From 7aac482e6290ab7ad21809e0c7327be959a2203e Mon Sep 17 00:00:00 2001
From: Tomasz Figa <t.figa@samsung.com>
Date: Tue, 23 Apr 2013 17:46:24 +0200
Subject: clocksource: samsung_pwm_timer: Make PWM spinlock global

This patch makes the PWM spinlock global and exports it to allow using
it in Samsung PWM driver (will be reworked to use proper synchronization
in further patches).

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index 1752457..d9048b8 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -49,6 +49,9 @@
 #define TCON_INVERT(chan)		(1 << (4 * (chan) + 2))
 #define TCON_AUTORELOAD(chan)		(1 << (4 * (chan) + 3))
 
+DEFINE_SPINLOCK(samsung_pwm_lock);
+EXPORT_SYMBOL(samsung_pwm_lock);
+
 struct samsung_timer_source {
 	unsigned int event_id;
 	unsigned int source_id;
@@ -72,14 +75,14 @@ static void samsung_timer_set_prescale(struct samsung_pwm *pwm,
 	if (channel >= 2)
 		shift = TCFG0_PRESCALER1_SHIFT;
 
-	spin_lock_irqsave(&pwm->slock, flags);
+	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
 	reg = readl(pwm->base + REG_TCFG0);
 	reg &= ~(TCFG0_PRESCALER_MASK << shift);
 	reg |= (prescale - 1) << shift;
 	writel(reg, pwm->base + REG_TCFG0);
 
-	spin_unlock_irqrestore(&pwm->slock, flags);
+	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }
 
 static void samsung_timer_set_divisor(struct samsung_pwm *pwm,
@@ -92,14 +95,14 @@ static void samsung_timer_set_divisor(struct samsung_pwm *pwm,
 
 	bits = (fls(divisor) - 1) - pwm->variant.div_base;
 
-	spin_lock_irqsave(&pwm->slock, flags);
+	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
 	reg = readl(pwm->base + REG_TCFG1);
 	reg &= ~(TCFG1_MUX_MASK << shift);
 	reg |= bits << shift;
 	writel(reg, pwm->base + REG_TCFG1);
 
-	spin_unlock_irqrestore(&pwm->slock, flags);
+	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }
 
 static void samsung_time_stop(unsigned int channel)
@@ -110,13 +113,13 @@ static void samsung_time_stop(unsigned int channel)
 	if (channel > 0)
 		++channel;
 
-	spin_lock_irqsave(&pwm->slock, flags);
+	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
 	tcon = __raw_readl(pwm->base + REG_TCON);
 	tcon &= ~TCON_START(channel);
 	__raw_writel(tcon, pwm->base + REG_TCON);
 
-	spin_unlock_irqrestore(&pwm->slock, flags);
+	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }
 
 static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
@@ -128,7 +131,7 @@ static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
 	if (tcon_chan > 0)
 		++tcon_chan;
 
-	spin_lock_irqsave(&pwm->slock, flags);
+	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
 	tcon = __raw_readl(pwm->base + REG_TCON);
 
@@ -141,7 +144,7 @@ static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
 	__raw_writel(tcnt, pwm->base + REG_TCMPB(channel));
 	__raw_writel(tcon, pwm->base + REG_TCON);
 
-	spin_unlock_irqrestore(&pwm->slock, flags);
+	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }
 
 static void samsung_time_start(unsigned int channel, bool periodic)
@@ -152,7 +155,7 @@ static void samsung_time_start(unsigned int channel, bool periodic)
 	if (channel > 0)
 		++channel;
 
-	spin_lock_irqsave(&pwm->slock, flags);
+	spin_lock_irqsave(&samsung_pwm_lock, flags);
 
 	tcon = __raw_readl(pwm->base + REG_TCON);
 
@@ -166,7 +169,7 @@ static void samsung_time_start(unsigned int channel, bool periodic)
 
 	__raw_writel(tcon, pwm->base + REG_TCON);
 
-	spin_unlock_irqrestore(&pwm->slock, flags);
+	spin_unlock_irqrestore(&samsung_pwm_lock, flags);
 }
 
 static int samsung_set_next_event(unsigned long cycles,
@@ -394,7 +397,6 @@ static void __init samsung_pwm_alloc(struct device_node *np,
 		return;
 	}
 	memcpy(&pwm->variant, variant, sizeof(pwm->variant));
-	spin_lock_init(&pwm->slock);
 	for (i = 0; i < SAMSUNG_PWM_NUM; ++i)
 		pwm->irq[i] = irq_of_parse_and_map(np, i);
 
diff --git a/include/clocksource/samsung_pwm.h b/include/clocksource/samsung_pwm.h
index eff8668..399d241 100644
--- a/include/clocksource/samsung_pwm.h
+++ b/include/clocksource/samsung_pwm.h
@@ -23,6 +23,8 @@
 struct platform_device;
 struct device_node;
 
+extern spinlock_t samsung_pwm_lock;
+
 struct samsung_pwm_variant {
 	u8 bits;
 	u8 div_base;
-- 
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