--- /dev/null
+From 13f075999935bb696dbab63243923179f06fa05e Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Thu, 16 Jun 2022 19:56:08 +0200
+Subject: [PATCH 3/4] devfreq: add ipq806x fabric scaling driver
+
+Add ipq806x fabric scaling driver using the devfreq passive governor.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ drivers/devfreq/Kconfig | 11 ++
+ drivers/devfreq/Makefile | 1 +
+ drivers/devfreq/ipq806x-fab-devfreq.c | 155 ++++++++++++++++++++++++++
+ 3 files changed, 167 insertions(+)
+ create mode 100644 drivers/devfreq/ipq806x-fab-devfreq.c
+
+--- a/drivers/devfreq/Kconfig
++++ b/drivers/devfreq/Kconfig
+@@ -162,6 +162,17 @@ config ARM_KRAIT_CACHE_DEVFREQ
+ based on the max frequency across all core and the range set in the device
+ dts. If provided this scale also the regulator attached to the l2 cache.
+
++config ARM_IPQ806X_FAB_DEVFREQ
++ tristate "Scaling support for ipq806x Soc Fabric"
++ depends on ARCH_QCOM || COMPILE_TEST
++ select DEVFREQ_GOV_PASSIVE
++ help
++ This adds the DEVFREQ driver for the ipq806x Soc Fabric.
++
++ The driver register with the cpufreq notifier and find the right frequency
++ based on the max frequency across all core and the range set in the device
++ dts.
++
+ source "drivers/devfreq/event/Kconfig"
+
+ endif # PM_DEVFREQ
+--- a/drivers/devfreq/Makefile
++++ b/drivers/devfreq/Makefile
+@@ -16,6 +16,7 @@ obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) +=
+ obj-$(CONFIG_ARM_SUN8I_A33_MBUS_DEVFREQ) += sun8i-a33-mbus.o
+ obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o
+ obj-$(CONFIG_ARM_KRAIT_CACHE_DEVFREQ) += krait-cache-devfreq.o
++obj-$(CONFIG_ARM_IPQ806X_FAB_DEVFREQ) += ipq806x-fab-devfreq.o
+
+ # DEVFREQ Event Drivers
+ obj-$(CONFIG_PM_DEVFREQ_EVENT) += event/
+--- /dev/null
++++ b/drivers/devfreq/ipq806x-fab-devfreq.c
+@@ -0,0 +1,155 @@
++// SPDX-License-Identifier: GPL-2.0
++
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/cpufreq.h>
++#include <linux/devfreq.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/clk.h>
++#include <linux/slab.h>
++#include <linux/pm_opp.h>
++
++#include "governor.h"
++
++struct ipq806x_fab_data {
++ struct clk *fab_clk;
++ struct clk *ddr_clk;
++};
++
++static int ipq806x_fab_get_cur_freq(struct device *dev, unsigned long *freq)
++{
++ struct ipq806x_fab_data *data = dev_get_drvdata(dev);
++
++ *freq = clk_get_rate(data->fab_clk);
++
++ return 0;
++};
++
++static int ipq806x_fab_target(struct device *dev, unsigned long *freq,
++ u32 flags)
++{
++ struct ipq806x_fab_data *data = dev_get_drvdata(dev);
++ struct dev_pm_opp *opp;
++ int ret;
++
++ opp = dev_pm_opp_find_freq_ceil(dev, freq);
++ if (unlikely(IS_ERR(opp)))
++ return PTR_ERR(opp);
++
++ dev_pm_opp_put(opp);
++
++ ret = clk_set_rate(data->fab_clk, *freq);
++ if (ret)
++ return ret;
++
++ return clk_set_rate(data->ddr_clk, *freq);
++};
++
++static int ipq806x_fab_get_dev_status(struct device *dev,
++ struct devfreq_dev_status *stat)
++{
++ struct ipq806x_fab_data *data = dev_get_drvdata(dev);
++
++ stat->busy_time = 0;
++ stat->total_time = 0;
++ stat->current_frequency = clk_get_rate(data->fab_clk);
++
++ return 0;
++};
++
++static struct devfreq_dev_profile ipq806x_fab_devfreq_profile = {
++ .target = ipq806x_fab_target,
++ .get_dev_status = ipq806x_fab_get_dev_status,
++ .get_cur_freq = ipq806x_fab_get_cur_freq
++};
++
++static struct devfreq_passive_data devfreq_gov_data = {
++ .parent_type = CPUFREQ_PARENT_DEV,
++};
++
++static int ipq806x_fab_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct ipq806x_fab_data *data;
++ struct devfreq *devfreq;
++ struct clk *clk;
++ int ret;
++
++ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
++ if (!data)
++ return -ENOMEM;
++
++ clk = devm_clk_get(dev, "apps-fab-clk");
++ if (IS_ERR(clk)) {
++ dev_err_probe(dev, PTR_ERR(clk), "failed to get apps fab clk\n");
++ return PTR_ERR(clk);
++ }
++
++ clk_prepare_enable(clk);
++ data->fab_clk = clk;
++
++ clk = devm_clk_get(dev, "ddr-fab-clk");
++ if (IS_ERR(clk)) {
++ dev_err_probe(dev, PTR_ERR(clk), "failed to get ddr fab clk\n");
++ goto err_ddr;
++ }
++
++ clk_prepare_enable(clk);
++ data->ddr_clk = clk;
++
++ ret = dev_pm_opp_of_add_table(dev);
++ if (ret) {
++ dev_err(dev, "failed to parse fab freq thresholds\n");
++ return ret;
++ }
++
++ dev_set_drvdata(dev, data);
++
++ devfreq = devm_devfreq_add_device(&pdev->dev, &ipq806x_fab_devfreq_profile,
++ DEVFREQ_GOV_PASSIVE, &devfreq_gov_data);
++ if (IS_ERR(devfreq))
++ dev_pm_opp_remove_table(dev);
++
++ return PTR_ERR_OR_ZERO(devfreq);
++
++err_ddr:
++ clk_unprepare(data->fab_clk);
++ clk_put(data->fab_clk);
++ return PTR_ERR(clk);
++};
++
++static int ipq806x_fab_remove(struct platform_device *pdev)
++{
++ struct ipq806x_fab_data *data = dev_get_drvdata(&pdev->dev);
++
++ clk_unprepare(data->fab_clk);
++ clk_put(data->fab_clk);
++
++ clk_unprepare(data->ddr_clk);
++ clk_put(data->ddr_clk);
++
++ dev_pm_opp_remove_table(&pdev->dev);
++
++ return 0;
++};
++
++static const struct of_device_id ipq806x_fab_match_table[] = {
++ { .compatible = "qcom,fab-scaling" },
++ {}
++};
++
++static struct platform_driver ipq806x_fab_driver = {
++ .probe = ipq806x_fab_probe,
++ .remove = ipq806x_fab_remove,
++ .driver = {
++ .name = "ipq806x-fab-scaling",
++ .of_match_table = ipq806x_fab_match_table,
++ },
++};
++module_platform_driver(ipq806x_fab_driver);
++
++MODULE_DESCRIPTION("ipq806x Fab Scaling driver");
++MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
++MODULE_LICENSE("GPL v2");
projects / openwrt / openwrt.git / blobdiff