/*      $NetBSD: vrpciu.c,v 1.24 2021/08/07 16:18:54 thorpej Exp $      */

/*-
 * Copyright (c) 2001 Enami Tsugutomo.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: vrpciu.c,v 1.24 2021/08/07 16:18:54 thorpej Exp $");

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

#include <machine/bus.h>
#include <machine/bus_space_hpcmips.h>
#include <machine/bus_dma_hpcmips.h>
#include <machine/config_hook.h>
#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pciidereg.h>

#include <hpcmips/vr/icureg.h>
#include <hpcmips/vr/vripif.h>
#include <hpcmips/vr/vrpciureg.h>

#include "pci.h"

#ifdef DEBUG
#define DPRINTF(args)   printf args
#else
#define DPRINTF(args)
#endif

struct vrpciu_softc {
        device_t sc_dev;

        vrip_chipset_tag_t sc_vc;
        bus_space_tag_t sc_iot;
        bus_space_handle_t sc_ioh;
        void *sc_ih;

        struct vrc4173bcu_softc *sc_bcu; /* vrc4173bcu */

        struct hpcmips_pci_chipset sc_pc;
};

static void     vrpciu_write(struct vrpciu_softc *, int, u_int32_t);
static u_int32_t
                vrpciu_read(struct vrpciu_softc *, int);
#ifdef DEBUG
static void     vrpciu_write_2(struct vrpciu_softc *, int, u_int16_t)
        __attribute__((unused));
static u_int16_t
                vrpciu_read_2(struct vrpciu_softc *, int);
#endif
static int      vrpciu_match(device_t, cfdata_t, void *);
static void     vrpciu_attach(device_t, device_t, void *);
static int      vrpciu_intr(void *);
static void     vrpciu_attach_hook(device_t, device_t,
                    struct pcibus_attach_args *);
static int      vrpciu_bus_maxdevs(pci_chipset_tag_t, int);
static int      vrpciu_bus_devorder(pci_chipset_tag_t, int, uint8_t *, int);
static pcitag_t vrpciu_make_tag(pci_chipset_tag_t, int, int, int);
static void     vrpciu_decompose_tag(pci_chipset_tag_t, pcitag_t, int *, int *,
                    int *);
static pcireg_t vrpciu_conf_read(pci_chipset_tag_t, pcitag_t, int); 
static void     vrpciu_conf_write(pci_chipset_tag_t, pcitag_t, int, pcireg_t);
static int      vrpciu_intr_map(const struct pci_attach_args *, pci_intr_handle_t *);
static const char *vrpciu_intr_string(pci_chipset_tag_t, pci_intr_handle_t,
                    char *, size_t);
static const struct evcnt *vrpciu_intr_evcnt(pci_chipset_tag_t,
                    pci_intr_handle_t);
static void     *vrpciu_intr_establish(pci_chipset_tag_t, pci_intr_handle_t,
                    int, int (*)(void *), void *);
static void     vrpciu_intr_disestablish(pci_chipset_tag_t, void *);

CFATTACH_DECL_NEW(vrpciu, sizeof(struct vrpciu_softc),
    vrpciu_match, vrpciu_attach, NULL, NULL);

static void
vrpciu_write(struct vrpciu_softc *sc, int offset, u_int32_t val)
{

        bus_space_write_4(sc->sc_iot, sc->sc_ioh, offset, val);
}

static u_int32_t
vrpciu_read(struct vrpciu_softc *sc, int offset)
{

        return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, offset));
}

#ifdef DEBUG
static void
vrpciu_write_2(struct vrpciu_softc *sc, int offset, u_int16_t val)
{

        bus_space_write_2(sc->sc_iot, sc->sc_ioh, offset, val);
}

static u_int16_t
vrpciu_read_2(struct vrpciu_softc *sc, int offset)
{

        return (bus_space_read_2(sc->sc_iot, sc->sc_ioh, offset));
}
#endif

static int
vrpciu_match(device_t parent, cfdata_t match, void *aux)
{

        return (1);
}

static void
vrpciu_attach(device_t parent, device_t self, void *aux)
{
        struct vrpciu_softc *sc = device_private(self);
        pci_chipset_tag_t pc = &sc->sc_pc;
        struct vrip_attach_args *va = aux;
#if defined(DEBUG) || NPCI > 0
        u_int32_t reg;
#endif
#if NPCI > 0
        struct bus_space_tag_hpcmips *iot;
        char tmpbuf[16];
        struct pcibus_attach_args pba;
#endif

        sc->sc_dev = self;
        sc->sc_vc = va->va_vc;
        sc->sc_iot = va->va_iot;
        if (bus_space_map(sc->sc_iot, va->va_addr, va->va_size, 0,
            &sc->sc_ioh)) {
                printf(": couldn't map io space\n");
                return;
        }

        sc->sc_ih = vrip_intr_establish(va->va_vc, va->va_unit, 0, IPL_TTY,
            vrpciu_intr, sc);
        if (sc->sc_ih == NULL) {
                printf(": couldn't establish interrupt\n");
                return;
        }

        /* Enable level 2 interrupt */
        vrip_intr_setmask2(va->va_vc, sc->sc_ih, PCIINT_INT0, 1);

        printf("\n");

#ifdef DEBUG
#define DUMP_MAW(sc, name, reg) do {                                    \
        printf("%s: %s =\t0x%08x\n", device_xname((sc)->sc_dev),        \
            (name), (reg));                                             \
        printf("%s:\tIBA/MASK =\t0x%08x/0x%08x (0x%08x - 0x%08x)\n",    \
            device_xname((sc)->sc_dev),                                 \
            reg & VRPCIU_MAW_IBAMASK, VRPCIU_MAW_ADDRMASK(reg),         \
            VRPCIU_MAW_ADDR(reg),                                       \
            VRPCIU_MAW_ADDR(reg) + VRPCIU_MAW_SIZE(reg));               \
        printf("%s:\tWINEN =\t0x%08x\n", device_xname((sc)->sc_dev),    \
            reg & VRPCIU_MAW_WINEN);                                    \
        printf("%s:\tPCIADR =\t0x%08x\n", device_xname((sc)->sc_dev),   \
            VRPCIU_MAW_PCIADDR(reg));                                   \
} while (0)
#define DUMP_TAW(sc, name, reg) do {                                    \
        printf("%s: %s =\t\t0x%08x\n", device_xname((sc)->sc_dev),      \
            (name), (reg));                                             \
        printf("%s:\tMASK =\t0x%08x\n", device_xname((sc)->sc_dev),     \
            VRPCIU_TAW_ADDRMASK(reg));                                  \
        printf("%s:\tWINEN =\t0x%08x\n", device_xname((sc)->sc_dev),    \
            reg & VRPCIU_TAW_WINEN);                                    \
        printf("%s:\tIBA =\t0x%08x\n", device_xname((sc)->sc_dev),      \
            VRPCIU_TAW_IBA(reg));                                       \
} while (0)
        reg = vrpciu_read(sc, VRPCIU_MMAW1REG);
        DUMP_MAW(sc, "MMAW1", reg);
        reg = vrpciu_read(sc, VRPCIU_MMAW2REG);
        DUMP_MAW(sc, "MMAW2", reg);
        reg = vrpciu_read(sc, VRPCIU_TAW1REG);
        DUMP_TAW(sc, "TAW1", reg);
        reg = vrpciu_read(sc, VRPCIU_TAW2REG);
        DUMP_TAW(sc, "TAW2", reg);
        reg = vrpciu_read(sc, VRPCIU_MIOAWREG);
        DUMP_MAW(sc, "MIOAW", reg);
        printf("%s: BUSERRAD =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_BUSERRADREG));
        printf("%s: INTCNTSTA =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_INTCNTSTAREG));
        printf("%s: EXACC =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_EXACCREG));
        printf("%s: RECONT =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_RECONTREG));
        printf("%s: PCIEN =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_ENREG));
        printf("%s: CLOCKSEL =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CLKSELREG));
        printf("%s: TRDYV =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_TRDYVREG));
        printf("%s: CLKRUN =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read_2(sc, VRPCIU_CLKRUNREG));
        printf("%s: IDREG =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_ID_REG));
        reg = vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_COMMAND_STATUS_REG);
        printf("%s: CSR =\t\t0x%08x\n", device_xname(sc->sc_dev), reg);
        vrpciu_write(sc, VRPCIU_CONF_BASE + PCI_COMMAND_STATUS_REG, reg);
        printf("%s: CSR =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_COMMAND_STATUS_REG));
        printf("%s: CLASS =\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_CLASS_REG));
        printf("%s: BHLC =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_BHLC_REG));
        printf("%s: MAIL =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + VRPCIU_CONF_MAILREG));
        printf("%s: MBA1 =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + VRPCIU_CONF_MBA1REG));
        printf("%s: MBA2 =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + VRPCIU_CONF_MBA2REG));
        printf("%s: INTR =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_INTERRUPT_REG));
#if 0
        vrpciu_write(sc, VRPCIU_CONF_BASE + PCI_INTERRUPT_REG,
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_INTERRUPT_REG) | 0x01);
        printf("%s: INTR =\t\t0x%08x\n", device_xname(sc->sc_dev),
            vrpciu_read(sc, VRPCIU_CONF_BASE + PCI_INTERRUPT_REG));
#endif
#endif

        pc->pc_dev = sc->sc_dev;
        pc->pc_attach_hook = vrpciu_attach_hook;
        pc->pc_bus_maxdevs = vrpciu_bus_maxdevs;
        pc->pc_bus_devorder = vrpciu_bus_devorder;
        pc->pc_make_tag = vrpciu_make_tag;
        pc->pc_decompose_tag = vrpciu_decompose_tag;
        pc->pc_conf_read = vrpciu_conf_read;
        pc->pc_conf_write = vrpciu_conf_write;
        pc->pc_intr_map = vrpciu_intr_map;
        pc->pc_intr_string = vrpciu_intr_string;
        pc->pc_intr_evcnt = vrpciu_intr_evcnt;
        pc->pc_intr_establish = vrpciu_intr_establish;
        pc->pc_intr_disestablish = vrpciu_intr_disestablish;

#if 0
        {
                int i;

                for (i = 0; i < 8; i++)
                        printf("%s: ID_REG(0, 0, %d) = 0x%08x\n",
                            device_xname(sc->sc_dev), i,
                            pci_conf_read(pc, pci_make_tag(pc, 0, 0, i),
                                PCI_ID_REG));
        }
#endif

#if NPCI > 0
        memset(&pba, 0, sizeof(pba));

        /* For now, just inherit window mappings set by WinCE.  XXX. */

        iot = hpcmips_alloc_bus_space_tag();
        reg = vrpciu_read(sc, VRPCIU_MIOAWREG);
        snprintf(tmpbuf, sizeof(tmpbuf), "%s/iot",
            device_xname(sc->sc_dev));
        hpcmips_init_bus_space(iot, (struct bus_space_tag_hpcmips *)sc->sc_iot,
            tmpbuf, VRPCIU_MAW_ADDR(reg), VRPCIU_MAW_SIZE(reg));
        pba.pba_iot = &iot->bst;

        /*
         * Just use system bus space tag.  It works since WinCE maps
         * PCI bus space at same offset.  But this isn't right thing
         * of course.  XXX.
         */
        pba.pba_memt = sc->sc_iot;
        pba.pba_dmat = &hpcmips_default_bus_dma_tag.bdt;
        pba.pba_dmat64 = NULL;
        pba.pba_bus = 0;
        pba.pba_bridgetag = NULL;

        if (platid_match(&platid, &platid_mask_MACH_LASER5_L_BOARD)) {
                /*
                 * fix PCI device configuration for L-Router.
                 */
                /* change IDE controller to native mode */
                reg = pci_conf_read(pc, pci_make_tag(pc, 0, 16, 0),
                                    PCI_CLASS_REG);
                reg |= PCIIDE_INTERFACE_PCI(0) << PCI_INTERFACE_SHIFT;
                reg |= PCIIDE_INTERFACE_PCI(1) << PCI_INTERFACE_SHIFT;
                pci_conf_write(pc, pci_make_tag(pc, 0, 16, 0), PCI_CLASS_REG,
                               reg);
                /* fix broken BAR setting of fxp0, fxp1 */
                pci_conf_write(pc, pci_make_tag(pc, 0, 0, 0), PCI_MAPREG_START,
                               0x11100000);
                pci_conf_write(pc, pci_make_tag(pc, 0, 1, 0), PCI_MAPREG_START,
                               0x11200000);
        }

        pba.pba_flags = PCI_FLAGS_IO_OKAY | PCI_FLAGS_MEM_OKAY |
            PCI_FLAGS_MRL_OKAY;
        pba.pba_pc = pc;

        config_found(self, &pba, pcibusprint, CFARGS_NONE);
#endif
}

/*
 * Handle PCI error interrupts.
 */
int
vrpciu_intr(void *arg)
{
        struct vrpciu_softc *sc = (struct vrpciu_softc *)arg;
        u_int32_t isr, baddr;

        isr = vrpciu_read(sc, VRPCIU_INTCNTSTAREG);
        baddr = vrpciu_read(sc, VRPCIU_BUSERRADREG);
        printf("%s: status=0x%08x  bad addr=0x%08x\n",
            device_xname(sc->sc_dev), isr, baddr);
        return ((isr & 0x0f) ? 1 : 0);
}

void
vrpciu_attach_hook(device_t parent, device_t self,
    struct pcibus_attach_args *pba)
{

        return;
}

int
vrpciu_bus_maxdevs(pci_chipset_tag_t pc, int busno)
{

        return (32);
}

int
vrpciu_bus_devorder(pci_chipset_tag_t pc, int busno, uint8_t *devs, int maxdevs)
{
        int dev, i, n;
        uint8_t *devn;
        char priorities[32];
        static pcireg_t ids[] = {
                /* these devices should be attached first */
                PCI_ID_CODE(PCI_VENDOR_NEC, PCI_PRODUCT_NEC_VRC4173_BCU),
        };

        n = MIN(32, maxdevs);
        if (n <= 0)
                return 0;

        devn = devs + n;

        /* scan PCI devices and check the id table */
        memset(priorities, 0, sizeof(priorities));
        for (dev = 0; dev < 32; dev++) {
                pcireg_t id;
                id = pci_conf_read(pc, pci_make_tag(pc, 0, dev, 0), PCI_ID_REG);
                for (i = 0; i < __arraycount(ids); i++)
                        if (id == ids[i])
                                priorities[dev] = 1;
        }

        /* fill order array */
        for (i = 1; 0 <= i; i--) {
                for (dev = 0; dev < 32; dev++) {
                        if (priorities[dev] == i && devs != devn)
                                *devs++ = dev;
                }
        }

        return n;
}

pcitag_t
vrpciu_make_tag(pci_chipset_tag_t pc, int bus, int device, int function)
{

        return ((bus << 16) | (device << 11) | (function << 8));
}

void
vrpciu_decompose_tag(pci_chipset_tag_t pc, 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) & 0x07;
}

pcireg_t
vrpciu_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
        struct vrpciu_softc *sc = device_private(pc->pc_dev);
        u_int32_t val;
        int bus, device, function;

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

        pci_decompose_tag(pc, tag, &bus, &device, &function);
        if (bus == 0) {
                if (device > 21)
                        return ((pcitag_t)-1);
                tag = (1 << (device + 11)) | (function << 8); /* Type 0 */
        } else
                tag |= VRPCIU_CONF_TYPE1;

        vrpciu_write(sc, VRPCIU_CONFAREG, tag | reg);
        val = vrpciu_read(sc, VRPCIU_CONFDREG);
#if 0
        printf("%s: conf_read: tag = 0x%08x, reg = 0x%x, val = 0x%08x\n",
            device_xname(sc->sc_dev), (u_int32_t)tag, reg, val);
#endif
        return (val);
}

void
vrpciu_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg,
    pcireg_t data)
{
        struct vrpciu_softc *sc = device_private(pc->pc_dev);
        int bus, device, function;

#if 0
        printf("%s: conf_write: tag = 0x%08x, reg = 0x%x, val = 0x%08x\n",
            device_xname(sc->sc_dev), (u_int32_t)tag, reg, (u_int32_t)data);
#endif

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

        vrpciu_decompose_tag(pc, tag, &bus, &device, &function);
        if (bus == 0) {
                if (device > 21)
                        return;
                tag = (1 << (device + 11)) | (function << 8); /* Type 0 */
        } else
                tag |= VRPCIU_CONF_TYPE1;

        vrpciu_write(sc, VRPCIU_CONFAREG, tag | reg);
        vrpciu_write(sc, VRPCIU_CONFDREG, data);
}

int
vrpciu_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
        pci_chipset_tag_t pc = pa->pa_pc;
        pcitag_t intrtag = pa->pa_intrtag;
        int bus, dev, func;
#ifdef DEBUG
        int line = pa->pa_intrline;
        int pin = pa->pa_intrpin;
#endif

        pci_decompose_tag(pc, intrtag, &bus, &dev, &func);
        DPRINTF(("%s(%d, %d, %d): line = %d, pin = %d\n", device_xname(pc->pc_dev),
            bus, dev, func, line, pin));

        *ihp = CONFIG_HOOK_PCIINTR_ID(bus, dev, func);

        return (0);
}

const char *
vrpciu_intr_string(pci_chipset_tag_t pc, pci_intr_handle_t ih, char *buf,
    size_t len)
{
        snprintf(buf, len, "pciintr %d:%d:%d",
            CONFIG_HOOK_PCIINTR_BUS((int)ih),
            CONFIG_HOOK_PCIINTR_DEVICE((int)ih),
            CONFIG_HOOK_PCIINTR_FUNCTION((int)ih));

        return buf;
}

const struct evcnt *
vrpciu_intr_evcnt(pci_chipset_tag_t pc, pci_intr_handle_t ih)
{

        /* XXX for now, no evcnt parent reported */

        return (NULL);
}

void *
vrpciu_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, int level,
    int (*func)(void *), void *arg)
{

        if (ih == -1)
                return (NULL);
        DPRINTF(("vrpciu_intr_establish: %lx\n", ih));

        return (config_hook(CONFIG_HOOK_PCIINTR, ih, CONFIG_HOOK_EXCLUSIVE,
            (int (*)(void *, int, long, void *))func, arg));
}

void
vrpciu_intr_disestablish(pci_chipset_tag_t pc, void *cookie)
{

        DPRINTF(("vrpciu_intr_disestablish: %p\n", cookie));
        config_unhook(cookie);
}