watchdog: s3c2410_wdt: remove the global variables

This patch removes the global variables in the driver file and
group them into a structure.

Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 128 insertions, 94 deletions

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 6a22cf5d35bd..43d280718709 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -84,13 +84,17 @@ MODULE_PARM_DESC(soft_noboot, "Watchdog action, set to 1 to ignore reboots, "
 			"0 to reboot (default 0)");
 MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
 
-static struct device    *wdt_dev;	/* platform device attached to */
-static struct resource	*wdt_mem;
-static struct resource	*wdt_irq;
-static struct clk	*wdt_clock;
-static void __iomem	*wdt_base;
-static unsigned int	 wdt_count;
-static DEFINE_SPINLOCK(wdt_lock);
+struct s3c2410_wdt {
+	struct device		*dev;
+	struct clk		*clock;
+	void __iomem		*reg_base;
+	unsigned int		count;
+	spinlock_t		lock;
+	unsigned long		wtcon_save;
+	unsigned long		wtdat_save;
+	struct watchdog_device	wdt_device;
+	struct notifier_block	freq_transition;
+};
 
 /* watchdog control routines */
 
@@ -102,29 +106,38 @@ do {							\
 
 /* functions */
 
+static inline struct s3c2410_wdt *freq_to_wdt(struct notifier_block *nb)
+{
+	return container_of(nb, struct s3c2410_wdt, freq_transition);
+}
+
 static int s3c2410wdt_keepalive(struct watchdog_device *wdd)
 {
-	spin_lock(&wdt_lock);
-	writel(wdt_count, wdt_base + S3C2410_WTCNT);
-	spin_unlock(&wdt_lock);
+	struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
+
+	spin_lock(&wdt->lock);
+	writel(wdt->count, wdt->reg_base + S3C2410_WTCNT);
+	spin_unlock(&wdt->lock);
 
 	return 0;
 }
 
-static void __s3c2410wdt_stop(void)
+static void __s3c2410wdt_stop(struct s3c2410_wdt *wdt)
 {
 	unsigned long wtcon;
 
-	wtcon = readl(wdt_base + S3C2410_WTCON);
+	wtcon = readl(wdt->reg_base + S3C2410_WTCON);
 	wtcon &= ~(S3C2410_WTCON_ENABLE | S3C2410_WTCON_RSTEN);
-	writel(wtcon, wdt_base + S3C2410_WTCON);
+	writel(wtcon, wdt->reg_base + S3C2410_WTCON);
 }
 
 static int s3c2410wdt_stop(struct watchdog_device *wdd)
 {
-	spin_lock(&wdt_lock);
-	__s3c2410wdt_stop();
-	spin_unlock(&wdt_lock);
+	struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
+
+	spin_lock(&wdt->lock);
+	__s3c2410wdt_stop(wdt);
+	spin_unlock(&wdt->lock);
 
 	return 0;
 }
@@ -132,12 +145,13 @@ static int s3c2410wdt_stop(struct watchdog_device *wdd)
 static int s3c2410wdt_start(struct watchdog_device *wdd)
 {
 	unsigned long wtcon;
+	struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
 
-	spin_lock(&wdt_lock);
+	spin_lock(&wdt->lock);
 
-	__s3c2410wdt_stop();
+	__s3c2410wdt_stop(wdt);
 
-	wtcon = readl(wdt_base + S3C2410_WTCON);
+	wtcon = readl(wdt->reg_base + S3C2410_WTCON);
 	wtcon |= S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128;
 
 	if (soft_noboot) {
@@ -148,25 +162,26 @@ static int s3c2410wdt_start(struct watchdog_device *wdd)
 		wtcon |= S3C2410_WTCON_RSTEN;
 	}
 
-	DBG("%s: wdt_count=0x%08x, wtcon=%08lx\n",
-	    __func__, wdt_count, wtcon);
+	DBG("%s: count=0x%08x, wtcon=%08lx\n",
+	    __func__, wdt->count, wtcon);
 
-	writel(wdt_count, wdt_base + S3C2410_WTDAT);
-	writel(wdt_count, wdt_base + S3C2410_WTCNT);
-	writel(wtcon, wdt_base + S3C2410_WTCON);
-	spin_unlock(&wdt_lock);
+	writel(wdt->count, wdt->reg_base + S3C2410_WTDAT);
+	writel(wdt->count, wdt->reg_base + S3C2410_WTCNT);
+	writel(wtcon, wdt->reg_base + S3C2410_WTCON);
+	spin_unlock(&wdt->lock);
 
 	return 0;
 }
 
-static inline int s3c2410wdt_is_running(void)
+static inline int s3c2410wdt_is_running(struct s3c2410_wdt *wdt)
 {
-	return readl(wdt_base + S3C2410_WTCON) & S3C2410_WTCON_ENABLE;
+	return readl(wdt->reg_base + S3C2410_WTCON) & S3C2410_WTCON_ENABLE;
 }
 
 static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeout)
 {
-	unsigned long freq = clk_get_rate(wdt_clock);
+	struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
+	unsigned long freq = clk_get_rate(wdt->clock);
 	unsigned int count;
 	unsigned int divisor = 1;
 	unsigned long wtcon;
@@ -192,7 +207,7 @@ static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeou
 		}
 
 		if ((count / divisor) >= 0x10000) {
-			dev_err(wdt_dev, "timeout %d too big\n", timeout);
+			dev_err(wdt->dev, "timeout %d too big\n", timeout);
 			return -EINVAL;
 		}
 	}
@@ -201,15 +216,15 @@ static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeou
 	    __func__, timeout, divisor, count, count/divisor);
 
 	count /= divisor;
-	wdt_count = count;
+	wdt->count = count;
 
 	/* update the pre-scaler */
-	wtcon = readl(wdt_base + S3C2410_WTCON);
+	wtcon = readl(wdt->reg_base + S3C2410_WTCON);
 	wtcon &= ~S3C2410_WTCON_PRESCALE_MASK;
 	wtcon |= S3C2410_WTCON_PRESCALE(divisor-1);
 
-	writel(count, wdt_base + S3C2410_WTDAT);
-	writel(wtcon, wdt_base + S3C2410_WTCON);
+	writel(count, wdt->reg_base + S3C2410_WTDAT);
+	writel(wtcon, wdt->reg_base + S3C2410_WTCON);
 
 	wdd->timeout = (count * divisor) / freq;
 
@@ -242,21 +257,23 @@ static struct watchdog_device s3c2410_wdd = {
 
 static irqreturn_t s3c2410wdt_irq(int irqno, void *param)
 {
-	dev_info(wdt_dev, "watchdog timer expired (irq)\n");
+	struct s3c2410_wdt *wdt = platform_get_drvdata(param);
 
-	s3c2410wdt_keepalive(&s3c2410_wdd);
+	dev_info(wdt->dev, "watchdog timer expired (irq)\n");
+
+	s3c2410wdt_keepalive(&wdt->wdt_device);
 	return IRQ_HANDLED;
 }
 
-
 #ifdef CONFIG_CPU_FREQ
 
 static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb,
 					  unsigned long val, void *data)
 {
 	int ret;
+	struct s3c2410_wdt *wdt = freq_to_wdt(nb);
 
-	if (!s3c2410wdt_is_running())
+	if (!s3c2410wdt_is_running(wdt))
 		goto done;
 
 	if (val == CPUFREQ_PRECHANGE) {
@@ -265,14 +282,15 @@ static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb,
 		 * the watchdog is running.
 		 */
 
-		s3c2410wdt_keepalive(&s3c2410_wdd);
+		s3c2410wdt_keepalive(&wdt->wdt_device);
 	} else if (val == CPUFREQ_POSTCHANGE) {
-		s3c2410wdt_stop(&s3c2410_wdd);
+		s3c2410wdt_stop(&wdt->wdt_device);
 
-		ret = s3c2410wdt_set_heartbeat(&s3c2410_wdd, s3c2410_wdd.timeout);
+		ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
+						wdt->wdt_device.timeout);
 
 		if (ret >= 0)
-			s3c2410wdt_start(&s3c2410_wdd);
+			s3c2410wdt_start(&wdt->wdt_device);
 		else
 			goto err;
 	}
@@ -281,34 +299,35 @@ done:
 	return 0;
 
  err:
-	dev_err(wdt_dev, "cannot set new value for timeout %d\n",
-				s3c2410_wdd.timeout);
+	dev_err(wdt->dev, "cannot set new value for timeout %d\n",
+				wdt->wdt_device.timeout);
 	return ret;
 }
 
-static struct notifier_block s3c2410wdt_cpufreq_transition_nb = {
-	.notifier_call	= s3c2410wdt_cpufreq_transition,
-};
-
-static inline int s3c2410wdt_cpufreq_register(void)
+static inline int s3c2410wdt_cpufreq_register(struct s3c2410_wdt *wdt)
 {
-	return cpufreq_register_notifier(&s3c2410wdt_cpufreq_transition_nb,
+	wdt->freq_transition.notifier_call = s3c2410wdt_cpufreq_transition;
+
+	return cpufreq_register_notifier(&wdt->freq_transition,
 					 CPUFREQ_TRANSITION_NOTIFIER);
 }
 
-static inline void s3c2410wdt_cpufreq_deregister(void)
+static inline void s3c2410wdt_cpufreq_deregister(struct s3c2410_wdt *wdt)
 {
-	cpufreq_unregister_notifier(&s3c2410wdt_cpufreq_transition_nb,
+	wdt->freq_transition.notifier_call = s3c2410wdt_cpufreq_transition;
+
+	cpufreq_unregister_notifier(&wdt->freq_transition,
 				    CPUFREQ_TRANSITION_NOTIFIER);
 }
 
 #else
-static inline int s3c2410wdt_cpufreq_register(void)
+
+static inline int s3c2410wdt_cpufreq_register(struct s3c2410_wdt *wdt)
 {
 	return 0;
 }
 
-static inline void s3c2410wdt_cpufreq_deregister(void)
+static inline void s3c2410wdt_cpufreq_deregister(struct s3c2410_wdt *wdt)
 {
 }
 #endif
@@ -316,6 +335,9 @@ static inline void s3c2410wdt_cpufreq_deregister(void)
 static int s3c2410wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev;
+	struct s3c2410_wdt *wdt;
+	struct resource *wdt_mem;
+	struct resource *wdt_irq;
 	unsigned int wtcon;
 	int started = 0;
 	int ret;
@@ -323,8 +345,14 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	DBG("%s: probe=%p\n", __func__, pdev);
 
 	dev = &pdev->dev;
-	wdt_dev = &pdev->dev;
 
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+
+	wdt->dev = &pdev->dev;
+	spin_lock_init(&wdt->lock);
+	wdt->wdt_device = s3c2410_wdd;
 	wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (wdt_mem == NULL) {
 		dev_err(dev, "no memory resource specified\n");
@@ -339,35 +367,39 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	}
 
 	/* get the memory region for the watchdog timer */
-	wdt_base = devm_ioremap_resource(dev, wdt_mem);
-	if (IS_ERR(wdt_base)) {
-		ret = PTR_ERR(wdt_base);
+	wdt->reg_base = devm_ioremap_resource(dev, wdt_mem);
+	if (IS_ERR(wdt->reg_base)) {
+		ret = PTR_ERR(wdt->reg_base);
 		goto err;
 	}
 
-	DBG("probe: mapped wdt_base=%p\n", wdt_base);
+	DBG("probe: mapped reg_base=%p\n", wdt->reg_base);
 
-	wdt_clock = devm_clk_get(dev, "watchdog");
-	if (IS_ERR(wdt_clock)) {
+	wdt->clock = devm_clk_get(dev, "watchdog");
+	if (IS_ERR(wdt->clock)) {
 		dev_err(dev, "failed to find watchdog clock source\n");
-		ret = PTR_ERR(wdt_clock);
+		ret = PTR_ERR(wdt->clock);
 		goto err;
 	}
 
-	clk_prepare_enable(wdt_clock);
+	clk_prepare_enable(wdt->clock);
 
-	ret = s3c2410wdt_cpufreq_register();
+	ret = s3c2410wdt_cpufreq_register(wdt);
 	if (ret < 0) {
 		dev_err(dev, "failed to register cpufreq\n");
 		goto err_clk;
 	}
 
+	watchdog_set_drvdata(&wdt->wdt_device, wdt);
+
 	/* see if we can actually set the requested timer margin, and if
 	 * not, try the default value */
 
-	watchdog_init_timeout(&s3c2410_wdd, tmr_margin,  &pdev->dev);
-	if (s3c2410wdt_set_heartbeat(&s3c2410_wdd, s3c2410_wdd.timeout)) {
-		started = s3c2410wdt_set_heartbeat(&s3c2410_wdd,
+	watchdog_init_timeout(&wdt->wdt_device, tmr_margin, &pdev->dev);
+	ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
+					wdt->wdt_device.timeout);
+	if (ret) {
+		started = s3c2410wdt_set_heartbeat(&wdt->wdt_device,
 					CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME);
 
 		if (started == 0)
@@ -386,9 +418,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 		goto err_cpufreq;
 	}
 
-	watchdog_set_nowayout(&s3c2410_wdd, nowayout);
+	watchdog_set_nowayout(&wdt->wdt_device, nowayout);
 
-	ret = watchdog_register_device(&s3c2410_wdd);
+	ret = watchdog_register_device(&wdt->wdt_device);
 	if (ret) {
 		dev_err(dev, "cannot register watchdog (%d)\n", ret);
 		goto err_cpufreq;
@@ -396,18 +428,20 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 
 	if (tmr_atboot && started == 0) {
 		dev_info(dev, "starting watchdog timer\n");
-		s3c2410wdt_start(&s3c2410_wdd);
+		s3c2410wdt_start(&wdt->wdt_device);
 	} else if (!tmr_atboot) {
 		/* if we're not enabling the watchdog, then ensure it is
 		 * disabled if it has been left running from the bootloader
 		 * or other source */
 
-		s3c2410wdt_stop(&s3c2410_wdd);
+		s3c2410wdt_stop(&wdt->wdt_device);
 	}
 
+	platform_set_drvdata(pdev, wdt);
+
 	/* print out a statement of readiness */
 
-	wtcon = readl(wdt_base + S3C2410_WTCON);
+	wtcon = readl(wdt->reg_base + S3C2410_WTCON);
 
 	dev_info(dev, "watchdog %sactive, reset %sabled, irq %sabled\n",
 		 (wtcon & S3C2410_WTCON_ENABLE) ?  "" : "in",
@@ -417,64 +451,64 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	return 0;
 
  err_cpufreq:
-	s3c2410wdt_cpufreq_deregister();
+	s3c2410wdt_cpufreq_deregister(wdt);
 
  err_clk:
-	clk_disable_unprepare(wdt_clock);
-	wdt_clock = NULL;
+	clk_disable_unprepare(wdt->clock);
+	wdt->clock = NULL;
 
  err:
-	wdt_irq = NULL;
-	wdt_mem = NULL;
 	return ret;
 }
 
 static int s3c2410wdt_remove(struct platform_device *dev)
 {
-	watchdog_unregister_device(&s3c2410_wdd);
+	struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+
+	watchdog_unregister_device(&wdt->wdt_device);
 
-	s3c2410wdt_cpufreq_deregister();
+	s3c2410wdt_cpufreq_deregister(wdt);
 
-	clk_disable_unprepare(wdt_clock);
-	wdt_clock = NULL;
+	clk_disable_unprepare(wdt->clock);
+	wdt->clock = NULL;
 
-	wdt_irq = NULL;
-	wdt_mem = NULL;
 	return 0;
 }
 
 static void s3c2410wdt_shutdown(struct platform_device *dev)
 {
-	s3c2410wdt_stop(&s3c2410_wdd);
+	struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
+
+	s3c2410wdt_stop(&wdt->wdt_device);
 }
 
 #ifdef CONFIG_PM_SLEEP
 
-static unsigned long wtcon_save;
-static unsigned long wtdat_save;
-
 static int s3c2410wdt_suspend(struct device *dev)
 {
+	struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
+
 	/* Save watchdog state, and turn it off. */
-	wtcon_save = readl(wdt_base + S3C2410_WTCON);
-	wtdat_save = readl(wdt_base + S3C2410_WTDAT);
+	wdt->wtcon_save = readl(wdt->reg_base + S3C2410_WTCON);
+	wdt->wtdat_save = readl(wdt->reg_base + S3C2410_WTDAT);
 
 	/* Note that WTCNT doesn't need to be saved. */
-	s3c2410wdt_stop(&s3c2410_wdd);
+	s3c2410wdt_stop(&wdt->wdt_device);
 
 	return 0;
 }
 
 static int s3c2410wdt_resume(struct device *dev)
 {
-	/* Restore watchdog state. */
+	struct s3c2410_wdt *wdt = dev_get_drvdata(dev);
 
-	writel(wtdat_save, wdt_base + S3C2410_WTDAT);
-	writel(wtdat_save, wdt_base + S3C2410_WTCNT); /* Reset count */
-	writel(wtcon_save, wdt_base + S3C2410_WTCON);
+	/* Restore watchdog state. */
+	writel(wdt->wtdat_save, wdt->reg_base + S3C2410_WTDAT);
+	writel(wdt->wtdat_save, wdt->reg_base + S3C2410_WTCNT);/* Reset count */
+	writel(wdt->wtcon_save, wdt->reg_base + S3C2410_WTCON);
 
 	dev_info(dev, "watchdog %sabled\n",
-		(wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
+		(wdt->wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
 
 	return 0;
 }