/*      $OpenBSD: pci_kn20aa.c,v 1.31 2025/06/29 15:55:21 miod Exp $    */
/*      $NetBSD: pci_kn20aa.c,v 1.21 1996/11/17 02:05:27 cgd Exp $      */

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/syslog.h>

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/ppbreg.h>

#include <alpha/pci/ciareg.h>
#include <alpha/pci/ciavar.h>

#include <alpha/pci/pci_kn20aa.h>

#include "sio.h"
#if NSIO
#include <alpha/pci/siovar.h>
#endif

int     dec_kn20aa_intr_map(struct pci_attach_args *, pci_intr_handle_t *);
const char *dec_kn20aa_intr_string(void *, pci_intr_handle_t);
int     dec_kn20aa_intr_line(void *, pci_intr_handle_t);
void    *dec_kn20aa_intr_establish(void *, pci_intr_handle_t,
            int, int (*func)(void *), void *, const char *);
void    dec_kn20aa_intr_disestablish(void *, void *);

#define KN20AA_PCEB_IRQ 31
#define KN20AA_MAX_IRQ  32
#define PCI_STRAY_MAX   5

struct alpha_shared_intr *kn20aa_pci_intr;
struct evcount kn20aa_intr_count;

void    kn20aa_iointr(void *arg, unsigned long vec);
void    kn20aa_enable_intr(int irq);
void    kn20aa_disable_intr(int irq);

void
pci_kn20aa_pickintr(struct cia_config *ccp)
{
        int i;
        bus_space_tag_t iot = &ccp->cc_iot;
        pci_chipset_tag_t pc = &ccp->cc_pc;

        pc->pc_intr_v = ccp;
        pc->pc_intr_map = dec_kn20aa_intr_map;
        pc->pc_intr_string = dec_kn20aa_intr_string;
        pc->pc_intr_line = dec_kn20aa_intr_line;
        pc->pc_intr_establish = dec_kn20aa_intr_establish;
        pc->pc_intr_disestablish = dec_kn20aa_intr_disestablish;

        /* Not supported on KN20AA. */
        pc->pc_pciide_compat_intr_establish = NULL;
        pc->pc_pciide_compat_intr_disestablish = NULL;

        kn20aa_pci_intr = alpha_shared_intr_alloc(KN20AA_MAX_IRQ);
        for (i = 0; i < KN20AA_MAX_IRQ; i++)
                alpha_shared_intr_set_maxstrays(kn20aa_pci_intr, i,
                    PCI_STRAY_MAX);

#if NSIO
        sio_intr_setup(pc, iot);
        kn20aa_enable_intr(KN20AA_PCEB_IRQ);
#endif
}

int
dec_kn20aa_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
        pcitag_t bustag = pa->pa_intrtag;
        int buspin = pa->pa_intrpin;
        pci_chipset_tag_t pc = pa->pa_pc;
        int device;
        int kn20aa_irq;

        if (pa->pa_bridgetag) {
                buspin = PPB_INTERRUPT_SWIZZLE(pa->pa_rawintrpin,
                    pa->pa_device);
                if (pa->pa_bridgeih[buspin - 1] != 0) {
                        *ihp = pa->pa_bridgeih[buspin - 1];
                        return 0;
                }

                return 1;
        }

        /*
         * Slot->interrupt translation.  Appears to work, though it
         * may not hold up forever.
         *
         * The DEC engineers who did this hardware obviously engaged
         * in random drug testing.
         */
        pci_decompose_tag(pc, bustag, NULL, &device, NULL);
        switch (device) {
        case 11:
        case 12:
                kn20aa_irq = ((device - 11) + 0) * 4;
                break;

        case 7:
                kn20aa_irq = 8;
                break;

        case 9:
                kn20aa_irq = 12;
                break;

        case 6:                                 /* 21040 on AlphaStation 500 */
                kn20aa_irq = 13;
                break;

        case 8:
                kn20aa_irq = 16;
                break;

        default:
                printf("dec_kn20aa_intr_map: don't know how to setup %d/%d/%d\n",
                    pa->pa_bus, pa->pa_device, pa->pa_function);
                return 1;
        }

        if (kn20aa_irq != 13)
                kn20aa_irq += buspin - 1;

        if (kn20aa_irq >= KN20AA_MAX_IRQ) {
                printf("dec_kn20aa_intr_map: kn20aa_irq %d too large for %d/%d/%d\n",
                    kn20aa_irq, pa->pa_bus, pa->pa_device, pa->pa_function);
                return 1;
        }

        *ihp = kn20aa_irq;
        return 0;
}

const char *
dec_kn20aa_intr_string(void *ccv, pci_intr_handle_t ih)
{
        static char irqstr[15];   /* 11 + 2 + NULL + sanity */

        if (ih > KN20AA_MAX_IRQ)
                panic("dec_kn20aa_intr_string: bogus kn20aa IRQ 0x%lx", ih);

        snprintf(irqstr, sizeof irqstr, "kn20aa irq %ld", ih);
        return (irqstr);
}

int
dec_kn20aa_intr_line(void *ccv, pci_intr_handle_t ih)
{
        return (ih);
}

void *
dec_kn20aa_intr_establish(void *ccv, pci_intr_handle_t ih, int level,
    int (*func)(void *), void *arg, const char *name)
{
        void *cookie;

        if (ih > KN20AA_MAX_IRQ)
                panic("dec_kn20aa_intr_establish: bogus kn20aa IRQ 0x%lx",
                    ih);

        cookie = alpha_shared_intr_establish(kn20aa_pci_intr, ih, IST_LEVEL,
            level, func, arg, name);

        if (cookie != NULL &&
            alpha_shared_intr_firstactive(kn20aa_pci_intr, ih)) {
                scb_set(0x900 + SCB_IDXTOVEC(ih), kn20aa_iointr, NULL);
                kn20aa_enable_intr(ih);
        }
        return (cookie);
}

void
dec_kn20aa_intr_disestablish(void *ccv, void *cookie)
{
        struct alpha_shared_intrhand *ih = cookie;
        unsigned int irq = ih->ih_num;
        int s;

        s = splhigh();

        alpha_shared_intr_disestablish(kn20aa_pci_intr, cookie);
        if (alpha_shared_intr_isactive(kn20aa_pci_intr, irq) == 0) {
                kn20aa_disable_intr(irq);
                alpha_shared_intr_set_dfltsharetype(kn20aa_pci_intr, irq,
                    IST_NONE);
                scb_free(0x900 + SCB_IDXTOVEC(irq));
        }
        splx(s);
}

void
kn20aa_iointr(void *arg, unsigned long vec)
{
        int irq;

        irq = SCB_VECTOIDX(vec - 0x900);

        if (!alpha_shared_intr_dispatch(kn20aa_pci_intr, irq)) {
                alpha_shared_intr_stray(kn20aa_pci_intr, irq,
                    "kn20aa irq");
                if (ALPHA_SHARED_INTR_DISABLE(kn20aa_pci_intr, irq))
                        kn20aa_disable_intr(irq);
        } else
                alpha_shared_intr_reset_strays(kn20aa_pci_intr, irq);
}

void
kn20aa_enable_intr(int irq)
{

        /*
         * From disassembling small bits of the OSF/1 kernel:
         * the following appears to enable a given interrupt request.
         * "blech."  I'd give valuable body parts for better docs or
         * for a good decompiler.
         */
        alpha_mb();
        REGVAL(0x8780000000L + 0x40L) |= (1 << irq);    /* XXX */
        alpha_mb();
}

void
kn20aa_disable_intr(int irq)
{

        alpha_mb();
        REGVAL(0x8780000000L + 0x40L) &= ~(1 << irq);   /* XXX */
        alpha_mb();
}