1 files changed, 268 insertions, 0 deletions
diff --git a/board/MAI/AmigaOneG3SE/interrupts.c b/board/MAI/AmigaOneG3SE/interrupts.c
new file mode 100644
index 0000000..bb93ea0
--- /dev/null
+++ b/board/MAI/AmigaOneG3SE/interrupts.c
@@ -0,0 +1,268 @@
+/*
+ * (C) Copyright 2002
+ * John W. Linville <linville@tuxdriver.com>
+ *
+ *    Copied and modified from original code by Josh Huber.  Original
+ *    copyright notice preserved below.
+ *
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * 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
+ */
+
+/*
+ * interrupts.c - just enough support for the decrementer/timer
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <command.h>
+#include "i8259.h"
+
+#undef DEBUG
+#ifdef  DEBUG
+#define PRINTF(fmt,args...)     printf (fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+#define NR_IRQS	16
+
+void irq_alloc_init(void);
+long irq_alloc(long wanted);
+
+/****************************************************************************/
+
+unsigned decrementer_count;	     /* count value for 1e6/HZ microseconds */
+
+struct irq_action {
+    interrupt_handler_t *handler;
+    void *arg;
+    ulong count;
+};
+
+static struct irq_action irq_handlers[NR_IRQS];
+
+/****************************************************************************/
+
+static __inline__ unsigned long
+get_msr(void)
+{
+	unsigned long msr;
+
+	asm volatile("mfmsr %0" : "=r" (msr) :);
+	return msr;
+}
+
+static __inline__ void
+set_msr(unsigned long msr)
+{
+	asm volatile("mtmsr %0" : : "r" (msr)); 
+}
+
+static __inline__ unsigned long
+get_dec(void)
+{
+	unsigned long val;
+
+	asm volatile("mfdec %0" : "=r" (val) :);
+	return val;
+}
+
+
+static __inline__ void
+set_dec(unsigned long val)
+{
+	asm volatile("mtdec %0" : : "r" (val)); 
+}
+
+
+void
+enable_interrupts(void)
+{
+    set_msr (get_msr() | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int
+disable_interrupts(void)
+{
+    ulong msr;
+
+    msr = get_msr();
+    set_msr (msr & ~MSR_EE);
+    return ((msr & MSR_EE) != 0);
+}
+
+/****************************************************************************/
+
+int interrupt_init (void)
+{
+    extern void new_reset(void);
+    extern void new_reset_end(void);
+#ifdef DEBUG
+	puts("interrupt_init: setting decrementer_count\n");
+#endif
+	decrementer_count = get_tbclk() / CFG_HZ;
+
+#ifdef DEBUG
+	puts("interrupt_init: setting actual decremter\n");
+#endif
+	set_dec (get_tbclk() / CFG_HZ);
+
+#ifdef DEBUG
+	puts("interrupt_init: clearing external interrupt table\n");
+#endif
+	/* clear external interrupt table here */
+	memset(irq_handlers, 0, sizeof(irq_handlers));
+
+#ifdef DEBUG
+	puts("interrupt_init: initializing interrupt controller\n");
+#endif
+	i8259_init();
+
+#ifdef DEBUG
+	puts("Copying reset trampoline\n");
+#endif
+	/* WARNING: Assmues that the first megabyte is CACHEINHIBIT! */
+	memcpy((void *)0x100, new_reset, new_reset_end - new_reset);
+
+#ifdef DEBUG
+	PRINTF("interrupt_init: enabling interrupts (msr = %08x)\n",
+		get_msr());
+#endif
+	set_msr (get_msr() | MSR_EE);
+
+#ifdef DEBUG
+	PRINTF("interrupt_init: done. (msr = %08x)\n", get_msr());
+#endif
+
+}
+
+/****************************************************************************/
+
+/*
+ * Handle external interrupts
+ */
+void
+external_interrupt(struct pt_regs *regs)
+{
+    extern int i8259_irq(void);
+
+	int irq, unmask = 1;
+
+	irq = i8259_irq(); //i8259_get_irq(regs);
+//	printf("irq = %d, handler at %p ack=%d\n", irq, irq_handlers[irq].handler, *(volatile unsigned char *)0xFEF00000);
+	i8259_mask_and_ack(irq);
+
+	if (irq_handlers[irq].handler != NULL)
+		(*irq_handlers[irq].handler)(irq_handlers[irq].arg);
+	else {
+		PRINTF ("\nBogus External Interrupt IRQ %d\n", irq);
+		/*
+	 	* turn off the bogus interrupt, otherwise it
+	 	* might repeat forever
+	 	*/
+		unmask = 0;
+	}
+
+	if (unmask) i8259_unmask_irq(irq);
+}
+
+volatile ulong timestamp = 0;
+
+/*
+ * timer_interrupt - gets called when the decrementer overflows,
+ * with interrupts disabled.
+ * Trivial implementation - no need to be really accurate.
+ */
+void
+timer_interrupt(struct pt_regs *regs)
+{
+	set_dec(decrementer_count);
+	timestamp++;
+}
+
+/****************************************************************************/
+
+void
+reset_timer(void)
+{
+	timestamp = 0;
+}
+
+ulong
+get_timer(ulong base)
+{
+	return (timestamp - base);
+}
+
+void
+set_timer(ulong t)
+{
+	timestamp = t;
+}
+
+/****************************************************************************/
+
+/*
+ * Install and free a interrupt handler.
+ */
+
+void
+irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
+{
+	if (irq < 0 || irq >= NR_IRQS) {
+		PRINTF("irq_install_handler: bad irq number %d\n", irq);
+		return;
+	}
+
+	if (irq_handlers[irq].handler != NULL)
+		PRINTF("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
+		       (ulong)handler, (ulong)irq_handlers[irq].handler);
+
+	irq_handlers[irq].handler = handler;
+	irq_handlers[irq].arg     = arg;
+
+	i8259_unmask_irq(irq);
+}
+
+void
+irq_free_handler(int irq)
+{
+	if (irq < 0 || irq >= NR_IRQS) {
+		PRINTF("irq_free_handler: bad irq number %d\n", irq);
+		return;
+	}
+
+	i8259_mask_irq(irq);
+
+	irq_handlers[irq].handler = NULL;
+	irq_handlers[irq].arg     = NULL;
+}
+
+/****************************************************************************/
+
+void
+do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
+{
+	puts("IRQ related functions are unimplemented currently.\n");
+}
+
+