1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
6  * Author: J Keerthy <j-keerthy@ti.com>
7  * Author: Moiz Sonasath <m-sonasath@ti.com>
36 #include "ti-bandgap.h"
47  * ti_bandgap_readl() - simple read helper function
56 	return readl(bgp->base + reg);  in ti_bandgap_readl()
60  * ti_bandgap_writel() - simple write helper function
69 	writel(val, bgp->base + reg);  in ti_bandgap_writel()
75  * RMW_BITS() - used to read, modify and update bandgap bitfields.
83 	t = bgp->conf->sensors[(id)].registers;		\
84 	r = ti_bandgap_readl(bgp, t->reg);			\
85 	r &= ~t->mask;						\
86 	r |= (val) << __ffs(t->mask);				\
87 	ti_bandgap_writel(bgp, r, t->reg);			\
93  * ti_bandgap_power() - controls the power state of a bandgap device
95  * @on: desired power state (1 - on, 0 - off)
100  * Return: 0 on success, -ENOTSUPP if tempsoff is not supported.
107 		return -ENOTSUPP;  in ti_bandgap_power()
109 	for (i = 0; i < bgp->conf->sensor_count; i++)  in ti_bandgap_power()
116  * ti_errata814_bandgap_read_temp() - helper function to read dra7 sensor temperature
122  * corrupted" - Errata ID: i814".
147  * ti_bandgap_read_temp() - helper function to read sensor temperature
163 	tsr = bgp->conf->sensors[id].registers;  in ti_bandgap_read_temp()
164 	reg = tsr->temp_sensor_ctrl;  in ti_bandgap_read_temp()
172 		reg = tsr->ctrl_dtemp_1;  in ti_bandgap_read_temp()
181 	temp &= tsr->bgap_dtemp_mask;  in ti_bandgap_read_temp()
192  * ti_bandgap_talert_irq_handler() - handles Temperature alert IRQs
211 	spin_lock(&bgp->lock);  in ti_bandgap_talert_irq_handler()
212 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_talert_irq_handler()
213 		tsr = bgp->conf->sensors[i].registers;  in ti_bandgap_talert_irq_handler()
214 		ctrl = ti_bandgap_readl(bgp, tsr->bgap_status);  in ti_bandgap_talert_irq_handler()
217 		t_hot = ctrl & tsr->status_hot_mask;  in ti_bandgap_talert_irq_handler()
220 		t_cold = ctrl & tsr->status_cold_mask;  in ti_bandgap_talert_irq_handler()
225 		ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);  in ti_bandgap_talert_irq_handler()
232 			ctrl &= ~tsr->mask_hot_mask;  in ti_bandgap_talert_irq_handler()
233 			ctrl |= tsr->mask_cold_mask;  in ti_bandgap_talert_irq_handler()
235 			ctrl &= ~tsr->mask_cold_mask;  in ti_bandgap_talert_irq_handler()
236 			ctrl |= tsr->mask_hot_mask;  in ti_bandgap_talert_irq_handler()
239 		ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl);  in ti_bandgap_talert_irq_handler()
241 		dev_dbg(bgp->dev,  in ti_bandgap_talert_irq_handler()
243 			__func__, bgp->conf->sensors[i].domain,  in ti_bandgap_talert_irq_handler()
247 		if (bgp->conf->report_temperature)  in ti_bandgap_talert_irq_handler()
248 			bgp->conf->report_temperature(bgp, i);  in ti_bandgap_talert_irq_handler()
250 	spin_unlock(&bgp->lock);  in ti_bandgap_talert_irq_handler()
256  * ti_bandgap_tshut_irq_handler() - handles Temperature shutdown signal
276 /***   Helper functions which manipulate conversion ADC <-> mi Celsius   ***/
279  * ti_bandgap_adc_to_mcelsius() - converts an ADC value to mCelsius scale
285  * is out of the ADC conv table range, it returns -ERANGE, 0 on success.
288  * Return: 0 if conversion was successful, else -ERANGE in case the @adc_val
294 	const struct ti_bandgap_data *conf = bgp->conf;  in ti_bandgap_adc_to_mcelsius()
297 	if (adc_val < conf->adc_start_val || adc_val > conf->adc_end_val)  in ti_bandgap_adc_to_mcelsius()
298 		return -ERANGE;  in ti_bandgap_adc_to_mcelsius()
300 	*t = bgp->conf->conv_table[adc_val - conf->adc_start_val];  in ti_bandgap_adc_to_mcelsius()
305  * ti_bandgap_validate() - helper to check the sanity of a struct ti_bandgap
312  * Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if
319 		return -EINVAL;  in ti_bandgap_validate()
322 	if ((id < 0) || (id >= bgp->conf->sensor_count)) {  in ti_bandgap_validate()
323 		dev_err(bgp->dev, "%s: sensor id out of range (%d)\n",  in ti_bandgap_validate()
325 		return -ERANGE;  in ti_bandgap_validate()
332  * ti_bandgap_read_counter() - read the sensor counter
343 	tsr = bgp->conf->sensors[id].registers;  in ti_bandgap_read_counter()
344 	time = ti_bandgap_readl(bgp, tsr->bgap_counter);  in ti_bandgap_read_counter()
345 	time = (time & tsr->counter_mask) >>  in ti_bandgap_read_counter()
346 					__ffs(tsr->counter_mask);  in ti_bandgap_read_counter()
347 	time = time * 1000 / bgp->clk_rate;  in ti_bandgap_read_counter()
352  * ti_bandgap_read_counter_delay() - read the sensor counter delay
363 	tsr = bgp->conf->sensors[id].registers;  in ti_bandgap_read_counter_delay()
365 	reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl);  in ti_bandgap_read_counter_delay()
366 	reg_val = (reg_val & tsr->mask_counter_delay_mask) >>  in ti_bandgap_read_counter_delay()
367 				__ffs(tsr->mask_counter_delay_mask);  in ti_bandgap_read_counter_delay()
388 		dev_warn(bgp->dev, "Wrong counter delay value read from register %X",  in ti_bandgap_read_counter_delay()
394  * ti_bandgap_read_update_interval() - read the sensor update interval
412 		ret = -ENOTSUPP;  in ti_bandgap_read_update_interval()
427  * ti_bandgap_write_counter_delay() - set the counter_delay
459 		dev_warn(bgp->dev, "Delay %d ms is not supported\n", interval);  in ti_bandgap_write_counter_delay()
460 		return -EINVAL;  in ti_bandgap_write_counter_delay()
463 	spin_lock(&bgp->lock);  in ti_bandgap_write_counter_delay()
465 	spin_unlock(&bgp->lock);  in ti_bandgap_write_counter_delay()
471  * ti_bandgap_write_counter() - set the bandgap sensor counter
479 	interval = interval * bgp->clk_rate / 1000;  in ti_bandgap_write_counter()
480 	spin_lock(&bgp->lock);  in ti_bandgap_write_counter()
482 	spin_unlock(&bgp->lock);  in ti_bandgap_write_counter()
486  * ti_bandgap_write_update_interval() - set the update interval
502 		ret = -ENOTSUPP;  in ti_bandgap_write_update_interval()
517  * ti_bandgap_read_temperature() - report current temperature
540 	spin_lock(&bgp->lock);  in ti_bandgap_read_temperature()
542 	spin_unlock(&bgp->lock);  in ti_bandgap_read_temperature()
546 		return -EIO;  in ti_bandgap_read_temperature()
554  * ti_bandgap_set_sensor_data() - helper function to store thermal
568 	bgp->regval[id].data = data;  in ti_bandgap_set_sensor_data()
574  * ti_bandgap_get_sensor_data() - helper function to get thermal
587 	return bgp->regval[id].data;  in ti_bandgap_get_sensor_data()
593  * ti_bandgap_force_single_read() - executes 1 single ADC conversion
616 	tsr = bgp->conf->sensors[id].registers;  in ti_bandgap_force_single_read()
618 	while (--counter) {  in ti_bandgap_force_single_read()
619 		if (ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &  in ti_bandgap_force_single_read()
620 		    tsr->bgap_eocz_mask)  in ti_bandgap_force_single_read()
629 	while (--counter) {  in ti_bandgap_force_single_read()
630 		if (!(ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &  in ti_bandgap_force_single_read()
631 		      tsr->bgap_eocz_mask))  in ti_bandgap_force_single_read()
639  * ti_bandgap_set_continuous_mode() - One time enabling of continuous mode
653 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_set_continuous_mode()
663  * ti_bandgap_get_trend() - To fetch the temperature trend of a sensor
671  * are read from the buffer and for those without the Buffer -ENOTSUPP is
689 		ret = -ENOTSUPP;  in ti_bandgap_get_trend()
693 	spin_lock(&bgp->lock);  in ti_bandgap_get_trend()
695 	tsr = bgp->conf->sensors[id].registers;  in ti_bandgap_get_trend()
699 	reg1 = tsr->ctrl_dtemp_1;  in ti_bandgap_get_trend()
700 	reg2 = tsr->ctrl_dtemp_2;  in ti_bandgap_get_trend()
704 	temp1 &= tsr->bgap_dtemp_mask;  in ti_bandgap_get_trend()
707 	temp2 &= tsr->bgap_dtemp_mask;  in ti_bandgap_get_trend()
727 	*trend = (t1 - t2) / interval;  in ti_bandgap_get_trend()
729 	dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n",  in ti_bandgap_get_trend()
734 	spin_unlock(&bgp->lock);  in ti_bandgap_get_trend()
740  * ti_bandgap_tshut_init() - setup and initialize tshut handling
758 	status = request_irq(gpiod_to_irq(bgp->tshut_gpiod),  in ti_bandgap_tshut_init()
762 		dev_err(bgp->dev, "request irq failed for TSHUT");  in ti_bandgap_tshut_init()
768  * ti_bandgap_alert_init() - setup and initialize talert handling
785 	bgp->irq = platform_get_irq(pdev, 0);  in ti_bandgap_talert_init()
786 	if (bgp->irq < 0)  in ti_bandgap_talert_init()
787 		return bgp->irq;  in ti_bandgap_talert_init()
789 	ret = request_threaded_irq(bgp->irq, NULL,  in ti_bandgap_talert_init()
794 		dev_err(&pdev->dev, "Request threaded irq failed.\n");  in ti_bandgap_talert_init()
803  * ti_bandgap_build() - parse DT and setup a struct ti_bandgap
815 	struct device_node *node = pdev->dev.of_node;  in ti_bandgap_build()
823 		dev_err(&pdev->dev, "no platform information available\n");  in ti_bandgap_build()
824 		return ERR_PTR(-EINVAL);  in ti_bandgap_build()
827 	bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);  in ti_bandgap_build()
829 		return ERR_PTR(-ENOMEM);  in ti_bandgap_build()
831 	of_id = of_match_device(of_ti_bandgap_match, &pdev->dev);  in ti_bandgap_build()
833 		bgp->conf = of_id->data;  in ti_bandgap_build()
836 	bgp->regval = devm_kcalloc(&pdev->dev, bgp->conf->sensor_count,  in ti_bandgap_build()
837 				   sizeof(*bgp->regval), GFP_KERNEL);  in ti_bandgap_build()
838 	if (!bgp->regval)  in ti_bandgap_build()
839 		return ERR_PTR(-ENOMEM);  in ti_bandgap_build()
848 		chunk = devm_ioremap_resource(&pdev->dev, res);  in ti_bandgap_build()
850 			bgp->base = chunk;  in ti_bandgap_build()
858 		bgp->tshut_gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);  in ti_bandgap_build()
859 		if (IS_ERR(bgp->tshut_gpiod)) {  in ti_bandgap_build()
860 			dev_err(&pdev->dev, "invalid gpio for tshut\n");  in ti_bandgap_build()
861 			return ERR_CAST(bgp->tshut_gpiod);  in ti_bandgap_build()
889 		dev_err(&pdev->dev, "failed to fetch platform data\n");  in ti_bandgap_probe()
892 	bgp->dev = &pdev->dev;  in ti_bandgap_probe()
895 		dev_warn(&pdev->dev,  in ti_bandgap_probe()
901 			dev_err(&pdev->dev,  in ti_bandgap_probe()
907 	bgp->fclock = clk_get(NULL, bgp->conf->fclock_name);  in ti_bandgap_probe()
908 	if (IS_ERR(bgp->fclock)) {  in ti_bandgap_probe()
909 		dev_err(&pdev->dev, "failed to request fclock reference\n");  in ti_bandgap_probe()
910 		ret = PTR_ERR(bgp->fclock);  in ti_bandgap_probe()
914 	bgp->div_clk = clk_get(NULL, bgp->conf->div_ck_name);  in ti_bandgap_probe()
915 	if (IS_ERR(bgp->div_clk)) {  in ti_bandgap_probe()
916 		dev_err(&pdev->dev, "failed to request div_ts_ck clock ref\n");  in ti_bandgap_probe()
917 		ret = PTR_ERR(bgp->div_clk);  in ti_bandgap_probe()
921 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_probe()
925 		tsr = bgp->conf->sensors[i].registers;  in ti_bandgap_probe()
927 		 * check if the efuse has a non-zero value if not  in ti_bandgap_probe()
931 		val = ti_bandgap_readl(bgp, tsr->bgap_efuse);  in ti_bandgap_probe()
933 			dev_info(&pdev->dev,  in ti_bandgap_probe()
934 				 "Non-trimmed BGAP, Temp not accurate\n");  in ti_bandgap_probe()
937 	clk_rate = clk_round_rate(bgp->div_clk,  in ti_bandgap_probe()
938 				  bgp->conf->sensors[0].ts_data->max_freq);  in ti_bandgap_probe()
939 	if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq ||  in ti_bandgap_probe()
941 		ret = -ENODEV;  in ti_bandgap_probe()
942 		dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);  in ti_bandgap_probe()
946 	ret = clk_set_rate(bgp->div_clk, clk_rate);  in ti_bandgap_probe()
948 		dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");  in ti_bandgap_probe()
950 	bgp->clk_rate = clk_rate;  in ti_bandgap_probe()
952 		clk_prepare_enable(bgp->fclock);  in ti_bandgap_probe()
955 	spin_lock_init(&bgp->lock);  in ti_bandgap_probe()
956 	bgp->dev = &pdev->dev;  in ti_bandgap_probe()
963 		for (i = 0; i < bgp->conf->sensor_count; i++)  in ti_bandgap_probe()
966 	/* Set default thresholds for alert and shutdown */  in ti_bandgap_probe()
967 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_probe()
970 		ts_data = bgp->conf->sensors[i].ts_data;  in ti_bandgap_probe()
975 				 threshold_tcold_mask, ts_data->t_cold);  in ti_bandgap_probe()
977 				 threshold_thot_mask, ts_data->t_hot);  in ti_bandgap_probe()
978 			/* Enable the alert events */  in ti_bandgap_probe()
986 				 tshut_hot_mask, ts_data->tshut_hot);  in ti_bandgap_probe()
988 				 tshut_cold_mask, ts_data->tshut_cold);  in ti_bandgap_probe()
997 		for (i = 0; i < bgp->conf->sensor_count; i++)  in ti_bandgap_probe()
999 				 bgp->clk_rate / 4);  in ti_bandgap_probe()
1002 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_probe()
1005 		if (bgp->conf->sensors[i].register_cooling) {  in ti_bandgap_probe()
1006 			ret = bgp->conf->sensors[i].register_cooling(bgp, i);  in ti_bandgap_probe()
1011 		if (bgp->conf->expose_sensor) {  in ti_bandgap_probe()
1012 			domain = bgp->conf->sensors[i].domain;  in ti_bandgap_probe()
1013 			ret = bgp->conf->expose_sensor(bgp, i, domain);  in ti_bandgap_probe()
1027 			dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");  in ti_bandgap_probe()
1028 			i = bgp->conf->sensor_count;  in ti_bandgap_probe()
1034 	bgp->nb.notifier_call = bandgap_omap_cpu_notifier;  in ti_bandgap_probe()
1036 		cpu_pm_register_notifier(&bgp->nb);  in ti_bandgap_probe()
1042 	if (bgp->conf->sensors[i].unregister_cooling)  in ti_bandgap_probe()
1043 		bgp->conf->sensors[i].unregister_cooling(bgp, i);  in ti_bandgap_probe()
1045 	for (i--; i >= 0; i--) {  in ti_bandgap_probe()
1046 		if (bgp->conf->sensors[i].unregister_cooling)  in ti_bandgap_probe()
1047 			bgp->conf->sensors[i].unregister_cooling(bgp, i);  in ti_bandgap_probe()
1048 		if (bgp->conf->remove_sensor)  in ti_bandgap_probe()
1049 			bgp->conf->remove_sensor(bgp, i);  in ti_bandgap_probe()
1054 		clk_disable_unprepare(bgp->fclock);  in ti_bandgap_probe()
1056 	clk_put(bgp->div_clk);  in ti_bandgap_probe()
1058 	clk_put(bgp->fclock);  in ti_bandgap_probe()
1061 		free_irq(gpiod_to_irq(bgp->tshut_gpiod), NULL);  in ti_bandgap_probe()
1073 		cpu_pm_unregister_notifier(&bgp->nb);  in ti_bandgap_remove()
1076 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_remove()
1077 		if (bgp->conf->sensors[i].unregister_cooling)  in ti_bandgap_remove()
1078 			bgp->conf->sensors[i].unregister_cooling(bgp, i);  in ti_bandgap_remove()
1080 		if (bgp->conf->remove_sensor)  in ti_bandgap_remove()
1081 			bgp->conf->remove_sensor(bgp, i);  in ti_bandgap_remove()
1087 		clk_disable_unprepare(bgp->fclock);  in ti_bandgap_remove()
1088 	clk_put(bgp->fclock);  in ti_bandgap_remove()
1089 	clk_put(bgp->div_clk);  in ti_bandgap_remove()
1092 		free_irq(bgp->irq, bgp);  in ti_bandgap_remove()
1095 		free_irq(gpiod_to_irq(bgp->tshut_gpiod), NULL);  in ti_bandgap_remove()
1105 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_save_ctxt()
1109 		rval = &bgp->regval[i];  in ti_bandgap_save_ctxt()
1110 		tsr = bgp->conf->sensors[i].registers;  in ti_bandgap_save_ctxt()
1113 			rval->bg_mode_ctrl = ti_bandgap_readl(bgp,  in ti_bandgap_save_ctxt()
1114 							tsr->bgap_mode_ctrl);  in ti_bandgap_save_ctxt()
1116 			rval->bg_counter = ti_bandgap_readl(bgp,  in ti_bandgap_save_ctxt()
1117 							tsr->bgap_counter);  in ti_bandgap_save_ctxt()
1119 			rval->bg_threshold = ti_bandgap_readl(bgp,  in ti_bandgap_save_ctxt()
1120 							tsr->bgap_threshold);  in ti_bandgap_save_ctxt()
1121 			rval->bg_ctrl = ti_bandgap_readl(bgp,  in ti_bandgap_save_ctxt()
1122 						   tsr->bgap_mask_ctrl);  in ti_bandgap_save_ctxt()
1126 			rval->tshut_threshold = ti_bandgap_readl(bgp,  in ti_bandgap_save_ctxt()
1127 						   tsr->tshut_threshold);  in ti_bandgap_save_ctxt()
1137 	for (i = 0; i < bgp->conf->sensor_count; i++) {  in ti_bandgap_restore_ctxt()
1142 		rval = &bgp->regval[i];  in ti_bandgap_restore_ctxt()
1143 		tsr = bgp->conf->sensors[i].registers;  in ti_bandgap_restore_ctxt()
1146 			val = ti_bandgap_readl(bgp, tsr->bgap_counter);  in ti_bandgap_restore_ctxt()
1149 			ti_bandgap_writel(bgp, rval->tshut_threshold,  in ti_bandgap_restore_ctxt()
1150 					  tsr->tshut_threshold);  in ti_bandgap_restore_ctxt()
1157 			ti_bandgap_writel(bgp, rval->bg_counter,  in ti_bandgap_restore_ctxt()
1158 					  tsr->bgap_counter);  in ti_bandgap_restore_ctxt()
1160 			ti_bandgap_writel(bgp, rval->bg_mode_ctrl,  in ti_bandgap_restore_ctxt()
1161 					  tsr->bgap_mode_ctrl);  in ti_bandgap_restore_ctxt()
1163 			ti_bandgap_writel(bgp, rval->bg_threshold,  in ti_bandgap_restore_ctxt()
1164 					  tsr->bgap_threshold);  in ti_bandgap_restore_ctxt()
1165 			ti_bandgap_writel(bgp, rval->bg_ctrl,  in ti_bandgap_restore_ctxt()
1166 					  tsr->bgap_mask_ctrl);  in ti_bandgap_restore_ctxt()
1182 		clk_disable_unprepare(bgp->fclock);  in ti_bandgap_suspend()
1184 	bgp->is_suspended = true;  in ti_bandgap_suspend()
1196 	spin_lock(&bgp->lock);  in bandgap_omap_cpu_notifier()
1199 		if (bgp->is_suspended)  in bandgap_omap_cpu_notifier()
1204 			clk_disable(bgp->fclock);  in bandgap_omap_cpu_notifier()
1208 		if (bgp->is_suspended)  in bandgap_omap_cpu_notifier()
1211 			clk_enable(bgp->fclock);  in bandgap_omap_cpu_notifier()
1216 	spin_unlock(&bgp->lock);  in bandgap_omap_cpu_notifier()
1226 		clk_prepare_enable(bgp->fclock);  in ti_bandgap_resume()
1229 	bgp->is_suspended = false;  in ti_bandgap_resume()
1244 		.compatible = "ti,omap34xx-bandgap",
1248 		.compatible = "ti,omap36xx-bandgap",
1254 		.compatible = "ti,omap4430-bandgap",
1258 		.compatible = "ti,omap4460-bandgap",
1262 		.compatible = "ti,omap4470-bandgap",
1268 		.compatible = "ti,omap5430-bandgap",
1274 		.compatible = "ti,dra752-bandgap",
1287 			.name = "ti-soc-thermal",
1297 MODULE_ALIAS("platform:ti-soc-thermal");