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Diffstat (limited to 'firmware/src/os/system_irq.c')
-rw-r--r--firmware/src/os/system_irq.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/firmware/src/os/system_irq.c b/firmware/src/os/system_irq.c
new file mode 100644
index 0000000..455791c
--- /dev/null
+++ b/firmware/src/os/system_irq.c
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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 "../openpcd.h"
+
+static sysirq_hdlr *sysirq_hdlrs[AT91SAM7_SYSIRQ_COUNT];
+
+static void sys_irq(void)
+{
+ u_int32_t sr;
+ DEBUGP("sys_irq: ");
+
+ /* 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;
+ DEBUGP("DBGU(");
+ if (sr & *AT91C_DBGU_IMR) {
+ DEBUGP("found ");
+ 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;
+ DEBUGP("PIT(");
+ if (sr & AT91C_PITC_PITS) {
+ DEBUGP("found ");
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT]) {
+ DEBUGP("handler ");
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_PIT](sr);
+ } else {
+ *AT91C_PITC_PIMR &= ~AT91C_PITC_PITIEN;
+ DEBUGP("no handler ");
+ }
+ }
+ DEBUGP(") ");
+ }
+
+ /* rtt_irq */
+ if (*AT91C_RTTC_RTMR & (AT91C_RTTC_ALMIEN|AT91C_RTTC_RTTINCIEN)) {
+ sr = *AT91C_RTTC_RTSR;
+ DEBUGP("RTT(");
+ if (sr) {
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT])
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_RTT](sr);
+ else
+ *AT91C_RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN|
+ AT91C_RTTC_RTTINCIEN);
+ }
+ DEBUGP(") ");
+ }
+
+ /* pmc_irq */
+ if (*AT91C_PMC_IMR) {
+ sr = *AT91C_PMC_SR;
+ DEBUGP("PMC(");
+ if (sr & *AT91C_PMC_IMR) {
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC])
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_PMC](sr);
+ else
+ *AT91C_PMC_IDR = *AT91C_PMC_IMR;
+ }
+ DEBUGP(") ");
+ }
+
+ /* rstc_irq */
+ if (*AT91C_RSTC_RMR & (AT91C_RSTC_URSTIEN|AT91C_RSTC_BODIEN)) {
+ sr = *AT91C_RSTC_RSR;
+ DEBUGP("RSTC(");
+ if (sr & (AT91C_RSTC_URSTS|AT91C_RSTC_BODSTS)) {
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC])
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_RSTC](sr);
+ else
+ *AT91C_RSTC_RMR &= ~(AT91C_RSTC_URSTIEN|
+ AT91C_RSTC_BODIEN);
+ }
+ DEBUGP(") ");
+ }
+
+ /* mc_irq */
+ if (*AT91C_MC_FMR & (AT91C_MC_LOCKE | AT91C_MC_PROGE)) {
+ sr = *AT91C_MC_FSR;
+ DEBUGP("EFC(");
+ if ((*AT91C_MC_FMR & AT91C_MC_LOCKE && (sr & AT91C_MC_LOCKE))||
+ (*AT91C_MC_FMR & AT91C_MC_PROGE && (sr & AT91C_MC_PROGE))){
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC])
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_EFC](sr);
+ else
+ *AT91C_MC_FMR &= ~(AT91C_MC_LOCKE |
+ AT91C_MC_PROGE);
+ }
+ DEBUGP(") ");
+ }
+
+ /* wdt_irq */
+ if (*AT91C_WDTC_WDMR & AT91C_WDTC_WDFIEN) {
+ sr = *AT91C_WDTC_WDSR;
+ DEBUGP("WDT(");
+ if (sr) {
+ if (sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT])
+ sysirq_hdlrs[AT91SAM7_SYSIRQ_WDT](sr);
+ /* we can't disable it... */
+ }
+ DEBUGP(") ");
+ }
+ AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_SYS);
+ DEBUGPCR("");
+}
+
+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_POSITIVE_EDGE,
+ &sys_irq);
+ AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_SYS);
+}
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