/*- * Copyright (C) 2013-2015 Daisuke Aoyama * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cpufreq_if.h" #ifdef DEBUG #define DPRINTF(fmt, ...) do { \ printf("%s:%u: ", __func__, __LINE__); \ printf(fmt, ##__VA_ARGS__); \ } while (0) #else #define DPRINTF(fmt, ...) #endif #define HZ2MHZ(freq) ((freq) / (1000 * 1000)) #define MHZ2HZ(freq) ((freq) * (1000 * 1000)) #ifdef SOC_BCM2835 #define OFFSET2MVOLT(val) (1200 + ((val) * 25)) #define MVOLT2OFFSET(val) (((val) - 1200) / 25) #define DEFAULT_ARM_FREQUENCY 700 #define DEFAULT_LOWEST_FREQ 300 #else #define OFFSET2MVOLT(val) (((val) / 1000)) #define MVOLT2OFFSET(val) (((val) * 1000)) #define DEFAULT_ARM_FREQUENCY 600 #define DEFAULT_LOWEST_FREQ 600 #endif #define DEFAULT_CORE_FREQUENCY 250 #define DEFAULT_SDRAM_FREQUENCY 400 #define TRANSITION_LATENCY 1000 #define MIN_OVER_VOLTAGE -16 #define MAX_OVER_VOLTAGE 6 #define MSG_ERROR -999999999 #define MHZSTEP 100 #define HZSTEP (MHZ2HZ(MHZSTEP)) #define TZ_ZEROC 2731 #define VC_LOCK(sc) do { \ sema_wait(&vc_sema); \ } while (0) #define VC_UNLOCK(sc) do { \ sema_post(&vc_sema); \ } while (0) /* ARM->VC mailbox property semaphore */ static struct sema vc_sema; static struct sysctl_ctx_list bcm2835_sysctl_ctx; struct bcm2835_cpufreq_softc { device_t dev; device_t firmware; int arm_max_freq; int arm_min_freq; int core_max_freq; int core_min_freq; int sdram_max_freq; int sdram_min_freq; int max_voltage_core; int min_voltage_core; /* the values written in mbox */ int voltage_core; int voltage_sdram; int voltage_sdram_c; int voltage_sdram_i; int voltage_sdram_p; int turbo_mode; /* initial hook for waiting mbox intr */ struct intr_config_hook init_hook; }; static struct ofw_compat_data compat_data[] = { { "broadcom,bcm2835-vc", 1 }, { "broadcom,bcm2708-vc", 1 }, { "brcm,bcm2709", 1 }, { "brcm,bcm2835", 1 }, { "brcm,bcm2836", 1 }, { "brcm,bcm2837", 1 }, { "brcm,bcm2711", 1 }, { NULL, 0 } }; static int cpufreq_verbose = 0; TUNABLE_INT("hw.bcm2835.cpufreq.verbose", &cpufreq_verbose); static int cpufreq_lowest_freq = DEFAULT_LOWEST_FREQ; TUNABLE_INT("hw.bcm2835.cpufreq.lowest_freq", &cpufreq_lowest_freq); #ifdef PROP_DEBUG static void bcm2835_dump(const void *data, int len) { const uint8_t *p = (const uint8_t*)data; int i; printf("dump @ %p:\n", data); for (i = 0; i < len; i++) { printf("%2.2x ", p[i]); if ((i % 4) == 3) printf(" "); if ((i % 16) == 15) printf("\n"); } printf("\n"); } #endif static int bcm2835_cpufreq_get_clock_rate(struct bcm2835_cpufreq_softc *sc, uint32_t clock_id) { union msg_get_clock_rate_body msg; int rate; int err; /* * Get clock rate * Tag: 0x00030002 * Request: * Length: 4 * Value: * u32: clock id * Response: * Length: 8 * Value: * u32: clock id * u32: rate (in Hz) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.clock_id = clock_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_CLOCK_RATE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get clock rate (id=%u)\n", clock_id); return (MSG_ERROR); } /* result (Hz) */ rate = (int)msg.resp.rate_hz; DPRINTF("clock = %d(Hz)\n", rate); return (rate); } static int bcm2835_cpufreq_get_max_clock_rate(struct bcm2835_cpufreq_softc *sc, uint32_t clock_id) { union msg_get_clock_rate_body msg; int rate; int err; /* * Get max clock rate * Tag: 0x00030004 * Request: * Length: 4 * Value: * u32: clock id * Response: * Length: 8 * Value: * u32: clock id * u32: rate (in Hz) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.clock_id = clock_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_MAX_CLOCK_RATE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get max clock rate (id=%u)\n", clock_id); return (MSG_ERROR); } /* result (Hz) */ rate = (int)msg.resp.rate_hz; DPRINTF("clock = %d(Hz)\n", rate); return (rate); } static int bcm2835_cpufreq_get_min_clock_rate(struct bcm2835_cpufreq_softc *sc, uint32_t clock_id) { union msg_get_clock_rate_body msg; int rate; int err; /* * Get min clock rate * Tag: 0x00030007 * Request: * Length: 4 * Value: * u32: clock id * Response: * Length: 8 * Value: * u32: clock id * u32: rate (in Hz) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.clock_id = clock_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_MIN_CLOCK_RATE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get min clock rate (id=%u)\n", clock_id); return (MSG_ERROR); } /* result (Hz) */ rate = (int)msg.resp.rate_hz; DPRINTF("clock = %d(Hz)\n", rate); return (rate); } static int bcm2835_cpufreq_set_clock_rate(struct bcm2835_cpufreq_softc *sc, uint32_t clock_id, uint32_t rate_hz) { union msg_set_clock_rate_body msg; int rate; int err; /* * Set clock rate * Tag: 0x00038002 * Request: * Length: 8 * Value: * u32: clock id * u32: rate (in Hz) * Response: * Length: 8 * Value: * u32: clock id * u32: rate (in Hz) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.clock_id = clock_id; msg.req.rate_hz = rate_hz; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_SET_CLOCK_RATE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't set clock rate (id=%u)\n", clock_id); return (MSG_ERROR); } /* workaround for core clock */ if (clock_id == BCM2835_FIRMWARE_CLOCK_ID_CORE) { /* for safety (may change voltage without changing clock) */ DELAY(TRANSITION_LATENCY); /* * XXX: the core clock is unable to change at once, * to change certainly, write it twice now. */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.clock_id = clock_id; msg.req.rate_hz = rate_hz; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_SET_CLOCK_RATE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't set clock rate (id=%u)\n", clock_id); return (MSG_ERROR); } } /* result (Hz) */ rate = (int)msg.resp.rate_hz; DPRINTF("clock = %d(Hz)\n", rate); return (rate); } static int bcm2835_cpufreq_get_turbo(struct bcm2835_cpufreq_softc *sc) { union msg_get_turbo_body msg; int level; int err; /* * Get turbo * Tag: 0x00030009 * Request: * Length: 4 * Value: * u32: id * Response: * Length: 8 * Value: * u32: id * u32: level */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.id = 0; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_TURBO, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get turbo\n"); return (MSG_ERROR); } /* result 0=non-turbo, 1=turbo */ level = (int)msg.resp.level; DPRINTF("level = %d\n", level); return (level); } static int bcm2835_cpufreq_set_turbo(struct bcm2835_cpufreq_softc *sc, uint32_t level) { union msg_set_turbo_body msg; int value; int err; /* * Set turbo * Tag: 0x00038009 * Request: * Length: 8 * Value: * u32: id * u32: level * Response: * Length: 8 * Value: * u32: id * u32: level */ /* replace unknown value to OFF */ if (level != BCM2835_FIRMWARE_TURBO_ON && level != BCM2835_FIRMWARE_TURBO_OFF) level = BCM2835_FIRMWARE_TURBO_OFF; /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.id = 0; msg.req.level = level; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_SET_TURBO, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't set turbo\n"); return (MSG_ERROR); } /* result 0=non-turbo, 1=turbo */ value = (int)msg.resp.level; DPRINTF("level = %d\n", value); return (value); } static int bcm2835_cpufreq_get_voltage(struct bcm2835_cpufreq_softc *sc, uint32_t voltage_id) { union msg_get_voltage_body msg; int value; int err; /* * Get voltage * Tag: 0x00030003 * Request: * Length: 4 * Value: * u32: voltage id * Response: * Length: 8 * Value: * u32: voltage id * u32: value (offset from 1.2V in units of 0.025V) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.voltage_id = voltage_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_VOLTAGE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get voltage\n"); return (MSG_ERROR); } /* result (offset from 1.2V) */ value = (int)msg.resp.value; DPRINTF("value = %d\n", value); return (value); } static int bcm2835_cpufreq_get_max_voltage(struct bcm2835_cpufreq_softc *sc, uint32_t voltage_id) { union msg_get_voltage_body msg; int value; int err; /* * Get voltage * Tag: 0x00030005 * Request: * Length: 4 * Value: * u32: voltage id * Response: * Length: 8 * Value: * u32: voltage id * u32: value (offset from 1.2V in units of 0.025V) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.voltage_id = voltage_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_MAX_VOLTAGE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get max voltage\n"); return (MSG_ERROR); } /* result (offset from 1.2V) */ value = (int)msg.resp.value; DPRINTF("value = %d\n", value); return (value); } static int bcm2835_cpufreq_get_min_voltage(struct bcm2835_cpufreq_softc *sc, uint32_t voltage_id) { union msg_get_voltage_body msg; int value; int err; /* * Get voltage * Tag: 0x00030008 * Request: * Length: 4 * Value: * u32: voltage id * Response: * Length: 8 * Value: * u32: voltage id * u32: value (offset from 1.2V in units of 0.025V) */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.voltage_id = voltage_id; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_MIN_VOLTAGE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get min voltage\n"); return (MSG_ERROR); } /* result (offset from 1.2V) */ value = (int)msg.resp.value; DPRINTF("value = %d\n", value); return (value); } static int bcm2835_cpufreq_set_voltage(struct bcm2835_cpufreq_softc *sc, uint32_t voltage_id, int32_t value) { union msg_set_voltage_body msg; int err; /* * Set voltage * Tag: 0x00038003 * Request: * Length: 4 * Value: * u32: voltage id * u32: value (offset from 1.2V in units of 0.025V) * Response: * Length: 8 * Value: * u32: voltage id * u32: value (offset from 1.2V in units of 0.025V) */ /* * over_voltage: * 0 (1.2 V). Values above 6 are only allowed when force_turbo or * current_limit_override are specified (which set the warranty bit). */ if (value > MAX_OVER_VOLTAGE || value < MIN_OVER_VOLTAGE) { /* currently not supported */ device_printf(sc->dev, "not supported voltage: %d\n", value); return (MSG_ERROR); } /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.voltage_id = voltage_id; msg.req.value = (uint32_t)value; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_SET_VOLTAGE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't set voltage\n"); return (MSG_ERROR); } /* result (offset from 1.2V) */ value = (int)msg.resp.value; DPRINTF("value = %d\n", value); return (value); } static int bcm2835_cpufreq_get_temperature(struct bcm2835_cpufreq_softc *sc) { union msg_get_temperature_body msg; int value; int err; /* * Get temperature * Tag: 0x00030006 * Request: * Length: 4 * Value: * u32: temperature id * Response: * Length: 8 * Value: * u32: temperature id * u32: value */ /* setup single tag buffer */ memset(&msg, 0, sizeof(msg)); msg.req.temperature_id = 0; /* call mailbox property */ err = bcm2835_firmware_property(sc->firmware, BCM2835_FIRMWARE_TAG_GET_TEMPERATURE, &msg, sizeof(msg)); if (err) { device_printf(sc->dev, "can't get temperature\n"); return (MSG_ERROR); } /* result (temperature of degree C) */ value = (int)msg.resp.value; DPRINTF("value = %d\n", value); return (value); } static int sysctl_bcm2835_cpufreq_arm_freq(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ VC_LOCK(sc); err = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM, val); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set clock arm_freq error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_core_freq(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ VC_LOCK(sc); err = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, val); if (err == MSG_ERROR) { VC_UNLOCK(sc); device_printf(sc->dev, "set clock core_freq error\n"); return (EIO); } VC_UNLOCK(sc); DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_sdram_freq(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ VC_LOCK(sc); err = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM, val); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set clock sdram_freq error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_turbo(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_turbo(sc); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ if (val > 0) sc->turbo_mode = BCM2835_FIRMWARE_TURBO_ON; else sc->turbo_mode = BCM2835_FIRMWARE_TURBO_OFF; VC_LOCK(sc); err = bcm2835_cpufreq_set_turbo(sc, sc->turbo_mode); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set turbo error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_voltage_core(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) return (EINVAL); sc->voltage_core = val; VC_LOCK(sc); err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE, sc->voltage_core); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set voltage core error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_voltage_sdram_c(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) return (EINVAL); sc->voltage_sdram_c = val; VC_LOCK(sc); err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C, sc->voltage_sdram_c); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set voltage sdram_c error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_voltage_sdram_i(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) return (EINVAL); sc->voltage_sdram_i = val; VC_LOCK(sc); err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I, sc->voltage_sdram_i); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set voltage sdram_i error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_voltage_sdram_p(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) return (EINVAL); sc->voltage_sdram_p = val; VC_LOCK(sc); err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P, sc->voltage_sdram_p); VC_UNLOCK(sc); if (err == MSG_ERROR) { device_printf(sc->dev, "set voltage sdram_p error\n"); return (EIO); } DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_voltage_sdram(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* multiple write only */ if (!req->newptr) return (EINVAL); val = 0; err = sysctl_handle_int(oidp, &val, 0, req); if (err) return (err); /* write request */ if (val > MAX_OVER_VOLTAGE || val < MIN_OVER_VOLTAGE) return (EINVAL); sc->voltage_sdram = val; VC_LOCK(sc); err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C, val); if (err == MSG_ERROR) { VC_UNLOCK(sc); device_printf(sc->dev, "set voltage sdram_c error\n"); return (EIO); } err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I, val); if (err == MSG_ERROR) { VC_UNLOCK(sc); device_printf(sc->dev, "set voltage sdram_i error\n"); return (EIO); } err = bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P, val); if (err == MSG_ERROR) { VC_UNLOCK(sc); device_printf(sc->dev, "set voltage sdram_p error\n"); return (EIO); } VC_UNLOCK(sc); DELAY(TRANSITION_LATENCY); return (0); } static int sysctl_bcm2835_cpufreq_temperature(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_temperature(sc); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ return (EINVAL); } static int sysctl_bcm2835_devcpu_temperature(SYSCTL_HANDLER_ARGS) { struct bcm2835_cpufreq_softc *sc = arg1; int val; int err; /* get realtime value */ VC_LOCK(sc); val = bcm2835_cpufreq_get_temperature(sc); VC_UNLOCK(sc); if (val == MSG_ERROR) return (EIO); /* 1/1000 celsius (raw) to 1/10 kelvin */ val = val / 100 + TZ_ZEROC; err = sysctl_handle_int(oidp, &val, 0, req); if (err || !req->newptr) /* error || read request */ return (err); /* write request */ return (EINVAL); } static void bcm2835_cpufreq_init(void *arg) { struct bcm2835_cpufreq_softc *sc = arg; struct sysctl_ctx_list *ctx; device_t cpu; int arm_freq, core_freq, sdram_freq; int arm_max_freq, arm_min_freq, core_max_freq, core_min_freq; int sdram_max_freq, sdram_min_freq; int voltage_core, voltage_sdram_c, voltage_sdram_i, voltage_sdram_p; int max_voltage_core, min_voltage_core; int max_voltage_sdram_c, min_voltage_sdram_c; int max_voltage_sdram_i, min_voltage_sdram_i; int max_voltage_sdram_p, min_voltage_sdram_p; int turbo, temperature; VC_LOCK(sc); /* current clock */ arm_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); core_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE); sdram_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM); /* max/min clock */ arm_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); arm_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); core_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE); core_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE); sdram_max_freq = bcm2835_cpufreq_get_max_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM); sdram_min_freq = bcm2835_cpufreq_get_min_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM); /* turbo mode */ turbo = bcm2835_cpufreq_get_turbo(sc); if (turbo > 0) sc->turbo_mode = BCM2835_FIRMWARE_TURBO_ON; else sc->turbo_mode = BCM2835_FIRMWARE_TURBO_OFF; /* voltage */ voltage_core = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE); voltage_sdram_c = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); voltage_sdram_i = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); voltage_sdram_p = bcm2835_cpufreq_get_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); /* current values (offset from 1.2V) */ sc->voltage_core = voltage_core; sc->voltage_sdram = voltage_sdram_c; sc->voltage_sdram_c = voltage_sdram_c; sc->voltage_sdram_i = voltage_sdram_i; sc->voltage_sdram_p = voltage_sdram_p; /* max/min voltage */ max_voltage_core = bcm2835_cpufreq_get_max_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE); min_voltage_core = bcm2835_cpufreq_get_min_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE); max_voltage_sdram_c = bcm2835_cpufreq_get_max_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); max_voltage_sdram_i = bcm2835_cpufreq_get_max_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); max_voltage_sdram_p = bcm2835_cpufreq_get_max_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); min_voltage_sdram_c = bcm2835_cpufreq_get_min_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_C); min_voltage_sdram_i = bcm2835_cpufreq_get_min_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_I); min_voltage_sdram_p = bcm2835_cpufreq_get_min_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_SDRAM_P); /* temperature */ temperature = bcm2835_cpufreq_get_temperature(sc); /* show result */ if (cpufreq_verbose || bootverbose) { device_printf(sc->dev, "Boot settings:\n"); device_printf(sc->dev, "current ARM %dMHz, Core %dMHz, SDRAM %dMHz, Turbo %s\n", HZ2MHZ(arm_freq), HZ2MHZ(core_freq), HZ2MHZ(sdram_freq), (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) ? "ON":"OFF"); device_printf(sc->dev, "max/min ARM %d/%dMHz, Core %d/%dMHz, SDRAM %d/%dMHz\n", HZ2MHZ(arm_max_freq), HZ2MHZ(arm_min_freq), HZ2MHZ(core_max_freq), HZ2MHZ(core_min_freq), HZ2MHZ(sdram_max_freq), HZ2MHZ(sdram_min_freq)); device_printf(sc->dev, "current Core %dmV, SDRAM_C %dmV, SDRAM_I %dmV, " "SDRAM_P %dmV\n", OFFSET2MVOLT(voltage_core), OFFSET2MVOLT(voltage_sdram_c), OFFSET2MVOLT(voltage_sdram_i), OFFSET2MVOLT(voltage_sdram_p)); device_printf(sc->dev, "max/min Core %d/%dmV, SDRAM_C %d/%dmV, SDRAM_I %d/%dmV, " "SDRAM_P %d/%dmV\n", OFFSET2MVOLT(max_voltage_core), OFFSET2MVOLT(min_voltage_core), OFFSET2MVOLT(max_voltage_sdram_c), OFFSET2MVOLT(min_voltage_sdram_c), OFFSET2MVOLT(max_voltage_sdram_i), OFFSET2MVOLT(min_voltage_sdram_i), OFFSET2MVOLT(max_voltage_sdram_p), OFFSET2MVOLT(min_voltage_sdram_p)); device_printf(sc->dev, "Temperature %d.%dC\n", (temperature / 1000), (temperature % 1000) / 100); } else { /* !cpufreq_verbose && !bootverbose */ device_printf(sc->dev, "ARM %dMHz, Core %dMHz, SDRAM %dMHz, Turbo %s\n", HZ2MHZ(arm_freq), HZ2MHZ(core_freq), HZ2MHZ(sdram_freq), (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) ? "ON":"OFF"); } /* keep in softc (MHz/mV) */ sc->arm_max_freq = HZ2MHZ(arm_max_freq); sc->arm_min_freq = HZ2MHZ(arm_min_freq); sc->core_max_freq = HZ2MHZ(core_max_freq); sc->core_min_freq = HZ2MHZ(core_min_freq); sc->sdram_max_freq = HZ2MHZ(sdram_max_freq); sc->sdram_min_freq = HZ2MHZ(sdram_min_freq); sc->max_voltage_core = OFFSET2MVOLT(max_voltage_core); sc->min_voltage_core = OFFSET2MVOLT(min_voltage_core); /* if turbo is on, set to max values */ if (sc->turbo_mode == BCM2835_FIRMWARE_TURBO_ON) { bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM, arm_max_freq); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, core_max_freq); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM, sdram_max_freq); DELAY(TRANSITION_LATENCY); } else { bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM, arm_min_freq); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, core_min_freq); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM, sdram_min_freq); DELAY(TRANSITION_LATENCY); } VC_UNLOCK(sc); /* add human readable temperature to dev.cpu node */ cpu = device_get_parent(sc->dev); if (cpu != NULL) { ctx = device_get_sysctl_ctx(cpu); SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(cpu)), OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_devcpu_temperature, "IK", "Current SoC temperature"); } /* release this hook (continue boot) */ config_intrhook_disestablish(&sc->init_hook); } static void bcm2835_cpufreq_identify(driver_t *driver, device_t parent) { const struct ofw_compat_data *compat; phandle_t root; root = OF_finddevice("/"); for (compat = compat_data; compat->ocd_str != NULL; compat++) if (ofw_bus_node_is_compatible(root, compat->ocd_str)) break; if (compat->ocd_data == 0) return; DPRINTF("driver=%p, parent=%p\n", driver, parent); if (device_find_child(parent, "bcm2835_cpufreq", -1) != NULL) return; if (BUS_ADD_CHILD(parent, 0, "bcm2835_cpufreq", -1) == NULL) device_printf(parent, "add child failed\n"); } static int bcm2835_cpufreq_probe(device_t dev) { if (device_get_unit(dev) != 0) return (ENXIO); device_set_desc(dev, "CPU Frequency Control"); return (0); } static int bcm2835_cpufreq_attach(device_t dev) { struct bcm2835_cpufreq_softc *sc; struct sysctl_oid *oid; /* set self dev */ sc = device_get_softc(dev); sc->dev = dev; sc->firmware = devclass_get_device( devclass_find("bcm2835_firmware"), 0); if (sc->firmware == NULL) { device_printf(dev, "Unable to find firmware device\n"); return (ENXIO); } /* initial values */ sc->arm_max_freq = -1; sc->arm_min_freq = -1; sc->core_max_freq = -1; sc->core_min_freq = -1; sc->sdram_max_freq = -1; sc->sdram_min_freq = -1; sc->max_voltage_core = 0; sc->min_voltage_core = 0; /* setup sysctl at first device */ if (device_get_unit(dev) == 0) { sysctl_ctx_init(&bcm2835_sysctl_ctx); /* create node for hw.cpufreq */ oid = SYSCTL_ADD_NODE(&bcm2835_sysctl_ctx, SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO, "cpufreq", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, ""); /* Frequency (Hz) */ SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "arm_freq", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_arm_freq, "IU", "ARM frequency (Hz)"); SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "core_freq", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_core_freq, "IU", "Core frequency (Hz)"); SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "sdram_freq", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_sdram_freq, "IU", "SDRAM frequency (Hz)"); /* Turbo state */ SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "turbo", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_turbo, "IU", "Disables dynamic clocking"); /* Voltage (offset from 1.2V in units of 0.025V) */ SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "voltage_core", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_voltage_core, "I", "ARM/GPU core voltage" "(offset from 1.2V in units of 0.025V)"); SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "voltage_sdram", CTLTYPE_INT | CTLFLAG_WR | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_voltage_sdram, "I", "SDRAM voltage (offset from 1.2V in units of 0.025V)"); /* Voltage individual SDRAM */ SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "voltage_sdram_c", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_voltage_sdram_c, "I", "SDRAM controller voltage" "(offset from 1.2V in units of 0.025V)"); SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "voltage_sdram_i", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_voltage_sdram_i, "I", "SDRAM I/O voltage (offset from 1.2V in units of 0.025V)"); SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "voltage_sdram_p", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_voltage_sdram_p, "I", "SDRAM phy voltage (offset from 1.2V in units of 0.025V)"); /* Temperature */ SYSCTL_ADD_PROC(&bcm2835_sysctl_ctx, SYSCTL_CHILDREN(oid), OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0, sysctl_bcm2835_cpufreq_temperature, "I", "SoC temperature (thousandths of a degree C)"); } /* ARM->VC lock */ sema_init(&vc_sema, 1, "vcsema"); /* register callback for using mbox when interrupts are enabled */ sc->init_hook.ich_func = bcm2835_cpufreq_init; sc->init_hook.ich_arg = sc; if (config_intrhook_establish(&sc->init_hook) != 0) { device_printf(dev, "config_intrhook_establish failed\n"); return (ENOMEM); } /* this device is controlled by cpufreq(4) */ cpufreq_register(dev); return (0); } static int bcm2835_cpufreq_detach(device_t dev) { sema_destroy(&vc_sema); return (cpufreq_unregister(dev)); } static int bcm2835_cpufreq_set(device_t dev, const struct cf_setting *cf) { struct bcm2835_cpufreq_softc *sc; uint32_t rate_hz, rem; int resp_freq, arm_freq, min_freq, core_freq; #ifdef DEBUG int cur_freq; #endif if (cf == NULL || cf->freq < 0) return (EINVAL); sc = device_get_softc(dev); /* setting clock (Hz) */ rate_hz = (uint32_t)MHZ2HZ(cf->freq); rem = rate_hz % HZSTEP; rate_hz -= rem; if (rate_hz == 0) return (EINVAL); /* adjust min freq */ min_freq = sc->arm_min_freq; if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) if (min_freq > cpufreq_lowest_freq) min_freq = cpufreq_lowest_freq; if (rate_hz < MHZ2HZ(min_freq) || rate_hz > MHZ2HZ(sc->arm_max_freq)) return (EINVAL); /* set new value and verify it */ VC_LOCK(sc); #ifdef DEBUG cur_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); #endif resp_freq = bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM, rate_hz); DELAY(TRANSITION_LATENCY); arm_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); /* * if non-turbo and lower than or equal min_freq, * clock down core and sdram to default first. */ if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) { core_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE); if (rate_hz > MHZ2HZ(sc->arm_min_freq)) { bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, MHZ2HZ(sc->core_max_freq)); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM, MHZ2HZ(sc->sdram_max_freq)); DELAY(TRANSITION_LATENCY); } else { if (sc->core_min_freq < DEFAULT_CORE_FREQUENCY && core_freq > DEFAULT_CORE_FREQUENCY) { /* first, down to 250, then down to min */ DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, MHZ2HZ(DEFAULT_CORE_FREQUENCY)); DELAY(TRANSITION_LATENCY); /* reset core voltage */ bcm2835_cpufreq_set_voltage(sc, BCM2835_FIRMWARE_VOLTAGE_ID_CORE, 0); DELAY(TRANSITION_LATENCY); } bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_CORE, MHZ2HZ(sc->core_min_freq)); DELAY(TRANSITION_LATENCY); bcm2835_cpufreq_set_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_SDRAM, MHZ2HZ(sc->sdram_min_freq)); DELAY(TRANSITION_LATENCY); } } VC_UNLOCK(sc); if (resp_freq < 0 || arm_freq < 0 || resp_freq != arm_freq) { device_printf(dev, "wrong freq\n"); return (EIO); } DPRINTF("cpufreq: %d -> %d\n", cur_freq, arm_freq); return (0); } static int bcm2835_cpufreq_get(device_t dev, struct cf_setting *cf) { struct bcm2835_cpufreq_softc *sc; int arm_freq; if (cf == NULL) return (EINVAL); sc = device_get_softc(dev); memset(cf, CPUFREQ_VAL_UNKNOWN, sizeof(*cf)); cf->dev = NULL; /* get cuurent value */ VC_LOCK(sc); arm_freq = bcm2835_cpufreq_get_clock_rate(sc, BCM2835_FIRMWARE_CLOCK_ID_ARM); VC_UNLOCK(sc); if (arm_freq < 0) { device_printf(dev, "can't get clock\n"); return (EINVAL); } /* CPU clock in MHz or 100ths of a percent. */ cf->freq = HZ2MHZ(arm_freq); /* Voltage in mV. */ cf->volts = CPUFREQ_VAL_UNKNOWN; /* Power consumed in mW. */ cf->power = CPUFREQ_VAL_UNKNOWN; /* Transition latency in us. */ cf->lat = TRANSITION_LATENCY; /* Driver providing this setting. */ cf->dev = dev; return (0); } static int bcm2835_cpufreq_make_freq_list(device_t dev, struct cf_setting *sets, int *count) { struct bcm2835_cpufreq_softc *sc; int freq, min_freq, volts, rem; int idx; sc = device_get_softc(dev); freq = sc->arm_max_freq; min_freq = sc->arm_min_freq; /* adjust head freq to STEP */ rem = freq % MHZSTEP; freq -= rem; if (freq < min_freq) freq = min_freq; /* if non-turbo, add extra low freq */ if (sc->turbo_mode != BCM2835_FIRMWARE_TURBO_ON) if (min_freq > cpufreq_lowest_freq) min_freq = cpufreq_lowest_freq; #ifdef SOC_BCM2835 /* from freq to min_freq */ for (idx = 0; idx < *count && freq >= min_freq; idx++) { if (freq > sc->arm_min_freq) volts = sc->max_voltage_core; else volts = sc->min_voltage_core; sets[idx].freq = freq; sets[idx].volts = volts; sets[idx].lat = TRANSITION_LATENCY; sets[idx].dev = dev; freq -= MHZSTEP; } #else /* XXX RPi2 have only 900/600MHz */ idx = 0; volts = sc->min_voltage_core; sets[idx].freq = freq; sets[idx].volts = volts; sets[idx].lat = TRANSITION_LATENCY; sets[idx].dev = dev; idx++; if (freq != min_freq) { sets[idx].freq = min_freq; sets[idx].volts = volts; sets[idx].lat = TRANSITION_LATENCY; sets[idx].dev = dev; idx++; } #endif *count = idx; return (0); } static int bcm2835_cpufreq_settings(device_t dev, struct cf_setting *sets, int *count) { struct bcm2835_cpufreq_softc *sc; if (sets == NULL || count == NULL) return (EINVAL); sc = device_get_softc(dev); if (sc->arm_min_freq < 0 || sc->arm_max_freq < 0) { printf("device is not configured\n"); return (EINVAL); } /* fill data with unknown value */ memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * (*count)); /* create new array up to count */ bcm2835_cpufreq_make_freq_list(dev, sets, count); return (0); } static int bcm2835_cpufreq_type(device_t dev, int *type) { if (type == NULL) return (EINVAL); *type = CPUFREQ_TYPE_ABSOLUTE; return (0); } static device_method_t bcm2835_cpufreq_methods[] = { /* Device interface */ DEVMETHOD(device_identify, bcm2835_cpufreq_identify), DEVMETHOD(device_probe, bcm2835_cpufreq_probe), DEVMETHOD(device_attach, bcm2835_cpufreq_attach), DEVMETHOD(device_detach, bcm2835_cpufreq_detach), /* cpufreq interface */ DEVMETHOD(cpufreq_drv_set, bcm2835_cpufreq_set), DEVMETHOD(cpufreq_drv_get, bcm2835_cpufreq_get), DEVMETHOD(cpufreq_drv_settings, bcm2835_cpufreq_settings), DEVMETHOD(cpufreq_drv_type, bcm2835_cpufreq_type), DEVMETHOD_END }; static driver_t bcm2835_cpufreq_driver = { "bcm2835_cpufreq", bcm2835_cpufreq_methods, sizeof(struct bcm2835_cpufreq_softc), }; DRIVER_MODULE(bcm2835_cpufreq, cpu, bcm2835_cpufreq_driver, 0, 0); MODULE_DEPEND(bcm2835_cpufreq, bcm2835_firmware, 1, 1, 1);