/*      $NetBSD: ifpga_pci.c,v 1.26 2023/12/20 13:55:17 thorpej Exp $   */

/*
 * Copyright (c) 2001 ARM Ltd
 * 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 company 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 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.
 *
 * Copyright (c) 1997,1998 Mark Brinicombe.
 * Copyright (c) 1997,1998 Causality Limited
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Mark Brinicombe
 *      for the NetBSD Project.
 * 4. The name of the company nor the name of the author may 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 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.
 */

#define _ARM32_BUS_DMA_PRIVATE

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ifpga_pci.c,v 1.26 2023/12/20 13:55:17 thorpej Exp $");

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

#include <evbarm/integrator/int_bus_dma.h>

#include <machine/intr.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include <evbarm/ifpga/ifpgareg.h>
#include <evbarm/ifpga/ifpgamem.h>
#include <evbarm/ifpga/ifpga_pcivar.h>
#include <evbarm/dev/v360reg.h>


void            ifpga_pci_attach_hook (device_t, device_t,
                    struct pcibus_attach_args *);
int             ifpga_pci_bus_maxdevs (void *, int);
pcitag_t        ifpga_pci_make_tag (void *, int, int, int);
void            ifpga_pci_decompose_tag (void *, pcitag_t, int *, int *,
                    int *);
pcireg_t        ifpga_pci_conf_read (void *, pcitag_t, int);
void            ifpga_pci_conf_write (void *, pcitag_t, int, pcireg_t);
int             ifpga_pci_intr_map (const struct pci_attach_args *,
                    pci_intr_handle_t *);
const char      *ifpga_pci_intr_string (void *, pci_intr_handle_t, char *, size_t);
const struct evcnt *ifpga_pci_intr_evcnt (void *, pci_intr_handle_t);
void            *ifpga_pci_intr_establish (void *, pci_intr_handle_t, int,
                    int (*)(void *), void *, const char *);
void            ifpga_pci_intr_disestablish (void *, void *);

struct arm32_pci_chipset ifpga_pci_chipset = {
        .pc_attach_hook = ifpga_pci_attach_hook,
        .pc_bus_maxdevs = ifpga_pci_bus_maxdevs,
        .pc_make_tag = ifpga_pci_make_tag,
        .pc_decompose_tag = ifpga_pci_decompose_tag,
        .pc_conf_read = ifpga_pci_conf_read,
        .pc_conf_write = ifpga_pci_conf_write,
        .pc_intr_map = ifpga_pci_intr_map,
        .pc_intr_string = ifpga_pci_intr_string,
        .pc_intr_evcnt = ifpga_pci_intr_evcnt,
        .pc_intr_establish = ifpga_pci_intr_establish,
        .pc_intr_disestablish = ifpga_pci_intr_disestablish,
        .pc_conf_interrupt = ifpga_pci_conf_interrupt,
};

/*
 * Use the integrator-specific bus_dma routines.
 */
struct arm32_bus_dma_tag ifpga_pci_bus_dma_tag = {
        0,
        0,
        NULL,
        _bus_dmamap_create, 
        _bus_dmamap_destroy,
        _bus_dmamap_load,
        _bus_dmamap_load_mbuf,
        _bus_dmamap_load_uio,
        _bus_dmamap_load_raw,
        _bus_dmamap_unload,
        _bus_dmamap_sync,       /* pre */
        NULL,                   /* post */
        _bus_dmamem_alloc,
        _bus_dmamem_free,
        _bus_dmamem_map,
        _bus_dmamem_unmap,
        _bus_dmamem_mmap,
};

/*
 * Currently we only support 12 devices as we select directly in the
 * type 0 config cycle
 * (See conf_{read,write} for more detail
 */
#define MAX_PCI_DEVICES 21

/*static int
pci_intr(void *arg)
{
        printf("pci int %x\n", (int)arg);
        return 0;
}*/


void
ifpga_pci_attach_hook(device_t parent, device_t self,
    struct pcibus_attach_args *pba)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_attach_hook()\n");
#endif
}

int
ifpga_pci_bus_maxdevs(void *pcv, int busno)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_bus_maxdevs(pcv=%p, busno=%d)\n", pcv, busno);
#endif
        return MAX_PCI_DEVICES;
}

pcitag_t
ifpga_pci_make_tag(void *pcv, int bus, int device, int function)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_make_tag(pcv=%p, bus=%d, device=%d, function=%d)\n",
            pcv, bus, device, function);
#endif
        return (bus << 16) | (device << 11) | (function << 8);
}

void
ifpga_pci_decompose_tag(void *pcv, pcitag_t tag, int *busp, int *devicep,
    int *functionp)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_decompose_tag(pcv=%p, tag=0x%08lx, bp=%p, dp=%p, "
            "fp=%p)\n", pcv, tag, busp, devicep, functionp);
#endif

        if (busp != NULL)
                *busp = (tag >> 16) & 0xff;
        if (devicep != NULL)
                *devicep = (tag >> 11) & 0x1f;
        if (functionp != NULL)
                *functionp = (tag >> 8) & 0x7;
}

pcireg_t
ifpga_pci_conf_read(void *pcv, pcitag_t tag, int reg)
{
        pcireg_t data;
        struct ifpga_pci_softc *sc = (struct ifpga_pci_softc *)pcv;
        int bus, device, function;
        u_int address;

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

        ifpga_pci_decompose_tag(pcv, tag, &bus, &device, &function);

        /* Reset the appertures so that we can talk to the register space.  */
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE0,
            IFPGA_PCI_APP0_512MB_BASE);
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE1,
            IFPGA_PCI_APP1_CONF_BASE);

        if (bus == 0) {
                address = (1 << (device + 11)) | reg;
                bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
                    IFPGA_PCI_APP1_CONF_T0_MAP | ((address >> 16) & 0xff00));

                /* Read the value from the bus...  */
                data = bus_space_read_4(sc->sc_iot, sc->sc_conf_ioh,
                    address & 0x00ffffff);

        } else {
                bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
                    IFPGA_PCI_APP1_CONF_T1_MAP);

                /* Read the value from the bus... */
                data = bus_space_read_4(sc->sc_iot, sc->sc_conf_ioh,
                    tag | reg);
        }
        /* ... and put the memory spaces back again.  */

        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE1,
            IFPGA_PCI_APP1_256MB_BASE);
        bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
            IFPGA_PCI_APP1_256MB_MAP);
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE0,
            IFPGA_PCI_APP0_256MB_BASE);
#ifdef PCI_DEBUG
        printf("ifpga_pci_conf_read(pcv=%p tag=0x%08lx reg=0x%02x)=0x%08x\n",
            pcv, tag, reg, data);
#endif
        return data;
}

void
ifpga_pci_conf_write(void *pcv, pcitag_t tag, int reg, pcireg_t data)
{
        struct ifpga_pci_softc *sc = (struct ifpga_pci_softc *)pcv;
        int bus, device, function;
        u_int address;

#ifdef PCI_DEBUG
        printf("ifpga_pci_conf_write(pcv=%p tag=0x%08lx reg=0x%02x, 0x%08x)\n",
            pcv, tag, reg, data);
#endif

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

        ifpga_pci_decompose_tag(pcv, tag, &bus, &device, &function);

        /* Reset the appertures so that we can talk to the register space.  */
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE0,
            IFPGA_PCI_APP0_512MB_BASE);
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE1,
            IFPGA_PCI_APP1_CONF_BASE);

        if (bus == 0) {
                address = (1 << (device + 11)) | reg;
                bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
                    IFPGA_PCI_APP1_CONF_T0_MAP | ((address >> 16) & 0xff00));

                /* Write the value to the bus...  */
                bus_space_write_4(sc->sc_iot, sc->sc_conf_ioh,
                    address & 0x00ffffff, data);

        } else {
                bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
                    IFPGA_PCI_APP1_CONF_T1_MAP);

                /* Write the value to the bus... */
                bus_space_write_4(sc->sc_iot, sc->sc_conf_ioh, tag | reg,
                    data);
        }
        /* ... and put the memory spaces back again.  */

        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE1,
            IFPGA_PCI_APP1_256MB_BASE);
        bus_space_write_2(sc->sc_memt, sc->sc_reg_ioh, V360_LB_MAP1,
            IFPGA_PCI_APP1_256MB_MAP);
        bus_space_write_4(sc->sc_memt, sc->sc_reg_ioh, V360_LB_BASE0,
            IFPGA_PCI_APP0_256MB_BASE);
}

int
ifpga_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
        int line = pa->pa_intrline;

#ifdef PCI_DEBUG
        int pin = pa->pa_intrpin;
        void *pcv = pa->pa_pc;
        pcitag_t intrtag = pa->pa_intrtag;
        int bus, device, function;

        ifpga_pci_decompose_tag(pcv, intrtag, &bus, &device, &function);
        printf("ifpga_pci_intr_map: pcv=%p, tag=%08lx pin=%d line=%d "
            "dev=%d\n", pcv, intrtag, pin, line, device);
#endif


#ifdef PCI_DEBUG
        printf("pin %d, line %d mapped to int %d\n", pin, line, line);
#endif

        *ihp = line;
        return 0;
}

const char *
ifpga_pci_intr_string(void *pcv, pci_intr_handle_t ih, char *buf, size_t len)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_intr_string(pcv=%p, ih=0x%" PRIu64 ")\n", pcv, ih);
#endif
        if (ih == 0)
                panic("ifpga_pci_intr_string: bogus handle 0x%" PRIu64, ih);

        snprintf(buf, len, "pciint%" PRIu64, ih - IFPGA_INTRNUM_PCIINT0);
        return buf;     
}

const struct evcnt *
ifpga_pci_intr_evcnt(void *pcv, pci_intr_handle_t ih)
{

        /* XXX for now, no evcnt parent reported */
        return NULL;
}

void *
ifpga_pci_intr_establish(void *pcv, pci_intr_handle_t ih, int level,
    int (*func) (void *), void *arg, const char *xname)
{
        void *intr;

#ifdef PCI_DEBUG
        printf("ifpga_pci_intr_establish(pcv=%p, ih=0x%" PRIu64 ", level=%d, "
            "func=%p, arg=%p, xname=%s)\n", pcv, ih, level, func, arg, xname);
#endif

        intr = ifpga_intr_establish(ih, level, func, arg);

        return intr;
}

void
ifpga_pci_intr_disestablish(void *pcv, void *cookie)
{
#ifdef PCI_DEBUG
        printf("ifpga_pci_intr_disestablish(pcv=%p, cookie=%p)\n",
            pcv, cookie);
#endif
        ifpga_intr_disestablish(cookie);
}