patch-2.4.23 linux-2.4.23/arch/sh/kernel/irq_microdev.c

• Lines: 159
• Date: 2003-11-28 10:26:19.000000000 -0800
• Orig file: linux-2.4.22/arch/sh/kernel/irq_microdev.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.22/arch/sh/kernel/irq_microdev.c linux-2.4.23/arch/sh/kernel/irq_microdev.c
@@ -0,0 +1,158 @@
+/* 
+ * linux/arch/sh/kernel/irq_microdev.c
+ *
+ * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
+ *
+ * SuperH SH4-202 MicroDev board support.
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq_microdev.h>
+
+#define NUM_EXTERNAL_IRQS 16	/* IRL0 .. IRL15 */
+
+
+static const struct 
+{
+	unsigned char fpgaIrq;
+	unsigned char mapped;
+	const char *name;
+}	fpgaIrqTable[NUM_EXTERNAL_IRQS] = 
+{
+	{ 0,	0,	"unused" },		/* IRQ #0	IRL=15	0x200  */
+	{ 0,	0,	"unused" },		/* IRQ #1	IRL=14	0x220  */
+	{ 0,	0,	"unused" },		/* IRQ #2	IRL=13	0x240  */
+	{ 18,	1,	"Ethernet" },		/* IRQ #3	IRL=12	0x260  */
+	{ 0,	0,	"unused" },		/* IRQ #4	IRL=11	0x280  */
+	{ 0,	0,	"unused" },		/* IRQ #5	IRL=10	0x2a0  */
+	{ 0,	0,	"unused" },		/* IRQ #6	IRL=9	0x2c0  */
+	{ 0,	0,	"unused" },		/* IRQ #7	IRL=8	0x2e0  */
+	{ 8,	1,	"PCI INTA" },		/* IRQ #8	IRL=7	0x300  */
+	{ 9,	1,	"PCI INTB" },		/* IRQ #9	IRL=6	0x320  */
+	{ 10,	1,	"PCI INTC" },		/* IRQ #10	IRL=5	0x340  */
+	{ 11,	1,	"PCI INTD" },		/* IRQ #11	IRL=4	0x360  */
+	{ 0,	0,	"unused" },		/* IRQ #12	IRL=3	0x380  */
+	{ 0,	0,	"unused" },		/* IRQ #13	IRL=2	0x3a0  */
+	{ 0,	0,	"unused" },		/* IRQ #14	IRL=1	0x3c0  */
+	{ 0,	0,	"unused" },		/* IRQ #15	IRL=0	0x3e0  */
+};
+
+static void enable_microdev_irq(unsigned int irq);
+static void disable_microdev_irq(unsigned int irq);
+
+	/* shutdown is same as "disable" */
+#define shutdown_microdev_irq disable_microdev_irq
+
+static void mask_and_ack_microdev(unsigned int);
+static void end_microdev_irq(unsigned int irq);
+
+static unsigned int startup_microdev_irq(unsigned int irq)
+{
+	enable_microdev_irq(irq);
+	return 0;		/* never anything pending */
+}
+
+static struct hw_interrupt_type microdev_irq_type = {
+	"MicroDev-IRQ",
+	startup_microdev_irq,
+	shutdown_microdev_irq,
+	enable_microdev_irq,
+	disable_microdev_irq,
+	mask_and_ack_microdev,
+	end_microdev_irq
+};
+
+static void disable_microdev_irq(unsigned int irq)
+{
+	unsigned int flags; 
+	unsigned int fpgaIrq; 
+
+	if (irq >= NUM_EXTERNAL_IRQS) return;
+	if (!fpgaIrqTable[irq].mapped) return;
+
+	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
+
+		/* disable interrupts */
+	save_and_cli(flags);
+
+		/* disable interupts on the FPGA INTC register */
+	ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
+
+		/* restore interrupts */
+	restore_flags(flags);
+}
+
+static void enable_microdev_irq(unsigned int irq)
+{
+	unsigned long priorityReg, priorities, pri;
+	unsigned int flags; 
+	unsigned int fpgaIrq; 
+
+
+	if (irq >= NUM_EXTERNAL_IRQS) return;
+	if (!fpgaIrqTable[irq].mapped) return;
+
+	pri = 15 - irq;
+
+	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
+	priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
+
+		/* disable interrupts */
+	save_and_cli(flags);
+
+		/* set priority for the interrupt */
+	priorities = ctrl_inl(priorityReg);
+	priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
+	priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
+	ctrl_outl(priorities, priorityReg);
+	
+		/* enable interupts on the FPGA INTC register */
+	ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
+
+		/* restore interrupts */
+	restore_flags(flags);
+}
+
+	/* This functions sets the desired irq handler to be a MicroDev type */
+static void __init make_microdev_irq(unsigned int irq)
+{
+	disable_irq_nosync(irq);
+	irq_desc[irq].handler = &microdev_irq_type;
+	disable_microdev_irq(irq);
+}
+
+static void mask_and_ack_microdev(unsigned int irq)
+{
+	disable_microdev_irq(irq);
+}
+
+static void end_microdev_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+	{
+		enable_microdev_irq(irq);
+	}
+}
+
+extern void __init init_microdev_irq(void)
+{
+	int i;
+
+		/* disable interupts on the FPGA INTC register */
+	ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
+
+	for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
+	{
+		make_microdev_irq(i);
+	}
+}
+
+