Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Generic Exynos Bus frequency driver with DEVFREQ Framework
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2016 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author : Chanwoo Choi <cw00.choi@samsung.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * This driver support Exynos Bus frequency feature by using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/devfreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/devfreq-event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/pm_opp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define DEFAULT_SATURATION_RATIO	40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) struct exynos_bus {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct devfreq *devfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct devfreq_event_dev **edev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	unsigned int edev_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	unsigned long curr_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct opp_table *opp_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	unsigned int ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * Control the devfreq-event device to get the current state of bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define exynos_bus_ops_edev(ops)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static int exynos_bus_##ops(struct exynos_bus *bus)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int i, ret;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	for (i = 0; i < bus->edev_count; i++) {			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		if (!bus->edev[i])				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			continue;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		ret = devfreq_event_##ops(bus->edev[i]);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		if (ret < 0)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			return ret;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return 0;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) exynos_bus_ops_edev(enable_edev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) exynos_bus_ops_edev(disable_edev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) exynos_bus_ops_edev(set_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static int exynos_bus_get_event(struct exynos_bus *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 				struct devfreq_event_data *edata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct devfreq_event_data event_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	unsigned long load_count = 0, total_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	for (i = 0; i < bus->edev_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (!bus->edev[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		ret = devfreq_event_get_event(bus->edev[i], &event_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		if (i == 0 || event_data.load_count > load_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			load_count = event_data.load_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			total_count = event_data.total_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	edata->load_count = load_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	edata->total_count = total_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * devfreq function for both simple-ondemand and passive governor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct dev_pm_opp *new_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	/* Get correct frequency for bus. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	new_opp = devfreq_recommended_opp(dev, freq, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (IS_ERR(new_opp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		dev_err(dev, "failed to get recommended opp instance\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return PTR_ERR(new_opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	dev_pm_opp_put(new_opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	/* Change voltage and frequency according to new OPP level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	mutex_lock(&bus->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	ret = dev_pm_opp_set_rate(dev, *freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		bus->curr_freq = *freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	mutex_unlock(&bus->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int exynos_bus_get_dev_status(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				     struct devfreq_dev_status *stat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct devfreq_event_data edata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	stat->current_frequency = bus->curr_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	ret = exynos_bus_get_event(bus, &edata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		dev_err(dev, "failed to get event from devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		stat->total_time = stat->busy_time = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	stat->busy_time = (edata.load_count * 100) / bus->ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	stat->total_time = edata.total_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	dev_dbg(dev, "Usage of devfreq-event : %lu/%lu\n", stat->busy_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 							stat->total_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	ret = exynos_bus_set_event(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		dev_err(dev, "failed to set event to devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static void exynos_bus_exit(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	ret = exynos_bus_disable_edev(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		dev_warn(dev, "failed to disable the devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	clk_disable_unprepare(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (bus->opp_table) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		dev_pm_opp_put_regulators(bus->opp_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		bus->opp_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static void exynos_bus_passive_exit(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	clk_disable_unprepare(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int exynos_bus_parent_parse_of(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 					struct exynos_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct device *dev = bus->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct opp_table *opp_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	const char *vdd = "vdd";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int i, ret, count, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	opp_table = dev_pm_opp_set_regulators(dev, &vdd, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (IS_ERR(opp_table)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		ret = PTR_ERR(opp_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		dev_err(dev, "failed to set regulators %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	bus->opp_table = opp_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	 * Get the devfreq-event devices to get the current utilization of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	 * buses. This raw data will be used in devfreq ondemand governor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	count = devfreq_event_get_edev_count(dev, "devfreq-events");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (count < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		dev_err(dev, "failed to get the count of devfreq-event dev\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto err_regulator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	bus->edev_count = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	size = sizeof(*bus->edev) * count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (!bus->edev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		goto err_regulator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		bus->edev[i] = devfreq_event_get_edev_by_phandle(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 							"devfreq-events", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		if (IS_ERR(bus->edev[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			ret = -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			goto err_regulator;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 * Optionally, Get the saturation ratio according to Exynos SoC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 * When measuring the utilization of each AXI bus with devfreq-event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 * devices, the measured real cycle might be much lower than the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 * total cycle of bus during sampling rate. In result, the devfreq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 * simple-ondemand governor might not decide to change the current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * frequency due to too utilization (= real cycle/total cycle).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 * So, this property is used to adjust the utilization when calculating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * the busy_time in exynos_bus_get_dev_status().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		bus->ratio = DEFAULT_SATURATION_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) err_regulator:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	dev_pm_opp_put_regulators(bus->opp_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	bus->opp_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int exynos_bus_parse_of(struct device_node *np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			      struct exynos_bus *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct device *dev = bus->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct dev_pm_opp *opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	unsigned long rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/* Get the clock to provide each bus with source clock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	bus->clk = devm_clk_get(dev, "bus");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (IS_ERR(bus->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		dev_err(dev, "failed to get bus clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return PTR_ERR(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	ret = clk_prepare_enable(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		dev_err(dev, "failed to get enable clock\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/* Get the freq and voltage from OPP table to scale the bus freq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	ret = dev_pm_opp_of_add_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		dev_err(dev, "failed to get OPP table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		goto err_clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	rate = clk_get_rate(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	opp = devfreq_recommended_opp(dev, &rate, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (IS_ERR(opp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		dev_err(dev, "failed to find dev_pm_opp\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		ret = PTR_ERR(opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		goto err_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	bus->curr_freq = dev_pm_opp_get_freq(opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	dev_pm_opp_put(opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) err_opp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) err_clk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	clk_disable_unprepare(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int exynos_bus_profile_init(struct exynos_bus *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 				   struct devfreq_dev_profile *profile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	struct device *dev = bus->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	struct devfreq_simple_ondemand_data *ondemand_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	/* Initialize the struct profile and governor data for parent device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	profile->polling_ms = 50;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	profile->target = exynos_bus_target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	profile->get_dev_status = exynos_bus_get_dev_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	profile->exit = exynos_bus_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (!ondemand_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	ondemand_data->upthreshold = 40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	ondemand_data->downdifferential = 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	/* Add devfreq device to monitor and handle the exynos bus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	bus->devfreq = devm_devfreq_add_device(dev, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 						DEVFREQ_GOV_SIMPLE_ONDEMAND,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 						ondemand_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (IS_ERR(bus->devfreq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		dev_err(dev, "failed to add devfreq device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		return PTR_ERR(bus->devfreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	/* Register opp_notifier to catch the change of OPP  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		dev_err(dev, "failed to register opp notifier\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	 * Enable devfreq-event to get raw data which is used to determine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	 * current bus load.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	ret = exynos_bus_enable_edev(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		dev_err(dev, "failed to enable devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	ret = exynos_bus_set_event(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		dev_err(dev, "failed to set event to devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		goto err_edev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) err_edev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (exynos_bus_disable_edev(bus))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		dev_warn(dev, "failed to disable the devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 					   struct devfreq_dev_profile *profile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	struct device *dev = bus->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	struct devfreq_passive_data *passive_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	struct devfreq *parent_devfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	/* Initialize the struct profile and governor data for passive device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	profile->target = exynos_bus_target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	profile->exit = exynos_bus_passive_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	/* Get the instance of parent devfreq device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, "devfreq", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	if (IS_ERR(parent_devfreq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	if (!passive_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	passive_data->parent = parent_devfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	/* Add devfreq device for exynos bus with passive governor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 						passive_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	if (IS_ERR(bus->devfreq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		dev_err(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 			"failed to add devfreq dev with passive governor\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		return PTR_ERR(bus->devfreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static int exynos_bus_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	struct device_node *np = dev->of_node, *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	struct devfreq_dev_profile *profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	struct exynos_bus *bus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	int ret, max_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	unsigned long min_freq, max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	bool passive = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	if (!np) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		dev_err(dev, "failed to find devicetree node\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (!bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	mutex_init(&bus->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	bus->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	platform_set_drvdata(pdev, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	if (!profile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	node = of_parse_phandle(dev->of_node, "devfreq", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	if (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		of_node_put(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		passive = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		ret = exynos_bus_parent_parse_of(np, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	/* Parse the device-tree to get the resource information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	ret = exynos_bus_parse_of(np, bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		goto err_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	if (passive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		ret = exynos_bus_profile_init_passive(bus, profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		ret = exynos_bus_profile_init(bus, profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	max_state = bus->devfreq->profile->max_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 			dev_name(dev), min_freq, max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	clk_disable_unprepare(bus->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) err_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	if (!passive) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		dev_pm_opp_put_regulators(bus->opp_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		bus->opp_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static void exynos_bus_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	struct exynos_bus *bus = dev_get_drvdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	devfreq_suspend_device(bus->devfreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int exynos_bus_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	ret = exynos_bus_enable_edev(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 		dev_err(dev, "failed to enable the devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static int exynos_bus_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	struct exynos_bus *bus = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	ret = exynos_bus_disable_edev(bus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 		dev_err(dev, "failed to disable the devfreq-event devices\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static const struct dev_pm_ops exynos_bus_pm = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 	SET_SYSTEM_SLEEP_PM_OPS(exynos_bus_suspend, exynos_bus_resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) static const struct of_device_id exynos_bus_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 	{ .compatible = "samsung,exynos-bus", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	{ /* sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) MODULE_DEVICE_TABLE(of, exynos_bus_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) static struct platform_driver exynos_bus_platdrv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 	.probe		= exynos_bus_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 	.shutdown	= exynos_bus_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 		.name	= "exynos-bus",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 		.pm	= &exynos_bus_pm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 		.of_match_table = of_match_ptr(exynos_bus_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) module_platform_driver(exynos_bus_platdrv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) MODULE_LICENSE("GPL v2");