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11a72d9f
编写于
10月 27, 2002
作者:
W
wdenk
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48c0010d
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cpu/xscale/cpu.c
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cpu/xscale/cpu.c
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11a72d9f
/*
* (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>
*
* 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
*/
/*
* CPU specific code
*/
#include <common.h>
#include <command.h>
int
cpu_init
(
void
)
{
/*
* setup up stack if necessary
*/
/*
FIXME: the stack is _below_ the uboot code!!
#ifdef CONFIG_USE_IRQ
IRQ_STACK_START = _armboot_end +
CONFIG_STACKSIZE + CONFIG_STACKSIZE_IRQ - 4;
FIQ_STACK_START = IRQ_STACK_START + CONFIG_STACKSIZE_FIQ;
_armboot_real_end = FIQ_STACK_START + 4;
#else
_armboot_real_end = _armboot_end + CONFIG_STACKSIZE;
#endif
*/
return
(
0
);
}
int
cleanup_before_linux
(
void
)
{
/*
* this function is called just before we call linux
* it prepares the processor for linux
*
* just disable everything that can disturb booting linux
*/
unsigned
long
i
;
disable_interrupts
();
/* turn off I-cache */
asm
(
"mrc p15, 0, %0, c1, c0, 0"
:
"=r"
(
i
));
i
&=
~
0x1000
;
asm
(
"mcr p15, 0, %0, c1, c0, 0"
:
:
"r"
(
i
));
/* flush I-cache */
asm
(
"mcr p15, 0, %0, c7, c5, 0"
:
:
"r"
(
i
));
return
(
0
);
}
int
do_reset
(
cmd_tbl_t
*
cmdtp
,
int
flag
,
int
argc
,
char
*
argv
[])
{
extern
void
reset_cpu
(
ulong
addr
);
printf
(
"reseting ...
\n
"
);
udelay
(
50000
);
/* wait 50 ms */
disable_interrupts
();
reset_cpu
(
0
);
/*NOTREACHED*/
return
(
0
);
}
/* taken from blob */
void
icache_enable
(
void
)
{
register
u32
i
;
/* read control register */
asm
(
"mrc p15, 0, %0, c1, c0, 0"
:
"=r"
(
i
));
/* set i-cache */
i
|=
0x1000
;
/* write back to control register */
asm
(
"mcr p15, 0, %0, c1, c0, 0"
:
:
"r"
(
i
));
}
void
icache_disable
(
void
)
{
register
u32
i
;
/* read control register */
asm
(
"mrc p15, 0, %0, c1, c0, 0"
:
"=r"
(
i
));
/* clear i-cache */
i
&=
~
0x1000
;
/* write back to control register */
asm
(
"mcr p15, 0, %0, c1, c0, 0"
:
:
"r"
(
i
));
/* flush i-cache */
asm
(
"mcr p15, 0, %0, c7, c5, 0"
:
:
"r"
(
i
));
}
int
icache_status
(
void
)
{
register
u32
i
;
/* read control register */
asm
(
"mrc p15, 0, %0, c1, c0, 0"
:
"=r"
(
i
));
/* return bit */
return
(
i
&
0x1000
);
}
/* we will never enable dcache, because we have to setup MMU first */
void
dcache_enable
(
void
)
{
return
;
}
void
dcache_disable
(
void
)
{
return
;
}
int
dcache_status
(
void
)
{
return
0
;
/* always off */
}
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