/* $NetBSD: u3.c,v 1.13 2025/11/10 05:55:46 macallan Exp $ */

/*
 * Copyright 2006 Kyma Systems LLC.
 * All rights reserved.
 *
 * Written by Sanjay Lal <sanjayl@kymasys.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Kyma Systems LLC.
 * 4. The name of Kyma Systems LLC may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY KYMA SYSTEMS LLC ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL KYMA SYSTEMS LLC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>

#include <dev/pci/pcivar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>

#include <machine/autoconf.h>
#include <machine/pio.h>

struct ibmcpc_softc
{
        device_t sc_dev;
        struct genppc_pci_chipset sc_pc[8];
        struct powerpc_bus_space sc_iot;
        struct powerpc_bus_space sc_memt;
        int sc_ranges[8];       
};

/* kinda ugly but there can be only one */
static struct ibmcpc_softc *cpc0 = NULL;

static void ibmcpc_attach(device_t, device_t, void *);
static int ibmcpc_match(device_t, cfdata_t, void *);

static pcireg_t ibmcpc_conf_read(void *, pcitag_t, int);
static void ibmcpc_conf_write(void *, pcitag_t, int, pcireg_t);

CFATTACH_DECL_NEW(ibmcpc, sizeof(struct ibmcpc_softc),
              ibmcpc_match, ibmcpc_attach, NULL, NULL);

#define PCI_DEVFN(slot,func)    ((((slot) & 0x1f) << 3) | ((func) & 0x07))

static int
ibmcpc_match(device_t parent, cfdata_t cf, void *aux)
{
        struct confargs *ca = aux;
        char compat[32];

        if (strcmp(ca->ca_name, "ht") != 0)
                return 0;

        memset(compat, 0, sizeof(compat));
        OF_getprop(ca->ca_node, "compatible", compat, sizeof(compat));

        if (strcmp(compat, "u3-ht") != 0)
                return 0;

        return 1;
}

static void
ibmcpc_attach(device_t parent, device_t self, void *aux)
{
        struct ibmcpc_softc *sc = device_private(self);
        pci_chipset_tag_t pc = sc->sc_pc;
        struct confargs *ca = aux;
        struct pcibus_attach_args pba;
        int node = ca->ca_node, child;
        uint32_t reg[6], busrange[2], i;
        void *pc_data;
        char name[32];

        aprint_normal("\n");
        sc->sc_dev = self;

        /* u3 address */
        if (OF_getprop(node, "reg", reg, sizeof(reg)) < 24) {
                return;
        }
        aprint_normal("Mapping in config space @ pa 0x%08x, size: 0x%08x\n",
            reg[1], reg[2]);
        pc_data = mapiodev(reg[1], reg[2], false);

        cpc0 = sc;

        for (child = OF_child(OF_finddevice("/ht")), i = 1; child;
            child = OF_peer(child), i++) {

                memset(name, 0, sizeof(name));

                if (OF_getprop(child, "name", name, sizeof(name)) == -1)
                        continue;

                if (strcmp(name, "pci") != 0)
                        continue;

                if (OF_getprop(child, "bus-range", busrange, 8) < 8)
                        continue;

                memset(&sc->sc_iot, 0, sizeof(sc->sc_iot));
                sc->sc_iot.pbs_flags = _BUS_SPACE_LITTLE_ENDIAN |
                    _BUS_SPACE_IO_TYPE;
                sc->sc_iot.pbs_base = 0x00000000;
                if (ofwoea_map_space(RANGE_TYPE_PCI, RANGE_IO, child,
                    &sc->sc_iot, "ibmcpc io") != 0)
                        panic("Can't init ibmcpc io tag");

                memset(&sc->sc_memt, 0, sizeof(sc->sc_memt));
                sc->sc_memt.pbs_flags = _BUS_SPACE_LITTLE_ENDIAN |
                    _BUS_SPACE_MEM_TYPE;
                sc->sc_memt.pbs_base = 0x00000000;
                if (ofwoea_map_space(RANGE_TYPE_PCI, RANGE_MEM, child,
                    &sc->sc_memt, "ibmcpc mem") != 0)
                        panic("Can't init ibmcpc mem tag");

                macppc_pci_get_chipset_tag(pc);
                pc->pc_node = child;
                pc->pc_bus = busrange[0];
                sc->sc_ranges[pc->pc_bus] = busrange[1];
                pc->pc_addr = 0x0;
                pc->pc_data = pc_data;
                pc->pc_conf_read = ibmcpc_conf_read;
                pc->pc_conf_write = ibmcpc_conf_write;
                pc->pc_memt = &sc->sc_memt;
                pc->pc_iot = &sc->sc_iot;

                memset(&pba, 0, sizeof(pba));
                pba.pba_memt = pc->pc_memt;
                pba.pba_iot = pc->pc_iot;
                pba.pba_dmat = &pci_bus_dma_tag;
                pba.pba_dmat64 = NULL;
                pba.pba_bridgetag = NULL;
                pba.pba_pc = pc;
                pba.pba_bus = pc->pc_bus;
                pba.pba_flags = PCI_FLAGS_MEM_OKAY | PCI_FLAGS_IO_OKAY;

                config_found(self, &pba, pcibusprint,
                    CFARGS(.devhandle = devhandle_from_of(device_handle(self), child)));

                pc++;
        }
}

static pcireg_t
ibmcpc_conf_read(void *cookie, pcitag_t tag, int reg)
{
        pci_chipset_tag_t pc = cookie;
        struct ibmcpc_softc *sc = cpc0;
        u_int32_t daddr = (u_int32_t) pc->pc_data;
        pcireg_t data;
        u_int32_t bus, dev, func, x, devfn;

        if ((unsigned int)reg >= PCI_CONF_SIZE)
                return (pcireg_t) -1;

        pci_decompose_tag(pc, tag, &bus, &dev, &func);

        if ((bus < pc->pc_bus) || (bus > sc->sc_ranges[pc->pc_bus])) {
                data = 0xffffffff;
                goto done;
        }                

        devfn = PCI_DEVFN(dev, func);

        if (bus == 0) {

                if (devfn == 0x0) {

                        data = 0xffffffff;
                        goto done;
                }

                x = daddr + ((devfn << 8) | reg);
        } else
                x = daddr + ((devfn << 8) | reg) + (bus << 16) + 0x01000000UL;

        data = in32rb(x);

done:
        return data;
}

static void
ibmcpc_conf_write(void *cookie, pcitag_t tag, int reg, pcireg_t data)
{
        pci_chipset_tag_t pc = cookie;
        struct ibmcpc_softc *sc = cpc0;
        int32_t *daddr = pc->pc_data;
        u_int32_t bus, dev, func;
        u_int32_t x, devfn;

        if ((unsigned int)reg >= PCI_CONF_SIZE)
                return;

        pci_decompose_tag(pc, tag, &bus, &dev, &func);

        if ((bus < pc->pc_bus) || (bus > sc->sc_ranges[pc->pc_bus]))
                return;

        devfn = PCI_DEVFN(dev, func);

        if (bus == 0) {

                if (devfn == 0x0) {
                        goto done;
                }
                x = (u_int32_t) daddr + ((devfn << 8) | reg);
        } else
                x = (u_int32_t) daddr + ((devfn << 8) | reg) + (bus << 16) +
                    0x01000000UL;

        out32rb(x, data);

done:
        return;
}