181 lines
4.6 KiB
C
181 lines
4.6 KiB
C
/*-
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* Copyright (c) 2012 Hiroki Sato <hrs@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Driver for on-die thermal sensor in 88F6282 and 88F6283.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/sysctl.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/mv/mvreg.h>
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#include <arm/mv/mvvar.h>
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static struct resource_spec mvts_res[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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struct mvts_softc {
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device_t sc_dev;
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struct resource *sc_res[sizeof(mvts_res)];
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};
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static int
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ts_probe(device_t dev)
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{
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uint32_t d, r;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "mrvl,ts"))
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return (ENXIO);
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soc_id(&d, &r);
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switch (d) {
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case MV_DEV_88F6282:
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break;
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default:
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device_printf(dev, "unsupported SoC (ID: 0x%08X)!\n", d);
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return (ENXIO);
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}
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device_set_desc(dev, "Marvell Thermal Sensor");
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return (0);
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}
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#define MV_TEMP_VALID_BIT (1 << 9)
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#define MV_TEMP_SENS_OFFS 10
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#define MV_TEMP_SENS_MASK 0x1ff
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#define MV_TEMP_SENS_READ_MAX 16
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#define TZ_ZEROC 2732
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#define MV_TEMP_CONVERT(x) ((((322 - x) * 100000) / 13625) + TZ_ZEROC)
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/*
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* MSB LSB
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* 0000 0000 0000 0000 0000 0000 0000 0000
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* ^- valid bit
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* |---------|
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* ^--- temperature (9 bits)
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*/
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static int
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ts_sysctl_handler(SYSCTL_HANDLER_ARGS)
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{
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struct mvts_softc *sc;
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device_t dev;
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uint32_t ret, ret0;
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u_int val;
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int i;
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dev = (device_t)arg1;
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sc = device_get_softc(dev);
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val = TZ_ZEROC;
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ret = bus_read_4(sc->sc_res[0], 0);
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if ((ret & MV_TEMP_VALID_BIT) == 0) {
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device_printf(dev, "temperature sensor is broken.\n");
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goto ts_sysctl_handle_int;
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}
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ret0 = 0;
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for (i = 0; i < MV_TEMP_SENS_READ_MAX; i++) {
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ret = bus_read_4(sc->sc_res[0], 0);
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ret = (ret >> MV_TEMP_SENS_OFFS) & MV_TEMP_SENS_MASK;
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/*
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* Successive reads should returns the same value except
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* for the LSB when the sensor is normal.
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*/
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if (((ret0 ^ ret) & 0x1fe) == 0)
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break;
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else
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ret0 = ret;
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}
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if (i == MV_TEMP_SENS_READ_MAX) {
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device_printf(dev, "temperature sensor is unstable.\n");
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goto ts_sysctl_handle_int;
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}
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val = (u_int)MV_TEMP_CONVERT(ret);
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ts_sysctl_handle_int:
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return (sysctl_handle_int(oidp, &val, 0, req));
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}
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static int
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ts_attach(device_t dev)
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{
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struct mvts_softc *sc;
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struct sysctl_ctx_list *ctx;
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int error;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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error = bus_alloc_resources(dev, mvts_res, sc->sc_res);
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if (error) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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ctx = device_get_sysctl_ctx(dev);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
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OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD, dev,
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0, ts_sysctl_handler, "IK", "Current Temperature");
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return (0);
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}
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static int
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ts_detach(device_t dev)
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{
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return (0);
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}
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static device_method_t ts_methods[] = {
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DEVMETHOD(device_probe, ts_probe),
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DEVMETHOD(device_attach, ts_attach),
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DEVMETHOD(device_detach, ts_detach),
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{0, 0},
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};
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static driver_t ts_driver = {
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"mvts",
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ts_methods,
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sizeof(struct mvts_softc),
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};
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static devclass_t ts_devclass;
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DRIVER_MODULE(mvts, simplebus, ts_driver, ts_devclass, 0, 0);
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MODULE_VERSION(mvts, 1);
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