Linux-2.6.12-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!
diff --git a/arch/mips/kernel/irq-mv6434x.c b/arch/mips/kernel/irq-mv6434x.c
new file mode 100644
index 0000000..088bbbc
--- /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;
+}
