1 // SPDX-License-Identifier: GPL-2.0
2 /* bbc_envctrl.c: UltraSPARC-III environment control driver.
26 /* Two temperature sensors exist in the SunBLADE-1000 enclosure.
29  * for the ambient temperature.
31  * The max1617 is capable of being programmed with power-off
33  * can be controlled independently for the cpu or ambient temperature.
44  * disabled/enabled when entering/exiting the lowest power-saving
59  * before the hardware based power-off event is triggered.
62 /* These settings are in Celsius.  We use these defaults only
63  * if we cannot interrogate the cpu-fru SEEPROM.
71 	{ 100, 85, 80, 5, -5, -10 },
72 	{ 100, 85, 80, 5, -5, -10 },
76 	{ 65, 55, 40, 5, -5, -10 },
77 	{ 65, 55, 40, 5, -5, -10 },
95 	/* Put temperatures into range so we don't mis-program  in set_fan_speeds()
98 	if (fp->cpu_fan_speed < FAN_SPEED_MIN)  in set_fan_speeds()
99 		fp->cpu_fan_speed = FAN_SPEED_MIN;  in set_fan_speeds()
100 	if (fp->cpu_fan_speed > FAN_SPEED_MAX)  in set_fan_speeds()
101 		fp->cpu_fan_speed = FAN_SPEED_MAX;  in set_fan_speeds()
102 	if (fp->system_fan_speed < FAN_SPEED_MIN)  in set_fan_speeds()
103 		fp->system_fan_speed = FAN_SPEED_MIN;  in set_fan_speeds()
104 	if (fp->system_fan_speed > FAN_SPEED_MAX)  in set_fan_speeds()
105 		fp->system_fan_speed = FAN_SPEED_MAX;  in set_fan_speeds()
108 	       fp->index,  in set_fan_speeds()
109 	       fp->cpu_fan_speed, fp->system_fan_speed);  in set_fan_speeds()
112 	bbc_i2c_writeb(fp->client, fp->cpu_fan_speed, CPU_FAN_REG);  in set_fan_speeds()
113 	bbc_i2c_writeb(fp->client, fp->system_fan_speed, SYS_FAN_REG);  in set_fan_speeds()
114 	bbc_i2c_writeb(fp->client,  in set_fan_speeds()
115 		       (fp->psupply_fan_on ?  in set_fan_speeds()
122 	tp->prev_amb_temp = tp->curr_amb_temp;  in get_current_temps()
123 	bbc_i2c_readb(tp->client,  in get_current_temps()
124 		      (unsigned char *) &tp->curr_amb_temp,  in get_current_temps()
126 	tp->prev_cpu_temp = tp->curr_cpu_temp;  in get_current_temps()
127 	bbc_i2c_readb(tp->client,  in get_current_temps()
128 		      (unsigned char *) &tp->curr_cpu_temp,  in get_current_temps()
132 	       tp->index,  in get_current_temps()
133 	       (int) tp->curr_cpu_temp, (int) tp->curr_amb_temp);  in get_current_temps()
142 	s8 val = -1;  in do_envctrl_shutdown()
147 	if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||  in do_envctrl_shutdown()
148 	    tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {  in do_envctrl_shutdown()
149 		type = "ambient";  in do_envctrl_shutdown()
150 		val = tp->curr_amb_temp;  in do_envctrl_shutdown()
151 	} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||  in do_envctrl_shutdown()
152 		   tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {  in do_envctrl_shutdown()
154 		val = tp->curr_cpu_temp;  in do_envctrl_shutdown()
159 	       tp->index, type, val);  in do_envctrl_shutdown()
174 		if (tp->curr_amb_temp >=  in analyze_ambient_temp()
175 		    amb_temp_limits[tp->index].high_warn) {  in analyze_ambient_temp()
177 			       "Above safe ambient operating temperature, %d C.\n",  in analyze_ambient_temp()
178 			       tp->index, (int) tp->curr_amb_temp);  in analyze_ambient_temp()
180 		} else if (tp->curr_amb_temp <  in analyze_ambient_temp()
181 			   amb_temp_limits[tp->index].low_warn) {  in analyze_ambient_temp()
183 			       "Below safe ambient operating temperature, %d C.\n",  in analyze_ambient_temp()
184 			       tp->index, (int) tp->curr_amb_temp);  in analyze_ambient_temp()
189 	} else if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_warn ||  in analyze_ambient_temp()
190 		   tp->curr_amb_temp < amb_temp_limits[tp->index].low_warn)  in analyze_ambient_temp()
194 	if (tp->curr_amb_temp >= amb_temp_limits[tp->index].high_shutdown ||  in analyze_ambient_temp()
195 	    tp->curr_amb_temp < amb_temp_limits[tp->index].low_shutdown) {  in analyze_ambient_temp()
201 		tp->fan_todo[FAN_AMBIENT] = FAN_FULLBLAST;  in analyze_ambient_temp()
202 	} else if ((tick & (8 - 1)) == 0) {  in analyze_ambient_temp()
203 		s8 amb_goal_hi = amb_temp_limits[tp->index].high_warn - 10;  in analyze_ambient_temp()
206 		amb_goal_lo = amb_goal_hi - 3;  in analyze_ambient_temp()
209 		 * only try to deal with over-heating and fan noise reduction.  in analyze_ambient_temp()
211 		if (tp->avg_amb_temp < amb_goal_hi) {  in analyze_ambient_temp()
212 			if (tp->avg_amb_temp >= amb_goal_lo)  in analyze_ambient_temp()
213 				tp->fan_todo[FAN_AMBIENT] = FAN_SAME;  in analyze_ambient_temp()
215 				tp->fan_todo[FAN_AMBIENT] = FAN_SLOWER;  in analyze_ambient_temp()
217 			tp->fan_todo[FAN_AMBIENT] = FAN_FASTER;  in analyze_ambient_temp()
220 		tp->fan_todo[FAN_AMBIENT] = FAN_SAME;  in analyze_ambient_temp()
229 		if (tp->curr_cpu_temp >=  in analyze_cpu_temp()
230 		    cpu_temp_limits[tp->index].high_warn) {  in analyze_cpu_temp()
233 			       tp->index, (int) tp->curr_cpu_temp);  in analyze_cpu_temp()
235 		} else if (tp->curr_cpu_temp <  in analyze_cpu_temp()
236 			   cpu_temp_limits[tp->index].low_warn) {  in analyze_cpu_temp()
239 			       tp->index, (int) tp->curr_cpu_temp);  in analyze_cpu_temp()
244 	} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_warn ||  in analyze_cpu_temp()
245 		   tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_warn)  in analyze_cpu_temp()
249 	if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||  in analyze_cpu_temp()
250 	    tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {  in analyze_cpu_temp()
256 		tp->fan_todo[FAN_CPU] = FAN_FULLBLAST;  in analyze_cpu_temp()
257 	} else if ((tick & (8 - 1)) == 0) {  in analyze_cpu_temp()
258 		s8 cpu_goal_hi = cpu_temp_limits[tp->index].high_warn - 10;  in analyze_cpu_temp()
261 		cpu_goal_lo = cpu_goal_hi - 3;  in analyze_cpu_temp()
264 		 * only try to deal with over-heating and fan noise reduction.  in analyze_cpu_temp()
266 		if (tp->avg_cpu_temp < cpu_goal_hi) {  in analyze_cpu_temp()
267 			if (tp->avg_cpu_temp >= cpu_goal_lo)  in analyze_cpu_temp()
268 				tp->fan_todo[FAN_CPU] = FAN_SAME;  in analyze_cpu_temp()
270 				tp->fan_todo[FAN_CPU] = FAN_SLOWER;  in analyze_cpu_temp()
272 			tp->fan_todo[FAN_CPU] = FAN_FASTER;  in analyze_cpu_temp()
275 		tp->fan_todo[FAN_CPU] = FAN_SAME;  in analyze_cpu_temp()
281 	tp->avg_amb_temp = (s8)((int)((int)tp->avg_amb_temp + (int)tp->curr_amb_temp) / 2);  in analyze_temps()
282 	tp->avg_cpu_temp = (s8)((int)((int)tp->avg_cpu_temp + (int)tp->curr_cpu_temp) / 2);  in analyze_temps()
284 	analyze_ambient_temp(tp, last_warn, tp->sample_tick);  in analyze_temps()
285 	analyze_cpu_temp(tp, last_warn, tp->sample_tick);  in analyze_temps()
287 	tp->sample_tick++;  in analyze_temps()
300 		if (tp->fan_todo[which_fan] == FAN_FULLBLAST) {  in prioritize_fan_action()
304 		if (tp->fan_todo[which_fan] == FAN_SAME &&  in prioritize_fan_action()
307 		else if (tp->fan_todo[which_fan] == FAN_FASTER)  in prioritize_fan_action()
311 			 tp->fan_todo[which_fan] == FAN_SLOWER)  in prioritize_fan_action()
330 		if (fp->system_fan_speed >= FAN_SPEED_MAX)  in maybe_new_ambient_fan_speed()
333 			fp->system_fan_speed = FAN_SPEED_MAX;  in maybe_new_ambient_fan_speed()
336 			if (fp->system_fan_speed >= FAN_SPEED_MAX)  in maybe_new_ambient_fan_speed()
339 				fp->system_fan_speed += 2;  in maybe_new_ambient_fan_speed()
341 			int orig_speed = fp->system_fan_speed;  in maybe_new_ambient_fan_speed()
344 			    orig_speed <= (fp->cpu_fan_speed - 3))  in maybe_new_ambient_fan_speed()
347 				fp->system_fan_speed -= 1;  in maybe_new_ambient_fan_speed()
364 		if (fp->cpu_fan_speed >= FAN_SPEED_MAX)  in maybe_new_cpu_fan_speed()
367 			fp->cpu_fan_speed = FAN_SPEED_MAX;  in maybe_new_cpu_fan_speed()
370 			if (fp->cpu_fan_speed >= FAN_SPEED_MAX)  in maybe_new_cpu_fan_speed()
373 				fp->cpu_fan_speed += 2;  in maybe_new_cpu_fan_speed()
374 				if (fp->system_fan_speed <  in maybe_new_cpu_fan_speed()
375 				    (fp->cpu_fan_speed - 3))  in maybe_new_cpu_fan_speed()
376 					fp->system_fan_speed =  in maybe_new_cpu_fan_speed()
377 						fp->cpu_fan_speed - 3;  in maybe_new_cpu_fan_speed()
380 			if (fp->cpu_fan_speed <= FAN_SPEED_MIN)  in maybe_new_cpu_fan_speed()
383 				fp->cpu_fan_speed -= 1;  in maybe_new_cpu_fan_speed()
409 		fp->cpu_fan_speed = FAN_SPEED_MAX;  in fans_full_blast()
410 		fp->system_fan_speed = FAN_SPEED_MAX;  in fans_full_blast()
411 		fp->psupply_fan_on = 1;  in fans_full_blast()
423 	last_warning_jiffies = jiffies - WARN_INTERVAL;  in kenvctrld()
455 	INIT_LIST_HEAD(&tp->bp_list);  in attach_one_temp()
456 	INIT_LIST_HEAD(&tp->glob_list);  in attach_one_temp()
458 	tp->client = bbc_i2c_attach(bp, op);  in attach_one_temp()
459 	if (!tp->client) {  in attach_one_temp()
465 	tp->index = temp_idx;  in attach_one_temp()
467 	list_add(&tp->glob_list, &all_temps);  in attach_one_temp()
468 	list_add(&tp->bp_list, &bp->temps);  in attach_one_temp()
473 	bbc_i2c_writeb(tp->client, 0x00, MAX1617_WR_CFG_BYTE);  in attach_one_temp()
474 	bbc_i2c_writeb(tp->client, 0x02, MAX1617_WR_CVRATE_BYTE);  in attach_one_temp()
477 	bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].high_pwroff,  in attach_one_temp()
479 	bbc_i2c_writeb(tp->client, amb_temp_limits[tp->index].low_pwroff,  in attach_one_temp()
481 	bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].high_pwroff,  in attach_one_temp()
483 	bbc_i2c_writeb(tp->client, cpu_temp_limits[tp->index].low_pwroff,  in attach_one_temp()
487 	tp->prev_cpu_temp = tp->avg_cpu_temp = tp->curr_cpu_temp;  in attach_one_temp()
488 	tp->prev_amb_temp = tp->avg_amb_temp = tp->curr_amb_temp;  in attach_one_temp()
490 	tp->fan_todo[FAN_AMBIENT] = FAN_SAME;  in attach_one_temp()
491 	tp->fan_todo[FAN_CPU] = FAN_SAME;  in attach_one_temp()
503 	INIT_LIST_HEAD(&fp->bp_list);  in attach_one_fan()
504 	INIT_LIST_HEAD(&fp->glob_list);  in attach_one_fan()
506 	fp->client = bbc_i2c_attach(bp, op);  in attach_one_fan()
507 	if (!fp->client) {  in attach_one_fan()
512 	fp->index = fan_idx;  in attach_one_fan()
514 	list_add(&fp->glob_list, &all_fans);  in attach_one_fan()
515 	list_add(&fp->bp_list, &bp->fans);  in attach_one_fan()
517 	/* The i2c device controlling the fans is write-only.  in attach_one_fan()
523 	fp->psupply_fan_on = 1;  in attach_one_fan()
524 	fp->cpu_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;  in attach_one_fan()
525 	fp->cpu_fan_speed += FAN_SPEED_MIN;  in attach_one_fan()
526 	fp->system_fan_speed = (FAN_SPEED_MAX - FAN_SPEED_MIN) / 2;  in attach_one_fan()
527 	fp->system_fan_speed += FAN_SPEED_MIN;  in attach_one_fan()
534 	bbc_i2c_detach(tp->client);  in destroy_one_temp()
542 	list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) {  in destroy_all_temps()
543 		list_del(&tp->bp_list);  in destroy_all_temps()
544 		list_del(&tp->glob_list);  in destroy_all_temps()
551 	bbc_i2c_detach(fp->client);  in destroy_one_fan()
559 	list_for_each_entry_safe(fp, fpos, &bp->fans, bp_list) {  in destroy_all_fans()
560 		list_del(&fp->bp_list);  in destroy_all_fans()
561 		list_del(&fp->glob_list);  in destroy_all_fans()
574 		if (of_node_name_eq(op->dev.of_node, "temperature"))  in bbc_envctrl_init()
576 		if (of_node_name_eq(op->dev.of_node, "fan-control"))  in bbc_envctrl_init()