1 /*- 2 * Copyright (c) 2016 Rubicon Communications, LLC (Netgate) 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/sysctl.h> 34 35 #include <machine/bus.h> 36 37 #include <arm/ti/am335x/am335x_scm.h> 38 #include <arm/ti/ti_cpuid.h> 39 #include <arm/ti/ti_scm.h> 40 41 #include <dev/extres/syscon/syscon.h> 42 #include "syscon_if.h" 43 44 #define TZ_ZEROC 2731 45 46 struct am335x_scm_softc { 47 int sc_last_temp; 48 struct sysctl_oid *sc_temp_oid; 49 struct syscon *syscon; 50 }; 51 52 static int 53 am335x_scm_temp_sysctl(SYSCTL_HANDLER_ARGS) 54 { 55 device_t dev; 56 int i, temp; 57 struct am335x_scm_softc *sc; 58 uint32_t reg; 59 60 dev = (device_t)arg1; 61 sc = device_get_softc(dev); 62 63 /* Read the temperature and convert to Kelvin. */ 64 for(i = 50; i > 0; i--) { 65 reg = SYSCON_READ_4(sc->syscon, SCM_BGAP_CTRL); 66 if ((reg & SCM_BGAP_EOCZ) == 0) 67 break; 68 DELAY(50); 69 } 70 if ((reg & SCM_BGAP_EOCZ) == 0) { 71 sc->sc_last_temp = 72 (reg >> SCM_BGAP_TEMP_SHIFT) & SCM_BGAP_TEMP_MASK; 73 sc->sc_last_temp *= 10; 74 } 75 temp = sc->sc_last_temp + TZ_ZEROC; 76 77 return (sysctl_handle_int(oidp, &temp, 0, req)); 78 } 79 80 static void 81 am335x_scm_identify(driver_t *driver, device_t parent) 82 { 83 device_t child; 84 85 /* AM335x only. */ 86 if (ti_chip() != CHIP_AM335X) 87 return; 88 89 /* Make sure we attach only once. */ 90 if (device_find_child(parent, "am335x_scm", -1) != NULL) 91 return; 92 93 child = device_add_child(parent, "am335x_scm", -1); 94 if (child == NULL) 95 device_printf(parent, "cannot add ti_scm child\n"); 96 } 97 98 static int 99 am335x_scm_probe(device_t dev) 100 { 101 /* Just allow the first one */ 102 if (strcmp(device_get_nameunit(dev), "am335x_scm0") != 0) 103 return (ENXIO); 104 105 device_set_desc(dev, "AM335x Control Module Extension"); 106 107 return (BUS_PROBE_DEFAULT); 108 } 109 110 static int 111 am335x_scm_attach(device_t dev) 112 { 113 struct am335x_scm_softc *sc; 114 struct sysctl_ctx_list *ctx; 115 struct sysctl_oid_list *tree; 116 uint32_t reg; 117 phandle_t opp_table; 118 int err; 119 120 sc = device_get_softc(dev); 121 122 /* FIXME: For now; Go and kidnap syscon from opp-table */ 123 opp_table = OF_finddevice("/opp-table"); 124 if (opp_table == -1) { 125 device_printf(dev, "Cant find /opp-table\n"); 126 return (ENXIO); 127 } 128 if (!OF_hasprop(opp_table, "syscon")) { 129 device_printf(dev, "/opp-table missing syscon property\n"); 130 return (ENXIO); 131 } 132 err = syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon); 133 if (err) { 134 device_printf(dev, "Failed to get syscon\n"); 135 return (ENXIO); 136 } 137 138 /* Reset the digital outputs. */ 139 SYSCON_WRITE_4(sc->syscon, SCM_BGAP_CTRL, 0); 140 reg = SYSCON_READ_4(sc->syscon, SCM_BGAP_CTRL); 141 DELAY(500); 142 /* Set continuous mode. */ 143 SYSCON_WRITE_4(sc->syscon, SCM_BGAP_CTRL, SCM_BGAP_CONTCONV); 144 reg = SYSCON_READ_4(sc->syscon, SCM_BGAP_CTRL); 145 DELAY(500); 146 /* Start the ADC conversion. */ 147 reg = SCM_BGAP_CLRZ | SCM_BGAP_CONTCONV | SCM_BGAP_SOC; 148 SYSCON_WRITE_4(sc->syscon, SCM_BGAP_CTRL, reg); 149 150 /* Temperature sysctl. */ 151 ctx = device_get_sysctl_ctx(dev); 152 tree = SYSCTL_CHILDREN(device_get_sysctl_tree(dev)); 153 sc->sc_temp_oid = SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, 154 "temperature", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 155 dev, 0, am335x_scm_temp_sysctl, "IK", "Current temperature"); 156 157 return (0); 158 } 159 160 static int 161 am335x_scm_detach(device_t dev) 162 { 163 struct am335x_scm_softc *sc; 164 165 sc = device_get_softc(dev); 166 167 /* Remove temperature sysctl. */ 168 if (sc->sc_temp_oid != NULL) 169 sysctl_remove_oid(sc->sc_temp_oid, 1, 0); 170 171 /* Stop the bandgap ADC. */ 172 SYSCON_WRITE_4(sc->syscon, SCM_BGAP_CTRL, SCM_BGAP_BGOFF); 173 174 return (0); 175 } 176 177 static device_method_t am335x_scm_methods[] = { 178 DEVMETHOD(device_identify, am335x_scm_identify), 179 DEVMETHOD(device_probe, am335x_scm_probe), 180 DEVMETHOD(device_attach, am335x_scm_attach), 181 DEVMETHOD(device_detach, am335x_scm_detach), 182 183 DEVMETHOD_END 184 }; 185 186 static driver_t am335x_scm_driver = { 187 "am335x_scm", 188 am335x_scm_methods, 189 sizeof(struct am335x_scm_softc), 190 }; 191 192 DRIVER_MODULE(am335x_scm, ti_scm, am335x_scm_driver, 0, 0); 193 MODULE_VERSION(am335x_scm, 1); 194 MODULE_DEPEND(am335x_scm, ti_scm_syscon, 1, 1, 1); 195