1 files changed, 100 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/xilinx_irq.c b/arch/powerpc/cpu/ppc4xx/xilinx_irq.c
new file mode 100644
index 0000000..7108777
--- /dev/null
+++ b/arch/powerpc/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;
+}