integratorcp: split timer support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Peter Pearse <peter.pearse@arm.com>
This commit is contained in:
parent
2bcef0723e
commit
f54851a6e3
|
@ -25,9 +25,12 @@ include $(TOPDIR)/config.mk
|
||||||
|
|
||||||
LIB = $(obj)lib$(BOARD).a
|
LIB = $(obj)lib$(BOARD).a
|
||||||
|
|
||||||
COBJS := integratorcp.o flash.o
|
|
||||||
SOBJS := lowlevel_init.o
|
SOBJS := lowlevel_init.o
|
||||||
|
|
||||||
|
COBJS := integratorcp.o
|
||||||
|
COBJS += flash.o
|
||||||
|
COBJS += timer.o
|
||||||
|
|
||||||
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
|
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
|
||||||
OBJS := $(addprefix $(obj),$(COBJS))
|
OBJS := $(addprefix $(obj),$(COBJS))
|
||||||
SOBJS := $(addprefix $(obj),$(SOBJS))
|
SOBJS := $(addprefix $(obj),$(SOBJS))
|
||||||
|
|
|
@ -34,7 +34,6 @@
|
||||||
*/
|
*/
|
||||||
|
|
||||||
#include <common.h>
|
#include <common.h>
|
||||||
#include <div64.h>
|
|
||||||
|
|
||||||
DECLARE_GLOBAL_DATA_PTR;
|
DECLARE_GLOBAL_DATA_PTR;
|
||||||
|
|
||||||
|
@ -138,142 +137,3 @@ extern void dram_query(void);
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
/* The Integrator/CP timer1 is clocked at 1MHz
|
|
||||||
* can be divided by 16 or 256
|
|
||||||
* and can be set up as a 32-bit timer
|
|
||||||
*/
|
|
||||||
/* U-Boot expects a 32 bit timer, running at CONFIG_SYS_HZ */
|
|
||||||
/* Keep total timer count to avoid losing decrements < div_timer */
|
|
||||||
static unsigned long long total_count = 0;
|
|
||||||
static unsigned long long lastdec; /* Timer reading at last call */
|
|
||||||
static unsigned long long div_clock = 1; /* Divisor applied to timer clock */
|
|
||||||
static unsigned long long div_timer = 1; /* Divisor to convert timer reading
|
|
||||||
* change to U-Boot ticks
|
|
||||||
*/
|
|
||||||
/* CONFIG_SYS_HZ = CONFIG_SYS_HZ_CLOCK/(div_clock * div_timer) */
|
|
||||||
static ulong timestamp; /* U-Boot ticks since startup */
|
|
||||||
|
|
||||||
#define TIMER_LOAD_VAL ((ulong)0xFFFFFFFF)
|
|
||||||
#define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+4))
|
|
||||||
|
|
||||||
/* all function return values in U-Boot ticks i.e. (1/CONFIG_SYS_HZ) sec
|
|
||||||
* - unless otherwise stated
|
|
||||||
*/
|
|
||||||
|
|
||||||
/* starts up a counter
|
|
||||||
* - the Integrator/CP timer can be set up to issue an interrupt */
|
|
||||||
int timer_init (void)
|
|
||||||
{
|
|
||||||
/* Load timer with initial value */
|
|
||||||
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL;
|
|
||||||
/* Set timer to be
|
|
||||||
* enabled 1
|
|
||||||
* periodic 1
|
|
||||||
* no interrupts 0
|
|
||||||
* X 0
|
|
||||||
* divider 1 00 == less rounding error
|
|
||||||
* 32 bit 1
|
|
||||||
* wrapping 0
|
|
||||||
*/
|
|
||||||
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = 0x000000C2;
|
|
||||||
/* init the timestamp */
|
|
||||||
total_count = 0ULL;
|
|
||||||
reset_timer_masked();
|
|
||||||
|
|
||||||
div_timer = (unsigned long long)(CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ);
|
|
||||||
div_timer /= div_clock;
|
|
||||||
|
|
||||||
return (0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* timer without interrupts
|
|
||||||
*/
|
|
||||||
void reset_timer (void)
|
|
||||||
{
|
|
||||||
reset_timer_masked ();
|
|
||||||
}
|
|
||||||
|
|
||||||
ulong get_timer (ulong base_ticks)
|
|
||||||
{
|
|
||||||
return get_timer_masked () - base_ticks;
|
|
||||||
}
|
|
||||||
|
|
||||||
void set_timer (ulong ticks)
|
|
||||||
{
|
|
||||||
timestamp = ticks;
|
|
||||||
total_count = (unsigned long long)ticks * div_timer;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* delay usec useconds */
|
|
||||||
void udelay (unsigned long usec)
|
|
||||||
{
|
|
||||||
ulong tmo, tmp;
|
|
||||||
|
|
||||||
/* Convert to U-Boot ticks */
|
|
||||||
tmo = usec * CONFIG_SYS_HZ;
|
|
||||||
tmo /= (1000000L);
|
|
||||||
|
|
||||||
tmp = get_timer_masked(); /* get current timestamp */
|
|
||||||
tmo += tmp; /* form target timestamp */
|
|
||||||
|
|
||||||
while (get_timer_masked () < tmo) {/* loop till event */
|
|
||||||
/*NOP*/;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
void reset_timer_masked (void)
|
|
||||||
{
|
|
||||||
/* capure current decrementer value */
|
|
||||||
lastdec = (unsigned long long)READ_TIMER;
|
|
||||||
/* start "advancing" time stamp from 0 */
|
|
||||||
timestamp = 0L;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* converts the timer reading to U-Boot ticks */
|
|
||||||
/* the timestamp is the number of ticks since reset */
|
|
||||||
ulong get_timer_masked (void)
|
|
||||||
{
|
|
||||||
/* get current count */
|
|
||||||
unsigned long long now = (unsigned long long)READ_TIMER;
|
|
||||||
|
|
||||||
if(now > lastdec) {
|
|
||||||
/* Must have wrapped */
|
|
||||||
total_count += lastdec + TIMER_LOAD_VAL + 1 - now;
|
|
||||||
} else {
|
|
||||||
total_count += lastdec - now;
|
|
||||||
}
|
|
||||||
lastdec = now;
|
|
||||||
|
|
||||||
/* Reuse "now" */
|
|
||||||
now = total_count;
|
|
||||||
do_div(now, div_timer);
|
|
||||||
timestamp = now;
|
|
||||||
|
|
||||||
return timestamp;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* waits specified delay value and resets timestamp */
|
|
||||||
void udelay_masked (unsigned long usec)
|
|
||||||
{
|
|
||||||
udelay(usec);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* This function is derived from PowerPC code (read timebase as long long).
|
|
||||||
* On ARM it just returns the timer value.
|
|
||||||
*/
|
|
||||||
unsigned long long get_ticks(void)
|
|
||||||
{
|
|
||||||
return (unsigned long long)get_timer(0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Return the timebase clock frequency
|
|
||||||
* i.e. how often the timer decrements
|
|
||||||
*/
|
|
||||||
ulong get_tbclk (void)
|
|
||||||
{
|
|
||||||
return (ulong)(((unsigned long long)CONFIG_SYS_HZ_CLOCK)/div_clock);
|
|
||||||
}
|
|
||||||
|
|
|
@ -0,0 +1,176 @@
|
||||||
|
/*
|
||||||
|
* (C) Copyright 2002
|
||||||
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
||||||
|
* Marius Groeger <mgroeger@sysgo.de>
|
||||||
|
*
|
||||||
|
* (C) Copyright 2002
|
||||||
|
* David Mueller, ELSOFT AG, <d.mueller@elsoft.ch>
|
||||||
|
*
|
||||||
|
* (C) Copyright 2003
|
||||||
|
* Texas Instruments, <www.ti.com>
|
||||||
|
* Kshitij Gupta <Kshitij@ti.com>
|
||||||
|
*
|
||||||
|
* (C) Copyright 2004
|
||||||
|
* ARM Ltd.
|
||||||
|
* Philippe Robin, <philippe.robin@arm.com>
|
||||||
|
*
|
||||||
|
* See file CREDITS for list of people who contributed to this
|
||||||
|
* project.
|
||||||
|
*
|
||||||
|
* 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||||
|
* MA 02111-1307 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <common.h>
|
||||||
|
#include <div64.h>
|
||||||
|
|
||||||
|
/* The Integrator/CP timer1 is clocked at 1MHz
|
||||||
|
* can be divided by 16 or 256
|
||||||
|
* and can be set up as a 32-bit timer
|
||||||
|
*/
|
||||||
|
/* U-Boot expects a 32 bit timer, running at CONFIG_SYS_HZ */
|
||||||
|
/* Keep total timer count to avoid losing decrements < div_timer */
|
||||||
|
static unsigned long long total_count = 0;
|
||||||
|
static unsigned long long lastdec; /* Timer reading at last call */
|
||||||
|
static unsigned long long div_clock = 1; /* Divisor applied to timer clock */
|
||||||
|
static unsigned long long div_timer = 1; /* Divisor to convert timer reading
|
||||||
|
* change to U-Boot ticks
|
||||||
|
*/
|
||||||
|
/* CONFIG_SYS_HZ = CONFIG_SYS_HZ_CLOCK/(div_clock * div_timer) */
|
||||||
|
static ulong timestamp; /* U-Boot ticks since startup */
|
||||||
|
|
||||||
|
#define TIMER_LOAD_VAL ((ulong)0xFFFFFFFF)
|
||||||
|
#define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+4))
|
||||||
|
|
||||||
|
/* all function return values in U-Boot ticks i.e. (1/CONFIG_SYS_HZ) sec
|
||||||
|
* - unless otherwise stated
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* starts up a counter
|
||||||
|
* - the Integrator/CP timer can be set up to issue an interrupt */
|
||||||
|
int timer_init (void)
|
||||||
|
{
|
||||||
|
/* Load timer with initial value */
|
||||||
|
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL;
|
||||||
|
/* Set timer to be
|
||||||
|
* enabled 1
|
||||||
|
* periodic 1
|
||||||
|
* no interrupts 0
|
||||||
|
* X 0
|
||||||
|
* divider 1 00 == less rounding error
|
||||||
|
* 32 bit 1
|
||||||
|
* wrapping 0
|
||||||
|
*/
|
||||||
|
*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = 0x000000C2;
|
||||||
|
/* init the timestamp */
|
||||||
|
total_count = 0ULL;
|
||||||
|
reset_timer_masked();
|
||||||
|
|
||||||
|
div_timer = (unsigned long long)(CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ);
|
||||||
|
div_timer /= div_clock;
|
||||||
|
|
||||||
|
return (0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* timer without interrupts
|
||||||
|
*/
|
||||||
|
void reset_timer (void)
|
||||||
|
{
|
||||||
|
reset_timer_masked ();
|
||||||
|
}
|
||||||
|
|
||||||
|
ulong get_timer (ulong base_ticks)
|
||||||
|
{
|
||||||
|
return get_timer_masked () - base_ticks;
|
||||||
|
}
|
||||||
|
|
||||||
|
void set_timer (ulong ticks)
|
||||||
|
{
|
||||||
|
timestamp = ticks;
|
||||||
|
total_count = (unsigned long long)ticks * div_timer;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* delay usec useconds */
|
||||||
|
void udelay (unsigned long usec)
|
||||||
|
{
|
||||||
|
ulong tmo, tmp;
|
||||||
|
|
||||||
|
/* Convert to U-Boot ticks */
|
||||||
|
tmo = usec * CONFIG_SYS_HZ;
|
||||||
|
tmo /= (1000000L);
|
||||||
|
|
||||||
|
tmp = get_timer_masked(); /* get current timestamp */
|
||||||
|
tmo += tmp; /* form target timestamp */
|
||||||
|
|
||||||
|
while (get_timer_masked () < tmo) {/* loop till event */
|
||||||
|
/*NOP*/;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void reset_timer_masked (void)
|
||||||
|
{
|
||||||
|
/* capure current decrementer value */
|
||||||
|
lastdec = (unsigned long long)READ_TIMER;
|
||||||
|
/* start "advancing" time stamp from 0 */
|
||||||
|
timestamp = 0L;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* converts the timer reading to U-Boot ticks */
|
||||||
|
/* the timestamp is the number of ticks since reset */
|
||||||
|
ulong get_timer_masked (void)
|
||||||
|
{
|
||||||
|
/* get current count */
|
||||||
|
unsigned long long now = (unsigned long long)READ_TIMER;
|
||||||
|
|
||||||
|
if(now > lastdec) {
|
||||||
|
/* Must have wrapped */
|
||||||
|
total_count += lastdec + TIMER_LOAD_VAL + 1 - now;
|
||||||
|
} else {
|
||||||
|
total_count += lastdec - now;
|
||||||
|
}
|
||||||
|
lastdec = now;
|
||||||
|
|
||||||
|
/* Reuse "now" */
|
||||||
|
now = total_count;
|
||||||
|
do_div(now, div_timer);
|
||||||
|
timestamp = now;
|
||||||
|
|
||||||
|
return timestamp;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* waits specified delay value and resets timestamp */
|
||||||
|
void udelay_masked (unsigned long usec)
|
||||||
|
{
|
||||||
|
udelay(usec);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* This function is derived from PowerPC code (read timebase as long long).
|
||||||
|
* On ARM it just returns the timer value.
|
||||||
|
*/
|
||||||
|
unsigned long long get_ticks(void)
|
||||||
|
{
|
||||||
|
return (unsigned long long)get_timer(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Return the timebase clock frequency
|
||||||
|
* i.e. how often the timer decrements
|
||||||
|
*/
|
||||||
|
ulong get_tbclk (void)
|
||||||
|
{
|
||||||
|
return (ulong)(((unsigned long long)CONFIG_SYS_HZ_CLOCK)/div_clock);
|
||||||
|
}
|
Loading…
Reference in New Issue