2019-06-04 02:11:33 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2007-11-11 09:32:17 -07:00
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/*
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* txx9wdt: A Hardware Watchdog Driver for TXx9 SoCs
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*
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* Copyright (C) 2007 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
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*/
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2012-02-15 16:06:19 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2007-11-11 09:32:17 -07:00
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <asm/txx9tmr.h>
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2012-03-23 04:48:22 -06:00
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#define WD_TIMER_CCD 7 /* 1/256 */
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#define WD_TIMER_CLK (clk_get_rate(txx9_imclk) / (2 << WD_TIMER_CCD))
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#define WD_MAX_TIMEOUT ((0xffffffff >> (32 - TXX9_TIMER_BITS)) / WD_TIMER_CLK)
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2007-11-11 09:32:17 -07:00
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#define TIMER_MARGIN 60 /* Default is 60 seconds */
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2012-03-23 04:48:22 -06:00
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static unsigned int timeout = TIMER_MARGIN; /* in seconds */
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module_param(timeout, uint, 0);
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2007-11-11 09:32:17 -07:00
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. "
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"(0<timeout<((2^" __MODULE_STRING(TXX9_TIMER_BITS) ")/(IMCLK/256)), "
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"default=" __MODULE_STRING(TIMER_MARGIN) ")");
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2012-03-05 08:51:11 -07:00
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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2007-11-11 09:32:17 -07:00
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started "
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"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static struct txx9_tmr_reg __iomem *txx9wdt_reg;
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static struct clk *txx9_imclk;
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2008-08-08 09:18:46 -06:00
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static DEFINE_SPINLOCK(txx9_lock);
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2007-11-11 09:32:17 -07:00
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2012-03-15 21:53:53 -06:00
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static int txx9wdt_ping(struct watchdog_device *wdt_dev)
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2007-11-11 09:32:17 -07:00
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{
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2008-05-19 07:09:12 -06:00
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spin_lock(&txx9_lock);
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2007-11-11 09:32:17 -07:00
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__raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
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2008-05-19 07:09:12 -06:00
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spin_unlock(&txx9_lock);
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2012-03-15 21:53:53 -06:00
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return 0;
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2007-11-11 09:32:17 -07:00
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}
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2012-03-15 21:53:53 -06:00
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static int txx9wdt_start(struct watchdog_device *wdt_dev)
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2007-11-11 09:32:17 -07:00
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{
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2008-05-19 07:09:12 -06:00
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spin_lock(&txx9_lock);
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2012-03-23 04:48:22 -06:00
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__raw_writel(WD_TIMER_CLK * wdt_dev->timeout, &txx9wdt_reg->cpra);
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2007-11-11 09:32:17 -07:00
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__raw_writel(WD_TIMER_CCD, &txx9wdt_reg->ccdr);
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__raw_writel(0, &txx9wdt_reg->tisr); /* clear pending interrupt */
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__raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG,
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&txx9wdt_reg->tcr);
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__raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
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2008-05-19 07:09:12 -06:00
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spin_unlock(&txx9_lock);
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2012-03-15 21:53:53 -06:00
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return 0;
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2007-11-11 09:32:17 -07:00
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}
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2012-03-15 21:53:53 -06:00
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static int txx9wdt_stop(struct watchdog_device *wdt_dev)
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2007-11-11 09:32:17 -07:00
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{
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2008-05-19 07:09:12 -06:00
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spin_lock(&txx9_lock);
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2007-11-11 09:32:17 -07:00
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__raw_writel(TXx9_TMWTMR_WDIS, &txx9wdt_reg->wtmr);
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__raw_writel(__raw_readl(&txx9wdt_reg->tcr) & ~TXx9_TMTCR_TCE,
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&txx9wdt_reg->tcr);
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2008-05-19 07:09:12 -06:00
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spin_unlock(&txx9_lock);
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2007-11-11 09:32:17 -07:00
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return 0;
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}
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2012-03-15 21:53:53 -06:00
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static int txx9wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int new_timeout)
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2007-11-11 09:32:17 -07:00
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{
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2012-03-23 04:48:22 -06:00
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wdt_dev->timeout = new_timeout;
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2012-03-15 21:53:53 -06:00
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txx9wdt_stop(wdt_dev);
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txx9wdt_start(wdt_dev);
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return 0;
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2007-11-11 09:32:17 -07:00
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}
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2012-03-15 21:53:53 -06:00
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static const struct watchdog_info txx9wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "Hardware Watchdog for TXx9",
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};
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2007-11-11 09:32:17 -07:00
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2012-03-15 21:53:53 -06:00
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static const struct watchdog_ops txx9wdt_ops = {
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.owner = THIS_MODULE,
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.start = txx9wdt_start,
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.stop = txx9wdt_stop,
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.ping = txx9wdt_ping,
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.set_timeout = txx9wdt_set_timeout,
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2007-11-11 09:32:17 -07:00
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};
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2012-03-15 21:53:53 -06:00
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static struct watchdog_device txx9wdt = {
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.info = &txx9wdt_info,
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.ops = &txx9wdt_ops,
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2007-11-11 09:32:17 -07:00
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};
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static int __init txx9wdt_probe(struct platform_device *dev)
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{
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int ret;
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txx9_imclk = clk_get(NULL, "imbus_clk");
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if (IS_ERR(txx9_imclk)) {
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ret = PTR_ERR(txx9_imclk);
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txx9_imclk = NULL;
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goto exit;
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}
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2016-09-11 02:59:57 -06:00
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ret = clk_prepare_enable(txx9_imclk);
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2007-11-11 09:32:17 -07:00
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if (ret) {
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clk_put(txx9_imclk);
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txx9_imclk = NULL;
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goto exit;
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}
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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>
2019-04-02 13:01:53 -06:00
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txx9wdt_reg = devm_platform_ioremap_resource(dev, 0);
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2013-01-21 03:09:25 -07:00
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if (IS_ERR(txx9wdt_reg)) {
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ret = PTR_ERR(txx9wdt_reg);
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2007-11-11 09:32:17 -07:00
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goto exit;
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}
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2012-03-23 04:48:22 -06:00
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if (timeout < 1 || timeout > WD_MAX_TIMEOUT)
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timeout = TIMER_MARGIN;
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txx9wdt.timeout = timeout;
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2012-03-15 21:53:53 -06:00
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txx9wdt.min_timeout = 1;
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txx9wdt.max_timeout = WD_MAX_TIMEOUT;
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2015-08-20 02:35:01 -06:00
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txx9wdt.parent = &dev->dev;
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2012-03-15 21:53:53 -06:00
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watchdog_set_nowayout(&txx9wdt, nowayout);
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ret = watchdog_register_device(&txx9wdt);
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if (ret)
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goto exit;
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2012-02-15 16:06:19 -07:00
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pr_info("Hardware Watchdog Timer: timeout=%d sec (max %ld) (nowayout= %d)\n",
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timeout, WD_MAX_TIMEOUT, nowayout);
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2007-11-11 09:32:17 -07:00
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return 0;
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exit:
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if (txx9_imclk) {
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2016-09-11 02:59:57 -06:00
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clk_disable_unprepare(txx9_imclk);
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2007-11-11 09:32:17 -07:00
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clk_put(txx9_imclk);
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}
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return ret;
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}
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static int __exit txx9wdt_remove(struct platform_device *dev)
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{
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2012-03-15 21:53:53 -06:00
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watchdog_unregister_device(&txx9wdt);
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2016-09-11 02:59:57 -06:00
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clk_disable_unprepare(txx9_imclk);
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2007-11-11 09:32:17 -07:00
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clk_put(txx9_imclk);
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return 0;
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}
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2009-12-26 12:13:00 -07:00
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static void txx9wdt_shutdown(struct platform_device *dev)
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{
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2012-03-15 21:53:53 -06:00
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txx9wdt_stop(&txx9wdt);
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2009-12-26 12:13:00 -07:00
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}
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2007-11-11 09:32:17 -07:00
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static struct platform_driver txx9wdt_driver = {
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.remove = __exit_p(txx9wdt_remove),
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2009-12-26 12:13:00 -07:00
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.shutdown = txx9wdt_shutdown,
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2007-11-11 09:32:17 -07:00
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.driver = {
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.name = "txx9wdt",
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},
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};
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2013-01-09 04:15:27 -07:00
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module_platform_driver_probe(txx9wdt_driver, txx9wdt_probe);
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2007-11-11 09:32:17 -07:00
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MODULE_DESCRIPTION("TXx9 Watchdog Driver");
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MODULE_LICENSE("GPL");
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2008-04-10 22:29:23 -06:00
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MODULE_ALIAS("platform:txx9wdt");
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