2019-05-26 23:55:01 -07:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2014-09-20 10:06:50 -07:00
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/*
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* Meson Watchdog Driver
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*
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* Copyright (c) 2014 Carlo Caione
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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2023-07-26 16:33:00 -07:00
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#include <linux/mod_devicetable.h>
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2014-09-20 10:06:50 -07:00
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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2014-09-20 10:06:50 -07:00
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#define DRV_NAME "meson_wdt"
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#define MESON_WDT_TC 0x00
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#define MESON_WDT_DC_RESET (3 << 24)
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#define MESON_WDT_RESET 0x04
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#define MESON_WDT_TIMEOUT 30
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#define MESON_WDT_MIN_TIMEOUT 1
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#define MESON_SEC_TO_TC(s, c) ((s) * (c))
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static bool nowayout = WATCHDOG_NOWAYOUT;
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2018-02-11 13:08:46 -07:00
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static unsigned int timeout;
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2015-11-08 05:18:54 -07:00
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struct meson_wdt_data {
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unsigned int enable;
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unsigned int terminal_count_mask;
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unsigned int count_unit;
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};
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static struct meson_wdt_data meson6_wdt_data = {
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.enable = BIT(22),
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.terminal_count_mask = 0x3fffff,
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.count_unit = 100000, /* 10 us */
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};
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2015-11-08 05:18:55 -07:00
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static struct meson_wdt_data meson8b_wdt_data = {
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.enable = BIT(19),
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.terminal_count_mask = 0xffff,
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.count_unit = 7812, /* 128 us */
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};
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2014-09-20 10:06:50 -07:00
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struct meson_wdt_dev {
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struct watchdog_device wdt_dev;
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void __iomem *wdt_base;
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const struct meson_wdt_data *data;
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};
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2016-02-26 18:32:49 -07:00
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static int meson_wdt_restart(struct watchdog_device *wdt_dev,
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unsigned long action, void *data)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 tc_reboot = MESON_WDT_DC_RESET;
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tc_reboot |= meson_wdt->data->enable;
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while (1) {
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writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC);
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mdelay(5);
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}
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2015-11-16 10:28:06 -07:00
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return 0;
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}
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static int meson_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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writel(0, meson_wdt->wdt_base + MESON_WDT_RESET);
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return 0;
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}
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static void meson_wdt_change_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg &= ~meson_wdt->data->terminal_count_mask;
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reg |= MESON_SEC_TO_TC(timeout, meson_wdt->data->count_unit);
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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}
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static int meson_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int timeout)
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{
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wdt_dev->timeout = timeout;
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meson_wdt_change_timeout(wdt_dev, timeout);
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meson_wdt_ping(wdt_dev);
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return 0;
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}
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static int meson_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg &= ~meson_wdt->data->enable;
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2014-09-20 10:06:50 -07:00
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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return 0;
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}
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static int meson_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
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u32 reg;
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meson_wdt_change_timeout(wdt_dev, meson_wdt->wdt_dev.timeout);
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meson_wdt_ping(wdt_dev);
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reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
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reg |= meson_wdt->data->enable;
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writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
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return 0;
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}
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static const struct watchdog_info meson_wdt_info = {
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.identity = DRV_NAME,
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops meson_wdt_ops = {
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.owner = THIS_MODULE,
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.start = meson_wdt_start,
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.stop = meson_wdt_stop,
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.ping = meson_wdt_ping,
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.set_timeout = meson_wdt_set_timeout,
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.restart = meson_wdt_restart,
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};
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static const struct of_device_id meson_wdt_dt_ids[] = {
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{ .compatible = "amlogic,meson6-wdt", .data = &meson6_wdt_data },
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{ .compatible = "amlogic,meson8-wdt", .data = &meson6_wdt_data },
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{ .compatible = "amlogic,meson8b-wdt", .data = &meson8b_wdt_data },
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2017-07-11 15:14:38 -07:00
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{ .compatible = "amlogic,meson8m2-wdt", .data = &meson8b_wdt_data },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids);
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2014-09-20 10:06:50 -07:00
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static int meson_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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2014-09-20 10:06:50 -07:00
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struct meson_wdt_dev *meson_wdt;
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int err;
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2019-04-09 10:23:43 -07:00
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meson_wdt = devm_kzalloc(dev, sizeof(*meson_wdt), GFP_KERNEL);
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2014-09-20 10:06:50 -07:00
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if (!meson_wdt)
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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
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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 12:01:53 -07:00
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meson_wdt->wdt_base = devm_platform_ioremap_resource(pdev, 0);
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2014-09-20 10:06:50 -07:00
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if (IS_ERR(meson_wdt->wdt_base))
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return PTR_ERR(meson_wdt->wdt_base);
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2021-03-31 19:25:21 -07:00
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meson_wdt->data = device_get_match_data(dev);
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2015-11-08 05:18:54 -07:00
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2019-04-09 10:23:43 -07:00
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meson_wdt->wdt_dev.parent = dev;
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2014-09-20 10:06:50 -07:00
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meson_wdt->wdt_dev.info = &meson_wdt_info;
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meson_wdt->wdt_dev.ops = &meson_wdt_ops;
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2015-11-08 05:18:54 -07:00
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meson_wdt->wdt_dev.max_timeout =
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meson_wdt->data->terminal_count_mask / meson_wdt->data->count_unit;
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2014-09-20 10:06:50 -07:00
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meson_wdt->wdt_dev.min_timeout = MESON_WDT_MIN_TIMEOUT;
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2015-11-08 05:18:54 -07:00
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meson_wdt->wdt_dev.timeout = min_t(unsigned int,
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MESON_WDT_TIMEOUT,
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meson_wdt->wdt_dev.max_timeout);
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2014-09-20 10:06:50 -07:00
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watchdog_set_drvdata(&meson_wdt->wdt_dev, meson_wdt);
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2019-04-09 10:23:43 -07:00
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watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, dev);
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2014-09-20 10:06:50 -07:00
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watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout);
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2015-11-16 10:28:06 -07:00
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watchdog_set_restart_priority(&meson_wdt->wdt_dev, 128);
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2014-09-20 10:06:50 -07:00
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meson_wdt_stop(&meson_wdt->wdt_dev);
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2017-01-10 16:21:53 -07:00
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watchdog_stop_on_reboot(&meson_wdt->wdt_dev);
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2019-04-09 10:23:43 -07:00
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err = devm_watchdog_register_device(dev, &meson_wdt->wdt_dev);
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2014-09-20 10:06:50 -07:00
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if (err)
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return err;
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2019-04-09 10:23:43 -07:00
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dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
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2014-09-20 10:06:50 -07:00
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meson_wdt->wdt_dev.timeout, nowayout);
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return 0;
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}
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static struct platform_driver meson_wdt_driver = {
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.probe = meson_wdt_probe,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = meson_wdt_dt_ids,
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},
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};
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module_platform_driver(meson_wdt_driver);
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
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MODULE_DESCRIPTION("Meson Watchdog Timer Driver");
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