- 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

7 files changed, 200 insertions, 16 deletions

diff --git a/firmware/src/openpcd.h b/firmware/src/openpcd.h
index 9ad7288..f17b16e 100644
--- a/firmware/src/openpcd.h
+++ b/firmware/src/openpcd.h
@@ -161,6 +161,8 @@
 
 #define OPENPCD_IRQ_PRIO_SPI	AT91C_AIC_PRIOR_HIGHEST
 #define OPENPCD_IRQ_PRIO_SSC	(AT91C_AIC_PRIOR_HIGHEST-1)
+#define OPENPCD_IRQ_PRIO_SYS	(AT91C_AIC_PRIOR_HIGHEST-2)
+#define OPENPCD_IRQ_PRIO_TC_FDT (AT91C_AIC_PRIOR_LOWEST+3)
 #define OPENPCD_IRQ_PRIO_UDP	(AT91C_AIC_PRIOR_LOWEST+2)
 #define OPENPCD_IRQ_PRIO_PIT	(AT91C_AIC_PRIOR_LOWEST+1)
 #define OPENPCD_IRQ_PRIO_RC632	AT91C_AIC_PRIOR_LOWEST
diff --git a/firmware/src/os/dbgu.c b/firmware/src/os/dbgu.c
index 458aa4e..a3a5941 100644
--- a/firmware/src/os/dbgu.c
+++ b/firmware/src/os/dbgu.c
@@ -40,6 +40,7 @@
 #include "../openpcd.h"
 #include <os/led.h>
 #include <os/main.h>
+#include <os/system_irq.h>
 #include <asm/system.h>
 #include <compile.h>
 
@@ -72,10 +73,10 @@ static void Send_reset(void)
 
 //*----------------------------------------------------------------------------
 //* Function Name       : DBGU_irq_handler
-//* Object              : C handler interrupt function called by the interrupts
-//*                       assembling routine
+//* Object              : C handler interrupt function called by the sysirq
+//*                       demultiplexer
 //*----------------------------------------------------------------------------
-static void DBGU_irq_handler(void)
+static void DBGU_irq_handler(u_int32_t sr)
 {
 	static char value;
 
@@ -140,10 +141,7 @@ void AT91F_DBGU_Init(void)
 	AT91F_US_EnableIt((AT91PS_USART) AT91C_BASE_DBGU, AT91C_US_RXRDY);
 
 	//* open interrupt
-	AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SYS, USART_SYS_LEVEL,
-			      AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL,
-			      DBGU_irq_handler);
-	AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_SYS);
+	sysirq_register(AT91SAM7_SYSIRQ_DBGU, &DBGU_irq_handler);
 
 	AT91F_DBGU_Printk("\n\r");
 	AT91F_DBGU_Printk("(C) 2006 by Harald Welte <hwelte@hmw-consulting.de>\n\r"
diff --git a/firmware/src/os/main.c b/firmware/src/os/main.c
index b9ed4dc..f39234b 100644
--- a/firmware/src/os/main.c
+++ b/firmware/src/os/main.c
@@ -41,11 +41,12 @@ int main(void)
 {
 	/* initialize LED and debug unit */
 	led_init();
+	sysirq_init();
 	AT91F_DBGU_Init();
 
 	AT91F_PIOA_CfgPMC();
-
 	wdt_init();
+	pit_init();
 
 	/* initialize USB */
 	req_ctx_init();
diff --git a/firmware/src/os/pit.c b/firmware/src/os/pit.c
index 5c096cc..8bf13ba 100644
--- a/firmware/src/os/pit.c
+++ b/firmware/src/os/pit.c
@@ -26,6 +26,7 @@
 #include <lib_AT91SAM7.h>
 #include <AT91SAM7.h>
 #include <os/pit.h>
+#include <os/system_irq.h>
 
 #include "../openpcd.h"
 
@@ -95,12 +96,12 @@ void timer_add(struct timer_list *tl)
 	local_irq_restore(flags);
 }
 
-static void pit_irq(void)
+static void pit_irq(u_int32_t sr)
 {
 	struct timer_list *tl;
 	unsigned long flags;
 
-	jiffies++;
+	jiffies += *AT91C_PITC_PIVR;
 
 	/* this is the most simple/stupid algorithm one can come up with, but
 	 * hey, we're on a small embedded platform with only a hand ful
@@ -131,10 +132,7 @@ void pit_init(void)
 
 	AT91F_PITInit(AT91C_BASE_PITC, 1000 /* uS */, 48 /* MHz */);
 
-	AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SYS,
-			      OPENPCD_IRQ_PRIO_PIT,
-			      AT91C_AIC_SRCTYPE_INT_POSITIVE_EDGE,
-			      &pit_irq);
+	sysirq_register(AT91SAM7_SYSIRQ_PIT, &pit_irq);	
 
-	//AT91F_PITEnableInt(AT91C_BASE_PITC);
+	AT91F_PITEnableInt(AT91C_BASE_PITC);
 }
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);
+}
diff --git a/firmware/src/os/system_irq.h b/firmware/src/os/system_irq.h
new file mode 100644
index 0000000..195b7b9
--- /dev/null
+++ b/firmware/src/os/system_irq.h
@@ -0,0 +1,22 @@
+#ifndef _SYSTEM_IRQ_H
+#define _SYSTEM_IRQ_H
+
+#include <sys/types.h>
+
+enum sysirqs {
+	AT91SAM7_SYSIRQ_PIT 	= 0,
+	AT91SAM7_SYSIRQ_DBGU	= 1,
+	AT91SAM7_SYSIRQ_EFC	= 2,
+	AT91SAM7_SYSIRQ_WDT	= 3,
+	AT91SAM7_SYSIRQ_RTT	= 4,
+	AT91SAM7_SYSIRQ_RSTC	= 5,
+	AT91SAM7_SYSIRQ_PMC	= 6,
+	AT91SAM7_SYSIRQ_COUNT
+};
+
+typedef void sysirq_hdlr(u_int32_t sr);
+
+extern void sysirq_register(enum sysirqs irq, sysirq_hdlr *hdlr);
+extern void sysirq_init(void);
+
+#endif
diff --git a/firmware/src/os/wdt.c b/firmware/src/os/wdt.c
index 5a3c809..55a0e70 100644
--- a/firmware/src/os/wdt.c
+++ b/firmware/src/os/wdt.c
@@ -21,10 +21,11 @@
 #include <AT91SAM7.h>
 
 #include <os/dbgu.h>
+#include <os/system_irq.h>
 
 #define WDT_DEBUG
  
-static void wdt_irq(void)
+static void wdt_irq(u_int32_t sr)
 {
 	DEBUGPCRF("================> WATCHDOG EXPIRED !!!!!");
 }
@@ -36,6 +37,7 @@ void wdt_restart(void)
 
 void wdt_init(void)
 {
+	sysirq_register(AT91SAM7_SYSIRQ_WDT, &wdt_irq);
 #ifdef WDT_DEBUG
 	AT91F_WDTSetMode(AT91C_BASE_WDTC, (0xfff << 16) |
 			 AT91C_WDTC_WDDBGHLT | AT91C_WDTC_WDIDLEHLT |