提交 1b047d8c 编写于 作者: M Mike Frysinger 提交者: Bryan Wu

Blackfin arch: cleanup the time.c code

 - make the code a bit more readable
 - kill of warnings/ifdef mess a bit
Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
上级 33c8691f
/*
* File: arch/blackfin/kernel/time.c
* Based on: none - original work
* Author:
* arch/blackfin/kernel/time.c
*
* Created:
* Description: This file contains the bfin-specific time handling details.
* Most of the stuff is located in the machine specific files.
* FIXME: (This file is subject for removal)
* This file contains the Blackfin-specific time handling details.
* Most of the stuff is located in the machine specific files.
*
* Modified:
* Copyright 2004-2008 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* Copyright 2004-2008 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
......@@ -43,18 +22,33 @@
/* This is an NTP setting */
#define TICK_SIZE (tick_nsec / 1000)
static void time_sched_init(irq_handler_t timer_routine);
static unsigned long gettimeoffset(void);
static struct irqaction bfin_timer_irq = {
.name = "BFIN Timer Tick",
.name = "Blackfin Timer Tick",
#ifdef CONFIG_IRQ_PER_CPU
.flags = IRQF_DISABLED | IRQF_PERCPU,
.flags = IRQF_DISABLED | IRQF_PERCPU,
#else
.flags = IRQF_DISABLED
#endif
};
#ifdef CONFIG_TICK_SOURCE_SYSTMR0
void setup_system_timer0(void)
{
/* Power down the core timer, just to play safe. */
bfin_write_TCNTL(0);
disable_gptimers(TIMER0bit);
set_gptimer_status(0, TIMER_STATUS_TRUN0);
while (get_gptimer_status(0) & TIMER_STATUS_TRUN0)
udelay(10);
set_gptimer_config(0, 0x59); /* IRQ enable, periodic, PWM_OUT, SCLKed, OUT PAD disabled */
set_gptimer_period(TIMER0_id, get_sclk() / HZ);
set_gptimer_pwidth(TIMER0_id, 1);
SSYNC();
enable_gptimers(TIMER0bit);
}
#else
void setup_core_timer(void)
{
u32 tcount;
......@@ -63,10 +57,8 @@ void setup_core_timer(void)
bfin_write_TCNTL(1);
CSYNC();
/*
* the TSCALE prescaler counter.
*/
bfin_write_TSCALE((TIME_SCALE - 1));
/* the TSCALE prescaler counter */
bfin_write_TSCALE(TIME_SCALE - 1);
tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1);
bfin_write_TPERIOD(tcount);
......@@ -77,24 +69,6 @@ void setup_core_timer(void)
bfin_write_TCNTL(7);
}
#ifdef CONFIG_TICK_SOURCE_SYSTMR0
void setup_system_timer0(void)
{
/* Power down the core timer, just to play safe. */
bfin_write_TCNTL(0);
disable_gptimers(TIMER0bit);
set_gptimer_status(0, TIMER_STATUS_TRUN0);
while (get_gptimer_status(0) & TIMER_STATUS_TRUN0)
udelay(10);
set_gptimer_config(0, 0x59); /* IRQ enable, periodic, PWM_OUT, SCLKed, OUT PAD disabled */
set_gptimer_period(TIMER0_id, get_sclk() / HZ);
set_gptimer_pwidth(TIMER0_id, 1);
SSYNC();
enable_gptimers(TIMER0bit);
}
#endif
static void
......@@ -102,13 +76,11 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
{
#ifdef CONFIG_TICK_SOURCE_SYSTMR0
setup_system_timer0();
#else
setup_core_timer();
#endif
bfin_timer_irq.handler = (irq_handler_t)timer_routine;
#ifdef CONFIG_TICK_SOURCE_SYSTMR0
bfin_timer_irq.handler = timer_routine;
setup_irq(IRQ_TIMER0, &bfin_timer_irq);
#else
setup_core_timer();
bfin_timer_irq.handler = timer_routine;
setup_irq(IRQ_CORETMR, &bfin_timer_irq);
#endif
}
......@@ -116,14 +88,15 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
/*
* Should return useconds since last timer tick
*/
#ifndef CONFIG_GENERIC_TIME
static unsigned long gettimeoffset(void)
{
unsigned long offset;
unsigned long clocks_per_jiffy;
#ifdef CONFIG_TICK_SOURCE_SYSTMR0
clocks_per_jiffy = bfin_read_TIMER0_PERIOD();
offset = bfin_read_TIMER0_COUNTER() / \
clocks_per_jiffy = bfin_read_TIMER0_PERIOD();
offset = bfin_read_TIMER0_COUNTER() / \
(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
if ((get_gptimer_status(0) & TIMER_STATUS_TIMIL0) && offset < (100000 / HZ / 2))
......@@ -131,7 +104,7 @@ static unsigned long gettimeoffset(void)
#else
clocks_per_jiffy = bfin_read_TPERIOD();
offset = (clocks_per_jiffy - bfin_read_TCOUNT()) / \
(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
(((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC);
/* Check if we just wrapped the counters and maybe missed a tick */
if ((bfin_read_ILAT() & (1 << IRQ_CORETMR))
......@@ -140,6 +113,7 @@ static unsigned long gettimeoffset(void)
#endif
return offset;
}
#endif
static inline int set_rtc_mmss(unsigned long nowtime)
{
......@@ -151,9 +125,8 @@ static inline int set_rtc_mmss(unsigned long nowtime)
* as well as call the "do_timer()" routine every clocktick
*/
#ifdef CONFIG_CORE_TIMER_IRQ_L1
irqreturn_t timer_interrupt(int irq, void *dummy)__attribute__((l1_text));
__attribute__((l1_text))
#endif
irqreturn_t timer_interrupt(int irq, void *dummy)
{
/* last time the cmos clock got updated */
......@@ -165,13 +138,11 @@ irqreturn_t timer_interrupt(int irq, void *dummy)
#endif
do_timer(1);
/*
* If we have an externally synchronized Linux clock, then update
* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
* called as close as possible to 500 ms before the new second starts.
*/
if (ntp_synced() &&
xtime.tv_sec > last_rtc_update + 660 &&
(xtime.tv_nsec / NSEC_PER_USEC) >=
......
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