/*      $OpenBSD: lca_pci.c,v 1.13 2025/06/28 16:04:09 miod Exp $       */
/* $NetBSD: lca_pci.c,v 1.13 1997/09/02 13:19:35 thorpej 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/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>   /* badaddr proto */

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/lcareg.h>
#include <alpha/pci/lcavar.h>

void            lca_attach_hook(struct device *, struct device *,
                    struct pcibus_attach_args *);
int             lca_bus_maxdevs(void *, int);
pcitag_t        lca_make_tag(void *, int, int, int);
void            lca_decompose_tag(void *, pcitag_t, int *, int *,
                    int *);
int             lca_conf_size(void *, pcitag_t);
pcireg_t        lca_conf_read(void *, pcitag_t, int);
void            lca_conf_write(void *, pcitag_t, int, pcireg_t);

void
lca_pci_init(pci_chipset_tag_t pc, void *v)
{

        pc->pc_conf_v = v;
        pc->pc_attach_hook = lca_attach_hook;
        pc->pc_bus_maxdevs = lca_bus_maxdevs;
        pc->pc_make_tag = lca_make_tag;
        pc->pc_decompose_tag = lca_decompose_tag;
        pc->pc_conf_size = lca_conf_size;
        pc->pc_conf_read = lca_conf_read;
        pc->pc_conf_write = lca_conf_write;
}

void
lca_attach_hook(struct device *parent, struct device *self,
    struct pcibus_attach_args *pba)
{
}

int
lca_bus_maxdevs(void *cpv, int busno)
{

        if (busno == 0)
                return 16;
        else
                return 32;
}

pcitag_t
lca_make_tag(void *cpv, int b, int d, int f)
{

        return (b << 16) | (d << 11) | (f << 8);
}

void
lca_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
{

        if (bp != NULL)
                *bp = (tag >> 16) & 0xff;
        if (dp != NULL)
                *dp = (tag >> 11) & 0x1f;
        if (fp != NULL)
                *fp = (tag >> 8) & 0x7;
}

int
lca_conf_size(void *cpv, pcitag_t tag)
{
        return PCI_CONFIG_SPACE_SIZE;
}

pcireg_t
lca_conf_read(void *cpv, pcitag_t tag, int offset)
{
        struct lca_config *lcp = cpv;
        pcireg_t *datap, data;
        int s, secondary, device, ba;

        s = 0;                                  /* XXX gcc -Wuninitialized */

        alpha_mb();
        REGVAL64(LCA_IOC_STAT0) = REGVAL64(LCA_IOC_STAT0);
        alpha_mb();

        /* secondary if bus # != 0 */
        pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &device, NULL);
        if (secondary) {
                s = splhigh();
                alpha_mb();
                REGVAL(LCA_IOC_CONF) = 0x01;
                alpha_mb();
        } else {
                /*
                 * on the LCA, must frob the tag used for
                 * devices on the primary bus, in the same ways
                 * as is used by type 1 configuration cycles
                 * on PCs.
                 */
                tag = (1 << (device + 11)) | (tag & 0x7ff);
        }

        datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
            tag << 5UL |                                        /* XXX */
            (offset & ~0x03) << 5 |                             /* XXX */
            0 << 5 |                                            /* XXX */
            0x3 << 3);                                          /* XXX */
        data = (pcireg_t)-1;
        if (!(ba = badaddr(datap, sizeof *datap))) {
                if (REGVAL64(LCA_IOC_STAT0) & IOC_STAT0_ERR) {
                        alpha_mb();
                        REGVAL64(LCA_IOC_STAT0) = REGVAL64(LCA_IOC_STAT0);
                        alpha_mb();
                } else
                        data = *datap;
        }

        if (secondary) {
                alpha_mb();
                REGVAL(LCA_IOC_CONF) = 0x00;
                alpha_mb();
                splx(s);
        }

#if 0
        printf("lca_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
            data, datap, ba ? " (badaddr)" : "");
#endif

        return data;
}

void
lca_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
{
        struct lca_config *lcp = cpv;
        pcireg_t *datap;
        int s, secondary, device;

        s = 0;                                  /* XXX gcc -Wuninitialized */

        /* secondary if bus # != 0 */
        pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &device, NULL);
        if (secondary) {
                s = splhigh();
                alpha_mb();
                REGVAL(LCA_IOC_CONF) = 0x01;
                alpha_mb();
        } else {
                /*
                 * on the LCA, must frob the tag used for
                 * devices on the primary bus, in the same ways
                 * as is used by type 1 configuration cycles
                 * on PCs.
                 */
                tag = (1 << (device + 11)) | (tag & 0x7ff);
        }

        datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
            tag << 5UL |                                        /* XXX */
            (offset & ~0x03) << 5 |                             /* XXX */
            0 << 5 |                                            /* XXX */
            0x3 << 3);                                          /* XXX */
        *datap = data;

        if (secondary) {
                alpha_mb();
                REGVAL(LCA_IOC_CONF) = 0x00;    
                alpha_mb();
                splx(s);
        }

#if 0
        printf("lca_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
            reg, data, datap);
#endif
}