PM / devfreq: Add generic imx bus scaling driver
Add initial support for dynamic frequency switching on pieces of the imx interconnect fabric. All this driver does is set a clk rate based on an opp table, it does not map register areas. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Tested-by: Martin Kepplinger <martin.kepplinger@puri.sm> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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@ -91,6 +91,14 @@ config ARM_EXYNOS_BUS_DEVFREQ
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and adjusts the operating frequencies and voltages with OPP support.
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and adjusts the operating frequencies and voltages with OPP support.
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This does not yet operate with optimal voltages.
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This does not yet operate with optimal voltages.
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config ARM_IMX_BUS_DEVFREQ
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tristate "i.MX Generic Bus DEVFREQ Driver"
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depends on ARCH_MXC || COMPILE_TEST
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select DEVFREQ_GOV_USERSPACE
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help
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This adds the generic DEVFREQ driver for i.MX interconnects. It
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allows adjusting NIC/NOC frequency.
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config ARM_IMX8M_DDRC_DEVFREQ
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config ARM_IMX8M_DDRC_DEVFREQ
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tristate "i.MX8M DDRC DEVFREQ Driver"
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tristate "i.MX8M DDRC DEVFREQ Driver"
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depends on (ARCH_MXC && HAVE_ARM_SMCCC) || \
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depends on (ARCH_MXC && HAVE_ARM_SMCCC) || \
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@ -9,6 +9,7 @@ obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o
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# DEVFREQ Drivers
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# DEVFREQ Drivers
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obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o
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obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o
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obj-$(CONFIG_ARM_IMX_BUS_DEVFREQ) += imx-bus.o
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obj-$(CONFIG_ARM_IMX8M_DDRC_DEVFREQ) += imx8m-ddrc.o
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obj-$(CONFIG_ARM_IMX8M_DDRC_DEVFREQ) += imx8m-ddrc.o
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obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o
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obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o
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obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o
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obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o
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@ -0,0 +1,138 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 NXP
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*/
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#include <linux/clk.h>
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#include <linux/devfreq.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pm_opp.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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struct imx_bus {
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struct devfreq_dev_profile profile;
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struct devfreq *devfreq;
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struct clk *clk;
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};
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static int imx_bus_target(struct device *dev,
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unsigned long *freq, u32 flags)
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{
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struct dev_pm_opp *new_opp;
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int ret;
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new_opp = devfreq_recommended_opp(dev, freq, flags);
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if (IS_ERR(new_opp)) {
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ret = PTR_ERR(new_opp);
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dev_err(dev, "failed to get recommended opp: %d\n", ret);
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return ret;
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}
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dev_pm_opp_put(new_opp);
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return dev_pm_opp_set_rate(dev, *freq);
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}
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static int imx_bus_get_cur_freq(struct device *dev, unsigned long *freq)
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{
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struct imx_bus *priv = dev_get_drvdata(dev);
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*freq = clk_get_rate(priv->clk);
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return 0;
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}
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static int imx_bus_get_dev_status(struct device *dev,
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struct devfreq_dev_status *stat)
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{
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struct imx_bus *priv = dev_get_drvdata(dev);
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stat->busy_time = 0;
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stat->total_time = 0;
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stat->current_frequency = clk_get_rate(priv->clk);
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return 0;
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}
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static void imx_bus_exit(struct device *dev)
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{
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dev_pm_opp_of_remove_table(dev);
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}
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static int imx_bus_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct imx_bus *priv;
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const char *gov = DEVFREQ_GOV_USERSPACE;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/*
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* Fetch the clock to adjust but don't explicitly enable.
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*
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* For imx bus clock clk_set_rate is safe no matter if the clock is on
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* or off and some peripheral side-buses might be off unless enabled by
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* drivers for devices on those specific buses.
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*
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* Rate adjustment on a disabled bus clock just takes effect later.
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*/
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priv->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(priv->clk)) {
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ret = PTR_ERR(priv->clk);
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dev_err(dev, "failed to fetch clk: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, priv);
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ret = dev_pm_opp_of_add_table(dev);
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if (ret < 0) {
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dev_err(dev, "failed to get OPP table\n");
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return ret;
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}
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priv->profile.polling_ms = 1000;
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priv->profile.target = imx_bus_target;
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priv->profile.get_dev_status = imx_bus_get_dev_status;
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priv->profile.exit = imx_bus_exit;
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priv->profile.get_cur_freq = imx_bus_get_cur_freq;
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priv->profile.initial_freq = clk_get_rate(priv->clk);
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priv->devfreq = devm_devfreq_add_device(dev, &priv->profile,
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gov, NULL);
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if (IS_ERR(priv->devfreq)) {
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ret = PTR_ERR(priv->devfreq);
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dev_err(dev, "failed to add devfreq device: %d\n", ret);
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goto err;
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}
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return 0;
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err:
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dev_pm_opp_of_remove_table(dev);
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return ret;
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}
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static const struct of_device_id imx_bus_of_match[] = {
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{ .compatible = "fsl,imx8m-noc", },
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{ .compatible = "fsl,imx8m-nic", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, imx_bus_of_match);
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static struct platform_driver imx_bus_platdrv = {
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.probe = imx_bus_probe,
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.driver = {
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.name = "imx-bus-devfreq",
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.of_match_table = of_match_ptr(imx_bus_of_match),
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},
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};
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module_platform_driver(imx_bus_platdrv);
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MODULE_DESCRIPTION("Generic i.MX bus frequency scaling driver");
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MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
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MODULE_LICENSE("GPL v2");
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