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author | Kyle Roeschley <kyle.roeschley@ni.com> | 2016-02-25 11:28:00 -0600 |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2016-03-01 16:25:39 +0100 |
commit | 70f3997667fb127333862977ba4fd3e855fbf617 (patch) | |
tree | 78e0f853571f83539f9620d68cd3bb34eb8b68e7 /drivers/watchdog | |
parent | 4d8b229d5ea610affe672e919021e9d02cd877da (diff) | |
download | linux-stable-70f3997667fb127333862977ba4fd3e855fbf617.tar.gz linux-stable-70f3997667fb127333862977ba4fd3e855fbf617.tar.bz2 linux-stable-70f3997667fb127333862977ba4fd3e855fbf617.zip |
watchdog: ni903x_wdt: Add NI 903x/913x watchdog driver
Add support for the watchdog timer on NI cRIO-903x and cDAQ-913x real-
time controllers.
Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r-- | drivers/watchdog/Kconfig | 11 | ||||
-rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
-rw-r--r-- | drivers/watchdog/ni903x_wdt.c | 270 |
3 files changed, 282 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 5f29f72f4691..6f9530318e14 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1217,6 +1217,17 @@ config SBC_EPX_C3_WATCHDOG To compile this driver as a module, choose M here: the module will be called sbc_epx_c3. +config NI903X_WDT + tristate "NI 903x/913x Watchdog" + depends on X86 && ACPI + select WATCHDOG_CORE + ---help--- + This is the driver for the watchdog timer on the National Instruments + 903x/913x real-time controllers. + + To compile this driver as a module, choose M here: the module will be + called ni903x_wdt. + # M32R Architecture # M68K Architecture diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index f566753256ab..5a23529091a0 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -126,6 +126,7 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o +obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o # M32R Architecture diff --git a/drivers/watchdog/ni903x_wdt.c b/drivers/watchdog/ni903x_wdt.c new file mode 100644 index 000000000000..dc67742e9018 --- /dev/null +++ b/drivers/watchdog/ni903x_wdt.c @@ -0,0 +1,270 @@ +/* + * Copyright (C) 2016 National Instruments Corp. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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. See the + * GNU General Public License for more details. + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/watchdog.h> + +#define NIWD_CONTROL 0x01 +#define NIWD_COUNTER2 0x02 +#define NIWD_COUNTER1 0x03 +#define NIWD_COUNTER0 0x04 +#define NIWD_SEED2 0x05 +#define NIWD_SEED1 0x06 +#define NIWD_SEED0 0x07 + +#define NIWD_IO_SIZE 0x08 + +#define NIWD_CONTROL_MODE 0x80 +#define NIWD_CONTROL_PROC_RESET 0x20 +#define NIWD_CONTROL_PET 0x10 +#define NIWD_CONTROL_RUNNING 0x08 +#define NIWD_CONTROL_CAPTURECOUNTER 0x04 +#define NIWD_CONTROL_RESET 0x02 +#define NIWD_CONTROL_ALARM 0x01 + +#define NIWD_PERIOD_NS 30720 +#define NIWD_MIN_TIMEOUT 1 +#define NIWD_MAX_TIMEOUT 515 +#define NIWD_DEFAULT_TIMEOUT 60 + +#define NIWD_NAME "ni903x_wdt" + +struct ni903x_wdt { + struct device *dev; + u16 io_base; + struct watchdog_device wdd; +}; + +static unsigned int timeout; +module_param(timeout, uint, 0); +MODULE_PARM_DESC(timeout, + "Watchdog timeout in seconds. (default=" + __MODULE_STRING(NIWD_DEFAULT_TIMEOUT) ")"); + +static int nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, int, S_IRUGO); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static void ni903x_start(struct ni903x_wdt *wdt) +{ + u8 control = inb(wdt->io_base + NIWD_CONTROL); + + outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); + outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); +} + +static int ni903x_wdd_set_timeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); + u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS); + + outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2); + outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1); + outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0); + + wdd->timeout = timeout; + + return 0; +} + +static unsigned int ni903x_wdd_get_timeleft(struct watchdog_device *wdd) +{ + struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); + u8 control, counter0, counter1, counter2; + u32 counter; + + control = inb(wdt->io_base + NIWD_CONTROL); + control |= NIWD_CONTROL_CAPTURECOUNTER; + outb(control, wdt->io_base + NIWD_CONTROL); + + counter2 = inb(wdt->io_base + NIWD_COUNTER2); + counter1 = inb(wdt->io_base + NIWD_COUNTER1); + counter0 = inb(wdt->io_base + NIWD_COUNTER0); + + counter = (counter2 << 16) | (counter1 << 8) | counter0; + + return counter / (1000000000 / NIWD_PERIOD_NS); +} + +static int ni903x_wdd_ping(struct watchdog_device *wdd) +{ + struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); + u8 control; + + control = inb(wdt->io_base + NIWD_CONTROL); + outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); + + return 0; +} + +static int ni903x_wdd_start(struct watchdog_device *wdd) +{ + struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); + + outb(NIWD_CONTROL_RESET | NIWD_CONTROL_PROC_RESET, + wdt->io_base + NIWD_CONTROL); + + ni903x_wdd_set_timeout(wdd, wdd->timeout); + ni903x_start(wdt); + + return 0; +} + +static int ni903x_wdd_stop(struct watchdog_device *wdd) +{ + struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); + + outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); + + return 0; +} + +static acpi_status ni903x_resources(struct acpi_resource *res, void *data) +{ + struct ni903x_wdt *wdt = data; + u16 io_size; + + switch (res->type) { + case ACPI_RESOURCE_TYPE_IO: + if (wdt->io_base != 0) { + dev_err(wdt->dev, "too many IO resources\n"); + return AE_ERROR; + } + + wdt->io_base = res->data.io.minimum; + io_size = res->data.io.address_length; + + if (io_size < NIWD_IO_SIZE) { + dev_err(wdt->dev, "memory region too small\n"); + return AE_ERROR; + } + + if (!devm_request_region(wdt->dev, wdt->io_base, io_size, + NIWD_NAME)) { + dev_err(wdt->dev, "failed to get memory region\n"); + return AE_ERROR; + } + + return AE_OK; + + case ACPI_RESOURCE_TYPE_END_TAG: + default: + /* Ignore unsupported resources, e.g. IRQ */ + return AE_OK; + } +} + +static const struct watchdog_info ni903x_wdd_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, + .identity = "NI Watchdog", +}; + +static const struct watchdog_ops ni903x_wdd_ops = { + .owner = THIS_MODULE, + .start = ni903x_wdd_start, + .stop = ni903x_wdd_stop, + .ping = ni903x_wdd_ping, + .set_timeout = ni903x_wdd_set_timeout, + .get_timeleft = ni903x_wdd_get_timeleft, +}; + +static int ni903x_acpi_add(struct acpi_device *device) +{ + struct device *dev = &device->dev; + struct watchdog_device *wdd; + struct ni903x_wdt *wdt; + acpi_status status; + int ret; + + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) + return -ENOMEM; + + device->driver_data = wdt; + wdt->dev = dev; + + status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, + ni903x_resources, wdt); + if (ACPI_FAILURE(status) || wdt->io_base == 0) { + dev_err(dev, "failed to get resources\n"); + return -ENODEV; + } + + wdd = &wdt->wdd; + wdd->info = &ni903x_wdd_info; + wdd->ops = &ni903x_wdd_ops; + wdd->min_timeout = NIWD_MIN_TIMEOUT; + wdd->max_timeout = NIWD_MAX_TIMEOUT; + wdd->timeout = NIWD_DEFAULT_TIMEOUT; + wdd->parent = dev; + watchdog_set_drvdata(wdd, wdt); + watchdog_set_nowayout(wdd, nowayout); + ret = watchdog_init_timeout(wdd, timeout, dev); + if (ret) + dev_err(dev, "unable to set timeout value, using default\n"); + + ret = watchdog_register_device(wdd); + if (ret) { + dev_err(dev, "failed to register watchdog\n"); + return ret; + } + + /* Switch from boot mode to user mode */ + outb(NIWD_CONTROL_RESET | NIWD_CONTROL_MODE, + wdt->io_base + NIWD_CONTROL); + + dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n", + wdt->io_base, timeout, nowayout); + + return 0; +} + +static int ni903x_acpi_remove(struct acpi_device *device) +{ + struct ni903x_wdt *wdt = acpi_driver_data(device); + + ni903x_wdd_stop(&wdt->wdd); + watchdog_unregister_device(&wdt->wdd); + + return 0; +} + +static const struct acpi_device_id ni903x_device_ids[] = { + {"NIC775C", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, ni903x_device_ids); + +static struct acpi_driver ni903x_acpi_driver = { + .name = NIWD_NAME, + .ids = ni903x_device_ids, + .ops = { + .add = ni903x_acpi_add, + .remove = ni903x_acpi_remove, + }, +}; + +module_acpi_driver(ni903x_acpi_driver); + +MODULE_DESCRIPTION("NI 903x Watchdog"); +MODULE_AUTHOR("Jeff Westfahl <jeff.westfahl@ni.com>"); +MODULE_AUTHOR("Kyle Roeschley <kyle.roeschley@ni.com>"); +MODULE_LICENSE("GPL"); |