4cdf854f7d
AT91sam9 RTC support, primarily in the form of an RTT-as-RTC driver that was
extracted from 2.6.23-at91 patch and updated:
- Relies on now-merged platform updates, which associate the RTT
hardware address with each RTT and use the "at91_rtt" name.
- RTC framework related fixes and cleanups, notably:
* removed now-needless suspend/resume clock offset logic
* alarm read/write now respects the "enabled" flag
* suspend always disables update irqs
* shutdown (and startup) disables all irqs
- Misc cleanup:
* use dev_*() messaging
* add comments
* remove globals,
* ... etc
- Don't force use of RTT0 and GPBR0. Either resource may need
to be used for other purposes (like NO_HZ support).
- Update "AT91RM9200 RTC" Kconfig to allow it on SAM9RL chips
(it has both RTT and RTC).
Driver binding uses bus_find_device() to avoid needing any kind of "timer
library" code when there's more than one RTT module. (This timer can be used
as an RTC, to support NO_HZ operation, or potentially for other stuff. The
choice is a per-system policy.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Michel Benoit <murpme@gmail.com>
Cc: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
530 lines
16 KiB
Text
530 lines
16 KiB
Text
#
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# RTC class/drivers configuration
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#
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config RTC_LIB
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tristate
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menuconfig RTC_CLASS
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tristate "Real Time Clock"
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default n
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depends on !S390
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select RTC_LIB
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help
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Generic RTC class support. If you say yes here, you will
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be allowed to plug one or more RTCs to your system. You will
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probably want to enable one or more of the interfaces below.
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This driver can also be built as a module. If so, the module
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will be called rtc-class.
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if RTC_CLASS
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if GEN_RTC || RTC
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comment "Conflicting RTC option has been selected, check GEN_RTC and RTC"
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endif
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config RTC_HCTOSYS
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bool "Set system time from RTC on startup and resume"
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depends on RTC_CLASS = y
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default y
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help
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If you say yes here, the system time (wall clock) will be set using
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the value read from a specified RTC device. This is useful to avoid
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unnecessary fsck runs at boot time, and to network better.
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config RTC_HCTOSYS_DEVICE
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string "RTC used to set the system time"
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depends on RTC_HCTOSYS = y
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default "rtc0"
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help
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The RTC device that will be used to (re)initialize the system
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clock, usually rtc0. Initialization is done when the system
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starts up, and when it resumes from a low power state. This
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device should record time in UTC, since the kernel won't do
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timezone correction.
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The driver for this RTC device must be loaded before late_initcall
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functions run, so it must usually be statically linked.
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This clock should be battery-backed, so that it reads the correct
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time when the system boots from a power-off state. Otherwise, your
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system will need an external clock source (like an NTP server).
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If the clock you specify here is not battery backed, it may still
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be useful to reinitialize system time when resuming from system
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sleep states. Do not specify an RTC here unless it stays powered
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during all this system's supported sleep states.
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config RTC_DEBUG
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bool "RTC debug support"
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depends on RTC_CLASS = y
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help
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Say yes here to enable debugging support in the RTC framework
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and individual RTC drivers.
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comment "RTC interfaces"
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config RTC_INTF_SYSFS
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boolean "/sys/class/rtc/rtcN (sysfs)"
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depends on SYSFS
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default RTC_CLASS
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help
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Say yes here if you want to use your RTCs using sysfs interfaces,
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/sys/class/rtc/rtc0 through /sys/.../rtcN.
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This driver can also be built as a module. If so, the module
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will be called rtc-sysfs.
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config RTC_INTF_PROC
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boolean "/proc/driver/rtc (procfs for rtc0)"
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depends on PROC_FS
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default RTC_CLASS
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help
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Say yes here if you want to use your first RTC through the proc
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interface, /proc/driver/rtc. Other RTCs will not be available
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through that API.
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This driver can also be built as a module. If so, the module
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will be called rtc-proc.
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config RTC_INTF_DEV
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boolean "/dev/rtcN (character devices)"
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default RTC_CLASS
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help
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Say yes here if you want to use your RTCs using the /dev
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interfaces, which "udev" sets up as /dev/rtc0 through
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/dev/rtcN. You may want to set up a symbolic link so one
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of these can be accessed as /dev/rtc, which is a name
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expected by "hwclock" and some other programs.
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This driver can also be built as a module. If so, the module
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will be called rtc-dev.
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config RTC_INTF_DEV_UIE_EMUL
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bool "RTC UIE emulation on dev interface"
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depends on RTC_INTF_DEV
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help
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Provides an emulation for RTC_UIE if the underlying rtc chip
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driver does not expose RTC_UIE ioctls. Those requests generate
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once-per-second update interrupts, used for synchronization.
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config RTC_DRV_TEST
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tristate "Test driver/device"
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help
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If you say yes here you get support for the
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RTC test driver. It's a software RTC which can be
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used to test the RTC subsystem APIs. It gets
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the time from the system clock.
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You want this driver only if you are doing development
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on the RTC subsystem. Please read the source code
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for further details.
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This driver can also be built as a module. If so, the module
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will be called rtc-test.
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comment "I2C RTC drivers"
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depends on I2C
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if I2C
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config RTC_DRV_DS1307
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tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
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help
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If you say yes here you get support for various compatible RTC
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chips (often with battery backup) connected with I2C. This driver
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should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
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and probably other chips. In some cases the RTC must already
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have been initialized (by manufacturing or a bootloader).
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The first seven registers on these chips hold an RTC, and other
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registers may add features such as NVRAM, a trickle charger for
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the RTC/NVRAM backup power, and alarms. NVRAM is visible in
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sysfs, but other chip features may not be available.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1307.
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config RTC_DRV_DS1374
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tristate "Dallas/Maxim DS1374"
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depends on RTC_CLASS && I2C
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help
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If you say yes here you get support for Dallas Semiconductor
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DS1374 real-time clock chips. If an interrupt is associated
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with the device, the alarm functionality is supported.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1374.
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config RTC_DRV_DS1672
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tristate "Dallas/Maxim DS1672"
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help
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If you say yes here you get support for the
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Dallas/Maxim DS1672 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1672.
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config RTC_DRV_MAX6900
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tristate "Maxim MAX6900"
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help
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If you say yes here you will get support for the
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Maxim MAX6900 I2C RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-max6900.
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config RTC_DRV_RS5C372
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tristate "Ricoh RS5C372A/B, RV5C386, RV5C387A"
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help
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If you say yes here you get support for the
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Ricoh RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-rs5c372.
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config RTC_DRV_ISL1208
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tristate "Intersil ISL1208"
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help
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If you say yes here you get support for the
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Intersil ISL1208 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-isl1208.
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config RTC_DRV_X1205
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tristate "Xicor/Intersil X1205"
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help
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If you say yes here you get support for the
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Xicor/Intersil X1205 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-x1205.
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config RTC_DRV_PCF8563
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tristate "Philips PCF8563/Epson RTC8564"
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help
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If you say yes here you get support for the
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Philips PCF8563 RTC chip. The Epson RTC8564
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should work as well.
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This driver can also be built as a module. If so, the module
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will be called rtc-pcf8563.
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config RTC_DRV_PCF8583
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tristate "Philips PCF8583"
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help
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If you say yes here you get support for the Philips PCF8583
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RTC chip found on Acorn RiscPCs. This driver supports the
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platform specific method of retrieving the current year from
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the RTC's SRAM. It will work on other platforms with the same
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chip, but the year will probably have to be tweaked.
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This driver can also be built as a module. If so, the module
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will be called rtc-pcf8583.
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config RTC_DRV_M41T80
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tristate "ST M41T80/81/82/83/84/85/87"
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help
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If you say Y here you will get support for the
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ST M41T80 RTC chips series. Currently following chips are
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supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
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and M41ST87.
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This driver can also be built as a module. If so, the module
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will be called rtc-m41t80.
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config RTC_DRV_M41T80_WDT
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bool "ST M41T80 series RTC watchdog timer"
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depends on RTC_DRV_M41T80
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help
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If you say Y here you will get support for the
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watchdog timer in ST M41T80 RTC chips series.
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config RTC_DRV_TWL92330
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boolean "TI TWL92330/Menelaus"
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depends on MENELAUS
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help
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If you say yes here you get support for the RTC on the
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TWL92330 "Menelaus" power management chip, used with OMAP2
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platforms. The support is integrated with the rest of
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the Menelaus driver; it's not separate module.
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endif # I2C
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comment "SPI RTC drivers"
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if SPI_MASTER
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config RTC_DRV_MAX6902
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tristate "Maxim MAX6902"
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help
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If you say yes here you will get support for the
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Maxim MAX6902 SPI RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-max6902.
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config RTC_DRV_R9701
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tristate "Epson RTC-9701JE"
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help
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If you say yes here you will get support for the
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Epson RTC-9701JE SPI RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-r9701.
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config RTC_DRV_RS5C348
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tristate "Ricoh RS5C348A/B"
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help
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If you say yes here you get support for the
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Ricoh RS5C348A and RS5C348B RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-rs5c348.
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endif # SPI_MASTER
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comment "Platform RTC drivers"
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# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
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# requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
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# global rtc_lock ... it's not yet just another platform_device.
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config RTC_DRV_CMOS
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tristate "PC-style 'CMOS'"
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depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
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help
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Say "yes" here to get direct support for the real time clock
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found in every PC or ACPI-based system, and some other boards.
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Specifically the original MC146818, compatibles like those in
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PC south bridges, the DS12887 or M48T86, some multifunction
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or LPC bus chips, and so on.
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Your system will need to define the platform device used by
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this driver, otherwise it won't be accessible. This means
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you can safely enable this driver if you don't know whether
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or not your board has this kind of hardware.
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This driver can also be built as a module. If so, the module
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will be called rtc-cmos.
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config RTC_DRV_DS1216
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tristate "Dallas DS1216"
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depends on SNI_RM
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help
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If you say yes here you get support for the Dallas DS1216 RTC chips.
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config RTC_DRV_DS1302
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tristate "Dallas DS1302"
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depends on SH_SECUREEDGE5410
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help
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If you say yes here you get support for the Dallas DS1302 RTC chips.
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config RTC_DRV_DS1511
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tristate "Dallas DS1511"
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depends on RTC_CLASS
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help
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If you say yes here you get support for the
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Dallas DS1511 timekeeping/watchdog chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1511.
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config RTC_DRV_DS1553
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tristate "Maxim/Dallas DS1553"
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help
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If you say yes here you get support for the
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Maxim/Dallas DS1553 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1553.
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config RTC_DRV_DS1742
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tristate "Maxim/Dallas DS1742/1743"
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help
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If you say yes here you get support for the
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Maxim/Dallas DS1742/1743 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1742.
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config RTC_DRV_STK17TA8
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tristate "Simtek STK17TA8"
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depends on RTC_CLASS
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help
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If you say yes here you get support for the
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Simtek STK17TA8 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-stk17ta8.
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config RTC_DRV_M48T86
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tristate "ST M48T86/Dallas DS12887"
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help
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If you say Y here you will get support for the
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ST M48T86 and Dallas DS12887 RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-m48t86.
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config RTC_DRV_M48T59
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tristate "ST M48T59"
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help
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If you say Y here you will get support for the
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ST M48T59 RTC chip.
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This driver can also be built as a module, if so, the module
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will be called "rtc-m48t59".
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config RTC_DRV_V3020
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tristate "EM Microelectronic V3020"
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help
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If you say yes here you will get support for the
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EM Microelectronic v3020 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-v3020.
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comment "on-CPU RTC drivers"
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config RTC_DRV_OMAP
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tristate "TI OMAP1"
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depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
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help
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Say "yes" here to support the real time clock on TI OMAP1 chips.
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This driver can also be built as a module called rtc-omap.
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config RTC_DRV_S3C
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tristate "Samsung S3C series SoC RTC"
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depends on ARCH_S3C2410
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help
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RTC (Realtime Clock) driver for the clock inbuilt into the
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Samsung S3C24XX series of SoCs. This can provide periodic
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interrupt rates from 1Hz to 64Hz for user programs, and
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wakeup from Alarm.
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The driver currently supports the common features on all the
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S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
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and S3C2442.
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This driver can also be build as a module. If so, the module
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will be called rtc-s3c.
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config RTC_DRV_EP93XX
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tristate "Cirrus Logic EP93XX"
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depends on ARCH_EP93XX
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help
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If you say yes here you get support for the
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RTC embedded in the Cirrus Logic EP93XX processors.
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This driver can also be built as a module. If so, the module
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will be called rtc-ep93xx.
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config RTC_DRV_SA1100
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tristate "SA11x0/PXA2xx"
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depends on ARCH_SA1100 || ARCH_PXA
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help
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If you say Y here you will get access to the real time clock
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built into your SA11x0 or PXA2xx CPU.
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To compile this driver as a module, choose M here: the
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module will be called rtc-sa1100.
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config RTC_DRV_SH
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tristate "SuperH On-Chip RTC"
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depends on RTC_CLASS && SUPERH
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help
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Say Y here to enable support for the on-chip RTC found in
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most SuperH processors.
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To compile this driver as a module, choose M here: the
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module will be called rtc-sh.
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config RTC_DRV_VR41XX
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tristate "NEC VR41XX"
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depends on CPU_VR41XX
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help
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If you say Y here you will get access to the real time clock
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built into your NEC VR41XX CPU.
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To compile this driver as a module, choose M here: the
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module will be called rtc-vr41xx.
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config RTC_DRV_PL031
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tristate "ARM AMBA PL031 RTC"
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depends on ARM_AMBA
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help
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If you say Y here you will get access to ARM AMBA
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PrimeCell PL031 RTC found on certain ARM SOCs.
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To compile this driver as a module, choose M here: the
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module will be called rtc-pl031.
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config RTC_DRV_AT32AP700X
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tristate "AT32AP700X series RTC"
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depends on PLATFORM_AT32AP
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help
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Driver for the internal RTC (Realtime Clock) on Atmel AVR32
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AT32AP700x family processors.
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config RTC_DRV_AT91RM9200
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tristate "AT91RM9200 or AT91SAM9RL"
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depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
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help
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Driver for the internal RTC (Realtime Clock) module found on
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Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
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this is powered by the backup power supply.
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config RTC_DRV_AT91SAM9
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tristate "AT91SAM9x"
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depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
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help
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RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
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These timers are powered by the backup power supply (such as a
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small coin cell battery), but do not need to be used as RTCs.
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(On AT91SAM9rl chips you probably want to use the dedicated RTC
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module and leave the RTT available for other uses.)
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config RTC_DRV_AT91SAM9_RTT
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int
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range 0 1
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default 0
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prompt "RTT module Number" if ARCH_AT91SAM9263
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|
depends on RTC_DRV_AT91SAM9
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help
|
|
More than one RTT module is available. You can choose which
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one will be used as an RTC. The default of zero is normally
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|
OK to use, though some systems use that for non-RTC purposes.
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config RTC_DRV_AT91SAM9_GPBR
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int
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range 0 3 if !ARCH_AT91SAM9263
|
|
range 0 15 if ARCH_AT91SAM9263
|
|
default 0
|
|
prompt "Backup Register Number"
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|
depends on RTC_DRV_AT91SAM9
|
|
help
|
|
The RTC driver needs to use one of the General Purpose Backup
|
|
Registers (GPBRs) as well as the RTT. You can choose which one
|
|
will be used. The default of zero is normally OK to use, but
|
|
on some systems other software needs to use that register.
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|
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|
config RTC_DRV_BFIN
|
|
tristate "Blackfin On-Chip RTC"
|
|
depends on BLACKFIN
|
|
help
|
|
If you say yes here you will get support for the
|
|
Blackfin On-Chip Real Time Clock.
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|
|
|
This driver can also be built as a module. If so, the module
|
|
will be called rtc-bfin.
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|
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config RTC_DRV_RS5C313
|
|
tristate "Ricoh RS5C313"
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|
depends on SH_LANDISK
|
|
help
|
|
If you say yes here you get support for the Ricoh RS5C313 RTC chips.
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|
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|
endif # RTC_CLASS
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