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Diffstat (limited to 'arch/mips/ddb5xxx/ddb5477/irq_5477.c')
-rw-r--r--arch/mips/ddb5xxx/ddb5477/irq_5477.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/mips/ddb5xxx/ddb5477/irq_5477.c b/arch/mips/ddb5xxx/ddb5477/irq_5477.c
new file mode 100644
index 000000000000..0d5e706207ec
--- /dev/null
+++ b/arch/mips/ddb5xxx/ddb5477/irq_5477.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ * arch/mips/ddb5xxx/ddb5477/irq_5477.c
+ * This file defines the irq handler for Vrc5477.
+ *
+ * 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.
+ *
+ */
+
+/*
+ * Vrc5477 defines 32 IRQs.
+ *
+ * This file exports one function:
+ * vrc5477_irq_init(u32 irq_base);
+ */
+
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+
+#include <asm/debug.h>
+
+#include <asm/ddb5xxx/ddb5xxx.h>
+
+/* number of total irqs supported by Vrc5477 */
+#define NUM_5477_IRQ 32
+
+static int vrc5477_irq_base = -1;
+
+
+static void
+vrc5477_irq_enable(unsigned int irq)
+{
+ db_assert(vrc5477_irq_base != -1);
+ db_assert(irq >= vrc5477_irq_base);
+ db_assert(irq < vrc5477_irq_base+ NUM_5477_IRQ);
+
+ ll_vrc5477_irq_enable(irq - vrc5477_irq_base);
+}
+
+static void
+vrc5477_irq_disable(unsigned int irq)
+{
+ db_assert(vrc5477_irq_base != -1);
+ db_assert(irq >= vrc5477_irq_base);
+ db_assert(irq < vrc5477_irq_base + NUM_5477_IRQ);
+
+ ll_vrc5477_irq_disable(irq - vrc5477_irq_base);
+}
+
+static unsigned int vrc5477_irq_startup(unsigned int irq)
+{
+ vrc5477_irq_enable(irq);
+ return 0;
+}
+
+#define vrc5477_irq_shutdown vrc5477_irq_disable
+
+static void
+vrc5477_irq_ack(unsigned int irq)
+{
+ db_assert(vrc5477_irq_base != -1);
+ db_assert(irq >= vrc5477_irq_base);
+ db_assert(irq < vrc5477_irq_base+ NUM_5477_IRQ);
+
+ /* clear the interrupt bit */
+ /* some irqs require the driver to clear the sources */
+ ddb_out32(DDB_INTCLR32, 1 << (irq - vrc5477_irq_base));
+
+ /* disable interrupt - some handler will re-enable the irq
+ * and if the interrupt is leveled, we will have infinite loop
+ */
+ ll_vrc5477_irq_disable(irq - vrc5477_irq_base);
+}
+
+static void
+vrc5477_irq_end(unsigned int irq)
+{
+ db_assert(vrc5477_irq_base != -1);
+ db_assert(irq >= vrc5477_irq_base);
+ db_assert(irq < vrc5477_irq_base + NUM_5477_IRQ);
+
+ if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+ ll_vrc5477_irq_enable( irq - vrc5477_irq_base);
+}
+
+hw_irq_controller vrc5477_irq_controller = {
+ "vrc5477_irq",
+ vrc5477_irq_startup,
+ vrc5477_irq_shutdown,
+ vrc5477_irq_enable,
+ vrc5477_irq_disable,
+ vrc5477_irq_ack,
+ vrc5477_irq_end,
+ NULL /* no affinity stuff for UP */
+};
+
+void __init vrc5477_irq_init(u32 irq_base)
+{
+ u32 i;
+
+ for (i= irq_base; i< irq_base+ NUM_5477_IRQ; i++) {
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].handler = &vrc5477_irq_controller;
+ }
+
+ vrc5477_irq_base = irq_base;
+}
+
+void ll_vrc5477_irq_route(int vrc5477_irq, int ip)
+{
+ u32 reg_value;
+ u32 reg_bitmask;
+ u32 reg_index;
+
+ db_assert(vrc5477_irq >= 0);
+ db_assert(vrc5477_irq < NUM_5477_IRQ);
+ db_assert(ip >= 0);
+ db_assert((ip < 5) || (ip == 6));
+
+ reg_index = DDB_INTCTRL0 + vrc5477_irq/8*4;
+ reg_value = ddb_in32(reg_index);
+ reg_bitmask = 7 << (vrc5477_irq % 8 * 4);
+ reg_value &= ~reg_bitmask;
+ reg_value |= ip << (vrc5477_irq % 8 * 4);
+ ddb_out32(reg_index, reg_value);
+}
+
+void ll_vrc5477_irq_enable(int vrc5477_irq)
+{
+ u32 reg_value;
+ u32 reg_bitmask;
+ u32 reg_index;
+
+ db_assert(vrc5477_irq >= 0);
+ db_assert(vrc5477_irq < NUM_5477_IRQ);
+
+ reg_index = DDB_INTCTRL0 + vrc5477_irq/8*4;
+ reg_value = ddb_in32(reg_index);
+ reg_bitmask = 8 << (vrc5477_irq % 8 * 4);
+ db_assert((reg_value & reg_bitmask) == 0);
+ ddb_out32(reg_index, reg_value | reg_bitmask);
+}
+
+void ll_vrc5477_irq_disable(int vrc5477_irq)
+{
+ u32 reg_value;
+ u32 reg_bitmask;
+ u32 reg_index;
+
+ db_assert(vrc5477_irq >= 0);
+ db_assert(vrc5477_irq < NUM_5477_IRQ);
+
+ reg_index = DDB_INTCTRL0 + vrc5477_irq/8*4;
+ reg_value = ddb_in32(reg_index);
+ reg_bitmask = 8 << (vrc5477_irq % 8 * 4);
+
+ /* we assert that the interrupt is enabled (perhaps over-zealous) */
+ db_assert( (reg_value & reg_bitmask) != 0);
+ ddb_out32(reg_index, reg_value & ~reg_bitmask);
+}