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/* SAM7S system interrupt demultiplexer
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#undef DEBUG
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#include <sys/types.h>
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#include <lib_AT91SAM7.h>
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#include <AT91SAM7.h>
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#include <os/system_irq.h>
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#include <os/dbgu.h>
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#include <string.h>
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#include "../openpcd.h"
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static sysirq_hdlr *sysirq_hdlrs[AT91SAM7_SYSIRQ_COUNT];
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void sys_irq(uint32_t previous_pc)
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{
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uint32_t sr;
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/* Somehow Atmel decided to do really stupid interrupt sharing
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* for commonly-used interrupts such as the timer irq */
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/* dbgu */
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if (*AT91C_DBGU_IMR) {
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sr = *AT91C_DBGU_CSR;
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if (sr & *AT91C_DBGU_IMR) {
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DEBUGP("DBGU(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_DBGU]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_DBGU](sr);
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} else {
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*AT91C_DBGU_IDR = *AT91C_DBGU_IMR;
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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/* pit_irq */
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if (*AT91C_PITC_PIMR & AT91C_PITC_PITIEN) {
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sr = *AT91C_PITC_PISR;
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if (sr & AT91C_PITC_PITS) {
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT]) {
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sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT](sr);
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} else {
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DEBUGP("no handler DISABLE_PIT ");
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*AT91C_PITC_PIMR &= ~AT91C_PITC_PITIEN;
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}
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}
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}
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/* rtt_irq */
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if (*AT91C_RTTC_RTMR & (AT91C_RTTC_ALMIEN|AT91C_RTTC_RTTINCIEN)) {
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sr = *AT91C_RTTC_RTSR;
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if (sr) {
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DEBUGP("RTT(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT](sr);
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} else {
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*AT91C_RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN|
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AT91C_RTTC_RTTINCIEN);
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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/* pmc_irq */
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if (*AT91C_PMC_IMR) {
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sr = *AT91C_PMC_SR;
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if (sr & *AT91C_PMC_IMR) {
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DEBUGP("PMC(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC](sr);
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} else {
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*AT91C_PMC_IDR = *AT91C_PMC_IMR;
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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/* rstc_irq */
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if (*AT91C_RSTC_RMR & (AT91C_RSTC_URSTIEN|AT91C_RSTC_BODIEN)) {
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sr = *AT91C_RSTC_RSR;
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if (sr & (AT91C_RSTC_URSTS|AT91C_RSTC_BODSTS)) {
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DEBUGP("RSTC(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC](sr);
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} else {
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*AT91C_RSTC_RMR &= ~(AT91C_RSTC_URSTIEN|
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AT91C_RSTC_BODIEN);
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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/* mc_irq */
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if (*AT91C_MC_FMR & (AT91C_MC_LOCKE | AT91C_MC_PROGE)) {
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sr = *AT91C_MC_FSR;
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if ((*AT91C_MC_FMR & AT91C_MC_LOCKE && (sr & AT91C_MC_LOCKE))||
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(*AT91C_MC_FMR & AT91C_MC_PROGE && (sr & AT91C_MC_PROGE))){
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DEBUGP("EFC(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC](sr);
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} else {
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*AT91C_MC_FMR &= ~(AT91C_MC_LOCKE |
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AT91C_MC_PROGE);
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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/* wdt_irq */
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if (*AT91C_WDTC_WDMR & AT91C_WDTC_WDFIEN) {
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sr = *AT91C_WDTC_WDSR;
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if (sr) {
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char dbg_buf[100];
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sprintf(dbg_buf, "sys_irq [Old PC = %08X]\n\r", previous_pc);
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AT91F_DBGU_Frame(dbg_buf);
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DEBUGP("WDT(");
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if (sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT]) {
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DEBUGP("handler ");
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sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT](sr);
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} else {
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/* we can't disable it... */
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DEBUGP("no handler ");
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}
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DEBUGP(") ");
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}
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}
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AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_SYS);
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DEBUGPCR("END");
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}
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static void sysirq_entry(void)
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{
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/* DON'T MODIFY THIS SECTION AND Cstartup.S/IRQ_Handler_Entry */
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register unsigned *previous_pc asm("r0");
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asm("ADD R1, SP, #16; LDR R0, [R1]");
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sys_irq(previous_pc);
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}
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void sysirq_register(enum sysirqs irq, sysirq_hdlr *hdlr)
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{
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if (irq >= AT91SAM7_SYSIRQ_COUNT)
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return;
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sysirq_hdlrs[irq] = hdlr;
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}
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void sysirq_init(void)
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{
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AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SYS,
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OPENPCD_IRQ_PRIO_SYS,
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AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
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&sysirq_entry);
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AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_SYS);
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}
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