1 files changed, 148 insertions, 208 deletions

diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 49f68929e024..b9ea7ad2e51b 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Generic Exynos Bus frequency driver with DEVFREQ Framework
  *
@@ -6,10 +7,6 @@
  *
  * This driver support Exynos Bus frequency feature by using
  * DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/clk.h>
@@ -18,17 +15,16 @@
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
+#include <linux/of.h>
 #include <linux/pm_opp.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
-#include <linux/slab.h>
 
 #define DEFAULT_SATURATION_RATIO	40
-#define DEFAULT_VOLTAGE_TOLERANCE	2
 
 struct exynos_bus {
 	struct device *dev;
+	struct platform_device *icc_pdev;
 
 	struct devfreq *devfreq;
 	struct devfreq_event_dev **edev;
@@ -37,9 +33,8 @@ struct exynos_bus {
 
 	unsigned long curr_freq;
 
-	struct regulator *regulator;
+	int opp_token;
 	struct clk *clk;
-	unsigned int voltage_tolerance;
 	unsigned int ratio;
 };
 
@@ -93,62 +88,29 @@ static int exynos_bus_get_event(struct exynos_bus *bus,
 }
 
 /*
- * Must necessary function for devfreq simple-ondemand governor
+ * devfreq function for both simple-ondemand and passive governor
  */
 static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
 {
 	struct exynos_bus *bus = dev_get_drvdata(dev);
 	struct dev_pm_opp *new_opp;
-	unsigned long old_freq, new_freq, new_volt, tol;
 	int ret = 0;
 
-	/* Get new opp-bus instance according to new bus clock */
+	/* Get correct frequency for bus. */
 	new_opp = devfreq_recommended_opp(dev, freq, flags);
 	if (IS_ERR(new_opp)) {
 		dev_err(dev, "failed to get recommended opp instance\n");
 		return PTR_ERR(new_opp);
 	}
 
-	new_freq = dev_pm_opp_get_freq(new_opp);
-	new_volt = dev_pm_opp_get_voltage(new_opp);
 	dev_pm_opp_put(new_opp);
 
-	old_freq = bus->curr_freq;
-
-	if (old_freq == new_freq)
-		return 0;
-	tol = new_volt * bus->voltage_tolerance / 100;
-
 	/* Change voltage and frequency according to new OPP level */
 	mutex_lock(&bus->lock);
+	ret = dev_pm_opp_set_rate(dev, *freq);
+	if (!ret)
+		bus->curr_freq = *freq;
 
-	if (old_freq < new_freq) {
-		ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
-		if (ret < 0) {
-			dev_err(bus->dev, "failed to set voltage\n");
-			goto out;
-		}
-	}
-
-	ret = clk_set_rate(bus->clk, new_freq);
-	if (ret < 0) {
-		dev_err(dev, "failed to change clock of bus\n");
-		clk_set_rate(bus->clk, old_freq);
-		goto out;
-	}
-
-	if (old_freq > new_freq) {
-		ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
-		if (ret < 0) {
-			dev_err(bus->dev, "failed to set voltage\n");
-			goto out;
-		}
-	}
-	bus->curr_freq = new_freq;
-
-	dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
-			old_freq, new_freq, clk_get_rate(bus->clk));
-out:
 	mutex_unlock(&bus->lock);
 
 	return ret;
@@ -165,6 +127,7 @@ static int exynos_bus_get_dev_status(struct device *dev,
 
 	ret = exynos_bus_get_event(bus, &edata);
 	if (ret < 0) {
+		dev_err(dev, "failed to get event from devfreq-event devices\n");
 		stat->total_time = stat->busy_time = 0;
 		goto err;
 	}
@@ -194,91 +157,41 @@ static void exynos_bus_exit(struct device *dev)
 	if (ret < 0)
 		dev_warn(dev, "failed to disable the devfreq-event devices\n");
 
-	if (bus->regulator)
-		regulator_disable(bus->regulator);
+	platform_device_unregister(bus->icc_pdev);
 
 	dev_pm_opp_of_remove_table(dev);
-	clk_disable_unprepare(bus->clk);
-}
-
-/*
- * Must necessary function for devfreq passive governor
- */
-static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
-					u32 flags)
-{
-	struct exynos_bus *bus = dev_get_drvdata(dev);
-	struct dev_pm_opp *new_opp;
-	unsigned long old_freq, new_freq;
-	int ret = 0;
-
-	/* Get new opp-bus instance according to new bus clock */
-	new_opp = devfreq_recommended_opp(dev, freq, flags);
-	if (IS_ERR(new_opp)) {
-		dev_err(dev, "failed to get recommended opp instance\n");
-		return PTR_ERR(new_opp);
-	}
-
-	new_freq = dev_pm_opp_get_freq(new_opp);
-	dev_pm_opp_put(new_opp);
-
-	old_freq = bus->curr_freq;
-
-	if (old_freq == new_freq)
-		return 0;
-
-	/* Change the frequency according to new OPP level */
-	mutex_lock(&bus->lock);
-
-	ret = clk_set_rate(bus->clk, new_freq);
-	if (ret < 0) {
-		dev_err(dev, "failed to set the clock of bus\n");
-		goto out;
-	}
-
-	*freq = new_freq;
-	bus->curr_freq = new_freq;
-
-	dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
-			old_freq, new_freq, clk_get_rate(bus->clk));
-out:
-	mutex_unlock(&bus->lock);
-
-	return ret;
+	dev_pm_opp_put_regulators(bus->opp_token);
 }
 
 static void exynos_bus_passive_exit(struct device *dev)
 {
 	struct exynos_bus *bus = dev_get_drvdata(dev);
 
+	platform_device_unregister(bus->icc_pdev);
+
 	dev_pm_opp_of_remove_table(dev);
-	clk_disable_unprepare(bus->clk);
 }
 
 static int exynos_bus_parent_parse_of(struct device_node *np,
 					struct exynos_bus *bus)
 {
 	struct device *dev = bus->dev;
+	const char *supplies[] = { "vdd", NULL };
 	int i, ret, count, size;
 
-	/* Get the regulator to provide each bus with the power */
-	bus->regulator = devm_regulator_get(dev, "vdd");
-	if (IS_ERR(bus->regulator)) {
-		dev_err(dev, "failed to get VDD regulator\n");
-		return PTR_ERR(bus->regulator);
-	}
-
-	ret = regulator_enable(bus->regulator);
+	ret = dev_pm_opp_set_regulators(dev, supplies);
 	if (ret < 0) {
-		dev_err(dev, "failed to enable VDD regulator\n");
+		dev_err(dev, "failed to set regulators %d\n", ret);
 		return ret;
 	}
 
+	bus->opp_token = ret;
+
 	/*
 	 * Get the devfreq-event devices to get the current utilization of
 	 * buses. This raw data will be used in devfreq ondemand governor.
 	 */
-	count = devfreq_event_get_edev_count(dev);
+	count = devfreq_event_get_edev_count(dev, "devfreq-events");
 	if (count < 0) {
 		dev_err(dev, "failed to get the count of devfreq-event dev\n");
 		ret = count;
@@ -294,7 +207,8 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
 	}
 
 	for (i = 0; i < count; i++) {
-		bus->edev[i] = devfreq_event_get_edev_by_phandle(dev, i);
+		bus->edev[i] = devfreq_event_get_edev_by_phandle(dev,
+							"devfreq-events", i);
 		if (IS_ERR(bus->edev[i])) {
 			ret = -EPROBE_DEFER;
 			goto err_regulator;
@@ -314,20 +228,15 @@ static int exynos_bus_parent_parse_of(struct device_node *np,
 	if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
 		bus->ratio = DEFAULT_SATURATION_RATIO;
 
-	if (of_property_read_u32(np, "exynos,voltage-tolerance",
-					&bus->voltage_tolerance))
-		bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE;
-
 	return 0;
 
 err_regulator:
-	regulator_disable(bus->regulator);
+	dev_pm_opp_put_regulators(bus->opp_token);
 
 	return ret;
 }
 
-static int exynos_bus_parse_of(struct device_node *np,
-			      struct exynos_bus *bus)
+static int exynos_bus_parse_of(struct exynos_bus *bus)
 {
 	struct device *dev = bus->dev;
 	struct dev_pm_opp *opp;
@@ -335,23 +244,16 @@ static int exynos_bus_parse_of(struct device_node *np,
 	int ret;
 
 	/* Get the clock to provide each bus with source clock */
-	bus->clk = devm_clk_get(dev, "bus");
-	if (IS_ERR(bus->clk)) {
-		dev_err(dev, "failed to get bus clock\n");
-		return PTR_ERR(bus->clk);
-	}
-
-	ret = clk_prepare_enable(bus->clk);
-	if (ret < 0) {
-		dev_err(dev, "failed to get enable clock\n");
-		return ret;
-	}
+	bus->clk = devm_clk_get_enabled(dev, "bus");
+	if (IS_ERR(bus->clk))
+		return dev_err_probe(dev, PTR_ERR(bus->clk),
+				"failed to get bus clock\n");
 
 	/* Get the freq and voltage from OPP table to scale the bus freq */
 	ret = dev_pm_opp_of_add_table(dev);
 	if (ret < 0) {
 		dev_err(dev, "failed to get OPP table\n");
-		goto err_clk;
+		return ret;
 	}
 
 	rate = clk_get_rate(bus->clk);
@@ -369,57 +271,16 @@ static int exynos_bus_parse_of(struct device_node *np,
 
 err_opp:
 	dev_pm_opp_of_remove_table(dev);
-err_clk:
-	clk_disable_unprepare(bus->clk);
 
 	return ret;
 }
 
-static int exynos_bus_probe(struct platform_device *pdev)
+static int exynos_bus_profile_init(struct exynos_bus *bus,
+				   struct devfreq_dev_profile *profile)
 {
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node, *node;
-	struct devfreq_dev_profile *profile;
+	struct device *dev = bus->dev;
 	struct devfreq_simple_ondemand_data *ondemand_data;
-	struct devfreq_passive_data *passive_data;
-	struct devfreq *parent_devfreq;
-	struct exynos_bus *bus;
-	int ret, max_state;
-	unsigned long min_freq, max_freq;
-
-	if (!np) {
-		dev_err(dev, "failed to find devicetree node\n");
-		return -EINVAL;
-	}
-
-	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
-	if (!bus)
-		return -ENOMEM;
-	mutex_init(&bus->lock);
-	bus->dev = &pdev->dev;
-	platform_set_drvdata(pdev, bus);
-
-	/* Parse the device-tree to get the resource information */
-	ret = exynos_bus_parse_of(np, bus);
-	if (ret < 0)
-		return ret;
-
-	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
-	if (!profile) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	node = of_parse_phandle(dev->of_node, "devfreq", 0);
-	if (node) {
-		of_node_put(node);
-		goto passive;
-	} else {
-		ret = exynos_bus_parent_parse_of(np, bus);
-	}
-
-	if (ret < 0)
-		goto err;
+	int ret;
 
 	/* Initialize the struct profile and governor data for parent device */
 	profile->polling_ms = 50;
@@ -428,27 +289,26 @@ static int exynos_bus_probe(struct platform_device *pdev)
 	profile->exit = exynos_bus_exit;
 
 	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
-	if (!ondemand_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!ondemand_data)
+		return -ENOMEM;
+
 	ondemand_data->upthreshold = 40;
 	ondemand_data->downdifferential = 5;
 
 	/* Add devfreq device to monitor and handle the exynos bus */
-	bus->devfreq = devm_devfreq_add_device(dev, profile, "simple_ondemand",
+	bus->devfreq = devm_devfreq_add_device(dev, profile,
+						DEVFREQ_GOV_SIMPLE_ONDEMAND,
 						ondemand_data);
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev, "failed to add devfreq device\n");
-		ret = PTR_ERR(bus->devfreq);
-		goto err;
+		return PTR_ERR(bus->devfreq);
 	}
 
 	/* Register opp_notifier to catch the change of OPP  */
 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
 	if (ret < 0) {
 		dev_err(dev, "failed to register opp notifier\n");
-		goto err;
+		return ret;
 	}
 
 	/*
@@ -458,49 +318,122 @@ static int exynos_bus_probe(struct platform_device *pdev)
 	ret = exynos_bus_enable_edev(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable devfreq-event devices\n");
-		goto err;
+		return ret;
 	}
 
 	ret = exynos_bus_set_event(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to set event to devfreq-event devices\n");
-		goto err;
+		goto err_edev;
 	}
 
-	goto out;
-passive:
+	return 0;
+
+err_edev:
+	if (exynos_bus_disable_edev(bus))
+		dev_warn(dev, "failed to disable the devfreq-event devices\n");
+
+	return ret;
+}
+
+static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
+					   struct devfreq_dev_profile *profile)
+{
+	struct device *dev = bus->dev;
+	struct devfreq_passive_data *passive_data;
+	struct devfreq *parent_devfreq;
+
 	/* Initialize the struct profile and governor data for passive device */
-	profile->target = exynos_bus_passive_target;
+	profile->target = exynos_bus_target;
 	profile->exit = exynos_bus_passive_exit;
 
 	/* Get the instance of parent devfreq device */
-	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
-	if (IS_ERR(parent_devfreq)) {
-		ret = -EPROBE_DEFER;
-		goto err;
-	}
+	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, "devfreq", 0);
+	if (IS_ERR(parent_devfreq))
+		return -EPROBE_DEFER;
 
 	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
-	if (!passive_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!passive_data)
+		return -ENOMEM;
+
 	passive_data->parent = parent_devfreq;
 
 	/* Add devfreq device for exynos bus with passive governor */
-	bus->devfreq = devm_devfreq_add_device(dev, profile, "passive",
+	bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
 						passive_data);
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev,
 			"failed to add devfreq dev with passive governor\n");
-		ret = PTR_ERR(bus->devfreq);
+		return PTR_ERR(bus->devfreq);
+	}
+
+	return 0;
+}
+
+static int exynos_bus_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node, *node;
+	struct devfreq_dev_profile *profile;
+	struct exynos_bus *bus;
+	int ret, max_state;
+	unsigned long min_freq, max_freq;
+	bool passive = false;
+
+	if (!np) {
+		dev_err(dev, "failed to find devicetree node\n");
+		return -EINVAL;
+	}
+
+	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
+	if (!bus)
+		return -ENOMEM;
+	mutex_init(&bus->lock);
+	bus->dev = &pdev->dev;
+	platform_set_drvdata(pdev, bus);
+
+	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
+	if (!profile)
+		return -ENOMEM;
+
+	node = of_parse_phandle(dev->of_node, "devfreq", 0);
+	if (node) {
+		of_node_put(node);
+		passive = true;
+	} else {
+		ret = exynos_bus_parent_parse_of(np, bus);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Parse the device-tree to get the resource information */
+	ret = exynos_bus_parse_of(bus);
+	if (ret < 0)
+		goto err_reg;
+
+	if (passive)
+		ret = exynos_bus_profile_init_passive(bus, profile);
+	else
+		ret = exynos_bus_profile_init(bus, profile);
+
+	if (ret < 0)
 		goto err;
+
+	/* Create child platform device for the interconnect provider */
+	if (of_property_present(dev->of_node, "#interconnect-cells")) {
+		bus->icc_pdev = platform_device_register_data(
+						dev, "exynos-generic-icc",
+						PLATFORM_DEVID_AUTO, NULL, 0);
+
+		if (IS_ERR(bus->icc_pdev)) {
+			ret = PTR_ERR(bus->icc_pdev);
+			goto err;
+		}
 	}
 
-out:
-	max_state = bus->devfreq->profile->max_state;
-	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
-	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
+	max_state = bus->devfreq->max_state;
+	min_freq = (bus->devfreq->freq_table[0] / 1000);
+	max_freq = (bus->devfreq->freq_table[max_state - 1] / 1000);
 	pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n",
 			dev_name(dev), min_freq, max_freq);
 
@@ -508,12 +441,19 @@ out:
 
 err:
 	dev_pm_opp_of_remove_table(dev);
-	clk_disable_unprepare(bus->clk);
+err_reg:
+	dev_pm_opp_put_regulators(bus->opp_token);
 
 	return ret;
 }
 
-#ifdef CONFIG_PM_SLEEP
+static void exynos_bus_shutdown(struct platform_device *pdev)
+{
+	struct exynos_bus *bus = dev_get_drvdata(&pdev->dev);
+
+	devfreq_suspend_device(bus->devfreq);
+}
+
 static int exynos_bus_resume(struct device *dev)
 {
 	struct exynos_bus *bus = dev_get_drvdata(dev);
@@ -541,11 +481,9 @@ static int exynos_bus_suspend(struct device *dev)
 
 	return 0;
 }
-#endif
 
-static const struct dev_pm_ops exynos_bus_pm = {
-	SET_SYSTEM_SLEEP_PM_OPS(exynos_bus_suspend, exynos_bus_resume)
-};
+static DEFINE_SIMPLE_DEV_PM_OPS(exynos_bus_pm,
+				exynos_bus_suspend, exynos_bus_resume);
 
 static const struct of_device_id exynos_bus_of_match[] = {
 	{ .compatible = "samsung,exynos-bus", },
@@ -555,14 +493,16 @@ MODULE_DEVICE_TABLE(of, exynos_bus_of_match);
 
 static struct platform_driver exynos_bus_platdrv = {
 	.probe		= exynos_bus_probe,
+	.shutdown	= exynos_bus_shutdown,
 	.driver = {
 		.name	= "exynos-bus",
-		.pm	= &exynos_bus_pm,
-		.of_match_table = of_match_ptr(exynos_bus_of_match),
+		.pm	= pm_sleep_ptr(&exynos_bus_pm),
+		.of_match_table = exynos_bus_of_match,
 	},
 };
 module_platform_driver(exynos_bus_platdrv);
 
+MODULE_SOFTDEP("pre: exynos_ppmu");
 MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");
 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 MODULE_LICENSE("GPL v2");