|
@@ -0,0 +1,282 @@
|
|
|
+/*
|
|
|
+ * ARM big.LITTLE Platforms CPUFreq support
|
|
|
+ *
|
|
|
+ * Copyright (C) 2013 ARM Ltd.
|
|
|
+ * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
|
|
|
+ *
|
|
|
+ * Copyright (C) 2013 Linaro.
|
|
|
+ * Viresh Kumar <viresh.kumar@linaro.org>
|
|
|
+ *
|
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
|
+ * it under the terms of the GNU General Public License version 2 as
|
|
|
+ * published by the Free Software Foundation.
|
|
|
+ *
|
|
|
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
|
+ * kind, whether express or implied; without even the implied warranty
|
|
|
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
+ * GNU General Public License for more details.
|
|
|
+ */
|
|
|
+
|
|
|
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
+
|
|
|
+#include <linux/clk.h>
|
|
|
+#include <linux/cpu.h>
|
|
|
+#include <linux/cpufreq.h>
|
|
|
+#include <linux/cpumask.h>
|
|
|
+#include <linux/export.h>
|
|
|
+#include <linux/of_platform.h>
|
|
|
+#include <linux/opp.h>
|
|
|
+#include <linux/slab.h>
|
|
|
+#include <linux/topology.h>
|
|
|
+#include <linux/types.h>
|
|
|
+
|
|
|
+#include "arm_big_little.h"
|
|
|
+
|
|
|
+/* Currently we support only two clusters */
|
|
|
+#define MAX_CLUSTERS 2
|
|
|
+
|
|
|
+static struct cpufreq_arm_bL_ops *arm_bL_ops;
|
|
|
+static struct clk *clk[MAX_CLUSTERS];
|
|
|
+static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS];
|
|
|
+static atomic_t cluster_usage[MAX_CLUSTERS] = {ATOMIC_INIT(0), ATOMIC_INIT(0)};
|
|
|
+
|
|
|
+static int cpu_to_cluster(int cpu)
|
|
|
+{
|
|
|
+ return topology_physical_package_id(cpu);
|
|
|
+}
|
|
|
+
|
|
|
+static unsigned int bL_cpufreq_get(unsigned int cpu)
|
|
|
+{
|
|
|
+ u32 cur_cluster = cpu_to_cluster(cpu);
|
|
|
+
|
|
|
+ return clk_get_rate(clk[cur_cluster]) / 1000;
|
|
|
+}
|
|
|
+
|
|
|
+/* Validate policy frequency range */
|
|
|
+static int bL_cpufreq_verify_policy(struct cpufreq_policy *policy)
|
|
|
+{
|
|
|
+ u32 cur_cluster = cpu_to_cluster(policy->cpu);
|
|
|
+
|
|
|
+ return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
|
|
|
+}
|
|
|
+
|
|
|
+/* Set clock frequency */
|
|
|
+static int bL_cpufreq_set_target(struct cpufreq_policy *policy,
|
|
|
+ unsigned int target_freq, unsigned int relation)
|
|
|
+{
|
|
|
+ struct cpufreq_freqs freqs;
|
|
|
+ u32 cpu = policy->cpu, freq_tab_idx, cur_cluster;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ cur_cluster = cpu_to_cluster(policy->cpu);
|
|
|
+
|
|
|
+ freqs.old = bL_cpufreq_get(policy->cpu);
|
|
|
+
|
|
|
+ /* Determine valid target frequency using freq_table */
|
|
|
+ cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
|
|
|
+ target_freq, relation, &freq_tab_idx);
|
|
|
+ freqs.new = freq_table[cur_cluster][freq_tab_idx].frequency;
|
|
|
+
|
|
|
+ freqs.cpu = policy->cpu;
|
|
|
+
|
|
|
+ pr_debug("%s: cpu: %d, cluster: %d, oldfreq: %d, target freq: %d, new freq: %d\n",
|
|
|
+ __func__, cpu, cur_cluster, freqs.old, target_freq,
|
|
|
+ freqs.new);
|
|
|
+
|
|
|
+ if (freqs.old == freqs.new)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ for_each_cpu(freqs.cpu, policy->cpus)
|
|
|
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
|
|
+
|
|
|
+ ret = clk_set_rate(clk[cur_cluster], freqs.new * 1000);
|
|
|
+ if (ret) {
|
|
|
+ pr_err("clk_set_rate failed: %d\n", ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ policy->cur = freqs.new;
|
|
|
+
|
|
|
+ for_each_cpu(freqs.cpu, policy->cpus)
|
|
|
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
|
|
|
+{
|
|
|
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
|
|
|
+
|
|
|
+ if (!atomic_dec_return(&cluster_usage[cluster])) {
|
|
|
+ clk_put(clk[cluster]);
|
|
|
+ opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
|
|
|
+ dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
|
|
|
+{
|
|
|
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
|
|
|
+ char name[14] = "cpu-cluster.";
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (atomic_inc_return(&cluster_usage[cluster]) != 1)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ret = arm_bL_ops->init_opp_table(cpu_dev);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n",
|
|
|
+ __func__, cpu_dev->id, ret);
|
|
|
+ goto atomic_dec;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = opp_init_cpufreq_table(cpu_dev, &freq_table[cluster]);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(cpu_dev, "%s: failed to init cpufreq table, cpu: %d, err: %d\n",
|
|
|
+ __func__, cpu_dev->id, ret);
|
|
|
+ goto atomic_dec;
|
|
|
+ }
|
|
|
+
|
|
|
+ name[12] = cluster + '0';
|
|
|
+ clk[cluster] = clk_get_sys(name, NULL);
|
|
|
+ if (!IS_ERR(clk[cluster])) {
|
|
|
+ dev_dbg(cpu_dev, "%s: clk: %p & freq table: %p, cluster: %d\n",
|
|
|
+ __func__, clk[cluster], freq_table[cluster],
|
|
|
+ cluster);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d, cluster: %d\n",
|
|
|
+ __func__, cpu_dev->id, cluster);
|
|
|
+ ret = PTR_ERR(clk[cluster]);
|
|
|
+ opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
|
|
|
+
|
|
|
+atomic_dec:
|
|
|
+ atomic_dec(&cluster_usage[cluster]);
|
|
|
+ dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__,
|
|
|
+ cluster);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/* Per-CPU initialization */
|
|
|
+static int bL_cpufreq_init(struct cpufreq_policy *policy)
|
|
|
+{
|
|
|
+ u32 cur_cluster = cpu_to_cluster(policy->cpu);
|
|
|
+ struct device *cpu_dev;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ cpu_dev = get_cpu_device(policy->cpu);
|
|
|
+ if (!cpu_dev) {
|
|
|
+ pr_err("%s: failed to get cpu%d device\n", __func__,
|
|
|
+ policy->cpu);
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = get_cluster_clk_and_freq_table(cpu_dev);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ ret = cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
|
|
|
+ policy->cpu, cur_cluster);
|
|
|
+ put_cluster_clk_and_freq_table(cpu_dev);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
|
|
|
+
|
|
|
+ if (arm_bL_ops->get_transition_latency)
|
|
|
+ policy->cpuinfo.transition_latency =
|
|
|
+ arm_bL_ops->get_transition_latency(cpu_dev);
|
|
|
+ else
|
|
|
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
|
|
|
+
|
|
|
+ policy->cur = bL_cpufreq_get(policy->cpu);
|
|
|
+
|
|
|
+ cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
|
|
|
+
|
|
|
+ dev_info(cpu_dev, "CPU %d initialized\n", policy->cpu);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int bL_cpufreq_exit(struct cpufreq_policy *policy)
|
|
|
+{
|
|
|
+ struct device *cpu_dev;
|
|
|
+
|
|
|
+ cpu_dev = get_cpu_device(policy->cpu);
|
|
|
+ if (!cpu_dev) {
|
|
|
+ pr_err("%s: failed to get cpu%d device\n", __func__,
|
|
|
+ policy->cpu);
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ put_cluster_clk_and_freq_table(cpu_dev);
|
|
|
+ dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* Export freq_table to sysfs */
|
|
|
+static struct freq_attr *bL_cpufreq_attr[] = {
|
|
|
+ &cpufreq_freq_attr_scaling_available_freqs,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static struct cpufreq_driver bL_cpufreq_driver = {
|
|
|
+ .name = "arm-big-little",
|
|
|
+ .flags = CPUFREQ_STICKY,
|
|
|
+ .verify = bL_cpufreq_verify_policy,
|
|
|
+ .target = bL_cpufreq_set_target,
|
|
|
+ .get = bL_cpufreq_get,
|
|
|
+ .init = bL_cpufreq_init,
|
|
|
+ .exit = bL_cpufreq_exit,
|
|
|
+ .have_multiple_policies = true,
|
|
|
+ .attr = bL_cpufreq_attr,
|
|
|
+};
|
|
|
+
|
|
|
+int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (arm_bL_ops) {
|
|
|
+ pr_debug("%s: Already registered: %s, exiting\n", __func__,
|
|
|
+ arm_bL_ops->name);
|
|
|
+ return -EBUSY;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!ops || !strlen(ops->name) || !ops->init_opp_table) {
|
|
|
+ pr_err("%s: Invalid arm_bL_ops, exiting\n", __func__);
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ arm_bL_ops = ops;
|
|
|
+
|
|
|
+ ret = cpufreq_register_driver(&bL_cpufreq_driver);
|
|
|
+ if (ret) {
|
|
|
+ pr_info("%s: Failed registering platform driver: %s, err: %d\n",
|
|
|
+ __func__, ops->name, ret);
|
|
|
+ arm_bL_ops = NULL;
|
|
|
+ } else {
|
|
|
+ pr_info("%s: Registered platform driver: %s\n", __func__,
|
|
|
+ ops->name);
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(bL_cpufreq_register);
|
|
|
+
|
|
|
+void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
|
|
|
+{
|
|
|
+ if (arm_bL_ops != ops) {
|
|
|
+ pr_err("%s: Registered with: %s, can't unregister, exiting\n",
|
|
|
+ __func__, arm_bL_ops->name);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ cpufreq_unregister_driver(&bL_cpufreq_driver);
|
|
|
+ pr_info("%s: Un-registered platform driver: %s\n", __func__,
|
|
|
+ arm_bL_ops->name);
|
|
|
+ arm_bL_ops = NULL;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(bL_cpufreq_unregister);
|