| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2018, The Linux Foundation. All rights reserved. |
| */ |
| |
| #include <linux/bitfield.h> |
| #include <linux/cpufreq.h> |
| #include <linux/init.h> |
| #include <linux/interconnect.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of_address.h> |
| #include <linux/of_platform.h> |
| #include <linux/pm_opp.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| |
| #define LUT_MAX_ENTRIES 40U |
| #define LUT_SRC GENMASK(31, 30) |
| #define LUT_L_VAL GENMASK(7, 0) |
| #define LUT_CORE_COUNT GENMASK(18, 16) |
| #define LUT_VOLT GENMASK(11, 0) |
| #define CLK_HW_DIV 2 |
| #define LUT_TURBO_IND 1 |
| |
| #define HZ_PER_KHZ 1000 |
| |
| struct qcom_cpufreq_soc_data { |
| u32 reg_enable; |
| u32 reg_dcvs_ctrl; |
| u32 reg_freq_lut; |
| u32 reg_volt_lut; |
| u32 reg_current_vote; |
| u32 reg_perf_state; |
| u8 lut_row_size; |
| }; |
| |
| struct qcom_cpufreq_data { |
| void __iomem *base; |
| struct resource *res; |
| const struct qcom_cpufreq_soc_data *soc_data; |
| |
| /* |
| * Mutex to synchronize between de-init sequence and re-starting LMh |
| * polling/interrupts |
| */ |
| struct mutex throttle_lock; |
| int throttle_irq; |
| char irq_name[15]; |
| bool cancel_throttle; |
| struct delayed_work throttle_work; |
| struct cpufreq_policy *policy; |
| |
| bool per_core_dcvs; |
| }; |
| |
| static unsigned long cpu_hw_rate, xo_rate; |
| static bool icc_scaling_enabled; |
| |
| static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy, |
| unsigned long freq_khz) |
| { |
| unsigned long freq_hz = freq_khz * 1000; |
| struct dev_pm_opp *opp; |
| struct device *dev; |
| int ret; |
| |
| dev = get_cpu_device(policy->cpu); |
| if (!dev) |
| return -ENODEV; |
| |
| opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true); |
| if (IS_ERR(opp)) |
| return PTR_ERR(opp); |
| |
| ret = dev_pm_opp_set_opp(dev, opp); |
| dev_pm_opp_put(opp); |
| return ret; |
| } |
| |
| static int qcom_cpufreq_update_opp(struct device *cpu_dev, |
| unsigned long freq_khz, |
| unsigned long volt) |
| { |
| unsigned long freq_hz = freq_khz * 1000; |
| int ret; |
| |
| /* Skip voltage update if the opp table is not available */ |
| if (!icc_scaling_enabled) |
| return dev_pm_opp_add(cpu_dev, freq_hz, volt); |
| |
| ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt); |
| if (ret) { |
| dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz); |
| return ret; |
| } |
| |
| return dev_pm_opp_enable(cpu_dev, freq_hz); |
| } |
| |
| static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, |
| unsigned int index) |
| { |
| struct qcom_cpufreq_data *data = policy->driver_data; |
| const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; |
| unsigned long freq = policy->freq_table[index].frequency; |
| unsigned int i; |
| |
| writel_relaxed(index, data->base + soc_data->reg_perf_state); |
| |
| if (data->per_core_dcvs) |
| for (i = 1; i < cpumask_weight(policy->related_cpus); i++) |
| writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4); |
| |
| if (icc_scaling_enabled) |
| qcom_cpufreq_set_bw(policy, freq); |
| |
| return 0; |
| } |
| |
| static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) |
| { |
| struct qcom_cpufreq_data *data; |
| const struct qcom_cpufreq_soc_data *soc_data; |
| struct cpufreq_policy *policy; |
| unsigned int index; |
| |
| policy = cpufreq_cpu_get_raw(cpu); |
| if (!policy) |
| return 0; |
| |
| data = policy->driver_data; |
| soc_data = data->soc_data; |
| |
| index = readl_relaxed(data->base + soc_data->reg_perf_state); |
| index = min(index, LUT_MAX_ENTRIES - 1); |
| |
| return policy->freq_table[index].frequency; |
| } |
| |
| static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, |
| unsigned int target_freq) |
| { |
| struct qcom_cpufreq_data *data = policy->driver_data; |
| const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; |
| unsigned int index; |
| unsigned int i; |
| |
| index = policy->cached_resolved_idx; |
| writel_relaxed(index, data->base + soc_data->reg_perf_state); |
| |
| if (data->per_core_dcvs) |
| for (i = 1; i < cpumask_weight(policy->related_cpus); i++) |
| writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4); |
| |
| return policy->freq_table[index].frequency; |
| } |
| |
| static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev, |
| struct cpufreq_policy *policy) |
| { |
| u32 data, src, lval, i, core_count, prev_freq = 0, freq; |
| u32 volt; |
| struct cpufreq_frequency_table *table; |
| struct dev_pm_opp *opp; |
| unsigned long rate; |
| int ret; |
| struct qcom_cpufreq_data *drv_data = policy->driver_data; |
| const struct qcom_cpufreq_soc_data *soc_data = drv_data->soc_data; |
| |
| table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); |
| if (!table) |
| return -ENOMEM; |
| |
| ret = dev_pm_opp_of_add_table(cpu_dev); |
| if (!ret) { |
| /* Disable all opps and cross-validate against LUT later */ |
| icc_scaling_enabled = true; |
| for (rate = 0; ; rate++) { |
| opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate); |
| if (IS_ERR(opp)) |
| break; |
| |
| dev_pm_opp_put(opp); |
| dev_pm_opp_disable(cpu_dev, rate); |
| } |
| } else if (ret != -ENODEV) { |
| dev_err(cpu_dev, "Invalid opp table in device tree\n"); |
| return ret; |
| } else { |
| policy->fast_switch_possible = true; |
| icc_scaling_enabled = false; |
| } |
| |
| for (i = 0; i < LUT_MAX_ENTRIES; i++) { |
| data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut + |
| i * soc_data->lut_row_size); |
| src = FIELD_GET(LUT_SRC, data); |
| lval = FIELD_GET(LUT_L_VAL, data); |
| core_count = FIELD_GET(LUT_CORE_COUNT, data); |
| |
| data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut + |
| i * soc_data->lut_row_size); |
| volt = FIELD_GET(LUT_VOLT, data) * 1000; |
| |
| if (src) |
| freq = xo_rate * lval / 1000; |
| else |
| freq = cpu_hw_rate / 1000; |
| |
| if (freq != prev_freq && core_count != LUT_TURBO_IND) { |
| if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) { |
| table[i].frequency = freq; |
| dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i, |
| freq, core_count); |
| } else { |
| dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq); |
| table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| } |
| |
| } else if (core_count == LUT_TURBO_IND) { |
| table[i].frequency = CPUFREQ_ENTRY_INVALID; |
| } |
| |
| /* |
| * Two of the same frequencies with the same core counts means |
| * end of table |
| */ |
| if (i > 0 && prev_freq == freq) { |
| struct cpufreq_frequency_table *prev = &table[i - 1]; |
| |
| /* |
| * Only treat the last frequency that might be a boost |
| * as the boost frequency |
| */ |
| if (prev->frequency == CPUFREQ_ENTRY_INVALID) { |
| if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) { |
| prev->frequency = prev_freq; |
| prev->flags = CPUFREQ_BOOST_FREQ; |
| } else { |
| dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", |
| freq); |
| } |
| } |
| |
| break; |
| } |
| |
| prev_freq = freq; |
| } |
| |
| table[i].frequency = CPUFREQ_TABLE_END; |
| policy->freq_table = table; |
| dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); |
| |
| return 0; |
| } |
| |
| static void qcom_get_related_cpus(int index, struct cpumask *m) |
| { |
| struct device_node *cpu_np; |
| struct of_phandle_args args; |
| int cpu, ret; |
| |
| for_each_possible_cpu(cpu) { |
| cpu_np = of_cpu_device_node_get(cpu); |
| if (!cpu_np) |
| continue; |
| |
| ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", |
| "#freq-domain-cells", 0, |
| &args); |
| of_node_put(cpu_np); |
| if (ret < 0) |
| continue; |
| |
| if (index == args.args[0]) |
| cpumask_set_cpu(cpu, m); |
| } |
| } |
| |
| static unsigned int qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data) |
| { |
| unsigned int val = readl_relaxed(data->base + data->soc_data->reg_current_vote); |
| |
| return (val & 0x3FF) * 19200; |
| } |
| |
| static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) |
| { |
| struct cpufreq_policy *policy = data->policy; |
| int cpu = cpumask_first(policy->cpus); |
| struct device *dev = get_cpu_device(cpu); |
| unsigned long freq_hz, throttled_freq; |
| struct dev_pm_opp *opp; |
| unsigned int freq; |
| |
| /* |
| * Get the h/w throttled frequency, normalize it using the |
| * registered opp table and use it to calculate thermal pressure. |
| */ |
| freq = qcom_lmh_get_throttle_freq(data); |
| freq_hz = freq * HZ_PER_KHZ; |
| |
| opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); |
| if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) |
| dev_pm_opp_find_freq_ceil(dev, &freq_hz); |
| |
| throttled_freq = freq_hz / HZ_PER_KHZ; |
| |
| /* Update thermal pressure (the boost frequencies are accepted) */ |
| arch_update_thermal_pressure(policy->related_cpus, throttled_freq); |
| |
| /* |
| * In the unlikely case policy is unregistered do not enable |
| * polling or h/w interrupt |
| */ |
| mutex_lock(&data->throttle_lock); |
| if (data->cancel_throttle) |
| goto out; |
| |
| /* |
| * If h/w throttled frequency is higher than what cpufreq has requested |
| * for, then stop polling and switch back to interrupt mechanism. |
| */ |
| if (throttled_freq >= qcom_cpufreq_hw_get(cpu)) |
| enable_irq(data->throttle_irq); |
| else |
| mod_delayed_work(system_highpri_wq, &data->throttle_work, |
| msecs_to_jiffies(10)); |
| |
| out: |
| mutex_unlock(&data->throttle_lock); |
| } |
| |
| static void qcom_lmh_dcvs_poll(struct work_struct *work) |
| { |
| struct qcom_cpufreq_data *data; |
| |
| data = container_of(work, struct qcom_cpufreq_data, throttle_work.work); |
| qcom_lmh_dcvs_notify(data); |
| } |
| |
| static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) |
| { |
| struct qcom_cpufreq_data *c_data = data; |
| |
| /* Disable interrupt and enable polling */ |
| disable_irq_nosync(c_data->throttle_irq); |
| schedule_delayed_work(&c_data->throttle_work, 0); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static const struct qcom_cpufreq_soc_data qcom_soc_data = { |
| .reg_enable = 0x0, |
| .reg_dcvs_ctrl = 0xbc, |
| .reg_freq_lut = 0x110, |
| .reg_volt_lut = 0x114, |
| .reg_current_vote = 0x704, |
| .reg_perf_state = 0x920, |
| .lut_row_size = 32, |
| }; |
| |
| static const struct qcom_cpufreq_soc_data epss_soc_data = { |
| .reg_enable = 0x0, |
| .reg_dcvs_ctrl = 0xb0, |
| .reg_freq_lut = 0x100, |
| .reg_volt_lut = 0x200, |
| .reg_perf_state = 0x320, |
| .lut_row_size = 4, |
| }; |
| |
| static const struct of_device_id qcom_cpufreq_hw_match[] = { |
| { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data }, |
| { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); |
| |
| static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) |
| { |
| struct qcom_cpufreq_data *data = policy->driver_data; |
| struct platform_device *pdev = cpufreq_get_driver_data(); |
| int ret; |
| |
| /* |
| * Look for LMh interrupt. If no interrupt line is specified / |
| * if there is an error, allow cpufreq to be enabled as usual. |
| */ |
| data->throttle_irq = platform_get_irq_optional(pdev, index); |
| if (data->throttle_irq == -ENXIO) |
| return 0; |
| if (data->throttle_irq < 0) |
| return data->throttle_irq; |
| |
| data->cancel_throttle = false; |
| data->policy = policy; |
| |
| mutex_init(&data->throttle_lock); |
| INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll); |
| |
| snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu); |
| ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq, |
| IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data); |
| if (ret) { |
| dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret); |
| return 0; |
| } |
| |
| ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); |
| if (ret) |
| dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", |
| data->irq_name, data->throttle_irq); |
| |
| return 0; |
| } |
| |
| static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) |
| { |
| if (data->throttle_irq <= 0) |
| return; |
| |
| mutex_lock(&data->throttle_lock); |
| data->cancel_throttle = true; |
| mutex_unlock(&data->throttle_lock); |
| |
| cancel_delayed_work_sync(&data->throttle_work); |
| free_irq(data->throttle_irq, data); |
| } |
| |
| static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) |
| { |
| struct platform_device *pdev = cpufreq_get_driver_data(); |
| struct device *dev = &pdev->dev; |
| struct of_phandle_args args; |
| struct device_node *cpu_np; |
| struct device *cpu_dev; |
| struct resource *res; |
| void __iomem *base; |
| struct qcom_cpufreq_data *data; |
| int ret, index; |
| |
| 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; |
| } |
| |
| cpu_np = of_cpu_device_node_get(policy->cpu); |
| if (!cpu_np) |
| return -EINVAL; |
| |
| ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", |
| "#freq-domain-cells", 0, &args); |
| of_node_put(cpu_np); |
| if (ret) |
| return ret; |
| |
| index = args.args[0]; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, index); |
| if (!res) { |
| dev_err(dev, "failed to get mem resource %d\n", index); |
| return -ENODEV; |
| } |
| |
| if (!request_mem_region(res->start, resource_size(res), res->name)) { |
| dev_err(dev, "failed to request resource %pR\n", res); |
| return -EBUSY; |
| } |
| |
| base = ioremap(res->start, resource_size(res)); |
| if (!base) { |
| dev_err(dev, "failed to map resource %pR\n", res); |
| ret = -ENOMEM; |
| goto release_region; |
| } |
| |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) { |
| ret = -ENOMEM; |
| goto unmap_base; |
| } |
| |
| data->soc_data = of_device_get_match_data(&pdev->dev); |
| data->base = base; |
| data->res = res; |
| |
| /* HW should be in enabled state to proceed */ |
| if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) { |
| dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); |
| ret = -ENODEV; |
| goto error; |
| } |
| |
| if (readl_relaxed(base + data->soc_data->reg_dcvs_ctrl) & 0x1) |
| data->per_core_dcvs = true; |
| |
| qcom_get_related_cpus(index, policy->cpus); |
| if (cpumask_empty(policy->cpus)) { |
| dev_err(dev, "Domain-%d failed to get related CPUs\n", index); |
| ret = -ENOENT; |
| goto error; |
| } |
| |
| policy->driver_data = data; |
| policy->dvfs_possible_from_any_cpu = true; |
| |
| ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy); |
| if (ret) { |
| dev_err(dev, "Domain-%d failed to read LUT\n", index); |
| goto error; |
| } |
| |
| ret = dev_pm_opp_get_opp_count(cpu_dev); |
| if (ret <= 0) { |
| dev_err(cpu_dev, "Failed to add OPPs\n"); |
| ret = -ENODEV; |
| goto error; |
| } |
| |
| if (policy_has_boost_freq(policy)) { |
| ret = cpufreq_enable_boost_support(); |
| if (ret) |
| dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); |
| } |
| |
| ret = qcom_cpufreq_hw_lmh_init(policy, index); |
| if (ret) |
| goto error; |
| |
| return 0; |
| error: |
| kfree(data); |
| unmap_base: |
| iounmap(base); |
| release_region: |
| release_mem_region(res->start, resource_size(res)); |
| return ret; |
| } |
| |
| static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) |
| { |
| struct device *cpu_dev = get_cpu_device(policy->cpu); |
| struct qcom_cpufreq_data *data = policy->driver_data; |
| struct resource *res = data->res; |
| void __iomem *base = data->base; |
| |
| dev_pm_opp_remove_all_dynamic(cpu_dev); |
| dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); |
| qcom_cpufreq_hw_lmh_exit(data); |
| kfree(policy->freq_table); |
| kfree(data); |
| iounmap(base); |
| release_mem_region(res->start, resource_size(res)); |
| |
| return 0; |
| } |
| |
| static void qcom_cpufreq_ready(struct cpufreq_policy *policy) |
| { |
| struct qcom_cpufreq_data *data = policy->driver_data; |
| |
| if (data->throttle_irq >= 0) |
| enable_irq(data->throttle_irq); |
| } |
| |
| static struct freq_attr *qcom_cpufreq_hw_attr[] = { |
| &cpufreq_freq_attr_scaling_available_freqs, |
| &cpufreq_freq_attr_scaling_boost_freqs, |
| NULL |
| }; |
| |
| static struct cpufreq_driver cpufreq_qcom_hw_driver = { |
| .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK | |
| CPUFREQ_HAVE_GOVERNOR_PER_POLICY | |
| CPUFREQ_IS_COOLING_DEV, |
| .verify = cpufreq_generic_frequency_table_verify, |
| .target_index = qcom_cpufreq_hw_target_index, |
| .get = qcom_cpufreq_hw_get, |
| .init = qcom_cpufreq_hw_cpu_init, |
| .exit = qcom_cpufreq_hw_cpu_exit, |
| .register_em = cpufreq_register_em_with_opp, |
| .fast_switch = qcom_cpufreq_hw_fast_switch, |
| .name = "qcom-cpufreq-hw", |
| .attr = qcom_cpufreq_hw_attr, |
| .ready = qcom_cpufreq_ready, |
| }; |
| |
| static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) |
| { |
| struct device *cpu_dev; |
| struct clk *clk; |
| int ret; |
| |
| clk = clk_get(&pdev->dev, "xo"); |
| if (IS_ERR(clk)) |
| return PTR_ERR(clk); |
| |
| xo_rate = clk_get_rate(clk); |
| clk_put(clk); |
| |
| clk = clk_get(&pdev->dev, "alternate"); |
| if (IS_ERR(clk)) |
| return PTR_ERR(clk); |
| |
| cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; |
| clk_put(clk); |
| |
| cpufreq_qcom_hw_driver.driver_data = pdev; |
| |
| /* Check for optional interconnect paths on CPU0 */ |
| cpu_dev = get_cpu_device(0); |
| if (!cpu_dev) |
| return -EPROBE_DEFER; |
| |
| ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL); |
| if (ret) |
| return ret; |
| |
| ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); |
| if (ret) |
| dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); |
| else |
| dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); |
| |
| return ret; |
| } |
| |
| static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) |
| { |
| return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); |
| } |
| |
| static struct platform_driver qcom_cpufreq_hw_driver = { |
| .probe = qcom_cpufreq_hw_driver_probe, |
| .remove = qcom_cpufreq_hw_driver_remove, |
| .driver = { |
| .name = "qcom-cpufreq-hw", |
| .of_match_table = qcom_cpufreq_hw_match, |
| }, |
| }; |
| |
| static int __init qcom_cpufreq_hw_init(void) |
| { |
| return platform_driver_register(&qcom_cpufreq_hw_driver); |
| } |
| postcore_initcall(qcom_cpufreq_hw_init); |
| |
| static void __exit qcom_cpufreq_hw_exit(void) |
| { |
| platform_driver_unregister(&qcom_cpufreq_hw_driver); |
| } |
| module_exit(qcom_cpufreq_hw_exit); |
| |
| MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); |
| MODULE_LICENSE("GPL v2"); |