mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
5870ac753b
Check for watchdog_ops structures that are only stored in the ops field of a watchdog_device structure. This field is declared const, so watchdog_ops structures that have this property can be declared as const also. This issue was detected using Coccinelle and the following semantic patch: @r disable optional_qualifier@ identifier i; position p; @@ static struct watchdog_ops i@p = { ... }; @ok@ identifier r.i; struct watchdog_device e; position p; @@ e.ops = &i@p; @bad@ position p != {r.p,ok.p}; identifier r.i; struct watchdog_ops e; @@ e@i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct watchdog_ops i = { ... }; Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
180 lines
4.3 KiB
C
180 lines
4.3 KiB
C
/*
|
|
* Watchdog driver for Technologic Systems TS-72xx based SBCs
|
|
* (TS-7200, TS-7250 and TS-7260). These boards have external
|
|
* glue logic CPLD chip, which includes programmable watchdog
|
|
* timer.
|
|
*
|
|
* Copyright (c) 2009 Mika Westerberg <mika.westerberg@iki.fi>
|
|
*
|
|
* This driver is based on ep93xx_wdt and wm831x_wdt drivers.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/io.h>
|
|
|
|
#define TS72XX_WDT_DEFAULT_TIMEOUT 30
|
|
|
|
static int timeout;
|
|
module_param(timeout, int, 0);
|
|
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
|
|
|
|
/* priv->control_reg */
|
|
#define TS72XX_WDT_CTRL_DISABLE 0x00
|
|
#define TS72XX_WDT_CTRL_250MS 0x01
|
|
#define TS72XX_WDT_CTRL_500MS 0x02
|
|
#define TS72XX_WDT_CTRL_1SEC 0x03
|
|
#define TS72XX_WDT_CTRL_RESERVED 0x04
|
|
#define TS72XX_WDT_CTRL_2SEC 0x05
|
|
#define TS72XX_WDT_CTRL_4SEC 0x06
|
|
#define TS72XX_WDT_CTRL_8SEC 0x07
|
|
|
|
/* priv->feed_reg */
|
|
#define TS72XX_WDT_FEED_VAL 0x05
|
|
|
|
struct ts72xx_wdt_priv {
|
|
void __iomem *control_reg;
|
|
void __iomem *feed_reg;
|
|
struct watchdog_device wdd;
|
|
unsigned char regval;
|
|
};
|
|
|
|
static int ts72xx_wdt_start(struct watchdog_device *wdd)
|
|
{
|
|
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
|
|
|
|
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
|
|
writeb(priv->regval, priv->control_reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ts72xx_wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
|
|
|
|
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
|
|
writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ts72xx_wdt_ping(struct watchdog_device *wdd)
|
|
{
|
|
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
|
|
|
|
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
|
|
{
|
|
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
|
|
|
|
if (to == 1) {
|
|
priv->regval = TS72XX_WDT_CTRL_1SEC;
|
|
} else if (to == 2) {
|
|
priv->regval = TS72XX_WDT_CTRL_2SEC;
|
|
} else if (to <= 4) {
|
|
priv->regval = TS72XX_WDT_CTRL_4SEC;
|
|
to = 4;
|
|
} else {
|
|
priv->regval = TS72XX_WDT_CTRL_8SEC;
|
|
if (to <= 8)
|
|
to = 8;
|
|
}
|
|
|
|
wdd->timeout = to;
|
|
|
|
if (watchdog_active(wdd)) {
|
|
ts72xx_wdt_stop(wdd);
|
|
ts72xx_wdt_start(wdd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_info ts72xx_wdt_ident = {
|
|
.options = WDIOF_KEEPALIVEPING |
|
|
WDIOF_SETTIMEOUT |
|
|
WDIOF_MAGICCLOSE,
|
|
.firmware_version = 1,
|
|
.identity = "TS-72XX WDT",
|
|
};
|
|
|
|
static const struct watchdog_ops ts72xx_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = ts72xx_wdt_start,
|
|
.stop = ts72xx_wdt_stop,
|
|
.ping = ts72xx_wdt_ping,
|
|
.set_timeout = ts72xx_wdt_settimeout,
|
|
};
|
|
|
|
static int ts72xx_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct ts72xx_wdt_priv *priv;
|
|
struct watchdog_device *wdd;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
priv->control_reg = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(priv->control_reg))
|
|
return PTR_ERR(priv->control_reg);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
priv->feed_reg = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(priv->feed_reg))
|
|
return PTR_ERR(priv->feed_reg);
|
|
|
|
wdd = &priv->wdd;
|
|
wdd->info = &ts72xx_wdt_ident;
|
|
wdd->ops = &ts72xx_wdt_ops;
|
|
wdd->min_timeout = 1;
|
|
wdd->max_hw_heartbeat_ms = 8000;
|
|
wdd->parent = &pdev->dev;
|
|
|
|
watchdog_set_nowayout(wdd, nowayout);
|
|
|
|
wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
|
|
watchdog_init_timeout(wdd, timeout, &pdev->dev);
|
|
|
|
watchdog_set_drvdata(wdd, priv);
|
|
|
|
ret = devm_watchdog_register_device(&pdev->dev, wdd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ts72xx_wdt_driver = {
|
|
.probe = ts72xx_wdt_probe,
|
|
.driver = {
|
|
.name = "ts72xx-wdt",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(ts72xx_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
|
|
MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ts72xx-wdt");
|