/*      $NetBSD: rumpdev_pci.c,v 1.5 2015/05/17 13:51:31 pooka Exp $    */

/*
* Copyright (c) 2013 Antti Kantee.  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 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rumpdev_pci.c,v 1.5 2015/05/17 13:51:31 pooka Exp $");

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/atomic.h>

#include <dev/pci/pcivar.h>

#include "pci_user.h"

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

       /* nada */
}

int
pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
{

       return 32;
}

pcitag_t
pci_make_tag(pci_chipset_tag_t pc, int bus, int device, int function)
{
       pcitag_t pt;
       int *tag;
       unsigned csr;
       int rv;

       CTASSERT(sizeof(pt) >= sizeof(int));

       /* a "bit" ugly, but keeps us MI */
       tag = (int *)&pt;
       *tag = (bus << 16) | (device << 8) | (function << 0);

       /*
        * On Xen, we need to enable the device io/mem space.
        * Doesn't really belong here, but we need to do it somewhere.
        */
       rv = rumpcomp_pci_confread(bus, device, function,
           PCI_COMMAND_STATUS_REG, &csr);
       if (rv == 0 && (csr & PCI_COMMAND_MEM_ENABLE) == 0) {
               rumpcomp_pci_confwrite(bus, device, function,
                   PCI_COMMAND_STATUS_REG, csr | PCI_COMMAND_MEM_ENABLE);
       }

       return pt;
}

pcireg_t
pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
       unsigned int rv;
       int bus, device, fun;

       pci_decompose_tag(pc, tag, &bus, &device, &fun);
       rumpcomp_pci_confread(bus, device, fun, reg, &rv);
       return rv;
}

void
pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
{
       int bus, device, fun;

       pci_decompose_tag(pc, tag, &bus, &device, &fun);
       rumpcomp_pci_confwrite(bus, device, fun, reg, data);
}

void
pci_decompose_tag(pci_chipset_tag_t pc, pcitag_t tag,
       int *bp, int *dp, int *fp)
{
       int *t = (int *)&tag;

       *bp = (*t >> 16) & 0xff;
       *dp = (*t >> 8)  & 0xff;
       *fp = (*t >> 0)  & 0xff;
}

/*
* Well, yay, deal with the wonders of weird_t.  We'll just
* assume it's an integral type (which, btw, isn't universally true).
* The hypercall will map "cookie" to its internal structure.
* Dial _t for a good time.
*/
int
pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ih)
{
       static unsigned int intrhandle;
       unsigned cookie;
       int rv;

       cookie = atomic_inc_uint_nv(&intrhandle);
       rv = rumpcomp_pci_irq_map(pa->pa_bus,
           pa->pa_device, pa->pa_function, pa->pa_intrline, cookie);
       if (rv == 0)
               *ih = cookie;
       return 0;
}

const char *
pci_intr_string(pci_chipset_tag_t pc, pci_intr_handle_t ih,
       char *buf, size_t buflen)
{

       snprintf(buf, buflen, "pausebreak");
       return buf;
}

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

       return rumpcomp_pci_irq_establish(ih, func, arg);
}

int
pci_intr_setattr(pci_chipset_tag_t pc, pci_intr_handle_t *ih,
       int attr, uint64_t data)
{

       switch (attr) {
       case PCI_INTR_MPSAFE:
               return 0;
       default:
               return ENODEV;
       }
}

void
pci_intr_disestablish(pci_chipset_tag_t pc, void *not_your_above_ih)
{

       panic("%s: unimplemented", __func__);
}

#ifdef __HAVE_PCIIDE_MACHDEP_COMPAT_INTR_ESTABLISH
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pciidereg.h>
#include <dev/pci/pciidevar.h>

void *
pciide_machdep_compat_intr_establish(device_t dev,
       const struct pci_attach_args *pa, int chan,
       int (*func)(void *), void *arg)
{
       pci_intr_handle_t ih;
       struct pci_attach_args mypa = *pa;

       mypa.pa_intrline = PCIIDE_COMPAT_IRQ(chan);
       if (pci_intr_map(&mypa, &ih) != 0)
               return NULL;
       return rumpcomp_pci_irq_establish(ih, func, arg);
}

__strong_alias(pciide_machdep_compat_intr_disestablish,pci_intr_disestablish);
#endif /* __HAVE_PCIIDE_MACHDEP_COMPAT_INTR_ESTABLISH */