diff options
Diffstat (limited to 'meta/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick')
-rw-r--r-- | meta/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/meta/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick b/meta/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick deleted file mode 100644 index 6eb6c9b47..000000000 --- a/meta/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick +++ /dev/null @@ -1,97 +0,0 @@ -OMAP2/3 system tick GPTIMER: use match interrupts rather than overflow interrupts - -From: Paul Walmsley <paul@pwsan.com> - -On some OMAP3 chips, GPTIMER1 will occasionally decline to interrupt -the MPU when a timer overflow event occurs. The timer stops running; -and TOCR is sometimes incremented; but the MPU apparently never receives -the interrupt. This patch was an experiment in using the GPTIMER -match interrupt to determine if it resolves the problem. -Unfortunately, it does not; the same problem occurs with match -interrupts; but this patch is preserved as the base for a -match+overflow interrupt workaround used in a following patch. ---- - - arch/arm/mach-omap2/timer-gp.c | 32 ++++++++++---------------------- - 1 files changed, 10 insertions(+), 22 deletions(-) - -diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c -index 557603f..51996ba 100644 ---- a/arch/arm/mach-omap2/timer-gp.c -+++ b/arch/arm/mach-omap2/timer-gp.c -@@ -36,6 +36,8 @@ - #include <asm/mach/time.h> - #include <asm/arch/dmtimer.h> - -+#define GPTIMER_MATCH_VAL 0xffff0000 -+ - static struct omap_dm_timer *gptimer; - static struct clock_event_device clockevent_gpt; - -@@ -44,7 +46,7 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) - struct omap_dm_timer *gpt = (struct omap_dm_timer *)dev_id; - struct clock_event_device *evt = &clockevent_gpt; - -- omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_OVERFLOW); -+ omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_MATCH); - - evt->event_handler(evt); - return IRQ_HANDLED; -@@ -59,7 +61,7 @@ static struct irqaction omap2_gp_timer_irq = { - static int omap2_gp_timer_set_next_event(unsigned long cycles, - struct clock_event_device *evt) - { -- omap_dm_timer_set_load_start(gptimer, 0, 0xffffffff - cycles); -+ omap_dm_timer_set_load_start(gptimer, 0, GPTIMER_MATCH_VAL - cycles); - - return 0; - } -@@ -67,29 +69,12 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles, - static void omap2_gp_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) - { -- u32 period; -- - omap_dm_timer_stop(gptimer); -- -- switch (mode) { -- case CLOCK_EVT_MODE_PERIODIC: -- period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ; -- period -= 1; -- -- omap_dm_timer_set_load_start(gptimer, 1, 0xffffffff - period); -- break; -- case CLOCK_EVT_MODE_ONESHOT: -- break; -- case CLOCK_EVT_MODE_UNUSED: -- case CLOCK_EVT_MODE_SHUTDOWN: -- case CLOCK_EVT_MODE_RESUME: -- break; -- } - } - - static struct clock_event_device clockevent_gpt = { - .name = "gp timer", -- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, -+ .features = CLOCK_EVT_FEAT_ONESHOT, - .shift = 32, - .set_next_event = omap2_gp_timer_set_next_event, - .set_mode = omap2_gp_timer_set_mode, -@@ -111,12 +96,15 @@ static void __init omap2_gp_clockevent_init(void) - - omap2_gp_timer_irq.dev_id = (void *)gptimer; - setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq); -- omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW); -+ omap_dm_timer_stop(gptimer); -+ /* omap_dm_timer_set_load(gptimer, 0, 0);*/ -+ omap_dm_timer_set_match(gptimer, 1, GPTIMER_MATCH_VAL); -+ omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_MATCH); - - clockevent_gpt.mult = div_sc(tick_rate, NSEC_PER_SEC, - clockevent_gpt.shift); - clockevent_gpt.max_delta_ns = -- clockevent_delta2ns(0xffffffff, &clockevent_gpt); -+ clockevent_delta2ns(GPTIMER_MATCH_VAL, &clockevent_gpt); - clockevent_gpt.min_delta_ns = - clockevent_delta2ns(1, &clockevent_gpt); - |