1 files changed, 160 insertions, 0 deletions

diff --git a/arch/mips/lasat/interrupt.c b/arch/mips/lasat/interrupt.c
new file mode 100644
index 000000000000..1148a2d20aa7
--- /dev/null
+++ b/arch/mips/lasat/interrupt.c
@@ -0,0 +1,160 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope 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.
+ *
+ * Routines for generic manipulation of the interrupts found on the 
+ * Lasat boards.
+ */
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/bootinfo.h>
+#include <asm/irq.h>
+#include <asm/lasat/lasatint.h>
+#include <asm/gdb-stub.h>
+
+static volatile int *lasat_int_status = NULL;
+static volatile int *lasat_int_mask = NULL;
+static volatile int lasat_int_mask_shift;
+
+extern asmlinkage void lasatIRQ(void);
+
+void disable_lasat_irq(unsigned int irq_nr)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        *lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
+        local_irq_restore(flags);
+}
+
+void enable_lasat_irq(unsigned int irq_nr)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        *lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
+        local_irq_restore(flags);
+}
+
+static unsigned int startup_lasat_irq(unsigned int irq)
+{
+        enable_lasat_irq(irq);
+
+        return 0; /* never anything pending */
+}
+
+#define shutdown_lasat_irq      disable_lasat_irq
+
+#define mask_and_ack_lasat_irq disable_lasat_irq
+
+static void end_lasat_irq(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+                enable_lasat_irq(irq);
+}
+
+static struct hw_interrupt_type lasat_irq_type = {
+        "Lasat",
+        startup_lasat_irq,
+        shutdown_lasat_irq,
+        enable_lasat_irq,
+        disable_lasat_irq,
+        mask_and_ack_lasat_irq,
+        end_lasat_irq,
+        NULL
+};
+
+static inline int ls1bit32(unsigned int x)
+{
+        int b = 31, s;
+
+        s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
+        s =  8; if (x <<  8 == 0) s = 0; b -= s; x <<= s;
+        s =  4; if (x <<  4 == 0) s = 0; b -= s; x <<= s;
+        s =  2; if (x <<  2 == 0) s = 0; b -= s; x <<= s;
+        s =  1; if (x <<  1 == 0) s = 0; b -= s;
+
+        return b;
+}
+
+static unsigned long (* get_int_status)(void);
+
+static unsigned long get_int_status_100(void)
+{
+        return *lasat_int_status & *lasat_int_mask;
+}
+
+static unsigned long get_int_status_200(void) 
+{
+        unsigned long int_status;
+
+        int_status = *lasat_int_status;
+        int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
+        return int_status;
+}
+
+void lasat_hw0_irqdispatch(struct pt_regs *regs)
+{
+        unsigned long int_status;
+        int irq;
+
+        int_status = get_int_status();
+
+        /* if int_status == 0, then the interrupt has already been cleared */
+        if (int_status) {
+                irq = ls1bit32(int_status);
+
+                do_IRQ(irq, regs);
+        }
+}
+
+void __init arch_init_irq(void)
+{
+        int i;
+
+        switch (mips_machtype) {
+        case MACH_LASAT_100:
+                lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
+                lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
+                lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
+                get_int_status = get_int_status_100;
+                *lasat_int_mask = 0;
+                break;
+        case MACH_LASAT_200:
+                lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
+                lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
+                lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
+                get_int_status = get_int_status_200;
+                *lasat_int_mask &= 0xffff;
+                break;
+        default:
+                panic("arch_init_irq: mips_machtype incorrect");
+        }
+
+        /* Now safe to set the exception vector. */
+        set_except_vector(0, lasatIRQ);
+
+        for (i = 0; i <= LASATINT_END; i++) {
+                irq_desc[i].status      = IRQ_DISABLED;
+                irq_desc[i].action      = 0;
+                irq_desc[i].depth       = 1;
+                irq_desc[i].handler     = &lasat_irq_type;
+        }
+}