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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by James Espinoza
*
* 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 <stdio.h>
#include "system.h"
#include "imx31l.h"
#include "avic-imx31.h"
#include "panic.h"
#include "debug.h"
static const char * avic_int_names[64] =
{
"RESERVED0", "RESERVED1", "RESERVED2", "I2C3",
"I2C2", "MPEG4_ENCODER", "RTIC", "FIR",
"MMC/SDHC2", "MMC/SDHC1", "I2C1", "SSI2",
"SSI1", "CSPI2", "CSPI1", "ATA",
"MBX", "CSPI3", "UART3", "IIM",
"SIM1", "SIM2", "RNGA", "EVTMON",
"KPP", "RTC", "PWN", "EPIT2",
"EPIT1", "GPT", "PWR_FAIL", "CCM_DVFS",
"UART2", "NANDFC", "SDMA", "USB_HOST1",
"USB_HOST2", "USB_OTG", "RESERVED3", "MSHC1",
"MSHC2", "IPU_ERR", "IPU", "RESERVED4",
"RESERVED5", "UART1", "UART4", "UART5",
"ETC_IRQ", "SCC_SCM", "SCC_SMN", "GPIO2",
"GPIO1", "CCM_CLK", "PCMCIA", "WDOG",
"GPIO3", "RESERVED6", "EXT_PWMG", "EXT_TEMP",
"EXT_SENS1", "EXT_SENS2", "EXT_WDOG", "EXT_TV"
};
static void UIE_VECTOR(void)
{
int mode;
long offset;
asm volatile (
"mrs %0, cpsr \n" /* Mask core IRQ/FIQ */
"orr %0, %0, #0xc0 \n"
"msr cpsr_c, %0 \n"
"and %0, %0, #0x1f \n" /* Get mode bits */
: "=&r"(mode)
);
offset = mode == 0x11 ? (long)FIVECSR : ((long)NIVECSR >> 16);
panicf("Unhandled %s %ld: %s",
mode == 0x11 ? "FIQ" : "IRQ", offset,
offset >= 0 ? avic_int_names[offset] : "<Unknown>");
}
/* We use the AVIC */
void __attribute__((naked)) irq_handler(void)
{
panicf("Unhandled IRQ in irq_handler");
}
/* Accoring to section 9.3.5 of the UM, the AVIC doesn't accelerate
* fast interrupts and they must be dispatched */
void __attribute__((naked)) fiq_handler(void)
{
asm volatile (
"mov r10, #0x6c000000 \n" /* load AVIC base address */
"ldr r9, [r10, #0x44] \n" /* read FIVECSR of AVIC */
"add r10, r10, #100 \n" /* move pointer to base of VECTOR table */
"ldr r8, [r10, r9, lsl #2] \n" /* read FIQ vector from VECTOR table */
"bx r8 \n" /* jump to FIQ service routine */
);
}
void avic_init(void)
{
int i;
/* Disable all interrupts and set to unhandled */
avic_disable_int(ALL);
/* Reset AVIC control */
INTCNTL = 0;
/* Init all interrupts to type IRQ */
avic_set_int_type(ALL, IRQ);
/* Set all normal to lowest priority */
for (i = 0; i < 8; i++)
NIPRIORITY(i) = 0;
/* Set NM bit to enable VIC */
INTCNTL |= INTCNTL_NM;
/* Enable VE bit in CP15 Control reg to enable VIC */
asm volatile (
"mrc p15, 0, r0, c1, c0, 0 \n"
"orr r0, r0, #(1 << 24) \n"
"mcr p15, 0, r0, c1, c0, 0 \n"
: : : "r0");
/* Enable normal interrupts at all priorities */
NIMASK = 0x1f;
}
void avic_set_int_priority(enum IMX31_INT_LIST ints,
unsigned long ni_priority)
{
volatile unsigned long *reg = &NIPRIORITY((63 - ints) / 8);
unsigned int shift = 4*(ints % 8);
unsigned long mask = 0xful << shift;
*reg = (*reg & ~mask) | ((ni_priority << shift) & mask);
}
void avic_enable_int(enum IMX31_INT_LIST ints, enum INT_TYPE intstype,
unsigned long ni_priority, void (*handler)(void))
{
int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
if (ints != ALL) /* No mass-enable allowed */
{
avic_set_int_type(ints, intstype);
VECTOR(ints) = (long)handler;
INTENNUM = ints;
avic_set_int_priority(ints, ni_priority);
}
restore_interrupt(oldstatus);
}
void avic_disable_int(enum IMX31_INT_LIST ints)
{
long i;
if (ints == ALL)
{
for (i = 0; i < 64; i++)
{
INTDISNUM = i;
VECTOR(i) = (long)UIE_VECTOR;
}
}
else
{
INTDISNUM = ints;
VECTOR(ints) = (long)UIE_VECTOR;
}
}
static void set_int_type(int i, enum INT_TYPE intstype)
{
volatile unsigned long *reg;
long val;
if (i >= 32)
{
reg = &INTTYPEH;
val = 1L << (i - 32);
}
else
{
reg = &INTTYPEL;
val = 1L << i;
}
if (intstype == IRQ)
val = *reg & ~val;
else
val = *reg | val;
*reg = val;
}
void avic_set_int_type(enum IMX31_INT_LIST ints, enum INT_TYPE intstype)
{
int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
if (ints == ALL)
{
int i;
for (i = 0; i < 64; i++)
set_int_type(i, intstype);
}
else
{
set_int_type(ints, intstype);
}
restore_interrupt(oldstatus);
}
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