1 files changed, 144 insertions, 0 deletions
diff --git a/roms/u-boot/arch/nios2/cpu/interrupts.c b/roms/u-boot/arch/nios2/cpu/interrupts.c
new file mode 100644
index 000000000..90cabb675
--- /dev/null
+++ b/roms/u-boot/arch/nios2/cpu/interrupts.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <irq_func.h>
+#include <asm/nios2.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include <asm/ptrace.h>
+
+/*************************************************************************/
+struct	irq_action {
+	interrupt_handler_t *handler;
+	void *arg;
+	int count;
+};
+
+static struct irq_action vecs[32];
+
+int disable_interrupts(void)
+{
+	int val = rdctl (CTL_STATUS);
+	wrctl (CTL_STATUS, val & ~STATUS_IE);
+	return (val & STATUS_IE);
+}
+
+void enable_interrupts( void )
+{
+	int val = rdctl (CTL_STATUS);
+	wrctl (CTL_STATUS, val | STATUS_IE);
+}
+
+void external_interrupt(struct pt_regs *regs)
+{
+	unsigned irqs;
+	struct irq_action *act;
+
+	/* Evaluate only irqs that are both enabled AND pending */
+	irqs = rdctl (CTL_IENABLE) & rdctl (CTL_IPENDING);
+	act = vecs;
+
+	/* Assume (as does the Nios2 HAL) that bit 0 is highest
+	 * priority. NOTE: There is ALWAYS a handler assigned
+	 * (the default if no other).
+	 */
+	while (irqs) {
+		if (irqs & 1) {
+			act->handler (act->arg);
+			act->count++;
+		}
+		irqs >>=1;
+		act++;
+	}
+}
+
+static void def_hdlr (void *arg)
+{
+	unsigned irqs = rdctl (CTL_IENABLE);
+
+	/* Disable the individual interrupt -- with gratuitous
+	 * warning.
+	 */
+	irqs &= ~(1 << (int)arg);
+	wrctl (CTL_IENABLE, irqs);
+	printf ("WARNING: Disabling unhandled interrupt: %d\n",
+			(int)arg);
+}
+
+/*************************************************************************/
+void irq_install_handler(int irq, interrupt_handler_t *hdlr, void *arg)
+{
+
+	int flag;
+	struct irq_action *act;
+	unsigned ena = rdctl (CTL_IENABLE);
+
+	if ((irq < 0) || (irq > 31))
+		return;
+	act = &vecs[irq];
+
+	flag = disable_interrupts();
+	if (hdlr) {
+		act->handler = hdlr;
+		act->arg = arg;
+		ena |= (1 << irq);		/* enable */
+	} else {
+		act->handler = def_hdlr;
+		act->arg = (void *)irq;
+		ena &= ~(1 << irq);		/* disable */
+	}
+	wrctl (CTL_IENABLE, ena);
+	if (flag) enable_interrupts();
+}
+
+
+int interrupt_init(void)
+{
+	int i;
+
+	/* Assign the default handler to all */
+	for (i = 0; i < 32; i++) {
+		vecs[i].handler = def_hdlr;
+		vecs[i].arg = (void *)i;
+		vecs[i].count = 0;
+	}
+
+	enable_interrupts();
+	return (0);
+}
+
+
+/*************************************************************************/
+#if defined(CONFIG_CMD_IRQ)
+int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	int i;
+	struct irq_action *act = vecs;
+
+	printf ("\nInterrupt-Information:\n\n");
+	printf ("Nr  Routine   Arg       Count\n");
+	printf ("-----------------------------\n");
+
+	for (i=0; i<32; i++) {
+		if (act->handler != def_hdlr) {
+			printf ("%02d  %08lx  %08lx  %d\n",
+				i,
+				(ulong)act->handler,
+				(ulong)act->arg,
+				act->count);
+		}
+		act++;
+	}
+	printf ("\n");
+
+	return (0);
+}
+#endif