2009-11-29 22:58:38 +08:00
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/*
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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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2017-02-01 00:33:30 +08:00
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#include <linux/module.h>
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2009-11-29 22:58:38 +08:00
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#include <linux/watchdog.h>
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2017-02-01 00:33:30 +08:00
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#include <linux/io.h>
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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#define TS72XX_WDT_DEFAULT_TIMEOUT 30
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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static int timeout;
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2009-11-29 22:58:38 +08:00
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module_param(timeout, int, 0);
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2017-02-01 00:33:30 +08:00
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
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2009-11-29 22:58:38 +08:00
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2012-03-05 23:51:11 +08:00
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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2009-11-29 22:58:38 +08:00
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MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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struct ts72xx_wdt_priv {
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2009-11-29 22:58:38 +08:00
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void __iomem *control_reg;
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void __iomem *feed_reg;
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2017-02-01 00:33:30 +08:00
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struct watchdog_device wdd;
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unsigned char regval;
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2009-11-29 22:58:38 +08:00
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};
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2017-02-01 00:33:30 +08:00
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static int ts72xx_wdt_start(struct watchdog_device *wdd)
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2009-11-29 22:58:38 +08:00
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{
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2017-02-01 00:33:30 +08:00
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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return 0;
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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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static int ts72xx_wdt_stop(struct watchdog_device *wdd)
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2009-11-29 22:58:38 +08:00
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{
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2017-02-01 00:33:30 +08:00
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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return 0;
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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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static int ts72xx_wdt_ping(struct watchdog_device *wdd)
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2009-11-29 22:58:38 +08:00
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{
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2017-02-01 00:33:30 +08:00
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struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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return 0;
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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
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2009-11-29 22:58:38 +08:00
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{
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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} else {
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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wdd->timeout = to;
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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return 0;
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2009-11-29 22:58:38 +08:00
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}
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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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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2017-07-08 08:18:40 +08:00
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static const struct watchdog_ops ts72xx_wdt_ops = {
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2009-11-29 22:58:38 +08:00
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.owner = THIS_MODULE,
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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};
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2012-11-20 02:21:41 +08:00
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static int ts72xx_wdt_probe(struct platform_device *pdev)
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2009-11-29 22:58:38 +08:00
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{
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2019-04-11 00:27:45 +08:00
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struct device *dev = &pdev->dev;
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2017-02-01 00:33:30 +08:00
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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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2009-11-29 22:58:38 +08:00
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2019-04-11 00:27:45 +08:00
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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2017-02-01 00:33:30 +08:00
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if (!priv)
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2009-11-29 22:58:38 +08:00
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return -ENOMEM;
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watchdog: Convert to use devm_platform_ioremap_resource
Use devm_platform_ioremap_resource to reduce source code size,
improve readability, and reduce the likelyhood of bugs.
The conversion was done automatically with coccinelle using the
following semantic patch.
@r@
identifier res, pdev;
expression a;
expression index;
expression e;
@@
<+...
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(e, res);
+ a = devm_platform_ioremap_resource(pdev, index);
...+>
@depends on r@
identifier r.res;
@@
- struct resource *res;
... when != res
@@
identifier res, pdev;
expression index;
expression a;
@@
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(&pdev->dev, res);
+ a = devm_platform_ioremap_resource(pdev, index);
Cc: Joel Stanley <joel@jms.id.au>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Keguang Zhang <keguang.zhang@gmail.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Avi Fishman <avifishman70@gmail.com>
Cc: Nancy Yuen <yuenn@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Sylvain Lemieux <slemieux.tyco@gmail.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Michal Simek <michal.simek@xilinx.com> (cadence/xilinx wdts)
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2019-04-03 03:01:53 +08:00
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priv->control_reg = devm_platform_ioremap_resource(pdev, 0);
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2017-02-01 00:33:30 +08:00
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if (IS_ERR(priv->control_reg))
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return PTR_ERR(priv->control_reg);
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2009-11-29 22:58:38 +08:00
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watchdog: Convert to use devm_platform_ioremap_resource
Use devm_platform_ioremap_resource to reduce source code size,
improve readability, and reduce the likelyhood of bugs.
The conversion was done automatically with coccinelle using the
following semantic patch.
@r@
identifier res, pdev;
expression a;
expression index;
expression e;
@@
<+...
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(e, res);
+ a = devm_platform_ioremap_resource(pdev, index);
...+>
@depends on r@
identifier r.res;
@@
- struct resource *res;
... when != res
@@
identifier res, pdev;
expression index;
expression a;
@@
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(&pdev->dev, res);
+ a = devm_platform_ioremap_resource(pdev, index);
Cc: Joel Stanley <joel@jms.id.au>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Keguang Zhang <keguang.zhang@gmail.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Avi Fishman <avifishman70@gmail.com>
Cc: Nancy Yuen <yuenn@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Sylvain Lemieux <slemieux.tyco@gmail.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Michal Simek <michal.simek@xilinx.com> (cadence/xilinx wdts)
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2019-04-03 03:01:53 +08:00
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priv->feed_reg = devm_platform_ioremap_resource(pdev, 1);
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2017-02-01 00:33:30 +08:00
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if (IS_ERR(priv->feed_reg))
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return PTR_ERR(priv->feed_reg);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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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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2019-04-11 00:27:45 +08:00
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wdd->parent = dev;
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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watchdog_set_nowayout(wdd, nowayout);
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2010-08-29 18:53:14 +08:00
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2017-02-01 00:33:30 +08:00
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wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
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2019-04-11 00:27:45 +08:00
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watchdog_init_timeout(wdd, timeout, dev);
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2009-11-29 22:58:38 +08:00
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2017-02-01 00:33:30 +08:00
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watchdog_set_drvdata(wdd, priv);
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2009-11-29 22:58:38 +08:00
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2019-04-11 00:27:45 +08:00
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ret = devm_watchdog_register_device(dev, wdd);
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2017-02-01 00:33:30 +08:00
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if (ret)
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return ret;
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2019-04-11 00:27:45 +08:00
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dev_info(dev, "TS-72xx Watchdog driver\n");
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2009-11-29 22:58:38 +08:00
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2015-07-31 06:59:57 +08:00
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return 0;
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2009-11-29 22:58:38 +08:00
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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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2011-11-29 13:56:27 +08:00
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module_platform_driver(ts72xx_wdt_driver);
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2009-11-29 22:58:38 +08:00
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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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