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    Subject[PATCH] tile: add an RTC driver for the Tilera hypervisor
    This is a simple RTC driver that lets Tilera hardware boot up and
    set the clock correctly.

    Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
    ---
    arch/tile/configs/tile_defconfig | 1 +
    arch/tile/configs/tilegx_defconfig | 63 ++++++++++++++-
    arch/tile/drivers/Makefile | 1 +
    drivers/rtc/Kconfig | 7 ++
    drivers/rtc/Makefile | 1 +
    drivers/rtc/rtc-tile.c | 157 ++++++++++++++++++++++++++++++++++++
    6 files changed, 227 insertions(+), 3 deletions(-)
    create mode 100644 drivers/rtc/rtc-tile.c

    diff --git a/arch/tile/configs/tile_defconfig b/arch/tile/configs/tile_defconfig
    index 041c456..6f7ed60 100644
    --- a/arch/tile/configs/tile_defconfig
    +++ b/arch/tile/configs/tile_defconfig
    @@ -797,6 +797,7 @@ CONFIG_RTC_INTF_DEV=y
    #
    # on-CPU RTC drivers
    #
    +CONFIG_RTC_DRV_TILE=y
    # CONFIG_DMADEVICES is not set
    # CONFIG_AUXDISPLAY is not set
    # CONFIG_UIO is not set
    diff --git a/arch/tile/configs/tilegx_defconfig b/arch/tile/configs/tilegx_defconfig
    index 6343962..88613d4 100644
    --- a/arch/tile/configs/tilegx_defconfig
    +++ b/arch/tile/configs/tilegx_defconfig
    @@ -1136,8 +1136,6 @@ CONFIG_HVC_DRIVER=y
    # CONFIG_IPMI_HANDLER is not set
    CONFIG_HW_RANDOM=y
    CONFIG_HW_RANDOM_TIMERIOMEM=m
    -# CONFIG_RTC is not set
    -# CONFIG_GEN_RTC is not set
    # CONFIG_R3964 is not set
    # CONFIG_APPLICOM is not set

    @@ -1278,7 +1276,66 @@ CONFIG_MFD_SUPPORT=y
    # CONFIG_ACCESSIBILITY is not set
    # CONFIG_INFINIBAND is not set
    # CONFIG_EDAC is not set
    -# CONFIG_RTC_CLASS is not set
    +CONFIG_RTC_LIB=y
    +CONFIG_RTC_CLASS=y
    +CONFIG_RTC_HCTOSYS=y
    +CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
    +# CONFIG_RTC_DEBUG is not set
    +
    +#
    +# RTC interfaces
    +#
    +CONFIG_RTC_INTF_SYSFS=y
    +CONFIG_RTC_INTF_PROC=y
    +CONFIG_RTC_INTF_DEV=y
    +# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
    +# CONFIG_RTC_DRV_TEST is not set
    +
    +#
    +# I2C RTC drivers
    +#
    +# CONFIG_RTC_DRV_DS1307 is not set
    +# CONFIG_RTC_DRV_DS1374 is not set
    +# CONFIG_RTC_DRV_DS1672 is not set
    +# CONFIG_RTC_DRV_DS3232 is not set
    +# CONFIG_RTC_DRV_MAX6900 is not set
    +# CONFIG_RTC_DRV_RS5C372 is not set
    +# CONFIG_RTC_DRV_ISL1208 is not set
    +# CONFIG_RTC_DRV_ISL12022 is not set
    +# CONFIG_RTC_DRV_X1205 is not set
    +# CONFIG_RTC_DRV_PCF8563 is not set
    +# CONFIG_RTC_DRV_PCF8583 is not set
    +# CONFIG_RTC_DRV_M41T80 is not set
    +# CONFIG_RTC_DRV_BQ32K is not set
    +# CONFIG_RTC_DRV_S35390A is not set
    +# CONFIG_RTC_DRV_FM3130 is not set
    +# CONFIG_RTC_DRV_RX8581 is not set
    +# CONFIG_RTC_DRV_RX8025 is not set
    +
    +#
    +# SPI RTC drivers
    +#
    +
    +#
    +# Platform RTC drivers
    +#
    +# CONFIG_RTC_DRV_DS1286 is not set
    +# CONFIG_RTC_DRV_DS1511 is not set
    +# CONFIG_RTC_DRV_DS1553 is not set
    +# CONFIG_RTC_DRV_DS1742 is not set
    +# CONFIG_RTC_DRV_STK17TA8 is not set
    +# CONFIG_RTC_DRV_M48T86 is not set
    +# CONFIG_RTC_DRV_M48T35 is not set
    +# CONFIG_RTC_DRV_M48T59 is not set
    +# CONFIG_RTC_DRV_MSM6242 is not set
    +# CONFIG_RTC_DRV_BQ4802 is not set
    +# CONFIG_RTC_DRV_RP5C01 is not set
    +# CONFIG_RTC_DRV_V3020 is not set
    +
    +#
    +# on-CPU RTC drivers
    +#
    +CONFIG_RTC_DRV_TILE=y
    # CONFIG_DMADEVICES is not set
    # CONFIG_AUXDISPLAY is not set
    # CONFIG_UIO is not set
    diff --git a/arch/tile/drivers/Makefile b/arch/tile/drivers/Makefile
    index 311e741..30c5de0 100644
    --- a/arch/tile/drivers/Makefile
    +++ b/arch/tile/drivers/Makefile
    @@ -7,6 +7,7 @@
    #
    # drivers/net/tile/ network
    # drivers/tty/hvc/hvc_tile.c hypervisor console
    +# drivers/rtc/rtc-tile.c RTC driver
    # drivers/edac/tile_edac.c EDAC driver
    #

    diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
    index e187887..d2c615f 100644
    --- a/drivers/rtc/Kconfig
    +++ b/drivers/rtc/Kconfig
    @@ -995,4 +995,11 @@ config RTC_DRV_TEGRA
    This drive can also be built as a module. If so, the module
    will be called rtc-tegra.

    +config RTC_DRV_TILE
    + tristate "Tilera hypervisor RTC support"
    + depends on TILE
    + help
    + Enable support for the Linux driver side of the Tilera
    + hypervisor's real-time clock interface.
    +
    endif # RTC_CLASS
    diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
    index ca91c3c..9574748 100644
    --- a/drivers/rtc/Makefile
    +++ b/drivers/rtc/Makefile
    @@ -93,6 +93,7 @@ obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
    obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
    obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o
    obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
    +obj-$(CONFIG_RTC_DRV_TILE) += rtc-tile.o
    obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o
    obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o
    obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
    diff --git a/drivers/rtc/rtc-tile.c b/drivers/rtc/rtc-tile.c
    new file mode 100644
    index 0000000..27c205e
    --- /dev/null
    +++ b/drivers/rtc/rtc-tile.c
    @@ -0,0 +1,157 @@
    +/*
    + * Copyright 2011 Tilera Corporation. All Rights Reserved.
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation, version 2.
    + *
    + * This program is distributed in the hope that it will be useful, but
    + * WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
    + * NON INFRINGEMENT. See the GNU General Public License for
    + * more details.
    + *
    + * Tilera-specific RTC driver.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/device.h>
    +#include <linux/rtc.h>
    +#include <linux/platform_device.h>
    +
    +/* Platform device pointer. */
    +static struct platform_device *tile_rtc_platform_device;
    +
    +/*
    + * RTC read routine. Gets time info from RTC chip via hypervisor syscall.
    + */
    +static int read_rtc_time(struct device *dev, struct rtc_time *tm)
    +{
    + HV_RTCTime hvtm = hv_get_rtc();
    +
    + tm->tm_sec = hvtm.tm_sec;
    + tm->tm_min = hvtm.tm_min;
    + tm->tm_hour = hvtm.tm_hour;
    + tm->tm_mday = hvtm.tm_mday;
    + tm->tm_mon = hvtm.tm_mon;
    + tm->tm_year = hvtm.tm_year;
    + tm->tm_wday = 0;
    + tm->tm_yday = 0;
    + tm->tm_isdst = 0;
    +
    + if (rtc_valid_tm(tm) < 0)
    + dev_warn(dev, "Read invalid date/time from RTC\n");
    +
    + return 0;
    +}
    +
    +/*
    + * RTC write routine. Sends time info to hypervisor via syscall, to be
    + * written to RTC chip.
    + */
    +static int set_rtc_time(struct device *dev, struct rtc_time *tm)
    +{
    + HV_RTCTime hvtm;
    +
    + hvtm.tm_sec = tm->tm_sec;
    + hvtm.tm_min = tm->tm_min;
    + hvtm.tm_hour = tm->tm_hour;
    + hvtm.tm_mday = tm->tm_mday;
    + hvtm.tm_mon = tm->tm_mon;
    + hvtm.tm_year = tm->tm_year;
    +
    + hv_set_rtc(hvtm);
    +
    + return 0;
    +}
    +
    +/*
    + * RTC read/write ops.
    + */
    +static const struct rtc_class_ops tile_rtc_ops = {
    + .read_time = read_rtc_time,
    + .set_time = set_rtc_time,
    +};
    +
    +/*
    + * Device probe routine.
    + */
    +static int __devinit tile_rtc_probe(struct platform_device *dev)
    +{
    + struct rtc_device *rtc;
    +
    + rtc = rtc_device_register("tile",
    + &dev->dev, &tile_rtc_ops, THIS_MODULE);
    +
    + if (IS_ERR(rtc))
    + return PTR_ERR(rtc);
    +
    + platform_set_drvdata(dev, rtc);
    +
    + return 0;
    +}
    +
    +/*
    + * Device cleanup routine.
    + */
    +static int __devexit tile_rtc_remove(struct platform_device *dev)
    +{
    + struct rtc_device *rtc = platform_get_drvdata(dev);
    +
    + if (rtc)
    + rtc_device_unregister(rtc);
    +
    + platform_set_drvdata(dev, NULL);
    +
    + return 0;
    +}
    +
    +static struct platform_driver tile_rtc_platform_driver = {
    + .driver = {
    + .name = "rtc-tile",
    + .owner = THIS_MODULE,
    + },
    + .probe = tile_rtc_probe,
    + .remove = __devexit_p(tile_rtc_remove),
    +};
    +
    +/*
    + * Driver init routine.
    + */
    +static int __init tile_rtc_driver_init(void)
    +{
    + int err;
    +
    + err = platform_driver_register(&tile_rtc_platform_driver);
    + if (err)
    + return err;
    +
    + tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
    + if (tile_rtc_platform_device == NULL) {
    + platform_driver_unregister(&tile_rtc_platform_driver);
    + return -ENOMEM;
    + }
    +
    + err = platform_device_add(tile_rtc_platform_device);
    + if (err) {
    + platform_device_put(tile_rtc_platform_device);
    + return err;
    + }
    +
    + return 0;
    +}
    +
    +/*
    + * Driver cleanup routine.
    + */
    +static void __exit tile_rtc_driver_exit(void)
    +{
    + platform_driver_unregister(&tile_rtc_platform_driver);
    +}
    +
    +module_init(tile_rtc_driver_init);
    +module_exit(tile_rtc_driver_exit);
    +
    +MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
    +MODULE_LICENSE("GPL");
    +MODULE_ALIAS("platform:rtc-tile");
    --
    1.6.5.2


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