Date: Wed, 31 Aug 2016 07:42:46 +0000 (UTC) From: Luiz Otavio O Souza <loos@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r305115 - head/sys/arm/ti/am335x Message-ID: <201608310742.u7V7gkjS004081@repo.freebsd.org>
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Author: loos Date: Wed Aug 31 07:42:46 2016 New Revision: 305115 URL: https://svnweb.freebsd.org/changeset/base/305115 Log: Add a driver for the AM335x bandgap sensor, an on-die temperature sensor as part of the AM335x control module extension. TI says that the bandgap sensor is not very accurate on AM335x, but in our tests it seems to be a good reference for the SoC temperature. TI details: http://processors.wiki.ti.com/index.php/AM335x_Thermal_Considerations#Measuring_Case_Temperature Sponsored by: Rubicon Communications, LLC (Netgate) Added: head/sys/arm/ti/am335x/am335x_scm.c (contents, props changed) Modified: head/sys/arm/ti/am335x/am335x_scm.h head/sys/arm/ti/am335x/files.am335x Added: head/sys/arm/ti/am335x/am335x_scm.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/arm/ti/am335x/am335x_scm.c Wed Aug 31 07:42:46 2016 (r305115) @@ -0,0 +1,169 @@ +/*- + * Copyright (c) 2016 Rubicon Communications, LLC (Netgate) + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/sysctl.h> + +#include <machine/bus.h> + +#include <arm/ti/am335x/am335x_scm.h> +#include <arm/ti/ti_cpuid.h> +#include <arm/ti/ti_scm.h> + +#define TZ_ZEROC 2731 + +struct am335x_scm_softc { + int sc_last_temp; + struct sysctl_oid *sc_temp_oid; +}; + +static int +am335x_scm_temp_sysctl(SYSCTL_HANDLER_ARGS) +{ + device_t dev; + int i, temp; + struct am335x_scm_softc *sc; + uint32_t reg; + + dev = (device_t)arg1; + sc = device_get_softc(dev); + + /* Read the temperature and convert to Kelvin. */ + for(i = 50; i > 0; i--) { + ti_scm_reg_read_4(SCM_BGAP_CTRL, ®); + if ((reg & SCM_BGAP_EOCZ) == 0) + break; + DELAY(50); + } + if ((reg & SCM_BGAP_EOCZ) == 0) { + sc->sc_last_temp = + (reg >> SCM_BGAP_TEMP_SHIFT) & SCM_BGAP_TEMP_MASK; + sc->sc_last_temp *= 10; + } + temp = sc->sc_last_temp + TZ_ZEROC; + + return (sysctl_handle_int(oidp, &temp, 0, req)); +} + +static void +am335x_scm_identify(driver_t *driver, device_t parent) +{ + device_t child; + + /* AM335x only. */ + if (ti_chip() != CHIP_AM335X) + return; + + /* Make sure we attach only once. */ + if (device_find_child(parent, "am335x_scm", -1) != NULL) + return; + + child = device_add_child(parent, "am335x_scm", -1); + if (child == NULL) + device_printf(parent, "cannot add ti_scm child\n"); +} + +static int +am335x_scm_probe(device_t dev) +{ + + device_set_desc(dev, "AM335x Control Module Extension"); + + return (BUS_PROBE_DEFAULT); +} + +static int +am335x_scm_attach(device_t dev) +{ + struct am335x_scm_softc *sc; + struct sysctl_ctx_list *ctx; + struct sysctl_oid_list *tree; + uint32_t reg; + + /* Set ADC to continous mode, clear output reset. */ + reg = SCM_BGAP_CLRZ | SCM_BGAP_CONTCONV; + ti_scm_reg_write_4(SCM_BGAP_CTRL, reg); + /* Flush write. */ + ti_scm_reg_read_4(SCM_BGAP_CTRL, ®); + /* Start the ADC conversion. */ + reg = SCM_BGAP_CLRZ | SCM_BGAP_CONTCONV | SCM_BGAP_SOC; + ti_scm_reg_write_4(SCM_BGAP_CTRL, reg); + + /* Temperature sysctl. */ + sc = device_get_softc(dev); + ctx = device_get_sysctl_ctx(dev); + tree = SYSCTL_CHILDREN(device_get_sysctl_tree(dev)); + sc->sc_temp_oid = SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, + "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, + dev, 0, am335x_scm_temp_sysctl, "IK", "Current temperature"); + + return (0); +} + +static int +am335x_scm_detach(device_t dev) +{ + struct am335x_scm_softc *sc; + + sc = device_get_softc(dev); + + /* Remove temperature sysctl. */ + if (sc->sc_temp_oid != NULL) + sysctl_remove_oid(sc->sc_temp_oid, 1, 0); + + /* Stop the bandgap ADC. */ + ti_scm_reg_write_4(SCM_BGAP_CTRL, SCM_BGAP_BGOFF); + + return (0); +} + +static device_method_t am335x_scm_methods[] = { + DEVMETHOD(device_identify, am335x_scm_identify), + DEVMETHOD(device_probe, am335x_scm_probe), + DEVMETHOD(device_attach, am335x_scm_attach), + DEVMETHOD(device_detach, am335x_scm_detach), + + DEVMETHOD_END +}; + +static driver_t am335x_scm_driver = { + "am335x_scm", + am335x_scm_methods, + sizeof(struct am335x_scm_softc), +}; + +static devclass_t am335x_scm_devclass; + +DRIVER_MODULE(am335x_scm, ti_scm, am335x_scm_driver, am335x_scm_devclass, 0, 0); +MODULE_VERSION(am335x_scm, 1); +MODULE_DEPEND(am335x_scm, ti_scm, 1, 1, 1); Modified: head/sys/arm/ti/am335x/am335x_scm.h ============================================================================== --- head/sys/arm/ti/am335x/am335x_scm.h Wed Aug 31 07:22:14 2016 (r305114) +++ head/sys/arm/ti/am335x/am335x_scm.h Wed Aug 31 07:42:46 2016 (r305115) @@ -30,6 +30,14 @@ /* AM335x-specific registers for control module (scm) */ #define SCM_CTRL_STATUS 0x40 +#define SCM_BGAP_CTRL 0x448 +#define SCM_BGAP_TEMP_MASK 0xff +#define SCM_BGAP_TEMP_SHIFT 8 +#define SCM_BGAP_BGOFF (1 << 6) +#define SCM_BGAP_SOC (1 << 4) +#define SCM_BGAP_CLRZ (1 << 3) +#define SCM_BGAP_CONTCONV (1 << 2) +#define SCM_BGAP_EOCZ (1 << 1) #define SCM_USB_CTRL0 0x620 #define SCM_USB_STS0 0x624 #define SCM_USB_CTRL1 0x628 Modified: head/sys/arm/ti/am335x/files.am335x ============================================================================== --- head/sys/arm/ti/am335x/files.am335x Wed Aug 31 07:22:14 2016 (r305114) +++ head/sys/arm/ti/am335x/files.am335x Wed Aug 31 07:42:46 2016 (r305115) @@ -13,6 +13,7 @@ arm/ti/am335x/am335x_pwmss.c standard arm/ti/am335x/am335x_ehrpwm.c standard arm/ti/am335x/am335x_ecap.c standard arm/ti/am335x/am335x_rtc.c optional am335x_rtc +arm/ti/am335x/am335x_scm.c standard arm/ti/am335x/am335x_scm_padconf.c standard arm/ti/am335x/am335x_usbss.c optional musb fdt arm/ti/am335x/am335x_musb.c optional musb fdt
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