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Commit dd196a2b authored by Chris Metcalf's avatar Chris Metcalf
Browse files

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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent 18aecc2b

arch/tile/configs/tile_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/tile/configs/tilegx_defconfig

+60 −3
Original line number Diff line number Diff line
@@ -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

drivers/rtc/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -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

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/rtc/rtc-tile.c

0 → 100644
+162 −0
Original line number Diff line number Diff line 
/*

 * 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");