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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>
85 lines
3.4 KiB
C
85 lines
3.4 KiB
C
/*
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* linux/include/asm-arm/arch-omap/dmtimer.h
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*
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* OMAP Dual-Mode Timers
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*
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* Copyright (C) 2005 Nokia Corporation
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* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
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* PWM and clock framwork support by Timo Teras.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ASM_ARCH_DMTIMER_H
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#define __ASM_ARCH_DMTIMER_H
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/* clock sources */
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#define OMAP_TIMER_SRC_SYS_CLK 0x00
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#define OMAP_TIMER_SRC_32_KHZ 0x01
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#define OMAP_TIMER_SRC_EXT_CLK 0x02
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/* timer interrupt enable bits */
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#define OMAP_TIMER_INT_CAPTURE (1 << 2)
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#define OMAP_TIMER_INT_OVERFLOW (1 << 1)
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#define OMAP_TIMER_INT_MATCH (1 << 0)
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/* trigger types */
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#define OMAP_TIMER_TRIGGER_NONE 0x00
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#define OMAP_TIMER_TRIGGER_OVERFLOW 0x01
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#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
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struct omap_dm_timer;
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struct clk;
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int omap_dm_timer_init(void);
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struct omap_dm_timer *omap_dm_timer_request(void);
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struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
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void omap_dm_timer_free(struct omap_dm_timer *timer);
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void omap_dm_timer_enable(struct omap_dm_timer *timer);
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void omap_dm_timer_disable(struct omap_dm_timer *timer);
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int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
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u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
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struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
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void omap_dm_timer_trigger(struct omap_dm_timer *timer);
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void omap_dm_timer_start(struct omap_dm_timer *timer);
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void omap_dm_timer_stop(struct omap_dm_timer *timer);
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void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
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void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
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void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
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void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
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void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
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void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
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void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
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unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
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void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
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unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
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void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value);
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int omap_dm_timers_active(void);
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#endif /* __ASM_ARCH_DMTIMER_H */
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