/* $NetBSD: omap3_scm.c,v 1.2 2013/03/13 03:08:17 khorben Exp $ */ /*- * Copyright (c) 2013 Jared D. McNeill * 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. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: omap3_scm.c,v 1.2 2013/03/13 03:08:17 khorben Exp $"); #include "opt_omap.h" #include #include #include #include #include #include #include #include #include #include #include #define SCM_BASE_3530 0x48002000 #define SCM_SIZE_3530 0x1000 #define SCM_OFFSET_INTERFACE_3530 0 #define SCM_OFFSET_GENERAL_3530 0x270 #if defined(OMAP_3430) || defined(OMAP_3530) #define SCM_BASE SCM_BASE_3530 #define SCM_SIZE SCM_SIZE_3530 #define SCM_OFFSET_INTERFACE SCM_OFFSET_INTERFACE_3530 #define SCM_OFFSET_GENERAL SCM_OFFSET_GENERAL_3530 #endif /* INTERFACE */ #define CONTROL_REVISION (SCM_OFFSET_INTERFACE + 0x00) /* GENERAL */ #define CONTROL_TEMP_SENSOR (SCM_OFFSET_GENERAL + 0x2b4) #define CONTROL_TEMP_SENSOR_CONTCONV __BIT(9) #define CONTROL_TEMP_SENSOR_SOC __BIT(8) #define CONTROL_TEMP_SENSOR_EOCZ __BIT(7) #define CONTROL_TEMP_SENSOR_TEMP_MASK __BITS(6,0) /* CONTROL_TEMP_SENSOR TEMP bits to tenths of a degree */ static const int omap3_scm_adc2temp[128] = { -400, -400, -400, -400, -400, -389, -375, -361, -333, -318, -304, -290, -275, -261, -247, -233, -219, -205, -191, -177, -163, -149, -134, -120, -106, -92, -78, -64, -50, -35, -21, -7, 8, 23, 37, 51, 66, 80, 94, 108, 123, 137, 151, 165, 179, 194, 208, 222, 236, 251, 265, 279, 293, 307, 321, 335, 349, 364, 378, 392, 306, 420, 434, 449, 463, 477, 491, 505, 519, 533, 546, 560, 574, 588, 602, 616, 630, 644, 657, 671, 685, 699, 713, 727, 741, 755, 769, 783, 797, 811, 823, 838, 852, 865, 879, 893, 906, 920, 934, 947, 961, 975, 989, 1002, 1016, 1030, 1043, 1057, 1071, 1085, 1098, 1112, 1126, 1140, 1153, 1167, 1181, 1194, 1208, 1222, 1235, 1249, 1250, 1250, 1250, 1250, 1250, 1250 }; struct omap3_scm_softc { device_t sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; /* GENERAL */ struct sysmon_envsys *sc_sme; envsys_data_t sc_sensor; }; #define SCM_READ_REG(sc, reg) \ bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)) #define SCM_WRITE_REG(sc, reg, val) \ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) static int omap3_scm_match(device_t, cfdata_t, void *); static void omap3_scm_attach(device_t, device_t, void *); static void omap3_scm_sensor_attach(struct omap3_scm_softc *); static void omap3_scm_sensor_refresh(struct sysmon_envsys *, envsys_data_t *); CFATTACH_DECL2_NEW(omap3_scm, sizeof(struct omap3_scm_softc), omap3_scm_match, omap3_scm_attach, NULL, NULL, NULL, NULL); static int omap3_scm_match(device_t parent, cfdata_t match, void *opaque) { struct obio_attach_args *obio = opaque; if (obio->obio_addr == SCM_BASE) return 1; return 0; } static void omap3_scm_attach(device_t parent, device_t self, void *opaque) { struct omap3_scm_softc *sc = device_private(self); struct obio_attach_args *obio = opaque; uint32_t rev; aprint_naive("\n"); KASSERT(obio->obio_size == SCM_SIZE); sc->sc_dev = self; sc->sc_iot = obio->obio_iot; if (bus_space_map(obio->obio_iot, obio->obio_addr, obio->obio_size, 0, &sc->sc_ioh) != 0) { aprint_error(": couldn't map address space\n"); return; } rev = SCM_READ_REG(sc, CONTROL_REVISION); aprint_normal(": rev. 0x%x\n", rev & 0xff); omap3_scm_sensor_attach(sc); } static void omap3_scm_sensor_attach(struct omap3_scm_softc *sc) { uint32_t ctrl; /* Enable single conversion mode */ ctrl = SCM_READ_REG(sc, CONTROL_TEMP_SENSOR); ctrl &= ~CONTROL_TEMP_SENSOR_CONTCONV; SCM_WRITE_REG(sc, CONTROL_TEMP_SENSOR, ctrl); sc->sc_sme = sysmon_envsys_create(); sc->sc_sme->sme_cookie = sc; sc->sc_sme->sme_name = device_xname(sc->sc_dev); sc->sc_sme->sme_refresh = omap3_scm_sensor_refresh; sc->sc_sensor.units = ENVSYS_STEMP; sc->sc_sensor.state = ENVSYS_SINVALID; sc->sc_sensor.flags = ENVSYS_FHAS_ENTROPY; strlcpy(sc->sc_sensor.desc, "TEMP", sizeof(sc->sc_sensor.desc)); sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor); sysmon_envsys_register(sc->sc_sme); } static void omap3_scm_sensor_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) { struct omap3_scm_softc *sc = sme->sme_cookie; int64_t val; uint32_t ctrl; int retry; edata->state = ENVSYS_SINVALID; /* If ADC is idle (EOCZ=0), request a single temperature conversion */ ctrl = SCM_READ_REG(sc, CONTROL_TEMP_SENSOR); if ((ctrl & CONTROL_TEMP_SENSOR_EOCZ) == 0) { /* Set SOC and wait until EOCZ is set */ ctrl |= CONTROL_TEMP_SENSOR_SOC; SCM_WRITE_REG(sc, CONTROL_TEMP_SENSOR, ctrl); for (retry = 1000; retry > 0; retry--) { ctrl = SCM_READ_REG(sc, CONTROL_TEMP_SENSOR); if (ctrl & CONTROL_TEMP_SENSOR_EOCZ) break; delay(1000); } if (retry == 0) return; /* Clear SOC and wait until EOCZ is cleared */ ctrl &= ~CONTROL_TEMP_SENSOR_SOC; SCM_WRITE_REG(sc, CONTROL_TEMP_SENSOR, ctrl); for (retry = 1000; retry > 0; retry--) { ctrl = SCM_READ_REG(sc, CONTROL_TEMP_SENSOR); if ((ctrl & CONTROL_TEMP_SENSOR_EOCZ) == 0) break; delay(1000); } if (retry == 0) return; /* Once EOCZ is cleared, TEMP bits are valid */ val = omap3_scm_adc2temp[ctrl & CONTROL_TEMP_SENSOR_TEMP_MASK]; edata->value_cur = val * (1000000/10) + 273150000; edata->state = ENVSYS_SVALID; } }