+++ /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