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, 161 insertions, 0 deletions

diff --git a/arch/mips/kernel/irq-mv6434x.c b/arch/mips/kernel/irq-mv6434x.c
new file mode 100644
index 00000000000..088bbbc869e
--- /dev/null
+++ b/arch/mips/kernel/irq-mv6434x.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2002 Momentum Computer
+ * Author: mdharm@momenco.com
+ * Copyright (C) 2004 Ralf Baechle <ralf@linux-mips.org>
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <asm/ptrace.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <linux/mv643xx.h>
+
+static unsigned int irq_base;
+
+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;
+}
+
+/* mask off an interrupt -- 1 is enable, 0 is disable */
+static inline void mask_mv64340_irq(unsigned int irq)
+{
+	uint32_t value;
+
+	if (irq < (irq_base + 32)) {
+		value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
+		value &= ~(1 << (irq - irq_base));
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
+	} else {
+		value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
+		value &= ~(1 << (irq - irq_base - 32));
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value);
+	}
+}
+
+/* unmask an interrupt -- 1 is enable, 0 is disable */
+static inline void unmask_mv64340_irq(unsigned int irq)
+{
+	uint32_t value;
+
+	if (irq < (irq_base + 32)) {
+		value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
+		value |= 1 << (irq - irq_base);
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
+	} else {
+		value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
+		value |= 1 << (irq - irq_base - 32);
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value);
+	}
+}
+
+/*
+ * Enables the IRQ on Marvell Chip
+ */
+static void enable_mv64340_irq(unsigned int irq)
+{
+	unmask_mv64340_irq(irq);
+}
+
+/*
+ * Initialize the IRQ on Marvell Chip
+ */
+static unsigned int startup_mv64340_irq(unsigned int irq)
+{
+	unmask_mv64340_irq(irq);
+	return 0;
+}
+
+/*
+ * Disables the IRQ on Marvell Chip
+ */
+static void disable_mv64340_irq(unsigned int irq)
+{
+	mask_mv64340_irq(irq);
+}
+
+/*
+ * Masks and ACKs an IRQ
+ */
+static void mask_and_ack_mv64340_irq(unsigned int irq)
+{
+	mask_mv64340_irq(irq);
+}
+
+/*
+ * End IRQ processing
+ */
+static void end_mv64340_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		unmask_mv64340_irq(irq);
+}
+
+/*
+ * Interrupt handler for interrupts coming from the Marvell chip.
+ * It could be built in ethernet ports etc...
+ */
+void ll_mv64340_irq(struct pt_regs *regs)
+{
+	unsigned int irq_src_low, irq_src_high;
+ 	unsigned int irq_mask_low, irq_mask_high;
+
+	/* read the interrupt status registers */
+	irq_mask_low = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
+	irq_mask_high = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
+	irq_src_low = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_LOW);
+	irq_src_high = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_HIGH);
+
+	/* mask for just the interrupts we want */
+	irq_src_low &= irq_mask_low;
+	irq_src_high &= irq_mask_high;
+
+	if (irq_src_low)
+		do_IRQ(ls1bit32(irq_src_low) + irq_base, regs);
+	else
+		do_IRQ(ls1bit32(irq_src_high) + irq_base + 32, regs);
+}
+
+#define shutdown_mv64340_irq	disable_mv64340_irq
+
+struct hw_interrupt_type mv64340_irq_type = {
+	"MV-64340",
+	startup_mv64340_irq,
+	shutdown_mv64340_irq,
+	enable_mv64340_irq,
+	disable_mv64340_irq,
+	mask_and_ack_mv64340_irq,
+	end_mv64340_irq,
+	NULL
+};
+
+void __init mv64340_irq_init(unsigned int base)
+{
+	int i;
+
+	/* Reset irq handlers pointers to NULL */
+	for (i = base; i < base + 64; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = 0;
+		irq_desc[i].depth = 2;
+		irq_desc[i].handler = &mv64340_irq_type;
+	}
+
+	irq_base = base;
+}