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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
unsigned int ipod_hw_rev;
#ifndef BOOTLOADER
extern void TIMER1(void);
extern void TIMER2(void);
void irq(void)
{
if(CURRENT_CORE == CPU)
{
if (CPU_INT_STAT & TIMER1_MASK)
TIMER1();
else if (CPU_INT_STAT & TIMER2_MASK)
TIMER2();
} else {
if (COP_INT_STAT & TIMER1_MASK)
TIMER1();
else if (COP_INT_STAT & TIMER2_MASK)
TIMER2();
}
}
#endif
unsigned int current_core(void)
{
if(((*(volatile unsigned long *)(0xc4000000)) & 0xff) == 0x55)
{
return CPU;
}
return COP;
}
/* TODO: The following two function have been lifted straight from IPL, and
hence have a lot of numeric addresses used straight. I'd like to use
#defines for these, but don't know what most of them are for or even what
they should be named. Because of this I also have no way of knowing how
to extend the funtions to do alternate cache configurations and/or
some other CPU frequency scaling. */
#ifndef BOOTLOADER
static void ipod_init_cache(void)
{
int i =0;
/* Initialising the cache in the iPod bootloader prevents Rockbox from starting */
outl(inl(0xcf004050) & ~0x700, 0xcf004050);
outl(0x4000, 0xcf004020);
outl(0x2, 0xcf004024);
/* PP5002 has 8KB cache */
for (i = 0xf0004000; i < (int)(0xf0006000); i += 16) {
outl(0x0, i);
}
outl(0x0, 0xf000f020);
outl(0x3fc0, 0xf000f024);
outl(0x3, 0xcf004024);
}
#endif
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
unsigned long postmult;
if (CURRENT_CORE == CPU)
{
if (frequency == CPUFREQ_NORMAL)
postmult = CPUFREQ_NORMAL_MULT;
else if (frequency == CPUFREQ_MAX)
postmult = CPUFREQ_MAX_MULT;
else
postmult = CPUFREQ_DEFAULT_MULT;
cpu_frequency = frequency;
outl(0x02, 0xcf005008);
outl(0x55, 0xcf00500c);
outl(0x6000, 0xcf005010);
/* Clock frequency = (24/8)*postmult */
outl(8, 0xcf005018);
outl(postmult, 0xcf00501c);
outl(0xe000, 0xcf005010);
/* Wait for PLL relock? */
udelay(2000);
/* Select PLL as clock source? */
outl(0xa8, 0xcf00500c);
}
}
#elif !defined(BOOTLOADER)
static void ipod_set_cpu_speed(void)
{
outl(0x02, 0xcf005008);
outl(0x55, 0xcf00500c);
outl(0x6000, 0xcf005010);
#if 1
// 75 MHz (24/24 * 75) (default)
outl(24, 0xcf005018);
outl(75, 0xcf00501c);
#endif
#if 0
// 66 MHz (24/3 * 8)
outl(3, 0xcf005018);
outl(8, 0xcf00501c);
#endif
outl(0xe000, 0xcf005010);
udelay(2000);
outl(0xa8, 0xcf00500c);
}
#endif
void system_init(void)
{
#ifndef BOOTLOADER
if (CURRENT_CORE == CPU)
{
/* Remap the flash ROM from 0x00000000 to 0x20000000. */
MMAP3_LOGICAL = 0x20000000 | 0x3a00;
MMAP3_PHYSICAL = 0x00000000 | 0x3f84;
ipod_hw_rev = (*((volatile unsigned long*)(0x01fffffc)));
outl(-1, 0xcf00101c);
outl(-1, 0xcf001028);
outl(-1, 0xcf001038);
#ifndef HAVE_ADJUSTABLE_CPU_FREQ
ipod_set_cpu_speed();
#endif
}
ipod_init_cache();
#endif
}
void system_reboot(void)
{
outl(inl(0xcf005030) | 0x4, 0xcf005030);
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
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