3  * Generic Exynos Bus frequency driver with DEVFREQ Framework
8  * This driver support Exynos Bus frequency feature by using
42  * Control the devfreq-event device to get the current state of bus
45 static int exynos_bus_##ops(struct exynos_bus *bus)		\
49 	for (i = 0; i < bus->edev_count; i++) {			\
50 		if (!bus->edev[i])				\
52 		ret = devfreq_event_##ops(bus->edev[i]);	\
63 static int exynos_bus_get_event(struct exynos_bus *bus,  in exynos_bus_get_event()  argument
70 	for (i = 0; i < bus->edev_count; i++) {  in exynos_bus_get_event()
71 		if (!bus->edev[i])  in exynos_bus_get_event()
74 		ret = devfreq_event_get_event(bus->edev[i], &event_data);  in exynos_bus_get_event()
95 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_target()  local
99 	/* Get correct frequency for bus. */  in exynos_bus_target()
109 	mutex_lock(&bus->lock);  in exynos_bus_target()
112 		bus->curr_freq = *freq;  in exynos_bus_target()
114 	mutex_unlock(&bus->lock);  in exynos_bus_target()
122 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_get_dev_status()  local
126 	stat->current_frequency = bus->curr_freq;  in exynos_bus_get_dev_status()
128 	ret = exynos_bus_get_event(bus, &edata);  in exynos_bus_get_dev_status()
134 	stat->busy_time = (edata.load_count * 100) / bus->ratio;  in exynos_bus_get_dev_status()
141 	ret = exynos_bus_set_event(bus);  in exynos_bus_get_dev_status()
152 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_exit()  local
155 	ret = exynos_bus_disable_edev(bus);  in exynos_bus_exit()
160 	clk_disable_unprepare(bus->clk);  in exynos_bus_exit()
161 	if (bus->opp_table) {  in exynos_bus_exit()
162 		dev_pm_opp_put_regulators(bus->opp_table);  in exynos_bus_exit()
163 		bus->opp_table = NULL;  in exynos_bus_exit()
169 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_passive_exit()  local
172 	clk_disable_unprepare(bus->clk);  in exynos_bus_passive_exit()
176 					struct exynos_bus *bus)  in exynos_bus_parent_parse_of()  argument
178 	struct device *dev = bus->dev;  in exynos_bus_parent_parse_of()
190 	bus->opp_table = opp_table;  in exynos_bus_parent_parse_of()
202 	bus->edev_count = count;  in exynos_bus_parent_parse_of()
204 	size = sizeof(*bus->edev) * count;  in exynos_bus_parent_parse_of()
205 	bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);  in exynos_bus_parent_parse_of()
206 	if (!bus->edev) {  in exynos_bus_parent_parse_of()
212 		bus->edev[i] = devfreq_event_get_edev_by_phandle(dev, i);  in exynos_bus_parent_parse_of()
213 		if (IS_ERR(bus->edev[i])) {  in exynos_bus_parent_parse_of()
221 	 * When measuring the utilization of each AXI bus with devfreq-event  in exynos_bus_parent_parse_of()
223 	 * total cycle of bus during sampling rate. In result, the devfreq  in exynos_bus_parent_parse_of()
229 	if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))  in exynos_bus_parent_parse_of()
230 		bus->ratio = DEFAULT_SATURATION_RATIO;  in exynos_bus_parent_parse_of()
235 	dev_pm_opp_put_regulators(bus->opp_table);  in exynos_bus_parent_parse_of()
236 	bus->opp_table = NULL;  in exynos_bus_parent_parse_of()
242 			      struct exynos_bus *bus)  in exynos_bus_parse_of()  argument
244 	struct device *dev = bus->dev;  in exynos_bus_parse_of()
249 	/* Get the clock to provide each bus with source clock */  in exynos_bus_parse_of()
250 	bus->clk = devm_clk_get(dev, "bus");  in exynos_bus_parse_of()
251 	if (IS_ERR(bus->clk)) {  in exynos_bus_parse_of()
252 		dev_err(dev, "failed to get bus clock\n");  in exynos_bus_parse_of()
253 		return PTR_ERR(bus->clk);  in exynos_bus_parse_of()
256 	ret = clk_prepare_enable(bus->clk);  in exynos_bus_parse_of()
262 	/* Get the freq and voltage from OPP table to scale the bus freq */  in exynos_bus_parse_of()
269 	rate = clk_get_rate(bus->clk);  in exynos_bus_parse_of()
277 	bus->curr_freq = dev_pm_opp_get_freq(opp);  in exynos_bus_parse_of()
285 	clk_disable_unprepare(bus->clk);  in exynos_bus_parse_of()
298 	struct exynos_bus *bus;  in exynos_bus_probe()  local
308 	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);  in exynos_bus_probe()
309 	if (!bus)  in exynos_bus_probe()
311 	mutex_init(&bus->lock);  in exynos_bus_probe()
312 	bus->dev = &pdev->dev;  in exynos_bus_probe()
313 	platform_set_drvdata(pdev, bus);  in exynos_bus_probe()
324 		ret = exynos_bus_parent_parse_of(np, bus);  in exynos_bus_probe()
330 	ret = exynos_bus_parse_of(np, bus);  in exynos_bus_probe()
351 	/* Add devfreq device to monitor and handle the exynos bus */  in exynos_bus_probe()
352 	bus->devfreq = devm_devfreq_add_device(dev, profile,  in exynos_bus_probe()
355 	if (IS_ERR(bus->devfreq)) {  in exynos_bus_probe()
357 		ret = PTR_ERR(bus->devfreq);  in exynos_bus_probe()
362 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);  in exynos_bus_probe()
370 	 * current bus load.  in exynos_bus_probe()
372 	ret = exynos_bus_enable_edev(bus);  in exynos_bus_probe()
378 	ret = exynos_bus_set_event(bus);  in exynos_bus_probe()
404 	/* Add devfreq device for exynos bus with passive governor */  in exynos_bus_probe()
405 	bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,  in exynos_bus_probe()
407 	if (IS_ERR(bus->devfreq)) {  in exynos_bus_probe()
410 		ret = PTR_ERR(bus->devfreq);  in exynos_bus_probe()
415 	max_state = bus->devfreq->profile->max_state;  in exynos_bus_probe()
416 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);  in exynos_bus_probe()
417 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);  in exynos_bus_probe()
418 	pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n",  in exynos_bus_probe()
425 	clk_disable_unprepare(bus->clk);  in exynos_bus_probe()
428 		dev_pm_opp_put_regulators(bus->opp_table);  in exynos_bus_probe()
429 		bus->opp_table = NULL;  in exynos_bus_probe()
437 	struct exynos_bus *bus = dev_get_drvdata(&pdev->dev);  in exynos_bus_shutdown()  local
439 	devfreq_suspend_device(bus->devfreq);  in exynos_bus_shutdown()
445 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_resume()  local
448 	ret = exynos_bus_enable_edev(bus);  in exynos_bus_resume()
459 	struct exynos_bus *bus = dev_get_drvdata(dev);  in exynos_bus_suspend()  local
462 	ret = exynos_bus_disable_edev(bus);  in exynos_bus_suspend()
477 	{ .compatible = "samsung,exynos-bus", },
486 		.name	= "exynos-bus",
493 MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");