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Apply SoC concept to arm926ejs CPUs, i.e. move the SoC specific timer and

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cpu_reset code from cpu/$(CPU) into the new cpu/$(CPU)/$(SOC) directories
Patch by Andreas Engel, 13 Mar 2006
This commit is contained in:
Wolfgang Denk 2006-03-13 12:37:35 +01:00
parent 86f5f0342d
commit ff7fefe679
11 changed files with 540 additions and 171 deletions
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5
CHANGELOG
View file

@ -2,6 +2,11 @@
Changes since U-Boot 1.1.4:
======================================================================
* Apply SoC concept to arm926ejs CPUs, i.e. move the SoC specific
timer and cpu_reset code from cpu/$(CPU) into the new
cpu/$(CPU)/$(SOC) directories
Patch by Andreas Engel, 13 Mar 2006
* Change max size of uncompressed uImage's to 8MByte and add
CFG_BOOTM_LEN to adjust this setting.

6
Makefile
View file

@ -1514,7 +1514,7 @@ omap1510inn_config : unconfig
@./mkconfig $(@:_config=) arm arm925t omap1510inn
omap5912osk_config : unconfig
@./mkconfig $(@:_config=) arm arm926ejs omap5912osk
@./mkconfig $(@:_config=) arm arm926ejs omap5912osk NULL omap
omap1610inn_config \
omap1610inn_cs0boot_config \
@ -1534,7 +1534,7 @@ omap1610h2_cs_autoboot_config: unconfig
echo "#define CONFIG_CS3_BOOT" >> ./include/config.h ; \
echo "... configured for CS3 boot"; \
fi;
@./mkconfig -a $(call xtract_omap1610xxx,$@) arm arm926ejs omap1610inn
@./mkconfig -a $(call xtract_omap1610xxx,$@) arm arm926ejs omap1610inn NULL omap
omap730p2_config \
omap730p2_cs0boot_config \
@ -1546,7 +1546,7 @@ omap730p2_cs3boot_config : unconfig
echo "#define CONFIG_CS3_BOOT" >> ./include/config.h ; \
echo "... configured for CS3 boot"; \
fi;
@./mkconfig -a $(call xtract_omap730p2,$@) arm arm926ejs omap730p2
@./mkconfig -a $(call xtract_omap730p2,$@) arm arm926ejs omap730p2 NULL omap
scb9328_config : unconfig
@./mkconfig $(@:_config=) arm arm920t scb9328 NULL imx

2
board/versatile/split_by_variant.sh
View file

@ -36,5 +36,5 @@ fi
# ---------------------------------------------------------
# Complete the configuration
# ---------------------------------------------------------
./mkconfig -a versatile arm arm926ejs versatile
./mkconfig -a versatile arm arm926ejs versatile NULL versatile
echo "Variant:: $variant"

148
cpu/arm926ejs/interrupts.c
View file

@ -39,16 +39,6 @@
#include <arm926ejs.h>
#include <asm/proc-armv/ptrace.h>
#define TIMER_LOAD_VAL 0xffffffff
/* macro to read the 32 bit timer */
#ifdef CONFIG_OMAP
#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8))
#endif
#ifdef CONFIG_VERSATILE
#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+4))
#endif
#ifdef CONFIG_USE_IRQ
/* enable IRQ interrupts */
void enable_interrupts (void)
@ -188,146 +178,14 @@ void do_irq (struct pt_regs *pt_regs)
#else
static ulong timestamp;
static ulong lastdec;
/* nothing really to do with interrupts, just starts up a counter. */
int interrupt_init (void)
{
#ifdef CONFIG_OMAP
int32_t val;
extern void timer_init(void);
/* Start the decrementer ticking down from 0xffffffff */
*((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT);
*((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val;
#endif /* CONFIG_OMAP */
timer_init();
#ifdef CONFIG_VERSATILE
*(volatile ulong *)(CFG_TIMERBASE + 0) = CFG_TIMER_RELOAD; /* TimerLoad */
*(volatile ulong *)(CFG_TIMERBASE + 4) = CFG_TIMER_RELOAD; /* TimerValue */
*(volatile ulong *)(CFG_TIMERBASE + 8) = 0x8C;
#endif /* CONFIG_VERSATILE */
/* init the timestamp and lastdec value */
reset_timer_masked();
return (0);
}
/*
* timer without interrupts
*/
void reset_timer (void)
{
reset_timer_masked ();
}
ulong get_timer (ulong base)
{
return get_timer_masked () - base;
}
void set_timer (ulong t)
{
timestamp = t;
}
/* delay x useconds AND perserve advance timstamp value */
void udelay (unsigned long usec)
{
ulong tmo, tmp;
if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
}else{ /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
tmp = get_timer (0); /* get current timestamp */
if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */
reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */
else
tmo += tmp; /* else, set advancing stamp wake up time */
while (get_timer_masked () < tmo)/* loop till event */
/*NOP*/;
}
void reset_timer_masked (void)
{
/* reset time */
lastdec = READ_TIMER; /* capure current decrementer value time */
timestamp = 0; /* start "advancing" time stamp from 0 */
}
ulong get_timer_masked (void)
{
ulong now = READ_TIMER; /* current tick value */
if (lastdec >= now) { /* normal mode (non roll) */
/* normal mode */
timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
} else { /* we have overflow of the count down timer */
/* nts = ts + ld + (TLV - now)
* ts=old stamp, ld=time that passed before passing through -1
* (TLV-now) amount of time after passing though -1
* nts = new "advancing time stamp"...it could also roll and cause problems.
*/
timestamp += lastdec + TIMER_LOAD_VAL - now;
}
lastdec = now;
return timestamp;
}
/* waits specified delay value and resets timestamp */
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
} else { /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
endtime = get_timer_masked () + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*
* 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 get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk (void)
{
ulong tbclk;
tbclk = CFG_HZ;
return tbclk;
return 0;
}
#endif /* CONFIG_INTEGRATOR */

43
cpu/arm926ejs/omap/Makefile Normal file
View file

@ -0,0 +1,43 @@
#
# (C) Copyright 2000-2005
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# 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 $(TOPDIR)/config.mk
LIB = lib$(SOC).a
OBJS = timer.o
SOBJS = reset.o
all: .depend $(LIB)
$(LIB): $(OBJS) $(SOBJS)
$(AR) crv $@ $(OBJS) $(SOBJS)
#########################################################################
.depend: Makefile $(OBJS:.o=.c)
$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
sinclude .depend
#########################################################################

45
cpu/arm926ejs/omap/reset.S Normal file
View file

@ -0,0 +1,45 @@
/*
* armboot - Startup Code for ARM926EJS CPU-core
*
* Copyright (c) 2003 Texas Instruments
*
* ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
*
* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
* Copyright (c) 2002 Gary Jennejohn <gj@denx.de>
* Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
* Copyright (c) 2003 Kshitij <kshitij@ti.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
*/
.align 5
.globl reset_cpu
reset_cpu:
ldr r1, rstctl1 /* get clkm1 reset ctl */
mov r3, #0x0
strh r3, [r1] /* clear it */
mov r3, #0x8
strh r3, [r1] /* force dsp+arm reset */
_loop_forever:
b _loop_forever
rstctl1:
.word 0xfffece10

177
cpu/arm926ejs/omap/timer.c Normal file
View file

@ -0,0 +1,177 @@
/*
* (C) Copyright 2003
* Texas Instruments <www.ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002-2004
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* (C) Copyright 2004
* Philippe Robin, ARM Ltd. <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 <arm926ejs.h>
#define TIMER_LOAD_VAL 0xffffffff
/* macro to read the 32 bit timer */
#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+8))
static ulong timestamp;
static ulong lastdec;
int timer_init (void)
{
int32_t val;
/* Start the decrementer ticking down from 0xffffffff */
*((int32_t *) (CFG_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CFG_PVT << MPUTIM_PTV_BIT);
*((int32_t *) (CFG_TIMERBASE + CNTL_TIMER)) = val;
/* init the timestamp and lastdec value */
reset_timer_masked();
return 0;
}
/*
* timer without interrupts
*/
void reset_timer (void)
{
reset_timer_masked ();
}
ulong get_timer (ulong base)
{
return get_timer_masked () - base;
}
void set_timer (ulong t)
{
timestamp = t;
}
/* delay x useconds AND perserve advance timstamp value */
void udelay (unsigned long usec)
{
ulong tmo, tmp;
if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
}else{ /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
tmp = get_timer (0); /* get current timestamp */
if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */
reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */
else
tmo += tmp; /* else, set advancing stamp wake up time */
while (get_timer_masked () < tmo)/* loop till event */
/*NOP*/;
}
void reset_timer_masked (void)
{
/* reset time */
lastdec = READ_TIMER; /* capure current decrementer value time */
timestamp = 0; /* start "advancing" time stamp from 0 */
}
ulong get_timer_masked (void)
{
ulong now = READ_TIMER; /* current tick value */
if (lastdec >= now) { /* normal mode (non roll) */
/* normal mode */
timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
} else { /* we have overflow of the count down timer */
/* nts = ts + ld + (TLV - now)
* ts=old stamp, ld=time that passed before passing through -1
* (TLV-now) amount of time after passing though -1
* nts = new "advancing time stamp"...it could also roll and cause problems.
*/
timestamp += lastdec + TIMER_LOAD_VAL - now;
}
lastdec = now;
return timestamp;
}
/* waits specified delay value and resets timestamp */
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
} else { /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
endtime = get_timer_masked () + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*
* 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 get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk (void)
{
ulong tbclk;
tbclk = CFG_HZ;
return tbclk;
}

22
cpu/arm926ejs/start.S
View file

@ -392,25 +392,3 @@ fiq:
bl do_fiq
#endif
# ifdef CONFIG_INTEGRATOR
/* Satisfied by Integrator routine (AP or CP) */
#else
.align 5
.globl reset_cpu
reset_cpu:
ldr r1, rstctl1 /* get clkm1 reset ctl */
mov r3, #0x0
strh r3, [r1] /* clear it */
mov r3, #0x8
strh r3, [r1] /* force dsp+arm reset */
_loop_forever:
b _loop_forever
rstctl1:
.word 0xfffece10
#endif /* #ifdef CONFIG_INTEGRATOR */

43
cpu/arm926ejs/versatile/Makefile Normal file
View file

@ -0,0 +1,43 @@
#
# (C) Copyright 2000-2005
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# 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 $(TOPDIR)/config.mk
LIB = lib$(SOC).a
OBJS = timer.o
SOBJS = reset.o
all: .depend $(LIB)
$(LIB): $(OBJS) $(SOBJS)
$(AR) crv $@ $(OBJS) $(SOBJS)
#########################################################################
.depend: Makefile $(OBJS:.o=.c)
$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
sinclude .depend
#########################################################################

45
cpu/arm926ejs/versatile/reset.S Normal file
View file

@ -0,0 +1,45 @@
/*
* armboot - Startup Code for ARM926EJS CPU-core
*
* Copyright (c) 2003 Texas Instruments
*
* ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------
*
* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
* Copyright (c) 2002 Gary Jennejohn <gj@denx.de>
* Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
* Copyright (c) 2003 Kshitij <kshitij@ti.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
*/
.align 5
.globl reset_cpu
reset_cpu:
ldr r1, rstctl1 /* get clkm1 reset ctl */
mov r3, #0x0
strh r3, [r1] /* clear it */
mov r3, #0x8
strh r3, [r1] /* force dsp+arm reset */
_loop_forever:
b _loop_forever
rstctl1:
.word 0xfffece10

175
cpu/arm926ejs/versatile/timer.c Normal file
View file

@ -0,0 +1,175 @@
/*
* (C) Copyright 2003
* Texas Instruments <www.ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002-2004
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* (C) Copyright 2004
* Philippe Robin, ARM Ltd. <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 <arm926ejs.h>
#define TIMER_LOAD_VAL 0xffffffff
/* macro to read the 32 bit timer */
#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+4))
static ulong timestamp;
static ulong lastdec;
/* nothing really to do with interrupts, just starts up a counter. */
int timer_init (void)
{
*(volatile ulong *)(CFG_TIMERBASE + 0) = CFG_TIMER_RELOAD; /* TimerLoad */
*(volatile ulong *)(CFG_TIMERBASE + 4) = CFG_TIMER_RELOAD; /* TimerValue */
*(volatile ulong *)(CFG_TIMERBASE + 8) = 0x8C;
/* init the timestamp and lastdec value */
reset_timer_masked();
return 0;
}
/*
* timer without interrupts
*/
void reset_timer (void)
{
reset_timer_masked ();
}
ulong get_timer (ulong base)
{
return get_timer_masked () - base;
}
void set_timer (ulong t)
{
timestamp = t;
}
/* delay x useconds AND perserve advance timstamp value */
void udelay (unsigned long usec)
{
ulong tmo, tmp;
if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
}else{ /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
tmp = get_timer (0); /* get current timestamp */
if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */
reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */
else
tmo += tmp; /* else, set advancing stamp wake up time */
while (get_timer_masked () < tmo)/* loop till event */
/*NOP*/;
}
void reset_timer_masked (void)
{
/* reset time */
lastdec = READ_TIMER; /* capure current decrementer value time */
timestamp = 0; /* start "advancing" time stamp from 0 */
}
ulong get_timer_masked (void)
{
ulong now = READ_TIMER; /* current tick value */
if (lastdec >= now) { /* normal mode (non roll) */
/* normal mode */
timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
} else { /* we have overflow of the count down timer */
/* nts = ts + ld + (TLV - now)
* ts=old stamp, ld=time that passed before passing through -1
* (TLV-now) amount of time after passing though -1
* nts = new "advancing time stamp"...it could also roll and cause problems.
*/
timestamp += lastdec + TIMER_LOAD_VAL - now;
}
lastdec = now;
return timestamp;
}
/* waits specified delay value and resets timestamp */
void udelay_masked (unsigned long usec)
{
ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
tmo /= 1000; /* finish normalize. */
} else { /* else small number, don't kill it prior to HZ multiply */
tmo = usec * CFG_HZ;
tmo /= (1000*1000);
}
endtime = get_timer_masked () + tmo;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*
* 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 get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk (void)
{
ulong tbclk;
tbclk = CFG_HZ;
return tbclk;
}