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authorSudeep Holla <sudeep.holla@arm.com>2019-10-21 12:20:34 +0200
committerViresh Kumar <viresh.kumar@linaro.org>2019-10-21 12:53:58 +0200
commita0f950d3a0addc9552233aa2ffbdc086aa02106a (patch)
tree2867bb31d211a77630f76a5530da16d3f443021c /drivers/cpufreq/vexpress-spc-cpufreq.c
parentcpufreq: scpi: remove stale/outdated comment about the driver (diff)
downloadlinux-a0f950d3a0addc9552233aa2ffbdc086aa02106a.tar.xz
linux-a0f950d3a0addc9552233aa2ffbdc086aa02106a.zip
cpufreq: merge arm_big_little and vexpress-spc
arm_big_little cpufreq driver was designed as a generic big little driver that could be used by any platform and make use of bL switcher. Over years alternate solutions have been designed and merged to deal with bL/HMP systems like EAS. Also since no other driver made use of generic arm_big_little cpufreq driver except Vexpress SPC, we can merge them together as vexpress-spc driver used only on Vexpress TC2(CA15_CA7) platform. Acked-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/vexpress-spc-cpufreq.c')
-rw-r--r--drivers/cpufreq/vexpress-spc-cpufreq.c660
1 files changed, 646 insertions, 14 deletions
diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c
index 53237289e606..622dc42e42b1 100644
--- a/drivers/cpufreq/vexpress-spc-cpufreq.c
+++ b/drivers/cpufreq/vexpress-spc-cpufreq.c
@@ -1,31 +1,660 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Versatile Express SPC CPUFreq Interface driver
*
- * It provides necessary ops to arm_big_little cpufreq driver.
+ * Copyright (C) 2013 - 2019 ARM Ltd.
+ * Sudeep Holla <sudeep.holla@arm.com>
*
- * Copyright (C) 2013 ARM Ltd.
- * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
- *
- * 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.
+ * Copyright (C) 2013 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
*/
#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/cpu_cooling.h>
+#include <linux/device.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
+#include <linux/slab.h>
+#include <linux/topology.h>
#include <linux/types.h>
-#include "arm_big_little.h"
+struct cpufreq_arm_bL_ops {
+ char name[CPUFREQ_NAME_LEN];
+
+ /*
+ * This must set opp table for cpu_dev in a similar way as done by
+ * dev_pm_opp_of_add_table().
+ */
+ int (*init_opp_table)(const struct cpumask *cpumask);
+
+ /* Optional */
+ int (*get_transition_latency)(struct device *cpu_dev);
+ void (*free_opp_table)(const struct cpumask *cpumask);
+};
+
+/* Currently we support only two clusters */
+#define A15_CLUSTER 0
+#define A7_CLUSTER 1
+#define MAX_CLUSTERS 2
+
+#ifdef CONFIG_BL_SWITCHER
+#include <asm/bL_switcher.h>
+static bool bL_switching_enabled;
+#define is_bL_switching_enabled() bL_switching_enabled
+#define set_switching_enabled(x) (bL_switching_enabled = (x))
+#else
+#define is_bL_switching_enabled() false
+#define set_switching_enabled(x) do { } while (0)
+#define bL_switch_request(...) do { } while (0)
+#define bL_switcher_put_enabled() do { } while (0)
+#define bL_switcher_get_enabled() do { } while (0)
+#endif
+
+#define ACTUAL_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq << 1 : freq)
+#define VIRT_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq >> 1 : freq)
+
+static struct thermal_cooling_device *cdev[MAX_CLUSTERS];
+static const struct cpufreq_arm_bL_ops *arm_bL_ops;
+static struct clk *clk[MAX_CLUSTERS];
+static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS + 1];
+static atomic_t cluster_usage[MAX_CLUSTERS + 1];
+
+static unsigned int clk_big_min; /* (Big) clock frequencies */
+static unsigned int clk_little_max; /* Maximum clock frequency (Little) */
+
+static DEFINE_PER_CPU(unsigned int, physical_cluster);
+static DEFINE_PER_CPU(unsigned int, cpu_last_req_freq);
+
+static struct mutex cluster_lock[MAX_CLUSTERS];
+
+static inline int raw_cpu_to_cluster(int cpu)
+{
+ return topology_physical_package_id(cpu);
+}
+
+static inline int cpu_to_cluster(int cpu)
+{
+ return is_bL_switching_enabled() ?
+ MAX_CLUSTERS : raw_cpu_to_cluster(cpu);
+}
+
+static unsigned int find_cluster_maxfreq(int cluster)
+{
+ int j;
+ u32 max_freq = 0, cpu_freq;
+
+ for_each_online_cpu(j) {
+ cpu_freq = per_cpu(cpu_last_req_freq, j);
+
+ if ((cluster == per_cpu(physical_cluster, j)) &&
+ (max_freq < cpu_freq))
+ max_freq = cpu_freq;
+ }
+
+ pr_debug("%s: cluster: %d, max freq: %d\n", __func__, cluster,
+ max_freq);
+
+ return max_freq;
+}
+
+static unsigned int clk_get_cpu_rate(unsigned int cpu)
+{
+ u32 cur_cluster = per_cpu(physical_cluster, cpu);
+ u32 rate = clk_get_rate(clk[cur_cluster]) / 1000;
+
+ /* For switcher we use virtual A7 clock rates */
+ if (is_bL_switching_enabled())
+ rate = VIRT_FREQ(cur_cluster, rate);
+
+ pr_debug("%s: cpu: %d, cluster: %d, freq: %u\n", __func__, cpu,
+ cur_cluster, rate);
+
+ return rate;
+}
+
+static unsigned int bL_cpufreq_get_rate(unsigned int cpu)
+{
+ if (is_bL_switching_enabled()) {
+ pr_debug("%s: freq: %d\n", __func__, per_cpu(cpu_last_req_freq,
+ cpu));
+
+ return per_cpu(cpu_last_req_freq, cpu);
+ } else {
+ return clk_get_cpu_rate(cpu);
+ }
+}
+
+static unsigned int
+bL_cpufreq_set_rate(u32 cpu, u32 old_cluster, u32 new_cluster, u32 rate)
+{
+ u32 new_rate, prev_rate;
+ int ret;
+ bool bLs = is_bL_switching_enabled();
+
+ mutex_lock(&cluster_lock[new_cluster]);
+
+ if (bLs) {
+ prev_rate = per_cpu(cpu_last_req_freq, cpu);
+ per_cpu(cpu_last_req_freq, cpu) = rate;
+ per_cpu(physical_cluster, cpu) = new_cluster;
+
+ new_rate = find_cluster_maxfreq(new_cluster);
+ new_rate = ACTUAL_FREQ(new_cluster, new_rate);
+ } else {
+ new_rate = rate;
+ }
+
+ pr_debug("%s: cpu: %d, old cluster: %d, new cluster: %d, freq: %d\n",
+ __func__, cpu, old_cluster, new_cluster, new_rate);
+
+ ret = clk_set_rate(clk[new_cluster], new_rate * 1000);
+ if (!ret) {
+ /*
+ * FIXME: clk_set_rate hasn't returned an error here however it
+ * may be that clk_change_rate failed due to hardware or
+ * firmware issues and wasn't able to report that due to the
+ * current design of the clk core layer. To work around this
+ * problem we will read back the clock rate and check it is
+ * correct. This needs to be removed once clk core is fixed.
+ */
+ if (clk_get_rate(clk[new_cluster]) != new_rate * 1000)
+ ret = -EIO;
+ }
+
+ if (WARN_ON(ret)) {
+ pr_err("clk_set_rate failed: %d, new cluster: %d\n", ret,
+ new_cluster);
+ if (bLs) {
+ per_cpu(cpu_last_req_freq, cpu) = prev_rate;
+ per_cpu(physical_cluster, cpu) = old_cluster;
+ }
+
+ mutex_unlock(&cluster_lock[new_cluster]);
+
+ return ret;
+ }
+
+ mutex_unlock(&cluster_lock[new_cluster]);
+
+ /* Recalc freq for old cluster when switching clusters */
+ if (old_cluster != new_cluster) {
+ pr_debug("%s: cpu: %d, old cluster: %d, new cluster: %d\n",
+ __func__, cpu, old_cluster, new_cluster);
+
+ /* Switch cluster */
+ bL_switch_request(cpu, new_cluster);
+
+ mutex_lock(&cluster_lock[old_cluster]);
+
+ /* Set freq of old cluster if there are cpus left on it */
+ new_rate = find_cluster_maxfreq(old_cluster);
+ new_rate = ACTUAL_FREQ(old_cluster, new_rate);
+
+ if (new_rate) {
+ pr_debug("%s: Updating rate of old cluster: %d, to freq: %d\n",
+ __func__, old_cluster, new_rate);
+
+ if (clk_set_rate(clk[old_cluster], new_rate * 1000))
+ pr_err("%s: clk_set_rate failed: %d, old cluster: %d\n",
+ __func__, ret, old_cluster);
+ }
+ mutex_unlock(&cluster_lock[old_cluster]);
+ }
+
+ return 0;
+}
+
+/* Set clock frequency */
+static int bL_cpufreq_set_target(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ u32 cpu = policy->cpu, cur_cluster, new_cluster, actual_cluster;
+ unsigned int freqs_new;
+ int ret;
+
+ cur_cluster = cpu_to_cluster(cpu);
+ new_cluster = actual_cluster = per_cpu(physical_cluster, cpu);
+
+ freqs_new = freq_table[cur_cluster][index].frequency;
+
+ if (is_bL_switching_enabled()) {
+ if ((actual_cluster == A15_CLUSTER) &&
+ (freqs_new < clk_big_min)) {
+ new_cluster = A7_CLUSTER;
+ } else if ((actual_cluster == A7_CLUSTER) &&
+ (freqs_new > clk_little_max)) {
+ new_cluster = A15_CLUSTER;
+ }
+ }
+
+ ret = bL_cpufreq_set_rate(cpu, actual_cluster, new_cluster, freqs_new);
+
+ if (!ret) {
+ arch_set_freq_scale(policy->related_cpus, freqs_new,
+ policy->cpuinfo.max_freq);
+ }
+
+ return ret;
+}
+
+static inline u32 get_table_count(struct cpufreq_frequency_table *table)
+{
+ int count;
+
+ for (count = 0; table[count].frequency != CPUFREQ_TABLE_END; count++)
+ ;
+
+ return count;
+}
+
+/* get the minimum frequency in the cpufreq_frequency_table */
+static inline u32 get_table_min(struct cpufreq_frequency_table *table)
+{
+ struct cpufreq_frequency_table *pos;
+ uint32_t min_freq = ~0;
+ cpufreq_for_each_entry(pos, table)
+ if (pos->frequency < min_freq)
+ min_freq = pos->frequency;
+ return min_freq;
+}
+
+/* get the maximum frequency in the cpufreq_frequency_table */
+static inline u32 get_table_max(struct cpufreq_frequency_table *table)
+{
+ struct cpufreq_frequency_table *pos;
+ uint32_t max_freq = 0;
+ cpufreq_for_each_entry(pos, table)
+ if (pos->frequency > max_freq)
+ max_freq = pos->frequency;
+ return max_freq;
+}
+
+static int merge_cluster_tables(void)
+{
+ int i, j, k = 0, count = 1;
+ struct cpufreq_frequency_table *table;
+
+ for (i = 0; i < MAX_CLUSTERS; i++)
+ count += get_table_count(freq_table[i]);
+
+ table = kcalloc(count, sizeof(*table), GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+
+ freq_table[MAX_CLUSTERS] = table;
+
+ /* Add in reverse order to get freqs in increasing order */
+ for (i = MAX_CLUSTERS - 1; i >= 0; i--) {
+ for (j = 0; freq_table[i][j].frequency != CPUFREQ_TABLE_END;
+ j++) {
+ table[k].frequency = VIRT_FREQ(i,
+ freq_table[i][j].frequency);
+ pr_debug("%s: index: %d, freq: %d\n", __func__, k,
+ table[k].frequency);
+ k++;
+ }
+ }
+
+ table[k].driver_data = k;
+ table[k].frequency = CPUFREQ_TABLE_END;
+
+ pr_debug("%s: End, table: %p, count: %d\n", __func__, table, k);
+
+ return 0;
+}
+
+static void _put_cluster_clk_and_freq_table(struct device *cpu_dev,
+ const struct cpumask *cpumask)
+{
+ u32 cluster = raw_cpu_to_cluster(cpu_dev->id);
+
+ if (!freq_table[cluster])
+ return;
+
+ clk_put(clk[cluster]);
+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+ if (arm_bL_ops->free_opp_table)
+ arm_bL_ops->free_opp_table(cpumask);
+ dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster);
+}
+
+static void put_cluster_clk_and_freq_table(struct device *cpu_dev,
+ const struct cpumask *cpumask)
+{
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
+ int i;
+
+ if (atomic_dec_return(&cluster_usage[cluster]))
+ return;
+
+ if (cluster < MAX_CLUSTERS)
+ return _put_cluster_clk_and_freq_table(cpu_dev, cpumask);
+
+ for_each_present_cpu(i) {
+ struct device *cdev = get_cpu_device(i);
+ if (!cdev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__, i);
+ return;
+ }
+
+ _put_cluster_clk_and_freq_table(cdev, cpumask);
+ }
+
+ /* free virtual table */
+ kfree(freq_table[cluster]);
+}
+
+static int _get_cluster_clk_and_freq_table(struct device *cpu_dev,
+ const struct cpumask *cpumask)
+{
+ u32 cluster = raw_cpu_to_cluster(cpu_dev->id);
+ int ret;
+
+ if (freq_table[cluster])
+ return 0;
+
+ ret = arm_bL_ops->init_opp_table(cpumask);
+ if (ret) {
+ dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n",
+ __func__, cpu_dev->id, ret);
+ goto out;
+ }
+
+ ret = dev_pm_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 free_opp_table;
+ }
+
+ clk[cluster] = clk_get(cpu_dev, 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]);
+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+
+free_opp_table:
+ if (arm_bL_ops->free_opp_table)
+ arm_bL_ops->free_opp_table(cpumask);
+out:
+ dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__,
+ cluster);
+ return ret;
+}
+
+static int get_cluster_clk_and_freq_table(struct device *cpu_dev,
+ const struct cpumask *cpumask)
+{
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
+ int i, ret;
+
+ if (atomic_inc_return(&cluster_usage[cluster]) != 1)
+ return 0;
+
+ if (cluster < MAX_CLUSTERS) {
+ ret = _get_cluster_clk_and_freq_table(cpu_dev, cpumask);
+ if (ret)
+ atomic_dec(&cluster_usage[cluster]);
+ return ret;
+ }
+
+ /*
+ * Get data for all clusters and fill virtual cluster with a merge of
+ * both
+ */
+ for_each_present_cpu(i) {
+ struct device *cdev = get_cpu_device(i);
+ if (!cdev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__, i);
+ return -ENODEV;
+ }
+
+ ret = _get_cluster_clk_and_freq_table(cdev, cpumask);
+ if (ret)
+ goto put_clusters;
+ }
+
+ ret = merge_cluster_tables();
+ if (ret)
+ goto put_clusters;
+
+ /* Assuming 2 cluster, set clk_big_min and clk_little_max */
+ clk_big_min = get_table_min(freq_table[0]);
+ clk_little_max = VIRT_FREQ(1, get_table_max(freq_table[1]));
+
+ pr_debug("%s: cluster: %d, clk_big_min: %d, clk_little_max: %d\n",
+ __func__, cluster, clk_big_min, clk_little_max);
+
+ return 0;
+
+put_clusters:
+ for_each_present_cpu(i) {
+ struct device *cdev = get_cpu_device(i);
+ if (!cdev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__, i);
+ return -ENODEV;
+ }
+
+ _put_cluster_clk_and_freq_table(cdev, cpumask);
+ }
+
+ atomic_dec(&cluster_usage[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;
+ }
+
+ if (cur_cluster < MAX_CLUSTERS) {
+ int cpu;
+
+ cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+
+ for_each_cpu(cpu, policy->cpus)
+ per_cpu(physical_cluster, cpu) = cur_cluster;
+ } else {
+ /* Assumption: during init, we are always running on A15 */
+ per_cpu(physical_cluster, policy->cpu) = A15_CLUSTER;
+ }
+
+ ret = get_cluster_clk_and_freq_table(cpu_dev, policy->cpus);
+ if (ret)
+ return ret;
+
+ policy->freq_table = freq_table[cur_cluster];
+ policy->cpuinfo.transition_latency =
+ arm_bL_ops->get_transition_latency(cpu_dev);
+
+ dev_pm_opp_of_register_em(policy->cpus);
+
+ if (is_bL_switching_enabled())
+ per_cpu(cpu_last_req_freq, policy->cpu) = clk_get_cpu_rate(policy->cpu);
+
+ dev_info(cpu_dev, "%s: CPU %d initialized\n", __func__, policy->cpu);
+ return 0;
+}
+
+static int bL_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ struct device *cpu_dev;
+ int cur_cluster = cpu_to_cluster(policy->cpu);
+
+ if (cur_cluster < MAX_CLUSTERS) {
+ cpufreq_cooling_unregister(cdev[cur_cluster]);
+ cdev[cur_cluster] = NULL;
+ }
+
+ 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, policy->related_cpus);
+ dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);
+
+ return 0;
+}
+
+static void bL_cpufreq_ready(struct cpufreq_policy *policy)
+{
+ int cur_cluster = cpu_to_cluster(policy->cpu);
+
+ /* Do not register a cpu_cooling device if we are in IKS mode */
+ if (cur_cluster >= MAX_CLUSTERS)
+ return;
+
+ cdev[cur_cluster] = of_cpufreq_cooling_register(policy);
+}
+
+static struct cpufreq_driver bL_cpufreq_driver = {
+ .name = "arm-big-little",
+ .flags = CPUFREQ_STICKY |
+ CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
+ CPUFREQ_NEED_INITIAL_FREQ_CHECK,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = bL_cpufreq_set_target,
+ .get = bL_cpufreq_get_rate,
+ .init = bL_cpufreq_init,
+ .exit = bL_cpufreq_exit,
+ .ready = bL_cpufreq_ready,
+ .attr = cpufreq_generic_attr,
+};
+
+#ifdef CONFIG_BL_SWITCHER
+static int bL_cpufreq_switcher_notifier(struct notifier_block *nfb,
+ unsigned long action, void *_arg)
+{
+ pr_debug("%s: action: %ld\n", __func__, action);
+
+ switch (action) {
+ case BL_NOTIFY_PRE_ENABLE:
+ case BL_NOTIFY_PRE_DISABLE:
+ cpufreq_unregister_driver(&bL_cpufreq_driver);
+ break;
+
+ case BL_NOTIFY_POST_ENABLE:
+ set_switching_enabled(true);
+ cpufreq_register_driver(&bL_cpufreq_driver);
+ break;
+
+ case BL_NOTIFY_POST_DISABLE:
+ set_switching_enabled(false);
+ cpufreq_register_driver(&bL_cpufreq_driver);
+ break;
+
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block bL_switcher_notifier = {
+ .notifier_call = bL_cpufreq_switcher_notifier,
+};
+
+static int __bLs_register_notifier(void)
+{
+ return bL_switcher_register_notifier(&bL_switcher_notifier);
+}
+
+static int __bLs_unregister_notifier(void)
+{
+ return bL_switcher_unregister_notifier(&bL_switcher_notifier);
+}
+#else
+static int __bLs_register_notifier(void) { return 0; }
+static int __bLs_unregister_notifier(void) { return 0; }
+#endif
+
+int bL_cpufreq_register(const struct cpufreq_arm_bL_ops *ops)
+{
+ int ret, i;
+
+ 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 ||
+ !ops->get_transition_latency) {
+ pr_err("%s: Invalid arm_bL_ops, exiting\n", __func__);
+ return -ENODEV;
+ }
+
+ arm_bL_ops = ops;
+
+ set_switching_enabled(bL_switcher_get_enabled());
+
+ for (i = 0; i < MAX_CLUSTERS; i++)
+ mutex_init(&cluster_lock[i]);
+
+ 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 {
+ ret = __bLs_register_notifier();
+ if (ret) {
+ cpufreq_unregister_driver(&bL_cpufreq_driver);
+ arm_bL_ops = NULL;
+ } else {
+ pr_info("%s: Registered platform driver: %s\n",
+ __func__, ops->name);
+ }
+ }
+
+ bL_switcher_put_enabled();
+ return ret;
+}
+
+void bL_cpufreq_unregister(const 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;
+ }
+
+ bL_switcher_get_enabled();
+ __bLs_unregister_notifier();
+ cpufreq_unregister_driver(&bL_cpufreq_driver);
+ bL_switcher_put_enabled();
+ pr_info("%s: Un-registered platform driver: %s\n", __func__,
+ arm_bL_ops->name);
+ arm_bL_ops = NULL;
+}
static int ve_spc_init_opp_table(const struct cpumask *cpumask)
{
@@ -68,4 +697,7 @@ static struct platform_driver ve_spc_cpufreq_platdrv = {
};
module_platform_driver(ve_spc_cpufreq_platdrv);
-MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
+MODULE_DESCRIPTION("Vexpress SPC ARM big LITTLE cpufreq driver");
+MODULE_LICENSE("GPL v2");