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/*
* (C) Copyright 2008 Texas Insturments
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <gj@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
*/
/*
* CPU specific code
*/
#include <common.h>
#include <command.h>
#include <asm/arch/sys_proto.h>
#include <asm/system.h>
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#ifdef CONFIG_USE_IRQ
DECLARE_GLOBAL_DATA_PTR;
#endif
#ifndef CONFIG_L2_OFF
void l2cache_disable(void);
#endif
static void cache_flush(void);
int cpu_init(void)
{
/*
* setup up stacks if necessary
*/
#ifdef CONFIG_USE_IRQ
IRQ_STACK_START =
_armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
#endif
return 0;
}
int cleanup_before_linux(void)
{
unsigned int i;
/*
* this function is called just before we call linux
* it prepares the processor for linux
*
* we turn off caches etc ...
*/
disable_interrupts();
/* turn off I/D-cache */
icache_disable();
dcache_disable();
/* invalidate I-cache */
cache_flush();
#ifndef CONFIG_L2_OFF
/* turn off L2 cache */
l2cache_disable();
/* invalidate L2 cache also */
v7_flush_dcache_all(get_device_type());
#endif
i = 0;
/* mem barrier to sync up things */
asm("mcr p15, 0, %0, c7, c10, 4": :"r"(i));
#ifndef CONFIG_L2_OFF
l2cache_enable();
#endif
return 0;
}
void l2cache_enable()
{
unsigned long i;
volatile unsigned int j;
/* ES2 onwards we can disable/enable L2 ourselves */
if (get_cpu_rev() >= CPU_3XX_ES20) {
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__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
__asm__ __volatile__("orr %0, %0, #0x2":"=r"(i));
__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
} else {
/* Save r0, r12 and restore them after usage */
__asm__ __volatile__("mov %0, r12":"=r"(j));
__asm__ __volatile__("mov %0, r0":"=r"(i));
/*
* GP Device ROM code API usage here
* r12 = AUXCR Write function and r0 value
*/
__asm__ __volatile__("mov r12, #0x3");
__asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
__asm__ __volatile__("orr r0, r0, #0x2");
/* SMI instruction to call ROM Code API */
__asm__ __volatile__(".word 0xE1600070");
__asm__ __volatile__("mov r0, %0":"=r"(i));
__asm__ __volatile__("mov r12, %0":"=r"(j));
}
}
void l2cache_disable()
{
unsigned long i;
volatile unsigned int j;
/* ES2 onwards we can disable/enable L2 ourselves */
if (get_cpu_rev() >= CPU_3XX_ES20) {
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__asm__ __volatile__("mrc p15, 0, %0, c1, c0, 1":"=r"(i));
__asm__ __volatile__("bic %0, %0, #0x2":"=r"(i));
__asm__ __volatile__("mcr p15, 0, %0, c1, c0, 1":"=r"(i));
} else {
/* Save r0, r12 and restore them after usage */
__asm__ __volatile__("mov %0, r12":"=r"(j));
__asm__ __volatile__("mov %0, r0":"=r"(i));
/*
* GP Device ROM code API usage here
* r12 = AUXCR Write function and r0 value
*/
__asm__ __volatile__("mov r12, #0x3");
__asm__ __volatile__("mrc p15, 0, r0, c1, c0, 1");
__asm__ __volatile__("bic r0, r0, #0x2");
/* SMI instruction to call ROM Code API */
__asm__ __volatile__(".word 0xE1600070");
__asm__ __volatile__("mov r0, %0":"=r"(i));
__asm__ __volatile__("mov r12, %0":"=r"(j));
}
}
static void cache_flush(void)
{
asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (0));
}