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path: root/drivers/cpufreq/mediatek-cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/mediatek-cpufreq.c')
-rw-r--r--drivers/cpufreq/mediatek-cpufreq.c807
1 files changed, 807 insertions, 0 deletions
diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
new file mode 100644
index 000000000..fef68cb2b
--- /dev/null
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -0,0 +1,807 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015 Linaro Ltd.
+ * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
+ */
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/minmax.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/regulator/consumer.h>
+
+struct mtk_cpufreq_platform_data {
+ int min_volt_shift;
+ int max_volt_shift;
+ int proc_max_volt;
+ int sram_min_volt;
+ int sram_max_volt;
+ bool ccifreq_supported;
+};
+
+/*
+ * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS
+ * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in
+ * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two
+ * voltage inputs need to be controlled under a hardware limitation:
+ * 100mV < Vsram - Vproc < 200mV
+ *
+ * When scaling the clock frequency of a CPU clock domain, the clock source
+ * needs to be switched to another stable PLL clock temporarily until
+ * the original PLL becomes stable at target frequency.
+ */
+struct mtk_cpu_dvfs_info {
+ struct cpumask cpus;
+ struct device *cpu_dev;
+ struct device *cci_dev;
+ struct regulator *proc_reg;
+ struct regulator *sram_reg;
+ struct clk *cpu_clk;
+ struct clk *inter_clk;
+ struct list_head list_head;
+ int intermediate_voltage;
+ bool need_voltage_tracking;
+ int vproc_on_boot;
+ int pre_vproc;
+ /* Avoid race condition for regulators between notify and policy */
+ struct mutex reg_lock;
+ struct notifier_block opp_nb;
+ unsigned int opp_cpu;
+ unsigned long current_freq;
+ const struct mtk_cpufreq_platform_data *soc_data;
+ int vtrack_max;
+ bool ccifreq_bound;
+};
+
+static struct platform_device *cpufreq_pdev;
+
+static LIST_HEAD(dvfs_info_list);
+
+static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
+{
+ struct mtk_cpu_dvfs_info *info;
+
+ list_for_each_entry(info, &dvfs_info_list, list_head) {
+ if (cpumask_test_cpu(cpu, &info->cpus))
+ return info;
+ }
+
+ return NULL;
+}
+
+static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
+ int new_vproc)
+{
+ const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
+ struct regulator *proc_reg = info->proc_reg;
+ struct regulator *sram_reg = info->sram_reg;
+ int pre_vproc, pre_vsram, new_vsram, vsram, vproc, ret;
+ int retry = info->vtrack_max;
+
+ pre_vproc = regulator_get_voltage(proc_reg);
+ if (pre_vproc < 0) {
+ dev_err(info->cpu_dev,
+ "invalid Vproc value: %d\n", pre_vproc);
+ return pre_vproc;
+ }
+
+ pre_vsram = regulator_get_voltage(sram_reg);
+ if (pre_vsram < 0) {
+ dev_err(info->cpu_dev, "invalid Vsram value: %d\n", pre_vsram);
+ return pre_vsram;
+ }
+
+ new_vsram = clamp(new_vproc + soc_data->min_volt_shift,
+ soc_data->sram_min_volt, soc_data->sram_max_volt);
+
+ do {
+ if (pre_vproc <= new_vproc) {
+ vsram = clamp(pre_vproc + soc_data->max_volt_shift,
+ soc_data->sram_min_volt, new_vsram);
+ ret = regulator_set_voltage(sram_reg, vsram,
+ soc_data->sram_max_volt);
+
+ if (ret)
+ return ret;
+
+ if (vsram == soc_data->sram_max_volt ||
+ new_vsram == soc_data->sram_min_volt)
+ vproc = new_vproc;
+ else
+ vproc = vsram - soc_data->min_volt_shift;
+
+ ret = regulator_set_voltage(proc_reg, vproc,
+ soc_data->proc_max_volt);
+ if (ret) {
+ regulator_set_voltage(sram_reg, pre_vsram,
+ soc_data->sram_max_volt);
+ return ret;
+ }
+ } else if (pre_vproc > new_vproc) {
+ vproc = max(new_vproc,
+ pre_vsram - soc_data->max_volt_shift);
+ ret = regulator_set_voltage(proc_reg, vproc,
+ soc_data->proc_max_volt);
+ if (ret)
+ return ret;
+
+ if (vproc == new_vproc)
+ vsram = new_vsram;
+ else
+ vsram = max(new_vsram,
+ vproc + soc_data->min_volt_shift);
+
+ ret = regulator_set_voltage(sram_reg, vsram,
+ soc_data->sram_max_volt);
+ if (ret) {
+ regulator_set_voltage(proc_reg, pre_vproc,
+ soc_data->proc_max_volt);
+ return ret;
+ }
+ }
+
+ pre_vproc = vproc;
+ pre_vsram = vsram;
+
+ if (--retry < 0) {
+ dev_err(info->cpu_dev,
+ "over loop count, failed to set voltage\n");
+ return -EINVAL;
+ }
+ } while (vproc != new_vproc || vsram != new_vsram);
+
+ return 0;
+}
+
+static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)
+{
+ const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
+ int ret;
+
+ if (info->need_voltage_tracking)
+ ret = mtk_cpufreq_voltage_tracking(info, vproc);
+ else
+ ret = regulator_set_voltage(info->proc_reg, vproc,
+ soc_data->proc_max_volt);
+ if (!ret)
+ info->pre_vproc = vproc;
+
+ return ret;
+}
+
+static bool is_ccifreq_ready(struct mtk_cpu_dvfs_info *info)
+{
+ struct device_link *sup_link;
+
+ if (info->ccifreq_bound)
+ return true;
+
+ sup_link = device_link_add(info->cpu_dev, info->cci_dev,
+ DL_FLAG_AUTOREMOVE_CONSUMER);
+ if (!sup_link) {
+ dev_err(info->cpu_dev, "cpu%d: sup_link is NULL\n", info->opp_cpu);
+ return false;
+ }
+
+ if (sup_link->supplier->links.status != DL_DEV_DRIVER_BOUND)
+ return false;
+
+ info->ccifreq_bound = true;
+
+ return true;
+}
+
+static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ struct cpufreq_frequency_table *freq_table = policy->freq_table;
+ struct clk *cpu_clk = policy->clk;
+ struct clk *armpll = clk_get_parent(cpu_clk);
+ struct mtk_cpu_dvfs_info *info = policy->driver_data;
+ struct device *cpu_dev = info->cpu_dev;
+ struct dev_pm_opp *opp;
+ long freq_hz, pre_freq_hz;
+ int vproc, pre_vproc, inter_vproc, target_vproc, ret;
+
+ inter_vproc = info->intermediate_voltage;
+
+ pre_freq_hz = clk_get_rate(cpu_clk);
+
+ mutex_lock(&info->reg_lock);
+
+ if (unlikely(info->pre_vproc <= 0))
+ pre_vproc = regulator_get_voltage(info->proc_reg);
+ else
+ pre_vproc = info->pre_vproc;
+
+ if (pre_vproc < 0) {
+ dev_err(cpu_dev, "invalid Vproc value: %d\n", pre_vproc);
+ ret = pre_vproc;
+ goto out;
+ }
+
+ freq_hz = freq_table[index].frequency * 1000;
+
+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
+ if (IS_ERR(opp)) {
+ dev_err(cpu_dev, "cpu%d: failed to find OPP for %ld\n",
+ policy->cpu, freq_hz);
+ ret = PTR_ERR(opp);
+ goto out;
+ }
+ vproc = dev_pm_opp_get_voltage(opp);
+ dev_pm_opp_put(opp);
+
+ /*
+ * If MediaTek cci is supported but is not ready, we will use the value
+ * of max(target cpu voltage, booting voltage) to prevent high freqeuncy
+ * low voltage crash.
+ */
+ if (info->soc_data->ccifreq_supported && !is_ccifreq_ready(info))
+ vproc = max(vproc, info->vproc_on_boot);
+
+ /*
+ * If the new voltage or the intermediate voltage is higher than the
+ * current voltage, scale up voltage first.
+ */
+ target_vproc = max(inter_vproc, vproc);
+ if (pre_vproc <= target_vproc) {
+ ret = mtk_cpufreq_set_voltage(info, target_vproc);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to scale up voltage!\n", policy->cpu);
+ mtk_cpufreq_set_voltage(info, pre_vproc);
+ goto out;
+ }
+ }
+
+ /* Reparent the CPU clock to intermediate clock. */
+ ret = clk_set_parent(cpu_clk, info->inter_clk);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
+ mtk_cpufreq_set_voltage(info, pre_vproc);
+ goto out;
+ }
+
+ /* Set the original PLL to target rate. */
+ ret = clk_set_rate(armpll, freq_hz);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to scale cpu clock rate!\n", policy->cpu);
+ clk_set_parent(cpu_clk, armpll);
+ mtk_cpufreq_set_voltage(info, pre_vproc);
+ goto out;
+ }
+
+ /* Set parent of CPU clock back to the original PLL. */
+ ret = clk_set_parent(cpu_clk, armpll);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
+ mtk_cpufreq_set_voltage(info, inter_vproc);
+ goto out;
+ }
+
+ /*
+ * If the new voltage is lower than the intermediate voltage or the
+ * original voltage, scale down to the new voltage.
+ */
+ if (vproc < inter_vproc || vproc < pre_vproc) {
+ ret = mtk_cpufreq_set_voltage(info, vproc);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to scale down voltage!\n", policy->cpu);
+ clk_set_parent(cpu_clk, info->inter_clk);
+ clk_set_rate(armpll, pre_freq_hz);
+ clk_set_parent(cpu_clk, armpll);
+ goto out;
+ }
+ }
+
+ info->current_freq = freq_hz;
+
+out:
+ mutex_unlock(&info->reg_lock);
+
+ return ret;
+}
+
+#define DYNAMIC_POWER "dynamic-power-coefficient"
+
+static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct dev_pm_opp *opp = data;
+ struct dev_pm_opp *new_opp;
+ struct mtk_cpu_dvfs_info *info;
+ unsigned long freq, volt;
+ struct cpufreq_policy *policy;
+ int ret = 0;
+
+ info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
+
+ if (event == OPP_EVENT_ADJUST_VOLTAGE) {
+ freq = dev_pm_opp_get_freq(opp);
+
+ mutex_lock(&info->reg_lock);
+ if (info->current_freq == freq) {
+ volt = dev_pm_opp_get_voltage(opp);
+ ret = mtk_cpufreq_set_voltage(info, volt);
+ if (ret)
+ dev_err(info->cpu_dev,
+ "failed to scale voltage: %d\n", ret);
+ }
+ mutex_unlock(&info->reg_lock);
+ } else if (event == OPP_EVENT_DISABLE) {
+ freq = dev_pm_opp_get_freq(opp);
+
+ /* case of current opp item is disabled */
+ if (info->current_freq == freq) {
+ freq = 1;
+ new_opp = dev_pm_opp_find_freq_ceil(info->cpu_dev,
+ &freq);
+ if (IS_ERR(new_opp)) {
+ dev_err(info->cpu_dev,
+ "all opp items are disabled\n");
+ ret = PTR_ERR(new_opp);
+ return notifier_from_errno(ret);
+ }
+
+ dev_pm_opp_put(new_opp);
+ policy = cpufreq_cpu_get(info->opp_cpu);
+ if (policy) {
+ cpufreq_driver_target(policy, freq / 1000,
+ CPUFREQ_RELATION_L);
+ cpufreq_cpu_put(policy);
+ }
+ }
+ }
+
+ return notifier_from_errno(ret);
+}
+
+static struct device *of_get_cci(struct device *cpu_dev)
+{
+ struct device_node *np;
+ struct platform_device *pdev;
+
+ np = of_parse_phandle(cpu_dev->of_node, "mediatek,cci", 0);
+ if (!np)
+ return ERR_PTR(-ENODEV);
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev)
+ return ERR_PTR(-ENODEV);
+
+ return &pdev->dev;
+}
+
+static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
+{
+ struct device *cpu_dev;
+ struct dev_pm_opp *opp;
+ unsigned long rate;
+ int ret;
+
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev) {
+ dev_err(cpu_dev, "failed to get cpu%d device\n", cpu);
+ return -ENODEV;
+ }
+ info->cpu_dev = cpu_dev;
+
+ info->ccifreq_bound = false;
+ if (info->soc_data->ccifreq_supported) {
+ info->cci_dev = of_get_cci(info->cpu_dev);
+ if (IS_ERR(info->cci_dev)) {
+ ret = PTR_ERR(info->cci_dev);
+ dev_err(cpu_dev, "cpu%d: failed to get cci device\n", cpu);
+ return -ENODEV;
+ }
+ }
+
+ info->cpu_clk = clk_get(cpu_dev, "cpu");
+ if (IS_ERR(info->cpu_clk)) {
+ ret = PTR_ERR(info->cpu_clk);
+ return dev_err_probe(cpu_dev, ret,
+ "cpu%d: failed to get cpu clk\n", cpu);
+ }
+
+ info->inter_clk = clk_get(cpu_dev, "intermediate");
+ if (IS_ERR(info->inter_clk)) {
+ ret = PTR_ERR(info->inter_clk);
+ dev_err_probe(cpu_dev, ret,
+ "cpu%d: failed to get intermediate clk\n", cpu);
+ goto out_free_mux_clock;
+ }
+
+ info->proc_reg = regulator_get_optional(cpu_dev, "proc");
+ if (IS_ERR(info->proc_reg)) {
+ ret = PTR_ERR(info->proc_reg);
+ dev_err_probe(cpu_dev, ret,
+ "cpu%d: failed to get proc regulator\n", cpu);
+ goto out_free_inter_clock;
+ }
+
+ ret = regulator_enable(info->proc_reg);
+ if (ret) {
+ dev_warn(cpu_dev, "cpu%d: failed to enable vproc\n", cpu);
+ goto out_free_proc_reg;
+ }
+
+ /* Both presence and absence of sram regulator are valid cases. */
+ info->sram_reg = regulator_get_optional(cpu_dev, "sram");
+ if (IS_ERR(info->sram_reg)) {
+ ret = PTR_ERR(info->sram_reg);
+ if (ret == -EPROBE_DEFER)
+ goto out_disable_proc_reg;
+
+ info->sram_reg = NULL;
+ } else {
+ ret = regulator_enable(info->sram_reg);
+ if (ret) {
+ dev_warn(cpu_dev, "cpu%d: failed to enable vsram\n", cpu);
+ goto out_free_sram_reg;
+ }
+ }
+
+ /* Get OPP-sharing information from "operating-points-v2" bindings */
+ ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, &info->cpus);
+ if (ret) {
+ dev_err(cpu_dev,
+ "cpu%d: failed to get OPP-sharing information\n", cpu);
+ goto out_disable_sram_reg;
+ }
+
+ ret = dev_pm_opp_of_cpumask_add_table(&info->cpus);
+ if (ret) {
+ dev_warn(cpu_dev, "cpu%d: no OPP table\n", cpu);
+ goto out_disable_sram_reg;
+ }
+
+ ret = clk_prepare_enable(info->cpu_clk);
+ if (ret)
+ goto out_free_opp_table;
+
+ ret = clk_prepare_enable(info->inter_clk);
+ if (ret)
+ goto out_disable_mux_clock;
+
+ if (info->soc_data->ccifreq_supported) {
+ info->vproc_on_boot = regulator_get_voltage(info->proc_reg);
+ if (info->vproc_on_boot < 0) {
+ ret = info->vproc_on_boot;
+ dev_err(info->cpu_dev,
+ "invalid Vproc value: %d\n", info->vproc_on_boot);
+ goto out_disable_inter_clock;
+ }
+ }
+
+ /* Search a safe voltage for intermediate frequency. */
+ rate = clk_get_rate(info->inter_clk);
+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
+ if (IS_ERR(opp)) {
+ dev_err(cpu_dev, "cpu%d: failed to get intermediate opp\n", cpu);
+ ret = PTR_ERR(opp);
+ goto out_disable_inter_clock;
+ }
+ info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
+ dev_pm_opp_put(opp);
+
+ mutex_init(&info->reg_lock);
+ info->current_freq = clk_get_rate(info->cpu_clk);
+
+ info->opp_cpu = cpu;
+ info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
+ ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);
+ if (ret) {
+ dev_err(cpu_dev, "cpu%d: failed to register opp notifier\n", cpu);
+ goto out_disable_inter_clock;
+ }
+
+ /*
+ * If SRAM regulator is present, software "voltage tracking" is needed
+ * for this CPU power domain.
+ */
+ info->need_voltage_tracking = (info->sram_reg != NULL);
+
+ /*
+ * We assume min voltage is 0 and tracking target voltage using
+ * min_volt_shift for each iteration.
+ * The vtrack_max is 3 times of expeted iteration count.
+ */
+ info->vtrack_max = 3 * DIV_ROUND_UP(max(info->soc_data->sram_max_volt,
+ info->soc_data->proc_max_volt),
+ info->soc_data->min_volt_shift);
+
+ return 0;
+
+out_disable_inter_clock:
+ clk_disable_unprepare(info->inter_clk);
+
+out_disable_mux_clock:
+ clk_disable_unprepare(info->cpu_clk);
+
+out_free_opp_table:
+ dev_pm_opp_of_cpumask_remove_table(&info->cpus);
+
+out_disable_sram_reg:
+ if (info->sram_reg)
+ regulator_disable(info->sram_reg);
+
+out_free_sram_reg:
+ if (info->sram_reg)
+ regulator_put(info->sram_reg);
+
+out_disable_proc_reg:
+ regulator_disable(info->proc_reg);
+
+out_free_proc_reg:
+ regulator_put(info->proc_reg);
+
+out_free_inter_clock:
+ clk_put(info->inter_clk);
+
+out_free_mux_clock:
+ clk_put(info->cpu_clk);
+
+ return ret;
+}
+
+static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info)
+{
+ regulator_disable(info->proc_reg);
+ regulator_put(info->proc_reg);
+ if (info->sram_reg) {
+ regulator_disable(info->sram_reg);
+ regulator_put(info->sram_reg);
+ }
+ clk_disable_unprepare(info->cpu_clk);
+ clk_put(info->cpu_clk);
+ clk_disable_unprepare(info->inter_clk);
+ clk_put(info->inter_clk);
+ dev_pm_opp_of_cpumask_remove_table(&info->cpus);
+ dev_pm_opp_unregister_notifier(info->cpu_dev, &info->opp_nb);
+}
+
+static int mtk_cpufreq_init(struct cpufreq_policy *policy)
+{
+ struct mtk_cpu_dvfs_info *info;
+ struct cpufreq_frequency_table *freq_table;
+ int ret;
+
+ info = mtk_cpu_dvfs_info_lookup(policy->cpu);
+ if (!info) {
+ pr_err("dvfs info for cpu%d is not initialized.\n",
+ policy->cpu);
+ return -EINVAL;
+ }
+
+ ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table);
+ if (ret) {
+ dev_err(info->cpu_dev,
+ "failed to init cpufreq table for cpu%d: %d\n",
+ policy->cpu, ret);
+ return ret;
+ }
+
+ cpumask_copy(policy->cpus, &info->cpus);
+ policy->freq_table = freq_table;
+ policy->driver_data = info;
+ policy->clk = info->cpu_clk;
+
+ return 0;
+}
+
+static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ struct mtk_cpu_dvfs_info *info = policy->driver_data;
+
+ dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
+
+ return 0;
+}
+
+static struct cpufreq_driver mtk_cpufreq_driver = {
+ .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
+ CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
+ CPUFREQ_IS_COOLING_DEV,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = mtk_cpufreq_set_target,
+ .get = cpufreq_generic_get,
+ .init = mtk_cpufreq_init,
+ .exit = mtk_cpufreq_exit,
+ .register_em = cpufreq_register_em_with_opp,
+ .name = "mtk-cpufreq",
+ .attr = cpufreq_generic_attr,
+};
+
+static int mtk_cpufreq_probe(struct platform_device *pdev)
+{
+ const struct mtk_cpufreq_platform_data *data;
+ struct mtk_cpu_dvfs_info *info, *tmp;
+ int cpu, ret;
+
+ data = dev_get_platdata(&pdev->dev);
+ if (!data) {
+ dev_err(&pdev->dev,
+ "failed to get mtk cpufreq platform data\n");
+ return -ENODEV;
+ }
+
+ for_each_possible_cpu(cpu) {
+ info = mtk_cpu_dvfs_info_lookup(cpu);
+ if (info)
+ continue;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ ret = -ENOMEM;
+ goto release_dvfs_info_list;
+ }
+
+ info->soc_data = data;
+ ret = mtk_cpu_dvfs_info_init(info, cpu);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "failed to initialize dvfs info for cpu%d\n",
+ cpu);
+ goto release_dvfs_info_list;
+ }
+
+ list_add(&info->list_head, &dvfs_info_list);
+ }
+
+ ret = cpufreq_register_driver(&mtk_cpufreq_driver);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n");
+ goto release_dvfs_info_list;
+ }
+
+ return 0;
+
+release_dvfs_info_list:
+ list_for_each_entry_safe(info, tmp, &dvfs_info_list, list_head) {
+ mtk_cpu_dvfs_info_release(info);
+ list_del(&info->list_head);
+ }
+
+ return ret;
+}
+
+static struct platform_driver mtk_cpufreq_platdrv = {
+ .driver = {
+ .name = "mtk-cpufreq",
+ },
+ .probe = mtk_cpufreq_probe,
+};
+
+static const struct mtk_cpufreq_platform_data mt2701_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 200000,
+ .proc_max_volt = 1150000,
+ .sram_min_volt = 0,
+ .sram_max_volt = 1150000,
+ .ccifreq_supported = false,
+};
+
+static const struct mtk_cpufreq_platform_data mt7622_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 200000,
+ .proc_max_volt = 1350000,
+ .sram_min_volt = 0,
+ .sram_max_volt = 1350000,
+ .ccifreq_supported = false,
+};
+
+static const struct mtk_cpufreq_platform_data mt7623_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 200000,
+ .proc_max_volt = 1300000,
+ .ccifreq_supported = false,
+};
+
+static const struct mtk_cpufreq_platform_data mt8183_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 200000,
+ .proc_max_volt = 1150000,
+ .sram_min_volt = 0,
+ .sram_max_volt = 1150000,
+ .ccifreq_supported = true,
+};
+
+static const struct mtk_cpufreq_platform_data mt8186_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 250000,
+ .proc_max_volt = 1118750,
+ .sram_min_volt = 850000,
+ .sram_max_volt = 1118750,
+ .ccifreq_supported = true,
+};
+
+static const struct mtk_cpufreq_platform_data mt8516_platform_data = {
+ .min_volt_shift = 100000,
+ .max_volt_shift = 200000,
+ .proc_max_volt = 1310000,
+ .sram_min_volt = 0,
+ .sram_max_volt = 1310000,
+ .ccifreq_supported = false,
+};
+
+/* List of machines supported by this driver */
+static const struct of_device_id mtk_cpufreq_machines[] __initconst = {
+ { .compatible = "mediatek,mt2701", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt2712", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt7622", .data = &mt7622_platform_data },
+ { .compatible = "mediatek,mt7623", .data = &mt7623_platform_data },
+ { .compatible = "mediatek,mt8167", .data = &mt8516_platform_data },
+ { .compatible = "mediatek,mt817x", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt8173", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt8176", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt8183", .data = &mt8183_platform_data },
+ { .compatible = "mediatek,mt8186", .data = &mt8186_platform_data },
+ { .compatible = "mediatek,mt8365", .data = &mt2701_platform_data },
+ { .compatible = "mediatek,mt8516", .data = &mt8516_platform_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
+
+static int __init mtk_cpufreq_driver_init(void)
+{
+ struct device_node *np;
+ const struct of_device_id *match;
+ const struct mtk_cpufreq_platform_data *data;
+ int err;
+
+ np = of_find_node_by_path("/");
+ if (!np)
+ return -ENODEV;
+
+ match = of_match_node(mtk_cpufreq_machines, np);
+ of_node_put(np);
+ if (!match) {
+ pr_debug("Machine is not compatible with mtk-cpufreq\n");
+ return -ENODEV;
+ }
+ data = match->data;
+
+ err = platform_driver_register(&mtk_cpufreq_platdrv);
+ if (err)
+ return err;
+
+ /*
+ * Since there's no place to hold device registration code and no
+ * device tree based way to match cpufreq driver yet, both the driver
+ * and the device registration codes are put here to handle defer
+ * probing.
+ */
+ cpufreq_pdev = platform_device_register_data(NULL, "mtk-cpufreq", -1,
+ data, sizeof(*data));
+ if (IS_ERR(cpufreq_pdev)) {
+ pr_err("failed to register mtk-cpufreq platform device\n");
+ platform_driver_unregister(&mtk_cpufreq_platdrv);
+ return PTR_ERR(cpufreq_pdev);
+ }
+
+ return 0;
+}
+module_init(mtk_cpufreq_driver_init)
+
+static void __exit mtk_cpufreq_driver_exit(void)
+{
+ platform_device_unregister(cpufreq_pdev);
+ platform_driver_unregister(&mtk_cpufreq_platdrv);
+}
+module_exit(mtk_cpufreq_driver_exit)
+
+MODULE_DESCRIPTION("MediaTek CPUFreq driver");
+MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@linaro.org>");
+MODULE_LICENSE("GPL v2");