/*- * Copyright (c) 2013 Ian Lepore * Copyright (c) 2014 Steven Lawrance * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * Analog PLL and power regulator driver for Freescale i.MX6 family of SoCs. * Also, temperature montoring and cpu frequency control. It was Freescale who * kitchen-sinked this device, not us. :) * * We don't really do anything with analog PLLs, but the registers for * controlling them belong to the same block as the power regulator registers. * Since the newbus hierarchy makes it hard for anyone other than us to get at * them, we just export a couple public functions to allow the imx6 CCM clock * driver to read and write those registers. * * We also don't do anything about power regulation yet, but when the need * arises, this would be the place for that code to live. * * I have no idea where the "anatop" name comes from. It's in the standard DTS * source describing i.MX6 SoCs, and in the linux and u-boot code which comes * from Freescale, but it's not in the SoC manual. * * Note that temperature values throughout this code are handled in two types of * units. Items with '_cnt' in the name use the hardware temperature count * units (higher counts are lower temperatures). Items with '_val' in the name * are deci-Celcius, which are converted to/from deci-Kelvins in the sysctl * handlers (dK is the standard unit for temperature in sysctl). */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct resource_spec imx6_anatop_spec[] = { { SYS_RES_MEMORY, 0, RF_ACTIVE }, { SYS_RES_IRQ, 0, RF_ACTIVE }, { -1, 0 } }; #define MEMRES 0 #define IRQRES 1 struct imx6_anatop_softc { device_t dev; struct resource *res[2]; struct intr_config_hook intr_setup_hook; uint32_t cpu_curmhz; uint32_t cpu_curmv; uint32_t cpu_minmhz; uint32_t cpu_minmv; uint32_t cpu_maxmhz; uint32_t cpu_maxmv; uint32_t cpu_maxmhz_hw; boolean_t cpu_overclock_enable; boolean_t cpu_init_done; uint32_t refosc_mhz; void *temp_intrhand; uint32_t temp_high_val; uint32_t temp_high_cnt; uint32_t temp_last_cnt; uint32_t temp_room_cnt; struct callout temp_throttle_callout; sbintime_t temp_throttle_delay; uint32_t temp_throttle_reset_cnt; uint32_t temp_throttle_trigger_cnt; uint32_t temp_throttle_val; }; static struct imx6_anatop_softc *imx6_anatop_sc; /* * Table of "operating points". * These are combinations of frequency and voltage blessed by Freescale. * While the datasheet says the ARM voltage can be as low as 925mV at * 396MHz, it also says that the ARM and SOC voltages can't differ by * more than 200mV, and the minimum SOC voltage is 1150mV, so that * dictates the 950mV entry in this table. */ static struct oppt { uint32_t mhz; uint32_t mv; } imx6_oppt_table[] = { { 396, 950}, { 792, 1150}, { 852, 1225}, { 996, 1225}, {1200, 1275}, }; /* * Table of CPU max frequencies. This is used to translate the max frequency * value (0-3) from the ocotp CFG3 register into a mhz value that can be looked * up in the operating points table. */ static uint32_t imx6_ocotp_mhz_tab[] = {792, 852, 996, 1200}; #define TZ_ZEROC 2732 /* deci-Kelvin <-> deci-Celcius offset. */ uint32_t imx6_anatop_read_4(bus_size_t offset) { KASSERT(imx6_anatop_sc != NULL, ("imx6_anatop_read_4 sc NULL")); return (bus_read_4(imx6_anatop_sc->res[MEMRES], offset)); } void imx6_anatop_write_4(bus_size_t offset, uint32_t value) { KASSERT(imx6_anatop_sc != NULL, ("imx6_anatop_write_4 sc NULL")); bus_write_4(imx6_anatop_sc->res[MEMRES], offset, value); } static void vdd_set(struct imx6_anatop_softc *sc, int mv) { int newtarg, newtargSoc, oldtarg; uint32_t delay, pmureg; static boolean_t init_done = false; /* * The datasheet says VDD_PU and VDD_SOC must be equal, and VDD_ARM * can't be more than 50mV above or 200mV below them. We keep them the * same except in the case of the lowest operating point, which is * handled as a special case below. */ pmureg = imx6_anatop_read_4(IMX6_ANALOG_PMU_REG_CORE); oldtarg = pmureg & IMX6_ANALOG_PMU_REG0_TARG_MASK; /* Convert mV to target value. Clamp target to valid range. */ if (mv < 725) newtarg = 0x00; else if (mv > 1450) newtarg = 0x1F; else newtarg = (mv - 700) / 25; /* * The SOC voltage can't go below 1150mV, and thus because of the 200mV * rule, the ARM voltage can't go below 950mV. The 950 is encoded in * our oppt table, here we handle the SOC 1150 rule as a special case. * (1150-700/25=18). */ newtargSoc = (newtarg < 18) ? 18 : newtarg; /* * The first time through the 3 voltages might not be equal so use a * long conservative delay. After that we need to delay 3uS for every * 25mV step upward; we actually delay 6uS because empirically, it works * and the 3uS per step recommended by the docs doesn't (3uS fails when * going from 400->1200, but works for smaller changes). */ if (init_done) { if (newtarg == oldtarg) return; else if (newtarg > oldtarg) delay = (newtarg - oldtarg) * 6; else delay = 0; } else { delay = (700 / 25) * 6; init_done = true; } /* * Make the change and wait for it to take effect. */ pmureg &= ~(IMX6_ANALOG_PMU_REG0_TARG_MASK | IMX6_ANALOG_PMU_REG1_TARG_MASK | IMX6_ANALOG_PMU_REG2_TARG_MASK); pmureg |= newtarg << IMX6_ANALOG_PMU_REG0_TARG_SHIFT; pmureg |= newtarg << IMX6_ANALOG_PMU_REG1_TARG_SHIFT; pmureg |= newtargSoc << IMX6_ANALOG_PMU_REG2_TARG_SHIFT; imx6_anatop_write_4(IMX6_ANALOG_PMU_REG_CORE, pmureg); DELAY(delay); sc->cpu_curmv = newtarg * 25 + 700; } static inline uint32_t cpufreq_mhz_from_div(struct imx6_anatop_softc *sc, uint32_t corediv, uint32_t plldiv) { return ((sc->refosc_mhz * (plldiv / 2)) / (corediv + 1)); } static inline void cpufreq_mhz_to_div(struct imx6_anatop_softc *sc, uint32_t cpu_mhz, uint32_t *corediv, uint32_t *plldiv) { *corediv = (cpu_mhz < 650) ? 1 : 0; *plldiv = ((*corediv + 1) * cpu_mhz) / (sc->refosc_mhz / 2); } static inline uint32_t cpufreq_actual_mhz(struct imx6_anatop_softc *sc, uint32_t cpu_mhz) { uint32_t corediv, plldiv; cpufreq_mhz_to_div(sc, cpu_mhz, &corediv, &plldiv); return (cpufreq_mhz_from_div(sc, corediv, plldiv)); } static struct oppt * cpufreq_nearest_oppt(struct imx6_anatop_softc *sc, uint32_t cpu_newmhz) { int d, diff, i, nearest; if (cpu_newmhz > sc->cpu_maxmhz_hw && !sc->cpu_overclock_enable) cpu_newmhz = sc->cpu_maxmhz_hw; diff = INT_MAX; nearest = 0; for (i = 0; i < nitems(imx6_oppt_table); ++i) { d = abs((int)cpu_newmhz - (int)imx6_oppt_table[i].mhz); if (diff > d) { diff = d; nearest = i; } } return (&imx6_oppt_table[nearest]); } static void cpufreq_set_clock(struct imx6_anatop_softc * sc, struct oppt *op) { uint32_t corediv, plldiv, timeout, wrk32; /* If increasing the frequency, we must first increase the voltage. */ if (op->mhz > sc->cpu_curmhz) { vdd_set(sc, op->mv); } /* * I can't find a documented procedure for changing the ARM PLL divisor, * but some trial and error came up with this: * - Set the bypass clock source to REF_CLK_24M (source #0). * - Set the PLL into bypass mode; cpu should now be running at 24mhz. * - Change the divisor. * - Wait for the LOCK bit to come on; it takes ~50 loop iterations. * - Turn off bypass mode; cpu should now be running at the new speed. */ cpufreq_mhz_to_div(sc, op->mhz, &corediv, &plldiv); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_CLR, IMX6_ANALOG_CCM_PLL_ARM_CLK_SRC_MASK); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_SET, IMX6_ANALOG_CCM_PLL_ARM_BYPASS); wrk32 = imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM); wrk32 &= ~IMX6_ANALOG_CCM_PLL_ARM_DIV_MASK; wrk32 |= plldiv; imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM, wrk32); timeout = 10000; while ((imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM) & IMX6_ANALOG_CCM_PLL_ARM_LOCK) == 0) if (--timeout == 0) panic("imx6_set_cpu_clock(): PLL never locked"); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_CLR, IMX6_ANALOG_CCM_PLL_ARM_BYPASS); imx_ccm_set_cacrr(corediv); /* If lowering the frequency, it is now safe to lower the voltage. */ if (op->mhz < sc->cpu_curmhz) vdd_set(sc, op->mv); sc->cpu_curmhz = op->mhz; /* Tell the mpcore timer that its frequency has changed. */ arm_tmr_change_frequency( cpufreq_actual_mhz(sc, sc->cpu_curmhz) * 1000000 / 2); } static int cpufreq_sysctl_minmhz(SYSCTL_HANDLER_ARGS) { struct imx6_anatop_softc *sc; struct oppt * op; uint32_t temp; int err; sc = arg1; temp = sc->cpu_minmhz; err = sysctl_handle_int(oidp, &temp, 0, req); if (err != 0 || req->newptr == NULL) return (err); op = cpufreq_nearest_oppt(sc, temp); if (op->mhz > sc->cpu_maxmhz) return (ERANGE); else if (op->mhz == sc->cpu_minmhz) return (0); /* * Value changed, update softc. If the new min is higher than the * current speed, raise the current speed to match. */ sc->cpu_minmhz = op->mhz; if (sc->cpu_minmhz > sc->cpu_curmhz) { cpufreq_set_clock(sc, op); } return (err); } static int cpufreq_sysctl_maxmhz(SYSCTL_HANDLER_ARGS) { struct imx6_anatop_softc *sc; struct oppt * op; uint32_t temp; int err; sc = arg1; temp = sc->cpu_maxmhz; err = sysctl_handle_int(oidp, &temp, 0, req); if (err != 0 || req->newptr == NULL) return (err); op = cpufreq_nearest_oppt(sc, temp); if (op->mhz < sc->cpu_minmhz) return (ERANGE); else if (op->mhz == sc->cpu_maxmhz) return (0); /* * Value changed, update softc and hardware. The hardware update is * unconditional. We always try to run at max speed, so any change of * the max means we need to change the current speed too, regardless of * whether it is higher or lower than the old max. */ sc->cpu_maxmhz = op->mhz; cpufreq_set_clock(sc, op); return (err); } static void cpufreq_initialize(struct imx6_anatop_softc *sc) { uint32_t cfg3speed; struct oppt * op; SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "cpu_mhz", CTLFLAG_RD, &sc->cpu_curmhz, 0, "CPU frequency"); SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "cpu_minmhz", CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH, sc, 0, cpufreq_sysctl_minmhz, "IU", "Minimum CPU frequency"); SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "cpu_maxmhz", CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH, sc, 0, cpufreq_sysctl_maxmhz, "IU", "Maximum CPU frequency"); SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "cpu_maxmhz_hw", CTLFLAG_RD, &sc->cpu_maxmhz_hw, 0, "Maximum CPU frequency allowed by hardware"); SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "cpu_overclock_enable", CTLFLAG_RWTUN, &sc->cpu_overclock_enable, 0, "Allow setting CPU frequency higher than cpu_maxmhz_hw"); /* * XXX 24mhz shouldn't be hard-coded, should get this from imx6_ccm * (even though in the real world it will always be 24mhz). Oh wait a * sec, I never wrote imx6_ccm. */ sc->refosc_mhz = 24; /* * Get the maximum speed this cpu can be set to. The values in the * OCOTP CFG3 register are not documented in the reference manual. * The following info was in an archived email found via web search: * - 2b'11: 1200000000Hz; * - 2b'10: 996000000Hz; * - 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. * - 2b'00: 792000000Hz; * The default hardware max speed can be overridden by a tunable. */ cfg3speed = (fsl_ocotp_read_4(FSL_OCOTP_CFG3) & FSL_OCOTP_CFG3_SPEED_MASK) >> FSL_OCOTP_CFG3_SPEED_SHIFT; sc->cpu_maxmhz_hw = imx6_ocotp_mhz_tab[cfg3speed]; sc->cpu_maxmhz = sc->cpu_maxmhz_hw; TUNABLE_INT_FETCH("hw.imx6.cpu_minmhz", &sc->cpu_minmhz); op = cpufreq_nearest_oppt(sc, sc->cpu_minmhz); sc->cpu_minmhz = op->mhz; sc->cpu_minmv = op->mv; TUNABLE_INT_FETCH("hw.imx6.cpu_maxmhz", &sc->cpu_maxmhz); op = cpufreq_nearest_oppt(sc, sc->cpu_maxmhz); sc->cpu_maxmhz = op->mhz; sc->cpu_maxmv = op->mv; /* * Set the CPU to maximum speed. * * We won't have thermal throttling until interrupts are enabled, but we * want to run at full speed through all the device init stuff. This * basically assumes that a single core can't overheat before interrupts * are enabled; empirical testing shows that to be a safe assumption. */ cpufreq_set_clock(sc, op); } static inline uint32_t temp_from_count(struct imx6_anatop_softc *sc, uint32_t count) { return (((sc->temp_high_val - (count - sc->temp_high_cnt) * (sc->temp_high_val - 250) / (sc->temp_room_cnt - sc->temp_high_cnt)))); } static inline uint32_t temp_to_count(struct imx6_anatop_softc *sc, uint32_t temp) { return ((sc->temp_room_cnt - sc->temp_high_cnt) * (sc->temp_high_val - temp) / (sc->temp_high_val - 250) + sc->temp_high_cnt); } static void temp_update_count(struct imx6_anatop_softc *sc) { uint32_t val; val = imx6_anatop_read_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0); if (!(val & IMX6_ANALOG_TEMPMON_TEMPSENSE0_VALID)) return; sc->temp_last_cnt = (val & IMX6_ANALOG_TEMPMON_TEMPSENSE0_TEMP_CNT_MASK) >> IMX6_ANALOG_TEMPMON_TEMPSENSE0_TEMP_CNT_SHIFT; } static int temp_sysctl_handler(SYSCTL_HANDLER_ARGS) { struct imx6_anatop_softc *sc = arg1; uint32_t t; temp_update_count(sc); t = temp_from_count(sc, sc->temp_last_cnt) + TZ_ZEROC; return (sysctl_handle_int(oidp, &t, 0, req)); } static int temp_throttle_sysctl_handler(SYSCTL_HANDLER_ARGS) { struct imx6_anatop_softc *sc = arg1; int err; uint32_t temp; temp = sc->temp_throttle_val + TZ_ZEROC; err = sysctl_handle_int(oidp, &temp, 0, req); if (temp < TZ_ZEROC) return (ERANGE); temp -= TZ_ZEROC; if (err != 0 || req->newptr == NULL || temp == sc->temp_throttle_val) return (err); /* Value changed, update counts in softc and hardware. */ sc->temp_throttle_val = temp; sc->temp_throttle_trigger_cnt = temp_to_count(sc, sc->temp_throttle_val); sc->temp_throttle_reset_cnt = temp_to_count(sc, sc->temp_throttle_val - 100); imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0_CLR, IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_MASK); imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0_SET, (sc->temp_throttle_trigger_cnt << IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_SHIFT)); return (err); } static void tempmon_gofast(struct imx6_anatop_softc *sc) { if (sc->cpu_curmhz < sc->cpu_maxmhz) { cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_maxmhz)); } } static void tempmon_goslow(struct imx6_anatop_softc *sc) { if (sc->cpu_curmhz > sc->cpu_minmhz) { cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_minmhz)); } } static int tempmon_intr(void *arg) { struct imx6_anatop_softc *sc = arg; /* * XXX Note that this code doesn't currently run (for some mysterious * reason we just never get an interrupt), so the real monitoring is * done by tempmon_throttle_check(). */ tempmon_goslow(sc); /* XXX Schedule callout to speed back up eventually. */ return (FILTER_HANDLED); } static void tempmon_throttle_check(void *arg) { struct imx6_anatop_softc *sc = arg; /* Lower counts are higher temperatures. */ if (sc->temp_last_cnt < sc->temp_throttle_trigger_cnt) tempmon_goslow(sc); else if (sc->temp_last_cnt > (sc->temp_throttle_reset_cnt)) tempmon_gofast(sc); callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay, 0, tempmon_throttle_check, sc, 0); } static void initialize_tempmon(struct imx6_anatop_softc *sc) { uint32_t cal; /* * Fetch calibration data: a sensor count at room temperature (25C), * a sensor count at a high temperature, and that temperature */ cal = fsl_ocotp_read_4(FSL_OCOTP_ANA1); sc->temp_room_cnt = (cal & 0xFFF00000) >> 20; sc->temp_high_cnt = (cal & 0x000FFF00) >> 8; sc->temp_high_val = (cal & 0x000000FF) * 10; /* * Throttle to a lower cpu freq at 10C below the "hot" temperature, and * reset back to max cpu freq at 5C below the trigger. */ sc->temp_throttle_val = sc->temp_high_val - 100; sc->temp_throttle_trigger_cnt = temp_to_count(sc, sc->temp_throttle_val); sc->temp_throttle_reset_cnt = temp_to_count(sc, sc->temp_throttle_val - 50); /* * Set the sensor to sample automatically at 16Hz (32.768KHz/0x800), set * the throttle count, and begin making measurements. */ imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE1, 0x0800); imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0, (sc->temp_throttle_trigger_cnt << IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_SHIFT) | IMX6_ANALOG_TEMPMON_TEMPSENSE0_MEASURE); /* * XXX Note that the alarm-interrupt feature isn't working yet, so * we'll use a callout handler to check at 10Hz. Make sure we have an * initial temperature reading before starting up the callouts so we * don't get a bogus reading of zero. */ while (sc->temp_last_cnt == 0) temp_update_count(sc); sc->temp_throttle_delay = 100 * SBT_1MS; callout_init(&sc->temp_throttle_callout, 0); callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay, 0, tempmon_throttle_check, sc, 0); SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD, sc, 0, temp_sysctl_handler, "IK", "Current die temperature"); SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx), OID_AUTO, "throttle_temperature", CTLTYPE_INT | CTLFLAG_RW, sc, 0, temp_throttle_sysctl_handler, "IK", "Throttle CPU when exceeding this temperature"); } static void intr_setup(void *arg) { struct imx6_anatop_softc *sc; sc = arg; bus_setup_intr(sc->dev, sc->res[IRQRES], INTR_TYPE_MISC | INTR_MPSAFE, tempmon_intr, NULL, sc, &sc->temp_intrhand); config_intrhook_disestablish(&sc->intr_setup_hook); } static void imx6_anatop_new_pass(device_t dev) { struct imx6_anatop_softc *sc; const int cpu_init_pass = BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE; /* * We attach during BUS_PASS_BUS (because some day we will be a * simplebus that has regulator devices as children), but some of our * init work cannot be done until BUS_PASS_CPU (we rely on other devices * that attach on the CPU pass). */ sc = device_get_softc(dev); if (!sc->cpu_init_done && bus_current_pass >= cpu_init_pass) { sc->cpu_init_done = true; cpufreq_initialize(sc); initialize_tempmon(sc); if (bootverbose) { device_printf(sc->dev, "CPU %uMHz @ %umV\n", sc->cpu_curmhz, sc->cpu_curmv); } } bus_generic_new_pass(dev); } static int imx6_anatop_detach(device_t dev) { /* This device can never detach. */ return (EBUSY); } static int imx6_anatop_attach(device_t dev) { struct imx6_anatop_softc *sc; int err; sc = device_get_softc(dev); sc->dev = dev; /* Allocate bus_space resources. */ if (bus_alloc_resources(dev, imx6_anatop_spec, sc->res)) { device_printf(dev, "Cannot allocate resources\n"); err = ENXIO; goto out; } sc->intr_setup_hook.ich_func = intr_setup; sc->intr_setup_hook.ich_arg = sc; config_intrhook_establish(&sc->intr_setup_hook); SYSCTL_ADD_UINT(device_get_sysctl_ctx(sc->dev), SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), OID_AUTO, "cpu_voltage", CTLFLAG_RD, &sc->cpu_curmv, 0, "Current CPU voltage in millivolts"); imx6_anatop_sc = sc; /* * Other code seen on the net sets this SELFBIASOFF flag around the same * time the temperature sensor is set up, although it's unclear how the * two are related (if at all). */ imx6_anatop_write_4(IMX6_ANALOG_PMU_MISC0_SET, IMX6_ANALOG_PMU_MISC0_SELFBIASOFF); /* * Some day, when we're ready to deal with the actual anatop regulators * that are described in fdt data as children of this "bus", this would * be the place to invoke a simplebus helper routine to instantiate the * children from the fdt data. */ err = 0; out: if (err != 0) { bus_release_resources(dev, imx6_anatop_spec, sc->res); } return (err); } uint32_t pll4_configure_output(uint32_t mfi, uint32_t mfn, uint32_t mfd) { int reg; /* * Audio PLL (PLL4). * PLL output frequency = Fref * (DIV_SELECT + NUM/DENOM) */ reg = (IMX6_ANALOG_CCM_PLL_AUDIO_ENABLE); reg &= ~(IMX6_ANALOG_CCM_PLL_AUDIO_DIV_SELECT_MASK << \ IMX6_ANALOG_CCM_PLL_AUDIO_DIV_SELECT_SHIFT); reg |= (mfi << IMX6_ANALOG_CCM_PLL_AUDIO_DIV_SELECT_SHIFT); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_AUDIO, reg); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_AUDIO_NUM, mfn); imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_AUDIO_DENOM, mfd); return (0); } static int imx6_anatop_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_is_compatible(dev, "fsl,imx6q-anatop") == 0) return (ENXIO); device_set_desc(dev, "Freescale i.MX6 Analog PLLs and Power"); return (BUS_PROBE_DEFAULT); } uint32_t imx6_get_cpu_clock() { uint32_t corediv, plldiv; corediv = imx_ccm_get_cacrr(); plldiv = imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM) & IMX6_ANALOG_CCM_PLL_ARM_DIV_MASK; return (cpufreq_mhz_from_div(imx6_anatop_sc, corediv, plldiv)); } static device_method_t imx6_anatop_methods[] = { /* Device interface */ DEVMETHOD(device_probe, imx6_anatop_probe), DEVMETHOD(device_attach, imx6_anatop_attach), DEVMETHOD(device_detach, imx6_anatop_detach), /* Bus interface */ DEVMETHOD(bus_new_pass, imx6_anatop_new_pass), DEVMETHOD_END }; static driver_t imx6_anatop_driver = { "imx6_anatop", imx6_anatop_methods, sizeof(struct imx6_anatop_softc) }; static devclass_t imx6_anatop_devclass; EARLY_DRIVER_MODULE(imx6_anatop, simplebus, imx6_anatop_driver, imx6_anatop_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); EARLY_DRIVER_MODULE(imx6_anatop, ofwbus, imx6_anatop_driver, imx6_anatop_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);