/*      $NetBSD: bandit.c,v 1.35 2022/01/21 19:12:28 thorpej Exp $      */

/*-
* Copyright (c) 2000 Tsubai Masanari.  All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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>
__KERNEL_RCSID(0, "$NetBSD: bandit.c,v 1.35 2022/01/21 19:12:28 thorpej Exp $");

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

struct bandit_softc {
       device_t sc_dev;
       struct genppc_pci_chipset sc_pc;
       struct powerpc_bus_space sc_iot;
       struct powerpc_bus_space sc_memt;
       boolean_t sc_is_chaos;
};

static void bandit_attach(device_t, device_t, void *);
static int bandit_match(device_t, cfdata_t, void *);

static pcireg_t bandit_conf_read(void *, pcitag_t, int);
static void bandit_conf_write(void *, pcitag_t, int, pcireg_t);
static void chaos_conf_write(void *, pcitag_t, int, pcireg_t);

static void bandit_init(struct bandit_softc *);

CFATTACH_DECL_NEW(bandit, sizeof(struct bandit_softc),
   bandit_match, bandit_attach, NULL, NULL);

static int
bandit_match(device_t parent, cfdata_t cf, void *aux)
{
       struct confargs *ca = aux;

       if (strcmp(ca->ca_name, "bandit") == 0 ||
           strcmp(ca->ca_name, "chaos") == 0)
               return 1;

       return 0;
}

static void
bandit_attach(device_t parent, device_t self, void *aux)
{
       struct bandit_softc *sc = device_private(self);
       pci_chipset_tag_t pc = &sc->sc_pc;
       struct confargs *ca = aux;
       struct pcibus_attach_args pba;
       int len, node = ca->ca_node;
       uint32_t reg[2], busrange[2];
       struct range {
               uint32_t pci_hi, pci_mid, pci_lo;
               uint32_t host;
               uint32_t size_hi, size_lo;
       } ranges[6], *rp = ranges;

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

       sc->sc_is_chaos = (strcmp(ca->ca_name, "chaos") == 0);

       /* Bandit address */
       if (OF_getprop(node, "reg", reg, sizeof(reg)) < 8)
               return;

       /* PCI bus number */
       if (OF_getprop(node, "bus-range", busrange, sizeof(busrange)) != 8)
               return;

       /* find i/o tag */
       len = OF_getprop(node, "ranges", ranges, sizeof(ranges));
       if (len == -1)
               return;
       while (len >= sizeof(ranges[0])) {
               if ((rp->pci_hi & OFW_PCI_PHYS_HI_SPACEMASK) ==
                    OFW_PCI_PHYS_HI_SPACE_IO) {
                       sc->sc_iot.pbs_base = rp->host;
                       sc->sc_iot.pbs_limit = rp->host + rp->size_lo;
                       break;
               }
               len -= sizeof(ranges[0]);
               rp++;
       }
       memset(&sc->sc_iot, 0, sizeof(struct powerpc_bus_space));
       memset(&sc->sc_memt, 0, sizeof(struct powerpc_bus_space));
       sc->sc_iot.pbs_flags = _BUS_SPACE_LITTLE_ENDIAN|_BUS_SPACE_IO_TYPE;
       if (ofwoea_map_space(RANGE_TYPE_PCI, RANGE_IO, node, &sc->sc_iot,
           "bandit io-space") != 0)
               panic("Can't init bandit io tag");

       sc->sc_memt.pbs_flags = _BUS_SPACE_LITTLE_ENDIAN|_BUS_SPACE_MEM_TYPE;
       if (ofwoea_map_space(RANGE_TYPE_PCI, RANGE_MEM, node, &sc->sc_memt,
           "bandit mem-space") != 0)
               panic("Can't init bandit mem tag");

       macppc_pci_get_chipset_tag(pc);
       pc->pc_node = node;
       pc->pc_iot = &sc->sc_iot;
       pc->pc_memt = &sc->sc_memt;
       pc->pc_addr = mapiodev(reg[0] + 0x800000, 4, false);
       pc->pc_data = mapiodev(reg[0] + 0xc00000, 8, false);
       pc->pc_bus = busrange[0];
       pc->pc_conf_read = bandit_conf_read;
       if (sc->sc_is_chaos) {
               pc->pc_conf_write = chaos_conf_write;
       } else
               pc->pc_conf_write = bandit_conf_write;

       bandit_init(sc);

       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_bus = pc->pc_bus;
       pba.pba_bridgetag = NULL;
       pba.pba_pc = pc;
       pba.pba_flags = PCI_FLAGS_IO_OKAY | PCI_FLAGS_MEM_OKAY;

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

static pcireg_t
bandit_conf_read(void *cookie, pcitag_t tag, int reg)
{
       pci_chipset_tag_t pc = cookie;
       pcireg_t data;
       int bus, dev, func, s;
       uint32_t x;

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

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

       /*
        * bandit's minimum device number of the first bus is 11.
        * So we behave as if there is no device when dev < 11.
        */
       if (func > 7)
               panic("pci_conf_read: func > 7");

       if (bus == pc->pc_bus) {
               if (dev < 11)
                       return 0xffffffff;
               x = (1 << dev) | (func << 8) | reg;
       } else
               x = tag | reg | 1;

       s = splhigh();

       out32rb(pc->pc_addr, x);
       DELAY(10);
       data = 0xffffffff;
       if (!badaddr(pc->pc_data, 4))
               data = in32rb(pc->pc_data);
       DELAY(10);
       out32rb(pc->pc_addr, 0);
       DELAY(10);

       splx(s);

       return data;
}

static void
bandit_conf_write(void *cookie, pcitag_t tag, int reg, pcireg_t data)
{
       pci_chipset_tag_t pc = cookie;
       int bus, dev, func, s;
       u_int32_t x;

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

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

       if (func > 7)
               panic("pci_conf_write: func > 7");

       if (bus == pc->pc_bus) {
               if (dev < 11)
                       panic("pci_conf_write: dev < 11");
               x = (1 << dev) | (func << 8) | reg;
       } else
               x = tag | reg | 1;

       s = splhigh();

       out32rb(pc->pc_addr, x);
       DELAY(10);
       out32rb(pc->pc_data, data);
       DELAY(10);
       out32rb(pc->pc_addr, 0);
       DELAY(10);

       splx(s);
}

/*
* XXX
* /chaos really hates writes to config space, so we just don't do them
*/
static void
chaos_conf_write(void *cookie, pcitag_t tag, int reg, pcireg_t data)
{
}

#define PCI_BANDIT              11

#define PCI_REG_MODE_SELECT     0x50

#define PCI_MODE_IO_COHERENT    0x040   /* I/O coherent */

static void
bandit_init(struct bandit_softc *sc)
{
       pci_chipset_tag_t pc = &sc->sc_pc;
       pcitag_t tag;
       u_int mode;

       tag = pci_make_tag(pc, pc->pc_bus, PCI_BANDIT, 0);
       if ((pci_conf_read(pc, tag, PCI_ID_REG) & 0xffff) == 0xffff)
               return;

       mode = pci_conf_read(pc, tag, PCI_REG_MODE_SELECT);

       if ((mode & PCI_MODE_IO_COHERENT) == 0) {
               mode |= PCI_MODE_IO_COHERENT;
               pci_conf_write(pc, tag, PCI_REG_MODE_SELECT, mode);
       }
}

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