178 lines
4.2 KiB
C
178 lines
4.2 KiB
C
/*
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* Watchdog driver for Technologic Systems TS-72xx based SBCs
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* (TS-7200, TS-7250 and TS-7260). These boards have external
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* glue logic CPLD chip, which includes programmable watchdog
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* timer.
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*
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* Copyright (c) 2009 Mika Westerberg <mika.westerberg@iki.fi>
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*
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* This driver is based on ep93xx_wdt and wm831x_wdt drivers.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#include <linux/io.h>
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#define TS72XX_WDT_DEFAULT_TIMEOUT 30
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static int timeout;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
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/* priv->control_reg */
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#define TS72XX_WDT_CTRL_DISABLE 0x00
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#define TS72XX_WDT_CTRL_250MS 0x01
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#define TS72XX_WDT_CTRL_500MS 0x02
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#define TS72XX_WDT_CTRL_1SEC 0x03
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#define TS72XX_WDT_CTRL_RESERVED 0x04
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#define TS72XX_WDT_CTRL_2SEC 0x05
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#define TS72XX_WDT_CTRL_4SEC 0x06
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#define TS72XX_WDT_CTRL_8SEC 0x07
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/* priv->feed_reg */
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#define TS72XX_WDT_FEED_VAL 0x05
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struct ts72xx_wdt_priv {
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void __iomem *control_reg;
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void __iomem *feed_reg;
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struct watchdog_device wdd;
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unsigned char regval;
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};
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static int ts72xx_wdt_start(struct watchdog_device *wdd)
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{
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
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writeb(priv->regval, priv->control_reg);
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return 0;
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}
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static int ts72xx_wdt_stop(struct watchdog_device *wdd)
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{
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
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writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
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return 0;
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}
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static int ts72xx_wdt_ping(struct watchdog_device *wdd)
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{
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
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return 0;
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}
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static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
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{
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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if (to == 1) {
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priv->regval = TS72XX_WDT_CTRL_1SEC;
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} else if (to == 2) {
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priv->regval = TS72XX_WDT_CTRL_2SEC;
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} else if (to <= 4) {
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priv->regval = TS72XX_WDT_CTRL_4SEC;
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to = 4;
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} else {
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priv->regval = TS72XX_WDT_CTRL_8SEC;
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if (to <= 8)
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to = 8;
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}
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wdd->timeout = to;
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if (watchdog_active(wdd)) {
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ts72xx_wdt_stop(wdd);
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ts72xx_wdt_start(wdd);
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}
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return 0;
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}
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static const struct watchdog_info ts72xx_wdt_ident = {
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "TS-72XX WDT",
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};
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static const struct watchdog_ops ts72xx_wdt_ops = {
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.owner = THIS_MODULE,
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.start = ts72xx_wdt_start,
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.stop = ts72xx_wdt_stop,
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.ping = ts72xx_wdt_ping,
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.set_timeout = ts72xx_wdt_settimeout,
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};
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static int ts72xx_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ts72xx_wdt_priv *priv;
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struct watchdog_device *wdd;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->control_reg = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(priv->control_reg))
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return PTR_ERR(priv->control_reg);
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priv->feed_reg = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(priv->feed_reg))
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return PTR_ERR(priv->feed_reg);
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wdd = &priv->wdd;
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wdd->info = &ts72xx_wdt_ident;
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wdd->ops = &ts72xx_wdt_ops;
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wdd->min_timeout = 1;
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wdd->max_hw_heartbeat_ms = 8000;
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wdd->parent = dev;
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watchdog_set_nowayout(wdd, nowayout);
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wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
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watchdog_init_timeout(wdd, timeout, dev);
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watchdog_set_drvdata(wdd, priv);
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ret = devm_watchdog_register_device(dev, wdd);
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if (ret)
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return ret;
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dev_info(dev, "TS-72xx Watchdog driver\n");
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return 0;
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}
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static struct platform_driver ts72xx_wdt_driver = {
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.probe = ts72xx_wdt_probe,
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.driver = {
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.name = "ts72xx-wdt",
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},
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};
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module_platform_driver(ts72xx_wdt_driver);
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MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
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MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ts72xx-wdt");
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