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.

Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2011-05-09 13:28:43 -04:00
parent 18aecc2b64
commit dd196a2b3d
5 changed files with 231 additions and 3 deletions

View file

@ -796,6 +796,7 @@ 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

View file

@ -1135,8 +1135,6 @@ 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
@ -1277,7 +1275,66 @@ 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

View file

@ -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

View file

@ -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

162
drivers/rtc/rtc-tile.c Normal file
View file

@ -0,0 +1,162 @@
/*
* 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) {
err = -ENOMEM;
goto exit_driver_unregister;
}
err = platform_device_add(tile_rtc_platform_device);
if (err)
goto exit_device_put;
return 0;
exit_device_put:
platform_device_put(tile_rtc_platform_device);
exit_driver_unregister:
platform_driver_unregister(&tile_rtc_platform_driver);
return err;
}
/*
* 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");