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/*
* 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 = µdev_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);
}
}
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