1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
34  * kitchen-sinked this device, not us. :)
46  * source describing i.MX6 SoCs, and in the linux and u-boot code which comes
51  * units (higher counts are lower temperatures).  Items with '_val' in the name
52  * are deci-Celsius, which are converted to/from deci-Kelvins in the sysctl
81 	{ -1, 0 }
136  * value (0-3) from the ocotp CFG3 register into a mhz value that can be looked
141 #define	TZ_ZEROC	2731	/* deci-Kelvin <-> deci-Celsius offset. */
149 	return (bus_read_4(imx6_anatop_sc->res[MEMRES], offset));  in imx6_anatop_read_4()
158 	bus_write_4(imx6_anatop_sc->res[MEMRES], offset, value);  in imx6_anatop_write_4()
184 		newtarg = (mv - 700) / 25;  in vdd_set()
190 	 * (1150-700/25=18).  in vdd_set()
199 	 * going from 400->1200, but works for smaller changes).  in vdd_set()
205 			delay = (newtarg - oldtarg) * 6;  in vdd_set()
226 	sc->cpu_curmv = newtarg * 25 + 700;  in vdd_set()
234 	return ((sc->refosc_mhz * (plldiv / 2)) / (corediv + 1));  in cpufreq_mhz_from_div()
243 	*plldiv = ((*corediv + 1) * cpu_mhz) / (sc->refosc_mhz / 2);  in cpufreq_mhz_to_div()
260 	if (cpu_newmhz > sc->cpu_maxmhz_hw && !sc->cpu_overclock_enable)  in cpufreq_nearest_oppt()
261 		cpu_newmhz = sc->cpu_maxmhz_hw;  in cpufreq_nearest_oppt()
266 		d = abs((int)cpu_newmhz - (int)imx6_oppt_table[i].mhz);  in cpufreq_nearest_oppt()
281 	if (op->mhz > sc->cpu_curmhz) {  in cpufreq_set_clock()
282 		vdd_set(sc, op->mv);  in cpufreq_set_clock()
288 	 *  - Set the bypass clock source to REF_CLK_24M (source #0).  in cpufreq_set_clock()
289 	 *  - Set the PLL into bypass mode; cpu should now be running at 24mhz.  in cpufreq_set_clock()
290 	 *  - Change the divisor.  in cpufreq_set_clock()
291 	 *  - Wait for the LOCK bit to come on; it takes ~50 loop iterations.  in cpufreq_set_clock()
292 	 *  - Turn off bypass mode; cpu should now be running at the new speed.  in cpufreq_set_clock()
294 	cpufreq_mhz_to_div(sc, op->mhz, &corediv, &plldiv);  in cpufreq_set_clock()
308 		if (--timeout == 0)  in cpufreq_set_clock()
315 	/* If lowering the frequency, it is now safe to lower the voltage. */  in cpufreq_set_clock()
316 	if (op->mhz < sc->cpu_curmhz)  in cpufreq_set_clock()
317 		vdd_set(sc, op->mv);  in cpufreq_set_clock()
318 	sc->cpu_curmhz = op->mhz;  in cpufreq_set_clock()
322 	    cpufreq_actual_mhz(sc, sc->cpu_curmhz) * 1000000 / 2);  in cpufreq_set_clock()
335 	temp = sc->cpu_minmhz;  in cpufreq_sysctl_minmhz()
337 	if (err != 0 || req->newptr == NULL)  in cpufreq_sysctl_minmhz()
341 	if (op->mhz > sc->cpu_maxmhz)  in cpufreq_sysctl_minmhz()
343 	else if (op->mhz == sc->cpu_minmhz)  in cpufreq_sysctl_minmhz()
350 	sc->cpu_minmhz = op->mhz;  in cpufreq_sysctl_minmhz()
351 	if (sc->cpu_minmhz > sc->cpu_curmhz) {  in cpufreq_sysctl_minmhz()
367 	temp = sc->cpu_maxmhz;  in cpufreq_sysctl_maxmhz()
369 	if (err != 0 || req->newptr == NULL)  in cpufreq_sysctl_maxmhz()
373 	if (op->mhz < sc->cpu_minmhz)  in cpufreq_sysctl_maxmhz()
375 	else if (op->mhz == sc->cpu_maxmhz)  in cpufreq_sysctl_maxmhz()
382 	 *  whether it is higher or lower than the old max.  in cpufreq_sysctl_maxmhz()
384 	sc->cpu_maxmhz = op->mhz;  in cpufreq_sysctl_maxmhz()
397 	    OID_AUTO, "cpu_mhz", CTLFLAG_RD, &sc->cpu_curmhz, 0,   in cpufreq_initialize()
411 	    OID_AUTO, "cpu_maxmhz_hw", CTLFLAG_RD, &sc->cpu_maxmhz_hw, 0,   in cpufreq_initialize()
416 	    &sc->cpu_overclock_enable, 0,   in cpufreq_initialize()
420 	 * XXX 24mhz shouldn't be hard-coded, should get this from imx6_ccm  in cpufreq_initialize()
424 	sc->refosc_mhz = 24;  in cpufreq_initialize()
430 	 *   - 2b'11: 1200000000Hz;  in cpufreq_initialize()
431 	 *   - 2b'10: 996000000Hz;  in cpufreq_initialize()
432 	 *   - 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz.  in cpufreq_initialize()
433 	 *   - 2b'00: 792000000Hz;  in cpufreq_initialize()
438 	sc->cpu_maxmhz_hw = imx6_ocotp_mhz_tab[cfg3speed];  in cpufreq_initialize()
439 	sc->cpu_maxmhz = sc->cpu_maxmhz_hw;  in cpufreq_initialize()
441 	TUNABLE_INT_FETCH("hw.imx6.cpu_minmhz", &sc->cpu_minmhz);  in cpufreq_initialize()
442 	op = cpufreq_nearest_oppt(sc, sc->cpu_minmhz);  in cpufreq_initialize()
443 	sc->cpu_minmhz = op->mhz;  in cpufreq_initialize()
444 	sc->cpu_minmv = op->mv;  in cpufreq_initialize()
446 	TUNABLE_INT_FETCH("hw.imx6.cpu_maxmhz", &sc->cpu_maxmhz);  in cpufreq_initialize()
447 	op = cpufreq_nearest_oppt(sc, sc->cpu_maxmhz);  in cpufreq_initialize()
448 	sc->cpu_maxmhz = op->mhz;  in cpufreq_initialize()
449 	sc->cpu_maxmv = op->mv;  in cpufreq_initialize()
466 	return (((sc->temp_high_val - (count - sc->temp_high_cnt) *  in temp_from_count()
467 	    (sc->temp_high_val - 250) /   in temp_from_count()
468 	    (sc->temp_room_cnt - sc->temp_high_cnt))));  in temp_from_count()
475 	return ((sc->temp_room_cnt - sc->temp_high_cnt) *   in temp_to_count()
476 	    (sc->temp_high_val - temp) / (sc->temp_high_val - 250) +   in temp_to_count()
477 	    sc->temp_high_cnt);  in temp_to_count()
488 	sc->temp_last_cnt =  in temp_update_count()
501 	t = temp_from_count(sc, sc->temp_last_cnt) + TZ_ZEROC;  in temp_sysctl_handler()
513 	temp = sc->temp_throttle_val + TZ_ZEROC;  in temp_throttle_sysctl_handler()
517 	temp -= TZ_ZEROC;  in temp_throttle_sysctl_handler()
518 	if (err != 0 || req->newptr == NULL || temp == sc->temp_throttle_val)  in temp_throttle_sysctl_handler()
522 	sc->temp_throttle_val = temp;  in temp_throttle_sysctl_handler()
523 	sc->temp_throttle_trigger_cnt = temp_to_count(sc, sc->temp_throttle_val);  in temp_throttle_sysctl_handler()
524 	sc->temp_throttle_reset_cnt = temp_to_count(sc, sc->temp_throttle_val - 100);  in temp_throttle_sysctl_handler()
528 	    (sc->temp_throttle_trigger_cnt <<  in temp_throttle_sysctl_handler()
537 	if (sc->cpu_curmhz < sc->cpu_maxmhz) {  in tempmon_gofast()
538 		cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_maxmhz));  in tempmon_gofast()
546 	if (sc->cpu_curmhz > sc->cpu_minmhz) {  in tempmon_goslow()
547 		cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_minmhz));  in tempmon_goslow()
571 	/* Lower counts are higher temperatures. */  in tempmon_throttle_check()
572 	if (sc->temp_last_cnt < sc->temp_throttle_trigger_cnt)  in tempmon_throttle_check()
574 	else if (sc->temp_last_cnt > (sc->temp_throttle_reset_cnt))  in tempmon_throttle_check()
577 	callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay,  in tempmon_throttle_check()
585 	uint32_t cal;  in initialize_tempmon()  local
591 	cal = fsl_ocotp_read_4(FSL_OCOTP_ANA1);  in initialize_tempmon()
592 	sc->temp_room_cnt = (cal & 0xFFF00000) >> 20;  in initialize_tempmon()
593 	sc->temp_high_cnt = (cal & 0x000FFF00) >> 8;  in initialize_tempmon()
594 	sc->temp_high_val = (cal & 0x000000FF) * 10;  in initialize_tempmon()
597 	 * Throttle to a lower cpu freq at 10C below the "hot" temperature, and  in initialize_tempmon()
600 	sc->temp_throttle_val = sc->temp_high_val - 100;  in initialize_tempmon()
601 	sc->temp_throttle_trigger_cnt =  in initialize_tempmon()
602 	    temp_to_count(sc, sc->temp_throttle_val);  in initialize_tempmon()
603 	sc->temp_throttle_reset_cnt =   in initialize_tempmon()
604 	    temp_to_count(sc, sc->temp_throttle_val - 50);  in initialize_tempmon()
612 	    (sc->temp_throttle_trigger_cnt <<   in initialize_tempmon()
617 	 * XXX Note that the alarm-interrupt feature isn't working yet, so  in initialize_tempmon()
622 	while (sc->temp_last_cnt == 0)  in initialize_tempmon()
624 	sc->temp_throttle_delay = 100 * SBT_1MS;  in initialize_tempmon()
625 	callout_init(&sc->temp_throttle_callout, 0);  in initialize_tempmon()
626 	callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay,   in initialize_tempmon()
648 	sc->res[IRQRES] = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ, &rid,  in intr_setup()
650 	if (sc->res[IRQRES] != NULL) {  in intr_setup()
651 		bus_setup_intr(sc->dev, sc->res[IRQRES],  in intr_setup()
653 		    &sc->temp_intrhand);  in intr_setup()
655 		device_printf(sc->dev, "Cannot allocate IRQ resource\n");  in intr_setup()
657 	config_intrhook_disestablish(&sc->intr_setup_hook);  in intr_setup()
673 	if (!sc->cpu_init_done && bus_get_pass() >= cpu_init_pass) {  in imx6_anatop_new_pass()
674 		sc->cpu_init_done = true;  in imx6_anatop_new_pass()
678 			device_printf(sc->dev, "CPU %uMHz @ %umV\n",   in imx6_anatop_new_pass()
679 			    sc->cpu_curmhz, sc->cpu_curmv);  in imx6_anatop_new_pass()
700 	sc->dev = dev;  in imx6_anatop_attach()
703 	if (bus_alloc_resources(dev, imx6_anatop_spec, sc->res)) {  in imx6_anatop_attach()
709 	sc->intr_setup_hook.ich_func = intr_setup;  in imx6_anatop_attach()
710 	sc->intr_setup_hook.ich_arg = sc;  in imx6_anatop_attach()
711 	config_intrhook_establish(&sc->intr_setup_hook);  in imx6_anatop_attach()
713 	SYSCTL_ADD_UINT(device_get_sysctl_ctx(sc->dev),  in imx6_anatop_attach()
714 	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),  in imx6_anatop_attach()
716 	    &sc->cpu_curmv, 0, "Current CPU voltage in millivolts");  in imx6_anatop_attach()
740 		bus_release_resources(dev, imx6_anatop_spec, sc->res);  in imx6_anatop_attach()
774 	if (ofw_bus_is_compatible(dev, "fsl,imx6q-anatop") == 0)  in imx6_anatop_probe()