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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Rob Purchase
*
* 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 "kernel.h"
#include "system.h"
#include "panic.h"
#ifdef IPOD_NANO2G
#include "storage.h"
#include "pmu-target.h"
#endif
#define default_interrupt(name) \
extern __attribute__((weak,alias("UIRQ"))) void name (void)
void irq_handler(void) __attribute__((interrupt ("IRQ"), naked));
void fiq_handler(void) __attribute__((interrupt ("FIQ"), naked, \
weak, alias("fiq_dummy")));
default_interrupt(EXT0);
default_interrupt(EXT1);
default_interrupt(EXT2);
default_interrupt(EINT_VBUS);
default_interrupt(EINTG);
default_interrupt(INT_TIMERA);
default_interrupt(INT_WDT);
default_interrupt(INT_TIMERB);
default_interrupt(INT_TIMERC);
default_interrupt(INT_TIMERD);
default_interrupt(INT_DMA);
default_interrupt(INT_ALARM_RTC);
default_interrupt(INT_PRI_RTC);
default_interrupt(RESERVED1);
default_interrupt(INT_UART);
default_interrupt(INT_USB_HOST);
default_interrupt(INT_USB_FUNC);
default_interrupt(INT_LCDC_0);
default_interrupt(INT_LCDC_1);
default_interrupt(INT_ECC);
default_interrupt(INT_CALM);
default_interrupt(INT_ATA);
default_interrupt(INT_UART0);
default_interrupt(INT_SPDIF_OUT);
default_interrupt(INT_SDCI);
default_interrupt(INT_LCD);
default_interrupt(INT_SPI);
default_interrupt(INT_IIC);
default_interrupt(RESERVED2);
default_interrupt(INT_MSTICK);
default_interrupt(INT_ADC_WAKEUP);
default_interrupt(INT_ADC);
default_interrupt(INT_UNK1);
default_interrupt(INT_UNK2);
default_interrupt(INT_UNK3);
void INT_TIMER(void)
{
if (TACON & 0x00038000) INT_TIMERA();
if (TBCON & 0x00038000) INT_TIMERB();
if (TCCON & 0x00038000) INT_TIMERC();
if (TDCON & 0x00038000) INT_TIMERD();
}
#if CONFIG_CPU==S5L8701
static void (* const irqvector[])(void) =
{ /* still 90% unverified and probably incorrect */
EXT0,EXT1,EXT2,EINT_VBUS,EINTG,INT_TIMER,INT_WDT,INT_UNK1,
INT_UNK2,INT_UNK3,INT_DMA,INT_ALARM_RTC,INT_PRI_RTC,RESERVED1,INT_UART,INT_USB_HOST,
INT_USB_FUNC,INT_LCDC_0,INT_LCDC_1,INT_CALM,INT_ATA,INT_UART0,INT_SPDIF_OUT,INT_ECC,
INT_SDCI,INT_LCD,INT_SPI,INT_IIC,RESERVED2,INT_MSTICK,INT_ADC_WAKEUP,INT_ADC
};
#else
static void (* const irqvector[])(void) =
{
EXT0,EXT1,EXT2,EINT_VBUS,EINTG,INT_TIMERA,INT_WDT,INT_TIMERB,
INT_TIMERC,INT_TIMERD,INT_DMA,INT_ALARM_RTC,INT_PRI_RTC,RESERVED1,INT_UART,INT_USB_HOST,
INT_USB_FUNC,INT_LCDC_0,INT_LCDC_1,INT_ECC,INT_CALM,INT_ATA,INT_UART0,INT_SPDIF_OUT,
INT_SDCI,INT_LCD,INT_SPI,INT_IIC,RESERVED2,INT_MSTICK,INT_ADC_WAKEUP,INT_ADC
};
#endif
#if CONFIG_CPU==S5L8701
static const char * const irqname[] =
{ /* still 90% unverified and probably incorrect */
"EXT0","EXT1","EXT2","EINT_VBUS","EINTG","INT_TIMER","INT_WDT","INT_UNK1",
"INT_UNK2","INT_UNK3","INT_DMA","INT_ALARM_RTC","INT_PRI_RTC","Reserved","INT_UART","INT_USB_HOST",
"INT_USB_FUNC","INT_LCDC_0","INT_LCDC_1","INT_CALM","INT_ATA","INT_UART0","INT_SPDIF_OUT","INT_ECC",
"INT_SDCI","INT_LCD","INT_SPI","INT_IIC","Reserved","INT_MSTICK","INT_ADC_WAKEUP","INT_ADC"
};
#else
static const char * const irqname[] =
{
"EXT0","EXT1","EXT2","EINT_VBUS","EINTG","INT_TIMERA","INT_WDT","INT_TIMERB",
"INT_TIMERC","INT_TIMERD","INT_DMA","INT_ALARM_RTC","INT_PRI_RTC","Reserved","INT_UART","INT_USB_HOST",
"INT_USB_FUNC","INT_LCDC_0","INT_LCDC_1","INT_ECC","INT_CALM","INT_ATA","INT_UART0","INT_SPDIF_OUT",
"INT_SDCI","INT_LCD","INT_SPI","INT_IIC","Reserved","INT_MSTICK","INT_ADC_WAKEUP","INT_ADC"
};
#endif
static void UIRQ(void)
{
unsigned int offset = INTOFFSET;
panicf("Unhandled IRQ %02X: %s", offset, irqname[offset]);
}
void irq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
asm volatile( "stmfd sp!, {r0-r7, ip, lr} \n" /* Store context */
"sub sp, sp, #8 \n"); /* Reserve stack */
int irq_no = INTOFFSET;
irqvector[irq_no]();
/* clear interrupt */
SRCPND = (1 << irq_no);
INTPND = INTPND;
asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */
"ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */
"subs pc, lr, #4 \n"); /* Return from IRQ */
}
void fiq_dummy(void)
{
asm volatile (
"subs pc, lr, #4 \r\n"
);
}
void system_init(void)
{
#ifdef IPOD_NANO2G
pmu_init();
#endif
}
void system_reboot(void)
{
#ifdef IPOD_NANO2G
#ifdef HAVE_STORAGE_FLUSH
storage_flush();
#endif
/* Reset the SoC */
asm volatile("msr CPSR_c, #0xd3 \n"
"mov r5, #0x110000 \n"
"add r5, r5, #0xff \n"
"add r6, r5, #0xa00 \n"
"mov r10, #0x3c800000 \n"
"str r6, [r10] \n"
"mov r6, #0xff0 \n"
"str r6, [r10,#4] \n"
"str r5, [r10] \n");
/* Wait for reboot to kick in */
while(1);
#endif
}
void system_exception_wait(void)
{
while(1);
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
if (cpu_frequency == frequency)
return;
int oldlevel = disable_irq_save();
#if 1
if (frequency == CPUFREQ_MAX)
{
/* FCLK_CPU = PLL0, HCLK = PLL0 / 2 */
CLKCON = (CLKCON & ~0xFF00FF00) | 0x20003100;
/* PCLK = HCLK / 2 */
CLKCON2 |= 0x200;
/* Switch to ASYNCHRONOUS mode */
asm volatile(
"mrc p15, 0, r0,c1,c0 \n\t"
"orr r0, r0, #0xc0000000 \n\t"
"mcr p15, 0, r0,c1,c0 \n\t"
::: "r0"
);
}
else
{
/* Switch to FASTBUS mode */
asm volatile(
"mrc p15, 0, r0,c1,c0 \n\t"
"bic r0, r0, #0xc0000000 \n\t"
"mcr p15, 0, r0,c1,c0 \n\t"
::: "r0"
);
/* PCLK = HCLK */
CLKCON2 &= ~0x200;
/* FCLK_CPU = OFF, HCLK = PLL0 / 4 */
CLKCON = (CLKCON & ~0xFF00FF00) | 0x80003300;
}
#else /* Alternative: Also clock down the PLL. Doesn't seem to save much
current, but results in high switching latency. */
if (frequency == CPUFREQ_MAX)
{
CLKCON &= ~0xFF00FF00; /* Everything back to the OSC */
PLLCON &= ~1; /* Power down PLL0 */
PLL0PMS = 0x021200; /* 192 MHz */
PLL0LCNT = 8100;
PLLCON |= 1; /* Power up PLL0 */
while (!(PLLLOCK & 1)); /* Wait for PLL to lock */
CLKCON2 |= 0x200; /* PCLK = HCLK / 2 */
CLKCON |= 0x20003100; /* FCLK_CPU = PLL0, PCLK = PLL0 / 2 */
}
else
{
CLKCON &= ~0xFF00FF00; /* Everything back to the OSC */
CLKCON2 &= ~0x200; /* PCLK = HCLK */
PLLCON &= ~1; /* Power down PLL0 */
PLL0PMS = 0x000500; /* 48 MHz */
PLL0LCNT = 8100;
PLLCON |= 1; /* Power up PLL0 */
while (!(PLLLOCK & 1)); /* Wait for PLL to lock */
CLKCON |= 0x20002000; /* FCLK_CPU = PLL0, PCLK = PLL0 */
}
#endif
cpu_frequency = frequency;
restore_irq(oldlevel);
}
#endif
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