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sys/dev/cpufreq/cpufreq_dt.c
- This file was added.
| /*- | |||||
| * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> | |||||
| * 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 ``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 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. | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| /* | |||||
| * Generic DT based cpufreq driver | |||||
| */ | |||||
| #include <sys/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include <sys/param.h> | |||||
| #include <sys/systm.h> | |||||
| #include <sys/bus.h> | |||||
| #include <sys/rman.h> | |||||
| #include <sys/kernel.h> | |||||
| #include <sys/module.h> | |||||
| #include <sys/cpu.h> | |||||
| #include <dev/ofw/ofw_bus.h> | |||||
| #include <dev/ofw/ofw_bus_subr.h> | |||||
| #include <dev/extres/clk/clk.h> | |||||
| #include <dev/extres/regulator/regulator.h> | |||||
| #include "cpufreq_if.h" | |||||
| struct cpufreq_dt_opp { | |||||
| uint32_t freq_khz; | |||||
| uint32_t voltage_uv; | |||||
| }; | |||||
| struct cpufreq_dt_softc { | |||||
| clk_t clk; | |||||
| regulator_t reg; | |||||
| struct cpufreq_dt_opp *opp; | |||||
| ssize_t nopp; | |||||
| int clk_latency; | |||||
| }; | |||||
| static void | |||||
| cpufreq_dt_identify(driver_t *driver, device_t parent) | |||||
| { | |||||
| phandle_t node; | |||||
| node = ofw_bus_get_node(parent); | |||||
| if (!OF_hasprop(node, "operating-points") || | |||||
| !OF_hasprop(node, "clocks") || | |||||
| !OF_hasprop(node, "cpu-supply")) | |||||
| return; | |||||
| if (device_find_child(parent, "cpufreq_dt", -1) != NULL) | |||||
| return; | |||||
| if (BUS_ADD_CHILD(parent, 0, "cpufreq_dt", -1) == NULL) | |||||
| device_printf(parent, "add cpufreq_dt child failed\n"); | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_probe(device_t dev) | |||||
| { | |||||
| phandle_t node; | |||||
| node = ofw_bus_get_node(device_get_parent(dev)); | |||||
| if (!OF_hasprop(node, "operating-points") || | |||||
| !OF_hasprop(node, "clocks") || | |||||
| !OF_hasprop(node, "cpu-supply")) | |||||
| return (ENXIO); | |||||
| device_set_desc(dev, "Generic cpufreq driver"); | |||||
| return (BUS_PROBE_GENERIC); | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_attach(device_t dev) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| uint32_t *opp, lat; | |||||
| phandle_t node; | |||||
| ssize_t n; | |||||
| sc = device_get_softc(dev); | |||||
| node = ofw_bus_get_node(device_get_parent(dev)); | |||||
| if (regulator_get_by_ofw_property(dev, node, | |||||
| "cpu-supply", &sc->reg) != 0) { | |||||
| device_printf(dev, "no regulator for %s\n", | |||||
| ofw_bus_get_name(device_get_parent(dev))); | |||||
| return (ENXIO); | |||||
| } | |||||
| if (clk_get_by_ofw_index(dev, node, 0, &sc->clk) != 0) { | |||||
| device_printf(dev, "no clock for %s\n", | |||||
| ofw_bus_get_name(device_get_parent(dev))); | |||||
| regulator_release(sc->reg); | |||||
| return (ENXIO); | |||||
| } | |||||
| sc->nopp = OF_getencprop_alloc(node, "operating-points", | |||||
| sizeof(*sc->opp), (void **)&opp); | |||||
| if (sc->nopp == -1) | |||||
| return (ENXIO); | |||||
| sc->opp = malloc(sizeof(*sc->opp) * sc->nopp, M_DEVBUF, M_WAITOK); | |||||
| for (n = 0; n < sc->nopp; n++) { | |||||
| sc->opp[n].freq_khz = opp[n * 2 + 0]; | |||||
| sc->opp[n].voltage_uv = opp[n * 2 + 1]; | |||||
| if (bootverbose) | |||||
| device_printf(dev, "%u.%03u MHz, %u uV\n", | |||||
| sc->opp[n].freq_khz / 1000, | |||||
| sc->opp[n].freq_khz % 1000, | |||||
| sc->opp[n].voltage_uv); | |||||
| } | |||||
| free(opp, M_OFWPROP); | |||||
| if (OF_getencprop(node, "clock-latency", &lat, sizeof(lat)) == -1) | |||||
| sc->clk_latency = CPUFREQ_VAL_UNKNOWN; | |||||
| else | |||||
| sc->clk_latency = (int)lat; | |||||
| cpufreq_register(dev); | |||||
| return (0); | |||||
| } | |||||
| static const struct cpufreq_dt_opp * | |||||
| cpufreq_dt_find_opp(device_t dev, uint32_t freq_mhz) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| ssize_t n; | |||||
| sc = device_get_softc(dev); | |||||
| for (n = 0; n < sc->nopp; n++) | |||||
| if (CPUFREQ_CMP(sc->opp[n].freq_khz / 1000, freq_mhz)) | |||||
| return (&sc->opp[n]); | |||||
| return (NULL); | |||||
| } | |||||
| static void | |||||
| cpufreq_dt_opp_to_setting(device_t dev, const struct cpufreq_dt_opp *opp, | |||||
| struct cf_setting *set) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| memset(set, 0, sizeof(*set)); | |||||
| set->freq = opp->freq_khz / 1000; | |||||
| set->volts = opp->voltage_uv / 1000; | |||||
| set->power = CPUFREQ_VAL_UNKNOWN; | |||||
| set->lat = sc->clk_latency; | |||||
| set->dev = dev; | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_get(device_t dev, struct cf_setting *set) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| const struct cpufreq_dt_opp *opp; | |||||
| uint64_t freq; | |||||
| sc = device_get_softc(dev); | |||||
| if (clk_get_freq(sc->clk, &freq) != 0) | |||||
| return (ENXIO); | |||||
| opp = cpufreq_dt_find_opp(dev, freq / 1000000); | |||||
| if (opp == NULL) | |||||
| return (ENOENT); | |||||
| cpufreq_dt_opp_to_setting(dev, opp, set); | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_set(device_t dev, const struct cf_setting *set) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| const struct cpufreq_dt_opp *opp, *copp; | |||||
| uint64_t freq; | |||||
| int error; | |||||
| sc = device_get_softc(dev); | |||||
| if (clk_get_freq(sc->clk, &freq) != 0) | |||||
| return (ENXIO); | |||||
| copp = cpufreq_dt_find_opp(dev, freq / 1000000); | |||||
| if (copp == NULL) | |||||
| return (ENOENT); | |||||
| opp = cpufreq_dt_find_opp(dev, set->freq); | |||||
| if (opp == NULL) | |||||
| return (EINVAL); | |||||
| if (copp->voltage_uv < opp->voltage_uv) { | |||||
| error = regulator_set_voltage(sc->reg, opp->voltage_uv, | |||||
| opp->voltage_uv); | |||||
| if (error != 0) | |||||
| return (ENXIO); | |||||
| } | |||||
| error = clk_set_freq(sc->clk, (uint64_t)opp->freq_khz * 1000, 0); | |||||
| if (error != 0) | |||||
| return (ENXIO); | |||||
manu: Shouldn't we set back the regulator voltage to it's original value if we couldn't change the… | |||||
| if (copp->voltage_uv > opp->voltage_uv) { | |||||
| error = regulator_set_voltage(sc->reg, opp->voltage_uv, | |||||
| opp->voltage_uv); | |||||
| if (error != 0) | |||||
| return (ENXIO); | |||||
manuUnsubmitted Done Inline ActionsSame question here for the freq manu: Same question here for the freq | |||||
| } | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_type(device_t dev, int *type) | |||||
| { | |||||
| if (type == NULL) | |||||
| return (EINVAL); | |||||
| *type = CPUFREQ_TYPE_ABSOLUTE; | |||||
| return (0); | |||||
| } | |||||
| static int | |||||
| cpufreq_dt_settings(device_t dev, struct cf_setting *sets, int *count) | |||||
| { | |||||
| struct cpufreq_dt_softc *sc; | |||||
| ssize_t n; | |||||
| if (sets == NULL || count == NULL) | |||||
| return (EINVAL); | |||||
| sc = device_get_softc(dev); | |||||
| if (*count < sc->nopp) { | |||||
| *count = (int)sc->nopp; | |||||
| return (E2BIG); | |||||
| } | |||||
| for (n = 0; n < sc->nopp; n++) | |||||
| cpufreq_dt_opp_to_setting(dev, &sc->opp[n], &sets[n]); | |||||
| *count = (int)sc->nopp; | |||||
| return (0); | |||||
| } | |||||
| static device_method_t cpufreq_dt_methods[] = { | |||||
| /* Device interface */ | |||||
| DEVMETHOD(device_identify, cpufreq_dt_identify), | |||||
| DEVMETHOD(device_probe, cpufreq_dt_probe), | |||||
| DEVMETHOD(device_attach, cpufreq_dt_attach), | |||||
| /* cpufreq interface */ | |||||
| DEVMETHOD(cpufreq_drv_get, cpufreq_dt_get), | |||||
| DEVMETHOD(cpufreq_drv_set, cpufreq_dt_set), | |||||
| DEVMETHOD(cpufreq_drv_type, cpufreq_dt_type), | |||||
| DEVMETHOD(cpufreq_drv_settings, cpufreq_dt_settings), | |||||
| DEVMETHOD_END | |||||
| }; | |||||
| static driver_t cpufreq_dt_driver = { | |||||
| "cpufreq_dt", | |||||
| cpufreq_dt_methods, | |||||
| sizeof(struct cpufreq_dt_softc), | |||||
| }; | |||||
| static devclass_t cpufreq_dt_devclass; | |||||
| DRIVER_MODULE(cpufreq_dt, cpu, cpufreq_dt_driver, cpufreq_dt_devclass, 0, 0); | |||||
| MODULE_VERSION(cpufreq_dt, 1); | |||||
Shouldn't we set back the regulator voltage to it's original value if we couldn't change the freq ?