[CPUFREQ] EXYNOS: Make EXYNOS common cpufreq driver

To support various EXYNOS series SoCs commonly,
added exynos common structure.
exynos-cpufreq.c => EXYNOS series common cpufreq driver
exynos4210-cpufreq.c => EXYNOS4210 support cpufreq driver

Signed-off-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 296 insertions, 0 deletions

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
new file mode 100644
index 000000000000..24e4dd453fab
--- /dev/null
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * EXYNOS - CPU frequency scaling support for EXYNOS series
+ *
+ * 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.
+*/
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/regulator/consumer.h>
+#include <linux/cpufreq.h>
+#include <linux/suspend.h>
+#include <linux/reboot.h>
+
+#include <mach/map.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-mem.h>
+#include <mach/cpufreq.h>
+
+#include <plat/clock.h>
+#include <plat/pm.h>
+
+static struct exynos_dvfs_info *exynos_info;
+
+static struct regulator *arm_regulator;
+static struct cpufreq_freqs freqs;
+
+static unsigned int locking_frequency;
+static bool frequency_locked;
+static DEFINE_MUTEX(cpufreq_lock);
+
+int exynos_verify_speed(struct cpufreq_policy *policy)
+{
+        return cpufreq_frequency_table_verify(policy,
+                                              exynos_info->freq_table);
+}
+
+unsigned int exynos_getspeed(unsigned int cpu)
+{
+        return clk_get_rate(exynos_info->cpu_clk) / 1000;
+}
+
+static int exynos_target(struct cpufreq_policy *policy,
+                          unsigned int target_freq,
+                          unsigned int relation)
+{
+        unsigned int index, old_index;
+        unsigned int arm_volt, safe_arm_volt = 0;
+        int ret = 0;
+        struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
+        unsigned int *volt_table = exynos_info->volt_table;
+        unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
+
+        mutex_lock(&cpufreq_lock);
+
+        freqs.old = policy->cur;
+
+        if (frequency_locked && target_freq != locking_frequency) {
+                ret = -EAGAIN;
+                goto out;
+        }
+
+        if (cpufreq_frequency_table_target(policy, freq_table,
+                                           freqs.old, relation, &old_index)) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        if (cpufreq_frequency_table_target(policy, freq_table,
+                                           target_freq, relation, &index)) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        freqs.new = freq_table[index].frequency;
+        freqs.cpu = policy->cpu;
+
+        /*
+         * ARM clock source will be changed APLL to MPLL temporary
+         * To support this level, need to control regulator for
+         * required voltage level
+         */
+        if (exynos_info->need_apll_change != NULL) {
+                if (exynos_info->need_apll_change(old_index, index) &&
+                   (freq_table[index].frequency < mpll_freq_khz) &&
+                   (freq_table[old_index].frequency < mpll_freq_khz))
+                        safe_arm_volt = volt_table[exynos_info->pll_safe_idx];
+        }
+        arm_volt = volt_table[index];
+
+        cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+        /* When the new frequency is higher than current frequency */
+        if ((freqs.new > freqs.old) && !safe_arm_volt) {
+                /* Firstly, voltage up to increase frequency */
+                regulator_set_voltage(arm_regulator, arm_volt,
+                                arm_volt);
+        }
+
+        if (safe_arm_volt)
+                regulator_set_voltage(arm_regulator, safe_arm_volt,
+                                      safe_arm_volt);
+        if (freqs.new != freqs.old)
+                exynos_info->set_freq(old_index, index);
+
+        cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+        /* When the new frequency is lower than current frequency */
+        if ((freqs.new < freqs.old) ||
+           ((freqs.new > freqs.old) && safe_arm_volt)) {
+                /* down the voltage after frequency change */
+                regulator_set_voltage(arm_regulator, arm_volt,
+                                arm_volt);
+        }
+
+out:
+        mutex_unlock(&cpufreq_lock);
+
+        return ret;
+}
+
+#ifdef CONFIG_PM
+static int exynos_cpufreq_suspend(struct cpufreq_policy *policy)
+{
+        return 0;
+}
+
+static int exynos_cpufreq_resume(struct cpufreq_policy *policy)
+{
+        return 0;
+}
+#endif
+
+/**
+ * exynos_cpufreq_pm_notifier - block CPUFREQ's activities in suspend-resume
+ *                      context
+ * @notifier
+ * @pm_event
+ * @v
+ *
+ * While frequency_locked == true, target() ignores every frequency but
+ * locking_frequency. The locking_frequency value is the initial frequency,
+ * which is set by the bootloader. In order to eliminate possible
+ * inconsistency in clock values, we save and restore frequencies during
+ * suspend and resume and block CPUFREQ activities. Note that the standard
+ * suspend/resume cannot be used as they are too deep (syscore_ops) for
+ * regulator actions.
+ */
+static int exynos_cpufreq_pm_notifier(struct notifier_block *notifier,
+                                       unsigned long pm_event, void *v)
+{
+        struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
+        static unsigned int saved_frequency;
+        unsigned int temp;
+
+        mutex_lock(&cpufreq_lock);
+        switch (pm_event) {
+        case PM_SUSPEND_PREPARE:
+                if (frequency_locked)
+                        goto out;
+
+                frequency_locked = true;
+
+                if (locking_frequency) {
+                        saved_frequency = exynos_getspeed(0);
+
+                        mutex_unlock(&cpufreq_lock);
+                        exynos_target(policy, locking_frequency,
+                                      CPUFREQ_RELATION_H);
+                        mutex_lock(&cpufreq_lock);
+                }
+                break;
+
+        case PM_POST_SUSPEND:
+                if (saved_frequency) {
+                        /*
+                         * While frequency_locked, only locking_frequency
+                         * is valid for target(). In order to use
+                         * saved_frequency while keeping frequency_locked,
+                         * we temporarly overwrite locking_frequency.
+                         */
+                        temp = locking_frequency;
+                        locking_frequency = saved_frequency;
+
+                        mutex_unlock(&cpufreq_lock);
+                        exynos_target(policy, locking_frequency,
+                                      CPUFREQ_RELATION_H);
+                        mutex_lock(&cpufreq_lock);
+
+                        locking_frequency = temp;
+                }
+                frequency_locked = false;
+                break;
+        }
+out:
+        mutex_unlock(&cpufreq_lock);
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block exynos_cpufreq_nb = {
+        .notifier_call = exynos_cpufreq_pm_notifier,
+};
+
+static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+        policy->cur = policy->min = policy->max = exynos_getspeed(policy->cpu);
+
+        cpufreq_frequency_table_get_attr(exynos_info->freq_table, policy->cpu);
+
+        /* set the transition latency value */
+        policy->cpuinfo.transition_latency = 100000;
+
+        /*
+         * EXYNOS4 multi-core processors has 2 cores
+         * that the frequency cannot be set independently.
+         * Each cpu is bound to the same speed.
+         * So the affected cpu is all of the cpus.
+         */
+        if (num_online_cpus() == 1) {
+                cpumask_copy(policy->related_cpus, cpu_possible_mask);
+                cpumask_copy(policy->cpus, cpu_online_mask);
+        } else {
+                cpumask_setall(policy->cpus);
+        }
+
+        return cpufreq_frequency_table_cpuinfo(policy, exynos_info->freq_table);
+}
+
+static struct cpufreq_driver exynos_driver = {
+        .flags          = CPUFREQ_STICKY,
+        .verify         = exynos_verify_speed,
+        .target         = exynos_target,
+        .get            = exynos_getspeed,
+        .init           = exynos_cpufreq_cpu_init,
+        .name           = "exynos_cpufreq",
+#ifdef CONFIG_PM
+        .suspend        = exynos_cpufreq_suspend,
+        .resume         = exynos_cpufreq_resume,
+#endif
+};
+
+static int __init exynos_cpufreq_init(void)
+{
+        int ret = -EINVAL;
+
+        exynos_info = kzalloc(sizeof(struct exynos_dvfs_info), GFP_KERNEL);
+        if (!exynos_info)
+                return -ENOMEM;
+
+        if (soc_is_exynos4210())
+                ret = exynos4210_cpufreq_init(exynos_info);
+        else
+                pr_err("%s: CPU type not found\n", __func__);
+
+        if (ret)
+                goto err_vdd_arm;
+
+        if (exynos_info->set_freq == NULL) {
+                pr_err("%s: No set_freq function (ERR)\n", __func__);
+                goto err_vdd_arm;
+        }
+
+        arm_regulator = regulator_get(NULL, "vdd_arm");
+        if (IS_ERR(arm_regulator)) {
+                pr_err("%s: failed to get resource vdd_arm\n", __func__);
+                goto err_vdd_arm;
+        }
+
+        register_pm_notifier(&exynos_cpufreq_nb);
+
+        if (cpufreq_register_driver(&exynos_driver)) {
+                pr_err("%s: failed to register cpufreq driver\n", __func__);
+                goto err_cpufreq;
+        }
+
+        return 0;
+err_cpufreq:
+        unregister_pm_notifier(&exynos_cpufreq_nb);
+
+        if (!IS_ERR(arm_regulator))
+                regulator_put(arm_regulator);
+err_vdd_arm:
+        kfree(exynos_info);
+        pr_debug("%s: failed initialization\n", __func__);
+        return -EINVAL;
+}
+late_initcall(exynos_cpufreq_init);