Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 142 insertions, 0 deletions

diff --git a/arch/mips/mips-boards/atlas/atlas_int.c b/arch/mips/mips-boards/atlas/atlas_int.c
new file mode 100644
index 000000000000..8f1d875217a2
--- /dev/null
+++ b/arch/mips/mips-boards/atlas/atlas_int.c
@@ -0,0 +1,142 @@
+/*
+ * 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 MIPS
+ * Atlas board.
+ *
+ */
+#include <linux/compiler.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/mips-boards/atlas.h>
+#include <asm/mips-boards/atlasint.h>
+#include <asm/gdb-stub.h>
+
+
+static struct atlas_ictrl_regs *atlas_hw0_icregs;
+
+extern asmlinkage void mipsIRQ(void);
+
+#if 0
+#define DEBUG_INT(x...) printk(x)
+#else
+#define DEBUG_INT(x...)
+#endif
+
+void disable_atlas_irq(unsigned int irq_nr)
+{
+        atlas_hw0_icregs->intrsten = (1 << (irq_nr-ATLASINT_BASE));
+        iob();
+}
+
+void enable_atlas_irq(unsigned int irq_nr)
+{
+        atlas_hw0_icregs->intseten = (1 << (irq_nr-ATLASINT_BASE));
+        iob();
+}
+
+static unsigned int startup_atlas_irq(unsigned int irq)
+{
+        enable_atlas_irq(irq);
+        return 0; /* never anything pending */
+}
+
+#define shutdown_atlas_irq      disable_atlas_irq
+
+#define mask_and_ack_atlas_irq disable_atlas_irq
+
+static void end_atlas_irq(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+                enable_atlas_irq(irq);
+}
+
+static struct hw_interrupt_type atlas_irq_type = {
+        "Atlas",
+        startup_atlas_irq,
+        shutdown_atlas_irq,
+        enable_atlas_irq,
+        disable_atlas_irq,
+        mask_and_ack_atlas_irq,
+        end_atlas_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;
+}
+
+void atlas_hw0_irqdispatch(struct pt_regs *regs)
+{
+        unsigned long int_status;
+        int irq;
+
+        int_status = atlas_hw0_icregs->intstatus;
+
+        /* if int_status == 0, then the interrupt has already been cleared */
+        if (unlikely(int_status == 0))
+                return;
+
+        irq = ATLASINT_BASE + ls1bit32(int_status);
+
+        DEBUG_INT("atlas_hw0_irqdispatch: irq=%d\n", irq);
+
+        do_IRQ(irq, regs);
+}
+
+void __init arch_init_irq(void)
+{
+        int i;
+
+        atlas_hw0_icregs = (struct atlas_ictrl_regs *)ioremap (ATLAS_ICTRL_REGS_BASE, sizeof(struct atlas_ictrl_regs *));
+        
+        /*
+         * Mask out all interrupt by writing "1" to all bit position in
+         * the interrupt reset reg.
+         */
+        atlas_hw0_icregs->intrsten = 0xffffffff;
+
+        /* Now safe to set the exception vector. */
+        set_except_vector(0, mipsIRQ);
+
+        for (i = ATLASINT_BASE; i <= ATLASINT_END; i++) {
+                irq_desc[i].status      = IRQ_DISABLED;
+                irq_desc[i].action      = 0;
+                irq_desc[i].depth       = 1;
+                irq_desc[i].handler     = &atlas_irq_type;
+                spin_lock_init(&irq_desc[i].lock);
+        }
+}