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/*
* (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>
#include <AT91RM9200.h>
/* read co-processor 15, register #1 (control register) */
static unsigned long read_p15_c1(void)
{
unsigned long value;
__asm__ __volatile__(
"mrc p15, 0, %0, c1, c0, 0 @ read control reg\n"
: "=r" (value)
:
: "memory");
/*printf("p15/c1 is = %08lx\n", value); */
return value;
}
/* write to co-processor 15, register #1 (control register) */
static void write_p15_c1(unsigned long value)
{
/*printf("write %08lx to p15/c1\n", value); */
__asm__ __volatile__(
"mcr p15, 0, %0, c1, c0, 0 @ write it back\n"
: "=r" (value)
:
: "memory");
read_p15_c1();
}
static void cp_delay(void)
{
volatile int i;
/* copro seems to need some delay between reading and writing */
for (i=0; i<100; i++);
}
/* See also ARM Ref. Man. */
#define C1_MMU (1<<0) /* mmu off/on */
#define C1_ALIGN (1<<1) /* alignment faults off/on */
#define C1_IDC (1<<2) /* icache and/or dcache off/on */
#define C1_WRITE_BUFFER (1<<3) /* write buffer off/on */
#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */
#define C1_SYS_PROT (1<<8) /* system protection */
#define C1_ROM_PROT (1<<9) /* ROM protection */
#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */
int cpu_init(void)
{
/*
* setup up stack if necessary
*/
#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
*
* we turn off caches etc ...
* and we set the CPU-speed to 73 MHz - see start.S for details
*/
disable_interrupts();
return 0;
}
int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
#ifdef CFG_SOFT_RESET
extern void reset_cpu(ulong addr);
disable_interrupts();
reset_cpu(0);
#else
AT91PS_USART us = AT91C_BASE_US1;
AT91PS_PIO pio = AT91C_BASE_PIOA;
/*shutdown the console to avoid strange chars during reset */
us->US_CR = (AT91C_US_RSTRX | AT91C_US_RSTTX);
/* Clear PA19 to trigger the hard reset */
pio->PIO_CODR = 0x00080000;
pio->PIO_OER = 0x00080000;
pio->PIO_PER = 0x00080000;
/* Never reached */
#endif
return 0;
}
void icache_enable(void)
{
ulong reg;
reg = read_p15_c1();
cp_delay();
write_p15_c1(reg | C1_IDC);
}
void icache_disable(void)
{
ulong reg;
reg = read_p15_c1();
cp_delay();
write_p15_c1(reg & ~C1_IDC);
}
int icache_status(void)
{
return (read_p15_c1() & C1_IDC) != 0;
return 0;
}
void dcache_enable(void)
{
ulong reg;
reg = read_p15_c1();
cp_delay();
write_p15_c1(reg | C1_IDC);
}
void dcache_disable(void)
{
ulong reg;
reg = read_p15_c1();
cp_delay();
write_p15_c1(reg & ~C1_IDC);
}
int dcache_status(void)
{
return (read_p15_c1() & C1_IDC) != 0;
return 0;
}
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