mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
f50a7f3d92
Based on 1 normalized pattern(s): licensed under gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 99 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.163048684@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
222 lines
5.4 KiB
C
222 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Watchdog driver for CSR Atlas7
|
|
*
|
|
* Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
#define ATLAS7_TIMER_WDT_INDEX 5
|
|
#define ATLAS7_WDT_DEFAULT_TIMEOUT 20
|
|
|
|
#define ATLAS7_WDT_CNT_CTRL (0 + 4 * ATLAS7_TIMER_WDT_INDEX)
|
|
#define ATLAS7_WDT_CNT_MATCH (0x18 + 4 * ATLAS7_TIMER_WDT_INDEX)
|
|
#define ATLAS7_WDT_CNT (0x48 + 4 * ATLAS7_TIMER_WDT_INDEX)
|
|
#define ATLAS7_WDT_CNT_EN (BIT(0) | BIT(1))
|
|
#define ATLAS7_WDT_EN 0x64
|
|
|
|
static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT;
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
|
|
module_param(timeout, uint, 0);
|
|
module_param(nowayout, bool, 0);
|
|
|
|
MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)");
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
struct atlas7_wdog {
|
|
struct device *dev;
|
|
void __iomem *base;
|
|
unsigned long tick_rate;
|
|
struct clk *clk;
|
|
};
|
|
|
|
static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd)
|
|
{
|
|
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
|
|
u32 counter, match, delta;
|
|
|
|
counter = readl(wdt->base + ATLAS7_WDT_CNT);
|
|
match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH);
|
|
delta = match - counter;
|
|
|
|
return delta / wdt->tick_rate;
|
|
}
|
|
|
|
static int atlas7_wdt_ping(struct watchdog_device *wdd)
|
|
{
|
|
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
|
|
u32 counter, match, delta;
|
|
|
|
counter = readl(wdt->base + ATLAS7_WDT_CNT);
|
|
delta = wdd->timeout * wdt->tick_rate;
|
|
match = counter + delta;
|
|
|
|
writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atlas7_wdt_enable(struct watchdog_device *wdd)
|
|
{
|
|
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
|
|
|
|
atlas7_wdt_ping(wdd);
|
|
|
|
writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN,
|
|
wdt->base + ATLAS7_WDT_CNT_CTRL);
|
|
writel(1, wdt->base + ATLAS7_WDT_EN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atlas7_wdt_disable(struct watchdog_device *wdd)
|
|
{
|
|
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
|
|
|
|
writel(0, wdt->base + ATLAS7_WDT_EN);
|
|
writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN,
|
|
wdt->base + ATLAS7_WDT_CNT_CTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
|
|
{
|
|
wdd->timeout = to;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
|
|
|
|
static const struct watchdog_info atlas7_wdt_ident = {
|
|
.options = OPTIONS,
|
|
.firmware_version = 0,
|
|
.identity = "atlas7 Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops atlas7_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = atlas7_wdt_enable,
|
|
.stop = atlas7_wdt_disable,
|
|
.get_timeleft = atlas7_wdt_gettimeleft,
|
|
.ping = atlas7_wdt_ping,
|
|
.set_timeout = atlas7_wdt_settimeout,
|
|
};
|
|
|
|
static struct watchdog_device atlas7_wdd = {
|
|
.info = &atlas7_wdt_ident,
|
|
.ops = &atlas7_wdt_ops,
|
|
.timeout = ATLAS7_WDT_DEFAULT_TIMEOUT,
|
|
};
|
|
|
|
static const struct of_device_id atlas7_wdt_ids[] = {
|
|
{ .compatible = "sirf,atlas7-tick"},
|
|
{}
|
|
};
|
|
|
|
static void atlas7_clk_disable_unprepare(void *data)
|
|
{
|
|
clk_disable_unprepare(data);
|
|
}
|
|
|
|
static int atlas7_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct atlas7_wdog *wdt;
|
|
struct clk *clk;
|
|
int ret;
|
|
|
|
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
wdt->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(wdt->base))
|
|
return PTR_ERR(wdt->base);
|
|
|
|
clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(clk))
|
|
return PTR_ERR(clk);
|
|
ret = clk_prepare_enable(clk);
|
|
if (ret) {
|
|
dev_err(dev, "clk enable failed\n");
|
|
return ret;
|
|
}
|
|
ret = devm_add_action_or_reset(dev, atlas7_clk_disable_unprepare, clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* disable watchdog hardware */
|
|
writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
|
|
|
|
wdt->tick_rate = clk_get_rate(clk);
|
|
if (!wdt->tick_rate)
|
|
return -EINVAL;
|
|
|
|
wdt->clk = clk;
|
|
atlas7_wdd.min_timeout = 1;
|
|
atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
|
|
|
|
watchdog_init_timeout(&atlas7_wdd, 0, dev);
|
|
watchdog_set_nowayout(&atlas7_wdd, nowayout);
|
|
|
|
watchdog_set_drvdata(&atlas7_wdd, wdt);
|
|
platform_set_drvdata(pdev, &atlas7_wdd);
|
|
|
|
watchdog_stop_on_reboot(&atlas7_wdd);
|
|
watchdog_stop_on_unregister(&atlas7_wdd);
|
|
return devm_watchdog_register_device(dev, &atlas7_wdd);
|
|
}
|
|
|
|
static int __maybe_unused atlas7_wdt_suspend(struct device *dev)
|
|
{
|
|
/*
|
|
* NOTE:timer controller registers settings are saved
|
|
* and restored back by the timer-atlas7.c
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused atlas7_wdt_resume(struct device *dev)
|
|
{
|
|
struct watchdog_device *wdd = dev_get_drvdata(dev);
|
|
|
|
/*
|
|
* NOTE: Since timer controller registers settings are saved
|
|
* and restored back by the timer-atlas7.c, so we need not
|
|
* update WD settings except refreshing timeout.
|
|
*/
|
|
atlas7_wdt_ping(wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops,
|
|
atlas7_wdt_suspend, atlas7_wdt_resume);
|
|
|
|
MODULE_DEVICE_TABLE(of, atlas7_wdt_ids);
|
|
|
|
static struct platform_driver atlas7_wdt_driver = {
|
|
.driver = {
|
|
.name = "atlas7-wdt",
|
|
.pm = &atlas7_wdt_pm_ops,
|
|
.of_match_table = atlas7_wdt_ids,
|
|
},
|
|
.probe = atlas7_wdt_probe,
|
|
};
|
|
module_platform_driver(atlas7_wdt_driver);
|
|
|
|
MODULE_DESCRIPTION("CSRatlas7 watchdog driver");
|
|
MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:atlas7-wdt");
|