2 * Copyright (C) 2015 Fuzhou Rockchip Electronics Co., Ltd
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.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/clk.h>
18 #include <linux/cpufreq.h>
19 #include <linux/err.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/init.h>
22 #include <linux/reboot.h>
23 #include <linux/suspend.h>
24 #include <linux/tick.h>
25 #include <linux/workqueue.h>
26 #include <linux/delay.h>
27 #include <linux/regulator/consumer.h>
29 #include <linux/miscdevice.h>
30 #include <linux/string.h>
31 #include <linux/rockchip/cpu.h>
32 #include <linux/rockchip/dvfs.h>
33 #include <asm/smp_plat.h>
34 #include <asm/unistd.h>
35 #include <linux/uaccess.h>
36 #include <asm/system_misc.h>
37 #include <linux/cpu.h>
39 #include <linux/mfd/syscon.h>
40 #include <linux/regmap.h>
41 #include <linux/rockchip/common.h>
42 #include <dt-bindings/clock/rk_system_status.h>
43 #include <linux/platform_device.h>
44 #include <linux/module.h>
45 #include "../../../drivers/clk/rockchip/clk-pd.h"
47 #define RK3368_GRF_CPU_CON(n) (0x500 + 4*n)
50 #define RK_MAX_CLUSTERS 2
53 #define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
54 #define FREQ_LOG(fmt, args...) pr_debug(fmt, ## args)
56 #define FREQ_DBG(fmt, args...) do {} while (0)
57 #define FREQ_LOG(fmt, args...) do {} while (0)
59 #define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
61 /* Frequency table index must be sequential starting at 0 */
62 static struct cpufreq_frequency_table default_freq_table[] = {
63 {.frequency = 312 * 1000, .index = 875 * 1000},
64 {.frequency = 504 * 1000, .index = 925 * 1000},
65 {.frequency = 816 * 1000, .index = 975 * 1000},
66 {.frequency = 1008 * 1000, .index = 1075 * 1000},
67 {.frequency = 1200 * 1000, .index = 1150 * 1000},
68 {.frequency = 1416 * 1000, .index = 1250 * 1000},
69 {.frequency = 1608 * 1000, .index = 1350 * 1000},
70 {.frequency = CPUFREQ_TABLE_END},
73 static struct cpufreq_frequency_table *freq_table[RK_MAX_CLUSTERS + 1];
74 /*********************************************************/
75 /* additional symantics for "relation" in cpufreq with pm */
76 #define DISABLE_FURTHER_CPUFREQ 0x10
77 #define ENABLE_FURTHER_CPUFREQ 0x20
78 #define MASK_FURTHER_CPUFREQ 0x30
79 /* With 0x00(NOCHANGE), it depends on the previous "further" status */
80 #define CPUFREQ_PRIVATE 0x100
81 static unsigned int no_cpufreq_access[RK_MAX_CLUSTERS] = { 0 };
82 static unsigned int suspend_freq[RK_MAX_CLUSTERS] = { 816 * 1000, 816 * 1000 };
83 static unsigned int suspend_volt = 1100000;
84 static unsigned int low_battery_freq[RK_MAX_CLUSTERS] = { 600 * 1000,
86 static unsigned int low_battery_capacity = 5;
87 static bool is_booting = true;
88 static DEFINE_MUTEX(cpufreq_mutex);
89 static struct dvfs_node *clk_cpu_dvfs_node[RK_MAX_CLUSTERS];
90 static struct dvfs_node *clk_gpu_dvfs_node;
91 static struct dvfs_node *clk_ddr_dvfs_node;
92 static u32 cluster_policy_cpu[RK_MAX_CLUSTERS];
93 static unsigned int big_little = 1;
95 /*******************************************************/
96 static inline int cpu_to_cluster(int cpu)
98 return topology_physical_package_id(cpu);
101 static unsigned int rockchip_bl_cpufreq_get_rate(unsigned int cpu)
103 u32 cur_cluster = cpu_to_cluster(cpu);
105 if (clk_cpu_dvfs_node[cur_cluster])
106 return clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
111 static bool cpufreq_is_ondemand(struct cpufreq_policy *policy)
115 if (policy && policy->governor)
116 c = policy->governor->name[0];
117 return (c == 'o' || c == 'i' || c == 'c' || c == 'h');
120 static unsigned int get_freq_from_table(unsigned int max_freq,
121 unsigned int cluster)
124 unsigned int target_freq = 0;
126 for (i = 0; freq_table[cluster][i].frequency != CPUFREQ_TABLE_END;
128 unsigned int freq = freq_table[cluster][i].frequency;
130 if (freq <= max_freq && target_freq < freq)
134 target_freq = max_freq;
138 static int rockchip_bl_cpufreq_notifier_policy(struct notifier_block *nb,
142 static unsigned int min_rate = 0, max_rate = -1;
143 struct cpufreq_policy *policy = data;
144 u32 cur_cluster = cpu_to_cluster(policy->cpu);
146 if (val != CPUFREQ_ADJUST)
149 if (cpufreq_is_ondemand(policy)) {
150 FREQ_DBG("queue work\n");
151 dvfs_clk_enable_limit(clk_cpu_dvfs_node[cur_cluster],
154 FREQ_DBG("cancel work\n");
155 dvfs_clk_get_limit(clk_cpu_dvfs_node[cur_cluster],
156 &min_rate, &max_rate);
162 static struct notifier_block notifier_policy_block = {
163 .notifier_call = rockchip_bl_cpufreq_notifier_policy
166 static int rockchip_bl_cpufreq_verify(struct cpufreq_policy *policy)
168 u32 cur_cluster = cpu_to_cluster(policy->cpu);
170 if (!freq_table[cur_cluster])
172 return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
175 static int clk_node_get_cluster_id(struct clk *clk)
179 for (i = 0; i < RK_MAX_CLUSTERS; i++) {
180 if (clk_cpu_dvfs_node[i]->clk == clk)
186 static int rockchip_bl_cpufreq_scale_rate_for_dvfs(struct clk *clk,
190 struct cpufreq_freqs freqs;
191 struct cpufreq_policy *policy;
194 cur_cluster = clk_node_get_cluster_id(clk);
195 policy = cpufreq_cpu_get(cluster_policy_cpu[cur_cluster]);
197 freqs.new = rate / 1000;
198 freqs.old = clk_get_rate(clk) / 1000;
200 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
202 FREQ_DBG("cpufreq_scale_rate_for_dvfs(%lu)\n", rate);
204 ret = clk_set_rate(clk, rate);
206 freqs.new = clk_get_rate(clk) / 1000;
208 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
210 cpufreq_cpu_put(policy);
214 static int cluster_cpus_freq_dvfs_init(u32 cluster_id, char *dvfs_name)
216 clk_cpu_dvfs_node[cluster_id] = clk_get_dvfs_node(dvfs_name);
218 if (!clk_cpu_dvfs_node[cluster_id]) {
219 FREQ_ERR("%s:cluster_id=%d,get dvfs err\n",
220 __func__, cluster_id);
223 dvfs_clk_register_set_rate_callback(
224 clk_cpu_dvfs_node[cluster_id],
225 rockchip_bl_cpufreq_scale_rate_for_dvfs);
226 freq_table[cluster_id] =
227 dvfs_get_freq_volt_table(clk_cpu_dvfs_node[cluster_id]);
228 if (freq_table[cluster_id] == NULL) {
229 freq_table[cluster_id] = default_freq_table;
234 for (i = 0; freq_table[cluster_id][i].frequency !=
235 CPUFREQ_TABLE_END; i++) {
236 if (freq_table[cluster_id][i].index >= suspend_volt &&
237 v > freq_table[cluster_id][i].index) {
238 suspend_freq[cluster_id] =
239 freq_table[cluster_id][i].frequency;
240 v = freq_table[cluster_id][i].index;
244 low_battery_freq[cluster_id] =
245 get_freq_from_table(low_battery_freq[cluster_id], cluster_id);
246 clk_enable_dvfs(clk_cpu_dvfs_node[cluster_id]);
250 static int rockchip_bl_cpufreq_init_cpu0(struct cpufreq_policy *policy)
252 clk_gpu_dvfs_node = clk_get_dvfs_node("clk_gpu");
253 if (clk_gpu_dvfs_node)
254 clk_enable_dvfs(clk_gpu_dvfs_node);
256 clk_ddr_dvfs_node = clk_get_dvfs_node("clk_ddr");
257 if (clk_ddr_dvfs_node)
258 clk_enable_dvfs(clk_ddr_dvfs_node);
260 cluster_cpus_freq_dvfs_init(0, "clk_core_b");
261 cluster_cpus_freq_dvfs_init(1, "clk_core_l");
263 cpufreq_register_notifier(¬ifier_policy_block,
264 CPUFREQ_POLICY_NOTIFIER);
266 pr_info("version " VERSION ", suspend freq %d %d MHz\n",
267 suspend_freq[0] / 1000, suspend_freq[1] / 1000);
271 static int rockchip_bl_cpufreq_init(struct cpufreq_policy *policy)
274 u32 cur_cluster = cpu_to_cluster(policy->cpu);
276 if (policy->cpu == 0)
277 cpu0_err = rockchip_bl_cpufreq_init_cpu0(policy);
281 cluster_policy_cpu[cur_cluster] = policy->cpu;
283 /* set freq min max */
284 cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
286 cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
288 if (cur_cluster < RK_MAX_CLUSTERS)
289 cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
291 policy->cur = clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
293 /* make ondemand default sampling_rate to 40000 */
294 policy->cpuinfo.transition_latency = 40 * NSEC_PER_USEC;
299 static int rockchip_bl_cpufreq_exit(struct cpufreq_policy *policy)
301 u32 cur_cluster = cpu_to_cluster(policy->cpu);
303 if (policy->cpu == 0) {
304 cpufreq_unregister_notifier(¬ifier_policy_block,
305 CPUFREQ_POLICY_NOTIFIER);
307 cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
308 clk_put_dvfs_node(clk_cpu_dvfs_node[cur_cluster]);
313 static struct freq_attr *rockchip_bl_cpufreq_attr[] = {
314 &cpufreq_freq_attr_scaling_available_freqs,
318 #ifdef CONFIG_CHARGER_DISPLAY
319 extern int rk_get_system_battery_capacity(void);
321 static int rk_get_system_battery_capacity(void)
328 rockchip_bl_cpufreq_scale_limit(unsigned int target_freq,
329 struct cpufreq_policy *policy, bool is_private)
331 bool is_ondemand = cpufreq_is_ondemand(policy);
332 u32 cur_cluster = cpu_to_cluster(policy->cpu);
338 s64 boottime_ms = ktime_to_ms(ktime_get_boottime());
340 if (boottime_ms > 60 * MSEC_PER_SEC) {
342 } else if (target_freq > low_battery_freq[cur_cluster] &&
343 rk_get_system_battery_capacity() <=
344 low_battery_capacity) {
345 target_freq = low_battery_freq[cur_cluster];
352 static int rockchip_bl_cpufreq_target(struct cpufreq_policy *policy,
353 unsigned int target_freq,
354 unsigned int relation)
356 unsigned int i, new_freq = target_freq, new_rate, cur_rate;
359 u32 cur_cluster = cpu_to_cluster(policy->cpu);
361 if (!freq_table[cur_cluster]) {
362 FREQ_ERR("no freq table!\n");
366 mutex_lock(&cpufreq_mutex);
368 is_private = relation & CPUFREQ_PRIVATE;
369 relation &= ~CPUFREQ_PRIVATE;
371 if ((relation & ENABLE_FURTHER_CPUFREQ) &&
372 no_cpufreq_access[cur_cluster])
373 no_cpufreq_access[cur_cluster]--;
374 if (no_cpufreq_access[cur_cluster]) {
375 FREQ_LOG("denied access to %s as it is disabled temporarily\n",
380 if (relation & DISABLE_FURTHER_CPUFREQ)
381 no_cpufreq_access[cur_cluster]++;
382 relation &= ~MASK_FURTHER_CPUFREQ;
384 ret = cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
385 target_freq, relation, &i);
387 FREQ_ERR("no freq match for %d(ret=%d)\n", target_freq, ret);
390 new_freq = freq_table[cur_cluster][i].frequency;
391 if (!no_cpufreq_access[cur_cluster])
393 rockchip_bl_cpufreq_scale_limit(new_freq, policy,
396 new_rate = new_freq * 1000;
397 cur_rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[cur_cluster]);
398 FREQ_LOG("req = %7u new = %7u (was = %7u)\n", target_freq,
399 new_freq, cur_rate / 1000);
400 if (new_rate == cur_rate)
402 ret = dvfs_clk_set_rate(clk_cpu_dvfs_node[cur_cluster], new_rate);
405 FREQ_DBG("set freq (%7u) end, ret %d\n", new_freq, ret);
406 mutex_unlock(&cpufreq_mutex);
410 static int rockchip_bl_cpufreq_pm_notifier_event(struct notifier_block *this,
411 unsigned long event, void *ptr)
413 int ret = NOTIFY_DONE;
416 for (i = 0; i < RK_MAX_CLUSTERS; i++) {
417 struct cpufreq_policy *policy =
418 cpufreq_cpu_get(cluster_policy_cpu[i]);
423 if (!cpufreq_is_ondemand(policy))
427 case PM_SUSPEND_PREPARE:
429 ret = cpufreq_driver_target(policy, suspend_freq[i],
430 DISABLE_FURTHER_CPUFREQ |
438 case PM_POST_RESTORE:
439 case PM_POST_SUSPEND:
440 /* if (target_freq == policy->cur) then
441 cpufreq_driver_target will return, and
442 our target will not be called, it casue
443 ENABLE_FURTHER_CPUFREQ flag invalid,
446 cpufreq_driver_target(policy, suspend_freq[i],
447 ENABLE_FURTHER_CPUFREQ |
453 cpufreq_cpu_put(policy);
458 static struct notifier_block rockchip_bl_cpufreq_pm_notifier = {
459 .notifier_call = rockchip_bl_cpufreq_pm_notifier_event,
462 static int rockchip_bl_cpufreq_reboot_limit_freq(void)
464 struct regulator *regulator;
469 dvfs_disable_temp_limit();
471 for (i = 0; i < RK_MAX_CLUSTERS; i++) {
472 dvfs_clk_enable_limit(clk_cpu_dvfs_node[i],
473 1000 * suspend_freq[i],
474 1000 * suspend_freq[i]);
475 rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[i]);
478 regulator = dvfs_get_regulator("vdd_arm");
480 volt = regulator_get_voltage(regulator);
482 pr_info("get arm regulator failed\n");
483 pr_info("reboot set cluster0 rate=%lu, cluster1 rate=%lu, volt=%d\n",
484 dvfs_clk_get_rate(clk_cpu_dvfs_node[0]),
485 dvfs_clk_get_rate(clk_cpu_dvfs_node[1]), volt);
490 static int rockchip_bl_cpufreq_reboot_notifier_event(struct notifier_block
491 *this, unsigned long event,
494 rockchip_set_system_status(SYS_STATUS_REBOOT);
495 rockchip_bl_cpufreq_reboot_limit_freq();
500 static struct notifier_block rockchip_bl_cpufreq_reboot_notifier = {
501 .notifier_call = rockchip_bl_cpufreq_reboot_notifier_event,
504 static struct cpufreq_driver rockchip_bl_cpufreq_driver = {
505 .flags = CPUFREQ_CONST_LOOPS,
506 .verify = rockchip_bl_cpufreq_verify,
507 .target = rockchip_bl_cpufreq_target,
508 .get = rockchip_bl_cpufreq_get_rate,
509 .init = rockchip_bl_cpufreq_init,
510 .exit = rockchip_bl_cpufreq_exit,
511 .name = "rockchip-bl",
512 .have_governor_per_policy = true,
513 .attr = rockchip_bl_cpufreq_attr,
516 static const struct of_device_id rockchip_bl_cpufreq_match[] = {
518 .compatible = "rockchip,rk3368-cpufreq",
522 MODULE_DEVICE_TABLE(of, rockchip_bl_cpufreq_match);
524 static int rockchip_bl_cpufreq_probe(struct platform_device *pdev)
526 struct device_node *np;
527 struct regmap *grf_regmap;
528 unsigned int big_bits, litt_bits;
531 np = pdev->dev.of_node;
535 grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
536 if (IS_ERR(grf_regmap)) {
537 FREQ_ERR("Cpufreq couldn't find grf regmap\n");
538 return PTR_ERR(grf_regmap);
540 ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(3), &big_bits);
542 FREQ_ERR("Cpufreq couldn't read to GRF\n");
545 ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(1), &litt_bits);
547 FREQ_ERR("Cpufreq couldn't read to GRF\n");
551 big_bits = (big_bits >> 8) & 0x03;
552 litt_bits = (litt_bits >> 8) & 0x03;
554 if (big_bits == 0x01 && litt_bits == 0x00)
556 else if (big_bits == 0x0 && litt_bits == 0x01)
558 pr_info("boot from %d\n", big_little);
560 register_reboot_notifier(&rockchip_bl_cpufreq_reboot_notifier);
561 register_pm_notifier(&rockchip_bl_cpufreq_pm_notifier);
563 return cpufreq_register_driver(&rockchip_bl_cpufreq_driver);
566 static int rockchip_bl_cpufreq_remove(struct platform_device *pdev)
568 cpufreq_unregister_driver(&rockchip_bl_cpufreq_driver);
572 static struct platform_driver rockchip_bl_cpufreq_platdrv = {
574 .name = "rockchip-bl-cpufreq",
575 .owner = THIS_MODULE,
576 .of_match_table = rockchip_bl_cpufreq_match,
578 .probe = rockchip_bl_cpufreq_probe,
579 .remove = rockchip_bl_cpufreq_remove,
582 module_platform_driver(rockchip_bl_cpufreq_platdrv);
584 MODULE_AUTHOR("Xiao Feng <xf@rock-chips.com>");
585 MODULE_LICENSE("GPL");