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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1992 Linus Torvalds

 * Copyright (C) 1994 - 2000 Ralf Baechle

 */

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/kernel.h>

#include <linux/spinlock.h>

#include <asm/i8259.h>

#include <asm/io.h>

#include <asm/sni.h>

spinlock_t pciasic_lock = SPIN_LOCK_UNLOCKED;

extern asmlinkage void sni_rm200_pci_handle_int(void);

static void enable_pciasic_irq(unsigned int irq);

static unsigned int startup_pciasic_irq(unsigned int irq)

{

        enable_pciasic_irq(irq);

        return 0; /* never anything pending */

}

#define shutdown_pciasic_irq    disable_pciasic_irq

void disable_pciasic_irq(unsigned int irq)

{

        unsigned int mask = ~(1 << (irq - PCIMT_IRQ_INT2));

        unsigned long flags;

        spin_lock_irqsave(&pciasic_lock, flags);

        *(volatile u8 *) PCIMT_IRQSEL &= mask;

        spin_unlock_irqrestore(&pciasic_lock, flags);

}

static void enable_pciasic_irq(unsigned int irq)

{

        unsigned int mask = 1 << (irq - PCIMT_IRQ_INT2);

        unsigned long flags;

        spin_lock_irqsave(&pciasic_lock, flags);

        *(volatile u8 *) PCIMT_IRQSEL |= mask;

        spin_unlock_irqrestore(&pciasic_lock, flags);

}

#define mask_and_ack_pciasic_irq disable_pciasic_irq

static void end_pciasic_irq(unsigned int irq)

{

        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))

                enable_pciasic_irq(irq);

}

static struct hw_interrupt_type pciasic_irq_type = {

        "PCIASIC",

        startup_pciasic_irq,

        shutdown_pciasic_irq,

        enable_pciasic_irq,

        disable_pciasic_irq,

        mask_and_ack_pciasic_irq,

        end_pciasic_irq,

        NULL

};

/*

 * hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug

 * button interrupts.  Later ...

 */

void pciasic_hwint0(struct pt_regs *regs)

{

        panic("Received int0 but no handler yet ...");

}

/* This interrupt was used for the com1 console on the first prototypes.  */

void pciasic_hwint2(struct pt_regs *regs)

{

        /* I think this shouldn't happen on production machines.  */

        panic("hwint2 and no handler yet");

}

/* hwint5 is the r4k count / compare interrupt  */

void pciasic_hwint5(struct pt_regs *regs)

{

        panic("hwint5 and no handler yet");

}

static inline int ls1bit8(unsigned int x)

{

        int b = 8, s;

        x <<= 24;

        s = 4; if ((x & 0x0f) == 0) s = 0; b -= s; x <<= s;

        s = 2; if ((x & 0x03) == 0) s = 0; b -= s; x <<= s;

        s = 1; if ((x & 0x01) == 0) s = 0; b -= s;

        return b;

}

/*

 * hwint 1 deals with EISA and SCSI interrupts,

 * hwint 3 should deal with the PCI A - D interrupts,

 * hwint 4 is used for only the onboard PCnet 32.

 */

void pciasic_hwint134(struct pt_regs *regs)

{

        u8 pend = *(volatile char *)PCIMT_CSITPEND;

        int irq;

        irq = PCIMT_IRQ_INT2 + ls1bit8(pend);

        if (irq == PCIMT_IRQ_EISA) {

                pend = *(volatile char *)PCIMT_INT_ACKNOWLEDGE;

                if (!(pend ^ 0xff))

                        return;

        }

        do_IRQ(irq, regs);

        return;

}

void __init init_pciasic(void)

{

        unsigned long flags;

        spin_lock_irqsave(&pciasic_lock, flags);

        * (volatile u8 *) PCIMT_IRQSEL =

                IT_EISA | IT_INTA | IT_INTB | IT_INTC | IT_INTD;

        spin_unlock_irqrestore(&pciasic_lock, flags);

}

/*

 * On systems with i8259-style interrupt controllers we assume for

 * driver compatibility reasons interrupts 0 - 15 to be the i8295

 * interrupts even if the hardware uses a different interrupt numbering.

 */

void __init init_IRQ (void)

{

        int i;

        set_except_vector(0, sni_rm200_pci_handle_int);

        init_generic_irq();

        init_i8259_irqs();                      /* Integrated i8259  */

        init_pciasic();

        /* Actually we've got more interrupts to handle ...  */

        for (i = PCIMT_IRQ_INT2; i <= PCIMT_IRQ_ETHERNET; i++) {

                irq_desc[i].status     = IRQ_DISABLED;

                irq_desc[i].action     = 0;

                irq_desc[i].depth      = 1;

                irq_desc[i].handler    = &pciasic_irq_type;

        }

}