patch-2.4.22 linux-2.4.22/arch/mips/momentum/ocelot_c/mv-irq.c

• Lines: 165
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/momentum/ocelot_c/mv-irq.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/momentum/ocelot_c/mv-irq.c linux-2.4.22/arch/mips/momentum/ocelot_c/mv-irq.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2002 Momentum Computer
+ * Author: mdharm@momenco.com
+ *
+ * arch/mips/momentum/ocelot_c/mv-irq.c
+ *     Interrupt routines for mv64340.  Interrupt numbers are assigned from
+ *     MV64340_IRQ_BASE to MV64340_IRQ_BASE+64.
+ *
+ * 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/irq.h>
+#include <linux/kernel.h>
+#include <asm/ptrace.h>
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <asm/io.h>
+#include <asm/mv64340.h>
+
+#define MV64340_IRQ_BASE	16
+
+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 < (MV64340_IRQ_BASE + 32)) {
+		MV_READ(MV64340_INTERRUPT0_MASK_0_LOW, &value);
+		value &= ~(1 << (irq - MV64340_IRQ_BASE));
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
+	} else {
+		MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH, &value);
+		value &= ~(1 << (irq - (MV64340_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 < (MV64340_IRQ_BASE + 32)) {
+		MV_READ(MV64340_INTERRUPT0_MASK_0_LOW, &value);
+		value |= 1 << (irq - MV64340_IRQ_BASE);
+		MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
+	} else {
+		MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH, &value);
+		value |= 1 << (irq - (MV64340_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 */
+	MV_READ(MV64340_INTERRUPT0_MASK_0_LOW, &irq_mask_low);
+	MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH, &irq_mask_high);
+	MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_LOW, &irq_src_low);
+	MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_HIGH, &irq_src_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) + MV64340_IRQ_BASE, regs);
+	else
+		do_IRQ(ls1bit32(irq_src_high) + MV64340_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 mv64340_irq_init(void)
+{
+	int i;
+
+	/* Reset irq handlers pointers to NULL */
+	for (i = MV64340_IRQ_BASE; i < (MV64340_IRQ_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;
+	}
+}