2 * Copyright (C) 2013 ROCKCHIP, Inc.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #define pr_fmt(fmt) "cpufreq: " fmt
15 #include <linux/clk.h>
16 #include <linux/cpufreq.h>
17 #include <linux/err.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/init.h>
20 #include <linux/reboot.h>
21 #include <linux/suspend.h>
22 #include <linux/tick.h>
23 #include <linux/workqueue.h>
24 #include <linux/delay.h>
25 #include <linux/regulator/consumer.h>
27 #include <linux/miscdevice.h>
28 #include <linux/string.h>
29 #include <linux/rockchip/cpu.h>
30 #include <linux/rockchip/dvfs.h>
31 #include <asm/smp_plat.h>
33 #include <asm/unistd.h>
34 #include <asm/uaccess.h>
36 extern void dvfs_disable_temp_limit(void);
41 #define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
42 #define FREQ_LOG(fmt, args...) pr_debug(fmt, ## args)
44 #define FREQ_DBG(fmt, args...) do {} while(0)
45 #define FREQ_LOG(fmt, args...) do {} while(0)
47 #define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
49 /* Frequency table index must be sequential starting at 0 */
50 static struct cpufreq_frequency_table default_freq_table[] = {
51 {.frequency = 312 * 1000, .index = 875 * 1000},
52 {.frequency = 504 * 1000, .index = 925 * 1000},
53 {.frequency = 816 * 1000, .index = 975 * 1000},
54 {.frequency = 1008 * 1000, .index = 1075 * 1000},
55 {.frequency = 1200 * 1000, .index = 1150 * 1000},
56 {.frequency = 1416 * 1000, .index = 1250 * 1000},
57 {.frequency = 1608 * 1000, .index = 1350 * 1000},
58 {.frequency = CPUFREQ_TABLE_END},
60 static struct cpufreq_frequency_table *freq_table = default_freq_table;
61 /*********************************************************/
62 /* additional symantics for "relation" in cpufreq with pm */
63 #define DISABLE_FURTHER_CPUFREQ 0x10
64 #define ENABLE_FURTHER_CPUFREQ 0x20
65 #define MASK_FURTHER_CPUFREQ 0x30
66 /* With 0x00(NOCHANGE), it depends on the previous "further" status */
67 #define CPUFREQ_PRIVATE 0x100
68 static unsigned int no_cpufreq_access = 0;
69 static unsigned int suspend_freq = 816 * 1000;
70 static unsigned int suspend_volt = 1000000; // 1V
71 static unsigned int low_battery_freq = 600 * 1000;
72 static unsigned int low_battery_capacity = 5; // 5%
73 static bool is_booting = true;
74 static DEFINE_MUTEX(cpufreq_mutex);
75 static bool gpu_is_mali400;
76 struct dvfs_node *clk_cpu_dvfs_node = NULL;
77 struct dvfs_node *clk_gpu_dvfs_node = NULL;
78 struct dvfs_node *clk_vepu_dvfs_node = NULL;
79 struct dvfs_node *clk_ddr_dvfs_node = NULL;
80 /*******************************************************/
81 static unsigned int cpufreq_get_rate(unsigned int cpu)
83 if (clk_cpu_dvfs_node)
84 return clk_get_rate(clk_cpu_dvfs_node->clk) / 1000;
89 static bool cpufreq_is_ondemand(struct cpufreq_policy *policy)
92 if (policy && policy->governor)
93 c = policy->governor->name[0];
94 return (c == 'o' || c == 'i' || c == 'c' || c == 'h');
97 static unsigned int get_freq_from_table(unsigned int max_freq)
100 unsigned int target_freq = 0;
101 for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
102 unsigned int freq = freq_table[i].frequency;
103 if (freq <= max_freq && target_freq < freq) {
108 target_freq = max_freq;
112 static int cpufreq_notifier_policy(struct notifier_block *nb, unsigned long val, void *data)
114 static unsigned int min_rate=0, max_rate=-1;
115 struct cpufreq_policy *policy = data;
117 if (val != CPUFREQ_ADJUST)
120 if (cpufreq_is_ondemand(policy)) {
121 FREQ_DBG("queue work\n");
122 dvfs_clk_enable_limit(clk_cpu_dvfs_node, min_rate, max_rate);
124 FREQ_DBG("cancel work\n");
125 dvfs_clk_get_limit(clk_cpu_dvfs_node, &min_rate, &max_rate);
131 static struct notifier_block notifier_policy_block = {
132 .notifier_call = cpufreq_notifier_policy
135 static int cpufreq_verify(struct cpufreq_policy *policy)
139 return cpufreq_frequency_table_verify(policy, freq_table);
142 static int cpufreq_scale_rate_for_dvfs(struct clk *clk, unsigned long rate)
145 struct cpufreq_freqs freqs;
146 struct cpufreq_policy *policy;
148 freqs.new = rate / 1000;
149 freqs.old = clk_get_rate(clk) / 1000;
151 for_each_online_cpu(freqs.cpu) {
152 policy = cpufreq_cpu_get(freqs.cpu);
153 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
154 cpufreq_cpu_put(policy);
157 FREQ_DBG("cpufreq_scale_rate_for_dvfs(%lu)\n", rate);
159 ret = clk_set_rate(clk, rate);
161 freqs.new = clk_get_rate(clk) / 1000;
163 for_each_online_cpu(freqs.cpu) {
164 policy = cpufreq_cpu_get(freqs.cpu);
165 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
166 cpufreq_cpu_put(policy);
173 static int cpufreq_init_cpu0(struct cpufreq_policy *policy)
176 gpu_is_mali400 = cpu_is_rk3188();
178 clk_gpu_dvfs_node = clk_get_dvfs_node("clk_gpu");
179 if (clk_gpu_dvfs_node){
180 clk_enable_dvfs(clk_gpu_dvfs_node);
182 dvfs_clk_enable_limit(clk_gpu_dvfs_node, 133000000, 600000000);
185 clk_vepu_dvfs_node = clk_get_dvfs_node("clk_vepu");
186 if (clk_vepu_dvfs_node){
187 clk_enable_dvfs(clk_vepu_dvfs_node);
190 clk_ddr_dvfs_node = clk_get_dvfs_node("clk_ddr");
191 if (clk_ddr_dvfs_node){
192 clk_enable_dvfs(clk_ddr_dvfs_node);
195 clk_cpu_dvfs_node = clk_get_dvfs_node("clk_core");
196 if (!clk_cpu_dvfs_node){
199 dvfs_clk_register_set_rate_callback(clk_cpu_dvfs_node, cpufreq_scale_rate_for_dvfs);
200 freq_table = dvfs_get_freq_volt_table(clk_cpu_dvfs_node);
201 if (freq_table == NULL) {
202 freq_table = default_freq_table;
205 for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
206 if (freq_table[i].index >= suspend_volt && v > freq_table[i].index) {
207 suspend_freq = freq_table[i].frequency;
208 v = freq_table[i].index;
212 low_battery_freq = get_freq_from_table(low_battery_freq);
213 clk_enable_dvfs(clk_cpu_dvfs_node);
215 cpufreq_register_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER);
217 printk("cpufreq version " VERSION ", suspend freq %d MHz\n", suspend_freq / 1000);
221 static int cpufreq_init(struct cpufreq_policy *policy)
225 if (policy->cpu == 0) {
226 cpu0_err = cpufreq_init_cpu0(policy);
233 cpufreq_frequency_table_cpuinfo(policy, freq_table);
235 cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
238 policy->cur = clk_get_rate(clk_cpu_dvfs_node->clk) / 1000;
240 policy->cpuinfo.transition_latency = 40 * NSEC_PER_USEC; // make ondemand default sampling_rate to 40000
243 * On SMP configuartion, both processors share the voltage
244 * and clock. So both CPUs needs to be scaled together and hence
245 * needs software co-ordination. Use cpufreq affected_cpus
246 * interface to handle this scenario. Additional is_smp() check
247 * is to keep SMP_ON_UP build working.
250 cpumask_setall(policy->cpus);
256 static int cpufreq_exit(struct cpufreq_policy *policy)
258 if (policy->cpu != 0)
261 cpufreq_frequency_table_cpuinfo(policy, freq_table);
262 clk_put_dvfs_node(clk_cpu_dvfs_node);
263 cpufreq_unregister_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER);
268 static struct freq_attr *cpufreq_attr[] = {
269 &cpufreq_freq_attr_scaling_available_freqs,
273 #ifdef CONFIG_CHARGER_DISPLAY
274 extern int rk_get_system_battery_capacity(void);
276 static int rk_get_system_battery_capacity(void) { return 100; }
279 static unsigned int cpufreq_scale_limit(unsigned int target_freq, struct cpufreq_policy *policy, bool is_private)
281 bool is_ondemand = cpufreq_is_ondemand(policy);
287 s64 boottime_ms = ktime_to_ms(ktime_get_boottime());
288 if (boottime_ms > 60 * MSEC_PER_SEC) {
290 } else if (target_freq > low_battery_freq &&
291 rk_get_system_battery_capacity() <= low_battery_capacity) {
292 target_freq = low_battery_freq;
299 static int cpufreq_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation)
301 unsigned int i, new_freq = target_freq, new_rate, cur_rate;
306 FREQ_ERR("no freq table!\n");
310 mutex_lock(&cpufreq_mutex);
312 is_private = relation & CPUFREQ_PRIVATE;
313 relation &= ~CPUFREQ_PRIVATE;
315 if ((relation & ENABLE_FURTHER_CPUFREQ) && no_cpufreq_access)
317 if (no_cpufreq_access) {
318 FREQ_LOG("denied access to %s as it is disabled temporarily\n", __func__);
322 if (relation & DISABLE_FURTHER_CPUFREQ)
324 relation &= ~MASK_FURTHER_CPUFREQ;
326 ret = cpufreq_frequency_table_target(policy, freq_table, target_freq, relation, &i);
328 FREQ_ERR("no freq match for %d(ret=%d)\n", target_freq, ret);
331 new_freq = freq_table[i].frequency;
332 if (!no_cpufreq_access)
333 new_freq = cpufreq_scale_limit(new_freq, policy, is_private);
335 new_rate = new_freq * 1000;
336 cur_rate = dvfs_clk_get_rate(clk_cpu_dvfs_node);
337 FREQ_LOG("req = %7u new = %7u (was = %7u)\n", target_freq, new_freq, cur_rate / 1000);
338 if (new_rate == cur_rate)
340 ret = dvfs_clk_set_rate(clk_cpu_dvfs_node, new_rate);
343 FREQ_DBG("set freq (%7u) end, ret %d\n", new_freq, ret);
344 mutex_unlock(&cpufreq_mutex);
349 static int cpufreq_pm_notifier_event(struct notifier_block *this, unsigned long event, void *ptr)
351 int ret = NOTIFY_DONE;
352 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
357 if (!cpufreq_is_ondemand(policy))
361 case PM_SUSPEND_PREPARE:
363 ret = cpufreq_driver_target(policy, suspend_freq, DISABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
370 case PM_POST_RESTORE:
371 case PM_POST_SUSPEND:
372 //if (target_freq == policy->cur) then cpufreq_driver_target
373 //will return, and our target will not be called, it casue
374 //ENABLE_FURTHER_CPUFREQ flag invalid, avoid that.
376 cpufreq_driver_target(policy, suspend_freq, ENABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
381 cpufreq_cpu_put(policy);
385 static struct notifier_block cpufreq_pm_notifier = {
386 .notifier_call = cpufreq_pm_notifier_event,
389 static int cpufreq_reboot_notifier_event(struct notifier_block *this, unsigned long event, void *ptr)
391 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
396 cpufreq_driver_target(policy, suspend_freq, DISABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
397 cpufreq_cpu_put(policy);
403 int rockchip_cpufreq_reboot_limit_freq(void)
405 dvfs_disable_temp_limit();
406 dvfs_clk_enable_limit(clk_cpu_dvfs_node, 1000*suspend_freq, 1000*suspend_freq);
407 printk("cpufreq: reboot set core rate=%lu, volt=%d\n", dvfs_clk_get_rate(clk_cpu_dvfs_node),
408 regulator_get_voltage(clk_cpu_dvfs_node->vd->regulator));
413 static struct notifier_block cpufreq_reboot_notifier = {
414 .notifier_call = cpufreq_reboot_notifier_event,
417 static struct cpufreq_driver cpufreq_driver = {
418 .flags = CPUFREQ_CONST_LOOPS,
419 .verify = cpufreq_verify,
420 .target = cpufreq_target,
421 .get = cpufreq_get_rate,
422 .init = cpufreq_init,
423 .exit = cpufreq_exit,
425 .attr = cpufreq_attr,
428 static int __init cpufreq_driver_init(void)
430 register_pm_notifier(&cpufreq_pm_notifier);
431 //register_reboot_notifier(&cpufreq_reboot_notifier);
432 return cpufreq_register_driver(&cpufreq_driver);
435 device_initcall(cpufreq_driver_init);