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ARM: OMAP: Add DMTIMER definitions for posted mode

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For OMAP2+ devices, when using DMTIMERs for system timers (clock-events and
clock-source) the posted mode configuration of the timers is used. To allow
the compiler to optimise the functions for configuring and reading the system
timers, the posted flag variable is hard-coded with the value 1. To make it
clear that posted mode is being used add some definitions so that it is more
readable.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Jon Hunter 2012-09-27 11:49:45 -05:00
parent d308ba50a1
commit 971d025448
2 changed files with 14 additions and 7 deletions
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17
arch/arm/mach-omap2/timer.c
View file

@ -108,7 +108,7 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
__omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
0xffffffff - cycles, 1);
0xffffffff - cycles, OMAP_TIMER_POSTED);
return 0;
}
@ -118,7 +118,7 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
{
u32 period;
__omap_dm_timer_stop(&clkev, 1, clkev.rate);
__omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
@ -126,10 +126,10 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
period -= 1;
/* Looks like we need to first set the load value separately */
__omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG,
0xffffffff - period, 1);
0xffffffff - period, OMAP_TIMER_POSTED);
__omap_dm_timer_load_start(&clkev,
OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
0xffffffff - period, 1);
0xffffffff - period, OMAP_TIMER_POSTED);
break;
case CLOCK_EVT_MODE_ONESHOT:
break;
@ -359,7 +359,8 @@ static bool use_gptimer_clksrc;
*/
static cycle_t clocksource_read_cycles(struct clocksource *cs)
{
return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1);
return (cycle_t)__omap_dm_timer_read_counter(&clksrc,
OMAP_TIMER_POSTED);
}
static struct clocksource clocksource_gpt = {
@ -373,7 +374,8 @@ static struct clocksource clocksource_gpt = {
static u32 notrace dmtimer_read_sched_clock(void)
{
if (clksrc.reserved)
return __omap_dm_timer_read_counter(&clksrc, 1);
return __omap_dm_timer_read_counter(&clksrc,
OMAP_TIMER_POSTED);
return 0;
}
@ -455,7 +457,8 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
BUG_ON(res);
__omap_dm_timer_load_start(&clksrc,
OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1);
OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0,
OMAP_TIMER_POSTED);
setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);
if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))

4
arch/arm/plat-omap/include/plat/dmtimer.h
View file

@ -55,6 +55,10 @@
#define OMAP_TIMER_TRIGGER_OVERFLOW 0x01
#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
/* posted mode types */
#define OMAP_TIMER_NONPOSTED 0x00
#define OMAP_TIMER_POSTED 0x01
/* timer capabilities used in hwmod database */
#define OMAP_TIMER_SECURE 0x80000000
#define OMAP_TIMER_ALWON 0x40000000