/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2000,2001 Jonathan Chen.  All rights reserved.
 * Copyright (c) 2003-2008 M. Warner Losh <imp@FreeBSD.org>
 *
 * 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 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 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>
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>

#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>

#include <sys/pciio.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pci_private.h>

#include <dev/cardbus/cardbusreg.h>
#include <dev/cardbus/cardbusvar.h>
#include <dev/cardbus/cardbus_cis.h>
#include <dev/pccard/pccard_cis.h>
#include <dev/pccard/pccardvar.h>

#include "power_if.h"
#include "pcib_if.h"

/* sysctl vars */
static SYSCTL_NODE(_hw, OID_AUTO, cardbus, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "CardBus parameters");

int    cardbus_debug = 0;
SYSCTL_INT(_hw_cardbus, OID_AUTO, debug, CTLFLAG_RWTUN,
    &cardbus_debug, 0, "CardBus debug");

int    cardbus_cis_debug = 0;
SYSCTL_INT(_hw_cardbus, OID_AUTO, cis_debug, CTLFLAG_RWTUN,
    &cardbus_cis_debug, 0, "CardBus CIS debug");

#define	DPRINTF(a) if (cardbus_debug) printf a
#define	DEVPRINTF(x) if (cardbus_debug) device_printf x

static int	cardbus_attach(device_t cbdev);
static int	cardbus_attach_card(device_t cbdev);
static int	cardbus_detach(device_t cbdev);
static int	cardbus_detach_card(device_t cbdev);
static void	cardbus_device_setup_regs(pcicfgregs *cfg);
static void	cardbus_driver_added(device_t cbdev, driver_t *driver);
static int	cardbus_probe(device_t cbdev);
static int	cardbus_read_ivar(device_t cbdev, device_t child, int which,
		    uintptr_t *result);

/************************************************************************/
/* Probe/Attach								*/
/************************************************************************/

static int
cardbus_probe(device_t cbdev)
{
	device_set_desc(cbdev, "CardBus bus");
	return (0);
}

static int
cardbus_attach(device_t cbdev)
{
	struct cardbus_softc *sc;
#ifdef PCI_RES_BUS
	int rid;
#endif

	sc = device_get_softc(cbdev);
	sc->sc_dev = cbdev;
#ifdef PCI_RES_BUS
	rid = 0;
	sc->sc_bus = bus_alloc_resource(cbdev, PCI_RES_BUS, &rid,
	    pcib_get_bus(cbdev), pcib_get_bus(cbdev), 1, 0);
	if (sc->sc_bus == NULL) {
		device_printf(cbdev, "failed to allocate bus number\n");
		return (ENXIO);
	}
#else
	device_printf(cbdev, "Your bus numbers may be AFU\n");
#endif
	return (0);
}

static int
cardbus_detach(device_t cbdev)
{
#ifdef PCI_RES_BUS
	struct cardbus_softc *sc;
#endif

	cardbus_detach_card(cbdev);
#ifdef PCI_RES_BUS
	sc = device_get_softc(cbdev);
	device_printf(cbdev, "Freeing up the allocatd bus\n");
	(void)bus_release_resource(cbdev, PCI_RES_BUS, 0, sc->sc_bus);
#endif
	return (0);
}

static int
cardbus_suspend(device_t self)
{

	cardbus_detach_card(self);
	return (0);
}

static int
cardbus_resume(device_t self)
{

	return (0);
}

/************************************************************************/
/* Attach/Detach card							*/
/************************************************************************/

static void
cardbus_device_setup_regs(pcicfgregs *cfg)
{
	device_t dev = cfg->dev;
	int i;

	/*
	 * Some cards power up with garbage in their BARs.  This
	 * code clears all that junk out.
	 */
	for (i = 0; i < PCIR_MAX_BAR_0; i++)
		pci_write_config(dev, PCIR_BAR(i), 0, 4);

	cfg->intline =
	    pci_get_irq(device_get_parent(device_get_parent(dev)));
	pci_write_config(dev, PCIR_INTLINE, cfg->intline, 1);
	pci_write_config(dev, PCIR_CACHELNSZ, 0x08, 1);
	pci_write_config(dev, PCIR_LATTIMER, 0xa8, 1);
	pci_write_config(dev, PCIR_MINGNT, 0x14, 1);
	pci_write_config(dev, PCIR_MAXLAT, 0x14, 1);
}

static struct pci_devinfo *
cardbus_alloc_devinfo(device_t dev)
{
	struct cardbus_devinfo *dinfo;

	dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
	return (&dinfo->pci);
}

static int
cardbus_attach_card(device_t cbdev)
{
	device_t brdev = device_get_parent(cbdev);
	device_t child;
	int bus, domain, slot, func;
	int cardattached = 0;
	int cardbusfunchigh = 0;
	struct cardbus_softc *sc;

	sc = device_get_softc(cbdev);
	cardbus_detach_card(cbdev); /* detach existing cards */
	POWER_DISABLE_SOCKET(brdev, cbdev); /* Turn the socket off first */
	POWER_ENABLE_SOCKET(brdev, cbdev);
	domain = pcib_get_domain(cbdev);
	bus = pcib_get_bus(cbdev);
	slot = 0;
	bus_topo_lock();
	/* For each function, set it up and try to attach a driver to it */
	for (func = 0; func <= cardbusfunchigh; func++) {
		struct cardbus_devinfo *dinfo;

		dinfo = (struct cardbus_devinfo *)
		    pci_read_device(brdev, cbdev, domain, bus, slot, func);
		if (dinfo == NULL)
			continue;
		if (dinfo->pci.cfg.mfdev)
			cardbusfunchigh = PCI_FUNCMAX;

		child = device_add_child(cbdev, NULL, -1);
		if (child == NULL) {
			DEVPRINTF((cbdev, "Cannot add child!\n"));
			pci_freecfg((struct pci_devinfo *)dinfo);
			continue;
		}
		dinfo->pci.cfg.dev = child;
		resource_list_init(&dinfo->pci.resources);
		device_set_ivars(child, dinfo);
		cardbus_device_create(sc, dinfo, cbdev, child);
		if (cardbus_do_cis(cbdev, child) != 0)
			DEVPRINTF((cbdev, "Warning: Bogus CIS ignored\n"));
		pci_cfg_save(dinfo->pci.cfg.dev, &dinfo->pci, 0);
		pci_cfg_restore(dinfo->pci.cfg.dev, &dinfo->pci);
		cardbus_device_setup_regs(&dinfo->pci.cfg);
		pci_add_resources(cbdev, child, 1, dinfo->mprefetchable);
		pci_print_verbose(&dinfo->pci);
		if (device_probe_and_attach(child) == 0)
			cardattached++;
		else
			pci_cfg_save(dinfo->pci.cfg.dev, &dinfo->pci, 1);
	}
	bus_topo_unlock();
	if (cardattached > 0)
		return (0);
/*	POWER_DISABLE_SOCKET(brdev, cbdev); */
	return (ENOENT);
}

static void
cardbus_child_deleted(device_t cbdev, device_t child)
{
	struct cardbus_devinfo *dinfo = device_get_ivars(child);

	if (dinfo->pci.cfg.dev != child)
		device_printf(cbdev, "devinfo dev mismatch\n");
	cardbus_device_destroy(dinfo);
	pci_child_deleted(cbdev, child);
}

static int
cardbus_detach_card(device_t cbdev)
{
	int err = 0;

	bus_topo_lock();
	err = bus_generic_detach(cbdev);
	if (err == 0)
		err = device_delete_children(cbdev);
	bus_topo_unlock();
	if (err)
		return (err);

	POWER_DISABLE_SOCKET(device_get_parent(cbdev), cbdev);
	return (err);
}

static void
cardbus_driver_added(device_t cbdev, driver_t *driver)
{
	int numdevs;
	device_t *devlist;
	device_t dev;
	int i;
	struct cardbus_devinfo *dinfo;

	DEVICE_IDENTIFY(driver, cbdev);
	if (device_get_children(cbdev, &devlist, &numdevs) != 0)
		return;

	/*
	 * If there are no drivers attached, but there are children,
	 * then power the card up.
	 */
	for (i = 0; i < numdevs; i++) {
		dev = devlist[i];
		if (device_get_state(dev) != DS_NOTPRESENT)
		    break;
	}
	if (i > 0 && i == numdevs)
		POWER_ENABLE_SOCKET(device_get_parent(cbdev), cbdev);
	for (i = 0; i < numdevs; i++) {
		dev = devlist[i];
		if (device_get_state(dev) != DS_NOTPRESENT)
			continue;
		dinfo = device_get_ivars(dev);
		pci_print_verbose(&dinfo->pci);
		if (bootverbose)
			printf("pci%d:%d:%d:%d: reprobing on driver added\n",
			    dinfo->pci.cfg.domain, dinfo->pci.cfg.bus,
			    dinfo->pci.cfg.slot, dinfo->pci.cfg.func);
		pci_cfg_restore(dinfo->pci.cfg.dev, &dinfo->pci);
		if (device_probe_and_attach(dev) != 0)
			pci_cfg_save(dev, &dinfo->pci, 1);
	}
	free(devlist, M_TEMP);
}

/************************************************************************/
/* Other Bus Methods							*/
/************************************************************************/

static int
cardbus_read_ivar(device_t cbdev, device_t child, int which, uintptr_t *result)
{
	struct cardbus_devinfo *dinfo;
	pcicfgregs *cfg;

	dinfo = device_get_ivars(child);
	cfg = &dinfo->pci.cfg;

	switch (which) {
	case PCI_IVAR_ETHADDR:
		/*
		 * The generic accessor doesn't deal with failure, so
		 * we set the return value, then return an error.
		 */
		if (dinfo->fepresent & (1 << PCCARD_TPLFE_TYPE_LAN_NID)) {
			*((uint8_t **) result) = dinfo->funce.lan.nid;
			break;
		}
		*((uint8_t **) result) = NULL;
		return (EINVAL);
	default:
		return (pci_read_ivar(cbdev, child, which, result));
	}
	return 0;
}

static device_method_t cardbus_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		cardbus_probe),
	DEVMETHOD(device_attach,	cardbus_attach),
	DEVMETHOD(device_detach,	cardbus_detach),
	DEVMETHOD(device_suspend,	cardbus_suspend),
	DEVMETHOD(device_resume,	cardbus_resume),

	/* Bus interface */
	DEVMETHOD(bus_child_deleted,	cardbus_child_deleted),
	DEVMETHOD(bus_get_dma_tag,	bus_generic_get_dma_tag),
	DEVMETHOD(bus_read_ivar,	cardbus_read_ivar),
	DEVMETHOD(bus_driver_added,	cardbus_driver_added),
	DEVMETHOD(bus_rescan,		bus_null_rescan),

	/* Card Interface */
	DEVMETHOD(card_attach_card,	cardbus_attach_card),
	DEVMETHOD(card_detach_card,	cardbus_detach_card),

	/* PCI interface */
	DEVMETHOD(pci_alloc_devinfo,	cardbus_alloc_devinfo),
	{0,0}
};

DEFINE_CLASS_1(cardbus, cardbus_driver, cardbus_methods,
    sizeof(struct cardbus_softc), pci_driver);

static devclass_t cardbus_devclass;

DRIVER_MODULE(cardbus, cbb, cardbus_driver, cardbus_devclass, 0, 0);
MODULE_VERSION(cardbus, 1);