2018-03-16 15:14:11 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
|
2016-07-10 09:11:04 +00:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2016 BayLibre, SAS.
|
|
|
|
* Author: Neil Armstrong <narmstrong@baylibre.com>
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/watchdog.h>
|
|
|
|
|
|
|
|
#define DEFAULT_TIMEOUT 30 /* seconds */
|
|
|
|
|
|
|
|
#define GXBB_WDT_CTRL_REG 0x0
|
|
|
|
#define GXBB_WDT_TCNT_REG 0x8
|
|
|
|
#define GXBB_WDT_RSET_REG 0xc
|
|
|
|
|
|
|
|
#define GXBB_WDT_CTRL_CLKDIV_EN BIT(25)
|
|
|
|
#define GXBB_WDT_CTRL_CLK_EN BIT(24)
|
|
|
|
#define GXBB_WDT_CTRL_EE_RESET BIT(21)
|
|
|
|
#define GXBB_WDT_CTRL_EN BIT(18)
|
|
|
|
#define GXBB_WDT_CTRL_DIV_MASK (BIT(18) - 1)
|
|
|
|
|
|
|
|
#define GXBB_WDT_TCNT_SETUP_MASK (BIT(16) - 1)
|
|
|
|
#define GXBB_WDT_TCNT_CNT_SHIFT 16
|
|
|
|
|
|
|
|
struct meson_gxbb_wdt {
|
|
|
|
void __iomem *reg_base;
|
|
|
|
struct watchdog_device wdt_dev;
|
|
|
|
struct clk *clk;
|
|
|
|
};
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_start(struct watchdog_device *wdt_dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
|
|
|
|
writel(readl(data->reg_base + GXBB_WDT_CTRL_REG) | GXBB_WDT_CTRL_EN,
|
|
|
|
data->reg_base + GXBB_WDT_CTRL_REG);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_stop(struct watchdog_device *wdt_dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
|
|
|
|
writel(readl(data->reg_base + GXBB_WDT_CTRL_REG) & ~GXBB_WDT_CTRL_EN,
|
|
|
|
data->reg_base + GXBB_WDT_CTRL_REG);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_ping(struct watchdog_device *wdt_dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
|
|
|
|
writel(0, data->reg_base + GXBB_WDT_RSET_REG);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_set_timeout(struct watchdog_device *wdt_dev,
|
|
|
|
unsigned int timeout)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
unsigned long tcnt = timeout * 1000;
|
|
|
|
|
|
|
|
if (tcnt > GXBB_WDT_TCNT_SETUP_MASK)
|
|
|
|
tcnt = GXBB_WDT_TCNT_SETUP_MASK;
|
|
|
|
|
|
|
|
wdt_dev->timeout = timeout;
|
|
|
|
|
|
|
|
meson_gxbb_wdt_ping(wdt_dev);
|
|
|
|
|
|
|
|
writel(tcnt, data->reg_base + GXBB_WDT_TCNT_REG);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int meson_gxbb_wdt_get_timeleft(struct watchdog_device *wdt_dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = watchdog_get_drvdata(wdt_dev);
|
|
|
|
unsigned long reg;
|
|
|
|
|
|
|
|
reg = readl(data->reg_base + GXBB_WDT_TCNT_REG);
|
|
|
|
|
|
|
|
return ((reg >> GXBB_WDT_TCNT_CNT_SHIFT) -
|
|
|
|
(reg & GXBB_WDT_TCNT_SETUP_MASK)) / 1000;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct watchdog_ops meson_gxbb_wdt_ops = {
|
|
|
|
.start = meson_gxbb_wdt_start,
|
|
|
|
.stop = meson_gxbb_wdt_stop,
|
|
|
|
.ping = meson_gxbb_wdt_ping,
|
|
|
|
.set_timeout = meson_gxbb_wdt_set_timeout,
|
|
|
|
.get_timeleft = meson_gxbb_wdt_get_timeleft,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct watchdog_info meson_gxbb_wdt_info = {
|
|
|
|
.identity = "Meson GXBB Watchdog",
|
|
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __maybe_unused meson_gxbb_wdt_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (watchdog_active(&data->wdt_dev))
|
|
|
|
meson_gxbb_wdt_start(&data->wdt_dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __maybe_unused meson_gxbb_wdt_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (watchdog_active(&data->wdt_dev))
|
|
|
|
meson_gxbb_wdt_stop(&data->wdt_dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct dev_pm_ops meson_gxbb_wdt_pm_ops = {
|
|
|
|
SET_SYSTEM_SLEEP_PM_OPS(meson_gxbb_wdt_suspend, meson_gxbb_wdt_resume)
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct of_device_id meson_gxbb_wdt_dt_ids[] = {
|
|
|
|
{ .compatible = "amlogic,meson-gxbb-wdt", },
|
|
|
|
{ /* sentinel */ },
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, meson_gxbb_wdt_dt_ids);
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
|
|
|
if (!data)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
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>
2019-04-02 19:01:53 +00:00
|
|
|
data->reg_base = devm_platform_ioremap_resource(pdev, 0);
|
2016-07-10 09:11:04 +00:00
|
|
|
if (IS_ERR(data->reg_base))
|
|
|
|
return PTR_ERR(data->reg_base);
|
|
|
|
|
|
|
|
data->clk = devm_clk_get(&pdev->dev, NULL);
|
|
|
|
if (IS_ERR(data->clk))
|
|
|
|
return PTR_ERR(data->clk);
|
|
|
|
|
2017-06-07 09:34:15 +00:00
|
|
|
ret = clk_prepare_enable(data->clk);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
2016-07-10 09:11:04 +00:00
|
|
|
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
|
|
|
|
data->wdt_dev.parent = &pdev->dev;
|
|
|
|
data->wdt_dev.info = &meson_gxbb_wdt_info;
|
|
|
|
data->wdt_dev.ops = &meson_gxbb_wdt_ops;
|
|
|
|
data->wdt_dev.max_hw_heartbeat_ms = GXBB_WDT_TCNT_SETUP_MASK;
|
|
|
|
data->wdt_dev.min_timeout = 1;
|
|
|
|
data->wdt_dev.timeout = DEFAULT_TIMEOUT;
|
|
|
|
watchdog_set_drvdata(&data->wdt_dev, data);
|
|
|
|
|
|
|
|
/* Setup with 1ms timebase */
|
|
|
|
writel(((clk_get_rate(data->clk) / 1000) & GXBB_WDT_CTRL_DIV_MASK) |
|
|
|
|
GXBB_WDT_CTRL_EE_RESET |
|
|
|
|
GXBB_WDT_CTRL_CLK_EN |
|
|
|
|
GXBB_WDT_CTRL_CLKDIV_EN,
|
|
|
|
data->reg_base + GXBB_WDT_CTRL_REG);
|
|
|
|
|
|
|
|
meson_gxbb_wdt_set_timeout(&data->wdt_dev, data->wdt_dev.timeout);
|
|
|
|
|
|
|
|
ret = watchdog_register_device(&data->wdt_dev);
|
|
|
|
if (ret) {
|
|
|
|
clk_disable_unprepare(data->clk);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int meson_gxbb_wdt_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
watchdog_unregister_device(&data->wdt_dev);
|
|
|
|
|
|
|
|
clk_disable_unprepare(data->clk);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void meson_gxbb_wdt_shutdown(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct meson_gxbb_wdt *data = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
meson_gxbb_wdt_stop(&data->wdt_dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver meson_gxbb_wdt_driver = {
|
|
|
|
.probe = meson_gxbb_wdt_probe,
|
|
|
|
.remove = meson_gxbb_wdt_remove,
|
|
|
|
.shutdown = meson_gxbb_wdt_shutdown,
|
|
|
|
.driver = {
|
|
|
|
.name = "meson-gxbb-wdt",
|
|
|
|
.pm = &meson_gxbb_wdt_pm_ops,
|
|
|
|
.of_match_table = meson_gxbb_wdt_dt_ids,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(meson_gxbb_wdt_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
|
|
|
|
MODULE_DESCRIPTION("Amlogic Meson GXBB Watchdog timer driver");
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|