ppc4xx: CPU PPC440x5 on Virtex5 FX

-This patchs gives support for the embbedded ppc440
 on the Virtex5 FPGAs
-interrupts.c divided in uic.c and interrupts.c
-xilinx_irq.c for xilinx interrupt controller
-Include modifications propossed by  Stefan Roese

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@uam.es>
Acked-by: Stefan Roese <sr@denx.de>

6 files changed, 361 insertions, 153 deletions

diff --git a/cpu/ppc4xx/Makefile b/cpu/ppc4xx/Makefile
index 800bb41..c773400 100644
--- a/cpu/ppc4xx/Makefile
+++ b/cpu/ppc4xx/Makefile
@@ -35,10 +35,8 @@ SOBJS	+= kgdb.o
 COBJS	:= 40x_spd_sdram.o
 COBJS	+= 44x_spd_ddr.o
 COBJS	+= 44x_spd_ddr2.o
-COBJS	+= 4xx_enet.o
 COBJS	+= 4xx_pci.o
 COBJS	+= 4xx_pcie.o
-COBJS	+= 4xx_uart.o
 COBJS	+= bedbug_405.o
 COBJS	+= commproc.o
 COBJS	+= cpu.o
@@ -47,11 +45,9 @@ COBJS	+= denali_data_eye.o
 COBJS	+= denali_spd_ddr2.o
 COBJS	+= ecc.o
 COBJS	+= fdt.o
-COBJS	+= gpio.o
 COBJS	+= i2c.o
 COBJS	+= interrupts.o
 COBJS	+= iop480_uart.o
-COBJS	+= miiphy.o
 COBJS	+= ndfc.o
 COBJS	+= sdram.o
 COBJS	+= speed.o
@@ -60,6 +56,15 @@ COBJS	+= traps.o
 COBJS	+= usb.o
 COBJS	+= usb_ohci.o
 COBJS	+= usbdev.o
+ifndef CONFIG_XILINX_440
+COBJS	+= 4xx_enet.o
+COBJS	+= 4xx_uart.o
+COBJS	+= gpio.o
+COBJS	+= miiphy.o
+COBJS	+= uic.o
+else
+COBJS	+= xilinx_irq.o
+endif
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
diff --git a/cpu/ppc4xx/cpu.c b/cpu/ppc4xx/cpu.c
index ef32bc6..bc9335a 100644
--- a/cpu/ppc4xx/cpu.c
+++ b/cpu/ppc4xx/cpu.c
@@ -279,7 +279,11 @@ int checkcpu (void)
 
 	get_sys_info(&sys_info);
 
+#if defined(CONFIG_XILINX_440)
+	puts("IBM PowerPC 4");
+#else
 	puts("AMCC PowerPC 4");
+#endif
 
 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
     defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
@@ -542,6 +546,10 @@ int checkcpu (void)
 		strcpy(addstr, "No Security support");
 		break;
 
+	case PVR_VIRTEX5:
+		puts("x5 VIRTEX5");
+		break;
+
 	default:
 		printf (" UNKNOWN (PVR=%08x)", pvr);
 		break;
diff --git a/cpu/ppc4xx/interrupts.c b/cpu/ppc4xx/interrupts.c
index 8215dc6..58d1d81 100644
--- a/cpu/ppc4xx/interrupts.c
+++ b/cpu/ppc4xx/interrupts.c
@@ -8,6 +8,10 @@
  * (C) Copyright 2003 (440GX port)
  * Travis B. Sawyer, Sandburst Corporation, tsawyer@sandburst.com
  *
+ * (C) Copyright 2008 (PPC440X05 port for Virtex 5 FX)
+ * Ricardo Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
+ * Work supported by Qtechnology (htpp://qtec.com)
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -31,23 +35,11 @@
 #include <watchdog.h>
 #include <command.h>
 #include <asm/processor.h>
+#include <asm/interrupt.h>
 #include <ppc4xx.h>
 #include <ppc_asm.tmpl>
 #include <commproc.h>
 
-#if (UIC_MAX > 3)
-#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI) | \
-			 UIC_MASK(VECNUM_UIC2CI) | UIC_MASK(VECNUM_UIC2NCI) | \
-			 UIC_MASK(VECNUM_UIC3CI) | UIC_MASK(VECNUM_UIC3NCI))
-#elif (UIC_MAX > 2)
-#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI) | \
-			 UIC_MASK(VECNUM_UIC2CI) | UIC_MASK(VECNUM_UIC2NCI))
-#elif (UIC_MAX > 1)
-#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI))
-#else
-#define UICB0_ALL	0
-#endif
-
 DECLARE_GLOBAL_DATA_PTR;
 
 /*
@@ -58,11 +50,7 @@ struct	irq_action {
 	void *arg;
 	int count;
 };
-
-static struct irq_action irq_vecs[UIC_MAX * 32];
-
-u32 get_dcr(u16);
-void set_dcr(u16, u32);
+static struct irq_action irq_vecs[IRQ_MAX];
 
 #if defined(CONFIG_440)
 
@@ -103,7 +91,7 @@ int interrupt_init_cpu (unsigned *decrementer_count)
 	/*
 	 * Mark all irqs as free
 	 */
-	for (vec = 0; vec < (UIC_MAX * 32); vec++) {
+	for (vec = 0; vec < IRQ_MAX; vec++) {
 		irq_vecs[vec].handler = NULL;
 		irq_vecs[vec].arg = NULL;
 		irq_vecs[vec].count = 0;
@@ -147,110 +135,36 @@ int interrupt_init_cpu (unsigned *decrementer_count)
 	 */
 	set_evpr(0x00000000);
 
-#if (UIC_MAX > 1)
-	/* Install the UIC1 handlers */
-	irq_install_handler(VECNUM_UIC1NCI, (void *)(void *)external_interrupt, 0);
-	irq_install_handler(VECNUM_UIC1CI, (void *)(void *)external_interrupt, 0);
-#endif
-#if (UIC_MAX > 2)
-	irq_install_handler(VECNUM_UIC2NCI, (void *)(void *)external_interrupt, 0);
-	irq_install_handler(VECNUM_UIC2CI, (void *)(void *)external_interrupt, 0);
-#endif
-#if (UIC_MAX > 3)
-	irq_install_handler(VECNUM_UIC3NCI, (void *)(void *)external_interrupt, 0);
-	irq_install_handler(VECNUM_UIC3CI, (void *)(void *)external_interrupt, 0);
-#endif
+	/*
+	 *Call uic or xilinx_irq pic_enable
+	 */
+	pic_enable();
 
 	return (0);
 }
 
-/* Handler for UIC interrupt */
-static void uic_interrupt(u32 uic_base, int vec_base)
+void timer_interrupt_cpu(struct pt_regs *regs)
 {
-	u32 uic_msr;
-	u32 msr_shift;
-	int vec;
-
-	/*
-	 * Read masked interrupt status register to determine interrupt source
-	 */
-	uic_msr = get_dcr(uic_base + UIC_MSR);
-	msr_shift = uic_msr;
-	vec = vec_base;
-
-	while (msr_shift != 0) {
-		if (msr_shift & 0x80000000) {
-			/*
-			 * Increment irq counter (for debug purpose only)
-			 */
-			irq_vecs[vec].count++;
-
-			if (irq_vecs[vec].handler != NULL) {
-				/* call isr */
-				(*irq_vecs[vec].handler)(irq_vecs[vec].arg);
-			} else {
-				set_dcr(uic_base + UIC_ER,
-					get_dcr(uic_base + UIC_ER) & ~UIC_MASK(vec));
-				printf("Masking bogus interrupt vector %d"
-				       " (UIC_BASE=0x%x)\n", vec, uic_base);
-			}
-
-			/*
-			 * After servicing the interrupt, we have to remove the
-			 * status indicator
-			 */
-			set_dcr(uic_base + UIC_SR, UIC_MASK(vec));
-		}
-
-		/*
-		 * Shift msr to next position and increment vector
-		 */
-		msr_shift <<= 1;
-		vec++;
-	}
+	/* nothing to do here */
+	return;
 }
 
-/*
- * Handle external interrupts
- */
-void external_interrupt(struct pt_regs *regs)
+void interrupt_run_handler(int vec)
 {
-	u32 uic_msr;
-
-	/*
-	 * Read masked interrupt status register to determine interrupt source
-	 */
-	uic_msr = mfdcr(uic0msr);
-
-#if (UIC_MAX > 1)
-	if ((UIC_MASK(VECNUM_UIC1CI) & uic_msr) ||
-	    (UIC_MASK(VECNUM_UIC1NCI) & uic_msr))
-		uic_interrupt(UIC1_DCR_BASE, 32);
-#endif
-
-#if (UIC_MAX > 2)
-	if ((UIC_MASK(VECNUM_UIC2CI) & uic_msr) ||
-	    (UIC_MASK(VECNUM_UIC2NCI) & uic_msr))
-		uic_interrupt(UIC2_DCR_BASE, 64);
-#endif
-
-#if (UIC_MAX > 3)
-	if ((UIC_MASK(VECNUM_UIC3CI) & uic_msr) ||
-	    (UIC_MASK(VECNUM_UIC3NCI) & uic_msr))
-		uic_interrupt(UIC3_DCR_BASE, 96);
-#endif
-
-	if (uic_msr & ~(UICB0_ALL))
-		uic_interrupt(UIC0_DCR_BASE, 0);
-
-	mtdcr(uic0sr, uic_msr);
+	irq_vecs[vec].count++;
+
+	if (irq_vecs[vec].handler != NULL) {
+		/* call isr */
+		(*irq_vecs[vec].handler) (irq_vecs[vec].arg);
+	} else {
+		pic_irq_disable(vec);
+		printf("Masking bogus interrupt vector %d\n", vec);
+	}
 
+	pic_irq_ack(vec);
 	return;
 }
 
-/*
- * Install and free a interrupt handler.
- */
 void irq_install_handler(int vec, interrupt_handler_t * handler, void *arg)
 {
 	/*
@@ -263,51 +177,19 @@ void irq_install_handler(int vec, interrupt_handler_t * handler, void *arg)
 	irq_vecs[vec].handler = handler;
 	irq_vecs[vec].arg = arg;
 
-	if ((vec >= 0) && (vec < 32))
-		mtdcr(uicer, mfdcr(uicer) | UIC_MASK(vec));
-#if (UIC_MAX > 1)
-	else if ((vec >= 32) && (vec < 64))
-		mtdcr(uic1er, mfdcr(uic1er) | UIC_MASK(vec));
-#endif
-#if (UIC_MAX > 2)
-	else if ((vec >= 64) && (vec < 96))
-		mtdcr(uic2er, mfdcr(uic2er) | UIC_MASK(vec));
-#endif
-#if (UIC_MAX > 3)
-	else if (vec >= 96)
-		mtdcr(uic3er, mfdcr(uic3er) | UIC_MASK(vec));
-#endif
-
-	debug("Install interrupt for vector %d ==> %p\n", vec, handler);
+	pic_irq_enable(vec);
+	return;
 }
 
-void irq_free_handler (int vec)
+void irq_free_handler(int vec)
 {
 	debug("Free interrupt for vector %d ==> %p\n",
 	      vec, irq_vecs[vec].handler);
 
-	if ((vec >= 0) && (vec < 32))
-		mtdcr(uicer, mfdcr(uicer) & ~UIC_MASK(vec));
-#if (UIC_MAX > 1)
-	else if ((vec >= 32) && (vec < 64))
-		mtdcr(uic1er, mfdcr(uic1er) & ~UIC_MASK(vec));
-#endif
-#if (UIC_MAX > 2)
-	else if ((vec >= 64) && (vec < 96))
-		mtdcr(uic2er, mfdcr(uic2er) & ~UIC_MASK(vec));
-#endif
-#if (UIC_MAX > 3)
-	else if (vec >= 96)
-		mtdcr(uic3er, mfdcr(uic3er) & ~UIC_MASK(vec));
-#endif
+	pic_irq_disable(vec);
 
 	irq_vecs[vec].handler = NULL;
 	irq_vecs[vec].arg = NULL;
-}
-
-void timer_interrupt_cpu (struct pt_regs *regs)
-{
-	/* nothing to do here */
 	return;
 }
 
@@ -319,7 +201,7 @@ int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	printf ("Interrupt-Information:\n");
 	printf ("Nr  Routine   Arg       Count\n");
 
-	for (vec = 0; vec < (UIC_MAX * 32); vec++) {
+	for (vec = 0; vec < IRQ_MAX; vec++) {
 		if (irq_vecs[vec].handler != NULL) {
 			printf ("%02d  %08lx  %08lx  %d\n",
 				vec,
diff --git a/cpu/ppc4xx/speed.c b/cpu/ppc4xx/speed.c
index b86b6de..d21bd82 100644
--- a/cpu/ppc4xx/speed.c
+++ b/cpu/ppc4xx/speed.c
@@ -416,7 +416,8 @@ ulong get_PCI_freq (void)
 	return sys_info.freqPCI;
 }
 
-#elif !defined(CONFIG_440GX) && !defined(CONFIG_440SP) && !defined(CONFIG_440SPE)
+#elif !defined(CONFIG_440GX) && !defined(CONFIG_440SP) && !defined(CONFIG_440SPE) \
+	&& !defined(CONFIG_XILINX_440)
 void get_sys_info (sys_info_t * sysInfo)
 {
 	unsigned long strp0;
@@ -449,6 +450,8 @@ void get_sys_info (sys_info_t * sysInfo)
 	sysInfo->freqUART = sysInfo->freqPLB;
 }
 #else
+
+#if !defined(CONFIG_XILINX_440)
 void get_sys_info (sys_info_t * sysInfo)
 {
 	unsigned long strp0;
@@ -535,6 +538,7 @@ void get_sys_info (sys_info_t * sysInfo)
 }
 
 #endif
+#endif /* CONFIG_XILINX_440 */
 
 #if defined(CONFIG_YUCCA)
 unsigned long determine_sysper(void)
diff --git a/cpu/ppc4xx/uic.c b/cpu/ppc4xx/uic.c
new file mode 100644
index 0000000..fbf0c2b
--- /dev/null
+++ b/cpu/ppc4xx/uic.c
@@ -0,0 +1,209 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002 (440 port)
+ * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
+ *
+ * (C) Copyright 2003 (440GX port)
+ * Travis B. Sawyer, Sandburst Corporation, tsawyer@sandburst.com
+ *
+ * (C) Copyright 2008 (PPC440X05 port for Virtex 5 FX)
+ * Ricardo Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
+ * Work supported by Qtechnology (htpp://qtec.com)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <asm/interrupt.h>
+#include <ppc4xx.h>
+#include <ppc_asm.tmpl>
+#include <commproc.h>
+
+#if (UIC_MAX > 3)
+#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI) | \
+			 UIC_MASK(VECNUM_UIC2CI) | UIC_MASK(VECNUM_UIC2NCI) | \
+			 UIC_MASK(VECNUM_UIC3CI) | UIC_MASK(VECNUM_UIC3NCI))
+#elif (UIC_MAX > 2)
+#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI) | \
+			 UIC_MASK(VECNUM_UIC2CI) | UIC_MASK(VECNUM_UIC2NCI))
+#elif (UIC_MAX > 1)
+#define UICB0_ALL	(UIC_MASK(VECNUM_UIC1CI) | UIC_MASK(VECNUM_UIC1NCI))
+#else
+#define UICB0_ALL	0
+#endif
+
+u32 get_dcr(u16);
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void pic_enable(void)
+{
+
+#if (UIC_MAX > 1)
+	/* Install the UIC1 handlers */
+	irq_install_handler(VECNUM_UIC1NCI, (void *)(void *)external_interrupt,
+			    0);
+	irq_install_handler(VECNUM_UIC1CI, (void *)(void *)external_interrupt,
+			    0);
+#endif
+#if (UIC_MAX > 2)
+	irq_install_handler(VECNUM_UIC2NCI, (void *)(void *)external_interrupt,
+			    0);
+	irq_install_handler(VECNUM_UIC2CI, (void *)(void *)external_interrupt,
+			    0);
+#endif
+#if (UIC_MAX > 3)
+	irq_install_handler(VECNUM_UIC3NCI, (void *)(void *)external_interrupt,
+			    0);
+	irq_install_handler(VECNUM_UIC3CI, (void *)(void *)external_interrupt,
+			    0);
+#endif
+
+}
+
+/* Handler for UIC interrupt */
+static void uic_interrupt(u32 uic_base, int vec_base)
+{
+	u32 uic_msr;
+	u32 msr_shift;
+	int vec;
+
+	/*
+	 * Read masked interrupt status register to determine interrupt source
+	 */
+	uic_msr = get_dcr(uic_base + UIC_MSR);
+	msr_shift = uic_msr;
+	vec = vec_base;
+
+	while (msr_shift != 0) {
+		if (msr_shift & 0x80000000)
+			interrupt_run_handler(vec);
+		/*
+		 * Shift msr to next position and increment vector
+		 */
+		msr_shift <<= 1;
+		vec++;
+	}
+}
+
+/*
+ * Handle external interrupts
+ */
+void external_interrupt(struct pt_regs *regs)
+{
+	u32 uic_msr;
+
+	/*
+	 * Read masked interrupt status register to determine interrupt source
+	 */
+	uic_msr = mfdcr(uic0msr);
+
+#if (UIC_MAX > 1)
+	if ((UIC_MASK(VECNUM_UIC1CI) & uic_msr) ||
+	    (UIC_MASK(VECNUM_UIC1NCI) & uic_msr))
+		uic_interrupt(UIC1_DCR_BASE, 32);
+#endif
+
+#if (UIC_MAX > 2)
+	if ((UIC_MASK(VECNUM_UIC2CI) & uic_msr) ||
+	    (UIC_MASK(VECNUM_UIC2NCI) & uic_msr))
+		uic_interrupt(UIC2_DCR_BASE, 64);
+#endif
+
+#if (UIC_MAX > 3)
+	if ((UIC_MASK(VECNUM_UIC3CI) & uic_msr) ||
+	    (UIC_MASK(VECNUM_UIC3NCI) & uic_msr))
+		uic_interrupt(UIC3_DCR_BASE, 96);
+#endif
+
+	if (uic_msr & ~(UICB0_ALL))
+		uic_interrupt(UIC0_DCR_BASE, 0);
+
+	mtdcr(uic0sr, uic_msr);
+
+	return;
+}
+
+void pic_irq_ack(unsigned int vec)
+{
+
+	if ((vec >= 0) && (vec < 32))
+		mtdcr(uicsr, UIC_MASK(vec));
+#if (UIC_MAX > 1)
+	else if ((vec >= 32) && (vec < 64))
+		mtdcr(uic1sr, UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 2)
+	else if ((vec >= 64) && (vec < 96))
+		mtdcr(uic2sr, UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 3)
+	else if (vec >= 96)
+		mtdcr(uic3sr, UIC_MASK(vec));
+#endif
+}
+
+/*
+ * Install and free a interrupt handler.
+ */
+void pic_irq_enable(unsigned int vec)
+{
+
+	if ((vec >= 0) && (vec < 32))
+		mtdcr(uicer, mfdcr(uicer) | UIC_MASK(vec));
+#if (UIC_MAX > 1)
+	else if ((vec >= 32) && (vec < 64))
+		mtdcr(uic1er, mfdcr(uic1er) | UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 2)
+	else if ((vec >= 64) && (vec < 96))
+		mtdcr(uic2er, mfdcr(uic2er) | UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 3)
+	else if (vec >= 96)
+		mtdcr(uic3er, mfdcr(uic3er) | UIC_MASK(vec));
+#endif
+
+	debug("Install interrupt for vector %d ==> %p\n", vec, handler);
+}
+
+void pic_irq_disable(unsigned int vec)
+{
+
+	if ((vec >= 0) && (vec < 32))
+		mtdcr(uicer, mfdcr(uicer) & ~UIC_MASK(vec));
+#if (UIC_MAX > 1)
+	else if ((vec >= 32) && (vec < 64))
+		mtdcr(uic1er, mfdcr(uic1er) & ~UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 2)
+	else if ((vec >= 64) && (vec < 96))
+		mtdcr(uic2er, mfdcr(uic2er) & ~UIC_MASK(vec));
+#endif
+#if (UIC_MAX > 3)
+	else if (vec >= 96)
+		mtdcr(uic3er, mfdcr(uic3er) & ~UIC_MASK(vec));
+#endif
+
+}
diff --git a/cpu/ppc4xx/xilinx_irq.c b/cpu/ppc4xx/xilinx_irq.c
new file mode 100644
index 0000000..7108777
--- /dev/null
+++ b/cpu/ppc4xx/xilinx_irq.c
@@ -0,0 +1,100 @@
+/*
+ * (C) Copyright 2008
+ * Ricado Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
+ * This work has been supported by: QTechnology  http://qtec.com/
+ * Based on interrupts.c Wolfgang Denk-DENX Software Engineering-wd@denx.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, see <http://www.gnu.org/licenses/>.
+*/
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <asm/interrupt.h>
+#include <ppc4xx.h>
+#include <ppc_asm.tmpl>
+#include <commproc.h>
+#include <asm/io.h>
+#include <asm/xilinx_irq.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void pic_enable(void)
+{
+	debug("Xilinx PIC at 0x%8x\n", intc);
+
+	/*
+	 * Disable all external interrupts until they are
+	 * explicitly requested.
+	 */
+	out_be32((u32 *) IER, 0);
+
+	/* Acknowledge any pending interrupts just in case. */
+	out_be32((u32 *) IAR, 0xffffffff);
+
+	/* Turn on the Master Enable. */
+	out_be32((u32 *) MER, 0x3UL);
+
+	return;
+}
+
+int xilinx_pic_irq_get(void)
+{
+	u32 irq;
+	irq = in_be32((u32 *) IVR);
+
+	/* If no interrupt is pending then all bits of the IVR are set to 1. As
+	 * the IVR is as many bits wide as numbers of inputs are available.
+	 * Therefore, if all bits of the IVR are set to one, its content will
+	 * be bigger than XPAR_INTC_MAX_NUM_INTR_INPUTS.
+	 */
+	if (irq >= XPAR_INTC_MAX_NUM_INTR_INPUTS)
+		irq = -1;	/* report no pending interrupt. */
+
+	debug("get_irq: %d\n", irq);
+	return (irq);
+}
+
+void pic_irq_enable(unsigned int irq)
+{
+	u32 mask = IRQ_MASK(irq);
+	debug("enable: %d\n", irq);
+	out_be32((u32 *) SIE, mask);
+}
+
+void pic_irq_disable(unsigned int irq)
+{
+	u32 mask = IRQ_MASK(irq);
+	debug("disable: %d\n", irq);
+	out_be32((u32 *) CIE, mask);
+}
+
+void pic_irq_ack(unsigned int irq)
+{
+	u32 mask = IRQ_MASK(irq);
+	debug("ack: %d\n", irq);
+	out_be32((u32 *) IAR, mask);
+}
+
+void external_interrupt(struct pt_regs *regs)
+{
+	int irq;
+
+	irq = xilinx_pic_irq_get();
+	if (irq < 0)
+		return;
+
+	interrupt_run_handler(irq);
+
+	return;
+}