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#include "kernel.h"
#include "system.h"
#include "panic.h"
#include "mmu-meg-fx.h"
#define default_interrupt(name) \
extern __attribute__((weak,alias("UIRQ"))) void name (void)
default_interrupt(EINT0);
default_interrupt(EINT1);
default_interrupt(EINT2);
default_interrupt(EINT3);
default_interrupt(EINT4_7);
default_interrupt(EINT8_23);
default_interrupt(CAM);
default_interrupt(nBATT_FLT);
default_interrupt(TICK);
default_interrupt(WDT_AC97);
default_interrupt(TIMER0);
default_interrupt(TIMER1);
default_interrupt(TIMER2);
default_interrupt(TIMER3);
default_interrupt(TIMER4);
default_interrupt(UART2);
default_interrupt(LCD);
default_interrupt(DMA0);
default_interrupt(DMA1);
default_interrupt(DMA2);
default_interrupt(DMA3);
default_interrupt(SDI);
default_interrupt(SPI0);
default_interrupt(UART1);
default_interrupt(NFCON);
default_interrupt(USBD);
default_interrupt(USBH);
default_interrupt(IIC);
default_interrupt(UART0);
default_interrupt(SPI1);
default_interrupt(RTC);
default_interrupt(ADC);
static void (* const irqvector[32])(void) =
{
EINT0, EINT1, EINT2, EINT3,
EINT4_7, EINT8_23, CAM, nBATT_FLT, TICK, WDT_AC97,
TIMER0, TIMER1, TIMER2, TIMER3, TIMER4, UART2,
LCD, DMA0, DMA1, DMA2, DMA3, SDI,
SPI0, UART1, NFCON, USBD, IIC,
UART0, SPI1, RTC, ADC,
};
static const char * const irqname[32] =
{
"EINT0", "EINT1", "EINT2", "EINT3",
"EINT4_7", "EINT8_23", "CAM", "nBATT_FLT", "TICK", "WDT_AC97",
"TIMER0", "TIMER1", "TIMER2", "TIMER3", "TIMER4", "UART2",
"LCD", "DMA0", "DMA1", "DMA2", "DMA3", "SDI",
"SPI0", "UART1", "NFCON", "USBD", "USBH", "IIC",
"UART0", "SPI1", "RTC", "ADC"
};
static void UIRQ(void)
{
unsigned int offset = INTOFFSET;
panicf("Unhandled IRQ %02X: %s", offset, irqname[offset]);
}
void irq_handler(void) __attribute__((interrupt ("IRQ"), naked));
void irq_handler(void)
{
asm volatile (
"sub lr, lr, #4 \r\n"
"stmfd sp!, {r0-r3, ip, lr} \r\n"
"mov r0, #0x4a000000 \r\n" /* INTOFFSET = 0x4a000014 */
"ldr r0, [r0, #0x14] \r\n"
"ldr r1, =irqvector \r\n"
"ldr r1, [r1, r0, lsl #2] \r\n"
"mov lr, pc \r\n"
"bx r1 \r\n"
"ldmfd sp!, {r0-r3, ip, pc}^ \r\n"
);
}
void system_reboot(void)
{
WTCON = 0;
WTCNT = WTDAT = 1 ;
WTCON = 0x21;
for(;;)
;
}
void system_init(void)
{
/* Disable interrupts and set all to IRQ mode */
INTMSK = -1;
INTMOD = 0;
SRCPND = -1;
INTPND = -1;
INTSUBMSK = -1;
SUBSRCPND = -1;
/* TODO: do something with PRIORITY */
/* Turn off currently-not or never-needed devices */
CLKCON &= ~(
/* Turn off AC97 and Camera */
(1<<19) | (1<<20)
/* Turn off SPI */
| (1 << 18)
/* Turn off IIS */
| (1 << 17)
/* Turn off I2C */
| (1 << 16)
/* Turn off all of the UARTS */
| ( (1<<10) | (1<<11) |(1<<12) )
/* Turn off MMC/SD/SDIO Controller (SDI) */
| (1 << 9)
/* Turn off USB device */
| (1 << 7)
/* Turn off USB host */
| (1 << 6)
/* Turn off NAND flash controller */
| (1 << 4)
);
/* Turn off the USB PLL */
CLKSLOW |= (1 << 7);
}
int system_memory_guard(int newmode)
{
(void)newmode;
return 0;
}
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
void set_cpu_frequency(long frequency)
{
if (frequency == CPUFREQ_MAX)
{
asm volatile("mov r0, #0\n"
"mrc p15, 0, r0, c1, c0, 0\n"
"orr r0, r0, #3<<30\n" /* set to Asynchronous mode*/
"mcr p15, 0, r0, c1, c0, 0" : : : "r0");
FREQ = CPUFREQ_MAX;
}
else
{
asm volatile("mov r0, #0\n"
"mrc p15, 0, r0, c1, c0, 0\n"
"bic r0, r0, #3<<30\n" /* set to FastBus mode*/
"mcr p15, 0, r0, c1, c0, 0" : : : "r0");
FREQ = CPUFREQ_NORMAL;
}
}
#endif
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