- add proper system interrupt (shared) demultiplexing code

- port debug unit, watchdog timer, periodic interval timer to system_irq.c


git-svn-id: https://svn.openpcd.org:2342/trunk@252 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

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
@@ -0,0 +1,161 @@
+/* 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);
+}