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/* SAM7S system interrupt demultiplexer
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#undef DEBUG
#include <sys/types.h>
#include <lib_AT91SAM7.h>
#include <AT91SAM7.h>
#include <os/system_irq.h>
#include <os/dbgu.h>
#include <string.h>
#include "../openpcd.h"
static sysirq_hdlr *sysirq_hdlrs[AT91SAM7_SYSIRQ_COUNT];
void sys_irq(uint32_t previous_pc)
{
uint32_t sr;
/* Somehow Atmel decided to do really stupid interrupt sharing
* for commonly-used interrupts such as the timer irq */
/* dbgu */
if (*AT91C_DBGU_IMR) {
sr = *AT91C_DBGU_CSR;
if (sr & *AT91C_DBGU_IMR) {
DEBUGP("DBGU(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_DBGU]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_DBGU](sr);
} else {
*AT91C_DBGU_IDR = *AT91C_DBGU_IMR;
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
/* pit_irq */
if (*AT91C_PITC_PIMR & AT91C_PITC_PITIEN) {
sr = *AT91C_PITC_PISR;
if (sr & AT91C_PITC_PITS) {
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT]) {
sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT](sr);
} else {
DEBUGP("no handler DISABLE_PIT ");
*AT91C_PITC_PIMR &= ~AT91C_PITC_PITIEN;
}
}
}
/* rtt_irq */
if (*AT91C_RTTC_RTMR & (AT91C_RTTC_ALMIEN|AT91C_RTTC_RTTINCIEN)) {
sr = *AT91C_RTTC_RTSR;
if (sr) {
DEBUGP("RTT(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT](sr);
} else {
*AT91C_RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN|
AT91C_RTTC_RTTINCIEN);
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
/* pmc_irq */
if (*AT91C_PMC_IMR) {
sr = *AT91C_PMC_SR;
if (sr & *AT91C_PMC_IMR) {
DEBUGP("PMC(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC](sr);
} else {
*AT91C_PMC_IDR = *AT91C_PMC_IMR;
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
/* rstc_irq */
if (*AT91C_RSTC_RMR & (AT91C_RSTC_URSTIEN|AT91C_RSTC_BODIEN)) {
sr = *AT91C_RSTC_RSR;
if (sr & (AT91C_RSTC_URSTS|AT91C_RSTC_BODSTS)) {
DEBUGP("RSTC(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC](sr);
} else {
*AT91C_RSTC_RMR &= ~(AT91C_RSTC_URSTIEN|
AT91C_RSTC_BODIEN);
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
/* mc_irq */
if (*AT91C_MC_FMR & (AT91C_MC_LOCKE | AT91C_MC_PROGE)) {
sr = *AT91C_MC_FSR;
if ((*AT91C_MC_FMR & AT91C_MC_LOCKE && (sr & AT91C_MC_LOCKE))||
(*AT91C_MC_FMR & AT91C_MC_PROGE && (sr & AT91C_MC_PROGE))){
DEBUGP("EFC(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC](sr);
} else {
*AT91C_MC_FMR &= ~(AT91C_MC_LOCKE |
AT91C_MC_PROGE);
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
/* wdt_irq */
if (*AT91C_WDTC_WDMR & AT91C_WDTC_WDFIEN) {
sr = *AT91C_WDTC_WDSR;
if (sr) {
char dbg_buf[100];
sprintf(dbg_buf, "sys_irq [Old PC = %08X]\n\r", previous_pc);
AT91F_DBGU_Frame(dbg_buf);
DEBUGP("WDT(");
if (sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT]) {
DEBUGP("handler ");
sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT](sr);
} else {
/* we can't disable it... */
DEBUGP("no handler ");
}
DEBUGP(") ");
}
}
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_SYS);
DEBUGPCR("END");
}
static void sysirq_entry(void)
{
/* DON'T MODIFY THIS SECTION AND Cstartup.S/IRQ_Handler_Entry */
register unsigned *previous_pc asm("r0");
asm("ADD R1, SP, #16; LDR R0, [R1]");
sys_irq(previous_pc);
}
void sysirq_register(enum sysirqs irq, sysirq_hdlr *hdlr)
{
if (irq >= AT91SAM7_SYSIRQ_COUNT)
return;
sysirq_hdlrs[irq] = hdlr;
}
void sysirq_init(void)
{
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SYS,
OPENPCD_IRQ_PRIO_SYS,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
&sysirq_entry);
AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_SYS);
}
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