Author: mw Date: Mon May 25 15:40:02 2020 New Revision: 361463 URL: https://svnweb.freebsd.org/changeset/base/361463
Log: Introduce support for Epson RX-8803 RTC. This patch introduces support for Epson RX-8803 RTC controller accessible over I2C bus. It has a resolution of 1 sec. Support for interrupt based alarm was not implemented. Submitted by: Kornel Duleba <min...@semihalf.com> Reviewed by: manu Obtained from: Semihalf Sponsored by: Alstom Group Differential Revision: https://reviews.freebsd.org/D24364 Added: head/sys/dev/iicbus/rtc/ head/sys/dev/iicbus/rtc/rx8803.c (contents, props changed) head/sys/modules/i2c/rx8803/ head/sys/modules/i2c/rx8803/Makefile (contents, props changed) Modified: head/sys/conf/files head/sys/modules/i2c/Makefile Modified: head/sys/conf/files ============================================================================== --- head/sys/conf/files Mon May 25 15:31:43 2020 (r361462) +++ head/sys/conf/files Mon May 25 15:40:02 2020 (r361463) @@ -1804,6 +1804,7 @@ dev/iicbus/mux/ltc430x.c optional ltc430x dev/iicbus/nxprtc.c optional nxprtc | pcf8563 dev/iicbus/ofw_iicbus.c optional fdt iicbus dev/iicbus/rtc8583.c optional rtc8583 +dev/iicbus/rtc/rx8803.c optional rx8803 iicbus fdt dev/iicbus/s35390a.c optional s35390a dev/iicbus/sy8106a.c optional sy8106a ext_resources fdt dev/iicbus/gpio/tca6416.c optional tca6416 fdt Added: head/sys/dev/iicbus/rtc/rx8803.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/iicbus/rtc/rx8803.c Mon May 25 15:40:02 2020 (r361463) @@ -0,0 +1,246 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 2020 Alstom Group. + * Copyright (c) 2020 Semihalf. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/clock.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <dev/iicbus/iiconf.h> +#include <dev/iicbus/iicbus.h> + +#include "clock_if.h" +#include "iicbus_if.h" + +#define BIT(x) (1 << (x)) + +#define RX8803_TIME 0x0 +#define RX8803_FLAGS 0xE +#define RX8803_CTRL 0xF + +#define RX8803_FLAGS_V1F BIT(0) +#define RX8803_FLAGS_V2F BIT(1) + +#define RX8803_CTRL_DISABLE BIT(0) + +#define HALF_OF_SEC_NS 500000000 +#define MAX_WRITE_LEN 16 + +struct rx8803_time { + uint8_t sec; + uint8_t min; + uint8_t hour; + uint8_t dow; + uint8_t day; + uint8_t mon; + uint8_t year; +}; + +static int rx8803_probe(device_t dev); +static int rx8803_attach(device_t dev); +static int rx8803_detach(device_t dev); + +static int rx8803_gettime(device_t dev, struct timespec *ts); +static int rx8803_settime(device_t dev, struct timespec *ts); + +static int rx8803_check_status(device_t dev); + +static int +rx8803_check_status(device_t dev) +{ + uint8_t flags; + int rc; + + rc = iicdev_readfrom(dev, RX8803_FLAGS, &flags, 1, IIC_WAIT); + if (rc != 0) + return (rc); + + if (flags & RX8803_FLAGS_V2F) { + device_printf(dev, "Low voltage flag set, date is incorrect\n"); + return (ENXIO); + } + + return (0); +} + +static int +rx8803_gettime(device_t dev, struct timespec *ts) +{ + struct rx8803_time data; + struct bcd_clocktime bcd; + int rc; + + rc = rx8803_check_status(dev); + if (rc != 0) + return (rc); + + rc = iicdev_readfrom(dev, + RX8803_TIME, + &data, sizeof(struct rx8803_time), + IIC_WAIT); + if (rc != 0) + return (rc); + + bcd.nsec = 0; + bcd.sec = data.sec & 0x7F; + bcd.min = data.min & 0x7F; + bcd.hour = data.hour & 0x3F; + bcd.dow = flsl(data.dow & 0x7F) - 1; + bcd.day = data.day & 0x3F; + bcd.mon = (data.mon & 0x1F); + bcd.year = data.year; + + clock_dbgprint_bcd(dev, CLOCK_DBG_READ, &bcd); + + rc = clock_bcd_to_ts(&bcd, ts, false); + return (rc); +} + +static int +rx8803_settime(device_t dev, struct timespec *ts) +{ + struct rx8803_time data; + struct bcd_clocktime bcd; + device_t bus; + uint8_t reg; + int rc; + + bus = device_get_parent(dev); + + ts->tv_sec -= utc_offset(); + clock_ts_to_bcd(ts, &bcd, false); + clock_dbgprint_bcd(dev, CLOCK_DBG_WRITE, &bcd); + + data.sec = bcd.sec; + data.min = bcd.min; + data.hour = bcd.hour; + data.dow = 1 << bcd.dow; + data.day = bcd.day; + data.mon = bcd.mon; + data.year = bcd.year; + + if (ts->tv_nsec > HALF_OF_SEC_NS) + data.sec++; + + /* First disable clock. */ + rc = iicdev_readfrom(dev, RX8803_CTRL, ®, sizeof(uint8_t), IIC_WAIT); + if (rc != 0) + return (rc); + + reg |= RX8803_CTRL_DISABLE; + + rc = iicdev_writeto(dev, RX8803_CTRL, ®, sizeof(uint8_t), IIC_WAIT); + if (rc != 0) + return (rc); + + /* Update the date. */ + rc = iicdev_writeto(dev, + RX8803_TIME, + &data, sizeof(struct rx8803_time), + IIC_WAIT); + if (rc != 0) + return (rc); + + /* Now restart it. */ + reg &= ~RX8803_CTRL_DISABLE; + rc = iicdev_writeto(dev, RX8803_CTRL, ®, sizeof(uint8_t), IIC_WAIT); + if (rc != 0) + return (rc); + + /* Clear low voltage flags, as we have just updated the clock. */ + rc = iicdev_readfrom(dev, RX8803_FLAGS, ®, sizeof(uint8_t), IIC_WAIT); + if (rc != 0) + return (rc); + + reg &= ~(RX8803_FLAGS_V1F | RX8803_FLAGS_V2F); + rc = iicdev_writeto(dev, RX8803_FLAGS, ®, sizeof(uint8_t), IIC_WAIT); + return (rc); +} + +static int +rx8803_probe(device_t dev) +{ + + if (!ofw_bus_is_compatible(dev, "epson,rx8803")) + return (ENXIO); + + device_set_desc(dev, "Epson RX8803 Real Time Clock"); + + return (BUS_PROBE_GENERIC); +} + +static int +rx8803_attach(device_t dev) +{ + + /* Set 1 sec resolution. */ + clock_register_flags(dev, 1000000, 0); + clock_schedule(dev, 1); + + return (0); + +} + +static int +rx8803_detach(device_t dev) +{ + + clock_unregister(dev); + + return (0); +} + +static device_method_t rx8803_methods[] = { + DEVMETHOD(device_probe, rx8803_probe), + DEVMETHOD(device_attach, rx8803_attach), + DEVMETHOD(device_detach, rx8803_detach), + + DEVMETHOD(clock_gettime, rx8803_gettime), + DEVMETHOD(clock_settime, rx8803_settime), + + DEVMETHOD_END, +}; + +static driver_t rx8803_driver = { + "rx8803", + rx8803_methods, + 0, /* We don't need softc for this one. */ +}; + +static devclass_t rx8803_devclass; + +DRIVER_MODULE(rx8803, iicbus, rx8803_driver, rx8803_devclass, NULL, NULL); +MODULE_DEPEND(rx8803, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); Modified: head/sys/modules/i2c/Makefile ============================================================================== --- head/sys/modules/i2c/Makefile Mon May 25 15:31:43 2020 (r361462) +++ head/sys/modules/i2c/Makefile Mon May 25 15:40:02 2020 (r361463) @@ -25,7 +25,8 @@ SUBDIR = \ smbus \ .if !empty(OPT_FDT) -SUBDIR += tca6416 +SUBDIR += tca6416 \ + rx8803 .endif .include <bsd.subdir.mk> Added: head/sys/modules/i2c/rx8803/Makefile ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/modules/i2c/rx8803/Makefile Mon May 25 15:40:02 2020 (r361463) @@ -0,0 +1,16 @@ +# $FreeBSD$ + +.PATH: ${SRCTOP}/sys/dev/iicbus/rtc/ +KMOD = rx8803 +SRCS = rx8803.c + +# Generated files... +SRCS+= \ + bus_if.h \ + clock_if.h \ + device_if.h \ + iicbus_if.h \ + opt_platform.h \ + ofw_bus_if.h \ + +.include <bsd.kmod.mk> _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
