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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
@@ -143,6 +143,17 @@ 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
@@ -14,6 +14,7 @@ obj-$(CONFIG_ARM_IMX8M_DDRC_DEVFREQ) +=
obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.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");
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