#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 CLK_HW_DIV 2
#define LUT_TURBO_IND 1
+#define HZ_PER_KHZ 1000
+
struct qcom_cpufreq_soc_data {
u32 reg_enable;
u32 reg_freq_lut;
u32 reg_volt_lut;
+ u32 reg_current_vote;
u32 reg_perf_state;
u8 lut_row_size;
};
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;
+ bool cancel_throttle;
+ struct delayed_work throttle_work;
+ struct cpufreq_policy *policy;
};
static unsigned long cpu_hw_rate, xo_rate;
}
}
+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)
+{
+ unsigned long max_capacity, capacity, freq_hz, throttled_freq;
+ struct cpufreq_policy *policy = data->policy;
+ int cpu = cpumask_first(policy->cpus);
+ struct device *dev = get_cpu_device(cpu);
+ 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 */
+
+ max_capacity = arch_scale_cpu_capacity(cpu);
+ capacity = mult_frac(max_capacity, throttled_freq, policy->cpuinfo.max_freq);
+
+ /* Don't pass boost capacity to scheduler */
+ if (capacity > max_capacity)
+ capacity = max_capacity;
+
+ arch_set_thermal_pressure(policy->cpus, max_capacity - capacity);
+
+ /*
+ * 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);
+ qcom_lmh_dcvs_notify(c_data);
+
+ return 0;
+}
+
static const struct qcom_cpufreq_soc_data qcom_soc_data = {
.reg_enable = 0x0,
.reg_freq_lut = 0x110,
.reg_volt_lut = 0x114,
+ .reg_current_vote = 0x704,
.reg_perf_state = 0x920,
.lut_row_size = 32,
};
};
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();
+ char irq_name[15];
+ 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(pdev, index);
+ if (data->throttle_irq <= 0)
+ return data->throttle_irq == -EPROBE_DEFER ? -EPROBE_DEFER : 0;
+
+ data->cancel_throttle = false;
+ data->policy = policy;
+
+ mutex_init(&data->throttle_lock);
+ INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll);
+
+ snprintf(irq_name, sizeof(irq_name), "dcvsh-irq-%u", policy->cpu);
+ ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
+ IRQF_ONESHOT, irq_name, data);
+ if (ret) {
+ dev_err(&pdev->dev, "Error registering %s: %d\n", irq_name, ret);
+ return 0;
+ }
+
+ 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();
}
policy->driver_data = data;
+ policy->dvfs_possible_from_any_cpu = true;
ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
if (ret) {
goto error;
}
- dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
-
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);
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);
.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,
projects / linux-2.6-microblaze.git / blobdiff