From: jon-hunter@ti•com (Jon Hunter)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V2 01/14] ARM: OMAP: Add DMTIMER definitions for posted mode
Date: Thu, 8 Nov 2012 10:52:40 -0600 [thread overview]
Message-ID: <509BE358.2080004@ti.com> (raw)
In-Reply-To: <509ADAFE.4070109@ti.com>
On 11/07/2012 04:04 PM, Santosh Shilimkar wrote:
> On Wednesday 07 November 2012 01:01 PM, Jon Hunter wrote:
>> 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.
>>
>> Add separate definitions for the clock-events and clock-source timers
>> so that
>> we can change the posted mode of clock-events and clock-source
>> independently.
>>
>> Signed-off-by: Jon Hunter <jon-hunter@ti•com>
>> ---
>> arch/arm/mach-omap2/timer.c | 26
>> +++++++++++++++++++-------
>> arch/arm/plat-omap/include/plat/dmtimer.h | 4 ++++
>> 2 files changed, 23 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
>> index 0758bae..28c6078 100644
>> --- a/arch/arm/mach-omap2/timer.c
>> +++ b/arch/arm/mach-omap2/timer.c
>> @@ -82,6 +82,13 @@
>> #define INCREMENTER_DENUMERATOR_RELOAD_OFFSET 0x14
>> #define NUMERATOR_DENUMERATOR_MASK 0xfffff000
>>
>> +/*
>> + * For clock-events timer, always use posted mode to
>> + * minimise CPU overhead for configuring the timer.
>> + */
>> +#define OMAP_CLKEVT_POSTEDMODE OMAP_TIMER_POSTED
>> +#define OMAP_CLKSRC_POSTEDMODE OMAP_TIMER_POSTED
>> +
> I don't see need of above defines. Just use OMAP_TIMER_POSTED directly
> with API. Rest of the patch looks fine.
>
> Apart from above one comment,
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti•com>
Ok, updated and dropped the additional definitions. Let me know if you
are ok with this.
Cheers
Jon
>From f1c783b5af933374431bcb8acb01d0b5c79d5661 Mon Sep 17 00:00:00 2001
From: Jon Hunter <jon-hunter@ti•com>
Date: Thu, 27 Sep 2012 11:49:45 -0500
Subject: [PATCH 1/2] ARM: OMAP: Add DMTIMER definitions for posted mode
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>
---
arch/arm/mach-omap2/timer.c | 17 ++++++++++-------
arch/arm/plat-omap/include/plat/dmtimer.h | 4 ++++
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 0758bae..ad427ba 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -107,7 +107,7 @@ 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;
}
@@ -117,7 +117,7 @@ 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:
@@ -125,10 +125,10 @@ 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;
@@ -358,7 +358,8 @@ 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 = {
@@ -372,7 +373,8 @@ 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;
}
@@ -454,7 +456,8 @@ 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))
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 348f855..835c3bdf 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -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
--
1.7.9.5
next prev parent reply other threads:[~2012-11-08 16:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 19:01 [PATCH V2 00/14] ARM: OMAP: DMTIMER fixes Jon Hunter
2012-11-07 19:01 ` [PATCH V2 01/14] ARM: OMAP: Add DMTIMER definitions for posted mode Jon Hunter
2012-11-07 22:04 ` Santosh Shilimkar
2012-11-07 22:11 ` Jon Hunter
2012-11-07 22:18 ` Santosh Shilimkar
2012-11-07 22:47 ` Jon Hunter
2012-11-08 16:52 ` Jon Hunter [this message]
2012-11-07 19:01 ` [PATCH V2 02/14] ARM: OMAP2+: Disable posted mode for the clocksource timer Jon Hunter
2012-11-07 22:10 ` Santosh Shilimkar
2012-11-07 22:41 ` Jon Hunter
2012-11-07 19:01 ` [PATCH V2 03/14] ARM: OMAP3+: Implement timer workaround for errata i103 and i767 Jon Hunter
2012-11-07 22:14 ` Santosh Shilimkar
2012-11-07 23:28 ` Jon Hunter
2012-11-07 23:43 ` Santosh Shilimkar
2012-11-08 16:55 ` Jon Hunter
2012-11-09 19:41 ` Jon Hunter
2012-11-07 19:01 ` [PATCH V2 04/14] ARM: OMAP: Fix timer posted mode support Jon Hunter
2012-11-07 22:21 ` Santosh Shilimkar
2012-11-07 19:01 ` [PATCH V2 05/14] ARM: OMAP3: Correct HWMOD DMTIMER SYSC register declarations Jon Hunter
2012-11-07 19:01 ` [PATCH V2 06/14] ARM: OMAP2/3: Define HWMOD software reset status for DMTIMERs Jon Hunter
2012-11-07 19:01 ` [PATCH V2 07/14] ARM: OMAP2+: Don't use __omap_dm_timer_reset() Jon Hunter
2012-11-07 19:01 ` [PATCH V2 08/14] ARM: OMAP: Fix dmtimer reset for timer1 Jon Hunter
2012-11-07 19:01 ` [PATCH V2 09/14] ARM: OMAP: Don't restore of DMTIMER TISTAT register Jon Hunter
2012-11-07 19:01 ` [PATCH V2 10/14] ARM: OMAP: Don't restore DMTIMER interrupt status register Jon Hunter
2012-11-07 19:01 ` [PATCH V2 11/14] ARM: OMAP: Fix spurious interrupts when using timer match feature Jon Hunter
2012-11-07 19:01 ` [PATCH V2 12/14] ARM: OMAP: Add dmtimer interrupt disable function Jon Hunter
2012-11-07 19:01 ` [PATCH V2 13/14] ARM: OMAP: Remove unnecessary call to clk_get() Jon Hunter
2012-11-07 19:01 ` [PATCH V2 14/14] ARM: OMAP: Remove __omap_dm_timer_set_source function Jon Hunter
2012-11-07 21:22 ` [PATCH V2 00/14] ARM: OMAP: DMTIMER fixes Tony Lindgren
2012-11-07 21:44 ` Jon Hunter
2012-11-07 21:52 ` Tony Lindgren
2012-11-07 22:27 ` Santosh Shilimkar
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