1 /* $NetBSD: jh71x0_temp.c,v 1.1 2025/01/03 11:49:04 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2025 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: jh71x0_temp.c,v 1.1 2025/01/03 11:49:04 skrll Exp $"); 34 35 #include <sys/param.h> 36 37 #include <dev/fdt/fdtvar.h> 38 39 #include <dev/sysmon/sysmonvar.h> 40 41 struct jh71x0_temp_softc { 42 device_t sc_dev; 43 bus_space_tag_t sc_bst; 44 bus_space_handle_t sc_bsh; 45 int sc_phandle; 46 47 struct sysmon_envsys * sc_sme; 48 envsys_data_t sc_sensor; 49 }; 50 51 #define RD4(sc, reg) \ 52 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 53 #define WR4(sc, reg, val) \ 54 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 55 56 /* Register definitions */ 57 #define JH71X0_TEMP 0x0000 58 #define JH71X0_TEMP_RSTN __BIT(0) 59 #define JH71X0_TEMP_PD __BIT(1) 60 #define JH71X0_TEMP_RUN __BIT(2) 61 #define JH71X0_TEMP_DOUT_MASK __BITS(27, 16) 62 63 /* DOUT to Celcius conversion constants */ 64 #define JH71X0TEMP_Y1000 237500L 65 #define JH71X0TEMP_Z 4094L 66 #define JH71X0TEMP_K1000 81100L 67 68 /* Calculate the temperature in milli Celcius */ 69 static int32_t 70 jh71x0_temp_get(struct jh71x0_temp_softc *sc) 71 { 72 uint32_t temp = RD4(sc, JH71X0_TEMP); 73 uint32_t dout = __SHIFTOUT(temp, JH71X0_TEMP_DOUT_MASK); 74 75 return (dout * JH71X0TEMP_Y1000) / JH71X0TEMP_Z - JH71X0TEMP_K1000; 76 } 77 78 static void 79 jh71x0_temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 80 { 81 struct jh71x0_temp_softc * const sc = sme->sme_cookie; 82 83 // Convert milli Celcius to micro Kelvin 84 sc->sc_sensor.value_cur = 273150000 + 1000 * jh71x0_temp_get(sc); 85 sc->sc_sensor.state = ENVSYS_SVALID; 86 } 87 88 static void 89 jh71x0_temp_init(struct jh71x0_temp_softc *sc) 90 { 91 /* Power down */ 92 WR4(sc, JH71X0_TEMP, JH71X0_TEMP_PD); 93 delay(1); 94 95 /* Power up with reset asserted */ 96 WR4(sc, JH71X0_TEMP, 0); 97 delay(60); 98 99 /* Deassert reset */ 100 WR4(sc, JH71X0_TEMP, JH71X0_TEMP_RSTN); 101 delay(1); 102 103 /* Start measuring */ 104 WR4(sc, JH71X0_TEMP, JH71X0_TEMP_RSTN | JH71X0_TEMP_RUN); 105 } 106 107 /* Compat string(s) */ 108 static const struct device_compatible_entry compat_data[] = { 109 { .compat = "starfive,jh7100-temp" }, 110 { .compat = "starfive,jh7110-temp" }, 111 DEVICE_COMPAT_EOL 112 }; 113 114 static int 115 jh71x0_temp_match(device_t parent, cfdata_t cf, void *aux) 116 { 117 struct fdt_attach_args * const faa = aux; 118 119 return of_compatible_match(faa->faa_phandle, compat_data); 120 } 121 122 static void 123 jh71x0_temp_attach(device_t parent, device_t self, void *aux) 124 { 125 struct jh71x0_temp_softc * const sc = device_private(self); 126 struct fdt_attach_args * const faa = aux; 127 const int phandle = faa->faa_phandle; 128 bus_addr_t addr; 129 bus_size_t size; 130 int error; 131 132 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 133 aprint_error(": couldn't get registers\n"); 134 return; 135 } 136 137 sc->sc_dev = self; 138 sc->sc_phandle = phandle; 139 sc->sc_bst = faa->faa_bst; 140 141 error = bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh); 142 if (error) { 143 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, 144 error); 145 return; 146 } 147 148 const char *crs[] = { "bus", "sense" }; 149 for (size_t i = 0; i < __arraycount(crs); i++) { 150 const char *cr = crs[i]; 151 152 error = fdtbus_clock_enable(phandle, cr, true); 153 if (error) { 154 aprint_error(": couldn't enable clock '%s'\n", cr); 155 return; 156 } 157 struct fdtbus_reset * rst = fdtbus_reset_get(phandle, cr); 158 if (rst == NULL) { 159 aprint_error(": couldn't get reset '%s'\n", cr); 160 return; 161 } 162 error = fdtbus_reset_deassert(rst); 163 if (error) { 164 aprint_error(": couldn't de-assert reset '%s'\n", cr); 165 return; 166 } 167 } 168 169 aprint_naive("\n"); 170 aprint_normal(": JH71x0 temperature sensor\n"); 171 172 jh71x0_temp_init(sc); 173 174 sc->sc_sme = sysmon_envsys_create(); 175 /* Initialize sensor data. */ 176 sc->sc_sensor.units = ENVSYS_STEMP; 177 sc->sc_sensor.state = ENVSYS_SINVALID; 178 (void)strlcpy(sc->sc_sensor.desc, device_xname(self), 179 sizeof(sc->sc_sensor.desc)); 180 if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) { 181 sysmon_envsys_destroy(sc->sc_sme); 182 return; 183 } 184 185 /* Hook into system monitor. */ 186 sc->sc_sme->sme_name = device_xname(self); 187 sc->sc_sme->sme_cookie = sc; 188 sc->sc_sme->sme_refresh = jh71x0_temp_refresh; 189 190 if (sysmon_envsys_register(sc->sc_sme)) { 191 aprint_error_dev(self, "unable to register with sysmon\n"); 192 sysmon_envsys_destroy(sc->sc_sme); 193 } 194 } 195 196 CFATTACH_DECL_NEW(jh71x0_temp, sizeof(struct jh71x0_temp_softc), 197 jh71x0_temp_match, jh71x0_temp_attach, NULL, NULL); 198
Indexes created Sat Sep 20 22:09:52 GMT 2025