linux/drivers/watchdog/digicolor_wdt.c
Guenter Roeck 0f0a6a285e 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>
2019-05-05 21:02:12 +02:00

171 lines
3.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Watchdog driver for Conexant Digicolor
*
* Copyright (C) 2015 Paradox Innovation Ltd.
*
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#define TIMER_A_CONTROL 0
#define TIMER_A_COUNT 4
#define TIMER_A_ENABLE_COUNT BIT(0)
#define TIMER_A_ENABLE_WATCHDOG BIT(1)
struct dc_wdt {
void __iomem *base;
struct clk *clk;
spinlock_t lock;
};
static unsigned timeout;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
static void dc_wdt_set(struct dc_wdt *wdt, u32 ticks)
{
unsigned long flags;
spin_lock_irqsave(&wdt->lock, flags);
writel_relaxed(0, wdt->base + TIMER_A_CONTROL);
writel_relaxed(ticks, wdt->base + TIMER_A_COUNT);
writel_relaxed(TIMER_A_ENABLE_COUNT | TIMER_A_ENABLE_WATCHDOG,
wdt->base + TIMER_A_CONTROL);
spin_unlock_irqrestore(&wdt->lock, flags);
}
static int dc_wdt_restart(struct watchdog_device *wdog, unsigned long action,
void *data)
{
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
dc_wdt_set(wdt, 1);
/* wait for reset to assert... */
mdelay(500);
return 0;
}
static int dc_wdt_start(struct watchdog_device *wdog)
{
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
dc_wdt_set(wdt, wdog->timeout * clk_get_rate(wdt->clk));
return 0;
}
static int dc_wdt_stop(struct watchdog_device *wdog)
{
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
writel_relaxed(0, wdt->base + TIMER_A_CONTROL);
return 0;
}
static int dc_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t)
{
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
dc_wdt_set(wdt, t * clk_get_rate(wdt->clk));
wdog->timeout = t;
return 0;
}
static unsigned int dc_wdt_get_timeleft(struct watchdog_device *wdog)
{
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
uint32_t count = readl_relaxed(wdt->base + TIMER_A_COUNT);
return count / clk_get_rate(wdt->clk);
}
static const struct watchdog_ops dc_wdt_ops = {
.owner = THIS_MODULE,
.start = dc_wdt_start,
.stop = dc_wdt_stop,
.set_timeout = dc_wdt_set_timeout,
.get_timeleft = dc_wdt_get_timeleft,
.restart = dc_wdt_restart,
};
static const struct watchdog_info dc_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
| WDIOF_KEEPALIVEPING,
.identity = "Conexant Digicolor Watchdog",
};
static struct watchdog_device dc_wdt_wdd = {
.info = &dc_wdt_info,
.ops = &dc_wdt_ops,
.min_timeout = 1,
};
static int dc_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dc_wdt *wdt;
int ret;
wdt = devm_kzalloc(dev, sizeof(struct dc_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);
wdt->clk = devm_clk_get(dev, NULL);
if (IS_ERR(wdt->clk))
return PTR_ERR(wdt->clk);
dc_wdt_wdd.max_timeout = U32_MAX / clk_get_rate(wdt->clk);
dc_wdt_wdd.timeout = dc_wdt_wdd.max_timeout;
dc_wdt_wdd.parent = dev;
spin_lock_init(&wdt->lock);
watchdog_set_drvdata(&dc_wdt_wdd, wdt);
watchdog_set_restart_priority(&dc_wdt_wdd, 128);
watchdog_init_timeout(&dc_wdt_wdd, timeout, dev);
watchdog_stop_on_reboot(&dc_wdt_wdd);
ret = devm_watchdog_register_device(dev, &dc_wdt_wdd);
if (ret) {
dev_err(dev, "Failed to register watchdog device");
return ret;
}
return 0;
}
static const struct of_device_id dc_wdt_of_match[] = {
{ .compatible = "cnxt,cx92755-wdt", },
{},
};
MODULE_DEVICE_TABLE(of, dc_wdt_of_match);
static struct platform_driver dc_wdt_driver = {
.probe = dc_wdt_probe,
.driver = {
.name = "digicolor-wdt",
.of_match_table = dc_wdt_of_match,
},
};
module_platform_driver(dc_wdt_driver);
MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
MODULE_DESCRIPTION("Driver for Conexant Digicolor watchdog timer");
MODULE_LICENSE("GPL");