aafdb08c5a
-Wcast-qual differently, by instead changing the signatore of those "functions" to take a "volatile struct timeval*" instead of a "struct timeval*". Many places, these functions are called with &time, and time is declared as volatile in <sys/kernel.h>. This way we can get rid of all the ugly casts which now also triggered warnings, and caused more code to be added to work around the problem. Reviewed by thorpej.
484 lines
13 KiB
C
484 lines
13 KiB
C
/* $NetBSD: max6900.c,v 1.2 2005/06/04 20:14:25 he Exp $ */
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/*
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* Copyright (c) 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Steve C. Woodford and Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/uio.h>
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#include <sys/conf.h>
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#include <sys/event.h>
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#include <dev/clock_subr.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/i2c/max6900reg.h>
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struct maxrtc_softc {
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struct device sc_dev;
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i2c_tag_t sc_tag;
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int sc_address;
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int sc_open;
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struct todr_chip_handle sc_todr;
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};
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static int maxrtc_match(struct device *, struct cfdata *, void *);
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static void maxrtc_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(maxrtc, sizeof(struct maxrtc_softc),
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maxrtc_match, maxrtc_attach, NULL, NULL);
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extern struct cfdriver maxrtc_cd;
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dev_type_open(maxrtc_open);
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dev_type_close(maxrtc_close);
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dev_type_read(maxrtc_read);
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dev_type_write(maxrtc_write);
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const struct cdevsw maxrtc_cdevsw = {
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maxrtc_open, maxrtc_close, maxrtc_read, maxrtc_write, noioctl,
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nostop, notty, nopoll, nommap, nokqfilter
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};
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static int maxrtc_clock_read(struct maxrtc_softc *, struct clock_ymdhms *);
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static int maxrtc_clock_write(struct maxrtc_softc *, struct clock_ymdhms *);
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static int maxrtc_gettime(struct todr_chip_handle *, volatile struct timeval *);
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static int maxrtc_settime(struct todr_chip_handle *, volatile struct timeval *);
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static int maxrtc_getcal(struct todr_chip_handle *, int *);
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static int maxrtc_setcal(struct todr_chip_handle *, int);
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int
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maxrtc_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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if ((ia->ia_addr & MAX6900_ADDRMASK) == MAX6900_ADDR)
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return (1);
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return (0);
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}
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void
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maxrtc_attach(struct device *parent, struct device *self, void *aux)
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{
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struct maxrtc_softc *sc = (struct maxrtc_softc *)self;
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struct i2c_attach_args *ia = aux;
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sc->sc_tag = ia->ia_tag;
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sc->sc_address = ia->ia_addr;
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aprint_naive(": Real-time Clock/NVRAM\n");
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aprint_normal(": MAX6900 Real-time Clock/NVRAM\n");
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sc->sc_open = 0;
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sc->sc_todr.cookie = sc;
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sc->sc_todr.todr_gettime = maxrtc_gettime;
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sc->sc_todr.todr_settime = maxrtc_settime;
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sc->sc_todr.todr_getcal = maxrtc_getcal;
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sc->sc_todr.todr_setcal = maxrtc_setcal;
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sc->sc_todr.todr_setwen = NULL;
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todr_attach(&sc->sc_todr);
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}
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/*ARGSUSED*/
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int
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maxrtc_open(dev_t dev, int flag, int fmt, struct proc *p)
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{
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struct maxrtc_softc *sc;
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if ((sc = device_lookup(&maxrtc_cd, minor(dev))) == NULL)
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return (ENXIO);
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/* XXX: Locking */
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if (sc->sc_open)
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return (EBUSY);
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sc->sc_open = 1;
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return (0);
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}
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/*ARGSUSED*/
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int
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maxrtc_close(dev_t dev, int flag, int fmt, struct proc *p)
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{
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struct maxrtc_softc *sc;
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if ((sc = device_lookup(&maxrtc_cd, minor(dev))) == NULL)
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return (ENXIO);
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sc->sc_open = 0;
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return (0);
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}
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/*ARGSUSED*/
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int
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maxrtc_read(dev_t dev, struct uio *uio, int flags)
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{
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struct maxrtc_softc *sc;
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u_int8_t ch, cmdbuf[1];
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int a, error;
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if ((sc = device_lookup(&maxrtc_cd, minor(dev))) == NULL)
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return (ENXIO);
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if (uio->uio_offset >= MAX6900_RAM_BYTES)
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return (EINVAL);
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if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0)
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return (error);
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while (uio->uio_resid && uio->uio_offset < MAX6900_RAM_BYTES) {
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a = (int)uio->uio_offset;
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cmdbuf[0] = MAX6900_REG_RAM(a) | MAX6900_CMD_READ;
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if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
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sc->sc_address, cmdbuf, 1,
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&ch, 1, 0)) != 0) {
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iic_release_bus(sc->sc_tag, 0);
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printf("%s: maxrtc_read: read failed at 0x%x\n",
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sc->sc_dev.dv_xname, a);
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return (error);
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}
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if ((error = uiomove(&ch, 1, uio)) != 0) {
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iic_release_bus(sc->sc_tag, 0);
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return (error);
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}
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}
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iic_release_bus(sc->sc_tag, 0);
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return (0);
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}
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/*ARGSUSED*/
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int
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maxrtc_write(dev_t dev, struct uio *uio, int flags)
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{
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struct maxrtc_softc *sc;
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u_int8_t cmdbuf[2];
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int a, error, sverror;
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if ((sc = device_lookup(&maxrtc_cd, minor(dev))) == NULL)
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return (ENXIO);
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if (uio->uio_offset >= MAX6900_RAM_BYTES)
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return (EINVAL);
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if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0)
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return (error);
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/* Start by clearing the control register's write-protect bit. */
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cmdbuf[0] = MAX6900_REG_CONTROL | MAX6900_CMD_WRITE;
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cmdbuf[1] = 0;
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if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE, sc->sc_address,
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cmdbuf, 1, &cmdbuf[1], 1, 0)) != 0) {
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iic_release_bus(sc->sc_tag, 0);
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printf("%s: maxrtc_write: failed to clear WP bit\n",
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sc->sc_dev.dv_xname);
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return (error);
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}
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while (uio->uio_resid && uio->uio_offset < MAX6900_RAM_BYTES) {
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a = (int)uio->uio_offset;
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cmdbuf[0] = MAX6900_REG_RAM(a) | MAX6900_CMD_WRITE;
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if ((error = uiomove(&cmdbuf[1], 1, uio)) != 0)
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break;
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if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE, sc->sc_address,
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cmdbuf, 1, &cmdbuf[1], 1, 0)) != 0) {
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printf("%s: maxrtc_write: write failed at 0x%x\n",
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sc->sc_dev.dv_xname, a);
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break;
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}
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}
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/* Set the write-protect bit again. */
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cmdbuf[0] = MAX6900_REG_CONTROL | MAX6900_CMD_WRITE;
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cmdbuf[1] = MAX6900_CONTROL_WP;
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sverror = error;
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if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
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sc->sc_address, cmdbuf, 1,
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&cmdbuf[1], 1, 0)) != 0) {
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if (sverror != 0)
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error = sverror;
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printf("%s: maxrtc_write: failed to set WP bit\n",
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sc->sc_dev.dv_xname);
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}
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iic_release_bus(sc->sc_tag, 0);
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return (error);
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}
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static int
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maxrtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv)
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{
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struct maxrtc_softc *sc = ch->cookie;
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struct clock_ymdhms dt;
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if (maxrtc_clock_read(sc, &dt) == 0)
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return (-1);
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tv->tv_sec = clock_ymdhms_to_secs(&dt);
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tv->tv_usec = 0;
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return (0);
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}
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static int
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maxrtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv)
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{
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struct maxrtc_softc *sc = ch->cookie;
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struct clock_ymdhms dt;
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clock_secs_to_ymdhms(tv->tv_sec, &dt);
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if (maxrtc_clock_write(sc, &dt) == 0)
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return (-1);
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return (0);
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}
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static int
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maxrtc_setcal(struct todr_chip_handle *ch, int cal)
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{
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return (EOPNOTSUPP);
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}
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static int
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maxrtc_getcal(struct todr_chip_handle *ch, int *cal)
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{
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return (EOPNOTSUPP);
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}
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/*
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* While the MAX6900 has a nice Clock Burst Read/Write command,
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* we can't use it, since some I2C controllers do not support
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* anything other than single-byte transfers.
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*/
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static int max6900_rtc_offset[] = {
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MAX6900_REG_SECOND,
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MAX6900_REG_MINUTE,
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MAX6900_REG_HOUR,
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MAX6900_REG_DATE,
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MAX6900_REG_MONTH,
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MAX6900_REG_DAY,
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MAX6900_REG_YEAR,
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MAX6900_REG_CENTURY, /* control, if burst */
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};
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static int
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maxrtc_clock_read(struct maxrtc_softc *sc, struct clock_ymdhms *dt)
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{
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u_int8_t bcd[MAX6900_BURST_LEN], cmdbuf[1];
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int i;
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
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printf("%s: maxrtc_clock_read: failed to acquire I2C bus\n",
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sc->sc_dev.dv_xname);
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return (0);
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}
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/* Read each timekeeping register in order. */
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for (i = 0; i < MAX6900_BURST_LEN; i++) {
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cmdbuf[0] = max6900_rtc_offset[i] | MAX6900_CMD_READ;
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if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
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sc->sc_address, cmdbuf, 1,
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&bcd[i], 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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printf("%s: maxrtc_clock_read: failed to read rtc "
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"at 0x%x\n", sc->sc_dev.dv_xname,
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max6900_rtc_offset[i]);
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return (0);
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}
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}
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/* Done with I2C */
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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/*
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* Convert the MAX6900's register values into something useable
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*/
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dt->dt_sec = FROMBCD(bcd[MAX6900_BURST_SECOND] & MAX6900_SECOND_MASK);
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dt->dt_min = FROMBCD(bcd[MAX6900_BURST_MINUTE] & MAX6900_MINUTE_MASK);
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if (bcd[MAX6900_BURST_HOUR] & MAX6900_HOUR_12HRS) {
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dt->dt_hour = FROMBCD(bcd[MAX6900_BURST_HOUR] &
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MAX6900_HOUR_12MASK);
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if (bcd[MAX6900_BURST_HOUR] & MAX6900_HOUR_12HRS_PM)
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dt->dt_hour += 12;
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} else {
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dt->dt_hour = FROMBCD(bcd[MAX6900_BURST_HOUR] &
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MAX6900_HOUR_24MASK);
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}
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dt->dt_day = FROMBCD(bcd[MAX6900_BURST_DATE] & MAX6900_DATE_MASK);
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dt->dt_mon = FROMBCD(bcd[MAX6900_BURST_MONTH] & MAX6900_MONTH_MASK);
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dt->dt_year = FROMBCD(bcd[MAX6900_BURST_YEAR]);
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/* century in the burst control slot */
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dt->dt_year += (int)FROMBCD(bcd[MAX6900_BURST_CONTROL]) * 100;
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return (1);
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}
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static int
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maxrtc_clock_write(struct maxrtc_softc *sc, struct clock_ymdhms *dt)
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{
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uint8_t bcd[MAX6900_BURST_LEN], cmdbuf[2];
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uint8_t init_seconds, final_seconds;
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int i;
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/*
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* Convert our time representation into something the MAX6900
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* can understand.
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*/
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bcd[MAX6900_BURST_SECOND] = TOBCD(dt->dt_sec);
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bcd[MAX6900_BURST_MINUTE] = TOBCD(dt->dt_min);
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bcd[MAX6900_BURST_HOUR] = TOBCD(dt->dt_hour) & MAX6900_HOUR_24MASK;
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bcd[MAX6900_BURST_DATE] = TOBCD(dt->dt_day);
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bcd[MAX6900_BURST_WDAY] = TOBCD(dt->dt_wday);
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bcd[MAX6900_BURST_MONTH] = TOBCD(dt->dt_mon);
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bcd[MAX6900_BURST_YEAR] = TOBCD(dt->dt_year % 100);
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/* century in control slot */
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bcd[MAX6900_BURST_CONTROL] = TOBCD(dt->dt_year / 100);
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
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printf("%s: maxrtc_clock_write: failed to acquire I2C bus\n",
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sc->sc_dev.dv_xname);
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return (0);
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}
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/* Start by clearing the control register's write-protect bit. */
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cmdbuf[0] = MAX6900_REG_CONTROL | MAX6900_CMD_WRITE;
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cmdbuf[1] = 0;
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if (iic_exec(sc->sc_tag, I2C_OP_WRITE, sc->sc_address,
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cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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printf("%s: maxrtc_clock_write: failed to clear WP bit\n",
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sc->sc_dev.dv_xname);
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return (0);
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}
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/*
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* The MAX6900 RTC manual recommends ensuring "atomicity" of
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* a non-burst write by:
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*
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* - writing SECONDS
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* - reading back SECONDS, remembering it as "initial seconds"
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* - write the remaing RTC registers
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* - read back SECONDS as "final seconds"
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* - if "initial seconds" == 59, ensure "final seconds" == 59
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* - else, ensure "final seconds" is no more than one second
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* beyond "initial seconds".
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*/
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again:
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cmdbuf[0] = MAX6900_REG_SECOND | MAX6900_CMD_WRITE;
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if (iic_exec(sc->sc_tag, I2C_OP_WRITE, sc->sc_address,
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cmdbuf, 1, &bcd[MAX6900_BURST_SECOND], 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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printf("%s: maxrtc_clock_write: failed to write SECONDS\n",
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sc->sc_dev.dv_xname);
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return (0);
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}
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cmdbuf[0] = MAX6900_REG_SECOND | MAX6900_CMD_READ;
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if (iic_exec(sc->sc_tag, I2C_OP_READ, sc->sc_address,
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cmdbuf, 1, &init_seconds, 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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printf("%s: maxrtc_clock_write: failed to read "
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"INITIAL SECONDS\n", sc->sc_dev.dv_xname);
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return (0);
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}
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for (i = 1; i < MAX6900_BURST_LEN; i++) {
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cmdbuf[0] = max6900_rtc_offset[i] | MAX6900_CMD_WRITE;
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if (iic_exec(sc->sc_tag,
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i != MAX6900_BURST_LEN - 1 ? I2C_OP_WRITE :
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I2C_OP_WRITE_WITH_STOP, sc->sc_address,
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cmdbuf, 1, &bcd[i], 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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printf("%s: maxrtc_clock_write: failed to write rtc "
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" at 0x%x\n", sc->sc_dev.dv_xname,
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max6900_rtc_offset[i]);
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return (0);
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}
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}
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cmdbuf[0] = MAX6900_REG_SECOND | MAX6900_CMD_READ;
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if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
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cmdbuf, 1, &final_seconds, 1, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
|
|
printf("%s: maxrtc_clock_write: failed to read "
|
|
"FINAL SECONDS\n", sc->sc_dev.dv_xname);
|
|
return (0);
|
|
}
|
|
|
|
if ((init_seconds == 59 && final_seconds != 59) ||
|
|
(init_seconds != 59 && final_seconds != init_seconds + 1)) {
|
|
#if 1
|
|
printf("%s: maxrtc_clock_write: init %d, final %d, try again\n",
|
|
sc->sc_dev.dv_xname, init_seconds, final_seconds);
|
|
#endif
|
|
goto again;
|
|
}
|
|
|
|
/* Finish by setting the control register's write-protect bit. */
|
|
cmdbuf[0] = MAX6900_REG_CONTROL | MAX6900_CMD_WRITE;
|
|
cmdbuf[1] = MAX6900_CONTROL_WP;
|
|
|
|
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
|
|
cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) {
|
|
iic_release_bus(sc->sc_tag, I2C_F_POLL);
|
|
printf("%s: maxrtc_clock_write: failed to set WP bit\n",
|
|
sc->sc_dev.dv_xname);
|
|
return (0);
|
|
}
|
|
|
|
iic_release_bus(sc->sc_tag, I2C_F_POLL);
|
|
|
|
return (1);
|
|
}
|