1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Hiroki Sato <hrs@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * Driver for on-die thermal sensor in 88F6282 and 88F6283. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/module.h> 38#include <sys/bus.h> 39#include <sys/sysctl.h> 40 41#include <dev/ofw/ofw_bus.h> 42#include <dev/ofw/ofw_bus_subr.h> 43 44#include <arm/mv/mvreg.h> 45#include <arm/mv/mvvar.h> 46 47static struct resource_spec mvts_res[] = { 48 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 49 { -1, 0 } 50}; 51 52struct mvts_softc { 53 device_t sc_dev; 54 struct resource *sc_res[sizeof(mvts_res)]; 55}; 56 57static int 58ts_probe(device_t dev) 59{ 60 uint32_t d, r; 61 62 if (!ofw_bus_status_okay(dev)) 63 return (ENXIO); 64 65 if (!ofw_bus_is_compatible(dev, "mrvl,ts")) 66 return (ENXIO); 67 soc_id(&d, &r); 68 switch (d) { 69 case MV_DEV_88F6282: 70 break; 71 default: 72 device_printf(dev, "unsupported SoC (ID: 0x%08X)!\n", d); 73 return (ENXIO); 74 } 75 device_set_desc(dev, "Marvell Thermal Sensor"); 76 77 return (0); 78} 79 80#define MV_TEMP_VALID_BIT (1 << 9) 81#define MV_TEMP_SENS_OFFS 10 82#define MV_TEMP_SENS_MASK 0x1ff 83#define MV_TEMP_SENS_READ_MAX 16 84#define TZ_ZEROC 2731 85#define MV_TEMP_CONVERT(x) ((((322 - x) * 100000) / 13625) + TZ_ZEROC) 86 87/* 88 * MSB LSB 89 * 0000 0000 0000 0000 0000 0000 0000 0000 90 * ^- valid bit 91 * |---------| 92 * ^--- temperature (9 bits) 93 */ 94 95static int 96ts_sysctl_handler(SYSCTL_HANDLER_ARGS) 97{ 98 struct mvts_softc *sc; 99 device_t dev; 100 uint32_t ret, ret0; 101 u_int val; 102 int i; 103 104 dev = (device_t)arg1; 105 sc = device_get_softc(dev); 106 val = TZ_ZEROC; 107 108 ret = bus_read_4(sc->sc_res[0], 0); 109 if ((ret & MV_TEMP_VALID_BIT) == 0) { 110 device_printf(dev, "temperature sensor is broken.\n"); 111 goto ts_sysctl_handle_int; 112 } 113 ret0 = 0; 114 for (i = 0; i < MV_TEMP_SENS_READ_MAX; i++) { 115 ret = bus_read_4(sc->sc_res[0], 0); 116 ret = (ret >> MV_TEMP_SENS_OFFS) & MV_TEMP_SENS_MASK; 117 118 /* 119 * Successive reads should returns the same value except 120 * for the LSB when the sensor is normal. 121 */ 122 if (((ret0 ^ ret) & 0x1fe) == 0) 123 break; 124 else 125 ret0 = ret; 126 } 127 if (i == MV_TEMP_SENS_READ_MAX) { 128 device_printf(dev, "temperature sensor is unstable.\n"); 129 goto ts_sysctl_handle_int; 130 } 131 val = (u_int)MV_TEMP_CONVERT(ret); 132 133ts_sysctl_handle_int: 134 return (sysctl_handle_int(oidp, &val, 0, req)); 135} 136 137static int 138ts_attach(device_t dev) 139{ 140 struct mvts_softc *sc; 141 struct sysctl_ctx_list *ctx; 142 int error; 143 144 sc = device_get_softc(dev); 145 sc->sc_dev = dev; 146 error = bus_alloc_resources(dev, mvts_res, sc->sc_res); 147 if (error) { 148 device_printf(dev, "could not allocate resources\n"); 149 return (ENXIO); 150 } 151 ctx = device_get_sysctl_ctx(dev); 152 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 153 OID_AUTO, "temperature", 154 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT, dev, 155 0, ts_sysctl_handler, "IK", "Current Temperature"); 156 157 return (0); 158} 159 160static int 161ts_detach(device_t dev) 162{ 163 164 return (0); 165} 166 167static device_method_t ts_methods[] = { 168 DEVMETHOD(device_probe, ts_probe), 169 DEVMETHOD(device_attach, ts_attach), 170 DEVMETHOD(device_detach, ts_detach), 171 {0, 0}, 172}; 173 174static driver_t ts_driver = { 175 "mvts", 176 ts_methods, 177 sizeof(struct mvts_softc), 178}; 179 180static devclass_t ts_devclass; 181DRIVER_MODULE(mvts, simplebus, ts_driver, ts_devclass, 0, 0); 182MODULE_VERSION(mvts, 1); 183