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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 = &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);

        }

}