pcf8563.c revision 1.11
1/* $NetBSD: pcf8563.c,v 1.11 2018/06/26 06:03:57 thorpej Exp $ */ 2 3/* 4 * Copyright (c) 2011 Jonathan A. Kollasch 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 COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29/* XXX */ 30#if defined(__arm__) || defined(__aarch64__) 31#include "opt_fdt.h" 32#endif 33 34#include <sys/cdefs.h> 35__KERNEL_RCSID(0, "$NetBSD: pcf8563.c,v 1.11 2018/06/26 06:03:57 thorpej Exp $"); 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/device.h> 40#include <sys/kernel.h> 41 42#include <dev/clock_subr.h> 43 44#include <dev/i2c/i2cvar.h> 45#include <dev/i2c/pcf8563reg.h> 46 47#ifdef FDT 48#include <dev/fdt/fdtvar.h> 49#endif 50 51static const struct device_compatible_entry compat_data[] = { 52 { "nxp,pcf8563", 0 }, 53 { "pcf8563rtc", 0 }, 54 { NULL, 0 } 55}; 56 57struct pcf8563rtc_softc { 58 device_t sc_dev; 59 i2c_tag_t sc_tag; 60 int sc_addr; 61 struct todr_chip_handle sc_todr; 62}; 63 64static int pcf8563rtc_match(device_t, cfdata_t, void *); 65static void pcf8563rtc_attach(device_t, device_t, void *); 66 67CFATTACH_DECL_NEW(pcf8563rtc, sizeof(struct pcf8563rtc_softc), 68 pcf8563rtc_match, pcf8563rtc_attach, NULL, NULL); 69 70static int pcf8563rtc_clock_read(struct pcf8563rtc_softc *, struct clock_ymdhms *); 71static int pcf8563rtc_clock_write(struct pcf8563rtc_softc *, struct clock_ymdhms *); 72static int pcf8563rtc_gettime(struct todr_chip_handle *, struct clock_ymdhms *); 73static int pcf8563rtc_settime(struct todr_chip_handle *, struct clock_ymdhms *); 74 75static int 76pcf8563rtc_match(device_t parent, cfdata_t cf, void *aux) 77{ 78 struct i2c_attach_args *ia = aux; 79 int match_result; 80 81 if (iic_use_direct_match(ia, cf, compat_data, &match_result)) 82 return match_result; 83 84 /* indirect config - check typical address */ 85 if (ia->ia_addr == PCF8563_ADDR) 86 return I2C_MATCH_ADDRESS_ONLY; 87 88 return 0; 89} 90 91static void 92pcf8563rtc_attach(device_t parent, device_t self, void *aux) 93{ 94 struct pcf8563rtc_softc *sc = device_private(self); 95 struct i2c_attach_args *ia = aux; 96 97 aprint_naive(": Real-time Clock\n"); 98 aprint_normal(": NXP PCF8563 Real-time Clock\n"); 99 100 sc->sc_dev = self; 101 sc->sc_tag = ia->ia_tag; 102 sc->sc_addr = ia->ia_addr; 103 sc->sc_todr.cookie = sc; 104 sc->sc_todr.todr_gettime_ymdhms = pcf8563rtc_gettime; 105 sc->sc_todr.todr_settime_ymdhms = pcf8563rtc_settime; 106 sc->sc_todr.todr_setwen = NULL; 107 108 iic_acquire_bus(sc->sc_tag, I2C_F_POLL); 109 iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS1, 0, 110 I2C_F_POLL); 111 iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS2, 0, 112 I2C_F_POLL); 113 iic_release_bus(sc->sc_tag, I2C_F_POLL); 114 115#ifdef FDT 116 fdtbus_todr_attach(self, ia->ia_cookie, &sc->sc_todr); 117#else 118 todr_attach(&sc->sc_todr); 119#endif 120} 121 122static int 123pcf8563rtc_gettime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 124{ 125 struct pcf8563rtc_softc *sc = ch->cookie; 126 127 if (pcf8563rtc_clock_read(sc, dt) == 0) 128 return -1; 129 130 return 0; 131} 132 133static int 134pcf8563rtc_settime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 135{ 136 struct pcf8563rtc_softc *sc = ch->cookie; 137 138 if (pcf8563rtc_clock_write(sc, dt) == 0) 139 return -1; 140 141 return 0; 142} 143 144static int 145pcf8563rtc_clock_read(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 146{ 147 uint8_t bcd[PCF8563_NREGS]; 148 uint8_t reg = PCF8563_R_SECOND; 149 const int flags = I2C_F_POLL; 150 151 if (iic_acquire_bus(sc->sc_tag, flags)) { 152 device_printf(sc->sc_dev, "acquire bus for read failed\n"); 153 return 0; 154 } 155 156 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1, 157 &bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) { 158 iic_release_bus(sc->sc_tag, flags); 159 device_printf(sc->sc_dev, "read failed\n"); 160 return 0; 161 } 162 163 iic_release_bus(sc->sc_tag, flags); 164 165 if (bcd[PCF8563_R_SECOND] & PCF8563_M_VL) 166 return 0; 167 168 dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND); 169 dt->dt_min = bcdtobin(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE); 170 dt->dt_hour = bcdtobin(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR); 171 dt->dt_day = bcdtobin(bcd[PCF8563_R_DAY] & PCF8563_M_DAY); 172 dt->dt_wday = bcdtobin(bcd[PCF8563_R_WEEKDAY] & PCF8563_M_WEEKDAY); 173 dt->dt_mon = bcdtobin(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH); 174 dt->dt_year = 1900 + 175 (bcdtobin(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR) % 100); 176 if ((bcd[PCF8563_R_MONTH] & PCF8563_M_CENTURY) == 0) 177 dt->dt_year += 100; 178 179 return 1; 180} 181 182static int 183pcf8563rtc_clock_write(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 184{ 185 uint8_t bcd[PCF8563_NREGS]; 186 uint8_t reg = PCF8563_R_SECOND; 187 const int flags = I2C_F_POLL; 188 189 bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec); 190 bcd[PCF8563_R_MINUTE] = bintobcd(dt->dt_min); 191 bcd[PCF8563_R_HOUR] = bintobcd(dt->dt_hour); 192 bcd[PCF8563_R_DAY] = bintobcd(dt->dt_day); 193 bcd[PCF8563_R_WEEKDAY] = bintobcd(dt->dt_wday); 194 bcd[PCF8563_R_MONTH] = bintobcd(dt->dt_mon); 195 bcd[PCF8563_R_YEAR] = bintobcd(dt->dt_year % 100); 196 if (dt->dt_year < 2000) 197 bcd[PCF8563_R_MONTH] |= PCF8563_M_CENTURY; 198 199 if (iic_acquire_bus(sc->sc_tag, flags)) { 200 device_printf(sc->sc_dev, "acquire bus for write failed\n"); 201 return 0; 202 } 203 204 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, ®, 1, 205 &bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) { 206 iic_release_bus(sc->sc_tag, flags); 207 device_printf(sc->sc_dev, "write failed\n"); 208 return 0; 209 } 210 211 iic_release_bus(sc->sc_tag, flags); 212 213 return 1; 214} 215