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-rw-r--r--drivers/clocksource/samsung_pwm_timer.c157
1 files changed, 74 insertions, 83 deletions
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index d9048b843546..e3257fae04e6 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -52,21 +52,25 @@
DEFINE_SPINLOCK(samsung_pwm_lock);
EXPORT_SYMBOL(samsung_pwm_lock);
-struct samsung_timer_source {
+struct samsung_pwm_clocksource {
+ void __iomem *base;
+ unsigned int irq[SAMSUNG_PWM_NUM];
+ struct samsung_pwm_variant variant;
+
+ struct clk *timerclk;
+
unsigned int event_id;
unsigned int source_id;
unsigned int tcnt_max;
unsigned int tscaler_div;
unsigned int tdiv;
+
+ unsigned long clock_count_per_tick;
};
-static struct samsung_pwm *pwm;
-static struct clk *timerclk;
-static struct samsung_timer_source timer_source;
-static unsigned long clock_count_per_tick;
+static struct samsung_pwm_clocksource pwm;
-static void samsung_timer_set_prescale(struct samsung_pwm *pwm,
- unsigned int channel, u16 prescale)
+static void samsung_timer_set_prescale(unsigned int channel, u16 prescale)
{
unsigned long flags;
u8 shift = 0;
@@ -77,30 +81,29 @@ static void samsung_timer_set_prescale(struct samsung_pwm *pwm,
spin_lock_irqsave(&samsung_pwm_lock, flags);
- reg = readl(pwm->base + REG_TCFG0);
+ reg = readl(pwm.base + REG_TCFG0);
reg &= ~(TCFG0_PRESCALER_MASK << shift);
reg |= (prescale - 1) << shift;
- writel(reg, pwm->base + REG_TCFG0);
+ writel(reg, pwm.base + REG_TCFG0);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
-static void samsung_timer_set_divisor(struct samsung_pwm *pwm,
- unsigned int channel, u8 divisor)
+static void samsung_timer_set_divisor(unsigned int channel, u8 divisor)
{
u8 shift = TCFG1_SHIFT(channel);
unsigned long flags;
u32 reg;
u8 bits;
- bits = (fls(divisor) - 1) - pwm->variant.div_base;
+ bits = (fls(divisor) - 1) - pwm.variant.div_base;
spin_lock_irqsave(&samsung_pwm_lock, flags);
- reg = readl(pwm->base + REG_TCFG1);
+ reg = readl(pwm.base + REG_TCFG1);
reg &= ~(TCFG1_MUX_MASK << shift);
reg |= bits << shift;
- writel(reg, pwm->base + REG_TCFG1);
+ writel(reg, pwm.base + REG_TCFG1);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -115,9 +118,9 @@ static void samsung_time_stop(unsigned int channel)
spin_lock_irqsave(&samsung_pwm_lock, flags);
- tcon = __raw_readl(pwm->base + REG_TCON);
+ tcon = __raw_readl(pwm.base + REG_TCON);
tcon &= ~TCON_START(channel);
- __raw_writel(tcon, pwm->base + REG_TCON);
+ __raw_writel(tcon, pwm.base + REG_TCON);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -133,16 +136,16 @@ static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
spin_lock_irqsave(&samsung_pwm_lock, flags);
- tcon = __raw_readl(pwm->base + REG_TCON);
+ tcon = __raw_readl(pwm.base + REG_TCON);
tcnt--;
tcon &= ~(TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan));
tcon |= TCON_MANUALUPDATE(tcon_chan);
- __raw_writel(tcnt, pwm->base + REG_TCNTB(channel));
- __raw_writel(tcnt, pwm->base + REG_TCMPB(channel));
- __raw_writel(tcon, pwm->base + REG_TCON);
+ __raw_writel(tcnt, pwm.base + REG_TCNTB(channel));
+ __raw_writel(tcnt, pwm.base + REG_TCMPB(channel));
+ __raw_writel(tcon, pwm.base + REG_TCON);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -157,7 +160,7 @@ static void samsung_time_start(unsigned int channel, bool periodic)
spin_lock_irqsave(&samsung_pwm_lock, flags);
- tcon = __raw_readl(pwm->base + REG_TCON);
+ tcon = __raw_readl(pwm.base + REG_TCON);
tcon &= ~TCON_MANUALUPDATE(channel);
tcon |= TCON_START(channel);
@@ -167,7 +170,7 @@ static void samsung_time_start(unsigned int channel, bool periodic)
else
tcon &= ~TCON_AUTORELOAD(channel);
- __raw_writel(tcon, pwm->base + REG_TCON);
+ __raw_writel(tcon, pwm.base + REG_TCON);
spin_unlock_irqrestore(&samsung_pwm_lock, flags);
}
@@ -175,8 +178,8 @@ static void samsung_time_start(unsigned int channel, bool periodic)
static int samsung_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
- samsung_time_setup(timer_source.event_id, cycles);
- samsung_time_start(timer_source.event_id, false);
+ samsung_time_setup(pwm.event_id, cycles);
+ samsung_time_start(pwm.event_id, false);
return 0;
}
@@ -184,23 +187,23 @@ static int samsung_set_next_event(unsigned long cycles,
static void samsung_timer_resume(void)
{
/* event timer restart */
- samsung_time_setup(timer_source.event_id, clock_count_per_tick);
- samsung_time_start(timer_source.event_id, true);
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick);
+ samsung_time_start(pwm.event_id, true);
/* source timer restart */
- samsung_time_setup(timer_source.source_id, timer_source.tcnt_max);
- samsung_time_start(timer_source.source_id, true);
+ samsung_time_setup(pwm.source_id, pwm.tcnt_max);
+ samsung_time_start(pwm.source_id, true);
}
static void samsung_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
- samsung_time_stop(timer_source.event_id);
+ samsung_time_stop(pwm.event_id);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- samsung_time_setup(timer_source.event_id, clock_count_per_tick);
- samsung_time_start(timer_source.event_id, true);
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick);
+ samsung_time_start(pwm.event_id, true);
break;
case CLOCK_EVT_MODE_ONESHOT:
@@ -228,9 +231,9 @@ static irqreturn_t samsung_clock_event_isr(int irq, void *dev_id)
{
struct clock_event_device *evt = dev_id;
- if (pwm->variant.has_tint_cstat) {
- u32 mask = (1 << timer_source.event_id);
- writel(mask | (mask << 5), pwm->base + REG_TINT_CSTAT);
+ if (pwm.variant.has_tint_cstat) {
+ u32 mask = (1 << pwm.event_id);
+ writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
}
evt->event_handler(evt);
@@ -251,39 +254,37 @@ static void __init samsung_clockevent_init(void)
unsigned long clock_rate;
unsigned int irq_number;
- pclk = clk_get_rate(timerclk);
+ pclk = clk_get_rate(pwm.timerclk);
- samsung_timer_set_prescale(pwm, timer_source.event_id,
- timer_source.tscaler_div);
- samsung_timer_set_divisor(pwm, timer_source.event_id,
- timer_source.tdiv);
+ samsung_timer_set_prescale(pwm.event_id, pwm.tscaler_div);
+ samsung_timer_set_divisor(pwm.event_id, pwm.tdiv);
- clock_rate = pclk / (timer_source.tscaler_div * timer_source.tdiv);
- clock_count_per_tick = clock_rate / HZ;
+ clock_rate = pclk / (pwm.tscaler_div * pwm.tdiv);
+ pwm.clock_count_per_tick = clock_rate / HZ;
time_event_device.cpumask = cpumask_of(0);
clockevents_config_and_register(&time_event_device, clock_rate, 1, -1);
- irq_number = pwm->irq[timer_source.event_id];
+ irq_number = pwm.irq[pwm.event_id];
setup_irq(irq_number, &samsung_clock_event_irq);
- if (pwm->variant.has_tint_cstat) {
- u32 mask = (1 << timer_source.event_id);
- writel(mask | (mask << 5), pwm->base + REG_TINT_CSTAT);
+ if (pwm.variant.has_tint_cstat) {
+ u32 mask = (1 << pwm.event_id);
+ writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
}
}
static void __iomem *samsung_timer_reg(void)
{
- switch (timer_source.source_id) {
+ switch (pwm.source_id) {
case 0:
case 1:
case 2:
case 3:
- return pwm->base + timer_source.source_id * 0x0c + 0x14;
+ return pwm.base + pwm.source_id * 0x0c + 0x14;
case 4:
- return pwm->base + 0x40;
+ return pwm.base + 0x40;
default:
BUG();
@@ -314,23 +315,21 @@ static void __init samsung_clocksource_init(void)
unsigned long clock_rate;
int ret;
- pclk = clk_get_rate(timerclk);
+ pclk = clk_get_rate(pwm.timerclk);
- samsung_timer_set_prescale(pwm, timer_source.source_id,
- timer_source.tscaler_div);
- samsung_timer_set_divisor(pwm, timer_source.source_id,
- timer_source.tdiv);
+ samsung_timer_set_prescale(pwm.source_id, pwm.tscaler_div);
+ samsung_timer_set_divisor(pwm.source_id, pwm.tdiv);
- clock_rate = pclk / (timer_source.tscaler_div * timer_source.tdiv);
+ clock_rate = pclk / (pwm.tscaler_div * pwm.tdiv);
- samsung_time_setup(timer_source.source_id, timer_source.tcnt_max);
- samsung_time_start(timer_source.source_id, true);
+ samsung_time_setup(pwm.source_id, pwm.tcnt_max);
+ samsung_time_start(pwm.source_id, true);
setup_sched_clock(samsung_read_sched_clock,
- pwm->variant.bits, clock_rate);
+ pwm.variant.bits, clock_rate);
ret = clocksource_mmio_init(reg, "samsung_clocksource_timer",
- clock_rate, 250, pwm->variant.bits,
+ clock_rate, 250, pwm.variant.bits,
clocksource_mmio_readl_down);
if (ret)
panic("samsung_clocksource_timer: can't register clocksource\n");
@@ -338,19 +337,19 @@ static void __init samsung_clocksource_init(void)
static void __init samsung_timer_resources(void)
{
- timerclk = clk_get(NULL, "timers");
- if (IS_ERR(timerclk))
+ pwm.timerclk = clk_get(NULL, "timers");
+ if (IS_ERR(pwm.timerclk))
panic("failed to get timers clock for timer");
- clk_prepare_enable(timerclk);
+ clk_prepare_enable(pwm.timerclk);
- timer_source.tcnt_max = (1UL << pwm->variant.bits) - 1;
- if (pwm->variant.bits == 16) {
- timer_source.tscaler_div = 25;
- timer_source.tdiv = 2;
+ pwm.tcnt_max = (1UL << pwm.variant.bits) - 1;
+ if (pwm.variant.bits == 16) {
+ pwm.tscaler_div = 25;
+ pwm.tdiv = 2;
} else {
- timer_source.tscaler_div = 2;
- timer_source.tdiv = 1;
+ pwm.tscaler_div = 2;
+ pwm.tdiv = 1;
}
}
@@ -362,20 +361,17 @@ static void __init samsung_pwm_clocksource_init(void)
u8 mask;
int channel;
- if (!pwm)
- panic("no pwm clocksource device found");
-
- mask = ~pwm->variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1);
+ mask = ~pwm.variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1);
channel = fls(mask) - 1;
if (channel < 0)
panic("failed to find PWM channel for clocksource");
- timer_source.source_id = channel;
+ pwm.source_id = channel;
mask &= ~(1 << channel);
channel = fls(mask) - 1;
if (channel < 0)
panic("failed to find PWM channel for clock event");
- timer_source.event_id = channel;
+ pwm.event_id = channel;
samsung_timer_resources();
samsung_clockevent_init();
@@ -391,14 +387,9 @@ static void __init samsung_pwm_alloc(struct device_node *np,
u32 val;
int i;
- pwm = kzalloc(sizeof(*pwm), GFP_KERNEL);
- if (!pwm) {
- pr_err("%s: could not allocate PWM device struct\n", __func__);
- return;
- }
- memcpy(&pwm->variant, variant, sizeof(pwm->variant));
+ memcpy(&pwm.variant, variant, sizeof(pwm.variant));
for (i = 0; i < SAMSUNG_PWM_NUM; ++i)
- pwm->irq[i] = irq_of_parse_and_map(np, i);
+ pwm.irq[i] = irq_of_parse_and_map(np, i);
of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
if (val >= SAMSUNG_PWM_NUM) {
@@ -406,7 +397,7 @@ static void __init samsung_pwm_alloc(struct device_node *np,
__func__);
continue;
}
- pwm->variant.output_mask |= 1 << val;
+ pwm.variant.output_mask |= 1 << val;
}
of_address_to_resource(np, 0, &res);
@@ -416,8 +407,8 @@ static void __init samsung_pwm_alloc(struct device_node *np,
return;
}
- pwm->base = ioremap(res.start, resource_size(&res));
- if (!pwm->base) {
+ pwm.base = ioremap(res.start, resource_size(&res));
+ if (!pwm.base) {
pr_err("%s: failed to map PWM registers\n", __func__);
release_mem_region(res.start, resource_size(&res));
return;