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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Karl Kurbjun
*
* 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 "cpu.h"
#include "mmu-arm.h"
#include "kernel.h"
#include "system.h"
#include "panic.h"
#include "uart-target.h"
#include "system-arm.h"
#include "spi.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(TIMER0);
default_interrupt(TIMER1);
default_interrupt(TIMER2);
default_interrupt(TIMER3);
default_interrupt(CCD_VD0);
default_interrupt(CCD_VD1);
default_interrupt(CCD_WEN);
default_interrupt(VENC);
default_interrupt(SERIAL0);
default_interrupt(SERIAL1);
default_interrupt(EXT_HOST);
default_interrupt(DSPHINT);
default_interrupt(UART0);
default_interrupt(UART1);
default_interrupt(USB_DMA);
default_interrupt(USB_CORE);
default_interrupt(VLYNQ);
default_interrupt(MTC0);
default_interrupt(MTC1);
default_interrupt(SD_MMC);
default_interrupt(SDIO_MS);
default_interrupt(GIO0);
default_interrupt(GIO1);
default_interrupt(GIO2);
default_interrupt(GIO3);
default_interrupt(GIO4);
default_interrupt(GIO5);
default_interrupt(GIO6);
default_interrupt(GIO7);
default_interrupt(GIO8);
default_interrupt(GIO9);
default_interrupt(GIO10);
default_interrupt(GIO11);
default_interrupt(GIO12);
default_interrupt(GIO13);
default_interrupt(GIO14);
default_interrupt(GIO15);
default_interrupt(PREVIEW0);
default_interrupt(PREVIEW1);
default_interrupt(WATCHDOG);
default_interrupt(I2C);
default_interrupt(CLKC);
default_interrupt(ICE);
default_interrupt(ARMCOM_RX);
default_interrupt(ARMCOM_TX);
default_interrupt(RESERVED);
static void (* const irqvector[])(void) =
{
TIMER0,TIMER1,TIMER2,TIMER3,CCD_VD0,CCD_VD1,
CCD_WEN,VENC,SERIAL0,SERIAL1,EXT_HOST,DSPHINT,
UART0,UART1,USB_DMA,USB_CORE,VLYNQ,MTC0,MTC1,
SD_MMC,SDIO_MS,GIO0,GIO1,GIO2,GIO3,GIO4,GIO5,
GIO6,GIO7,GIO8,GIO9,GIO10,GIO11,GIO12,GIO13,
GIO14,GIO15,PREVIEW0,PREVIEW1,WATCHDOG,I2C,CLKC,
ICE,ARMCOM_RX,ARMCOM_TX,RESERVED
};
static const char * const irqname[] =
{
"TIMER0","TIMER1","TIMER2","TIMER3","CCD_VD0","CCD_VD1",
"CCD_WEN","VENC","SERIAL0","SERIAL1","EXT_HOST","DSPHINT",
"UART0","UART1","USB_DMA","USB_CORE","VLYNQ","MTC0","MTC1",
"SD_MMC","SDIO_MS","GIO0","GIO1","GIO2","GIO3","GIO4","GIO5",
"GIO6","GIO7","GIO8","GIO9","GIO10","GIO11","GIO12","GIO13",
"GIO14","GIO15","PREVIEW0","PREVIEW1","WATCHDOG","I2C","CLKC",
"ICE","ARMCOM_RX","ARMCOM_TX","RESERVED"
};
static void UIRQ(void)
{
unsigned int offset = (IO_INTC_IRQENTRY0>>2)-1;
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 */
irqvector[(IO_INTC_IRQENTRY0>>2)-1]();
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 FIQ */
}
void fiq_handler(void)
{
/*
* Based on: linux/arch/arm/kernel/entry-armv.S and system-meg-fx.c
*/
asm volatile (
"sub lr, lr, #4 \r\n"
"stmfd sp!, {r0-r3, ip, lr} \r\n"
"mov r0, #0x00030000 \r\n"
"ldr r0, [r0, #0x518] \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)
{
}
void system_init(void)
{
/* taken from linux/arch/arm/mach-itdm320-20/irq.c */
/* Clearing all FIQs and IRQs. */
IO_INTC_IRQ0 = 0xFFFF;
IO_INTC_IRQ1 = 0xFFFF;
IO_INTC_IRQ2 = 0xFFFF;
IO_INTC_FIQ0 = 0xFFFF;
IO_INTC_FIQ1 = 0xFFFF;
IO_INTC_FIQ2 = 0xFFFF;
/* Masking all Interrupts. */
IO_INTC_EINT0 = 0;
IO_INTC_EINT1 = 0;
IO_INTC_EINT2 = 0;
/* Setting INTC to all IRQs. */
IO_INTC_FISEL0 = 0;
IO_INTC_FISEL1 = 0;
IO_INTC_FISEL2 = 0;
IO_INTC_ENTRY_TBA0 = 0;
IO_INTC_ENTRY_TBA1 = 0;
/* set GIO26 (reset pin) to output and low */
IO_GIO_BITCLR1=(1<<10);
IO_GIO_DIR1&=~(1<<10);
uart_init();
spi_init();
/* MMU initialization (Starts data and instruction cache) */
ttb_init();
/* Make sure everything is mapped on itself */
map_section(0, 0, 0x1000, CACHE_NONE);
/* Enable caching for RAM */
map_section(0x00900000, 0x00900000, 64, CACHE_ALL);
/* enable buffered writing for the framebuffer */
map_section((int)FRAME, (int)FRAME, 1, BUFFERED);
enable_mmu();
}
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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