/* $OpenBSD: abx80x.c,v 1.1 2019/01/02 21:15:47 patrick Exp $ */ /* * Copyright (c) 2018 Mark Kettenis * Copyright (c) 2018 Patrick Wildt * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include extern todr_chip_handle_t todr_handle; #define ABX8XX_HTH 0x00 #define ABX8XX_SC 0x01 #define ABX8XX_MN 0x02 #define ABX8XX_HR 0x03 #define ABX8XX_DA 0x04 #define ABX8XX_MO 0x05 #define ABX8XX_YR 0x06 #define ABX8XX_WD 0x07 #define ABX8XX_CTRL 0x10 #define ABX8XX_CTRL_WRITE (1 << 0) #define ABX8XX_CTRL_ARST (1 << 2) #define ABX8XX_CTRL_12_24 (1 << 6) #define ABX8XX_CD_TIMER_CTL 0x18 #define ABX8XX_CD_TIMER_CTL_EN (1 << 2) #define ABX8XX_OSS 0x1d #define ABX8XX_OSS_OF (1 << 1) #define ABX8XX_OSS_OMODE (1 << 4) #define ABX8XX_NRTC_REGS 8 struct abcrtc_softc { struct device sc_dev; i2c_tag_t sc_tag; i2c_addr_t sc_addr; struct todr_chip_handle sc_todr; }; int abcrtc_match(struct device *, void *, void *); void abcrtc_attach(struct device *, struct device *, void *); struct cfattach abcrtc_ca = { sizeof(struct abcrtc_softc), abcrtc_match, abcrtc_attach }; struct cfdriver abcrtc_cd = { NULL, "abcrtc", DV_DULL }; uint8_t abcrtc_reg_read(struct abcrtc_softc *, int); void abcrtc_reg_write(struct abcrtc_softc *, int, uint8_t); int abcrtc_clock_read(struct abcrtc_softc *, struct clock_ymdhms *); int abcrtc_clock_write(struct abcrtc_softc *, struct clock_ymdhms *); int abcrtc_gettime(struct todr_chip_handle *, struct timeval *); int abcrtc_settime(struct todr_chip_handle *, struct timeval *); int abcrtc_match(struct device *parent, void *match, void *aux) { struct i2c_attach_args *ia = aux; if (strcmp(ia->ia_name, "abracon,ab1805") == 0) return 1; return 0; } void abcrtc_attach(struct device *parent, struct device *self, void *aux) { struct abcrtc_softc *sc = (struct abcrtc_softc *)self; struct i2c_attach_args *ia = aux; uint8_t reg; sc->sc_tag = ia->ia_tag; sc->sc_addr = ia->ia_addr; reg = abcrtc_reg_read(sc, ABX8XX_CTRL); reg &= ~(ABX8XX_CTRL_ARST | ABX8XX_CTRL_12_24); reg |= ABX8XX_CTRL_WRITE; abcrtc_reg_write(sc, ABX8XX_CTRL, reg); abcrtc_reg_write(sc, ABX8XX_CD_TIMER_CTL, ABX8XX_CD_TIMER_CTL_EN); sc->sc_todr.cookie = sc; sc->sc_todr.todr_gettime = abcrtc_gettime; sc->sc_todr.todr_settime = abcrtc_settime; todr_handle = &sc->sc_todr; printf("\n"); } int abcrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv) { struct abcrtc_softc *sc = handle->cookie; struct clock_ymdhms dt; int error; error = abcrtc_clock_read(sc, &dt); if (error) return error; if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 || dt.dt_day > 31 || dt.dt_day == 0 || dt.dt_mon > 12 || dt.dt_mon == 0 || dt.dt_year < POSIX_BASE_YEAR) return EINVAL; tv->tv_sec = clock_ymdhms_to_secs(&dt); tv->tv_usec = 0; return 0; } int abcrtc_settime(struct todr_chip_handle *handle, struct timeval *tv) { struct abcrtc_softc *sc = handle->cookie; struct clock_ymdhms dt; clock_secs_to_ymdhms(tv->tv_sec, &dt); return abcrtc_clock_write(sc, &dt); } uint8_t abcrtc_reg_read(struct abcrtc_softc *sc, int reg) { uint8_t cmd = reg; uint8_t val[2]; int error; iic_acquire_bus(sc->sc_tag, I2C_F_POLL); error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL); iic_release_bus(sc->sc_tag, I2C_F_POLL); if (error) { printf("%s: can't read register 0x%02x\n", sc->sc_dev.dv_xname, reg); return 0xff; } return val[1]; } void abcrtc_reg_write(struct abcrtc_softc *sc, int reg, uint8_t data) { uint8_t cmd = reg; uint8_t val[2]; int error; val[0] = 1; val[1] = reg; iic_acquire_bus(sc->sc_tag, I2C_F_POLL); error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, &cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL); iic_release_bus(sc->sc_tag, I2C_F_POLL); if (error) { printf("%s: can't write register 0x%02x\n", sc->sc_dev.dv_xname, reg); } } int abcrtc_clock_read(struct abcrtc_softc *sc, struct clock_ymdhms *dt) { uint8_t regs[ABX8XX_NRTC_REGS+1]; uint8_t cmd = ABX8XX_HTH; int error; /* Don't trust the RTC if the oscillator failure is set. */ if ((abcrtc_reg_read(sc, ABX8XX_OSS) & ABX8XX_OSS_OMODE) == 0 && (abcrtc_reg_read(sc, ABX8XX_OSS) & ABX8XX_OSS_OF) != 0) return EIO; iic_acquire_bus(sc->sc_tag, I2C_F_POLL); error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, &cmd, sizeof(cmd), regs, sizeof(regs), I2C_F_POLL); iic_release_bus(sc->sc_tag, I2C_F_POLL); if (error) { printf("%s: can't read RTC\n", sc->sc_dev.dv_xname); return error; } /* * Convert the ABX8XX's register values into something useable. */ dt->dt_sec = FROMBCD(regs[2] & 0x7f); dt->dt_min = FROMBCD(regs[3] & 0x7f); dt->dt_hour = FROMBCD(regs[4] & 0x3f); dt->dt_day = FROMBCD(regs[5] & 0x3f); dt->dt_mon = FROMBCD(regs[6] & 0x1f); dt->dt_year = FROMBCD(regs[7]) + 2000; dt->dt_wday = regs[8] & 0x7; return 0; } int abcrtc_clock_write(struct abcrtc_softc *sc, struct clock_ymdhms *dt) { uint8_t regs[ABX8XX_NRTC_REGS+1]; uint8_t cmd = ABX8XX_HTH; uint8_t reg; int error; /* * Convert our time representation into something the ABX8XX * can understand. */ regs[0] = ABX8XX_NRTC_REGS; regs[1] = 0; regs[2] = TOBCD(dt->dt_sec); regs[3] = TOBCD(dt->dt_min); regs[4] = TOBCD(dt->dt_hour); regs[5] = TOBCD(dt->dt_day); regs[6] = TOBCD(dt->dt_mon); regs[7] = TOBCD(dt->dt_year - 2000); regs[8] = dt->dt_wday; iic_acquire_bus(sc->sc_tag, I2C_F_POLL); error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, &cmd, sizeof(cmd), regs, sizeof(regs), I2C_F_POLL); iic_release_bus(sc->sc_tag, I2C_F_POLL); if (error) { printf("%s: can't write RTC\n", sc->sc_dev.dv_xname); return error; } /* Clear oscillator failure. */ reg = abcrtc_reg_read(sc, ABX8XX_OSS); reg &= ~ABX8XX_OSS_OF; abcrtc_reg_write(sc, ABX8XX_OSS, reg); return 0; }