forked from Minki/linux
Blackfin arch: cleanup the time.c code
- make the code a bit more readable - kill of warnings/ifdef mess a bit Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Mike Frysinger
Bryan Wu
parent
33c8691f45
commit
1b047d8cc5
@ -1,32 +1,11 @@
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/*
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* File: arch/blackfin/kernel/time.c
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* Based on: none - original work
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* Author:
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* arch/blackfin/kernel/time.c
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*
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* Created:
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* Description: This file contains the bfin-specific time handling details.
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* Most of the stuff is located in the machine specific files.
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* FIXME: (This file is subject for removal)
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* This file contains the Blackfin-specific time handling details.
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* Most of the stuff is located in the machine specific files.
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*
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* Modified:
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* Copyright 2004-2008 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* Copyright 2004-2008 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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@ -43,41 +22,15 @@
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/* This is an NTP setting */
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#define TICK_SIZE (tick_nsec / 1000)
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static void time_sched_init(irq_handler_t timer_routine);
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static unsigned long gettimeoffset(void);
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static struct irqaction bfin_timer_irq = {
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.name = "BFIN Timer Tick",
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.name = "Blackfin Timer Tick",
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#ifdef CONFIG_IRQ_PER_CPU
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.flags = IRQF_DISABLED | IRQF_PERCPU,
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.flags = IRQF_DISABLED | IRQF_PERCPU,
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#else
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.flags = IRQF_DISABLED
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#endif
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};
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void setup_core_timer(void)
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{
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u32 tcount;
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/* power up the timer, but don't enable it just yet */
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bfin_write_TCNTL(1);
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CSYNC();
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/*
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* the TSCALE prescaler counter.
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*/
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bfin_write_TSCALE((TIME_SCALE - 1));
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tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1);
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bfin_write_TPERIOD(tcount);
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bfin_write_TCOUNT(tcount);
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/* now enable the timer */
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CSYNC();
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bfin_write_TCNTL(7);
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}
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#ifdef CONFIG_TICK_SOURCE_SYSTMR0
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void setup_system_timer0(void)
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{
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@ -95,6 +48,27 @@ void setup_system_timer0(void)
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SSYNC();
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enable_gptimers(TIMER0bit);
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}
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#else
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void setup_core_timer(void)
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{
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u32 tcount;
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/* power up the timer, but don't enable it just yet */
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bfin_write_TCNTL(1);
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CSYNC();
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/* the TSCALE prescaler counter */
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bfin_write_TSCALE(TIME_SCALE - 1);
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tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1);
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bfin_write_TPERIOD(tcount);
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bfin_write_TCOUNT(tcount);
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/* now enable the timer */
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CSYNC();
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bfin_write_TCNTL(7);
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}
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#endif
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static void
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@ -102,13 +76,11 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
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{
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#ifdef CONFIG_TICK_SOURCE_SYSTMR0
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setup_system_timer0();
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#else
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setup_core_timer();
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#endif
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bfin_timer_irq.handler = (irq_handler_t)timer_routine;
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#ifdef CONFIG_TICK_SOURCE_SYSTMR0
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bfin_timer_irq.handler = timer_routine;
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setup_irq(IRQ_TIMER0, &bfin_timer_irq);
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#else
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setup_core_timer();
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bfin_timer_irq.handler = timer_routine;
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setup_irq(IRQ_CORETMR, &bfin_timer_irq);
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#endif
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}
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@ -116,14 +88,15 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
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/*
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* Should return useconds since last timer tick
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*/
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#ifndef CONFIG_GENERIC_TIME
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static unsigned long gettimeoffset(void)
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{
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unsigned long offset;
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unsigned long clocks_per_jiffy;
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#ifdef CONFIG_TICK_SOURCE_SYSTMR0
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clocks_per_jiffy = bfin_read_TIMER0_PERIOD();
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offset = bfin_read_TIMER0_COUNTER() / \
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clocks_per_jiffy = bfin_read_TIMER0_PERIOD();
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offset = bfin_read_TIMER0_COUNTER() / \
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(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
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if ((get_gptimer_status(0) & TIMER_STATUS_TIMIL0) && offset < (100000 / HZ / 2))
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@ -131,7 +104,7 @@ static unsigned long gettimeoffset(void)
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#else
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clocks_per_jiffy = bfin_read_TPERIOD();
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offset = (clocks_per_jiffy - bfin_read_TCOUNT()) / \
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(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
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(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
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/* Check if we just wrapped the counters and maybe missed a tick */
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if ((bfin_read_ILAT() & (1 << IRQ_CORETMR))
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@ -140,6 +113,7 @@ static unsigned long gettimeoffset(void)
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#endif
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return offset;
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}
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#endif
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static inline int set_rtc_mmss(unsigned long nowtime)
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{
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@ -151,9 +125,8 @@ static inline int set_rtc_mmss(unsigned long nowtime)
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* as well as call the "do_timer()" routine every clocktick
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*/
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#ifdef CONFIG_CORE_TIMER_IRQ_L1
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irqreturn_t timer_interrupt(int irq, void *dummy)__attribute__((l1_text));
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__attribute__((l1_text))
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#endif
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irqreturn_t timer_interrupt(int irq, void *dummy)
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{
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/* last time the cmos clock got updated */
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@ -165,13 +138,11 @@ irqreturn_t timer_interrupt(int irq, void *dummy)
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#endif
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do_timer(1);
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/*
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* If we have an externally synchronized Linux clock, then update
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* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
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* called as close as possible to 500 ms before the new second starts.
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*/
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if (ntp_synced() &&
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xtime.tv_sec > last_rtc_update + 660 &&
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(xtime.tv_nsec / NSEC_PER_USEC) >=
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