0530370out_free_opp:
Viresh Kumar8f8d37b2015-09-04 13:47:24 +0530371 dev_pm_opp_of_cpumask_remove_table(policy->cpus);
Viresh Kumar2e02d872015-07-29 16:23:10 +0530372out_node_put:
Shawn Guo95ceafd2012-09-06 07:09:11 +0000373 of_node_put(np);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530374out_put_reg_clk:
375 clk_put(cpu_clk);
376 if (!IS_ERR(cpu_reg))
377 regulator_put(cpu_reg);
378
379 return ret;
380}
381
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530382static int cpufreq_exit(struct cpufreq_policy *policy)
Viresh Kumard2f31f12014-08-28 11:22:28 +0530383{
384 struct private_data *priv = policy->driver_data;
385
Markus Elfring17ad13b2015-02-03 19:21:21 +0100386 cpufreq_cooling_unregister(priv->cdev);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530387 dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
Viresh Kumar8f8d37b2015-09-04 13:47:24 +0530388 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530389 clk_put(policy->clk);
390 if (!IS_ERR(priv->cpu_reg))
391 regulator_put(priv->cpu_reg);
392 kfree(priv);
393
394 return 0;
395}
396
Viresh Kumar9a004422014-11-27 06:07:52 +0530397static void cpufreq_ready(struct cpufreq_policy *policy)
398{
399 struct private_data *priv = policy->driver_data;
400 struct device_node *np = of_node_get(priv->cpu_dev->of_node);
401
402 if (WARN_ON(!np))
403 return;
404
405 /*
406 * For now, just loading the cooling device;
407 * thermal DT code takes care of matching them.
408 */
409 if (of_find_property(np, "#cooling-cells", NULL)) {
Punit Agrawalf8fa8ae2015-11-17 12:06:22 +0000410 u32 power_coefficient = 0;
411
412 of_property_read_u32(np, "dynamic-power-coefficient",
413 &power_coefficient);
414
415 priv->cdev = of_cpufreq_power_cooling_register(np,
416 policy->related_cpus, power_coefficient, NULL);
Viresh Kumar9a004422014-11-27 06:07:52 +0530417 if (IS_ERR(priv->cdev)) {
418 dev_err(priv->cpu_dev,
419 "running cpufreq without cooling device: %ld\n",
420 PTR_ERR(priv->cdev));
421
422 priv->cdev = NULL;
423 }
424 }
425
426 of_node_put(np);
427}
428
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530429static struct cpufreq_driver dt_cpufreq_driver = {
Viresh Kumard2f31f12014-08-28 11:22:28 +0530430 .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
431 .verify = cpufreq_generic_frequency_table_verify,
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530432 .target_index = set_target,
Viresh Kumard2f31f12014-08-28 11:22:28 +0530433 .get = cpufreq_generic_get,
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530434 .init = cpufreq_init,
435 .exit = cpufreq_exit,
Viresh Kumar9a004422014-11-27 06:07:52 +0530436 .ready = cpufreq_ready,
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530437 .name = "cpufreq-dt",
Bartlomiej Zolnierkiewicz21c36d32015-08-07 13:59:16 +0200438 .attr = cpufreq_dt_attr,
Bartlomiej Zolnierkiewicz953ba9f2015-09-08 18:41:03 +0200439 .suspend = cpufreq_generic_suspend,
Viresh Kumard2f31f12014-08-28 11:22:28 +0530440};
441
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530442static int dt_cpufreq_probe(struct platform_device *pdev)
Viresh Kumard2f31f12014-08-28 11:22:28 +0530443{
444 struct device *cpu_dev;
445 struct regulator *cpu_reg;
446 struct clk *cpu_clk;
447 int ret;
448
449 /*
450 * All per-cluster (CPUs sharing clock/voltages) initialization is done
451 * from ->init(). In probe(), we just need to make sure that clk and
452 * regulators are available. Else defer probe and retry.
453 *
454 * FIXME: Is checking this only for CPU0 sufficient ?
455 */
Viresh Kumar95b61052014-08-28 11:22:30 +0530456 ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530457 if (ret)
458 return ret;
459
460 clk_put(cpu_clk);
461 if (!IS_ERR(cpu_reg))
462 regulator_put(cpu_reg);
463
Thomas Petazzoni34e5a522014-10-19 11:30:28 +0200464 dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
465
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530466 ret = cpufreq_register_driver(&dt_cpufreq_driver);
Viresh Kumard2f31f12014-08-28 11:22:28 +0530467 if (ret)
468 dev_err(cpu_dev, "failed register driver: %d\n", ret);
469
Shawn Guo95ceafd2012-09-06 07:09:11 +0000470 return ret;
471}
Shawn Guo5553f9e2013-01-30 14:27:49 +0000472
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530473static int dt_cpufreq_remove(struct platform_device *pdev)
Shawn Guo5553f9e2013-01-30 14:27:49 +0000474{
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530475 cpufreq_unregister_driver(&dt_cpufreq_driver);
Shawn Guo5553f9e2013-01-30 14:27:49 +0000476 return 0;
477}
478
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530479static struct platform_driver dt_cpufreq_platdrv = {
Shawn Guo5553f9e2013-01-30 14:27:49 +0000480 .driver = {
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530481 .name = "cpufreq-dt",
Shawn Guo5553f9e2013-01-30 14:27:49 +0000482 },
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530483 .probe = dt_cpufreq_probe,
484 .remove = dt_cpufreq_remove,
Shawn Guo5553f9e2013-01-30 14:27:49 +0000485};
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530486module_platform_driver(dt_cpufreq_platdrv);
Shawn Guo95ceafd2012-09-06 07:09:11 +0000487
Felipe Balbi07949bf2015-05-08 14:57:30 -0500488MODULE_ALIAS("platform:cpufreq-dt");
Viresh Kumar748c8762014-08-28 11:22:24 +0530489MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
Shawn Guo95ceafd2012-09-06 07:09:11 +0000490MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
Viresh Kumarbbcf0712014-09-09 19:58:03 +0530491MODULE_DESCRIPTION("Generic cpufreq driver");
Shawn Guo95ceafd2012-09-06 07:09:11 +0000492MODULE_LICENSE("GPL");