# DEVFREQ Drivers
obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o
obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o
-obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o
+obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o
# DEVFREQ Event Drivers
obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * A devfreq driver for NVIDIA Tegra SoCs
- *
- * Copyright (c) 2014 NVIDIA CORPORATION. All rights reserved.
- * Copyright (C) 2014 Google, Inc
- */
-
-#include <linux/clk.h>
-#include <linux/cpufreq.h>
-#include <linux/devfreq.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/platform_device.h>
-#include <linux/pm_opp.h>
-#include <linux/reset.h>
-
-#include "governor.h"
-
-#define ACTMON_GLB_STATUS 0x0
-#define ACTMON_GLB_PERIOD_CTRL 0x4
-
-#define ACTMON_DEV_CTRL 0x0
-#define ACTMON_DEV_CTRL_K_VAL_SHIFT 10
-#define ACTMON_DEV_CTRL_ENB_PERIODIC BIT(18)
-#define ACTMON_DEV_CTRL_AVG_BELOW_WMARK_EN BIT(20)
-#define ACTMON_DEV_CTRL_AVG_ABOVE_WMARK_EN BIT(21)
-#define ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_NUM_SHIFT 23
-#define ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_NUM_SHIFT 26
-#define ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN BIT(29)
-#define ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN BIT(30)
-#define ACTMON_DEV_CTRL_ENB BIT(31)
-
-#define ACTMON_DEV_UPPER_WMARK 0x4
-#define ACTMON_DEV_LOWER_WMARK 0x8
-#define ACTMON_DEV_INIT_AVG 0xc
-#define ACTMON_DEV_AVG_UPPER_WMARK 0x10
-#define ACTMON_DEV_AVG_LOWER_WMARK 0x14
-#define ACTMON_DEV_COUNT_WEIGHT 0x18
-#define ACTMON_DEV_AVG_COUNT 0x20
-#define ACTMON_DEV_INTR_STATUS 0x24
-
-#define ACTMON_INTR_STATUS_CLEAR 0xffffffff
-
-#define ACTMON_DEV_INTR_CONSECUTIVE_UPPER BIT(31)
-#define ACTMON_DEV_INTR_CONSECUTIVE_LOWER BIT(30)
-
-#define ACTMON_ABOVE_WMARK_WINDOW 1
-#define ACTMON_BELOW_WMARK_WINDOW 3
-#define ACTMON_BOOST_FREQ_STEP 16000
-
-/*
- * Activity counter is incremented every 256 memory transactions, and each
- * transaction takes 4 EMC clocks for Tegra124; So the COUNT_WEIGHT is
- * 4 * 256 = 1024.
- */
-#define ACTMON_COUNT_WEIGHT 0x400
-
-/*
- * ACTMON_AVERAGE_WINDOW_LOG2: default value for @DEV_CTRL_K_VAL, which
- * translates to 2 ^ (K_VAL + 1). ex: 2 ^ (6 + 1) = 128
- */
-#define ACTMON_AVERAGE_WINDOW_LOG2 6
-#define ACTMON_SAMPLING_PERIOD 12 /* ms */
-#define ACTMON_DEFAULT_AVG_BAND 6 /* 1/10 of % */
-
-#define KHZ 1000
-
-/* Assume that the bus is saturated if the utilization is 25% */
-#define BUS_SATURATION_RATIO 25
-
-/**
- * struct tegra_devfreq_device_config - configuration specific to an ACTMON
- * device
- *
- * Coefficients and thresholds are percentages unless otherwise noted
- */
-struct tegra_devfreq_device_config {
- u32 offset;
- u32 irq_mask;
-
- /* Factors applied to boost_freq every consecutive watermark breach */
- unsigned int boost_up_coeff;
- unsigned int boost_down_coeff;
-
- /* Define the watermark bounds when applied to the current avg */
- unsigned int boost_up_threshold;
- unsigned int boost_down_threshold;
-
- /*
- * Threshold of activity (cycles) below which the CPU frequency isn't
- * to be taken into account. This is to avoid increasing the EMC
- * frequency when the CPU is very busy but not accessing the bus often.
- */
- u32 avg_dependency_threshold;
-};
-
-enum tegra_actmon_device {
- MCALL = 0,
- MCCPU,
-};
-
-static struct tegra_devfreq_device_config actmon_device_configs[] = {
- {
- /* MCALL: All memory accesses (including from the CPUs) */
- .offset = 0x1c0,
- .irq_mask = 1 << 26,
- .boost_up_coeff = 200,
- .boost_down_coeff = 50,
- .boost_up_threshold = 60,
- .boost_down_threshold = 40,
- },
- {
- /* MCCPU: memory accesses from the CPUs */
- .offset = 0x200,
- .irq_mask = 1 << 25,
- .boost_up_coeff = 800,
- .boost_down_coeff = 90,
- .boost_up_threshold = 27,
- .boost_down_threshold = 10,
- .avg_dependency_threshold = 50000,
- },
-};
-
-/**
- * struct tegra_devfreq_device - state specific to an ACTMON device
- *
- * Frequencies are in kHz.
- */
-struct tegra_devfreq_device {
- const struct tegra_devfreq_device_config *config;
- void __iomem *regs;
-
- /* Average event count sampled in the last interrupt */
- u32 avg_count;
-
- /*
- * Extra frequency to increase the target by due to consecutive
- * watermark breaches.
- */
- unsigned long boost_freq;
-
- /* Optimal frequency calculated from the stats for this device */
- unsigned long target_freq;
-};
-
-struct tegra_devfreq {
- struct devfreq *devfreq;
-
- struct reset_control *reset;
- struct clk *clock;
- void __iomem *regs;
-
- struct clk *emc_clock;
- unsigned long max_freq;
- unsigned long cur_freq;
- struct notifier_block rate_change_nb;
-
- struct tegra_devfreq_device devices[ARRAY_SIZE(actmon_device_configs)];
-
- int irq;
-};
-
-struct tegra_actmon_emc_ratio {
- unsigned long cpu_freq;
- unsigned long emc_freq;
-};
-
-static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
- { 1400000, ULONG_MAX },
- { 1200000, 750000 },
- { 1100000, 600000 },
- { 1000000, 500000 },
- { 800000, 375000 },
- { 500000, 200000 },
- { 250000, 100000 },
-};
-
-static u32 actmon_readl(struct tegra_devfreq *tegra, u32 offset)
-{
- return readl_relaxed(tegra->regs + offset);
-}
-
-static void actmon_writel(struct tegra_devfreq *tegra, u32 val, u32 offset)
-{
- writel_relaxed(val, tegra->regs + offset);
-}
-
-static u32 device_readl(struct tegra_devfreq_device *dev, u32 offset)
-{
- return readl_relaxed(dev->regs + offset);
-}
-
-static void device_writel(struct tegra_devfreq_device *dev, u32 val,
- u32 offset)
-{
- writel_relaxed(val, dev->regs + offset);
-}
-
-static unsigned long do_percent(unsigned long val, unsigned int pct)
-{
- return val * pct / 100;
-}
-
-static void tegra_devfreq_update_avg_wmark(struct tegra_devfreq *tegra,
- struct tegra_devfreq_device *dev)
-{
- u32 avg = dev->avg_count;
- u32 avg_band_freq = tegra->max_freq * ACTMON_DEFAULT_AVG_BAND / KHZ;
- u32 band = avg_band_freq * ACTMON_SAMPLING_PERIOD;
-
- device_writel(dev, avg + band, ACTMON_DEV_AVG_UPPER_WMARK);
-
- avg = max(dev->avg_count, band);
- device_writel(dev, avg - band, ACTMON_DEV_AVG_LOWER_WMARK);
-}
-
-static void tegra_devfreq_update_wmark(struct tegra_devfreq *tegra,
- struct tegra_devfreq_device *dev)
-{
- u32 val = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
-
- device_writel(dev, do_percent(val, dev->config->boost_up_threshold),
- ACTMON_DEV_UPPER_WMARK);
-
- device_writel(dev, do_percent(val, dev->config->boost_down_threshold),
- ACTMON_DEV_LOWER_WMARK);
-}
-
-static void actmon_write_barrier(struct tegra_devfreq *tegra)
-{
- /* ensure the update has reached the ACTMON */
- readl(tegra->regs + ACTMON_GLB_STATUS);
-}
-
-static void actmon_isr_device(struct tegra_devfreq *tegra,
- struct tegra_devfreq_device *dev)
-{
- u32 intr_status, dev_ctrl;
-
- dev->avg_count = device_readl(dev, ACTMON_DEV_AVG_COUNT);
- tegra_devfreq_update_avg_wmark(tegra, dev);
-
- intr_status = device_readl(dev, ACTMON_DEV_INTR_STATUS);
- dev_ctrl = device_readl(dev, ACTMON_DEV_CTRL);
-
- if (intr_status & ACTMON_DEV_INTR_CONSECUTIVE_UPPER) {
- /*
- * new_boost = min(old_boost * up_coef + step, max_freq)
- */
- dev->boost_freq = do_percent(dev->boost_freq,
- dev->config->boost_up_coeff);
- dev->boost_freq += ACTMON_BOOST_FREQ_STEP;
-
- dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
-
- if (dev->boost_freq >= tegra->max_freq)
- dev->boost_freq = tegra->max_freq;
- else
- dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
- } else if (intr_status & ACTMON_DEV_INTR_CONSECUTIVE_LOWER) {
- /*
- * new_boost = old_boost * down_coef
- * or 0 if (old_boost * down_coef < step / 2)
- */
- dev->boost_freq = do_percent(dev->boost_freq,
- dev->config->boost_down_coeff);
-
- dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
-
- if (dev->boost_freq < (ACTMON_BOOST_FREQ_STEP >> 1))
- dev->boost_freq = 0;
- else
- dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
- }
-
- if (dev->config->avg_dependency_threshold) {
- if (dev->avg_count >= dev->config->avg_dependency_threshold)
- dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
- else if (dev->boost_freq == 0)
- dev_ctrl &= ~ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
- }
-
- device_writel(dev, dev_ctrl, ACTMON_DEV_CTRL);
-
- device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
-
- actmon_write_barrier(tegra);
-}
-
-static unsigned long actmon_cpu_to_emc_rate(struct tegra_devfreq *tegra,
- unsigned long cpu_freq)
-{
- unsigned int i;
- struct tegra_actmon_emc_ratio *ratio = actmon_emc_ratios;
-
- for (i = 0; i < ARRAY_SIZE(actmon_emc_ratios); i++, ratio++) {
- if (cpu_freq >= ratio->cpu_freq) {
- if (ratio->emc_freq >= tegra->max_freq)
- return tegra->max_freq;
- else
- return ratio->emc_freq;
- }
- }
-
- return 0;
-}
-
-static void actmon_update_target(struct tegra_devfreq *tegra,
- struct tegra_devfreq_device *dev)
-{
- unsigned long cpu_freq = 0;
- unsigned long static_cpu_emc_freq = 0;
- unsigned int avg_sustain_coef;
-
- if (dev->config->avg_dependency_threshold) {
- cpu_freq = cpufreq_get(0);
- static_cpu_emc_freq = actmon_cpu_to_emc_rate(tegra, cpu_freq);
- }
-
- dev->target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD;
- avg_sustain_coef = 100 * 100 / dev->config->boost_up_threshold;
- dev->target_freq = do_percent(dev->target_freq, avg_sustain_coef);
- dev->target_freq += dev->boost_freq;
-
- if (dev->avg_count >= dev->config->avg_dependency_threshold)
- dev->target_freq = max(dev->target_freq, static_cpu_emc_freq);
-}
-
-static irqreturn_t actmon_thread_isr(int irq, void *data)
-{
- struct tegra_devfreq *tegra = data;
- bool handled = false;
- unsigned int i;
- u32 val;
-
- mutex_lock(&tegra->devfreq->lock);
-
- val = actmon_readl(tegra, ACTMON_GLB_STATUS);
- for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
- if (val & tegra->devices[i].config->irq_mask) {
- actmon_isr_device(tegra, tegra->devices + i);
- handled = true;
- }
- }
-
- if (handled)
- update_devfreq(tegra->devfreq);
-
- mutex_unlock(&tegra->devfreq->lock);
-
- return handled ? IRQ_HANDLED : IRQ_NONE;
-}
-
-static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
- unsigned long action, void *ptr)
-{
- struct clk_notifier_data *data = ptr;
- struct tegra_devfreq *tegra;
- struct tegra_devfreq_device *dev;
- unsigned int i;
-
- if (action != POST_RATE_CHANGE)
- return NOTIFY_OK;
-
- tegra = container_of(nb, struct tegra_devfreq, rate_change_nb);
-
- tegra->cur_freq = data->new_rate / KHZ;
-
- for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
- dev = &tegra->devices[i];
-
- tegra_devfreq_update_wmark(tegra, dev);
- }
-
- actmon_write_barrier(tegra);
-
- return NOTIFY_OK;
-}
-
-static void tegra_actmon_configure_device(struct tegra_devfreq *tegra,
- struct tegra_devfreq_device *dev)
-{
- u32 val = 0;
-
- dev->target_freq = tegra->cur_freq;
-
- dev->avg_count = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
- device_writel(dev, dev->avg_count, ACTMON_DEV_INIT_AVG);
-
- tegra_devfreq_update_avg_wmark(tegra, dev);
- tegra_devfreq_update_wmark(tegra, dev);
-
- device_writel(dev, ACTMON_COUNT_WEIGHT, ACTMON_DEV_COUNT_WEIGHT);
- device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
-
- val |= ACTMON_DEV_CTRL_ENB_PERIODIC;
- val |= (ACTMON_AVERAGE_WINDOW_LOG2 - 1)
- << ACTMON_DEV_CTRL_K_VAL_SHIFT;
- val |= (ACTMON_BELOW_WMARK_WINDOW - 1)
- << ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_NUM_SHIFT;
- val |= (ACTMON_ABOVE_WMARK_WINDOW - 1)
- << ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_NUM_SHIFT;
- val |= ACTMON_DEV_CTRL_AVG_ABOVE_WMARK_EN;
- val |= ACTMON_DEV_CTRL_AVG_BELOW_WMARK_EN;
- val |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
- val |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
- val |= ACTMON_DEV_CTRL_ENB;
-
- device_writel(dev, val, ACTMON_DEV_CTRL);
-}
-
-static void tegra_actmon_start(struct tegra_devfreq *tegra)
-{
- unsigned int i;
-
- disable_irq(tegra->irq);
-
- actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
- ACTMON_GLB_PERIOD_CTRL);
-
- for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
- tegra_actmon_configure_device(tegra, &tegra->devices[i]);
-
- actmon_write_barrier(tegra);
-
- enable_irq(tegra->irq);
-}
-
-static void tegra_actmon_stop(struct tegra_devfreq *tegra)
-{
- unsigned int i;
-
- disable_irq(tegra->irq);
-
- for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
- device_writel(&tegra->devices[i], 0x00000000, ACTMON_DEV_CTRL);
- device_writel(&tegra->devices[i], ACTMON_INTR_STATUS_CLEAR,
- ACTMON_DEV_INTR_STATUS);
- }
-
- actmon_write_barrier(tegra);
-
- enable_irq(tegra->irq);
-}
-
-static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
- u32 flags)
-{
- struct tegra_devfreq *tegra = dev_get_drvdata(dev);
- struct devfreq *devfreq = tegra->devfreq;
- struct dev_pm_opp *opp;
- unsigned long rate;
- int err;
-
- opp = devfreq_recommended_opp(dev, freq, flags);
- if (IS_ERR(opp)) {
- dev_err(dev, "Failed to find opp for %lu Hz\n", *freq);
- return PTR_ERR(opp);
- }
- rate = dev_pm_opp_get_freq(opp);
- dev_pm_opp_put(opp);
-
- err = clk_set_min_rate(tegra->emc_clock, rate);
- if (err)
- return err;
-
- err = clk_set_rate(tegra->emc_clock, 0);
- if (err)
- goto restore_min_rate;
-
- return 0;
-
-restore_min_rate:
- clk_set_min_rate(tegra->emc_clock, devfreq->previous_freq);
-
- return err;
-}
-
-static int tegra_devfreq_get_dev_status(struct device *dev,
- struct devfreq_dev_status *stat)
-{
- struct tegra_devfreq *tegra = dev_get_drvdata(dev);
- struct tegra_devfreq_device *actmon_dev;
- unsigned long cur_freq;
-
- cur_freq = READ_ONCE(tegra->cur_freq);
-
- /* To be used by the tegra governor */
- stat->private_data = tegra;
-
- /* The below are to be used by the other governors */
- stat->current_frequency = cur_freq * KHZ;
-
- actmon_dev = &tegra->devices[MCALL];
-
- /* Number of cycles spent on memory access */
- stat->busy_time = device_readl(actmon_dev, ACTMON_DEV_AVG_COUNT);
-
- /* The bus can be considered to be saturated way before 100% */
- stat->busy_time *= 100 / BUS_SATURATION_RATIO;
-
- /* Number of cycles in a sampling period */
- stat->total_time = ACTMON_SAMPLING_PERIOD * cur_freq;
-
- stat->busy_time = min(stat->busy_time, stat->total_time);
-
- return 0;
-}
-
-static struct devfreq_dev_profile tegra_devfreq_profile = {
- .polling_ms = 0,
- .target = tegra_devfreq_target,
- .get_dev_status = tegra_devfreq_get_dev_status,
-};
-
-static int tegra_governor_get_target(struct devfreq *devfreq,
- unsigned long *freq)
-{
- struct devfreq_dev_status *stat;
- struct tegra_devfreq *tegra;
- struct tegra_devfreq_device *dev;
- unsigned long target_freq = 0;
- unsigned int i;
- int err;
-
- err = devfreq_update_stats(devfreq);
- if (err)
- return err;
-
- stat = &devfreq->last_status;
-
- tegra = stat->private_data;
-
- for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
- dev = &tegra->devices[i];
-
- actmon_update_target(tegra, dev);
-
- target_freq = max(target_freq, dev->target_freq);
- }
-
- *freq = target_freq * KHZ;
-
- return 0;
-}
-
-static int tegra_governor_event_handler(struct devfreq *devfreq,
- unsigned int event, void *data)
-{
- struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
-
- switch (event) {
- case DEVFREQ_GOV_START:
- devfreq_monitor_start(devfreq);
- tegra_actmon_start(tegra);
- break;
-
- case DEVFREQ_GOV_STOP:
- tegra_actmon_stop(tegra);
- devfreq_monitor_stop(devfreq);
- break;
-
- case DEVFREQ_GOV_SUSPEND:
- tegra_actmon_stop(tegra);
- devfreq_monitor_suspend(devfreq);
- break;
-
- case DEVFREQ_GOV_RESUME:
- devfreq_monitor_resume(devfreq);
- tegra_actmon_start(tegra);
- break;
- }
-
- return 0;
-}
-
-static struct devfreq_governor tegra_devfreq_governor = {
- .name = "tegra_actmon",
- .get_target_freq = tegra_governor_get_target,
- .event_handler = tegra_governor_event_handler,
- .immutable = true,
-};
-
-static int tegra_devfreq_probe(struct platform_device *pdev)
-{
- struct tegra_devfreq *tegra;
- struct tegra_devfreq_device *dev;
- unsigned int i;
- unsigned long rate;
- int err;
-
- tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
- if (!tegra)
- return -ENOMEM;
-
- tegra->regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(tegra->regs))
- return PTR_ERR(tegra->regs);
-
- tegra->reset = devm_reset_control_get(&pdev->dev, "actmon");
- if (IS_ERR(tegra->reset)) {
- dev_err(&pdev->dev, "Failed to get reset\n");
- return PTR_ERR(tegra->reset);
- }
-
- tegra->clock = devm_clk_get(&pdev->dev, "actmon");
- if (IS_ERR(tegra->clock)) {
- dev_err(&pdev->dev, "Failed to get actmon clock\n");
- return PTR_ERR(tegra->clock);
- }
-
- tegra->emc_clock = devm_clk_get(&pdev->dev, "emc");
- if (IS_ERR(tegra->emc_clock)) {
- dev_err(&pdev->dev, "Failed to get emc clock\n");
- return PTR_ERR(tegra->emc_clock);
- }
-
- tegra->irq = platform_get_irq(pdev, 0);
- if (tegra->irq < 0) {
- err = tegra->irq;
- dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err);
- return err;
- }
-
- reset_control_assert(tegra->reset);
-
- err = clk_prepare_enable(tegra->clock);
- if (err) {
- dev_err(&pdev->dev,
- "Failed to prepare and enable ACTMON clock\n");
- return err;
- }
-
- reset_control_deassert(tegra->reset);
-
- tegra->max_freq = clk_round_rate(tegra->emc_clock, ULONG_MAX) / KHZ;
- tegra->cur_freq = clk_get_rate(tegra->emc_clock) / KHZ;
-
- for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) {
- dev = tegra->devices + i;
- dev->config = actmon_device_configs + i;
- dev->regs = tegra->regs + dev->config->offset;
- }
-
- for (rate = 0; rate <= tegra->max_freq * KHZ; rate++) {
- rate = clk_round_rate(tegra->emc_clock, rate);
-
- err = dev_pm_opp_add(&pdev->dev, rate, 0);
- if (err) {
- dev_err(&pdev->dev, "Failed to add OPP: %d\n", err);
- goto remove_opps;
- }
- }
-
- platform_set_drvdata(pdev, tegra);
-
- tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb;
- err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb);
- if (err) {
- dev_err(&pdev->dev,
- "Failed to register rate change notifier\n");
- goto remove_opps;
- }
-
- err = devfreq_add_governor(&tegra_devfreq_governor);
- if (err) {
- dev_err(&pdev->dev, "Failed to add governor: %d\n", err);
- goto unreg_notifier;
- }
-
- tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
- tegra->devfreq = devfreq_add_device(&pdev->dev,
- &tegra_devfreq_profile,
- "tegra_actmon",
- NULL);
- if (IS_ERR(tegra->devfreq)) {
- err = PTR_ERR(tegra->devfreq);
- goto remove_governor;
- }
-
- err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
- actmon_thread_isr, IRQF_ONESHOT,
- "tegra-devfreq", tegra);
- if (err) {
- dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
- goto remove_devfreq;
- }
-
- return 0;
-
-remove_devfreq:
- devfreq_remove_device(tegra->devfreq);
-
-remove_governor:
- devfreq_remove_governor(&tegra_devfreq_governor);
-
-unreg_notifier:
- clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
-
-remove_opps:
- dev_pm_opp_remove_all_dynamic(&pdev->dev);
-
- reset_control_reset(tegra->reset);
- clk_disable_unprepare(tegra->clock);
-
- return err;
-}
-
-static int tegra_devfreq_remove(struct platform_device *pdev)
-{
- struct tegra_devfreq *tegra = platform_get_drvdata(pdev);
-
- devfreq_remove_device(tegra->devfreq);
- devfreq_remove_governor(&tegra_devfreq_governor);
-
- clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
- dev_pm_opp_remove_all_dynamic(&pdev->dev);
-
- reset_control_reset(tegra->reset);
- clk_disable_unprepare(tegra->clock);
-
- return 0;
-}
-
-static const struct of_device_id tegra_devfreq_of_match[] = {
- { .compatible = "nvidia,tegra30-actmon" },
- { .compatible = "nvidia,tegra124-actmon" },
- { },
-};
-
-MODULE_DEVICE_TABLE(of, tegra_devfreq_of_match);
-
-static struct platform_driver tegra_devfreq_driver = {
- .probe = tegra_devfreq_probe,
- .remove = tegra_devfreq_remove,
- .driver = {
- .name = "tegra-devfreq",
- .of_match_table = tegra_devfreq_of_match,
- },
-};
-module_platform_driver(tegra_devfreq_driver);
-
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Tegra devfreq driver");
-MODULE_AUTHOR("Tomeu Vizoso <tomeu.vizoso@collabora.com>");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * A devfreq driver for NVIDIA Tegra SoCs
+ *
+ * Copyright (c) 2014 NVIDIA CORPORATION. All rights reserved.
+ * Copyright (C) 2014 Google, Inc
+ */
+
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/devfreq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/reset.h>
+
+#include "governor.h"
+
+#define ACTMON_GLB_STATUS 0x0
+#define ACTMON_GLB_PERIOD_CTRL 0x4
+
+#define ACTMON_DEV_CTRL 0x0
+#define ACTMON_DEV_CTRL_K_VAL_SHIFT 10
+#define ACTMON_DEV_CTRL_ENB_PERIODIC BIT(18)
+#define ACTMON_DEV_CTRL_AVG_BELOW_WMARK_EN BIT(20)
+#define ACTMON_DEV_CTRL_AVG_ABOVE_WMARK_EN BIT(21)
+#define ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_NUM_SHIFT 23
+#define ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_NUM_SHIFT 26
+#define ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN BIT(29)
+#define ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN BIT(30)
+#define ACTMON_DEV_CTRL_ENB BIT(31)
+
+#define ACTMON_DEV_UPPER_WMARK 0x4
+#define ACTMON_DEV_LOWER_WMARK 0x8
+#define ACTMON_DEV_INIT_AVG 0xc
+#define ACTMON_DEV_AVG_UPPER_WMARK 0x10
+#define ACTMON_DEV_AVG_LOWER_WMARK 0x14
+#define ACTMON_DEV_COUNT_WEIGHT 0x18
+#define ACTMON_DEV_AVG_COUNT 0x20
+#define ACTMON_DEV_INTR_STATUS 0x24
+
+#define ACTMON_INTR_STATUS_CLEAR 0xffffffff
+
+#define ACTMON_DEV_INTR_CONSECUTIVE_UPPER BIT(31)
+#define ACTMON_DEV_INTR_CONSECUTIVE_LOWER BIT(30)
+
+#define ACTMON_ABOVE_WMARK_WINDOW 1
+#define ACTMON_BELOW_WMARK_WINDOW 3
+#define ACTMON_BOOST_FREQ_STEP 16000
+
+/*
+ * Activity counter is incremented every 256 memory transactions, and each
+ * transaction takes 4 EMC clocks for Tegra124; So the COUNT_WEIGHT is
+ * 4 * 256 = 1024.
+ */
+#define ACTMON_COUNT_WEIGHT 0x400
+
+/*
+ * ACTMON_AVERAGE_WINDOW_LOG2: default value for @DEV_CTRL_K_VAL, which
+ * translates to 2 ^ (K_VAL + 1). ex: 2 ^ (6 + 1) = 128
+ */
+#define ACTMON_AVERAGE_WINDOW_LOG2 6
+#define ACTMON_SAMPLING_PERIOD 12 /* ms */
+#define ACTMON_DEFAULT_AVG_BAND 6 /* 1/10 of % */
+
+#define KHZ 1000
+
+/* Assume that the bus is saturated if the utilization is 25% */
+#define BUS_SATURATION_RATIO 25
+
+/**
+ * struct tegra_devfreq_device_config - configuration specific to an ACTMON
+ * device
+ *
+ * Coefficients and thresholds are percentages unless otherwise noted
+ */
+struct tegra_devfreq_device_config {
+ u32 offset;
+ u32 irq_mask;
+
+ /* Factors applied to boost_freq every consecutive watermark breach */
+ unsigned int boost_up_coeff;
+ unsigned int boost_down_coeff;
+
+ /* Define the watermark bounds when applied to the current avg */
+ unsigned int boost_up_threshold;
+ unsigned int boost_down_threshold;
+
+ /*
+ * Threshold of activity (cycles) below which the CPU frequency isn't
+ * to be taken into account. This is to avoid increasing the EMC
+ * frequency when the CPU is very busy but not accessing the bus often.
+ */
+ u32 avg_dependency_threshold;
+};
+
+enum tegra_actmon_device {
+ MCALL = 0,
+ MCCPU,
+};
+
+static struct tegra_devfreq_device_config actmon_device_configs[] = {
+ {
+ /* MCALL: All memory accesses (including from the CPUs) */
+ .offset = 0x1c0,
+ .irq_mask = 1 << 26,
+ .boost_up_coeff = 200,
+ .boost_down_coeff = 50,
+ .boost_up_threshold = 60,
+ .boost_down_threshold = 40,
+ },
+ {
+ /* MCCPU: memory accesses from the CPUs */
+ .offset = 0x200,
+ .irq_mask = 1 << 25,
+ .boost_up_coeff = 800,
+ .boost_down_coeff = 90,
+ .boost_up_threshold = 27,
+ .boost_down_threshold = 10,
+ .avg_dependency_threshold = 50000,
+ },
+};
+
+/**
+ * struct tegra_devfreq_device - state specific to an ACTMON device
+ *
+ * Frequencies are in kHz.
+ */
+struct tegra_devfreq_device {
+ const struct tegra_devfreq_device_config *config;
+ void __iomem *regs;
+
+ /* Average event count sampled in the last interrupt */
+ u32 avg_count;
+
+ /*
+ * Extra frequency to increase the target by due to consecutive
+ * watermark breaches.
+ */
+ unsigned long boost_freq;
+
+ /* Optimal frequency calculated from the stats for this device */
+ unsigned long target_freq;
+};
+
+struct tegra_devfreq {
+ struct devfreq *devfreq;
+
+ struct reset_control *reset;
+ struct clk *clock;
+ void __iomem *regs;
+
+ struct clk *emc_clock;
+ unsigned long max_freq;
+ unsigned long cur_freq;
+ struct notifier_block rate_change_nb;
+
+ struct tegra_devfreq_device devices[ARRAY_SIZE(actmon_device_configs)];
+
+ int irq;
+};
+
+struct tegra_actmon_emc_ratio {
+ unsigned long cpu_freq;
+ unsigned long emc_freq;
+};
+
+static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
+ { 1400000, ULONG_MAX },
+ { 1200000, 750000 },
+ { 1100000, 600000 },
+ { 1000000, 500000 },
+ { 800000, 375000 },
+ { 500000, 200000 },
+ { 250000, 100000 },
+};
+
+static u32 actmon_readl(struct tegra_devfreq *tegra, u32 offset)
+{
+ return readl_relaxed(tegra->regs + offset);
+}
+
+static void actmon_writel(struct tegra_devfreq *tegra, u32 val, u32 offset)
+{
+ writel_relaxed(val, tegra->regs + offset);
+}
+
+static u32 device_readl(struct tegra_devfreq_device *dev, u32 offset)
+{
+ return readl_relaxed(dev->regs + offset);
+}
+
+static void device_writel(struct tegra_devfreq_device *dev, u32 val,
+ u32 offset)
+{
+ writel_relaxed(val, dev->regs + offset);
+}
+
+static unsigned long do_percent(unsigned long val, unsigned int pct)
+{
+ return val * pct / 100;
+}
+
+static void tegra_devfreq_update_avg_wmark(struct tegra_devfreq *tegra,
+ struct tegra_devfreq_device *dev)
+{
+ u32 avg = dev->avg_count;
+ u32 avg_band_freq = tegra->max_freq * ACTMON_DEFAULT_AVG_BAND / KHZ;
+ u32 band = avg_band_freq * ACTMON_SAMPLING_PERIOD;
+
+ device_writel(dev, avg + band, ACTMON_DEV_AVG_UPPER_WMARK);
+
+ avg = max(dev->avg_count, band);
+ device_writel(dev, avg - band, ACTMON_DEV_AVG_LOWER_WMARK);
+}
+
+static void tegra_devfreq_update_wmark(struct tegra_devfreq *tegra,
+ struct tegra_devfreq_device *dev)
+{
+ u32 val = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
+
+ device_writel(dev, do_percent(val, dev->config->boost_up_threshold),
+ ACTMON_DEV_UPPER_WMARK);
+
+ device_writel(dev, do_percent(val, dev->config->boost_down_threshold),
+ ACTMON_DEV_LOWER_WMARK);
+}
+
+static void actmon_write_barrier(struct tegra_devfreq *tegra)
+{
+ /* ensure the update has reached the ACTMON */
+ readl(tegra->regs + ACTMON_GLB_STATUS);
+}
+
+static void actmon_isr_device(struct tegra_devfreq *tegra,
+ struct tegra_devfreq_device *dev)
+{
+ u32 intr_status, dev_ctrl;
+
+ dev->avg_count = device_readl(dev, ACTMON_DEV_AVG_COUNT);
+ tegra_devfreq_update_avg_wmark(tegra, dev);
+
+ intr_status = device_readl(dev, ACTMON_DEV_INTR_STATUS);
+ dev_ctrl = device_readl(dev, ACTMON_DEV_CTRL);
+
+ if (intr_status & ACTMON_DEV_INTR_CONSECUTIVE_UPPER) {
+ /*
+ * new_boost = min(old_boost * up_coef + step, max_freq)
+ */
+ dev->boost_freq = do_percent(dev->boost_freq,
+ dev->config->boost_up_coeff);
+ dev->boost_freq += ACTMON_BOOST_FREQ_STEP;
+
+ dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
+
+ if (dev->boost_freq >= tegra->max_freq)
+ dev->boost_freq = tegra->max_freq;
+ else
+ dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
+ } else if (intr_status & ACTMON_DEV_INTR_CONSECUTIVE_LOWER) {
+ /*
+ * new_boost = old_boost * down_coef
+ * or 0 if (old_boost * down_coef < step / 2)
+ */
+ dev->boost_freq = do_percent(dev->boost_freq,
+ dev->config->boost_down_coeff);
+
+ dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
+
+ if (dev->boost_freq < (ACTMON_BOOST_FREQ_STEP >> 1))
+ dev->boost_freq = 0;
+ else
+ dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
+ }
+
+ if (dev->config->avg_dependency_threshold) {
+ if (dev->avg_count >= dev->config->avg_dependency_threshold)
+ dev_ctrl |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
+ else if (dev->boost_freq == 0)
+ dev_ctrl &= ~ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
+ }
+
+ device_writel(dev, dev_ctrl, ACTMON_DEV_CTRL);
+
+ device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
+
+ actmon_write_barrier(tegra);
+}
+
+static unsigned long actmon_cpu_to_emc_rate(struct tegra_devfreq *tegra,
+ unsigned long cpu_freq)
+{
+ unsigned int i;
+ struct tegra_actmon_emc_ratio *ratio = actmon_emc_ratios;
+
+ for (i = 0; i < ARRAY_SIZE(actmon_emc_ratios); i++, ratio++) {
+ if (cpu_freq >= ratio->cpu_freq) {
+ if (ratio->emc_freq >= tegra->max_freq)
+ return tegra->max_freq;
+ else
+ return ratio->emc_freq;
+ }
+ }
+
+ return 0;
+}
+
+static void actmon_update_target(struct tegra_devfreq *tegra,
+ struct tegra_devfreq_device *dev)
+{
+ unsigned long cpu_freq = 0;
+ unsigned long static_cpu_emc_freq = 0;
+ unsigned int avg_sustain_coef;
+
+ if (dev->config->avg_dependency_threshold) {
+ cpu_freq = cpufreq_get(0);
+ static_cpu_emc_freq = actmon_cpu_to_emc_rate(tegra, cpu_freq);
+ }
+
+ dev->target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD;
+ avg_sustain_coef = 100 * 100 / dev->config->boost_up_threshold;
+ dev->target_freq = do_percent(dev->target_freq, avg_sustain_coef);
+ dev->target_freq += dev->boost_freq;
+
+ if (dev->avg_count >= dev->config->avg_dependency_threshold)
+ dev->target_freq = max(dev->target_freq, static_cpu_emc_freq);
+}
+
+static irqreturn_t actmon_thread_isr(int irq, void *data)
+{
+ struct tegra_devfreq *tegra = data;
+ bool handled = false;
+ unsigned int i;
+ u32 val;
+
+ mutex_lock(&tegra->devfreq->lock);
+
+ val = actmon_readl(tegra, ACTMON_GLB_STATUS);
+ for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
+ if (val & tegra->devices[i].config->irq_mask) {
+ actmon_isr_device(tegra, tegra->devices + i);
+ handled = true;
+ }
+ }
+
+ if (handled)
+ update_devfreq(tegra->devfreq);
+
+ mutex_unlock(&tegra->devfreq->lock);
+
+ return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int tegra_actmon_rate_notify_cb(struct notifier_block *nb,
+ unsigned long action, void *ptr)
+{
+ struct clk_notifier_data *data = ptr;
+ struct tegra_devfreq *tegra;
+ struct tegra_devfreq_device *dev;
+ unsigned int i;
+
+ if (action != POST_RATE_CHANGE)
+ return NOTIFY_OK;
+
+ tegra = container_of(nb, struct tegra_devfreq, rate_change_nb);
+
+ tegra->cur_freq = data->new_rate / KHZ;
+
+ for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
+ dev = &tegra->devices[i];
+
+ tegra_devfreq_update_wmark(tegra, dev);
+ }
+
+ actmon_write_barrier(tegra);
+
+ return NOTIFY_OK;
+}
+
+static void tegra_actmon_configure_device(struct tegra_devfreq *tegra,
+ struct tegra_devfreq_device *dev)
+{
+ u32 val = 0;
+
+ dev->target_freq = tegra->cur_freq;
+
+ dev->avg_count = tegra->cur_freq * ACTMON_SAMPLING_PERIOD;
+ device_writel(dev, dev->avg_count, ACTMON_DEV_INIT_AVG);
+
+ tegra_devfreq_update_avg_wmark(tegra, dev);
+ tegra_devfreq_update_wmark(tegra, dev);
+
+ device_writel(dev, ACTMON_COUNT_WEIGHT, ACTMON_DEV_COUNT_WEIGHT);
+ device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
+
+ val |= ACTMON_DEV_CTRL_ENB_PERIODIC;
+ val |= (ACTMON_AVERAGE_WINDOW_LOG2 - 1)
+ << ACTMON_DEV_CTRL_K_VAL_SHIFT;
+ val |= (ACTMON_BELOW_WMARK_WINDOW - 1)
+ << ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_NUM_SHIFT;
+ val |= (ACTMON_ABOVE_WMARK_WINDOW - 1)
+ << ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_NUM_SHIFT;
+ val |= ACTMON_DEV_CTRL_AVG_ABOVE_WMARK_EN;
+ val |= ACTMON_DEV_CTRL_AVG_BELOW_WMARK_EN;
+ val |= ACTMON_DEV_CTRL_CONSECUTIVE_BELOW_WMARK_EN;
+ val |= ACTMON_DEV_CTRL_CONSECUTIVE_ABOVE_WMARK_EN;
+ val |= ACTMON_DEV_CTRL_ENB;
+
+ device_writel(dev, val, ACTMON_DEV_CTRL);
+}
+
+static void tegra_actmon_start(struct tegra_devfreq *tegra)
+{
+ unsigned int i;
+
+ disable_irq(tegra->irq);
+
+ actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
+ ACTMON_GLB_PERIOD_CTRL);
+
+ for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
+ tegra_actmon_configure_device(tegra, &tegra->devices[i]);
+
+ actmon_write_barrier(tegra);
+
+ enable_irq(tegra->irq);
+}
+
+static void tegra_actmon_stop(struct tegra_devfreq *tegra)
+{
+ unsigned int i;
+
+ disable_irq(tegra->irq);
+
+ for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
+ device_writel(&tegra->devices[i], 0x00000000, ACTMON_DEV_CTRL);
+ device_writel(&tegra->devices[i], ACTMON_INTR_STATUS_CLEAR,
+ ACTMON_DEV_INTR_STATUS);
+ }
+
+ actmon_write_barrier(tegra);
+
+ enable_irq(tegra->irq);
+}
+
+static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
+ u32 flags)
+{
+ struct tegra_devfreq *tegra = dev_get_drvdata(dev);
+ struct devfreq *devfreq = tegra->devfreq;
+ struct dev_pm_opp *opp;
+ unsigned long rate;
+ int err;
+
+ opp = devfreq_recommended_opp(dev, freq, flags);
+ if (IS_ERR(opp)) {
+ dev_err(dev, "Failed to find opp for %lu Hz\n", *freq);
+ return PTR_ERR(opp);
+ }
+ rate = dev_pm_opp_get_freq(opp);
+ dev_pm_opp_put(opp);
+
+ err = clk_set_min_rate(tegra->emc_clock, rate);
+ if (err)
+ return err;
+
+ err = clk_set_rate(tegra->emc_clock, 0);
+ if (err)
+ goto restore_min_rate;
+
+ return 0;
+
+restore_min_rate:
+ clk_set_min_rate(tegra->emc_clock, devfreq->previous_freq);
+
+ return err;
+}
+
+static int tegra_devfreq_get_dev_status(struct device *dev,
+ struct devfreq_dev_status *stat)
+{
+ struct tegra_devfreq *tegra = dev_get_drvdata(dev);
+ struct tegra_devfreq_device *actmon_dev;
+ unsigned long cur_freq;
+
+ cur_freq = READ_ONCE(tegra->cur_freq);
+
+ /* To be used by the tegra governor */
+ stat->private_data = tegra;
+
+ /* The below are to be used by the other governors */
+ stat->current_frequency = cur_freq * KHZ;
+
+ actmon_dev = &tegra->devices[MCALL];
+
+ /* Number of cycles spent on memory access */
+ stat->busy_time = device_readl(actmon_dev, ACTMON_DEV_AVG_COUNT);
+
+ /* The bus can be considered to be saturated way before 100% */
+ stat->busy_time *= 100 / BUS_SATURATION_RATIO;
+
+ /* Number of cycles in a sampling period */
+ stat->total_time = ACTMON_SAMPLING_PERIOD * cur_freq;
+
+ stat->busy_time = min(stat->busy_time, stat->total_time);
+
+ return 0;
+}
+
+static struct devfreq_dev_profile tegra_devfreq_profile = {
+ .polling_ms = 0,
+ .target = tegra_devfreq_target,
+ .get_dev_status = tegra_devfreq_get_dev_status,
+};
+
+static int tegra_governor_get_target(struct devfreq *devfreq,
+ unsigned long *freq)
+{
+ struct devfreq_dev_status *stat;
+ struct tegra_devfreq *tegra;
+ struct tegra_devfreq_device *dev;
+ unsigned long target_freq = 0;
+ unsigned int i;
+ int err;
+
+ err = devfreq_update_stats(devfreq);
+ if (err)
+ return err;
+
+ stat = &devfreq->last_status;
+
+ tegra = stat->private_data;
+
+ for (i = 0; i < ARRAY_SIZE(tegra->devices); i++) {
+ dev = &tegra->devices[i];
+
+ actmon_update_target(tegra, dev);
+
+ target_freq = max(target_freq, dev->target_freq);
+ }
+
+ *freq = target_freq * KHZ;
+
+ return 0;
+}
+
+static int tegra_governor_event_handler(struct devfreq *devfreq,
+ unsigned int event, void *data)
+{
+ struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
+
+ switch (event) {
+ case DEVFREQ_GOV_START:
+ devfreq_monitor_start(devfreq);
+ tegra_actmon_start(tegra);
+ break;
+
+ case DEVFREQ_GOV_STOP:
+ tegra_actmon_stop(tegra);
+ devfreq_monitor_stop(devfreq);
+ break;
+
+ case DEVFREQ_GOV_SUSPEND:
+ tegra_actmon_stop(tegra);
+ devfreq_monitor_suspend(devfreq);
+ break;
+
+ case DEVFREQ_GOV_RESUME:
+ devfreq_monitor_resume(devfreq);
+ tegra_actmon_start(tegra);
+ break;
+ }
+
+ return 0;
+}
+
+static struct devfreq_governor tegra_devfreq_governor = {
+ .name = "tegra_actmon",
+ .get_target_freq = tegra_governor_get_target,
+ .event_handler = tegra_governor_event_handler,
+ .immutable = true,
+};
+
+static int tegra_devfreq_probe(struct platform_device *pdev)
+{
+ struct tegra_devfreq *tegra;
+ struct tegra_devfreq_device *dev;
+ unsigned int i;
+ unsigned long rate;
+ int err;
+
+ tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
+ if (!tegra)
+ return -ENOMEM;
+
+ tegra->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(tegra->regs))
+ return PTR_ERR(tegra->regs);
+
+ tegra->reset = devm_reset_control_get(&pdev->dev, "actmon");
+ if (IS_ERR(tegra->reset)) {
+ dev_err(&pdev->dev, "Failed to get reset\n");
+ return PTR_ERR(tegra->reset);
+ }
+
+ tegra->clock = devm_clk_get(&pdev->dev, "actmon");
+ if (IS_ERR(tegra->clock)) {
+ dev_err(&pdev->dev, "Failed to get actmon clock\n");
+ return PTR_ERR(tegra->clock);
+ }
+
+ tegra->emc_clock = devm_clk_get(&pdev->dev, "emc");
+ if (IS_ERR(tegra->emc_clock)) {
+ dev_err(&pdev->dev, "Failed to get emc clock\n");
+ return PTR_ERR(tegra->emc_clock);
+ }
+
+ tegra->irq = platform_get_irq(pdev, 0);
+ if (tegra->irq < 0) {
+ err = tegra->irq;
+ dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err);
+ return err;
+ }
+
+ reset_control_assert(tegra->reset);
+
+ err = clk_prepare_enable(tegra->clock);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Failed to prepare and enable ACTMON clock\n");
+ return err;
+ }
+
+ reset_control_deassert(tegra->reset);
+
+ tegra->max_freq = clk_round_rate(tegra->emc_clock, ULONG_MAX) / KHZ;
+ tegra->cur_freq = clk_get_rate(tegra->emc_clock) / KHZ;
+
+ for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) {
+ dev = tegra->devices + i;
+ dev->config = actmon_device_configs + i;
+ dev->regs = tegra->regs + dev->config->offset;
+ }
+
+ for (rate = 0; rate <= tegra->max_freq * KHZ; rate++) {
+ rate = clk_round_rate(tegra->emc_clock, rate);
+
+ err = dev_pm_opp_add(&pdev->dev, rate, 0);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to add OPP: %d\n", err);
+ goto remove_opps;
+ }
+ }
+
+ platform_set_drvdata(pdev, tegra);
+
+ tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb;
+ err = clk_notifier_register(tegra->emc_clock, &tegra->rate_change_nb);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Failed to register rate change notifier\n");
+ goto remove_opps;
+ }
+
+ err = devfreq_add_governor(&tegra_devfreq_governor);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to add governor: %d\n", err);
+ goto unreg_notifier;
+ }
+
+ tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
+ tegra->devfreq = devfreq_add_device(&pdev->dev,
+ &tegra_devfreq_profile,
+ "tegra_actmon",
+ NULL);
+ if (IS_ERR(tegra->devfreq)) {
+ err = PTR_ERR(tegra->devfreq);
+ goto remove_governor;
+ }
+
+ err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
+ actmon_thread_isr, IRQF_ONESHOT,
+ "tegra-devfreq", tegra);
+ if (err) {
+ dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
+ goto remove_devfreq;
+ }
+
+ return 0;
+
+remove_devfreq:
+ devfreq_remove_device(tegra->devfreq);
+
+remove_governor:
+ devfreq_remove_governor(&tegra_devfreq_governor);
+
+unreg_notifier:
+ clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
+
+remove_opps:
+ dev_pm_opp_remove_all_dynamic(&pdev->dev);
+
+ reset_control_reset(tegra->reset);
+ clk_disable_unprepare(tegra->clock);
+
+ return err;
+}
+
+static int tegra_devfreq_remove(struct platform_device *pdev)
+{
+ struct tegra_devfreq *tegra = platform_get_drvdata(pdev);
+
+ devfreq_remove_device(tegra->devfreq);
+ devfreq_remove_governor(&tegra_devfreq_governor);
+
+ clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
+ dev_pm_opp_remove_all_dynamic(&pdev->dev);
+
+ reset_control_reset(tegra->reset);
+ clk_disable_unprepare(tegra->clock);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_devfreq_of_match[] = {
+ { .compatible = "nvidia,tegra30-actmon" },
+ { .compatible = "nvidia,tegra124-actmon" },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, tegra_devfreq_of_match);
+
+static struct platform_driver tegra_devfreq_driver = {
+ .probe = tegra_devfreq_probe,
+ .remove = tegra_devfreq_remove,
+ .driver = {
+ .name = "tegra-devfreq",
+ .of_match_table = tegra_devfreq_of_match,
+ },
+};
+module_platform_driver(tegra_devfreq_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Tegra devfreq driver");
+MODULE_AUTHOR("Tomeu Vizoso <tomeu.vizoso@collabora.com>");
projects / linux.git / commitdiff