* Patch by Scott McNutt, 04 Oct 2003:

  - add support for Altera Nios-32 CPU
  - add support for Nios Cyclone Development Kit (DK-1C20)

* Patch by Steven Scholz, 29 Sep 2003:
  - A second parameter for bootm overwrites the load address for
    "Standalone Application" images.
  - bootm sets environment variable "filesize" to the resulting
    (uncompressed) data length for "Standalone Application" images
    when autostart is set to "no". Now you can do something like
       if bootm $fpgadata $some_free_ram ; then
               fpga load 0 $some_free_ram $filesize
       fi

* Patch by Denis Peter, 25 Sept 2003:
  add support for the MIP405 Rev. C board

1 files changed, 184 insertions, 0 deletions

diff --git a/cpu/nios/interrupts.c b/cpu/nios/interrupts.c
new file mode 100644
index 0000000..981b8f7
--- /dev/null
+++ b/cpu/nios/interrupts.c
@@ -0,0 +1,184 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.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 <nios.h>
+#include <nios-io.h>
+#include <asm/ptrace.h>
+#include <common.h>
+#include <command.h>
+
+/****************************************************************************/
+
+struct	irq_action {
+	interrupt_handler_t *handler;
+	void *arg;
+	int count;
+};
+
+static struct irq_action irq_vecs[64];
+
+/*************************************************************************/
+volatile ulong timestamp = 0;
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+
+/* The board must handle this interrupt if a timer is not
+ * provided.
+ */
+#if defined(CFG_NIOS_TMRBASE)
+void timer_interrupt (struct pt_regs *regs)
+{
+	/* Interrupt is cleared by writing anything to the
+	 * status register.
+	 */
+	nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
+	tmr->status = 0;
+	timestamp += CFG_NIOS_TMRMS;
+}
+#endif
+
+/*************************************************************************/
+int disable_interrupts (void)
+{
+	int val = 0;
+
+	/* Writing anything to CLR_IE disables interrupts */
+	val = rdctl (CTL_STATUS);
+	wrctl (CTL_CLR_IE, 0);
+	return (val & STATUS_IE);
+}
+
+void enable_interrupts( void )
+{
+	/* Writing anything SET_IE enables interrupts */
+	wrctl (CTL_SET_IE, 0);
+}
+
+void external_interrupt (struct pt_regs *regs)
+{
+	unsigned vec;
+
+	vec = (regs->status & STATUS_IPRI) >> 9;	/* ipri */
+
+	irq_vecs[vec].count++;
+	if (irq_vecs[vec].handler != NULL) {
+		(*irq_vecs[vec].handler)(irq_vecs[vec].arg);
+	} else {
+		/* A sad side-effect of masking a bogus interrupt is
+		 * that lower priority interrupts will also be disabled.
+		 * This is probably not what we want ... so hang insted.
+		 */
+		printf ("Unhandled interrupt: 0x%x\n", vec);
+		disable_interrupts ();
+		hang ();
+	}
+}
+
+/*************************************************************************/
+int interrupt_init (void)
+{
+	int vec;
+
+#if defined(CFG_NIOS_TMRBASE)
+	nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
+
+	tmr->control &= ~NIOS_TIMER_ITO;
+	tmr->control |= NIOS_TIMER_STOP;
+#endif
+
+	for (vec=0; vec<64; vec++ ) {
+		irq_vecs[vec].handler = NULL;
+		irq_vecs[vec].arg = NULL;
+		irq_vecs[vec].count = 0;
+	}
+
+	/* Need timus interruptus -- start the lopri timer */
+#if defined(CFG_NIOS_TMRBASE)
+	tmr->control |= ( NIOS_TIMER_ITO |
+			  NIOS_TIMER_CONT |
+			  NIOS_TIMER_START );
+	ipri (CFG_NIOS_TMRIRQ + 1);
+#endif
+	enable_interrupts ();
+	return (0);
+}
+
+void irq_install_handler (int vec, interrupt_handler_t *handler, void *arg)
+{
+	struct irq_action *irqa = irq_vecs;
+	int   i = vec;
+	int flag;
+
+	if (irqa[i].handler != NULL) {
+		printf ("Interrupt vector %d: handler 0x%x "
+			"replacing 0x%x\n",
+			vec, (uint)handler, (uint)irqa[i].handler);
+	}
+
+	flag = disable_interrupts ();
+	irqa[i].handler = handler;
+	irqa[i].arg = arg;
+	if (flag )
+		enable_interrupts ();
+}
+
+/*************************************************************************/
+#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
+int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int vec;
+
+	printf ("\nInterrupt-Information:\n");
+	printf ("Nr  Routine   Arg       CouIt's ok to cnt\n");
+
+	for (vec=0; vec<64; vec++) {
+		if (irq_vecs[vec].handler != NULL) {
+			printf ("%02d  %08lx  %08lx  %d\n",
+				vec,
+				(ulong)irq_vecs[vec].handler<<1,
+				(ulong)irq_vecs[vec].arg,
+				irq_vecs[vec].count);
+		}
+	}
+
+	return (0);
+}
+#endif  /* CONFIG_COMMANDS & CFG_CMD_IRQ */