Author: jmcneill Date: Sun Feb 28 17:42:27 2016 New Revision: 296161 URL: https://svnweb.freebsd.org/changeset/base/296161
Log: Add Allwinner A10/A20 RTC driver. Submitted by: Vladimir Belian <fat...@gmail.com> Reviewed by: andrew, imp, jmcneill Approved by: gonzo (mentor) Differential Revision: https://reviews.freebsd.org/D5414 Added: head/sys/arm/allwinner/aw_rtc.c (contents, props changed) Modified: head/sys/arm/allwinner/files.allwinner Added: head/sys/arm/allwinner/aw_rtc.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/arm/allwinner/aw_rtc.c Sun Feb 28 17:42:27 2016 (r296161) @@ -0,0 +1,272 @@ +/*- + * Copyright (c) 2016 Vladimir Belian <fat...@gmail.com> + * All rights reserved. + * + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/bus.h> +#include <sys/time.h> +#include <sys/rman.h> +#include <sys/clock.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/resource.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/allwinner/allwinner_machdep.h> + +#include "clock_if.h" + +#define LOSC_CTRL_REG 0x00 +#define RTC_DATE_REG 0x04 +#define RTC_TIME_REG 0x08 + +#define TIME_MASK 0x001f3f3f + +#define LOSC_OSC_SRC 0x00000001 +#define LOSC_GSM 0x00000008 +#define LOSC_AUTO_SW_EN 0x00004000 +#define LOSC_MAGIC 0x16aa0000 +#define LOSC_BUSY_MASK 0x00000380 + +#define IS_SUN7I (allwinner_soc_family() == ALLWINNERSOC_SUN7I) + +#define YEAR_MIN (IS_SUN7I ? 1970 : 2010) +#define YEAR_MAX (IS_SUN7I ? 2100 : 2073) +#define YEAR_OFFSET (IS_SUN7I ? 1900 : 2010) +#define YEAR_MASK (IS_SUN7I ? 0xff : 0x3f) +#define LEAP_BIT (IS_SUN7I ? 24 : 22) + +#define GET_SEC_VALUE(x) ((x) & 0x0000003f) +#define GET_MIN_VALUE(x) (((x) & 0x00003f00) >> 8) +#define GET_HOUR_VALUE(x) (((x) & 0x001f0000) >> 16) +#define GET_DAY_VALUE(x) ((x) & 0x0000001f) +#define GET_MON_VALUE(x) (((x) & 0x00000f00) >> 8) +#define GET_YEAR_VALUE(x) (((x) >> 16) & YEAR_MASK) + +#define SET_DAY_VALUE(x) GET_DAY_VALUE(x) +#define SET_MON_VALUE(x) (((x) & 0x0000000f) << 8) +#define SET_YEAR_VALUE(x) (((x) & YEAR_MASK) << 16) +#define SET_LEAP_VALUE(x) (((x) & 0x00000001) << LEAP_BIT) +#define SET_SEC_VALUE(x) GET_SEC_VALUE(x) +#define SET_MIN_VALUE(x) (((x) & 0x0000003f) << 8) +#define SET_HOUR_VALUE(x) (((x) & 0x0000001f) << 16) + +#define HALF_OF_SEC_NS 500000000 +#define RTC_RES_US 1000000 +#define RTC_TIMEOUT 70 + +#define RTC_READ(sc, reg) bus_read_4((sc)->res, (reg)) +#define RTC_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) + +#define IS_LEAP_YEAR(y) \ + (((y) % 400) == 0 || (((y) % 100) != 0 && ((y) % 4) == 0)) + + +static struct ofw_compat_data compat_data[] = { + { "allwinner,sun4i-a10-rtc", true }, + { "allwinner,sun7i-a20-rtc", true }, + { NULL, false } +}; + +struct aw_rtc_softc { + struct resource *res; +}; + +static int aw_rtc_probe(device_t dev); +static int aw_rtc_attach(device_t dev); +static int aw_rtc_detach(device_t dev); + +static int aw_rtc_gettime(device_t dev, struct timespec *ts); +static int aw_rtc_settime(device_t dev, struct timespec *ts); + +static device_method_t aw_rtc_methods[] = { + DEVMETHOD(device_probe, aw_rtc_probe), + DEVMETHOD(device_attach, aw_rtc_attach), + DEVMETHOD(device_detach, aw_rtc_detach), + + DEVMETHOD(clock_gettime, aw_rtc_gettime), + DEVMETHOD(clock_settime, aw_rtc_settime), + + DEVMETHOD_END +}; + +static driver_t aw_rtc_driver = { + "rtc", + aw_rtc_methods, + sizeof(struct aw_rtc_softc), +}; + +static devclass_t aw_rtc_devclass; + +EARLY_DRIVER_MODULE(aw_rtc, simplebus, aw_rtc_driver, aw_rtc_devclass, 0, 0, + BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE); + + +static int +aw_rtc_probe(device_t dev) +{ + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data) + return (ENXIO); + + device_set_desc(dev, "Allwinner RTC"); + + return (BUS_PROBE_DEFAULT); +} + +static int +aw_rtc_attach(device_t dev) +{ + struct aw_rtc_softc *sc = device_get_softc(dev); + uint32_t val; + int rid = 0; + + sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); + if (!sc->res) { + device_printf(dev, "could not allocate resources\n"); + return (ENXIO); + } + + val = RTC_READ(sc, LOSC_CTRL_REG); + val &= ~LOSC_AUTO_SW_EN; + val |= LOSC_MAGIC | LOSC_GSM | LOSC_OSC_SRC; + RTC_WRITE(sc, LOSC_CTRL_REG, val); + + DELAY(100); + + val = RTC_READ(sc, LOSC_CTRL_REG); + if ((val & LOSC_OSC_SRC) == 0) { + bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res); + device_printf(dev, "set LOSC to external failed\n"); + return (ENXIO); + } + + clock_register(dev, RTC_RES_US); + + return (0); +} + +static int +aw_rtc_detach(device_t dev) +{ + /* can't support detach, since there's no clock_unregister function */ + return (EBUSY); +} + +static int +aw_rtc_gettime(device_t dev, struct timespec *ts) +{ + struct aw_rtc_softc *sc = device_get_softc(dev); + struct clocktime ct; + uint32_t rdate, rtime; + + rdate = RTC_READ(sc, RTC_DATE_REG); + rtime = RTC_READ(sc, RTC_TIME_REG); + + if ((rtime & TIME_MASK) == 0) + rdate = RTC_READ(sc, RTC_DATE_REG); + + ct.sec = GET_SEC_VALUE(rtime); + ct.min = GET_MIN_VALUE(rtime); + ct.hour = GET_HOUR_VALUE(rtime); + ct.day = GET_DAY_VALUE(rdate); + ct.mon = GET_MON_VALUE(rdate); + ct.year = GET_YEAR_VALUE(rdate) + YEAR_OFFSET; + ct.dow = -1; + /* RTC resolution is 1 sec */ + ct.nsec = 0; + + return (clock_ct_to_ts(&ct, ts)); +} + +static int +aw_rtc_settime(device_t dev, struct timespec *ts) +{ + struct aw_rtc_softc *sc = device_get_softc(dev); + struct clocktime ct; + uint32_t clk, rdate, rtime; + + /* RTC resolution is 1 sec */ + if (ts->tv_nsec >= HALF_OF_SEC_NS) + ts->tv_sec++; + ts->tv_nsec = 0; + + clock_ts_to_ct(ts, &ct); + + if ((ct.year < YEAR_MIN) || (ct.year > YEAR_MAX)) { + device_printf(dev, "could not set time, year out of range\n"); + return (EINVAL); + } + + for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) { + if (clk > RTC_TIMEOUT) { + device_printf(dev, "could not set time, RTC busy\n"); + return (EINVAL); + } + DELAY(1); + } + /* reset time register to avoid unexpected date increment */ + RTC_WRITE(sc, RTC_TIME_REG, 0); + + rdate = SET_DAY_VALUE(ct.day) | SET_MON_VALUE(ct.mon) | + SET_YEAR_VALUE(ct.year - YEAR_OFFSET) | + SET_LEAP_VALUE(IS_LEAP_YEAR(ct.year)); + + rtime = SET_SEC_VALUE(ct.sec) | SET_MIN_VALUE(ct.min) | + SET_HOUR_VALUE(ct.hour); + + for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) { + if (clk > RTC_TIMEOUT) { + device_printf(dev, "could not set date, RTC busy\n"); + return (EINVAL); + } + DELAY(1); + } + RTC_WRITE(sc, RTC_DATE_REG, rdate); + + for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) { + if (clk > RTC_TIMEOUT) { + device_printf(dev, "could not set time, RTC busy\n"); + return (EINVAL); + } + DELAY(1); + } + RTC_WRITE(sc, RTC_TIME_REG, rtime); + + DELAY(RTC_TIMEOUT); + + return (0); +} Modified: head/sys/arm/allwinner/files.allwinner ============================================================================== --- head/sys/arm/allwinner/files.allwinner Sun Feb 28 16:21:53 2016 (r296160) +++ head/sys/arm/allwinner/files.allwinner Sun Feb 28 17:42:27 2016 (r296161) @@ -10,6 +10,7 @@ arm/allwinner/a10_ehci.c optional ehci arm/allwinner/a10_gpio.c optional gpio arm/allwinner/a10_mmc.c optional mmc arm/allwinner/a10_sramc.c standard +arm/allwinner/aw_rtc.c standard arm/allwinner/aw_wdog.c standard arm/allwinner/a20/a20_cpu_cfg.c standard arm/allwinner/allwinner_machdep.c standard _______________________________________________ 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"
