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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#ifndef BOOTLOADER
#include "adc-target.h"
#include "button-target.h"
extern void TIMER1(void);
extern void TIMER2(void);
void __attribute__((interrupt("IRQ"))) irq_handler(void)
{
if(CURRENT_CORE == CPU)
{
if (CPU_INT_STAT & TIMER1_MASK)
TIMER1();
else if (CPU_INT_STAT & TIMER2_MASK)
TIMER2();
else if (CPU_INT_STAT & GPIO_MASK)
{
if (GPIOA_INT_STAT)
ipod_3g_button_int();
#ifdef IPOD_1G2G
if (GPIOB_INT_STAT & 0x04)
ipod_2g_adc_int();
#endif
}
}
else
{
if (COP_INT_STAT & TIMER2_MASK)
TIMER2();
}
}
#endif
/* 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
void ICODE_ATTR cpucache_flush(void)
{
intptr_t b, e;
for (b = (intptr_t)&CACHE_FLUSH_BASE, e = b + CACHE_SIZE;
b < e; b += 16) {
outl(0x0, b);
}
}
void ICODE_ATTR cpucache_invalidate(void)
{
intptr_t b, e;
/* Flush */
for (b = (intptr_t)&CACHE_FLUSH_BASE, e = b + CACHE_SIZE;
b < e; b += 16) {
outl(0x0, b);
}
/* Invalidate */
for (b = (intptr_t)&CACHE_INVALIDATE_BASE, e = b + CACHE_SIZE;
b < e; b += 16) {
outl(0x0, b);
}
}
static void ipod_init_cache(void)
{
intptr_t b, e;
/* Initialising the cache in the iPod bootloader prevents Rockbox from starting */
PROC_STAT &= ~0x700;
outl(0x4000, 0xcf004020);
CACHE_CTL = CACHE_CTL_INIT;
for (b = (intptr_t)&CACHE_INVALIDATE_BASE, e = b + CACHE_SIZE;
b < e; b += 16) {
outl(0x0, b);
}
/* Cache if (addr & mask) >> 16 == (mask & match) >> 16:
* yes: 0x00000000 - 0x03ffffff
* no: 0x04000000 - 0x1fffffff
* yes: 0x20000000 - 0x23ffffff
* no: 0x24000000 - 0x3fffffff <= range containing uncached alias
*/
CACHE_MASK = 0x00001c00;
CACHE_OPERATION = 0x3fc0;
CACHE_CTL = CACHE_CTL_INIT | CACHE_CTL_RUN;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
#else
static void pp_set_cpu_frequency(long frequency)
#endif
{
cpu_frequency = frequency;
PLL_CONTROL |= 0x6000; /* make sure some enable bits are set */
CLOCK_ENABLE = 0x01; /* select source #1 */
switch (frequency)
{
case CPUFREQ_MAX:
PLL_UNLOCK = 0xd19b; /* unlock frequencies > 66MHz */
CLOCK_SOURCE = 0xa9; /* source #1: 24 Mhz, source #2..#4: PLL */
PLL_CONTROL = 0xe000; /* PLL enabled */
PLL_DIV = 3; /* 10/3 * 24MHz */
PLL_MULT = 10;
udelay(200); /* wait for relock */
break;
case CPUFREQ_NORMAL:
CLOCK_SOURCE = 0xa9; /* source #1: 24 Mhz, source #2..#4: PLL */
PLL_CONTROL = 0xe000; /* PLL enabled */
PLL_DIV = 4; /* 5/4 * 24MHz */
PLL_MULT = 5;
udelay(200); /* wait for relock */
break;
case CPUFREQ_SLEEP:
CLOCK_SOURCE = 0x51; /* source #2: 32kHz, #1, #2, #4: 24MHz */
PLL_CONTROL = 0x6000; /* PLL disabled */
udelay(10000); /* let 32kHz source stabilize? */
break;
default:
CLOCK_SOURCE = 0x55; /* source #1..#4: 24 Mhz */
PLL_CONTROL = 0x6000; /* PLL disabled */
cpu_frequency = CPUFREQ_DEFAULT;
break;
}
CLOCK_ENABLE = 0x02; /* select source #2 */
}
#endif /* !BOOTLOADER */
void system_init(void)
{
#ifndef BOOTLOADER
if (CURRENT_CORE == CPU)
{
/* Remap the flash ROM on CPU, keep hidden from COP:
* 0x00000000-0x03ffffff = 0x20000000-0x23ffffff */
MMAP1_LOGICAL = 0x20003c00;
MMAP1_PHYSICAL = 0x00003f84;
#if defined(IPOD_1G2G) || defined(IPOD_3G)
DEV_EN = 0x0b9f; /* don't clock unused PP5002 hardware components */
outl(0x0035, 0xcf005004); /* DEV_EN2 ? */
#endif
INT_FORCED_CLR = -1;
CPU_INT_DIS = -1;
COP_INT_DIS = -1;
GPIOA_INT_EN = 0;
GPIOB_INT_EN = 0;
GPIOC_INT_EN = 0;
GPIOD_INT_EN = 0;
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
#if NUM_CORES > 1
cpu_boost_init();
#endif
#else
pp_set_cpu_frequency(CPUFREQ_MAX);
#endif
}
ipod_init_cache();
#endif
}
void system_reboot(void)
{
DEV_RS |= 4;
while (1);
}
void system_exception_wait(void)
{
/* FIXME: we just need the right buttons */
CPU_INT_DIS = -1;
COP_INT_DIS = -1;
/* Halt */
sleep_core(CURRENT_CORE);
while (1);
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
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