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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>
This commit is contained in:
Tomasz Figa 2013-04-23 17:46:24 +02:00 committed by Olof Johansson
parent 77d8443449
commit 7aac482e62
2 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/clocksource/samsung_pwm_timer.c
View File

@ -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);

2
include/clocksource/samsung_pwm.h
View File

@ -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;