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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"
#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));
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);
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
};
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"
};
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; /* Read clears the corresponding IRQ status */
if ((irq_no & (1<<31)) == 0) /* Ensure invalid flag is not set */
{
irqvector[irq_no]();
}
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_handler(void)
{
asm volatile (
"subs pc, lr, #4 \r\n"
);
}
static void gpio_init(void)
{
}
static void clock_init(void)
{
}
void system_init(void)
{
}
void system_reboot(void)
{
}
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;
/* CPU/COP frequencies can be scaled between Fbus (min) and Fsys (max).
Fbus should not be set below ~32Mhz with LCD enabled or the display
will be garbled. */
if (frequency == CPUFREQ_MAX)
{
}
else if (frequency == CPUFREQ_NORMAL)
{
}
else
{
}
asm volatile (
"nop \n\t"
"nop \n\t"
"nop \n\t"
);
cpu_frequency = frequency;
}
#endif
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