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OpenCloudOS-Kernel/drivers/cpufreq/qcom-cpufreq-hw.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/clk-provider.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.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/units.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 GT_IRQ_STATUS BIT(2)
#define MAX_FREQ_DOMAINS 4
struct qcom_cpufreq_soc_data {
u32 reg_enable;
u32 reg_domain_state;
u32 reg_dcvs_ctrl;
u32 reg_freq_lut;
u32 reg_volt_lut;
u32 reg_intr_clr;
u32 reg_current_vote;
u32 reg_perf_state;
u8 lut_row_size;
};
struct qcom_cpufreq_data {
void __iomem *base;
/*
* 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;
struct clk_hw cpu_clk;
bool per_core_dcvs;
};
static struct {
struct qcom_cpufreq_data *data;
const struct qcom_cpufreq_soc_data *soc_data;
} qcom_cpufreq;
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 = qcom_cpufreq.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 long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
{
unsigned int lval;
if (qcom_cpufreq.soc_data->reg_current_vote)
lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_current_vote) & 0x3ff;
else
lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_domain_state) & 0xff;
return lval * xo_rate;
}
/* Get the frequency requested by the cpufreq core for the CPU */
static unsigned int qcom_cpufreq_get_freq(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 = qcom_cpufreq.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_get(unsigned int cpu)
{
struct qcom_cpufreq_data *data;
struct cpufreq_policy *policy;
policy = cpufreq_cpu_get_raw(cpu);
if (!policy)
return 0;
data = policy->driver_data;
if (data->throttle_irq >= 0)
return qcom_lmh_get_throttle_freq(data) / HZ_PER_KHZ;
return qcom_cpufreq_get_freq(cpu);
}
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 = qcom_cpufreq.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 = qcom_cpufreq.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");
kfree(table);
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 void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
{
struct cpufreq_policy *policy = data->policy;
int cpu = cpumask_first(policy->related_cpus);
struct device *dev = get_cpu_device(cpu);
unsigned long freq_hz, throttled_freq;
struct dev_pm_opp *opp;
/*
* Get the h/w throttled frequency, normalize it using the
* registered opp table and use it to calculate thermal pressure.
*/
freq_hz = qcom_lmh_get_throttle_freq(data);
opp = dev_pm_opp_find_freq_floor(dev, &freq_hz);
if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE)
opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz);
if (IS_ERR(opp)) {
dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
} else {
dev_pm_opp_put(opp);
}
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_get_freq(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);
if (qcom_cpufreq.soc_data->reg_intr_clr)
writel_relaxed(GT_IRQ_STATUS,
c_data->base + qcom_cpufreq.soc_data->reg_intr_clr);
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_domain_state = 0x20,
.reg_dcvs_ctrl = 0xb0,
.reg_freq_lut = 0x100,
.reg_volt_lut = 0x200,
.reg_intr_clr = 0x308,
.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_and_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 int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
{
struct qcom_cpufreq_data *data = policy->driver_data;
struct platform_device *pdev = cpufreq_get_driver_data();
int ret;
if (data->throttle_irq <= 0)
return 0;
mutex_lock(&data->throttle_lock);
data->cancel_throttle = false;
mutex_unlock(&data->throttle_lock);
ret = irq_set_affinity_and_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 ret;
}
static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
{
struct qcom_cpufreq_data *data = policy->driver_data;
if (data->throttle_irq <= 0)
return 0;
mutex_lock(&data->throttle_lock);
data->cancel_throttle = true;
mutex_unlock(&data->throttle_lock);
cancel_delayed_work_sync(&data->throttle_work);
irq_set_affinity_and_hint(data->throttle_irq, NULL);
disable_irq_nosync(data->throttle_irq);
return 0;
}
static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
{
if (data->throttle_irq <= 0)
return;
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 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];
data = &qcom_cpufreq.data[index];
/* HW should be in enabled state to proceed */
if (!(readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_enable) & 0x1)) {
dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
return -ENODEV;
}
if (readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_dcvs_ctrl) & 0x1)
data->per_core_dcvs = true;
qcom_get_related_cpus(index, policy->cpus);
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);
return ret;
}
ret = dev_pm_opp_get_opp_count(cpu_dev);
if (ret <= 0) {
dev_err(cpu_dev, "Failed to add OPPs\n");
return -ENODEV;
}
if (policy_has_boost_freq(policy)) {
ret = cpufreq_enable_boost_support();
if (ret)
dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
}
return qcom_cpufreq_hw_lmh_init(policy, index);
}
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;
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);
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,
.online = qcom_cpufreq_hw_cpu_online,
.offline = qcom_cpufreq_hw_cpu_offline,
.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 unsigned long qcom_cpufreq_hw_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct qcom_cpufreq_data *data = container_of(hw, struct qcom_cpufreq_data, cpu_clk);
return qcom_lmh_get_throttle_freq(data);
}
static const struct clk_ops qcom_cpufreq_hw_clk_ops = {
.recalc_rate = qcom_cpufreq_hw_recalc_rate,
};
static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
{
struct clk_hw_onecell_data *clk_data;
struct device *dev = &pdev->dev;
struct device *cpu_dev;
struct clk *clk;
int ret, i, num_domains;
clk = clk_get(dev, "xo");
if (IS_ERR(clk))
return PTR_ERR(clk);
xo_rate = clk_get_rate(clk);
clk_put(clk);
clk = clk_get(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 dev_err_probe(dev, ret, "Failed to find icc paths\n");
for (num_domains = 0; num_domains < MAX_FREQ_DOMAINS; num_domains++)
if (!platform_get_resource(pdev, IORESOURCE_MEM, num_domains))
break;
qcom_cpufreq.data = devm_kzalloc(dev, sizeof(struct qcom_cpufreq_data) * num_domains,
GFP_KERNEL);
if (!qcom_cpufreq.data)
return -ENOMEM;
qcom_cpufreq.soc_data = of_device_get_match_data(dev);
if (!qcom_cpufreq.soc_data)
return -ENODEV;
clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, num_domains), GFP_KERNEL);
if (!clk_data)
return -ENOMEM;
clk_data->num = num_domains;
for (i = 0; i < num_domains; i++) {
struct qcom_cpufreq_data *data = &qcom_cpufreq.data[i];
struct clk_init_data clk_init = {};
void __iomem *base;
base = devm_platform_ioremap_resource(pdev, i);
if (IS_ERR(base)) {
dev_err(dev, "Failed to map resource index %d\n", i);
return PTR_ERR(base);
}
data->base = base;
/* Register CPU clock for each frequency domain */
clk_init.name = kasprintf(GFP_KERNEL, "qcom_cpufreq%d", i);
if (!clk_init.name)
return -ENOMEM;
clk_init.flags = CLK_GET_RATE_NOCACHE;
clk_init.ops = &qcom_cpufreq_hw_clk_ops;
data->cpu_clk.init = &clk_init;
ret = devm_clk_hw_register(dev, &data->cpu_clk);
if (ret < 0) {
dev_err(dev, "Failed to register clock %d: %d\n", i, ret);
kfree(clk_init.name);
return ret;
}
clk_data->hws[i] = &data->cpu_clk;
kfree(clk_init.name);
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
if (ret < 0) {
dev_err(dev, "Failed to add clock provider\n");
return ret;
}
ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
if (ret)
dev_err(dev, "CPUFreq HW driver failed to register\n");
else
dev_dbg(dev, "QCOM CPUFreq HW driver initialized\n");
return ret;
}
static void qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
{
cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
}
static struct platform_driver qcom_cpufreq_hw_driver = {
.probe = qcom_cpufreq_hw_driver_probe,
.remove_new = 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");
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