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>
39 #define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
40 #define FREQ_LOG(fmt, args...) pr_debug(fmt, ## args)
42 #define FREQ_DBG(fmt, args...) do {} while(0)
43 #define FREQ_LOG(fmt, args...) do {} while(0)
45 #define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
47 /* Frequency table index must be sequential starting at 0 */
48 static struct cpufreq_frequency_table default_freq_table[] = {
49 {.frequency = 312 * 1000, .index = 875 * 1000},
50 {.frequency = 504 * 1000, .index = 925 * 1000},
51 {.frequency = 816 * 1000, .index = 975 * 1000},
52 {.frequency = 1008 * 1000, .index = 1075 * 1000},
53 {.frequency = 1200 * 1000, .index = 1150 * 1000},
54 {.frequency = 1416 * 1000, .index = 1250 * 1000},
55 {.frequency = 1608 * 1000, .index = 1350 * 1000},
56 {.frequency = CPUFREQ_TABLE_END},
58 static struct cpufreq_frequency_table *freq_table = default_freq_table;
59 /*********************************************************/
60 /* additional symantics for "relation" in cpufreq with pm */
61 #define DISABLE_FURTHER_CPUFREQ 0x10
62 #define ENABLE_FURTHER_CPUFREQ 0x20
63 #define MASK_FURTHER_CPUFREQ 0x30
64 /* With 0x00(NOCHANGE), it depends on the previous "further" status */
65 #define CPUFREQ_PRIVATE 0x100
66 static int no_cpufreq_access;
67 static unsigned int suspend_freq = 816 * 1000;
68 static unsigned int suspend_volt = 1000000; // 1V
69 static unsigned int low_battery_freq = 600 * 1000;
70 static unsigned int low_battery_capacity = 5; // 5%
71 static bool is_booting = true;
72 static DEFINE_MUTEX(cpufreq_mutex);
73 static bool gpu_is_mali400;
74 struct dvfs_node *clk_cpu_dvfs_node = NULL;
75 struct dvfs_node *clk_gpu_dvfs_node = NULL;
76 struct dvfs_node *clk_vepu_dvfs_node = NULL;
77 struct dvfs_node *clk_ddr_dvfs_node = NULL;
78 /*******************************************************/
79 static unsigned int cpufreq_get_rate(unsigned int cpu)
81 if (clk_cpu_dvfs_node)
82 return clk_get_rate(clk_cpu_dvfs_node->clk) / 1000;
87 static bool cpufreq_is_ondemand(struct cpufreq_policy *policy)
90 if (policy && policy->governor)
91 c = policy->governor->name[0];
92 return (c == 'o' || c == 'i' || c == 'c' || c == 'h');
95 static unsigned int get_freq_from_table(unsigned int max_freq)
98 unsigned int target_freq = 0;
99 for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
100 unsigned int freq = freq_table[i].frequency;
101 if (freq <= max_freq && target_freq < freq) {
106 target_freq = max_freq;
110 static int cpufreq_notifier_policy(struct notifier_block *nb, unsigned long val, void *data)
112 struct cpufreq_policy *policy = data;
114 if (val != CPUFREQ_ADJUST)
117 if (cpufreq_is_ondemand(policy)) {
118 FREQ_DBG("queue work\n");
119 dvfs_clk_enable_limit(clk_cpu_dvfs_node, 0, ~0);
121 FREQ_DBG("cancel work\n");
122 dvfs_clk_disable_limit(clk_cpu_dvfs_node);
128 static struct notifier_block notifier_policy_block = {
129 .notifier_call = cpufreq_notifier_policy
132 static int cpufreq_verify(struct cpufreq_policy *policy)
136 return cpufreq_frequency_table_verify(policy, freq_table);
139 static int cpufreq_scale_rate_for_dvfs(struct clk *clk, unsigned long rate)
142 struct cpufreq_freqs freqs;
143 struct cpufreq_policy *policy;
145 freqs.new = rate / 1000;
146 freqs.old = clk_get_rate(clk) / 1000;
148 for_each_online_cpu(freqs.cpu) {
149 policy = cpufreq_cpu_get(freqs.cpu);
150 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
151 cpufreq_cpu_put(policy);
154 FREQ_DBG("cpufreq_scale_rate_for_dvfs(%lu)\n", rate);
156 ret = clk_set_rate(clk, rate);
158 freqs.new = clk_get_rate(clk) / 1000;
160 for_each_online_cpu(freqs.cpu) {
161 policy = cpufreq_cpu_get(freqs.cpu);
162 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
163 cpufreq_cpu_put(policy);
170 static int cpufreq_init_cpu0(struct cpufreq_policy *policy)
173 gpu_is_mali400 = cpu_is_rk3188();
175 clk_gpu_dvfs_node = clk_get_dvfs_node("clk_gpu");
176 if (clk_gpu_dvfs_node){
177 clk_enable_dvfs(clk_gpu_dvfs_node);
179 dvfs_clk_enable_limit(clk_gpu_dvfs_node, 133000000, 600000000);
182 clk_vepu_dvfs_node = clk_get_dvfs_node("clk_vepu");
183 if (clk_vepu_dvfs_node){
184 clk_enable_dvfs(clk_vepu_dvfs_node);
187 clk_ddr_dvfs_node = clk_get_dvfs_node("clk_ddr");
188 if (clk_ddr_dvfs_node){
189 clk_enable_dvfs(clk_ddr_dvfs_node);
192 clk_cpu_dvfs_node = clk_get_dvfs_node("clk_core");
193 if (!clk_cpu_dvfs_node){
196 dvfs_clk_register_set_rate_callback(clk_cpu_dvfs_node, cpufreq_scale_rate_for_dvfs);
197 freq_table = dvfs_get_freq_volt_table(clk_cpu_dvfs_node);
198 if (freq_table == NULL) {
199 freq_table = default_freq_table;
202 for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
203 if (freq_table[i].index >= suspend_volt && v > freq_table[i].index) {
204 suspend_freq = freq_table[i].frequency;
205 v = freq_table[i].index;
209 low_battery_freq = get_freq_from_table(low_battery_freq);
210 clk_enable_dvfs(clk_cpu_dvfs_node);
212 cpufreq_register_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER);
214 printk("cpufreq version " VERSION ", suspend freq %d MHz\n", suspend_freq / 1000);
218 static int cpufreq_init(struct cpufreq_policy *policy)
222 if (policy->cpu == 0) {
223 cpu0_err = cpufreq_init_cpu0(policy);
230 cpufreq_frequency_table_cpuinfo(policy, freq_table);
232 cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
235 policy->cur = clk_get_rate(clk_cpu_dvfs_node->clk) / 1000;
237 policy->cpuinfo.transition_latency = 40 * NSEC_PER_USEC; // make ondemand default sampling_rate to 40000
240 * On SMP configuartion, both processors share the voltage
241 * and clock. So both CPUs needs to be scaled together and hence
242 * needs software co-ordination. Use cpufreq affected_cpus
243 * interface to handle this scenario. Additional is_smp() check
244 * is to keep SMP_ON_UP build working.
247 cpumask_setall(policy->cpus);
253 static int cpufreq_exit(struct cpufreq_policy *policy)
255 if (policy->cpu != 0)
258 cpufreq_frequency_table_cpuinfo(policy, freq_table);
259 clk_put_dvfs_node(clk_cpu_dvfs_node);
260 cpufreq_unregister_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER);
265 static struct freq_attr *cpufreq_attr[] = {
266 &cpufreq_freq_attr_scaling_available_freqs,
270 #ifdef CONFIG_CHARGER_DISPLAY
271 extern int rk_get_system_battery_capacity(void);
273 static int rk_get_system_battery_capacity(void) { return 100; }
276 static unsigned int cpufreq_scale_limit(unsigned int target_freq, struct cpufreq_policy *policy, bool is_private)
278 bool is_ondemand = cpufreq_is_ondemand(policy);
284 s64 boottime_ms = ktime_to_ms(ktime_get_boottime());
285 if (boottime_ms > 60 * MSEC_PER_SEC) {
287 } else if (target_freq > low_battery_freq &&
288 rk_get_system_battery_capacity() <= low_battery_capacity) {
289 target_freq = low_battery_freq;
296 static int cpufreq_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation)
298 unsigned int i, new_freq = target_freq, new_rate, cur_rate;
303 FREQ_ERR("no freq table!\n");
307 mutex_lock(&cpufreq_mutex);
309 is_private = relation & CPUFREQ_PRIVATE;
310 relation &= ~CPUFREQ_PRIVATE;
312 if (relation & ENABLE_FURTHER_CPUFREQ)
314 if (no_cpufreq_access) {
315 FREQ_LOG("denied access to %s as it is disabled temporarily\n", __func__);
319 if (relation & DISABLE_FURTHER_CPUFREQ)
321 relation &= ~MASK_FURTHER_CPUFREQ;
323 ret = cpufreq_frequency_table_target(policy, freq_table, target_freq, relation, &i);
325 FREQ_ERR("no freq match for %d(ret=%d)\n", target_freq, ret);
328 new_freq = freq_table[i].frequency;
329 if (!no_cpufreq_access)
330 new_freq = cpufreq_scale_limit(new_freq, policy, is_private);
332 new_rate = new_freq * 1000;
333 cur_rate = dvfs_clk_get_rate(clk_cpu_dvfs_node);
334 FREQ_LOG("req = %7u new = %7u (was = %7u)\n", target_freq, new_freq, cur_rate / 1000);
335 if (new_rate == cur_rate)
337 ret = dvfs_clk_set_rate(clk_cpu_dvfs_node, new_rate);
340 FREQ_DBG("set freq (%7u) end, ret %d\n", new_freq, ret);
341 mutex_unlock(&cpufreq_mutex);
346 static int cpufreq_pm_notifier_event(struct notifier_block *this, unsigned long event, void *ptr)
348 int ret = NOTIFY_DONE;
349 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
354 if (!cpufreq_is_ondemand(policy))
358 case PM_SUSPEND_PREPARE:
359 ret = cpufreq_driver_target(policy, suspend_freq, DISABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
366 case PM_POST_RESTORE:
367 case PM_POST_SUSPEND:
368 cpufreq_driver_target(policy, suspend_freq, ENABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
373 cpufreq_cpu_put(policy);
377 static struct notifier_block cpufreq_pm_notifier = {
378 .notifier_call = cpufreq_pm_notifier_event,
381 static int cpufreq_reboot_notifier_event(struct notifier_block *this, unsigned long event, void *ptr)
383 struct cpufreq_policy *policy = cpufreq_cpu_get(0);
387 cpufreq_driver_target(policy, suspend_freq, DISABLE_FURTHER_CPUFREQ | CPUFREQ_RELATION_H);
388 cpufreq_cpu_put(policy);
394 static struct notifier_block cpufreq_reboot_notifier = {
395 .notifier_call = cpufreq_reboot_notifier_event,
398 static struct cpufreq_driver cpufreq_driver = {
399 .flags = CPUFREQ_CONST_LOOPS,
400 .verify = cpufreq_verify,
401 .target = cpufreq_target,
402 .get = cpufreq_get_rate,
403 .init = cpufreq_init,
404 .exit = cpufreq_exit,
406 .attr = cpufreq_attr,
409 static int __init cpufreq_driver_init(void)
411 register_pm_notifier(&cpufreq_pm_notifier);
412 register_reboot_notifier(&cpufreq_reboot_notifier);
413 return cpufreq_register_driver(&cpufreq_driver);
416 device_initcall(cpufreq_driver_init);