/*      $OpenBSD: pci_2100_a50.c,v 1.28 2025/06/29 15:55:21 miod Exp $  */
/*      $NetBSD: pci_2100_a50.c,v 1.12 1996/11/13 21:13:29 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/device.h>
#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/intr.h>

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

#include <alpha/pci/apecsvar.h>

#include <alpha/pci/pci_2100_a50.h>
#include <alpha/pci/siovar.h>
#include <alpha/pci/sioreg.h>

#include "sio.h"

int     dec_2100_a50_intr_map(struct pci_attach_args *, pci_intr_handle_t *);
const char *dec_2100_a50_intr_string(void *, pci_intr_handle_t);
int      dec_2100_a50_intr_line(void *, pci_intr_handle_t);
void    *dec_2100_a50_intr_establish(void *, pci_intr_handle_t,
            int, int (*func)(void *), void *, const char *);
void    dec_2100_a50_intr_disestablish(void *, void *);

#define APECS_SIO_DEVICE        7       /* XXX */

void
pci_2100_a50_pickintr(struct apecs_config *acp)
{
        bus_space_tag_t iot = &acp->ac_iot;
        pci_chipset_tag_t pc = &acp->ac_pc;
        pcireg_t sioclass;
        int sioII;

        /* XXX MAGIC NUMBER */
        sioclass = pci_conf_read(pc, pci_make_tag(pc, 0, 7, 0), PCI_CLASS_REG);
        sioII = (sioclass & 0xff) >= 3;

        if (!sioII)
                printf("WARNING: SIO NOT SIO II... NO BETS...\n");

        pc->pc_intr_v = acp;
        pc->pc_intr_map = dec_2100_a50_intr_map;
        pc->pc_intr_string = dec_2100_a50_intr_string;
        pc->pc_intr_line = dec_2100_a50_intr_line;
        pc->pc_intr_establish = dec_2100_a50_intr_establish;
        pc->pc_intr_disestablish = dec_2100_a50_intr_disestablish;

        /* Not supported on 2100 A50. */
        pc->pc_pciide_compat_intr_establish = NULL;
        pc->pc_pciide_compat_intr_disestablish = NULL;

#if NSIO
        sio_intr_setup(pc, iot);
#else
        panic("pci_2100_a50_pickintr: no I/O interrupt handler (no sio)");
#endif
}

int
dec_2100_a50_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
        pcitag_t bustag = pa->pa_intrtag;
        pci_chipset_tag_t pc = pa->pa_pc;
        int buspin, device, pirq;
        pcireg_t pirqreg;
        u_int8_t pirqline;

        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;
        }

        buspin = pa->pa_intrpin;
        pci_decompose_tag(pc, bustag, NULL, &device, NULL);

        switch (device) {
        case 6:                                 /* NCR SCSI */
                pirq = 3;
                break;

        case 11:                                /* slot 1 */
        case 14:                                /* slot 3 */
                switch (buspin) {
                default:
                case PCI_INTERRUPT_PIN_A:
                case PCI_INTERRUPT_PIN_D:
                        pirq = 0;
                        break;
                case PCI_INTERRUPT_PIN_B:
                        pirq = 2;
                        break;
                case PCI_INTERRUPT_PIN_C:
                        pirq = 1;
                        break;
                }
                break;

        case 12:                                /* slot 2 */
                switch (buspin) {
                default:
                case PCI_INTERRUPT_PIN_A:
                case PCI_INTERRUPT_PIN_D:
                        pirq = 1;
                        break;
                case PCI_INTERRUPT_PIN_B:
                        pirq = 0;
                        break;
                case PCI_INTERRUPT_PIN_C:
                        pirq = 2;
                        break;
                }
                break;

        case 13:                                /* slot 3 */
                switch (buspin) {
                default:
                case PCI_INTERRUPT_PIN_A:
                case PCI_INTERRUPT_PIN_D:
                        pirq = 2;
                        break;
                case PCI_INTERRUPT_PIN_B:
                        pirq = 1;
                        break;
                case PCI_INTERRUPT_PIN_C:
                        pirq = 0;
                        break;
                }
                break;

        default:
                printf("dec_2100_a50_intr_map: don't know how to setup %d/%d/%d\n",
                    pa->pa_bus, pa->pa_device, pa->pa_function);
                return 1;
        }

        pirqreg = pci_conf_read(pc, pci_make_tag(pc, 0, APECS_SIO_DEVICE, 0),
            SIO_PCIREG_PIRQ_RTCTRL);
        pirqline = (pirqreg >> (pirq * 8)) & 0xff;
        if ((pirqline & 0x80) != 0)
                return 1;
        pirqline &= 0xf;

        *ihp = pirqline;
        return 0;
}

const char *
dec_2100_a50_intr_string(void *acv, pci_intr_handle_t ih)
{
        return sio_intr_string(NULL /*XXX*/, ih);
}

int
dec_2100_a50_intr_line(void *acv, pci_intr_handle_t ih)
{
        return sio_intr_line(NULL /*XXX*/, ih);
}

void *
dec_2100_a50_intr_establish(void *acv, pci_intr_handle_t ih, int level,
    int (*func)(void *), void *arg, const char *name)
{
        return sio_intr_establish(NULL /*XXX*/, ih, IST_LEVEL, level, func,
            arg, name);
}

void
dec_2100_a50_intr_disestablish(void *acv, void *cookie)
{
        sio_intr_disestablish(NULL /*XXX*/, cookie);
}