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Message-Id: <11803414821370-git-send-email-bryan.wu@analog.com>
Date: Mon, 28 May 2007 16:37:54 +0800
From: Bryan Wu <bryan.wu@...log.com>
To: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org
Cc: Mike Frysinger <michael.frysinger@...log.com>,
Bryan Wu <bryan.wu@...log.com>,
Wim Van Sebroeck <wim@...ana.be>
Subject: [PATCH 19/20] Blackfin on-chip watchdog driver
From: Mike Frysinger <michael.frysinger@...log.com>
This patch implements the driver necessary use the Analog Devices
Blackfin processor's on-chip watchdog controller, supports
BF53[123]/BF53[467]/BF561.
Signed-off-by: Mike Frysinger <michael.frysinger@...log.com>
Signed-off-by: Bryan Wu <bryan.wu@...log.com>
Cc: Wim Van Sebroeck <wim@...ana.be>
---
Documentation/watchdog/watchdog-api.txt | 25 +-
MAINTAINERS | 8 +
drivers/char/watchdog/Kconfig | 13 +
drivers/char/watchdog/Kconfig.orig | 768 +++++++++++++++++++++++++++++++
drivers/char/watchdog/Makefile | 3 +
drivers/char/watchdog/bfin_wdt.c | 621 +++++++++++++++++++++++++
6 files changed, 1437 insertions(+), 1 deletions(-)
create mode 100644 drivers/char/watchdog/Kconfig.orig
create mode 100644 drivers/char/watchdog/bfin_wdt.c
diff --git a/Documentation/watchdog/watchdog-api.txt b/Documentation/watchdog/watchdog-api.txt
index 8d16f6f..b7b77ac 100644
--- a/Documentation/watchdog/watchdog-api.txt
+++ b/Documentation/watchdog/watchdog-api.txt
@@ -252,7 +252,30 @@ advantechwdt.c -- Advantech Single Board Computer
GETSUPPORT returns WDIOF_KEEPALIVEPING and WDIOF_SETTIMEOUT.
The GETSTATUS call returns if the device is open or not.
[FIXME -- silliness again?]
-
+
+bfin_wdt.c -- Blackfin On-Chip Watchdog Timer
+
+ Timeout defaults to 20 seconds and is limited to 2^32 /
+ System Clock HZ, supports SETTIMEOUT.
+
+ Supports CONFIG_WATCHDOG_NOWAYOUT.
+
+ GETSUPPORT returns WDIOF_KEEPALIVEPING and WDIOF_SETTIMEOUT.
+
+ GETBOOTSTATUS is supported. GETSTATUS returns whether the
+ watchdog timer has expired (useful when watchdog generates an
+ interrupt rather than resets the processor).
+
+ The watchdog can be configured to reset the part, signal an
+ interrupt, or issue an NMI.
+
+ The dual core parts have two watchdog devices. Only the
+ watchdog on the core actually running Linux is supported.
+
+ The default interrupt behavior is for waking up the processor.
+ Board people can customize this behavior; see the driver for
+ more information.
+
booke_wdt.c -- PowerPC BookE Watchdog Timer
Timeout default varies according to frequency, supports
diff --git a/MAINTAINERS b/MAINTAINERS
index 0736b64..1d7b1ce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -767,6 +767,14 @@ L: uclinux-dist-devel@...ckfin.uclinux.org (subscribers-only)
W: http://blackfin.uclinux.org
S: Supported
+BLACKFIN WATCHDOG DRIVER
+P: Mike Frysinger
+M: michael.frysinger@...log.com
+M: vapier.adi@...il.com
+L: uclinux-dist-devel@...ckfin.uclinux.org (subscribers-only)
+W: http://blackfin.uclinux.org
+S: Supported
+
BAYCOM/HDLCDRV DRIVERS FOR AX.25
P: Thomas Sailer
M: t.sailer@...mni.ethz.ch
diff --git a/drivers/char/watchdog/Kconfig b/drivers/char/watchdog/Kconfig
index 1cad32c..43383f5 100644
--- a/drivers/char/watchdog/Kconfig
+++ b/drivers/char/watchdog/Kconfig
@@ -609,6 +609,19 @@ config SH_WDT_MMAP
If you say Y here, user applications will be able to mmap the
WDT/CPG registers.
+# Blackfin Architecture
+
+config BFIN_WDT
+ tristate "Blackfin On-Chip Watchdog Timer"
+ depends on WATCHDOG && BLACKFIN
+ ---help---
+ If you say yes here you will get support for the Blackfin On-Chip
+ Watchdog Timer. If you have one of these processors and wish to
+ have watchdog support enabled, say Y, otherwise say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called bfin_wdt.
+
# SPARC64 Architecture
config WATCHDOG_CP1XXX
diff --git a/drivers/char/watchdog/Kconfig.orig b/drivers/char/watchdog/Kconfig.orig
new file mode 100644
index 0000000..1cad32c
--- /dev/null
+++ b/drivers/char/watchdog/Kconfig.orig
@@ -0,0 +1,768 @@
+#
+# Watchdog device configuration
+#
+
+menuconfig WATCHDOG
+ bool "Watchdog Timer Support"
+ ---help---
+ If you say Y here (and to one of the following options) and create a
+ character special file /dev/watchdog with major number 10 and minor
+ number 130 using mknod ("man mknod"), you will get a watchdog, i.e.:
+ subsequently opening the file and then failing to write to it for
+ longer than 1 minute will result in rebooting the machine. This
+ could be useful for a networked machine that needs to come back
+ on-line as fast as possible after a lock-up. There's both a watchdog
+ implementation entirely in software (which can sometimes fail to
+ reboot the machine) and a driver for hardware watchdog boards, which
+ are more robust and can also keep track of the temperature inside
+ your computer. For details, read <file:Documentation/watchdog/watchdog.txt>
+ in the kernel source.
+
+ The watchdog is usually used together with the watchdog daemon
+ which is available from
+ <ftp://ibiblio.org/pub/Linux/system/daemons/watchdog/>. This daemon can
+ also monitor NFS connections and can reboot the machine when the process
+ table is full.
+
+ If unsure, say N.
+
+if WATCHDOG
+
+config WATCHDOG_NOWAYOUT
+ bool "Disable watchdog shutdown on close"
+ help
+ The default watchdog behaviour (which you get if you say N here) is
+ to stop the timer if the process managing it closes the file
+ /dev/watchdog. It's always remotely possible that this process might
+ get killed. If you say Y here, the watchdog cannot be stopped once
+ it has been started.
+
+#
+# General Watchdog drivers
+#
+
+comment "Watchdog Device Drivers"
+
+# Architecture Independent
+
+config SOFT_WATCHDOG
+ tristate "Software watchdog"
+ help
+ A software monitoring watchdog. This will fail to reboot your system
+ from some situations that the hardware watchdog will recover
+ from. Equally it's a lot cheaper to install.
+
+ To compile this driver as a module, choose M here: the
+ module will be called softdog.
+
+# ARM Architecture
+
+config AT91RM9200_WATCHDOG
+ tristate "AT91RM9200 watchdog"
+ depends on ARCH_AT91RM9200
+ help
+ Watchdog timer embedded into AT91RM9200 chips. This will reboot your
+ system when the timeout is reached.
+
+config 21285_WATCHDOG
+ tristate "DC21285 watchdog"
+ depends on FOOTBRIDGE
+ help
+ The Intel Footbridge chip contains a built-in watchdog circuit. Say Y
+ here if you wish to use this. Alternatively say M to compile the
+ driver as a module, which will be called wdt285.
+
+ This driver does not work on all machines. In particular, early CATS
+ boards have hardware problems that will cause the machine to simply
+ lock up if the watchdog fires.
+
+ "If in doubt, leave it out" - say N.
+
+config 977_WATCHDOG
+ tristate "NetWinder WB83C977 watchdog"
+ depends on FOOTBRIDGE && ARCH_NETWINDER
+ help
+ Say Y here to include support for the WB977 watchdog included in
+ NetWinder machines. Alternatively say M to compile the driver as
+ a module, which will be called wdt977.
+
+ Not sure? It's safe to say N.
+
+config IXP2000_WATCHDOG
+ tristate "IXP2000 Watchdog"
+ depends on ARCH_IXP2000
+ help
+ Say Y here if to include support for the watchdog timer
+ in the Intel IXP2000(2400, 2800, 2850) network processors.
+ This driver can be built as a module by choosing M. The module
+ will be called ixp2000_wdt.
+
+ Say N if you are unsure.
+
+config IXP4XX_WATCHDOG
+ tristate "IXP4xx Watchdog"
+ depends on ARCH_IXP4XX
+ help
+ Say Y here if to include support for the watchdog timer
+ in the Intel IXP4xx network processors. This driver can
+ be built as a module by choosing M. The module will
+ be called ixp4xx_wdt.
+
+ Note: The internal IXP4xx watchdog does a soft CPU reset
+ which doesn't reset any peripherals. There are circumstances
+ where the watchdog will fail to reset the board correctly
+ (e.g., if the boot ROM is in an unreadable state).
+
+ Say N if you are unsure.
+
+config S3C2410_WATCHDOG
+ tristate "S3C2410 Watchdog"
+ depends on ARCH_S3C2410
+ help
+ Watchdog timer block in the Samsung S3C2410 chips. This will
+ reboot the system when the timer expires with the watchdog
+ enabled.
+
+ The driver is limited by the speed of the system's PCLK
+ signal, so with reasonably fast systems (PCLK around 50-66MHz)
+ then watchdog intervals of over approximately 20seconds are
+ unavailable.
+
+ The driver can be built as a module by choosing M, and will
+ be called s3c2410_wdt
+
+config SA1100_WATCHDOG
+ tristate "SA1100/PXA2xx watchdog"
+ depends on ARCH_SA1100 || ARCH_PXA
+ help
+ Watchdog timer embedded into SA11x0 and PXA2xx chips. This will
+ reboot your system when timeout is reached.
+
+ NOTE: once enabled, this timer cannot be disabled.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sa1100_wdt.
+
+config MPCORE_WATCHDOG
+ tristate "MPcore watchdog"
+ depends on ARM_MPCORE_PLATFORM && LOCAL_TIMERS
+ help
+ Watchdog timer embedded into the MPcore system.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mpcore_wdt.
+
+config EP93XX_WATCHDOG
+ tristate "EP93xx Watchdog"
+ depends on ARCH_EP93XX
+ help
+ Say Y here if to include support for the watchdog timer
+ embedded in the Cirrus Logic EP93xx family of devices.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ep93xx_wdt.
+
+config OMAP_WATCHDOG
+ tristate "OMAP Watchdog"
+ depends on ARCH_OMAP16XX || ARCH_OMAP24XX
+ help
+ Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog. Say 'Y' here to
+ enable the OMAP1610/OMAP1710 watchdog timer.
+
+config PNX4008_WATCHDOG
+ tristate "PNX4008 Watchdog"
+ depends on ARCH_PNX4008
+ help
+ Say Y here if to include support for the watchdog timer
+ in the PNX4008 processor.
+ This driver can be built as a module by choosing M. The module
+ will be called pnx4008_wdt.
+
+ Say N if you are unsure.
+
+# X86 (i386 + ia64 + x86_64) Architecture
+
+config ACQUIRE_WDT
+ tristate "Acquire SBC Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on Single Board
+ Computers produced by Acquire Inc (and others). This watchdog
+ simply watches your kernel to make sure it doesn't freeze, and if
+ it does, it reboots your computer after a certain amount of time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called acquirewdt.
+
+ Most people will say N.
+
+config ADVANTECH_WDT
+ tristate "Advantech SBC Watchdog Timer"
+ depends on X86
+ help
+ If you are configuring a Linux kernel for the Advantech single-board
+ computer, say `Y' here to support its built-in watchdog timer
+ feature. More information can be found at
+ <http://www.advantech.com.tw/products/>
+
+config ALIM1535_WDT
+ tristate "ALi M1535 PMU Watchdog Timer"
+ depends on X86 && PCI
+ ---help---
+ This is the driver for the hardware watchdog on the ALi M1535 PMU.
+
+ To compile this driver as a module, choose M here: the
+ module will be called alim1535_wdt.
+
+ Most people will say N.
+
+config ALIM7101_WDT
+ tristate "ALi M7101 PMU Computer Watchdog"
+ depends on X86 && PCI
+ help
+ This is the driver for the hardware watchdog on the ALi M7101 PMU
+ as used in the x86 Cobalt servers.
+
+ To compile this driver as a module, choose M here: the
+ module will be called alim7101_wdt.
+
+ Most people will say N.
+
+config SC520_WDT
+ tristate "AMD Elan SC520 processor Watchdog"
+ depends on X86
+ help
+ This is the driver for the hardware watchdog built in to the
+ AMD "Elan" SC520 microcomputer commonly used in embedded systems.
+ This watchdog simply watches your kernel to make sure it doesn't
+ freeze, and if it does, it reboots your computer after a certain
+ amount of time.
+
+ You can compile this driver directly into the kernel, or use
+ it as a module. The module will be called sc520_wdt.
+
+config EUROTECH_WDT
+ tristate "Eurotech CPU-1220/1410 Watchdog Timer"
+ depends on X86
+ help
+ Enable support for the watchdog timer on the Eurotech CPU-1220 and
+ CPU-1410 cards. These are PC/104 SBCs. Spec sheets and product
+ information are at <http://www.eurotech.it/>.
+
+config IB700_WDT
+ tristate "IB700 SBC Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the IB700 Single
+ Board Computer produced by TMC Technology (www.tmc-uk.com). This watchdog
+ simply watches your kernel to make sure it doesn't freeze, and if
+ it does, it reboots your computer after a certain amount of time.
+
+ This driver is like the WDT501 driver but for slightly different hardware.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ib700wdt.
+
+ Most people will say N.
+
+config IBMASR
+ tristate "IBM Automatic Server Restart"
+ depends on X86
+ help
+ This is the driver for the IBM Automatic Server Restart watchdog
+ timer built-in into some eServer xSeries machines.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ibmasr.
+
+config WAFER_WDT
+ tristate "ICP Wafer 5823 Single Board Computer Watchdog"
+ depends on X86
+ help
+ This is a driver for the hardware watchdog on the ICP Wafer 5823
+ Single Board Computer (and probably other similar models).
+
+ To compile this driver as a module, choose M here: the
+ module will be called wafer5823wdt.
+
+config I6300ESB_WDT
+ tristate "Intel 6300ESB Timer/Watchdog"
+ depends on X86 && PCI
+ ---help---
+ Hardware driver for the watchdog timer built into the Intel
+ 6300ESB controller hub.
+
+ To compile this driver as a module, choose M here: the
+ module will be called i6300esb.
+
+config ITCO_WDT
+ tristate "Intel TCO Timer/Watchdog"
+ depends on (X86 || IA64) && PCI
+ ---help---
+ Hardware driver for the intel TCO timer based watchdog devices.
+ These drivers are included in the Intel 82801 I/O Controller
+ Hub family (from ICH0 up to ICH8) and in the Intel 6300ESB
+ controller hub.
+
+ The TCO (Total Cost of Ownership) timer is a watchdog timer
+ that will reboot the machine after its second expiration. The
+ expiration time can be configured with the "heartbeat" parameter.
+
+ On some motherboards the driver may fail to reset the chipset's
+ NO_REBOOT flag which prevents the watchdog from rebooting the
+ machine. If this is the case you will get a kernel message like
+ "failed to reset NO_REBOOT flag, reboot disabled by hardware".
+
+ To compile this driver as a module, choose M here: the
+ module will be called iTCO_wdt.
+
+config ITCO_VENDOR_SUPPORT
+ bool "Intel TCO Timer/Watchdog Specific Vendor Support"
+ depends on ITCO_WDT
+ ---help---
+ Add vendor specific support to the intel TCO timer based watchdog
+ devices. At this moment we only have additional support for some
+ SuperMicro Inc. motherboards.
+
+config SC1200_WDT
+ tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
+ depends on X86
+ help
+ This is a driver for National Semiconductor PC87307/PC97307 hardware
+ watchdog cards as found on the SC1200. This watchdog is mainly used
+ for power management purposes and can be used to power down the device
+ during inactivity periods (includes interrupt activity monitoring).
+
+ To compile this driver as a module, choose M here: the
+ module will be called sc1200wdt.
+
+ Most people will say N.
+
+config SCx200_WDT
+ tristate "National Semiconductor SCx200 Watchdog"
+ depends on SCx200 && PCI
+ help
+ Enable the built-in watchdog timer support on the National
+ Semiconductor SCx200 processors.
+
+ If compiled as a module, it will be called scx200_wdt.
+
+config PC87413_WDT
+ tristate "NS PC87413 watchdog"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the PC87413 chipset
+ This watchdog simply watches your kernel to make sure it doesn't
+ freeze, and if it does, it reboots your computer after a certain
+ amount of time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pc87413_wdt.
+
+ Most people will say N.
+
+config 60XX_WDT
+ tristate "SBC-60XX Watchdog Timer"
+ depends on X86
+ help
+ This driver can be used with the watchdog timer found on some
+ single board computers, namely the 6010 PII based computer.
+ It may well work with other cards. It reads port 0x443 to enable
+ and re-set the watchdog timer, and reads port 0x45 to disable
+ the watchdog. If you have a card that behave in similar ways,
+ you can probably make this driver work with your card as well.
+
+ You can compile this driver directly into the kernel, or use
+ it as a module. The module will be called sbc60xxwdt.
+
+config SBC8360_WDT
+ tristate "SBC8360 Watchdog Timer"
+ depends on X86
+ ---help---
+
+ This is the driver for the hardware watchdog on the SBC8360 Single
+ Board Computer produced by Axiomtek Co., Ltd. (www.axiomtek.com).
+
+ To compile this driver as a module, choose M here: the
+ module will be called sbc8360.ko.
+
+ Most people will say N.
+
+config CPU5_WDT
+ tristate "SMA CPU5 Watchdog"
+ depends on X86
+ ---help---
+ TBD.
+ To compile this driver as a module, choose M here: the
+ module will be called cpu5wdt.
+
+config SMSC37B787_WDT
+ tristate "Winbond SMsC37B787 Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog component on the
+ Winbond SMsC37B787 chipset as used on the NetRunner Mainboard
+ from Vision Systems and maybe others.
+
+ This watchdog simply watches your kernel to make sure it doesn't
+ freeze, and if it does, it reboots your computer after a certain
+ amount of time.
+
+ Usually a userspace daemon will notify the kernel WDT driver that
+ userspace is still alive, at regular intervals.
+
+ To compile this driver as a module, choose M here: the
+ module will be called smsc37b787_wdt.
+
+ Most people will say N.
+
+config W83627HF_WDT
+ tristate "W83627HF Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the W83627HF chipset
+ as used in Advantech PC-9578 and Tyan S2721-533 motherboards
+ (and likely others). This watchdog simply watches your kernel to
+ make sure it doesn't freeze, and if it does, it reboots your computer
+ after a certain amount of time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called w83627hf_wdt.
+
+ Most people will say N.
+
+config W83697HF_WDT
+ tristate "W83697HF/W83697HG Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the W83697HF/HG
+ chipset as used in Dedibox/VIA motherboards (and likely others).
+ This watchdog simply watches your kernel to make sure it doesn't
+ freeze, and if it does, it reboots your computer after a certain
+ amount of time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called w83697hf_wdt.
+
+ Most people will say N.
+
+config W83877F_WDT
+ tristate "W83877F (EMACS) Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the W83877F chipset
+ as used in EMACS PC-104 motherboards (and likely others). This
+ watchdog simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called w83877f_wdt.
+
+ Most people will say N.
+
+config W83977F_WDT
+ tristate "W83977F (PCM-5335) Watchdog Timer"
+ depends on X86
+ ---help---
+ This is the driver for the hardware watchdog on the W83977F I/O chip
+ as used in AAEON's PCM-5335 SBC (and likely others). This
+ watchdog simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called w83977f_wdt.
+
+config MACHZ_WDT
+ tristate "ZF MachZ Watchdog"
+ depends on X86
+ ---help---
+ If you are using a ZF Micro MachZ processor, say Y here, otherwise
+ N. This is the driver for the watchdog timer built-in on that
+ processor using ZF-Logic interface. This watchdog simply watches
+ your kernel to make sure it doesn't freeze, and if it does, it
+ reboots your computer after a certain amount of time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called machzwd.
+
+config SBC_EPX_C3_WATCHDOG
+ tristate "Winsystems SBC EPX-C3 watchdog"
+ depends on X86
+ ---help---
+ This is the driver for the built-in watchdog timer on the EPX-C3
+ Single-board computer made by Winsystems, Inc.
+
+ *Note*: This hardware watchdog is not probeable and thus there
+ is no way to know if writing to its IO address will corrupt
+ your system or have any real effect. The only way to be sure
+ that this driver does what you want is to make sure you
+ are running it on an EPX-C3 from Winsystems with the watchdog
+ timer at IO address 0x1ee and 0x1ef. It will write to both those
+ IO ports. Basically, the assumption is made that if you compile
+ this driver into your kernel and/or load it as a module, that you
+ know what you are doing and that you are in fact running on an
+ EPX-C3 board!
+
+ To compile this driver as a module, choose M here: the
+ module will be called sbc_epx_c3.
+
+# PowerPC Architecture
+
+config 8xx_WDT
+ tristate "MPC8xx Watchdog Timer"
+ depends on 8xx
+
+config 83xx_WDT
+ tristate "MPC83xx Watchdog Timer"
+ depends on PPC_83xx
+
+config MV64X60_WDT
+ tristate "MV64X60 (Marvell Discovery) Watchdog Timer"
+ depends on MV64X60
+
+config BOOKE_WDT
+ bool "PowerPC Book-E Watchdog Timer"
+ depends on BOOKE || 4xx
+ ---help---
+ Please see Documentation/watchdog/watchdog-api.txt for
+ more information.
+
+# PPC64 Architecture
+
+config WATCHDOG_RTAS
+ tristate "RTAS watchdog"
+ depends on PPC_RTAS
+ help
+ This driver adds watchdog support for the RTAS watchdog.
+
+ To compile this driver as a module, choose M here. The module
+ will be called wdrtas.
+
+# MIPS Architecture
+
+config INDYDOG
+ tristate "Indy/I2 Hardware Watchdog"
+ depends on SGI_IP22
+ help
+ Hardware driver for the Indy's/I2's watchdog. This is a
+ watchdog timer that will reboot the machine after a 60 second
+ timer expired and no process has written to /dev/watchdog during
+ that time.
+
+config WDT_MTX1
+ tristate "MTX-1 Hardware Watchdog"
+ depends on MIPS_MTX1
+ help
+ Hardware driver for the MTX-1 boards. This is a watchdog timer that
+ will reboot the machine after a 100 seconds timer expired.
+
+config WDT_RM9K_GPI
+ tristate "RM9000/GPI hardware watchdog"
+ depends on CPU_RM9000
+ help
+ Watchdog implementation using the GPI hardware found on
+ PMC-Sierra RM9xxx CPUs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called rm9k_wdt.
+
+# S390 Architecture
+
+config ZVM_WATCHDOG
+ tristate "z/VM Watchdog Timer"
+ depends on S390
+ help
+ IBM s/390 and zSeries machines running under z/VM 5.1 or later
+ provide a virtual watchdog timer to their guest that cause a
+ user define Control Program command to be executed after a
+ timeout.
+
+ To compile this driver as a module, choose M here. The module
+ will be called vmwatchdog.
+
+# SUPERH Architecture
+
+config SH_WDT
+ tristate "SuperH Watchdog"
+ depends on SUPERH
+ help
+ This driver adds watchdog support for the integrated watchdog in the
+ SuperH processors. If you have one of these processors and wish
+ to have watchdog support enabled, say Y, otherwise say N.
+
+ As a side note, saying Y here will automatically boost HZ to 1000
+ so that the timer has a chance to clear the overflow counter. On
+ slower systems (such as the SH-2 and SH-3) this will likely yield
+ some performance issues. As such, the WDT should be avoided here
+ unless it is absolutely necessary.
+
+ To compile this driver as a module, choose M here: the
+ module will be called shwdt.
+
+config SH_WDT_MMAP
+ bool "Allow mmap of SH WDT"
+ default n
+ depends on SH_WDT
+ help
+ If you say Y here, user applications will be able to mmap the
+ WDT/CPG registers.
+
+# SPARC64 Architecture
+
+config WATCHDOG_CP1XXX
+ tristate "CP1XXX Hardware Watchdog support"
+ depends on SPARC64 && PCI
+ ---help---
+ This is the driver for the hardware watchdog timers present on
+ Sun Microsystems CompactPCI models CP1400 and CP1500.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cpwatchdog.
+
+ If you do not have a CompactPCI model CP1400 or CP1500, or
+ another UltraSPARC-IIi-cEngine boardset with hardware watchdog,
+ you should say N to this option.
+
+config WATCHDOG_RIO
+ tristate "RIO Hardware Watchdog support"
+ depends on SPARC64 && PCI
+ help
+ Say Y here to support the hardware watchdog capability on Sun RIO
+ machines. The watchdog timeout period is normally one minute but
+ can be changed with a boot-time parameter.
+
+#
+# ISA-based Watchdog Cards
+#
+
+comment "ISA-based Watchdog Cards"
+ depends on ISA
+
+config PCWATCHDOG
+ tristate "Berkshire Products ISA-PC Watchdog"
+ depends on ISA
+ ---help---
+ This is the driver for the Berkshire Products ISA-PC Watchdog card.
+ This card simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time. This driver is like the WDT501 driver but for different
+ hardware. Please read <file:Documentation/watchdog/pcwd-watchdog.txt>. The PC
+ watchdog cards can be ordered from <http://www.berkprod.com/>.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pcwd.
+
+ Most people will say N.
+
+config MIXCOMWD
+ tristate "Mixcom Watchdog"
+ depends on ISA
+ ---help---
+ This is a driver for the Mixcom hardware watchdog cards. This
+ watchdog simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time.
+
+ To compile this driver as a module, choose M here: the
+ module will be called mixcomwd.
+
+ Most people will say N.
+
+config WDT
+ tristate "WDT Watchdog timer"
+ depends on ISA
+ ---help---
+ If you have a WDT500P or WDT501P watchdog board, say Y here,
+ otherwise N. It is not possible to probe for this board, which means
+ that you have to inform the kernel about the IO port and IRQ that
+ is needed (you can do this via the io and irq parameters)
+
+ To compile this driver as a module, choose M here: the
+ module will be called wdt.
+
+config WDT_501
+ bool "WDT501 features"
+ depends on WDT
+ help
+ Saying Y here and creating a character special file /dev/temperature
+ with major number 10 and minor number 131 ("man mknod") will give
+ you a thermometer inside your computer: reading from
+ /dev/temperature yields one byte, the temperature in degrees
+ Fahrenheit. This works only if you have a WDT501P watchdog board
+ installed.
+
+ If you want to enable the Fan Tachometer on the WDT501P, then you
+ can do this via the tachometer parameter. Only do this if you have a
+ fan tachometer actually set up.
+
+#
+# PCI-based Watchdog Cards
+#
+
+comment "PCI-based Watchdog Cards"
+ depends on PCI
+
+config PCIPCWATCHDOG
+ tristate "Berkshire Products PCI-PC Watchdog"
+ depends on PCI
+ ---help---
+ This is the driver for the Berkshire Products PCI-PC Watchdog card.
+ This card simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time. The card can also monitor the internal temperature of the PC.
+ More info is available at <http://www.berkprod.com/pci_pc_watchdog.htm>.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pcwd_pci.
+
+ Most people will say N.
+
+config WDTPCI
+ tristate "PCI-WDT500/501 Watchdog timer"
+ depends on PCI
+ ---help---
+ If you have a PCI-WDT500/501 watchdog board, say Y here, otherwise N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called wdt_pci.
+
+config WDT_501_PCI
+ bool "PCI-WDT501 features"
+ depends on WDTPCI
+ help
+ Saying Y here and creating a character special file /dev/temperature
+ with major number 10 and minor number 131 ("man mknod") will give
+ you a thermometer inside your computer: reading from
+ /dev/temperature yields one byte, the temperature in degrees
+ Fahrenheit. This works only if you have a PCI-WDT501 watchdog board
+ installed.
+
+ If you want to enable the Fan Tachometer on the PCI-WDT501, then you
+ can do this via the tachometer parameter. Only do this if you have a
+ fan tachometer actually set up.
+
+#
+# USB-based Watchdog Cards
+#
+
+comment "USB-based Watchdog Cards"
+ depends on USB
+
+config USBPCWATCHDOG
+ tristate "Berkshire Products USB-PC Watchdog"
+ depends on USB
+ ---help---
+ This is the driver for the Berkshire Products USB-PC Watchdog card.
+ This card simply watches your kernel to make sure it doesn't freeze,
+ and if it does, it reboots your computer after a certain amount of
+ time. The card can also monitor the internal temperature of the PC.
+ More info is available at <http://www.berkprod.com/usb_pc_watchdog.htm>.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pcwd_usb.
+
+ Most people will say N.
+
+endif # WATCHDOG
diff --git a/drivers/char/watchdog/Makefile b/drivers/char/watchdog/Makefile
index 8bfc00c..de1d75d 100644
--- a/drivers/char/watchdog/Makefile
+++ b/drivers/char/watchdog/Makefile
@@ -80,6 +80,9 @@ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
# SUPERH Architecture
obj-$(CONFIG_SH_WDT) += shwdt.o
+# Blackfin Architecture
+obj-$(CONFIG_BFIN_WDT) += bfin_wdt.o
+
# SPARC64 Architecture
# Architecture Independant
diff --git a/drivers/char/watchdog/bfin_wdt.c b/drivers/char/watchdog/bfin_wdt.c
new file mode 100644
index 0000000..d049a4c
--- /dev/null
+++ b/drivers/char/watchdog/bfin_wdt.c
@@ -0,0 +1,621 @@
+/*
+ * Blackfin On-Chip Watchdog Driver
+ * Supports BF53[123]/BF53[467]/BF561
+ *
+ * Originally based on softdog.c
+ * Copyright 2006-2007 Analog Devices Inc.
+ * Copyright 2006-2007 Michele d'Amico
+ * Copyright 1996 Alan Cox <alan@...hat.com>
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/* Notes for people customizing General Purpose Interrupt (GPI) behavior.
+ *
+ * Normally when the watchdog times out, you reboot the system. In
+ * some scenarios, you would rather have the machine come to a complete
+ * halt. Or perhaps you want to wake the system up from sleep. If the
+ * board provides some watchdog functions, we'll call those. Otherwise,
+ * we'll let the GPI event wake up the processor if it's put to sleep.
+ *
+ * The functions you should implement in your board file:
+ *
+ * irqreturn_t bfin_board_watchdog_interrupt(void);
+ * called when the interrupt is fired. perhaps you want to execute
+ * kernel_halt() or do some other crazy stuff.
+ *
+ * int bfin_board_watchdog_suspend(void);
+ * called when suspending this device. default behavior is to either
+ * mark watchdog as a wakeup source (GPI) or turn it off (RESET).
+ *
+ * int bfin_board_watchdog_resume(void);
+ * called when resuming this device. default behavior is to either
+ * unmark watchdog as a wakeup source (GPI) or turn it on (RESET).
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/blackfin.h>
+#include <asm/uaccess.h>
+
+#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args)
+#define stampit() stamp("here i am")
+
+#define WATCHDOG_NAME "bfin-wdt"
+#define PFX WATCHDOG_NAME ": "
+
+/* The BF561 has two watchdogs (one per core), but since Linux
+ * only runs on core A, we'll just work with that one.
+ */
+#ifdef BF561_FAMILY
+# define bfin_read_WDOG_CTL() bfin_read_WDOGA_CTL()
+# define bfin_read_WDOG_CNT() bfin_read_WDOGA_CNT()
+# define bfin_read_WDOG_STAT() bfin_read_WDOGA_STAT()
+# define bfin_write_WDOG_CTL(x) bfin_write_WDOGA_CTL(x)
+# define bfin_write_WDOG_CNT(x) bfin_write_WDOGA_CNT(x)
+# define bfin_write_WDOG_STAT(x) bfin_write_WDOGA_STAT(x)
+#endif
+
+/* Bit in SWRST that indicates boot caused by watchdog */
+#define SWRST_RESET_WDOG 0x4000
+
+/* Bit in WDOG_CTL that indicates watchdog has expired (WDR0) */
+#define WDOG_EXPIRED 0x8000
+
+/* Masks for WDEV field in WDOG_CTL register */
+#define ICTL_RESET 0x0
+#define ICTL_NMI 0x2
+#define ICTL_GPI 0x4
+#define ICTL_NONE 0x6
+#define ICTL_MASK 0x6
+
+/* Masks for WDEN field in WDOG_CTL register */
+#define WDEN_MASK 0x0FF0
+#define WDEN_ENABLE 0x0000
+#define WDEN_DISABLE 0x0AD0
+
+/* some defaults */
+#define WATCHDOG_TIMEOUT 20
+#define WATCHDOG_ACTION 0 /* 0 = ICTL_RESET */
+
+static unsigned int timeout = WATCHDOG_TIMEOUT;
+static int nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int action = WATCHDOG_ACTION;
+static struct watchdog_info bfin_wdt_info;
+static unsigned long open_check;
+static char expect_close, bfin_wdt_expired = 0;
+static spinlock_t bfin_wdt_spinlock = SPIN_LOCK_UNLOCKED;
+
+/**
+ * bfin_wdt_keepalive - Keep the Userspace Watchdog Alive
+ *
+ * The Userspace watchdog got a KeepAlive: schedule the next timeout.
+ */
+static int bfin_wdt_keepalive(void)
+{
+ stampit();
+ bfin_write_WDOG_STAT(0);
+ return 0;
+}
+
+/**
+ * bfin_wdt_stop - Stop the Watchdog
+ *
+ * Stops the on-chip watchdog.
+ */
+static int bfin_wdt_stop(void)
+{
+ stampit();
+ bfin_write_WDOG_CTL((bfin_read_WDOG_CTL() & ~WDEN_MASK) | WDEN_DISABLE);
+ return 0;
+}
+
+/**
+ * bfin_wdt_start - Start the Watchdog
+ *
+ * Starts the on-chip watchdog. Automatically loads WDOG_CNT
+ * into WDOG_STAT for us.
+ */
+static int bfin_wdt_start(void)
+{
+ stampit();
+ bfin_write_WDOG_CTL((bfin_read_WDOG_CTL() & ~WDEN_MASK) | WDEN_ENABLE);
+ return 0;
+}
+
+/**
+ * bfin_wdt_running - Check Watchdog status
+ *
+ * See if the watchdog is running.
+ */
+static int bfin_wdt_running(void)
+{
+ return ((bfin_read_WDOG_CTL() & WDEN_MASK) != WDEN_DISABLE);
+}
+
+/**
+ * bfin_wdt_set_timeout - Set the Userspace Watchdog timeout
+ * @t: new timeout value (in seconds)
+ *
+ * Translate the specified timeout in seconds into System Clock
+ * terms which is what the on-chip Watchdog requires.
+ */
+static int bfin_wdt_set_timeout(unsigned long t)
+{
+ u32 cnt;
+ unsigned long flags;
+
+ stampit();
+
+ cnt = t * get_sclk();
+ if (cnt < get_sclk()) {
+ printk(KERN_WARNING PFX "timeout value is too large\n");
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&bfin_wdt_spinlock, flags);
+ {
+ int run = bfin_wdt_running();
+ bfin_wdt_stop();
+ bfin_write_WDOG_CNT(cnt);
+ if (run) bfin_wdt_start();
+ }
+ spin_unlock_irqrestore(&bfin_wdt_spinlock, flags);
+
+ timeout = t;
+
+ return 0;
+}
+
+/**
+ * bfin_wdt_interrupt - General Purpose Watchdog Interrupt Handler
+ * @irq: irq # that triggered us
+ * @dev_id: this device instance
+ *
+ * Call board-specific ISR if it exists, otherwise we need to stop
+ * and start the watchdog -- simply forcing a reload of the count
+ * will not reset the interrupt status.
+ *
+ * Note: While we could interrogate the WDR0 bit in WDOG_CTL, that
+ * requires us to turn off/on the watchdog to clear it. So
+ * we'll just suck it up and mimic the bit with bfin_wdt_expired.
+ */
+extern irqreturn_t bfin_board_watchdog_interrupt(void) __attribute__((weak));
+static irqreturn_t bfin_wdt_interrupt(int irq, void *dev_id)
+{
+ bfin_wdt_expired = 1;
+ if (bfin_board_watchdog_interrupt) {
+ return bfin_board_watchdog_interrupt();
+ } else {
+ bfin_wdt_stop();
+ bfin_wdt_keepalive();
+ bfin_wdt_start();
+ return IRQ_HANDLED;
+ }
+}
+
+/**
+ * bfin_wdt_open - Open the Device
+ * @inode: inode of device
+ * @file: file handle of device
+ *
+ * Watchdog device is opened and started.
+ */
+static int bfin_wdt_open(struct inode *inode, struct file *file)
+{
+ stampit();
+
+ if (test_and_set_bit(0, &open_check))
+ return -EBUSY;
+
+ if (nowayout)
+ __module_get(THIS_MODULE);
+
+ bfin_wdt_keepalive();
+ bfin_wdt_start();
+
+ return nonseekable_open(inode, file);
+}
+
+/**
+ * bfin_wdt_close - Close the Device
+ * @inode: inode of device
+ * @file: file handle of device
+ *
+ * Watchdog device is closed and stopped.
+ */
+static int bfin_wdt_release(struct inode *inode, struct file *file)
+{
+ stampit();
+
+ if (expect_close == 42) {
+ bfin_wdt_stop();
+ } else {
+ printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ bfin_wdt_keepalive();
+ }
+
+ expect_close = 0;
+ clear_bit(0, &open_check);
+
+ return 0;
+}
+
+/**
+ * bfin_wdt_write - Write to Device
+ * @file: file handle of device
+ * @buf: buffer to write
+ * @count: length of buffer
+ * @ppos: offset
+ *
+ * Pings the watchdog on write.
+ */
+static ssize_t bfin_wdt_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
+{
+ stampit();
+
+ if (len) {
+ if (!nowayout) {
+ size_t i;
+
+ /* In case it was set long ago */
+ expect_close = 0;
+
+ for (i = 0; i != len; i++) {
+ char c;
+ if (get_user(c, data + i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 42;
+ }
+ }
+ bfin_wdt_keepalive();
+ }
+
+ return len;
+}
+
+/**
+ * bfin_wdt_ioctl - Query Device
+ * @inode: inode of device
+ * @file: file handle of device
+ * @cmd: watchdog command
+ * @arg: argument
+ *
+ * Query basic information from the device or ping it, as outlined by the
+ * watchdog API.
+ */
+static int bfin_wdt_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+
+ stampit();
+
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &bfin_wdt_info, sizeof(bfin_wdt_info)))
+ return -EFAULT;
+ else
+ return 0;
+
+ case WDIOC_GETSTATUS: {
+ int ret = bfin_wdt_expired;
+ bfin_wdt_expired = 0;
+ return put_user(ret, p);
+ }
+
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(!!(_bfin_swrst & SWRST_RESET_WDOG), p);
+
+ case WDIOC_KEEPALIVE:
+ bfin_wdt_keepalive();
+ return 0;
+
+ case WDIOC_SETTIMEOUT: {
+ int new_timeout;
+
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+
+ if (bfin_wdt_set_timeout(new_timeout))
+ return -EINVAL;
+ }
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+
+ case WDIOC_SETOPTIONS: {
+ unsigned long flags;
+ int options, ret = -EINVAL;
+
+ if (get_user(options, p))
+ return -EFAULT;
+
+ spin_lock_irqsave(&bfin_wdt_spinlock, flags);
+
+ if (options & WDIOS_DISABLECARD) {
+ bfin_wdt_stop();
+ ret = 0;
+ }
+
+ if (options & WDIOS_ENABLECARD) {
+ bfin_wdt_start();
+ ret = 0;
+ }
+
+ spin_unlock_irqrestore(&bfin_wdt_spinlock, flags);
+
+ return ret;
+ }
+ }
+}
+
+/**
+ * bfin_wdt_notify_sys - Notifier Handler
+ * @this: notifier block
+ * @code: notifier event
+ * @unused: unused
+ *
+ * Handles specific events, such as turning off the watchdog during a
+ * shutdown event.
+ */
+static int bfin_wdt_notify_sys(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ stampit();
+
+ if (code == SYS_DOWN || code == SYS_HALT)
+ bfin_wdt_stop();
+
+ return NOTIFY_DONE;
+}
+
+/**
+ * bfin_wdt_probe - Init per-device settings
+ * @pdev: device being probed
+ *
+ * If we are in GPI mode, grab the interrupt.
+ */
+static int __devinit bfin_wdt_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ stampit();
+
+ if (action == ICTL_GPI) {
+ ret = request_irq(IRQ_WATCH, bfin_wdt_interrupt,
+ IRQF_DISABLED, WATCHDOG_NAME, pdev);
+ if (ret) {
+ printk(KERN_ERR PFX "unable to allocate watchdog IRQ %i (err=%d)\n",
+ IRQ_WATCH, ret);
+ clear_bit(0, &open_check);
+ return ret;
+ }
+
+ device_init_wakeup(&pdev->dev, 0);
+ }
+
+ return 0;
+}
+
+/**
+ * bfin_wdt_remove - Free per-device settings
+ * @pdev: device being removed
+ *
+ * If we were in GPI mode, free the interrupt.
+ */
+static int __devexit bfin_wdt_remove(struct platform_device *pdev)
+{
+ stampit();
+
+ if (action == ICTL_GPI) {
+ device_init_wakeup(&pdev->dev, 0);
+ free_irq(IRQ_WATCH, pdev);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int bfin_wdt_pm_state;
+
+/**
+ * bfin_wdt_suspend - suspend the watchdog
+ * @pdev: device being suspended
+ * @state: requested suspend state
+ *
+ * Remember if the watchdog was running and stop it.
+ * TODO: is this even right? Doesn't seem to be any
+ * standard in the watchdog world ...
+ */
+extern int bfin_board_watchdog_suspend(void) __attribute__((weak));
+static int bfin_wdt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ stampit();
+
+ if (bfin_board_watchdog_suspend) {
+ return bfin_board_watchdog_suspend();
+ } else if (action == ICTL_GPI) {
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(IRQ_WATCH);
+ } else {
+ bfin_wdt_pm_state = bfin_wdt_running();
+ bfin_wdt_stop();
+ }
+
+ return 0;
+}
+
+/**
+ * bfin_wdt_resume - resume the watchdog
+ * @pdev: device being resumed
+ *
+ * If the watchdog was running, turn it back on.
+ */
+extern int bfin_board_watchdog_resume(void) __attribute__((weak));
+static int bfin_wdt_resume(struct platform_device *pdev)
+{
+ stampit();
+
+ if (bfin_board_watchdog_resume) {
+ return bfin_board_watchdog_resume();
+ } else if (action == ICTL_GPI) {
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(IRQ_WATCH);
+ } else if (bfin_wdt_pm_state) {
+ bfin_wdt_set_timeout(timeout);
+ bfin_wdt_start();
+ }
+
+ return 0;
+}
+#else
+# define bfin_wdt_suspend NULL
+# define bfin_wdt_resume NULL
+#endif
+
+static struct platform_device bfin_wdt_device = {
+ .name = WATCHDOG_NAME,
+ .id = -1,
+};
+
+static struct platform_driver bfin_wdt_driver = {
+ .driver = {
+ .name = WATCHDOG_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = bfin_wdt_probe,
+ .remove = __devexit_p(bfin_wdt_remove),
+ .suspend = bfin_wdt_suspend,
+ .resume = bfin_wdt_resume,
+};
+
+static struct file_operations bfin_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = bfin_wdt_write,
+ .ioctl = bfin_wdt_ioctl,
+ .open = bfin_wdt_open,
+ .release = bfin_wdt_release,
+};
+
+static struct miscdevice bfin_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &bfin_wdt_fops,
+};
+
+static struct watchdog_info bfin_wdt_info = {
+ .identity = "Blackfin Watchdog",
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+};
+
+static struct notifier_block bfin_wdt_notifier = {
+ .notifier_call = bfin_wdt_notify_sys,
+};
+
+/**
+ * bfin_wdt_init - Initialize module
+ *
+ * Registers the device and notifier handler. Actual device
+ * initialization is handled by bfin_wdt_open().
+ */
+static int __init bfin_wdt_init(void)
+{
+ const u16 code2action[] = { ICTL_RESET, ICTL_NMI, ICTL_GPI, ICTL_NONE };
+ int ret;
+
+ stampit();
+
+ /* Check that the timeout value is within range */
+ if (bfin_wdt_set_timeout(timeout))
+ return -EINVAL;
+
+ /* Check that the action value is within range */
+ if (action >= ARRAY_SIZE(code2action)) {
+ printk(KERN_ERR PFX "invalid action, must be: 0 (reboot), 1 (NMI), 2 (GPI), 3 (none)\n");
+ return -EINVAL;
+ } else {
+ action = code2action[action];
+ bfin_write_WDOG_CTL((bfin_read_WDOG_CTL() & ~ICTL_MASK) | action);
+ }
+
+ /* Since this is an on-chip device and needs no board-specific
+ * resources, we'll handle all the platform device stuff here.
+ */
+ ret = platform_device_register(&bfin_wdt_device);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_probe(&bfin_wdt_driver, NULL);
+ if (ret)
+ return ret;
+
+ ret = register_reboot_notifier(&bfin_wdt_notifier);
+ if (ret) {
+ printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
+ return ret;
+ }
+
+ ret = misc_register(&bfin_wdt_miscdev);
+ if (ret) {
+ printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ unregister_reboot_notifier(&bfin_wdt_notifier);
+ return ret;
+ }
+
+ printk(KERN_INFO PFX "initialized: action=%d timeout=%d sec (nowayout=%d)\n",
+ action, timeout, nowayout);
+
+ return 0;
+}
+
+/**
+ * bfin_wdt_exit - Deinitialize module
+ *
+ * Unregisters the device and notifier handler. Actual device
+ * deinitialization is handled by bfin_wdt_close().
+ */
+static void __exit bfin_wdt_exit(void)
+{
+ misc_deregister(&bfin_wdt_miscdev);
+ unregister_reboot_notifier(&bfin_wdt_notifier);
+}
+
+module_init(bfin_wdt_init);
+module_exit(bfin_wdt_exit);
+
+MODULE_AUTHOR("Michele d'Amico, Mike Frysinger <vapier@...too.org>");
+MODULE_DESCRIPTION("Blackfin Watchdog Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+module_param(action, uint, 0);
+MODULE_PARM_DESC(action, "Watchdog timeout action: 0 for reboot, 1 for NMI, 2 for General Purpose Interrupt, 3 for none (default=" __MODULE_STRING(WATCHDOG_ACTION) ")");
--
1.5.2
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