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ARM: OMAP: Add enable/disable functions for dmtimer
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Add enable/disable functions which effectively control the GPT iclk and fclk.

Signed-off-by: Timo Teras <timo.teras@solidboot.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
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Timo Teras authored and Tony Lindgren committed Sep 25, 2006
1 parent 893a668 commit 12583a7
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Showing 2 changed files with 33 additions and 42 deletions.
73 changes: 31 additions & 42 deletions arch/arm/plat-omap/dmtimer.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@ struct omap_dm_timer {
#endif
void __iomem *io_base;
unsigned reserved:1;
unsigned enabled:1;
};

#ifdef CONFIG_ARCH_OMAP1
Expand Down Expand Up @@ -164,7 +165,7 @@ static void omap_dm_timer_reset(struct omap_dm_timer *timer)
omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
omap_dm_timer_wait_for_reset(timer);
}
omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_SYS_CLK);
omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);

/* Set to smart-idle mode */
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
Expand All @@ -174,15 +175,8 @@ static void omap_dm_timer_reset(struct omap_dm_timer *timer)

static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
{
omap_dm_clk_enable(timer->fclk);
omap_dm_clk_enable(timer->iclk);

omap_dm_timer_enable(timer);
omap_dm_timer_reset(timer);

/* Leave iclk enabled for GPT1 as it is needed for the
* system timer to work properly. */
if (timer != &dm_timers[0])
omap_dm_clk_disable(timer->iclk);
}

struct omap_dm_timer *omap_dm_timer_request(void)
Expand Down Expand Up @@ -233,18 +227,36 @@ struct omap_dm_timer *omap_dm_timer_request_specific(int id)

void omap_dm_timer_free(struct omap_dm_timer *timer)
{
omap_dm_clk_enable(timer->iclk);
omap_dm_timer_enable(timer);
omap_dm_timer_reset(timer);
omap_dm_clk_disable(timer->iclk);

if (timer == &dm_timers[0])
omap_dm_clk_disable(timer->iclk);
omap_dm_clk_disable(timer->fclk);
omap_dm_timer_disable(timer);

WARN_ON(!timer->reserved);
timer->reserved = 0;
}

void omap_dm_timer_enable(struct omap_dm_timer *timer)
{
if (timer->enabled)
return;

omap_dm_clk_enable(timer->fclk);
omap_dm_clk_enable(timer->iclk);

timer->enabled = 1;
}

void omap_dm_timer_disable(struct omap_dm_timer *timer)
{
if (!timer->enabled)
return;

omap_dm_clk_disable(timer->iclk);
omap_dm_clk_disable(timer->fclk);

timer->enabled = 0;
}

int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
{
return timer->irq;
Expand Down Expand Up @@ -301,35 +313,29 @@ __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)

void omap_dm_timer_trigger(struct omap_dm_timer *timer)
{
omap_dm_clk_enable(timer->iclk);
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
omap_dm_clk_disable(timer->iclk);
}

void omap_dm_timer_start(struct omap_dm_timer *timer)
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (!(l & OMAP_TIMER_CTRL_ST)) {
l |= OMAP_TIMER_CTRL_ST;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
omap_dm_clk_disable(timer->iclk);
}

void omap_dm_timer_stop(struct omap_dm_timer *timer)
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (l & OMAP_TIMER_CTRL_ST) {
l &= ~0x1;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
}
omap_dm_clk_disable(timer->iclk);
}

#ifdef CONFIG_ARCH_OMAP1
Expand Down Expand Up @@ -367,7 +373,6 @@ void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (autoreload)
l |= OMAP_TIMER_CTRL_AR;
Expand All @@ -376,23 +381,20 @@ void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
omap_dm_clk_disable(timer->iclk);
}

void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
unsigned int match)
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (enable)
l |= OMAP_TIMER_CTRL_CE;
else
l &= ~OMAP_TIMER_CTRL_CE;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
omap_dm_clk_disable(timer->iclk);
}


Expand All @@ -401,7 +403,6 @@ void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
OMAP_TIMER_CTRL_PT | (0x03 << 10));
Expand All @@ -411,66 +412,53 @@ void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
l |= OMAP_TIMER_CTRL_PT;
l |= trigger << 10;
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_clk_disable(timer->iclk);
}

void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
{
u32 l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
if (prescaler >= 0x00 && prescaler <= 0x07) {
l |= OMAP_TIMER_CTRL_PRE;
l |= prescaler << 2;
}
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_clk_disable(timer->iclk);
}

void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
unsigned int value)
{
omap_dm_clk_enable(timer->iclk);
omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
omap_dm_clk_disable(timer->iclk);
}

unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
{
unsigned int l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
omap_dm_clk_disable(timer->iclk);

return l;
}

void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
{
omap_dm_clk_enable(timer->iclk);
omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
omap_dm_clk_disable(timer->iclk);
}

unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
{
unsigned int l;

omap_dm_clk_enable(timer->iclk);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
omap_dm_clk_disable(timer->iclk);

return l;
}

void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
{
omap_dm_clk_enable(timer->iclk);
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
omap_dm_clk_disable(timer->iclk);
}

int omap_dm_timers_active(void)
Expand All @@ -481,13 +469,14 @@ int omap_dm_timers_active(void)
struct omap_dm_timer *timer;

timer = &dm_timers[i];
omap_dm_clk_enable(timer->iclk);

if (!timer->enabled)
continue;

if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
OMAP_TIMER_CTRL_ST) {
omap_dm_clk_disable(timer->iclk);
return 1;
}
omap_dm_clk_disable(timer->iclk);
}
return 0;
}
Expand Down
2 changes: 2 additions & 0 deletions include/asm-arm/arch-omap/dmtimer.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,8 @@ int omap_dm_timer_init(void);
struct omap_dm_timer *omap_dm_timer_request(void);
struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
void omap_dm_timer_free(struct omap_dm_timer *timer);
void omap_dm_timer_enable(struct omap_dm_timer *timer);
void omap_dm_timer_disable(struct omap_dm_timer *timer);

int omap_dm_timer_get_irq(struct omap_dm_timer *timer);

Expand Down

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