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>
This commit is contained in:
Kyle Roeschley
Wim Van Sebroeck
Родитель
4d8b229d5e
Коммит
70f3997667
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@ -200,6 +200,11 @@ mv64x60_wdt:
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nowayout: Watchdog cannot be stopped once started
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(default=kernel config parameter)
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-------------------------------------------------
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ni903x_wdt:
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timeout: Initial watchdog timeout in seconds (0<timeout<516, default=60)
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nowayout: Watchdog cannot be stopped once started
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(default=kernel config parameter)
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-------------------------------------------------
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nuc900_wdt:
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heartbeat: Watchdog heartbeats in seconds.
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(default = 15)
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@ -1217,6 +1217,17 @@ config SBC_EPX_C3_WATCHDOG
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To compile this driver as a module, choose M here: the
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module will be called sbc_epx_c3.
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config NI903X_WDT
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tristate "NI 903x/913x Watchdog"
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depends on X86 && ACPI
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select WATCHDOG_CORE
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---help---
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This is the driver for the watchdog timer on the National Instruments
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903x/913x real-time controllers.
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To compile this driver as a module, choose M here: the module will be
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called ni903x_wdt.
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# M32R Architecture
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# M68K Architecture
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@ -126,6 +126,7 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o
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obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
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obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
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obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o
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obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
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# M32R Architecture
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@ -0,0 +1,270 @@
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/*
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* Copyright (C) 2016 National Instruments Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#define NIWD_CONTROL 0x01
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#define NIWD_COUNTER2 0x02
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#define NIWD_COUNTER1 0x03
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#define NIWD_COUNTER0 0x04
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#define NIWD_SEED2 0x05
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#define NIWD_SEED1 0x06
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#define NIWD_SEED0 0x07
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#define NIWD_IO_SIZE 0x08
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#define NIWD_CONTROL_MODE 0x80
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#define NIWD_CONTROL_PROC_RESET 0x20
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#define NIWD_CONTROL_PET 0x10
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#define NIWD_CONTROL_RUNNING 0x08
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#define NIWD_CONTROL_CAPTURECOUNTER 0x04
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#define NIWD_CONTROL_RESET 0x02
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#define NIWD_CONTROL_ALARM 0x01
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#define NIWD_PERIOD_NS 30720
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#define NIWD_MIN_TIMEOUT 1
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#define NIWD_MAX_TIMEOUT 515
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#define NIWD_DEFAULT_TIMEOUT 60
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#define NIWD_NAME "ni903x_wdt"
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struct ni903x_wdt {
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struct device *dev;
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u16 io_base;
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struct watchdog_device wdd;
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};
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static unsigned int timeout;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. (default="
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__MODULE_STRING(NIWD_DEFAULT_TIMEOUT) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, S_IRUGO);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static void ni903x_start(struct ni903x_wdt *wdt)
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{
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u8 control = inb(wdt->io_base + NIWD_CONTROL);
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outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);
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outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);
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}
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static int ni903x_wdd_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);
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u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS);
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outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2);
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outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1);
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outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0);
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wdd->timeout = timeout;
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return 0;
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}
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static unsigned int ni903x_wdd_get_timeleft(struct watchdog_device *wdd)
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{
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);
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u8 control, counter0, counter1, counter2;
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u32 counter;
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control = inb(wdt->io_base + NIWD_CONTROL);
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control |= NIWD_CONTROL_CAPTURECOUNTER;
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outb(control, wdt->io_base + NIWD_CONTROL);
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counter2 = inb(wdt->io_base + NIWD_COUNTER2);
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counter1 = inb(wdt->io_base + NIWD_COUNTER1);
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counter0 = inb(wdt->io_base + NIWD_COUNTER0);
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counter = (counter2 << 16) | (counter1 << 8) | counter0;
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return counter / (1000000000 / NIWD_PERIOD_NS);
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}
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static int ni903x_wdd_ping(struct watchdog_device *wdd)
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{
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);
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u8 control;
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control = inb(wdt->io_base + NIWD_CONTROL);
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outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);
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return 0;
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}
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static int ni903x_wdd_start(struct watchdog_device *wdd)
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{
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);
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outb(NIWD_CONTROL_RESET | NIWD_CONTROL_PROC_RESET,
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wdt->io_base + NIWD_CONTROL);
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ni903x_wdd_set_timeout(wdd, wdd->timeout);
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ni903x_start(wdt);
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return 0;
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}
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static int ni903x_wdd_stop(struct watchdog_device *wdd)
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{
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);
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outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);
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return 0;
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}
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static acpi_status ni903x_resources(struct acpi_resource *res, void *data)
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{
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struct ni903x_wdt *wdt = data;
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u16 io_size;
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switch (res->type) {
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case ACPI_RESOURCE_TYPE_IO:
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if (wdt->io_base != 0) {
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dev_err(wdt->dev, "too many IO resources\n");
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return AE_ERROR;
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}
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wdt->io_base = res->data.io.minimum;
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io_size = res->data.io.address_length;
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if (io_size < NIWD_IO_SIZE) {
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dev_err(wdt->dev, "memory region too small\n");
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return AE_ERROR;
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}
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if (!devm_request_region(wdt->dev, wdt->io_base, io_size,
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NIWD_NAME)) {
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dev_err(wdt->dev, "failed to get memory region\n");
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return AE_ERROR;
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}
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return AE_OK;
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case ACPI_RESOURCE_TYPE_END_TAG:
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default:
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/* Ignore unsupported resources, e.g. IRQ */
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return AE_OK;
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}
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}
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static const struct watchdog_info ni903x_wdd_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "NI Watchdog",
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};
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static const struct watchdog_ops ni903x_wdd_ops = {
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.owner = THIS_MODULE,
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.start = ni903x_wdd_start,
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.stop = ni903x_wdd_stop,
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.ping = ni903x_wdd_ping,
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.set_timeout = ni903x_wdd_set_timeout,
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.get_timeleft = ni903x_wdd_get_timeleft,
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};
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static int ni903x_acpi_add(struct acpi_device *device)
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{
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struct device *dev = &device->dev;
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struct watchdog_device *wdd;
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struct ni903x_wdt *wdt;
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acpi_status status;
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int ret;
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wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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device->driver_data = wdt;
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wdt->dev = dev;
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status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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ni903x_resources, wdt);
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if (ACPI_FAILURE(status) || wdt->io_base == 0) {
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dev_err(dev, "failed to get resources\n");
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return -ENODEV;
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}
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wdd = &wdt->wdd;
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wdd->info = &ni903x_wdd_info;
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wdd->ops = &ni903x_wdd_ops;
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wdd->min_timeout = NIWD_MIN_TIMEOUT;
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wdd->max_timeout = NIWD_MAX_TIMEOUT;
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wdd->timeout = NIWD_DEFAULT_TIMEOUT;
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wdd->parent = dev;
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watchdog_set_drvdata(wdd, wdt);
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watchdog_set_nowayout(wdd, nowayout);
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ret = watchdog_init_timeout(wdd, timeout, dev);
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if (ret)
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dev_err(dev, "unable to set timeout value, using default\n");
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ret = watchdog_register_device(wdd);
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if (ret) {
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dev_err(dev, "failed to register watchdog\n");
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return ret;
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}
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/* Switch from boot mode to user mode */
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outb(NIWD_CONTROL_RESET | NIWD_CONTROL_MODE,
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wdt->io_base + NIWD_CONTROL);
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dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",
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wdt->io_base, timeout, nowayout);
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return 0;
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}
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static int ni903x_acpi_remove(struct acpi_device *device)
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{
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struct ni903x_wdt *wdt = acpi_driver_data(device);
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ni903x_wdd_stop(&wdt->wdd);
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watchdog_unregister_device(&wdt->wdd);
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return 0;
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}
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static const struct acpi_device_id ni903x_device_ids[] = {
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{"NIC775C", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, ni903x_device_ids);
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static struct acpi_driver ni903x_acpi_driver = {
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.name = NIWD_NAME,
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.ids = ni903x_device_ids,
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.ops = {
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.add = ni903x_acpi_add,
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.remove = ni903x_acpi_remove,
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},
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};
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module_acpi_driver(ni903x_acpi_driver);
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MODULE_DESCRIPTION("NI 903x Watchdog");
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MODULE_AUTHOR("Jeff Westfahl <jeff.westfahl@ni.com>");
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MODULE_AUTHOR("Kyle Roeschley <kyle.roeschley@ni.com>");
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MODULE_LICENSE("GPL");
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