/*      $NetBSD: prep_pciconf_direct.c,v 1.10 2016/10/19 00:08:42 nonaka Exp $  */

/*
 * Copyright (c) 2002 Klaus J. Klein.  All rights reserved.
 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1994 Charles M. Hannum.  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 Charles M. Hannum.
 * 4. 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.
 */

/*
 * Machine-specific functions for PCI autoconfiguration.
 *
 * This version is specific to the direct-mapped configuration space access
 * such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.10 2016/10/19 00:08:42 nonaka Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>

#include <uvm/uvm_extern.h>

#define _POWERPC_BUS_DMA_PRIVATE
#include <sys/bus.h>
#include <machine/intr.h>
#include <machine/platform.h>

#include <powerpc/pio.h>

#include <dev/isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>

#include <prop/proplib.h>

#ifdef DEBUG
#define        DPRINTF(x) aprint_debug x
#else
#define        DPRINTF(x)
#endif

/* Physical base address and size of PCI configuration space. */
#define PCI_DCONF_BASE          0x80800000
#define PCI_DCONF_SIZE          0x00800000
/* Device function selection. */
#define PCI_DCONF_FUNC          0x00000700
#define PCI_DCONF_FUNC_SHIFT    8
/* Configuration space register selection. */
#define PCI_DCONF_REG           0x000000ff
#define PCI_DCONF_REG_SHIFT     0
/* Device selection; those bits still available. */
#define PCI_DCONF_DEV  \
    (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG))

void prep_pci_direct_attach_hook(device_t, device_t,
    struct pcibus_attach_args *);
pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t);
void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *);

void
prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)
{

        pc->pc_conf_v = NULL;

        pc->pc_attach_hook = prep_pci_direct_attach_hook;
        pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
        pc->pc_make_tag = prep_pci_direct_make_tag;
        pc->pc_conf_read = prep_pci_direct_conf_read;
        pc->pc_conf_write = prep_pci_direct_conf_write;

        pc->pc_intr_v = NULL;

        pc->pc_intr_map = prep_pci_intr_map;
        pc->pc_intr_string = genppc_pci_intr_string;
        pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
        pc->pc_intr_establish = genppc_pci_intr_establish;
        pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
        pc->pc_intr_setattr = genppc_pci_intr_setattr;
        pc->pc_intr_type = genppc_pci_intr_type;
        pc->pc_intr_alloc = genppc_pci_intr_alloc;
        pc->pc_intr_release = genppc_pci_intr_release;
        pc->pc_intx_alloc = genppc_pci_intx_alloc;

        pc->pc_msi_v = NULL;
        genppc_pci_chipset_msi_init(pc);

        pc->pc_msix_v = NULL;
        genppc_pci_chipset_msix_init(pc);

        pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
        pc->pc_decompose_tag = prep_pci_direct_decompose_tag;
        pc->pc_conf_hook = prep_pci_conf_hook;
}

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

        if (pba->pba_bus == 0)
                aprint_normal(": direct-mapped configuration space access");
}

pcitag_t
prep_pci_direct_make_tag(void *v, int bus, int device, int function)
{
        pcitag_t tag;

        if (bus >= 256 || device >= 32 || function >= 8)
                panic("prep_pci_direct_make_tag: bad request");

        tag = (bus << 16) | (device << 11) | (function << 8);

        return tag;
}

void
prep_pci_direct_decompose_tag(void *v, 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;
        return;
}

pcireg_t
prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg)
{
        pcireg_t data;
        int bus, device, function;
        int s;

        if ((unsigned int)reg >= PCI_CONF_SIZE)
                return (pcireg_t) ~0;

        prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);

        if (bus == 0) {
                /* Check if device selector is within selector range. */
                if (1 << device & ~PCI_DCONF_DEV) {
                        data = ~0;
                        goto out;
                }
                tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
        }

        s = splhigh();
        data = in32rb(PCI_DCONF_BASE | tag | reg);
        splx(s);

out:
        return data;
}

void
prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
{
        int bus, device, function;
        int s;

        DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ",
            (unsigned long)v, tag, reg, (unsigned long)data));

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

        prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);

        if (bus == 0) {
                /* Check if device selector is within selector range. */
                if (1 << device & ~PCI_DCONF_DEV) {
                        /* Should never happen. */
                        panic("prep_pci_direct_conf_write: bad device %d",
                            device);
                }
                tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
        }

        s = splhigh();
        out32rb(PCI_DCONF_BASE | tag | reg, data);
        splx(s);
}