3fddd09e59
This patch optimizes the timer load and start sequence. By combining the
load and start a needless posted wait can be removed from the system timer
execution path.
* Before patch register writes are taking up .078% @ 500MHz during idle.
Address |total |min |max |avr |count|ratio%
old\process\default_idle|7.369s |0.0us|999.902ms|14.477ms|509. |62.661%
ld\Global\cpu_v7_do_idle|4.265s |0.0us|375.786ms|24.374ms|175. |36.270%
(UNKNOWN)|17.503ms|0.us|531.080us|5.119us|3419. |0.148%
r\omap_dm_timer_set_load|8.135ms|0.0us|79.887us|15.065us|540. |0.069% <--
\vmlinux-old\Global\_end|2.023ms|0.0us|4.000us|0.560us|3613. |0.017%
-old\Global\__raw_readsw|1.962ms|0.0us|108.610us|9.167us|214. |0.016%
old\smc91x\smc_interrupt|1.353ms|0.0us|10.212us|2.348us|576. |0.011%
s/namei\__link_path_walk|1.161ms|0.0us|4.310us|0.762us| 1524. |0.009%
\omap_dm_timer_write_reg|1.085ms|0.0us|126.150us|2.153us|504. |0.009% <--
* After patch timer functions do not show up in top listings for long captures.
Signed-off-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
84 lines
3.4 KiB
C
84 lines
3.4 KiB
C
/*
|
|
* linux/include/asm-arm/arch-omap/dmtimer.h
|
|
*
|
|
* OMAP Dual-Mode Timers
|
|
*
|
|
* Copyright (C) 2005 Nokia Corporation
|
|
* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
|
|
* PWM and clock framwork support by Timo Teras.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef __ASM_ARCH_DMTIMER_H
|
|
#define __ASM_ARCH_DMTIMER_H
|
|
|
|
/* clock sources */
|
|
#define OMAP_TIMER_SRC_SYS_CLK 0x00
|
|
#define OMAP_TIMER_SRC_32_KHZ 0x01
|
|
#define OMAP_TIMER_SRC_EXT_CLK 0x02
|
|
|
|
/* timer interrupt enable bits */
|
|
#define OMAP_TIMER_INT_CAPTURE (1 << 2)
|
|
#define OMAP_TIMER_INT_OVERFLOW (1 << 1)
|
|
#define OMAP_TIMER_INT_MATCH (1 << 0)
|
|
|
|
/* trigger types */
|
|
#define OMAP_TIMER_TRIGGER_NONE 0x00
|
|
#define OMAP_TIMER_TRIGGER_OVERFLOW 0x01
|
|
#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
|
|
|
|
struct omap_dm_timer;
|
|
struct clk;
|
|
|
|
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);
|
|
|
|
u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
|
|
struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
|
|
|
|
void omap_dm_timer_trigger(struct omap_dm_timer *timer);
|
|
void omap_dm_timer_start(struct omap_dm_timer *timer);
|
|
void omap_dm_timer_stop(struct omap_dm_timer *timer);
|
|
|
|
void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
|
|
void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
|
|
void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
|
|
void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
|
|
void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
|
|
void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
|
|
|
|
void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
|
|
|
|
unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
|
|
void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
|
|
unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
|
|
void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value);
|
|
|
|
int omap_dm_timers_active(void);
|
|
|
|
|
|
#endif /* __ASM_ARCH_DMTIMER_H */
|