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Message-Id: <20230301065510.2818425-1-sergio.paracuellos@gmail.com>
Date: Wed, 1 Mar 2023 07:55:09 +0100
From: Sergio Paracuellos <sergio.paracuellos@...il.com>
To: linux-watchdog@...r.kernel.org
Cc: wim@...ux-watchdog.org, linux@...ck-us.net,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] watchdog: rt2880-wdt: avoid static global declarations
Instead of using static global definitions in driver code, refactor code
introducing a new watchdog driver data structure and use it along the code.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
drivers/watchdog/rt2880_wdt.c | 89 ++++++++++++++++++++---------------
1 file changed, 50 insertions(+), 39 deletions(-)
diff --git a/drivers/watchdog/rt2880_wdt.c b/drivers/watchdog/rt2880_wdt.c
index 49aff800824d..e54737bcf939 100644
--- a/drivers/watchdog/rt2880_wdt.c
+++ b/drivers/watchdog/rt2880_wdt.c
@@ -40,10 +40,13 @@
#define TMR1CTL_PRESCALE_MASK 0xf
#define TMR1CTL_PRESCALE_65536 0xf
-static struct clk *rt288x_wdt_clk;
-static unsigned long rt288x_wdt_freq;
-static void __iomem *rt288x_wdt_base;
-static struct reset_control *rt288x_wdt_reset;
+struct rt2880_wdt_data {
+ void __iomem *base;
+ unsigned long freq;
+ struct clk *clk;
+ struct reset_control *rst;
+ struct watchdog_device wdt;
+};
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
@@ -51,52 +54,56 @@ MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-static inline void rt_wdt_w32(unsigned reg, u32 val)
+static inline void rt_wdt_w32(void __iomem *base, unsigned reg, u32 val)
{
- iowrite32(val, rt288x_wdt_base + reg);
+ iowrite32(val, base + reg);
}
-static inline u32 rt_wdt_r32(unsigned reg)
+static inline u32 rt_wdt_r32(void __iomem *base, unsigned reg)
{
- return ioread32(rt288x_wdt_base + reg);
+ return ioread32(base + reg);
}
static int rt288x_wdt_ping(struct watchdog_device *w)
{
- rt_wdt_w32(TIMER_REG_TMR1LOAD, w->timeout * rt288x_wdt_freq);
+ struct rt2880_wdt_data *drvdata = watchdog_get_drvdata(w);
+
+ rt_wdt_w32(drvdata->base, TIMER_REG_TMR1LOAD, w->timeout * drvdata->freq);
return 0;
}
static int rt288x_wdt_start(struct watchdog_device *w)
{
+ struct rt2880_wdt_data *drvdata = watchdog_get_drvdata(w);
u32 t;
- t = rt_wdt_r32(TIMER_REG_TMR1CTL);
+ t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);
t &= ~(TMR1CTL_MODE_MASK << TMR1CTL_MODE_SHIFT |
TMR1CTL_PRESCALE_MASK);
t |= (TMR1CTL_MODE_WDT << TMR1CTL_MODE_SHIFT |
TMR1CTL_PRESCALE_65536);
- rt_wdt_w32(TIMER_REG_TMR1CTL, t);
+ rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);
rt288x_wdt_ping(w);
- t = rt_wdt_r32(TIMER_REG_TMR1CTL);
+ t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);
t |= TMR1CTL_ENABLE;
- rt_wdt_w32(TIMER_REG_TMR1CTL, t);
+ rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);
return 0;
}
static int rt288x_wdt_stop(struct watchdog_device *w)
{
+ struct rt2880_wdt_data *drvdata = watchdog_get_drvdata(w);
u32 t;
rt288x_wdt_ping(w);
- t = rt_wdt_r32(TIMER_REG_TMR1CTL);
+ t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);
t &= ~TMR1CTL_ENABLE;
- rt_wdt_w32(TIMER_REG_TMR1CTL, t);
+ rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);
return 0;
}
@@ -130,41 +137,45 @@ static const struct watchdog_ops rt288x_wdt_ops = {
.set_timeout = rt288x_wdt_set_timeout,
};
-static struct watchdog_device rt288x_wdt_dev = {
- .info = &rt288x_wdt_info,
- .ops = &rt288x_wdt_ops,
- .min_timeout = 1,
-};
-
static int rt288x_wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct watchdog_device *wdt;
+ struct rt2880_wdt_data *drvdata;
int ret;
- rt288x_wdt_base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(rt288x_wdt_base))
- return PTR_ERR(rt288x_wdt_base);
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(drvdata->base))
+ return PTR_ERR(drvdata->base);
- rt288x_wdt_clk = devm_clk_get(dev, NULL);
- if (IS_ERR(rt288x_wdt_clk))
- return PTR_ERR(rt288x_wdt_clk);
+ drvdata->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(drvdata->clk))
+ return PTR_ERR(drvdata->clk);
- rt288x_wdt_reset = devm_reset_control_get_exclusive(dev, NULL);
- if (!IS_ERR(rt288x_wdt_reset))
- reset_control_deassert(rt288x_wdt_reset);
+ drvdata->rst = devm_reset_control_get_exclusive(dev, NULL);
+ if (!IS_ERR(drvdata->rst))
+ reset_control_deassert(drvdata->rst);
- rt288x_wdt_freq = clk_get_rate(rt288x_wdt_clk) / RALINK_WDT_PRESCALE;
+ drvdata->freq = clk_get_rate(drvdata->clk) / RALINK_WDT_PRESCALE;
- rt288x_wdt_dev.bootstatus = rt288x_wdt_bootcause();
- rt288x_wdt_dev.max_timeout = (0xfffful / rt288x_wdt_freq);
- rt288x_wdt_dev.parent = dev;
+ wdt = &drvdata->wdt;
+ wdt->info = &rt288x_wdt_info;
+ wdt->ops = &rt288x_wdt_ops;
+ wdt->min_timeout = 1;
+ wdt->max_timeout = (0xfffful / drvdata->freq);
+ wdt->parent = dev;
+ wdt->bootstatus = rt288x_wdt_bootcause();
- watchdog_init_timeout(&rt288x_wdt_dev, rt288x_wdt_dev.max_timeout,
- dev);
- watchdog_set_nowayout(&rt288x_wdt_dev, nowayout);
+ watchdog_init_timeout(wdt, wdt->max_timeout, dev);
+ watchdog_set_nowayout(wdt, nowayout);
+ watchdog_set_drvdata(wdt, drvdata);
- watchdog_stop_on_reboot(&rt288x_wdt_dev);
- ret = devm_watchdog_register_device(dev, &rt288x_wdt_dev);
+ watchdog_stop_on_reboot(wdt);
+ ret = devm_watchdog_register_device(dev, &drvdata->wdt);
if (!ret)
dev_info(dev, "Initialized\n");
--
2.25.1
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